1 /* 2 * Copyright (c) 1988, 1993, 1994 3 * The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California. All rights reserved. 30 * @(#)chown.c 8.8 (Berkeley) 4/4/94 31 * $FreeBSD: head/usr.sbin/chown/chown.c 282208 2015-04-29 00:49:00Z smh $ 32 */ 33 34 #include <sys/param.h> 35 #include <sys/stat.h> 36 37 #include <err.h> 38 #include <errno.h> 39 #include <fcntl.h> 40 #include <fts.h> 41 #include <grp.h> 42 #include <libgen.h> 43 #include <pwd.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 56 static uid_t uid; 57 static gid_t gid; 58 static int ischown; 59 static const char *gname; 60 61 int 62 main(int argc, char **argv) 63 { 64 FTS *ftsp; 65 FTSENT *p; 66 int Hflag, Lflag, Rflag, fflag, hflag, vflag, xflag; 67 int ch, fts_options, rval; 68 char *cp; 69 70 ischown = (strcmp(basename(argv[0]), "chown") == 0); 71 72 Hflag = Lflag = Rflag = fflag = hflag = vflag = xflag = 0; 73 while ((ch = getopt(argc, argv, "HLPRfhvx")) != -1) 74 switch (ch) { 75 case 'H': 76 Hflag = 1; 77 Lflag = 0; 78 break; 79 case 'L': 80 Lflag = 1; 81 Hflag = 0; 82 break; 83 case 'P': 84 Hflag = Lflag = 0; 85 break; 86 case 'R': 87 Rflag = 1; 88 break; 89 case 'f': 90 fflag = 1; 91 break; 92 case 'h': 93 hflag = 1; 94 break; 95 case 'v': 96 vflag++; 97 break; 98 case 'x': 99 xflag = 1; 100 break; 101 default: 102 usage(); 103 } 104 argv += optind; 105 argc -= optind; 106 107 if (argc < 2) 108 usage(); 109 110 if (Rflag) { 111 if (hflag && (Hflag || Lflag)) 112 errx(1, "the -R%c and -h options may not be " 113 "specified together", Hflag ? 'H' : 'L'); 114 if (Lflag) { 115 fts_options = FTS_LOGICAL; 116 } else { 117 fts_options = FTS_PHYSICAL; 118 119 if (Hflag) { 120 fts_options |= FTS_COMFOLLOW; 121 } 122 } 123 } else if (hflag) { 124 fts_options = FTS_PHYSICAL; 125 } else { 126 fts_options = FTS_LOGICAL; 127 } 128 129 if (xflag) 130 fts_options |= FTS_XDEV; 131 132 uid = (uid_t)-1; 133 gid = (gid_t)-1; 134 if (ischown) { 135 if ((cp = strchr(*argv, ':')) != NULL) { 136 *cp++ = '\0'; 137 a_gid(cp); 138 } 139 #ifdef SUPPORT_DOT 140 else if ((cp = strchr(*argv, '.')) != NULL) { 141 warnx("separation of user and group with a period is deprecated"); 142 *cp++ = '\0'; 143 a_gid(cp); 144 } 145 #endif 146 a_uid(*argv); 147 } else 148 a_gid(*argv); 149 150 if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL) 151 err(1, NULL); 152 153 for (rval = 0; (p = fts_read(ftsp)) != NULL;) { 154 int atflag; 155 156 if ((fts_options & FTS_LOGICAL) || 157 ((fts_options & FTS_COMFOLLOW) && 158 p->fts_level == FTS_ROOTLEVEL)) 159 atflag = 0; 160 else 161 atflag = AT_SYMLINK_NOFOLLOW; 162 163 switch (p->fts_info) { 164 case FTS_D: /* Change it at FTS_DP. */ 165 if (!Rflag) 166 fts_set(ftsp, p, FTS_SKIP); 167 continue; 168 case FTS_DNR: /* Warn, chown. */ 169 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 170 rval = 1; 171 break; 172 case FTS_ERR: /* Warn, continue. */ 173 case FTS_NS: 174 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 175 rval = 1; 176 continue; 177 