David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1 | /* Copyright (c) 2016, Google Inc. |
| 2 | * |
| 3 | * Permission to use, copy, modify, and/or distribute this software for any |
| 4 | * purpose with or without fee is hereby granted, provided that the above |
| 5 | * copyright notice and this permission notice appear in all copies. |
| 6 | * |
| 7 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 8 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 9 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
| 10 | * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 11 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
| 12 | * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
| 13 | * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ |
| 14 | |
| 15 | #include <openssl/ssl.h> |
| 16 | |
| 17 | #include <assert.h> |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 18 | #include <limits.h> |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 19 | #include <string.h> |
| 20 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 21 | #include <utility> |
| 22 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 23 | #include <openssl/bytestring.h> |
| 24 | #include <openssl/digest.h> |
| 25 | #include <openssl/err.h> |
| 26 | #include <openssl/mem.h> |
Robert Sloan | 726e9d1 | 2018-09-11 11:45:04 -0700 | [diff] [blame] | 27 | #include <openssl/sha.h> |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 28 | #include <openssl/stack.h> |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 29 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 30 | #include "../crypto/internal.h" |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 31 | #include "internal.h" |
| 32 | |
| 33 | |
Robert Sloan | 726e9d1 | 2018-09-11 11:45:04 -0700 | [diff] [blame] | 34 | BSSL_NAMESPACE_BEGIN |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 35 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 36 | enum client_hs_state_t { |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 37 | state_read_hello_retry_request = 0, |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 38 | state_send_second_client_hello, |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 39 | state_read_server_hello, |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 40 | state_read_encrypted_extensions, |
| 41 | state_read_certificate_request, |
| 42 | state_read_server_certificate, |
| 43 | state_read_server_certificate_verify, |
Robert Sloan | d9e572d | 2018-08-27 12:27:00 -0700 | [diff] [blame] | 44 | state_server_certificate_reverify, |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 45 | state_read_server_finished, |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 46 | state_send_end_of_early_data, |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 47 | state_send_client_certificate, |
| 48 | state_send_client_certificate_verify, |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 49 | state_complete_second_flight, |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 50 | state_done, |
| 51 | }; |
| 52 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 53 | static const uint8_t kZeroes[EVP_MAX_MD_SIZE] = {0}; |
| 54 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 55 | static enum ssl_hs_wait_t do_read_hello_retry_request(SSL_HANDSHAKE *hs) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 56 | SSL *const ssl = hs->ssl; |
Robert Sloan | 99319a1 | 2017-11-27 10:32:46 -0800 | [diff] [blame] | 57 | assert(ssl->s3->have_version); |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 58 | SSLMessage msg; |
| 59 | if (!ssl->method->get_message(ssl, &msg)) { |
| 60 | return ssl_hs_read_message; |
| 61 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 62 | |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 63 | // Queue up a ChangeCipherSpec for whenever we next send something. This |
| 64 | // will be before the second ClientHello. If we offered early data, this was |
| 65 | // already done. |
| 66 | if (!hs->early_data_offered && |
| 67 | !ssl->method->add_change_cipher_spec(ssl)) { |
| 68 | return ssl_hs_error; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 69 | } |
| 70 | |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 71 | if (!ssl_check_message_type(ssl, msg, SSL3_MT_SERVER_HELLO)) { |
| 72 | return ssl_hs_error; |
| 73 | } |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 74 | |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 75 | CBS body = msg.body, extensions, server_random, session_id; |
| 76 | uint16_t server_version, cipher_suite; |
| 77 | uint8_t compression_method; |
| 78 | if (!CBS_get_u16(&body, &server_version) || |
| 79 | !CBS_get_bytes(&body, &server_random, SSL3_RANDOM_SIZE) || |
| 80 | !CBS_get_u8_length_prefixed(&body, &session_id) || |
| 81 | !CBS_mem_equal(&session_id, hs->session_id, hs->session_id_len) || |
| 82 | !CBS_get_u16(&body, &cipher_suite) || |
| 83 | !CBS_get_u8(&body, &compression_method) || |
| 84 | compression_method != 0 || |
| 85 | !CBS_get_u16_length_prefixed(&body, &extensions) || |
| 86 | CBS_len(&extensions) == 0 || |
| 87 | CBS_len(&body) != 0) { |
| 88 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 89 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 90 | return ssl_hs_error; |
| 91 | } |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 92 | |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 93 | if (!CBS_mem_equal(&server_random, kHelloRetryRequest, SSL3_RANDOM_SIZE)) { |
| 94 | hs->tls13_state = state_read_server_hello; |
| 95 | return ssl_hs_ok; |
| 96 | } |
| 97 | |
| 98 | const SSL_CIPHER *cipher = SSL_get_cipher_by_value(cipher_suite); |
| 99 | // Check if the cipher is a TLS 1.3 cipher. |
| 100 | if (cipher == NULL || |
| 101 | SSL_CIPHER_get_min_version(cipher) > ssl_protocol_version(ssl) || |
| 102 | SSL_CIPHER_get_max_version(cipher) < ssl_protocol_version(ssl)) { |
| 103 | OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CIPHER_RETURNED); |
| 104 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); |
| 105 | return ssl_hs_error; |
| 106 | } |
| 107 | |
| 108 | hs->new_cipher = cipher; |
| 109 | |
| 110 | if (!hs->transcript.InitHash(ssl_protocol_version(ssl), hs->new_cipher) || |
| 111 | !hs->transcript.UpdateForHelloRetryRequest()) { |
| 112 | return ssl_hs_error; |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 113 | } |
| 114 | |
| 115 | |
Robert Sloan | d5c2215 | 2017-11-13 09:22:12 -0800 | [diff] [blame] | 116 | bool have_cookie, have_key_share, have_supported_versions; |
| 117 | CBS cookie, key_share, supported_versions; |
Robert Sloan | 0db7f54 | 2018-01-16 15:48:33 -0800 | [diff] [blame] | 118 | SSL_EXTENSION_TYPE ext_types[] = { |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 119 | {TLSEXT_TYPE_key_share, &have_key_share, &key_share}, |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 120 | {TLSEXT_TYPE_cookie, &have_cookie, &cookie}, |
Robert Sloan | d5c2215 | 2017-11-13 09:22:12 -0800 | [diff] [blame] | 121 | {TLSEXT_TYPE_supported_versions, &have_supported_versions, |
| 122 | &supported_versions}, |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 123 | }; |
