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