mirror of
https://github.com/phpseclib/phpseclib.git
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ASN1: rewrite _decode_der
this rewrite makes phpseclib better able to handle indef lengths, which had previously been untested.
This commit is contained in:
terrafrost
parent
7696cbf826
commit
e258e001fa
@ -272,7 +272,8 @@ class File_ASN1
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}
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}
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$this->encoded = $encoded;
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$this->encoded = $encoded;
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return $this->_decode_ber($encoded);
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// encapsulate in an array for BC with the old decodeBER
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return array($this->_decode_ber($encoded));
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}
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}
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/**
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/**
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@ -287,215 +288,233 @@ class File_ASN1
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* @return Array
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* @return Array
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* @access private
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* @access private
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*/
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*/
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function _decode_ber(&$encoded, $start = 0)
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function _decode_ber($encoded, $start = 0)
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{
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{
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$decoded = array();
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$current = array('start' => $start);
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while ( strlen($encoded) ) {
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$type = ord($this->_string_shift($encoded));
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$current = array('start' => $start);
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$start++;
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$type = ord($this->_string_shift($encoded));
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$constructed = ($type >> 5) & 1;
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$start++;
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$constructed = ($type >> 5) & 1;
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$tag = $type & 0x1F;
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if ($tag == 0x1F) {
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$tag = $type & 0x1F;
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$tag = 0;
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if ($tag == 0x1F) {
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// process septets (since the eighth bit is ignored, it's not an octet)
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$tag = 0;
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do {
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// process septets (since the eighth bit is ignored, it's not an octet)
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$loop = ord($encoded[0]) >> 7;
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do {
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$tag <<= 7;
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$loop = ord($encoded[0]) >> 7;
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$tag |= ord($this->_string_shift($encoded)) & 0x7F;
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$tag <<= 7;
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$start++;
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$tag |= ord($this->_string_shift($encoded)) & 0x7F;
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} while ( $loop );
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$start++;
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} while ( $loop );
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}
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// Length, as discussed in paragraph 8.1.3 of X.690-0207.pdf#page=13
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$length = ord($this->_string_shift($encoded));
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$start++;
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if ( $length == 0x80 ) { // indefinite length
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// "[A sender shall] use the indefinite form (see 8.1.3.6) if the encoding is constructed and is not all
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// immediately available." -- paragraph 8.1.3.2.c
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//if ( !$constructed ) {
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// return false;
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//}
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$length = strlen($encoded);
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} elseif ( $length & 0x80 ) { // definite length, long form
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// technically, the long form of the length can be represented by up to 126 octets (bytes), but we'll only
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// support it up to four.
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$length&= 0x7F;
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$temp = $this->_string_shift($encoded, $length);
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// tags of indefinite length don't really have a header length; this length includes the tag
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$current+= array('headerlength' => $length + 2);
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$start+= $length;
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extract(unpack('Nlength', substr(str_pad($temp, 4, chr(0), STR_PAD_LEFT), -4)));
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} else {
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$current+= array('headerlength' => 2);
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}
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// End-of-content, see paragraphs 8.1.1.3, 8.1.3.2, 8.1.3.6, 8.1.5, and (for an example) 8.6.4.2
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if (!$type && !$length) {
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return $decoded;
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}
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$content = $this->_string_shift($encoded, $length);
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/* Class is UNIVERSAL, APPLICATION, PRIVATE, or CONTEXT-SPECIFIC. The UNIVERSAL class is restricted to the ASN.1
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built-in types. It defines an application-independent data type that must be distinguishable from all other
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data types. The other three classes are user defined. The APPLICATION class distinguishes data types that
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have a wide, scattered use within a particular presentation context. PRIVATE distinguishes data types within
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a particular organization or country. CONTEXT-SPECIFIC distinguishes members of a sequence or set, the
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alternatives of a CHOICE, or universally tagged set members. Only the class number appears in braces for this
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data type; the term CONTEXT-SPECIFIC does not appear.
