Check return value of EVP_* functions, and check if length before en/decryption

matches that after in meta.c.

diff --git a/src/meta.c b/src/meta.c
index dacb1df..5048e63 100644 (file)
--- a/src/meta.c
+++ b/src/meta.c
@@ -17,7 +17,7 @@
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
-    $Id: meta.c,v 1.1.2.44 2003/08/28 21:05:10 guus Exp $
+    $Id: meta.c,v 1.1.2.45 2003/10/10 16:24:24 guus Exp $
 */
 
 #include "system.h"
@@ -46,7 +46,11 @@ bool send_meta(connection_t *c, const char *buffer, int length)
                           c->name, c->hostname);
 
        if(c->status.encryptout) {
-               EVP_EncryptUpdate(c->outctx, outbuf, &outlen, buffer, length);
+               result = EVP_EncryptUpdate(c->outctx, outbuf, &outlen, buffer, length);
+               if(!result || outlen != length) {
+                       logger(LOG_ERR, _("Error while encrypting metadata to %s (%s): %s"), ERR_error_string(ERR_get_error(), NULL));
+                       return false;
+               }
                bufp = outbuf;
                length = outlen;
        } else
@@ -89,8 +93,8 @@ void broadcast_meta(connection_t *from, const char *buffer, int length)
 
 bool receive_meta(connection_t *c)
 {
-       int oldlen, i;
-       int lenin, reqlen;
+       int oldlen, i, result;
+       int lenin, lenout, reqlen;
        bool decrypted = false;
        char inbuf[MAXBUFSIZE];
 
@@ -123,11 +127,15 @@ bool receive_meta(connection_t *c)
        oldlen = c->buflen;
        c->buflen += lenin;
 
-       while(lenin) {
+       while(lenin > 0) {
                /* Decrypt */
 
                if(c->status.decryptin && !decrypted) {
-                       EVP_DecryptUpdate(c->inctx, inbuf, &lenin, c->buffer + oldlen, lenin);
+                       result = EVP_DecryptUpdate(c->inctx, inbuf, &lenout, c->buffer + oldlen, lenin);
+                       if(!result || lenout != lenin) {
+                               logger(LOG_ERR, _("Error while decrypting metadata from %s (%s): %s"), ERR_error_string(ERR_get_error(), NULL));
+                               return false;
+                       }
                        memcpy(c->buffer + oldlen, inbuf, lenin);
                        decrypted = true;
                }

diff --git a/src/net_packet.c b/src/net_packet.c
index a989b09..00e36fc 100644 (file)
--- a/src/net_packet.c
+++ b/src/net_packet.c
@@ -17,7 +17,7 @@
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
-    $Id: net_packet.c,v 1.1.2.41 2003/09/23 20:59:01 guus Exp $
+    $Id: net_packet.c,v 1.1.2.42 2003/10/10 16:24:24 guus Exp $
 */
 
 #include "system.h"
@@ -114,7 +114,7 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
        vpn_packet_t *outpkt = pkt[0];
        int outlen, outpad;
        char hmac[EVP_MAX_MD_SIZE];
-       int i;
+       int i, result;
 
        cp();
 
@@ -145,12 +145,18 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
        if(myself->cipher) {
                outpkt = pkt[nextpkt++];
 
-//             EVP_DecryptInit_ex(&packet_ctx, myself->cipher, NULL, myself->key,
-//                                             myself->key + myself->cipher->key_len);
                EVP_DecryptInit_ex(&packet_ctx, NULL, NULL, NULL, NULL);
-               EVP_DecryptUpdate(&packet_ctx, (char *) &outpkt->seqno, &outlen,
-                                                 (char *) &inpkt->seqno, inpkt->len);
-               EVP_DecryptFinal_ex(&packet_ctx, (char *) &outpkt->seqno + outlen, &outpad);
+               if(!EVP_DecryptUpdate(&packet_ctx, (char *) &outpkt->seqno, &outlen,
+                                       (char *) &inpkt->seqno, inpkt->len)) {
+                       ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Error decrypting packet from %s (%s): %s"),
+                                               n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL));
+                       return;
+               }
+               if(!EVP_DecryptFinal_ex(&packet_ctx, (char *) &outpkt->seqno + outlen, &outpad)) {
+                       ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Error decrypting packet from %s (%s): %s"),
+                                               n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL));
+                       return;
+               }
                
                outpkt->len = outlen + outpad;
                inpkt = outpkt;
@@ -189,8 +195,8 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
                outpkt = pkt[nextpkt++];
 
                if((outpkt->len = uncompress_packet(outpkt->data, inpkt->data, inpkt->len, myself->compression)) < 0) {
-                       logger(LOG_ERR, _("Error while uncompressing packet from %s (%s)"),
-                                  n->name, n->hostname);
+                       ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while uncompressing packet from %s (%s)"),
+                                                n->name, n->hostname);
                        return;
                }
 
@@ -264,7 +270,7 @@ static void send_udppacket(node_t *n, vpn_packet_t *inpkt)
                outpkt = pkt[nextpkt++];
 
                if((outpkt->len = compress_packet(outpkt->data, inpkt->data, inpkt->len, n->compression)) < 0) {
-                       logger(LOG_ERR, _("Error while compressing packet to %s (%s)"),
+                       ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while compressing packet to %s (%s)"),
                                   n->name, n->hostname);
                        return;
                }
@@ -282,11 +288,18 @@ static void send_udppacket(node_t *n, vpn_packet_t *inpkt)
        if(n->cipher) {
                outpkt = pkt[nextpkt++];
 
-//             EVP_EncryptInit_ex(&packet_ctx, n->cipher, NULL, n->key, n->key + n->cipher->key_len);
                EVP_EncryptInit_ex(&n->packet_ctx, NULL, NULL, NULL, NULL);
-               EVP_EncryptUpdate(&n->packet_ctx, (char *) &outpkt->seqno, &outlen,
-                                                 (char *) &inpkt->seqno, inpkt->len);
-               EVP_EncryptFinal_ex(&n->packet_ctx, (char *) &outpkt->seqno + outlen, &outpad);
+               if(!EVP_EncryptUpdate(&n->packet_ctx, (char *) &outpkt->seqno, &outlen,
+                                       (char *) &inpkt->seqno, inpkt->len)) {
+                       ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while encrypting packet to %s (%s): %s"),
+                                               n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL));
+                       return;
+               }
+               if(!EVP_EncryptFinal_ex(&n->packet_ctx, (char *) &outpkt->seqno + outlen, &outpad)) {
+                       ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while encrypting packet to %s (%s): %s"),
+                                               n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL));
+                       return;
+               }
 
                outpkt->len = outlen + outpad;
                inpkt = outpkt;