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Annotation of src/usr.bin/ssh/auth-rh-rsa.c, Revision 1.28

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"
1.28    ! markus     16: RCSID("$OpenBSD: auth-rh-rsa.c,v 1.27 2001/12/27 19:54:53 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 "canohost.h"
1.11      markus     28:
1.10      markus     29: /*
                     30:  * Tries to authenticate the user using the .rhosts file and the host using
                     31:  * its host key.  Returns true if authentication succeeds.
                     32:  */
1.1       provos     33:
1.13      markus     34: int
1.27      markus     35: auth_rhosts_rsa(struct passwd *pw, const char *client_user, Key *client_host_key)
1.1       provos     36: {
1.8       markus     37:        extern ServerOptions options;
                     38:        const char *canonical_hostname;
                     39:        HostStatus host_status;
                     40:
1.17      markus     41:        debug("Trying rhosts with RSA host authentication for client user %.100s", client_user);
1.8       markus     42:
1.27      markus     43:        if (pw == NULL || client_host_key == NULL || client_host_key->rsa == NULL)
1.11      markus     44:                return 0;
                     45:
1.8       markus     46:        /* Check if we would accept it using rhosts authentication. */
                     47:        if (!auth_rhosts(pw, client_user))
                     48:                return 0;
                     49:
1.22      markus     50:        canonical_hostname = get_canonical_hostname(
1.28    ! markus     51:            options.verify_reverse_mapping);
1.8       markus     52:
1.11      markus     53:        debug("Rhosts RSA authentication: canonical host %.900s", canonical_hostname);
                     54:
1.27      markus     55:        host_status = check_key_in_hostfiles(pw, client_host_key,
                     56:            canonical_hostname, _PATH_SSH_SYSTEM_HOSTFILE,
1.25      markus     57:            options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE);
1.24      markus     58:
1.8       markus     59:        if (host_status != HOST_OK) {
                     60:                debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
                     61:                packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
                     62:                return 0;
                     63:        }
                     64:        /* A matching host key was found and is known. */
                     65:
                     66:        /* Perform the challenge-response dialog with the client for the host key. */
1.27      markus     67:        if (!auth_rsa_challenge_dialog(client_host_key->rsa)) {
1.8       markus     68:                log("Client on %.800s failed to respond correctly to host authentication.",
                     69:                    canonical_hostname);
                     70:                return 0;
                     71:        }
1.10      markus     72:        /*
                     73:         * We have authenticated the user using .rhosts or /etc/hosts.equiv,
                     74:         * and the host using RSA. We accept the authentication.
                     75:         */
1.8       markus     76:
                     77:        verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
1.11      markus     78:           pw->pw_name, client_user, canonical_hostname);
1.8       markus     79:        packet_send_debug("Rhosts with RSA host authentication accepted.");
                     80:        return 1;
1.1       provos     81: }