Mercurial > trustbridge

annotate ui/sslconnection.cpp @ 747:b959304d6ecf

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author Andre Heinecke <andre.heinecke@intevation.de>
date Fri, 04 Jul 2014 16:27:37 +0200
parents e32ae933391f
children
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 #include "sslhelp.h"
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12
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13 #include <QFile>
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14 #include <QUuid>
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15 #include <QApplication>
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16
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17 #define MAX_IO_TRIES 10
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18 #define MAX_RESETS 10
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19
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20 #ifdef CONNECTION_DEBUG
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21 static void my_debug(void *ctx, int level, const char *str)
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22 {
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23 fprintf((FILE *) ctx, "%s", str);
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24 fflush((FILE *) ctx);
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25 }
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26 #endif
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27
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28 SSLConnection::SSLConnection(const QString& url,
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29 const QByteArray& certificate):
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30 mUrl(url),
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31 mPinnedCert(certificate),
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32 mInitialized(false),
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33 mConnected(false),
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34 mNeedsReset(false),
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35 mServerFD(-1),
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36 mErrorState(NoError)
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37 {
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38 int ret = -1;
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39
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40 memset(&mSSL, 0, sizeof(ssl_context));
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41 memset(&mSavedSession, 0, sizeof( ssl_session ) );
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42
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43 if (certificate.isEmpty()) {
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44 QFile certResource(":certs/intevation.de");
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45 certResource.open(QFile::ReadOnly);
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46 mPinnedCert = certResource.readAll();
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47 certResource.close();
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48 }
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49
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50 ret = init();
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51 if (ret == 0) {
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52 mInitialized = true;
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53 } else {
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54 qDebug() << "Initialization error: " + getPolarSSLErrorMsg(ret);
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55 }
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56 }
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57
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58 int SSLConnection::init()
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59 {
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60 int ret = -1;
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61 QUuid uuid = QUuid::createUuid();
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62 QString personalString = QApplication::applicationName() + uuid.toString();
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63 QByteArray personalBa = personalString.toLocal8Bit();
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64
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65 x509_crt_init(&mX509PinnedCert);
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66 entropy_init(&mEntropy);
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67
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68 ret = ssl_init(&mSSL);
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69 if (ret != 0) {
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70 /* The only documented error is malloc failed */
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71 mErrorState = ErrUnknown;
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72 return ret;
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73 }
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74
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75 /*
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76 * Initialize random generator.
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77 * Personalisation string, does not need to be random but
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78 * should be unique according to documentation.
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79 *
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80 * the ctr_drbg structure does not need to be freed explicitly.
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81 */
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82 ret = ctr_drbg_init(&mCtr_drbg, entropy_func, &mEntropy,
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83 (const unsigned char*) personalBa.constData(),
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84 personalBa.size());
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85 if (ret != 0) {
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86 ssl_free(&mSSL);
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87 mErrorState = ErrUnknown;
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88 return ret;
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89 }
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90
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91 ret = x509_crt_parse(&mX509PinnedCert,
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92 (const unsigned char*) mPinnedCert.constData(),
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93 mPinnedCert.size());
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94 if (ret != 0){
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95 ssl_free(&mSSL);
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96 mErrorState = InvalidPinnedCertificate;
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97 return ret;
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98 }
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99
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100 ssl_set_endpoint(&mSSL, SSL_IS_CLIENT);
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101 ssl_set_authmode(&mSSL, SSL_VERIFY_OPTIONAL);
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102 ssl_set_ca_chain(&mSSL, &mX509PinnedCert, NULL, NULL);
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103 ssl_set_renegotiation(&mSSL, SSL_RENEGOTIATION_DISABLED);
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104 ssl_set_rng(&mSSL, ctr_drbg_random, &mCtr_drbg);
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105 #ifdef RELEASE_BUILD
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106 ssl_set_min_version(&mSSL, SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_3);
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107 #endif
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108
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109 #ifdef CONNECTION_DEBUG
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110 ssl_set_dbg(&mSSL, my_debug, stdout);
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111 #endif
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112
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113 return 0;
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114 }
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115
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116 SSLConnection::~SSLConnection() {
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117 disconnect();
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118 x509_crt_free(&mX509PinnedCert);
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119 entropy_free(&mEntropy);
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120 if (mInitialized) {
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121 ssl_free(&mSSL);
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122 }
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123 }
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124
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125 void SSLConnection::disconnect() {
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126 if (mConnected) {
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127 ssl_close_notify(&mSSL);
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128 if (mServerFD != -1) {
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129 net_close(mServerFD);
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130 mServerFD = -1;
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131 }
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132 ssl_session_free(&mSavedSession);
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133 mConnected = false;
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134 }
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135 }
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136
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137 int SSLConnection::connect() {
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138 int ret = -1;
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139
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140 if (!mInitialized) {
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141 mErrorState = ErrUnknown;
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142 return -1;
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143 }
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144
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145 ret = net_connect(&mServerFD, mUrl.host().toLatin1().constData(),
