245 lines
6.4 KiB
C
245 lines
6.4 KiB
C
/*-
|
|
* Copyright (c) 1988 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
|
|
char copyright[] =
|
|
"@(#) Copyright (c) 1988 The Regents of the University of California.\n\
|
|
All rights reserved.\n";
|
|
#endif /* not lint */
|
|
|
|
#ifndef lint
|
|
/*static char sccsid[] = "from: @(#)chpass.c 5.17 (Berkeley) 3/3/91";*/
|
|
static char rcsid[] = "$Id: chpass.c,v 1.4 1994/08/17 19:54:39 deraadt Exp $";
|
|
#endif /* not lint */
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/signal.h>
|
|
#include <sys/time.h>
|
|
#include <sys/resource.h>
|
|
#include <fcntl.h>
|
|
#include <pwd.h>
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <ctype.h>
|
|
#include <string.h>
|
|
#include "chpass.h"
|
|
#include "pathnames.h"
|
|
|
|
char *progname = "chpass";
|
|
char *tempname;
|
|
uid_t uid;
|
|
|
|
#ifdef YP
|
|
int use_yp;
|
|
int force_yp = 0;
|
|
extern struct passwd *ypgetpwnam(), *ypgetpwuid();
|
|
#endif
|
|
|
|
main(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
extern int optind;
|
|
extern char *optarg;
|
|
register enum { NEWSH, LOADENTRY, EDITENTRY } op;
|
|
register struct passwd *pw;
|
|
struct passwd lpw;
|
|
int ch, pfd, tfd;
|
|
char *arg;
|
|
|
|
#ifdef YP
|
|
use_yp = _yp_check(NULL);
|
|
#endif
|
|
|
|
op = EDITENTRY;
|
|
while ((ch = getopt(argc, argv, "a:s:ly")) != EOF)
|
|
switch(ch) {
|
|
case 'a':
|
|
op = LOADENTRY;
|
|
arg = optarg;
|
|
break;
|
|
case 's':
|
|
op = NEWSH;
|
|
arg = optarg;
|
|
break;
|
|
#ifdef YP
|
|
case 'l':
|
|
use_yp = 0;
|
|
break;
|
|
case 'y':
|
|
if (!use_yp) {
|
|
fprintf(stderr, "chpass: YP not in use.\n");
|
|
usage();
|
|
exit(1);
|
|
}
|
|
force_yp = 1;
|
|
break;
|
|
#endif
|
|
case '?':
|
|
default:
|
|
usage();
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
#ifdef YP
|
|
if (op == LOADENTRY && use_yp) {
|
|
(void)fprintf(stderr, "chpass: cannot load entry using NIS.\n\tUse the -l flag to load local.\n");
|
|
exit(1);
|
|
}
|
|
#endif
|
|
uid = getuid();
|
|
|
|
if (op == EDITENTRY || op == NEWSH)
|
|
switch(argc) {
|
|
case 0:
|
|
pw = getpwuid(uid);
|
|
#ifdef YP
|
|
if (pw && !force_yp)
|
|
use_yp = 0;
|
|
else if (use_yp)
|
|
pw = ypgetpwuid(uid);
|
|
#endif /* YP */
|
|
if (!pw) {
|
|
(void)fprintf(stderr,
|
|
"chpass: unknown user: uid %u\n", uid);
|
|
exit(1);
|
|
}
|
|
break;
|
|
case 1:
|
|
pw = getpwnam(*argv);
|
|
#ifdef YP
|
|
if (pw && !force_yp)
|
|
use_yp = 0;
|
|
else if (use_yp)
|
|
pw = ypgetpwnam(*argv);
|
|
#endif /* YP */
|
|
if (!pw) {
|
|
(void)fprintf(stderr,
|
|
"chpass: unknown user %s.\n", *argv);
|
|
exit(1);
|
|
}
|
|
if (uid && uid != pw->pw_uid)
|
|
baduser();
|
|
break;
|
|
default:
|
|
usage();
|
|
}
|
|
|
|
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) {
|
|
if (uid)
|
|
baduser();
|
|
pw = &lpw;
|
|
if (!pw_scan(arg, pw))
|
|
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();
|
|
pfd = pw_lock();
|
|
tfd = pw_tmp();
|
|
|
|
if (op == EDITENTRY) {
|
|
display(tfd, pw);
|
|
edit(pw);
|
|
(void)unlink(tempname);
|
|
tfd = pw_tmp();
|
|
}
|
|
|
|
#ifdef YP
|
|
if (use_yp) {
|
|
(void)unlink(tempname);
|
|
if (pw_yp(pw, uid))
|
|
pw_error((char *)NULL, 0, 1);
|
|
else
|
|
exit(0);
|
|
}
|
|
else
|
|
#endif /* YP */
|
|
pw_copy(pfd, tfd, pw);
|
|
|
|
if (!pw_mkdb())
|
|
pw_error((char *)NULL, 0, 1);
|
|
|
|
exit(0);
|
|
}
|
|
|
|
baduser()
|
|
{
|
|
(void)fprintf(stderr, "chpass: %s\n", strerror(EACCES));
|
|
exit(1);
|
|
}
|
|
|
|
usage()
|
|
{
|
|
#ifdef YP
|
|
(void)fprintf(stderr, "usage: chpass [-a list] [-s shell] [-l]%s [user]\n", use_yp?" [-y]":"");
|
|
#else
|
|
(void)fprintf(stderr, "usage: chpass [-a list] [-s shell] [user]\n");
|
|
#endif
|
|
exit(1);
|
|
}
|