chown/chown.c

   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. 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 #include <sys/cdefs.h>
  35 #ifndef lint
  36 __used static const char copyright[] =
  37 "@(#) Copyright (c) 1988, 1993, 1994\n\
  38         The Regents of the University of California.  All rights reserved.\n";
  39 #endif /* not lint */
  40
  41 #ifndef lint
  42 #if 0
  43 static char sccsid[] = "@(#)chown.c     8.8 (Berkeley) 4/4/94";
  44 #endif
  45 #endif /* not lint */
  46
  47 #include <sys/cdefs.h>
  48 __RCSID("$FreeBSD: src/usr.sbin/chown/chown.c,v 1.24 2002/07/17 16:22:24 dwmalone Exp $");
  49
  50 #include <sys/param.h>
  51 #include <sys/stat.h>
  52
  53 #include <err.h>
  54 #include <errno.h>
  55 #include <fts.h>
  56 #include <grp.h>
  57 #include <pwd.h>
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61 #include <unistd.h>
  62 #include <sys/time.h>
  63
  64 #ifdef __APPLE__
  65 #include <get_compat.h>
  66 #else
  67 #define COMPAT_MODE(a,b) (1)
  68 #endif /* __APPLE__ */
  69
  70 void    a_gid(const char *);
  71 void    a_uid(const char *);
  72 void    chownerr(const char *);
  73 static uid_t    id(const char *, const char *);
  74 void    usage(void);
  75
  76 uid_t uid;
  77 gid_t gid;
  78 int ischown;
  79 #ifdef __APPLE__
  80 int isnumeric = 0;
  81 #endif
  82 const char *gname;
  83
  84 int
  85 main(int argc, char **argv)
  86 {
  87         FTS *ftsp;
  88         FTSENT *p;
  89         int Hflag, Lflag, Pflag, Rflag, fflag, hflag, vflag;
  90         int ch, fts_options, rval;
  91         char *cp;
  92         int unix2003_compat = 0;
  93         int symlink_found = 0;
  94
  95         if (argc < 1)
  96                 usage();
  97         cp = strrchr(argv[0], '/');
  98         cp = (cp != NULL) ? cp + 1 : argv[0];
  99         ischown = (strcmp(cp, "chown") == 0);
 100
 101         Hflag = Lflag = Pflag = Rflag = fflag = hflag = vflag = 0;
 102 #ifdef __APPLE__
 103         while ((ch = getopt(argc, argv, "HLPRfhnv")) != -1)
 104 #else
 105         while ((ch = getopt(argc, argv, "HLPRfhv")) != -1)
 106 #endif
 107                 switch (ch) {
 108                 case 'H':
 109                         Hflag = 1;
 110                         Lflag = Pflag = 0;
 111                         break;
 112                 case 'L':
 113                         Lflag = 1;
 114                         Hflag = Pflag = 0;
 115                         break;
 116                 case 'P':
 117                         Pflag = 1;
 118                         Hflag = Lflag = 0;
 119                         break;
 120                 case 'R':
 121                         Rflag = 1;
 122                         break;
 123                 case 'f':
 124                         fflag = 1;
 125                         break;
 126                 case 'h':
 127                         hflag = 1;
 128                         break;
 129 #ifdef __APPLE__
 130                 case 'n':
 131                         isnumeric = 1;
 132                         break;
 133 #endif
 134                 case 'v':
 135                         vflag = 1;
 136                         break;
 137                 case '?':
 138                 default:
 139                         usage();
 140                 }
 141         argv += optind;
 142         argc -= optind;
 143
 144         if (argc < 2)
 145                 usage();
 146         if (!Rflag && (Hflag || Lflag || Pflag))
 147                 warnx("options -H, -L, -P only useful with -R");
 148
 149         if (Rflag) {
 150                 fts_options = FTS_PHYSICAL;
 151                 if (hflag && (Hflag || Lflag))
 152                         errx(1, "the -R%c and -h options may not be "
 153                             "specified together", Hflag ? 'H' : 'L');
 154                 if (Hflag)
 155                         fts_options |= FTS_COMFOLLOW;
 156                 else if (Lflag) {
 157                         fts_options &= ~FTS_PHYSICAL;
 158                         fts_options |= FTS_LOGICAL;
 159                 }
 160         } else
 161                 fts_options = hflag ? FTS_PHYSICAL : FTS_LOGICAL;
 162
 163         uid = (uid_t)-1;
 164         gid = (gid_t)-1;
 165         if (ischown) {
 166                 unix2003_compat = COMPAT_MODE("bin/chown", "Unix2003");
 167                 if ((cp = strchr(*argv, ':')) != NULL) {
 168                         *cp++ = '\0';
 169                         a_gid(cp);
 170                 }
 171 #ifdef SUPPORT_DOT
 172                 else if ((cp = strchr(*argv, '.')) != NULL) {
 173                         warnx("separation of user and group with a period is deprecated");
 174                         *cp++ = '\0';
 175                         a_gid(cp);
 176                 }
 177 #endif
 178                 a_uid(*argv);
 179         } else {
 180                 unix2003_compat = COMPAT_MODE("bin/chgrp", "Unix2003");
 181                 a_gid(*argv);
 182         }
 183
 184         if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL)
 185                 err(1, NULL);
 186
 187         for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
 188                 symlink_found = 0;
 189                 switch (p->fts_info) {
 190                 case FTS_D:                     /* Change it at FTS_DP. */
 191                         if (!Rflag)
 192                                 fts_set(ftsp, p, FTS_SKIP);
 193                         continue;
 194                 case FTS_DNR:                   /* Warn, chown. */
 195                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 196                         rval = 1;
 197                         break;
 198                 case FTS_ERR:                   /* Warn, continue. */
 199                 case FTS_NS:
 200                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 201                         rval = 1;
 202                         continue;
 203                 case FTS_SL:
 204                 case FTS_SLNONE:
 205                         /*
 206                          * The only symlinks that end up here are ones that
 207                          * don't point to anything and ones that we found
 208                          * doing a physical walk.