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-- http://www.obj-sys.com/asn1tutorial/node12.html */
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$class = ($type >> 6) & 3;
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switch ($class) {
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case FILE_ASN1_CLASS_APPLICATION:
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case FILE_ASN1_CLASS_PRIVATE:
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case FILE_ASN1_CLASS_CONTEXT_SPECIFIC:
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$decoded[] = array(
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'type' => $class,
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'constant' => $tag,
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'content' => $constructed ? $this->_decode_ber($content, $start) : $content,
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'length' => $length + $start - $current['start']
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) + $current;
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$start+= $length;
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continue 2;
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}
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$current+= array('type' => $tag);
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// decode UNIVERSAL tags
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switch ($tag) {
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case FILE_ASN1_TYPE_BOOLEAN:
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// "The contents octets shall consist of a single octet." -- paragraph 8.2.1
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//if (strlen($content) != 1) {
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// return false;
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//}
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$current['content'] = (bool) ord($content[0]);
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break;
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case FILE_ASN1_TYPE_INTEGER:
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case FILE_ASN1_TYPE_ENUMERATED:
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$current['content'] = new Math_BigInteger($content, -256);
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break;
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case FILE_ASN1_TYPE_REAL: // not currently supported
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return false;
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case FILE_ASN1_TYPE_BIT_STRING:
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// The initial octet shall encode, as an unsigned binary integer with bit 1 as the least significant bit,
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// the number of unused bits in the final subsequent octet. The number shall be in the range zero to
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// seven.
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if (!$constructed) {
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$current['content'] = $content;
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} else {
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$temp = $this->_decode_ber($content, $start);
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$length-= strlen($content);
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$last = count($temp) - 1;
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for ($i = 0; $i < $last; $i++) {
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// all subtags should be bit strings
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//if ($temp[$i]['type'] != FILE_ASN1_TYPE_BIT_STRING) {
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// return false;
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//}
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$current['content'].= substr($temp[$i]['content'], 1);
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}
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// all subtags should be bit strings
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//if ($temp[$last]['type'] != FILE_ASN1_TYPE_BIT_STRING) {
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// return false;
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//}
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$current['content'] = $temp[$last]['content'][0] . $current['content'] . substr($temp[$i]['content'], 1);
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}
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break;
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case FILE_ASN1_TYPE_OCTET_STRING:
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if (!$constructed) {
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$current['content'] = $content;
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} else {
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$temp = $this->_decode_ber($content, $start);
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$length-= strlen($content);
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for ($i = 0, $size = count($temp); $i < $size; $i++) {
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// all subtags should be octet strings
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//if ($temp[$i]['type'] != FILE_ASN1_TYPE_OCTET_STRING) {
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// return false;
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//}
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$current['content'].= $temp[$i]['content'];
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}
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// $length =
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}
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break;
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case FILE_ASN1_TYPE_NULL:
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// "The contents octets shall not contain any octets." -- paragraph 8.8.2
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//if (strlen($content)) {
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// return false;
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//}
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break;
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case FILE_ASN1_TYPE_SEQUENCE:
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case FILE_ASN1_TYPE_SET:
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$current['content'] = $this->_decode_ber($content, $start);
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break;
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case FILE_ASN1_TYPE_OBJECT_IDENTIFIER:
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$temp = ord($this->_string_shift($content));
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$current['content'] = sprintf('%d.%d', floor($temp / 40), $temp % 40);
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$valuen = 0;
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// process septets
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while (strlen($content)) {
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$temp = ord($this->_string_shift($content));
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$valuen <<= 7;
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$valuen |= $temp & 0x7F;
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if (~$temp & 0x80) {
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$current['content'].= ".$valuen";
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$valuen = 0;
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}
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}
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// the eighth bit of the last byte should not be 1
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//if ($temp >> 7) {
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// return false;
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//}
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break;
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/* Each character string type shall be encoded as if it had been declared:
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[UNIVERSAL x] IMPLICIT OCTET STRING
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-- X.690-0207.pdf#page=23 (paragraph 8.21.3)
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Per that, we're not going to do any validation. If there are any illegal characters in the string,
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we don't really care */
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case FILE_ASN1_TYPE_NUMERIC_STRING:
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// 0,1,2,3,4,5,6,7,8,9, and space
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case FILE_ASN1_TYPE_PRINTABLE_STRING:
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// Upper and lower case letters, digits, space, apostrophe, left/right parenthesis, plus sign, comma,
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// hyphen, full stop, solidus, colon, equal sign, question mark
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case FILE_ASN1_TYPE_TELETEX_STRING:
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// The Teletex character set in CCITT's T61, space, and delete
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// see http://en.wikipedia.org/wiki/Teletex#Character_sets
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case FILE_ASN1_TYPE_VIDEOTEX_STRING:
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// The Videotex character set in CCITT's T.100 and T.101, space, and delete
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case FILE_ASN1_TYPE_VISIBLE_STRING:
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// Printing character sets of international ASCII, and space
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case FILE_ASN1_TYPE_IA5_STRING:
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// International Alphabet 5 (International ASCII)
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case FILE_ASN1_TYPE_GRAPHIC_STRING:
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// All registered G sets, and space
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case FILE_ASN1_TYPE_GENERAL_STRING:
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// All registered C and G sets, space and delete
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case FILE_ASN1_TYPE_UTF8_STRING:
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// ????
