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 const char *gname;
  80
  81 int
  82 main(int argc, char **argv)
  83 {
  84         FTS *ftsp;
  85         FTSENT *p;
  86         int Hflag, Lflag, Pflag, Rflag, fflag, hflag, vflag;
  87         int ch, fts_options, rval;
  88         char *cp;
  89         int unix2003_compat = 0;
  90         int symlink_found = 0;
  91
  92         if (argc < 1)
  93                 usage();
  94         cp = strrchr(argv[0], '/');
  95         cp = (cp != NULL) ? cp + 1 : argv[0];
  96         ischown = (strcmp(cp, "chown") == 0);
  97
  98         Hflag = Lflag = Pflag = Rflag = fflag = hflag = vflag = 0;
  99         while ((ch = getopt(argc, argv, "HLPRfhv")) != -1)
 100                 switch (ch) {
 101                 case 'H':
 102                         Hflag = 1;
 103                         Lflag = Pflag = 0;
 104                         break;
 105                 case 'L':
 106                         Lflag = 1;
 107                         Hflag = Pflag = 0;
 108                         break;
 109                 case 'P':
 110                         Pflag = 1;
 111                         Hflag = Lflag = 0;
 112                         break;
 113                 case 'R':
 114                         Rflag = 1;
 115                         break;
 116                 case 'f':
 117                         fflag = 1;
 118                         break;
 119                 case 'h':
 120                         hflag = 1;
 121                         break;
 122                 case 'v':
 123                         vflag = 1;
 124                         break;
 125                 case '?':
 126                 default:
 127                         usage();
 128                 }
 129         argv += optind;
 130         argc -= optind;
 131
 132         if (argc < 2)
 133                 usage();
 134         if (!Rflag && (Hflag || Lflag || Pflag))
 135                 warnx("options -H, -L, -P only useful with -R");
 136
 137         if (Rflag) {
 138                 fts_options = FTS_PHYSICAL;
 139                 if (hflag && (Hflag || Lflag))
 140                         errx(1, "the -R%c and -h options may not be "
 141                             "specified together", Hflag ? 'H' : 'L');
 142                 if (Hflag)
 143                         fts_options |= FTS_COMFOLLOW;
 144                 else if (Lflag) {
 145                         fts_options &= ~FTS_PHYSICAL;
 146                         fts_options |= FTS_LOGICAL;
 147                 }
 148         } else
 149                 fts_options = hflag ? FTS_PHYSICAL : FTS_LOGICAL;
 150
 151         uid = (uid_t)-1;
 152         gid = (gid_t)-1;
 153         if (ischown) {
 154                 unix2003_compat = COMPAT_MODE("bin/chown", "Unix2003");
 155                 if ((cp = strchr(*argv, ':')) != NULL) {
 156                         *cp++ = '\0';
 157                         a_gid(cp);
 158                 }
 159 #ifdef SUPPORT_DOT
 160                 else if ((cp = strchr(*argv, '.')) != NULL) {
 161                         warnx("separation of user and group with a period is deprecated");
 162                         *cp++ = '\0';
 163                         a_gid(cp);
 164                 }
 165 #endif
 166                 a_uid(*argv);
 167         } else {
 168                 unix2003_compat = COMPAT_MODE("bin/chgrp", "Unix2003");
 169                 a_gid(*argv);
 170         }
 171
 172         if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL)
 173                 err(1, NULL);
 174
 175         for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
 176                 symlink_found = 0;
 177                 switch (p->fts_info) {
 178                 case FTS_D:                     /* Change it at FTS_DP. */
 179                         if (!Rflag)
 180                                 fts_set(ftsp, p, FTS_SKIP);
 181                         continue;
 182                 case FTS_DNR:                   /* Warn, chown. */
 183                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 184                         rval = 1;
 185                         break;
 186                 case FTS_ERR:                   /* Warn, continue. */
 187                 case FTS_NS:
 188                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 189                         rval = 1;
 190                         continue;
 191                 case FTS_SL:
 192                 case FTS_SLNONE:
 193                         /*
 194                          * The only symlinks that end up here are ones that
 195                          * don't point to anything and ones that we found
 196                          * doing a physical walk.
