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Provide server side extension init and finalisation functions

Browse source 
Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
This commit is contained in:
Matt Caswell 2016-11-25 23:19:56 +00:00
parent 68db4ddab7
commit 805a2e9e13
5 changed files with 305 additions and 182 deletions
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1
include/openssl/ssl.h
View file

@ -2308,6 +2308,7 @@ int ERR_load_SSL_strings(void);
# define SSL_F_TLS_CONSTRUCT_SERVER_SESSION_TICKET 460
# define SSL_F_TLS_CONSTRUCT_SERVER_STATUS_REQUEST 461
# define SSL_F_TLS_CONSTRUCT_SERVER_USE_SRTP 462
# define SSL_F_TLS_EXT_FINAL_RENEGOTIATE 483
# define SSL_F_TLS_GET_MESSAGE_BODY 351
# define SSL_F_TLS_GET_MESSAGE_HEADER 387
# define SSL_F_TLS_PARSE_CLIENTHELLO_TLSEXT 449

1
ssl/ssl_err.c
View file

@ -338,6 +338,7 @@ static ERR_STRING_DATA SSL_str_functs[] = {
"tls_construct_server_status_request"},
{ERR_FUNC(SSL_F_TLS_CONSTRUCT_SERVER_USE_SRTP),
"tls_construct_server_use_srtp"},
{ERR_FUNC(SSL_F_TLS_EXT_FINAL_RENEGOTIATE), "tls_ext_final_renegotiate"},
{ERR_FUNC(SSL_F_TLS_GET_MESSAGE_BODY), "tls_get_message_body"},
{ERR_FUNC(SSL_F_TLS_GET_MESSAGE_HEADER), "tls_get_message_header"},
{ERR_FUNC(SSL_F_TLS_PARSE_CLIENTHELLO_TLSEXT),

263
ssl/statem/extensions.c
View file

@ -11,12 +11,31 @@
#include "../ssl_locl.h"
#include "statem_locl.h"
static int tls_ext_final_renegotiate(SSL *s, unsigned int context, int sent,
int *al);
static int tls_ext_init_server_name(SSL *s, unsigned int context);
static int tls_ext_final_server_name(SSL *s, unsigned int context, int sent,
int *al);
static int tls_ext_init_status_request(SSL *s, unsigned int context);
#ifndef OPENSSL_NO_NEXTPROTONEG
static int tls_ext_init_npn(SSL *s, unsigned int context);
#endif
static int tls_ext_init_alpn(SSL *s, unsigned int context);
static int tls_ext_init_sig_algs(SSL *s, unsigned int context);
#ifndef OPENSSL_NO_SRP
static int tls_ext_init_srp(SSL *s, unsigned int context);
#endif
static int tls_ext_init_etm(SSL *s, unsigned int context);
#ifndef OPENSSL_NO_SRTP
static int tls_ext_init_srtp(SSL *s, unsigned int context);
#endif
typedef struct {
/* The ID for the extension */
unsigned int type;
/*
* Initialise extension before parsing. Always called even if extension not
* present
* Initialise extension before parsing. Always called for relevant contexts
* even if extension not present
*/
int (*init_ext)(SSL *s, unsigned int context);
/* Parse extension received by server from client */
@ -28,10 +47,11 @@ typedef struct {
/* Construct extension sent by client */
int (*construct_client_ext)(SSL *s, WPACKET *pkt, int *al);
/*
* Finalise extension after parsing. Always called even if extension not
* present
* Finalise extension after parsing. Always called where an extensions was
* initialised even if the extension was not present. |sent| is set to 1 if
* the extension was seen, or 0 otherwise.
