1136 lines
26 KiB
C
1136 lines
26 KiB
C
/* $NetBSD: login.c,v 1.88 2006/03/08 02:49:18 jnemeth Exp $ */
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/*-
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* Copyright (c) 1980, 1987, 1988, 1991, 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. 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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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT(
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"@(#) Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)login.c 8.4 (Berkeley) 4/2/94";
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#endif
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__RCSID("$NetBSD: login.c,v 1.88 2006/03/08 02:49:18 jnemeth Exp $");
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#endif /* not lint */
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/*
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* login [ name ]
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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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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/file.h>
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#include <sys/wait.h>
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#include <sys/socket.h>
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#include <err.h>
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#include <errno.h>
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#include <grp.h>
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#include <pwd.h>
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#include <setjmp.h>
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#include <signal.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 <syslog.h>
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#include <time.h>
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#include <ttyent.h>
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#include <tzfile.h>
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#include <unistd.h>
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#ifdef SUPPORT_UTMP
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#include <utmp.h>
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#endif
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#ifdef SUPPORT_UTMPX
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#include <utmpx.h>
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#endif
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#include <util.h>
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#ifdef SKEY
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#include <skey.h>
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#endif
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#ifdef KERBEROS5
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#include <krb5/krb5.h>
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#include <com_err.h>
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#endif
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#ifdef LOGIN_CAP
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#include <login_cap.h>
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#endif
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#include <vis.h>
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#include "pathnames.h"
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#ifdef KERBEROS5
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int login_krb5_get_tickets = 1;
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int login_krb4_get_tickets = 0;
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int login_krb5_forwardable_tgt = 0;
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int login_krb5_retain_ccache = 0;
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#endif
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void badlogin(char *);
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void checknologin(char *);
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#ifdef SUPPORT_UTMP
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static void doutmp(void);
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static void dolastlog(int);
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#endif
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#ifdef SUPPORT_UTMPX
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static void doutmpx(void);
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static void dolastlogx(int);
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#endif
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static void update_db(int);
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void getloginname(void);
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void motd(char *);
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int rootterm(char *);
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void sigint(int);
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void sleepexit(int);
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const char *stypeof(const char *);
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void timedout(int);
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#if defined(KERBEROS)
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int klogin(struct passwd *, char *, char *, char *);
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void kdestroy(void);
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#endif
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#ifdef KERBEROS5
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int k5login(struct passwd *, char *, char *, char *);
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void k5destroy(void);
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int k5_read_creds(char*);
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int k5_write_creds(void);
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#endif
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#if defined(KERBEROS) || defined(KERBEROS5)
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void dofork(void);
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#endif
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void decode_ss(const char *);
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void usage(void);
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#define TTYGRPNAME "tty" /* name of group to own ttys */
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#define DEFAULT_BACKOFF 3
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#define DEFAULT_RETRIES 10
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/*
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* This bounds the time given to login. Not a define so it can
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* be patched on machines where it's too small.
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*/
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u_int timeout = 300;
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#if defined(KERBEROS) || defined(KERBEROS5)
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int notickets = 1;
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char *instance;
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int has_ccache = 0;
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#endif
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#ifdef KERBEROS
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extern char *krbtkfile_env;
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extern int krb_configured;
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#endif
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#ifdef KERBEROS5
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extern krb5_context kcontext;
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extern int have_forward;
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extern char *krb5tkfile_env;
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extern int krb5_configured;
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#endif
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#if defined(KERBEROS) && defined(KERBEROS5)
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#define KERBEROS_CONFIGURED (krb_configured || krb5_configured)
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#elif defined(KERBEROS)
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#define KERBEROS_CONFIGURED krb_configured
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#elif defined(KERBEROS5)
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#define KERBEROS_CONFIGURED krb5_configured
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#endif
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struct passwd *pwd;
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int failures, have_ss;
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char term[64], *envinit[1], *hostname, *username, *tty, *nested;
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struct timeval now;
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struct sockaddr_storage ss;
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extern const char copyrightstr[];
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int
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main(int argc, char *argv[])
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{
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extern char **environ;
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struct group *gr;
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struct stat st;
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int ask, ch, cnt, fflag, hflag, pflag, sflag, quietlog, rootlogin, rval;
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int Fflag;
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uid_t uid, saved_uid;
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gid_t saved_gid, saved_gids[NGROUPS_MAX];
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int nsaved_gids;
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char *domain, *p, *ttyn, *pwprompt;
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const char *salt;
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char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10];
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char localhost[MAXHOSTNAMELEN + 1];
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int need_chpass, require_chpass;
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int login_retries = DEFAULT_RETRIES,
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login_backoff = DEFAULT_BACKOFF;
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time_t pw_warntime = _PASSWORD_WARNDAYS * SECSPERDAY;
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#ifdef KERBEROS5
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krb5_error_code kerror;
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#endif
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#if defined(KERBEROS) || defined(KERBEROS5)
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int got_tickets = 0;
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#endif
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#ifdef LOGIN_CAP
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char *shell = NULL;
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login_cap_t *lc = NULL;
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#endif
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tbuf[0] = '\0';
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rval = 0;
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pwprompt = NULL;
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nested = NULL;
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need_chpass = require_chpass = 0;
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(void)signal(SIGALRM, timedout);
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(void)alarm(timeout);
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(void)signal(SIGQUIT, SIG_IGN);
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(void)signal(SIGINT, SIG_IGN);
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(void)setpriority(PRIO_PROCESS, 0, 0);
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openlog("login", 0, LOG_AUTH);
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/*
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* -p is used by getty to tell login not to destroy the environment
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* -f is used to skip a second login authentication
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* -h is used by other servers to pass the name of the remote host to
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* login so that it may be placed in utmp/utmpx and wtmp/wtmpx
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* -a in addition to -h, a server may supply -a to pass the actual
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* server address.
