19860846804

Committed 02 Dec 2025 01:48PM UTC coverage: 40.769%. First build

Build # 19860846804

Build Type

Pull #5916

github

Committed by

web-flow

Commit Message

Merge a76827235 into d5be546c9

Pull Request Pull Request #5916: fix: handle corrupted signature data

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70.27

/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\CaIdentifierService;
use OCA\Libresign\Service\FolderService;
use OCP\Files\File;
use OCP\IAppConfig;
use OCP\IL10N;
use OCP\ITempManager;
use phpseclib3\File\ASN1;
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,
                private CaIdentifierService $caIdentifierService,
        ) {
                parent::__construct($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, $signatureStart);
                        if ($signature === false) {
                                yield null;
                                continue;
                        }

                        $decodedSignature = @hex2bin($signature);
                        if ($decodedSignature === false) {
                                yield null;
                                continue;
                        }
                        yield $decodedSignature;
                }

                $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;
                $certificateEngine = $this->getCertificateEngine();

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

                return $chain;
        }

        private function isLibreSignRootCA(string $certificate, array $parsed): bool {
                $rootCertificatePem = $this->getRootCertificatePem();
                if (empty($rootCertificatePem)) {
                        return false;
                }

                $rootFingerprint = openssl_x509_fingerprint($rootCertificatePem, 'sha256');
                $fingerprint = openssl_x509_fingerprint($certificate, 'sha256');
                if ($rootFingerprint === $fingerprint) {
                        return true;
                }

                return $this->hasLibreSignCaId($parsed);
        }

        private function hasLibreSignCaId(array $parsed): bool {
                $instanceId = $this->appConfig->getValueString(Application::APP_ID, 'instance_id', '');
                if (strlen($instanceId) !== 10 || !isset($parsed['subject']['OU'])) {
                        return false;
                }

                $organizationalUnits = $parsed['subject']['OU'];
                if (is_string($organizationalUnits)) {
                        $organizationalUnits = [$organizationalUnits];
                }

                foreach ($organizationalUnits as $ou) {
                        $ou = trim($ou);
                        if ($this->caIdentifierService->isValidCaId($ou, $instanceId)) {
                                return true;
                        }
                }

                return false;
        }

        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 {
                $this->beforeSign();

