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> |
| 18 | #include <string.h> |
| 19 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 20 | #include <utility> |
| 21 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 22 | #include <openssl/bytestring.h> |
| 23 | #include <openssl/err.h> |
| 24 | #include <openssl/hkdf.h> |
| 25 | #include <openssl/mem.h> |
| 26 | #include <openssl/stack.h> |
| 27 | #include <openssl/x509.h> |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 28 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 29 | #include "../crypto/internal.h" |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 30 | #include "internal.h" |
| 31 | |
| 32 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 33 | namespace bssl { |
| 34 | |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 35 | /* kMaxKeyUpdates is the number of consecutive KeyUpdates that will be |
| 36 | * processed. Without this limit an attacker could force unbounded processing |
| 37 | * without being able to return application data. */ |
| 38 | static const uint8_t kMaxKeyUpdates = 32; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 39 | |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 40 | int tls13_handshake(SSL_HANDSHAKE *hs, int *out_early_return) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 41 | SSL *const ssl = hs->ssl; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 42 | for (;;) { |
| 43 | /* Resolve the operation the handshake was waiting on. */ |
| 44 | switch (hs->wait) { |
| 45 | case ssl_hs_error: |
| 46 | OPENSSL_PUT_ERROR(SSL, SSL_R_SSL_HANDSHAKE_FAILURE); |
| 47 | return -1; |
| 48 | |
| 49 | case ssl_hs_flush: |
| 50 | case ssl_hs_flush_and_read_message: { |
David Benjamin | f31229b | 2017-01-25 14:08:15 -0500 | [diff] [blame] | 51 | int ret = ssl->method->flush_flight(ssl); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 52 | if (ret <= 0) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 53 | return ret; |
| 54 | } |
| 55 | if (hs->wait != ssl_hs_flush_and_read_message) { |
| 56 | break; |
| 57 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 58 | hs->wait = ssl_hs_read_message; |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 59 | SSL_FALLTHROUGH; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 60 | } |
| 61 | |
| 62 | case ssl_hs_read_message: { |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 63 | int ret = ssl->method->ssl_get_message(ssl); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 64 | if (ret <= 0) { |
| 65 | return ret; |
| 66 | } |
| 67 | break; |
| 68 | } |
| 69 | |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 70 | case ssl_hs_read_change_cipher_spec: { |
| 71 | int ret = ssl->method->read_change_cipher_spec(ssl); |
| 72 | if (ret <= 0) { |
| 73 | return ret; |
| 74 | } |
| 75 | break; |
| 76 | } |
| 77 | |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 78 | case ssl_hs_read_end_of_early_data: { |
| 79 | if (ssl->s3->hs->can_early_read) { |
| 80 | /* While we are processing early data, the handshake returns early. */ |
| 81 | *out_early_return = 1; |
| 82 | return 1; |
| 83 | } |
| 84 | hs->wait = ssl_hs_ok; |
| 85 | break; |
| 86 | } |
| 87 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 88 | case ssl_hs_x509_lookup: |
| 89 | ssl->rwstate = SSL_X509_LOOKUP; |
| 90 | hs->wait = ssl_hs_ok; |
| 91 | return -1; |
| 92 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 93 | case ssl_hs_channel_id_lookup: |
| 94 | ssl->rwstate = SSL_CHANNEL_ID_LOOKUP; |
| 95 | hs->wait = ssl_hs_ok; |
| 96 | return -1; |
| 97 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 98 | case ssl_hs_private_key_operation: |
| 99 | ssl->rwstate = SSL_PRIVATE_KEY_OPERATION; |
| 100 | hs->wait = ssl_hs_ok; |
| 101 | return -1; |
| 102 | |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 103 | case ssl_hs_pending_ticket: |
| 104 | ssl->rwstate = SSL_PENDING_TICKET; |
| 105 | hs->wait = ssl_hs_ok; |
| 106 | return -1; |
| 107 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 108 | case ssl_hs_certificate_verify: |
| 109 | ssl->rwstate = SSL_CERTIFICATE_VERIFY; |
| 110 | hs->wait = ssl_hs_ok; |
| 111 | return -1; |
| 112 | |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 113 | case ssl_hs_early_data_rejected: |
| 114 | ssl->rwstate = SSL_EARLY_DATA_REJECTED; |
| 115 | /* Cause |SSL_write| to start failing immediately. */ |
| 116 | hs->can_early_write = 0; |
| 117 | return -1; |
| 118 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 119 | case ssl_hs_ok: |
| 120 | break; |
| 121 | } |
| 122 | |
| 123 | /* Run the state machine again. */ |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 124 | hs->wait = hs->do_tls13_handshake(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 125 | if (hs->wait == ssl_hs_error) { |
| 126 | /* Don't loop around to avoid a stray |SSL_R_SSL_HANDSHAKE_FAILURE| the |
| 127 | * first time around. */ |
| 128 | return -1; |
| 129 | } |
| 130 | if (hs->wait == ssl_hs_ok) { |
| 131 | /* The handshake has completed. */ |
