Mercurial > hg > nginx-site
annotate xml/en/docs/stream/ngx_stream_ssl_module.xml @ 1754:c6c9ed2ea7e4
Updated with Netcraft July 2016 Web Server Survey stats.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Tue, 19 Jul 2016 23:13:21 +0300 |
parents | 0dfb7628bfee |
children | 3fa0944ddc6a |
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1 <?xml version="1.0"?> |
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2 |
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3 <!-- |
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4 Copyright (C) Nginx, Inc. |
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5 --> |
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6 |
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7 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> |
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8 |
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9 <module name="Module ngx_stream_ssl_module" |
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10 link="/en/docs/stream/ngx_stream_ssl_module.html" |
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11 lang="en" |
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12 rev="9"> |
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13 |
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14 <section id="summary"> |
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15 |
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16 <para> |
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17 The <literal>ngx_stream_ssl_module</literal> module (1.9.0) |
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18 provides the necessary support for a stream proxy server to work with |
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19 the SSL/TLS protocol. |
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20 This module is not built by default, it should be enabled with the |
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21 <literal>--with-stream_ssl_module</literal> |
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22 configuration parameter. |
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23 </para> |
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24 |
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25 </section> |
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26 |
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27 |
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28 <section id="example" name="Example Configuration"> |
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29 |
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30 <para> |
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31 To reduce the processor load, it is recommended to |
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32 <list type="bullet"> |
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33 |
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34 <listitem> |
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35 set the number of worker processes equal to the number of processors, |
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36 </listitem> |
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37 |
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38 <listitem> |
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39 enable the shared session cache, |
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40 </listitem> |
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41 |
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42 <listitem> |
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43 disable the built-in session cache, |
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44 </listitem> |
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45 |
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46 <listitem> |
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47 and possibly increase the session lifetime (by default, 5 minutes): |
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48 </listitem> |
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49 |
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50 </list> |
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51 |
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52 <example> |
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53 <emphasis>worker_processes auto;</emphasis> |
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54 |
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55 stream { |
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56 |
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57 ... |
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58 |
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59 server { |
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60 listen 12345 ssl; |
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61 |
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62 ssl_protocols TLSv1 TLSv1.1 TLSv1.2; |
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63 ssl_ciphers AES128-SHA:AES256-SHA:RC4-SHA:DES-CBC3-SHA:RC4-MD5; |
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64 ssl_certificate /usr/local/nginx/conf/cert.pem; |
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65 ssl_certificate_key /usr/local/nginx/conf/cert.key; |
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66 <emphasis>ssl_session_cache shared:SSL:10m;</emphasis> |
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67 <emphasis>ssl_session_timeout 10m;</emphasis> |
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68 |
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69 ... |
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70 } |
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71 </example> |
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72 </para> |
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73 |
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74 </section> |
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75 |
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76 |
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77 <section id="directives" name="Directives"> |
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78 |
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79 <directive name="ssl_certificate"> |
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80 <syntax><value>file</value></syntax> |
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81 <default/> |
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82 <context>stream</context> |
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83 <context>server</context> |
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84 |
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85 <para> |
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86 Specifies a <value>file</value> with the certificate in the PEM format |
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87 for the given server. |
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88 If intermediate certificates should be specified in addition to a primary |
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89 certificate, they should be specified in the same file in the following |
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90 order: the primary certificate comes first, then the intermediate certificates. |
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91 A secret key in the PEM format may be placed in the same file. |
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92 </para> |
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93 |
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94 <para> |
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95 Since version 1.11.0, |
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96 this directive can be specified multiple times |
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97 to load certificates of different types, for example, RSA and ECDSA: |
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98 <example> |
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99 server { |
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100 listen 12345 ssl; |
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101 |
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102 ssl_certificate example.com.rsa.crt; |
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103 ssl_certificate_key example.com.rsa.key; |
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104 |
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105 ssl_certificate example.com.ecdsa.crt; |
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106 ssl_certificate_key example.com.ecdsa.key; |
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107 |
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108 ... |
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109 } |
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110 </example> |
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111 <note> |
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112 Only OpenSSL 1.0.2 or higher supports separate certificate chains |
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113 for different certificates. |
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114 With older versions, only one certificate chain can be used. |
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115 </note> |