 209                          */
 210                         if (hflag)
 211                                 break;
 212                         else {
 213                                 symlink_found = 1;
 214                                 if (unix2003_compat) {
 215                                         if (Hflag || Lflag) {       /* -H or -L was specified */
 216                                                 if (p->fts_errno) {
 217                                                         warnx("%s: %s", p->fts_name, strerror(p->fts_errno));
 218                                                         rval = 1;
 219                                                         continue;
 220                                                 }
 221                                         }
 222                                         break; /* Otherwise symlinks keep going */
 223                                 }
 224                                 continue;
 225                         }
 226                 default:
 227                         break;
 228                 }
 229                 if (unix2003_compat) {
 230                         /* Can only avoid updating times if both uid and gid are -1 */
 231                         if ((uid == (uid_t)-1) && (gid == (gid_t)-1))
 232                                 continue;
 233                 } else {
 234                         if ((uid == (uid_t)-1 || uid == p->fts_statp->st_uid) &&
 235                             (gid == (gid_t)-1 || gid == p->fts_statp->st_gid))
 236                                 continue;
 237                 }
 238                 if (((hflag || symlink_found) ? lchown : chown)(p->fts_accpath, uid, gid) == -1) {
 239                         if (!fflag) {
 240                                 chownerr(p->fts_path);
 241                                 rval = 1;
 242                         }
 243                 } else {
 244                         if (vflag)
 245                                 printf("%s\n", p->fts_path);
 246                 }
 247         }
 248         if (errno)
 249                 err(1, "fts_read");
 250         exit(rval);
 251 }
 252
 253 void
 254 a_gid(const char *s)
 255 {
 256         struct group *gr;
 257
 258         if (*s == '\0')                 /* Argument was "uid[:.]". */
 259                 return;
 260         gname = s;
 261 #ifdef __APPLE__
 262         gid = (!isnumeric && ((gr = getgrnam(s)) != NULL)) ? gr->gr_gid : id(s, "group");
 263 #else
 264         gid = ((gr = getgrnam(s)) != NULL) ? gr->gr_gid : id(s, "group");
 265 #endif
 266 }
 267
 268 void
 269 a_uid(const char *s)
 270 {
 271         struct passwd *pw;
 272
 273         if (*s == '\0')                 /* Argument was "[:.]gid". */
 274                 return;
 275 #ifdef __APPLE__
 276         uid = (!isnumeric && ((pw = getpwnam(s)) != NULL)) ? pw->pw_uid : id(s, "user");
 277 #else
 278         uid = ((pw = getpwnam(s)) != NULL) ? pw->pw_uid : id(s, "user");
 279 #endif
 280 }
 281
 282 static uid_t
 283 id(const char *name, const char *type)
 284 {
 285         unsigned long val;
 286         char *ep;
 287
 288         errno = 0;
 289         val = strtoul(name, &ep, 10);
 290         if (errno || *ep != '\0' || val > UID_MAX)
 291                 errx(1, "%s: illegal %s name", name, type);
 292         return (uid_t)val;
 293 }
 294
 295 void
 296 chownerr(const char *file)
 297 {
 298         static uid_t euid = -1;
 299         static int ngroups = -1;
 300         gid_t groups[NGROUPS_MAX];
 301
 302         /* Check for chown without being root. */
 303         if (errno != EPERM || (uid != (uid_t)-1 &&
 304             euid == (uid_t)-1 && (euid = geteuid()) != 0)) {
 305                 warn("%s", file);
 306                 return;
 307         }
 308
 309         /* Check group membership; kernel just returns EPERM. */
 310         if (gid != (gid_t)-1 && ngroups == -1 &&
 311             euid == (uid_t)-1 && (euid = geteuid()) != 0) {
 312                 ngroups = getgroups(NGROUPS_MAX, groups);
 313                 while (--ngroups >= 0 && gid != groups[ngroups]);
 314                 if (ngroups < 0) {
 315                         warnx("you are not a member of group %s", gname);
 316                         return;
 317                 }
 318         }
 319         warn("%s", file);
 320 }
 321
 322 void
 323 usage(void)
 324 {
 325
 326         if (ischown)
 327                 (void)fprintf(stderr, "%s\n%s\n",
 328 #ifdef __APPLE__
 329                     "usage: chown [-fhnv] [-R [-H | -L | -P]] owner[:group]"
 330                     " file ...",
 331                     "       chown [-fhnv] [-R [-H | -L | -P]] :group file ...");
 332 #else
 333                     "usage: chown [-fhv] [-R [-H | -L | -P]] owner[:group]"
 334                     " file ...",
 335                     "       chown [-fhv] [-R [-H | -L | -P]] :group file ...");
 336 #endif
 337         else
 338                 (void)fprintf(stderr, "%s\n",
 339 #ifdef __APPLE__
 340                     "usage: chgrp [-fhnv] [-R [-H | -L | -P]] group file ...");
 341 #else
 342                     "usage: chgrp [-fhv] [-R [-H | -L | -P]] group file ...");
 343 #endif
 344         exit(1);
 345 }