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| 1 | <?php |
| 2 | /* |
| 3 | * Jetpack CRM |
| 4 | * https://jetpackcrm.com |
| 5 | * |
| 6 | * Encryption wrapper |
| 7 | * |
| 8 | */ |
| 9 | namespace Automattic\JetpackCRM; |
| 10 | |
| 11 | // block direct access |
| 12 | defined( 'ZEROBSCRM_PATH' ) || exit( 0 ); |
| 13 | |
| 14 | class Encryption { |
| 15 | |
| 16 | private $cipher = 'aes-256-gcm'; // AES-256-GCM Cipher we're going to use to encrypt - previously we used AES-256-CBC |
| 17 | private $cipher_fallback = 'aes-256-cbc'; // AES-256-CBC is our fallback |
| 18 | private $tag_length = 16; // AES GCM tag length (MAC) |
| 19 | private $default_key = false; |
| 20 | private $ready_to_encrypt = true; |
| 21 | |
| 22 | /** |
| 23 | * Setup |
| 24 | */ |
| 25 | public function __construct() { |
| 26 | |
| 27 | // check if we have the algorhithm we want to use, and fall back if not |
| 28 | $this->check_cipher_and_fallback(); |
| 29 | } |
| 30 | |
| 31 | /* |
| 32 | * check if we have the algorhithm we want to use, and fall back if not |
| 33 | */ |
| 34 | public function check_cipher_and_fallback() { |
| 35 | |
| 36 | global $zbs; |
| 37 | |
| 38 | // check if has flipped fallback previously |
| 39 | $fallback_blocked = zeroBSCRM_getSetting( 'enc_fallback_blocked' ); |
| 40 | if ( ! empty( $fallback_blocked ) ) { |
| 41 | |
| 42 | // doesn't even have fallback. Non encrypting!! |
| 43 | $this->ready_to_encrypt = false; |
| 44 | |
| 45 | // error loading encryption |
| 46 | /* translators: %s: Encryption cipher method name. */ |
| 47 | echo zeroBSCRM_UI2_messageHTML( 'warning', __( 'Unable to load encryption method', 'zero-bs-crm' ), sprintf( __( 'CRM was unable to load the required encryption method (%s). Until this is method is available to your PHP your sensitive data may not be encrypted properly.', 'zero-bs-crm' ), $this->cipher ) ); |
| 48 | |
| 49 | return; |
| 50 | |
| 51 | } |
| 52 | |
| 53 | // check if has flipped fallback previously |
| 54 | $fallback_active = zeroBSCRM_getSetting( 'enc_fallback_active' ); |
| 55 | if ( ! empty( $fallback_active ) ) { |
| 56 | |
| 57 | // has fallback. Let's use that: |
| 58 | $this->cipher = $this->cipher_fallback; |
| 59 | return; |
| 60 | |
| 61 | } |
| 62 | |
| 63 | $available_cipher_methods = openssl_get_cipher_methods(); |
| 64 | |
| 65 | // check for our method |
| 66 | if ( ! in_array( $this->cipher, $available_cipher_methods ) ) { |
| 67 | |
| 68 | // try fallback |
| 69 | if ( in_array( $this->cipher_fallback, $available_cipher_methods ) ) { |
| 70 | |
| 71 | // has fallback. Let's use that: |
| 72 | $this->cipher = $this->cipher_fallback; |
| 73 | |
| 74 | // set option so we get 'stuck' in this mode |
| 75 | $zbs->settings->update( 'enc_fallback_active', $this->cipher ); |
| 76 | |
| 77 | } else { |
| 78 | |
| 79 | // neither method. Present error |
| 80 | $this->ready_to_encrypt = false; |
| 81 | |
| 82 | // set option so we get 'stuck' in this mode |
| 83 | $zbs->settings->update( 'enc_fallback_blocked', 1 ); |
| 84 | |
| 85 | // error loading encryption |
| 86 | /* translators: %s: Encryption cipher method name. */ |
| 87 | echo zeroBSCRM_UI2_messageHTML( 'warning', __( 'Unable to load encryption method', 'zero-bs-crm' ), sprintf( __( 'CRM was unable to load the required encryption method (%s). Until this is method is available to your PHP your sensitive data may not be encrypted properly.', 'zero-bs-crm' ), $this->cipher ) ); |
| 88 | |
| 89 | } |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | /* |
| 94 | * Ready to encrypt? |
| 95 | */ |
| 96 | public function ready_to_encrypt() { |
| 97 | |
| 98 | return $this->ready_to_encrypt; |
| 99 | } |
| 100 | |
| 101 | /* |
| 102 | * Cipher method |
| 103 | */ |
| 104 | public function cipher_method() { |
| 105 | |
| 106 | return $this->cipher; |
| 107 | } |
| 108 | |
| 109 | /* |
| 110 | * Encrypts a string |
| 111 | */ |
| 112 | public function encrypt( $data, $key = false ) { |
| 113 | |
| 114 | if ( $this->ready_to_encrypt ) { |
| 115 | |
| 116 | // retrieve encryption key (or default if false) |
| 117 | $encryption_key = $this->encryption_key( $key ); |
| 118 | |
| 119 | // encrypt |
