system_cmds-336.23.tar.gz

[apple/system_cmds.git] / chpass.tproj / chpass.c

/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
 * Reserved.  This file contains Original Code and/or Modifications of
 * Original Code as defined in and that are subject to the Apple Public
 * Source License Version 1.0 (the 'License').  You may not use this file
 * except in compliance with the License.  Please obtain a copy of the
 * License at http://www.apple.com/publicsource and read it before using
 * this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License."
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*-
 * Copyright (c) 1990, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1988, 1993, 1994\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#include <sys/param.h>
#include <sys/stat.h>
#include <sys/signal.h>
#include <sys/time.h>
#include <sys/resource.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <pw_scan.h>
#include <pw_util.h>
#include "pw_copy.h"

#include "chpass.h"
#include "pathnames.h"
#ifdef DIRECTORY_SERVICE
#include "directory_service.h"

#define	PWSETFIELD(field, in, out)	if(in->field) out.field = strdup(in->field)
#endif /* DIRECTORY_SERVICE */

char *progname = "chpass";
char *tempname;
uid_t uid;
#ifdef DIRECTORY_SERVICE
int dswhere;
#endif /* DIRECTORY_SERVICE */

void	baduser __P((void));
void	usage __P((void));

int
main(argc, argv)
	int argc;
	char **argv;
{
	enum { NEWSH, LOADENTRY, EDITENTRY } op;
	struct passwd *pw, lpw;
	int ch, pfd, tfd;
	char *arg;
#ifdef DIRECTORY_SERVICE
	struct passwd pworig;
	char *task_argv[3] = { NULL };
#endif /* DIRECTORY_SERVICE */

	op = EDITENTRY;
	while ((ch = getopt(argc, argv, "a:s:")) != EOF)
		switch(ch) {
		case 'a':
			op = LOADENTRY;
			arg = optarg;
			break;
		case 's':
			op = NEWSH;
			arg = optarg;
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	uid = getuid();

	if (op == EDITENTRY || op == NEWSH)
#ifdef DIRECTORY_SERVICE
	{
#endif /* DIRECTORY_SERVICE */
		switch(argc) {
		case 0:
			if (!(pw = getpwuid(uid)))
				errx(1, "unknown user: uid %u", uid);
			break;
		case 1:
			if (!(pw = getpwnam(*argv)))
				errx(1, "unknown user: %s", *argv);
#ifndef DIRECTORY_SERVICE
			if (uid && uid != pw->pw_uid)
				baduser();
#endif /* DIRECTORY_SERVICE */
			break;
		default:
			usage();
		}

		/* getpwnam(3) returns a pointer to local storage */
		lpw = *pw;
		PWSETFIELD(pw_name, pw, lpw);
		PWSETFIELD(pw_passwd, pw, lpw);
		PWSETFIELD(pw_class, pw, lpw);
		PWSETFIELD(pw_gecos, pw, lpw);
		PWSETFIELD(pw_dir, pw, lpw);
		PWSETFIELD(pw_shell, pw, lpw);

		pw = &lpw;

#ifdef DIRECTORY_SERVICE
		if ((dswhere = wherepwent(pw->pw_name)) < 0) {
			if(dswhere > E_NOTFOUND)
				errc(1, dswhere, "wherepwent");
			else
				errx(1, "wherepwent returned %d", dswhere);
		}
		switch(dswhere) {
		case WHERE_REMOTENI:
			errx(1,
"Can't change info for user \"%s\", which resides in the\n"
"netinfo domain \"%s\"",
			 pw->pw_name, DSPath);
		case WHERE_DS:
			errx(1,
"Can't change info for user \"%s\", which resides in the\n"
"Directory Service path \"%s\"",
			 pw->pw_name, DSPath);
		case WHERE_NIS:
			errx(1,
"Can't change info for user \"%s\", which resides in NIS",
			 pw->pw_name);
		case WHERE_LOCALNI:
			pworig = *pw;
			PWSETFIELD(pw_name, pw, pworig);
			PWSETFIELD(pw_passwd, pw, pworig);
			PWSETFIELD(pw_class, pw, pworig);
			PWSETFIELD(pw_gecos, pw, pworig);
			PWSETFIELD(pw_dir, pw, pworig);
			PWSETFIELD(pw_shell, pw, pworig);
			/* drop through */
		default:
			if (uid && uid != pw->pw_uid)
				baduser();
		}
	}
#endif /* DIRECTORY_SERVICE */

	if (op == NEWSH) {
		/* protect p_shell -- it thinks NULL is /bin/sh */
		if (!arg[0])
			usage();
		if (p_shell(arg, pw, (ENTRY *)NULL))
			pw_error((char *)NULL, 0, 1);
	}

	if (op == LOADENTRY) {
#ifdef DIRECTORY_SERVICE
		warnx("-a is only supported for %s", MasterPasswd);
		dswhere = WHERE_FILES;
#endif /* DIRECTORY_SERVICE */
		if (uid)
			baduser();
		pw = &lpw;
		if (!pw_scan(arg, pw, NULL))
			exit(1);
	}

