1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
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. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/param.h>
33 #include <sys/stat.h>
34
35 #include <err.h>
36 #include <errno.h>
37 #include <fcntl.h>
38 #include <fts.h>
39 #include <grp.h>
40 #include <libgen.h>
41 #include <pwd.h>
42 #include <signal.h>
43 #include <stddef.h>
44 #include <stdint.h>
45 #include <stdio.h>
46 #include <stdlib.h>
47 #include <string.h>
48 #include <unistd.h>
49
50 static void a_gid(const char *);
51 static void a_uid(const char *);
52 static void chownerr(const char *);
53 static uid_t id(const char *, const char *);
54 static void usage(void);
55 static void print_info(const FTSENT *, int);
56
57 static uid_t uid;
58 static gid_t gid;
59 static int ischown;
60 static const char *gname;
61 static volatile sig_atomic_t siginfo;
62
63 static void
siginfo_handler(int sig __unused)64 siginfo_handler(int sig __unused)
65 {
66
67 siginfo = 1;
68 }
69
70 int
main(int argc,char ** argv)71 main(int argc, char **argv)
72 {
73 FTS *ftsp;
74 FTSENT *p;
75 int Hflag, Lflag, Rflag, fflag, hflag, vflag, xflag;
76 int ch, fts_options, rval;
77 char *cp;
78
79 ischown = (strcmp(basename(argv[0]), "chown") == 0);
80
81 Hflag = Lflag = Rflag = fflag = hflag = vflag = xflag = 0;
82 while ((ch = getopt(argc, argv, "HLPRfhvx")) != -1)
83 switch (ch) {
84 case 'H':
85 Hflag = 1;
86 Lflag = 0;
87 break;
88 case 'L':
89 Lflag = 1;
90 Hflag = 0;
91 break;
92 case 'P':
93 Hflag = Lflag = 0;
94 break;
95 case 'R':
96 Rflag = 1;
97 break;
98 case 'f':
99 fflag = 1;
100 break;
101 case 'h':
102 hflag = 1;
103 break;
104 case 'v':
105 vflag++;
106 break;
107 case 'x':
108 xflag = 1;
109 break;
110 case '?':
111 default:
112 usage();
113 }
114 argv += optind;
115 argc -= optind;
116
117 if (argc < 2)
118 usage();
119
120 (void)signal(SIGINFO, siginfo_handler);
121
122 if (Rflag) {
123 if (hflag && (Hflag || Lflag))
124 errx(1, "the -R%c and -h options may not be "
125 "specified together", Hflag ? 'H' : 'L');
126 if (Lflag) {
127 fts_options = FTS_LOGICAL;
128 } else {
129 fts_options = FTS_PHYSICAL;
130
131 if (Hflag) {
132 fts_options |= FTS_COMFOLLOW;
133 }
134 }
135 } else if (hflag) {
136 fts_options = FTS_PHYSICAL;
137 } else {
138 fts_options = FTS_LOGICAL;
139 }
140
141 if (xflag)
142 fts_options |= FTS_XDEV;
143
144 uid = (uid_t)-1;
145 gid = (gid_t)-1;
146 if (ischown) {
147 if ((cp = strchr(*argv, ':')) != NULL) {
148 *cp++ = '\0';
149 a_gid(cp);
150 }
151 #ifdef SUPPORT_DOT
152 else if ((cp = strchr(*argv, '.')) != NULL) {
153 warnx("separation of user and group with a period is deprecated");
154 *cp++ = '\0';
155 a_gid(cp);
156 }
157 #endif
158 a_uid(*argv);
159 } else
160 a_gid(*argv);
161
162 if ((ftsp = fts_open(++argv, fts_options, NULL)) == NULL)
163 err(1, NULL);
164
165 for (rval = 0; errno = 0, (p = fts_read(ftsp)) != NULL;) {
166 int atflag;
167
168 if ((fts_options & FTS_LOGICAL) ||
169 ((fts_options & FTS_COMFOLLOW) &&
170 p->fts_level == FTS_ROOTLEVEL))
171 atflag = 0;
172 else
173 atflag = AT_SYMLINK_NOFOLLOW;
174
175 switch (p->fts_info) {
176 case FTS_D: /* Change it at FTS_DP. */
177 if (!Rflag)
178 fts_set(ftsp, p, FTS_SKIP);
179 continue;
180 case FTS_DNR: /* Warn, chown. */
181 warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
182 rval = 1;
183 break;
184 case FTS_ERR: /* Warn, continue. */
