/
statem_lib.c
2443 lines (2184 loc) Β· 80.1 KB
/
statem_lib.c
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/*
* Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
* Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <limits.h>
#include <string.h>
#include <stdio.h>
#include "../ssl_local.h"
#include "statem_local.h"
#include "internal/cryptlib.h"
#include <openssl/buffer.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/x509.h>
/*
* Map error codes to TLS/SSL alart types.
*/
typedef struct x509err2alert_st {
int x509err;
int alert;
} X509ERR2ALERT;
/* Fixed value used in the ServerHello random field to identify an HRR */
const unsigned char hrrrandom[] = {
0xcf, 0x21, 0xad, 0x74, 0xe5, 0x9a, 0x61, 0x11, 0xbe, 0x1d, 0x8c, 0x02,
0x1e, 0x65, 0xb8, 0x91, 0xc2, 0xa2, 0x11, 0x16, 0x7a, 0xbb, 0x8c, 0x5e,
0x07, 0x9e, 0x09, 0xe2, 0xc8, 0xa8, 0x33, 0x9c
};
/*
* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or
* SSL3_RT_CHANGE_CIPHER_SPEC)
*/
int ssl3_do_write(SSL *s, int type)
{
int ret;
size_t written = 0;
#ifndef OPENSSL_NO_QUIC
if (SSL_IS_QUIC(s)) {
if (type == SSL3_RT_HANDSHAKE) {
ret = s->quic_method->add_handshake_data(s, s->quic_write_level,
(const uint8_t*)&s->init_buf->data[s->init_off],
s->init_num);
if (!ret) {
ret = -1;
/* QUIC can't sent anything out sice the above failed */
SSLerr(SSL_F_SSL3_DO_WRITE, SSL_R_INTERNAL_ERROR);
} else {
written = s->init_num;
}
} else {
/* QUIC doesn't use ChangeCipherSpec */
ret = -1;
SSLerr(SSL_F_SSL3_DO_WRITE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
}
} else
#endif
ret = ssl3_write_bytes(s, type, &s->init_buf->data[s->init_off],
s->init_num, &written);
if (ret < 0)
return -1;
if (type == SSL3_RT_HANDSHAKE)
/*
* should not be done for 'Hello Request's, but in that case we'll
* ignore the result anyway
* TLS1.3 KeyUpdate and NewSessionTicket do not need to be added
*/
if (!SSL_IS_TLS13(s) || (s->statem.hand_state != TLS_ST_SW_SESSION_TICKET
&& s->statem.hand_state != TLS_ST_CW_KEY_UPDATE
&& s->statem.hand_state != TLS_ST_SW_KEY_UPDATE))
if (!ssl3_finish_mac(s,
(unsigned char *)&s->init_buf->data[s->init_off],
written))
return -1;
if (written == s->init_num) {
if (s->msg_callback)
s->msg_callback(1, s->version, type, s->init_buf->data,
(size_t)(s->init_off + s->init_num), s,
s->msg_callback_arg);
return 1;
}
s->init_off += written;
s->init_num -= written;
return 0;
}
int tls_close_construct_packet(SSL *s, WPACKET *pkt, int htype)
{
size_t msglen;
if ((htype != SSL3_MT_CHANGE_CIPHER_SPEC && !WPACKET_close(pkt))
|| !WPACKET_get_length(pkt, &msglen)
|| msglen > INT_MAX)
return 0;
s->init_num = (int)msglen;
s->init_off = 0;
return 1;
}
int tls_setup_handshake(SSL *s)
{
if (!ssl3_init_finished_mac(s)) {
/* SSLfatal() already called */
return 0;
}
/* Reset any extension flags */
memset(s->ext.extflags, 0, sizeof(s->ext.extflags));
if (s->server) {
STACK_OF(SSL_CIPHER) *ciphers = SSL_get_ciphers(s);
int i, ver_min, ver_max, ok = 0;
/*
* Sanity check that the maximum version we accept has ciphers
* enabled. For clients we do this check during construction of the
* ClientHello.
