X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fmeta.c;h=ccc3b2e670d5ae9a0210929d804703323f97983f;hp=daa55e4077f6ee798395304778e5d9f5f810570e;hb=5c5ae8c48e0414cb4831ccfd2b147ab65bb5fd5c;hpb=776dbf88df1911ec379c2fece0089fd2f5c71021

diff --git a/src/meta.c b/src/meta.c
index daa55e40..ccc3b2e6 100644
--- a/src/meta.c
+++ b/src/meta.c
@@ -1,6 +1,6 @@
 /*
     meta.c -- handle the meta communication
-    Copyright (C) 2000-2014 Guus Sliepen <guus@tinc-vpn.org>,
+    Copyright (C) 2000-2017 Guus Sliepen <guus@tinc-vpn.org>,
                   2000-2005 Ivo Timmermans
                   2006      Scott Lamb <slamb@slamb.org>
 
@@ -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) {
@@ -96,7 +104,7 @@ bool flush_meta(connection_t *c) {
 			} else if(errno == EINTR) {
 				continue;
 			} else if(sockwouldblock(sockerrno)) {
-				ifdebug(CONNECTIONS) logger(LOG_DEBUG, "Flushing %d bytes to %s (%s) would block",
+				ifdebug(META) logger(LOG_DEBUG, "Flushing %d bytes to %s (%s) would block",
 						c->outbuflen, c->name, c->hostname);
 				return true;
 			} else {
@@ -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",