Ultrix-3.1/src/cmd/login.c
/**********************************************************************
* Copyright (c) Digital Equipment Corporation 1984, 1985, 1986. *
* All Rights Reserved. *
* Reference "/usr/src/COPYRIGHT" for applicable restrictions. *
**********************************************************************/
/*
* login [ name ]
*
* Modified to use DEC tty control characters,
* ^U & delete.
*
* Fred Canter 9/29/82
*/
static char Sccsid[] = "@(#)login.c 3.1 10/12/87";
#include <sys/types.h>
#include <sgtty.h>
#include <utmp.h>
#include <signal.h>
#include <pwd.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/param.h>
#define PATH "PATH=:/usr/ucb:/bin:/usr/bin"
#define JCLCSH "/bin/csh" /* job control shell, needs new line disc. */
#define UMASK 002
#define SCPYN(a, b) strncpy(a, b, sizeof(a))
#define NMAX sizeof(utmp.ut_name)
#define FALSE 0
#define TRUE -1
#define CNTL(x) ('x'&037)
#define UNDEF '\0377'
char maildir[30] = "/usr/spool/mail/";
char qlog[] = ".hushlogin";
struct passwd nouser = {"", "nope"};
struct sgttyb ttyb;
struct utmp utmp;
char minusnam[16] = "-";
/*
* This bounds the time given to login. We initialize it here
* so it can be patched on machines where it's too small.
*/
int timeout = 60;
char homedir[64] = "HOME=";
char term[64] = "TERM=";
char shell[64] = "SHELL=";
char user[NMAX+9] = "USER=";
char *envinit[] = {homedir, PATH, term, shell, user, 0};
struct passwd *pwd;
char *ttyn;
struct passwd *getpwnam();
char *strcat();
int setpwent();
int timedout();
char *ttyname();
char *crypt();
char *getpass();
char *rindex(), *index();
extern char **environ;
#define FSTTY
#ifdef FSTTY
#define ERASE 0177
#define KILL CNTL(U)
#else
#define ERASE '#'
#define KILL '@'
#endif FSTTY
#define EOT CNTL(d)
struct tchars tc = {
CNTL(c), CNTL(\\), CNTL(q), CNTL(s), CNTL(d), CBRK, CMIN, CTIME
};
struct ltchars ltc = {
CNTL(z), CNTL(y), CNTL(r), CNTL(o), CNTL(w), CNTL(v), UNDEF, UNDEF
};
int intrflg;
int rflag;
char rusername[NMAX+1], lusername[NMAX+1];
char rpassword[NMAX+1];
char name[NMAX+1];
char *rhost;
#ifdef NEWLIMITS
unsigned sumcheck = 0;
#endif NEWLIMITS
main(argc, argv)
char **argv;
{
register char *namep;
int pflag = 0;
int t, f, c;
int csole, slowt;
int tflg;
int ldisc, zero = 0;
int invalid;
int quietlog;
signal(SIGALRM, timedout);
alarm(timeout);
signal(SIGQUIT, SIG_IGN);
signal(SIGINT, SIG_IGN);
nice(-100);
nice(20);
nice(0);
/*
* -p is used by getty to tell login not to destroy the environment
* -r is used by rlogind to cause the autologin protocol;
* -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
*/
if (argc > 1) {
if (strcmp(argv[1], "-r") == 0) {
rflag = dormtlogin(argv[2]);
SCPYN(utmp.ut_host, argv[2]);
argc = 0;
}
if (strcmp(argv[1], "-h") == 0 && getuid() == 0) {
SCPYN(utmp.ut_host, argv[2]);
argc = 0;
}
if (strcmp(argv[1], "-p") == 0) {
argv++;
pflag = 1;
argc -= 1;
}
}
if (rflag)
ioctl(0, TIOCLSET, &zero);
ioctl(0, TIOCNXCL, 0);
ioctl(0, FIONBIO, &zero);
ioctl(0, FIOASYNC, &zero);
ioctl(0, TIOCGETP, &ttyb);
ttyb.sg_erase = ERASE;
ttyb.sg_kill = KILL;
/*
* If talking to an rlogin process,
* propagate the terminal type and
* baud rate across the network.
*/
if (rflag) {
doremoteterm(term, &ttyb);
ioctl(0, TIOCSLTC, <c);
ioctl(0, TIOCSETC, &tc);
}
ioctl(0, TIOCSETP, &ttyb);
for (t=3; t< NOFILE; t++)
close(t);
ttyn = ttyname(0);
if (ttyn==0)
ttyn = "/dev/tty??";
t = 0;
do {
ldisc = NTTYDISC;
ioctl(0, TIOCSETD, &ldisc);
invalid = FALSE;
SCPYN(utmp.ut_name, "");
/*
* Name specified, take it.
