744 lines
17 KiB
C
744 lines
17 KiB
C
/* $NetBSD: su.c,v 1.57 2003/08/20 14:11:17 christos Exp $ */
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/*
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* Copyright (c) 1988 The Regents of the University of California.
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* 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. 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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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT(
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"@(#) Copyright (c) 1988 The Regents of the University of California.\n\
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All rights reserved.\n");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)su.c 8.3 (Berkeley) 4/2/94";*/
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#else
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__RCSID("$NetBSD: su.c,v 1.57 2003/08/20 14:11:17 christos Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/resource.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 <paths.h>
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#include <pwd.h>
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#include <stdio.h>
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#ifdef SKEY
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#include <skey.h>
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#endif
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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 <time.h>
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#include <tzfile.h>
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#include <unistd.h>
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#ifdef LOGIN_CAP
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#include <login_cap.h>
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#endif
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#ifdef KERBEROS
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#include <des.h>
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#include <krb.h>
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#include <netdb.h>
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static int kerberos __P((char *, char *, int));
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static int koktologin __P((char *, char *, char *));
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#endif
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#ifdef KERBEROS5
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#include <krb5.h>
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static int kerberos5 __P((char *, char *, int));
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#endif
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#if defined(KERBEROS) || defined(KERBEROS5)
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#define ARGSTRX "-Kdflm"
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int use_kerberos = 1;
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#else
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#define ARGSTRX "-dflm"
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#endif
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#ifndef SU_GROUP
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#define SU_GROUP "wheel"
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#endif
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#ifdef LOGIN_CAP
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#define ARGSTR ARGSTRX "c:"
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#else
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#define ARGSTR ARGSTRX
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#endif
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int main __P((int, char **));
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static int chshell __P((const char *));
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static char *ontty __P((void));
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static int check_ingroup __P((int, const char *, const char *, int));
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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 passwd *pwd;
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char *p;
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#ifdef BSD4_4
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struct timeval tp;
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#endif
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uid_t ruid;
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int asme, ch, asthem, fastlogin, prio, gohome;
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enum { UNSET, YES, NO } iscsh = UNSET;
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char *user, *shell, *avshell, *username, **np;
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char *userpass, *class;
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char shellbuf[MAXPATHLEN], avshellbuf[MAXPATHLEN];
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time_t pw_warntime = _PASSWORD_WARNDAYS * SECSPERDAY;
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#ifdef LOGIN_CAP
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login_cap_t *lc;
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#endif
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asme = asthem = fastlogin = 0;
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gohome = 1;
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shell = class = NULL;
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while ((ch = getopt(argc, argv, ARGSTR)) != -1)
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switch((char)ch) {
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#if defined(KERBEROS) || defined(KERBEROS5)
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case 'K':
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use_kerberos = 0;
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break;
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#endif
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#ifdef LOGIN_CAP
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case 'c':
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class = optarg;
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break;
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#endif
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case 'd':
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asme = 0;
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asthem = 1;
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gohome = 0;
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break;
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case 'f':
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fastlogin = 1;
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break;
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case '-':
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case 'l':
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asme = 0;
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asthem = 1;
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break;
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case 'm':
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asme = 1;
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asthem = 0;
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break;
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case '?':
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default:
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(void)fprintf(stderr,
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"Usage: %s [%s] [login [shell arguments]]\n",
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getprogname(), ARGSTR);
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exit(1);
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}
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argv += optind;
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/* Lower the priority so su runs faster */
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errno = 0;
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prio = getpriority(PRIO_PROCESS, 0);
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if (errno)
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prio = 0;
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if (prio > -2)
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(void)setpriority(PRIO_PROCESS, 0, -2);
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openlog("su", 0, LOG_AUTH);
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/* get current login name and shell */
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ruid = getuid();
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username = getlogin();
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if (username == NULL || (pwd = getpwnam(username)) == NULL ||
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pwd->pw_uid != ruid)
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pwd = getpwuid(ruid);
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if (pwd == NULL)
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errx(1, "who are you?");
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username = strdup(pwd->pw_name);
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userpass = strdup(pwd->pw_passwd);
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if (username == NULL || userpass == NULL)
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err(1, "strdup");
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if (asme) {
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if (pwd->pw_shell && *pwd->pw_shell) {
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strlcpy(shellbuf, pwd->pw_shell, sizeof(shellbuf));
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shell = shellbuf;
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} else {
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shell = _PATH_BSHELL;
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iscsh = NO;
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}
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}
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/* get target login information, default to root */
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user = *argv ? *argv : "root";
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np = *argv ? argv : argv-1;
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if ((pwd = getpwnam(user)) == NULL)
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errx(1, "unknown login %s", user);
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#ifdef LOGIN_CAP
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/* force the usage of specified class */
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if (class) {
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if (ruid)
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errx(1, "Only root may use -c");
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pwd->pw_class = class;
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}
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lc = login_getclass(pwd->pw_class);
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pw_warntime = login_getcaptime(lc, "password-warn",
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_PASSWORD_WARNDAYS * SECSPERDAY,
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_PASSWORD_WARNDAYS * SECSPERDAY);
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#endif
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if (ruid
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#ifdef KERBEROS5
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&& (!use_kerberos || kerberos5(username, user, pwd->pw_uid))
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#endif
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#ifdef KERBEROS
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&& (!use_kerberos || kerberos(username, user, pwd->pw_uid))
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#endif
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) {
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char *pass = pwd->pw_passwd;
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int ok = pwd->pw_uid != 0;
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#ifdef SU_ROOTAUTH
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/*
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* Allow those in group rootauth to su to root, by supplying
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* their own password.