| 132 | return 1; |
| 133 | } |
| 134 | |
| 135 | /* Otherwise, loop to the beginning and resolve what was blocking the |
| 136 | * handshake. */ |
| 137 | } |
| 138 | } |
| 139 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 140 | int tls13_get_cert_verify_signature_input( |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 141 | SSL_HANDSHAKE *hs, uint8_t **out, size_t *out_len, |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 142 | enum ssl_cert_verify_context_t cert_verify_context) { |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 143 | ScopedCBB cbb; |
| 144 | if (!CBB_init(cbb.get(), 64 + 33 + 1 + 2 * EVP_MAX_MD_SIZE)) { |
| 145 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
| 146 | return 0; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 147 | } |
| 148 | |
| 149 | for (size_t i = 0; i < 64; i++) { |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 150 | if (!CBB_add_u8(cbb.get(), 0x20)) { |
| 151 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
| 152 | return 0; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 153 | } |
| 154 | } |
| 155 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 156 | const uint8_t *context; |
| 157 | size_t context_len; |
| 158 | if (cert_verify_context == ssl_cert_verify_server) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 159 | /* Include the NUL byte. */ |
| 160 | static const char kContext[] = "TLS 1.3, server CertificateVerify"; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 161 | context = (const uint8_t *)kContext; |
| 162 | context_len = sizeof(kContext); |
| 163 | } else if (cert_verify_context == ssl_cert_verify_client) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 164 | static const char kContext[] = "TLS 1.3, client CertificateVerify"; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 165 | context = (const uint8_t *)kContext; |
| 166 | context_len = sizeof(kContext); |
| 167 | } else if (cert_verify_context == ssl_cert_verify_channel_id) { |
| 168 | static const char kContext[] = "TLS 1.3, Channel ID"; |
| 169 | context = (const uint8_t *)kContext; |
| 170 | context_len = sizeof(kContext); |
| 171 | } else { |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 172 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
| 173 | return 0; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 174 | } |
| 175 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 176 | if (!CBB_add_bytes(cbb.get(), context, context_len)) { |
| 177 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
| 178 | return 0; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 179 | } |
| 180 | |
| 181 | uint8_t context_hash[EVP_MAX_MD_SIZE]; |
| 182 | size_t context_hash_len; |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 183 | if (!hs->transcript.GetHash(context_hash, &context_hash_len) || |
| 184 | !CBB_add_bytes(cbb.get(), context_hash, context_hash_len) || |
| 185 | !CBB_finish(cbb.get(), out, out_len)) { |
| 186 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
| 187 | return 0; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 188 | } |
| 189 | |
| 190 | return 1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 191 | } |
| 192 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 193 | int tls13_process_certificate(SSL_HANDSHAKE *hs, int allow_anonymous) { |
| 194 | SSL *const ssl = hs->ssl; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 195 | CBS cbs, context, certificate_list; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 196 | CBS_init(&cbs, ssl->init_msg, ssl->init_num); |
| 197 | if (!CBS_get_u8_length_prefixed(&cbs, &context) || |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame^] | 198 | CBS_len(&context) != 0 || |
| 199 | !CBS_get_u24_length_prefixed(&cbs, &certificate_list) || |
| 200 | CBS_len(&cbs) != 0) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 201 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 202 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 203 | return 0; |
| 204 | } |
| 205 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 206 | UniquePtr<STACK_OF(CRYPTO_BUFFER)> certs(sk_CRYPTO_BUFFER_new_null()); |
| 207 | if (!certs) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 208 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 209 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 210 | return 0; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 211 | } |
| 212 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 213 | const bool retain_sha256 = |
| 214 | ssl->server && ssl->retain_only_sha256_of_client_certs; |
| 215 | UniquePtr<EVP_PKEY> pkey; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 216 | while (CBS_len(&certificate_list) > 0) { |
| 217 | CBS certificate, extensions; |
| 218 | if (!CBS_get_u24_length_prefixed(&certificate_list, &certificate) || |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 219 | !CBS_get_u16_length_prefixed(&certificate_list, &extensions) || |
