Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| 2 | * All rights reserved. |
| 3 | * |
| 4 | * This package is an SSL implementation written |
| 5 | * by Eric Young (eay@cryptsoft.com). |
| 6 | * The implementation was written so as to conform with Netscapes SSL. |
| 7 | * |
| 8 | * This library is free for commercial and non-commercial use as long as |
| 9 | * the following conditions are aheared to. The following conditions |
| 10 | * apply to all code found in this distribution, be it the RC4, RSA, |
| 11 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
| 12 | * included with this distribution is covered by the same copyright terms |
| 13 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
| 14 | * |
| 15 | * Copyright remains Eric Young's, and as such any Copyright notices in |
| 16 | * the code are not to be removed. |
| 17 | * If this package is used in a product, Eric Young should be given attribution |
| 18 | * as the author of the parts of the library used. |
| 19 | * This can be in the form of a textual message at program startup or |
| 20 | * in documentation (online or textual) provided with the package. |
| 21 | * |
| 22 | * Redistribution and use in source and binary forms, with or without |
| 23 | * modification, are permitted provided that the following conditions |
| 24 | * are met: |
| 25 | * 1. Redistributions of source code must retain the copyright |
| 26 | * notice, this list of conditions and the following disclaimer. |
| 27 | * 2. Redistributions in binary form must reproduce the above copyright |
| 28 | * notice, this list of conditions and the following disclaimer in the |
| 29 | * documentation and/or other materials provided with the distribution. |
| 30 | * 3. All advertising materials mentioning features or use of this software |
| 31 | * must display the following acknowledgement: |
| 32 | * "This product includes cryptographic software written by |
| 33 | * Eric Young (eay@cryptsoft.com)" |
| 34 | * The word 'cryptographic' can be left out if the rouines from the library |
| 35 | * being used are not cryptographic related :-). |
| 36 | * 4. If you include any Windows specific code (or a derivative thereof) from |
| 37 | * the apps directory (application code) you must include an acknowledgement: |
| 38 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
| 39 | * |
| 40 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
| 41 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 43 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 44 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 45 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 46 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 48 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 49 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 50 | * SUCH DAMAGE. |
| 51 | * |
| 52 | * The licence and distribution terms for any publically available version or |
| 53 | * derivative of this code cannot be changed. i.e. this code cannot simply be |
| 54 | * copied and put under another distribution licence |
| 55 | * [including the GNU Public Licence.] |
| 56 | */ |
| 57 | /* ==================================================================== |
| 58 | * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. |
| 59 | * |
| 60 | * Redistribution and use in source and binary forms, with or without |
| 61 | * modification, are permitted provided that the following conditions |
| 62 | * are met: |
| 63 | * |
| 64 | * 1. Redistributions of source code must retain the above copyright |
| 65 | * notice, this list of conditions and the following disclaimer. |
| 66 | * |
| 67 | * 2. Redistributions in binary form must reproduce the above copyright |
| 68 | * notice, this list of conditions and the following disclaimer in |
| 69 | * the documentation and/or other materials provided with the |
| 70 | * distribution. |
| 71 | * |
| 72 | * 3. All advertising materials mentioning features or use of this |
| 73 | * software must display the following acknowledgment: |
| 74 | * "This product includes software developed by the OpenSSL Project |
| 75 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" |
| 76 | * |
| 77 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| 78 | * endorse or promote products derived from this software without |
| 79 | * prior written permission. For written permission, please contact |
| 80 | * openssl-core@openssl.org. |
| 81 | * |
| 82 | * 5. Products derived from this software may not be called "OpenSSL" |
| 83 | * nor may "OpenSSL" appear in their names without prior written |
| 84 | * permission of the OpenSSL Project. |
| 85 | * |
| 86 | * 6. Redistributions of any form whatsoever must retain the following |
| 87 | * acknowledgment: |
| 88 | * "This product includes software developed by the OpenSSL Project |
| 89 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" |
| 90 | * |
| 91 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
| 92 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 93 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 94 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
| 95 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 96 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 97 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 98 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 99 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 100 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 101 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 102 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
| 103 | * ==================================================================== |
| 104 | * |
| 105 | * This product includes cryptographic software written by Eric Young |
| 106 | * (eay@cryptsoft.com). This product includes software written by Tim |
| 107 | * Hudson (tjh@cryptsoft.com). |
| 108 | * |
| 109 | */ |
| 110 | /* ==================================================================== |
| 111 | * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. |
| 112 | * |
| 113 | * Portions of the attached software ("Contribution") are developed by |
| 114 | * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. |
| 115 | * |
| 116 | * The Contribution is licensed pursuant to the OpenSSL open source |
| 117 | * license provided above. |
| 118 | * |
| 119 | * ECC cipher suite support in OpenSSL originally written by |
| 120 | * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories. |
| 121 | * |
| 122 | */ |
| 123 | /* ==================================================================== |
| 124 | * Copyright 2005 Nokia. All rights reserved. |
| 125 | * |
| 126 | * The portions of the attached software ("Contribution") is developed by |
| 127 | * Nokia Corporation and is licensed pursuant to the OpenSSL open source |
| 128 | * license. |
| 129 | * |
| 130 | * The Contribution, originally written by Mika Kousa and Pasi Eronen of |
| 131 | * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites |
| 132 | * support (see RFC 4279) to OpenSSL. |
| 133 | * |
| 134 | * No patent licenses or other rights except those expressly stated in |
| 135 | * the OpenSSL open source license shall be deemed granted or received |
| 136 | * expressly, by implication, estoppel, or otherwise. |
| 137 | * |
| 138 | * No assurances are provided by Nokia that the Contribution does not |
| 139 | * infringe the patent or other intellectual property rights of any third |
| 140 | * party or that the license provides you with all the necessary rights |
| 141 | * to make use of the Contribution. |
| 142 | * |
| 143 | * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN |
| 144 | * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA |
| 145 | * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY |
| 146 | * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR |
| 147 | * OTHERWISE. */ |
| 148 | |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 149 | #include <openssl/ssl.h> |
| 150 | |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 151 | #include <assert.h> |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 152 | #include <string.h> |
| 153 | |
| 154 | #include <openssl/bn.h> |
| 155 | #include <openssl/buf.h> |
| 156 | #include <openssl/bytestring.h> |
| 157 | #include <openssl/cipher.h> |
| 158 | #include <openssl/dh.h> |
| 159 | #include <openssl/ec.h> |
| 160 | #include <openssl/ecdsa.h> |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 161 | #include <openssl/err.h> |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 162 | #include <openssl/evp.h> |
| 163 | #include <openssl/hmac.h> |
| 164 | #include <openssl/md5.h> |
| 165 | #include <openssl/mem.h> |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 166 | #include <openssl/nid.h> |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 167 | #include <openssl/rand.h> |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 168 | #include <openssl/x509.h> |
| 169 | |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 170 | #include "internal.h" |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 171 | #include "../crypto/internal.h" |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 172 | |
| 173 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 174 | static int ssl3_get_client_hello(SSL_HANDSHAKE *hs); |
| 175 | static int ssl3_send_server_hello(SSL_HANDSHAKE *hs); |
| 176 | static int ssl3_send_server_certificate(SSL_HANDSHAKE *hs); |
| 177 | static int ssl3_send_certificate_status(SSL_HANDSHAKE *hs); |
| 178 | static int ssl3_send_server_key_exchange(SSL_HANDSHAKE *hs); |
| 179 | static int ssl3_send_certificate_request(SSL_HANDSHAKE *hs); |
| 180 | static int ssl3_send_server_hello_done(SSL_HANDSHAKE *hs); |
| 181 | static int ssl3_get_client_certificate(SSL_HANDSHAKE *hs); |
| 182 | static int ssl3_get_client_key_exchange(SSL_HANDSHAKE *hs); |
| 183 | static int ssl3_get_cert_verify(SSL_HANDSHAKE *hs); |
| 184 | static int ssl3_get_next_proto(SSL_HANDSHAKE *hs); |
| 185 | static int ssl3_get_channel_id(SSL_HANDSHAKE *hs); |
| 186 | static int ssl3_send_new_session_ticket(SSL_HANDSHAKE *hs); |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 187 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 188 | int ssl3_accept(SSL_HANDSHAKE *hs) { |
| 189 | SSL *const ssl = hs->ssl; |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 190 | uint32_t alg_a; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 191 | int ret = -1; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 192 | int state, skip = 0; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 193 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 194 | assert(ssl->handshake_func == ssl3_accept); |
| 195 | assert(ssl->server); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 196 | |
| 197 | for (;;) { |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 198 | state = hs->state; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 199 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 200 | switch (hs->state) { |
David Benjamin | 7c0d06c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 201 | case SSL_ST_INIT: |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 202 | hs->state = SSL_ST_ACCEPT; |
David Benjamin | 7c0d06c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 203 | skip = 1; |
| 204 | break; |
| 205 | |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 206 | case SSL_ST_ACCEPT: |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 207 | ssl_do_info_callback(ssl, SSL_CB_HANDSHAKE_START, 1); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 208 | |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 209 | /* Enable a write buffer. This groups handshake messages within a flight |
| 210 | * into a single write. */ |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 211 | if (!ssl_init_wbio_buffer(ssl)) { |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 212 | ret = -1; |
| 213 | goto end; |
| 214 | } |
| 215 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 216 | if (!ssl3_init_handshake_buffer(ssl)) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 217 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 218 | ret = -1; |
| 219 | goto end; |
| 220 | } |
| 221 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 222 | hs->state = SSL3_ST_SR_CLNT_HELLO_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 223 | break; |
| 224 | |
| 225 | case SSL3_ST_SR_CLNT_HELLO_A: |
| 226 | case SSL3_ST_SR_CLNT_HELLO_B: |
| 227 | case SSL3_ST_SR_CLNT_HELLO_C: |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 228 | case SSL3_ST_SR_CLNT_HELLO_D: |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 229 | case SSL3_ST_SR_CLNT_HELLO_E: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 230 | ret = ssl3_get_client_hello(hs); |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 231 | if (hs->state == SSL_ST_TLS13) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 232 | break; |
| 233 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 234 | if (ret <= 0) { |
| 235 | goto end; |
| 236 | } |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 237 | ssl->method->received_flight(ssl); |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 238 | hs->state = SSL3_ST_SW_SRVR_HELLO_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 239 | break; |
| 240 | |
| 241 | case SSL3_ST_SW_SRVR_HELLO_A: |
| 242 | case SSL3_ST_SW_SRVR_HELLO_B: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 243 | ret = ssl3_send_server_hello(hs); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 244 | if (ret <= 0) { |
| 245 | goto end; |
