/* ssl/s3_clnt.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). * */ /* ==================================================================== * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. * * Portions of the attached software ("Contribution") are developed by * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. * * The Contribution is licensed pursuant to the OpenSSL open source * license provided above. * * ECC cipher suite support in OpenSSL originally written by * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories. * */ /* ==================================================================== * Copyright 2005 Nokia. All rights reserved. * * The portions of the attached software ("Contribution") is developed by * Nokia Corporation and is licensed pursuant to the OpenSSL open source * license. * * The Contribution, originally written by Mika Kousa and Pasi Eronen of * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites * support (see RFC 4279) to OpenSSL. * * No patent licenses or other rights except those expressly stated in * the OpenSSL open source license shall be deemed granted or received * expressly, by implication, estoppel, or otherwise. * * No assurances are provided by Nokia that the Contribution does not * infringe the patent or other intellectual property rights of any third * party or that the license provides you with all the necessary rights * to make use of the Contribution. * * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR * OTHERWISE. */ #include #include "ssl_locl.h" #include #include #include #include #include #ifndef OPENSSL_NO_DH # include #endif #include #ifndef OPENSSL_NO_ENGINE # include #endif static int ssl_set_version(SSL *s); static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b); static int ssl3_check_finished(SSL *s); static int ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) *sk, unsigned char *p, int (*put_cb) (const SSL_CIPHER *, unsigned char *)); int ssl3_connect(SSL *s) { BUF_MEM *buf = NULL; unsigned long Time = (unsigned long)time(NULL); void (*cb) (const SSL *ssl, int type, int val) = NULL; int ret = -1; int new_state, state, skip = 0; RAND_add(&Time, sizeof(Time), 0); ERR_clear_error(); clear_sys_error(); if (s->info_callback != NULL) cb = s->info_callback; else if (s->ctx->info_callback != NULL) cb = s->ctx->info_callback; s->in_handshake++; if (!SSL_in_init(s) || SSL_in_before(s)) { if (!SSL_clear(s)) return -1; } #ifndef OPENSSL_NO_HEARTBEATS /* * If we're awaiting a HeartbeatResponse, pretend we already got and * don't await it anymore, because Heartbeats don't make sense during * handshakes anyway. */ if (s->tlsext_hb_pending) { s->tlsext_hb_pending = 0; s->tlsext_hb_seq++; } #endif for (;;) { state = s->state; switch (s->state) { case SSL_ST_RENEGOTIATE: s->renegotiate = 1; s->state = SSL_ST_CONNECT; s->ctx->stats.sess_connect_renegotiate++; /* break */ case SSL_ST_BEFORE: case SSL_ST_CONNECT: case SSL_ST_BEFORE | SSL_ST_CONNECT: case SSL_ST_OK | SSL_ST_CONNECT: s->server = 0; if (cb != NULL) cb(s, SSL_CB_HANDSHAKE_START, 1); if ((s->version >> 8) != SSL3_VERSION_MAJOR && s->version != TLS_ANY_VERSION) { SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR); s->state = SSL_ST_ERR; ret = -1; goto end; } if (s->version != TLS_ANY_VERSION && !ssl_security(s, SSL_SECOP_VERSION, 0, s->version, NULL)) { SSLerr(SSL_F_SSL3_CONNECT, SSL_R_VERSION_TOO_LOW); return -1; } /* s->version=SSL3_VERSION; */ s->type = SSL_ST_CONNECT; if (s->init_buf == NULL) { if ((buf = BUF_MEM_new()) == NULL) { ret = -1; s->state = SSL_ST_ERR; goto end; } if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) { ret = -1; s->state = SSL_ST_ERR; goto end; } s->init_buf = buf; buf = NULL; } if (!ssl3_setup_buffers(s)) { ret = -1; goto end; } /* setup buffing BIO */ if (!ssl_init_wbio_buffer(s, 0)) { ret = -1; s->state = SSL_ST_ERR; goto end; } /* don't push the buffering BIO quite yet */ ssl3_init_finished_mac(s); s->state = SSL3_ST_CW_CLNT_HELLO_A; s->ctx->stats.sess_connect++; s->init_num = 0; s->s3->flags &= ~SSL3_FLAGS_CCS_OK; /* * Should have been reset by ssl3_get_finished, too. */ s->s3->change_cipher_spec = 0; break; case SSL3_ST_CW_CLNT_HELLO_A: case SSL3_ST_CW_CLNT_HELLO_B: s->shutdown = 0; ret = ssl3_client_hello(s); if (ret <= 0) goto end; s->state = SSL3_ST_CR_SRVR_HELLO_A; s->init_num = 0; /* turn on buffering for the next lot of output */ if (s->bbio != s->wbio) s->wbio = BIO_push(s->bbio, s->wbio); break; case SSL3_ST_CR_SRVR_HELLO_A: case SSL3_ST_CR_SRVR_HELLO_B: ret = ssl3_get_server_hello(s); if (ret <= 0) goto end; if (s->hit) { s->state = SSL3_ST_CR_FINISHED_A; if (s->tlsext_ticket_expected) { /* receive renewed session ticket */ s->state = SSL3_ST_CR_SESSION_TICKET_A; } } else { s->state = SSL3_ST_CR_CERT_A; } s->init_num = 0; break; case SSL3_ST_CR_CERT_A: case SSL3_ST_CR_CERT_B: /* Noop (ret = 0) for everything but EAP-FAST. */ ret = ssl3_check_finished(s); if (ret < 0) goto end; if (ret == 1) { s->hit = 1; s->state = SSL3_ST_CR_FINISHED_A; s->init_num = 0; break; } /* Check if it is anon DH/ECDH, SRP auth */ /* or PSK */ if (! (s->s3->tmp. new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP)) && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { ret = ssl3_get_server_certificate(s); if (ret <= 0) goto end; if (s->tlsext_status_expected) s->state = SSL3_ST_CR_CERT_STATUS_A; else s->state = SSL3_ST_CR_KEY_EXCH_A; } else { skip = 1; s->state = SSL3_ST_CR_KEY_EXCH_A; } s->init_num = 0; break; case SSL3_ST_CR_KEY_EXCH_A: case SSL3_ST_CR_KEY_EXCH_B: ret = ssl3_get_key_exchange(s); if (ret <= 0) goto end; s->state = SSL3_ST_CR_CERT_REQ_A; s->init_num = 0; /* * at this point we check that we have the required stuff from * the server */ if (!ssl3_check_cert_and_algorithm(s)) { ret = -1; s->state = SSL_ST_ERR; goto end; } break; case SSL3_ST_CR_CERT_REQ_A: case SSL3_ST_CR_CERT_REQ_B: ret = ssl3_get_certificate_request(s); if (ret <= 0) goto end; s->state = SSL3_ST_CR_SRVR_DONE_A; s->init_num = 0; break; case SSL3_ST_CR_SRVR_DONE_A: case SSL3_ST_CR_SRVR_DONE_B: ret = ssl3_get_server_done(s); if (ret <= 0) goto end; #ifndef OPENSSL_NO_SRP if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) { if ((ret = SRP_Calc_A_param(s)) <= 0) { SSLerr(SSL_F_SSL3_CONNECT, SSL_R_SRP_A_CALC); ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); s->state = SSL_ST_ERR; goto end; } } #endif if (s->s3->tmp.cert_req) s->state = SSL3_ST_CW_CERT_A; else s->state = SSL3_ST_CW_KEY_EXCH_A; s->init_num = 0; break; case SSL3_ST_CW_CERT_A: case SSL3_ST_CW_CERT_B: case SSL3_ST_CW_CERT_C: case SSL3_ST_CW_CERT_D: ret = ssl3_send_client_certificate(s); if (ret <= 0) goto end; s->state = SSL3_ST_CW_KEY_EXCH_A; s->init_num = 0; break; case SSL3_ST_CW_KEY_EXCH_A: case SSL3_ST_CW_KEY_EXCH_B: ret = ssl3_send_client_key_exchange(s); if (ret <= 0) goto end; /* * EAY EAY EAY need to check for DH fix cert sent back */ /* * For TLS, cert_req is set to 2, so a cert chain of nothing is * sent, but no verify packet is sent */ /* * XXX: For now, we do not support client authentication in ECDH * cipher suites with ECDH (rather than ECDSA) certificates. We * need to skip the certificate verify message when client's * ECDH public key is sent inside the client certificate. */ if (s->s3->tmp.cert_req == 1) { s->state = SSL3_ST_CW_CERT_VRFY_A; } else { s->state = SSL3_ST_CW_CHANGE_A; } if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) { s->state = SSL3_ST_CW_CHANGE_A; } s->init_num = 0; break; case SSL3_ST_CW_CERT_VRFY_A: case SSL3_ST_CW_CERT_VRFY_B: ret = ssl3_send_client_verify(s); if (ret <= 0) goto end; s->state = SSL3_ST_CW_CHANGE_A; s->init_num = 0; break; case SSL3_ST_CW_CHANGE_A: case SSL3_ST_CW_CHANGE_B: ret = ssl3_send_change_cipher_spec(s, SSL3_ST_CW_CHANGE_A, SSL3_ST_CW_CHANGE_B); if (ret <= 0) goto end; #if defined(OPENSSL_NO_NEXTPROTONEG) s->state = SSL3_ST_CW_FINISHED_A; #else if (s->s3->next_proto_neg_seen) s->state = SSL3_ST_CW_NEXT_PROTO_A; else s->state = SSL3_ST_CW_FINISHED_A; #endif s->init_num = 0; s->session->cipher = s->s3->tmp.new_cipher; #ifdef OPENSSL_NO_COMP s->session->compress_meth = 0; #else if (s->s3->tmp.new_compression == NULL) s->session->compress_meth = 0; else s->session->compress_meth = s->s3->tmp.new_compression->id; #endif if (!s->method->ssl3_enc->setup_key_block(s)) { ret = -1; s->state = SSL_ST_ERR; goto end; } if (!s->method->ssl3_enc->change_cipher_state(s, SSL3_CHANGE_CIPHER_CLIENT_WRITE)) { ret = -1; s->state = SSL_ST_ERR; goto end; } break; #if !defined(OPENSSL_NO_NEXTPROTONEG) case SSL3_ST_CW_NEXT_PROTO_A: case SSL3_ST_CW_NEXT_PROTO_B: ret = ssl3_send_next_proto(s); if (ret <= 0) goto end; s->state = SSL3_ST_CW_FINISHED_A; break; #endif case SSL3_ST_CW_FINISHED_A: case SSL3_ST_CW_FINISHED_B: ret = ssl3_send_finished(s, SSL3_ST_CW_FINISHED_A, SSL3_ST_CW_FINISHED_B, s->method-> ssl3_enc->client_finished_label, s->method-> ssl3_enc->client_finished_label_len); if (ret <= 0) goto end; s->state = SSL3_ST_CW_FLUSH; /* clear flags */ s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER; if (s->hit) { s->s3->tmp.next_state = SSL_ST_OK; if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) { s->state = SSL_ST_OK; s->s3->flags |= SSL3_FLAGS_POP_BUFFER; s->s3->delay_buf_pop_ret = 0; } } else { /* * Allow NewSessionTicket if ticket expected */ if (s->tlsext_ticket_expected) s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A; else s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A; } s->init_num = 0; break; case SSL3_ST_CR_SESSION_TICKET_A: case SSL3_ST_CR_SESSION_TICKET_B: ret = ssl3_get_new_session_ticket(s); if (ret <= 0) goto end; s->state = SSL3_ST_CR_FINISHED_A; s->init_num = 0; break; case SSL3_ST_CR_CERT_STATUS_A: case SSL3_ST_CR_CERT_STATUS_B: ret = ssl3_get_cert_status(s); if (ret <= 0) goto end; s->state = SSL3_ST_CR_KEY_EXCH_A; s->init_num = 0; break; case SSL3_ST_CR_FINISHED_A: case SSL3_ST_CR_FINISHED_B: if (!s->s3->change_cipher_spec) s->s3->flags |= SSL3_FLAGS_CCS_OK; ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A, SSL3_ST_CR_FINISHED_B); if (ret <= 0) goto end; if (s->hit) s->state = SSL3_ST_CW_CHANGE_A; else s->state = SSL_ST_OK; s->init_num = 0; break; case SSL3_ST_CW_FLUSH: s->rwstate = SSL_WRITING; if (BIO_flush(s->wbio) <= 0) { ret = -1; goto end; } s->rwstate = SSL_NOTHING; s->state = s->s3->tmp.next_state; break; case SSL_ST_OK: /* clean a few things up */ ssl3_cleanup_key_block(s); BUF_MEM_free(s->init_buf); s->init_buf = NULL; /* * If we are not 'joining' the last two packets, remove the * buffering now */ if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) ssl_free_wbio_buffer(s); /* else do it later in ssl3_write */ s->init_num = 0; s->renegotiate = 0; s->new_session = 0; ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); if (s->hit) s->ctx->stats.sess_hit++; ret = 1; /* s->server=0; */ s->handshake_func = ssl3_connect; s->ctx->stats.sess_connect_good++; if (cb != NULL) cb(s, SSL_CB_HANDSHAKE_DONE, 1); goto end; /* break; */ case SSL_ST_ERR: default: SSLerr(SSL_F_SSL3_CONNECT, SSL_R_UNKNOWN_STATE); ret = -1; goto end; /* break; */ } /* did we do anything */ if (!s->s3->tmp.reuse_message && !skip) { if (s->debug) { if ((ret = BIO_flush(s->wbio)) <= 0) goto end; } if ((cb != NULL) && (s->state != state)) { new_state = s->state; s->state = state; cb(s, SSL_CB_CONNECT_LOOP, 1); s->state = new_state; } } skip = 0; } end: s->in_handshake--; BUF_MEM_free(buf); if (cb != NULL) cb(s, SSL_CB_CONNECT_EXIT, ret); return (ret); } /* * Work out what version we should be using for the initial ClientHello if * the version is currently set to (D)TLS_ANY_VERSION. * Returns 1 on success * Returns 0 on error */ static int ssl_set_version(SSL *s) { unsigned long mask, options = s->options; if (s->method->version == TLS_ANY_VERSION) { /* * SSL_OP_NO_X disables all protocols above X *if* there are * some protocols below X enabled. This is required in order * to maintain "version capability" vector contiguous. So * that if application wants to disable TLS1.0 in favour of * TLS1>=1, it would be insufficient to pass SSL_NO_TLSv1, the * answer is SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3. */ mask = SSL_OP_NO_TLSv1_1 | SSL_OP_NO_TLSv1 #if !defined(OPENSSL_NO_SSL3) | SSL_OP_NO_SSLv3 #endif ; #if !defined(OPENSSL_NO_TLS1_2_CLIENT) if (options & SSL_OP_NO_TLSv1_2) { if ((options & mask) != mask) { s->version = TLS1_1_VERSION; } else { SSLerr(SSL_F_SSL_SET_VERSION, SSL_R_NO_PROTOCOLS_AVAILABLE); return 0; } } else { s->version = TLS1_2_VERSION; } #else if ((options & mask) == mask) { SSLerr(SSL_F_SSL_SET_VERSION, SSL_R_NO_PROTOCOLS_AVAILABLE); return 0; } s->version = TLS1_1_VERSION; #endif mask &= ~SSL_OP_NO_TLSv1_1; if ((options & SSL_OP_NO_TLSv1_1) && (options & mask) != mask) s->version = TLS1_VERSION; mask &= ~SSL_OP_NO_TLSv1; #if !defined(OPENSSL_NO_SSL3) if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask) s->version = SSL3_VERSION; #endif if (s->version != TLS1_2_VERSION && tls1_suiteb(s)) { SSLerr(SSL_F_SSL_SET_VERSION, SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE); return 0; } if (s->version == SSL3_VERSION && FIPS_mode()) { SSLerr(SSL_F_SSL_SET_VERSION, SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); return 0; } } else if (s->method->version == DTLS_ANY_VERSION) { /* Determine which DTLS version to use */ /* If DTLS 1.2 disabled correct the version number */ if (options & SSL_OP_NO_DTLSv1_2) { if (tls1_suiteb(s)) { SSLerr(SSL_F_SSL_SET_VERSION, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE); return 0; } /* * Disabling all versions is silly: return an error. */ if (options & SSL_OP_NO_DTLSv1) { SSLerr(SSL_F_SSL_SET_VERSION, SSL_R_WRONG_SSL_VERSION); return 0; } /* * Update method so we don't use any DTLS 1.2 features. */ s->method = DTLSv1_client_method(); s->version = DTLS1_VERSION; } else { /* * We only support one version: update method */ if (options & SSL_OP_NO_DTLSv1) s->method = DTLSv1_2_client_method(); s->version = DTLS1_2_VERSION; } } s->client_version = s->version; return 1; } int ssl3_client_hello(SSL *s) { unsigned char *buf; unsigned char *p, *d; int i; unsigned long l; int al = 0; #ifndef OPENSSL_NO_COMP int j; SSL_COMP *comp; #endif buf = (unsigned char *)s->init_buf->data; if (s->state == SSL3_ST_CW_CLNT_HELLO_A) { SSL_SESSION *sess = s->session; /* Work out what SSL/TLS/DTLS version to use */ if (ssl_set_version(s) == 0) goto err; if ((sess == NULL) || (sess->ssl_version != s->version) || /* * In the case of EAP-FAST, we can have a pre-shared * "ticket" without a session ID. */ (!sess->session_id_length && !sess->tlsext_tick) || (sess->not_resumable)) { if (!ssl_get_new_session(s, 0)) goto err; } /* else use the pre-loaded session */ p = s->s3->client_random; /* * for DTLS if client_random is initialized, reuse it, we are * required to use same upon reply to HelloVerify */ if (SSL_IS_DTLS(s)) { size_t idx; i = 1; for (idx = 0; idx < sizeof(s->s3->client_random); idx++) { if (p[idx]) { i = 0; break; } } } else i = 1; if (i && ssl_fill_hello_random(s, 0, p, sizeof(s->s3->client_random)) <= 0) goto err; /* Do the message type and length last */ d = p = ssl_handshake_start(s); /*- * version indicates the negotiated version: for example from * an SSLv2/v3 compatible client hello). The client_version * field is the maximum version we permit and it is also * used in RSA encrypted premaster secrets. Some servers can * choke if we initially report a higher version then * renegotiate to a lower one in the premaster secret. This * didn't happen with TLS 1.0 as most servers supported it * but it can with TLS 1.1 or later if the server only supports * 1.0. * * Possible scenario with previous logic: * 1. Client hello indicates TLS 1.2 * 2. Server hello says TLS 1.0 * 3. RSA encrypted premaster secret uses 1.2. * 4. Handhaked proceeds using TLS 1.0. * 5. Server sends hello request to renegotiate. * 6. Client hello indicates TLS v1.0 as we now * know that is maximum server supports. * 7. Server chokes on RSA encrypted premaster secret * containing version 1.0. * * For interoperability it should be OK to always use the * maximum version we support in client hello and then rely * on the checking of version to ensure the servers isn't * being inconsistent: for example initially negotiating with * TLS 1.0 and renegotiating with TLS 1.2. We do this by using * client_version in client hello and not resetting it to * the negotiated version. */ *(p++) = s->client_version >> 8; *(p++) = s->client_version & 0xff; /* Random stuff */ memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); p += SSL3_RANDOM_SIZE; /* Session ID */ if (s->new_session) i = 0; else i = s->session->session_id_length; *(p++) = i; if (i != 0) { if (i > (int)sizeof(s->session->session_id)) { SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); goto err; } memcpy(p, s->session->session_id, i); p += i; } /* cookie stuff for DTLS */ if (SSL_IS_DTLS(s)) { if (s->d1->cookie_len > sizeof(s->d1->cookie)) { SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); goto err; } *(p++) = s->d1->cookie_len; memcpy(p, s->d1->cookie, s->d1->cookie_len); p += s->d1->cookie_len; } /* Ciphers supported */ i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0); if (i == 0) { SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE); goto err; } #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH /* * Some servers hang if client hello > 256 bytes as hack workaround * chop number of supported ciphers to keep it well below this if we * use TLS v1.2 */ if (TLS1_get_version(s) >= TLS1_2_VERSION && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH) i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1; #endif s2n(i, p); p += i; /* COMPRESSION */ #ifdef OPENSSL_NO_COMP *(p++) = 1; #else if (!ssl_allow_compression(s) || !s->ctx->comp_methods) j = 0; else j = sk_SSL_COMP_num(s->ctx->comp_methods); *(p++) = 1 + j; for (i = 0; i < j; i++) { comp = sk_SSL_COMP_value(s->ctx->comp_methods, i); *(p++) = comp->id; } #endif *(p++) = 0; /* Add the NULL method */ /* TLS extensions */ if (ssl_prepare_clienthello_tlsext(s) <= 0) { SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); goto err; } if ((p = ssl_add_clienthello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL) { ssl3_send_alert(s, SSL3_AL_FATAL, al); SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); goto err; } l = p - d; if (!ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l)) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); goto err; } s->state = SSL3_ST_CW_CLNT_HELLO_B; } /* SSL3_ST_CW_CLNT_HELLO_B */ return ssl_do_write(s); err: s->state = SSL_ST_ERR; return (-1); } int ssl3_get_server_hello(SSL *s) { STACK_OF(SSL_CIPHER) *sk; const SSL_CIPHER *c; unsigned char *p, *d; int i, al = SSL_AD_INTERNAL_ERROR, ok; unsigned int j; long n; #ifndef OPENSSL_NO_COMP SSL_COMP *comp; #endif /* * Hello verify request and/or server hello version may not match so set * first packet if we're negotiating version. */ s->first_packet = 1; n = s->method->ssl_get_message(s, SSL3_ST_CR_SRVR_HELLO_A, SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, &ok); if (!ok) return ((int)n); s->first_packet = 0; if (SSL_IS_DTLS(s)) { if (s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) { if (s->d1->send_cookie == 0) { s->s3->tmp.reuse_message = 1; return 1; } else { /* already sent a cookie */ al = SSL_AD_UNEXPECTED_MESSAGE; SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE); goto f_err; } } } if (s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO) { al = SSL_AD_UNEXPECTED_MESSAGE; SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE); goto f_err; } d = p = (unsigned char *)s->init_msg; if (s->method->version == TLS_ANY_VERSION) { int sversion = (p[0] << 8) | p[1]; #if TLS_MAX_VERSION != TLS1_2_VERSION #error Code needs updating for new TLS version #endif #ifndef OPENSSL_NO_SSL3 if ((sversion == SSL3_VERSION) && !