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boringssl/ssl/handoff.cc
David Benjamin 4685376b2b Remove other unnecessary tlsext_ prefixes. 
Change-Id: Ib31a12527006ff57beb99bcfd0bf1f906773e1ca
Reviewed-on: https://boringssl-review.googlesource.com/29593
Reviewed-by: Adam Langley <agl@google.com>
2018-07-06 19:49:13 +00:00

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/* Copyright (c) 2018, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#include <openssl/ssl.h>
#include <openssl/bytestring.h>
#include "internal.h"
namespace bssl {
constexpr int kHandoffVersion = 0;
constexpr int kHandbackVersion = 0;
bool SSL_serialize_handoff(const SSL *ssl, CBB *out) {
const SSL3_STATE *const s3 = ssl->s3;
if (!ssl->server ||
s3->hs == nullptr ||
s3->rwstate != SSL_HANDOFF) {
return false;
}
CBB seq;
Span<const uint8_t> transcript = s3->hs->transcript.buffer();
if (!CBB_add_asn1(out, &seq, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1_uint64(&seq, kHandoffVersion) ||
!CBB_add_asn1_octet_string(&seq, transcript.data(), transcript.size()) ||
!CBB_add_asn1_octet_string(&seq,
reinterpret_cast<uint8_t *>(s3->hs_buf->data),
s3->hs_buf->length) ||
!CBB_flush(out)) {
return false;
}
return true;
}
bool SSL_decline_handoff(SSL *ssl) {
const SSL3_STATE *const s3 = ssl->s3;
if (!ssl->server ||
s3->hs == nullptr ||
s3->rwstate != SSL_HANDOFF) {
return false;
}
s3->hs->config->handoff = false;
return true;
}
bool SSL_apply_handoff(SSL *ssl, Span<const uint8_t> handoff) {
if (ssl->method->is_dtls) {
return false;
}
CBS seq, handoff_cbs(handoff);
uint64_t handoff_version;
if (!CBS_get_asn1(&handoff_cbs, &seq, CBS_ASN1_SEQUENCE) ||
!CBS_get_asn1_uint64(&seq, &handoff_version) ||
handoff_version != kHandoffVersion) {
return false;
}
CBS transcript, hs_buf;
if (!CBS_get_asn1(&seq, &transcript, CBS_ASN1_OCTETSTRING) ||
!CBS_get_asn1(&seq, &hs_buf, CBS_ASN1_OCTETSTRING)) {
return false;
}
SSL_set_accept_state(ssl);
SSL3_STATE *const s3 = ssl->s3;
s3->v2_hello_done = true;
s3->has_message = true;
s3->hs_buf.reset(BUF_MEM_new());
if (!s3->hs_buf ||
!BUF_MEM_append(s3->hs_buf.get(), CBS_data(&hs_buf), CBS_len(&hs_buf))) {
return false;
}
if (CBS_len(&transcript) != 0) {
s3->hs->transcript.Update(transcript);
s3->is_v2_hello = true;
}
s3->hs->handback = true;
return true;
}
bool SSL_serialize_handback(const SSL *ssl, CBB *out) {
if (!ssl->server || ssl->method->is_dtls) {
return false;
}
handback_t type;
switch (ssl->s3->hs->state) {
case state12_read_change_cipher_spec:
type = handback_after_session_resumption;
break;
case state12_read_client_certificate:
type = handback_after_ecdhe;
break;
case state12_finish_server_handshake:
type = handback_after_handshake;
break;
default:
return false;
}
const SSL3_STATE *const s3 = ssl->s3;
size_t hostname_len = 0;
if (s3->hostname) {
hostname_len = strlen(s3->hostname.get());
}
Span<const uint8_t> transcript;
if (type == handback_after_ecdhe ||
type == handback_after_session_resumption) {
transcript = s3->hs->transcript.buffer();
}
size_t write_iv_len = 0;
const uint8_t *write_iv = nullptr;
if ((type == handback_after_session_resumption ||
type == handback_after_handshake) &&
ssl->version == TLS1_VERSION &&
SSL_CIPHER_is_block_cipher(s3->aead_write_ctx->cipher()) &&
!s3->aead_write_ctx->GetIV(&write_iv, &write_iv_len)) {
return false;
}
size_t read_iv_len = 0;
const uint8_t *read_iv = nullptr;
if (type == handback_after_handshake &&
ssl->version == TLS1_VERSION &&
SSL_CIPHER_is_block_cipher(s3->aead_read_ctx->cipher()) &&
!s3->aead_read_ctx->GetIV(&read_iv, &read_iv_len)) {
return false;
}
// TODO(mab): make sure everything is serialized.
