blob: df917583b6a789b9e4dcacea025e4925367b38a9 [file] [log] [blame]
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11003 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11005 * Rhosts or /etc/hosts.equiv authentication combined with RSA host
6 * authentication.
7 *
Damien Millere4340be2000-09-16 13:29:08 +11008 * 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".
Damien Miller95def091999-11-25 00:26:21 +110013 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100014
15#include "includes.h"
Damien Millerc5d86352002-02-05 12:13:41 +110016RCSID("$OpenBSD: auth-rh-rsa.c,v 1.28 2002/01/29 14:32:03 markus Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100017
18#include "packet.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100019#include "xmalloc.h"
20#include "uidswap.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000021#include "log.h"
Damien Miller32265091999-11-12 11:33:04 +110022#include "servconf.h"
Damien Miller450a7a12000-03-26 13:04:51 +100023#include "key.h"
24#include "hostfile.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000025#include "pathnames.h"
26#include "auth.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000027#include "canohost.h"
Damien Miller450a7a12000-03-26 13:04:51 +100028
Damien Miller5428f641999-11-25 11:54:57 +110029/*
30 * Tries to authenticate the user using the .rhosts file and the host using
31 * its host key. Returns true if authentication succeeds.
32 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100033
Damien Miller4af51302000-04-16 11:18:38 +100034int
Damien Millerd221ca62002-01-22 23:11:00 +110035auth_rhosts_rsa(struct passwd *pw, const char *client_user, Key *client_host_key)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100036{
Damien Miller95def091999-11-25 00:26:21 +110037 extern ServerOptions options;
38 const char *canonical_hostname;
39 HostStatus host_status;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100040
Damien Miller874d77b2000-10-14 16:23:11 +110041 debug("Trying rhosts with RSA host authentication for client user %.100s", client_user);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100042
Damien Millerd221ca62002-01-22 23:11:00 +110043 if (pw == NULL || client_host_key == NULL || client_host_key->rsa == NULL)
Damien Miller450a7a12000-03-26 13:04:51 +100044 return 0;
45
Damien Miller95def091999-11-25 00:26:21 +110046 /* Check if we would accept it using rhosts authentication. */
47 if (!auth_rhosts(pw, client_user))
48 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100049
Damien Miller33804262001-02-04 23:20:18 +110050 canonical_hostname = get_canonical_hostname(
Damien Millerc5d86352002-02-05 12:13:41 +110051 options.verify_reverse_mapping);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100052
Damien Miller450a7a12000-03-26 13:04:51 +100053 debug("Rhosts RSA authentication: canonical host %.900s", canonical_hostname);
54
Damien Millerd221ca62002-01-22 23:11:00 +110055 host_status = check_key_in_hostfiles(pw, client_host_key,
56 canonical_hostname, _PATH_SSH_SYSTEM_HOSTFILE,
Ben Lindstroma4789ef2001-06-25 04:40:49 +000057 options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE);
Damien Miller33e511e1999-11-11 11:43:13 +110058
Damien Miller95def091999-11-25 00:26:21 +110059 if (host_status != HOST_OK) {
60 debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
61 packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
62 return 0;
63 }
64 /* A matching host key was found and is known. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100065
Damien Miller95def091999-11-25 00:26:21 +110066 /* Perform the challenge-response dialog with the client for the host key. */
Damien Millerd221ca62002-01-22 23:11:00 +110067 if (!auth_rsa_challenge_dialog(client_host_key->rsa)) {
Damien Miller95def091999-11-25 00:26:21 +110068 log("Client on %.800s failed to respond correctly to host authentication.",
69 canonical_hostname);
70 return 0;
71 }
Damien Miller5428f641999-11-25 11:54:57 +110072 /*
73 * We have authenticated the user using .rhosts or /etc/hosts.equiv,
74 * and the host using RSA. We accept the authentication.
75 */
Damien Miller95def091999-11-25 00:26:21 +110076
77 verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
Damien Miller450a7a12000-03-26 13:04:51 +100078 pw->pw_name, client_user, canonical_hostname);
Damien Miller95def091999-11-25 00:26:21 +110079 packet_send_debug("Rhosts with RSA host authentication accepted.");
80 return 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100081}