| 124 | |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 125 | uint8_t alert = SSL_AD_DECODE_ERROR; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 126 | if (!ssl_parse_extensions(&extensions, &alert, ext_types, |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 127 | OPENSSL_ARRAY_SIZE(ext_types), |
| 128 | 0 /* reject unknown */)) { |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 129 | ssl_send_alert(ssl, SSL3_AL_FATAL, alert); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 130 | return ssl_hs_error; |
| 131 | } |
| 132 | |
Robert Sloan | 99319a1 | 2017-11-27 10:32:46 -0800 | [diff] [blame] | 133 | if (!have_cookie && !have_key_share) { |
| 134 | OPENSSL_PUT_ERROR(SSL, SSL_R_EMPTY_HELLO_RETRY_REQUEST); |
| 135 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); |
| 136 | return ssl_hs_error; |
| 137 | } |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 138 | if (have_cookie) { |
| 139 | CBS cookie_value; |
| 140 | if (!CBS_get_u16_length_prefixed(&cookie, &cookie_value) || |
| 141 | CBS_len(&cookie_value) == 0 || |
| 142 | CBS_len(&cookie) != 0) { |
David Benjamin | 95add82 | 2016-10-19 01:09:12 -0400 | [diff] [blame] | 143 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 144 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
David Benjamin | 95add82 | 2016-10-19 01:09:12 -0400 | [diff] [blame] | 145 | return ssl_hs_error; |
| 146 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 147 | |
Robert Sloan | 4562e9d | 2017-10-02 10:26:51 -0700 | [diff] [blame] | 148 | if (!hs->cookie.CopyFrom(cookie_value)) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 149 | return ssl_hs_error; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 150 | } |
| 151 | } |
| 152 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 153 | if (have_key_share) { |
| 154 | uint16_t group_id; |
| 155 | if (!CBS_get_u16(&key_share, &group_id) || CBS_len(&key_share) != 0) { |
| 156 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 157 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 158 | return ssl_hs_error; |
| 159 | } |
| 160 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 161 | // The group must be supported. |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 162 | if (!tls1_check_group_id(hs, group_id)) { |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 163 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 164 | OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CURVE); |
| 165 | return ssl_hs_error; |
| 166 | } |
| 167 | |
Robert Sloan | 11c28bd | 2018-12-17 12:09:20 -0800 | [diff] [blame] | 168 | // Check that the HelloRetryRequest does not request a key share that was |
| 169 | // provided in the initial ClientHello. |
| 170 | if (hs->key_shares[0]->GroupID() == group_id || |
| 171 | (hs->key_shares[1] && hs->key_shares[1]->GroupID() == group_id)) { |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 172 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 173 | OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CURVE); |
| 174 | return ssl_hs_error; |
| 175 | } |
| 176 | |
Robert Sloan | 11c28bd | 2018-12-17 12:09:20 -0800 | [diff] [blame] | 177 | hs->key_shares[0].reset(); |
| 178 | hs->key_shares[1].reset(); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 179 | hs->retry_group = group_id; |
| 180 | } |
| 181 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 182 | if (!ssl_hash_message(hs, msg)) { |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 183 | return ssl_hs_error; |
| 184 | } |
| 185 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 186 | ssl->method->next_message(ssl); |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 187 | hs->received_hello_retry_request = true; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 188 | hs->tls13_state = state_send_second_client_hello; |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 189 | // 0-RTT is rejected if we receive a HelloRetryRequest. |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 190 | if (hs->in_early_data) { |
| 191 | return ssl_hs_early_data_rejected; |
| 192 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 193 | return ssl_hs_ok; |
| 194 | } |
| 195 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 196 | static enum ssl_hs_wait_t do_send_second_client_hello(SSL_HANDSHAKE *hs) { |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 197 | SSL *const ssl = hs->ssl; |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 198 | // Restore the null cipher. We may have switched due to 0-RTT. |
Robert Sloan | db4251a | 2017-09-18 09:38:15 -0700 | [diff] [blame] | 199 | bssl::UniquePtr<SSLAEADContext> null_ctx = |
| 200 | SSLAEADContext::CreateNullCipher(SSL_is_dtls(ssl)); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 201 | if (!null_ctx || |
Robert Sloan | db4251a | 2017-09-18 09:38:15 -0700 | [diff] [blame] | 202 | !ssl->method->set_write_state(ssl, std::move(null_ctx))) { |
| 203 | return ssl_hs_error; |
| 204 | } |
| 205 | |
| 206 | ssl->s3->aead_write_ctx->SetVersionIfNullCipher(ssl->version); |
| 207 | |
| 208 | if (!ssl_write_client_hello(hs)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 209 | return ssl_hs_error; |
| 210 | } |
| 211 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 212 | hs->tls13_state = state_read_server_hello; |
| 213 | return ssl_hs_flush; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 214 | } |
| 215 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 216 | static enum ssl_hs_wait_t do_read_server_hello(SSL_HANDSHAKE *hs) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 217 | SSL *const ssl = hs->ssl; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 218 | SSLMessage msg; |
| 219 | if (!ssl->method->get_message(ssl, &msg)) { |
| 220 | return ssl_hs_read_message; |
| 221 | } |
| 222 | if (!ssl_check_message_type(ssl, msg, SSL3_MT_SERVER_HELLO)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 223 | return ssl_hs_error; |
| 224 | } |
| 225 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 226 | CBS body = msg.body, server_random, session_id, extensions; |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 227 | uint16_t server_version; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 228 | uint16_t cipher_suite; |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 229 | uint8_t compression_method; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 230 | if (!CBS_get_u16(&body, &server_version) || |
| 231 | !CBS_get_bytes(&body, &server_random, SSL3_RANDOM_SIZE) || |
Robert Sloan | 0da4395 | 2018-01-03 15:13:14 -0800 | [diff] [blame] | 232 | !CBS_get_u8_length_prefixed(&body, &session_id) || |
| 233 | !CBS_mem_equal(&session_id, hs->session_id, hs->session_id_len) || |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 234 | !CBS_get_u16(&body, &cipher_suite) || |
Robert Sloan | 0da4395 | 2018-01-03 15:13:14 -0800 | [diff] [blame] | 235 | !CBS_get_u8(&body, &compression_method) || |
| 236 | compression_method != 0 || |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 237 | !CBS_get_u16_length_prefixed(&body, &extensions) || |
| 238 | CBS_len(&body) != 0) { |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 239 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 240 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 241 | return ssl_hs_error; |
| 242 | } |
| 243 | |
