Maniphest T1991

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	dereckson
	Jul 31 2024, 16:21

Description

@DorianWinty has reported that nginx issue:

$ sudo systemctl status nginx
× nginx.service - nginx - high performance web server
     Loaded: loaded (/usr/lib/systemd/system/nginx.service; enabled; preset: disabled)
     Active: failed (Result: exit-code) since Wed 2024-07-31 16:11:27 UTC; 58s ago
   Duration: 5month 2w 3d 5h 12min 14.373s
       Docs: http://nginx.org/en/docs/
    Process: 2788170 ExecStart=/usr/sbin/nginx -c /etc/nginx/nginx.conf (code=exited, status=1/FAILURE)
        CPU: 112ms

Jul 31 16:11:26 docker-002.nasqueron.org systemd[1]: Starting nginx - high performance web server...
Jul 31 16:11:27 docker-002.nasqueron.org nginx[2788170]: nginx: [emerg] open() "/var/log/www/error.log" failed (13: Permission denied)
Jul 31 16:11:27 docker-002.nasqueron.org …

Can be fixed with chcon -t httpd_log_t /var/log/www /var/log/www/*.log, but before I tried a
restorecon and the context has heen lost:

Default context for /var/log	var_log_t
Context for nginx logs	httpd_log_t

As far as I know, https://devcentral.nasqueron.org/source/operations/browse/main/roles/webserver-core/nginx/config.sls$91 takes care to set that context permanently.

Revisions and Commits

rOPS Nasqueron Operations
	D3392	rOPS4a03b8471a74 Avoid egrep in Salt code base

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		Status	Subtype	Assigned	Task
		Open		dereckson	T1991 Context has again been lost on /var/log/www
		Resolved		dereckson	T1992 Install patch on redhat family as part of core

Event Timeline

Issue can be repro on Dwellers:

$ cd /var/log/www
$ ls -lahZ
total 956M
drwx--x--x.  2 nginx web  system_u:object_r:httpd_log_t:s0   41 Apr 17  2023 .
drwxr-xr-x. 12 root  root system_u:object_r:var_log_t:s0   4.0K Jul 28 00:00 ..
-rw-r--r--.  1 nginx web  system_u:object_r:httpd_log_t:s0 373M Jul 31 16:21 access.log
-rw-r--r--.  1 nginx web  system_u:object_r:httpd_log_t:s0 583M Jul 31 16:21 error.log
$ restorecon -F -R /var/log/www
$ ls -lahZ
total 956M
drwx--x--x.  2 nginx web  system_u:object_r:httpd_log_t:s0   41 Apr 17  2023 .
drwxr-xr-x. 12 root  root system_u:object_r:var_log_t:s0   4.0K Jul 28 00:00 ..
-rw-r--r--.  1 nginx web  system_u:object_r:var_log_t:s0   373M Jul 31 16:22 access.log
-rw-r--r--.  1 nginx web  system_u:object_r:var_log_t:s0   583M Jul 31 16:22 error.log

Gotcha!

Complector

$ cd /opt/salt/nasqueron-operations
$ salt dwellers state.apply roles/webserver-core/nginx/config
[…]
----------                                                                                                                                                                                                                                    [3/295]
          ID: selinux_context_nginx_logs
    Function: selinux.fcontext_policy_present
        Name: /var/log/www
      Result: False
     Comment: An exception occurred in this state: Traceback (most recent call last):
                File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/state.py", line 2428, in call
                  ret = self.states[cdata["full"]](
                File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/loader/lazy.py", line 160, in __call__
                  ret = self.loader.run(run_func, *args, **kwargs)
                File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/loader/lazy.py", line 1269, in run
                  return self._last_context.run(self._run_as, _func_or_method, *args, **kwargs)
                File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/loader/lazy.py", line 1284, in _run_as
                  return _func_or_method(*args, **kwargs)
                File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/loader/lazy.py", line 1317, in wrapper
                  return f(*args, **kwargs)
                File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/states/selinux.py", line 326, in fcontext_policy_present
                  current_state = __salt__["selinux.fcontext_get_policy"](
                File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/loader/lazy.py", line 160, in __call__
                  ret = self.loader.run(run_func, *args, **kwargs)
                File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/loader/lazy.py", line 1269, in run
                  return self._last_context.run(self._run_as, _func_or_method, *args, **kwargs)
                File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/loader/lazy.py", line 1284, in _run_as
                  return _func_or_method(*args, **kwargs)
                File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/modules/selinux.py", line 507, in fcontext_get_policy
                  "filespec": parts.group(1).strip(),
              AttributeError: 'NoneType' object has no attribute 'group'
     Started: 16:25:51.413301
    Duration: 391.186 ms
     Changes:
----------
          ID: selinux_context_nginx_logs_applied
    Function: selinux.fcontext_policy_applied
        Name: /var/log/www
      Result: True
     Comment: SElinux policies are already applied for filespec "/var/log/www"
     Started: 16:25:51.804764
    Duration: 6.322 ms
     Changes:
----------
[…]

Already reported upstream: https://github.com/saltstack/salt/issues/65608

dereckson added a project: upstream.Jul 31 2024, 16:30

dereckson moved this task from Backlog to Bug and issues on the Salt board.

I've applied P352 to replace egrep by grep -E on dwellers and docker-002.

That needs to be done every Salt update until we prioritise merging the fix with upstream.

dereckson lowered the priority of this task from High to Normal.Aug 3 2024, 10:11

dereckson added a subtask: T1992: Install patch on redhat family as part of core.Aug 3 2024, 12:04

We can actually provide P352 as hotfix.

See https://github.com/saltstack/salt/issues/56121#issuecomment-585063805 for an example of how to apply a patch against Salt with Salt.

dereckson added a revision: D3392: Avoid egrep in Salt code base.Aug 3 2024, 13:09

dereckson moved this task from Working on to Pending review on the Servers board.Aug 3 2024, 16:32

dereckson moved this task from Backlog to To check again on the upstream board.

dereckson closed subtask T1992: Install patch on redhat family as part of core as Resolved.Aug 5 2024, 19:26

dereckson added a commit: rOPS4a03b8471a74: Avoid egrep in Salt code base.Aug 21 2024, 18:19

Same thing for Dwellers:

Oct 14 00:22:06 dwellers.nasqueron.org nginx[1665274]: nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
Oct 14 00:22:06 dwellers.nasqueron.org nginx[1665274]: nginx: [emerg] open() "/var/log/www/error.log" failed (13: Permission denied)

dereckson moved this task from To check again to To report on the upstream board.Thu, Oct 31, 18:46

Context has again been lost on /var/log/wwwOpen, NormalPublicActions

Description

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Context has again been lost on /var/log/www
Open, NormalPublic
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