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Annotation of src/usr.bin/ssh/auth-rh-rsa.c, Revision 1.32

1.1       provos      1: /*
1.9       deraadt     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:  *
1.15      deraadt     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".
1.9       deraadt    13:  */
1.1       provos     14:
                     15: #include "includes.h"
1.30      markus     16: RCSID("$OpenBSD: auth-rh-rsa.c,v 1.29 2002/03/04 12:43:06 markus Exp $");
1.1       provos     17:
                     18: #include "packet.h"
                     19: #include "uidswap.h"
1.21      markus     20: #include "log.h"
1.4       markus     21: #include "servconf.h"
1.11      markus     22: #include "key.h"
                     23: #include "hostfile.h"
1.20      markus     24: #include "pathnames.h"
1.21      markus     25: #include "auth.h"
                     26: #include "canohost.h"
1.11      markus     27:
1.32    ! provos     28: #include "monitor_wrap.h"
        !            29:
1.31      markus     30: /* import */
                     31: extern ServerOptions options;
                     32:
1.10      markus     33: /*
                     34:  * Tries to authenticate the user using the .rhosts file and the host using
                     35:  * its host key.  Returns true if authentication succeeds.
                     36:  */
1.1       provos     37:
1.13      markus     38: int
1.31      markus     39: auth_rhosts_rsa_key_allowed(struct passwd *pw, char *cuser, char *chost,
                     40:     Key *client_host_key)
1.1       provos     41: {
1.8       markus     42:        HostStatus host_status;
                     43:
1.31      markus     44:        /* Check if we would accept it using rhosts authentication. */
                     45:        if (!auth_rhosts(pw, cuser))
                     46:                return 0;
1.8       markus     47:
1.31      markus     48:        host_status = check_key_in_hostfiles(pw, client_host_key,
                     49:            chost, _PATH_SSH_SYSTEM_HOSTFILE,
                     50:            options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE);
                     51:
                     52:         return (host_status == HOST_OK);
                     53: }
1.11      markus     54:
1.31      markus     55: /*
                     56:  * Tries to authenticate the user using the .rhosts file and the host using
                     57:  * its host key.  Returns true if authentication succeeds.
                     58:  */
                     59: int
                     60: auth_rhosts_rsa(struct passwd *pw, char *cuser, Key *client_host_key)
                     61: {
                     62:        char *chost;
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:
1.31      markus     67:        if (pw == NULL || client_host_key == NULL ||
                     68:            client_host_key->rsa == NULL)
                     69:                return 0;
1.11      markus     70:
1.31      markus     71:        chost = (char *)get_canonical_hostname(options.verify_reverse_mapping);
                     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)) {
1.8       markus     83:                log("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.",
1.31      markus     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: }