CBB seq, key_share;
const SSL_SESSION *session =
s3->session_reused ? ssl->session.get() : s3->hs->new_session.get();
if (!CBB_add_asn1(out, &seq, CBS_ASN1_SEQUENCE) ||
!CBB_add_asn1_uint64(&seq, kHandbackVersion) ||
!CBB_add_asn1_uint64(&seq, type) ||
!CBB_add_asn1_octet_string(&seq, s3->read_sequence,
sizeof(s3->read_sequence)) ||
!CBB_add_asn1_octet_string(&seq, s3->write_sequence,
sizeof(s3->write_sequence)) ||
!CBB_add_asn1_octet_string(&seq, s3->server_random,
sizeof(s3->server_random)) ||
!CBB_add_asn1_octet_string(&seq, s3->client_random,
sizeof(s3->client_random)) ||
!CBB_add_asn1_octet_string(&seq, read_iv, read_iv_len) ||
!CBB_add_asn1_octet_string(&seq, write_iv, write_iv_len) ||
!CBB_add_asn1_bool(&seq, s3->session_reused) ||
!CBB_add_asn1_bool(&seq, s3->channel_id_valid) ||
!ssl_session_serialize(session, &seq) ||
!CBB_add_asn1_octet_string(&seq, s3->next_proto_negotiated.data(),
s3->next_proto_negotiated.size()) ||
!CBB_add_asn1_octet_string(&seq, s3->alpn_selected.data(),
s3->alpn_selected.size()) ||
!CBB_add_asn1_octet_string(
&seq, reinterpret_cast<uint8_t *>(s3->hostname.get()),
hostname_len) ||
!CBB_add_asn1_octet_string(&seq, s3->channel_id,
sizeof(s3->channel_id)) ||
!CBB_add_asn1_bool(&seq, ssl->s3->token_binding_negotiated) ||
!CBB_add_asn1_uint64(&seq, ssl->s3->negotiated_token_binding_param) ||
!CBB_add_asn1_bool(&seq, s3->hs->next_proto_neg_seen) ||
!CBB_add_asn1_bool(&seq, s3->hs->cert_request) ||
!CBB_add_asn1_bool(&seq, s3->hs->extended_master_secret) ||
!CBB_add_asn1_bool(&seq, s3->hs->ticket_expected) ||
!CBB_add_asn1_uint64(&seq, SSL_CIPHER_get_id(s3->hs->new_cipher)) ||
!CBB_add_asn1_octet_string(&seq, transcript.data(), transcript.size()) ||
!CBB_add_asn1(&seq, &key_share, CBS_ASN1_SEQUENCE)) {
return false;
}
if (type == handback_after_ecdhe &&
!s3->hs->key_share->Serialize(&key_share)) {
return false;
}
return CBB_flush(out);
}
bool SSL_apply_handback(SSL *ssl, Span<const uint8_t> handback) {
if (ssl->do_handshake != nullptr ||
ssl->method->is_dtls) {
return false;
}
SSL3_STATE *const s3 = ssl->s3;
uint64_t handback_version, negotiated_token_binding_param, cipher, type;
CBS seq, read_seq, write_seq, server_rand, client_rand, read_iv, write_iv,
next_proto, alpn, hostname, channel_id, transcript, key_share;
int session_reused, channel_id_valid, cert_request, extended_master_secret,
ticket_expected, token_binding_negotiated, next_proto_neg_seen;
SSL_SESSION *session = nullptr;
CBS handback_cbs(handback);
if (!CBS_get_asn1(&handback_cbs, &seq, CBS_ASN1_SEQUENCE) ||
!CBS_get_asn1_uint64(&seq, &handback_version) ||
handback_version != kHandbackVersion ||
!CBS_get_asn1_uint64(&seq, &type)) {
return false;
}
if (!CBS_get_asn1(&seq, &read_seq, CBS_ASN1_OCTETSTRING) ||
CBS_len(&read_seq) != sizeof(s3->read_sequence) ||
!CBS_get_asn1(&seq, &write_seq, CBS_ASN1_OCTETSTRING) ||
CBS_len(&write_seq) != sizeof(s3->write_sequence) ||
!CBS_get_asn1(&seq, &server_rand, CBS_ASN1_OCTETSTRING) ||
CBS_len(&server_rand) != sizeof(s3->server_random) ||
!CBS_copy_bytes(&server_rand, s3->server_random,
sizeof(s3->server_random)) ||
!CBS_get_asn1(&seq, &client_rand, CBS_ASN1_OCTETSTRING) ||
CBS_len(&client_rand) != sizeof(s3->client_random) ||
!CBS_copy_bytes(&client_rand, s3->client_random,
sizeof(s3->client_random)) ||
!CBS_get_asn1(&seq, &read_iv, CBS_ASN1_OCTETSTRING) ||
!CBS_get_asn1(&seq, &write_iv, CBS_ASN1_OCTETSTRING) ||
!CBS_get_asn1_bool(&seq, &session_reused) ||
!CBS_get_asn1_bool(&seq, &channel_id_valid)) {
return false;
}
s3->hs = ssl_handshake_new(ssl);
if (session_reused) {
ssl->session =
SSL_SESSION_parse(&seq, ssl->ctx->x509_method, ssl->ctx->pool);
session = ssl->session.get();
} else {
