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Linux Cubed Series 7: Sunsite
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skey-2.000
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skey-2
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skey-2.2
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login
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login.c
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C/C++ Source or Header
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1995-04-02
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/* This program is derived from 4.3 BSD software and is
subject to the copyright notice below.
The port to HP-UX has been motivated by the incapability
of 'rlogin'/'rlogind' as per HP-UX 6.5 (and 7.0) to transfer window sizes.
Changes:
- General HP-UX portation. Use of facilities not available
in HP-UX (e.g. setpriority) has been eliminated.
Utmp/wtmp handling has been ported.
- The program uses BSD command line options to be used
in connection with e.g. 'rlogind' i.e. 'new login'.
- HP features left out: logging of bad login attempts in /etc/btmp,
they are sent to syslog
password expiry
'*' as login shell, add it if you need it
- BSD features left out: quota checks
password expiry
analysis of terminal type (tset feature)
- BSD features thrown in: Security logging to syslogd.
This requires you to have a (ported) syslog
system -- 7.0 comes with syslog
'Lastlog' feature.
- A lot of nitty gritty details has been adjusted in favour of
HP-UX, e.g. /etc/securetty, default paths and the environment
variables assigned by 'login'.
- We do *nothing* to setup/alter tty state, under HP-UX this is
to be done by getty/rlogind/telnetd/some one else.
Michael Glad (glad@daimi.dk)
Computer Science Department
Aarhus University
Denmark
1990-07-04
1991-09-24 glad@daimi.aau.dk: HP-UX 8.0 port:
- now explictly sets non-blocking mode on descriptors
- strcasecmp is now part of HP-UX
1992-02-05 poe@daimi.aau.dk: Ported the stuff to Linux 0.12
From 1992 till now (1995) this code for Linux has been maintained at
ftp.daimi.aau.dk:/pub/linux/poe/
*/
/*
* Copyright (c) 1980, 1987, 1988 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1980, 1987, 1988 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)login.c 5.40 (Berkeley) 5/9/89";
#endif /* not lint */
/*
* login [ name ]
* login -h hostname (for telnetd, etc.)
* login -f name (for pre-authenticated login: datakit, xterm, etc.)
*/
/* #define TESTING */
#ifdef TESTING
#include "param.h"
#else
#include <sys/param.h>
#endif
#include <ctype.h>
#include <unistd.h>
#include <getopt.h>
#include <memory.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/file.h>
#include <termios.h>
#include <string.h>
#define index strchr
#define rindex strrchr
#include <sys/ioctl.h>
#include <signal.h>
#include <errno.h>
#include <grp.h>
#include <pwd.h>
#include <setjmp.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/syslog.h>
#include <sys/sysmacros.h>
#include <netdb.h>
#ifdef SKEY
# include <skey.h>
#endif
#ifdef TESTING
# include "utmp.h"
#else
# include <utmp.h>
#endif
#ifdef SHADOW_PWD
#include <shadow.h>
#endif
#ifndef linux
#include <tzfile.h>
#include <lastlog.h>
#else
struct lastlog
{ long ll_time;
char ll_line[12];
char ll_host[16];
};
#endif
#include "pathnames.h"
#define P_(s) ()
void opentty P_((const char *tty));
void getloginname P_((void));
void timedout P_((void));
int rootterm P_((char *ttyn));
void motd P_((void));
void sigint P_((void));
void checknologin P_((void));
void dolastlog P_((int quiet));
void badlogin P_((char *name));
char *stypeof P_((char *ttyid));
void checktty P_((char *user, char *tty));
void getstr P_((char *buf, int cnt, char *err));
void sleepexit P_((int eval));
#undef P_
#ifdef KERBEROS
#include <kerberos/krb.h>
#include <sys/termios.h>
char realm[REALM_SZ];
int kerror = KSUCCESS, notickets = 1;
#endif
#ifndef linux
#define TTYGRPNAME "tty" /* name of group to own ttys */
#else
# define TTYGRPNAME "other"
# ifndef MAXPATHLEN
# define MAXPATHLEN 1024
# endif
#endif
/*
* This bounds the time given to login. Not a define so it can
* be patched on machines where it's too small.
