#include <openssl/bn.h>
#include <openssl/md5.h>
+static int tls_construct_encrypted_extensions(SSL *s, WPACKET *pkt);
static STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,
PACKET *cipher_suites,
STACK_OF(SSL_CIPHER)
int *al);
/*
- * server_read_transition() encapsulates the logic for the allowed handshake
- * state transitions when the server is reading messages from the client. The
- * message type that the client has sent is provided in |mt|. The current state
- * is in |s->statem.hand_state|.
+ * ossl_statem_server13_read_transition() encapsulates the logic for the allowed
+ * handshake state transitions when a TLSv1.3 server is reading messages from
+ * the client. The message type that the client has sent is provided in |mt|.
+ * The current state is in |s->statem.hand_state|.
*
- * Valid return values are:
- * 1: Success (transition allowed)
- * 0: Error (transition not allowed)
+ * Return values are 1 for success (transition allowed) and 0 on error
+ * (transition not allowed)
+ */
+static int ossl_statem_server13_read_transition(SSL *s, int mt)
+{
+ OSSL_STATEM *st = &s->statem;
+
+ /*
+ * TODO(TLS1.3): This is still based on the TLSv1.2 state machine. Over time
+ * we will update this to look more like real TLSv1.3
+ */
+
+ /*
+ * Note: There is no case for TLS_ST_BEFORE because at that stage we have
+ * not negotiated TLSv1.3 yet, so that case is handled by
+ * ossl_statem_server_read_transition()
+ */
+ switch (st->hand_state) {
+ default:
+ break;
+
+ case TLS_ST_SW_FINISHED:
+ if (s->s3->tmp.cert_request) {
+ if (mt == SSL3_MT_CERTIFICATE) {
+ st->hand_state = TLS_ST_SR_CERT;
+ return 1;
+ }
+ } else {
+ if (mt == SSL3_MT_FINISHED) {
+ st->hand_state = TLS_ST_SR_FINISHED;
+ return 1;
+ }
+ }
+ break;
+
+ case TLS_ST_SR_CERT:
+ if (s->session->peer == NULL) {
+ if (mt == SSL3_MT_FINISHED) {
+ st->hand_state = TLS_ST_SR_FINISHED;
+ return 1;
+ }
+ } else {
+ if (mt == SSL3_MT_CERTIFICATE_VERIFY) {
+ st->hand_state = TLS_ST_SR_CERT_VRFY;
+ return 1;
+ }
+ }
+ break;
+
+ case TLS_ST_SR_CERT_VRFY:
+ if (mt == SSL3_MT_FINISHED) {
+ st->hand_state = TLS_ST_SR_FINISHED;
+ return 1;
+ }
+ break;
+ }
+
+ /* No valid transition found */
+ ssl3_send_alert(s, SSL3_AL_FATAL, SSL3_AD_UNEXPECTED_MESSAGE);
+ SSLerr(SSL_F_OSSL_STATEM_SERVER13_READ_TRANSITION,
+ SSL_R_UNEXPECTED_MESSAGE);
+ return 0;
+}
+
+/*
+ * ossl_statem_server_read_transition() encapsulates the logic for the allowed
+ * handshake state transitions when the server is reading messages from the
+ * client. The message type that the client has sent is provided in |mt|. The
+ * current state is in |s->statem.hand_state|.
+ *
+ * Return values are 1 for success (transition allowed) and 0 on error
+ * (transition not allowed)
*/
int ossl_statem_server_read_transition(SSL *s, int mt)
{
OSSL_STATEM *st = &s->statem;
+ if (SSL_IS_TLS13(s)) {
+ if (!ossl_statem_server13_read_transition(s, mt))
+ goto err;
+ return 1;
+ }
+
switch (st->hand_state) {
default:
break;
break;
}
+ err:
/* No valid transition found */
ssl3_send_alert(s, SSL3_AL_FATAL, SSL3_AD_UNEXPECTED_MESSAGE);
SSLerr(SSL_F_OSSL_STATEM_SERVER_READ_TRANSITION, SSL_R_UNEXPECTED_MESSAGE);
}
/*
- * server_write_transition() works out what handshake state to move to next
- * when the server is writing messages to be sent to the client.
+ * ossl_statem_server13_write_transition() works out what handshake state to
+ * move to next when a TLSv1.3 server is writing messages to be sent to the
+ * client.
