X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/92583637b25b6bde926f9ca6be7b085e5ac8b1e6..481eeb93961ef9998901c522b498253d75124fb4:/src/src/dkim.c

diff --git a/src/src/dkim.c b/src/src/dkim.c
index 87c9c9197..9e76c51a0 100644
--- a/src/src/dkim.c
+++ b/src/src/dkim.c
@@ -2,9 +2,10 @@
 *     Exim - an Internet mail transport agent    *
 *************************************************/
 
+/* Copyright (c) The Exim Maintainers 2020 - 2023 */
 /* Copyright (c) University of Cambridge, 1995 - 2018 */
-/* Copyright (c) The Exim Maintainers 2020 */
 /* See the file NOTICE for conditions of use and distribution. */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 
 /* Code for DKIM support. Other DKIM relevant code is in
    receive.c, transport.c and transports/smtp.c */
@@ -50,14 +51,11 @@ dkim_exim_query_dns_txt(const uschar * name)
 dns_answer * dnsa = store_get_dns_answer();
 dns_scan dnss;
 rmark reset_point = store_mark();
-gstring * g = string_get_tainted(256, TRUE);
+gstring * g = string_get_tainted(256, GET_TAINTED);
 
 lookup_dnssec_authenticated = NULL;
 if (dns_lookup(dnsa, name, T_TXT, NULL) != DNS_SUCCEED)
-  {
-  store_free_dns_answer(dnsa);
-  return NULL;	/*XXX better error detail?  logging? */
-  }
+  goto bad;
 
 /* Search for TXT record */
 
@@ -65,12 +63,8 @@ for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS);
      rr;
      rr = dns_next_rr(dnsa, &dnss, RESET_NEXT))
   if (rr->type == T_TXT)
-    {
-    int rr_offset = 0;
-
-    /* Copy record content to the answer buffer */
-
-    while (rr_offset < rr->size)
+    {			/* Copy record content to the answer buffer */
+    for (int rr_offset = 0; rr_offset < rr->size; )
       {
       uschar len = rr->data[rr_offset++];
 
@@ -81,7 +75,7 @@ for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS);
       rr_offset += len;
       }
 
-    /* check if this looks like a DKIM record */
+    /* Check if this looks like a DKIM record */
     if (Ustrncmp(g->s, "v=", 2) != 0 || strncasecmp(CS g->s, "v=dkim", 6) == 0)
       {
       store_free_dns_answer(dnsa);
@@ -89,7 +83,7 @@ for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS);
       return string_from_gstring(g);
       }
 
-    if (g) g->ptr = 0;		/* overwrite previous record */
+    gstring_reset(g);		/* overwrite previous record */
     }
 
 bad:
@@ -135,13 +129,16 @@ dkim_verify_ctx = pdkim_init_verify(&dkim_exim_query_dns_txt, dot_stuffing);
 dkim_collect_input = dkim_verify_ctx ? DKIM_MAX_SIGNATURES : 0;
 dkim_collect_error = NULL;
 
-/* Start feed up with any cached data */
-receive_get_cache();
+/* Start feed up with any cached data, but limited to message data */
+receive_get_cache(chunking_state == CHUNKING_LAST
+		  ? chunking_data_left : GETC_BUFFER_UNLIMITED);
 
 store_pool = dkim_verify_oldpool;
 }
 
 
+/* Submit a chunk of data for verification input.
+Only use the data when the feed is activated. */
 void
 dkim_exim_verify_feed(uschar * data, int len)
 {
@@ -292,7 +289,7 @@ else
       break;
     }
 
-log_write(0, LOG_MAIN, "%s", string_from_gstring(logmsg));
+log_write(0, LOG_MAIN, "%Y", logmsg);
 return;
 }
 
@@ -627,6 +624,7 @@ if (dkim->dot_stuffed)
 
 store_pool = POOL_MAIN;
 
+GET_OPTION("dkim_domain");
 if ((s = dkim->dkim_domain) && !(dkim_domain = expand_cstring(s)))
   /* expansion error, do not send message. */
   { errwhen = US"dkim_domain"; goto expand_bad; }
@@ -655,6 +653,7 @@ if (dkim_domain)
   /* Set $dkim_selector expansion variable to each selector in list,
   for this domain. */
 
