emo/shadow
1
0
Fork 0
Code Issues Pull Requests Packages Releases Activity
5b73a0492d
shadow/src/login.c

1243 lines
30 KiB
C
Raw Blame History

/*
* Copyright (c) 1989 - 1994, Julianne Frances Haugh
* Copyright (c) 1996 - 2001, Marek Michałkiewicz
* Copyright (c) 2001 - 2006, Tomasz Kłoczko
* Copyright (c) 2007 - 2008, Nicolas François
* 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. The name of the copyright holders or contributors may not be used to
* endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
* HOLDERS 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 <config.h>
#ident "$Id$"
#include <errno.h>
#include <grp.h>
#include <lastlog.h>
#ifdef UT_ADDR
#include <netdb.h>
#endif
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include "defines.h"
#include "faillog.h"
#include "failure.h"
#include "getdef.h"
#include "prototypes.h"
#include "pwauth.h"
#include "exitcodes.h"
#ifdef USE_PAM
#include "pam_defs.h"
static pam_handle_t *pamh = NULL;
#define PAM_FAIL_CHECK if (retcode != PAM_SUCCESS) { \
fprintf(stderr,"\n%s\n",pam_strerror(pamh, retcode)); \
SYSLOG((LOG_ERR,"%s",pam_strerror(pamh, retcode))); \
(void) pam_end(pamh, retcode); \
exit(1); \
}
#define PAM_END { retcode = pam_close_session(pamh,0); \
(void) pam_end(pamh,retcode); }
#endif /* USE_PAM */
/*
* Needed for MkLinux DR1/2/2.1 - J.
*/
#ifndef LASTLOG_FILE
#define LASTLOG_FILE "/var/log/lastlog"
#endif
/*
* Global variables
*/
const char *hostname = "";
static struct passwd pwent;
#if HAVE_UTMPX_H
extern struct utmpx utxent;
struct utmpx failent;
#else
struct utmp failent;
#endif
extern struct utmp utent;
struct lastlog lastlog;
static bool pflg = false;
static bool fflg = false;
#ifdef RLOGIN
static bool rflg = false;
#else
#define rflg false
#endif
static bool hflg = false;
static bool preauth_flag = false;
/*
* Global variables.
*/
char *Prog;
static bool amroot;
static int timeout;
/*
* External identifiers.
*/
extern char **newenvp;
extern size_t newenvc;
extern char **environ;
#ifndef ALARM
#define ALARM 60
#endif
#ifndef RETRIES
#define RETRIES 3
#endif
/* local function prototypes */
static void usage (void);
static void setup_tty (void);
static void check_flags (int, char *const *);
#ifndef USE_PAM
static struct faillog faillog;
static void bad_time_notify (void);
static void check_nologin (void);
#endif
static void init_env (void);
static RETSIGTYPE alarm_handler (int);
/*
* usage - print login command usage and exit
*
* login [ name ]
* login -r hostname (for rlogind)
* login -h hostname (for telnetd, etc.)
* login -f name (for pre-authenticated login: datakit, xterm, etc.)
*/
static void usage (void)
{
fprintf (stderr, _("Usage: %s [-p] [name]\n"), Prog);
if (!amroot) {
exit (1);
}
fprintf (stderr, _(" %s [-p] [-h host] [-f name]\n"), Prog);
#ifdef RLOGIN
fprintf (stderr, _(" %s [-p] -r host\n"), Prog);
#endif
exit (1);
}
static void setup_tty (void)
{
TERMIO termio;
GTTY (0, &termio); /* get terminal characteristics */
/*
* Add your favorite terminal modes here ...