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* -s is used to force use of S/Key or equivalent.
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*/
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domain = NULL;
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if (gethostname(localhost, sizeof(localhost)) < 0)
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syslog(LOG_ERR, "couldn't get local hostname: %m");
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else
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domain = strchr(localhost, '.');
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localhost[sizeof(localhost) - 1] = '\0';
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Fflag = fflag = hflag = pflag = sflag = 0;
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have_ss = 0;
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#ifdef KERBEROS5
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have_forward = 0;
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#endif
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uid = getuid();
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while ((ch = getopt(argc, argv, "a:Ffh:ps")) != -1)
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switch (ch) {
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case 'a':
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if (uid)
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errx(1, "-a option: %s", strerror(EPERM));
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decode_ss(optarg);
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#ifdef notdef
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(void)sockaddr_snprintf(optarg,
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sizeof(struct sockaddr_storage), "%a", (void *)&ss);
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#endif
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break;
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case 'F':
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Fflag = 1;
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/* FALLTHROUGH */
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case 'f':
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fflag = 1;
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break;
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case 'h':
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if (uid)
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errx(1, "-h option: %s", strerror(EPERM));
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hflag = 1;
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#ifdef notdef
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if (domain && (p = strchr(optarg, '.')) != NULL &&
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strcasecmp(p, domain) == 0)
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*p = '\0';
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#endif
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hostname = optarg;
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break;
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case 'p':
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pflag = 1;
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break;
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case 's':
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sflag = 1;
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break;
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default:
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case '?':
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usage();
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break;
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}
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setproctitle(NULL);
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argc -= optind;
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argv += optind;
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if (*argv) {
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username = *argv;
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ask = 0;
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} else
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ask = 1;
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#ifdef F_CLOSEM
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(void)fcntl(3, F_CLOSEM, 0);
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#else
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for (cnt = getdtablesize(); cnt > 2; cnt--)
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(void)close(cnt);
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#endif
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ttyn = ttyname(STDIN_FILENO);
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if (ttyn == NULL || *ttyn == '\0') {
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(void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY);
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ttyn = tname;
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}
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if ((tty = strstr(ttyn, "/pts/")) != NULL)
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++tty;
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else if ((tty = strrchr(ttyn, '/')) != NULL)
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++tty;
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else
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tty = ttyn;
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if (issetugid()) {
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nested = strdup(user_from_uid(getuid(), 0));
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if (nested == NULL) {
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syslog(LOG_ERR, "strdup: %m");
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sleepexit(1);
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}
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}
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#ifdef LOGIN_CAP
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/* Get "login-retries" and "login-backoff" from default class */
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if ((lc = login_getclass(NULL)) != NULL) {
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login_retries = (int)login_getcapnum(lc, "login-retries",
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DEFAULT_RETRIES, DEFAULT_RETRIES);
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login_backoff = (int)login_getcapnum(lc, "login-backoff",
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DEFAULT_BACKOFF, DEFAULT_BACKOFF);
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login_close(lc);
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lc = NULL;
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}
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#endif
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#ifdef KERBEROS5
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kerror = krb5_init_context(&kcontext);
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if (kerror) {
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/*
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* If Kerberos is not configured, that is, we are
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* not using Kerberos, do not log the error message.
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* However, if Kerberos is configured, and the
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* context init fails for some other reason, we need
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* to issue a no tickets warning to the user when the
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* login succeeds.
