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Annotation of src/usr.bin/ssh/auth-rh-rsa.c, Revision 1.39

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"
                     16:
                     17: #include "packet.h"
                     18: #include "uidswap.h"
1.21      markus     19: #include "log.h"
1.4       markus     20: #include "servconf.h"
1.11      markus     21: #include "key.h"
                     22: #include "hostfile.h"
1.20      markus     23: #include "pathnames.h"
1.21      markus     24: #include "auth.h"
                     25: #include "canohost.h"
1.11      markus     26:
1.32      provos     27: #include "monitor_wrap.h"
                     28:
1.31      markus     29: /* import */
                     30: extern ServerOptions options;
1.1       provos     31:
1.13      markus     32: int
1.31      markus     33: auth_rhosts_rsa_key_allowed(struct passwd *pw, char *cuser, char *chost,
                     34:     Key *client_host_key)
1.1       provos     35: {
1.8       markus     36:        HostStatus host_status;
                     37:
1.31      markus     38:        /* Check if we would accept it using rhosts authentication. */
                     39:        if (!auth_rhosts(pw, cuser))
                     40:                return 0;
1.8       markus     41:
1.31      markus     42:        host_status = check_key_in_hostfiles(pw, client_host_key,
                     43:            chost, _PATH_SSH_SYSTEM_HOSTFILE,
                     44:            options.ignore_user_known_hosts ? NULL : _PATH_SSH_USER_HOSTFILE);
                     45:
1.33      markus     46:        return (host_status == HOST_OK);
1.31      markus     47: }
1.11      markus     48:
1.31      markus     49: /*
                     50:  * Tries to authenticate the user using the .rhosts file and the host using
                     51:  * its host key.  Returns true if authentication succeeds.
                     52:  */
                     53: int
1.37      djm        54: auth_rhosts_rsa(Authctxt *authctxt, char *cuser, Key *client_host_key)
1.31      markus     55: {
                     56:        char *chost;
1.37      djm        57:        struct passwd *pw = authctxt->pw;
1.8       markus     58:
1.31      markus     59:        debug("Trying rhosts with RSA host authentication for client user %.100s",
                     60:            cuser);
1.8       markus     61:
1.37      djm        62:        if (!authctxt->valid || client_host_key == NULL ||
1.31      markus     63:            client_host_key->rsa == NULL)
                     64:                return 0;
1.11      markus     65:
1.36      markus     66:        chost = (char *)get_canonical_hostname(options.use_dns);
1.31      markus     67:        debug("Rhosts RSA authentication: canonical host %.900s", chost);
1.24      markus     68:
1.32      provos     69:        if (!PRIVSEP(auth_rhosts_rsa_key_allowed(pw, cuser, chost, client_host_key))) {
1.8       markus     70:                debug("Rhosts with RSA host authentication denied: unknown or invalid host key");
                     71:                packet_send_debug("Your host key cannot be verified: unknown or invalid host key.");
                     72:                return 0;
                     73:        }
                     74:        /* A matching host key was found and is known. */
                     75:
                     76:        /* Perform the challenge-response dialog with the client for the host key. */
1.30      markus     77:        if (!auth_rsa_challenge_dialog(client_host_key)) {
1.35      itojun     78:                logit("Client on %.800s failed to respond correctly to host authentication.",
1.31      markus     79:                    chost);
1.8       markus     80:                return 0;
                     81:        }
1.10      markus     82:        /*
                     83:         * We have authenticated the user using .rhosts or /etc/hosts.equiv,
                     84:         * and the host using RSA. We accept the authentication.
                     85:         */
1.8       markus     86:
                     87:        verbose("Rhosts with RSA host authentication accepted for %.100s, %.100s on %.700s.",
1.38      djm        88:            pw->pw_name, cuser, chost);
1.8       markus     89:        packet_send_debug("Rhosts with RSA host authentication accepted.");
                     90:        return 1;
1.1       provos     91: }