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annotate mod_firewall/scripts/spam-blocking.pfw @ 5531:af2778f4ee29

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mod_firewall: scripts: spam-blocking.pfw: Add special handling for MUC invites
author Matthew Wild <mwild1@gmail.com>
date Thu, 08 Jun 2023 11:28:56 +0100
parents bb60db2b2cd1
children 09311a8a3cfa
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1 #### Anti-spam ruleset ###########################################
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2 #
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3 # This script provides some foundational anti-spam rules. It aims
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4 # to PASS stanzas that are definitely not spam, and DROP stanzas
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5 # that are very likely spam.
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6 #
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7 # It does not do any form of content filtering,
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8 # but this can be implemented by other scripts and
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9 # modules as desired using the chains documented below.
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10 #
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11 #
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12 # The following chains are available as extension
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13 # points:
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14 #
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15 # ::user/spam_check_custom
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16 # Apply additional rules to all stanzas before they are checked.
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17 # Mainly useful to PASS stanzas that you do not want to be
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18 # filtered.
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19 #
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20 # ::user/spam_check_message_custom
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21 # Apply additional rules to messages from strangers, aiming to
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22 # PASS stanzas that are not spam and jump to ::user/spam_reject
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23 # for stanzas that are considered spam.
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24 #
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25 # ::user/spam_check_message_content_custom
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26 # Apply additional rules to messages that may be spam, based on
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27 # message content rules. These may contain more intensive rules,
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28 # so are executed after all other checks. Rules should jump to
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29 # ::user/spam_reject if a message is considered spam.
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30 #
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31 # ::user/spam_check_presence_custom
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32 # Apply additional rules to presence that may be spam.
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33 #
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34 # ::user/spam_check_subscription_request_custom
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35 # Apply additional rules to subscription requests.
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36 #
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37 # ::user/spam_handle_unknown_custom
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38 # Override default handling of stanzas that weren't explicitly
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39 # passed or rejected by the anti-spam checks.
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40 #
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41 # ::user/spam_reject_custom
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42 # Override default handling of stanzas that have
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43 # been recognised as spam (default is to bounce
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44 # a policy-violation error).
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45 #
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46 ##################################################################
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47
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48 #### Entry point for all incoming stanzas ########################
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49 ::deliver
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50
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51 # Override this if you want to prevent certain stanzas going through
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52 # the normal spam_check chain
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53 JUMP_CHAIN=user/spam_check_custom
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54
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55 # Run the default spam_check chain
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56 JUMP_CHAIN=user/spam_check
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57
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58 ##################################################################
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59
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60 #### General spam-checking rules (all stanzas) ###################
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61 ::user/spam_check
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62
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63 # Pass stanzas that a user sends to their own account
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64 TO SELF?
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65 PASS.
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66
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67 # Pass stanzas that are addressed to a valid full JID
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68 TO FULL JID?
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69 PASS.
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70
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71 # Pass stanzas from contacts
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72 SUBSCRIBED?
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73 PASS.
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74
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75 # Run extra rules that apply to messages only
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76 KIND: message
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77 JUMP CHAIN=user/spam_check_message
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78
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79 # Run extra rules that apply to presence stanzas only
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80 KIND: presence
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81 JUMP CHAIN=user/spam_check_presence
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82
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83 JUMP CHAIN=user/spam_handle_unknown
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84
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85 # Default is to allow, override this with
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86 # the 'user/spam_handle_unknown' chain
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87 PASS.
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88
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89 #### Rules for messages ##########################################
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90 ::user/spam_check_message
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92 JUMP CHAIN=user/spam_check_message_custom
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93
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94 # Type 'groupchat' messages addressed to an offline full JID are harmless,
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95 # and should be routed normally to handle MUC 'ghosts' correctly
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96 TO: <*>@<*>/<*>
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97 TYPE: groupchat
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98 PASS.
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99
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100 # Mediated MUC invitations are naturally from 'strangers' and have special
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101 # handling. We lean towards accepting them, unless overridden by custom rules.
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102 NOT FROM FULL JID?
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103 NOT INSPECT: body
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104 INSPECT: {http://jabber.org/protocol/muc#user}x/invite
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105 JUMP CHAIN=user/spam_check_muc_invite
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106
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107 # Non-chat message types often generate pop-ups in clients,
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108 # so we won't accept them from strangers
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109 NOT TYPE: chat
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110 JUMP CHAIN=user/spam_reject
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112 JUMP CHAIN=user/spam_check_message_content
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113
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114 # This chain can be used by other scripts
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115 # and modules that analyze message content
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116 JUMP CHAIN=user/spam_check_message_content_custom
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117
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118 ##################################################################
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119
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120 #### Rules for presence stanzas ##################################
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121 ::user/spam_check_presence
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123 JUMP CHAIN=user/spam_check_presence_custom
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124
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125 # Presence to offline full JIDs is harmless, and should be routed
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126 # normally to handle MUC 'ghosts' correctly
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127 TO: <*>@<*>/<*>
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128 PASS.
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129
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130 # These may be received if rosters get out of sync and are harmless
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131 # because they will not be routed to the client unless necessary
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132 TYPE: unsubscribe|unsubscribed
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133 PASS.
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134
2556
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135 # We don't want to receive presence from random strangers,
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136 # but still allow subscription requests
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137 NOT TYPE: subscribe|subscribed
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138 DROP.
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139
cc01a5bfcf3b mod_firewall: spam-blocking.pfw, initial anti-spam ruleset
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140 # This chain can be used by other scripts
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141 # and modules to filter subscription requests
2565
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142 JUMP CHAIN=user/spam_check_subscription_request
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143
4149
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144 JUMP CHAIN=user/spam_check_subscription_request_custom
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145
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146 ##################################################################
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147
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148 #### Rules for MUC invitations ###################################
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149
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150 ::user/spam_check_muc_invite
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151
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152 # This chain can be used to inspect the invitation and determine
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153 # the appropriate action. Otherwise, we proceed with the default
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154 # action below.
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155 JUMP CHAIN=user/spam_check_muc_invite_custom
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156
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157 # Allow mediated MUC invitations by default
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158 PASS.
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159
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160 #### Stanzas reaching this chain will be rejected ################
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161 ::user/spam_reject
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162
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163 # This chain can be used by other scripts
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164 # and modules to override the default behaviour
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165 # when rejecting spam stanzas
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166 JUMP CHAIN=user/spam_reject_custom
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167
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168 LOG=Rejecting suspected spam: $(stanza:top_tag())
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169 BOUNCE=policy-violation
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170
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171 ##################################################################
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172
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173 #### Stanzas that may be spam, but we're not sure either way #####
2565
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174 ::user/spam_handle_unknown
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175
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176 # This chain can be used by other scripts
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177 # and modules to apply additional checks, or to
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178 # override the default behaviour
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179 JUMP CHAIN=user/spam_handle_unknown_custom
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180
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181 #LOG=[debug] Spam check allowing: $(stanza:top_tag())
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182
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183 ##################################################################