/* Takes a module stored in 'module_data' and parses its headers.
* Sets reference variables 'module_name' to module's name and
* 'version' to module's version. The caller is responsible for
* free()ing 'module_name' and 'version'; they will be
* set to NULL upon entering this function. Returns 0 on success, -1
* if out of memory, or -2 if data did not represent a module.
*/
static int parse_module_headers(semanage_handle_t * sh, char *module_data,
size_t data_len, char **module_name, char **version)
{
struct sepol_policy_file *pf;
int file_type;
*version = NULL;
if (sepol_policy_file_create(&pf)) {
ERR(sh, "Out of memory!");
return -1;
}
sepol_policy_file_set_mem(pf, module_data, data_len);
sepol_policy_file_set_handle(pf, sh->sepolh);
if (module_data == NULL ||
data_len == 0 ||
sepol_module_package_info(pf, &file_type, module_name, version) == -1) {
sepol_policy_file_free(pf);
ERR(sh, "Could not parse module data.");
return -2;
}
sepol_policy_file_free(pf);
if (file_type != SEPOL_POLICY_MOD) {
ERR(sh, "Data did not represent a pp module. Please upgrade to the latest version of libsemanage to support hll modules.");
return -2;
}
return 0;
}
/* Writes a module (or a base) to the file given by a fully-qualified
* 'filename'. Returns 0 on success, -1 if file could not be written.
*/
static int semanage_write_module(semanage_handle_t *sh,
const char *filename, sepol_module_package_t *package)
{
struct sepol_policy_file *pf;
FILE *outfile;
int retval;
if (sepol_policy_file_create(&pf)) {
ERR(sh, "Out of memory!");
return -1;
}
if ((outfile = fopen(filename, "wb")) == NULL) {
sepol_policy_file_free(pf);
ERR(sh, "Could not open %s for writing.", filename);
return -1;
}
sepol_policy_file_set_fp(pf, outfile);
sepol_policy_file_set_handle(pf, sh->sepolh);
retval = sepol_module_package_write(package, pf);
fclose(outfile);
sepol_policy_file_free(pf);
if (retval == -1) {
ERR(sh, "Error while writing module to %s.", filename);
return -1;
}
return 0;
}
/* Takes a base module stored in 'module_data' and parse its headers.
* Returns 0 on success, -1 if out of memory, or -2 if data did not
* represent a module.
*/
static int parse_base_headers(semanage_handle_t *sh,
char *module_data, size_t data_len) {
struct sepol_policy_file *pf;
char *module_name = NULL, *version = NULL;
int file_type;
if (sepol_policy_file_create(&pf)) {
ERR(sh, "Out of memory!");
return -1;
}
sepol_policy_file_set_mem(pf, module_data, data_len);
sepol_policy_file_set_handle(pf, sh->sepolh);
if (module_data == NULL ||
data_len == 0 ||
sepol_module_package_info(pf, &file_type,
&module_name, &version) == -1) {
sepol_policy_file_free(pf);
ERR(sh, "Could not parse base module data.");
return -2;
}
sepol_policy_file_free(pf);
free(module_name);
free(version);
if (file_type != SEPOL_POLICY_BASE) {
if (file_type == SEPOL_POLICY_MOD)
ERR(sh, "Received a non-base module, expected a base module.");
else
ERR(sh, "Data did not represent a module.");
return -2;
}
return 0;
}
/* Takes a module stored in 'module_data' and parses its headers.
* Sets reference variables 'filename' to module's fully qualified
* path name into the sandbox, 'module_name' to module's name, and
* 'version' to module's version. The caller is responsible for
* free()ing 'filename', 'module_name', and 'version'; they will be
* set to NULL upon entering this function. Returns 0 on success, -1
* if out of memory, or -2 if data did not represent a module.