                $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\CaIdentifierService;
18	use OCA\Libresign\Service\FolderService;
19	use OCP\Files\File;
20	use OCP\IAppConfig;
21	use OCP\IL10N;
22	use OCP\ITempManager;
23	use phpseclib3\File\ASN1;
24	use Psr\Log\LoggerInterface;
25
26	class Pkcs12Handler extends SignEngineHandler {
27	use OrderCertificatesTrait;
28	protected string $certificate = '';
29	private array $signaturesFromPoppler = [];
30	private ?JSignPdfHandler $jSignPdfHandler = null;
31	private string $rootCertificatePem = '';
32	private bool $isLibreSignFile = false;
33
34	public function __construct(
35	private FolderService $folderService,
36	private IAppConfig $appConfig,
37	protected CertificateEngineFactory $certificateEngineFactory,
38	private IL10N $l10n,
39	private FooterHandler $footerHandler,
40	private ITempManager $tempManager,
41	private LoggerInterface $logger,
42	private CaIdentifierService $caIdentifierService,
43	) {
44	parent::__construct($l10n, $folderService, $logger);	52✔
45	}
46
47	/**
48	* @throws LibresignException When is not a signed file
49	*/
50	private function getSignatures($resource): iterable {
51	rewind($resource);	7✔
52	$content = stream_get_contents($resource);	7✔
53	preg_match_all(	7✔
54	'/ByteRange\s\[\s(?<offset1>\d+)\s+(?<length1>\d+)\s+(?<offset2>\d+)\s+(?<length2>\d+)\s*\]/',	7✔
55	$content,	7✔
56	$bytes	7✔
57	);	7✔
58	if (empty($bytes['offset1']) \|\| empty($bytes['length1']) \|\| empty($bytes['offset2']) \|\| empty($bytes['length2'])) {	7✔
59	throw new LibresignException($this->l10n->t('Unsigned file.'));	4✔
60	}
61
62	for ($i = 0; $i < count($bytes['offset1']); $i++) {	3✔
63	$offset1 = (int)$bytes['offset1'][$i];	3✔
64	$length1 = (int)$bytes['length1'][$i];	3✔
65	$offset2 = (int)$bytes['offset2'][$i];	3✔
66
67	$signatureStart = $offset1 + $length1 + 1;	3✔
68	$signatureLength = $offset2 - $signatureStart - 1;	3✔
69
70	rewind($resource);	3✔
71
72	$signature = stream_get_contents($resource, $signatureLength, $signatureStart);	3✔
73	if ($signature === false) {	3✔
NEW 74	yield null;	×
NEW 75	continue;	×
76	}
77
78	$decodedSignature = @hex2bin($signature);	3✔
79	if ($decodedSignature === false) {	3✔
80	yield null;	1✔
81	continue;	1✔
82	}
83	yield $decodedSignature;	2✔
84	}
85
86	$this->tempManager->clean();	3✔
87	}
88
89	public function setIsLibreSignFile(): void {
90	$this->isLibreSignFile = true;	×
91	}
92
93	/**
94	* @param resource $resource
95	* @throws LibresignException When is not a signed file
96	* @return array
97	*/
98	#[\Override]
99	public function getCertificateChain($resource): array {
100	$certificates = [];	7✔
101
102	foreach ($this->getSignatures($resource) as $signature) {	7✔
103	$certificates[] = $this->processSignature($resource, $signature);	3✔
104	}
105	return $certificates;	3✔
106	}
107
108	private function processSignature($resource, ?string $signature): array {
109	$result = [];	3✔
110
111	if (!$signature) {	3✔
112	$result['chain'][0]['signature_validation'] = $this->getReadableSigState('Digest Mismatch.');	1✔
113	return $result;	1✔
114	}
115
116	$decoded = ASN1::decodeBER($signature);	2✔
117	$result = $this->extractTimestampData($decoded, $result);	2✔
118
119	$chain = $this->extractCertificateChain($signature);	2✔
120	if (!empty($chain)) {	2✔
121	$result['chain'] = $this->orderCertificates($chain);	2✔
122	$result = $this->enrichLeafWithPopplerData($resource, $result);	2✔
123	}
124	$result = $this->applyLibreSignRootCAFlag($result);	2✔
125	return $result;	2✔
126	}
127
128	private function applyLibreSignRootCAFlag(array $signer): array {
129	if (empty($signer['chain'])) {	2✔
130	return $signer;	×
131	}
132
133	foreach ($signer['chain'] as $key => $cert) {	2✔
134	if ($cert['isLibreSignRootCA']	2✔
135	&& $cert['certificate_validation']['id'] !== 1	2✔
136	) {
137	$signer['chain'][$key]['certificate_validation'] = [	×
138	'id' => 1,	×
139	'label' => $this->l10n->t('Certificate is trusted.'),	×
140	];	×
141	}
142	}
143
144	return $signer;	2✔
145	}
146
147	private function extractTimestampData(array $decoded, array $result): array {
