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<!DOCTYPE erlref SYSTEM "erlref.dtd">

<erlref>
  <header>
    <copyright>
      <year>1998</year><year>2016</year>
      <holder>Ericsson AB. All Rights Reserved.</holder>
    </copyright>
    <legalnotice>
      Licensed under the Apache License, Version 2.0 (the "License");
      you may not use this file except in compliance with the License.
      You may obtain a copy of the License at
 
          http://www.apache.org/licenses/LICENSE-2.0

      Unless required by applicable law or agreed to in writing, software
      distributed under the License is distributed on an "AS IS" BASIS,
      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      See the License for the specific language governing permissions and
      limitations under the License.

    </legalnotice>

    <title>mod_security</title>
    <prepared>Mattias Nilsson</prepared>
    <docno></docno>
    <date>1997-11-18</date>
    <rev>1.0</rev>
    <file>mod_security.sgml</file>
  </header>
  <module>mod_security</module>
  <modulesummary>Security Audit and Trailing Functionality</modulesummary>
  <description>
    <p>Security Audit and Trailing Functionality</p>
  </description>
  <funcs>

      <func>
      <name>block_user(User, Port, Dir, Seconds) -> true | {error, Reason}</name>
      <name>block_user(User, Address, Port, Dir, Seconds) -> true | {error, Reason}</name>
      <fsummary>Blocks a user from access to a directory for a certain amount of time.</fsummary>
      <type>
        <v>User = string()</v>
        <v>Port = integer()</v>
        <v>Address = {A,B,C,D} | string() | undefined</v>
        <v>Dir = string()</v>
        <v>Seconds = integer() | infinity</v>
        <v>Reason = no_such_directory</v>
      </type>
      <desc>
        <p><c>block_user/4</c> and <c>block_user/5</c> each blocks the user 
          <c>User</c> from directory <c>Dir</c> for a specified 
          amount of time.</p>
      </desc>
    </func>
    
    <func>
      <name>list_auth_users(Port) -> Users | []</name>
      <name>list_auth_users(Address, Port) -> Users | []</name>
      <name>list_auth_users(Port, Dir) -> Users | []</name>
      <name>list_auth_users(Address, Port, Dir) -> Users | []</name>
      <fsummary>Lists users that have authenticated within the <c>SecurityAuthTimeout</c> 
      time for a given address (if specified), port number, and directory 
      (if specified).</fsummary>
      <type>
        <v>Port = integer()</v>
        <v>Address = {A,B,C,D} | string() | undefined</v>
        <v>Dir = string()</v>
        <v>Users = list() = [string()]</v>
      </type>
      <desc>
        <p><c>list_auth_users/1</c>, <c>list_auth_users/2</c>, and 
          <c>list_auth_users/3</c> each returns a list of users that are 
          currently authenticated. Authentications are stored for
          <c>SecurityAuthTimeout</c> seconds, and then discarded.</p>
      </desc>
    </func>
    <func>
      <name>list_blocked_users(Port) -> Users | []</name>
      <name>list_blocked_users(Address, Port) -> Users | []</name>
      <name>list_blocked_users(Port, Dir) -> Users | []</name>
      <name>list_blocked_users(Address, Port, Dir) -> Users | []</name>
      <fsummary>Lists users that are currently blocked from access to a 
      specified port number, for a given address (if specified).</fsummary>
      <type>
        <v>Port = integer()</v>
        <v>Address = {A,B,C,D} | string() | undefined</v>
        <v>Dir = string()</v>
        <v>Users = list() = [string()]</v>
      </type>
      <desc>
        <p><c>list_blocked_users/1</c>, <c>list_blocked_users/2</c>, and 
          <c>list_blocked_users/3</c> each returns a list of users that are 
          currently blocked from access.</p>
      </desc>
    </func>
  
    <func>
      <name>unblock_user(User, Port) -> true | {error, Reason}</name>
      <name>unblock_user(User, Address, Port) -> true | {error, Reason}</name>
      <name>unblock_user(User, Port, Dir) -> true | {error, Reason}</name>
      <name>unblock_user(User, Address, Port, Dir) -> true | {error, Reason}</name>
      <fsummary>Removes a blocked user from the block list.</fsummary>
      <type>
        <v>User = string()</v>
        <v>Port = integer()</v>
        <v>Address = {A,B,C,D} | string() | undefined</v>
        <v>Dir = string()</v>
        <v>Reason = term()</v>
      </type>
      <desc>
        <p><c>unblock_user/2</c>, <c>unblock_user/3</c>, and 
          <c>unblock_user/4</c> each removes the user <c>User</c> from 
          the list of blocked users for <c>Port</c> (and <c>Dir</c>).</p>
      </desc>
    </func>
  </funcs>

  <section>
    <marker id="callback_module"></marker>
    <title>SecurityCallbackModule</title>
    <p>The <c>SecurityCallbackModule</c> is a user-written module that can receive 
      events from the <c>mod_security</c> Erlang web server API module. 
      This module only exports the functions event/[4,5]
      which are described here.
      </p>
  </section>

  <funcs>
    <func>
      <name>Module:event(What, Port, Dir, Data) -> ignored</name>
      <name>Module:event(What, Address, Port, Dir, Data) -> ignored</name>
      <fsummary>Called whenever an event occurs in <c>mod_security</c>.</fsummary>
      <type>
        <v>What = atom()</v>
        <v>Port = integer()</v>
        <v>Address = {A,B,C,D} | string() &lt;v>Dir   = string()</v>
        <v>Data = [Info]</v>
        <v>Info = {Name, Value}</v>
      </type>
      <desc>
        <marker id="callback_module_event"></marker>
        <p><c>event/4</c> or <c>event/5</c> is called whenever an event 
          occurs in the <c>mod_security</c> Erlang web server API module.
	  (<c>event/4</c> is called if <c>Address</c> is undefined, 
	  otherwise <c>event/5</c>. 
          Argument <c>What</c> specifies the type of event that has 
          occurred and is one of the following reasons:
          </p>
	  <taglist>
       <tag><c>auth_fail</c></tag>
       <item><p>A failed user authentication.</p></item>
       <tag><c>user_block</c></tag>
       <item><p>A user is being blocked from access.</p></item>
       <tag><c>user_unblock</c></tag>
       <item><p>A user is being removed from the block list.</p></item>
     </taglist>
        <note>
          <p>The event <c>user_unblock</c> is not triggered when 
            a user is removed from the block list explicitly using the 
            <c>unblock_user</c> function.</p>
        </note>
      </desc>
    </func>
  </funcs>
  
</erlref>