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*/
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if (!ok) {
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if ((ok = check_ingroup(-1, SU_ROOTAUTH, username, 0))) {
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pass = userpass;
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user = username;
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}
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}
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#endif
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/*
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* Only allow those in group SU_GROUP to su to root,
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* but only if that group has any members.
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* If SU_GROUP has no members, allow anyone to su root
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*/
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if (!ok) {
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ok = check_ingroup(-1, SU_GROUP, username, 1);
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}
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if (!ok)
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errx(1,
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"you are not listed in the correct secondary group (%s) to su %s.",
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SU_GROUP, user);
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/* if target requires a password, verify it */
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if (*pass) {
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p = getpass("Password:");
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#ifdef SKEY
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if (strcasecmp(p, "s/key") == 0) {
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if (skey_haskey(user))
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errx(1, "Sorry, you have no s/key.");
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else {
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if (skey_authenticate(user)) {
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goto badlogin;
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}
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}
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} else
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#endif
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if (strcmp(pass, crypt(p, pass))) {
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#ifdef SKEY
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badlogin:
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#endif
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fprintf(stderr, "Sorry\n");
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syslog(LOG_WARNING,
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"BAD SU %s to %s%s", username,
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pwd->pw_name, ontty());
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exit(1);
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}
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}
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}
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if (asme) {
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/* if asme and non-standard target shell, must be root */
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if (!chshell(pwd->pw_shell) && ruid)
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errx(1,"permission denied (shell).");
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} else if (pwd->pw_shell && *pwd->pw_shell) {
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shell = pwd->pw_shell;
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iscsh = UNSET;
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} else {
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shell = _PATH_BSHELL;
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iscsh = NO;
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}
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if ((p = strrchr(shell, '/')) != NULL)
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avshell = p+1;
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else
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avshell = shell;
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/* if we're forking a csh, we want to slightly muck the args */
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if (iscsh == UNSET)
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iscsh = strstr(avshell, "csh") ? YES : NO;
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/* set permissions */
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#ifdef LOGIN_CAP
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if (setusercontext(lc, pwd, pwd->pw_uid,
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(asthem ? (LOGIN_SETPRIORITY | LOGIN_SETUMASK) : 0) |
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LOGIN_SETRESOURCES | LOGIN_SETGROUP | LOGIN_SETUSER))
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err(1, "setting user context");
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#else
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if (setgid(pwd->pw_gid) < 0)
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err(1, "setgid");
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if (initgroups(user, pwd->pw_gid))
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errx(1, "initgroups failed");
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if (setuid(pwd->pw_uid) < 0)
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err(1, "setuid");
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#endif
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if (!asme) {
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if (asthem) {
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p = getenv("TERM");
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/* Create an empty environment */
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if ((environ = malloc(sizeof(char *))) == NULL)
