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/*
* Copyright (C) 2014-2018 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"
/* static char *cmdlist[] = { */
/* "/usr/bin/firejail", */
/* "--quiet", */
/* "--output=" TRACE_OUTPUT, */
/* "--noprofile", */
/* "--caps.drop=all", */
/* "--nonewprivs", */
/* "--trace", */
/* "--shell=none", */
/* "/usr/bin/strace", // also used as a marker in build_profile() */
/* "-c", */
/* "-f", */
/* "-o" STRACE_OUTPUT, */
/* }; */
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";
char strace_output[] = "/tmp/firejail-strace.XXXXXX";
int tfile = mkstemp(trace_output);
int stfile = mkstemp(strace_output);
if(tfile == -1 || stfile == -1)
errExit("mkstemp");
// close the files, firejail/strace will overwrite them!
close(tfile);
close(stfile);
char *output;
char *stroutput;
if(asprintf(&output,"--output=%s",trace_output) == -1)
errExit("asprintf");
if(asprintf(&stroutput,"-o %s",strace_output) == -1)
errExit("asprintf");
char *cmdlist[] = {
"/usr/bin/firejail",
"--quiet",
output,
"--noprofile",
"--caps.drop=all",
"--nonewprivs",
"--trace",
"--shell=none",
"/usr/bin/strace", // also used as a marker in build_profile()
"-c",
"-f",
stroutput,
};
// detect strace
int have_strace = 0;
if (access("/usr/bin/strace", X_OK) == 0)
have_strace = 1;
// 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++) {
// skip strace if not installed
if (have_strace == 0 && strcmp(cmdlist[i], "/usr/bin/strace") == 0)
break;
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("\t%s\n", 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) {
printf("\n\n\n");
fprintf(fp, "############################################\n");
fprintf(fp, "# %s profile\n", argv[index]);
fprintf(fp, "############################################\n");
fprintf(fp, "# Persistent global definitions\n");
fprintf(fp, "# include /etc/firejail/globals.local\n");
fprintf(fp, "\n");
fprintf(fp, "### basic blacklisting\n");
fprintf(fp, "include /etc/firejail/disable-common.inc\n");
fprintf(fp, "# include /etc/firejail/disable-devel.inc\n");
fprintf(fp, "include /etc/firejail/disable-passwdmgr.inc\n");
fprintf(fp, "# include /etc/firejail/disable-programs.inc\n");
fprintf(fp, "\n");
fprintf(fp, "### home directory whitelisting\n");
build_home(trace_output, fp);
fprintf(fp, "\n");
fprintf(fp, "### filesystem\n");
build_tmp(trace_output, fp);
build_dev(trace_output, fp);
build_etc(trace_output, fp);
build_var(trace_output, fp);
build_bin(trace_output, fp);
build_share(trace_output, fp);
fprintf(fp, "\n");
fprintf(fp, "### security filters\n");
fprintf(fp, "caps.drop all\n");
fprintf(fp, "nonewprivs\n");
fprintf(fp, "seccomp\n");
if (have_strace)
build_seccomp(strace_output, fp);
else {
fprintf(fp, "# If you install strace on your system, Firejail will also create a\n");
fprintf(fp, "# whitelisted seccomp filter.\n");
}
fprintf(fp, "\n");
fprintf(fp, "### network\n");
build_protocol(trace_output, fp);
fprintf(fp, "\n");
fprintf(fp, "### environment\n");
fprintf(fp, "shell none\n");
unlink(trace_output);
unlink(strace_output);
}
else {
fprintf(stderr, "Error: cannot run the sandbox\n");
exit(1);
}
}
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