Robert Sloan | 0da4395 | 2018-01-03 15:13:14 -0800 | [diff] [blame] | 244 | if (server_version != TLS1_2_VERSION) { |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 245 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 246 | OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_VERSION_NUMBER); |
| 247 | return ssl_hs_error; |
| 248 | } |
| 249 | |
Robert Sloan | 99319a1 | 2017-11-27 10:32:46 -0800 | [diff] [blame] | 250 | // Forbid a second HelloRetryRequest. |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 251 | if (CBS_mem_equal(&server_random, kHelloRetryRequest, SSL3_RANDOM_SIZE)) { |
Robert Sloan | 99319a1 | 2017-11-27 10:32:46 -0800 | [diff] [blame] | 252 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); |
| 253 | OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_MESSAGE); |
| 254 | return ssl_hs_error; |
| 255 | } |
| 256 | |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 257 | OPENSSL_memcpy(ssl->s3->server_random, CBS_data(&server_random), |
| 258 | SSL3_RANDOM_SIZE); |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 259 | |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 260 | // Check if the cipher is a TLS 1.3 cipher. |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 261 | const SSL_CIPHER *cipher = SSL_get_cipher_by_value(cipher_suite); |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 262 | if (cipher == nullptr || |
| 263 | SSL_CIPHER_get_min_version(cipher) > ssl_protocol_version(ssl) || |
| 264 | SSL_CIPHER_get_max_version(cipher) < ssl_protocol_version(ssl)) { |
| 265 | OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CIPHER_RETURNED); |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 266 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 267 | return ssl_hs_error; |
| 268 | } |
| 269 | |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 270 | // Check that the cipher matches the one in the HelloRetryRequest. |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 271 | if (hs->received_hello_retry_request && |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 272 | hs->new_cipher != cipher) { |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 273 | OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CIPHER_RETURNED); |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 274 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 275 | return ssl_hs_error; |
| 276 | } |
| 277 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 278 | // Parse out the extensions. |
| 279 | bool have_key_share = false, have_pre_shared_key = false, |
| 280 | have_supported_versions = false; |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 281 | CBS key_share, pre_shared_key, supported_versions; |
Robert Sloan | 0db7f54 | 2018-01-16 15:48:33 -0800 | [diff] [blame] | 282 | SSL_EXTENSION_TYPE ext_types[] = { |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 283 | {TLSEXT_TYPE_key_share, &have_key_share, &key_share}, |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 284 | {TLSEXT_TYPE_pre_shared_key, &have_pre_shared_key, &pre_shared_key}, |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 285 | {TLSEXT_TYPE_supported_versions, &have_supported_versions, |
| 286 | &supported_versions}, |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 287 | }; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 288 | |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 289 | uint8_t alert = SSL_AD_DECODE_ERROR; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 290 | if (!ssl_parse_extensions(&extensions, &alert, ext_types, |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 291 | OPENSSL_ARRAY_SIZE(ext_types), |
| 292 | 0 /* reject unknown */)) { |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 293 | ssl_send_alert(ssl, SSL3_AL_FATAL, alert); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 294 | return ssl_hs_error; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 295 | } |
| 296 | |
Robert Sloan | 4c22c5f | 2019-03-01 15:53:37 -0800 | [diff] [blame] | 297 | // Recheck supported_versions, in case this is the second ServerHello. |
| 298 | uint16_t version; |
| 299 | if (!have_supported_versions || |
| 300 | !CBS_get_u16(&supported_versions, &version) || |
| 301 | version != ssl->version) { |
| 302 | OPENSSL_PUT_ERROR(SSL, SSL_R_SECOND_SERVERHELLO_VERSION_MISMATCH); |
| 303 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); |
| 304 | return ssl_hs_error; |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 305 | } |
| 306 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 307 | alert = SSL_AD_DECODE_ERROR; |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 308 | if (have_pre_shared_key) { |
| 309 | if (ssl->session == NULL) { |
| 310 | OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_EXTENSION); |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 311 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNSUPPORTED_EXTENSION); |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 312 | return ssl_hs_error; |
| 313 | } |
| 314 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 315 | if (!ssl_ext_pre_shared_key_parse_serverhello(hs, &alert, |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 316 | &pre_shared_key)) { |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 317 | ssl_send_alert(ssl, SSL3_AL_FATAL, alert); |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 318 | return ssl_hs_error; |
| 319 | } |
| 320 | |
| 321 | if (ssl->session->ssl_version != ssl->version) { |
| 322 | OPENSSL_PUT_ERROR(SSL, SSL_R_OLD_SESSION_VERSION_NOT_RETURNED); |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 323 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 324 | return ssl_hs_error; |
| 325 | } |
| 326 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 327 | if (ssl->session->cipher->algorithm_prf != cipher->algorithm_prf) { |
| 328 | OPENSSL_PUT_ERROR(SSL, SSL_R_OLD_SESSION_PRF_HASH_MISMATCH); |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 329 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 330 | return ssl_hs_error; |
| 331 | } |
| 332 | |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 333 | if (!ssl_session_is_context_valid(hs, ssl->session.get())) { |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 334 | // This is actually a client application bug. |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 335 | OPENSSL_PUT_ERROR(SSL, |
| 336 | SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 337 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 338 | return ssl_hs_error; |
| 339 | } |
| 340 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 341 | ssl->s3->session_reused = true; |
| 342 | // Only authentication information carries over in TLS 1.3. |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 343 | hs->new_session = |
| 344 | SSL_SESSION_dup(ssl->session.get(), SSL_SESSION_DUP_AUTH_ONLY); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 345 | if (!hs->new_session) { |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 346 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 347 | return ssl_hs_error; |
