ATTENTION: INSTALL "/etc/pam.conf" FROM "src/etc"!!!
Change login to use PAM for authentication. I kept the built-in passwd/NIS authentication support, to handle cases where the system is missing its "/etc/pam.conf" file. S/Key and KerberosIV authentication methods are removed from the login program, but still available in PAM modules.
This commit is contained in:
jdp
parent
f21429fd93
commit
d2ea95af9d
@ -1,27 +1,15 @@
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# From: @(#)Makefile 8.1 (Berkeley) 7/19/93
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# $Id: Makefile,v 1.22 1998/11/11 02:16:01 jdp Exp $
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# $Id: Makefile,v 1.23 1998/11/11 05:47:45 jdp Exp $
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PROG= login
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MAN1= login.1
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MAN5= login.access.5
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SRCS= login.c login_access.c login_fbtab.c
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CFLAGS+=-Wall -DSKEY -DLOGIN_ACCESS -DLOGALL
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CFLAGS+=-Wall -DLOGIN_ACCESS -DLOGALL
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.if defined(KLOGIN_PARANOID)
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CFLAGS+=-DKLOGIN_PARANOID
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.endif
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DPADD= ${LIBUTIL} ${LIBSKEY} ${LIBMD} ${LIBCRYPT}
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LDADD= -lutil -lskey -lmd -lcrypt
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.if exists(${DESTDIR}${LIBDIR}/libkrb.a) && defined(MAKE_KERBEROS4)
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CFLAGS+=-DKERBEROS
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SRCS+= klogin.c
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DPADD+= ${LIBKRB} ${LIBDES}
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LDADD+= -lkrb -ldes
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DISTRIBUTION= krb
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.endif
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DPADD= ${LIBUTIL} ${LIBCRYPT} ${LIBPAM}
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LDADD= -lutil -lcrypt -lpam
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BINMODE=4555
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INSTALLFLAGS=-fschg
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@ -1,204 +0,0 @@
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/*-
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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 const 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 <des.h>
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#include <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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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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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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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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notickets = 0;
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return (0);
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#endif
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}
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#endif
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@ -42,7 +42,7 @@ static char copyright[] =
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static char sccsid[] = "@(#)login.c 8.4 (Berkeley) 4/2/94";
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#endif
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static const char rcsid[] =
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"$Id: login.c,v 1.41 1998/11/11 02:16:01 jdp Exp $";
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"$Id: login.c,v 1.42 1998/11/11 05:47:45 jdp Exp $";
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#endif /* not lint */
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/*
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@ -77,9 +77,8 @@ static const char rcsid[] =
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#include <unistd.h>
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#include <utmp.h>
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#ifdef SKEY
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#include <skey.h>
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#endif /* SKEY */
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#include <security/pam_appl.h>
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#include <security/pam_misc.h>
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#include "pathnames.h"
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@ -96,12 +95,10 @@ char *stypeof __P((char *));
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void timedout __P((int));
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int login_access __P((char *, char *));
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void login_fbtab __P((char *, uid_t, gid_t));
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#ifdef KERBEROS
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int klogin __P((struct passwd *, char *, char *, char *));
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#endif
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static int auth_pam __P((void));
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static int auth_traditional __P((void));
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extern void login __P((struct utmp *));
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extern void trimdomain __P((char *, int));
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static void usage __P((void));
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#define TTYGRPNAME "tty" /* name of group to own ttys */
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@ -114,14 +111,6 @@ static void usage __P((void));
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*/
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u_int timeout = 300;
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#ifdef KERBEROS
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int notickets = 1;
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int noticketsdontcomplain = 1;
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char *instance;
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char *krbtkfile_env;
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int authok;
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#endif
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struct passwd *pwd;
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int failures;
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char *term, *envinit[1], *hostname, *username, *tty;
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@ -142,18 +131,11 @@ main(argc, argv)
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int changepass;
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time_t warntime;
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uid_t uid, euid;
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char *domain, *p, *salt, *ttyn;
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const char *ep;
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char *domain, *p, *ttyn;
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char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10];
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char localhost[MAXHOSTNAMELEN];
