/*-
- * Copyright (c) 1980, 1987, 1988, 1991 The Regents of the University
- * of California. All rights reserved.
+ * Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994
+ * The Regents of the University of California. All rights reserved.
*
* %sccs.include.redist.c%
*/
#ifndef lint
-char copyright[] =
-"@(#) Copyright (c) 1980, 1987, 1988, 1991 The Regents of the University of California.\n\
- All rights reserved.\n";
+static char copyright[] =
+"@(#) Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994\n\
+ The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
-static char sccsid[] = "@(#)login.c 5.67 (Berkeley) %G%";
+static char sccsid[] = "@(#)login.c 8.4 (Berkeley) %G%";
#endif /* not lint */
/*
#include <sys/resource.h>
#include <sys/file.h>
-#include <utmp.h>
-#include <signal.h>
+#include <err.h>
#include <errno.h>
-#include <ttyent.h>
-#include <syslog.h>
#include <grp.h>
#include <pwd.h>
#include <setjmp.h>
+#include <signal.h>
#include <stdio.h>
+#include <stdlib.h>
#include <string.h>
+#include <syslog.h>
+#include <ttyent.h>
#include <tzfile.h>
+#include <unistd.h>
+#include <utmp.h>
+
#include "pathnames.h"
+void badlogin __P((char *));
+void checknologin __P((void));
+void dolastlog __P((int));
+void getloginname __P((void));
+void motd __P((void));
+int rootterm __P((char *));
+void sigint __P((int));
+void sleepexit __P((int));
+char *stypeof __P((char *));
+void timedout __P((int));
+#ifdef KERBEROS
+int klogin __P((struct passwd *, char *, char *, char *));
+#endif
+
+extern void login __P((struct utmp *));
+
#define TTYGRPNAME "tty" /* name of group to own ttys */
/*
* This bounds the time given to login. Not a define so it can
* be patched on machines where it's too small.
*/
-int timeout = 300;
+u_int timeout = 300;
+
#ifdef KERBEROS
int notickets = 1;
+char *instance;
+char *krbtkfile_env;
+int authok;
#endif
struct passwd *pwd;
int failures;
char term[64], *envinit[1], *hostname, *username, *tty;
+int
char *months[] =
{ "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug",
"Sep", "Oct", "Nov", "Dec" };
main(argc, argv)
int argc;
- char **argv;
+ char *argv[];
{
- extern int optind;
- extern char *optarg, **environ;
- struct timeval tp;
- struct tm *ttp;
- struct timeval tp;
+ extern char **environ;
struct group *gr;
- register int ch;
- register char *p;
- int ask, fflag, hflag, pflag, rflag, cnt;
- int quietlog, rval;
- char *domain, *salt, *ttyn;
+ struct stat st;
+ struct timeval tp;
+ struct utmp utmp;
+ int ask, ch, cnt, fflag, hflag, pflag, quietlog, rootlogin, rval;
+ uid_t uid;
+ char *domain, *p, *salt, *ttyn;
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 timedout();
(void)signal(SIGALRM, timedout);
- (void)alarm((u_int)timeout);
+ (void)alarm(timeout);
(void)signal(SIGQUIT, SIG_IGN);
(void)signal(SIGINT, SIG_IGN);
(void)setpriority(PRIO_PROCESS, 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
+ * -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
*/
if (gethostname(localhost, sizeof(localhost)) < 0)
syslog(LOG_ERR, "couldn't get local hostname: %m");
else
- domain = index(localhost, '.');
+ domain = strchr(localhost, '.');
fflag = hflag = pflag = rflag = 0;
uid = getuid();
fflag = 1;
break;
case 'h':
- if (uid) {
- (void)fprintf(stderr,
- "login: -h for super-user only.\n");
- exit(1);
- }
+ if (uid)
+ errx(1, "-h option: %s", strerror(EPERM));
if (rflag) {
fprintf(stderr,
"login: only one of -r and -h allowed.\n");
exit(1);
}
hflag = 1;
- if (domain && (p = index(optarg, '.')) &&
+ if (domain && (p = strchr(optarg, '.')) &&
strcasecmp(p, domain) == 0)
*p = 0;
hostname = optarg;
if (!uid)
syslog(LOG_ERR, "invalid flag %c", ch);
(void)fprintf(stderr,
- "usage: login [-fp] [username]\n");
+ "usage: login [-fp] [-h hostname] [username]\n");
exit(1);
}
argc -= optind;
argv += optind;
+
if (*argv) {
username = *argv;
- if (strlen(username) > UT_NAMESIZE)
- username[UT_NAMESIZE] = '\0';
ask = 0;
} else
ask = 1;
ask = 0;
for (cnt = getdtablesize(); cnt > 2; cnt--)
- close(cnt);
+ (void)close(cnt);
- ttyn = ttyname(0);
+ ttyn = ttyname(STDIN_FILENO);
if (ttyn == NULL || *ttyn == '\0') {
