summaryrefslogtreecommitdiff
path: root/xmlsecurity/source/helper/xmlsignaturehelper.cxx
blob: bcb79039e3424adeb66c2292a428c7ddf3227f52 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */


#include <xmlsignaturehelper.hxx>
#include <documentsignaturehelper.hxx>
#include <xsecctl.hxx>
#include <biginteger.hxx>

#include <xmlsignaturehelper2.hxx>

#include <tools/datetime.hxx>

#include <xmloff/attrlist.hxx>

#include <com/sun/star/io/XOutputStream.hpp>
#include <com/sun/star/io/XInputStream.hpp>
#include <com/sun/star/io/XTruncate.hpp>
#include <com/sun/star/beans/XPropertySet.hpp>
#include <com/sun/star/beans/StringPair.hpp>
#include <com/sun/star/xml/sax/Parser.hpp>
#include <com/sun/star/xml/sax/Writer.hpp>
#include <com/sun/star/embed/ElementModes.hpp>
#include <com/sun/star/embed/XStorage.hpp>
#include <com/sun/star/embed/StorageFormats.hpp>
#include <com/sun/star/embed/XTransactedObject.hpp>

#include <comphelper/ofopxmlhelper.hxx>
#include <comphelper/sequence.hxx>
#include <tools/diagnose_ex.h>
#include <sal/log.hxx>

#include <optional>

#define NS_DOCUMENTSIGNATURES   "http://openoffice.org/2004/documentsignatures"
#define NS_DOCUMENTSIGNATURES_ODF_1_2 "urn:oasis:names:tc:opendocument:xmlns:digitalsignature:1.0"
#define OOXML_SIGNATURE_ORIGIN "http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/origin"
#define OOXML_SIGNATURE_SIGNATURE "http://schemas.openxmlformats.org/package/2006/relationships/digital-signature/signature"

using namespace ::com::sun::star;
using namespace ::com::sun::star::graphic;
using namespace ::com::sun::star::uno;

XMLSignatureHelper::XMLSignatureHelper( const uno::Reference< uno::XComponentContext >& rxCtx)
    : mxCtx(rxCtx), mbODFPre1_2(false)
{
    mpXSecController = new XSecController(rxCtx);
    mbError = false;
}

XMLSignatureHelper::~XMLSignatureHelper()
{
}

void XMLSignatureHelper::SetStorage(
    const Reference < css::embed::XStorage >& rxStorage,
    const OUString& sODFVersion)
{
    SAL_WARN_IF( mxUriBinding.is(), "xmlsecurity.helper", "SetStorage - UriBinding already set!" );
    mxUriBinding = new UriBindingHelper( rxStorage );
    SAL_WARN_IF(!rxStorage.is(), "xmlsecurity.helper", "SetStorage - empty storage!");
    mbODFPre1_2 = DocumentSignatureHelper::isODFPre_1_2(sODFVersion);
}


void XMLSignatureHelper::SetStartVerifySignatureHdl( const Link<LinkParamNone*,bool>& rLink )
{
    maStartVerifySignatureHdl = rLink;
}


void XMLSignatureHelper::StartMission(const uno::Reference<xml::crypto::XXMLSecurityContext>& xSecurityContext)
{
    if ( !mxUriBinding.is() )
        mxUriBinding = new UriBindingHelper();

    mpXSecController->startMission(mxUriBinding, xSecurityContext);
}

void XMLSignatureHelper::EndMission()
{
    mpXSecController->endMission();
}

sal_Int32 XMLSignatureHelper::GetNewSecurityId()
{
    return mpXSecController->getNewSecurityId();
}

void XMLSignatureHelper::SetX509Certificate(
        sal_Int32 nSecurityId,
        const OUString& ouX509IssuerName,
        const OUString& ouX509SerialNumber,
        const OUString& ouX509Cert,
        const OUString& ouX509CertDigest,
        svl::crypto::SignatureMethodAlgorithm eAlgorithmID)
{
    mpXSecController->setX509Certificate(
        nSecurityId,
        ouX509IssuerName,
        ouX509SerialNumber,
        ouX509Cert,
        ouX509CertDigest,
        eAlgorithmID);
}

