]> andersk Git - gssapi-openssh.git/blame - openssh/auth-rh-rsa.c
Import of openssh-SNAP-20040105
[gssapi-openssh.git] / openssh / auth-rh-rsa.c
CommitLineData
3c0ef626 1/*
2 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
5 * Rhosts or /etc/hosts.equiv authentication combined with RSA host
6 * authentication.
7 *
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".
13 */
14
15#include "includes.h"
12408a1b 16RCSID("$OpenBSD: auth-rh-rsa.c,v 1.37 2003/11/04 08:54:09 djm Exp $");
3c0ef626 17
18#include "packet.h"
3c0ef626 19#include "uidswap.h"
20#include "log.h"
21#include "servconf.h"
22#include "key.h"
23#include "hostfile.h"
24#include "pathnames.h"
25#include "auth.h"
26#include "canohost.h"
27
700318f3 28#include "monitor_wrap.h"
29
30/* import */
31extern ServerOptions options;
3c0ef626 32
33int
700318f3 34auth_rhosts_rsa_key_allowed(struct passwd *pw, char *cuser, char *chost,
35 Key *client_host_key)
3c0ef626 36{
3c0ef626 37 HostStatus host_status;
3c0ef626 38
3c0ef626 39 /* Check if we would accept it using rhosts authentication. */
700318f3 40 if (!auth_rhosts(pw, cuser))
3c0ef626 41 return 0;
42
e9a17296 43 host_status = check_key_in_hostfiles(pw, client_host_key,
700318f3 44 chost, _PATH_SSH_SYSTEM_HOSTFILE,
3c0ef626 45 options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE);
46
700318f3 47 return (host_status == HOST_OK);
48}
49
50/*
51 * Tries to authenticate the user using the .rhosts file and the host using
52 * its host key. Returns true if authentication succeeds.
53 */
54int
12408a1b 55auth_rhosts_rsa(Authctxt *authctxt, char *cuser, Key *client_host_key)
700318f3 56{
57 char *chost;
12408a1b 58 struct passwd *pw = authctxt->pw;
700318f3 59
60 debug("Trying rhosts with RSA host authentication for client user %.100s",
61 cuser);
62
12408a1b 63 if (!authctxt->valid || client_host_key == NULL ||
700318f3 64 client_host_key->rsa == NULL)
65 return 0;
66
0fff78ff 67 chost = (char *)get_canonical_hostname(options.use_dns);
700318f3 68 debug("Rhosts RSA authentication: canonical host %.900s", chost);
69
70 if (!PRIVSEP(auth_rhosts_rsa_key_allowed(pw, cuser, chost, client_host_key))) {
3c0ef626 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.");
73 return 0;
74 }
75 /* A matching host key was found and is known. */
76
77 /* Perform the challenge-response dialog with the client for the host key. */
700318f3 78 if (!auth_rsa_challenge_dialog(client_host_key)) {
0fff78ff 79 logit("Client on %.800s failed to respond correctly to host authentication.",
700318f3 80 chost);
3c0ef626 81 return 0;
82 }
83 /*
84 * We have authenticated the user using .rhosts or /etc/hosts.equiv,
85 * and the host using RSA. We accept the authentication.
86 */
87
88 verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
700318f3 89 pw->pw_name, cuser, chost);
3c0ef626 90 packet_send_debug("Rhosts with RSA host authentication accepted.");
91 return 1;
92}
This page took 0.064201 seconds and 5 git commands to generate.