freebsd-dev/usr.sbin/chown/chown.c

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
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* Copyright (c) 1988, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if 0
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#ifndef lint
static const char copyright[] =
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"@(#) Copyright (c) 1988, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)chown.c 8.8 (Berkeley) 4/4/94";
#endif /* not lint */
#endif
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#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
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#include <sys/param.h>
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
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#include <fts.h>
#include <grp.h>
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#include <libgen.h>
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#include <pwd.h>
#include <signal.h>
#include <stddef.h>
#include <stdint.h>
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static void a_gid(const char *);
static void a_uid(const char *);
static void chownerr(const char *);
static uid_t id(const char *, const char *);
static void usage(void);
static void print_info(const FTSENT *, int);
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static uid_t uid;
static gid_t gid;
static int ischown;
static const char *gname;
static volatile sig_atomic_t siginfo;
static void
siginfo_handler(int sig __unused)
{
siginfo = 1;
}
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int
main(int argc, char **argv)
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{
FTS *ftsp;
FTSENT *p;
int Hflag, Lflag, Rflag, fflag, hflag, vflag, xflag;
int ch, fts_options, rval;
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char *cp;
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ischown = (strcmp(basename(argv[0]), "chown") == 0);
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Hflag = Lflag = Rflag = fflag = hflag = vflag = xflag = 0;
while ((ch = getopt(argc, argv, "HLPRfhvx")) != -1)
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switch (ch) {
case 'H':
Hflag = 1;
Lflag = 0;
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break;
case 'L':
Lflag = 1;
Hflag = 0;
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break;
case 'P':
Hflag = Lflag = 0;
break;
case 'R':
Rflag = 1;
break;
case 'f':
fflag = 1;
break;
case 'h':
hflag = 1;
break;
case 'v':
vflag++;
break;
case 'x':
xflag = 1;
break;
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case '?':
default:
usage();
}
argv += optind;
argc -= optind;
if (argc < 2)
usage();
(void)signal(SIGINFO, siginfo_handler);
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if (Rflag) {
if (hflag && (Hflag || Lflag))
errx(1, "the -R%c and -h options may not be "
"specified together", Hflag ? 'H' : 'L');
if (Lflag) {
fts_options = FTS_LOGICAL;
} else {
fts_options = FTS_PHYSICAL;
if (Hflag) {
fts_options |= FTS_COMFOLLOW;
}
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}
} else if (hflag) {
fts_options = FTS_PHYSICAL;
} else {
fts_options = FTS_LOGICAL;
}
if (xflag)
fts_options |= FTS_XDEV;
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uid = (uid_t)-1;
gid = (gid_t)-1;
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if (ischown) {
if ((cp = strchr(*argv, ':')) != NULL) {
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*cp++ = '\0';
a_gid(cp);
}
#ifdef SUPPORT_DOT
else if ((cp = strchr(*argv, '.')) != NULL) {
warnx("separation of user and group with a period is deprecated");
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*cp++ = '\0';
a_gid(cp);
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}
#endif
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a_uid(*argv);
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} else
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a_gid(*argv);
if ((ftsp = fts_open(++argv, fts_options, NULL)) == NULL)
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err(1, NULL);
for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
int atflag;
if ((fts_options & FTS_LOGICAL) ||
((fts_options & FTS_COMFOLLOW) &&
p->fts_level == FTS_ROOTLEVEL))
atflag = 0;
else
atflag = AT_SYMLINK_NOFOLLOW;
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switch (p->fts_info) {
case FTS_D: /* Change it at FTS_DP. */
if (!Rflag)
fts_set(ftsp, p, FTS_SKIP);
continue;
case FTS_DNR: /* Warn, chown. */
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warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
rval = 1;
break;
case FTS_ERR: /* Warn, continue. */
case FTS_NS:
warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
rval = 1;
continue;
default:
break;
}
if (siginfo) {
print_info(p, 2);
siginfo = 0;
}
if ((uid == (uid_t)-1 || uid == p->fts_statp->st_uid) &&
(gid == (gid_t)-1 || gid == p->fts_statp->st_gid))
continue;
if (fchownat(AT_FDCWD, p->fts_accpath, uid, gid, atflag)
== -1 && !fflag) {
chownerr(p->fts_path);
rval = 1;
} else if (vflag)
print_info(p, vflag);
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}
if (errno)
err(1, "fts_read");
exit(rval);
}
static void
a_gid(const char *s)
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{
struct group *gr;
if (*s == '\0') /* Argument was "uid[:.]". */
return;
gname = s;
gid = ((gr = getgrnam(s)) != NULL) ? gr->gr_gid : id(s, "group");
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}
static void
a_uid(const char *s)
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{
struct passwd *pw;
if (*s == '\0') /* Argument was "[:.]gid". */
return;
uid = ((pw = getpwnam(s)) != NULL) ? pw->pw_uid : id(s, "user");
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}
static uid_t
id(const char *name, const char *type)
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{
unsigned long val;
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char *ep;
errno = 0;
val = strtoul(name, &ep, 10);
_Static_assert(UID_MAX >= GID_MAX, "UID MAX less than GID MAX");
if (errno || *ep != '\0' || val > UID_MAX)
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errx(1, "%s: illegal %s name", name, type);
return (val);
}
static void
chownerr(const char *file)
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{
static uid_t euid = -1;
static int ngroups = -1;
static long ngroups_max;
gid_t *groups;
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/* Check for chown without being root. */
if (errno != EPERM || (uid != (uid_t)-1 &&
euid == (uid_t)-1 && (euid = geteuid()) != 0)) {
warn("%s", file);
return;
}
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/* Check group membership; kernel just returns EPERM. */
if (gid != (gid_t)-1 && ngroups == -1 &&
euid == (uid_t)-1 && (euid = geteuid()) != 0) {
ngroups_max = sysconf(_SC_NGROUPS_MAX) + 1;
if ((groups = malloc(sizeof(gid_t) * ngroups_max)) == NULL)
err(1, "malloc");
ngroups = getgroups(ngroups_max, groups);
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while (--ngroups >= 0 && gid != groups[ngroups]);
free(groups);
if (ngroups < 0) {
warnx("you are not a member of group %s", gname);
return;
}
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}
warn("%s", file);
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}
static void
usage(void)
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{
if (ischown)
(void)fprintf(stderr, "%s\n%s\n",
"usage: chown [-fhvx] [-R [-H | -L | -P]] owner[:group]"
" file ...",
" chown [-fhvx] [-R [-H | -L | -P]] :group file ...");
else
(void)fprintf(stderr, "%s\n",
"usage: chgrp [-fhvx] [-R [-H | -L | -P]] group file ...");
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exit(1);
}
static void
print_info(const FTSENT *p, int vflag)
{
printf("%s", p->fts_path);
if (vflag > 1) {
if (ischown) {
printf(": %ju:%ju -> %ju:%ju",
(uintmax_t)p->fts_statp->st_uid,
(uintmax_t)p->fts_statp->st_gid,
(uid == (uid_t)-1) ?
(uintmax_t)p->fts_statp->st_uid : (uintmax_t)uid,
(gid == (gid_t)-1) ?
(uintmax_t)p->fts_statp->st_gid : (uintmax_t)gid);
} else {
printf(": %ju -> %ju", (uintmax_t)p->fts_statp->st_gid,
(gid == (gid_t)-1) ?
(uintmax_t)p->fts_statp->st_gid : (uintmax_t)gid);
}
}
printf("\n");
}