default: 178 break; 179 } 180 if ((uid == (uid_t)(-1) || uid == p->fts_statp->st_uid) && 181 (gid == (gid_t)(-1) || gid == p->fts_statp->st_gid)) 182 continue; 183 if (fchownat(AT_FDCWD, p->fts_accpath, uid, gid, atflag) 184 == -1 && !fflag) { 185 chownerr(p->fts_path); 186 rval = 1; 187 } else if (vflag) { 188 printf("%s", p->fts_path); 189 if (vflag > 1) { 190 if (ischown) { 191 printf(": %ju:%ju -> %ju:%ju", 192 (uintmax_t) 193 p->fts_statp->st_uid, 194 (uintmax_t) 195 p->fts_statp->st_gid, 196 (uid == (uid_t)(-1)) ? 197 (uintmax_t) 198 p->fts_statp->st_uid : 199 (uintmax_t)uid, 200 (gid == (gid_t)(-1)) ? 201 (uintmax_t) 202 p->fts_statp->st_gid : 203 (uintmax_t)gid); 204 } else { 205 printf(": %ju -> %ju", 206 (uintmax_t) 207 p->fts_statp->st_gid, 208 (gid == (gid_t)(-1)) ? 209 (uintmax_t) 210 p->fts_statp->st_gid : 211 (uintmax_t)gid); 212 } 213 } 214 printf("\n"); 215 } 216 } 217 if (errno) 218 err(1, "fts_read"); 219 exit(rval); 220 } 221 222 static void 223 a_gid(const char *s) 224 { 225 struct group *gr; 226 227 if (*s == '\0') /* Argument was "uid[:.]". */ 228 return; 229 gname = s; 230 gid = ((gr = getgrnam(s)) != NULL) ? gr->gr_gid : id(s, "group"); 231 } 232 233 static void 234 a_uid(const char *s) 235 { 236 struct passwd *pw; 237 238 if (*s == '\0') /* Argument was "[:.]gid". */ 239 return; 240 uid = ((pw = getpwnam(s)) != NULL) ? pw->pw_uid : id(s, "user"); 241 } 242 243 static uid_t 244 id(const char *name, const char *type) 245 { 246 uid_t val; 247 char *ep; 248 249 /* 250 * XXX 251 * We know that uid_t's and gid_t's are unsigned longs. 252 */ 253 errno = 0; 254 val = strtoul(name, &ep, 10); 255 if (errno || *ep != '\0') 256 errx(1, "%s: illegal %s name", name, type); 257 return (val); 258 } 259 260 static void 261 chownerr(const char *file) 262 { 263 static uid_t euid = -1; 264 static int ngroups = -1; 265 static long ngroups_max; 266 gid_t *groups; 267 268 /* Check for chown without being root. */ 269 if (errno != EPERM || (uid != (uid_t)(-1) && 270 euid == (uid_t)(-1) && (euid = geteuid()) != 0)) { 271 warn("%s", file); 272 return; 273 } 274 275 /* Check group membership; kernel just returns EPERM. */ 276 if (gid != (gid_t)(-1) && ngroups == -1 && 277 euid == (uid_t)(-1) && (euid = geteuid()) != 0) { 278 ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1; 279 if ((groups = malloc(sizeof(gid_t) * ngroups_max)) == NULL) 280 err(1, "malloc"); 281 ngroups = getgroups(ngroups_max, groups); 282 while (--ngroups >= 0 && gid != groups[ngroups]); 283 free(groups); 284 if (ngroups < 0) { 285 warnx("you are not a member of group %s", gname); 286 return; 287 } 288 } 289 warn("%s", file); 290 } 291 292 static void 293 usage(void) 294 { 295 296 if (ischown) 297 fprintf(stderr, "%s\n%s\n", 298 "usage: chown [-fhvx] [-R [-H | -L | -P]] owner[:group]" 299 " file ...", 300 " chown [-fhvx] [-R [-H | -L | -P]] :group file ..."); 301 else 302 fprintf(stderr, "%s\n", 303 "usage: chgrp [-fhvx] [-R [-H | -L | -P]] group file ..."); 304 exit(1); 305 } 306