/
ssl_tls12_client.c
3608 lines (3071 loc) · 128 KB
/
ssl_tls12_client.c
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/*
* TLS client-side functions
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
#include "common.h"
#if defined(MBEDTLS_SSL_CLI_C) && defined(MBEDTLS_SSL_PROTO_TLS1_2)
#include "mbedtls/platform.h"
#include "mbedtls/ssl.h"
#include "ssl_client.h"
#include "ssl_misc.h"
#include "mbedtls/debug.h"
#include "mbedtls/error.h"
#include "mbedtls/constant_time.h"
#if defined(MBEDTLS_USE_PSA_CRYPTO)
#include "psa_util_internal.h"
#include "psa/crypto.h"
#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
/* Define a local translating function to save code size by not using too many
* arguments in each translating place. */
static int local_err_translation(psa_status_t status)
{
return psa_status_to_mbedtls(status, psa_to_ssl_errors,
ARRAY_LENGTH(psa_to_ssl_errors),
psa_generic_status_to_mbedtls);
}
#define PSA_TO_MBEDTLS_ERR(status) local_err_translation(status)
#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#include <string.h>
#include <stdint.h>
#if defined(MBEDTLS_HAVE_TIME)
#include "mbedtls/platform_time.h"
#endif
#if defined(MBEDTLS_SSL_SESSION_TICKETS)
#include "mbedtls/platform_util.h"
#endif
#if defined(MBEDTLS_SSL_RENEGOTIATION)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_write_renegotiation_ext(mbedtls_ssl_context *ssl,
unsigned char *buf,
const unsigned char *end,
size_t *olen)
{
unsigned char *p = buf;
*olen = 0;
/* We're always including a TLS_EMPTY_RENEGOTIATION_INFO_SCSV in the
* initial ClientHello, in which case also adding the renegotiation
* info extension is NOT RECOMMENDED as per RFC 5746 Section 3.4. */
if (ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS) {
return 0;
}
MBEDTLS_SSL_DEBUG_MSG(3,
("client hello, adding renegotiation extension"));
MBEDTLS_SSL_CHK_BUF_PTR(p, end, 5 + ssl->verify_data_len);
/*
* Secure renegotiation
*/
MBEDTLS_PUT_UINT16_BE(MBEDTLS_TLS_EXT_RENEGOTIATION_INFO, p, 0);
p += 2;
*p++ = 0x00;
*p++ = MBEDTLS_BYTE_0(ssl->verify_data_len + 1);
*p++ = MBEDTLS_BYTE_0(ssl->verify_data_len);
memcpy(p, ssl->own_verify_data, ssl->verify_data_len);
*olen = 5 + ssl->verify_data_len;
return 0;
}
#endif /* MBEDTLS_SSL_RENEGOTIATION */
#if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_1_2_ENABLED) || \
defined(MBEDTLS_KEY_EXCHANGE_ECDSA_CERT_REQ_ALLOWED_ENABLED) || \
defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_write_supported_point_formats_ext(mbedtls_ssl_context *ssl,
unsigned char *buf,
const unsigned char *end,
size_t *olen)
{
unsigned char *p = buf;
(void) ssl; /* ssl used for debugging only */
*olen = 0;
MBEDTLS_SSL_DEBUG_MSG(3,
("client hello, adding supported_point_formats extension"));
MBEDTLS_SSL_CHK_BUF_PTR(p, end, 6);
MBEDTLS_PUT_UINT16_BE(MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS, p, 0);
p += 2;
*p++ = 0x00;
*p++ = 2;
*p++ = 1;
*p++ = MBEDTLS_ECP_PF_UNCOMPRESSED;
*olen = 6;
return 0;
}
#endif /* MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_1_2_ENABLED ||
MBEDTLS_KEY_EXCHANGE_ECDSA_CERT_REQ_ALLOWED_ENABLED ||
MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_write_ecjpake_kkpp_ext(mbedtls_ssl_context *ssl,
unsigned char *buf,
const unsigned char *end,
size_t *olen)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
unsigned char *p = buf;
size_t kkpp_len = 0;
*olen = 0;
/* Skip costly extension if we can't use EC J-PAKE anyway */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if (ssl->handshake->psa_pake_ctx_is_ok != 1) {
return 0;
}
#else
if (mbedtls_ecjpake_check(&ssl->handshake->ecjpake_ctx) != 0) {
return 0;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
MBEDTLS_SSL_DEBUG_MSG(3,
("client hello, adding ecjpake_kkpp extension"));
MBEDTLS_SSL_CHK_BUF_PTR(p, end, 4);
MBEDTLS_PUT_UINT16_BE(MBEDTLS_TLS_EXT_ECJPAKE_KKPP, p, 0);
p += 2;
/*
* We may need to send ClientHello multiple times for Hello verification.
