Be liberal in accepting KEY_CHANGED/REQ_KEY/ANS_KEY requests.

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

diff --git a/src/protocol_key.c b/src/protocol_key.c
index 92948aa4d2f5571e94dc50c3427968a1cad89669..ad393d38668a52d8b6feb261b10d22bc1b2d5531 100644 (file)
--- a/src/protocol_key.c
+++ b/src/protocol_key.c
@@ -57,6 +57,11 @@ bool key_changed_h(connection_t *c) {
                return false;
        }
 
+       if(!check_id(name)) {
+               logger(LOG_ERR, "Got bad %s from %s (%s): %s", "KEY_CHANGED", c->name, c->hostname, "invalid name");
+               return false;
+       }
+
        if(seen_request(c->buffer))
                return true;
 
@@ -65,11 +70,11 @@ bool key_changed_h(connection_t *c) {
        if(!n) {
                logger(LOG_ERR, "Got %s from %s (%s) origin %s which does not exist",
                           "KEY_CHANGED", c->name, c->hostname, name);
-               return false;
+               return true;
        }
 
        n->status.validkey = false;
-       n->status.waitingforkey = false;
+       n->last_req_key = 0;
 
        /* Tell the others */
 
@@ -94,12 +99,17 @@ bool req_key_h(connection_t *c) {
                return false;
        }
 
+       if(!check_id(from_name) || !check_id(to_name)) {
+               logger(LOG_ERR, "Got bad %s from %s (%s): %s", "REQ_KEY", c->name, c->hostname, "invalid name");
+               return false;
+       }
+
        from = lookup_node(from_name);
 
        if(!from) {
                logger(LOG_ERR, "Got %s from %s (%s) origin %s which does not exist in our connection list",
                           "REQ_KEY", c->name, c->hostname, from_name);
-               return false;
+               return true;
        }
 
        to = lookup_node(to_name);
@@ -107,7 +117,7 @@ bool req_key_h(connection_t *c) {
        if(!to) {
                logger(LOG_ERR, "Got %s from %s (%s) destination %s which does not exist in our connection list",
                           "REQ_KEY", c->name, c->hostname, to_name);
-               return false;
+               return true;
        }
 
        /* Check if this key request is for us */
@@ -116,7 +126,7 @@ bool req_key_h(connection_t *c) {
                send_ans_key(from);
        } else {
                if(tunnelserver)
-                       return false;
+                       return true;
 
                if(!to->status.reachable) {
                        logger(LOG_WARNING, "Got %s from %s (%s) destination %s which is not reachable",
@@ -180,12 +190,17 @@ bool ans_key_h(connection_t *c) {
                return false;
        }
 
+       if(!check_id(from_name) || !check_id(to_name)) {
+               logger(LOG_ERR, "Got bad %s from %s (%s): %s", "ANS_KEY", c->name, c->hostname, "invalid name");
+               return false;
+       }
+
        from = lookup_node(from_name);
 
        if(!from) {
                logger(LOG_ERR, "Got %s from %s (%s) origin %s which does not exist in our connection list",
                           "ANS_KEY", c->name, c->hostname, from_name);
-               return false;
+               return true;
        }
 
        to = lookup_node(to_name);
@@ -193,14 +208,14 @@ bool ans_key_h(connection_t *c) {
        if(!to) {
                logger(LOG_ERR, "Got %s from %s (%s) destination %s which does not exist in our connection list",
                           "ANS_KEY", c->name, c->hostname, to_name);
-               return false;
+               return true;
        }
 
        /* Forward it if necessary */
 
        if(to != myself) {
                if(tunnelserver)
-                       return false;
+                       return true;
 
                if(!to->status.reachable) {
                        logger(LOG_WARNING, "Got %s from %s (%s) destination %s which is not reachable",
@@ -218,7 +233,6 @@ bool ans_key_h(connection_t *c) {
        from->outkeylength = strlen(key) / 2;
        hex2bin(key, from->outkey, from->outkeylength);
 
-       from->status.waitingforkey = false;
        /* Check and lookup cipher and digest algorithms */
 
        if(cipher) {
@@ -227,13 +241,13 @@ bool ans_key_h(connection_t *c) {
                if(!from->outcipher) {
                        logger(LOG_ERR, "Node %s (%s) uses unknown cipher!", from->name,
                                   from->hostname);
-                       return false;
+                       return true;
                }
 
                if(from->outkeylength != from->outcipher->key_len + from->outcipher->iv_len) {
                        logger(LOG_ERR, "Node %s (%s) uses wrong keylength!", from->name,
                                   from->hostname);
-                       return false;
+                       return true;
                }
        } else {
                from->outcipher = NULL;
@@ -247,13 +261,13 @@ bool ans_key_h(connection_t *c) {
                if(!from->outdigest) {
                        logger(LOG_ERR, "Node %s (%s) uses unknown digest!", from->name,
                                   from->hostname);
-                       return false;
+                       return true;
                }
 
                if(from->outmaclength > from->outdigest->md_size || from->outmaclength < 0) {
                        logger(LOG_ERR, "Node %s (%s) uses bogus MAC length!",
                                   from->name, from->hostname);
-                       return false;
+                       return true;
                }
        } else {
                from->outdigest = NULL;
@@ -261,7 +275,7 @@ bool ans_key_h(connection_t *c) {
 
        if(compression < 0 || compression > 11) {
                logger(LOG_ERR, "Node %s (%s) uses bogus compression level!", from->name, from->hostname);
-               return false;
+               return true;
        }
        
        from->outcompression = compression;
@@ -270,7 +284,7 @@ bool ans_key_h(connection_t *c) {
                if(!EVP_EncryptInit_ex(&from->outctx, from->outcipher, NULL, (unsigned char *)from->outkey, (unsigned char *)from->outkey + from->outcipher->key_len)) {
                        logger(LOG_ERR, "Error during initialisation of key from %s (%s): %s",
                                        from->name, from->hostname, ERR_error_string(ERR_get_error(), NULL));
-                       return false;
+                       return true;
                }
 
        from->status.validkey = true;