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 2002-2012 Wilmer van der Gaast and others * |
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5 | \********************************************************************/ |
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6 | |
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7 | /* SSL module - NSS version */ |
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8 | |
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9 | /* Copyright 2005 Jelmer Vernooij */ |
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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., 51 Franklin St., |
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25 | Fifth Floor, Boston, MA 02110-1301 USA |
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26 | */ |
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27 | |
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28 | #include "bitlbee.h" |
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29 | #include "proxy.h" |
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30 | #include "ssl_client.h" |
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31 | #include "sock.h" |
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32 | #include <nspr.h> |
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33 | #include <prio.h> |
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34 | #include <sslproto.h> |
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35 | #include <nss.h> |
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36 | #include <pk11pub.h> |
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37 | #include <private/pprio.h> |
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38 | #include <ssl.h> |
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39 | #include <seccomon.h> |
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40 | #include <secerr.h> |
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41 | #include <sslerr.h> |
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42 | #include <assert.h> |
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43 | #include <unistd.h> |
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44 | |
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45 | int ssl_errno = 0; |
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46 | |
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47 | static gboolean initialized = FALSE; |
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48 | |
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49 | #define SSLDEBUG 0 |
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50 | |
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51 | struct scd { |
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52 | ssl_input_function func; |
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53 | gpointer data; |
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54 | int fd; |
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55 | char *hostname; |
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56 | PRFileDesc *prfd; |
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57 | gboolean established; |
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58 | gboolean verify; |
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59 | }; |
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60 | |
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61 | static gboolean ssl_connected(gpointer data, gint source, |
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62 | b_input_condition cond); |
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63 | static gboolean ssl_starttls_real(gpointer data, gint source, |
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64 | b_input_condition cond); |
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65 | |
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66 | static SECStatus nss_auth_cert(void *arg, PRFileDesc * socket, PRBool checksig, |
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67 | PRBool isserver) |
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68 | { |
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69 | return SECSuccess; |
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70 | } |
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71 | |
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72 | static SECStatus nss_bad_cert(void *arg, PRFileDesc * socket) |
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73 | { |
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74 | PRErrorCode err; |
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75 | |
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76 | if (!arg) { |
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77 | return SECFailure; |
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78 | } |
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79 | |
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80 | *(PRErrorCode *) arg = err = PORT_GetError(); |
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81 | |
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82 | switch (err) { |
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83 | case SEC_ERROR_INVALID_AVA: |
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84 | case SEC_ERROR_INVALID_TIME: |
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85 | case SEC_ERROR_BAD_SIGNATURE: |
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86 | case SEC_ERROR_EXPIRED_CERTIFICATE: |
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87 | case SEC_ERROR_UNKNOWN_ISSUER: |
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88 | case SEC_ERROR_UNTRUSTED_CERT: |
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89 | case SEC_ERROR_CERT_VALID: |
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90 | case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE: |
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91 | case SEC_ERROR_CRL_EXPIRED: |
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92 | case SEC_ERROR_CRL_BAD_SIGNATURE: |
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93 | case SEC_ERROR_EXTENSION_VALUE_INVALID: |
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94 | case SEC_ERROR_CA_CERT_INVALID: |
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95 | case SEC_ERROR_CERT_USAGES_INVALID: |
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96 | case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION: |
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97 | return SECSuccess; |
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98 | |
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99 | default: |
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100 | return SECFailure; |
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101 | } |
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102 | } |
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103 | |
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104 | void ssl_init(void) |
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105 | { |
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106 | PR_Init(PR_SYSTEM_THREAD, PR_PRIORITY_NORMAL, 1); |
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107 | // https://www.mozilla.org/projects/security/pki/nss/ref/ssl/sslfnc.html#1234224 |
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108 | // This NSS function is not intended for use with SSL, which |
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109 | // requires that the certificate and key database files be |
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110 | // opened. Relates to whole non-verification of servers for now. |
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111 | NSS_NoDB_Init(NULL); |
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112 | NSS_SetDomesticPolicy(); |
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113 | initialized = TRUE; |
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114 | } |
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115 | |
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116 | void *ssl_connect(char *host, int port, gboolean verify, |
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117 | ssl_input_function func, gpointer data) |
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118 | { |
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119 | struct scd *conn = g_new0(struct scd, 1); |
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120 | |
