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selinux/policycoreutils/semodule/semodule.c

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/* Authors: Karl MacMillan <kmacmillan@tresys.com>
* Joshua Brindle <jbrindle@tresys.com>
* Jason Tang <jtang@tresys.com>
*
* Copyright (C) 2004-2005 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, version 2.
*/
#include <fcntl.h>
#include <getopt.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <libgen.h>
#include <limits.h>
#include <sepol/cil/cil.h>
#include <semanage/modules.h>
enum client_modes {
NO_MODE, INSTALL_M, REMOVE_M, EXTRACT_M, CIL_M, HLL_M,
LIST_M, RELOAD, PRIORITY_M, ENABLE_M, DISABLE_M
};
/* list of modes in which one ought to commit afterwards */
static const int do_commit[] = {
0, 1, 1, 0, 0, 0,
0, 0, 0, 1, 1,
};
struct command {
enum client_modes mode;
char *arg;
};
static struct command *commands = NULL;
static int num_commands = 0;
/* options given on command line */
static int verbose;
static int reload;
static int no_reload;
static int build;
static int check_ext_changes;
static int disable_dontaudit;
static int preserve_tunables;
static int ignore_module_cache;
static uint16_t priority;
static int priority_set = 0;
static semanage_handle_t *sh = NULL;
static char *store;
static char *store_root;
int extract_cil = 0;
static int checksum = 0;
extern char *optarg;
extern int optind;
static void cleanup(void)
{
while (--num_commands >= 0) {
free(commands[num_commands].arg);
}
free(commands);
}
/* Signal handlers. */
static void handle_signal(int sig_num)
{
if (sig_num == SIGINT || sig_num == SIGQUIT || sig_num == SIGTERM) {
/* catch these signals, and then drop them */
}
}
static void set_store(char *storename)
{
/* For now this only supports a store name, later on this
* should support an address for a remote connection */
if ((store = strdup(storename)) == NULL) {
fprintf(stderr, "Out of memory!\n");
goto bad;
}
return;
bad:
cleanup();
exit(1);
}
static void set_store_root(char *path)
{
if ((store_root = strdup(path)) == NULL) {
fprintf(stderr, "Out of memory!\n");
goto bad;
}
return;
bad:
cleanup();
exit(1);
}
/* Establish signal handlers for the process. */
static void create_signal_handlers(void)
{
if (signal(SIGINT, handle_signal) == SIG_ERR ||
signal(SIGQUIT, handle_signal) == SIG_ERR ||
signal(SIGTERM, handle_signal) == SIG_ERR) {
fprintf(stderr, "Could not set up signal handler.\n");
exit(255);
}
}
static void usage(char *progname)
{
printf("usage: %s [option]... MODE...\n", progname);
printf("Manage SELinux policy modules.\n");
printf("MODES:\n");
printf(" -R, --reload reload policy\n");
printf(" -B, --build build and reload policy\n");
printf(" -D,--disable_dontaudit Remove dontaudits from policy\n");
printf(" -i,--install=MODULE_PKG install a new module\n");
printf(" -r,--remove=MODULE_NAME remove existing module at desired priority\n");
printf(" -l[KIND],--list-modules[=KIND] display list of installed modules\n");
printf(" KIND: standard list highest priority, enabled modules\n");
printf(" full list all modules\n");
printf(" -X,--priority=PRIORITY set priority for following operations (1-999)\n");
printf(" -e,--enable=MODULE_NAME enable module\n");
printf(" -d,--disable=MODULE_NAME disable module\n");
printf(" -E,--extract=MODULE_NAME extract module\n");
printf("Options:\n");
printf(" -s,--store name of the store to operate on\n");
