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 | 4c22c5f | 2019-03-01 15:53:37 -0800 | [diff] [blame] | 20 | #include <tuple> |
| 21 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 22 | #include <openssl/aead.h> |
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> |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 26 | #include <openssl/hpke.h> |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 27 | #include <openssl/mem.h> |
| 28 | #include <openssl/rand.h> |
| 29 | #include <openssl/stack.h> |
| 30 | |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 31 | #include "../crypto/internal.h" |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 32 | #include "internal.h" |
| 33 | |
| 34 | |
Robert Sloan | 726e9d1 | 2018-09-11 11:45:04 -0700 | [diff] [blame] | 35 | BSSL_NAMESPACE_BEGIN |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 36 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 37 | static const uint8_t kZeroes[EVP_MAX_MD_SIZE] = {0}; |
| 38 | |
Pete Bentley | 0c61efe | 2019-08-13 09:32:23 +0100 | [diff] [blame] | 39 | // Allow a minute of ticket age skew in either direction. This covers |
| 40 | // transmission delays in ClientHello and NewSessionTicket, as well as |
| 41 | // drift between client and server clock rate since the ticket was issued. |
| 42 | // See RFC 8446, section 8.3. |
| 43 | static const int32_t kMaxTicketAgeSkewSeconds = 60; |
| 44 | |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 45 | static bool resolve_ecdhe_secret(SSL_HANDSHAKE *hs, |
| 46 | const SSL_CLIENT_HELLO *client_hello) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 47 | SSL *const ssl = hs->ssl; |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 48 | const uint16_t group_id = hs->new_session->group_id; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 49 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 50 | bool found_key_share; |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 51 | Span<const uint8_t> peer_key; |
David Benjamin | 7c0d06c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 52 | uint8_t alert = SSL_AD_DECODE_ERROR; |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 53 | if (!ssl_ext_key_share_parse_clienthello(hs, &found_key_share, &peer_key, |
| 54 | &alert, client_hello)) { |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 55 | ssl_send_alert(ssl, SSL3_AL_FATAL, alert); |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 56 | return false; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 57 | } |
| 58 | |
| 59 | if (!found_key_share) { |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 60 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); |
| 61 | OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CURVE); |
| 62 | return false; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 63 | } |
| 64 | |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 65 | Array<uint8_t> secret; |
| 66 | SSL_HANDSHAKE_HINTS *const hints = hs->hints.get(); |
| 67 | if (hints && !hs->hints_requested && hints->key_share_group_id == group_id && |
| 68 | !hints->key_share_secret.empty()) { |
| 69 | // Copy DH secret from hints. |
| 70 | if (!hs->ecdh_public_key.CopyFrom(hints->key_share_public_key) || |
| 71 | !secret.CopyFrom(hints->key_share_secret)) { |
| 72 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 73 | return false; |
| 74 | } |
| 75 | } else { |
| 76 | ScopedCBB public_key; |
| 77 | UniquePtr<SSLKeyShare> key_share = SSLKeyShare::Create(group_id); |
| 78 | if (!key_share || // |
| 79 | !CBB_init(public_key.get(), 32) || |
| 80 | !key_share->Accept(public_key.get(), &secret, &alert, peer_key) || |
| 81 | !CBBFinishArray(public_key.get(), &hs->ecdh_public_key)) { |
| 82 | ssl_send_alert(ssl, SSL3_AL_FATAL, alert); |
| 83 | return false; |
| 84 | } |
| 85 | if (hints && hs->hints_requested) { |
| 86 | hints->key_share_group_id = group_id; |
| 87 | if (!hints->key_share_public_key.CopyFrom(hs->ecdh_public_key) || |
| 88 | !hints->key_share_secret.CopyFrom(secret)) { |
| 89 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 90 | return false; |
| 91 | } |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | return tls13_advance_key_schedule(hs, secret); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 96 | } |
| 97 | |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 98 | static int ssl_ext_supported_versions_add_serverhello(SSL_HANDSHAKE *hs, |
| 99 | CBB *out) { |
| 100 | CBB contents; |
| 101 | if (!CBB_add_u16(out, TLSEXT_TYPE_supported_versions) || |
| 102 | !CBB_add_u16_length_prefixed(out, &contents) || |
| 103 | !CBB_add_u16(&contents, hs->ssl->version) || |
| 104 | !CBB_flush(out)) { |
| 105 | return 0; |
| 106 | } |
| 107 | |
| 108 | return 1; |
| 109 | } |
| 110 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 111 | static const SSL_CIPHER *choose_tls13_cipher( |
Robert Sloan | 11c28bd | 2018-12-17 12:09:20 -0800 | [diff] [blame] | 112 | const SSL *ssl, const SSL_CLIENT_HELLO *client_hello, uint16_t group_id) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 113 | CBS cipher_suites; |
| 114 | CBS_init(&cipher_suites, client_hello->cipher_suites, |
| 115 | client_hello->cipher_suites_len); |
| 116 | |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 117 | const uint16_t version = ssl_protocol_version(ssl); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 118 | |
Pete Bentley | 0c61efe | 2019-08-13 09:32:23 +0100 | [diff] [blame] | 119 | return ssl_choose_tls13_cipher(cipher_suites, version, group_id); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 120 | } |
| 121 | |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 122 | static bool add_new_session_tickets(SSL_HANDSHAKE *hs, bool *out_sent_tickets) { |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 123 | SSL *const ssl = hs->ssl; |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 124 | if (// If the client doesn't accept resumption with PSK_DHE_KE, don't send a |
| 125 | // session ticket. |
| 126 | !hs->accept_psk_mode || |
| 127 | // We only implement stateless resumption in TLS 1.3, so skip sending |
| 128 | // tickets if disabled. |
| 129 | (SSL_get_options(ssl) & SSL_OP_NO_TICKET)) { |
| 130 | *out_sent_tickets = false; |
| 131 | return true; |
| 132 | } |
| 133 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 134 | // TLS 1.3 recommends single-use tickets, so issue multiple tickets in case |
| 135 | // the client makes several connections before getting a renewal. |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 136 | static const int kNumTickets = 2; |
| 137 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 138 | // Rebase the session timestamp so that it is measured from ticket |
| 139 | // issuance. |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 140 | ssl_session_rebase_time(ssl, hs->new_session.get()); |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 141 | |
| 142 | for (int i = 0; i < kNumTickets; i++) { |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 143 | UniquePtr<SSL_SESSION> session( |
| 144 | SSL_SESSION_dup(hs->new_session.get(), SSL_SESSION_INCLUDE_NONAUTH)); |
| 145 | if (!session) { |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 146 | return false; |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 147 | } |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 148 | |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 149 | if (!RAND_bytes((uint8_t *)&session->ticket_age_add, 4)) { |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 150 | return false; |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 151 | } |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 152 | session->ticket_age_add_valid = true; |
Pete Bentley | f23caaf | 2020-09-22 18:02:11 +0100 | [diff] [blame] | 153 | bool enable_early_data = |
| 154 | ssl->enable_early_data && |
| 155 | (!ssl->quic_method || !ssl->config->quic_early_data_context.empty()); |
| 156 | if (enable_early_data) { |
Tobias Thierer | 580fcaf | 2019-09-12 20:23:01 +0100 | [diff] [blame] | 157 | // QUIC does not use the max_early_data_size parameter and always sets it |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 158 | // to a fixed value. See RFC 9001, section 4.6.1. |
Tobias Thierer | 580fcaf | 2019-09-12 20:23:01 +0100 | [diff] [blame] | 159 | session->ticket_max_early_data = |
| 160 | ssl->quic_method != nullptr ? 0xffffffff : kMaxEarlyDataAccepted; |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 161 | } |
| 162 | |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 163 | static_assert(kNumTickets < 256, "Too many tickets"); |
| 164 | uint8_t nonce[] = {static_cast<uint8_t>(i)}; |
| 165 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 166 | ScopedCBB cbb; |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 167 | CBB body, nonce_cbb, ticket, extensions; |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 168 | if (!ssl->method->init_message(ssl, cbb.get(), &body, |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 169 | SSL3_MT_NEW_SESSION_TICKET) || |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 170 | !CBB_add_u32(&body, session->timeout) || |
| 171 | !CBB_add_u32(&body, session->ticket_age_add) || |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 172 | !CBB_add_u8_length_prefixed(&body, &nonce_cbb) || |
| 173 | !CBB_add_bytes(&nonce_cbb, nonce, sizeof(nonce)) || |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 174 | !CBB_add_u16_length_prefixed(&body, &ticket) || |
Robert Sloan | 4c22c5f | 2019-03-01 15:53:37 -0800 | [diff] [blame] | 175 | !tls13_derive_session_psk(session.get(), nonce) || |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 176 | !ssl_encrypt_ticket(hs, &ticket, session.get()) || |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 177 | !CBB_add_u16_length_prefixed(&body, &extensions)) { |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 178 | return false; |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 179 | } |
| 180 | |
Pete Bentley | f23caaf | 2020-09-22 18:02:11 +0100 | [diff] [blame] | 181 | if (enable_early_data) { |
Tobias Thierer | 6204b54 | 2019-10-18 21:55:05 +0100 | [diff] [blame] | 182 | CBB early_data; |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 183 | if (!CBB_add_u16(&extensions, TLSEXT_TYPE_early_data) || |
Tobias Thierer | 6204b54 | 2019-10-18 21:55:05 +0100 | [diff] [blame] | 184 | !CBB_add_u16_length_prefixed(&extensions, &early_data) || |
| 185 | !CBB_add_u32(&early_data, session->ticket_max_early_data) || |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 186 | !CBB_flush(&extensions)) { |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 187 | return false; |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 188 | } |
