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> |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 158 | #include <openssl/ec.h> |
| 159 | #include <openssl/ecdsa.h> |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 160 | #include <openssl/err.h> |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 161 | #include <openssl/evp.h> |
| 162 | #include <openssl/hmac.h> |
| 163 | #include <openssl/md5.h> |
| 164 | #include <openssl/mem.h> |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 165 | #include <openssl/nid.h> |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 166 | #include <openssl/rand.h> |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 167 | #include <openssl/x509.h> |
| 168 | |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 169 | #include "internal.h" |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 170 | #include "../crypto/internal.h" |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 171 | |
| 172 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 173 | namespace bssl { |
| 174 | |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 175 | static int ssl3_process_client_hello(SSL_HANDSHAKE *hs); |
| 176 | static int ssl3_select_certificate(SSL_HANDSHAKE *hs); |
| 177 | static int ssl3_select_parameters(SSL_HANDSHAKE *hs); |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 178 | static int ssl3_send_server_hello(SSL_HANDSHAKE *hs); |
| 179 | static int ssl3_send_server_certificate(SSL_HANDSHAKE *hs); |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 180 | static int ssl3_send_server_key_exchange(SSL_HANDSHAKE *hs); |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 181 | static int ssl3_send_server_hello_done(SSL_HANDSHAKE *hs); |
| 182 | static int ssl3_get_client_certificate(SSL_HANDSHAKE *hs); |
| 183 | static int ssl3_get_client_key_exchange(SSL_HANDSHAKE *hs); |
| 184 | static int ssl3_get_cert_verify(SSL_HANDSHAKE *hs); |
| 185 | static int ssl3_get_next_proto(SSL_HANDSHAKE *hs); |
| 186 | static int ssl3_get_channel_id(SSL_HANDSHAKE *hs); |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 187 | static int ssl3_send_server_finished(SSL_HANDSHAKE *hs); |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 188 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 189 | int ssl3_accept(SSL_HANDSHAKE *hs) { |
| 190 | SSL *const ssl = hs->ssl; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 191 | int ret = -1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 192 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 193 | assert(ssl->handshake_func == ssl3_accept); |
| 194 | assert(ssl->server); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 195 | |
| 196 | for (;;) { |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 197 | int state = hs->state; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 198 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 199 | switch (hs->state) { |
David Benjamin | 7c0d06c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 200 | case SSL_ST_INIT: |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 201 | ssl_do_info_callback(ssl, SSL_CB_HANDSHAKE_START, 1); |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 202 | hs->state = SSL3_ST_SR_CLNT_HELLO_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 203 | break; |
| 204 | |
| 205 | case SSL3_ST_SR_CLNT_HELLO_A: |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 206 | ret = ssl->method->ssl_get_message(ssl); |
| 207 | if (ret <= 0) { |
| 208 | goto end; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 209 | } |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 210 | hs->state = SSL3_ST_SR_CLNT_HELLO_B; |
| 211 | break; |
| 212 | |
| 213 | case SSL3_ST_SR_CLNT_HELLO_B: |
| 214 | ret = ssl3_process_client_hello(hs); |
| 215 | if (ret <= 0) { |
| 216 | goto end; |
| 217 | } |
| 218 | hs->state = SSL3_ST_SR_CLNT_HELLO_C; |
| 219 | break; |
| 220 | |
| 221 | case SSL3_ST_SR_CLNT_HELLO_C: |
| 222 | ret = ssl3_select_certificate(hs); |
| 223 | if (ret <= 0) { |
| 224 | goto end; |
| 225 | } |
| 226 | if (hs->state != SSL_ST_TLS13) { |
| 227 | hs->state = SSL3_ST_SR_CLNT_HELLO_D; |
| 228 | } |
| 229 | break; |
| 230 | |
| 231 | case SSL3_ST_SR_CLNT_HELLO_D: |
| 232 | ret = ssl3_select_parameters(hs); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 233 | if (ret <= 0) { |
| 234 | goto end; |
| 235 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 236 | hs->state = SSL3_ST_SW_SRVR_HELLO_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 237 | break; |
| 238 | |
| 239 | case SSL3_ST_SW_SRVR_HELLO_A: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 240 | ret = ssl3_send_server_hello(hs); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 241 | if (ret <= 0) { |
| 242 | goto end; |
| 243 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 244 | if (ssl->session != NULL) { |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 245 | hs->state = SSL3_ST_SW_FINISHED_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 246 | } else { |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 247 | hs->state = SSL3_ST_SW_CERT_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 248 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 249 | break; |
| 250 | |
| 251 | case SSL3_ST_SW_CERT_A: |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 252 | ret = ssl3_send_server_certificate(hs); |
| 253 | if (ret <= 0) { |
| 254 | goto end; |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 255 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 256 | hs->state = SSL3_ST_SW_KEY_EXCH_A; |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 257 | break; |
| 258 | |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 259 | case SSL3_ST_SW_KEY_EXCH_A: |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 260 | if (hs->server_params_len > 0) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 261 | ret = ssl3_send_server_key_exchange(hs); |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 262 | if (ret <= 0) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 263 | goto end; |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 264 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 265 | } |
| 266 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 267 | hs->state = SSL3_ST_SW_SRVR_DONE_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 268 | break; |
| 269 | |
| 270 | case SSL3_ST_SW_SRVR_DONE_A: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 271 | ret = ssl3_send_server_hello_done(hs); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 272 | if (ret <= 0) { |
| 273 | goto end; |
| 274 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 275 | hs->next_state = SSL3_ST_SR_CERT_A; |
| 276 | hs->state = SSL3_ST_SW_FLUSH; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 277 | break; |
| 278 | |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 279 | case SSL3_ST_SR_CERT_A: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 280 | if (hs->cert_request) { |
| 281 | ret = ssl3_get_client_certificate(hs); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 282 | if (ret <= 0) { |
| 283 | goto end; |
| 284 | } |
| 285 | } |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 286 | hs->state = SSL3_ST_VERIFY_CLIENT_CERT; |
| 287 | break; |
| 288 | |
| 289 | case SSL3_ST_VERIFY_CLIENT_CERT: |
| 290 | if (sk_CRYPTO_BUFFER_num(hs->new_session->certs) > 0) { |
| 291 | switch (ssl_verify_peer_cert(hs)) { |
| 292 | case ssl_verify_ok: |
| 293 | break; |
| 294 | case ssl_verify_invalid: |
| 295 | ret = -1; |
| 296 | goto end; |
| 297 | case ssl_verify_retry: |
| 298 | ssl->rwstate = SSL_CERTIFICATE_VERIFY; |
| 299 | ret = -1; |
| 300 | goto end; |
| 301 | } |
| 302 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 303 | hs->state = SSL3_ST_SR_KEY_EXCH_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 304 | break; |
| 305 | |
| 306 | case SSL3_ST_SR_KEY_EXCH_A: |
| 307 | case SSL3_ST_SR_KEY_EXCH_B: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 308 | ret = ssl3_get_client_key_exchange(hs); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 309 | if (ret <= 0) { |
| 310 | goto end; |
| 311 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 312 | hs->state = SSL3_ST_SR_CERT_VRFY_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 313 | break; |
| 314 | |
| 315 | case SSL3_ST_SR_CERT_VRFY_A: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 316 | ret = ssl3_get_cert_verify(hs); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 317 | if (ret <= 0) { |
| 318 | goto end; |
| 319 | } |
| 320 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 321 | hs->state = SSL3_ST_SR_CHANGE; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 322 | break; |
| 323 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 324 | case SSL3_ST_SR_CHANGE: |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 325 | ret = ssl->method->read_change_cipher_spec(ssl); |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 326 | if (ret <= 0) { |
| 327 | goto end; |
| 328 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 329 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 330 | if (!tls1_change_cipher_state(hs, SSL3_CHANGE_CIPHER_SERVER_READ)) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 331 | ret = -1; |
| 332 | goto end; |
| 333 | } |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 334 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 335 | hs->state = SSL3_ST_SR_NEXT_PROTO_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 336 | break; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 337 | |
| 338 | case SSL3_ST_SR_NEXT_PROTO_A: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 339 | if (hs->next_proto_neg_seen) { |
| 340 | ret = ssl3_get_next_proto(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 341 | if (ret <= 0) { |
| 342 | goto end; |
| 343 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 344 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 345 | hs->state = SSL3_ST_SR_CHANNEL_ID_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 346 | break; |
| 347 | |
| 348 | case SSL3_ST_SR_CHANNEL_ID_A: |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 349 | if (ssl->s3->tlsext_channel_id_valid) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 350 | ret = ssl3_get_channel_id(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 351 | if (ret <= 0) { |
| 352 | goto end; |
| 353 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 354 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 355 | hs->state = SSL3_ST_SR_FINISHED_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 356 | break; |
| 357 | |
| 358 | case SSL3_ST_SR_FINISHED_A: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 359 | ret = ssl3_get_finished(hs); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 360 | if (ret <= 0) { |
| 361 | goto end; |
| 362 | } |
| 363 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 364 | if (ssl->session != NULL) { |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 365 | hs->state = SSL_ST_OK; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 366 | } else { |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 367 | hs->state = SSL3_ST_SW_FINISHED_A; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 368 | } |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 369 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 370 | /* If this is a full handshake with ChannelID then record the handshake |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 371 | * hashes in |hs->new_session| in case we need them to verify a |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 372 | * ChannelID signature on a resumption of this session in the future. */ |
