<?php
namespace App\Console\Commands;
use Illuminate\Console\Command;
use App\Models\Setting;
use Exception;
use Illuminate\Support\Facades\Crypt;
/**
* Check if a given ip is in a network
* @param string $ip IP to check in IPV4 format eg. 127.0.0.1
* @param string $range IP/CIDR netmask eg. 127.0.0.0/24, also 127.0.0.1 is accepted and /32 assumed
* @return boolean true if the ip is in this range / false if not.
*/
function ip_in_range( $ip, $range ) {
if ( strpos( $range, '/' ) == false ) {
$range .= '/32';
}
// $range is in IP/CIDR format eg 127.0.0.1/24
list( $range, $netmask ) = explode( '/', $range, 2 );
$range_decimal = ip2long( $range );
$ip_decimal = ip2long( $ip );
$wildcard_decimal = pow( 2, ( 32 - $netmask ) ) - 1;
$netmask_decimal = ~ $wildcard_decimal;
return ( ( $ip_decimal & $netmask_decimal ) == ( $range_decimal & $netmask_decimal ) );
}
// NOTE - this function was shamelessly stolen from this gist: https://gist.github.com/tott/7684443
/**
* Ensure LDAP filters are parentheses-wrapped
*/
function parenthesized_filter($filter)
{
if(substr($filter,0,1) == "(" ) {
return $filter;
} else {
return "(".$filter.")";
}
}
class LdapTroubleshooter extends Command
{
/**
* The name and signature of the console command.
*
* @var string
*/
protected $signature = 'ldap:troubleshoot
{--ldap-search : Output an ldapsearch command-line for testing your LDAP config}
{--force : Skip the interactive yes/no prompt for confirmation}
{--debug : Include debugging output (verbose)}
{--trace : Include extremely verbose LDAP trace output}
{--timeout=15 : Timeout for LDAP Bind operations}';
/**
* The console command description.
*
* @var string
*/
protected $description = 'Runs a series of non-destructive LDAP commands to help try and determine correct LDAP settings for your environment.';
/**
* Create a new command instance.
*
* @return void
*/
public function __construct()
{
parent::__construct();
}
/**
* Output something *only* if debug is enabled
*
* @return void
*/
public function debugout($string)
{
if($this->option('debug')) {
$this->line($string);
}
}
/**
* Clean the results from ldap_get_entries into something useful
* @param array $array
* @return array
*/
public function ldap_results_cleaner ($array) {
$cleaned = [];
for($i = 0; $i < $array['count']; $i++) {
$row = $array[$i];
$clean_row = [];
foreach($row AS $key => $val ) {
$this->debugout("Key is: ".$key);
if($key == "count" || is_int($key) || $key == "dn") {
$this->debugout(" and we're gonna skip it\n");
continue;
}
$this->debugout(" And that seems fine.\n");
if(array_key_exists('count',$val)) {
if($val['count'] == 1) {
$clean_row[$key] = $val[0];
} else {
unset($val['count']); //these counts are annoying
$elements = [];
foreach($val as $entry) {
if(isset($ldap_constants[$entry])) {
$elements[] = $ldap_constants[$entry];
} else {
$elements[] = $entry;
}
}
$clean_row[$key] = $elements;
}
} else {
$clean_row[$key] = $val;
}
}
$cleaned[$i] = $clean_row;
}
return $cleaned;
}
/**
* Execute the console command.
