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/*
* Copyright (C) 2014-2016 Firejail Authors
*
* This file is part of firejail project
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, 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; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "firejail.h"
#include <sys/stat.h>
#define MAX_READ 8192 // line buffer for profile files
static int initialized = 0;
static int cfg_val[CFG_MAX];
char *xephyr_screen = "800x600";
int checkcfg(int val) {
EUID_ASSERT();
assert(val < CFG_MAX);
int line = 0;
if (!initialized) {
// initialize defaults
int i;
for (i = 0; i < CFG_MAX; i++)
cfg_val[i] = 1; // most of them are enabled by default
cfg_val[CFG_RESTRICTED_NETWORK] = 0; // disabled by default
cfg_val[CFG_FORCE_NONEWPRIVS ] = 0; // disabled by default
// open configuration file
char *fname;
if (asprintf(&fname, "%s/firejail.config", SYSCONFDIR) == -1)
errExit("asprintf");
FILE *fp = fopen(fname, "r");
if (!fp) {
fprintf(stderr, "Error: Firejail configuration file %s not found\n", fname);
exit(1);
}
// read configuration file
char buf[MAX_READ];
while (fgets(buf,MAX_READ, fp)) {
line++;
if (*buf == '#' || *buf == '\n')
continue;
// parse line
char *ptr = line_remove_spaces(buf);
if (!ptr)
continue;
// file transfer
if (strncmp(ptr, "file-transfer ", 14) == 0) {
if (strcmp(ptr + 14, "yes") == 0)
cfg_val[CFG_FILE_TRANSFER] = 1;
else if (strcmp(ptr + 14, "no") == 0)
cfg_val[CFG_FILE_TRANSFER] = 0;
else
goto errout;
}
// x11
else if (strncmp(ptr, "x11 ", 4) == 0) {
if (strcmp(ptr + 4, "yes") == 0)
cfg_val[CFG_X11] = 1;
else if (strcmp(ptr + 4, "no") == 0)
cfg_val[CFG_X11] = 0;
else
goto errout;
}
// bind
else if (strncmp(ptr, "bind ", 5) == 0) {
if (strcmp(ptr + 5, "yes") == 0)
cfg_val[CFG_BIND] = 1;
else if (strcmp(ptr + 5, "no") == 0)
cfg_val[CFG_BIND] = 0;
else
goto errout;
}
// user namespace
else if (strncmp(ptr, "userns ", 7) == 0) {
if (strcmp(ptr + 7, "yes") == 0)
cfg_val[CFG_USERNS] = 1;
else if (strcmp(ptr + 7, "no") == 0)
cfg_val[CFG_USERNS] = 0;
else
goto errout;
}
// chroot
else if (strncmp(ptr, "chroot ", 7) == 0) {
if (strcmp(ptr + 7, "yes") == 0)
cfg_val[CFG_CHROOT] = 1;
else if (strcmp(ptr + 7, "no") == 0)
cfg_val[CFG_CHROOT] = 0;
else
goto errout;
}
// nonewprivs
else if (strncmp(ptr, "force-nonewprivs ", 17) == 0) {
if (strcmp(ptr + 17, "yes") == 0)
cfg_val[CFG_SECCOMP] = 1;
else if (strcmp(ptr + 17, "no") == 0)
cfg_val[CFG_SECCOMP] = 0;
else
goto errout;
}
// seccomp
else if (strncmp(ptr, "seccomp ", 8) == 0) {
if (strcmp(ptr + 8, "yes") == 0)
cfg_val[CFG_SECCOMP] = 1;
else if (strcmp(ptr + 8, "no") == 0)
cfg_val[CFG_SECCOMP] = 0;
else
goto errout;
}
// network
else if (strncmp(ptr, "network ", 8) == 0) {
if (strcmp(ptr + 8, "yes") == 0)
cfg_val[CFG_NETWORK] = 1;
else if (strcmp(ptr + 8, "no") == 0)
cfg_val[CFG_NETWORK] = 0;
else
goto errout;
}
// network
else if (strncmp(ptr, "restricted-network ", 19) == 0) {
if (strcmp(ptr + 19, "yes") == 0)
cfg_val[CFG_RESTRICTED_NETWORK] = 1;
else if (strcmp(ptr + 19, "no") == 0)
cfg_val[CFG_RESTRICTED_NETWORK] = 0;
else
goto errout;
}
// Xephyr screen size
else if (strncmp(ptr, "xephyr-screen ", 14) == 0) {
// expecting two numbers and an x between them
int n1;
int n2;
int rv = sscanf(ptr + 14, "%dx%d", &n1, &n2);
if (rv != 2)
goto errout;
if (asprintf(&xephyr_screen, "%dx%d", n1, n2) == -1)
errExit("asprintf");
}
else
goto errout;
free(ptr);
}
fclose(fp);
free(fname);
initialized = 1;
}
return cfg_val[val];
errout:
fprintf(stderr, "Error: invalid line %d in firejail configuration file\n", line );
exit(1);
}
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