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authorColin Watson <cjwatson@debian.org>2014-02-09 16:10:01 +0000
committerColin Watson <cjwatson@debian.org>2017-03-29 01:39:47 +0100
commit1e06dfb99d3a59ef0b0a804ed1c2a590b3fab71c (patch)
treef6334f58466cfe559c8aebb39074bd7018b86ee9 /dns.c
parentce9a126fdaa8ef6488364107cc66d04ecabc8cc4 (diff)
Force use of DNSSEC even if "options edns0" isn't in resolv.conf
This allows SSHFP DNS records to be verified if glibc 2.11 is installed. Origin: vendor, https://cvs.fedoraproject.org/viewvc/F-12/openssh/openssh-5.2p1-edns.patch?revision=1.1&view=markup Bug: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=572049 Bug-Debian: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=572049 Last-Update: 2010-04-06 Patch-Name: dnssec-sshfp.patch
Diffstat (limited to 'dns.c')
-rw-r--r--dns.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/dns.c b/dns.c
index e813afeae..fce2e308f 100644
--- a/dns.c
+++ b/dns.c
@@ -206,6 +206,7 @@ verify_host_key_dns(const char *hostname, struct sockaddr *address,
206{ 206{
207 u_int counter; 207 u_int counter;
208 int result; 208 int result;
209 unsigned int rrset_flags = 0;
209 struct rrsetinfo *fingerprints = NULL; 210 struct rrsetinfo *fingerprints = NULL;
210 211
211 u_int8_t hostkey_algorithm; 212 u_int8_t hostkey_algorithm;
@@ -229,8 +230,19 @@ verify_host_key_dns(const char *hostname, struct sockaddr *address,
229 return -1; 230 return -1;
230 } 231 }
231 232
233 /*
234 * Original getrrsetbyname function, found on OpenBSD for example,
235 * doesn't accept any flag and prerequisite for obtaining AD bit in
236 * DNS response is set by "options edns0" in resolv.conf.
237 *
238 * Our version is more clever and use RRSET_FORCE_EDNS0 flag.
239 */
240#ifndef HAVE_GETRRSETBYNAME
241 rrset_flags |= RRSET_FORCE_EDNS0;
242#endif
232 result = getrrsetbyname(hostname, DNS_RDATACLASS_IN, 243 result = getrrsetbyname(hostname, DNS_RDATACLASS_IN,
233 DNS_RDATATYPE_SSHFP, 0, &fingerprints); 244 DNS_RDATATYPE_SSHFP, rrset_flags, &fingerprints);
245
234 if (result) { 246 if (result) {
235 verbose("DNS lookup error: %s", dns_result_totext(result)); 247 verbose("DNS lookup error: %s", dns_result_totext(result));
236 return -1; 248 return -1;