#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <openssl/ocsp.h>
+#include <openssl/rand.h>
#include "ssl_locl.h"
const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT;
static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
const unsigned char *sess_id, int sesslen,
SSL_SESSION **psess);
+static int ssl_check_clienthello_tlsext_early(SSL *s);
+int ssl_check_serverhello_tlsext(SSL *s);
#endif
SSL3_ENC_METHOD TLSv1_enc_data={
TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
tls1_alert_code,
+ tls1_export_keying_material,
+ 0,
+ SSL3_HM_HEADER_LENGTH,
+ ssl3_set_handshake_header,
+ ssl3_handshake_write
+ };
+
+SSL3_ENC_METHOD TLSv1_1_enc_data={
+ tls1_enc,
+ tls1_mac,
+ tls1_setup_key_block,
+ tls1_generate_master_secret,
+ tls1_change_cipher_state,
+ tls1_final_finish_mac,
+ TLS1_FINISH_MAC_LENGTH,
+ tls1_cert_verify_mac,
+ TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
+ TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
+ tls1_alert_code,
+ tls1_export_keying_material,
+ SSL_ENC_FLAG_EXPLICIT_IV,
+ SSL3_HM_HEADER_LENGTH,
+ ssl3_set_handshake_header,
+ ssl3_handshake_write
+ };
+
+SSL3_ENC_METHOD TLSv1_2_enc_data={
+ tls1_enc,
+ tls1_mac,
+ tls1_setup_key_block,
+ tls1_generate_master_secret,
+ tls1_change_cipher_state,
+ tls1_final_finish_mac,
+ TLS1_FINISH_MAC_LENGTH,
+ tls1_cert_verify_mac,
+ TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
+ TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
+ tls1_alert_code,
+ tls1_export_keying_material,
+ SSL_ENC_FLAG_EXPLICIT_IV|SSL_ENC_FLAG_SIGALGS|SSL_ENC_FLAG_SHA256_PRF
+ |SSL_ENC_FLAG_TLS1_2_CIPHERS,
+ SSL3_HM_HEADER_LENGTH,
+ ssl3_set_handshake_header,
+ ssl3_handshake_write
};
long tls1_default_timeout(void)
void tls1_free(SSL *s)
{
+#ifndef OPENSSL_NO_TLSEXT
+ if (s->tlsext_session_ticket)
+ {
+ OPENSSL_free(s->tlsext_session_ticket);
+ }
+#endif /* OPENSSL_NO_TLSEXT */
ssl3_free(s);
}
void tls1_clear(SSL *s)
{
ssl3_clear(s);
- s->version=TLS1_VERSION;
+ s->version = s->method->version;
}
#ifndef OPENSSL_NO_EC
+
static int nid_list[] =
{
NID_sect163k1, /* sect163k1 (1) */
NID_secp256k1, /* secp256k1 (22) */
NID_X9_62_prime256v1, /* secp256r1 (23) */
NID_secp384r1, /* secp384r1 (24) */
- NID_secp521r1 /* secp521r1 (25) */
+ NID_secp521r1, /* secp521r1 (25) */
+ NID_brainpoolP256r1, /* brainpoolP256r1 (26) */
+ NID_brainpoolP384r1, /* brainpoolP384r1 (27) */
+ NID_brainpoolP512r1 /* brainpool512r1 (28) */
};
-
+
+
+static const unsigned char ecformats_default[] =
+ {
+ TLSEXT_ECPOINTFORMAT_uncompressed,
+ TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime,
+ TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2
+ };
+
+static const unsigned char eccurves_default[] =
+ {
+ 0,14, /* sect571r1 (14) */
+ 0,13, /* sect571k1 (13) */
+ 0,25, /* secp521r1 (25) */
+ 0,28, /* brainpool512r1 (28) */
+ 0,11, /* sect409k1 (11) */
+ 0,12, /* sect409r1 (12) */
+ 0,27, /* brainpoolP384r1 (27) */
+ 0,24, /* secp384r1 (24) */
+ 0,9, /* sect283k1 (9) */
+ 0,10, /* sect283r1 (10) */
+ 0,26, /* brainpoolP256r1 (26) */
+ 0,22, /* secp256k1 (22) */
+ 0,23, /* secp256r1 (23) */
+ 0,8, /* sect239k1 (8) */
+ 0,6, /* sect233k1 (6) */
+ 0,7, /* sect233r1 (7) */
+ 0,20, /* secp224k1 (20) */
+ 0,21, /* secp224r1 (21) */
+ 0,4, /* sect193r1 (4) */
+ 0,5, /* sect193r2 (5) */
+ 0,18, /* secp192k1 (18) */
+ 0,19, /* secp192r1 (19) */
+ 0,1, /* sect163k1 (1) */
+ 0,2, /* sect163r1 (2) */
+ 0,3, /* sect163r2 (3) */
+ 0,15, /* secp160k1 (15) */
+ 0,16, /* secp160r1 (16) */
+ 0,17, /* secp160r2 (17) */
+ };
+
+static const unsigned char suiteb_curves[] =
+ {
+ 0, TLSEXT_curve_P_256,
+ 0, TLSEXT_curve_P_384
+ };
+
int tls1_ec_curve_id2nid(int curve_id)
{
/* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
- if ((curve_id < 1) || (curve_id > sizeof(nid_list)/sizeof(nid_list[0]))) return 0;
+ if ((curve_id < 1) || ((unsigned int)curve_id >
+ sizeof(nid_list)/sizeof(nid_list[0])))
+ return 0;
return nid_list[curve_id-1];
}
return 24;
case NID_secp521r1: /* secp521r1 (25) */
return 25;
+ case NID_brainpoolP256r1: /* brainpoolP256r1 (26) */
+ return 26;
+ case NID_brainpoolP384r1: /* brainpoolP384r1 (27) */
+ return 27;
+ case NID_brainpoolP512r1: /* brainpool512r1 (28) */
+ return 28;
default:
return 0;
}
}
-#endif /* OPENSSL_NO_EC */
-
-#ifndef OPENSSL_NO_TLSEXT
-unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
+/* Get curves list, if "sess" is set return client curves otherwise
+ * preferred list
+ */
+static void tls1_get_curvelist(SSL *s, int sess,
+ const unsigned char **pcurves,
+ size_t *pcurveslen)
{
- int extdatalen=0;
- unsigned char *ret = p;
-
- ret+=2;
-
- if (ret>=limit) return NULL; /* this really never occurs, but ... */
+ if (sess)
+ {
+ *pcurves = s->session->tlsext_ellipticcurvelist;
+ *pcurveslen = s->session->tlsext_ellipticcurvelist_length;
+ return;
+ }
+ /* For Suite B mode only include P-256, P-384 */
+ switch (tls1_suiteb(s))
+ {
+ case SSL_CERT_FLAG_SUITEB_128_LOS:
+ *pcurves = suiteb_curves;
+ *pcurveslen = sizeof(suiteb_curves);
+ break;
- if (s->tlsext_hostname != NULL)
- {
- /* Add TLS extension servername to the Client Hello message */
- unsigned long size_str;
- long lenmax;
+ case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
+ *pcurves = suiteb_curves;
+ *pcurveslen = 2;
+ break;
- /* check for enough space.
- 4 for the servername type and entension length
- 2 for servernamelist length
- 1 for the hostname type
- 2 for hostname length
- + hostname length
- */
-
- if ((lenmax = limit - ret - 9) < 0
- || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
- return NULL;
-
- /* extension type and length */
- s2n(TLSEXT_TYPE_server_name,ret);
- s2n(size_str+5,ret);
-
- /* length of servername list */
- s2n(size_str+3,ret);
-
- /* hostname type, length and hostname */
- *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
- s2n(size_str,ret);
- memcpy(ret, s->tlsext_hostname, size_str);
- ret+=size_str;
+ case SSL_CERT_FLAG_SUITEB_192_LOS:
+ *pcurves = suiteb_curves + 2;
+ *pcurveslen = 2;
+ break;
+ default:
+ *pcurves = s->tlsext_ellipticcurvelist;
+ *pcurveslen = s->tlsext_ellipticcurvelist_length;
}
-
-#ifndef OPENSSL_NO_EC
- if (s->tlsext_ecpointformatlist != NULL)
+ if (!*pcurves)
{
- /* Add TLS extension ECPointFormats to the ClientHello message */
- long lenmax;
-
- if ((lenmax = limit - ret - 5) < 0) return NULL;
- if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
- if (s->tlsext_ecpointformatlist_length > 255)
- {
- SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
- return NULL;
- }
-
- s2n(TLSEXT_TYPE_ec_point_formats,ret);
- s2n(s->tlsext_ecpointformatlist_length + 1,ret);
- *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
- memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
- ret+=s->tlsext_ecpointformatlist_length;
+ *pcurves = eccurves_default;
+ *pcurveslen = sizeof(eccurves_default);
}
- if (s->tlsext_ellipticcurvelist != NULL)
+ }
+/* Check a curve is one of our preferences */
+int tls1_check_curve(SSL *s, const unsigned char *p, size_t len)
+ {
+ const unsigned char *curves;
+ size_t curveslen, i;
+ unsigned int suiteb_flags = tls1_suiteb(s);
+ if (len != 3 || p[0] != NAMED_CURVE_TYPE)
+ return 0;
+ /* Check curve matches Suite B preferences */
+ if (suiteb_flags)
{
- /* Add TLS extension EllipticCurves to the ClientHello message */
- long lenmax;
-
- if ((lenmax = limit - ret - 6) < 0) return NULL;
- if (s->tlsext_ellipticcurvelist_length > (unsigned long)lenmax) return NULL;
- if (s->tlsext_ellipticcurvelist_length > 65532)
+ unsigned long cid = s->s3->tmp.new_cipher->id;
+ if (p[1])
+ return 0;
+ if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
{
- SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
- return NULL;
+ if (p[2] != TLSEXT_curve_P_256)
+ return 0;
}
-
- s2n(TLSEXT_TYPE_elliptic_curves,ret);
- s2n(s->tlsext_ellipticcurvelist_length + 2, ret);
-
- /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
- * elliptic_curve_list, but the examples use two bytes.
- * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
- * resolves this to two bytes.
- */
- s2n(s->tlsext_ellipticcurvelist_length, ret);
- memcpy(ret, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length);
- ret+=s->tlsext_ellipticcurvelist_length;
- }
-#endif /* OPENSSL_NO_EC */
-
- if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
- {
- int ticklen;
- if (s->session && s->session->tlsext_tick)
- ticklen = s->session->tlsext_ticklen;
- else
- ticklen = 0;
- /* Check for enough room 2 for extension type, 2 for len
- * rest for ticket
- */
- if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
- s2n(TLSEXT_TYPE_session_ticket,ret);
- s2n(ticklen,ret);
- if (ticklen)
+ else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
{
- memcpy(ret, s->session->tlsext_tick, ticklen);
- ret += ticklen;
+ if (p[2] != TLSEXT_curve_P_384)
+ return 0;
}
+ else /* Should never happen */
+ return 0;
}
-
-#ifdef TLSEXT_TYPE_opaque_prf_input
- if (s->s3->client_opaque_prf_input != NULL)
+ tls1_get_curvelist(s, 0, &curves, &curveslen);
+ for (i = 0; i < curveslen; i += 2, curves += 2)
{
- size_t col = s->s3->client_opaque_prf_input_len;
-
- if ((long)(limit - ret - 6 - col < 0))
- return NULL;
- if (col > 0xFFFD) /* can't happen */
- return NULL;
-
- s2n(TLSEXT_TYPE_opaque_prf_input, ret);
- s2n(col + 2, ret);
- s2n(col, ret);
- memcpy(ret, s->s3->client_opaque_prf_input, col);
- ret += col;
+ if (p[1] == curves[0] && p[2] == curves[1])
+ return 1;
}
-#endif
-
- if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
- {
- int i;
- long extlen, idlen, itmp;
- OCSP_RESPID *id;
+ return 0;
+ }
- idlen = 0;
- for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
- {
- id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
- itmp = i2d_OCSP_RESPID(id, NULL);
- if (itmp <= 0)
- return NULL;
- idlen += itmp + 2;
- }
+/* Return nth shared curve. If nmatch == -1 return number of
+ * matches. For nmatch == -2 return the NID of the curve to use for
+ * an EC tmp key.
+ */
- if (s->tlsext_ocsp_exts)
+int tls1_shared_curve(SSL *s, int nmatch)
+ {
+ const unsigned char *pref, *supp;
+ size_t preflen, supplen, i, j;
+ int k;
+ /* Can't do anything on client side */
+ if (s->server == 0)
+ return -1;
+ if (nmatch == -2)
+ {
+ if (tls1_suiteb(s))
{
- extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
- if (extlen < 0)
- return NULL;
+ /* For Suite B ciphersuite determines curve: we
+ * already know these are acceptable due to previous
+ * checks.
+ */
+ unsigned long cid = s->s3->tmp.new_cipher->id;
+ if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
+ return NID_X9_62_prime256v1; /* P-256 */
+ if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
+ return NID_secp384r1; /* P-384 */
+ /* Should never happen */
+ return NID_undef;
}
- else
- extlen = 0;
-
- if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
- s2n(TLSEXT_TYPE_status_request, ret);
- if (extlen + idlen > 0xFFF0)
- return NULL;
- s2n(extlen + idlen + 5, ret);
- *(ret++) = TLSEXT_STATUSTYPE_ocsp;
- s2n(idlen, ret);
- for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
+ /* If not Suite B just return first preference shared curve */
+ nmatch = 0;
+ }
+ tls1_get_curvelist(s, !!(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE),
+ &supp, &supplen);
+ tls1_get_curvelist(s, !(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE),
+ &pref, &preflen);
+ preflen /= 2;
+ supplen /= 2;
+ k = 0;
+ for (i = 0; i < preflen; i++, pref+=2)
+ {
+ const unsigned char *tsupp = supp;
+ for (j = 0; j < supplen; j++, tsupp+=2)
{
- /* save position of id len */
- unsigned char *q = ret;
- id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
- /* skip over id len */
- ret += 2;
- itmp = i2d_OCSP_RESPID(id, &ret);
- /* write id len */
- s2n(itmp, q);
+ if (pref[0] == tsupp[0] && pref[1] == tsupp[1])
+ {
+ if (nmatch == k)
+ {
+ int id = (pref[0] << 8) | pref[1];
+ return tls1_ec_curve_id2nid(id);
+ }
+ k++;
+ }
}
- s2n(extlen, ret);
- if (extlen > 0)
- i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
}
-
- if ((extdatalen = ret-p-2)== 0)
- return p;
-
- s2n(extdatalen,p);
- return ret;
+ if (nmatch == -1)
+ return k;
+ return 0;
}
-unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
+int tls1_set_curves(unsigned char **pext, size_t *pextlen,
+ int *curves, size_t ncurves)
{
- int extdatalen=0;
- unsigned char *ret = p;
-
- ret+=2;
- if (ret>=limit) return NULL; /* this really never occurs, but ... */
-
- if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
- {
- if ((long)(limit - ret - 4) < 0) return NULL;
-
- s2n(TLSEXT_TYPE_server_name,ret);
- s2n(0,ret);
- }
-#ifndef OPENSSL_NO_EC
- if (s->tlsext_ecpointformatlist != NULL)
+ unsigned char *clist, *p;
+ size_t i;
+ /* Bitmap of curves included to detect duplicates: only works
+ * while curve ids < 32
+ */
+ unsigned long dup_list = 0;
+ clist = OPENSSL_malloc(ncurves * 2);
+ if (!clist)
+ return 0;
+ for (i = 0, p = clist; i < ncurves; i++)
{
- /* Add TLS extension ECPointFormats to the ServerHello message */
- long lenmax;
-
- if ((lenmax = limit - ret - 5) < 0) return NULL;
- if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
- if (s->tlsext_ecpointformatlist_length > 255)
+ unsigned long idmask;
+ int id;
+ id = tls1_ec_nid2curve_id(curves[i]);
+ idmask = 1L << id;
+ if (!id || (dup_list & idmask))
{
- SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
- return NULL;
+ OPENSSL_free(clist);
+ return 0;
}
-
- s2n(TLSEXT_TYPE_ec_point_formats,ret);
- s2n(s->tlsext_ecpointformatlist_length + 1,ret);
- *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
- memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
- ret+=s->tlsext_ecpointformatlist_length;
-
+ dup_list |= idmask;
+ s2n(id, p);
}
- /* Currently the server should not respond with a SupportedCurves extension */
-#endif /* OPENSSL_NO_EC */
+ if (*pext)
+ OPENSSL_free(*pext);
+ *pext = clist;
+ *pextlen = ncurves * 2;
+ return 1;
+ }
- if (s->tlsext_ticket_expected
- && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
- {
- if ((long)(limit - ret - 4) < 0) return NULL;
- s2n(TLSEXT_TYPE_session_ticket,ret);
- s2n(0,ret);
- }
+#define MAX_CURVELIST 28
- if (s->tlsext_status_expected)
- {
- if ((long)(limit - ret - 4) < 0) return NULL;
- s2n(TLSEXT_TYPE_status_request,ret);
- s2n(0,ret);
- }
+typedef struct
+ {
+ size_t nidcnt;
+ int nid_arr[MAX_CURVELIST];
+ } nid_cb_st;
-#ifdef TLSEXT_TYPE_opaque_prf_input
- if (s->s3->server_opaque_prf_input != NULL)
+static int nid_cb(const char *elem, int len, void *arg)
+ {
+ nid_cb_st *narg = arg;
+ size_t i;
+ int nid;
+ char etmp[20];
+ if (narg->nidcnt == MAX_CURVELIST)
+ return 0;
+ if (len > (int)(sizeof(etmp) - 1))
+ return 0;
+ memcpy(etmp, elem, len);
+ etmp[len] = 0;
+ nid = EC_curve_nist2nid(etmp);
+ if (nid == NID_undef)
+ nid = OBJ_sn2nid(etmp);
+ if (nid == NID_undef)
+ nid = OBJ_ln2nid(etmp);
+ if (nid == NID_undef)
+ return 0;
+ for (i = 0; i < narg->nidcnt; i++)
+ if (narg->nid_arr[i] == nid)
+ return 0;
+ narg->nid_arr[narg->nidcnt++] = nid;
+ return 1;
+ }
+/* Set curves based on a colon separate list */
+int tls1_set_curves_list(unsigned char **pext, size_t *pextlen,
+ const char *str)
+ {
+ nid_cb_st ncb;
+ ncb.nidcnt = 0;
+ if (!CONF_parse_list(str, ':', 1, nid_cb, &ncb))
+ return 0;
+ if (pext == NULL)
+ return 1;
+ return tls1_set_curves(pext, pextlen, ncb.nid_arr, ncb.nidcnt);
+ }
+/* For an EC key set TLS id and required compression based on parameters */
+static int tls1_set_ec_id(unsigned char *curve_id, unsigned char *comp_id,
+ EC_KEY *ec)
+ {
+ int is_prime, id;
+ const EC_GROUP *grp;
+ const EC_METHOD *meth;
+ if (!ec)
+ return 0;
+ /* Determine if it is a prime field */
+ grp = EC_KEY_get0_group(ec);
+ if (!grp)
+ return 0;
+ meth = EC_GROUP_method_of(grp);
+ if (!meth)
+ return 0;
+ if (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field)
+ is_prime = 1;
+ else
+ is_prime = 0;
+ /* Determine curve ID */
+ id = EC_GROUP_get_curve_name(grp);
+ id = tls1_ec_nid2curve_id(id);
+ /* If we have an ID set it, otherwise set arbitrary explicit curve */
+ if (id)
{
- size_t sol = s->s3->server_opaque_prf_input_len;
-
- if ((long)(limit - ret - 6 - sol) < 0)
- return NULL;
- if (sol > 0xFFFD) /* can't happen */
- return NULL;
+ curve_id[0] = 0;
+ curve_id[1] = (unsigned char)id;
+ }
+ else
+ {
+ curve_id[0] = 0xff;
+ if (is_prime)
+ curve_id[1] = 0x01;
+ else
+ curve_id[1] = 0x02;
+ }
+ if (comp_id)
+ {
+ if (EC_KEY_get0_public_key(ec) == NULL)
+ return 0;
+ if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_COMPRESSED)
+ {
+ if (is_prime)
+ *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
+ else
+ *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
+ }
+ else
+ *comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;
+ }
+ return 1;
+ }
+/* Check an EC key is compatible with extensions */
+static int tls1_check_ec_key(SSL *s,
+ unsigned char *curve_id, unsigned char *comp_id)
+ {
+ const unsigned char *p;
+ size_t plen, i;
+ int j;
+ /* If point formats extension present check it, otherwise everything
+ * is supported (see RFC4492).
