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/*
* filecap.c - A program that lists running processes with capabilities
* Copyright (c) 2009-10,2012,2017,2020 Red Hat Inc.
* All Rights Reserved.
*
* This software may be freely redistributed and/or modified under the
* terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1335, USA.
*
* Authors:
* Steve Grubb <sgrubb@redhat.com>
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "cap-ng.h"
#include <fcntl.h>
#include <ftw.h>
#ifndef FTW_CONTINUE
#define FTW_CONTINUE 0
#endif
static int show_all = 0, header = 0, capabilities = 0, cremove = 0;
static int single_file = 0;
static void usage(void)
{
fprintf(stderr,
"usage: filecap [-a | -d | /dir | /dir/file [cap1 cap2 ...] ]\n");
exit(1);
}
// Returns 1 on error and 0 otherwise
static int check_file(const char *fpath,
const struct stat *sb,
int typeflag_unused __attribute__ ((unused)),
struct FTW *s_unused __attribute__ ((unused)))
{
int ret = FTW_CONTINUE;
if (S_ISREG(sb->st_mode) == 0)
return ret;
int fd = open(fpath, O_RDONLY|O_CLOEXEC);
if (fd >= 0) {
capng_results_t rc;
int permitted = 0;
capng_clear(CAPNG_SELECT_BOTH);
if (capng_get_caps_fd(fd) < 0 && errno != ENODATA) {
fprintf(stderr,
"Unable to get capabilities of %s: %s\n",
fpath, strerror(errno));
if (single_file)
ret = 1;
}
rc = capng_have_capabilities(CAPNG_SELECT_CAPS);
if (rc == CAPNG_NONE) {
permitted = 1;
rc = capng_have_permitted_capabilities();
}
if (rc > CAPNG_NONE) {
if (header == 0) {
header = 1;
printf("%-9s %-20s capabilities rootid\n",
"set", "file");
}
int rootid = capng_get_rootid();
printf("%s %s ",
permitted ? "permitted" : "effective", fpath);
if (rc == CAPNG_FULL)
printf("full");
else
capng_print_caps_text(CAPNG_PRINT_STDOUT,
CAPNG_PERMITTED);
if (rootid != CAPNG_UNSET_ROOTID)
printf(" %d", rootid);
printf("\n");
}
close(fd);
}
return ret;
}
// Use cases:
// filecap
// filecap -a
// filecap /path/dir
// filecap /path/file
// filecap /path/file capability1 capability2 capability 3 ...
//
int main(int argc, char *argv[])
{
#if CAP_LAST_CAP < 31 || !defined (VFS_CAP_U32) || \
(!defined (HAVE_ATTR_XATTR_H) && !defined(HAVE_SYS_XATTR_H))
fprintf(stderr, "File based capabilities are not supported\n");
#else
char *path_env, *path = NULL, *dir = NULL;
struct stat sbuf;
int nftw_flags = FTW_PHYS;
int i, rc = 0;
if (argc >1) {
for (i=1; i<argc; i++) {
if (strcmp(argv[i], "-a") == 0) {
show_all = 1;
if (argc != 2)
usage();
} else if (strcmp(argv[i], "-d") == 0) {
int j;
for (j=0; j<=CAP_LAST_CAP; j++) {
const char *n =
capng_capability_to_name(j);
if (n == NULL)
n = "unknown";
printf("%s\n", n);
}
return 0;
} else if (argv[i][0] == '/') {
if (lstat(argv[i], &sbuf) != 0) {
fprintf(stderr,
"Error checking path %s (%s)\n",
argv[i], strerror(errno));
exit(1);
}
// Clear all capabilities in case cap strings
// follow. If we get a second file we err out
// so this is safe
if (S_ISREG(sbuf.st_mode) && path == NULL &&
dir == NULL) {
path = argv[i];
capng_clear(CAPNG_SELECT_BOTH);
} else if (S_ISDIR(sbuf.st_mode) && path == NULL
&& dir == NULL)
dir = argv[i];
else {
fprintf(stderr,
"Must be one regular file or "
"directory\n");
exit(1);
}
} else {
int cap = capng_name_to_capability(argv[i]);
if (cap >= 0) {
if (path == NULL)
usage();
capng_update(CAPNG_ADD,
CAPNG_PERMITTED|CAPNG_EFFECTIVE,
cap);
capabilities = 1;
} else if (strcmp("none", argv[i]) == 0) {
capng_clear(CAPNG_SELECT_BOTH);
capabilities = 1;
cremove = 1;
} else {
fprintf(stderr,
"Unrecognized capability.\n");
usage();
}
}
}
}
if (path == NULL && dir == NULL && show_all == 0) {
path_env = getenv("PATH");
if (path_env != NULL) {
path = strdup(path_env);
if (!path)
return 1;
for (dir=strtok(path,":"); dir!=NULL;
dir=strtok(NULL,":")) {
nftw(dir, check_file, 1024, nftw_flags);
}
free(path);
}
} else if (path == NULL && dir == NULL && show_all == 1) {
// Find files
nftw("/", check_file, 1024, nftw_flags);
} else if (dir) {
// Print out the dir
nftw(dir, check_file, 1024, nftw_flags);
}else if (path && capabilities == 0) {
// Print out specific file
single_file = 1;
rc = check_file(path, &sbuf, 0, NULL);
} else if (path && capabilities == 1) {
// Write capabilities to file
int fd = open(path, O_WRONLY|O_NOFOLLOW|O_CLOEXEC);
if (fd < 0) {
fprintf(stderr,
"Could not open %s for writing (%s)\n", path,
strerror(errno));
return 1;
}
if (capng_apply_caps_fd(fd) < 0) {
fprintf(stderr,
"Could not set capabilities on %s: %s\n",
path, strerror(errno));
rc = 1;
}
close(fd);
}
#endif
return rc;
}
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