| 246 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 247 | if (ssl->session != NULL) { |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 248 | hs->state = SSL3_ST_SW_SESSION_TICKET_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 249 | } else { |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 250 | hs->state = SSL3_ST_SW_CERT_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 251 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 252 | break; |
| 253 | |
| 254 | case SSL3_ST_SW_CERT_A: |
| 255 | case SSL3_ST_SW_CERT_B: |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 256 | if (ssl_cipher_uses_certificate_auth(ssl->s3->tmp.new_cipher)) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 257 | ret = ssl3_send_server_certificate(hs); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 258 | if (ret <= 0) { |
| 259 | goto end; |
| 260 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 261 | } else { |
| 262 | skip = 1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 263 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 264 | hs->state = SSL3_ST_SW_CERT_STATUS_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 265 | break; |
| 266 | |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 267 | case SSL3_ST_SW_CERT_STATUS_A: |
| 268 | case SSL3_ST_SW_CERT_STATUS_B: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 269 | if (hs->certificate_status_expected) { |
| 270 | ret = ssl3_send_certificate_status(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 271 | if (ret <= 0) { |
| 272 | goto end; |
| 273 | } |
| 274 | } else { |
| 275 | skip = 1; |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 276 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 277 | hs->state = SSL3_ST_SW_KEY_EXCH_A; |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 278 | break; |
| 279 | |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 280 | case SSL3_ST_SW_KEY_EXCH_A: |
| 281 | case SSL3_ST_SW_KEY_EXCH_B: |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 282 | case SSL3_ST_SW_KEY_EXCH_C: |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 283 | alg_a = ssl->s3->tmp.new_cipher->algorithm_auth; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 284 | |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 285 | /* PSK ciphers send ServerKeyExchange if there is an identity hint. */ |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 286 | if (ssl_cipher_requires_server_key_exchange(ssl->s3->tmp.new_cipher) || |
| 287 | ((alg_a & SSL_aPSK) && ssl->psk_identity_hint)) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 288 | ret = ssl3_send_server_key_exchange(hs); |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 289 | if (ret <= 0) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 290 | goto end; |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 291 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 292 | } else { |
| 293 | skip = 1; |
| 294 | } |
| 295 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 296 | hs->state = SSL3_ST_SW_CERT_REQ_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 297 | break; |
| 298 | |
| 299 | case SSL3_ST_SW_CERT_REQ_A: |
| 300 | case SSL3_ST_SW_CERT_REQ_B: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 301 | if (hs->cert_request) { |
| 302 | ret = ssl3_send_certificate_request(hs); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 303 | if (ret <= 0) { |
| 304 | goto end; |
| 305 | } |
Adam Langley | f4e4272 | 2015-06-04 17:45:09 -0700 | [diff] [blame] | 306 | } else { |
| 307 | skip = 1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 308 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 309 | hs->state = SSL3_ST_SW_SRVR_DONE_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 310 | break; |
| 311 | |
| 312 | case SSL3_ST_SW_SRVR_DONE_A: |
| 313 | case SSL3_ST_SW_SRVR_DONE_B: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 314 | ret = ssl3_send_server_hello_done(hs); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 315 | if (ret <= 0) { |
| 316 | goto end; |
| 317 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 318 | hs->next_state = SSL3_ST_SR_CERT_A; |
| 319 | hs->state = SSL3_ST_SW_FLUSH; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 320 | break; |
| 321 | |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 322 | case SSL3_ST_SR_CERT_A: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 323 | if (hs->cert_request) { |
| 324 | ret = ssl3_get_client_certificate(hs); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 325 | if (ret <= 0) { |
| 326 | goto end; |
| 327 | } |
| 328 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 329 | hs->state = SSL3_ST_SR_KEY_EXCH_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 330 | break; |
| 331 | |
| 332 | case SSL3_ST_SR_KEY_EXCH_A: |
| 333 | case SSL3_ST_SR_KEY_EXCH_B: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 334 | ret = ssl3_get_client_key_exchange(hs); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 335 | if (ret <= 0) { |
| 336 | goto end; |
| 337 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 338 | hs->state = SSL3_ST_SR_CERT_VRFY_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 339 | break; |
| 340 | |
| 341 | case SSL3_ST_SR_CERT_VRFY_A: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 342 | ret = ssl3_get_cert_verify(hs); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 343 | if (ret <= 0) { |
| 344 | goto end; |
| 345 | } |
| 346 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 347 | hs->state = SSL3_ST_SR_CHANGE; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 348 | break; |
| 349 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 350 | case SSL3_ST_SR_CHANGE: |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 351 | ret = ssl->method->read_change_cipher_spec(ssl); |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 352 | if (ret <= 0) { |
| 353 | goto end; |
| 354 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 355 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 356 | if (!tls1_change_cipher_state(hs, SSL3_CHANGE_CIPHER_SERVER_READ)) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 357 | ret = -1; |
| 358 | goto end; |
| 359 | } |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 360 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 361 | hs->state = SSL3_ST_SR_NEXT_PROTO_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 362 | break; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 363 | |
| 364 | case SSL3_ST_SR_NEXT_PROTO_A: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 365 | if (hs->next_proto_neg_seen) { |
| 366 | ret = ssl3_get_next_proto(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 367 | if (ret <= 0) { |
| 368 | goto end; |
| 369 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 370 | } else { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 371 | skip = 1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 372 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 373 | hs->state = SSL3_ST_SR_CHANNEL_ID_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 374 | break; |
| 375 | |
| 376 | case SSL3_ST_SR_CHANNEL_ID_A: |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 377 | if (ssl->s3->tlsext_channel_id_valid) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 378 | ret = ssl3_get_channel_id(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 379 | if (ret <= 0) { |
| 380 | goto end; |
| 381 | } |
| 382 | } else { |
| 383 | skip = 1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 384 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 385 | hs->state = SSL3_ST_SR_FINISHED_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 386 | break; |
| 387 | |
| 388 | case SSL3_ST_SR_FINISHED_A: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 389 | ret = ssl3_get_finished(hs); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 390 | if (ret <= 0) { |
| 391 | goto end; |
| 392 | } |
| 393 | |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 394 | ssl->method->received_flight(ssl); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 395 | if (ssl->session != NULL) { |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 396 | hs->state = SSL_ST_OK; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 397 | } else { |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 398 | hs->state = SSL3_ST_SW_SESSION_TICKET_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 399 | } |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 400 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 401 | /* If this is a full handshake with ChannelID then record the handshake |
| 402 | * hashes in |ssl->s3->new_session| in case we need them to verify a |
| 403 | * ChannelID signature on a resumption of this session in the future. */ |
| 404 | if (ssl->session == NULL && ssl->s3->tlsext_channel_id_valid) { |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 405 | ret = tls1_record_handshake_hashes_for_channel_id(ssl); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 406 | if (ret <= 0) { |
| 407 | goto end; |
| 408 | } |
| 409 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 410 | break; |
| 411 | |
| 412 | case SSL3_ST_SW_SESSION_TICKET_A: |
| 413 | case SSL3_ST_SW_SESSION_TICKET_B: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 414 | if (hs->ticket_expected) { |
| 415 | ret = ssl3_send_new_session_ticket(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 416 | if (ret <= 0) { |
| 417 | goto end; |
| 418 | } |
| 419 | } else { |
| 420 | skip = 1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 421 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 422 | hs->state = SSL3_ST_SW_CHANGE; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 423 | break; |
| 424 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 425 | case SSL3_ST_SW_CHANGE: |
| 426 | ret = ssl->method->send_change_cipher_spec(ssl); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 427 | if (ret <= 0) { |
| 428 | goto end; |
| 429 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 430 | hs->state = SSL3_ST_SW_FINISHED_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 431 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 432 | if (!tls1_change_cipher_state(hs, SSL3_CHANGE_CIPHER_SERVER_WRITE)) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 433 | ret = -1; |
| 434 | goto end; |
| 435 | } |
| 436 | break; |
| 437 | |
| 438 | case SSL3_ST_SW_FINISHED_A: |
| 439 | case SSL3_ST_SW_FINISHED_B: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 440 | ret = ssl3_send_finished(hs, SSL3_ST_SW_FINISHED_A, |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 441 | SSL3_ST_SW_FINISHED_B); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 442 | if (ret <= 0) { |
| 443 | goto end; |
| 444 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 445 | hs->state = SSL3_ST_SW_FLUSH; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 446 | if (ssl->session != NULL) { |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 447 | hs->next_state = SSL3_ST_SR_CHANGE; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 448 | } else { |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 449 | hs->next_state = SSL_ST_OK; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 450 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 451 | break; |
| 452 | |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 453 | case SSL3_ST_SW_FLUSH: |
David Benjamin | f31229b | 2017-01-25 14:08:15 -0500 | [diff] [blame^] | 454 | ret = ssl->method->flush_flight(ssl); |
| 455 | if (ret <= 0) { |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 456 | goto end; |
| 457 | } |
| 458 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 459 | hs->state = hs->next_state; |
| 460 | if (hs->state != SSL_ST_OK) { |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 461 | ssl->method->expect_flight(ssl); |
| 462 | } |
| 463 | break; |
| 464 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 465 | case SSL_ST_TLS13: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 466 | ret = tls13_handshake(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 467 | if (ret <= 0) { |
| 468 | goto end; |
| 469 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 470 | hs->state = SSL_ST_OK; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 471 | break; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 472 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 473 | case SSL_ST_OK: |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 474 | ssl->method->release_current_message(ssl, 1 /* free_buffer */); |
| 475 | |
| 476 | /* If we aren't retaining peer certificates then we can discard it |
| 477 | * now. */ |
| 478 | if (ssl->s3->new_session != NULL && |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 479 | ssl->retain_only_sha256_of_client_certs) { |
| 480 | X509_free(ssl->s3->new_session->x509_peer); |
| 481 | ssl->s3->new_session->x509_peer = NULL; |
| 482 | sk_X509_pop_free(ssl->s3->new_session->x509_chain, X509_free); |
| 483 | ssl->s3->new_session->x509_chain = NULL; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 484 | } |
| 485 | |
| 486 | SSL_SESSION_free(ssl->s3->established_session); |
| 487 | if (ssl->session != NULL) { |
| 488 | SSL_SESSION_up_ref(ssl->session); |
| 489 | ssl->s3->established_session = ssl->session; |
| 490 | } else { |
| 491 | ssl->s3->established_session = ssl->s3->new_session; |
| 492 | ssl->s3->established_session->not_resumable = 0; |
| 493 | ssl->s3->new_session = NULL; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 494 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 495 | |