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*/
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if (kerror != ENXIO) { /* XXX NetBSD-local Heimdal hack */
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syslog(LOG_NOTICE,
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"%s when initializing Kerberos context",
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error_message(kerror));
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krb5_configured = 1;
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}
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login_krb5_get_tickets = 0;
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}
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#endif /* KERBEROS5 */
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for (cnt = 0;; ask = 1) {
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#if defined(KERBEROS)
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kdestroy();
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#endif
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#if defined(KERBEROS5)
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if (login_krb5_get_tickets)
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k5destroy();
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#endif
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if (ask) {
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fflag = 0;
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getloginname();
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}
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rootlogin = 0;
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#ifdef KERBEROS
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if ((instance = strchr(username, '.')) != NULL)
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*instance++ = '\0';
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else
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instance = "";
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#endif
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#ifdef KERBEROS5
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if ((instance = strchr(username, '/')) != NULL)
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*instance++ = '\0';
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else
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instance = "";
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#endif
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if (strlen(username) > MAXLOGNAME)
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username[MAXLOGNAME] = '\0';
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/*
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* Note if trying multiple user names; log failures for
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* previous user name, but don't bother logging one failure
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* for nonexistent name (mistyped username).
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*/
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if (failures && strcmp(tbuf, username)) {
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if (failures > (pwd ? 0 : 1))
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badlogin(tbuf);
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failures = 0;
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}
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(void)strlcpy(tbuf, username, sizeof(tbuf));
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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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#ifdef LOGIN_CAP
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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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lc = login_getclass(pwd ? pwd->pw_class : NULL);
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#endif
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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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* password, or the -f option was specified and the caller
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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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if (pwd) {
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if (pwd->pw_uid == 0)
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rootlogin = 1;
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if (fflag && (uid == 0 || uid == pwd->pw_uid)) {
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/* already authenticated */
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#ifdef KERBEROS5
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if (login_krb5_get_tickets && Fflag)
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k5_read_creds(username);
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#endif
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break;
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} else if (pwd->pw_passwd[0] == '\0') {
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/* pretend password okay */
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rval = 0;
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goto ttycheck;
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}
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}
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fflag = 0;
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(void)setpriority(PRIO_PROCESS, 0, -4);
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#ifdef SKEY
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if (skey_haskey(username) == 0) {
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static char skprompt[80];
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const char *skinfo = skey_keyinfo(username);
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(void)snprintf(skprompt, sizeof(skprompt),
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"Password [ %s ]:",
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skinfo ? skinfo : "error getting challenge");
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pwprompt = skprompt;
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} else
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#endif
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pwprompt = "Password:";
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p = getpass(pwprompt);
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if (pwd == NULL) {
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rval = 1;
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goto skip;
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}
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#ifdef KERBEROS
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if (
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#ifdef KERBEROS5
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/* allow a user to get both krb4 and krb5 tickets, if
|
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* desired. If krb5 is compiled in, the default action
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* is to ignore krb4 and get krb5 tickets, but the user
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* can override this in the krb5.conf. */
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login_krb4_get_tickets &&
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#endif
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klogin(pwd, instance, localhost, p) == 0) {
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rval = 0;
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got_tickets = 1;
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}
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#endif
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#ifdef KERBEROS5
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if (login_krb5_get_tickets &&
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k5login(pwd, instance, localhost, p) == 0) {
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rval = 0;
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got_tickets = 1;
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}
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#endif
|
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#if defined(KERBEROS) || defined(KERBEROS5)
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if (got_tickets)
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goto skip;
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#endif
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#ifdef SKEY
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if (skey_haskey(username) == 0 &&
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skey_passcheck(username, p) != -1) {
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rval = 0;
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goto skip;
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}
|
|
#endif
|
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if (!sflag && *pwd->pw_passwd != '\0' &&
|
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!strcmp(crypt(p, pwd->pw_passwd), pwd->pw_passwd)) {
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rval = 0;
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require_chpass = 1;
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goto skip;
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}
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rval = 1;
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skip:
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memset(p, 0, strlen(p));
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|
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(void)setpriority(PRIO_PROCESS, 0, 0);
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|
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ttycheck:
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/*
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|
* If trying to log in as root without Kerberos,
|
|
* but with insecure terminal, refuse the login attempt.