| 348 | } |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 349 | ssl_set_session(ssl, NULL); |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 350 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 351 | // Resumption incorporates fresh key material, so refresh the timeout. |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 352 | ssl_session_renew_timeout(ssl, hs->new_session.get(), |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 353 | ssl->session_ctx->session_psk_dhe_timeout); |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 354 | } else if (!ssl_get_new_session(hs, 0)) { |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 355 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 356 | return ssl_hs_error; |
| 357 | } |
| 358 | |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 359 | hs->new_session->cipher = cipher; |
| 360 | hs->new_cipher = cipher; |
| 361 | |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 362 | size_t hash_len = |
| 363 | EVP_MD_size(ssl_get_handshake_digest(ssl_protocol_version(ssl), cipher)); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 364 | |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 365 | // Set up the key schedule and incorporate the PSK into the running secret. |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 366 | if (ssl->s3->session_reused) { |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 367 | if (!tls13_init_key_schedule(hs, hs->new_session->master_key, |
| 368 | hs->new_session->master_key_length)) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 369 | return ssl_hs_error; |
| 370 | } |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 371 | } else if (!tls13_init_key_schedule(hs, kZeroes, hash_len)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 372 | return ssl_hs_error; |
| 373 | } |
| 374 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 375 | if (!have_key_share) { |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 376 | // We do not support psk_ke and thus always require a key share. |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 377 | OPENSSL_PUT_ERROR(SSL, SSL_R_MISSING_KEY_SHARE); |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 378 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_MISSING_EXTENSION); |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 379 | return ssl_hs_error; |
| 380 | } |
| 381 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 382 | // Resolve ECDHE and incorporate it into the secret. |
Robert Sloan | 4562e9d | 2017-10-02 10:26:51 -0700 | [diff] [blame] | 383 | Array<uint8_t> dhe_secret; |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 384 | alert = SSL_AD_DECODE_ERROR; |
Robert Sloan | 4562e9d | 2017-10-02 10:26:51 -0700 | [diff] [blame] | 385 | if (!ssl_ext_key_share_parse_serverhello(hs, &dhe_secret, &alert, |
| 386 | &key_share)) { |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 387 | ssl_send_alert(ssl, SSL3_AL_FATAL, alert); |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 388 | return ssl_hs_error; |
| 389 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 390 | |
Robert Sloan | 4562e9d | 2017-10-02 10:26:51 -0700 | [diff] [blame] | 391 | if (!tls13_advance_key_schedule(hs, dhe_secret.data(), dhe_secret.size()) || |
Robert Sloan | cbf5ea6 | 2018-11-05 11:56:34 -0800 | [diff] [blame] | 392 | !ssl_hash_message(hs, msg) || !tls13_derive_handshake_secrets(hs) || |
| 393 | !tls13_set_traffic_key(ssl, ssl_encryption_handshake, evp_aead_open, |
| 394 | hs->server_handshake_secret, hs->hash_len)) { |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 395 | return ssl_hs_error; |
| 396 | } |
| 397 | |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 398 | if (!hs->early_data_offered) { |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 399 | // If not sending early data, set client traffic keys now so that alerts are |
| 400 | // encrypted. |
Robert Sloan | cbf5ea6 | 2018-11-05 11:56:34 -0800 | [diff] [blame] | 401 | if (!tls13_set_traffic_key(ssl, ssl_encryption_handshake, evp_aead_seal, |
| 402 | hs->client_handshake_secret, hs->hash_len)) { |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 403 | return ssl_hs_error; |
| 404 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 405 | } |
| 406 | |
Robert Sloan | d5c2215 | 2017-11-13 09:22:12 -0800 | [diff] [blame] | 407 | ssl->method->next_message(ssl); |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 408 | hs->tls13_state = state_read_encrypted_extensions; |
| 409 | return ssl_hs_ok; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 410 | } |
| 411 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 412 | static enum ssl_hs_wait_t do_read_encrypted_extensions(SSL_HANDSHAKE *hs) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 413 | SSL *const ssl = hs->ssl; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 414 | SSLMessage msg; |
| 415 | if (!ssl->method->get_message(ssl, &msg)) { |
| 416 | return ssl_hs_read_message; |
| 417 | } |
| 418 | if (!ssl_check_message_type(ssl, msg, SSL3_MT_ENCRYPTED_EXTENSIONS)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 419 | return ssl_hs_error; |
| 420 | } |
| 421 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 422 | CBS body = msg.body; |
| 423 | if (!ssl_parse_serverhello_tlsext(hs, &body)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 424 | OPENSSL_PUT_ERROR(SSL, SSL_R_PARSE_TLSEXT); |
| 425 | return ssl_hs_error; |
| 426 | } |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 427 | if (CBS_len(&body) != 0) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 428 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 429 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 430 | return ssl_hs_error; |
| 431 | } |
| 432 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 433 | // Store the negotiated ALPN in the session. |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 434 | if (!hs->new_session->early_alpn.CopyFrom(ssl->s3->alpn_selected)) { |
| 435 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 436 | return ssl_hs_error; |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 437 | } |
| 438 | |
Robert Sloan | 0da4395 | 2018-01-03 15:13:14 -0800 | [diff] [blame] | 439 | if (ssl->s3->early_data_accepted) { |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 440 | if (hs->early_session->cipher != hs->new_session->cipher || |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 441 | MakeConstSpan(hs->early_session->early_alpn) != |
Robert Sloan | 29c1d2c | 2017-10-30 14:10:28 -0700 | [diff] [blame] | 442 | ssl->s3->alpn_selected) { |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 443 | OPENSSL_PUT_ERROR(SSL, SSL_R_ALPN_MISMATCH_ON_EARLY_DATA); |
| 444 | return ssl_hs_error; |
| 445 | } |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 446 | if (ssl->s3->channel_id_valid || ssl->s3->token_binding_negotiated) { |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 447 | OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_EXTENSION_ON_EARLY_DATA); |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 448 | return ssl_hs_error; |
| 449 | } |
| 450 | } |
| 451 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 452 | if (!ssl_hash_message(hs, msg)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 453 | return ssl_hs_error; |
| 454 | } |
| 455 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 456 | ssl->method->next_message(ssl); |
