1080 lines
27 KiB
C
1080 lines
27 KiB
C
/*-
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* Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 2002 Networks Associates Technologies, Inc.
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* All rights reserved.
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*
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* Portions of this software were developed for the FreeBSD Project by
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* ThinkSec AS and NAI Labs, the Security Research Division of Network
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* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
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* ("CBOSS"), as part of the DARPA CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)login.c 8.4 (Berkeley) 4/2/94";
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#endif
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* login [ name ]
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* login -h hostname (for telnetd, etc.)
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* login -f name (for pre-authenticated login: datakit, xterm, etc.)
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*/
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#include <sys/copyright.h>
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#include <sys/param.h>
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#include <sys/file.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/wait.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <err.h>
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#include <errno.h>
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#include <grp.h>
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#include <libutil.h>
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#include <login_cap.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <ttyent.h>
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#include <unistd.h>
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#include <utmp.h>
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#ifndef NO_PAM
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#include <security/pam_appl.h>
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#include <security/pam_misc.h>
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#endif
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#include "login.h"
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#include "pathnames.h"
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/* wrapper for KAME-special getnameinfo() */
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#ifndef NI_WITHSCOPEID
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#define NI_WITHSCOPEID 0
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#endif
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static int auth_traditional __P((void));
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static void badlogin __P((char *));
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static void dolastlog __P((int));
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static void getloginname __P((void));
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static void motd __P((const char *));
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static void refused __P((const char *,const char *,int));
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static int rootterm __P((char *));
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static void sigint __P((int));
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static void sleepexit __P((int));
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static const char *stypeof __P((char *));
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static void timedout __P((int));
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static void usage __P((void));
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#ifndef NO_PAM
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static int auth_pam __P((void));
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static int export_pam_environment __P((void));
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static int ok_to_export __P((const char *));
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static pam_handle_t *pamh = NULL;
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static char **environ_pam;
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#define PAM_END { \
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if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) \
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syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); \
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if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) \
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syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); \
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if ((e = pam_end(pamh, e)) != PAM_SUCCESS) \
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syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); \
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}
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#endif /* NO_PAM */
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#define TTYGRPNAME "tty" /* group to own ttys */
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#define DEFAULT_BACKOFF 3
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#define DEFAULT_RETRIES 10
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#define DEFAULT_PROMPT "login: "
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#define DEFAULT_PASSWD_PROMPT "Password:"
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#define INVALID_HOST "invalid hostname"
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#define UNKNOWN "su"
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#define DEFAULT_WARN (2L * 7L * 86400L) /* Two weeks */
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#define NBUFSIZ UT_NAMESIZE + 64
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/*
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* This bounds the time given to login. Not a define so it can
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* be patched on machines where it's too small.
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*/
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u_int timeout = 300;
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/* Buffer for signal handling of timeout */
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jmp_buf timeout_buf;
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struct passwd *pwd;
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int failures;
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char *term, *envinit[1], *hostname, *passwd_prompt, *prompt, *tty, *username;
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char full_hostname[MAXHOSTNAMELEN];
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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struct group *gr;
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struct stat st;
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struct timeval tp;
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struct utmp utmp;
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int rootok, retries, backoff;
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int ask, ch, cnt, fflag, hflag, pflag, quietlog, rootlogin, rval;
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time_t warntime;
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uid_t uid, euid;
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gid_t egid;
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char *p, *ttyn;
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char tbuf[MAXPATHLEN + 2];
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char tname[sizeof(_PATH_TTY) + 10];
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char *shell = NULL;
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static char default_prompt[] = DEFAULT_PROMPT;
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static char default_passwd_prompt[] = DEFAULT_PASSWD_PROMPT;
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static char invalid_host[] = INVALID_HOST;
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login_cap_t *lc = NULL;
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#ifndef NO_PAM
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pid_t pid;
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int e;
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#endif /* NO_PAM */
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(void)signal(SIGQUIT, SIG_IGN);
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(void)signal(SIGINT, SIG_IGN);
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(void)signal(SIGHUP, SIG_IGN);
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if (setjmp(timeout_buf)) {
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if (failures)
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badlogin(tbuf);
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(void)fprintf(stderr, "Login timed out after %d seconds\n",
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timeout);
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exit(0);
