- Obtain the process's parent hierarchy.
- Display the hierarchy on the pop-ups and the process dialog.
- [pop-ups] Added a Detailed view with all the metadata of the
process.
- [cache-events] Improved the cache of processes.
- [ruleseditor] Fixed enabling md5 checksum widget.
Related: #413, #406
Now you can create rules to filter processes by checksum. Only md5 is
available at the moment.
There's a global configuration option that you can use to enable or
disable this feature, from the config file or from the Preferences
dialog.
As part of this feature there have been more changes:
- New proc monitor method (PROCESS CONNECTOR) that listens for
exec/exit events from the kernel.
This feature depends on CONFIG_PROC_EVENTS kernel option.
- Only one cache of active processes for ebpf and proc monitor
methods.
More info and details: #413.
When we start to intercept connections, we flush out the conntrack
table, to force already established connections reconnect again so we
can intercept them, and let the user choose if allow or deny them.
Since we no longer use conntrack states to intercept TCP connections, we
now close existing connections, leaving to the applications reestablish
them again.
Local connections are excluded, because it may cause problems with some
local servers.
Both options interfere with the established connections, so you may
experience ocasional network interruptions when enabling the
interception for the first time.
Discussion: #995
For the eBPF monitoring method, we listed and stored local addresses
every second, so that we could later check if the source IP of an
outbound connection was local or not, because sometimes we received
outbound connections like:
443:1.1.1.1 -> 192.168.1.123:12345
This could have been alread solved on this change e090833, so maybe
we no longer need this code.
- Now we subscribe to local addresses events, to receive add/remove
events asynchronously, without having to list local addrs
every second, alliviating CPU usage.
- Fixed creating context object to cancel subroutines. It was not
working properly when switching between proc monitor methods.
Using "ct state NEW" to intercept packets causes some undesired effects:
We intercept packets that not only have the SYN flag set, like ACK,
ACK+PSH or SYN+ACK. Mainly response packets.
This means that the IPs are not always in the expected order:
443:1.1.1.1 -> 192.168.1.123:12345
which causes sometimes not to obtain the process of the connection,
because the connection in the system appears as
12345:192.168.1.123 -> 1.1.1.1:443
Intercepting packets with *only* the SYN flag set seems to resolve
this problem.
- Allow to use SSL certificates to secure unix sockets communications.
- Allow to use abstract users sockets for server and nodes.
Go gRPC doesn't seem to understand unix sockets addresses that start
with "unix-abstract:", and python gRPC doesn't seem to understand
"unix:@" addresses.
Therefore, on the server (python gRPC) we use the format "unix:@" to
specify the address where the server will listen on, and rewrite it to
"unix-abstract:" before starting the server.
Note about certs and abstract unix sockets:
When creating the SSL certificates, you'll have to specify the
address of the unix socket as the Common Name of the certificates:
Address: "unix:@my-abstract-socket"
Common Name: @my-abstract-socket
- Send errors to the server (GUI) if there's any error when reloading
the system fw rules (far from being perfect/optimal, needs a
rewrite).
- Don't load the configuration after saving it, let the watcher reload
it on write change to avoid double reload/duplicated errors.
- Test that the default config is loaded properly.
- Test that changes to the config are saved to disk.
- Test that changes to the config file on disk are reloaded properly.