void XMLSignatureHelper::AddEncapsulatedX509Certificate(const OUString& ouEncapsulatedX509Certificate)
{
    mpXSecController->addEncapsulatedX509Certificate(ouEncapsulatedX509Certificate);
}

void XMLSignatureHelper::SetGpgCertificate(sal_Int32 nSecurityId,
                                           const OUString& ouGpgCertDigest,
                                           const OUString& ouGpgCert,
                                           const OUString& ouGpgOwner)
{
    mpXSecController->setGpgCertificate(
        nSecurityId,
        ouGpgCertDigest,
        ouGpgCert,
        ouGpgOwner);
}

void XMLSignatureHelper::SetDateTime( sal_Int32 nSecurityId, const ::DateTime& rDateTime )
{
    css::util::DateTime stDateTime = rDateTime.GetUNODateTime();
    mpXSecController->setDate( nSecurityId, stDateTime );
}

void XMLSignatureHelper::SetDescription(sal_Int32 nSecurityId, const OUString& rDescription)
{
    mpXSecController->setDescription(nSecurityId, rDescription);
}

void XMLSignatureHelper::SetSignatureLineId(sal_Int32 nSecurityId, const OUString& rSignatureLineId)
{
    mpXSecController->setSignatureLineId(nSecurityId, rSignatureLineId);
}

void XMLSignatureHelper::SetSignatureLineValidGraphic(
    sal_Int32 nSecurityId, const css::uno::Reference<XGraphic>& xValidGraphic)
{
    mpXSecController->setSignatureLineValidGraphic(nSecurityId, xValidGraphic);
}

void XMLSignatureHelper::SetSignatureLineInvalidGraphic(
    sal_Int32 nSecurityId, const css::uno::Reference<XGraphic>& xInvalidGraphic)
{
    mpXSecController->setSignatureLineInvalidGraphic(nSecurityId, xInvalidGraphic);
}

void XMLSignatureHelper::AddForSigning( sal_Int32 nSecurityId, const OUString& uri, bool bBinary, bool bXAdESCompliantIfODF )
{
    mpXSecController->signAStream( nSecurityId, uri, bBinary, bXAdESCompliantIfODF );
}


uno::Reference<xml::sax::XWriter> XMLSignatureHelper::CreateDocumentHandlerWithHeader(
    const css::uno::Reference< css::io::XOutputStream >& xOutputStream )
{
    /*
     * get SAX writer component
     */
    uno::Reference< xml::sax::XWriter > xSaxWriter = xml::sax::Writer::create(mxCtx);

    /*
     * connect XML writer to output stream
     */
    xSaxWriter->setOutputStream( xOutputStream );

    /*
     * write the xml context for signatures
     */
    SvXMLAttributeList *pAttributeList = new SvXMLAttributeList();
    OUString sNamespace;
    if (mbODFPre1_2)
        sNamespace = NS_DOCUMENTSIGNATURES;
    else
        sNamespace = NS_DOCUMENTSIGNATURES_ODF_1_2;

    pAttributeList->AddAttribute(
        "xmlns",
        sNamespace);

    xSaxWriter->startDocument();
    xSaxWriter->startElement(
        "document-signatures",
        uno::Reference< css::xml::sax::XAttributeList > (pAttributeList));

    return xSaxWriter;
}

void XMLSignatureHelper::CloseDocumentHandler( const uno::Reference<xml::sax::XDocumentHandler>& xDocumentHandler )
{
    xDocumentHandler->endElement( "document-signatures" );
    xDocumentHandler->endDocument();
}

void XMLSignatureHelper::ExportSignature(
    const uno::Reference< xml::sax::XDocumentHandler >& xDocumentHandler,
    const SignatureInformation& signatureInfo,
    bool bXAdESCompliantIfODF )
{
    XSecController::exportSignature(xDocumentHandler, signatureInfo, bXAdESCompliantIfODF);
}

void XMLSignatureHelper::ExportOOXMLSignature(const uno::Reference<embed::XStorage>& xRootStorage, const uno::Reference<embed::XStorage>& xSignatureStorage, const SignatureInformation& rInformation, int nSignatureIndex)
{
    uno::Reference<io::XOutputStream> xOutputStream(xSignatureStorage->openStreamElement("sig" + OUString::number(nSignatureIndex) + ".xml", embed::ElementModes::READWRITE), uno::UNO_QUERY);

