Move 'shared_sigalgs' from cert_st to ssl_st

It was only ever in cert_st because ssl_st was a public structure
and could not be modified without breaking the API.  However, both
structures are now opaque, and thus we can freely change their layout
without breaking applications.  In this case, keeping the shared
sigalgs in the SSL object prevents complications wherein they would
inadvertently get cleared during SSL_set_SSL_CTX() (e.g., as run
during a cert_cb).

Fixes #9099

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/9157)

diff --git a/ssl/ssl_cert.c b/ssl/ssl_cert.c
index 04963f1b7312d50cef7cce580f91a3c5319228db..5538e4da249c113cbb025b53b398c853d8774f1e 100644 (file)
--- a/ssl/ssl_cert.c
+++ b/ssl/ssl_cert.c
@@ -154,8 +154,6 @@ CERT *ssl_cert_dup(CERT *cert)
         ret->client_sigalgslen = cert->client_sigalgslen;
     } else
         ret->client_sigalgs = NULL;
-    /* Shared sigalgs also NULL */
-    ret->shared_sigalgs = NULL;
     /* Copy any custom client certificate types */
     if (cert->ctype) {
         ret->ctype = OPENSSL_memdup(cert->ctype, cert->ctype_len);
@@ -240,7 +238,6 @@ void ssl_cert_free(CERT *c)
     ssl_cert_clear_certs(c);
     OPENSSL_free(c->conf_sigalgs);
     OPENSSL_free(c->client_sigalgs);
-    OPENSSL_free(c->shared_sigalgs);
     OPENSSL_free(c->ctype);
     X509_STORE_free(c->verify_store);
     X509_STORE_free(c->chain_store);

diff --git a/ssl/ssl_lib.c b/ssl/ssl_lib.c
index d15b743f5096b38d3bb63f1e151272a331820866..211a82898133ef8b15f493484ef4d5d3e65dd6f9 100644 (file)
--- a/ssl/ssl_lib.c
+++ b/ssl/ssl_lib.c
@@ -629,6 +629,11 @@ int SSL_clear(SSL *s)
     /* Clear the verification result peername */
     X509_VERIFY_PARAM_move_peername(s->param, NULL);
 
+    /* Clear any shared connection state */
+    OPENSSL_free(s->shared_sigalgs);
+    s->shared_sigalgs = NULL;
+    s->shared_sigalgslen = 0;
+
     /*
      * Check to see if we were changed into a different method, if so, revert
      * back.
@@ -1182,6 +1187,7 @@ void SSL_free(SSL *s)
     clear_ciphers(s);
 
     ssl_cert_free(s->cert);
+    OPENSSL_free(s->shared_sigalgs);
     /* Free up if allocated */
 
     OPENSSL_free(s->ext.hostname);

diff --git a/ssl/ssl_locl.h b/ssl/ssl_locl.h
index a61987f327b671a399a07454e7902ca2c021f105..269f542f2aee245ceed6d6236f3fff03f6311e1f 100644 (file)
--- a/ssl/ssl_locl.h
+++ b/ssl/ssl_locl.h
@@ -1661,6 +1661,13 @@ struct ssl_st {
     /* Callback for SSL async handling */
     SSL_async_callback_fn async_cb;
     void *async_cb_arg;
+
+    /*
+     * Signature algorithms shared by client and server: cached because these
+     * are used most often.
+     */
+    const struct sigalg_lookup_st **shared_sigalgs;
+    size_t shared_sigalgslen;
 };
 
 /*
@@ -1925,12 +1932,6 @@ typedef struct cert_st {
     uint16_t *client_sigalgs;
     /* Size of above array */
     size_t client_sigalgslen;
-    /*
-     * Signature algorithms shared by client and server: cached because these
-     * are used most often.
-     */
-    const SIGALG_LOOKUP **shared_sigalgs;
-    size_t shared_sigalgslen;
     /*
      * Certificate setup callback: if set is called whenever a certificate
      * may be required (client or server). the callback can then examine any

diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c
index 95622de0cd63a41bbd990080e7fbc4b4f24f6145..05c4ba54733dcea5c8a5fddf57bf883a2d6b76ea 100644 (file)
--- a/ssl/t1_lib.c
+++ b/ssl/t1_lib.c
@@ -650,7 +650,6 @@ static int tls1_check_cert_param(SSL *s, X509 *x, int check_ee_md)
     if (check_ee_md && tls1_suiteb(s)) {
         int check_md;
         size_t i;
-        CERT *c = s->cert;
 
