https://bugs.exim.org/show_bug.cgi?id=1863
Bug ID: 1863
Summary: add_header = $spam_report puts 8-bit encoded data into
the header
Product: Exim
Version: 4.84
Hardware: x86
OS: Linux
Status: NEW
Severity: bug
Priority: medium
Component: Content Scanning
Assignee: tom@???
Reporter: martin.von.wittich@???
CC: exim-dev@???
We have configured our exim to use SpamAssassin, and to add the $spam_report to
our mail headers:
> acl_smtp_data = acl_check_data
>
> [...]
>
> acl_check_data:
>
> [...]
>
> # Spamassassin aufrufen und Report in Mailheader einfügen
> warn
> #!authenticated = *
> #!hosts = +lan_hosts
> spam = debian-spamd:true
> add_header = ${sg{$spam_report}{\n\\s+X-Spam-}{\nX-Spam-}}
>
> [...]
The servers use a German locale, and this causes SpamAssassin to use the
translated rule descriptions from the ISO-8859-1 encoded file
/var/lib/spamassassin/3.004000/updates_spamassassin_org/30_text_de.cf, and
these may contain German umlauts:
> dev2.iserv.eu ~ # file /var/lib/spamassassin/3.004000/updates_spamassassin_org/30_text_de.cf
> /var/lib/spamassassin/3.004000/updates_spamassassin_org/30_text_de.cf: ISO-8859 text
> dev2.iserv.eu ~ # grep GTUBE /var/lib/spamassassin/3.004000/updates_spamassassin_org/30_text_de.cf | xxd
> 0000000: 6c61 6e67 2064 6520 6465 7363 7269 6265 lang de describe
> 0000010: 2047 5455 4245 2054 6573 7420 7a75 7220 GTUBE Test zur
> 0000020: 5072 fc66 756e 6720 766f 6e20 416e 7469 Pr.fung von Anti
> 0000030: 2d53 7061 6d2d 536f 6674 7761 7265 0a -Spam-Software.
Unfortunately exim just puts these 8-bit strings directly into the mail header
without encoding the 8-bit characters, which violates the RFC. I looked for a
way to disable the description translations in SpamAssassin (I don't think
they're very useful - the kind of people who read the spam report in a mail
header are likely to be comfortable with English descriptions), but I haven't
found a way to do that.
A possible workaround on the exim side is to use ${map} and ${encode}:
> add_header = ${map{<\n ${sg{$spam_report}{\n\\s+X-Spam-}{\nX-Spam-}}}{${escape:$item}}}
I'm not sure though whether this relatively complicated workaround should be
necessary. The documentation[1] contains an example where $spam_report is added
as a header without escaping it:
> # put headers in all messages (no matter if spam or not)
> warn spam = nobody:true
> add_header = X-Spam-Score: $spam_score ($spam_bar)
> add_header = X-Spam-Report: $spam_report
I think that either $spam_report should behave nice enough so that escaping
isn't necessary, or add_header should automatically escape 8-bit characters, or
the documentation should be amended with the ${map}/${escape} workaround
(beware though: I just came up with that, haven't tested it very much yet ^^)
so that the example code doesn't break when it's run on a server with a
different locale.
Information about the Linux distribution and exim version:
dev2.iserv.eu ~ # dpkg -l | grep exim4
ii exim4 4.84.2-1
all metapackage to ease Exim MTA (v4) installation
ii exim4-base 4.84.2-1
i386 support files for all Exim MTA (v4) packages
ii exim4-config 4.84.2-1
all configuration for the Exim MTA (v4)
ii exim4-daemon-heavy 4.84.2-1
i386 Exim MTA (v4) daemon with extended features,
including exiscan-acl
dev2.iserv.eu ~ # apt-cache policy exim4
exim4:
Installiert: 4.84.2-1
Installationskandidat: 4.84.2-1
Versionstabelle:
4.87-3~bpo8+1 0
100 http://ftp.de.debian.org/debian/ jessie-backports/main i386
Packages
*** 4.84.2-1 0
500 http://ftp.de.debian.org/debian/ jessie/main i386 Packages
500 http://security.debian.org/ jessie/updates/main i386 Packages
100 /var/lib/dpkg/status
dev2.iserv.eu ~ # exim -bV
Exim version 4.84_2 #1 built 13-Mar-2016 22:18:25
Copyright (c) University of Cambridge, 1995 - 2014
(c) The Exim Maintainers and contributors in ACKNOWLEDGMENTS file, 2007 - 2014
Berkeley DB: Berkeley DB 5.3.28: (September 9, 2013)
Support for: crypteq iconv() IPv6 PAM Perl Expand_dlfunc GnuTLS
move_frozen_messages Content_Scanning DKIM Old_Demime PRDR OCSP
Lookups (built-in): lsearch wildlsearch nwildlsearch iplsearch cdb dbm dbmjz
dbmnz dnsdb dsearch ldap ldapdn ldapm mysql nis nis0 passwd pgsql sqlite
Authenticators: cram_md5 cyrus_sasl dovecot plaintext spa
Routers: accept dnslookup ipliteral iplookup manualroute queryprogram redirect
Transports: appendfile/maildir/mailstore/mbx autoreply lmtp pipe smtp
Fixed never_users: 0
Size of off_t: 8
Configuration file is /etc/exim4/exim4.conf
[1]
http://www.exim.org/exim-html-current/doc/html/spec_html/ch-content_scanning_at_acl_time.html
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