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/*
* Copyright (C) 2014-2023 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 "firecfg.h"
#include "../include/firejail_user.h"
int arg_debug = 0;
char *arg_bindir = "/usr/local/bin";
int arg_guide = 0;
static const char *const usage_str =
"Firecfg is the desktop configuration utility for Firejail software. The utility\n"
"creates several symbolic links to firejail executable. This allows the user to\n"
"sandbox applications automatically, just by clicking on a regular desktop\n"
"menus and icons.\n\n"
"The symbolic links are placed in /usr/local/bin. For more information, see\n"
"DESKTOP INTEGRATION section in man 1 firejail.\n\n"
"Usage: firecfg [OPTIONS]\n\n"
" --add-users user [user] - add the users to Firejail user access database.\n\n"
" --bindir=directory - install in directory instead of /usr/local/bin.\n\n"
" --clean - remove all firejail symbolic links.\n\n"
" --debug - print debug messages.\n\n"
" --fix - fix .desktop files.\n\n"
" --fix-sound - create ~/.config/pulse/client.conf file.\n\n"
" --guide - guided configuration for new users.\n\n"
" --help, -? - this help screen.\n\n"
" --list - list all firejail symbolic links.\n\n"
" --version - print program version and exit.\n\n"
"Example:\n\n"
" $ sudo firecfg\n"
" /usr/local/bin/firefox created\n"
" /usr/local/bin/vlc created\n"
" [...]\n"
" $ firecfg --list\n"
" /usr/local/bin/firefox\n"
" /usr/local/bin/vlc\n"
" [...]\n"
" $ sudo firecfg --clean\n"
" /usr/local/bin/firefox removed\n"
" /usr/local/bin/vlc removed\n"
" [...]\n"
"\n"
"License GPL version 2 or later\n"
"Homepage: https://firejail.wordpress.com\n";
static void print_version(void) {
printf("firecfg version %s\n\n", VERSION);
}
static void usage(void) {
print_version();
puts(usage_str);
}
static void list(void) {
DIR *dir = opendir(arg_bindir);
if (!dir) {
perror("opendir");
fprintf(stderr, "Error: cannot open %s directory\n", arg_bindir);
exit(1);
}
char *firejail_exec;
if (asprintf(&firejail_exec, "%s/bin/firejail", PREFIX) == -1)
errExit("asprintf");
struct dirent *entry;
while ((entry = readdir(dir)) != NULL) {
if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0)
continue;
char *fullname;
if (asprintf(&fullname, "%s/%s", arg_bindir, entry->d_name) == -1)
errExit("asprintf");
if (is_link(fullname)) {
char* fname = realpath(fullname, NULL);
if (fname) {
if (strcmp(fname, firejail_exec) == 0)
printf("%s\n", fullname);
free(fname);
}
}
free(fullname);
}
closedir(dir);
free(firejail_exec);
}
static void clean(void) {
printf("Removing all firejail symlinks:\n");
DIR *dir = opendir(arg_bindir);
if (!dir) {
perror("opendir");
fprintf(stderr, "Error: cannot open %s directory\n", arg_bindir);
exit(1);
}
char *firejail_exec;
if (asprintf(&firejail_exec, "%s/bin/firejail", PREFIX) == -1)
errExit("asprintf");
struct dirent *entry;
while ((entry = readdir(dir)) != NULL) {
if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0)
continue;
char *fullname;
if (asprintf(&fullname, "%s/%s", arg_bindir, entry->d_name) == -1)
errExit("asprintf");
if (is_link(fullname)) {
char* fname = realpath(fullname, NULL);
if (fname) {
if (strcmp(fname, firejail_exec) == 0) {
char *ptr = strrchr(fullname, '/');
assert(ptr);
ptr++;
int rv = unlink(fullname);
if (rv)
fprintf(stderr, "Warning: cannot remove %s\n", fullname);
else
printf(" %s removed\n", ptr);
}
free(fname);
}
}
free(fullname);
}
closedir(dir);
free(firejail_exec);
printf("\n");
}
static void set_file(const char *name, const char *firejail_exec) {
if (which(name) == 0)
return;
char *fname;
if (asprintf(&fname, "%s/%s", arg_bindir, name) == -1)
errExit("asprintf");
struct stat s;
if (stat(fname, &s) != 0) {
int rv = symlink(firejail_exec, fname);
if (rv) {
fprintf(stderr, "Error: cannot create %s symbolic link\n", fname);
perror("symlink");
} else {
printf(" %s created\n", name);
}
} else {
fprintf(stderr, "Warning: cannot create %s - already exists! Skipping...\n", fname);
}