*/
termio.c_lflag |= ISIG | ICANON | ECHO | ECHOE;
termio.c_iflag |= ICRNL;
/* leave these values unchanged if not specified in login.defs */
termio.c_cc[VERASE] = getdef_num ("ERASECHAR", termio.c_cc[VERASE]);
termio.c_cc[VKILL] = getdef_num ("KILLCHAR", termio.c_cc[VKILL]);
/*
* ttymon invocation prefers this, but these settings won't come into
* effect after the first username login
*/
STTY (0, &termio);
}
#ifndef USE_PAM
/*
* Tell the user that this is not the right time to login at this tty
*/
static void bad_time_notify (void)
{
(void) puts (_("Invalid login time"));
(void) fflush (stdout);
}
static void check_nologin (void)
{
char *fname;
/*
* Check to see if system is turned off for non-root users.
* This would be useful to prevent users from logging in
* during system maintenance. We make sure the message comes
* out for root so she knows to remove the file if she's
* forgotten about it ...
*/
fname = getdef_str ("NOLOGINS_FILE");
if ((NULL != fname) && (access (fname, F_OK) == 0)) {
FILE *nlfp;
int c;
/*
* Cat the file if it can be opened, otherwise just
* print a default message
*/
nlfp = fopen (fname, "r");
if (NULL != nlfp) {
while ((c = getc (nlfp)) != EOF) {
if (c == '\n') {
(void) putchar ('\r');
}
(void) putchar (c);
}
(void) fflush (stdout);
(void) fclose (nlfp);
} else {
(void) puts (_("\nSystem closed for routine maintenance"));
}
/*
* Non-root users must exit. Root gets the message, but
* gets to login.
*/
if (pwent.pw_uid != 0) {
closelog ();
exit (0);
}
puts (_("\n[Disconnect bypassed -- root login allowed.]"));
}
}
#endif /* !USE_PAM */
static void check_flags (int argc, char *const *argv)
{
int arg;
/*
* Check the flags for proper form. Every argument starting with
* "-" must be exactly two characters long. This closes all the
* clever rlogin, telnet, and getty holes.
*/
for (arg = 1; arg < argc; arg++) {
if (argv[arg][0] == '-' && strlen (argv[arg]) > 2) {
usage ();
}
if (strcmp(argv[arg], "--") == 0) {
break; /* stop checking on a "--" */
}
}
}
static void init_env (void)
{
#ifndef USE_PAM
char *cp;
#endif
char *tmp;
tmp = getenv ("LANG");
if (NULL != tmp) {
addenv ("LANG", tmp);
}
/*
* Add the timezone environmental variable so that time functions
* work correctly.
*/
tmp = getenv ("TZ");
if (NULL != tmp) {
addenv ("TZ", tmp);
}
#ifndef USE_PAM
else {
cp = getdef_str ("ENV_TZ");
if (NULL != cp) {
addenv (('/' == *cp) ? tz (cp) : cp, NULL);
}
}
#endif /* !USE_PAM */
/*
* Add the clock frequency so that profiling commands work
* correctly.
*/
tmp = getenv ("HZ");
if (NULL != tmp) {
addenv ("HZ", tmp);
}
#ifndef USE_PAM
else {
cp = getdef_str ("ENV_HZ");
if (NULL != cp) {
addenv (cp, NULL);
}
}
#endif /* !USE_PAM */
}
static RETSIGTYPE alarm_handler (unused int sig)
{
fprintf (stderr, _("\nLogin timed out after %d seconds.\n"), timeout);
exit (0);
}
/*
* login - create a new login session for a user
*
* login is typically called by getty as the second step of a
* new user session. getty is responsible for setting the line
* characteristics to a reasonable set of values and getting
* the name of the user to be logged in. login may also be
* called to create a new user session on a pty for a variety
* of reasons, such as X servers or network logins.
