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freebsd-dev/crypto/openssl/ssl/t1_enc.c
John Baldwin 62ca9fc1ad OpenSSL: Only enable KTLS if it is explicitly configured 
It has always been the case that KTLS is not compiled by default. However
if it is compiled then it was automatically used unless specifically
configured not to. This is problematic because it avoids any crypto
implementations from providers. A user who configures all crypto to use
the FIPS provider may unexpectedly find that TLS related crypto is actually
being performed outside of the FIPS boundary.

Instead we change KTLS so that it is disabled by default.

We also swap to using a single "option" (i.e. SSL_OP_ENABLE_KTLS) rather
than two separate "modes", (i.e. SSL_MODE_NO_KTLS_RX and
SSL_MODE_NO_KTLS_TX).

Reviewed by:	jkim
Obtained from:	OpenSSL (a3a54179b6754fbed6d88e434baac710a83aaf80)
MFC after:	5 days
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D31440
2021-08-17 14:41:24 -07:00

803 lines
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/*
* Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.
* Copyright 2005 Nokia. 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 <stdio.h>
#include "ssl_local.h"
#include "record/record_local.h"
#include "internal/ktls.h"
#include "internal/cryptlib.h"
#include <openssl/comp.h>
#include <openssl/evp.h>
#include <openssl/kdf.h>
#include <openssl/rand.h>
#include <openssl/obj_mac.h>
/* seed1 through seed5 are concatenated */
static int tls1_PRF(SSL *s,
const void *seed1, size_t seed1_len,
const void *seed2, size_t seed2_len,
const void *seed3, size_t seed3_len,
const void *seed4, size_t seed4_len,
const void *seed5, size_t seed5_len,
const unsigned char *sec, size_t slen,
unsigned char *out, size_t olen, int fatal)
{
const EVP_MD *md = ssl_prf_md(s);
EVP_PKEY_CTX *pctx = NULL;
int ret = 0;
if (md == NULL) {
/* Should never happen */
if (fatal)
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_PRF,
ERR_R_INTERNAL_ERROR);
else
SSLerr(SSL_F_TLS1_PRF, ERR_R_INTERNAL_ERROR);
return 0;
}
pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_TLS1_PRF, NULL);
if (pctx == NULL || EVP_PKEY_derive_init(pctx) <= 0
|| EVP_PKEY_CTX_set_tls1_prf_md(pctx, md) <= 0
|| EVP_PKEY_CTX_set1_tls1_prf_secret(pctx, sec, (int)slen) <= 0
|| EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed1, (int)seed1_len) <= 0
|| EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed2, (int)seed2_len) <= 0
|| EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed3, (int)seed3_len) <= 0
|| EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed4, (int)seed4_len) <= 0
|| EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed5, (int)seed5_len) <= 0
|| EVP_PKEY_derive(pctx, out, &olen) <= 0) {
if (fatal)
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_PRF,
ERR_R_INTERNAL_ERROR);
else
SSLerr(SSL_F_TLS1_PRF, ERR_R_INTERNAL_ERROR);
goto err;
}
ret = 1;
err:
EVP_PKEY_CTX_free(pctx);
return ret;
}
static int tls1_generate_key_block(SSL *s, unsigned char *km, size_t num)
{
int ret;
/* Calls SSLfatal() as required */
ret = tls1_PRF(s,
TLS_MD_KEY_EXPANSION_CONST,
TLS_MD_KEY_EXPANSION_CONST_SIZE, s->s3->server_random,
SSL3_RANDOM_SIZE, s->s3->client_random, SSL3_RANDOM_SIZE,
NULL, 0, NULL, 0, s->session->master_key,
s->session->master_key_length, km, num, 1);
return ret;
}
#ifndef OPENSSL_NO_KTLS
/*
* Count the number of records that were not processed yet from record boundary.
*
* This function assumes that there are only fully formed records read in the
* record layer. If read_ahead is enabled, then this might be false and this
* function will fail.