148	$tsa = new TSA();	2✔
149
150	try {
151	$timestampData = $tsa->extract($decoded);	2✔
152	if (!empty($timestampData['genTime']) \|\| !empty($timestampData['policy']) \|\| !empty($timestampData['serialNumber'])) {	2✔
153	$result['timestamp'] = $timestampData;	2✔
154	}
155	} catch (\Throwable $e) {	×
156	}
157
158	if (!isset($result['signingTime']) \|\| !$result['signingTime'] instanceof \DateTime) {	2✔
159	$result['signingTime'] = $tsa->getSigninTime($decoded);	2✔
160	}
161	return $result;	2✔
162	}
163
164	private function extractCertificateChain(string $signature): array {
165	$pkcs7PemSignature = $this->der2pem($signature);	2✔
166	$pemCertificates = [];	2✔
167
168	if (!openssl_pkcs7_read($pkcs7PemSignature, $pemCertificates)) {	2✔
169	return [];	×
170	}
171
172	$chain = [];	2✔
173	$isLibreSignRootCA = false;	2✔
174	$certificateEngine = $this->getCertificateEngine();	2✔
175
176	foreach ($pemCertificates as $index => $pemCertificate) {	2✔
177	$parsed = $certificateEngine->parseCertificate($pemCertificate);	2✔
178	if ($parsed) {	2✔
179	$parsed['signature_validation'] = [	2✔
180	'id' => 1,	2✔
181	'label' => $this->l10n->t('Signature is valid.'),	2✔
182	];	2✔
183	if (!$isLibreSignRootCA) {	2✔
184	$isLibreSignRootCA = $this->isLibreSignRootCA($pemCertificate, $parsed);	2✔
185	}
186	$parsed['isLibreSignRootCA'] = $isLibreSignRootCA;	2✔
187	$chain[$index] = $parsed;	2✔
188	}
189	}
190	if ($isLibreSignRootCA \|\| $this->isLibreSignFile) {	2✔
191	foreach ($chain as &$cert) {	×
192	$cert['isLibreSignRootCA'] = true;	×
193	}
194	}
195
196	return $chain;	2✔
197	}
198
199	private function isLibreSignRootCA(string $certificate, array $parsed): bool {
200	$rootCertificatePem = $this->getRootCertificatePem();	2✔
201	if (empty($rootCertificatePem)) {	2✔
202	return false;	2✔
203	}
204
205	$rootFingerprint = openssl_x509_fingerprint($rootCertificatePem, 'sha256');	×
206	$fingerprint = openssl_x509_fingerprint($certificate, 'sha256');	×
207	if ($rootFingerprint === $fingerprint) {	×
208	return true;	×
209	}
210
211	return $this->hasLibreSignCaId($parsed);	×
212	}
213
214	private function hasLibreSignCaId(array $parsed): bool {
215	$instanceId = $this->appConfig->getValueString(Application::APP_ID, 'instance_id', '');	×
216	if (strlen($instanceId) !== 10 \|\| !isset($parsed['subject']['OU'])) {	×
217	return false;	×
218	}
219
220	$organizationalUnits = $parsed['subject']['OU'];	×
221	if (is_string($organizationalUnits)) {	×
222	$organizationalUnits = [$organizationalUnits];	×
223	}
224
225	foreach ($organizationalUnits as $ou) {	×
226	$ou = trim($ou);	×
227	if ($this->caIdentifierService->isValidCaId($ou, $instanceId)) {	×
228	return true;	×
229	}
230	}
231
232	return false;	×
233	}
234
235	private function getRootCertificatePem(): string {
236	if (!empty($this->rootCertificatePem)) {	2✔
237	return $this->rootCertificatePem;	×
238	}
239	$configPath = $this->appConfig->getValueString(Application::APP_ID, 'config_path');	2✔
240	if (empty($configPath)	2✔
241	\|\| !is_dir($configPath)	2✔
242	\|\| !is_readable($configPath . DIRECTORY_SEPARATOR . 'ca.pem')	2✔
243	) {
244	return '';	2✔
245	}
246	$rootCertificatePem = file_get_contents($configPath . DIRECTORY_SEPARATOR . 'ca.pem');	×
247	if ($rootCertificatePem === false) {	×
248	return '';	×
249	}
250	$this->rootCertificatePem = $rootCertificatePem;	×
251	return $this->rootCertificatePem;	×
252	}
253
254	private function enrichLeafWithPopplerData($resource, array $result): array {
255	if (empty($result['chain'])) {	2✔
256	return $result;	×
257	}
258
259	$popplerOnlyFields = ['field', 'range', 'certificate_validation'];	2✔
260	if (!isset($result['chain'][0]['subject'])) {	2✔
261	return $result;	×
262	}
263	$needPoppler = false;	2✔
264	foreach ($popplerOnlyFields as $field) {	2✔
265	if (empty($result['chain'][0][$field])) {	2✔
266	$needPoppler = true;	2✔
267	break;	2✔
268	}
269	}
270	if (!isset($result['chain'][0]['signature_validation']) \|\| $result['chain'][0]['signature_validation']['id'] !== 1) {	2✔
271	$needPoppler = true;	×
272	}
273	if (!$needPoppler) {	2✔
