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annotate ui/sslconnection.cpp @ 446:43090637d6ae

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author Raimund Renkert <rrenkert@intevation.de>
date Wed, 23 Apr 2014 11:55:28 +0200
parents 09bb19e5e369
children f8b480b08532
rev   line source
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1 /* Copyright (C) 2014 by Bundesamt für Sicherheit in der Informationstechnik
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU GPL (v>=2)
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5 * and comes with ABSOLUTELY NO WARRANTY!
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6 * See LICENSE.txt for details.
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7 */
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8 /* TODO: Wrap ssl_session in a class for reuse.
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9 * see programs/ssl/ssl_client2.c for example of session reuse */
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10 #include "sslconnection.h"
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11
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12 #include <QFile>
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13 #include <QUuid>
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14 #include <QApplication>
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15
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16 #define MAX_IO_TRIES 10
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17 #define MAX_RESETS 10
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18
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19 #ifdef CONNECTION_DEBUG
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20 static void my_debug(void *ctx, int level, const char *str)
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21 {
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22 fprintf((FILE *) ctx, "%s", str);
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23 fflush((FILE *) ctx);
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24 }
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25 #endif
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26
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27 QString getErrorMsg(int ret)
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28 {
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29 char errbuf[255];
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30 polarssl_strerror(ret, errbuf, 255);
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31 errbuf[254] = '\0'; /* Just to be sure */
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32 return QString::fromLatin1(errbuf);
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33 }
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34
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35 SSLConnection::SSLConnection(const QString& url,
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36 const QByteArray& certificate):
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37 mUrl(url),
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38 mPinnedCert(certificate),
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39 mInitialized(false),
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40 mConnected(false),
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41 mServerFD(-1),
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42 mErrorState(NoError)
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43 {
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44 int ret = -1;
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45
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46 memset(&mSSL, 0, sizeof(ssl_context));
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47 memset(&mSavedSession, 0, sizeof( ssl_session ) );
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48
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49 if (certificate.isEmpty()) {
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50 QFile certResource(":certs/intevation.de");
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51 certResource.open(QFile::ReadOnly);
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52 mPinnedCert = certResource.readAll();
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53 certResource.close();
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54 }
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55
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56 ret = init();
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57 if (ret == 0) {
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58 mInitialized = true;
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59 } else {
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60 qDebug() << "Initialization error: " + getErrorMsg(ret);
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61 }
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62 }
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63
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64 int SSLConnection::init()
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65 {
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66 int ret = -1;
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67 QUuid uuid = QUuid::createUuid();
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68 QString personalString = QApplication::applicationName() + uuid.toString();
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69 QByteArray personalBa = personalString.toLocal8Bit();
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70
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71 x509_crt_init(&mX509PinnedCert);
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72 entropy_init(&mEntropy);
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73
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74 ret = ssl_init(&mSSL);
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75 if (ret != 0) {
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76 /* The only documented error is malloc failed */
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77 mErrorState = ErrUnknown;
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78 return ret;
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79 }
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80
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81 /*
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82 * Initialize random generator.
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83 * Personalisation string, does not need to be random but
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84 * should be unique according to documentation.
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85 *
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86 * the ctr_drbg structure does not need to be freed explicitly.