*
* the flags which login supports are
*
* -p - preserve the environment
* -r - perform autologin protocol for rlogin
* -f - do not perform authentication, user is preauthenticated
* -h - the name of the remote host
*/
int main (int argc, char **argv)
{
char username[32];
char tty[BUFSIZ];
#ifdef RLOGIN
char term[128] = "";
#endif
#if defined(HAVE_STRFTIME) && !defined(USE_PAM)
char ptime[80];
#endif
int reason = PW_LOGIN;
int delay;
int retries;
bool failed;
int flag;
bool subroot = false;
#ifndef USE_PAM
bool is_console;
#endif
int err;
const char *cp;
char *tmp;
char fromhost[512];
struct passwd *pwd;
char **envp = environ;
static char temp_pw[2];
static char temp_shell[] = "/bin/sh";
#ifdef USE_PAM
int retcode;
pid_t child;
char *pam_user;
char **ptr_pam_user = &pam_user;
#else
struct spwd *spwd = NULL;
#endif
/*
* Some quick initialization.
*/
sanitize_env ();
(void) setlocale (LC_ALL, "");
(void) bindtextdomain (PACKAGE, LOCALEDIR);
(void) textdomain (PACKAGE);
initenv ();
username[0] = '\0';
amroot = (getuid () == 0);
Prog = Basename (argv[0]);
check_flags (argc, argv);
while ((flag = getopt (argc, argv, "d:f::h:pr:")) != EOF) {
switch (flag) {
case 'd':
/* "-d device" ignored for compatibility */
break;
case 'f':
/*
* username must be a separate token
* (-f root, *not* -froot). --marekm
*
* if -f has an arg, use that, else use the
* normal user name passed after all options
* --benc
*/
if (optarg != NULL && optarg != argv[optind - 1]) {
usage ();
}
fflg = true;
if (optarg) {
STRFCPY (username, optarg);
}
break;
case 'h':
hflg = true;
hostname = optarg;
reason = PW_TELNET;
break;
#ifdef RLOGIN
case 'r':
rflg = true;
hostname = optarg;
reason = PW_RLOGIN;
break;
#endif
case 'p':
pflg = true;
break;
default:
usage ();
}
}
#ifdef RLOGIN
/*
* Neither -h nor -f should be combined with -r.
*/
if (rflg && (hflg || fflg)) {
usage ();
}
#endif
/*
* Allow authentication bypass only if real UID is zero.
*/
if ((rflg || fflg || hflg) && !amroot) {
fprintf (stderr, _("%s: Permission denied.\n"), Prog);
exit (1);
}
if ((isatty (0) == 0) || (isatty (1) == 0) || (isatty (2) == 0)) {
exit (1); /* must be a terminal */
}
/*
* Be picky if run by normal users (possible if installed setuid
* root), but not if run by root. This way it still allows logins
* even if your getty is broken, or if something corrupts utmp,
* but users must "exec login" which will use the existing utmp
* entry (will not overwrite remote hostname). --marekm
*/
checkutmp (!amroot);
STRFCPY (tty, utent.ut_line);
#ifndef USE_PAM
is_console = console (tty);
#endif
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
*/
he = gethostbyname (hostname);
if (NULL != he) {
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 (fflg) {
preauth_flag = true;
}
if (hflg) {
reason = PW_RLOGIN;
}
#ifdef RLOGIN
if ( rflg
&& do_rlogin (hostname, username, sizeof username,
term, sizeof term)) {
preauth_flag = true;
}
#endif
OPENLOG ("login");
setup_tty ();
#ifndef USE_PAM
umask (getdef_num ("UMASK", GETDEF_DEFAULT_UMASK));
{
/*
* 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);
}
}
#endif
/*
* The entire environment will be preserved if the -p flag
* is used.
*/
if (pflg) {
while (NULL != *envp) { /* add inherited environment, */
addenv (*envp, NULL); /* some variables change later */
envp++;
}
}
#ifdef RLOGIN
if (term[0] != '\0') {
addenv ("TERM", term);
} else
#endif
{
/* preserve TERM from getty */
if (!pflg) {
tmp = getenv ("TERM");
if (NULL != tmp) {
addenv ("TERM", tmp);
}
}
}
init_env ();
if (optind < argc) { /* get the user name */
if (rflg || (fflg && ('\0' != username[0]))) {
usage ();
}
STRFCPY (username, argv[optind]);
strzero (argv[optind]);
++optind;
}
if (optind < argc) { /* now set command line variables */
set_env (argc - optind, &argv[optind]);
}
if (rflg || hflg) {
cp = hostname;
} else {
/* FIXME: What is the priority:
* UT_HOST or HAVE_UTMPX_H? */
#ifdef UT_HOST
if ('\0' != utent.ut_host[0]) {
cp = utent.ut_host;
} else
#endif
#if HAVE_UTMPX_H
if ('\0' != utxent.ut_host[0]) {
cp = utxent.ut_host;
} else
#endif
{
cp = "";
}
}
if ('\0' != *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 */
(void) 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
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. We also set PAM's fail delay to
* ours.