*/
if (ssl_get_min_max_version(s, &ver_min, &ver_max, NULL) != 0) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_SETUP_HANDSHAKE,
ERR_R_INTERNAL_ERROR);
return 0;
}
for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
const SSL_CIPHER *c = sk_SSL_CIPHER_value(ciphers, i);
if (SSL_IS_DTLS(s)) {
if (DTLS_VERSION_GE(ver_max, c->min_dtls) &&
DTLS_VERSION_LE(ver_max, c->max_dtls))
ok = 1;
} else if (ver_max >= c->min_tls && ver_max <= c->max_tls) {
ok = 1;
}
if (ok)
break;
}
if (!ok) {
SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS_SETUP_HANDSHAKE,
SSL_R_NO_CIPHERS_AVAILABLE);
ERR_add_error_data(1, "No ciphers enabled for max supported "
"SSL/TLS version");
return 0;
}
if (SSL_IS_FIRST_HANDSHAKE(s)) {
/* N.B. s->session_ctx == s->ctx here */
tsan_counter(&s->session_ctx->stats.sess_accept);
} else {
/* N.B. s->ctx may not equal s->session_ctx */
tsan_counter(&s->ctx->stats.sess_accept_renegotiate);
s->s3->tmp.cert_request = 0;
}
} else {
if (SSL_IS_FIRST_HANDSHAKE(s))
tsan_counter(&s->session_ctx->stats.sess_connect);
else
tsan_counter(&s->session_ctx->stats.sess_connect_renegotiate);
/* mark client_random uninitialized */
memset(s->s3->client_random, 0, sizeof(s->s3->client_random));
s->hit = 0;
s->s3->tmp.cert_req = 0;
if (SSL_IS_DTLS(s))
s->statem.use_timer = 1;
}
return 1;
}
/*
* Size of the to-be-signed TLS13 data, without the hash size itself:
* 64 bytes of value 32, 33 context bytes, 1 byte separator
*/
#define TLS13_TBS_START_SIZE 64
#define TLS13_TBS_PREAMBLE_SIZE (TLS13_TBS_START_SIZE + 33 + 1)
static int get_cert_verify_tbs_data(SSL *s, unsigned char *tls13tbs,
void **hdata, size_t *hdatalen)
{
#ifdef CHARSET_EBCDIC
static const char servercontext[] = { 0x54, 0x4c, 0x53, 0x20, 0x31, 0x2e,
0x33, 0x2c, 0x20, 0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x20, 0x43, 0x65,
0x72, 0x74, 0x69, 0x66, 0x69, 0x63, 0x61, 0x74, 0x65, 0x56, 0x65, 0x72,
0x69, 0x66, 0x79, 0x00 };
static const char clientcontext[] = { 0x54, 0x4c, 0x53, 0x20, 0x31, 0x2e,
0x33, 0x2c, 0x20, 0x63, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x20, 0x43, 0x65,
0x72, 0x74, 0x69, 0x66, 0x69, 0x63, 0x61, 0x74, 0x65, 0x56, 0x65, 0x72,
0x69, 0x66, 0x79, 0x00 };
#else
static const char servercontext[] = "TLS 1.3, server CertificateVerify";
static const char clientcontext[] = "TLS 1.3, client CertificateVerify";
#endif
if (SSL_IS_TLS13(s)) {
size_t hashlen;
/* Set the first 64 bytes of to-be-signed data to octet 32 */
memset(tls13tbs, 32, TLS13_TBS_START_SIZE);
/* This copies the 33 bytes of context plus the 0 separator byte */
if (s->statem.hand_state == TLS_ST_CR_CERT_VRFY
|| s->statem.hand_state == TLS_ST_SW_CERT_VRFY)
strcpy((char *)tls13tbs + TLS13_TBS_START_SIZE, servercontext);
else
strcpy((char *)tls13tbs + TLS13_TBS_START_SIZE, clientcontext);
/*
* If we're currently reading then we need to use the saved handshake
* hash value. We can't use the current handshake hash state because
* that includes the CertVerify itself.
