diff options
author | Matt Caswell <matt@openssl.org> | 2015-08-04 17:36:02 +0100 |
---|---|---|
committer | Matt Caswell <matt@openssl.org> | 2015-09-07 10:45:38 +0100 |
commit | 50932c4af2fdd1da01203e9fabe176f9c106882b (patch) | |
tree | ced91433db18898536f2282a590ca50f13101749 /ssl | |
parent | 0e2d091103ed5846c72a5c9e8b10e25ead4bf152 (diff) |
PACKETise ServerHello processing
Process ServerHello messages using the PACKET API
Reviewed-by: Tim Hudson <tjh@openssl.org>
Diffstat (limited to 'ssl')
-rw-r--r-- | ssl/d1_srtp.c | 24 | ||||
-rw-r--r-- | ssl/s3_clnt.c | 116 | ||||
-rw-r--r-- | ssl/ssl_locl.h | 8 | ||||
-rw-r--r-- | ssl/t1_lib.c | 99 | ||||
-rw-r--r-- | ssl/t1_reneg.c | 25 |
5 files changed, 157 insertions, 115 deletions
diff --git a/ssl/d1_srtp.c b/ssl/d1_srtp.c index 4384edabc6..87dbcc63f3 100644 --- a/ssl/d1_srtp.c +++ b/ssl/d1_srtp.c @@ -358,33 +358,27 @@ int ssl_add_serverhello_use_srtp_ext(SSL *s, unsigned char *p, int *len, return 0; } -int ssl_parse_serverhello_use_srtp_ext(SSL *s, unsigned char *d, int len, - int *al) +int ssl_parse_serverhello_use_srtp_ext(SSL *s, PACKET *pkt, int *al) { - unsigned id; + unsigned int id, ct, mki; int i; - int ct; STACK_OF(SRTP_PROTECTION_PROFILE) *clnt; SRTP_PROTECTION_PROFILE *prof; - if (len != 5) { - SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT, - SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); - *al = SSL_AD_DECODE_ERROR; - return 1; - } - - n2s(d, ct); - if (ct != 2) { + if (!PACKET_get_net_2(pkt, &ct) + || ct != 2 + || !PACKET_get_net_2(pkt, &id) + || !PACKET_get_1(pkt, &mki) + || PACKET_remaining(pkt) != 0) { SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT, SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); *al = SSL_AD_DECODE_ERROR; return 1; } - n2s(d, id); - if (*d) { /* Must be no MKI, since we never offer one */ + if (mki != 0) { + /* Must be no MKI, since we never offer one */ SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT, SSL_R_BAD_SRTP_MKI_VALUE); *al = SSL_AD_ILLEGAL_PARAMETER; diff --git a/ssl/s3_clnt.c b/ssl/s3_clnt.c index ba35fb9ca5..b27cba218c 100644 --- a/ssl/s3_clnt.c +++ b/ssl/s3_clnt.c @@ -930,9 +930,10 @@ int ssl3_get_server_hello(SSL *s) { STACK_OF(SSL_CIPHER) *sk; const SSL_CIPHER *c; - unsigned char *p, *d; + PACKET pkt; + unsigned char *session_id, *cipherchars; int i, al = SSL_AD_INTERNAL_ERROR, ok; - unsigned int j; + unsigned int j, ciphercharlen; long n; #ifndef OPENSSL_NO_COMP SSL_COMP *comp; @@ -971,10 +972,20 @@ int ssl3_get_server_hello(SSL *s) goto f_err; } - d = p = (unsigned char *)s->init_msg; + if (!PACKET_buf_init(&pkt, s->init_msg, n)) { + al = SSL_AD_INTERNAL_ERROR; + SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR); + goto f_err; + } if (s->method->version == TLS_ANY_VERSION) { - int sversion = (p[0] << 8) | p[1]; + unsigned int sversion; + + if (!PACKET_get_net_2(&pkt, &sversion)) { + al = SSL_AD_DECODE_ERROR; + SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_LENGTH_MISMATCH); + goto f_err; + } #if TLS_MAX_VERSION != TLS1_2_VERSION #error Code needs updating for new TLS version @@ -1012,8 +1023,16 @@ int ssl3_get_server_hello(SSL *s) } } else if (s->method->version == DTLS_ANY_VERSION) { /* Work out correct protocol version to use */ - int hversion = (p[0] << 8) | p[1]; - int options = s->options; + unsigned int hversion; + int options; + + if (!PACKET_get_net_2(&pkt, &hversion)) { + al = SSL_AD_DECODE_ERROR; + SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_LENGTH_MISMATCH); + goto f_err; + } + + options = s->options; if (hversion == DTLS1_2_VERSION && !