1261 lines
31 KiB
C
1261 lines
31 KiB
C
/*
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* Copyright 1989 - 1994, Julianne Frances Haugh
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* 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. Neither the name of Julianne F. Haugh 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 JULIE HAUGH 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 JULIE HAUGH 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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#include <config.h>
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#include "rcsid.h"
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RCSID(PKG_VER "$Id: login.c,v 1.15 1999/06/07 16:40:45 marekm Exp $")
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#include "prototypes.h"
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#include "defines.h"
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#include <sys/stat.h>
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#include <stdio.h>
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#include <errno.h>
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#include <pwd.h>
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#include <grp.h>
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#if HAVE_UTMPX_H
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#include <utmpx.h>
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#else
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#include <utmp.h>
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#endif
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#include <signal.h>
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#if HAVE_LASTLOG_H
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#include <lastlog.h>
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#else
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#include "lastlog_.h"
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#endif
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#include "faillog.h"
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#include "failure.h"
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#include "pwauth.h"
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#include "getdef.h"
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#include "dialchk.h"
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#ifdef SVR4_SI86_EUA
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#include <sys/proc.h>
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#include <sys/sysi86.h>
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#endif
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#ifdef RADIUS
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/*
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* Support for RADIUS authentication based on a hacked util-linux login
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* source sent to me by Jon Lewis. Not tested. You need to link login
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* with the radauth.c file (not included here - it doesn't have a clear
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* copyright statement, and I don't want to have problems with Debian
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* putting the whole package in non-free because of this). --marekm
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*/
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#include "radlogin.h"
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#endif
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#ifdef UT_ADDR
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#include <netdb.h>
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#endif
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#ifdef USE_PAM_not_yet
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#include "pam_defs.h"
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static const struct pam_conv conv = {
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misc_conv,
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NULL
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};
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static pam_handle_t *pamh = NULL;
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#define PAM_FAIL_CHECK if (retcode != PAM_SUCCESS) { \
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fprintf(stderr,"\n%s\n",PAM_STRERROR(pamh, retcode)); \
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syslog(LOG_ERR,"%s",PAM_STRERROR(pamh, retcode)); \
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pam_end(pamh, retcode); exit(1); \
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}
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#define PAM_END { retcode = pam_close_session(pamh,0); \
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pam_end(pamh,retcode); }
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#endif /* USE_PAM_not_yet */
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/*
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* Needed for MkLinux DR1/2/2.1 - J.
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*/
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#ifndef LASTLOG_FILE
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#define LASTLOG_FILE "/var/log/lastlog"
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#endif
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const char *hostname = "";
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struct passwd pwent;
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#if HAVE_UTMPX_H
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struct utmpx utxent, failent;
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struct utmp utent;
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#else
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struct utmp utent, failent;
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#endif
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struct lastlog lastlog;
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static int pflg = 0;
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static int fflg = 0;
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#ifdef RLOGIN
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static int rflg = 0;
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#else
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#define rflg 0
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#endif
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static int hflg = 0;
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static int preauth_flag = 0;
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/*
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* Global variables.
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*/
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static char *Prog;
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static int amroot;
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static int timeout;
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/*
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* External identifiers.
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*/
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extern char **newenvp;
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extern size_t newenvc;
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extern char *tz P_((const char *));
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extern void subsystem P_((const struct passwd *));
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extern void dolastlog P_((struct lastlog *, const struct passwd *, const char *, const char *));
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extern int optind;
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extern char *optarg;
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extern char **environ;
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extern int login_access P_((const char *user, const char *from));
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extern void login_fbtab P_((const char *tty, uid_t uid, gid_t gid));
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#ifndef ALARM
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#define ALARM 60
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#endif
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#ifndef RETRIES
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#define RETRIES 3
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#endif
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static struct faillog faillog;
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#define NO_SHADOW "no shadow password for `%s'%s\n"
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#define BAD_PASSWD "invalid password for `%s'%s\n"
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#define BAD_DIALUP "invalid dialup password for `%s' on `%s'\n"
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#define BAD_TIME "invalid login time for `%s'%s\n"
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#define BAD_ROOT_LOGIN "ILLEGAL ROOT LOGIN%s\n"
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#define ROOT_LOGIN "ROOT LOGIN%s\n"
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#define FAILURE_CNT "exceeded failure limit for `%s'%s\n"
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#define REG_LOGIN "`%s' logged in%s\n"
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#define LOGIN_REFUSED "LOGIN `%s' REFUSED%s\n"
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#define REENABLED2 \
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"login `%s' re-enabled after temporary lockout (%d failures).\n"
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#define MANY_FAILS "REPEATED login failures%s\n"
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/* local function prototypes */
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static void usage P_((void));
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static void setup_tty P_((void));
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static void bad_time_notify P_((void));
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static void check_flags P_((int, char * const *));
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static void check_nologin P_((void));
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static void init_env P_((void));
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static RETSIGTYPE alarm_handler P_((int));
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int main P_((int, char **));
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/*
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* usage - print login command usage and exit
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*
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* login [ name ]
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* login -r hostname (for rlogind)
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* login -h hostname (for telnetd, etc.)
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* login -f name (for pre-authenticated login: datakit, xterm, etc.)