printf(" -N,-n,--noreload do not reload policy after commit\n");
printf(" -h,--help print this message and quit\n");
printf(" -v,--verbose be verbose\n");
printf(" -P,--preserve_tunables Preserve tunables in policy\n");
printf(" -C,--ignore-module-cache Rebuild CIL modules compiled from HLL files\n");
printf(" -p,--path use an alternate path for the policy root\n");
printf(" -S,--store-path use an alternate path for the policy store root\n");
printf(" -c, --cil extract module as cil. This only affects module extraction.\n");
printf(" -H, --hll extract module as hll. This only affects module extraction.\n");
printf(" -m, --checksum print module checksum (SHA256).\n");
printf(" --refresh like --build, but reuses existing linked policy if no\n"
" changes to module files are detected (via checksum)\n");
printf("Deprecated options:\n");
printf(" -b,--base same as --install\n");
printf(" --rebuild-if-modules-changed\n"
" same as --refresh\n");
}
/* Sets the global mode variable to new_mode, but only if no other
* mode has been given. */
static void set_mode(enum client_modes new_mode, char *arg)
{
struct command *c;
char *s;
if ((c = realloc(commands, sizeof(*c) * (num_commands + 1))) == NULL) {
fprintf(stderr, "Out of memory!\n");
cleanup();
exit(1);
}
commands = c;
commands[num_commands].mode = new_mode;
commands[num_commands].arg = NULL;
num_commands++;
if (arg != NULL) {
if ((s = strdup(arg)) == NULL) {
fprintf(stderr, "Out of memory!\n");
cleanup();
exit(1);
}
commands[num_commands - 1].arg = s;
}
}
/* Parse command line and set global options. */
static void parse_command_line(int argc, char **argv)
{
static struct option opts[] = {
{"rebuild-if-modules-changed", 0, NULL, '\0'},
{"refresh", 0, NULL, '\0'},
{"store", required_argument, NULL, 's'},
{"base", required_argument, NULL, 'b'},
{"help", 0, NULL, 'h'},
{"install", required_argument, NULL, 'i'},
{"extract", required_argument, NULL, 'E'},
{"cil", 0, NULL, 'c'},
{"hll", 0, NULL, 'H'},
{"list-modules", optional_argument, NULL, 'l'},
{"verbose", 0, NULL, 'v'},
{"remove", required_argument, NULL, 'r'},
{"upgrade", required_argument, NULL, 'u'},
{"reload", 0, NULL, 'R'},
{"noreload", 0, NULL, 'n'},
{"build", 0, NULL, 'B'},
{"disable_dontaudit", 0, NULL, 'D'},
{"preserve_tunables", 0, NULL, 'P'},
{"ignore-module-cache", 0, NULL, 'C'},
{"priority", required_argument, NULL, 'X'},
{"enable", required_argument, NULL, 'e'},
{"disable", required_argument, NULL, 'd'},
{"path", required_argument, NULL, 'p'},
{"store-path", required_argument, NULL, 'S'},
{"checksum", 0, NULL, 'm'},
{NULL, 0, NULL, 0}
};
int extract_selected = 0;
int cil_hll_set = 0;
int i, longind;
verbose = 0;
reload = 0;
no_reload = 0;
check_ext_changes = 0;
priority = 400;
while ((i =
getopt_long(argc, argv, "s:b:hi:l::vr:u:RnNBDCPX:e:d:p:S:E:cHm",
opts, &longind)) != -1) {
switch (i) {
case '\0':
switch(longind) {
case 0: /* --rebuild-if-modules-changed */
fprintf(stderr, "The --rebuild-if-modules-changed option is deprecated. Use --refresh instead.\n");
/* fallthrough */
case 1: /* --refresh */
check_ext_changes = 1;
break;
default:
usage(argv[0]);
exit(1);
}
break;
case 'b':
fprintf(stderr, "The --base option is deprecated. Use --install instead.\n");
set_mode(INSTALL_M, optarg);
break;
case 'h':
usage(argv[0]);
exit(0);
case 'i':
set_mode(INSTALL_M, optarg);
break;
case 'E':