+ */
+static WRITE_TRAN ossl_statem_server13_write_transition(SSL *s)
+{
+ OSSL_STATEM *st = &s->statem;
+
+ /*
+ * TODO(TLS1.3): This is still based on the TLSv1.2 state machine. Over time
+ * we will update this to look more like real TLSv1.3
+ */
+
+ /*
+ * No case for TLS_ST_BEFORE, because at that stage we have not negotiated
+ * TLSv1.3 yet, so that is handled by ossl_statem_server_write_transition()
+ */
+
+ switch (st->hand_state) {
+ default:
+ /* Shouldn't happen */
+ return WRITE_TRAN_ERROR;
+
+ case TLS_ST_SR_CLNT_HELLO:
+ st->hand_state = TLS_ST_SW_SRVR_HELLO;
+ return WRITE_TRAN_CONTINUE;
+
+ case TLS_ST_SW_SRVR_HELLO:
+ st->hand_state = TLS_ST_SW_ENCRYPTED_EXTENSIONS;
+ return WRITE_TRAN_CONTINUE;
+
+ case TLS_ST_SW_ENCRYPTED_EXTENSIONS:
+ if (s->hit)
+ st->hand_state = TLS_ST_SW_FINISHED;
+ else if (send_certificate_request(s))
+ st->hand_state = TLS_ST_SW_CERT_REQ;
+ else
+ st->hand_state = TLS_ST_SW_CERT;
+
+ return WRITE_TRAN_CONTINUE;
+
+ case TLS_ST_SW_CERT_REQ:
+ st->hand_state = TLS_ST_SW_CERT;
+ return WRITE_TRAN_CONTINUE;
+
+ case TLS_ST_SW_CERT:
+ st->hand_state = s->tlsext_status_expected ? TLS_ST_SW_CERT_STATUS
+ : TLS_ST_SW_FINISHED;
+ return WRITE_TRAN_CONTINUE;
+
+ case TLS_ST_SW_CERT_STATUS:
+ st->hand_state = TLS_ST_SW_FINISHED;
+ return WRITE_TRAN_CONTINUE;
+
+ case TLS_ST_SW_FINISHED:
+ return WRITE_TRAN_FINISHED;
+
+ case TLS_ST_SR_FINISHED:
+ st->hand_state = TLS_ST_OK;
+ ossl_statem_set_in_init(s, 0);
+ return WRITE_TRAN_CONTINUE;
+ }
+}
+
+/*
+ * ossl_statem_server_write_transition() works out what handshake state to move
+ * to next when the server is writing messages to be sent to the client.
*/
WRITE_TRAN ossl_statem_server_write_transition(SSL *s)
{
OSSL_STATEM *st = &s->statem;
+ /*
+ * Note that before the ClientHello we don't know what version we are going
+ * to negotiate yet, so we don't take this branch until later
+ */
+
+ if (SSL_IS_TLS13(s))
+ return ossl_statem_server13_write_transition(s);
+
switch (st->hand_state) {
default:
/* Shouldn't happen */
sizeof(sctpauthkey), sctpauthkey);
}
#endif
+ /*
+ * TODO(TLS1.3): This actually causes a problem. We don't yet know
+ * whether the next record we are going to receive is an unencrypted
+ * alert, or an encrypted handshake message. We're going to need
+ * something clever in the record layer for this.
+ */
+ if (SSL_IS_TLS13(s)) {
+ if (!s->method->ssl3_enc->setup_key_block(s)
+ || !s->method->ssl3_enc->change_cipher_state(s,
+ SSL3_CC_HANDSHAKE | SSL3_CHANGE_CIPHER_SERVER_WRITE)
+ || !s->method->ssl3_enc->change_cipher_state(s,
+ SSL3_CC_HANDSHAKE |SSL3_CHANGE_CIPHER_SERVER_READ))
+ return WORK_ERROR;
+ }
break;
case TLS_ST_SW_CHANGE:
0, NULL);
}
#endif
+ if (SSL_IS_TLS13(s)) {
+ if (!s->method->ssl3_enc->generate_master_secret(s,
+ s->session->master_key, s->handshake_secret, 0,
+ &s->session->master_key_length)
+ || !s->method->ssl3_enc->change_cipher_state(s,
+ SSL3_CC_APPLICATION | SSL3_CHANGE_CIPHER_SERVER_WRITE))
+ return WORK_ERROR;
+ }
break;
}
*confunc = tls_construct_finished;
*mt = SSL3_MT_FINISHED;
break;
+
+ case TLS_ST_SW_ENCRYPTED_EXTENSIONS:
+ *confunc = tls_construct_encrypted_extensions;
+ *mt = SSL3_MT_ENCRYPTED_EXTENSIONS;
+ break;
}
return 1;
#endif
return WORK_FINISHED_CONTINUE;
}
-
+ return WORK_FINISHED_CONTINUE;
}
#ifndef OPENSSL_NO_SRP
return 1;
}
+#ifndef OPENSSL_NO_EC
+/*-
+ * ssl_check_for_safari attempts to fingerprint Safari using OS X
+ * SecureTransport using the TLS extension block in |hello|.