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*/
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static void
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usage(void)
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{
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fprintf(stderr, _("usage: %s [-p] [name]\n"), Prog);
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if (!amroot)
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exit(1);
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fprintf(stderr, _(" %s [-p] [-h host] [-f name]\n"), Prog);
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#ifdef RLOGIN
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fprintf(stderr, _(" %s [-p] -r host\n"), Prog);
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#endif
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exit(1);
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}
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static void
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setup_tty(void)
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{
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TERMIO termio;
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GTTY(0, &termio); /* get terminal characteristics */
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/*
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* Add your favorite terminal modes here ...
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*/
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#ifndef USE_SGTTY
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termio.c_lflag |= ISIG|ICANON|ECHO|ECHOE;
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termio.c_iflag |= ICRNL;
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#if defined(ECHOKE) && defined(ECHOCTL)
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termio.c_lflag |= ECHOKE|ECHOCTL;
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#endif
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#if defined(ECHOPRT) && defined(NOFLSH) && defined(TOSTOP)
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termio.c_lflag &= ~(ECHOPRT|NOFLSH|TOSTOP);
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#endif
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#ifdef ONLCR
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termio.c_oflag |= ONLCR;
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#endif
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#ifdef SUN4
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/*
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* Terminal setup for SunOS 4.1 courtesy of Steve Allen
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* at UCO/Lick.
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*/
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termio.c_cc[VEOF] = '\04';
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termio.c_cflag &= ~CSIZE;
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termio.c_cflag |= (PARENB|CS7);
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termio.c_lflag |= (ISIG|ICANON|ECHO|IEXTEN);
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termio.c_iflag |= (BRKINT|IGNPAR|ISTRIP|IMAXBEL|ICRNL|IXON);
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termio.c_iflag &= ~IXANY;
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termio.c_oflag |= (XTABS|OPOST|ONLCR);
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#endif
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#if 0
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termio.c_cc[VERASE] = getdef_num("ERASECHAR", '\b');
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termio.c_cc[VKILL] = getdef_num("KILLCHAR", '\025');
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#else
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/* leave these values unchanged if not specified in login.defs */
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termio.c_cc[VERASE] = getdef_num("ERASECHAR", termio.c_cc[VERASE]);
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termio.c_cc[VKILL] = getdef_num("KILLCHAR", termio.c_cc[VKILL]);
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#endif
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/*
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* ttymon invocation prefers this, but these settings won't come into
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* effect after the first username login
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*/
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#else
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#endif /* !BSD */
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STTY(0, &termio);
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}
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/*
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* Tell the user that this is not the right time to login at this tty
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*/
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static void
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bad_time_notify(void)
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{
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#ifdef HUP_MESG_FILE
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FILE *mfp;
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if ((mfp = fopen(HUP_MESG_FILE, "r")) != NULL) {
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int c;
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while ((c = fgetc(mfp)) != EOF) {
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if (c == '\n')
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putchar('\r');
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putchar(c);
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}
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fclose(mfp);
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} else
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#endif
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printf(_("Invalid login time\n"));
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fflush(stdout);
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}
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static void
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check_flags(int argc, char * const *argv)
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{
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int arg;
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/*
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* Check the flags for proper form. Every argument starting with
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* "-" must be exactly two characters long. This closes all the
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* clever rlogin, telnet, and getty holes.
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*/
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for (arg = 1; arg < argc; arg++) {
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if (argv[arg][0] == '-' && strlen(argv[arg]) > 2)
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usage();
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}
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}
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static void
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check_nologin(void)
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{
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char *fname;
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/*
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* Check to see if system is turned off for non-root users.
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* This would be useful to prevent users from logging in
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* during system maintenance. We make sure the message comes
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* out for root so she knows to remove the file if she's
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* forgotten about it ...
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*/
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fname = getdef_str("NOLOGINS_FILE");
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if (fname != NULL && access(fname, F_OK) == 0) {
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FILE *nlfp;
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int c;
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/*
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* Cat the file if it can be opened, otherwise just
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* print a default message
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*/
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if ((nlfp = fopen (fname, "r"))) {
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while ((c = getc (nlfp)) != EOF) {
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if (c == '\n')
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putchar ('\r');
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putchar (c);
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}
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fflush (stdout);
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fclose (nlfp);
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} else
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printf(_("\nSystem closed for routine maintenance\n"));
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/*
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* Non-root users must exit. Root gets the message, but
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* gets to login.
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*/
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if (pwent.pw_uid != 0) {
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closelog();
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exit(0);
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}
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printf(_("\n[Disconnect bypassed -- root login allowed.]\n"));
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}
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}
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static void
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init_env(void)
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{
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char *cp, *tmp;
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if ((tmp = getenv("LANG"))) {
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addenv("LANG", tmp);
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}
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/*
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* Add the timezone environmental variable so that time functions
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* work correctly.
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*/
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if ((tmp = getenv("TZ"))) {
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addenv("TZ", tmp);
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} else if ((cp = getdef_str("ENV_TZ")))
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addenv(*cp == '/' ? tz(cp) : cp, NULL);
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/*
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* Add the clock frequency so that profiling commands work
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* correctly.
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*/
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if ((tmp = getenv("HZ"))) {
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addenv("HZ", tmp);
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} else if ((cp = getdef_str("ENV_HZ")))
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addenv(cp, NULL);
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}
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static RETSIGTYPE
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alarm_handler(int sig)
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{
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fprintf(stderr, _("\nLogin timed out after %d seconds.\n"), timeout);
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exit(0);
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}
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/*
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* login - create a new login session for a user
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*
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* login is typically called by getty as the second step of a
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* new user session. getty is responsible for setting the line
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* characteristics to a reasonable set of values and getting
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* the name of the user to be logged in. login may also be
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* called to create a new user session on a pty for a variety
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* of reasons, such as X servers or network logins.