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116 </para> |
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117 |
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118 </directive> |
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119 |
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120 |
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121 <directive name="ssl_certificate_key"> |
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122 <syntax><value>file</value></syntax> |
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123 <default/> |
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124 <context>stream</context> |
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125 <context>server</context> |
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126 |
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127 <para> |
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128 Specifies a <value>file</value> with the secret key in the PEM format |
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129 for the given server. |
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130 </para> |
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131 |
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132 <para> |
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133 The value |
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134 <literal>engine</literal>:<value>name</value>:<value>id</value> |
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135 can be specified instead of the <value>file</value>, |
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136 which loads a secret key with a specified <value>id</value> |
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137 from the OpenSSL engine <value>name</value>. |
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138 </para> |
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139 |
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140 </directive> |
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141 |
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142 |
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143 <directive name="ssl_ciphers"> |
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144 <syntax><value>ciphers</value></syntax> |
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145 <default>HIGH:!aNULL:!MD5</default> |
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146 <context>stream</context> |
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147 <context>server</context> |
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148 |
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149 <para> |
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150 Specifies the enabled ciphers. |
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151 The ciphers are specified in the format understood by the |
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152 OpenSSL library, for example: |
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153 <example> |
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154 ssl_ciphers ALL:!aNULL:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP; |
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155 </example> |
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156 </para> |
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157 |
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158 <para> |
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159 The full list can be viewed using the |
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160 “<command>openssl ciphers</command>” command. |
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161 </para> |
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162 |
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163 </directive> |
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164 |
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165 |
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166 <directive name="ssl_dhparam"> |
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167 <syntax><value>file</value></syntax> |
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168 <default/> |
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169 <context>stream</context> |
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170 <context>server</context> |
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171 |
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172 <para> |
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173 Specifies a <value>file</value> with DH parameters for DHE ciphers. |
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174 </para> |
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175 |
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176 </directive> |
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177 |
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178 |
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179 <directive name="ssl_ecdh_curve"> |
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180 <syntax><value>curve</value></syntax> |
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181 <default>auto</default> |
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182 <context>stream</context> |
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183 <context>server</context> |
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184 |
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185 <para> |
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186 Specifies a <value>curve</value> for ECDHE ciphers. |
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187 </para> |
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188 |
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189 <para> |
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190 When using OpenSSL 1.0.2 or higher, |
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191 it is possible to specify multiple curves (1.11.0), for example: |
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192 <example> |
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193 ssl_ecdh_curve prime256v1:secp384r1; |
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194 </example> |
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195 </para> |
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196 |
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197 <para> |
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198 The special value <literal>auto</literal> (1.11.0) instructs nginx to use |
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199 a list built into the OpenSSL library when using OpenSSL 1.0.2 or higher, |
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200 or <literal>prime256v1</literal> with older versions. |
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201 </para> |
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202 |
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203 <para> |
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204 <note> |
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205 Prior to version 1.11.0, |
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206 the <literal>prime256v1</literal> curve was used by default. |
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207 </note> |
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208 </para> |
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209 |
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210 </directive> |
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211 |
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212 |
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213 <directive name="ssl_handshake_timeout"> |
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214 <syntax><value>time</value></syntax> |
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215 <default>60s</default> |
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216 <context>stream</context> |
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217 <context>server</context> |
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218 |
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219 <para> |
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220 Specifies a timeout for the SSL handshake to complete. |
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221 </para> |
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222 |
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223 </directive> |
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224 |
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225 |
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226 <directive name="ssl_password_file"> |
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227 <syntax><value>file</value></syntax> |
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228 <default/> |
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229 <context>stream</context> |
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230 <context>server</context> |
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231 |
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232 <para> |
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233 Specifies a <value>file</value> with passphrases for |
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234 <link id="ssl_certificate_key">secret keys</link> |
