static char *sccsid = "@(#)login.c.1 4.34 (Berkeley) 84/05/07";
* login -r hostname (for rlogind)
* login -h hostname (for telnetd, etc.)
#include <sys/resource.h>
#define SCMPN(a, b) strncmp(a, b, sizeof(a))
#define SCPYN(a, b) strncpy(a, b, sizeof(a))
#define NMAX sizeof(utmp.ut_name)
char nolog[] = "/etc/nologin";
char qlog[] = ".hushlogin";
char maildir[30] = "/usr/spool/mail/";
char lastlog[] = "/usr/adm/lastlog";
struct passwd nouser = {"", "nope", -1, -1, -1, "", "", "", "" };
* This bounds the time given to login. We initialize it here
* so it can be patched on machines where it's too small.
char homedir[64] = "HOME=";
char shell[64] = "SHELL=";
{ homedir, shell, "PATH=:/usr/ucb:/bin:/usr/bin", term, user, 0 };
char *strcat(), *rindex(), *index();
CINTR, CQUIT, CSTART, CSTOP, CEOT, CBRK
CSUSP, CDSUSP, CRPRNT, CFLUSH, CWERASE, CLNEXT
char rusername[NMAX+1], lusername[NMAX+1];
signal(SIGALRM, timedout);
signal(SIGQUIT, SIG_IGN);
setpriority(PRIO_PROCESS, 0, 0);
quota(Q_SETUID, 0, 0, 0);
* -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 (strcmp(argv[1], "-r") == 0) {
rflag = doremotelogin(argv[2]);
SCPYN(utmp.ut_host, argv[2]);
if (strcmp(argv[1], "-h") == 0 && getuid() == 0) {
SCPYN(utmp.ut_host, argv[2]);
ioctl(0, TIOCLSET, &zero);
ioctl(0, FIONBIO, &zero);
ioctl(0, FIOASYNC, &zero);
ioctl(0, TIOCGETP, &ttyb);
* If talking to an rlogin process,
* propagate the terminal type and
* baud rate across the network.
doremoteterm(term, &ttyb);
ioctl(0, TIOCSLTC, <c);
ioctl(0, TIOCSETP, &ttyb);
for (t = getdtablesize(); t > 3; t--)
ioctl(0, TIOCSETD, &ldisc);
* Name specified, take it.
SCPYN(utmp.ut_name, argv[1]);
* If remote login take given name,
* otherwise prompt user for something.
SCPYN(utmp.ut_name, lusername);
/* autologin failed, prompt for passwd */
if (!strcmp(pwd->pw_shell, "/bin/csh")) {
ioctl(0, TIOCSETD, &ldisc);
* If no remote login authentication and
* a password exists for this user, prompt
if (!rflag && *pwd->pw_passwd != '\0') {
setpriority(PRIO_PROCESS, 0, -4);
pp = getpass("Password:");
namep = crypt(pp, pwd->pw_passwd);
setpriority(PRIO_PROCESS, 0, 0);
if (strcmp(namep, pwd->pw_passwd))
* If user not super-user, check for logins disabled.
if (pwd->pw_uid != 0 && (nlfd = fopen(nolog, "r")) > 0) {
while ((c = getc(nlfd)) != EOF)
* If valid so far and root is logging in,
* see if root logins on this terminal are permitted.
if (!invalid && pwd->pw_uid == 0 && !rootterm(tty)) {
syslog(LOG_INFO, "ROOT LOGIN REFUSED %s", tty);
printf("Login incorrect\n");
"REPEATED LOGIN FAILURES %s, %s",
ioctl(0, TIOCHPCL, (struct sgttyb *) 0);
if (*pwd->pw_shell == '\0')
pwd->pw_shell = "/bin/sh";
if (chdir(pwd->pw_dir) < 0 && !invalid ) {
printf("No directory!\n");
printf("No directory! %s\n",
"Logging in with home=/");
* Remote login invalid must have been because
* of a restriction of some sort, no extra chances.
