X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=ssl%2Ft1_lib.c;h=9ee7e7d71786f14b176ff7690d7b01500176e273;hp=2eb5bb6745e8b8163fb18d11bde98936faf9b1a2;hb=c2c49969e236058090c081e591272ea325ca49b6;hpb=7c382796bec1c3f734ebe57ecbaf7be7e8fd0b8e diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c index 2eb5bb6745..9ee7e7d717 100644 --- a/ssl/t1_lib.c +++ b/ssl/t1_lib.c @@ -56,7 +56,7 @@ * [including the GNU Public Licence.] */ /* ==================================================================== - * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved. + * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -111,9 +111,18 @@ #include #include +#include +#include +#include #include "ssl_locl.h" -const char *tls1_version_str="TLSv1" OPENSSL_VERSION_PTEXT; +const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT; + +#ifndef OPENSSL_NO_TLSEXT +static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen, + const unsigned char *sess_id, int sesslen, + SSL_SESSION **psess); +#endif SSL3_ENC_METHOD TLSv1_enc_data={ tls1_enc, @@ -145,15 +154,120 @@ int tls1_new(SSL *s) 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_sect163r1, /* sect163r1 (2) */ + NID_sect163r2, /* sect163r2 (3) */ + NID_sect193r1, /* sect193r1 (4) */ + NID_sect193r2, /* sect193r2 (5) */ + NID_sect233k1, /* sect233k1 (6) */ + NID_sect233r1, /* sect233r1 (7) */ + NID_sect239k1, /* sect239k1 (8) */ + NID_sect283k1, /* sect283k1 (9) */ + NID_sect283r1, /* sect283r1 (10) */ + NID_sect409k1, /* sect409k1 (11) */ + NID_sect409r1, /* sect409r1 (12) */ + NID_sect571k1, /* sect571k1 (13) */ + NID_sect571r1, /* sect571r1 (14) */ + NID_secp160k1, /* secp160k1 (15) */ + NID_secp160r1, /* secp160r1 (16) */ + NID_secp160r2, /* secp160r2 (17) */ + NID_secp192k1, /* secp192k1 (18) */ + NID_X9_62_prime192v1, /* secp192r1 (19) */ + NID_secp224k1, /* secp224k1 (20) */ + NID_secp224r1, /* secp224r1 (21) */ + NID_secp256k1, /* secp256k1 (22) */ + NID_X9_62_prime256v1, /* secp256r1 (23) */ + NID_secp384r1, /* secp384r1 (24) */ + NID_secp521r1 /* secp521r1 (25) */ + }; + +int tls1_ec_curve_id2nid(int curve_id) + { + /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */ + if ((curve_id < 1) || ((unsigned int)curve_id > + sizeof(nid_list)/sizeof(nid_list[0]))) + return 0; + return nid_list[curve_id-1]; + } + +int tls1_ec_nid2curve_id(int nid) + { + /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */ + switch (nid) + { + case NID_sect163k1: /* sect163k1 (1) */ + return 1; + case NID_sect163r1: /* sect163r1 (2) */ + return 2; + case NID_sect163r2: /* sect163r2 (3) */ + return 3; + case NID_sect193r1: /* sect193r1 (4) */ + return 4; + case NID_sect193r2: /* sect193r2 (5) */ + return 5; + case NID_sect233k1: /* sect233k1 (6) */ + return 6; + case NID_sect233r1: /* sect233r1 (7) */ + return 7; + case NID_sect239k1: /* sect239k1 (8) */ + return 8; + case NID_sect283k1: /* sect283k1 (9) */ + return 9; + case NID_sect283r1: /* sect283r1 (10) */ + return 10; + case NID_sect409k1: /* sect409k1 (11) */ + return 11; + case NID_sect409r1: /* sect409r1 (12) */ + return 12; + case NID_sect571k1: /* sect571k1 (13) */ + return 13; + case NID_sect571r1: /* sect571r1 (14) */ + return 14; + case NID_secp160k1: /* secp160k1 (15) */ + return 15; + case NID_secp160r1: /* secp160r1 (16) */ + return 16; + case NID_secp160r2: /* secp160r2 (17) */ + return 17; + case NID_secp192k1: /* secp192k1 (18) */ + return 18; + case NID_X9_62_prime192v1: /* secp192r1 (19) */ + return 19; + case NID_secp224k1: /* secp224k1 (20) */ + return 20; + case NID_secp224r1: /* secp224r1 (21) */ + return 21; + case NID_secp256k1: /* secp256k1 (22) */ + return 22; + case NID_X9_62_prime256v1: /* secp256r1 (23) */ + return 23; + case NID_secp384r1: /* secp384r1 (24) */ + return 24; + case NID_secp521r1: /* secp521r1 (25) */ + return 25; + 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) @@ -161,34 +275,86 @@ unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned cha int extdatalen=0; unsigned char *ret = p; + /* 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->servername_done == 0 && s->tlsext_hostname != NULL) + + if (s->tlsext_hostname != NULL) { /* Add TLS extension servername to the Client Hello message */ unsigned long size_str; long lenmax; - if ((lenmax = limit - p - 7) < 0) return NULL; - if ((size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax) return NULL; + /* 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); - s2n(TLSEXT_TYPE_server_name,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->new_session) + { + 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_EC - if (s->tlsext_ecpointformatlist != NULL) + if (s->tlsext_ecpointformatlist != NULL && + s->version != DTLS1_VERSION) { /* Add TLS extension ECPointFormats to the ClientHello message */ long lenmax; - if ((lenmax = limit - p - 5) < 0) return NULL; + 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); @@ -196,53 +362,268 @@ unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned cha memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length); ret+=s->tlsext_ecpointformatlist_length; } + if (s->tlsext_ellipticcurvelist != NULL && + s->version != DTLS1_VERSION) + { + /* 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) + { + SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); + return NULL; + } + + 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->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: + +#ifdef TLSEXT_TYPE_opaque_prf_input + if (s->s3->client_opaque_prf_input != NULL && + s->version != DTLS1_VERSION) + { + 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 && + s->version != DTLS1_VERSION) + { + 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); + } + 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 extdatalen=0; unsigned char *ret = p; + /* 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 (limit - p - 4 < 0) return 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 (s->tlsext_ecpointformatlist != NULL) + if (s->tlsext_ecpointformatlist != NULL && + s->version != DTLS1_VERSION) { /* Add TLS extension ECPointFormats to the ServerHello message */ long lenmax; - if ((lenmax = limit - p - 5) < 0) return NULL; + 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_SERVERHELLO_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; + } + /* 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 && + s->version != DTLS1_VERSION) + { + 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->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; + + } + if ((extdatalen = ret-p-2)== 0) return p; s2n(extdatalen,p); return ret; -} + } int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) { @@ -250,17 +631,17 @@ int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, in unsigned short size; unsigned short len; unsigned char *data = *p; -#if 0 - fprintf(stderr,"ssl_parse_clienthello_tlsext %s\n",s->session->tlsext_hostname?s->session->tlsext_hostname:"NULL"); -#endif + int renegotiate_seen = 0; + s->servername_done = 0; + s->tlsext_status_type = -1; if (data >= (d+n-2)) - return 1; + goto ri_check; n2s(data,len); - if (data > (d+n-len)) - return 1; + if (data > (d+n-len)) + goto ri_check; while (data <= (d+n-4)) { @@ -268,8 +649,13 @@ int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, in n2s(data,size); if (data+size > (d+n)) - return 1; - + 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. @@ -295,24 +681,40 @@ int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, in if (type == TLSEXT_TYPE_server_name) { - unsigned char *sdata = data; + unsigned char *sdata; int servname_type; - int dsize = size-3 ; - - if (dsize > 0 ) + int dsize; + + if (size < 2) { - servname_type = *(sdata++); + *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); - if (len != dsize) + 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->session->tlsext_hostname == NULL) + if (s->session->tlsext_hostname == NULL) { if (len > TLSEXT_MAXLEN_host_name || ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)) @@ -324,14 +726,12 @@ int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, in 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; -#if 0 - fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_hostname %s\n",s->session->tlsext_hostname); -#endif } else s->servername_done = strlen(s->session->tlsext_hostname) == len @@ -342,12 +742,20 @@ int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, in default: break; } - + + dsize -= len; } + if (dsize != 0) + { + *al = SSL_AD_DECODE_ERROR; + return 0; + } + } #ifndef OPENSSL_NO_EC - else if (type == TLSEXT_TYPE_ec_point_formats) + else if (type == TLSEXT_TYPE_ec_point_formats && + s->version != DTLS1_VERSION) { unsigned char *sdata = data; int ecpointformatlist_length = *(sdata++); @@ -374,13 +782,204 @@ int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, in fprintf(stderr,"\n"); #endif } - data+=size; - } + else if (type == TLSEXT_TYPE_elliptic_curves && + s->version != DTLS1_VERSION) + { + unsigned char *sdata = data; + int ellipticcurvelist_length = (*(sdata++) << 8); + ellipticcurvelist_length += (*(sdata++)); + + 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) + { + *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 && + s->version != DTLS1_VERSION) + { + 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_status_request && + s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb) + { + + 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; + 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 */ + n2s(data,dsize); + size -= 2; + if (dsize > size) + { + *al = SSL_AD_DECODE_ERROR; + return 0; + } + sdata = data; + if (dsize > 0) + { + 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; + } + + /* session ticket processed earlier */ + data+=size; + } + *p = data; + + ri_check: + + /* Need RI if renegotiating */ + + if (!renegotiate_seen && s->new_session && + !