| 189 | } |
| 190 | |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 191 | // Add a fake extension. See RFC 8701. |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 192 | if (!CBB_add_u16(&extensions, |
Robert Sloan | 309a31e | 2018-01-29 10:22:47 -0800 | [diff] [blame] | 193 | ssl_get_grease_value(hs, ssl_grease_ticket_extension)) || |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 194 | !CBB_add_u16(&extensions, 0 /* empty */)) { |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 195 | return false; |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 196 | } |
| 197 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 198 | if (!ssl_add_message_cbb(ssl, cbb.get())) { |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 199 | return false; |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 200 | } |
| 201 | } |
| 202 | |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 203 | *out_sent_tickets = true; |
| 204 | return true; |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 205 | } |
| 206 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 207 | static enum ssl_hs_wait_t do_select_parameters(SSL_HANDSHAKE *hs) { |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 208 | // At this point, most ClientHello extensions have already been processed by |
| 209 | // the common handshake logic. Resolve the remaining non-PSK parameters. |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 210 | SSL *const ssl = hs->ssl; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 211 | SSLMessage msg; |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 212 | SSL_CLIENT_HELLO client_hello; |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 213 | if (!hs->GetClientHello(&msg, &client_hello)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 214 | return ssl_hs_error; |
| 215 | } |
| 216 | |
Pete Bentley | f23caaf | 2020-09-22 18:02:11 +0100 | [diff] [blame] | 217 | if (ssl->quic_method != nullptr && client_hello.session_id_len > 0) { |
| 218 | OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_COMPATIBILITY_MODE); |
| 219 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); |
| 220 | return ssl_hs_error; |
| 221 | } |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 222 | OPENSSL_memcpy(hs->session_id, client_hello.session_id, |
| 223 | client_hello.session_id_len); |
| 224 | hs->session_id_len = client_hello.session_id_len; |
| 225 | |
Robert Sloan | 11c28bd | 2018-12-17 12:09:20 -0800 | [diff] [blame] | 226 | uint16_t group_id; |
| 227 | if (!tls1_get_shared_group(hs, &group_id)) { |
| 228 | OPENSSL_PUT_ERROR(SSL, SSL_R_NO_SHARED_GROUP); |
| 229 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); |
| 230 | return ssl_hs_error; |
| 231 | } |
| 232 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 233 | // Negotiate the cipher suite. |
Robert Sloan | 11c28bd | 2018-12-17 12:09:20 -0800 | [diff] [blame] | 234 | hs->new_cipher = choose_tls13_cipher(ssl, &client_hello, group_id); |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 235 | if (hs->new_cipher == NULL) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 236 | OPENSSL_PUT_ERROR(SSL, SSL_R_NO_SHARED_CIPHER); |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 237 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 238 | return ssl_hs_error; |
| 239 | } |
| 240 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 241 | // HTTP/2 negotiation depends on the cipher suite, so ALPN negotiation was |
| 242 | // deferred. Complete it now. |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 243 | uint8_t alert = SSL_AD_DECODE_ERROR; |
| 244 | if (!ssl_negotiate_alpn(hs, &alert, &client_hello)) { |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 245 | ssl_send_alert(ssl, SSL3_AL_FATAL, alert); |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 246 | return ssl_hs_error; |
| 247 | } |
| 248 | |
Pete Bentley | 2f26c21 | 2021-10-01 11:32:03 +0000 | [diff] [blame] | 249 | // The PRF hash is now known. |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 250 | if (!hs->transcript.InitHash(ssl_protocol_version(ssl), hs->new_cipher)) { |
| 251 | return ssl_hs_error; |
| 252 | } |
| 253 | |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 254 | hs->tls13_state = state13_select_session; |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 255 | return ssl_hs_ok; |
| 256 | } |
Robert Sloan | 5d62578 | 2017-02-13 09:55:39 -0800 | [diff] [blame] | 257 | |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 258 | static enum ssl_ticket_aead_result_t select_session( |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 259 | SSL_HANDSHAKE *hs, uint8_t *out_alert, UniquePtr<SSL_SESSION> *out_session, |
Pete Bentley | 0c61efe | 2019-08-13 09:32:23 +0100 | [diff] [blame] | 260 | int32_t *out_ticket_age_skew, bool *out_offered_ticket, |
| 261 | const SSLMessage &msg, const SSL_CLIENT_HELLO *client_hello) { |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 262 | SSL *const ssl = hs->ssl; |
Pete Bentley | 0c61efe | 2019-08-13 09:32:23 +0100 | [diff] [blame] | 263 | *out_session = nullptr; |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 264 | |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 265 | CBS pre_shared_key; |
Pete Bentley | 0c61efe | 2019-08-13 09:32:23 +0100 | [diff] [blame] | 266 | *out_offered_ticket = ssl_client_hello_get_extension( |
| 267 | client_hello, &pre_shared_key, TLSEXT_TYPE_pre_shared_key); |
| 268 | if (!*out_offered_ticket) { |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 269 | return ssl_ticket_aead_ignore_ticket; |
| 270 | } |
| 271 | |
Pete Bentley | 2f26c21 | 2021-10-01 11:32:03 +0000 | [diff] [blame] | 272 | // Per RFC 8446, section 4.2.9, servers MUST abort the handshake if the client |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 273 | // sends pre_shared_key without psk_key_exchange_modes. |
| 274 | CBS unused; |
| 275 | if (!ssl_client_hello_get_extension(client_hello, &unused, |
| 276 | TLSEXT_TYPE_psk_key_exchange_modes)) { |
| 277 | *out_alert = SSL_AD_MISSING_EXTENSION; |
| 278 | OPENSSL_PUT_ERROR(SSL, SSL_R_MISSING_EXTENSION); |
| 279 | return ssl_ticket_aead_error; |
| 280 | } |
| 281 | |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 282 | CBS ticket, binders; |
| 283 | uint32_t client_ticket_age; |
Tobias Thierer | 5b7aef4 | 2019-08-23 11:08:22 +0100 | [diff] [blame] | 284 | if (!ssl_ext_pre_shared_key_parse_clienthello( |
| 285 | hs, &ticket, &binders, &client_ticket_age, out_alert, client_hello, |
| 286 | &pre_shared_key)) { |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 287 | return ssl_ticket_aead_error; |
| 288 | } |
| 289 | |
Pete Bentley | 0c61efe | 2019-08-13 09:32:23 +0100 | [diff] [blame] | 290 | // If the peer did not offer psk_dhe, ignore the resumption. |
| 291 | if (!hs->accept_psk_mode) { |
| 292 | return ssl_ticket_aead_ignore_ticket; |
| 293 | } |
| 294 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 295 | // TLS 1.3 session tickets are renewed separately as part of the |
| 296 | // NewSessionTicket. |
| 297 | bool unused_renew; |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 298 | UniquePtr<SSL_SESSION> session; |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 299 | enum ssl_ticket_aead_result_t ret = |
Robert Sloan | d9e572d | 2018-08-27 12:27:00 -0700 | [diff] [blame] | 300 | ssl_process_ticket(hs, &session, &unused_renew, ticket, {}); |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 301 | switch (ret) { |
| 302 | case ssl_ticket_aead_success: |
| 303 | break; |
| 304 | case ssl_ticket_aead_error: |
| 305 | *out_alert = SSL_AD_INTERNAL_ERROR; |
| 306 | return ret; |
| 307 | default: |
| 308 | return ret; |
| 309 | } |
| 310 | |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 311 | if (!ssl_session_is_resumable(hs, session.get()) || |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 312 | // Historically, some TLS 1.3 tickets were missing ticket_age_add. |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 313 | !session->ticket_age_add_valid) { |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 314 | return ssl_ticket_aead_ignore_ticket; |
| 315 | } |
| 316 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 317 | // Recover the client ticket age and convert to seconds. |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 318 | client_ticket_age -= session->ticket_age_add; |
| 319 | client_ticket_age /= 1000; |
| 320 | |
| 321 | struct OPENSSL_timeval now; |
| 322 | ssl_get_current_time(ssl, &now); |
| 323 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 324 | // Compute the server ticket age in seconds. |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 325 | assert(now.tv_sec >= session->time); |
| 326 | uint64_t server_ticket_age = now.tv_sec - session->time; |
| 327 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 328 | // To avoid overflowing |hs->ticket_age_skew|, we will not resume |
| 329 | // 68-year-old sessions. |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 330 | if (server_ticket_age > INT32_MAX) { |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 331 | return ssl_ticket_aead_ignore_ticket; |
| 332 | } |
| 333 | |
Pete Bentley | 4763734 | 2019-08-19 12:22:49 +0100 | [diff] [blame] | 334 | *out_ticket_age_skew = static_cast<int32_t>(client_ticket_age) - |
| 335 | static_cast<int32_t>(server_ticket_age); |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 336 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 337 | // Check the PSK binder. |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 338 | if (!tls13_verify_psk_binder(hs, session.get(), msg, &binders)) { |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 339 | *out_alert = SSL_AD_DECRYPT_ERROR; |
| 340 | return ssl_ticket_aead_error; |
| 341 | } |
| 342 | |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 343 | *out_session = std::move(session); |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 344 | return ssl_ticket_aead_success; |
| 345 | } |
| 346 | |
Pete Bentley | f23caaf | 2020-09-22 18:02:11 +0100 | [diff] [blame] | 347 | static bool quic_ticket_compatible(const SSL_SESSION *session, |
| 348 | const SSL_CONFIG *config) { |
| 349 | if (!session->is_quic) { |
| 350 | return true; |
| 351 | } |
| 352 | |
| 353 | if (session->quic_early_data_context.empty() || |
| 354 | config->quic_early_data_context.size() != |
| 355 | session->quic_early_data_context.size() || |
| 356 | CRYPTO_memcmp(config->quic_early_data_context.data(), |
| 357 | session->quic_early_data_context.data(), |
| 358 | session->quic_early_data_context.size()) != 0) { |
| 359 | return false; |
| 360 | } |