+ */
+ if (comp_id && s->session->tlsext_ecpointformatlist)
+ {
+ p = s->session->tlsext_ecpointformatlist;
+ plen = s->session->tlsext_ecpointformatlist_length;
+ for (i = 0; i < plen; i++, p++)
+ {
+ if (*comp_id == *p)
+ break;
+ }
+ if (i == plen)
+ return 0;
+ }
+ if (!curve_id)
+ return 1;
+ /* Check curve is consistent with client and server preferences */
+ for (j = 0; j <= 1; j++)
+ {
+ tls1_get_curvelist(s, j, &p, &plen);
+ for (i = 0; i < plen; i+=2, p+=2)
+ {
+ if (p[0] == curve_id[0] && p[1] == curve_id[1])
+ break;
+ }
+ if (i == plen)
+ return 0;
+ /* For clients can only check sent curve list */
+ if (!s->server)
+ return 1;
+ }
+ return 1;
+ }
- s2n(TLSEXT_TYPE_opaque_prf_input, ret);
- s2n(sol + 2, ret);
- s2n(sol, ret);
- memcpy(ret, s->s3->server_opaque_prf_input, sol);
- ret += sol;
+static void tls1_get_formatlist(SSL *s, const unsigned char **pformats,
+ size_t *pformatslen)
+ {
+ /* If we have a custom point format list use it otherwise
+ * use default */
+ if (s->tlsext_ecpointformatlist)
+ {
+ *pformats = s->tlsext_ecpointformatlist;
+ *pformatslen = s->tlsext_ecpointformatlist_length;
+ }
+ else
+ {
+ *pformats = ecformats_default;
+ /* For Suite B we don't support char2 fields */
+ if (tls1_suiteb(s))
+ *pformatslen = sizeof(ecformats_default) - 1;
+ else
+ *pformatslen = sizeof(ecformats_default);
+ }
+ }
+
+/* Check cert parameters compatible with extensions: currently just checks
+ * EC certificates have compatible curves and compression.
+ */
+static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md)
+ {
+ unsigned char comp_id, curve_id[2];
+ EVP_PKEY *pkey;
+ int rv;
+ pkey = X509_get_pubkey(x);
+ if (!pkey)
+ return 0;
+ /* If not EC nothing to do */
+ if (pkey->type != EVP_PKEY_EC)
+ {
+ EVP_PKEY_free(pkey);
+ return 1;
+ }
+ rv = tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec);
+ EVP_PKEY_free(pkey);
+ if (!rv)
+ return 0;
+ /* Can't check curve_id for client certs as we don't have a
+ * supported curves extension.
+ */
+ rv = tls1_check_ec_key(s, s->server ? curve_id : NULL, &comp_id);
+ if (!rv)
+ return 0;
+ /* Special case for suite B. We *MUST* sign using SHA256+P-256 or
+ * SHA384+P-384, adjust digest if necessary.
+ */
+ if (set_ee_md && tls1_suiteb(s))
+ {
+ int check_md;
+ size_t i;
+ CERT *c = s->cert;
+ if (curve_id[0])
+ return 0;
+ /* Check to see we have necessary signing algorithm */
+ if (curve_id[1] == TLSEXT_curve_P_256)
+ check_md = NID_ecdsa_with_SHA256;
+ else if (curve_id[1] == TLSEXT_curve_P_384)
+ check_md = NID_ecdsa_with_SHA384;
+ else
+ return 0; /* Should never happen */
+ for (i = 0; i < c->shared_sigalgslen; i++)
+ if (check_md == c->shared_sigalgs[i].signandhash_nid)
+ break;
+ if (i == c->shared_sigalgslen)
+ return 0;
+ if (set_ee_md == 2)
+ {
+ if (check_md == NID_ecdsa_with_SHA256)
+ c->pkeys[SSL_PKEY_ECC].digest = EVP_sha256();
+ else
+ c->pkeys[SSL_PKEY_ECC].digest = EVP_sha384();
+ }
+ }
+ return rv;
+ }
+/* Check EC temporary key is compatible with client extensions */
+int tls1_check_ec_tmp_key(SSL *s, unsigned long cid)
+ {
+ unsigned char curve_id[2];
+ EC_KEY *ec = s->cert->ecdh_tmp;
+#ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
+ /* Allow any curve: not just those peer supports */
+ if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
+ return 1;
+#endif
+ /* If Suite B, AES128 MUST use P-256 and AES256 MUST use P-384,
+ * no other curves permitted.
+ */
+ if (tls1_suiteb(s))
+ {
+ /* Curve to check determined by ciphersuite */
+ if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
+ curve_id[1] = TLSEXT_curve_P_256;
+ else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
+ curve_id[1] = TLSEXT_curve_P_384;
+ else
+ return 0;
+ curve_id[0] = 0;
+ /* Check this curve is acceptable */
+ if (!tls1_check_ec_key(s, curve_id, NULL))
+ return 0;
+ /* If auto or setting curve from callback assume OK */
+ if (s->cert->ecdh_tmp_auto || s->cert->ecdh_tmp_cb)
+ return 1;
+ /* Otherwise check curve is acceptable */
+ else
+ {
+ unsigned char curve_tmp[2];
+ if (!ec)
+ return 0;
+ if (!tls1_set_ec_id(curve_tmp, NULL, ec))
+ return 0;
+ if (!curve_tmp[0] || curve_tmp[1] == curve_id[1])
+ return 1;
+ return 0;
+ }
+
+ }
+ if (s->cert->ecdh_tmp_auto)
+ {
+ /* Need a shared curve */
+ if (tls1_shared_curve(s, 0))
+ return 1;
+ else return 0;
+ }
+ if (!ec)
+ {
+ if (s->cert->ecdh_tmp_cb)
+ return 1;
+ else
+ return 0;
}
+ if (!tls1_set_ec_id(curve_id, NULL, ec))
+ return 0;
+/* Set this to allow use of invalid curves for testing */
+#if 0
+ return 1;
+#else
+ return tls1_check_ec_key(s, curve_id, NULL);
#endif
+ }
- if ((extdatalen = ret-p-2)== 0)
- return p;
+#else
- s2n(extdatalen,p);
- return ret;
+static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md)
+ {
+ return 1;
}
-int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
- {
- unsigned short type;
- unsigned short size;
- unsigned short len;
- unsigned char *data = *p;
- s->servername_done = 0;
- s->tlsext_status_type = -1;
+#endif /* OPENSSL_NO_EC */
- if (data >= (d+n-2))
- return 1;
- n2s(data,len);
+#ifndef OPENSSL_NO_TLSEXT
- if (data > (d+n-len))
- return 1;
+/* List of supported signature algorithms and hashes. Should make this
+ * customisable at some point, for now include everything we support.
+ */
- while (data <= (d+n-4))
- {
- n2s(data,type);
- n2s(data,size);
+#ifdef OPENSSL_NO_RSA
+#define tlsext_sigalg_rsa(md) /* */
+#else
+#define tlsext_sigalg_rsa(md) md, TLSEXT_signature_rsa,
+#endif
- if (data+size > (d+n))
- return 1;
+#ifdef OPENSSL_NO_DSA
+#define tlsext_sigalg_dsa(md) /* */
+#else
+#define tlsext_sigalg_dsa(md) md, TLSEXT_signature_dsa,
+#endif
- if (s->tlsext_debug_cb)
- s->tlsext_debug_cb(s, 0, type, data, size,
- s->tlsext_debug_arg);
-/* The servername extension is treated as follows:
+#ifdef OPENSSL_NO_ECDSA
+#define tlsext_sigalg_ecdsa(md) /* */
+#else
+#define tlsext_sigalg_ecdsa(md) md, TLSEXT_signature_ecdsa,
+#endif
- - Only the hostname type is supported with a maximum length of 255.
- - The servername is rejected if too long or if it contains zeros,
- in which case an fatal alert is generated.
- - The servername field is maintained together with the session cache.
- - When a session is resumed, the servername call back invoked in order
- to allow the application to position itself to the right context.
- - The servername is acknowledged if it is new for a session or when
- it is identical to a previously used for the same session.
- Applications can control the behaviour. They can at any time
- set a 'desirable' servername for a new SSL object. This can be the
- case for example with HTTPS when a Host: header field is received and
- a renegotiation is requested. In this case, a possible servername
- presented in the new client hello is only acknowledged if it matches
- the value of the Host: field.
- - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
- if they provide for changing an explicit servername context for the session,
- i.e. when the session has been established with a servername extension.
- - On session reconnect, the servername extension may be absent.
+#define tlsext_sigalg(md) \
+ tlsext_sigalg_rsa(md) \
+ tlsext_sigalg_dsa(md) \
+ tlsext_sigalg_ecdsa(md)
-*/
+static unsigned char tls12_sigalgs[] = {
+#ifndef OPENSSL_NO_SHA512
+ tlsext_sigalg(TLSEXT_hash_sha512)
+ tlsext_sigalg(TLSEXT_hash_sha384)
+#endif
+#ifndef OPENSSL_NO_SHA256
+ tlsext_sigalg(TLSEXT_hash_sha256)
+ tlsext_sigalg(TLSEXT_hash_sha224)
+#endif
+#ifndef OPENSSL_NO_SHA
+ tlsext_sigalg(TLSEXT_hash_sha1)
+#endif
+};
+#ifndef OPENSSL_NO_ECDSA
+static unsigned char suiteb_sigalgs[] = {
+ tlsext_sigalg_ecdsa(TLSEXT_hash_sha256)
+ tlsext_sigalg_ecdsa(TLSEXT_hash_sha384)
+};
+#endif
+size_t tls12_get_psigalgs(SSL *s, const unsigned char **psigs)
+ {
+ /* If Suite B mode use Suite B sigalgs only, ignore any other
+ * preferences.
+ */
+#ifndef OPENSSL_NO_EC
+ switch (tls1_suiteb(s))
+ {
+ case SSL_CERT_FLAG_SUITEB_128_LOS:
+ *psigs = suiteb_sigalgs;
+ return sizeof(suiteb_sigalgs);
- if (type == TLSEXT_TYPE_server_name)
+ case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
+ *psigs = suiteb_sigalgs;
+ return 2;
+
+ case SSL_CERT_FLAG_SUITEB_192_LOS:
+ *psigs = suiteb_sigalgs + 2;
+ return 2;
+ }
+#endif
+ /* If server use client authentication sigalgs if not NULL */
+ if (s->server && s->cert->client_sigalgs)
+ {
+ *psigs = s->cert->client_sigalgs;
+ return s->cert->client_sigalgslen;
+ }
+ else if (s->cert->conf_sigalgs)
+ {
+ *psigs = s->cert->conf_sigalgs;
+ return s->cert->conf_sigalgslen;
+ }
+ else
+ {
+ *psigs = tls12_sigalgs;
+ return sizeof(tls12_sigalgs);
+ }
+ }
+/* Check signature algorithm is consistent with sent supported signature
+ * algorithms and if so return relevant digest.
+ */
+int tls12_check_peer_sigalg(const EVP_MD **pmd, SSL *s,
+ const unsigned char *sig, EVP_PKEY *pkey)
+ {
+ const unsigned char *sent_sigs;
+ size_t sent_sigslen, i;
+ int sigalg = tls12_get_sigid(pkey);
+ /* Should never happen */
+ if (sigalg == -1)
+ return -1;
+ /* Check key type is consistent with signature */
+ if (sigalg != (int)sig[1])
+ {
+ SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_SIGNATURE_TYPE);
+ return 0;
+ }
+#ifndef OPENSSL_NO_EC
+ if (pkey->type == EVP_PKEY_EC)
+ {
+ unsigned char curve_id[2], comp_id;
+ /* Check compression and curve matches extensions */
+ if (!tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec))
+ return 0;
+ if (!s->server && !tls1_check_ec_key(s, curve_id, &comp_id))
{
- unsigned char *sdata;
- int servname_type;
- int dsize;
-
- if (size < 2)
- {
- *al = SSL_AD_DECODE_ERROR;
- return 0;
- }
- n2s(data,dsize);
- size -= 2;
- if (dsize > size )
- {
- *al = SSL_AD_DECODE_ERROR;
+ SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_CURVE);
+ return 0;
+ }
+ /* If Suite B only P-384+SHA384 or P-256+SHA-256 allowed */
+ if (tls1_suiteb(s))
+ {
+ if (curve_id[0])
return 0;
- }
-
- sdata = data;
- while (dsize > 3)
+ if (curve_id[1] == TLSEXT_curve_P_256)
{
- servname_type = *(sdata++);
- n2s(sdata,len);
- dsize -= 3;
-
- if (len > dsize)
+ if (sig[0] != TLSEXT_hash_sha256)
{
- *al = SSL_AD_DECODE_ERROR;
+ SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
+ SSL_R_ILLEGAL_SUITEB_DIGEST);
return 0;
}
- if (s->servername_done == 0)
- switch (servname_type)
+ }
+ else if (curve_id[1] == TLSEXT_curve_P_384)
+ {
+ if (sig[0] != TLSEXT_hash_sha384)
{
- case TLSEXT_NAMETYPE_host_name:
- if (s->session->tlsext_hostname == NULL)
- {
- if (len > TLSEXT_MAXLEN_host_name ||
- ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL))
- {
- *al = TLS1_AD_UNRECOGNIZED_NAME;
- return 0;
- }
- memcpy(s->session->tlsext_hostname, sdata, len);
- s->session->tlsext_hostname[len]='\0';
- if (strlen(s->session->tlsext_hostname) != len) {
- OPENSSL_free(s->session->tlsext_hostname);
- *al = TLS1_AD_UNRECOGNIZED_NAME;
- return 0;
- }
- s->servername_done = 1;
-
- }
- else
- s->servername_done = strlen(s->session->tlsext_hostname) == len
- && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
-
- break;
-
- default:
- break;
+ SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
+ SSL_R_ILLEGAL_SUITEB_DIGEST);
+ return 0;
}
-
- dsize -= len;
}
- if (dsize != 0)
- {
- *al = SSL_AD_DECODE_ERROR;
+ else
return 0;
- }
-
}
+ }
+ else if (tls1_suiteb(s))
+ return 0;
+#endif
-#ifndef OPENSSL_NO_EC
- else if (type == TLSEXT_TYPE_ec_point_formats)
- {
- unsigned char *sdata = data;
- int ecpointformatlist_length = *(sdata++);
-
- if (ecpointformatlist_length != size - 1)
- {
- *al = TLS1_AD_DECODE_ERROR;
- return 0;
- }
- s->session->tlsext_ecpointformatlist_length = 0;
- if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
- if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
- {
- *al = TLS1_AD_INTERNAL_ERROR;
- return 0;
- }
- s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
- memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
-#if 0
- fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
- sdata = s->session->tlsext_ecpointformatlist;
- for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
- fprintf(stderr,"%i ",*(sdata++));
- fprintf(stderr,"\n");
+ /* Check signature matches a type we sent */
+ sent_sigslen = tls12_get_psigalgs(s, &sent_sigs);
+ for (i = 0; i < sent_sigslen; i+=2, sent_sigs+=2)
+ {
+ if (sig[0] == sent_sigs[0] && sig[1] == sent_sigs[1])
+ break;
+ }
+ /* Allow fallback to SHA1 if not strict mode */
+ if (i == sent_sigslen && (sig[0] != TLSEXT_hash_sha1 || s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT))
+ {
+ SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_SIGNATURE_TYPE);
+ return 0;
+ }
+ *pmd = tls12_get_hash(sig[0]);
+ if (*pmd == NULL)
+ {
+ SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_UNKNOWN_DIGEST);
+ return 0;
+ }
+ /* Store the digest used so applications can retrieve it if they
+ * wish.
+ */
+ if (s->session && s->session->sess_cert)
+ s->session->sess_cert->peer_key->digest = *pmd;
+ return 1;
+ }
+/* Get a mask of disabled algorithms: an algorithm is disabled
+ * if it isn't supported or doesn't appear in supported signature
+ * algorithms. Unlike ssl_cipher_get_disabled this applies to a specific
+ * session and not global settings.
+ *
+ */
+void ssl_set_client_disabled(SSL *s)
+ {
+ CERT *c = s->cert;
+ const unsigned char *sigalgs;
+ size_t i, sigalgslen;
+ int have_rsa = 0, have_dsa = 0, have_ecdsa = 0;
+ c->mask_a = 0;
+ c->mask_k = 0;
+ /* Don't allow TLS 1.2 only ciphers if we don't suppport them */
+ if (!SSL_CLIENT_USE_TLS1_2_CIPHERS(s))
+ c->mask_ssl = SSL_TLSV1_2;
+ else
+ c->mask_ssl = 0;
+ /* Now go through all signature algorithms seeing if we support
+ * any for RSA, DSA, ECDSA. Do this for all versions not just
+ * TLS 1.2.
+ */
+ sigalgslen = tls12_get_psigalgs(s, &sigalgs);
+ for (i = 0; i < sigalgslen; i += 2, sigalgs += 2)
+ {
+ switch(sigalgs[1])
+ {
+#ifndef OPENSSL_NO_RSA
+ case TLSEXT_signature_rsa:
+ have_rsa = 1;
+ break;
+#endif
+#ifndef OPENSSL_NO_DSA
+ case TLSEXT_signature_dsa:
+ have_dsa = 1;
+ break;
+#endif
+#ifndef OPENSSL_NO_ECDSA
+ case TLSEXT_signature_ecdsa:
+ have_ecdsa = 1;
+ break;
#endif
}
- else if (type == TLSEXT_TYPE_elliptic_curves)
+ }
+ /* Disable auth and static DH if we don't include any appropriate
+ * signature algorithms.
+ */
+ if (!have_rsa)
+ {
+ c->mask_a |= SSL_aRSA;
+ c->mask_k |= SSL_kDHr|SSL_kECDHr;
+ }
+ if (!have_dsa)
+ {
+ c->mask_a |= SSL_aDSS;
+ c->mask_k |= SSL_kDHd;
+ }
+ if (!have_ecdsa)
+ {
+ c->mask_a |= SSL_aECDSA;
+ c->mask_k |= SSL_kECDHe;
+ }
+#ifndef OPENSSL_NO_KRB5
+ if (!kssl_tgt_is_available(s->kssl_ctx))
+ {
+ c->mask_a |= SSL_aKRB5;
+ c->mask_k |= SSL_kKRB5;
+ }
+#endif
+#ifndef OPENSSL_NO_PSK
+ /* with PSK there must be client callback set */
+ if (!s->psk_client_callback)
+ {
+ c->mask_a |= SSL_aPSK;
+ c->mask_k |= SSL_kPSK;
+ }
+#endif /* OPENSSL_NO_PSK */
+ c->valid = 1;
+ }
+
+unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit, int *al)
+ {
+ int extdatalen=0;
+ unsigned char *ret = p;
+#ifndef OPENSSL_NO_EC
+ /* See if we support any ECC ciphersuites */
+ int using_ecc = 0;
+ if (s->version >= TLS1_VERSION || SSL_IS_DTLS(s))
+ {
+ int i;
+ unsigned long alg_k, alg_a;
+ STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
+
+ for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
{
- unsigned char *sdata = data;
- int ellipticcurvelist_length = (*(sdata++) << 8);
- ellipticcurvelist_length += (*(sdata++));
+ SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
- if (ellipticcurvelist_length != size - 2)
- {
- *al = TLS1_AD_DECODE_ERROR;
- return 0;
- }
- s->session->tlsext_ellipticcurvelist_length = 0;
- if (s->session->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->session->tlsext_ellipticcurvelist);
- if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
+ alg_k = c->algorithm_mkey;
+ alg_a = c->algorithm_auth;
+ if ((alg_k & (SSL_kECDHE|SSL_kECDHr|SSL_kECDHe)
+ || (alg_a & SSL_aECDSA)))
{
- *al = TLS1_AD_INTERNAL_ERROR;
- return 0;
+ using_ecc = 1;
+ break;
}
- s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
- memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
-#if 0
- fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
- sdata = s->session->tlsext_ellipticcurvelist;
- for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
- fprintf(stderr,"%i ",*(sdata++));
- fprintf(stderr,"\n");
-#endif
}
-#endif /* OPENSSL_NO_EC */
-#ifdef TLSEXT_TYPE_opaque_prf_input
- else if (type == TLSEXT_TYPE_opaque_prf_input)
+ }
+#endif
+
+ /* don't add extensions for SSLv3 unless doing secure renegotiation */
+ if (s->client_version == SSL3_VERSION
+ && !s->s3->send_connection_binding)
+ return p;
+
+ ret+=2;
+
+ if (ret>=limit) return NULL; /* this really never occurs, but ... */
+
+ if (s->tlsext_hostname != NULL)
+ {
+ /* Add TLS extension servername to the Client Hello message */
+ unsigned long size_str;
+ long lenmax;
+
+ /* check for enough space.