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err(1, NULL);
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environ[0] = NULL;
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#ifdef LOGIN_CAP
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if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETPATH))
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err(1, "setting user context");
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#else
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(void)setenv("PATH", _PATH_DEFPATH, 1);
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#endif
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if (p)
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(void)setenv("TERM", p, 1);
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if (gohome && chdir(pwd->pw_dir) < 0)
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errx(1, "no directory");
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}
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if (asthem || pwd->pw_uid)
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(void)setenv("USER", pwd->pw_name, 1);
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(void)setenv("HOME", pwd->pw_dir, 1);
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(void)setenv("SHELL", shell, 1);
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}
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(void)setenv("SU_FROM", username, 1);
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if (iscsh == YES) {
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if (fastlogin)
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*np-- = "-f";
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if (asme)
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*np-- = "-m";
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} else {
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if (fastlogin)
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unsetenv("ENV");
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}
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if (asthem) {
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avshellbuf[0] = '-';
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(void)strlcpy(avshellbuf+1, avshell, sizeof(avshellbuf) - 1);
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avshell = avshellbuf;
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} else if (iscsh == YES) {
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/* csh strips the first character... */
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avshellbuf[0] = '_';
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(void)strlcpy(avshellbuf+1, avshell, sizeof(avshellbuf) - 1);
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avshell = avshellbuf;
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}
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*np = avshell;
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#ifdef BSD4_4
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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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if (pwd->pw_change) {
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if (tp.tv_sec >= pwd->pw_change) {
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(void)printf("%s -- %s's password has expired.\n",
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(ruid ? "Sorry" : "Note"), user);
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if (ruid != 0)
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exit(1);
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} else if (pwd->pw_change - tp.tv_sec < pw_warntime)
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(void)printf("Warning: %s's password expires on %s",
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user, ctime(&pwd->pw_change));
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}
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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("%s -- %s's account has expired.\n",
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(ruid ? "Sorry" : "Note"), user);
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if (ruid != 0)
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exit(1);
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} else if (pwd->pw_expire - tp.tv_sec <
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_PASSWORD_WARNDAYS * SECSPERDAY)
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(void)printf("Warning: %s's account expires on %s",
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user, ctime(&pwd->pw_expire));
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}
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#endif
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if (ruid != 0)
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syslog(LOG_NOTICE, "%s to %s%s",
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username, pwd->pw_name, ontty());
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/* Raise our priority back to what we had before */
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(void)setpriority(PRIO_PROCESS, 0, prio);
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execv(shell, np);
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err(1, "%s", shell);
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/* NOTREACHED */
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}
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static int
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chshell(sh)
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const char *sh;
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{
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const char *cp;
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setusershell();
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while ((cp = getusershell()) != NULL)
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if (!strcmp(cp, sh))
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return (1);
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return (0);
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}
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static char *
