Error out immediately on empty ciphers list.

[openssl.git] / ssl / s3_srvr.c

diff --git a/ssl/s3_srvr.c b/ssl/s3_srvr.c
index 68a8c812e037116ec2a3e80bd76d3c98d28193ff..6c1ba3ae48f6787c5fb7b087b03b8dcbd3fd0476 100644 (file)
--- a/ssl/s3_srvr.c
+++ b/ssl/s3_srvr.c
@@ -227,7 +227,7 @@ int ssl3_accept(SSL *s)
     /* init things to blank */
     s->in_handshake++;
     if (!SSL_in_init(s) || SSL_in_before(s)) {
-        if(!SSL_clear(s))
+        if (!SSL_clear(s))
             return -1;
     }
 
@@ -882,7 +882,7 @@ int ssl3_send_hello_request(SSL *s)
 {
 
     if (s->state == SSL3_ST_SW_HELLO_REQ_A) {
-        if(!ssl_set_handshake_header(s, SSL3_MT_HELLO_REQUEST, 0)) {
+        if (!ssl_set_handshake_header(s, SSL3_MT_HELLO_REQUEST, 0)) {
             SSLerr(SSL_F_SSL3_SEND_HELLO_REQUEST, ERR_R_INTERNAL_ERROR);
             return -1;
         }
@@ -931,6 +931,16 @@ int ssl3_get_client_hello(SSL *s)
     s->first_packet = 0;
     d = p = (unsigned char *)s->init_msg;
 
+    /*
+     * 2 bytes for client version, SSL3_RANDOM_SIZE bytes for random, 1 byte
+     * for session id length
+     */
+    if (n < 2 + SSL3_RANDOM_SIZE + 1) {
+        al = SSL_AD_DECODE_ERROR;
+        SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
+        goto f_err;
+    }
+
     /*
      * use version from inside client hello, not from record header (may
      * differ: see RFC 2246, Appendix E, second paragraph)
@@ -963,6 +973,12 @@ int ssl3_get_client_hello(SSL *s)
         unsigned int session_length, cookie_length;
 
         session_length = *(p + SSL3_RANDOM_SIZE);
+
+        if (p + SSL3_RANDOM_SIZE + session_length + 1 >= d + n) {
+            al = SSL_AD_DECODE_ERROR;
+            SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
+            goto f_err;
+        }
         cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 
         if (cookie_length == 0)
@@ -976,6 +992,12 @@ int ssl3_get_client_hello(SSL *s)
     /* get the session-id */
     j = *(p++);
 
+    if (p + j > d + n) {
+        al = SSL_AD_DECODE_ERROR;
+        SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
+        goto f_err;
+    }
+
     s->hit = 0;
     /*
      * Versions before 0.9.7 always allow clients to resume sessions in
@@ -1020,8 +1042,19 @@ int ssl3_get_client_hello(SSL *s)
 
     if (SSL_IS_DTLS(s)) {
         /* cookie stuff */
+        if (p + 1 > d + n) {
+            al = SSL_AD_DECODE_ERROR;
+            SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
+            goto f_err;
+        }
         cookie_len = *(p++);
 
+        if (p + cookie_len > d + n) {
+            al = SSL_AD_DECODE_ERROR;
+            SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
+            goto f_err;
+        }
+
         /*
          * The ClientHello may contain a cookie even if the
          * HelloVerify message has not been sent--make sure that it
@@ -1087,27 +1120,33 @@ int ssl3_get_client_hello(SSL *s)
         }
     }
 
+    if (p + 2 > d + n) {
+        al = SSL_AD_DECODE_ERROR;
+        SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
+        goto f_err;
+    }
     n2s(p, i);
-    if ((i == 0) && (j != 0)) {
-        /* we need a cipher if we are not resuming a session */
+
+    if (i == 0) {
         al = SSL_AD_ILLEGAL_PARAMETER;
         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_NO_CIPHERS_SPECIFIED);
         goto f_err;
     }
-    if ((p + i) >= (d + n)) {
+
+    /* i bytes of cipher data + 1 byte for compression length later */
+    if ((p + i + 1) > (d + n)) {
         /* not enough data */
         al = SSL_AD_DECODE_ERROR;
         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
         goto f_err;
     }
-    if ((i > 0) && (ssl_bytes_to_cipher_list(s, p, i, &(ciphers))
-                    == NULL)) {
+    if (ssl_bytes_to_cipher_list(s, p, i, &(ciphers)) == NULL) {
         goto err;
     }
     p += i;
 
     /* If it is a hit, check that the cipher is in the list */
-    if ((s->hit) && (i > 0)) {
+    if (s->hit) {
         j = 0;
         id = s->session->cipher->id;
 