set_mode(EXTRACT_M, optarg);
extract_selected = 1;
break;
case 'c':
set_mode(CIL_M, NULL);
cil_hll_set = 1;
break;
case 'H':
set_mode(HLL_M, NULL);
cil_hll_set = 1;
break;
case 'l':
set_mode(LIST_M, optarg);
break;
case 'v':
verbose++;
break;
case 'r':
set_mode(REMOVE_M, optarg);
break;
case 'u':
fprintf(stderr, "The --upgrade option is deprecated. Use --install instead.\n");
set_mode(INSTALL_M, optarg);
break;
case 's':
set_store(optarg);
break;
case 'p':
semanage_set_root(optarg);
break;
case 'S':
set_store_root(optarg);
break;
case 'R':
reload = 1;
break;
case 'n':
no_reload = 1;
break;
case 'N':
no_reload = 1;
break;
case 'B':
build = 1;
break;
case 'D':
disable_dontaudit = 1;
break;
case 'P':
preserve_tunables = 1;
break;
case 'C':
ignore_module_cache = 1;
break;
case 'X':
set_mode(PRIORITY_M, optarg);
break;
case 'e':
set_mode(ENABLE_M, optarg);
break;
case 'd':
set_mode(DISABLE_M, optarg);
break;
case 'm':
checksum = 1;
break;
case '?':
default:{
usage(argv[0]);
exit(1);
}
}
}
if ((build || reload || check_ext_changes) && num_commands) {
fprintf(stderr,
"build or reload should not be used with other commands\n");
usage(argv[0]);
exit(1);
}
if (num_commands == 0 && reload == 0 && build == 0 && check_ext_changes == 0) {
fprintf(stderr, "At least one mode must be specified.\n");
usage(argv[0]);
exit(1);
}
if (extract_selected == 0 && cil_hll_set == 1) {
fprintf(stderr, "--cil and --hll require a module to export with the --extract option.\n");
usage(argv[0]);
exit(1);
}
if (optind < argc) {
int mode = commands ? (int) commands[num_commands - 1].mode : -1;
/* if -i/u/r/E was the last command treat any remaining
* arguments as args. Will allow 'semodule -i *.pp' to
* work as expected.
*/
switch (mode) {
case INSTALL_M:
case REMOVE_M:
case EXTRACT_M:
case ENABLE_M:
case DISABLE_M:
while (optind < argc)
set_mode(mode, argv[optind++]);
break;
default:
fprintf(stderr, "unknown additional arguments:\n");
while (optind < argc)
fprintf(stderr, " %s", argv[optind++]);
fprintf(stderr, "\n\n");
usage(argv[0]);
exit(1);
}
}
}
/* Get module checksum */
static char *hash_module_data(const char *module_name, const int prio) {
semanage_module_key_t *modkey = NULL;
char *hash_str = NULL;
void *hash = NULL;
size_t hash_len = 0;
int result;
result = semanage_module_key_create(sh, &modkey);
if (result != 0) {
goto cleanup;
}
result = semanage_module_key_set_name(sh, modkey, module_name);
if (result != 0) {
goto cleanup;
}
result = semanage_module_key_set_priority(sh, modkey, prio);
if (result != 0) {
goto cleanup;
}
result = semanage_module_compute_checksum(sh, modkey, 1, &hash_str,
&hash_len);
if (result != 0) {
goto cleanup;
}
cleanup:
free(hash);
semanage_module_key_destroy(sh, modkey);
free(modkey);
return hash_str;
}
int main(int argc, char *argv[])
{
int i, commit = 0;
int result;
int status = EXIT_FAILURE;
const char *genhomedirconargv[] = { "genhomedircon", "-B", "-n" };
create_signal_handlers();
if (strcmp(basename(argv[0]), "genhomedircon") == 0) {
argc = 3;
argv = (char **)genhomedirconargv;
}
parse_command_line(argc, argv);
cil_set_log_level(CIL_ERR + verbose);
if (build || check_ext_changes)
commit = 1;
sh = semanage_handle_create();
if (!sh) {
fprintf(stderr, "%s: Could not create semanage handle\n",
argv[0]);
goto cleanup_nohandle;
}
if (store) {
/* Set the store we want to connect to, before connecting.