    if (rInformation.aSignatureBytes.hasElements())
        // This is a signature roundtrip, just write back the signature as-is.
        xOutputStream->writeBytes(rInformation.aSignatureBytes);
    else
    {
        uno::Reference<xml::sax::XWriter> xSaxWriter = xml::sax::Writer::create(mxCtx);
        xSaxWriter->setOutputStream(xOutputStream);
        xSaxWriter->startDocument();

        mpXSecController->exportOOXMLSignature(xRootStorage, xSaxWriter, rInformation);

        xSaxWriter->endDocument();
    }
}

void XMLSignatureHelper::CreateAndWriteSignature( const uno::Reference< xml::sax::XDocumentHandler >& xDocumentHandler, bool bXAdESCompliantIfODF )
{
    mbError = false;

    if ( !mpXSecController->WriteSignature( xDocumentHandler, bXAdESCompliantIfODF ) )
    {
        mbError = true;
    }
}

bool XMLSignatureHelper::ReadAndVerifySignature( const css::uno::Reference< css::io::XInputStream >& xInputStream )
{
    mbError = false;

    SAL_WARN_IF(!xInputStream.is(), "xmlsecurity.helper", "input stream missing");

    // prepare ParserInputSrouce
    xml::sax::InputSource aParserInput;
    aParserInput.aInputStream = xInputStream;

    // get SAX parser component
    uno::Reference< xml::sax::XParser > xParser = xml::sax::Parser::create(mxCtx);

    // create a signature reader
    uno::Reference< xml::sax::XDocumentHandler > xHandler
        = mpXSecController->createSignatureReader(*this);

    // setup the connection:
    // Parser -> SignatureReader
    xParser->setDocumentHandler( xHandler );

    // parser the stream
    try
    {
        xParser->parseStream( aParserInput );
    }
    catch( uno::Exception& )
    {
        mbError = true;
    }

    // release the signature reader
    mpXSecController->releaseSignatureReader( );

    return !mbError;
}

SignatureInformation XMLSignatureHelper::GetSignatureInformation( sal_Int32 nSecurityId ) const
{
    return mpXSecController->getSignatureInformation( nSecurityId );
}

SignatureInformations XMLSignatureHelper::GetSignatureInformations() const
{
    return mpXSecController->getSignatureInformations();
}

void XMLSignatureHelper::StartVerifySignatureElement()
{
    if ( !maStartVerifySignatureHdl.IsSet() || maStartVerifySignatureHdl.Call(nullptr) )
    {
        sal_Int32 nSignatureId = mpXSecController->getNewSecurityId();
        mpXSecController->addSignature( nSignatureId );
    }
}

namespace
{
bool lcl_isSignatureType(const beans::StringPair& rPair)
{
    return rPair.First == "Type" && rPair.Second == OOXML_SIGNATURE_SIGNATURE;
}
bool lcl_isSignatureOriginType(const beans::StringPair& rPair)
{
    return rPair.First == "Type" && rPair.Second == OOXML_SIGNATURE_ORIGIN;
}
}

bool XMLSignatureHelper::ReadAndVerifySignatureStorage(const uno::Reference<embed::XStorage>& xStorage, bool bCacheLastSignature)
{
    sal_Int32 nOpenMode = embed::ElementModes::READ;
    if (xStorage.is() && !xStorage->hasByName("_rels"))
    {
        SAL_WARN("xmlsecurity.helper", "expected stream, in signature storage but not found: _rels");
        return false;
    }

    uno::Reference<embed::XStorage> xSubStorage = xStorage->openStorageElement("_rels", nOpenMode);
    uno::Reference<io::XInputStream> xRelStream(xSubStorage->openStreamElement("origin.sigs.rels", nOpenMode), uno::UNO_QUERY);
    uno::Sequence< uno::Sequence<beans::StringPair> > aRelationsInfo = comphelper::OFOPXMLHelper::ReadRelationsInfoSequence(xRelStream, "origin.sigs.rels", mxCtx);

