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mod_firewall/README.markdown @ 2540:d637bc0ac604
mod_firewall: Update README for latest changes
| author | Matthew Wild <mwild1@gmail.com> |
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| date | Tue, 21 Feb 2017 10:39:00 +0000 |
| parent | 2410:898e70e85185 |
| child | 2545:9b46d24edf0d |
| rev | line source |
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1 --- |
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2 labels: |
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3 - 'Stage-Alpha' |
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4 summary: 'A rule-based stanza filtering module' |
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5 ... |
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6 |
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7 ------------------------------------------------------------------------ |
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9 **Note:** mod\_firewall is in its very early stages. This documentation |
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10 is liable to change, and some described functionality may be missing, |
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11 incomplete or contain bugs. |
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13 ------------------------------------------------------------------------ |
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15 Introduction |
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16 ============ |
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18 A firewall is an invaluable tool in the sysadmin's toolbox. However |
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19 while low-level firewalls such as iptables and pf are incredibly good at |
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20 what they do, they are generally not able to handle application-layer |
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21 rules. |
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23 The goal of mod\_firewall is to provide similar services at the XMPP |
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24 layer. Based on rule scripts it can efficiently block, bounce, drop, |
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25 forward, copy, redirect stanzas and more! Furthermore all rules can be |
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26 applied and updated dynamically at runtime without restarting the |
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27 server. |
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29 Details |
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30 ======= |
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32 mod\_firewall loads one or more scripts, and compiles these to Lua code |
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33 that reacts to stanzas flowing through Prosody. The firewall script |
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34 syntax is unusual, but straightforward. |
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36 A firewall script is dominated by rules. Each rule has two parts: |
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37 conditions, and actions. When a stanza matches all of the conditions, |
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38 all of the actions are executed in order. |
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| 40 Here is a simple example to block stanzas from spammer@example.com: | |
| 41 | |
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42 FROM: spammer@example.com |
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43 DROP. |
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45 FROM is a condition, and DROP is an action. This is about as simple as |
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46 it gets. How about heading to the other extreme? Let's demonstrate |
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47 something more complex that mod\_firewall can do for you: |
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49 %ZONE myorganisation: staff.myorg.example, support.myorg.example |
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51 ENTERING: myorganisation |
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52 KIND: message |
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53 TIME: 12am-9am, 5pm-12am, Saturday, Sunday |
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54 REPLY=Sorry, I am afraid our office is closed at the moment. If you need assistance, please call our 24-hour support line on 123-456-789. |
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56 This rule will reply with a short message whenever someone tries to send |
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57 a message to someone at any of the hosts defined in the 'myorganisation' |
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58 outside of office hours. |
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60 Specifying rule sets |
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61 -------------------- |
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62 |
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63 Firewall rules should be written into text files, e.g. `ruleset.pfw` file. |
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64 One or more rule files can be specified in the configuration using: |
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65 |
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66 firewall_scripts = { "path/to/ruleset.pfw", "path/to/ruleset2.pfw" } |
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67 |
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68 If multiple files are specified and they both add rules to the same chains, |
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69 each file's rules will be processed in order, but the order of files is undefined. |
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71 Conditions |
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72 ---------- |
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73 |
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74 All conditions must come before any action in a rule block. The |
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75 condition name is followed by a colon (':'), and the value to test for. |
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77 A condition can be preceded or followed by `NOT` to negate its match. |
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78 For example: |
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80 NOT FROM: user@example.com |
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81 KIND NOT: message |
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83 Some conditions do not take parameters, and these should end with just a |
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84 question mark, like: |
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85 |
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86 IN ROSTER? |
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87 |
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88 ### Zones |
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90 A 'zone' is one or more hosts or JIDs. It is possible to match when a |
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91 stanza is entering or leaving a zone, while at the same time not |
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92 matching traffic passing between JIDs in the same zone. |
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94 Zones are defined at the top of a script with the following syntax (they |
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95 are not part of a rule block): |
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97 %ZONE myzone: host1, host2, user@host3, foo.bar.example |
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99 There is an automatic zone named `$local`, which automatically includes |
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100 all of the current server's active hosts (including components). It can |
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101 be used to match stanzas entering or leaving the current server. |
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102 |
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103 A host listed in a zone also matches all users on that host (but not |
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104 subdomains). |
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| 106 The following zone-matching conditions are supported: | |
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108 Condition Matches |
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109 ------------ ------------------------------------------ |
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110 `ENTERING` When a stanza is entering the named zone |
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111 `LEAVING` When a stanza is leaving the named zone |
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113 ### Lists |
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114 |