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char *shell = NULL;
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login_cap_t *lc = NULL;
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#ifdef SKEY
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int permit_passwd = 0;
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#endif /* SKEY */
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#ifdef KERBEROS
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char *k;
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#endif
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(void)signal(SIGALRM, timedout);
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(void)alarm(timeout);
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@ -256,14 +238,6 @@ main(argc, argv)
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}
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rootlogin = 0;
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rootok = rootterm(tty); /* Default (auth may change) */
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#ifdef KERBEROS
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if ((instance = strchr(username, '.')) != NULL) {
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if (strncmp(instance, ".root", 5) == 0)
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rootlogin = 1;
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*instance++ = '\0';
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} else
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instance = "";
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#endif /* KERBEROS */
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if (strlen(username) > UT_NAMESIZE)
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username[UT_NAMESIZE] = '\0';
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@ -281,20 +255,7 @@ main(argc, argv)
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(void)strncpy(tbuf, username, sizeof tbuf-1);
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tbuf[sizeof tbuf-1] = '\0';
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if ((pwd = getpwnam(username)) != NULL)
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salt = pwd->pw_passwd;
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else
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salt = "xx";
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/*
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* Establish the class now, before we might goto
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* within the next block. pwd can be NULL since it
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* falls back to the "default" class if it is.
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*/
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if (pwd != NULL)
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(void)seteuid(rootlogin ? 0 : pwd->pw_uid);
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lc = login_getpwclass(pwd);
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seteuid(euid);
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pwd = getpwnam(username);
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/*
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* if we have a valid account name, and it doesn't have a
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@ -302,7 +263,6 @@ main(argc, argv)
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* is root or the caller isn't changing their uid, don't
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* authenticate.
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*/
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rval = 1;
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if (pwd != NULL) {
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if (pwd->pw_uid == 0)
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rootlogin = 1;
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@ -324,63 +284,31 @@ main(argc, argv)
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(void)setpriority(PRIO_PROCESS, 0, -4);
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#ifdef SKEY
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permit_passwd = skeyaccess(username, tty,
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hostname ? full_hostname : NULL,
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NULL);
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p = skey_getpass("Password:", pwd, permit_passwd);
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ep = skey_crypt(p, salt, pwd, permit_passwd);
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#else /* !SKEY */
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p = getpass("Password:");
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ep = crypt(p, salt);
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#endif/* SKEY */
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if (pwd) {
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if (!p[0] && pwd->pw_passwd[0])
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ep = ":";
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#ifdef KERBEROS
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#ifdef SKEY
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/*
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* Do not allow user to type in kerberos password
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* over the net (actually, this is ok for encrypted
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* links, but we have no way of determining if the
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* link is encrypted.
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*/
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if (!permit_passwd) {
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rval = 1; /* failed */
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} else
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#endif /* SKEY */
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rval = 1;
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k = auth_getval("auth_list");
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if (k && strstr(k, "kerberos"))
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rval = klogin(pwd, instance, localhost, p);
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if (rval != 0 && rootlogin && pwd->pw_uid != 0)
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rootlogin = 0;
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if (rval == 0)
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authok = 1; /* kerberos authenticated ok */
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else if (rval == 1) /* fallback to unix passwd */
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rval = strcmp(ep, pwd->pw_passwd);
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#else /* !KERBEROS */
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rval = strcmp(ep, pwd->pw_passwd);
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#endif /* KERBEROS */
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}
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/* clear entered password */
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memset(p, 0, strlen(p));
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/*
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* Try to authenticate using PAM. If a PAM system error
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* occurs, perhaps because of a botched configuration,
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* then fall back to using traditional Unix authentication.
