asn1_alpha_id_valid() define('OID_DOT_FORBIDDEN', 0); define('OID_DOT_OPTIONAL', 1); define('OID_DOT_REQUIRED', 2); /** * Checks if an OID has a valid dot notation. * @author Daniel Marschall, ViaThinkSoft * @version 2014-12-09 * @param string $oid
* An OID in dot notation. * @param boolean $allow_leading_zeroes
* true of leading zeroes are allowed or not. * @param boolean $allow_leading_dot
* true of leading dots are allowed or not. * @return boolean true if the dot notation is valid. **/ function oid_valid_dotnotation($oid, $allow_leading_zeroes=true, $allow_leading_dot=false, $min_len=0) { $regex = oid_validation_regex($allow_leading_zeroes, $allow_leading_dot, $min_len); $m = array(); return preg_match($regex, $oid, $m) ? true : false; } /** * Returns a full regular expression to validate an OID in dot-notation * @author Daniel Marschall, ViaThinkSoft * @version 2014-12-09 * @param boolean $allow_leading_zeroes
* true of leading zeroes are allowed or not. * @param boolean $allow_leading_dot
* true of leading dots are allowed or not. * @return string The regular expression **/ function oid_validation_regex($allow_leading_zeroes=true, $allow_leading_dot=false, $min_len=0) { $leading_dot_policy = $allow_leading_dot ? OID_DOT_OPTIONAL : OID_DOT_FORBIDDEN; $part_regex = oid_part_regex($min_len, $allow_leading_zeroes, $leading_dot_policy); return '@^'.$part_regex.'$@'; } /** * Returns a partial regular expression which matches valid OIDs in dot notation. * It can be inserted into regular expressions. * @author Daniel Marschall, ViaThinkSoft * @version 2014-12-09 * @param int $min_len
* 0="." and greater will be recognized, but not ""
* 1=".2" and greater will be recognized
* 2=".2.999" and greater will be recognized (default)
* etc. * @param boolean $allow_leading_zeroes
* true: ".2.0999" will be recognized
* false: ".2.0999" won't be recognized (default) * @param int $leading_dot_policy
* 0 (OID_DOT_FORBIDDEN): forbidden
* 1 (OID_DOT_OPTIONAL) : optional (default)
* 2 (OID_DOT_REQUIRED) : enforced * @return string|false A regular expression which matches OIDs in dot notation **/ function oid_part_regex($min_len=2, $allow_leading_zeroes=false, $leading_dot_policy=OID_DOT_OPTIONAL) { switch ($leading_dot_policy) { case 0: // forbidden $lead_dot = ''; break; case 1: // optional $lead_dot = '\\.{0,1}'; break; case 2: // enforced $lead_dot = '\\.'; break; default: assert(false); return false; } $lead_zero = $allow_leading_zeroes ? '0*' : ''; $zero_till_thirtynine = '(([0-9])|([1-3][0-9]))'; // second arc is limited to 0..39 if root arc is 0..1 $singledot_option = ($min_len == 0) && ($leading_dot_policy != OID_DOT_FORBIDDEN) ? '|\\.' : ''; $only_root_option = ($min_len <= 1) ? '|('.$lead_dot.$lead_zero.'[0-2])' : ''; $regex = ' ( ( ( ('.$lead_dot.$lead_zero.'[0-1]) \\.'.$lead_zero.$zero_till_thirtynine.' (\\.'.$lead_zero.'(0|[1-9][0-9]*)){'.max(0, $min_len-2).',} )|( ('.$lead_dot.$lead_zero.'[2]) (\\.'.$lead_zero.'(0|[1-9][0-9]*)){'.max(0, $min_len-1).',} ) '.$only_root_option.' '.$singledot_option.' ) )'; // Remove the indentations which are used to maintain this large regular expression in a human friendly way $regex = str_replace("\n", '', $regex); $regex = str_replace("\r", '', $regex); $regex = str_replace("\t", '', $regex); $regex = str_replace(' ', '', $regex); return $regex; } /** * Searches all OIDs in $text and outputs them as array. * @author Daniel Marschall, ViaThinkSoft * @version 2014-12-09 * @param string $text
* The text to be parsed * @param int $min_len
* 0="." and greater will be recognized, but not ""
* 1=".2" and greater will be recognized
* 2=".2.999" and greater will be recognized (default)
* etc. * @param boolean $allow_leading_zeroes
* true: ".2.0999" will be recognized
* false: ".2.0999" won't be recognized (default) * @param int $leading_dot_policy