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*
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* the flags which login supports are
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*
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* -p - preserve the environment
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* -r - perform autologin protocol for rlogin
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* -f - do not perform authentication, user is preauthenticated
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* -h - the name of the remote host
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*/
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int
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main(int argc, char **argv)
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{
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char username[32];
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char tty[BUFSIZ];
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#ifdef RLOGIN
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char term[128] = "";
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#endif
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#ifdef HAVE_STRFTIME
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char ptime[80];
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#endif
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int reason = PW_LOGIN;
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int delay;
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int retries;
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int failed;
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int flag;
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int subroot = 0;
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int is_console;
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const char *cp;
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char *tmp;
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char fromhost[512];
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struct passwd *pwd;
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char **envp = environ;
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static char temp_pw[2];
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static char temp_shell[] = "/bin/sh";
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#ifdef USE_PAM_not_yet
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int retcode;
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pid_t child;
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#endif /* USE_PAM_not_yet */
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#ifdef SHADOWPWD
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struct spwd *spwd=NULL;
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#endif
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#ifdef RADIUS
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RAD_USER_DATA rad_user_data;
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int is_rad_login;
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#endif
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#if defined(RADIUS) || defined(DES_RPC) || defined(KERBEROS)
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/* from pwauth.c */
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extern char *clear_pass;
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extern int wipe_clear_pass;
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/*
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* We may need the password later, don't want pw_auth() to wipe it
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* (we do it ourselves when it is no longer needed). --marekm
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*/
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wipe_clear_pass = 0;
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#endif
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/*
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* Some quick initialization.
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*/
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sanitize_env();
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setlocale(LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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textdomain(PACKAGE);
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initenv();
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username[0] = '\0';
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amroot = (getuid() == 0);
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Prog = Basename(argv[0]);
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check_flags(argc, argv);
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while ((flag = getopt(argc, argv, "d:f:h:pr:")) != EOF) {
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switch (flag) {
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case 'p':
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pflg++;
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break;
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case 'f':
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/*
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* username must be a separate token
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* (-f root, *not* -froot). --marekm
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*/
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if (optarg != argv[optind - 1])
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usage();
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fflg++;
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STRFCPY(username, optarg);
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break;
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#ifdef RLOGIN
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case 'r':
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rflg++;
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hostname = optarg;
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reason = PW_RLOGIN;
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break;
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#endif
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case 'h':
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hflg++;
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hostname = optarg;
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reason = PW_TELNET;
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break;
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case 'd':
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/* "-d device" ignored for compatibility */
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break;
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default:
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usage();
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}
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}
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|
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#ifdef RLOGIN
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/*
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* Neither -h nor -f should be combined with -r.
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*/
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if (rflg && (hflg || fflg))
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usage();
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#endif
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/*
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* Allow authentication bypass only if real UID is zero.
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*/
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if ((rflg || fflg || hflg) && !amroot) {
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fprintf(stderr, _("%s: permission denied\n"), Prog);
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exit(1);
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}
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if (!isatty(0) || !isatty(1) || !isatty(2))
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exit(1); /* must be a terminal */
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#if 0
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/*
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* Get the utmp file entry and get the tty name from it. The
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* current process ID must match the process ID in the utmp
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* file if there are no additional flags on the command line.
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*/
|
|
checkutmp(!rflg && !fflg && !hflg);
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#else
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/*
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|
* Be picky if run by normal users (possible if installed setuid
|
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* root), but not if run by root. This way it still allows logins
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* even if your getty is broken, or if something corrupts utmp,
|
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* but users must "exec login" which will use the existing utmp
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* entry (will not overwrite remote hostname). --marekm
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|
*/
|
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checkutmp(!amroot);
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#endif
|
|
STRFCPY(tty, utent.ut_line);
|
|
is_console = console(tty);
|
|
|
|
if (rflg || hflg) {
|
|
#ifdef UT_ADDR
|
|
struct hostent *he;
|
|
|
|
/*
|
|
* Fill in the ut_addr field (remote login IP address).
|
|
* XXX - login from util-linux does it, but this is not
|
|
* the right place to do it. The program that starts
|
|
* login (telnetd, rlogind) knows the IP address, so it
|
|
* should create the utmp entry and fill in ut_addr.
|
|
* gethostbyname() is not 100% reliable (the remote host
|
|
* may be unknown, etc.). --marekm
|
|
*/
|
|
if ((he = gethostbyname(hostname))) {
|
|
utent.ut_addr = *((int32_t *)(he->h_addr_list[0]));
|
|
#endif
|
|
#ifdef UT_HOST
|
|
strncpy(utent.ut_host, hostname, sizeof(utent.ut_host));
|
|
#endif
|
|
#if HAVE_UTMPX_H
|
|
strncpy(utxent.ut_host, hostname, sizeof(utxent.ut_host));
|
|
#endif
|
|
/*
|
|
* Add remote hostname to the environment. I think
|
|
* (not sure) I saw it once on Irix. --marekm
|
|
*/
|
|
addenv("REMOTEHOST", hostname);
|
|
}
|
|
#ifdef __linux__
|
|
/* workaround for init/getty leaving junk in ut_host at least in some
|
|
version of RedHat. --marekm */
|
|
else if (amroot)
|
|
memzero(utent.ut_host, sizeof utent.ut_host);
|
|
#endif
|
|
if (hflg && fflg) {
|
|
reason = PW_RLOGIN;
|
|
preauth_flag++;
|
|
}
|
|
#ifdef RLOGIN
|
|
if (rflg && do_rlogin(hostname, username, sizeof username, term, sizeof term))
|
|
preauth_flag++;
|
|
#endif
|
|
|
|
openlog("login", LOG_PID|LOG_CONS|LOG_NOWAIT, LOG_AUTH);
|
|
|
|
setup_tty();
|
|
|
|
umask(getdef_num("UMASK", 077));
|
|
|
|
{
|
|
/*
|
|
* Use the ULIMIT in the login.defs file, and if
|
|
* there isn't one, use the default value. The
|
|
* user may have one for themselves, but otherwise,
|
|
* just take what you get.