- (void)sprintf(tname, "%s??", _PATH_TTY);
+ (void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY);
ttyn = tname;
}
- if (tty = rindex(ttyn, '/'))
+ if (tty = strrchr(ttyn, '/'))
++tty;
else
tty = ttyn;
fflag = 0;
getloginname();
}
+ rootlogin = 0;
+#ifdef KERBEROS
+ if ((instance = strchr(username, '.')) != NULL) {
+ if (strncmp(instance, ".root", 5) == 0)
+ rootlogin = 1;
+ *instance++ = '\0';
+ } else
+ instance = "";
+#endif
+ if (strlen(username) > UT_NAMESIZE)
+ username[UT_NAMESIZE] = '\0';
+
/*
* Note if trying multiple user names; log failures for
* previous user name, but don't bother logging one failure
fflag && (uid == 0 || uid == pwd->pw_uid)))
break;
fflag = 0;
+ if (pwd && pwd->pw_uid == 0)
+ rootlogin = 1;
+
+ (void)setpriority(PRIO_PROCESS, 0, -4);
+
+ p = getpass("Password:");
+
+ if (pwd) {
+#ifdef KERBEROS
+ rval = klogin(pwd, instance, localhost, p);
+ if (rval != 0 && rootlogin && pwd->pw_uid != 0)
+ rootlogin = 0;
+ if (rval == 0)
+ authok = 1;
+ else if (rval == 1)
+ rval = strcmp(crypt(p, salt), pwd->pw_passwd);
+#else
+ rval = strcmp(crypt(p, salt), pwd->pw_passwd);
+#endif
+ }
+ memset(p, 0, strlen(p));
+
+ (void)setpriority(PRIO_PROCESS, 0, 0);
/*
- * If trying to log in as root, but with insecure terminal,
- * refuse the login attempt.
+ * If trying to log in as root without Kerberos,
+ * but with insecure terminal, refuse the login attempt.
*/
- if (pwd && pwd->pw_uid == 0 && !rootterm(tty)) {
+#ifdef KERBEROS
+ if (authok == 0)
+#endif
+ if (pwd && rootlogin && !rootterm(tty)) {
(void)fprintf(stderr,
"%s login refused on this terminal.\n",
pwd->pw_name);
continue;
}
- (void)setpriority(PRIO_PROCESS, 0, -4);
-
- p = getpass("Password:");
-
- if (pwd) {
- bzero(p, strlen(p));
-
- (void)setpriority(PRIO_PROCESS, 0, 0);
-
if (pwd && !rval)
break;
/* committed to login -- turn off timeout */
(void)alarm((u_int)0);
- /* paranoia... */
endpwent();
/* if user not super-user, check for disabled logins */
- if (pwd->pw_uid)
+ if (!rootlogin)
checknologin();
if (chdir(pwd->pw_dir) < 0) {
- (void)printf("No directory %s!\n", pwd->pw_dir);
+ (void)printf("No home directory %s!\n", pwd->pw_dir);
if (chdir("/"))
exit(0);
pwd->pw_dir = "/";
if (tp.tv_sec >= pwd->pw_change) {
(void)printf("Sorry -- your password has expired.\n");
sleepexit(1);
- }
- else if (pwd->pw_change - tp.tv_sec <
+ } else if (pwd->pw_change - tp.tv_sec <
2 * DAYSPERWEEK * SECSPERDAY && !quietlog)
(void)printf("Warning: your password expires on %s",
- ctime(&pwd->pw_expire));
+ ctime(&pwd->pw_change));
if (pwd->pw_expire)
if (tp.tv_sec >= pwd->pw_expire) {
(void)printf("Sorry -- your account has expired.\n");
sleepexit(1);
- }
- else if (pwd->pw_expire - tp.tv_sec <
+ } else if (pwd->pw_expire - tp.tv_sec <
2 * DAYSPERWEEK * SECSPERDAY && !quietlog)
(void)printf("Warning: your account expires on %s",
ctime(&pwd->pw_expire));
- /* nothing else left to fail -- really log in */
- {
- struct utmp utmp;
-
- bzero((void *)&utmp, 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);
- }
+ /* Nothing else left to fail -- really log in. */
+ memset((void *)&utmp, 0, sizeof(utmp));
+ (void)time(&utmp.ut_time);
+ (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name));
+ if (hostname)
+ (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host));
+ (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line));
+ login(&utmp);
dolastlog(quietlog);
(void)chown(ttyn, pwd->pw_uid,
(gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid);
- (void)chmod(ttyn, 0620);
(void)setgid(pwd->pw_gid);
initgroups(username, pwd->pw_gid);
if (*pwd->pw_shell == '\0')
pwd->pw_shell = _PATH_BSHELL;
- /* destroy environment unless user has requested preservation */
+ /* Destroy environment unless user has requested its preservation. */
if (!pflag)
environ = envinit;
(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)strncpy(term, stypeof(tty), sizeof(term));
(void)setenv("TERM", term, 0);
+ (void)setenv("LOGNAME", pwd->pw_name, 1);
(void)setenv("USER", pwd->pw_name, 1);
(void)setenv("PATH", _PATH_DEFPATH, 0);
+#ifdef KERBEROS
+ if (krbtkfile_env)
