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) 1998-2002 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 | * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. |
| 110 | * ECC cipher suite support in OpenSSL originally developed by |
| 111 | * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project. */ |
| 112 | |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 113 | #include <openssl/ssl.h> |
| 114 | |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 115 | #include <assert.h> |
| 116 | #include <limits.h> |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 117 | #include <string.h> |
| 118 | |
| 119 | #include <openssl/buf.h> |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 120 | #include <openssl/err.h> |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 121 | #include <openssl/evp.h> |
| 122 | #include <openssl/mem.h> |
| 123 | #include <openssl/md5.h> |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 124 | #include <openssl/nid.h> |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 125 | #include <openssl/rand.h> |
| 126 | #include <openssl/sha.h> |
| 127 | #include <openssl/x509.h> |
| 128 | |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 129 | #include "internal.h" |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 130 | |
| 131 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 132 | /* ssl3_do_write sends |ssl->init_buf| in records of type 'type' |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame^] | 133 | * (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC). It returns 1 on success |
| 134 | * and <= 0 on error. */ |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 135 | int ssl3_do_write(SSL *ssl, int type) { |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame^] | 136 | int ret = ssl3_write_bytes(ssl, type, ssl->init_buf->data, ssl->init_num); |
| 137 | if (ret <= 0) { |
| 138 | return ret; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 139 | } |
| 140 | |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame^] | 141 | /* ssl3_write_bytes writes the data in its entirety. */ |
| 142 | assert(ret == ssl->init_num); |
| 143 | ssl_do_msg_callback(ssl, 1 /* write */, ssl->version, type, |
| 144 | ssl->init_buf->data, (size_t)ssl->init_num); |
| 145 | ssl->init_num = 0; |
| 146 | return 1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 147 | } |
| 148 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 149 | int ssl3_send_finished(SSL *ssl, int a, int b) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 150 | uint8_t *p; |
| 151 | int n; |
| 152 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 153 | if (ssl->state == a) { |
| 154 | p = ssl_handshake_start(ssl); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 155 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 156 | n = ssl->s3->enc_method->final_finish_mac(ssl, ssl->server, |
| 157 | ssl->s3->tmp.finish_md); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 158 | if (n == 0) { |
| 159 | return 0; |
| 160 | } |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 161 | ssl->s3->tmp.finish_md_len = n; |
| 162 | memcpy(p, ssl->s3->tmp.finish_md, n); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 163 | |
| 164 | /* Log the master secret, if logging is enabled. */ |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 165 | if (!ssl_log_master_secret(ssl, ssl->s3->client_random, SSL3_RANDOM_SIZE, |
| 166 | ssl->session->master_key, |
| 167 | ssl->session->master_key_length)) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 168 | return 0; |
| 169 | } |
| 170 | |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 171 | /* Copy the finished so we can use it for renegotiation checks */ |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 172 | if (ssl->server) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 173 | assert(n <= EVP_MAX_MD_SIZE); |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 174 | memcpy(ssl->s3->previous_server_finished, ssl->s3->tmp.finish_md, n); |
| 175 | ssl->s3->previous_server_finished_len = n; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 176 | } else { |
| 177 | assert(n <= EVP_MAX_MD_SIZE); |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 178 | memcpy(ssl->s3->previous_client_finished, ssl->s3->tmp.finish_md, n); |
| 179 | ssl->s3->previous_client_finished_len = n; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 180 | } |
| 181 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 182 | if (!ssl_set_handshake_header(ssl, SSL3_MT_FINISHED, n)) { |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 183 | return 0; |
| 184 | } |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 185 | ssl->state = b; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 186 | } |
| 187 | |