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87 */
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88 ret = ctr_drbg_init(&mCtr_drbg, entropy_func, &mEntropy,
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89 (const unsigned char*) personalBa.constData(),
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90 personalBa.size());
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91 if (ret != 0) {
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92 ssl_free(&mSSL);
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93 mErrorState = ErrUnknown;
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94 return ret;
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95 }
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96
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97 ret = x509_crt_parse(&mX509PinnedCert,
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98 (const unsigned char*) mPinnedCert.constData(),
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99 mPinnedCert.size());
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100 if (ret != 0){
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101 ssl_free(&mSSL);
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102 mErrorState = InvalidPinnedCertificate;
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103 return ret;
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104 }
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105
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106 ssl_set_endpoint(&mSSL, SSL_IS_CLIENT);
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107 ssl_set_authmode(&mSSL, SSL_VERIFY_OPTIONAL);
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108 ssl_set_ca_chain(&mSSL, &mX509PinnedCert, NULL, NULL);
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109 ssl_set_renegotiation(&mSSL, SSL_RENEGOTIATION_DISABLED);
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110 ssl_set_rng(&mSSL, ctr_drbg_random, &mCtr_drbg);
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111 #ifdef RELEASE_BUILD
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112 ssl_set_min_version(&mSSL, SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_3);
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113 #endif
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114
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115 #ifdef CONNECTION_DEBUG
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116 ssl_set_dbg(&mSSL, my_debug, stdout);
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117 #endif
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118
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119 return 0;
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120 }
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121
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122 SSLConnection::~SSLConnection() {
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123 disconnect();
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124 x509_crt_free(&mX509PinnedCert);
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125 entropy_free(&mEntropy);
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126 if (mInitialized) {
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127 ssl_free(&mSSL);
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128 }
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129 }
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130
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131 void SSLConnection::disconnect() {
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132 if (mConnected) {
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133 ssl_close_notify(&mSSL);
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134 if (mServerFD != -1) {
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135 net_close(mServerFD);
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136 mServerFD = -1;
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137 }
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138 ssl_session_free(&mSavedSession);
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139 mConnected = false;
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140 }
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141 }
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142
45
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143 int SSLConnection::connect() {
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144 int ret = -1;
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145
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diff changeset
146 if (!mInitialized) {
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147 mErrorState = ErrUnknown;
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148 return -1;
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diff changeset
149 }
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150
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151 ret = net_connect(&mServerFD, mUrl.host().toLatin1().constData(),
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diff changeset
152 mUrl.port(443));
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diff changeset
153
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parents:
diff changeset
154 if (ret != 0) {
46
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diff changeset
155 qDebug() << "Connect failed: " << getErrorMsg(ret);
45
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156 mErrorState = NoConnection;
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diff changeset
157 return ret;
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diff changeset
158 }
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diff changeset
159
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diff changeset
160 ssl_set_bio(&mSSL, net_recv, &mServerFD,
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diff changeset
161 net_send, &mServerFD);
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diff changeset
162
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163 while ((ret = ssl_handshake(&mSSL)) != 0) {
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diff changeset
164 if (ret != POLARSSL_ERR_NET_WANT_READ &&
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165 ret != POLARSSL_ERR_NET_WANT_WRITE) {
46
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diff changeset
166 qDebug() << "SSL Handshake failed: " << getErrorMsg(ret);
45
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167 mErrorState = SSLHandshakeFailed;
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diff changeset
168 return ret;
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diff changeset
169 }
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170 }
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171
46
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diff changeset
172 ret = ssl_get_session(&mSSL, &mSavedSession);
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diff changeset
173 if (ret != 0) {
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diff changeset
174 qDebug() << "SSL get session failed: " << getErrorMsg(ret);
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diff changeset
175
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diff changeset
176 mErrorState = NoConnection;
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diff changeset
177 return ret;
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diff changeset
178 }
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diff changeset
179 printf( " ok\n [ Ciphersuite is %s ]\n",
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diff changeset
180 ssl_get_ciphersuite( &mSSL) );
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181 ret = validateCertificate();
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diff changeset
182
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diff changeset
183 if (ret == 0) {
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diff changeset
184 mConnected = true;
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diff changeset
185 }
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parents: 45
diff changeset
186 return ret;
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parents: 45
diff changeset
187 }
d28e2624c1d5 Reset connection before the next request.