| 496 | /* remove buffering on output */ |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 497 | ssl_free_wbio_buffer(ssl); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 498 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 499 | ssl->s3->initial_handshake_complete = 1; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 500 | ssl_update_cache(hs, SSL_SESS_CACHE_SERVER); |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 501 | |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 502 | ssl_do_info_callback(ssl, SSL_CB_HANDSHAKE_DONE, 1); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 503 | ret = 1; |
| 504 | goto end; |
| 505 | |
| 506 | default: |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 507 | OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_STATE); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 508 | ret = -1; |
| 509 | goto end; |
| 510 | } |
| 511 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 512 | if (!ssl->s3->tmp.reuse_message && !skip && hs->state != state) { |
| 513 | int new_state = hs->state; |
| 514 | hs->state = state; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 515 | ssl_do_info_callback(ssl, SSL_CB_ACCEPT_LOOP, 1); |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 516 | hs->state = new_state; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 517 | } |
| 518 | skip = 0; |
| 519 | } |
| 520 | |
| 521 | end: |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 522 | ssl_do_info_callback(ssl, SSL_CB_ACCEPT_EXIT, ret); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 523 | return ret; |
| 524 | } |
| 525 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 526 | int ssl_client_cipher_list_contains_cipher(const SSL_CLIENT_HELLO *client_hello, |
| 527 | uint16_t id) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 528 | CBS cipher_suites; |
| 529 | CBS_init(&cipher_suites, client_hello->cipher_suites, |
| 530 | client_hello->cipher_suites_len); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 531 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 532 | while (CBS_len(&cipher_suites) > 0) { |
| 533 | uint16_t got_id; |
| 534 | if (!CBS_get_u16(&cipher_suites, &got_id)) { |
| 535 | return 0; |
| 536 | } |
| 537 | |
| 538 | if (got_id == id) { |
| 539 | return 1; |
| 540 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 541 | } |
| 542 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 543 | return 0; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 544 | } |
| 545 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 546 | static int negotiate_version(SSL_HANDSHAKE *hs, uint8_t *out_alert, |
| 547 | const SSL_CLIENT_HELLO *client_hello) { |
| 548 | SSL *const ssl = hs->ssl; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 549 | uint16_t min_version, max_version; |
| 550 | if (!ssl_get_version_range(ssl, &min_version, &max_version)) { |
| 551 | *out_alert = SSL_AD_PROTOCOL_VERSION; |
| 552 | return 0; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 553 | } |
| 554 | |
David Benjamin | 7c0d06c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 555 | uint16_t version = 0; |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 556 | /* Check supported_versions extension if it is present. */ |
| 557 | CBS supported_versions; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 558 | if (ssl_client_hello_get_extension(client_hello, &supported_versions, |
| 559 | TLSEXT_TYPE_supported_versions)) { |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 560 | CBS versions; |
| 561 | if (!CBS_get_u8_length_prefixed(&supported_versions, &versions) || |
| 562 | CBS_len(&supported_versions) != 0 || |
| 563 | CBS_len(&versions) == 0) { |
| 564 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 565 | *out_alert = SSL_AD_DECODE_ERROR; |
| 566 | return 0; |
| 567 | } |
| 568 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 569 | /* Choose the newest commonly-supported version advertised by the client. |
| 570 | * The client orders the versions according to its preferences, but we're |
| 571 | * not required to honor the client's preferences. */ |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 572 | int found_version = 0; |
| 573 | while (CBS_len(&versions) != 0) { |
| 574 | uint16_t ext_version; |
| 575 | if (!CBS_get_u16(&versions, &ext_version)) { |
| 576 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 577 | *out_alert = SSL_AD_DECODE_ERROR; |
| 578 | return 0; |
| 579 | } |
| 580 | if (!ssl->method->version_from_wire(&ext_version, ext_version)) { |
| 581 | continue; |
| 582 | } |
| 583 | if (min_version <= ext_version && |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 584 | ext_version <= max_version && |
| 585 | (!found_version || version < ext_version)) { |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 586 | version = ext_version; |
| 587 | found_version = 1; |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 588 | } |
| 589 | } |
| 590 | |
| 591 | if (!found_version) { |
| 592 | goto unsupported_protocol; |
David Benjamin | 7c0d06c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 593 | } |
| 594 | } else { |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 595 | /* Process ClientHello.version instead. Note that versions beyond (D)TLS 1.2 |
| 596 | * do not use this mechanism. */ |
| 597 | if (SSL_is_dtls(ssl)) { |
| 598 | if (client_hello->version <= DTLS1_2_VERSION) { |
| 599 | version = TLS1_2_VERSION; |
| 600 | } else if (client_hello->version <= DTLS1_VERSION) { |
| 601 | version = TLS1_1_VERSION; |
| 602 | } else { |
| 603 | goto unsupported_protocol; |
| 604 | } |
| 605 | } else { |
| 606 | if (client_hello->version >= TLS1_2_VERSION) { |
| 607 | version = TLS1_2_VERSION; |
| 608 | } else if (client_hello->version >= TLS1_1_VERSION) { |
| 609 | version = TLS1_1_VERSION; |
| 610 | } else if (client_hello->version >= TLS1_VERSION) { |
| 611 | version = TLS1_VERSION; |
| 612 | } else if (client_hello->version >= SSL3_VERSION) { |
| 613 | version = SSL3_VERSION; |
| 614 | } else { |
| 615 | goto unsupported_protocol; |
| 616 | } |
David Benjamin | 7c0d06c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 617 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 618 | |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 619 | /* Apply our minimum and maximum version. */ |
| 620 | if (version > max_version) { |
| 621 | version = max_version; |
| 622 | } |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 623 | |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 624 | if (version < min_version) { |
| 625 | goto unsupported_protocol; |
| 626 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 627 | } |
| 628 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 629 | /* Handle FALLBACK_SCSV. */ |
| 630 | if (ssl_client_cipher_list_contains_cipher(client_hello, |
| 631 | SSL3_CK_FALLBACK_SCSV & 0xffff) && |
| 632 | version < max_version) { |
| 633 | OPENSSL_PUT_ERROR(SSL, SSL_R_INAPPROPRIATE_FALLBACK); |
| 634 | *out_alert = SSL3_AD_INAPPROPRIATE_FALLBACK; |
| 635 | return 0; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 636 | } |
| 637 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 638 | hs->client_version = client_hello->version; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 639 | ssl->version = ssl->method->version_to_wire(version); |
| 640 | ssl->s3->enc_method = ssl3_get_enc_method(version); |
| 641 | assert(ssl->s3->enc_method != NULL); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 642 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 643 | /* At this point, the connection's version is known and |ssl->version| is |
| 644 | * fixed. Begin enforcing the record-layer version. */ |
| 645 | ssl->s3->have_version = 1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 646 | |
| 647 | return 1; |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 648 | |
| 649 | unsupported_protocol: |
| 650 | OPENSSL_PUT_ERROR(SSL, SSL_R_UNSUPPORTED_PROTOCOL); |
| 651 | *out_alert = SSL_AD_PROTOCOL_VERSION; |
| 652 | return 0; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 653 | } |
| 654 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 655 | static STACK_OF(SSL_CIPHER) * |
| 656 | ssl_parse_client_cipher_list(const SSL_CLIENT_HELLO *client_hello) { |
| 657 | CBS cipher_suites; |
| 658 | CBS_init(&cipher_suites, client_hello->cipher_suites, |
| 659 | client_hello->cipher_suites_len); |
| 660 | |
| 661 | STACK_OF(SSL_CIPHER) *sk = sk_SSL_CIPHER_new_null(); |
| 662 | if (sk == NULL) { |
| 663 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
| 664 | goto err; |
| 665 | } |
| 666 | |
| 667 | while (CBS_len(&cipher_suites) > 0) { |
| 668 | uint16_t cipher_suite; |
| 669 | |
| 670 | if (!CBS_get_u16(&cipher_suites, &cipher_suite)) { |
| 671 | OPENSSL_PUT_ERROR(SSL, SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST); |
| 672 | goto err; |
| 673 | } |
| 674 | |
| 675 | const SSL_CIPHER *c = SSL_get_cipher_by_value(cipher_suite); |
| 676 | if (c != NULL && !sk_SSL_CIPHER_push(sk, c)) { |
| 677 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
| 678 | goto err; |
| 679 | } |
| 680 | } |
| 681 | |
| 682 | return sk; |
| 683 | |
| 684 | err: |
| 685 | sk_SSL_CIPHER_free(sk); |
| 686 | return NULL; |
| 687 | } |
| 688 | |
| 689 | /* ssl_get_compatible_server_ciphers determines the key exchange and |
| 690 | * authentication cipher suite masks compatible with the server configuration |
| 691 | * and current ClientHello parameters of |hs|. It sets |*out_mask_k| to the key |
| 692 | * exchange mask and |*out_mask_a| to the authentication mask. */ |
| 693 | static void ssl_get_compatible_server_ciphers(SSL_HANDSHAKE *hs, |
| 694 | uint32_t *out_mask_k, |
| 695 | uint32_t *out_mask_a) { |
| 696 | SSL *const ssl = hs->ssl; |
| 697 | if (ssl3_protocol_version(ssl) >= TLS1_3_VERSION) { |
| 698 | *out_mask_k = SSL_kGENERIC; |
| 699 | *out_mask_a = SSL_aGENERIC; |
| 700 | return; |
| 701 | } |
| 702 | |
| 703 | uint32_t mask_k = 0; |
| 704 | uint32_t mask_a = 0; |
| 705 | |
| 706 | if (ssl->cert->x509_leaf != NULL && ssl_has_private_key(ssl)) { |
| 707 | int type = ssl_private_key_type(ssl); |
| 708 | if (type == NID_rsaEncryption) { |
| 709 | mask_k |= SSL_kRSA; |
| 710 | mask_a |= SSL_aRSA; |
| 711 | } else if (ssl_is_ecdsa_key_type(type)) { |
| 712 | mask_a |= SSL_aECDSA; |
| 713 | } |
| 714 | } |
| 715 | |
| 716 | if (ssl->cert->dh_tmp != NULL || ssl->cert->dh_tmp_cb != NULL) { |
| 717 | mask_k |= SSL_kDHE; |
| 718 | } |
| 719 | |
| 720 | /* Check for a shared group to consider ECDHE ciphers. */ |
| 721 | uint16_t unused; |
| 722 | if (tls1_get_shared_group(hs, &unused)) { |
| 723 | mask_k |= SSL_kECDHE; |
| 724 | } |
| 725 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 726 | /* PSK requires a server callback. */ |
| 727 | if (ssl->psk_server_callback != NULL) { |
| 728 | mask_k |= SSL_kPSK; |
| 729 | mask_a |= SSL_aPSK; |
| 730 | } |
| 731 | |
| 732 | *out_mask_k = mask_k; |
| 733 | *out_mask_a = mask_a; |
| 734 | } |
| 735 | |
| 736 | static const SSL_CIPHER *ssl3_choose_cipher( |
| 737 | SSL_HANDSHAKE *hs, const SSL_CLIENT_HELLO *client_hello, |
| 738 | const struct ssl_cipher_preference_list_st *server_pref) { |
| 739 | SSL *const ssl = hs->ssl; |
| 740 | const SSL_CIPHER *c, *ret = NULL; |
| 741 | STACK_OF(SSL_CIPHER) *srvr = server_pref->ciphers, *prio, *allow; |
| 742 | int ok; |
| 743 | size_t cipher_index; |
| 744 | uint32_t alg_k, alg_a, mask_k, mask_a; |
| 745 | /* in_group_flags will either be NULL, or will point to an array of bytes |
| 746 | * which indicate equal-preference groups in the |prio| stack. See the |
| 747 | * comment about |in_group_flags| in the |ssl_cipher_preference_list_st| |
| 748 | * struct. */ |
| 749 | const uint8_t *in_group_flags; |
| 750 | /* group_min contains the minimal index so far found in a group, or -1 if no |
| 751 | * such value exists yet. */ |
| 752 | int group_min = -1; |
| 753 | |
| 754 | STACK_OF(SSL_CIPHER) *clnt = ssl_parse_client_cipher_list(client_hello); |
| 755 | if (clnt == NULL) { |
| 756 | return NULL; |
| 757 | } |
| 758 | |
| 759 | if (ssl->options & SSL_OP_CIPHER_SERVER_PREFERENCE) { |
| 760 | prio = srvr; |
| 761 | in_group_flags = server_pref->in_group_flags; |
| 762 | allow = clnt; |
| 763 | } else { |
| 764 | prio = clnt; |
| 765 | in_group_flags = NULL; |
| 766 | allow = srvr; |
| 767 | } |
| 768 | |
| 769 | ssl_get_compatible_server_ciphers(hs, &mask_k, &mask_a); |
| 770 | |
| 771 | for (size_t i = 0; i < sk_SSL_CIPHER_num(prio); i++) { |
| 772 | c = sk_SSL_CIPHER_value(prio, i); |
| 773 | |
| 774 | ok = 1; |
| 775 | |
| 776 | /* Check the TLS version. */ |
| 777 | if (SSL_CIPHER_get_min_version(c) > ssl3_protocol_version(ssl) || |
| 778 | SSL_CIPHER_get_max_version(c) < ssl3_protocol_version(ssl)) { |
| 779 | ok = 0; |
| 780 | } |
| 781 | |
| 782 | alg_k = c->algorithm_mkey; |
| 783 | alg_a = c->algorithm_auth; |
| 784 | |
| 785 | ok = ok && (alg_k & mask_k) && (alg_a & mask_a); |
| 786 | |
| 787 | if (ok && sk_SSL_CIPHER_find(allow, &cipher_index, c)) { |
| 788 | if (in_group_flags != NULL && in_group_flags[i] == 1) { |
| 789 | /* This element of |prio| is in a group. Update the minimum index found |
| 790 | * so far and continue looking. */ |
| 791 | if (group_min == -1 || (size_t)group_min > cipher_index) { |
| 792 | group_min = cipher_index; |
| 793 | } |
| 794 | } else { |
| 795 | if (group_min != -1 && (size_t)group_min < cipher_index) { |
| 796 | cipher_index = group_min; |
| 797 | } |
| 798 | ret = sk_SSL_CIPHER_value(allow, cipher_index); |
| 799 | break; |
| 800 | } |
| 801 | } |
| 802 | |
| 803 | if (in_group_flags != NULL && in_group_flags[i] == 0 && group_min != -1) { |
| 804 | /* We are about to leave a group, but we found a match in it, so that's |