| 188 | /* SSL3_ST_SEND_xxxxxx_HELLO_B */ |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 189 | return ssl_do_write(ssl); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 190 | } |
| 191 | |
Adam Langley | f4e4272 | 2015-06-04 17:45:09 -0700 | [diff] [blame] | 192 | /* ssl3_take_mac calculates the Finished MAC for the handshakes messages seen |
| 193 | * so far. */ |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 194 | static void ssl3_take_mac(SSL *ssl) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 195 | /* If no new cipher setup then return immediately: other functions will set |
| 196 | * the appropriate error. */ |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 197 | if (ssl->s3->tmp.new_cipher == NULL) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 198 | return; |
| 199 | } |
| 200 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 201 | ssl->s3->tmp.peer_finish_md_len = ssl->s3->enc_method->final_finish_mac( |
| 202 | ssl, !ssl->server, ssl->s3->tmp.peer_finish_md); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 203 | } |
| 204 | |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 205 | int ssl3_get_finished(SSL *ssl) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 206 | int al, finished_len, ok; |
| 207 | long message_len; |
| 208 | uint8_t *p; |
| 209 | |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 210 | message_len = ssl->method->ssl_get_message(ssl, SSL3_MT_FINISHED, |
| 211 | ssl_dont_hash_message, &ok); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 212 | |
| 213 | if (!ok) { |
| 214 | return message_len; |
| 215 | } |
| 216 | |
| 217 | /* Snapshot the finished hash before incorporating the new message. */ |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 218 | ssl3_take_mac(ssl); |
| 219 | if (!ssl3_hash_current_message(ssl)) { |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 220 | goto err; |
| 221 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 222 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 223 | p = ssl->init_msg; |
| 224 | finished_len = ssl->s3->tmp.peer_finish_md_len; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 225 | |
| 226 | if (finished_len != message_len) { |
| 227 | al = SSL_AD_DECODE_ERROR; |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 228 | OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_DIGEST_LENGTH); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 229 | goto f_err; |
| 230 | } |
| 231 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 232 | int finished_ret = |
| 233 | CRYPTO_memcmp(p, ssl->s3->tmp.peer_finish_md, finished_len); |
| 234 | #if defined(BORINGSSL_UNSAFE_FUZZER_MODE) |
| 235 | finished_ret = 0; |
| 236 | #endif |
| 237 | if (finished_ret != 0) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 238 | al = SSL_AD_DECRYPT_ERROR; |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 239 | OPENSSL_PUT_ERROR(SSL, SSL_R_DIGEST_CHECK_FAILED); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 240 | goto f_err; |
| 241 | } |
| 242 | |
| 243 | /* Copy the finished so we can use it for renegotiation checks */ |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 244 | if (ssl->server) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 245 | assert(finished_len <= EVP_MAX_MD_SIZE); |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 246 | memcpy(ssl->s3->previous_client_finished, ssl->s3->tmp.peer_finish_md, |
| 247 | finished_len); |
| 248 | ssl->s3->previous_client_finished_len = finished_len; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 249 | } else { |
| 250 | assert(finished_len <= EVP_MAX_MD_SIZE); |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 251 | memcpy(ssl->s3->previous_server_finished, ssl->s3->tmp.peer_finish_md, |
| 252 | finished_len); |
| 253 | ssl->s3->previous_server_finished_len = finished_len; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 254 | } |
| 255 | |
| 256 | return 1; |
| 257 | |
| 258 | f_err: |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 259 | ssl3_send_alert(ssl, SSL3_AL_FATAL, al); |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 260 | err: |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 261 | return 0; |
| 262 | } |
| 263 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 264 | int ssl3_send_change_cipher_spec(SSL *ssl, int a, int b) { |
| 265 | if (ssl->state == a) { |
| 266 | *((uint8_t *)ssl->init_buf->data) = SSL3_MT_CCS; |
| 267 | ssl->init_num = 1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 268 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 269 | ssl->state = b; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 270 | } |
| 271 | |
| 272 | /* SSL3_ST_CW_CHANGE_B */ |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 273 | return ssl3_do_write(ssl, SSL3_RT_CHANGE_CIPHER_SPEC); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 274 | } |
