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If we generate messages from within bus-proxyd, we really must make sure
that we do not clutter the cookie-namespace of our client. The client has
full control over it, so we cannot steal cookies from it. However, we can
re-use the cookie the client used for our request. As long as we only
send a single message, we're fine.
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The StartServiceByName() call was provided by dbus-daemon to activate a
service without sending a message. On receiption, dbus-daemon schedules
an activation request (different modes are supported) and sends back the
reply once activation is done.
With kdbus, we marked StartServiceByName() as deprecated. There is no
real reason to start services explicitly. Instead, applications should
just *use* the service and rely on it being activated implicitly.
However, we provide compatibility with dbus-daemon and implement
StartServiceByName() on the proxy via a call to
org.freedesktop.DBus.Peer.Ping() on the destination. This will activate
the peer implicitly as part of the no-op Ping() method call (regardless
whether the peer actually implements that call).
Now, the problem is, StartServiceByName() was synchronous on dbus-daemon
but isn't on bus-proxy. Hence, on return, there is no guarantee that
ListNames includes the activated name. As this is required by some
applications, we need to make this synchronous.
This patch makes the proxy track the Ping() method call and send the
reply of StartServiceByName() only once Ping() returned. We do not look
at possible errors of Ping(), as there is no strict requirement for the
peer to implement org.freedesktop.DBus.Peer. Furthermore, any interesting
error should have already been caught by sd_bus_send() before.
Note:
This race was triggered by gdbus. The gdbus-proxy implementation
relies on a name to be available after StartServiceByName()
returns. This is highly fragile and should be dropped by gdbus.
Even if the call is synchronous, there is no reason whatsoever to
assume the service did not exit-on-idle before ListNames()
returns.
However, this race is much less likely than the startup race, so
we try to be compatible to dbus-daemon now.
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We *must not* assume that an entry returned by KDBUS_CMD_LIST only
carries a single KDBUS_ITEM_OWNED_NAME. Similarly, we already parse
multiple such items for message-metadata, so make sure we support the
same on KDBUS_CMD_LIST.
By relying on the kernel to return all names separately, we limit the
kernel API significantly. Stop this and let the kernel decide how to
return its data.
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The lovely libvirtd goes into crazy mode if it receives broadcasts that
it didn't subscribe to. With bus-proxyd, this might happen in 2 cases:
1) The kernel passes us an unmatched signal due to a false-positive
bloom-match.
2) We generate NameOwnerChanged/NameAcquired/NameLost locally even
though the peer didn't subscribe to it.
dbus-daemon is reliable in what signals it passes on. So make sure we
follow that style. Never ever send a signal to a local peer if it doesn't
match an installed filter of that peer.
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Replace ENOTSUP by EOPNOTSUPP as this is what linux actually uses.
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GetConnectionCredentials method was added to dbus-1 specification
more than one year ago. This method should return "[...] as many
credentials as possible for the process connected to the server",
but at this moment only "UnixUserID", "LinuxSecurityLabel" and
"ProcessID" are defined by the specification. We should add support
for next credentials after extending dbus-1 spec.
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This patch removes includes that are not used. The removals were found with
include-what-you-use which checks if any of the symbols from a header is
in use.
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synthetic_reply_method_return_strv()
That way it matches more closely the nomenclature of our other
success reply calls.
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Set proper kdbus_cmd_list object size, otherwise:
dbus-send --system --dest=org.freedesktop.DBus --type=method_call \
print-reply / org.freedesktop.DBus.ListQueuedOwners string:org.freedesktop.systemd1
Error org.freedesktop.DBus.Error.InvalidArgs: Invalid argument
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While it's a lovely scenario, it's probably not really useful. Fix our
GetConnectionUnixUser() to return the actual 'euid' which we asked for,
not the possible uninitialized 'uid'.
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Whenever a process performs an action on an object, the kernel uses the
EUID of the process to do permission checks and to apply on any newly
created objects. The UID of a process is only used if someone *ELSE* acts
on the process. That is, the UID of a process defines who owns the
process, the EUID defines what privileges are used by this process when
performing an action.
Process limits, on the other hand, are always applied to the real UID, not
the effective UID. This is, because a process has a user object linked,
which always corresponds to its UID. A process never has a user object
linked for its EUID. Thus, accounting (and limits) is always done on the
real UID.
This commit fixes all sd-bus users to use the EUID when performing
privilege checks and alike. Furthermore, it fixes unix-creds to be parsed
as EUID, not UID (as the kernel always takes the EUID on UDS). Anyone
using UID (eg., to do user-accounting) has to fall back to the EUID as UDS
does not transmit the UID.
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Make sure to reload our xml policy configuration if requested via the bus.
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Fix whitespace indentation.
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This implements a shared policy cache with read-write locks. We no longer
parse the XML policy in each thread.
This will allow us to easily implement ReloadConfig().
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Move synthesize_*() into synthesize.c and bus_proxy_process_driver() into
driver.c for better code separation.
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