758f3a64bd
1) Don't spit out an error message if Kerberos is installed but not yet set up. 2) Don't attempt to verify the ticket you got back, as workstations are not intended to have srvtab files of their own. Both behaviors can be re-enabled with KLOGIN_PARANOID.
202 lines
6.1 KiB
C
202 lines
6.1 KiB
C
/*-
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* Copyright (c) 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)klogin.c 8.3 (Berkeley) 4/2/94";
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#endif /* not lint */
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#ifdef KERBEROS
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#include <sys/param.h>
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#include <sys/syslog.h>
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#include <kerberosIV/des.h>
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#include <kerberosIV/krb.h>
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#include <err.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define INITIAL_TICKET "krbtgt"
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#define VERIFY_SERVICE "rcmd"
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extern int notickets;
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extern char *krbtkfile_env;
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/*
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* Attempt to log the user in using Kerberos authentication
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*
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* return 0 on success (will be logged in)
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* 1 if Kerberos failed (try local password in login)
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*/
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int
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klogin(pw, instance, localhost, password)
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struct passwd *pw;
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char *instance, *localhost, *password;
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{
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int kerror;
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AUTH_DAT authdata;
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KTEXT_ST ticket;
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struct hostent *hp;
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unsigned long faddr;
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char realm[REALM_SZ], savehost[MAXHOSTNAMELEN];
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char tkt_location[MAXPATHLEN];
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char *krb_get_phost();
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extern int noticketsdontcomplain;
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#ifdef KLOGIN_PARANOID
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noticketsdontcomplain = 0; /* enable warning message */
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#endif
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/*
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* Root logins don't use Kerberos.
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* If we have a realm, try getting a ticket-granting ticket
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* and using it to authenticate. Otherwise, return
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* failure so that we can try the normal passwd file
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* for a password. If that's ok, log the user in
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* without issuing any tickets.
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*/
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if (strcmp(pw->pw_name, "root") == 0 ||
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krb_get_lrealm(realm, 0) != KSUCCESS)
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return (1);
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noticketsdontcomplain = 0; /* enable warning message */
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/*
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* get TGT for local realm
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* tickets are stored in a file named TKT_ROOT plus uid
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* except for user.root tickets.
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*/
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if (strcmp(instance, "root") != 0)
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(void)sprintf(tkt_location, "%s%d", TKT_ROOT, pw->pw_uid);
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else {
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(void)sprintf(tkt_location, "%s_root_%d", TKT_ROOT, pw->pw_uid);
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krbtkfile_env = tkt_location;
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}
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(void)krb_set_tkt_string(tkt_location);
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/*
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* Set real as well as effective ID to 0 for the moment,
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* to make the kerberos library do the right thing.
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*/
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if (setuid(0) < 0) {
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warnx("setuid");
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return (1);
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}
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kerror = krb_get_pw_in_tkt(pw->pw_name, instance,
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realm, INITIAL_TICKET, realm, DEFAULT_TKT_LIFE, password);
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/*
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* If we got a TGT, get a local "rcmd" ticket and check it so as to
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* ensure that we are not talking to a bogus Kerberos server.
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*
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* There are 2 cases where we still allow a login:
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* 1: the VERIFY_SERVICE doesn't exist in the KDC
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* 2: local host has no srvtab, as (hopefully) indicated by a
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* return value of RD_AP_UNDEC from krb_rd_req().
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*/
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if (kerror != INTK_OK) {
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if (kerror != INTK_BADPW && kerror != KDC_PR_UNKNOWN) {
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syslog(LOG_ERR, "Kerberos intkt error: %s",
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krb_err_txt[kerror]);
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dest_tkt();
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}
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return (1);
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}
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if (chown(TKT_FILE, pw->pw_uid, pw->pw_gid) < 0)
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syslog(LOG_ERR, "chown tkfile (%s): %m", TKT_FILE);
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(void)strncpy(savehost, krb_get_phost(localhost), sizeof(savehost));
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savehost[sizeof(savehost)-1] = NULL;
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#ifdef KLOGIN_PARANOID
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/*
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* if the "VERIFY_SERVICE" doesn't exist in the KDC for this host,
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* still allow login with tickets, but log the error condition.
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*/
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kerror = krb_mk_req(&ticket, VERIFY_SERVICE, savehost, realm, 33);
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if (kerror == KDC_PR_UNKNOWN) {
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syslog(LOG_NOTICE,
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"warning: TGT not verified (%s); %s.%s not registered, or srvtab is wrong?",
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krb_err_txt[kerror], VERIFY_SERVICE, savehost);
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notickets = 0;
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return (0);
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}
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if (kerror != KSUCCESS) {
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warnx("unable to use TGT: (%s)", krb_err_txt[kerror]);
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syslog(LOG_NOTICE, "unable to use TGT: (%s)",
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krb_err_txt[kerror]);
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dest_tkt();
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return (1);
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}
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if (!(hp = gethostbyname(localhost))) {
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syslog(LOG_ERR, "couldn't get local host address");
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dest_tkt();
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return (1);
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}
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memmove((void *)&faddr, (void *)hp->h_addr, sizeof(faddr));
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kerror = krb_rd_req(&ticket, VERIFY_SERVICE, savehost, faddr,
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&authdata, "");
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if (kerror == KSUCCESS) {
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notickets = 0;
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return (0);
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}
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/* undecipherable: probably didn't have a srvtab on the local host */
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if (kerror = RD_AP_UNDEC) {
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syslog(LOG_NOTICE, "krb_rd_req: (%s)\n", krb_err_txt[kerror]);
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dest_tkt();
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return (1);
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}
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/* failed for some other reason */
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warnx("unable to verify %s ticket: (%s)", VERIFY_SERVICE,
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krb_err_txt[kerror]);
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syslog(LOG_NOTICE, "couldn't verify %s ticket: %s", VERIFY_SERVICE,
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krb_err_txt[kerror]);
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dest_tkt();
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return (1);
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#else
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return (0);
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#endif
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}
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#endif
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