xref: /src/external/ibm-public/postfix/dist/conf/header_checks

# HEADER_CHECKS(5)                                              HEADER_CHECKS(5)
# 
# NAME
#        header_checks - Postfix built-in content inspection
# 
# SYNOPSIS
#        header_checks = pcre:/etc/postfix/header_checks
#        mime_header_checks = pcre:/etc/postfix/mime_header_checks
#        nested_header_checks = pcre:/etc/postfix/nested_header_checks
#        body_checks = pcre:/etc/postfix/body_checks
# 
#        milter_header_checks = pcre:/etc/postfix/milter_header_checks
# 
#        smtp_header_checks = pcre:/etc/postfix/smtp_header_checks
#        smtp_mime_header_checks = pcre:/etc/postfix/smtp_mime_header_checks
#        smtp_nested_header_checks = pcre:/etc/postfix/smtp_nested_header_checks
#        smtp_body_checks = pcre:/etc/postfix/smtp_body_checks
# 
#        postmap -q "string" pcre:/etc/postfix/filename
#        postmap -q - pcre:/etc/postfix/filename <inputfile
# 
# DESCRIPTION
#        This  document  describes access control on the content of
#        message headers and message body lines; it is  implemented
#        by  the  Postfix  cleanup(8) server before mail is queued.
#        See access(5) for access control  on  remote  SMTP  client
#        information.
# 
#        Each  message  header  or  message  body  line is compared
#        against a list of patterns.  When a  match  is  found  the
#        corresponding action is executed, and the matching process
#        is repeated for the next message header  or  message  body
#        line.
# 
#        Note: message headers are examined one logical header at a
#        time, even when a message  header  spans  multiple  lines.
#        Body lines are always examined one line at a time.
# 
#        For  examples, see the EXAMPLES section at the end of this
#        manual page.
# 
#        Postfix header or body_checks are designed to stop a flood
#        of  mail from worms or viruses; they do not decode attach-
#        ments, and they do not unzip archives. See  the  documents
#        referenced  below  in the README FILES section if you need
#        more sophisticated content analysis.
# 
# FILTERS WHILE RECEIVING MAIL
#        Postfix implements the  following  four  built-in  content
#        inspection classes while receiving mail:
# 
#        header_checks (default: empty)
#               These   are  applied  to  initial  message  headers
#               (except for the headers  that  are  processed  with
#               mime_header_checks).
# 
#        mime_header_checks (default: $header_checks)
#               These  are  applied to MIME related message headers
#               only.
# 
#               This feature is available in Postfix 2.0 and later.
# 
#        nested_header_checks (default: $header_checks)
#               These  are  applied  to message headers of attached
#               email messages (except for  the  headers  that  are
#               processed with mime_header_checks).
# 
#               This feature is available in Postfix 2.0 and later.
# 
#        body_checks
#               These are applied to all other  content,  including
#               multi-part message boundaries.
# 
#               With Postfix versions before 2.0, all content after
#               the initial message headers is treated as body con-
#               tent.
# 
# FILTERS AFTER RECEIVING MAIL
#        Postfix  supports a subset of the built-in content inspec-
#        tion classes after the message is received:
# 
#        milter_header_checks (default: empty)
#               These are applied to headers that  are  added  with
#               Milter applications.
# 
#               This feature is available in Postfix 2.7 and later.
# 
# FILTERS WHILE DELIVERING MAIL
#        Postfix supports all four content inspection classes while
#        delivering mail via SMTP.
# 
#        smtp_header_checks (default: empty)
# 
#        smtp_mime_header_checks (default: empty)
# 
#        smtp_nested_header_checks (default: empty)
# 
#        smtp_body_checks (default: empty)
#               These  features  are  available  in Postfix 2.5 and
#               later.
# 
# COMPATIBILITY
#        With Postfix version 2.2 and earlier specify "postmap -fq"
#        to query a table that contains case sensitive patterns. By
#        default, regexp: and pcre: patterns are case  insensitive.
# 
# TABLE FORMAT
#        This  document  assumes  that header and body_checks rules
#        are specified in the form of  Postfix  regular  expression
#        lookup  tables.  Usually  the best performance is obtained
#        with pcre (Perl Compatible Regular Expression) tables. The
#        regexp  (POSIX  regular  expressions)  tables  are usually
#        slower, but more widely available.  Use the command "post-
#        conf  -m" to find out what lookup table types your Postfix
#        system supports.
# 
#        The general format of Postfix regular expression tables is
#        given  below.   For  a  discussion  of specific pattern or
#        flags  syntax,  see  pcre_table(5)   or   regexp_table(5),
#        respectively.
# 
#        /pattern/flags action
#               When  /pattern/  matches  the input string, execute
#               the corresponding action. See below for a  list  of
#               possible actions.
# 
#        !/pattern/flags action
#               When  /pattern/  does  not  match the input string,
#               execute the corresponding action.
# 
#        if /pattern/flags
# 
#        endif  If the input string matches /pattern/,  then  match
#               that  input  string against the patterns between if
#               and endif.  