Updates tailscale/corp#25278
Adds definitions for new CLI commands getting added in v1.80. Refactors some pre-existing CLI commands within the `configure` tree to clean up code.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Updates tailscale/corp#25936
This defines a new syspolicy 'Hostname' and allows an IT administrator to override the value we normally read from os.Hostname(). This is particularly useful on Android and iOS devices, where the hostname we get from the OS is really just the device model (a platform restriction to prevent fingerprinting).
If we don't implement this, all devices on the customer's side will look like `google-pixel-7a-1`, `google-pixel-7a-2`, `google-pixel-7a-3`, etc. and it is not feasible for the customer to use the API or worse the admin console to manually fix these names.
Apply code review comment by @nickkhyl
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Co-authored-by: Nick Khyl <1761190+nickkhyl@users.noreply.github.com>
Fixestailscale/tailscale#14563
When creating a NoiseClient, ensure that if any private IP address is provided, with both an `http` scheme and an explicit port number, we do not ever attempt to use HTTPS. We were only handling the case of `127.0.0.1` and `localhost`, but `192.168.x.y` is a private IP as well. This uses the `netip` package to check and adds some logging in case we ever need to troubleshoot this.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Updates tailscale/tailscale#13839
Adds a new blockblame package which can detect common MITM SSL certificates used by network appliances. We use this in `tlsdial` to display a dedicated health warning when we cannot connect to control, and a network appliance MITM attack is detected.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Updates tailscale/tailscale#6148
This is the result of some observations we made today with @raggi. The DNS over HTTPS client currently doesn't cap the number of connections it uses, either in-use or idle. A burst of DNS queries will open multiple connections. Idle connections remain open for 30 seconds (this interval is defined in the dohTransportTimeout constant). For DoH providers like NextDNS which send keep-alives, this means the cellular modem will remain up more than expected to send ACKs if any keep-alives are received while a connection remains idle during those 30 seconds. We can set the IdleConnTimeout to 10 seconds to ensure an idle connection is terminated if no other DNS queries come in after 10 seconds. Additionally, we can cap the number of connections to 1. This ensures that at all times there is only one open DoH connection, either active or idle. If idle, it will be terminated within 10 seconds from the last query.
We also observed all the DoH providers we support are capable of TLS 1.3. We can force this TLS version to reduce the number of packets sent/received each time a TLS connection is established.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Updates tailscale/tailscale#1634
Updates tailscale/tailscale#13265
Captive portal detection uses a custom `net.Dialer` in its `http.Client`. This custom Dialer ensures that the socket is bound specifically to the Wi-Fi interface. This is crucial because without it, if any default routes are set, the outgoing requests for detecting a captive portal would bypass Wi-Fi and go through the default route instead.
The Dialer did not have a Timeout property configured, so the default system timeout was applied. This caused issues in #13265, where we attempted to make captive portal detection requests over an IPsec interface used for Wi-Fi Calling. The call to `connect()` would fail and remain blocked until the system timeout (approximately 1 minute) was reached.
In #13598, I simply excluded the IPsec interface from captive portal detection. This was a quick and safe mitigation for the issue. This PR is a follow-up to make the process more robust, by setting a 3 seconds timeout on any connection establishment on any interface (this is the same timeout interval we were already setting on the HTTP client).
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Updates tailscale/tailscale#1634
Logs from some iOS users indicate that we're pointlessly performing captive portal detection on certain interfaces named ipsec*. These are tunnels with the cellular carrier that do not offer Internet access, and are only used to provide internet calling functionality (VoLTE / VoWiFi).
```
attempting to do captive portal detection on interface ipsec1
attempting to do captive portal detection on interface ipsec6
```
This PR excludes interfaces with the `ipsec` prefix from captive portal detection.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Updates tailscale/tailscale#13326
Adds a CLI subcommand to perform DNS queries using the internal DNS forwarder and observe its internals (namely, which upstream resolvers are being used).
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Updates tailscale/tailscale#13452
Bump the Go toolchain to the latest to pick up changes required to not crash on Android 9/10.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Updates tailscale/tailscale#13326
This PR begins implementing a `tailscale dns` command group in the Tailscale CLI. It provides an initial implementation of `tailscale dns status` which dumps the state of the internal DNS forwarder.