*/
# ifndef OPENSSL_NO_KTLS_RX
static int count_unprocessed_records(SSL *s)
{
SSL3_BUFFER *rbuf = RECORD_LAYER_get_rbuf(&s->rlayer);
PACKET pkt, subpkt;
int count = 0;
if (!PACKET_buf_init(&pkt, rbuf->buf + rbuf->offset, rbuf->left))
return -1;
while (PACKET_remaining(&pkt) > 0) {
/* Skip record type and version */
if (!PACKET_forward(&pkt, 3))
return -1;
/* Read until next record */
if (PACKET_get_length_prefixed_2(&pkt, &subpkt))
return -1;
count += 1;
}
return count;
}
# endif
#endif
int tls1_change_cipher_state(SSL *s, int which)
{
unsigned char *p, *mac_secret;
unsigned char *ms, *key, *iv;
EVP_CIPHER_CTX *dd;
const EVP_CIPHER *c;
#ifndef OPENSSL_NO_COMP
const SSL_COMP *comp;
#endif
const EVP_MD *m;
int mac_type;
size_t *mac_secret_size;
EVP_MD_CTX *mac_ctx;
EVP_PKEY *mac_key;
size_t n, i, j, k, cl;
int reuse_dd = 0;
#ifndef OPENSSL_NO_KTLS
ktls_crypto_info_t crypto_info;
unsigned char *rec_seq;
void *rl_sequence;
# ifndef OPENSSL_NO_KTLS_RX
int count_unprocessed;
int bit;
# endif
BIO *bio;
#endif
c = s->s3->tmp.new_sym_enc;
m = s->s3->tmp.new_hash;
mac_type = s->s3->tmp.new_mac_pkey_type;
#ifndef OPENSSL_NO_COMP
comp = s->s3->tmp.new_compression;
#endif
if (which & SSL3_CC_READ) {
if (s->ext.use_etm)
s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
else
s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
s->mac_flags |= SSL_MAC_FLAG_READ_MAC_STREAM;
else
s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_STREAM;
if (s->enc_read_ctx != NULL) {
reuse_dd = 1;
} else if ((s->enc_read_ctx = EVP_CIPHER_CTX_new()) == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
ERR_R_MALLOC_FAILURE);
goto err;
} else {
/*
* make sure it's initialised in case we exit later with an error
*/
EVP_CIPHER_CTX_reset(s->enc_read_ctx);
}
dd = s->enc_read_ctx;
mac_ctx = ssl_replace_hash(&s->read_hash, NULL);
if (mac_ctx == NULL)
goto err;
#ifndef OPENSSL_NO_COMP
COMP_CTX_free(s->expand);
s->expand = NULL;
if (comp != NULL) {
s->expand = COMP_CTX_new(comp->method);
if (s->expand == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR,
SSL_F_TLS1_CHANGE_CIPHER_STATE,
SSL_R_COMPRESSION_LIBRARY_ERROR);
goto err;
}
}
#endif
/*
* this is done by dtls1_reset_seq_numbers for DTLS
*/
if (!SSL_IS_DTLS(s))
RECORD_LAYER_reset_read_sequence(&s->rlayer);
mac_secret = &(s->s3->read_mac_secret[0]);
mac_secret_size = &(s->s3->read_mac_secret_size);
} else {
s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
if (s->ext.use_etm)
s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
else
s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM;
else
s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM;
if (s->enc_write_ctx != NULL && !SSL_IS_DTLS(s)) {
reuse_dd = 1;
} else if ((s->enc_write_ctx = EVP_CIPHER_CTX_new()) == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
ERR_R_MALLOC_FAILURE);
goto err;
}
dd = s->enc_write_ctx;