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ontty()
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{
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char *p;
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static char buf[MAXPATHLEN + 4];
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buf[0] = 0;
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if ((p = ttyname(STDERR_FILENO)) != NULL)
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(void)snprintf(buf, sizeof buf, " on %s", p);
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return (buf);
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}
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#ifdef KERBEROS5
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static int
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kerberos5(username, user, uid)
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char *username, *user;
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int uid;
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{
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krb5_error_code ret;
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krb5_context context;
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krb5_principal princ = NULL;
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krb5_ccache ccache, ccache2;
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char *cc_name;
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const char *filename;
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ret = krb5_init_context(&context);
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if (ret)
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return (1);
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if (strcmp (user, "root") == 0)
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ret = krb5_make_principal(context, &princ,
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NULL, username, "root", NULL);
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else
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ret = krb5_make_principal(context, &princ,
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NULL, user, NULL);
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if (ret)
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goto fail;
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if (!krb5_kuserok(context, princ, user) && !uid) {
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warnx ("kerberos5: not in %s's ACL.", user);
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goto fail;
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}
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ret = krb5_cc_gen_new(context, &krb5_mcc_ops, &ccache);
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if (ret)
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goto fail;
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ret = krb5_verify_user_lrealm(context, princ, ccache, NULL, TRUE,
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NULL);
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if (ret) {
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krb5_cc_destroy(context, ccache);
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switch (ret) {
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case KRB5_LIBOS_PWDINTR :
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break;
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case KRB5KRB_AP_ERR_BAD_INTEGRITY:
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case KRB5KRB_AP_ERR_MODIFIED:
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krb5_warnx(context, "Password incorrect");
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break;
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default :
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krb5_warn(context, ret, "krb5_verify_user");
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break;
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}
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goto fail;
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}
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ret = krb5_cc_gen_new(context, &krb5_fcc_ops, &ccache2);
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if (ret) {
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krb5_cc_destroy(context, ccache);
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goto fail;
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}
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ret = krb5_cc_copy_cache(context, ccache, ccache2);
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if (ret) {
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krb5_cc_destroy(context, ccache);
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krb5_cc_destroy(context, ccache2);
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goto fail;
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}
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filename = krb5_cc_get_name(context, ccache2);
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asprintf(&cc_name, "%s:%s", krb5_cc_get_type(context, ccache2),
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filename);
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if (chown (filename, uid, -1) < 0) {
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warn("chown %s", filename);
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free(cc_name);
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krb5_cc_destroy(context, ccache);
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krb5_cc_destroy(context, ccache2);
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goto fail;
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}
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setenv("KRB5CCNAME", cc_name, 1);
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free(cc_name);
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krb5_cc_close(context, ccache2);
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krb5_cc_destroy(context, ccache);
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return (0);
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fail:
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if (princ != NULL)
