977 lines
23 KiB
C
977 lines
23 KiB
C
/* $NetBSD: login.c,v 1.64 2001/01/16 02:50:29 cgd Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#ifndef lint
|
|
__COPYRIGHT(
|
|
"@(#) Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994\n\
|
|
The Regents of the University of California. All rights reserved.\n");
|
|
#endif /* not lint */
|
|
|
|
#ifndef lint
|
|
#if 0
|
|
static char sccsid[] = "@(#)login.c 8.4 (Berkeley) 4/2/94";
|
|
#endif
|
|
__RCSID("$NetBSD: login.c,v 1.64 2001/01/16 02:50:29 cgd Exp $");
|
|
#endif /* not lint */
|
|
|
|
/*
|
|
* login [ name ]
|
|
* login -h hostname (for telnetd, etc.)
|
|
* login -f name (for pre-authenticated login: datakit, xterm, etc.)
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/time.h>
|
|
#include <sys/resource.h>
|
|
#include <sys/file.h>
|
|
#include <sys/wait.h>
|
|
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <grp.h>
|
|
#include <pwd.h>
|
|
#include <setjmp.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <syslog.h>
|
|
#include <time.h>
|
|
#include <ttyent.h>
|
|
#include <tzfile.h>
|
|
#include <unistd.h>
|
|
#include <utmp.h>
|
|
#include <util.h>
|
|
#ifdef SKEY
|
|
#include <skey.h>
|
|
#endif
|
|
#ifdef KERBEROS5
|
|
#include <krb5/krb5.h>
|
|
#include <com_err.h>
|
|
#endif
|
|
#ifdef LOGIN_CAP
|
|
#include <login_cap.h>
|
|
#endif
|
|
|
|
#include "pathnames.h"
|
|
|
|
#ifdef KERBEROS5
|
|
int login_krb5_get_tickets = 1;
|
|
int login_krb4_get_tickets = 0;
|
|
int login_krb5_forwardable_tgt = 0;
|
|
int login_krb5_retain_ccache = 0;
|
|
#endif
|
|
|
|
void badlogin __P((char *));
|
|
void checknologin __P((char *));
|
|
void dolastlog __P((int));
|
|
void getloginname __P((void));
|
|
int main __P((int, char *[]));
|
|
void motd __P((char *));
|
|
int rootterm __P((char *));
|
|
void sigint __P((int));
|
|
void sleepexit __P((int));
|
|
const char *stypeof __P((const char *));
|
|
void timedout __P((int));
|
|
#if defined(KERBEROS)
|
|
int klogin __P((struct passwd *, char *, char *, char *));
|
|
void kdestroy __P((void));
|
|
#endif
|
|
#ifdef KERBEROS5
|
|
int k5login __P((struct passwd *, char *, char *, char *));
|
|
void k5destroy __P((void));
|
|
int k5_read_creds __P((char*));
|
|
int k5_write_creds __P((void));
|
|
#endif
|
|
#if defined(KERBEROS) || defined(KERBEROS5)
|
|
void dofork __P((void));
|
|
#endif
|
|
|
|
#define TTYGRPNAME "tty" /* name of group to own ttys */
|
|
|
|
#define DEFAULT_BACKOFF 3
|
|
#define DEFAULT_RETRIES 10
|
|
|
|
/*
|
|
* This bounds the time given to login. Not a define so it can
|
|
* be patched on machines where it's too small.