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115 It is possible to create or load lists of strings for use in scripts. For example, you might load a JID blacklist, |
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116 a list of malware URLs or simple words that you want to filter messages on. |
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117 |
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118 List type Example |
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119 ----------- ----------------------- |
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120 memory %LIST spammers: memory |
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121 file %LIST spammers: file:/etc/spammers.txt |
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122 http %LIST spammers: http://example.com/spammers.txt |
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123 |
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124 #### CHECK LIST |
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125 |
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126 Checks whether a simple expression is found in a given list. |
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127 |
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128 Example: |
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129 |
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130 %LIST blacklist: file:/etc/prosody/blacklist.txt |
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131 |
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132 # Rule to block presence subscription requests from blacklisted JIDs |
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133 KIND: presence |
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134 TYPE: subscribe |
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135 CHECK LIST: blacklist contains $<@from> |
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136 BOUNCE=policy-violation (Your JID is blacklisted) |
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137 |
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138 #### SCAN |
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140 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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141 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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142 |
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143 Before using SCAN, you need to define a search location and a pattern. The search location uses the same 'path' |
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144 format as documented under the 'INSPECT' condition. Patterns can be any valid Lua pattern. |
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145 |
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146 To use the above example: |
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147 |
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148 # Define a search location called 'body' which fetches the text of the 'body' element |
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149 %SEARCH body: body# |
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150 # Define a pattern called 'word' which matches any sequence of letters |
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151 %PATTERN word: [A-Za-z]+ |
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152 # Finally, we also need our list of "bad" words: |
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153 %LIST badwords: file:/etc/prosody/bad_words.txt |
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154 |
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155 # Now we can use these to SCAN incoming stanzas |
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156 # If it finds a match, bounce the stanza |
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157 SCAN: body for word in badwords |
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158 BOUNCE=policy-violation (This word is not allowed!) |
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159 |
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160 ### Stanza matching |
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162 Condition Matches |
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163 ----------- ------------------------------------------------------------------------------------------------------------------------------------------------------------ |
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164 `KIND` The kind of stanza. May be 'message', 'presence' or 'iq' |
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165 `TYPE` The type of stanza. This varies depending on the kind of stanza. See 'Stanza types' below for more information. |
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166 `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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167 `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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168 |
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169 #### Stanza types |
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171 Stanza Valid types |
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172 ---------- ------------------------------------------------------------------------------------------ |
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173 iq get, set, result, error |
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174 presence *available*, unavailable, probe, subscribe, subscribed, unsubscribe, unsubscribed, error |
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175 message normal, chat, groupchat, headline, error |
| 1782 | 176 |
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177 **Note:** The type 'available' for presence does not actually appear in |
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178 the protocol. Available presence is signalled by the omission of a type. |
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179 Similarly, a message stanza with no type is equivalent to one of type |
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180 'normal'. mod\_firewall handles these cases for you automatically. |
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182 ### Sender/recipient matching |
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184 Condition Matches |
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185 ----------- ------------------------------------------------------- |
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186 `FROM` The JID in the 'from' attribute matches the given JID |
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187 `TO` The JID in the 'to' attribute matches the given JID |
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189 These conditions both accept wildcards in the JID when the wildcard |
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190 expression is enclosed in angle brackets ('\<...\>'). For example: |
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191 |
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192 # All users at example.com |
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193 FROM: <*>@example.com |
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195 # The user 'admin' on any subdomain of example.com |
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196 FROM: admin@<*.example.com> |
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197 |
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198 You can also use [Lua's pattern |
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199 matching](http://www.lua.org/manual/5.1/manual.html#5.4.1) for more |
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200 powerful matching abilities. Patterns are a lightweight |
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201 regular-expression alternative. Simply contain the pattern in double |
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202 angle brackets. The pattern is automatically anchored at the start and |
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203 end (so it must match the entire portion of the JID). |
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205 # Match admin@example.com, and admin1@example.com, etc. |
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206 FROM: <<admin%d*>>@example.com |
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207 |
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208 **Note:** It is important to know that 'example.com' is a valid JID on |
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209 its own, and does **not** match 'user@example.com'. To perform domain |
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210 whitelists or blacklists, use Zones. |
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| 2047 | 212 Condition Matches |
| 213 ---------------- --------------------------------------------------------------- | |
| 214 `FROM_EXACTLY` The JID in the 'from' attribute exactly matches the given JID | |
| 215 `TO_EXACTLY` The JID in the 'to' attribute exactly matches the given JID | |
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216 |
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217 These additional conditions do not support pattern matching, but are |
