/ 
Mail-SpamAssassin-4.0.1-rc1d-TRIAL
River stage two • 13 direct dependents • 18 total dependents
/ Mail::SpamAssassin::Plugin::HashBL

NAME

HashBL - query hashed (and unhashed) DNS blocklists

SYNOPSIS

loadplugin Mail::SpamAssassin::Plugin::HashBL

# NON-WORKING usage examples below, replace xxx.example.invalid with real list
# See documentation below for detailed usage

header   HASHBL_EMAIL eval:check_hashbl_emails('ebl.example.invalid')
describe HASHBL_EMAIL Message contains email address found on EBL
tflags   HASHBL_EMAIL net

# rewrite googlemail.com -> gmail.com, applied before acl/welcomelist
hashbl_email_domain_alias gmail.com googlemail.com
# only query gmail.com addresses
hashbl_acl_freemail gmail.com
header   HASHBL_OSENDR eval:check_hashbl_emails('rbl.example.invalid/A', 'md5/max=10/shuffle', 'X-Original-Sender', '^127\.', 'freemail')
describe HASHBL_OSENDR Message contains email address found on HASHBL
tflags   HASHBL_OSENDR net

body     HASHBL_BTC eval:check_hashbl_bodyre('btcbl.example.invalid', 'sha1/max=10/shuffle', '\b([13][a-km-zA-HJ-NP-Z1-9]{25,34})\b')
describe HASHBL_BTC Message contains BTC address found on BTCBL
tflags   HASHBL_BTC net

header   HASHBL_URI eval:check_hashbl_uris('rbl.example.invalid', 'sha1', '^127\.0\.0\.32$')
describe HASHBL_URI Message contains uri found on rbl
tflags   HASHBL_URI net

body     HASHBL_ATTACHMENT eval:check_hashbl_attachments('attbl.example.invalid', 'sha256')
describe HASHBL_ATTACHMENT Message contains attachment found on attbl
tflags   HASHBL_ATTACHMENT net

# Capture tag using SA 4.0 regex named capture feature
header   __X_SOME_ID X-Some-ID =~ /^(?<XSOMEID>\d{10,20})$/
# Query the tag value as is from a DNSBL
header   HASHBL_TAG eval:check_hashbl_tag('idbl.example.invalid/A', 'raw', 'XSOMEID', '^127\.')

DESCRIPTION

This plugin supports multiple types of hashed or unhashed DNS blocklist queries.

Common OPTS that apply to all functions:
raw      no hashing, query as is (can break if value is not valid DNS label)
md5      hash query with MD5
sha1     hash query with SHA1
sha256   hash query with Base32 encoded SHA256
case     keep case before hashing, default is to lowercase
max=x	   maximum number of queries (defaults to 10 if not specified)
shuffle  if max exceeded, random shuffle queries before truncating to limit

Multiple options can be separated with slash.

When rule OPTS is empty ('') or missing, default is used as documented by each query type. If any options are defined, then all needed options must be explicitly defined.

header RULE check_hashbl_emails('bl.example.invalid/A', 'OPTS', 'HEADERS', '^127\.')

Check email addresses from DNS list. Note that "body" can be specified along with headers to search message body for emails. Rule type must always be "header".

Optional DNS query type can be appended to list with /A (default) or /TXT.

Default OPTS: sha1/notag/noquote/max=10/shuffle

Additional supported OPTS:

nodot    strip username dots from email
notag    strip username tags from email
nouri    ignore emails inside uris
noquote  ignore emails inside < > or possible quotings
user     query userpart of email only
host     query hostpart of email only
domain   query domain of email only (hostpart+trim_domain)

Default HEADERS: ALLFROM/Reply-To/body

HEADERS refers to slash separated list of Headers to process:

ALL           all headers
ALLFROM       all From headers as returned by $pms->all_from_addrs()
EnvelopeFrom  message envelope from (Return-Path etc)
<HeaderName>  any header as used with header rules or $pms->get()
body          all emails found in message body

If HEADERS is empty ('') or missing, default is used.

Optional subtest regexp to match DNS answer (default: '^127\.').

For existing public email blocklist, see: http://msbl.org/ebl.html

# Working example, see https://msbl.org/ebl.html before usage
header   HASHBL_EMAIL eval:check_hashbl_emails('ebl.msbl.org')
describe HASHBL_EMAIL Message contains email address found on EBL
tflags   HASHBL_EMAIL net

Default regex for matching and capturing emails can be overridden with hashbl_email_regex. Likewise, the default welcomelist can be changed with hashbl_email_welcomelist. Only change if you know what you are doing, see plugin source code for the defaults. Example: hashbl_email_regex \S+@\S+.com

header RULE check_hashbl_uris('bl.example.invalid/A', 'OPTS', '^127\.')

Check all URIs parsed from message from DNS list.

Optional DNS query type can be appended to list with /A (default) or /TXT.

Default OPTS: sha1/max=10/shuffle

Optional subtest regexp to match DNS answer (default: '^127\.').

[raw]body RULE check_hashbl_bodyre('bl.example.invalid/A', 'OPTS', '\b(match)\b', '^127\.')

Search body for matching regexp and query the string captured. Regexp must have a single capture ( ) for the string ($1). Rule type must be "body" or "rawbody".

Optional DNS query type can be appended to list with /A (default) or /TXT.

Default OPTS: sha1/max=10/shuffle

Additional supported OPTS:

num      remove the chars from the match that are not numbers

Optional subtest regexp to match DNS answer (default: '^127\.').

header RULE check_hashbl_tag('bl.example.invalid/A', 'OPTS', 'TAGNAME', '^127\.')

Query value of SpamAssassin tag _TAGNAME_ from DNS list.

Optional DNS query type can be appended to list with /A (default) or /TXT.

Default OPTS: sha1/max=10/shuffle

Additional supported OPTS:

ip        only query if value is valid IPv4/IPv6 address
ipv4      only query if value is valid IPv4 address
ipv6      only query if value is valid IPv6 address
revip     reverse IP before query
fqdn      only query if value is valid FQDN (is_fqdn_valid)
tld       only query if value has valid TLD (is_domain_valid)
trim      trim name from hostname to domain (trim_domain)

If both ip/ipv4/ipv6 and fqdn/tld are enabled, only either of them is
required to match.  Both fqdn and tld are needed for complete FQDN+TLD
check.

Optional subtest regexp to match DNS answer (default: '^127\.').

header RULE check_hashbl_attachments('bl.example.invalid/A', 'OPTS', '^127\.')

Check all all message attachments (mimeparts) from DNS list.

Optional DNS query type can be appended to list with /A (default) or /TXT.

Default OPTS: sha1/max=10/shuffle

Additional supported OPTS:

minsize=x  skip any parts smaller than x bytes
maxsize=x  skip any parts larger than x bytes

Optional subtest regexp to match DNS answer (default: '^127\.').

Specific attachment filenames can be skipped with hashbl_ignore. For example "hashbl_ignore safe.pdf".

Specific mime types can be skipped with hashbl_ignore. For example "hashbl_ignore text/plain".

hashbl_ignore value [value...]

Skip any type of query, if either the hash or original value (email for example) matches. Multiple values can be defined, separated by whitespace. Matching is case-insensitive.

Any host or its domain part matching uridnsbl_skip_domains is also ignored by default.