annotate mod_firewall/README.markdown @ 5529:a8f49bf7f8e6

mod_firewall: README: Add some emphasis on the exact behaviour of TO FULL JID
author Matthew Wild <mwild1@gmail.com>
date Thu, 08 Jun 2023 11:25:40 +0100
parents e8f46195b292
children 8226ac08484e
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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 rockspec:
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6 build:
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7 modules:
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8 mod_firewall.actions: actions.lib.lua
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9 mod_firewall.conditions: conditions.lib.lua
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10 mod_firewall.definitions: definitions.lib.lua
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11 mod_firewall.marks: marks.lib.lua
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12 mod_firewall.test: test.lib.lua
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13 copy_directories:
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14 - scripts
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15 ---
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17 ------------------------------------------------------------------------
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18
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19 **Note:** mod\_firewall is in its very early stages. This documentation
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20 is liable to change, and some described functionality may be missing,
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21 incomplete or contain bugs.
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23 ------------------------------------------------------------------------
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24
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25 Introduction
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26 ============
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27
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28 A firewall is an invaluable tool in the sysadmin's toolbox. However
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29 while low-level firewalls such as iptables and pf are incredibly good at
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30 what they do, they are generally not able to handle application-layer
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31 rules.
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32
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33 The goal of mod\_firewall is to provide similar services at the XMPP
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34 layer. Based on rule scripts it can efficiently block, bounce, drop,
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35 forward, copy, redirect stanzas and more! Furthermore all rules can be
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36 applied and updated dynamically at runtime without restarting the
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37 server.
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38
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39 Details
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40 =======
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41
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42 mod\_firewall loads one or more scripts, and compiles these to Lua code
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43 that reacts to stanzas flowing through Prosody. The firewall script
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44 syntax is unusual, but straightforward.
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45
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46 A firewall script is dominated by rules. Each rule has two parts:
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47 conditions, and actions. When a stanza matches all of the conditions,
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48 all of the actions are executed in order.
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49
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50 Here is a simple example to block stanzas from spammer@example.com:
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51
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52 FROM: spammer@example.com
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53 DROP.
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54
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55 FROM is a condition, and DROP is an action. This is about as simple as
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56 it gets. How about heading to the other extreme? Let's demonstrate
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57 something more complex that mod\_firewall can do for you:
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58
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59 %ZONE myorganisation: staff.myorg.example, support.myorg.example
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60
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61 ENTERING: myorganisation
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62 KIND: message
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63 TIME: 12am-9am, 5pm-12am, Saturday, Sunday
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64 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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65
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66 This rule will reply with a short message whenever someone tries to send
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67 a message to someone at any of the hosts defined in the 'myorganisation'
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68 outside of office hours.
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69
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70 Specifying rule sets
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71 --------------------
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72
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73 Firewall rules should be written into text files, e.g. `ruleset.pfw` file.
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74 One or more rule files can be specified in the configuration using:
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75
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76 firewall_scripts = { "path/to/ruleset.pfw", "path/to/ruleset2.pfw" }
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77
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78 If multiple files are specified and they both add rules to the same [chains](#chains),
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79 each file's rules will be processed in order, but the order of files is undefined.
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80
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81 Reloading Prosody's configuration also reloads firewall rules.
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82
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83 Make sure that `firewall_scripts` is in the global section of the configuration file
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84 and not below a virtual host or a component - unless you want per-vhost
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85 firewall rules.
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86
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87 Conditions
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88 ----------
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89
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90 All conditions must come before any action in a rule block. The
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91 condition name is followed by a colon (':'), and the value to test for.
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92
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93 A condition can be preceded or followed by `NOT` to negate its match.
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94 For example:
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96 NOT FROM: user@example.com
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97 KIND NOT: message
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98
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99 Some conditions do not take parameters, and these should end with just a
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100 question mark, like:
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101
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102 IN ROSTER?
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103
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104 ### Zones
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105
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106 A 'zone' is one or more hosts or JIDs. It is possible to match when a
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107 stanza is entering or leaving a zone, while at the same time not
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108 matching traffic passing between JIDs in the same zone.
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109
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110 Zones are defined at the top of a script with the following syntax (they
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111 are not part of a rule block):
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112
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113 %ZONE myzone: host1, host2, user@host3, foo.bar.example
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114
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115 There is an automatic zone named `$local`, which automatically includes
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116 all of the current server's active hosts (including components). It can
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117 be used to match stanzas entering or leaving the current server.
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118
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119 A host listed in a zone also matches all users on that host (but not
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120 subdomains).
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121
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122 The following zone-matching conditions are supported:
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123
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124 Condition Matches
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125 ------------ ------------------------------------------
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126 `ENTERING` When a stanza is entering the named zone
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127 `LEAVING` When a stanza is leaving the named zone
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128
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129 ### Lists
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130
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131 It is possible to create or load lists of strings for use in scripts. For
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132 example, you might load a list of blocked JIDs, malware URLs or simple words
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133 that you want to filter messages on.
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134
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135 List type Example
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136 ----------- -----------------------
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137 memory %LIST spammers: memory
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138 file %LIST spammers: file:/etc/spammers.txt
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139 http %LIST spammers: http://example.com/spammers.txt
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140
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141 #### List types
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142 ##### memory
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143
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144 ```
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145 %LIST name: memory (limit: number)
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146 ```
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147
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148 A memory-only list, with an optional limit. Supports addition and removal of items by scripts.
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149
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150 If a limit is provided, the oldest item will be discarded to make room for a new item if the
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151 list is full. The limit is useful to prevent infinite memory growth on busy servers.
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152
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153 ##### file
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154
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155 ```
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156 %LIST name: file:/path/to/file (missing: string)
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157 ```
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158
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159 Reads a list from a file. The list can be added to and removed from by scripts, but
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160 these changes do not persist between restarts.
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161
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162 If the file is missing, an error will be raised. The optional 'missing' parameter can be set
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163 to 'ignore' (e.g. `(missing: ignore)`) to ignore a missing file.
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164
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165 ##### http
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166
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167 ```
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168 %LIST name: http://example.com/ (ttl: number, pattern: pat, hash: sha1, checkcerts: when-sni)
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169 ```
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170
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171 Fetches a list from a HTTP or HTTPS URL. The following options are accepted:
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172
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173 Option Description
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174 ------- -----------
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175 ttl Seconds to cache the list for. After expiry, it will be refetched. Default 3600 (1 hour).
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176 pattern Optional pattern used to extract list entries from the response. Default is to treat each line as a single item.
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177 hash Optional hash to be applied to items before looking them up in the list, e.g. sha1 or sha256.
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178 checkcert Whether to verify HTTPS certificates. May be "always", "never" or "when-sni". Default "when-sni".
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179
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180 The "when-sni" default disables certificate verification when Prosody's HTTP client API doesn't support SNI,
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181 as in Prosody 0.11.6 and earlier.
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182
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183 #### CHECK LIST
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184
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185 Checks whether a simple [expression](#expressions) is found in a given list.
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186
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187 Example:
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188
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189 %LIST blocked_jids: file:/etc/prosody/blocked_jids.txt
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190
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191 # Rule to block presence subscription requests from blocked JIDs
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192 KIND: presence
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193 TYPE: subscribe
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194 CHECK LIST: blocked_jids contains $<@from>
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195 BOUNCE=policy-violation (Your JID is blocked)
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196
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197 #### SCAN
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198
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199 SCAN allows you to search inside a stanza for a given pattern, and check each result against a list. For example,
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200 you could scan a message body for words and check if any of the words are found in a given list.
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201
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202 Before using SCAN, you need to define a search location and a pattern. The search location uses the same 'path'
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203 format as documented under the 'INSPECT' condition. Patterns can be any valid Lua pattern.
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204
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205 To use the above example:
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206
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207 # Define a search location called 'body' which fetches the text of the 'body' element
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208 %SEARCH body: body#
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209 # Define a pattern called 'word' which matches any sequence of letters
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210 %PATTERN word: [A-Za-z]+
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211 # Finally, we also need our list of "bad" words:
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212 %LIST badwords: file:/etc/prosody/bad_words.txt
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213
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214 # Now we can use these to SCAN incoming stanzas
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215 # If it finds a match, bounce the stanza
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216 SCAN: body for word in badwords
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217 BOUNCE=policy-violation (This word is not allowed!)
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218
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219 #### COUNT
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220
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221 COUNT is similar to SCAN, in that it uses a defined SEARCH and breaks it up according to a PATTERN. Then it
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222 counts the number of results.
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223
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224 For example, to block every message with more than one URL:
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225
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226 # Define a search location called 'body' which fetches the text of the 'body' element
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227 %SEARCH body: body#
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228 # Define a pattern called 'url' which matches HTTP links
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229 %PATTERN url: https?://%S+
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230
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231 COUNT: url in body > 1
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232 BOUNCE=policy-violation (Up to one HTTP URL is allowed in messages)
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233
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234 ### Stanza matching
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235
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236 Condition Matches
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237 ----------- ------------------------------------------------------------------------------------------------------------------------------------------------------------
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238 `KIND` The kind of stanza. May be 'message', 'presence' or 'iq'
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239 `TYPE` The type of stanza. This varies depending on the kind of stanza. See 'Stanza types' below for more information.
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240 `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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241 `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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242
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243 #### Stanza types
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244
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245 Stanza Valid types
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246 ---------- ------------------------------------------------------------------------------------------
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247 iq get, set, result, error
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248 presence *available*, unavailable, probe, subscribe, subscribed, unsubscribe, unsubscribed, error
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249 message normal, chat, groupchat, headline, error
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250
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251 **Note:** The type 'available' for presence does not actually appear in
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252 the protocol. Available presence is signalled by the omission of a type.
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253 Similarly, a message stanza with no type is equivalent to one of type
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254 'normal'. mod\_firewall handles these cases for you automatically.
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255
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256 ### Sender/recipient matching
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257
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258 Condition Matches
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259 ------------- -------------------------------------------------------
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260 `FROM` The JID in the 'from' attribute matches the given JID.
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261 `TO` The JID in the 'to' attribute matches the given JID.
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262 `TO SELF` The stanza is sent by any of a user's resources to their own bare JID.
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263 `TO FULL JID` The stanza is addressed to a **valid** full JID on the local server (full JIDs include a resource at the end, and only exist for the lifetime of a single session, therefore the recipient **must be online**, or this check will not match).
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264
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265 The TO and FROM conditions both accept wildcards in the JID when it is
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266 enclosed in angle brackets ('\<...\>'). For example:
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267
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268 # All users at example.com
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269 FROM: <*>@example.com
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270
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271 # The user 'admin' on any subdomain of example.com
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272 FROM: admin@<*.example.com>
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273
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274 You can also use [Lua's pattern
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275 matching](http://www.lua.org/manual/5.1/manual.html#5.4.1) for more
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276 powerful matching abilities. Patterns are a lightweight
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277 regular-expression alternative. Simply contain the pattern in double
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278 angle brackets. The pattern is automatically anchored at the start and
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279 end (so it must match the entire portion of the JID).
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280
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281 # Match admin@example.com, and admin1@example.com, etc.
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282 FROM: <<admin%d*>>@example.com
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283
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284 **Note:** It is important to know that 'example.com' is a valid JID on
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285 its own, and does **not** match 'user@example.com'. To efficiently match
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286 domains we recommend defining them as [Zones](#zones).
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287
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288 Condition Matches
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289 ---------------- ---------------------------------------------------------------
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290 `FROM_EXACTLY` The JID in the 'from' attribute exactly matches the given JID
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291 `TO_EXACTLY` The JID in the 'to' attribute exactly matches the given JID
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292
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293 These additional conditions do not support pattern matching, but are
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294 useful to match the exact to/from address on a stanza. For example, if
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295 no resource is specified then only bare JIDs will be matched. TO and FROM
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296 match all resources if no resource is specified to match.
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297
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298 **Note:** Some chains execute before Prosody has performed any
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299 normalisation or validity checks on the to/from JIDs on an incoming
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300 stanza. It is not advisable to perform access control or similar rules
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301 on JIDs in these chains (see the [chain documentation](#chains) for more info).
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302
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303 #### INSPECT
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304
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305 INSPECT takes a 'path' through the stanza to get a string (an attribute
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306 value or text content). An example is the best way to explain. Let's
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307 check that a user is not trying to register an account with the username
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308 'admin'. This stanza comes from [XEP-0077: In-band
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309 Registration](http://xmpp.org/extensions/xep-0077.html#example-4):
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310
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311 ``` xml
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312 <iq type='set' id='reg2'>
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313 <query xmlns='jabber:iq:register'>
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314 <username>bill</username>
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315 <password>Calliope</password>
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316 <email>bard@shakespeare.lit</email>
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317 </query>
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318 </iq>
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319 ```
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320
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321 KIND: iq
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322 TYPE: set
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323 PAYLOAD: jabber:iq:register
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324 INSPECT: {jabber:iq:register}query/username#=admin
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325 BOUNCE=not-allowed (The username 'admin' is reserved.)
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326
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327 That weird string deserves some explanation. It is a path, divided into
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328 segments by '/'. Each segment describes an element by its name,
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329 optionally prefixed by its namespace in curly braces ('{...}'). If the
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330 path ends with a '\#' then the text content of the last element will be
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331 returned. If the path ends with '@name' then the value of the attribute
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332 'name' will be returned.
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333
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334 You can use INSPECT to test for the existence of an element or attribute,
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335 or you can check if it matches a specific value, e.g. by appending `=VALUE`
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336 (like in the example above, that checks if the content of username is 'admin').
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337
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338 #### INSPECT comparison operators
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339
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340 As well as checking for an exact string match, there are some other modifiers
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341 you can apply to the comparison:
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342
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343 Comparison Matches when
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344 ------------- -------------------------------------------------------
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345 `=` The value is exactly the given string.
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346 `/=` The value is or *contains* the given string (e.g. `/=admin` would match `administrator` or `myadmin`).
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347 `~=` The value matches the given [Lua pattern](https://www.lua.org/manual/5.2/manual.html#6.4.1).
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348
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349 Finally, if the comparison operator is preceded by a `$` character, [expressions](#expressions)
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350 will be interpreted in the string following the comparison operator.
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351
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352 e.g. `INSPECT: {jabber:iq:register}query/username}$/=$(session.host)` would match
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353 if the username of an account registration contained the session's current hostname
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354 somewhere in it.
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355
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356 #### INSPECT performance
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357
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358 INSPECT can be somewhat slower than the other stanza matching conditions. To
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359 minimise performance impact, always place it below other faster
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360 condition checks where possible (e.g. in the example above we first checked KIND,
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361 TYPE and PAYLOAD matched what we wanted before reaching the INSPECT rule).
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362
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363 ### Roster
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364
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365 These conditions access the roster of the recipient (only). Therefore they cannot (currently)
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366 be used in some [chains](#chains), such as for outgoing messages (the recipient may be on another server).
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367
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368 Performance note: these checks can potentially cause storage access (especially if the recipient
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369 is currently offline), so you may want to limit their use in high-traffic situations, and place rules
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370 containing a roster check below other rules (such as a rate limiter). The storage access is
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371 performed unconditionally just before evaluation of the first rule that contains a roster-based
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372 condition, even if earlier conditions in that rule do not match.
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373
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374 #### IN ROSTER
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375
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376 Tests whether the sender is in the recipient's roster.
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377
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378 IN ROSTER?
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379
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380 #### IN ROSTER GROUP
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381
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382 Tests whether the sender is in the recipient's roster, and in the named group.
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383
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384 IN ROSTER GROUP: Friends
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385
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386 #### SUBSCRIBED
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387
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388 Tests whether the recipient is subscribed to the sender, ie will receive
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389 presence updates from them.
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390
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391 Note that this *does* work, regardless of direction and which [chain](#chain) is
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392 used, since both the sender and the recipient will have mirrored roster
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393 entries.
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394
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395 ### Groups
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396
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397 Using Prosody's mod\_groups it is possible to define groups of users on the server. You can
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398 match based on these groups in firewall rules.
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399
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400 Condition Matches
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401 ----------------- ----------------------------
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402 `FROM GROUP` When the stanza is being sent from a member of the named group
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403 `TO GROUP` When the stanza is being sent to a member of the named group
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404 `CROSSING GROUPS` When the stanza is being sent between users of different named groups
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405
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406 #### CROSSING GROUPS
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407
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408 The `CROSSING GROUPS` condition takes a comma-separated list of groups to check. If the
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409 sender and recipient are not in the same group (only the listed groups are checked), then the
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410 this condition matches and the stanza is deemed to be crossing between groups.
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411
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412 For example, if you had three groups: Engineering, Marketing and Employees. All users are
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413 members of the 'Employees' group, and the others are for employees of the named department only.
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414
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Matthew Wild <mwild1@gmail.com>
parents: 2576
diff changeset
415 To prevent employees in the marketing department from communicating with engineers, you could use
1e1c929c1aa5 mod_firewall: Add and document CROSSING GROUPS condition
Matthew Wild <mwild1@gmail.com>
parents: 2576
diff changeset
416 the following rule:
1e1c929c1aa5 mod_firewall: Add and document CROSSING GROUPS condition
Matthew Wild <mwild1@gmail.com>
parents: 2576
diff changeset
417
1e1c929c1aa5 mod_firewall: Add and document CROSSING GROUPS condition
Matthew Wild <mwild1@gmail.com>
parents: 2576
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418 ```
1e1c929c1aa5 mod_firewall: Add and document CROSSING GROUPS condition
Matthew Wild <mwild1@gmail.com>
parents: 2576
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419 CROSSING GROUPS: Marketing, Engineering
1e1c929c1aa5 mod_firewall: Add and document CROSSING GROUPS condition
Matthew Wild <mwild1@gmail.com>
parents: 2576
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420 BOUNCE=policy-violation (no communication between these groups is allowed!)
1e1c929c1aa5 mod_firewall: Add and document CROSSING GROUPS condition
Matthew Wild <mwild1@gmail.com>
parents: 2576
diff changeset
421 ```
1e1c929c1aa5 mod_firewall: Add and document CROSSING GROUPS condition
Matthew Wild <mwild1@gmail.com>
parents: 2576
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422
1e1c929c1aa5 mod_firewall: Add and document CROSSING GROUPS condition
Matthew Wild <mwild1@gmail.com>
parents: 2576
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423 This works, even though both the users are in the 'Employees' group, because that group is not listed
1e1c929c1aa5 mod_firewall: Add and document CROSSING GROUPS condition
Matthew Wild <mwild1@gmail.com>
parents: 2576
diff changeset
424 in the condition.
1e1c929c1aa5 mod_firewall: Add and document CROSSING GROUPS condition
Matthew Wild <mwild1@gmail.com>
parents: 2576
diff changeset
425
1e1c929c1aa5 mod_firewall: Add and document CROSSING GROUPS condition
Matthew Wild <mwild1@gmail.com>
parents: 2576
diff changeset
426 In the above example, a user who is member of both groups is not restricted.
2540
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
427
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
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428 #### SENT DIRECTED PRESENCE TO SENDER
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Matthew Wild <mwild1@gmail.com>
parents: 2410
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429
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
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430 This condition matches if the recipient of a stanza has previously sent directed presence to the sender of the stanza. This
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
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431 is often done in XMPP to exchange presence information with JIDs that are not on your roster, such as MUC rooms.
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parents: 2410
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432
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Matthew Wild <mwild1@gmail.com>
parents: 2410
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433 This condition does not take a parameter - end the condition name with a question mark:
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
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434
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Matthew Wild <mwild1@gmail.com>
parents: 2410
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435 # Rule to bounce messages from senders not in the roster who haven't been sent directed presence
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
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436 NOT IN ROSTER?
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Matthew Wild <mwild1@gmail.com>
parents: 2410
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437 NOT SENT DIRECTED PRESENCE TO SENDER?
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parents: 2410
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438 BOUNCE=service-unavailable
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parents: 2389
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439
5002
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Matthew Wild <mwild1@gmail.com>
parents: 4967
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440 ### Permissions
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
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441
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parents: 4967
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442 Rules can consult Prosody's internal role and permissions system to check whether a certain action may
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443 be performed. The acting entity, their role, and appropriate context is automatically inferred. All you
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
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parents: 4967
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444 need to do is provide the identifier of the permission that should be checked.
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
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parents: 4967
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445
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
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446 Condition Description
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
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447 ----------------------- --------------------------------------------------------------------
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
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parents: 4967
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448 `MAY=permission` Checks whether 'permission' is allowed in the current context.
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
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449
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
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450 As with all other conditions, `MAY` can be combined with `NOT` to negate the result of the check.
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
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parents: 4967
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451
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
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452 Example, blocking outgoing stanzas from users with roles that do not allow the 'xmpp:federate' permission:
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
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453
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
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454 ```
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
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455 ::deliver_remote
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
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456 MAY NOT: xmpp:federate
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
diff changeset
457 BOUNCE=policy-violation (You are not allowed access to the federation)
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
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458 ```
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
diff changeset
459
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
diff changeset
460 ### Roles
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
diff changeset
461
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
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462 Condition Matches
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
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463 ---------------- -------------------------------------------------------------------------------------
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
diff changeset
464 `TO ROLE` When the recipient JID of the stanza has the named role
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
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parents: 4967
diff changeset
465 `FROM ROLE` When the sender JID of the stanza has the named role
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
diff changeset
466
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
diff changeset
467 **Note:** In most cases, you should avoid checking for specific roles, and instead check for
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
diff changeset
468 permissions granted by those roles (using the 'MAY' condition).
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
diff changeset
469
2390
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Matthew Wild <mwild1@gmail.com>
parents: 2389
diff changeset
470 ### Admins
28fbe960adcf mod_firewall: README: Document conditions for groups and admins
Matthew Wild <mwild1@gmail.com>
parents: 2389
diff changeset
471
5002
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
diff changeset
472 **Deprecated:** These conditions should no longer be used. Prefer 'MAY', 'TO ROLE' or 'FROM ROLE'.
84997bc3f92e mod_firewall: Update for role-auth (backwards compatible)
Matthew Wild <mwild1@gmail.com>
parents: 4967
diff changeset
473
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Matthew Wild <mwild1@gmail.com>
parents: 2389
diff changeset
474 Prosody allows certain JIDs to be declared as administrators of a host, component or the whole server.
28fbe960adcf mod_firewall: README: Document conditions for groups and admins
Matthew Wild <mwild1@gmail.com>
parents: 2389
diff changeset
475
2576
95b79d515a65 mod_firewall: README: Document TO/FROM ADMIN, FORWARD, TO SELF and TO FULL JID
Matthew Wild <mwild1@gmail.com>
parents: 2559
diff changeset
476 Condition Matches
95b79d515a65 mod_firewall: README: Document TO/FROM ADMIN, FORWARD, TO SELF and TO FULL JID
Matthew Wild <mwild1@gmail.com>
parents: 2559
diff changeset
477 ---------------- -------------------------------------------------------------------------------------
95b79d515a65 mod_firewall: README: Document TO/FROM ADMIN, FORWARD, TO SELF and TO FULL JID
Matthew Wild <mwild1@gmail.com>
parents: 2559
diff changeset
478 `TO ADMIN` When the recipient of the stanza is admin of the current host
95b79d515a65 mod_firewall: README: Document TO/FROM ADMIN, FORWARD, TO SELF and TO FULL JID
Matthew Wild <mwild1@gmail.com>
parents: 2559
diff changeset
479 `FROM ADMIN` When the sender of the stanza is admin of the current host
95b79d515a65 mod_firewall: README: Document TO/FROM ADMIN, FORWARD, TO SELF and TO FULL JID
Matthew Wild <mwild1@gmail.com>
parents: 2559
diff changeset
480 `FROM ADMIN OF` When the sender of the stanza is an admin of the named host on the current server
95b79d515a65 mod_firewall: README: Document TO/FROM ADMIN, FORWARD, TO SELF and TO FULL JID
Matthew Wild <mwild1@gmail.com>
parents: 2559
diff changeset
481 `TO ADMIN OF` When the recipient of the stanza is an admin of the named host on the current server
2390
28fbe960adcf mod_firewall: README: Document conditions for groups and admins
Matthew Wild <mwild1@gmail.com>
parents: 2389
diff changeset
482
1803
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Kim Alvefur <zash@zash.se>
parents: 1782
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483 ### Time and date
1782
29f3d6b7ad16 Import wiki pages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
484
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parents: 1782
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485 #### TIME
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parents: 1782
diff changeset
486
1782
29f3d6b7ad16 Import wiki pages
Kim Alvefur <zash@zash.se>
parents:
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487 Matches stanzas sent during certain time periods.
29f3d6b7ad16 Import wiki pages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
488
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parents: 1782
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489 Condition Matches
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parents: 1782
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490 ----------- -------------------------------------------------------------------------------------------
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parents: 1782
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491 TIME When the current server local time is within one of the comma-separated time ranges given
1782
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
492
1803
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Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
493 TIME: 10pm-6am, 14:00-15:00
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Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
494 REPLY=Zzzz.
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
495
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
496 #### DAY
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
497
1782
29f3d6b7ad16 Import wiki pages
Kim Alvefur <zash@zash.se>
parents:
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498 It is also possible to match only on certain days of the week.
29f3d6b7ad16 Import wiki pages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
499
1803
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parents: 1782
diff changeset
500 Condition Matches
4d73a1a6ba68 Convert all wiki pages to Markdown
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parents: 1782
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501 ----------- -----------------------------------------------------------------------------------------------------
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
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502 DAY When the current day matches one, or falls within a rage, in the given comma-separated list of days
1782
29f3d6b7ad16 Import wiki pages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
503
29f3d6b7ad16 Import wiki pages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
504 Example:
1803
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
505
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
506 DAY: Sat-Sun, Wednesday
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
507 REPLY=Sorry, I'm out enjoying life!
1782
29f3d6b7ad16 Import wiki pages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
508
2102
2c225b4b93d2 mod_firewall: README: Add note about time functions using server's local time
Matthew Wild <mwild1@gmail.com>
parents: 2096
diff changeset
509 All times and dates are handled in the server's local time.
2c225b4b93d2 mod_firewall: README: Add note about time functions using server's local time
Matthew Wild <mwild1@gmail.com>
parents: 2096
diff changeset
510
1803
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parents: 1782
diff changeset
511 ### Rate-limiting
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
512
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
513 It is possible to selectively rate-limit stanzas, and use rules to
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
514 decide what to do with stanzas when over the limit.
1782
29f3d6b7ad16 Import wiki pages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
515
1803
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Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
516 First, you must define any rate limits that you are going to use in your
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
517 script. Here we create a limiter called 'normal' that will allow 2
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
518 stanzas per second, and then we define a rule to bounce messages when
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
519 over this limit. Note that the `RATE` definition is not part of a rule
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
520 (multiple rules can share the same limiter).
1782
29f3d6b7ad16 Import wiki pages
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parents:
diff changeset
521
1803
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Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
522 %RATE normal: 2 (burst 3)
1782
29f3d6b7ad16 Import wiki pages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
523
1803
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
524 KIND: message
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
525 LIMIT: normal
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
526 BOUNCE=policy-violation (Sending too fast!)
1782
29f3d6b7ad16 Import wiki pages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
527
1803
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parents: 1782
diff changeset
528 The 'burst' parameter on the rate limit allows you to spread the limit
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
529 check over a given time period. For example the definition shown above
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
530 will allow the limit to be temporarily surpassed, as long as it is
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
531 within the limit after 3 seconds. You will almost always want to specify
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
532 a burst factor.
1782
29f3d6b7ad16 Import wiki pages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
533
1803
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Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
534 Both the rate and the burst can be fractional values. For example a rate
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
535 of 0.1 means only one event is allowed every 10 seconds.
1782
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
536
1803
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parents: 1782
diff changeset
537 The LIMIT condition actually does two things; first it counts against
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
538 the given limiter, and then it checks to see if the limiter over its
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
539 limit yet. If it is, the condition matches, otherwise it will not.
1782
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
540
1803
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parents: 1782
diff changeset
541 Condition Matches
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
542 ----------- --------------------------------------------------------------------------------------------------
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
543 `LIMIT` When the named limit is 'used up'. Using this condition automatically counts against that limit.
1782
29f3d6b7ad16 Import wiki pages
Kim Alvefur <zash@zash.se>
parents:
diff changeset
544
1803
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diff changeset
545 **Note:** Reloading mod\_firewall resets the current state of any
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
546 limiters.
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
547
2369
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Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
548 #### Dynamic limits
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
549
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
550 Sometimes you may want to have multiple throttles in a single condition, using some property of the session or stanza
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
551 to determine which throttle to use. For example, you might have a limit for incoming stanzas, but you want to limit by
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
552 sending JID, instead of all incoming stanzas sharing the same limit.
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
553
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
554 You can use the 'on' keyword for this, like so:
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Matthew Wild <mwild1@gmail.com>
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diff changeset
555
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
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diff changeset
556 LIMIT: normal on EXPRESSION
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
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diff changeset
557
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558 For more information on [expressions](#expressions), see the section later in this document.
2369
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diff changeset
559
2370
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diff changeset
560 Each value of 'EXPRESSION' has to be tracked individually in a table, which uses a small amount of memory. To prevent
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561 memory exhaustion, the number of tracked values is limited to 1000 by default. You can override this by setting the
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diff changeset
562 maximum number of table entries when you define the rate:
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Matthew Wild <mwild1@gmail.com>
parents: 2369
diff changeset
563
5fe483b73fd2 mod_firewall: Rate limiting: Document 'entries' and add option to allow overflowing when full
Matthew Wild <mwild1@gmail.com>
parents: 2369
diff changeset
564 %RATE normal: 2 (burst 3) (entries 4096)
5fe483b73fd2 mod_firewall: Rate limiting: Document 'entries' and add option to allow overflowing when full
Matthew Wild <mwild1@gmail.com>
parents: 2369
diff changeset
565
5fe483b73fd2 mod_firewall: Rate limiting: Document 'entries' and add option to allow overflowing when full
Matthew Wild <mwild1@gmail.com>
parents: 2369
diff changeset
566 Old values are automatically removed from the tracking table. However if the tracking table becomes full, new entries
5fe483b73fd2 mod_firewall: Rate limiting: Document 'entries' and add option to allow overflowing when full
Matthew Wild <mwild1@gmail.com>
parents: 2369
diff changeset
567 will be rejected - it will behave as if the rate limit was reached, even for values that have not been seen before. Since
5fe483b73fd2 mod_firewall: Rate limiting: Document 'entries' and add option to allow overflowing when full
Matthew Wild <mwild1@gmail.com>
parents: 2369
diff changeset
568 this opens up a potential denial of service (innocent users may be affected if malicious users can fill up the tracking
5fe483b73fd2 mod_firewall: Rate limiting: Document 'entries' and add option to allow overflowing when full
Matthew Wild <mwild1@gmail.com>
parents: 2369
diff changeset
569 table within the limit period). You can choose to instead "fail open", and allow the rate limit to be temporarily bypassed
5fe483b73fd2 mod_firewall: Rate limiting: Document 'entries' and add option to allow overflowing when full
Matthew Wild <mwild1@gmail.com>
parents: 2369
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570 when the table is full. To choose this behaviour, add `(allow overflow)` to the RATE definition.
5fe483b73fd2 mod_firewall: Rate limiting: Document 'entries' and add option to allow overflowing when full
Matthew Wild <mwild1@gmail.com>
parents: 2369
diff changeset
571
2108
573fe9825fba mod_firewall: README: Document session marking
Matthew Wild <mwild1@gmail.com>
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diff changeset
572 ### Session marking
573fe9825fba mod_firewall: README: Document session marking
Matthew Wild <mwild1@gmail.com>
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573
573fe9825fba mod_firewall: README: Document session marking
Matthew Wild <mwild1@gmail.com>
parents: 2105
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574 It is possible to 'mark' sessions (see the MARK_ORIGIN action below). To match stanzas from marked sessions, use the
573fe9825fba mod_firewall: README: Document session marking
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575 `ORIGIN_MARKED` condition.
573fe9825fba mod_firewall: README: Document session marking
Matthew Wild <mwild1@gmail.com>
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576
573fe9825fba mod_firewall: README: Document session marking
Matthew Wild <mwild1@gmail.com>
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577 Condition Description
573fe9825fba mod_firewall: README: Document session marking
Matthew Wild <mwild1@gmail.com>
parents: 2105
diff changeset
578 ------------------------------- ---------------------------------------------------------------
2540
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Matthew Wild <mwild1@gmail.com>
parents: 2410
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579 ORIGIN MARKED: markname Matches if the origin has been marked with 'markname'.
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Matthew Wild <mwild1@gmail.com>
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580 ORIGIN MARKED: markname (Xs) Matches if the origin has been marked with 'markname' within the past X seconds.
2108
573fe9825fba mod_firewall: README: Document session marking
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581
573fe9825fba mod_firewall: README: Document session marking
Matthew Wild <mwild1@gmail.com>
parents: 2105
diff changeset
582 Example usage:
573fe9825fba mod_firewall: README: Document session marking
Matthew Wild <mwild1@gmail.com>
parents: 2105
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583
573fe9825fba mod_firewall: README: Document session marking
Matthew Wild <mwild1@gmail.com>
parents: 2105
diff changeset
584 # This rule drops messages from sessions that have been marked as spammers in the past hour
2540
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Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
585 ORIGIN MARKED: spammer (3600s)
2108
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Matthew Wild <mwild1@gmail.com>
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586 DROP.
573fe9825fba mod_firewall: README: Document session marking
Matthew Wild <mwild1@gmail.com>
parents: 2105
diff changeset
587
573fe9825fba mod_firewall: README: Document session marking
Matthew Wild <mwild1@gmail.com>
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588 # This rule marks the origin session as a spammer if they send a message to a honeypot JID
573fe9825fba mod_firewall: README: Document session marking
Matthew Wild <mwild1@gmail.com>
parents: 2105
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589 KIND: message
573fe9825fba mod_firewall: README: Document session marking
Matthew Wild <mwild1@gmail.com>
parents: 2105
diff changeset
590 TO: honeypot@example.com
2540
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Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
591 MARK ORIGIN=spammer
2108
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diff changeset
592
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593 Actions
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594 -------
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595
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596 Actions come after all conditions in a rule block. There must be at
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597 least one action, though conditions are optional.
1782
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598
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599 An action without parameters ends with a full-stop/period ('.'), and one
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diff changeset
600 with parameters uses an equals sign ('='):
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601
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602 # An action with no parameters:
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603 DROP.
1782
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diff changeset
604
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diff changeset
605 # An action with a parameter:
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606 REPLY=Hello, this is a reply.
1782
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parents:
diff changeset
607
1803
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diff changeset
608 ### Route modification
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diff changeset
609
5234
f6c71d9d6dc0 mod_firewall: README: Clarify docs about some of the stanza processing actions
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parents: 5002
diff changeset
610 The following common actions modify the stanza's route in some way. These
f6c71d9d6dc0 mod_firewall: README: Clarify docs about some of the stanza processing actions
Matthew Wild <mwild1@gmail.com>
parents: 5002
diff changeset
611 rules will halt further processing of the stanza - no further actions will be
f6c71d9d6dc0 mod_firewall: README: Clarify docs about some of the stanza processing actions
Matthew Wild <mwild1@gmail.com>
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diff changeset
612 executed, and no further rules will be checked.
1782
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parents:
diff changeset
613
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614 Action Description
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diff changeset
615 ----------------------- ---------------------------------------------------------------------------------------------------------------------------------------------------------
2559
99b32f77f00d mod_firewall: Document PASS, RETURN and DEFAULT
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diff changeset
616 `PASS.` Stop executing actions and rules on this stanza, and let it through this chain and any calling chains.
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617 `DROP.` Stop executing actions and rules on this stanza, and discard it.
2559
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parents: 2545
diff changeset
618 `DEFAULT.` Stop executing actions and rules on this stanza, prevent any other scripts/modules from handling it, to trigger the appropriate default "unhandled stanza" behaviour. Do not use in custom chains (it is treated as PASS).
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619 `REDIRECT=jid` Redirect the stanza to the given JID.
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620 `BOUNCE.` Bounce the stanza with the default error (usually service-unavailable)
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diff changeset
621 `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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diff changeset
622 `BOUNCE=error (text)` As above, but include the supplied human-readable text with a description of the error
5234
f6c71d9d6dc0 mod_firewall: README: Clarify docs about some of the stanza processing actions
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parents: 5002
diff changeset
623
f6c71d9d6dc0 mod_firewall: README: Clarify docs about some of the stanza processing actions
Matthew Wild <mwild1@gmail.com>
parents: 5002
diff changeset
624 **Note:** It is incorrect behaviour to reply to an 'error' stanza with another error, so BOUNCE will simply act the same as 'DROP' for stanzas that should not be bounced (error stanzas and iq results).
f6c71d9d6dc0 mod_firewall: README: Clarify docs about some of the stanza processing actions
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diff changeset
625
f6c71d9d6dc0 mod_firewall: README: Clarify docs about some of the stanza processing actions
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parents: 5002
diff changeset
626 ### Replying and forwarding
f6c71d9d6dc0 mod_firewall: README: Clarify docs about some of the stanza processing actions
Matthew Wild <mwild1@gmail.com>
parents: 5002
diff changeset
627
f6c71d9d6dc0 mod_firewall: README: Clarify docs about some of the stanza processing actions
Matthew Wild <mwild1@gmail.com>
parents: 5002
diff changeset
628 These actions cause a new stanza to be generated and sent somewhere.
f6c71d9d6dc0 mod_firewall: README: Clarify docs about some of the stanza processing actions
Matthew Wild <mwild1@gmail.com>
parents: 5002
diff changeset
629 Processing of the original stanza will continue beyond these actions.
f6c71d9d6dc0 mod_firewall: README: Clarify docs about some of the stanza processing actions
Matthew Wild <mwild1@gmail.com>
parents: 5002
diff changeset
630
5235
d0d251abf595 mod_firewall: Add 'REPORT TO' to report (XEP-0377) a stanza to a specified JID
Matthew Wild <mwild1@gmail.com>
parents: 5234
diff changeset
631 Action Description
d0d251abf595 mod_firewall: Add 'REPORT TO' to report (XEP-0377) a stanza to a specified JID
Matthew Wild <mwild1@gmail.com>
parents: 5234
diff changeset
632 ------------------------ ---------------------------------------------------------------------------------------------------------------------------------------------------------
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diff changeset
633 `REPLY=text` Reply to the stanza (assumed to be a message) with the given text.
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parents: 5234
diff changeset
634 `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.
d0d251abf595 mod_firewall: Add 'REPORT TO' to report (XEP-0377) a stanza to a specified JID
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parents: 5234
diff changeset
635 `FORWARD=jid` Forward a copy of the stanza to the given JID (using XEP-0297). The stanza will be sent from the current host's JID.
d0d251abf595 mod_firewall: Add 'REPORT TO' to report (XEP-0377) a stanza to a specified JID
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parents: 5234
diff changeset
636
d0d251abf595 mod_firewall: Add 'REPORT TO' to report (XEP-0377) a stanza to a specified JID
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diff changeset
637 ### Reporting
d0d251abf595 mod_firewall: Add 'REPORT TO' to report (XEP-0377) a stanza to a specified JID
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parents: 5234
diff changeset
638
d0d251abf595 mod_firewall: Add 'REPORT TO' to report (XEP-0377) a stanza to a specified JID
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parents: 5234
diff changeset
639 Action Description
d0d251abf595 mod_firewall: Add 'REPORT TO' to report (XEP-0377) a stanza to a specified JID
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parents: 5234
diff changeset
640 ------------------------ ---------------------------------------------------------------------------------------------------------------------------------------------------------
d0d251abf595 mod_firewall: Add 'REPORT TO' to report (XEP-0377) a stanza to a specified JID
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parents: 5234
diff changeset
641 `REPORT=jid reason text` Forwards the full stanza to `jid` with a XEP-0377 abuse report attached.
d0d251abf595 mod_firewall: Add 'REPORT TO' to report (XEP-0377) a stanza to a specified JID
Matthew Wild <mwild1@gmail.com>
parents: 5234
diff changeset
642
d0d251abf595 mod_firewall: Add 'REPORT TO' to report (XEP-0377) a stanza to a specified JID
Matthew Wild <mwild1@gmail.com>
parents: 5234
diff changeset
643 Only the `jid` is mandatory. The `reason` parameter should be either `abuse`, `spam` or a custom URI. If not specified, it defaults to `abuse`.
d0d251abf595 mod_firewall: Add 'REPORT TO' to report (XEP-0377) a stanza to a specified JID
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diff changeset
644 After the reason, some human-readable text may be included to explain the report.
d0d251abf595 mod_firewall: Add 'REPORT TO' to report (XEP-0377) a stanza to a specified JID
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parents: 5234
diff changeset
645
d0d251abf595 mod_firewall: Add 'REPORT TO' to report (XEP-0377) a stanza to a specified JID
Matthew Wild <mwild1@gmail.com>
parents: 5234
diff changeset
646 Example:
d0d251abf595 mod_firewall: Add 'REPORT TO' to report (XEP-0377) a stanza to a specified JID
Matthew Wild <mwild1@gmail.com>
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diff changeset
647
d0d251abf595 mod_firewall: Add 'REPORT TO' to report (XEP-0377) a stanza to a specified JID
Matthew Wild <mwild1@gmail.com>
parents: 5234
diff changeset
648 ```
d0d251abf595 mod_firewall: Add 'REPORT TO' to report (XEP-0377) a stanza to a specified JID
Matthew Wild <mwild1@gmail.com>
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diff changeset
649 KIND: message
d0d251abf595 mod_firewall: Add 'REPORT TO' to report (XEP-0377) a stanza to a specified JID
Matthew Wild <mwild1@gmail.com>
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diff changeset
650 TO: honeypot@example.com
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diff changeset
651 REPORT TO=antispam.example.com spam Caught by the honeypot!
d0d251abf595 mod_firewall: Add 'REPORT TO' to report (XEP-0377) a stanza to a specified JID
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parents: 5234
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652 DROP.
d0d251abf595 mod_firewall: Add 'REPORT TO' to report (XEP-0377) a stanza to a specified JID
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diff changeset
653 ```
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654
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655 ### Stanza modification
1782
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656
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657 These actions make it possible to modify the content and structure of a
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658 stanza.
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659
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660 Action Description
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661 ------------------------ ------------------------------------------------------------------------
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662 `STRIP=name` Remove any child elements with the given name in the default namespace
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663 `STRIP=name namespace` Remove any child elements with the given name and the given namespace
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664 `INJECT=xml` Inject the given XML into the stanza as a child element
1782
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665
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diff changeset
666 ### Sessions
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parents: 2105
diff changeset
667
573fe9825fba mod_firewall: README: Document session marking
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diff changeset
668 It is possible to mark sessions, and then use these marks to match rules later on.
573fe9825fba mod_firewall: README: Document session marking
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diff changeset
669
573fe9825fba mod_firewall: README: Document session marking
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diff changeset
670 Action Description
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Matthew Wild <mwild1@gmail.com>
parents: 2105
diff changeset
671 ------------------------ --------------------------------------------------------------------------
2540
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diff changeset
672 `MARK ORIGIN=mark` Marks the originating session with the given flag.
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673 `UNMARK ORIGIN=mark` Removes the given mark from the origin session (if it is set).
2108
573fe9825fba mod_firewall: README: Document session marking
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diff changeset
674
2114
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diff changeset
675 **Note:** Marks apply to sessions, not JIDs. E.g. if marking in a rule that matches a stanza received
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diff changeset
676 over s2s, it is the s2s session that is marked.
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diff changeset
677
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Matthew Wild <mwild1@gmail.com>
parents: 2111
diff changeset
678 It is possible to have multiple marks on an origin at any given time.
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parents: 2111
diff changeset
679
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680 ### Informational
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681
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682 Action Description
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
683 --------------- ------------------------------------------------------------------------------------------------------------------------
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
684 `LOG=message` Logs the given message to Prosody's log file. Optionally prefix it with a log level in square brackets, e.g. `[debug]`
2093
7b9520479e99 mod_firewall: README: Document LOG's ability to take meta expressions
Matthew Wild <mwild1@gmail.com>
parents: 2092
diff changeset
685
4236
c316ad1087d4 mod_firewall: Some additional documentation improvements, particularly adding section links where needed
Matthew Wild <mwild1@gmail.com>
parents: 4235
diff changeset
686 You can include [expressions](#expressions) in log messages, using `$(...)` syntax. For example, to log the stanza that matched the rule,
c316ad1087d4 mod_firewall: Some additional documentation improvements, particularly adding section links where needed
Matthew Wild <mwild1@gmail.com>
parents: 4235
diff changeset
687 you can use `$(stanza)`, or to log just the top tag of the stanza, use `$(stanza:top_tag())`. To fetch the sender JID, use `$(stanza.attr.from)`.
2093
7b9520479e99 mod_firewall: README: Document LOG's ability to take meta expressions
Matthew Wild <mwild1@gmail.com>
parents: 2092
diff changeset
688
7b9520479e99 mod_firewall: README: Document LOG's ability to take meta expressions
Matthew Wild <mwild1@gmail.com>
parents: 2092
diff changeset
689 Example:
7b9520479e99 mod_firewall: README: Document LOG's ability to take meta expressions
Matthew Wild <mwild1@gmail.com>
parents: 2092
diff changeset
690
7b9520479e99 mod_firewall: README: Document LOG's ability to take meta expressions
Matthew Wild <mwild1@gmail.com>
parents: 2092
diff changeset
691 # Log all stanzas to user@example.com:
7b9520479e99 mod_firewall: README: Document LOG's ability to take meta expressions
Matthew Wild <mwild1@gmail.com>
parents: 2092
diff changeset
692 TO: user@example.com
7b9520479e99 mod_firewall: README: Document LOG's ability to take meta expressions
Matthew Wild <mwild1@gmail.com>
parents: 2092
diff changeset
693 LOG=[debug] User received: $(stanza)
7b9520479e99 mod_firewall: README: Document LOG's ability to take meta expressions
Matthew Wild <mwild1@gmail.com>
parents: 2092
diff changeset
694
2369
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
695 More info about expressions can be found below.
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
696
2096
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
697 Chains
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
698 ------
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
699
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
700 Rules are grouped into "chains", which are injected at particular points in Prosody's routing code.
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
701
2559
99b32f77f00d mod_firewall: Document PASS, RETURN and DEFAULT
Matthew Wild <mwild1@gmail.com>
parents: 2545
diff changeset
702 Available built-in chains are:
2096
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
703
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
704 Chain Description
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
705 -------------- -------------------------------------------------------------------------------------------
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
706 deliver Applies to stanzas delivered to local recipients (regardless of the stanza's origin)
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
707 deliver_remote Applies to stanzas delivered to remote recipients (just before they leave the local server)
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
708 preroute Applies to incoming stanzas from local users, before any routing rules are applied
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
709
2111
4e434abaf8fc mod_firewall: README: Improve chain documentation
Matthew Wild <mwild1@gmail.com>
parents: 2110
diff changeset
710 A chain is begun by a line `::name` where 'name' is the name of the chain you want the following rules to be
4e434abaf8fc mod_firewall: README: Improve chain documentation
Matthew Wild <mwild1@gmail.com>
parents: 2110
diff changeset
711 inserted into. If no chain is specified, rules are put into the 'deliver' chain.
4e434abaf8fc mod_firewall: README: Improve chain documentation
Matthew Wild <mwild1@gmail.com>
parents: 2110
diff changeset
712
4965
d7684aa81d8f mod_firewall: README: Correct mention of 'JUMP_CHAIN' to 'JUMP CHAIN'
Matthew Wild <mwild1@gmail.com>
parents: 4583
diff changeset
713 It is possible to create custom chains (useful with the `JUMP CHAIN` action described below). User-created
2111
4e434abaf8fc mod_firewall: README: Improve chain documentation
Matthew Wild <mwild1@gmail.com>
parents: 2110
diff changeset
714 chains must begin with "user/", e.g. "user/spam_filtering".
2096
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
715
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
716 Example of chain use:
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
717
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
718 # example.com's firewall script
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
719
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
720 # This line is optional, because 'deliver' is the default chain anyway:
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
721 ::deliver
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
722
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
723 # This rule matches any stanzas delivered to our local user bob:
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
724 TO: bob@example.com
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
725 DROP.
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
726
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
727 # Oops! This rule will never match, because alice is not a local user,
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
728 # and only stanzas to local users go through the 'deliver' chain:
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
729 TO: alice@remote.example.com
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
730 DROP.
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
731
2104
384fb28452b9 mod_firewall: README: Improve chain usage example comments
Matthew Wild <mwild1@gmail.com>
parents: 2103
diff changeset
732 # Create a 'preroute' chain of rules (matched for incoming stanzas from local clients):
2096
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
733 ::preroute
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
734 # These rules are matched for outgoing stanzas from local clients
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
735
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
736 # This will match any stanzas sent to alice from a local user:
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
737 TO: alice@remote.example.com
b75d29a162cd mod_firewall: README: Document chains
Matthew Wild <mwild1@gmail.com>
parents: 2095
diff changeset
738 DROP.
2105
f2d5aa789646 mod_firewall: README: Document JUMP_CHAIN
Matthew Wild <mwild1@gmail.com>
parents: 2104
diff changeset
739
f2d5aa789646 mod_firewall: README: Document JUMP_CHAIN
Matthew Wild <mwild1@gmail.com>
parents: 2104
diff changeset
740 Action Description
f2d5aa789646 mod_firewall: README: Document JUMP_CHAIN
Matthew Wild <mwild1@gmail.com>
parents: 2104
diff changeset
741 ------------------------ ------------------------------------------------------------------------
2540
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
742 `JUMP CHAIN=name` Switches chains, and passes the stanza through the rules in chain 'name'. If the new chain causes the stanza to be dropped/redirected, the current chain halts further processing.
2559
99b32f77f00d mod_firewall: Document PASS, RETURN and DEFAULT
Matthew Wild <mwild1@gmail.com>
parents: 2545
diff changeset
743 `RETURN.` Stops executing the current chain and returns to the parent chain. For built-in chains, equivalent to PASS. RETURN is implicit at the end of every chain.
2369
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
744
2389
a753b21968c5 mod_firewall: README: Clarify that it's possible to jump to chains defined outside of the current file
Matthew Wild <mwild1@gmail.com>
parents: 2388
diff changeset
745 It is possible to jump to chains defined by other scripts and modules.
a753b21968c5 mod_firewall: README: Clarify that it's possible to jump to chains defined outside of the current file
Matthew Wild <mwild1@gmail.com>
parents: 2388
diff changeset
746
2369
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
747 Expressions
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
748 -----------
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
749
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
750 Some conditions and actions in rules support "expressions" in their parameters (their documentation will indicate if this is the case). Most parameters
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
751 are static once the firewall script is loaded and compiled internally, however parameters that allow expressions can be dynamically calculated when a
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
752 rule is being run.
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
753
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
754 There are two kinds of expression that you can use: stanza expressions, and code expressions.
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
755
2540
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
756 ### Stanza expressions
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
757
2369
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
758 Stanza expressions are of the form `$<...>`, where `...` is a stanza path. For syntax of stanza paths, see the documentation for the 'INSPECT' condition
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
759 above.
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
760
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
761 Example:
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
762
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
763 LOG=Matched a stanza from $<@from> to $<@to>
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
764
2540
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
765 There are built in functions which can be applied to the output of a stanza expression, by appending the pipe ('|') operator, followed by the function
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
766 name. These functions are:
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
767
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
768 Function Description
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
769 ------------ ---------------------------------------
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
770 bare Given a JID, strip any resource
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
771 node Return the node ('user part') of a JID
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
772 host Return the host ('domain') part of a JID
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
773 resource Return the resource part of a JID
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
774
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
775 For example, to apply a rate limit to stanzas per sender domain:
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
776
4072
2dcbc01c9931 mod_firewall: Fix example in README to use |host (thanks DebXWoody)
Matthew Wild <mwild1@gmail.com>
parents: 3197
diff changeset
777 LIMIT normal on $<@from|host>
2540
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
778
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
779 If the path does not match (e.g. the element isn't found, or the attribute doesn't exist) or any of the functions fail to produce an output (e.g. an invalid
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
780 JID was passed to a function that only handles valid JIDs) the expression will return the text `<undefined>`. You can override this by ending the expression
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
781 with a double pipe ('||') followed by a quoted string to use as a default instead. E.g. to default to the string "normal" when there is no 'type' attribute:
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
782
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
783 LOG=Stanza type is $<@type||"normal">
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
784
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
diff changeset
785 ### Code expressions
2369
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
786
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
787 Code expressions use `$(...)` syntax. Code expressions are powerful, and allow unconstrained access to Prosody's internal environment. Therefore
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
788 code expressions are typically for advanced use-cases only. You may want to refer to Prosody's [developer documentation](https://prosody.im/doc/developers)
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
789 for more information. In particular, within code expressions you may access the 'session' object, which is the session object of the origin of the stanza,
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
790 and the 'stanza' object, which is the stanza being considered within the current rule. Whatever value the expression returns will be converted to a string.
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
791
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
792 Example to limit stanzas per session type:
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
793
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
794 LIMIT: normal on $(session.type)