The if..endif can nest.
# 
#               Note: do not prepend whitespace to patterns  inside
#               if..endif.
# 
#        if !/pattern/flags
# 
#        endif  If  the input string does not match /pattern/, then
#               match  that  input  string  against  the   patterns
#               between if and endif. The if..endif can nest.
# 
#        blank lines and comments
#               Empty  lines and whitespace-only lines are ignored,
#               as are lines whose first  non-whitespace  character
#               is a `#'.
# 
#        multi-line text
#               A  pattern/action  line  starts with non-whitespace
#               text. A line that starts with whitespace  continues
#               a logical line.
# 
# TABLE SEARCH ORDER
#        For  each  line of message input, the patterns are applied
#        in the order as specified in the table. When a pattern  is
#        found  that  matches  the  input  line,  the corresponding
#        action is  executed  and  then  the  next  input  line  is
#        inspected.
# 
# TEXT SUBSTITUTION
#        Substitution  of  substrings  from  the matched expression
#        into the action string is possible using the  conventional
#        Perl  syntax  ($1,  $2,  etc.).   The macros in the result
#        string may need to be written as  ${n}  or  $(n)  if  they
#        aren't followed by whitespace.
# 
#        Note:  since negated patterns (those preceded by !) return
#        a result when the expression does not match, substitutions
#        are not available for negated patterns.
# 
# ACTIONS
#        Action names are case insensitive. They are shown in upper
#        case for consistency with other Postfix documentation.
# 
#        BCC user@domain
#               Add the specified address as a BCC  recipient,  and
#               inspect  the next input line. The address must have
#               a local part and domain part.  The  number  of  BCC
#               addresses  that can be added is limited only by the
#               amount of available storage space.
# 
#               Note 1: the BCC address is added as if it was spec-
#               ified  with  NOTIFY=NONE.  The  sender  will not be
#               notified when the BCC address is undeliverable,  as
#               long  as  all  down-stream  software implements RFC
#               3461.
# 
#               Note 2: this ignores duplicate addresses (with  the
#               same delivery status notification options).
# 
#               This feature is available in Postfix 3.0 and later.
# 
#               This feature is not supported with smtp header/body
#               checks.
# 
#        DISCARD optional text...
#               Claim  successful delivery and silently discard the
#               message.  Do not inspect the remainder of the input
#               message.   Log the optional text if specified, oth-
#               erwise log a generic message.
# 
#               Note:  this  action  disables  further  header   or
#               body_checks  inspection  of the current message and
#               affects all recipients.  To discard only one recip-
#               ient without discarding the entire message, use the
#               transport(5) table to direct mail to the discard(8)
#               service.
# 
#               This feature is available in Postfix 2.0 and later.
# 
#               This feature is not supported with smtp header/body
#               checks.
# 
#        DUNNO  Pretend  that the input line did not match any pat-
#               tern, and inspect the next input line. This  action
#               can be used to shorten the table search.
# 
#               For  backwards  compatibility reasons, Postfix also
#               accepts OK but it is (and always has been)  treated
#               as DUNNO.
# 
#               This feature is available in Postfix 2.1 and later.
# 
#        FILTER transport:destination
#               Override the content_filter parameter setting,  and
#               inspect  the next input line.  After the message is
#               queued, send the entire message through the  speci-
#               fied  external  content  filter. The transport name
#               specifies the first field of a mail delivery  agent
#               definition in master.cf; the syntax of the next-hop
#               destination is described in the manual page of  the
#               corresponding  delivery  agent.   More  information
#               about external content filters is  in  the  Postfix
#               FILTER_README file.
# 
#               Note  1: do not use $number regular expression sub-
#               stitutions for transport or destination unless  you
#               know that the information has a trusted origin.
# 
#               Note  2:  this  action  overrides  the main.cf con-
#               tent_filter setting, and affects all recipients  of
#               the  message.  In  the  case  that  multiple FILTER
#               actions fire, only the last one is executed.
# 
#               Note 3: the purpose of the  FILTER  command  is  to
#               override  message routing.  To override the recipi-
#               ent's transport but not the  next-hop  destination,
#               specify  an  empty  filter destination (Postfix 2.7
#               and later), or specify a transport:destination that
#               delivers   through  a  different  Postfix  instance
#               (Postfix 2.6 and earlier). Other options are  using
#               the  recipient-dependent transport_maps or the sen-
#               der-dependent   sender_dependent_default_transport-
#               _maps features.