*/
if (argc > 1) {
SCPYN(utmp.ut_name, argv[1]);
argc = 0;
}
/*
* If remote login take given name,
* otherwise prompt user for something.
*/
if (rflag) {
SCPYN(utmp.ut_name, lusername);
/* autologin failed, prompt for passwd */
if (rflag == -1)
rflag = 0;
} else
getloginname(&utmp);
/*
* If no remote login authentication and
* a password exists for this user, prompt
* for one and verify it.
*/
if (!rflag && *pwd->pw_passwd != '\0') {
char *pp;
pp = getpass("Password:");
namep = crypt(pp, pwd->pw_passwd);
if (strcmp(namep, pwd->pw_passwd))
invalid = TRUE;
}
/*
* shutdown in progress ?
* If user not super-user, check for logins disabled.
*/
if(access("/etc/sdloglock", 0) == 0 ||
access("/etc/loglock",0) == 0 && pwd->pw_gid != 1 &&
pwd->pw_uid != 0)
{
printf("No Logins\n");
exit(0);
}
if (invalid) {
printf("Login incorrect\n");
if (++t >= 5) {
ioctl(0, TIOCHPCL, (struct sgttyb *) 0);
close(0);
close(1);
close(2);
sleep(10);
exit(1);
}
}
#ifdef NEWLIMITS
else if (lim(0) < 0) {
printf("\nUser login limit exceeded,\n");
printf("please try again later!\n");
exit(0);
}
#endif NEWLIMITS
if (*pwd->pw_shell == '\0')
pwd->pw_shell = "/bin/sh";
if (!strcmp(pwd->pw_shell, JCLCSH)) {
ldisc = NTTYDISC;
ioctl(0, TIOCSETD, &ldisc);
} else {
ltc.t_suspc = ltc.t_dsuspc = UNDEF;
ioctl(0, TIOCSLTC, <c);
}
if (chdir(pwd->pw_dir) < 0 && !invalid ) {
if (chdir("/") < 0) {
printf("No directory!\n");
invalid = TRUE;
} else {
printf("No directory! %s\n",
"Logging in with home=/");
pwd->pw_dir = "/";
}
}
/*
* Remote login invalid must have been because
* of a restriction of some sort, no extra chances.
*/
if (rflag && invalid)
exit(1);
} while (invalid);
time(&utmp.ut_time);
t = ttyslot();
if (t>0 && (f = open(UTMP_FILE, 1)) >= 0) {
lseek(f, (long)(t*sizeof(utmp)), 0);
SCPYN(utmp.ut_line, index(ttyn+1, '/')+1);
write(f, (char *)&utmp, sizeof(utmp));
close(f);
}
if (t>0 && (f = open(WTMP_FILE, 1)) >= 0) {
lseek(f, 0L, 2);
write(f, (char *)&utmp, sizeof(utmp));
close(f);
}
chown(ttyn, pwd->pw_uid, pwd->pw_gid);
setgid(pwd->pw_gid);
setuid(pwd->pw_uid);
if (!term[5])
getterm();
environ = envinit;
strncat(homedir, pwd->pw_dir, sizeof(homedir)-6);
strncat(user, pwd->pw_name, sizeof(user)-6);
if ((namep = rindex(pwd->pw_shell, '/')) == NULL)
namep = pwd->pw_shell;
else
namep++;
strncat(shell, pwd->pw_shell, sizeof(shell)-7);
strcat(minusnam, namep);
alarm(0);
umask(UMASK);
quietlog = (access(qlog,0) == 0);
if (!quietlog)
showmotd();
if(access("/etc/loglock",0) == 0)
printf("LOGINS DISABLED\n");
strcat(maildir, pwd->pw_name);
if(!quietlog && (access(maildir,4)==0)) {
struct stat statb;
stat(maildir, &statb);
if (statb.st_size)
printf("You have mail.\n");
}
signal(SIGQUIT, SIG_DFL);
signal(SIGINT, SIG_DFL);
#ifdef SIGTSTP
signal(SIGTSTP, SIG_IGN);
#endif
execlp(pwd->pw_shell, minusnam, 0);
printf("No shell\n");
exit(0);
}
getloginname(up)
register struct utmp *up;
{
register char *namep;
char c;
int logint();
intrflg = 0;
signal(SIGINT,logint);
while (up->ut_name[0] == '\0') {
namep = up->ut_name;
printf("login: ");
while ((c = getchar()) != '\n') {
if (intrflg) {
intrflg = 0;
printf("\n");
break;
}
if (c == ' ')
c = '_';
if (c == EOF)
exit(0);
if (namep < up->ut_name+NMAX)
*namep++ = c;
}
}
strncpy(lusername, up->ut_name, NMAX);
lusername[NMAX] = 0;
signal(SIGINT,SIG_IGN);
