Malware: make "sock" cmdline default usable. Bug 2111

[users/jgh/exim.git] / src / src / spam.c

diff --git a/src/src/spam.c b/src/src/spam.c
index 1159d36874ff02df9b41ffffc405c836875274c2..49776a30d66b0595559e3a0f37b24c23ce06006a 100644 (file)
--- a/src/src/spam.c
+++ b/src/src/spam.c
@@ -2,8 +2,10 @@
 *     Exim - an Internet mail transport agent    *
 *************************************************/
 
-/* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003 - 2015 */
-/* License: GPL */
+/* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003 - 2015
+ * License: GPL
+ * Copyright (c) The Exim Maintainers 2016
+ */
 
 /* Code for calling spamassassin's spamd. Called from acl.c. */
 
@@ -249,7 +251,7 @@ if (*spamd_address == '$')
 else
   spamd_address_work = spamd_address;
 
-DEBUG(D_acl) debug_printf("spamd: addrlist '%s'\n", spamd_address_work);
+DEBUG(D_acl) debug_printf_indent("spamd: addrlist '%s'\n", spamd_address_work);
 
 /* check if previous spamd_address was expanded and has changed. dump cached results if so */
 if (  spam_ok
@@ -263,11 +265,9 @@ if (spam_ok && Ustrcmp(prev_user_name, user_name) == 0)
   return override ? OK : spam_rc;
 
 /* make sure the eml mbox file is spooled up */
-mbox_file = spool_mbox(&mbox_size, NULL);
 
-if (mbox_file == NULL)
-  {
-  /* error while spooling */
+if (!(mbox_file = spool_mbox(&mbox_size, NULL, NULL)))
+  {                                                            /* error while spooling */
   log_write(0, LOG_MAIN|LOG_PANIC,
         "%s error while creating mbox spool file", loglabel);
   return DEFER;
@@ -285,15 +285,14 @@ start = time(NULL);
   /* Check how many spamd servers we have
      and register their addresses */
   sep = 0;                             /* default colon-sep */
-  while ((address = string_nextinlist(&spamd_address_list_ptr, &sep,
-                                     NULL, 0)) != NULL)
+  while ((address = string_nextinlist(&spamd_address_list_ptr, &sep, NULL, 0)))
     {
     const uschar * sublist;
     int sublist_sep = -(int)' ';       /* default space-sep */
     unsigned args;
     uschar * s;
 
-    DEBUG(D_acl) debug_printf("spamd: addr entry '%s'\n", address);
+    DEBUG(D_acl) debug_printf_indent("spamd: addr entry '%s'\n", address);
     sd = (spamd_address_container *)store_get(sizeof(spamd_address_container));
 
     for (sublist = address, args = 0, spamd_param_init(sd);
@@ -301,7 +300,7 @@ start = time(NULL);
         args++
         )
       {
-       DEBUG(D_acl) debug_printf("spamd:  addr parm '%s'\n", s);
+       DEBUG(D_acl) debug_printf_indent("spamd:  addr parm '%s'\n", s);
        switch (args)
        {
        case 0:   sd->hostspec = s;
@@ -340,7 +339,7 @@ start = time(NULL);
     {
     uschar * errstr;
 
-    DEBUG(D_acl) debug_printf("spamd: trying server %s\n", sd->hostspec);
+    DEBUG(D_acl) debug_printf_indent("spamd: trying server %s\n", sd->hostspec);
 
     for (;;)
       {
@@ -348,7 +347,7 @@ start = time(NULL);
          || sd->retry <= 0
         )
        break;
-      DEBUG(D_acl) debug_printf("spamd: server %s: retry conn\n", sd->hostspec);
+      DEBUG(D_acl) debug_printf_indent("spamd: server %s: retry conn\n", sd->hostspec);
       while (sd->retry > 0) sd->retry = sleep(sd->retry);
       }
     if (spamd_sock >= 0)
@@ -412,12 +411,12 @@ if (wrote == -1)
   }
 
 /* now send the file */
-/* spamd sometimes accepts conections but doesn't read data off
+/* spamd sometimes accepts connections but doesn't read data off
  * the connection.  We make the file descriptor non-blocking so
  * that the write will only write sufficient data without blocking
- * and we poll the desciptor to make sure that we can write without
+ * and we poll the descriptor to make sure that we can write without
  * blocking.  Short writes are gracefully handled and if the whole
- * trasaction takes too long it is aborted.
+ * transaction takes too long it is aborted.
  * Note: poll() is not supported in OSX 10.2 and is reported to be
  *       broken in more recent versions (up to 10.4).
  */
@@ -492,7 +491,8 @@ if (ferror(mbox_file))
 (void)fclose(mbox_file);
 
 /* we're done sending, close socket for writing */
-shutdown(spamd_sock,SHUT_WR);
+if (!sd->is_rspamd)
+  shutdown(spamd_sock,SHUT_WR);
 
 /* read spamd response using what's left of the timeout.  */
 memset(spamd_buffer, 0, sizeof(spamd_buffer));
@@ -500,8 +500,9 @@ offset = 0;
 while ((i = ip_recv(spamd_sock,
                   spamd_buffer + offset,
                   sizeof(spamd_buffer) - offset - 1,
-                  sd->timeout - time(NULL) + start)) > 0 )
+                  sd->timeout - time(NULL) + start)) > 0)
   offset += i;
+spamd_buffer[offset] = '\0';   /* guard byte */
 
 /* error handling */
 if (i <= 0 && errno != 0)
@@ -518,10 +519,12 @@ if (i <= 0 && errno != 0)
 if (sd->is_rspamd)
   {                            /* rspamd variant of reply */
   int r;
-  if ((r = sscanf(CS spamd_buffer,
+  if (  (r = sscanf(CS spamd_buffer,
          "RSPAMD/%7s 0 EX_OK\r\nMetric: default; %7s %lf / %lf / %lf\r\n%n",
          spamd_version, spamd_short_result, &spamd_score, &spamd_threshold,
-         &spamd_reject_score, &spamd_report_offset)) != 5)
+         &spamd_reject_score, &spamd_report_offset)) != 5
+     || spamd_report_offset >= offset          /* verify within buffer */
+     )
     {
     log_write(0, LOG_MAIN|LOG_PANIC,
              "%s cannot parse spamd %s, output: %d", loglabel, callout_address, r);