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resolv: Implement trust-ad option for /etc/resolv.conf [BZ #20358]

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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
This commit is contained in:
Florian Weimer
2019-10-30 17:26:58 +01:00
parent 4a2ab5843a
commit 446997ff14
11 changed files with 253 additions and 1 deletions
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resolv/resolv.h
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@@ -131,6 +131,7 @@ struct res_sym {
#define RES_NOTLDQUERY 0x01000000 /* Do not look up unqualified name
as a TLD. */
#define RES_NORELOAD 0x02000000 /* No automatic configuration reload. */
#define RES_TRUSTAD 0x04000000 /* Request AD bit, keep it in responses. */
#define RES_DEFAULT (RES_RECURSE|RES_DEFNAMES|RES_DNSRCH)