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Annotation of src/usr.bin/ssh/auth-rh-rsa.c, Revision 1.29

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"
1.29    ! markus     16: RCSID("$OpenBSD: auth-rh-rsa.c,v 1.28 2002/01/29 14:32:03 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:
1.10      markus     28: /*
                     29:  * Tries to authenticate the user using the .rhosts file and the host using
                     30:  * its host key.  Returns true if authentication succeeds.
                     31:  */
1.1       provos     32:
1.13      markus     33: int
1.27      markus     34: auth_rhosts_rsa(struct passwd *pw, const char *client_user, Key *client_host_key)
1.1       provos     35: {
1.8       markus     36:        extern ServerOptions options;
                     37:        const char *canonical_hostname;
                     38:        HostStatus host_status;
                     39:
1.17      markus     40:        debug("Trying rhosts with RSA host authentication for client user %.100s", client_user);
1.8       markus     41:
1.27      markus     42:        if (pw == NULL || client_host_key == NULL || client_host_key->rsa == NULL)
1.11      markus     43:                return 0;
                     44:
1.8       markus     45:        /* Check if we would accept it using rhosts authentication. */
                     46:        if (!auth_rhosts(pw, client_user))
                     47:                return 0;
                     48:
1.22      markus     49:        canonical_hostname = get_canonical_hostname(
1.28      markus     50:            options.verify_reverse_mapping);
1.8       markus     51:
1.11      markus     52:        debug("Rhosts RSA authentication: canonical host %.900s", canonical_hostname);
                     53:
1.27      markus     54:        host_status = check_key_in_hostfiles(pw, client_host_key,
                     55:            canonical_hostname, _PATH_SSH_SYSTEM_HOSTFILE,
1.25      markus     56:            options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE);
1.24      markus     57:
1.8       markus     58:        if (host_status != HOST_OK) {
                     59:                debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
                     60:                packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
                     61:                return 0;
                     62:        }
                     63:        /* A matching host key was found and is known. */
                     64:
                     65:        /* Perform the challenge-response dialog with the client for the host key. */
1.27      markus     66:        if (!auth_rsa_challenge_dialog(client_host_key->rsa)) {
1.8       markus     67:                log("Client on %.800s failed to respond correctly to host authentication.",
                     68:                    canonical_hostname);
                     69:                return 0;
                     70:        }
1.10      markus     71:        /*
                     72:         * We have authenticated the user using .rhosts or /etc/hosts.equiv,
                     73:         * and the host using RSA. We accept the authentication.
                     74:         */
1.8       markus     75:
                     76:        verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
1.11      markus     77:           pw->pw_name, client_user, canonical_hostname);
1.8       markus     78:        packet_send_debug("Rhosts with RSA host authentication accepted.");
                     79:        return 1;
1.1       provos     80: }