Commit Graph

4 Commits (44b07aa70889d14949ad08d7ce4455207236423c)

Author SHA1 Message Date
Avery Pennarun 65fbb9c303 wgengine/filter: support subnet mask rules, not just /32 IPs.
This depends on improved support from the control server, to send the
new subnet width (Bits) fields. If these are missing, we fall back to
assuming their value is /32.

Conversely, if the server sends Bits fields to an older client, it will
interpret them as /32 addresses. Since the only rules we allow are
"accept" rules, this will be narrower or equal to the intended rule, so
older clients will simply reject hosts on the wider subnet (fail
closed).

With this change, the internal filter.Matches format has diverged
from the wire format used by controlclient, so move the wire format
into tailcfg and convert it to filter.Matches in controlclient.

Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
5 years ago
Avery Pennarun 85e675940d wgengine/filter: allow ICMP response packets.
Longer term, we should probably update the packet filter to be fully
stateful, for both TCP and ICMP. That is, only ICMP packets related to
a session *we* initiated should be allowed back in. But this is
reasonably secure for now, since wireguard is already trimming most
traffic. The current code would not protect against eg. Ping-of-Death style
attacks from VPN nodes.

Fixes tailscale/tailscale#290.

Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
5 years ago
David Anderson 43becc4334 wgengine/packet: fix minor lint errors.
Signed-off-by: David Anderson <dave@natulte.net>
5 years ago
Earl Lee a8d8b8719a Move Linux client & common packages into a public repo. 5 years ago