*/
#ifndef linux
int timeout = 300;
#else
int timeout = 60;
#endif
struct passwd *pwd;
int failures;
char term[64], *hostname, *username, *tty;
char thishost[100];
#ifndef linux
struct sgttyb sgttyb;
struct tchars tc = {
CINTR, CQUIT, CSTART, CSTOP, CEOT, CBRK
};
struct ltchars ltc = {
CSUSP, CDSUSP, CRPRNT, CFLUSH, CWERASE, CLNEXT
};
#endif
char *months[] =
{ "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug",
"Sep", "Oct", "Nov", "Dec" };
/* provided by Linus Torvalds 16-Feb-93 */
void
opentty(const char * tty)
{
int i;
int fd = open(tty, O_RDWR);
for (i = 0 ; i < fd ; i++)
close(i);
for (i = 0 ; i < 3 ; i++)
dup2(fd, i);
if (fd >= 3)
close(fd);
}
int
main(argc, argv)
int argc;
char **argv;
{
extern int errno, optind;
extern char *optarg, **environ;
struct timeval tp;
struct tm *ttp;
struct group *gr;
register int ch;
register char *p;
int ask, fflag, hflag, pflag, cnt;
int quietlog, passwd_req, ioctlval;
char *domain, *salt, *ttyn, *pp;
char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10];
char *ctime(), *ttyname(), *stypeof();
time_t time();
void timedout();
char *termenv;
#ifdef SKEY
int permit_passwd = 0;
#endif
#ifdef linux
char tmp[100];
/* Just as arbitrary as mountain time: */
/* (void)setenv("TZ", "MET-1DST",0); */
#endif
(void)signal(SIGALRM, timedout);
(void)alarm((unsigned int)timeout);
(void)signal(SIGQUIT, SIG_IGN);
(void)signal(SIGINT, SIG_IGN);
(void)setpriority(PRIO_PROCESS, 0, 0);
#ifdef HAVE_QUOTA
(void)quota(Q_SETUID, 0, 0, 0);
#endif
/*
* -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
*/
(void)gethostname(tbuf, sizeof(tbuf));
(void)strncpy(thishost, tbuf, sizeof(thishost)-1);
domain = index(tbuf, '.');
fflag = hflag = pflag = 0;
passwd_req = 1;
while ((ch = getopt(argc, argv, "fh:p")) != EOF)
switch (ch) {
case 'f':
fflag = 1;
break;
case 'h':
if (getuid()) {
(void)fprintf(stderr,
"login: -h for super-user only.\n");
exit(1);
}
hflag = 1;
if (domain && (p = index(optarg, '.')) &&
strcasecmp(p, domain) == 0)
*p = 0;
hostname = optarg;
break;
case 'p':
pflag = 1;
break;
case '?':
default:
(void)fprintf(stderr,
"usage: login [-fp] [username]\n");
exit(1);
}
argc -= optind;
argv += optind;
if (*argv) {
username = *argv;
ask = 0;
} else
ask = 1;
#ifndef linux
ioctlval = 0;
(void)ioctl(0, TIOCLSET, &ioctlval);
(void)ioctl(0, TIOCNXCL, 0);
(void)fcntl(0, F_SETFL, ioctlval);
(void)ioctl(0, TIOCGETP, &sgttyb);
sgttyb.sg_erase = CERASE;
sgttyb.sg_kill = CKILL;
(void)ioctl(0, TIOCSLTC, <c);
(void)ioctl(0, TIOCSETC, &tc);
(void)ioctl(0, TIOCSETP, &sgttyb);
/*
* Be sure that we're in
* blocking mode!!!