|
|
*/
|
|
u_int timeout = 300;
|
|
|
|
#if defined(KERBEROS) || defined(KERBEROS5)
|
|
int notickets = 1;
|
|
char *instance;
|
|
int has_ccache = 0;
|
|
#endif
|
|
#ifdef KERBEROS
|
|
extern char *krbtkfile_env;
|
|
extern int krb_configured;
|
|
#endif
|
|
#ifdef KERBEROS5
|
|
extern krb5_context kcontext;
|
|
extern int have_forward;
|
|
extern char *krb5tkfile_env;
|
|
extern int krb5_configured;
|
|
#endif
|
|
|
|
#if defined(KERBEROS) && defined(KERBEROS5)
|
|
#define KERBEROS_CONFIGURED (krb_configured || krb5_configured)
|
|
#elif defined(KERBEROS)
|
|
#define KERBEROS_CONFIGURED krb_configured
|
|
#elif defined(KERBEROS5)
|
|
#define KERBEROS_CONFIGURED krb5_configured
|
|
#endif
|
|
|
|
struct passwd *pwd;
|
|
int failures;
|
|
char term[64], *envinit[1], *hostname, *username, *tty;
|
|
|
|
static const char copyrightstr[] = "\
|
|
Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001\n\
|
|
\tThe NetBSD Foundation, Inc. All rights reserved.\n\
|
|
Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994\n\
|
|
\tThe Regents of the University of California. All rights reserved.\n\n";
|
|
|
|
int
|
|
main(argc, argv)
|
|
int argc;
|
|
char *argv[];
|
|
{
|
|
extern char **environ;
|
|
struct group *gr;
|
|
struct stat st;
|
|
struct timeval tp;
|
|
struct utmp utmp;
|
|
int ask, ch, cnt, fflag, hflag, pflag, sflag, quietlog, rootlogin, rval;
|
|
int Fflag;
|
|
uid_t uid, saved_uid;
|
|
gid_t saved_gid, saved_gids[NGROUPS_MAX];
|
|
int nsaved_gids;
|
|
char *domain, *p, *ttyn, *pwprompt;
|
|
const char *salt;
|
|
char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10];
|
|
char localhost[MAXHOSTNAMELEN + 1];
|
|
int need_chpass, require_chpass;
|
|
int login_retries = DEFAULT_RETRIES,
|
|
login_backoff = DEFAULT_BACKOFF;
|
|
time_t pw_warntime = _PASSWORD_WARNDAYS * SECSPERDAY;
|
|
#ifdef KERBEROS5
|
|
krb5_error_code kerror;
|
|
#endif
|
|
#if defined(KERBEROS) || defined(KERBEROS5)
|
|
int got_tickets = 0;
|
|
#endif
|
|
#ifdef LOGIN_CAP
|
|
char *shell = NULL;
|
|
login_cap_t *lc = NULL;
|
|
#endif
|
|
|
|
tbuf[0] = '\0';
|
|
rval = 0;
|
|
pwprompt = NULL;
|
|
need_chpass = require_chpass = 0;
|
|
|
|
(void)signal(SIGALRM, timedout);
|
|
(void)alarm(timeout);
|
|
(void)signal(SIGQUIT, SIG_IGN);
|
|
(void)signal(SIGINT, SIG_IGN);
|
|
(void)setpriority(PRIO_PROCESS, 0, 0);
|
|
|
|
openlog("login", 0, LOG_AUTH);
|
|
|
|
/*
|
|
* -p is used by getty to tell login not to destroy the environment
|
|
* -f is used to skip a second login authentication
|
|
* -h is used by other servers to pass the name of the remote
|
|
* host to login so that it may be placed in utmp and wtmp
|
|
* -s is used to force use of S/Key or equivalent.
