244 lines
6.8 KiB
C
244 lines
6.8 KiB
C
/*-
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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. 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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char 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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static char sccsid[] = "@(#)chpass.c 5.17 (Berkeley) 3/3/91";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/signal.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <fcntl.h>
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#include <pwd.h>
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#include <errno.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include "chpass.h"
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#include "pathnames.h"
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char *progname = "chpass";
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char *tempname;
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uid_t uid;
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#ifdef YP
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int use_yp;
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int force_yp = 0;
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extern struct passwd *ypgetpwnam(), *ypgetpwuid();
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#endif
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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 int optind;
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extern char *optarg;
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register enum { NEWSH, LOADENTRY, EDITENTRY } op;
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register struct passwd *pw;
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struct passwd lpw;
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int ch, pfd, tfd;
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char *arg;
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#ifdef YP
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use_yp = _yp_check(NULL);
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#endif
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op = EDITENTRY;
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while ((ch = getopt(argc, argv, "a:s:ly")) != EOF)
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switch(ch) {
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case 'a':
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op = LOADENTRY;
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arg = optarg;
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break;
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case 's':
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op = NEWSH;
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arg = optarg;
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break;
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#ifdef YP
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case 'l':
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use_yp = 0;
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break;
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case 'y':
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if (!use_yp) {
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fprintf(stderr, "chpass: YP not in use.\n");
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usage();
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exit(1);
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}
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force_yp = 1;
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break;
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#endif
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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#ifdef YP
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if (op == LOADENTRY && use_yp) {
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(void)fprintf(stderr, "chpass: cannot load entry using NIS.\n\tUse the -l flag to load local.\n");
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exit(1);
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}
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#endif
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uid = getuid();
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if (op == EDITENTRY || op == NEWSH)
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switch(argc) {
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case 0:
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pw = getpwuid(uid);
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#ifdef YP
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if (pw && !force_yp)
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use_yp = 0;
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else if (use_yp)
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pw = ypgetpwuid(uid);
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#endif /* YP */
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if (!pw) {
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(void)fprintf(stderr,
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"chpass: unknown user: uid %u\n", uid);
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exit(1);
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}
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break;
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case 1:
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pw = getpwnam(*argv);
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#ifdef YP
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if (pw && !force_yp)
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use_yp = 0;
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else if (use_yp)
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pw = ypgetpwnam(*argv);
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#endif /* YP */
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if (!pw) {
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(void)fprintf(stderr,
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"chpass: unknown user %s.\n", *argv);
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exit(1);
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}
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if (uid && uid != pw->pw_uid)
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baduser();
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break;
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default:
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usage();
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}
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if (op == NEWSH) {
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/* protect p_shell -- it thinks NULL is /bin/sh */
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if (!arg[0])
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usage();
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if (p_shell(arg, pw, (ENTRY *)NULL))
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pw_error((char *)NULL, 0, 1);
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}
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if (op == LOADENTRY) {
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if (uid)
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baduser();
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pw = &lpw;
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if (!pw_scan(arg, pw))
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exit(1);
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}
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/*
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* The temporary file/file descriptor usage is a little tricky here.
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* 1: We start off with two fd's, one for the master password
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* file (used to lock everything), and one for a temporary file.
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* 2: Display() gets an fp for the temporary file, and copies the
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* user's information into it. It then gives the temporary file
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* to the user and closes the fp, closing the underlying fd.
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* 3: The user edits the temporary file some number of times.
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* 4: Verify() gets an fp for the temporary file, and verifies the
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* contents. It can't use an fp derived from the step #2 fd,
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* because the user's editor may have created a new instance of
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* the file. Once the file is verified, its contents are stored
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* in a password structure. The verify routine closes the fp,
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* closing the underlying fd.
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* 5: Delete the temporary file.
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* 6: Get a new temporary file/fd. Pw_copy() gets an fp for it
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* file and copies the master password file into it, replacing
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* the user record with a new one. We can't use the first
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* temporary file for this because it was owned by the user.
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* Pw_copy() closes its fp, flushing the data and closing the
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* underlying file descriptor. We can't close the master
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* password fp, or we'd lose the lock.
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* 7: Call pw_mkdb() (which renames the temporary file) and exit.
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* The exit closes the master passwd fp/fd.
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*/
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pw_init();
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pfd = pw_lock();
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tfd = pw_tmp();
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if (op == EDITENTRY) {
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display(tfd, pw);
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edit(pw);
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(void)unlink(tempname);
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tfd = pw_tmp();
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}
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#ifdef YP
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if (use_yp) {
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(void)unlink(tempname);
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if (pw_yp(pw, uid))
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pw_error((char *)NULL, 0, 1);
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else
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exit(0);
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}
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else
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#endif /* YP */
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pw_copy(pfd, tfd, pw);
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if (!pw_mkdb())
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pw_error((char *)NULL, 0, 1);
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exit(0);
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}
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baduser()
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{
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(void)fprintf(stderr, "chpass: %s\n", strerror(EACCES));
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exit(1);
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}
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usage()
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{
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#ifdef YP
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(void)fprintf(stderr, "usage: chpass [-a list] [-s shell] [-l]%s [user]\n", use_yp?" [-y]":"");
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#else
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(void)fprintf(stderr, "usage: chpass [-a list] [-s shell] [user]\n");
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#endif
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exit(1);
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}
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