* 0 (OID_DOT_FORBIDDEN): forbidden
* 1 (OID_DOT_OPTIONAL) : optional (default)
* 2 (OID_DOT_REQUIRED) : enforced * @param boolean $requires_whitespace_delimiters
* true: "2.999" will be recognized, as well as " 2.999 " (default)
* false: "2.999!" will be reconigzed, as well as "2.999.c" (this might be used in in documentations with templates) * @return string[] An array of OIDs in dot notation **/ function parse_oids($text, $min_len=2, $allow_leading_zeroes=false, $leading_dot_policy=OID_DOT_OPTIONAL, $requires_whitespace_delimiters=true) { $regex = oid_detection_regex($min_len, $allow_leading_zeroes, $leading_dot_policy, $requires_whitespace_delimiters); $matches = array(); preg_match_all($regex, $text, $matches); return $matches[1]; } /** * Returns a full regular expression for detecting OIDs in dot notation inside a text. * @author Daniel Marschall, ViaThinkSoft * @version 2014-12-09 * @param int $min_len
* 0="." and greater will be recognized, but not ""
* 1=".2" and greater will be recognized
* 2=".2.999" and greater will be recognized (default)
* etc. * @param boolean $allow_leading_zeroes
* true: ".2.0999" will be recognized
* false: ".2.0999" won't be recognized (default) * @param int $leading_dot_policy
* 0 (OID_DOT_FORBIDDEN): forbidden
* 1 (OID_DOT_OPTIONAL) : optional (default)
* 2 (OID_DOT_REQUIRED) : enforced * @param boolean $requires_whitespace_delimiters
* true: "2.999" will be recognized, as well as " 2.999 " (default)
* false: "2.999!" will be reconigzed, as well as "2.999.c" (this might be used in in documentations with templates) * @return string The regular expression **/ function oid_detection_regex($min_len=2, $allow_leading_zeroes=false, $leading_dot_policy=OID_DOT_OPTIONAL, $requires_whitespace_delimiters=true) { if ($requires_whitespace_delimiters) { // A fully qualified regular expression which can be used by preg_match() $begin_condition = '(?<=^|\\s)'; $end_condition = '(?=\\s|$)'; } else { // A partial expression which can be used inside another regular expression $begin_condition = '(? * Leading dots and leading zeroes are tolerated. * @author Daniel Marschall, ViaThinkSoft * @version 2014-12-16 * @param string $oid
* An OID in dot notation. * @return string|false The parent OID in dot notation. **/ function oid_up($oid) { $oid = sanitizeOID($oid, 'auto'); if ($oid === false) return false; $p = strrpos($oid, '.'); if ($p === false) return $oid; if ($p == 0) return '.'; return substr($oid, 0, $p); } /** * Outputs the depth of an OID. * @author Daniel Marschall, ViaThinkSoft * @version 2014-12-09 * @param string $oid An OID in dot notation (with or without leading dot) * @return int The depth of the OID, e.g. 2.999 and .2.999 has the length 2. **/ function oid_len($oid) { if ($oid == '') return 0; if (substr($oid,0,1) == '.') $oid = substr($oid, 1); return substr_count($oid, '.')+1; } function oid_depth($oid) { return oid_len($oid); } /** * Lists all parents of an OID. * This function tolerates leading dots. The parent of '.' stays '.'. * The OID will not be checked for validity! * @author Daniel Marschall, ViaThinkSoft * @version 2014-12-17 * @param string $oid
* An OID in dot notation. * @return string[] An array with all parent OIDs. **/ function oid_parents($oid) { $parents = array(); while (oid_len($oid) > 1) { $oid = oid_up($oid); $parents[] = $oid; } if (substr($oid, 0, 1) == '.') $parents[] = '.'; return $parents; } /* assert(oid_parents('.1.2.999') == array('.1.2', '.1', '.')); assert(oid_parents('1.2.999') == array('1.2', '1')); assert(oid_parents('.') == array('.')); assert(oid_parents('') == array()); */ /** * Sorts an array containing OIDs in dot notation. * @author Daniel Marschall, ViaThinkSoft * @version 2014-12-09 * @param string[] $ary
* An array of OIDs in dot notation.