+ 4 for the servername type and entension length
+ 2 for servernamelist length
+ 1 for the hostname type
+ 2 for hostname length
+ + hostname length
+ */
+
+ if ((lenmax = limit - ret - 9) < 0
+ || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
+ return NULL;
+
+ /* extension type and length */
+ s2n(TLSEXT_TYPE_server_name,ret);
+ s2n(size_str+5,ret);
+
+ /* length of servername list */
+ s2n(size_str+3,ret);
+
+ /* hostname type, length and hostname */
+ *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
+ s2n(size_str,ret);
+ memcpy(ret, s->tlsext_hostname, size_str);
+ ret+=size_str;
+ }
+
+ /* Add RI if renegotiating */
+ if (s->renegotiate)
+ {
+ int el;
+
+ if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
+ {
+ SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
+ return NULL;
+ }
+
+ if((limit - p - 4 - el) < 0) return NULL;
+
+ s2n(TLSEXT_TYPE_renegotiate,ret);
+ s2n(el,ret);
+
+ if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
+ {
+ SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
+ return NULL;
+ }
+
+ ret += el;
+ }
+
+#ifndef OPENSSL_NO_SRP
+ /* Add SRP username if there is one */
+ if (s->srp_ctx.login != NULL)
+ { /* Add TLS extension SRP username to the Client Hello message */
+
+ int login_len = strlen(s->srp_ctx.login);
+ if (login_len > 255 || login_len == 0)
{
- unsigned char *sdata = data;
+ SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
+ return NULL;
+ }
- if (size < 2)
- {
- *al = SSL_AD_DECODE_ERROR;
- return 0;
- }
- n2s(sdata, s->s3->client_opaque_prf_input_len);
- if (s->s3->client_opaque_prf_input_len != size - 2)
- {
- *al = SSL_AD_DECODE_ERROR;
- return 0;
- }
+ /* check for enough space.
+ 4 for the srp type type and entension length
+ 1 for the srp user identity
+ + srp user identity length
+ */
+ if ((limit - ret - 5 - login_len) < 0) return NULL;
- if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
- OPENSSL_free(s->s3->client_opaque_prf_input);
- if (s->s3->client_opaque_prf_input_len == 0)
- s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
- else
- s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
- if (s->s3->client_opaque_prf_input == NULL)
- {
- *al = TLS1_AD_INTERNAL_ERROR;
- return 0;
- }
- }
+ /* fill in the extension */
+ s2n(TLSEXT_TYPE_srp,ret);
+ s2n(login_len+1,ret);
+ (*ret++) = (unsigned char) login_len;
+ memcpy(ret, s->srp_ctx.login, login_len);
+ ret+=login_len;
+ }
#endif
- else if (type == TLSEXT_TYPE_status_request
- && s->ctx->tlsext_status_cb)
+
+#ifndef OPENSSL_NO_EC
+ if (using_ecc)
+ {
+ /* Add TLS extension ECPointFormats to the ClientHello message */
+ long lenmax;
+ const unsigned char *plist;
+ size_t plistlen;
+
+ tls1_get_formatlist(s, &plist, &plistlen);
+
+ if ((lenmax = limit - ret - 5) < 0) return NULL;
+ if (plistlen > (size_t)lenmax) return NULL;
+ if (plistlen > 255)
{
+ SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
+ return NULL;
+ }
- if (size < 5)
- {
- *al = SSL_AD_DECODE_ERROR;
- return 0;
- }
+ s2n(TLSEXT_TYPE_ec_point_formats,ret);
+ s2n(plistlen + 1,ret);
+ *(ret++) = (unsigned char)plistlen ;
+ memcpy(ret, plist, plistlen);
+ ret+=plistlen;
- s->tlsext_status_type = *data++;
- size--;
- if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
- {
- const unsigned char *sdata;
- int dsize;
- /* Read in responder_id_list */
- n2s(data,dsize);
- size -= 2;
- if (dsize > size )
- {
- *al = SSL_AD_DECODE_ERROR;
- return 0;
- }
- while (dsize > 0)
- {
- OCSP_RESPID *id;
- int idsize;
- if (dsize < 4)
- {
- *al = SSL_AD_DECODE_ERROR;
- return 0;
- }
- n2s(data, idsize);
- dsize -= 2 + idsize;
- if (dsize < 0)
- {
- *al = SSL_AD_DECODE_ERROR;
- return 0;
- }
- sdata = data;
- data += idsize;
- id = d2i_OCSP_RESPID(NULL,
- &sdata, idsize);
- if (!id)
- {
- *al = SSL_AD_DECODE_ERROR;
- return 0;
- }
- if (data != sdata)
- {
- OCSP_RESPID_free(id);
- *al = SSL_AD_DECODE_ERROR;
- return 0;
- }
- if (!s->tlsext_ocsp_ids
- && !(s->tlsext_ocsp_ids =
- sk_OCSP_RESPID_new_null()))
- {
- OCSP_RESPID_free(id);
- *al = SSL_AD_INTERNAL_ERROR;
- return 0;
- }
- if (!sk_OCSP_RESPID_push(
- s->tlsext_ocsp_ids, id))
- {
- OCSP_RESPID_free(id);
- *al = SSL_AD_INTERNAL_ERROR;
- return 0;
- }
- }
+ /* Add TLS extension EllipticCurves to the ClientHello message */
+ plist = s->tlsext_ellipticcurvelist;
+ tls1_get_curvelist(s, 0, &plist, &plistlen);
- /* Read in request_extensions */
- n2s(data,dsize);
- size -= 2;
- if (dsize > size)
- {
- *al = SSL_AD_DECODE_ERROR;
- return 0;
+ if ((lenmax = limit - ret - 6) < 0) return NULL;
+ if (plistlen > (size_t)lenmax) return NULL;
+ if (plistlen > 65532)
+ {
+ SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
+ return NULL;
+ }
+
+ s2n(TLSEXT_TYPE_elliptic_curves,ret);
+ s2n(plistlen + 2, ret);
+
+ /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
+ * elliptic_curve_list, but the examples use two bytes.
+ * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
+ * resolves this to two bytes.
+ */
+ s2n(plistlen, ret);
+ memcpy(ret, plist, plistlen);
+ ret+=plistlen;
+ }
+#endif /* OPENSSL_NO_EC */
+
+ if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
+ {
+ int ticklen;
+ if (!s->new_session && s->session && s->session->tlsext_tick)
+ ticklen = s->session->tlsext_ticklen;
+ else if (s->session && s->tlsext_session_ticket &&
+ s->tlsext_session_ticket->data)
+ {
+ ticklen = s->tlsext_session_ticket->length;
+ s->session->tlsext_tick = OPENSSL_malloc(ticklen);
+ if (!s->session->tlsext_tick)
+ return NULL;
+ memcpy(s->session->tlsext_tick,
+ s->tlsext_session_ticket->data,
+ ticklen);
+ s->session->tlsext_ticklen = ticklen;
+ }
+ else
+ ticklen = 0;
+ if (ticklen == 0 && s->tlsext_session_ticket &&
+ s->tlsext_session_ticket->data == NULL)
+ goto skip_ext;
+ /* Check for enough room 2 for extension type, 2 for len
+ * rest for ticket
+ */
+ if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
+ s2n(TLSEXT_TYPE_session_ticket,ret);
+ s2n(ticklen,ret);
+ if (ticklen)
+ {
+ memcpy(ret, s->session->tlsext_tick, ticklen);
+ ret += ticklen;
+ }
+ }
+ skip_ext:
+
+ if (SSL_USE_SIGALGS(s))
+ {
+ size_t salglen;
+ const unsigned char *salg;
+ salglen = tls12_get_psigalgs(s, &salg);
+ if ((size_t)(limit - ret) < salglen + 6)
+ return NULL;
+ s2n(TLSEXT_TYPE_signature_algorithms,ret);
+ s2n(salglen + 2, ret);
+ s2n(salglen, ret);
+ memcpy(ret, salg, salglen);
+ ret += salglen;
+ }
+
+#ifdef TLSEXT_TYPE_opaque_prf_input
+ if (s->s3->client_opaque_prf_input != NULL)
+ {
+ size_t col = s->s3->client_opaque_prf_input_len;
+
+ if ((long)(limit - ret - 6 - col < 0))
+ return NULL;
+ if (col > 0xFFFD) /* can't happen */
+ return NULL;
+
+ s2n(TLSEXT_TYPE_opaque_prf_input, ret);
+ s2n(col + 2, ret);
+ s2n(col, ret);
+ memcpy(ret, s->s3->client_opaque_prf_input, col);
+ ret += col;
+ }
+#endif
+
+ if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
+ {
+ int i;
+ long extlen, idlen, itmp;
+ OCSP_RESPID *id;
+
+ idlen = 0;
+ for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
+ {
+ id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
+ itmp = i2d_OCSP_RESPID(id, NULL);
+ if (itmp <= 0)
+ return NULL;
+ idlen += itmp + 2;
+ }
+
+ if (s->tlsext_ocsp_exts)
+ {
+ extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
+ if (extlen < 0)
+ return NULL;
+ }
+ else
+ extlen = 0;
+
+ if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
+ s2n(TLSEXT_TYPE_status_request, ret);
+ if (extlen + idlen > 0xFFF0)
+ return NULL;
+ s2n(extlen + idlen + 5, ret);
+ *(ret++) = TLSEXT_STATUSTYPE_ocsp;
+ s2n(idlen, ret);
+ for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
+ {
+ /* save position of id len */
+ unsigned char *q = ret;
+ id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
+ /* skip over id len */
+ ret += 2;
+ itmp = i2d_OCSP_RESPID(id, &ret);
+ /* write id len */
+ s2n(itmp, q);
+ }
+ s2n(extlen, ret);
+ if (extlen > 0)
+ i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
+ }
+
+#ifndef OPENSSL_NO_HEARTBEATS
+ /* Add Heartbeat extension */
+ s2n(TLSEXT_TYPE_heartbeat,ret);
+ s2n(1,ret);
+ /* Set mode:
+ * 1: peer may send requests
+ * 2: peer not allowed to send requests
+ */
+ if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
+ *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
+ else
+ *(ret++) = SSL_TLSEXT_HB_ENABLED;
+#endif
+
+#ifndef OPENSSL_NO_NEXTPROTONEG
+ if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len)
+ {
+ /* The client advertises an emtpy extension to indicate its
+ * support for Next Protocol Negotiation */
+ if (limit - ret - 4 < 0)
+ return NULL;
+ s2n(TLSEXT_TYPE_next_proto_neg,ret);
+ s2n(0,ret);
+ }
+#endif
+
+ if (s->alpn_client_proto_list && !s->s3->tmp.finish_md_len)
+ {
+ if ((size_t)(limit - ret) < 6 + s->alpn_client_proto_list_len)
+ return NULL;
+ s2n(TLSEXT_TYPE_application_layer_protocol_negotiation,ret);
+ s2n(2 + s->alpn_client_proto_list_len,ret);
+ s2n(s->alpn_client_proto_list_len,ret);
+ memcpy(ret, s->alpn_client_proto_list,
+ s->alpn_client_proto_list_len);
+ ret += s->alpn_client_proto_list_len;
+ }
+
+ if(SSL_get_srtp_profiles(s))
+ {
+ int el;
+
+ ssl_add_clienthello_use_srtp_ext(s, 0, &el, 0);
+
+ if((limit - p - 4 - el) < 0) return NULL;
+
+ s2n(TLSEXT_TYPE_use_srtp,ret);
+ s2n(el,ret);
+
+ if(ssl_add_clienthello_use_srtp_ext(s, ret, &el, el))
+ {
+ SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
+ return NULL;
+ }
+ ret += el;
+ }
+
+ /* Add custom TLS Extensions to ClientHello */
+ if (s->ctx->custom_cli_ext_records_count)
+ {
+ size_t i;
+ custom_cli_ext_record* record;
+
+ for (i = 0; i < s->ctx->custom_cli_ext_records_count; i++)
+ {
+ const unsigned char* out = NULL;
+ unsigned short outlen = 0;
+
+ record = &s->ctx->custom_cli_ext_records[i];
+ /* NULL callback sends empty extension */
+ /* -1 from callback omits extension */
+ if (record->fn1)
+ {
+ int cb_retval = 0;
+ cb_retval = record->fn1(s, record->ext_type,
+ &out, &outlen, al,
+ record->arg);
+ if (cb_retval == 0)
+ return NULL; /* error */
+ if (cb_retval == -1)
+ continue; /* skip this extension */
+ }
+ if (limit < ret + 4 + outlen)
+ return NULL;
+ s2n(record->ext_type, ret);
+ s2n(outlen, ret);
+ memcpy(ret, out, outlen);
+ ret += outlen;
+ }
+ }
+#ifdef TLSEXT_TYPE_encrypt_then_mac
+ s2n(TLSEXT_TYPE_encrypt_then_mac,ret);
+ s2n(0,ret);
+#endif
+#ifdef TLSEXT_TYPE_padding
+ /* Add padding to workaround bugs in F5 terminators.
+ * See https://tools.ietf.org/html/draft-agl-tls-padding-02
+ *
+ * NB: because this code works out the length of all existing
+ * extensions it MUST always appear last.
+ */
+ {
+ int hlen = ret - (unsigned char *)s->init_buf->data;
+ /* The code in s23_clnt.c to build ClientHello messages includes the
+ * 5-byte record header in the buffer, while the code in s3_clnt.c does
+ * not. */
+ if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
+ hlen -= 5;
+ if (hlen > 0xff && hlen < 0x200)
+ {
+ hlen = 0x200 - hlen;
+ if (hlen >= 4)
+ hlen -= 4;
+ else
+ hlen = 0;
+
+ s2n(TLSEXT_TYPE_padding, ret);
+ s2n(hlen, ret);
+ memset(ret, 0, hlen);
+ ret += hlen;
+ }
+ }
+#endif
+
+ if ((extdatalen = ret-p-2) == 0)
+ return p;
+
+ s2n(extdatalen,p);
+ return ret;
+ }
+
+unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit, int *al)
+ {
+ int extdatalen=0;
+ unsigned char *ret = p;
+ size_t i;
+ custom_srv_ext_record *record;
+#ifndef OPENSSL_NO_NEXTPROTONEG
+ int next_proto_neg_seen;
+#endif
+#ifndef OPENSSL_NO_EC
+ unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
+ unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
+ int using_ecc = (alg_k & (SSL_kECDHE|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
+ using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
+#endif
+ /* don't add extensions for SSLv3, unless doing secure renegotiation */
+ if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
+ return p;
+
+ ret+=2;
+ if (ret>=limit) return NULL; /* this really never occurs, but ... */
+
+ if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
+ {
+ if ((long)(limit - ret - 4) < 0) return NULL;
+
+ s2n(TLSEXT_TYPE_server_name,ret);
+ s2n(0,ret);
+ }
+
+ if(s->s3->send_connection_binding)
+ {
+ int el;
+
+ if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
+ {
+ SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
+ return NULL;
+ }
+
+ if((limit - p - 4 - el) < 0) return NULL;
+
+ s2n(TLSEXT_TYPE_renegotiate,ret);
+ s2n(el,ret);
+
+ if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
+ {
+ SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
+ return NULL;
+ }
+
+ ret += el;
+ }
+
+#ifndef OPENSSL_NO_EC
+ if (using_ecc)
+ {
+ const unsigned char *plist;
+ size_t plistlen;
+ /* Add TLS extension ECPointFormats to the ServerHello message */
+ long lenmax;
+
+ tls1_get_formatlist(s, &plist, &plistlen);
+
+ if ((lenmax = limit - ret - 5) < 0) return NULL;
+ if (plistlen > (size_t)lenmax) return NULL;
+ if (plistlen > 255)
+ {
+ SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
+ return NULL;
+ }
+
+ s2n(TLSEXT_TYPE_ec_point_formats,ret);
+ s2n(plistlen + 1,ret);
+ *(ret++) = (unsigned char) plistlen;
+ memcpy(ret, plist, plistlen);
+ ret+=plistlen;
+
+ }
+ /* Currently the server should not respond with a SupportedCurves extension */
+#endif /* OPENSSL_NO_EC */
+
+ if (s->tlsext_ticket_expected
+ && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
+ {
+ if ((long)(limit - ret - 4) < 0) return NULL;
+ s2n(TLSEXT_TYPE_session_ticket,ret);
+ s2n(0,ret);
+ }
+
+ if (s->tlsext_status_expected)
+ {
+ if ((long)(limit - ret - 4) < 0) return NULL;
+ s2n(TLSEXT_TYPE_status_request,ret);
+ s2n(0,ret);
+ }
+
+#ifdef TLSEXT_TYPE_opaque_prf_input
+ if (s->s3->server_opaque_prf_input != NULL)
+ {
+ size_t sol = s->s3->server_opaque_prf_input_len;
+
+ if ((long)(limit - ret - 6 - sol) < 0)
+ return NULL;
+ if (sol > 0xFFFD) /* can't happen */
+ return NULL;
+
+ s2n(TLSEXT_TYPE_opaque_prf_input, ret);
+ s2n(sol + 2, ret);
+ s2n(sol, ret);
+ memcpy(ret, s->s3->server_opaque_prf_input, sol);
+ ret += sol;
+ }
+#endif
+
+ if(s->srtp_profile)
+ {
+ int el;
+
+ ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0);
+
+ if((limit - p - 4 - el) < 0) return NULL;
+
+ s2n(TLSEXT_TYPE_use_srtp,ret);
+ s2n(el,ret);
+
+ if(ssl_add_serverhello_use_srtp_ext(s, ret, &el, el))
+ {
+ SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
+ return NULL;
+ }
+ ret+=el;
+ }
+
+ if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81)
+ && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
+ { const unsigned char cryptopro_ext[36] = {
+ 0xfd, 0xe8, /*65000*/
+ 0x00, 0x20, /*32 bytes length*/
+ 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
+ 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
+ 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
+ 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
+ if (limit-ret<36) return NULL;
+ memcpy(ret,cryptopro_ext,36);
+ ret+=36;
+
+ }
+
+#ifndef OPENSSL_NO_HEARTBEATS
+ /* Add Heartbeat extension if we've received one */
+ if (s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED)
+ {
+ s2n(TLSEXT_TYPE_heartbeat,ret);
+ s2n(1,ret);
+ /* Set mode:
+ * 1: peer may send requests
+ * 2: peer not allowed to send requests
+ */
+ if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
+ *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
+ else
+ *(ret++) = SSL_TLSEXT_HB_ENABLED;
+
+ }
+#endif
+
+#ifndef OPENSSL_NO_NEXTPROTONEG
+ next_proto_neg_seen = s->s3->next_proto_neg_seen;
+ s->s3->next_proto_neg_seen = 0;
+ if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb)
+ {
+ const unsigned char *npa;
+ unsigned int npalen;
+ int r;
+
+ r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen, s->ctx->next_protos_advertised_cb_arg);
+ if (r == SSL_TLSEXT_ERR_OK)
+ {
+ if ((long)(limit - ret - 4 - npalen) < 0) return NULL;
+ s2n(TLSEXT_TYPE_next_proto_neg,ret);
+ s2n(npalen,ret);
+ memcpy(ret, npa, npalen);
+ ret += npalen;
+ s->s3->next_proto_neg_seen = 1;
+ }
+ }
+#endif
+
+ for (i = 0; i < s->ctx->custom_srv_ext_records_count; i++)
+ {
+ const unsigned char *out = NULL;
+ unsigned short outlen = 0;
+ int cb_retval = 0;
+
+ record = &s->ctx->custom_srv_ext_records[i];
+
+ /* NULL callback or -1 omits extension */
+ if (!record->fn2)
+ continue;
+ cb_retval = record->fn2(s, record->ext_type,
+ &out, &outlen, al,
+ record->arg);
+ if (cb_retval == 0)
+ return NULL; /* error */
+ if (cb_retval == -1)
+ continue; /* skip this extension */
+ if (limit < ret + 4 + outlen)
+ return NULL;
+ s2n(record->ext_type, ret);
+ s2n(outlen, ret);
+ memcpy(ret, out, outlen);
+ ret += outlen;
+ }
+#ifdef TLSEXT_TYPE_encrypt_then_mac
+ if (s->s3->flags & TLS1_FLAGS_ENCRYPT_THEN_MAC)
+ {
+ /* Don't use encrypt_then_mac if AEAD: might want
+ * to disable for other ciphersuites too.
