Add $smtp_command_history variable

[exim.git] / src / src / parse.c

diff --git a/src/src/parse.c b/src/src/parse.c
index a648f755aeb66a9ad83f62599957d1c054c15dba..94a1af6ab274908905550697b3bbba29830b96ed 100644 (file)
--- a/src/src/parse.c
+++ b/src/src/parse.c
@@ -2,7 +2,7 @@
 *     Exim - an Internet mail transport agent    *
 *************************************************/
 
-/* Copyright (c) University of Cambridge 1995 - 2009 */
+/* Copyright (c) University of Cambridge 1995 - 2017 */
 /* See the file NOTICE for conditions of use and distribution. */
 
 /* Functions for parsing addresses */
@@ -187,7 +187,7 @@ The start of the last potential comment position is remembered to
 make it possible to ignore comments at the end of compound items.
 
 Argument: current character pointer
-Regurns:  new character pointer
+Returns:  new character pointer
 */
 
 static uschar *
@@ -661,7 +661,7 @@ if (*s != '@' && *s != '<')
   while (*s != '<' && (!parse_allow_group || *s != ':'))
     {
     s = read_local_part(s, t, errorptr, FALSE);
-    if (*errorptr != NULL)
+    if (*errorptr)
       {
       *errorptr = string_sprintf("%s (expected word or \"<\")", *errorptr);
       goto PARSE_FAILED;
@@ -686,8 +686,8 @@ processing it. Note that this is "if" rather than "else if" because it's also
 used after reading a preceding phrase.
 
 There are a lot of broken sendmails out there that put additional pairs of <>
-round <route-addr>s. If strip_excess_angle_brackets is set, allow any number of
-them, as long as they match. */
+round <route-addr>s.  If strip_excess_angle_brackets is set, allow a limited
+number of them, as long as they match. */
 
 if (*s == '<')
   {
@@ -696,8 +696,11 @@ if (*s == '<')
   int bracket_count = 1;
 
   s++;
-  if (strip_excess_angle_brackets)
-    while (*s == '<') { bracket_count++; s++; }
+  if (strip_excess_angle_brackets) while (*s == '<')
+   {
+   if(bracket_count++ > 5) FAILED(US"angle-brackets nested too deep");
+   s++;
+   }
 
   t = yield;
   startptr = s;
@@ -711,7 +714,7 @@ if (*s == '<')
   if (*s == '@')
     {
     s = read_route(s, t, errorptr);
-    if (*errorptr != NULL) goto PARSE_FAILED;
+    if (*errorptr) goto PARSE_FAILED;
     *t = 0;                  /* Ensure route is ignored - probably overkill */
     source_routed = TRUE;
     }
@@ -729,7 +732,7 @@ if (*s == '<')
   else
     {
     s = read_addr_spec(s, t, '>', errorptr, &domainptr);
-    if (*errorptr != NULL) goto PARSE_FAILED;
+    if (*errorptr) goto PARSE_FAILED;
     *domain = domainptr - yield;
     if (source_routed && *domain == 0)
       FAILED(US"domain missing in source-routed address");
@@ -739,9 +742,10 @@ if (*s == '<')
   if (*errorptr != NULL) goto PARSE_FAILED;
   while (bracket_count-- > 0) if (*s++ != '>')
     {
-    *errorptr = (s[-1] == 0)? US"'>' missing at end of address" :
-      string_sprintf("malformed address A: %.32s may not follow %.*s",
-        s-1, s - (uschar *)mailbox - 1, mailbox);
+    *errorptr = s[-1] == 0
+      ? US"'>' missing at end of address"
+      : string_sprintf("malformed address: %.32s may not follow %.*s",
+         s-1, s - (uschar *)mailbox - 1, mailbox);
     goto PARSE_FAILED;
     }
 
@@ -793,7 +797,7 @@ if (*s != 0)
     }
   else
     {
-    *errorptr = string_sprintf("malformed address B: %.32s may not follow %.*s",
+    *errorptr = string_sprintf("malformed address: %.32s may not follow %.*s",
       s, s - (uschar *)mailbox, mailbox);
     goto PARSE_FAILED;
     }
@@ -906,7 +910,7 @@ for (; len > 0; len--)
       {
       *t++ = '_';
       first_byte = FALSE;
-      } 
+      }
     else
       {
       sprintf(CS t, "=%02X", ch);
@@ -1425,7 +1429,7 @@ for (;;)
 
     /* Check file name if required */
 
-    if (directory != NULL)
+    if (directory)
       {
       int len = Ustrlen(directory);
       uschar *p = filename + len;
@@ -1437,16 +1441,53 @@ for (;;)
         return FF_ERROR;
         }
 
+#ifdef EXIM_HAVE_OPENAT
+      /* It is necessary to check that every component inside the directory
+      is NOT a symbolic link, in order to keep the file inside the directory.
+      This is mighty tedious. We open the directory and openat every component,
+      with a flag that fails symlinks. */
+
+      {
+      int fd = open(CS directory, O_RDONLY);
+      if (fd < 0)
+       {
+       *error = string_sprintf("failed to open directory %s", directory);
+       return FF_ERROR;
+       }
+      while (*p)
+       {
+       uschar temp;
+       int fd2;
+       uschar * q = p;
+
+       while (*++p && *p != '/') ;
+       temp = *p;
+       *p = '\0';
+
+       fd2 = openat(fd, CS q, O_RDONLY|O_NOFOLLOW);
+       close(fd);
+       *p = temp;
+       if (fd2 < 0)
+         {
+          *error = string_sprintf("failed to open %s (component of included "
+            "file); could be symbolic link", filename);
+         return FF_ERROR;
+         }
+       fd = fd2;
+       }
+      f = fdopen(fd, "rb");
+      }
+#else
       /* It is necessary to check that every component inside the directory
       is NOT a symbolic link, in order to keep the file inside the directory.
       This is mighty tedious. It is also not totally foolproof in that it
       leaves the possibility of a race attack, but I don't know how to do
       any better. */
 
-      while (*p != 0)
+      while (*p)
         {
         int temp;
-        while (*(++p) != 0 && *p != '/');
+        while (*++p && *p != '/');
         temp = *p;
         *p = 0;
         if (Ulstat(filename, &statbuf) != 0)
@@ -1466,11 +1507,16 @@ for (;;)
           return FF_ERROR;
           }
         }
+#endif
       }
 
-    /* Open and stat the file */
+#ifdef EXIM_HAVE_OPENAT
+    else
+#endif
+      /* Open and stat the file */
+      f = Ufopen(filename, "rb");
 
-    if ((f = Ufopen(filename, "rb")) == NULL)
+    if (!f)
       {
       *error = string_open_failed(errno, "included file %s", filename);
       return FF_INCLUDEFAIL;
@@ -1486,7 +1532,7 @@ for (;;)
 
     /* If directory was checked, double check that we opened a regular file */
 
-    if (directory != NULL && (statbuf.st_mode & S_IFMT) != S_IFREG)
+    if (directory && (statbuf.st_mode & S_IFMT) != S_IFREG)
       {
       *error = string_sprintf("included file %s is not a regular file in "
         "the %s directory", filename, directory);
@@ -1518,10 +1564,9 @@ for (;;)
       error, incoming_domain, directory, syntax_errors);
     if (frc != FF_DELIVERED && frc != FF_NOTDELIVERED) return frc;
 
-    if (addr != NULL)
+    if (addr)
       {
-      last = addr;
-      while (last->next != NULL) { count++; last = last->next; }
+      for (last = addr; last->next; last = last->next) count++;
       last->next = *anchor;
       *anchor = addr;
       count++;