|
|
*/
|
|
|
|
long limit = getdef_long("ULIMIT", -1L);
|
|
|
|
if (limit != -1)
|
|
set_filesize_limit(limit);
|
|
}
|
|
|
|
/*
|
|
* The entire environment will be preserved if the -p flag
|
|
* is used.
|
|
*/
|
|
|
|
if (pflg)
|
|
while (*envp) /* add inherited environment, */
|
|
addenv(*envp++, NULL); /* some variables change later */
|
|
|
|
#ifdef RLOGIN
|
|
if (term[0] != '\0')
|
|
addenv("TERM", term);
|
|
else
|
|
#endif
|
|
/* preserve TERM from getty */
|
|
if (!pflg && (tmp = getenv("TERM")))
|
|
addenv("TERM", tmp);
|
|
|
|
init_env();
|
|
|
|
if (optind < argc) { /* get the user name */
|
|
if (rflg || fflg)
|
|
usage();
|
|
|
|
#ifdef SVR4
|
|
/*
|
|
* The "-h" option can't be used with a command-line username,
|
|
* because telnetd invokes us as: login -h host TERM=...
|
|
*/
|
|
|
|
if (! hflg)
|
|
#endif
|
|
{
|
|
STRFCPY(username, argv[optind]);
|
|
strzero(argv[optind]);
|
|
++optind;
|
|
}
|
|
}
|
|
#ifdef SVR4
|
|
/*
|
|
* check whether ttymon has done the prompt for us already
|
|
*/
|
|
|
|
{
|
|
char *ttymon_prompt;
|
|
|
|
if ((ttymon_prompt = getenv("TTYPROMPT")) != NULL &&
|
|
(*ttymon_prompt != 0)) {
|
|
/* read name, without prompt */
|
|
login_prompt((char *)0, username, sizeof username);
|
|
}
|
|
}
|
|
#endif /* SVR4 */
|
|
if (optind < argc) /* now set command line variables */
|
|
set_env(argc - optind, &argv[optind]);
|
|
|
|
if (rflg || hflg)
|
|
cp = hostname;
|
|
else
|
|
#ifdef UT_HOST
|
|
if (utent.ut_host[0])
|
|
cp = utent.ut_host;
|
|
else
|
|
#endif
|
|
#if HAVE_UTMPX_H
|
|
if (utxent.ut_host[0])
|
|
cp = utxent.ut_host;
|
|
else
|
|
#endif
|
|
cp = "";
|
|
|
|
if (*cp)
|
|
snprintf(fromhost, sizeof fromhost,
|
|
_(" on `%.100s' from `%.200s'"), tty, cp);
|
|
else
|
|
snprintf(fromhost, sizeof fromhost, _(" on `%.100s'"), tty);
|
|
|
|
top:
|
|
/* only allow ALARM sec. for login */
|
|
signal(SIGALRM, alarm_handler);
|
|
timeout = getdef_num("LOGIN_TIMEOUT", ALARM);
|
|
if (timeout > 0)
|
|
alarm(timeout);
|
|
|
|
environ = newenvp; /* make new environment active */
|
|
delay = getdef_num("FAIL_DELAY", 1);
|
|
retries = getdef_num("LOGIN_RETRIES", RETRIES);
|
|
|
|
#ifdef USE_PAM_not_yet
|
|
retcode = pam_start("login", username, &conv, &pamh);
|
|
if(retcode != PAM_SUCCESS) {
|
|
fprintf(stderr,"login: PAM Failure, aborting: %s\n",
|
|
PAM_STRERROR(pamh, retcode));
|
|
syslog(LOG_ERR,"Couldn't initialize PAM: %s",
|
|
PAM_STRERROR(pamh, retcode));
|
|
exit(99);
|
|
}
|
|
/* hostname & tty are either set to NULL or their correct values,
|
|
depending on how much we know */
|
|
retcode = pam_set_item(pamh, PAM_RHOST, hostname);
|
|
PAM_FAIL_CHECK;
|
|
retcode = pam_set_item(pamh, PAM_TTY, tty);
|
|
PAM_FAIL_CHECK;
|
|
|
|
/* if fflg == 1, then the user has already been authenticated */
|
|
if (!fflg || (getuid() != 0)) {
|
|
int failcount = 0;
|
|
|
|
/* there may be better ways to deal with some of these
|
|
conditions, but at least this way I don't think we'll
|
|
be giving away information... */
|
|
/* Perhaps someday we can trust that all PAM modules will
|
|
pay attention to failure count and get rid of
|
|
MAX_LOGIN_TRIES? */
|
|
|
|
retcode = pam_authenticate(pamh, 0);
|
|
while ((failcount++ < retries) &&
|
|
((retcode == PAM_AUTH_ERR) ||
|
|
(retcode == PAM_USER_UNKNOWN) ||
|
|
(retcode == PAM_CRED_INSUFFICIENT) ||
|
|
(retcode == PAM_AUTHINFO_UNAVAIL))) {
|
|
pam_get_item(pamh, PAM_USER, (const void **) &username);
|
|
syslog(LOG_NOTICE,"FAILED LOGIN %d FROM %s FOR %s, %s",
|
|
failcount, hostname, username,
|
|
