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authorFlorian Weimer <fweimer@redhat.com>2019-10-30 17:26:58 +0100
committerFlorian Weimer <fweimer@redhat.com>2019-11-27 20:54:37 +0100
commit446997ff1433d33452b81dfa9e626b8dccf101a4 (patch)
tree9a0e13fb7ca042a6f05fa9310f862c494580da80 /support
parent4a2ab5843a5cc4a5db1b3b79916a520ea8b115dc (diff)
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resolv: Implement trust-ad option for /etc/resolv.conf [BZ #20358]
This introduces a concept of trusted name servers, for which the
AD bit is passed through to applications.  For untrusted name
servers (the default), the AD bit in responses are cleared, to
provide a safe default.

This approach is very similar to the one suggested by Pavel Šimerda
in <https://bugzilla.redhat.com/show_bug.cgi?id=1164339#c15>.

The DNS test framework in support/ is enhanced with support for
setting the AD bit in responses.

Tested on x86_64-linux-gnu.

Change-Id: Ibfe0f7c73ea221c35979842c5c3b6ed486495ccc
Diffstat (limited to 'support')
-rw-r--r--support/resolv_test.c2
-rw-r--r--support/resolv_test.h3
2 files changed, 5 insertions, 0 deletions
diff --git a/support/resolv_test.c b/support/resolv_test.c
index aeca519ee3..b1c745dc8c 100644
--- a/support/resolv_test.c
+++ b/support/resolv_test.c
@@ -182,6 +182,8 @@ resolv_response_init (struct resolv_response_builder *b,
   if (flags.tc)
     b->buffer[2] |= 0x02;
   b->buffer[3] = 0x80 | flags.rcode; /* Always set RA.  */
+  if (flags.ad)
+    b->buffer[3] |= 0x20;
 
   /* Fill in the initial section count values.  */
   b->buffer[4] = flags.qdcount >> 8;
diff --git a/support/resolv_test.h b/support/resolv_test.h
index e36e3e3ae0..02a11bd712 100644
--- a/support/resolv_test.h
+++ b/support/resolv_test.h
@@ -134,6 +134,9 @@ struct resolv_response_flags
   /* If true, the TC (truncation) flag will be set.  */
   bool tc;
 
+  /* If true, the AD (authenticated data) flag will be set.  */
+  bool ad;
+
   /* Initial section count values.  Can be used to artificially
      increase the counts, for malformed packet testing.*/
   unsigned short qdcount;