926 lines
22 KiB
C
926 lines
22 KiB
C
/*-
|
|
* Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#if 0
|
|
static char copyright[] =
|
|
"@(#) Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994\n\
|
|
The Regents of the University of California. All rights reserved.\n";
|
|
#endif
|
|
|
|
#ifndef lint
|
|
#if 0
|
|
static char sccsid[] = "@(#)login.c 8.4 (Berkeley) 4/2/94";
|
|
#endif
|
|
static const char rcsid[] =
|
|
"$FreeBSD$";
|
|
#endif /* not lint */
|
|
|
|
/*
|
|
* login [ name ]
|
|
* login -h hostname (for telnetd, etc.)
|
|
* login -f name (for pre-authenticated login: datakit, xterm, etc.)
|
|
*/
|
|
|
|
#include <sys/copyright.h>
|
|
#include <sys/param.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/time.h>
|
|
#include <sys/resource.h>
|
|
#include <sys/file.h>
|
|
#include <netinet/in.h>
|
|
#include <arpa/inet.h>
|
|
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <grp.h>
|
|
#include <libutil.h>
|
|
#include <login_cap.h>
|
|
#include <netdb.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 <unistd.h>
|
|
#include <utmp.h>
|
|
|
|
#ifndef NO_PAM
|
|
#include <security/pam_appl.h>
|
|
#include <security/pam_misc.h>
|
|
#endif
|
|
|
|
#include "pathnames.h"
|
|
|
|
/* wrapper for KAME-special getnameinfo() */
|
|
#ifndef NI_WITHSCOPEID
|
|
#define NI_WITHSCOPEID 0
|
|
#endif
|
|
|
|
void badlogin __P((char *));
|
|
void checknologin __P((void));
|
|
void dolastlog __P((int));
|
|
void getloginname __P((void));
|
|
void motd __P((char *));
|
|
int rootterm __P((char *));
|
|
void sigint __P((int));
|
|
void sleepexit __P((int));
|
|
void refused __P((char *,char *,int));
|
|
char *stypeof __P((char *));
|
|
void timedout __P((int));
|
|
int login_access __P((char *, char *));
|
|
void login_fbtab __P((char *, uid_t, gid_t));
|
|
|
|
#ifndef NO_PAM
|
|
static int auth_pam __P((void));
|
|
#endif
|
|
static int auth_traditional __P((void));
|
|
extern void login __P((struct utmp *));
|
|
static void usage __P((void));
|
|
|
|
#define TTYGRPNAME "tty" /* name of group to own ttys */
|
|
#define DEFAULT_BACKOFF 3
|
|
#define DEFAULT_RETRIES 10
|
|
|
|
/*
|
|
* This bounds the time given to login. Not a define so it can
|
|
* be patched on machines where it's too small.
|
|
*/
|
|
u_int timeout = 300;
|
|
|
|
/* Buffer for signal handling of timeout */
|
|
jmp_buf timeout_buf;
|
|
|
|
struct passwd *pwd;
|
|
int failures;
|
|
char *term, *envinit[1], *hostname, *username, *tty;
|
|
char full_hostname[MAXHOSTNAMELEN];
|
|
|
|
int
|
|
main(argc, argv)
|
|
int argc;
|
|
char *argv[];
|
|
{
|
|
extern char **environ;
|
|
struct group *gr;
|
|
struct stat st;
|
|
struct timeval tp;
|
|
struct utmp utmp;
|
|
int rootok, retries, backoff;
|
|
int ask, ch, cnt, fflag, hflag, pflag, quietlog, rootlogin, rval;
|
|
int changepass;
|
|
time_t warntime;
|
|
uid_t uid, euid;
|
|
gid_t egid;
|
|
char *p, *ttyn;
|
|
char tbuf[MAXPATHLEN + 2];
|
|
char tname[sizeof(_PATH_TTY) + 10];
|
|
char *shell = NULL;
|
|
login_cap_t *lc = NULL;
|
|
|
|
(void)signal(SIGQUIT, SIG_IGN);
|
|
(void)signal(SIGINT, SIG_IGN);
