#endif /* not lint */
#ifndef lint
-static char sccsid[] = "@(#)login.c 5.35 (Berkeley) %G%";
+static char sccsid[] = "@(#)login.c 5.52 (Berkeley) %G%";
#endif /* not lint */
/*
* login [ name ]
+ * login -r hostname (for rlogind)
* login -h hostname (for telnetd, etc.)
* login -f name (for pre-authenticated login: datakit, xterm, etc.)
*/
#include <sys/param.h>
-#include <sys/quota.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/file.h>
-#include <sys/ioctl.h>
+#include <sgtty.h>
#include <utmp.h>
#include <signal.h>
-#include <lastlog.h>
#include <errno.h>
#include <ttyent.h>
#include <syslog.h>
#include <setjmp.h>
#include <stdio.h>
#include <strings.h>
+#include <tzfile.h>
#include "pathnames.h"
#define TTYGRPNAME "tty" /* name of group to own ttys */
struct passwd *pwd;
int failures;
-char term[64], *hostname, *username, *tty;
+char term[64], *envinit[1], *hostname, *username, *tty;
struct sgttyb sgttyb;
struct tchars tc = {
struct group *gr;
register int ch;
register char *p;
- int ask, fflag, hflag, pflag, cnt;
+ int ask, fflag, hflag, pflag, rflag, cnt;
int quietlog, passwd_req, ioctlval, timedout();
- char *domain, *salt, *envinit[1], *ttyn, *pp;
- char tbuf[MAXPATHLEN + 2];
+ char *domain, *salt, *ttyn, *pp;
+ char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10];
+ char localhost[MAXHOSTNAMELEN];
char *ctime(), *ttyname(), *stypeof(), *crypt(), *getpass();
time_t time();
off_t lseek();
(void)signal(SIGQUIT, SIG_IGN);
(void)signal(SIGINT, SIG_IGN);
(void)setpriority(PRIO_PROCESS, 0, 0);
- (void)quota(Q_SETUID, 0, 0, 0);
/*
* -p is used by getty to tell login not to destroy the environment
+ * -r is used by rlogind to cause the autologin protocol;
* -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));
- domain = index(tbuf, '.');
+ domain = NULL;
+ if (gethostname(localhost, sizeof(localhost)) < 0)
+ syslog(LOG_ERR, "couldn't get local hostname: %m");
+ else
+ domain = index(localhost, '.');
+
+ openlog("login", LOG_ODELAY, LOG_AUTH);
- fflag = hflag = pflag = 0;
+ fflag = hflag = pflag = rflag = 0;
passwd_req = 1;
- while ((ch = getopt(argc, argv, "fh:p")) != EOF)
+ uid = getuid();
+ while ((ch = getopt(argc, argv, "fh:pr:")) != EOF)
switch (ch) {
case 'f':
+ if (rflag) {
+ fprintf(stderr,
+ "login: only one of -r and -f allowed.\n");
+ exit(1);
+ }
fflag = 1;
break;
case 'h':
- if (getuid()) {
- fprintf(stderr,
+ if (uid) {
+ (void)fprintf(stderr,
"login: -h for super-user only.\n");
exit(1);
}
+ if (rflag) {
+ fprintf(stderr,
+ "login: only one of -r and -h allowed.\n");
+ exit(1);
+ }
hflag = 1;
if (domain && (p = index(optarg, '.')) &&
strcasecmp(p, domain) == 0)
case 'p':
pflag = 1;
break;
+ case 'r':
+ if (hflag || fflag) {
+ fprintf(stderr,
+ "login: -f and -h not allowed with -r.\n");
+ exit(1);
+ }
+ if (getuid()) {
+ fprintf(stderr,
+ "login: -r for super-user only.\n");
+ exit(1);
+ }
+ /* "-r hostname" must be last args */
+ if (optind != argc) {
+ fprintf(stderr, "Syntax error.\n");
+ exit(1);
+ }
+ rflag = 1;
+ passwd_req = (doremotelogin(optarg) == -1);
+ if (domain && (p = index(optarg, '.')) &&
+ !strcmp(p, domain))
+ *p = '\0';
+ hostname = optarg;
+ break;
case '?':
default:
- fprintf(stderr, "usage: login [-fp] [username]\n");
+ if (!uid)
+ syslog(LOG_ERR, "invalid flag %c", ch);
+ (void)fprintf(stderr,
+ "usage: login [-fp] [username]\n");
exit(1);
}
argc -= optind;
ask = 0;
} else
ask = 1;
+ if (rflag)
+ ask = 0;
ioctlval = 0;
(void)ioctl(0, TIOCLSET, &ioctlval);
(void)ioctl(0, TIOCNXCL, 0);
(void)fcntl(0, F_SETFL, ioctlval);
(void)ioctl(0, TIOCGETP, &sgttyb);
+
+ /*
+ * If talking to an rlogin process, propagate the terminal type and
+ * baud rate across the network.
