diff options
| author | djm@openbsd.org <djm@openbsd.org> | 2022-10-24 22:43:36 +0000 |
|---|---|---|
| committer | Damien Miller <djm@mindrot.org> | 2022-10-25 10:16:35 +1100 |
| commit | 445363433ba20b8a3e655b113858c836da46a1cb (patch) | |
| tree | 69b808a90d727bc1e2ea69259294dc8e3bf25d6a /sshconnect.c | |
| parent | 7190154de2c9fe135f0cc1ad349cb2fa45152b89 (diff) | |
| download | openssh-git-445363433ba20b8a3e655b113858c836da46a1cb.tar.gz | |
upstream: Be more paranoid with host/domain names coming from the
never write a name with bad characters to a known_hosts file.
reported by David Leadbeater, ok deraadt@
OpenBSD-Commit-ID: ba9b25fa8b5490b49398471e0c9657b0cbc7a5ad
Diffstat (limited to 'sshconnect.c')
| -rw-r--r-- | sshconnect.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/sshconnect.c b/sshconnect.c index 7b3f260e..b6781261 100644 --- a/sshconnect.c +++ b/sshconnect.c @@ -1,4 +1,4 @@ -/* $OpenBSD: sshconnect.c,v 1.358 2022/08/26 08:16:27 djm Exp $ */ +/* $OpenBSD: sshconnect.c,v 1.359 2022/10/24 22:43:36 djm Exp $ */ /* * Author: Tatu Ylonen <ylo@cs.hut.fi> * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland @@ -935,7 +935,7 @@ check_host_key(char *hostname, const struct ssh_conn_info *cinfo, char *ip = NULL, *host = NULL; char hostline[1000], *hostp, *fp, *ra; char msg[1024]; - const char *type, *fail_reason; + const char *type, *fail_reason = NULL; const struct hostkey_entry *host_found = NULL, *ip_found = NULL; int len, cancelled_forwarding = 0, confirmed; int local = sockaddr_is_local(hostaddr); @@ -1018,6 +1018,13 @@ check_host_key(char *hostname, const struct ssh_conn_info *cinfo, (host_found != NULL && host_found->note != 0))) readonly = RDONLY; + /* Don't ever try to write an invalid name to a known hosts file */ + if (!valid_domain(hostname, 0, &fail_reason)) { + debug_f("invalid hostname \"%s\"; will not record: %s", + hostname, fail_reason); + readonly = RDONLY; + } + /* * Also perform check for the ip address, skip the check if we are * localhost, looking for a certificate, or the hostname was an ip |