    for (sal_Int32 i = 0; i < aRelationsInfo.getLength(); ++i)
    {
        const uno::Sequence<beans::StringPair>& rRelation = aRelationsInfo[i];
        auto aRelation = comphelper::sequenceToContainer< std::vector<beans::StringPair> >(rRelation);
        if (std::any_of(aRelation.begin(), aRelation.end(), lcl_isSignatureType))
        {
            std::vector<beans::StringPair>::iterator it = std::find_if(aRelation.begin(), aRelation.end(), [](const beans::StringPair& rPair) { return rPair.First == "Target"; });
            if (it != aRelation.end())
            {
                if (xStorage.is() && !xStorage->hasByName(it->Second))
                {
                    SAL_WARN("xmlsecurity.helper", "expected stream, but not found: " << it->Second);
                    continue;
                }

                uno::Reference<io::XInputStream> xInputStream(xStorage->openStreamElement(it->Second, nOpenMode), uno::UNO_QUERY);
                if (!ReadAndVerifySignatureStorageStream(xInputStream))
                    return false;

                // By default, we cache. If it's requested, then we don't cache the last signature.
                bool bCache = true;
                if (!bCacheLastSignature && i == aRelationsInfo.getLength() - 1)
                    bCache = false;

                if (!bCache)
                    continue;
                // Store the contents of the stream as is, in case we need to write it back later.
                xInputStream.clear();
                xInputStream.set(xStorage->openStreamElement(it->Second, nOpenMode), uno::UNO_QUERY);
                uno::Reference<beans::XPropertySet> xPropertySet(xInputStream, uno::UNO_QUERY);
                if (!xPropertySet.is())
                    continue;

                sal_Int64 nSize = 0;
                xPropertySet->getPropertyValue("Size") >>= nSize;
                if (nSize < 0 || nSize > SAL_MAX_INT32)
                {
                    SAL_WARN("xmlsecurity.helper", "bogus signature size: " << nSize);
                    continue;
                }
                uno::Sequence<sal_Int8> aData;
                xInputStream->readBytes(aData, nSize);
                mpXSecController->setSignatureBytes(aData);
            }
        }
    }

    return true;
}

bool XMLSignatureHelper::ReadAndVerifySignatureStorageStream(const css::uno::Reference<css::io::XInputStream>& xInputStream)
{
    mbError = false;

    // Create the input source.
    xml::sax::InputSource aParserInput;
    aParserInput.aInputStream = xInputStream;

    // Create the sax parser.
    uno::Reference<xml::sax::XParser> xParser = xml::sax::Parser::create(mxCtx);

    // Create the signature reader.
    uno::Reference<xml::sax::XDocumentHandler> xHandler = mpXSecController->createSignatureReader(*this, embed::StorageFormats::OFOPXML);

    // Parser -> signature reader.
    xParser->setDocumentHandler(xHandler);

    // Parse the stream.
    try
    {
        xParser->parseStream(aParserInput);
    }
    catch(const uno::Exception&)
    {
        DBG_UNHANDLED_EXCEPTION("xmlsecurity.helper");
        mbError = true;
    }

    mpXSecController->releaseSignatureReader();

    return !mbError;
}

void XMLSignatureHelper::EnsureSignaturesRelation(const css::uno::Reference<css::embed::XStorage>& xStorage, bool bAdd)
{
    sal_Int32 nOpenMode = embed::ElementModes::READWRITE;
    uno::Reference<embed::XStorage> xSubStorage = xStorage->openStorageElement("_rels", nOpenMode);
    uno::Reference<io::XInputStream> xRelStream(xSubStorage->openStreamElement(".rels", nOpenMode), uno::UNO_QUERY);
    std::vector< uno::Sequence<beans::StringPair> > aRelationsInfo = comphelper::sequenceToContainer< std::vector< uno::Sequence<beans::StringPair> > >(comphelper::OFOPXMLHelper::ReadRelationsInfoSequence(xRelStream, ".rels", mxCtx));