* This array will be changed by this method. * @param boolean $output_with_leading_dot
* true: The array will be normalized to OIDs with a leading dot. * false: The array will be normalized to OIDs without a leading dot. (default) **/ function oidSort(&$ary, $output_with_leading_dot=false) { $out = array(); $none = $output_with_leading_dot ? '.' : ''; $d = array(); $oid = null; foreach ($ary as &$oid) { if (($oid == '') || ($oid == '.')) { $out[] = $none; } else { $oid = sanitizeOID($oid, 'auto'); // strike leading zeroes $bry = explode('.', $oid, 2); $firstarc = $bry[0]; $rest = (isset($bry[1])) ? $bry[1] : ''; $d[$firstarc][] = $rest; } } unset($oid); ksort($d); $data = null; foreach ($d as $firstarc => &$data) { oidSort($data); foreach ($data as &$rest) { $out[] = ($output_with_leading_dot ? '.' : '')."$firstarc" . (($rest != $none) ? ".$rest" : ''); } } unset($data); $ary = $out; } /** * Checks if two OIDs in dot-notation are equal * @author Daniel Marschall, ViaThinkSoft * @version 2020-05-27 * @param string $oidA
* First OID * @param string $oidB
* Second OID * @return boolean|null True if the OIDs are equal, null if one of the OIDs are invalid **/ function oid_dotnotation_equal($oidA, $oidB) { $oidA = sanitizeOID($oidA, false); if ($oidA === false) return null; $oidB = sanitizeOID($oidB, false); if ($oidB === false) return null; return $oidA === $oidB; } /** * Removes leading zeroes from an OID in dot notation. * @author Daniel Marschall, ViaThinkSoft * @version 2015-08-17 * @param string $oid
* An OID in dot notation. * @param mixed $leading_dot
* true: The OID is valid, if it contains a leading dot.