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121 | conn->fd = proxy_connect(host, port, ssl_connected, conn); |
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122 | conn->func = func; |
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123 | conn->data = data; |
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124 | conn->hostname = g_strdup(host); |
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125 | |
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126 | if (conn->fd < 0) { |
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127 | g_free(conn->hostname); |
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128 | g_free(conn); |
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129 | return (NULL); |
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130 | } |
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131 | |
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132 | if (!initialized) { |
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133 | ssl_init(); |
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134 | } |
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135 | |
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136 | return (conn); |
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137 | } |
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138 | |
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139 | static gboolean ssl_starttls_real(gpointer data, gint source, |
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140 | b_input_condition cond) |
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141 | { |
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142 | struct scd *conn = data; |
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143 | |
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144 | return ssl_connected(conn, conn->fd, B_EV_IO_WRITE); |
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145 | } |
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146 | |
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147 | void *ssl_starttls(int fd, char *hostname, gboolean verify, |
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148 | ssl_input_function func, gpointer data) |
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149 | { |
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150 | struct scd *conn = g_new0(struct scd, 1); |
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151 | |
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152 | conn->fd = fd; |
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153 | conn->func = func; |
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154 | conn->data = data; |
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155 | conn->hostname = g_strdup(hostname); |
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156 | |
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157 | /* For now, SSL verification is globally enabled by setting the cafile |
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158 | setting in bitlbee.conf. Commented out by default because probably |
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159 | not everyone has this file in the same place and plenty of folks |
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160 | may not have the cert of their private Jabber server in it. */ |
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161 | conn->verify = verify && global.conf->cafile; |
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162 | |
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163 | /* This function should be called via a (short) timeout instead of |
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164 | directly from here, because these SSL calls are *supposed* to be |
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165 | *completely* asynchronous and not ready yet when this function |
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166 | (or *_connect, for examle) returns. Also, errors are reported via |
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167 | the callback function, not via this function's return value. |
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168 | |
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169 | In short, doing things like this makes the rest of the code a lot |
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170 | simpler. */ |
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171 | |
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172 | b_timeout_add(1, ssl_starttls_real, conn); |
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173 | |
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174 | return conn; |
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175 | } |
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176 | |
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177 | static gboolean ssl_connected(gpointer data, gint source, |
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178 | b_input_condition cond) |
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179 | { |
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180 | struct scd *conn = data; |
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181 | |
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182 | /* Right now we don't have any verification functionality for NSS. */ |
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183 | |
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184 | if (conn->verify) { |
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185 | conn->func(conn->data, 1, NULL, cond); |
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186 | if (source >= 0) { |
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187 | closesocket(source); |
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188 | } |
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189 | g_free(conn->hostname); |
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190 | g_free(conn); |
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191 | |
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192 | return FALSE; |
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193 | } |
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194 | |
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195 | if (source == -1) { |
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196 | goto ssl_connected_failure; |
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197 | } |
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198 | |
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199 | /* Until we find out how to handle non-blocking I/O with NSS... */ |
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200 | sock_make_blocking(conn->fd); |
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201 | |
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202 | conn->prfd = SSL_ImportFD(NULL, PR_ImportTCPSocket(source)); |
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203 | if (!conn->prfd) { |
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204 | goto ssl_connected_failure; |
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205 | } |
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206 | SSL_OptionSet(conn->prfd, SSL_SECURITY, PR_TRUE); |
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207 | SSL_OptionSet(conn->prfd, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE); |
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208 | SSL_BadCertHook(conn->prfd, (SSLBadCertHandler) nss_bad_cert, NULL); |
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209 | SSL_AuthCertificateHook(conn->prfd, (SSLAuthCertificate) nss_auth_cert, |
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210 | (void *) CERT_GetDefaultCertDB()); |
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211 | SSL_SetURL(conn->prfd, conn->hostname); |
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212 | SSL_ResetHandshake(conn->prfd, PR_FALSE); |
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213 | |
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214 | if (SSL_ForceHandshake(conn->prfd)) { |
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215 | goto ssl_connected_failure; |
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216 | } |
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217 | |
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218 | conn->established = TRUE; |
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219 | conn->func(conn->data, 0, conn, cond); |
