18984179626

Committed 31 Oct 2025 08:18PM UTC coverage: 39.551%. First build

Build # 18984179626

Build Type

Pull #5719

github

Committed by

web-flow

Commit Message

Merge c1201283f into 7b46c098c

Pull Request Pull Request #5719: fix: trust LibreSign cert when is a LibreSign file

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72.63

/lib/Handler/SignEngine/Pkcs12Handler.php

<?php

declare(strict_types=1);
/**
 * SPDX-FileCopyrightText: 2020-2024 LibreCode coop and contributors
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */

namespace OCA\Libresign\Handler\SignEngine;

use DateTime;
use OCA\Libresign\AppInfo\Application;
use OCA\Libresign\Exception\LibresignException;
use OCA\Libresign\Handler\CertificateEngine\CertificateEngineFactory;
use OCA\Libresign\Handler\CertificateEngine\OrderCertificatesTrait;
use OCA\Libresign\Handler\FooterHandler;
use OCA\Libresign\Service\FolderService;
use OCA\Libresign\Vendor\phpseclib3\File\ASN1;
use OCP\Files\File;
use OCP\IAppConfig;
use OCP\IL10N;
use OCP\ITempManager;
use Psr\Log\LoggerInterface;

class Pkcs12Handler extends SignEngineHandler {
        use OrderCertificatesTrait;
        protected string $certificate = '';
        private array $signaturesFromPoppler = [];
        private ?JSignPdfHandler $jSignPdfHandler = null;
        private string $rootCertificatePem = '';
        private bool $isLibreSignFile = false;

        public function __construct(
                private FolderService $folderService,
                private IAppConfig $appConfig,
                protected CertificateEngineFactory $certificateEngineFactory,
                private IL10N $l10n,
                private FooterHandler $footerHandler,
                private ITempManager $tempManager,
                private LoggerInterface $logger,
        ) {
                parent::__construct($l10n, $folderService, $logger);
        }

        /**
         * @throws LibresignException When is not a signed file
         */
        private function getSignatures($resource): iterable {
                rewind($resource);
                $content = stream_get_contents($resource);
                preg_match_all(
                        '/ByteRange\s*\[\s*(?<offset1>\d+)\s+(?<length1>\d+)\s+(?<offset2>\d+)\s+(?<length2>\d+)\s*\]/',
                        $content,
                        $bytes
                );
                if (empty($bytes['offset1']) || empty($bytes['length1']) || empty($bytes['offset2']) || empty($bytes['length2'])) {
                        throw new LibresignException($this->l10n->t('Unsigned file.'));
                }

                for ($i = 0; $i < count($bytes['offset1']); $i++) {
                        $offset1 = (int)$bytes['offset1'][$i];
                        $length1 = (int)$bytes['length1'][$i];
                        $offset2 = (int)$bytes['offset2'][$i];

                        $signatureStart = $offset1 + $length1 + 1;
                        $signatureLength = $offset2 - $signatureStart - 1;

                        rewind($resource);

                        $signature = stream_get_contents($resource, $signatureLength, $signatureStart);

                        yield hex2bin($signature);
                }

                $this->tempManager->clean();
        }

        public function setIsLibreSignFile(): void {
                $this->isLibreSignFile = true;
        }

        /**
         * @param resource $resource
         * @throws LibresignException When is not a signed file
         * @return array
         */
        #[\Override]
        public function getCertificateChain($resource): array {
                $certificates = [];

                foreach ($this->getSignatures($resource) as $signature) {
                        $certificates[] = $this->processSignature($resource, $signature);
                }
                return $certificates;
        }

        private function processSignature($resource, ?string $signature): array {
                $result = [];

                if (!$signature) {
                        $result['chain'][0]['signature_validation'] = $this->getReadableSigState('Digest Mismatch.');
                        return $result;
                }

                $decoded = ASN1::decodeBER($signature);
                $result = $this->extractTimestampData($decoded, $result);

                $chain = $this->extractCertificateChain($signature);
                if (!empty($chain)) {
                        $result['chain'] = $this->orderCertificates($chain);
                        $result = $this->enrichLeafWithPopplerData($resource, $result);
                }
                $result = $this->applyLibreSignRootCAFlag($result);
                return $result;
        }

        private function applyLibreSignRootCAFlag(array $signer): array {
                if (empty($signer['chain'])) {
                        return $signer;
                }

                foreach ($signer['chain'] as $key => $cert) {
                        if ($cert['isLibreSignRootCA']
                                && $cert['certificate_validation']['id'] !== 1
                        ) {
                                $signer['chain'][$key]['certificate_validation'] = [
                                        'id' => 1,
                                        'label' => $this->l10n->t('Certificate is trusted.'),
                                ];
                        }
                }