* We don't want to compute fresh values every time (both for performance
* and consistency reasons), so cache the extension content.
*/
if (ssl->handshake->ecjpake_cache == NULL ||
ssl->handshake->ecjpake_cache_len == 0) {
MBEDTLS_SSL_DEBUG_MSG(3, ("generating new ecjpake parameters"));
#if defined(MBEDTLS_USE_PSA_CRYPTO)
ret = mbedtls_psa_ecjpake_write_round(&ssl->handshake->psa_pake_ctx,
p + 2, end - p - 2, &kkpp_len,
MBEDTLS_ECJPAKE_ROUND_ONE);
if (ret != 0) {
psa_destroy_key(ssl->handshake->psa_pake_password);
psa_pake_abort(&ssl->handshake->psa_pake_ctx);
MBEDTLS_SSL_DEBUG_RET(1, "psa_pake_output", ret);
return ret;
}
#else
ret = mbedtls_ecjpake_write_round_one(&ssl->handshake->ecjpake_ctx,
p + 2, end - p - 2, &kkpp_len,
ssl->conf->f_rng, ssl->conf->p_rng);
if (ret != 0) {
MBEDTLS_SSL_DEBUG_RET(1,
"mbedtls_ecjpake_write_round_one", ret);
return ret;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
ssl->handshake->ecjpake_cache = mbedtls_calloc(1, kkpp_len);
if (ssl->handshake->ecjpake_cache == NULL) {
MBEDTLS_SSL_DEBUG_MSG(1, ("allocation failed"));
return MBEDTLS_ERR_SSL_ALLOC_FAILED;
}
memcpy(ssl->handshake->ecjpake_cache, p + 2, kkpp_len);
ssl->handshake->ecjpake_cache_len = kkpp_len;
} else {
MBEDTLS_SSL_DEBUG_MSG(3, ("re-using cached ecjpake parameters"));
kkpp_len = ssl->handshake->ecjpake_cache_len;
MBEDTLS_SSL_CHK_BUF_PTR(p + 2, end, kkpp_len);
memcpy(p + 2, ssl->handshake->ecjpake_cache, kkpp_len);
}
MBEDTLS_PUT_UINT16_BE(kkpp_len, p, 0);
p += 2;
*olen = kkpp_len + 4;
return 0;
}
#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_write_cid_ext(mbedtls_ssl_context *ssl,
unsigned char *buf,
const unsigned char *end,
size_t *olen)
{
unsigned char *p = buf;
size_t ext_len;
/*
* struct {
* opaque cid<0..2^8-1>;
* } ConnectionId;
*/
*olen = 0;
if (ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ||
ssl->negotiate_cid == MBEDTLS_SSL_CID_DISABLED) {
return 0;
}
MBEDTLS_SSL_DEBUG_MSG(3, ("client hello, adding CID extension"));
/* ssl->own_cid_len is at most MBEDTLS_SSL_CID_IN_LEN_MAX
* which is at most 255, so the increment cannot overflow. */
MBEDTLS_SSL_CHK_BUF_PTR(p, end, (unsigned) (ssl->own_cid_len + 5));
/* Add extension ID + size */
MBEDTLS_PUT_UINT16_BE(MBEDTLS_TLS_EXT_CID, p, 0);
p += 2;
ext_len = (size_t) ssl->own_cid_len + 1;
MBEDTLS_PUT_UINT16_BE(ext_len, p, 0);
p += 2;
*p++ = (uint8_t) ssl->own_cid_len;
memcpy(p, ssl->own_cid, ssl->own_cid_len);
*olen = ssl->own_cid_len + 5;
return 0;
}
#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_write_max_fragment_length_ext(mbedtls_ssl_context *ssl,
unsigned char *buf,
const unsigned char *end,
size_t *olen)
{
unsigned char *p = buf;
*olen = 0;
if (ssl->conf->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE) {
return 0;
}
MBEDTLS_SSL_DEBUG_MSG(3,
("client hello, adding max_fragment_length extension"));
MBEDTLS_SSL_CHK_BUF_PTR(p, end, 5);
MBEDTLS_PUT_UINT16_BE(MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH, p, 0);
p += 2;
*p++ = 0x00;
*p++ = 1;
*p++ = ssl->conf->mfl_code;
*olen = 5;
return 0;
}
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_write_encrypt_then_mac_ext(mbedtls_ssl_context *ssl,
unsigned char *buf,
const unsigned char *end,
size_t *olen)
{
unsigned char *p = buf;
*olen = 0;
if (ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED) {
return 0;
}
MBEDTLS_SSL_DEBUG_MSG(3,
("client hello, adding encrypt_then_mac extension"));
MBEDTLS_SSL_CHK_BUF_PTR(p, end, 4);
MBEDTLS_PUT_UINT16_BE(MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC, p, 0);
p += 2;
*p++ = 0x00;
*p++ = 0x00;
*olen = 4;
return 0;
}
