Return to auth-rh-rsa.c CVS log

Up to [local] / src / usr.bin / ssh

Annotation of src/usr.bin/ssh/auth-rh-rsa.c, Revision 1.41

1.41    ! stevesk     1: /* $OpenBSD: auth-rh-rsa.c,v 1.40 2006/03/25 13:17:01 djm Exp $ */
1.1       provos      2: /*
1.9       deraadt     3:  * Author: Tatu Ylonen <ylo@cs.hut.fi>
                      4:  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
                      5:  *                    All rights reserved
                      6:  * Rhosts or /etc/hosts.equiv authentication combined with RSA host
                      7:  * authentication.
                      8:  *
1.15      deraadt     9:  * As far as I am concerned, the code I have written for this software
                     10:  * can be used freely for any purpose.  Any derived versions of this
                     11:  * software must be clearly marked as such, and if the derived work is
                     12:  * incompatible with the protocol description in the RFC file, it must be
                     13:  * called by a name other than "ssh" or "Secure Shell".
1.9       deraadt    14:  */
1.1       provos     15:
                     16: #include "includes.h"
1.41    ! stevesk    17:
        !            18: #include <sys/types.h>
        !            19:
        !            20: #include <pwd.h>
1.1       provos     21:
                     22: #include "packet.h"
                     23: #include "uidswap.h"
1.21      markus     24: #include "log.h"
1.4       markus     25: #include "servconf.h"
1.11      markus     26: #include "key.h"
                     27: #include "hostfile.h"
1.20      markus     28: #include "pathnames.h"
1.21      markus     29: #include "auth.h"
                     30: #include "canohost.h"
1.11      markus     31:
1.32      provos     32: #include "monitor_wrap.h"
                     33:
1.31      markus     34: /* import */
                     35: extern ServerOptions options;
1.1       provos     36:
1.13      markus     37: int
1.31      markus     38: auth_rhosts_rsa_key_allowed(struct passwd *pw, char *cuser, char *chost,
                     39:     Key *client_host_key)
1.1       provos     40: {
1.8       markus     41:        HostStatus host_status;
                     42:
1.31      markus     43:        /* Check if we would accept it using rhosts authentication. */
                     44:        if (!auth_rhosts(pw, cuser))
                     45:                return 0;
1.8       markus     46:
1.31      markus     47:        host_status = check_key_in_hostfiles(pw, client_host_key,
                     48:            chost, _PATH_SSH_SYSTEM_HOSTFILE,
                     49:            options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE);
                     50:
1.33      markus     51:        return (host_status == HOST_OK);
1.31      markus     52: }
1.11      markus     53:
1.31      markus     54: /*
                     55:  * Tries to authenticate the user using the .rhosts file and the host using
                     56:  * its host key.  Returns true if authentication succeeds.
                     57:  */
                     58: int
1.37      djm        59: auth_rhosts_rsa(Authctxt *authctxt, char *cuser, Key *client_host_key)
1.31      markus     60: {
                     61:        char *chost;
1.37      djm        62:        struct passwd *pw = authctxt->pw;
1.8       markus     63:
1.31      markus     64:        debug("Trying rhosts with RSA host authentication for client user %.100s",
                     65:            cuser);
1.8       markus     66:
1.37      djm        67:        if (!authctxt->valid || client_host_key == NULL ||
1.31      markus     68:            client_host_key->rsa == NULL)
                     69:                return 0;
1.11      markus     70:
1.36      markus     71:        chost = (char *)get_canonical_hostname(options.use_dns);
1.31      markus     72:        debug("Rhosts RSA authentication: canonical host %.900s", chost);
1.24      markus     73:
1.32      provos     74:        if (!PRIVSEP(auth_rhosts_rsa_key_allowed(pw, cuser, chost, client_host_key))) {
1.8       markus     75:                debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
                     76:                packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
                     77:                return 0;
                     78:        }
                     79:        /* A matching host key was found and is known. */
                     80:
                     81:        /* Perform the challenge-response dialog with the client for the host key. */
1.30      markus     82:        if (!auth_rsa_challenge_dialog(client_host_key)) {
1.35      itojun     83:                logit("Client on %.800s failed to respond correctly to host authentication.",
1.31      markus     84:                    chost);
1.8       markus     85:                return 0;
                     86:        }
1.10      markus     87:        /*
                     88:         * We have authenticated the user using .rhosts or /etc/hosts.equiv,
                     89:         * and the host using RSA. We accept the authentication.
                     90:         */
1.8       markus     91:
                     92:        verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
1.38      djm        93:            pw->pw_name, cuser, chost);
1.8       markus     94:        packet_send_debug("Rhosts with RSA host authentication accepted.");
                     95:        return 1;
1.1       provos     96: }