+ * 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 CLIENTHELLO_MSG *hello)
+{
+ unsigned int type;
+ PACKET sni, tmppkt;
+ size_t ext_len;
+
+ 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 */
+ 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 */
+ };
+
+ /* Length of the common prefix (first two extensions). */
+ static const size_t kSafariCommonExtensionsLength = 18;
+
+ tmppkt = hello->extensions;
+
+ if (!PACKET_forward(&tmppkt, 2)
+ || !PACKET_get_net_2(&tmppkt, &type)
+ || !PACKET_get_length_prefixed_2(&tmppkt, &sni)) {
+ return;
+ }
+
+ if (type != TLSEXT_TYPE_server_name)
+ return;
+
+ ext_len = TLS1_get_client_version(s) >= TLS1_2_VERSION ?
+ sizeof(kSafariExtensionsBlock) : kSafariCommonExtensionsLength;
+
+ s->s3->is_probably_safari = PACKET_equal(&tmppkt, kSafariExtensionsBlock,
+ ext_len);
+}
+#endif /* !OPENSSL_NO_EC */
+
MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt)
{
int i, al = SSL_AD_INTERNAL_ERROR;
/* Preserve the raw extensions PACKET for later use */
extensions = clienthello.extensions;
- if (!tls_collect_extensions(&extensions, &clienthello.pre_proc_exts,
- &clienthello.num_extensions, &al)) {
+ if (!tls_collect_extensions(s, &extensions, EXT_CLIENT_HELLO,
+ &clienthello.pre_proc_exts, &al)) {
/* SSLerr already been called */
goto f_err;
}
s->hit = 0;
/* We need to do this before getting the session */
- if (!tls_check_client_ems_support(s, &clienthello)) {
- /* Only fails if the extension is malformed */
- al = SSL_AD_DECODE_ERROR;
+ if (!tls_parse_extension(s, TLSEXT_IDX_extended_master_secret,
+ EXT_CLIENT_HELLO,
+ clienthello.pre_proc_exts, &al)) {
SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
goto f_err;
}
goto f_err;
}
+#ifndef OPENSSL_NO_EC
+ if (s->options & SSL_OP_SAFARI_ECDHE_ECDSA_BUG)
+ ssl_check_for_safari(s, &clienthello);
+#endif /* !OPENSSL_NO_EC */
+
/* TLS extensions */
- if (!ssl_parse_clienthello_tlsext(s, &clienthello)) {
+ if (!tls_parse_all_extensions(s, EXT_CLIENT_HELLO,
+ clienthello.pre_proc_exts, &al)) {
SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_PARSE_TLSEXT);
- goto err;
+ goto f_err;
}
/* Check we've got a key_share for TLSv1.3 */
- if (s->version == TLS1_3_VERSION && s->s3->peer_tmp == NULL) {
+ if (SSL_IS_TLS13(s) && s->s3->peer_tmp == NULL && !s->hit) {
/* No suitable share */
- /* TODO(1.3): Send a HelloRetryRequest */
+ /* TODO(TLS1.3): Send a HelloRetryRequest */
al = SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_SUITABLE_KEY_SHARE);
goto f_err;
return MSG_PROCESS_ERROR;
}
+/*
+ * Call the status request callback if needed. Upon success, returns 1.
+ * Upon failure, returns 0 and sets |al| to the appropriate fatal alert.
+ */
+static int tls_handle_status_request(SSL *s, int *al)
+{
+ s->tlsext_status_expected = 0;
+
+ /*
+ * 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 ret;
+ CERT_PKEY *certpkey;
+ certpkey = ssl_get_server_send_pkey(s);
+ /* If no certificate can't return certificate status */
+ if (certpkey != NULL) {
+ /*
+ * Set current certificate to one we will use so SSL_get_certificate
+ * et al can pick it up.