# 
#               This feature is available in Postfix 2.0 and later.
# 
#               This feature is not supported with smtp header/body
#               checks.
# 
#        HOLD optional text...
#               Arrange  for  the  message to be placed on the hold
#               queue, and inspect the next input line.   The  mes-
#               sage  remains  on hold until someone either deletes
#               it or releases it for delivery.  Log  the  optional
#               text if specified, otherwise log a generic message.
# 
#               Mail that is placed on hold can  be  examined  with
#               the  postcat(1)  command,  and  can be destroyed or
#               released with the postsuper(1) command.
# 
#               Note: use "postsuper -r" to release mail  that  was
#               kept  on  hold for a significant fraction of $maxi-
#               mal_queue_lifetime  or  $bounce_queue_lifetime,  or
#               longer.  Use "postsuper -H" only for mail that will
#               not expire within a few delivery attempts.
# 
#               Note: this action affects  all  recipients  of  the
#               message.
# 
#               This feature is available in Postfix 2.0 and later.
# 
#               This feature is not supported with smtp header/body
#               checks.
# 
#        IGNORE Delete the current line from the input, and inspect
#               the next input line.
# 
#        INFO optional text...
#               Log an "info:" record with the optional text... (or
#               log  a  generic  text),  and inspect the next input
#               line. This action is useful for routine logging  or
#               for debugging.
# 
#               This feature is available in Postfix 2.8 and later.
# 
#        PREPEND text...
#               Prepend one  line  with  the  specified  text,  and
#               inspect the next input line.
# 
#               Notes:
# 
#               o      The  prepended  text is output on a separate
#                      line,  immediately  before  the  input  that
#                      triggered the PREPEND action.
# 
#               o      The prepended text is not considered part of
#                      the input  stream:  it  is  not  subject  to
#                      header/body checks or address rewriting, and
#                      it does not affect the way that Postfix adds
#                      missing message headers.
# 
#               o      When prepending text before a message header
#                      line, the prepended text must begin  with  a
#                      valid message header label.
# 
#               o      This   action  cannot  be  used  to  prepend
#                      multi-line text.
# 
#               This feature is available in Postfix 2.1 and later.
# 
#               This   feature   is   not   supported   with   mil-
#               ter_header_checks.
# 
#        REDIRECT user@domain
#               Write a message redirection request  to  the  queue
#               file,  and  inspect  the next input line. After the
#               message is queued, it will be sent to the specified
#               address instead of the intended recipient(s).
# 
#               Note:  this action overrides the FILTER action, and
#               affects all recipients of the message. If  multiple
#               REDIRECT  actions  fire,  only the last one is exe-
#               cuted.
# 
#               This feature is available in Postfix 2.1 and later.
# 
#               This feature is not supported with smtp header/body
#               checks.
# 
#        REPLACE text...
#               Replace the current line with the  specified  text,
#               and inspect the next input line.
# 
#               This feature is available in Postfix 2.2 and later.
#               The description below applies to Postfix 2.2.2  and
#               later.
# 
#               Notes:
# 
#               o      When  replacing  a  message header line, the
#                      replacement text must  begin  with  a  valid
#                      header label.
# 
#               o      The  replaced text remains part of the input
#                      stream. Unlike the result from  the  PREPEND
#                      action,  a  replaced  message  header may be
#                      subject to address rewriting and may  affect
#                      the  way  that  Postfix adds missing message
#                      headers.
# 
#        REJECT optional text...
#               Reject the  entire  message.  Do  not  inspect  the
#               remainder   of   the  input  message.   Reply  with
#               optional text... when the optional text  is  speci-
#               fied, otherwise reply with a generic error message.
# 
#               Note:  this  action  disables  further  header   or
#               body_checks  inspection  of the current message and
#               affects all recipients.
# 
#               Postfix version 2.3 and later support enhanced sta-
#               tus codes.  When no code is specified at the begin-
#               ning of optional text..., Postfix inserts a default
#               enhanced status code of "5.7.1".
# 
#               This feature is not supported with smtp header/body
#               checks.
# 
#        WARN optional text...
#               Log a "warning:" record with the  optional  text...
#               (or log a generic text), and inspect the next input
#               line. This action is useful for debugging  and  for
#               testing  a  pattern  before  applying  more drastic
#               actions.