*/
int (*finalise_ext)(SSL *s, unsigned int context);
int (*finalise_ext)(SSL *s, unsigned int context, int sent, int *al);
unsigned int context;
} EXTENSION_DEFINITION;
@ -48,31 +68,31 @@ static const EXTENSION_DEFINITION ext_defs[] = {
tls_parse_server_renegotiate,
tls_construct_server_renegotiate,
tls_construct_client_renegotiate,
NULL,
tls_ext_final_renegotiate,
EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO | EXT_SSL3_ALLOWED
| EXT_TLS1_2_AND_BELOW_ONLY
},
{
TLSEXT_TYPE_server_name,
NULL,
tls_ext_init_server_name,
tls_parse_client_server_name,
tls_parse_server_server_name,
tls_construct_server_server_name,
tls_construct_client_server_name,
NULL,
tls_ext_final_server_name,
EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO
| EXT_TLS1_3_ENCRYPTED_EXTENSIONS
},
#ifndef OPENSSL_NO_SRP
{
TLSEXT_TYPE_srp,
NULL,
tls_ext_init_srp,
tls_parse_client_srp,
NULL,
NULL,
tls_construct_client_srp,
NULL,
EXT_CLIENT_HELLO | EXT_TLS1_2_SERVER_HELLO | EXT_TLS1_2_AND_BELOW_ONLY
EXT_CLIENT_HELLO | EXT_TLS1_2_AND_BELOW_ONLY
},
#endif
#ifndef OPENSSL_NO_EC
@ -109,7 +129,7 @@ static const EXTENSION_DEFINITION ext_defs[] = {
},
{
TLSEXT_TYPE_signature_algorithms,
NULL,
tls_ext_init_sig_algs,
tls_parse_client_sig_algs,
NULL,
NULL,
@ -120,7 +140,7 @@ static const EXTENSION_DEFINITION ext_defs[] = {
#ifndef OPENSSL_NO_OCSP
{
TLSEXT_TYPE_status_request,
NULL,
tls_ext_init_status_request,
tls_parse_client_status_request,
tls_parse_server_status_request,
tls_construct_server_status_request,
@ -133,7 +153,7 @@ static const EXTENSION_DEFINITION ext_defs[] = {
#ifndef OPENSSL_NO_NEXTPROTONEG
{
TLSEXT_TYPE_next_proto_neg,
NULL,
tls_ext_init_npn,
tls_parse_client_npn,
tls_parse_server_npn,
tls_construct_server_next_proto_neg,
@ -144,7 +164,7 @@ static const EXTENSION_DEFINITION ext_defs[] = {
#endif
{
TLSEXT_TYPE_application_layer_protocol_negotiation,
NULL,
tls_ext_init_alpn,
tls_parse_client_alpn,
tls_parse_server_alpn,
tls_construct_server_alpn,
@ -156,7 +176,7 @@ static const EXTENSION_DEFINITION ext_defs[] = {
#ifndef OPENSSL_NO_SRTP
{
TLSEXT_TYPE_use_srtp,
NULL,
tls_ext_init_srtp,
tls_parse_client_use_srtp,
tls_parse_server_use_srtp,
tls_construct_server_use_srtp,
@ -168,7 +188,7 @@ static const EXTENSION_DEFINITION ext_defs[] = {
#endif
{
TLSEXT_TYPE_encrypt_then_mac,
NULL,
tls_ext_init_etm,
tls_parse_client_etm,
tls_parse_server_etm,
tls_construct_server_etm,
@ -329,6 +349,21 @@ static int find_extension_definition(SSL *s, unsigned int type,
return 0;
}
static int extension_is_relevant(SSL *s, unsigned int extctx,
unsigned int thisctx)
{
if ((SSL_IS_DTLS(s)
&& (extctx & EXT_TLS_IMPLEMENTATION_ONLY) != 0)
|| (s->version == SSL3_VERSION
&& (extctx & EXT_SSL3_ALLOWED) == 0)
|| (SSL_IS_TLS13(s)
&& (extctx & EXT_TLS1_2_AND_BELOW_ONLY) != 0)
|| (!SSL_IS_TLS13(s) && (extctx & EXT_TLS1_3_ONLY) != 0))
return 0;
return 1;
}
/*
* Gather a list of all the extensions from the data in |packet]. |context|
* tells us which message this extension is for. Ttls_parse_server_ec_pt_formatshe raw extension data is
@ -413,12 +448,20 @@ int tls_collect_extensions(SSL *s, PACKET *packet, unsigned int context,
*/
for (i = 0; i < OSSL_NELEM(ext_defs); i++) {
if(ext_defs[i].init_ext != NULL && (ext_defs[i].context & context) != 0
&& extension_is_relevant(s, ext_defs[i].context, context)
&& !ext_defs[i].init_ext(s, context)) {
*ad = SSL_AD_INTERNAL_ERROR;
goto err;
}
}
/*
* Initialise server side custom extensions. Client side is done during
* construction of extensions for the ClientHello.