*/
if (s->statem.hand_state == TLS_ST_CR_CERT_VRFY
|| s->statem.hand_state == TLS_ST_SR_CERT_VRFY) {
memcpy(tls13tbs + TLS13_TBS_PREAMBLE_SIZE, s->cert_verify_hash,
s->cert_verify_hash_len);
hashlen = s->cert_verify_hash_len;
} else if (!ssl_handshake_hash(s, tls13tbs + TLS13_TBS_PREAMBLE_SIZE,
EVP_MAX_MD_SIZE, &hashlen)) {
/* SSLfatal() already called */
return 0;
}
*hdata = tls13tbs;
*hdatalen = TLS13_TBS_PREAMBLE_SIZE + hashlen;
} else {
size_t retlen;
long retlen_l;
retlen = retlen_l = BIO_get_mem_data(s->s3->handshake_buffer, hdata);
if (retlen_l <= 0) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_GET_CERT_VERIFY_TBS_DATA,
ERR_R_INTERNAL_ERROR);
return 0;
}
*hdatalen = retlen;
}
return 1;
}
int tls_construct_cert_verify(SSL *s, WPACKET *pkt)
{
EVP_PKEY *pkey = NULL;
const EVP_MD *md = NULL;
EVP_MD_CTX *mctx = NULL;
EVP_PKEY_CTX *pctx = NULL;
size_t hdatalen = 0, siglen = 0;
void *hdata;
unsigned char *sig = NULL;
unsigned char tls13tbs[TLS13_TBS_PREAMBLE_SIZE + EVP_MAX_MD_SIZE];
const SIGALG_LOOKUP *lu = s->s3->tmp.sigalg;
if (lu == NULL || s->s3->tmp.cert == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_VERIFY,
ERR_R_INTERNAL_ERROR);
goto err;
}
pkey = s->s3->tmp.cert->privatekey;
if (pkey == NULL || !tls1_lookup_md(lu, &md)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_VERIFY,
ERR_R_INTERNAL_ERROR);
goto err;
}
mctx = EVP_MD_CTX_new();
if (mctx == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_VERIFY,
ERR_R_MALLOC_FAILURE);
goto err;
}
/* Get the data to be signed */
if (!get_cert_verify_tbs_data(s, tls13tbs, &hdata, &hdatalen)) {
/* SSLfatal() already called */
goto err;
}
if (SSL_USE_SIGALGS(s) && !WPACKET_put_bytes_u16(pkt, lu->sigalg)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_VERIFY,
ERR_R_INTERNAL_ERROR);
goto err;
}
siglen = EVP_PKEY_size(pkey);
sig = OPENSSL_malloc(siglen);
if (sig == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_VERIFY,
ERR_R_MALLOC_FAILURE);
goto err;
}
if (EVP_DigestSignInit(mctx, &pctx, md, NULL, pkey) <= 0) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_VERIFY,
ERR_R_EVP_LIB);
goto err;
}
if (lu->sig == EVP_PKEY_RSA_PSS) {
if (EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) <= 0
|| EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx,
RSA_PSS_SALTLEN_DIGEST) <= 0) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_VERIFY,
ERR_R_EVP_LIB);
goto err;
}
}
if (s->version == SSL3_VERSION) {
if (EVP_DigestSignUpdate(mctx, hdata, hdatalen) <= 0
|| !EVP_MD_CTX_ctrl(mctx, EVP_CTRL_SSL3_MASTER_SECRET,
(int)s->session->master_key_length,
s->session->master_key)
|| EVP_DigestSignFinal(mctx, sig, &siglen) <= 0) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_VERIFY,
ERR_R_EVP_LIB);
goto err;
}
} else if (EVP_DigestSign(mctx, sig, &siglen, hdata, hdatalen) <= 0) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_VERIFY,
ERR_R_EVP_LIB);
goto err;
}
#ifndef OPENSSL_NO_GOST
{
int pktype = lu->sig;
if (pktype == NID_id_GostR3410_2001
|| pktype == NID_id_GostR3410_2012_256
|| pktype == NID_id_GostR3410_2012_512)
BUF_reverse(sig, NULL, siglen);
}
#endif
if (!WPACKET_sub_memcpy_u16(pkt, sig, siglen)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_CERT_VERIFY,
ERR_R_INTERNAL_ERROR);
goto err;
}