* false (default): The OID is valid, if it does not contain a leading dot. * 'auto: Allow both * @return string|false The OID without leading dots, or false if the OID is syntactically wrong. **/ function sanitizeOID($oid, $leading_dot=false) { static $oid_sanitize_cache = array(); if ($leading_dot) $leading_dot = substr($oid,0,1) == '.'; // We are using a cache, since this function is used very often by OIDplus global $oid_sanitize_cache; $v = ($leading_dot ? 'T' : 'F').$oid; if (isset($oid_sanitize_cache[$v])) return $oid_sanitize_cache[$v]; if ($leading_dot) { if ($oid == '.') return ''; } else { if ($oid == '') return ''; } $out = ''; $ary = explode('.', $oid); foreach ($ary as $n => &$a) { if (($leading_dot) && ($n == 0)) { if ($a != '') return false; continue; } if (!preg_match('@^(\\d+)$@', $a, $m)) return false; // does contain something other than digits // strike leading zeroes $a = preg_replace("@^0+@", '', $a); if ($a == '') $a = 0; if (($leading_dot) || ($n != 0)) $out .= '.'; $out .= $a; } unset($a); unset($ary); $oid_sanitize_cache[$v] = $out; return $out; } /** * Shows the top arc of an OID. * This function tolerates leading dots. * @author Daniel Marschall, ViaThinkSoft * @version 2014-12-16 * @param string $oid
* An OID in dot notation. * @return string|false The top arc of the OID or empty string if it is already the root ('.') **/ function oid_toparc($oid) { $leadingdot = substr($oid,0,1) == '.'; $oid = sanitizeOID($oid, $leadingdot); if ($oid === false) return false; if (!$leadingdot) $oid = '.'.$oid; $p = strrpos($oid, '.'); if ($p === false) return false; $r = substr($oid, $p+1); if ($leadingdot) { # if ($r == '') return '.'; return $r; } else { return substr($r, 1); } } /** * Calculates the distance between two OIDs. * This function tolerates leading dots and leading zeroes. * @author Daniel Marschall, ViaThinkSoft * @version 2014-12-20 * @param string $a
* An OID. * @param string $b
* An OID. * @return int|false false if both OIDs do not have a child-parent or parent-child relation, e.g. oid_distance('2.999.1.2.3', '2.999.4.5') = false, or if one of the OIDs is syntactially invalid
* >0 if $a is more specific than $b , e.g. oid_distance('2.999.1.2', '2.999') = 2
* <0 if $a is more common than $b , e.g. oid_distance('2.999', '2.999.1.2') = -2 **/ function oid_distance($a, $b) { if (substr($a,0,1) == '.') $a = substr($a,1); if (substr($b,0,1) == '.') $b = substr($b,1); $a = sanitizeOID($a, false); if ($a === false) return false; $b = sanitizeOID($b, false); if ($b === false) return false; $ary = explode('.', $a); $bry = explode('.', $b); $min_len = min(count($ary), count($bry)); for ($i=0; $i<$min_len; $i++) { if ($ary[$i] != $bry[$i]) return false; } return count($ary) - count($bry); } /* assert(oid_distance('2.999.1.2.3', '2.999.4.5') === false); assert(oid_distance('2.999.1.2', '2.999') === 2); assert(oid_distance('2.999', '2.999.1.2') === -2); */ /** * Adds a leading dot to an OID. * Leading zeroes are tolerated. * @author Daniel Marschall, ViaThinkSoft * @version 2014-12-20 * @param string $oid