*
* @return mixed
*/
public function handle()
{
if($this->option('trace')) {
ldap_set_option(NULL, LDAP_OPT_DEBUG_LEVEL, 7);
}
$settings = Setting::getSettings();
$this->settings = $settings;
if($this->option('ldap-search')) {
if(!$this->option('force')) {
$confirmation = $this->confirm('WARNING: This command will display your LDAP password on your terminal. Are you sure this is ok?');
if(!$confirmation) {
$this->error('ABORTING');
exit(-1);
}
}
$output = [];
if($settings->ldap_server_cert_ignore) {
$this->line("# Ignoring server certificate validity");
$output[] = "LDAPTLS_REQCERT=never";
}
if($settings->ldap_client_tls_cert && $settings->ldap_client_tls_key) {
$this->line("# Adding LDAP Client Certificate and Key");
$output[] = "LDAPTLS_CERT=storage/ldap_client_tls.cert";
$output[] = "LDAPTLS_KEY=storage/ldap_client_tls.key";
}
$output[] = "ldapsearch";
$output[] = "-H ".$settings->ldap_server;
$output[] = "-x";
$output[] = "-b ".escapeshellarg($settings->ldap_basedn);
$output[] = "-D ".escapeshellarg($settings->ldap_uname);
$output[] = "-w ".escapeshellarg(Crypt::Decrypt($settings->ldap_pword));
$output[] = escapeshellarg(parenthesized_filter($settings->ldap_filter));
if($settings->ldap_tls) {
$this->line("# adding STARTTLS option");
$output[] = "-Z";
}
$output[] = "-v";
$this->line("\n");
$this->line(implode(" \\\n",$output));
exit(0);
}
if(!$this->option('force')) {
$confirmation = $this->confirm('WARNING: This command will make several attempts to connect to your LDAP server. Are you sure this is ok?');
if(!$confirmation) {
$this->error('ABORTING');
exit(-1);
}
}
//$this->line(print_r($settings,true));
$this->info("STAGE 1: Checking settings");
if(!$settings->ldap_enabled) {
$this->error("WARNING: Snipe-IT's LDAP setting is not turned on. (That may be OK if you're still trying to figure out settings)");
}
$ldap_conn = false;
try {
$ldap_conn = ldap_connect($settings->ldap_server);
} catch (Exception $e) {
$this->error("WARNING: Exception caught when executing 'ldap_connect()' - ".$e->getMessage().". We will try to guess.");
}
if(!$ldap_conn) {
$this->error("WARNING: LDAP Server setting of: ".$settings->ldap_server." cannot be parsed. We will try to guess.");
//exit(-1);
}
//since we never use $ldap_conn again, we don't have to ldap_unbind() it (it's not even connected, tbh - that only happens at bind-time)
$parsed = parse_url($settings->ldap_server);
if(@$parsed['scheme'] != 'ldap' && @$parsed['scheme'] != 'ldaps') {
$this->error("WARNING: LDAP URL Scheme of '".@$parsed['scheme']."' is probably incorrect; should usually be ldap or ldaps");
}
if(!@$parsed['host']) {
$this->error("ERROR: Cannot determine hostname or IP from ldap URL: ".$settings->ldap_server.". ABORTING.");
exit(-1);
} else {
$this->info("Determined LDAP hostname to be: ".$parsed['host']);
}
$this->info("Performing DNS lookup of: ".$parsed['host']);
$ips = dns_get_record($parsed['host']);
$raw_ips = [];
//$this->info("Host IP is: ".print_r($ips,true));
if(!$ips || count($ips) == 0) {
$this->error("ERROR: DNS lookup of host: ".$parsed['host']." has failed. ABORTING.");
exit(-1);
}
$this->debugout("IP's? ".print_r($ips,true));
foreach($ips as $ip) {
if(!isset($ip['ip'])) {
continue;
}
$raw_ips[]=$ip['ip'];
if($ip['ip'] == "127.0.0.1") {
$this->error("WARNING: Using the localhost IP as the LDAP server. This is usually wrong");
}
if(ip_in_range($ip['ip'],'10.0.0.0/8') || ip_in_range($ip['ip'],'192.168.0.0/16') || ip_in_range($ip['ip'], '172.16.0.0/12')) {
$this->error("WARNING: Using an RFC1918 Private address for LDAP server. This may be correct, but it can be a problem if your Snipe-IT instance is not hosted on your private network");