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218 useful to match the exact to/from address on a stanza. For example, if |
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219 no resource is specified then only bare JIDs will be matched. TO and FROM |
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220 match all resources if no resource is specified to match. |
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221 |
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222 **Note:** Some chains execute before Prosody has performed any |
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223 normalisation or validity checks on the to/from JIDs on an incoming |
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224 stanza. It is not advisable to perform access control or similar rules |
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225 on JIDs in these chains (see the chain documentation for more info). |
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227 #### INSPECT |
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228 |
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229 INSPECT takes a 'path' through the stanza to get a string (an attribute |
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230 value or text content). An example is the best way to explain. Let's |
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231 check that a user is not trying to register an account with the username |
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232 'admin'. This stanza comes from [XEP-0077: In-band |
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233 Registration](http://xmpp.org/extensions/xep-0077.html#example-4): |
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234 |
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235 ``` xml |
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236 <iq type='set' id='reg2'> |
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237 <query xmlns='jabber:iq:register'> |
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238 <username>bill</username> |
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239 <password>Calliope</password> |
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240 <email>bard@shakespeare.lit</email> |
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241 </query> |
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242 </iq> |
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243 ``` |
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244 |
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245 KIND: iq |
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246 TYPE: set |
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247 PAYLOAD: jabber:iq:register |
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248 INSPECT: {jabber:iq:register}query/username#=admin |
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249 BOUNCE=not-allowed (The username 'admin' is reserved.) |
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250 |
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251 That weird string deserves some explanation. It is a path, divided into |
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252 segments by '/'. Each segment describes an element by its name, |
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253 optionally prefixed by its namespace in curly braces ('{...}'). If the |
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254 path ends with a '\#' then the text content of the last element will be |
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255 returned. If the path ends with '@name' then the value of the attribute |
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256 'name' will be returned. |
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257 |
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258 You can use INSPECT to test for the existence of an element or attribute, |
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259 or you can see if it is equal to a string by appending `=STRING` (as in the |
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260 example above). Finally,you can also test whether it matches a given Lua |
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261 pattern by using `~=PATTERN`. |
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262 |
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263 INSPECT is somewhat slower than the other stanza matching conditions. To |
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264 minimise performance impact, always place it below other faster |
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265 condition checks where possible (e.g. above we first checked KIND, TYPE |
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266 and PAYLOAD matched before INSPECT). |
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267 |
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268 ### Roster |
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269 |
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270 These functions access the roster of the recipient (only). Therefore they cannot (currently) |
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271 be used in some chains, such as for outgoing messages (the recipient may be on another server). |
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272 |
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273 Performance note: this check can potentially cause storage access (especially if the recipient |
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274 is currently offline), so you may want to limit its use in high-traffic situations, and place |
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275 it below other checks (such as a rate limiter). |
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276 |
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277 #### IN ROSTER |
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278 |
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279 Tests whether the sender is in the recipient's roster. |
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280 |
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281 IN ROSTER? |
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282 |
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283 #### IN ROSTER GROUP |
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284 |
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285 Tests whether the sender is in the recipient's roster, and in the named group. |
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286 |
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287 IN ROSTER GROUP: Friends |
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288 |
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289 #### SUBSCRIBED |
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290 |
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291 Tests whether the recipient is subscribed to the sender, ie will receive |
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292 presence updates from them. |
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293 |
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294 Note that this *does* work, regardless of direction and which chain is |
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295 used, since both the sender and the recipient will have mirrored roster |
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296 entries. |
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297 |
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298 ### Groups |
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299 |
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300 Using Prosody's mod\_groups it is possible to define groups of users on the server. You can |
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301 match based on these groups in firewall rules. |
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302 |
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303 Condition Matches |
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304 ------------- ---------------------------- |
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305 `FROM GROUP` When the stanza is being sent from a member of the named group |
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306 `TO GROUP` When the stanza is being sent to a member of the named group |
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307 |
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308 #### SENT DIRECTED PRESENCE TO SENDER |
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309 |
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310 This condition matches if the recipient of a stanza has previously sent directed presence to the sender of the stanza. This |
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311 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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312 |
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313 This condition does not take a parameter - end the condition name with a question mark: |
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314 |