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case FILE_ASN1_TYPE_BMP_STRING:
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$current['content'] = $content;
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break;
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case FILE_ASN1_TYPE_UTC_TIME:
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case FILE_ASN1_TYPE_GENERALIZED_TIME:
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$current['content'] = $this->_decodeTime($content, $tag);
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default:
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}
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$start+= $length;
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$decoded[] = $current + array('length' => $start - $current['start']);
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}
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}
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return $decoded;
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// Length, as discussed in paragraph 8.1.3 of X.690-0207.pdf#page=13
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$length = ord($this->_string_shift($encoded));
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$start++;
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if ( $length == 0x80 ) { // indefinite length
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// "[A sender shall] use the indefinite form (see 8.1.3.6) if the encoding is constructed and is not all
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// immediately available." -- paragraph 8.1.3.2.c
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$length = strlen($encoded);
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} elseif ( $length & 0x80 ) { // definite length, long form
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// technically, the long form of the length can be represented by up to 126 octets (bytes), but we'll only
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// support it up to four.
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$length&= 0x7F;
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$temp = $this->_string_shift($encoded, $length);
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// tags of indefinte length don't really have a header length; this length includes the tag
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$current+= array('headerlength' => $length + 2);
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$start+= $length;
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extract(unpack('Nlength', substr(str_pad($temp, 4, chr(0), STR_PAD_LEFT), -4)));
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} else {
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$current+= array('headerlength' => 2);
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}
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$content = $this->_string_shift($encoded, $length);
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// at this point $length can be overwritten. it's only accurate for definite length things as is
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/* Class is UNIVERSAL, APPLICATION, PRIVATE, or CONTEXT-SPECIFIC. The UNIVERSAL class is restricted to the ASN.1
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built-in types. It defines an application-independent data type that must be distinguishable from all other
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data types. The other three classes are user defined. The APPLICATION class distinguishes data types that
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have a wide, scattered use within a particular presentation context. PRIVATE distinguishes data types within
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a particular organization or country. CONTEXT-SPECIFIC distinguishes members of a sequence or set, the
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alternatives of a CHOICE, or universally tagged set members. Only the class number appears in braces for this
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data type; the term CONTEXT-SPECIFIC does not appear.
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-- http://www.obj-sys.com/asn1tutorial/node12.html */
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$class = ($type >> 6) & 3;
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switch ($class) {
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case FILE_ASN1_CLASS_APPLICATION:
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case FILE_ASN1_CLASS_PRIVATE:
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case FILE_ASN1_CLASS_CONTEXT_SPECIFIC:
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$newcontent = $this->_decode_ber($content, $start);
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$length = $newcontent['length'];
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if (substr($content, $length, 2) == "\0\0") {
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$length+= 2;
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}
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$start+= $length;
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return array(
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'type' => $class,
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'constant' => $tag,
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// the array encapsulation is for BC with the old format
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'content' => array($newcontent),
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// the only time when $content['headerlength'] isn't defined is when the length is indefinite.
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// the absence of $content['headerlength'] is how we know if something is indefinite or not.
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// technically, it could be defined to be 2 and then another indicator could be used but whatever.
