Mercurial > trustbridge

annotate ui/sslconnection.cpp @ 540:d7ab9e734317

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author Andre Heinecke <aheinecke@intevation.de>
date Tue, 29 Apr 2014 18:07:27 +0000
parents f8b480b08532
children e32ae933391f
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 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/intevation.de");
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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: " + getPolarSSLErrorMsg(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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diff changeset
146
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diff changeset
147 if (ret != 0) {
452
f8b480b08532 Factor out polarssl error handling and start new sslhelp file
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diff changeset
148 qDebug() << "Connect failed: " << getPolarSSLErrorMsg(ret);
45
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149 mErrorState = NoConnection;
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diff changeset
150 return ret;
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diff changeset
151 }
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152
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153 ssl_set_bio(&mSSL, net_recv, &mServerFD,
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diff changeset
154 net_send, &mServerFD);
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diff changeset
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) {
452
f8b480b08532 Factor out polarssl error handling and start new sslhelp file
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parents: 409
diff changeset
159 qDebug() << "SSL Handshake failed: " << getPolarSSLErrorMsg(ret);
45
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diff changeset
160 mErrorState = SSLHandshakeFailed;
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diff changeset
161 return ret;
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162 }
c6125d73faf4 Move SSLConnection into it's own class
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163 }
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164
46
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diff changeset
165 ret = ssl_get_session(&mSSL, &mSavedSession);
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diff changeset
166 if (ret != 0) {
452
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parents: 409
diff changeset
167 qDebug() << "SSL get session failed: " << getPolarSSLErrorMsg(ret);
46
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diff changeset
168
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diff changeset
169 mErrorState = NoConnection;
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diff changeset
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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diff changeset
173 ssl_get_ciphersuite( &mSSL) );
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diff changeset
174 ret = validateCertificate();
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175
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diff changeset
176 if (ret == 0) {
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diff changeset
177 mConnected = true;
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178 }
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179 return ret;
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180 }
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diff changeset
181
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diff changeset
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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diff changeset
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)
c6125d73faf4 Move SSLConnection into it's own class
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197 qDebug() << "server certificate has been revoked";
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diff changeset
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)
c6125d73faf4 Move SSLConnection into it's own class
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201 qDebug() << "self-signed or not signed by a trusted CA";
c6125d73faf4 Move SSLConnection into it's own class
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diff changeset
202 ret = -1;
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parents:
diff changeset
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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parents:
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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 }
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
216
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
217 if (peerCert->raw.len == 0 ||
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
218 peerCert->raw.len != mX509PinnedCert.raw.len) {
c6125d73faf4 Move SSLConnection into it's own class
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diff changeset
219 mErrorState = InvalidCertificate;
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220 qDebug() << "Certificate length mismatch";
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diff changeset
221 return -1;
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parents:
diff changeset
222 }
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:
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224 /* You can never be sure what those c++ operators do..
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parents:
diff changeset
225 if (mPinnedCert != QByteArray::fromRawData(
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parents:
diff changeset
226 (const char*) peerCert->raw.p,
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
227 peerCert->raw.len)) {
c6125d73faf4 Move SSLConnection into it's own class
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diff changeset
228 qDebug() << "Certificate content mismatch";
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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
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
232 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
233 if (peerCert->raw.p[i] != mX509PinnedCert.raw.p[i]) {
c6125d73faf4 Move SSLConnection into it's own class
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parents:
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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parents:
diff changeset
236 return -1;
c6125d73faf4 Move SSLConnection into it's own class
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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 return 0;
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
240 }
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
241
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
242 int SSLConnection::write (const QByteArray& request)
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
243 {
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parents:
diff changeset
244 unsigned int tries = 0;
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parents:
diff changeset
245 int ret = -1;
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
246
c6125d73faf4 Move SSLConnection into it's own class
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parents:
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();
c6125d73faf4 Move SSLConnection into it's own class
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diff changeset
249
46
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
250 if (mNeedsReset) {
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
251 ret = reset();
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
252 if (ret != 0) {
452
f8b480b08532 Factor out polarssl error handling and start new sslhelp file
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parents: 409
diff changeset
253 qDebug() << "Reset failed: " << getPolarSSLErrorMsg(ret);
46
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
254 return ret;
d28e2624c1d5 Reset connection before the next request.
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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 }
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 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:
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
260 *
c6125d73faf4 Move SSLConnection into it's own class
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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
Andre Heinecke <aheinecke@intevation.de>
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
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
265 do {
c6125d73faf4 Move SSLConnection into it's own class
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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
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
268 if ((unsigned int) ret == len) {
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
269 return 0;
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
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
Andre Heinecke <aheinecke@intevation.de>
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 &&
d28e2624c1d5 Reset connection before the next request.
Andre Heinecke <aheinecke@intevation.de>
parents: 45
diff changeset
276 ret != POLARSSL_ERR_NET_WANT_READ) {
45
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
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
Andre Heinecke <aheinecke@intevation.de>
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
Andre Heinecke <aheinecke@intevation.de>
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
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
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 {
d28e2624c1d5 Reset connection before the next request.
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parents: 45
diff changeset
290 int ret = -1;
d28e2624c1d5 Reset connection before the next request.
Andre Heinecke <aheinecke@intevation.de>
parents: 45
diff changeset
291 ssl_close_notify(&mSSL);
d28e2624c1d5 Reset connection before the next request.
Andre Heinecke <aheinecke@intevation.de>
parents: 45
diff changeset
292
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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: "
452
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297 << getPolarSSLErrorMsg(ret);
46
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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;
452
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308 qDebug() << "Connection failed." << getPolarSSLErrorMsg(ret);
46
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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 << getPolarSSLErrorMsg(ret);
46
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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
c6125d73faf4 Move SSLConnection into it's own class
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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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diff changeset
346 ret == POLARSSL_ERR_NET_WANT_READ) {
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diff changeset
347 net_usleep(100000); /* sleep 100ms to give the socket a chance
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diff changeset
348 to recover */
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349 tries++;
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diff changeset
350 }
45
c6125d73faf4 Move SSLConnection into it's own class
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351 if (ret <= 0) {
452
f8b480b08532 Factor out polarssl error handling and start new sslhelp file
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diff changeset
352 qDebug() << "Read failed: " << getPolarSSLErrorMsg(ret);
45
c6125d73faf4 Move SSLConnection into it's own class
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353 return QByteArray();
c6125d73faf4 Move SSLConnection into it's own class
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354 }
c6125d73faf4 Move SSLConnection into it's own class
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parents:
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355 if (len < (len - (unsigned int) ret)) {
c6125d73faf4 Move SSLConnection into it's own class
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356 /* Should never happen if ssl_read behaves */
c6125d73faf4 Move SSLConnection into it's own class
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357 qDebug() << "integer overflow in polarSSLRead";
c6125d73faf4 Move SSLConnection into it's own class
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358 return QByteArray();
c6125d73faf4 Move SSLConnection into it's own class
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parents:
diff changeset
359 }
c6125d73faf4 Move SSLConnection into it's own class
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parents:
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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
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
363
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
364 return retval;
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
365 }
c6125d73faf4 Move SSLConnection into it's own class
Andre Heinecke <aheinecke@intevation.de>
parents:
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366
http://wald.intevation.org/projects/trustbridge/