1 | /********************************************************************\ |
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2 | * BitlBee -- An IRC to other IM-networks gateway * |
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3 | * * |
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4 | * Copyright 2002-2004 Wilmer van der Gaast and others * |
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5 | \********************************************************************/ |
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6 | |
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7 | /* SSL module - SSPI backend */ |
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8 | |
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9 | /* Copyright (C) 2005 Jelmer Vernooij <jelmer@samba.org> */ |
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10 | |
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11 | /* |
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12 | This program is free software; you can redistribute it and/or modify |
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13 | it under the terms of the GNU General Public License as published by |
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14 | the Free Software Foundation; either version 2 of the License, or |
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15 | (at your option) any later version. |
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16 | |
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17 | This program is distributed in the hope that it will be useful, |
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18 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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19 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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20 | GNU General Public License for more details. |
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21 | |
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22 | You should have received a copy of the GNU General Public License with |
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23 | the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL; |
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24 | if not, write to the Free Software Foundation, Inc., 59 Temple Place, |
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25 | Suite 330, Boston, MA 02111-1307 USA |
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26 | */ |
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27 | |
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28 | #include "ssl_client.h" |
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29 | #include <windows.h> |
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30 | #define SECURITY_WIN32 |
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31 | #include <security.h> |
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32 | #include <sspi.h> |
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33 | #include <schannel.h> |
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34 | #include "sock.h" |
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35 | |
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36 | static gboolean initialized = FALSE; |
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37 | int ssl_errno; |
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38 | |
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39 | struct scd |
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40 | { |
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41 | int fd; |
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42 | ssl_input_function func; |
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43 | gpointer data; |
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44 | gboolean established; |
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45 | CredHandle cred; /* SSL credentials */ |
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46 | CtxtHandle context; /* SSL context */ |
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47 | SecPkgContext_StreamSizes sizes; |
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48 | |
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49 | char *host; |
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50 | |
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51 | char *pending_raw_data; |
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52 | gsize pending_raw_data_len; |
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53 | char *pending_data; |
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54 | gsize pending_data_len; |
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55 | }; |
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56 | |
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57 | static void ssl_connected(gpointer, gint, GaimInputCondition); |
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58 | |
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59 | void sspi_global_init(void) |
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60 | { |
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61 | /* FIXME */ |
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62 | } |
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63 | |
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64 | void sspi_global_deinit(void) |
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65 | { |
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66 | /* FIXME */ |
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67 | } |
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68 | |
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69 | void *ssl_connect(char *host, int port, ssl_input_function func, gpointer data) |
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70 | { |
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71 | struct scd *conn = g_new0(struct scd, 1); |
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72 | |
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73 | conn->fd = proxy_connect(host, port, ssl_connected, conn); |
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74 | sock_make_nonblocking(conn->fd); |
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75 | conn->func = func; |
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76 | conn->data = data; |
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77 | conn->host = g_strdup(host); |
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78 | |
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79 | if (conn->fd < 0) |
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80 | { |
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81 | g_free(conn); |
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82 | return NULL; |
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83 | } |
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84 | |
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85 | if (!initialized) |
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86 | { |
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87 | sspi_global_init(); |
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88 | initialized = TRUE; |
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89 | atexit(sspi_global_deinit); |
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90 | } |
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91 | |
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92 | return conn; |
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93 | } |
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94 | |