| 361 | return true; |
| 362 | } |
| 363 | |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 364 | static enum ssl_hs_wait_t do_select_session(SSL_HANDSHAKE *hs) { |
| 365 | SSL *const ssl = hs->ssl; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 366 | SSLMessage msg; |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 367 | SSL_CLIENT_HELLO client_hello; |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 368 | if (!hs->GetClientHello(&msg, &client_hello)) { |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 369 | return ssl_hs_error; |
| 370 | } |
| 371 | |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 372 | uint8_t alert = SSL_AD_DECODE_ERROR; |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 373 | UniquePtr<SSL_SESSION> session; |
Pete Bentley | 0c61efe | 2019-08-13 09:32:23 +0100 | [diff] [blame] | 374 | bool offered_ticket = false; |
| 375 | switch (select_session(hs, &alert, &session, &ssl->s3->ticket_age_skew, |
| 376 | &offered_ticket, msg, &client_hello)) { |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 377 | case ssl_ticket_aead_ignore_ticket: |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 378 | assert(!session); |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 379 | if (!ssl_get_new_session(hs)) { |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 380 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 381 | return ssl_hs_error; |
| 382 | } |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 383 | break; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 384 | |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 385 | case ssl_ticket_aead_success: |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 386 | // Carry over authentication information from the previous handshake into |
| 387 | // a fresh session. |
Robert Sloan | fe7cd21 | 2017-08-07 09:03:39 -0700 | [diff] [blame] | 388 | hs->new_session = |
| 389 | SSL_SESSION_dup(session.get(), SSL_SESSION_DUP_AUTH_ONLY); |
Pete Bentley | 0c61efe | 2019-08-13 09:32:23 +0100 | [diff] [blame] | 390 | if (hs->new_session == nullptr) { |
Srinivas Paladugu | dd42a61 | 2019-08-09 19:30:39 +0000 | [diff] [blame] | 391 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 392 | return ssl_hs_error; |
Pete Bentley | a5c947b | 2019-08-09 14:24:27 +0000 | [diff] [blame] | 393 | } |
| 394 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 395 | ssl->s3->session_reused = true; |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 396 | hs->can_release_private_key = true; |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 397 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 398 | // Resumption incorporates fresh key material, so refresh the timeout. |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 399 | ssl_session_renew_timeout(ssl, hs->new_session.get(), |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 400 | ssl->session_ctx->session_psk_dhe_timeout); |
| 401 | break; |
| 402 | |
| 403 | case ssl_ticket_aead_error: |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 404 | ssl_send_alert(ssl, SSL3_AL_FATAL, alert); |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 405 | return ssl_hs_error; |
| 406 | |
| 407 | case ssl_ticket_aead_retry: |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 408 | hs->tls13_state = state13_select_session; |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 409 | return ssl_hs_pending_ticket; |
| 410 | } |
| 411 | |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 412 | // Negotiate ALPS now, after ALPN is negotiated and |hs->new_session| is |
| 413 | // initialized. |
| 414 | if (!ssl_negotiate_alps(hs, &alert, &client_hello)) { |
| 415 | ssl_send_alert(ssl, SSL3_AL_FATAL, alert); |
| 416 | return ssl_hs_error; |
| 417 | } |
| 418 | |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 419 | // Record connection properties in the new session. |
| 420 | hs->new_session->cipher = hs->new_cipher; |
| 421 | if (!tls1_get_shared_group(hs, &hs->new_session->group_id)) { |
| 422 | OPENSSL_PUT_ERROR(SSL, SSL_R_NO_SHARED_GROUP); |
| 423 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); |
| 424 | return ssl_hs_error; |
| 425 | } |
| 426 | |
| 427 | // Determine if we need HelloRetryRequest. |
| 428 | bool found_key_share; |
| 429 | if (!ssl_ext_key_share_parse_clienthello(hs, &found_key_share, |
| 430 | /*out_key_share=*/nullptr, &alert, |
| 431 | &client_hello)) { |
| 432 | ssl_send_alert(ssl, SSL3_AL_FATAL, alert); |
| 433 | return ssl_hs_error; |
| 434 | } |
| 435 | |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 436 | // Determine if we're negotiating 0-RTT. |
| 437 | if (!ssl->enable_early_data) { |
| 438 | ssl->s3->early_data_reason = ssl_early_data_disabled; |
| 439 | } else if (!offered_ticket) { |
| 440 | ssl->s3->early_data_reason = ssl_early_data_no_session_offered; |
| 441 | } else if (!session) { |
| 442 | ssl->s3->early_data_reason = ssl_early_data_session_not_resumed; |
| 443 | } else if (session->ticket_max_early_data == 0) { |
| 444 | ssl->s3->early_data_reason = ssl_early_data_unsupported_for_session; |
| 445 | } else if (!hs->early_data_offered) { |
| 446 | ssl->s3->early_data_reason = ssl_early_data_peer_declined; |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 447 | } else if (hs->channel_id_negotiated) { |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 448 | // Channel ID is incompatible with 0-RTT. |
| 449 | ssl->s3->early_data_reason = ssl_early_data_channel_id; |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 450 | } else if (MakeConstSpan(ssl->s3->alpn_selected) != session->early_alpn) { |
| 451 | // The negotiated ALPN must match the one in the ticket. |
| 452 | ssl->s3->early_data_reason = ssl_early_data_alpn_mismatch; |
| 453 | } else if (hs->new_session->has_application_settings != |
| 454 | session->has_application_settings || |
| 455 | MakeConstSpan(hs->new_session->local_application_settings) != |
| 456 | session->local_application_settings) { |
| 457 | ssl->s3->early_data_reason = ssl_early_data_alps_mismatch; |
| 458 | } else if (ssl->s3->ticket_age_skew < -kMaxTicketAgeSkewSeconds || |
| 459 | kMaxTicketAgeSkewSeconds < ssl->s3->ticket_age_skew) { |
| 460 | ssl->s3->early_data_reason = ssl_early_data_ticket_age_skew; |
| 461 | } else if (!quic_ticket_compatible(session.get(), hs->config)) { |
| 462 | ssl->s3->early_data_reason = ssl_early_data_quic_parameter_mismatch; |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 463 | } else if (!found_key_share) { |
| 464 | ssl->s3->early_data_reason = ssl_early_data_hello_retry_request; |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 465 | } else { |
| 466 | // |ssl_session_is_resumable| forbids cross-cipher resumptions even if the |
| 467 | // PRF hashes match. |
| 468 | assert(hs->new_cipher == session->cipher); |
| 469 | |
| 470 | ssl->s3->early_data_reason = ssl_early_data_accepted; |
| 471 | ssl->s3->early_data_accepted = true; |
| 472 | } |
| 473 | |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 474 | // Store the ALPN and ALPS values in the session for 0-RTT. Note the peer |
| 475 | // applications settings are not generally known until client |
| 476 | // EncryptedExtensions. |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 477 | if (!hs->new_session->early_alpn.CopyFrom(ssl->s3->alpn_selected)) { |
| 478 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 479 | return ssl_hs_error; |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 480 | } |
| 481 | |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 482 | // The peer applications settings are usually received later, in |
| 483 | // EncryptedExtensions. But, in 0-RTT handshakes, we carry over the |
| 484 | // values from |session|. Do this now, before |session| is discarded. |
| 485 | if (ssl->s3->early_data_accepted && |
| 486 | hs->new_session->has_application_settings && |
| 487 | !hs->new_session->peer_application_settings.CopyFrom( |
| 488 | session->peer_application_settings)) { |
| 489 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 490 | return ssl_hs_error; |
| 491 | } |
| 492 | |
Pete Bentley | b2db956 | 2020-10-13 12:57:59 +0100 | [diff] [blame] | 493 | // Copy the QUIC early data context to the session. |
| 494 | if (ssl->enable_early_data && ssl->quic_method) { |
| 495 | if (!hs->new_session->quic_early_data_context.CopyFrom( |
| 496 | hs->config->quic_early_data_context)) { |
| 497 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 498 | return ssl_hs_error; |
| 499 | } |
| 500 | } |
| 501 | |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 502 | if (ssl->ctx->dos_protection_cb != NULL && |
| 503 | ssl->ctx->dos_protection_cb(&client_hello) == 0) { |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 504 | // Connection rejected for DOS reasons. |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 505 | OPENSSL_PUT_ERROR(SSL, SSL_R_CONNECTION_REJECTED); |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 506 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 507 | return ssl_hs_error; |
| 508 | } |
| 509 | |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 510 | size_t hash_len = EVP_MD_size( |
| 511 | ssl_get_handshake_digest(ssl_protocol_version(ssl), hs->new_cipher)); |
| 512 | |
| 513 | // Set up the key schedule and incorporate the PSK into the running secret. |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 514 | if (!tls13_init_key_schedule( |
| 515 | hs, ssl->s3->session_reused |
| 516 | ? MakeConstSpan(hs->new_session->secret, |
| 517 | hs->new_session->secret_length) |
| 518 | : MakeConstSpan(kZeroes, hash_len)) || |
| 519 | !ssl_hash_message(hs, msg)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 520 | return ssl_hs_error; |
| 521 | } |
| 522 | |
Robert Sloan | 0da4395 | 2018-01-03 15:13:14 -0800 | [diff] [blame] | 523 | if (ssl->s3->early_data_accepted) { |
Tobias Thierer | 580fcaf | 2019-09-12 20:23:01 +0100 | [diff] [blame] | 524 | if (!tls13_derive_early_secret(hs)) { |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 525 | return ssl_hs_error; |
| 526 | } |
| 527 | } else if (hs->early_data_offered) { |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 528 | ssl->s3->skip_early_data = true; |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 529 | } |
| 530 | |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 531 | if (!found_key_share) { |
| 532 | ssl->method->next_message(ssl); |
| 533 | if (!hs->transcript.UpdateForHelloRetryRequest()) { |
| 534 | return ssl_hs_error; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 535 | } |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 536 | hs->tls13_state = state13_send_hello_retry_request; |