| 805 | * our answer. */ |
| 806 | ret = sk_SSL_CIPHER_value(allow, group_min); |
| 807 | break; |
| 808 | } |
| 809 | } |
| 810 | |
| 811 | sk_SSL_CIPHER_free(clnt); |
| 812 | return ret; |
| 813 | } |
| 814 | |
| 815 | static int ssl3_get_client_hello(SSL_HANDSHAKE *hs) { |
| 816 | SSL *const ssl = hs->ssl; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 817 | uint8_t al = SSL_AD_INTERNAL_ERROR; |
| 818 | int ret = -1; |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 819 | SSL_SESSION *session = NULL; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 820 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 821 | if (hs->state == SSL3_ST_SR_CLNT_HELLO_A) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 822 | /* The first time around, read the ClientHello. */ |
| 823 | int msg_ret = ssl->method->ssl_get_message(ssl, SSL3_MT_CLIENT_HELLO, |
| 824 | ssl_hash_message); |
| 825 | if (msg_ret <= 0) { |
| 826 | return msg_ret; |
| 827 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 828 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 829 | hs->state = SSL3_ST_SR_CLNT_HELLO_B; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 830 | } |
| 831 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 832 | SSL_CLIENT_HELLO client_hello; |
| 833 | if (!ssl_client_hello_init(ssl, &client_hello, ssl->init_msg, |
| 834 | ssl->init_num)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 835 | al = SSL_AD_DECODE_ERROR; |
| 836 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 837 | goto f_err; |
| 838 | } |
| 839 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 840 | if (hs->state == SSL3_ST_SR_CLNT_HELLO_B) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 841 | /* Run the early callback. */ |
| 842 | if (ssl->ctx->select_certificate_cb != NULL) { |
| 843 | switch (ssl->ctx->select_certificate_cb(&client_hello)) { |
| 844 | case 0: |
| 845 | ssl->rwstate = SSL_CERTIFICATE_SELECTION_PENDING; |
| 846 | goto err; |
| 847 | |
| 848 | case -1: |
| 849 | /* Connection rejected. */ |
David Benjamin | 7c0d06c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 850 | al = SSL_AD_HANDSHAKE_FAILURE; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 851 | OPENSSL_PUT_ERROR(SSL, SSL_R_CONNECTION_REJECTED); |
| 852 | goto f_err; |
| 853 | |
| 854 | default: |
| 855 | /* fallthrough */; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 856 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 857 | } |
David Benjamin | f31229b | 2017-01-25 14:08:15 -0500 | [diff] [blame^] | 858 | hs->state = SSL3_ST_SR_CLNT_HELLO_C; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 859 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 860 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 861 | /* Negotiate the protocol version if we have not done so yet. */ |
| 862 | if (!ssl->s3->have_version) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 863 | if (!negotiate_version(hs, &al, &client_hello)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 864 | goto f_err; |
| 865 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 866 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 867 | if (ssl3_protocol_version(ssl) >= TLS1_3_VERSION) { |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 868 | hs->state = SSL_ST_TLS13; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 869 | hs->do_tls13_handshake = tls13_server_handshake; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 870 | return 1; |
| 871 | } |
| 872 | } |
| 873 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 874 | if (hs->state == SSL3_ST_SR_CLNT_HELLO_C) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 875 | /* Load the client random. */ |
| 876 | if (client_hello.random_len != SSL3_RANDOM_SIZE) { |
| 877 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| 878 | return -1; |
| 879 | } |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 880 | OPENSSL_memcpy(ssl->s3->client_random, client_hello.random, |
| 881 | client_hello.random_len); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 882 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 883 | /* Only null compression is supported. */ |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 884 | if (OPENSSL_memchr(client_hello.compression_methods, 0, |
| 885 | client_hello.compression_methods_len) == NULL) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 886 | al = SSL_AD_ILLEGAL_PARAMETER; |
| 887 | OPENSSL_PUT_ERROR(SSL, SSL_R_NO_COMPRESSION_SPECIFIED); |
| 888 | goto f_err; |
| 889 | } |
| 890 | |
| 891 | /* TLS extensions. */ |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 892 | if (!ssl_parse_clienthello_tlsext(hs, &client_hello)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 893 | OPENSSL_PUT_ERROR(SSL, SSL_R_PARSE_TLSEXT); |
| 894 | goto err; |
| 895 | } |
| 896 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 897 | hs->state = SSL3_ST_SR_CLNT_HELLO_D; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 898 | } |
| 899 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 900 | if (hs->state == SSL3_ST_SR_CLNT_HELLO_D) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 901 | /* Call |cert_cb| to update server certificates if required. */ |
| 902 | if (ssl->cert->cert_cb != NULL) { |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 903 | int rv = ssl->cert->cert_cb(ssl, ssl->cert->cert_cb_arg); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 904 | if (rv == 0) { |
| 905 | al = SSL_AD_INTERNAL_ERROR; |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 906 | OPENSSL_PUT_ERROR(SSL, SSL_R_CERT_CB_ERROR); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 907 | goto f_err; |
| 908 | } |
| 909 | if (rv < 0) { |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 910 | ssl->rwstate = SSL_X509_LOOKUP; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 911 | goto err; |
| 912 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 913 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 914 | |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 915 | if (!ssl_auto_chain_if_needed(ssl)) { |
| 916 | goto err; |
| 917 | } |
| 918 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 919 | /* Negotiate the cipher suite. This must be done after |cert_cb| so the |
| 920 | * certificate is finalized. */ |
| 921 | ssl->s3->tmp.new_cipher = |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 922 | ssl3_choose_cipher(hs, &client_hello, ssl_get_cipher_preferences(ssl)); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 923 | if (ssl->s3->tmp.new_cipher == NULL) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 924 | al = SSL_AD_HANDSHAKE_FAILURE; |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 925 | OPENSSL_PUT_ERROR(SSL, SSL_R_NO_SHARED_CIPHER); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 926 | goto f_err; |
| 927 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 928 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 929 | hs->state = SSL3_ST_SR_CLNT_HELLO_E; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 930 | } |
| 931 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 932 | assert(hs->state == SSL3_ST_SR_CLNT_HELLO_E); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 933 | |
| 934 | /* Determine whether we are doing session resumption. */ |
| 935 | int tickets_supported = 0, renew_ticket = 0; |
| 936 | switch (ssl_get_prev_session(ssl, &session, &tickets_supported, &renew_ticket, |
| 937 | &client_hello)) { |
| 938 | case ssl_session_success: |
| 939 | break; |
| 940 | case ssl_session_error: |
| 941 | goto err; |
| 942 | case ssl_session_retry: |
| 943 | ssl->rwstate = SSL_PENDING_SESSION; |
| 944 | goto err; |
| 945 | } |
| 946 | |
| 947 | if (session != NULL) { |
| 948 | if (session->extended_master_secret && |
| 949 | !ssl->s3->tmp.extended_master_secret) { |
| 950 | /* A ClientHello without EMS that attempts to resume a session with EMS |
| 951 | * is fatal to the connection. */ |
| 952 | al = SSL_AD_HANDSHAKE_FAILURE; |
| 953 | OPENSSL_PUT_ERROR(SSL, SSL_R_RESUMED_EMS_SESSION_WITHOUT_EMS_EXTENSION); |
| 954 | goto f_err; |
| 955 | } |
| 956 | |
| 957 | if (!ssl_session_is_resumable(ssl, session) || |
| 958 | /* If the client offers the EMS extension, but the previous session |
| 959 | * didn't use it, then negotiate a new session. */ |
| 960 | ssl->s3->tmp.extended_master_secret != |
| 961 | session->extended_master_secret) { |
| 962 | SSL_SESSION_free(session); |
| 963 | session = NULL; |
| 964 | } |
| 965 | } |
| 966 | |
| 967 | if (session != NULL) { |
| 968 | /* Use the old session. */ |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 969 | hs->ticket_expected = renew_ticket; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 970 | ssl->session = session; |
| 971 | session = NULL; |
| 972 | ssl->s3->session_reused = 1; |
| 973 | } else { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 974 | hs->ticket_expected = tickets_supported; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 975 | ssl_set_session(ssl, NULL); |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 976 | if (!ssl_get_new_session(hs, 1 /* server */)) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 977 | goto err; |
| 978 | } |
| 979 | |
| 980 | /* Clear the session ID if we want the session to be single-use. */ |
| 981 | if (!(ssl->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)) { |
| 982 | ssl->s3->new_session->session_id_length = 0; |
| 983 | } |
| 984 | } |
| 985 | |
| 986 | if (ssl->ctx->dos_protection_cb != NULL && |
| 987 | ssl->ctx->dos_protection_cb(&client_hello) == 0) { |
| 988 | /* Connection rejected for DOS reasons. */ |
| 989 | al = SSL_AD_INTERNAL_ERROR; |
| 990 | OPENSSL_PUT_ERROR(SSL, SSL_R_CONNECTION_REJECTED); |
| 991 | goto f_err; |
| 992 | } |
| 993 | |
| 994 | if (ssl->session == NULL) { |
| 995 | ssl->s3->new_session->cipher = ssl->s3->tmp.new_cipher; |
| 996 | |
| 997 | /* On new sessions, stash the SNI value in the session. */ |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 998 | if (hs->hostname != NULL) { |
| 999 | ssl->s3->new_session->tlsext_hostname = BUF_strdup(hs->hostname); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 1000 | if (ssl->s3->new_session->tlsext_hostname == NULL) { |
| 1001 | al = SSL_AD_INTERNAL_ERROR; |
| 1002 | goto f_err; |
| 1003 | } |
| 1004 | } |
Adam Langley | f4e4272 | 2015-06-04 17:45:09 -0700 | [diff] [blame] | 1005 | |
| 1006 | /* Determine whether to request a client certificate. */ |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1007 | hs->cert_request = !!(ssl->verify_mode & SSL_VERIFY_PEER); |
Adam Langley | f4e4272 | 2015-06-04 17:45:09 -0700 | [diff] [blame] | 1008 | /* Only request a certificate if Channel ID isn't negotiated. */ |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1009 | if ((ssl->verify_mode & SSL_VERIFY_PEER_IF_NO_OBC) && |
| 1010 | ssl->s3->tlsext_channel_id_valid) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1011 | hs->cert_request = 0; |
Adam Langley | f4e4272 | 2015-06-04 17:45:09 -0700 | [diff] [blame] | 1012 | } |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 1013 | /* CertificateRequest may only be sent in certificate-based ciphers. */ |
| 1014 | if (!ssl_cipher_uses_certificate_auth(ssl->s3->tmp.new_cipher)) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1015 | hs->cert_request = 0; |
Adam Langley | f4e4272 | 2015-06-04 17:45:09 -0700 | [diff] [blame] | 1016 | } |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1017 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1018 | if (!hs->cert_request) { |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1019 | /* OpenSSL returns X509_V_OK when no certificates are requested. This is |
| 1020 | * classed by them as a bug, but it's assumed by at least NGINX. */ |
| 1021 | ssl->s3->new_session->verify_result = X509_V_OK; |
| 1022 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1023 | } |
| 1024 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 1025 | /* HTTP/2 negotiation depends on the cipher suite, so ALPN negotiation was |
| 1026 | * deferred. Complete it now. */ |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1027 | if (!ssl_negotiate_alpn(hs, &al, &client_hello)) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 1028 | goto f_err; |
| 1029 | } |
| 1030 | |
| 1031 | /* Now that all parameters are known, initialize the handshake hash. */ |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1032 | if (!ssl3_init_handshake_hash(ssl)) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1033 | goto f_err; |
| 1034 | } |
| 1035 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1036 | /* Release the handshake buffer if client authentication isn't required. */ |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1037 | if (!hs->cert_request) { |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1038 | ssl3_free_handshake_buffer(ssl); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1039 | } |
| 1040 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1041 | ret = 1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1042 | |
| 1043 | if (0) { |
| 1044 | f_err: |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1045 | ssl3_send_alert(ssl, SSL3_AL_FATAL, al); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1046 | } |
| 1047 | |
| 1048 | err: |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1049 | SSL_SESSION_free(session); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1050 | return ret; |
| 1051 | } |
| 1052 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1053 | static int ssl3_send_server_hello(SSL_HANDSHAKE *hs) { |