| 220 | CBS_len(&certificate) == 0) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 221 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 222 | OPENSSL_PUT_ERROR(SSL, SSL_R_CERT_LENGTH_MISMATCH); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 223 | return 0; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 224 | } |
| 225 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 226 | if (sk_CRYPTO_BUFFER_num(certs.get()) == 0) { |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 227 | pkey = ssl_cert_parse_pubkey(&certificate); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 228 | if (!pkey) { |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 229 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 230 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 231 | return 0; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 232 | } |
| 233 | /* TLS 1.3 always uses certificate keys for signing thus the correct |
| 234 | * keyUsage is enforced. */ |
| 235 | if (!ssl_cert_check_digital_signature_key_usage(&certificate)) { |
| 236 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 237 | return 0; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 238 | } |
| 239 | |
| 240 | if (retain_sha256) { |
| 241 | /* Retain the hash of the leaf certificate if requested. */ |
| 242 | SHA256(CBS_data(&certificate), CBS_len(&certificate), |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 243 | hs->new_session->peer_sha256); |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 244 | } |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 245 | } |
| 246 | |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame^] | 247 | UniquePtr<CRYPTO_BUFFER> buf( |
| 248 | CRYPTO_BUFFER_new_from_CBS(&certificate, ssl->ctx->pool)); |
| 249 | if (!buf || |
| 250 | !PushToStack(certs.get(), std::move(buf))) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 251 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 252 | OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 253 | return 0; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 254 | } |
| 255 | |
| 256 | /* Parse out the extensions. */ |
| 257 | int have_status_request = 0, have_sct = 0; |
| 258 | CBS status_request, sct; |
| 259 | const SSL_EXTENSION_TYPE ext_types[] = { |
| 260 | {TLSEXT_TYPE_status_request, &have_status_request, &status_request}, |
| 261 | {TLSEXT_TYPE_certificate_timestamp, &have_sct, &sct}, |
| 262 | }; |
| 263 | |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 264 | uint8_t alert = SSL_AD_DECODE_ERROR; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 265 | if (!ssl_parse_extensions(&extensions, &alert, ext_types, |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 266 | OPENSSL_ARRAY_SIZE(ext_types), |
| 267 | 0 /* reject unknown */)) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 268 | ssl3_send_alert(ssl, SSL3_AL_FATAL, alert); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 269 | return 0; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 270 | } |
| 271 | |
| 272 | /* All Certificate extensions are parsed, but only the leaf extensions are |
| 273 | * stored. */ |
| 274 | if (have_status_request) { |
| 275 | if (ssl->server || !ssl->ocsp_stapling_enabled) { |
| 276 | OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_EXTENSION); |
| 277 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNSUPPORTED_EXTENSION); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 278 | return 0; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 279 | } |
| 280 | |
| 281 | uint8_t status_type; |
| 282 | CBS ocsp_response; |
| 283 | if (!CBS_get_u8(&status_request, &status_type) || |
| 284 | status_type != TLSEXT_STATUSTYPE_ocsp || |
| 285 | !CBS_get_u24_length_prefixed(&status_request, &ocsp_response) || |
| 286 | CBS_len(&ocsp_response) == 0 || |
| 287 | CBS_len(&status_request) != 0) { |
| 288 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 289 | return 0; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 290 | } |
| 291 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 292 | if (sk_CRYPTO_BUFFER_num(certs.get()) == 1 && |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 293 | !CBS_stow(&ocsp_response, &hs->new_session->ocsp_response, |
| 294 | &hs->new_session->ocsp_response_length)) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 295 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 296 | return 0; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 297 | } |
| 298 | } |
| 299 | |
| 300 | if (have_sct) { |
| 301 | if (ssl->server || !ssl->signed_cert_timestamps_enabled) { |
| 302 | OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_EXTENSION); |
| 303 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNSUPPORTED_EXTENSION); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 304 | return 0; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 305 | } |
| 306 | |
| 307 | if (!ssl_is_sct_list_valid(&sct)) { |
| 308 | OPENSSL_PUT_ERROR(SSL, SSL_R_ERROR_PARSING_EXTENSION); |
| 309 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 310 | return 0; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 311 | } |
