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/*
* filecap.c - A program that lists running processes with capabilities
* Copyright (c) 2009-10 Red Hat Inc., Durham, North Carolina.
* 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., 675 Mass Ave, Cambridge, MA 02139, 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"
#define __USE_GNU 1
#include <fcntl.h>
#define __USE_XOPEN_EXTENDED 1
#include <ftw.h>
static int show_all = 0, header = 0, capabilities = 0, cremove = 0;
static void usage(void)
{
fprintf(stderr,
"usage: filecap [-a | -d | /dir | /dir/file [cap1 cap2 ...] ]\n");
exit(1);
}
static int check_file(const char *fpath,
const struct stat *sb,
int typeflag_unused __attribute__ ((unused)),
struct FTW *s_unused __attribute__ ((unused)))
{
if (S_ISREG(sb->st_mode) == 0)
return FTW_CONTINUE;
int fd = open(fpath, O_RDONLY);
if (fd >= 0) {
capng_results_t rc;
capng_clear(CAPNG_SELECT_BOTH);
capng_get_caps_fd(fd);
rc = capng_have_capabilities(CAPNG_SELECT_CAPS);
if (rc > CAPNG_NONE) {
if (header == 0) {
header = 1;
printf("%-20s capabilities\n", "file");
}
printf("%s ", fpath);
if (rc == CAPNG_FULL)
printf("full");
else
capng_print_caps_text(CAPNG_PRINT_STDOUT,
CAPNG_PERMITTED);
printf("\n");
}
close(fd);
}
return FTW_CONTINUE;
}
// 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)
printf("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;
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) {
for (i=0; i<=CAP_LAST_CAP; i++) {
printf("%s\n",
capng_capability_to_name(i));
}
return 0;
} else if (argv[i][0] == '/') {
if (lstat(argv[i], &sbuf) != 0) {
printf("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 {
printf("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 {
printf("Unrecognized capability.\n");
usage();
}
}
}
}
if (path == NULL && dir == NULL && show_all == 0) {
path_env = getenv("PATH");
if (path_env != NULL) {
path = strdup(path_env);
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
check_file(path, &sbuf, 0, NULL);
} else if (path && capabilities == 1) {
// Write capabilities to file
int fd = open(path, O_WRONLY|O_NOFOLLOW);
if (fd < 0) {
printf("Could not open %s for writing (%s)\n", path,
strerror(errno));
return 1;
}
capng_apply_caps_fd(fd);
close(fd);
}
#endif
return 0;
}
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