free(fname);
}
// parse /etc/firejail/firecfg.config file
static void set_links_firecfg(void) {
char *cfgfile;
if (asprintf(&cfgfile, "%s/firecfg.config", SYSCONFDIR) == -1)
errExit("asprintf");
char *firejail_exec;
if (asprintf(&firejail_exec, "%s/bin/firejail", PREFIX) == -1)
errExit("asprintf");
// parse /etc/firejail/firecfg.config file
FILE *fp = fopen(cfgfile, "r");
if (!fp) {
perror("fopen");
fprintf(stderr, "Error: cannot open %s\n", cfgfile);
exit(1);
}
printf("Configuring symlinks in %s based on firecfg.config\n", arg_bindir);
char buf[MAX_BUF];
int lineno = 0;
while (fgets(buf, MAX_BUF,fp)) {
lineno++;
if (*buf == '#') // comments
continue;
// do not accept .. and/or / in file name
if (strstr(buf, "..") || strchr(buf, '/')) {
fprintf(stderr, "Error: invalid line %d in %s\n", lineno, cfgfile);
exit(1);
}
// remove \n
char *ptr = strchr(buf, '\n');
if (ptr)
*ptr = '\0';
// trim spaces
ptr = buf;
while (*ptr == ' ' || *ptr == '\t')
ptr++;
char *start = ptr;
// empty line
if (*start == '\0')
continue;
// set link
set_file(start, firejail_exec);
}
fclose(fp);
free(cfgfile);
free(firejail_exec);
}
// parse ~/.config/firejail/ directory
static void set_links_homedir(const char *homedir) {
assert(homedir);
// check firejail config directory
char *dirname;
if (asprintf(&dirname, "%s/.config/firejail", homedir) == -1)
errExit("asprintf");
struct stat s;
if (stat(dirname, &s) != 0) {
free(dirname);
return;
}
char *firejail_exec;
if (asprintf(&firejail_exec, "%s/bin/firejail", PREFIX) == -1)
errExit("asprintf");
// parse ~/.config/firejail/ directory
printf("\nConfiguring symlinks in %s based on local firejail config directory\n", arg_bindir);
DIR *dir = opendir(dirname);
if (!dir) {
perror("opendir");
fprintf(stderr, "Error: cannot open %s directory\n", dirname);
free(dirname);
return;
}
free(dirname);
struct dirent *entry;
while ((entry = readdir(dir))) {
if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0)
continue;
char *exec = strdup(entry->d_name);
if (!exec)
errExit("strdup");
char *ptr = strrchr(exec, '.');
if (!ptr) {
free(exec);
continue;
}
if (strcmp(ptr, ".profile") != 0) {
free(exec);
continue;
}
*ptr = '\0';
set_file(exec, firejail_exec);
free(exec);
}
closedir(dir);
free(firejail_exec);
}
static const char *get_sudo_user(void) {
const char *doas_user = getenv("DOAS_USER");
const char *sudo_user = getenv("SUDO_USER");
const char *user = doas_user ? doas_user : sudo_user;
if (!user) {
user = getpwuid(getuid())->pw_name;
if (!user) {
fprintf(stderr, "Error: cannot detect login user\n");
exit(1);
}
}
return user;
}
static const char *get_homedir(const char *user, uid_t *uid, gid_t *gid) {
// find home directory
struct passwd *pw = getpwnam(user);
if (!pw)
goto errexit;
const char *home = pw->pw_dir;
if (!home)
goto errexit;
*uid = pw->pw_uid;
*gid = pw->pw_gid;
return home;
errexit:
fprintf(stderr, "Error: cannot find home directory for user %s\n", user);
exit(1);
}
int main(int argc, char **argv) {
int i;
int bindir_set = 0;
// user setup
const char *user = get_sudo_user();
assert(user);
uid_t uid;
gid_t gid;
const char *home = get_homedir(user, &uid, &gid);
// check for --bindir
for (i = 1; i < argc; i++) {
if (strncmp(argv[i], "--bindir=", 9) == 0) {
if (strncmp(argv[i] + 9, "~/", 2) == 0) {
if (asprintf(&arg_bindir, "%s/%s", home, argv[i] + 11) == -1)
errExit("asprintf");
}
else
arg_bindir = argv[i] + 9;
bindir_set = 1;
// exit if the directory does not exist, or if we don't have access to it
if (access(arg_bindir, R_OK | W_OK | X_OK)) {
if (errno == EACCES)
fprintf(stderr, "Error: firecfg needs full permissions on directory %s\n", arg_bindir);
else {
perror("access");
fprintf(stderr, "Error: cannot access directory %s\n", arg_bindir);
}
exit(1);
}
}
}
for (i = 1; i < argc; i++) {
// default options
if (strcmp(argv[i], "--help") == 0 ||
strcmp(argv[i], "-?") == 0) {
usage();
return 0;
}
else if (strcmp(argv[i], "--debug") == 0)
arg_debug = 1;
else if (strcmp(argv[i], "--version") == 0) {