| 457 | hs->tls13_state = state_read_certificate_request; |
Robert Sloan | 0da4395 | 2018-01-03 15:13:14 -0800 | [diff] [blame] | 458 | if (hs->in_early_data && !ssl->s3->early_data_accepted) { |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 459 | return ssl_hs_early_data_rejected; |
| 460 | } |
| 461 | return ssl_hs_ok; |
| 462 | } |
| 463 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 464 | static enum ssl_hs_wait_t do_read_certificate_request(SSL_HANDSHAKE *hs) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 465 | SSL *const ssl = hs->ssl; |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 466 | // CertificateRequest may only be sent in non-resumption handshakes. |
Steven Valdez | bb1ceac | 2016-10-07 10:34:51 -0400 | [diff] [blame] | 467 | if (ssl->s3->session_reused) { |
Robert Sloan | c9abfe4 | 2018-11-26 12:19:07 -0800 | [diff] [blame] | 468 | if (ssl->ctx->reverify_on_resume && !ssl->s3->early_data_accepted) { |
Robert Sloan | d9e572d | 2018-08-27 12:27:00 -0700 | [diff] [blame] | 469 | hs->tls13_state = state_server_certificate_reverify; |
| 470 | return ssl_hs_ok; |
| 471 | } |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 472 | hs->tls13_state = state_read_server_finished; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 473 | return ssl_hs_ok; |
| 474 | } |
| 475 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 476 | SSLMessage msg; |
| 477 | if (!ssl->method->get_message(ssl, &msg)) { |
| 478 | return ssl_hs_read_message; |
| 479 | } |
| 480 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 481 | // CertificateRequest is optional. |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 482 | if (msg.type != SSL3_MT_CERTIFICATE_REQUEST) { |
| 483 | hs->tls13_state = state_read_server_certificate; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 484 | return ssl_hs_ok; |
| 485 | } |
| 486 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 487 | |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 488 | bool have_sigalgs = false, have_ca = false; |
| 489 | CBS sigalgs, ca; |
| 490 | const SSL_EXTENSION_TYPE ext_types[] = { |
| 491 | {TLSEXT_TYPE_signature_algorithms, &have_sigalgs, &sigalgs}, |
| 492 | {TLSEXT_TYPE_certificate_authorities, &have_ca, &ca}, |
| 493 | }; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 494 | |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 495 | CBS body = msg.body, context, extensions, supported_signature_algorithms; |
| 496 | uint8_t alert = SSL_AD_DECODE_ERROR; |
| 497 | if (!CBS_get_u8_length_prefixed(&body, &context) || |
| 498 | // The request context is always empty during the handshake. |
| 499 | CBS_len(&context) != 0 || |
| 500 | !CBS_get_u16_length_prefixed(&body, &extensions) || |
| 501 | CBS_len(&body) != 0 || |
| 502 | !ssl_parse_extensions(&extensions, &alert, ext_types, |
| 503 | OPENSSL_ARRAY_SIZE(ext_types), |
| 504 | 1 /* accept unknown */) || |
| 505 | (have_ca && CBS_len(&ca) == 0) || |
| 506 | !have_sigalgs || |
| 507 | !CBS_get_u16_length_prefixed(&sigalgs, |
| 508 | &supported_signature_algorithms) || |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 509 | !tls1_parse_peer_sigalgs(hs, &supported_signature_algorithms)) { |
| 510 | ssl_send_alert(ssl, SSL3_AL_FATAL, alert); |
| 511 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 512 | return ssl_hs_error; |
| 513 | } |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 514 | |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 515 | if (have_ca) { |
| 516 | hs->ca_names = ssl_parse_client_CA_list(ssl, &alert, &ca); |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 517 | if (!hs->ca_names) { |
| 518 | ssl_send_alert(ssl, SSL3_AL_FATAL, alert); |
| 519 | return ssl_hs_error; |
| 520 | } |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 521 | } else { |
| 522 | hs->ca_names.reset(sk_CRYPTO_BUFFER_new_null()); |
| 523 | if (!hs->ca_names) { |
| 524 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
| 525 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 526 | return ssl_hs_error; |
| 527 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 528 | } |
| 529 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 530 | hs->cert_request = true; |
Robert Sloan | 7d422bc | 2017-03-06 10:04:29 -0800 | [diff] [blame] | 531 | ssl->ctx->x509_method->hs_flush_cached_ca_names(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 532 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 533 | if (!ssl_hash_message(hs, msg)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 534 | return ssl_hs_error; |
| 535 | } |
| 536 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 537 | ssl->method->next_message(ssl); |
| 538 | hs->tls13_state = state_read_server_certificate; |
| 539 | return ssl_hs_ok; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 540 | } |
| 541 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 542 | static enum ssl_hs_wait_t do_read_server_certificate(SSL_HANDSHAKE *hs) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 543 | SSL *const ssl = hs->ssl; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 544 | SSLMessage msg; |
| 545 | if (!ssl->method->get_message(ssl, &msg)) { |
| 546 | return ssl_hs_read_message; |
| 547 | } |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 548 | |
| 549 | if (msg.type != SSL3_MT_COMPRESSED_CERTIFICATE && |
| 550 | !ssl_check_message_type(ssl, msg, SSL3_MT_CERTIFICATE)) { |
| 551 | return ssl_hs_error; |
| 552 | } |
| 553 | |
Robert Sloan | 726e9d1 | 2018-09-11 11:45:04 -0700 | [diff] [blame] | 554 | if (!tls13_process_certificate(hs, msg, false /* certificate required */) || |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 555 | !ssl_hash_message(hs, msg)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 556 | return ssl_hs_error; |
| 557 | } |
| 558 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 559 | ssl->method->next_message(ssl); |
| 560 | hs->tls13_state = state_read_server_certificate_verify; |
| 561 | return ssl_hs_ok; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 562 | } |
| 563 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 564 | static enum ssl_hs_wait_t do_read_server_certificate_verify( |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 565 | SSL_HANDSHAKE *hs) { |
| 566 | SSL *const ssl = hs->ssl; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 567 | SSLMessage msg; |
| 568 | if (!ssl->method->get_message(ssl, &msg)) { |
| 569 | return ssl_hs_read_message; |
| 570 | } |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 571 | switch (ssl_verify_peer_cert(hs)) { |
| 572 | case ssl_verify_ok: |
| 573 | break; |
| 574 | case ssl_verify_invalid: |
| 575 | return ssl_hs_error; |
| 576 | case ssl_verify_retry: |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 577 | hs->tls13_state = state_read_server_certificate_verify; |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 578 | return ssl_hs_certificate_verify; |
| 579 | } |
| 580 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 581 | if (!ssl_check_message_type(ssl, msg, SSL3_MT_CERTIFICATE_VERIFY) || |
| 582 | !tls13_process_certificate_verify(hs, msg) || |
| 583 | !ssl_hash_message(hs, msg)) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 584 | return ssl_hs_error; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 585 | } |