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diff changeset
146 mUrl.port(443));
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diff changeset
147
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diff changeset
148 if (ret != 0) {
452
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parents: 409
diff changeset
149 qDebug() << "Connect failed: " << getPolarSSLErrorMsg(ret);
45
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150 mErrorState = NoConnection;
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diff changeset
151 return ret;
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152 }
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153
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154 ssl_set_bio(&mSSL, net_recv, &mServerFD,
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diff changeset
155 net_send, &mServerFD);
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diff changeset
156
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157 while ((ret = ssl_handshake(&mSSL)) != 0) {
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158 if (ret != POLARSSL_ERR_NET_WANT_READ &&
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159 ret != POLARSSL_ERR_NET_WANT_WRITE) {
452
f8b480b08532 Factor out polarssl error handling and start new sslhelp file
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parents: 409
diff changeset
160 qDebug() << "SSL Handshake failed: " << getPolarSSLErrorMsg(ret);
45
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161 mErrorState = SSLHandshakeFailed;
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diff changeset
162 return ret;
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163 }
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164 }
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165
46
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diff changeset
166 ret = ssl_get_session(&mSSL, &mSavedSession);
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diff changeset
167 if (ret != 0) {
452
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diff changeset
168 qDebug() << "SSL get session failed: " << getPolarSSLErrorMsg(ret);
46
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diff changeset
169
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170 mErrorState = NoConnection;
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diff changeset
171 return ret;
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diff changeset
172 }
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diff changeset
173 printf( " ok\n [ Ciphersuite is %s ]\n",
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diff changeset
174 ssl_get_ciphersuite( &mSSL) );
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175 ret = validateCertificate();
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diff changeset
176
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diff changeset
177 if (ret == 0) {
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178 mConnected = true;
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179 }
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180 return ret;
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diff changeset
181 }
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diff changeset
182
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diff changeset
183 int SSLConnection::validateCertificate()
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184 {
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185 int ret = -1;
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186 const x509_crt *peerCert = NULL;
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187
45
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188 /* we might want to set the verify function
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189 * with ssl_set_verify before to archive the
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190 * certificate pinning. */
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191
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diff changeset
192 ret = ssl_get_verify_result(&mSSL);
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diff changeset
193
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194 if (ret != 0 ) {
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195 if((ret & BADCERT_EXPIRED) != 0)
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196 qDebug() << "server certificate has expired";
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diff changeset
197 if((ret & BADCERT_REVOKED) != 0)
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diff changeset
198 qDebug() << "server certificate has been revoked";
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diff changeset
199 if((ret & BADCERT_CN_MISMATCH) != 0)
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diff changeset
200 qDebug() << "CN mismatch";
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diff changeset
201 if((ret & BADCERT_NOT_TRUSTED) != 0)
c6125d73faf4 Move SSLConnection into it's own class
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diff changeset
202 qDebug() << "self-signed or not signed by a trusted CA";
c6125d73faf4 Move SSLConnection into it's own class
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diff changeset
203 ret = -1;
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parents:
diff changeset
204 #ifdef RELEASE_BUILD
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205 mErrorState = InvalidCertificate;
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206 return -1;
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diff changeset
207 #endif
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208 }
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diff changeset
209
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210 peerCert = ssl_get_peer_cert(&mSSL);
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diff changeset
211
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parents:
diff changeset
212 if (!peerCert) {
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213 mErrorState = InvalidCertificate;
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diff changeset
214 qDebug() << "Failed to get peer cert";
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215 return -1;
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parents:
diff changeset
216 }
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
217
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
218 if (peerCert->raw.len == 0 ||
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
219 peerCert->raw.len != mX509PinnedCert.raw.len) {
c6125d73faf4 Move SSLConnection into it's own class
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diff changeset
220 mErrorState = InvalidCertificate;
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diff changeset
221 qDebug() << "Certificate length mismatch";
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parents:
diff changeset
222 return -1;
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
223 }
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
224
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
225 /* You can never be sure what those c++ operators do..
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parents:
diff changeset
226 if (mPinnedCert != QByteArray::fromRawData(
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
227 (const char*) peerCert->raw.p,
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
228 peerCert->raw.len)) {
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diff changeset
229 qDebug() << "Certificate content mismatch";
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parents:
diff changeset
230 }
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
231 */
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
232
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
233 for (unsigned int i = 0; i < peerCert->raw.len; i++) {
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
234 if (peerCert->raw.p[i] != mX509PinnedCert.raw.p[i]) {
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 mErrorState = InvalidCertificate;
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
237 return -1;
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
238 }
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
239 }
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
240 return 0;
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
241 }
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
242
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
243 int SSLConnection::write (const QByteArray& request)
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
244 {
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parents:
diff changeset
245 unsigned int tries = 0;
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parents:
diff changeset
246 int ret = -1;
c6125d73faf4 Move SSLConnection into it's own class
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diff changeset
247
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
248 const unsigned char *buf = (const unsigned char *) request.constData();
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diff changeset
249 size_t len = (size_t) request.size();
c6125d73faf4 Move SSLConnection into it's own class
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diff changeset
250
46
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
251 if (mNeedsReset) {
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
252 ret = reset();
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
253 if (ret != 0) {
452
f8b480b08532 Factor out polarssl error handling and start new sslhelp file
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parents: 409
diff changeset
254 qDebug() << "Reset failed: " << getPolarSSLErrorMsg(ret);
46
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parents: 45
diff changeset
255 return ret;
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
256 }
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
257 }
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
258
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
259 qDebug() << "Sending request: " << request;
45
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
260 /* According to doc for ssl_write:
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
261 *
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
262 * 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
263 * 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
264 * until it returns a positive value.
