693 lines
16 KiB
C
693 lines
16 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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*
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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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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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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 /* not lint */
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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/param.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/file.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 <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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#ifdef SKEY
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#include <skey.h>
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#endif
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#include "pathnames.h"
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void badlogin __P((char *));
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void checknologin __P((void));
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void dolastlog __P((int));
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void getloginname __P((void));
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void motd __P((void));
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int rootterm __P((char *));
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void sigint __P((int));
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void sleepexit __P((int));
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char *stypeof __P((char *));
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void timedout __P((int));
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void login_fbtab __P((char *, uid_t, gid_t));
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#ifdef KERBEROS
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int klogin __P((struct passwd *, char *, char *, char *));
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#endif
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extern void login __P((struct utmp *));
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#define TTYGRPNAME "tty" /* name of group to own ttys */
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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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#ifdef KERBEROS
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int notickets = 1;
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int noticketsdontcomplain = 1;
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char *instance;
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char *krbtkfile_env;
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int authok;
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#endif
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struct passwd *pwd;
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int failures;
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char term[64], *envinit[1], *hostname, *username, *tty;
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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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extern char **environ;
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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 ask, ch, cnt, fflag, hflag, pflag, quietlog, rootlogin, rval;
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int changepass;
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uid_t uid;
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char *domain, *p, *ep, *salt, *ttyn;
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char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10];
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char localhost[MAXHOSTNAMELEN];
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#ifdef SKEY
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int permit_passwd = 0;
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#endif
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(void)signal(SIGALRM, timedout);
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(void)alarm(timeout);
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(void)signal(SIGQUIT, SIG_IGN);
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(void)signal(SIGINT, SIG_IGN);
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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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domain = NULL;
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if (gethostname(localhost, sizeof(localhost)) < 0)
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syslog(LOG_ERR, "couldn't get local hostname: %m");
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else
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domain = strchr(localhost, '.');
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fflag = hflag = pflag = 0;
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uid = getuid();
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while ((ch = getopt(argc, argv, "fh:p")) != EOF)
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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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strncpy(full_hostname, optarg, sizeof(full_hostname)-1);
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if (domain && (p = strchr(optarg, '.')) &&
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strcasecmp(p, domain) == 0)
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*p = 0;
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if (strlen(optarg) > UT_HOSTSIZE) {
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struct hostent *hp = gethostbyname(optarg);
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if (hp != NULL) {
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struct in_addr in;
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memmove(&in, hp->h_addr, sizeof(in));
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optarg = strdup(inet_ntoa(in));
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} else
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optarg = "invalid hostname";
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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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(void)fprintf(stderr,
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"usage: login [-fp] [-h hostname] [username]\n");
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exit(1);
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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, '/'))
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++tty;
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else
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tty = ttyn;
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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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#ifdef KERBEROS
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if ((instance = strchr(username, '.')) != NULL) {
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if (strncmp(instance, ".root", 5) == 0)
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rootlogin = 1;
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*instance++ = '\0';
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} else
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instance = "";
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#endif
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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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failures = 0;
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}
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(void)strcpy(tbuf, username);
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if (pwd = getpwnam(username))
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salt = pwd->pw_passwd;
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else
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salt = "xx";
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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) {
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if (pwd->pw_uid == 0)
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rootlogin = 1;
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if (fflag && (uid == 0 || uid == 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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/* 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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fflag = 0;
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(void)setpriority(PRIO_PROCESS, 0, -4);
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#ifdef SKEY
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permit_passwd = skeyaccess(username, tty,
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hostname ? full_hostname : NULL,
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NULL);
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p = skey_getpass("Password:", pwd, permit_passwd);
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ep = skey_crypt(p, salt, pwd, permit_passwd);
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#else
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p = getpass("Password:");
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ep = crypt(p, salt);
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#endif
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if (pwd) {
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#ifdef KERBEROS
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#ifdef SKEY
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/*
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* Do not allow user to type in kerberos password
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* over the net (actually, this is ok for encrypted
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* links, but we have no way of determining if the
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* link is encrypted.
