/* ssl/t1_lib.c */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ /* ==================================================================== * 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 * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * openssl-core@openssl.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.openssl.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com). This product includes software written by Tim * Hudson (tjh@cryptsoft.com). * */ #include #include #include #include #include #include "ssl_locl.h" 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, 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, }; long tls1_default_timeout(void) { /* 2 hours, the 24 hours mentioned in the TLSv1 spec * is way too long for http, the cache would over fill */ return(60*60*2); } int tls1_new(SSL *s) { if (!ssl3_new(s)) return(0); s->method->ssl_clear(s); return(1); } 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 = 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) { 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->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->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 && s->version != DTLS1_VERSION) { /* 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; } 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 ((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 && s->version != DTLS1_VERSION) { /* 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) { 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) { unsigned short type; unsigned short size; unsigned short len; unsigned char *data = *p; int renegotiate_seen = 0; s->servername_done = 0; s->tlsext_status_type = -1; 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->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); s->session->tlsext_hostname = NULL; *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; } dsize -= len; } if (dsize != 0) { *al = SSL_AD_DECODE_ERROR; return 0; } } #ifndef OPENSSL_NO_EC else if (type == TLSEXT_TYPE_ec_point_formats && s->version != DTLS1_VERSION) { 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"); #endif } 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) { unsigned short type; unsigned short size; unsigned short len; unsigned char *data = *p; int tlsext_servername = 0; int renegotiate_seen = 0; if (data >= (d+n-2)) goto ri_check; n2s(data,len); 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 && s->version != DTLS1_VERSION) { 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 && 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; } 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_PARSE_SERVERHELLO_TLSEXT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); return 0; } 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 * 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); for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++) { 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) { if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist); if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL) { 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. Note that the server is not * supposed to send an EllipticCurves extension. */ 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_SSL_PREPARE_SERVERHELLO_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; } #endif /* OPENSSL_NO_EC */ return 1; } int ssl_check_clienthello_tlsext(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); /* 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; 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_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 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))) { /* 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)) { SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); return -1; } 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; } } /* 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