# 
# BUGS
#        Empty lines never match, because some map types mis-behave
#        when  given  a zero-length search string.  This limitation
#        may be removed for regular expression tables in  a  future
#        release.
# 
#        Many  people  overlook  the main limitations of header and
#        body_checks rules.
# 
#        o      These rules operate on one logical  message  header
#               or one body line at a time. A decision made for one
#               line is not carried over to the next line.
# 
#        o      If text in the message body is encoded  (RFC  2045)
#               then the rules need to be specified for the encoded
#               form.
# 
#        o      Likewise, when message  headers  are  encoded  (RFC
#               2047)  then  the rules need to be specified for the
#               encoded form.
# 
#        Message headers added by the cleanup(8) daemon itself  are
#        excluded from inspection. Examples of such message headers
#        are From:, To:, Message-ID:, Date:.
# 
#        Message headers deleted by the cleanup(8) daemon  will  be
#        examined before they are deleted. Examples are: Bcc:, Con-
#        tent-Length:, Return-Path:.
# 
# CONFIGURATION PARAMETERS
#        body_checks
#               Lookup tables with content filter rules for message
#               body lines.  These filters see one physical line at
#               a time, in chunks  of  at  most  $line_length_limit
#               bytes.
# 
#        body_checks_size_limit
#               The  amount  of  content  per  message body segment
#               (attachment) that is subjected to $body_checks fil-
#               tering.
# 
#        header_checks
# 
#        mime_header_checks (default: $header_checks)
# 
#        nested_header_checks (default: $header_checks)
#               Lookup tables with content filter rules for message
#               header lines: respectively, these  are  applied  to
#               the  initial  message  headers  (not including MIME
#               headers), to the MIME headers anywhere in the  mes-
#               sage,  and  to the initial headers of attached mes-
#               sages.
# 
#               Note: these filters see one logical message  header
#               at  a time, even when a message header spans multi-
#               ple lines. Message headers  that  are  longer  than
#               $header_size_limit characters are truncated.
# 
#        disable_mime_input_processing
#               While  receiving mail, give no special treatment to
#               MIME related message headers; all  text  after  the
#               initial message headers is considered to be part of
#               the message body. This means that header_checks  is
#               applied  to  all  the  initial message headers, and
#               that body_checks is applied to the remainder of the
#               message.
# 
#               Note:  when  used  in this manner, body_checks will
#               process a multi-line message header one line  at  a
#               time.
# 
# EXAMPLES
#        Header  pattern  to  block  attachments with bad file name
#        extensions.  For convenience, the PCRE /x flag  is  speci-
#        fied,  so  that  there  is no need to collapse the pattern
#        into  a  single  line  of  text.   The  purpose   of   the
#        [[:xdigit:]] sub-expressions is to recognize Windows CLSID
#        strings.
# 
#        /etc/postfix/main.cf:
#            header_checks = pcre:/etc/postfix/header_checks.pcre
# 
#        /etc/postfix/header_checks.pcre:
#            /^Content-(Disposition|Type).*name\s*=\s*"?([^;]*(\.|=2E)(
#              ade|adp|asp|bas|bat|chm|cmd|com|cpl|crt|dll|exe|
#              hlp|ht[at]|
#              inf|ins|isp|jse?|lnk|md[betw]|ms[cipt]|nws|
#              \{[[:xdigit:]]{8}(?:-[[:xdigit:]]{4}){3}-[[:xdigit:]]{12}\}|
#              ops|pcd|pif|prf|reg|sc[frt]|sh[bsm]|swf|
#              vb[esx]?|vxd|ws[cfh]))(\?=)?"?\s*(;|$)/x
#                REJECT Attachment name "$2" may not end with ".$4"
# 
#        Body pattern to stop a specific HTML browser vulnerability
#        exploit.
# 
#        /etc/postfix/main.cf:
#            body_checks = regexp:/etc/postfix/body_checks
# 
#        /etc/postfix/body_checks:
#            /^<iframe src=(3D)?cid:.* height=(3D)?0 width=(3D)?0>$/
#                REJECT IFRAME vulnerability exploit
# 
# SEE ALSO
#        cleanup(8), canonicalize and enqueue Postfix message
#        pcre_table(5), format of PCRE lookup tables
#        regexp_table(5), format of POSIX regular expression tables
#        postconf(1), Postfix configuration utility
#        postmap(1), Postfix lookup table management
#        postsuper(1), Postfix janitor
#        postcat(1), show Postfix queue file contents
#        RFC 2045, base64 and quoted-printable encoding rules
#        RFC 2047, message header encoding for non-ASCII text
# 
# README FILES
#        Use  "postconf  readme_directory" or "postconf html_direc-
#        tory" to locate this information.
#        DATABASE_README, Postfix lookup table overview
#        CONTENT_INSPECTION_README, Postfix content inspection overview
#        BUILTIN_FILTER_README, Postfix built-in content inspection
#        BACKSCATTER_README, blocking returned forged mail
# 
# LICENSE
#        The Secure Mailer license must be  distributed  with  this
#        software.
# 
# AUTHOR(S)
#        Wietse Venema
#        IBM T.J. Watson Research
#        P.O. Box 704
#        Yorktown Heights, NY 10598, USA
# 
#        Wietse Venema
#        Google, Inc.
#        111 8th Avenue
#        New York, NY 10011, USA
# 
#                                                               HEADER_CHECKS(5)