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
|
/* -*- 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/.
*/
#include <pdfsignaturehelper.hxx>
#include <memory>
#include <com/sun/star/io/XTruncate.hpp>
#include <com/sun/star/io/XStream.hpp>
#include <com/sun/star/security/CertificateValidity.hpp>
#include <com/sun/star/uno/SecurityException.hpp>
#include <com/sun/star/security/DocumentSignatureInformation.hpp>
#include <com/sun/star/xml/crypto/XSecurityEnvironment.hpp>
#include <unotools/ucbstreamhelper.hxx>
#include <vcl/filter/pdfdocument.hxx>
#include <pdfio/pdfdocument.hxx>
#include <tools/diagnose_ex.h>
#include <sal/log.hxx>
using namespace ::com::sun::star;
PDFSignatureHelper::PDFSignatureHelper() = default;
bool PDFSignatureHelper::ReadAndVerifySignature(
const uno::Reference<io::XInputStream>& xInputStream)
{
if (!xInputStream.is())
{
SAL_WARN("xmlsecurity.helper", "input stream missing");
return false;
}
std::unique_ptr<SvStream> pStream(utl::UcbStreamHelper::CreateStream(xInputStream, true));
vcl::filter::PDFDocument aDocument;
if (!aDocument.Read(*pStream))
{
SAL_WARN("xmlsecurity.helper", "failed to read the document");
return false;
}
std::vector<vcl::filter::PDFObjectElement*> aSignatures = aDocument.GetSignatureWidgets();
if (aSignatures.empty())
return true;
m_aSignatureInfos.clear();
int nMDPPerm = aDocument.GetMDPPerm();
for (size_t i = 0; i < aSignatures.size(); ++i)
{
SignatureInformation aInfo(i);
if (!xmlsecurity::pdfio::ValidateSignature(*pStream, aSignatures[i], aInfo, aDocument,
nMDPPerm))
SAL_WARN("xmlsecurity.helper", "failed to determine digest match");
m_aSignatureInfos.push_back(aInfo);
}
return true;
}
SignatureInformations const& PDFSignatureHelper::GetSignatureInformations() const
{
return m_aSignatureInfos;
}
uno::Sequence<security::DocumentSignatureInformation>
PDFSignatureHelper::GetDocumentSignatureInformations(
const uno::Reference<xml::crypto::XSecurityEnvironment>& xSecEnv) const
{
uno::Sequence<security::DocumentSignatureInformation> aRet(m_aSignatureInfos.size());
for (size_t i = 0; i < m_aSignatureInfos.size(); ++i)
{
const SignatureInformation& rInternal = m_aSignatureInfos[i];
security::DocumentSignatureInformation& rExternal = aRet[i];
rExternal.SignatureIsValid
= rInternal.nStatus == xml::crypto::SecurityOperationStatus_OPERATION_SUCCEEDED;
if (rInternal.GetSigningCertificate()
&& !rInternal.GetSigningCertificate()->X509Certificate.isEmpty())
{
rExternal.Signer = xSecEnv->createCertificateFromAscii(
rInternal.GetSigningCertificate()->X509Certificate);
}
rExternal.PartialDocumentSignature = rInternal.bPartialDocumentSignature;
// Verify certificate.
if (rExternal.Signer.is())
{
try
{
rExternal.CertificateStatus = xSecEnv->verifyCertificate(rExternal.Signer, {});
}
catch (const uno::SecurityException&)
{
DBG_UNHANDLED_EXCEPTION("xmlsecurity.helper", "failed to verify certificate");
rExternal.CertificateStatus = security::CertificateValidity::INVALID;
}
}
else
rExternal.CertificateStatus = security::CertificateValidity::INVALID;
}
return aRet;
}
sal_Int32 PDFSignatureHelper::GetNewSecurityId() const { return m_aSignatureInfos.size(); }
void PDFSignatureHelper::SetX509Certificate(
const uno::Reference<security::XCertificate>& xCertificate)
{
m_xCertificate = xCertificate;
}
void PDFSignatureHelper::SetDescription(const OUString& rDescription)
{
m_aDescription = rDescription;
}
bool PDFSignatureHelper::Sign(const uno::Reference<io::XInputStream>& xInputStream, bool bAdES)
{
std::unique_ptr<SvStream> pStream(utl::UcbStreamHelper::CreateStream(xInputStream, true));
vcl::filter::PDFDocument aDocument;
if (!aDocument.Read(*pStream))
{
SAL_WARN("xmlsecurity.helper", "failed to read the document");
return false;
}
if (!aDocument.Sign(m_xCertificate, m_aDescription, bAdES))
{
SAL_WARN("xmlsecurity.helper", "failed to sign");
return false;
}
uno::Reference<io::XStream> xStream(xInputStream, uno::UNO_QUERY);
std::unique_ptr<SvStream> pOutStream(utl::UcbStreamHelper::CreateStream(xStream, true));
if (!aDocument.Write(*pOutStream))
{
SAL_WARN("xmlsecurity.helper", "failed to write signed data");
return false;
}
return true;
}
bool PDFSignatureHelper::RemoveSignature(const uno::Reference<io::XInputStream>& xInputStream,
sal_uInt16 nPosition)
{
std::unique_ptr<SvStream> pStream(utl::UcbStreamHelper::CreateStream(xInputStream, true));
vcl::filter::PDFDocument aDocument;
if (!aDocument.Read(*pStream))
{
SAL_WARN("xmlsecurity.helper", "failed to read the document");
return false;
}
if (!aDocument.RemoveSignature(nPosition))
{
SAL_WARN("xmlsecurity.helper", "failed to remove signature");
return false;
}
uno::Reference<io::XStream> xStream(xInputStream, uno::UNO_QUERY);
uno::Reference<io::XTruncate> xTruncate(xStream, uno::UNO_QUERY);
if (!xTruncate.is())
{
SAL_WARN("xmlsecurity.helper", "failed to truncate");
return false;
}
xTruncate->truncate();
std::unique_ptr<SvStream> pOutStream(utl::UcbStreamHelper::CreateStream(xStream, true));
if (!aDocument.Write(*pOutStream))
{
SAL_WARN("xmlsecurity.helper", "failed to write without signature");
return false;
}
return true;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
