Use CERT_PKEY pointer instead of index

Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2623)

ssl/s3_lib.c

@@ -3149,9 +3149,9 @@ long ssl3_ctrl(SSL *s, int cmd, long larg, void *parg)
              */
             if (cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP))
                 return 2;
-            if (s->s3->tmp.cert_idx == -1)
+            if (s->s3->tmp.cert == NULL)
                 return 0;
-            s->cert->key = &s->cert->pkeys[s->s3->tmp.cert_idx];
+            s->cert->key = s->s3->tmp.cert;
             return 1;
         }
         return ssl_cert_set_current(s->cert, larg);

ssl/ssl_lib.c

@@ -2836,20 +2836,14 @@ int ssl_check_srvr_ecc_cert_and_alg(X509 *x, SSL *s)
 int ssl_get_server_cert_serverinfo(SSL *s, const unsigned char **serverinfo,
                                    size_t *serverinfo_length)
 {
-    CERT *c = NULL;
-    int i = 0;
+    CERT_PKEY *cpk = s->s3->tmp.cert;
     *serverinfo_length = 0;
 
-    c = s->cert;
-    i = s->s3->tmp.cert_idx;
-
-    if (i == -1)
-        return 0;
-    if (c->pkeys[i].serverinfo == NULL)
+    if (cpk == NULL || cpk->serverinfo == NULL)
         return 0;
 
-    *serverinfo = c->pkeys[i].serverinfo;
-    *serverinfo_length = c->pkeys[i].serverinfo_length;
+    *serverinfo = cpk->serverinfo;
+    *serverinfo_length = cpk->serverinfo_length;
     return 1;
 }
 

ssl/ssl_locl.h

@@ -1213,6 +1213,8 @@ typedef struct sigalg_lookup_st {
     int curve;
 } SIGALG_LOOKUP;
 
+typedef struct cert_pkey_st CERT_PKEY;
+
 typedef struct ssl3_state_st {
     long flags;
     size_t read_mac_secret_size;
@@ -1296,8 +1298,8 @@ typedef struct ssl3_state_st {
 # endif
         /* Signature algorithm we actually use */
         const SIGALG_LOOKUP *sigalg;
-        /* Index of certificate we use */
-        int cert_idx;
+        /* Pointer to certificate we use */
+        CERT_PKEY *cert;
         /*
          * signature algorithms peer reports: e.g. supported signature
          * algorithms extension for server or as part of a certificate
@@ -1491,7 +1493,7 @@ typedef struct dtls1_state_st {
 #  define NAMED_CURVE_TYPE           3
 # endif                         /* OPENSSL_NO_EC */
 
-typedef struct cert_pkey_st {
+struct cert_pkey_st {
     X509 *x509;
     EVP_PKEY *privatekey;
     /* Chain for this certificate */
@@ -1505,7 +1507,7 @@ typedef struct cert_pkey_st {
      */
     unsigned char *serverinfo;
     size_t serverinfo_length;
-} CERT_PKEY;
+};
 /* Retrieve Suite B flags */
 # define tls1_suiteb(s)  (s->cert->cert_flags & SSL_CERT_FLAG_SUITEB_128_LOS)
 /* Uses to check strict mode: suite B modes are always strict */

ssl/statem/statem_srvr.c

@@ -1761,12 +1761,12 @@ static int tls_handle_status_request(SSL *s, int *al)
         int ret;
 
         /* If no certificate can't return certificate status */
-        if (s->s3->tmp.cert_idx != -1) {
+        if (s->s3->tmp.cert != NULL) {
             /*
              * Set current certificate to one we will use so SSL_get_certificate
              * et al can pick it up.
              */
-            s->cert->key = &s->cert->pkeys[s->s3->tmp.cert_idx];
+            s->cert->key = s->s3->tmp.cert;
             ret = s->ctx->ext.status_cb(s, s->ctx->ext.status_arg);
             switch (ret) {
                 /* We don't want to send a status request response */
@@ -2249,7 +2249,7 @@ int tls_construct_server_key_exchange(SSL *s, WPACKET *pkt)
 
     /* not anonymous */
     if (lu != NULL) {
-        EVP_PKEY *pkey = s->cert->pkeys[s->s3->tmp.cert_idx].privatekey;
+        EVP_PKEY *pkey = s->s3->tmp.cert->privatekey;
         const EVP_MD *md = ssl_md(lu->hash_idx);
         unsigned char *sigbytes1, *sigbytes2;
         size_t siglen;
@@ -3197,14 +3197,13 @@ MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt)
 
 int tls_construct_server_certificate(SSL *s, WPACKET *pkt)
 {
-    CERT_PKEY *cpk;
+    CERT_PKEY *cpk = s->s3->tmp.cert;
     int al = SSL_AD_INTERNAL_ERROR;
 
-    if (s->s3->tmp.cert_idx == -1) {
+    if (cpk == NULL) {
         SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
         return 0;
     }
-    cpk = &s->cert->pkeys[s->s3->tmp.cert_idx];
 
     /*
      * In TLSv1.3 the certificate chain is always preceded by a 0 length context

ssl/t1_lib.c

@@ -2201,11 +2201,9 @@ DH *ssl_get_auto_dh(SSL *s)
         else
             dh_secbits = 80;
     } else {
-        CERT_PKEY *cpk;
-        if (s->s3->tmp.cert_idx == -1)
+        if (s->s3->tmp.cert == NULL)
             return NULL;
-        cpk = &s->cert->pkeys[s->s3->tmp.cert_idx];
-        dh_secbits = EVP_PKEY_security_bits(cpk->privatekey);
+        dh_secbits = EVP_PKEY_security_bits(s->s3->tmp.cert->privatekey);
     }
 
     if (dh_secbits >= 128) {
@@ -2369,7 +2367,7 @@ int tls_choose_sigalg(SSL *s, int *al)
         idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
         /* If no certificate for ciphersuite return */
         if (idx == -1) {
-            s->s3->tmp.cert_idx = -1;
+            s->s3->tmp.cert = NULL;
             s->s3->tmp.sigalg = NULL;
             return 1;
         }
@@ -2445,7 +2443,7 @@ int tls_choose_sigalg(SSL *s, int *al)
             }
         }
     }
-    s->s3->tmp.cert_idx = idx;
+    s->s3->tmp.cert = &s->cert->pkeys[idx];
     s->s3->tmp.sigalg = lu;
     return 1;
 }