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

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