Two new endpoints were added in LocalAPI to support the CLI functionality:
- `/netmap`: dumps a copy of the last received network map (because the CLI shouldn't have to listen to the ipn bus for a copy)
- `/dns-osconfig`: dumps the OS DNS configuration (this will be very handy for the UI clients as well, as they currently do not display this information)
My plan is to implement other subcommands mentioned in tailscale/tailscale#13326, such as `query`, in later PRs.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Updates tailscale/tailscale#177
It appears that the OSS distribution of `tailscaled` is currently unable to get the current system base DNS configuration, as GetBaseConfig() in manager_darwin.go is unimplemented. This PR adds a basic implementation that reads the current values in `/etc/resolv.conf`, to at least unblock DNS resolution via Quad100 if `--accept-dns` is enabled.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Updates tailscale/corp#22120
Adds the ability to start the backend by reading an authkey stored in the syspolicy database (MDM). This is useful for devices that are provisioned in an unattended fashion.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
`DNS unavailable` was marked as a high severity warning. On Android (and other platforms), these trigger a system notification. Here we reduce the severity level to medium. A medium severity warning will still display the warning icon on platforms with a tray icon because of the `ImpactsConnectivity=true` flag being set here, but it won't show a notification anymore. If people enter an area with bad cellular reception, they're bound to receive so many of these notifications and we need to reduce notification fatigue.
Signed-off-by: Andrea Gottardo <andrea@tailscale.com>
Updates tailscale/tailscale#1634
This PR optimizes captive portal detection on Android and iOS by excluding cellular data interfaces (`pdp*` and `rmnet`). As cellular networks do not present captive portals, frequent network switches between Wi-Fi and cellular would otherwise trigger captive detection unnecessarily, causing battery drain.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Fixestailscale/tailscale#12973
Updates tailscale/tailscale#1634
There was a logic issue in the captive detection code we shipped in https://github.com/tailscale/tailscale/pull/12707.
Assume a captive portal has been detected, and the user notified. Upon switching to another Wi-Fi that does *not* have a captive portal, we were issuing a signal to interrupt any pending captive detection attempt. However, we were not also setting the `captive-portal-detected` warnable to healthy. The result was that any "captive portal detected" alert would not be cleared from the UI.
Also fixes a broken log statement value.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Updates tailscale/corp#21949
As discussed with @raggi, this PR updates the static DERPMap embedded in the client to reflect the availability of HTTP on the DERP servers run by Tailscale.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Updates tailscale/tailscale#1634
This PR introduces a new `captive-portal-detected` Warnable which is set to an unhealthy state whenever a captive portal is detected on the local network, preventing Tailscale from connecting.
ipn/ipnlocal: fix captive portal loop shutdown
Change-Id: I7cafdbce68463a16260091bcec1741501a070c95
net/captivedetection: fix mutex misuse
ipn/ipnlocal: ensure that we don't fail to start the timer
Change-Id: I3e43fb19264d793e8707c5031c0898e48e3e7465
Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Fixestailscale/tailscale#12794
We were printing some leftover debug logs within a callback function that would be executed after the test completion, causing the test to fail. This change drops the log calls to address the issue.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Updates tailscale/tailscale#4136
To reduce the likelihood of presenting spurious warnings, add the ability to delay the visibility of certain Warnables, based on a TimeToVisible time.Duration field on each Warnable. The default is zero, meaning that a Warnable is immediately visible to the user when it enters an unhealthy state.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Updates tailscale/tailscale#4136
We should make sure to send the value of ImpactsConnectivity over to the clients using LocalAPI as they need it to display alerts in the GUI properly.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Updates tailscale/tailscale#4136
High severity health warning = a system notification will appear, which can be quite disruptive to the user and cause unnecessary concern in the event of a temporary network issue.
Per design decision (@sonovawolf), the severity of all warnings but "network is down" should be tuned down to medium/low. ImpactsConnectivity should be set, to change the icon to an exclamation mark in some cases, but without a notification bubble.
I also tweaked the messaging for update-available, to reflect how each platform gets updates in different ways.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Fixestailscale/corp#20971
We added some Warnables for DERP failure situations, but their Text currently spits out the DERP region ID ("10") in the UI, which is super ugly. It would be better to provide the RegionName of the DERP region that is failing. We can do so by storing a reference to the last-known DERP map in the health package whenever we fetch one, and using it when generating the notification text.