| 275 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 276 | int ssl3_output_cert_chain(SSL *ssl) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 277 | uint8_t *p; |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 278 | unsigned long l = 3 + SSL_HM_HEADER_LENGTH(ssl); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 279 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 280 | if (!ssl_add_cert_chain(ssl, &l)) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 281 | return 0; |
| 282 | } |
| 283 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 284 | l -= 3 + SSL_HM_HEADER_LENGTH(ssl); |
| 285 | p = ssl_handshake_start(ssl); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 286 | l2n3(l, p); |
| 287 | l += 3; |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 288 | return ssl_set_handshake_header(ssl, SSL3_MT_CERTIFICATE, l); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 289 | } |
| 290 | |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 291 | size_t ssl_max_handshake_message_len(const SSL *ssl) { |
| 292 | /* kMaxMessageLen is the default maximum message size for handshakes which do |
| 293 | * not accept peer certificate chains. */ |
| 294 | static const size_t kMaxMessageLen = 16384; |
| 295 | |
| 296 | if ((!ssl->server || (ssl->verify_mode & SSL_VERIFY_PEER)) && |
| 297 | kMaxMessageLen < ssl->max_cert_list) { |
| 298 | return ssl->max_cert_list; |
| 299 | } |
| 300 | return kMaxMessageLen; |
| 301 | } |
| 302 | |
| 303 | static int extend_handshake_buffer(SSL *ssl, size_t length) { |
| 304 | if (!BUF_MEM_reserve(ssl->init_buf, length)) { |
| 305 | return -1; |
| 306 | } |
| 307 | while (ssl->init_buf->length < length) { |
| 308 | int ret = |
| 309 | ssl3_read_bytes(ssl, SSL3_RT_HANDSHAKE, |
| 310 | (uint8_t *)ssl->init_buf->data + ssl->init_buf->length, |
| 311 | length - ssl->init_buf->length, 0); |
| 312 | if (ret <= 0) { |
| 313 | return ret; |
| 314 | } |
| 315 | ssl->init_buf->length += (size_t)ret; |
| 316 | } |
| 317 | return 1; |
| 318 | } |
| 319 | |
| 320 | /* Obtain handshake message of message type |msg_type| (any if |msg_type| == |
| 321 | * -1). */ |
| 322 | long ssl3_get_message(SSL *ssl, int msg_type, |
| 323 | enum ssl_hash_message_t hash_message, int *ok) { |
| 324 | *ok = 0; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 325 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 326 | if (ssl->s3->tmp.reuse_message) { |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 327 | /* A ssl_dont_hash_message call cannot be combined with reuse_message; the |
| 328 | * ssl_dont_hash_message would have to have been applied to the previous |
| 329 | * call. */ |
| 330 | assert(hash_message == ssl_hash_message); |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 331 | assert(ssl->s3->tmp.message_complete); |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 332 | ssl->s3->tmp.reuse_message = 0; |
| 333 | if (msg_type >= 0 && ssl->s3->tmp.message_type != msg_type) { |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 334 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 335 | OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_MESSAGE); |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 336 | return -1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 337 | } |
| 338 | *ok = 1; |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 339 | assert(ssl->init_buf->length >= 4); |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 340 | ssl->init_msg = (uint8_t *)ssl->init_buf->data + 4; |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 341 | ssl->init_num = (int)ssl->init_buf->length - 4; |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 342 | return ssl->init_num; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 343 | } |
| 344 | |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 345 | again: |
| 346 | if (ssl->s3->tmp.message_complete) { |
| 347 | ssl->s3->tmp.message_complete = 0; |
| 348 | ssl->init_buf->length = 0; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 349 | } |
| 350 | |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 351 | /* Read the message header, if we haven't yet. */ |
| 352 | int ret = extend_handshake_buffer(ssl, 4); |
| 353 | if (ret <= 0) { |
| 354 | return ret; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 355 | } |
| 356 | |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 357 | /* Parse out the length. Cap it so the peer cannot force us to buffer up to |
| 358 | * 2^24 bytes. */ |
| 359 | const uint8_t *p = (uint8_t *)ssl->init_buf->data; |
| 360 | size_t msg_len = (((uint32_t)p[1]) << 16) | (((uint32_t)p[2]) << 8) | p[3]; |
| 361 | if (msg_len > ssl_max_handshake_message_len(ssl)) { |
| 362 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); |