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*/
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if (!permit_passwd) {
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rval = 1; /* failed */
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} else
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#endif
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rval = klogin(pwd, instance, localhost, p);
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if (rval != 0 && rootlogin && pwd->pw_uid != 0)
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rootlogin = 0;
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if (rval == 0)
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authok = 1;
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else if (rval == 1)
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rval = strcmp(ep, pwd->pw_passwd);
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#else
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rval = strcmp(ep, pwd->pw_passwd);
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#endif
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}
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memset(p, 0, strlen(p));
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(void)setpriority(PRIO_PROCESS, 0, 0);
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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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#ifdef KERBEROS
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if (authok == 0)
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#endif
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if (pwd && !rval && rootlogin && !rootterm(tty)) {
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(void)fprintf(stderr,
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"%s login refused on this terminal.\n",
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pwd->pw_name);
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if (hostname)
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syslog(LOG_NOTICE,
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"LOGIN %s REFUSED FROM %s ON TTY %s",
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pwd->pw_name, full_hostname, tty);
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else
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syslog(LOG_NOTICE,
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"LOGIN %s REFUSED ON TTY %s",
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pwd->pw_name, tty);
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continue;
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}
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if (pwd && !rval)
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break;
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(void)printf("Login incorrect\n");
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failures++;
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/* we allow 10 tries, but after 3 we start backing off */
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if (++cnt > 3) {
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if (cnt >= 10) {
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badlogin(username);
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sleepexit(1);
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}
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sleep((u_int)((cnt - 3) * 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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endpwent();
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/* if user not super-user, check for disabled logins */
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if (!rootlogin)
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checknologin();
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if (chdir(pwd->pw_dir) < 0) {
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(void)printf("No home directory %s!\n", pwd->pw_dir);
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if (chdir("/"))
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exit(0);
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pwd->pw_dir = "/";
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(void)printf("Logging in with home = \"/\".\n");
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}
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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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changepass=0;
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if (pwd->pw_change)
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if (tp.tv_sec >= pwd->pw_change) {
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(void)printf("Sorry -- your password has expired.\n");
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changepass=1;
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} else if (pwd->pw_change - tp.tv_sec <
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2 * 7 * 86400 && !quietlog)
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(void)printf("Warning: your password expires on %s",
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ctime(&pwd->pw_change));
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if (pwd->pw_expire)
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if (tp.tv_sec >= pwd->pw_expire) {
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(void)printf("Sorry -- your account has expired.\n");
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sleepexit(1);
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} else if (pwd->pw_expire - tp.tv_sec <
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2 * 7 * 86400 && !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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/* 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);
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(void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name));
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if (hostname)
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(void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host));
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(void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line));
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login(&utmp);
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dolastlog(quietlog);
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/*
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* Set device protections, depending on what terminal the
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* user is logged in. This feature is used on Suns to give
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* console users better privacy.
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*/
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login_fbtab(tty, pwd->pw_uid, pwd->pw_gid);
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(void)chown(ttyn, pwd->pw_uid,
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(gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid);
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(void)setgid(pwd->pw_gid);
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initgroups(username, pwd->pw_gid);
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if (*pwd->pw_shell == '\0')
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pwd->pw_shell = _PATH_BSHELL;
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/* Destroy environment unless user has requested its preservation. */
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if (!pflag)
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environ = envinit;
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(void)setenv("HOME", pwd->pw_dir, 1);
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(void)setenv("SHELL", pwd->pw_shell, 1);
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if (term[0] == '\0')
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(void)strncpy(term, stypeof(tty), sizeof(term));
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(void)setenv("TERM", term, 0);
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(void)setenv("LOGNAME", pwd->pw_name, 1);
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(void)setenv("USER", pwd->pw_name, 1);
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(void)setenv("PATH", _PATH_DEFPATH, 0);
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#ifdef KERBEROS
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if (krbtkfile_env)
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(void)setenv("KRBTKFILE", krbtkfile_env, 1);
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#endif
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if (tty[sizeof("tty")-1] == 'd')
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syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name);
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/* If fflag is on, assume caller/authenticator has logged root login. */
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if (rootlogin && fflag == 0)
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if (hostname)
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syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s",
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username, tty, full_hostname);
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else
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syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", username, tty);
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#ifdef KERBEROS
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if (!quietlog && notickets == 1 && !noticketsdontcomplain)
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(void)printf("Warning: no Kerberos tickets issued.\n");
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#endif
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#ifdef LOGALL
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/*
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* Syslog each successful login, so we don't have to watch hundreds
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* of wtmp or lastlogin files.