|
|
if (setjmp(timeout_buf)) {
|
|
if (failures)
|
|
badlogin(tbuf);
|
|
(void)fprintf(stderr,
|
|
"Login timed out after %d seconds\n", timeout);
|
|
exit(0);
|
|
}
|
|
(void)signal(SIGALRM, timedout);
|
|
(void)alarm(timeout);
|
|
(void)setpriority(PRIO_PROCESS, 0, 0);
|
|
|
|
openlog("login", LOG_ODELAY, LOG_AUTH);
|
|
|
|
/*
|
|
* -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
|
|
*/
|
|
*full_hostname = '\0';
|
|
term = NULL;
|
|
|
|
fflag = hflag = pflag = 0;
|
|
uid = getuid();
|
|
euid = geteuid();
|
|
egid = getegid();
|
|
while ((ch = getopt(argc, argv, "fh:p")) != -1)
|
|
switch (ch) {
|
|
case 'f':
|
|
fflag = 1;
|
|
break;
|
|
case 'h':
|
|
if (uid)
|
|
errx(1, "-h option: %s", strerror(EPERM));
|
|
hflag = 1;
|
|
strncpy(full_hostname, optarg, sizeof(full_hostname)-1);
|
|
|
|
trimdomain(optarg, UT_HOSTSIZE);
|
|
|
|
if (strlen(optarg) > UT_HOSTSIZE) {
|
|
struct addrinfo hints, *res;
|
|
int ga_err;
|
|
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_family = AF_UNSPEC;
|
|
ga_err = getaddrinfo(optarg, NULL, &hints,
|
|
&res);
|
|
if (ga_err == 0) {
|
|
char hostbuf[MAXHOSTNAMELEN];
|
|
|
|
getnameinfo(res->ai_addr,
|
|
res->ai_addrlen,
|
|
hostbuf,
|
|
sizeof(hostbuf), NULL, 0,
|
|
NI_NUMERICHOST|
|
|
NI_WITHSCOPEID);
|
|
optarg = strdup(hostbuf);
|
|
} else
|
|
optarg = "invalid hostname";
|
|
if (res != NULL)
|
|
freeaddrinfo(res);
|
|
}
|
|
hostname = optarg;
|
|
break;
|
|
case 'p':
|
|
pflag = 1;
|
|
break;
|
|
case '?':
|
|
default:
|
|
if (!uid)
|
|
syslog(LOG_ERR, "invalid flag %c", ch);
|
|
usage();
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
if (*argv) {
|
|
username = *argv;
|
|
ask = 0;
|
|
} else
|
|
ask = 1;
|
|
|
|
for (cnt = getdtablesize(); cnt > 2; cnt--)
|
|
(void)close(cnt);
|
|
|
|
ttyn = ttyname(STDIN_FILENO);
|
|
if (ttyn == NULL || *ttyn == '\0') {
|
|
(void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY);
|
|
ttyn = tname;
|
|
}
|
|
if ((tty = strrchr(ttyn, '/')) != NULL)
|
|
++tty;
|
|
else
|
|
tty = ttyn;
|
|
|
|
/*
|
|
* Get "login-retries" & "login-backoff" from default class
|
|
*/
|
|
lc = login_getclass(NULL);
|
|
retries = login_getcapnum(lc, "login-retries", DEFAULT_RETRIES, DEFAULT_RETRIES);
|
|
backoff = login_getcapnum(lc, "login-backoff", DEFAULT_BACKOFF, DEFAULT_BACKOFF);
|
|
login_close(lc);
|
|
lc = NULL;
|
|
|
|
for (cnt = 0;; ask = 1) {
|
|
if (ask) {
|
|
fflag = 0;
|
|
getloginname();
|
|
}
|
|
rootlogin = 0;
|
|
rootok = rootterm(tty); /* Default (auth may change) */
|
|
|
|
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
|
|
* for nonexistent name (mistyped username).
|
|
*/
|
|
if (failures && strcmp(tbuf, username)) {
|
|
if (failures > (pwd ? 0 : 1))
|
|
badlogin(tbuf);
|
|
}
|
|
(void)strncpy(tbuf, username, sizeof tbuf-1);
|
|
tbuf[sizeof tbuf-1] = '\0';
|
|
|
|
pwd = getpwnam(username);
|
|
|
|
/*
|
|
* if we have a valid account name, and it doesn't have a
|
|
* password, or the -f option was specified and the caller
|
|
* is root or the caller isn't changing their uid, don't
|
|
* authenticate.