| 537 | return ssl_hs_ok; |
| 538 | } |
| 539 | |
| 540 | if (!resolve_ecdhe_secret(hs, &client_hello)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 541 | return ssl_hs_error; |
| 542 | } |
| 543 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 544 | ssl->method->next_message(ssl); |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 545 | hs->ech_client_hello_buf.Reset(); |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 546 | hs->tls13_state = state13_send_server_hello; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 547 | return ssl_hs_ok; |
| 548 | } |
| 549 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 550 | static enum ssl_hs_wait_t do_send_hello_retry_request(SSL_HANDSHAKE *hs) { |
| 551 | SSL *const ssl = hs->ssl; |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 552 | if (hs->hints_requested) { |
| 553 | return ssl_hs_hints_ready; |
| 554 | } |
Robert Sloan | d5c2215 | 2017-11-13 09:22:12 -0800 | [diff] [blame] | 555 | |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 556 | ScopedCBB cbb; |
| 557 | CBB body, session_id, extensions; |
| 558 | uint16_t group_id; |
| 559 | if (!ssl->method->init_message(ssl, cbb.get(), &body, SSL3_MT_SERVER_HELLO) || |
| 560 | !CBB_add_u16(&body, TLS1_2_VERSION) || |
| 561 | !CBB_add_bytes(&body, kHelloRetryRequest, SSL3_RANDOM_SIZE) || |
| 562 | !CBB_add_u8_length_prefixed(&body, &session_id) || |
| 563 | !CBB_add_bytes(&session_id, hs->session_id, hs->session_id_len) || |
Pete Bentley | f23caaf | 2020-09-22 18:02:11 +0100 | [diff] [blame] | 564 | !CBB_add_u16(&body, SSL_CIPHER_get_protocol_id(hs->new_cipher)) || |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 565 | !CBB_add_u8(&body, 0 /* no compression */) || |
| 566 | !tls1_get_shared_group(hs, &group_id) || |
| 567 | !CBB_add_u16_length_prefixed(&body, &extensions) || |
| 568 | !CBB_add_u16(&extensions, TLSEXT_TYPE_supported_versions) || |
| 569 | !CBB_add_u16(&extensions, 2 /* length */) || |
| 570 | !CBB_add_u16(&extensions, ssl->version) || |
| 571 | !CBB_add_u16(&extensions, TLSEXT_TYPE_key_share) || |
| 572 | !CBB_add_u16(&extensions, 2 /* length */) || |
Pete Bentley | 2f26c21 | 2021-10-01 11:32:03 +0000 | [diff] [blame] | 573 | !CBB_add_u16(&extensions, group_id)) { |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 574 | return ssl_hs_error; |
| 575 | } |
Pete Bentley | 2f26c21 | 2021-10-01 11:32:03 +0000 | [diff] [blame] | 576 | if (hs->ech_is_inner) { |
| 577 | // Fill a placeholder for the ECH confirmation value. |
| 578 | if (!CBB_add_u16(&extensions, TLSEXT_TYPE_encrypted_client_hello) || |
| 579 | !CBB_add_u16(&extensions, ECH_CONFIRMATION_SIGNAL_LEN) || |
| 580 | !CBB_add_zeros(&extensions, ECH_CONFIRMATION_SIGNAL_LEN)) { |
| 581 | return ssl_hs_error; |
| 582 | } |
| 583 | } |
| 584 | Array<uint8_t> hrr; |
| 585 | if (!ssl->method->finish_message(ssl, cbb.get(), &hrr)) { |
| 586 | return ssl_hs_error; |
| 587 | } |
| 588 | if (hs->ech_is_inner) { |
| 589 | // Now that the message is encoded, fill in the whole value. |
| 590 | size_t offset = hrr.size() - ECH_CONFIRMATION_SIGNAL_LEN; |
| 591 | if (!ssl_ech_accept_confirmation( |
| 592 | hs, MakeSpan(hrr).last(ECH_CONFIRMATION_SIGNAL_LEN), |
| 593 | ssl->s3->client_random, hs->transcript, /*is_hrr=*/true, hrr, |
| 594 | offset)) { |
| 595 | return ssl_hs_error; |
| 596 | } |
| 597 | } |
Robert Sloan | d5c2215 | 2017-11-13 09:22:12 -0800 | [diff] [blame] | 598 | |
Pete Bentley | 2f26c21 | 2021-10-01 11:32:03 +0000 | [diff] [blame] | 599 | if (!ssl->method->add_message(ssl, std::move(hrr)) || |
| 600 | !ssl->method->add_change_cipher_spec(ssl)) { |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 601 | return ssl_hs_error; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 602 | } |
| 603 | |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 604 | ssl->s3->used_hello_retry_request = true; |
| 605 | hs->tls13_state = state13_read_second_client_hello; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 606 | return ssl_hs_flush; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 607 | } |
| 608 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 609 | static enum ssl_hs_wait_t do_read_second_client_hello(SSL_HANDSHAKE *hs) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 610 | SSL *const ssl = hs->ssl; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 611 | SSLMessage msg; |
| 612 | if (!ssl->method->get_message(ssl, &msg)) { |
| 613 | return ssl_hs_read_message; |
| 614 | } |
| 615 | if (!ssl_check_message_type(ssl, msg, SSL3_MT_CLIENT_HELLO)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 616 | return ssl_hs_error; |
| 617 | } |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 618 | SSL_CLIENT_HELLO client_hello; |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 619 | if (!ssl_client_hello_init(ssl, &client_hello, msg.body)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 620 | OPENSSL_PUT_ERROR(SSL, SSL_R_CLIENTHELLO_PARSE_FAILED); |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 621 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 622 | return ssl_hs_error; |
| 623 | } |
| 624 | |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 625 | if (ssl->s3->ech_status == ssl_ech_accepted) { |
Pete Bentley | 2f26c21 | 2021-10-01 11:32:03 +0000 | [diff] [blame] | 626 | // If we previously accepted the ClientHelloInner, the second ClientHello |
| 627 | // must contain an outer encrypted_client_hello extension. |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 628 | CBS ech_body; |
| 629 | if (!ssl_client_hello_get_extension(&client_hello, &ech_body, |
| 630 | TLSEXT_TYPE_encrypted_client_hello)) { |
| 631 | OPENSSL_PUT_ERROR(SSL, SSL_R_MISSING_EXTENSION); |
| 632 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_MISSING_EXTENSION); |
| 633 | return ssl_hs_error; |
| 634 | } |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 635 | uint16_t kdf_id, aead_id; |
Pete Bentley | 2f26c21 | 2021-10-01 11:32:03 +0000 | [diff] [blame] | 636 | uint8_t type, config_id; |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 637 | CBS enc, payload; |
Pete Bentley | 2f26c21 | 2021-10-01 11:32:03 +0000 | [diff] [blame] | 638 | if (!CBS_get_u8(&ech_body, &type) || // |
| 639 | type != ECH_CLIENT_OUTER || // |
| 640 | !CBS_get_u16(&ech_body, &kdf_id) || // |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 641 | !CBS_get_u16(&ech_body, &aead_id) || |
| 642 | !CBS_get_u8(&ech_body, &config_id) || |
| 643 | !CBS_get_u16_length_prefixed(&ech_body, &enc) || |
| 644 | !CBS_get_u16_length_prefixed(&ech_body, &payload) || |
| 645 | CBS_len(&ech_body) != 0) { |
| 646 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 647 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 648 | return ssl_hs_error; |
| 649 | } |
| 650 | |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 651 | if (kdf_id != EVP_HPKE_KDF_id(EVP_HPKE_CTX_kdf(hs->ech_hpke_ctx.get())) || |
| 652 | aead_id != |
| 653 | EVP_HPKE_AEAD_id(EVP_HPKE_CTX_aead(hs->ech_hpke_ctx.get())) || |
| 654 | config_id != hs->ech_config_id || CBS_len(&enc) > 0) { |
| 655 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 656 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); |
| 657 | return ssl_hs_error; |
| 658 | } |
| 659 | |
| 660 | // Decrypt the payload with the HPKE context from the first ClientHello. |
| 661 | Array<uint8_t> encoded_client_hello_inner; |
| 662 | bool unused; |
Pete Bentley | 2f26c21 | 2021-10-01 11:32:03 +0000 | [diff] [blame] | 663 | if (!ssl_client_hello_decrypt(hs->ech_hpke_ctx.get(), |
| 664 | &encoded_client_hello_inner, &unused, |
| 665 | &client_hello, payload)) { |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 666 | // Decryption failure is fatal in the second ClientHello. |
| 667 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECRYPTION_FAILED); |
| 668 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR); |
| 669 | return ssl_hs_error; |
| 670 | } |
| 671 | |
| 672 | // Recover the ClientHelloInner from the EncodedClientHelloInner. |
| 673 | uint8_t alert = SSL_AD_DECODE_ERROR; |
| 674 | bssl::Array<uint8_t> client_hello_inner; |
| 675 | if (!ssl_decode_client_hello_inner(ssl, &alert, &client_hello_inner, |
| 676 | encoded_client_hello_inner, |
| 677 | &client_hello)) { |
| 678 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 679 | ssl_send_alert(ssl, SSL3_AL_FATAL, alert); |
| 680 | return ssl_hs_error; |
| 681 | } |
| 682 | hs->ech_client_hello_buf = std::move(client_hello_inner); |
| 683 | |
| 684 | // Reparse |client_hello| from the buffer owned by |hs|. |
| 685 | if (!hs->GetClientHello(&msg, &client_hello)) { |
| 686 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| 687 | return ssl_hs_error; |
| 688 | } |
| 689 | } |
| 690 | |
Tobias Thierer | 5b7aef4 | 2019-08-23 11:08:22 +0100 | [diff] [blame] | 691 | // We perform all our negotiation based on the first ClientHello (for |
| 692 | // consistency with what |select_certificate_cb| observed), which is in the |
| 693 | // transcript, so we can ignore most of this second one. |
| 694 | // |
| 695 | // We do, however, check the second PSK binder. This covers the client key |
| 696 | // share, in case we ever send half-RTT data (we currently do not). It is also |
| 697 | // a tricky computation, so we enforce the peer handled it correctly. |
| 698 | if (ssl->s3->session_reused) { |
| 699 | CBS pre_shared_key; |
| 700 | if (!ssl_client_hello_get_extension(&client_hello, &pre_shared_key, |
| 701 | TLSEXT_TYPE_pre_shared_key)) { |
| 702 | OPENSSL_PUT_ERROR(SSL, SSL_R_INCONSISTENT_CLIENT_HELLO); |
| 703 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); |
| 704 | return ssl_hs_error; |
| 705 | } |
| 706 | |
| 707 | CBS ticket, binders; |
| 708 | uint32_t client_ticket_age; |
| 709 | uint8_t alert = SSL_AD_DECODE_ERROR; |
| 710 | if (!ssl_ext_pre_shared_key_parse_clienthello( |
| 711 | hs, &ticket, &binders, &client_ticket_age, &alert, &client_hello, |
| 712 | &pre_shared_key)) { |
| 713 | ssl_send_alert(ssl, SSL3_AL_FATAL, alert); |
| 714 | return ssl_hs_error; |
| 715 | } |
| 716 | |
| 717 | // Note it is important that we do not obtain a new |SSL_SESSION| from |
| 718 | // |ticket|. We have already selected parameters based on the first |
| 719 | // ClientHello (in the transcript) and must not switch partway through. |
| 720 | if (!tls13_verify_psk_binder(hs, hs->new_session.get(), msg, &binders)) { |
| 721 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR); |
| 722 | return ssl_hs_error; |
| 723 | } |
| 724 | } |
| 725 | |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 726 | if (!resolve_ecdhe_secret(hs, &client_hello)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 727 | return ssl_hs_error; |