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95 | static void ssl_connected(gpointer _conn, gint fd, GaimInputCondition cond) |
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96 | { |
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97 | struct scd *conn = _conn; |
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98 | SCHANNEL_CRED ssl_cred; |
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99 | TimeStamp timestamp; |
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100 | SecBuffer ibuf[2],obuf[1]; |
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101 | SecBufferDesc ibufs,obufs; |
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102 | ULONG req = ISC_REQ_REPLAY_DETECT | ISC_REQ_SEQUENCE_DETECT | |
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103 | ISC_REQ_CONFIDENTIALITY | ISC_REQ_USE_SESSION_KEY | |
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104 | ISC_REQ_ALLOCATE_MEMORY | ISC_REQ_STREAM | ISC_REQ_EXTENDED_ERROR | |
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105 | ISC_REQ_MANUAL_CRED_VALIDATION; |
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106 | ULONG a; |
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107 | gsize size = 0; |
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108 | gchar *data = NULL; |
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109 | |
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110 | memset(&ssl_cred, 0, sizeof(SCHANNEL_CRED)); |
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111 | ssl_cred.dwVersion = SCHANNEL_CRED_VERSION; |
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112 | ssl_cred.grbitEnabledProtocols = SP_PROT_SSL3_CLIENT; |
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113 | |
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114 | SECURITY_STATUS st = AcquireCredentialsHandle(NULL, UNISP_NAME, SECPKG_CRED_OUTBOUND, NULL, &ssl_cred, NULL, NULL, &conn->cred, ×tamp); |
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115 | |
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116 | if (st != SEC_E_OK) { |
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117 | conn->func(conn->data, NULL, cond); |
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118 | return; |
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119 | } |
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120 | |
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121 | do { |
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122 | /* initialize buffers */ |
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123 | ibuf[0].cbBuffer = size; ibuf[0].pvBuffer = data; |
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124 | ibuf[1].cbBuffer = 0; ibuf[1].pvBuffer = NULL; |
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125 | obuf[0].cbBuffer = 0; obuf[0].pvBuffer = NULL; |
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126 | ibuf[0].BufferType = obuf[0].BufferType = SECBUFFER_TOKEN; |
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127 | ibuf[1].BufferType = SECBUFFER_EMPTY; |
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128 | |
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129 | /* initialize buffer descriptors */ |
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130 | ibufs.ulVersion = obufs.ulVersion = SECBUFFER_VERSION; |
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131 | ibufs.cBuffers = 2; obufs.cBuffers = 1; |
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132 | ibufs.pBuffers = ibuf; obufs.pBuffers = obuf; |
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133 | |
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134 | st = InitializeSecurityContext(&conn->cred, size?&conn->context:NULL, conn->host, req, 0, SECURITY_NETWORK_DREP, size?&ibufs:NULL, 0, &conn->context, &obufs, &a, ×tamp); |
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135 | if (obuf[0].pvBuffer && obuf[0].cbBuffer) { |
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136 | /* FIXME: Check return value */ |
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137 | send(conn->fd, obuf[0].pvBuffer, obuf[0].cbBuffer, 0); |
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138 | } |
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139 | |
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140 | switch (st) { |
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141 | case SEC_I_INCOMPLETE_CREDENTIALS: |
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142 | break; |
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143 | case SEC_I_CONTINUE_NEEDED: |
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144 | break; |
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145 | case SEC_E_INCOMPLETE_MESSAGE: |
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146 | break; |
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147 | case SEC_E_OK: |
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148 | break; |
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149 | } |
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150 | |
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151 | QueryContextAttributes(&conn->context, SECPKG_ATTR_STREAM_SIZES, &conn->sizes); |
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152 | } while (1); |
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153 | |
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154 | conn->func(conn->data, conn, cond); |
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155 | } |
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156 | |
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157 | int ssl_read(void *conn, char *retdata, int len) |
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158 | { |
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159 | struct scd *scd = conn; |
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160 | SecBufferDesc msg; |
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161 | SecBuffer buf[4]; |
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162 | int ret = -1, i; |
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163 | char *data = g_malloc(scd->sizes.cbHeader + scd->sizes.cbMaximumMessage + scd->sizes.cbTrailer); |
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164 | |
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165 | /* FIXME: Try to read some data */ |
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166 | |
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167 | msg.ulVersion = SECBUFFER_VERSION; |
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168 | msg.cBuffers = 4; |
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169 | msg.pBuffers = buf; |
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170 | |
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171 | buf[0].BufferType = SECBUFFER_DATA; |
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172 | buf[0].cbBuffer = len; |
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173 | buf[0].pvBuffer = data; |
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174 | |
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175 | buf[1].BufferType = SECBUFFER_EMPTY; |
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176 | buf[2].BufferType = SECBUFFER_EMPTY; |
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177 | buf[3].BufferType = SECBUFFER_EMPTY; |
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178 | |
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179 | SECURITY_STATUS st = DecryptMessage(&scd->context, &msg, 0, NULL); |
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180 | |
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181 | if (st != SEC_E_OK) { |
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182 | /* FIXME */ |
