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 1.31 2002/03/16 17:22:09 markus Exp $");
24 #include "pathnames.h"
29 extern ServerOptions options;
32 * Tries to authenticate the user using the .rhosts file and the host using
33 * its host key. Returns true if authentication succeeds.
37 auth_rhosts_rsa_key_allowed(struct passwd *pw, char *cuser, char *chost,
40 HostStatus host_status;
42 /* Check if we would accept it using rhosts authentication. */
43 if (!auth_rhosts(pw, cuser))
46 host_status = check_key_in_hostfiles(pw, client_host_key,
47 chost, _PATH_SSH_SYSTEM_HOSTFILE,
48 options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE);
50 return (host_status == HOST_OK);
54 * Tries to authenticate the user using the .rhosts file and the host using
55 * its host key. Returns true if authentication succeeds.
58 auth_rhosts_rsa(struct passwd *pw, char *cuser, Key *client_host_key)
62 debug("Trying rhosts with RSA host authentication for client user %.100s",
65 if (pw == NULL || client_host_key == NULL ||
66 client_host_key->rsa == NULL)
69 chost = (char *)get_canonical_hostname(options.verify_reverse_mapping);
70 debug("Rhosts RSA authentication: canonical host %.900s", chost);
72 if (!auth_rhosts_rsa_key_allowed(pw, cuser, chost, client_host_key)) {
73 debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
74 packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
77 /* A matching host key was found and is known. */
79 /* Perform the challenge-response dialog with the client for the host key. */
80 if (!auth_rsa_challenge_dialog(client_host_key)) {
81 log("Client on %.800s failed to respond correctly to host authentication.",
86 * We have authenticated the user using .rhosts or /etc/hosts.equiv,
87 * and the host using RSA. We accept the authentication.
90 verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
91 pw->pw_name, cuser, chost);
92 packet_send_debug("Rhosts with RSA host authentication accepted.");