| 1054 | SSL *const ssl = hs->ssl; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1055 | if (hs->state == SSL3_ST_SW_SRVR_HELLO_B) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1056 | return ssl->method->write_message(ssl); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1057 | } |
| 1058 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1059 | assert(hs->state == SSL3_ST_SW_SRVR_HELLO_A); |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 1060 | |
| 1061 | /* We only accept ChannelIDs on connections with ECDHE in order to avoid a |
| 1062 | * known attack while we fix ChannelID itself. */ |
| 1063 | if (ssl->s3->tlsext_channel_id_valid && |
| 1064 | (ssl->s3->tmp.new_cipher->algorithm_mkey & SSL_kECDHE) == 0) { |
| 1065 | ssl->s3->tlsext_channel_id_valid = 0; |
| 1066 | } |
| 1067 | |
| 1068 | /* If this is a resumption and the original handshake didn't support |
| 1069 | * ChannelID then we didn't record the original handshake hashes in the |
| 1070 | * session and so cannot resume with ChannelIDs. */ |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1071 | if (ssl->session != NULL && |
| 1072 | ssl->session->original_handshake_hash_len == 0) { |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 1073 | ssl->s3->tlsext_channel_id_valid = 0; |
| 1074 | } |
| 1075 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1076 | struct timeval now; |
| 1077 | ssl_get_current_time(ssl, &now); |
| 1078 | ssl->s3->server_random[0] = now.tv_sec >> 24; |
| 1079 | ssl->s3->server_random[1] = now.tv_sec >> 16; |
| 1080 | ssl->s3->server_random[2] = now.tv_sec >> 8; |
| 1081 | ssl->s3->server_random[3] = now.tv_sec; |
| 1082 | if (!RAND_bytes(ssl->s3->server_random + 4, SSL3_RANDOM_SIZE - 4)) { |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 1083 | return -1; |
| 1084 | } |
| 1085 | |
David Benjamin | 7c0d06c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1086 | /* TODO(davidben): Implement the TLS 1.1 and 1.2 downgrade sentinels once TLS |
| 1087 | * 1.3 is finalized and we are not implementing a draft version. */ |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1088 | |
| 1089 | const SSL_SESSION *session = ssl->s3->new_session; |
| 1090 | if (ssl->session != NULL) { |
| 1091 | session = ssl->session; |
| 1092 | } |
| 1093 | |
| 1094 | CBB cbb, body, session_id; |
| 1095 | if (!ssl->method->init_message(ssl, &cbb, &body, SSL3_MT_SERVER_HELLO) || |
| 1096 | !CBB_add_u16(&body, ssl->version) || |
| 1097 | !CBB_add_bytes(&body, ssl->s3->server_random, SSL3_RANDOM_SIZE) || |
| 1098 | !CBB_add_u8_length_prefixed(&body, &session_id) || |
| 1099 | !CBB_add_bytes(&session_id, session->session_id, |
| 1100 | session->session_id_length) || |
| 1101 | !CBB_add_u16(&body, ssl_cipher_get_value(ssl->s3->tmp.new_cipher)) || |
| 1102 | !CBB_add_u8(&body, 0 /* no compression */) || |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1103 | !ssl_add_serverhello_tlsext(hs, &body) || |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 1104 | !ssl_complete_message(ssl, &cbb)) { |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 1105 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| 1106 | CBB_cleanup(&cbb); |
| 1107 | return -1; |
| 1108 | } |
| 1109 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1110 | hs->state = SSL3_ST_SW_SRVR_HELLO_B; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1111 | return ssl->method->write_message(ssl); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1112 | } |
| 1113 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1114 | static int ssl3_send_server_certificate(SSL_HANDSHAKE *hs) { |
| 1115 | SSL *const ssl = hs->ssl; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1116 | if (hs->state == SSL3_ST_SW_CERT_B) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1117 | return ssl->method->write_message(ssl); |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1118 | } |
| 1119 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1120 | if (!ssl_has_certificate(ssl)) { |
| 1121 | OPENSSL_PUT_ERROR(SSL, SSL_R_NO_CERTIFICATE_SET); |
| 1122 | return 0; |
| 1123 | } |
| 1124 | |
| 1125 | if (!ssl3_output_cert_chain(ssl)) { |
| 1126 | return 0; |
| 1127 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1128 | hs->state = SSL3_ST_SW_CERT_B; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1129 | return ssl->method->write_message(ssl); |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1130 | } |
| 1131 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1132 | static int ssl3_send_certificate_status(SSL_HANDSHAKE *hs) { |
| 1133 | SSL *const ssl = hs->ssl; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1134 | if (hs->state == SSL3_ST_SW_CERT_STATUS_B) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1135 | return ssl->method->write_message(ssl); |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1136 | } |
| 1137 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1138 | CBB cbb, body, ocsp_response; |
| 1139 | if (!ssl->method->init_message(ssl, &cbb, &body, |
| 1140 | SSL3_MT_CERTIFICATE_STATUS) || |
| 1141 | !CBB_add_u8(&body, TLSEXT_STATUSTYPE_ocsp) || |
| 1142 | !CBB_add_u24_length_prefixed(&body, &ocsp_response) || |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1143 | !CBB_add_bytes(&ocsp_response, CRYPTO_BUFFER_data(ssl->ocsp_response), |
| 1144 | CRYPTO_BUFFER_len(ssl->ocsp_response)) || |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 1145 | !ssl_complete_message(ssl, &cbb)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1146 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| 1147 | CBB_cleanup(&cbb); |
| 1148 | return -1; |
| 1149 | } |
| 1150 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1151 | hs->state = SSL3_ST_SW_CERT_STATUS_B; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1152 | return ssl->method->write_message(ssl); |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1153 | } |
| 1154 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1155 | static int ssl3_send_server_key_exchange(SSL_HANDSHAKE *hs) { |
| 1156 | SSL *const ssl = hs->ssl; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1157 | if (hs->state == SSL3_ST_SW_KEY_EXCH_C) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1158 | return ssl->method->write_message(ssl); |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1159 | } |
| 1160 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1161 | CBB cbb, child; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1162 | CBB_zero(&cbb); |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1163 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1164 | /* Put together the parameters. */ |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1165 | if (hs->state == SSL3_ST_SW_KEY_EXCH_A) { |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1166 | uint32_t alg_k = ssl->s3->tmp.new_cipher->algorithm_mkey; |
| 1167 | uint32_t alg_a = ssl->s3->tmp.new_cipher->algorithm_auth; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1168 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1169 | /* Pre-allocate enough room to comfortably fit an ECDHE public key. */ |
| 1170 | if (!CBB_init(&cbb, 128)) { |
| 1171 | goto err; |
| 1172 | } |
| 1173 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1174 | /* PSK ciphers begin with an identity hint. */ |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1175 | if (alg_a & SSL_aPSK) { |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1176 | size_t len = |
| 1177 | (ssl->psk_identity_hint == NULL) ? 0 : strlen(ssl->psk_identity_hint); |
| 1178 | if (!CBB_add_u16_length_prefixed(&cbb, &child) || |
| 1179 | !CBB_add_bytes(&child, (const uint8_t *)ssl->psk_identity_hint, |
| 1180 | len)) { |
| 1181 | goto err; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1182 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1183 | } |
| 1184 | |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 1185 | if (alg_k & SSL_kDHE) { |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1186 | /* Determine the group to use. */ |
| 1187 | DH *params = ssl->cert->dh_tmp; |
| 1188 | if (params == NULL && ssl->cert->dh_tmp_cb != NULL) { |
| 1189 | params = ssl->cert->dh_tmp_cb(ssl, 0, 1024); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1190 | } |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1191 | if (params == NULL) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1192 | OPENSSL_PUT_ERROR(SSL, SSL_R_MISSING_TMP_DH_KEY); |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1193 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1194 | goto err; |
| 1195 | } |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1196 | |
| 1197 | /* Set up DH, generate a key, and emit the public half. */ |
| 1198 | DH *dh = DHparams_dup(params); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1199 | if (dh == NULL) { |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 1200 | goto err; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1201 | } |
| 1202 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1203 | SSL_ECDH_CTX_init_for_dhe(&hs->ecdh_ctx, dh); |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1204 | if (!CBB_add_u16_length_prefixed(&cbb, &child) || |
| 1205 | !BN_bn2cbb_padded(&child, BN_num_bytes(params->p), params->p) || |
| 1206 | !CBB_add_u16_length_prefixed(&cbb, &child) || |
| 1207 | !BN_bn2cbb_padded(&child, BN_num_bytes(params->g), params->g) || |
| 1208 | !CBB_add_u16_length_prefixed(&cbb, &child) || |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1209 | !SSL_ECDH_CTX_offer(&hs->ecdh_ctx, &child)) { |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1210 | goto err; |
| 1211 | } |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 1212 | } else if (alg_k & SSL_kECDHE) { |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 1213 | /* Determine the group to use. */ |
| 1214 | uint16_t group_id; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1215 | if (!tls1_get_shared_group(hs, &group_id)) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1216 | OPENSSL_PUT_ERROR(SSL, SSL_R_MISSING_TMP_ECDH_KEY); |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1217 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1218 | goto err; |
| 1219 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1220 | ssl->s3->new_session->group_id = group_id; |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1221 | |
| 1222 | /* Set up ECDH, generate a key, and emit the public half. */ |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1223 | if (!SSL_ECDH_CTX_init(&hs->ecdh_ctx, group_id) || |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1224 | !CBB_add_u8(&cbb, NAMED_CURVE_TYPE) || |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 1225 | !CBB_add_u16(&cbb, group_id) || |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1226 | !CBB_add_u8_length_prefixed(&cbb, &child) || |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1227 | !SSL_ECDH_CTX_offer(&hs->ecdh_ctx, &child)) { |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 1228 | goto err; |
| 1229 | } |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1230 | } else { |
| 1231 | assert(alg_k & SSL_kPSK); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1232 | } |
| 1233 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1234 | if (!CBB_finish(&cbb, &hs->server_params, &hs->server_params_len)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1235 | goto err; |
| 1236 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1237 | } |
| 1238 | |
| 1239 | /* Assemble the message. */ |
| 1240 | CBB body; |
| 1241 | if (!ssl->method->init_message(ssl, &cbb, &body, |
| 1242 | SSL3_MT_SERVER_KEY_EXCHANGE) || |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1243 | !CBB_add_bytes(&body, hs->server_params, hs->server_params_len)) { |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1244 | goto err; |
| 1245 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1246 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1247 | /* Add a signature. */ |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 1248 | if (ssl_cipher_uses_certificate_auth(ssl->s3->tmp.new_cipher)) { |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1249 | if (!ssl_has_private_key(ssl)) { |
| 1250 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1251 | goto err; |
| 1252 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1253 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1254 | /* Determine the signature algorithm. */ |
| 1255 | uint16_t signature_algorithm; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1256 | if (!tls1_choose_signature_algorithm(hs, &signature_algorithm)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1257 | goto err; |
| 1258 | } |
| 1259 | if (ssl3_protocol_version(ssl) >= TLS1_2_VERSION) { |
| 1260 | if (!CBB_add_u16(&body, signature_algorithm)) { |
| 1261 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| 1262 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 1263 | goto err; |
| 1264 | } |
| 1265 | } |
| 1266 | |
| 1267 | /* Add space for the signature. */ |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1268 | const size_t max_sig_len = ssl_private_key_max_signature_len(ssl); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1269 | uint8_t *ptr; |
| 1270 | if (!CBB_add_u16_length_prefixed(&body, &child) || |
| 1271 | !CBB_reserve(&child, &ptr, max_sig_len)) { |
| 1272 | goto err; |
| 1273 | } |
| 1274 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1275 | size_t sig_len; |
| 1276 | enum ssl_private_key_result_t sign_result; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1277 | if (hs->state == SSL3_ST_SW_KEY_EXCH_A) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1278 | CBB transcript; |