/* Digest cached records and discard handshake buffer */
if (!ssl3_digest_cached_records(s, 0)) {
/* SSLfatal() already called */
goto err;
}
OPENSSL_free(sig);
EVP_MD_CTX_free(mctx);
return 1;
err:
OPENSSL_free(sig);
EVP_MD_CTX_free(mctx);
return 0;
}
MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt)
{
EVP_PKEY *pkey = NULL;
const unsigned char *data;
#ifndef OPENSSL_NO_GOST
unsigned char *gost_data = NULL;
#endif
MSG_PROCESS_RETURN ret = MSG_PROCESS_ERROR;
int j;
unsigned int len;
X509 *peer;
const EVP_MD *md = NULL;
size_t hdatalen = 0;
void *hdata;
unsigned char tls13tbs[TLS13_TBS_PREAMBLE_SIZE + EVP_MAX_MD_SIZE];
EVP_MD_CTX *mctx = EVP_MD_CTX_new();
EVP_PKEY_CTX *pctx = NULL;
if (mctx == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY,
ERR_R_MALLOC_FAILURE);
goto err;
}
peer = s->session->peer;
pkey = X509_get0_pubkey(peer);
if (pkey == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY,
ERR_R_INTERNAL_ERROR);
goto err;
}
if (ssl_cert_lookup_by_pkey(pkey, NULL) == NULL) {
SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PROCESS_CERT_VERIFY,
SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
goto err;
}
if (SSL_USE_SIGALGS(s)) {
unsigned int sigalg;
if (!PACKET_get_net_2(pkt, &sigalg)) {
SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY,
SSL_R_BAD_PACKET);
goto err;
}
if (tls12_check_peer_sigalg(s, sigalg, pkey) <= 0) {
/* SSLfatal() already called */
goto err;
}
} else if (!tls1_set_peer_legacy_sigalg(s, pkey)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY,
ERR_R_INTERNAL_ERROR);
goto err;
}
if (!tls1_lookup_md(s->s3->tmp.peer_sigalg, &md)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY,
ERR_R_INTERNAL_ERROR);
goto err;
}
#ifdef SSL_DEBUG
if (SSL_USE_SIGALGS(s))
fprintf(stderr, "USING TLSv1.2 HASH %s\n",
md == NULL ? "n/a" : EVP_MD_name(md));
#endif
/* Check for broken implementations of GOST ciphersuites */
/*
* If key is GOST and len is exactly 64 or 128, it is signature without
* length field (CryptoPro implementations at least till TLS 1.2)
*/
#ifndef OPENSSL_NO_GOST
if (!SSL_USE_SIGALGS(s)
&& ((PACKET_remaining(pkt) == 64
&& (EVP_PKEY_id(pkey) == NID_id_GostR3410_2001
|| EVP_PKEY_id(pkey) == NID_id_GostR3410_2012_256))
|| (PACKET_remaining(pkt) == 128
&& EVP_PKEY_id(pkey) == NID_id_GostR3410_2012_512))) {
len = PACKET_remaining(pkt);
} else
#endif
if (!PACKET_get_net_2(pkt, &len)) {
SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY,
SSL_R_LENGTH_MISMATCH);
goto err;
}
j = EVP_PKEY_size(pkey);
if (((int)len > j) || ((int)PACKET_remaining(pkt) > j)
|| (PACKET_remaining(pkt) == 0)) {
SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY,
SSL_R_WRONG_SIGNATURE_SIZE);
goto err;
}
if (!PACKET_get_bytes(pkt, &data, len)) {
SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY,
SSL_R_LENGTH_MISMATCH);
goto err;
}
if (!get_cert_verify_tbs_data(s, tls13tbs, &hdata, &hdatalen)) {
/* SSLfatal() already called */
goto err;
}
#ifdef SSL_DEBUG
fprintf(stderr, "Using client verify alg %s\n",
md == NULL ? "n/a" : EVP_MD_name(md));
#endif
if (EVP_DigestVerifyInit(mctx, &pctx, md, NULL, pkey) <= 0) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY,
ERR_R_EVP_LIB);
goto err;
}
#ifndef OPENSSL_NO_GOST
{
int pktype = EVP_PKEY_id(pkey);
if (pktype == NID_id_GostR3410_2001