|
|
*/
|
|
if (pwd != NULL) {
|
|
if (pwd->pw_uid == 0)
|
|
rootlogin = 1;
|
|
|
|
if (fflag && (uid == (uid_t)0 ||
|
|
uid == (uid_t)pwd->pw_uid)) {
|
|
/* already authenticated */
|
|
break;
|
|
} else if (pwd->pw_passwd[0] == '\0') {
|
|
if (!rootlogin || rootok) {
|
|
/* pretend password okay */
|
|
rval = 0;
|
|
goto ttycheck;
|
|
}
|
|
}
|
|
}
|
|
|
|
fflag = 0;
|
|
|
|
(void)setpriority(PRIO_PROCESS, 0, -4);
|
|
|
|
#ifndef NO_PAM
|
|
/*
|
|
* Try to authenticate using PAM. If a PAM system error
|
|
* occurs, perhaps because of a botched configuration,
|
|
* then fall back to using traditional Unix authentication.
|
|
*/
|
|
if ((rval = auth_pam()) == -1)
|
|
#endif /* NO_PAM */
|
|
rval = auth_traditional();
|
|
|
|
(void)setpriority(PRIO_PROCESS, 0, 0);
|
|
|
|
#ifndef NO_PAM
|
|
/*
|
|
* PAM authentication may have changed "pwd" to the
|
|
* entry for the template user. Check again to see if
|
|
* this is a root login after all.
|
|
*/
|
|
if (pwd != NULL && pwd->pw_uid == 0)
|
|
rootlogin = 1;
|
|
#endif /* NO_PAM */
|
|
|
|
ttycheck:
|
|
/*
|
|
* If trying to log in as root without Kerberos,
|
|
* but with insecure terminal, refuse the login attempt.
|
|
*/
|
|
if (pwd && !rval) {
|
|
if (rootlogin && !rootok)
|
|
refused(NULL, "NOROOT", 0);
|
|
else /* valid password & authenticated */
|
|
break;
|
|
}
|
|
|
|
(void)printf("Login incorrect\n");
|
|
failures++;
|
|
|
|
/*
|
|
* we allow up to 'retry' (10) tries,
|
|
* but after 'backoff' (3) we start backing off
|
|
*/
|
|
if (++cnt > backoff) {
|
|
if (cnt >= retries) {
|
|
badlogin(username);
|
|
sleepexit(1);
|
|
}
|
|
sleep((u_int)((cnt - backoff) * 5));
|
|
}
|
|
}
|
|
|
|
/* committed to login -- turn off timeout */
|
|
(void)alarm((u_int)0);
|
|
|
|
endpwent();
|
|
|
|
/*
|
|
* Establish the login class.
|
|
*/
|
|
lc = login_getpwclass(pwd);
|
|
|
|
/* if user not super-user, check for disabled logins */
|
|
if (!rootlogin)
|
|
auth_checknologin(lc);
|
|
|
|
quietlog = login_getcapbool(lc, "hushlogin", 0);
|
|
/* Switching needed for NFS with root access disabled */
|
|
(void)setegid(pwd->pw_gid);
|
|
(void)seteuid(rootlogin ? 0 : pwd->pw_uid);
|
|
if (!*pwd->pw_dir || chdir(pwd->pw_dir) < 0) {
|
|
if (login_getcapbool(lc, "requirehome", 0))
|
|
refused("Home directory not available", "HOMEDIR", 1);
|
|
if (chdir("/") < 0)
|
|
refused("Cannot find root directory", "ROOTDIR", 1);
|
|
if (!quietlog || *pwd->pw_dir)
|
|
printf("No home directory.\nLogging in with home = \"/\".\n");
|
|
pwd->pw_dir = "/";
|
|
}
|
|
(void)seteuid(euid);
|
|
(void)setegid(egid);
|
|
if (!quietlog)
|
|
quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0;
|
|
|
|
if (pwd->pw_change || pwd->pw_expire)
|
|
(void)gettimeofday(&tp, (struct timezone *)NULL);
|
|
|
|
#define DEFAULT_WARN (2L * 7L * 86400L) /* Two weeks */
|
|
|
|
warntime = login_getcaptime(lc, "warnpassword",
|
|
DEFAULT_WARN, DEFAULT_WARN);
|
|
|
|
changepass=0;
|
|
if (pwd->pw_change) {
|
|
if (tp.tv_sec >= pwd->pw_change) {
|
|
(void)printf("Sorry -- your password has expired.\n");