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}
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(void)signal(SIGALRM, timedout);
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(void)alarm(timeout);
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(void)setpriority(PRIO_PROCESS, 0, 0);
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openlog("login", LOG_ODELAY, LOG_AUTH);
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/*
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* -p is used by getty to tell login not to destroy the environment
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* -f is used to skip a second login authentication
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* -h is used by other servers to pass the name of the remote
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* host to login so that it may be placed in utmp and wtmp
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*/
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*full_hostname = '\0';
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term = NULL;
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fflag = hflag = pflag = 0;
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uid = getuid();
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euid = geteuid();
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egid = getegid();
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while ((ch = getopt(argc, argv, "fh:p")) != -1)
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switch (ch) {
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case 'f':
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fflag = 1;
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break;
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case 'h':
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if (uid)
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errx(1, "-h option: %s", strerror(EPERM));
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hflag = 1;
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if (strlcpy(full_hostname, optarg,
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sizeof(full_hostname)) >= sizeof(full_hostname))
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errx(1, "-h option: %s: exceeds maximum "
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"hostname size", optarg);
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trimdomain(optarg, UT_HOSTSIZE);
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if (strlen(optarg) > UT_HOSTSIZE) {
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struct addrinfo hints, *res;
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int ga_err;
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = AF_UNSPEC;
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ga_err = getaddrinfo(optarg, NULL, &hints,
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&res);
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if (ga_err == 0) {
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char hostbuf[MAXHOSTNAMELEN];
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getnameinfo(res->ai_addr,
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res->ai_addrlen,
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hostbuf,
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sizeof(hostbuf), NULL, 0,
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NI_NUMERICHOST|
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NI_WITHSCOPEID);
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optarg = strdup(hostbuf);
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if (optarg == NULL) {
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syslog(LOG_NOTICE,
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"strdup(): %m");
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sleepexit(1);
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}
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} else
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optarg = invalid_host;
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if (res != NULL)
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freeaddrinfo(res);
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}
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hostname = optarg;
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break;
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case 'p':
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pflag = 1;
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break;
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case '?':
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default:
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if (!uid)
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syslog(LOG_ERR, "invalid flag %c", ch);
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usage();
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}
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argc -= optind;
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argv += optind;
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if (*argv) {
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username = *argv;
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ask = 0;
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} else
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ask = 1;
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for (cnt = getdtablesize(); cnt > 2; cnt--)
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(void)close(cnt);
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ttyn = ttyname(STDIN_FILENO);
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if (ttyn == NULL || *ttyn == '\0') {
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(void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY);
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ttyn = tname;
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}
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if ((tty = strrchr(ttyn, '/')) != NULL)
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++tty;
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else
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tty = ttyn;
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/*
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* Get "login-retries" & "login-backoff" from default class
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*/
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lc = login_getclass(NULL);
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prompt = login_getcapstr(lc, "prompt", default_prompt, default_prompt);
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passwd_prompt = login_getcapstr(lc, "passwd_prompt",
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default_passwd_prompt, default_passwd_prompt);
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retries = login_getcapnum(lc, "login-retries", DEFAULT_RETRIES,
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DEFAULT_RETRIES);
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backoff = login_getcapnum(lc, "login-backoff", DEFAULT_BACKOFF,
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DEFAULT_BACKOFF);
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login_close(lc);
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lc = NULL;
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for (cnt = 0;; ask = 1) {
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if (ask) {
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fflag = 0;
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getloginname();
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}
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rootlogin = 0;
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rootok = rootterm(tty); /* Default (auth may change) */
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if (strlen(username) > UT_NAMESIZE)
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username[UT_NAMESIZE] = '\0';
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/*
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* Note if trying multiple user names; log failures for
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* previous user name, but don't bother logging one failure
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* for nonexistent name (mistyped username).
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*/
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if (failures && strcmp(tbuf, username)) {
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if (failures > (pwd ? 0 : 1))
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badlogin(tbuf);
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}
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(void)strlcpy(tbuf, username, sizeof(tbuf));
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pwd = getpwnam(username);
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/*
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* if we have a valid account name, and it doesn't have a
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* password, or the -f option was specified and the caller
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* is root or the caller isn't changing their uid, don't
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* authenticate.