*/
retcode = pam_set_item (pamh, PAM_RHOST, hostname);
PAM_FAIL_CHECK;
retcode = pam_set_item (pamh, PAM_TTY, tty);
PAM_FAIL_CHECK;
#ifdef HAS_PAM_FAIL_DELAY
retcode = pam_fail_delay (pamh, 1000000 * delay);
PAM_FAIL_CHECK;
#endif
/* if fflg, then the user has already been authenticated */
if (!fflg || (getuid () != 0)) {
int failcount = 0;
char hostn[256];
char loginprompt[256]; /* That's one hell of a prompt :) */
/* Make the login prompt look like we want it */
if (gethostname (hostn, sizeof (hostn)) == 0) {
snprintf (loginprompt,
sizeof (loginprompt),
_("%s login: "), hostn);
} else {
snprintf (loginprompt,
sizeof (loginprompt), _("login: "));
}
retcode =
pam_set_item (pamh, PAM_USER_PROMPT, loginprompt);
PAM_FAIL_CHECK;
/* if we didn't get a user on the command line,
set it to NULL */
pam_get_item (pamh, PAM_USER,
(const void **)ptr_pam_user);
if (pam_user[0] == '\0') {
pam_set_item (pamh, PAM_USER, NULL);
}
/*
* 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?
*/
failcount = 0;
while (true) {
const char *failent_user;
failed = false;
failcount++;
#ifdef HAS_PAM_FAIL_DELAY
if (delay > 0) {
retcode = pam_fail_delay(pamh, 1000000*delay);
}
#endif
retcode = pam_authenticate (pamh, 0);
pam_get_item (pamh, PAM_USER,
(const void **) ptr_pam_user);
if ((NULL != pam_user) && ('\0' != pam_user[0])) {
pwd = xgetpwnam(pam_user);
if (NULL != pwd) {
pwent = *pwd;
failent_user = pwent.pw_name;
} else {
if ( getdef_bool("LOG_UNKFAIL_ENAB")
&& (NULL != pam_user)) {
failent_user = pam_user;
} else {
failent_user = "UNKNOWN";
}
}
} else {
pwd = NULL;
failent_user = "UNKNOWN";
}
if (retcode == PAM_MAXTRIES || failcount >= retries) {
SYSLOG ((LOG_NOTICE,
"TOO MANY LOGIN TRIES (%d)%s FOR '%s'",
failcount, fromhost, failent_user));
fprintf(stderr,
_("Maximum number of tries exceeded (%d)\n"),
failcount);
PAM_END;
exit(0);
} else if (retcode == PAM_ABORT) {
/* Serious problems, quit now */
fputs (_("login: abort requested by PAM\n"),stderr);
SYSLOG ((LOG_ERR,"PAM_ABORT returned from pam_authenticate()"));
PAM_END;
exit(99);
} else if (retcode != PAM_SUCCESS) {
SYSLOG ((LOG_NOTICE,"FAILED LOGIN (%d)%s FOR '%s', %s",
failcount, fromhost, failent_user,
pam_strerror (pamh, retcode)));
failed = true;
}
if (!failed) {
break;
}
#ifdef WITH_AUDIT
audit_fd = audit_open ();
audit_log_acct_message (audit_fd,
AUDIT_USER_LOGIN,
NULL, /* Prog. name */
"login",
failent_user,
AUDIT_NO_ID,
hostname,
NULL, /* addr */
tty,
0); /* result */
close (audit_fd);
#endif /* WITH_AUDIT */
fprintf (stderr, "\nLogin incorrect\n");
/* Let's give it another go around */
pam_set_item (pamh, PAM_USER, NULL);
}
/* We don't get here unless they were authenticated above */
alarm (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 **)ptr_pam_user);
pwd = xgetpwnam (pam_user);
if (NULL == pwd) {
SYSLOG ((LOG_ERR, "xgetpwnam(%s) failed",
getdef_bool ("LOG_UNKFAIL_ENAB") ?