|
|
*/
|
|
if (pwd && !rval && rootlogin && !rootterm(tty)) {
|
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(void)printf("Login incorrect or refused on this "
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|
"terminal.\n");
|
|
if (hostname)
|
|
syslog(LOG_NOTICE,
|
|
"LOGIN %s REFUSED FROM %s ON TTY %s",
|
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pwd->pw_name, hostname, tty);
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|
else
|
|
syslog(LOG_NOTICE,
|
|
"LOGIN %s REFUSED ON TTY %s",
|
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pwd->pw_name, tty);
|
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continue;
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}
|
|
|
|
if (pwd && !rval)
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break;
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|
|
|
(void)printf("Login incorrect or refused on this "
|
|
"terminal.\n");
|
|
failures++;
|
|
cnt++;
|
|
/*
|
|
* We allow login_retries tries, but after login_backoff
|
|
* we start backing off. These default to 10 and 3
|
|
* respectively.
|
|
*/
|
|
if (cnt > login_backoff) {
|
|
if (cnt >= login_retries) {
|
|
badlogin(username);
|
|
sleepexit(1);
|
|
}
|
|
sleep((u_int)((cnt - login_backoff) * 5));
|
|
}
|
|
}
|
|
|
|
/* committed to login -- turn off timeout */
|
|
(void)alarm((u_int)0);
|
|
|
|
endpwent();
|
|
|
|
/* if user not super-user, check for disabled logins */
|
|
#ifdef LOGIN_CAP
|
|
if (!login_getcapbool(lc, "ignorenologin", rootlogin))
|
|
checknologin(login_getcapstr(lc, "nologin", NULL, NULL));
|
|
#else
|
|
if (!rootlogin)
|
|
checknologin(NULL);
|
|
#endif
|
|
|
|
#ifdef LOGIN_CAP
|
|
quietlog = login_getcapbool(lc, "hushlogin", 0);
|
|
#else
|
|
quietlog = 0;
|
|
#endif
|
|
/* Temporarily give up special privileges so we can change */
|
|
/* into NFS-mounted homes that are exported for non-root */
|
|
/* access and have mode 7x0 */
|
|
saved_uid = geteuid();
|
|
saved_gid = getegid();
|
|
nsaved_gids = getgroups(NGROUPS_MAX, saved_gids);
|
|
|
|
(void)setegid(pwd->pw_gid);
|
|
initgroups(username, pwd->pw_gid);
|
|
(void)seteuid(pwd->pw_uid);
|
|
|
|
if (chdir(pwd->pw_dir) < 0) {
|
|
#ifdef LOGIN_CAP
|
|
if (login_getcapbool(lc, "requirehome", 0)) {
|
|
(void)printf("Home directory %s required\n",
|
|
pwd->pw_dir);
|
|
sleepexit(1);
|
|
}
|
|
#endif
|
|
(void)printf("No home directory %s!\n", pwd->pw_dir);
|
|
if (chdir("/"))
|
|
exit(0);
|
|
pwd->pw_dir = "/";
|
|
(void)printf("Logging in with home = \"/\".\n");
|
|
}
|
|
|
|
if (!quietlog)
|
|
quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0;
|
|
|
|
/* regain special privileges */
|
|
(void)seteuid(saved_uid);
|
|
setgroups(nsaved_gids, saved_gids);
|
|
(void)setegid(saved_gid);
|
|
|
|
#ifdef LOGIN_CAP
|
|
pw_warntime = login_getcaptime(lc, "password-warn",
|
|
_PASSWORD_WARNDAYS * SECSPERDAY,
|
|
_PASSWORD_WARNDAYS * SECSPERDAY);
|
|
#endif
|
|
|
|
(void)gettimeofday(&now, (struct timezone *)NULL);
|
|
if (pwd->pw_expire) {
|
|
if (now.tv_sec >= pwd->pw_expire) {
|
|
(void)printf("Sorry -- your account has expired.\n");
|
|
sleepexit(1);
|
|
} else if (pwd->pw_expire - now.tv_sec < pw_warntime &&
|
|
!quietlog)
|
|
(void)printf("Warning: your account expires on %s",
|
|
ctime(&pwd->pw_expire));
|
|
}
|
|
if (pwd->pw_change) {
|
|
if (pwd->pw_change == _PASSWORD_CHGNOW)
|
|
need_chpass = 1;
|
|
else if (now.tv_sec >= pwd->pw_change) {
|
|
(void)printf("Sorry -- your password has expired.\n");
|
|
sleepexit(1);
|
|
} else if (pwd->pw_change - now.tv_sec < pw_warntime &&
|
|
!quietlog)
|
|
(void)printf("Warning: your password expires on %s",
|
|
ctime(&pwd->pw_change));
|
|
|
|
}
|
|
/* Nothing else left to fail -- really log in. */
|
|
update_db(quietlog);
|
|
|
|
(void)chown(ttyn, pwd->pw_uid,
|
|
(gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid);
|
|
|
|