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*/
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if ((rval = auth_pam()) == -1)
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rval = auth_traditional();
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(void)setpriority(PRIO_PROCESS, 0, 0);
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/*
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* PAM authentication may have changed "pwd" to the
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* entry for the template user. Check again to see if
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* this is a root login after all.
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*/
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if (pwd != NULL && pwd->pw_uid == 0)
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rootlogin = 1;
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ttycheck:
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/*
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* If trying to log in as root without Kerberos,
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* but with insecure terminal, refuse the login attempt.
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*/
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if (pwd && !rval) {
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#if defined(KERBEROS)
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if (authok == 0 && rootlogin && !rootok)
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#else
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if (rootlogin && !rootok)
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#endif
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refused(NULL, "NOROOT", 0);
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else /* valid password & authenticated */
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break;
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@ -407,6 +335,13 @@ main(argc, argv)
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endpwent();
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/*
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* Establish the login class.
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*/
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(void)seteuid(rootlogin ? 0 : pwd->pw_uid);
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lc = login_getpwclass(pwd);
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seteuid(euid);
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/* if user not super-user, check for disabled logins */
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if (!rootlogin)
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auth_checknologin(lc);
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@ -530,11 +465,6 @@ main(argc, argv)
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if (hostname==NULL && isdialuptty(tty))
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syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name);
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#ifdef KERBEROS
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if (!quietlog && notickets == 1 && !noticketsdontcomplain)
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(void)printf("Warning: no Kerberos tickets issued.\n");
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#endif
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#ifdef LOGALL
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/*
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* Syslog each successful login, so we don't have to watch hundreds
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@ -573,7 +503,12 @@ main(argc, argv)
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||||
* We don't need to be root anymore, so
|
||||
* set the user and session context
|
||||
*/
|
||||
if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETALL) != 0) {
|
||||
if (setlogin(username) != 0) {
|
||||
syslog(LOG_ERR, "setlogin(%s): %m - exiting", username);
|
||||
exit(1);
|
||||
}
|
||||
if (setusercontext(lc, pwd, pwd->pw_uid,
|
||||
LOGIN_SETALL & ~LOGIN_SETLOGIN) != 0) {
|
||||
syslog(LOG_ERR, "setusercontext() failed - exiting");
|
||||
exit(1);
|
||||
}
|
||||
@ -585,13 +520,9 @@ main(argc, argv)
|
||||
else {
|
||||
(void)setenv("TERM", stypeof(tty), 0); /* Fallback doesn't */
|
||||
}
|
||||
(void)setenv("LOGNAME", pwd->pw_name, 1);
|
||||
(void)setenv("USER", pwd->pw_name, 1);
|
||||
(void)setenv("LOGNAME", username, 1);
|
||||
(void)setenv("USER", username, 1);
|
||||
(void)setenv("PATH", rootlogin ? _PATH_STDPATH : _PATH_DEFPATH, 0);
|
||||
#ifdef KERBEROS
|
||||
if (krbtkfile_env)
|
||||
(void)setenv("KRBTKFILE", krbtkfile_env, 1);
|
||||
#endif
|
||||
|
||||
if (!quietlog) {
|
||||
char *cw;
|
||||
@ -646,6 +577,114 @@ main(argc, argv)
|
||||
err(1, "%s", shell);
|
||||
}
|
||||
|
||||
static int
|
||||
auth_traditional()
|
||||
{
|
||||
int rval;
|
||||
char *p;
|
||||
char *ep;
|
||||
char *salt;
|
||||
|
||||
rval = 1;
|
||||
salt = pwd != NULL ? pwd->pw_passwd : "xx";
|
||||
|
||||
p = getpass("Password:");
|
||||
ep = crypt(p, salt);
|
||||
|
||||
if (pwd) {
|
||||
if (!p[0] && pwd->pw_passwd[0])
|
||||
ep = ":";
|
||||
if (strcmp(ep, pwd->pw_passwd) == 0)
|
||||
rval = 0;
|
||||
}
|
||||
|
||||
/* clear entered password */
|
||||
memset(p, 0, strlen(p));
|
||||
return rval;
|
||||
}
|
||||
|
||||
/*
|
||||
* Attempt to authenticate the user using PAM. Returns 0 if the user is
|
||||
* authenticated, or 1 if not authenticated. If some sort of PAM system
|
||||
* error occurs (e.g., the "/etc/pam.conf" file is missing) then this
|
||||
* function returns -1. This can be used as an indication that we should
|
||||
* fall back to a different authentication mechanism.
