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Annotation of src/usr.bin/ssh/auth-rh-rsa.c, Revision 1.42

1.42    ! deraadt     1: /* $OpenBSD: auth-rh-rsa.c,v 1.41 2006/07/06 16:03:53 stevesk 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:
1.41      stevesk    16: #include <sys/types.h>
                     17:
                     18: #include <pwd.h>
1.42    ! deraadt    19: #include <stdarg.h>
1.1       provos     20:
                     21: #include "packet.h"
                     22: #include "uidswap.h"
1.21      markus     23: #include "log.h"
1.42    ! deraadt    24: #include "buffer.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"
1.42    ! deraadt    31: #ifdef GSSAPI
        !            32: #include "ssh-gss.h"
        !            33: #endif
1.32      provos     34: #include "monitor_wrap.h"
                     35:
1.31      markus     36: /* import */
                     37: extern ServerOptions options;
1.1       provos     38:
1.13      markus     39: int
1.31      markus     40: auth_rhosts_rsa_key_allowed(struct passwd *pw, char *cuser, char *chost,
                     41:     Key *client_host_key)
1.1       provos     42: {
1.8       markus     43:        HostStatus host_status;
                     44:
1.31      markus     45:        /* Check if we would accept it using rhosts authentication. */
                     46:        if (!auth_rhosts(pw, cuser))
                     47:                return 0;
1.8       markus     48:
1.31      markus     49:        host_status = check_key_in_hostfiles(pw, client_host_key,
                     50:            chost, _PATH_SSH_SYSTEM_HOSTFILE,
                     51:            options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE);
                     52:
1.33      markus     53:        return (host_status == HOST_OK);
1.31      markus     54: }
1.11      markus     55:
1.31      markus     56: /*
                     57:  * Tries to authenticate the user using the .rhosts file and the host using
                     58:  * its host key.  Returns true if authentication succeeds.
                     59:  */
                     60: int
1.37      djm        61: auth_rhosts_rsa(Authctxt *authctxt, char *cuser, Key *client_host_key)
1.31      markus     62: {
                     63:        char *chost;
1.37      djm        64:        struct passwd *pw = authctxt->pw;
1.8       markus     65:
1.31      markus     66:        debug("Trying rhosts with RSA host authentication for client user %.100s",
                     67:            cuser);
1.8       markus     68:
1.37      djm        69:        if (!authctxt->valid || client_host_key == NULL ||
1.31      markus     70:            client_host_key->rsa == NULL)
                     71:                return 0;
1.11      markus     72:
1.36      markus     73:        chost = (char *)get_canonical_hostname(options.use_dns);
1.31      markus     74:        debug("Rhosts RSA authentication: canonical host %.900s", chost);
1.24      markus     75:
1.32      provos     76:        if (!PRIVSEP(auth_rhosts_rsa_key_allowed(pw, cuser, chost, client_host_key))) {
1.8       markus     77:                debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
                     78:                packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
                     79:                return 0;
                     80:        }
                     81:        /* A matching host key was found and is known. */
                     82:
                     83:        /* Perform the challenge-response dialog with the client for the host key. */
1.30      markus     84:        if (!auth_rsa_challenge_dialog(client_host_key)) {
1.35      itojun     85:                logit("Client on %.800s failed to respond correctly to host authentication.",
1.31      markus     86:                    chost);
1.8       markus     87:                return 0;
                     88:        }
1.10      markus     89:        /*
                     90:         * We have authenticated the user using .rhosts or /etc/hosts.equiv,
                     91:         * and the host using RSA. We accept the authentication.
                     92:         */
1.8       markus     93:
                     94:        verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
1.38      djm        95:            pw->pw_name, cuser, chost);
1.8       markus     96:        packet_send_debug("Rhosts with RSA host authentication accepted.");
                     97:        return 1;
1.1       provos     98: }