1 /* $OpenBSD: auth-rh-rsa.c,v 1.44 2014/07/15 15:54:14 millert Exp $ */
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
6 * Rhosts or /etc/hosts.equiv authentication combined with RSA host
9 * As far as I am concerned, the code I have written for this software
10 * can be used freely for any purpose. Any derived versions of this
11 * software must be clearly marked as such, and if the derived work is
12 * incompatible with the protocol description in the RFC file, it must be
13 * called by a name other than "ssh" or "Secure Shell".
18 #include <sys/types.h>
31 #include "pathnames.h"
37 #include "monitor_wrap.h"
40 extern ServerOptions options;
43 auth_rhosts_rsa_key_allowed(struct passwd *pw, char *cuser, char *chost,
46 HostStatus host_status;
48 if (auth_key_is_revoked(client_host_key))
51 /* Check if we would accept it using rhosts authentication. */
52 if (!auth_rhosts(pw, cuser))
55 host_status = check_key_in_hostfiles(pw, client_host_key,
56 chost, _PATH_SSH_SYSTEM_HOSTFILE,
57 options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE);
59 return (host_status == HOST_OK);
63 * Tries to authenticate the user using the .rhosts file and the host using
64 * its host key. Returns true if authentication succeeds.
67 auth_rhosts_rsa(Authctxt *authctxt, char *cuser, Key *client_host_key)
70 struct passwd *pw = authctxt->pw;
72 debug("Trying rhosts with RSA host authentication for client user %.100s",
75 if (!authctxt->valid || client_host_key == NULL ||
76 client_host_key->rsa == NULL)
79 chost = (char *)get_canonical_hostname(options.use_dns);
80 debug("Rhosts RSA authentication: canonical host %.900s", chost);
82 if (!PRIVSEP(auth_rhosts_rsa_key_allowed(pw, cuser, chost, client_host_key))) {
83 debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
84 packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
87 /* A matching host key was found and is known. */
89 /* Perform the challenge-response dialog with the client for the host key. */
90 if (!auth_rsa_challenge_dialog(client_host_key)) {
91 logit("Client on %.800s failed to respond correctly to host authentication.",
96 * We have authenticated the user using .rhosts or /etc/hosts.equiv,
97 * and the host using RSA. We accept the authentication.
100 verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
101 pw->pw_name, cuser, chost);
102 packet_send_debug("Rhosts with RSA host authentication accepted.");