*/
if ((context & (EXT_TLS1_2_SERVER_HELLO | EXT_TLS1_3_SERVER_HELLO)) != 0)
custom_ext_init(&s->cert->srv_ext);
*res = raw_extensions;
*numfound = num_extensions;
return 1;
@ -429,11 +472,13 @@ int tls_collect_extensions(SSL *s, PACKET *packet, unsigned int context,
}
/*
* Parse all remaining extensions that have not yet been parsed. Also calls the
* finalisation for all extensions at the end. Returns 1 for success or 0 for
* failure. On failure, |*al| is populated with a suitable alert code.
* Runs the parsers for all of the extensions in the given list |exts|, which
* should have |numexts| extensions in it. The parsers are only run if they are
* applicable for the given |context| and the parser has not already been run
* for that extension. Returns 1 on success or 0 on failure. In the event of a
* failure |*al| is populated with a suitable alert code.
*/
int tls_parse_all_extensions(SSL *s, int context, RAW_EXTENSION *exts,
static int tls_parse_extension_list(SSL *s, int context, RAW_EXTENSION *exts,
size_t numexts, int *al)
{
size_t loop;
@ -461,14 +506,7 @@ int tls_parse_all_extensions(SSL *s, int context, RAW_EXTENSION *exts,
: extdef->parse_server_ext;
/* Check if extension is defined for our protocol. If not, skip */
if ((SSL_IS_DTLS(s)
&& (extdef->context & EXT_TLS_IMPLEMENTATION_ONLY) != 0)
|| (s->version == SSL3_VERSION
&& (extdef->context & EXT_SSL3_ALLOWED) == 0)
|| (SSL_IS_TLS13(s)
&& (extdef->context & EXT_TLS1_2_AND_BELOW_ONLY) != 0)
|| (!SSL_IS_TLS13(s)
&& (extdef->context & EXT_TLS1_3_ONLY) != 0))
if (!extension_is_relevant(s, extdef->context, context))
continue;
}
@ -497,15 +535,44 @@ int tls_parse_all_extensions(SSL *s, int context, RAW_EXTENSION *exts,
return 0;
}
return 1;
}
/*
* Parse all remaining extensions that have not yet been parsed. Also calls the
* finalisation for all extensions at the end. The given extensions must be in
* order of type (which happens by default during collection). Returns 1 for
* success or 0 for failure. On failure, |*al| is populated with a suitable
* alert code.
*/
int tls_parse_all_extensions(SSL *s, int context, RAW_EXTENSION *exts,
size_t numexts, int *al)
{
size_t loop;
if (!tls_parse_extension_list(s, context, exts, numexts, al))
return 0;
/*
* Finalise all known extensions relevant to this context, whether we have
* found them or not
*/
for (loop = 0; loop < OSSL_NELEM(ext_defs); loop++) {
if(ext_defs[loop].finalise_ext != NULL
&& (ext_defs[loop].context & context) != 0
&& !ext_defs[loop].finalise_ext(s, context)) {
*al = SSL_AD_INTERNAL_ERROR;
&& (ext_defs[loop].context & context) != 0) {
size_t curr;
/*
* Work out whether this extension was sent or not. The sent
* extensions in |exts| are sorted by order of type
*/
for (curr = 0; curr < numexts
&& exts[curr].type < ext_defs[loop].type; curr++)
continue;
if (!ext_defs[loop].finalise_ext(s, context,
(curr < numexts && exts[curr].type == ext_defs[loop].type),
al))
return 0;
}
}
@ -527,7 +594,7 @@ int tls_parse_extension(SSL *s, int type, int context, RAW_EXTENSION *exts,
if (ext == NULL)
return 1;
return tls_parse_all_extensions(s, context, ext, 1, al);
return tls_parse_extension_list(s, context, ext, 1, al);
}
int tls_construct_extensions(SSL *s, WPACKET *pkt, unsigned int context,