}
}
$this->info("STAGE 2: Checking basic network connectivity");
$ports = [389,636];
if(@$parsed['port'] && !in_array($parsed['port'],$ports)) {
$ports[] = $parsed['port'];
}
$open_ports=[];
foreach($ports as $port ) {
$errno = 0;
$errstr = '';
$timeout = 30.0;
$result = '';
$this->info("Attempting to connect to port: ".$port." - may take up to $timeout seconds");
try {
$result = fsockopen($parsed['host'], $port, $errno, $errstr, 30.0);
} catch(Exception $e) {
$this->error("Exception: ".$e->getMessage());
}
if($result) {
$this->info("Success!");
$open_ports[] = $port;
} else {
$this->error("WARNING: Cannot connect to port: $port - $errstr ($errno)");
}
}
if(count($open_ports) == 0) {
$this->error("ERROR - no open ports. ABORTING.");
exit(-1);
}
$this->info("STAGE 3: Determine encryption algorithm, if any");
$ldap_urls = [];
$pretty_ldap_urls = [];
foreach($open_ports as $port) {
$this->line("Trying TLS first for port $port");
$ldap_url = "ldaps://".$parsed['host'].":$port";
if($this->test_anonymous_bind($ldap_url)) {
$this->info("Anonymous bind succesful to $ldap_url!");
$ldap_urls[] = [ $ldap_url, true, false ];
$pretty_ldap_urls[] = [ $ldap_url, "YES", "no" ];
continue; // TODO - lots of copypasta in these if(test_anonymous_bind()) routines...
} else {
$this->error("WARNING: Failed to bind to $ldap_url - trying without certificate checks.");
}
if($this->test_anonymous_bind($ldap_url, false)) {
$this->info("Anonymous bind succesful to $ldap_url with certifcate-checks disabled");
$ldap_urls[] = [ $ldap_url, false, false ];
$pretty_ldap_urls[] = [ $ldap_url, "no", "no" ];
continue;
} else {
$this->error("WARNING: Failed to bind to $ldap_url with certificate checks disabled. Trying unencrypted with STARTTLS");
}
$ldap_url = "ldap://".$parsed['host'].":$port";
if($this->test_anonymous_bind($ldap_url, true, true)) {
$this->info("Plain connection to $ldap_url with STARTTLS succesful!");
$ldap_urls[] = [ $ldap_url, true, true ];
$pretty_ldap_urls[] = [ $ldap_url, "YES", "YES" ];
continue;
} else {
$this->error("WARNING: Failed to bind to $ldap_url with STARTTLS enabled. Trying without STARTTLS");
}
if($this->test_anonymous_bind($ldap_url)) {
$this->info("Plain connection to $ldap_url succesful!");
$ldap_urls[] = [ $ldap_url, true, false ];
$pretty_ldap_urls[] = [ $ldap_url, "YES", "no" ];
continue;
} else {
$this->error("WARNING: Failed to bind to $ldap_url. Giving up on port $port");
}
}
$this->debugout(print_r($ldap_urls,true));
if(count($ldap_urls) > 0 ) {
$this->info("Found working LDAP URL's: ");
foreach($ldap_urls as $ldap_url) { // TODO maybe do this as a $this->table() instead?
$this->info("LDAP URL: ".$ldap_url[0]);
$this->info($ldap_url[0]. ($ldap_url[1] ? " certificate checks enabled" : " certificate checks disabled"). ($ldap_url[2] ? " STARTTLS Enabled ": " STARTTLS Disabled"));
}
$this->table(["URL", "Cert Checks Enabled?", "STARTTLS Enabled?"],$pretty_ldap_urls);
} else {
$this->error("ERROR - no valid LDAP URL's available - ABORTING");
exit(1);
}
$this->info("STAGE 4: Test Administrative Bind for LDAP Sync");
foreach($ldap_urls AS $ldap_url) {
$this->test_authed_bind($ldap_url[0], $ldap_url[1], $ldap_url[2], $settings->ldap_uname, Crypt::decrypt($settings->ldap_pword));
}
$this->info("STAGE 5: Test BaseDN");
//grab all LDAP_ constants and fill up a reversed array mapping from weird LDAP dotted-strings to (Constant Name)
$all_defined_constants = get_defined_constants();
$ldap_constants = [];
foreach($all_defined_constants AS $key => $val) {
if(starts_with($key,"LDAP_") && is_string($val)) {
$ldap_constants[$val] = $key; // INVERT the meaning here!
