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< ? php //phpcs:ignore WordPress.Files.FileName.InvalidClassFileName
/**
* The password strength checker .
*
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* @ package automattic / jetpack
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*/
/**
* Checks passwords strength .
*/
class Jetpack_Password_Checker {
/**
* Minimum entropy bits a password should contain . 36 bits of entropy is considered
* to be a reasonable password , 28 stands for a weak one .
*
* @ const Integer
*/
const MINIMUM_BITS = 28 ;
/**
* Currently tested password .
*
* @ var String
*/
public $password = '' ;
/**
* Test results array .
*
* @ var Array
*/
public $test_results = '' ;
/**
* Current password score .
*
* @ var Integer
*/
public $score = 0 ;
/**
* Current multiplier affecting the score .
*
* @ var Integer
*/
public $multiplier = 4 ;
/**
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* A common password disallow list , which on match will immediately disqualify the password .
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*
* @ var Array
*/
public $common_passwords = array ();
/**
* Minimum password length setting .
*
* @ var Integer
*/
public $min_password_length = 6 ;
/**
* User defined strings that passwords need to be tested for a match against .
*
* @ var Array
*/
private $user_strings_to_test = array ();
/**
* The user object for whom the password is being tested .
*
* @ var WP_User
*/
protected $user ;
/**
* The user identifier for whom the password is being tested , used if there ' s no user object .
*
* @ var WP_User
*/
protected $user_id ;
/**
* Creates an instance of the password checker class for the specified user , or
* defaults to the currently logged in user .
*
* @ param Mixed $user can be an integer ID , or a WP_User object .
*/
public function __construct ( $user = null ) {
/**
* Filters Jetpack ' s password strength enforcement settings . You can supply your own passwords
* that should not be used for authenticating in addition to weak and easy to guess strings for
* each user . For example , you can add passwords from known password databases to avoid compromised
* password usage .
*
* @ since 7.2 . 0
*
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* @ param array $restricted_passwords strings that are forbidden for use as passwords .
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*/
$this -> common_passwords = apply_filters ( 'jetpack_password_checker_restricted_strings' , array () );
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if ( $user === null ) {
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$this -> user_id = get_current_user_id ();
} elseif ( is_object ( $user ) && isset ( $user -> ID ) ) {
// Existing user, using their ID.
$this -> user_id = $user -> ID ;
} elseif ( is_object ( $user ) ) {
// Newly created user, using existing data.
$this -> user = $user ;
$this -> user_id = 'new_user' ;
} else {
$this -> user_id = $user ;
}
$this -> min_password_length = apply_filters ( 'better_password_min_length' , $this -> min_password_length );
}
/**
* Run tests against a password .
*
* @ param String $password the tested string .
* @ param Boolean $required_only only test against required conditions , defaults to false .
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* @ return array $results an array containing failed and passed test results .
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*/
public function test ( $password , $required_only = false ) {
$this -> password = $password ;
$results = $this -> run_tests ( $this -> list_tests (), $required_only );
// If we've failed on the required tests, return now.
if ( ! empty ( $results [ 'failed' ] ) ) {
return array (
'passed' => false ,
'test_results' => $results ,
);
}
/**
* Filters Jetpack ' s password strength enforcement settings . You can modify the minimum
* entropy bits requirement using this filter .
*
* @ since 7.2 . 0
*
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* @ param array $minimum_entropy_bits minimum entropy bits requirement .
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*/
$bits = apply_filters ( 'jetpack_password_checker_minimum_entropy_bits' , self :: MINIMUM_BITS );
$entropy_bits = $this -> calculate_entropy_bits ( $this -> password );
// If we have failed the entropy bits test, run the regex tests so we can suggest improvements.
if ( $entropy_bits < $bits ) {
$results [ 'failed' ][ 'entropy_bits' ] = $entropy_bits ;
$results = array_merge (
$results ,
$this -> run_tests ( $this -> list_tests ( 'preg_match' ), false )
);
}
return ( array (
'passed' => empty ( $results [ 'failed' ] ),
'test_results' => $results ,
) );
}
/**
* Run the tests using the currently set up object values .
*
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* @ param array $tests tests to run .
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* @ param Boolean $required_only whether to run only required tests .
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* @ return array test results .