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183 | return -1; |
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184 | } |
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185 | |
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186 | for (i = 0; i < 4; i++) { |
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187 | if (buf[i].BufferType == SECBUFFER_DATA) { |
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188 | memcpy(retdata, buf[i].pvBuffer, len); |
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189 | ret = len; |
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190 | } |
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191 | } |
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192 | |
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193 | g_free(data); |
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194 | return -1; |
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195 | } |
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196 | |
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197 | int ssl_write(void *conn, const char *userdata, int len) |
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198 | { |
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199 | struct scd *scd = conn; |
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200 | SecBuffer buf[4]; |
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201 | SecBufferDesc msg; |
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202 | char *data; |
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203 | int ret; |
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204 | |
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205 | msg.ulVersion = SECBUFFER_VERSION; |
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206 | msg.cBuffers = 4; |
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207 | msg.pBuffers = buf; |
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208 | |
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209 | data = g_malloc(scd->sizes.cbHeader + scd->sizes.cbMaximumMessage + scd->sizes.cbTrailer); |
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210 | memcpy(data + scd->sizes.cbHeader, userdata, len); |
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211 | |
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212 | buf[0].BufferType = SECBUFFER_STREAM_HEADER; |
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213 | buf[0].cbBuffer = scd->sizes.cbHeader; |
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214 | buf[0].pvBuffer = data; |
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215 | |
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216 | buf[1].BufferType = SECBUFFER_DATA; |
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217 | buf[1].cbBuffer = len; |
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218 | buf[1].pvBuffer = data + scd->sizes.cbHeader; |
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219 | |
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220 | buf[2].BufferType = SECBUFFER_STREAM_TRAILER; |
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221 | buf[2].cbBuffer = scd->sizes.cbTrailer; |
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222 | buf[2].pvBuffer = data + scd->sizes.cbHeader + len; |
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223 | buf[3].BufferType = SECBUFFER_EMPTY; |
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224 | |
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225 | SECURITY_STATUS st = EncryptMessage(&scd->context, 0, &msg, 0); |
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226 | |
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227 | ret = send(scd->fd, data, |
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228 | buf[0].cbBuffer + buf[1].cbBuffer + buf[2].cbBuffer, 0); |
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229 | |
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230 | g_free(data); |
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231 | |
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232 | return ret; |
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233 | } |
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234 | |
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235 | void ssl_disconnect(void *conn) |
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236 | { |
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237 | struct scd *scd = conn; |
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238 | |
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239 | SecBufferDesc msg; |
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240 | SecBuffer buf; |
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241 | DWORD dw; |
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242 | |
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243 | dw = SCHANNEL_SHUTDOWN; |
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244 | buf.cbBuffer = sizeof(dw); |
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245 | buf.BufferType = SECBUFFER_TOKEN; |
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246 | buf.pvBuffer = &dw; |
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247 | |
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248 | msg.ulVersion = SECBUFFER_VERSION; |
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249 | msg.cBuffers = 1; |
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250 | msg.pBuffers = &buf; |
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251 | |
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252 | SECURITY_STATUS st = ApplyControlToken(&scd->context, &msg); |
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253 | |
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254 | if (st != SEC_E_OK) { |
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255 | /* FIXME */ |
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256 | } |
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257 | |
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258 | /* FIXME: call InitializeSecurityContext(Schannel), passing |
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259 | * in empty buffers*/ |
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260 | |
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261 | DeleteSecurityContext(&scd->context); |
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262 | |
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263 | FreeCredentialsHandle(&scd->cred); |
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264 | |
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265 | closesocket(scd->fd); |
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266 | g_free(scd->host); |
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267 | g_free(scd); |
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268 | } |
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269 | |
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270 | int ssl_getfd(void *conn) |
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271 | { |
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272 | return ((struct scd*)conn)->fd; |
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273 | } |
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274 | |
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275 | GaimInputCondition ssl_getdirection( void *conn ) |
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276 | { |
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277 | return GAIM_INPUT_WRITE; /* FIXME: or GAIM_INPUT_READ */ |
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278 | } |
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