|
|
changepass=1;
|
|
syslog(LOG_INFO,
|
|
"%s Password expired - forcing change",
|
|
pwd->pw_name);
|
|
} else if (pwd->pw_change - tp.tv_sec < warntime && !quietlog)
|
|
(void)printf("Warning: your password expires on %s",
|
|
ctime(&pwd->pw_change));
|
|
}
|
|
|
|
warntime = login_getcaptime(lc, "warnexpire",
|
|
DEFAULT_WARN, DEFAULT_WARN);
|
|
|
|
if (pwd->pw_expire) {
|
|
if (tp.tv_sec >= pwd->pw_expire) {
|
|
refused("Sorry -- your account has expired",
|
|
"EXPIRED", 1);
|
|
} else if (pwd->pw_expire - tp.tv_sec < warntime && !quietlog)
|
|
(void)printf("Warning: your account expires on %s",
|
|
ctime(&pwd->pw_expire));
|
|
}
|
|
|
|
if (lc != NULL) {
|
|
if (hostname) {
|
|
struct addrinfo hints, *res;
|
|
int ga_err;
|
|
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_family = AF_UNSPEC;
|
|
ga_err = getaddrinfo(full_hostname, NULL, &hints,
|
|
&res);
|
|
if (ga_err == 0) {
|
|
char hostbuf[MAXHOSTNAMELEN];
|
|
|
|
getnameinfo(res->ai_addr, res->ai_addrlen,
|
|
hostbuf, sizeof(hostbuf), NULL, 0,
|
|
NI_NUMERICHOST|NI_WITHSCOPEID);
|
|
optarg = strdup(hostbuf);
|
|
} else
|
|
optarg = NULL;
|
|
if (res != NULL)
|
|
freeaddrinfo(res);
|
|
if (!auth_hostok(lc, full_hostname, optarg))
|
|
refused("Permission denied", "HOST", 1);
|
|
}
|
|
|
|
if (!auth_ttyok(lc, tty))
|
|
refused("Permission denied", "TTY", 1);
|
|
|
|
if (!auth_timeok(lc, time(NULL)))
|
|
refused("Logins not available right now", "TIME", 1);
|
|
}
|
|
shell=login_getcapstr(lc, "shell", pwd->pw_shell, pwd->pw_shell);
|
|
if (*pwd->pw_shell == '\0')
|
|
pwd->pw_shell = _PATH_BSHELL;
|
|
if (*shell == '\0') /* Not overridden */
|
|
shell = pwd->pw_shell;
|
|
if ((shell = strdup(shell)) == NULL) {
|
|
syslog(LOG_NOTICE, "memory allocation error");
|
|
sleepexit(1);
|
|
}
|
|
|
|
#ifdef LOGIN_ACCESS
|
|
if (login_access(pwd->pw_name, hostname ? full_hostname : tty) == 0)
|
|
refused("Permission denied", "ACCESS", 1);
|
|
#endif /* LOGIN_ACCESS */
|
|
|
|
/* 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);
|
|
|
|
/*
|
|
* Set device protections, depending on what terminal the
|
|
* user is logged in. This feature is used on Suns to give
|
|
* console users better privacy.
|
|
*/
|
|
login_fbtab(tty, pwd->pw_uid, pwd->pw_gid);
|
|
|
|
/*
|
|
* Clear flags of the tty. None should be set, and when the
|
|
* user sets them otherwise, this can cause the chown to fail.
|
|
* Since it isn't clear that flags are useful on character
|
|
* devices, we just clear them.
|
|
*/
|
|
if (chflags(ttyn, 0) && errno != EOPNOTSUPP)
|
|
syslog(LOG_ERR, "chmod(%s): %m", ttyn);
|
|
if (chown(ttyn, pwd->pw_uid,
|
|
(gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid))
|
|
syslog(LOG_ERR, "chmod(%s): %m", ttyn);
|
|
|
|
|
|
/*
|
|
* Preserve TERM if it happens to be already set.
|
|
*/
|
|
if ((term = getenv("TERM")) != NULL)
|
|
term = strdup(term);
|
|
|
|
/*
|
|
* Exclude cons/vt/ptys only, assume dialup otherwise
|
|
* TODO: Make dialup tty determination a library call
|
|
* for consistency (finger etc.)