|
||||
*/
|
||||
static int
|
||||
auth_pam()
|
||||
{
|
||||
pam_handle_t *pamh = NULL;
|
||||
const char *tmpl_user;
|
||||
const void *item;
|
||||
int rval;
|
||||
int e;
|
||||
static struct pam_conv conv = { misc_conv, NULL };
|
||||
|
||||
if ((e = pam_start("login", username, &conv, &pamh)) != PAM_SUCCESS) {
|
||||
syslog(LOG_ERR, "pam_start: %s", pam_strerror(pamh, e));
|
||||
return -1;
|
||||
}
|
||||
if ((e = pam_set_item(pamh, PAM_TTY, tty)) != PAM_SUCCESS) {
|
||||
syslog(LOG_ERR, "pam_set_item(PAM_TTY): %s",
|
||||
pam_strerror(pamh, e));
|
||||
return -1;
|
||||
}
|
||||
if (hostname != NULL &&
|
||||
(e = pam_set_item(pamh, PAM_RHOST, full_hostname)) != PAM_SUCCESS) {
|
||||
syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s",
|
||||
pam_strerror(pamh, e));
|
||||
return -1;
|
||||
}
|
||||
e = pam_authenticate(pamh, 0);
|
||||
switch (e) {
|
||||
|
||||
case PAM_SUCCESS:
|
||||
/*
|
||||
* With PAM we support the concept of a "template"
|
||||
* user. The user enters a login name which is
|
||||
* authenticated by PAM, usually via a remote service
|
||||
* such as RADIUS or TACACS+. If authentication
|
||||
* succeeds, a different but related "template" name
|
||||
* is used for setting the credentials, shell, and
|
||||
* home directory. The name the user enters need only
|
||||
* exist on the remote authentication server, but the
|
||||
* template name must be present in the local password
|
||||
* database.
|
||||
*
|
||||
* This is supported by two various mechanisms in the
|
||||
* individual modules. However, from the application's
|
||||
* point of view, the template user is always passed
|
||||
* back as a changed value of the PAM_USER item.
|
||||
*/
|
||||
if ((e = pam_get_item(pamh, PAM_USER, &item)) ==
|
||||
PAM_SUCCESS) {
|
||||
tmpl_user = (const char *) item;
|
||||
if (strcmp(username, tmpl_user) != 0)
|
||||
pwd = getpwnam(tmpl_user);
|
||||
} else
|
||||
syslog(LOG_ERR, "Couldn't get PAM_USER: %s",
|
||||
pam_strerror(pamh, e));
|
||||
rval = 0;
|
||||
break;
|
||||
|
||||
case PAM_AUTH_ERR:
|
||||
case PAM_USER_UNKNOWN:
|
||||
case PAM_MAXTRIES:
|
||||
rval = 1;
|
||||
break;
|
||||
|
||||
default:
|
||||
syslog(LOG_ERR, "auth_pam: %s", pam_strerror(pamh, e));
|
||||
rval = -1;
|
||||
break;
|
||||
}
|
||||
if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
|
||||
syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
|
||||
rval = -1;
|
||||
}
|
||||
return rval;
|
||||
}
|
||||
|
||||
static void
|
||||
usage()
|
||||
{
|
||||
|
||||
Loading…
Reference in New Issue
Block a user