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diff changeset
188
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diff changeset
189 int SSLConnection::validateCertificate()
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diff changeset
190 {
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diff changeset
191 int ret = -1;
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diff changeset
192 const x509_crt *peerCert = NULL;
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diff changeset
193
45
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194 /* we might want to set the verify function
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195 * with ssl_set_verify before to archive the
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parents:
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196 * certificate pinning. */
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197
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diff changeset
198 ret = ssl_get_verify_result(&mSSL);
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diff changeset
199
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parents:
diff changeset
200 if (ret != 0 ) {
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
201 if((ret & BADCERT_EXPIRED) != 0)
c6125d73faf4 Move SSLConnection into it's own class
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diff changeset
202 qDebug() << "server certificate has expired";
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parents:
diff changeset
203 if((ret & BADCERT_REVOKED) != 0)
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parents:
diff changeset
204 qDebug() << "server certificate has been revoked";
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diff changeset
205 if((ret & BADCERT_CN_MISMATCH) != 0)
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parents:
diff changeset
206 qDebug() << "CN mismatch";
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diff changeset
207 if((ret & BADCERT_NOT_TRUSTED) != 0)
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diff changeset
208 qDebug() << "self-signed or not signed by a trusted CA";
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diff changeset
209 ret = -1;
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parents:
diff changeset
210 #ifdef RELEASE_BUILD
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211 mErrorState = InvalidCertificate;
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diff changeset
212 return -1;
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diff changeset
213 #endif
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214 }
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parents:
diff changeset
215
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parents:
diff changeset
216 peerCert = ssl_get_peer_cert(&mSSL);
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parents:
diff changeset
217
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parents:
diff changeset
218 if (!peerCert) {
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parents:
diff changeset
219 mErrorState = InvalidCertificate;
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parents:
diff changeset
220 qDebug() << "Failed to get peer cert";
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parents:
diff changeset
221 return -1;
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
222 }
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
223
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
224 if (peerCert->raw.len == 0 ||
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
225 peerCert->raw.len != mX509PinnedCert.raw.len) {
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
226 mErrorState = InvalidCertificate;
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parents:
diff changeset
227 qDebug() << "Certificate length mismatch";
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parents:
diff changeset
228 return -1;
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
229 }
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
230
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
231 /* You can never be sure what those c++ operators do..
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
232 if (mPinnedCert != QByteArray::fromRawData(
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
233 (const char*) peerCert->raw.p,
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
234 peerCert->raw.len)) {
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
235 qDebug() << "Certificate content mismatch";
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
236 }
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
237 */
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
238
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
239 for (unsigned int i = 0; i < peerCert->raw.len; i++) {
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
240 if (peerCert->raw.p[i] != mX509PinnedCert.raw.p[i]) {
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
241 qDebug() << "Certificate content mismatch";
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
242 mErrorState = InvalidCertificate;
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
243 return -1;
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
244 }
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
245 }
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
246 return 0;
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
247 }
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
248
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
249 int SSLConnection::write (const QByteArray& request)
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
250 {
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parents:
diff changeset
251 unsigned int tries = 0;
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parents:
diff changeset
252 int ret = -1;
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
253
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
254 const unsigned char *buf = (const unsigned char *) request.constData();
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
255 size_t len = (size_t) request.size();
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
256
46
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
257 if (mNeedsReset) {
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
258 ret = reset();
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
259 if (ret != 0) {
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parents: 45
diff changeset
260 qDebug() << "Reset failed: " << getErrorMsg(ret);
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
261 return ret;
d28e2624c1d5 Reset connection before the next request.
Andre Heinecke <aheinecke@intevation.de>
parents: 45
diff changeset
262 }
d28e2624c1d5 Reset connection before the next request.
Andre Heinecke <aheinecke@intevation.de>
parents: 45
diff changeset
263 }
d28e2624c1d5 Reset connection before the next request.
Andre Heinecke <aheinecke@intevation.de>
parents: 45
diff changeset
264
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
265 qDebug() << "Sending request: " << request;
45
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
266 /* According to doc for ssl_write:
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
267 *
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
268 * When this function returns POLARSSL_ERR_NET_WANT_WRITE,
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
269 * it must be called later with the same arguments,
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
270 * until it returns a positive value.
