[Bug 1858692] Re: ceph-common postinst does not check for ceph user existing externally
Eric Desrochers
eric.desrochers at canonical.com
Thu Jan 9 15:18:12 UTC 2020
Additional note:
This can impact landscape-server installation which as we speak "Depends" on ceph-common.
ceph-common is no longer needed/used in the landscape context since autopilot code got removed.
I'll propose a MP to Simon to remove the Depend from Landscape server.
Nevertheless, I think ceph-common should be debugg a little more (e.g
nsswitch.conf, sssd, ...) to figure out why "getend" can get information
from external user when it should.
** Also affects: landscape
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1858692
Title:
ceph-common postinst does not check for ceph user existing externally
Status in Landscape Server:
In Progress
Status in ceph package in Ubuntu:
Incomplete
Bug description:
If the $SERVER_USER name exists in LDAP outside the server the user
will not exist in /etc/passwd. This will cause the postinst script to
attempt to create the user, which will fail. This user
creation/modification failure then causes the configuration operation
to be marked as failed and prevent the package from completing
installation.
Current workaround is to define $SERVER_USER in /etc/default/ceph or
otherwise export a custom value for this into the environment, so that
the postinst script uses a username that does not exist in LDAP, and
can be created within the local system. Ideally there would be a more
robust check for the existence of the $SERVER_USER perhaps using the
'id' command.
Snippets from /var/lib/dpkg/info/ceph-common.postinst
---
[ -f "/etc/default/ceph" ] && . /etc/default/ceph
[ -z "$SERVER_HOME" ] && SERVER_HOME=/var/lib/ceph
[ -z "$SERVER_USER" ] && SERVER_USER=ceph
[ -z "$SERVER_NAME" ] && SERVER_NAME="Ceph storage service"
[ -z "$SERVER_GROUP" ] && SERVER_GROUP=ceph
[ -z "$SERVER_UID" ] && SERVER_UID=64045 # alloc by Debian base-passwd maintainer
[ -z "$SERVER_GID" ] && SERVER_GID=$SERVER_UID
---
---
case "$1" in
configure)
# create user to avoid running server as root
# 1. create group if not existing
if ! getent group | grep -q "^$SERVER_GROUP:" ; then
addgroup --quiet --system --gid $SERVER_GID \
$SERVER_GROUP 2>/dev/null ||true
fi
# 2. create user if not existing
if ! getent passwd | grep -q "^$SERVER_USER:"; then
adduser --quiet \
--system \
--no-create-home \
--disabled-password \
--uid $SERVER_UID \
--gid $SERVER_GID \
$SERVER_USER 2>/dev/null || true
fi
# 3. adjust passwd entry
usermod -c "$SERVER_NAME" \
-d $SERVER_HOME \
-g $SERVER_GROUP \
$SERVER_USER 2>/dev/null
---
[Impacted scenario]
* lanscape-server installation when the ceph user/group already exists
on the system with non-default UID/GID particularly when the user
exists in LDAP outside the local system.
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