| 586 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 587 | ssl->method->next_message(ssl); |
| 588 | hs->tls13_state = state_read_server_finished; |
| 589 | return ssl_hs_ok; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 590 | } |
| 591 | |
Robert Sloan | d9e572d | 2018-08-27 12:27:00 -0700 | [diff] [blame] | 592 | static enum ssl_hs_wait_t do_server_certificate_reverify( |
| 593 | SSL_HANDSHAKE *hs) { |
| 594 | switch (ssl_reverify_peer_cert(hs)) { |
| 595 | case ssl_verify_ok: |
| 596 | break; |
| 597 | case ssl_verify_invalid: |
| 598 | return ssl_hs_error; |
| 599 | case ssl_verify_retry: |
| 600 | hs->tls13_state = state_server_certificate_reverify; |
| 601 | return ssl_hs_certificate_verify; |
| 602 | } |
| 603 | hs->tls13_state = state_read_server_finished; |
| 604 | return ssl_hs_ok; |
| 605 | } |
| 606 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 607 | static enum ssl_hs_wait_t do_read_server_finished(SSL_HANDSHAKE *hs) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 608 | SSL *const ssl = hs->ssl; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 609 | SSLMessage msg; |
| 610 | if (!ssl->method->get_message(ssl, &msg)) { |
| 611 | return ssl_hs_read_message; |
| 612 | } |
| 613 | if (!ssl_check_message_type(ssl, msg, SSL3_MT_FINISHED) || |
Robert Sloan | 726e9d1 | 2018-09-11 11:45:04 -0700 | [diff] [blame] | 614 | !tls13_process_finished(hs, msg, false /* don't use saved value */) || |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 615 | !ssl_hash_message(hs, msg) || |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 616 | // Update the secret to the master secret and derive traffic keys. |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 617 | !tls13_advance_key_schedule(hs, kZeroes, hs->hash_len) || |
| 618 | !tls13_derive_application_secrets(hs)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 619 | return ssl_hs_error; |
| 620 | } |
| 621 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 622 | ssl->method->next_message(ssl); |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 623 | hs->tls13_state = state_send_end_of_early_data; |
| 624 | return ssl_hs_ok; |
| 625 | } |
| 626 | |
| 627 | static enum ssl_hs_wait_t do_send_end_of_early_data(SSL_HANDSHAKE *hs) { |
| 628 | SSL *const ssl = hs->ssl; |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 629 | |
Robert Sloan | 0da4395 | 2018-01-03 15:13:14 -0800 | [diff] [blame] | 630 | if (ssl->s3->early_data_accepted) { |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 631 | hs->can_early_write = false; |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 632 | ScopedCBB cbb; |
| 633 | CBB body; |
| 634 | if (!ssl->method->init_message(ssl, cbb.get(), &body, |
| 635 | SSL3_MT_END_OF_EARLY_DATA) || |
| 636 | !ssl_add_message_cbb(ssl, cbb.get())) { |
| 637 | return ssl_hs_error; |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 638 | } |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 639 | } |
| 640 | |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 641 | if (hs->early_data_offered) { |
Robert Sloan | cbf5ea6 | 2018-11-05 11:56:34 -0800 | [diff] [blame] | 642 | if (!tls13_set_traffic_key(ssl, ssl_encryption_handshake, evp_aead_seal, |
| 643 | hs->client_handshake_secret, hs->hash_len)) { |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 644 | return ssl_hs_error; |
| 645 | } |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 646 | } |
| 647 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 648 | hs->tls13_state = state_send_client_certificate; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 649 | return ssl_hs_ok; |
| 650 | } |
| 651 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 652 | static enum ssl_hs_wait_t do_send_client_certificate(SSL_HANDSHAKE *hs) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 653 | SSL *const ssl = hs->ssl; |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 654 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 655 | // The peer didn't request a certificate. |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 656 | if (!hs->cert_request) { |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 657 | hs->tls13_state = state_complete_second_flight; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 658 | return ssl_hs_ok; |
| 659 | } |
| 660 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 661 | // Call cert_cb to update the certificate. |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 662 | if (hs->config->cert->cert_cb != NULL) { |
| 663 | int rv = hs->config->cert->cert_cb(ssl, hs->config->cert->cert_cb_arg); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 664 | if (rv == 0) { |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 665 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 666 | OPENSSL_PUT_ERROR(SSL, SSL_R_CERT_CB_ERROR); |
| 667 | return ssl_hs_error; |
| 668 | } |
| 669 | if (rv < 0) { |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 670 | hs->tls13_state = state_send_client_certificate; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 671 | return ssl_hs_x509_lookup; |
| 672 | } |
| 673 | } |
| 674 | |
Robert Sloan | 572a4e2 | 2017-04-17 10:52:19 -0700 | [diff] [blame] | 675 | if (!ssl_on_certificate_selected(hs) || |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 676 | !tls13_add_certificate(hs)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 677 | return ssl_hs_error; |
| 678 | } |
| 679 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 680 | hs->tls13_state = state_send_client_certificate_verify; |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 681 | return ssl_hs_ok; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 682 | } |
| 683 | |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 684 | static enum ssl_hs_wait_t do_send_client_certificate_verify(SSL_HANDSHAKE *hs) { |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 685 | // Don't send CertificateVerify if there is no certificate. |
Robert Sloan | 4c22c5f | 2019-03-01 15:53:37 -0800 | [diff] [blame] | 686 | if (!ssl_has_certificate(hs)) { |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 687 | hs->tls13_state = state_complete_second_flight; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 688 | return ssl_hs_ok; |
| 689 | } |
| 690 | |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 691 | switch (tls13_add_certificate_verify(hs)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 692 | case ssl_private_key_success: |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 693 | hs->tls13_state = state_complete_second_flight; |
| 694 | return ssl_hs_ok; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 695 | |
| 696 | case ssl_private_key_retry: |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 697 | hs->tls13_state = state_send_client_certificate_verify; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 698 | return ssl_hs_private_key_operation; |
| 699 | |
| 700 | case ssl_private_key_failure: |
| 701 | return ssl_hs_error; |
| 702 | } |
| 703 | |
| 704 | assert(0); |
| 705 | return ssl_hs_error; |
| 706 | } |