274	return $result;	×
275	}
276	$popplerChain = $this->chainFromPoppler($result['chain'][0]['subject'], $resource);	2✔
277	if (empty($popplerChain)) {	2✔
278	return $result;	2✔
279	}
280	foreach ($popplerOnlyFields as $field) {	×
281	if (isset($popplerChain[$field])) {	×
282	$result['chain'][0][$field] = $popplerChain[$field];	×
283	}
284	}
285	if (!isset($result['chain'][0]['signature_validation']) \|\| $result['chain'][0]['signature_validation']['id'] !== 1) {	×
286	if (isset($popplerChain['signature_validation'])) {	×
287	$result['chain'][0]['signature_validation'] = $popplerChain['signature_validation'];	×
288	}
289	}
290	return $result;	×
291	}
292
293	private function chainFromPoppler(array $subject, $resource): array {
294	$fromFallback = $this->popplerUtilsPdfSignFallback($resource);	2✔
295	foreach ($fromFallback as $popplerSig) {	2✔
296	if (!isset($popplerSig['chain'][0]['subject'])) {	2✔
297	continue;	×
298	}
299	if ($popplerSig['chain'][0]['subject'] == $subject) {	2✔
300	return $popplerSig['chain'][0];	×
301	}
302	}
303	return [];	2✔
304	}
305
306	private function popplerUtilsPdfSignFallback($resource): array {
307	if (!empty($this->signaturesFromPoppler)) {	2✔
308	return $this->signaturesFromPoppler;	1✔
309	}
310	if (shell_exec('which pdfsig') === null) {	1✔
311	return $this->signaturesFromPoppler;	×
312	}
313	rewind($resource);	1✔
314	$content = stream_get_contents($resource);	1✔
315	$tempFile = $this->tempManager->getTemporaryFile('file.pdf');	1✔
316	file_put_contents($tempFile, $content);	1✔
317
318	$content = shell_exec('env TZ=UTC pdfsig ' . $tempFile);	1✔
319	if (empty($content)) {	1✔
320	return $this->signaturesFromPoppler;	×
321	}
322	$lines = explode("\n", $content);	1✔
323
324	$lastSignature = 0;	1✔
325	foreach ($lines as $item) {	1✔
326	$isFirstLevel = preg_match('/^Signature\s#(\d)/', $item, $match);	1✔
327	if ($isFirstLevel) {	1✔
328	$lastSignature = (int)$match[1] - 1;	1✔
329	$this->signaturesFromPoppler[$lastSignature] = [];	1✔
330	continue;	1✔
331	}
332
333	$match = [];	1✔
334	$isSecondLevel = preg_match('/^\s+-\s(?<key>.+):\s(?<value>.*)/', $item, $match);	1✔
335	if ($isSecondLevel) {	1✔
336	switch ((string)$match['key']) {	1✔
337	case 'Signing Time':	1✔
338	$this->signaturesFromPoppler[$lastSignature]['signingTime'] = DateTime::createFromFormat('M d Y H:i:s', $match['value'], new \DateTimeZone('UTC'));	1✔
339	break;	1✔
340	case 'Signer full Distinguished Name':	1✔
341	$this->signaturesFromPoppler[$lastSignature]['chain'][0]['subject'] = $this->parseDistinguishedNameWithMultipleValues($match['value']);	1✔
342	$this->signaturesFromPoppler[$lastSignature]['chain'][0]['name'] = $match['value'];	1✔
343	break;	1✔
344	case 'Signing Hash Algorithm':	1✔
345	$this->signaturesFromPoppler[$lastSignature]['chain'][0]['signatureTypeSN'] = $match['value'];	1✔
346	break;	1✔
347	case 'Signature Validation':	1✔
348	$this->signaturesFromPoppler[$lastSignature]['chain'][0]['signature_validation'] = $this->getReadableSigState($match['value']);	1✔
349	break;	1✔
350	case 'Certificate Validation':	1✔
351	$this->signaturesFromPoppler[$lastSignature]['chain'][0]['certificate_validation'] = $this->getReadableCertState($match['value']);	1✔
352	break;	1✔
353	case 'Signed Ranges':	1✔
354	if (preg_match('/\[(\d+) - (\d+)\], \[(\d+) - (\d+)\]/', $match['value'], $ranges)) {	1✔
355	$this->signaturesFromPoppler[$lastSignature]['chain'][0]['range'] = [	1✔
356	'offset1' => (int)$ranges[1],	1✔
357	'length1' => (int)$ranges[2],	1✔
358	'offset2' => (int)$ranges[3],	1✔
359	'length2' => (int)$ranges[4],	1✔
360	];	1✔
361	}
362	break;	1✔
363	case 'Signature Field Name':	1✔
364	$this->signaturesFromPoppler[$lastSignature]['chain'][0]['field'] = $match['value'];	1✔
365	break;	1✔
366	case 'Signature Validation':	1✔
367	case 'Signature Type':	1✔
368	case 'Total document signed':	1✔
369	case 'Not total document signed':	1✔
370	default:
371	break;	1✔
372	}
373	}
374	}
375	return $this->signaturesFromPoppler;	1✔
376	}
377
378	private function getReadableSigState(string $status) {
379	return match ($status) {	2✔