*/
static int parse_module_headers(semanage_handle_t *sh, char *module_data,
size_t data_len, char **module_name,
char **version, char **filename) {
struct sepol_policy_file *pf;
int file_type;
const char *module_path;
*module_name = *version = *filename = NULL;
if (sepol_policy_file_create(&pf)) {
ERR(sh, "Out of memory!");
return -1;
}
sepol_policy_file_set_mem(pf, module_data, data_len);
sepol_policy_file_set_handle(pf, sh->sepolh);
if (module_data == NULL ||
data_len == 0 ||
sepol_module_package_info(pf, &file_type, module_name,
version) == -1) {
sepol_policy_file_free(pf);
ERR(sh, "Could not parse module data.");
return -2;
}
sepol_policy_file_free(pf);
if (file_type != SEPOL_POLICY_MOD) {
if (file_type == SEPOL_POLICY_BASE)
ERR(sh, "Received a base module, expected a non-base module.");
else
ERR(sh, "Data did not represent a module.");
return -2;
}
if ((module_path = semanage_path(SEMANAGE_TMP, SEMANAGE_MODULES)) == NULL) {
return -1;
}
if (asprintf(filename, "%s/%s.pp", module_path, *module_name) == -1) {
ERR(sh, "Out of memory!");
return -1;
}
return 0;
}
static void do_fc_check_and_die_on_error(struct selinux_opt opts[], unsigned int backend, filemode mode,
const char *sepolicy_file, const char *context_file, bool allow_empty)
{
struct stat sb;
if (stat(context_file, &sb) < 0) {
perror("Error: could not get stat on file contexts file");
exit(1);
}
if (sb.st_size == 0) {
/* Nothing to check on empty file_contexts file if allowed*/
if (allow_empty) {
return;
}
/* else: We could throw the error here, but libselinux backend will catch it */
}
global_state.sepolicy.file = fopen(sepolicy_file, "r");
if (!global_state.sepolicy.file) {
perror("Error: could not open policy file");
exit(1);
}
global_state.sepolicy.handle = sepol_handle_create();
if (!global_state.sepolicy.handle) {
fprintf(stderr, "Error: could not create policy handle: %s\n", strerror(errno));
exit(1);
}
if (sepol_policy_file_create(&global_state.sepolicy.pf) < 0) {
perror("Error: could not create policy handle");
exit(1);
}
sepol_policy_file_set_fp(global_state.sepolicy.pf, global_state.sepolicy.file);
sepol_policy_file_set_handle(global_state.sepolicy.pf, global_state.sepolicy.handle);
int rc = sepol_policydb_create(&global_state.sepolicy.sdb);
if (rc < 0) {
perror("Error: could not create policy db");
exit(1);
}
rc = sepol_policydb_read(global_state.sepolicy.sdb, global_state.sepolicy.pf);
if (rc < 0) {
perror("Error: could not read file into policy db");
exit(1);
}
global_state.assert.attrs = filemode_to_assert_attrs(mode);
bool ret = ebitmap_attribute_assertion_init(&global_state.assert.set, global_state.assert.attrs);
if (!ret) {
/* error messages logged by ebitmap_attribute_assertion_init() */
exit(1);
}
selinux_set_callback(SELINUX_CB_VALIDATE,
(union selinux_callback)&validate);
opts[1].value = context_file;
global_state.sepolicy.sehnd[0] = selabel_open(backend, opts, 2);
if (!global_state.sepolicy.sehnd[0]) {
fprintf(stderr, "Error: could not load context file from %s\n", context_file);
exit(1);
}
}
/* Allocate an array of module_info structures for each readable
* module within the store. Note that if the calling program has
* already begun a transaction then this function will get a list of
* modules within the sandbox. The caller is responsible for calling
* semanage_module_info_datum_destroy() on each element of the array
* as well as free()ing the entire list.
*/
static int semanage_direct_list(semanage_handle_t *sh,
semanage_module_info_t **modinfo, int *num_modules) {
struct sepol_policy_file *pf = NULL;
int i, retval = -1;
char **module_filenames = NULL;
int num_mod_files;
*modinfo = NULL;
*num_modules = 0;
/* get the read lock when reading from the active
(non-transaction) directory */
if (!sh->is_in_transaction)
if (semanage_get_active_lock(sh) < 0)
return -1;
if (semanage_get_modules_names(sh, &module_filenames, &num_mod_files) == -1) {
goto cleanup;
}
if (num_mod_files == 0) {
retval = semanage_get_commit_number(sh);
goto cleanup;
}
if (sepol_policy_file_create(&pf)) {
ERR(sh, "Out of memory!");
goto cleanup;
}
sepol_policy_file_set_handle(pf, sh->sepolh);
if ((*modinfo = calloc(num_mod_files, sizeof(**modinfo))) == NULL) {
ERR(sh, "Out of memory!");
goto cleanup;
}
for (i = 0; i < num_mod_files; i++) {
FILE *fp;
char *name = NULL, *version = NULL;
int type;
if ((fp = fopen(module_filenames[i], "rb")) == NULL) {
/* could not open this module file, so don't
* report it */
continue;
}
sepol_policy_file_set_fp(pf, fp);
if (sepol_module_package_info(pf, &type, &name, &version)) {
fclose(fp);
free(name);
free(version);
continue;
}
fclose(fp);
if (type == SEPOL_POLICY_MOD) {
(*modinfo)[*num_modules].name = name;
(*modinfo)[*num_modules].version = version;
(*num_modules)++;
}
else {
/* file was not a module, so don't report it */
free(name);
free(version);
}
}
retval = semanage_get_commit_number(sh);
cleanup:
sepol_policy_file_free(pf);
for (i = 0; module_filenames != NULL && i < num_mod_files; i++) {
free(module_filenames[i]);
}
free(module_filenames);
if (!sh->is_in_transaction) {
semanage_release_active_lock(sh);
}
return retval;
}