+ (void)setenv("KRBTKFILE", krbtkfile_env, 1);
+#endif
if (tty[sizeof("tty")-1] == 'd')
syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name);
- /* if fflag is on, assume caller/authenticator has logged root login */
- if (pwd->pw_uid == 0 && fflag == 0)
+
+ /* If fflag is on, assume caller/authenticator has logged root login. */
+ if (rootlogin && fflag == 0)
if (hostname)
- syslog(LOG_NOTICE, "ROOT LOGIN ON %s FROM %s",
- tty, hostname);
+ syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s",
+ username, tty, hostname);
else
- syslog(LOG_NOTICE, "ROOT LOGIN ON %s", tty);
+ syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", username, tty);
#ifdef KERBEROS
if (!quietlog && notickets == 1)
#endif
if (!quietlog) {
- struct stat st;
-
- printf(
-"Copyright (c) 1980,1983,1986,1988,1990,1991 The Regents of the University\n%s",
-"of California. All rights reserved.\n\n");
+ (void)printf("%s\n\t%s %s\n\n",
+ "Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994",
+ "The Regents of the University of California. ",
+ "All rights reserved.");
motd();
- (void)sprintf(tbuf, "%s/%s", _PATH_MAILDIR, pwd->pw_name);
+ (void)snprintf(tbuf,
+ sizeof(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(SIGTSTP, SIG_IGN);
tbuf[0] = '-';
- strcpy(tbuf + 1, (p = rindex(pwd->pw_shell, '/')) ?
+ (void)strcpy(tbuf + 1, (p = strrchr(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);
+ /* Discard permissions last so can't get killed and drop core. */
+ if (rootlogin)
+ (void) setuid(0);
+ else
+ (void) setuid(pwd->pw_uid);
execlp(pwd->pw_shell, tbuf, 0);
- (void)fprintf(stderr, "login: no shell: %s.\n", strerror(errno));
- exit(0);
+ err(1, "%s", pwd->pw_shell);
}
+#ifdef KERBEROS
+#define NBUFSIZ (UT_NAMESIZE + 1 + 5) /* .root suffix */
+#else
+#define NBUFSIZ (UT_NAMESIZE + 1)
+#endif
+
+void
getloginname()
{
- register int ch;
- register char *p;
- static char nbuf[UT_NAMESIZE + 1];
+ int ch;
+ char *p;
+ static char nbuf[NBUFSIZ];
for (;;) {
(void)printf("login: ");
badlogin(username);
exit(0);
}
- if (p < nbuf + UT_NAMESIZE)
+ if (p < nbuf + (NBUFSIZ - 1))
*p++ = ch;
}
if (p > nbuf)
}
}
-void
-timedout()
-{
- (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout);
- exit(0);
-}
-
+int
rootterm(ttyn)
char *ttyn;
{
struct ttyent *t;
- return((t = getttynam(ttyn)) && t->ty_status&TTY_SECURE);
+ return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE);
}
jmp_buf motdinterrupt;
+void
motd()
{
- register int fd, nchars;
+ int fd, nchars;
sig_t oldint;
- void sigint();
char tbuf[8192];
if ((fd = open(_PATH_MOTDFILE, O_RDONLY, 0)) < 0)
(void)close(fd);
}
+/* ARGSUSED */
void
-sigint()
+sigint(signo)
+ int signo;
{
+
longjmp(motdinterrupt, 1);
}
+/* ARGSUSED */
+void
+timedout(signo)
+ int signo;
+{
+
+ (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout);
+ exit(0);
+}
+
+void
checknologin()
{
- register int fd, nchars;
+ int fd, nchars;
char tbuf[8192];
if ((fd = open(_PATH_NOLOGIN, O_RDONLY, 0)) >= 0) {
}
}
+void
dolastlog(quiet)
int quiet;
{
struct lastlog ll;
int fd;
char *ctime();
- char *ctime();
if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) {
(void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET);
24-5, (char *)ctime(&ll.ll_time));
if (*ll.ll_host != '\0')
(void)printf("from %.*s\n",
- sizeof(ll.ll_host), ll.ll_host);
+ (int)sizeof(ll.ll_host),
+ ll.ll_host);
else
(void)printf("on %.*s\n",
- sizeof(ll.ll_line), ll.ll_line);
+ (int)sizeof(ll.ll_line),
+ ll.ll_line);
}
(void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET);
}
- bzero((void *)&ll, sizeof(ll));
+ memset((void *)&ll, 0, sizeof(ll));
(void)time(&ll.ll_time);
- strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
+ (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
if (hostname)
- strncpy(ll.ll_host, hostname, sizeof(ll.ll_host));
+ (void)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) {
{
struct ttyent *t;
- return(ttyid && (t = getttynam(ttyid)) ? t->ty_type : UNKNOWN);
+ return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : UNKNOWN);
}
+void
sleepexit(eval)
int eval;
{
- sleep((u_int)5);
+
+ (void)sleep(5);
exit(eval);
}