* This is really for HPUX
*/
ioctlval = 0;
(void)ioctl(0, FIOSNBIO, &ioctlval);
#endif
for (cnt = getdtablesize(); cnt > 2; cnt--)
close(cnt);
ttyn = ttyname(0);
if (ttyn == NULL || *ttyn == '\0') {
(void)sprintf(tname, "%s??", _PATH_TTY);
ttyn = tname;
}
setpgrp();
{
struct termios tt, ttt;
tcgetattr(0, &tt);
ttt = tt;
ttt.c_cflag &= ~HUPCL;
if((chown(ttyn, 0, 0) == 0) && (chmod(ttyn, 0622) == 0)) {
tcsetattr(0,TCSAFLUSH,&ttt);
signal(SIGHUP, SIG_IGN); /* so vhangup() wont kill us */
vhangup();
signal(SIGHUP, SIG_DFL);
}
setsid();
/* re-open stdin,stdout,stderr after vhangup() closed them */
/* if it did, after 0.99.5 it doesn't! */
opentty(ttyn);
tcsetattr(0,TCSAFLUSH,&tt);
}
if (tty = rindex(ttyn, '/'))
++tty;
else
tty = ttyn;
openlog("login", LOG_ODELAY, LOG_AUTH);
for (cnt = 0;; ask = 1) {
ioctlval = 0;
#ifndef linux
(void)ioctl(0, TIOCSETD, &ioctlval);
#endif
if (ask) {
fflag = 0;
getloginname();
}
checktty(username, tty);
(void)strcpy(tbuf, username);
if (pwd = getpwnam(username))
salt = pwd->pw_passwd;
else
salt = "xx";
/* if user not super-user, check for disabled logins */
if (pwd == NULL || pwd->pw_uid)
checknologin();
/*
* Disallow automatic login to root; if not invoked by
* root, disallow if the uid's differ.
*/
if (fflag && pwd) {
int uid = getuid();
passwd_req = pwd->pw_uid == 0 ||
(uid && uid != pwd->pw_uid);
}
/*
* If trying to log in as root, but with insecure terminal,
* refuse the login attempt.
*/
if (pwd && pwd->pw_uid == 0 && !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 no pre-authentication and a password exists
* for this user, prompt for one and verify it.
*/
if (!passwd_req || (pwd && !*pwd->pw_passwd))
break;
setpriority(PRIO_PROCESS, 0, -4);
#ifdef SKEY
permit_passwd = skeyaccess(username, tty,
hostname ? hostname : NULL,
NULL);
pp = skey_getpass("Password:", pwd, permit_passwd);
p = skey_crypt(pp, salt, pwd, permit_passwd);
#else
pp = getpass("Password: ");
p = crypt(pp, salt);
#endif
setpriority(PRIO_PROCESS, 0, 0);
#ifdef KERBEROS
/*
* If not present in pw file, act as we normally would.
* If we aren't Kerberos-authenticated, try the normal
* pw file for a password. If that's ok, log the user
* in without issueing any tickets.
*/
if (pwd && !krb_get_lrealm(realm,1)) {
/*
* get TGT for local realm; be careful about uid's
* here for ticket file ownership
*/
(void)setreuid(geteuid(),pwd->pw_uid);
kerror = krb_get_pw_in_tkt(pwd->pw_name, "", realm,
"krbtgt", realm, DEFAULT_TKT_LIFE, pp);
(void)setuid(0);
if (kerror == INTK_OK) {
memset(pp, 0, strlen(pp));
notickets = 0; /* user got ticket */
break;
}
}
#endif
(void) memset(pp, 0, strlen(pp));
if (pwd && !strcmp(p, pwd->pw_passwd))
break;
(void)printf("Login incorrect\n");
failures++;
badlogin(username); /* log ALL bad logins */
/* we allow 10 tries, but after 3 we start backing off */
if (++cnt > 3) {
if (cnt >= 10) {
sleepexit(1);
}
sleep((unsigned int)((cnt - 3) * 5));
}
}
/* committed to login -- turn off timeout */
(void)alarm((unsigned int)0);
#ifdef HAVE_QUOTA
if (quota(Q_SETUID, pwd->pw_uid, 0, 0) < 0 && errno != EINVAL) {
switch(errno) {
case EUSERS:
(void)fprintf(stderr,
"Too many users logged on already.\nTry again later.\n");
break;
case EPROCLIM:
(void)fprintf(stderr,
"You have too many processes running.\n");
break;
default:
perror("quota (Q_SETUID)");
}
sleepexit(0);
}
#endif
/* paranoia... */
endpwent();
/* This requires some explanation: As root we may not be able to
read the directory of the user if it is on an NFS mounted
filesystem. We temporarily set our effective uid to the user-uid
making sure that we keep root privs. in the real uid.