                return $signer;
        }

        private function extractTimestampData(array $decoded, array $result): array {
                $tsa = new TSA();

                try {
                        $timestampData = $tsa->extract($decoded);
                        if (!empty($timestampData['genTime']) || !empty($timestampData['policy']) || !empty($timestampData['serialNumber'])) {
                                $result['timestamp'] = $timestampData;
                        }
                } catch (\Throwable $e) {
                }

                if (!isset($result['signingTime']) || !$result['signingTime'] instanceof \DateTime) {
                        $result['signingTime'] = $tsa->getSigninTime($decoded);
                }
                return $result;
        }

        private function extractCertificateChain(string $signature): array {
                $pkcs7PemSignature = $this->der2pem($signature);
                $pemCertificates = [];

                if (!openssl_pkcs7_read($pkcs7PemSignature, $pemCertificates)) {
                        return [];
                }

                $chain = [];
                $isLibreSignRootCA = false;
                foreach ($pemCertificates as $index => $pemCertificate) {
                        $parsed = openssl_x509_parse($pemCertificate);
                        if ($parsed) {
                                $parsed['signature_validation'] = [
                                        'id' => 1,
                                        'label' => $this->l10n->t('Signature is valid.'),
                                ];
                                if (!$isLibreSignRootCA) {
                                        $isLibreSignRootCA = $this->isLibreSignRootCA($pemCertificate);
                                }
                                $parsed['isLibreSignRootCA'] = $isLibreSignRootCA;
                                $chain[$index] = $parsed;
                        }
                }
                if ($isLibreSignRootCA || $this->isLibreSignFile) {
                        foreach ($chain as &$cert) {
                                $cert['isLibreSignRootCA'] = true;
                        }
                }

                return $chain;
        }

        private function isLibreSignRootCA(string $certificate): bool {
                $rootCertificatePem = $this->getRootCertificatePem();
                if (empty($rootCertificatePem)) {
                        return false;
                }
                $rootFingerprint = openssl_x509_fingerprint($rootCertificatePem, 'sha256');
                $fingerprint = openssl_x509_fingerprint($certificate, 'sha256');
                return $rootFingerprint === $fingerprint;
        }

        private function getRootCertificatePem(): string {
                if (!empty($this->rootCertificatePem)) {
                        return $this->rootCertificatePem;
                }
                $configPath = $this->appConfig->getValueString(Application::APP_ID, 'config_path');
                if (empty($configPath)
                        || !is_dir($configPath)
                        || !is_readable($configPath . DIRECTORY_SEPARATOR . 'ca.pem')
                ) {
                        return '';
                }
                $rootCertificatePem = file_get_contents($configPath . DIRECTORY_SEPARATOR . 'ca.pem');
                if ($rootCertificatePem === false) {
                        return '';
                }
                $this->rootCertificatePem = $rootCertificatePem;
                return $this->rootCertificatePem;
        }

        private function enrichLeafWithPopplerData($resource, array $result): array {
                if (empty($result['chain'])) {
                        return $result;
                }

                $popplerOnlyFields = ['field', 'range', 'certificate_validation'];
                if (!isset($result['chain'][0]['subject'])) {
                        return $result;
                }
                $needPoppler = false;
                foreach ($popplerOnlyFields as $field) {
                        if (empty($result['chain'][0][$field])) {
                                $needPoppler = true;
                                break;
                        }
                }
                if (!isset($result['chain'][0]['signature_validation']) || $result['chain'][0]['signature_validation']['id'] !== 1) {
                        $needPoppler = true;
                }
                if (!$needPoppler) {
                        return $result;
                }
                $popplerChain = $this->chainFromPoppler($result['chain'][0]['subject'], $resource);
                if (empty($popplerChain)) {
                        return $result;
                }
                foreach ($popplerOnlyFields as $field) {
                        if (isset($popplerChain[$field])) {
                                $result['chain'][0][$field] = $popplerChain[$field];
                        }
                }
                if (!isset($result['chain'][0]['signature_validation']) || $result['chain'][0]['signature_validation']['id'] !== 1) {
                        if (isset($popplerChain['signature_validation'])) {
                                $result['chain'][0]['signature_validation'] = $popplerChain['signature_validation'];
                        }
                }
                return $result;
        }

        private function chainFromPoppler(array $subject, $resource): array {
                $fromFallback = $this->popplerUtilsPdfSignFallback($resource);
                foreach ($fromFallback as $popplerSig) {
                        if (!isset($popplerSig['chain'][0]['subject'])) {
                                continue;
                        }
                        if ($popplerSig['chain'][0]['subject'] == $subject) {
                                return $popplerSig['chain'][0];
                        }
                }
                return [];
        }

        private function popplerUtilsPdfSignFallback($resource): array {
                if (!empty($this->signaturesFromPoppler)) {
                        return $this->signaturesFromPoppler;
                }
                if (shell_exec('which pdfsig') === null) {
                        return $this->signaturesFromPoppler;
                }
                rewind($resource);
                $content = stream_get_contents($resource);
                $tempFile = $this->tempManager->getTemporaryFile('file.pdf');
                file_put_contents($tempFile, $content);