| 373 | if (ssl->session == NULL && ssl->s3->tlsext_channel_id_valid) { |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 374 | ret = tls1_record_handshake_hashes_for_channel_id(hs); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 375 | if (ret <= 0) { |
| 376 | goto end; |
| 377 | } |
| 378 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 379 | break; |
| 380 | |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 381 | case SSL3_ST_SW_FINISHED_A: |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 382 | ret = ssl3_send_server_finished(hs); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 383 | if (ret <= 0) { |
| 384 | goto end; |
| 385 | } |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 386 | hs->state = SSL3_ST_SW_FLUSH; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 387 | if (ssl->session != NULL) { |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 388 | hs->next_state = SSL3_ST_SR_CHANGE; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 389 | } else { |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 390 | hs->next_state = SSL_ST_OK; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 391 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 392 | break; |
| 393 | |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 394 | case SSL3_ST_SW_FLUSH: |
David Benjamin | f31229b | 2017-01-25 14:08:15 -0500 | [diff] [blame] | 395 | ret = ssl->method->flush_flight(ssl); |
| 396 | if (ret <= 0) { |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 397 | goto end; |
| 398 | } |
| 399 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 400 | hs->state = hs->next_state; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 401 | break; |
| 402 | |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 403 | case SSL_ST_TLS13: { |
| 404 | int early_return = 0; |
| 405 | ret = tls13_handshake(hs, &early_return); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 406 | if (ret <= 0) { |
| 407 | goto end; |
| 408 | } |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 409 | |
| 410 | if (early_return) { |
| 411 | ret = 1; |
| 412 | goto end; |
| 413 | } |
| 414 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 415 | hs->state = SSL_ST_OK; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 416 | break; |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 417 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 418 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 419 | case SSL_ST_OK: |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 420 | ssl->method->on_handshake_complete(ssl); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 421 | ssl->method->release_current_message(ssl, 1 /* free_buffer */); |
| 422 | |
| 423 | /* If we aren't retaining peer certificates then we can discard it |
| 424 | * now. */ |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 425 | if (hs->new_session != NULL && |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 426 | ssl->retain_only_sha256_of_client_certs) { |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 427 | sk_CRYPTO_BUFFER_pop_free(hs->new_session->certs, CRYPTO_BUFFER_free); |
| 428 | hs->new_session->certs = NULL; |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 429 | ssl->ctx->x509_method->session_clear(hs->new_session.get()); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 430 | } |
| 431 | |
| 432 | SSL_SESSION_free(ssl->s3->established_session); |
| 433 | if (ssl->session != NULL) { |
| 434 | SSL_SESSION_up_ref(ssl->session); |
| 435 | ssl->s3->established_session = ssl->session; |
| 436 | } else { |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 437 | ssl->s3->established_session = hs->new_session.release(); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 438 | ssl->s3->established_session->not_resumable = 0; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 439 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 440 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 441 | ssl->s3->initial_handshake_complete = 1; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 442 | ssl_update_cache(hs, SSL_SESS_CACHE_SERVER); |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 443 | |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 444 | ssl_do_info_callback(ssl, SSL_CB_HANDSHAKE_DONE, 1); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 445 | ret = 1; |
| 446 | goto end; |
| 447 | |
| 448 | default: |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 449 | OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_STATE); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 450 | ret = -1; |
| 451 | goto end; |
| 452 | } |
| 453 | |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 454 | if (hs->state != state) { |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 455 | ssl_do_info_callback(ssl, SSL_CB_ACCEPT_LOOP, 1); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 456 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 457 | } |
| 458 | |
| 459 | end: |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 460 | ssl_do_info_callback(ssl, SSL_CB_ACCEPT_EXIT, ret); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 461 | return ret; |
| 462 | } |
| 463 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 464 | int ssl_client_cipher_list_contains_cipher(const SSL_CLIENT_HELLO *client_hello, |
| 465 | uint16_t id) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 466 | CBS cipher_suites; |
| 467 | CBS_init(&cipher_suites, client_hello->cipher_suites, |
| 468 | client_hello->cipher_suites_len); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 469 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 470 | while (CBS_len(&cipher_suites) > 0) { |
| 471 | uint16_t got_id; |
| 472 | if (!CBS_get_u16(&cipher_suites, &got_id)) { |
| 473 | return 0; |
| 474 | } |
| 475 | |
| 476 | if (got_id == id) { |
| 477 | return 1; |
| 478 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 479 | } |
| 480 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 481 | return 0; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 482 | } |
| 483 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 484 | static int negotiate_version(SSL_HANDSHAKE *hs, uint8_t *out_alert, |
| 485 | const SSL_CLIENT_HELLO *client_hello) { |
| 486 | SSL *const ssl = hs->ssl; |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 487 | assert(!ssl->s3->have_version); |
Robert Sloan | f6200e7 | 2017-07-10 08:09:18 -0700 | [diff] [blame] | 488 | CBS supported_versions, versions; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 489 | if (ssl_client_hello_get_extension(client_hello, &supported_versions, |
| 490 | TLSEXT_TYPE_supported_versions)) { |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 491 | if (!CBS_get_u8_length_prefixed(&supported_versions, &versions) || |
| 492 | CBS_len(&supported_versions) != 0 || |
| 493 | CBS_len(&versions) == 0) { |
| 494 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 495 | *out_alert = SSL_AD_DECODE_ERROR; |
| 496 | return 0; |
| 497 | } |
David Benjamin | 7c0d06c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 498 | } else { |
Robert Sloan | f6200e7 | 2017-07-10 08:09:18 -0700 | [diff] [blame] | 499 | /* Convert the ClientHello version to an equivalent supported_versions |
| 500 | * extension. */ |
| 501 | static const uint8_t kTLSVersions[] = { |
| 502 | 0x03, 0x03, /* TLS 1.2 */ |
| 503 | 0x03, 0x02, /* TLS 1.1 */ |
| 504 | 0x03, 0x01, /* TLS 1 */ |
| 505 | 0x03, 0x00, /* SSL 3 */ |
| 506 | }; |
| 507 | |
| 508 | static const uint8_t kDTLSVersions[] = { |
| 509 | 0xfe, 0xfd, /* DTLS 1.2 */ |
| 510 | 0xfe, 0xff, /* DTLS 1.0 */ |
| 511 | }; |
| 512 | |
| 513 | size_t versions_len = 0; |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 514 | if (SSL_is_dtls(ssl)) { |
| 515 | if (client_hello->version <= DTLS1_2_VERSION) { |
Robert Sloan | f6200e7 | 2017-07-10 08:09:18 -0700 | [diff] [blame] | 516 | versions_len = 4; |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 517 | } else if (client_hello->version <= DTLS1_VERSION) { |
Robert Sloan | f6200e7 | 2017-07-10 08:09:18 -0700 | [diff] [blame] | 518 | versions_len = 2; |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 519 | } |
Robert Sloan | f6200e7 | 2017-07-10 08:09:18 -0700 | [diff] [blame] | 520 | CBS_init(&versions, kDTLSVersions + sizeof(kDTLSVersions) - versions_len, |
| 521 | versions_len); |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 522 | } else { |
| 523 | if (client_hello->version >= TLS1_2_VERSION) { |
Robert Sloan | f6200e7 | 2017-07-10 08:09:18 -0700 | [diff] [blame] | 524 | versions_len = 8; |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 525 | } else if (client_hello->version >= TLS1_1_VERSION) { |
Robert Sloan | f6200e7 | 2017-07-10 08:09:18 -0700 | [diff] [blame] | 526 | versions_len = 6; |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 527 | } else if (client_hello->version >= TLS1_VERSION) { |
Robert Sloan | f6200e7 | 2017-07-10 08:09:18 -0700 | [diff] [blame] | 528 | versions_len = 4; |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 529 | } else if (client_hello->version >= SSL3_VERSION) { |
Robert Sloan | f6200e7 | 2017-07-10 08:09:18 -0700 | [diff] [blame] | 530 | versions_len = 2; |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 531 | } |
Robert Sloan | f6200e7 | 2017-07-10 08:09:18 -0700 | [diff] [blame] | 532 | CBS_init(&versions, kTLSVersions + sizeof(kTLSVersions) - versions_len, |
| 533 | versions_len); |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 534 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 535 | } |
| 536 | |
Robert Sloan | f6200e7 | 2017-07-10 08:09:18 -0700 | [diff] [blame] | 537 | if (!ssl_negotiate_version(hs, out_alert, &ssl->version, &versions)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 538 | return 0; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 539 | } |
| 540 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 541 | /* At this point, the connection's version is known and |ssl->version| is |
| 542 | * fixed. Begin enforcing the record-layer version. */ |
| 543 | ssl->s3->have_version = 1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 544 | |
Robert Sloan | f6200e7 | 2017-07-10 08:09:18 -0700 | [diff] [blame] | 545 | /* Handle FALLBACK_SCSV. */ |
| 546 | if (ssl_client_cipher_list_contains_cipher(client_hello, |
| 547 | SSL3_CK_FALLBACK_SCSV & 0xffff) && |
| 548 | ssl3_protocol_version(ssl) < hs->max_version) { |
| 549 | OPENSSL_PUT_ERROR(SSL, SSL_R_INAPPROPRIATE_FALLBACK); |
| 550 | *out_alert = SSL3_AD_INAPPROPRIATE_FALLBACK; |
| 551 | return 0; |
| 552 | } |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 553 | |
Robert Sloan | f6200e7 | 2017-07-10 08:09:18 -0700 | [diff] [blame] | 554 | return 1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 555 | } |
| 556 | |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 557 | static UniquePtr<STACK_OF(SSL_CIPHER)> ssl_parse_client_cipher_list( |
| 558 | const SSL_CLIENT_HELLO *client_hello) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 559 | CBS cipher_suites; |
| 560 | CBS_init(&cipher_suites, client_hello->cipher_suites, |
| 561 | client_hello->cipher_suites_len); |
| 562 | |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 563 | UniquePtr<STACK_OF(SSL_CIPHER)> sk(sk_SSL_CIPHER_new_null()); |
| 564 | if (!sk) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 565 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 566 | return nullptr; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 567 | } |
| 568 | |
| 569 | while (CBS_len(&cipher_suites) > 0) { |
| 570 | uint16_t cipher_suite; |
| 571 | |
| 572 | if (!CBS_get_u16(&cipher_suites, &cipher_suite)) { |