(s->options & SSL_OP_NO_SSLv3)) { if (FIPS_mode()) { SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); al = SSL_AD_PROTOCOL_VERSION; goto f_err; } s->method = SSLv3_client_method(); } else #endif if ((sversion == TLS1_VERSION) && !(s->options & SSL_OP_NO_TLSv1)) { s->method = TLSv1_client_method(); } else if ((sversion == TLS1_1_VERSION) && !(s->options & SSL_OP_NO_TLSv1_1)) { s->method = TLSv1_1_client_method(); } else if ((sversion == TLS1_2_VERSION) && !(s->options & SSL_OP_NO_TLSv1_2)) { s->method = TLSv1_2_client_method(); } else { SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL); al = SSL_AD_PROTOCOL_VERSION; goto f_err; } s->session->ssl_version = s->version = s->method->version; if (!ssl_security(s, SSL_SECOP_VERSION, 0, s->version, NULL)) { SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_VERSION_TOO_LOW); al = SSL_AD_PROTOCOL_VERSION; goto f_err; } } else if (s->method->version == DTLS_ANY_VERSION) { /* Work out correct protocol version to use */ int hversion = (p[0] << 8) | p[1]; int options = s->options; if (hversion == DTLS1_2_VERSION && !(options & SSL_OP_NO_DTLSv1_2)) s->method = DTLSv1_2_client_method(); else if (tls1_suiteb(s)) { SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE); s->version = hversion; al = SSL_AD_PROTOCOL_VERSION; goto f_err; } else if (hversion == DTLS1_VERSION && !(options & SSL_OP_NO_DTLSv1)) s->method = DTLSv1_client_method(); else { SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION); s->version = hversion; al = SSL_AD_PROTOCOL_VERSION; goto f_err; } s->version = s->method->version; } else if ((p[0] != (s->version >> 8)) || (p[1] != (s->version & 0xff))) { SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION); s->version = (s->version & 0xff00) | p[1]; al = SSL_AD_PROTOCOL_VERSION; goto f_err; } p += 2; /* load the server hello data */ /* load the server random */ memcpy(s->s3->server_random, p, SSL3_RANDOM_SIZE); p += SSL3_RANDOM_SIZE; s->hit = 0; /* get the session-id */ j = *(p++); if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE)) { al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_SSL3_SESSION_ID_TOO_LONG); goto f_err; } /* * Check if we can resume the session based on external pre-shared secret. * EAP-FAST (RFC 4851) supports two types of session resumption. * Resumption based on server-side state works with session IDs. * Resumption based on pre-shared Protected Access Credentials (PACs) * works by overriding the SessionTicket extension at the application * layer, and does not send a session ID. (We do not know whether EAP-FAST * servers would honour the session ID.) Therefore, the session ID alone * is not a reliable indicator of session resumption, so we first check if * we can resume, and later peek at the next handshake message to see if the * server wants to resume. */ if (s->version >= TLS1_VERSION && s->tls_session_secret_cb && s->session->tlsext_tick) { SSL_CIPHER *pref_cipher = NULL; s->session->master_key_length = sizeof(s->session->master_key); if (s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length, NULL, &pref_cipher, s->tls_session_secret_cb_arg)) { s->session->cipher = pref_cipher ? pref_cipher : ssl_get_cipher_by_char(s, p + j); } else { SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR); al = SSL_AD_INTERNAL_ERROR; goto f_err; } } if (j != 0 && j == s->session->session_id_length && memcmp(p, s->session->session_id, j) == 0) { if (s->sid_ctx_length != s->session->sid_ctx_length || memcmp(s->session->sid_ctx, s->sid_ctx, s->sid_ctx_length)) { /* actually a client application bug */ al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); goto f_err; } s->hit = 1; } else { /* * If we were trying for session-id reuse but the server * didn't echo the ID, make a new SSL_SESSION. * In the case of EAP-FAST and PAC, we do not send a session ID, * so the PAC-based session secret is always preserved. It'll be * overwritten if the server refuses resumption. */ if (s->session->session_id_length > 0) { if (!ssl_get_new_session(s, 0)) { goto f_err; } } s->session->session_id_length = j; memcpy(s->session->session_id, p, j); /* j could be 0 */ } p += j; c = ssl_get_cipher_by_char(s, p); if (c == NULL) { /* unknown cipher */ al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_UNKNOWN_CIPHER_RETURNED); goto f_err; } /* Set version disabled mask now we know version */ if (!SSL_USE_TLS1_2_CIPHERS(s)) s->s3->tmp.mask_ssl = SSL_TLSV1_2; else s->s3->tmp.mask_ssl = 0; /* * If it is a disabled cipher we didn't send it in client hello, so * return an error. */ if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_CHECK)) { al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED); goto f_err; } p += ssl_put_cipher_by_char(s, NULL, NULL); sk = ssl_get_ciphers_by_id(s); i = sk_SSL_CIPHER_find(sk, c); if (i < 0) { /* we did not say we would use this cipher */ al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED); goto f_err; } /* * Depending on the session caching (internal/external), the cipher * and/or cipher_id values may not be set. Make sure that cipher_id is * set and use it for comparison. */ if (s->session->cipher) s->session->cipher_id = s->session->cipher->id; if (s->hit && (s->session->cipher_id != c->id)) { al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); goto f_err; } s->s3->tmp.new_cipher = c; /* * Don't digest cached records if no sigalgs: we may need them for client * authentication. */ if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s)) goto f_err; /* lets get the compression algorithm */ /* COMPRESSION */ #ifdef OPENSSL_NO_COMP if (*(p++) != 0) { al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); goto f_err; } /* * If compression is disabled we'd better not try to resume a session * using compression. */ if (s->session->compress_meth != 0) { SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_INCONSISTENT_COMPRESSION); goto f_err; } #else j = *(p++); if (s->hit && j != s->session->compress_meth) { al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED); goto f_err; } if (j == 0) comp = NULL; else if (!ssl_allow_compression(s)) { al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_COMPRESSION_DISABLED); goto f_err; } else comp = ssl3_comp_find(s->ctx->comp_methods, j); if ((j != 0) && (comp == NULL)) { al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); goto f_err; } else { s->s3->tmp.new_compression = comp; } #endif /* TLS extensions */ if (!ssl_parse_serverhello_tlsext(s, &p, d, n)) { SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_PARSE_TLSEXT); goto err; } if (p != (d + n)) { /* wrong packet length */ al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_PACKET_LENGTH); goto f_err; } return (1); f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); err: s->state = SSL_ST_ERR; return (-1); } int ssl3_get_server_certificate(SSL *s) { int al, i, ok, ret = -1, exp_idx; unsigned long n, nc, llen, l; X509 *x = NULL; const unsigned char *q, *p; unsigned char *d; STACK_OF(X509) *sk = NULL; SESS_CERT *sc; EVP_PKEY *pkey = NULL; n = s->method->ssl_get_message(s, SSL3_ST_CR_CERT_A, SSL3_ST_CR_CERT_B, -1, s->max_cert_list, &ok); if (!ok) return ((int)n); if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { s->s3->tmp.reuse_message = 1; return (1); } if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE) { al = SSL_AD_UNEXPECTED_MESSAGE; SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_BAD_MESSAGE_TYPE); goto f_err; } p = d = (unsigned char *)s->init_msg; if ((sk = sk_X509_new_null()) == NULL) { SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE); goto err; } n2l3(p, llen); if (llen + 3 != n) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_LENGTH_MISMATCH); goto f_err; } for (nc = 0; nc < llen;) { n2l3(p, l); if ((l + nc + 3) > llen) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_CERT_LENGTH_MISMATCH); goto f_err; } q = p; x = d2i_X509(NULL, &q, l); if (x == NULL) { al = SSL_AD_BAD_CERTIFICATE; SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_ASN1_LIB); goto f_err; } if (q != (p + l)) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_CERT_LENGTH_MISMATCH); goto f_err; } if (!sk_X509_push(sk, x)) { SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE); goto err; } x = NULL; nc += l + 3; p = q; } i = ssl_verify_cert_chain(s, sk); if (s->verify_mode != SSL_VERIFY_NONE && i <= 0) { al = ssl_verify_alarm_type(s->verify_result); SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_CERTIFICATE_VERIFY_FAILED); goto f_err; } ERR_clear_error(); /* but we keep s->verify_result */ if (i > 1) { SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, i); al = SSL_AD_HANDSHAKE_FAILURE; goto f_err; } sc = ssl_sess_cert_new(); if (sc == NULL) goto err; ssl_sess_cert_free(s->session->sess_cert); s->session->sess_cert = sc; sc->cert_chain = sk; /* * Inconsistency alert: cert_chain does include the peer's certificate, * which we don't include in s3_srvr.c */ x = sk_X509_value(sk, 0); sk = NULL; /* * VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end */ pkey = X509_get_pubkey(x); if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { x = NULL; al = SSL3_AL_FATAL; SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); goto f_err; } i = ssl_cert_type(x, pkey); if (i < 0) { x = NULL; al = SSL3_AL_FATAL; SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_UNKNOWN_CERTIFICATE_TYPE); goto f_err; } exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher); if (exp_idx >= 0 && i != exp_idx) { x = NULL; al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_WRONG_CERTIFICATE_TYPE); goto f_err; } sc->peer_cert_type = i; CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); /* * Why would the following ever happen? We just created sc a couple * of lines ago. */ X509_free(sc->peer_pkeys[i].x509); sc->peer_pkeys[i].x509 = x; sc->peer_key = &(sc->peer_pkeys[i]); X509_free(s->session->peer); CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); s->session->peer = x; s->session->verify_result = s->verify_result; x = NULL; ret = 1; goto