Mercurial > trustbridge

annotate ui/sslconnection.cpp @ 214:aab742690bee

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Fix check for selected items and wait for bytes written. According to the documentation closing the write channel should suffice. But in testing it did not sent over everything.
author Andre Heinecke <andre.heinecke@intevation.de>
date Wed, 26 Mar 2014 17:17:19 +0100
parents 0aacc291c04b
children 17e1c8f37d72
rev   line source
45
c6125d73faf4 Move SSLConnection into it's own class
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1 /* TODO: Wrap ssl_session in a class for reuse.
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2 * see programs/ssl/ssl_client2.c for example of session reuse */
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3 #include "sslconnection.h"
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4
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5 #include <QFile>
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6 #include <QUuid>
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7 #include <QApplication>
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8
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9 #define MAX_IO_TRIES 10
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10 #define MAX_RESETS 10
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11
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12 #ifdef CONNECTION_DEBUG
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13 static void my_debug(void *ctx, int level, const char *str)
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14 {
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15 fprintf((FILE *) ctx, "%s", str);
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16 fflush((FILE *) ctx);
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17 }
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18 #endif
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19
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20 QString getErrorMsg(int ret)
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21 {
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22 char errbuf[255];
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23 polarssl_strerror(ret, errbuf, 255);
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24 errbuf[254] = '\0'; /* Just to be sure */
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25 return QString::fromLatin1(errbuf);
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26 }
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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 mServerFD(-1),
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35 mErrorState(NoError)
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36 {
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37 int ret = -1;
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38
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39 memset(&mSSL, 0, sizeof(ssl_context));
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40 memset(&mSavedSession, 0, sizeof( ssl_session ) );
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41
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42 if (certificate.isEmpty()) {
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43 QFile certResource(":certs/kolab.org");
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44 certResource.open(QFile::ReadOnly);
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45 mPinnedCert = certResource.readAll();
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46 certResource.close();
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47 }
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48
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49 ret = init();
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50 if (ret == 0) {
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51 mInitialized = true;
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52 } else {
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53 qDebug() << "Initialization error: " + getErrorMsg(ret);
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54 }
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55 }
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56
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57 int SSLConnection::init()
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58 {
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59 int ret = -1;
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60 QUuid uuid = QUuid::createUuid();
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61 QString personalString = QApplication::applicationName() + uuid.toString();
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62 QByteArray personalBa = personalString.toLocal8Bit();
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63
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64 x509_crt_init(&mX509PinnedCert);
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65 entropy_init(&mEntropy);
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66
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67 ret = ssl_init(&mSSL);
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68 if (ret != 0) {
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69 /* The only documented error is malloc failed */
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70 mErrorState = ErrUnknown;
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71 return ret;
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72 }
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73
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74 /*
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75 * Initialize random generator.
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76 * Personalisation string, does not need to be random but
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77 * should be unique according to documentation.
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78 *
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79 * the ctr_drbg structure does not need to be freed explicitly.
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80 */
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81 ret = ctr_drbg_init(&mCtr_drbg, entropy_func, &mEntropy,
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82 (const unsigned char*) personalBa.constData(),
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83 personalBa.size());
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84 if (ret != 0) {
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85 ssl_free(&mSSL);
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86 mErrorState = ErrUnknown;
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87 return ret;
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88 }
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89
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90 ret = x509_crt_parse(&mX509PinnedCert,
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91 (const unsigned char*) mPinnedCert.constData(),
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92 mPinnedCert.size());
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93 if (ret != 0){
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94 ssl_free(&mSSL);
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95 mErrorState = InvalidPinnedCertificate;
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96 return ret;
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97 }
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98
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99 ssl_set_endpoint(&mSSL, SSL_IS_CLIENT);
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100 ssl_set_authmode(&mSSL, SSL_VERIFY_OPTIONAL);
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101 ssl_set_ca_chain(&mSSL, &mX509PinnedCert, NULL, NULL);
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102 ssl_set_renegotiation(&mSSL, SSL_RENEGOTIATION_DISABLED);
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103 ssl_set_rng(&mSSL, ctr_drbg_random, &mCtr_drbg);
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104 #ifdef RELEASE_BUILD
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105 ssl_set_min_version(&mSSL, SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_3);
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106 #endif
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107
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108 #ifdef CONNECTION_DEBUG
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109 ssl_set_dbg(&mSSL, my_debug, stdout);
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110 #endif
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111
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112 return 0;
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113 }
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114
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115 SSLConnection::~SSLConnection() {
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116 disconnect();
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117 x509_crt_free(&mX509PinnedCert);
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118 entropy_free(&mEntropy);
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119 if (mInitialized) {
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120 ssl_free(&mSSL);
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121 }
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122 }
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123
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124 void SSLConnection::disconnect() {
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125 if (mConnected) {
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126 ssl_close_notify(&mSSL);
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127 if (mServerFD != -1) {
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128 net_close(mServerFD);
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129 mServerFD = -1;
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130 }
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131 ssl_session_free(&mSavedSession);
