I have implemented the proposed fix in our infrastructure by having
Puppet modify the /usr/sbin/bootmail script and change the last line as
specified above to use the -a option for setting the From: header:
print_mail_text | sed -e s/[^[:print:]]//g | rootsign | mail -s
$subject -a From: Bootmail ${FROM_MAIL} $recipients
Works well, FWIW.
** Description changed:
bsd-mailx recently had a security update that completely removes support
for specifying classic sendmail options after -- on the command line.
See http://changelogs.ubuntu.com/changelogs/pool/main/b/bsd-mailx/bsd-
mailx_8.1.2-0.2006cvs-1ubuntu0.1/changelog for 8.1.2-0.2006cvs-
1ubuntu0.1. This is on Ubuntu 12.04.
The update breaks the way Bootmail (and probably quite a few other
scripts) constructs its mail messages. Currently it looks like this:
print_mail_text | sed -e s/[^[:print:]]//g | rootsign | mail -s
$subject $recipients -- -F Bootmail -f $FROM_MAIL
The part after --, i.e. the switches -F and -f, is now no longer
supported by bsd-mailx and results in bad address syntax error
messages in /var/log/mail.log:
Jan 26 16:20:09 example01 postfix/error[31885]: 4351640CB7:
to=-f...@web01.example.com, orig_to=-F, relay=none, delay=0.16,
delays=0.12/0/0/0.05, dsn=5.1.3, status=bounced (bad address syntax)
I reported a bug against bsd-mailx in
https://bugs.launchpad.net/ubuntu/+source/bsd-mailx/+bug/1414684 because
this change is obviously quite troublesome for any script that relies on
mailx understanding sendmail options.
To fix this in Bootmail I propose using the -a commandline switch to
set additional mail headers. Something like this:
print_mail_text | sed -e s/[^[:print:]]//g | rootsign | mail -s
- $subject -a Bootmail ${FROM_MAIL} $recipients
+ $subject -a From: Bootmail ${FROM_MAIL} $recipients
This has the advantage that it works with (probably) all bsd-mailx
versions and most other mailx variants as well, including those that
never supported specifying sendmail options.
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https://bugs.launchpad.net/bugs/1414696
Title:
mailx commandline broken after recent bsd-mailx security update
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