* An OID. * @return string|false The OID with a leading dot or false if the OID is syntactially wrong. **/ function oid_add_leading_dot($oid) { $oid = sanitizeOID($oid, 'auto'); if ($oid === false) return false; if (substr($oid,0,1) != '.') $oid = '.'.$oid; return $oid; } /** * Removes a leading dot to an OID. * Leading zeroes are tolerated. * @author Daniel Marschall, ViaThinkSoft * @version 2014-12-20 * @param string $oid
* An OID. * @return string|false The OID without a leading dot or false if the OID is syntactially wrong. **/ function oid_remove_leading_dot($oid) { $oid = sanitizeOID($oid, 'auto'); if ($oid === false) return false; if (substr($oid,0,1) == '.') $oid = substr($oid, 1); return $oid; } /** * Find the common ancestor of two or more OIDs * @author Daniel Marschall, ViaThinkSoft * @version 2020-05-27 * @param string[] $oids
* An array of multiple OIDs, e.g. 2.999.1 and 2.999.2.3.4 * @return string|false The common ancestor, e.g. 2.999, or false if there is no common ancestor. **/ function oid_common_ancestor(array $oids) { $shared = array(); if (!is_array($oids)) return false; if (count($oids) === 0) return false; foreach ($oids as &$oid) { $oid = sanitizeOID($oid, false); if ($oid === false) return false; $oid = explode('.', $oid); } $max_ok = strlen($oids[0]); for ($i=1; $i= '0') && ($c <= '9') && (!$firstchar)) return true; if (($c >= 'A') && ($c <= 'Z')) return true; if (($c >= 'a') && ($c <= 'z')) return true; $v = mb_ord($c, 'UTF-8'); if (($v >= 0x000000A0) && ($v <= 0x0000DFFE)) return true; if (($v >= 0x0000F900) && ($v <= 0x0000FDCF)) return true; if (($v >= 0x0000FDF0) && ($v <= 0x0000FFEF)) return true; if (($v >= 0x00010000) && ($v <= 0x0001FFFD)) return true; if (($v >= 0x00020000) && ($v <= 0x0002FFFD)) return true; if (($v >= 0x00030000) && ($v <= 0x0003FFFD)) return true; if (($v >= 0x00040000) && ($v <= 0x0004FFFD)) return true; if (($v >= 0x00050000) && ($v <= 0x0005FFFD)) return true; if (($v >= 0x00060000) && ($v <= 0x0006FFFD)) return true; if (($v >= 0x00070000) && ($v <= 0x0007FFFD)) return true; if (($v >= 0x00080000) && ($v <= 0x0008FFFD)) return true; if (($v >= 0x00090000) && ($v <= 0x0009FFFD)) return true; if (($v >= 0x000A0000) && ($v <= 0x000AFFFD)) return true; if (($v >= 0x000B0000) && ($v <= 0x000BFFFD)) return true; if (($v >= 0x000C0000) && ($v <= 0x000CFFFD)) return true; if (($v >= 0x000D0000) && ($v <= 0x000DFFFD)) return true; if (($v >= 0x000E1000) && ($v <= 0x000EFFFD)) return true; // Note: Rec. ITU-T X.660, clause 7.5.3 would also forbid ranges which are marked in ISO/IEC 10646 as "(This position shall not be used)" // But tool implementers should be tolerate them, since these limitations can be removed in future. return false; } function iri_arc_valid($arc, $allow_numeric=true) { if ($arc == '') return false; $m = array(); if ($allow_numeric && preg_match('@^(\\d+)$@', $arc, $m)) return true; # numeric arc if (mb_substr($arc, 2, 2) == '--') return false; // see Rec. ITU-T X.660, clause 7.5.4 $array = array(); preg_match_all('/./u', $arc, $array, PREG_SET_ORDER); $len = count($array); foreach ($array as $i => $char) { if (!iri_char_valid($char[0], $i==0, $i==$len-1)) return false; } return true; } /** * Checks if an IRI identifier is valid or not. * @author Daniel Marschall, ViaThinkSoft * @version 2014-12-17 * @param string $iri
