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Annotation of embedaddon/sudo/plugins/sudoers/auth/kerb4.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (c) 1999-2005, 2007, 2010-2011
                      3:  *     Todd C. Miller <Todd.Miller@courtesan.com>
                      4:  *
                      5:  * Permission to use, copy, modify, and distribute this software for any
                      6:  * purpose with or without fee is hereby granted, provided that the above
                      7:  * copyright notice and this permission notice appear in all copies.
                      8:  *
                      9:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     10:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     11:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     12:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     13:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     14:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     15:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     16:  *
                     17:  * Sponsored in part by the Defense Advanced Research Projects
                     18:  * Agency (DARPA) and Air Force Research Laboratory, Air Force
                     19:  * Materiel Command, USAF, under agreement number F39502-99-1-0512.
                     20:  */
                     21: 
                     22: #include <config.h>
                     23: 
                     24: #include <sys/types.h>
                     25: #include <sys/param.h>
                     26: #include <stdio.h>
                     27: #ifdef STDC_HEADERS
                     28: # include <stdlib.h>
                     29: # include <stddef.h>
                     30: #else
                     31: # ifdef HAVE_STDLIB_H
                     32: #  include <stdlib.h>
                     33: # endif
                     34: #endif /* STDC_HEADERS */
                     35: #ifdef HAVE_STRING_H
                     36: # include <string.h>
                     37: #endif /* HAVE_STRING_H */
                     38: #ifdef HAVE_STRINGS_H
                     39: # include <strings.h>
                     40: #endif /* HAVE_STRING_H */
                     41: #ifdef HAVE_UNISTD_H
                     42: # include <unistd.h>
                     43: #endif /* HAVE_UNISTD_H */
                     44: #include <pwd.h>
                     45: #include <krb.h>
                     46: 
                     47: #include "sudoers.h"
                     48: #include "sudo_auth.h"
                     49: 
                     50: int
                     51: kerb4_init(struct passwd *pw, sudo_auth *auth)
                     52: {
                     53:     static char realm[REALM_SZ];
                     54: 
                     55:     /* Don't try to verify root */
                     56:     if (pw->pw_uid == 0)
                     57:        return AUTH_FAILURE;
                     58: 
                     59:     /* Get the local realm, or retrun failure (no krb.conf) */
                     60:     if (krb_get_lrealm(realm, 1) != KSUCCESS)
                     61:        return AUTH_FAILURE;
                     62: 
                     63:     /* Stash a pointer to the realm (used in kerb4_verify) */
                     64:     auth->data = (void *) realm;
                     65: 
                     66:     return AUTH_SUCCESS;
                     67: }
                     68: 
                     69: int
                     70: kerb4_verify(struct passwd *pw, char *pass, sudo_auth *auth)
                     71: {
                     72:     char tkfile[sizeof(_PATH_SUDO_TIMEDIR) + 4 + MAX_UID_T_LEN];
                     73:     char *realm = (char *) auth->data;
                     74:     int error;
                     75: 
                     76:     /*
                     77:      * Set the ticket file to be in sudo sudo timedir so we don't
                     78:      * wipe out other (real) kerberos tickets.
                     79:      */
                     80:     (void) snprintf(tkfile, sizeof(tkfile), "%s/tkt%u",
                     81:        _PATH_SUDO_TIMEDIR, (unsigned int) pw->pw_uid);
                     82:     (void) krb_set_tkt_string(tkfile);
                     83: 
                     84:     /* Convert the password to a ticket given. */
                     85:     error = krb_get_pw_in_tkt(pw->pw_name, "", realm, "krbtgt", realm,
                     86:        DEFAULT_TKT_LIFE, pass);
                     87: 
                     88:     switch (error) {
                     89:        case INTK_OK:
                     90:            dest_tkt();                 /* we are done with the temp ticket */
                     91:            return AUTH_SUCCESS;
                     92:            break;
                     93:        case INTK_BADPW:
                     94:        case KDC_PR_UNKNOWN:
                     95:            break;
                     96:        default:
                     97:            (void) fprintf(stderr, "Warning: Kerberos error: %s\n",
                     98:                krb_err_txt[error]);
                     99:     }
                    100: 
                    101:     return AUTH_FAILURE;
                    102: }