         /* Check to see we have necessary signing algorithm */
         if (group_id == TLSEXT_curve_P_256)
@@ -659,8 +658,8 @@ static int tls1_check_cert_param(SSL *s, X509 *x, int check_ee_md)
             check_md = NID_ecdsa_with_SHA384;
         else
             return 0;           /* Should never happen */
-        for (i = 0; i < c->shared_sigalgslen; i++) {
-            if (check_md == c->shared_sigalgs[i]->sigandhash)
+        for (i = 0; i < s->shared_sigalgslen; i++) {
+            if (check_md == s->shared_sigalgs[i]->sigandhash)
                 return 1;;
         }
         return 0;
@@ -1287,9 +1286,9 @@ int tls1_set_server_sigalgs(SSL *s)
     size_t i;
 
     /* Clear any shared signature algorithms */
-    OPENSSL_free(s->cert->shared_sigalgs);
-    s->cert->shared_sigalgs = NULL;
-    s->cert->shared_sigalgslen = 0;
+    OPENSSL_free(s->shared_sigalgs);
+    s->shared_sigalgs = NULL;
+    s->shared_sigalgslen = 0;
     /* Clear certificate validity flags */
     for (i = 0; i < SSL_PKEY_NUM; i++)
         s->s3.tmp.valid_flags[i] = 0;
@@ -1324,7 +1323,7 @@ int tls1_set_server_sigalgs(SSL *s)
                  SSL_F_TLS1_SET_SERVER_SIGALGS, ERR_R_INTERNAL_ERROR);
         return 0;
     }
-    if (s->cert->shared_sigalgs != NULL)
+    if (s->shared_sigalgs != NULL)
         return 1;
 
     /* Fatal error if no shared signature algorithms */
@@ -1796,9 +1795,9 @@ static int tls1_set_shared_sigalgs(SSL *s)
     CERT *c = s->cert;
     unsigned int is_suiteb = tls1_suiteb(s);
 
-    OPENSSL_free(c->shared_sigalgs);
-    c->shared_sigalgs = NULL;
-    c->shared_sigalgslen = 0;
+    OPENSSL_free(s->shared_sigalgs);
+    s->shared_sigalgs = NULL;
+    s->shared_sigalgslen = 0;
     /* If client use client signature algorithms if not NULL */
     if (!s->server && c->client_sigalgs && !is_suiteb) {
         conf = c->client_sigalgs;
@@ -1829,8 +1828,8 @@ static int tls1_set_shared_sigalgs(SSL *s)
     } else {
         salgs = NULL;
     }
-    c->shared_sigalgs = salgs;
-    c->shared_sigalgslen = nmatch;
+    s->shared_sigalgs = salgs;
+    s->shared_sigalgslen = nmatch;
     return 1;
 }
 
@@ -1891,7 +1890,6 @@ int tls1_process_sigalgs(SSL *s)
 {
     size_t i;
     uint32_t *pvalid = s->s3.tmp.valid_flags;
-    CERT *c = s->cert;
 
     if (!tls1_set_shared_sigalgs(s))
         return 0;
@@ -1899,8 +1897,8 @@ int tls1_process_sigalgs(SSL *s)
     for (i = 0; i < SSL_PKEY_NUM; i++)
         pvalid[i] = 0;
 
-    for (i = 0; i < c->shared_sigalgslen; i++) {
-        const SIGALG_LOOKUP *sigptr = c->shared_sigalgs[i];
+    for (i = 0; i < s->shared_sigalgslen; i++) {
+        const SIGALG_LOOKUP *sigptr = s->shared_sigalgs[i];
         int idx = sigptr->sig_idx;
 