| 573 | OPENSSL_PUT_ERROR(SSL, SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST); |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 574 | return nullptr; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 575 | } |
| 576 | |
| 577 | const SSL_CIPHER *c = SSL_get_cipher_by_value(cipher_suite); |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 578 | if (c != NULL && !sk_SSL_CIPHER_push(sk.get(), c)) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 579 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 580 | return nullptr; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 581 | } |
| 582 | } |
| 583 | |
| 584 | return sk; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 585 | } |
| 586 | |
| 587 | /* ssl_get_compatible_server_ciphers determines the key exchange and |
| 588 | * authentication cipher suite masks compatible with the server configuration |
| 589 | * and current ClientHello parameters of |hs|. It sets |*out_mask_k| to the key |
| 590 | * exchange mask and |*out_mask_a| to the authentication mask. */ |
| 591 | static void ssl_get_compatible_server_ciphers(SSL_HANDSHAKE *hs, |
| 592 | uint32_t *out_mask_k, |
| 593 | uint32_t *out_mask_a) { |
| 594 | SSL *const ssl = hs->ssl; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 595 | uint32_t mask_k = 0; |
| 596 | uint32_t mask_a = 0; |
| 597 | |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 598 | if (ssl_has_certificate(ssl)) { |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 599 | mask_a |= ssl_cipher_auth_mask_for_key(hs->local_pubkey.get()); |
| 600 | if (EVP_PKEY_id(hs->local_pubkey.get()) == EVP_PKEY_RSA) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 601 | mask_k |= SSL_kRSA; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 602 | } |
| 603 | } |
| 604 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 605 | /* Check for a shared group to consider ECDHE ciphers. */ |
| 606 | uint16_t unused; |
| 607 | if (tls1_get_shared_group(hs, &unused)) { |
| 608 | mask_k |= SSL_kECDHE; |
| 609 | } |
| 610 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 611 | /* PSK requires a server callback. */ |
| 612 | if (ssl->psk_server_callback != NULL) { |
| 613 | mask_k |= SSL_kPSK; |
| 614 | mask_a |= SSL_aPSK; |
| 615 | } |
| 616 | |
| 617 | *out_mask_k = mask_k; |
| 618 | *out_mask_a = mask_a; |
| 619 | } |
| 620 | |
| 621 | static const SSL_CIPHER *ssl3_choose_cipher( |
| 622 | SSL_HANDSHAKE *hs, const SSL_CLIENT_HELLO *client_hello, |
| 623 | const struct ssl_cipher_preference_list_st *server_pref) { |
| 624 | SSL *const ssl = hs->ssl; |
Robert Sloan | 6f79a50 | 2017-04-03 09:16:40 -0700 | [diff] [blame] | 625 | STACK_OF(SSL_CIPHER) *prio, *allow; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 626 | /* in_group_flags will either be NULL, or will point to an array of bytes |
| 627 | * which indicate equal-preference groups in the |prio| stack. See the |
| 628 | * comment about |in_group_flags| in the |ssl_cipher_preference_list_st| |
| 629 | * struct. */ |
| 630 | const uint8_t *in_group_flags; |
| 631 | /* group_min contains the minimal index so far found in a group, or -1 if no |
| 632 | * such value exists yet. */ |
| 633 | int group_min = -1; |
| 634 | |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 635 | UniquePtr<STACK_OF(SSL_CIPHER)> client_pref = |
Robert Sloan | 6f79a50 | 2017-04-03 09:16:40 -0700 | [diff] [blame] | 636 | ssl_parse_client_cipher_list(client_hello); |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 637 | if (!client_pref) { |
| 638 | return nullptr; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 639 | } |
| 640 | |
| 641 | if (ssl->options & SSL_OP_CIPHER_SERVER_PREFERENCE) { |
Robert Sloan | 6f79a50 | 2017-04-03 09:16:40 -0700 | [diff] [blame] | 642 | prio = server_pref->ciphers; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 643 | in_group_flags = server_pref->in_group_flags; |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 644 | allow = client_pref.get(); |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 645 | } else { |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 646 | prio = client_pref.get(); |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 647 | in_group_flags = NULL; |
Robert Sloan | 6f79a50 | 2017-04-03 09:16:40 -0700 | [diff] [blame] | 648 | allow = server_pref->ciphers; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 649 | } |
| 650 | |
Robert Sloan | 6f79a50 | 2017-04-03 09:16:40 -0700 | [diff] [blame] | 651 | uint32_t mask_k, mask_a; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 652 | ssl_get_compatible_server_ciphers(hs, &mask_k, &mask_a); |
| 653 | |
| 654 | for (size_t i = 0; i < sk_SSL_CIPHER_num(prio); i++) { |
Robert Sloan | 6f79a50 | 2017-04-03 09:16:40 -0700 | [diff] [blame] | 655 | const SSL_CIPHER *c = sk_SSL_CIPHER_value(prio, i); |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 656 | |
Robert Sloan | 6f79a50 | 2017-04-03 09:16:40 -0700 | [diff] [blame] | 657 | size_t cipher_index; |
| 658 | if (/* Check if the cipher is supported for the current version. */ |
| 659 | SSL_CIPHER_get_min_version(c) <= ssl3_protocol_version(ssl) && |
| 660 | ssl3_protocol_version(ssl) <= SSL_CIPHER_get_max_version(c) && |
| 661 | /* Check the cipher is supported for the server configuration. */ |
| 662 | (c->algorithm_mkey & mask_k) && |
| 663 | (c->algorithm_auth & mask_a) && |
| 664 | /* Check the cipher is in the |allow| list. */ |
| 665 | sk_SSL_CIPHER_find(allow, &cipher_index, c)) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 666 | if (in_group_flags != NULL && in_group_flags[i] == 1) { |
| 667 | /* This element of |prio| is in a group. Update the minimum index found |
| 668 | * so far and continue looking. */ |
| 669 | if (group_min == -1 || (size_t)group_min > cipher_index) { |
| 670 | group_min = cipher_index; |
| 671 | } |
| 672 | } else { |
| 673 | if (group_min != -1 && (size_t)group_min < cipher_index) { |
| 674 | cipher_index = group_min; |
| 675 | } |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 676 | return sk_SSL_CIPHER_value(allow, cipher_index); |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 677 | } |
| 678 | } |
| 679 | |
| 680 | if (in_group_flags != NULL && in_group_flags[i] == 0 && group_min != -1) { |
| 681 | /* We are about to leave a group, but we found a match in it, so that's |
| 682 | * our answer. */ |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 683 | return sk_SSL_CIPHER_value(allow, group_min); |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 684 | } |
| 685 | } |
| 686 | |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 687 | return nullptr; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 688 | } |
| 689 | |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 690 | static int ssl3_process_client_hello(SSL_HANDSHAKE *hs) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 691 | SSL *const ssl = hs->ssl; |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 692 | if (!ssl_check_message_type(ssl, SSL3_MT_CLIENT_HELLO)) { |
| 693 | return -1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 694 | } |
| 695 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 696 | SSL_CLIENT_HELLO client_hello; |
| 697 | if (!ssl_client_hello_init(ssl, &client_hello, ssl->init_msg, |
| 698 | ssl->init_num)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 699 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 700 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 701 | return -1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 702 | } |
| 703 | |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 704 | /* Run the early callback. */ |
| 705 | if (ssl->ctx->select_certificate_cb != NULL) { |
| 706 | switch (ssl->ctx->select_certificate_cb(&client_hello)) { |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 707 | case ssl_select_cert_retry: |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 708 | ssl->rwstate = SSL_CERTIFICATE_SELECTION_PENDING; |
| 709 | return -1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 710 | |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 711 | case ssl_select_cert_error: |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 712 | /* Connection rejected. */ |
| 713 | OPENSSL_PUT_ERROR(SSL, SSL_R_CONNECTION_REJECTED); |
| 714 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); |
| 715 | return -1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 716 | |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 717 | default: |
| 718 | /* fallthrough */; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 719 | } |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 720 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 721 | |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 722 | /* Freeze the version range after the early callback. */ |
| 723 | if (!ssl_get_version_range(ssl, &hs->min_version, &hs->max_version)) { |
| 724 | return -1; |
| 725 | } |
| 726 | |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 727 | uint8_t alert = SSL_AD_DECODE_ERROR; |
| 728 | if (!negotiate_version(hs, &alert, &client_hello)) { |
| 729 | ssl3_send_alert(ssl, SSL3_AL_FATAL, alert); |
| 730 | return -1; |
| 731 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 732 | |
Robert Sloan | f6200e7 | 2017-07-10 08:09:18 -0700 | [diff] [blame] | 733 | hs->client_version = client_hello.version; |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 734 | if (client_hello.random_len != SSL3_RANDOM_SIZE) { |
| 735 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| 736 | return -1; |
| 737 | } |
| 738 | OPENSSL_memcpy(ssl->s3->client_random, client_hello.random, |
| 739 | client_hello.random_len); |
| 740 | |
| 741 | /* Only null compression is supported. TLS 1.3 further requires the peer |
| 742 | * advertise no other compression. */ |
| 743 | if (OPENSSL_memchr(client_hello.compression_methods, 0, |
| 744 | client_hello.compression_methods_len) == NULL || |
| 745 | (ssl3_protocol_version(ssl) >= TLS1_3_VERSION && |
| 746 | client_hello.compression_methods_len != 1)) { |
| 747 | OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_COMPRESSION_LIST); |
| 748 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); |
| 749 | return -1; |
| 750 | } |
| 751 | |
| 752 | /* TLS extensions. */ |
| 753 | if (!ssl_parse_clienthello_tlsext(hs, &client_hello)) { |
| 754 | OPENSSL_PUT_ERROR(SSL, SSL_R_PARSE_TLSEXT); |
| 755 | return -1; |
| 756 | } |
| 757 | |
| 758 | return 1; |
| 759 | } |
| 760 | |
| 761 | static int ssl3_select_certificate(SSL_HANDSHAKE *hs) { |
| 762 | SSL *const ssl = hs->ssl; |
| 763 | /* Call |cert_cb| to update server certificates if required. */ |
| 764 | if (ssl->cert->cert_cb != NULL) { |
| 765 | int rv = ssl->cert->cert_cb(ssl, ssl->cert->cert_cb_arg); |
| 766 | if (rv == 0) { |
| 767 | OPENSSL_PUT_ERROR(SSL, SSL_R_CERT_CB_ERROR); |
| 768 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 769 | return -1; |
| 770 | } |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 771 | if (rv < 0) { |
| 772 | ssl->rwstate = SSL_X509_LOOKUP; |
| 773 | return -1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 774 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 775 | } |
| 776 | |
Robert Sloan | 572a4e2 | 2017-04-17 10:52:19 -0700 | [diff] [blame] | 777 | if (!ssl_on_certificate_selected(hs)) { |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 778 | return -1; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 779 | } |
| 780 | |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 781 | if (ssl3_protocol_version(ssl) >= TLS1_3_VERSION) { |
| 782 | /* Jump to the TLS 1.3 state machine. */ |
| 783 | hs->state = SSL_ST_TLS13; |
| 784 | hs->do_tls13_handshake = tls13_server_handshake; |
| 785 | return 1; |
| 786 | } |
| 787 | |
| 788 | SSL_CLIENT_HELLO client_hello; |
