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