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annotate xml/en/docs/mail/ngx_mail_auth_http_module.xml @ 1065:88c0d96b9825

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Documented the smtp_auth "none" method. Provided with exemplary auth request.
author Sergey Kandaurov <pluknet@nginx.com>
date Sat, 08 Feb 2014 17:42:40 +0400
parents 3ee0ba5f4f08
children de77e295c073
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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) 2006, 2007 Anton Yuzhaninov
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5 Copyright (C) Nginx, Inc.
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6 -->
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7
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8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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9
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10 <module name="Module ngx_mail_auth_http_module"
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11 link="/en/docs/mail/ngx_mail_auth_http_module.html"
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12 lang="en"
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13 rev="1">
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14
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15 <section id="directives" name="Directives">
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16
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17 <directive name="auth_http">
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18 <syntax><value>URL</value></syntax>
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19 <default/>
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20 <context>mail</context>
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21 <context>server</context>
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22
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23 <para>
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24 Sets the URL of the HTTP authentication server.
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25 The protocol is described below.
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26 </para>
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27
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28 </directive>
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29
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30
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31 <directive name="auth_http_header">
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32 <syntax><value>header</value> <value>value</value></syntax>
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33 <default/>
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34 <context>mail</context>
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35 <context>server</context>
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36
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37 <para>
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38 Appends the specified header to requests to the authentication server.
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39 This header can be used as the shared secret to verify
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40 that the request comes from nginx.
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41 For example:
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42 <example>
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43 auth_http_header X-Auth-Key "secret_string";
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44 </example>
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45 </para>
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46
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47 </directive>
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48
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49
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50 <directive name="auth_http_timeout">
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51 <syntax><value>time</value></syntax>
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52 <default>60s</default>
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53 <context>mail</context>
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54 <context>server</context>
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55
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56 <para>
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57 </para>
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58
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59 </directive>
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60
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61 </section>
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62
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63
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64 <section id="protocol" name="Protocol">
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65
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66 <para>
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67 The HTTP is used to communicate with the authentication server.
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68 The data in the response body is ignored, and the information is passed only in
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69 the headers.
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70 </para>
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71
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72 <para>
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73 Examples of requests and responses:
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74 </para>
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75
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76 <para>
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77 Request:
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78 <example>
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79 GET /auth HTTP/1.0
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80 Host: localhost
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81 Auth-Method: plain # plain/apop/cram-md5
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82 Auth-User: user
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83 Auth-Pass: password
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84 Auth-Protocol: imap # imap/pop3/smtp
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85 Auth-Login-Attempt: 1
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86 Client-IP: 192.0.2.42
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87 Client-Host: client.example.org
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88 </example>
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89 Good response:
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90 <example>
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91 HTTP/1.0 200 OK
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92 Auth-Status: OK
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93 Auth-Server: 198.51.100.1
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94 Auth-Port: 143
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95 </example>
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96 Bad response:
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97 <example>
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98 HTTP/1.0 200 OK
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99 Auth-Status: Invalid login or password
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100 Auth-Wait: 3
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101 </example>
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102 </para>
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103
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104 <para>
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105 If there is no <header>Auth-Wait</header> header,
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106 an error will be returned and the connection will be closed.
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107 The current implementation allocates memory for each authentication attempt.
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108 The memory is freed only at the end of a session.
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109 Therefore, the number of invalid authentication attempts in a single session
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110 must be limited — the server must respond without
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111 the <header>Auth-Wait</header> header after 10-20 attempts
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112 (the attempt number is passed in the <header>Auth-Login-Attempt</header>
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113 header).
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114 </para>
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115
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116 <para>
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117 When the APOP or CRAM-MD5 are used, a request-response will look as follows.
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118 <example>
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119 GET /auth HTTP/1.0
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120 Host: localhost
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121 Auth-Method: apop
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122 Auth-User: user
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123 Auth-Salt: &lt;238188073.1163692009@mail.example.com&gt;
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124 Auth-Pass: auth_response
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125 Auth-Protocol: imap
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126 Auth-Login-Attempt: 1
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127 Client-IP: 192.0.2.42
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128 Client-Host: client.example.org
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129 </example>
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130 Good response:
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131 <example>
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132 HTTP/1.0 200 OK
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133 Auth-Status: OK
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134 Auth-Server: 198.51.100.1
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135 Auth-Port: 143
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136 Auth-Pass: plain-text-pass
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137 </example>
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138 </para>
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139
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140 <para>
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141 For the SMTP, the response additionally takes into account
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142 the <header>Auth-Error-Code</header> header — if exists, it is used
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143 as a response code in case of an error.
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144 Otherwise, the 535 5.7.0 code will be added to
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145 the <header>Auth-Status</header>.
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146 </para>
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147
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148 <para>
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149 For example, if the following response is received
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150 from the authentication server:
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151 <example>
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152 HTTP/1.0 200 OK
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153 Auth-Status: Temporary server problem, try again later
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154 Auth-Error-Code: 451 4.3.0
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155 Auth-Wait: 3
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156 </example>
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157 then the SMTP client will receive an error
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158 <example>
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159 451 4.3.0 Temporary server problem, try again later
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160 </example>
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161 </para>
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162
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163 <para>
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164 If proxying SMTP does not require authentication,
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165 a request will look as follows.
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166 <example>
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167 GET /auth HTTP/1.0
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168 Host: localhost
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169 Auth-Method: none
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170 Auth-User:
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171 Auth-Pass:
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172 Auth-Protocol: smtp
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173 Auth-Login-Attempt: 1
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174 Client-IP: 192.0.2.42
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175 Client-Host: client.example.org
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176 Auth-SMTP-Helo: client.example.org
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177 Auth-SMTP-From: MAIL FROM: &lt;&gt;
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178 Auth-SMTP-To: RCPT TO: &lt;postmaster@mail.example.com&gt;
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179 </example>
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180 </para>
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181
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182 </section>
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183
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184 </module>