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*/
protected function run_tests ( $tests , $required_only = false ) {
$results = array (
'passed' => array (),
'failed' => array (),
);
foreach ( $tests as $test_type => $section_tests ) {
foreach ( $section_tests as $test_name => $test_data ) {
// Skip non-required tests if required_only param is set.
if ( $required_only && ! $test_data [ 'required' ] ) {
continue ;
}
$test_function = 'test_' . $test_type ;
$result = call_user_func ( array ( $this , $test_function ), $test_data );
if ( $result ) {
$results [ 'passed' ][] = array ( 'test_name' => $test_name );
} else {
$results [ 'failed' ][] = array (
'test_name' => $test_name ,
'explanation' => $test_data [ 'error' ],
);
if ( isset ( $test_data [ 'fail_immediately' ] ) ) {
return $results ;
}
}
}
}
return $results ;
}
/**
* Returns a list of tests that need to be run on password strings .
*
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* @ param array $sections only return specific sections with the passed keys , defaults to all .
* @ return array test descriptions .
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*/
protected function list_tests ( $sections = false ) {
// Note: these should be in order of priority.
$tests = array (
'preg_match' => array (
'no_backslashes' => array (
'pattern' => '^[^\\\\]*$' ,
'error' => __ ( 'Passwords may not contain the character "\".' , 'jetpack' ),
'required' => true ,
'fail_immediately' => true ,
),
'minimum_length' => array (
'pattern' => '^.{' . $this -> min_password_length . ',}' ,
/* translators: %d is a number of characters in the password. */
'error' => sprintf ( __ ( 'Password must be at least %d characters.' , 'jetpack' ), $this -> min_password_length ),
'required' => true ,
'fail_immediately' => true ,
),
'has_mixed_case' => array (
'pattern' => '([a-z].*?[A-Z]|[A-Z].*?[a-z])' ,
'error' => __ ( 'This password is too easy to guess: you can improve it by adding additional uppercase letters, lowercase letters, or numbers.' , 'jetpack' ),
'trim' => true ,
'required' => false ,
),
'has_digit' => array (
'pattern' => '\d' ,
'error' => __ ( 'This password is too easy to guess: you can improve it by mixing both letters and numbers.' , 'jetpack' ),
'trim' => false ,
'required' => false ,
),
'has_special_char' => array (
'pattern' => '[^a-zA-Z\d]' ,
'error' => __ ( 'This password is too easy to guess: you can improve it by including special characters such as !#=?*&.' , 'jetpack' ),
'required' => false ,
),
),
'compare_to_list' => array (
'not_a_common_password' => array (
'list_callback' => 'get_common_passwords' ,
'compare_callback' => 'negative_in_array' ,
'error' => __ ( 'This is a very common password. Choose something that will be harder for others to guess.' , 'jetpack' ),
'required' => true ,
),
'not_same_as_other_user_data' => array (
'list_callback' => 'get_other_user_data' ,
'compare_callback' => 'test_not_same_as_other_user_data' ,
'error' => __ ( 'Your password is too weak: Looks like you\'re including easy to guess information about yourself. Try something a little more unique.' , 'jetpack' ),
'required' => true ,
),
),
);
/**
* Filters Jetpack ' s password strength enforcement settings . You can determine the tests run
* and their order based on whatever criteria you wish to specify .
*
* @ since 7.2 . 0
*
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* @ param array $minimum_entropy_bits minimum entropy bits requirement .
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*/
$tests = apply_filters ( 'jetpack_password_checker_tests' , $tests );
if ( ! $sections ) {
return $tests ;
}
$sections = ( array ) $sections ;
return array_intersect_key ( $tests , array_flip ( $sections ) );
}
/**
* Provides the regular expression tester functionality .
*
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* @ param array $test_data the current test data .
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* @ return Boolean does the test pass ?
*/
protected function test_preg_match ( $test_data ) {
$password = stripslashes ( $this -> password );
if ( isset ( $test_data [ 'trim' ] ) ) {
$password = substr ( $password , 1 , - 1 );
}
if ( ! preg_match ( '/' . $test_data [ 'pattern' ] . '/u' , $password ) ) {
return false ;
}
return true ;
}
/**
* Provides the comparison tester functionality .
*
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* @ param array $test_data the current test data .
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* @ return Boolean does the test pass ?