185 case FTS_NS:
186 warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
187 rval = 1;
188 continue;
189 default:
190 break;
191 }
192 if (siginfo) {
193 print_info(p, 2);
194 siginfo = 0;
195 }
196 if ((uid == (uid_t)-1 || uid == p->fts_statp->st_uid) &&
197 (gid == (gid_t)-1 || gid == p->fts_statp->st_gid))
198 continue;
199 if (fchownat(AT_FDCWD, p->fts_accpath, uid, gid, atflag)
200 == -1 && !fflag) {
201 chownerr(p->fts_path);
202 rval = 1;
203 } else if (vflag)
204 print_info(p, vflag);
205 }
206 if (errno)
207 err(1, "fts_read");
208 exit(rval);
209 }
210
211 static void
a_gid(const char * s)212 a_gid(const char *s)
213 {
214 struct group *gr;
215
216 if (*s == '\0') /* Argument was "uid[:.]". */
217 return;
218 gname = s;
219 gid = ((gr = getgrnam(s)) != NULL) ? gr->gr_gid : id(s, "group");
220 }
221
222 static void
a_uid(const char * s)223 a_uid(const char *s)
224 {
225 struct passwd *pw;
226
227 if (*s == '\0') /* Argument was "[:.]gid". */
228 return;
229 uid = ((pw = getpwnam(s)) != NULL) ? pw->pw_uid : id(s, "user");
230 }
231
232 static uid_t
id(const char * name,const char * type)233 id(const char *name, const char *type)
234 {
235 unsigned long val;
236 char *ep;
237
238 errno = 0;
239 val = strtoul(name, &ep, 10);
240 _Static_assert(UID_MAX >= GID_MAX, "UID MAX less than GID MAX");
241 if (errno || *ep != '\0' || val > UID_MAX)
242 errx(1, "%s: illegal %s name", name, type);
243 return (val);
244 }
245
246 static void
chownerr(const char * file)247 chownerr(const char *file)
248 {
249 static uid_t euid = -1;
250 static int ngroups = -1;
251 static long ngroups_max;
252 gid_t *groups;
253
254 /* Check for chown without being root. */
255 if (errno != EPERM || (uid != (uid_t)-1 &&
256 euid == (uid_t)-1 && (euid = geteuid()) != 0)) {
257 warn("%s", file);
258 return;
259 }
260
261 /* Check group membership; kernel just returns EPERM. */
262 if (gid != (gid_t)-1 && ngroups == -1 &&
263 euid == (uid_t)-1 && (euid = geteuid()) != 0) {
264 ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1;
265 if ((groups = malloc(sizeof(gid_t) * ngroups_max)) == NULL)
266 err(1, "malloc");
267 ngroups = getgroups(ngroups_max, groups);
268 while (--ngroups >= 0 && gid != groups[ngroups]);
269 free(groups);
270 if (ngroups < 0) {
271 warnx("you are not a member of group %s", gname);
272 return;
273 }
274 }
275 warn("%s", file);
276 }
277
278 static void
usage(void)279 usage(void)
280 {
281
282 if (ischown)
283 (void)fprintf(stderr, "%s\n%s\n",
284 "usage: chown [-fhvx] [-R [-H | -L | -P]] owner[:group]"
285 " file ...",
286 " chown [-fhvx] [-R [-H | -L | -P]] :group file ...");
287 else
288 (void)fprintf(stderr, "%s\n",
289 "usage: chgrp [-fhvx] [-R [-H | -L | -P]] group file ...");
290 exit(1);
291 }
292
293 static void
print_info(const FTSENT * p,int vflag)294 print_info(const FTSENT *p, int vflag)
295 {
296
297 printf("%s", p->fts_path);
298 if (vflag > 1) {
299 if (ischown) {
300 printf(": %ju:%ju -> %ju:%ju",
301 (uintmax_t)p->fts_statp->st_uid,
302 (uintmax_t)p->fts_statp->st_gid,
303 (uid == (uid_t)-1) ?
304 (uintmax_t)p->fts_statp->st_uid : (uintmax_t)uid,
305 (gid == (gid_t)-1) ?
306 (uintmax_t)p->fts_statp->st_gid : (uintmax_t)gid);
307 } else {
308 printf(": %ju -> %ju", (uintmax_t)p->fts_statp->st_gid,
309 (gid == (gid_t)-1) ?
310 (uintmax_t)p->fts_statp->st_gid : (uintmax_t)gid);
311 }
312 }
313 printf("\n");
314 }
315