done; f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); err: s->state = SSL_ST_ERR; done: EVP_PKEY_free(pkey); X509_free(x); sk_X509_pop_free(sk, X509_free); return (ret); } int ssl3_get_key_exchange(SSL *s) { #ifndef OPENSSL_NO_RSA unsigned char *q, md_buf[EVP_MAX_MD_SIZE * 2]; #endif EVP_MD_CTX md_ctx; unsigned char *param, *p; int al, j, ok; long i, param_len, n, alg_k, alg_a; EVP_PKEY *pkey = NULL; const EVP_MD *md = NULL; #ifndef OPENSSL_NO_RSA RSA *rsa = NULL; #endif #ifndef OPENSSL_NO_DH DH *dh = NULL; #endif #ifndef OPENSSL_NO_EC EC_KEY *ecdh = NULL; BN_CTX *bn_ctx = NULL; EC_POINT *srvr_ecpoint = NULL; int curve_nid = 0; int encoded_pt_len = 0; #endif EVP_MD_CTX_init(&md_ctx); /* * use same message size as in ssl3_get_certificate_request() as * ServerKeyExchange message may be skipped */ n = s->method->ssl_get_message(s, SSL3_ST_CR_KEY_EXCH_A, SSL3_ST_CR_KEY_EXCH_B, -1, s->max_cert_list, &ok); if (!ok) return ((int)n); alg_k = s->s3->tmp.new_cipher->algorithm_mkey; if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { /* * Can't skip server key exchange if this is an ephemeral * ciphersuite. */ if (alg_k & (SSL_kDHE | SSL_kECDHE)) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE); al = SSL_AD_UNEXPECTED_MESSAGE; goto f_err; } #ifndef OPENSSL_NO_PSK /* * In plain PSK ciphersuite, ServerKeyExchange can be omitted if no * identity hint is sent. Set session->sess_cert anyway to avoid * problems later. */ if (alg_k & SSL_kPSK) { s->session->sess_cert = ssl_sess_cert_new(); OPENSSL_free(s->ctx->psk_identity_hint); s->ctx->psk_identity_hint = NULL; } #endif s->s3->tmp.reuse_message = 1; return (1); } param = p = (unsigned char *)s->init_msg; if (s->session->sess_cert != NULL) { #ifndef OPENSSL_NO_RSA RSA_free(s->session->sess_cert->peer_rsa_tmp); s->session->sess_cert->peer_rsa_tmp = NULL; #endif #ifndef OPENSSL_NO_DH DH_free(s->session->sess_cert->peer_dh_tmp); s->session->sess_cert->peer_dh_tmp = NULL; #endif #ifndef OPENSSL_NO_EC EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp); s->session->sess_cert->peer_ecdh_tmp = NULL; #endif } else { s->session->sess_cert = ssl_sess_cert_new(); } /* Total length of the parameters including the length prefix */ param_len = 0; alg_a = s->s3->tmp.new_cipher->algorithm_auth; al = SSL_AD_DECODE_ERROR; #ifndef OPENSSL_NO_PSK if (alg_k & SSL_kPSK) { char tmp_id_hint[PSK_MAX_IDENTITY_LEN + 1]; param_len = 2; if (param_len > n) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); goto f_err; } n2s(p, i); /* * Store PSK identity hint for later use, hint is used in * ssl3_send_client_key_exchange. Assume that the maximum length of * a PSK identity hint can be as long as the maximum length of a PSK * identity. */ if (i > PSK_MAX_IDENTITY_LEN) { al = SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_DATA_LENGTH_TOO_LONG); goto f_err; } if (i > n - param_len) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH); goto f_err; } param_len += i; /* * If received PSK identity hint contains NULL characters, the hint * is truncated from the first NULL. p may not be ending with NULL, * so create a NULL-terminated string. */ memcpy(tmp_id_hint, p, i); memset(tmp_id_hint + i, 0, PSK_MAX_IDENTITY_LEN + 1 - i); OPENSSL_free(s->ctx->psk_identity_hint); s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint); if (s->ctx->psk_identity_hint == NULL) { al = SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); goto f_err; } p += i; n -= param_len; } else #endif /* !OPENSSL_NO_PSK */ #ifndef OPENSSL_NO_SRP if (alg_k & SSL_kSRP) { param_len = 2; if (param_len > n) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); goto f_err; } n2s(p, i); if (i > n - param_len) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_N_LENGTH); goto f_err; } param_len += i; if ((s->srp_ctx.N = BN_bin2bn(p, i, NULL)) == NULL) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); goto err; } p += i; if (2 > n - param_len) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); goto f_err; } param_len += 2; n2s(p, i); if (i > n - param_len) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_G_LENGTH); goto f_err; } param_len += i; if ((s->srp_ctx.g = BN_bin2bn(p, i, NULL)) == NULL) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); goto err; } p += i; if (1 > n - param_len) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); goto f_err; } param_len += 1; i = (unsigned int)(p[0]); p++; if (i > n - param_len) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_S_LENGTH); goto f_err; } param_len += i; if ((s->srp_ctx.s = BN_bin2bn(p, i, NULL)) == NULL) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); goto err; } p += i; if (2 > n - param_len) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); goto f_err; } param_len += 2; n2s(p, i); if (i > n - param_len) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_B_LENGTH); goto f_err; } param_len += i; if ((s->srp_ctx.B = BN_bin2bn(p, i, NULL)) == NULL) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); goto err; } p += i; n -= param_len; if (!srp_verify_server_param(s, &al)) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_PARAMETERS); goto f_err; } /* We must check if there is a certificate */ # ifndef OPENSSL_NO_RSA if (alg_a & SSL_aRSA) pkey = X509_get_pubkey(s->session-> sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); # else if (0) ; # endif # ifndef OPENSSL_NO_DSA else if (alg_a & SSL_aDSS) pkey = X509_get_pubkey(s->session-> sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN]. x509); # endif } else #endif /* !OPENSSL_NO_SRP */ #ifndef OPENSSL_NO_RSA if (alg_k & SSL_kRSA) { /* Temporary RSA keys only allowed in export ciphersuites */ if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) { al = SSL_AD_UNEXPECTED_MESSAGE; SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE); goto f_err; } if ((rsa = RSA_new()) == NULL) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); goto err; } param_len = 2; if (param_len > n) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); goto f_err; } n2s(p, i); if (i > n - param_len) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_MODULUS_LENGTH); goto f_err; } param_len += i; if ((rsa->n = BN_bin2bn(p, i, rsa->n)) == NULL) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); goto err; } p += i; if (2 > n - param_len) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); goto f_err; } param_len += 2; n2s(p, i); if (i > n - param_len) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_E_LENGTH); goto f_err; } param_len += i; if ((rsa->e = BN_bin2bn(p, i, rsa->e)) == NULL) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); goto err; } p += i; n -= param_len; /* this should be because we are using an export cipher */ if (alg_a & SSL_aRSA) pkey = X509_get_pubkey(s->session-> sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); else { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } s->session->sess_cert->peer_rsa_tmp = rsa; rsa = NULL; } #else /* OPENSSL_NO_RSA */ if (0) ; #endif #ifndef OPENSSL_NO_DH else if (alg_k & SSL_kDHE) { if ((dh = DH_new()) == NULL) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_DH_LIB); goto err; } param_len = 2; if (param_len > n) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); goto f_err; } n2s(p, i); if (i > n - param_len) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_P_LENGTH); goto f_err; } param_len += i; if ((dh->p = BN_bin2bn(p, i, NULL)) == NULL) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); goto err; } p += i; if (2 > n - param_len) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); goto f_err; } param_len += 2; n2s(p, i); if (i > n - param_len) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_G_LENGTH); goto f_err; } param_len += i; if ((dh->g = BN_bin2bn(p, i, NULL)) == NULL) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); goto err; } p += i; if (2 > n - param_len) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); goto f_err; } param_len += 2; n2s(p, i); if (i > n - param_len) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_PUB_KEY_LENGTH); goto f_err; } param_len += i; if ((dh->pub_key = BN_bin2bn(p, i, NULL)) == NULL) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); goto err; } p += i; n -= param_len; if (!ssl_security(s, SSL_SECOP_TMP_DH, DH_security_bits(dh), 0, dh)) { al = SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_DH_KEY_TOO_SMALL); goto f_err; } # ifndef OPENSSL_NO_RSA if (alg_a & SSL_aRSA) pkey = X509_get_pubkey(s->session-> sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); # else if (0) ; # endif # ifndef OPENSSL_NO_DSA else if (alg_a & SSL_aDSS) pkey = X509_get_pubkey(s->session-> sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN]. x509); # endif /* else anonymous DH, so no certificate or pkey. */ s->session->sess_cert->peer_dh_tmp = dh; dh = NULL; } #endif /* !OPENSSL_NO_DH */ #ifndef OPENSSL_NO_EC else if (alg_k & SSL_kECDHE) { EC_GROUP *ngroup; const EC_GROUP *group; if ((ecdh = EC_KEY_new()) == NULL) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); goto err; } /* * Extract elliptic curve parameters and the server's ephemeral ECDH * public key. Keep accumulating lengths of various components in * param_len and make sure it never exceeds n. */ /* * XXX: For now we only support named (not generic) curves and the * ECParameters in this case is just three bytes. We also need one * byte for the length of the encoded point */ param_len = 4; if (param_len > n) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); goto f_err; } /* * Check curve is one of our preferences, if not server has sent an * invalid curve. ECParameters is 3 bytes. */ if (!tls1_check_curve(s, p, 3)) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_CURVE); goto f_err; } if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0) { al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); goto f_err; } ngroup = EC_GROUP_new_by_curve_name(curve_nid); if (ngroup == NULL) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB); goto