* this will always set a direct connection now, an additional
* option will need to be used later to specify a policy server
* location */
semanage_select_store(sh, store, SEMANAGE_CON_DIRECT);
}
if (store_root) {
semanage_set_store_root(sh, store_root);
}
/* create store if necessary, for bootstrapping */
semanage_set_create_store(sh, 1);
if ((result = semanage_connect(sh)) < 0) {
fprintf(stderr, "%s: Could not connect to policy handler\n",
argv[0]);
goto cleanup;
}
if (reload) {
if ((result = semanage_reload_policy(sh)) < 0) {
fprintf(stderr, "%s: Could not reload policy\n",
argv[0]);
goto cleanup;
}
}
if (build || check_ext_changes) {
if ((result = semanage_begin_transaction(sh)) < 0) {
fprintf(stderr, "%s: Could not begin transaction: %s\n",
argv[0], errno ? strerror(errno) : "");
goto cleanup;
}
}
if ((result = semanage_set_default_priority(sh, priority)) != 0) {
fprintf(stderr,
"%s: Invalid priority %d (needs to be between 1 and 999)\n",
argv[0],
priority);
goto cleanup;
}
for (i = 0; i < num_commands; i++) {
enum client_modes mode = commands[i].mode;
char *mode_arg = commands[i].arg;
switch (mode) {
case INSTALL_M:{
if (verbose) {
printf
("Attempting to install module '%s':\n",
mode_arg);
}
result =
semanage_module_install_file(sh, mode_arg);
break;
}
case EXTRACT_M:{
semanage_module_info_t *extract_info = NULL;
semanage_module_key_t *modkey = NULL;
uint16_t curr_priority;
void *data = NULL;
size_t data_len = 0;
char output_path[PATH_MAX];
const char *output_name = NULL;
const char *lang_ext = NULL;
int rlen;
FILE *output_fd = NULL;
result = semanage_module_key_create(sh, &modkey);
if (result != 0) {
goto cleanup_extract;
}
result = semanage_module_key_set_name(sh, modkey, mode_arg);
if (result != 0) {
goto cleanup_extract;
}
if (priority_set == 0) {
result = semanage_module_get_module_info(sh, modkey, &extract_info);
if (result != 0) {
goto cleanup_extract;
}
semanage_module_info_get_priority(sh, extract_info, &curr_priority);
printf("Extracting at highest existing priority '%d'.\n", curr_priority);
priority = curr_priority;
}
result = semanage_module_key_set_priority(sh, modkey, priority);
if (result != 0) {
goto cleanup_extract;
}
if (verbose) {
printf
("Attempting to extract module '%s':\n",
mode_arg);
}
result = semanage_module_extract(sh, modkey, extract_cil, &data, &data_len, &extract_info);
if (result != 0) {
goto cleanup_extract;
}
if (extract_cil) {
lang_ext = "cil";
} else {
result = semanage_module_info_get_lang_ext(sh, extract_info, &lang_ext);
if (result != 0) {
goto cleanup_extract;
}
}
result = semanage_module_info_get_name(sh, extract_info, &output_name);
if (result != 0) {
goto cleanup_extract;
}
rlen = snprintf(output_path, PATH_MAX, "%s.%s", output_name, lang_ext);
if (rlen < 0 || rlen >= PATH_MAX) {
fprintf(stderr, "%s: Failed to generate output path.\n", argv[0]);
result = -1;
goto cleanup_extract;
}
output_fd = fopen(output_path, "wx");
if (output_fd == NULL) {
if (errno == EEXIST)
fprintf(stderr, "%s: %s is already extracted with extension %s.\n", argv[0], mode_arg, lang_ext);
else
fprintf(stderr, "%s: Unable to open %s: %s\n", argv[0], output_path, strerror(errno));
