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<?php
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/*
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* crypt.inc
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*
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* part of pfSense (https://www.pfsense.org)
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* Copyright (c) 2008-2019 Rubicon Communications, LLC (Netgate)
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* Copyright (c) 2008 Shrew Soft Inc. All rights reserved.
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* All rights reserved.
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*
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* originally part of m0n0wall (http://m0n0.ch/wall)
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* Copyright (c) 2003-2004 Manuel Kasper <mk@neon1.net>.
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* All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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function crypt_data($val, $pass, $opt, $legacy = false) {
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$file = tempnam("/tmp", "php-encrypt");
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/* Ensure the files do not already exist */
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unlink_if_exists($file);
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unlink_if_exists("{$file}.dec");
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unlink_if_exists("{$file}.enc");
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file_put_contents("{$file}.dec", $val);
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/* Use PBKDF2 Key Derivation (https://en.wikipedia.org/wiki/PBKDF2)
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* unless we need to read old data encrypted without it. */
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$keyder = ($legacy) ? "" : "-pbkdf2";
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$output = "";
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$exitcode = "";
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exec("/usr/bin/openssl enc {$opt} -aes-256-cbc -in {$file}.dec -out {$file}.enc -pass pass:" . escapeshellarg($pass) . " -salt -md sha256 {$keyder} 2> /dev/null", $output, $exitcode);
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if (($exitcode == 0) && file_exists("{$file}.enc") && (filesize("{$file}.enc") > 0)) {
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$result = file_get_contents("{$file}.enc");
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} elseif ($legacy === false) {
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/* Operation failed without new options, try old. */
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$result = crypt_data($val, $pass, $opt, true);
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} else {
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$result = "";
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log_error(gettext("Failed to encrypt/decrypt data!"));
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}
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/* Cleanup */
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unlink_if_exists($file);
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unlink_if_exists("{$file}.dec");
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unlink_if_exists("{$file}.enc");
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return $result;
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}
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function encrypt_data(& $data, $pass, $legacy = false) {
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return base64_encode(crypt_data($data, $pass, "-e", $legacy));
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}
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function decrypt_data(& $data, $pass, $legacy = false) {
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return crypt_data(base64_decode($data), $pass, "-d", $legacy);
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}
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function tagfile_reformat($in, & $out, $tag) {
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$out = "---- BEGIN {$tag} ----\n";
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$size = 80;
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$oset = 0;
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while ($size >= 64) {
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$line = substr($in, $oset, 64);
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$out .= $line."\n";
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$size = strlen($line);
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$oset += $size;
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}
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$out .= "---- END {$tag} ----\n";
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return true;
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}
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function tagfile_deformat($in, & $out, $tag) {
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$btag_val = "---- BEGIN {$tag} ----";
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$etag_val = "---- END {$tag} ----";
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$btag_len = strlen($btag_val);
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$etag_len = strlen($etag_val);
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$btag_pos = stripos($in, $btag_val);
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$etag_pos = stripos($in, $etag_val);
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if (($btag_pos === false) || ($etag_pos === false)) {
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return false;
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}
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$body_pos = $btag_pos + $btag_len;
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$body_len = strlen($in);
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$body_len -= $btag_len;
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$body_len -= $etag_len + 1;
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$out = substr($in, $body_pos, $body_len);
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return true;
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}
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?>
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