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 1.24 2001/06/23 00:20:57 markus Exp $");
25 #include "pathnames.h"
27 #include "tildexpand.h"
31 * Tries to authenticate the user using the .rhosts file and the host using
32 * its host key. Returns true if authentication succeeds.
36 auth_rhosts_rsa(struct passwd *pw, const char *client_user, RSA *client_host_key)
38 extern ServerOptions options;
39 const char *canonical_hostname;
40 HostStatus host_status;
43 debug("Trying rhosts with RSA host authentication for client user %.100s", client_user);
45 if (pw == NULL || client_host_key == NULL)
48 /* Check if we would accept it using rhosts authentication. */
49 if (!auth_rhosts(pw, client_user))
52 canonical_hostname = get_canonical_hostname(
53 options.reverse_mapping_check);
55 debug("Rhosts RSA authentication: canonical host %.900s", canonical_hostname);
57 /* wrap the RSA key into a 'generic' key */
58 client_key = key_new(KEY_RSA1);
59 BN_copy(client_key->rsa->e, client_host_key->e);
60 BN_copy(client_key->rsa->n, client_host_key->n);
62 host_status = check_key_in_hostfiles(pw, client_key, canonical_hostname,
63 _PATH_SSH_SYSTEM_HOSTFILE,
64 options.ignore_user_known_hosts ? _PATH_SSH_USER_HOSTFILE : NULL);
68 if (host_status != HOST_OK) {
69 debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
70 packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
73 /* A matching host key was found and is known. */
75 /* Perform the challenge-response dialog with the client for the host key. */
76 if (!auth_rsa_challenge_dialog(client_host_key)) {
77 log("Client on %.800s failed to respond correctly to host authentication.",
82 * We have authenticated the user using .rhosts or /etc/hosts.equiv,
83 * and the host using RSA. We accept the authentication.
86 verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
87 pw->pw_name, client_user, canonical_hostname);
88 packet_send_debug("Rhosts with RSA host authentication accepted.");