| 1279 | uint8_t *transcript_data; |
| 1280 | size_t transcript_len; |
| 1281 | if (!CBB_init(&transcript, |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1282 | 2 * SSL3_RANDOM_SIZE + hs->server_params_len) || |
| 1283 | !CBB_add_bytes(&transcript, ssl->s3->client_random, |
| 1284 | SSL3_RANDOM_SIZE) || |
| 1285 | !CBB_add_bytes(&transcript, ssl->s3->server_random, |
| 1286 | SSL3_RANDOM_SIZE) || |
| 1287 | !CBB_add_bytes(&transcript, hs->server_params, |
| 1288 | hs->server_params_len) || |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1289 | !CBB_finish(&transcript, &transcript_data, &transcript_len)) { |
| 1290 | CBB_cleanup(&transcript); |
| 1291 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| 1292 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1293 | goto err; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1294 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1295 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1296 | sign_result = ssl_private_key_sign(ssl, ptr, &sig_len, max_sig_len, |
| 1297 | signature_algorithm, transcript_data, |
| 1298 | transcript_len); |
| 1299 | OPENSSL_free(transcript_data); |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1300 | } else { |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1301 | assert(hs->state == SSL3_ST_SW_KEY_EXCH_B); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1302 | sign_result = ssl_private_key_complete(ssl, ptr, &sig_len, max_sig_len); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1303 | } |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1304 | |
| 1305 | switch (sign_result) { |
| 1306 | case ssl_private_key_success: |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1307 | if (!CBB_did_write(&child, sig_len)) { |
| 1308 | goto err; |
| 1309 | } |
| 1310 | break; |
| 1311 | case ssl_private_key_failure: |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1312 | goto err; |
| 1313 | case ssl_private_key_retry: |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1314 | ssl->rwstate = SSL_PRIVATE_KEY_OPERATION; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1315 | hs->state = SSL3_ST_SW_KEY_EXCH_B; |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1316 | goto err; |
| 1317 | } |
Adam Langley | 1e4884f | 2015-09-24 10:57:52 -0700 | [diff] [blame] | 1318 | } |
| 1319 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 1320 | if (!ssl_complete_message(ssl, &cbb)) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1321 | goto err; |
| 1322 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1323 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1324 | OPENSSL_free(hs->server_params); |
| 1325 | hs->server_params = NULL; |
| 1326 | hs->server_params_len = 0; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1327 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1328 | hs->state = SSL3_ST_SW_KEY_EXCH_C; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1329 | return ssl->method->write_message(ssl); |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1330 | |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1331 | err: |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1332 | CBB_cleanup(&cbb); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1333 | return -1; |
| 1334 | } |
| 1335 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1336 | static int add_cert_types(SSL *ssl, CBB *cbb) { |
| 1337 | /* Get configured signature algorithms. */ |
| 1338 | int have_rsa_sign = 0; |
| 1339 | int have_ecdsa_sign = 0; |
| 1340 | const uint16_t *sig_algs; |
David Benjamin | 95add82 | 2016-10-19 01:09:12 -0400 | [diff] [blame] | 1341 | size_t num_sig_algs = tls12_get_verify_sigalgs(ssl, &sig_algs); |
| 1342 | for (size_t i = 0; i < num_sig_algs; i++) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1343 | switch (sig_algs[i]) { |
| 1344 | case SSL_SIGN_RSA_PKCS1_SHA512: |
| 1345 | case SSL_SIGN_RSA_PKCS1_SHA384: |
| 1346 | case SSL_SIGN_RSA_PKCS1_SHA256: |
| 1347 | case SSL_SIGN_RSA_PKCS1_SHA1: |
| 1348 | have_rsa_sign = 1; |
| 1349 | break; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1350 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1351 | case SSL_SIGN_ECDSA_SECP521R1_SHA512: |
| 1352 | case SSL_SIGN_ECDSA_SECP384R1_SHA384: |
| 1353 | case SSL_SIGN_ECDSA_SECP256R1_SHA256: |
| 1354 | case SSL_SIGN_ECDSA_SHA1: |
| 1355 | have_ecdsa_sign = 1; |
| 1356 | break; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1357 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1358 | } |
| 1359 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1360 | if (have_rsa_sign && !CBB_add_u8(cbb, SSL3_CT_RSA_SIGN)) { |
| 1361 | return 0; |
| 1362 | } |
| 1363 | |
| 1364 | /* ECDSA certs can be used with RSA cipher suites as well so we don't need to |
| 1365 | * check for SSL_kECDH or SSL_kECDHE. */ |
| 1366 | if (ssl->version >= TLS1_VERSION && have_ecdsa_sign && |
| 1367 | !CBB_add_u8(cbb, TLS_CT_ECDSA_SIGN)) { |
| 1368 | return 0; |
| 1369 | } |
| 1370 | |
| 1371 | return 1; |
| 1372 | } |
| 1373 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1374 | static int ssl3_send_certificate_request(SSL_HANDSHAKE *hs) { |
| 1375 | SSL *const ssl = hs->ssl; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1376 | if (hs->state == SSL3_ST_SW_CERT_REQ_B) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1377 | return ssl->method->write_message(ssl); |
| 1378 | } |
| 1379 | |
| 1380 | CBB cbb, body, cert_types, sigalgs_cbb; |
| 1381 | if (!ssl->method->init_message(ssl, &cbb, &body, |
| 1382 | SSL3_MT_CERTIFICATE_REQUEST) || |
| 1383 | !CBB_add_u8_length_prefixed(&body, &cert_types) || |
| 1384 | !add_cert_types(ssl, &cert_types)) { |
| 1385 | goto err; |
| 1386 | } |
| 1387 | |
| 1388 | if (ssl3_protocol_version(ssl) >= TLS1_2_VERSION) { |
| 1389 | const uint16_t *sigalgs; |
David Benjamin | 95add82 | 2016-10-19 01:09:12 -0400 | [diff] [blame] | 1390 | size_t num_sigalgs = tls12_get_verify_sigalgs(ssl, &sigalgs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1391 | if (!CBB_add_u16_length_prefixed(&body, &sigalgs_cbb)) { |
| 1392 | goto err; |
| 1393 | } |
| 1394 | |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1395 | for (size_t i = 0; i < num_sigalgs; i++) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1396 | if (!CBB_add_u16(&sigalgs_cbb, sigalgs[i])) { |
| 1397 | goto err; |
| 1398 | } |
| 1399 | } |
| 1400 | } |
| 1401 | |
| 1402 | if (!ssl_add_client_CA_list(ssl, &body) || |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 1403 | !ssl_complete_message(ssl, &cbb)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1404 | goto err; |
| 1405 | } |
| 1406 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1407 | hs->state = SSL3_ST_SW_CERT_REQ_B; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1408 | return ssl->method->write_message(ssl); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1409 | |
| 1410 | err: |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1411 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| 1412 | CBB_cleanup(&cbb); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1413 | return -1; |
| 1414 | } |
| 1415 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1416 | static int ssl3_send_server_hello_done(SSL_HANDSHAKE *hs) { |
| 1417 | SSL *const ssl = hs->ssl; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1418 | if (hs->state == SSL3_ST_SW_SRVR_DONE_B) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1419 | return ssl->method->write_message(ssl); |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1420 | } |
| 1421 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1422 | CBB cbb, body; |
| 1423 | if (!ssl->method->init_message(ssl, &cbb, &body, SSL3_MT_SERVER_HELLO_DONE) || |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 1424 | !ssl_complete_message(ssl, &cbb)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1425 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| 1426 | CBB_cleanup(&cbb); |
| 1427 | return -1; |
| 1428 | } |
| 1429 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1430 | hs->state = SSL3_ST_SW_SRVR_DONE_B; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1431 | return ssl->method->write_message(ssl); |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1432 | } |
| 1433 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1434 | static int ssl3_get_client_certificate(SSL_HANDSHAKE *hs) { |
| 1435 | SSL *const ssl = hs->ssl; |
| 1436 | assert(hs->cert_request); |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1437 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1438 | int msg_ret = ssl->method->ssl_get_message(ssl, -1, ssl_hash_message); |
| 1439 | if (msg_ret <= 0) { |
| 1440 | return msg_ret; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1441 | } |
| 1442 | |
| 1443 | if (ssl->s3->tmp.message_type != SSL3_MT_CERTIFICATE) { |
| 1444 | if (ssl->version == SSL3_VERSION && |
| 1445 | ssl->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) { |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1446 | /* In SSL 3.0, the Certificate message is omitted to signal no |
| 1447 | * certificate. */ |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1448 | if (ssl->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) { |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1449 | OPENSSL_PUT_ERROR(SSL, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1450 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); |
| 1451 | return -1; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1452 | } |
| 1453 | |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1454 | /* OpenSSL returns X509_V_OK when no certificates are received. This is |
| 1455 | * classed by them as a bug, but it's assumed by at least NGINX. */ |
| 1456 | ssl->s3->new_session->verify_result = X509_V_OK; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1457 | ssl->s3->tmp.reuse_message = 1; |
| 1458 | return 1; |
| 1459 | } |
| 1460 | |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1461 | OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_MESSAGE); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1462 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); |
| 1463 | return -1; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1464 | } |
| 1465 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1466 | CBS certificate_msg; |
| 1467 | CBS_init(&certificate_msg, ssl->init_msg, ssl->init_num); |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1468 | |
| 1469 | sk_CRYPTO_BUFFER_pop_free(ssl->s3->new_session->certs, CRYPTO_BUFFER_free); |
| 1470 | EVP_PKEY_free(hs->peer_pubkey); |
| 1471 | hs->peer_pubkey = NULL; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1472 | uint8_t alert; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1473 | ssl->s3->new_session->certs = |
| 1474 | ssl_parse_cert_chain(&alert, &hs->peer_pubkey, |
| 1475 | ssl->retain_only_sha256_of_client_certs |
| 1476 | ? ssl->s3->new_session->peer_sha256 |
| 1477 | : NULL, |
| 1478 | &certificate_msg, ssl->ctx->pool); |
| 1479 | if (ssl->s3->new_session->certs == NULL) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1480 | ssl3_send_alert(ssl, SSL3_AL_FATAL, alert); |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1481 | return -1; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1482 | } |
| 1483 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1484 | if (CBS_len(&certificate_msg) != 0 || |
| 1485 | !ssl_session_x509_cache_objects(ssl->s3->new_session)) { |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1486 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1487 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1488 | return -1; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1489 | } |
| 1490 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1491 | if (sk_CRYPTO_BUFFER_num(ssl->s3->new_session->certs) == 0) { |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1492 | /* No client certificate so the handshake buffer may be discarded. */ |
| 1493 | ssl3_free_handshake_buffer(ssl); |
| 1494 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1495 | /* In SSL 3.0, sending no certificate is signaled by omitting the |
| 1496 | * Certificate message. */ |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1497 | if (ssl->version == SSL3_VERSION) { |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1498 | OPENSSL_PUT_ERROR(SSL, SSL_R_NO_CERTIFICATES_RETURNED); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1499 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1500 | return -1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1501 | } |
| 1502 | |
| 1503 | if (ssl->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) { |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1504 | /* Fail for TLS only if we required a certificate */ |
| 1505 | OPENSSL_PUT_ERROR(SSL, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1506 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1507 | return -1; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1508 | } |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1509 | |
| 1510 | /* OpenSSL returns X509_V_OK when no certificates are received. This is |
| 1511 | * classed by them as a bug, but it's assumed by at least NGINX. */ |
| 1512 | ssl->s3->new_session->verify_result = X509_V_OK; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1513 | return 1; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1514 | } |
| 1515 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1516 | /* The hash will have been filled in. */ |
| 1517 | if (ssl->retain_only_sha256_of_client_certs) { |