print_version();
return 0;
}
else if (strcmp(argv[i], "--clean") == 0) {
clean();
return 0;
}
else if (strcmp(argv[i], "--fix") == 0) {
fix_desktop_files(home);
return 0;
}
else if (strcmp(argv[i], "--guide") == 0) {
arg_guide = 1;
}
else if (strcmp(argv[i], "--list") == 0) {
list();
return 0;
}
else if (strcmp(argv[i], "--fix-sound") == 0) {
sound();
return 0;
}
else if (strcmp(argv[i], "--add-users") == 0) {
int j;
if (getuid() != 0) {
fprintf(stderr, "Error: you need to be root to use this option\n");
exit(1);
}
// set umask, access database must be world-readable
umask(022);
for (j = i + 1; j < argc; j++) {
printf("Adding user %s to Firejail access database in %s/firejail.users\n", argv[j], SYSCONFDIR);
firejail_user_add(argv[j]);
}
return 0;
}
else {
if (strncmp(argv[i], "--bindir=", 9) != 0) { // already handled
fprintf(stderr, "Error: invalid command line option\n");
usage();
return 1;
}
}
}
print_version();
if (arg_debug)
printf("%s %d %d %d %d\n", user, getuid(), getgid(), geteuid(), getegid());
// set symlinks in /usr/local/bin
if (bindir_set == 0 && getuid() != 0) {
fprintf(stderr, "Error: cannot set the symbolic links in %s\n", arg_bindir);
fprintf(stderr, "The proper way to run this command is \"sudo firecfg\".\n");
return 1;
}
else if (bindir_set == 0) {
// create /usr/local directory if it doesn't exist (Solus distro)
mode_t orig_umask = umask(022); // temporarily set the umask
struct stat s;
if (stat("/usr/local", &s) != 0) {
printf("Creating /usr/local directory\n");
int rv = mkdir("/usr/local", 0755);
if (rv != 0) {
fprintf(stderr, "Error: cannot create /usr/local directory\n");
return 1;
}
}
if (stat(arg_bindir, &s) != 0) {
printf("Creating %s directory\n", arg_bindir);
int rv = mkdir(arg_bindir, 0755);
if (rv != 0) {
fprintf(stderr, "Error: cannot create %s directory\n", arg_bindir);
return 1;
}
}
umask(orig_umask);
}
if (arg_guide) {
char *cmd;
if (arg_debug) {
if (asprintf(&cmd, "sudo %s/firejail/firejail-welcome.sh /usr/lib/firejail/fzenity %s %s", LIBDIR, SYSCONFDIR, user) == -1)
errExit("asprintf");
}
else {
if (asprintf(&cmd, "sudo %s/firejail/firejail-welcome.sh /usr/bin/zenity %s %s", LIBDIR, SYSCONFDIR, user) == -1)
errExit("asprintf");
}
int status = system(cmd);
if (status == -1) {
fprintf(stderr, "Error: cannot run firejail-welcome.sh\n");
exit(1);
}
free(cmd);
// the last 8 bits of the status is the return value of the command executed by system()
// firejail-welcome.sh returns 55 if setting sysmlinks is required
if (WEXITSTATUS(status) != 55)
return 0;
}
// clear all symlinks
clean();
// set new symlinks based on /etc/firejail/firecfg.config
set_links_firecfg();
if (getuid() == 0) {
// add user to firejail access database - only for root
printf("\nAdding user %s to Firejail access database in %s/firejail.users\n", user, SYSCONFDIR);
// temporarily set the umask, access database must be world-readable
mode_t orig_umask = umask(022);
firejail_user_add(user);
umask(orig_umask);
#ifdef HAVE_APPARMOR
// enable firejail apparmor profile
struct stat s;
if (stat("/sbin/apparmor_parser", &s) == 0) {
char *cmd;
// SYSCONFDIR points to /etc/firejail, we have to go on level up (..)
printf("\nLoading AppArmor profile\n");
if (asprintf(&cmd, "/sbin/apparmor_parser -r /etc/apparmor.d/firejail-default %s/../apparmor.d/firejail-default", SYSCONFDIR) == -1)
errExit("asprintf");
int rv = system(cmd);
(void) rv;
free(cmd);
}
#endif
}
// set new symlinks based on ~/.config/firejail directory
set_links_homedir(home);
// drop permissions
if (getuid() == 0) {
if (setgroups(0, NULL) < 0)
errExit("setgroups");
if (setgid(gid) < 0)
errExit("setgid");
if (setuid(uid) < 0)
errExit("setuid");
}
if (arg_debug)
printf("%s %d %d %d %d\n", user, getuid(), getgid(), geteuid(), getegid());
// if runs as regular user, fix .desktop files in ~/.local/share/applications directory
if (getuid() != 0)
fix_desktop_files(home);
return 0;
}
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