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235 where each passphrase is specified on a separate line. |
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236 Passphrases are tried in turn when loading the key. |
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237 </para> |
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238 |
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239 <para> |
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240 Example: |
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241 <example> |
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242 stream { |
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243 ssl_password_file /etc/keys/global.pass; |
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244 ... |
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245 |
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246 server { |
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247 listen 127.0.0.1:12345; |
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248 ssl_certificate_key /etc/keys/first.key; |
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249 } |
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250 |
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251 server { |
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252 listen 127.0.0.1:12346; |
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253 |
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254 # named pipe can also be used instead of a file |
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255 ssl_password_file /etc/keys/fifo; |
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256 ssl_certificate_key /etc/keys/second.key; |
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257 } |
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258 } |
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259 </example> |
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260 </para> |
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261 |
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262 </directive> |
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263 |
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264 |
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265 <directive name="ssl_prefer_server_ciphers"> |
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266 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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267 <default>off</default> |
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268 <context>stream</context> |
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269 <context>server</context> |
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270 |
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271 <para> |
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272 Specifies that server ciphers should be preferred over client ciphers |
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273 when the SSLv3 and TLS protocols are used. |
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274 </para> |
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275 |
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276 </directive> |
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277 |
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278 |
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279 <directive name="ssl_protocols"> |
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280 <syntax> |
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281 [<literal>SSLv2</literal>] |
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282 [<literal>SSLv3</literal>] |
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283 [<literal>TLSv1</literal>] |
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284 [<literal>TLSv1.1</literal>] |
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285 [<literal>TLSv1.2</literal>]</syntax> |
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286 <default>TLSv1 TLSv1.1 TLSv1.2</default> |
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287 <context>stream</context> |
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288 <context>server</context> |
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289 |
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290 <para> |
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291 Enables the specified protocols. |
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292 The <literal>TLSv1.1</literal> and <literal>TLSv1.2</literal> parameters work |
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293 only when the OpenSSL library of version 1.0.1 or higher is used. |
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294 </para> |
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295 |
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296 </directive> |
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297 |
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298 |
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299 <directive name="ssl_session_cache"> |
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300 <syntax> |
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301 <literal>off</literal> | |
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302 <literal>none</literal> | |
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303 [<literal>builtin</literal>[:<value>size</value>]] |
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304 [<literal>shared</literal>:<value>name</value>:<value>size</value>]</syntax> |
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305 <default>none</default> |
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306 <context>stream</context> |
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307 <context>server</context> |
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308 |
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309 <para> |
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310 Sets the types and sizes of caches that store session parameters. |
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311 A cache can be of any of the following types: |
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312 <list type="tag"> |
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313 |
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314 <tag-name><literal>off</literal></tag-name> |
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315 <tag-desc> |
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316 the use of a session cache is strictly prohibited: |
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317 nginx explicitly tells a client that sessions may not be reused. |
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318 </tag-desc> |
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319 |
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320 <tag-name><literal>none</literal></tag-name> |
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321 <tag-desc> |
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322 the use of a session cache is gently disallowed: |
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323 nginx tells a client that sessions may be reused, but does not |
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324 actually store session parameters in the cache. |
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325 </tag-desc> |
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326 |
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327 <tag-name><literal>builtin</literal></tag-name> |
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328 <tag-desc> |
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329 a cache built in OpenSSL; used by one worker process only. |
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330 The cache size is specified in sessions. |
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331 If size is not given, it is equal to 20480 sessions. |
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332 Use of the built-in cache can cause memory fragmentation. |
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333 </tag-desc> |
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334 |
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335 <tag-name><literal>shared</literal></tag-name> |
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336 <tag-desc> |
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337 a cache shared between all worker processes. |
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338 The cache size is specified in bytes; one megabyte can store |
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339 about 4000 sessions. |
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340 Each shared cache should have an arbitrary name. |
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341 A cache with the same name can be used in several |
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342 servers. |
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343 </tag-desc> |
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344 |
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345 </list> |
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346 </para> |
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347 |
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348 <para> |
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349 Both cache types can be used simultaneously, for example: |
