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Process signature algorithms in ClientHello late.

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Reviewed-by: Tim Hudson <tjh@openssl.org>
This commit is contained in:
Dr. Stephen Henson 2014-10-09 20:37:27 +01:00
parent 3ff08e1dde
commit c800c27a8c
5 changed files with 62 additions and 35 deletions
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8
ssl/s3_clnt.c
View File

@ -2191,12 +2191,18 @@ int ssl3_get_certificate_request(SSL *s)
s->cert->pkeys[i].digest = NULL;
s->cert->pkeys[i].valid_flags = 0;
}
if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
if ((llen & 1) || !tls1_save_sigalgs(s, p, llen))
{
ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
goto err;
}
if (!tls1_process_sigalgs(s))
{
ssl3_send_alert(s,SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
goto err;
}
p += llen;
}

1
ssl/ssl.h
View File

@ -2682,6 +2682,7 @@ void ERR_load_SSL_strings(void);
#define SSL_F_SSL_CERT_INSTANTIATE 214
#define SSL_F_SSL_CERT_NEW 162
#define SSL_F_SSL_CERT_SET0_CHAIN 340
#define SSL_F_SSL_CHECK_CLIENTHELLO_TLSEXT_LATE 335
#define SSL_F_SSL_CHECK_PRIVATE_KEY 163
#define SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT 280
#define SSL_F_SSL_CHECK_SRVR_ECC_CERT_AND_ALG 279

1
ssl/ssl_err.c
View File

@ -201,6 +201,7 @@ static ERR_STRING_DATA SSL_str_functs[]=
{ERR_FUNC(SSL_F_SSL_CERT_INSTANTIATE), "SSL_CERT_INSTANTIATE"},
{ERR_FUNC(SSL_F_SSL_CERT_NEW), "ssl_cert_new"},
{ERR_FUNC(SSL_F_SSL_CERT_SET0_CHAIN), "ssl_cert_set0_chain"},
{ERR_FUNC(SSL_F_SSL_CHECK_CLIENTHELLO_TLSEXT_LATE), "ssl_check_clienthello_tlsext_late"},
{ERR_FUNC(SSL_F_SSL_CHECK_PRIVATE_KEY), "SSL_check_private_key"},
{ERR_FUNC(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT), "SSL_CHECK_SERVERHELLO_TLSEXT"},
{ERR_FUNC(SSL_F_SSL_CHECK_SRVR_ECC_CERT_AND_ALG), "ssl_check_srvr_ecc_cert_and_alg"},

3
ssl/ssl_locl.h
View File

@ -1382,7 +1382,8 @@ int ssl_parse_clienthello_renegotiate_ext(SSL *s, unsigned char *d, int len,
long ssl_get_algorithm2(SSL *s);
size_t tls12_copy_sigalgs(SSL *s, unsigned char *out,
const unsigned char *psig, size_t psiglen);
int tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize);
int tls1_save_sigalgs(SSL *s, const unsigned char *data, int dsize);
int tls1_process_sigalgs(SSL *s);
size_t tls12_get_psigalgs(SSL *s, const unsigned char **psigs);
int tls12_check_peer_sigalg(const EVP_MD **pmd, SSL *s,
const unsigned char *sig, EVP_PKEY *pkey);

