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Use correct signature algorithm list when sending or checking.

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Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2290)
This commit is contained in:
Dr. Stephen Henson 2017-01-25 19:12:48 +00:00
parent 536454e53b
commit a9669ddc64
4 changed files with 13 additions and 10 deletions
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2
ssl/ssl_locl.h
View File

@ -2188,7 +2188,7 @@ __owur int tls12_copy_sigalgs(SSL *s, WPACKET *pkt,
const unsigned int *psig, size_t psiglen);
__owur int tls1_save_sigalgs(SSL *s, PACKET *pkt);
__owur int tls1_process_sigalgs(SSL *s);
__owur size_t tls12_get_psigalgs(SSL *s, const unsigned int **psigs);
__owur size_t tls12_get_psigalgs(SSL *s, int sent, const unsigned int **psigs);
__owur int tls12_check_peer_sigalg(const EVP_MD **pmd, SSL *s, unsigned int sig,
EVP_PKEY *pkey);
void ssl_set_client_disabled(SSL *s);

2
ssl/statem/extensions_clnt.c
View File

@ -231,7 +231,7 @@ int tls_construct_ctos_sig_algs(SSL *s, WPACKET *pkt, X509 *x, size_t chainidx,
if (!SSL_CLIENT_USE_SIGALGS(s))
return 1;
salglen = tls12_get_psigalgs(s, &salg);
salglen = tls12_get_psigalgs(s, 1, &salg);
if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_signature_algorithms)
/* Sub-packet for sig-algs extension */
|| !WPACKET_start_sub_packet_u16(pkt)

2
ssl/statem/statem_srvr.c
View File

@ -2310,7 +2310,7 @@ int tls_construct_certificate_request(SSL *s, WPACKET *pkt)
if (SSL_USE_SIGALGS(s)) {
const unsigned int *psigs;
size_t nl = tls12_get_psigalgs(s, &psigs);
size_t nl = tls12_get_psigalgs(s, 1, &psigs);
if (!WPACKET_start_sub_packet_u16(pkt)
|| !tls12_copy_sigalgs(s, pkt, psigs, nl)

17
ssl/t1_lib.c
View File

@ -773,8 +773,7 @@ static int tls_sigalg_get_sig(unsigned int sigalg)
return 0;
}
size_t tls12_get_psigalgs(SSL *s, const unsigned int **psigs)
size_t tls12_get_psigalgs(SSL *s, int sent, const unsigned int **psigs)
{
/*
* If Suite B mode use Suite B sigalgs only, ignore any other
@ -795,8 +794,12 @@ size_t tls12_get_psigalgs(SSL *s, const unsigned int **psigs)
return 1;
}
#endif
/* If server use client authentication sigalgs if not NULL */
if (s->server && s->cert->client_sigalgs) {
/*
* We use client_sigalgs (if not NULL) if we're a server
* and sending a certificate request or if we're a client and
* determining which shared algorithm to use.
*/
if ((s->server == sent) && s->cert->client_sigalgs != NULL) {
*psigs = s->cert->client_sigalgs;
return s->cert->client_sigalgslen;
} else if (s->cert->conf_sigalgs) {
@ -861,7 +864,7 @@ int tls12_check_peer_sigalg(const EVP_MD **pmd, SSL *s, unsigned int sig,
#endif
/* Check signature matches a type we sent */
sent_sigslen = tls12_get_psigalgs(s, &sent_sigs);
sent_sigslen = tls12_get_psigalgs(s, 1, &sent_sigs);
for (i = 0; i < sent_sigslen; i++, sent_sigs++) {
if (sig == *sent_sigs)
break;
@ -1429,7 +1432,7 @@ void ssl_set_sig_mask(uint32_t *pmask_a, SSL *s, int op)
* RSA, DSA, ECDSA. Do this for all versions not just TLS 1.2. To keep
* down calls to security callback only check if we have to.
*/
sigalgslen = tls12_get_psigalgs(s, &sigalgs);
sigalgslen = tls12_get_psigalgs(s, 1, &sigalgs);
for (i = 0; i < sigalgslen; i ++, sigalgs++) {
switch (tls_sigalg_get_sig(*sigalgs)) {
#ifndef OPENSSL_NO_RSA
@ -1523,7 +1526,7 @@ static int tls1_set_shared_sigalgs(SSL *s)
conf = c->conf_sigalgs;
conflen = c->conf_sigalgslen;
} else
conflen = tls12_get_psigalgs(s, &conf);
conflen = tls12_get_psigalgs(s, 0, &conf);
if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE || is_suiteb) {
pref = conf;
preflen = conflen;