Messagelib

cryptohelper.cpp
1/*
2 SPDX-FileCopyrightText: 2015 Sandro KnauƟ <knauss@kolabsys.com>
3 SPDX-FileCopyrightText: 2001,2002 the KPGP authors
4 See file AUTHORS.kpgp for details
5
6 SPDX-License-Identifier: GPL-2.0-or-later
7 */
8
9#include "cryptohelper.h"
10
11using namespace MimeTreeParser;
12
13PGPBlockType Block::determineType() const
14{
15 const QByteArray data = text();
16 if (data.startsWith("-----BEGIN PGP PUBLIC KEY BLOCK-----")) {
17 return NoPgpBlock;
18 } else if (data.startsWith("-----BEGIN PGP SIGNED")) {
19 return ClearsignedBlock;
20 } else if (data.startsWith("-----BEGIN PGP SIGNATURE")) {
21 return SignatureBlock;
22 } else if (data.startsWith("-----BEGIN PGP PUBLIC")) {
23 return PublicKeyBlock;
24 } else if (data.startsWith("-----BEGIN PGP PRIVATE") || data.startsWith("-----BEGIN PGP SECRET")) {
25 return PrivateKeyBlock;
26 } else if (data.startsWith("-----BEGIN PGP MESSAGE")) {
27 if (data.startsWith("-----BEGIN PGP MESSAGE PART")) {
28 return MultiPgpMessageBlock;
29 } else {
30 return PgpMessageBlock;
31 }
32 } else if (data.startsWith("-----BEGIN PGP ARMORED FILE")) {
33 return PgpMessageBlock;
34 } else if (data.startsWith("-----BEGIN PGP ")) {
35 return UnknownBlock;
36 } else {
37 return NoPgpBlock;
38 }
39}
40
41QList<Block> MimeTreeParser::prepareMessageForDecryption(const QByteArray &msg)
42{
43 PGPBlockType pgpBlock = NoPgpBlock;
44 QList<Block> blocks;
45 int start = -1; // start of the current PGP block
46 int lastEnd = -1; // end of the last PGP block
47 const int length = msg.length();
48
49 if (msg.isEmpty()) {
50 return blocks;
51 }
52 if (msg.startsWith("-----BEGIN PGP PUBLIC KEY BLOCK-----")) {
53 return blocks;
54 }
55
56 if (msg.startsWith("-----BEGIN PGP ")) {
57 start = 0;
58 } else {
59 start = msg.indexOf("\n-----BEGIN PGP ") + 1;
60 if (start == 0) {
61 blocks.append(Block(msg, NoPgpBlock));
62 return blocks;
63 }
64 }
65
66 while (start != -1) {
67 int nextEnd;
68 int nextStart;
69
70 // is the PGP block a clearsigned block?
71 if (!strncmp(msg.constData() + start + 15, "SIGNED", 6)) {
72 pgpBlock = ClearsignedBlock;
73 } else {
74 pgpBlock = UnknownBlock;
75 }
76
77 nextEnd = msg.indexOf("\n-----END PGP ", start + 15);
78 nextStart = msg.indexOf("\n-----BEGIN PGP ", start + 15);
79
80 if (nextEnd == -1) { // Missing END PGP line
81 if (lastEnd != -1) {
82 blocks.append(Block(msg.mid(lastEnd + 1), UnknownBlock));
83 } else {
84 blocks.append(Block(msg.mid(start), UnknownBlock));
85 }
86 break;
87 }
88
89 if ((nextStart == -1) || (nextEnd < nextStart) || (pgpBlock == ClearsignedBlock)) {
90 // most likely we found a PGP block (but we don't check if it's valid)
91
92 // store the preceding non-PGP block
93 if (start - lastEnd - 1 > 0) {
94 blocks.append(Block(msg.mid(lastEnd + 1, start - lastEnd - 1), NoPgpBlock));
95 }
96
97 lastEnd = msg.indexOf("\n", nextEnd + 14);
98 if (lastEnd == -1) {
99 if (start < length) {
100 blocks.append(Block(msg.mid(start)));
101 }
102 break;
103 } else {
104 blocks.append(Block(msg.mid(start, lastEnd + 1 - start)));
105 if ((nextStart != -1) && (nextEnd > nextStart)) {
106 nextStart = msg.indexOf("\n-----BEGIN PGP ", lastEnd + 1);
107 }
108 }
109 }
110
111 start = nextStart;
112
113 if (start == -1) {
114 if (lastEnd + 1 < length) {
115 // rest of mail is no PGP Block
116 blocks.append(Block(msg.mid(lastEnd + 1), NoPgpBlock));
117 }
118 break;
119 } else {
120 start++; // move start behind the '\n'
121 }
122 }
123
124 return blocks;
125}
126
127Block::Block() = default;
128
129Block::Block(const QByteArray &m)
130 : msg(m)
131{
132 mType = determineType();
133}
134
135Block::Block(const QByteArray &m, PGPBlockType t)
136 : msg(m)
137 , mType(t)
138{
139}
140
141QByteArray MimeTreeParser::Block::text() const
142{
143 return msg;
144}
145
146PGPBlockType Block::type() const
147{
148 return mType;
149}
Q_SCRIPTABLE Q_NOREPLY void start()
const char * constData() const const
qsizetype indexOf(QByteArrayView bv, qsizetype from) const const
bool isEmpty() const const
qsizetype length() const const
QByteArray mid(qsizetype pos, qsizetype len) const const
bool startsWith(QByteArrayView bv) const const
void append(QList< T > &&value)
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