    // Do we have a relation already?
    bool bHaveRelation = false;
    int nCount = 0;
    for (const uno::Sequence<beans::StringPair>& rRelation : aRelationsInfo)
    {
        auto aRelation = comphelper::sequenceToContainer< std::vector<beans::StringPair> >(rRelation);
        if (std::any_of(aRelation.begin(), aRelation.end(), lcl_isSignatureOriginType))
        {
            bHaveRelation = true;
            break;
        }
        ++nCount;
    }

    if (!bHaveRelation && bAdd)
    {
        // No, and have to add one.
        std::vector<beans::StringPair> aRelation;
        aRelation.emplace_back("Id", "rId" + OUString::number(++nCount));
        aRelation.emplace_back("Type", OOXML_SIGNATURE_ORIGIN);
        aRelation.emplace_back("Target", "_xmlsignatures/origin.sigs");
        aRelationsInfo.push_back(comphelper::containerToSequence(aRelation));
    }
    else if (bHaveRelation && !bAdd)
    {
        // Yes, and need to remove it.
        for (std::vector< uno::Sequence<beans::StringPair> >::iterator it = aRelationsInfo.begin(); it != aRelationsInfo.end();)
        {
            auto aRelation = comphelper::sequenceToContainer< std::vector<beans::StringPair> >(*it);
            if (std::any_of(aRelation.begin(), aRelation.end(), lcl_isSignatureOriginType))
                it = aRelationsInfo.erase(it);
            else
                ++it;
        }
    }

    // Write it back.
    uno::Reference<io::XTruncate> xTruncate(xRelStream, uno::UNO_QUERY);
    xTruncate->truncate();
    uno::Reference<io::XOutputStream> xOutputStream(xRelStream, uno::UNO_QUERY);
    comphelper::OFOPXMLHelper::WriteRelationsInfoSequence(xOutputStream, comphelper::containerToSequence(aRelationsInfo), mxCtx);

    // Commit it.
    uno::Reference<embed::XTransactedObject> xTransact(xSubStorage, uno::UNO_QUERY);
    xTransact->commit();
    xTransact.set(xStorage, uno::UNO_QUERY);
    xTransact->commit();
}

void XMLSignatureHelper::ExportSignatureRelations(const css::uno::Reference<css::embed::XStorage>& xStorage, int nSignatureCount)
{
    // Write the empty file, its relations will be the signatures.
    sal_Int32 nOpenMode = embed::ElementModes::READWRITE;
    uno::Reference<io::XOutputStream> xOriginStream(xStorage->openStreamElement("origin.sigs", nOpenMode), uno::UNO_QUERY);
    uno::Reference<io::XTruncate> xTruncate(xOriginStream, uno::UNO_QUERY);
    xTruncate->truncate();
    xOriginStream->closeOutput();

    // Write the relations.
    uno::Reference<embed::XStorage> xSubStorage = xStorage->openStorageElement("_rels", nOpenMode);
    uno::Reference<io::XOutputStream> xRelStream(xSubStorage->openStreamElement("origin.sigs.rels", nOpenMode), uno::UNO_QUERY);
    std::vector< uno::Sequence<beans::StringPair> > aRelations;
    for (int i = 0; i < nSignatureCount; ++i)
    {
        std::vector<beans::StringPair> aRelation;
        aRelation.emplace_back("Id", "rId" + OUString::number(i + 1));
        aRelation.emplace_back("Type", OOXML_SIGNATURE_SIGNATURE);
        aRelation.emplace_back("Target", "sig" + OUString::number(i + 1) + ".xml");
        aRelations.push_back(comphelper::containerToSequence(aRelation));
    }
    comphelper::OFOPXMLHelper::WriteRelationsInfoSequence(xRelStream, comphelper::containerToSequence(aRelations), mxCtx);
    uno::Reference<embed::XTransactedObject> xTransact(xSubStorage, uno::UNO_QUERY);
    xTransact->commit();
}

void XMLSignatureHelper::ExportSignatureContentTypes(const css::uno::Reference<css::embed::XStorage>& xStorage, int nSignatureCount)
{
    uno::Reference<io::XStream> xStream = xStorage->openStreamElement("[Content_Types].xml", embed::ElementModes::READWRITE);
    uno::Reference<io::XInputStream> xInputStream = xStream->getInputStream();
    uno::Sequence< uno::Sequence<beans::StringPair> > aContentTypeInfo = comphelper::OFOPXMLHelper::ReadContentTypeSequence(xInputStream, mxCtx);
    if (aContentTypeInfo.getLength() < 2)
    {
        SAL_WARN("xmlsecurity.helper", "no defaults or overrides in aContentTypeInfo");
        return;
    }