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*/
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if (pwd != NULL) {
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if (pwd->pw_uid == 0)
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rootlogin = 1;
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if (fflag && (uid == (uid_t)0 ||
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uid == (uid_t)pwd->pw_uid)) {
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/* already authenticated */
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break;
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} else if (pwd->pw_passwd[0] == '\0') {
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if (!rootlogin || rootok) {
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/* pretend password okay */
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rval = 0;
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goto ttycheck;
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}
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}
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}
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fflag = 0;
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(void)setpriority(PRIO_PROCESS, 0, -4);
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#ifndef NO_PAM
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/*
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* Try to authenticate using PAM. If a PAM system error
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* occurs, perhaps because of a botched configuration,
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* then fall back to using traditional Unix authentication.
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*/
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if ((rval = auth_pam()) == -1)
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#endif /* NO_PAM */
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rval = auth_traditional();
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(void)setpriority(PRIO_PROCESS, 0, 0);
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/*
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* PAM authentication may have changed "pwd" to the
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* entry for the template user. Check again to see if
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* this is a root login after all.
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*/
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if (pwd != NULL && pwd->pw_uid == 0)
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rootlogin = 1;
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ttycheck:
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/*
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* If trying to log in as root without Kerberos,
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* but with insecure terminal, refuse the login attempt.
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*/
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if (pwd && !rval) {
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if (rootlogin && !rootok)
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refused(NULL, "NOROOT", 0);
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else /* valid password & authenticated */
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break;
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}
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(void)printf("Login incorrect\n");
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failures++;
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/*
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* we allow up to 'retry' (10) tries,
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* but after 'backoff' (3) we start backing off
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*/
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if (++cnt > backoff) {
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if (cnt >= retries) {
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badlogin(username);
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sleepexit(1);
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}
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sleep((u_int)((cnt - backoff) * 5));
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}
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}
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/* committed to login -- turn off timeout */
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(void)alarm((u_int)0);
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(void)signal(SIGHUP, SIG_DFL);
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endpwent();
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/*
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* Establish the login class.
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*/
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lc = login_getpwclass(pwd);
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quietlog = login_getcapbool(lc, "hushlogin", 0);
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/*
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* Switching needed for NFS with root access disabled.
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*
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* XXX: This change fails to modify the additional groups for the
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* process, and as such, may restrict rights normally granted
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* through those groups.
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*/
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(void)setegid(pwd->pw_gid);
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(void)seteuid(rootlogin ? 0 : pwd->pw_uid);