+ */
+ s->cert->key = certpkey;
+ ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
+ switch (ret) {
+ /* 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;
+ break;
+ /* something bad happened */
+ case SSL_TLSEXT_ERR_ALERT_FATAL:
+ default:
+ *al = SSL_AD_INTERNAL_ERROR;
+ return 0;
+ }
+ }
+ }
+
+ return 1;
+}
+
WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst)
{
int al = SSL_AD_HANDSHAKE_FAILURE;
s->s3->tmp.new_cipher = cipher;
/* check whether we should disable session resumption */
if (s->not_resumable_session_cb != NULL)
- s->session->not_resumable = s->not_resumable_session_cb(s,
- ((cipher->algorithm_mkey & (SSL_kDHE | SSL_kECDHE)) != 0));
+ s->session->not_resumable =
+ s->not_resumable_session_cb(s, ((cipher->algorithm_mkey
+ & (SSL_kDHE | SSL_kECDHE))
+ != 0));
if (s->session->not_resumable)
/* do not send a session ticket */
s->tlsext_ticket_expected = 0;
* s->s3->tmp.new_cipher- the new cipher to use.
*/
- /* Handles TLS extensions that we couldn't check earlier */
- if (s->version >= SSL3_VERSION) {
- if (!ssl_check_clienthello_tlsext_late(s, &al)) {
- SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
- SSL_R_CLIENTHELLO_TLSEXT);
- goto f_err;
- }
+ /*
+ * Call status_request callback if needed. Has to be done after the
+ * certificate callbacks etc above.
+ */
+ if (!tls_handle_status_request(s, &al)) {
+ SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
+ SSL_R_CLIENTHELLO_TLSEXT);
+ goto f_err;
}
wst = WORK_MORE_B;
compm = s->s3->tmp.new_compression->id;
#endif
- if (!WPACKET_sub_memcpy_u8(pkt, s->session->session_id, sl)
+ if ((!SSL_IS_TLS13(s)
+ && !WPACKET_sub_memcpy_u8(pkt, s->session->session_id, sl))
|| !s->method->put_cipher_by_char(s->s3->tmp.new_cipher, pkt, &len)
- || !WPACKET_put_bytes_u8(pkt, compm)
- || !ssl_prepare_serverhello_tlsext(s)
- || !ssl_add_serverhello_tlsext(s, pkt, &al)) {
+ || (!SSL_IS_TLS13(s)
+ && !WPACKET_put_bytes_u8(pkt, compm))
+ /*
+ * TODO(TLS1.3): For now we add all 1.2 and 1.3 extensions. Later
+ * we will do this based on the actual protocol
+ */
+ || !tls_construct_extensions(s, pkt,
+ EXT_TLS1_2_SERVER_HELLO
+ | EXT_TLS1_3_SERVER_HELLO
+ | EXT_TLS1_3_ENCRYPTED_EXTENSIONS
+ | EXT_TLS1_3_CERTIFICATE, &al)) {
SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
goto err;
}
return 1;
err:
- ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
+ ssl3_send_alert(s, SSL3_AL_FATAL, al);
return 0;
}
goto err;
}
- if (ssl_derive(s, skey, ckey) == 0) {
+ if (ssl_derive(s, skey, ckey, 1) == 0) {
*al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR);
goto err;
}
}
- if (ssl_derive(s, skey, ckey) == 0) {
+ if (ssl_derive(s, skey, ckey, 1) == 0) {
*al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_INTERNAL_ERROR);
goto err;
al = SSL_AD_INTERNAL_ERROR;
goto f_err;
}
+
#ifdef SSL_DEBUG
fprintf(stderr, "Using client verify alg %s\n", EVP_MD_name(md));
#endif
sk_X509_pop_free(s->session->peer_chain, X509_free);
s->session->peer_chain = sk;
+
+ /*
+ * Freeze the handshake buffer. For <TLS1.3 we do this after the CKE
+ * message
+ */
+ if (SSL_IS_TLS13(s) && !ssl3_digest_cached_records(s, 1)) {
+ al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
+ goto f_err;
+ }
+
/*
* Inconsistency alert: cert_chain does *not* include the peer's own
* certificate, while we do include it in statem_clnt.c
}
#endif
+static int tls_construct_encrypted_extensions(SSL *s, WPACKET *pkt)
+{
+ /* TODO(TLS1.3): Zero length encrypted extensions message for now */
+ if (!WPACKET_put_bytes_u16(pkt, 0)) {
+ SSLerr(SSL_F_TLS_CONSTRUCT_ENCRYPTED_EXTENSIONS, ERR_R_INTERNAL_ERROR);
+ ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
+ return 0;
+ }
+
+ return 1;
+}
+
#define SSLV2_CIPHER_LEN 3
STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,
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