| 312 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 313 | if (sk_CRYPTO_BUFFER_num(certs.get()) == 1 && |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 314 | !CBS_stow( |
| 315 | &sct, &hs->new_session->tlsext_signed_cert_timestamp_list, |
| 316 | &hs->new_session->tlsext_signed_cert_timestamp_list_length)) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 317 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 318 | return 0; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 319 | } |
| 320 | } |
| 321 | } |
| 322 | |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame^] | 323 | /* Store a null certificate list rather than an empty one if the peer didn't |
| 324 | * send certificates. */ |
| 325 | if (sk_CRYPTO_BUFFER_num(certs.get()) == 0) { |
| 326 | certs.reset(); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 327 | } |
| 328 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 329 | hs->peer_pubkey = std::move(pkey); |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 330 | |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 331 | sk_CRYPTO_BUFFER_pop_free(hs->new_session->certs, CRYPTO_BUFFER_free); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 332 | hs->new_session->certs = certs.release(); |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 333 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 334 | if (!ssl->ctx->x509_method->session_cache_objects(hs->new_session.get())) { |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 335 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 336 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 337 | return 0; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 338 | } |
| 339 | |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 340 | if (sk_CRYPTO_BUFFER_num(hs->new_session->certs) == 0) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 341 | if (!allow_anonymous) { |
| 342 | OPENSSL_PUT_ERROR(SSL, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); |
David Benjamin | 95add82 | 2016-10-19 01:09:12 -0400 | [diff] [blame] | 343 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_CERTIFICATE_REQUIRED); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 344 | return 0; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 345 | } |
| 346 | |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 347 | /* OpenSSL returns X509_V_OK when no certificates are requested. This is |
| 348 | * classed by them as a bug, but it's assumed by at least NGINX. */ |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 349 | hs->new_session->verify_result = X509_V_OK; |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 350 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 351 | /* No certificate, so nothing more to do. */ |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 352 | return 1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 353 | } |
| 354 | |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 355 | hs->new_session->peer_sha256_valid = retain_sha256; |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 356 | return 1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 357 | } |
| 358 | |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 359 | int tls13_process_certificate_verify(SSL_HANDSHAKE *hs) { |
| 360 | SSL *const ssl = hs->ssl; |
Steven Valdez | e7531f0 | 2016-12-14 13:29:57 -0500 | [diff] [blame] | 361 | if (hs->peer_pubkey == NULL) { |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 362 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| 363 | return 0; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 364 | } |
| 365 | |
| 366 | CBS cbs, signature; |
| 367 | uint16_t signature_algorithm; |
| 368 | CBS_init(&cbs, ssl->init_msg, ssl->init_num); |
| 369 | if (!CBS_get_u16(&cbs, &signature_algorithm) || |
| 370 | !CBS_get_u16_length_prefixed(&cbs, &signature) || |
| 371 | CBS_len(&cbs) != 0) { |
| 372 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 373 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 374 | return 0; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 375 | } |
| 376 | |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 377 | uint8_t alert = SSL_AD_DECODE_ERROR; |
| 378 | if (!tls12_check_peer_sigalg(ssl, &alert, signature_algorithm)) { |
| 379 | ssl3_send_alert(ssl, SSL3_AL_FATAL, alert); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 380 | return 0; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 381 | } |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 382 | hs->new_session->peer_signature_algorithm = signature_algorithm; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 383 | |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 384 | uint8_t *msg = NULL; |
