usr.sbin/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  * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California.  All rights reserved.
  34  * @(#)chown.c  8.8 (Berkeley) 4/4/94
  35  * $FreeBSD: src/usr.sbin/chown/chown.c,v 1.15.2.3 2002/08/07 21:24:33 schweikh Exp $
  36  * $DragonFly: src/usr.sbin/chown/chown.c,v 1.8 2004/12/18 22:48:02 swildner Exp $
  37  */
  38
  39 #include <sys/param.h>
  40 #include <sys/stat.h>
  41
  42 #include <ctype.h>
  43 #include <dirent.h>
  44 #include <err.h>
  45 #include <errno.h>
  46 #include <fts.h>
  47 #include <grp.h>
  48 #include <pwd.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52 #include <unistd.h>
  53
  54 static void     a_gid(char *);
  55 static void     a_uid(char *);
  56 static void     chownerr(const char *);
  57 static uid_t    id(const char *, const char *);
  58 static void     usage(void);
  59
  60 static uid_t     uid;
  61 static gid_t     gid;
  62 static int       Rflag, ischown, fflag, vflag;
  63 static char      *gname, *myname;
  64
  65 int
  66 main(int argc, char **argv)
  67 {
  68         FTS *ftsp;
  69         FTSENT *p;
  70         int Hflag, Lflag, Pflag, ch, fts_options, hflag, rval;
  71         char *cp;
  72
  73         myname = (cp = strrchr(*argv, '/')) ? cp + 1 : *argv;
  74         ischown = myname[2] == 'o';
  75
  76         Hflag = Lflag = Pflag = hflag = vflag = 0;
  77         while ((ch = getopt(argc, argv, "HLPRfhv")) != -1)
  78                 switch (ch) {
  79                 case 'H':
  80                         Hflag = 1;
  81                         Lflag = Pflag = 0;
  82                         break;
  83                 case 'L':
  84                         Lflag = 1;
  85                         Hflag = Pflag = 0;
  86                         break;
  87                 case 'P':
  88                         Pflag = 1;
  89                         Hflag = Lflag = 0;
  90                         break;
  91                 case 'R':
  92                         Rflag = 1;
  93                         break;
  94                 case 'f':
  95                         fflag = 1;
  96                         break;
  97                 case 'h':
  98                         hflag = 1;
  99                         break;
 100                 case 'v':
 101                         vflag++;
 102                         break;
 103                 default:
 104                         usage();
 105                 }
 106         argv += optind;
 107         argc -= optind;
 108
 109         if (argc < 2)
 110                 usage();
 111
 112         fts_options = FTS_PHYSICAL;
 113         if (Rflag) {
 114                 if (hflag && (Lflag || Hflag))
 115                         errx(1, "the -R and -h options may not be specified together");
 116                 if (Hflag)
 117                         fts_options |= FTS_COMFOLLOW;
 118                 if (Lflag) {
 119                         fts_options &= ~FTS_PHYSICAL;
 120                         fts_options |= FTS_LOGICAL;
 121                 }
 122         }
 123
 124         uid = gid = -1;
 125         if (ischown) {
 126                 if ((cp = strchr(*argv, ':')) != NULL) {
 127                         *cp++ = '\0';
 128                         a_gid(cp);
 129                 }
 130 #ifdef SUPPORT_DOT
 131                 else if ((cp = strchr(*argv, '.')) != NULL) {
 132                         warnx("separation of user and group with a period is deprecated");
 133                         *cp++ = '\0';
 134                         a_gid(cp);
 135                 }
 136 #endif
 137                 a_uid(*argv);
 138         } else
 139                 a_gid(*argv);
 140
 141         if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL)
 142                 err(1, NULL);
 143
 144         for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
 145                 switch (p->fts_info) {
 146                 case FTS_D:                     /* Change it at FTS_DP. */
 147                         if (!Rflag)
 148                                 fts_set(ftsp, p, FTS_SKIP);
 149                         continue;
 150                 case FTS_DNR:                   /* Warn, chown, continue. */
 151                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 152                         rval = 1;
 153                         break;
 154                 case FTS_ERR:                   /* Warn, continue. */
 155                 case FTS_NS:
 156                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 157                         rval = 1;
 158                         continue;
 159                 case FTS_SL:                    /* Ignore. */
 160                 case FTS_SLNONE:
 161                         /*
 162                          * The only symlinks that end up here are ones that
 163                          * don't point to anything and ones that we found
 164                          * doing a physical walk.