#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_write_extended_ms_ext(mbedtls_ssl_context *ssl,
unsigned char *buf,
const unsigned char *end,
size_t *olen)
{
unsigned char *p = buf;
*olen = 0;
if (ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED) {
return 0;
}
MBEDTLS_SSL_DEBUG_MSG(3,
("client hello, adding extended_master_secret extension"));
MBEDTLS_SSL_CHK_BUF_PTR(p, end, 4);
MBEDTLS_PUT_UINT16_BE(MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET, p, 0);
p += 2;
*p++ = 0x00;
*p++ = 0x00;
*olen = 4;
return 0;
}
#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
#if defined(MBEDTLS_SSL_SESSION_TICKETS)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_write_session_ticket_ext(mbedtls_ssl_context *ssl,
unsigned char *buf,
const unsigned char *end,
size_t *olen)
{
unsigned char *p = buf;
size_t tlen = ssl->session_negotiate->ticket_len;
*olen = 0;
if (ssl->conf->session_tickets == MBEDTLS_SSL_SESSION_TICKETS_DISABLED) {
return 0;
}
MBEDTLS_SSL_DEBUG_MSG(3,
("client hello, adding session ticket extension"));
/* The addition is safe here since the ticket length is 16 bit. */
MBEDTLS_SSL_CHK_BUF_PTR(p, end, 4 + tlen);
MBEDTLS_PUT_UINT16_BE(MBEDTLS_TLS_EXT_SESSION_TICKET, p, 0);
p += 2;
MBEDTLS_PUT_UINT16_BE(tlen, p, 0);
p += 2;
*olen = 4;
if (ssl->session_negotiate->ticket == NULL || tlen == 0) {
return 0;
}
MBEDTLS_SSL_DEBUG_MSG(3,
("sending session ticket of length %" MBEDTLS_PRINTF_SIZET, tlen));
memcpy(p, ssl->session_negotiate->ticket, tlen);
*olen += tlen;
return 0;
}
#endif /* MBEDTLS_SSL_SESSION_TICKETS */
#if defined(MBEDTLS_SSL_DTLS_SRTP)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_write_use_srtp_ext(mbedtls_ssl_context *ssl,
unsigned char *buf,
const unsigned char *end,
size_t *olen)
{
unsigned char *p = buf;
size_t protection_profiles_index = 0, ext_len = 0;
uint16_t mki_len = 0, profile_value = 0;
*olen = 0;
if ((ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM) ||
(ssl->conf->dtls_srtp_profile_list == NULL) ||
(ssl->conf->dtls_srtp_profile_list_len == 0)) {
return 0;
}
/* RFC 5764 section 4.1.1
* uint8 SRTPProtectionProfile[2];
*
* struct {
* SRTPProtectionProfiles SRTPProtectionProfiles;
* opaque srtp_mki<0..255>;
* } UseSRTPData;
* SRTPProtectionProfile SRTPProtectionProfiles<2..2^16-1>;
*/
if (ssl->conf->dtls_srtp_mki_support == MBEDTLS_SSL_DTLS_SRTP_MKI_SUPPORTED) {
mki_len = ssl->dtls_srtp_info.mki_len;
}
/* Extension length = 2 bytes for profiles length,
* ssl->conf->dtls_srtp_profile_list_len * 2 (each profile is 2 bytes length ),
* 1 byte for srtp_mki vector length and the mki_len value
*/
ext_len = 2 + 2 * (ssl->conf->dtls_srtp_profile_list_len) + 1 + mki_len;
MBEDTLS_SSL_DEBUG_MSG(3, ("client hello, adding use_srtp extension"));
/* Check there is room in the buffer for the extension + 4 bytes
* - the extension tag (2 bytes)
* - the extension length (2 bytes)
*/
MBEDTLS_SSL_CHK_BUF_PTR(p, end, ext_len + 4);
MBEDTLS_PUT_UINT16_BE(MBEDTLS_TLS_EXT_USE_SRTP, p, 0);
p += 2;
MBEDTLS_PUT_UINT16_BE(ext_len, p, 0);
p += 2;
/* protection profile length: 2*(ssl->conf->dtls_srtp_profile_list_len) */
/* micro-optimization:
* the list size is limited to MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH
* which is lower than 127, so the upper byte of the length is always 0
* For the documentation, the more generic code is left in comments
* *p++ = (unsigned char)( ( ( 2 * ssl->conf->dtls_srtp_profile_list_len )
* >> 8 ) & 0xFF );
*/
*p++ = 0;
*p++ = MBEDTLS_BYTE_0(2 * ssl->conf->dtls_srtp_profile_list_len);
for (protection_profiles_index = 0;
protection_profiles_index < ssl->conf->dtls_srtp_profile_list_len;