|| pktype == NID_id_GostR3410_2012_256
|| pktype == NID_id_GostR3410_2012_512) {
if ((gost_data = OPENSSL_malloc(len)) == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR,
SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE);
goto err;
}
BUF_reverse(gost_data, data, len);
data = gost_data;
}
}
#endif
if (SSL_USE_PSS(s)) {
if (EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) <= 0
|| EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx,
RSA_PSS_SALTLEN_DIGEST) <= 0) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY,
ERR_R_EVP_LIB);
goto err;
}
}
if (s->version == SSL3_VERSION) {
if (EVP_DigestVerifyUpdate(mctx, hdata, hdatalen) <= 0
|| !EVP_MD_CTX_ctrl(mctx, EVP_CTRL_SSL3_MASTER_SECRET,
(int)s->session->master_key_length,
s->session->master_key)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY,
ERR_R_EVP_LIB);
goto err;
}
if (EVP_DigestVerifyFinal(mctx, data, len) <= 0) {
SSLfatal(s, SSL_AD_DECRYPT_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY,
SSL_R_BAD_SIGNATURE);
goto err;
}
} else {
j = EVP_DigestVerify(mctx, data, len, hdata, hdatalen);
if (j <= 0) {
SSLfatal(s, SSL_AD_DECRYPT_ERROR, SSL_F_TLS_PROCESS_CERT_VERIFY,
SSL_R_BAD_SIGNATURE);
goto err;
}
}
/*
* In TLSv1.3 on the client side we make sure we prepare the client
* certificate after the CertVerify instead of when we get the
* CertificateRequest. This is because in TLSv1.3 the CertificateRequest
* comes *before* the Certificate message. In TLSv1.2 it comes after. We
* want to make sure that SSL_get_peer_certificate() will return the actual
* server certificate from the client_cert_cb callback.
*/
if (!s->server && SSL_IS_TLS13(s) && s->s3->tmp.cert_req == 1)
ret = MSG_PROCESS_CONTINUE_PROCESSING;
else
ret = MSG_PROCESS_CONTINUE_READING;
err:
BIO_free(s->s3->handshake_buffer);
s->s3->handshake_buffer = NULL;
EVP_MD_CTX_free(mctx);
#ifndef OPENSSL_NO_GOST
OPENSSL_free(gost_data);
#endif
return ret;
}
int tls_construct_finished(SSL *s, WPACKET *pkt)
{
size_t finish_md_len;
const char *sender;
size_t slen;
/* This is a real handshake so make sure we clean it up at the end */
if (!s->server && s->post_handshake_auth != SSL_PHA_REQUESTED)
s->statem.cleanuphand = 1;
/*
* We only change the keys if we didn't already do this when we sent the
* client certificate
*/
if (SSL_IS_TLS13(s)
&& !s->server
&& s->s3->tmp.cert_req == 0
&& (!s->method->ssl3_enc->change_cipher_state(s,
SSL3_CC_HANDSHAKE | SSL3_CHANGE_CIPHER_CLIENT_WRITE))) {;
/* SSLfatal() already called */
return 0;
}
if (s->server) {
sender = s->method->ssl3_enc->server_finished_label;
slen = s->method->ssl3_enc->server_finished_label_len;
} else {
sender = s->method->ssl3_enc->client_finished_label;
slen = s->method->ssl3_enc->client_finished_label_len;
}
finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
sender, slen,
s->s3->tmp.finish_md);
if (finish_md_len == 0) {
/* SSLfatal() already called */
return 0;
}
s->s3->tmp.finish_md_len = finish_md_len;
if (!WPACKET_memcpy(pkt, s->s3->tmp.finish_md, finish_md_len)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_FINISHED,
ERR_R_INTERNAL_ERROR);
return 0;
}
/*
* Log the master secret, if logging is enabled. We don't log it for
* TLSv1.3: there's a different key schedule for that.