| 1518 | ssl->s3->new_session->peer_sha256_valid = 1; |
| 1519 | } |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1520 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1521 | if (!ssl_verify_cert_chain(ssl, &ssl->s3->new_session->verify_result, |
| 1522 | ssl->s3->new_session->x509_chain)) { |
| 1523 | return -1; |
| 1524 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1525 | return 1; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1526 | } |
| 1527 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1528 | static int ssl3_get_client_key_exchange(SSL_HANDSHAKE *hs) { |
| 1529 | SSL *const ssl = hs->ssl; |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 1530 | int al; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1531 | CBS client_key_exchange; |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 1532 | uint32_t alg_k; |
| 1533 | uint32_t alg_a; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1534 | uint8_t *premaster_secret = NULL; |
| 1535 | size_t premaster_secret_len = 0; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1536 | uint8_t *decrypt_buf = NULL; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1537 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1538 | unsigned psk_len = 0; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1539 | uint8_t psk[PSK_MAX_PSK_LEN]; |
| 1540 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1541 | if (hs->state == SSL3_ST_SR_KEY_EXCH_A) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1542 | int ret = ssl->method->ssl_get_message(ssl, SSL3_MT_CLIENT_KEY_EXCHANGE, |
| 1543 | ssl_hash_message); |
| 1544 | if (ret <= 0) { |
| 1545 | return ret; |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 1546 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1547 | } |
| 1548 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1549 | CBS_init(&client_key_exchange, ssl->init_msg, ssl->init_num); |
| 1550 | alg_k = ssl->s3->tmp.new_cipher->algorithm_mkey; |
| 1551 | alg_a = ssl->s3->tmp.new_cipher->algorithm_auth; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1552 | |
| 1553 | /* If using a PSK key exchange, prepare the pre-shared key. */ |
| 1554 | if (alg_a & SSL_aPSK) { |
| 1555 | CBS psk_identity; |
| 1556 | |
| 1557 | /* If using PSK, the ClientKeyExchange contains a psk_identity. If PSK, |
| 1558 | * then this is the only field in the message. */ |
| 1559 | if (!CBS_get_u16_length_prefixed(&client_key_exchange, &psk_identity) || |
| 1560 | ((alg_k & SSL_kPSK) && CBS_len(&client_key_exchange) != 0)) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1561 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1562 | al = SSL_AD_DECODE_ERROR; |
| 1563 | goto f_err; |
| 1564 | } |
| 1565 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1566 | if (ssl->psk_server_callback == NULL) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1567 | OPENSSL_PUT_ERROR(SSL, SSL_R_PSK_NO_SERVER_CB); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1568 | al = SSL_AD_INTERNAL_ERROR; |
| 1569 | goto f_err; |
| 1570 | } |
| 1571 | |
| 1572 | if (CBS_len(&psk_identity) > PSK_MAX_IDENTITY_LEN || |
| 1573 | CBS_contains_zero_byte(&psk_identity)) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1574 | OPENSSL_PUT_ERROR(SSL, SSL_R_DATA_LENGTH_TOO_LONG); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1575 | al = SSL_AD_ILLEGAL_PARAMETER; |
| 1576 | goto f_err; |
| 1577 | } |
| 1578 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1579 | if (!CBS_strdup(&psk_identity, &ssl->s3->new_session->psk_identity)) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1580 | al = SSL_AD_INTERNAL_ERROR; |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1581 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1582 | goto f_err; |
| 1583 | } |
| 1584 | |
| 1585 | /* Look up the key for the identity. */ |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1586 | psk_len = ssl->psk_server_callback(ssl, ssl->s3->new_session->psk_identity, |
| 1587 | psk, sizeof(psk)); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1588 | if (psk_len > PSK_MAX_PSK_LEN) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1589 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1590 | al = SSL_AD_INTERNAL_ERROR; |
| 1591 | goto f_err; |
| 1592 | } else if (psk_len == 0) { |
| 1593 | /* PSK related to the given identity not found */ |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1594 | OPENSSL_PUT_ERROR(SSL, SSL_R_PSK_IDENTITY_NOT_FOUND); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1595 | al = SSL_AD_UNKNOWN_PSK_IDENTITY; |
| 1596 | goto f_err; |
| 1597 | } |
| 1598 | } |
| 1599 | |
| 1600 | /* Depending on the key exchange method, compute |premaster_secret| and |
| 1601 | * |premaster_secret_len|. */ |
| 1602 | if (alg_k & SSL_kRSA) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1603 | /* Allocate a buffer large enough for an RSA decryption. */ |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1604 | const size_t rsa_size = ssl_private_key_max_signature_len(ssl); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1605 | decrypt_buf = OPENSSL_malloc(rsa_size); |
| 1606 | if (decrypt_buf == NULL) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1607 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1608 | goto err; |
| 1609 | } |
| 1610 | |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 1611 | enum ssl_private_key_result_t decrypt_result; |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1612 | size_t decrypt_len; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1613 | if (hs->state == SSL3_ST_SR_KEY_EXCH_A) { |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1614 | if (!ssl_has_private_key(ssl) || |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1615 | ssl_private_key_type(ssl) != NID_rsaEncryption) { |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 1616 | al = SSL_AD_HANDSHAKE_FAILURE; |
| 1617 | OPENSSL_PUT_ERROR(SSL, SSL_R_MISSING_RSA_CERTIFICATE); |
| 1618 | goto f_err; |
| 1619 | } |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1620 | CBS encrypted_premaster_secret; |
| 1621 | if (ssl->version > SSL3_VERSION) { |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 1622 | if (!CBS_get_u16_length_prefixed(&client_key_exchange, |
| 1623 | &encrypted_premaster_secret) || |
| 1624 | CBS_len(&client_key_exchange) != 0) { |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1625 | al = SSL_AD_DECODE_ERROR; |
| 1626 | OPENSSL_PUT_ERROR(SSL, |
| 1627 | SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG); |
| 1628 | goto f_err; |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 1629 | } |
| 1630 | } else { |
| 1631 | encrypted_premaster_secret = client_key_exchange; |
| 1632 | } |
| 1633 | |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 1634 | /* Decrypt with no padding. PKCS#1 padding will be removed as part of the |
| 1635 | * timing-sensitive code below. */ |
| 1636 | decrypt_result = ssl_private_key_decrypt( |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1637 | ssl, decrypt_buf, &decrypt_len, rsa_size, |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 1638 | CBS_data(&encrypted_premaster_secret), |
| 1639 | CBS_len(&encrypted_premaster_secret)); |
| 1640 | } else { |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1641 | assert(hs->state == SSL3_ST_SR_KEY_EXCH_B); |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 1642 | /* Complete async decrypt. */ |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1643 | decrypt_result = |
| 1644 | ssl_private_key_complete(ssl, decrypt_buf, &decrypt_len, rsa_size); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1645 | } |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 1646 | |
| 1647 | switch (decrypt_result) { |
| 1648 | case ssl_private_key_success: |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 1649 | break; |
| 1650 | case ssl_private_key_failure: |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 1651 | goto err; |
| 1652 | case ssl_private_key_retry: |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1653 | ssl->rwstate = SSL_PRIVATE_KEY_OPERATION; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1654 | hs->state = SSL3_ST_SR_KEY_EXCH_B; |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 1655 | goto err; |
| 1656 | } |
| 1657 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 1658 | if (decrypt_len != rsa_size) { |
| 1659 | al = SSL_AD_DECRYPT_ERROR; |
| 1660 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECRYPTION_FAILED); |
| 1661 | goto f_err; |
| 1662 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1663 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1664 | /* Prepare a random premaster, to be used on invalid padding. See RFC 5246, |
| 1665 | * section 7.4.7.1. */ |
| 1666 | premaster_secret_len = SSL_MAX_MASTER_KEY_LENGTH; |
| 1667 | premaster_secret = OPENSSL_malloc(premaster_secret_len); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1668 | if (premaster_secret == NULL) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1669 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1670 | goto err; |
| 1671 | } |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1672 | if (!RAND_bytes(premaster_secret, premaster_secret_len)) { |
| 1673 | goto err; |
| 1674 | } |
| 1675 | |
| 1676 | /* The smallest padded premaster is 11 bytes of overhead. Small keys are |
| 1677 | * publicly invalid. */ |
| 1678 | if (decrypt_len < 11 + premaster_secret_len) { |
| 1679 | al = SSL_AD_DECRYPT_ERROR; |
| 1680 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECRYPTION_FAILED); |
| 1681 | goto f_err; |
| 1682 | } |
| 1683 | |
| 1684 | /* Check the padding. See RFC 3447, section 7.2.2. */ |
| 1685 | size_t padding_len = decrypt_len - premaster_secret_len; |
| 1686 | uint8_t good = constant_time_eq_int_8(decrypt_buf[0], 0) & |
| 1687 | constant_time_eq_int_8(decrypt_buf[1], 2); |
David Benjamin | 7c0d06c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1688 | for (size_t i = 2; i < padding_len - 1; i++) { |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1689 | good &= ~constant_time_is_zero_8(decrypt_buf[i]); |
| 1690 | } |
| 1691 | good &= constant_time_is_zero_8(decrypt_buf[padding_len - 1]); |
| 1692 | |
| 1693 | /* The premaster secret must begin with |client_version|. This too must be |
| 1694 | * checked in constant time (http://eprint.iacr.org/2003/052/). */ |
| 1695 | good &= constant_time_eq_8(decrypt_buf[padding_len], |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1696 | (unsigned)(hs->client_version >> 8)); |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1697 | good &= constant_time_eq_8(decrypt_buf[padding_len + 1], |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1698 | (unsigned)(hs->client_version & 0xff)); |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1699 | |
| 1700 | /* Select, in constant time, either the decrypted premaster or the random |
| 1701 | * premaster based on |good|. */ |
David Benjamin | 7c0d06c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1702 | for (size_t i = 0; i < premaster_secret_len; i++) { |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1703 | premaster_secret[i] = constant_time_select_8( |
| 1704 | good, decrypt_buf[padding_len + i], premaster_secret[i]); |
| 1705 | } |
| 1706 | |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1707 | OPENSSL_free(decrypt_buf); |
| 1708 | decrypt_buf = NULL; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1709 | } else if (alg_k & (SSL_kECDHE|SSL_kDHE)) { |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 1710 | /* Parse the ClientKeyExchange. */ |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1711 | CBS peer_key; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1712 | if (!SSL_ECDH_CTX_get_key(&hs->ecdh_ctx, &client_key_exchange, &peer_key) || |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 1713 | CBS_len(&client_key_exchange) != 0) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1714 | al = SSL_AD_DECODE_ERROR; |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1715 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1716 | goto f_err; |
| 1717 | } |
| 1718 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1719 | /* Compute the premaster. */ |
| 1720 | uint8_t alert; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1721 | if (!SSL_ECDH_CTX_finish(&hs->ecdh_ctx, &premaster_secret, |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 1722 | &premaster_secret_len, &alert, CBS_data(&peer_key), |
| 1723 | CBS_len(&peer_key))) { |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1724 | al = alert; |
| 1725 | goto f_err; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1726 | } |
| 1727 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1728 | /* The key exchange state may now be discarded. */ |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1729 | SSL_ECDH_CTX_cleanup(&hs->ecdh_ctx); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1730 | } else if (alg_k & SSL_kPSK) { |
| 1731 | /* For plain PSK, other_secret is a block of 0s with the same length as the |
| 1732 | * pre-shared key. */ |
| 1733 | premaster_secret_len = psk_len; |
| 1734 | premaster_secret = OPENSSL_malloc(premaster_secret_len); |
| 1735 | if (premaster_secret == NULL) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1736 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1737 | goto err; |
| 1738 | } |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 1739 | OPENSSL_memset(premaster_secret, 0, premaster_secret_len); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1740 | } else { |