(options & SSL_OP_NO_DTLSv1_2)) s->method = DTLSv1_2_client_method(); else if (tls1_suiteb(s)) { @@ -1031,30 +1050,43 @@ int ssl3_get_server_hello(SSL *s) goto f_err; } s->session->ssl_version = s->version = s->method->version; - } else if ((p[0] != (s->version >> 8)) || (p[1] != (s->version & 0xff))) { - SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION); - s->version = (s->version & 0xff00) | p[1]; - al = SSL_AD_PROTOCOL_VERSION; - goto f_err; + } else { + unsigned char *vers; + + if (!PACKET_get_bytes(&pkt, &vers, 2)) { + al = SSL_AD_DECODE_ERROR; + SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_LENGTH_MISMATCH); + goto f_err; + } + if ((vers[0] != (s->version >> 8)) + || (vers[1] != (s->version & 0xff))) { + SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION); + s->version = (s->version & 0xff00) | vers[1]; + al = SSL_AD_PROTOCOL_VERSION; + goto f_err; + } } - p += 2; /* load the server hello data */ /* load the server random */ - memcpy(s->s3->server_random, p, SSL3_RANDOM_SIZE); - p += SSL3_RANDOM_SIZE; + if (!PACKET_copy_bytes(&pkt, s->s3->server_random, SSL3_RANDOM_SIZE)) { + al = SSL_AD_DECODE_ERROR; + SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_LENGTH_MISMATCH); + goto f_err; + } s->hit = 0; - /* get the session-id */ - j = *(p++); - - if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE)) { + /* get the session-id length */ + if (!PACKET_get_1(&pkt, &j) + || (j > sizeof s->session->session_id) + || (j > SSL3_SESSION_ID_SIZE)) { al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_SSL3_SESSION_ID_TOO_LONG); goto f_err; } + ciphercharlen = ssl_put_cipher_by_char(s, NULL, NULL); /* * Check if we can resume the session based on external pre-shared secret. * EAP-FAST (RFC 4851) supports two types of session resumption. @@ -1070,22 +1102,42 @@ int ssl3_get_server_hello(SSL *s) if (s->version >= TLS1_VERSION && s->tls_session_secret_cb && s->session->tlsext_tick) { SSL_CIPHER *pref_cipher = NULL; + size_t bookm; + if (!PACKET_get_bookmark(&pkt, &bookm) + || !PACKET_forward(&pkt, j) + || !PACKET_get_bytes(&pkt, &cipherchars, ciphercharlen)) { + SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_LENGTH_MISMATCH); + al = SSL_AD_DECODE_ERROR; + goto f_err; + } s->session->master_key_length = sizeof(s->session->master_key); if (s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length, NULL, &pref_cipher, s->tls_session_secret_cb_arg)) { s->session->cipher = pref_cipher ? - pref_cipher : ssl_get_cipher_by_char(s, p + j); + pref_cipher : ssl_get_cipher_by_char(s, cipherchars); } else { SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR); al = SSL_AD_INTERNAL_ERROR; goto f_err; } + if (!PACKET_goto_bookmark(&pkt, bookm)) { + SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR); + al = SSL_AD_INTERNAL_ERROR; + goto f_err; + } + } + + /* Get the session id */ + if (!PACKET_get_bytes(&pkt, &session_id, j)) { + SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_LENGTH_MISMATCH); + al = SSL_AD_DECODE_ERROR; + goto f_err; } if (j != 0 && j == s->session->session_id_length - && memcmp(p, s->session->session_id, j) == 0) { + && memcmp(session_id, s->session->session_id, j) == 0) { if (s->sid_ctx_length != s->session->sid_ctx_length || memcmp(s->session->sid_ctx, s->sid_ctx, s->sid_ctx_length)) { /* actually a client application bug */ @@ -1109,10 +1161,15 @@ int ssl3_get_server_hello(SSL *s) } } s->session->session_id_length = j; - memcpy(s->session->session_id, p, j); /* j could be 0 */ + memcpy(s->session->session_id, session_id, j); /* j could be 0 */ } - p += j; - c = ssl_get_cipher_by_char(s, p); + + if (!PACKET_get_bytes(&pkt, &cipherchars, ciphercharlen)) { + SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_LENGTH_MISMATCH); + al = SSL_AD_DECODE_ERROR; + goto f_err; + } + c = ssl_get_cipher_by_char(s, cipherchars); if (c == NULL) { /* unknown cipher */ al = SSL_AD_ILLEGAL_PARAMETER; @@ -1133,7 +1190,6 @@ int ssl3_get_server_hello(SSL *s) SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED); goto f_err; } - p += ssl_put_cipher_by_char(s, NULL, NULL); sk = ssl_get_ciphers_by_id(s); i = sk_SSL_CIPHER_find(sk, c); @@ -1166,8 +1222,13 @@ int ssl3_get_server_hello(SSL *s) goto f_err; /* lets get the compression algorithm */ /* COMPRESSION */ + if (!PACKET_get_1(&pkt, &j)) { + SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_LENGTH_MISMATCH); + al = SSL_AD_DECODE_ERROR; + goto f_err; + } #ifdef OPENSSL_NO_COMP - if (*(p++) != 0) { + if (j != 0) { al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); @@ -1182,7 +1243,6 @@ int ssl3_get_server_hello(SSL *s) goto f_err; } #else - j = *(p++); if (s->hit && j != s->session->compress_meth) { al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, @@ -1209,12 +1269,12 @@ int ssl3_get_server_hello(SSL *s) #endif /* TLS extensions */ - if (!ssl_parse_serverhello_tlsext(s, &p, d, n)) { + if (!ssl_parse_serverhello_tlsext(s, &pkt)) { SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_PARSE_TLSEXT); goto err; } - if (p != (d + n)) { + if (PACKET_remaining(&pkt) != 0) { /* wrong packet length */ al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_PACKET_LENGTH); diff --git a/ssl/ssl_locl.h b/ssl/ssl_locl.h index 79926ff2b0..2539a4e344 100644 --- a/ssl/ssl_locl.h +++ b/ssl/ssl_locl.h @@ -2088,8 +2088,7 @@ __owur unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *buf, __owur int ssl_parse_clienthello_tlsext(SSL *s, PACKET *pkt); __owur int tls1_set_server_sigalgs(SSL *s); __owur int ssl_check_clienthello_tlsext_late(SSL *s); -__owur int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **data, - unsigned char *d, int n); +__owur int ssl_parse_serverhello_tlsext(SSL *s, PACKET *pkt); __owur int ssl_prepare_clienthello_tlsext(SSL *s); __owur int ssl_prepare_serverhello_tlsext(SSL *s); @@ -2126,7 +2125,7 @@ __owur EVP_MD_CTX *ssl_replace_hash(EVP_MD_CTX **hash, const EVP_MD *md); void ssl_clear_hash_ctx(EVP_MD_CTX **hash); __owur int ssl_add_serverhello_renegotiate_ext(SSL *s, unsigned char *p, int *len, int maxlen); -__owur int ssl_parse_serverhello_renegotiate_ext(SSL *s, unsigned char *d, int len, +__owur int ssl_parse_serverhello_renegotiate_ext(SSL *s, PACKET *pkt, int *al); __owur int ssl_add_clienthello_renegotiate_ext(SSL *s, unsigned char *p, int *len, int maxlen); @@ -2147,8 +2146,7 @@ __owur int ssl_add_clienthello_use_srtp_ext(SSL *s, unsigned char *p, int *len, __owur int ssl_parse_clienthello_use_srtp_ext(SSL *s, PACKET *pkt, int *al); __owur int ssl_add_serverhello_use_srtp_ext(SSL *s, unsigned char *p, int *len, int maxlen); -__owur int ssl_parse_serverhello_use_srtp_ext(SSL *s, unsigned char *d, int len, - int *al); +__owur int ssl_parse_serverhello_use_srtp_ext(SSL *s, PACKET *pkt, int *al); __owur int ssl_handshake_hash(SSL *s, unsigned char *out, int outlen); diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c index f0042886c6..95b4fb694d 100644 --- a/ssl/t1_lib.c +++ b/ssl/t1_lib.c @@ -2344,28 +2344,23 @@ int ssl_parse_clienthello_tlsext(SSL *s, PACKET *pkt) * elements of zero length are allowed and the set of elements must exactly * fill the length of the block. */ -static char ssl_next_proto_validate(unsigned char *d, unsigned len) +static char ssl_next_proto_validate(PACKET *pkt) { - unsigned int off = 0; + unsigned int len; - while (off < len) { - if (d[off] == 0) + while (PACKET_remaining(pkt)) { + if (!PACKET_get_1(pkt, &len) + || !PACKET_forward(pkt, len)) return 0; - off += d[off]; - off++; } - return off == len; + return 1; } #endif -static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, - unsigned