@ -624,3 +691,135 @@ int tls_construct_extensions(SSL *s, WPACKET *pkt, unsigned int context,
return 1;
}
static int tls_ext_final_renegotiate(SSL *s, unsigned int context, int sent,
int *al)
{
if (!s->server)
return 1;
/* Need RI if renegotiating */
if (s->renegotiate
&& !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)
&& !sent) {
*al = SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_TLS_EXT_FINAL_RENEGOTIATE,
SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
return 0;
}
return 1;
}
static int tls_ext_init_server_name(SSL *s, unsigned int context)
{
if (s->server)
s->servername_done = 0;
return 1;
}
/* Call the servername callback. Returns 1 for success or 0 for failure. */
static int tls_ext_final_server_name(SSL *s, unsigned int context, int sent,
int *al)
{
int ret = SSL_TLSEXT_ERR_NOACK;
int altmp = SSL_AD_UNRECOGNIZED_NAME;
if (!s->server)
return 1;
if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
ret = s->ctx->tlsext_servername_callback(s, &altmp,
s->ctx->tlsext_servername_arg);
else if (s->initial_ctx != NULL
&& s->initial_ctx->tlsext_servername_callback != 0)
ret = s->initial_ctx->tlsext_servername_callback(s, &altmp,
s->initial_ctx->tlsext_servername_arg);
switch (ret) {
case SSL_TLSEXT_ERR_ALERT_FATAL:
*al = altmp;
return 0;
case SSL_TLSEXT_ERR_ALERT_WARNING:
*al = altmp;
return 1;
case SSL_TLSEXT_ERR_NOACK:
s->servername_done = 0;
return 1;
default:
return 1;
}
}
static int tls_ext_init_status_request(SSL *s, unsigned int context)
{
if (s->server)
s->tlsext_status_type = -1;
return 1;
}
#ifndef OPENSSL_NO_NEXTPROTONEG
static int tls_ext_init_npn(SSL *s, unsigned int context)
{
if (s->server)
s->s3->next_proto_neg_seen = 0;
return 1;
}
#endif
static int tls_ext_init_alpn(SSL *s, unsigned int context)
{
if (s->server) {
OPENSSL_free(s->s3->alpn_selected);
s->s3->alpn_selected = NULL;
s->s3->alpn_selected_len = 0;
OPENSSL_free(s->s3->alpn_proposed);
s->s3->alpn_proposed = NULL;
s->s3->alpn_proposed_len = 0;
}
return 1;
}
static int tls_ext_init_sig_algs(SSL *s, unsigned int context)
{
/* Clear any signature algorithms extension received */
OPENSSL_free(s->s3->tmp.peer_sigalgs);
s->s3->tmp.peer_sigalgs = NULL;
return 1;
}
#ifndef OPENSSL_NO_SRP
static int tls_ext_init_srp(SSL *s, unsigned int context)
{
OPENSSL_free(s->srp_ctx.login);
s->srp_ctx.login = NULL;
return 1;
}
#endif
static int tls_ext_init_etm(SSL *s, unsigned int context)
{
if (s->server)
s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
return 1;
}
#ifndef OPENSSL_NO_SRTP
static int tls_ext_init_srtp(SSL *s, unsigned int context)
{
if (s->server)
s->srtp_profile = NULL;
return 1;
}
#endif

108
ssl/statem/extensions_srvr.c
View file

@ -648,71 +648,6 @@ int tls_parse_client_ems(SSL *s, PACKET *pkt, int *al)
return 1;
}
#ifndef OPENSSL_NO_EC
/*-
* ssl_check_for_safari attempts to fingerprint Safari using OS X
* SecureTransport using the TLS extension block in |hello|.
* Safari, since 10.6, sends exactly these extensions, in this order:
* SNI,
* elliptic_curves
* ec_point_formats
*
* We wish to fingerprint Safari because they broke ECDHE-ECDSA support in 10.8,
* but they advertise support. So enabling ECDHE-ECDSA ciphers breaks them.
* Sadly we cannot differentiate 10.6, 10.7 and 10.8.4 (which work), from
* 10.8..10.8.3 (which don't work).