PAM_STRERROR(pamh, retcode));
|
|
fprintf(stderr,"Login incorrect\n\n");
|
|
pam_set_item(pamh,PAM_USER,NULL);
|
|
retcode = pam_authenticate(pamh, 0);
|
|
}
|
|
|
|
if (retcode != PAM_SUCCESS) {
|
|
pam_get_item(pamh, PAM_USER, (const void **) &username);
|
|
|
|
if (retcode == PAM_MAXTRIES)
|
|
syslog(LOG_NOTICE,
|
|
"TOO MANY LOGIN TRIES (%d) FROM %s FOR %s, %s",
|
|
failcount, hostname, username,
|
|
PAM_STRERROR(pamh, retcode));
|
|
else
|
|
syslog(LOG_NOTICE,
|
|
"FAILED LOGIN SESSION FROM %s FOR %s, %s",
|
|
hostname, username,
|
|
PAM_STRERROR(pamh, retcode));
|
|
|
|
fprintf(stderr,"\nLogin incorrect\n");
|
|
pam_end(pamh, retcode);
|
|
exit(0);
|
|
}
|
|
|
|
retcode = pam_acct_mgmt(pamh, 0);
|
|
|
|
if(retcode == PAM_NEW_AUTHTOK_REQD) {
|
|
retcode = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK);
|
|
}
|
|
|
|
PAM_FAIL_CHECK;
|
|
}
|
|
|
|
/* Grab the user information out of the password file for future usage
|
|
First get the username that we are actually using, though.
|
|
*/
|
|
retcode = pam_get_item(pamh, PAM_USER, (const void **) &username);
|
|
setpwent();
|
|
pwd = getpwnam(username);
|
|
if (pwd)
|
|
initgroups(username, pwd->pw_gid);
|
|
|
|
retcode = pam_setcred(pamh, PAM_ESTABLISH_CRED);
|
|
PAM_FAIL_CHECK;
|
|
|
|
retcode = pam_open_session(pamh, 0);
|
|
PAM_FAIL_CHECK;
|
|
|
|
|
|
#else /* ! USE_PAM_not_yet */
|
|
while (1) { /* repeatedly get login/password pairs */
|
|
failed = 0; /* haven't failed authentication yet */
|
|
#ifdef RADIUS
|
|
is_rad_login = 0;
|
|
#endif
|
|
if (! username[0]) { /* need to get a login id */
|
|
if (subroot) {
|
|
closelog ();
|
|
exit (1);
|
|
}
|
|
preauth_flag = 0;
|
|
#ifndef LOGIN_PROMPT
|
|
#ifdef __linux__ /* hostname login: - like in util-linux login */
|
|
login_prompt(_("\n%s login: "), username, sizeof username);
|
|
#else
|
|
login_prompt(_("login: "), username, sizeof username);
|
|
#endif
|
|
#else
|
|
login_prompt(LOGIN_PROMPT, username, sizeof username);
|
|
#endif
|
|
continue;
|
|
}
|
|
if (! (pwd = getpwnam(username))) {
|
|
pwent.pw_name = username;
|
|
strcpy(temp_pw, "!");
|
|
pwent.pw_passwd = temp_pw;
|
|
pwent.pw_shell = temp_shell;
|
|
|
|
preauth_flag = 0;
|
|
failed = 1;
|
|
} else {
|
|
pwent = *pwd;
|
|
}
|
|
#ifdef SHADOWPWD
|
|
spwd = NULL;
|
|
if (pwd && strcmp(pwd->pw_passwd, SHADOW_PASSWD_STRING) == 0) {
|
|
spwd = getspnam(username);
|
|
if (spwd)
|
|
pwent.pw_passwd = spwd->sp_pwdp;
|
|
else
|
|
SYSLOG((LOG_WARN, NO_SHADOW, username, fromhost));
|
|
}
|
|
#endif /* SHADOWPWD */
|
|
|
|
/*
|
|
* If the encrypted password begins with a "!", the account
|
|
* is locked and the user cannot login, even if they have
|
|
* been "pre-authenticated."
|
|
*/
|
|
if (pwent.pw_passwd[0] == '!' || pwent.pw_passwd[0] == '*')
|
|
failed = 1;
|
|
|
|
/*
|
|
* The -r and -f flags provide a name which has already
|
|
* been authenticated by some server.
|
|
*/
|
|
if (preauth_flag)
|
|
goto auth_ok;
|
|
|
|
/*
|
|
* No password prompt if logging in from listed ttys
|
|
* (local console). Passwords don't help much if you
|
|
* have physical access to the hardware anyway...
|
|
* Suggested by Pavel Machek <pavel@bug.ucw.cz>.
|
|
* NOTE: password still required for root logins!
|
|
*/
|
|
if (pwd && (pwent.pw_uid != 0)
|
|
&& is_listed("NO_PASSWORD_CONSOLE", tty, 0)) {
|
|
temp_pw[0] = '\0';
|
|
pwent.pw_passwd = temp_pw;
|
|
}
|
|
|
|
if (pw_auth(pwent.pw_passwd, username, reason, (char *) 0) == 0)
|
|
goto auth_ok;
|
|
|
|
#ifdef RADIUS
|
|
/*
|
|
* If normal passwd authentication didn't work, try radius.