protection_profiles_index++) {
profile_value = mbedtls_ssl_check_srtp_profile_value
(ssl->conf->dtls_srtp_profile_list[protection_profiles_index]);
if (profile_value != MBEDTLS_TLS_SRTP_UNSET) {
MBEDTLS_SSL_DEBUG_MSG(3, ("ssl_write_use_srtp_ext, add profile: %04x",
profile_value));
MBEDTLS_PUT_UINT16_BE(profile_value, p, 0);
p += 2;
} else {
/*
* Note: we shall never arrive here as protection profiles
* is checked by mbedtls_ssl_conf_dtls_srtp_protection_profiles function
*/
MBEDTLS_SSL_DEBUG_MSG(3,
("client hello, "
"illegal DTLS-SRTP protection profile %d",
ssl->conf->dtls_srtp_profile_list[protection_profiles_index]
));
return MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
}
}
*p++ = mki_len & 0xFF;
if (mki_len != 0) {
memcpy(p, ssl->dtls_srtp_info.mki_value, mki_len);
/*
* Increment p to point to the current position.
*/
p += mki_len;
MBEDTLS_SSL_DEBUG_BUF(3, "sending mki", ssl->dtls_srtp_info.mki_value,
ssl->dtls_srtp_info.mki_len);
}
/*
* total extension length: extension type (2 bytes)
* + extension length (2 bytes)
* + protection profile length (2 bytes)
* + 2 * number of protection profiles
* + srtp_mki vector length(1 byte)
* + mki value
*/
*olen = p - buf;
return 0;
}
#endif /* MBEDTLS_SSL_DTLS_SRTP */
int mbedtls_ssl_tls12_write_client_hello_exts(mbedtls_ssl_context *ssl,
unsigned char *buf,
const unsigned char *end,
int uses_ec,
size_t *out_len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
unsigned char *p = buf;
size_t ext_len = 0;
(void) ssl;
(void) end;
(void) uses_ec;
(void) ret;
(void) ext_len;
*out_len = 0;
/* Note that TLS_EMPTY_RENEGOTIATION_INFO_SCSV is always added
* even if MBEDTLS_SSL_RENEGOTIATION is not defined. */
#if defined(MBEDTLS_SSL_RENEGOTIATION)
if ((ret = ssl_write_renegotiation_ext(ssl, p, end, &ext_len)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "ssl_write_renegotiation_ext", ret);
return ret;
}
p += ext_len;
#endif
#if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_1_2_ENABLED) || \
defined(MBEDTLS_KEY_EXCHANGE_ECDSA_CERT_REQ_ALLOWED_ENABLED) || \
defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
if (uses_ec) {
if ((ret = ssl_write_supported_point_formats_ext(ssl, p, end,
&ext_len)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "ssl_write_supported_point_formats_ext", ret);
return ret;
}
p += ext_len;
#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
if ((ret = ssl_write_ecjpake_kkpp_ext(ssl, p, end, &ext_len)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "ssl_write_ecjpake_kkpp_ext", ret);
return ret;
}
p += ext_len;
#endif
}
#endif
#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
if ((ret = ssl_write_cid_ext(ssl, p, end, &ext_len)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "ssl_write_cid_ext", ret);
return ret;
}
p += ext_len;
#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
if ((ret = ssl_write_max_fragment_length_ext(ssl, p, end,
&ext_len)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "ssl_write_max_fragment_length_ext", ret);
return ret;
}
p += ext_len;
#endif
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
if ((ret = ssl_write_encrypt_then_mac_ext(ssl, p, end, &ext_len)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "ssl_write_encrypt_then_mac_ext", ret);
return ret;
}
p += ext_len;
#endif
#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
if ((ret = ssl_write_extended_ms_ext(ssl, p, end, &ext_len)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "ssl_write_extended_ms_ext", ret);
return ret;
}
p += ext_len;
#endif
#if defined(MBEDTLS_SSL_DTLS_SRTP)