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132 mConnected = false;
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133 }
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134 }
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135
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136 int SSLConnection::connect() {
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137 int ret = -1;
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138
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139 if (!mInitialized) {
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140 mErrorState = ErrUnknown;
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141 return -1;
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142 }
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143
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144 ret = net_connect(&mServerFD, mUrl.host().toLatin1().constData(),
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145 mUrl.port(443));
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146
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147 if (ret != 0) {
46
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diff changeset
148 qDebug() << "Connect failed: " << getErrorMsg(ret);
45
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149 mErrorState = NoConnection;
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150 return ret;
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151 }
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152
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153 ssl_set_bio(&mSSL, net_recv, &mServerFD,
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154 net_send, &mServerFD);
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155
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156 while ((ret = ssl_handshake(&mSSL)) != 0) {
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157 if (ret != POLARSSL_ERR_NET_WANT_READ &&
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158 ret != POLARSSL_ERR_NET_WANT_WRITE) {
46
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diff changeset
159 qDebug() << "SSL Handshake failed: " << getErrorMsg(ret);
45
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160 mErrorState = SSLHandshakeFailed;
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161 return ret;
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162 }
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163 }
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164
46
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165 ret = ssl_get_session(&mSSL, &mSavedSession);
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diff changeset
166 if (ret != 0) {
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diff changeset
167 qDebug() << "SSL get session failed: " << getErrorMsg(ret);
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diff changeset
168
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169 mErrorState = NoConnection;
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170 return ret;
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diff changeset
171 }
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diff changeset
172 printf( " ok\n [ Ciphersuite is %s ]\n",
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173 ssl_get_ciphersuite( &mSSL) );
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174 ret = validateCertificate();
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175
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176 if (ret == 0) {
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177 mConnected = true;
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178 }
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179 return ret;
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180 }
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181
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182 int SSLConnection::validateCertificate()
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183 {
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184 int ret = -1;
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185 const x509_crt *peerCert = NULL;
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186
45
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187 /* we might want to set the verify function
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188 * with ssl_set_verify before to archive the
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189 * certificate pinning. */
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190
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191 ret = ssl_get_verify_result(&mSSL);
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192
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193 if (ret != 0 ) {
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194 if((ret & BADCERT_EXPIRED) != 0)
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195 qDebug() << "server certificate has expired";
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196 if((ret & BADCERT_REVOKED) != 0)
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197 qDebug() << "server certificate has been revoked";
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198 if((ret & BADCERT_CN_MISMATCH) != 0)
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199 qDebug() << "CN mismatch";
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200 if((ret & BADCERT_NOT_TRUSTED) != 0)
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201 qDebug() << "self-signed or not signed by a trusted CA";
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202 ret = -1;
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203 #ifdef RELEASE_BUILD
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204 mErrorState = InvalidCertificate;
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205 return -1;
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206 #endif
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207 }
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208
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209 peerCert = ssl_get_peer_cert(&mSSL);
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210
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211 if (!peerCert) {
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212 mErrorState = InvalidCertificate;
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213 qDebug() << "Failed to get peer cert";
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214 return -1;
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215 }
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216
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parents:
diff changeset
217 if (peerCert->raw.len == 0 ||
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diff changeset
218 peerCert->raw.len != mX509PinnedCert.raw.len) {
c6125d73faf4 Move SSLConnection into it's own class
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219 mErrorState = InvalidCertificate;
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220 qDebug() << "Certificate length mismatch";
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221 return -1;
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diff changeset
222 }
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diff changeset
223
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224 /* You can never be sure what those c++ operators do..
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diff changeset
225 if (mPinnedCert != QByteArray::fromRawData(
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diff changeset
226 (const char*) peerCert->raw.p,
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diff changeset
227 peerCert->raw.len)) {
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228 qDebug() << "Certificate content mismatch";
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229 }
c6125d73faf4 Move SSLConnection into it's own class
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diff changeset
230 */
c6125d73faf4 Move SSLConnection into it's own class
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diff changeset
231
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diff changeset
232 for (unsigned int i = 0; i < peerCert->raw.len; i++) {
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parents:
diff changeset
233 if (peerCert->raw.p[i] != mX509PinnedCert.raw.p[i]) {
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diff changeset
234 qDebug() << "Certificate content mismatch";
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diff changeset
235 mErrorState = InvalidCertificate;
c6125d73faf4 Move SSLConnection into it's own class
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diff changeset
236 return -1;
c6125d73faf4 Move SSLConnection into it's own class
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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
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diff changeset
239 return 0;
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
240 }
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
241
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parents:
diff changeset
242 int SSLConnection::write (const QByteArray& request)
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diff changeset
243 {
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diff changeset
244 unsigned int tries = 0;
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diff changeset
245 int ret = -1;
c6125d73faf4 Move SSLConnection into it's own class
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diff changeset
246
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diff changeset
247 const unsigned char *buf = (const unsigned char *) request.constData();
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diff changeset
248 size_t len = (size_t) request.size();
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diff changeset
249
46
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diff changeset
250 if (mNeedsReset) {
d28e2624c1d5 Reset connection before the next request.