| 385 | size_t msg_len; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 386 | if (!tls13_get_cert_verify_signature_input( |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 387 | hs, &msg, &msg_len, |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 388 | ssl->server ? ssl_cert_verify_client : ssl_cert_verify_server)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 389 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 390 | return 0; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 391 | } |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 392 | UniquePtr<uint8_t> free_msg(msg); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 393 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 394 | int sig_ok = ssl_public_key_verify(ssl, CBS_data(&signature), |
| 395 | CBS_len(&signature), signature_algorithm, |
| 396 | hs->peer_pubkey.get(), msg, msg_len); |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 397 | #if defined(BORINGSSL_UNSAFE_FUZZER_MODE) |
| 398 | sig_ok = 1; |
| 399 | ERR_clear_error(); |
| 400 | #endif |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 401 | if (!sig_ok) { |
| 402 | OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_SIGNATURE); |
| 403 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 404 | return 0; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 405 | } |
| 406 | |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 407 | return 1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 408 | } |
| 409 | |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 410 | int tls13_process_finished(SSL_HANDSHAKE *hs, int use_saved_value) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 411 | SSL *const ssl = hs->ssl; |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 412 | uint8_t verify_data_buf[EVP_MAX_MD_SIZE]; |
| 413 | const uint8_t *verify_data; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 414 | size_t verify_data_len; |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 415 | if (use_saved_value) { |
| 416 | assert(ssl->server); |
| 417 | verify_data = hs->expected_client_finished; |
| 418 | verify_data_len = hs->hash_len; |
| 419 | } else { |
| 420 | if (!tls13_finished_mac(hs, verify_data_buf, &verify_data_len, |
| 421 | !ssl->server)) { |
| 422 | return 0; |
| 423 | } |
| 424 | verify_data = verify_data_buf; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 425 | } |
| 426 | |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 427 | int finished_ok = |
| 428 | ssl->init_num == verify_data_len && |
| 429 | CRYPTO_memcmp(verify_data, ssl->init_msg, verify_data_len) == 0; |
| 430 | #if defined(BORINGSSL_UNSAFE_FUZZER_MODE) |
| 431 | finished_ok = 1; |
| 432 | #endif |
| 433 | if (!finished_ok) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 434 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR); |
| 435 | OPENSSL_PUT_ERROR(SSL, SSL_R_DIGEST_CHECK_FAILED); |
| 436 | return 0; |
| 437 | } |
| 438 | |
| 439 | return 1; |
| 440 | } |
| 441 | |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 442 | int tls13_add_certificate(SSL_HANDSHAKE *hs) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 443 | SSL *const ssl = hs->ssl; |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 444 | ScopedCBB cbb; |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 445 | CBB body, certificate_list; |
| 446 | if (!ssl->method->init_message(ssl, cbb.get(), &body, SSL3_MT_CERTIFICATE) || |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 447 | /* The request context is always empty in the handshake. */ |
| 448 | !CBB_add_u8(&body, 0) || |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 449 | !CBB_add_u24_length_prefixed(&body, &certificate_list)) { |
| 450 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 451 | return 0; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 452 | } |
| 453 | |
| 454 | if (!ssl_has_certificate(ssl)) { |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 455 | return ssl_add_message_cbb(ssl, cbb.get()); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 456 | } |
| 457 | |
| 458 | CERT *cert = ssl->cert; |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 459 | CRYPTO_BUFFER *leaf_buf = sk_CRYPTO_BUFFER_value(cert->chain, 0); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 460 | CBB leaf, extensions; |
| 461 | if (!CBB_add_u24_length_prefixed(&certificate_list, &leaf) || |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 462 | !CBB_add_bytes(&leaf, CRYPTO_BUFFER_data(leaf_buf), |
| 463 | CRYPTO_BUFFER_len(leaf_buf)) || |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 464 | !CBB_add_u16_length_prefixed(&certificate_list, &extensions)) { |
| 465 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 466 | return 0; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 467 | } |
| 468 | |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 469 | if (hs->scts_requested && ssl->cert->signed_cert_timestamp_list != NULL) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 470 | CBB contents; |
| 471 | if (!CBB_add_u16(&extensions, TLSEXT_TYPE_certificate_timestamp) || |
| 472 | !CBB_add_u16_length_prefixed(&extensions, &contents) || |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 473 | !CBB_add_bytes( |