}
}
$this->debugout("LDAP constants are: ".print_r($ldap_constants,true));
foreach($ldap_urls AS $ldap_url) {
if($this->test_informational_bind($ldap_url[0],$ldap_url[1],$ldap_url[2],$settings->ldap_uname,Crypt::decrypt($settings->ldap_pword),$settings)) {
$this->info("Success getting informational bind!");
} else {
$this->error("Unable to get information from bind.");
}
}
$this->info("STAGE 6: Test LDAP Login to Snipe-IT");
foreach($ldap_urls AS $ldap_url) {
$this->info("Starting auth to ".$ldap_url[0]);
while(true) {
$with_tls = $ldap_url[1] ? "with": "without";
$with_startssl = $ldap_url[2] ? "using": "not using";
if(!$this->confirm('Do you wish to try to authenticate to this directory: '.$ldap_url[0]." $with_tls TLS and $with_startssl STARTSSL?")) {
break;
}
$username = $this->ask("Username");
$password = $this->secret("Password");
$this->test_authed_bind($ldap_url[0], $ldap_url[1], $ldap_url[2], $username, $password); // FIXME - should do some other stuff here, maybe with the concatenating or something? maybe? and/or should put up some results?
}
}
$this->info("LDAP TROUBLESHOOTING COMPLETE!");
}
public function connect_to_ldap($ldap_url, $check_cert, $start_tls)
{
$lconn = ldap_connect($ldap_url);
ldap_set_option($lconn, LDAP_OPT_PROTOCOL_VERSION, 3); // should we 'test' different protocol versions here? Does anyone even use anything other than LDAPv3?
// no - it's formally deprecated: https://tools.ietf.org/html/rfc3494
if(!$check_cert) {
putenv('LDAPTLS_REQCERT=never'); // This is horrible; is this *really* the only way to do it?
} else {
putenv('LDAPTLS_REQCERT'); // have to very explicitly and manually *UN* set the env var here to ensure it works
}
if($this->settings->ldap_client_tls_cert && $this->settings->ldap_client_tls_key) {
// client-side TLS certificate support for LDAP (Google Secure LDAP)
putenv('LDAPTLS_CERT=storage/ldap_client_tls.cert');
putenv('LDAPTLS_KEY=storage/ldap_client_tls.key');
}
if($start_tls) {
if(!ldap_start_tls($lconn)) {
$this->error("WARNING: Unable to start TLS");
return false;
}
}
if(!$lconn) {
$this->error("WARNING: Failed to generate connection string - using: ".$ldap_url);
return false;
}
$net = ldap_set_option($lconn, LDAP_OPT_NETWORK_TIMEOUT, $this->option('timeout'));
$time = ldap_set_option($lconn, LDAP_OPT_TIMELIMIT, $this->option('timeout'));
if(!$net || !$time) {
$this->error("Unable to set timeouts!");
}
return $lconn;
}
public function test_anonymous_bind($ldap_url, $check_cert = true, $start_tls = false)
{
return $this->timed_boolean_execute(function () use ($ldap_url, $check_cert , $start_tls) {
try {
$lconn = $this->connect_to_ldap($ldap_url, $check_cert, $start_tls);
$this->info("gonna try to bind now, this can take a while if we mess it up");
$bind_results = ldap_bind($lconn);
$this->info("Bind results are: ".$bind_results." which translate into boolean: ".(bool)$bind_results);
return (bool)$bind_results;
} catch (Exception $e) {
$this->error("WARNING: Exception caught during bind - ".$e->getMessage());
return false;
}
});
}
public function test_authed_bind($ldap_url, $check_cert, $start_tls, $username, $password)
{
return $this->timed_boolean_execute(function () use ($ldap_url, $check_cert, $start_tls, $username, $password) {
try {
$lconn = $this->connect_to_ldap($ldap_url, $check_cert, $start_tls);
$bind_results = ldap_bind($lconn, $username, $password);
if(!$bind_results) {
$this->error("WARNING: Failed to bind to $ldap_url as $username");
return false;