char *d, int n, int *al) +static int ssl_scan_serverhello_tlsext(SSL *s, PACKET *pkt, int *al) { - unsigned short length; - unsigned short type; - unsigned short size; - unsigned char *data = *p; + unsigned int length, type, size; int tlsext_servername = 0; int renegotiate_seen = 0; @@ -2385,27 +2380,27 @@ static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC; #endif - if (data >= (d + n - 2)) + if (!PACKET_get_net_2(pkt, &length)) goto ri_check; - n2s(data, length); - if (data + length != d + n) { + if (PACKET_remaining(pkt) != length) { *al = SSL_AD_DECODE_ERROR; return 0; } - while (data <= (d + n - 4)) { - n2s(data, type); - n2s(data, size); + while (PACKET_get_net_2(pkt, &type) && PACKET_get_net_2(pkt, &size)) { + unsigned char *data; + PACKET spkt; - if (data + size > (d + n)) + if (!PACKET_get_sub_packet(pkt, &spkt, size) + || !PACKET_peek_bytes(&spkt, &data, size)) goto ri_check; if (s->tlsext_debug_cb) s->tlsext_debug_cb(s, 1, type, data, size, s->tlsext_debug_arg); if (type == TLSEXT_TYPE_renegotiate) { - if (!ssl_parse_serverhello_renegotiate_ext(s, data, size, al)) + if (!ssl_parse_serverhello_renegotiate_ext(s, &spkt, al)) return 0; renegotiate_seen = 1; } else if (s->version == SSL3_VERSION) { @@ -2418,10 +2413,9 @@ static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, } #ifndef OPENSSL_NO_EC else if (type == TLSEXT_TYPE_ec_point_formats) { - unsigned char *sdata = data; - int ecpointformatlist_length = *(sdata++); - - if (ecpointformatlist_length != size - 1) { + unsigned int ecpointformatlist_length; + if (!PACKET_get_1(&spkt, &ecpointformatlist_length) + || ecpointformatlist_length != size - 1) { *al = TLS1_AD_DECODE_ERROR; return 0; } @@ -2435,8 +2429,13 @@ static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, } s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length; - memcpy(s->session->tlsext_ecpointformatlist, sdata, - ecpointformatlist_length); + if (!PACKET_copy_bytes(&spkt, + s->session->tlsext_ecpointformatlist, + ecpointformatlist_length)) { + *al = TLS1_AD_DECODE_ERROR; + return 0; + } + } } #endif /* OPENSSL_NO_EC */ @@ -2472,14 +2471,13 @@ static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, s->s3->tmp.finish_md_len == 0) { unsigned char *selected; unsigned char selected_len; - /* We must have requested it. */ if (s->ctx->next_proto_select_cb == NULL) { *al = TLS1_AD_UNSUPPORTED_EXTENSION; return 0; } /* The data must be valid */ - if (!ssl_next_proto_validate(data, size)) { + if (!ssl_next_proto_validate(&spkt)) { *al = TLS1_AD_DECODE_ERROR; return 0; } @@ -2504,31 +2502,21 @@ static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, else if (type == TLSEXT_TYPE_application_layer_protocol_negotiation) { unsigned len; - /* We must have requested it. */ if (s->alpn_client_proto_list == NULL) { *al = TLS1_AD_UNSUPPORTED_EXTENSION; return 0; } - if (size < 4) { - *al = TLS1_AD_DECODE_ERROR; - return 0; - } /*- * The extension data consists of: * uint16 list_length * uint8 proto_length; * uint8 proto[proto_length]; */ - len = data[0]; - len <<= 8; - len |= data[1]; - if (len != (unsigned)size - 2) { - *al = TLS1_AD_DECODE_ERROR; - return 0; - } - len = data[2]; - if (len != (unsigned)size - 3) { + if (!PACKET_get_net_2(&spkt, &len) + || PACKET_remaining(&spkt) != len + || !PACKET_get_1(&spkt, &len) + || PACKET_remaining(&spkt) != len) { *al = TLS1_AD_DECODE_ERROR; return 0; } @@ -2538,12 +2526,20 @@ static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, *al = TLS1_AD_INTERNAL_ERROR; return 0; } - memcpy(s->s3->alpn_selected, data + 3, len); + if (!PACKET_copy_bytes(&spkt, s->s3->alpn_selected, len)) { + *al = TLS1_AD_DECODE_ERROR; + return 