|
|
*/
|
|
domain = NULL;
|
|
if (gethostname(localhost, sizeof(localhost)) < 0)
|
|
syslog(LOG_ERR, "couldn't get local hostname: %m");
|
|
else
|
|
domain = strchr(localhost, '.');
|
|
localhost[sizeof(localhost) - 1] = '\0';
|
|
|
|
Fflag = fflag = hflag = pflag = sflag = 0;
|
|
#ifdef KERBEROS5
|
|
have_forward = 0;
|
|
#endif
|
|
uid = getuid();
|
|
while ((ch = getopt(argc, argv, "Ffh:ps")) != -1)
|
|
switch (ch) {
|
|
case 'F':
|
|
Fflag = 1;
|
|
/* FALLTHROUGH */
|
|
case 'f':
|
|
fflag = 1;
|
|
break;
|
|
case 'h':
|
|
if (uid)
|
|
errx(1, "-h option: %s", strerror(EPERM));
|
|
hflag = 1;
|
|
if (domain && (p = strchr(optarg, '.')) != NULL &&
|
|
strcasecmp(p, domain) == 0)
|
|
*p = 0;
|
|
hostname = optarg;
|
|
break;
|
|
case 'p':
|
|
pflag = 1;
|
|
break;
|
|
case 's':
|
|
sflag = 1;
|
|
break;
|
|
default:
|
|
case '?':
|
|
(void)fprintf(stderr,
|
|
"usage: login [-fps] [-h hostname] [username]\n");
|
|
exit(1);
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
if (*argv) {
|
|
username = *argv;
|
|
ask = 0;
|
|
} else
|
|
ask = 1;
|
|
|
|
for (cnt = getdtablesize(); cnt > 2; cnt--)
|
|
(void)close(cnt);
|
|
|
|
ttyn = ttyname(STDIN_FILENO);
|
|
if (ttyn == NULL || *ttyn == '\0') {
|
|
(void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY);
|
|
ttyn = tname;
|
|
}
|
|
if ((tty = strrchr(ttyn, '/')) != NULL)
|
|
++tty;
|
|
else
|
|
tty = ttyn;
|
|
|
|
#ifdef LOGIN_CAP
|
|
/* Get "login-retries" and "login-backoff" from default class */
|
|
if ((lc = login_getclass(NULL)) != NULL) {
|
|
login_retries = (int)login_getcapnum(lc, "login-retries",
|
|
DEFAULT_RETRIES, DEFAULT_RETRIES);
|
|
login_backoff = (int)login_getcapnum(lc, "login-backoff",
|
|
DEFAULT_BACKOFF, DEFAULT_BACKOFF);
|
|
login_close(lc);
|
|
lc = NULL;
|
|
}
|
|
#endif
|
|
|
|
#ifdef KERBEROS5
|
|
kerror = krb5_init_context(&kcontext);
|
|
if (kerror) {
|
|
/*
|
|
* If Kerberos is not configured, that is, we are
|
|
* not using Kerberos, do not log the error message.
|
|
* However, if Kerberos is configured, and the
|
|
* context init fails for some other reason, we need
|
|
* to issue a no tickets warning to the user when the
|
|
* login succeeds.
|
|
*/
|
|
if (kerror != ENXIO) { /* XXX NetBSD-local Heimdal hack */
|
|
syslog(LOG_NOTICE,
|
|
"%s when initializing Kerberos context",
|
|
error_message(kerror));
|
|
krb5_configured = 1;
|
|
}
|
|
login_krb5_get_tickets = 0;
|
|
}
|
|
#endif /* KERBEROS5 */
|
|
|
|
for (cnt = 0;; ask = 1) {
|
|
#if defined(KERBEROS)
|
|
kdestroy();
|
|
#endif
|
|
#if defined(KERBEROS5)
|
|
if (login_krb5_get_tickets)
|
|
k5destroy();
|
|
#endif
|
|
if (ask) {
|
|
fflag = 0;
|
|
getloginname();
|
|
}
|
|
rootlogin = 0;
|
|
#ifdef KERBEROS
|
|
if ((instance = strchr(username, '.')) != NULL)
|
|
*instance++ = '\0';
|
|
else
|
|
instance = "";
|
|
#endif
|
|
#ifdef KERBEROS5
|
|
if ((instance = strchr(username, '/')) != NULL)
|
|
*instance++ = '\0';
|
|
else
|
|
instance = "";
|
|
#endif
|
|
if (strlen(username) > MAXLOGNAME)
|
|
username[MAXLOGNAME] = '\0';
|
|
|
|
/*
|
|
* Note if trying multiple user names; log failures for
|
|
* previous user name, but don't bother logging one failure
|
|
* for nonexistent name (mistyped username).
|
|
*/
|
|
if (failures && strcmp(tbuf, username)) {
|
|
if (failures > (pwd ? 0 : 1))
|
|
badlogin(tbuf);
|
|
failures = 0;
|
|
}
|
|
(void)strncpy(tbuf, username, sizeof(tbuf) - 1);
|
|
tbuf[sizeof(tbuf) - 1] = '\0';
|
|
|
|
if ((pwd = getpwnam(username)) != NULL)
|
|
salt = pwd->pw_passwd;
|
|
else
|
|
salt = "xx";
|
|
|
|
#ifdef LOGIN_CAP
|
|
/*
|
|
* Establish the class now, before we might goto
|
|
* within the next block. pwd can be NULL since it
|
|
* falls back to the "default" class if it is.