 197                          */
 198                         if (hflag)
 199                                 break;
 200                         else {
 201                                 symlink_found = 1;
 202                                 if (unix2003_compat) {
 203                                         if (Hflag || Lflag) {       /* -H or -L was specified */
 204                                                 if (p->fts_errno) {
 205                                                         warnx("%s: %s", p->fts_name, strerror(p->fts_errno));
 206                                                         rval = 1;
 207                                                         continue;
 208                                                 }
 209                                         }
 210                                         break; /* Otherwise symlinks keep going */
 211                                 }
 212                                 continue;
 213                         }
 214                 default:
 215                         break;
 216                 }
 217                 if (unix2003_compat) {
 218                         /* Can only avoid updating times if both uid and gid are -1 */
 219                         if ((uid == (uid_t)-1) && (gid == (gid_t)-1))
 220                                 continue;
 221                 } else {
 222                         if ((uid == (uid_t)-1 || uid == p->fts_statp->st_uid) &&
 223                             (gid == (gid_t)-1 || gid == p->fts_statp->st_gid))
 224                                 continue;
 225                 }
 226                 if (((hflag || symlink_found) ? lchown : chown)(p->fts_accpath, uid, gid) == -1) {
 227                         if (!fflag) {
 228                                 chownerr(p->fts_path);
 229                                 rval = 1;
 230                         }
 231                 } else {
 232                         if (vflag)
 233                                 printf("%s\n", p->fts_path);
 234                 }
 235         }
 236         if (errno)
 237                 err(1, "fts_read");
 238         exit(rval);
 239 }
 240
 241 void
 242 a_gid(const char *s)
 243 {
 244         struct group *gr;
 245
 246         if (*s == '\0')                 /* Argument was "uid[:.]". */
 247                 return;
 248         gname = s;
 249         gid = ((gr = getgrnam(s)) != NULL) ? gr->gr_gid : id(s, "group");
 250 }
 251
 252 void
 253 a_uid(const char *s)
 254 {
 255         struct passwd *pw;
 256
 257         if (*s == '\0')                 /* Argument was "[:.]gid". */
 258                 return;
 259         uid = ((pw = getpwnam(s)) != NULL) ? pw->pw_uid : id(s, "user");
 260 }
 261
 262 static uid_t
 263 id(const char *name, const char *type)
 264 {
 265         unsigned long val;
 266         char *ep;
 267
 268         errno = 0;
 269         val = strtoul(name, &ep, 10);
 270         if (errno || *ep != '\0' || val > UID_MAX)
 271                 errx(1, "%s: illegal %s name", name, type);
 272         return (uid_t)val;
 273 }
 274
 275 void
 276 chownerr(const char *file)
 277 {
 278         static uid_t euid = -1;
 279         static int ngroups = -1;
 280         gid_t groups[NGROUPS_MAX];
 281
 282         /* Check for chown without being root. */
 283         if (errno != EPERM || (uid != (uid_t)-1 &&
 284             euid == (uid_t)-1 && (euid = geteuid()) != 0)) {
 285                 warn("%s", file);
 286                 return;
 287         }
 288
 289         /* Check group membership; kernel just returns EPERM. */
 290         if (gid != (gid_t)-1 && ngroups == -1 &&
 291             euid == (uid_t)-1 && (euid = geteuid()) != 0) {
 292                 ngroups = getgroups(NGROUPS_MAX, groups);
 293                 while (--ngroups >= 0 && gid != groups[ngroups]);
 294                 if (ngroups < 0) {
 295                         warnx("you are not a member of group %s", gname);
 296                         return;
 297                 }
 298         }
 299         warn("%s", file);
 300 }
 301
 302 void
 303 usage(void)
 304 {
 305
 306         if (ischown)
 307                 (void)fprintf(stderr, "%s\n%s\n",
 308                     "usage: chown [-fhv] [-R [-H | -L | -P]] owner[:group]"
 309                     " file ...",
 310                     "       chown [-fhv] [-R [-H | -L | -P]] :group file ...");
 311         else
 312                 (void)fprintf(stderr, "%s\n",
 313                     "usage: chgrp [-fhv] [-R [-H | -L | -P]] group file ...");
 314         exit(1);
 315 }