| 789 | if (!ssl_client_hello_init(ssl, &client_hello, ssl->init_msg, |
| 790 | ssl->init_num)) { |
| 791 | return -1; |
| 792 | } |
| 793 | |
| 794 | /* Negotiate the cipher suite. This must be done after |cert_cb| so the |
| 795 | * certificate is finalized. */ |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 796 | hs->new_cipher = |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 797 | ssl3_choose_cipher(hs, &client_hello, ssl_get_cipher_preferences(ssl)); |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 798 | if (hs->new_cipher == NULL) { |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 799 | OPENSSL_PUT_ERROR(SSL, SSL_R_NO_SHARED_CIPHER); |
| 800 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); |
| 801 | return -1; |
| 802 | } |
| 803 | |
| 804 | return 1; |
| 805 | } |
| 806 | |
| 807 | static int ssl3_select_parameters(SSL_HANDSHAKE *hs) { |
| 808 | SSL *const ssl = hs->ssl; |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 809 | SSL_CLIENT_HELLO client_hello; |
| 810 | if (!ssl_client_hello_init(ssl, &client_hello, ssl->init_msg, |
| 811 | ssl->init_num)) { |
| 812 | return -1; |
| 813 | } |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 814 | |
| 815 | /* Determine whether we are doing session resumption. */ |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 816 | UniquePtr<SSL_SESSION> session; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 817 | int tickets_supported = 0, renew_ticket = 0; |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 818 | switch (ssl_get_prev_session(ssl, &session, &tickets_supported, &renew_ticket, |
| 819 | &client_hello)) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 820 | case ssl_session_success: |
| 821 | break; |
| 822 | case ssl_session_error: |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 823 | return -1; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 824 | case ssl_session_retry: |
| 825 | ssl->rwstate = SSL_PENDING_SESSION; |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 826 | return -1; |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 827 | case ssl_session_ticket_retry: |
| 828 | ssl->rwstate = SSL_PENDING_TICKET; |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 829 | return -1; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 830 | } |
| 831 | |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 832 | if (session) { |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 833 | if (session->extended_master_secret && !hs->extended_master_secret) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 834 | /* A ClientHello without EMS that attempts to resume a session with EMS |
| 835 | * is fatal to the connection. */ |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 836 | OPENSSL_PUT_ERROR(SSL, SSL_R_RESUMED_EMS_SESSION_WITHOUT_EMS_EXTENSION); |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 837 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 838 | return -1; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 839 | } |
| 840 | |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 841 | if (!ssl_session_is_resumable(hs, session.get()) || |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 842 | /* If the client offers the EMS extension, but the previous session |
| 843 | * didn't use it, then negotiate a new session. */ |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 844 | hs->extended_master_secret != session->extended_master_secret) { |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 845 | session.reset(); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 846 | } |
| 847 | } |
| 848 | |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 849 | if (session) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 850 | /* Use the old session. */ |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 851 | hs->ticket_expected = renew_ticket; |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 852 | ssl->session = session.release(); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 853 | ssl->s3->session_reused = 1; |
| 854 | } else { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 855 | hs->ticket_expected = tickets_supported; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 856 | ssl_set_session(ssl, NULL); |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 857 | if (!ssl_get_new_session(hs, 1 /* server */)) { |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 858 | return -1; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 859 | } |
| 860 | |
| 861 | /* Clear the session ID if we want the session to be single-use. */ |
| 862 | if (!(ssl->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)) { |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 863 | hs->new_session->session_id_length = 0; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 864 | } |
| 865 | } |
| 866 | |
| 867 | if (ssl->ctx->dos_protection_cb != NULL && |
| 868 | ssl->ctx->dos_protection_cb(&client_hello) == 0) { |
| 869 | /* Connection rejected for DOS reasons. */ |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 870 | OPENSSL_PUT_ERROR(SSL, SSL_R_CONNECTION_REJECTED); |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 871 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 872 | return -1; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 873 | } |
| 874 | |
| 875 | if (ssl->session == NULL) { |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 876 | hs->new_session->cipher = hs->new_cipher; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 877 | |
| 878 | /* On new sessions, stash the SNI value in the session. */ |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 879 | if (hs->hostname != NULL) { |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 880 | OPENSSL_free(hs->new_session->tlsext_hostname); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 881 | hs->new_session->tlsext_hostname = BUF_strdup(hs->hostname.get()); |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 882 | if (hs->new_session->tlsext_hostname == NULL) { |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 883 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 884 | return -1; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 885 | } |
| 886 | } |
Adam Langley | f4e4272 | 2015-06-04 17:45:09 -0700 | [diff] [blame] | 887 | |
| 888 | /* Determine whether to request a client certificate. */ |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 889 | hs->cert_request = !!(ssl->verify_mode & SSL_VERIFY_PEER); |
Adam Langley | f4e4272 | 2015-06-04 17:45:09 -0700 | [diff] [blame] | 890 | /* Only request a certificate if Channel ID isn't negotiated. */ |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 891 | if ((ssl->verify_mode & SSL_VERIFY_PEER_IF_NO_OBC) && |
| 892 | ssl->s3->tlsext_channel_id_valid) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 893 | hs->cert_request = 0; |
Adam Langley | f4e4272 | 2015-06-04 17:45:09 -0700 | [diff] [blame] | 894 | } |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 895 | /* CertificateRequest may only be sent in certificate-based ciphers. */ |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 896 | if (!ssl_cipher_uses_certificate_auth(hs->new_cipher)) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 897 | hs->cert_request = 0; |
Adam Langley | f4e4272 | 2015-06-04 17:45:09 -0700 | [diff] [blame] | 898 | } |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 899 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 900 | if (!hs->cert_request) { |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 901 | /* OpenSSL returns X509_V_OK when no certificates are requested. This is |
| 902 | * classed by them as a bug, but it's assumed by at least NGINX. */ |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 903 | hs->new_session->verify_result = X509_V_OK; |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 904 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 905 | } |
| 906 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 907 | /* HTTP/2 negotiation depends on the cipher suite, so ALPN negotiation was |
| 908 | * deferred. Complete it now. */ |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 909 | uint8_t alert = SSL_AD_DECODE_ERROR; |
| 910 | if (!ssl_negotiate_alpn(hs, &alert, &client_hello)) { |
| 911 | ssl3_send_alert(ssl, SSL3_AL_FATAL, alert); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 912 | return -1; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 913 | } |
| 914 | |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 915 | /* Now that all parameters are known, initialize the handshake hash and hash |
| 916 | * the ClientHello. */ |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 917 | if (!hs->transcript.InitHash(ssl3_protocol_version(ssl), |
| 918 | hs->new_cipher->algorithm_prf) || |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 919 | !ssl_hash_current_message(hs)) { |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 920 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 921 | return -1; |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 922 | } |
| 923 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 924 | /* Release the handshake buffer if client authentication isn't required. */ |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 925 | if (!hs->cert_request) { |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 926 | hs->transcript.FreeBuffer(); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 927 | } |
| 928 | |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 929 | return 1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 930 | } |
| 931 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 932 | static int ssl3_send_server_hello(SSL_HANDSHAKE *hs) { |
| 933 | SSL *const ssl = hs->ssl; |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 934 | |
| 935 | /* We only accept ChannelIDs on connections with ECDHE in order to avoid a |
| 936 | * known attack while we fix ChannelID itself. */ |
| 937 | if (ssl->s3->tlsext_channel_id_valid && |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 938 | (hs->new_cipher->algorithm_mkey & SSL_kECDHE) == 0) { |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 939 | ssl->s3->tlsext_channel_id_valid = 0; |
| 940 | } |
| 941 | |
| 942 | /* If this is a resumption and the original handshake didn't support |
| 943 | * ChannelID then we didn't record the original handshake hashes in the |
| 944 | * session and so cannot resume with ChannelIDs. */ |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 945 | if (ssl->session != NULL && |
| 946 | ssl->session->original_handshake_hash_len == 0) { |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 947 | ssl->s3->tlsext_channel_id_valid = 0; |
| 948 | } |
| 949 | |
Robert Sloan | 7d422bc | 2017-03-06 10:04:29 -0800 | [diff] [blame] | 950 | struct OPENSSL_timeval now; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 951 | ssl_get_current_time(ssl, &now); |
| 952 | ssl->s3->server_random[0] = now.tv_sec >> 24; |
| 953 | ssl->s3->server_random[1] = now.tv_sec >> 16; |
| 954 | ssl->s3->server_random[2] = now.tv_sec >> 8; |
| 955 | ssl->s3->server_random[3] = now.tv_sec; |
| 956 | if (!RAND_bytes(ssl->s3->server_random + 4, SSL3_RANDOM_SIZE - 4)) { |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 957 | return -1; |
| 958 | } |
| 959 | |
David Benjamin | 7c0d06c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 960 | /* TODO(davidben): Implement the TLS 1.1 and 1.2 downgrade sentinels once TLS |
| 961 | * 1.3 is finalized and we are not implementing a draft version. */ |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 962 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 963 | const SSL_SESSION *session = hs->new_session.get(); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 964 | if (ssl->session != NULL) { |
