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Annotation of src/usr.bin/ssh/auth-rh-rsa.c, Revision 1.24

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"
1.24    ! markus     16: RCSID("$OpenBSD: auth-rh-rsa.c,v 1.23 2001/04/06 21:00:04 markus Exp $");
1.1       provos     17:
                     18: #include "packet.h"
                     19: #include "xmalloc.h"
                     20: #include "uidswap.h"
1.21      markus     21: #include "log.h"
1.4       markus     22: #include "servconf.h"
1.11      markus     23: #include "key.h"
                     24: #include "hostfile.h"
1.20      markus     25: #include "pathnames.h"
1.21      markus     26: #include "auth.h"
                     27: #include "tildexpand.h"
                     28: #include "canohost.h"
1.11      markus     29:
1.10      markus     30: /*
                     31:  * Tries to authenticate the user using the .rhosts file and the host using
                     32:  * its host key.  Returns true if authentication succeeds.
                     33:  */
1.1       provos     34:
1.13      markus     35: int
1.11      markus     36: auth_rhosts_rsa(struct passwd *pw, const char *client_user, RSA *client_host_key)
1.1       provos     37: {
1.8       markus     38:        extern ServerOptions options;
                     39:        const char *canonical_hostname;
                     40:        HostStatus host_status;
1.24    ! markus     41:        Key *client_key;
1.8       markus     42:
1.17      markus     43:        debug("Trying rhosts with RSA host authentication for client user %.100s", client_user);
1.8       markus     44:
1.17      markus     45:        if (pw == NULL || client_host_key == NULL)
1.11      markus     46:                return 0;
                     47:
1.8       markus     48:        /* Check if we would accept it using rhosts authentication. */
                     49:        if (!auth_rhosts(pw, client_user))
                     50:                return 0;
                     51:
1.22      markus     52:        canonical_hostname = get_canonical_hostname(
                     53:            options.reverse_mapping_check);
1.8       markus     54:
1.11      markus     55:        debug("Rhosts RSA authentication: canonical host %.900s", canonical_hostname);
                     56:
                     57:        /* wrap the RSA key into a 'generic' key */
1.18      markus     58:        client_key = key_new(KEY_RSA1);
1.11      markus     59:        BN_copy(client_key->rsa->e, client_host_key->e);
                     60:        BN_copy(client_key->rsa->n, client_host_key->n);
1.8       markus     61:
1.24    ! markus     62:        host_status = check_key_in_hostfiles(pw, client_key, canonical_hostname,
        !            63:            _PATH_SSH_SYSTEM_HOSTFILE,
        !            64:            options.ignore_user_known_hosts ? _PATH_SSH_USER_HOSTFILE : NULL);
        !            65:
1.11      markus     66:        key_free(client_key);
1.8       markus     67:
                     68:        if (host_status != HOST_OK) {
                     69:                debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
                     70:                packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
                     71:                return 0;
                     72:        }
                     73:        /* A matching host key was found and is known. */
                     74:
                     75:        /* Perform the challenge-response dialog with the client for the host key. */
1.11      markus     76:        if (!auth_rsa_challenge_dialog(client_host_key)) {
1.8       markus     77:                log("Client on %.800s failed to respond correctly to host authentication.",
                     78:                    canonical_hostname);
                     79:                return 0;
                     80:        }
1.10      markus     81:        /*
                     82:         * We have authenticated the user using .rhosts or /etc/hosts.equiv,
                     83:         * and the host using RSA. We accept the authentication.
                     84:         */
1.8       markus     85:
                     86:        verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
1.11      markus     87:           pw->pw_name, client_user, canonical_hostname);
1.8       markus     88:        packet_send_debug("Rhosts with RSA host authentication accepted.");
                     89:        return 1;
1.1       provos     90: }