|
|
*/
|
|
|
|
if (failed) {
|
|
pwd = rad_authenticate(&rad_user_data, username,
|
|
clear_pass ? clear_pass : "");
|
|
if (pwd) {
|
|
is_rad_login = 1;
|
|
pwent = *pwd;
|
|
failed = 0;
|
|
goto auth_ok;
|
|
}
|
|
}
|
|
#endif /* RADIUS */
|
|
|
|
/*
|
|
* Don't log unknown usernames - I mistyped the password for
|
|
* username at least once... Should probably use LOG_AUTHPRIV
|
|
* for those who really want to log them. --marekm
|
|
*/
|
|
SYSLOG((LOG_WARN, BAD_PASSWD,
|
|
(pwd || getdef_bool("LOG_UNKFAIL_ENAB")) ?
|
|
username : "UNKNOWN", fromhost));
|
|
failed = 1;
|
|
|
|
auth_ok:
|
|
/*
|
|
* This is the point where all authenticated users
|
|
* wind up. If you reach this far, your password has
|
|
* been authenticated and so on.
|
|
*/
|
|
|
|
#if defined(RADIUS) && !(defined(DES_RPC) || defined(KERBEROS))
|
|
if (clear_pass) {
|
|
strzero(clear_pass);
|
|
clear_pass = NULL;
|
|
}
|
|
#endif
|
|
|
|
if (getdef_bool("DIALUPS_CHECK_ENAB")) {
|
|
alarm (30);
|
|
|
|
if (! dialcheck (tty, pwent.pw_shell[0] ?
|
|
pwent.pw_shell:"/bin/sh")) {
|
|
SYSLOG((LOG_WARN, BAD_DIALUP, username, tty));
|
|
failed = 1;
|
|
}
|
|
}
|
|
|
|
if (! failed && pwent.pw_name && pwent.pw_uid == 0 &&
|
|
! is_console) {
|
|
SYSLOG((LOG_CRIT, BAD_ROOT_LOGIN, fromhost));
|
|
failed = 1;
|
|
}
|
|
#ifdef LOGIN_ACCESS
|
|
if (!failed && !login_access(username, *hostname ? hostname : tty)) {
|
|
SYSLOG((LOG_WARN, LOGIN_REFUSED, username, fromhost));
|
|
failed = 1;
|
|
}
|
|
#endif
|
|
if (pwd && getdef_bool("FAILLOG_ENAB") &&
|
|
! failcheck (pwent.pw_uid, &faillog, failed)) {
|
|
SYSLOG((LOG_CRIT, FAILURE_CNT, username, fromhost));
|
|
failed = 1;
|
|
}
|
|
if (! failed)
|
|
break;
|
|
|
|
/* don't log non-existent users */
|
|
if (pwd && getdef_bool("FAILLOG_ENAB"))
|
|
failure (pwent.pw_uid, tty, &faillog);
|
|
if (getdef_str("FTMP_FILE") != NULL) {
|
|
const char *failent_user;
|
|
|
|
#if HAVE_UTMPX_H
|
|
failent = utxent;
|
|
gettimeofday(&(failent.ut_tv), NULL);
|
|
#else
|
|
failent = utent;
|
|
time(&failent.ut_time);
|
|
#endif
|
|
if (pwd) {
|
|
failent_user = pwent.pw_name;
|
|
} else {
|
|
if (getdef_bool("LOG_UNKFAIL_ENAB"))
|
|
failent_user = username;
|
|
else
|
|
failent_user = "UNKNOWN";
|
|
}
|
|
strncpy(failent.ut_user, failent_user, sizeof(failent.ut_user));
|
|
#ifdef USER_PROCESS
|
|
failent.ut_type = USER_PROCESS;
|
|
#endif
|
|
failtmp(&failent);
|
|
}
|
|
memzero(username, sizeof username);
|
|
|
|
if (--retries <= 0)
|
|
SYSLOG((LOG_CRIT, MANY_FAILS, fromhost));
|
|
#if 1
|
|
/*
|
|
* If this was a passwordless account and we get here,
|
|
* login was denied (securetty, faillog, etc.). There
|
|
* was no password prompt, so do it now (will always
|
|
* fail - the bad guys won't see that the passwordless
|
|
* account exists at all). --marekm
|
|
*/
|
|
|
|
if (pwent.pw_passwd[0] == '\0')
|
|
pw_auth("!", username, reason, (char *) 0);
|
|
#endif
|
|
/*
|
|
* Wait a while (a la SVR4 /usr/bin/login) before attempting
|
|
* to login the user again. If the earlier alarm occurs
|
|
* before the sleep() below completes, login will exit.