+ */
+ if (s->s3->tmp.new_cipher->algorithm_mac == SSL_AEAD)
+ s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
+ else
+ {
+ s2n(TLSEXT_TYPE_encrypt_then_mac,ret);
+ s2n(0,ret);
+ }
+ }
+#endif
+
+ if (s->s3->alpn_selected)
+ {
+ const unsigned char *selected = s->s3->alpn_selected;
+ unsigned len = s->s3->alpn_selected_len;
+
+ if ((long)(limit - ret - 4 - 2 - 1 - len) < 0)
+ return NULL;
+ s2n(TLSEXT_TYPE_application_layer_protocol_negotiation,ret);
+ s2n(3 + len,ret);
+ s2n(1 + len,ret);
+ *ret++ = len;
+ memcpy(ret, selected, len);
+ ret += len;
+ }
+
+ if ((extdatalen = ret-p-2)== 0)
+ return p;
+
+ s2n(extdatalen,p);
+ return ret;
+ }
+
+/* tls1_alpn_handle_client_hello is called to process the ALPN extension in a
+ * ClientHello.
+ * data: the contents of the extension, not including the type and length.
+ * data_len: the number of bytes in |data|
+ * al: a pointer to the alert value to send in the event of a non-zero
+ * return.
+ *
+ * returns: 0 on success. */
+static int tls1_alpn_handle_client_hello(SSL *s, const unsigned char *data,
+ unsigned data_len, int *al)
+ {
+ unsigned i;
+ unsigned proto_len;
+ const unsigned char *selected;
+ unsigned char selected_len;
+ int r;
+
+ if (s->ctx->alpn_select_cb == NULL)
+ return 0;
+
+ if (data_len < 2)
+ goto parse_error;
+
+ /* data should contain a uint16 length followed by a series of 8-bit,
+ * length-prefixed strings. */
+ i = ((unsigned) data[0]) << 8 |
+ ((unsigned) data[1]);
+ data_len -= 2;
+ data += 2;
+ if (data_len != i)
+ goto parse_error;
+
+ if (data_len < 2)
+ goto parse_error;
+
+ for (i = 0; i < data_len;)
+ {
+ proto_len = data[i];
+ i++;
+
+ if (proto_len == 0)
+ goto parse_error;
+
+ if (i + proto_len < i || i + proto_len > data_len)
+ goto parse_error;
+
+ i += proto_len;
+ }
+
+ r = s->ctx->alpn_select_cb(s, &selected, &selected_len, data, data_len,
+ s->ctx->alpn_select_cb_arg);
+ if (r == SSL_TLSEXT_ERR_OK) {
+ if (s->s3->alpn_selected)
+ OPENSSL_free(s->s3->alpn_selected);
+ s->s3->alpn_selected = OPENSSL_malloc(selected_len);
+ if (!s->s3->alpn_selected)
+ {
+ *al = SSL_AD_INTERNAL_ERROR;
+ return -1;
+ }
+ memcpy(s->s3->alpn_selected, selected, selected_len);
+ s->s3->alpn_selected_len = selected_len;
+ }
+ return 0;
+
+parse_error:
+ *al = SSL_AD_DECODE_ERROR;
+ return -1;
+ }
+
+#ifndef OPENSSL_NO_EC
+/* ssl_check_for_safari attempts to fingerprint Safari using OS X
+ * SecureTransport using the TLS extension block in |d|, of length |n|.
+ * Safari, since 10.6, sends exactly these extensions, in this order:
+ * SNI,
+ * elliptic_curves
+ * ec_point_formats
+ *
+ * We wish to fingerprint Safari because they broke ECDHE-ECDSA support in 10.8,
+ * but they advertise support. So enabling ECDHE-ECDSA ciphers breaks them.
+ * Sadly we cannot differentiate 10.6, 10.7 and 10.8.4 (which work), from
+ * 10.8..10.8.3 (which don't work).
+ */
+static void ssl_check_for_safari(SSL *s, const unsigned char *data, const unsigned char *d, int n) {
+ unsigned short type, size;
+ static const unsigned char kSafariExtensionsBlock[] = {
+ 0x00, 0x0a, /* elliptic_curves extension */
+ 0x00, 0x08, /* 8 bytes */
+ 0x00, 0x06, /* 6 bytes of curve ids */
+ 0x00, 0x17, /* P-256 */
+ 0x00, 0x18, /* P-384 */
+ 0x00, 0x19, /* P-521 */
+
+ 0x00, 0x0b, /* ec_point_formats */
+ 0x00, 0x02, /* 2 bytes */
+ 0x01, /* 1 point format */
+ 0x00, /* uncompressed */
+ };
+
+ /* The following is only present in TLS 1.2 */
+ static const unsigned char kSafariTLS12ExtensionsBlock[] = {
+ 0x00, 0x0d, /* signature_algorithms */
+ 0x00, 0x0c, /* 12 bytes */
+ 0x00, 0x0a, /* 10 bytes */
+ 0x05, 0x01, /* SHA-384/RSA */
+ 0x04, 0x01, /* SHA-256/RSA */
+ 0x02, 0x01, /* SHA-1/RSA */
+ 0x04, 0x03, /* SHA-256/ECDSA */
+ 0x02, 0x03, /* SHA-1/ECDSA */
+ };
+
+ if (data >= (d+n-2))
+ return;
+ data += 2;
+
+ if (data > (d+n-4))
+ return;
+ n2s(data,type);
+ n2s(data,size);
+
+ if (type != TLSEXT_TYPE_server_name)
+ return;
+
+ if (data+size > d+n)
+ return;
+ data += size;
+
+ if (TLS1_get_client_version(s) >= TLS1_2_VERSION)
+ {
+ const size_t len1 = sizeof(kSafariExtensionsBlock);
+ const size_t len2 = sizeof(kSafariTLS12ExtensionsBlock);
+
+ if (data + len1 + len2 != d+n)
+ return;
+ if (memcmp(data, kSafariExtensionsBlock, len1) != 0)
+ return;
+ if (memcmp(data + len1, kSafariTLS12ExtensionsBlock, len2) != 0)
+ return;
+ }
+ else
+ {
+ const size_t len = sizeof(kSafariExtensionsBlock);
+
+ if (data + len != d+n)
+ return;
+ if (memcmp(data, kSafariExtensionsBlock, len) != 0)
+ return;
+ }
+
+ s->s3->is_probably_safari = 1;
+}
+#endif /* !OPENSSL_NO_EC */
+
+static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
+ {
+ unsigned short type;
+ unsigned short size;
+ unsigned short len;
+ unsigned char *data = *p;
+ int renegotiate_seen = 0;
+ size_t i;
+
+ s->servername_done = 0;
+ s->tlsext_status_type = -1;
+#ifndef OPENSSL_NO_NEXTPROTONEG
+ s->s3->next_proto_neg_seen = 0;
+#endif
+
+ if (s->s3->alpn_selected)
+ {
+ OPENSSL_free(s->s3->alpn_selected);
+ s->s3->alpn_selected = NULL;
+ }
+
+ /* Clear observed custom extensions */
+ s->s3->serverinfo_client_tlsext_custom_types_count = 0;
+ if (s->s3->serverinfo_client_tlsext_custom_types != NULL)
+ {
+ OPENSSL_free(s->s3->serverinfo_client_tlsext_custom_types);
+ s->s3->serverinfo_client_tlsext_custom_types = NULL;
+ }
+
+#ifndef OPENSSL_NO_HEARTBEATS
+ s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
+ SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
+#endif
+
+#ifndef OPENSSL_NO_EC
+ if (s->options & SSL_OP_SAFARI_ECDHE_ECDSA_BUG)
+ ssl_check_for_safari(s, data, d, n);
+#endif /* !OPENSSL_NO_EC */
+
+ /* Clear any signature algorithms extension received */
+ if (s->cert->peer_sigalgs)
+ {
+ OPENSSL_free(s->cert->peer_sigalgs);
+ s->cert->peer_sigalgs = NULL;
+ }
+ /* Clear any shared sigtnature algorithms */
+ if (s->cert->shared_sigalgs)
+ {
+ OPENSSL_free(s->cert->shared_sigalgs);
+ s->cert->shared_sigalgs = NULL;
+ }
+ /* Clear certificate digests and validity flags */
+ for (i = 0; i < SSL_PKEY_NUM; i++)
+ {
+ s->cert->pkeys[i].digest = NULL;
+ s->cert->pkeys[i].valid_flags = 0;
+ }
+
+#ifdef TLSEXT_TYPE_encrypt_then_mac
+ s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
+#endif
+
+ if (data >= (d+n-2))
+ goto ri_check;
+ n2s(data,len);
+
+ if (data > (d+n-len))
+ goto ri_check;
+
+ while (data <= (d+n-4))
+ {
+ n2s(data,type);
+ n2s(data,size);
+
+ if (data+size > (d+n))
+ goto ri_check;
+#if 0
+ fprintf(stderr,"Received extension type %d size %d\n",type,size);
+#endif
+ if (s->tlsext_debug_cb)
+ s->tlsext_debug_cb(s, 0, type, data, size,
+ s->tlsext_debug_arg);
+/* The servername extension is treated as follows:
+
+ - Only the hostname type is supported with a maximum length of 255.
+ - The servername is rejected if too long or if it contains zeros,
+ in which case an fatal alert is generated.
+ - The servername field is maintained together with the session cache.
+ - When a session is resumed, the servername call back invoked in order
+ to allow the application to position itself to the right context.
+ - The servername is acknowledged if it is new for a session or when
+ it is identical to a previously used for the same session.
+ Applications can control the behaviour. They can at any time
+ set a 'desirable' servername for a new SSL object. This can be the
+ case for example with HTTPS when a Host: header field is received and
+ a renegotiation is requested. In this case, a possible servername
+ presented in the new client hello is only acknowledged if it matches
+ the value of the Host: field.
+ - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
+ if they provide for changing an explicit servername context for the session,
+ i.e. when the session has been established with a servername extension.
+ - On session reconnect, the servername extension may be absent.
+
+*/
+
+ if (type == TLSEXT_TYPE_server_name)
+ {
+ unsigned char *sdata;
+ int servname_type;
+ int dsize;
+
+ if (size < 2)
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+ n2s(data,dsize);
+ size -= 2;
+ if (dsize > size )
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+
+ sdata = data;
+ while (dsize > 3)
+ {
+ servname_type = *(sdata++);
+ n2s(sdata,len);
+ dsize -= 3;
+
+ if (len > dsize)
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+ if (s->servername_done == 0)
+ switch (servname_type)
+ {
+ case TLSEXT_NAMETYPE_host_name:
+ if (!s->hit)
+ {
+ if(s->session->tlsext_hostname)
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+ if (len > TLSEXT_MAXLEN_host_name)
+ {
+ *al = TLS1_AD_UNRECOGNIZED_NAME;
+ return 0;
+ }
+ if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)
+ {
+ *al = TLS1_AD_INTERNAL_ERROR;
+ return 0;
+ }
+ memcpy(s->session->tlsext_hostname, sdata, len);
+ s->session->tlsext_hostname[len]='\0';
+ if (strlen(s->session->tlsext_hostname) != len) {
+ OPENSSL_free(s->session->tlsext_hostname);
+ s->session->tlsext_hostname = NULL;
+ *al = TLS1_AD_UNRECOGNIZED_NAME;
+ return 0;
+ }
+ s->servername_done = 1;
+
+ }
+ else
+ s->servername_done = s->session->tlsext_hostname
+ && strlen(s->session->tlsext_hostname) == len
+ && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
+
+ break;
+
+ default:
+ break;
+ }
+
+ dsize -= len;
+ }
+ if (dsize != 0)
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+
+ }
+#ifndef OPENSSL_NO_SRP
+ else if (type == TLSEXT_TYPE_srp)
+ {
+ if (size <= 0 || ((len = data[0])) != (size -1))
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+ if (s->srp_ctx.login != NULL)
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+ if ((s->srp_ctx.login = OPENSSL_malloc(len+1)) == NULL)
+ return -1;
+ memcpy(s->srp_ctx.login, &data[1], len);
+ s->srp_ctx.login[len]='\0';
+
+ if (strlen(s->srp_ctx.login) != len)
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+ }
+#endif
+
+#ifndef OPENSSL_NO_EC
+ else if (type == TLSEXT_TYPE_ec_point_formats)
+ {
+ unsigned char *sdata = data;
+ int ecpointformatlist_length = *(sdata++);
+
+ if (ecpointformatlist_length != size - 1 ||
+ ecpointformatlist_length < 1)
+ {
+ *al = TLS1_AD_DECODE_ERROR;
+ return 0;
+ }
+ if (!s->hit)
+ {
+ if(s->session->tlsext_ecpointformatlist)
+ {
+ OPENSSL_free(s->session->tlsext_ecpointformatlist);
+ s->session->tlsext_ecpointformatlist = NULL;
+ }
+ s->session->tlsext_ecpointformatlist_length = 0;
+ if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
+ {
+ *al = TLS1_AD_INTERNAL_ERROR;
+ return 0;
+ }
+ s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
+ memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
+ }
+#if 0
+ fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
+ sdata = s->session->tlsext_ecpointformatlist;
+ for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
+ fprintf(stderr,"%i ",*(sdata++));
+ fprintf(stderr,"\n");
+#endif
+ }
+ else if (type == TLSEXT_TYPE_elliptic_curves)
+ {
+ unsigned char *sdata = data;
+ int ellipticcurvelist_length = (*(sdata++) << 8);
+ ellipticcurvelist_length += (*(sdata++));
+
+ if (ellipticcurvelist_length != size - 2 ||
+ ellipticcurvelist_length < 1)
+ {
+ *al = TLS1_AD_DECODE_ERROR;
+ return 0;
+ }
+ if (!s->hit)
+ {
+ if(s->session->tlsext_ellipticcurvelist)
+ {
+ *al = TLS1_AD_DECODE_ERROR;
+ return 0;
+ }
+ s->session->tlsext_ellipticcurvelist_length = 0;
+ if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
+ {
+ *al = TLS1_AD_INTERNAL_ERROR;
+ return 0;
+ }
+ s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
+ memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
+ }
+#if 0
+ fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
+ sdata = s->session->tlsext_ellipticcurvelist;
+ for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
+ fprintf(stderr,"%i ",*(sdata++));
+ fprintf(stderr,"\n");
+#endif
+ }
+#endif /* OPENSSL_NO_EC */
+#ifdef TLSEXT_TYPE_opaque_prf_input
+ else if (type == TLSEXT_TYPE_opaque_prf_input)
+ {
+ unsigned char *sdata = data;
+
+ if (size < 2)
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+ n2s(sdata, s->s3->client_opaque_prf_input_len);
+ if (s->s3->client_opaque_prf_input_len != size - 2)
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+
+ if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
+ OPENSSL_free(s->s3->client_opaque_prf_input);
+ if (s->s3->client_opaque_prf_input_len == 0)
+ s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
+ else
+ s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
+ if (s->s3->client_opaque_prf_input == NULL)
+ {
+ *al = TLS1_AD_INTERNAL_ERROR;
+ return 0;
+ }
+ }
+#endif
+ else if (type == TLSEXT_TYPE_session_ticket)
+ {
+ if (s->tls_session_ticket_ext_cb &&
+ !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
+ {
+ *al = TLS1_AD_INTERNAL_ERROR;
+ return 0;
+ }
+ }
+ else if (type == TLSEXT_TYPE_renegotiate)
+ {
+ if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
+ return 0;
+ renegotiate_seen = 1;
+ }
+ else if (type == TLSEXT_TYPE_signature_algorithms)
+ {
+ int dsize;
+ if (s->cert->peer_sigalgs || size < 2)
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+ n2s(data,dsize);
+ size -= 2;
+ if (dsize != size || dsize & 1 || !dsize)
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+ if (!tls1_process_sigalgs(s, data, dsize))
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+ /* If sigalgs received and no shared algorithms fatal
+ * error.
+ */
+ if (s->cert->peer_sigalgs && !s->cert->shared_sigalgs)
+ {
+ SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
+ SSL_R_NO_SHARED_SIGATURE_ALGORITHMS);
+ *al = SSL_AD_ILLEGAL_PARAMETER;
+ return 0;
+ }
+ }
+ else if (type == TLSEXT_TYPE_status_request)
+ {
+
+ if (size < 5)
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+
+ s->tlsext_status_type = *data++;
+ size--;
+ if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
+ {
+ const unsigned char *sdata;
+ int dsize;
+ /* Read in responder_id_list */
+ n2s(data,dsize);
+ size -= 2;
+ if (dsize > size )
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+ while (dsize > 0)
+ {
+ OCSP_RESPID *id;
+ int idsize;
+ if (dsize < 4)
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+ n2s(data, idsize);
+ dsize -= 2 + idsize;
+ size -= 2 + idsize;
+ if (dsize < 0)
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+ sdata = data;
+ data += idsize;
+ id = d2i_OCSP_RESPID(NULL,
+ &sdata, idsize);
+ if (!id)
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+ if (data != sdata)
+ {
+ OCSP_RESPID_free(id);
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+ if (!s->tlsext_ocsp_ids
+ && !(s->tlsext_ocsp_ids =
+ sk_OCSP_RESPID_new_null()))
+ {
+ OCSP_RESPID_free(id);
+ *al = SSL_AD_INTERNAL_ERROR;
+ return 0;
+ }
+ if (!sk_OCSP_RESPID_push(
+ s->tlsext_ocsp_ids, id))
+ {
+ OCSP_RESPID_free(id);
+ *al = SSL_AD_INTERNAL_ERROR;
+ return 0;
+ }
+ }
+
+ /* Read in request_extensions */
+ if (size < 2)
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+ n2s(data,dsize);
+ size -= 2;
+ if (dsize != size)
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+ sdata = data;
+ if (dsize > 0)
+ {
+ if (s->tlsext_ocsp_exts)
+ {
+ sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
+ X509_EXTENSION_free);
+ }
+
+ s->tlsext_ocsp_exts =
+ d2i_X509_EXTENSIONS(NULL,
+ &sdata, dsize);
+ if (!s->tlsext_ocsp_exts
+ || (data + dsize != sdata))
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+ }
+ }
+ /* We don't know what to do with any other type
+ * so ignore it.