*/
if (!SSL_IS_TLS13(s) && !ssl_log_secret(s, MASTER_SECRET_LABEL,
s->session->master_key,
s->session->master_key_length)) {
/* SSLfatal() already called */
return 0;
}
/*
* Copy the finished so we can use it for renegotiation checks
*/
if (!ossl_assert(finish_md_len <= EVP_MAX_MD_SIZE)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_FINISHED,
ERR_R_INTERNAL_ERROR);
return 0;
}
if (!s->server) {
memcpy(s->s3->previous_client_finished, s->s3->tmp.finish_md,
finish_md_len);
s->s3->previous_client_finished_len = finish_md_len;
} else {
memcpy(s->s3->previous_server_finished, s->s3->tmp.finish_md,
finish_md_len);
s->s3->previous_server_finished_len = finish_md_len;
}
return 1;
}
int tls_construct_key_update(SSL *s, WPACKET *pkt)
{
if (!WPACKET_put_bytes_u8(pkt, s->key_update)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_CONSTRUCT_KEY_UPDATE,
ERR_R_INTERNAL_ERROR);
return 0;
}
s->key_update = SSL_KEY_UPDATE_NONE;
return 1;
}
MSG_PROCESS_RETURN tls_process_key_update(SSL *s, PACKET *pkt)
{
unsigned int updatetype;
/*
* A KeyUpdate message signals a key change so the end of the message must
* be on a record boundary.
*/
if (RECORD_LAYER_processed_read_pending(&s->rlayer)) {
SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_TLS_PROCESS_KEY_UPDATE,
SSL_R_NOT_ON_RECORD_BOUNDARY);
return MSG_PROCESS_ERROR;
}
if (!PACKET_get_1(pkt, &updatetype)
|| PACKET_remaining(pkt) != 0) {
SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_KEY_UPDATE,
SSL_R_BAD_KEY_UPDATE);
return MSG_PROCESS_ERROR;
}
/*
* There are only two defined key update types. Fail if we get a value we
* didn't recognise.
*/
if (updatetype != SSL_KEY_UPDATE_NOT_REQUESTED
&& updatetype != SSL_KEY_UPDATE_REQUESTED) {
SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PROCESS_KEY_UPDATE,
SSL_R_BAD_KEY_UPDATE);
return MSG_PROCESS_ERROR;
}
/*
* If we get a request for us to update our sending keys too then, we need
* to additionally send a KeyUpdate message. However that message should
* not also request an update (otherwise we get into an infinite loop).
*/
if (updatetype == SSL_KEY_UPDATE_REQUESTED)
s->key_update = SSL_KEY_UPDATE_NOT_REQUESTED;
if (!tls13_update_key(s, 0)) {
/* SSLfatal() already called */
return MSG_PROCESS_ERROR;
}
return MSG_PROCESS_FINISHED_READING;
}
/*
* ssl3_take_mac calculates the Finished MAC for the handshakes messages seen
* to far.
*/
int ssl3_take_mac(SSL *s)
{
const char *sender;
size_t slen;
if (!s->server) {
sender = s->method->ssl3_enc->server_finished_label;
slen = s->method->ssl3_enc->server_finished_label_len;
} else {
sender = s->method->ssl3_enc->client_finished_label;
slen = s->method->ssl3_enc->client_finished_label_len;
}
s->s3->tmp.peer_finish_md_len =
s->method->ssl3_enc->final_finish_mac(s, sender, slen,
s->s3->tmp.peer_finish_md);
if (s->s3->tmp.peer_finish_md_len == 0) {
/* SSLfatal() already called */
return 0;
}
return 1;
}
MSG_PROCESS_RETURN tls_process_change_cipher_spec(SSL *s, PACKET *pkt)
{
size_t remain;
remain = PACKET_remaining(pkt);
/*
* 'Change Cipher Spec' is just a single byte, which should already have
* been consumed by ssl_get_message() so there should be no bytes left,
* unless we're using DTLS1_BAD_VER, which has an extra 2 bytes
*/
if (SSL_IS_DTLS(s)) {
if ((s->version == DTLS1_BAD_VER
&& remain != DTLS1_CCS_HEADER_LENGTH + 1)
|| (s->version != DTLS1_BAD_VER
&& remain != DTLS1_CCS_HEADER_LENGTH - 1)) {
SSLfatal(s, SSL_AD_DECODE_ERROR,
SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC,
SSL_R_BAD_CHANGE_CIPHER_SPEC);
return MSG_PROCESS_ERROR;