|
|
*/
|
|
lc = login_getclass(pwd ? pwd->pw_class : NULL);
|
|
#endif
|
|
/*
|
|
* if we have a valid account name, and it doesn't have a
|
|
* password, or the -f option was specified and the caller
|
|
* is root or the caller isn't changing their uid, don't
|
|
* authenticate.
|
|
*/
|
|
if (pwd) {
|
|
if (pwd->pw_uid == 0)
|
|
rootlogin = 1;
|
|
|
|
if (fflag && (uid == 0 || uid == pwd->pw_uid)) {
|
|
/* already authenticated */
|
|
#ifdef KERBEROS5
|
|
if (login_krb5_get_tickets && Fflag)
|
|
k5_read_creds(username);
|
|
#endif
|
|
break;
|
|
} else if (pwd->pw_passwd[0] == '\0') {
|
|
/* pretend password okay */
|
|
rval = 0;
|
|
goto ttycheck;
|
|
}
|
|
}
|
|
|
|
fflag = 0;
|
|
|
|
(void)setpriority(PRIO_PROCESS, 0, -4);
|
|
|
|
#ifdef SKEY
|
|
if (skey_haskey(username) == 0) {
|
|
static char skprompt[80];
|
|
const char *skinfo = skey_keyinfo(username);
|
|
|
|
(void)snprintf(skprompt, sizeof(skprompt)-1,
|
|
"Password [%s]:",
|
|
skinfo ? skinfo : "error getting challenge");
|
|
pwprompt = skprompt;
|
|
} else
|
|
#endif
|
|
pwprompt = "Password:";
|
|
|
|
p = getpass(pwprompt);
|
|
|
|
if (pwd == NULL) {
|
|
rval = 1;
|
|
goto skip;
|
|
}
|
|
#ifdef KERBEROS
|
|
if (
|
|
#ifdef KERBEROS5
|
|
/* allow a user to get both krb4 and krb5 tickets, if
|
|
* desired. If krb5 is compiled in, the default action
|
|
* is to ignore krb4 and get krb5 tickets, but the user
|
|
* can override this in the krb5.conf. */
|
|
login_krb4_get_tickets &&
|
|
#endif
|
|
klogin(pwd, instance, localhost, p) == 0) {
|
|
rval = 0;
|
|
got_tickets = 1;
|
|
}
|
|
#endif
|
|
#ifdef KERBEROS5
|
|
if (login_krb5_get_tickets &&
|
|
k5login(pwd, instance, localhost, p) == 0) {
|
|
rval = 0;
|
|
got_tickets = 1;
|
|
}
|
|
#endif
|
|
#if defined(KERBEROS) || defined(KERBEROS5)
|
|
if (got_tickets)
|
|
goto skip;
|
|
#endif
|
|
#ifdef SKEY
|
|
if (skey_haskey(username) == 0 &&
|
|
skey_passcheck(username, p) != -1) {
|
|
rval = 0;
|
|
goto skip;
|
|
}
|
|
#endif
|
|
if (!sflag && *pwd->pw_passwd != '\0' &&
|
|
!strcmp(crypt(p, pwd->pw_passwd), pwd->pw_passwd)) {
|
|
rval = 0;
|
|
require_chpass = 1;
|
|
goto skip;
|
|
}
|
|
rval = 1;
|
|
|
|
skip:
|
|
memset(p, 0, strlen(p));
|
|
|
|
(void)setpriority(PRIO_PROCESS, 0, 0);
|
|
|
|
ttycheck:
|
|
/*
|
|
* If trying to log in as root without Kerberos,
|
|
* but with insecure terminal, refuse the login attempt.