| 120 | $iv_length = openssl_cipher_iv_length( $this->cipher ); |
| 121 | $iv = openssl_random_pseudo_bytes( $iv_length ); |
| 122 | $tag = ''; // will be filled by openssl_encrypt |
| 123 | |
| 124 | $encrypted = openssl_encrypt( $data, $this->cipher, $encryption_key, OPENSSL_RAW_DATA, $iv, $tag, '', $this->tag_length ); |
| 125 | |
| 126 | return base64_encode( $iv . $encrypted . $tag ); |
| 127 | |
| 128 | } else { |
| 129 | |
| 130 | // if we can't encrypt, store unencrypted, (having warned the user) |
| 131 | return $data; |
| 132 | |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | /* |
| 137 | * Decrypts a string |
| 138 | */ |
| 139 | public function decrypt( $encrypted_data, $key = false ) { |
| 140 | |
| 141 | if ( $this->ready_to_encrypt ) { |
| 142 | |
| 143 | // retrieve encryption key (or default if false) |
| 144 | $encryption_key = $this->encryption_key( $key ); |
| 145 | |
| 146 | // break up encrypted string into parts |
| 147 | $encrypted = base64_decode( $encrypted_data ); |
| 148 | $iv_len = openssl_cipher_iv_length( $this->cipher ); |
| 149 | $iv = substr( $encrypted, 0, $iv_len ); |
| 150 | $ciphertext = substr( $encrypted, $iv_len, -$this->tag_length ); |
| 151 | $tag = substr( $encrypted, -$this->tag_length ); |
| 152 | |
| 153 | return openssl_decrypt( $ciphertext, $this->cipher, $encryption_key, OPENSSL_RAW_DATA, $iv, $tag ); |
| 154 | |
| 155 | } else { |
| 156 | |
| 157 | // if we can't encrypt, store unencrypted, (having warned the user) |
| 158 | return $encrypted_data; |
| 159 | |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | /* |
| 164 | * Retrieves or generates an encryption key from data store |
| 165 | * |
| 166 | * @param string $key - a key to make an encryption key for |
| 167 | */ |
| 168 | public function get_encryption_key( $key ) { |
| 169 | |
| 170 | global $zbs; |
| 171 | |
| 172 | $encryption_key = zeroBSCRM_getSetting( 'enc_' . $key ); |
| 173 | if ( empty( $encryption_key ) ) { |
| 174 | |
| 175 | // Creating a 256 bit key. This might need to change if the algorithm changes |
| 176 | $encryption_key = openssl_random_pseudo_bytes( 32 ); |
| 177 | $zbs->settings->update( 'enc_' . $key, bin2hex( $encryption_key ) ); |
| 178 | |
| 179 | } else { |
| 180 | |
| 181 | $encryption_key = hex2bin( $encryption_key ); |
| 182 | |
| 183 | } |
| 184 | |
| 185 | return $encryption_key; |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * Retrieves default key |
| 190 | */ |
| 191 | public function get_default_encryption_key() { |
| 192 | |
| 193 | // cached? |
| 194 | if ( ! empty( $this->default_key ) ) { |
| 195 | |
| 196 | return $this->default_key; |
| 197 | |
| 198 | } |
| 199 | |
| 200 | // retrieve |
| 201 | $default_key = $this->get_encryption_key( 'jpcrm_core' ); |
| 202 | |
| 203 | // cache |
| 204 | $this->default_key = $default_key; |
| 205 | |
| 206 | return $default_key; |
| 207 | } |
| 208 | |
| 209 | /* |
| 210 | * Returns an encryption key, or default encryption key if no key passed |
| 211 | */ |
| 212 | public function encryption_key( $key ) { |
| 213 | |
| 214 | // retrieve encryption key |
| 215 | if ( ! empty( $key ) ) { |
| 216 | |
| 217 | // retrieve encryption key for $key |
| 218 | return $this->get_encryption_key( $key ); |
| 219 | |
| 220 | } else { |
| 221 | |
| 222 | // use default key |
| 223 | return $this->get_default_encryption_key(); |
| 224 | |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | /** |
| 229 | * Returns random hex string. The returned string length will be 2x the input bytes. |
| 230 | * |
| 231 | * Inspired by WooCommerce: wc_rand_hash() |
| 232 | * |
| 233 | * @param int $bytes - number of bytes to generate a hash from. |
| 234 | * |
| 235 | * @return string |
| 236 | */ |
| 237 | public function get_rand_hex( $bytes = 20 ) { |
| 238 | return bin2hex( openssl_random_pseudo_bytes( (int) $bytes ) ); |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * Returns hashed string. |
| 243 | * |
| 244 | * Inspired by WooCommerce: wc_api_hash() |
| 245 | * |
| 246 | * @param string $str - string to hash. |
| 247 | * |
| 248 | * @return string |
| 249 | */ |
| 250 | public function hash( $str ) { |
| 251 | return hash_hmac( 'sha256', $str, 'jpcrm' ); |
| 252 | } |
| 253 | } |