+ */
+ else
+ s->tlsext_status_type = -1;
+ }
+#ifndef OPENSSL_NO_HEARTBEATS
+ else if (type == TLSEXT_TYPE_heartbeat)
+ {
+ switch(data[0])
+ {
+ case 0x01: /* Client allows us to send HB requests */
+ s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
+ break;
+ case 0x02: /* Client doesn't accept HB requests */
+ s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
+ s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
+ break;
+ default: *al = SSL_AD_ILLEGAL_PARAMETER;
+ return 0;
+ }
+ }
+#endif
+#ifndef OPENSSL_NO_NEXTPROTONEG
+ else if (type == TLSEXT_TYPE_next_proto_neg &&
+ s->s3->tmp.finish_md_len == 0 &&
+ s->s3->alpn_selected == NULL)
+ {
+ /* We shouldn't accept this extension on a
+ * renegotiation.
+ *
+ * s->new_session will be set on renegotiation, but we
+ * probably shouldn't rely that it couldn't be set on
+ * the initial renegotation too in certain cases (when
+ * there's some other reason to disallow resuming an
+ * earlier session -- the current code won't be doing
+ * anything like that, but this might change).
+
+ * A valid sign that there's been a previous handshake
+ * in this connection is if s->s3->tmp.finish_md_len >
+ * 0. (We are talking about a check that will happen
+ * in the Hello protocol round, well before a new
+ * Finished message could have been computed.) */
+ s->s3->next_proto_neg_seen = 1;
+ }
+#endif
+
+ else if (type == TLSEXT_TYPE_application_layer_protocol_negotiation &&
+ s->ctx->alpn_select_cb &&
+ s->s3->tmp.finish_md_len == 0)
+ {
+ if (tls1_alpn_handle_client_hello(s, data, size, al) != 0)
+ return 0;
+#ifndef OPENSSL_NO_NEXTPROTONEG
+ /* ALPN takes precedence over NPN. */
+ s->s3->next_proto_neg_seen = 0;
+#endif
+ }
+
+ /* session ticket processed earlier */
+ else if (type == TLSEXT_TYPE_use_srtp)
+ {
+ if(ssl_parse_clienthello_use_srtp_ext(s, data, size,
+ al))
+ return 0;
+ }
+ /* If this ClientHello extension was unhandled and this is
+ * a nonresumed connection, check whether the extension is a
+ * custom TLS Extension (has a custom_srv_ext_record), and if
+ * so call the callback and record the extension number so that
+ * an appropriate ServerHello may be later returned.
+ */
+ else if (!s->hit && s->ctx->custom_srv_ext_records_count)
+ {
+ custom_srv_ext_record *record;
+
+ for (i=0; i < s->ctx->custom_srv_ext_records_count; i++)
+ {
+ record = &s->ctx->custom_srv_ext_records[i];
+ if (type == record->ext_type)
+ {
+ if (record->fn1 && !record->fn1(s, type, data, size, al, record->arg))
+ return 0;
+ }
+ }
+ }
+#ifdef TLSEXT_TYPE_encrypt_then_mac
+ else if (type == TLSEXT_TYPE_encrypt_then_mac)
+ s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
+#endif
+
+ data+=size;
+ }
+
+ *p = data;
+
+ ri_check:
+
+ /* Need RI if renegotiating */
+
+ if (!renegotiate_seen && s->renegotiate &&
+ !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
+ {
+ *al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
+ SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
+ return 0;
+ }
+ /* If no signature algorithms extension set default values */
+ if (!s->cert->peer_sigalgs)
+ ssl_cert_set_default_md(s->cert);
+
+ return 1;
+ }
+
+int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
+ {
+ int al = -1;
+ if (ssl_scan_clienthello_tlsext(s, p, d, n, &al) <= 0)
+ {
+ ssl3_send_alert(s,SSL3_AL_FATAL,al);
+ return 0;
+ }
+
+ if (ssl_check_clienthello_tlsext_early(s) <= 0)
+ {
+ SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,SSL_R_CLIENTHELLO_TLSEXT);
+ return 0;
+ }
+ return 1;
+}
+
+#ifndef OPENSSL_NO_NEXTPROTONEG
+/* ssl_next_proto_validate validates a Next Protocol Negotiation block. No
+ * elements of zero length are allowed and the set of elements must exactly fill
+ * the length of the block. */
+static char ssl_next_proto_validate(unsigned char *d, unsigned len)
+ {
+ unsigned int off = 0;
+
+ while (off < len)
+ {
+ if (d[off] == 0)
+ return 0;
+ off += d[off];
+ off++;
+ }
+
+ return off == len;
+ }
+#endif
+
+static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
+ {
+ unsigned short length;
+ unsigned short type;
+ unsigned short size;
+ unsigned char *data = *p;
+ int tlsext_servername = 0;
+ int renegotiate_seen = 0;
+
+#ifndef OPENSSL_NO_NEXTPROTONEG
+ s->s3->next_proto_neg_seen = 0;
+#endif
+
+ if (s->s3->alpn_selected)
+ {
+ OPENSSL_free(s->s3->alpn_selected);
+ s->s3->alpn_selected = NULL;
+ }
+
+#ifndef OPENSSL_NO_HEARTBEATS
+ s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
+ SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
+#endif
+
+#ifdef TLSEXT_TYPE_encrypt_then_mac
+ s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
+#endif
+
+ if (data >= (d+n-2))
+ goto ri_check;
+
+ n2s(data,length);
+ if (data+length != d+n)
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+
+ while(data <= (d+n-4))
+ {
+ n2s(data,type);
+ n2s(data,size);
+
+ if (data+size > (d+n))
+ goto ri_check;
+
+ if (s->tlsext_debug_cb)
+ s->tlsext_debug_cb(s, 1, type, data, size,
+ s->tlsext_debug_arg);
+
+ if (type == TLSEXT_TYPE_server_name)
+ {
+ if (s->tlsext_hostname == NULL || size > 0)
+ {
+ *al = TLS1_AD_UNRECOGNIZED_NAME;
+ return 0;
+ }
+ tlsext_servername = 1;
+ }
+
+#ifndef OPENSSL_NO_EC
+ else if (type == TLSEXT_TYPE_ec_point_formats)
+ {
+ unsigned char *sdata = data;
+ int ecpointformatlist_length = *(sdata++);
+
+ if (ecpointformatlist_length != size - 1)
+ {
+ *al = TLS1_AD_DECODE_ERROR;
+ return 0;
+ }
+ s->session->tlsext_ecpointformatlist_length = 0;
+ if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
+ if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
+ {
+ *al = TLS1_AD_INTERNAL_ERROR;
+ return 0;
+ }
+ s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
+ memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
+#if 0
+ fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
+ sdata = s->session->tlsext_ecpointformatlist;
+ for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
+ fprintf(stderr,"%i ",*(sdata++));
+ fprintf(stderr,"\n");
+#endif
+ }
+#endif /* OPENSSL_NO_EC */
+
+ else if (type == TLSEXT_TYPE_session_ticket)
+ {
+ if (s->tls_session_ticket_ext_cb &&
+ !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
+ {
+ *al = TLS1_AD_INTERNAL_ERROR;
+ return 0;
+ }
+ if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
+ || (size > 0))
+ {
+ *al = TLS1_AD_UNSUPPORTED_EXTENSION;
+ return 0;
+ }
+ s->tlsext_ticket_expected = 1;
+ }
+#ifdef TLSEXT_TYPE_opaque_prf_input
+ else if (type == TLSEXT_TYPE_opaque_prf_input)
+ {
+ unsigned char *sdata = data;
+
+ if (size < 2)
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+ n2s(sdata, s->s3->server_opaque_prf_input_len);
+ if (s->s3->server_opaque_prf_input_len != size - 2)
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+
+ if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
+ OPENSSL_free(s->s3->server_opaque_prf_input);
+ if (s->s3->server_opaque_prf_input_len == 0)
+ s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
+ else
+ s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
+
+ if (s->s3->server_opaque_prf_input == NULL)
+ {
+ *al = TLS1_AD_INTERNAL_ERROR;
+ return 0;
+ }
+ }
+#endif
+ else if (type == TLSEXT_TYPE_status_request)
+ {
+ /* MUST be empty and only sent if we've requested
+ * a status request message.
+ */
+ if ((s->tlsext_status_type == -1) || (size > 0))
+ {
+ *al = TLS1_AD_UNSUPPORTED_EXTENSION;
+ return 0;
+ }
+ /* Set flag to expect CertificateStatus message */
+ s->tlsext_status_expected = 1;
+ }
+#ifndef OPENSSL_NO_NEXTPROTONEG
+ else if (type == TLSEXT_TYPE_next_proto_neg &&
+ s->s3->tmp.finish_md_len == 0)
+ {
+ unsigned char *selected;
+ unsigned char selected_len;
+
+ /* We must have requested it. */
+ if (s->ctx->next_proto_select_cb == NULL)
+ {
+ *al = TLS1_AD_UNSUPPORTED_EXTENSION;
+ return 0;
+ }
+ /* The data must be valid */
+ if (!ssl_next_proto_validate(data, size))
+ {
+ *al = TLS1_AD_DECODE_ERROR;
+ return 0;
+ }
+ if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data, size, s->ctx->next_proto_select_cb_arg) != SSL_TLSEXT_ERR_OK)
+ {
+ *al = TLS1_AD_INTERNAL_ERROR;
+ return 0;
+ }
+ s->next_proto_negotiated = OPENSSL_malloc(selected_len);
+ if (!s->next_proto_negotiated)
+ {
+ *al = TLS1_AD_INTERNAL_ERROR;
+ return 0;
+ }
+ memcpy(s->next_proto_negotiated, selected, selected_len);
+ s->next_proto_negotiated_len = selected_len;
+ s->s3->next_proto_neg_seen = 1;
+ }
+#endif
+
+ else if (type == TLSEXT_TYPE_application_layer_protocol_negotiation)
+ {
+ unsigned len;
+
+ /* We must have requested it. */
+ if (s->alpn_client_proto_list == NULL)
+ {
+ *al = TLS1_AD_UNSUPPORTED_EXTENSION;
+ return 0;
+ }
+ if (size < 4)
+ {
+ *al = TLS1_AD_DECODE_ERROR;
+ return 0;
+ }
+ /* The extension data consists of:
+ * uint16 list_length
+ * uint8 proto_length;
+ * uint8 proto[proto_length]; */
+ len = data[0];
+ len <<= 8;
+ len |= data[1];
+ if (len != (unsigned) size - 2)
+ {
+ *al = TLS1_AD_DECODE_ERROR;
+ return 0;
+ }
+ len = data[2];
+ if (len != (unsigned) size - 3)
+ {
+ *al = TLS1_AD_DECODE_ERROR;
+ return 0;
+ }
+ if (s->s3->alpn_selected)
+ OPENSSL_free(s->s3->alpn_selected);
+ s->s3->alpn_selected = OPENSSL_malloc(len);
+ if (!s->s3->alpn_selected)
+ {
+ *al = TLS1_AD_INTERNAL_ERROR;
+ return 0;
+ }
+ memcpy(s->s3->alpn_selected, data + 3, len);
+ s->s3->alpn_selected_len = len;
+ }
+
+ else if (type == TLSEXT_TYPE_renegotiate)
+ {
+ if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
+ return 0;
+ renegotiate_seen = 1;
+ }
+#ifndef OPENSSL_NO_HEARTBEATS
+ else if (type == TLSEXT_TYPE_heartbeat)
+ {
+ switch(data[0])
+ {
+ case 0x01: /* Server allows us to send HB requests */
+ s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
+ break;
+ case 0x02: /* Server doesn't accept HB requests */
+ s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
+ s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
+ break;
+ default: *al = SSL_AD_ILLEGAL_PARAMETER;
+ return 0;
+ }
+ }
+#endif
+ else if (type == TLSEXT_TYPE_use_srtp)
+ {
+ if(ssl_parse_serverhello_use_srtp_ext(s, data, size,
+ al))
+ return 0;
+ }
+ /* If this extension type was not otherwise handled, but
+ * matches a custom_cli_ext_record, then send it to the c
+ * callback */
+ else if (s->ctx->custom_cli_ext_records_count)
+ {
+ size_t i;
+ custom_cli_ext_record* record;
+
+ for (i = 0; i < s->ctx->custom_cli_ext_records_count; i++)
+ {
+ record = &s->ctx->custom_cli_ext_records[i];
+ if (record->ext_type == type)
+ {
+ if (record->fn2 && !record->fn2(s, type, data, size, al, record->arg))
+ return 0;
+ break;
}
- sdata = data;
- if (dsize > 0)
+ }
+ }
+#ifdef TLSEXT_TYPE_encrypt_then_mac
+ else if (type == TLSEXT_TYPE_encrypt_then_mac)
+ {
+ /* Ignore if inappropriate ciphersuite */
+ if (s->s3->tmp.new_cipher->algorithm_mac != SSL_AEAD)
+ s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
+ }
+#endif
+
+ data += size;
+ }
+
+ if (data != d+n)
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+
+ if (!s->hit && tlsext_servername == 1)
+ {
+ if (s->tlsext_hostname)
+ {
+ if (s->session->tlsext_hostname == NULL)
+ {
+ s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
+ if (!s->session->tlsext_hostname)
+ {
+ *al = SSL_AD_UNRECOGNIZED_NAME;
+ return 0;
+ }
+ }
+ else
+ {
+ *al = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+ }
+ }
+
+ *p = data;
+
+ ri_check:
+
+ /* Determine if we need to see RI. Strictly speaking if we want to
+ * avoid an attack we should *always* see RI even on initial server
+ * hello because the client doesn't see any renegotiation during an
+ * attack. However this would mean we could not connect to any server
+ * which doesn't support RI so for the immediate future tolerate RI
+ * absence on initial connect only.
+ */
+ if (!renegotiate_seen
+ && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
+ && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
+ {
+ *al = SSL_AD_HANDSHAKE_FAILURE;
+ SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT,
+ SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
+ return 0;
+ }
+
+ return 1;
+ }
+
+
+int ssl_prepare_clienthello_tlsext(SSL *s)
+ {
+
+#ifdef TLSEXT_TYPE_opaque_prf_input
+ {
+ int r = 1;
+
+ if (s->ctx->tlsext_opaque_prf_input_callback != 0)
+ {
+ r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
+ if (!r)
+ return -1;
+ }
+
+ if (s->tlsext_opaque_prf_input != NULL)
+ {
+ if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
+ OPENSSL_free(s->s3->client_opaque_prf_input);
+
+ if (s->tlsext_opaque_prf_input_len == 0)
+ s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
+ else
+ s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
+ if (s->s3->client_opaque_prf_input == NULL)
+ {
+ SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
+ return -1;
+ }
+ s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
+ }
+
+ if (r == 2)
+ /* at callback's request, insist on receiving an appropriate server opaque PRF input */
+ s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
+ }
+#endif
+
+ return 1;
+ }
+
+int ssl_prepare_serverhello_tlsext(SSL *s)
+ {
+ return 1;
+ }
+
+static int ssl_check_clienthello_tlsext_early(SSL *s)
+ {
+ int ret=SSL_TLSEXT_ERR_NOACK;
+ int al = SSL_AD_UNRECOGNIZED_NAME;
+
+#ifndef OPENSSL_NO_EC
+ /* The handling of the ECPointFormats extension is done elsewhere, namely in
+ * ssl3_choose_cipher in s3_lib.c.
+ */
+ /* The handling of the EllipticCurves extension is done elsewhere, namely in
+ * ssl3_choose_cipher in s3_lib.c.
+ */
+#endif
+
+ if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
+ ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
+ else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
+ ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
+
+#ifdef TLSEXT_TYPE_opaque_prf_input
+ {
+ /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
+ * but we might be sending an alert in response to the client hello,
+ * so this has to happen here in
+ * ssl_check_clienthello_tlsext_early(). */
+
+ int r = 1;
+
+ if (s->ctx->tlsext_opaque_prf_input_callback != 0)
+ {
+ r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
+ if (!r)
+ {
+ ret = SSL_TLSEXT_ERR_ALERT_FATAL;
+ al = SSL_AD_INTERNAL_ERROR;
+ goto err;
+ }
+ }
+
+ if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
+ OPENSSL_free(s->s3->server_opaque_prf_input);
+ s->s3->server_opaque_prf_input = NULL;
+
+ if (s->tlsext_opaque_prf_input != NULL)
+ {
+ if (s->s3->client_opaque_prf_input != NULL &&
+ s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
+ {
+ /* can only use this extension if we have a server opaque PRF input
+ * of the same length as the client opaque PRF input! */
+
+ if (s->tlsext_opaque_prf_input_len == 0)
+ s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
+ else
+ s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
+ if (s->s3->server_opaque_prf_input == NULL)
{
- s->tlsext_ocsp_exts =
- d2i_X509_EXTENSIONS(NULL,
- &sdata, dsize);
- if (!s->tlsext_ocsp_exts
- || (data + dsize != sdata))
- {
- *al = SSL_AD_DECODE_ERROR;
- return 0;
- }
+ ret = SSL_TLSEXT_ERR_ALERT_FATAL;
+ al = SSL_AD_INTERNAL_ERROR;
+ goto err;
}
+ s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
+ }
+ }
+
+ if (r == 2 && s->s3->server_opaque_prf_input == NULL)
+ {
+ /* The callback wants to enforce use of the extension,
+ * but we can't do that with the client opaque PRF input;
+ * abort the handshake.
+ */
+ ret = SSL_TLSEXT_ERR_ALERT_FATAL;
+ al = SSL_AD_HANDSHAKE_FAILURE;
+ }
+ }
+
+ err:
+#endif
+ switch (ret)
+ {
+ case SSL_TLSEXT_ERR_ALERT_FATAL:
+ ssl3_send_alert(s,SSL3_AL_FATAL,al);
+ return -1;
+
+ case SSL_TLSEXT_ERR_ALERT_WARNING:
+ ssl3_send_alert(s,SSL3_AL_WARNING,al);
+ return 1;
+
+ case SSL_TLSEXT_ERR_NOACK:
+ s->servername_done=0;
+ default:
+ return 1;
+ }
+ }
+
+int ssl_check_clienthello_tlsext_late(SSL *s)
+ {
+ int ret = SSL_TLSEXT_ERR_OK;
+ int al;
+
+ /* If status request then ask callback what to do.
+ * Note: this must be called after servername callbacks in case
+ * the certificate has changed, and must be called after the cipher
+ * has been chosen because this may influence which certificate is sent
+ */
+ if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
+ {
+ int r;
+ CERT_PKEY *certpkey;
+ certpkey = ssl_get_server_send_pkey(s);
+ /* If no certificate can't return certificate status */
+ if (certpkey == NULL)
+ {
+ s->tlsext_status_expected = 0;
+ return 1;
+ }
+ /* Set current certificate to one we will use so
+ * SSL_get_certificate et al can pick it up.
+ */
+ s->cert->key = certpkey;
+ r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
+ switch (r)
+ {
+ /* We don't want to send a status request response */
+ case SSL_TLSEXT_ERR_NOACK:
+ s->tlsext_status_expected = 0;
+ break;
+ /* status request response should be sent */
+ case SSL_TLSEXT_ERR_OK:
+ if (s->tlsext_ocsp_resp)
+ s->tlsext_status_expected = 1;
+ else
+ s->tlsext_status_expected = 0;
+ break;
+ /* something bad happened */
+ case SSL_TLSEXT_ERR_ALERT_FATAL:
+ ret = SSL_TLSEXT_ERR_ALERT_FATAL;
+ al = SSL_AD_INTERNAL_ERROR;
+ goto err;
+ }
+ }
+ else
+ s->tlsext_status_expected = 0;
+
+ err:
+ switch (ret)
+ {
+ case SSL_TLSEXT_ERR_ALERT_FATAL:
+ ssl3_send_alert(s, SSL3_AL_FATAL, al);
+ return -1;
+
+ case SSL_TLSEXT_ERR_ALERT_WARNING:
+ ssl3_send_alert(s, SSL3_AL_WARNING, al);
+ return 1;
+
+ default:
+ return 1;
+ }
+ }
+
+int ssl_check_serverhello_tlsext(SSL *s)
+ {
+ int ret=SSL_TLSEXT_ERR_NOACK;
+ int al = SSL_AD_UNRECOGNIZED_NAME;
+
+#ifndef OPENSSL_NO_EC
+ /* If we are client and using an elliptic curve cryptography cipher
+ * suite, then if server returns an EC point formats lists extension
+ * it must contain uncompressed.
