receive with DKIM

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

diff --git a/src/src/dkim.c b/src/src/dkim.c
index 349947ab1644c12a1abdc3aef2971ec8d56ce0f4..a09ec7ecae62d60c9a35dc4eb1d5427aa619d9a0 100644 (file)
--- a/src/src/dkim.c
+++ b/src/src/dkim.c
@@ -2,7 +2,7 @@
 *     Exim - an Internet mail transport agent    *
 *************************************************/
 
-/* Copyright (c) University of Cambridge, 1995 - 2015 */
+/* Copyright (c) University of Cambridge, 1995 - 2016 */
 /* See the file NOTICE for conditions of use and distribution. */
 
 /* Code for DKIM support. Other DKIM relevant code is in
@@ -14,6 +14,7 @@
 
 #include "pdkim/pdkim.h"
 
+int dkim_verify_oldpool;
 pdkim_ctx *dkim_verify_ctx = NULL;
 pdkim_signature *dkim_signatures = NULL;
 pdkim_signature *dkim_cur_sig = NULL;
@@ -66,9 +67,17 @@ pdkim_init();
 }
 
 
+
 void
 dkim_exim_verify_init(void)
 {
+/* There is a store-reset between header & body reception
+so cannot use the main pool. Any allocs done by Exim
+memory-handling must use the perm pool. */
+
+dkim_verify_oldpool = store_pool;
+store_pool = POOL_PERM;
+
 /* Free previous context if there is one */
 
 if (dkim_verify_ctx)
@@ -78,15 +87,22 @@ if (dkim_verify_ctx)
 
 dkim_verify_ctx = pdkim_init_verify(&dkim_exim_query_dns_txt);
 dkim_collect_input = !!dkim_verify_ctx;
+
+/* Start feed up with any cached data */
+receive_get_cache();
+
+store_pool = dkim_verify_oldpool;
 }
 
 
 void
 dkim_exim_verify_feed(uschar * data, int len)
 {
+store_pool = POOL_PERM;
 if (  dkim_collect_input
    && pdkim_feed(dkim_verify_ctx, (char *)data, len) != PDKIM_OK)
   dkim_collect_input = FALSE;
+store_pool = dkim_verify_oldpool;
 }
 
 
@@ -98,6 +114,8 @@ int dkim_signers_size = 0;
 int dkim_signers_ptr = 0;
 dkim_signers = NULL;
 
+store_pool = POOL_PERM;
+
 /* Delete eventual previous signature chain */
 
 dkim_signatures = NULL;
@@ -112,7 +130,7 @@ if (!dkim_collect_input)
             "DKIM: Error while running this message through validation,"
             " disabling signature verification.");
   dkim_disable_verify = TRUE;
-  return;
+  goto out;
   }
 
 dkim_collect_input = FALSE;
@@ -120,7 +138,7 @@ dkim_collect_input = FALSE;
 /* Finish DKIM operation and fetch link to signatures chain */
 
 if (pdkim_feed_finish(dkim_verify_ctx, &dkim_signatures) != PDKIM_OK)
-  return;
+  goto out;
 
 for (sig = dkim_signatures; sig; sig = sig->next)
   {
@@ -133,10 +151,12 @@ for (sig = dkim_signatures; sig; sig = sig->next)
        string_sprintf("d=%s s=%s c=%s/%s a=%s b=%d ",
              sig->domain,
              sig->selector,
-             sig->canon_headers == PDKIM_CANON_SIMPLE ?  "simple" : "relaxed",
-             sig->canon_body == PDKIM_CANON_SIMPLE ?  "simple" : "relaxed",
-             sig->algo == PDKIM_ALGO_RSA_SHA256 ?  "rsa-sha256" : "rsa-sha1",
-             sig->sigdata.len * 8
+             sig->canon_headers == PDKIM_CANON_SIMPLE ? "simple" : "relaxed",
+             sig->canon_body == PDKIM_CANON_SIMPLE ? "simple" : "relaxed",
+             sig->algo == PDKIM_ALGO_RSA_SHA256
+             ? "rsa-sha256"
+             : sig->algo == PDKIM_ALGO_RSA_SHA1 ? "rsa-sha1" : "err",
+             (int)sig->sigdata.len > -1 ? sig->sigdata.len * 8 : 0
              ),
 
        sig->identity ? string_sprintf("i=%s ", sig->identity) : US"",
@@ -171,6 +191,16 @@ for (sig = dkim_signatures; sig; sig = sig->next)
                       "syntax error in public key record]");
          break;
 
+        case PDKIM_VERIFY_INVALID_SIGNATURE_ERROR:
+          logmsg = string_append(logmsg, &size, &ptr, 1,
+                       "signature tag missing or invalid]");
+          break;
+
+        case PDKIM_VERIFY_INVALID_DKIM_VERSION:
+          logmsg = string_append(logmsg, &size, &ptr, 1,
+                       "unsupported DKIM version]");
+          break;
+
        default:
          logmsg = string_append(logmsg, &size, &ptr, 1,
                        "unspecified problem]");
@@ -228,6 +258,9 @@ if (dkim_signers)
   if (Ustrlen(dkim_signers) > 0)
   dkim_signers[Ustrlen(dkim_signers) - 1] = '\0';
   }
+
+out:
+store_pool = dkim_verify_oldpool;
 }