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Table of Contents
Filter Files
Filter configuration (ctrl/*.cfg) and trash can (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
Comparison Sequences
- Sequences of alphabetic letters are treated case-insensitively
- 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 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 - All other sequences are “exact match” string comparisons
Examples:
sysopin thename.canfile 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 that have the word “sysop” anywhere in them, like “imthesysop” or “mesysophere”.
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 text directory:
| Filename / Page | Default Contents | Rejection Message | Description |
|---|---|---|---|
email.can | email.can | bademail.msg | Disallowed (source or destination) e-mail addresses (see also twitlist.cfg) |
file.can | file.can | badfile.msg | Disallowed filenames for upload |
host.can | host.can | badhost.msg | Disallowed hostnames for inbound connections (when hostname lookups are enabled) |
ip.can | ip.can | badip.msg | Disallowed IP addresses for inbound connections |
ip-silent.can | ip-silent.can | Silently-ignored IP addresses for inbound connections | |
name.can | name.can | badname.msg | Disallowed user login name/alias (see also block-hackers) |
password.can | password.can | badpassword.msg | Disallowed user passwords |
phone.can | phone.can | badphone.msg | Disallowed phone numbers for new users |
subject.can | subject.can | badsubject.msg | Disallowed subjects in posted messages |
Other Filter Files
The following table lists other supported filter files and a description of their use. These filter files are located in the ctrl directory and do not have a respective response message file:
| Filename / Page | Default Contents | Description |
|---|---|---|
spamblock.cfg | spamblock.cfg | Hostnames and IP addresses blocked from sending e-mail to the Mail Server (see also spamblock_exempt.cfg) |
twitlist.cfg | twitlist.cfg | Disallowed (source or destination) e-mail addresses (enclosed in <angle brackets>) or names (see also email.can) |
Filter Exemption Files
The following table lists supported filter exemption files and a description of their use. These filter exemption files are located in the ctrl directory:
| Filename / Page | Default Contents | Description |
|---|---|---|
ipfilter_exempt.cfg | Hostnames and IP addresses that are considered exempt from temporary bans and permanent filtering (added Oct-17-2016) | |
dnsbl_exempt.cfg | dnsbl_exempt.cfg | Hostnames and IP addresses and e-mail address (enclosed in <angle brackets>) which are to be exempt from positive DNS-based Blacklist results in the Mail Server (see also dns_blacklist.cfg) |
spamblock_exempt.cfg | spamblock_exempt.cfg | Hostnames and IP addresses which are not to be blocked from sending e-mail to the Mail Server (see also spamblock.cfg) |
