** Also affects: samba (Ubuntu Trusty)
Importance: Undecided
Status: New
** Also affects: samba (Ubuntu Xenial)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1583324
Title:
Samba won't start when an include statement in smb.conf has a variable
substitution
Status in samba package in Ubuntu:
Fix Released
Status in samba source package in Trusty:
In Progress
Status in samba source package in Xenial:
In Progress
Bug description:
[Impact]
Samba in AD mode refuses to start when the smb.conf file contains an
include line with a variable substitution like "include =
/etc/samba/smb.conf.%U"
This happens because the initscript calls "samba-tool testparm" to
obtain a configuration parameter from smb.conf, and this testparm tool
fails because it doesn't expand the %U macro and fails to read
"/etc/samba/smb.conf." (note the ending dot).
Note that "samba-tool testparm" is different from just "testparm". The
latter doesn't fail. We could just replace one with the other in the
initscript, but later on in the process of provisioning an AD
controller this error is encountered again, so it's best to fix it
properly.
[Test Case]
* install samba:
sudo apt install samba
* create /etc/samba/smb.conf with this content:
[global]
netbios name = samba
log file = /var/log/samba/log.%m
map to guest = Bad User
max log size = 1000
obey pam restrictions = Yes
pam password change = Yes
panic action = /usr/share/samba/panic-action %d
passwd chat = *Enter\snew\s*\spassword:* %n\n
*Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .
passwd program = /usr/bin/passwd %u
server string = %h server (Samba, Ubuntu)
unix password sync = Yes
usershare allow guests = Yes
idmap config * : backend = tdb
include = /etc/samba/smb.conf.%U
* run the command that fails:
ubuntu@trusty-samba-include:~$ sudo samba-tool testparm --suppress-prompt
ERROR: Unable to load default file
ubuntu@trusty-samba-include:~$ echo $?
255
* install the updated packages and run the same command again. This time it
will work, exit with status 0, and show the main config file.
ubuntu@trusty-samba-include:~$ sudo samba-tool testparm --suppress-prompt
# Global parameters
[global]
netbios name = SAMBA
server string = %h server (Samba, Ubuntu)
map to guest = Bad User
obey pam restrictions = Yes
pam password change = Yes
passwd program = /usr/bin/passwd %u
passwd chat = *Enter\snew\s*\spassword:* %n\n
*Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .
unix password sync = Yes
log file = /var/log/samba/log.%m
max log size = 1000
usershare allow guests = Yes
panic action = /usr/share/samba/panic-action %d
idmap config * : backend = tdb
include = /etc/samba/smb.conf.%U
ubuntu@trusty-samba-include:~$ echo $?
0
[Regression Potential]
* discussion of how regressions are most likely to manifest as a
result of this change.
* It is assumed that any SRU candidate patch is well-tested before
upload and has a low overall risk of regression, but it's important
to make the effort to think about what ''could'' happen in the
event of a regression.
* This both shows the SRU team that the risks have been considered,
and provides guidance to testers in regression-testing the SRU.
[Other Info]
* Anything else you think is useful to include
* Anticipate questions from users, SRU, +1 maintenance, security teams and
the Technical Board
* and address these questions in advance
[Original Description]
Samba refuses to start when the smb.conf file contains an include line
with a variable substitution like "include = /etc/samba/smb.conf.%U"
According to the man page for smb.conf, all but a few specific
variable substitutions should work.
include (G)
This allows you to include one config file inside another.
The file is included literally, as though typed in place.
It takes the standard substitutions, except %u, %P and %S.
The parameter include = registry has a special meaning: It does
not include a file named registry from the current working directory, but
instead reads the global configuration options from the registry.
See the section on registry-based configuration for details. Note that
this option automatically activates registry shares.
Default: include =
Example: include = /usr/local/samba/lib/admin_smb.conf
It is probably related to this bug in samba:
https://bugzilla.samba.org/show_bug.cgi?id=10722
Description: Ubuntu 16.04 LTS
Release: 16.04
samba:
Installed: 2:4.3.9+dfsg-0ubuntu0.16.04.1
Candidate: 2:4.3.9+dfsg-0ubuntu0.16.04.1
Version table:
*** 2:4.3.9+dfsg-0ubuntu0.16.04.1 500
500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64
Packages
500 http://security.ubuntu.com/ubuntu xenial-security/main amd64
Packages
100 /var/lib/dpkg/status
2:4.3.8+dfsg-0ubuntu1 500
500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
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