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Nick Khyl 551d6ae0f3 ipn, ipn/ipnauth: implement API surface for LocalBackend access checking ... We have a lot of access checks spread around the ipnserver, ipnlocal, localapi, and ipnauth packages, with a significant number of platform-specific checks that are used exclusively on either Windows or Unix-like platforms. Additionally, with the exception of a few Windows-specific checks, most of these checks are per-device rather than per-profile, which is not always correct even on single-user/single-session environments, but even more problematic on multi-user/multi-session environments such as Windows. We initially attempted to map all possible operations onto the permitRead/permitWrite access flags. However, these flags are not utilized on Windows and prove insufficient on Unix machines. Specifically, on Windows, the first user to connect is granted full access, while subsequent logged-in users have no access to the LocalAPI at all. This restriction applies regardless of the environment, local user roles (e.g., whether a Windows user is a local admin), or whether they are the active user on a shared Windows client device. Conversely, on Unix, we introduced the permitCert flag to enable granting non-root web servers (such as www-data, caddy, nginx, etc.) access to certificates. We also added additional access check to distinguish local admins (root on Unix-like platforms, elevated admins on Windows) from users with permitWrite access, and used it as a fix for the serve path LPE. A more fine-grained access control system could better suit our current and future needs, especially in improving the UX across various scenarios on corporate and personal Windows devices. This adds an API surface in ipnauth that will be used in LocalBackend to check access to individual Tailscale profiles as well as any device-wide information and operations. Updates tailscale/corp#18342 Signed-off-by: Nick Khyl <nickk@tailscale.com>		4 weeks ago
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conffile	ipn/{conffile,ipnlocal}: start booting tailscaled from a config file w/ auth key	7 months ago
ipnauth	ipn, ipn/ipnauth: implement API surface for LocalBackend access checking	4 weeks ago
ipnlocal	ipn/ipnlocal,clientupdate: disallow auto-updates in containers (#11814)	4 weeks ago
ipnserver	all: use Go 1.22 range-over-int	1 month ago
ipnstate	ipn/ipnlocal: populate peers' capabilities (#11365)	1 month ago
localapi	all: use Go 1.22 range-over-int	1 month ago
policy	ipn,tailconfig: clean up unreleased and removed app connector service	6 months ago
store	ipn/store: omit AWS & Kubernetes support on 'small' Linux GOARCHes	1 month ago
backend.go	ipn: remove unused Options.LegacyMigrationPrefs	1 month ago
conf.go	cmd/k8s-operator,ipn/conf.go: fix --accept-routes for proxies (#11453)	2 months ago
doc.go	ipn, ipn/ipnauth: implement API surface for LocalBackend access checking	4 weeks ago
errors.go	ipn, ipn/ipnauth: implement API surface for LocalBackend access checking	4 weeks ago
ipn_clone.go	ipn, ipn/ipnauth: implement API surface for LocalBackend access checking	4 weeks ago
ipn_test.go	net/packet: split off checksum munging into different pkg	7 months ago
ipn_view.go	ipn, ipn/ipnauth: implement API surface for LocalBackend access checking	4 weeks ago
prefs.go	ipn, ipn/ipnauth: implement API surface for LocalBackend access checking	4 weeks ago
prefs_test.go	all: use Go 1.22 range-over-int	1 month ago
serve.go	all: deprecate Node.Capabilities (more), remove PeerChange.Capabilities [capver 89]	2 months ago
serve_test.go	{ipn/serve,cmd/tailscale/cli}: move some shared funcs to ipn	2 months ago
store.go	ipn: add comment about thread-safety to StateStore	2 months ago
store_test.go	ipn: avoid useless no-op WriteState calls	9 months ago