Annotation of src/usr.bin/chpass/chpass.c, Revision 1.20
1.20 ! millert 1: /* $OpenBSD: chpass.c,v 1.19 2001/08/16 18:29:27 millert Exp $ */
1.2 deraadt 2: /* $NetBSD: chpass.c,v 1.8 1996/05/15 21:50:43 jtc Exp $ */
1.1 deraadt 3:
4: /*-
5: * Copyright (c) 1988, 1993, 1994
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
38: static char copyright[] =
39: "@(#) Copyright (c) 1988, 1993, 1994\n\
40: The Regents of the University of California. All rights reserved.\n";
41: #endif /* not lint */
42:
43: #ifndef lint
44: #if 0
45: static char sccsid[] = "@(#)chpass.c 8.4 (Berkeley) 4/2/94";
46: #else
1.20 ! millert 47: static char rcsid[] = "$OpenBSD: chpass.c,v 1.19 2001/08/16 18:29:27 millert Exp $";
1.1 deraadt 48: #endif
49: #endif /* not lint */
50:
51: #include <sys/param.h>
1.17 millert 52: #include <sys/resource.h>
1.1 deraadt 53: #include <sys/stat.h>
54: #include <sys/time.h>
1.17 millert 55: #include <sys/uio.h>
1.1 deraadt 56:
57: #include <err.h>
58: #include <errno.h>
59: #include <fcntl.h>
60: #include <pwd.h>
1.17 millert 61: #include <signal.h>
1.1 deraadt 62: #include <stdio.h>
63: #include <stdlib.h>
64: #include <string.h>
65: #include <unistd.h>
1.2 deraadt 66: #include <util.h>
1.1 deraadt 67:
68: #include "chpass.h"
69: #include "pathnames.h"
70:
1.14 millert 71: char tempname[] = __CONCAT(_PATH_VARTMP,"pw.XXXXXXXX");
1.17 millert 72: enum { NEWSH, LOADENTRY, EDITENTRY } op;
1.1 deraadt 73: uid_t uid;
74:
1.13 millert 75: extern char *__progname;
76:
1.1 deraadt 77: #ifdef YP
78: int use_yp;
79: int force_yp = 0;
80: extern struct passwd *ypgetpwnam(), *ypgetpwuid();
1.10 deraadt 81: int _yp_check __P((char **));
82: int pw_yp __P((struct passwd *, uid_t));
1.1 deraadt 83: #endif
84:
85: void baduser __P((void));
1.14 millert 86: void tempcleanup __P((void));
1.17 millert 87: void kbintr __P((int));
1.1 deraadt 88: void usage __P((void));
89:
90: int
91: main(argc, argv)
92: int argc;
93: char **argv;
94: {
95: struct passwd *pw, lpw;
1.20 ! millert 96: int i, ch, pfd, tfd, dfd;
1.14 millert 97: char *arg;
1.17 millert 98: sigset_t fullset;
1.1 deraadt 99:
100: #ifdef YP
101: use_yp = _yp_check(NULL);
102: #endif
103:
104: op = EDITENTRY;
1.7 millert 105: while ((ch = getopt(argc, argv, "a:s:ly")) != -1)
1.1 deraadt 106: switch(ch) {
107: case 'a':
108: op = LOADENTRY;
109: arg = optarg;
110: break;
111: case 's':
112: op = NEWSH;
113: arg = optarg;
114: break;
115: #ifdef YP
116: case 'l':
117: use_yp = 0;
118: break;
119: case 'y':
120: if (!use_yp) {
121: warnx("YP not in use.");
122: usage();
123: }
124: force_yp = 1;
125: break;
126: #endif
127: case '?':
128: default:
129: usage();
130: }
131: argc -= optind;
132: argv += optind;
133:
134: #ifdef YP
135: if (op == LOADENTRY && use_yp)
136: errx(1, "cannot load entry using NIS.\n\tUse the -l flag to load local.");
137: #endif
138: uid = getuid();
139:
140: if (op == EDITENTRY || op == NEWSH)
141: switch(argc) {
142: case 0:
143: pw = getpwuid(uid);
144: #ifdef YP
145: if (pw && !force_yp)
146: use_yp = 0;
147: else if (use_yp)
148: pw = ypgetpwuid(uid);
149: #endif /* YP */
150: if (!pw)
151: errx(1, "unknown user: uid %u\n", uid);
152: break;
153: case 1:
154: pw = getpwnam(*argv);
155: #ifdef YP
156: if (pw && !force_yp)
157: use_yp = 0;
158: else if (use_yp)
159: pw = ypgetpwnam(*argv);
160: #endif /* YP */
161: if (!pw)
162: errx(1, "unknown user: %s", *argv);
163: if (uid && uid != pw->pw_uid)
164: baduser();
165: break;
166: default:
167: usage();
168: }
169:
170: if (op == NEWSH) {
171: /* protect p_shell -- it thinks NULL is /bin/sh */
172: if (!arg[0])
173: usage();
1.9 kstailey 174: if (p_shell(arg, pw, NULL))
175: pw_error(NULL, 0, 1);
1.1 deraadt 176: }
177:
178: if (op == LOADENTRY) {
179: if (uid)
180: baduser();
181: pw = &lpw;
1.9 kstailey 182: if (!pw_scan(arg, pw, NULL))
1.1 deraadt 183: exit(1);
184: }
185:
1.2 deraadt 186: /* Edit the user passwd information if requested. */
1.1 deraadt 187: if (op == EDITENTRY) {
1.2 deraadt 188: dfd = mkstemp(tempname);
1.12 millert 189: if (dfd == -1 || fcntl(dfd, F_SETFD, 1) == -1)
1.2 deraadt 190: pw_error(tempname, 1, 1);
1.14 millert 191: atexit(tempcleanup);
1.2 deraadt 192: display(tempname, dfd, pw);
193: edit(tempname, pw);
1.1 deraadt 194: }
1.2 deraadt 195:
1.17 millert 196: /* Drop user's real uid and block all signals to avoid a DoS. */
197: setuid(0);
198: sigfillset(&fullset);
199: sigdelset(&fullset, SIGINT);
200: sigprocmask(SIG_BLOCK, &fullset, NULL);
201:
202: /* Get the passwd lock file and open the passwd file for reading. */
203: pw_init();
1.20 ! millert 204: for (i = 1; (tfd = pw_lock(0)) == -1; i++) {
! 205: if (i == 4)
! 206: (void)fputs("Attempting lock password file, "
! 207: "please wait or press ^C to abort", stderr);
! 208: (void)signal(SIGINT, kbintr);
! 209: if (i % 16 == 0)
1.17 millert 210: fputc('.', stderr);
1.20 ! millert 211: usleep(250000);
1.17 millert 212: (void)signal(SIGINT, SIG_IGN);
213: }
1.20 ! millert 214: if (i >= 4)
! 215: fputc('\n', stderr);
1.17 millert 216: pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0);
217: if (pfd == -1 || fcntl(pfd, F_SETFD, 1) == -1)
218: pw_error(_PATH_MASTERPASSWD, 1, 1);
219:
1.1 deraadt 220: #ifdef YP
221: if (use_yp) {
1.17 millert 222: if (pw_yp(pw, uid))
1.9 kstailey 223: pw_error(NULL, 0, 1);
1.17 millert 224: else {
1.5 deraadt 225: pw_abort();
1.1 deraadt 226: exit(0);
1.5 deraadt 227: }
1.4 deraadt 228: } else
1.1 deraadt 229: #endif /* YP */
1.8 deraadt 230: {
231: /* Copy the passwd file to the lock file, updating pw. */
232: pw_copy(pfd, tfd, pw);
1.2 deraadt 233:
1.8 deraadt 234: /* Now finish the passwd file update. */
1.19 millert 235: if (pw_mkdb(pw->pw_name, 0) == -1)
1.9 kstailey 236: pw_error(NULL, 0, 1);
1.8 deraadt 237: }
1.1 deraadt 238:
239: exit(0);
240: }
241:
242: void
243: baduser()
244: {
245:
246: errx(1, "%s", strerror(EACCES));
1.14 millert 247: }
248:
249: void
250: tempcleanup()
251: {
252:
253: unlink(tempname);
1.17 millert 254: }
255:
256: void
257: kbintr(signo)
258: int signo;
259: {
260: struct iovec iv[5];
261:
262: iv[0].iov_base = "\n";
263: iv[0].iov_len = 1;
264: iv[1].iov_base = __progname;
265: iv[1].iov_len = strlen(__progname);
266: iv[2].iov_base = ": ";
267: iv[2].iov_len = 2;
268: iv[3].iov_base = _PATH_MASTERPASSWD;
269: iv[3].iov_len = sizeof(_PATH_MASTERPASSWD) - 1;
270: iv[4].iov_base = " unchanged\n";
271: iv[4].iov_len = 11;
272: writev(STDERR_FILENO, iv, 5);
273:
274: if (op == EDITENTRY)
275: unlink(tempname);
276:
277: _exit(1);
1.1 deraadt 278: }
279:
280: void
281: usage()
282: {
283:
284: #ifdef YP
1.15 aaron 285: (void)fprintf(stderr,
286: "usage: %s [-l%s] [-a list] [-s newshell] [user]\n",
287: __progname, use_yp ? "y" : "");
1.1 deraadt 288: #else
1.15 aaron 289: (void)fprintf(stderr, "usage: %s [-a list] [-s newshell] [user]\n",
1.13 millert 290: __progname);
1.1 deraadt 291: #endif
292: exit(1);
293: }
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