if ((ret = ssl_write_use_srtp_ext(ssl, p, end, &ext_len)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "ssl_write_use_srtp_ext", ret);
return ret;
}
p += ext_len;
#endif
#if defined(MBEDTLS_SSL_SESSION_TICKETS)
if ((ret = ssl_write_session_ticket_ext(ssl, p, end, &ext_len)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "ssl_write_session_ticket_ext", ret);
return ret;
}
p += ext_len;
#endif
*out_len = p - buf;
return 0;
}
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_parse_renegotiation_info(mbedtls_ssl_context *ssl,
const unsigned char *buf,
size_t len)
{
#if defined(MBEDTLS_SSL_RENEGOTIATION)
if (ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE) {
/* Check verify-data in constant-time. The length OTOH is no secret */
if (len != 1 + ssl->verify_data_len * 2 ||
buf[0] != ssl->verify_data_len * 2 ||
mbedtls_ct_memcmp(buf + 1,
ssl->own_verify_data, ssl->verify_data_len) != 0 ||
mbedtls_ct_memcmp(buf + 1 + ssl->verify_data_len,
ssl->peer_verify_data, ssl->verify_data_len) != 0) {
MBEDTLS_SSL_DEBUG_MSG(1, ("non-matching renegotiation info"));
mbedtls_ssl_send_alert_message(
ssl,
MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE);
return MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE;
}
} else
#endif /* MBEDTLS_SSL_RENEGOTIATION */
{
if (len != 1 || buf[0] != 0x00) {
MBEDTLS_SSL_DEBUG_MSG(1,
("non-zero length renegotiation info"));
mbedtls_ssl_send_alert_message(
ssl,
MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE);
return MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE;
}
ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION;
}
return 0;
}
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_parse_max_fragment_length_ext(mbedtls_ssl_context *ssl,
const unsigned char *buf,
size_t len)
{
/*
* server should use the extension only if we did,
* and if so the server's value should match ours (and len is always 1)
*/
if (ssl->conf->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE ||
len != 1 ||
buf[0] != ssl->conf->mfl_code) {
MBEDTLS_SSL_DEBUG_MSG(1,
("non-matching max fragment length extension"));
mbedtls_ssl_send_alert_message(
ssl,
MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER);
return MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER;
}
return 0;
}
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_parse_cid_ext(mbedtls_ssl_context *ssl,
const unsigned char *buf,
size_t len)
{
size_t peer_cid_len;
if ( /* CID extension only makes sense in DTLS */
ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ||
/* The server must only send the CID extension if we have offered it. */
ssl->negotiate_cid == MBEDTLS_SSL_CID_DISABLED) {
MBEDTLS_SSL_DEBUG_MSG(1, ("CID extension unexpected"));
mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_EXT);
return MBEDTLS_ERR_SSL_UNSUPPORTED_EXTENSION;
}
if (len == 0) {
MBEDTLS_SSL_DEBUG_MSG(1, ("CID extension invalid"));
mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR);
return MBEDTLS_ERR_SSL_DECODE_ERROR;
}
peer_cid_len = *buf++;
len--;
if (peer_cid_len > MBEDTLS_SSL_CID_OUT_LEN_MAX) {
MBEDTLS_SSL_DEBUG_MSG(1, ("CID extension invalid"));
mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER);
return MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER;
}
if (len != peer_cid_len) {
MBEDTLS_SSL_DEBUG_MSG(1, ("CID extension invalid"));
mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR);
return MBEDTLS_ERR_SSL_DECODE_ERROR;
}
ssl->handshake->cid_in_use = MBEDTLS_SSL_CID_ENABLED;
ssl->handshake->peer_cid_len = (uint8_t) peer_cid_len;
memcpy(ssl->handshake->peer_cid, buf, peer_cid_len);
MBEDTLS_SSL_DEBUG_MSG(3, ("Use of CID extension negotiated"));