                $content = shell_exec('env TZ=UTC pdfsig ' . $tempFile);
                if (empty($content)) {
                        return $this->signaturesFromPoppler;
                }
                $lines = explode("\n", $content);

                $lastSignature = 0;
                foreach ($lines as $item) {
                        $isFirstLevel = preg_match('/^Signature\s#(\d)/', $item, $match);
                        if ($isFirstLevel) {
                                $lastSignature = (int)$match[1] - 1;
                                $this->signaturesFromPoppler[$lastSignature] = [];
                                continue;
                        }

                        $match = [];
                        $isSecondLevel = preg_match('/^\s+-\s(?<key>.+):\s(?<value>.*)/', $item, $match);
                        if ($isSecondLevel) {
                                switch ((string)$match['key']) {
                                        case 'Signing Time':
                                                $this->signaturesFromPoppler[$lastSignature]['signingTime'] = DateTime::createFromFormat('M d Y H:i:s', $match['value'], new \DateTimeZone('UTC'));
                                                break;
                                        case 'Signer full Distinguished Name':
                                                $this->signaturesFromPoppler[$lastSignature]['chain'][0]['subject'] = $this->parseDistinguishedNameWithMultipleValues($match['value']);
                                                $this->signaturesFromPoppler[$lastSignature]['chain'][0]['name'] = $match['value'];
                                                break;
                                        case 'Signing Hash Algorithm':
                                                $this->signaturesFromPoppler[$lastSignature]['chain'][0]['signatureTypeSN'] = $match['value'];
                                                break;
                                        case 'Signature Validation':
                                                $this->signaturesFromPoppler[$lastSignature]['chain'][0]['signature_validation'] = $this->getReadableSigState($match['value']);
                                                break;
                                        case 'Certificate Validation':
                                                $this->signaturesFromPoppler[$lastSignature]['chain'][0]['certificate_validation'] = $this->getReadableCertState($match['value']);
                                                break;
                                        case 'Signed Ranges':
                                                if (preg_match('/\[(\d+) - (\d+)\], \[(\d+) - (\d+)\]/', $match['value'], $ranges)) {
                                                        $this->signaturesFromPoppler[$lastSignature]['chain'][0]['range'] = [
                                                                'offset1' => (int)$ranges[1],
                                                                'length1' => (int)$ranges[2],
                                                                'offset2' => (int)$ranges[3],
                                                                'length2' => (int)$ranges[4],
                                                        ];
                                                }
                                                break;
                                        case 'Signature Field Name':
                                                $this->signaturesFromPoppler[$lastSignature]['chain'][0]['field'] = $match['value'];
                                                break;
                                        case 'Signature Validation':
                                        case 'Signature Type':
                                        case 'Total document signed':
                                        case 'Not total document signed':
                                        default:
                                                break;
                                }
                        }
                }
                return $this->signaturesFromPoppler;
        }

        private function getReadableSigState(string $status) {
                return match ($status) {
                        'Signature is Valid.' => [
                                'id' => 1,
                                'label' => $this->l10n->t('Signature is valid.'),
                        ],
                        'Signature is Invalid.' => [
                                'id' => 2,
                                'label' => $this->l10n->t('Signature is invalid.'),
                        ],
                        'Digest Mismatch.' => [
                                'id' => 3,
                                'label' => $this->l10n->t('Digest mismatch.'),
                        ],
                        "Document isn't signed or corrupted data." => [
                                'id' => 4,
                                'label' => $this->l10n->t("Document isn't signed or corrupted data."),
                        ],
                        'Signature has not yet been verified.' => [
                                'id' => 5,
                                'label' => $this->l10n->t('Signature has not yet been verified.'),
                        ],
                        default => [
                                'id' => 6,
                                'label' => $this->l10n->t('Unknown validation failure.'),
                        ],
                };
        }