84
ssl/t1_lib.c
View File

@ -1920,7 +1920,6 @@ static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char
unsigned short len;
unsigned char *data = *p;
int renegotiate_seen = 0;
size_t i;
s->servername_done = 0;
s->tlsext_status_type = -1;
@ -1950,18 +1949,6 @@ static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char
OPENSSL_free(s->cert->peer_sigalgs);
s->cert->peer_sigalgs = NULL;
}
/* Clear any shared sigtnature algorithms */
if (s->cert->shared_sigalgs)
{
OPENSSL_free(s->cert->shared_sigalgs);
s->cert->shared_sigalgs = NULL;
}
/* Clear certificate digests and validity flags */
for (i = 0; i < SSL_PKEY_NUM; i++)
{
s->cert->pkeys[i].digest = NULL;
s->cert->pkeys[i].valid_flags = 0;
}
#ifdef TLSEXT_TYPE_encrypt_then_mac
s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
@ -2252,21 +2239,11 @@ static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char
*al = SSL_AD_DECODE_ERROR;
return 0;
}
if (!tls1_process_sigalgs(s, data, dsize))
if (!tls1_save_sigalgs(s, data, dsize))
{
*al = SSL_AD_DECODE_ERROR;
return 0;
}
/* If sigalgs received and no shared algorithms fatal
* error.
*/
if (s->cert->peer_sigalgs && !s->cert->shared_sigalgs)
{
SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
SSL_R_NO_SHARED_SIGATURE_ALGORITHMS);
*al = SSL_AD_ILLEGAL_PARAMETER;
return 0;
}
}
else if (type == TLSEXT_TYPE_status_request)
{
@ -2476,9 +2453,6 @@ static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char
SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
return 0;
}
/* If no signature algorithms extension set default values */
if (!s->cert->peer_sigalgs)
ssl_cert_set_default_md(s->cert);
return 1;
}
@ -2998,6 +2972,7 @@ int ssl_check_clienthello_tlsext_late(SSL *s)
{
int ret = SSL_TLSEXT_ERR_OK;
int al;
size_t i;
/* If status request then ask callback what to do.
* Note: this must be called after servername callbacks in case
@ -3043,6 +3018,43 @@ int ssl_check_clienthello_tlsext_late(SSL *s)
else
s->tlsext_status_expected = 0;
/* Clear any shared sigtnature algorithms */
if (s->cert->shared_sigalgs)
{
OPENSSL_free(s->cert->shared_sigalgs);
s->cert->shared_sigalgs = NULL;
}
/* Clear certificate digests and validity flags */
for (i = 0; i < SSL_PKEY_NUM; i++)
{
s->cert->pkeys[i].digest = NULL;
s->cert->pkeys[i].valid_flags = 0;
}
/* If sigalgs received process it. */
if (s->cert->peer_sigalgs)
{
if (!tls1_process_sigalgs(s))
{
SSLerr(SSL_F_SSL_CHECK_CLIENTHELLO_TLSEXT_LATE,
ERR_R_MALLOC_FAILURE);
ret = SSL_TLSEXT_ERR_ALERT_FATAL;
al = SSL_AD_INTERNAL_ERROR;
goto err;
}
/* Fatal error is no shared signature algorithms */
if (!s->cert->shared_sigalgs)
{
SSLerr(SSL_F_SSL_CHECK_CLIENTHELLO_TLSEXT_LATE,
SSL_R_NO_SHARED_SIGATURE_ALGORITHMS);
ret = SSL_TLSEXT_ERR_ALERT_FATAL;
al = SSL_AD_ILLEGAL_PARAMETER;
goto err;
}
}
else
ssl_cert_set_default_md(s->cert);
err:
switch (ret)
{
@ -3771,13 +3783,9 @@ static int tls1_set_shared_sigalgs(SSL *s)
/* Set preferred digest for each key type */
int tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize)
int tls1_save_sigalgs(SSL *s, const unsigned char *data, int dsize)
{
int idx;
size_t i;
const EVP_MD *md;
CERT *c = s->cert;
TLS_SIGALGS *sigptr;
/* Extension ignored for inappropriate versions */
if (!SSL_USE_SIGALGS(s))
return 1;
@ -3792,8 +3800,18 @@ int tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize)
return 0;
c->peer_sigalgslen = dsize;
memcpy(c->peer_sigalgs, data, dsize);
return 1;
}
tls1_set_shared_sigalgs(s);
int tls1_process_sigalgs(SSL *s)
{
int idx;
size_t i;
const EVP_MD *md;
CERT *c = s->cert;
TLS_SIGALGS *sigptr;
if (!tls1_set_shared_sigalgs(s))
return 0;
#ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)