380	'Signature is Valid.' => [	1✔
381	'id' => 1,	1✔
382	'label' => $this->l10n->t('Signature is valid.'),	1✔
383	],	1✔
384	'Signature is Invalid.' => [	×
385	'id' => 2,	×
386	'label' => $this->l10n->t('Signature is invalid.'),	×
387	],	×
388	'Digest Mismatch.' => [	1✔
389	'id' => 3,	1✔
390	'label' => $this->l10n->t('Digest mismatch.'),	1✔
391	],	1✔
392	"Document isn't signed or corrupted data." => [	×
393	'id' => 4,	×
394	'label' => $this->l10n->t("Document isn't signed or corrupted data."),	×
395	],	×
396	'Signature has not yet been verified.' => [	×
397	'id' => 5,	×
398	'label' => $this->l10n->t('Signature has not yet been verified.'),	×
399	],	×
400	default => [	2✔
401	'id' => 6,	2✔
402	'label' => $this->l10n->t('Unknown validation failure.'),	2✔
403	],	2✔
404	};	2✔
405	}
406
407
408	private function getReadableCertState(string $status) {
409	return match ($status) {	1✔
410	'Certificate is Trusted.' => [	×
411	'id' => 1,	×
412	'label' => $this->l10n->t('Certificate is trusted.'),	×
413	],	×
414	"Certificate issuer isn't Trusted." => [	×
415	'id' => 2,	×
416	'label' => $this->l10n->t("Certificate issuer isn't trusted."),	×
417	],	×
418	'Certificate issuer is unknown.' => [	1✔
419	'id' => 3,	1✔
420	'label' => $this->l10n->t('Certificate issuer is unknown.'),	1✔
421	],	1✔
422	'Certificate has been Revoked.' => [	×
423	'id' => 4,	×
424	'label' => $this->l10n->t('Certificate has been revoked.'),	×
425	],	×
426	'Certificate has Expired' => [	×
427	'id' => 5,	×
428	'label' => $this->l10n->t('Certificate has expired'),	×
429	],	×
430	'Certificate has not yet been verified.' => [	×
431	'id' => 6,	×
432	'label' => $this->l10n->t('Certificate has not yet been verified.'),	×
433	],	×
434	default => [	1✔
435	'id' => 7,	1✔
436	'label' => $this->l10n->t('Unknown issue with Certificate or corrupted data.')	1✔
437	],	1✔
438	};	1✔
439	}
440
441
442	private function parseDistinguishedNameWithMultipleValues(string $dn): array {
443	$result = [];	1✔
444	$pairs = preg_split('/,(?=(?:[^"]"[^"]")[^"]$)/', $dn);	1✔
445
446	foreach ($pairs as $pair) {	1✔
447	[$key, $value] = explode('=', $pair, 2);	1✔
448	if (empty($key) \|\| empty($value)) {	1✔
449	return $result;	×
450	}
451	$key = trim($key);	1✔
452	$value = trim($value);	1✔
453	$value = trim($value, '"');	1✔
454
455	if (!isset($result[$key])) {	1✔
456	$result[$key] = $value;	1✔
457	} else {
458	if (!is_array($result[$key])) {	×
459	$result[$key] = [$result[$key]];	×
460	}
461	$result[$key][] = $value;	×
462	}
463	}
464
465	return $result;	1✔
466	}
467
468	private function der2pem($derData) {
469	$pem = chunk_split(base64_encode((string)$derData), 64, "\n");	2✔
470	$pem = "-----BEGIN CERTIFICATE-----\n" . $pem . "-----END CERTIFICATE-----\n";	2✔
471	return $pem;	2✔
472	}
473
474	private function getHandler(): SignEngineHandler {
475	$sign_engine = $this->appConfig->getValueString(Application::APP_ID, 'sign_engine', 'JSignPdf');	1✔
476	$property = lcfirst($sign_engine) . 'Handler';	1✔
477	if (!property_exists($this, $property)) {	1✔
478	throw new LibresignException($this->l10n->t('Invalid Sign engine.'), 400);	×
479	}
480	$classHandler = 'OCA\\Libresign\\Handler\\SignEngine\\' . ucfirst($property);	1✔
481	if (!$this->$property instanceof $classHandler) {	1✔
482	$this->$property = \OCP\Server::get($classHandler);	1✔
483	}
484	return $this->$property;	1✔
485	}
486
487	#[\Override]
488	public function sign(): File {
489	$this->beforeSign();	1✔
490
491	$signedContent = $this->getHandler()	1✔
492	->setCertificate($this->getCertificate())	1✔
493	->setInputFile($this->getInputFile())	1✔
494	->setPassword($this->getPassword())	1✔
495	->setSignatureParams($this->getSignatureParams())	1✔
496	->setVisibleElements($this->getVisibleElements())	1✔
497	->getSignedContent();	1✔
498	$this->getInputFile()->putContent($signedContent);	×
499	return $this->getInputFile();	×
500	}
501
502	public function isHandlerOk(): bool {
503	return $this->certificateEngineFactory->getEngine()->isSetupOk();	1✔
504	}
505	}

LibreSign / libresign / 19860846804

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