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krb5_free_principal (context, princ);
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krb5_free_context (context);
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return (1);
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}
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#endif
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#ifdef KERBEROS
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static int
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kerberos(username, user, uid)
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char *username, *user;
|
|
int uid;
|
|
{
|
|
KTEXT_ST ticket;
|
|
AUTH_DAT authdata;
|
|
struct hostent *hp;
|
|
int kerno;
|
|
u_long faddr;
|
|
char lrealm[REALM_SZ], krbtkfile[MAXPATHLEN];
|
|
char hostname[MAXHOSTNAMELEN + 1], savehost[MAXHOSTNAMELEN + 1];
|
|
|
|
if (krb_get_lrealm(lrealm, 1) != KSUCCESS)
|
|
return (1);
|
|
if (koktologin(username, lrealm, user) && !uid) {
|
|
warnx("kerberos: not in %s's ACL.", user);
|
|
return (1);
|
|
}
|
|
(void)snprintf(krbtkfile, sizeof krbtkfile, "%s_%s_%d", TKT_ROOT,
|
|
user, getuid());
|
|
|
|
(void)setenv("KRBTKFILE", krbtkfile, 1);
|
|
(void)krb_set_tkt_string(krbtkfile);
|
|
/*
|
|
* Set real as well as effective ID to 0 for the moment,
|
|
* to make the kerberos library do the right thing.
|
|
*/
|
|
if (setuid(0) < 0) {
|
|
warn("setuid");
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Little trick here -- if we are su'ing to root,
|
|
* we need to get a ticket for "xxx.root", where xxx represents
|
|
* the name of the person su'ing. Otherwise (non-root case),
|
|
* we need to get a ticket for "yyy.", where yyy represents
|
|
* the name of the person being su'd to, and the instance is null
|
|
*
|
|
* We should have a way to set the ticket lifetime,
|
|
* with a system default for root.
|
|
*/
|
|
{
|
|
char prompt[128];
|
|
char passw[256];
|
|
|
|
(void)snprintf (prompt, sizeof(prompt),
|
|
"%s's Password: ",
|
|
krb_unparse_name_long ((uid == 0 ? username : user),
|
|
(uid == 0 ? "root" : ""),
|
|
lrealm));
|
|
if (des_read_pw_string (passw, sizeof (passw), prompt, 0)) {
|
|
memset (passw, 0, sizeof (passw));
|
|
return (1);
|
|
}
|
|
if (strlen(passw) == 0)
|
|
return (1); /* Empty passwords are not allowed */
|
|
|
|
kerno = krb_get_pw_in_tkt((uid == 0 ? username : user),
|
|
(uid == 0 ? "root" : ""), lrealm,
|
|
KRB_TICKET_GRANTING_TICKET,
|
|
lrealm,
|
|
DEFAULT_TKT_LIFE,
|
|
passw);
|
|
memset (passw, 0, strlen (passw));
|
|
}
|
|
|
|
if (kerno != KSUCCESS) {
|
|
if (kerno == KDC_PR_UNKNOWN) {
|
|
warnx("kerberos: principal unknown: %s.%s@%s",
|
|
(uid == 0 ? username : user),
|
|
(uid == 0 ? "root" : ""), lrealm);
|
|
return (1);
|
|
}
|
|
warnx("kerberos: unable to su: %s", krb_err_txt[kerno]);
|
|
syslog(LOG_WARNING,
|
|
"BAD Kerberos SU: %s to %s%s: %s",
|
|
username, user, ontty(), krb_err_txt[kerno]);
|
|
return (1);
|
|
}
|
|
|
|
if (chown(krbtkfile, uid, -1) < 0) {
|
|
warn("chown");
|
|
(void)unlink(krbtkfile);
|
|
return (1);
|
|
}
|
|
|
|
(void)setpriority(PRIO_PROCESS, 0, -2);
|
|
|
|
if (gethostname(hostname, sizeof(hostname)) == -1) {
|
|
warn("gethostname");
|
|
dest_tkt();
|
|
return (1);
|
|
}
|
|
hostname[sizeof(hostname) - 1] = '\0';
|
|
|
|
(void)strlcpy(savehost, krb_get_phost(hostname), sizeof(savehost));
|
|
savehost[sizeof(savehost) - 1] = '\0';
|
|
|
|
kerno = krb_mk_req(&ticket, "rcmd", savehost, lrealm, 33);
|
|
|
|
if (kerno == KDC_PR_UNKNOWN) {
|
|
warnx("Warning: TGT not verified.");
|
|
syslog(LOG_WARNING,
|
|
"%s to %s%s, TGT not verified (%s); %s.%s not registered?",
|
|
username, user, ontty(), krb_err_txt[kerno],
|
|
"rcmd", savehost);
|
|
} else if (kerno != KSUCCESS) {
|
|
warnx("Unable to use TGT: %s", krb_err_txt[kerno]);
|
|
syslog(LOG_WARNING, "failed su: %s to %s%s: %s",
|
|
username, user, ontty(), krb_err_txt[kerno]);
|
|
dest_tkt();
|
|
return (1);
|
|
} else {
|
|
if (!(hp = gethostbyname(hostname))) {
|
|
warnx("can't get addr of %s", hostname);
|
|
dest_tkt();
|
|
return (1);
|
|
}
|
|
memmove((char *)&faddr, (char *)hp->h_addr, sizeof(faddr));
|
|
|
|
if ((kerno = krb_rd_req(&ticket, "rcmd", savehost, faddr,
|
|
&authdata, "")) != KSUCCESS) {
|
|
warnx("kerberos: unable to verify rcmd ticket: %s",
|
|
krb_err_txt[kerno]);
|
|
syslog(LOG_WARNING,
|
|
"failed su: %s to %s%s: %s", username,
|
|
user, ontty(), krb_err_txt[kerno]);
|
|
dest_tkt();
|
|
return (1);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
koktologin(name, realm, toname)
|
|
char *name, *realm, *toname;
|
|
{
|
|
return krb_kuserok(name,
|
|
strcmp (toname, "root") == 0 ? "root" : "",
|
|
realm,
|
|
toname);
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
check_ingroup (gid, gname, user, ifempty)
|
|
int gid;
|
|
const char *gname;
|
|
const char *user;
|
|
int ifempty;
|
|
{
|
|
struct group *gr;
|
|
char **g;
|
|
#ifdef SU_INDIRECT_GROUP
|
|
char **gr_mem;
|
|
int n = 0;
|
|
int i = 0;
|
|
#endif
|
|
int ok = 0;
|
|
|
|
if (gname == NULL)
|
|
gr = getgrgid((gid_t) gid);
|
|
else
|
|
gr = getgrnam(gname);
|
|
|
|
/*
|
|
* XXX we are relying on the fact that we only set ifempty when
|
|
* calling to check for SU_GROUP and that is the only time a
|
|
* missing group is acceptable.
|
|
*/
|
|
if (gr == NULL)
|
|
return ifempty;
|
|
if (!*gr->gr_mem) /* empty */
|
|
return ifempty;
|
|
|
|
/*
|
|
* Ok, first see if user is in gr_mem
|
|
*/
|
|
for (g = gr->gr_mem; *g; ++g) {
|
|
if (strcmp(*g, user) == 0)
|
|
return 1; /* ok */
|
|
#ifdef SU_INDIRECT_GROUP
|
|
++n; /* count them */
|
|
#endif
|
|
}
|
|
#ifdef SU_INDIRECT_GROUP
|
|
/*
|
|
* No.
|
|
* Now we need to duplicate the gr_mem list, and recurse for
|
|
* each member to see if it is a group, and if so whether user is
|
|
* in it.
|
|
*/
|
|
gr_mem = malloc((n + 1) * sizeof (char *));
|
|
for (g = gr->gr_mem, i = 0; *g; ++g) {
|
|
gr_mem[i] = strdup(*g);
|
|
if (!gr_mem[i])
|
|
err(1, "strdup");
|
|
i++;
|
|
}
|
|
gr_mem[i++] = NULL;
|
|
|
|
for (g = gr_mem; ok == 0 && *g; ++g) {
|
|
/*
|
|
* If we get this far we don't accept empty/missing groups.
|
|
*/
|
|
ok = check_ingroup(-1, *g, user, 0);
|
|
}
|
|
for (g = gr_mem; *g; ++g) {
|
|
free(*g);
|
|
}
|
|
free(gr_mem);
|
|
#endif
|
|
return ok;
|
|
}
|