This way, the following message...
> Tailscale could not connect to the relay server '10'. The server might be temporarily unavailable, or your Internet connection might be down.
becomes:
> Tailscale could not connect to the 'Seattle' relay server. The server might be temporarily unavailable, or your Internet connection might be down.
which is a lot more user-friendly.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Updates tailscale/corp#20969
Right now, when netcheck starts, it asks tailscaled for a copy of the DERPMap. If it doesn't have one, it makes a HTTPS request to controlplane.tailscale.com to fetch one.
This will always fail if you're on a network with a captive portal actively blocking HTTPS traffic. The code appears to hang entirely because the http.Client doesn't have a Timeout set. It just sits there waiting until the request succeeds or fails.
This adds a timeout of 10 seconds, and logs more details about the status of the HTTPS request.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Updates #4136
Small PR to expose the health Warnables dependencies to the GUI via LocalAPI, so that we can only show warnings for root cause issues, and filter out unnecessary messages before user presentation.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Updates tailscale/tailscale#4136
This PR is the first round of work to move from encoding health warnings as strings and use structured data instead. The current health package revolves around the idea of Subsystems. Each subsystem can have (or not have) a Go error associated with it. The overall health of the backend is given by the concatenation of all these errors.
This PR polishes the concept of Warnable introduced by @bradfitz a few weeks ago. Each Warnable is a component of the backend (for instance, things like 'dns' or 'magicsock' are Warnables). Each Warnable has a unique identifying code. A Warnable is an entity we can warn the user about, by setting (or unsetting) a WarningState for it. Warnables have:
- an identifying Code, so that the GUI can track them as their WarningStates come and go
- a Title, which the GUIs can use to tell the user what component of the backend is broken
- a Text, which is a function that is called with a set of Args to generate a more detailed error message to explain the unhappy state
Additionally, this PR also begins to send Warnables and their WarningStates through LocalAPI to the clients, using ipn.Notify messages. An ipn.Notify is only issued when a warning is added or removed from the Tracker.
In a next PR, we'll get rid of subsystems entirely, and we'll start using structured warnings for all errors affecting the backend functionality.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Fixestailscale/corp#18366.
This PR provides serial number collection on iOS, by allowing system administrators to pass a `DeviceSerialNumber` MDM key which can be read by the `posture` package in Go.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Updates corp#15802.
Adds the ability for control to disable the recently added change that uses split DNS in more cases on iOS. This will allow us to disable the feature if it leads to regression in production. We plan to remove this knob once we've verified that the feature works properly.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Updates https://github.com/tailscale/corp/issues/15802.
On iOS exclusively, this PR adds logic to use a split DNS configuration in more cases, with the goal of improving battery life. Acting as the global DNS resolver on iOS should be avoided, as it leads to frequent wakes of IPNExtension.
We try to determine if we can have Tailscale only handle DNS queries for resources inside the tailnet, that is, all routes in the DNS configuration do not require a custom resolver (this is the case for app connectors, for instance).
If so, we set all Routes as MatchDomains. This enables a split DNS configuration which will help preserve battery life. Effectively, for the average Tailscale user who only relies on MagicDNS to resolve *.ts.net domains, this means that Tailscale DNS will only be used for those domains.
This PR doesn't affect users with Override Local DNS enabled. For these users, there should be no difference and Tailscale will continue acting as a global DNS resolver.
Signed-off-by: Andrea Gottardo <andrea@tailscale.com>
Fixestailscale/tailscale#10393Fixestailscale/corp#15412Fixestailscale/corp#19808
On Apple platforms, exit nodes and subnet routers have been unable to relay pings from Tailscale devices to non-Tailscale devices due to sandbox restrictions imposed on our network extensions by Apple. The sandbox prevented the code in netstack.go from spawning the `ping` process which we were using.
Replace that exec call with logic to send an ICMP echo request directly, which appears to work in userspace, and not trigger a sandbox violation in the syslog.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Fixestailscale/corp#19979
A build with version number 275 was uploaded to the App Store without bumping OSS first. The presence of that build is causing any 274.* build to be rejected. To address this, added -1 to the year component, which means new builds will use the 275.* prefix.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Fixestailscale/corp#19459
This PR adds the ability for users of the syspolicy handler to read string arrays from the MDM solution configured on the system.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Fixes tailscale/corp#18441
For a few days, IsMacAppStore() has been returning `false` on App Store builds (IPN-macOS target in Xcode).