        private function getReadableCertState(string $status) {
                return match ($status) {
                        'Certificate is Trusted.' => [
                                'id' => 1,
                                'label' => $this->l10n->t('Certificate is trusted.'),
                        ],
                        "Certificate issuer isn't Trusted." => [
                                'id' => 2,
                                'label' => $this->l10n->t("Certificate issuer isn't trusted."),
                        ],
                        'Certificate issuer is unknown.' => [
                                'id' => 3,
                                'label' => $this->l10n->t('Certificate issuer is unknown.'),
                        ],
                        'Certificate has been Revoked.' => [
                                'id' => 4,
                                'label' => $this->l10n->t('Certificate has been revoked.'),
                        ],
                        'Certificate has Expired' => [
                                'id' => 5,
                                'label' => $this->l10n->t('Certificate has expired'),
                        ],
                        'Certificate has not yet been verified.' => [
                                'id' => 6,
                                'label' => $this->l10n->t('Certificate has not yet been verified.'),
                        ],
                        default => [
                                'id' => 7,
                                'label' => $this->l10n->t('Unknown issue with Certificate or corrupted data.')
                        ],
                };
        }


        private function parseDistinguishedNameWithMultipleValues(string $dn): array {
                $result = [];
                $pairs = preg_split('/,(?=(?:[^"]*"[^"]*")*[^"]*$)/', $dn);

                foreach ($pairs as $pair) {
                        [$key, $value] = explode('=', $pair, 2);
                        if (empty($key) || empty($value)) {
                                return $result;
                        }
                        $key = trim($key);
                        $value = trim($value);
                        $value = trim($value, '"');

                        if (!isset($result[$key])) {
                                $result[$key] = $value;
                        } else {
                                if (!is_array($result[$key])) {
                                        $result[$key] = [$result[$key]];
                                }
                                $result[$key][] = $value;
                        }
                }

                return $result;
        }

        private function der2pem($derData) {
                $pem = chunk_split(base64_encode((string)$derData), 64, "\n");
                $pem = "-----BEGIN CERTIFICATE-----\n" . $pem . "-----END CERTIFICATE-----\n";
                return $pem;
        }

        private function getHandler(): SignEngineHandler {
                $sign_engine = $this->appConfig->getValueString(Application::APP_ID, 'sign_engine', 'JSignPdf');
                $property = lcfirst($sign_engine) . 'Handler';
                if (!property_exists($this, $property)) {
                        throw new LibresignException($this->l10n->t('Invalid Sign engine.'), 400);
                }
                $classHandler = 'OCA\\Libresign\\Handler\\SignEngine\\' . ucfirst($property);
                if (!$this->$property instanceof $classHandler) {
                        $this->$property = \OCP\Server::get($classHandler);
                }
                return $this->$property;
        }

        #[\Override]
        public function sign(): File {
                $signedContent = $this->getHandler()
                        ->setCertificate($this->getCertificate())
                        ->setInputFile($this->getInputFile())
                        ->setPassword($this->getPassword())
                        ->setSignatureParams($this->getSignatureParams())
                        ->setVisibleElements($this->getVisibleElements())
                        ->getSignedContent();
                $this->getInputFile()->putContent($signedContent);
                return $this->getInputFile();
        }

        public function isHandlerOk(): bool {
                return $this->certificateEngineFactory->getEngine()->isSetupOk();
        }
}