|
|
*/
|
|
if (hostname==NULL && isdialuptty(tty))
|
|
syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name);
|
|
|
|
#ifdef LOGALL
|
|
/*
|
|
* Syslog each successful login, so we don't have to watch hundreds
|
|
* of wtmp or lastlogin files.
|
|
*/
|
|
if (hostname)
|
|
syslog(LOG_INFO, "login from %s on %s as %s",
|
|
full_hostname, tty, pwd->pw_name);
|
|
else
|
|
syslog(LOG_INFO, "login on %s as %s",
|
|
tty, pwd->pw_name);
|
|
#endif
|
|
|
|
/*
|
|
* If fflag is on, assume caller/authenticator has logged root login.
|
|
*/
|
|
if (rootlogin && fflag == 0)
|
|
{
|
|
if (hostname)
|
|
syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s",
|
|
username, tty, full_hostname);
|
|
else
|
|
syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s",
|
|
username, tty);
|
|
}
|
|
|
|
/*
|
|
* Destroy environment unless user has requested its preservation.
|
|
* We need to do this before setusercontext() because that may
|
|
* set or reset some environment variables.
|
|
*/
|
|
if (!pflag)
|
|
environ = envinit;
|
|
|
|
/*
|
|
* We don't need to be root anymore, so
|
|
* set the user and session context
|
|
*/
|
|
if (setlogin(username) != 0) {
|
|
syslog(LOG_ERR, "setlogin(%s): %m - exiting", username);
|
|
exit(1);
|
|
}
|
|
if (setusercontext(lc, pwd, pwd->pw_uid,
|
|
LOGIN_SETALL & ~LOGIN_SETLOGIN) != 0) {
|
|
syslog(LOG_ERR, "setusercontext() failed - exiting");
|
|
exit(1);
|
|
}
|
|
|
|
(void)setenv("SHELL", pwd->pw_shell, 1);
|
|
(void)setenv("HOME", pwd->pw_dir, 1);
|
|
if (term != NULL && *term != '\0')
|
|
(void)setenv("TERM", term, 1); /* Preset overrides */
|
|
else {
|
|
(void)setenv("TERM", stypeof(tty), 0); /* Fallback doesn't */
|
|
}
|
|
(void)setenv("LOGNAME", username, 1);
|
|
(void)setenv("USER", username, 1);
|
|
(void)setenv("PATH", rootlogin ? _PATH_STDPATH : _PATH_DEFPATH, 0);
|
|
|
|
if (!quietlog) {
|
|
char *cw;
|
|
|
|
cw = login_getcapstr(lc, "copyright", NULL, NULL);
|
|
if (cw != NULL && access(cw, F_OK) == 0)
|
|
motd(cw);
|
|
else
|
|
(void)printf("%s\n\t%s %s\n",
|
|
"Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994",
|
|
"The Regents of the University of California. ",
|
|
"All rights reserved.");
|
|
|
|
(void)printf("\n");
|
|
|
|
cw = login_getcapstr(lc, "welcome", NULL, NULL);
|
|
if (cw == NULL || access(cw, F_OK) != 0)
|
|
cw = _PATH_MOTDFILE;
|
|
motd(cw);
|
|
|
|
cw = getenv("MAIL"); /* $MAIL may have been set by class */
|
|
if (cw != NULL) {
|
|
strncpy(tbuf, cw, sizeof(tbuf));
|
|
tbuf[sizeof(tbuf)-1] = '\0';
|
|
} else
|
|
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 " : "");
|
|
}
|
|
|
|
login_close(lc);
|
|
|
|
(void)signal(SIGALRM, SIG_DFL);
|
|
(void)signal(SIGQUIT, SIG_DFL);
|
|
(void)signal(SIGINT, SIG_DFL);
|
|
(void)signal(SIGTSTP, SIG_IGN);
|
|
|
|
if (changepass) {
|
|
if (system(_PATH_CHPASS) != 0)
|
|
sleepexit(1);
|
|
}
|
|
|
|
/*
|
|
* Login shells have a leading '-' in front of argv[0]
|
|
*/
|
|
tbuf[0] = '-';
|
|
(void)strcpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ? p + 1 : pwd->pw_shell);
|
|
|
|
execlp(shell, tbuf, 0);
|
|
err(1, "%s", shell);
|
|
}
|
|
|
|
static int
|
|
auth_traditional()
|
|
{
|
|
int rval;
|
|
char *p;
|
|
char *ep;
|
|
char *salt;
|
|
|
|
rval = 1;
|
|
salt = pwd != NULL ? pwd->pw_passwd : "xx";
|
|
|
|
p = getpass("Password:");
|
|
ep = crypt(p, salt);
|
|
|
|
if (pwd) {
|
|
if (!p[0] && pwd->pw_passwd[0])
|
|
ep = ":";
|
|
if (strcmp(ep, pwd->pw_passwd) == 0)
|
|
rval = 0;
|
|
}
|
|
|
|
/* clear entered password */
|
|
memset(p, 0, strlen(p));
|
|
return rval;
|
|
}
|
|
|
|
#ifndef NO_PAM
|
|
/*
|
|
* Attempt to authenticate the user using PAM. Returns 0 if the user is
|
|
* authenticated, or 1 if not authenticated. If some sort of PAM system
|
|
* error occurs (e.g., the "/etc/pam.conf" file is missing) then this
|
|
* function returns -1. This can be used as an indication that we should
|
|
* fall back to a different authentication mechanism.