if (SSL_IS_DTLS(s)) {
mac_ctx = EVP_MD_CTX_new();
if (mac_ctx == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR,
SSL_F_TLS1_CHANGE_CIPHER_STATE,
ERR_R_MALLOC_FAILURE);
goto err;
}
s->write_hash = mac_ctx;
} else {
mac_ctx = ssl_replace_hash(&s->write_hash, NULL);
if (mac_ctx == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR,
SSL_F_TLS1_CHANGE_CIPHER_STATE,
ERR_R_MALLOC_FAILURE);
goto err;
}
}
#ifndef OPENSSL_NO_COMP
COMP_CTX_free(s->compress);
s->compress = NULL;
if (comp != NULL) {
s->compress = COMP_CTX_new(comp->method);
if (s->compress == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR,
SSL_F_TLS1_CHANGE_CIPHER_STATE,
SSL_R_COMPRESSION_LIBRARY_ERROR);
goto err;
}
}
#endif
/*
* this is done by dtls1_reset_seq_numbers for DTLS
*/
if (!SSL_IS_DTLS(s))
RECORD_LAYER_reset_write_sequence(&s->rlayer);
mac_secret = &(s->s3->write_mac_secret[0]);
mac_secret_size = &(s->s3->write_mac_secret_size);
}
if (reuse_dd)
EVP_CIPHER_CTX_reset(dd);
p = s->s3->tmp.key_block;
i = *mac_secret_size = s->s3->tmp.new_mac_secret_size;
/* TODO(size_t): convert me */
cl = EVP_CIPHER_key_length(c);
j = cl;
/* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
/* If GCM/CCM mode only part of IV comes from PRF */
if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE)
k = EVP_GCM_TLS_FIXED_IV_LEN;
else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE)
k = EVP_CCM_TLS_FIXED_IV_LEN;
else
k = EVP_CIPHER_iv_length(c);
if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
(which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
ms = &(p[0]);
n = i + i;
key = &(p[n]);
n += j + j;
iv = &(p[n]);
n += k + k;
} else {
n = i;
ms = &(p[n]);
n += i + j;
key = &(p[n]);
n += j + k;
iv = &(p[n]);
n += k;
}
if (n > s->s3->tmp.key_block_length) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
ERR_R_INTERNAL_ERROR);
goto err;
}
memcpy(mac_secret, ms, i);
if (!(EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
/* TODO(size_t): Convert this function */
mac_key = EVP_PKEY_new_mac_key(mac_type, NULL, mac_secret,
(int)*mac_secret_size);
if (mac_key == NULL
|| EVP_DigestSignInit(mac_ctx, NULL, m, NULL, mac_key) <= 0) {
EVP_PKEY_free(mac_key);
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
ERR_R_INTERNAL_ERROR);
goto err;
}
EVP_PKEY_free(mac_key);
}
#ifdef SSL_DEBUG
printf("which = %04X\nmac key=", which);
{
size_t z;
for (z = 0; z < i; z++)
printf("%02X%c", ms[z], ((z + 1) % 16) ? ' ' : '\n');
}
#endif
if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE) {
if (!EVP_CipherInit_ex(dd, c, NULL, key, NULL, (which & SSL3_CC_WRITE))
|| !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GCM_SET_IV_FIXED, (int)k,
iv)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
ERR_R_INTERNAL_ERROR);
goto err;
}
} else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE) {
int taglen;
if (s->s3->tmp.
