android-key.php
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packed.php
209 lines
| 1 | <?php |
| 2 | /** |
| 3 | * Passkeys formatters |
| 4 | * |
| 5 | * @package wp-2fa |
| 6 | * @since 3.0.0 |
| 7 | * @copyright 2026 Melapress |
| 8 | * @license https://www.apache.org/licenses/LICENSE-2.0 Apache License 2.0 |
| 9 | * @link https://wordpress.org/plugins/wp-2fa/ |
| 10 | */ |
| 11 | |
| 12 | namespace WP2FA\Passkeys\Format; |
| 13 | |
| 14 | use WP2FA\Methods\Passkeys\Byte_Buffer; |
| 15 | use WP2FA\Methods\Passkeys\Web_Authn_Exception; |
| 16 | use WP2FA\Admin\Methods\passkeys\Authenticator_Data; |
| 17 | |
| 18 | /** |
| 19 | * Responsible for packed format |
| 20 | * |
| 21 | * @since 3.0.0 |
| 22 | */ |
| 23 | class Packed extends Format_Base { |
| 24 | |
| 25 | /** |
| 26 | * Algorithm to be used |
| 27 | * |
| 28 | * @var string |
| 29 | * |
| 30 | * @since 3.0.0 |
| 31 | */ |
| 32 | private $_alg; |
| 33 | |
| 34 | /** |
| 35 | * Signature |
| 36 | * |
| 37 | * @var string |
| 38 | * |
| 39 | * @since 3.0.0 |
| 40 | */ |
| 41 | private $_signature; |
| 42 | |
| 43 | /** |
| 44 | * X5c certificate |
| 45 | * |
| 46 | * @var string |
| 47 | * |
| 48 | * @since 3.0.0 |
| 49 | */ |
| 50 | private $x5c; |
| 51 | |
| 52 | /** |
| 53 | * Default constructor |
| 54 | * |
| 55 | * @param \StdClass $attestion_object - attestation object. |
| 56 | * @param \WP2FA\Admin\Methods\passkeys\Authenticator_Data $authenticator_data - Authentication data. |
| 57 | * |
| 58 | * @throws Web_Authn_Exception - if can not be created. |
| 59 | * |
| 60 | * @since 3.0.0 |
| 61 | */ |
| 62 | public function __construct( $attestion_object, Authenticator_Data $authenticator_data ) { |
| 63 | parent::__construct( $attestion_object, $authenticator_data ); |
| 64 | |
| 65 | // check packed data. |
| 66 | $att_stmt = $this->attestation_object['attStmt']; |
| 67 | |
| 68 | if ( ! \array_key_exists( 'alg', $att_stmt ) || $this->_get_cose_algorithm( $att_stmt['alg'] ) === null ) { |
| 69 | throw new Web_Authn_Exception( 'unsupported alg: ' . $att_stmt['alg'], Web_Authn_Exception::INVALID_DATA ); |
| 70 | } |
| 71 | |
| 72 | if ( ! \array_key_exists( 'sig', $att_stmt ) || ! \is_object( $att_stmt['sig'] ) || ! ( $att_stmt['sig'] instanceof Byte_Buffer ) ) { |
| 73 | throw new Web_Authn_Exception( 'no signature found', Web_Authn_Exception::INVALID_DATA ); |
| 74 | } |
| 75 | |
| 76 | $this->_alg = $att_stmt['alg']; |
| 77 | $this->_signature = $att_stmt['sig']->getBinaryString(); |
| 78 | |
| 79 | // certificate for validation. |
| 80 | if ( \array_key_exists( 'x5c', $att_stmt ) && \is_array( $att_stmt['x5c'] ) && \count( $att_stmt['x5c'] ) > 0 ) { |
| 81 | |
| 82 | // The attestation certificate attestn_cert MUST be the first element in the array. |
| 83 | $attestn_cert = array_shift( $att_stmt['x5c'] ); |
| 84 | |
| 85 | if ( ! ( $attestn_cert instanceof Byte_Buffer ) ) { |
| 86 | throw new Web_Authn_Exception( 'invalid x5c certificate', Web_Authn_Exception::INVALID_DATA ); |
| 87 | } |
| 88 | |
| 89 | $this->x5c = $attestn_cert->getBinaryString(); |
| 90 | |
| 91 | // certificate chain. |
| 92 | foreach ( $att_stmt['x5c'] as $chain ) { |
| 93 | if ( $chain instanceof Byte_Buffer ) { |
| 94 | $this->x5c_chain[] = $chain->getBinaryString(); |
| 95 | } |
| 96 | } |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * Returns the key certificate in PEM format |
| 102 | * |
| 103 | * @return string|null |
| 104 | * |
| 105 | * @since 3.0.0 |
| 106 | */ |
| 107 | public function get_certificate_pem() { |
| 108 | if ( ! $this->x5c ) { |
| 109 | return null; |
| 110 | } |
