Annotation of src/usr.bin/chpass/chpass.c, Revision 1.1.1.1
1.1 deraadt 1: /* $NetBSD: chpass.c,v 1.7 1995/07/28 07:01:32 phil Exp $ */
2:
3: /*-
4: * Copyright (c) 1988, 1993, 1994
5: * The Regents of the University of California. All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #ifndef lint
37: static char copyright[] =
38: "@(#) Copyright (c) 1988, 1993, 1994\n\
39: The Regents of the University of California. All rights reserved.\n";
40: #endif /* not lint */
41:
42: #ifndef lint
43: #if 0
44: static char sccsid[] = "@(#)chpass.c 8.4 (Berkeley) 4/2/94";
45: #else
46: static char rcsid[] = "$NetBSD: chpass.c,v 1.7 1995/07/28 07:01:32 phil Exp $";
47: #endif
48: #endif /* not lint */
49:
50: #include <sys/param.h>
51: #include <sys/stat.h>
52: #include <sys/time.h>
53: #include <sys/resource.h>
54:
55: #include <ctype.h>
56: #include <err.h>
57: #include <errno.h>
58: #include <fcntl.h>
59: #include <pwd.h>
60: #include <stdio.h>
61: #include <stdlib.h>
62: #include <string.h>
63: #include <unistd.h>
64:
65: #include <pw_scan.h>
66: #include <pw_util.h>
67: #include "pw_copy.h"
68:
69: #include "chpass.h"
70: #include "pathnames.h"
71:
72: char *progname = "chpass";
73: char *tempname;
74: uid_t uid;
75:
76: #ifdef YP
77: int use_yp;
78: int force_yp = 0;
79: extern struct passwd *ypgetpwnam(), *ypgetpwuid();
80: #endif
81:
82: void baduser __P((void));
83: void usage __P((void));
84:
85: int
86: main(argc, argv)
87: int argc;
88: char **argv;
89: {
90: enum { NEWSH, LOADENTRY, EDITENTRY } op;
91: struct passwd *pw, lpw;
92: int ch, pfd, tfd;
93: char *arg;
94:
95: #ifdef YP
96: use_yp = _yp_check(NULL);
97: #endif
98:
99: op = EDITENTRY;
100: while ((ch = getopt(argc, argv, "a:s:ly")) != EOF)
101: switch(ch) {
102: case 'a':
103: op = LOADENTRY;
104: arg = optarg;
105: break;
106: case 's':
107: op = NEWSH;
108: arg = optarg;
109: break;
110: #ifdef YP
111: case 'l':
112: use_yp = 0;
113: break;
114: case 'y':
115: if (!use_yp) {
116: warnx("YP not in use.");
117: usage();
118: }
119: force_yp = 1;
120: break;
121: #endif
122: case '?':
123: default:
124: usage();
125: }
126: argc -= optind;
127: argv += optind;
128:
129: #ifdef YP
130: if (op == LOADENTRY && use_yp)
131: errx(1, "cannot load entry using NIS.\n\tUse the -l flag to load local.");
132: #endif
133: uid = getuid();
134:
135: if (op == EDITENTRY || op == NEWSH)
136: switch(argc) {
137: case 0:
138: pw = getpwuid(uid);
139: #ifdef YP
140: if (pw && !force_yp)
141: use_yp = 0;
142: else if (use_yp)
143: pw = ypgetpwuid(uid);
144: #endif /* YP */
145: if (!pw)
146: errx(1, "unknown user: uid %u\n", uid);
147: break;
148: case 1:
149: pw = getpwnam(*argv);
150: #ifdef YP
151: if (pw && !force_yp)
152: use_yp = 0;
153: else if (use_yp)
154: pw = ypgetpwnam(*argv);
155: #endif /* YP */
156: if (!pw)
157: errx(1, "unknown user: %s", *argv);
158: if (uid && uid != pw->pw_uid)
159: baduser();
160: break;
161: default:
162: usage();
163: }
164:
165: if (op == NEWSH) {
166: /* protect p_shell -- it thinks NULL is /bin/sh */
167: if (!arg[0])
168: usage();
169: if (p_shell(arg, pw, (ENTRY *)NULL))
170: pw_error((char *)NULL, 0, 1);
171: }
172:
173: if (op == LOADENTRY) {
174: if (uid)
175: baduser();
176: pw = &lpw;
177: if (!pw_scan(arg, pw, (int *)NULL))
178: exit(1);
179: }
180:
181: /*
182: * The temporary file/file descriptor usage is a little tricky here.
183: * 1: We start off with two fd's, one for the master password
184: * file (used to lock everything), and one for a temporary file.
185: * 2: Display() gets an fp for the temporary file, and copies the
186: * user's information into it. It then gives the temporary file
187: * to the user and closes the fp, closing the underlying fd.
188: * 3: The user edits the temporary file some number of times.
189: * 4: Verify() gets an fp for the temporary file, and verifies the
190: * contents. It can't use an fp derived from the step #2 fd,
191: * because the user's editor may have created a new instance of
192: * the file. Once the file is verified, its contents are stored
193: * in a password structure. The verify routine closes the fp,
194: * closing the underlying fd.
195: * 5: Delete the temporary file.
196: * 6: Get a new temporary file/fd. Pw_copy() gets an fp for it
197: * file and copies the master password file into it, replacing
198: * the user record with a new one. We can't use the first
199: * temporary file for this because it was owned by the user.
200: * Pw_copy() closes its fp, flushing the data and closing the
201: * underlying file descriptor. We can't close the master
202: * password fp, or we'd lose the lock.
203: * 7: Call pw_mkdb() (which renames the temporary file) and exit.
204: * The exit closes the master passwd fp/fd.
205: */
206: pw_init();
207: pfd = pw_lock();
208: tfd = pw_tmp();
209:
210: if (op == EDITENTRY) {
211: display(tfd, pw);
212: edit(pw);
213: (void)unlink(tempname);
214: tfd = pw_tmp();
215: }
216:
217: #ifdef YP
218: if (use_yp) {
219: (void)unlink(tempname);
220: if (pw_yp(pw, uid))
221: pw_error((char *)NULL, 0, 1);
222: else
223: exit(0);
224: }
225: else
226: #endif /* YP */
227: pw_copy(pfd, tfd, pw);
228:
229: if (!pw_mkdb())
230: pw_error((char *)NULL, 0, 1);
231:
232: exit(0);
233: }
234:
235: void
236: baduser()
237: {
238:
239: errx(1, "%s", strerror(EACCES));
240: }
241:
242: void
243: usage()
244: {
245:
246: #ifdef YP
247: (void)fprintf(stderr, "usage: chpass [-a list] [-s shell] [-l]%s [user]\n", use_yp?" [-y]":"");
248: #else
249: (void)fprintf(stderr, "usage: chpass [-a list] [-s shell] [user]\n");
250: #endif
251: exit(1);
252: }
![[BACK]](/icons/back.gif){kind=icon}
Return to chpass.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / chpass