A portable solution would require a fork(), but we rely on Linux
having the BSD setreuid() */
{
char tmpstr[MAXPATHLEN];
uid_t ruid = getuid();
gid_t egid = getegid();
strncpy(tmpstr, pwd->pw_dir, MAXPATHLEN-12);
strncat(tmpstr, ("/" _PATH_HUSHLOGIN), MAXPATHLEN);
setregid(-1, pwd->pw_gid);
setreuid(0, pwd->pw_uid);
quietlog = (access(tmpstr, R_OK) == 0);
setuid(0); /* setreuid doesn't do it alone! */
setreuid(ruid, 0);
setregid(-1, egid);
}
#ifndef linux
#ifdef KERBEROS
if (notickets && !quietlog)
(void)printf("Warning: no Kerberos tickets issued\n");
#endif
#define TWOWEEKS (14*24*60*60)
if (pwd->pw_change || pwd->pw_expire)
(void)gettimeofday(&tp, (struct timezone *)NULL);
if (pwd->pw_change)
if (tp.tv_sec >= pwd->pw_change) {
(void)printf("Sorry -- your password has expired.\n");
sleepexit(1);
}
else if (tp.tv_sec - pwd->pw_change < TWOWEEKS && !quietlog) {
ttp = localtime(&pwd->pw_change);
(void)printf("Warning: your password expires on %s %d, %d\n",
months[ttp->tm_mon], ttp->tm_mday, TM_YEAR_BASE + ttp->tm_year);
}
if (pwd->pw_expire)
if (tp.tv_sec >= pwd->pw_expire) {
(void)printf("Sorry -- your account has expired.\n");
sleepexit(1);
}
else if (tp.tv_sec - pwd->pw_expire < TWOWEEKS && !quietlog) {
ttp = localtime(&pwd->pw_expire);
(void)printf("Warning: your account expires on %s %d, %d\n",
months[ttp->tm_mon], ttp->tm_mday, TM_YEAR_BASE + ttp->tm_year);
}
/* nothing else left to fail -- really log in */
{
struct utmp utmp;
memset((char *)&utmp, 0, sizeof(utmp));
(void)time(&utmp.ut_time);
strncpy(utmp.ut_name, username, sizeof(utmp.ut_name));
if (hostname)
strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host));
strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line));
login(&utmp);
}
#else
/* for linux, write entries in utmp and wtmp */
{
struct utmp ut;
char *ttyabbrev;
int wtmp;
memset((char *)&ut, 0, sizeof(ut));
ut.ut_type = USER_PROCESS;
ut.ut_pid = getpid();
strncpy(ut.ut_line, ttyn + sizeof("/dev/")-1, sizeof(ut.ut_line));
ttyabbrev = ttyn + sizeof("/dev/tty") - 1;
strncpy(ut.ut_id, ttyabbrev, sizeof(ut.ut_id));
(void)time(&ut.ut_time);
strncpy(ut.ut_user, username, sizeof(ut.ut_user));
/* fill in host and ip-addr fields when we get networking */
if (hostname) {
struct hostent *he;
strncpy(ut.ut_host, hostname, sizeof(ut.ut_host));
if ((he = gethostbyname(hostname)))
memcpy(&ut.ut_addr, he->h_addr_list[0],
sizeof(ut.ut_addr));
}
utmpname(_PATH_UTMP);
setutent();
pututline(&ut);
endutent();
if((wtmp = open(_PATH_WTMP, O_APPEND|O_WRONLY)) >= 0) {
flock(wtmp, LOCK_EX);
write(wtmp, (char *)&ut, sizeof(ut));
flock(wtmp, LOCK_UN);
close(wtmp);
}
}
/* fix_utmp_type_and_user(username, ttyn, LOGIN_PROCESS); */
#endif
dolastlog(quietlog);
#ifndef linux
if (!hflag) { /* XXX */
static struct winsize win = { 0, 0, 0, 0 };
(void)ioctl(0, TIOCSWINSZ, &win);
}
#endif
(void)chown(ttyn, pwd->pw_uid,
(gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid);