| 728 | } |
| 729 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 730 | if (!ssl_hash_message(hs, msg)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 731 | return ssl_hs_error; |
| 732 | } |
| 733 | |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 734 | // ClientHello should be the end of the flight. |
| 735 | if (ssl->method->has_unprocessed_handshake_data(ssl)) { |
| 736 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); |
| 737 | OPENSSL_PUT_ERROR(SSL, SSL_R_EXCESS_HANDSHAKE_DATA); |
| 738 | return ssl_hs_error; |
| 739 | } |
| 740 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 741 | ssl->method->next_message(ssl); |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 742 | hs->ech_client_hello_buf.Reset(); |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 743 | hs->tls13_state = state13_send_server_hello; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 744 | return ssl_hs_ok; |
| 745 | } |
| 746 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 747 | static enum ssl_hs_wait_t do_send_server_hello(SSL_HANDSHAKE *hs) { |
| 748 | SSL *const ssl = hs->ssl; |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 749 | |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 750 | Span<uint8_t> random(ssl->s3->server_random); |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 751 | |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 752 | SSL_HANDSHAKE_HINTS *const hints = hs->hints.get(); |
| 753 | if (hints && !hs->hints_requested && |
| 754 | hints->server_random.size() == random.size()) { |
| 755 | OPENSSL_memcpy(random.data(), hints->server_random.data(), random.size()); |
| 756 | } else { |
| 757 | RAND_bytes(random.data(), random.size()); |
| 758 | if (hints && hs->hints_requested && |
| 759 | !hints->server_random.CopyFrom(random)) { |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 760 | return ssl_hs_error; |
| 761 | } |
| 762 | } |
| 763 | |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 764 | Array<uint8_t> server_hello; |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 765 | ScopedCBB cbb; |
| 766 | CBB body, extensions, session_id; |
| 767 | if (!ssl->method->init_message(ssl, cbb.get(), &body, SSL3_MT_SERVER_HELLO) || |
Robert Sloan | 0da4395 | 2018-01-03 15:13:14 -0800 | [diff] [blame] | 768 | !CBB_add_u16(&body, TLS1_2_VERSION) || |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 769 | !CBB_add_bytes(&body, ssl->s3->server_random, |
| 770 | sizeof(ssl->s3->server_random)) || |
Robert Sloan | 0da4395 | 2018-01-03 15:13:14 -0800 | [diff] [blame] | 771 | !CBB_add_u8_length_prefixed(&body, &session_id) || |
| 772 | !CBB_add_bytes(&session_id, hs->session_id, hs->session_id_len) || |
Pete Bentley | f23caaf | 2020-09-22 18:02:11 +0100 | [diff] [blame] | 773 | !CBB_add_u16(&body, SSL_CIPHER_get_protocol_id(hs->new_cipher)) || |
Robert Sloan | 0da4395 | 2018-01-03 15:13:14 -0800 | [diff] [blame] | 774 | !CBB_add_u8(&body, 0) || |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 775 | !CBB_add_u16_length_prefixed(&body, &extensions) || |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 776 | !ssl_ext_pre_shared_key_add_serverhello(hs, &extensions) || |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 777 | !ssl_ext_key_share_add_serverhello(hs, &extensions) || |
Robert Sloan | 0da4395 | 2018-01-03 15:13:14 -0800 | [diff] [blame] | 778 | !ssl_ext_supported_versions_add_serverhello(hs, &extensions) || |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 779 | !ssl->method->finish_message(ssl, cbb.get(), &server_hello)) { |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 780 | return ssl_hs_error; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 781 | } |
| 782 | |
Pete Bentley | 2f26c21 | 2021-10-01 11:32:03 +0000 | [diff] [blame] | 783 | assert(ssl->s3->ech_status != ssl_ech_accepted || hs->ech_is_inner); |
| 784 | if (hs->ech_is_inner) { |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 785 | // Fill in the ECH confirmation signal. |
Pete Bentley | 2f26c21 | 2021-10-01 11:32:03 +0000 | [diff] [blame] | 786 | const size_t offset = ssl_ech_confirmation_signal_hello_offset(ssl); |
| 787 | Span<uint8_t> random_suffix = random.last(ECH_CONFIRMATION_SIGNAL_LEN); |
| 788 | if (!ssl_ech_accept_confirmation(hs, random_suffix, ssl->s3->client_random, |
| 789 | hs->transcript, |
| 790 | /*is_hrr=*/false, server_hello, offset)) { |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 791 | return ssl_hs_error; |
| 792 | } |
| 793 | |
| 794 | // Update |server_hello|. |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 795 | Span<uint8_t> server_hello_out = |
| 796 | MakeSpan(server_hello).subspan(offset, ECH_CONFIRMATION_SIGNAL_LEN); |
| 797 | OPENSSL_memcpy(server_hello_out.data(), random_suffix.data(), |
| 798 | ECH_CONFIRMATION_SIGNAL_LEN); |
| 799 | } |
| 800 | |
| 801 | if (!ssl->method->add_message(ssl, std::move(server_hello))) { |
| 802 | return ssl_hs_error; |
| 803 | } |
| 804 | |
| 805 | hs->ecdh_public_key.Reset(); // No longer needed. |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 806 | if (!ssl->s3->used_hello_retry_request && |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 807 | !ssl->method->add_change_cipher_spec(ssl)) { |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 808 | return ssl_hs_error; |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 809 | } |
| 810 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 811 | // Derive and enable the handshake traffic secrets. |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 812 | if (!tls13_derive_handshake_secrets(hs) || |
Robert Sloan | cbf5ea6 | 2018-11-05 11:56:34 -0800 | [diff] [blame] | 813 | !tls13_set_traffic_key(ssl, ssl_encryption_handshake, evp_aead_seal, |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 814 | hs->new_session.get(), |
Tobias Thierer | 5b7aef4 | 2019-08-23 11:08:22 +0100 | [diff] [blame] | 815 | hs->server_handshake_secret())) { |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 816 | return ssl_hs_error; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 817 | } |
| 818 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 819 | // Send EncryptedExtensions. |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 820 | if (!ssl->method->init_message(ssl, cbb.get(), &body, |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 821 | SSL3_MT_ENCRYPTED_EXTENSIONS) || |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 822 | !ssl_add_serverhello_tlsext(hs, &body) || |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 823 | !ssl_add_message_cbb(ssl, cbb.get())) { |
| 824 | return ssl_hs_error; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 825 | } |
| 826 | |
Robert Sloan | f6200e7 | 2017-07-10 08:09:18 -0700 | [diff] [blame] | 827 | if (!ssl->s3->session_reused) { |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 828 | // Determine whether to request a client certificate. |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 829 | hs->cert_request = !!(hs->config->verify_mode & SSL_VERIFY_PEER); |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 830 | // Only request a certificate if Channel ID isn't negotiated. |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 831 | if ((hs->config->verify_mode & SSL_VERIFY_PEER_IF_NO_OBC) && |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 832 | hs->channel_id_negotiated) { |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 833 | hs->cert_request = false; |
Robert Sloan | f6200e7 | 2017-07-10 08:09:18 -0700 | [diff] [blame] | 834 | } |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 835 | } |
| 836 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 837 | // Send a CertificateRequest, if necessary. |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 838 | if (hs->cert_request) { |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 839 | CBB cert_request_extensions, sigalg_contents, sigalgs_cbb; |
| 840 | if (!ssl->method->init_message(ssl, cbb.get(), &body, |
| 841 | SSL3_MT_CERTIFICATE_REQUEST) || |
| 842 | !CBB_add_u8(&body, 0 /* no certificate_request_context. */) || |
| 843 | !CBB_add_u16_length_prefixed(&body, &cert_request_extensions) || |
| 844 | !CBB_add_u16(&cert_request_extensions, |
| 845 | TLSEXT_TYPE_signature_algorithms) || |
| 846 | !CBB_add_u16_length_prefixed(&cert_request_extensions, |
| 847 | &sigalg_contents) || |
| 848 | !CBB_add_u16_length_prefixed(&sigalg_contents, &sigalgs_cbb) || |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 849 | !tls12_add_verify_sigalgs(hs, &sigalgs_cbb)) { |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 850 | return ssl_hs_error; |
| 851 | } |
| 852 | |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 853 | if (ssl_has_client_CAs(hs->config)) { |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 854 | CBB ca_contents; |
| 855 | if (!CBB_add_u16(&cert_request_extensions, |
| 856 | TLSEXT_TYPE_certificate_authorities) || |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 857 | !CBB_add_u16_length_prefixed(&cert_request_extensions, |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 858 | &ca_contents) || |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 859 | !ssl_add_client_CA_list(hs, &ca_contents) || |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 860 | !CBB_flush(&cert_request_extensions)) { |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 861 | return ssl_hs_error; |
| 862 | } |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 863 | } |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 864 | |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 865 | if (!ssl_add_message_cbb(ssl, cbb.get())) { |
| 866 | return ssl_hs_error; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 867 | } |
| 868 | } |
| 869 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 870 | // Send the server Certificate message, if necessary. |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 871 | if (!ssl->s3->session_reused) { |
Robert Sloan | 4c22c5f | 2019-03-01 15:53:37 -0800 | [diff] [blame] | 872 | if (!ssl_has_certificate(hs)) { |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 873 | OPENSSL_PUT_ERROR(SSL, SSL_R_NO_CERTIFICATE_SET); |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 874 | return ssl_hs_error; |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 875 | } |
| 876 | |
| 877 | if (!tls13_add_certificate(hs)) { |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 878 | return ssl_hs_error; |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 879 | } |
| 880 | |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 881 | hs->tls13_state = state13_send_server_certificate_verify; |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 882 | return ssl_hs_ok; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 883 | } |
