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/*
* Copyright (C) 2014-2021 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 <dirent.h>
#include <sys/stat.h>
extern void fslib_mount_libs(const char *full_path, unsigned user);
extern void fslib_mount(const char *full_path);
//***************************************************************
// Standard C library
//***************************************************************
// standard libc libraries based on Debian's libc6 package
// selinux seems to be linked in most command line utilities
// libpcre2 is a dependency of selinux
// locale (/usr/lib/locale) - without it, the program will default to "C" locale
typedef struct liblist_t {
const char *name;
int len;
} LibList;
static LibList libc_list[] = {
{ "libselinux.so.", 0 },
{ "libpcre2-8.so.", 0 },
{ "libapparmor.so.", 0},
{ "ld-linux-x86-64.so.", 0 },
{ "libanl.so.", 0 },
{ "libc.so.", 0 },
{ "libcidn.so.", 0 },
{ "libcrypt.so.", 0 },
{ "libdl.so.", 0 },
{ "libm.so.", 0 },
{ "libmemusage.so", 0 },
{ "libmvec.so.", 0 },
{ "libnsl.so.", 0 },
{ "libnss_compat.so.", 0 },
{ "libnss_dns.so.", 0 },
{ "libnss_files.so.", 0 },
{ "libnss_hesiod.so.", 0 },
{ "libnss_nisplus.so.", 0 },
{ "libnss_nis.so.", 0 },
{ "libpthread.so.", 0 },
{ "libresolv.so.", 0 },
{ "librt.so.", 0 },
{ "libthread_db.so.", 0 },
{ "libutil.so.", 0 },
{ NULL, 0}
};
static int find_libc_list(const char *name) {
assert(name);
int i = 0;
while (libc_list[i].name) {
if (libc_list[i].len == 0)
libc_list[i].len = strlen(libc_list[i].name);
if (strncmp(name, libc_list[i].name, libc_list[i].len) == 0)
return 1;
i++;
}
return 0;
}
// compare the files in dirname against liblist above
static void stdc(const char *dirname) {
assert(dirname);
DIR *dir = opendir(dirname);
if (dir) {
struct dirent *entry;
while ((entry = readdir(dir)) != NULL) {
if (strcmp(entry->d_name, ".") == 0)
continue;
if (strcmp(entry->d_name, "..") == 0)
continue;
if (find_libc_list(entry->d_name)) {
char *fname;
if (asprintf(&fname, "%s/%s", dirname, entry->d_name) == -1)
errExit("asprintf");
fslib_mount(fname);
free(fname);
}
}
closedir(dir);
}
}
void fslib_install_stdc(void) {
// install standard C libraries
timetrace_start();
struct stat s;
if (stat("/lib/x86_64-linux-gnu", &s) == 0) { // Debian & friends
mkdir_attr(RUN_LIB_DIR "/x86_64-linux-gnu", 0755, 0, 0);
selinux_relabel_path(RUN_LIB_DIR "/x86_64-linux-gnu", "/lib/x86_64-linux-gnu");
stdc("/lib/x86_64-linux-gnu");
}
stdc("/lib64"); // CentOS, Fedora, Arch, ld-linux.so in Debian & friends
// install locale
if (stat("/usr/lib/locale", &s) == 0)
fslib_mount("/usr/lib/locale");
fmessage("Standard C library installed in %0.2f ms\n", timetrace_end());
}
//***************************************************************
// Firejail libraries
//***************************************************************
static void fdir(void) {
// firejail directory itself
fslib_mount(LIBDIR "/firejail");
// executables and libraries from firejail directory
static const char * const fbin[] = {
PATH_FCOPY, // currently sufficient to find all needed libraries
// PATH_FSECCOMP,
// PATH_FSEC_OPTIMIZE,
// PATH_FSEC_PRINT,
// RUN_FIREJAIL_LIB_DIR "/libtrace.so",
// RUN_FIREJAIL_LIB_DIR "/libtracelog.so",
// RUN_FIREJAIL_LIB_DIR "/libpostexecseccomp.so",
NULL,
};
// need to parse as root user, unprivileged users have no read permission on executables
int i;
for (i = 0; fbin[i]; i++)
fslib_mount_libs(fbin[i], 0);
}
void fslib_install_firejail(void) {
timetrace_start();
// bring in firejail executable libraries, in case we are redirected here
// by a firejail symlink from /usr/local/bin/firejail
fslib_mount_libs(PATH_FIREJAIL, 1); // parse as user
// bring in firejail directory
fdir();
// bring in dhclient libraries
if (any_dhcp())
fslib_mount_libs(RUN_MNT_DIR "/dhclient", 1); // parse as user
// bring in xauth libraries
if (arg_x11_xorg)
fslib_mount_libs("/usr/bin/xauth", 1); // parse as user
fmessage("Firejail libraries installed in %0.2f ms\n", timetrace_end());
}
