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ipn, safesocket: use Windows token in LocalAPI

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On Windows, the idiomatic way to check access on a named pipe is for
the server to impersonate the client on its current OS thread, perform
access checks using the client's access token, and then revert the OS
thread's access token back to its true self.

The access token is a better representation of the client's rights than just
a username/userid check, as it represents the client's effective rights
at connection time, which might differ from their normal rights.

This patch updates safesocket to do the aforementioned impersonation,
extract the token handle, and then revert the impersonation. We retain
the token handle for the remaining duration of the connection (the token
continues to be valid even after we have reverted back to self).

Since the token is a property of the connection, I changed ipnauth to wrap
the concrete net.Conn to include the token. I then plumbed that change
through ipnlocal, ipnserver, and localapi as necessary.

I also added a PermitLocalAdmin flag to the localapi Handler which I intend
to use for controlling access to a few new localapi endpoints intended
for configuring auto-update.

Updates https://github.com/tailscale/tailscale/issues/755

Signed-off-by: Aaron Klotz <aaron@tailscale.com>
This commit is contained in:
Aaron Klotz
2023-10-25 14:48:05 -06:00
parent ef596aed9b
commit 95671b71a6
13 changed files with 487 additions and 75 deletions
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12
cmd/derper/depaware.txt
View File

@@ -2,11 +2,6 @@ tailscale.com/cmd/derper dependencies: (generated by github.com/tailscale/depawa
filippo.io/edwards25519 from github.com/hdevalence/ed25519consensus
filippo.io/edwards25519/field from filippo.io/edwards25519
W 💣 github.com/Microsoft/go-winio from tailscale.com/safesocket
W 💣 github.com/Microsoft/go-winio/internal/fs from github.com/Microsoft/go-winio
W 💣 github.com/Microsoft/go-winio/internal/socket from github.com/Microsoft/go-winio
W github.com/Microsoft/go-winio/internal/stringbuffer from github.com/Microsoft/go-winio/internal/fs
W github.com/Microsoft/go-winio/pkg/guid from github.com/Microsoft/go-winio+
W 💣 github.com/alexbrainman/sspi from github.com/alexbrainman/sspi/internal/common+
W github.com/alexbrainman/sspi/internal/common from github.com/alexbrainman/sspi/negotiate
W 💣 github.com/alexbrainman/sspi/negotiate from tailscale.com/net/tshttpproxy
@@ -43,6 +38,11 @@ tailscale.com/cmd/derper dependencies: (generated by github.com/tailscale/depawa
LD github.com/prometheus/procfs from github.com/prometheus/client_golang/prometheus
LD github.com/prometheus/procfs/internal/fs from github.com/prometheus/procfs
LD github.com/prometheus/procfs/internal/util from github.com/prometheus/procfs
W 💣 github.com/tailscale/go-winio from tailscale.com/safesocket
W 💣 github.com/tailscale/go-winio/internal/fs from github.com/tailscale/go-winio
W 💣 github.com/tailscale/go-winio/internal/socket from github.com/tailscale/go-winio
W github.com/tailscale/go-winio/internal/stringbuffer from github.com/tailscale/go-winio/internal/fs
W github.com/tailscale/go-winio/pkg/guid from github.com/tailscale/go-winio+
L 💣 github.com/tailscale/netlink from tailscale.com/util/linuxfw
L 💣 github.com/vishvananda/netlink/nl from github.com/tailscale/netlink
L github.com/vishvananda/netns from github.com/tailscale/netlink+
@@ -111,7 +111,7 @@ tailscale.com/cmd/derper dependencies: (generated by github.com/tailscale/depawa
💣 tailscale.com/net/tshttpproxy from tailscale.com/derp/derphttp+
tailscale.com/net/wsconn from tailscale.com/cmd/derper+
tailscale.com/paths from tailscale.com/client/tailscale
tailscale.com/safesocket from tailscale.com/client/tailscale
💣 tailscale.com/safesocket from tailscale.com/client/tailscale
tailscale.com/syncs from tailscale.com/cmd/derper+
tailscale.com/tailcfg from tailscale.com/client/tailscale+
tailscale.com/tka from tailscale.com/client/tailscale+