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) + { + *al = SSL_AD_HANDSHAKE_FAILURE; + SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT, + SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); + return 0; + } + return 1; -} + } int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) { @@ -388,14 +987,11 @@ int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, in unsigned short size; unsigned short len; unsigned char *data = *p; - int tlsext_servername = 0; -#ifndef OPENSSL_NO_EC - int tlsext_ecpointformats = 0; -#endif /* OPENSSL_NO_EC */ + int renegotiate_seen = 0; if (data >= (d+n-2)) - return 1; + goto ri_check; n2s(data,len); @@ -405,7 +1001,11 @@ int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, in n2s(data,size); if (data+size > (d+n)) - return 1; + 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) { @@ -418,7 +1018,8 @@ int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, in } #ifndef OPENSSL_NO_EC - else if (type == TLSEXT_TYPE_ec_point_formats) + else if (type == TLSEXT_TYPE_ec_point_formats && + s->version != DTLS1_VERSION) { unsigned char *sdata = data; int ecpointformatlist_length = *(sdata++); @@ -445,10 +1046,78 @@ int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, in 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 && + s->version != DTLS1_VERSION) + { + 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 && + s->version != DTLS1_VERSION) + { + /* 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; + } + else if (type == TLSEXT_TYPE_renegotiate) + { + if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al)) + return 0; + renegotiate_seen = 1; + } data+=size; } -#endif /* OPENSSL_NO_EC */ if (data != d+n) { @@ -477,54 +1146,54 @@ int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, in } } -#ifndef OPENSSL_NO_EC - if (!s->hit && tlsext_ecpointformats == 1) + *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)) { - if (s->tlsext_ecpointformatlist) - { - if (s->session->tlsext_ecpointformatlist == NULL) - { - s->session->tlsext_ecpointformatlist_length = s->tlsext_ecpointformatlist_length; - if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist); - if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(s->tlsext_ecpointformatlist_length)) == NULL) - { - *al = TLS1_AD_INTERNAL_ERROR; - return 0; - } - memcpy(s->session->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length); - } - else - { - *al = SSL_AD_DECODE_ERROR; - return 0; - } - } + *al = SSL_AD_HANDSHAKE_FAILURE; + SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT, + SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); + return 0; } -#endif /* OPENSSL_NO_EC */ - *p = data; return 1; -} + } + int ssl_prepare_clienthello_tlsext(SSL *s) { #ifndef OPENSSL_NO_EC - /* If we are client and using an elliptic curve cryptography cipher suite, send the point formats we - * support. + /* 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; - int algs; + unsigned char *j; + 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++) { - algs = (sk_SSL_CIPHER_value(cipher_stack, i))->algorithms; - if ((algs & SSL_kECDH) || (algs & SSL_kECDHE) || (algs & SSL_aECDSA)) + SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i); + + alg_k = c->algorithm_mkey; + alg_a = c->algorithm_auth; + if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe) || (alg_a & SSL_aECDSA))) { using_ecc = 1; break; } - } using_ecc = using_ecc && (s->version == TLS1_VERSION); if (using_ecc) @@ -532,34 +1201,85 @@ int ssl_prepare_clienthello_tlsext(SSL *s) if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist); if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL) { - SSLerr(SSL_F_TLS1_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); + SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); return -1; } 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; (unsigned int)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) + { + 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) { #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. + * if the client sent us an ECPointsFormat extension. Note that the server is not + * supposed to send an EllipticCurves extension. */ - int algs = s->s3->tmp.new_cipher->algorithms; - int using_ecc = (algs & SSL_kECDH) || (algs & SSL_kECDHE) || (algs & SSL_aECDSA); - using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL); + 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) { if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist); if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL) { - SSLerr(SSL_F_TLS1_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); + SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); return -1; } s->tlsext_ecpointformatlist_length = 3; @@ -568,8 +1288,9 @@ int ssl_prepare_serverhello_tlsext(SSL *s) s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2; } #endif /* OPENSSL_NO_EC */ + return 1; -} + } int ssl_check_clienthello_tlsext(SSL *s) { @@ -577,10 +1298,11 @@ int ssl_check_clienthello_tlsext(SSL *s) int al = SSL_AD_UNRECOGNIZED_NAME; #ifndef OPENSSL_NO_EC - /* If we are server and using an elliptic curve cyrptography cipher suite, then we don't - * need to check EC point formats since all clients must support uncompressed and it's the - * only thing we support; we just need to copy the data in. We probably ought to check it - * for validity, but we never use it. + /* 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 @@ -589,7 +1311,97 @@ int ssl_check_clienthello_tlsext(SSL *s) 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); - switch (ret) { + /* 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 && s->ctx->tlsext_status_cb) + { + 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; + } + } + else + s->tlsext_status_expected = 0; + +#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(). */ + + 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) + { + 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; + } + } + +#endif + err: + switch (ret) + { case SSL_TLSEXT_ERR_ALERT_FATAL: ssl3_send_alert(s,SSL3_AL_FATAL,al); return -1; @@ -602,8 +1414,8 @@ int ssl_check_clienthello_tlsext(SSL *s) s->servername_done=0; default: return 1; + } } -} int ssl_check_serverhello_tlsext(SSL *s) { @@ -614,17 +1426,18 @@ int ssl_check_serverhello_tlsext(SSL *s) /* If we are client and using an elliptic curve cryptography cipher suite, then server * must return a an EC point formats lists containing uncompressed. */ - int algs = s->s3->tmp.new_cipher->algorithms; + 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) && - ((algs & SSL_kECDH) || (algs & SSL_kECDHE) || (algs & SSL_aECDSA))) + ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA))) { /* we are using an ECC cipher */ - int i; + size_t i; unsigned char *list; int found_uncompressed = 0; - if ((s->session->tlsext_ecpointformatlist == NULL) || (s->session->tlsext_ecpointformatlist_length <= 0)) + if ((s->session->tlsext_ecpointformatlist == NULL) || (s->session->tlsext_ecpointformatlist_length == 0)) { - SSLerr(SSL_F_TLS1_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); + SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); return -1; } list = s->session->tlsext_ecpointformatlist; @@ -638,7 +1451,7 @@ int ssl_check_serverhello_tlsext(SSL *s) } if (!found_uncompressed) { - SSLerr(SSL_F_TLS1_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); + SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); return -1; } } @@ -650,7 +1463,60 @@ int ssl_check_serverhello_tlsext(SSL *s) 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); - switch (ret) { +#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; @@ -663,6 +1529,187 @@ int ssl_check_serverhello_tlsext(SSL *s) s->servername_done=0; default: return 1; + } } -} + +/* 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. + */ + +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 tickets disabled behave as if no ticket present + * to permit stateful resumption. + */ + if (SSL_get_options(s) & SSL_OP_NO_TICKET) + return 1; + + if ((s->version <= SSL3_VERSION) || !limit) + return 1; + if (p >= limit) + return -1; + /* Skip past DTLS cookie */ + if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER) + { + 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 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 tickets disabled indicate cache miss which will + * trigger a full handshake + */ + if (SSL_get_options(s) & SSL_OP_NO_TICKET) + return 1; + /* If zero length note client will accept a ticket + * and indicate cache miss to trigger full handshake + */ + if (size == 0) + { + s->tlsext_ticket_expected = 1; + return 0; /* Cache miss */ + } + if (s->tls_session_secret_cb) + { + /* Indicate cache miss here and instead of + * generating the session from ticket now, + * trigger abbreviated handshake based on + * external mechanism to calculate the master + * secret later. */ + return 0; + } + return tls_decrypt_ticket(s, p, size, session_id, len, + ret); + } + p += size; + } + return 1; + } + +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, 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) + goto tickerr; + /* 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) + goto tickerr; + if (rv == 2) + renew_ticket = 1; + } + else + { + /* Check key name matches */ + if (memcmp(etick, tctx->tlsext_tick_key_name, 16)) + goto tickerr; + 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 (memcmp(tick_hmac, etick + eticklen, mlen)) + goto tickerr; + /* 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) + goto tickerr; + slen += mlen; + EVP_CIPHER_CTX_cleanup(&ctx); + p = sdec; + + 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; + s->tlsext_ticket_expected = renew_ticket; + return 1; + } + /* If session decrypt failure indicate a cache miss and set state to + * send a new ticket + */ + tickerr: + s->tlsext_ticket_expected = 1; + return 0; + } + #endif