|
|
*/
|
|
static int
|
|
auth_pam()
|
|
{
|
|
pam_handle_t *pamh = NULL;
|
|
const char *tmpl_user;
|
|
const void *item;
|
|
int rval;
|
|
int e;
|
|
static struct pam_conv conv = { misc_conv, NULL };
|
|
|
|
if ((e = pam_start("login", username, &conv, &pamh)) != PAM_SUCCESS) {
|
|
syslog(LOG_ERR, "pam_start: %s", pam_strerror(pamh, e));
|
|
return -1;
|
|
}
|
|
if ((e = pam_set_item(pamh, PAM_TTY, tty)) != PAM_SUCCESS) {
|
|
syslog(LOG_ERR, "pam_set_item(PAM_TTY): %s",
|
|
pam_strerror(pamh, e));
|
|
return -1;
|
|
}
|
|
if (hostname != NULL &&
|
|
(e = pam_set_item(pamh, PAM_RHOST, full_hostname)) != PAM_SUCCESS) {
|
|
syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s",
|
|
pam_strerror(pamh, e));
|
|
return -1;
|
|
}
|
|
e = pam_authenticate(pamh, 0);
|
|
switch (e) {
|
|
|
|
case PAM_SUCCESS:
|
|
/*
|
|
* With PAM we support the concept of a "template"
|
|
* user. The user enters a login name which is
|
|
* authenticated by PAM, usually via a remote service
|
|
* such as RADIUS or TACACS+. If authentication
|
|
* succeeds, a different but related "template" name
|
|
* is used for setting the credentials, shell, and
|
|
* home directory. The name the user enters need only
|
|
* exist on the remote authentication server, but the
|
|
* template name must be present in the local password
|
|
* database.
|
|
*
|
|
* This is supported by two various mechanisms in the
|
|
* individual modules. However, from the application's
|
|
* point of view, the template user is always passed
|
|
* back as a changed value of the PAM_USER item.