|
|
*/
|
|
|
|
if (delay > 0)
|
|
sleep(delay);
|
|
|
|
puts(_("Login incorrect"));
|
|
|
|
/* allow only one attempt with -r or -f */
|
|
if (rflg || fflg || retries <= 0) {
|
|
closelog();
|
|
exit(1);
|
|
}
|
|
} /* while (1) */
|
|
#endif /* ! USE_PAM_not_yet */
|
|
(void) alarm (0); /* turn off alarm clock */
|
|
#if 1
|
|
/*
|
|
* porttime checks moved here, after the user has been
|
|
* authenticated. now prints a message, as suggested
|
|
* by Ivan Nejgebauer <ian@unsux.ns.ac.yu>. --marekm
|
|
*/
|
|
if (getdef_bool("PORTTIME_CHECKS_ENAB") &&
|
|
!isttytime(pwent.pw_name, tty, time ((time_t *) 0))) {
|
|
SYSLOG((LOG_WARN, BAD_TIME, username, fromhost));
|
|
closelog();
|
|
bad_time_notify();
|
|
exit(1);
|
|
}
|
|
#endif
|
|
|
|
check_nologin();
|
|
|
|
if (getenv("IFS")) /* don't export user IFS ... */
|
|
addenv("IFS= \t\n", NULL); /* ... instead, set a safe IFS */
|
|
|
|
setutmp(username, tty, hostname); /* make entry in utmp & wtmp files */
|
|
if (pwent.pw_shell[0] == '*') { /* subsystem root */
|
|
subsystem (&pwent); /* figure out what to execute */
|
|
subroot++; /* say i was here again */
|
|
endpwent (); /* close all of the file which were */
|
|
endgrent (); /* open in the original rooted file */
|
|
#ifdef SHADOWPWD
|
|
endspent (); /* system. they will be re-opened */
|
|
#endif
|
|
#ifdef SHADOWGRP
|
|
endsgent (); /* in the new rooted file system */
|
|
#endif
|
|
goto top; /* go do all this all over again */
|
|
}
|
|
if (getdef_bool("LASTLOG_ENAB")) /* give last login and log this one */
|
|
dolastlog(&lastlog, &pwent, utent.ut_line, hostname);
|
|
|
|
#ifdef SVR4_SI86_EUA
|
|
sysi86(SI86LIMUSER, EUA_ADD_USER); /* how do we test for fail? */
|
|
#endif
|
|
|
|
#ifdef AGING
|
|
/*
|
|
* Have to do this while we still have root privileges, otherwise
|
|
* we don't have access to /etc/shadow. expire() closes password
|
|
* files, and changes to the user in the child before executing
|
|
* the passwd program. --marekm
|
|
*/
|
|
#ifdef SHADOWPWD
|
|
if (spwd) { /* check for age of password */
|
|
if (expire (&pwent, spwd)) {
|
|
pwd = getpwnam(username);
|
|
spwd = getspnam(username);
|
|
if (pwd)
|
|
pwent = *pwd;
|
|
}
|
|
}
|
|
#else
|
|
#ifdef ATT_AGE
|
|
if (pwent.pw_age && pwent.pw_age[0]) {
|
|
if (expire (&pwent)) {
|
|
pwd = getpwnam(username);
|
|
if (pwd)
|
|
pwent = *pwd;
|
|
}
|
|
}
|
|
#endif /* ATT_AGE */
|
|
#endif /* SHADOWPWD */
|
|
#endif /* AGING */
|
|
|
|
#ifdef RADIUS
|
|
if (is_rad_login) {
|
|
char whofilename[128];
|
|
FILE *whofile;
|
|
|
|
snprintf(whofilename, sizeof whofilename, "/var/log/radacct/%.20s", tty);
|
|
whofile = fopen(whofilename, "w");
|
|
if (whofile) {
|
|
fprintf(whofile, "%s\n", username);
|
|
fclose(whofile);
|
|
}
|
|
}
|
|
#endif
|
|
setup_limits(&pwent); /* nice, ulimit etc. */
|
|
chown_tty(tty, &pwent);
|
|
|
|
#ifdef LOGIN_FBTAB
|
|
/*
|
|
* XXX - not supported yet. Change permissions and ownerships of
|
|
* devices like floppy/audio/mouse etc. for console logins, based
|
|
* on /etc/fbtab or /etc/logindevperm configuration files (Suns do
|
|
* this with their framebuffer devices). Problems:
|
|
*
|
|
* - most systems (except BSD) don't have that nice revoke() system
|
|
* call to ensure the previous user didn't leave a process holding
|
|
* one of these devices open or mmap'ed. Any volunteers to do it
|
|
* in Linux?
|
|
*
|
|
* - what to do with different users logged in on different virtual
|
|
* consoles? Maybe permissions should be changed only on user's
|
|
* request, by running a separate (setuid root) program?
|
|
*
|
|
* - init/telnetd/rlogind/whatever should restore permissions after
|
|
* the user logs out.
|
|
*
|
|
* Try the new CONSOLE_GROUPS feature instead. It adds specified
|
|
* groups (like "floppy") to the group set if the user is logged in
|
|
* on the console. This still has the first problem (users leaving
|
|
* processes with these devices open), but doesn't need to change
|
|
* any permissions, just make them 0660 root:floppy etc. --marekm
|
|
*
|
|
* Warning: users can still gain permanent access to these groups
|
|
* unless any user-writable filesystems are mounted with the "nosuid"
|
|
* option. Alternatively, the kernel could be modified to prevent
|
|
* ordinary users from setting the setgid bit on executables.