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315 # Rule to bounce messages from senders not in the roster who haven't been sent directed presence |
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316 NOT IN ROSTER? |
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317 NOT SENT DIRECTED PRESENCE TO SENDER? |
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318 BOUNCE=service-unavailable |
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319 |
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320 ### Admins |
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321 |
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322 Prosody allows certain JIDs to be declared as administrators of a host, component or the whole server. |
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323 |
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324 Condition Matches |
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325 -------------- ---------------------------------- |
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326 FROM ADMIN OF When the sender of the stanza is an admin of the named host on the current server |
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327 TO ADMIN OF When the recipient of the stanza is an admin of the named host on the current server |
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328 |
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329 ### Time and date |
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331 #### TIME |
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332 |
| 1782 | 333 Matches stanzas sent during certain time periods. |
| 334 | |
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335 Condition Matches |
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336 ----------- ------------------------------------------------------------------------------------------- |
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337 TIME When the current server local time is within one of the comma-separated time ranges given |
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339 TIME: 10pm-6am, 14:00-15:00 |
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340 REPLY=Zzzz. |
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341 |
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342 #### DAY |
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343 |
| 1782 | 344 It is also possible to match only on certain days of the week. |
| 345 | |
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346 Condition Matches |
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347 ----------- ----------------------------------------------------------------------------------------------------- |
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348 DAY When the current day matches one, or falls within a rage, in the given comma-separated list of days |
| 1782 | 349 |
| 350 Example: | |
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351 |
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352 DAY: Sat-Sun, Wednesday |
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353 REPLY=Sorry, I'm out enjoying life! |
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355 All times and dates are handled in the server's local time. |
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356 |
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357 ### Rate-limiting |
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358 |
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359 It is possible to selectively rate-limit stanzas, and use rules to |
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360 decide what to do with stanzas when over the limit. |
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362 First, you must define any rate limits that you are going to use in your |
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363 script. Here we create a limiter called 'normal' that will allow 2 |
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364 stanzas per second, and then we define a rule to bounce messages when |
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365 over this limit. Note that the `RATE` definition is not part of a rule |
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366 (multiple rules can share the same limiter). |
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368 %RATE normal: 2 (burst 3) |
| 1782 | 369 |
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370 KIND: message |
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371 LIMIT: normal |
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372 BOUNCE=policy-violation (Sending too fast!) |
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374 The 'burst' parameter on the rate limit allows you to spread the limit |
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375 check over a given time period. For example the definition shown above |
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376 will allow the limit to be temporarily surpassed, as long as it is |
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377 within the limit after 3 seconds. You will almost always want to specify |
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378 a burst factor. |
| 1782 | 379 |
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380 Both the rate and the burst can be fractional values. For example a rate |
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381 of 0.1 means only one event is allowed every 10 seconds. |
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383 The LIMIT condition actually does two things; first it counts against |
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384 the given limiter, and then it checks to see if the limiter over its |
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385 limit yet. If it is, the condition matches, otherwise it will not. |
| 1782 | 386 |
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387 Condition Matches |
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388 ----------- -------------------------------------------------------------------------------------------------- |
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389 `LIMIT` When the named limit is 'used up'. Using this condition automatically counts against that limit. |
| 1782 | 390 |
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391 **Note:** Reloading mod\_firewall resets the current state of any |
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392 limiters. |
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393 |
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394 #### Dynamic limits |
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395 |
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396 Sometimes you may want to have multiple throttles in a single condition, using some property of the session or stanza |
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397 to determine which throttle to use. For example, you might have a limit for incoming stanzas, but you want to limit by |
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398 sending JID, instead of all incoming stanzas sharing the same limit. |
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399 |
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400 You can use the 'on' keyword for this, like so: |
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401 |
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402 LIMIT: normal on EXPRESSION |
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403 |
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404 For more information on expressions, see the section later in this document. |
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405 |
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406 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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407 memory exhaustion, the number of tracked values is limited to 1000 by default. You can override this by setting the |
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408 maximum number of table entries when you define the rate: |
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409 |
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410 %RATE normal: 2 (burst 3) (entries 4096) |
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411 |
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412 Old values are automatically removed from the tracking table. However if the tracking table becomes full, new entries |
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413 will be rejected - it will behave as if the rate limit was reached, even for values that have not been seen before. Since |
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414 this opens up a potential denial of service (innocent users may be affected if malicious users can fill up the tracking |
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415 table within the limit period). You can choose to instead "fail open", and allow the rate limit to be temporarily bypassed |
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416 when the table is full. To choose this behaviour, add `(allow overflow)` to the RATE definition. |
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417 |