if (ttyaction(ttyn, "login", pwd->pw_name))
|
|
(void)printf("Warning: ttyaction failed.\n");
|
|
|
|
#if defined(KERBEROS) || defined(KERBEROS5)
|
|
/* Fork so that we can call kdestroy */
|
|
if (
|
|
#ifdef KERBEROS5
|
|
! login_krb5_retain_ccache &&
|
|
#endif
|
|
has_ccache)
|
|
dofork();
|
|
#endif
|
|
|
|
/* Destroy environment unless user has requested its preservation. */
|
|
if (!pflag)
|
|
environ = envinit;
|
|
|
|
#ifdef LOGIN_CAP
|
|
if (nested == NULL && setusercontext(lc, pwd, pwd->pw_uid,
|
|
LOGIN_SETLOGIN) != 0) {
|
|
syslog(LOG_ERR, "setusercontext failed");
|
|
exit(1);
|
|
}
|
|
if (setusercontext(lc, pwd, pwd->pw_uid,
|
|
(LOGIN_SETALL & ~(LOGIN_SETPATH|LOGIN_SETLOGIN))) != 0) {
|
|
syslog(LOG_ERR, "setusercontext failed");
|
|
exit(1);
|
|
}
|
|
#else
|
|
(void)setgid(pwd->pw_gid);
|
|
|
|
initgroups(username, pwd->pw_gid);
|
|
|
|
if (nested == NULL && setlogin(pwd->pw_name) < 0)
|
|
syslog(LOG_ERR, "setlogin() failure: %m");
|
|
|
|
/* Discard permissions last so can't get killed and drop core. */
|
|
if (rootlogin)
|
|
(void)setuid(0);
|
|
else
|
|
(void)setuid(pwd->pw_uid);
|
|
#endif
|
|
|
|
if (*pwd->pw_shell == '\0')
|
|
pwd->pw_shell = _PATH_BSHELL;
|
|
#ifdef LOGIN_CAP
|
|
if ((shell = login_getcapstr(lc, "shell", NULL, NULL)) != NULL) {
|
|
if ((shell = strdup(shell)) == NULL) {
|
|
syslog(LOG_ERR, "Cannot alloc mem");
|
|
sleepexit(1);
|
|
}
|
|
pwd->pw_shell = shell;
|
|
}
|
|
#endif
|
|
|
|
(void)setenv("HOME", pwd->pw_dir, 1);
|
|
(void)setenv("SHELL", pwd->pw_shell, 1);
|
|
if (term[0] == '\0') {
|
|
char *tt = (char *)stypeof(tty);
|
|
#ifdef LOGIN_CAP
|
|
if (tt == NULL)
|
|
tt = login_getcapstr(lc, "term", NULL, NULL);
|
|
#endif
|
|
/* unknown term -> "su" */
|
|
(void)strlcpy(term, tt != NULL ? tt : "su", sizeof(term));
|
|
}
|
|
(void)setenv("TERM", term, 0);
|
|
(void)setenv("LOGNAME", pwd->pw_name, 1);
|
|
(void)setenv("USER", pwd->pw_name, 1);
|
|
|
|
#ifdef LOGIN_CAP
|
|
setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETPATH);
|
|
#else
|
|
(void)setenv("PATH", _PATH_DEFPATH, 0);
|
|
#endif
|
|
|
|
#ifdef KERBEROS
|
|
if (krbtkfile_env)
|
|
(void)setenv("KRBTKFILE", krbtkfile_env, 1);
|
|
#endif
|
|
#ifdef KERBEROS5
|
|
if (krb5tkfile_env)
|
|
(void)setenv("KRB5CCNAME", krb5tkfile_env, 1);
|
|
#endif
|
|
|
|
if (tty[sizeof("tty")-1] == 'd')
|
|
syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name);
|
|
|
|
/* If fflag is on, assume caller/authenticator has logged root login. */
|
|
if (rootlogin && fflag == 0) {
|
|
if (hostname)
|
|
syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s",
|
|
username, tty, hostname);
|
|
else
|
|
syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s",
|
|
username, tty);
|
|
}
|
|
|
|
#if defined(KERBEROS) || defined(KERBEROS5)
|
|
if (KERBEROS_CONFIGURED && !quietlog && notickets == 1)
|
|
(void)printf("Warning: no Kerberos tickets issued.\n");
|
|
#endif
|
|
|
|
if (!quietlog) {
|
|
char *fname;
|
|
#ifdef LOGIN_CAP
|
|
fname = login_getcapstr(lc, "copyright", NULL, NULL);
|
|
if (fname != NULL && access(fname, F_OK) == 0)
|
|
motd(fname);
|
|
else
|
|
#endif
|
|
(void)printf("%s", copyrightstr);
|
|
|
|
#ifdef LOGIN_CAP
|
|
fname = login_getcapstr(lc, "welcome", NULL, NULL);
|
|
if (fname == NULL || access(fname, F_OK) != 0)
|
|
#endif
|
|
fname = _PATH_MOTDFILE;
|
|
motd(fname);
|
|
|
|
(void)snprintf(tbuf,
|
|
sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pwd->pw_name);
|
|
if (stat(tbuf, &st) == 0 && st.st_size != 0)
|
|
(void)printf("You have %smail.\n",
|
|
(st.st_mtime > st.st_atime) ? "new " : "");
|
|
}
|
|
|
|
#ifdef LOGIN_CAP
|
|
login_close(lc);
|
|
#endif
|
|
|
|
(void)signal(SIGALRM, SIG_DFL);
|
|
(void)signal(SIGQUIT, SIG_DFL);
|
|
(void)signal(SIGINT, SIG_DFL);
|
|
(void)signal(SIGTSTP, SIG_IGN);
|
|
|
|
tbuf[0] = '-';
|
|
(void)strlcpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ?
|
|
p + 1 : pwd->pw_shell, sizeof(tbuf) - 1);
|
|
|
|
/* Wait to change password until we're unprivileged */
|
|
if (need_chpass) {
|
|
if (!require_chpass)
|
|
(void)printf(
|
|
"Warning: your password has expired. Please change it as soon as possible.\n");
|
|
else {
|
|
int status;
|
|
|
|
(void)printf(
|
|
"Your password has expired. Please choose a new one.\n");
|
|
switch (fork()) {
|
|
case -1:
|
|
warn("fork");
|
|
sleepexit(1);
|
|
case 0:
|
|
execl(_PATH_BINPASSWD, "passwd", 0);
|
|
_exit(1);
|
|
default:
|
|
if (wait(&status) == -1 ||
|
|
WEXITSTATUS(status))
|
|
sleepexit(1);
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef KERBEROS5
|
|
if (login_krb5_get_tickets)
|
|
k5_write_creds();
|
|
#endif
|
|
execlp(pwd->pw_shell, tbuf, 0);
|
|
err(1, "%s", pwd->pw_shell);
|
|
}
|
|
|
|
#if defined(KERBEROS) || defined(KERBEROS5)
|
|
#define NBUFSIZ (MAXLOGNAME + 1 + 5) /* .root suffix */
|
|
#else
|
|
#define NBUFSIZ (MAXLOGNAME + 1)
|
|
#endif
|
|
|
|
#if defined(KERBEROS) || defined(KERBEROS5)
|
|
/*
|
|
* This routine handles cleanup stuff, and the like.
|
|
* It exists only in the child process.
|
|
*/
|
|
#include <sys/wait.h>
|
|
void
|
|
dofork(void)
|
|
{
|
|
int child;
|
|
|
|
if (!(child = fork()))
|
|
return; /* Child process */
|
|
|
|
/*
|
|
* Setup stuff? This would be things we could do in parallel
|
|
* with login
|
|
*/
|
|
(void)chdir("/"); /* Let's not keep the fs busy... */
|
|
|
|
/* If we're the parent, watch the child until it dies */
|
|
while (wait(0) != child)
|
|
;
|
|
|
|
/* Cleanup stuff */
|
|
/* Run kdestroy to destroy tickets */
|
|
#ifdef KERBEROS
|
|
kdestroy();
|
|
#endif
|
|
#ifdef KERBEROS5
|
|
if (login_krb5_get_tickets)
|
|
k5destroy();
|
|
#endif
|
|
|
|
/* Leave */
|
|
exit(0);
|
|
}
|
|
#endif
|
|
|
|
void
|
|
getloginname(void)
|
|
{
|
|
int ch;
|
|
char *p;
|
|
static char nbuf[NBUFSIZ];
|
|
|
|
for (;;) {
|
|
(void)printf("login: ");
|
|
for (p = nbuf; (ch = getchar()) != '\n'; ) {
|
|
if (ch == EOF) {
|
|
badlogin(username);
|
|
exit(0);
|
|
}
|
|
if (p < nbuf + (NBUFSIZ - 1))
|
|
*p++ = ch;
|
|
}
|
|
if (p > nbuf) {
|
|
if (nbuf[0] == '-')
|
|
(void)fprintf(stderr,
|
|
"login names may not start with '-'.\n");
|
|
else {
|
|
*p = '\0';
|
|
username = nbuf;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
int
|
|
rootterm(char *ttyn)
|
|
{
|
|
struct ttyent *t;
|
|
|
|
return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE);
|
|
}
|
|
|
|
jmp_buf motdinterrupt;
|
|
|
|
void
|
|
motd(char *fname)
|
|
{
|
|
int fd, nchars;
|
|
sig_t oldint;
|
|
char tbuf[8192];
|
|
|
|
if ((fd = open(fname ? fname : _PATH_MOTDFILE, O_RDONLY, 0)) < 0)
|
|
return;
|
|
oldint = signal(SIGINT, sigint);
|
|
if (setjmp(motdinterrupt) == 0)
|
|
while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0)
|
|
(void)write(fileno(stdout), tbuf, nchars);
|
|
(void)signal(SIGINT, oldint);
|
|
(void)close(fd);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