1	<?php
2
3	declare(strict_types=1);
4	/**
5	* SPDX-FileCopyrightText: 2020-2024 LibreCode coop and contributors
6	* SPDX-License-Identifier: AGPL-3.0-or-later
7	*/
8
9	namespace OCA\Libresign\Handler\SignEngine;
10
11	use DateTime;
12	use OCA\Libresign\AppInfo\Application;
13	use OCA\Libresign\Exception\LibresignException;
14	use OCA\Libresign\Handler\CertificateEngine\CertificateEngineFactory;
15	use OCA\Libresign\Handler\CertificateEngine\OrderCertificatesTrait;
16	use OCA\Libresign\Handler\FooterHandler;
17	use OCA\Libresign\Service\FolderService;
18	use OCA\Libresign\Vendor\phpseclib3\File\ASN1;
19	use OCP\Files\File;
20	use OCP\IAppConfig;
21	use OCP\IL10N;
22	use OCP\ITempManager;
23	use Psr\Log\LoggerInterface;
24
25	class Pkcs12Handler extends SignEngineHandler {
26	use OrderCertificatesTrait;
27	protected string $certificate = '';
28	private array $signaturesFromPoppler = [];
29	private ?JSignPdfHandler $jSignPdfHandler = null;
30	private string $rootCertificatePem = '';
31	private bool $isLibreSignFile = false;
32
33	public function __construct(
34	private FolderService $folderService,
35	private IAppConfig $appConfig,
36	protected CertificateEngineFactory $certificateEngineFactory,
37	private IL10N $l10n,
38	private FooterHandler $footerHandler,
39	private ITempManager $tempManager,
40	private LoggerInterface $logger,
41	) {
42	parent::__construct($l10n, $folderService, $logger);	51✔
43	}
44
45	/**
46	* @throws LibresignException When is not a signed file
47	*/
48	private function getSignatures($resource): iterable {
49	rewind($resource);	6✔
50	$content = stream_get_contents($resource);	6✔
51	preg_match_all(	6✔
52	'/ByteRange\s\[\s(?<offset1>\d+)\s+(?<length1>\d+)\s+(?<offset2>\d+)\s+(?<length2>\d+)\s*\]/',	6✔
53	$content,	6✔
54	$bytes	6✔
55	);	6✔
56	if (empty($bytes['offset1']) \|\| empty($bytes['length1']) \|\| empty($bytes['offset2']) \|\| empty($bytes['length2'])) {	6✔
57	throw new LibresignException($this->l10n->t('Unsigned file.'));	4✔
58	}
59
60	for ($i = 0; $i < count($bytes['offset1']); $i++) {	2✔
61	$offset1 = (int)$bytes['offset1'][$i];	2✔
62	$length1 = (int)$bytes['length1'][$i];	2✔
63	$offset2 = (int)$bytes['offset2'][$i];	2✔
64
65	$signatureStart = $offset1 + $length1 + 1;	2✔
66	$signatureLength = $offset2 - $signatureStart - 1;	2✔
67
68	rewind($resource);	2✔
69
70	$signature = stream_get_contents($resource, $signatureLength, $signatureStart);	2✔
71
72	yield hex2bin($signature);	2✔
73	}
74
75	$this->tempManager->clean();	2✔
76	}
77
78	public function setIsLibreSignFile(): void {
NEW 79	$this->isLibreSignFile = true;	×
80	}
81
82	/**
83	* @param resource $resource
84	* @throws LibresignException When is not a signed file
85	* @return array
86	*/
87	#[\Override]
88	public function getCertificateChain($resource): array {
89	$certificates = [];	6✔
90
91	foreach ($this->getSignatures($resource) as $signature) {	6✔
92	$certificates[] = $this->processSignature($resource, $signature);	2✔
93	}
94	return $certificates;	2✔
95	}
96
97	private function processSignature($resource, ?string $signature): array {
98	$result = [];	2✔
99
100	if (!$signature) {	2✔
101	$result['chain'][0]['signature_validation'] = $this->getReadableSigState('Digest Mismatch.');	×
102	return $result;	×
103	}
104
105	$decoded = ASN1::decodeBER($signature);	2✔
106	$result = $this->extractTimestampData($decoded, $result);	2✔
107
108	$chain = $this->extractCertificateChain($signature);	2✔
109	if (!empty($chain)) {	2✔
110	$result['chain'] = $this->orderCertificates($chain);	2✔
111	$result = $this->enrichLeafWithPopplerData($resource, $result);	2✔
112	}
113	$result = $this->applyLibreSignRootCAFlag($result);	2✔
114	return $result;	2✔
115	}
116
117	private function applyLibreSignRootCAFlag(array $signer): array {
118	if (empty($signer['chain'])) {	2✔
119	return $signer;	×
120	}
121
122	foreach ($signer['chain'] as $key => $cert) {	2✔
123	if ($cert['isLibreSignRootCA']	2✔