setpwent();
if ((pwd = getpwnam(lusername)) == NULL)
pwd = &nouser;
endpwent();
}
logint()
{
int logint(); signal(SIGINT, logint);
intrflg++;
}
timedout()
{
printf("\nLogin timed out after %d seconds\n", timeout);
exit(0);
}
int stopmotd;
catch()
{
signal(SIGINT, SIG_IGN);
stopmotd++;
}
showmotd()
{
FILE *mf;
register c;
signal(SIGINT, catch);
if((mf = fopen("/etc/motd","r")) != NULL) {
while((c = getc(mf)) != EOF && stopmotd == 0)
putchar(c);
fclose(mf);
}
signal(SIGINT, SIG_IGN);
}
/*
* doremotelogin
*/
dormtlogin(host)
char *host;
{
FILE *hostf;
int first = 1;
char temp_term[64];
getstr(rusername, sizeof (rusername), "remuser");
getstr(lusername, sizeof (lusername), "locuser");
getstr(temp_term, sizeof(temp_term), "Terminal type");
strcat(term,temp_term);
if (getuid()) {
pwd = &nouser;
goto bad;
}
pwd = getpwnam(lusername);
if (pwd == NULL) {
pwd = &nouser;
goto bad;
}
hostf = pwd->pw_uid ? fopen("/etc/hosts.equiv", "r") : 0;
again:
if (hostf) {
char ahost[32];
while (fgets(ahost, sizeof (ahost), hostf)) {
char *user;
if ((user = index(ahost, '\n')) != 0)
*user++ = '\0';
if ((user = index(ahost, ' ')) != 0)
*user++ = '\0';
if (!strcmp(host, ahost) &&
!strcmp(rusername, user ? user : lusername)) {
fclose(hostf);
return (1);
}
}
fclose(hostf);
}
if (first == 1) {
char *rhosts = ".rhosts";
struct stat sbuf;
first = 0;
if (chdir(pwd->pw_dir) < 0)
goto again;
if (stat(rhosts, &sbuf) < 0)
goto again;
hostf = fopen(rhosts, "r");
fstat(fileno(hostf), &sbuf);
if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid) {
printf("login: Bad .rhosts ownership.\r\n");
fclose(hostf);
goto bad;
}
goto again;
}
bad:
return (-1);
}
getstr(buf, cnt, err)
char *buf;
int cnt;
char *err;
{
char c;
do {
if (read(0, &c, 1) != 1)
exit(1);
if (--cnt < 0) {
printf("%s too long\r\n", err);
exit(1);
}
*buf++ = c;
} while (c != 0);
}
char *speeds[] =
{ "0", "50", "75", "110", "134", "150", "200", "300",
"600", "1200", "1800", "2400", "4800", "9600", "19200", "38400" };
#define NSPEEDS (sizeof (speeds) / sizeof (speeds[0]))
doremoteterm(term, tp)
char *term;
struct sgttyb *tp;
{
char *cp = index(term, '/');
register int i;
if (cp) {
*cp++ = 0;
for (i = 0; i < NSPEEDS; i++)
if (!strcmp(speeds[i], cp)) {
tp->sg_ispeed = tp->sg_ospeed = i;
break;
}
}
tp->sg_flags = ECHO|CRMOD|ANYP|XTABS;
}
/*
* make a reasonable guess as to the kind of terminal the user is on.
* We look in /etc/ttytype for this info (format: each line has two
* words, first word is a term type, second is a tty name), and default
* to "unknown" if we can't find any better. In the case of dialups we get
* names like "dialup" which is a lousy guess but tset can
* take it from there.
*/
getterm()
{
register char *sp, *tname;
register int i;
register FILE *fdes;
char *type, *t;
char ttline[64];
if ((fdes = fopen("/etc/ttytype", "r")) == NULL) {
unknown:
strcat(term, "unknown");
fclose(fdes);
return;
}
for (tname = ttyn; *tname++; )
;
while (*--tname != '/')
;
tname++;
while (fgets(ttline, sizeof(ttline), fdes) != NULL) {
ttline[strlen(ttline)-1] = 0; /* zap \n on end */
type = ttline;
for (t=ttline; *t && *t!=' ' && *t != '\t'; t++)
;
*t++ = 0;
/* Now have term and type pointing to the right guys */
if (strcmp(t, tname) == 0) {
strcat(term, type);
fclose(fdes);
return;
}
}
goto unknown;
}