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
265 */
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
266 do {
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
267 ret = ssl_write(&mSSL, buf, len);
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
268 if (ret >= 0) {
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
269 if ((unsigned int) ret == len) {
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
270 return 0;
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
271 } else {
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
272 qDebug() << "Write failed to write everything";
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
273 return -1;
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
274 }
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
275 }
46
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
276 if (ret != POLARSSL_ERR_NET_WANT_WRITE &&
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Andre Heinecke <aheinecke@intevation.de>
parents: 45
diff changeset
277 ret != POLARSSL_ERR_NET_WANT_READ) {
45
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
278 return ret;
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
279 }
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
280 tries++;
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
281 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
282 to clean up. */
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
283 } while (tries < MAX_IO_TRIES);
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
284
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
285 return ret;
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
286 }
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
287
46
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
288
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
289 int SSLConnection::reset()
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
290 {
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
291 int ret = -1;
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292 ssl_close_notify(&mSSL);
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293
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294 ret = ssl_session_reset(&mSSL);
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295 if (ret != 0)
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296 {
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297 qDebug() << "SSL Connection reset failed: "
452
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298 << getPolarSSLErrorMsg(ret);
46
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299 return ret;
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300 }
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301
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302 ssl_set_session(&mSSL, &mSavedSession);
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303
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304 ret = net_connect(&mServerFD, mUrl.host().toLatin1().constData(),
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305 mUrl.port(443));
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306
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307 if (ret != 0) {
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308 mErrorState = NoConnection;
452
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309 qDebug() << "Connection failed." << getPolarSSLErrorMsg(ret);
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310 return ret;
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311 }
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312
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313 while ((ret = ssl_handshake(&mSSL)) != 0) {
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314 if (ret != POLARSSL_ERR_NET_WANT_READ &&
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315 ret != POLARSSL_ERR_NET_WANT_WRITE) {
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316 qDebug() << "SSL Handshake failed: "
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317 << getPolarSSLErrorMsg(ret);
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318 mErrorState = SSLHandshakeFailed;
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319 return ret;
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320 }
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321 }
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322
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323 qDebug() << "Reset connection. ";
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324 /* Validation should not be necessary as we reused a saved
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325 * session. But just to be sure. */
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326 return validateCertificate();
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327 }
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328
45
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329 QByteArray SSLConnection::read(size_t len)
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330 {
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331 unsigned char buf[len];
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332 QByteArray retval("");
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333 int ret = -1;
46
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334 unsigned int tries = 0;
45
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335
46
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336 mNeedsReset = true;
45
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337 do {
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338 memset (buf, 0, sizeof(buf));
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339 ret = ssl_read(&mSSL, buf, len);
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340 if (ret == 0 ||
46
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341 ret == POLARSSL_ERR_SSL_CONN_EOF ||
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342 ret == POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY) {
45
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343 /* EOF */
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344 return retval;
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345 }
46
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346 if (ret == POLARSSL_ERR_NET_WANT_WRITE ||
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347 ret == POLARSSL_ERR_NET_WANT_READ) {
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348 net_usleep(100000); /* sleep 100ms to give the socket a chance
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349 to recover */
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350 tries++;
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351 }
45
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diff changeset
352 if (ret <= 0) {
452
f8b480b08532 Factor out polarssl error handling and start new sslhelp file
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diff changeset
353 qDebug() << "Read failed: " << getPolarSSLErrorMsg(ret);
45
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354 return QByteArray();
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355 }
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356 if (len < (len - (unsigned int) ret)) {
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357 /* Should never happen if ssl_read behaves */
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358 qDebug() << "integer overflow in polarSSLRead";
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359 return QByteArray();
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360 }
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parents:
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361 len -= (unsigned int) ret;
46
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diff changeset
362 retval.append((const char *)buf, ret);
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diff changeset
363 } while (len > 0 && tries < MAX_IO_TRIES);
45
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
364
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365 return retval;
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parents:
diff changeset
366 }
c6125d73faf4 Move SSLConnection into it's own class
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parents:
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367
http://wald.intevation.org/projects/trustbridge/