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. 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: src/usr.sbin/chown/chown.c,v 1.15.2.3 2002/08/07 21:24:33 schweikh Exp $
  32  * $DragonFly: src/usr.sbin/chown/chown.c,v 1.8 2004/12/18 22:48:02 swildner Exp $
  33  */
  34
  35 #include <sys/param.h>
  36 #include <sys/stat.h>
  37
  38 #include <ctype.h>
  39 #include <dirent.h>
  40 #include <err.h>
  41 #include <errno.h>
  42 #include <fts.h>
  43 #include <grp.h>
  44 #include <pwd.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <unistd.h>
  49
  50 static void     a_gid(char *);
  51 static void     a_uid(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       Rflag, ischown, fflag, vflag;
  59 static char      *gname, *myname;
  60
  61 int
  62 main(int argc, char **argv)
  63 {
  64         FTS *ftsp;
  65         FTSENT *p;
  66         int Hflag, Lflag, Pflag, ch, fts_options, hflag, rval;
  67         char *cp;
  68
  69         myname = (cp = strrchr(*argv, '/')) ? cp + 1 : *argv;
  70         ischown = myname[2] == 'o';
  71
  72         Hflag = Lflag = Pflag = hflag = vflag = 0;
  73         while ((ch = getopt(argc, argv, "HLPRfhv")) != -1)
  74                 switch (ch) {
  75                 case 'H':
  76                         Hflag = 1;
  77                         Lflag = Pflag = 0;
  78                         break;
  79                 case 'L':
  80                         Lflag = 1;
  81                         Hflag = Pflag = 0;
  82                         break;
  83                 case 'P':
  84                         Pflag = 1;
  85                         Hflag = Lflag = 0;
  86                         break;
  87                 case 'R':
  88                         Rflag = 1;
  89                         break;
  90                 case 'f':
  91                         fflag = 1;
  92                         break;
  93                 case 'h':
  94                         hflag = 1;
  95                         break;
  96                 case 'v':
  97                         vflag++;
  98                         break;
  99                 default:
 100                         usage();
 101                 }
 102         argv += optind;
 103         argc -= optind;
 104
 105         if (argc < 2)
 106                 usage();
 107
 108         fts_options = FTS_PHYSICAL;
 109         if (Rflag) {
 110                 if (hflag && (Lflag || Hflag))
 111                         errx(1, "the -R and -h options may not be specified together");
 112                 if (Hflag)
 113                         fts_options |= FTS_COMFOLLOW;
 114                 if (Lflag) {
 115                         fts_options &= ~FTS_PHYSICAL;
 116                         fts_options |= FTS_LOGICAL;
 117                 }
 118         }
 119
 120         uid = gid = -1;
 121         if (ischown) {
 122                 if ((cp = strchr(*argv, ':')) != NULL) {
 123                         *cp++ = '\0';
 124                         a_gid(cp);
 125                 }
 126 #ifdef SUPPORT_DOT
 127                 else if ((cp = strchr(*argv, '.')) != NULL) {
 128                         warnx("separation of user and group with a period is deprecated");
 129                         *cp++ = '\0';
 130                         a_gid(cp);
 131                 }
 132 #endif
 133                 a_uid(*argv);
 134         } else
 135                 a_gid(*argv);
 136
 137         if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL)
 138                 err(1, NULL);
 139
 140         for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
 141                 switch (p->fts_info) {
 142                 case FTS_D:                     /* Change it at FTS_DP. */
 143                         if (!Rflag)
 144                                 fts_set(ftsp, p, FTS_SKIP);
 145                         continue;
 146                 case FTS_DNR:                   /* Warn, chown, continue. */
 147                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 148                         rval = 1;
 149                         break;
 150                 case FTS_ERR:                   /* Warn, continue. */
 151                 case FTS_NS:
 152                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 153                         rval = 1;
 154                         continue;
 155                 case FTS_SL:                    /* Ignore. */
 156                 case FTS_SLNONE:
 157                         /*
 158                          * The only symlinks that end up here are ones that
 159                          * don't point to anything and ones that we found
 160                          * doing a physical walk.