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418 ### Session marking |
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419 |
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420 It is possible to 'mark' sessions (see the MARK_ORIGIN action below). To match stanzas from marked sessions, use the |
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421 `ORIGIN_MARKED` condition. |
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422 |
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423 Condition Description |
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424 ------------------------------- --------------------------------------------------------------- |
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425 ORIGIN MARKED: markname Matches if the origin has been marked with 'markname'. |
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426 ORIGIN MARKED: markname (Xs) Matches if the origin has been marked with 'markname' within the past X seconds. |
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427 |
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428 Example usage: |
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429 |
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430 # This rule drops messages from sessions that have been marked as spammers in the past hour |
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431 ORIGIN MARKED: spammer (3600s) |
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432 DROP. |
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433 |
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434 # This rule marks the origin session as a spammer if they send a message to a honeypot JID |
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435 KIND: message |
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436 TO: honeypot@example.com |
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437 MARK ORIGIN=spammer |
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438 |
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439 Actions |
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440 ------- |
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442 Actions come after all conditions in a rule block. There must be at |
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443 least one action, though conditions are optional. |
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445 An action without parameters ends with a full-stop/period ('.'), and one |
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446 with parameters uses an equals sign ('='): |
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447 |
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448 # An action with no parameters: |
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449 DROP. |
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451 # An action with a parameter: |
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452 REPLY=Hello, this is a reply. |
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454 ### Route modification |
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455 |
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456 The most common actions modify the stanza's route in some way. Currently |
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457 the first matching rule to do so will halt further processing of actions |
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458 and rules (this may change in the future). |
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460 Action Description |
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461 ----------------------- --------------------------------------------------------------------------------------------------------------------------------------------------------- |
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462 `PASS.` Stop executing actions and rules on this stanza, and let it through this chain. |
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463 `DROP.` Stop executing actions and rules on this stanza, and discard it. |
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464 `REDIRECT=jid` Redirect the stanza to the given JID. |
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465 `REPLY=text` Reply to the stanza (assumed to be a message) with the given text. |
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466 `BOUNCE.` Bounce the stanza with the default error (usually service-unavailable) |
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467 `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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468 `BOUNCE=error (text)` As above, but include the supplied human-readable text with a description of the error |
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469 `COPY=jid` Make a copy of the stanza and send the copy to the specified JID. The copied stanza flows through Prosody's routing code, and as such is affected by firewall rules. Be careful to avoid loops. |
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470 |
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471 **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). |
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472 |
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473 ### Stanza modification |
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475 These actions make it possible to modify the content and structure of a |
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476 stanza. |
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478 Action Description |
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479 ------------------------ ------------------------------------------------------------------------ |
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480 `STRIP=name` Remove any child elements with the given name in the default namespace |
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481 `STRIP=name namespace` Remove any child elements with the given name and the given namespace |
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482 `INJECT=xml` Inject the given XML into the stanza as a child element |
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484 ### Sessions |
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485 |
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486 It is possible to mark sessions, and then use these marks to match rules later on. |
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487 |
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488 Action Description |
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489 ------------------------ -------------------------------------------------------------------------- |
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490 `MARK ORIGIN=mark` Marks the originating session with the given flag. |
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491 `UNMARK ORIGIN=mark` Removes the given mark from the origin session (if it is set). |
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492 |
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493 **Note:** Marks apply to sessions, not JIDs. E.g. if marking in a rule that matches a stanza received |
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494 over s2s, it is the s2s session that is marked. |
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495 |
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496 It is possible to have multiple marks on an origin at any given time. |
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497 |
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498 ### Informational |
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499 |
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500 Action Description |
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501 --------------- ------------------------------------------------------------------------------------------------------------------------ |
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502 `LOG=message` Logs the given message to Prosody's log file. Optionally prefix it with a log level in square brackets, e.g. `[debug]` |
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503 |
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504 You can include expressions in log messages, using `$(...)` syntax. For example, to log the stanza that matched the rule, you can use $(stanza), |
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505 or to log just the top tag of the stanza, use $(stanza:top_tag()). |
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506 |
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507 Example: |
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508 |
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509 # Log all stanzas to user@example.com: |
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510 TO: user@example.com |
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511 LOG=[debug] User received: $(stanza) |
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512 |
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513 More info about expressions can be found below. |
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514 |