new_cipher->algorithm_enc & (SSL_AES128CCM8 | SSL_AES256CCM8))
taglen = EVP_CCM8_TLS_TAG_LEN;
else
taglen = EVP_CCM_TLS_TAG_LEN;
if (!EVP_CipherInit_ex(dd, c, NULL, NULL, NULL, (which & SSL3_CC_WRITE))
|| !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_IVLEN, 12, NULL)
|| !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_TAG, taglen, NULL)
|| !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_CCM_SET_IV_FIXED, (int)k, iv)
|| !EVP_CipherInit_ex(dd, NULL, NULL, key, NULL, -1)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
ERR_R_INTERNAL_ERROR);
goto err;
}
} else {
if (!EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE))) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
ERR_R_INTERNAL_ERROR);
goto err;
}
}
/* Needed for "composite" AEADs, such as RC4-HMAC-MD5 */
if ((EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER) && *mac_secret_size
&& !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_MAC_KEY,
(int)*mac_secret_size, mac_secret)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
ERR_R_INTERNAL_ERROR);
goto err;
}
#ifndef OPENSSL_NO_KTLS
if (s->compress || (s->options & SSL_OP_ENABLE_KTLS) == 0)
goto skip_ktls;
/* ktls supports only the maximum fragment size */
if (ssl_get_max_send_fragment(s) != SSL3_RT_MAX_PLAIN_LENGTH)
goto skip_ktls;
/* check that cipher is supported */
if (!ktls_check_supported_cipher(s, c, dd))
goto skip_ktls;
if (which & SSL3_CC_WRITE)
bio = s->wbio;
else
bio = s->rbio;
if (!ossl_assert(bio != NULL)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
ERR_R_INTERNAL_ERROR);
goto err;
}
/* All future data will get encrypted by ktls. Flush the BIO or skip ktls */
if (which & SSL3_CC_WRITE) {
if (BIO_flush(bio) <= 0)
goto skip_ktls;
}
/* ktls doesn't support renegotiation */
if ((BIO_get_ktls_send(s->wbio) && (which & SSL3_CC_WRITE)) ||
(BIO_get_ktls_recv(s->rbio) && (which & SSL3_CC_READ))) {
SSLfatal(s, SSL_AD_NO_RENEGOTIATION, SSL_F_TLS1_CHANGE_CIPHER_STATE,
ERR_R_INTERNAL_ERROR);
goto err;
}
if (which & SSL3_CC_WRITE)
rl_sequence = RECORD_LAYER_get_write_sequence(&s->rlayer);
else
rl_sequence = RECORD_LAYER_get_read_sequence(&s->rlayer);
if (!ktls_configure_crypto(s, c, dd, rl_sequence, &crypto_info, &rec_seq,
iv, key, ms, *mac_secret_size))
goto skip_ktls;
if (which & SSL3_CC_READ) {
# ifndef OPENSSL_NO_KTLS_RX
count_unprocessed = count_unprocessed_records(s);
if (count_unprocessed < 0)
goto skip_ktls;
/* increment the crypto_info record sequence */
while (count_unprocessed) {
for (bit = 7; bit >= 0; bit--) { /* increment */
++rec_seq[bit];
if (rec_seq[bit] != 0)
break;
}
count_unprocessed--;
}
# else
goto skip_ktls;
# endif
}
/* ktls works with user provided buffers directly */
if (BIO_set_ktls(bio, &crypto_info, which & SSL3_CC_WRITE)) {
if (which & SSL3_CC_WRITE)
ssl3_release_write_buffer(s);
SSL_set_options(s, SSL_OP_NO_RENEGOTIATION);
}
skip_ktls:
#endif /* OPENSSL_NO_KTLS */
s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
#ifdef SSL_DEBUG
printf("which = %04X\nkey=", which);
{
int z;
for (z = 0; z < EVP_CIPHER_key_length(c); z++)