* An OID in OID-IRI notation, e.g. /Example/test * @return boolean true if the IRI identifier is valid. **/ function iri_valid($iri) { if ($iri == '/') return true; // OK? if (substr($iri, 0, 1) != '/') return false; $ary = explode('/', $iri); array_shift($ary); foreach ($ary as $a) { if (!iri_arc_valid($a)) return false; } return true; } /* assert(iri_arc_valid('ABCDEF')); assert(!iri_arc_valid('-ABCDEF')); assert(!iri_arc_valid('ABCDEF-')); assert(!iri_arc_valid(' ABCDEF')); assert(!iri_arc_valid('2 ABCDEF')); assert(!iri_arc_valid('')); assert(!iri_valid('')); assert(iri_valid('/')); assert(iri_valid('/hello/world')); assert(iri_valid('/123/world')); assert(!iri_valid('/hello/0world')); assert(!iri_valid('/hello/xo--test')); assert(!iri_valid('/hello/-super-/sd')); */ /** * Returns an associative array in the form 'ASN.1' => '/2/1' . * @author Daniel Marschall, ViaThinkSoft * @version 2018-01-05 * @see http://itu.int/go/X660 * @return array An associative array in the form 'ASN.1' => '/2/1' . **/ function iri_get_long_arcs() { $iri_long_arcs = array(); $iri_long_arcs['ASN.1'] = '/2/1'; $iri_long_arcs['Country'] = '/2/16'; $iri_long_arcs['International-Organizations'] = '/2/23'; $iri_long_arcs['UUID'] = '/2/25'; $iri_long_arcs['Tag-Based'] = '/2/27'; $iri_long_arcs['BIP'] = '/2/41'; $iri_long_arcs['Telebiometrics'] = '/2/42'; $iri_long_arcs['Cybersecurity'] = '/2/48'; $iri_long_arcs['Alerting'] = '/2/49'; $iri_long_arcs['OIDResolutionSystem'] = '/2/50'; $iri_long_arcs['GS1'] = '/2/51'; $iri_long_arcs['Example'] = '/2/999'; // English $iri_long_arcs['Exemple'] = '/2/999'; // French $iri_long_arcs['Ejemplo'] = '/2/999'; // Spanish $iri_long_arcs["\u{0627}\u{0644}\u{0645}\u{062B}\u{0627}\u{0644}"] = '/2/999'; // Arabic $iri_long_arcs["\u{8303}\u{4F8B}"] = '/2/999'; // Chinese $iri_long_arcs["\u{041F}\u{0440}\u{0438}\u{043C}\u{0435}\u{0440}"] = '/2/999'; // Russian $iri_long_arcs["\u{C608}\u{C81C}"] = '/2/999'; // Korean $iri_long_arcs["\u{4F8B}"] = '/2/999'; // Japanese $iri_long_arcs['Beispiel'] = '/2/999'; // German return $iri_long_arcs; } /** * Tries to shorten/simplify an IRI by applying "long arcs", e.g. /2/999/123 -> /Example/123 . * @author Daniel Marschall, ViaThinkSoft * @version 2020-05-22 * @param string $iri
* An OID in OID-IRI notation, e.g. /Example/test * @return string|false The modified IRI. **/ function iri_add_longarcs($iri) { $iri_long_arcs = iri_get_long_arcs(); if (!iri_valid($iri)) return false; $ary = explode('/', $iri); $ary_number_iri = $ary; if ($ary_number_iri[1] == 'Joint-ISO-ITU-T') $ary_number_iri[1] = '2'; $number_iri = implode('/', $ary_number_iri); foreach ($iri_long_arcs as $cur_longarc => $cur_iri) { assert(iri_valid($cur_iri)); if (strpos($number_iri.'/', $cur_iri.'/') === 0) { $cnt = substr_count($cur_iri, '/'); for ($i=1; $i<$cnt; $i++) { array_shift($ary); } $ary[0] = ''; $ary[1] = $cur_longarc; $iri = implode('/', $ary); break; } } return $iri; } /* assert(iri_add_longarcs('/2/999/123') === '/Example/123'); */ # === FUNCTIONS FOR OIDS IN ASN.1 NOTATION === /** * Checks if an ASN.1 identifier is valid. * @author Daniel Marschall, ViaThinkSoft * @version 2020-05-22 * @param string $id