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*/
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if (hostname) {
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syslog(LOG_INFO, "login from %s as %s", full_hostname, pwd->pw_name);
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} else {
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syslog(LOG_INFO, "login on %s as %s", tty, pwd->pw_name);
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}
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#endif
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if (!quietlog) {
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(void)printf("%s\n\t%s %s\n\n",
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"Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994",
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"The Regents of the University of California. ",
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"All rights reserved.");
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motd();
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(void)snprintf(tbuf,
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sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pwd->pw_name);
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if (stat(tbuf, &st) == 0 && st.st_size != 0)
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(void)printf("You have %smail.\n",
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(st.st_mtime > st.st_atime) ? "new " : "");
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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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printf("Permission denied\n");
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if (hostname)
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syslog(LOG_NOTICE, "%s LOGIN REFUSED FROM %s",
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pwd->pw_name, full_hostname);
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else
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syslog(LOG_NOTICE, "%s LOGIN REFUSED ON %s",
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pwd->pw_name, tty);
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sleepexit(1);
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}
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#endif
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(void)signal(SIGALRM, SIG_DFL);
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(void)signal(SIGQUIT, SIG_DFL);
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(void)signal(SIGINT, SIG_DFL);
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(void)signal(SIGTSTP, SIG_IGN);
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tbuf[0] = '-';
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(void)strcpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ?
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p + 1 : pwd->pw_shell);
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if (setlogin(pwd->pw_name) < 0)
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syslog(LOG_ERR, "setlogin() failure: %m");
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/* Discard permissions last so can't get killed and drop core. */
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if (rootlogin)
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(void) setuid(0);
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else
|
|
(void) setuid(pwd->pw_uid);
|
|
|
|
if (changepass) {
|
|
int res;
|
|
if ((res=system(_PATH_CHPASS)))
|
|
sleepexit(1);
|
|
}
|
|
|
|
execlp(pwd->pw_shell, tbuf, 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()
|
|
{
|
|
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);
|
|
}
|
|
|
|
jmp_buf motdinterrupt;
|
|
|
|
void
|
|
motd()
|
|
{
|
|
int fd, nchars;
|
|
sig_t oldint;
|
|
char tbuf[8192];
|
|
|
|
if ((fd = open(_PATH_MOTDFILE, O_RDONLY, 0)) < 0)
|
|
return;
|
|
oldint = signal(SIGINT, sigint);
|
|
if (setjmp(motdinterrupt) == 0)
|
|
while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0)
|
|
(void)write(fileno(stdout), tbuf, nchars);
|
|
(void)signal(SIGINT, oldint);
|
|
(void)close(fd);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
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()
|
|
{
|
|
int fd, nchars;
|
|
char tbuf[8192];
|
|
|
|
if ((fd = open(_PATH_NOLOGIN, O_RDONLY, 0)) >= 0) {
|
|
while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0)
|
|
(void)write(fileno(stdout), tbuf, nchars);
|
|
sleepexit(0);
|
|
}
|
|
}
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
#undef UNKNOWN
|
|
#define UNKNOWN "su"
|
|
|
|
char *
|
|
stypeof(ttyid)
|
|
char *ttyid;
|
|
{
|
|
struct ttyent *t;
|
|
|
|
return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : UNKNOWN);
|
|
}
|
|
|
|
void
|
|
sleepexit(eval)
|
|
int eval;
|
|
{
|
|
|
|
(void)sleep(5);
|
|
exit(eval);
|
|
}
|
|
|
|
|