+  GET_OPTION("dkim_selector");
   if (!(dkim_sel = expand_string(dkim->dkim_selector)))
     { errwhen = US"dkim_selector"; goto expand_bad; }
 
@@ -672,6 +671,7 @@ if (dkim_domain)
 
     /* Get canonicalization to use */
 
+    GET_OPTION("dkim_canon");
     dkim_canon_expanded = dkim->dkim_canon
       ? expand_string(dkim->dkim_canon) : US"relaxed";
     if (!dkim_canon_expanded)	/* expansion error, do not send message. */
@@ -689,6 +689,7 @@ if (dkim_domain)
       pdkim_canon = PDKIM_CANON_RELAXED;
       }
 
+    GET_OPTION("dkim_sign_headers");
     if (  dkim->dkim_sign_headers
        && !(dkim_sign_headers_expanded = expand_string(dkim->dkim_sign_headers)))
       { errwhen = US"dkim_sign_header"; goto expand_bad; }
@@ -696,6 +697,7 @@ if (dkim_domain)
 
     /* Get private key to use. */
 
+    GET_OPTION("dkim_private_key");
     if (!(dkim_private_key_expanded = expand_string(dkim->dkim_private_key)))
       { errwhen = US"dkim_private_key"; goto expand_bad; }
 
@@ -710,21 +712,28 @@ if (dkim_domain)
 	     expand_file_big_buffer(dkim_private_key_expanded)))
       goto bad;
 
+    GET_OPTION("dkim_hash");
     if (!(dkim_hash_expanded = expand_string(dkim->dkim_hash)))
       { errwhen = US"dkim_hash"; goto expand_bad; }
 
+    GET_OPTION("dkim_identity");
     if (dkim->dkim_identity)
       if (!(dkim_identity_expanded = expand_string(dkim->dkim_identity)))
 	{ errwhen = US"dkim_identity"; goto expand_bad; }
       else if (!*dkim_identity_expanded)
 	dkim_identity_expanded = NULL;
 
+    GET_OPTION("dkim_timestamps");
     if (dkim->dkim_timestamps)
       if (!(dkim_timestamps_expanded = expand_string(dkim->dkim_timestamps)))
 	{ errwhen = US"dkim_timestamps"; goto expand_bad; }
       else
-	xval = (tval = (unsigned long) time(NULL))
-	      + strtoul(CCS dkim_timestamps_expanded, NULL, 10);
+        {
+        tval = (unsigned long) time(NULL);
+        xval = strtoul(CCS dkim_timestamps_expanded, NULL, 10);
+        if (xval > 0)
+          xval += tval;
+        }
 
     if (!(sig = pdkim_init_sign(&dkim_sign_ctx, dkim_signing_domain,
 			  dkim_signing_selector,
@@ -744,6 +753,9 @@ if (dkim_domain)
     if (!pdkim_set_sig_bodyhash(&dkim_sign_ctx, sig))
       goto bad;
 
+    dkim_signing_record = string_append_listele(dkim_signing_record, ':', dkim_signing_domain);
+    dkim_signing_record = string_append_listele(dkim_signing_record, ':', dkim_signing_selector);
+
     if (!dkim_sign_ctx.sig)		/* link sig to context chain */
       dkim_sign_ctx.sig = sig;
     else
@@ -825,7 +837,7 @@ authres_dkim(gstring * g)
 {
 int start = 0;		/* compiler quietening */
 
-DEBUG(D_acl) start = g->ptr;
+DEBUG(D_acl) start = gstring_length(g);
 
 for (pdkim_signature * sig = dkim_signatures; sig; sig = sig->next)
   {
@@ -887,10 +899,10 @@ for (pdkim_signature * sig = dkim_signatures; sig; sig = sig->next)
   }
 
 DEBUG(D_acl)
-  if (g->ptr == start)
-    debug_printf("DKIM: no authres\n");
+  if (gstring_length(g) == start)
+    debug_printf("DKIM:\tno authres\n");
   else
-    debug_printf("DKIM: authres '%.*s'\n", g->ptr - start - 3, g->s + start + 3);
+    debug_printf("DKIM:\tauthres '%.*s'\n", g->ptr - start - 3, g->s + start + 3);
 return g;
 }