    // Append rels and sigs to defaults, if it's not there already.
    uno::Sequence<beans::StringPair>& rDefaults = aContentTypeInfo[0];
    auto aDefaults = comphelper::sequenceToContainer< std::vector<beans::StringPair> >(rDefaults);
    if (std::none_of(rDefaults.begin(), rDefaults.end(), [](const beans::StringPair& rPair) { return rPair.First == "rels"; }))
        aDefaults.emplace_back("rels", "application/vnd.openxmlformats-package.relationships+xml");

    if (std::none_of(rDefaults.begin(), rDefaults.end(), [](const beans::StringPair& rPair) { return rPair.First == "sigs"; }))
        aDefaults.emplace_back("sigs", "application/vnd.openxmlformats-package.digital-signature-origin");
    rDefaults = comphelper::containerToSequence(aDefaults);

    // Remove existing signature overrides.
    uno::Sequence<beans::StringPair>& rOverrides = aContentTypeInfo[1];
    auto aOverrides = comphelper::sequenceToContainer< std::vector<beans::StringPair> >(rOverrides);
    aOverrides.erase(std::remove_if(aOverrides.begin(), aOverrides.end(), [](const beans::StringPair& rPair)
    {
        return rPair.First.startsWith("/_xmlsignatures/sig");
    }), aOverrides.end());

    // Add our signature overrides.
    for (int i = 1; i <= nSignatureCount; ++i)
        aOverrides.emplace_back("/_xmlsignatures/sig" + OUString::number(i) + ".xml", "application/vnd.openxmlformats-package.digital-signature-xmlsignature+xml");

    rOverrides = comphelper::containerToSequence(aOverrides);
    uno::Reference<io::XOutputStream> xOutputStream = xStream->getOutputStream();
    uno::Reference <io::XTruncate> xTruncate(xOutputStream, uno::UNO_QUERY);
    xTruncate->truncate();
    comphelper::OFOPXMLHelper::WriteContentSequence(xOutputStream, rDefaults, rOverrides, mxCtx);
    uno::Reference<embed::XTransactedObject> xTransact(xStorage, uno::UNO_QUERY);
    xTransact->commit();
}
void XMLSignatureHelper::CreateAndWriteOOXMLSignature(const uno::Reference<embed::XStorage>& xRootStorage, const uno::Reference<embed::XStorage>& xSignatureStorage, int nSignatureIndex)
{
    uno::Reference<io::XOutputStream> xOutputStream(xSignatureStorage->openStreamElement("sig" + OUString::number(nSignatureIndex) + ".xml", embed::ElementModes::READWRITE), uno::UNO_QUERY);
    uno::Reference<xml::sax::XWriter> xSaxWriter = xml::sax::Writer::create(mxCtx);
    xSaxWriter->setOutputStream(xOutputStream);
    xSaxWriter->startDocument();

    mbError = false;
    if (!mpXSecController->WriteOOXMLSignature(xRootStorage, xSaxWriter))
        mbError = true;

    xSaxWriter->endDocument();
}

/** check this constraint from xmldsig-core 4.5.4:

  All certificates appearing in an X509Data element MUST relate to the
  validation key by either containing it or being part of a certification
  chain that terminates in a certificate containing the validation key.
 */
static auto CheckX509Data(
    uno::Reference<xml::crypto::XSecurityEnvironment> const& xSecEnv,
    std::vector<SignatureInformation::X509CertInfo> const& rX509CertInfos,
    std::vector<uno::Reference<security::XCertificate>> & rCerts,
    std::vector<SignatureInformation::X509CertInfo> & rSorted) -> bool
{
    assert(rCerts.empty());
    assert(rSorted.empty());
    if (rX509CertInfos.empty())
    {
        SAL_WARN("xmlsecurity.comp", "no X509Data");
        return false;
    }
    std::vector<uno::Reference<security::XCertificate>> certs;
    for (SignatureInformation::X509CertInfo const& it : rX509CertInfos)
    {
        if (!it.X509Certificate.isEmpty())
        {
            certs.emplace_back(xSecEnv->createCertificateFromAscii(it.X509Certificate));
        }
        else
        {
            certs.emplace_back(xSecEnv->getCertificate(
                it.X509IssuerName,
                xmlsecurity::numericStringToBigInteger(it.X509SerialNumber)));
        }
        if (!certs.back().is())
        {
            SAL_WARN("xmlsecurity.comp", "X509Data cannot be parsed");
            return false;
        }
    }