MBEDTLS_SSL_DEBUG_BUF(3, "Server CID", buf, peer_cid_len);
return 0;
}
#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_parse_encrypt_then_mac_ext(mbedtls_ssl_context *ssl,
const unsigned char *buf,
size_t len)
{
if (ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED ||
len != 0) {
MBEDTLS_SSL_DEBUG_MSG(1,
("non-matching encrypt-then-MAC extension"));
mbedtls_ssl_send_alert_message(
ssl,
MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_EXT);
return MBEDTLS_ERR_SSL_UNSUPPORTED_EXTENSION;
}
((void) buf);
ssl->session_negotiate->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED;
return 0;
}
#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_parse_extended_ms_ext(mbedtls_ssl_context *ssl,
const unsigned char *buf,
size_t len)
{
if (ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED ||
len != 0) {
MBEDTLS_SSL_DEBUG_MSG(1,
("non-matching extended master secret extension"));
mbedtls_ssl_send_alert_message(
ssl,
MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_EXT);
return MBEDTLS_ERR_SSL_UNSUPPORTED_EXTENSION;
}
((void) buf);
ssl->handshake->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED;
return 0;
}
#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
#if defined(MBEDTLS_SSL_SESSION_TICKETS)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_parse_session_ticket_ext(mbedtls_ssl_context *ssl,
const unsigned char *buf,
size_t len)
{
if (ssl->conf->session_tickets == MBEDTLS_SSL_SESSION_TICKETS_DISABLED ||
len != 0) {
MBEDTLS_SSL_DEBUG_MSG(1,
("non-matching session ticket extension"));
mbedtls_ssl_send_alert_message(
ssl,
MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_EXT);
return MBEDTLS_ERR_SSL_UNSUPPORTED_EXTENSION;
}
((void) buf);
ssl->handshake->new_session_ticket = 1;
return 0;
}
#endif /* MBEDTLS_SSL_SESSION_TICKETS */
#if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_1_2_ENABLED) || \
defined(MBEDTLS_KEY_EXCHANGE_ECDSA_CERT_REQ_ALLOWED_ENABLED) || \
defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_parse_supported_point_formats_ext(mbedtls_ssl_context *ssl,
const unsigned char *buf,
size_t len)
{
size_t list_size;
const unsigned char *p;
if (len == 0 || (size_t) (buf[0] + 1) != len) {
MBEDTLS_SSL_DEBUG_MSG(1, ("bad server hello message"));
mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR);
return MBEDTLS_ERR_SSL_DECODE_ERROR;
}
list_size = buf[0];
p = buf + 1;
while (list_size > 0) {
if (p[0] == MBEDTLS_ECP_PF_UNCOMPRESSED ||
p[0] == MBEDTLS_ECP_PF_COMPRESSED) {
#if !defined(MBEDTLS_USE_PSA_CRYPTO) && \
defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_1_2_ENABLED)
ssl->handshake->ecdh_ctx.point_format = p[0];
#endif /* !MBEDTLS_USE_PSA_CRYPTO && MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_1_2_ENABLED */
#if !defined(MBEDTLS_USE_PSA_CRYPTO) && \
defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
mbedtls_ecjpake_set_point_format(&ssl->handshake->ecjpake_ctx,
p[0]);
#endif /* !MBEDTLS_USE_PSA_CRYPTO && MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
MBEDTLS_SSL_DEBUG_MSG(4, ("point format selected: %d", p[0]));
return 0;
}
list_size--;
p++;
}
MBEDTLS_SSL_DEBUG_MSG(1, ("no point format in common"));
mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE);
return MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE;
}
#endif /* MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_1_2_ENABLED ||
MBEDTLS_KEY_EXCHANGE_ECDSA_CERT_REQ_ALLOWED_ENABLED ||
MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_parse_ecjpake_kkpp(mbedtls_ssl_context *ssl,
const unsigned char *buf,