| 965 | session = ssl->session; |
| 966 | } |
| 967 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 968 | ScopedCBB cbb; |
| 969 | CBB body, session_id; |
| 970 | if (!ssl->method->init_message(ssl, cbb.get(), &body, SSL3_MT_SERVER_HELLO) || |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 971 | !CBB_add_u16(&body, ssl->version) || |
| 972 | !CBB_add_bytes(&body, ssl->s3->server_random, SSL3_RANDOM_SIZE) || |
| 973 | !CBB_add_u8_length_prefixed(&body, &session_id) || |
| 974 | !CBB_add_bytes(&session_id, session->session_id, |
| 975 | session->session_id_length) || |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 976 | !CBB_add_u16(&body, ssl_cipher_get_value(hs->new_cipher)) || |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 977 | !CBB_add_u8(&body, 0 /* no compression */) || |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 978 | !ssl_add_serverhello_tlsext(hs, &body) || |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 979 | !ssl_add_message_cbb(ssl, cbb.get())) { |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 980 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 981 | return -1; |
| 982 | } |
| 983 | |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 984 | return 1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 985 | } |
| 986 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 987 | static int ssl3_send_server_certificate(SSL_HANDSHAKE *hs) { |
| 988 | SSL *const ssl = hs->ssl; |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 989 | ScopedCBB cbb; |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 990 | |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 991 | if (ssl_cipher_uses_certificate_auth(hs->new_cipher)) { |
| 992 | if (!ssl_has_certificate(ssl)) { |
| 993 | OPENSSL_PUT_ERROR(SSL, SSL_R_NO_CERTIFICATE_SET); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 994 | return -1; |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 995 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 996 | |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 997 | if (!ssl3_output_cert_chain(ssl)) { |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 998 | return -1; |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 999 | } |
| 1000 | |
| 1001 | if (hs->certificate_status_expected) { |
| 1002 | CBB body, ocsp_response; |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 1003 | if (!ssl->method->init_message(ssl, cbb.get(), &body, |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1004 | SSL3_MT_CERTIFICATE_STATUS) || |
| 1005 | !CBB_add_u8(&body, TLSEXT_STATUSTYPE_ocsp) || |
| 1006 | !CBB_add_u24_length_prefixed(&body, &ocsp_response) || |
| 1007 | !CBB_add_bytes(&ocsp_response, |
| 1008 | CRYPTO_BUFFER_data(ssl->cert->ocsp_response), |
| 1009 | CRYPTO_BUFFER_len(ssl->cert->ocsp_response)) || |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 1010 | !ssl_add_message_cbb(ssl, cbb.get())) { |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1011 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 1012 | return -1; |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1013 | } |
| 1014 | } |
| 1015 | } |
| 1016 | |
| 1017 | /* Assemble ServerKeyExchange parameters if needed. */ |
| 1018 | uint32_t alg_k = hs->new_cipher->algorithm_mkey; |
| 1019 | uint32_t alg_a = hs->new_cipher->algorithm_auth; |
| 1020 | if (ssl_cipher_requires_server_key_exchange(hs->new_cipher) || |
| 1021 | ((alg_a & SSL_aPSK) && ssl->psk_identity_hint)) { |
| 1022 | |
| 1023 | /* Pre-allocate enough room to comfortably fit an ECDHE public key. Prepend |
| 1024 | * the client and server randoms for the signing transcript. */ |
| 1025 | CBB child; |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 1026 | if (!CBB_init(cbb.get(), SSL3_RANDOM_SIZE * 2 + 128) || |
| 1027 | !CBB_add_bytes(cbb.get(), ssl->s3->client_random, SSL3_RANDOM_SIZE) || |
| 1028 | !CBB_add_bytes(cbb.get(), ssl->s3->server_random, SSL3_RANDOM_SIZE)) { |
| 1029 | return -1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1030 | } |
| 1031 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1032 | /* PSK ciphers begin with an identity hint. */ |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1033 | if (alg_a & SSL_aPSK) { |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1034 | size_t len = |
| 1035 | (ssl->psk_identity_hint == NULL) ? 0 : strlen(ssl->psk_identity_hint); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 1036 | if (!CBB_add_u16_length_prefixed(cbb.get(), &child) || |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1037 | !CBB_add_bytes(&child, (const uint8_t *)ssl->psk_identity_hint, |
| 1038 | len)) { |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 1039 | return -1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1040 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1041 | } |
| 1042 | |
Robert Sloan | 572a4e2 | 2017-04-17 10:52:19 -0700 | [diff] [blame] | 1043 | if (alg_k & SSL_kECDHE) { |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 1044 | /* Determine the group to use. */ |
| 1045 | uint16_t group_id; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1046 | if (!tls1_get_shared_group(hs, &group_id)) { |
Robert Sloan | f6200e7 | 2017-07-10 08:09:18 -0700 | [diff] [blame] | 1047 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1048 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 1049 | return -1; |
| 1050 | } |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 1051 | hs->new_session->group_id = group_id; |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1052 | |
| 1053 | /* Set up ECDH, generate a key, and emit the public half. */ |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1054 | hs->key_share = SSLKeyShare::Create(group_id); |
| 1055 | if (!hs->key_share || |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 1056 | !CBB_add_u8(cbb.get(), NAMED_CURVE_TYPE) || |
| 1057 | !CBB_add_u16(cbb.get(), group_id) || |
| 1058 | !CBB_add_u8_length_prefixed(cbb.get(), &child) || |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1059 | !hs->key_share->Offer(&child)) { |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 1060 | return -1; |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 1061 | } |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1062 | } else { |
| 1063 | assert(alg_k & SSL_kPSK); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1064 | } |
| 1065 | |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 1066 | if (!CBB_finish(cbb.get(), &hs->server_params, &hs->server_params_len)) { |
| 1067 | return -1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1068 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1069 | } |
| 1070 | |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 1071 | return 1; |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1072 | } |
| 1073 | |
| 1074 | static int ssl3_send_server_key_exchange(SSL_HANDSHAKE *hs) { |
| 1075 | SSL *const ssl = hs->ssl; |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1076 | ScopedCBB cbb; |
| 1077 | CBB body, child; |
| 1078 | if (!ssl->method->init_message(ssl, cbb.get(), &body, |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1079 | SSL3_MT_SERVER_KEY_EXCHANGE) || |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1080 | /* |hs->server_params| contains a prefix for signing. */ |
| 1081 | hs->server_params_len < 2 * SSL3_RANDOM_SIZE || |
| 1082 | !CBB_add_bytes(&body, hs->server_params + 2 * SSL3_RANDOM_SIZE, |
| 1083 | hs->server_params_len - 2 * SSL3_RANDOM_SIZE)) { |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1084 | return -1; |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1085 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1086 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1087 | /* Add a signature. */ |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 1088 | if (ssl_cipher_uses_certificate_auth(hs->new_cipher)) { |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1089 | if (!ssl_has_private_key(ssl)) { |
| 1090 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1091 | return -1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1092 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1093 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1094 | /* Determine the signature algorithm. */ |
| 1095 | uint16_t signature_algorithm; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1096 | if (!tls1_choose_signature_algorithm(hs, &signature_algorithm)) { |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1097 | return -1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1098 | } |
| 1099 | if (ssl3_protocol_version(ssl) >= TLS1_2_VERSION) { |
| 1100 | if (!CBB_add_u16(&body, signature_algorithm)) { |
| 1101 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| 1102 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1103 | return -1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1104 | } |
| 1105 | } |
| 1106 | |
| 1107 | /* Add space for the signature. */ |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1108 | const size_t max_sig_len = EVP_PKEY_size(hs->local_pubkey.get()); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1109 | uint8_t *ptr; |
| 1110 | if (!CBB_add_u16_length_prefixed(&body, &child) || |
| 1111 | !CBB_reserve(&child, &ptr, max_sig_len)) { |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1112 | return -1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1113 | } |
| 1114 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1115 | size_t sig_len; |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1116 | switch (ssl_private_key_sign(hs, ptr, &sig_len, max_sig_len, |
| 1117 | signature_algorithm, hs->server_params, |
| 1118 | hs->server_params_len)) { |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1119 | case ssl_private_key_success: |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1120 | if (!CBB_did_write(&child, sig_len)) { |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1121 | return -1; |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1122 | } |
| 1123 | break; |
| 1124 | case ssl_private_key_failure: |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1125 | return -1; |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1126 | case ssl_private_key_retry: |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1127 | ssl->rwstate = SSL_PRIVATE_KEY_OPERATION; |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1128 | return -1; |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1129 | } |
Adam Langley | 1e4884f | 2015-09-24 10:57:52 -0700 | [diff] [blame] | 1130 | } |
| 1131 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1132 | if (!ssl_add_message_cbb(ssl, cbb.get())) { |
| 1133 | return -1; |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1134 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1135 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1136 | OPENSSL_free(hs->server_params); |
| 1137 | hs->server_params = NULL; |
| 1138 | hs->server_params_len = 0; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1139 | |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 1140 | return 1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1141 | } |
| 1142 | |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1143 | static int ssl3_send_server_hello_done(SSL_HANDSHAKE *hs) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1144 | SSL *const ssl = hs->ssl; |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1145 | ScopedCBB cbb; |
| 1146 | CBB body; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1147 | |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1148 | if (hs->cert_request) { |
