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config:filter_files [2017/12/09 13:47]
digital man [Filter Exemption Files] Added link to default ipfilter_exempt.cfg
config:filter_files [2019/02/07 19:22]
digital man Mention that C-style escapes are now supported. More examples.
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 Filter configuration (''​[[dir:​ctrl]]/​*.cfg''​) and trash can (''​[[dir:​text]]/​*.can''​) files allow the sysop to specify words (or any sequence of characters) that will be used to disallow clients, users, or their content. Filter configuration (''​[[dir:​ctrl]]/​*.cfg''​) and trash can (''​[[dir:​text]]/​*.can''​) files allow the sysop to specify words (or any sequence of characters) that will be used to disallow clients, users, or their content.
  
-Each line in a filter file may contain a comparison sequence. ​ Blank lines and lines beginning with a semicolon are ignored+Each line in a filter file may contain a comparison sequence. ​ Blank lines and lines beginning with a semicolon are ignored.
  
 ===== Comparison Sequences ===== ===== Comparison Sequences =====
 +  * Leading white-space characters are ignored
   * Sequences of alphabetic letters are treated case-insensitively   * Sequences of alphabetic letters are treated case-insensitively
 +  * C-style string-literal backslash (''​\''​) [[wp>​C_syntax#​Strings|escape sequences]] are supported (as of v3.17c)
   * Sequences //​beginning//​ with an exclamation mark (''​!''​) negate the match logic for that sequence   * Sequences //​beginning//​ with an exclamation mark (''​!''​) negate the match logic for that sequence
   * Sequences //​beginning//​ with an asterisk (''​*''​) match only if the characters following the ''​*''​ are found at the end of the comparison string   * Sequences //​beginning//​ with an asterisk (''​*''​) match only if the characters following the ''​*''​ are found at the end of the comparison string
   * Sequences //ending// with an asterisk (''​*''​) or caret (''​^''​) match only if the characters preceding are found at the beginning of the comparison string   * Sequences //ending// with an asterisk (''​*''​) or caret (''​^''​) match only if the characters preceding are found at the beginning of the comparison string
-  * Sequences //ending// with a tilde (''​~''​) match only if the preceding characters are found anywhere within comparison string+  * Sequences //ending// with a tilde (''​~''​) match when the preceding ​string of characters are found //anywhere// within ​the comparison string
   * All other sequences are "exact match" string comparisons   * All other sequences are "exact match" string comparisons
    
-Examples+==== Examples ​==== 
   * ''​sysop''​ in the ''​name.can''​ file would mean users could not use the name "​sysop"​.   * ''​sysop''​ in the ''​name.can''​ file would mean users could not use the name "​sysop"​.
-  * ''​sysop*''​ would mean users could not use names beginning with the word "​sysop",​ like "sysopa" or "​sysops" ​etc+  * ''​sysop*''​ would mean users could not use names //beginning// with the word "​sysop",​ like "sysop the" or "​sysops"​. 
-  * ''​sysop~''​ would mean users could not use names that have the word "​sysop"​ anywhere in them, like "​imthesysop"​ or "mesysophere".+  * ''​sysop~''​ would mean users could not use names that have the word "​sysop" ​//anywhere// in them, like "​imthesysop"​ or "Joe Sysop".
  
-===== IPv4 CIDR Notation ​=====+=== Match strings with the character sequence "​viagra"​ anywhere within === 
 +  viagra~ 
 +   
 +=== Match strings beginning with the character sequence "​[adv]"​ === 
 +  [adv]* 
 + 
 +=== Match strings beginning with a space === 
 +  \ * 
 +   
 +=== Match the string "​administrator",​ exactly (but case-insensitively) === 
 +  administrator ​  
 +   
 +=== Match strings that do not begin with the character sequence: "the " === 
 +  !the * 
 + 
 +==== IPv4 CIDR Notation ====
  
 An additional comparison format was introduced in v3.17 (Feb-9-2017) specifically for partial (ranges of) IPv4 address matching following standard [[wp>​Classless_Inter-Domain_Routing]] (CIDR) notation. For example, rather than using the comparison string "​192.168.1.*"​ to match all IP addresses that begin with the first 3 octets of 192, 168, and 1, you could specify the same thing using CIDR notation: An additional comparison format was introduced in v3.17 (Feb-9-2017) specifically for partial (ranges of) IPv4 address matching following standard [[wp>​Classless_Inter-Domain_Routing]] (CIDR) notation. For example, rather than using the comparison string "​192.168.1.*"​ to match all IP addresses that begin with the first 3 octets of 192, 168, and 1, you could specify the same thing using CIDR notation:
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 IPv6 CIDR notation is not supported at this time. IPv6 CIDR notation is not supported at this time.
 + 
 ===== Trash Can Files ===== ===== Trash Can Files =====
  
 The following table lists the supported trash can files, a description of their use, and optional rejection message (''​.msg''​) files that may be displayed to users that are (or have their content) filtered. Trash can files and their respective optional rejection message files are located in the ''​[[dir:​text]]''​ directory: The following table lists the supported trash can files, a description of their use, and optional rejection message (''​.msg''​) files that may be displayed to users that are (or have their content) filtered. Trash can files and their respective optional rejection message files are located in the ''​[[dir:​text]]''​ directory:
  
-^Filename / Page     ​^Default Contents^Rejection Message^Description^+^Filename / Page     ​^Default Contents^Rejection Message((Rejection message files are only used/​displayed by the terminal server))^Description^
 |''​[[email.can]]'' ​  ​|[[http://​cvs.synchro.net/​cgi-bin/​viewcvs.cgi/​*checkout*/​text/​email.can|email.can]]|''​[[bademail.msg]]''​|Disallowed (source or destination) e-mail addresses (see also ''​[[twitlist.cfg]]''​)| |''​[[email.can]]'' ​  ​|[[http://​cvs.synchro.net/​cgi-bin/​viewcvs.cgi/​*checkout*/​text/​email.can|email.can]]|''​[[bademail.msg]]''​|Disallowed (source or destination) e-mail addresses (see also ''​[[twitlist.cfg]]''​)|
 |''​[[file.can]]'' ​  ​|[[http://​cvs.synchro.net/​cgi-bin/​viewcvs.cgi/​*checkout*/​text/​file.can|file.can]]|''​[[badfile.msg]]''​|Disallowed filenames for upload| |''​[[file.can]]'' ​  ​|[[http://​cvs.synchro.net/​cgi-bin/​viewcvs.cgi/​*checkout*/​text/​file.can|file.can]]|''​[[badfile.msg]]''​|Disallowed filenames for upload|
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   * [[:​config:​|Configuration]]   * [[:​config:​|Configuration]]
  
-{{tag>​filter abuse}}+{{tag>​filter abuse spam}}
  

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