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if (!*pwd->pw_dir || chdir(pwd->pw_dir) < 0) {
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if (login_getcapbool(lc, "requirehome", 0))
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refused("Home directory not available", "HOMEDIR", 1);
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if (chdir("/") < 0)
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refused("Cannot find root directory", "ROOTDIR", 1);
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if (!quietlog || *pwd->pw_dir)
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printf("No home directory.\nLogging in with home = \"/\".\n");
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pwd->pw_dir = strdup("/");
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if (pwd->pw_dir == NULL) {
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syslog(LOG_NOTICE, "strdup(): %m");
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sleepexit(1);
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}
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}
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(void)seteuid(euid);
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(void)setegid(egid);
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if (!quietlog)
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quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0;
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if (pwd->pw_change || pwd->pw_expire)
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(void)gettimeofday(&tp, (struct timezone *)NULL);
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warntime = login_getcaptime(lc, "warnexpire", DEFAULT_WARN,
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DEFAULT_WARN);
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if (pwd->pw_expire) {
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if (tp.tv_sec >= pwd->pw_expire) {
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refused("Sorry -- your account has expired", "EXPIRED",
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1);
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} else if (pwd->pw_expire - tp.tv_sec < warntime && !quietlog)
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(void)printf("Warning: your account expires on %s",
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ctime(&pwd->pw_expire));
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}
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if (lc != NULL) {
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if (hostname) {
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struct addrinfo hints, *res;
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int ga_err;
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = AF_UNSPEC;
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ga_err = getaddrinfo(full_hostname, NULL, &hints,
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&res);
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if (ga_err == 0) {
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char hostbuf[MAXHOSTNAMELEN];
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getnameinfo(res->ai_addr, res->ai_addrlen,
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hostbuf, sizeof(hostbuf), NULL, 0,
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NI_NUMERICHOST|NI_WITHSCOPEID);
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if ((optarg = strdup(hostbuf)) == NULL) {
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syslog(LOG_NOTICE, "strdup(): %m");
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sleepexit(1);
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}
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} else
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optarg = NULL;
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if (res != NULL)
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freeaddrinfo(res);
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if (!auth_hostok(lc, full_hostname, optarg))
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refused("Permission denied", "HOST", 1);
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}
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if (!auth_ttyok(lc, tty))
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refused("Permission denied", "TTY", 1);
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if (!auth_timeok(lc, time(NULL)))
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refused("Logins not available right now", "TIME", 1);
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}
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shell = login_getcapstr(lc, "shell", pwd->pw_shell, pwd->pw_shell);
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if (*pwd->pw_shell == '\0')
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pwd->pw_shell = strdup(_PATH_BSHELL);
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if (pwd->pw_shell == NULL) {
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syslog(LOG_NOTICE, "strdup(): %m");
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sleepexit(1);
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}
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if (*shell == '\0') /* Not overridden */
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shell = pwd->pw_shell;
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if ((shell = strdup(shell)) == NULL) {
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syslog(LOG_NOTICE, "strdup(): %m");
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sleepexit(1);
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}
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#ifdef LOGIN_ACCESS
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if (login_access(pwd->pw_name, hostname ? full_hostname : tty) == 0)
