2 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * Rhosts or /etc/hosts.equiv authentication combined with RSA host
8 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
16 RCSID("$OpenBSD: auth-rh-rsa.c,v 1.37 2003/11/04 08:54:09 djm Exp $");
24 #include "pathnames.h"
28 #include "monitor_wrap.h"
31 extern ServerOptions options;
34 auth_rhosts_rsa_key_allowed(struct passwd *pw, char *cuser, char *chost,
37 HostStatus host_status;
39 /* Check if we would accept it using rhosts authentication. */
40 if (!auth_rhosts(pw, cuser))
43 host_status = check_key_in_hostfiles(pw, client_host_key,
44 chost, _PATH_SSH_SYSTEM_HOSTFILE,
45 options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE);
47 return (host_status == HOST_OK);
51 * Tries to authenticate the user using the .rhosts file and the host using
52 * its host key. Returns true if authentication succeeds.
55 auth_rhosts_rsa(Authctxt *authctxt, char *cuser, Key *client_host_key)
58 struct passwd *pw = authctxt->pw;
60 debug("Trying rhosts with RSA host authentication for client user %.100s",
63 if (!authctxt->valid || client_host_key == NULL ||
64 client_host_key->rsa == NULL)
67 chost = (char *)get_canonical_hostname(options.use_dns);
68 debug("Rhosts RSA authentication: canonical host %.900s", chost);
70 if (!PRIVSEP(auth_rhosts_rsa_key_allowed(pw, cuser, chost, client_host_key))) {
71 debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
72 packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
75 /* A matching host key was found and is known. */
77 /* Perform the challenge-response dialog with the client for the host key. */
78 if (!auth_rsa_challenge_dialog(client_host_key)) {
79 logit("Client on %.800s failed to respond correctly to host authentication.",
84 * We have authenticated the user using .rhosts or /etc/hosts.equiv,
85 * and the host using RSA. We accept the authentication.
88 verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
89 pw->pw_name, cuser, chost);
90 packet_send_debug("Rhosts with RSA host authentication accepted.");