I've just thrown together a patch. It compiles but is otherwise
entirely untested! I'm interested in comments like `No, that's the
wrong fix: you should do mumble instead.'
diff --git a/sshconnect.c b/sshconnect.c
index 87c3770..dfe44e4 100644
--- a/sshconnect.c
+++ b/sshconnect.c
@@ -1218,36 +1218,62 @@ fail:
return -1;
}
+static int
+check_host_key_sshfp(char *host, struct sockaddr *hostaddr, Key *host_key)
+{
+ int rc = -1;
+ int flags = 0;
+ Key *raw_key = NULL;
+
+ if (!options.verify_host_key_dns)
+ goto done;
+
+ /* XXX certs are not yet supported for DNS; try looking the raw key
+ * up in the DNS anyway.
+ */
+ if (key_is_cert(host_key)) {
+ raw_key = key_from_private(host_key);
+ if (key_drop_cert(raw_key))
+ fatal("Couldn't drop certificate");
+ host_key = raw_key;
+ }
+
+ if (verify_host_key_dns(host, hostaddr, host_key, &flags))
+ goto done;
+
+ if (flags & DNS_VERIFY_FOUND) {
+
+ if (options.verify_host_key_dns == 1 &&
+ flags & DNS_VERIFY_MATCH &&
+ flags & DNS_VERIFY_SECURE) {
+ rc = 0;
+ } else 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.");
+ }
+ }
+
+done:
+ if (raw_key)
+ key_free(raw_key);
+ return rc;
+}
+
/* returns 0 if key verifies or -1 if key does NOT verify */
int
verify_host_key(char *host, struct sockaddr *hostaddr, Key *host_key)
{
- int flags = 0;
char *fp;
fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX);
debug("Server host key: %s %s", key_type(host_key), 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 (check_host_key_sshfp(host, hostaddr, host_key) == 0)
+ return 0;
return check_host_key(host, hostaddr, options.port, host_key, RDRW,
options.user_hostfiles, options.num_user_hostfiles,
-- [mdw]
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