+ */
+ if (rflag)
+ doremoteterm(&sgttyb);
sgttyb.sg_erase = CERASE;
sgttyb.sg_kill = CKILL;
(void)ioctl(0, TIOCSLTC, <c);
close(cnt);
ttyn = ttyname(0);
- if (ttyn == NULL || *ttyn == '\0')
- ttyn = "/dev/tty??";
+ if (ttyn == NULL || *ttyn == '\0') {
+ (void)sprintf(tname, "%s??", _PATH_TTY);
+ ttyn = tname;
+ }
if (tty = rindex(ttyn, '/'))
++tty;
else
tty = ttyn;
- openlog("login", LOG_ODELAY, LOG_AUTH);
-
for (cnt = 0;; ask = 1) {
- ioctlval = 0;
+ ioctlval = TTYDISC;
(void)ioctl(0, TIOCSETD, &ioctlval);
if (ask) {
getloginname();
}
/*
- * Note if trying multiple user names;
- * log failures for previous user name,
- * but don't bother logging one failure
+ * 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)) {
* root, disallow if the uid's differ.
*/
if (fflag && pwd) {
- int uid = getuid();
-
- passwd_req = pwd->pw_uid == 0 ||
+ passwd_req =
+#ifndef KERBEROS
+ pwd->pw_uid == 0 ||
+#endif
(uid && uid != pwd->pw_uid);
}
if (!passwd_req || (pwd && !*pwd->pw_passwd))
break;
+ /*
+ * If trying to log in as root, but with insecure terminal,
+ * refuse the login attempt.
+ */
+ if (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;
+ }
+
setpriority(PRIO_PROCESS, 0, -4);
pp = getpass("Password:");
p = crypt(pp, salt);
if (pwd && !strcmp(p, pwd->pw_passwd))
break;
- printf("Login incorrect\n");
+ (void)printf("Login incorrect\n");
failures++;
/* we allow 10 tries, but after 3 we start backing off */
if (++cnt > 3) {
/* committed to login -- turn off timeout */
(void)alarm((u_int)0);
- /*
- * If valid so far and root is logging in, see if root logins on
- * this terminal are permitted.
- */
- if (pwd->pw_uid == 0 && !rootterm(tty)) {
- if (hostname)
- syslog(LOG_NOTICE, "ROOT LOGIN REFUSED FROM %s",
- hostname);
- else
- syslog(LOG_NOTICE, "ROOT LOGIN REFUSED ON %s", tty);
- printf("Login incorrect\n");
- sleepexit(1);
- }
-
- if (quota(Q_SETUID, pwd->pw_uid, 0, 0) < 0 && errno != EINVAL) {
- switch(errno) {
- case EUSERS:
- fprintf(stderr,
- "Too many users logged on already.\nTry again later.\n");
- break;
- case EPROCLIM:
- fprintf(stderr,
- "You have too many processes running.\n");
- break;
- default:
- perror("quota (Q_SETUID)");
- }
- sleepexit(0);
- }
+ /* paranoia... */
+ endpwent();
if (chdir(pwd->pw_dir) < 0) {
- printf("No directory %s!\n", pwd->pw_dir);
+ (void)printf("No directory %s!\n", pwd->pw_dir);
if (chdir("/"))
exit(0);
pwd->pw_dir = "/";
- printf("Logging in with home = \"/\".\n");
+ (void)printf("Logging in with home = \"/\".\n");
}
#define TWOWEEKS (14*24*60*60)
months[ttp->tm_mon], ttp->tm_mday, ttp->tm_year);
}
-#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) {
- printf("Sorry -- your password has expired.\n");
+ (void)printf("Sorry -- your password has expired.\n");
sleepexit(1);
}
- else if (tp.tv_sec - pwd->pw_change < TWOWEEKS) {
+ else if (pwd->pw_change - tp.tv_sec <
+ 2 * DAYSPERWEEK * SECSPERDAY && !quietlog) {
ttp = localtime(&pwd->pw_change);
- printf("Warning: your password expires on %s %d, 19%d\n",
- months[ttp->tm_mon], ttp->tm_mday, ttp->tm_year);
+ (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) {
- printf("Sorry -- your account has expired.\n");
+ (void)printf("Sorry -- your account has expired.\n");
sleepexit(1);
}
- else if (tp.tv_sec - pwd->pw_expire < TWOWEEKS) {
+ else if (pwd->pw_expire - tp.tv_sec <
+ 2 * DAYSPERWEEK * SECSPERDAY && !quietlog) {
ttp = localtime(&pwd->pw_expire);
- printf("Warning: your account expires on %s %d, 19%d\n",
- months[ttp->tm_mon], ttp->tm_mday, ttp->tm_year);
+ (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 */
login(&utmp);
}
- quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0;
dolastlog(quietlog);
- if (!hflag) { /* XXX */
+ if (!hflag && !rflag) { /* XXX */
static struct winsize win = { 0, 0, 0, 0 };
(void)ioctl(0, TIOCSWINSZ, &win);
initgroups(username, pwd->pw_gid);
- quota(Q_DOWARN, pwd->pw_uid, (dev_t)-1, 0);
- (void)setuid(pwd->pw_uid);
-
if (*pwd->pw_shell == '\0')
pwd->pw_shell = _PATH_BSHELL;
- /* turn on new line discipline for the csh */
- else if (!strcmp(pwd->pw_shell, "/bin/csh")) {
- ioctlval = NTTYDISC;
- (void)ioctl(0, TIOCSETD, &ioctlval);
- }
/* destroy environment unless user has requested preservation */
if (!pflag)
strncpy(term, stypeof(tty), sizeof(term));
(void)setenv("TERM", term, 0);
(void)setenv("USER", pwd->pw_name, 1);
- (void)setenv("PATH", "/usr/ucb:/bin:/usr/bin:", 0);
+ (void)setenv("PATH", _PATH_DEFPATH, 0);
if (tty[sizeof("tty")-1] == 'd')
syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name);
motd();
(void)sprintf(tbuf, "%s/%s", _PATH_MAILDIR, pwd->pw_name);
if (stat(tbuf, &st) == 0 && st.st_size != 0)
- printf("You have %smail.\n",
+ (void)printf("You have %smail.\n",
(st.st_mtime > st.st_atime) ? "new " : "");
}
tbuf[0] = '-';
strcpy(tbuf + 1, (p = rindex(pwd->pw_shell, '/')) ?
