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Both as documentation, and to make Coverity happy.
Fixes CID #1241495 and #1241496.
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Instead of operating on an sd_bus_message object, expose an API that has 4
functions:
policy_check_own()
policy_check_hello()
policy_check_recv()
policy_check_send()
This also allows dropping extra code to parse message contents - the bus
proxy already has dedicated code paths for that, and we can hook into
those later.
Tests amended accordingly.
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The kdbus logic name registry logic was changed to transport the actual
name to acquire, release or report in a kdbus item.
This brings the name API a little more in line with other calls, and allows
for later augmentation.
Follow that change on the systemd side.
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Add some test files and routines for dbus policy checking.
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Add policy_check() to actually check whether an incoming message is allowed
by the policy. The code is not yet used from the proxy daemon, though.
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This function is quite useful for debugging. Exiting from it seems
unnecessary.
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Instead of making the function call itself recursively.
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Do the lookup during parsing already, and set i->uid, or i->gid to the
numerical values.
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In the D-Bus policy, the order of items matters, so make sure to store them
in the same order as they are parsed by the sax parser.
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It is redundant to store 'hash' and 'compare' function pointers in
struct Hashmap separately. The functions always comprise a pair.
Store a single pointer to struct hash_ops instead.
systemd keeps hundreds of hashmaps, so this saves a little bit of
memory.
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Since b5eca3a2059f9399d1dc52cbcf9698674c4b1cf0 we don't attempt to GC
busses anymore when unsent messages remain that keep their reference,
when they otherwise are not referenced anymore. This means that if we
explicitly want connections to go away, we need to close them.
With this change we will no do so explicitly wherver we connect to the
bus from a main program (and thus know when the bus connection should go
away), or when we create a private bus connection, that really should go
away after our use.
This fixes connection leaks in the NSS and PAM modules.
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getopt is usually good at printing out a nice error message when
commandline options are invalid. It distinguishes between an unknown
option and a known option with a missing arg. It is better to let it
do its job and not use opterr=0 unless we actually want to suppress
messages. So remove opterr=0 in the few places where it wasn't really
useful.
When an error in options is encountered, we should not print a lengthy
help() and overwhelm the user, when we know precisely what is wrong
with the commandline. In addition, since help() prints to stdout, it
should not be used except when requested with -h or --help.
Also, simplify things here and there.
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We should be interested in k variable.
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Err can't be bigger then zero. Rest of the code uses negative Exxxx values.
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One missing string found.
A few things had to be moved around to make it possible to test them.
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systemctl -H root@foobar:waldi
will now show a list of services running on container "waldi" on host
"foobar", using "root" for authenticating at "foobar".
Since entereing a container requires priviliges, this will only work
correctly for root logins.
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bus-proxyd is not only the bridge between legacy dbus clients and kdbus
but is also used to access remote dbus servers via ssh. Let's make sure
it actually works for that.
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Lets allow LC_ALL=C without corrupted output
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Enforcement is still missing, but at least we can parse it now.
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Either become uid/gid of the client we have been forked for, or become
the "systemd-bus-proxy" user if the client was root. We retain
CAP_IPC_OWNER so that we can tell kdbus we are actually our own client.
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attached to a bus connection
This makes callback behaviour more like sd-event or sd-resolve, and
creates proper object for unregistering callbacks.
Taking the refernce to the slot is optional. If not taken life time of
the slot will be bound to the underlying bus object (or in the case of
an async call until the reply has been recieved).
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patch the sender address
Otherwise old libdbus1 is confused and will not accept our replies.
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Previously, AddMatch/RemoveMatch calls where processed exclusively in
the proxy. That's racy however, since subscribing to a signal might not
complete before the signal is sent due to some subsequent method call.
Hence, in order to expose the same ordering guarantees as dbus1 process
the AddMatch/RemoveMatch calls from the proxy, so that they are
dispatched synchronously to all following messages, thus fixing the
race.
Ultimately, we should probabably dissolve the driver entirely into the
proxy, as it is purely a compatibility feature anyway...
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As pointed-out by clang -Wunreachable-code.
No behaviour changes.
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first (or second)
Previously the returned object of constructor functions where sometimes
returned as last, sometimes as first and sometimes as second parameter.
Let's clean this up a bit. Here are the new rules:
1. The object the new object is derived from is put first, if there is any
2. The object we are creating will be returned in the next arguments
3. This is followed by any additional arguments
Rationale:
For functions that operate on an object we always put that object first.
Constructors should probably not be too different in this regard. Also,
if the additional parameters might want to use varargs which suggests to
put them last.
Note that this new scheme only applies to constructor functions, not to
all other functions. We do give a lot of freedom for those.
Note that this commit only changes the order of the new functions we
added, for old ones we accept the wrong order and leave it like that.
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In trying to track down a stupid linker bug, I noticed a bunch of
memset() calls that should be using memzero() to make it more "obvious"
that the options are correct (i.e. 0 is not the length, but the data to
set). So fix up all current calls to memset(foo, 0, length) to
memzero(foo, length).
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well-known name into the sender
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(The kernel module got fixed, so let's reenable this again)
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right now
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Make sure we print a message when exiting with an error.
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EOF is not an error so we should not print an error message about it.
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It is nicer to predefine patterns using configure time check instead of
using casts everywhere.
Since we do not need to use any flags, include "%" in the format instead
of excluding it like PRI* macros.
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gdm relies on the policy to deny its own requests to not deadlock. Given
that we currently do not enforce any policy in the dbus1 compat proxy
service this means that gdm will necessarily deadlock on our systems.
To work around this, enforce a fixed policy teomporarily, until we
interpret the legacy XML policy in full.
Booh, gdm, booh, for requring this and making me waste two days on
tracking this brokenness down.
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