 161                          */
 162                         if (hflag)
 163                                 break;
 164                         else
 165                                 continue;
 166                 default:
 167                         break;
 168                 }
 169                 if ((uid == (uid_t)(-1) || uid == p->fts_statp->st_uid) &&
 170                     (gid == (gid_t)(-1) || gid == p->fts_statp->st_gid))
 171                         continue;
 172                 if (hflag) {
 173                         if (lchown(p->fts_accpath, uid, gid) && !fflag) {
 174                                 chownerr(p->fts_path);
 175                                 rval = 1;
 176                         } else {
 177                                 if (vflag)
 178                                         printf("%s\n", p->fts_accpath);
 179                         }
 180                 } else {
 181                         if (chown(p->fts_accpath, uid, gid) && !fflag) {
 182                                 chownerr(p->fts_path);
 183                                 rval = 1;
 184                         } else {
 185                                 if (vflag) {
 186                                         printf("%s", p->fts_accpath);
 187                                          if (vflag > 1) {
 188                                                 if (ischown) {
 189                                                         printf(": %d:%d -> %d:%d",
 190                                                                 (int)p->fts_statp->st_uid,
 191                                                                 (int)p->fts_statp->st_gid,
 192                                                                 (uid == (uid_t)-1) ?
 193                                                                 (int)p->fts_statp->st_uid :
 194                                                                 (int)uid,
 195                                                                 (gid == (gid_t)-1) ?
 196                                                                 (int) p->fts_statp->st_gid :
 197                                                                 (int)gid);
 198                                                 } else {
 199                                                         printf(": %d -> %d",
 200                                                                 (int)p->fts_statp->st_gid,
 201                                                                 (gid == (gid_t)-1) ?
 202                                                                 (int)p->fts_statp->st_gid :
 203                                                                 (int)gid);
 204                                                  }
 205                                          }
 206                                          printf("\n");
 207                                 }
 208                         }
 209                 }
 210         }
 211         if (errno)
 212                 err(1, "fts_read");
 213         exit(rval);
 214 }
 215
 216 static void
 217 a_gid(char *s)
 218 {
 219         struct group *gr;
 220
 221         if (*s == '\0')                 /* Argument was "uid[:.]". */
 222                 return;
 223         gname = s;
 224         gid = ((gr = getgrnam(s)) == NULL) ? id(s, "group") : gr->gr_gid;
 225 }
 226
 227 static void
 228 a_uid(char *s)
 229 {
 230         struct passwd *pw;
 231
 232         if (*s == '\0')                 /* Argument was "[:.]gid". */
 233                 return;
 234         uid = ((pw = getpwnam(s)) == NULL) ? id(s, "user") : pw->pw_uid;
 235 }
 236
 237 static uid_t
 238 id(const char *name, const char *type)
 239 {
 240         u_long val;
 241         char *ep;
 242
 243         /*
 244          * XXX
 245          * We know that uid_t's and gid_t's are unsigned longs.
 246          */
 247         errno = 0;
 248         val = strtoul(name, &ep, 10);
 249         if (errno)
 250                 err(1, "%s", name);
 251         if (*ep != '\0')
 252                 errx(1, "%s: illegal %s name", name, type);
 253         return (val);
 254 }
 255
 256 static void
 257 chownerr(const char *file)
 258 {
 259         static uid_t euid = -1;
 260         static int ngroups = -1;
 261         gid_t groups[NGROUPS];
 262
 263         /* Check for chown without being root. */
 264         if (errno != EPERM ||
 265             (uid != (uid_t)(-1) && euid == (uid_t)(-1) && (euid = geteuid()) != 0))
 266                 err(1, "%s", file);
 267
 268         /* Check group membership; kernel just returns EPERM. */
 269         if (gid != (gid_t)(-1) && ngroups == -1 &&
 270             euid == (uid_t)(-1) && (euid = geteuid()) != 0) {
 271                 ngroups = getgroups(NGROUPS, groups);
 272                 while (--ngroups >= 0 && gid != groups[ngroups]);
 273                 if (ngroups < 0)
 274                         errx(1, "you are not a member of group %s", gname);
 275         }
 276         warn("%s", file);
 277 }
 278
 279 static void
 280 usage(void)
 281 {
 282         fprintf(stderr, "%s\n%s\n%s\n",
 283             "usage: chown [-R [-H | -L | -P]] [-f] [-h] [-v] owner[:group] file ...",
 284             "       chown [-R [-H | -L | -P]] [-f] [-h] [-v] :group file ...",
 285             "       chgrp [-R [-H | -L | -P]] [-f] [-h] [-v] group file ...");
 286         exit(1);
 287 }