| 474 | &contents, |
| 475 | CRYPTO_BUFFER_data(ssl->cert->signed_cert_timestamp_list), |
| 476 | CRYPTO_BUFFER_len(ssl->cert->signed_cert_timestamp_list)) || |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 477 | !CBB_flush(&extensions)) { |
| 478 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 479 | return 0; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 480 | } |
| 481 | } |
| 482 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 483 | if (hs->ocsp_stapling_requested && |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 484 | ssl->cert->ocsp_response != NULL) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 485 | CBB contents, ocsp_response; |
| 486 | if (!CBB_add_u16(&extensions, TLSEXT_TYPE_status_request) || |
| 487 | !CBB_add_u16_length_prefixed(&extensions, &contents) || |
| 488 | !CBB_add_u8(&contents, TLSEXT_STATUSTYPE_ocsp) || |
| 489 | !CBB_add_u24_length_prefixed(&contents, &ocsp_response) || |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 490 | !CBB_add_bytes(&ocsp_response, |
| 491 | CRYPTO_BUFFER_data(ssl->cert->ocsp_response), |
| 492 | CRYPTO_BUFFER_len(ssl->cert->ocsp_response)) || |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 493 | !CBB_flush(&extensions)) { |
| 494 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 495 | return 0; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 496 | } |
| 497 | } |
| 498 | |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 499 | for (size_t i = 1; i < sk_CRYPTO_BUFFER_num(cert->chain); i++) { |
| 500 | CRYPTO_BUFFER *cert_buf = sk_CRYPTO_BUFFER_value(cert->chain, i); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 501 | CBB child; |
| 502 | if (!CBB_add_u24_length_prefixed(&certificate_list, &child) || |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 503 | !CBB_add_bytes(&child, CRYPTO_BUFFER_data(cert_buf), |
| 504 | CRYPTO_BUFFER_len(cert_buf)) || |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 505 | !CBB_add_u16(&certificate_list, 0 /* no extensions */)) { |
| 506 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 507 | return 0; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 508 | } |
| 509 | } |
| 510 | |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 511 | return ssl_add_message_cbb(ssl, cbb.get()); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 512 | } |
| 513 | |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 514 | enum ssl_private_key_result_t tls13_add_certificate_verify(SSL_HANDSHAKE *hs) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 515 | SSL *const ssl = hs->ssl; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 516 | uint16_t signature_algorithm; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 517 | if (!tls1_choose_signature_algorithm(hs, &signature_algorithm)) { |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 518 | return ssl_private_key_failure; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 519 | } |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 520 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 521 | ScopedCBB cbb; |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 522 | CBB body; |
| 523 | if (!ssl->method->init_message(ssl, cbb.get(), &body, |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 524 | SSL3_MT_CERTIFICATE_VERIFY) || |
| 525 | !CBB_add_u16(&body, signature_algorithm)) { |
| 526 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 527 | return ssl_private_key_failure; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 528 | } |
| 529 | |
| 530 | /* Sign the digest. */ |
| 531 | CBB child; |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 532 | const size_t max_sig_len = EVP_PKEY_size(hs->local_pubkey.get()); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 533 | uint8_t *sig; |
| 534 | size_t sig_len; |
| 535 | if (!CBB_add_u16_length_prefixed(&body, &child) || |
| 536 | !CBB_reserve(&child, &sig, max_sig_len)) { |
| 537 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 538 | return ssl_private_key_failure; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 539 | } |
| 540 | |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 541 | uint8_t *msg = NULL; |
| 542 | size_t msg_len; |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 543 | if (!tls13_get_cert_verify_signature_input( |
| 544 | hs, &msg, &msg_len, |
| 545 | ssl->server ? ssl_cert_verify_server : ssl_cert_verify_client)) { |
| 546 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 547 | return ssl_private_key_failure; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 548 | } |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 549 | UniquePtr<uint8_t> free_msg(msg); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 550 | |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 551 | enum ssl_private_key_result_t sign_result = ssl_private_key_sign( |
| 552 | hs, sig, &sig_len, max_sig_len, signature_algorithm, msg, msg_len); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 553 | if (sign_result != ssl_private_key_success) { |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 554 | return sign_result; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 555 | } |
