Enforce maximum amount of bytes sent/received on meta-connections.

[oweals/tinc.git] / src / meta.c

diff --git a/src/meta.c b/src/meta.c
index 06ab96e454fa5a3ff97bca1a0858b6a730d61815..63f565fe5dbf195997027fa28bca3c4e15083e5b 100644 (file)
--- a/src/meta.c
+++ b/src/meta.c
@@ -62,6 +62,14 @@ bool send_meta(connection_t *c, const char *buffer, int length) {
 
        /* Add our data to buffer */
        if(c->status.encryptout) {
+               /* Check encryption limits */
+               if(length > c->outbudget) {
+                       ifdebug(META) logger(LOG_ERR, "Byte limit exceeded for encryption to %s (%s)", c->name, c->hostname);
+                       return false;
+               } else {
+                       c->outbudget -= length;
+               }
+
                result = EVP_EncryptUpdate(c->outctx, (unsigned char *)c->outbuf + c->outbufstart + c->outbuflen,
                                &outlen, (unsigned char *)buffer, length);
                if(!result || outlen < length) {
@@ -175,6 +183,14 @@ bool receive_meta(connection_t *c) {
                /* Decrypt */
 
                if(c->status.decryptin && !decrypted) {
+                       /* Check decryption limits */
+                       if(lenin > c->inbudget) {
+                               ifdebug(META) logger(LOG_ERR, "Byte limit exceeded for decryption from %s (%s)", c->name, c->hostname);
+                               return false;
+                       } else {
+                               c->inbudget -= lenin;
+                       }
+
                        result = EVP_DecryptUpdate(c->inctx, (unsigned char *)inbuf, &lenout, (unsigned char *)c->buffer + oldlen, lenin);
                        if(!result || lenout != lenin) {
                                logger(LOG_ERR, "Error while decrypting metadata from %s (%s): %s",