size_t len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if (ssl->handshake->ciphersuite_info->key_exchange !=
MBEDTLS_KEY_EXCHANGE_ECJPAKE) {
MBEDTLS_SSL_DEBUG_MSG(3, ("skip ecjpake kkpp extension"));
return 0;
}
/* If we got here, we no longer need our cached extension */
mbedtls_free(ssl->handshake->ecjpake_cache);
ssl->handshake->ecjpake_cache = NULL;
ssl->handshake->ecjpake_cache_len = 0;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if ((ret = mbedtls_psa_ecjpake_read_round(
&ssl->handshake->psa_pake_ctx, buf, len,
MBEDTLS_ECJPAKE_ROUND_ONE)) != 0) {
psa_destroy_key(ssl->handshake->psa_pake_password);
psa_pake_abort(&ssl->handshake->psa_pake_ctx);
MBEDTLS_SSL_DEBUG_RET(1, "psa_pake_input round one", ret);
mbedtls_ssl_send_alert_message(
ssl,
MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE);
return ret;
}
return 0;
#else
if ((ret = mbedtls_ecjpake_read_round_one(&ssl->handshake->ecjpake_ctx,
buf, len)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ecjpake_read_round_one", ret);
mbedtls_ssl_send_alert_message(
ssl,
MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE);
return ret;
}
return 0;
#endif /* MBEDTLS_USE_PSA_CRYPTO */
}
#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
#if defined(MBEDTLS_SSL_ALPN)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_parse_alpn_ext(mbedtls_ssl_context *ssl,
const unsigned char *buf, size_t len)
{
size_t list_len, name_len;
const char **p;
/* If we didn't send it, the server shouldn't send it */
if (ssl->conf->alpn_list == NULL) {
MBEDTLS_SSL_DEBUG_MSG(1, ("non-matching ALPN extension"));
mbedtls_ssl_send_alert_message(
ssl,
MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_EXT);
return MBEDTLS_ERR_SSL_UNSUPPORTED_EXTENSION;
}
/*
* opaque ProtocolName<1..2^8-1>;
*
* struct {
* ProtocolName protocol_name_list<2..2^16-1>
* } ProtocolNameList;
*
* the "ProtocolNameList" MUST contain exactly one "ProtocolName"
*/
/* Min length is 2 (list_len) + 1 (name_len) + 1 (name) */
if (len < 4) {
mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR);
return MBEDTLS_ERR_SSL_DECODE_ERROR;
}
list_len = (buf[0] << 8) | buf[1];
if (list_len != len - 2) {
mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR);
return MBEDTLS_ERR_SSL_DECODE_ERROR;
}
name_len = buf[2];
if (name_len != list_len - 1) {
mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR);
return MBEDTLS_ERR_SSL_DECODE_ERROR;
}
/* Check that the server chosen protocol was in our list and save it */
for (p = ssl->conf->alpn_list; *p != NULL; p++) {
if (name_len == strlen(*p) &&
memcmp(buf + 3, *p, name_len) == 0) {
ssl->alpn_chosen = *p;
return 0;
}
}
MBEDTLS_SSL_DEBUG_MSG(1, ("ALPN extension: no matching protocol"));
mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE);
return MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE;
}
#endif /* MBEDTLS_SSL_ALPN */
#if defined(MBEDTLS_SSL_DTLS_SRTP)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_parse_use_srtp_ext(mbedtls_ssl_context *ssl,
const unsigned char *buf,
size_t len)
{
mbedtls_ssl_srtp_profile server_protection = MBEDTLS_TLS_SRTP_UNSET;
size_t i, mki_len = 0;
uint16_t server_protection_profile_value = 0;
/* If use_srtp is not configured, just ignore the extension */
if ((ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM) ||
(ssl->conf->dtls_srtp_profile_list == NULL) ||
(ssl->conf->dtls_srtp_profile_list_len == 0)) {
return 0;
}
/* RFC 5764 section 4.1.1
* uint8 SRTPProtectionProfile[2];
*
* struct {
* SRTPProtectionProfiles SRTPProtectionProfiles;
* opaque srtp_mki<0..255>;
* } UseSRTPData;
* SRTPProtectionProfile SRTPProtectionProfiles<2..2^16-1>;