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350 <example> |
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351 ssl_session_cache builtin:1000 shared:SSL:10m; |
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352 </example> |
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353 but using only shared cache without the built-in cache should |
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354 be more efficient. |
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355 </para> |
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356 |
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357 </directive> |
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358 |
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359 |
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360 <directive name="ssl_session_ticket_key"> |
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361 <syntax><value>file</value></syntax> |
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362 <default/> |
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363 <context>stream</context> |
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364 <context>server</context> |
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365 |
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366 <para> |
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367 Sets a <value>file</value> with the secret key used to encrypt |
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368 and decrypt TLS session tickets. |
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369 The directive is necessary if the same key has to be shared between |
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370 multiple servers. |
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371 By default, a randomly generated key is used. |
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372 </para> |
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373 |
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374 <para> |
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375 If several keys are specified, only the first key is |
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376 used to encrypt TLS session tickets. |
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377 This allows configuring key rotation, for example: |
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378 <example> |
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379 ssl_session_ticket_key current.key; |
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380 ssl_session_ticket_key previous.key; |
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381 </example> |
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382 </para> |
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383 |
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384 <para> |
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385 The <value>file</value> must contain 48 bytes of random data and can |
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386 be created using the following command: |
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387 <example> |
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388 openssl rand 48 > ticket.key |
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389 </example> |
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390 </para> |
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391 |
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392 </directive> |
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393 |
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394 |
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395 <directive name="ssl_session_tickets"> |
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396 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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397 <default>on</default> |
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398 <context>stream</context> |
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399 <context>server</context> |
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400 |
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401 <para> |
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402 Enables or disables session resumption through |
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403 <link url="http://tools.ietf.org/html/rfc5077">TLS session tickets</link>. |
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404 </para> |
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405 |
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406 </directive> |
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407 |
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408 |
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409 <directive name="ssl_session_timeout"> |
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410 <syntax><value>time</value></syntax> |
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411 <default>5m</default> |
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412 <context>stream</context> |
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413 <context>server</context> |
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414 |
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415 <para> |
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416 Specifies a time during which a client may reuse the |
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417 session parameters stored in a cache. |
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418 </para> |
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419 |
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420 </directive> |
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421 |
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422 </section> |
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423 |
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424 |
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425 <section id="variables" name="Embedded Variables"> |
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426 |
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427 <para> |
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428 The <literal>ngx_http_ssl_module</literal> module supports variables |
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429 since 1.11.2. |
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430 <list type="tag"> |
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431 |
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432 <tag-name id="var_ssl_cipher"><var>$ssl_cipher</var></tag-name> |
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433 <tag-desc> |
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434 returns the string of ciphers used |
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435 for an established SSL connection; |
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436 </tag-desc> |
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437 |
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438 <tag-name id="var_ssl_protocol"><var>$ssl_protocol</var></tag-name> |
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439 <tag-desc> |
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440 returns the protocol of an established SSL connection; |
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441 </tag-desc> |
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442 |
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443 <tag-name id="var_ssl_server_name"><var>$ssl_server_name</var></tag-name> |
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444 <tag-desc> |
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445 returns the server name requested through |
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446 <link url="http://en.wikipedia.org/wiki/Server_Name_Indication">SNI</link>; |
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447 </tag-desc> |
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448 |
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449 <tag-name id="var_ssl_session_id"><var>$ssl_session_id</var></tag-name> |
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450 <tag-desc> |
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451 returns the session identifier of an established SSL connection; |
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452 </tag-desc> |
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453 |
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454 <tag-name id="var_ssl_session_reused"><var>$ssl_session_reused</var></tag-name> |
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455 <tag-desc> |
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456 returns “<literal>r</literal>” if an SSL session was reused, |
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457 or “<literal>.</literal>” otherwise. |
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458 </tag-desc> |
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459 |
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460 </list> |
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461 </para> |
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462 |
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463 </section> |
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464 |
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465 </module> |