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'length' => $start - $current['start']
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) + $current;
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}
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$current+= array('type' => $tag);
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// decode UNIVERSAL tags
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switch ($tag) {
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case FILE_ASN1_TYPE_BOOLEAN:
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// "The contents octets shall consist of a single octet." -- paragraph 8.2.1
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//if (strlen($content) != 1) {
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// return false;
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//}
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$current['content'] = (bool) ord($content[0]);
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break;
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case FILE_ASN1_TYPE_INTEGER:
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case FILE_ASN1_TYPE_ENUMERATED:
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$current['content'] = new Math_BigInteger($content, -256);
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break;
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case FILE_ASN1_TYPE_REAL: // not currently supported
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return false;
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case FILE_ASN1_TYPE_BIT_STRING:
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// The initial octet shall encode, as an unsigned binary integer with bit 1 as the least significant bit,
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// the number of unused bits in the final subsequent octet. The number shall be in the range zero to
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// seven.
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if (!$constructed) {
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$current['content'] = $content;
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} else {
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$temp = $this->_decode_ber($content, $start);
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$length-= strlen($content);
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$last = count($temp) - 1;
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for ($i = 0; $i < $last; $i++) {
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// all subtags should be bit strings
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//if ($temp[$i]['type'] != FILE_ASN1_TYPE_BIT_STRING) {
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// return false;
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//}
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$current['content'].= substr($temp[$i]['content'], 1);
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}
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// all subtags should be bit strings
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//if ($temp[$last]['type'] != FILE_ASN1_TYPE_BIT_STRING) {
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// return false;
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//}
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$current['content'] = $temp[$last]['content'][0] . $current['content'] . substr($temp[$i]['content'], 1);
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}
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break;
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case FILE_ASN1_TYPE_OCTET_STRING:
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if (!$constructed) {
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$current['content'] = $content;
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} else {
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$current['content'] = '';
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$length = 0;
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while (substr($content, 0, 2) != "\0\0") {
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$temp = $this->_decode_ber($content, $length + $start);
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$this->_string_shift($content, $temp['length']);
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// all subtags should be octet strings
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//if ($temp['type'] != FILE_ASN1_TYPE_OCTET_STRING) {
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// return false;
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//}
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$current['content'].= $temp['content'];
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$length+= $temp['length'];
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}
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if (substr($content, 0, 2) == "\0\0") {