*/
protected function test_compare_to_list ( $test_data ) {
$list_callback = $test_data [ 'list_callback' ];
$compare_callback = $test_data [ 'compare_callback' ];
if (
! is_callable ( array ( $this , $list_callback ) )
|| ! is_callable ( array ( $this , $compare_callback ) )
) {
return false ;
}
$list = call_user_func ( array ( $this , $list_callback ) );
if ( empty ( $list ) ) {
return true ;
}
return call_user_func ( array ( $this , $compare_callback ), $this -> password , $list );
}
/**
* Getter for the common password list .
*
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* @ return array common passwords .
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*/
protected function get_common_passwords () {
return $this -> common_passwords ;
}
/**
* Returns the widely known user data that can not be used in the password to avoid
* predictable strings .
*
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* @ return array user data .
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*/
protected function get_other_user_data () {
if ( ! isset ( $this -> user ) ) {
$user_data = get_userdata ( $this -> user_id );
$first_name = get_user_meta ( $user_data -> ID , 'first_name' , true );
$last_name = get_user_meta ( $user_data -> ID , 'last_name' , true );
$nickname = get_user_meta ( $user_data -> ID , 'nickname' , true );
$this -> add_user_strings_to_test ( $nickname );
$this -> add_user_strings_to_test ( $user_data -> user_nicename );
$this -> add_user_strings_to_test ( $user_data -> display_name );
} else {
$user_data = $this -> user ;
$first_name = $user_data -> first_name ;
$last_name = $user_data -> last_name ;
}
$email_username = substr ( $user_data -> user_email , 0 , strpos ( $user_data -> user_email , '@' ) );
$this -> add_user_strings_to_test ( $user_data -> user_email );
$this -> add_user_strings_to_test ( $email_username , '.' );
$this -> add_user_strings_to_test ( $first_name );
$this -> add_user_strings_to_test ( $last_name );
return $this -> user_strings_to_test ;
}
/**
* Compare the password for matches with known user data .
*
* @ param String $password the string to be tested .
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* @ param array $strings_to_test known user data .
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* @ return Boolean does the test pass ?
*/
protected function test_not_same_as_other_user_data ( $password , $strings_to_test ) {
$password_lowercase = strtolower ( $password );
foreach ( array_unique ( $strings_to_test ) as $string ) {
if ( empty ( $string ) ) {
continue ;
}
$string = strtolower ( $string );
$string_reversed = strrev ( $string );
if ( $password_lowercase === $string || $password_lowercase === $string_reversed ) {
return false ;
}
// Also check for the string or reversed string with any numbers just stuck to the end to catch things like bob123 as passwords.
if (
preg_match ( '/^' . preg_quote ( $string , '/' ) . '\d+$/' , $password_lowercase )
|| preg_match ( '/^' . preg_quote ( $string_reversed , '/' ) . '\d+$/' , $password_lowercase )
) {
return false ;
}
}
return true ;
}
/**
* A shorthand for the not in array construct .
*
* @ param Mixed $needle the needle .
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* @ param array $haystack the haystack .
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* @ return bool is the needle not in the haystack ?
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*/
protected function negative_in_array ( $needle , $haystack ) {
if ( in_array ( $needle , $haystack , true ) ) {
return false ;
}
return true ;
}
/**
* A helper function used to break a single string into its constituents so
* that both the full string and its constituents and any variants thereof
* can be tested against the password .
*
* @ param String $string the string to be broken down .
* @ param String $explode_delimiter delimiter .
* @ return NULL | Array array of fragments , or NULL on empty string .
*/
protected function add_user_strings_to_test ( $string , $explode_delimiter = ' ' ) {
// Don't check against empty strings.
if ( empty ( $string ) ) {
return ;
}
$strings = explode ( $explode_delimiter , $string );
// Remove any non alpha numeric characters from the strings to check against.
foreach ( $strings as $key => $_string ) {
$strings [ $key ] = preg_replace ( '/[^a-zA-Z0-9]/' , '' , $_string );
}
// Check the original too.
$strings [] = $string ;
// Check the original minus non alpha numeric characters.
$strings [] = preg_replace ( '/[^a-zA-Z0-9]/' , '' , $string );
// Remove any empty strings.
$strings = array_filter ( $strings );
$this -> user_strings_to_test = array_merge ( $this -> user_strings_to_test , $strings );
}
/**
* Return a character set size that is used in the string .
*
* @ param String $password the password .
* @ return Integer number of different character sets in use .