p + 1 : pwd->pw_shell);
+
+ if (setlogin(pwd->pw_name) < 0)
+ syslog(LOG_ERR, "setlogin() failure: %m");
+
+ /* discard permissions last so can't get killed and drop core */
+ (void)setuid(pwd->pw_uid);
+
execlp(pwd->pw_shell, tbuf, 0);
- fprintf(stderr, "login: no shell: ");
- perror(pwd->pw_shell);
+ (void)fprintf(stderr, "login: no shell: %s.\n", strerror(errno));
exit(0);
}
static char nbuf[UT_NAMESIZE + 1];
for (;;) {
- printf("login: ");
+ (void)printf("login: ");
for (p = nbuf; (ch = getchar()) != '\n'; ) {
if (ch == EOF) {
badlogin(username);
}
if (p > nbuf)
if (nbuf[0] == '-')
- fprintf(stderr,
+ (void)fprintf(stderr,
"login names may not start with '-'.\n");
else {
*p = '\0';
timedout()
{
- fprintf(stderr, "Login timed out after %d seconds\n", timeout);
+ (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout);
exit(0);
}
motd()
{
register int fd, nchars;
- int (*oldint)(), sigint();
+ sig_t oldint;
+ int sigint();
char tbuf[8192];
if ((fd = open(_PATH_MOTDFILE, O_RDONLY, 0)) < 0)
if (!quiet) {
if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) &&
ll.ll_time != 0) {
- printf("Last login: %.*s ",
+ (void)printf("Last login: %.*s ",
24-5, (char *)ctime(&ll.ll_time));
if (*ll.ll_host != '\0')
- printf("from %.*s\n",
+ (void)printf("from %.*s\n",
sizeof(ll.ll_host), ll.ll_host);
else
- printf("on %.*s\n",
+ (void)printf("on %.*s\n",
sizeof(ll.ll_line), ll.ll_line);
}
(void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET);
if (read(0, &ch, sizeof(ch)) != sizeof(ch))
exit(1);
if (--cnt < 0) {
- fprintf(stderr, "%s too long\r\n", err);
+ (void)fprintf(stderr, "%s too long\r\n", err);
sleepexit(1);
}
*buf++ = ch;
sleep((u_int)5);
exit(eval);
}
+
+doremotelogin(host)
+ char *host;
+{
+ static char lusername[UT_NAMESIZE+1];
+ char rusername[UT_NAMESIZE+1];
+
+ getstr(rusername, sizeof(rusername), "remuser");
+ getstr(lusername, sizeof(lusername), "locuser");
+ getstr(term, sizeof(term), "Terminal type");
+ username = lusername;
+ pwd = getpwnam(username);
+ if (pwd == NULL)
+ return(-1);
+ return(ruserok(host, (pwd->pw_uid == 0), rusername, username));
+}
+
+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(tp)
+ struct sgttyb *tp;
+{
+ register char *cp = index(term, '/'), **cpp;
+ char *speed;
+
+ if (cp) {
+ *cp++ = '\0';
+ speed = cp;
+ cp = index(speed, '/');
+ if (cp)
+ *cp++ = '\0';
+ for (cpp = speeds; cpp < &speeds[NSPEEDS]; cpp++)
+ if (strcmp(*cpp, speed) == 0) {
+ tp->sg_ispeed = tp->sg_ospeed = cpp-speeds;
+ break;
+ }
+ }
+ tp->sg_flags = ECHO|CRMOD|ANYP|XTABS;
+}