I regressed this in #11369 by introducing logic to detect the sandbox by checking for the APP_SANDBOX_CONTAINER_ID environment variable. I thought that was a more robust approach instead of checking the name of the executable. However, it appears that on recent macOS versions this environment variable is no longer getting set, so we should go back to the previous logic that checks for the executable path, or HOME containing references to macsys.
This PR also adds additional checks to the logic by also checking XPC_SERVICE_NAME in addition to HOME where possible. That environment variable is set inside the network extension, either macos or macsys and is good to look at if for any reason HOME is not set.
Updates ENG-2848
We can safely disable the App Sandbox for our macsys GUI, allowing us to use `tailscale ssh` and do a few other things that we've wanted to do for a while. This PR:
- allows Tailscale SSH to be used from the macsys GUI binary when called from a CLI
- tweaks the detection of client variants in prop.go, with new functions `IsMacSys()`, `IsMacSysApp()` and `IsMacAppSandboxEnabled()`
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Updates ENG-2133. Adds the ResetToDefaults visibility policy currently only available on macOS, so that the Windows client can read its value.
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Adds logic in gocross to detect environment variables and pass the right flags so that the backend can be built with the visionOS SDK.
Signed-off-by: Andrea Gottardo <andrea@tailscale.com>
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Fixestailscale/support-escalations#23.
authURLs returned by control expire after 1 hour from creation. Customer reported that the Tailscale client on macOS would sending users to a stale authentication page when clicking on the `Login...` menu item. This can happen when clicking on Login after leaving the device unattended for several days. The device key expires, leading to the creation of a new authURL, however the client doesn't keep track of when the authURL was created. Meaning that `login-interactive` would send the user to an authURL that had expired server-side a long time before.
This PR ensures that whenever `login-interactive` is called via LocalAPI, an authURL that is too old won't be used. We force control to give us a new authURL whenever it's been more than 30 minutes since the last authURL was sent down from control.
Apply suggestions from code review
Set interval to 6 days and 23 hours
Signed-off-by: Andrea Gottardo <andrea@tailscale.com>
Signed-off-by: Andrea Gottardo <andrea@gottardo.me>
Updates #8022
Updates #6075
On iOS, we currently rely on delegated interface information to figure out the default route interface. The NetworkExtension framework in iOS seems to set the delegate interface only once, upon the *creation* of the VPN tunnel. If a network transition (e.g. from Wi-Fi to Cellular) happens while the tunnel is connected, it will be ignored and we will still try to set Wi-Fi as the default route because the delegated interface is not getting updated as connectivity transitions.
Here we work around this on the Swift side with a NWPathMonitor instance that observes the interface name of the first currently satisfied network path. Our Swift code will call into `UpdateLastKnownDefaultRouteInterface`, so we can rely on that when it is set.
If for any reason the Swift machinery didn't work and we don't get any updates, here we also have some fallback logic: we try finding a hardcoded Wi-Fi interface called en0. If en0 is down, we fall back to cellular (pdp_ip0) as a last resort. This doesn't handle all edge cases like USB-Ethernet adapters or multiple Ethernet interfaces, but it is good enough to ensure connectivity isn't broken.
I tested this on iPhones and iPads running iOS 17.1 and it appears to work. Switching between different cellular plans on a dual SIM configuration also works (the interface name remains pdp_ip0).
Signed-off-by: Andrea Gottardo <andrea@tailscale.com>
Updates ENG-2513. Renames client metrics keys used on Windows for consistency with Apple platforms.
Signed-off-by: Andrea Gottardo <andrea@tailscale.com>
* ipn/localapi: add endpoint to handle APNS payloads
Fixes#9971. This adds a new `handle-push-message` local API endpoint. When an APNS payload is delivered to the main app, this endpoint can be used to forward the JSON body of the message to the backend, making a POST request.
cc @bradfitz
Signed-off-by: Andrea Gottardo <andrea@tailscale.com>
* Address comments from code review
Signed-off-by: Andrea Gottardo <andrea@tailscale.com>
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Signed-off-by: Andrea Gottardo <andrea@tailscale.com>
Andrea GottardoandGitHub