| 707 | |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 708 | static enum ssl_hs_wait_t do_complete_second_flight(SSL_HANDSHAKE *hs) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 709 | SSL *const ssl = hs->ssl; |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 710 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 711 | // Send a Channel ID assertion if necessary. |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 712 | if (ssl->s3->channel_id_valid) { |
| 713 | if (!ssl_do_channel_id_callback(hs)) { |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 714 | hs->tls13_state = state_complete_second_flight; |
| 715 | return ssl_hs_error; |
| 716 | } |
| 717 | |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 718 | if (hs->config->channel_id_private == NULL) { |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 719 | return ssl_hs_channel_id_lookup; |
| 720 | } |
| 721 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 722 | ScopedCBB cbb; |
| 723 | CBB body; |
| 724 | if (!ssl->method->init_message(ssl, cbb.get(), &body, SSL3_MT_CHANNEL_ID) || |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 725 | !tls1_write_channel_id(hs, &body) || |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 726 | !ssl_add_message_cbb(ssl, cbb.get())) { |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 727 | return ssl_hs_error; |
| 728 | } |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 729 | } |
| 730 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 731 | // Send a Finished message. |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 732 | if (!tls13_add_finished(hs)) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 733 | return ssl_hs_error; |
| 734 | } |
| 735 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 736 | // Derive the final keys and enable them. |
Robert Sloan | cbf5ea6 | 2018-11-05 11:56:34 -0800 | [diff] [blame] | 737 | if (!tls13_set_traffic_key(ssl, ssl_encryption_application, evp_aead_open, |
| 738 | hs->server_traffic_secret_0, hs->hash_len) || |
| 739 | !tls13_set_traffic_key(ssl, ssl_encryption_application, evp_aead_seal, |
| 740 | hs->client_traffic_secret_0, hs->hash_len) || |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 741 | !tls13_derive_resumption_secret(hs)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 742 | return ssl_hs_error; |
| 743 | } |
| 744 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 745 | hs->tls13_state = state_done; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 746 | return ssl_hs_flush; |
| 747 | } |
| 748 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 749 | enum ssl_hs_wait_t tls13_client_handshake(SSL_HANDSHAKE *hs) { |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 750 | while (hs->tls13_state != state_done) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 751 | enum ssl_hs_wait_t ret = ssl_hs_error; |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 752 | enum client_hs_state_t state = |
| 753 | static_cast<enum client_hs_state_t>(hs->tls13_state); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 754 | switch (state) { |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 755 | case state_read_hello_retry_request: |
| 756 | ret = do_read_hello_retry_request(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 757 | break; |
| 758 | case state_send_second_client_hello: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 759 | ret = do_send_second_client_hello(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 760 | break; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 761 | case state_read_server_hello: |
| 762 | ret = do_read_server_hello(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 763 | break; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 764 | case state_read_encrypted_extensions: |
| 765 | ret = do_read_encrypted_extensions(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 766 | break; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 767 | case state_read_certificate_request: |
| 768 | ret = do_read_certificate_request(hs); |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 769 | break; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 770 | case state_read_server_certificate: |
| 771 | ret = do_read_server_certificate(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 772 | break; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 773 | case state_read_server_certificate_verify: |
| 774 | ret = do_read_server_certificate_verify(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 775 | break; |
Robert Sloan | d9e572d | 2018-08-27 12:27:00 -0700 | [diff] [blame] | 776 | case state_server_certificate_reverify: |
| 777 | ret = do_server_certificate_reverify(hs); |
| 778 | break; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 779 | case state_read_server_finished: |
| 780 | ret = do_read_server_finished(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 781 | break; |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 782 | case state_send_end_of_early_data: |
| 783 | ret = do_send_end_of_early_data(hs); |
| 784 | break; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 785 | case state_send_client_certificate: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 786 | ret = do_send_client_certificate(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 787 | break; |
| 788 | case state_send_client_certificate_verify: |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 789 | ret = do_send_client_certificate_verify(hs); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 790 | break; |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 791 | case state_complete_second_flight: |
| 792 | ret = do_complete_second_flight(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 793 | break; |
| 794 | case state_done: |
| 795 | ret = ssl_hs_ok; |
| 796 | break; |
| 797 | } |
| 798 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 799 | if (hs->tls13_state != state) { |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 800 | ssl_do_info_callback(hs->ssl, SSL_CB_CONNECT_LOOP, 1); |
| 801 | } |
| 802 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 803 | if (ret != ssl_hs_ok) { |
| 804 | return ret; |
| 805 | } |
| 806 | } |
| 807 | |
| 808 | return ssl_hs_ok; |
| 809 | } |
| 810 | |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 811 | const char *tls13_client_handshake_state(SSL_HANDSHAKE *hs) { |
| 812 | enum client_hs_state_t state = |
| 813 | static_cast<enum client_hs_state_t>(hs->tls13_state); |
| 814 | switch (state) { |
| 815 | case state_read_hello_retry_request: |
| 816 | return "TLS 1.3 client read_hello_retry_request"; |
| 817 | case state_send_second_client_hello: |
| 818 | return "TLS 1.3 client send_second_client_hello"; |
| 819 | case state_read_server_hello: |
| 820 | return "TLS 1.3 client read_server_hello"; |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 821 | case state_read_encrypted_extensions: |
| 822 | return "TLS 1.3 client read_encrypted_extensions"; |
| 823 | case state_read_certificate_request: |
| 824 | return "TLS 1.3 client read_certificate_request"; |
| 825 | case state_read_server_certificate: |
| 826 | return "TLS 1.3 client read_server_certificate"; |
| 827 | case state_read_server_certificate_verify: |
| 828 | return "TLS 1.3 client read_server_certificate_verify"; |
