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imsd, imsd-ofonod: let polkit decide call control, not the account name

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The system-bus policies granted net.catcrafts.IMS1 and org.ofono to root
and to the account `user`, postmarketOS's default name, so on a unit
whose account is called something else dbus denied every Dial from the
dialer — nothing in imsd's journal, nothing on screen. A field user
found it by trial (alyx report 14, 2026-09-20; ims ledger F14).

Let any local account reach both names and have the daemons decide:
placing, answering or ending a call needs polkit's
net.catcrafts.IMS1.Voice (the active local session; not an ssh login, an
inactive session or a system service account). imsd-ofonod asks about
its own callers, since its calls reach imsd as root. Reads such as the
status and the call list are not gated, and a refusal is logged with the
sender; a `--session` run, the development mode without root or polkit,
leaves the gate off. The check is ImsdBus, a small GLib module both
daemons link; the package depends on polkit.

An upgrade restarts both daemons (the previous commit), so the open
policy faces the old, ungated daemons only until the apk transaction
ends.

Tested on the dev phone (KPN) in builds of this series; not every path
has run there.
This commit is contained in:
Jorijn van der Graaf 2026-10-03 20:44:58 +02:00
commit f18baf2790
Signed by: jorijnvdgraaf
GPG key ID: 2937E59CDCC1BCFB
13 changed files with 245 additions and 52 deletions
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22
packaging/org.ofono.conf
View file

@ -15,20 +15,20 @@
<allow own="org.ofono"/>
<!-- imsd (root) reaches this daemon only by broadcast signals, and
dbus-broker checks a broadcast against the sender's send policy for
every name the receiver owns (dbus-daemon does not): without this
line the default deny below silently drops every CallAdded /
CallStateChanged from imsd on the way to imsd-ofonod (found on the
FP6, 2026-09-20). -->
every name the receiver owns (dbus-daemon does not). The default
below allows sending too since 0.3.10; this line stays so that a
tighter default can never again silently drop every CallAdded /
CallStateChanged from imsd on the way to imsd-ofonod, as the old
default deny did (found on the FP6, 2026-09-20). -->
<allow send_destination="org.ofono"/>
</policy>
<!-- the session user's GNOME Calls drives the modem; call control is
exactly what net.catcrafts.IMS1 already grants it through the dialerd -->
<policy user="user">
<!-- Any local account's GNOME Calls may reach imsd-ofonod, whatever the
session account is called; imsd-ofonod asks polkit before call control
(net.catcrafts.IMS1.Voice, as imsd does). Owning the name stays
root's. -->
<policy context="default">
<deny own="org.ofono"/>
<allow send_destination="org.ofono"/>
<allow receive_sender="org.ofono"/>
</policy>
<policy context="default">
<deny own="org.ofono"/>
<deny send_destination="org.ofono"/>
</policy>
</busconfig>