DKIM: Ignore non-DKIM TXT records in DNS response. Bug 2207

diff --git a/src/src/dkim.c b/src/src/dkim.c
index 5e97c1b79cbea1081635698c570014f77e7cfc89..9731a63d9447f6632f89da2965d5c877f157b2f8 100644 (file)
--- a/src/src/dkim.c
+++ b/src/src/dkim.c
@@ -73,6 +73,9 @@ for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
       if (answer_offset >= PDKIM_DNS_TXT_MAX_RECLEN)
        return PDKIM_FAIL;      /*XXX better error detail?  logging? */
       }
+
+    /* check if this looks like a DKIM record */
+    if (strncasecmp(answer, "v=dkim", 6) != 0) continue;
     return PDKIM_OK;
     }
 
@@ -148,7 +151,7 @@ if (!(s = sig->domain)) s = US"<UNSET>";
 logmsg = string_append(logmsg, 2, "d=", s);
 if (!(s = sig->selector)) s = US"<UNSET>";
 logmsg = string_append(logmsg, 2, " s=", s);
-logmsg = string_append(logmsg, 7, 
+logmsg = string_append(logmsg, 7,
 " c=", sig->canon_headers == PDKIM_CANON_SIMPLE ? "simple" : "relaxed",
 "/",   sig->canon_body    == PDKIM_CANON_SIMPLE ? "simple" : "relaxed",
 " a=", dkim_sig_to_a_tag(sig),
@@ -371,7 +374,7 @@ for (sig = dkim_signatures; sig; sig = sig->next)
 
     dkim_verify_status = dkim_exim_expand_query(DKIM_VERIFY_STATUS);
     dkim_verify_reason = dkim_exim_expand_query(DKIM_VERIFY_REASON);
-    
+
     if ((rc = dkim_acl_call(id, res_ptr, user_msgptr, log_msgptr)) != OK)
       return rc;
     }

diff --git a/test/confs/4504 b/test/confs/4504
new file mode 120000 (symlink)
index 0000000..da89833
--- /dev/null
+++ b/test/confs/4504
@@ -0,0 +1 @@
+4503
\ No newline at end of file

diff --git a/test/dnszones-src/db.test.ex b/test/dnszones-src/db.test.ex
index 73db57f9ce60cf8d0649d7e5174a21c1bdfc7301..18a2fe00afed6f8ab275fbd09cef83b52dd0e1ff 100644 (file)
--- a/test/dnszones-src/db.test.ex
+++ b/test/dnszones-src/db.test.ex
@@ -505,5 +505,7 @@ ses._domainkey TXT "v=DKIM1; n=halfkilo; p=MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAL6eA
 ses_sha1._domainkey TXT "v=DKIM1; h=sha1; p=MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAL6eAQxd9didJ0/+05iDwJOqT6ly826Vi8aGPecsBiYK5/tAT97fxXk+dPWMZp9kQxtknEzYjYjAydzf+HQ2yJMCAwEAAQ=="
 ses_sha256._domainkey TXT "v=DKIM1; h=sha256; p=MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAL6eAQxd9didJ0/+05iDwJOqT6ly826Vi8aGPecsBiYK5/tAT97fxXk+dPWMZp9kQxtknEzYjYjAydzf+HQ2yJMCAwEAAQ=="
 
+sel2._domainkey TXT "v=spf1 mx a include:spf.nl2go.com -all"
+sel2._domainkey TXT "v=DKIM1; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDXRFf+VhT+lCgFhhSkinZKcFNeRzjYdW8vT29Rbb3NadvTFwAd+cVLPFwZL8H5tUD/7JbUPqNTCPxmpgIL+V5T4tEZMorHatvvUM2qfcpQ45IfsZ+YdhbIiAslHCpy4xNxIR3zylgqRUF4+Dtsaqy3a5LhwMiKCLrnzhXk1F1hxwIDAQAB"
 
 ; End

diff --git a/test/log/4504 b/test/log/4504
new file mode 100644 (file)
index 0000000..a4dee26
--- /dev/null
+++ b/test/log/4504
@@ -0,0 +1,6 @@
+
+******** SERVER ********
+1999-03-02 09:44:33 exim x.yz daemon started: pid=pppp, no queue runs, listening for SMTP on port 1225
+1999-03-02 09:44:33 10HmaX-0005vi-00 signer: test.ex bits: 1024
+1999-03-02 09:44:33 10HmaX-0005vi-00 DKIM: d=test.ex s=sel2 c=simple/simple a=rsa-sha512 b=1024 [verification failed - signature did not verify (headers probably modified in transit)]
+1999-03-02 09:44:33 10HmaX-0005vi-00 <= CALLER@bloggs.com H=(xxx) [127.0.0.1] P=smtp S=sss id=qwerty1234@disco-zombie.net

diff --git a/test/scripts/4500-DKIM/4504 b/test/scripts/4500-DKIM/4504
new file mode 100644 (file)
index 0000000..5de9e79
--- /dev/null
+++ b/test/scripts/4500-DKIM/4504
@@ -0,0 +1,45 @@
+# DKIM verify, sha512
+#
+exim -DSERVER=server -bd -oX PORT_D
+****
+#
+# This should pass, only Mail::DKIM::Signer does not handle rsa-sha512.
+#  - sha512, 1024b
+# Mail original in aux-fixed/4500.msg1.txt
+# Sig generated by: perl aux-fixed/dkim/sign.pl --algorithm=rsa-sha512 \
+#                      --method=simple/simple < aux-fixed/4500.msg1.txt
+#
+# TODO - until we have that we can only test internal consistency,
+# signing vs. verification.
+#
+client 127.0.0.1 PORT_D
+??? 220
+HELO xxx
+??? 250
+MAIL FROM:<CALLER@bloggs.com>
+??? 250
+RCPT TO:<a@test.ex>
+??? 250
+DATA
+??? 354
+DKIM-Signature: v=1; a=rsa-sha512; c=simple/simple; d=test.ex; h=from:to
+       :date:message-id:subject; s=sel2; bh=3UbbJTudPxmejzh7U1Zg33U3QT+1
+       6kfV2eOTvMeiEis=; b=xQSD/JMqz0C+xKf0A1NTkPTbkDuDdJbpBuyjjT9iYvyP
+       Zez+xl0TkoPobFGVa6EN8+ZeYV18zjifhtWYLSsNmPinUtcpKQLG1zxAKmmS0JEh
+       +qihlWbeGJ5+tK588ugUzXHPj+4JBW0H6kxHvdH0l2SlQE5xs/cdggnx5QX5USY=
+From: mrgus@text.ex
+To: bakawolf@yahoo.com
+Date: Thu, 19 Nov 2015 17:00:07 -0700
+Message-ID: <qwerty1234@disco-zombie.net>
+Subject: simple test
+
+This is a simple test.
+.
+??? 250
+QUIT
+??? 221
+****
+#
+killdaemon
+no_stdout_check
+no_msglog_check