| 884 | |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 885 | hs->tls13_state = state13_send_server_finished; |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 886 | return ssl_hs_ok; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 887 | } |
| 888 | |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 889 | static enum ssl_hs_wait_t do_send_server_certificate_verify(SSL_HANDSHAKE *hs) { |
| 890 | switch (tls13_add_certificate_verify(hs)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 891 | case ssl_private_key_success: |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 892 | hs->tls13_state = state13_send_server_finished; |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 893 | return ssl_hs_ok; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 894 | |
| 895 | case ssl_private_key_retry: |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 896 | hs->tls13_state = state13_send_server_certificate_verify; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 897 | return ssl_hs_private_key_operation; |
| 898 | |
| 899 | case ssl_private_key_failure: |
| 900 | return ssl_hs_error; |
| 901 | } |
| 902 | |
| 903 | assert(0); |
| 904 | return ssl_hs_error; |
| 905 | } |
| 906 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 907 | static enum ssl_hs_wait_t do_send_server_finished(SSL_HANDSHAKE *hs) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 908 | SSL *const ssl = hs->ssl; |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 909 | if (hs->hints_requested) { |
| 910 | return ssl_hs_hints_ready; |
| 911 | } |
| 912 | |
| 913 | hs->can_release_private_key = true; |
Robert Sloan | 4d1ac50 | 2017-02-06 08:36:14 -0800 | [diff] [blame] | 914 | if (!tls13_add_finished(hs) || |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 915 | // Update the secret to the master secret and derive traffic keys. |
Tobias Thierer | 5b7aef4 | 2019-08-23 11:08:22 +0100 | [diff] [blame] | 916 | !tls13_advance_key_schedule( |
| 917 | hs, MakeConstSpan(kZeroes, hs->transcript.DigestLen())) || |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 918 | !tls13_derive_application_secrets(hs) || |
Robert Sloan | cbf5ea6 | 2018-11-05 11:56:34 -0800 | [diff] [blame] | 919 | !tls13_set_traffic_key(ssl, ssl_encryption_application, evp_aead_seal, |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 920 | hs->new_session.get(), |
Tobias Thierer | 5b7aef4 | 2019-08-23 11:08:22 +0100 | [diff] [blame] | 921 | hs->server_traffic_secret_0())) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 922 | return ssl_hs_error; |
| 923 | } |
| 924 | |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 925 | hs->tls13_state = state13_send_half_rtt_ticket; |
| 926 | return hs->handback ? ssl_hs_handback : ssl_hs_ok; |
| 927 | } |
| 928 | |
| 929 | static enum ssl_hs_wait_t do_send_half_rtt_ticket(SSL_HANDSHAKE *hs) { |
| 930 | SSL *const ssl = hs->ssl; |
| 931 | |
Robert Sloan | 0da4395 | 2018-01-03 15:13:14 -0800 | [diff] [blame] | 932 | if (ssl->s3->early_data_accepted) { |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 933 | // If accepting 0-RTT, we send tickets half-RTT. This gets the tickets on |
| 934 | // the wire sooner and also avoids triggering a write on |SSL_read| when |
| 935 | // processing the client Finished. This requires computing the client |
Robert Sloan | d9e572d | 2018-08-27 12:27:00 -0700 | [diff] [blame] | 936 | // Finished early. See RFC 8446, section 4.6.1. |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 937 | static const uint8_t kEndOfEarlyData[4] = {SSL3_MT_END_OF_EARLY_DATA, 0, |
| 938 | 0, 0}; |
Tobias Thierer | 580fcaf | 2019-09-12 20:23:01 +0100 | [diff] [blame] | 939 | if (ssl->quic_method == nullptr && |
| 940 | !hs->transcript.Update(kEndOfEarlyData)) { |
Robert Sloan | 8542c08 | 2018-02-05 09:07:34 -0800 | [diff] [blame] | 941 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| 942 | return ssl_hs_error; |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 943 | } |
| 944 | |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 945 | size_t finished_len; |
Tobias Thierer | 5b7aef4 | 2019-08-23 11:08:22 +0100 | [diff] [blame] | 946 | if (!tls13_finished_mac(hs, hs->expected_client_finished().data(), |
| 947 | &finished_len, false /* client */)) { |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 948 | return ssl_hs_error; |
| 949 | } |
| 950 | |
Tobias Thierer | 5b7aef4 | 2019-08-23 11:08:22 +0100 | [diff] [blame] | 951 | if (finished_len != hs->expected_client_finished().size()) { |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 952 | OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); |
| 953 | return ssl_hs_error; |
| 954 | } |
| 955 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 956 | // Feed the predicted Finished into the transcript. This allows us to derive |
| 957 | // the resumption secret early and send half-RTT tickets. |
| 958 | // |
| 959 | // TODO(davidben): This will need to be updated for DTLS 1.3. |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 960 | assert(!SSL_is_dtls(hs->ssl)); |
Tobias Thierer | 5b7aef4 | 2019-08-23 11:08:22 +0100 | [diff] [blame] | 961 | assert(hs->expected_client_finished().size() <= 0xff); |
| 962 | uint8_t header[4] = { |
| 963 | SSL3_MT_FINISHED, 0, 0, |
| 964 | static_cast<uint8_t>(hs->expected_client_finished().size())}; |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 965 | bool unused_sent_tickets; |
Robert Sloan | 921ef2c | 2017-10-17 09:02:20 -0700 | [diff] [blame] | 966 | if (!hs->transcript.Update(header) || |
Tobias Thierer | 5b7aef4 | 2019-08-23 11:08:22 +0100 | [diff] [blame] | 967 | !hs->transcript.Update(hs->expected_client_finished()) || |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 968 | !tls13_derive_resumption_secret(hs) || |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 969 | !add_new_session_tickets(hs, &unused_sent_tickets)) { |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 970 | return ssl_hs_error; |
| 971 | } |
| 972 | } |
| 973 | |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 974 | hs->tls13_state = state13_read_second_client_flight; |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 975 | return ssl_hs_flush; |
| 976 | } |
| 977 | |
| 978 | static enum ssl_hs_wait_t do_read_second_client_flight(SSL_HANDSHAKE *hs) { |
| 979 | SSL *const ssl = hs->ssl; |
Robert Sloan | 0da4395 | 2018-01-03 15:13:14 -0800 | [diff] [blame] | 980 | if (ssl->s3->early_data_accepted) { |
Pete Bentley | f23caaf | 2020-09-22 18:02:11 +0100 | [diff] [blame] | 981 | if (!tls13_set_traffic_key(ssl, ssl_encryption_early_data, evp_aead_open, |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 982 | hs->new_session.get(), |
Tobias Thierer | 5b7aef4 | 2019-08-23 11:08:22 +0100 | [diff] [blame] | 983 | hs->early_traffic_secret())) { |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 984 | return ssl_hs_error; |
| 985 | } |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 986 | hs->can_early_write = true; |
| 987 | hs->can_early_read = true; |
| 988 | hs->in_early_data = true; |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 989 | } |
Tobias Thierer | 580fcaf | 2019-09-12 20:23:01 +0100 | [diff] [blame] | 990 | |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 991 | // QUIC doesn't use an EndOfEarlyData message (RFC 9001, section 8.3), so we |
| 992 | // switch to client_handshake_secret before the early return. |
Tobias Thierer | 580fcaf | 2019-09-12 20:23:01 +0100 | [diff] [blame] | 993 | if (ssl->quic_method != nullptr) { |
| 994 | if (!tls13_set_traffic_key(ssl, ssl_encryption_handshake, evp_aead_open, |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 995 | hs->new_session.get(), |
Tobias Thierer | 580fcaf | 2019-09-12 20:23:01 +0100 | [diff] [blame] | 996 | hs->client_handshake_secret())) { |
| 997 | return ssl_hs_error; |
| 998 | } |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 999 | hs->tls13_state = state13_process_end_of_early_data; |
Tobias Thierer | 580fcaf | 2019-09-12 20:23:01 +0100 | [diff] [blame] | 1000 | return ssl->s3->early_data_accepted ? ssl_hs_early_return : ssl_hs_ok; |
| 1001 | } |
| 1002 | |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1003 | hs->tls13_state = state13_process_end_of_early_data; |
Robert Sloan | 0da4395 | 2018-01-03 15:13:14 -0800 | [diff] [blame] | 1004 | return ssl->s3->early_data_accepted ? ssl_hs_read_end_of_early_data |
| 1005 | : ssl_hs_ok; |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 1006 | } |
| 1007 | |
| 1008 | static enum ssl_hs_wait_t do_process_end_of_early_data(SSL_HANDSHAKE *hs) { |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 1009 | SSL *const ssl = hs->ssl; |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 1010 | // In protocols that use EndOfEarlyData, we must consume the extra message and |
| 1011 | // switch to client_handshake_secret after the early return. |
| 1012 | if (ssl->quic_method == nullptr) { |
| 1013 | // If early data was not accepted, the EndOfEarlyData will be in the |
| 1014 | // discarded early data. |
| 1015 | if (hs->ssl->s3->early_data_accepted) { |
| 1016 | SSLMessage msg; |
| 1017 | if (!ssl->method->get_message(ssl, &msg)) { |
| 1018 | return ssl_hs_read_message; |
| 1019 | } |
| 1020 | if (!ssl_check_message_type(ssl, msg, SSL3_MT_END_OF_EARLY_DATA)) { |
| 1021 | return ssl_hs_error; |
| 1022 | } |
| 1023 | if (CBS_len(&msg.body) != 0) { |
| 1024 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
| 1025 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
| 1026 | return ssl_hs_error; |
| 1027 | } |
| 1028 | ssl->method->next_message(ssl); |
| 1029 | } |
| 1030 | if (!tls13_set_traffic_key(ssl, ssl_encryption_handshake, evp_aead_open, |
| 1031 | hs->new_session.get(), |
| 1032 | hs->client_handshake_secret())) { |
| 1033 | return ssl_hs_error; |
| 1034 | } |
| 1035 | } |
| 1036 | hs->tls13_state = state13_read_client_encrypted_extensions; |
| 1037 | return ssl_hs_ok; |
| 1038 | } |
| 1039 | |
| 1040 | static enum ssl_hs_wait_t do_read_client_encrypted_extensions( |
| 1041 | SSL_HANDSHAKE *hs) { |
| 1042 | SSL *const ssl = hs->ssl; |
| 1043 | // For now, only one extension uses client EncryptedExtensions. This function |
| 1044 | // may be generalized if others use it in the future. |
| 1045 | if (hs->new_session->has_application_settings && |
| 1046 | !ssl->s3->early_data_accepted) { |
Tobias Thierer | 5b7aef4 | 2019-08-23 11:08:22 +0100 | [diff] [blame] | 1047 | SSLMessage msg; |
| 1048 | if (!ssl->method->get_message(ssl, &msg)) { |
| 1049 | return ssl_hs_read_message; |
