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 1.26 2001/11/07 22:41:51 markus Exp $");
25 #include "pathnames.h"
30 * Tries to authenticate the user using the .rhosts file and the host using
31 * its host key. Returns true if authentication succeeds.
35 auth_rhosts_rsa(struct passwd *pw, const char *client_user, RSA *client_host_key)
37 extern ServerOptions options;
38 const char *canonical_hostname;
39 HostStatus host_status;
42 debug("Trying rhosts with RSA host authentication for client user %.100s", client_user);
44 if (pw == NULL || client_host_key == NULL)
47 /* Check if we would accept it using rhosts authentication. */
48 if (!auth_rhosts(pw, client_user))
51 canonical_hostname = get_canonical_hostname(
52 options.reverse_mapping_check);
54 debug("Rhosts RSA authentication: canonical host %.900s", canonical_hostname);
56 /* wrap the RSA key into a 'generic' key */
57 client_key = key_new(KEY_RSA1);
58 BN_copy(client_key->rsa->e, client_host_key->e);
59 BN_copy(client_key->rsa->n, client_host_key->n);
61 host_status = check_key_in_hostfiles(pw, client_key, canonical_hostname,
62 _PATH_SSH_SYSTEM_HOSTFILE,
63 options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE);
67 if (host_status != HOST_OK) {
68 debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
69 packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
72 /* A matching host key was found and is known. */
74 /* Perform the challenge-response dialog with the client for the host key. */
75 if (!auth_rsa_challenge_dialog(client_host_key)) {
76 log("Client on %.800s failed to respond correctly to host authentication.",
81 * We have authenticated the user using .rhosts or /etc/hosts.equiv,
82 * and the host using RSA. We accept the authentication.
85 verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
86 pw->pw_name, client_user, canonical_hostname);
87 packet_send_debug("Rhosts with RSA host authentication accepted.");