	/*
	 * The temporary file/file descriptor usage is a little tricky here.
	 * 1:	We start off with two fd's, one for the master password
	 *	file (used to lock everything), and one for a temporary file.
	 * 2:	Display() gets an fp for the temporary file, and copies the
	 *	user's information into it.  It then gives the temporary file
	 *	to the user and closes the fp, closing the underlying fd.
	 * 3:	The user edits the temporary file some number of times.
	 * 4:	Verify() gets an fp for the temporary file, and verifies the
	 *	contents.  It can't use an fp derived from the step #2 fd,
	 *	because the user's editor may have created a new instance of
	 *	the file.  Once the file is verified, its contents are stored
	 *	in a password structure.  The verify routine closes the fp,
	 *	closing the underlying fd.
	 * 5:	Delete the temporary file.
	 * 6:	Get a new temporary file/fd.  Pw_copy() gets an fp for it
	 *	file and copies the master password file into it, replacing
	 *	the user record with a new one.  We can't use the first
	 *	temporary file for this because it was owned by the user.
	 *	Pw_copy() closes its fp, flushing the data and closing the
	 *	underlying file descriptor.  We can't close the master
	 *	password fp, or we'd lose the lock.
	 * 7:	Call pw_mkdb() (which renames the temporary file) and exit.
	 *	The exit closes the master passwd fp/fd.
	 */
	pw_init();
#ifdef DIRECTORY_SERVICE
	if (dswhere == WHERE_FILES)
#endif /* DIRECTORY_SERVICE */
		pfd = pw_lock();
	tfd = pw_tmp();

	if (op == EDITENTRY) {
#ifdef DIRECTORY_SERVICE
		setrestricted(dswhere, pw);
#endif /* DIRECTORY_SERVICE */
		display(tfd, pw);
		edit(pw);
		(void)unlink(tempname);
#ifdef DIRECTORY_SERVICE
		if (dswhere == WHERE_FILES)
#endif /* DIRECTORY_SERVICE */
			tfd = pw_tmp();
	}
		
#ifdef DIRECTORY_SERVICE
	switch (dswhere) {
	case WHERE_LOCALNI:
		update_local_ni(&pworig, pw);
		break;
	case WHERE_FILES:
#endif /* DIRECTORY_SERVICE */
		pw_copy(pfd, tfd, pw);

		if (pw_mkdb() != 0)
			pw_error((char *)NULL, 0, 1);
#ifdef DIRECTORY_SERVICE
	}
	task_argv[0] = "/usr/sbin/lookupd";
	task_argv[1] = "-flushcache";
	task_argv[2] = NULL;
	LaunchTaskWithPipes( task_argv[0], task_argv, NULL, NULL );
#endif /* DIRECTORY_SERVICE */
	exit(0);
}

#ifdef DIRECTORY_SERVICE
// read from 0
int LaunchTaskWithPipes(const char *path, char *const argv[], int *outPipe0, int *outPipe1)
{
	int outputPipe[2];
	pid_t pid;
	
	if (outPipe0 != NULL)
		pipe(outputPipe);
	
	pid = fork();
	if (pid == -1)
		return -1;
	
	/* Handle the child */
	if (pid == 0)
	{
		int result = -1;
	
		if (outPipe0 != NULL)
			dup2(outputPipe[1], fileno(stdout));
		
		result = execv(path, argv);
		if (result == -1) {
			_exit(1);
		}
		
		/* This should never be reached */
		_exit(1);
	}
	
	/* Now the parent */
	if ( outPipe0 != NULL )
		*outPipe0 = outputPipe[0];
	if ( outPipe1 != NULL )
		*outPipe1 = outputPipe[1];

	return 0;
}
#endif /* DIRECTORY_SERVICE */

void
baduser()
{

	errx(1, "%s", strerror(EACCES));
}

void
usage()
{

	(void)fprintf(stderr, "usage: chpass [-a list] [-s shell] [user]\n");
	exit(1);
}