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
271 */
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
272 do {
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
273 ret = ssl_write(&mSSL, buf, len);
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
274 if (ret >= 0) {
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
275 if ((unsigned int) ret == len) {
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
276 return 0;
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
277 } else {
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
278 qDebug() << "Write failed to write everything";
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
279 return -1;
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
280 }
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
281 }
46
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
282 if (ret != POLARSSL_ERR_NET_WANT_WRITE &&
d28e2624c1d5 Reset connection before the next request.
Andre Heinecke <aheinecke@intevation.de>
parents: 45
diff changeset
283 ret != POLARSSL_ERR_NET_WANT_READ) {
45
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
284 return ret;
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
285 }
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
286 tries++;
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
287 net_usleep(100000); /* sleep 100ms to give the socket a chance
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
288 to clean up. */
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
289 } while (tries < MAX_IO_TRIES);
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
290
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
291 return ret;
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
292 }
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
293
46
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294
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295 int SSLConnection::reset()
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296 {
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297 int ret = -1;
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298 ssl_close_notify(&mSSL);
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299
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300 ret = ssl_session_reset(&mSSL);
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301 if (ret != 0)
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302 {
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303 qDebug() << "SSL Connection reset failed: "
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304 << getErrorMsg(ret);
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305 return ret;
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306 }
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307
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308 ssl_set_session(&mSSL, &mSavedSession);
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309
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310 ret = net_connect(&mServerFD, mUrl.host().toLatin1().constData(),
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311 mUrl.port(443));
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312
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313 if (ret != 0) {
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314 mErrorState = NoConnection;
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315 qDebug() << "Connection failed." << getErrorMsg(ret);
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316 return ret;
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317 }
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318
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319 while ((ret = ssl_handshake(&mSSL)) != 0) {
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320 if (ret != POLARSSL_ERR_NET_WANT_READ &&
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321 ret != POLARSSL_ERR_NET_WANT_WRITE) {
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322 qDebug() << "SSL Handshake failed: "
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323 << getErrorMsg(ret);
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324 mErrorState = SSLHandshakeFailed;
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325 return ret;
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326 }
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327 }
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328
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329 qDebug() << "Reset connection. ";
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330 /* Validation should not be necessary as we reused a saved
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331 * session. But just to be sure. */
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332 return validateCertificate();
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333 }
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334
45
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335 QByteArray SSLConnection::read(size_t len)
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336 {
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337 unsigned char buf[len];
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338 QByteArray retval("");
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339 int ret = -1;
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340 unsigned int tries = 0;
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341
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342 mNeedsReset = true;
45
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343 do {
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344 memset (buf, 0, sizeof(buf));
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345 ret = ssl_read(&mSSL, buf, len);
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346 if (ret == 0 ||
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347 ret == POLARSSL_ERR_SSL_CONN_EOF ||
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348 ret == POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY) {
45
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349 /* EOF */
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350 return retval;
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351 }
46
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352 if (ret == POLARSSL_ERR_NET_WANT_WRITE ||
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353 ret == POLARSSL_ERR_NET_WANT_READ) {
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354 net_usleep(100000); /* sleep 100ms to give the socket a chance
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355 to recover */
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356 tries++;
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357 }
45
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358 if (ret <= 0) {
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359 qDebug() << "Read failed: " << getErrorMsg(ret);
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360 return QByteArray();
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361 }
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362 if (len < (len - (unsigned int) ret)) {
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363 /* Should never happen if ssl_read behaves */
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364 qDebug() << "integer overflow in polarSSLRead";
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365 return QByteArray();
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366 }
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367 len -= (unsigned int) ret;
46
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368 retval.append((const char *)buf, ret);
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369 } while (len > 0 && tries < MAX_IO_TRIES);
45
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370
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371 return retval;
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372 }
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373
http://wald.intevation.org/projects/trustbridge/