/* committed to login turn off timeout */
if (quota(Q_SETUID, pwd->pw_uid, 0, 0) < 0) {
"Too many users logged on already",
else if (errno == EPROCLIM)
printf("You have too many processes running.\n");
if (t > 0 && (f = open("/etc/utmp", O_WRONLY)) >= 0) {
lseek(f, (long)(t*sizeof(utmp)), 0);
SCPYN(utmp.ut_line, tty);
write(f, (char *)&utmp, sizeof(utmp));
if ((f = open("/usr/adm/wtmp", O_WRONLY|O_APPEND)) >= 0) {
write(f, (char *)&utmp, sizeof(utmp));
quietlog = access(qlog, F_OK) == 0;
if ((f = open(lastlog, O_RDWR)) >= 0) {
lseek(f, (long)pwd->pw_uid * sizeof (struct lastlog), 0);
if (read(f, (char *) &ll, sizeof ll) == sizeof ll &&
ll.ll_time != 0 && !quietlog) {
printf("Last login: %.*s ",
24-5, (char *)ctime(&ll.ll_time));
sizeof (ll.ll_host), ll.ll_host);
sizeof (ll.ll_line), ll.ll_line);
lseek(f, (long)pwd->pw_uid * sizeof (struct lastlog), 0);
SCPYN(ll.ll_host, utmp.ut_host);
write(f, (char *) &ll, sizeof ll);
chown(ttyn, pwd->pw_uid, pwd->pw_gid);
strncpy(name, utmp.ut_name, NMAX);
initgroups(name, pwd->pw_gid);
quota(Q_DOWARN, pwd->pw_uid, (dev_t)-1, 0);
strncat(homedir, pwd->pw_dir, sizeof(homedir)-6);
strncat(shell, pwd->pw_shell, sizeof(shell)-7);
if (term[strlen("TERM=")] == 0)
strncat(term, stypeof(tty), sizeof(term)-6);
strncat(user, pwd->pw_name, sizeof(user)-6);
if ((namep = rindex(pwd->pw_shell, '/')) == NULL)
if (tty[sizeof("tty")-1] == 'd')
syslog(LOG_INFO, "DIALUP %s %s", tty, pwd->pw_name);
strcat(maildir, pwd->pw_name);
if (access(maildir, R_OK) == 0) {
printf("You have mail.\n");
signal(SIGALRM, SIG_DFL);
signal(SIGQUIT, SIG_DFL);
signal(SIGTSTP, SIG_IGN);
execlp(pwd->pw_shell, minusnam, 0);
register struct utmp *up;
while (up->ut_name[0] == '\0') {
while ((c = getchar()) != '\n') {
if (namep < up->ut_name+NMAX)
strncpy(lusername, up->ut_name, NMAX);
if ((pwd = getpwnam(lusername)) == NULL)
printf("Login timed out after %d seconds\n", timeout);
register struct ttyent *t;
if ((t = getttynam(tty)) != NULL) {
if (t->ty_status & TTY_SECURE)
if ((mf = fopen("/etc/motd", "r")) != NULL) {
while ((c = getc(mf)) != EOF && stopmotd == 0)
register struct ttyent *t;
if (ttyid == NULL || (t = getttynam(ttyid)) == NULL)
getstr(rusername, sizeof (rusername), "remuser");
getstr(lusername, sizeof (lusername), "locuser");
getstr(term+5, sizeof(term)-5, "Terminal type");
pwd = getpwnam(lusername);
hostf = pwd->pw_uid ? fopen("/etc/hosts.equiv", "r") : 0;
while (fgets(ahost, sizeof (ahost), hostf)) {
if ((user = index(ahost, '\n')) != 0)
if ((user = index(ahost, ' ')) != 0)
if (!strcmp(host, ahost) &&
!strcmp(rusername, user ? user : lusername)) {
char *rhosts = ".rhosts";
if (chdir(pwd->pw_dir) < 0)
if (lstat(rhosts, &sbuf) < 0)
if ((sbuf.st_mode & S_IFMT) == S_IFLNK) {
printf("login: .rhosts is a soft link.\r\n");
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");
printf("%s too long\r\n", err);
{ "0", "50", "75", "110", "134", "150", "200", "300",
"600", "1200", "1800", "2400", "4800", "9600", "19200", "38400" };
#define NSPEEDS (sizeof (speeds) / sizeof (speeds[0]))
char *cp = index(term, '/');
for (i = 0; i < NSPEEDS; i++)
if (!strcmp(speeds[i], cp)) {
tp->sg_ispeed = tp->sg_ospeed = i;
tp->sg_flags = ECHO|CRMOD|ANYP|XTABS;