| 1 | // Copyright (C) Microsoft Corporation. All rights reserved. |
| 2 | |
| 3 | #include "precomp.h" |
| 4 | #include "WslCoreTcpIpStateTracking.h" |
| 5 | |
| 6 | #include "WslCoreConfig.h" |
| 7 | #include "WslCoreFirewallSupport.h" |
| 8 | |
| 9 | // SyncFirewallState is only needed when running on a Windows build with the original Hyper-V Firewall API (shipped with Windows |
| 10 | // 11 22H2) later updates to the Hyper-V Firewall solve the below automatically |
| 11 | void wsl::core::networking::IpStateTracking::SyncFirewallState(const NetworkSettings& preferredNetwork) noexcept |
| 12 | try |
| 13 | { |
| 14 | // This function is used to update rules which are IP address based. These |
| 15 | // rules are updated whenever we detect IP address changes. |
| 16 | // If we have tracked IP addresses, we add or update the rules. |
| 17 | // If we no longer have any tracked IP addresses, we remove the rules. |
| 18 | // Currently, we add the following rules: |
| 19 | // -My IP loopback rule - allows traffic from my IP addresses |
| 20 | // -Local subnet rule - allows traffic from the local subnet |
| 21 | |
| 22 | if (FirewallVmCreatorId.has_value()) |
| 23 | { |
| 24 | // Obtain current set of IP addresses |
| 25 | std::set<EndpointIpAddress> currentIpAddresses; |
| 26 | if (!preferredNetwork.PreferredIpAddress.AddressString.empty()) |
| 27 | { |
| 28 | currentIpAddresses.insert(preferredNetwork.PreferredIpAddress); |
| 29 | } |
| 30 | for (const auto& ipAddress : preferredNetwork.IpAddresses) |
| 31 | { |
| 32 | currentIpAddresses.insert(ipAddress); |
| 33 | } |
| 34 | |
| 35 | // Only perform firewall update if the IP addresses have changed |
| 36 | if (currentIpAddresses != FirewallTrackedIpAddresses) |
| 37 | { |
| 38 | // Ensure COM state is properly initialized |
| 39 | const auto coInit = InitializeCOMState(); |
| 40 | const auto loopbackRuleId = MakeLoopbackFirewallRuleId(FirewallVmCreatorId.value()); |
| 41 | const auto localSubnetRuleId = MakeLocalSubnetFirewallRuleId(FirewallVmCreatorId.value()); |
| 42 | |
| 43 | // If we have no IP addresses, remove any existing rules |
| 44 | if (currentIpAddresses.empty()) |
| 45 | { |
| 46 | WSL_LOG("IpStateTracking::SyncFirewallState removing rules"); |
| 47 | |
| 48 | // Remove loopback rule |
| 49 | RemoveHyperVFirewallRule(loopbackRuleId); |
| 50 | |
| 51 | // Remove local subnet rule |
| 52 | RemoveHyperVFirewallRule(localSubnetRuleId); |
| 53 | } |
| 54 | else |
| 55 | { |
| 56 | // We have IP addresses - update the firewall rules |
| 57 | FirewallRuleConfiguration myIpLoopbackRule{MakeLoopbackFirewallRuleConfiguration(loopbackRuleId)}; |
| 58 | FirewallRuleConfiguration localSubnetRule{MakeLocalSubnetFirewallRuleConfiguration(localSubnetRuleId)}; |
| 59 | |
| 60 | // Iterate through IP Addresses to populate myIP loopback addresses and local subnet addresses |
| 61 | std::set<std::wstring> localSubnetPrefixes; |
| 62 | for (const auto& ipAddress : currentIpAddresses) |
| 63 | { |
| 64 | myIpLoopbackRule.RemoteAddresses.emplace_back(wil::make_bstr(ipAddress.AddressString.c_str())); |
| 65 | localSubnetPrefixes.insert(ipAddress.GetPrefix()); |
| 66 | } |
| 67 | |
| 68 | // Convert from set of wstring to vector of unique_bstr |
| 69 | for (const auto& subnet : localSubnetPrefixes) |
| 70 | { |
| 71 | localSubnetRule.RemoteAddresses.emplace_back(wil::make_bstr(subnet.c_str())); |
| 72 | } |
| 73 | |
| 74 | // Add my IP loopback rule |
| 75 | WSL_LOG("IpStateTracking::SyncFirewallState Adding my IP loopback rule"); |
| 76 | AddHyperVFirewallRule(FirewallVmCreatorId.value(), myIpLoopbackRule); |
| 77 | |
| 78 | // Add local subnet rule |
| 79 | WSL_LOG("IpStateTracking::SyncFirewallState Adding local subnet rule"); |
| 80 | AddHyperVFirewallRule(FirewallVmCreatorId.value(), localSubnetRule); |
| 81 | } |
| 82 | |
| 83 | // Swap to the tracked set of IP addresses after we have performed all of the updates |
| 84 | std::swap(FirewallTrackedIpAddresses, currentIpAddresses); |
| 85 | } |
| 86 | else |
| 87 | { |
| 88 | WSL_LOG( |
| 89 | "IpStateTracking::SyncFirewallState - FirewallTrackedIpAddresses is synced with the preferredNetwork", |
| 90 | TraceLoggingValue(FirewallTrackedIpAddresses.size(), "FirewallTrackedIpAddresses.size")); |
| 91 | } |
| 92 | } |
| 93 | else |
| 94 | { |
| 95 | WSL_LOG("IpStateTracking::SyncFirewallState - no FirewallVmCreatorId"); |
| 96 | } |
| 97 | } |
| 98 | CATCH_LOG() |