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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 "fbuilder.h"
#include <sys/wait.h>
#define TRACE_OUTPUT "/tmp/firejail-trace.XXXXXX"
#define STRACE_OUTPUT "/tmp/firejail-strace.XXXXXX"
void build_profile(int argc, char **argv, int index, FILE *fp) {
// next index is the application name
if (index >= argc) {
fprintf(stderr, "Error: application name missing\n");
exit(1);
}
char trace_output[] = "/tmp/firejail-trace.XXXXXX";
int tfile = mkstemp(trace_output);
if(tfile == -1)
errExit("mkstemp");
close(tfile);
char *output;
if(asprintf(&output,"--trace=%s",trace_output) == -1)
errExit("asprintf");
char *cmdlist[] = {
BINDIR "/firejail",
"--quiet",
"--noprofile",
"--caps.drop=all",
"--seccomp",
output,
"--shell=none",
};
// calculate command length
unsigned len = (int) sizeof(cmdlist) / sizeof(char*) + argc - index + 1;
if (arg_debug)
printf("command len %d + %d + 1\n", (int) (sizeof(cmdlist) / sizeof(char*)), argc - index);
char *cmd[len];
cmd[0] = cmdlist[0]; // explicit assignment to clean scan-build error
// build command
unsigned i = 0;
for (i = 0; i < (int) sizeof(cmdlist) / sizeof(char*); i++)
cmd[i] = cmdlist[i];
int i2 = index;
for (; i < (len - 1); i++, i2++)
cmd[i] = argv[i2];
assert(i < len);
cmd[i] = NULL;
if (arg_debug) {
for (i = 0; i < len; i++)
printf("%s%s\n", (i)?"\t":"", cmd[i]);
}
// fork and execute
pid_t child = fork();
if (child == -1)
errExit("fork");
if (child == 0) {
assert(cmd[0]);
int rv = execvp(cmd[0], cmd);
(void) rv;
errExit("execv");
}
// wait for all processes to finish
int status;
if (waitpid(child, &status, 0) != child)
errExit("waitpid");
if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
if (fp == stdout)
printf("--- Built profile beings after this line ---\n");
fprintf(fp, "# Save this file as \"application.profile\" (change \"application\" with the\n");
fprintf(fp, "# program name) in ~/.config/firejail directory. Firejail will find it\n");
fprintf(fp, "# automatically every time you sandbox your application.\n#\n");
fprintf(fp, "# Run \"firejail application\" to test it. In the file there are\n");
fprintf(fp, "# some other commands you can try. Enable them by removing the \"#\".\n\n");
fprintf(fp, "# Firejail profile for %s\n", argv[index]);
fprintf(fp, "# Persistent local customizations\n");
fprintf(fp, "#include %s.local\n", argv[index]);
fprintf(fp, "# Persistent global definitions\n");
fprintf(fp, "#include globals.local\n");
fprintf(fp, "\n");
fprintf(fp, "### Basic Blacklisting ###\n");
fprintf(fp, "### Enable as many of them as you can! A very important one is\n");
fprintf(fp, "### \"disable-exec.inc\". This will make among other things your home\n");
fprintf(fp, "### and /tmp directories non-executable.\n");
fprintf(fp, "include disable-common.inc\t# dangerous directories like ~/.ssh and ~/.gnupg\n");
fprintf(fp, "#include disable-devel.inc\t# development tools such as gcc and gdb\n");
fprintf(fp, "#include disable-exec.inc\t# non-executable directories such as /var, /tmp, and /home\n");
fprintf(fp, "#include disable-interpreters.inc\t# perl, python, lua etc.\n");
fprintf(fp, "include disable-programs.inc\t# user configuration for programs such as firefox, vlc etc.\n");
fprintf(fp, "#include disable-shell.inc\t# sh, bash, zsh etc.\n");
fprintf(fp, "#include disable-xdg.inc\t# standard user directories: Documents, Pictures, Videos, Music\n");
fprintf(fp, "\n");
fprintf(fp, "### Home Directory Whitelisting ###\n");
fprintf(fp, "### If something goes wrong, this section is the first one to comment out.\n");
fprintf(fp, "### Instead, you'll have to relay on the basic blacklisting above.\n");
build_home(trace_output, fp);
fprintf(fp, "\n");
fprintf(fp, "### Filesystem Whitelisting ###\n");
build_share(trace_output, fp);
//todo: include whitelist-runuser-common.inc
build_var(trace_output, fp);
fprintf(fp, "\n");
fprintf(fp, "#apparmor\t# if you have AppArmor running, try this one!\n");
fprintf(fp, "caps.drop all\n");
fprintf(fp, "ipc-namespace\n");
fprintf(fp, "netfilter\n");
fprintf(fp, "#no3d\t# disable 3D acceleration\n");
fprintf(fp, "#nodvd\t# disable DVD and CD devices\n");
fprintf(fp, "#nogroups\t# disable supplementary user groups\n");
fprintf(fp, "#noinput\t# disable input devices\n");
fprintf(fp, "nonewprivs\n");
fprintf(fp, "noroot\n");
fprintf(fp, "#notv\t# disable DVB TV devices\n");
fprintf(fp, "#nou2f\t# disable U2F devices\n");
fprintf(fp, "#novideo\t# disable video capture devices\n");
build_protocol(trace_output, fp);
fprintf(fp, "seccomp\n");
fprintf(fp, "shell none\n");
fprintf(fp, "tracelog\n");
fprintf(fp, "\n");
fprintf(fp, "#disable-mnt\t# no access to /mnt, /media, /run/mount and /run/media\n");
build_bin(trace_output, fp);
fprintf(fp, "#private-cache\t# run with an empty ~/.cache directory\n");
build_dev(trace_output, fp);
build_etc(trace_output, fp);
fprintf(fp, "#private-lib\n");
build_tmp(trace_output, fp);
fprintf(fp, "\n");
fprintf(fp, "#dbus-user none\n");
fprintf(fp, "#dbus-system none\n");
fprintf(fp, "\n");
fprintf(fp, "#memory-deny-write-execute\n");
if (!arg_debug)
unlink(trace_output);
}
else {
fprintf(stderr, "Error: cannot run the sandbox\n");
exit(1);
}
}
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