* An ASN.1 identifier, e.g. "example". Not "example(99)" or "99" and not a path like "{ 2 999 }" * Note: Use asn1_path_valid() for validating a whole ASN.1 notation path. * @return boolean true, if the identifier is valid: It begins with an lowercase letter and contains only 0-9, a-z, A-Z and "-" **/ function oid_id_is_valid($id) { // see Rec. ITU-T X.660 | ISO/IEC 9834-1, clause 7.7 // and Rec. ITU-T X.680 | ISO/IEC 8824-1, clause 12.3 if (substr($id,-1,1) == '-') return false; if (strstr($id,'--')) return false; return preg_match('/^([a-z][a-zA-Z0-9-]*)$/', $id) != 0; } /** * Checks if the ASN.1 notation of an OID is valid. * This function does not tolerate leading zeros. * This function will fail (return false) if there are unresolved symbols, e.g. {iso test} is not valid while { iso 123 } is valid. * @author Daniel Marschall, ViaThinkSoft * @version 2014-12-17 * @param string $asn1
* An OID in ASN.1 notation. * @return boolean true if the identifier is valid. **/ function asn1_path_valid($asn1) { return asn1_to_dot($asn1) != false; } /** * Returns an array of standardized ASN.1 alphanumeric identifiers which do not require a numeric identifier, e.g. { 2 example } * The array has the form '0.0.a' -> '0.0.1' * @author Daniel Marschall, ViaThinkSoft * @version 2019-03-25 * @see http://www.oid-info.com/name-forms.htm * @return array Associative array of standardized ASN.1 alphanumeric identifiers **/ function asn1_get_standardized_array() { // Taken from oid-info.com // http://www.oid-info.com/name-forms.htm $standardized = array(); $standardized['itu-t'] = '0'; $standardized['ccitt'] = '0'; $standardized['iso'] = '1'; $standardized['joint-iso-itu-t'] = '2'; $standardized['joint-iso-ccitt'] = '2'; $standardized['0.recommendation'] = '0.0'; $standardized['0.0.a'] = '0.0.1'; $standardized['0.0.b'] = '0.0.2'; $standardized['0.0.c'] = '0.0.3'; $standardized['0.0.d'] = '0.0.4'; $standardized['0.0.e'] = '0.0.5'; $standardized['0.0.f'] = '0.0.6'; $standardized['0.0.g'] = '0.0.7'; $standardized['0.0.h'] = '0.0.8'; $standardized['0.0.i'] = '0.0.9'; $standardized['0.0.j'] = '0.0.10'; $standardized['0.0.k'] = '0.0.11'; $standardized['0.0.l'] = '0.0.12'; $standardized['0.0.m'] = '0.0.13'; $standardized['0.0.n'] = '0.0.14'; $standardized['0.0.o'] = '0.0.15'; $standardized['0.0.p'] = '0.0.16'; $standardized['0.0.q'] = '0.0.17'; $standardized['0.0.r'] = '0.0.18'; $standardized['0.0.s'] = '0.0.19'; $standardized['0.0.t'] = '0.0.20'; $standardized['0.0.u'] = '0.0.21'; $standardized['0.0.v'] = '0.0.22'; $standardized['0.0.w'] = '0.0.23'; // actually, this OID does not exist $standardized['0.0.x'] = '0.0.24'; $standardized['0.0.y'] = '0.0.25'; $standardized['0.0.z'] = '0.0.26'; $standardized['0.question'] = '0.1'; $standardized['0.administration'] = '0.2'; $standardized['0.network-operator'] = '0.3'; $standardized['0.identified-organization'] = '0.4'; $standardized['1.standard'] = '1.0'; $standardized['1.registration-authority'] = '1.1'; $standardized['1.member-body'] = '1.2'; $standardized['1.identified-organization'] = '1.3'; return $standardized; } /** * Converts an OID in ASN.1 notation into an OID in dot notation and tries to resolve well-known identifiers.