124	&& $cert['certificate_validation']['id'] !== 1	2✔
125	) {
126	$signer['chain'][$key]['certificate_validation'] = [	×
127	'id' => 1,	×
128	'label' => $this->l10n->t('Certificate is trusted.'),	×
129	];	×
130	}
131	}
132
133	return $signer;	2✔
134	}
135
136	private function extractTimestampData(array $decoded, array $result): array {
137	$tsa = new TSA();	2✔
138
139	try {
140	$timestampData = $tsa->extract($decoded);	2✔
141	if (!empty($timestampData['genTime']) \|\| !empty($timestampData['policy']) \|\| !empty($timestampData['serialNumber'])) {	2✔
142	$result['timestamp'] = $timestampData;	2✔
143	}
144	} catch (\Throwable $e) {	×
145	}
146
147	if (!isset($result['signingTime']) \|\| !$result['signingTime'] instanceof \DateTime) {	2✔
148	$result['signingTime'] = $tsa->getSigninTime($decoded);	2✔
149	}
150	return $result;	2✔
151	}
152
153	private function extractCertificateChain(string $signature): array {
154	$pkcs7PemSignature = $this->der2pem($signature);	2✔
155	$pemCertificates = [];	2✔
156
157	if (!openssl_pkcs7_read($pkcs7PemSignature, $pemCertificates)) {	2✔
158	return [];	×
159	}
160
161	$chain = [];	2✔
162	$isLibreSignRootCA = false;	2✔
163	foreach ($pemCertificates as $index => $pemCertificate) {	2✔
164	$parsed = openssl_x509_parse($pemCertificate);	2✔
165	if ($parsed) {	2✔
166	$parsed['signature_validation'] = [	2✔
167	'id' => 1,	2✔
168	'label' => $this->l10n->t('Signature is valid.'),	2✔
169	];	2✔
170	if (!$isLibreSignRootCA) {	2✔
171	$isLibreSignRootCA = $this->isLibreSignRootCA($pemCertificate);	2✔
172	}
173	$parsed['isLibreSignRootCA'] = $isLibreSignRootCA;	2✔
174	$chain[$index] = $parsed;	2✔
175	}
176	}
177	if ($isLibreSignRootCA \|\| $this->isLibreSignFile) {	2✔
NEW 178	foreach ($chain as &$cert) {	×
179	$cert['isLibreSignRootCA'] = true;	×
180	}
181	}
182
183	return $chain;	2✔
184	}
185
186	private function isLibreSignRootCA(string $certificate): bool {
187	$rootCertificatePem = $this->getRootCertificatePem();	2✔
188	if (empty($rootCertificatePem)) {	2✔
189	return false;	2✔
190	}
191	$rootFingerprint = openssl_x509_fingerprint($rootCertificatePem, 'sha256');	×
192	$fingerprint = openssl_x509_fingerprint($certificate, 'sha256');	×
193	return $rootFingerprint === $fingerprint;	×
194	}
195
196	private function getRootCertificatePem(): string {
197	if (!empty($this->rootCertificatePem)) {	2✔
198	return $this->rootCertificatePem;	×
199	}
200	$configPath = $this->appConfig->getValueString(Application::APP_ID, 'config_path');	2✔
201	if (empty($configPath)	2✔
202	\|\| !is_dir($configPath)	2✔
203	\|\| !is_readable($configPath . DIRECTORY_SEPARATOR . 'ca.pem')	2✔
204	) {
205	return '';	2✔
206	}
207	$rootCertificatePem = file_get_contents($configPath . DIRECTORY_SEPARATOR . 'ca.pem');	×
208	if ($rootCertificatePem === false) {	×
209	return '';	×
210	}
211	$this->rootCertificatePem = $rootCertificatePem;	×
212	return $this->rootCertificatePem;	×
213	}
214
215	private function enrichLeafWithPopplerData($resource, array $result): array {
216	if (empty($result['chain'])) {	2✔
217	return $result;	×
218	}
219
220	$popplerOnlyFields = ['field', 'range', 'certificate_validation'];	2✔
221	if (!isset($result['chain'][0]['subject'])) {	2✔
222	return $result;	×
223	}
224	$needPoppler = false;	2✔
225	foreach ($popplerOnlyFields as $field) {	2✔
226	if (empty($result['chain'][0][$field])) {	2✔
227	$needPoppler = true;	2✔
228	break;	2✔
229	}
230	}
231	if (!isset($result['chain'][0]['signature_validation']) \|\| $result['chain'][0]['signature_validation']['id'] !== 1) {	2✔
232	$needPoppler = true;	×
233	}
234	if (!$needPoppler) {	2✔
235	return $result;	×
236	}
237	$popplerChain = $this->chainFromPoppler($result['chain'][0]['subject'], $resource);	2✔
238	if (empty($popplerChain)) {	2✔
239	return $result;	×
240	}
241	foreach ($popplerOnlyFields as $field) {	2✔
242	if (isset($popplerChain[$field])) {	2✔