| 1149 | CBB cert_types, sigalgs_cbb; |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1150 | if (!ssl->method->init_message(ssl, cbb.get(), &body, |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1151 | SSL3_MT_CERTIFICATE_REQUEST) || |
| 1152 | !CBB_add_u8_length_prefixed(&body, &cert_types) || |
| 1153 | !CBB_add_u8(&cert_types, SSL3_CT_RSA_SIGN) || |
| 1154 | (ssl3_protocol_version(ssl) >= TLS1_VERSION && |
| 1155 | !CBB_add_u8(&cert_types, TLS_CT_ECDSA_SIGN)) || |
| 1156 | (ssl3_protocol_version(ssl) >= TLS1_2_VERSION && |
| 1157 | (!CBB_add_u16_length_prefixed(&body, &sigalgs_cbb) || |
| 1158 | !tls12_add_verify_sigalgs(ssl, &sigalgs_cbb))) || |
| 1159 | !ssl_add_client_CA_list(ssl, &body) || |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1160 | !ssl_add_message_cbb(ssl, cbb.get())) { |
| 1161 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| 1162 | return -1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1163 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1164 | } |
| 1165 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1166 | if (!ssl->method->init_message(ssl, cbb.get(), &body, |
| 1167 | SSL3_MT_SERVER_HELLO_DONE) || |
| 1168 | !ssl_add_message_cbb(ssl, cbb.get())) { |
| 1169 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| 1170 | return -1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1171 | } |
| 1172 | |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 1173 | return 1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1174 | } |
| 1175 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1176 | static int ssl3_get_client_certificate(SSL_HANDSHAKE *hs) { |
| 1177 | SSL *const ssl = hs->ssl; |
| 1178 | assert(hs->cert_request); |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1179 | |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 1180 | int msg_ret = ssl->method->ssl_get_message(ssl); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1181 | if (msg_ret <= 0) { |
| 1182 | return msg_ret; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1183 | } |
| 1184 | |
| 1185 | if (ssl->s3->tmp.message_type != SSL3_MT_CERTIFICATE) { |
| 1186 | if (ssl->version == SSL3_VERSION && |
| 1187 | ssl->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) { |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1188 | /* In SSL 3.0, the Certificate message is omitted to signal no |
| 1189 | * certificate. */ |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1190 | if (ssl->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) { |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1191 | OPENSSL_PUT_ERROR(SSL, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1192 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); |
| 1193 | return -1; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1194 | } |
| 1195 | |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1196 | /* OpenSSL returns X509_V_OK when no certificates are received. This is |
| 1197 | * classed by them as a bug, but it's assumed by at least NGINX. */ |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 1198 | hs->new_session->verify_result = X509_V_OK; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1199 | ssl->s3->tmp.reuse_message = 1; |
| 1200 | return 1; |
| 1201 | } |
| 1202 | |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1203 | OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_MESSAGE); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1204 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); |
| 1205 | return -1; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1206 | } |
| 1207 | |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 1208 | if (!ssl_hash_current_message(hs)) { |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 1209 | return -1; |
| 1210 | } |
| 1211 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1212 | CBS certificate_msg; |
| 1213 | CBS_init(&certificate_msg, ssl->init_msg, ssl->init_num); |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1214 | |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 1215 | uint8_t alert = SSL_AD_DECODE_ERROR; |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 1216 | UniquePtr<STACK_OF(CRYPTO_BUFFER)> chain; |
| 1217 | if (!ssl_parse_cert_chain(&alert, &chain, &hs->peer_pubkey, |
| 1218 | ssl->retain_only_sha256_of_client_certs |
| 1219 | ? hs->new_session->peer_sha256 |
| 1220 | : NULL, |
| 1221 | &certificate_msg, ssl->ctx->pool)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1222 | ssl3_send_alert(ssl, SSL3_AL_FATAL, alert); |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1223 | return -1; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1224 | } |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 1225 | sk_CRYPTO_BUFFER_pop_free(hs->new_session->certs, CRYPTO_BUFFER_free); |
| 1226 | hs->new_session->certs = chain.release(); |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1227 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1228 | if (CBS_len(&certificate_msg) != 0 || |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1229 | !ssl->ctx->x509_method->session_cache_objects(hs->new_session.get())) { |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1230 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1231 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1232 | return -1; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1233 | } |
| 1234 | |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 1235 | if (sk_CRYPTO_BUFFER_num(hs->new_session->certs) == 0) { |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1236 | /* No client certificate so the handshake buffer may be discarded. */ |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1237 | hs->transcript.FreeBuffer(); |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1238 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1239 | /* In SSL 3.0, sending no certificate is signaled by omitting the |
| 1240 | * Certificate message. */ |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1241 | if (ssl->version == SSL3_VERSION) { |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1242 | OPENSSL_PUT_ERROR(SSL, SSL_R_NO_CERTIFICATES_RETURNED); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1243 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1244 | return -1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1245 | } |
| 1246 | |
| 1247 | if (ssl->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) { |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1248 | /* Fail for TLS only if we required a certificate */ |
| 1249 | OPENSSL_PUT_ERROR(SSL, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1250 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1251 | return -1; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1252 | } |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1253 | |
| 1254 | /* OpenSSL returns X509_V_OK when no certificates are received. This is |
| 1255 | * classed by them as a bug, but it's assumed by at least NGINX. */ |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 1256 | hs->new_session->verify_result = X509_V_OK; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1257 | return 1; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1258 | } |
| 1259 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1260 | /* The hash will have been filled in. */ |
| 1261 | if (ssl->retain_only_sha256_of_client_certs) { |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 1262 | hs->new_session->peer_sha256_valid = 1; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1263 | } |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1264 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1265 | return 1; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1266 | } |
| 1267 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1268 | static int ssl3_get_client_key_exchange(SSL_HANDSHAKE *hs) { |
| 1269 | SSL *const ssl = hs->ssl; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1270 | CBS client_key_exchange; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1271 | uint8_t *premaster_secret = NULL; |
| 1272 | size_t premaster_secret_len = 0; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1273 | uint8_t *decrypt_buf = NULL; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1274 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1275 | if (hs->state == SSL3_ST_SR_KEY_EXCH_A) { |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 1276 | int ret = ssl->method->ssl_get_message(ssl); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1277 | if (ret <= 0) { |
| 1278 | return ret; |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 1279 | } |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1280 | } |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 1281 | |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1282 | if (!ssl_check_message_type(ssl, SSL3_MT_CLIENT_KEY_EXCHANGE)) { |
| 1283 | return -1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1284 | } |
| 1285 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1286 | CBS_init(&client_key_exchange, ssl->init_msg, ssl->init_num); |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1287 | uint32_t alg_k = hs->new_cipher->algorithm_mkey; |
| 1288 | uint32_t alg_a = hs->new_cipher->algorithm_auth; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1289 | |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1290 | /* If using a PSK key exchange, parse the PSK identity. */ |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1291 | if (alg_a & SSL_aPSK) { |
| 1292 | CBS psk_identity; |
| 1293 | |
| 1294 | /* If using PSK, the ClientKeyExchange contains a psk_identity. If PSK, |
| 1295 | * then this is the only field in the message. */ |
| 1296 | if (!CBS_get_u16_length_prefixed(&client_key_exchange, &psk_identity) || |
| 1297 | ((alg_k & SSL_kPSK) && CBS_len(&client_key_exchange) != 0)) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1298 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1299 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 1300 | goto err; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1301 | } |
| 1302 | |
| 1303 | if (CBS_len(&psk_identity) > PSK_MAX_IDENTITY_LEN || |
| 1304 | CBS_contains_zero_byte(&psk_identity)) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1305 | OPENSSL_PUT_ERROR(SSL, SSL_R_DATA_LENGTH_TOO_LONG); |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1306 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); |
| 1307 | goto err; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1308 | } |
| 1309 | |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 1310 | if (!CBS_strdup(&psk_identity, &hs->new_session->psk_identity)) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1311 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1312 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 1313 | goto err; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1314 | } |
| 1315 | } |
| 1316 | |
| 1317 | /* Depending on the key exchange method, compute |premaster_secret| and |
| 1318 | * |premaster_secret_len|. */ |
| 1319 | if (alg_k & SSL_kRSA) { |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1320 | CBS encrypted_premaster_secret; |
| 1321 | if (ssl->version > SSL3_VERSION) { |
| 1322 | if (!CBS_get_u16_length_prefixed(&client_key_exchange, |
| 1323 | &encrypted_premaster_secret) || |
| 1324 | CBS_len(&client_key_exchange) != 0) { |
| 1325 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 1326 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 1327 | goto err; |
| 1328 | } |
| 1329 | } else { |
| 1330 | encrypted_premaster_secret = client_key_exchange; |
| 1331 | } |