err; } if (EC_KEY_set_group(ecdh, ngroup) == 0) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB); goto err; } EC_GROUP_free(ngroup); group = EC_KEY_get0_group(ecdh); if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && (EC_GROUP_get_degree(group) > 163)) { al = SSL_AD_EXPORT_RESTRICTION; SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER); goto f_err; } p += 3; /* Next, get the encoded ECPoint */ if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) || ((bn_ctx = BN_CTX_new()) == NULL)) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); goto err; } encoded_pt_len = *p; /* length of encoded point */ p += 1; if ((encoded_pt_len > n - param_len) || (EC_POINT_oct2point(group, srvr_ecpoint, p, encoded_pt_len, bn_ctx) == 0)) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_ECPOINT); goto f_err; } param_len += encoded_pt_len; n -= param_len; p += encoded_pt_len; /* * The ECC/TLS specification does not mention the use of DSA to sign * ECParameters in the server key exchange message. We do support RSA * and ECDSA. */ if (0) ; # ifndef OPENSSL_NO_RSA else if (alg_a & SSL_aRSA) pkey = X509_get_pubkey(s->session-> sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); # endif # ifndef OPENSSL_NO_EC else if (alg_a & SSL_aECDSA) pkey = X509_get_pubkey(s->session-> sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); # endif /* else anonymous ECDH, so no certificate or pkey. */ EC_KEY_set_public_key(ecdh, srvr_ecpoint); s->session->sess_cert->peer_ecdh_tmp = ecdh; ecdh = NULL; BN_CTX_free(bn_ctx); bn_ctx = NULL; EC_POINT_free(srvr_ecpoint); srvr_ecpoint = NULL; } else if (alg_k) { al = SSL_AD_UNEXPECTED_MESSAGE; SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE); goto f_err; } #endif /* !OPENSSL_NO_EC */ /* p points to the next byte, there are 'n' bytes left */ /* if it was signed, check the signature */ if (pkey != NULL) { if (SSL_USE_SIGALGS(s)) { int rv; if (2 > n) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); goto f_err; } rv = tls12_check_peer_sigalg(&md, s, p, pkey); if (rv == -1) goto err; else if (rv == 0) { goto f_err; } #ifdef SSL_DEBUG fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md)); #endif p += 2; n -= 2; } else md = EVP_sha1(); if (2 > n) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); goto f_err; } n2s(p, i); n -= 2; j = EVP_PKEY_size(pkey); /* * Check signature length. If n is 0 then signature is empty */ if ((i != n) || (n > j) || (n <= 0)) { /* wrong packet length */ SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_SIGNATURE_LENGTH); goto f_err; } #ifndef OPENSSL_NO_RSA if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s)) { int num; unsigned int size; j = 0; q = md_buf; for (num = 2; num > 0; num--) { EVP_MD_CTX_set_flags(&md_ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); EVP_DigestInit_ex(&md_ctx, (num == 2) ? s->ctx->md5 : s->ctx->sha1, NULL); EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]), SSL3_RANDOM_SIZE); EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]), SSL3_RANDOM_SIZE); EVP_DigestUpdate(&md_ctx, param, param_len); EVP_DigestFinal_ex(&md_ctx, q, &size); q += size; j += size; } i = RSA_verify(NID_md5_sha1, md_buf, j, p, n, pkey->pkey.rsa); if (i < 0) { al = SSL_AD_DECRYPT_ERROR; SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_DECRYPT); goto f_err; } if (i == 0) { /* bad signature */ al = SSL_AD_DECRYPT_ERROR; SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE); goto f_err; } } else #endif { EVP_VerifyInit_ex(&md_ctx, md, NULL); EVP_VerifyUpdate(&md_ctx, &(s->s3->client_random[0]), SSL3_RANDOM_SIZE); EVP_VerifyUpdate(&md_ctx, &(s->s3->server_random[0]), SSL3_RANDOM_SIZE); EVP_VerifyUpdate(&md_ctx, param, param_len); if (EVP_VerifyFinal(&md_ctx, p, (int)n, pkey) <= 0) { /* bad signature */ al = SSL_AD_DECRYPT_ERROR; SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE); goto f_err; } } } else { /* aNULL, aSRP or kPSK do not need public keys */ if (!(alg_a & (SSL_aNULL | SSL_aSRP)) && !(alg_k & SSL_kPSK)) { /* Might be wrong key type, check it */ if (ssl3_check_cert_and_algorithm(s)) /* Otherwise this shouldn't happen */ SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } /* still data left over */ if (n != 0) { SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_EXTRA_DATA_IN_MESSAGE); goto f_err; } } EVP_PKEY_free(pkey); EVP_MD_CTX_cleanup(&md_ctx); return (1); f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); err: EVP_PKEY_free(pkey); #ifndef OPENSSL_NO_RSA RSA_free(rsa); #endif #ifndef OPENSSL_NO_DH DH_free(dh); #endif #ifndef OPENSSL_NO_EC BN_CTX_free(bn_ctx); EC_POINT_free(srvr_ecpoint); EC_KEY_free(ecdh); #endif EVP_MD_CTX_cleanup(&md_ctx); s->state = SSL_ST_ERR; return (-1); } int ssl3_get_certificate_request(SSL *s) { int ok, ret = 0; unsigned long n, nc, l; unsigned int llen, ctype_num, i; X509_NAME *xn = NULL; const unsigned char *p, *q; unsigned char *d; STACK_OF(X509_NAME) *ca_sk = NULL; n = s->method->ssl_get_message(s, SSL3_ST_CR_CERT_REQ_A, SSL3_ST_CR_CERT_REQ_B, -1, s->max_cert_list, &ok); if (!ok) return ((int)n); s->s3->tmp.cert_req = 0; if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE) { s->s3->tmp.reuse_message = 1; /* * If we get here we don't need any cached handshake records as we * wont be doing client auth. */ if (s->s3->handshake_buffer) { if (!ssl3_digest_cached_records(s)) goto err; } return (1); } if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_WRONG_MESSAGE_TYPE); goto err; } /* TLS does not like anon-DH with client cert */ if (s->version > SSL3_VERSION) { if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); goto err; } } p = d = (unsigned char *)s->init_msg; if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE); goto err; } /* get the certificate types */ ctype_num = *(p++); OPENSSL_free(s->cert->ctypes); s->cert->ctypes = NULL; if (ctype_num > SSL3_CT_NUMBER) { /* If we exceed static buffer copy all to cert structure */ s->cert->ctypes = OPENSSL_malloc(ctype_num); if (s->cert->ctypes == NULL) { SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE); goto err; } memcpy(s->cert->ctypes, p, ctype_num); s->cert->ctype_num = (size_t)ctype_num; ctype_num = SSL3_CT_NUMBER; } for (i = 0; i < ctype_num; i++) s->s3->tmp.ctype[i] = p[i]; p += p[-1]; if (SSL_USE_SIGALGS(s)) { n2s(p, llen); /* * Check we have enough room for signature algorithms and following * length value. */ if ((unsigned long)(p - d + llen + 2) > n) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_DATA_LENGTH_TOO_LONG); goto err; } /* Clear certificate digests and validity flags */ for (i = 0; i < SSL_PKEY_NUM; i++) { s->s3->tmp.md[i] = NULL; s->s3->tmp.valid_flags[i] = 0; } if ((llen & 1) || !tls1_save_sigalgs(s, p, llen)) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_SIGNATURE_ALGORITHMS_ERROR); goto err; } if (!tls1_process_sigalgs(s)) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE); goto err; } p += llen; } /* get the CA RDNs */ n2s(p, llen); if ((unsigned long)(p - d + llen) != n) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_LENGTH_MISMATCH); goto err; } for (nc = 0; nc < llen;) { n2s(p, l); if ((l + nc + 2) > llen) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_CA_DN_TOO_LONG); goto err; } q = p; if ((xn = d2i_X509_NAME(NULL, &q, l)) == NULL) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_ASN1_LIB); goto err; } if (q != (p + l)) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_CA_DN_LENGTH_MISMATCH); goto err; } if (!sk_X509_NAME_push(ca_sk, xn)) { SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE); goto err; } p += l; nc += l + 2; } /* we should setup a certificate to return.... */ s->s3->tmp.cert_req = 1; s->s3->tmp.ctype_num = ctype_num; sk_X509_NAME_pop_free(s->s3->tmp.ca_names, X509_NAME_free); s->s3->tmp.ca_names = ca_sk; ca_sk = NULL; ret = 1; goto done; err: s->state = SSL_ST_ERR; done: sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); return (ret); } static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b) { return (X509_NAME_cmp(*a, *b)); } int ssl3_get_new_session_ticket(SSL *s) { int ok, al, ret = 0, ticklen; long n; const unsigned char *p; unsigned char *d; n = s->method->ssl_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, SSL3_ST_CR_SESSION_TICKET_B, SSL3_MT_NEWSESSION_TICKET, 16384, &ok); if (!ok) return ((int)n); if (n < 6) { /* need at least ticket_lifetime_hint + ticket length */ al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH); goto f_err; } p = d = (unsigned char *)s->init_msg; n2l(p, s->session->tlsext_tick_lifetime_hint); n2s(p, ticklen); /* ticket_lifetime_hint + ticket_length + ticket */ if (ticklen + 6 != n) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH); goto f_err; } OPENSSL_free(s->session->tlsext_tick); s->session->tlsext_ticklen = 0; s->session->tlsext_tick = OPENSSL_malloc(ticklen); if (!s->session->tlsext_tick) { SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE); goto err; } memcpy(s->session->tlsext_tick, p, ticklen); s->session->tlsext_ticklen = ticklen; /* * There are two ways to detect a resumed ticket session. One is to set * an appropriate session ID and then the server must return a match in * ServerHello. This allows the normal client session ID matching to work * and we know much earlier that the ticket has been accepted. The * other way is to set zero length session ID when the ticket is * presented and rely on the handshake to determine session resumption. * We choose the former approach because this fits in with assumptions * elsewhere in OpenSSL. The session ID is set to the SHA256 (or SHA1 is * SHA256 is disabled) hash of the ticket. */ EVP_Digest(p, ticklen, s->session->session_id, &s->session->session_id_length, EVP_sha256(), NULL); ret = 1; return (ret); f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); err: s->state = SSL_ST_ERR; return (-1); } int ssl3_get_cert_status(SSL *s) { int ok, al; unsigned long resplen, n; const unsigned char *p; n = s->method->ssl_get_message(s, SSL3_ST_CR_CERT_STATUS_A, SSL3_ST_CR_CERT_STATUS_B, SSL3_MT_CERTIFICATE_STATUS, 16384, &ok); if (!ok) return ((int)n); if (n < 4) { /* need at least status type + length */ al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH); goto f_err; } p = (unsigned char *)s->init_msg; if (*p++ != TLSEXT_STATUSTYPE_ocsp) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_UNSUPPORTED_STATUS_TYPE); goto f_err; } n2l3(p, resplen); if (resplen + 4 != n) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH); goto f_err; } OPENSSL_free(s->tlsext_ocsp_resp); s->tlsext_ocsp_resp = BUF_memdup(p, resplen); if (!s->tlsext_ocsp_resp) { al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE); goto f_err; } s->tlsext_ocsp_resplen = resplen; if (s->ctx->tlsext_status_cb) { int ret; ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); if (ret == 0) { al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_INVALID_STATUS_RESPONSE); goto f_err; } if (ret < 0) { al = SSL_AD_INTERNAL_ERROR; SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE); goto f_err; } } return 1; f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); s->state = SSL_ST_ERR; return (-1); } int ssl3_get_server_done(SSL *s) { int ok, ret = 0; long n; /* Second to last param should be very small, like 0 :-) */ n = s->method->ssl_get_message(s, SSL3_ST_CR_SRVR_DONE_A, SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 30, &ok); if (!ok) return ((int)n); if (n > 0) { /* should contain no data */ ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); SSLerr(SSL_F_SSL3_GET_SERVER_DONE, SSL_R_LENGTH_MISMATCH); s->state = SSL_ST_ERR; return -1; } ret = 1; return (ret); } int ssl3_send_client_key_exchange(SSL *s) { unsigned char *p; int n; unsigned long alg_k; #ifndef OPENSSL_NO_RSA unsigned char *q; EVP_PKEY *pkey = NULL; #endif #ifndef OPENSSL_NO_EC EC_KEY *clnt_ecdh = NULL; const EC_POINT *srvr_ecpoint = NULL; EVP_PKEY *srvr_pub_pkey = NULL; unsigned char *encodedPoint = NULL; int encoded_pt_len = 0; BN_CTX *bn_ctx = NULL; #endif unsigned char *pms = NULL; size_t pmslen = 0; if (s->state == SSL3_ST_CW_KEY_EXCH_A) { p = ssl_handshake_start(s); alg_k = s->s3->tmp.new_cipher->algorithm_mkey; /* Fool emacs indentation */ if (0) { } #ifndef OPENSSL_NO_RSA else if (alg_k & SSL_kRSA) { RSA *rsa; pmslen = SSL_MAX_MASTER_KEY_LENGTH; pms = OPENSSL_malloc(pmslen); if (!pms) goto memerr; if (s->session->sess_cert == NULL) { /* * We should always have a server certificate with SSL_kRSA. */ SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } if (s->session->sess_cert->peer_rsa_tmp != NULL) rsa = s->session->sess_cert->peer_rsa_tmp; else { pkey = X509_get_pubkey(s->session-> sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC]. x509); if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA) || (pkey->pkey.rsa == NULL)) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } rsa = pkey->pkey.rsa; EVP_PKEY_free(pkey); } pms[0] = s->client_version >> 8; pms[1] = s->client_version & 0xff; if (RAND_bytes(pms + 2, pmslen - 2) <= 0) goto err; q = p; /* Fix buf for TLS and beyond */ if (s->version > SSL3_VERSION) p += 2; n = RSA_public_encrypt(pmslen, pms, p, rsa, RSA_PKCS1_PADDING); # ifdef PKCS1_CHECK if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++; if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0] = 0x70; # endif if (n <= 0) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, SSL_R_BAD_RSA_ENCRYPT); goto err; } /* Fix buf for TLS and beyond */ if (s->version > SSL3_VERSION) { s2n(n, q); n += 2; } } #endif #ifndef OPENSSL_NO_DH else if (alg_k & (SSL_kDHE | SSL_kDHr | SSL_kDHd)) { DH *dh_srvr, *dh_clnt; SESS_CERT *scert = s->session->sess_cert; if (scert == NULL) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE); goto err; } if (scert->peer_dh_tmp != NULL) dh_srvr = scert->peer_dh_tmp; else { /* we get them from the cert */ int idx = scert->peer_cert_type; EVP_PKEY *spkey = NULL; dh_srvr = NULL; if (idx >= 0) spkey = X509_get_pubkey(scert->peer_pkeys[idx].x509); if (spkey) { dh_srvr = EVP_PKEY_get1_DH(spkey); EVP_PKEY_free(spkey); } if (dh_srvr == NULL) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } } if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) { /* Use client certificate key */ EVP_PKEY *clkey = s->cert->key->privatekey; dh_clnt = NULL; if (clkey) dh_clnt = EVP_PKEY_get1_DH(clkey); if (dh_clnt == NULL) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } } else { /* generate a new random key */ if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); goto err; } if (!DH_generate_key(dh_clnt)) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); DH_free(dh_clnt); goto err; } } pmslen = DH_size(dh_clnt); pms = OPENSSL_malloc(pmslen); if (!pms) goto memerr; /* * use the 'p' output buffer for the DH key, but make sure to * clear it out afterwards */ n = DH_compute_key(pms, dh_srvr->pub_key, dh_clnt); if (scert->peer_dh_tmp == NULL) DH_free(dh_srvr); if (n <= 0) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); DH_free(dh_clnt); goto err; } pmslen = n; if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) n = 0; else { /* send off the data */ n = BN_num_bytes(dh_clnt->pub_key); s2n(n, p); BN_bn2bin(dh_clnt->pub_key, p); n += 2; } DH_free(dh_clnt); /* perhaps clean things up a bit EAY EAY EAY EAY */ } #endif #ifndef OPENSSL_NO_EC else if (alg_k & (SSL_kECDHE | SSL_kECDHr | SSL_kECDHe)) { const EC_GROUP *srvr_group = NULL; EC_KEY *tkey; int ecdh_clnt_cert = 0; int field_size = 0; if (s->session->sess_cert == NULL) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE); goto err; } /* * Did we send out the client's ECDH share for use in premaster * computation as part of client certificate? If so, set * ecdh_clnt_cert to 1. */ if ((alg_k & (SSL_kECDHr | SSL_kECDHe)) && (s->cert != NULL)) { /*- * XXX: For now, we do not support client * authentication using ECDH certificates. * To add such support, one needs to add * code that checks for appropriate * conditions and sets ecdh_clnt_cert to 1. * For example, the cert have an ECC * key on the same curve as the server's * and the key should be authorized for * key agreement. * * One also needs to add code in ssl3_connect * to skip sending the certificate verify * message. * * if ((s->cert->key->privatekey != NULL) && * (s->cert->key->privatekey->type == * EVP_PKEY_EC) && ...) * ecdh_clnt_cert = 1; */ } if (s->session->sess_cert->peer_ecdh_tmp != NULL) { tkey = s->session->sess_cert->peer_ecdh_tmp; } else { /* Get the Server Public Key from Cert */ srvr_pub_pkey = X509_get_pubkey(s->session-> sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); if ((srvr_pub_pkey == NULL) || (srvr_pub_pkey->type != EVP_PKEY_EC) || (srvr_pub_pkey->pkey.ec == NULL)) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } tkey = srvr_pub_pkey->pkey.ec; } srvr_group = EC_KEY_get0_group(tkey); srvr_ecpoint = EC_KEY_get0_public_key(tkey); if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } if ((clnt_ecdh = EC_KEY_new()) == NULL) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); goto err; } if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); goto err; } if (ecdh_clnt_cert) { /* * Reuse key info from our certificate We only need our * private key to perform the ECDH computation. */ const BIGNUM *priv_key; tkey = s->cert->key->privatekey->pkey.ec; priv_key = EC_KEY_get0_private_key(tkey); if (priv_key == NULL) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); goto err; } if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); goto err; } } else { /* Generate a new ECDH key pair */ if (!(EC_KEY_generate_key(clnt_ecdh))) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); goto err; } } /* * use the 'p' output buffer for the ECDH key, but make sure to * clear it out afterwards */ field_size = EC_GROUP_get_degree(srvr_group); if (field_size <= 0) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); goto err; } pmslen = (field_size + 7) / 8; pms = OPENSSL_malloc(pmslen); if (!pms) goto memerr; n = ECDH_compute_key(pms, pmslen, srvr_ecpoint, clnt_ecdh, NULL); if (n <= 0 || pmslen != (size_t)n) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); goto err; } if (ecdh_clnt_cert) { /* Send empty client key exch message */ n = 0; } else { /* * First check the size of encoding and allocate memory * accordingly. */ encoded_pt_len = EC_POINT_point2oct(srvr_group, EC_KEY_get0_public_key(clnt_ecdh), POINT_CONVERSION_UNCOMPRESSED, NULL, 0, NULL); encodedPoint = (unsigned char *) OPENSSL_malloc(encoded_pt_len * sizeof(unsigned char)); bn_ctx = BN_CTX_new(); if ((encodedPoint == NULL) || (bn_ctx == NULL)) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); goto err; } /* Encode the public key */ n = EC_POINT_point2oct(srvr_group, EC_KEY_get0_public_key(clnt_ecdh), POINT_CONVERSION_UNCOMPRESSED, encodedPoint, encoded_pt_len, bn_ctx); *p = n; /* length of encoded point */ /* Encoded point will be copied here */ p += 1; /* copy the point */ memcpy(p, encodedPoint, n); /* increment n to account for length field */ n += 1; } /* Free allocated memory */ BN_CTX_free(bn_ctx); OPENSSL_free(encodedPoint); EC_KEY_free(clnt_ecdh); EVP_PKEY_free(srvr_pub_pkey); } #endif /* !OPENSSL_NO_EC */ else if (alg_k & SSL_kGOST) { /* GOST key exchange message creation */ EVP_PKEY_CTX *pkey_ctx; X509 *peer_cert; size_t msglen; unsigned int md_len; int keytype; unsigned char shared_ukm[32], tmp[256]; EVP_MD_CTX *ukm_hash; EVP_PKEY *pub_key; pmslen = 32; pms = OPENSSL_malloc(pmslen); if (!pms) goto memerr; /* * Get server sertificate PKEY and create ctx from it */ peer_cert = s->session-> sess_cert->peer_pkeys[(keytype = SSL_PKEY_GOST01)].x509; if (!peer_cert) peer_cert = s->session-> sess_cert->peer_pkeys[(keytype = SSL_PKEY_GOST94)].x509; if (!peer_cert) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); goto err; } pkey_ctx = EVP_PKEY_CTX_new(pub_key = X509_get_pubkey(peer_cert), NULL); /* * If we have send a certificate, and certificate key * * * parameters match