243	$result['chain'][0][$field] = $popplerChain[$field];	2✔
244	}
245	}
246	if (!isset($result['chain'][0]['signature_validation']) \|\| $result['chain'][0]['signature_validation']['id'] !== 1) {	2✔
247	if (isset($popplerChain['signature_validation'])) {	×
248	$result['chain'][0]['signature_validation'] = $popplerChain['signature_validation'];	×
249	}
250	}
251	return $result;	2✔
252	}
253
254	private function chainFromPoppler(array $subject, $resource): array {
255	$fromFallback = $this->popplerUtilsPdfSignFallback($resource);	2✔
256	foreach ($fromFallback as $popplerSig) {	2✔
257	if (!isset($popplerSig['chain'][0]['subject'])) {	2✔
258	continue;	×
259	}
260	if ($popplerSig['chain'][0]['subject'] == $subject) {	2✔
261	return $popplerSig['chain'][0];	2✔
262	}
263	}
264	return [];	×
265	}
266
267	private function popplerUtilsPdfSignFallback($resource): array {
268	if (!empty($this->signaturesFromPoppler)) {	2✔
269	return $this->signaturesFromPoppler;	1✔
270	}
271	if (shell_exec('which pdfsig') === null) {	1✔
272	return $this->signaturesFromPoppler;	×
273	}
274	rewind($resource);	1✔
275	$content = stream_get_contents($resource);	1✔
276	$tempFile = $this->tempManager->getTemporaryFile('file.pdf');	1✔
277	file_put_contents($tempFile, $content);	1✔
278
279	$content = shell_exec('env TZ=UTC pdfsig ' . $tempFile);	1✔
280	if (empty($content)) {	1✔
281	return $this->signaturesFromPoppler;	×
282	}
283	$lines = explode("\n", $content);	1✔
284
285	$lastSignature = 0;	1✔
286	foreach ($lines as $item) {	1✔
287	$isFirstLevel = preg_match('/^Signature\s#(\d)/', $item, $match);	1✔
288	if ($isFirstLevel) {	1✔
289	$lastSignature = (int)$match[1] - 1;	1✔
290	$this->signaturesFromPoppler[$lastSignature] = [];	1✔
291	continue;	1✔
292	}
293
294	$match = [];	1✔
295	$isSecondLevel = preg_match('/^\s+-\s(?<key>.+):\s(?<value>.*)/', $item, $match);	1✔
296	if ($isSecondLevel) {	1✔
297	switch ((string)$match['key']) {	1✔
298	case 'Signing Time':	1✔
299	$this->signaturesFromPoppler[$lastSignature]['signingTime'] = DateTime::createFromFormat('M d Y H:i:s', $match['value'], new \DateTimeZone('UTC'));	1✔
300	break;	1✔
301	case 'Signer full Distinguished Name':	1✔
302	$this->signaturesFromPoppler[$lastSignature]['chain'][0]['subject'] = $this->parseDistinguishedNameWithMultipleValues($match['value']);	1✔
303	$this->signaturesFromPoppler[$lastSignature]['chain'][0]['name'] = $match['value'];	1✔
304	break;	1✔
305	case 'Signing Hash Algorithm':	1✔
306	$this->signaturesFromPoppler[$lastSignature]['chain'][0]['signatureTypeSN'] = $match['value'];	1✔
307	break;	1✔
308	case 'Signature Validation':	1✔
309	$this->signaturesFromPoppler[$lastSignature]['chain'][0]['signature_validation'] = $this->getReadableSigState($match['value']);	1✔
310	break;	1✔
311	case 'Certificate Validation':	1✔
312	$this->signaturesFromPoppler[$lastSignature]['chain'][0]['certificate_validation'] = $this->getReadableCertState($match['value']);	1✔
313	break;	1✔
314	case 'Signed Ranges':	1✔
315	if (preg_match('/\[(\d+) - (\d+)\], \[(\d+) - (\d+)\]/', $match['value'], $ranges)) {	1✔
316	$this->signaturesFromPoppler[$lastSignature]['chain'][0]['range'] = [	1✔
317	'offset1' => (int)$ranges[1],	1✔
318	'length1' => (int)$ranges[2],	1✔
319	'offset2' => (int)$ranges[3],	1✔
320	'length2' => (int)$ranges[4],	1✔
321	];	1✔
322	}
323	break;	1✔
324	case 'Signature Field Name':	1✔
325	$this->signaturesFromPoppler[$lastSignature]['chain'][0]['field'] = $match['value'];	1✔
326	break;	1✔
327	case 'Signature Validation':	1✔
328	case 'Signature Type':	1✔
329	case 'Total document signed':	1✔
330	case 'Not total document signed':	1✔
331	default:
332	break;	1✔
333	}
334	}
335	}
336	return $this->signaturesFromPoppler;	1✔
337	}
338
339	private function getReadableSigState(string $status) {
340	return match ($status) {	1✔
341	'Signature is Valid.' => [	1✔
342	'id' => 1,	1✔
343	'label' => $this->l10n->t('Signature is valid.'),	1✔
344	],	1✔
345	'Signature is Invalid.' => [	×