*/
static void ssl_check_for_safari(SSL *s, const CLIENTHELLO_MSG *hello)
{
unsigned int type;
PACKET sni, tmppkt;
size_t ext_len;
static const unsigned char kSafariExtensionsBlock[] = {
0x00, 0x0a, /* elliptic_curves extension */
0x00, 0x08, /* 8 bytes */
0x00, 0x06, /* 6 bytes of curve ids */
0x00, 0x17, /* P-256 */
0x00, 0x18, /* P-384 */
0x00, 0x19, /* P-521 */
0x00, 0x0b, /* ec_point_formats */
0x00, 0x02, /* 2 bytes */
0x01, /* 1 point format */
0x00, /* uncompressed */
/* The following is only present in TLS 1.2 */
0x00, 0x0d, /* signature_algorithms */
0x00, 0x0c, /* 12 bytes */
0x00, 0x0a, /* 10 bytes */
0x05, 0x01, /* SHA-384/RSA */
0x04, 0x01, /* SHA-256/RSA */
0x02, 0x01, /* SHA-1/RSA */
0x04, 0x03, /* SHA-256/ECDSA */
0x02, 0x03, /* SHA-1/ECDSA */
};
/* Length of the common prefix (first two extensions). */
static const size_t kSafariCommonExtensionsLength = 18;
tmppkt = hello->extensions;
if (!PACKET_forward(&tmppkt, 2)
|| !PACKET_get_net_2(&tmppkt, &type)
|| !PACKET_get_length_prefixed_2(&tmppkt, &sni)) {
return;
}
if (type != TLSEXT_TYPE_server_name)
return;
ext_len = TLS1_get_client_version(s) >= TLS1_2_VERSION ?
sizeof(kSafariExtensionsBlock) : kSafariCommonExtensionsLength;
s->s3->is_probably_safari = PACKET_equal(&tmppkt, kSafariExtensionsBlock,
ext_len);
}
#endif /* !OPENSSL_NO_EC */
/*
* Process all remaining ClientHello extensions that we collected earlier and
* haven't already processed.
@ -724,37 +659,6 @@ static void ssl_check_for_safari(SSL *s, const CLIENTHELLO_MSG *hello)
*/
int tls_scan_clienthello_tlsext(SSL *s, CLIENTHELLO_MSG *hello, int *al)
{
/* Reset various flags that might get set by extensions during parsing */
s->servername_done = 0;
s->tlsext_status_type = -1;
#ifndef OPENSSL_NO_NEXTPROTONEG
s->s3->next_proto_neg_seen = 0;
#endif
OPENSSL_free(s->s3->alpn_selected);
s->s3->alpn_selected = NULL;
s->s3->alpn_selected_len = 0;
OPENSSL_free(s->s3->alpn_proposed);
s->s3->alpn_proposed = NULL;
s->s3->alpn_proposed_len = 0;
#ifndef OPENSSL_NO_EC
if (s->options & SSL_OP_SAFARI_ECDHE_ECDSA_BUG)
ssl_check_for_safari(s, hello);
#endif /* !OPENSSL_NO_EC */
/* Clear any signature algorithms extension received */
OPENSSL_free(s->s3->tmp.peer_sigalgs);
s->s3->tmp.peer_sigalgs = NULL;
s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
#ifndef OPENSSL_NO_SRP
OPENSSL_free(s->srp_ctx.login);
s->srp_ctx.login = NULL;
#endif
s->srtp_profile = NULL;
/*
* We process the supported_groups extension first so that is done before
* we get to key_share which needs to use the information in it.
@ -764,18 +668,6 @@ int tls_scan_clienthello_tlsext(SSL *s, CLIENTHELLO_MSG *hello, int *al)
return 0;
}
/* Need RI if renegotiating */
if (s->renegotiate
&& !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)
&& tls_get_extension_by_type(hello->pre_proc_exts,
hello->num_extensions,
TLSEXT_TYPE_renegotiate) == NULL) {
*al = SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_TLS_SCAN_CLIENTHELLO_TLSEXT,
SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
return 0;
}
return tls_parse_all_extensions(s, EXT_CLIENT_HELLO, hello->pre_proc_exts,
hello->num_extensions, al);
}

112
ssl/statem/statem_srvr.c
View file

@ -1062,41 +1062,6 @@ int dtls_construct_hello_verify_request(SSL *s, WPACKET *pkt)
return 1;
}
/*
* Check the results of extension parsing. Currently just calls the servername
* callback. Returns 1 for success or 0 for failure.
