| /* |
| * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| * All rights reserved |
| * Rhosts or /etc/hosts.equiv authentication combined with RSA host |
| * authentication. |
| * |
| * As far as I am concerned, the code I have written for this software |
| * can be used freely for any purpose. Any derived versions of this |
| * software must be clearly marked as such, and if the derived work is |
| * incompatible with the protocol description in the RFC file, it must be |
| * called by a name other than "ssh" or "Secure Shell". |
| */ |
| |
| #include "includes.h" |
| RCSID("$OpenBSD: auth-rh-rsa.c,v 1.32 2002/03/18 17:50:31 provos Exp $"); |
| |
| #include "packet.h" |
| #include "uidswap.h" |
| #include "log.h" |
| #include "servconf.h" |
| #include "key.h" |
| #include "hostfile.h" |
| #include "pathnames.h" |
| #include "auth.h" |
| #include "canohost.h" |
| |
| #include "monitor_wrap.h" |
| |
| /* import */ |
| extern ServerOptions options; |
| |
| /* |
| * Tries to authenticate the user using the .rhosts file and the host using |
| * its host key. Returns true if authentication succeeds. |
| */ |
| |
| int |
| auth_rhosts_rsa_key_allowed(struct passwd *pw, char *cuser, char *chost, |
| Key *client_host_key) |
| { |
| HostStatus host_status; |
| |
| /* Check if we would accept it using rhosts authentication. */ |
| if (!auth_rhosts(pw, cuser)) |
| return 0; |
| |
| host_status = check_key_in_hostfiles(pw, client_host_key, |
| chost, _PATH_SSH_SYSTEM_HOSTFILE, |
| options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE); |
| |
| return (host_status == HOST_OK); |
| } |
| |
| /* |
| * Tries to authenticate the user using the .rhosts file and the host using |
| * its host key. Returns true if authentication succeeds. |
| */ |
| int |
| auth_rhosts_rsa(struct passwd *pw, char *cuser, Key *client_host_key) |
| { |
| char *chost; |
| |
| debug("Trying rhosts with RSA host authentication for client user %.100s", |
| cuser); |
| |
| if (pw == NULL || client_host_key == NULL || |
| client_host_key->rsa == NULL) |
| return 0; |
| |
| chost = (char *)get_canonical_hostname(options.verify_reverse_mapping); |
| debug("Rhosts RSA authentication: canonical host %.900s", chost); |
| |
| if (!PRIVSEP(auth_rhosts_rsa_key_allowed(pw, cuser, chost, client_host_key))) { |
| debug("Rhosts with RSA host authentication denied: unknown or invalid host key"); |
| packet_send_debug("Your host key cannot be verified: unknown or invalid host key."); |
| return 0; |
| } |
| /* A matching host key was found and is known. */ |
| |
| /* Perform the challenge-response dialog with the client for the host key. */ |
| if (!auth_rsa_challenge_dialog(client_host_key)) { |
| log("Client on %.800s failed to respond correctly to host authentication.", |
| chost); |
| return 0; |
| } |
| /* |
| * We have authenticated the user using .rhosts or /etc/hosts.equiv, |
| * and the host using RSA. We accept the authentication. |
| */ |
| |
| verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.", |
| pw->pw_name, cuser, chost); |
| packet_send_debug("Rhosts with RSA host authentication accepted."); |
| return 1; |
| } |