//***************************************************************
// various system libraries
//***************************************************************
// look for library in the new filesystem, and install one or two more directories, dir1 and dir2
typedef struct syslib_t {
const char *library; // look in the system for this library
int len; // length of library string, 0 by default
int found; // library found, 0 by default
const char *dir1; // directory to install
const char *dir2; // directory to install
const char *message; // message to print on the screen
} SysLib;
SysLib syslibs[] = {
#if 0
{
"", // library
0, 0, // len and found flag
"", // dir1
"", // dir2
"" // message
},
#endif
{ // pixmaps - libraries used by GTK to display application menu icons
"libgdk_pixbuf-2.0", // library
0, 0, // len and found flag
"gdk-pixbuf-2.0", // dir1
"", // dir2
"GdkPixbuf" // message
},
{ // GTK2
"libgtk-x11-2.0", // library
0, 0, // len and found flag
"gtk-2.0", // dir1
"libgtk2.0-0", // dir2
"GTK2" // message
},
{ // GTK3
"libgtk-3", // library
0, 0, // len and found flag
"gtk-3.0", // dir1
"libgtk-3-0", // dir2
"GTK3" // message
},
{ // Pango - text internationalization, found on older GTK2-based systems
"libpango", // library
0, 0, // len and found flag
"pango", // dir1
"", // dir2
"Pango" // message
},
{ // Library for handling GObject introspection data on GTK systems
"libgirepository-1.0", // library
0, 0, // len and found flag
"girepository-1.0", // dir1
"", // dir2
"GIRepository" // message
},
{ // GIO
"libgio", // library
0, 0, // len and found flag
"gio", // dir1
"", // dir2
"GIO" // message
},
{ // Enchant speller
"libenchant.so.", // library
0, 0, // len and found flag
"enchant", // dir1
"", // dir2
"Enchant (speller)" // message
},
{ // Qt5 - lots of problems on Arch Linux, Qt5 version 5.9.1 - disabled in all apps profiles
"libQt5", // library
0, 0, // len and found flag
"qt5", // dir1
"gdk-pixbuf-2.0", // dir2
"Qt5, GdkPixbuf" // message
},
{ // Qt4
"libQtCore", // library
0, 0, // len and found flag
"qt4", // dir1
"gdk-pixbuf-2.0", // dir2
"Qt4" // message
},
{ // NULL terminated list
NULL, // library
0, 0, // len and found flag
"", // dir1
"", // dir2
"" // message
}
};
void fslib_install_system(void) {
// look for installed libraries
DIR *dir = opendir(RUN_LIB_DIR "/x86_64-linux-gnu");
if (!dir)
dir = opendir(RUN_LIB_DIR);
if (dir) {
struct dirent *entry;
while ((entry = readdir(dir)) != NULL) {
if (strcmp(entry->d_name, ".") == 0)
continue;
if (strcmp(entry->d_name, "..") == 0)
continue;
SysLib *ptr = &syslibs[0];
while (ptr->library) {
if (ptr->len == 0)
ptr->len = strlen(ptr->library);
if (strncmp(entry->d_name, ptr->library, ptr->len) == 0) {
ptr->found = 1;
break;
}
ptr++;
}
}
closedir(dir);
}
else
assert(0);
// install required directories
SysLib *ptr = &syslibs[0];
while (ptr->library) {
if (ptr->found) {
assert(*ptr->message != '\0');
timetrace_start();
// bring in all libraries
assert(ptr->dir1);
char *name;
// Debian & friends
if (asprintf(&name, "/usr/lib/x86_64-linux-gnu/%s", ptr->dir1) == -1)
errExit("asprintf");
if (access(name, R_OK) == 0) {
fslib_mount_libs(name, 1); // parse as user
fslib_mount(name);
}
else {
free(name);
// CentOS, Fedora, Arch
if (asprintf(&name, "/usr/lib64/%s", ptr->dir1) == -1)
errExit("asprintf");
if (access(name, R_OK) == 0) {
fslib_mount_libs(name, 1); // parse as user
fslib_mount(name);
}
}
free(name);
if (*ptr->dir2 != '\0') {
// Debian & friends
if (asprintf(&name, "/usr/lib/x86_64-linux-gnu/%s", ptr->dir2) == -1)
errExit("asprintf");
if (access(name, R_OK) == 0) {
fslib_mount_libs(name, 1); // parse as user
fslib_mount(name);
}
else {
free(name);
// CentOS, Fedora, Arch
if (asprintf(&name, "/usr/lib64/%s", ptr->dir2) == -1)
errExit("asprintf");
if (access(name, R_OK) == 0) {
fslib_mount_libs(name, 1); // parse as user
fslib_mount(name);
}
}
free(name);
}
fmessage("%s installed in %0.2f ms\n", ptr->message, timetrace_end());
}
ptr++;
}
}
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