This is step 4 of making syspolicy a build-time feature.
This adds a policyclient.Get() accessor to return the correct
implementation to use: either the real one, or the no-op one. (A third
type, a static one for testing, also exists, so in general a
policyclient.Client should be plumbed around and not always fetched
via policyclient.Get whenever possible, especially if tests need to use
alternate syspolicy)
Updates #16998
Updates #12614
Change-Id: Iaf19670744a596d5918acfa744f5db4564272978
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
We build up maps of both the existing MagicDNS configuration in hosts
and the desired MagicDNS configuration, compare the two, and only
write out a new one if there are changes. The comparison doesn't need
to be perfect, as the occasional false-positive is fine, but this
should greatly reduce rewrites of the hosts file.
I also changed the hosts updating code to remove the CRLF/LF conversion
stuff, and use Fprintf instead of Frintln to let us write those inline.
Updates #14428
Signed-off-by: Aaron Klotz <aaron@tailscale.com>
This adds a package with GP-related functions and types to be used in the future PRs.
It also updates nrptRuleDatabase to use the new package instead of its own gpNotificationWatcher implementation.
Updates #12687
Signed-off-by: Nick Khyl <nickk@tailscale.com>
Without this rule, Windows 8.1 and newer devices issue parallel DNS requests to DNS servers
associated with all network adapters, even when "Override local DNS" is enabled and/or
a Mullvad exit node is being used, resulting in DNS leaks.
This also adds "disable-local-dns-override-via-nrpt" nodeAttr that can be used to disable
the new behavior if needed.
Fixestailscale/corp#20718
Signed-off-by: Nick Khyl <nickk@tailscale.com>
We were being too aggressive when deciding whether to write our NRPT rules
to the local registry key or the group policy registry key.
After once again reviewing the document which calls itself a spec
(see issue), it is clear that the presence of the DnsPolicyConfig subkey
is the important part, not the presence of values set in the DNSClient
subkey. Furthermore, a footnote indicates that the presence of
DnsPolicyConfig in the GPO key will always override its counterpart in
the local key. The implication of this is important: we may unconditionally
write our NRPT rules to the local key. We copy our rules to the policy
key only when it contains NRPT rules belonging to somebody other than us.
Fixes https://github.com/tailscale/corp/issues/19071
Signed-off-by: Aaron Klotz <aaron@tailscale.com>
This adds an initial and intentionally minimal configuration for
golang-ci, fixes the issues reported, and adds a GitHub Action to check
new pull requests against this linter configuration.
Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: I8f38fbc315836a19a094d0d3e986758b9313f163
This updates all source files to use a new standard header for copyright
and license declaration. Notably, copyright no longer includes a date,
and we now use the standard SPDX-License-Identifier header.
This commit was done almost entirely mechanically with perl, and then
some minimal manual fixes.
Updates #6865
Signed-off-by: Will Norris <will@tailscale.com>
This works around the 2.3s delay in short name lookups when SNR is
enabled.
C:\Windows\System32\drivers\etc\hosts file. We only add known hosts that
match the search domains, and we populate the list in order of
Search Domains so that our matching algorithm mimics what Windows would
otherwise do itself if SNR was off.
Updates #1659
Signed-off-by: Maisem Ali <maisem@tailscale.com>
As discussed in previous PRs, we can register for notifications when group
policies are updated and act accordingly.
This patch changes nrptRuleDatabase to receive notifications that group policy
has changed and automatically move our NRPT rules between the local and
group policy subkeys as needed.
Signed-off-by: Aaron Klotz <aaron@tailscale.com>
When there are group policy entries for the NRPT that do not belong to Tailscale,
we recognize that we need to add ourselves to group policy and use that registry
key instead of the local one. We also refresh the group policy settings as
necessary to ensure that our changes take effect immediately.
Fixes https://github.com/tailscale/tailscale/issues/4607
Signed-off-by: Aaron Klotz <aaron@tailscale.com>
AFAICT this isn't documented on MSDN, but based on the issue referenced below,
NRPT rules are not working when a rule specifies > 50 domains.
This patch modifies our NRPT rule generator to split the list of domains
into chunks as necessary, and write a separate rule for each chunk.
For compatibility reasons, we continue to use the hard-coded rule ID, but
as additional rules are required, we generate new GUIDs. Those GUIDs are
stored under the Tailscale registry path so that we know which rules are ours.
I made some changes to winutils to add additional helper functions in support
of both the code and its test: I added additional registry accessors, and also
moved some token accessors from paths to util/winutil.
Fixes https://github.com/tailscale/coral/issues/63
Signed-off-by: Aaron Klotz <aaron@tailscale.com>
Brad Fitzpatrick
Aaron Klotz
Nick Khyl
Andrew Dunham
Will Norris
Josh Soref
Maisem Ali