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220 | return FALSE; |
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221 | |
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222 | ssl_connected_failure: |
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223 | |
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224 | conn->func(conn->data, 0, NULL, cond); |
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225 | |
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226 | if (conn->prfd) { |
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227 | PR_Close(conn->prfd); |
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228 | } |
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229 | if (source >= 0) { |
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230 | closesocket(source); |
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231 | } |
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232 | g_free(conn->hostname); |
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233 | g_free(conn); |
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234 | |
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235 | return FALSE; |
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236 | } |
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237 | |
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238 | int ssl_read(void *conn, char *buf, int len) |
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239 | { |
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240 | int st; |
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241 | PRErrorCode PR_err; |
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242 | |
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243 | if (!((struct scd *) conn)->established) { |
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244 | ssl_errno = SSL_NOHANDSHAKE; |
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245 | return -1; |
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246 | } |
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247 | |
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248 | st = PR_Read(((struct scd *) conn)->prfd, buf, len); |
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249 | PR_err = PR_GetError(); |
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250 | |
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251 | ssl_errno = SSL_OK; |
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252 | if (PR_err == PR_WOULD_BLOCK_ERROR) { |
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253 | ssl_errno = SSL_AGAIN; |
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254 | } |
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255 | |
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256 | if (SSLDEBUG && getenv("BITLBEE_DEBUG") && st > 0) { |
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257 | len = write(STDERR_FILENO, buf, st); |
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258 | } |
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259 | |
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260 | return st; |
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261 | } |
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262 | |
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263 | int ssl_write(void *conn, const char *buf, int len) |
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264 | { |
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265 | int st; |
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266 | PRErrorCode PR_err; |
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267 | |
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268 | if (!((struct scd *) conn)->established) { |
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269 | ssl_errno = SSL_NOHANDSHAKE; |
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270 | return -1; |
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271 | } |
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272 | st = PR_Write(((struct scd *) conn)->prfd, buf, len); |
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273 | PR_err = PR_GetError(); |
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274 | |
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275 | ssl_errno = SSL_OK; |
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276 | if (PR_err == PR_WOULD_BLOCK_ERROR) { |
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277 | ssl_errno = SSL_AGAIN; |
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278 | } |
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279 | |
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280 | if (SSLDEBUG && getenv("BITLBEE_DEBUG") && st > 0) { |
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281 | len = write(2, buf, st); |
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282 | } |
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283 | |
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284 | return st; |
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285 | } |
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286 | |
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287 | int ssl_pending(void *conn) |
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288 | { |
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289 | struct scd *c = (struct scd *) conn; |
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290 | |
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291 | if (c == NULL) { |
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292 | return 0; |
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293 | } |
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294 | |
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295 | return (c->established && SSL_DataPending(c->prfd) > 0); |
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296 | } |
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297 | |
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298 | void ssl_disconnect(void *conn_) |
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299 | { |
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300 | struct scd *conn = conn_; |
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301 | |
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302 | // When we swich to NSS_Init, we should have here |
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303 | // NSS_Shutdown(); |
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304 | |
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305 | if (conn->prfd) { |
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306 | PR_Close(conn->prfd); |
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307 | } |
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308 | |
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309 | g_free(conn->hostname); |
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310 | g_free(conn); |
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311 | } |
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312 | |
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313 | int ssl_getfd(void *conn) |
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314 | { |
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315 | return (((struct scd *) conn)->fd); |
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316 | } |
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317 | |
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318 | b_input_condition ssl_getdirection(void *conn) |
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319 | { |
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320 | /* Just in case someone calls us, let's return the most likely case: */ |
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321 | return B_EV_IO_READ; |
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322 | } |
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323 | |
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324 | char *ssl_verify_strerror(int code) |
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325 | { |
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326 | return |
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327 | g_strdup |
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328 | ("SSL certificate verification not supported by BitlBee NSS code."); |
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329 | } |
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330 | |