| 363 | OPENSSL_PUT_ERROR(SSL, SSL_R_EXCESSIVE_MESSAGE_SIZE); |
| 364 | return -1; |
| 365 | } |
| 366 | |
| 367 | /* Read the message body, if we haven't yet. */ |
| 368 | ret = extend_handshake_buffer(ssl, 4 + msg_len); |
| 369 | if (ret <= 0) { |
| 370 | return ret; |
| 371 | } |
| 372 | |
| 373 | /* We have now received a complete message. */ |
| 374 | ssl->s3->tmp.message_complete = 1; |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame^] | 375 | ssl_do_msg_callback(ssl, 0 /* read */, ssl->version, SSL3_RT_HANDSHAKE, |
| 376 | ssl->init_buf->data, ssl->init_buf->length); |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 377 | |
| 378 | static const uint8_t kHelloRequest[4] = {SSL3_MT_HELLO_REQUEST, 0, 0, 0}; |
| 379 | if (!ssl->server && ssl->init_buf->length == sizeof(kHelloRequest) && |
| 380 | memcmp(kHelloRequest, ssl->init_buf->data, sizeof(kHelloRequest)) == 0) { |
| 381 | /* The server may always send 'Hello Request' messages -- we are doing a |
| 382 | * handshake anyway now, so ignore them if their format is correct. Does |
| 383 | * not count for 'Finished' MAC. */ |
| 384 | goto again; |
| 385 | } |
| 386 | |
| 387 | uint8_t actual_type = ((const uint8_t *)ssl->init_buf->data)[0]; |
| 388 | if (msg_type >= 0 && actual_type != msg_type) { |
| 389 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); |
| 390 | OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_MESSAGE); |
| 391 | return -1; |
| 392 | } |
| 393 | ssl->s3->tmp.message_type = actual_type; |
| 394 | |
| 395 | ssl->init_msg = (uint8_t*)ssl->init_buf->data + 4; |
| 396 | ssl->init_num = ssl->init_buf->length - 4; |
| 397 | |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 398 | /* Feed this message into MAC computation. */ |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 399 | if (hash_message == ssl_hash_message && !ssl3_hash_current_message(ssl)) { |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 400 | return -1; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 401 | } |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 402 | |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 403 | *ok = 1; |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 404 | return ssl->init_num; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 405 | } |
| 406 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 407 | int ssl3_hash_current_message(SSL *ssl) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 408 | /* The handshake header (different size between DTLS and TLS) is included in |
| 409 | * the hash. */ |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 410 | size_t header_len = ssl->init_msg - (uint8_t *)ssl->init_buf->data; |
| 411 | return ssl3_update_handshake_hash(ssl, (uint8_t *)ssl->init_buf->data, |
| 412 | ssl->init_num + header_len); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 413 | } |
| 414 | |
| 415 | /* ssl3_cert_verify_hash is documented as needing EVP_MAX_MD_SIZE because that |
| 416 | * is sufficient pre-TLS1.2 as well. */ |
| 417 | OPENSSL_COMPILE_ASSERT(EVP_MAX_MD_SIZE > MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, |
| 418 | combined_tls_hash_fits_in_max); |
| 419 | |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 420 | int ssl3_cert_verify_hash(SSL *ssl, uint8_t *out, size_t *out_len, |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 421 | const EVP_MD **out_md, int pkey_type) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 422 | /* For TLS v1.2 send signature algorithm and signature using |
| 423 | * agreed digest and cached handshake records. Otherwise, use |
| 424 | * SHA1 or MD5 + SHA1 depending on key type. */ |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 425 | if (ssl3_protocol_version(ssl) >= TLS1_2_VERSION) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 426 | EVP_MD_CTX mctx; |
| 427 | unsigned len; |
| 428 | |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 429 | EVP_MD_CTX_init(&mctx); |
| 430 | if (!EVP_DigestInit_ex(&mctx, *out_md, NULL) || |
Adam Langley | 4139edb | 2016-01-13 15:00:54 -0800 | [diff] [blame] | 431 | !EVP_DigestUpdate(&mctx, ssl->s3->handshake_buffer->data, |
| 432 | ssl->s3->handshake_buffer->length) || |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 433 | !EVP_DigestFinal(&mctx, out, &len)) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 434 | OPENSSL_PUT_ERROR(SSL, ERR_R_EVP_LIB); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 435 | EVP_MD_CTX_cleanup(&mctx); |
| 436 | return 0; |
| 437 | } |
| 438 | *out_len = len; |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 439 | } else if (pkey_type == EVP_PKEY_RSA) { |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 440 | if (ssl->s3->enc_method->cert_verify_mac(ssl, NID_md5, out) == 0 || |
| 441 | ssl->s3->enc_method->cert_verify_mac(ssl, NID_sha1, |