s3->hs->new_session =
SSL_SESSION_parse(&seq, ssl->ctx->x509_method, ssl->ctx->pool);
session = s3->hs->new_session.get();
}
if (!session || !CBS_get_asn1(&seq, &next_proto, CBS_ASN1_OCTETSTRING) ||
!CBS_get_asn1(&seq, &alpn, CBS_ASN1_OCTETSTRING) ||
!CBS_get_asn1(&seq, &hostname, CBS_ASN1_OCTETSTRING) ||
!CBS_get_asn1(&seq, &channel_id, CBS_ASN1_OCTETSTRING) ||
CBS_len(&channel_id) != sizeof(s3->channel_id) ||
!CBS_copy_bytes(&channel_id, s3->channel_id,
sizeof(s3->channel_id)) ||
!CBS_get_asn1_bool(&seq, &token_binding_negotiated) ||
!CBS_get_asn1_uint64(&seq, &negotiated_token_binding_param) ||
!CBS_get_asn1_bool(&seq, &next_proto_neg_seen) ||
!CBS_get_asn1_bool(&seq, &cert_request) ||
!CBS_get_asn1_bool(&seq, &extended_master_secret) ||
!CBS_get_asn1_bool(&seq, &ticket_expected) ||
!CBS_get_asn1_uint64(&seq, &cipher)) {
return false;
}
if ((s3->hs->new_cipher =
SSL_get_cipher_by_value(static_cast<uint16_t>(cipher))) == nullptr) {
return false;
}
if (!CBS_get_asn1(&seq, &transcript, CBS_ASN1_OCTETSTRING) ||
!CBS_get_asn1(&seq, &key_share, CBS_ASN1_SEQUENCE)) {
return false;
}
ssl->version = session->ssl_version;
s3->have_version = true;
if (!ssl_method_supports_version(ssl->method, ssl->version) ||
session->cipher != s3->hs->new_cipher ||
ssl_protocol_version(ssl) < SSL_CIPHER_get_min_version(session->cipher) ||
SSL_CIPHER_get_max_version(session->cipher) < ssl_protocol_version(ssl)) {
return false;
}
ssl->do_handshake = ssl_server_handshake;
ssl->server = true;
switch (type) {
case handback_after_session_resumption:
ssl->s3->hs->state = state12_read_change_cipher_spec;
if (!session_reused) {
return false;
}
break;
case handback_after_ecdhe:
ssl->s3->hs->state = state12_read_client_certificate;
if (session_reused) {
return false;
}
break;
case handback_after_handshake:
ssl->s3->hs->state = state12_finish_server_handshake;
break;
default:
return false;
}
s3->session_reused = session_reused;
s3->channel_id_valid = channel_id_valid;
s3->next_proto_negotiated.CopyFrom(next_proto);
s3->alpn_selected.CopyFrom(alpn);
const size_t hostname_len = CBS_len(&hostname);
if (hostname_len == 0) {
s3->hostname.reset();
} else {
char *hostname_str = nullptr;
if (!CBS_strdup(&hostname, &hostname_str)) {
return false;
}
s3->hostname.reset(hostname_str);
}
s3->token_binding_negotiated = token_binding_negotiated;
s3->negotiated_token_binding_param =
static_cast<uint8_t>(negotiated_token_binding_param);
s3->hs->next_proto_neg_seen = next_proto_neg_seen;
s3->hs->wait = ssl_hs_flush;
s3->hs->extended_master_secret = extended_master_secret;
s3->hs->ticket_expected = ticket_expected;
s3->aead_write_ctx->SetVersionIfNullCipher(ssl->version);
s3->hs->cert_request = cert_request;
Array<uint8_t> key_block;
if ((type == handback_after_session_resumption ||
type == handback_after_handshake) &&
(!tls1_configure_aead(ssl, evp_aead_seal, &key_block, session->cipher,
write_iv) ||
!CBS_copy_bytes(&write_seq, s3->write_sequence,
sizeof(s3->write_sequence)))) {
return false;
}
if (type == handback_after_handshake &&
(!tls1_configure_aead(ssl, evp_aead_open, &key_block, session->cipher,
read_iv) ||
!CBS_copy_bytes(&read_seq, s3->read_sequence,
sizeof(s3->read_sequence)))) {
return false;
}
if ((type == handback_after_ecdhe ||
type == handback_after_session_resumption) &&
(!s3->hs->transcript.Init() ||
!s3->hs->transcript.InitHash(ssl_protocol_version(ssl),
s3->hs->new_cipher) ||
!s3->hs->transcript.Update(transcript))) {
return false;
}
if (type == handback_after_ecdhe &&
(s3->hs->key_share = SSLKeyShare::Create(&key_share)) == nullptr) {
return false;
}
return CBS_len(&seq) == 0;
}
} // namespace bssl
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