0; + } s->s3->alpn_selected_len = len; } #ifndef OPENSSL_NO_HEARTBEATS else if (type == TLSEXT_TYPE_heartbeat) { - switch (data[0]) { + unsigned int hbtype; + if (!PACKET_get_1(&spkt, &hbtype)) { + *al = SSL_AD_DECODE_ERROR; + return 0; + } + switch (hbtype) { case 0x01: /* Server allows us to send HB requests */ s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED; break; @@ -2559,7 +2555,7 @@ static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, #endif #ifndef OPENSSL_NO_SRTP else if (SSL_IS_DTLS(s) && type == TLSEXT_TYPE_use_srtp) { - if (ssl_parse_serverhello_use_srtp_ext(s, data, size, al)) + if (ssl_parse_serverhello_use_srtp_ext(s, &spkt, al)) return 0; } #endif @@ -2581,11 +2577,9 @@ static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, */ else if (custom_ext_parse(s, 0, type, data, size, al) <= 0) return 0; - - data += size; } - if (data != d + n) { + if (PACKET_remaining(pkt) != 0) { *al = SSL_AD_DECODE_ERROR; return 0; } @@ -2605,8 +2599,6 @@ static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, } } - *p = data; - ri_check: /* @@ -2887,13 +2879,12 @@ int ssl_check_serverhello_tlsext(SSL *s) } } -int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, - int n) +int ssl_parse_serverhello_tlsext(SSL *s, PACKET *pkt) { int al = -1; if (s->version < SSL3_VERSION) return 1; - if (ssl_scan_serverhello_tlsext(s, p, d, n, &al) <= 0) { + if (ssl_scan_serverhello_tlsext(s, pkt, &al) <= 0) { ssl3_send_alert(s, SSL3_AL_FATAL, al); return 0; } diff --git a/ssl/t1_reneg.c b/ssl/t1_reneg.c index 22a71fed49..3fb6a96a4d 100644 --- a/ssl/t1_reneg.c +++ b/ssl/t1_reneg.c @@ -220,29 +220,27 @@ int ssl_add_serverhello_renegotiate_ext(SSL *s, unsigned char *p, int *len, /* * Parse the server's renegotiation binding and abort if it's not right */ -int ssl_parse_serverhello_renegotiate_ext(SSL *s, unsigned char *d, int len, - int *al) +int ssl_parse_serverhello_renegotiate_ext(SSL *s, PACKET *pkt, int *al) { - int expected_len = s->s3->previous_client_finished_len + unsigned int expected_len = s->s3->previous_client_finished_len + s->s3->previous_server_finished_len; - int ilen; + unsigned int ilen; + unsigned char *data; /* Check for logic errors */ OPENSSL_assert(!expected_len || s->s3->previous_client_finished_len); OPENSSL_assert(!expected_len || s->s3->previous_server_finished_len); /* Parse the length byte */ - if (len < 1) { + if (!PACKET_get_1(pkt, &ilen)) { SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT, SSL_R_RENEGOTIATION_ENCODING_ERR); *al = SSL_AD_ILLEGAL_PARAMETER; return 0; } - ilen = *d; - d++; /* Consistency check */ - if (ilen + 1 != len) { + if (PACKET_remaining(pkt) != ilen) { SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT, SSL_R_RENEGOTIATION_ENCODING_ERR); *al = SSL_AD_ILLEGAL_PARAMETER; @@ -257,17 +255,18 @@ int ssl_parse_serverhello_renegotiate_ext(SSL *s, unsigned char *d, int len, return 0; } - if (memcmp(d, s->s3->previous_client_finished, - s->s3->previous_client_finished_len)) { + if (!PACKET_get_bytes(pkt, &data, s->s3->previous_client_finished_len) + || memcmp(data, s->s3->previous_client_finished, + s->s3->previous_client_finished_len) != 0) { SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT, SSL_R_RENEGOTIATION_MISMATCH); *al = SSL_AD_HANDSHAKE_FAILURE; return 0; } - d += s->s3->previous_client_finished_len; - if (memcmp(d, s->s3->previous_server_finished, - s->s3->previous_server_finished_len)) { + if (!PACKET_get_bytes(pkt, &data, s->s3->previous_server_finished_len) + || memcmp(data, s->s3->previous_server_finished, + s->s3->previous_server_finished_len) != 0) { SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT, SSL_R_RENEGOTIATION_MISMATCH); *al = SSL_AD_ILLEGAL_PARAMETER; |