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diff changeset
251 ret = reset();
d28e2624c1d5 Reset connection before the next request.
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diff changeset
252 if (ret != 0) {
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diff changeset
253 qDebug() << "Reset failed: " << getErrorMsg(ret);
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parents: 45
diff changeset
254 return ret;
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parents: 45
diff changeset
255 }
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
256 }
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parents: 45
diff changeset
257
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diff changeset
258 qDebug() << "Sending request: " << request;
45
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
259 /* According to doc for ssl_write:
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parents:
diff changeset
260 *
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parents:
diff changeset
261 * When this function returns POLARSSL_ERR_NET_WANT_WRITE,
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
262 * it must be called later with the same arguments,
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
263 * until it returns a positive value.
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
264 */
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
265 do {
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parents:
diff changeset
266 ret = ssl_write(&mSSL, buf, len);
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
267 if (ret >= 0) {
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
268 if ((unsigned int) ret == len) {
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
269 return 0;
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
270 } else {
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
271 qDebug() << "Write failed to write everything";
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
272 return -1;
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
273 }
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
274 }
46
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
275 if (ret != POLARSSL_ERR_NET_WANT_WRITE &&
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parents: 45
diff changeset
276 ret != POLARSSL_ERR_NET_WANT_READ) {
45
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
277 return ret;
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
278 }
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
279 tries++;
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
280 net_usleep(100000); /* sleep 100ms to give the socket a chance
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
281 to clean up. */
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
282 } while (tries < MAX_IO_TRIES);
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
283
c6125d73faf4 Move SSLConnection into it's own class
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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
46
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
287
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
288 int SSLConnection::reset()
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
289 {
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parents: 45
diff changeset
290 int ret = -1;
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
291 ssl_close_notify(&mSSL);
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
292
d28e2624c1d5 Reset connection before the next request.
Andre Heinecke <aheinecke@intevation.de>
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293 ret = ssl_session_reset(&mSSL);
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294 if (ret != 0)
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295 {
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296 qDebug() << "SSL Connection reset failed: "
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297 << getErrorMsg(ret);
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298 return ret;
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299 }
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300
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301 ssl_set_session(&mSSL, &mSavedSession);
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302
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303 ret = net_connect(&mServerFD, mUrl.host().toLatin1().constData(),
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304 mUrl.port(443));
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305
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306 if (ret != 0) {
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307 mErrorState = NoConnection;
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308 qDebug() << "Connection failed." << getErrorMsg(ret);
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309 return ret;
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310 }
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311
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312 while ((ret = ssl_handshake(&mSSL)) != 0) {
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313 if (ret != POLARSSL_ERR_NET_WANT_READ &&
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314 ret != POLARSSL_ERR_NET_WANT_WRITE) {
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315 qDebug() << "SSL Handshake failed: "
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316 << getErrorMsg(ret);
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317 mErrorState = SSLHandshakeFailed;
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318 return ret;
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319 }
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320 }
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321
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322 qDebug() << "Reset connection. ";
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323 /* Validation should not be necessary as we reused a saved
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324 * session. But just to be sure. */
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325 return validateCertificate();
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326 }
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327
45
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328 QByteArray SSLConnection::read(size_t len)
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329 {
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330 unsigned char buf[len];
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331 QByteArray retval("");
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332 int ret = -1;
46
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333 unsigned int tries = 0;
45
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334
46
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335 mNeedsReset = true;
45
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336 do {
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337 memset (buf, 0, sizeof(buf));
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338 ret = ssl_read(&mSSL, buf, len);
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339 if (ret == 0 ||
46
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340 ret == POLARSSL_ERR_SSL_CONN_EOF ||
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341 ret == POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY) {
45
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342 /* EOF */
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343 return retval;
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344 }
46
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345 if (ret == POLARSSL_ERR_NET_WANT_WRITE ||
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346 ret == POLARSSL_ERR_NET_WANT_READ) {
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347 net_usleep(100000); /* sleep 100ms to give the socket a chance
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348 to recover */
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349 tries++;
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350 }
45
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351 if (ret <= 0) {
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352 qDebug() << "Read failed: " << getErrorMsg(ret);
c6125d73faf4 Move SSLConnection into it's own class
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353 return QByteArray();
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354 }
c6125d73faf4 Move SSLConnection into it's own class
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355 if (len < (len - (unsigned int) ret)) {
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356 /* Should never happen if ssl_read behaves */
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357 qDebug() << "integer overflow in polarSSLRead";
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358 return QByteArray();
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359 }
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360 len -= (unsigned int) ret;
46
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diff changeset
361 retval.append((const char *)buf, ret);
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diff changeset
362 } while (len > 0 && tries < MAX_IO_TRIES);
45
c6125d73faf4 Move SSLConnection into it's own class
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diff changeset
363
c6125d73faf4 Move SSLConnection into it's own class
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364 return retval;
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
365 }
c6125d73faf4 Move SSLConnection into it's own class
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parents:
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366
http://wald.intevation.org/projects/trustbridge/