/*
 * sestatus -- displays the status of SELinux
 *
 * Ported to busybox: KaiGai Kohei <kaigai@ak.jp.nec.com>
 *
 * Copyright (C) KaiGai Kohei <kaigai@ak.jp.nec.com>
 *
 * Licensed under GPLv2, see file LICENSE in this source tree.
 */
//config:config SESTATUS
//config:       bool "sestatus (12 kb)"
//config:       default n
//config:       depends on SELINUX
//config:       help
//config:       Displays the status of SELinux.

//applet:IF_SESTATUS(APPLET(sestatus, BB_DIR_USR_SBIN, BB_SUID_DROP))

//kbuild:lib-$(CONFIG_SESTATUS) += sestatus.o

//usage:#define sestatus_trivial_usage
//usage:       "[-vb]"
//usage:#define sestatus_full_usage "\n\n"
//usage:       "        -v      Verbose"
//usage:     "\n        -b      Display current state of booleans"

#include "libbb.h"

extern char *selinux_mnt;

#define OPT_VERBOSE  (1 << 0)
#define OPT_BOOLEAN  (1 << 1)

#define COL_FMT  "%-31s "

static void display_boolean(void)
{
        char **bools;
        int i, active, pending, nbool;

        if (security_get_boolean_names(&bools, &nbool) < 0)
                return;

        puts("\nPolicy booleans:");

        for (i = 0; i < nbool; i++) {
                active = security_get_boolean_active(bools[i]);
                if (active < 0)
                        goto skip;
                pending = security_get_boolean_pending(bools[i]);
                if (pending < 0)
                        goto skip;
                printf(COL_FMT "%s",
                                bools[i], active == 0 ? "off" : "on");
                if (active != pending)
                        printf(" (%sactivate pending)", pending == 0 ? "in" : "");
                bb_putchar('\n');
 skip:
                if (ENABLE_FEATURE_CLEAN_UP)
                        free(bools[i]);
        }
        if (ENABLE_FEATURE_CLEAN_UP)
                free(bools);
}

static void read_config(char **pc, int npc, char **fc, int nfc)
{
        char *buf;
        parser_t *parser;
        int pc_ofs = 0, fc_ofs = 0, section = -1;

        pc[0] = fc[0] = NULL;

        parser = config_open("/etc/sestatus.conf");
        while (config_read(parser, &buf, 1, 1, "# \t", PARSE_NORMAL)) {
                if (strcmp(buf, "[process]") == 0) {
                        section = 1;
                } else if (strcmp(buf, "[files]") == 0) {
                        section = 2;
                } else {
                        if (section == 1 && pc_ofs < npc -1) {
                                pc[pc_ofs++] = xstrdup(buf);
                                pc[pc_ofs] = NULL;
                        } else if (section == 2 && fc_ofs < nfc - 1) {
                                fc[fc_ofs++] = xstrdup(buf);
                                fc[fc_ofs] = NULL;
                        }
                }
        }
        config_close(parser);
}

static void display_verbose(void)
{
        security_context_t con, _con;
        char *fc[50], *pc[50], *cterm;
        pid_t *pidList;
        int i;

        read_config(pc, ARRAY_SIZE(pc), fc, ARRAY_SIZE(fc));

        /* process contexts */
        puts("\nProcess contexts:");

        /* current context */
        if (getcon(&con) == 0) {
                printf(COL_FMT "%s\n", "Current context:", con);
                if (ENABLE_FEATURE_CLEAN_UP)
                        freecon(con);
        }
        /* /sbin/init context */
        if (getpidcon(1, &con) == 0) {
                printf(COL_FMT "%s\n", "Init context:", con);
                if (ENABLE_FEATURE_CLEAN_UP)
                        freecon(con);
        }

        /* [process] context */
        for (i = 0; pc[i] != NULL; i++) {
                pidList = find_pid_by_name(bb_basename(pc[i]));
                if (pidList[0] > 0 && getpidcon(pidList[0], &con) == 0) {
                        printf(COL_FMT "%s\n", pc[i], con);
                        if (ENABLE_FEATURE_CLEAN_UP)
                                freecon(con);
                }
                if (ENABLE_FEATURE_CLEAN_UP)
                        free(pidList);
        }

        /* files contexts */
        puts("\nFile contexts:");

        cterm = xmalloc_ttyname(0);
//FIXME: if cterm == NULL, we segfault!??
        puts(cterm);
        if (cterm && lgetfilecon(cterm, &con) >= 0) {
                printf(COL_FMT "%s\n", "Controlling term:", con);
                if (ENABLE_FEATURE_CLEAN_UP)
                        freecon(con);
        }

        for (i = 0; fc[i] != NULL; i++) {
                struct stat stbuf;

                if (lgetfilecon(fc[i], &con) < 0)
                        continue;
                if (lstat(fc[i], &stbuf) == 0) {
                        if (S_ISLNK(stbuf.st_mode)) {
                                if (getfilecon(fc[i], &_con) >= 0) {
                                        printf(COL_FMT "%s -> %s\n", fc[i], _con, con);
                                        if (ENABLE_FEATURE_CLEAN_UP)
                                                freecon(_con);
                                }
                        } else {
                                printf(COL_FMT "%s\n", fc[i], con);
                        }
                }
                if (ENABLE_FEATURE_CLEAN_UP)
                        freecon(con);
        }
}

int sestatus_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int sestatus_main(int argc UNUSED_PARAM, char **argv)
{
        unsigned opts;
        const char *pol_path;
        int rc;

        opts = getopt32(argv, "^" "vb" "\0" "=0"/*no arguments*/);

        /* SELinux status: line */
        rc = is_selinux_enabled();
        if (rc < 0)
                goto error;
        printf(COL_FMT "%s\n", "SELinux status:",
               rc == 1 ? "enabled" : "disabled");

        /* SELinuxfs mount: line */
        if (!selinux_mnt)
                goto error;
        printf(COL_FMT "%s\n", "SELinuxfs mount:",
               selinux_mnt);

        /* Current mode: line */
        rc = security_getenforce();
        if (rc < 0)
                goto error;
        printf(COL_FMT "%s\n", "Current mode:",
               rc == 0 ? "permissive" : "enforcing");

        /* Mode from config file: line */
        if (selinux_getenforcemode(&rc) != 0)
                goto error;
        printf(COL_FMT "%s\n", "Mode from config file:",
               rc < 0 ? "disabled" : (rc == 0 ? "permissive" : "enforcing"));

        /* Policy version: line */
        rc = security_policyvers();
        if (rc < 0)
                goto error;
        printf(COL_FMT "%u\n", "Policy version:", rc);

        /* Policy from config file: line */
        pol_path = selinux_policy_root();
        if (!pol_path)
                goto error;
        printf(COL_FMT "%s\n", "Policy from config file:",
               bb_basename(pol_path));

        if (opts & OPT_BOOLEAN)
                display_boolean();
        if (opts & OPT_VERBOSE)
                display_verbose();

        return 0;

  error:
        bb_simple_perror_msg_and_die("libselinux returns unknown state");
}