remove extraneous debug code

[unix-history] / usr / src / usr.bin / login / klogin.c

/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char sccsid[] = "@(#)klogin.c    5.3 (Berkeley) %G%";
#endif /* not lint */

#ifdef KERBEROS
#include <sys/param.h>
#include <sys/syslog.h>
#include <kerberosIV/des.h>
#include <kerberosIV/krb.h>
#include <pwd.h>
#include <netdb.h>

#define PRINCIPAL_NAME  pw->pw_name
#define PRINCIPAL_INST  ""
#define INITIAL_TICKET  "krbtgt"
#define VERIFY_SERVICE  "rcmd"

extern int notickets;

/*
* Attempt to log the user in using Kerberos authentication
*
* return 0 on success (will be logged in)
*        1 if Kerberos failed (try local password in login)
*/

klogin(pw, localhost, password)
       struct passwd *pw;
       char *localhost, *password;
{
       int kerror;
       AUTH_DAT authdata;
       KTEXT_ST ticket;
       struct hostent *hp;
       unsigned long faddr;
       char realm[REALM_SZ], savehost[MAXHOSTNAMELEN];
       char tkt_location[MAXPATHLEN];

       /*
        * If we aren't Kerberos-authenticated, try the normal pw file
        * for a password.  If that's ok, log the user in without issueing
        * any tickets.
        */
       if (krb_get_lrealm(realm, 1) != KSUCCESS)
               return(1);

       /*
        * get TGT for local realm
        * tickets are stored in a file determined by calling tkt_string()
        */

       (void)sprintf(tkt_location, "%s%d", TKT_ROOT, pw->pw_uid);
       (void)krb_set_tkt_string(tkt_location);
       (void)dest_tkt();

       kerror = krb_get_pw_in_tkt(PRINCIPAL_NAME, PRINCIPAL_INST,
                   realm, INITIAL_TICKET, realm, DEFAULT_TKT_LIFE, password);
       /*
        * If we got a TGT, get a local "rcmd" ticket and check it so as to
        * ensure that we are not talking to a bogus Kerberos server.
        *
        * There are 2 cases where we still allow a login:
        *      1: the VERIFY_SERVICE doesn't exist in the KDC
        *      2: local host has no srvtab, as (hopefully) indicated by a
        *         return value of RD_AP_UNDEC from krb_rd_req().
        */
       if (kerror != INTK_OK) {
               dest_tkt();
               if (kerror != INTK_BADPW && kerror != KDC_PR_UNKNOWN)
                       syslog(LOG_ERR, "Kerberos intkt error: %s",
                           krb_err_txt[kerror]);
               return(1);
       }

       if (chown(TKT_FILE, pw->pw_uid, pw->pw_gid) < 0)
               syslog(LOG_ERR, "chown tkfile (%s): %m", TKT_FILE);

       (void)strncpy(savehost, krb_get_phost(localhost), sizeof(savehost));
       savehost[sizeof(savehost)-1] = NULL;

       /*
        * if the "VERIFY_SERVICE" doesn't exist in the KDC for this host,
        * still allow login with tickets, but log the error condition.
        */

       kerror = krb_mk_req(&ticket, VERIFY_SERVICE, savehost, realm, 33);
       if (kerror == KDC_PR_UNKNOWN) {
               syslog(LOG_NOTICE, "warning: TGT not verified (%s)",
                   krb_err_txt[kerror]);
               notickets = 0;
               return(0);
       }

       if (kerror != KSUCCESS) {
               (void)printf("unable to use TGT: (%s)\n", krb_err_txt[kerror]);
               syslog(LOG_NOTICE, "unable to use TGT: (%s)",
                   krb_err_txt[kerror]);
               dest_tkt();
               return(1);
       }

       if (!(hp = gethostbyname(localhost))) {
               syslog(LOG_ERR, "couldn't get local host address");
               dest_tkt();
               return(1);
       }

       bcopy((void *)hp->h_addr, (void *)&faddr, sizeof(faddr));

       kerror = krb_rd_req(&ticket, VERIFY_SERVICE, savehost, faddr,
           &authdata, "");

       if (kerror == KSUCCESS) {
               notickets = 0;
               return(0);
       }

       /* undecipherable: probably didn't have a srvtab on the local host */
       if (kerror = RD_AP_UNDEC) {
               syslog(LOG_NOTICE, "krb_rd_req: (%s)\n", krb_err_txt[kerror]);
               dest_tkt();
               return(1);
       }
       /* failed for some other reason */
       (void)printf("unable to verify %s ticket: (%s)\n", VERIFY_SERVICE,
           krb_err_txt[kerror]);
       syslog(LOG_NOTICE, "couldn't verify %s ticket: %s", VERIFY_SERVICE,
           krb_err_txt[kerror]);
       dest_tkt();
       return(1);
}
#endif