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diff --git a/ChangeLog b/ChangeLog
index 38de846..1603a07 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,14 @@
+20140420
+ - djm@cvs.openbsd.org 2014/04/01 03:34:10
+ [sshconnect.c]
+ When using VerifyHostKeyDNS with a DNSSEC resolver, down-convert any
+ certificate keys to plain keys and attempt SSHFP resolution.
+
+ Prevents a server from skipping SSHFP lookup and forcing a new-hostkey
+ dialog by offering only certificate keys.
+
+ Reported by mcv21 AT cam.ac.uk
+
20140313
- (djm) Release OpenSSH 6.6
diff --git a/sshconnect.c b/sshconnect.c
index 394cca8..e636f33 100644
--- a/sshconnect.c
+++ b/sshconnect.c
@@ -1219,30 +1219,40 @@ verify_host_key(char *host, struct sockaddr *hostaddr, Key *host_key)
{
int flags = 0;
char *fp;
+ Key *plain = NULL;
fp = key_selected_fingerprint(host_key, SSH_FP_HEX);
debug("Server host key: %s %s%s", key_type(host_key),
key_fingerprint_prefix(), fp);
free(fp);
- /* XXX certs are not yet supported for DNS */
- if (!key_is_cert(host_key) && options.verify_host_key_dns &&
- verify_host_key_dns(host, hostaddr, host_key, &flags) == 0) {
- if (flags & DNS_VERIFY_FOUND) {
-
- if (options.verify_host_key_dns == 1 &&
- flags & DNS_VERIFY_MATCH &&
- flags & DNS_VERIFY_SECURE)
- return 0;
-
- if (flags & DNS_VERIFY_MATCH) {
- matching_host_key_dns = 1;
- } else {
- warn_changed_key(host_key);
- error("Update the SSHFP RR in DNS with the new "
- "host key to get rid of this message.");
+ if (options.verify_host_key_dns) {
+ /*
+ * XXX certs are not yet supported for DNS, so downgrade
+ * them and try the plain key.
+ */
+ plain = key_from_private(host_key);
+ if (key_is_cert(plain))
+ key_drop_cert(plain);
+ if (verify_host_key_dns(host, hostaddr, plain, &flags) == 0) {
+ if (flags & DNS_VERIFY_FOUND) {
+ if (options.verify_host_key_dns == 1 &&
+ flags & DNS_VERIFY_MATCH &&
+ flags & DNS_VERIFY_SECURE) {
+ key_free(plain);
+ return 0;
+ }
+ if (flags & DNS_VERIFY_MATCH) {
+ matching_host_key_dns = 1;
+ } else {
+ warn_changed_key(plain);
+ error("Update the SSHFP RR in DNS "
+ "with the new host key to get rid "
+ "of this message.");
+ }
}
}
+ key_free(plain);
}
return check_host_key(host, hostaddr, options.port, host_key, RDRW,