(void)chmod(ttyn, 0622);
(void)setgid(pwd->pw_gid);
initgroups(username, pwd->pw_gid);
#ifdef HAVE_QUOTA
quota(Q_DOWARN, pwd->pw_uid, (dev_t)-1, 0);
#endif
if (*pwd->pw_shell == '\0')
pwd->pw_shell = _PATH_BSHELL;
#ifndef linux
/* turn on new line discipline for the csh */
else if (!strcmp(pwd->pw_shell, _PATH_CSHELL)) {
ioctlval = NTTYDISC;
(void)ioctl(0, TIOCSETD, &ioctlval);
}
#endif
/* preserve TERM even without -p flag */
{
char *ep;
if(!((ep = getenv("TERM")) && (termenv = strdup(ep))))
termenv = "dumb";
}
/* destroy environment unless user has requested preservation */
if (!pflag)
{
environ = (char**)malloc(sizeof(char*));
memset(environ, 0, sizeof(char*));
}
#ifndef linux
(void)setenv("HOME", pwd->pw_dir, 1);
(void)setenv("SHELL", pwd->pw_shell, 1);
if (term[0] == '\0')
strncpy(term, stypeof(tty), sizeof(term));
(void)setenv("TERM", term, 0);
(void)setenv("USER", pwd->pw_name, 1);
(void)setenv("PATH", _PATH_DEFPATH, 0);
#else
(void)setenv("HOME", pwd->pw_dir, 0); /* legal to override */
if(pwd->pw_uid)
(void)setenv("PATH", _PATH_DEFPATH, 1);
else
(void)setenv("PATH", _PATH_DEFPATH_ROOT, 1);
(void)setenv("SHELL", pwd->pw_shell, 1);
(void)setenv("TERM", termenv, 1);
/* mailx will give a funny error msg if you forget this one */
(void)sprintf(tmp,"%s/%s",_PATH_MAILDIR,pwd->pw_name);
(void)setenv("MAIL",tmp,0);
/* LOGNAME is not documented in login(1) but
HP-UX 6.5 does it. We'll not allow modifying it.
*/
(void)setenv("LOGNAME", pwd->pw_name, 1);
#endif
#ifndef linux
if (tty[sizeof("tty")-1] == 'd')
syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name);
#endif
if (pwd->pw_uid == 0)
if (hostname)
syslog(LOG_NOTICE, "ROOT LOGIN ON %s FROM %s",
tty, hostname);
else
syslog(LOG_NOTICE, "ROOT LOGIN ON %s", tty);
if (!quietlog) {
struct stat st;
motd();
(void)sprintf(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 " : "");
}
(void)signal(SIGALRM, SIG_DFL);
(void)signal(SIGQUIT, SIG_DFL);
(void)signal(SIGINT, SIG_DFL);
(void)signal(SIGTSTP, SIG_IGN);
(void)signal(SIGHUP, SIG_DFL);
/* discard permissions last so can't get killed and drop core */
if(setuid(pwd->pw_uid) < 0 && pwd->pw_uid) {
syslog(LOG_ALERT, "setuid() failed");
exit(1);
}
/* wait until here to change directory! */
if (chdir(pwd->pw_dir) < 0) {
(void)printf("No directory %s!\n", pwd->pw_dir);
if (chdir("/"))
exit(0);
pwd->pw_dir = "/";
(void)printf("Logging in with home = \"/\".\n");
}
/* if the shell field has a space: treat it like a shell script */
if (strchr(pwd->pw_shell, ' ')) {
char *buff = malloc(strlen(pwd->pw_shell) + 6);
if (buff) {
strcpy(buff, "exec ");
strcat(buff, pwd->pw_shell);
execlp("/bin/sh", "-sh", "-c", buff, (char *)0);
fprintf(stderr, "login: couldn't exec shell script: %s.\n",
strerror(errno));
exit(0);
}
fprintf(stderr, "login: no memory for shell script.\n");
exit(0);
}
tbuf[0] = '-';
strcpy(tbuf + 1, ((p = rindex(pwd->pw_shell, '/')) ?