    // first, search one whose issuer isn't in the list, or a self-signed one
    std::optional<size_t> start;
    for (size_t i = 0; i < certs.size(); ++i)
    {
        for (size_t j = 0; ; ++j)
        {
            if (j == certs.size())
            {
                if (start)
                {
                    SAL_WARN("xmlsecurity.comp", "X509Data do not form a chain: certificate has no issuer but already have start of chain: " << certs[i]->getSubjectName());
                    return false;
                }
                start = i; // issuer isn't in the list
                break;
            }
            if (xmlsecurity::EqualDistinguishedNames(certs[i]->getIssuerName(), certs[j]->getSubjectName()))
            {
                if (i == j) // self signed
                {
                    if (start)
                    {
                        SAL_WARN("xmlsecurity.comp", "X509Data do not form a chain: certificate is self-signed but already have start of chain: " << certs[i]->getSubjectName());
                        return false;
                    }
                    start = i;
                }
                break;
            }
        }
    }
    std::vector<size_t> chain;
    if (!start)
    {
        // this can only be a cycle?
        SAL_WARN("xmlsecurity.comp", "X509Data do not form a chain: cycle detected");
        return false;
    }
    chain.emplace_back(*start);

    // second, check that there is a chain, no tree or cycle...
    for (size_t i = 0; i < certs.size(); ++i)
    {
        assert(chain.size() == i + 1);
        for (size_t j = 0; j < certs.size(); ++j)
        {
            if (chain[i] != j)
            {
                if (xmlsecurity::EqualDistinguishedNames(
                        certs[chain[i]]->getSubjectName(), certs[j]->getIssuerName()))
                {
                    if (chain.size() != i + 1) // already found issuee?
                    {
                        SAL_WARN("xmlsecurity.comp", "X509Data do not form a chain: certificate issued 2 others: " << certs[chain[i]]->getSubjectName());
                        return false;
                    }
                    chain.emplace_back(j);
                }
            }
        }
        if (i == certs.size() - 1)
        {   // last one: must be a leaf
            if (chain.size() != i + 1)
            {
                SAL_WARN("xmlsecurity.comp", "X509Data do not form a chain: certificate in cycle: " << certs[chain[i]]->getSubjectName());
                return false;
            }
        }
        else if (chain.size() != i + 2)
        {   // not issuer of another?
            SAL_WARN("xmlsecurity.comp", "X509Data do not form a chain: certificate issued 0 others: " << certs[chain[i]]->getSubjectName());
            return false;
        }
    }

    // success
    assert(chain.size() == rX509CertInfos.size());
    for (auto const& it : chain)
    {
        rSorted.emplace_back(rX509CertInfos[it]);
        rCerts.emplace_back(certs[it]);
    }
    return true;
}

std::vector<uno::Reference<security::XCertificate>>
XMLSignatureHelper::CheckAndUpdateSignatureInformation(
    uno::Reference<xml::crypto::XSecurityEnvironment> const& xSecEnv,
    SignatureInformation const& rInfo)
{
    // if the check fails, it's not possible to determine which X509Data
    // contained the signing certificate - the UI cannot display something
    // useful in this case, so prevent anything misleading by clearing the
    // X509Datas.

    std::vector<uno::Reference<security::XCertificate>> certs;
    std::vector<SignatureInformation::X509Data> datas;
    // TODO: for now, just merge all X509Datas together for checking...
    // (this will probably break round-trip of signature with multiple X509Data,
    // no idea if that is a problem)
    SignatureInformation::X509Data temp;
    SignatureInformation::X509Data tempResult;
    for (auto const& rData : rInfo.X509Datas)
    {
        for (auto const& it : rData)
        {
            temp.emplace_back(it);
        }
    }
    if (CheckX509Data(xSecEnv, temp, certs, tempResult))
    {
        datas.emplace_back(tempResult);
    }

    // rInfo is a copy, update the original
    mpXSecController->UpdateSignatureInformation(rInfo.nSecurityId, datas);
    return certs;
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */