annotate mod_firewall/README.markdown @ 2092:f5d78bc016a6

mod_firewall: README: Add warning about COPY action's ability to cause loops (thanks Ge0rG)
author Matthew Wild <mwild1@gmail.com>
date Wed, 16 Mar 2016 11:46:20 +0000
parents 2ec7c0b8a371
children 7b9520479e99
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1 ---
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2 labels:
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3 - 'Stage-Alpha'
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4 summary: 'A rule-based stanza filtering module'
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5 ...
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6
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7 ------------------------------------------------------------------------
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8
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9 **Note:** mod\_firewall is in its very early stages. This documentation
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10 is liable to change, and some described functionality may be missing,
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11 incomplete or contain bugs. Feedback is welcome in the comments section
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12 at the bottom of this page.
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14 ------------------------------------------------------------------------
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15
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16 Introduction
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17 ============
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18
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19 A firewall is an invaluable tool in the sysadmin's toolbox. However
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20 while low-level firewalls such as iptables and pf are incredibly good at
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21 what they do, they are generally not able to handle application-layer
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22 rules.
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23
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24 The goal of mod\_firewall is to provide similar services at the XMPP
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25 layer. Based on rule scripts it can efficiently block, bounce, drop,
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26 forward, copy, redirect stanzas and more! Furthermore all rules can be
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27 applied and updated dynamically at runtime without restarting the
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28 server.
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29
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30 Details
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31 =======
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32
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33 mod\_firewall loads one or more scripts, and compiles these to Lua code
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34 that reacts to stanzas flowing through Prosody. The firewall script
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35 syntax is unusual, but straightforward.
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36
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37 A firewall script is dominated by rules. Each rule has two parts:
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38 conditions, and actions. When a stanza matches all of the conditions,
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39 all of the actions are executed in order.
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40
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41 Here is a simple example to block stanzas from spammer@example.com:
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42
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43 FROM: spammer@example.com
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44 DROP.
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45
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46 FROM is a condition, and DROP is an action. This is about as simple as
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47 it gets. How about heading to the other extreme? Let's demonstrate
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48 something more complex that mod\_firewall can do for you:
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49
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50 %ZONE myorganisation: staff.myorg.example, support.myorg.example
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51
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52 ENTERING: myorganisation
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53 KIND: message
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54 TIME: 12am-9am, 5pm-12am, Saturday, Sunday
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55 REPLY=Sorry, I am afraid our office is closed at the moment. If you need assistance, please call our 24-hour support line on 123-456-789.
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56
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57 This rule will reply with a short message whenever someone tries to send
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58 a message to someone at any of the hosts defined in the 'myorganisation'
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59 outside of office hours.
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60
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61 Firewall rules should be written to a `ruleset.pfw` file. Multiple such
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62 rule files can be specified in the configuration using:
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64 firewall_scripts = { "path/to/ruleset.pfw" }
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65
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66 Conditions
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67 ----------
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68
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69 All conditions must come before any action in a rule block. The
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70 condition name is followed by a colon (':'), and the value to test for.
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71
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72 A condition can be preceded or followed by `NOT` to negate its match.
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73 For example:
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74
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75 NOT FROM: user@example.com
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76 KIND NOT: message
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77
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78 ### Zones
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79
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80 A 'zone' is one or more hosts or JIDs. It is possible to match when a
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81 stanza is entering or leaving a zone, while at the same time not
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82 matching traffic passing between JIDs in the same zone.
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83
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84 Zones are defined at the top of a script with the following syntax (they
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85 are not part of a rule block):
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86
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87 %ZONE myzone: host1, host2, user@host3, foo.bar.example
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88
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89 A host listed in a zone also matches all users on that host (but not
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90 subdomains).
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91
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92 The following zone-matching conditions are supported:
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93
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94 Condition Matches
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95 ------------ ------------------------------------------
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96 `ENTERING` When a stanza is entering the named zone
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97 `LEAVING` When a stanza is leaving the named zone
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98
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99 ### Stanza matching
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100
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101 Condition Matches
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102 ----------- ------------------------------------------------------------------------------------------------------------------------------------------------------------
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103 `KIND` The kind of stanza. May be 'message', 'presence' or 'iq'
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104 `TYPE` The type of stanza. This varies depending on the kind of stanza. See 'Stanza types' below for more information.
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105 `PAYLOAD` The stanza contains a child with the given namespace. Useful for determining the type of an iq request, or whether a message contains a certain extension.
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106 `INSPECT` The node at the specified path exists or matches a given string. This allows you to look anywhere inside a stanza. See below for examples and more.
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107
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108 #### Stanza types
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109
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110 Stanza Valid types
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111 ---------- ------------------------------------------------------------------------------------------
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112 iq get, set, result, error
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113 presence *available*, unavailable, probe, subscribe, subscribed, unsubscribe, unsubscribed, error
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114 message normal, chat, groupchat, headline, error
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115
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116 **Note:** The type 'available' for presence does not actually appear in
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117 the protocol. Available presence is signalled by the omission of a type.
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118 Similarly, a message stanza with no type is equivalent to one of type
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119 'normal'. mod\_firewall handles these cases for you automatically.
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120
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121 #### INSPECT
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122
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123 INSPECT takes a 'path' through the stanza to get a string (an attribute
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124 value or text content). An example is the best way to explain. Let's
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125 check that a user is not trying to register an account with the username
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126 'admin'. This stanza comes from [XEP-0077: In-band
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127 Registration](http://xmpp.org/extensions/xep-0077.html#example-4):
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128
2002
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129 ``` xml
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130 <iq type='set' id='reg2'>
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131 <query xmlns='jabber:iq:register'>
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132 <username>bill</username>
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133 <password>Calliope</password>
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134 <email>bard@shakespeare.lit</email>
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135 </query>
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136 </iq>
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137 ```
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138
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139 KIND: iq
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140 TYPE: set
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141 PAYLOAD: jabber:iq:register
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142 INSPECT: {jabber:iq:register}query/username#=admin
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143 BOUNCE=not-allowed The username 'admin' is reserved.
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144
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145 That weird string deserves some explanation. It is a path, divided into
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146 segments by '/'. Each segment describes an element by its name,
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147 optionally prefixed by its namespace in curly braces ('{...}'). If the
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148 path ends with a '\#' then the text content of the last element will be
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149 returned. If the path ends with '@name' then the value of the attribute
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150 'name' will be returned.
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151
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152 INSPECT is somewhat slower than the other stanza matching conditions. To
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153 minimise performance impact, always place it below other faster
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154 condition checks where possible (e.g. above we first checked KIND, TYPE
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155 and PAYLOAD matched before INSPECT).
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156
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157 ### Sender/recipient matching
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158
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159 Condition Matches
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160 ----------- -------------------------------------------------------
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161 `FROM` The JID in the 'from' attribute matches the given JID
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162 `TO` The JID in the 'to' attribute matches the given JID
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163
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164 These conditions both accept wildcards in the JID when the wildcard
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165 expression is enclosed in angle brackets ('\<...\>'). For example:
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166
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167 # All users at example.com
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168 FROM: <*>@example.com
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169
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170 # The user 'admin' on any subdomain of example.com
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171 FROM: admin@<*.example.com>
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172
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173 You can also use [Lua's pattern
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174 matching](http://www.lua.org/manual/5.1/manual.html#5.4.1) for more
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175 powerful matching abilities. Patterns are a lightweight
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176 regular-expression alternative. Simply contain the pattern in double
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177 angle brackets. The pattern is automatically anchored at the start and
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178 end (so it must match the entire portion of the JID).
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179
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180 # Match admin@example.com, and admin1@example.com, etc.
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181 FROM: <<admin%d*>>@example.com
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182
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183 **Note:** It is important to know that 'example.com' is a valid JID on
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184 its own, and does **not** match 'user@example.com'. To perform domain
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185 whitelists or blacklists, use Zones.
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186
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187 Condition Matches
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188 ---------------- ---------------------------------------------------------------
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189 `FROM_EXACTLY` The JID in the 'from' attribute exactly matches the given JID
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190 `TO_EXACTLY` The JID in the 'to' attribute exactly matches the given JID
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191
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192 These additional conditions do not support pattern matching, but are
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193 useful to match the exact to/from address on a stanza. For example, if
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194 no resource is specified then only bare JIDs will be matched. TO and FROM
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195 match all resources if no resource is specified to match.
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196
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197 **Note:** Some chains execute before Prosody has performed any
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198 normalisation or validity checks on the to/from JIDs on an incoming
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199 stanza. It is not advisable to perform access control or similar rules
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200 on JIDs in these chains (see the chain documentation for more info).
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201
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202 ### Time and date
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203
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204 #### TIME
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205
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206 Matches stanzas sent during certain time periods.
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207
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208 Condition Matches
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209 ----------- -------------------------------------------------------------------------------------------
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210 TIME When the current server local time is within one of the comma-separated time ranges given
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211
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212 TIME: 10pm-6am, 14:00-15:00
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213 REPLY=Zzzz.
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214
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215 #### DAY
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216
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217 It is also possible to match only on certain days of the week.
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218
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219 Condition Matches
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220 ----------- -----------------------------------------------------------------------------------------------------
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221 DAY When the current day matches one, or falls within a rage, in the given comma-separated list of days
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222
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223 Example:
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224
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225 DAY: Sat-Sun, Wednesday
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226 REPLY=Sorry, I'm out enjoying life!
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227
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228 ### Rate-limiting
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229
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230 It is possible to selectively rate-limit stanzas, and use rules to
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231 decide what to do with stanzas when over the limit.
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232
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233 First, you must define any rate limits that you are going to use in your
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234 script. Here we create a limiter called 'normal' that will allow 2
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235 stanzas per second, and then we define a rule to bounce messages when
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236 over this limit. Note that the `RATE` definition is not part of a rule
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237 (multiple rules can share the same limiter).
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238
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239 %RATE normal: 2 (burst 3)
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240
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241 KIND: message
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242 LIMIT: normal
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243 BOUNCE=policy-violation (Sending too fast!)
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244
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245 The 'burst' parameter on the rate limit allows you to spread the limit
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246 check over a given time period. For example the definition shown above
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247 will allow the limit to be temporarily surpassed, as long as it is
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248 within the limit after 3 seconds. You will almost always want to specify
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249 a burst factor.
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250
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251 Both the rate and the burst can be fractional values. For example a rate
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252 of 0.1 means only one event is allowed every 10 seconds.
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253
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254 The LIMIT condition actually does two things; first it counts against
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255 the given limiter, and then it checks to see if the limiter over its
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256 limit yet. If it is, the condition matches, otherwise it will not.
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257
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258 Condition Matches
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259 ----------- --------------------------------------------------------------------------------------------------
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260 `LIMIT` When the named limit is 'used up'. Using this condition automatically counts against that limit.
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261
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262 **Note:** Reloading mod\_firewall resets the current state of any
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263 limiters.
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264
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265 Actions
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266 -------
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267
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268 Actions come after all conditions in a rule block. There must be at
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269 least one action, though conditions are optional.
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270
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271 An action without parameters ends with a full-stop/period ('.'), and one
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272 with parameters uses an equals sign ('='):
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273
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274 # An action with no parameters:
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275 DROP.
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276
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277 # An action with a parameter:
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278 REPLY=Hello, this is a reply.
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279
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280 ### Route modification
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281
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282 The most common actions modify the stanza's route in some way. Currently
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283 the first matching rule to do so will halt further processing of actions
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284 and rules (this may change in the future).
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285
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286 Action Description
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287 ----------------------- ---------------------------------------------------------------------------------------------------------------------------------------------------------
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288 `PASS.` Stop executing actions and rules on this stanza, and let it through this chain.
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289 `DROP.` Stop executing actions and rules on this stanza, and discard it.
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290 `REDIRECT=jid` Redirect the stanza to the given JID.
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291 `REPLY=text` Reply to the stanza (assumed to be a message) with the given text.
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292 `BOUNCE.` Bounce the stanza with the default error (usually service-unavailable)
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293 `BOUNCE=error` Bounce the stanza with the given error (MUST be a defined XMPP stanza error, see [RFC6120](http://xmpp.org/rfcs/rfc6120.html#stanzas-error-conditions).
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294 `BOUNCE=error (text)` As above, but include the supplied human-readable text with a description of the error
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295 `COPY=jid` Make a copy of the stanza and send the copy to the specified JID. The copied stanza flows through Prosody's routing code, and as such is affected by firewall rules. Be careful to avoid loops.
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296
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297 ### Stanza modification
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298
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299 These actions make it possible to modify the content and structure of a
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300 stanza.
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301
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302 Action Description
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303 ------------------------ ------------------------------------------------------------------------
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304 `STRIP=name` Remove any child elements with the given name in the default namespace
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305 `STRIP=name namespace` Remove any child elements with the given name and the given namespace
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306 `INJECT=xml` Inject the given XML into the stanza as a child element
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307
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308 ### Informational
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309
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310 Action Description
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311 --------------- ------------------------------------------------------------------------------------------------------------------------
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312 `LOG=message` Logs the given message to Prosody's log file. Optionally prefix it with a log level in square brackets, e.g. `[debug]`