| 1332 | |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1333 | /* Allocate a buffer large enough for an RSA decryption. */ |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1334 | const size_t rsa_size = EVP_PKEY_size(hs->local_pubkey.get()); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 1335 | decrypt_buf = (uint8_t *)OPENSSL_malloc(rsa_size); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1336 | if (decrypt_buf == NULL) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1337 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1338 | goto err; |
| 1339 | } |
| 1340 | |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1341 | /* Decrypt with no padding. PKCS#1 padding will be removed as part of the |
| 1342 | * timing-sensitive code below. */ |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1343 | size_t decrypt_len; |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1344 | switch (ssl_private_key_decrypt(hs, decrypt_buf, &decrypt_len, rsa_size, |
| 1345 | CBS_data(&encrypted_premaster_secret), |
| 1346 | CBS_len(&encrypted_premaster_secret))) { |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 1347 | case ssl_private_key_success: |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 1348 | break; |
| 1349 | case ssl_private_key_failure: |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 1350 | goto err; |
| 1351 | case ssl_private_key_retry: |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1352 | ssl->rwstate = SSL_PRIVATE_KEY_OPERATION; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1353 | hs->state = SSL3_ST_SR_KEY_EXCH_B; |
Kenny Root | e99801b | 2015-11-06 15:31:15 -0800 | [diff] [blame] | 1354 | goto err; |
| 1355 | } |
| 1356 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 1357 | if (decrypt_len != rsa_size) { |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 1358 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECRYPTION_FAILED); |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1359 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR); |
| 1360 | goto err; |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 1361 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1362 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1363 | /* Prepare a random premaster, to be used on invalid padding. See RFC 5246, |
| 1364 | * section 7.4.7.1. */ |
| 1365 | premaster_secret_len = SSL_MAX_MASTER_KEY_LENGTH; |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 1366 | premaster_secret = (uint8_t *)OPENSSL_malloc(premaster_secret_len); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1367 | if (premaster_secret == NULL) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1368 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1369 | goto err; |
| 1370 | } |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1371 | if (!RAND_bytes(premaster_secret, premaster_secret_len)) { |
| 1372 | goto err; |
| 1373 | } |
| 1374 | |
| 1375 | /* The smallest padded premaster is 11 bytes of overhead. Small keys are |
| 1376 | * publicly invalid. */ |
| 1377 | if (decrypt_len < 11 + premaster_secret_len) { |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1378 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECRYPTION_FAILED); |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1379 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR); |
| 1380 | goto err; |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1381 | } |
| 1382 | |
| 1383 | /* Check the padding. See RFC 3447, section 7.2.2. */ |
| 1384 | size_t padding_len = decrypt_len - premaster_secret_len; |
| 1385 | uint8_t good = constant_time_eq_int_8(decrypt_buf[0], 0) & |
| 1386 | constant_time_eq_int_8(decrypt_buf[1], 2); |
David Benjamin | 7c0d06c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1387 | for (size_t i = 2; i < padding_len - 1; i++) { |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1388 | good &= ~constant_time_is_zero_8(decrypt_buf[i]); |
| 1389 | } |
| 1390 | good &= constant_time_is_zero_8(decrypt_buf[padding_len - 1]); |
| 1391 | |
| 1392 | /* The premaster secret must begin with |client_version|. This too must be |
| 1393 | * checked in constant time (http://eprint.iacr.org/2003/052/). */ |
| 1394 | good &= constant_time_eq_8(decrypt_buf[padding_len], |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1395 | (unsigned)(hs->client_version >> 8)); |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1396 | good &= constant_time_eq_8(decrypt_buf[padding_len + 1], |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1397 | (unsigned)(hs->client_version & 0xff)); |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1398 | |
| 1399 | /* Select, in constant time, either the decrypted premaster or the random |
| 1400 | * premaster based on |good|. */ |
David Benjamin | 7c0d06c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1401 | for (size_t i = 0; i < premaster_secret_len; i++) { |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1402 | premaster_secret[i] = constant_time_select_8( |
| 1403 | good, decrypt_buf[padding_len + i], premaster_secret[i]); |
| 1404 | } |
| 1405 | |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1406 | OPENSSL_free(decrypt_buf); |
| 1407 | decrypt_buf = NULL; |
Robert Sloan | 572a4e2 | 2017-04-17 10:52:19 -0700 | [diff] [blame] | 1408 | } else if (alg_k & SSL_kECDHE) { |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 1409 | /* Parse the ClientKeyExchange. */ |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1410 | CBS peer_key; |
Robert Sloan | 572a4e2 | 2017-04-17 10:52:19 -0700 | [diff] [blame] | 1411 | if (!CBS_get_u8_length_prefixed(&client_key_exchange, &peer_key) || |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 1412 | CBS_len(&client_key_exchange) != 0) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1413 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1414 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 1415 | goto err; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1416 | } |
| 1417 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1418 | /* Compute the premaster. */ |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 1419 | uint8_t alert = SSL_AD_DECODE_ERROR; |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1420 | if (!hs->key_share->Finish(&premaster_secret, &premaster_secret_len, &alert, |
| 1421 | CBS_data(&peer_key), CBS_len(&peer_key))) { |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1422 | ssl3_send_alert(ssl, SSL3_AL_FATAL, alert); |
| 1423 | goto err; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1424 | } |
| 1425 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1426 | /* The key exchange state may now be discarded. */ |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1427 | hs->key_share.reset(); |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1428 | } else if (!(alg_k & SSL_kPSK)) { |
Robert Sloan | f6200e7 | 2017-07-10 08:09:18 -0700 | [diff] [blame] | 1429 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1430 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); |
| 1431 | goto err; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1432 | } |
| 1433 | |
| 1434 | /* For a PSK cipher suite, the actual pre-master secret is combined with the |
| 1435 | * pre-shared key. */ |
| 1436 | if (alg_a & SSL_aPSK) { |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1437 | if (ssl->psk_server_callback == NULL) { |
Robert Sloan | f6200e7 | 2017-07-10 08:09:18 -0700 | [diff] [blame] | 1438 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1439 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 1440 | goto err; |
| 1441 | } |
| 1442 | |
| 1443 | /* Look up the key for the identity. */ |
| 1444 | uint8_t psk[PSK_MAX_PSK_LEN]; |
| 1445 | unsigned psk_len = ssl->psk_server_callback( |
| 1446 | ssl, hs->new_session->psk_identity, psk, sizeof(psk)); |
| 1447 | if (psk_len > PSK_MAX_PSK_LEN) { |
| 1448 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| 1449 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 1450 | goto err; |
| 1451 | } else if (psk_len == 0) { |
| 1452 | /* PSK related to the given identity not found */ |
| 1453 | OPENSSL_PUT_ERROR(SSL, SSL_R_PSK_IDENTITY_NOT_FOUND); |
| 1454 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNKNOWN_PSK_IDENTITY); |
| 1455 | goto err; |
| 1456 | } |
| 1457 | |
| 1458 | if (alg_k & SSL_kPSK) { |
| 1459 | /* In plain PSK, other_secret is a block of 0s with the same length as the |
| 1460 | * pre-shared key. */ |
| 1461 | premaster_secret_len = psk_len; |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 1462 | premaster_secret = (uint8_t *)OPENSSL_malloc(premaster_secret_len); |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1463 | if (premaster_secret == NULL) { |
| 1464 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
| 1465 | goto err; |
| 1466 | } |
| 1467 | OPENSSL_memset(premaster_secret, 0, premaster_secret_len); |
| 1468 | } |
| 1469 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1470 | ScopedCBB new_premaster; |
| 1471 | CBB child; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1472 | uint8_t *new_data; |
| 1473 | size_t new_len; |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1474 | if (!CBB_init(new_premaster.get(), |
| 1475 | 2 + psk_len + 2 + premaster_secret_len) || |
| 1476 | !CBB_add_u16_length_prefixed(new_premaster.get(), &child) || |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1477 | !CBB_add_bytes(&child, premaster_secret, premaster_secret_len) || |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1478 | !CBB_add_u16_length_prefixed(new_premaster.get(), &child) || |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1479 | !CBB_add_bytes(&child, psk, psk_len) || |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1480 | !CBB_finish(new_premaster.get(), &new_data, &new_len)) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1481 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1482 | goto err; |
| 1483 | } |
| 1484 | |
| 1485 | OPENSSL_cleanse(premaster_secret, premaster_secret_len); |
| 1486 | OPENSSL_free(premaster_secret); |
| 1487 | premaster_secret = new_data; |
| 1488 | premaster_secret_len = new_len; |
| 1489 | } |
| 1490 | |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1491 | if (!ssl_hash_current_message(hs)) { |
| 1492 | goto err; |
| 1493 | } |
| 1494 | |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1495 | /* Compute the master secret */ |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 1496 | hs->new_session->master_key_length = tls1_generate_master_secret( |
| 1497 | hs, hs->new_session->master_key, premaster_secret, premaster_secret_len); |
| 1498 | if (hs->new_session->master_key_length == 0) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1499 | goto err; |
| 1500 | } |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 1501 | hs->new_session->extended_master_secret = hs->extended_master_secret; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1502 | |
| 1503 | OPENSSL_cleanse(premaster_secret, premaster_secret_len); |
| 1504 | OPENSSL_free(premaster_secret); |
| 1505 | return 1; |
| 1506 | |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1507 | err: |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 1508 | if (premaster_secret != NULL) { |
| 1509 | OPENSSL_cleanse(premaster_secret, premaster_secret_len); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1510 | OPENSSL_free(premaster_secret); |
| 1511 | } |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 1512 | OPENSSL_free(decrypt_buf); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1513 | |
| 1514 | return -1; |
| 1515 | } |
| 1516 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1517 | static int ssl3_get_cert_verify(SSL_HANDSHAKE *hs) { |
