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selinux/secilc/secilc.c

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/*
* Copyright 2011 Tresys Technology, LLC. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY TRESYS TECHNOLOGY, LLC ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL TRESYS TECHNOLOGY, LLC OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those
* of the authors and should not be interpreted as representing official policies,
* either expressed or implied, of Tresys Technology, LLC.
*/
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <getopt.h>
#include <sys/stat.h>
#ifdef ANDROID
#include <cil/cil.h>
#else
#include <sepol/cil/cil.h>
#endif
#include <sepol/policydb.h>
static __attribute__((__noreturn__)) void usage(const char *prog)
{
printf("Usage: %s [OPTION]... FILE...\n", prog);
printf("\n");
printf("Options:\n");
printf(" -o, --output=<file> write binary policy to <file>\n");
printf(" (default: policy.<version>)\n");
printf(" -f, --filecontext=<file> write file contexts to <file>\n");
printf(" (default: file_contexts)\n");
printf(" -t, --target=<type> specify target architecture. may be selinux or\n");
printf(" xen. (default: selinux)\n");
printf(" -M, --mls true|false build an mls policy. Must be true or false.\n");
printf(" This will override the (mls boolean) statement\n");
printf(" if present in the policy\n");
printf(" -c, --policyvers=<version> build a binary policy with a given <version>\n");
printf(" (default: %i)\n", POLICYDB_VERSION_MAX);
printf(" -U, --handle-unknown=<action> how to handle unknown classes or permissions.\n");
printf(" may be deny, allow, or reject. (default: deny)\n");
printf(" This will override the (handleunknown action)\n");
printf(" statement if present in the policy\n");
printf(" -D, --disable-dontaudit do not add dontaudit rules to the binary policy\n");
printf(" -P, --preserve-tunables treat tunables as booleans\n");
printf(" -N, --disable-neverallow do not check neverallow rules\n");
printf(" -G, --expand-generated Expand and remove auto-generated attributes\n");
printf(" -X, --expand-size <SIZE> Expand type attributes with fewer than <SIZE>\n");
printf(" members.\n");
printf(" -v, --verbose increment verbosity level\n");
printf(" -h, --help display usage information\n");
exit(1);
}
int main(int argc, char *argv[])
{
int rc = SEPOL_ERR;
sepol_policydb_t *pdb = NULL;
struct sepol_policy_file *pf = NULL;
FILE *binary = NULL;
FILE *file_contexts;
FILE *file = NULL;
char *buffer = NULL;
struct stat filedata;
uint32_t file_size;
char *output = NULL;
char *filecontexts = NULL;
struct cil_db *db = NULL;
int target = SEPOL_TARGET_SELINUX;
int mls = -1;
int disable_dontaudit = 0;
int disable_neverallow = 0;
int preserve_tunables = 0;
int handle_unknown = -1;
int policyvers = POLICYDB_VERSION_MAX;
int attrs_expand_generated = 0;
int attrs_expand_size = -1;
int opt_char;
int opt_index = 0;
char *fc_buf = NULL;
size_t fc_size;
enum cil_log_level log_level = CIL_ERR;
static struct option long_opts[] = {
{"help", no_argument, 0, 'h'},
{"verbose", no_argument, 0, 'v'},
{"target", required_argument, 0, 't'},
{"mls", required_argument, 0, 'M'},
{"policyversion", required_argument, 0, 'c'},
{"handle-unknown", required_argument, 0, 'U'},
{"disable-dontaudit", no_argument, 0, 'D'},
{"disable-neverallow", no_argument, 0, 'N'},
{"preserve-tunables", no_argument, 0, 'P'},
{"output", required_argument, 0, 'o'},
{"filecontexts", required_argument, 0, 'f'},
{"expand-generated", no_argument, 0, 'G'},
{"expand-size", required_argument, 0, 'X'},
{0, 0, 0, 0}
};
int i;
while (1) {
opt_char = getopt_long(argc, argv, "o:f:U:hvt:M:PDNc:GX:", long_opts, &opt_index);
if (opt_char == -1) {
break;
}
switch (opt_char) {
case 'v':
log_level++;
break;
case 't':
if (!strcmp(optarg, "selinux")) {
target = SEPOL_TARGET_SELINUX;
} else if (!strcmp(optarg, "xen")) {
target = SEPOL_TARGET_XEN;
} else {
fprintf(stderr, "Unknown target: %s\n", optarg);
usage(argv[0]);
}
break;
case 'M':
if (!strcasecmp(optarg, "true") || !strcasecmp(optarg, "1")) {
mls = 1;
} else if (!strcasecmp(optarg, "false") || !strcasecmp(optarg, "0")) {
mls = 0;
} else {
usage(argv[0]);
}
break;
case 'c': {
char *endptr = NULL;
errno = 0;
policyvers = strtol(optarg, &endptr, 10);
if (errno != 0 || endptr == optarg || *endptr != '\0') {
fprintf(stderr, "Bad policy version: %s\n", optarg);
usage(argv[0]);
}