|
|
*/
|
|
if ((e = pam_get_item(pamh, PAM_USER, &item)) ==
|
|
PAM_SUCCESS) {
|
|
tmpl_user = (const char *) item;
|
|
if (strcmp(username, tmpl_user) != 0)
|
|
pwd = getpwnam(tmpl_user);
|
|
} else
|
|
syslog(LOG_ERR, "Couldn't get PAM_USER: %s",
|
|
pam_strerror(pamh, e));
|
|
rval = 0;
|
|
break;
|
|
|
|
case PAM_AUTH_ERR:
|
|
case PAM_USER_UNKNOWN:
|
|
case PAM_MAXTRIES:
|
|
rval = 1;
|
|
break;
|
|
|
|
default:
|
|
syslog(LOG_ERR, "auth_pam: %s", pam_strerror(pamh, e));
|
|
rval = -1;
|
|
break;
|
|
}
|
|
if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
|
|
syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
|
|
rval = -1;
|
|
}
|
|
return rval;
|
|
}
|
|
#endif /* NO_PAM */
|
|
|
|
static void
|
|
usage()
|
|
{
|
|
(void)fprintf(stderr, "usage: login [-fp] [-h hostname] [username]\n");
|
|
exit(1);
|
|
}
|
|
|
|
/*
|
|
* Allow for authentication style and/or kerberos instance
|
|
* */
|
|
|
|
#define NBUFSIZ UT_NAMESIZE + 64
|
|
|
|
void
|
|
getloginname()
|
|
{
|
|
int ch;
|
|
char *p;
|
|
static char nbuf[NBUFSIZ];
|
|
|
|
for (;;) {
|
|
(void)printf("login: ");
|
|
for (p = nbuf; (ch = getchar()) != '\n'; ) {
|
|
if (ch == EOF) {
|
|
badlogin(username);
|
|
exit(0);
|
|
}
|
|
if (p < nbuf + (NBUFSIZ - 1))
|
|
*p++ = ch;
|
|
}
|
|
if (p > nbuf) {
|
|
if (nbuf[0] == '-')
|
|
(void)fprintf(stderr,
|
|
"login names may not start with '-'.\n");
|
|
else {
|
|
*p = '\0';
|
|
username = nbuf;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
int
|
|
rootterm(ttyn)
|
|
char *ttyn;
|
|
{
|
|
struct ttyent *t;
|
|
|
|
return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE);
|
|
}
|
|
|
|
volatile int motdinterrupt;
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
sigint(signo)
|
|
int signo;
|
|
{
|
|
motdinterrupt = 1;
|
|
}
|
|
|
|
void
|
|
motd(motdfile)
|
|
char *motdfile;
|
|
{
|
|
int fd, nchars;
|
|
sig_t oldint;
|
|
char tbuf[256];
|
|
|
|
if ((fd = open(motdfile, O_RDONLY, 0)) < 0)
|
|
return;
|
|
motdinterrupt = 0;
|
|
oldint = signal(SIGINT, sigint);
|
|
while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0 && !motdinterrupt)
|
|
(void)write(fileno(stdout), tbuf, nchars);
|
|
(void)signal(SIGINT, oldint);
|
|
(void)close(fd);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
timedout(signo)
|
|
int signo;
|
|
{
|
|
longjmp(timeout_buf, signo);
|
|
}
|
|
|
|
|
|
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')
|
|
(void)printf("from %.*s\n",
|
|
(int)sizeof(ll.ll_host),
|
|
ll.ll_host);
|
|
else
|
|
(void)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((void *)&ll, 0, sizeof(ll));
|
|
(void)time(&ll.ll_time);
|
|
(void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
|
|
if (hostname)
|
|
(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) {
|
|
syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s",
|
|
failures, failures > 1 ? "S" : "", full_hostname);
|
|
syslog(LOG_AUTHPRIV|LOG_NOTICE,
|
|
"%d LOGIN FAILURE%s FROM %s, %s",
|
|
failures, failures > 1 ? "S" : "", full_hostname, name);
|
|
} else {
|
|
syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s",
|
|
failures, failures > 1 ? "S" : "", tty);
|
|
syslog(LOG_AUTHPRIV|LOG_NOTICE,
|
|
"%d LOGIN FAILURE%s ON %s, %s",
|
|
failures, failures > 1 ? "S" : "", tty, name);
|
|
}
|
|
failures = 0;
|
|
}
|
|
|
|
#undef UNKNOWN
|
|
#define UNKNOWN "su"
|
|
|
|
char *
|
|
stypeof(ttyid)
|
|
char *ttyid;
|
|
{
|
|
|
|
struct ttyent *t;
|
|
|
|
return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : UNKNOWN);
|
|
}
|
|
|
|
void
|
|
refused(msg, rtype, lout)
|
|
char *msg;
|
|
char *rtype;
|
|
int lout;
|
|
{
|
|
|
|
if (msg != NULL)
|
|
printf("%s.\n", msg);
|
|
if (hostname)
|
|
syslog(LOG_NOTICE, "LOGIN %s REFUSED (%s) FROM %s ON TTY %s",
|
|
pwd->pw_name, rtype, full_hostname, tty);
|
|
else
|
|
syslog(LOG_NOTICE, "LOGIN %s REFUSED (%s) ON TTY %s",
|
|
pwd->pw_name, rtype, tty);
|
|
if (lout)
|
|
sleepexit(1);
|
|
}
|
|
|
|
void
|
|
sleepexit(eval)
|
|
int eval;
|
|
{
|
|
|
|
(void)sleep(5);
|
|
exit(eval);
|
|
}
|