result = -1;
goto cleanup_extract;
}
if (fwrite(data, 1, data_len, output_fd) < data_len) {
fprintf(stderr, "%s: Unable to write to %s\n", argv[0], output_path);
result = -1;
goto cleanup_extract;
}
cleanup_extract:
if (output_fd != NULL) {
fclose(output_fd);
}
if (data_len > 0) {
munmap(data, data_len);
}
semanage_module_info_destroy(sh, extract_info);
free(extract_info);
semanage_module_key_destroy(sh, modkey);
free(modkey);
break;
}
case CIL_M:
extract_cil = 1;
break;
case HLL_M:
extract_cil = 0;
break;
case REMOVE_M:{
if (verbose) {
printf
("Attempting to remove module '%s':\n",
mode_arg);
}
result = semanage_module_remove(sh, mode_arg);
if ( result == -2 ) {
continue;
}
break;
}
case LIST_M:{
semanage_module_info_t *modinfos = NULL;
int modinfos_len = 0;
semanage_module_info_t *m = NULL;
int j = 0;
char *module_checksum = NULL;
uint16_t pri = 0;
if (verbose) {
printf
("Attempting to list active modules:\n");
}
if (mode_arg == NULL || strcmp(mode_arg, "standard") == 0) {
result = semanage_module_list(sh,
&modinfos,
&modinfos_len);
if (result < 0) goto cleanup_list;
if (modinfos_len == 0) {
printf("No modules.\n");
}
const char *name = NULL;
for (j = 0; j < modinfos_len; j++) {
m = semanage_module_list_nth(modinfos, j);
result = semanage_module_info_get_name(sh, m, &name);
if (result != 0) goto cleanup_list;
result = semanage_module_info_get_priority(sh, m, &pri);
if (result != 0) goto cleanup_list;
printf("%s", name);
if (checksum) {
module_checksum = hash_module_data(name, pri);
if (module_checksum) {
printf(" %s", module_checksum);
free(module_checksum);
}
}
printf("\n");
}
}
else if (strcmp(mode_arg, "full") == 0) {
/* get the modules */
result = semanage_module_list_all(sh,
&modinfos,
&modinfos_len);
if (result != 0) goto cleanup_list;
if (modinfos_len == 0) {
printf("No modules.\n");
}
/* calculate column widths */
size_t column[5] = { 0, 0, 0, 0, 0 };
/* fixed width columns */
column[0] = sizeof("000") - 1;
column[3] = sizeof("disabled") - 1;
result = semanage_module_compute_checksum(sh, NULL, 0, NULL,
&column[4]);
if (result != 0) goto cleanup_list;
/* variable width columns */
const char *tmp = NULL;
size_t size;
for (j = 0; j < modinfos_len; j++) {
m = semanage_module_list_nth(modinfos, j);
result = semanage_module_info_get_name(sh, m, &tmp);
if (result != 0) goto cleanup_list;
size = strlen(tmp);
if (size > column[1]) column[1] = size;
result = semanage_module_info_get_lang_ext(sh, m, &tmp);
if (result != 0) goto cleanup_list;
size = strlen(tmp);
if (size > column[2]) column[2] = size;
}
/* print out each module */
for (j = 0; j < modinfos_len; j++) {
const char *name = NULL;
int enabled = 0;
const char *lang_ext = NULL;
m = semanage_module_list_nth(modinfos, j);
result = semanage_module_info_get_priority(sh, m, &pri);
if (result != 0) goto cleanup_list;
result = semanage_module_info_get_name(sh, m, &name);
if (result != 0) goto cleanup_list;
result = semanage_module_info_get_enabled(sh, m, &enabled);
if (result != 0) goto cleanup_list;
result = semanage_module_info_get_lang_ext(sh, m, &lang_ext);
if (result != 0) goto cleanup_list;