Robert Sloan | d9e572d | 2018-08-27 12:27:00 -0700 | [diff] [blame] | 829 | case state_server_certificate_reverify: |
| 830 | return "TLS 1.3 client server_certificate_reverify"; |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 831 | case state_read_server_finished: |
| 832 | return "TLS 1.3 client read_server_finished"; |
| 833 | case state_send_end_of_early_data: |
| 834 | return "TLS 1.3 client send_end_of_early_data"; |
| 835 | case state_send_client_certificate: |
| 836 | return "TLS 1.3 client send_client_certificate"; |
| 837 | case state_send_client_certificate_verify: |
| 838 | return "TLS 1.3 client send_client_certificate_verify"; |
| 839 | case state_complete_second_flight: |
| 840 | return "TLS 1.3 client complete_second_flight"; |
| 841 | case state_done: |
| 842 | return "TLS 1.3 client done"; |
| 843 | } |
| 844 | |
| 845 | return "TLS 1.3 client unknown"; |
| 846 | } |
| 847 | |
Robert Sloan | 726e9d1 | 2018-09-11 11:45:04 -0700 | [diff] [blame] | 848 | bool tls13_process_new_session_ticket(SSL *ssl, const SSLMessage &msg) { |
Robert Sloan | 3627296 | 2017-10-23 10:28:39 -0700 | [diff] [blame] | 849 | if (ssl->s3->write_shutdown != ssl_shutdown_none) { |
| 850 | // Ignore tickets on shutdown. Callers tend to indiscriminately call |
| 851 | // |SSL_shutdown| before destroying an |SSL|, at which point calling the new |
| 852 | // session callback may be confusing. |
Robert Sloan | 726e9d1 | 2018-09-11 11:45:04 -0700 | [diff] [blame] | 853 | return true; |
Robert Sloan | 3627296 | 2017-10-23 10:28:39 -0700 | [diff] [blame] | 854 | } |
| 855 | |
Robert Sloan | 29c1d2c | 2017-10-30 14:10:28 -0700 | [diff] [blame] | 856 | UniquePtr<SSL_SESSION> session = SSL_SESSION_dup( |
| 857 | ssl->s3->established_session.get(), SSL_SESSION_INCLUDE_NONAUTH); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 858 | if (!session) { |
Robert Sloan | 726e9d1 | 2018-09-11 11:45:04 -0700 | [diff] [blame] | 859 | return false; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 860 | } |
| 861 | |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 862 | ssl_session_rebase_time(ssl, session.get()); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 863 | |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 864 | uint32_t server_timeout; |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 865 | CBS body = msg.body, ticket_nonce, ticket, extensions; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 866 | if (!CBS_get_u32(&body, &server_timeout) || |
| 867 | !CBS_get_u32(&body, &session->ticket_age_add) || |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 868 | !CBS_get_u8_length_prefixed(&body, &ticket_nonce) || |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 869 | !CBS_get_u16_length_prefixed(&body, &ticket) || |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 870 | !session->ticket.CopyFrom(ticket) || |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 871 | !CBS_get_u16_length_prefixed(&body, &extensions) || |
| 872 | CBS_len(&body) != 0) { |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 873 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 874 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
Robert Sloan | 726e9d1 | 2018-09-11 11:45:04 -0700 | [diff] [blame] | 875 | return false; |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 876 | } |
| 877 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 878 | // Cap the renewable lifetime by the server advertised value. This avoids |
| 879 | // wasting bandwidth on 0-RTT when we know the server will reject it. |
Robert Sloan | 7d422bc | 2017-03-06 10:04:29 -0800 | [diff] [blame] | 880 | if (session->timeout > server_timeout) { |
| 881 | session->timeout = server_timeout; |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 882 | } |
| 883 | |
Robert Sloan | 4c22c5f | 2019-03-01 15:53:37 -0800 | [diff] [blame] | 884 | if (!tls13_derive_session_psk(session.get(), ticket_nonce)) { |
Robert Sloan | 726e9d1 | 2018-09-11 11:45:04 -0700 | [diff] [blame] | 885 | return false; |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 886 | } |
| 887 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 888 | // Parse out the extensions. |
| 889 | bool have_early_data_info = false; |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 890 | CBS early_data_info; |
| 891 | const SSL_EXTENSION_TYPE ext_types[] = { |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 892 | {TLSEXT_TYPE_early_data, &have_early_data_info, &early_data_info}, |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 893 | }; |
| 894 | |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 895 | uint8_t alert = SSL_AD_DECODE_ERROR; |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 896 | if (!ssl_parse_extensions(&extensions, &alert, ext_types, |
| 897 | OPENSSL_ARRAY_SIZE(ext_types), |
| 898 | 1 /* ignore unknown */)) { |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 899 | ssl_send_alert(ssl, SSL3_AL_FATAL, alert); |
Robert Sloan | 726e9d1 | 2018-09-11 11:45:04 -0700 | [diff] [blame] | 900 | return false; |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 901 | } |
| 902 | |
Srinivas Paladugu | dd42a61 | 2019-08-09 19:30:39 +0000 | [diff] [blame^] | 903 | if (have_early_data_info && ssl->enable_early_data) { |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 904 | if (!CBS_get_u32(&early_data_info, &session->ticket_max_early_data) || |
| 905 | CBS_len(&early_data_info) != 0) { |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 906 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 907 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
Robert Sloan | 726e9d1 | 2018-09-11 11:45:04 -0700 | [diff] [blame] | 908 | return false; |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 909 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 910 | } |
| 911 | |
Robert Sloan | 726e9d1 | 2018-09-11 11:45:04 -0700 | [diff] [blame] | 912 | // Generate a session ID for this session. Some callers expect all sessions to |
| 913 | // have a session ID. |
| 914 | SHA256(CBS_data(&ticket), CBS_len(&ticket), session->session_id); |
| 915 | session->session_id_length = SHA256_DIGEST_LENGTH; |
| 916 | |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 917 | session->ticket_age_add_valid = true; |
| 918 | session->not_resumable = false; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 919 | |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 920 | if ((ssl->session_ctx->session_cache_mode & SSL_SESS_CACHE_CLIENT) && |
| 921 | ssl->session_ctx->new_session_cb != NULL && |
| 922 | ssl->session_ctx->new_session_cb(ssl, session.get())) { |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 923 | // |new_session_cb|'s return value signals that it took ownership. |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 924 | session.release(); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 925 | } |
| 926 | |
Robert Sloan | 726e9d1 | 2018-09-11 11:45:04 -0700 | [diff] [blame] | 927 | return true; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 928 | } |
David Benjamin | 7c0d06c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 929 | |
Robert Sloan | 726e9d1 | 2018-09-11 11:45:04 -0700 | [diff] [blame] | 930 | BSSL_NAMESPACE_END |