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515 Chains |
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516 ------ |
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517 |
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518 Rules are grouped into "chains", which are injected at particular points in Prosody's routing code. |
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519 |
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520 Available chains are: |
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521 |
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522 Chain Description |
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523 -------------- ------------------------------------------------------------------------------------------- |
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524 deliver Applies to stanzas delivered to local recipients (regardless of the stanza's origin) |
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525 deliver_remote Applies to stanzas delivered to remote recipients (just before they leave the local server) |
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526 preroute Applies to incoming stanzas from local users, before any routing rules are applied |
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527 |
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528 A chain is begun by a line `::name` where 'name' is the name of the chain you want the following rules to be |
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529 inserted into. If no chain is specified, rules are put into the 'deliver' chain. |
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530 |
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531 It is possible to create custom chains (useful with the JUMP_CHAIN action described below). User-created |
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532 chains must begin with "user/", e.g. "user/spam_filtering". |
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533 |
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534 Example of chain use: |
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535 |
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536 # example.com's firewall script |
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537 |
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538 # This line is optional, because 'deliver' is the default chain anyway: |
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539 ::deliver |
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540 |
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541 # This rule matches any stanzas delivered to our local user bob: |
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542 TO: bob@example.com |
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543 DROP. |
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544 |
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545 # Oops! This rule will never match, because alice is not a local user, |
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546 # and only stanzas to local users go through the 'deliver' chain: |
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547 TO: alice@remote.example.com |
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548 DROP. |
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549 |
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550 # Create a 'preroute' chain of rules (matched for incoming stanzas from local clients): |
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551 ::preroute |
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552 # These rules are matched for outgoing stanzas from local clients |
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553 |
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554 # This will match any stanzas sent to alice from a local user: |
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555 TO: alice@remote.example.com |
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556 DROP. |
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557 |
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558 Action Description |
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559 ------------------------ ------------------------------------------------------------------------ |
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560 `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. |
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561 |
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562 It is possible to jump to chains defined by other scripts and modules. |
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563 |
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564 Expressions |
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565 ----------- |
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566 |
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567 Some conditions and actions in rules support "expressions" in their parameters (their documentation will indicate if this is the case). Most parameters |
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568 are static once the firewall script is loaded and compiled internally, however parameters that allow expressions can be dynamically calculated when a |
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569 rule is being run. |
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570 |
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571 There are two kinds of expression that you can use: stanza expressions, and code expressions. |
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572 |
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573 ### Stanza expressions |
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574 |
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575 Stanza expressions are of the form `$<...>`, where `...` is a stanza path. For syntax of stanza paths, see the documentation for the 'INSPECT' condition |
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576 above. |
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577 |
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578 Example: |
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579 |
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580 LOG=Matched a stanza from $<@from> to $<@to> |
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581 |
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582 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 |
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583 name. These functions are: |
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584 |
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585 Function Description |
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586 ------------ --------------------------------------- |
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587 bare Given a JID, strip any resource |
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588 node Return the node ('user part') of a JID |
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589 host Return the host ('domain') part of a JID |
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590 resource Return the resource part of a JID |
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591 |
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592 For example, to apply a rate limit to stanzas per sender domain: |
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593 |
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594 LIMIT normal on $<@from|domain> |
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595 |
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596 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 |
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597 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 |
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598 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: |
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599 |
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600 LOG=Stanza type is $<@type||"normal"> |
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601 |
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602 ### Code expressions |
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603 |
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604 Code expressions use `$(...)` syntax. Code expressions are powerful, and allow unconstrained access to Prosody's internal environment. Therefore |
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605 code expressions are typically for advanced use-cases only. You may want to refer to Prosody's [developer documentation](https://prosody.im/doc/developers) |
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606 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, |
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607 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. |
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608 |
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609 Example to limit stanzas per session type: |
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610 |
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611 LIMIT: normal on $(session.type) |