| 556 | |
| 557 | if (!CBB_did_write(&child, sig_len) || |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 558 | !ssl_add_message_cbb(ssl, cbb.get())) { |
| 559 | return ssl_private_key_failure; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 560 | } |
| 561 | |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 562 | return ssl_private_key_success; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 563 | } |
| 564 | |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 565 | int tls13_add_finished(SSL_HANDSHAKE *hs) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 566 | SSL *const ssl = hs->ssl; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 567 | size_t verify_data_len; |
| 568 | uint8_t verify_data[EVP_MAX_MD_SIZE]; |
| 569 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 570 | if (!tls13_finished_mac(hs, verify_data, &verify_data_len, ssl->server)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 571 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 572 | OPENSSL_PUT_ERROR(SSL, SSL_R_DIGEST_CHECK_FAILED); |
| 573 | return 0; |
| 574 | } |
| 575 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 576 | ScopedCBB cbb; |
| 577 | CBB body; |
| 578 | if (!ssl->method->init_message(ssl, cbb.get(), &body, SSL3_MT_FINISHED) || |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 579 | !CBB_add_bytes(&body, verify_data, verify_data_len) || |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 580 | !ssl_add_message_cbb(ssl, cbb.get())) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 581 | return 0; |
| 582 | } |
| 583 | |
| 584 | return 1; |
| 585 | } |
| 586 | |
| 587 | static int tls13_receive_key_update(SSL *ssl) { |
David Benjamin | 95add82 | 2016-10-19 01:09:12 -0400 | [diff] [blame] | 588 | CBS cbs; |
| 589 | uint8_t key_update_request; |
| 590 | CBS_init(&cbs, ssl->init_msg, ssl->init_num); |
| 591 | if (!CBS_get_u8(&cbs, &key_update_request) || |
| 592 | CBS_len(&cbs) != 0 || |
| 593 | (key_update_request != SSL_KEY_UPDATE_NOT_REQUESTED && |
| 594 | key_update_request != SSL_KEY_UPDATE_REQUESTED)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 595 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 596 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 597 | return 0; |
| 598 | } |
| 599 | |
Robert Sloan | 572a4e2 | 2017-04-17 10:52:19 -0700 | [diff] [blame] | 600 | if (!tls13_rotate_traffic_key(ssl, evp_aead_open)) { |
| 601 | return 0; |
| 602 | } |
| 603 | |
| 604 | /* Acknowledge the KeyUpdate */ |
| 605 | if (key_update_request == SSL_KEY_UPDATE_REQUESTED && |
| 606 | !ssl->s3->key_update_pending) { |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 607 | ScopedCBB cbb; |
| 608 | CBB body; |
| 609 | if (!ssl->method->init_message(ssl, cbb.get(), &body, SSL3_MT_KEY_UPDATE) || |
Robert Sloan | 572a4e2 | 2017-04-17 10:52:19 -0700 | [diff] [blame] | 610 | !CBB_add_u8(&body, SSL_KEY_UPDATE_NOT_REQUESTED) || |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 611 | !ssl_add_message_cbb(ssl, cbb.get()) || |
Robert Sloan | 572a4e2 | 2017-04-17 10:52:19 -0700 | [diff] [blame] | 612 | !tls13_rotate_traffic_key(ssl, evp_aead_seal)) { |
Robert Sloan | 572a4e2 | 2017-04-17 10:52:19 -0700 | [diff] [blame] | 613 | return 0; |
| 614 | } |
| 615 | |
| 616 | /* Suppress KeyUpdate acknowledgments until this change is written to the |
| 617 | * wire. This prevents us from accumulating write obligations when read and |
| 618 | * write progress at different rates. See draft-ietf-tls-tls13-18, section |
| 619 | * 4.5.3. */ |
| 620 | ssl->s3->key_update_pending = 1; |
| 621 | } |
| 622 | |
| 623 | return 1; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 624 | } |
| 625 | |
| 626 | int tls13_post_handshake(SSL *ssl) { |
| 627 | if (ssl->s3->tmp.message_type == SSL3_MT_KEY_UPDATE) { |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 628 | ssl->s3->key_update_count++; |
| 629 | if (ssl->s3->key_update_count > kMaxKeyUpdates) { |
| 630 | OPENSSL_PUT_ERROR(SSL, SSL_R_TOO_MANY_KEY_UPDATES); |
| 631 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); |
| 632 | return 0; |
| 633 | } |
| 634 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 635 | return tls13_receive_key_update(ssl); |
| 636 | } |
| 637 | |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 638 | ssl->s3->key_update_count = 0; |
| 639 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 640 | if (ssl->s3->tmp.message_type == SSL3_MT_NEW_SESSION_TICKET && |
| 641 | !ssl->server) { |
| 642 | return tls13_process_new_session_ticket(ssl); |
| 643 | } |
| 644 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 645 | ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); |
| 646 | OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_MESSAGE); |
| 647 | return 0; |
| 648 | } |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 649 | |
| 650 | } // namespace bssl |