printf("%02X%c", key[z], ((z + 1) % 16) ? ' ' : '\n');
}
printf("\niv=");
{
size_t z;
for (z = 0; z < k; z++)
printf("%02X%c", iv[z], ((z + 1) % 16) ? ' ' : '\n');
}
printf("\n");
#endif
return 1;
err:
return 0;
}
int tls1_setup_key_block(SSL *s)
{
unsigned char *p;
const EVP_CIPHER *c;
const EVP_MD *hash;
SSL_COMP *comp;
int mac_type = NID_undef;
size_t num, mac_secret_size = 0;
int ret = 0;
if (s->s3->tmp.key_block_length != 0)
return 1;
if (!ssl_cipher_get_evp(s->session, &c, &hash, &mac_type, &mac_secret_size,
&comp, s->ext.use_etm)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_SETUP_KEY_BLOCK,
SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
return 0;
}
s->s3->tmp.new_sym_enc = c;
s->s3->tmp.new_hash = hash;
s->s3->tmp.new_mac_pkey_type = mac_type;
s->s3->tmp.new_mac_secret_size = mac_secret_size;
num = EVP_CIPHER_key_length(c) + mac_secret_size + EVP_CIPHER_iv_length(c);
num *= 2;
ssl3_cleanup_key_block(s);
if ((p = OPENSSL_malloc(num)) == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_SETUP_KEY_BLOCK,
ERR_R_MALLOC_FAILURE);
goto err;
}
s->s3->tmp.key_block_length = num;
s->s3->tmp.key_block = p;
#ifdef SSL_DEBUG
printf("client random\n");
{
int z;
for (z = 0; z < SSL3_RANDOM_SIZE; z++)
printf("%02X%c", s->s3->client_random[z],
((z + 1) % 16) ? ' ' : '\n');
}
printf("server random\n");
{
int z;
for (z = 0; z < SSL3_RANDOM_SIZE; z++)
printf("%02X%c", s->s3->server_random[z],
((z + 1) % 16) ? ' ' : '\n');
}
printf("master key\n");
{
size_t z;
for (z = 0; z < s->session->master_key_length; z++)
printf("%02X%c", s->session->master_key[z],
((z + 1) % 16) ? ' ' : '\n');
}
#endif
if (!tls1_generate_key_block(s, p, num)) {
/* SSLfatal() already called */
goto err;
}
#ifdef SSL_DEBUG
printf("\nkey block\n");
{
size_t z;
for (z = 0; z < num; z++)
printf("%02X%c", p[z], ((z + 1) % 16) ? ' ' : '\n');
}
#endif
if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)
&& s->method->version <= TLS1_VERSION) {
/*
* enable vulnerability countermeasure for CBC ciphers with known-IV
* problem (http://www.openssl.org/~bodo/tls-cbc.txt)
*/
s->s3->need_empty_fragments = 1;
if (s->session->cipher != NULL) {
if (s->session->cipher->algorithm_enc == SSL_eNULL)
s->s3->need_empty_fragments = 0;
#ifndef OPENSSL_NO_RC4
if (s->session->cipher->algorithm_enc == SSL_RC4)
s->s3->need_empty_fragments = 0;
#endif
}
}
ret = 1;
err:
return ret;
}
size_t tls1_final_finish_mac(SSL *s, const char *str, size_t slen,
unsigned char *out)
{
size_t hashlen;
unsigned char hash[EVP_MAX_MD_SIZE];
if (!ssl3_digest_cached_records(s, 0)) {
/* SSLfatal() already called */
return 0;
}
if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
/* SSLfatal() already called */
return 0;
}
if (!tls1_PRF(s, str, slen, hash, hashlen, NULL, 0, NULL, 0, NULL, 0,
s->session->master_key, s->session->master_key_length,
out, TLS1_FINISH_MAC_LENGTH, 1)) {
/* SSLfatal() already called */
return 0;
}
OPENSSL_cleanse(hash, hashlen);
return TLS1_FINISH_MAC_LENGTH;
}
int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
