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Annotation of src/usr.bin/ssh/auth-rh-rsa.c, Revision 1.45

1.45    ! djm         1: /* $OpenBSD: auth-rh-rsa.c,v 1.44 2014/07/15 15:54:14 millert 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"
1.44      millert    25: #include "misc.h"
1.4       markus     26: #include "servconf.h"
1.11      markus     27: #include "key.h"
                     28: #include "hostfile.h"
1.20      markus     29: #include "pathnames.h"
1.21      markus     30: #include "auth.h"
                     31: #include "canohost.h"
1.42      deraadt    32: #ifdef GSSAPI
                     33: #include "ssh-gss.h"
                     34: #endif
1.32      provos     35: #include "monitor_wrap.h"
                     36:
1.31      markus     37: /* import */
                     38: extern ServerOptions options;
1.1       provos     39:
1.13      markus     40: int
1.45    ! djm        41: auth_rhosts_rsa_key_allowed(struct passwd *pw, const char *cuser,
        !            42:     const char *chost, Key *client_host_key)
1.1       provos     43: {
1.8       markus     44:        HostStatus host_status;
1.43      djm        45:
                     46:        if (auth_key_is_revoked(client_host_key))
                     47:                return 0;
1.8       markus     48:
1.31      markus     49:        /* Check if we would accept it using rhosts authentication. */
                     50:        if (!auth_rhosts(pw, cuser))
                     51:                return 0;
1.8       markus     52:
1.31      markus     53:        host_status = check_key_in_hostfiles(pw, client_host_key,
                     54:            chost, _PATH_SSH_SYSTEM_HOSTFILE,
                     55:            options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE);
                     56:
1.33      markus     57:        return (host_status == HOST_OK);
1.31      markus     58: }
1.11      markus     59:
1.31      markus     60: /*
                     61:  * Tries to authenticate the user using the .rhosts file and the host using
                     62:  * its host key.  Returns true if authentication succeeds.
                     63:  */
                     64: int
1.37      djm        65: auth_rhosts_rsa(Authctxt *authctxt, char *cuser, Key *client_host_key)
1.31      markus     66: {
1.45    ! djm        67:        struct ssh *ssh = active_state; /* XXX */
        !            68:        const char *chost;
1.37      djm        69:        struct passwd *pw = authctxt->pw;
1.8       markus     70:
1.31      markus     71:        debug("Trying rhosts with RSA host authentication for client user %.100s",
                     72:            cuser);
1.8       markus     73:
1.37      djm        74:        if (!authctxt->valid || client_host_key == NULL ||
1.31      markus     75:            client_host_key->rsa == NULL)
                     76:                return 0;
1.11      markus     77:
1.45    ! djm        78:        chost = auth_get_canonical_hostname(ssh, options.use_dns);
1.31      markus     79:        debug("Rhosts RSA authentication: canonical host %.900s", chost);
1.24      markus     80:
1.32      provos     81:        if (!PRIVSEP(auth_rhosts_rsa_key_allowed(pw, cuser, chost, client_host_key))) {
1.8       markus     82:                debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
                     83:                packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
                     84:                return 0;
                     85:        }
                     86:        /* A matching host key was found and is known. */
                     87:
                     88:        /* Perform the challenge-response dialog with the client for the host key. */
1.30      markus     89:        if (!auth_rsa_challenge_dialog(client_host_key)) {
1.35      itojun     90:                logit("Client on %.800s failed to respond correctly to host authentication.",
1.31      markus     91:                    chost);
1.8       markus     92:                return 0;
                     93:        }
1.10      markus     94:        /*
                     95:         * We have authenticated the user using .rhosts or /etc/hosts.equiv,
                     96:         * and the host using RSA. We accept the authentication.
                     97:         */
1.8       markus     98:
                     99:        verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
1.38      djm       100:            pw->pw_name, cuser, chost);
1.8       markus    101:        packet_send_debug("Rhosts with RSA host authentication accepted.");
                    102:        return 1;
1.1       provos    103: }