if (policyvers > POLICYDB_VERSION_MAX || policyvers < POLICYDB_VERSION_MIN) {
fprintf(stderr, "Policy version must be between %d and %d\n",
POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
usage(argv[0]);
}
break;
}
case 'U':
if (!strcasecmp(optarg, "deny")) {
handle_unknown = SEPOL_DENY_UNKNOWN;
} else if (!strcasecmp(optarg, "allow")) {
handle_unknown = SEPOL_ALLOW_UNKNOWN;
} else if (!strcasecmp(optarg, "reject")) {
handle_unknown = SEPOL_REJECT_UNKNOWN;
} else {
usage(argv[0]);
}
break;
case 'D':
disable_dontaudit = 1;
break;
case 'N':
disable_neverallow = 1;
break;
case 'P':
preserve_tunables = 1;
break;
case 'o':
output = strdup(optarg);
break;
case 'f':
filecontexts = strdup(optarg);
break;
case 'G':
attrs_expand_generated = 1;
break;
case 'X': {
char *endptr = NULL;
errno = 0;
attrs_expand_size = strtol(optarg, &endptr, 10);
if (errno != 0 || endptr == optarg || *endptr != '\0') {
fprintf(stderr, "Bad attribute expand size: %s\n", optarg);
usage(argv[0]);
}
if (attrs_expand_size < 0) {
fprintf(stderr, "Attribute expand size must be > 0\n");
usage(argv[0]);
}
break;
}
case 'h':
usage(argv[0]);
case '?':
break;
default:
fprintf(stderr, "Unsupported option: %s\n", optarg);
usage(argv[0]);
}
}
if (optind >= argc) {
fprintf(stderr, "No cil files specified\n");
usage(argv[0]);
}
cil_set_log_level(log_level);
cil_db_init(&db);
cil_set_disable_dontaudit(db, disable_dontaudit);
cil_set_disable_neverallow(db, disable_neverallow);
cil_set_preserve_tunables(db, preserve_tunables);
if (handle_unknown != -1) {
rc = cil_set_handle_unknown(db, handle_unknown);
if (rc != SEPOL_OK) {
goto exit;
}
}
cil_set_mls(db, mls);
cil_set_target_platform(db, target);
cil_set_policy_version(db, policyvers);
cil_set_attrs_expand_generated(db, attrs_expand_generated);
if (attrs_expand_size >= 0) {
cil_set_attrs_expand_size(db, (unsigned)attrs_expand_size);
}
for (i = optind; i < argc; i++) {
file = fopen(argv[i], "r");
if (!file) {
fprintf(stderr, "Could not open file: %s\n", argv[i]);
rc = SEPOL_ERR;
goto exit;
}
rc = stat(argv[i], &filedata);
if (rc == -1) {
fprintf(stderr, "Could not stat file: %s\n", argv[i]);
goto exit;
}
file_size = filedata.st_size;
buffer = malloc(file_size);
rc = fread(buffer, file_size, 1, file);
if (rc != 1) {
fprintf(stderr, "Failure reading file: %s\n", argv[i]);
goto exit;
}
fclose(file);
file = NULL;
rc = cil_add_file(db, argv[i], buffer, file_size);
if (rc != SEPOL_OK) {
fprintf(stderr, "Failure adding %s\n", argv[i]);
goto exit;
}
free(buffer);
buffer = NULL;
}
rc = cil_compile(db);
if (rc != SEPOL_OK) {
fprintf(stderr, "Failed to compile cildb: %d\n", rc);
goto exit;
}
rc = cil_build_policydb(db, &pdb);
if (rc != SEPOL_OK) {
fprintf(stderr, "Failed to build policydb\n");
goto exit;
}
if (output == NULL) {
int size = snprintf(NULL, 0, "policy.%d", policyvers);
output = malloc((size + 1) * sizeof(char));
if (output == NULL) {
fprintf(stderr, "Failed to create output filename\n");
rc = SEPOL_ERR;
goto exit;
}
if (snprintf(output, size + 1, "policy.%d", policyvers) != size) {
fprintf(stderr, "Failed to create output filename\n");
rc = SEPOL_ERR;
goto exit;
}
}
binary = fopen(output, "w");
if (binary == NULL) {
fprintf(stderr, "Failure opening binary file for writing\n");
rc = SEPOL_ERR;
goto exit;
}
rc = sepol_policy_file_create(&pf);
if (rc != 0) {
fprintf(stderr, "Failed to create policy file: %d\n", rc);
goto exit;
}
sepol_policy_file_set_fp(pf, binary);
rc = sepol_policydb_write(pdb, pf);
if (rc != 0) {
fprintf(stderr, "Failed to write binary policy: %d\n", rc);
goto exit;
}
fclose(binary);
binary = NULL;
rc = cil_filecons_to_string(db, &fc_buf, &fc_size);
if (rc != SEPOL_OK) {
fprintf(stderr, "Failed to get file context data\n");
goto exit;
}
if (filecontexts == NULL) {
file_contexts = fopen("file_contexts", "w+");
} else {
file_contexts = fopen(filecontexts, "w+");
}
if (file_contexts == NULL) {
fprintf(stderr, "Failed to open file_contexts file\n");
goto exit;
}
if (fwrite(fc_buf, sizeof(char), fc_size, file_contexts) != fc_size) {
fprintf(stderr, "Failed to write file_contexts file\n");
goto exit;
}
fclose(file_contexts);
file_contexts = NULL;
rc = SEPOL_OK;
exit:
if (binary != NULL) {
fclose(binary);
}
if (file != NULL) {
fclose(file);
}
free(buffer);
free(output);
free(filecontexts);
cil_db_destroy(&db);
sepol_policydb_free(pdb);
sepol_policy_file_free(pf);
free(fc_buf);
return rc;
}
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