}
} else {
if (remain != 0) {
SSLfatal(s, SSL_AD_DECODE_ERROR,
SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC,
SSL_R_BAD_CHANGE_CIPHER_SPEC);
return MSG_PROCESS_ERROR;
}
}
/* Check we have a cipher to change to */
if (s->s3->tmp.new_cipher == NULL) {
SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE,
SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC, SSL_R_CCS_RECEIVED_EARLY);
return MSG_PROCESS_ERROR;
}
s->s3->change_cipher_spec = 1;
if (!ssl3_do_change_cipher_spec(s)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_CHANGE_CIPHER_SPEC,
ERR_R_INTERNAL_ERROR);
return MSG_PROCESS_ERROR;
}
if (SSL_IS_DTLS(s)) {
dtls1_reset_seq_numbers(s, SSL3_CC_READ);
if (s->version == DTLS1_BAD_VER)
s->d1->handshake_read_seq++;
#ifndef OPENSSL_NO_SCTP
/*
* Remember that a CCS has been received, so that an old key of
* SCTP-Auth can be deleted when a CCS is sent. Will be ignored if no
* SCTP is used
*/
BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD, 1, NULL);
#endif
}
return MSG_PROCESS_CONTINUE_READING;
}
MSG_PROCESS_RETURN tls_process_finished(SSL *s, PACKET *pkt)
{
size_t md_len;
/* This is a real handshake so make sure we clean it up at the end */
if (s->server) {
/*
* To get this far we must have read encrypted data from the client. We
* no longer tolerate unencrypted alerts. This value is ignored if less
* than TLSv1.3
*/
s->statem.enc_read_state = ENC_READ_STATE_VALID;
if (s->post_handshake_auth != SSL_PHA_REQUESTED)
s->statem.cleanuphand = 1;
if (SSL_IS_TLS13(s) && !tls13_save_handshake_digest_for_pha(s)) {
/* SSLfatal() already called */
return MSG_PROCESS_ERROR;
}
}
/*
* In TLSv1.3 a Finished message signals a key change so the end of the
* message must be on a record boundary.
*/
if (SSL_IS_TLS13(s) && RECORD_LAYER_processed_read_pending(&s->rlayer)) {
SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_TLS_PROCESS_FINISHED,
SSL_R_NOT_ON_RECORD_BOUNDARY);
return MSG_PROCESS_ERROR;
}
/* If this occurs, we have missed a message */
if (!SSL_IS_TLS13(s) && !s->s3->change_cipher_spec) {
SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_F_TLS_PROCESS_FINISHED,
SSL_R_GOT_A_FIN_BEFORE_A_CCS);
return MSG_PROCESS_ERROR;
}
s->s3->change_cipher_spec = 0;
md_len = s->s3->tmp.peer_finish_md_len;
if (md_len != PACKET_remaining(pkt)) {
SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_TLS_PROCESS_FINISHED,
SSL_R_BAD_DIGEST_LENGTH);
return MSG_PROCESS_ERROR;
}
if (CRYPTO_memcmp(PACKET_data(pkt), s->s3->tmp.peer_finish_md,
md_len) != 0) {
SSLfatal(s, SSL_AD_DECRYPT_ERROR, SSL_F_TLS_PROCESS_FINISHED,
SSL_R_DIGEST_CHECK_FAILED);
return MSG_PROCESS_ERROR;
}
/*
* Copy the finished so we can use it for renegotiation checks
*/
if (!ossl_assert(md_len <= EVP_MAX_MD_SIZE)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS_PROCESS_FINISHED,
ERR_R_INTERNAL_ERROR);
return MSG_PROCESS_ERROR;
}
if (s->server) {
memcpy(s->s3->previous_client_finished, s->s3->tmp.peer_finish_md,
md_len);
s->s3->previous_client_finished_len = md_len;
} else {
memcpy(s->s3->previous_server_finished, s->s3->tmp.peer_finish_md,
md_len);
s->s3->previous_server_finished_len = md_len;
}
/*
* In TLS1.3 we also have to change cipher state and do any final processing
* of the initial server flight (if we are a client)
*/
if (SSL_IS_TLS13(s)) {
if (s->server) {
if (s->post_handshake_auth != SSL_PHA_REQUESTED &&
!s->method->ssl3_enc->change_cipher_state(s,
SSL3_CC_APPLICATION | SSL3_CHANGE_CIPHER_SERVER_READ)) {
/* SSLfatal() already called */
return MSG_PROCESS_ERROR;
}
} else {