*/
protected function get_charset_size ( $password ) {
$size = 0 ;
// Lowercase a-z.
if ( preg_match ( '/[a-z]/' , $password ) ) {
$size += 26 ;
}
// Uppercase A-Z.
if ( preg_match ( '/[A-Z]/' , substr ( $password , 1 , - 1 ) ) ) {
$size += 26 ;
}
// Digits.
if ( preg_match ( '/\d/' , substr ( $password , 1 , - 1 ) ) ) {
$size += 10 ;
}
// Over digits symbols.
if ( preg_match ( '/[!|@|#|$|%|^|&|*|(|)]/' , $password ) ) {
$size += 10 ;
}
// Other symbols.
if ( preg_match ( '#[`|~|-|_|=|+|\[|{|\]|}|\\|\|;:\'",<\.>/\?]#' , $password ) ) {
$size += 20 ;
}
// Spaces.
if ( strpos ( $password , ' ' ) ) {
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++ $size ;
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}
return $size ;
}
/**
* Shorthand for getting a character index .
*
* @ param String $char character .
* @ return Integer the character code .
*/
protected function get_char_index ( $char ) {
$char = strtolower ( $char [ 0 ] );
if ( $char < 'a' || $char > 'z' ) {
return 0 ;
} else {
return ord ( $char [ 0 ] ) - ord ( 'a' ) + 1 ;
}
}
/**
* This is the password strength calculation algorithm , based on the formula H = L ( logN / log2 ) .
*
* H = Entropy
* L = String length ( the for iterator )
* N = Our charset size , via get_charset_size ()
*
* @ see https :// en . wikipedia . org / wiki / Password_strength #Random_passwords
*
* On top of the base formula , we ' re also multiplying the bits of entropy for every char
* by 1 - ( the probabily of it following the previous char )
* i . e .: the probablity of U following Q is ~ 0.84 . If our password contains this pair of characters ,
* the u char will only add ( 0.16 ^ 2 * charset_score ) to our total of entropy bits .
*
* @ param String $password the password .
*/
protected function calculate_entropy_bits ( $password ) {
$bits = 0 ;
$charset_score = log ( $this -> get_charset_size ( $password ) ) / log ( 2 );
$aidx = $this -> get_char_index ( $password [ 0 ] );
$length = strlen ( $password );
for ( $b = 1 ; $b < $length ; $b ++ ) {
$bidx = $this -> get_char_index ( $password [ $b ] );
// 27 = number of chars in the index (a-z,' ').
$c = 1.0 - $this -> frequency_table [ $aidx * 27 + $bidx ];
$bits += $charset_score * $c * $c ;
// Move on to next pair.
$aidx = $bidx ;
}
return $bits ;
}
/**
* A frequency table of character pairs , starting with ' ' then ' a' , ' b' [ ... ] , 'a ' , 'aa' etc .
*
* @ see http :// rumkin . com / tools / password / passchk . php
* @ var Array
*/
public $frequency_table = array (
0.23653710453418866 ,
0.04577693541332556 ,
0.03449832337075375 ,
0.042918209651552706 ,
0.037390873305146524 ,
0.028509112115468728 ,
0.02350896632162123 ,
0.022188657238664526 ,
0.028429800262428927 ,
0.04357019973757107 ,
0.00913602565971716 ,
0.03223093745443942 ,
0.02235311269864412 ,
0.04438081352966905 ,
0.04512377897652719 ,
0.020055401662049863 ,
0.055903192885260244 ,
0.0024388394809739026 ,
0.035207464644991984 ,
0.07355941099285611 ,
0.036905671380667734 ,
0.026134421927394666 ,
0.023787724158040528 ,
0.011352092141711621 ,
0.0032354570637119114 ,
0.005986878553725033 ,
0.008861933226417843 ,
0.11511532293337222 ,
0.027556203528211108 ,
0.024331243621519172 ,
0.039266365359381834 ,
0.031599941682461 ,
0.014403265782183991 ,
0.015480973902901297 ,
0.027770812071730572 ,
0.00942761335471643 ,
0.039872867764980315 ,
0.0078122175244204695 ,
0.02808456043154979 ,
0.08429100451960927 ,
0.04688963405744277 ,