pam_user : "UNKNOWN"));
exit (1);
}
if (fflg) {
retcode = pam_acct_mgmt (pamh, 0);
PAM_FAIL_CHECK;
}
if (setup_groups (pwd) != 0) {
exit (1);
}
pwent = *pwd;
retcode = pam_setcred (pamh, PAM_ESTABLISH_CRED);
PAM_FAIL_CHECK;
retcode = pam_open_session (pamh,
hushed (&pwent) ? PAM_SILENT : 0);
PAM_FAIL_CHECK;
pwd = xgetpwnam (pam_user);
if (NULL == pwd) {
pwent.pw_name = pam_user;
strcpy (temp_pw, "!");
pwent.pw_passwd = temp_pw;
pwent.pw_shell = temp_shell;
preauth_flag = false;
failed = true;
} else {
pwent = *pwd;
}
#else /* ! USE_PAM */
while (true) { /* repeatedly get login/password pairs */
failed = false; /* haven't failed authentication yet */
if ('\0' == username[0]) { /* need to get a login id */
if (subroot) {
closelog ();
exit (1);
}
preauth_flag = false;
login_prompt (_("\n%s login: "), username,
sizeof username);
continue;
}
pwd = xgetpwnam (username);
if (NULL == pwd) {
pwent.pw_name = username;
strcpy (temp_pw, "!");
pwent.pw_passwd = temp_pw;
pwent.pw_shell = temp_shell;
preauth_flag = false;
failed = true;
} else {
pwent = *pwd;
}
spwd = NULL;
if ( (NULL != pwd)
&& (strcmp (pwd->pw_passwd, SHADOW_PASSWD_STRING) == 0)) {
/* !USE_PAM, no need for xgetspnam */
spwd = getspnam (username);
if (NULL != spwd) {
pwent.pw_passwd = spwd->sp_pwdp;
} else {
SYSLOG ((LOG_WARN,
"no shadow password for '%s'%s",
username, fromhost));
}
}
/*
* 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 = true;
}
/*
* The -r and -f flags provide a name which has already
* been authenticated by some server.
*/
if (preauth_flag) {
goto auth_ok;
}
if (pw_auth (pwent.pw_passwd, username,
reason, (char *) 0) == 0) {
goto auth_ok;
}
/*
* 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, "invalid password for '%s' %s",
( (NULL != pwd)
|| getdef_bool ("LOG_UNKFAIL_ENAB")) ?