| 1741 | al = SSL_AD_HANDSHAKE_FAILURE; |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1742 | OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_CIPHER_TYPE); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1743 | goto f_err; |
| 1744 | } |
| 1745 | |
| 1746 | /* For a PSK cipher suite, the actual pre-master secret is combined with the |
| 1747 | * pre-shared key. */ |
| 1748 | if (alg_a & SSL_aPSK) { |
| 1749 | CBB new_premaster, child; |
| 1750 | uint8_t *new_data; |
| 1751 | size_t new_len; |
| 1752 | |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1753 | CBB_zero(&new_premaster); |
| 1754 | if (!CBB_init(&new_premaster, 2 + psk_len + 2 + premaster_secret_len) || |
| 1755 | !CBB_add_u16_length_prefixed(&new_premaster, &child) || |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1756 | !CBB_add_bytes(&child, premaster_secret, premaster_secret_len) || |
| 1757 | !CBB_add_u16_length_prefixed(&new_premaster, &child) || |
| 1758 | !CBB_add_bytes(&child, psk, psk_len) || |
| 1759 | !CBB_finish(&new_premaster, &new_data, &new_len)) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1760 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1761 | CBB_cleanup(&new_premaster); |
| 1762 | goto err; |
| 1763 | } |
| 1764 | |
| 1765 | OPENSSL_cleanse(premaster_secret, premaster_secret_len); |
| 1766 | OPENSSL_free(premaster_secret); |
| 1767 | premaster_secret = new_data; |
| 1768 | premaster_secret_len = new_len; |
| 1769 | } |
| 1770 | |
| 1771 | /* Compute the master secret */ |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1772 | ssl->s3->new_session->master_key_length = tls1_generate_master_secret( |
| 1773 | ssl, ssl->s3->new_session->master_key, premaster_secret, |
| 1774 | premaster_secret_len); |
| 1775 | if (ssl->s3->new_session->master_key_length == 0) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1776 | goto err; |
| 1777 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1778 | ssl->s3->new_session->extended_master_secret = |
| 1779 | ssl->s3->tmp.extended_master_secret; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1780 | |
| 1781 | OPENSSL_cleanse(premaster_secret, premaster_secret_len); |
| 1782 | OPENSSL_free(premaster_secret); |
| 1783 | return 1; |
| 1784 | |
| 1785 | f_err: |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1786 | ssl3_send_alert(ssl, SSL3_AL_FATAL, al); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1787 | err: |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1788 | if (premaster_secret != NULL) { |
| 1789 | OPENSSL_cleanse(premaster_secret, premaster_secret_len); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1790 | OPENSSL_free(premaster_secret); |
| 1791 | } |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 1792 | OPENSSL_free(decrypt_buf); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1793 | |
| 1794 | return -1; |
| 1795 | } |
| 1796 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1797 | static int ssl3_get_cert_verify(SSL_HANDSHAKE *hs) { |
| 1798 | SSL *const ssl = hs->ssl; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1799 | int al; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1800 | CBS certificate_verify, signature; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1801 | |
| 1802 | /* Only RSA and ECDSA client certificates are supported, so a |
| 1803 | * CertificateVerify is required if and only if there's a client certificate. |
| 1804 | * */ |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1805 | if (hs->peer_pubkey == NULL) { |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1806 | ssl3_free_handshake_buffer(ssl); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1807 | return 1; |
| 1808 | } |
| 1809 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1810 | int msg_ret = ssl->method->ssl_get_message(ssl, SSL3_MT_CERTIFICATE_VERIFY, |
| 1811 | ssl_dont_hash_message); |
| 1812 | if (msg_ret <= 0) { |
| 1813 | return msg_ret; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1814 | } |
| 1815 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1816 | CBS_init(&certificate_verify, ssl->init_msg, ssl->init_num); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1817 | |
| 1818 | /* Determine the digest type if needbe. */ |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1819 | uint16_t signature_algorithm = 0; |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 1820 | if (ssl3_protocol_version(ssl) >= TLS1_2_VERSION) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1821 | if (!CBS_get_u16(&certificate_verify, &signature_algorithm)) { |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1822 | al = SSL_AD_DECODE_ERROR; |
| 1823 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 1824 | goto f_err; |
| 1825 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1826 | if (!tls12_check_peer_sigalg(ssl, &al, signature_algorithm)) { |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1827 | goto f_err; |
| 1828 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1829 | ssl->s3->new_session->peer_signature_algorithm = signature_algorithm; |
| 1830 | } else if (hs->peer_pubkey->type == EVP_PKEY_RSA) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1831 | signature_algorithm = SSL_SIGN_RSA_PKCS1_MD5_SHA1; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1832 | } else if (hs->peer_pubkey->type == EVP_PKEY_EC) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1833 | signature_algorithm = SSL_SIGN_ECDSA_SHA1; |
| 1834 | } else { |
| 1835 | al = SSL_AD_UNSUPPORTED_CERTIFICATE; |
| 1836 | OPENSSL_PUT_ERROR(SSL, SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE); |
| 1837 | goto f_err; |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 1838 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1839 | |
| 1840 | /* Parse and verify the signature. */ |
| 1841 | if (!CBS_get_u16_length_prefixed(&certificate_verify, &signature) || |
| 1842 | CBS_len(&certificate_verify) != 0) { |
| 1843 | al = SSL_AD_DECODE_ERROR; |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1844 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1845 | goto f_err; |
| 1846 | } |
| 1847 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1848 | int sig_ok; |
| 1849 | /* The SSL3 construction for CertificateVerify does not decompose into a |
| 1850 | * single final digest and signature, and must be special-cased. */ |
| 1851 | if (ssl3_protocol_version(ssl) == SSL3_VERSION) { |
| 1852 | const EVP_MD *md; |
| 1853 | uint8_t digest[EVP_MAX_MD_SIZE]; |
| 1854 | size_t digest_len; |
| 1855 | if (!ssl3_cert_verify_hash(ssl, &md, digest, &digest_len, |
| 1856 | signature_algorithm)) { |
| 1857 | goto err; |
| 1858 | } |
| 1859 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1860 | EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(hs->peer_pubkey, NULL); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1861 | sig_ok = pctx != NULL && |
| 1862 | EVP_PKEY_verify_init(pctx) && |
| 1863 | EVP_PKEY_CTX_set_signature_md(pctx, md) && |
| 1864 | EVP_PKEY_verify(pctx, CBS_data(&signature), CBS_len(&signature), |
| 1865 | digest, digest_len); |
| 1866 | EVP_PKEY_CTX_free(pctx); |
| 1867 | } else { |
| 1868 | sig_ok = ssl_public_key_verify( |
| 1869 | ssl, CBS_data(&signature), CBS_len(&signature), signature_algorithm, |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1870 | hs->peer_pubkey, (const uint8_t *)ssl->s3->handshake_buffer->data, |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1871 | ssl->s3->handshake_buffer->length); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1872 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1873 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 1874 | #if defined(BORINGSSL_UNSAFE_FUZZER_MODE) |
| 1875 | sig_ok = 1; |
| 1876 | ERR_clear_error(); |
| 1877 | #endif |
| 1878 | if (!sig_ok) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1879 | al = SSL_AD_DECRYPT_ERROR; |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1880 | OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_SIGNATURE); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1881 | goto f_err; |
| 1882 | } |
| 1883 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1884 | /* The handshake buffer is no longer necessary, and we may hash the current |
| 1885 | * message.*/ |
| 1886 | ssl3_free_handshake_buffer(ssl); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 1887 | if (!ssl_hash_current_message(ssl)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1888 | goto err; |
| 1889 | } |
| 1890 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1891 | return 1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1892 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1893 | f_err: |
| 1894 | ssl3_send_alert(ssl, SSL3_AL_FATAL, al); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1895 | err: |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1896 | return 0; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1897 | } |
| 1898 | |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1899 | /* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It |
| 1900 | * sets the next_proto member in s if found */ |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1901 | static int ssl3_get_next_proto(SSL_HANDSHAKE *hs) { |
| 1902 | SSL *const ssl = hs->ssl; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1903 | int ret = |
| 1904 | ssl->method->ssl_get_message(ssl, SSL3_MT_NEXT_PROTO, ssl_hash_message); |
| 1905 | if (ret <= 0) { |
| 1906 | return ret; |
| 1907 | } |
| 1908 | |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1909 | CBS next_protocol, selected_protocol, padding; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1910 | CBS_init(&next_protocol, ssl->init_msg, ssl->init_num); |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1911 | if (!CBS_get_u8_length_prefixed(&next_protocol, &selected_protocol) || |
| 1912 | !CBS_get_u8_length_prefixed(&next_protocol, &padding) || |
David Benjamin | 7c0d06c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1913 | CBS_len(&next_protocol) != 0) { |
| 1914 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 1915 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 1916 | return 0; |
| 1917 | } |
| 1918 | |
| 1919 | if (!CBS_stow(&selected_protocol, &ssl->s3->next_proto_negotiated, |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1920 | &ssl->s3->next_proto_negotiated_len)) { |
| 1921 | return 0; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1922 | } |
| 1923 | |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1924 | return 1; |
| 1925 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1926 | |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1927 | /* ssl3_get_channel_id reads and verifies a ClientID handshake message. */ |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1928 | static int ssl3_get_channel_id(SSL_HANDSHAKE *hs) { |
| 1929 | SSL *const ssl = hs->ssl; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1930 | int msg_ret = ssl->method->ssl_get_message(ssl, SSL3_MT_CHANNEL_ID, |
| 1931 | ssl_dont_hash_message); |
| 1932 | if (msg_ret <= 0) { |
| 1933 | return msg_ret; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1934 | } |
| 1935 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 1936 | if (!tls1_verify_channel_id(ssl) || |
| 1937 | !ssl_hash_current_message(ssl)) { |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1938 | return -1; |
| 1939 | } |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 1940 | return 1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1941 | } |
| 1942 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1943 | static int ssl3_send_new_session_ticket(SSL_HANDSHAKE *hs) { |
| 1944 | SSL *const ssl = hs->ssl; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1945 | if (hs->state == SSL3_ST_SW_SESSION_TICKET_B) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1946 | return ssl->method->write_message(ssl); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1947 | } |
| 1948 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 1949 | const SSL_SESSION *session; |
| 1950 | SSL_SESSION *session_copy = NULL; |
| 1951 | if (ssl->session == NULL) { |
| 1952 | /* Fix the timeout to measure from the ticket issuance time. */ |
| 1953 | ssl_session_refresh_time(ssl, ssl->s3->new_session); |
| 1954 | session = ssl->s3->new_session; |
| 1955 | } else { |
| 1956 | /* We are renewing an existing session. Duplicate the session to adjust the |
| 1957 | * timeout. */ |
| 1958 | session_copy = SSL_SESSION_dup(ssl->session, SSL_SESSION_INCLUDE_NONAUTH); |
| 1959 | if (session_copy == NULL) { |
| 1960 | return -1; |
| 1961 | } |
| 1962 | |
| 1963 | ssl_session_refresh_time(ssl, session_copy); |
| 1964 | session = session_copy; |
| 1965 | } |
| 1966 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1967 | CBB cbb, body, ticket; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 1968 | int ok = |
| 1969 | ssl->method->init_message(ssl, &cbb, &body, SSL3_MT_NEW_SESSION_TICKET) && |
| 1970 | CBB_add_u32(&body, session->timeout) && |
| 1971 | CBB_add_u16_length_prefixed(&body, &ticket) && |
| 1972 | ssl_encrypt_ticket(ssl, &ticket, session) && |
| 1973 | ssl_complete_message(ssl, &cbb); |
| 1974 | |
| 1975 | SSL_SESSION_free(session_copy); |
| 1976 | CBB_cleanup(&cbb); |
| 1977 | |
| 1978 | if (!ok) { |
| 1979 | return -1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1980 | } |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 1981 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1982 | hs->state = SSL3_ST_SW_SESSION_TICKET_B; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1983 | return ssl->method->write_message(ssl); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1984 | } |