| 1518 | SSL *const ssl = hs->ssl; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1519 | CBS certificate_verify, signature; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1520 | |
| 1521 | /* Only RSA and ECDSA client certificates are supported, so a |
| 1522 | * CertificateVerify is required if and only if there's a client certificate. |
| 1523 | * */ |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1524 | if (!hs->peer_pubkey) { |
| 1525 | hs->transcript.FreeBuffer(); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1526 | return 1; |
| 1527 | } |
| 1528 | |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 1529 | int msg_ret = ssl->method->ssl_get_message(ssl); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1530 | if (msg_ret <= 0) { |
| 1531 | return msg_ret; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1532 | } |
| 1533 | |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 1534 | if (!ssl_check_message_type(ssl, SSL3_MT_CERTIFICATE_VERIFY)) { |
| 1535 | return -1; |
| 1536 | } |
| 1537 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1538 | CBS_init(&certificate_verify, ssl->init_msg, ssl->init_num); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1539 | |
| 1540 | /* Determine the digest type if needbe. */ |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1541 | uint16_t signature_algorithm = 0; |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 1542 | if (ssl3_protocol_version(ssl) >= TLS1_2_VERSION) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1543 | if (!CBS_get_u16(&certificate_verify, &signature_algorithm)) { |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1544 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1545 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 1546 | return -1; |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1547 | } |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1548 | uint8_t alert = SSL_AD_DECODE_ERROR; |
| 1549 | if (!tls12_check_peer_sigalg(ssl, &alert, signature_algorithm)) { |
| 1550 | ssl3_send_alert(ssl, SSL3_AL_FATAL, alert); |
| 1551 | return -1; |
Adam Langley | fad6327 | 2015-11-12 12:15:39 -0800 | [diff] [blame] | 1552 | } |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 1553 | hs->new_session->peer_signature_algorithm = signature_algorithm; |
Robert Sloan | 2424d84 | 2017-05-01 07:46:28 -0700 | [diff] [blame] | 1554 | } else if (!tls1_get_legacy_signature_algorithm(&signature_algorithm, |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1555 | hs->peer_pubkey.get())) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1556 | OPENSSL_PUT_ERROR(SSL, SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE); |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1557 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNSUPPORTED_CERTIFICATE); |
| 1558 | return -1; |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 1559 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1560 | |
| 1561 | /* Parse and verify the signature. */ |
| 1562 | if (!CBS_get_u16_length_prefixed(&certificate_verify, &signature) || |
| 1563 | CBS_len(&certificate_verify) != 0) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1564 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1565 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 1566 | return -1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1567 | } |
| 1568 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1569 | int sig_ok; |
| 1570 | /* The SSL3 construction for CertificateVerify does not decompose into a |
| 1571 | * single final digest and signature, and must be special-cased. */ |
| 1572 | if (ssl3_protocol_version(ssl) == SSL3_VERSION) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1573 | uint8_t digest[EVP_MAX_MD_SIZE]; |
| 1574 | size_t digest_len; |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1575 | if (!hs->transcript.GetSSL3CertVerifyHash( |
| 1576 | digest, &digest_len, hs->new_session.get(), signature_algorithm)) { |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1577 | return -1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1578 | } |
| 1579 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1580 | UniquePtr<EVP_PKEY_CTX> pctx( |
| 1581 | EVP_PKEY_CTX_new(hs->peer_pubkey.get(), nullptr)); |
| 1582 | sig_ok = pctx && |
| 1583 | EVP_PKEY_verify_init(pctx.get()) && |
| 1584 | EVP_PKEY_verify(pctx.get(), CBS_data(&signature), |
| 1585 | CBS_len(&signature), digest, digest_len); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1586 | } else { |
| 1587 | sig_ok = ssl_public_key_verify( |
| 1588 | ssl, CBS_data(&signature), CBS_len(&signature), signature_algorithm, |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1589 | hs->peer_pubkey.get(), hs->transcript.buffer_data(), |
| 1590 | hs->transcript.buffer_len()); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1591 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1592 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 1593 | #if defined(BORINGSSL_UNSAFE_FUZZER_MODE) |
| 1594 | sig_ok = 1; |
| 1595 | ERR_clear_error(); |
| 1596 | #endif |
| 1597 | if (!sig_ok) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 1598 | OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_SIGNATURE); |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1599 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR); |
| 1600 | return -1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1601 | } |
| 1602 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1603 | /* The handshake buffer is no longer necessary, and we may hash the current |
| 1604 | * message.*/ |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1605 | hs->transcript.FreeBuffer(); |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 1606 | if (!ssl_hash_current_message(hs)) { |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1607 | return -1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1608 | } |
| 1609 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 1610 | return 1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1611 | } |
| 1612 | |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1613 | /* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It |
| 1614 | * sets the next_proto member in s if found */ |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1615 | static int ssl3_get_next_proto(SSL_HANDSHAKE *hs) { |
| 1616 | SSL *const ssl = hs->ssl; |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 1617 | int ret = ssl->method->ssl_get_message(ssl); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1618 | if (ret <= 0) { |
| 1619 | return ret; |
| 1620 | } |
| 1621 | |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 1622 | if (!ssl_check_message_type(ssl, SSL3_MT_NEXT_PROTO) || |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 1623 | !ssl_hash_current_message(hs)) { |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 1624 | return -1; |
| 1625 | } |
| 1626 | |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1627 | CBS next_protocol, selected_protocol, padding; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1628 | CBS_init(&next_protocol, ssl->init_msg, ssl->init_num); |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1629 | if (!CBS_get_u8_length_prefixed(&next_protocol, &selected_protocol) || |
| 1630 | !CBS_get_u8_length_prefixed(&next_protocol, &padding) || |
David Benjamin | 7c0d06c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1631 | CBS_len(&next_protocol) != 0) { |
| 1632 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 1633 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 1634 | return 0; |
| 1635 | } |
| 1636 | |
| 1637 | if (!CBS_stow(&selected_protocol, &ssl->s3->next_proto_negotiated, |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1638 | &ssl->s3->next_proto_negotiated_len)) { |
| 1639 | return 0; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1640 | } |
| 1641 | |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1642 | return 1; |
| 1643 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1644 | |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1645 | /* ssl3_get_channel_id reads and verifies a ClientID handshake message. */ |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1646 | static int ssl3_get_channel_id(SSL_HANDSHAKE *hs) { |
| 1647 | SSL *const ssl = hs->ssl; |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 1648 | int msg_ret = ssl->method->ssl_get_message(ssl); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1649 | if (msg_ret <= 0) { |
| 1650 | return msg_ret; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1651 | } |
| 1652 | |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 1653 | if (!ssl_check_message_type(ssl, SSL3_MT_CHANNEL_ID) || |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 1654 | !tls1_verify_channel_id(hs) || |
| 1655 | !ssl_hash_current_message(hs)) { |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame] | 1656 | return -1; |
| 1657 | } |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 1658 | return 1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1659 | } |
| 1660 | |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1661 | static int ssl3_send_server_finished(SSL_HANDSHAKE *hs) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1662 | SSL *const ssl = hs->ssl; |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1663 | |
| 1664 | if (hs->ticket_expected) { |
| 1665 | const SSL_SESSION *session; |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1666 | UniquePtr<SSL_SESSION> session_copy; |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1667 | if (ssl->session == NULL) { |
| 1668 | /* Fix the timeout to measure from the ticket issuance time. */ |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1669 | ssl_session_rebase_time(ssl, hs->new_session.get()); |
| 1670 | session = hs->new_session.get(); |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1671 | } else { |
| 1672 | /* We are renewing an existing session. Duplicate the session to adjust |
| 1673 | * the timeout. */ |
| 1674 | session_copy = SSL_SESSION_dup(ssl->session, SSL_SESSION_INCLUDE_NONAUTH); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1675 | if (!session_copy) { |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1676 | return -1; |
| 1677 | } |
| 1678 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1679 | ssl_session_rebase_time(ssl, session_copy.get()); |
| 1680 | session = session_copy.get(); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 1681 | } |
| 1682 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1683 | ScopedCBB cbb; |
| 1684 | CBB body, ticket; |
| 1685 | if (!ssl->method->init_message(ssl, cbb.get(), &body, |
| 1686 | SSL3_MT_NEW_SESSION_TICKET) || |
| 1687 | !CBB_add_u32(&body, session->timeout) || |
| 1688 | !CBB_add_u16_length_prefixed(&body, &ticket) || |
| 1689 | !ssl_encrypt_ticket(ssl, &ticket, session) || |
| 1690 | !ssl_add_message_cbb(ssl, cbb.get())) { |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1691 | return -1; |
| 1692 | } |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 1693 | } |
| 1694 | |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1695 | if (!ssl->method->add_change_cipher_spec(ssl) || |
| 1696 | !tls1_change_cipher_state(hs, SSL3_CHANGE_CIPHER_SERVER_WRITE)) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 1697 | return -1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1698 | } |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 1699 | |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1700 | return ssl3_send_finished(hs); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1701 | } |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1702 | |
| 1703 | } // namespace bssl |