sigint(int signo)
|
|
{
|
|
|
|
longjmp(motdinterrupt, 1);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
timedout(int signo)
|
|
{
|
|
|
|
(void)fprintf(stderr, "Login timed out after %d seconds\n", timeout);
|
|
exit(0);
|
|
}
|
|
|
|
void
|
|
checknologin(char *fname)
|
|
{
|
|
int fd, nchars;
|
|
char tbuf[8192];
|
|
|
|
if ((fd = open(fname ? fname : _PATH_NOLOGIN, O_RDONLY, 0)) >= 0) {
|
|
while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0)
|
|
(void)write(fileno(stdout), tbuf, nchars);
|
|
sleepexit(0);
|
|
}
|
|
}
|
|
|
|
static void
|
|
update_db(int quietlog)
|
|
{
|
|
if (nested != NULL) {
|
|
if (hostname != NULL)
|
|
syslog(LOG_NOTICE, "%s to %s on tty %s from %s",
|
|
nested, pwd->pw_name, tty, hostname);
|
|
else
|
|
syslog(LOG_NOTICE, "%s to %s on tty %s", nested,
|
|
pwd->pw_name, tty);
|
|
|
|
return;
|
|
}
|
|
if (hostname != NULL && have_ss == 0) {
|
|
socklen_t len = sizeof(ss);
|
|
have_ss = getpeername(STDIN_FILENO, (struct sockaddr *)&ss,
|
|
&len) != -1;
|
|
}
|
|
(void)gettimeofday(&now, NULL);
|
|
#ifdef SUPPORT_UTMPX
|
|
doutmpx();
|
|
dolastlogx(quietlog);
|
|
quietlog = 1;
|
|
#endif
|
|
#ifdef SUPPORT_UTMP
|
|
doutmp();
|
|
dolastlog(quietlog);
|
|
#endif
|
|
}
|
|
|
|
#ifdef SUPPORT_UTMPX
|
|
static void
|
|
doutmpx(void)
|
|
{
|
|
struct utmpx utmpx;
|
|
char *t;
|
|
|
|
memset((void *)&utmpx, 0, sizeof(utmpx));
|
|
utmpx.ut_tv = now;
|
|
(void)strncpy(utmpx.ut_name, username, sizeof(utmpx.ut_name));
|
|
if (hostname) {
|
|
(void)strncpy(utmpx.ut_host, hostname, sizeof(utmpx.ut_host));
|
|
utmpx.ut_ss = ss;
|
|
}
|
|
(void)strncpy(utmpx.ut_line, tty, sizeof(utmpx.ut_line));
|
|
utmpx.ut_type = USER_PROCESS;
|
|
utmpx.ut_pid = getpid();
|
|
t = tty + strlen(tty);
|
|
if (t - tty >= sizeof(utmpx.ut_id)) {
|
|
(void)strncpy(utmpx.ut_id, t - sizeof(utmpx.ut_id),
|
|
sizeof(utmpx.ut_id));
|
|
} else {
|
|
(void)strncpy(utmpx.ut_id, tty, sizeof(utmpx.ut_id));
|
|
}
|
|
if (pututxline(&utmpx) == NULL)
|
|
syslog(LOG_NOTICE, "Cannot update utmpx: %m");
|
|
endutxent();
|
|
if (updwtmpx(_PATH_WTMPX, &utmpx) != 0)
|
|
syslog(LOG_NOTICE, "Cannot update wtmpx: %m");
|
|
}
|
|
|
|
static void
|
|
dolastlogx(int quiet)
|
|
{
|
|
struct lastlogx ll;
|
|
if (!quiet && getlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != NULL) {
|
|
time_t t = (time_t)ll.ll_tv.tv_sec;
|
|
(void)printf("Last login: %.24s ", ctime(&t));
|
|
if (*ll.ll_host != '\0')
|
|
(void)printf("from %.*s ",
|
|
(int)sizeof(ll.ll_host),
|
|
ll.ll_host);
|
|
(void)printf("on %.*s\n",
|
|
(int)sizeof(ll.ll_line),
|
|
ll.ll_line);
|
|
}
|
|
ll.ll_tv = now;
|
|
(void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
|
|
if (hostname)
|
|
(void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host));
|
|
else
|
|
(void)memset(ll.ll_host, '\0', sizeof(ll.ll_host));
|
|
if (have_ss)
|
|
ll.ll_ss = ss;
|
|
else
|
|
(void)memset(&ll.ll_ss, 0, sizeof(ll.ll_ss));
|
|
if (updlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != 0)