346	'id' => 2,	×
347	'label' => $this->l10n->t('Signature is invalid.'),	×
348	],	×
349	'Digest Mismatch.' => [	×
350	'id' => 3,	×
351	'label' => $this->l10n->t('Digest mismatch.'),	×
352	],	×
353	"Document isn't signed or corrupted data." => [	×
354	'id' => 4,	×
355	'label' => $this->l10n->t("Document isn't signed or corrupted data."),	×
356	],	×
357	'Signature has not yet been verified.' => [	×
358	'id' => 5,	×
359	'label' => $this->l10n->t('Signature has not yet been verified.'),	×
360	],	×
361	default => [	1✔
362	'id' => 6,	1✔
363	'label' => $this->l10n->t('Unknown validation failure.'),	1✔
364	],	1✔
365	};	1✔
366	}
367
368
369	private function getReadableCertState(string $status) {
370	return match ($status) {	1✔
371	'Certificate is Trusted.' => [	×
372	'id' => 1,	×
373	'label' => $this->l10n->t('Certificate is trusted.'),	×
374	],	×
375	"Certificate issuer isn't Trusted." => [	×
376	'id' => 2,	×
377	'label' => $this->l10n->t("Certificate issuer isn't trusted."),	×
378	],	×
379	'Certificate issuer is unknown.' => [	1✔
380	'id' => 3,	1✔
381	'label' => $this->l10n->t('Certificate issuer is unknown.'),	1✔
382	],	1✔
383	'Certificate has been Revoked.' => [	×
384	'id' => 4,	×
385	'label' => $this->l10n->t('Certificate has been revoked.'),	×
386	],	×
387	'Certificate has Expired' => [	×
388	'id' => 5,	×
389	'label' => $this->l10n->t('Certificate has expired'),	×
390	],	×
391	'Certificate has not yet been verified.' => [	×
392	'id' => 6,	×
393	'label' => $this->l10n->t('Certificate has not yet been verified.'),	×
394	],	×
395	default => [	1✔
396	'id' => 7,	1✔
397	'label' => $this->l10n->t('Unknown issue with Certificate or corrupted data.')	1✔
398	],	1✔
399	};	1✔
400	}
401
402
403	private function parseDistinguishedNameWithMultipleValues(string $dn): array {
404	$result = [];	1✔
405	$pairs = preg_split('/,(?=(?:[^"]"[^"]")[^"]$)/', $dn);	1✔
406
407	foreach ($pairs as $pair) {	1✔
408	[$key, $value] = explode('=', $pair, 2);	1✔
409	if (empty($key) \|\| empty($value)) {	1✔
410	return $result;	×
411	}
412	$key = trim($key);	1✔
413	$value = trim($value);	1✔
414	$value = trim($value, '"');	1✔
415
416	if (!isset($result[$key])) {	1✔
417	$result[$key] = $value;	1✔
418	} else {
419	if (!is_array($result[$key])) {	×
420	$result[$key] = [$result[$key]];	×
421	}
422	$result[$key][] = $value;	×
423	}
424	}
425
426	return $result;	1✔
427	}
428
429	private function der2pem($derData) {
430	$pem = chunk_split(base64_encode((string)$derData), 64, "\n");	2✔
431	$pem = "-----BEGIN CERTIFICATE-----\n" . $pem . "-----END CERTIFICATE-----\n";	2✔
432	return $pem;	2✔
433	}
434
435	private function getHandler(): SignEngineHandler {
436	$sign_engine = $this->appConfig->getValueString(Application::APP_ID, 'sign_engine', 'JSignPdf');	1✔
437	$property = lcfirst($sign_engine) . 'Handler';	1✔
438	if (!property_exists($this, $property)) {	1✔
439	throw new LibresignException($this->l10n->t('Invalid Sign engine.'), 400);	×
440	}
441	$classHandler = 'OCA\\Libresign\\Handler\\SignEngine\\' . ucfirst($property);	1✔
442	if (!$this->$property instanceof $classHandler) {	1✔
443	$this->$property = \OCP\Server::get($classHandler);	1✔
444	}
445	return $this->$property;	1✔
446	}
447
448	#[\Override]
449	public function sign(): File {
450	$signedContent = $this->getHandler()	1✔
451	->setCertificate($this->getCertificate())	1✔
452	->setInputFile($this->getInputFile())	1✔
453	->setPassword($this->getPassword())	1✔
454	->setSignatureParams($this->getSignatureParams())	1✔
455	->setVisibleElements($this->getVisibleElements())	1✔
456	->getSignedContent();	1✔
457	$this->getInputFile()->putContent($signedContent);	×
458	return $this->getInputFile();	×
459	}
460
461	public function isHandlerOk(): bool {
462	return $this->certificateEngineFactory->getEngine()->isSetupOk();	1✔
463	}
464	}

LibreSign / libresign / 18984179626

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