daemon tasks are actions that are executed in background by the daemon.
They're started from the GUI (server) via a Notification (protobuf),
with the type TASK_START (protobuf).
Once received in the daemon, the TaskManager starts the task in
background.
Tasks may run at interval times (every 5s, 2days, etc), until they
finish an operation, until a timeout, etc.
Each task has each own configuration options, which will customize the
behaviour of its operations.
In this version, if the GUI is closed, the daemon will stop all the
running tasks.
Each Task has a flag to ignore this behaviour, for example if they need
to run until they finish and only send a notification to the GUI,
instead of streaming data continuously to the GUI (server).
- Up until now we only had one task that could be initiated from the GUI:
the process monitor dialog. It has been migrated to a Task{}.
- go.mod bumped to v1.20, to use unsafe string functions.
- go.sum updated accordingly.
Up until now we intercepted query and DNS answers using these methods:
- Intercepting DNS queries to port 53.
- Intercepting DNS answers from port 53
- Intercepting glibc DNS functions.
Unfortunately there are scenarios where these methods are not enough:
- When using DNSSEC, DoT, DoH, etc.
- When resolvers return DNS answers from cache
- When resolvers don't use glibc functions to resolve domains.
- When applications use D-BUS to query for domain names instead of
using UDP/TCP (VPNs, flatpaks, electron based apps, etc.).
With this new DNS monitor now we're able to intercept DNS answers when
systemd-resolved is used to resolve domains.
This includes queries from flatpaks and others containerized
applications, as well as cyphered DNS queries.
Closes#874
- Bump nftable version to depend on latest version with fixes.
- Include opensnitch-dns.o eBPF object when creating the deb package.
- Replaced Suggests by Recommends, to install addtional but not
essential packages (like python3-pyasnc, and others).
- Added python3-grpcio, python3-protobuf and python3-slugify as
dependencies.
For systems without these packages, we'll use the old debian/ dir.
* Allow to configure firewall rules from the GUI (WIP)
New features:
- Configure and list system firewall rules from the GUI (nftables).
- Configure chains' policies.
- Add simple rules to allow incoming ports.
- Add simple rules to exclude apps (ports) from being intercepted.
This feature is only available for nftables. iptables is still supported,
you can add rules to the configuration file and they'll be loaded, but
you can't configure them from the GUI.
More information: #592
When blocking a connection via libnetfilter-queue using NF_DROP the
connection is discarded. If the blocked connection is a DNS query, the app
that initiated it will wait until it times out, which is ~30s.
This behaviour can for example cause slowdowns loading web pages: #481
This change adds the option to reject connections by killing the socket
that initiated them.
Denying:
$ time telnet 1.1.1.1 22
Trying 1.1.1.1...
telnet: Unable to connect to remote host: Connection timed out
real 2m10,039s
Rejecting:
$ time telnet 1.1.1.1 22
Trying 1.1.1.1...
telnet: Unable to connect to remote host: Software caused connection abort
real 0m0,005s
Added basic nftables support, which adds the needed rules to intercept
outgoing network traffic and DNS responses. System rules will be added
soon.
What netfilter subsystem to use is determined based on the following:
- nftables: if the _iptables_ binary is not present in the system, or
if the iptables version (iptables -V) is
"iptables vX.Y.Z (nf_tables)".
- iptables: in the rest of the cases.
When building the project with protoc-gen-go version 1.5.1,
it fails with the following:
```
protoc -I. ui.proto --go_out=plugins=grpc:../daemon/ui/protocol/
protoc-gen-go: unable to determine Go import path for "ui.proto"
Please specify either:
• a "go_package" option in the .proto source file, or
• a "M" argument on the command line.
See https://developers.google.com/protocol-buffers/docs/reference/go-generated#package for more information.
--go_out: protoc-gen-go: Plugin failed with status code 1.
```
This can be fixed by adding the full go package as an option in the
proto file. To make sure the code is generated to the correct path,
we also have to add add the `paths=source_relative` option to the
protoc plugin.
After this, the code is generated correctly, but the generated code
references classes like grpc.ClientConnInterface which were introduced
in 1.27.0.