} else {
$this->info("SUCCESS - Able to bind to $ldap_url as $username");
return (bool)$lconn;
}
} catch (Exception $e) {
$this->error("WARNING: Exception caught during Authed bind to $username - ".$e->getMessage());
return false;
}
});
}
public function test_informational_bind($ldap_url, $check_cert, $start_tls, $username, $password,$settings)
{
return $this->timed_boolean_execute(function () use ($ldap_url, $check_cert, $start_tls, $username, $password, $settings) {
try { // TODO - copypasta'ed from test_authed_bind
$conn = $this->connect_to_ldap($ldap_url, $check_cert, $start_tls);
$bind_results = ldap_bind($conn, $username, $password);
if(!$bind_results) {
$this->error("WARNING: Failed to bind to $ldap_url as $username");
return false;
}
$this->info("SUCCESS - Able to bind to $ldap_url as $username");
$result = ldap_read($conn, '', '(objectClass=*)'/* , ['supportedControl']*/);
$results = ldap_get_entries($conn, $result);
$cleaned_results = $this->ldap_results_cleaner($results);
$this->line(print_r($cleaned_results,true));
//okay, great - now how do we display those results? I have no idea.
// I don't see why this throws an Exception for Google LDAP, but I guess we ought to try and catch it?
$this->comment("I guess we're trying to do the ldap search here, but sometimes it takes too long?");
$this->debugout("Base DN is: ".$settings->ldap_basedn." and filter is: ".parenthesized_filter($settings->ldap_filter));
$search_results = ldap_search($conn, $settings->ldap_basedn, parenthesized_filter($settings->ldap_filter));
$this->info("Printing first 10 results: ");
for($i=0;$i<10;$i++) {
$this->info($search_results[$i]);
}
} catch (\Exception $e) {
$this->error("WARNING: Exception caught during Authed bind to $username - ".$e->getMessage());
return false;
}
});
}
/***********************************************
*
* This function executes $function - which is expected to be some kind of executable function -
* with a timeout set. It respects the timeout by forking execution and setting a strict timer
* for which to get back a SIGUSR1 or SIGUSR2 signal from the forked process.
*
***********************************************/
private function timed_boolean_execute($function)
{
if(!(function_exists('pcntl_sigtimedwait') && function_exists('posix_getpid') && function_exists('pcntl_fork') && function_exists('posix_kill') && function_exists('pcntl_wifsignaled'))) {
// POSIX functions needed for forking aren't present, just run the function inline (ignoring timeout)
$this->info('WARNING: Unable to execute POSIX fork() commands, timeout may not be respected');
return $function();
} else {
$parent_pid = posix_getpid();
$pid = pcntl_fork();
switch($pid) {
case 0:
//we're the 'child'
if($function()) {
//SUCCESS = SIGUSR1
posix_kill($parent_pid, SIGUSR1);
} else {
//FAILURE = SIGUSR2
posix_kill($parent_pid, SIGUSR2);
}
exit();
break; //yes I know we don't need it.
case -1:
//couldn't fork
$this->error("COULD NOT FORK - assuming failure");
return false;
break; //I still know that we don't need it
default:
//we remain the 'parent', $pid is the PID of the forked process.
$siginfo = [];
$exit_status = pcntl_sigtimedwait ([SIGUSR1, SIGUSR2], $siginfo, $this->option('timeout'));
if ($exit_status == SIGUSR1) {
return true;
} else {
posix_kill($pid, SIGKILL); //make sure we don't have processes hanging around that might try and send signals during later executions, confusing us
return false;
}
break; //Yeah I get it already, shush.
}
}
}
}