+ */
+ unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
+ unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
+ if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
+ (s->session->tlsext_ecpointformatlist != NULL) && (s->session->tlsext_ecpointformatlist_length > 0) &&
+ ((alg_k & (SSL_kECDHE|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
+ {
+ /* we are using an ECC cipher */
+ size_t i;
+ unsigned char *list;
+ int found_uncompressed = 0;
+ list = s->session->tlsext_ecpointformatlist;
+ for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
+ {
+ if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
+ {
+ found_uncompressed = 1;
+ break;
+ }
+ }
+ if (!found_uncompressed)
+ {
+ SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
+ return -1;
+ }
+ }
+ ret = SSL_TLSEXT_ERR_OK;
+#endif /* OPENSSL_NO_EC */
+
+ if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
+ ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
+ else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
+ ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
+
+#ifdef TLSEXT_TYPE_opaque_prf_input
+ if (s->s3->server_opaque_prf_input_len > 0)
+ {
+ /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
+ * So first verify that we really have a value from the server too. */
+
+ if (s->s3->server_opaque_prf_input == NULL)
+ {
+ ret = SSL_TLSEXT_ERR_ALERT_FATAL;
+ al = SSL_AD_HANDSHAKE_FAILURE;
+ }
+
+ /* Anytime the server *has* sent an opaque PRF input, we need to check
+ * that we have a client opaque PRF input of the same size. */
+ if (s->s3->client_opaque_prf_input == NULL ||
+ s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
+ {
+ ret = SSL_TLSEXT_ERR_ALERT_FATAL;
+ al = SSL_AD_ILLEGAL_PARAMETER;
+ }
+ }
+#endif
+
+ /* If we've requested certificate status and we wont get one
+ * tell the callback
+ */
+ if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
+ && s->ctx && s->ctx->tlsext_status_cb)
+ {
+ int r;
+ /* Set resp to NULL, resplen to -1 so callback knows
+ * there is no response.
+ */
+ if (s->tlsext_ocsp_resp)
+ {
+ OPENSSL_free(s->tlsext_ocsp_resp);
+ s->tlsext_ocsp_resp = NULL;
+ }
+ s->tlsext_ocsp_resplen = -1;
+ r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
+ if (r == 0)
+ {
+ al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
+ ret = SSL_TLSEXT_ERR_ALERT_FATAL;
+ }
+ if (r < 0)
+ {
+ al = SSL_AD_INTERNAL_ERROR;
+ ret = SSL_TLSEXT_ERR_ALERT_FATAL;
+ }
+ }
+
+ switch (ret)
+ {
+ case SSL_TLSEXT_ERR_ALERT_FATAL:
+ ssl3_send_alert(s,SSL3_AL_FATAL,al);
+ return -1;
+
+ case SSL_TLSEXT_ERR_ALERT_WARNING:
+ ssl3_send_alert(s,SSL3_AL_WARNING,al);
+ return 1;
+
+ case SSL_TLSEXT_ERR_NOACK:
+ s->servername_done=0;
+ default:
+ return 1;
+ }
+ }
+
+int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
+ {
+ int al = -1;
+ if (s->version < SSL3_VERSION)
+ return 1;
+ if (ssl_scan_serverhello_tlsext(s, p, d, n, &al) <= 0)
+ {
+ ssl3_send_alert(s,SSL3_AL_FATAL,al);
+ return 0;
+ }
+
+ if (ssl_check_serverhello_tlsext(s) <= 0)
+ {
+ SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,SSL_R_SERVERHELLO_TLSEXT);
+ return 0;
+ }
+ return 1;
+}
+
+/* Since the server cache lookup is done early on in the processing of the
+ * ClientHello, and other operations depend on the result, we need to handle
+ * any TLS session ticket extension at the same time.
+ *
+ * session_id: points at the session ID in the ClientHello. This code will
+ * read past the end of this in order to parse out the session ticket
+ * extension, if any.
+ * len: the length of the session ID.
+ * limit: a pointer to the first byte after the ClientHello.
+ * ret: (output) on return, if a ticket was decrypted, then this is set to
+ * point to the resulting session.
+ *
+ * If s->tls_session_secret_cb is set then we are expecting a pre-shared key
+ * ciphersuite, in which case we have no use for session tickets and one will
+ * never be decrypted, nor will s->tlsext_ticket_expected be set to 1.
+ *
+ * Returns:
+ * -1: fatal error, either from parsing or decrypting the ticket.
+ * 0: no ticket was found (or was ignored, based on settings).
+ * 1: a zero length extension was found, indicating that the client supports
+ * session tickets but doesn't currently have one to offer.
+ * 2: either s->tls_session_secret_cb was set, or a ticket was offered but
+ * couldn't be decrypted because of a non-fatal error.
+ * 3: a ticket was successfully decrypted and *ret was set.
+ *
+ * Side effects:
+ * Sets s->tlsext_ticket_expected to 1 if the server will have to issue
+ * a new session ticket to the client because the client indicated support
+ * (and s->tls_session_secret_cb is NULL) but the client either doesn't have
+ * a session ticket or we couldn't use the one it gave us, or if
+ * s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket.
+ * Otherwise, s->tlsext_ticket_expected is set to 0.
+ */
+int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
+ const unsigned char *limit, SSL_SESSION **ret)
+ {
+ /* Point after session ID in client hello */
+ const unsigned char *p = session_id + len;
+ unsigned short i;
+
+ *ret = NULL;
+ s->tlsext_ticket_expected = 0;
+
+ /* If tickets disabled behave as if no ticket present
+ * to permit stateful resumption.
+ */
+ if (SSL_get_options(s) & SSL_OP_NO_TICKET)
+ return 0;
+ if ((s->version <= SSL3_VERSION) || !limit)
+ return 0;
+ if (p >= limit)
+ return -1;
+ /* Skip past DTLS cookie */
+ if (SSL_IS_DTLS(s))
+ {
+ i = *(p++);
+ p+= i;
+ if (p >= limit)
+ return -1;
+ }
+ /* Skip past cipher list */
+ n2s(p, i);
+ p+= i;
+ if (p >= limit)
+ return -1;
+ /* Skip past compression algorithm list */
+ i = *(p++);
+ p += i;
+ if (p > limit)
+ return -1;
+ /* Now at start of extensions */
+ if ((p + 2) >= limit)
+ return 0;
+ n2s(p, i);
+ while ((p + 4) <= limit)
+ {
+ unsigned short type, size;
+ n2s(p, type);
+ n2s(p, size);
+ if (p + size > limit)
+ return 0;
+ if (type == TLSEXT_TYPE_session_ticket)
+ {
+ int r;
+ if (size == 0)
+ {
+ /* The client will accept a ticket but doesn't
+ * currently have one. */
+ s->tlsext_ticket_expected = 1;
+ return 1;
+ }
+ if (s->tls_session_secret_cb)
+ {
+ /* Indicate that the ticket couldn't be
+ * decrypted rather than generating the session
+ * from ticket now, trigger abbreviated
+ * handshake based on external mechanism to
+ * calculate the master secret later. */
+ return 2;
+ }
+ r = tls_decrypt_ticket(s, p, size, session_id, len, ret);
+ switch (r)
+ {
+ case 2: /* ticket couldn't be decrypted */
+ s->tlsext_ticket_expected = 1;
+ return 2;
+ case 3: /* ticket was decrypted */
+ return r;
+ case 4: /* ticket decrypted but need to renew */
+ s->tlsext_ticket_expected = 1;
+ return 3;
+ default: /* fatal error */
+ return -1;
}
- /* We don't know what to do with any other type
- * so ignore it.
- */
- else
- s->tlsext_status_type = -1;
}
-
- /* session ticket processed earlier */
- data+=size;
+ p += size;
}
-
- *p = data;
- return 1;
+ return 0;
}
-int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
+/* tls_decrypt_ticket attempts to decrypt a session ticket.
+ *
+ * etick: points to the body of the session ticket extension.
+ * eticklen: the length of the session tickets extenion.
+ * sess_id: points at the session ID.
+ * sesslen: the length of the session ID.
+ * psess: (output) on return, if a ticket was decrypted, then this is set to
+ * point to the resulting session.
+ *
+ * Returns:
+ * -1: fatal error, either from parsing or decrypting the ticket.
+ * 2: the ticket couldn't be decrypted.
+ * 3: a ticket was successfully decrypted and *psess was set.
+ * 4: same as 3, but the ticket needs to be renewed.
+ */
+static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
+ const unsigned char *sess_id, int sesslen,
+ SSL_SESSION **psess)
{
- unsigned short type;
- unsigned short size;
- unsigned short len;
- unsigned char *data = *p;
+ SSL_SESSION *sess;
+ unsigned char *sdec;
+ const unsigned char *p;
+ int slen, mlen, renew_ticket = 0;
+ unsigned char tick_hmac[EVP_MAX_MD_SIZE];
+ HMAC_CTX hctx;
+ EVP_CIPHER_CTX ctx;
+ SSL_CTX *tctx = s->initial_ctx;
+ /* Need at least keyname + iv + some encrypted data */
+ if (eticklen < 48)
+ return 2;
+ /* Initialize session ticket encryption and HMAC contexts */
+ HMAC_CTX_init(&hctx);
+ EVP_CIPHER_CTX_init(&ctx);
+ if (tctx->tlsext_ticket_key_cb)
+ {
+ unsigned char *nctick = (unsigned char *)etick;
+ int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
+ &ctx, &hctx, 0);
+ if (rv < 0)
+ return -1;
+ if (rv == 0)
+ return 2;
+ if (rv == 2)
+ renew_ticket = 1;
+ }
+ else
+ {
+ /* Check key name matches */
+ if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
+ return 2;
+ HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
+ tlsext_tick_md(), NULL);
+ EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
+ tctx->tlsext_tick_aes_key, etick + 16);
+ }
+ /* Attempt to process session ticket, first conduct sanity and
+ * integrity checks on ticket.
+ */
+ mlen = HMAC_size(&hctx);
+ if (mlen < 0)
+ {
+ EVP_CIPHER_CTX_cleanup(&ctx);
+ return -1;
+ }
+ eticklen -= mlen;
+ /* Check HMAC of encrypted ticket */
+ HMAC_Update(&hctx, etick, eticklen);
+ HMAC_Final(&hctx, tick_hmac, NULL);
+ HMAC_CTX_cleanup(&hctx);
+ if (CRYPTO_memcmp(tick_hmac, etick + eticklen, mlen))
+ return 2;
+ /* Attempt to decrypt session data */
+ /* Move p after IV to start of encrypted ticket, update length */
+ p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
+ eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
+ sdec = OPENSSL_malloc(eticklen);
+ if (!sdec)
+ {
+ EVP_CIPHER_CTX_cleanup(&ctx);
+ return -1;
+ }
+ EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
+ if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
+ return 2;
+ slen += mlen;
+ EVP_CIPHER_CTX_cleanup(&ctx);
+ p = sdec;
- int tlsext_servername = 0;
+ sess = d2i_SSL_SESSION(NULL, &p, slen);
+ OPENSSL_free(sdec);
+ if (sess)
+ {
+ /* The session ID, if non-empty, is used by some clients to
+ * detect that the ticket has been accepted. So we copy it to
+ * the session structure. If it is empty set length to zero
+ * as required by standard.
+ */
+ if (sesslen)
+ memcpy(sess->session_id, sess_id, sesslen);
+ sess->session_id_length = sesslen;
+ *psess = sess;
+ if (renew_ticket)
+ return 4;
+ else
+ return 3;
+ }
+ ERR_clear_error();
+ /* For session parse failure, indicate that we need to send a new
+ * ticket. */
+ return 2;
+ }
- if (data >= (d+n-2))
- return 1;
+/* Tables to translate from NIDs to TLS v1.2 ids */
- n2s(data,len);
+typedef struct
+ {
+ int nid;
+ int id;
+ } tls12_lookup;
- while(data <= (d+n-4))
- {
- n2s(data,type);
- n2s(data,size);
+static tls12_lookup tls12_md[] = {
+ {NID_md5, TLSEXT_hash_md5},
+ {NID_sha1, TLSEXT_hash_sha1},
+ {NID_sha224, TLSEXT_hash_sha224},
+ {NID_sha256, TLSEXT_hash_sha256},
+ {NID_sha384, TLSEXT_hash_sha384},
+ {NID_sha512, TLSEXT_hash_sha512}
+};
- if (data+size > (d+n))
- return 1;
+static tls12_lookup tls12_sig[] = {
+ {EVP_PKEY_RSA, TLSEXT_signature_rsa},
+ {EVP_PKEY_DSA, TLSEXT_signature_dsa},
+ {EVP_PKEY_EC, TLSEXT_signature_ecdsa}
+};
- if (s->tlsext_debug_cb)
- s->tlsext_debug_cb(s, 1, type, data, size,
- s->tlsext_debug_arg);
+static int tls12_find_id(int nid, tls12_lookup *table, size_t tlen)
+ {
+ size_t i;
+ for (i = 0; i < tlen; i++)
+ {
+ if (table[i].nid == nid)
+ return table[i].id;
+ }
+ return -1;
+ }
- if (type == TLSEXT_TYPE_server_name)
- {
- if (s->tlsext_hostname == NULL || size > 0)
- {
- *al = TLS1_AD_UNRECOGNIZED_NAME;
- return 0;
- }
- tlsext_servername = 1;
- }
+static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen)
+ {
+ size_t i;
+ for (i = 0; i < tlen; i++)
+ {
+ if ((table[i].id) == id)
+ return table[i].nid;
+ }
+ return NID_undef;
+ }
-#ifndef OPENSSL_NO_EC
- else if (type == TLSEXT_TYPE_ec_point_formats)
- {
- unsigned char *sdata = data;
- int ecpointformatlist_length = *(sdata++);
+int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md)
+ {
+ int sig_id, md_id;
+ if (!md)
+ return 0;
+ md_id = tls12_find_id(EVP_MD_type(md), tls12_md,
+ sizeof(tls12_md)/sizeof(tls12_lookup));
+ if (md_id == -1)
+ return 0;
+ sig_id = tls12_get_sigid(pk);
+ if (sig_id == -1)
+ return 0;
+ p[0] = (unsigned char)md_id;
+ p[1] = (unsigned char)sig_id;
+ return 1;
+ }
- if (ecpointformatlist_length != size - 1)
- {
- *al = TLS1_AD_DECODE_ERROR;
- return 0;
- }
- s->session->tlsext_ecpointformatlist_length = 0;
- if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
- if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
- {
- *al = TLS1_AD_INTERNAL_ERROR;
- return 0;
- }
- s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
- memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
-#if 0
- fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
- sdata = s->session->tlsext_ecpointformatlist;
- for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
- fprintf(stderr,"%i ",*(sdata++));
- fprintf(stderr,"\n");
-#endif
- }
-#endif /* OPENSSL_NO_EC */
+int tls12_get_sigid(const EVP_PKEY *pk)
+ {
+ return tls12_find_id(pk->type, tls12_sig,
+ sizeof(tls12_sig)/sizeof(tls12_lookup));
+ }
- else if (type == TLSEXT_TYPE_session_ticket)
- {
- if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
- || (size > 0))
- {
- *al = TLS1_AD_UNSUPPORTED_EXTENSION;
- return 0;
- }
- s->tlsext_ticket_expected = 1;
- }
-#ifdef TLSEXT_TYPE_opaque_prf_input
- else if (type == TLSEXT_TYPE_opaque_prf_input)
- {
- unsigned char *sdata = data;
+const EVP_MD *tls12_get_hash(unsigned char hash_alg)
+ {
+ switch(hash_alg)
+ {
+#ifndef OPENSSL_NO_MD5
+ case TLSEXT_hash_md5:
+#ifdef OPENSSL_FIPS
+ if (FIPS_mode())
+ return NULL;
+#endif
+ return EVP_md5();
+#endif
+#ifndef OPENSSL_NO_SHA
+ case TLSEXT_hash_sha1:
+ return EVP_sha1();
+#endif
+#ifndef OPENSSL_NO_SHA256
+ case TLSEXT_hash_sha224:
+ return EVP_sha224();
- if (size < 2)
- {
- *al = SSL_AD_DECODE_ERROR;
- return 0;
- }
- n2s(sdata, s->s3->server_opaque_prf_input_len);
- if (s->s3->server_opaque_prf_input_len != size - 2)
- {
- *al = SSL_AD_DECODE_ERROR;
- return 0;
- }
-
- if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
- OPENSSL_free(s->s3->server_opaque_prf_input);
- if (s->s3->server_opaque_prf_input_len == 0)
- s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
- else
- s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
+ case TLSEXT_hash_sha256:
+ return EVP_sha256();
+#endif
+#ifndef OPENSSL_NO_SHA512
+ case TLSEXT_hash_sha384:
+ return EVP_sha384();
- if (s->s3->server_opaque_prf_input == NULL)
- {
- *al = TLS1_AD_INTERNAL_ERROR;
- return 0;
- }
- }
+ case TLSEXT_hash_sha512:
+ return EVP_sha512();
#endif
- else if (type == TLSEXT_TYPE_status_request)
- {
- /* MUST be empty and only sent if we've requested
- * a status request message.