|
|
*/
|
|
if (pwd && !rval && rootlogin && !rootterm(tty)) {
|
|
(void)fprintf(stderr,
|
|
"%s login refused on this terminal.\n",
|
|
pwd->pw_name);
|
|
if (hostname)
|
|
syslog(LOG_NOTICE,
|
|
"LOGIN %s REFUSED FROM %s ON TTY %s",
|
|
pwd->pw_name, hostname, tty);
|
|
else
|
|
syslog(LOG_NOTICE,
|
|
"LOGIN %s REFUSED ON TTY %s",
|
|
pwd->pw_name, tty);
|
|
continue;
|
|
}
|
|
|
|
if (pwd && !rval)
|
|
break;
|
|
|
|
(void)printf("Login incorrect\n");
|
|
failures++;
|
|
cnt++;
|
|
/* we allow 10 tries, but after 3 we start backing off */
|
|
if (cnt > login_backoff) {
|
|
if (cnt >= login_retries) {
|
|
badlogin(username);
|
|
sleepexit(1);
|
|
}
|
|
sleep((u_int)((cnt - 3) * 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
|
|
|
|
if (pwd->pw_change || pwd->pw_expire)
|
|
(void)gettimeofday(&tp, (struct timezone *)NULL);
|
|
if (pwd->pw_expire) {
|
|
if (tp.tv_sec >= pwd->pw_expire) {
|
|
(void)printf("Sorry -- your account has expired.\n");
|
|
sleepexit(1);
|
|
} else if (pwd->pw_expire - tp.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 (tp.tv_sec >= pwd->pw_change) {
|
|
(void)printf("Sorry -- your password has expired.\n");
|
|
sleepexit(1);
|
|
} else if (pwd->pw_change - tp.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. */
|
|
memset((void *)&utmp, 0, sizeof(utmp));
|
|
(void)time(&utmp.ut_time);
|
|
(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);
|
|
|
|
dolastlog(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 (setusercontext(lc, pwd, pwd->pw_uid,
|
|
LOGIN_SETALL & ~LOGIN_SETPATH) != 0) {
|
|
syslog(LOG_ERR, "setusercontext failed");
|
|
exit(1);
|
|
}
|
|
#else
|
|
(void)setgid(pwd->pw_gid);
|
|
|
|
initgroups(username, pwd->pw_gid);
|
|
|
|
if (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)strncpy(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(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)strncpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ?
|
|
p + 1 : pwd->pw_shell, sizeof(tbuf) - 2);
|
|
|
|
/* 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()
|
|
{
|
|
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()
|
|
{
|
|
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(ttyn)
|
|
char *ttyn;
|
|
{
|
|
struct ttyent *t;
|
|
|
|
return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE);
|
|
}
|
|
|
|
jmp_buf motdinterrupt;
|
|
|
|
void
|
|
motd(fname)
|
|
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(signo)
|
|
int signo;
|
|
{
|
|
|
|
longjmp(motdinterrupt, 1);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
timedout(signo)
|
|
int signo;
|
|
{
|
|
|
|
(void)fprintf(stderr, "Login timed out after %d seconds\n", timeout);
|
|
exit(0);
|
|
}
|
|
|
|
void
|
|
checknologin(fname)
|
|
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);
|
|
}
|
|
}
|
|
|
|
void
|
|
dolastlog(quiet)
|
|
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: %.*s ",
|
|
24, (char *)ctime(&ll.ll_time));
|
|
if (*ll.ll_host != '\0')
|
|
(void)printf("from %.*s\n",
|
|
(int)sizeof(ll.ll_host),
|
|
ll.ll_host);
|
|
else
|
|
(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));
|
|
(void)time(&ll.ll_time);
|
|
(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);
|
|
}
|
|
}
|
|
|
|
void
|
|
badlogin(name)
|
|
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(ttyid)
|
|
const char *ttyid;
|
|
{
|
|
struct ttyent *t;
|
|
|
|
return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : NULL);
|
|
}
|
|
|
|
void
|
|
sleepexit(eval)
|
|
int eval;
|
|
{
|
|
|
|
(void)sleep(5);
|
|
exit(eval);
|
|
}
|