Robert Sloan | b1b54b8 | 2017-11-06 13:50:02 -0800 | [diff] [blame] | 1050 | } |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 1051 | if (!ssl_check_message_type(ssl, msg, SSL3_MT_ENCRYPTED_EXTENSIONS)) { |
Tobias Thierer | 5b7aef4 | 2019-08-23 11:08:22 +0100 | [diff] [blame] | 1052 | return ssl_hs_error; |
| 1053 | } |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 1054 | |
| 1055 | CBS body = msg.body, extensions; |
| 1056 | if (!CBS_get_u16_length_prefixed(&body, &extensions) || |
| 1057 | CBS_len(&body) != 0) { |
Tobias Thierer | 5b7aef4 | 2019-08-23 11:08:22 +0100 | [diff] [blame] | 1058 | OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 1059 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); |
Tobias Thierer | 5b7aef4 | 2019-08-23 11:08:22 +0100 | [diff] [blame] | 1060 | return ssl_hs_error; |
| 1061 | } |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 1062 | |
Pete Bentley | 2f26c21 | 2021-10-01 11:32:03 +0000 | [diff] [blame] | 1063 | SSLExtension application_settings(TLSEXT_TYPE_application_settings); |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 1064 | uint8_t alert = SSL_AD_DECODE_ERROR; |
Pete Bentley | 2f26c21 | 2021-10-01 11:32:03 +0000 | [diff] [blame] | 1065 | if (!ssl_parse_extensions(&extensions, &alert, {&application_settings}, |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 1066 | /*ignore_unknown=*/false)) { |
| 1067 | ssl_send_alert(ssl, SSL3_AL_FATAL, alert); |
| 1068 | return ssl_hs_error; |
| 1069 | } |
| 1070 | |
Pete Bentley | 2f26c21 | 2021-10-01 11:32:03 +0000 | [diff] [blame] | 1071 | if (!application_settings.present) { |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 1072 | OPENSSL_PUT_ERROR(SSL, SSL_R_MISSING_EXTENSION); |
| 1073 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_MISSING_EXTENSION); |
| 1074 | return ssl_hs_error; |
| 1075 | } |
| 1076 | |
| 1077 | // Note that, if 0-RTT was accepted, these values will already have been |
| 1078 | // initialized earlier. |
| 1079 | if (!hs->new_session->peer_application_settings.CopyFrom( |
Pete Bentley | 2f26c21 | 2021-10-01 11:32:03 +0000 | [diff] [blame] | 1080 | application_settings.data) || |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 1081 | !ssl_hash_message(hs, msg)) { |
| 1082 | ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); |
| 1083 | return ssl_hs_error; |
| 1084 | } |
| 1085 | |
Tobias Thierer | 5b7aef4 | 2019-08-23 11:08:22 +0100 | [diff] [blame] | 1086 | ssl->method->next_message(ssl); |
Robert Sloan | a12bf46 | 2017-07-17 07:08:26 -0700 | [diff] [blame] | 1087 | } |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 1088 | |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1089 | hs->tls13_state = state13_read_client_certificate; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1090 | return ssl_hs_ok; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1091 | } |
| 1092 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1093 | static enum ssl_hs_wait_t do_read_client_certificate(SSL_HANDSHAKE *hs) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1094 | SSL *const ssl = hs->ssl; |
| 1095 | if (!hs->cert_request) { |
Tobias Thierer | 5b7aef4 | 2019-08-23 11:08:22 +0100 | [diff] [blame] | 1096 | if (!ssl->s3->session_reused) { |
| 1097 | // OpenSSL returns X509_V_OK when no certificates are requested. This is |
| 1098 | // classed by them as a bug, but it's assumed by at least NGINX. (Only do |
| 1099 | // this in full handshakes as resumptions should carry over the previous |
| 1100 | // |verify_result|, though this is a no-op because servers do not |
| 1101 | // implement the client's odd soft-fail mode.) |
| 1102 | hs->new_session->verify_result = X509_V_OK; |
| 1103 | } |
David Benjamin | f0c4a6c | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1104 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 1105 | // Skip this state. |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1106 | hs->tls13_state = state13_read_channel_id; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1107 | return ssl_hs_ok; |
| 1108 | } |
| 1109 | |
Robert Sloan | 726e9d1 | 2018-09-11 11:45:04 -0700 | [diff] [blame] | 1110 | const bool allow_anonymous = |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 1111 | (hs->config->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) == 0; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1112 | SSLMessage msg; |
| 1113 | if (!ssl->method->get_message(ssl, &msg)) { |
| 1114 | return ssl_hs_read_message; |
| 1115 | } |
| 1116 | if (!ssl_check_message_type(ssl, msg, SSL3_MT_CERTIFICATE) || |
| 1117 | !tls13_process_certificate(hs, msg, allow_anonymous) || |
| 1118 | !ssl_hash_message(hs, msg)) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1119 | return ssl_hs_error; |
| 1120 | } |
| 1121 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1122 | ssl->method->next_message(ssl); |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1123 | hs->tls13_state = state13_read_client_certificate_verify; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1124 | return ssl_hs_ok; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1125 | } |
| 1126 | |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 1127 | static enum ssl_hs_wait_t do_read_client_certificate_verify(SSL_HANDSHAKE *hs) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1128 | SSL *const ssl = hs->ssl; |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 1129 | if (sk_CRYPTO_BUFFER_num(hs->new_session->certs.get()) == 0) { |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 1130 | // Skip this state. |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1131 | hs->tls13_state = state13_read_channel_id; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1132 | return ssl_hs_ok; |
| 1133 | } |
| 1134 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1135 | SSLMessage msg; |
| 1136 | if (!ssl->method->get_message(ssl, &msg)) { |
| 1137 | return ssl_hs_read_message; |
| 1138 | } |
| 1139 | |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1140 | switch (ssl_verify_peer_cert(hs)) { |
| 1141 | case ssl_verify_ok: |
| 1142 | break; |
| 1143 | case ssl_verify_invalid: |
| 1144 | return ssl_hs_error; |
| 1145 | case ssl_verify_retry: |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1146 | hs->tls13_state = state13_read_client_certificate_verify; |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1147 | return ssl_hs_certificate_verify; |
| 1148 | } |
| 1149 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1150 | if (!ssl_check_message_type(ssl, msg, SSL3_MT_CERTIFICATE_VERIFY) || |
| 1151 | !tls13_process_certificate_verify(hs, msg) || |
| 1152 | !ssl_hash_message(hs, msg)) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 1153 | return ssl_hs_error; |
| 1154 | } |
| 1155 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1156 | ssl->method->next_message(ssl); |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1157 | hs->tls13_state = state13_read_channel_id; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1158 | return ssl_hs_ok; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 1159 | } |
| 1160 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1161 | static enum ssl_hs_wait_t do_read_channel_id(SSL_HANDSHAKE *hs) { |
| 1162 | SSL *const ssl = hs->ssl; |
Pete Bentley | 00a7c40 | 2021-07-23 17:57:12 +0100 | [diff] [blame] | 1163 | if (!hs->channel_id_negotiated) { |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1164 | hs->tls13_state = state13_read_client_finished; |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 1165 | return ssl_hs_ok; |
| 1166 | } |
| 1167 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1168 | SSLMessage msg; |
| 1169 | if (!ssl->method->get_message(ssl, &msg)) { |
| 1170 | return ssl_hs_read_message; |
| 1171 | } |
| 1172 | if (!ssl_check_message_type(ssl, msg, SSL3_MT_CHANNEL_ID) || |
| 1173 | !tls1_verify_channel_id(hs, msg) || |
| 1174 | !ssl_hash_message(hs, msg)) { |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 1175 | return ssl_hs_error; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1176 | } |
| 1177 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1178 | ssl->method->next_message(ssl); |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1179 | hs->tls13_state = state13_read_client_finished; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1180 | return ssl_hs_ok; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1181 | } |
| 1182 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1183 | static enum ssl_hs_wait_t do_read_client_finished(SSL_HANDSHAKE *hs) { |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1184 | SSL *const ssl = hs->ssl; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1185 | SSLMessage msg; |
| 1186 | if (!ssl->method->get_message(ssl, &msg)) { |
| 1187 | return ssl_hs_read_message; |
| 1188 | } |
| 1189 | if (!ssl_check_message_type(ssl, msg, SSL3_MT_FINISHED) || |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 1190 | // If early data was accepted, we've already computed the client Finished |
| 1191 | // and derived the resumption secret. |
Robert Sloan | 0da4395 | 2018-01-03 15:13:14 -0800 | [diff] [blame] | 1192 | !tls13_process_finished(hs, msg, ssl->s3->early_data_accepted) || |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 1193 | // evp_aead_seal keys have already been switched. |
Robert Sloan | cbf5ea6 | 2018-11-05 11:56:34 -0800 | [diff] [blame] | 1194 | !tls13_set_traffic_key(ssl, ssl_encryption_application, evp_aead_open, |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1195 | hs->new_session.get(), |
Tobias Thierer | 5b7aef4 | 2019-08-23 11:08:22 +0100 | [diff] [blame] | 1196 | hs->client_traffic_secret_0())) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1197 | return ssl_hs_error; |
| 1198 | } |
| 1199 | |
Robert Sloan | 0da4395 | 2018-01-03 15:13:14 -0800 | [diff] [blame] | 1200 | if (!ssl->s3->early_data_accepted) { |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1201 | if (!ssl_hash_message(hs, msg) || |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 1202 | !tls13_derive_resumption_secret(hs)) { |
| 1203 | return ssl_hs_error; |
| 1204 | } |
| 1205 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 1206 | // We send post-handshake tickets as part of the handshake in 1-RTT. |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1207 | hs->tls13_state = state13_send_new_session_ticket; |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1208 | } else { |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 1209 | // We already sent half-RTT tickets. |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1210 | hs->tls13_state = state13_done; |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 1211 | } |