/* TLS 1.3 gets the secret size from the handshake md */
size_t dummy;
if (!s->method->ssl3_enc->generate_master_secret(s,
s->master_secret, s->handshake_secret, 0,
&dummy)) {
/* SSLfatal() already called */
return MSG_PROCESS_ERROR;
}
if (!s->method->ssl3_enc->change_cipher_state(s,
SSL3_CC_APPLICATION | SSL3_CHANGE_CIPHER_CLIENT_READ)) {
/* SSLfatal() already called */
return MSG_PROCESS_ERROR;
}
if (!tls_process_initial_server_flight(s)) {
/* SSLfatal() already called */
return MSG_PROCESS_ERROR;
}
}
}
return MSG_PROCESS_FINISHED_READING;
}
int tls_construct_change_cipher_spec(SSL *s, WPACKET *pkt)
{
if (!WPACKET_put_bytes_u8(pkt, SSL3_MT_CCS)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR,
SSL_F_TLS_CONSTRUCT_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR);
return 0;
}
return 1;
}
/* Add a certificate to the WPACKET */
static int ssl_add_cert_to_wpacket(SSL *s, WPACKET *pkt, X509 *x, int chain)
{
int len;
unsigned char *outbytes;
len = i2d_X509(x, NULL);
if (len < 0) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL_ADD_CERT_TO_WPACKET,
ERR_R_BUF_LIB);
return 0;
}
if (!WPACKET_sub_allocate_bytes_u24(pkt, len, &outbytes)
|| i2d_X509(x, &outbytes) != len) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL_ADD_CERT_TO_WPACKET,
ERR_R_INTERNAL_ERROR);
return 0;
}
if (SSL_IS_TLS13(s)
&& !tls_construct_extensions(s, pkt, SSL_EXT_TLS1_3_CERTIFICATE, x,
chain)) {
/* SSLfatal() already called */
return 0;
}
return 1;
}
/* Add certificate chain to provided WPACKET */
static int ssl_add_cert_chain(SSL *s, WPACKET *pkt, CERT_PKEY *cpk)
{
int i, chain_count;
X509 *x;
STACK_OF(X509) *extra_certs;
STACK_OF(X509) *chain = NULL;
X509_STORE *chain_store;
if (cpk == NULL || cpk->x509 == NULL)
return 1;
x = cpk->x509;
/*
* If we have a certificate specific chain use it, else use parent ctx.
*/
if (cpk->chain != NULL)
extra_certs = cpk->chain;
else
extra_certs = s->ctx->extra_certs;
if ((s->mode & SSL_MODE_NO_AUTO_CHAIN) || extra_certs)
chain_store = NULL;
else if (s->cert->chain_store)
chain_store = s->cert->chain_store;
else
chain_store = s->ctx->cert_store;
if (chain_store != NULL) {
X509_STORE_CTX *xs_ctx = X509_STORE_CTX_new();
if (xs_ctx == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL_ADD_CERT_CHAIN,
ERR_R_MALLOC_FAILURE);
return 0;
}
if (!X509_STORE_CTX_init(xs_ctx, chain_store, x, NULL)) {
X509_STORE_CTX_free(xs_ctx);
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL_ADD_CERT_CHAIN,
ERR_R_X509_LIB);
return 0;
}
/*
* It is valid for the chain not to be complete (because normally we
* don't include the root cert in the chain). Therefore we deliberately
* ignore the error return from this call. We're not actually verifying
* the cert - we're just building as much of the chain as we can
*/
(void)X509_verify_cert(xs_ctx);
/* Don't leave errors in the queue */
ERR_clear_error();
chain = X509_STORE_CTX_get0_chain(xs_ctx);
i = ssl_security_cert_chain(s, chain, NULL, 0);
if (i != 1) {
#if 0
/* Dummy error calls so mkerr generates them */
SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, SSL_R_EE_KEY_TOO_SMALL);
SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, SSL_R_CA_KEY_TOO_SMALL);
SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, SSL_R_CA_MD_TOO_WEAK);
#endif
X509_STORE_CTX_free(xs_ctx);
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL_ADD_CERT_CHAIN, i);
return 0;
}
chain_count = sk_X509_num(chain);
for (i = 0; i < chain_count; i++) {
x = sk_X509_value(chain, i);
if (!ssl_add_cert_to_wpacket(s, pkt, x, i)) {
/* SSLfatal() already called */