         /* Ignore PKCS1 based sig algs in TLSv1.3 */
@@ -1947,12 +1945,12 @@ int SSL_get_shared_sigalgs(SSL *s, int idx,
                            unsigned char *rsig, unsigned char *rhash)
 {
     const SIGALG_LOOKUP *shsigalgs;
-    if (s->cert->shared_sigalgs == NULL
+    if (s->shared_sigalgs == NULL
         || idx < 0
-        || idx >= (int)s->cert->shared_sigalgslen
-        || s->cert->shared_sigalgslen > INT_MAX)
+        || idx >= (int)s->shared_sigalgslen
+        || s->shared_sigalgslen > INT_MAX)
         return 0;
-    shsigalgs = s->cert->shared_sigalgs[idx];
+    shsigalgs = s->shared_sigalgs[idx];
     if (phash != NULL)
         *phash = shsigalgs->hash;
     if (psign != NULL)
@@ -1963,7 +1961,7 @@ int SSL_get_shared_sigalgs(SSL *s, int idx,
         *rsig = (unsigned char)(shsigalgs->sigalg & 0xff);
     if (rhash != NULL)
         *rhash = (unsigned char)((shsigalgs->sigalg >> 8) & 0xff);
-    return (int)s->cert->shared_sigalgslen;
+    return (int)s->shared_sigalgslen;
 }
 
 /* Maximum possible number of unique entries in sigalgs array */
@@ -2144,7 +2142,7 @@ int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client)
     return 0;
 }
 
-static int tls1_check_sig_alg(CERT *c, X509 *x, int default_nid)
+static int tls1_check_sig_alg(SSL *s, X509 *x, int default_nid)
 {
     int sig_nid;
     size_t i;
@@ -2153,8 +2151,8 @@ static int tls1_check_sig_alg(CERT *c, X509 *x, int default_nid)
     sig_nid = X509_get_signature_nid(x);
     if (default_nid)
         return sig_nid == default_nid ? 1 : 0;
-    for (i = 0; i < c->shared_sigalgslen; i++)
-        if (sig_nid == c->shared_sigalgs[i]->sigandhash)
+    for (i = 0; i < s->shared_sigalgslen; i++)
+        if (sig_nid == s->shared_sigalgs[i]->sigandhash)
             return 1;
     return 0;
 }
@@ -2312,14 +2310,14 @@ int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain,
             }
         }
         /* Check signature algorithm of each cert in chain */
-        if (!tls1_check_sig_alg(c, x, default_nid)) {
+        if (!tls1_check_sig_alg(s, x, default_nid)) {
             if (!check_flags)
                 goto end;
         } else
             rv |= CERT_PKEY_EE_SIGNATURE;
         rv |= CERT_PKEY_CA_SIGNATURE;
         for (i = 0; i < sk_X509_num(chain); i++) {
-            if (!tls1_check_sig_alg(c, sk_X509_value(chain, i), default_nid)) {
+            if (!tls1_check_sig_alg(s, sk_X509_value(chain, i), default_nid)) {
                 if (check_flags) {
                     rv &= ~CERT_PKEY_CA_SIGNATURE;
                     break;
@@ -2684,8 +2682,8 @@ int tls_choose_sigalg(SSL *s, int fatalerrs)
 #endif
 
         /* Look for a certificate matching shared sigalgs */
-        for (i = 0; i < s->cert->shared_sigalgslen; i++) {
-            lu = s->cert->shared_sigalgs[i];
+        for (i = 0; i < s->shared_sigalgslen; i++) {
+            lu = s->shared_sigalgs[i];
             sig_idx = -1;
 
             /* Skip SHA1, SHA224, DSA and RSA if not PSS */
@@ -2719,7 +2717,7 @@ int tls_choose_sigalg(SSL *s, int fatalerrs)
             }
             break;
         }
-        if (i == s->cert->shared_sigalgslen) {
+        if (i == s->shared_sigalgslen) {
             if (!fatalerrs)
                 return 1;
             SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_F_TLS_CHOOSE_SIGALG,
@@ -2752,8 +2750,8 @@ int tls_choose_sigalg(SSL *s, int fatalerrs)
                  * Find highest preference signature algorithm matching
                  * cert type
                  */
-                for (i = 0; i < s->cert->shared_sigalgslen; i++) {
-                    lu = s->cert->shared_sigalgs[i];
+                for (i = 0; i < s->shared_sigalgslen; i++) {
+                    lu = s->shared_sigalgs[i];
 
                     if (s->server) {
                         if ((sig_idx = tls12_get_cert_sigalg_idx(s, lu)) == -1)
@@ -2780,7 +2778,7 @@ int tls_choose_sigalg(SSL *s, int fatalerrs)
 #endif
                         break;
                 }
-                if (i == s->cert->shared_sigalgslen) {
+                if (i == s->shared_sigalgslen) {
                     if (!fatalerrs)
                         return 1;
                     SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,