Annotation of src/usr.bin/chpass/chpass.c, Revision 1.16
1.16 ! millert 1: /* $OpenBSD: chpass.c,v 1.15 2000/11/21 13:36:14 aaron 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
1.16 ! millert 47: static char rcsid[] = "$OpenBSD: chpass.c,v 1.15 2000/11/21 13:36:14 aaron Exp $";
1.1 deraadt 48: #endif
49: #endif /* not lint */
50:
51: #include <sys/param.h>
52: #include <sys/stat.h>
53: #include <sys/time.h>
54: #include <sys/resource.h>
55:
56: #include <ctype.h>
57: #include <err.h>
58: #include <errno.h>
59: #include <fcntl.h>
60: #include <pwd.h>
61: #include <stdio.h>
62: #include <stdlib.h>
63: #include <string.h>
64: #include <unistd.h>
1.2 deraadt 65: #include <util.h>
1.1 deraadt 66:
67: #include "chpass.h"
68: #include "pathnames.h"
69:
1.14 millert 70: char tempname[] = __CONCAT(_PATH_VARTMP,"pw.XXXXXXXX");
1.1 deraadt 71: uid_t uid;
72:
1.13 millert 73: extern char *__progname;
74:
1.1 deraadt 75: #ifdef YP
76: int use_yp;
77: int force_yp = 0;
78: extern struct passwd *ypgetpwnam(), *ypgetpwuid();
1.10 deraadt 79: int _yp_check __P((char **));
80: int pw_yp __P((struct passwd *, uid_t));
1.1 deraadt 81: #endif
82:
83: void baduser __P((void));
1.14 millert 84: void tempcleanup __P((void));
1.1 deraadt 85: void usage __P((void));
86:
87: int
88: main(argc, argv)
89: int argc;
90: char **argv;
91: {
92: enum { NEWSH, LOADENTRY, EDITENTRY } op;
93: struct passwd *pw, lpw;
1.2 deraadt 94: int ch, pfd, tfd, dfd;
1.14 millert 95: char *arg;
1.1 deraadt 96:
97: #ifdef YP
98: use_yp = _yp_check(NULL);
99: #endif
100:
101: op = EDITENTRY;
1.7 millert 102: while ((ch = getopt(argc, argv, "a:s:ly")) != -1)
1.1 deraadt 103: switch(ch) {
104: case 'a':
105: op = LOADENTRY;
106: arg = optarg;
107: break;
108: case 's':
109: op = NEWSH;
110: arg = optarg;
111: break;
112: #ifdef YP
113: case 'l':
114: use_yp = 0;
115: break;
116: case 'y':
117: if (!use_yp) {
118: warnx("YP not in use.");
119: usage();
120: }
121: force_yp = 1;
122: break;
123: #endif
124: case '?':
125: default:
126: usage();
127: }
128: argc -= optind;
129: argv += optind;
130:
131: #ifdef YP
132: if (op == LOADENTRY && use_yp)
133: errx(1, "cannot load entry using NIS.\n\tUse the -l flag to load local.");
134: #endif
135: uid = getuid();
136:
137: if (op == EDITENTRY || op == NEWSH)
138: switch(argc) {
139: case 0:
140: pw = getpwuid(uid);
141: #ifdef YP
142: if (pw && !force_yp)
143: use_yp = 0;
144: else if (use_yp)
145: pw = ypgetpwuid(uid);
146: #endif /* YP */
147: if (!pw)
148: errx(1, "unknown user: uid %u\n", uid);
149: break;
150: case 1:
151: pw = getpwnam(*argv);
152: #ifdef YP
153: if (pw && !force_yp)
154: use_yp = 0;
155: else if (use_yp)
156: pw = ypgetpwnam(*argv);
157: #endif /* YP */
158: if (!pw)
159: errx(1, "unknown user: %s", *argv);
160: if (uid && uid != pw->pw_uid)
161: baduser();
162: break;
163: default:
164: usage();
165: }
166:
167: if (op == NEWSH) {
168: /* protect p_shell -- it thinks NULL is /bin/sh */
169: if (!arg[0])
170: usage();
1.9 kstailey 171: if (p_shell(arg, pw, NULL))
172: pw_error(NULL, 0, 1);
1.1 deraadt 173: }
174:
175: if (op == LOADENTRY) {
176: if (uid)
177: baduser();
178: pw = &lpw;
1.9 kstailey 179: if (!pw_scan(arg, pw, NULL))
1.1 deraadt 180: exit(1);
181: }
182:
1.2 deraadt 183: /* Get the passwd lock file and open the passwd file for reading. */
1.1 deraadt 184: pw_init();
1.2 deraadt 185: tfd = pw_lock(0);
1.12 millert 186: if (tfd == -1 || fcntl(tfd, F_SETFD, 1) == -1) {
1.6 millert 187: if (errno == EEXIST)
188: errx(1, "the passwd file is busy.");
189: else
190: err(1, "can't open passwd temp file");
191: }
1.2 deraadt 192: pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0);
1.12 millert 193: if (pfd == -1 || fcntl(pfd, F_SETFD, 1) == -1)
1.2 deraadt 194: pw_error(_PATH_MASTERPASSWD, 1, 1);
1.1 deraadt 195:
1.2 deraadt 196: /* Edit the user passwd information if requested. */
1.1 deraadt 197: if (op == EDITENTRY) {
1.2 deraadt 198: dfd = mkstemp(tempname);
1.12 millert 199: if (dfd == -1 || fcntl(dfd, F_SETFD, 1) == -1)
1.2 deraadt 200: pw_error(tempname, 1, 1);
1.14 millert 201: atexit(tempcleanup);
1.2 deraadt 202: display(tempname, dfd, pw);
203: edit(tempname, pw);
1.1 deraadt 204: }
1.2 deraadt 205:
1.1 deraadt 206: #ifdef YP
207: if (use_yp) {
1.4 deraadt 208: if (pw_yp(pw, uid)) {
1.9 kstailey 209: pw_error(NULL, 0, 1);
1.4 deraadt 210: exit(1);
1.5 deraadt 211: } else {
212: pw_abort();
1.1 deraadt 213: exit(0);
1.5 deraadt 214: }
1.4 deraadt 215: } else
1.1 deraadt 216: #endif /* YP */
1.8 deraadt 217: {
218: /* Copy the passwd file to the lock file, updating pw. */
219: pw_copy(pfd, tfd, pw);
1.2 deraadt 220:
1.8 deraadt 221: /* Now finish the passwd file update. */
1.16 ! millert 222: if (pw_mkdb(pw->pw_name) == -1)
1.9 kstailey 223: pw_error(NULL, 0, 1);
1.8 deraadt 224: }
1.1 deraadt 225:
226: exit(0);
227: }
228:
229: void
230: baduser()
231: {
232:
233: errx(1, "%s", strerror(EACCES));
1.14 millert 234: }
235:
236: void
237: tempcleanup()
238: {
239:
240: unlink(tempname);
1.1 deraadt 241: }
242:
243: void
244: usage()
245: {
246:
247: #ifdef YP
1.15 aaron 248: (void)fprintf(stderr,
249: "usage: %s [-l%s] [-a list] [-s newshell] [user]\n",
250: __progname, use_yp ? "y" : "");
1.1 deraadt 251: #else
1.15 aaron 252: (void)fprintf(stderr, "usage: %s [-a list] [-s newshell] [user]\n",
1.13 millert 253: __progname);
1.1 deraadt 254: #endif
255: exit(1);
256: }
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