printf("%0*u %-*s %-*s %-*s",
(int)column[0], pri,
(int)column[1], name,
(int)column[2], lang_ext,
(int)column[3], enabled ? "" : "disabled");
if (checksum) {
module_checksum = hash_module_data(name, pri);
if (module_checksum) {
printf(" %-*s", (int)column[4], module_checksum);
free(module_checksum);
}
}
printf("\n");
}
}
else {
result = -1;
}
cleanup_list:
for (j = 0; j < modinfos_len; j++) {
m = semanage_module_list_nth(modinfos, j);
semanage_module_info_destroy(sh, m);
}
free(modinfos);
break;
}
case PRIORITY_M:{
char *endptr = NULL;
priority = (uint16_t)strtoul(mode_arg, &endptr, 10);
priority_set = 1;
if ((result = semanage_set_default_priority(sh, priority)) != 0) {
fprintf(stderr,
"%s: Invalid priority %d (needs to be between 1 and 999)\n",
argv[0],
priority);
goto cleanup;
}
break;
}
case ENABLE_M:{
if (verbose) {
printf
("Attempting to enable module '%s':\n",
mode_arg);
}
semanage_module_key_t *modkey = NULL;
result = semanage_module_key_create(sh, &modkey);
if (result != 0) goto cleanup_enable;
result = semanage_module_key_set_name(sh, modkey, mode_arg);
if (result != 0) goto cleanup_enable;
result = semanage_module_set_enabled(sh, modkey, 1);
if (result != 0) goto cleanup_enable;
cleanup_enable:
semanage_module_key_destroy(sh, modkey);
free(modkey);
break;
}
case DISABLE_M:{
if (verbose) {
printf
("Attempting to disable module '%s':\n",
mode_arg);
}
semanage_module_key_t *modkey = NULL;
result = semanage_module_key_create(sh, &modkey);
if (result != 0) goto cleanup_disable;
result = semanage_module_key_set_name(sh, modkey, mode_arg);
if (result != 0) goto cleanup_disable;
result = semanage_module_set_enabled(sh, modkey, 0);
if (result != 0) goto cleanup_disable;
cleanup_disable:
semanage_module_key_destroy(sh, modkey);
free(modkey);
break;
}
default:{
fprintf(stderr,
"%s: Unknown mode specified.\n",
argv[0]);
usage(argv[0]);
goto cleanup;
}
}
commit += do_commit[mode];
if (result < 0) {
fprintf(stderr, "%s: Failed on %s!\n", argv[0],
mode_arg ? : "list");
goto cleanup;
} else if (verbose) {
printf("Ok: return value of %d.\n", result);
}
}
if (commit) {
if (verbose)
printf("Committing changes:\n");
if (no_reload)
semanage_set_reload(sh, 0);
if (build)
semanage_set_rebuild(sh, 1);
if (check_ext_changes)
semanage_set_check_ext_changes(sh, 1);
if (disable_dontaudit)
semanage_set_disable_dontaudit(sh, 1);
else if (build)
semanage_set_disable_dontaudit(sh, 0);
if (preserve_tunables)
semanage_set_preserve_tunables(sh, 1);
if (ignore_module_cache)
semanage_set_ignore_module_cache(sh, 1);
result = semanage_commit(sh);
}
if (result < 0) {
fprintf(stderr, "%s: Failed!\n", argv[0]);
goto cleanup;
} else if (commit && verbose) {
printf("Ok: transaction number %d.\n", result);
}
if (semanage_disconnect(sh) < 0) {
fprintf(stderr, "%s: Error disconnecting\n", argv[0]);
goto cleanup;
}
status = EXIT_SUCCESS;
cleanup:
if (semanage_is_connected(sh)) {
if (semanage_disconnect(sh) < 0) {
fprintf(stderr, "%s: Error disconnecting\n", argv[0]);
}
}
semanage_handle_destroy(sh);
cleanup_nohandle:
cleanup();
exit(status);
}
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