|
|
*/
|
|
login_fbtab(tty, pwent.pw_uid, pwent.pw_gid);
|
|
#endif
|
|
|
|
if (setup_uid_gid(&pwent, is_console))
|
|
exit(1);
|
|
|
|
#ifdef KERBEROS
|
|
if (clear_pass)
|
|
login_kerberos(username, clear_pass);
|
|
#endif
|
|
#ifdef DES_RPC
|
|
if (clear_pass)
|
|
login_desrpc(clear_pass);
|
|
#endif
|
|
#if defined(DES_RPC) || defined(KERBEROS)
|
|
if (clear_pass)
|
|
strzero(clear_pass);
|
|
#endif
|
|
|
|
setup_env(&pwent); /* set env vars, cd to the home dir */
|
|
|
|
#ifdef USE_PAM_not_yet
|
|
{
|
|
int i;
|
|
const char * const * env;
|
|
|
|
env = (const char * const *) pam_getenvlist(pamh);
|
|
while (env && *env) {
|
|
addenv(*env, NULL);
|
|
env++;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
setlocale(LC_ALL, "");
|
|
bindtextdomain(PACKAGE, LOCALEDIR);
|
|
textdomain(PACKAGE);
|
|
|
|
if (!hushed(&pwent)) {
|
|
addenv("HUSHLOGIN=FALSE", NULL);
|
|
motd(); /* print the message of the day */
|
|
if (getdef_bool("FAILLOG_ENAB") && faillog.fail_cnt != 0) {
|
|
failprint(&faillog);
|
|
/* Reset the lockout times if logged in */
|
|
if (faillog.fail_max &&
|
|
faillog.fail_cnt >= faillog.fail_max) {
|
|
puts(_("Warning: login re-enabled after temporary lockout.\n"));
|
|
SYSLOG((LOG_WARN, REENABLED2, username,
|
|
(int) faillog.fail_cnt));
|
|
}
|
|
}
|
|
if (getdef_bool("LASTLOG_ENAB") && lastlog.ll_time != 0) {
|
|
#ifdef HAVE_STRFTIME
|
|
strftime(ptime, sizeof(ptime),
|
|
"%a %b %e %H:%M:%S %z %Y",
|
|
localtime(&lastlog.ll_time));
|
|
printf(_("Last login: %s on %s"),
|
|
ptime, lastlog.ll_line);
|
|
#else
|
|
printf(_("Last login: %.19s on %s"),
|
|
ctime(&lastlog.ll_time), lastlog.ll_line);
|
|
#endif
|
|
#ifdef HAVE_LL_HOST /* SVR4 || __linux__ || SUN4 */
|
|
if (lastlog.ll_host[0])
|
|
printf(_(" from %.*s"),
|
|
(int) sizeof lastlog.ll_host,
|
|
lastlog.ll_host);
|
|
#endif
|
|
printf(".\n");
|
|
}
|
|
#ifdef AGING
|
|
#ifdef SHADOWPWD
|
|
agecheck(&pwent, spwd);
|
|
#else
|
|
agecheck(&pwent);
|
|
#endif
|
|
#endif /* AGING */
|
|
mailcheck(); /* report on the status of mail */
|
|
} else
|
|
addenv("HUSHLOGIN=TRUE", NULL);
|
|
|
|
if (getdef_str("TTYTYPE_FILE") != NULL && getenv("TERM") == NULL)
|
|
ttytype (tty);
|
|
|
|
signal(SIGQUIT, SIG_DFL); /* default quit signal */
|
|
signal(SIGTERM, SIG_DFL); /* default terminate signal */
|
|
signal(SIGALRM, SIG_DFL); /* default alarm signal */
|
|
signal(SIGHUP, SIG_DFL); /* added this. --marekm */
|
|
|
|
#ifdef USE_PAM_not_yet
|
|
/* We must fork before setuid() because we need to call
|
|
* pam_close_session() as root.
|
|
*/
|
|
/* Note: not true in other (non-Linux) PAM implementations, where
|
|
the parent process of login (init, telnetd, ...) is responsible
|
|
for calling pam_close_session(). This avoids an extra process
|
|
for each login. Maybe we should do this on Linux too? -MM */
|
|
signal(SIGINT, SIG_IGN);
|
|
child = fork();
|
|
if (child < 0) {
|
|
/* error in fork() */
|
|
fprintf(stderr,"login: failure forking: %s", strerror(errno));
|
|
PAM_END;
|
|
exit(0);
|
|
} else if (child) {
|
|
/* parent - wait for child to finish, then cleanup session */
|
|
wait(NULL);
|
|
PAM_END;
|
|
exit(0);
|
|
}
|
|
/* child */
|
|
#endif
|
|
signal(SIGINT, SIG_DFL); /* default interrupt signal */
|
|
|
|
endpwent(); /* stop access to password file */
|
|
endgrent(); /* stop access to group file */
|
|
#ifdef SHADOWPWD
|
|
endspent(); /* stop access to shadow passwd file */
|
|
#endif
|
|
#ifdef SHADOWGRP
|
|
endsgent(); /* stop access to shadow group file */
|
|
#endif
|
|
if (pwent.pw_uid == 0)
|
|
SYSLOG((LOG_NOTICE, ROOT_LOGIN, fromhost));
|
|
else if (getdef_bool("LOG_OK_LOGINS"))
|
|
SYSLOG((LOG_INFO, REG_LOGIN, username, fromhost));
|
|
closelog();
|
|
#ifdef RADIUS
|
|
if (is_rad_login) {
|
|
printf(_("Starting rad_login\n"));
|
|
rad_login(&rad_user_data);
|
|
exit(0);
|
|
}
|
|
#endif
|
|
if ((tmp = getdef_str("FAKE_SHELL")) != NULL) {
|
|
shell(tmp, pwent.pw_shell); /* fake shell */
|
|
}
|
|
shell (pwent.pw_shell, (char *) 0); /* exec the shell finally. */
|
|
/*NOTREACHED*/
|
|
return 0;
|
|
}
|