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331 | size_t ssl_des3_encrypt(const unsigned char *key, size_t key_len, |
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332 | const unsigned char *input, size_t input_len, |
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333 | const unsigned char *iv, unsigned char **res) |
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334 | { |
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335 | #define CIPHER_MECH CKM_DES3_CBC |
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336 | #define MAX_OUTPUT_LEN 72 |
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337 | |
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338 | int len1; |
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339 | unsigned int len2; |
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340 | |
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341 | PK11Context *ctx = NULL; |
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342 | PK11SlotInfo *slot = NULL; |
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343 | SECItem keyItem; |
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344 | SECItem ivItem; |
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345 | SECItem *secParam = NULL; |
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346 | PK11SymKey *symKey = NULL; |
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347 | |
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348 | size_t rc; |
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349 | SECStatus rv; |
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350 | |
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351 | if (!initialized) { |
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352 | ssl_init(); |
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353 | } |
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354 | |
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355 | keyItem.data = (unsigned char *) key; |
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356 | keyItem.len = key_len; |
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357 | |
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358 | slot = PK11_GetBestSlot(CIPHER_MECH, NULL); |
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359 | if (slot == NULL) { |
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360 | fprintf(stderr, "PK11_GetBestSlot failed (err %d)\n", |
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361 | PR_GetError()); |
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362 | rc = 0; |
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363 | goto out; |
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364 | } |
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365 | |
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366 | symKey = |
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367 | PK11_ImportSymKey(slot, CIPHER_MECH, PK11_OriginUnwrap, CKA_ENCRYPT, |
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368 | &keyItem, NULL); |
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369 | if (symKey == NULL) { |
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370 | fprintf(stderr, "PK11_ImportSymKey failed (err %d)\n", |
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371 | PR_GetError()); |
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372 | rc = 0; |
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373 | goto out; |
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374 | } |
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375 | |
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376 | ivItem.data = (unsigned char *) iv; |
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377 | /* See msn_soap_passport_sso_handle_response in protocols/msn/soap.c */ |
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378 | ivItem.len = 8; |
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379 | |
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380 | secParam = PK11_ParamFromIV(CIPHER_MECH, &ivItem); |
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381 | if (secParam == NULL) { |
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382 | fprintf(stderr, "PK11_ParamFromIV failed (err %d)\n", |
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383 | PR_GetError()); |
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384 | rc = 0; |
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385 | goto out; |
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386 | } |
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387 | |
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388 | ctx = |
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389 | PK11_CreateContextBySymKey(CIPHER_MECH, CKA_ENCRYPT, symKey, |
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390 | secParam); |
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391 | if (ctx == NULL) { |
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392 | fprintf(stderr, "PK11_CreateContextBySymKey failed (err %d)\n", |
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393 | PR_GetError()); |
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394 | rc = 0; |
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395 | goto out; |
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396 | } |
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397 | |
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398 | *res = g_new0(unsigned char, MAX_OUTPUT_LEN); |
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399 | |
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400 | rv = PK11_CipherOp(ctx, *res, &len1, MAX_OUTPUT_LEN, |
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401 | (unsigned char *) input, input_len); |
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402 | if (rv != SECSuccess) { |
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403 | fprintf(stderr, "PK11_CipherOp failed (err %d)\n", |
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404 | PR_GetError()); |
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405 | rc = 0; |
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406 | goto out; |
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407 | } |
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408 | |
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409 | assert(len1 <= MAX_OUTPUT_LEN); |
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410 | |
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411 | rv = PK11_DigestFinal(ctx, *res + len1, &len2, |
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412 | (unsigned int) MAX_OUTPUT_LEN - len1); |
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413 | if (rv != SECSuccess) { |
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414 | fprintf(stderr, "PK11_DigestFinal failed (err %d)\n", |
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415 | PR_GetError()); |
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416 | rc = 0; |
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417 | goto out; |
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418 | } |
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419 | |
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420 | rc = len1 + len2; |
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421 | |
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422 | out: |
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423 | if (ctx) { |
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424 | PK11_DestroyContext(ctx, PR_TRUE); |
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425 | } |
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426 | if (symKey) { |
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427 | PK11_FreeSymKey(symKey); |
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428 | } |
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429 | if (secParam) { |
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430 | SECITEM_FreeItem(secParam, PR_TRUE); |
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431 | } |
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432 | if (slot) { |
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433 | PK11_FreeSlot(slot); |
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434 | } |
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435 | |
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436 | return rc; |
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437 | } |
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