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$length+= 2; // +2 for the EOC
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}
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}
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break;
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case FILE_ASN1_TYPE_NULL:
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||||||
|
// "The contents octets shall not contain any octets." -- paragraph 8.8.2
|
||||||
|
//if (strlen($content)) {
|
||||||
|
// return false;
|
||||||
|
//}
|
||||||
|
break;
|
||||||
|
case FILE_ASN1_TYPE_SEQUENCE:
|
||||||
|
case FILE_ASN1_TYPE_SET:
|
||||||
|
$offset = 0;
|
||||||
|
$current['content'] = array();
|
||||||
|
while (strlen($content)) {
|
||||||
|
// if indefinite length construction was used and we have an end-of-content string next
|
||||||
|
// see paragraphs 8.1.1.3, 8.1.3.2, 8.1.3.6, 8.1.5, and (for an example) 8.6.4.2
|
||||||
|
if (!isset($current['headerlength']) && substr($content, 0, 2) == "\0\0") {
|
||||||
|
$length = $offset + 2; // +2 for the EOC
|
||||||
|
break 2;
|
||||||
|
}
|
||||||
|
$temp = $this->_decode_ber($content, $start + $offset);
|
||||||
|
$this->_string_shift($content, $temp['length']);
|
||||||
|
$current['content'][] = $temp;
|
||||||
|
$offset+= $temp['length'];
|
||||||
|
}
|
||||||
|
break;
|
||||||
|
case FILE_ASN1_TYPE_OBJECT_IDENTIFIER:
|
||||||
|
$temp = ord($this->_string_shift($content));
|
||||||
|
$current['content'] = sprintf('%d.%d', floor($temp / 40), $temp % 40);
|
||||||
|
$valuen = 0;
|
||||||
|
// process septets
|
||||||
|
while (strlen($content)) {
|
||||||
|
$temp = ord($this->_string_shift($content));
|
||||||
|
$valuen <<= 7;
|
||||||
|
$valuen |= $temp & 0x7F;
|
||||||
|
if (~$temp & 0x80) {
|
||||||
|
$current['content'].= ".$valuen";
|
||||||
|
$valuen = 0;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
// the eighth bit of the last byte should not be 1
|
||||||
|
//if ($temp >> 7) {
|
||||||
|
// return false;
|
||||||
|
//}
|
||||||
|
break;
|
||||||
|
/* Each character string type shall be encoded as if it had been declared:
|
||||||
|
[UNIVERSAL x] IMPLICIT OCTET STRING
|
||||||
|
|
||||||
|
-- X.690-0207.pdf#page=23 (paragraph 8.21.3)
|
||||||
|
|
||||||
|
Per that, we're not going to do any validation. If there are any illegal characters in the string,
|
||||||
|
we don't really care */
|
||||||
|
case FILE_ASN1_TYPE_NUMERIC_STRING:
|
||||||
|
// 0,1,2,3,4,5,6,7,8,9, and space
|
||||||
|
case FILE_ASN1_TYPE_PRINTABLE_STRING:
|
||||||
|
// Upper and lower case letters, digits, space, apostrophe, left/right parenthesis, plus sign, comma,
|
||||||
|
// hyphen, full stop, solidus, colon, equal sign, question mark
|
||||||
|
case FILE_ASN1_TYPE_TELETEX_STRING:
|
||||||
|
// The Teletex character set in CCITT's T61, space, and delete
|
||||||
|
// see http://en.wikipedia.org/wiki/Teletex#Character_sets
|
||||||
|
case FILE_ASN1_TYPE_VIDEOTEX_STRING:
|
||||||
|
// The Videotex character set in CCITT's T.100 and T.101, space, and delete
|
||||||
|
case FILE_ASN1_TYPE_VISIBLE_STRING:
|
||||||
|
// Printing character sets of international ASCII, and space
|
||||||
|
case FILE_ASN1_TYPE_IA5_STRING:
|
||||||
|
// International Alphabet 5 (International ASCII)
|
||||||
|
case FILE_ASN1_TYPE_GRAPHIC_STRING:
|
||||||
|
// All registered G sets, and space
|
||||||
|
case FILE_ASN1_TYPE_GENERAL_STRING:
|
||||||
|
// All registered C and G sets, space and delete
|
||||||
|
case FILE_ASN1_TYPE_UTF8_STRING:
|
||||||
|
// ????
|
||||||
|
case FILE_ASN1_TYPE_BMP_STRING:
|
||||||
|
$current['content'] = $content;
|
||||||
|
break;
|
||||||
|
case FILE_ASN1_TYPE_UTC_TIME:
|
||||||
|
case FILE_ASN1_TYPE_GENERALIZED_TIME:
|
||||||
|
$current['content'] = $this->_decodeTime($content, $tag);
|
||||||
|
default:
|
||||||
|
}
|
||||||
|
|
||||||
|
$start+= $length;
|
||||||
|
|
||||||
|
// ie. length is the length of the full TLV encoding - it's not just the length of the value
|
||||||
|
return $current + array('length' => $start - $current['start']);
|
||||||
}
|
}
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* ASN.1 Decode
|
* ASN.1 Map
|
||||||
*
|
*
|
||||||
* Provides an ASN.1 semantic mapping ($mapping) from a parsed BER-encoding to a human readable format.
|
* Provides an ASN.1 semantic mapping ($mapping) from a parsed BER-encoding to a human readable format.
|
||||||
*
|
*
|
||||||
@ -805,16 +824,6 @@ class File_ASN1
|
|||||||
return $this->_encode_der($source, $mapping, null, $special);
|
return $this->_encode_der($source, $mapping, null, $special);
|
||||||
}
|
}
|
||||||
|
|
||||||
/**
|
|
||||||
* ASN.1 Encode (Helper function)
|
|
||||||
*
|
|
||||||
* @param String $source
|
|
||||||
* @param Array $mapping
|
|
||||||
* @param Integer $idx
|
|
||||||
* @param Array $special
|
|
||||||
* @return String
|
|
||||||
* @access private
|
|
||||||
*/
|
|
||||||
/**
|
/**
|
||||||
* ASN.1 Encode (Helper function)
|
* ASN.1 Encode (Helper function)
|
||||||
*
|
*
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user