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Bug 1690444 - Add policy for cockpit-cert-session
Summary: Add policy for cockpit-cert-session
Alias: None
Product: Fedora
Classification: Fedora
Component: selinux-policy
Version: 29
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
Assignee: Zdenek Pytela
QA Contact: Fedora Extras Quality Assurance
Depends On:
Blocks: 1678465
TreeView+ depends on / blocked
Reported: 2019-03-19 13:46 UTC by Martin Pitt
Modified: 2019-04-11 08:29 UTC (History)
5 users (show)

Fixed In Version: selinux-policy-3.14.2-53.fc29
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Last Closed: 2019-04-08 01:52:56 UTC

Attachments (Terms of Use)

Description Martin Pitt 2019-03-19 13:46:59 UTC
Description of problem: As part of adding smart card authentication support to Cockpit, I'm adding a new /usr/libexec/cockpit-cert-session auth command to Cockpit. This is similar to the existing /usr/libexec/cockpit-session, except that it maps a client-side TLS certificate to a user name via sssd [1] instead of the user/password PAM auth.

By and large this needs the same cockpit_session_t privileges as cockpit-session, except that in addition it also needs to be allowed to talk to sssd on D-Bus.

So for the new binary I did

    semanage fcontext -a /usr/libexec/cockpit-cert-session -t cockpit_session_exec_t
    restorecon /usr/libexec/cockpit-cert-session

and to allow D-Bus with sssd I did

   cat <<EOF > /tmp/local.te
module local 1.0;
require { type cockpit_session_t; type sssd_t; class dbus send_msg; }
allow cockpit_session_t sssd_t:dbus send_msg;
allow sssd_t cockpit_session_t:dbus send_msg;

    checkmodule -M -m -o /tmp/local.mod /tmp/local.te
    semodule_package -o /tmp/local.pp -m /tmp/local.mod
    semodule -i /tmp/local.pp

With these, everything works fine in enforcing mode, without any (new) avc denials.


Version-Release number of selected component (if applicable):


Comment 1 Zdenek Pytela 2019-03-19 14:13:53 UTC
PR created:

Comment 2 Zdenek Pytela 2019-03-19 14:58:18 UTC

When is this feature expected to be added - is F30 as the target release enough?

Comment 3 Martin Pitt 2019-03-19 16:14:13 UTC

Yes, absolutely. We'll also need it in RHEL downstream at some point, but I'll clone this bug/file it once it becomes relevant. I'm filing this early to avoid a rush on any side.

Is the information enough here, or should I try and translate the /tmp/local.te into a PR for selinux-policy?


Comment 4 Zdenek Pytela 2019-03-19 16:23:54 UTC

I created the PR based on your request stating it is enough for the feature to be working, just using existing interface. Feel free to review or try out.

Comment 5 Martin Pitt 2019-03-19 16:39:52 UTC
Hang on, on Fedora 29 (not on RHEL 8 or anywhere else) I get these two violations. They don't break the operation, but still cause unexpected log errors:

audit: type=1400 audit(1553006049.704:621): avc:  denied  { map } for  pid=8208 comm="pool" path="/etc/pki/ca-trust/source/README" dev="dm-0" ino=8538086 scontext=system_u:system_r:cockpit_ws_t:s0 tcontext=system_u:object_r:cert_t:s0 tclass=file permissive=0
audit: type=1400 audit(1553006049.710:622): avc:  denied  { map } for  pid=8208 comm="pool" path="/etc/pki/ca-trust/source/ipa.p11-kit" dev="dm-0" ino=9401424 scontext=system_u:system_r:cockpit_ws_t:s0 tcontext=system_u:object_r:cert_t:s0 tclass=file permissive=0

I'm not sure what "pool" is (there is no such binary), but I'm fairly sure that this is cockpit's web server trying to validate the TLS certificate, through glib-networking → gnutls.

I'll play around with that a bit and see how to extend the policy to allow this. At this point I suppose it's better to follow up on the PR. Thank you!

Comment 6 Zdenek Pytela 2019-03-22 10:06:47 UTC
Base policy PR for miscfiles_dontaudit_map_generic_certs interface:

Comment 7 Fedora Update System 2019-04-05 17:27:50 UTC
selinux-policy-3.14.2-53.fc29 has been submitted as an update to Fedora 29.

Comment 8 Fedora Update System 2019-04-06 20:51:10 UTC
selinux-policy-3.14.2-53.fc29 has been pushed to the Fedora 29 testing repository. If problems still persist, please make note of it in this bug report.
See for
instructions on how to install test updates.
You can provide feedback for this update here:

Comment 9 Fedora Update System 2019-04-08 01:52:56 UTC
selinux-policy-3.14.2-53.fc29 has been pushed to the Fedora 29 stable repository. If problems still persist, please make note of it in this bug report.

Comment 10 Martin Pitt 2019-04-11 08:29:26 UTC
For the record, these changes are *not* present in F29, and also not mentioned in the selinux-policy-3.14.2-53.fc29 changelog. I assume the bug should have been closed in F30 only?

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