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 #if 0 33 #ifndef lint 34 static const char copyright[] = 35 "@(#) Copyright (c) 1988, 1993, 1994\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 39 #ifndef lint 40 static char sccsid[] = "@(#)chown.c 8.8 (Berkeley) 4/4/94"; 41 #endif /* not lint */ 42 #endif 43 44 #include <sys/cdefs.h> 45 #include <sys/param.h> 46 #include <sys/stat.h> 47 48 #include <err.h> 49 #include <errno.h> 50 #include <fcntl.h> 51 #include <fts.h> 52 #include <grp.h> 53 #include <libgen.h> 54 #include <pwd.h> 55 #include <signal.h> 56 #include <stddef.h> 57 #include <stdint.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <unistd.h> 62 63 static void a_gid(const char *); 64 static void a_uid(const char *); 65 static void chownerr(const char *); 66 static uid_t id(const char *, const char *); 67 static void usage(void); 68 static void print_info(const FTSENT *, int); 69 70 static uid_t uid; 71 static gid_t gid; 72 static int ischown; 73 static const char *gname; 74 static volatile sig_atomic_t siginfo; 75 76 static void 77 siginfo_handler(int sig __unused) 78 { 79 80 siginfo = 1; 81 } 82 83 int 84 main(int argc, char **argv) 85 { 86 FTS *ftsp; 87 FTSENT *p; 88 int Hflag, Lflag, Rflag, fflag, hflag, vflag, xflag; 89 int ch, fts_options, rval; 90 char *cp; 91 92 ischown = (strcmp(basename(argv[0]), "chown") == 0); 93 94 Hflag = Lflag = Rflag = fflag = hflag = vflag = xflag = 0; 95 while ((ch = getopt(argc, argv, "HLPRfhvx")) != -1) 96 switch (ch) { 97 case 'H': 98 Hflag = 1; 99 Lflag = 0; 100 break; 101 case 'L': 102 Lflag = 1; 103 Hflag = 0; 104 break; 105 case 'P': 106 Hflag = Lflag = 0; 107 break; 108 case 'R': 109 Rflag = 1; 110 break; 111 case 'f': 112 fflag = 1; 113 break; 114 case 'h': 115 hflag = 1; 116 break; 117 case 'v': 118 vflag++; 119 break; 120 case 'x': 121 xflag = 1; 122 break; 123 case '?': 124 default: 125 usage(); 126 } 127 argv += optind; 128 argc -= optind; 129 130 if (argc < 2) 131 usage(); 132 133 (void)signal(SIGINFO, siginfo_handler); 134 135 if (Rflag) { 136 if (hflag && (Hflag || Lflag)) 137 errx(1, "the -R%c and -h options may not be " 138 "specified together", Hflag ? 'H' : 'L'); 139 if (Lflag) { 140 fts_options = FTS_LOGICAL; 141 } else { 142 fts_options = FTS_PHYSICAL; 143 144 if (Hflag) { 145 fts_options |= FTS_COMFOLLOW; 146 } 147 } 148 } else if (hflag) { 149 fts_options = FTS_PHYSICAL; 150 } else { 151 fts_options = FTS_LOGICAL; 152 } 153 154 if (xflag) 155 fts_options |= FTS_XDEV; 156 157 uid = (uid_t)-1; 158 gid = (gid_t)-1; 159 if (ischown) { 160 if ((cp = strchr(*argv, ':')) != NULL) { 161 *cp++ = '\0'; 162 a_gid(cp); 163 } 164 #ifdef SUPPORT_DOT 165 else if ((cp = strchr(*argv, '.')) != NULL) { 166 warnx("separation of user and group with a period is deprecated"); 167 *cp++ = '\0'; 168 a_gid(cp); 169 } 170 #endif 171 a_uid(*argv); 172 } else 173 a_gid(*argv); 174 175 if ((ftsp = fts_open(++argv, fts_options, NULL)) == NULL) 176 err(1, NULL); 177 178 for (rval = 0; errno = 0, (p = fts_read(ftsp)) != NULL;) { 179 int atflag; 180 181 if ((fts_options & FTS_LOGICAL) || 182 ((fts_options & FTS_COMFOLLOW) && 183 p->fts_level == FTS_ROOTLEVEL)) 184 atflag = 0; 185 else 186 atflag = AT_SYMLINK_NOFOLLOW; 187 188 switch (p->fts_info) { 189 case FTS_D: /* Change it at FTS_DP. */ 190 if (!Rflag) 191 fts_set(ftsp, p, FTS_SKIP); 192 continue; 193 case FTS_DNR: /* Warn, chown. */ 194 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 195 rval = 1; 196 break; 197 case FTS_ERR: /* Warn, continue. */ 198 case FTS_NS: 199 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 200 rval = 1; 201 continue; 202 default: 203 break; 204 } 205 if (siginfo) { 206 print_info(p, 2); 207 siginfo = 0; 208 } 209 if ((uid == (uid_t)-1 || uid == p->fts_statp->st_uid) && 210 (gid == (gid_t)-1 || gid == p->fts_statp->st_gid)) 211 continue; 212 if (fchownat(AT_FDCWD, p->fts_accpath, uid, gid, atflag) 213 == -1 && !fflag) { 214 chownerr(p->fts_path); 215 rval = 1; 216 } else if (vflag) 217 print_info(p, vflag); 218 } 219 if (errno) 220 err(1, "fts_read"); 221 exit(rval); 222 } 223 224 static void 225 a_gid(const char *s) 226 { 227 struct group *gr; 228 229 if (*s == '\0') /* Argument was "uid[:.]". */ 230 return; 231 gname = s; 232 gid = ((gr = getgrnam(s)) != NULL) ? gr->gr_gid : id(s, "group"); 233 } 234 235 static void 236 a_uid(const char *s) 237 { 238 struct passwd *pw; 239 240 if (*s == '\0') /* Argument was "[:.]gid". */ 241 return; 242 uid = ((pw = getpwnam(s)) != NULL) ? pw->pw_uid : id(s, "user"); 243 } 244 245 static uid_t 246 id(const char *name, const char *type) 247 { 248 unsigned long val; 249 char *ep; 250 251 errno = 0; 252 val = strtoul(name, &ep, 10); 253 _Static_assert(UID_MAX >= GID_MAX, "UID MAX less than GID MAX"); 254 if (errno || *ep != '\0' || val > UID_MAX) 255 errx(1, "%s: illegal %s name", name, type); 256 return (val); 257 } 258 259 static void 260 chownerr(const char *file) 261 { 262 static uid_t euid = -1; 263 static int ngroups = -1; 264 static long ngroups_max; 265 gid_t *groups; 266 267 /* Check for chown without being root. */ 268 if (errno != EPERM || (uid != (uid_t)-1 && 269 euid == (uid_t)-1 && (euid = geteuid()) != 0)) { 270 warn("%s", file); 271 return; 272 } 273 274 /* Check group membership; kernel just returns EPERM. */ 275 if (gid != (gid_t)-1 && ngroups == -1 && 276 euid == (uid_t)-1 && (euid = geteuid()) != 0) { 277 ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1; 278 if ((groups = malloc(sizeof(gid_t) * ngroups_max)) == NULL) 279 err(1, "malloc"); 280 ngroups = getgroups(ngroups_max, groups); 281 while (--ngroups >= 0 && gid != groups[ngroups]); 282 free(groups); 283 if (ngroups < 0) { 284 warnx("you are not a member of group %s", gname); 285 return; 286 } 287 } 288 warn("%s", file); 289 } 290 291 static void 292 usage(void) 293 { 294 295 if (ischown) 296 (void)fprintf(stderr, "%s\n%s\n", 297 "usage: chown [-fhvx] [-R [-H | -L | -P]] owner[:group]" 298 " file ...", 299 " chown [-fhvx] [-R [-H | -L | -P]] :group file ..."); 300 else 301 (void)fprintf(stderr, "%s\n", 302 "usage: chgrp [-fhvx] [-R [-H | -L | -P]] group file ..."); 303 exit(1); 304 } 305 306 static void 307 print_info(const FTSENT *p, int vflag) 308 { 309 310 printf("%s", p->fts_path); 311 if (vflag > 1) { 312 if (ischown) { 313 printf(": %ju:%ju -> %ju:%ju", 314 (uintmax_t)p->fts_statp->st_uid, 315 (uintmax_t)p->fts_statp->st_gid, 316 (uid == (uid_t)-1) ? 317 (uintmax_t)p->fts_statp->st_uid : (uintmax_t)uid, 318 (gid == (gid_t)-1) ? 319 (uintmax_t)p->fts_statp->st_gid : (uintmax_t)gid); 320 } else { 321 printf(": %ju -> %ju", (uintmax_t)p->fts_statp->st_gid, 322 (gid == (gid_t)-1) ? 323 (uintmax_t)p->fts_statp->st_gid : (uintmax_t)gid); 324 } 325 } 326 printf("\n"); 327 } 328