| 1212 | |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1213 | ssl->method->next_message(ssl); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1214 | return ssl_hs_ok; |
| 1215 | } |
| 1216 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1217 | static enum ssl_hs_wait_t do_send_new_session_ticket(SSL_HANDSHAKE *hs) { |
Adam Vartanian | bfcf3a7 | 2018-08-10 14:55:24 +0100 | [diff] [blame] | 1218 | bool sent_tickets; |
| 1219 | if (!add_new_session_tickets(hs, &sent_tickets)) { |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 1220 | return ssl_hs_error; |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 1221 | } |
| 1222 | |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1223 | hs->tls13_state = state13_done; |
Pete Bentley | 0c61efe | 2019-08-13 09:32:23 +0100 | [diff] [blame] | 1224 | // In TLS 1.3, the NewSessionTicket isn't flushed until the server performs a |
| 1225 | // write, to prevent a non-reading client from causing the server to hang in |
| 1226 | // the case of a small server write buffer. Consumers which don't write data |
| 1227 | // to the client will need to do a zero-byte write if they wish to flush the |
| 1228 | // tickets. |
Tobias Thierer | 01e077a | 2019-10-09 20:48:13 +0100 | [diff] [blame] | 1229 | if (hs->ssl->quic_method != nullptr && sent_tickets) { |
Pete Bentley | 0c61efe | 2019-08-13 09:32:23 +0100 | [diff] [blame] | 1230 | return ssl_hs_flush; |
| 1231 | } |
| 1232 | return ssl_hs_ok; |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1233 | } |
| 1234 | |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1235 | enum ssl_hs_wait_t tls13_server_handshake(SSL_HANDSHAKE *hs) { |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1236 | while (hs->tls13_state != state13_done) { |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1237 | enum ssl_hs_wait_t ret = ssl_hs_error; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1238 | enum tls13_server_hs_state_t state = |
| 1239 | static_cast<enum tls13_server_hs_state_t>(hs->tls13_state); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1240 | switch (state) { |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1241 | case state13_select_parameters: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1242 | ret = do_select_parameters(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1243 | break; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1244 | case state13_select_session: |
Robert Sloan | 1c9db53 | 2017-03-13 08:03:59 -0700 | [diff] [blame] | 1245 | ret = do_select_session(hs); |
| 1246 | break; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1247 | case state13_send_hello_retry_request: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1248 | ret = do_send_hello_retry_request(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1249 | break; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1250 | case state13_read_second_client_hello: |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1251 | ret = do_read_second_client_hello(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1252 | break; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1253 | case state13_send_server_hello: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1254 | ret = do_send_server_hello(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1255 | break; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1256 | case state13_send_server_certificate_verify: |
Robert Sloan | e56da3e | 2017-06-26 08:26:42 -0700 | [diff] [blame] | 1257 | ret = do_send_server_certificate_verify(hs); |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 1258 | break; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1259 | case state13_send_server_finished: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1260 | ret = do_send_server_finished(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1261 | break; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1262 | case state13_send_half_rtt_ticket: |
| 1263 | ret = do_send_half_rtt_ticket(hs); |
| 1264 | break; |
| 1265 | case state13_read_second_client_flight: |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 1266 | ret = do_read_second_client_flight(hs); |
| 1267 | break; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1268 | case state13_process_end_of_early_data: |
Robert Sloan | 6d0d00e | 2017-03-27 07:13:07 -0700 | [diff] [blame] | 1269 | ret = do_process_end_of_early_data(hs); |
| 1270 | break; |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 1271 | case state13_read_client_encrypted_extensions: |
| 1272 | ret = do_read_client_encrypted_extensions(hs); |
| 1273 | break; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1274 | case state13_read_client_certificate: |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1275 | ret = do_read_client_certificate(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1276 | break; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1277 | case state13_read_client_certificate_verify: |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1278 | ret = do_read_client_certificate_verify(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1279 | break; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1280 | case state13_read_channel_id: |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1281 | ret = do_read_channel_id(hs); |
Steven Valdez | 909b19f | 2016-11-21 15:35:44 -0500 | [diff] [blame] | 1282 | break; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1283 | case state13_read_client_finished: |
Robert Sloan | 8437709 | 2017-08-14 09:33:19 -0700 | [diff] [blame] | 1284 | ret = do_read_client_finished(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1285 | break; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1286 | case state13_send_new_session_ticket: |
David Benjamin | 1b24967 | 2016-12-06 18:25:50 -0500 | [diff] [blame] | 1287 | ret = do_send_new_session_ticket(hs); |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1288 | break; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1289 | case state13_done: |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1290 | ret = ssl_hs_ok; |
| 1291 | break; |
| 1292 | } |
| 1293 | |
Robert Sloan | a27a6a4 | 2017-09-05 08:39:28 -0700 | [diff] [blame] | 1294 | if (hs->tls13_state != state) { |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 1295 | ssl_do_info_callback(hs->ssl, SSL_CB_ACCEPT_LOOP, 1); |
| 1296 | } |
| 1297 | |
David Benjamin | c895d6b | 2016-08-11 13:26:41 -0400 | [diff] [blame] | 1298 | if (ret != ssl_hs_ok) { |
| 1299 | return ret; |
| 1300 | } |
| 1301 | } |
| 1302 | |
| 1303 | return ssl_hs_ok; |
| 1304 | } |
Robert Sloan | b6d070c | 2017-07-24 08:40:01 -0700 | [diff] [blame] | 1305 | |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 1306 | const char *tls13_server_handshake_state(SSL_HANDSHAKE *hs) { |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1307 | enum tls13_server_hs_state_t state = |
| 1308 | static_cast<enum tls13_server_hs_state_t>(hs->tls13_state); |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 1309 | switch (state) { |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1310 | case state13_select_parameters: |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 1311 | return "TLS 1.3 server select_parameters"; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1312 | case state13_select_session: |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 1313 | return "TLS 1.3 server select_session"; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1314 | case state13_send_hello_retry_request: |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 1315 | return "TLS 1.3 server send_hello_retry_request"; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1316 | case state13_read_second_client_hello: |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 1317 | return "TLS 1.3 server read_second_client_hello"; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1318 | case state13_send_server_hello: |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 1319 | return "TLS 1.3 server send_server_hello"; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1320 | case state13_send_server_certificate_verify: |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 1321 | return "TLS 1.3 server send_server_certificate_verify"; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1322 | case state13_send_half_rtt_ticket: |
| 1323 | return "TLS 1.3 server send_half_rtt_ticket"; |
| 1324 | case state13_send_server_finished: |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 1325 | return "TLS 1.3 server send_server_finished"; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1326 | case state13_read_second_client_flight: |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 1327 | return "TLS 1.3 server read_second_client_flight"; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1328 | case state13_process_end_of_early_data: |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 1329 | return "TLS 1.3 server process_end_of_early_data"; |
Pete Bentley | 1748611 | 2021-01-20 11:51:47 +0000 | [diff] [blame] | 1330 | case state13_read_client_encrypted_extensions: |
| 1331 | return "TLS 1.3 server read_client_encrypted_extensions"; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1332 | case state13_read_client_certificate: |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 1333 | return "TLS 1.3 server read_client_certificate"; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1334 | case state13_read_client_certificate_verify: |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 1335 | return "TLS 1.3 server read_client_certificate_verify"; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1336 | case state13_read_channel_id: |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 1337 | return "TLS 1.3 server read_channel_id"; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1338 | case state13_read_client_finished: |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 1339 | return "TLS 1.3 server read_client_finished"; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1340 | case state13_send_new_session_ticket: |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 1341 | return "TLS 1.3 server send_new_session_ticket"; |
Tobias Thierer | 43be7d2 | 2020-03-02 19:23:34 +0000 | [diff] [blame] | 1342 | case state13_done: |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 1343 | return "TLS 1.3 server done"; |
| 1344 | } |
| 1345 | |
| 1346 | return "TLS 1.3 server unknown"; |
| 1347 | } |
| 1348 | |
Robert Sloan | 726e9d1 | 2018-09-11 11:45:04 -0700 | [diff] [blame] | 1349 | BSSL_NAMESPACE_END |