| 442 | out + MD5_DIGEST_LENGTH) == 0) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 443 | return 0; |
| 444 | } |
| 445 | *out_len = MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH; |
| 446 | *out_md = EVP_md5_sha1(); |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 447 | } else if (pkey_type == EVP_PKEY_EC) { |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 448 | if (ssl->s3->enc_method->cert_verify_mac(ssl, NID_sha1, out) == 0) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 449 | return 0; |
| 450 | } |
| 451 | *out_len = SHA_DIGEST_LENGTH; |
| 452 | *out_md = EVP_sha1(); |
| 453 | } else { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 454 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 455 | return 0; |
| 456 | } |
| 457 | |
| 458 | return 1; |
| 459 | } |
| 460 | |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 461 | int ssl_verify_alarm_type(long type) { |
| 462 | int al; |
| 463 | |
| 464 | switch (type) { |
| 465 | case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: |
| 466 | case X509_V_ERR_UNABLE_TO_GET_CRL: |
| 467 | case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER: |
| 468 | al = SSL_AD_UNKNOWN_CA; |
| 469 | break; |
| 470 | |
| 471 | case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE: |
| 472 | case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE: |
| 473 | case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY: |
| 474 | case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: |
| 475 | case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: |
| 476 | case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD: |
| 477 | case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD: |
| 478 | case X509_V_ERR_CERT_NOT_YET_VALID: |
| 479 | case X509_V_ERR_CRL_NOT_YET_VALID: |
| 480 | case X509_V_ERR_CERT_UNTRUSTED: |
| 481 | case X509_V_ERR_CERT_REJECTED: |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame^] | 482 | case X509_V_ERR_HOSTNAME_MISMATCH: |
| 483 | case X509_V_ERR_EMAIL_MISMATCH: |
| 484 | case X509_V_ERR_IP_ADDRESS_MISMATCH: |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 485 | al = SSL_AD_BAD_CERTIFICATE; |
| 486 | break; |
| 487 | |
| 488 | case X509_V_ERR_CERT_SIGNATURE_FAILURE: |
| 489 | case X509_V_ERR_CRL_SIGNATURE_FAILURE: |
| 490 | al = SSL_AD_DECRYPT_ERROR; |
| 491 | break; |
| 492 | |
| 493 | case X509_V_ERR_CERT_HAS_EXPIRED: |
| 494 | case X509_V_ERR_CRL_HAS_EXPIRED: |
| 495 | al = SSL_AD_CERTIFICATE_EXPIRED; |
| 496 | break; |
| 497 | |
| 498 | case X509_V_ERR_CERT_REVOKED: |
| 499 | al = SSL_AD_CERTIFICATE_REVOKED; |
| 500 | break; |
| 501 | |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame^] | 502 | case X509_V_ERR_UNSPECIFIED: |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 503 | case X509_V_ERR_OUT_OF_MEM: |
David Benjamin | 6e899c7 | 2016-06-09 18:02:18 -0400 | [diff] [blame^] | 504 | case X509_V_ERR_INVALID_CALL: |
| 505 | case X509_V_ERR_STORE_LOOKUP: |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 506 | al = SSL_AD_INTERNAL_ERROR; |
| 507 | break; |
| 508 | |
| 509 | case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: |
| 510 | case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN: |
| 511 | case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: |
| 512 | case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE: |
| 513 | case X509_V_ERR_CERT_CHAIN_TOO_LONG: |
| 514 | case X509_V_ERR_PATH_LENGTH_EXCEEDED: |
| 515 | case X509_V_ERR_INVALID_CA: |
| 516 | al = SSL_AD_UNKNOWN_CA; |
| 517 | break; |
| 518 | |
| 519 | case X509_V_ERR_APPLICATION_VERIFICATION: |
| 520 | al = SSL_AD_HANDSHAKE_FAILURE; |
| 521 | break; |
| 522 | |
| 523 | case X509_V_ERR_INVALID_PURPOSE: |
| 524 | al = SSL_AD_UNSUPPORTED_CERTIFICATE; |
| 525 | break; |
| 526 | |
| 527 | default: |
| 528 | al = SSL_AD_CERTIFICATE_UNKNOWN; |
| 529 | break; |
| 530 | } |
| 531 | |
| 532 | return al; |
| 533 | } |
| 534 | |
Adam Langley | f4e4272 | 2015-06-04 17:45:09 -0700 | [diff] [blame] | 535 | int ssl_fill_hello_random(uint8_t *out, size_t len, int is_server) { |
| 536 | if (is_server) { |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 537 | const uint32_t current_time = time(NULL); |
Adam Langley | f4e4272 | 2015-06-04 17:45:09 -0700 | [diff] [blame] | 538 | uint8_t *p = out; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 539 | |
| 540 | if (len < 4) { |
| 541 | return 0; |
| 542 | } |
| 543 | p[0] = current_time >> 24; |
| 544 | p[1] = current_time >> 16; |
| 545 | p[2] = current_time >> 8; |
| 546 | p[3] = current_time; |
| 547 | return RAND_bytes(p + 4, len - 4); |
| 548 | } else { |
Adam Langley | f4e4272 | 2015-06-04 17:45:09 -0700 | [diff] [blame] | 549 | return RAND_bytes(out, len); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 550 | } |
| 551 | } |