| 111 | return $this->_create_certificate_pem( $this->x5c ); |
| 112 | } |
| 113 | |
| 114 | /** |
| 115 | * Validates the attestation |
| 116 | * |
| 117 | * @param string $client_data_hash - Hash collected. |
| 118 | * |
| 119 | * @return bool |
| 120 | * |
| 121 | * @since 3.0.0 |
| 122 | */ |
| 123 | public function validate_attestation( $client_data_hash ) { |
| 124 | if ( $this->x5c ) { |
| 125 | return $this->_validate_over_x5c( $client_data_hash ); |
| 126 | } else { |
| 127 | return $this->_validate_self_attestation( $client_data_hash ); |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | /** |
| 132 | * Validates the certificate against root certificates |
| 133 | * |
| 134 | * @param array $root_cas - Array with values. |
| 135 | * |
| 136 | * @return boolean |
| 137 | * |
| 138 | * @throws Web_Authn_Exception - Throws exception. |
| 139 | * |
| 140 | * @since 3.0.0 |
| 141 | */ |
| 142 | public function validate_root_certificate( $root_cas ) { |
| 143 | if ( ! $this->x5c ) { |
| 144 | return false; |
| 145 | } |
| 146 | |
| 147 | $chain_c = $this->_create_x5c_chain_file(); |
| 148 | if ( $chain_c ) { |
| 149 | $root_cas[] = $chain_c; |
| 150 | } |
| 151 | |
| 152 | $v = \openssl_x509_checkpurpose( $this->get_certificate_pem(), -1, $root_cas ); |
| 153 | if ( -1 === $v ) { |
| 154 | throw new Web_Authn_Exception( 'error on validating root certificate: ' . \openssl_error_string(), Web_Authn_Exception::CERTIFICATE_NOT_TRUSTED ); |
| 155 | } |
| 156 | return $v; |
| 157 | } |
| 158 | |
| 159 | /** |
| 160 | * Validate if x5c is present |
| 161 | * |
| 162 | * @param string $client_data_hash - Hash collected. |
| 163 | * |
| 164 | * @return bool |
| 165 | * |
| 166 | * @throws Web_Authn_Exception - Throws exception. |
| 167 | * |
| 168 | * @since 3.0.0 |
| 169 | */ |
| 170 | protected function _validate_over_x5c( $client_data_hash ) { |
| 171 | $public_key = \openssl_pkey_get_public( $this->get_certificate_pem() ); |
| 172 | |
| 173 | if ( false === $public_key ) { |
| 174 | throw new Web_Authn_Exception( 'invalid public key: ' . \openssl_error_string(), Web_Authn_Exception::INVALID_PUBLIC_KEY ); |
| 175 | } |
| 176 | |
| 177 | // Verify that sig is a valid signature over the concatenation of Authenticator_Data and client_data_hash |
| 178 | // using the attestation public key in attestn_cert with the algorithm specified in alg. |
| 179 | $data_to_verify = $this->authenticator_data->get_binary(); |
| 180 | $data_to_verify .= $client_data_hash; |
| 181 | |
| 182 | $cose_algorithm = $this->_get_cose_algorithm( $this->_alg ); |
| 183 | |
| 184 | // check certificate. |
| 185 | return \openssl_verify( $data_to_verify, $this->_signature, $public_key, $cose_algorithm->openssl ) === 1; |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * Validate if self attestation is in use |
| 190 | * |
| 191 | * @param string $client_data_hash - Hash collected. |
| 192 | * |
| 193 | * @return bool |
| 194 | * |
| 195 | * @since 3.0.0 |
| 196 | */ |
| 197 | protected function _validate_self_attestation( $client_data_hash ) { |
| 198 | // Verify that sig is a valid signature over the concatenation of Authenticator_Data and client_data_hash |
| 199 | // using the credential public key with alg. |
| 200 | $data_to_verify = $this->authenticator_data->get_binary(); |
| 201 | $data_to_verify .= $client_data_hash; |
| 202 | |
| 203 | $public_key = $this->authenticator_data->get_public_key_pem(); |
| 204 | |
| 205 | // check certificate. |
| 206 | return \openssl_verify( $data_to_verify, $this->_signature, $public_key, OPENSSL_ALGO_SHA256 ) === 1; |
| 207 | } |
| 208 | } |
| 209 |