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refused("Permission denied", "ACCESS", 1);
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#endif /* LOGIN_ACCESS */
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/* Nothing else left to fail -- really log in. */
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memset((void *)&utmp, 0, sizeof(utmp));
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(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) {
|
|
if ((term = strdup(term)) == NULL) {
|
|
syslog(LOG_NOTICE,
|
|
"strdup(): %m");
|
|
sleepexit(1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
/*
|
|
* PAM modules might add supplementary groups during pam_setcred().
|
|
*/
|
|
if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETGROUP) != 0) {
|
|
syslog(LOG_ERR, "setusercontext() failed - exiting");
|
|
exit(1);
|
|
}
|
|
|
|
#ifndef NO_PAM
|
|
if (pamh) {
|
|
if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) {
|
|
syslog(LOG_ERR, "pam_open_session: %s",
|
|
pam_strerror(pamh, e));
|
|
} else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED))
|
|
!= PAM_SUCCESS) {
|
|
syslog(LOG_ERR, "pam_setcred: %s",
|
|
pam_strerror(pamh, e));
|
|
}
|
|
|
|
/*
|
|
* Add any environmental variables that the
|
|
* PAM modules may have set.
|
|
* Call *after* opening session!
|
|
*/
|
|
if (pamh) {
|
|
environ_pam = pam_getenvlist(pamh);
|
|
if (environ_pam)
|
|
export_pam_environment();
|
|
}
|
|
|
|
/*
|
|
* We must fork() before setuid() because we need to call
|
|
* pam_close_session() as root.
|
|
*/
|
|
pid = fork();
|
|
if (pid < 0) {
|
|
err(1, "fork");
|
|
PAM_END;
|
|
exit(0);
|
|
} else if (pid) {
|
|
/* parent - wait for child to finish, then cleanup
|
|
session */
|
|
wait(NULL);
|
|
PAM_END;
|
|
exit(0);
|
|
} else {
|
|
if ((e = pam_end(pamh, PAM_DATA_SILENT)) != PAM_SUCCESS)
|
|
syslog(LOG_ERR, "pam_end: %s",
|
|
pam_strerror(pamh, e));
|
|
}
|
|
}
|
|
#endif /* NO_PAM */
|
|
|
|
/*
|
|
* 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|LOGIN_SETGROUP)) != 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) {
|
|
const 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);
|
|
|
|
if (login_getcapbool(lc, "nocheckmail", 0) == 0) {
|
|
/* $MAIL may have been set by class. */
|
|
cw = getenv("MAIL");
|
|
if (cw != NULL)
|
|
strlcpy(tbuf, cw, sizeof(tbuf));
|
|
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);
|
|
|
|
/*
|
|
* Login shells have a leading '-' in front of argv[0]
|
|
*/
|
|
if ((u_int)snprintf(tbuf, sizeof(tbuf), "-%s",
|
|
(p = strrchr(pwd->pw_shell, '/')) ? p + 1 : pwd->pw_shell) >=
|
|
sizeof(tbuf)) {
|
|
syslog(LOG_ERR, "user: %s: shell exceeds maximum pathname size",
|
|
username);
|
|
errx(1, "shell exceeds maximum pathname size");
|
|
}
|
|
|
|
execlp(shell, tbuf, (char *)0);
|
|
err(1, "%s", shell);
|
|
}
|
|
|
|
static int
|
|
auth_traditional()
|
|
{
|
|
int rval;
|
|
char *p;
|
|
const char *ep;
|
|
const char *salt;
|
|
|
|
rval = 1;
|
|
salt = pwd != NULL ? pwd->pw_passwd : "xx";
|
|
|
|
p = getpass(passwd_prompt);
|
|
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()
|
|
{
|
|
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)
|
|
gethostname(full_hostname, sizeof full_hostname);
|
|
if ((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, "pam_authenticate: %s", pam_strerror(pamh, e));
|
|
rval = -1;
|
|
break;
|
|
}
|
|
|
|
if (rval == 0) {
|
|
e = pam_acct_mgmt(pamh, 0);
|
|
if (e == PAM_NEW_AUTHTOK_REQD) {
|
|
e = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK);
|
|
if (e != PAM_SUCCESS) {
|
|
syslog(LOG_ERR, "pam_chauthtok: %s",
|
|
pam_strerror(pamh, e));
|
|
rval = 1;
|
|
}
|
|
} else if (e != PAM_SUCCESS) {
|
|
rval = 1;
|
|
}
|
|
}
|
|
|
|
if (rval != 0) {
|
|
if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
|
|
syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
|
|
}
|
|
pamh = NULL;
|
|
}
|
|
return rval;
|
|
}
|
|
|
|
static int
|
|
export_pam_environment()
|
|
{
|
|
char **pp;
|
|
|
|
for (pp = environ_pam; *pp != NULL; pp++) {
|
|
if (ok_to_export(*pp))
|
|
(void) putenv(*pp);
|
|
free(*pp);
|
|
}
|
|
return PAM_SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* Sanity checks on PAM environmental variables:
|
|
* - Make sure there is an '=' in the string.
|
|
* - Make sure the string doesn't run on too long.
|
|
* - Do not export certain variables. This list was taken from the
|
|
* Solaris pam_putenv(3) man page.
|
|
*/
|
|
static int
|
|
ok_to_export(s)
|
|
const char *s;
|
|
{
|
|
static const char *noexport[] = {
|
|
"SHELL", "HOME", "LOGNAME", "MAIL", "CDPATH",
|
|
"IFS", "PATH", NULL
|
|
};
|
|
const char **pp;
|
|
size_t n;
|
|
|
|
if (strlen(s) > 1024 || strchr(s, '=') == NULL)
|
|
return 0;
|
|
if (strncmp(s, "LD_", 3) == 0)
|
|
return 0;
|
|
for (pp = noexport; *pp != NULL; pp++) {
|
|
n = strlen(*pp);
|
|
if (s[n] == '=' && strncmp(s, *pp, n) == 0)
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
#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
|
|
*/
|
|
|
|
void
|
|
getloginname()
|
|
{
|
|
int ch;
|
|
char *p;
|
|
static char nbuf[NBUFSIZ];
|
|
|
|
for (;;) {
|
|
(void)printf("%s", prompt);
|
|
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;
|
|
|
|
void
|
|
sigint(signo)
|
|
int signo __unused;
|
|
{
|
|
motdinterrupt = 1;
|
|
}
|
|
|
|
void
|
|
motd(motdfile)
|
|
const 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);
|
|
} else {
|
|
syslog(LOG_ERR, "cannot open %s: %m", _PATH_LASTLOG);
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
const char *
|
|
stypeof(ttyid)
|
|
char *ttyid;
|
|
{
|
|
struct ttyent *t;
|
|
|
|
if (ttyid != NULL && *ttyid != '\0') {
|
|
t = getttynam(ttyid);
|
|
if (t != NULL && t->ty_type != NULL)
|
|
return (t->ty_type);
|
|
}
|
|
return (UNKNOWN);
|
|
}
|
|
|
|
void
|
|
refused(msg, rtype, lout)
|
|
const char *msg;
|
|
const 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);
|
|
}
|