*/
static int tls_check_clienthello_tlsext(SSL *s)
{
int ret = SSL_TLSEXT_ERR_NOACK;
int al = SSL_AD_UNRECOGNIZED_NAME;
if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
ret = s->ctx->tlsext_servername_callback(s, &al,
s->ctx->tlsext_servername_arg);
else if (s->initial_ctx != NULL
&& s->initial_ctx->tlsext_servername_callback != 0)
ret = s->initial_ctx->tlsext_servername_callback(s, &al,
s->initial_ctx->tlsext_servername_arg);
switch (ret) {
case SSL_TLSEXT_ERR_ALERT_FATAL:
ssl3_send_alert(s, SSL3_AL_FATAL, al);
return 0;
case SSL_TLSEXT_ERR_ALERT_WARNING:
ssl3_send_alert(s, SSL3_AL_WARNING, al);
return 1;
case SSL_TLSEXT_ERR_NOACK:
s->servername_done = 0;
return 1;
default:
return 1;
}
}
/*
* Parse the extensions in the ClientHello that were collected earlier. Returns
* 1 for success or 0 for failure.
@ -1105,21 +1070,81 @@ static int tls_parse_clienthello_tlsext(SSL *s, CLIENTHELLO_MSG *hello)
{
int al = -1;
custom_ext_init(&s->cert->srv_ext);
if (tls_scan_clienthello_tlsext(s, hello, &al) <= 0) {
ssl3_send_alert(s, SSL3_AL_FATAL, al);
return 0;
}
if (!tls_check_clienthello_tlsext(s)) {
SSLerr(SSL_F_TLS_PARSE_CLIENTHELLO_TLSEXT, SSL_R_CLIENTHELLO_TLSEXT);
return 0;
}
return 1;
}
#ifndef OPENSSL_NO_EC
/*-
* ssl_check_for_safari attempts to fingerprint Safari using OS X
* SecureTransport using the TLS extension block in |hello|.
* Safari, since 10.6, sends exactly these extensions, in this order:
* SNI,
* elliptic_curves
* ec_point_formats
*
* We wish to fingerprint Safari because they broke ECDHE-ECDSA support in 10.8,
* but they advertise support. So enabling ECDHE-ECDSA ciphers breaks them.
* Sadly we cannot differentiate 10.6, 10.7 and 10.8.4 (which work), from
* 10.8..10.8.3 (which don't work).
*/
static void ssl_check_for_safari(SSL *s, const CLIENTHELLO_MSG *hello)
{
unsigned int type;
PACKET sni, tmppkt;
size_t ext_len;
static const unsigned char kSafariExtensionsBlock[] = {
0x00, 0x0a, /* elliptic_curves extension */
0x00, 0x08, /* 8 bytes */
0x00, 0x06, /* 6 bytes of curve ids */
0x00, 0x17, /* P-256 */
0x00, 0x18, /* P-384 */
0x00, 0x19, /* P-521 */
0x00, 0x0b, /* ec_point_formats */
0x00, 0x02, /* 2 bytes */
0x01, /* 1 point format */
0x00, /* uncompressed */
/* The following is only present in TLS 1.2 */
0x00, 0x0d, /* signature_algorithms */
0x00, 0x0c, /* 12 bytes */
0x00, 0x0a, /* 10 bytes */
0x05, 0x01, /* SHA-384/RSA */
0x04, 0x01, /* SHA-256/RSA */
0x02, 0x01, /* SHA-1/RSA */
0x04, 0x03, /* SHA-256/ECDSA */
0x02, 0x03, /* SHA-1/ECDSA */
};
/* Length of the common prefix (first two extensions). */
static const size_t kSafariCommonExtensionsLength = 18;
tmppkt = hello->extensions;
if (!PACKET_forward(&tmppkt, 2)
|| !PACKET_get_net_2(&tmppkt, &type)
|| !PACKET_get_length_prefixed_2(&tmppkt, &sni)) {
return;
}
if (type != TLSEXT_TYPE_server_name)
return;
ext_len = TLS1_get_client_version(s) >= TLS1_2_VERSION ?
sizeof(kSafariExtensionsBlock) : kSafariCommonExtensionsLength;
s->s3->is_probably_safari = PACKET_equal(&tmppkt, kSafariExtensionsBlock,
ext_len);
}
#endif /* !OPENSSL_NO_EC */
MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt)
{
int i, al = SSL_AD_INTERNAL_ERROR;
@ -1494,6 +1519,11 @@ MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt)
goto f_err;
}
#ifndef OPENSSL_NO_EC
if (s->options & SSL_OP_SAFARI_ECDHE_ECDSA_BUG)
ssl_check_for_safari(s, &clienthello);
#endif /* !OPENSSL_NO_EC */
/* TLS extensions */
if (!tls_parse_clienthello_tlsext(s, &clienthello)) {
SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_PARSE_TLSEXT);