Track tainted data and refuse to expand it

[exim.git] / src / src / routers / iplookup.c

diff --git a/src/src/routers/iplookup.c b/src/src/routers/iplookup.c
index fe0f961aed1789f8eed43f961ef4f5530a215af7..4ceb1f59a2fa08158dd02bfcce4a479a42dc1d61 100644 (file)
--- a/src/src/routers/iplookup.c
+++ b/src/src/routers/iplookup.c
@@ -2,7 +2,7 @@
 *     Exim - an Internet mail transport agent    *
 *************************************************/
 
-/* Copyright (c) University of Cambridge 1995 - 2015 */
+/* Copyright (c) University of Cambridge 1995 - 2018 */
 /* See the file NOTICE for conditions of use and distribution. */
 
 
@@ -160,7 +160,7 @@ uschar *reply;
 uschar *hostname, *reroute, *domain;
 const uschar *listptr;
 uschar host_buffer[256];
-host_item *host = store_get(sizeof(host_item));
+host_item *host = store_get(sizeof(host_item), FALSE);
 address_item *new_addr;
 iplookup_router_options_block *ob =
   (iplookup_router_options_block *)(rblock->options_block);
@@ -176,7 +176,7 @@ pw = pw;
 DEBUG(D_route) debug_printf("%s router called for %s: domain = %s\n",
   rblock->name, addr->address, addr->domain);
 
-reply = store_get(256);
+reply = store_get(256, TRUE);  /* tainted data */
 
 /* Build the query string to send. If not explicitly given, a default of
 "user@domain user@domain" is used. */
@@ -230,7 +230,8 @@ while ((hostname = string_nextinlist(&listptr, &sep, host_buffer,
 
   for (h = host; h; h = h->next)
     {
-    int host_af, query_socket;
+    int host_af;
+    client_conn_ctx query_cctx = {0};
 
     /* Skip any hosts for which we have no address */
 
@@ -241,9 +242,9 @@ while ((hostname = string_nextinlist(&listptr, &sep, host_buffer,
 
     host_af = (Ustrchr(h->address, ':') != NULL)? AF_INET6 : AF_INET;
 
-    query_socket = ip_socket(ob->protocol == ip_udp ? SOCK_DGRAM:SOCK_STREAM,
+    query_cctx.sock = ip_socket(ob->protocol == ip_udp ? SOCK_DGRAM:SOCK_STREAM,
       host_af);
-    if (query_socket < 0)
+    if (query_cctx.sock < 0)
       {
       if (ob->optional) return PASS;
       addr->message = string_sprintf("failed to create socket in %s router",
@@ -254,11 +255,12 @@ while ((hostname = string_nextinlist(&listptr, &sep, host_buffer,
     /* Connect to the remote host, under a timeout. In fact, timeouts can occur
     here only for TCP calls; for a UDP socket, "connect" always works (the
     router will timeout later on the read call). */
+/*XXX could take advantage of TFO */
 
-    if (ip_connect(query_socket, host_af, h->address,ob->port, ob->timeout,
-                       ob->protocol != ip_udp) < 0)
+    if (ip_connect(query_cctx.sock, host_af, h->address,ob->port, ob->timeout,
+               ob->protocol == ip_udp ? NULL : &tcp_fastopen_nodata) < 0)
       {
-      close(query_socket);
+      close(query_cctx.sock);
       DEBUG(D_route)
         debug_printf("connection to %s failed: %s\n", h->address,
           strerror(errno));
@@ -267,18 +269,18 @@ while ((hostname = string_nextinlist(&listptr, &sep, host_buffer,
 
     /* Send the query. If it fails, just continue with the next address. */
 
-    if (send(query_socket, query, query_len, 0) < 0)
+    if (send(query_cctx.sock, query, query_len, 0) < 0)
       {
       DEBUG(D_route) debug_printf("send to %s failed\n", h->address);
-      (void)close(query_socket);
+      (void)close(query_cctx.sock);
       continue;
       }
 
     /* Read the response and close the socket. If the read fails, try the
     next IP address. */
 
-    count = ip_recv(query_socket, reply, sizeof(reply) - 1, ob->timeout);
-    (void)close(query_socket);
+    count = ip_recv(&query_cctx, reply, sizeof(reply) - 1, time(NULL) + ob->timeout);
+    (void)close(query_cctx.sock);
     if (count <= 0)
       {
       DEBUG(D_route) debug_printf("%s from %s\n", (errno == ETIMEDOUT)?
@@ -393,7 +395,6 @@ the chain of new addressess. */
 new_addr = deliver_make_addr(reroute, TRUE);
 new_addr->parent = addr;
 
-copyflag(new_addr, addr, af_propagate);
 new_addr->prop = addr->prop;
 
 if (addr->child_count == USHRT_MAX)
@@ -403,7 +404,7 @@ addr->child_count++;
 new_addr->next = *addr_new;
 *addr_new = new_addr;
 
-/* Set up the errors address, if any, and the additional and removeable headers
+/* Set up the errors address, if any, and the additional and removable headers
 for this new address. */
 
 rc = rf_get_errors_address(addr, rblock, verify, &new_addr->prop.errors_address);