|
|
syslog(LOG_NOTICE, "Cannot update lastlogx: %m");
|
|
}
|
|
#endif
|
|
|
|
#ifdef SUPPORT_UTMP
|
|
static void
|
|
doutmp(void)
|
|
{
|
|
struct utmp utmp;
|
|
|
|
(void)memset((void *)&utmp, 0, sizeof(utmp));
|
|
utmp.ut_time = now.tv_sec;
|
|
(void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name));
|
|
if (hostname)
|
|
(void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host));
|
|
(void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line));
|
|
login(&utmp);
|
|
}
|
|
|
|
static void
|
|
dolastlog(int quiet)
|
|
{
|
|
struct lastlog ll;
|
|
int fd;
|
|
|
|
if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) {
|
|
(void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), SEEK_SET);
|
|
if (!quiet) {
|
|
if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) &&
|
|
ll.ll_time != 0) {
|
|
(void)printf("Last login: %.24s ",
|
|
ctime(&ll.ll_time));
|
|
if (*ll.ll_host != '\0')
|
|
(void)printf("from %.*s ",
|
|
(int)sizeof(ll.ll_host),
|
|
ll.ll_host);
|
|
(void)printf("on %.*s\n",
|
|
(int)sizeof(ll.ll_line), ll.ll_line);
|
|
}
|
|
(void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)),
|
|
SEEK_SET);
|
|
}
|
|
memset((void *)&ll, 0, sizeof(ll));
|
|
ll.ll_time = now.tv_sec;
|
|
(void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
|
|
if (hostname)
|
|
(void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host));
|
|
(void)write(fd, (char *)&ll, sizeof(ll));
|
|
(void)close(fd);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
void
|
|
badlogin(char *name)
|
|
{
|
|
|
|
if (failures == 0)
|
|
return;
|
|
if (hostname) {
|
|
syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s",
|
|
failures, failures > 1 ? "S" : "", hostname);
|
|
syslog(LOG_AUTHPRIV|LOG_NOTICE,
|
|
"%d LOGIN FAILURE%s FROM %s, %s",
|
|
failures, failures > 1 ? "S" : "", hostname, name);
|
|
} else {
|
|
syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s",
|
|
failures, failures > 1 ? "S" : "", tty);
|
|
syslog(LOG_AUTHPRIV|LOG_NOTICE,
|
|
"%d LOGIN FAILURE%s ON %s, %s",
|
|
failures, failures > 1 ? "S" : "", tty, name);
|
|
}
|
|
}
|
|
|
|
const char *
|
|
stypeof(const char *ttyid)
|
|
{
|
|
struct ttyent *t;
|
|
|
|
return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : NULL);
|
|
}
|
|
|
|
void
|
|
sleepexit(int eval)
|
|
{
|
|
|
|
(void)sleep(5);
|
|
exit(eval);
|
|
}
|
|
|
|
void
|
|
decode_ss(const char *arg)
|
|
{
|
|
struct sockaddr_storage *ssp;
|
|
size_t len = strlen(arg);
|
|
|
|
if (len > sizeof(*ssp) * 4 + 1 || len < sizeof(*ssp))
|
|
errx(1, "Bad argument");
|
|
|
|
if ((ssp = malloc(len)) == NULL)
|
|
err(1, NULL);
|
|
|
|
if (strunvis((char *)ssp, arg) != sizeof(*ssp))
|
|
errx(1, "Decoding error");
|
|
|
|
(void)memcpy(&ss, ssp, sizeof(ss));
|
|
have_ss = 1;
|
|
}
|
|
|
|
void
|
|
usage(void)
|
|
{
|
|
(void)fprintf(stderr,
|
|
"Usage: %s [-Ffps] [-a address] [-h hostname] [username]\n",
|
|
getprogname());
|
|
exit(1);
|
|
}
|