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/*
* Copyright (C) 2014 Tresys Technology, LLC
*
* 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 <errno.h>
#include <getopt.h>
#include <libgen.h>
#include <signal.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sepol/module.h>
#include <sepol/module_to_cil.h>
#include <sepol/policydb/module.h>
char *progname;
__attribute__ ((format(printf, 1, 2)))
static void log_err(const char *fmt, ...)
{
va_list argptr;
va_start(argptr, fmt);
if (vfprintf(stderr, fmt, argptr) < 0) {
_exit(EXIT_FAILURE);
}
va_end(argptr);
if (fprintf(stderr, "\n") < 0) {
_exit(EXIT_FAILURE);
}
}
static __attribute__((__noreturn__)) void usage(int err)
{
fprintf(stderr, "Usage: %s [OPTIONS] [IN_FILE [OUT_FILE]]\n", progname);
fprintf(stderr, "\n");
fprintf(stderr, "Read an SELinux policy package (.pp) and output the equivilent CIL.\n");
fprintf(stderr, "If IN_FILE is not provided or is -, read SELinux policy package from\n");
fprintf(stderr, "standard input. If OUT_FILE is not provided or is -, output CIL to\n");
fprintf(stderr, "standard output.\n");
fprintf(stderr, "\n");
fprintf(stderr, "Options:\n");
fprintf(stderr, " -h, --help print this message and exit\n");
exit(err);
}
int main(int argc, char **argv)
{
int rc = -1;
int opt;
static struct option long_opts[] = {
{ "help", 0, NULL, 'h' },
{ NULL, 0, NULL, 0 }
};
struct sepol_module_package *mod_pkg = NULL;
const char *ifile = NULL;
const char *ofile = NULL;
FILE *in = NULL;
FILE *out = NULL;
int outfd = -1;
// ignore sigpipe so we can check the return code of write, and potentially
// return a more helpful error message
signal(SIGPIPE, SIG_IGN);
progname = basename(argv[0]);
while ((opt = getopt_long(argc, argv, "h", long_opts, NULL)) != -1) {
switch (opt) {
case 'h':
usage(0);
case '?':
default:
usage(1);
}
}
if (argc >= optind + 1 && strcmp(argv[1], "-") != 0) {
ifile = argv[1];
in = fopen(ifile, "rb");
if (in == NULL) {
log_err("Failed to open %s: %s", ifile, strerror(errno));
rc = -1;
goto exit;
}
} else {
ifile = "stdin";
in = stdin;
}
if (argc >= optind + 2 && strcmp(argv[2], "-") != 0) {
ofile = argv[2];
out = fopen(ofile, "w");
if (out == NULL) {
log_err("Failed to open %s: %s", ofile, strerror(errno));
rc = -1;
goto exit;
}
} else {
out = stdout;
}
if (argc >= optind + 3) {
log_err("Too many arguments");
usage(1);
}
rc = sepol_ppfile_to_module_package(in, &mod_pkg);
if (rc != 0) {
goto exit;
}
fclose(in);
in = NULL;
if (ofile) {
char *mod_name = mod_pkg->policy->p.name;
char *cil_path = strdup(ofile);
if (cil_path == NULL) {
log_err("No memory available for strdup\n");
rc = -1;
goto exit;
}
char *cil_name = basename(cil_path);
char *separator = strrchr(cil_name, '.');
if (separator) {
*separator = '\0';
}
if (mod_name && strcmp(mod_name, cil_name) != 0) {
fprintf(stderr, "Warning: SELinux userspace will refer to the module from %s as %s rather than %s\n", ifile, mod_name, cil_name);
}
free(cil_path);
}
rc = sepol_module_package_to_cil(out, mod_pkg);
if (rc != 0) {
goto exit;
}
exit:
if (in != NULL) {
fclose(in);
}
if (out != NULL) {
fclose(out);
}
if (outfd != -1) {
close(outfd);
if (rc != 0) {
unlink(argv[2]);
}
}
sepol_module_package_free(mod_pkg);
return rc;
}
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