size_t len, size_t *secret_size)
{
if (s->session->flags & SSL_SESS_FLAG_EXTMS) {
unsigned char hash[EVP_MAX_MD_SIZE * 2];
size_t hashlen;
/*
* Digest cached records keeping record buffer (if present): this won't
* affect client auth because we're freezing the buffer at the same
* point (after client key exchange and before certificate verify)
*/
if (!ssl3_digest_cached_records(s, 1)
|| !ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
/* SSLfatal() already called */
return 0;
}
#ifdef SSL_DEBUG
fprintf(stderr, "Handshake hashes:\n");
BIO_dump_fp(stderr, (char *)hash, hashlen);
#endif
if (!tls1_PRF(s,
TLS_MD_EXTENDED_MASTER_SECRET_CONST,
TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE,
hash, hashlen,
NULL, 0,
NULL, 0,
NULL, 0, p, len, out,
SSL3_MASTER_SECRET_SIZE, 1)) {
/* SSLfatal() already called */
return 0;
}
OPENSSL_cleanse(hash, hashlen);
} else {
if (!tls1_PRF(s,
TLS_MD_MASTER_SECRET_CONST,
TLS_MD_MASTER_SECRET_CONST_SIZE,
s->s3->client_random, SSL3_RANDOM_SIZE,
NULL, 0,
s->s3->server_random, SSL3_RANDOM_SIZE,
NULL, 0, p, len, out,
SSL3_MASTER_SECRET_SIZE, 1)) {
/* SSLfatal() already called */
return 0;
}
}
#ifdef SSL_DEBUG
fprintf(stderr, "Premaster Secret:\n");
BIO_dump_fp(stderr, (char *)p, len);
fprintf(stderr, "Client Random:\n");
BIO_dump_fp(stderr, (char *)s->s3->client_random, SSL3_RANDOM_SIZE);
fprintf(stderr, "Server Random:\n");
BIO_dump_fp(stderr, (char *)s->s3->server_random, SSL3_RANDOM_SIZE);
fprintf(stderr, "Master Secret:\n");
BIO_dump_fp(stderr, (char *)s->session->master_key,
SSL3_MASTER_SECRET_SIZE);
#endif
*secret_size = SSL3_MASTER_SECRET_SIZE;
return 1;
}
int tls1_export_keying_material(SSL *s, unsigned char *out, size_t olen,
const char *label, size_t llen,
const unsigned char *context,
size_t contextlen, int use_context)
{
unsigned char *val = NULL;
size_t vallen = 0, currentvalpos;
int rv;
/*
* construct PRF arguments we construct the PRF argument ourself rather
* than passing separate values into the TLS PRF to ensure that the
* concatenation of values does not create a prohibited label.
*/
vallen = llen + SSL3_RANDOM_SIZE * 2;
if (use_context) {
vallen += 2 + contextlen;
}
val = OPENSSL_malloc(vallen);
if (val == NULL)
goto err2;
currentvalpos = 0;
memcpy(val + currentvalpos, (unsigned char *)label, llen);
currentvalpos += llen;
memcpy(val + currentvalpos, s->s3->client_random, SSL3_RANDOM_SIZE);
currentvalpos += SSL3_RANDOM_SIZE;
memcpy(val + currentvalpos, s->s3->server_random, SSL3_RANDOM_SIZE);
currentvalpos += SSL3_RANDOM_SIZE;
if (use_context) {
val[currentvalpos] = (contextlen >> 8) & 0xff;
currentvalpos++;
val[currentvalpos] = contextlen & 0xff;
currentvalpos++;
if ((contextlen > 0) || (context != NULL)) {
memcpy(val + currentvalpos, context, contextlen);
}
}
/*
* disallow prohibited labels note that SSL3_RANDOM_SIZE > max(prohibited
* label len) = 15, so size of val > max(prohibited label len) = 15 and
* the comparisons won't have buffer overflow
*/
if (memcmp(val, TLS_MD_CLIENT_FINISH_CONST,
TLS_MD_CLIENT_FINISH_CONST_SIZE) == 0)
goto err1;
