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c61fa9d9 WJ |
1 | /*- |
2 | * Copyright (c) 1988 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #ifndef lint | |
35 | char copyright[] = | |
36 | "@(#) Copyright (c) 1988 The Regents of the University of California.\n\ | |
37 | All rights reserved.\n"; | |
38 | #endif /* not lint */ | |
39 | ||
40 | #ifndef lint | |
41 | static char sccsid[] = "@(#)chpass.c 5.17 (Berkeley) 3/3/91"; | |
42 | #endif /* not lint */ | |
43 | ||
44 | #include <sys/param.h> | |
45 | #include <sys/stat.h> | |
46 | #include <sys/signal.h> | |
47 | #include <sys/time.h> | |
48 | #include <sys/resource.h> | |
49 | #include <fcntl.h> | |
50 | #include <pwd.h> | |
51 | #include <errno.h> | |
52 | #include <stdio.h> | |
53 | #include <ctype.h> | |
54 | #include <string.h> | |
55 | #include "chpass.h" | |
56 | #include "pathnames.h" | |
57 | ||
58 | char *progname = "chpass"; | |
59 | char *tempname; | |
60 | uid_t uid; | |
61 | ||
62 | main(argc, argv) | |
63 | int argc; | |
64 | char **argv; | |
65 | { | |
66 | extern int optind; | |
67 | extern char *optarg; | |
68 | register enum { NEWSH, LOADENTRY, EDITENTRY } op; | |
69 | register struct passwd *pw; | |
70 | struct passwd lpw; | |
71 | int ch, pfd, tfd; | |
72 | char *arg; | |
73 | ||
74 | op = EDITENTRY; | |
75 | while ((ch = getopt(argc, argv, "a:s:")) != EOF) | |
76 | switch(ch) { | |
77 | case 'a': | |
78 | op = LOADENTRY; | |
79 | arg = optarg; | |
80 | break; | |
81 | case 's': | |
82 | op = NEWSH; | |
83 | arg = optarg; | |
84 | break; | |
85 | case '?': | |
86 | default: | |
87 | usage(); | |
88 | } | |
89 | argc -= optind; | |
90 | argv += optind; | |
91 | ||
92 | uid = getuid(); | |
93 | ||
94 | if (op == EDITENTRY || op == NEWSH) | |
95 | switch(argc) { | |
96 | case 0: | |
97 | if (!(pw = getpwuid(uid))) { | |
98 | (void)fprintf(stderr, | |
99 | "chpass: unknown user: uid %u\n", uid); | |
100 | exit(1); | |
101 | } | |
102 | break; | |
103 | case 1: | |
104 | if (!(pw = getpwnam(*argv))) { | |
105 | (void)fprintf(stderr, | |
106 | "chpass: unknown user %s.\n", *argv); | |
107 | exit(1); | |
108 | } | |
109 | if (uid && uid != pw->pw_uid) | |
110 | baduser(); | |
111 | break; | |
112 | default: | |
113 | usage(); | |
114 | } | |
115 | ||
116 | if (op == NEWSH) { | |
117 | /* protect p_shell -- it thinks NULL is /bin/sh */ | |
118 | if (!arg[0]) | |
119 | usage(); | |
120 | if (p_shell(arg, pw, (ENTRY *)NULL)) | |
121 | pw_error((char *)NULL, 0, 1); | |
122 | } | |
123 | ||
124 | if (op == LOADENTRY) { | |
125 | if (uid) | |
126 | baduser(); | |
127 | pw = &lpw; | |
128 | if (!pw_scan(arg, pw)) | |
129 | exit(1); | |
130 | } | |
131 | ||
132 | /* | |
133 | * The temporary file/file descriptor usage is a little tricky here. | |
134 | * 1: We start off with two fd's, one for the master password | |
135 | * file (used to lock everything), and one for a temporary file. | |
136 | * 2: Display() gets an fp for the temporary file, and copies the | |
137 | * user's information into it. It then gives the temporary file | |
138 | * to the user and closes the fp, closing the underlying fd. | |
139 | * 3: The user edits the temporary file some number of times. | |
140 | * 4: Verify() gets an fp for the temporary file, and verifies the | |
141 | * contents. It can't use an fp derived from the step #2 fd, | |
142 | * because the user's editor may have created a new instance of | |
143 | * the file. Once the file is verified, its contents are stored | |
144 | * in a password structure. The verify routine closes the fp, | |
145 | * closing the underlying fd. | |
146 | * 5: Delete the temporary file. | |
147 | * 6: Get a new temporary file/fd. Pw_copy() gets an fp for it | |
148 | * file and copies the master password file into it, replacing | |
149 | * the user record with a new one. We can't use the first | |
150 | * temporary file for this because it was owned by the user. | |
151 | * Pw_copy() closes its fp, flushing the data and closing the | |
152 | * underlying file descriptor. We can't close the master | |
153 | * password fp, or we'd lose the lock. | |
154 | * 7: Call pw_mkdb() (which renames the temporary file) and exit. | |
155 | * The exit closes the master passwd fp/fd. | |
156 | */ | |
157 | pw_init(); | |
158 | pfd = pw_lock(); | |
159 | tfd = pw_tmp(); | |
160 | ||
161 | if (op == EDITENTRY) { | |
162 | display(tfd, pw); | |
163 | edit(pw); | |
164 | (void)unlink(tempname); | |
165 | tfd = pw_tmp(); | |
166 | } | |
167 | ||
168 | pw_copy(pfd, tfd, pw); | |
169 | ||
170 | if (!pw_mkdb()) | |
171 | pw_error((char *)NULL, 0, 1); | |
172 | exit(0); | |
173 | } | |
174 | ||
175 | baduser() | |
176 | { | |
177 | (void)fprintf(stderr, "chpass: %s\n", strerror(EACCES)); | |
178 | exit(1); | |
179 | } | |
180 | ||
181 | usage() | |
182 | { | |
183 | (void)fprintf(stderr, "usage: chpass [-a list] [-s shell] [user]\n"); | |
184 | exit(1); | |
185 | } |