Merge 4.80.1 security fix in.

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

diff --git a/src/src/acl.c b/src/src/acl.c
index 5cd0c3507f9c99b8d99fc228c88ad2bcf77488da..6c81d349dea6e1a5dd96878fc22e522b42d3605e 100644 (file)
--- a/src/src/acl.c
+++ b/src/src/acl.c
@@ -88,6 +88,7 @@ enum { ACLC_ACL,
 #ifdef WITH_CONTENT_SCAN
        ACLC_REGEX,
 #endif
+       ACLC_REMOVE_HEADER,
        ACLC_SENDER_DOMAINS,
        ACLC_SENDERS,
        ACLC_SET,
@@ -150,6 +151,7 @@ static uschar *conditions[] = {
 #ifdef WITH_CONTENT_SCAN
   US"regex",
 #endif
+  US"remove_header",
   US"sender_domains", US"senders", US"set",
 #ifdef WITH_CONTENT_SCAN
   US"spam",
@@ -280,6 +282,7 @@ static uschar cond_expand_at_top[] = {
 #ifdef WITH_CONTENT_SCAN
   TRUE,    /* regex */
 #endif
+  TRUE,    /* remove_header */
   FALSE,   /* sender_domains */
   FALSE,   /* senders */
   TRUE,    /* set */
@@ -340,6 +343,7 @@ static uschar cond_modifiers[] = {
 #ifdef WITH_CONTENT_SCAN
   FALSE,   /* regex */
 #endif
+  TRUE,    /* remove_header */
   FALSE,   /* sender_domains */
   FALSE,   /* senders */
   TRUE,    /* set */
@@ -465,6 +469,12 @@ static unsigned int cond_forbids[] = {
     (1<<ACL_WHERE_MIME)),
   #endif
 
+  (unsigned int)
+  ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)|       /* remove_header */
+    (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)|
+    (1<<ACL_WHERE_MIME)|(1<<ACL_WHERE_NOTSMTP)|
+    (1<<ACL_WHERE_NOTSMTP_START)),
+
   (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)|      /* sender_domains */
     (1<<ACL_WHERE_HELO)|
     (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)|
@@ -948,10 +958,13 @@ setup_header(uschar *hstring)
 uschar *p, *q;
 int hlen = Ustrlen(hstring);
 
-/* An empty string does nothing; otherwise add a final newline if necessary. */
+/* Ignore any leading newlines */
+while (*hstring == '\n') hstring++, hlen--;
 
+/* An empty string does nothing; ensure exactly one final newline. */
 if (hlen <= 0) return;
-if (hstring[hlen-1] != '\n') hstring = string_sprintf("%s\n", hstring);
+if (hstring[--hlen] != '\n') hstring = string_sprintf("%s\n", hstring);
+else while(hstring[--hlen] == '\n') hstring[hlen+1] = '\0';
 
 /* Loop for multiple header lines, taking care about continuations */
 
@@ -1037,6 +1050,69 @@ for (p = q = hstring; *p != 0; )
 
 
 
+/*************************************************
+*        List the added header lines            *
+*************************************************/
+uschar *
+fn_hdrs_added(void)
+{
+uschar * ret = NULL;
+header_line * h = acl_added_headers;
+uschar * s;
+uschar * cp;
+int size = 0;
+int ptr = 0;
+
+if (!h) return NULL;
+
+do
+  {
+  s = h->text;
+  while ((cp = Ustrchr(s, '\n')) != NULL)
+    {
+    if (cp[1] == '\0') break;
+
+    /* contains embedded newline; needs doubling */
+    ret = string_cat(ret, &size, &ptr, s, cp-s+1);
+    ret = string_cat(ret, &size, &ptr, "\n", 1);
+    s = cp+1;
+    }
+  /* last bit of header */
+
+  ret = string_cat(ret, &size, &ptr, s, cp-s+1);       /* newline-sep list */
+  }
+while(h = h->next);
+
+ret[ptr-1] = '\0';     /* overwrite last newline */
+return ret;
+}
+
+
+/*************************************************
+*        Set up removed header line(s)           *
+*************************************************/
+
+/* This function is called by the remove_header modifier.  The argument is
+treated as a sequence of header names which are added to a colon separated
+list, provided there isn't an identical one already there.
+
+Argument:   string of header names
+Returns:    nothing
+*/
+
+static void
+setup_remove_header(uschar *hnames)
+{
+if (*hnames != 0)
+  {
+  if (acl_removed_headers == NULL)
+    acl_removed_headers = hnames;
+  else
+    acl_removed_headers = string_sprintf("%s : %s", acl_removed_headers, hnames);
+  }
+}
+
+
 
 /*************************************************
 *               Handle warnings                  *
@@ -3294,6 +3370,10 @@ for (; cb != NULL; cb = cb->next)
     break;
     #endif
 
+    case ACLC_REMOVE_HEADER:
+    setup_remove_header(arg);
+    break;
+
     case ACLC_SENDER_DOMAINS:
       {
       uschar *sdomain;
@@ -3874,8 +3954,11 @@ acl_check_wargs(int where, address_item *addr, uschar *s, int level,
 {
 uschar * tmp;
 uschar * tmp_arg[9];   /* must match acl_arg[] */
+uschar * sav_arg[9];   /* must match acl_arg[] */
+int sav_narg;
 uschar * name;
 int i;
+int ret;
 
 if (!(tmp = string_dequote(&s)) || !(name = expand_string(tmp)))
   goto bad;
@@ -3890,11 +3973,25 @@ for (i = 0; i < 9; i++)
     goto bad;
     }
   }
+
+sav_narg = acl_narg;
 acl_narg = i;
-for (i = 0; i < acl_narg; i++) acl_arg[i] = tmp_arg[i];
-while (i < 9) acl_arg[i++] = NULL;
+for (i = 0; i < acl_narg; i++)
+  {
+  sav_arg[i] = acl_arg[i];
+  acl_arg[i] = tmp_arg[i];
+  }
+while (i < 9)
+  {
+  sav_arg[i] = acl_arg[i];
+  acl_arg[i++] = NULL;
+  }
+
+ret = acl_check_internal(where, addr, name, level, user_msgptr, log_msgptr);
 
-return acl_check_internal(where, addr, name, level, user_msgptr, log_msgptr);
+acl_narg = sav_narg;
+for (i = 0; i < 9; i++) acl_arg[i] = sav_arg[i];
+return ret;
 
 bad:
 if (expand_string_forcedfail) return ERROR;