@@ -1336,8 +1375,8 @@ int ssl3_get_client_hello(SSL *s)
             sk_SSL_CIPHER_free(s->session->ciphers);
         s->session->ciphers = ciphers;
         if (ciphers == NULL) {
-            al = SSL_AD_ILLEGAL_PARAMETER;
-            SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_NO_CIPHERS_PASSED);
+            al = SSL_AD_INTERNAL_ERROR;
+            SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
             goto f_err;
         }
         ciphers = NULL;
@@ -1501,7 +1540,7 @@ int ssl3_send_server_hello(SSL *s)
 #endif
         /* do the header */
         l = (p - d);
-        if(!ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l)) {
+        if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l)) {
             SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
             return -1;
         }
@@ -1516,7 +1555,7 @@ int ssl3_send_server_done(SSL *s)
 {
 
     if (s->state == SSL3_ST_SW_SRVR_DONE_A) {
-        if(!ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0)) {
+        if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0)) {
             SSLerr(SSL_F_SSL3_SEND_SERVER_DONE, ERR_R_INTERNAL_ERROR);
             return -1;
         }
@@ -1966,7 +2005,7 @@ int ssl3_send_server_key_exchange(SSL *s)
             }
         }
 
-        if(!ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n)) {
+        if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n)) {
             al = SSL_AD_HANDSHAKE_FAILURE;
             SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
             goto f_err;
@@ -2048,7 +2087,7 @@ int ssl3_send_certificate_request(SSL *s)
         p = ssl_handshake_start(s) + off;
         s2n(nl, p);
 
-        if(!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n)) {
+        if (!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n)) {
             SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR);
             return -1;
         }
@@ -2238,7 +2277,7 @@ int ssl3_get_client_key_exchange(SSL *s)
                                                         sizeof
                                                         (rand_premaster_secret));
         OPENSSL_cleanse(p, sizeof(rand_premaster_secret));
-        if(s->session->master_key_length < 0) {
+        if (s->session->master_key_length < 0) {
             al = SSL_AD_INTERNAL_ERROR;
             SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
             goto f_err;
@@ -2335,7 +2374,7 @@ int ssl3_get_client_key_exchange(SSL *s)
                                                         session->master_key,
                                                         p, i);
         OPENSSL_cleanse(p, i);
-        if(s->session->master_key_length < 0) {
+        if (s->session->master_key_length < 0) {
             al = SSL_AD_INTERNAL_ERROR;
             SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
             goto f_err;
@@ -2505,7 +2544,7 @@ int ssl3_get_client_key_exchange(SSL *s)
                                                         s->
                                                         session->master_key,
                                                         pms, outl);
-        if(s->session->master_key_length < 0) {
+        if (s->session->master_key_length < 0) {
             al = SSL_INTERNAL_ERROR;
             SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
             goto f_err;
@@ -2658,7 +2697,7 @@ int ssl3_get_client_key_exchange(SSL *s)
                                                         p, i);
 
         OPENSSL_cleanse(p, i);
-        if(s->session->master_key_length < 0) {
+        if (s->session->master_key_length < 0) {
             al = SSL_AD_INTERNAL_ERROR;
             SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
             goto f_err;
@@ -2747,7 +2786,7 @@ int ssl3_get_client_key_exchange(SSL *s)
                                                         session->master_key,
                                                         psk_or_pre_ms,
                                                         pre_ms_len);
-        if(s->session->master_key_length < 0) {
+        if (s->session->master_key_length < 0) {
             al = SSL_AD_INTERNAL_ERROR;
             SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
             goto psk_err;
@@ -2853,7 +2892,7 @@ int ssl3_get_client_key_exchange(SSL *s)
                                                         s->
                                                         session->master_key,
                                                         premaster_secret, 32);
-        if(s->session->master_key_length < 0) {
+        if (s->session->master_key_length < 0) {
             al = SSL_AD_INTERNAL_ERROR;
             SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
             goto f_err;
@@ -2869,8 +2908,7 @@ int ssl3_get_client_key_exchange(SSL *s)
         EVP_PKEY_CTX_free(pkey_ctx);
         if (ret)
             return ret;
-        else
-            goto err;
+        goto err;
     } else {
         al = SSL_AD_HANDSHAKE_FAILURE;
         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_R_UNKNOWN_CIPHER_TYPE);
@@ -3430,7 +3468,7 @@ int ssl3_send_newsession_ticket(SSL *s)
         /* Skip ticket lifetime hint */
         p = ssl_handshake_start(s) + 4;
         s2n(len - 6, p);
-        if(!ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len))
+        if (!ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len))
             goto err;
         s->state = SSL3_ST_SW_SESSION_TICKET_B;
         OPENSSL_free(senc);