if (memcmp(val, TLS_MD_SERVER_FINISH_CONST,
TLS_MD_SERVER_FINISH_CONST_SIZE) == 0)
goto err1;
if (memcmp(val, TLS_MD_MASTER_SECRET_CONST,
TLS_MD_MASTER_SECRET_CONST_SIZE) == 0)
goto err1;
if (memcmp(val, TLS_MD_EXTENDED_MASTER_SECRET_CONST,
TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE) == 0)
goto err1;
if (memcmp(val, TLS_MD_KEY_EXPANSION_CONST,
TLS_MD_KEY_EXPANSION_CONST_SIZE) == 0)
goto err1;
rv = tls1_PRF(s,
val, vallen,
NULL, 0,
NULL, 0,
NULL, 0,
NULL, 0,
s->session->master_key, s->session->master_key_length,
out, olen, 0);
goto ret;
err1:
SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
rv = 0;
goto ret;
err2:
SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, ERR_R_MALLOC_FAILURE);
rv = 0;
ret:
OPENSSL_clear_free(val, vallen);
return rv;
}
int tls1_alert_code(int code)
{
switch (code) {
case SSL_AD_CLOSE_NOTIFY:
return SSL3_AD_CLOSE_NOTIFY;
case SSL_AD_UNEXPECTED_MESSAGE:
return SSL3_AD_UNEXPECTED_MESSAGE;
case SSL_AD_BAD_RECORD_MAC:
return SSL3_AD_BAD_RECORD_MAC;
case SSL_AD_DECRYPTION_FAILED:
return TLS1_AD_DECRYPTION_FAILED;
case SSL_AD_RECORD_OVERFLOW:
return TLS1_AD_RECORD_OVERFLOW;
case SSL_AD_DECOMPRESSION_FAILURE:
return SSL3_AD_DECOMPRESSION_FAILURE;
case SSL_AD_HANDSHAKE_FAILURE:
return SSL3_AD_HANDSHAKE_FAILURE;
case SSL_AD_NO_CERTIFICATE:
return -1;
case SSL_AD_BAD_CERTIFICATE:
return SSL3_AD_BAD_CERTIFICATE;
case SSL_AD_UNSUPPORTED_CERTIFICATE:
return SSL3_AD_UNSUPPORTED_CERTIFICATE;
case SSL_AD_CERTIFICATE_REVOKED:
return SSL3_AD_CERTIFICATE_REVOKED;
case SSL_AD_CERTIFICATE_EXPIRED:
return SSL3_AD_CERTIFICATE_EXPIRED;
case SSL_AD_CERTIFICATE_UNKNOWN:
return SSL3_AD_CERTIFICATE_UNKNOWN;
case SSL_AD_ILLEGAL_PARAMETER:
return SSL3_AD_ILLEGAL_PARAMETER;
case SSL_AD_UNKNOWN_CA:
return TLS1_AD_UNKNOWN_CA;
case SSL_AD_ACCESS_DENIED:
return TLS1_AD_ACCESS_DENIED;
case SSL_AD_DECODE_ERROR:
return TLS1_AD_DECODE_ERROR;
case SSL_AD_DECRYPT_ERROR:
return TLS1_AD_DECRYPT_ERROR;
case SSL_AD_EXPORT_RESTRICTION:
return TLS1_AD_EXPORT_RESTRICTION;
case SSL_AD_PROTOCOL_VERSION:
return TLS1_AD_PROTOCOL_VERSION;
case SSL_AD_INSUFFICIENT_SECURITY:
return TLS1_AD_INSUFFICIENT_SECURITY;
case SSL_AD_INTERNAL_ERROR:
return TLS1_AD_INTERNAL_ERROR;
case SSL_AD_USER_CANCELLED:
return TLS1_AD_USER_CANCELLED;
case SSL_AD_NO_RENEGOTIATION:
return TLS1_AD_NO_RENEGOTIATION;
case SSL_AD_UNSUPPORTED_EXTENSION:
return TLS1_AD_UNSUPPORTED_EXTENSION;
case SSL_AD_CERTIFICATE_UNOBTAINABLE:
return TLS1_AD_CERTIFICATE_UNOBTAINABLE;
case SSL_AD_UNRECOGNIZED_NAME:
return TLS1_AD_UNRECOGNIZED_NAME;
case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
return TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
return TLS1_AD_BAD_CERTIFICATE_HASH_VALUE;
case SSL_AD_UNKNOWN_PSK_IDENTITY:
return TLS1_AD_UNKNOWN_PSK_IDENTITY;
case SSL_AD_INAPPROPRIATE_FALLBACK:
return TLS1_AD_INAPPROPRIATE_FALLBACK;
case SSL_AD_NO_APPLICATION_PROTOCOL:
return TLS1_AD_NO_APPLICATION_PROTOCOL;
case SSL_AD_CERTIFICATE_REQUIRED:
return SSL_AD_HANDSHAKE_FAILURE;
default:
return -1;
}
}
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