username : "UNKNOWN", fromhost));
failed = true;
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 ( !failed
&& (NULL != pwent.pw_name)
&& (0 == pwent.pw_uid)
&& !is_console) {
SYSLOG ((LOG_CRIT, "ILLEGAL ROOT LOGIN %s", fromhost));
failed = true;
}
if ( !failed
&& !login_access (username, *hostname ? hostname : tty)) {
SYSLOG ((LOG_WARN, "LOGIN '%s' REFUSED %s",
username, fromhost));
failed = true;
}
if ( (NULL != pwd)
&& getdef_bool ("FAILLOG_ENAB")
&& !failcheck (pwent.pw_uid, &faillog, failed)) {
SYSLOG ((LOG_CRIT,
"exceeded failure limit for '%s' %s",
username, fromhost));
failed = true;
}
if (!failed) {
break;
}
/* don't log non-existent users */
if ((NULL != 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;
if (sizeof (failent.ut_tv) == sizeof (struct timeval)) {
gettimeofday ((struct timeval *) &failent.ut_tv,
NULL);
} else {
struct timeval tv;
gettimeofday (&tv, NULL);
failent.ut_tv.tv_sec = tv.tv_sec;
failent.ut_tv.tv_usec = tv.tv_usec;
}
#else
failent = utent;
failent.ut_time = time (NULL);
#endif
if (NULL != 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));
failent.ut_type = USER_PROCESS;
failtmp (&failent);
}
memzero (username, sizeof username);
retries--;
if (retries <= 0) {
SYSLOG ((LOG_CRIT, "REPEATED login failures%s",
fromhost));
}
/*
* 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);
}
/*
* 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 (true) */
#endif /* ! USE_PAM */
alarm (0); /* turn off alarm clock */
#ifndef USE_PAM /* PAM does this */
/*
* 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, "invalid login time for '%s'%s",
username, fromhost));
closelog ();
bad_time_notify ();
exit (1);
}
check_nologin ();
#endif
if (getenv ("IFS")) { /* don't export user IFS ... */
addenv ("IFS= \t\n", NULL); /* ... instead, set a safe IFS */
}
#ifdef USE_PAM
setutmp (pam_user, tty, hostname); /* make entry in utmp & wtmp files */
#else
setutmp (username, tty, hostname); /* make entry in utmp & wtmp files */
#endif
if (pwent.pw_shell[0] == '*') { /* subsystem root */
pwent.pw_shell++; /* skip the '*' */
subsystem (&pwent); /* figure out what to execute */
subroot = true; /* say I was here again */
endpwent (); /* close all of the file which were */
endgrent (); /* open in the original rooted file */
endspent (); /* system. they will be re-opened */
#ifdef SHADOWGRP
endsgent (); /* in the new rooted file system */
#endif
goto top; /* go do all this all over again */
}
#ifdef WITH_AUDIT
audit_fd = audit_open ();
audit_log_acct_message (audit_fd,
AUDIT_USER_LOGIN,
NULL, /* Prog. name */
"login",
pwd->pw_name,
AUDIT_NO_ID,
hostname,
NULL, /* addr */
tty,
1); /* result */
close (audit_fd);
#endif /* WITH_AUDIT */
#ifndef USE_PAM /* pam_lastlog handles this */
if (getdef_bool ("LASTLOG_ENAB")) { /* give last login and log this one */
dolastlog (&lastlog, &pwent, utent.ut_line, hostname);
}
#endif
#ifndef USE_PAM /* PAM handles this as well */
/*
* 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
*/
if (spwd) { /* check for age of password */
if (expire (&pwent, spwd)) {
/* !USE_PAM, no need for xgetpwnam */
pwd = getpwnam (username);
/* !USE_PAM, no need for xgetspnam */
spwd = getspnam (username);
if (pwd) {
pwent = *pwd;
}
}
}
setup_limits (&pwent); /* nice, ulimit etc. */
#endif /* ! USE_PAM */
chown_tty (tty, &pwent);
#ifdef USE_PAM
/*
* We must fork before setuid() because we need to call
* pam_close_session() as root.