- */
- if ((s->tlsext_status_type == -1) || (size > 0))
- {
- *al = TLS1_AD_UNSUPPORTED_EXTENSION;
- return 0;
- }
- /* Set flag to expect CertificateStatus message */
- s->tlsext_status_expected = 1;
- }
+ default:
+ return NULL;
- data+=size;
}
+ }
- if (data != d+n)
+static int tls12_get_pkey_idx(unsigned char sig_alg)
+ {
+ switch(sig_alg)
{
- *al = SSL_AD_DECODE_ERROR;
- return 0;
+#ifndef OPENSSL_NO_RSA
+ case TLSEXT_signature_rsa:
+ return SSL_PKEY_RSA_SIGN;
+#endif
+#ifndef OPENSSL_NO_DSA
+ case TLSEXT_signature_dsa:
+ return SSL_PKEY_DSA_SIGN;
+#endif
+#ifndef OPENSSL_NO_ECDSA
+ case TLSEXT_signature_ecdsa:
+ return SSL_PKEY_ECC;
+#endif
}
+ return -1;
+ }
- if (!s->hit && tlsext_servername == 1)
+/* Convert TLS 1.2 signature algorithm extension values into NIDs */
+static void tls1_lookup_sigalg(int *phash_nid, int *psign_nid,
+ int *psignhash_nid, const unsigned char *data)
+ {
+ int sign_nid = 0, hash_nid = 0;
+ if (!phash_nid && !psign_nid && !psignhash_nid)
+ return;
+ if (phash_nid || psignhash_nid)
{
- if (s->tlsext_hostname)
+ hash_nid = tls12_find_nid(data[0], tls12_md,
+ sizeof(tls12_md)/sizeof(tls12_lookup));
+ if (phash_nid)
+ *phash_nid = hash_nid;
+ }
+ if (psign_nid || psignhash_nid)
+ {
+ sign_nid = tls12_find_nid(data[1], tls12_sig,
+ sizeof(tls12_sig)/sizeof(tls12_lookup));
+ if (psign_nid)
+ *psign_nid = sign_nid;
+ }
+ if (psignhash_nid)
+ {
+ if (sign_nid && hash_nid)
+ OBJ_find_sigid_by_algs(psignhash_nid,
+ hash_nid, sign_nid);
+ else
+ *psignhash_nid = NID_undef;
+ }
+ }
+/* Given preference and allowed sigalgs set shared sigalgs */
+static int tls12_do_shared_sigalgs(TLS_SIGALGS *shsig,
+ const unsigned char *pref, size_t preflen,
+ const unsigned char *allow, size_t allowlen)
+ {
+ const unsigned char *ptmp, *atmp;
+ size_t i, j, nmatch = 0;
+ for (i = 0, ptmp = pref; i < preflen; i+=2, ptmp+=2)
+ {
+ /* Skip disabled hashes or signature algorithms */
+ if (tls12_get_hash(ptmp[0]) == NULL)
+ continue;
+ if (tls12_get_pkey_idx(ptmp[1]) == -1)
+ continue;
+ for (j = 0, atmp = allow; j < allowlen; j+=2, atmp+=2)
{
- if (s->session->tlsext_hostname == NULL)
+ if (ptmp[0] == atmp[0] && ptmp[1] == atmp[1])
{
- s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
- if (!s->session->tlsext_hostname)
+ nmatch++;
+ if (shsig)
{
- *al = SSL_AD_UNRECOGNIZED_NAME;
- return 0;
+ shsig->rhash = ptmp[0];
+ shsig->rsign = ptmp[1];
+ tls1_lookup_sigalg(&shsig->hash_nid,
+ &shsig->sign_nid,
+ &shsig->signandhash_nid,
+ ptmp);
+ shsig++;
}
- }
- else
- {
- *al = SSL_AD_DECODE_ERROR;
- return 0;
+ break;
}
}
}
+ return nmatch;
+ }
- *p = data;
+/* Set shared signature algorithms for SSL structures */
+static int tls1_set_shared_sigalgs(SSL *s)
+ {
+ const unsigned char *pref, *allow, *conf;
+ size_t preflen, allowlen, conflen;
+ size_t nmatch;
+ TLS_SIGALGS *salgs = NULL;
+ CERT *c = s->cert;
+ unsigned int is_suiteb = tls1_suiteb(s);
+ if (c->shared_sigalgs)
+ {
+ OPENSSL_free(c->shared_sigalgs);
+ c->shared_sigalgs = NULL;
+ }
+ /* If client use client signature algorithms if not NULL */
+ if (!s->server && c->client_sigalgs && !is_suiteb)
+ {
+ conf = c->client_sigalgs;
+ conflen = c->client_sigalgslen;
+ }
+ else if (c->conf_sigalgs && !is_suiteb)
+ {
+ conf = c->conf_sigalgs;
+ conflen = c->conf_sigalgslen;
+ }
+ else
+ conflen = tls12_get_psigalgs(s, &conf);
+ if(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE || is_suiteb)
+ {
+ pref = conf;
+ preflen = conflen;
+ allow = c->peer_sigalgs;
+ allowlen = c->peer_sigalgslen;
+ }
+ else
+ {
+ allow = conf;
+ allowlen = conflen;
+ pref = c->peer_sigalgs;
+ preflen = c->peer_sigalgslen;
+ }
+ nmatch = tls12_do_shared_sigalgs(NULL, pref, preflen, allow, allowlen);
+ if (!nmatch)
+ return 1;
+ salgs = OPENSSL_malloc(nmatch * sizeof(TLS_SIGALGS));
+ if (!salgs)
+ return 0;
+ nmatch = tls12_do_shared_sigalgs(salgs, pref, preflen, allow, allowlen);
+ c->shared_sigalgs = salgs;
+ c->shared_sigalgslen = nmatch;
return 1;
}
+
+/* Set preferred digest for each key type */
-int ssl_prepare_clienthello_tlsext(SSL *s)
+int tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize)
{
-#ifndef OPENSSL_NO_EC
- /* If we are client and using an elliptic curve cryptography cipher suite, send the point formats
- * and elliptic curves we support.
- */
- int using_ecc = 0;
- int i;
- unsigned char *j;
- unsigned long alg_k, alg_a;
- STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
+ int idx;
+ size_t i;
+ const EVP_MD *md;
+ CERT *c = s->cert;
+ TLS_SIGALGS *sigptr;
+ /* Extension ignored for inappropriate versions */
+ if (!SSL_USE_SIGALGS(s))
+ return 1;
+ /* Should never happen */
+ if (!c)
+ return 0;
- for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
- {
- SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
+ if (c->peer_sigalgs)
+ OPENSSL_free(c->peer_sigalgs);
+ c->peer_sigalgs = OPENSSL_malloc(dsize);
+ if (!c->peer_sigalgs)
+ return 0;
+ c->peer_sigalgslen = dsize;
+ memcpy(c->peer_sigalgs, data, dsize);
- alg_k = c->algorithm_mkey;
- alg_a = c->algorithm_auth;
- if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe) || (alg_a & SSL_aECDSA)))
+ tls1_set_shared_sigalgs(s);
+
+#ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
+ if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
+ {
+ /* Use first set signature preference to force message
+ * digest, ignoring any peer preferences.
+ */
+ const unsigned char *sigs = NULL;
+ if (s->server)
+ sigs = c->conf_sigalgs;
+ else
+ sigs = c->client_sigalgs;
+ if (sigs)
{
- using_ecc = 1;
- break;
+ idx = tls12_get_pkey_idx(sigs[1]);
+ md = tls12_get_hash(sigs[0]);
+ c->pkeys[idx].digest = md;
+ c->pkeys[idx].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
+ if (idx == SSL_PKEY_RSA_SIGN)
+ {
+ c->pkeys[SSL_PKEY_RSA_ENC].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
+ c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
+ }
}
}
- using_ecc = using_ecc && (s->version == TLS1_VERSION);
- if (using_ecc)
+#endif
+
+ for (i = 0, sigptr = c->shared_sigalgs;
+ i < c->shared_sigalgslen; i++, sigptr++)
{
- if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
- if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
+ idx = tls12_get_pkey_idx(sigptr->rsign);
+ if (idx > 0 && c->pkeys[idx].digest == NULL)
{
- SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
- return -1;
+ md = tls12_get_hash(sigptr->rhash);
+ c->pkeys[idx].digest = md;
+ c->pkeys[idx].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
+ if (idx == SSL_PKEY_RSA_SIGN)
+ {
+ c->pkeys[SSL_PKEY_RSA_ENC].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
+ c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
+ }
}
- s->tlsext_ecpointformatlist_length = 3;
- s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
- s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
- s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
- /* we support all named elliptic curves in draft-ietf-tls-ecc-12 */
- if (s->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->tlsext_ellipticcurvelist);
- s->tlsext_ellipticcurvelist_length = sizeof(nid_list)/sizeof(nid_list[0]) * 2;
- if ((s->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL)
- {
- s->tlsext_ellipticcurvelist_length = 0;
- SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
- return -1;
- }
- for (i = 1, j = s->tlsext_ellipticcurvelist; i <= sizeof(nid_list)/sizeof(nid_list[0]); i++)
- s2n(i,j);
}
-#endif /* OPENSSL_NO_EC */
-
-#ifdef TLSEXT_TYPE_opaque_prf_input
- {
- int r = 1;
-
- if (s->ctx->tlsext_opaque_prf_input_callback != 0)
+ /* In strict mode leave unset digests as NULL to indicate we can't
+ * use the certificate for signing.
+ */
+ if (!(s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT))
+ {
+ /* Set any remaining keys to default values. NOTE: if alg is
+ * not supported it stays as NULL.
+ */
+#ifndef OPENSSL_NO_DSA
+ if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest)
+ c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_sha1();
+#endif
+#ifndef OPENSSL_NO_RSA
+ if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest)
{
- r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
- if (!r)
- return -1;
+ c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1();
+ c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1();
}
+#endif
+#ifndef OPENSSL_NO_ECDSA
+ if (!c->pkeys[SSL_PKEY_ECC].digest)
+ c->pkeys[SSL_PKEY_ECC].digest = EVP_sha1();
+#endif
+ }
+ return 1;
+ }
- if (s->tlsext_opaque_prf_input != NULL)
- {
- if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
- OPENSSL_free(s->s3->client_opaque_prf_input);
-
- if (s->tlsext_opaque_prf_input_len == 0)
- s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
- else
- s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
- if (s->s3->client_opaque_prf_input == NULL)
- {
- SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
- return -1;
- }
- s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
- }
- if (r == 2)
- /* at callback's request, insist on receiving an appropriate server opaque PRF input */
- s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
+int SSL_get_sigalgs(SSL *s, int idx,
+ int *psign, int *phash, int *psignhash,
+ unsigned char *rsig, unsigned char *rhash)
+ {
+ const unsigned char *psig = s->cert->peer_sigalgs;
+ if (psig == NULL)
+ return 0;
+ if (idx >= 0)
+ {
+ idx <<= 1;
+ if (idx >= (int)s->cert->peer_sigalgslen)
+ return 0;
+ psig += idx;
+ if (rhash)
+ *rhash = psig[0];
+ if (rsig)
+ *rsig = psig[1];
+ tls1_lookup_sigalg(phash, psign, psignhash, psig);
+ }
+ return s->cert->peer_sigalgslen / 2;
}
-#endif
- return 1;
+int SSL_get_shared_sigalgs(SSL *s, int idx,
+ int *psign, int *phash, int *psignhash,
+ unsigned char *rsig, unsigned char *rhash)
+ {
+ TLS_SIGALGS *shsigalgs = s->cert->shared_sigalgs;
+ if (!shsigalgs || idx >= (int)s->cert->shared_sigalgslen)
+ return 0;
+ shsigalgs += idx;
+ if (phash)
+ *phash = shsigalgs->hash_nid;
+ if (psign)
+ *psign = shsigalgs->sign_nid;
+ if (psignhash)
+ *psignhash = shsigalgs->signandhash_nid;
+ if (rsig)
+ *rsig = shsigalgs->rsign;
+ if (rhash)
+ *rhash = shsigalgs->rhash;
+ return s->cert->shared_sigalgslen;
}
+
-int ssl_prepare_serverhello_tlsext(SSL *s)
+#ifndef OPENSSL_NO_HEARTBEATS
+int
+tls1_process_heartbeat(SSL *s)
{
-#ifndef OPENSSL_NO_EC
- /* If we are server and using an ECC cipher suite, send the point formats we support
- * if the client sent us an ECPointsFormat extension. Note that the server is not
- * supposed to send an EllipticCurves extension.
- */
+ unsigned char *p = &s->s3->rrec.data[0], *pl;
+ unsigned short hbtype;
+ unsigned int payload;
+ unsigned int padding = 16; /* Use minimum padding */
- unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
- unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
- int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
- using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
-
- if (using_ecc)
+ /* Read type and payload length first */
+ hbtype = *p++;
+ n2s(p, payload);
+ pl = p;
+
+ if (s->msg_callback)
+ s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT,
+ &s->s3->rrec.data[0], s->s3->rrec.length,
+ s, s->msg_callback_arg);
+
+ if (hbtype == TLS1_HB_REQUEST)
+ {
+ unsigned char *buffer, *bp;
+ int r;
+
+ /* Allocate memory for the response, size is 1 bytes
+ * message type, plus 2 bytes payload length, plus
+ * payload, plus padding
+ */
+ buffer = OPENSSL_malloc(1 + 2 + payload + padding);
+ bp = buffer;
+
+ /* Enter response type, length and copy payload */
+ *bp++ = TLS1_HB_RESPONSE;
+ s2n(payload, bp);
+ memcpy(bp, pl, payload);
+ bp += payload;
+ /* Random padding */
+ RAND_pseudo_bytes(bp, padding);
+
+ r = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, 3 + payload + padding);
+
+ if (r >= 0 && s->msg_callback)
+ s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
+ buffer, 3 + payload + padding,
+ s, s->msg_callback_arg);
+
+ OPENSSL_free(buffer);
+
+ if (r < 0)
+ return r;
+ }
+ else if (hbtype == TLS1_HB_RESPONSE)
{
- if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
- if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
+ unsigned int seq;
+
+ /* We only send sequence numbers (2 bytes unsigned int),
+ * and 16 random bytes, so we just try to read the
+ * sequence number */
+ n2s(pl, seq);
+
+ if (payload == 18 && seq == s->tlsext_hb_seq)
{
- SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
- return -1;
+ s->tlsext_hb_seq++;
+ s->tlsext_hb_pending = 0;
}
- s->tlsext_ecpointformatlist_length = 3;
- s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
- s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
- s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
}
-#endif /* OPENSSL_NO_EC */
- return 1;
+ return 0;
}
-int ssl_check_clienthello_tlsext(SSL *s)
+int
+tls1_heartbeat(SSL *s)
{
- int ret=SSL_TLSEXT_ERR_NOACK;
- int al = SSL_AD_UNRECOGNIZED_NAME;
+ unsigned char *buf, *p;
+ int ret;
+ unsigned int payload = 18; /* Sequence number + random bytes */
+ unsigned int padding = 16; /* Use minimum padding */
-#ifndef OPENSSL_NO_EC
- /* The handling of the ECPointFormats extension is done elsewhere, namely in
- * ssl3_choose_cipher in s3_lib.c.
- */
- /* The handling of the EllipticCurves extension is done elsewhere, namely in
- * ssl3_choose_cipher in s3_lib.c.
+ /* Only send if peer supports and accepts HB requests... */
+ if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
+ s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS)
+ {
+ SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
+ return -1;
+ }
+
+ /* ...and there is none in flight yet... */
+ if (s->tlsext_hb_pending)
+ {
+ SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PENDING);
+ return -1;
+ }
+
+ /* ...and no handshake in progress. */
+ if (SSL_in_init(s) || s->in_handshake)
+ {
+ SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_UNEXPECTED_MESSAGE);
+ return -1;
+ }
+
+ /* Check if padding is too long, payload and padding
+ * must not exceed 2^14 - 3 = 16381 bytes in total.
*/
-#endif
+ OPENSSL_assert(payload + padding <= 16381);
- if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
- ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
- else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
- ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
+ /* Create HeartBeat message, we just use a sequence number
+ * as payload to distuingish different messages and add
+ * some random stuff.
+ * - Message Type, 1 byte
+ * - Payload Length, 2 bytes (unsigned int)
+ * - Payload, the sequence number (2 bytes uint)
+ * - Payload, random bytes (16 bytes uint)
+ * - Padding
+ */
+ buf = OPENSSL_malloc(1 + 2 + payload + padding);
+ p = buf;
+ /* Message Type */
+ *p++ = TLS1_HB_REQUEST;
+ /* Payload length (18 bytes here) */
+ s2n(payload, p);
+ /* Sequence number */
+ s2n(s->tlsext_hb_seq, p);
+ /* 16 random bytes */
+ RAND_pseudo_bytes(p, 16);
+ p += 16;
+ /* Random padding */
+ RAND_pseudo_bytes(p, padding);
- /* If status request then ask callback what to do.
- * Note: this must be called after servername callbacks in case
- * the certificate has changed.
- */
- if ((s->tlsext_status_type != -1) && s->ctx->tlsext_status_cb)
+ ret = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
+ if (ret >= 0)
{
- int r;
- r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
- switch (r)
- {
- /* We don't want to send a status request response */
- case SSL_TLSEXT_ERR_NOACK:
- s->tlsext_status_expected = 0;
- break;
- /* status request response should be sent */
- case SSL_TLSEXT_ERR_OK:
- if (s->tlsext_ocsp_resp)
- s->tlsext_status_expected = 1;
- else
- s->tlsext_status_expected = 0;
- break;
- /* something bad happened */
- case SSL_TLSEXT_ERR_ALERT_FATAL:
- ret = SSL_TLSEXT_ERR_ALERT_FATAL;
- al = SSL_AD_INTERNAL_ERROR;
- goto err;
- }
+ if (s->msg_callback)
+ s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
+ buf, 3 + payload + padding,
+ s, s->msg_callback_arg);
+
+ s->tlsext_hb_pending = 1;
}
- else
- s->tlsext_status_expected = 0;
+
+ OPENSSL_free(buf);
-#ifdef TLSEXT_TYPE_opaque_prf_input
- {
- /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
- * but we might be sending an alert in response to the client hello,
- * so this has to happen here in ssl_check_clienthello_tlsext(). */
+ return ret;
+ }
+#endif
- int r = 1;
-
- if (s->ctx->tlsext_opaque_prf_input_callback != 0)
- {
- r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
- if (!r)
- {
- ret = SSL_TLSEXT_ERR_ALERT_FATAL;
- al = SSL_AD_INTERNAL_ERROR;
- goto err;
- }
- }
+#define MAX_SIGALGLEN (TLSEXT_hash_num * TLSEXT_signature_num * 2)
- if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
- OPENSSL_free(s->s3->server_opaque_prf_input);
- s->s3->server_opaque_prf_input = NULL;
+typedef struct
+ {
+ size_t sigalgcnt;
+ int sigalgs[MAX_SIGALGLEN];
+ } sig_cb_st;
- if (s->tlsext_opaque_prf_input != NULL)
- {
- if (s->s3->client_opaque_prf_input != NULL &&
- s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
- {
- /* can only use this extension if we have a server opaque PRF input
- * of the same length as the client opaque PRF input! */
+static int sig_cb(const char *elem, int len, void *arg)
+ {
+ sig_cb_st *sarg = arg;
+ size_t i;
+ char etmp[20], *p;
+ int sig_alg, hash_alg;
+ if (sarg->sigalgcnt == MAX_SIGALGLEN)
+ return 0;
+ if (len > (int)(sizeof(etmp) - 1))
+ return 0;
+ memcpy(etmp, elem, len);
+ etmp[len] = 0;
+ p = strchr(etmp, '+');
+ if (!p)
+ return 0;
+ *p = 0;
+ p++;
+ if (!*p)
+ return 0;
- if (s->tlsext_opaque_prf_input_len == 0)
- s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
- else
- s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
- if (s->s3->server_opaque_prf_input == NULL)
- {
- ret = SSL_TLSEXT_ERR_ALERT_FATAL;
- al = SSL_AD_INTERNAL_ERROR;
- goto err;
- }
- s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
- }
- }
+ if (!strcmp(etmp, "RSA"))
+ sig_alg = EVP_PKEY_RSA;
+ else if (!strcmp(etmp, "DSA"))
+ sig_alg = EVP_PKEY_DSA;
+ else if (!strcmp(etmp, "ECDSA"))
+ sig_alg = EVP_PKEY_EC;
+ else return 0;
- if (r == 2 && s->s3->server_opaque_prf_input == NULL)
- {
- /* The callback wants to enforce use of the extension,
- * but we can't do that with the client opaque PRF input;
- * abort the handshake.