those of server certificate, use * certificate key for key exchange */ /* Otherwise, generate ephemeral key pair */ EVP_PKEY_encrypt_init(pkey_ctx); /* Generate session key */ if (RAND_bytes(pms, pmslen) <= 0) { EVP_PKEY_CTX_free(pkey_ctx); SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; }; /* * If we have client certificate, use its secret as peer key */ if (s->s3->tmp.cert_req && s->cert->key->privatekey) { if (EVP_PKEY_derive_set_peer (pkey_ctx, s->cert->key->privatekey) <= 0) { /* * If there was an error - just ignore it. Ephemeral key * * would be used */ ERR_clear_error(); } } /* * Compute shared IV and store it in algorithm-specific context * data */ ukm_hash = EVP_MD_CTX_create(); EVP_DigestInit(ukm_hash, EVP_get_digestbynid(NID_id_GostR3411_94)); EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE); EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE); EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); EVP_MD_CTX_destroy(ukm_hash); if (EVP_PKEY_CTX_ctrl (pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, SSL_R_LIBRARY_BUG); goto err; } /* Make GOST keytransport blob message */ /* * Encapsulate it into sequence */ *(p++) = V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED; msglen = 255; if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, pms, pmslen) < 0) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, SSL_R_LIBRARY_BUG); goto err; } if (msglen >= 0x80) { *(p++) = 0x81; *(p++) = msglen & 0xff; n = msglen + 3; } else { *(p++) = msglen & 0xff; n = msglen + 2; } memcpy(p, tmp, msglen); /* Check if pubkey from client certificate was used */ if (EVP_PKEY_CTX_ctrl (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) { /* Set flag "skip certificate verify" */ s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; } EVP_PKEY_CTX_free(pkey_ctx); EVP_PKEY_free(pub_key); } #ifndef OPENSSL_NO_SRP else if (alg_k & SSL_kSRP) { if (s->srp_ctx.A != NULL) { /* send off the data */ n = BN_num_bytes(s->srp_ctx.A); s2n(n, p); BN_bn2bin(s->srp_ctx.A, p); n += 2; } else { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } OPENSSL_free(s->session->srp_username); s->session->srp_username = BUF_strdup(s->srp_ctx.login); if (s->session->srp_username == NULL) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); goto err; } } #endif #ifndef OPENSSL_NO_PSK else if (alg_k & SSL_kPSK) { /* * The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes to return a * \0-terminated identity. The last byte is for us for simulating * strnlen. */ char identity[PSK_MAX_IDENTITY_LEN + 2]; size_t identity_len; unsigned char *t = NULL; unsigned int psk_len = 0; int psk_err = 1; n = 0; if (s->psk_client_callback == NULL) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, SSL_R_PSK_NO_CLIENT_CB); goto err; } memset(identity, 0, sizeof(identity)); /* Allocate maximum size buffer */ pmslen = PSK_MAX_PSK_LEN * 2 + 4; pms = OPENSSL_malloc(pmslen); if (!pms) goto memerr; psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint, identity, sizeof(identity) - 1, pms, pmslen); if (psk_len > PSK_MAX_PSK_LEN) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto psk_err; } else if (psk_len == 0) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, SSL_R_PSK_IDENTITY_NOT_FOUND); goto psk_err; } /* Change pmslen to real length */ pmslen = 2 + psk_len + 2 + psk_len; identity[PSK_MAX_IDENTITY_LEN + 1] = '\0'; identity_len = strlen(identity); if (identity_len > PSK_MAX_IDENTITY_LEN) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto psk_err; } /* create PSK pre_master_secret */ t = pms; memmove(pms + psk_len + 4, pms, psk_len); s2n(psk_len, t); memset(t, 0, psk_len); t += psk_len; s2n(psk_len, t); OPENSSL_free(s->session->psk_identity_hint); s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint); if (s->ctx->psk_identity_hint != NULL && s->session->psk_identity_hint == NULL) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); goto psk_err; } OPENSSL_free(s->session->psk_identity); s->session->psk_identity = BUF_strdup(identity); if (s->session->psk_identity == NULL) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); goto psk_err; } s2n(identity_len, p); memcpy(p, identity, identity_len); n = 2 + identity_len; psk_err = 0; psk_err: OPENSSL_cleanse(identity, sizeof(identity)); if (psk_err != 0) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); goto err; } } #endif else { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } if (!ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n)) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } s->state = SSL3_ST_CW_KEY_EXCH_B; } /* SSL3_ST_CW_KEY_EXCH_B */ n = ssl_do_write(s); #ifndef OPENSSL_NO_SRP /* Check for SRP */ if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) { /* * If everything written generate master key: no need to save PMS as * SRP_generate_client_master_secret generates it internally. */ if (n > 0) { if ((s->session->master_key_length = SRP_generate_client_master_secret(s, s->session->master_key)) < 0) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } } } else #endif /* If we haven't written everything save PMS */ if (n <= 0) { s->s3->tmp.pms = pms; s->s3->tmp.pmslen = pmslen; } else { /* If we don't have a PMS restore */ if (pms == NULL) { pms = s->s3->tmp.pms; pmslen = s->s3->tmp.pmslen; } if (pms == NULL) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); goto err; } s->session->master_key_length = s->method->ssl3_enc->generate_master_secret(s, s-> session->master_key, pms, pmslen); OPENSSL_clear_free(pms, pmslen); s->s3->tmp.pms = NULL; if (s->session->master_key_length < 0) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } } return n; memerr: ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); err: OPENSSL_clear_free(pms, pmslen); s->s3->tmp.pms = NULL; #ifndef OPENSSL_NO_EC BN_CTX_free(bn_ctx); OPENSSL_free(encodedPoint); EC_KEY_free(clnt_ecdh); EVP_PKEY_free(srvr_pub_pkey); #endif s->state = SSL_ST_ERR; return (-1); } int ssl3_send_client_verify(SSL *s) { unsigned char *p; unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH]; EVP_PKEY *pkey; EVP_PKEY_CTX *pctx = NULL; EVP_MD_CTX mctx; unsigned u = 0; unsigned long n; int j; EVP_MD_CTX_init(&mctx); if (s->state == SSL3_ST_CW_CERT_VRFY_A) { p = ssl_handshake_start(s); pkey = s->cert->key->privatekey; /* Create context from key and test if sha1 is allowed as digest */ pctx = EVP_PKEY_CTX_new(pkey, NULL); EVP_PKEY_sign_init(pctx); if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1()) > 0) { if (!SSL_USE_SIGALGS(s)) s->method->ssl3_enc->cert_verify_mac(s, NID_sha1, &(data [MD5_DIGEST_LENGTH])); } else { ERR_clear_error(); } /* * For TLS v1.2 send signature algorithm and signature using agreed * digest and cached handshake records. */ if (SSL_USE_SIGALGS(s)) { long hdatalen = 0; void *hdata; const EVP_MD *md = s->s3->tmp.md[s->cert->key - s->cert->pkeys]; hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata); if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md)) { SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR); goto err; } p += 2; #ifdef SSL_DEBUG fprintf(stderr, "Using TLS 1.2 with client alg %s\n", EVP_MD_name(md)); #endif if (!EVP_SignInit_ex(&mctx, md, NULL) || !EVP_SignUpdate(&mctx, hdata, hdatalen) || !EVP_SignFinal(&mctx, p + 2, &u, pkey)) { SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_EVP_LIB); goto err; } s2n(u, p); n = u + 4; /* * For extended master secret we've already digested cached * records. */ if (s->session->flags & SSL_SESS_FLAG_EXTMS) { BIO_free(s->s3->handshake_buffer); s->s3->handshake_buffer = NULL; s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE; } else if (!ssl3_digest_cached_records(s)) goto err; } else #ifndef OPENSSL_NO_RSA if (pkey->type == EVP_PKEY_RSA) { s->method->ssl3_enc->cert_verify_mac(s, NID_md5, &(data[0])); if (RSA_sign(NID_md5_sha1, data, MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, &(p[2]), &u, pkey->pkey.rsa) <= 0) { SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB); goto err; } s2n(u, p); n = u + 2; } else #endif #ifndef OPENSSL_NO_DSA if (pkey->type == EVP_PKEY_DSA) { if (!DSA_sign(pkey->save_type, &(data[MD5_DIGEST_LENGTH]), SHA_DIGEST_LENGTH, &(p[2]), (unsigned int *)&j, pkey->pkey.dsa)) { SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB); goto err; } s2n(j, p); n = j + 2; } else #endif #ifndef OPENSSL_NO_EC if (pkey->type == EVP_PKEY_EC) { if (!ECDSA_sign(pkey->save_type, &(data[MD5_DIGEST_LENGTH]), SHA_DIGEST_LENGTH, &(p[2]), (unsigned int *)&j, pkey->pkey.ec)) { SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_ECDSA_LIB); goto err; } s2n(j, p); n = j + 2; } else #endif if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001) { unsigned char signbuf[64]; int i; size_t sigsize = 64; s->method->ssl3_enc->cert_verify_mac(s, NID_id_GostR3411_94, data); if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) { SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR); goto err; } for (i = 63, j = 0; i >= 0; j++, i--) { p[2 + j] = signbuf[i]; } s2n(j, p); n = j + 2; } else { SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR); goto err; } if (!