p + 1 : pwd->pw_shell));
execlp(pwd->pw_shell, tbuf, (char *)0);
(void)fprintf(stderr, "login: no shell: %s.\n", strerror(errno));
exit(0);
}
void
getloginname()
{
register int ch;
register char *p;
static char nbuf[UT_NAMESIZE + 1];
for (;;) {
(void)printf("\n%s login: ", thishost); fflush(stdout);
for (p = nbuf; (ch = getchar()) != '\n'; ) {
if (ch == EOF) {
badlogin(username);
exit(0);
}
if (p < nbuf + UT_NAMESIZE)
*p++ = ch;
}
if (p > nbuf)
if (nbuf[0] == '-')
(void)fprintf(stderr,
"login names may not start with '-'.\n");
else {
*p = '\0';
username = nbuf;
break;
}
}
}
void timedout()
{
struct termio ti;
(void)fprintf(stderr, "Login timed out after %d seconds\n", timeout);
/* reset echo */
(void) ioctl(0, TCGETA, &ti);
ti.c_lflag |= ECHO;
(void) ioctl(0, TCSETA, &ti);
exit(0);
}
int
rootterm(ttyn)
char *ttyn;
#ifndef linux
{
struct ttyent *t;
return((t = getttynam(ttyn)) && t->ty_status&TTY_SECURE);
}
#else
{
int fd;
char buf[100],*p;
int cnt, more;
fd = open(SECURETTY, O_RDONLY);
if(fd < 0) return 1;
/* read each line in /etc/securetty, if a line matches our ttyline
then root is allowed to login on this tty, and we should return
true. */
for(;;) {
p = buf; cnt = 100;
while(--cnt >= 0 && (more = read(fd, p, 1)) == 1 && *p != '\n') p++;
if(more && *p == '\n') {
*p = '\0';
if(!strcmp(buf, ttyn)) {
close(fd);
return 1;
} else
continue;
} else {
close(fd);
return 0;
}
}
}
#endif
jmp_buf motdinterrupt;
void
motd()
{
register int fd, nchars;
void (*oldint)(), sigint();
char tbuf[8192];
if ((fd = open(_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);
}
void sigint()
{
longjmp(motdinterrupt, 1);
}
void
checknologin()
{
register int fd, nchars;
char tbuf[8192];
if ((fd = open(_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), L_SET);
if (!quiet) {
if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) &&
ll.ll_time != 0) {
(void)printf("Last login: %.*s ",
24-5, (char *)ctime(&ll.ll_time));
if (*ll.ll_host != '\0')
printf("from %.*s\n",
(int)sizeof(ll.ll_host), ll.ll_host);
else
printf("on %.*s\n",
(int)sizeof(ll.ll_line), ll.ll_line);
}
(void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET);
}
memset((char *)&ll, 0, sizeof(ll));
(void)time(&ll.ll_time);
strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
if (hostname)
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, %s",
failures, failures > 1 ? "S" : "", hostname, name);
else
syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s, %s",
failures, failures > 1 ? "S" : "", tty, name);
}
#undef UNKNOWN
#define UNKNOWN "su"
#ifndef linux
char *
stypeof(ttyid)
char *ttyid;
{
struct ttyent *t;
return(ttyid && (t = getttynam(ttyid)) ? t->ty_type : UNKNOWN);
}
#endif
void
checktty(user, tty)
char *user;
char *tty;
{
FILE *f;
char buf[256];
char *ptr;
char devname[50];
struct stat stb;
/* no /etc/usertty, default to allow access */
if(!(f = fopen(_PATH_USERTTY, "r"))) return;
while(fgets(buf, 255, f)) {
/* strip comments */
for(ptr = buf; ptr < buf + 256; ptr++)
if(*ptr == '#') *ptr = 0;
strtok(buf, " \t");
if(strncmp(user, buf, 8) == 0) {
while((ptr = strtok(NULL, "\t\n "))) {
if(strncmp(tty, ptr, 10) == 0) {
fclose(f);
return;
}
if(strcmp("PTY", ptr) == 0) {
#ifdef linux
sprintf(devname, "/dev/%s", ptr);
/* VERY linux dependent, recognize PTY as alias
for all pseudo tty's */
if((stat(devname, &stb) >= 0)
&& major(stb.st_rdev) == 4
&& minor(stb.st_rdev) >= 192) {
fclose(f);
return;
}
#endif
}
}
/* if we get here, /etc/usertty exists, there's a line
beginning with our username, but it doesn't contain the
name of the tty where the user is trying to log in.
So deny access! */
fclose(f);
printf("Login on %s denied.\n", tty);
badlogin(user);
sleepexit(1);
}
}
fclose(f);
/* users not mentioned in /etc/usertty are by default allowed access
on all tty's */
}
void
getstr(buf, cnt, err)
char *buf, *err;
int cnt;
{
char ch;
do {
if (read(0, &ch, sizeof(ch)) != sizeof(ch))
exit(1);
if (--cnt < 0) {
(void)fprintf(stderr, "%s too long\r\n", err);
sleepexit(1);
}
*buf++ = ch;
} while (ch);
}
void
sleepexit(eval)
int eval;
{
sleep((unsigned int)5);
exit(eval);
}