- */
- ret = SSL_TLSEXT_ERR_ALERT_FATAL;
- al = SSL_AD_HANDSHAKE_FAILURE;
- }
+ hash_alg = OBJ_sn2nid(p);
+ if (hash_alg == NID_undef)
+ hash_alg = OBJ_ln2nid(p);
+ if (hash_alg == NID_undef)
+ return 0;
+
+ for (i = 0; i < sarg->sigalgcnt; i+=2)
+ {
+ if (sarg->sigalgs[i] == sig_alg
+ && sarg->sigalgs[i + 1] == hash_alg)
+ return 0;
+ }
+ sarg->sigalgs[sarg->sigalgcnt++] = hash_alg;
+ sarg->sigalgs[sarg->sigalgcnt++] = sig_alg;
+ return 1;
}
-#endif
- err:
- switch (ret)
+/* Set suppored signature algorithms based on a colon separated list
+ * of the form sig+hash e.g. RSA+SHA512:DSA+SHA512 */
+int tls1_set_sigalgs_list(CERT *c, const char *str, int client)
+ {
+ sig_cb_st sig;
+ sig.sigalgcnt = 0;
+ if (!CONF_parse_list(str, ':', 1, sig_cb, &sig))
+ return 0;
+ if (c == NULL)
+ return 1;
+ return tls1_set_sigalgs(c, sig.sigalgs, sig.sigalgcnt, client);
+ }
+
+int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client)
+ {
+ unsigned char *sigalgs, *sptr;
+ int rhash, rsign;
+ size_t i;
+ if (salglen & 1)
+ return 0;
+ sigalgs = OPENSSL_malloc(salglen);
+ if (sigalgs == NULL)
+ return 0;
+ for (i = 0, sptr = sigalgs; i < salglen; i+=2)
{
- case SSL_TLSEXT_ERR_ALERT_FATAL:
- ssl3_send_alert(s,SSL3_AL_FATAL,al);
- return -1;
+ rhash = tls12_find_id(*psig_nids++, tls12_md,
+ sizeof(tls12_md)/sizeof(tls12_lookup));
+ rsign = tls12_find_id(*psig_nids++, tls12_sig,
+ sizeof(tls12_sig)/sizeof(tls12_lookup));
- case SSL_TLSEXT_ERR_ALERT_WARNING:
- ssl3_send_alert(s,SSL3_AL_WARNING,al);
- return 1;
-
- case SSL_TLSEXT_ERR_NOACK:
- s->servername_done=0;
- default:
+ if (rhash == -1 || rsign == -1)
+ goto err;
+ *sptr++ = rhash;
+ *sptr++ = rsign;
+ }
+
+ if (client)
+ {
+ if (c->client_sigalgs)
+ OPENSSL_free(c->client_sigalgs);
+ c->client_sigalgs = sigalgs;
+ c->client_sigalgslen = salglen;
+ }
+ else
+ {
+ if (c->conf_sigalgs)
+ OPENSSL_free(c->conf_sigalgs);
+ c->conf_sigalgs = sigalgs;
+ c->conf_sigalgslen = salglen;
+ }
+
+ return 1;
+
+ err:
+ OPENSSL_free(sigalgs);
+ return 0;
+ }
+
+static int tls1_check_sig_alg(CERT *c, X509 *x, int default_nid)
+ {
+ int sig_nid;
+ size_t i;
+ if (default_nid == -1)
return 1;
+ sig_nid = X509_get_signature_nid(x);
+ if (default_nid)
+ return sig_nid == default_nid ? 1 : 0;
+ for (i = 0; i < c->shared_sigalgslen; i++)
+ if (sig_nid == c->shared_sigalgs[i].signandhash_nid)
+ return 1;
+ return 0;
+ }
+/* Check to see if a certificate issuer name matches list of CA names */
+static int ssl_check_ca_name(STACK_OF(X509_NAME) *names, X509 *x)
+ {
+ X509_NAME *nm;
+ int i;
+ nm = X509_get_issuer_name(x);
+ for (i = 0; i < sk_X509_NAME_num(names); i++)
+ {
+ if(!X509_NAME_cmp(nm, sk_X509_NAME_value(names, i)))
+ return 1;
}
+ return 0;
}
-int ssl_check_serverhello_tlsext(SSL *s)
- {
- int ret=SSL_TLSEXT_ERR_NOACK;
- int al = SSL_AD_UNRECOGNIZED_NAME;
+/* Check certificate chain is consistent with TLS extensions and is
+ * usable by server. This servers two purposes: it allows users to
+ * check chains before passing them to the server and it allows the
+ * server to check chains before attempting to use them.
+ */
-#ifndef OPENSSL_NO_EC
- /* If we are client and using an elliptic curve cryptography cipher suite, then server
- * must return a an EC point formats lists containing uncompressed.
- */
- unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
- unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
- if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
- ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
+/* Flags which need to be set for a certificate when stict mode not set */
+
+#define CERT_PKEY_VALID_FLAGS \
+ (CERT_PKEY_EE_SIGNATURE|CERT_PKEY_EE_PARAM)
+/* Strict mode flags */
+#define CERT_PKEY_STRICT_FLAGS \
+ (CERT_PKEY_VALID_FLAGS|CERT_PKEY_CA_SIGNATURE|CERT_PKEY_CA_PARAM \
+ | CERT_PKEY_ISSUER_NAME|CERT_PKEY_CERT_TYPE)
+
+int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain,
+ int idx)
+ {
+ int i;
+ int rv = 0;
+ int check_flags = 0, strict_mode;
+ CERT_PKEY *cpk = NULL;
+ CERT *c = s->cert;
+ unsigned int suiteb_flags = tls1_suiteb(s);
+ /* idx == -1 means checking server chains */
+ if (idx != -1)
{
- /* we are using an ECC cipher */
- size_t i;
- unsigned char *list;
- int found_uncompressed = 0;
- if ((s->session->tlsext_ecpointformatlist == NULL) || (s->session->tlsext_ecpointformatlist_length == 0))
+ /* idx == -2 means checking client certificate chains */
+ if (idx == -2)
{
- SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
- return -1;
+ cpk = c->key;
+ idx = cpk - c->pkeys;
}
- list = s->session->tlsext_ecpointformatlist;
- for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
+ else
+ cpk = c->pkeys + idx;
+ x = cpk->x509;
+ pk = cpk->privatekey;
+ chain = cpk->chain;
+ strict_mode = c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT;
+ /* If no cert or key, forget it */
+ if (!x || !pk)
+ goto end;
+#ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
+ /* Allow any certificate to pass test */
+ if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
{
- if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
- {
- found_uncompressed = 1;
- break;
- }
+ rv = CERT_PKEY_STRICT_FLAGS|CERT_PKEY_EXPLICIT_SIGN|CERT_PKEY_VALID|CERT_PKEY_SIGN;
+ cpk->valid_flags = rv;
+ return rv;
}
- if (!found_uncompressed)
+#endif
+ }
+ else
+ {
+ if (!x || !pk)
+ goto end;
+ idx = ssl_cert_type(x, pk);
+ if (idx == -1)
+ goto end;
+ cpk = c->pkeys + idx;
+ if (c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)
+ check_flags = CERT_PKEY_STRICT_FLAGS;
+ else
+ check_flags = CERT_PKEY_VALID_FLAGS;
+ strict_mode = 1;
+ }
+
+ if (suiteb_flags)
+ {
+ int ok;
+ if (check_flags)
+ check_flags |= CERT_PKEY_SUITEB;
+ ok = X509_chain_check_suiteb(NULL, x, chain, suiteb_flags);
+ if (ok != X509_V_OK)
{
- SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
- return -1;
+ if (check_flags)
+ rv |= CERT_PKEY_SUITEB;
+ else
+ goto end;
}
}
- ret = SSL_TLSEXT_ERR_OK;
-#endif /* OPENSSL_NO_EC */
-
- if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
- ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
- else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
- ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
-#ifdef TLSEXT_TYPE_opaque_prf_input
- if (s->s3->server_opaque_prf_input_len > 0)
+ /* Check all signature algorithms are consistent with
+ * signature algorithms extension if TLS 1.2 or later
+ * and strict mode.
+ */
+ if (TLS1_get_version(s) >= TLS1_2_VERSION && strict_mode)
{
- /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
- * So first verify that we really have a value from the server too. */
+ int default_nid;
+ unsigned char rsign = 0;
+ if (c->peer_sigalgs)
+ default_nid = 0;
+ /* If no sigalgs extension use defaults from RFC5246 */
+ else
+ {
+ switch(idx)
+ {
+ case SSL_PKEY_RSA_ENC:
+ case SSL_PKEY_RSA_SIGN:
+ case SSL_PKEY_DH_RSA:
+ rsign = TLSEXT_signature_rsa;
+ default_nid = NID_sha1WithRSAEncryption;
+ break;
- if (s->s3->server_opaque_prf_input == NULL)
+ case SSL_PKEY_DSA_SIGN:
+ case SSL_PKEY_DH_DSA:
+ rsign = TLSEXT_signature_dsa;
+ default_nid = NID_dsaWithSHA1;
+ break;
+
+ case SSL_PKEY_ECC:
+ rsign = TLSEXT_signature_ecdsa;
+ default_nid = NID_ecdsa_with_SHA1;
+ break;
+
+ default:
+ default_nid = -1;
+ break;
+ }
+ }
+ /* If peer sent no signature algorithms extension and we
+ * have set preferred signature algorithms check we support
+ * sha1.
+ */
+ if (default_nid > 0 && c->conf_sigalgs)
{
- ret = SSL_TLSEXT_ERR_ALERT_FATAL;
- al = SSL_AD_HANDSHAKE_FAILURE;
+ size_t j;
+ const unsigned char *p = c->conf_sigalgs;
+ for (j = 0; j < c->conf_sigalgslen; j += 2, p += 2)
+ {
+ if (p[0] == TLSEXT_hash_sha1 && p[1] == rsign)
+ break;
+ }
+ if (j == c->conf_sigalgslen)
+ {
+ if (check_flags)
+ goto skip_sigs;
+ else
+ goto end;
+ }
}
-
- /* Anytime the server *has* sent an opaque PRF input, we need to check
- * that we have a client opaque PRF input of the same size. */
- if (s->s3->client_opaque_prf_input == NULL ||
- s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
+ /* Check signature algorithm of each cert in chain */
+ if (!tls1_check_sig_alg(c, x, default_nid))
{
- ret = SSL_TLSEXT_ERR_ALERT_FATAL;
- al = SSL_AD_ILLEGAL_PARAMETER;
+ if (!check_flags) goto end;
+ }
+ else
+ rv |= CERT_PKEY_EE_SIGNATURE;
+ rv |= CERT_PKEY_CA_SIGNATURE;
+ for (i = 0; i < sk_X509_num(chain); i++)
+ {
+ if (!tls1_check_sig_alg(c, sk_X509_value(chain, i),
+ default_nid))
+ {
+ if (check_flags)
+ {
+ rv &= ~CERT_PKEY_CA_SIGNATURE;
+ break;
+ }
+ else
+ goto end;
+ }
}
}
-#endif
-
- /* If we've requested certificate status and we wont get one
- * tell the callback
- */
- if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
- && s->ctx->tlsext_status_cb)
+ /* Else not TLS 1.2, so mark EE and CA signing algorithms OK */
+ else if(check_flags)
+ rv |= CERT_PKEY_EE_SIGNATURE|CERT_PKEY_CA_SIGNATURE;
+ skip_sigs:
+ /* Check cert parameters are consistent */
+ if (tls1_check_cert_param(s, x, check_flags ? 1 : 2))
+ rv |= CERT_PKEY_EE_PARAM;
+ else if (!check_flags)
+ goto end;
+ if (!s->server)
+ rv |= CERT_PKEY_CA_PARAM;
+ /* In strict mode check rest of chain too */
+ else if (strict_mode)
{
- int r;
- /* Set resp to NULL, resplen to -1 so callback knows
- * there is no response.
- */
- if (s->tlsext_ocsp_resp)
+ rv |= CERT_PKEY_CA_PARAM;
+ for (i = 0; i < sk_X509_num(chain); i++)
{
- OPENSSL_free(s->tlsext_ocsp_resp);
- s->tlsext_ocsp_resp = NULL;
+ X509 *ca = sk_X509_value(chain, i);
+ if (!tls1_check_cert_param(s, ca, 0))
+ {
+ if (check_flags)
+ {
+ rv &= ~CERT_PKEY_CA_PARAM;
+ break;
+ }
+ else
+ goto end;
+ }
}
- s->tlsext_ocsp_resplen = -1;
- r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
- if (r == 0)
+ }
+ if (!s->server && strict_mode)
+ {
+ STACK_OF(X509_NAME) *ca_dn;
+ int check_type = 0;
+ switch (pk->type)
{
- al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
- ret = SSL_TLSEXT_ERR_ALERT_FATAL;
+ case EVP_PKEY_RSA:
+ check_type = TLS_CT_RSA_SIGN;
+ break;
+ case EVP_PKEY_DSA:
+ check_type = TLS_CT_DSS_SIGN;
+ break;
+ case EVP_PKEY_EC:
+ check_type = TLS_CT_ECDSA_SIGN;
+ break;
+ case EVP_PKEY_DH:
+ case EVP_PKEY_DHX:
+ {
+ int cert_type = X509_certificate_type(x, pk);
+ if (cert_type & EVP_PKS_RSA)
+ check_type = TLS_CT_RSA_FIXED_DH;
+ if (cert_type & EVP_PKS_DSA)
+ check_type = TLS_CT_DSS_FIXED_DH;
+ }
}
- if (r < 0)
+ if (check_type)
{
- al = SSL_AD_INTERNAL_ERROR;
- ret = SSL_TLSEXT_ERR_ALERT_FATAL;
+ const unsigned char *ctypes;
+ int ctypelen;
+ if (c->ctypes)
+ {
+ ctypes = c->ctypes;
+ ctypelen = (int)c->ctype_num;
+ }
+ else
+ {
+ ctypes = (unsigned char *)s->s3->tmp.ctype;
+ ctypelen = s->s3->tmp.ctype_num;
+ }
+ for (i = 0; i < ctypelen; i++)
+ {
+ if (ctypes[i] == check_type)
+ {
+ rv |= CERT_PKEY_CERT_TYPE;
+ break;
+ }
+ }
+ if (!(rv & CERT_PKEY_CERT_TYPE) && !check_flags)
+ goto end;
}
- }
+ else
+ rv |= CERT_PKEY_CERT_TYPE;
- switch (ret)
- {
- case SSL_TLSEXT_ERR_ALERT_FATAL:
- ssl3_send_alert(s,SSL3_AL_FATAL,al);
- return -1;
- case SSL_TLSEXT_ERR_ALERT_WARNING:
- ssl3_send_alert(s,SSL3_AL_WARNING,al);
- return 1;
-
- case SSL_TLSEXT_ERR_NOACK:
- s->servername_done=0;
- default:
- return 1;
- }
- }
+ ca_dn = s->s3->tmp.ca_names;
-/* Since the server cache lookup is done early on in the processing of client
- * hello and other operations depend on the result we need to handle any TLS
- * session ticket extension at the same time.
- */
+ if (!sk_X509_NAME_num(ca_dn))
+ rv |= CERT_PKEY_ISSUER_NAME;
-int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
- const unsigned char *limit, SSL_SESSION **ret)
- {
- /* Point after session ID in client hello */
- const unsigned char *p = session_id + len;
- unsigned short i;
- if ((s->version <= SSL3_VERSION) || !limit)
- return 1;
- if (p >= limit)
- return -1;
- /* Skip past cipher list */
- n2s(p, i);
- p+= i;
- if (p >= limit)
- return -1;
- /* Skip past compression algorithm list */
- i = *(p++);
- p += i;
- if (p > limit)
- return -1;
- /* Now at start of extensions */
- if ((p + 2) >= limit)
- return 1;
- n2s(p, i);
- while ((p + 4) <= limit)
- {
- unsigned short type, size;
- n2s(p, type);
- n2s(p, size);
- if (p + size > limit)
- return 1;
- if (type == TLSEXT_TYPE_session_ticket)
+ if (!(rv & CERT_PKEY_ISSUER_NAME))
{
- /* If tickets disabled indicate cache miss which will
- * trigger a full handshake
- */
- if (SSL_get_options(s) & SSL_OP_NO_TICKET)
- return 0;
- /* If zero length not client will accept a ticket
- * and indicate cache miss to trigger full handshake
- */
- if (size == 0)
+ if (ssl_check_ca_name(ca_dn, x))
+ rv |= CERT_PKEY_ISSUER_NAME;
+ }
+ if (!(rv & CERT_PKEY_ISSUER_NAME))
+ {
+ for (i = 0; i < sk_X509_num(chain); i++)
{
- s->tlsext_ticket_expected = 1;
- return 0; /* Cache miss */
+ X509 *xtmp = sk_X509_value(chain, i);
+ if (ssl_check_ca_name(ca_dn, xtmp))
+ {
+ rv |= CERT_PKEY_ISSUER_NAME;
+ break;
+ }
}
- return tls_decrypt_ticket(s, p, size, session_id, len,
- ret);
}
- p += size;
+ if (!check_flags && !(rv & CERT_PKEY_ISSUER_NAME))
+ goto end;
}
- return 1;
- }
+ else
+ rv |= CERT_PKEY_ISSUER_NAME|CERT_PKEY_CERT_TYPE;
-static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
- const unsigned char *sess_id, int sesslen,
- SSL_SESSION **psess)
- {
- SSL_SESSION *sess;
- unsigned char *sdec;
- const unsigned char *p;
- int slen, mlen;
- unsigned char tick_hmac[EVP_MAX_MD_SIZE];
- HMAC_CTX hctx;
- EVP_CIPHER_CTX ctx;
- /* Attempt to process session ticket, first conduct sanity and
- * integrity checks on ticket.
- */
- mlen = EVP_MD_size(tlsext_tick_md());
- eticklen -= mlen;
- /* Need at least keyname + iv + some encrypted data */
- if (eticklen < 48)
- goto tickerr;
- /* Check key name matches */
- if (memcmp(etick, s->ctx->tlsext_tick_key_name, 16))
- goto tickerr;
- /* Check HMAC of encrypted ticket */
- HMAC_CTX_init(&hctx);
- HMAC_Init_ex(&hctx, s->ctx->tlsext_tick_hmac_key, 16,
- tlsext_tick_md(), NULL);
- HMAC_Update(&hctx, etick, eticklen);
- HMAC_Final(&hctx, tick_hmac, NULL);
- HMAC_CTX_cleanup(&hctx);
- if (memcmp(tick_hmac, etick + eticklen, mlen))
- goto tickerr;
- /* Set p to start of IV */
- p = etick + 16;
- EVP_CIPHER_CTX_init(&ctx);
- /* Attempt to decrypt session data */
- EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
- s->ctx->tlsext_tick_aes_key, p);
- /* Move p after IV to start of encrypted ticket, update length */
- p += 16;
- eticklen -= 32;
- sdec = OPENSSL_malloc(eticklen);
- if (!sdec)
+ if (!check_flags || (rv & check_flags) == check_flags)
+ rv |= CERT_PKEY_VALID;
+
+ end:
+
+ if (TLS1_get_version(s) >= TLS1_2_VERSION)
{
- EVP_CIPHER_CTX_cleanup(&ctx);
- return -1;
+ if (cpk->valid_flags & CERT_PKEY_EXPLICIT_SIGN)
+ rv |= CERT_PKEY_EXPLICIT_SIGN|CERT_PKEY_SIGN;
+ else if (cpk->digest)
+ rv |= CERT_PKEY_SIGN;
}
- EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
- if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
- goto tickerr;
- slen += mlen;
- EVP_CIPHER_CTX_cleanup(&ctx);
- p = sdec;
-
- sess = d2i_SSL_SESSION(NULL, &p, slen);
- OPENSSL_free(sdec);
- if (sess)
+ else
+ rv |= CERT_PKEY_SIGN|CERT_PKEY_EXPLICIT_SIGN;
+
+ /* When checking a CERT_PKEY structure all flags are irrelevant
+ * if the chain is invalid.
+ */
+ if (!check_flags)
{
- /* The session ID if non-empty is used by some clients to
- * detect that the ticket has been accepted. So we copy it to
- * the session structure. If it is empty set length to zero
- * as required by standard.
- */
- if (sesslen)
- memcpy(sess->session_id, sess_id, sesslen);
- sess->session_id_length = sesslen;
- *psess = sess;
- return 1;
+ if (rv & CERT_PKEY_VALID)
+ cpk->valid_flags = rv;
+ else
+ {
+ /* Preserve explicit sign flag, clear rest */
+ cpk->valid_flags &= CERT_PKEY_EXPLICIT_SIGN;
+ return 0;
+ }
}
- /* If session decrypt failure indicate a cache miss and set state to
- * send a new ticket
- */
- tickerr:
- s->tlsext_ticket_expected = 1;
- return 0;
+ return rv;
+ }
+
+/* Set validity of certificates in an SSL structure */
+void tls1_set_cert_validity(SSL *s)
+ {
+ tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_ENC);
+ tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_SIGN);
+ tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DSA_SIGN);
+ tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_RSA);
+ tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_DSA);
+ tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ECC);
+ }
+/* User level utiity function to check a chain is suitable */
+int SSL_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain)
+ {
+ return tls1_check_chain(s, x, pk, chain, -1);
}
#endif
projects / openssl.git / blobdiff