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n)) { SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR); goto err; } s->state = SSL3_ST_CW_CERT_VRFY_B; } EVP_MD_CTX_cleanup(&mctx); EVP_PKEY_CTX_free(pctx); return ssl_do_write(s); err: EVP_MD_CTX_cleanup(&mctx); EVP_PKEY_CTX_free(pctx); s->state = SSL_ST_ERR; return (-1); } /* * Check a certificate can be used for client authentication. Currently check * cert exists, if we have a suitable digest for TLS 1.2 if static DH client * certificates can be used and optionally checks suitability for Suite B. */ static int ssl3_check_client_certificate(SSL *s) { unsigned long alg_k; if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey) return 0; /* If no suitable signature algorithm can't use certificate */ if (SSL_USE_SIGALGS(s) && !s->s3->tmp.md[s->cert->key - s->cert->pkeys]) return 0; /* * If strict mode check suitability of chain before using it. This also * adjusts suite B digest if necessary. */ if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT && !tls1_check_chain(s, NULL, NULL, NULL, -2)) return 0; alg_k = s->s3->tmp.new_cipher->algorithm_mkey; /* See if we can use client certificate for fixed DH */ if (alg_k & (SSL_kDHr | SSL_kDHd)) { SESS_CERT *scert = s->session->sess_cert; int i = scert->peer_cert_type; EVP_PKEY *clkey = NULL, *spkey = NULL; clkey = s->cert->key->privatekey; /* If client key not DH assume it can be used */ if (EVP_PKEY_id(clkey) != EVP_PKEY_DH) return 1; if (i >= 0) spkey = X509_get_pubkey(scert->peer_pkeys[i].x509); if (spkey) { /* Compare server and client parameters */ i = EVP_PKEY_cmp_parameters(clkey, spkey); EVP_PKEY_free(spkey); if (i != 1) return 0; } s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; } return 1; } int ssl3_send_client_certificate(SSL *s) { X509 *x509 = NULL; EVP_PKEY *pkey = NULL; int i; if (s->state == SSL3_ST_CW_CERT_A) { /* Let cert callback update client certificates if required */ if (s->cert->cert_cb) { i = s->cert->cert_cb(s, s->cert->cert_cb_arg); if (i < 0) { s->rwstate = SSL_X509_LOOKUP; return -1; } if (i == 0) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); s->state = SSL_ST_ERR; return 0; } s->rwstate = SSL_NOTHING; } if (ssl3_check_client_certificate(s)) s->state = SSL3_ST_CW_CERT_C; else s->state = SSL3_ST_CW_CERT_B; } /* We need to get a client cert */ if (s->state == SSL3_ST_CW_CERT_B) { /* * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP; * return(-1); We then get retied later */ i = 0; i = ssl_do_client_cert_cb(s, &x509, &pkey); if (i < 0) { s->rwstate = SSL_X509_LOOKUP; return (-1); } s->rwstate = SSL_NOTHING; if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { s->state = SSL3_ST_CW_CERT_B; if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey)) i = 0; } else if (i == 1) { i = 0; SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); } X509_free(x509); EVP_PKEY_free(pkey); if (i && !ssl3_check_client_certificate(s)) i = 0; if (i == 0) { if (s->version == SSL3_VERSION) { s->s3->tmp.cert_req = 0; ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE); return (1); } else { s->s3->tmp.cert_req = 2; if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s)) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); s->state = SSL_ST_ERR; return 0; } } } /* Ok, we have a cert */ s->state = SSL3_ST_CW_CERT_C; } if (s->state == SSL3_ST_CW_CERT_C) { s->state = SSL3_ST_CW_CERT_D; if (!ssl3_output_cert_chain(s, (s->s3->tmp.cert_req == 2) ? NULL : s->cert->key)) { SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR); ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); s->state = SSL_ST_ERR; return 0; } } /* SSL3_ST_CW_CERT_D */ return ssl_do_write(s); } #define has_bits(i,m) (((i)&(m)) == (m)) int ssl3_check_cert_and_algorithm(SSL *s) { int i, idx; long alg_k, alg_a; EVP_PKEY *pkey = NULL; int pkey_bits; SESS_CERT *sc; #ifndef OPENSSL_NO_RSA RSA *rsa; #endif #ifndef OPENSSL_NO_DH DH *dh; #endif alg_k = s->s3->tmp.new_cipher->algorithm_mkey; alg_a = s->s3->tmp.new_cipher->algorithm_auth; /* we don't have a certificate */ if ((alg_a & SSL_aNULL) || (alg_k & SSL_kPSK)) return (1); sc = s->session->sess_cert; if (sc == NULL) { SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR); goto err; } #ifndef OPENSSL_NO_RSA rsa = s->session->sess_cert->peer_rsa_tmp; #endif #ifndef OPENSSL_NO_DH dh = s->session->sess_cert->peer_dh_tmp; #endif /* This is the passed certificate */ idx = sc->peer_cert_type; #ifndef OPENSSL_NO_EC if (idx == SSL_PKEY_ECC) { if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509, s) == 0) { /* check failed */ SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_BAD_ECC_CERT); goto f_err; } else { return 1; } } else if (alg_a & SSL_aECDSA) { SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_ECDSA_SIGNING_CERT); goto f_err; } else if (alg_k & (SSL_kECDHr | SSL_kECDHe)) { SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_ECDH_CERT); goto f_err; } #endif pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); pkey_bits = EVP_PKEY_bits(pkey); i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); EVP_PKEY_free(pkey); /* Check that we have a certificate if we require one */ if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA | EVP_PKT_SIGN)) { SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_RSA_SIGNING_CERT); goto f_err; } #ifndef OPENSSL_NO_DSA else if ((alg_a & SSL_aDSS) && !has_bits(i, EVP_PK_DSA | EVP_PKT_SIGN)) { SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_DSA_SIGNING_CERT); goto f_err; } #endif #ifndef OPENSSL_NO_RSA if ((alg_k & SSL_kRSA) && !(has_bits(i, EVP_PK_RSA | EVP_PKT_ENC) || (rsa != NULL))) { SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_RSA_ENCRYPTING_CERT); goto f_err; } #endif #ifndef OPENSSL_NO_DH if ((alg_k & SSL_kDHE) && !(has_bits(i, EVP_PK_DH | EVP_PKT_EXCH) || (dh != NULL))) { SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_DH_KEY); goto f_err; } else if ((alg_k & SSL_kDHr) && !SSL_USE_SIGALGS(s) && !has_bits(i, EVP_PK_DH | EVP_PKS_RSA)) { SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_DH_RSA_CERT); goto f_err; } # ifndef OPENSSL_NO_DSA else if ((alg_k & SSL_kDHd) && !SSL_USE_SIGALGS(s) && !has_bits(i, EVP_PK_DH | EVP_PKS_DSA)) { SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_DH_DSA_CERT); goto f_err; } # endif #endif if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && pkey_bits > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) { #ifndef OPENSSL_NO_RSA if (alg_k & SSL_kRSA) { if (rsa == NULL || RSA_size(rsa) * 8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) { SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_EXPORT_TMP_RSA_KEY); goto f_err; } } else #endif #ifndef OPENSSL_NO_DH if (alg_k & (SSL_kDHE | SSL_kDHr | SSL_kDHd)) { if (dh == NULL || DH_size(dh) * 8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) { SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_EXPORT_TMP_DH_KEY); goto f_err; } } else #endif { SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); goto f_err; } } return (1); f_err: ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); err: return (0); } /* * Normally, we can tell if the server is resuming the session from * the session ID. EAP-FAST (RFC 4851), however, relies on the next server * message after the ServerHello to determine if the server is resuming. * Therefore, we allow EAP-FAST to peek ahead. * ssl3_check_finished returns 1 if we are resuming from an external * pre-shared secret, we have a "ticket" and the next server handshake message * is Finished; and 0 otherwise. It returns -1 upon an error. */ static int ssl3_check_finished(SSL *s) { int ok = 0; if (s->version < TLS1_VERSION || !s->tls_session_secret_cb || !s->session->tlsext_tick) return 0; /* Need to permit this temporarily, in case the next message is Finished. */ s->s3->flags |= SSL3_FLAGS_CCS_OK; /* * This function is called when we might get a Certificate message instead, * so permit appropriate message length. * We ignore the return value as we're only interested in the message type * and not its length. */ s->method->ssl_get_message(s, SSL3_ST_CR_CERT_A, SSL3_ST_CR_CERT_B, -1, s->max_cert_list, &ok); s->s3->flags &= ~SSL3_FLAGS_CCS_OK; if (!ok) return -1; s->s3->tmp.reuse_message = 1; if (s->s3->tmp.message_type == SSL3_MT_FINISHED) return 1; /* If we're not done, then the CCS arrived early and we should bail. */ if (s->s3->change_cipher_spec) { SSLerr(SSL_F_SSL3_CHECK_FINISHED, SSL_R_CCS_RECEIVED_EARLY); ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); return -1; } return 0; } #ifndef OPENSSL_NO_NEXTPROTONEG int ssl3_send_next_proto(SSL *s) { unsigned int len, padding_len; unsigned char *d; if (s->state == SSL3_ST_CW_NEXT_PROTO_A) { len = s->next_proto_negotiated_len; padding_len = 32 - ((len + 2) % 32); d = (unsigned char *)s->init_buf->data; d[4] = len; memcpy(d + 5, s->next_proto_negotiated, len); d[5 + len] = padding_len; memset(d + 6 + len, 0, padding_len); *(d++) = SSL3_MT_NEXT_PROTO; l2n3(2 + len + padding_len, d); s->state = SSL3_ST_CW_NEXT_PROTO_B; s->init_num = 4 + 2 + len + padding_len; s->init_off = 0; } return ssl3_do_write(s, SSL3_RT_HANDSHAKE); } #endif int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) { int i = 0; #ifndef OPENSSL_NO_ENGINE if (s->ctx->client_cert_engine) { i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s, SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); if (i != 0) return i; } #endif if (s->ctx->client_cert_cb) i = s->ctx->client_cert_cb(s, px509, ppkey); return i; } int ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) *sk, unsigned char *p, int (*put_cb) (const SSL_CIPHER *, unsigned char *)) { int i, j = 0; SSL_CIPHER *c; unsigned char *q; int empty_reneg_info_scsv = !s->renegotiate; /* Set disabled masks for this session */ ssl_set_client_disabled(s); if (sk == NULL) return (0); q = p; if (put_cb == NULL) put_cb = s->method->put_cipher_by_char; for (i = 0; i < sk_SSL_CIPHER_num(sk); i++) { c = sk_SSL_CIPHER_value(sk, i); /* Skip disabled ciphers */ if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_SUPPORTED)) continue; #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL if (c->id == SSL3_CK_SCSV) { if (!empty_reneg_info_scsv) continue; else empty_reneg_info_scsv = 0; } #endif j = put_cb(c, p); p += j; } /* * If p == q, no ciphers; caller indicates an error. Otherwise, add * applicable SCSVs. */ if (p != q) { if (empty_reneg_info_scsv) { static SSL_CIPHER scsv = { 0, NULL, SSL3_CK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; j = put_cb(&scsv, p); p += j; #ifdef OPENSSL_RI_DEBUG fprintf(stderr, "TLS_EMPTY_RENEGOTIATION_INFO_SCSV sent by client\n"); #endif } if (s->mode & SSL_MODE_SEND_FALLBACK_SCSV) { static SSL_CIPHER scsv = { 0, NULL, SSL3_CK_FALLBACK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; j = put_cb(&scsv, p); p += j; } } return (p - q); }