* e.g. {joint-iso-itu-t(2) example(999) 1 2 3} --> 2.999.1.2.3
* e.g. {iso 3} --> 1.3 * This function does not tolerate leading zeros. * This function will fail (return false) if there are unresolved symbols, e.g. {iso test} will not be resolved to 1.test * @author Daniel Marschall, ViaThinkSoft * @version 2014-12-17 * @param string $asn
* An OID in ASN.1 notation. * @return string|false An OID in dot notation without leading dot or false if the path is invalid. **/ function asn1_to_dot($asn) { $standardized = asn1_get_standardized_array(); // Clean up $count = -1; $asn = preg_replace('@^\\{(.+)\\}$@', '\\1', $asn, -1, $count); if ($count == 0) return false; // { and } are required. The ASN.1 path will NOT be trimmed by this function // If identifier is set, apply it (no check if it overrides a standardized identifier) $asn = preg_replace('|\s*([a-z][a-zA-Z0-9-]*)\s*\((\d+)\)|', ' \\2', $asn); $asn = trim($asn); // Set dots $asn = preg_replace('|\s+|', '.', $asn); // Apply standardized identifiers (case sensitive) $asn .= '.'; foreach ($standardized as $s => $r) { $asn = preg_replace("@^".preg_quote($s,"@")."@", $r, $asn); } $asn = substr($asn, 0, strlen($asn)-1); // Check if all numbers are OK // -> every arc must be resolved // -> numeric arcs must not have a leading zero // -> invalid stuff will be recognized, e.g. a "(1)" without an identifier in front of it $ary = explode('.', $asn); foreach ($ary as $a) { $m = array(); if (!preg_match('@^(0|([1-9]\\d*))$@', $a, $m)) return false; } return $asn; } /* assert(asn1_to_dot('{2 999 (1)}') == false); assert(asn1_to_dot('{2 999 test}') == false); assert(asn1_to_dot('{2 999 1}') == '2.999.1'); assert(asn1_to_dot(' {2 999 1} ') == false); assert(asn1_to_dot('2 999 1') == false); assert(asn1_to_dot('{2 999 01}') == false); assert(asn1_to_dot('{ 0 question 123 }') == '0.1.123'); assert(asn1_to_dot('{ iso }') == '1'); assert(asn1_to_dot('{ iso(1) }') == '1'); assert(asn1_to_dot('{ iso(2) }') == '2'); assert(asn1_to_dot('{ iso 3 }') == '1.3'); */ /** * Gets the last numeric identifier of an ASN.1 notation OID. * @author Daniel Marschall, ViaThinkSoft * @version 2020-06-11 * @param string $asn1id
* An ASN.1 identifier string, e.g. { 2 example(999) test(1) } * @return int|false The last numeric identifier arc, e.g. "1" or false if the ID is invalid **/ function asn1_last_identifier($asn1id) { $asn1id = preg_replace('@\(\s*\d+\s*\)@', '', $asn1id); $asn1id = trim(str_replace(array('{', '}', "\t"), ' ', $asn1id)); $ary = explode(' ', $asn1id); $asn1id = $ary[count($ary)-1]; return preg_match('#[^0-9]#',$asn1id) ? (int)$asn1id : false; } /** * "Soft corrects" an invalid ASN.1 identifier.
* Attention, by "soft correcting" the ID, it is not authoritative anymore, and might not be able to be resolved by ORS. * @author Daniel Marschall, ViaThinkSoft * @version 2020-05-22 * @param string $id
* An ASN.1 identifier. * @param boolean $append_id_prefix
* true (default): If the identifier doesn't start with a-Z, the problem will be solved by prepending "id-" to the identifier.
* false: If the identifier doesn't start with a-Z, then the problem cannot be solved (method returns empty string). * @return string The "soft corrected" ASN.1 identifier.
* Invalid characters will be removed.
* Uncorrectable start elements (0-9 or "-") will be either removed or solved by prepending "id-" (see $append_id_prefix)
* If the identifier begins with an upper case letter, the letter will be converted into lower case. **/ function oid_soft_correct_id($id, $append_id_prefix = true) { // Convert "_" to "-" $id = str_replace('_', '-', $id); // Convert "--" to "-" $id = str_replace('--', '-', $id); // Remove invalid characters $id = preg_replace('/[^a-zA-Z0-9-]+/', '', $id); // Remove uncorrectable start elements (0-9 or "-") if ($append_id_prefix) { $id = preg_replace('/^([^a-zA-Z]+)/', 'id-$1', $id); } else { $id = preg_replace('/^([^a-zA-Z]+)/', '', $id); } // "Correct" upper case beginning letter by converting it to lower case if (preg_match('/^[A-Z]/', $id)) { $id = strtolower($id[0]) . substr($id, 1); } return $id; }