 165                          */
 166                         if (hflag)
 167                                 break;
 168                         else
 169                                 continue;
 170                 default:
 171                         break;
 172                 }
 173                 if ((uid == (uid_t)(-1) || uid == p->fts_statp->st_uid) &&
 174                     (gid == (gid_t)(-1) || gid == p->fts_statp->st_gid))
 175                         continue;
 176                 if (hflag) {
 177                         if (lchown(p->fts_accpath, uid, gid) && !fflag) {
 178                                 chownerr(p->fts_path);
 179                                 rval = 1;
 180                         } else {
 181                                 if (vflag)
 182                                         printf("%s\n", p->fts_accpath);
 183                         }
 184                 } else {
 185                         if (chown(p->fts_accpath, uid, gid) && !fflag) {
 186                                 chownerr(p->fts_path);
 187                                 rval = 1;
 188                         } else {
 189                                 if (vflag) {
 190                                         printf("%s", p->fts_accpath);
 191                                          if (vflag > 1) {
 192                                                 if (ischown) {
 193                                                         printf(": %d:%d -> %d:%d",
 194                                                                 (int)p->fts_statp->st_uid,
 195                                                                 (int)p->fts_statp->st_gid,
 196                                                                 (uid == (uid_t)-1) ?
 197                                                                 (int)p->fts_statp->st_uid :
 198                                                                 (int)uid,
 199                                                                 (gid == (gid_t)-1) ?
 200                                                                 (int) p->fts_statp->st_gid :
 201                                                                 (int)gid);
 202                                                 } else {
 203                                                         printf(": %d -> %d",
 204                                                                 (int)p->fts_statp->st_gid,
 205                                                                 (gid == (gid_t)-1) ?
 206                                                                 (int)p->fts_statp->st_gid :
 207                                                                 (int)gid);
 208                                                  }
 209                                          }
 210                                          printf("\n");
 211                                 }
 212                         }
 213                 }
 214         }
 215         if (errno)
 216                 err(1, "fts_read");
 217         exit(rval);
 218 }
 219
 220 static void
 221 a_gid(char *s)
 222 {
 223         struct group *gr;
 224
 225         if (*s == '\0')                 /* Argument was "uid[:.]". */
 226                 return;
 227         gname = s;
 228         gid = ((gr = getgrnam(s)) == NULL) ? id(s, "group") : gr->gr_gid;
 229 }
 230
 231 static void
 232 a_uid(char *s)
 233 {
 234         struct passwd *pw;
 235
 236         if (*s == '\0')                 /* Argument was "[:.]gid". */
 237                 return;
 238         uid = ((pw = getpwnam(s)) == NULL) ? id(s, "user") : pw->pw_uid;
 239 }
 240
 241 static uid_t
 242 id(const char *name, const char *type)
 243 {
 244         u_long val;
 245         char *ep;
 246
 247         /*
 248          * XXX
 249          * We know that uid_t's and gid_t's are unsigned longs.
 250          */
 251         errno = 0;
 252         val = strtoul(name, &ep, 10);
 253         if (errno)
 254                 err(1, "%s", name);
 255         if (*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         gid_t groups[NGROUPS];
 266
 267         /* Check for chown without being root. */
 268         if (errno != EPERM ||
 269             (uid != (uid_t)(-1) && euid == (uid_t)(-1) && (euid = geteuid()) != 0))
 270                 err(1, "%s", file);
 271
 272         /* Check group membership; kernel just returns EPERM. */
 273         if (gid != (gid_t)(-1) && ngroups == -1 &&
 274             euid == (uid_t)(-1) && (euid = geteuid()) != 0) {
 275                 ngroups = getgroups(NGROUPS, groups);
 276                 while (--ngroups >= 0 && gid != groups[ngroups]);
 277                 if (ngroups < 0)
 278                         errx(1, "you are not a member of group %s", gname);
 279         }
 280         warn("%s", file);
 281 }
 282
 283 static void
 284 usage(void)
 285 {
 286         fprintf(stderr, "%s\n%s\n%s\n",
 287             "usage: chown [-R [-H | -L | -P]] [-f] [-h] [-v] owner[:group] file ...",
 288             "       chown [-R [-H | -L | -P]] [-f] [-h] [-v] :group file ...",
 289             "       chgrp [-R [-H | -L | -P]] [-f] [-h] [-v] group file ...");
 290         exit(1);
 291 }