*/
(void) signal (SIGINT, SIG_IGN);
child = fork ();
if (child < 0) {
/* error in fork() */
fprintf (stderr, _("%s: failure forking: %s"),
Prog, strerror (errno));
PAM_END;
exit (0);
} else if (child != 0) {
/*
* parent - wait for child to finish, then cleanup
* session
*/
wait (NULL);
PAM_END;
exit (0);
}
/* child */
#endif
/* If we were init, we need to start a new session */
if (getppid() == 1) {
setsid();
if (ioctl(0, TIOCSCTTY, 1) != 0) {
fprintf (stderr,_("TIOCSCTTY failed on %s"),tty);
}
}
/* We call set_groups() above because this clobbers pam_groups.so */
#ifndef USE_PAM
if (setup_uid_gid (&pwent, is_console))
#else
if (change_uid (&pwent))
#endif
{
exit (1);
}
setup_env (&pwent); /* set env vars, cd to the home dir */
#ifdef USE_PAM
{
const char *const *env;
env = (const char *const *) pam_getenvlist (pamh);
while ((NULL != env) && (NULL != *env)) {
addenv (*env, NULL);
env++;
}
}
#endif
(void) setlocale (LC_ALL, "");
(void) bindtextdomain (PACKAGE, LOCALEDIR);
(void) textdomain (PACKAGE);
if (!hushed (&pwent)) {
addenv ("HUSHLOGIN=FALSE", NULL);
/*
* pam_unix, pam_mail and pam_lastlog should take care of
* this
*/
#ifndef USE_PAM
motd (); /* print the message of the day */
if ( getdef_bool ("FAILLOG_ENAB")
&& (0 != faillog.fail_cnt)) {
failprint (&faillog);
/* Reset the lockout times if logged in */
if ( (0 != faillog.fail_max)
&& (faillog.fail_cnt >= faillog.fail_max)) {
puts (_
("Warning: login re-enabled after temporary lockout."));
SYSLOG ((LOG_WARN,
"login '%s' re-enabled after temporary lockout (%d failures)",
username, (int) faillog.fail_cnt));
}
}
if ( getdef_bool ("LASTLOG_ENAB")
&& (lastlog.ll_time != 0)) {
time_t ll_time = lastlog.ll_time;
#ifdef HAVE_STRFTIME
strftime (ptime, sizeof (ptime),
"%a %b %e %H:%M:%S %z %Y",
localtime (&ll_time));
printf (_("Last login: %s on %s"),
ptime, lastlog.ll_line);
#else
printf (_("Last login: %.19s on %s"),
ctime (&ll_time), lastlog.ll_line);
#endif
#ifdef HAVE_LL_HOST /* __linux__ || SUN4 */
if ('\0' != lastlog.ll_host[0]) {
printf (_(" from %.*s"),
(int) sizeof lastlog.
ll_host, lastlog.ll_host);
}
#endif
printf (".\n");
}
agecheck (&pwent, spwd);
mailcheck (); /* report on the status of mail */
#endif /* !USE_PAM */
} else {
addenv ("HUSHLOGIN=TRUE", NULL);
}
if ( (NULL != getdef_str ("TTYTYPE_FILE"))
&& (NULL == getenv ("TERM"))) {
ttytype (tty);
}
(void) signal (SIGQUIT, SIG_DFL); /* default quit signal */
(void) signal (SIGTERM, SIG_DFL); /* default terminate signal */
(void) signal (SIGALRM, SIG_DFL); /* default alarm signal */
(void) signal (SIGHUP, SIG_DFL); /* added this. --marekm */
(void) signal (SIGINT, SIG_DFL); /* default interrupt signal */
endpwent (); /* stop access to password file */
endgrent (); /* stop access to group file */
endspent (); /* stop access to shadow passwd file */
#ifdef SHADOWGRP
endsgent (); /* stop access to shadow group file */
#endif
if (0 == pwent.pw_uid) {
SYSLOG ((LOG_NOTICE, "ROOT LOGIN %s", fromhost));
} else if (getdef_bool ("LOG_OK_LOGINS")) {
#ifdef USE_PAM
SYSLOG ((LOG_INFO, "'%s' logged in %s", pam_user, fromhost));
#else
SYSLOG ((LOG_INFO, "'%s' logged in %s", username, fromhost));
#endif
}
closelog ();
tmp = getdef_str ("FAKE_SHELL");
if (NULL != tmp) {
err = shell (tmp, pwent.pw_shell, newenvp); /* fake shell */
} else {
/* exec the shell finally */
err = shell (pwent.pw_shell, (char *) 0, newenvp);
}
exit (err == ENOENT ? E_CMD_NOTFOUND : E_CMD_NOEXEC);
/* NOT REACHED */
return 0;
}
Reference in New Issue View Git Blame Copy Permalink