0.13831170724595424 ,
0.002540311998833649 ,
0.025211838460416972 ,
0.001543082081936142 ,
0.09519638431258201 ,
0.061845750109345385 ,
0.08907071001603732 ,
0.02137571074500656 ,
0.027093162268552268 ,
0.005521504592506197 ,
0.003023181221752442 ,
0.007086747339262283 ,
0.010262720513194342 ,
0.08785070710016038 ,
0.14617757690625455 ,
0.03417291150313457 ,
0.0059635515381250915 ,
0.006146668610584633 ,
0.195202799241872 ,
0.002774748505613063 ,
0.004715556203528212 ,
0.0044776206444088066 ,
0.11205481848665985 ,
0.005654468581425864 ,
0.0028820527773727946 ,
0.07383000437381543 ,
0.005516839189386207 ,
0.006496573844583759 ,
0.09843067502551392 ,
0.0027140982650532145 ,
0.0006893133109782768 ,
0.08425368129464937 ,
0.021325557661466685 ,
0.006493074792243767 ,
0.07023414491908442 ,
0.002077270739174807 ,
0.0024633328473538415 ,
0.0007744569179180639 ,
0.015413325557661468 ,
0.0011990086018370024 ,
0.13162851727657093 ,
0.10115993585070711 ,
0.0026989357049132527 ,
0.03319317684793702 ,
0.002946202070272634 ,
0.0783216212275842 ,
0.0018358361277154103 ,
0.00258813238081353 ,
0.2141688292754046 ,
0.09853681294649366 ,
0.0032482869222918796 ,
0.04359352675317102 ,
0.01993526753171016 ,
0.0036880011663507797 ,
0.008011663507799971 ,
0.12014696019827964 ,
0.0029846916460125384 ,
0.0017553579238956116 ,
0.029470185158186325 ,
0.010413179763813967 ,
0.030699518880303252 ,
0.03508499781309229 ,
0.002021285901734947 ,
0.0010613792097973467 ,
0.0005295232541186761 ,
0.009677212421635807 ,
0.010585799679253535 ,
0.17101734946785244 ,
0.07968625164018078 ,
0.007839043592360402 ,
0.005438693687126403 ,
0.0183606939787141 ,
0.2732701559994168 ,
0.004953491762647616 ,
0.007259367254701851 ,
0.008104971570199739 ,
0.13274588132380813 ,
0.004210526315789474 ,
0.004997813092287506 ,
0.017006560723137484 ,
0.007442484327161393 ,
0.016789619478058026 ,
0.08477737279486806 ,
0.005106283714827234 ,
0.0005026971861787433 ,
0.04040355736987899 ,
0.037535500801866156 ,
0.00885960052485785 ,
0.0336410555474559 ,
0.007066919376002332 ,
0.005344219273946639 ,
0.0006333284735384167 ,
0.010684939495553289 ,
0.0063064586674442345 ,
0.15386849394955532 ,
0.015049424114302375 ,
0.012162705933809595 ,
0.020425134859308938 ,
0.037366379938766583 ,
0.02157165767604607 ,
0.009373961218836564 ,
0.0173214754337367 ,
0.009616562181075958 ,
0.029522670943286193 ,
0.010154249890654615 ,
0.018600962239393497 ,
0.06362210234728094 ,
0.03157078291296107 ,
0.151603440734801 ,
0.0062329785683044175 ,
0.014775331681003062 ,
0.0020854351946347867 ,
0.1826342032366234 ,
0.0878017203674005 ,
0.054190989940224525 ,
0.010329202507654177 ,
0.012763376585508092 ,
0.0064872430383437815 ,
0.006381105117364048 ,
0.005388540603586529 ,
0.0090800408222773 ,
0.09611196967487973 ,
0.09940691062837148 ,
0.01033969966467415 ,
0.004034407348009914 ,
0.008826942703017933 ,
0.11474675608689314 ,
0.07132584924916169 ,
0.012388977985129028 ,
0.005435194634786413 ,
0.1417174515235457 ,
0.0037066627788307337 ,
0.0045802595130485495 ,
0.060800699810468 ,
0.005341886572386646 ,
0.005683627350925791 ,
0.12434932205860913 ,
0.004596588423968508 ,
0.0007534626038781163 ,
0.07107041842834232 ,
0.022361277154104096 ,
0.04784720804782038 ,
0.06277533168100306 ,
0.003441901151771395 ,
0.005828254847645429 ,
0.0009669047966175828 ,
0.009470768333576322 ,
0.002077270739174807 ,
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