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| 1 | +#![cfg(target_os = "windows")] |
| 2 | + |
| 3 | +use anyhow::Result; |
| 4 | +use std::fs::File; |
| 5 | +use std::io::Write; |
| 6 | + |
| 7 | +use windows::core::Interface; |
| 8 | +use windows::core::BSTR; |
| 9 | +use windows::Win32::Foundation::VARIANT_TRUE; |
| 10 | +use windows::Win32::NetworkManagement::WindowsFirewall::INetFwPolicy2; |
| 11 | +use windows::Win32::NetworkManagement::WindowsFirewall::INetFwRule3; |
| 12 | +use windows::Win32::NetworkManagement::WindowsFirewall::NetFwPolicy2; |
| 13 | +use windows::Win32::NetworkManagement::WindowsFirewall::NetFwRule; |
| 14 | +use windows::Win32::NetworkManagement::WindowsFirewall::NET_FW_ACTION_BLOCK; |
| 15 | +use windows::Win32::NetworkManagement::WindowsFirewall::NET_FW_IP_PROTOCOL_ANY; |
| 16 | +use windows::Win32::NetworkManagement::WindowsFirewall::NET_FW_PROFILE2_ALL; |
| 17 | +use windows::Win32::NetworkManagement::WindowsFirewall::NET_FW_RULE_DIR_OUT; |
| 18 | +use windows::Win32::System::Com::CoCreateInstance; |
| 19 | +use windows::Win32::System::Com::CoInitializeEx; |
| 20 | +use windows::Win32::System::Com::CoUninitialize; |
| 21 | +use windows::Win32::System::Com::CLSCTX_INPROC_SERVER; |
| 22 | +use windows::Win32::System::Com::COINIT_APARTMENTTHREADED; |
| 23 | + |
| 24 | +// This is the stable identifier we use to find/update the rule idempotently. |
| 25 | +// It intentionally does not change between installs. |
| 26 | +const OFFLINE_BLOCK_RULE_NAME: &str = "codex_sandbox_offline_block_outbound"; |
| 27 | + |
| 28 | +// Friendly text shown in the firewall UI. |
| 29 | +const OFFLINE_BLOCK_RULE_FRIENDLY: &str = "Codex Sandbox Offline - Block Outbound"; |
| 30 | + |
| 31 | +pub fn ensure_offline_outbound_block(offline_sid: &str, log: &mut File) -> Result<()> { |
| 32 | + let local_user_spec = format!("O:LSD:(A;;CC;;;{offline_sid})"); |
| 33 | + |
| 34 | + let hr = unsafe { CoInitializeEx(None, COINIT_APARTMENTTHREADED) }; |
| 35 | + if hr.is_err() { |
| 36 | + return Err(anyhow::anyhow!("CoInitializeEx failed: {hr:?}")); |
| 37 | + } |
| 38 | + |
| 39 | + let result = unsafe { |
| 40 | + (|| -> Result<()> { |
| 41 | + let policy: INetFwPolicy2 = CoCreateInstance(&NetFwPolicy2, None, CLSCTX_INPROC_SERVER) |
| 42 | + .map_err(|e| anyhow::anyhow!("CoCreateInstance NetFwPolicy2: {e:?}"))?; |
| 43 | + let rules = policy |
| 44 | + .Rules() |
| 45 | + .map_err(|e| anyhow::anyhow!("INetFwPolicy2::Rules: {e:?}"))?; |
| 46 | + |
| 47 | + // Block all outbound IP protocols for this user. |
| 48 | + ensure_block_rule( |
| 49 | + &rules, |
| 50 | + OFFLINE_BLOCK_RULE_NAME, |
| 51 | + OFFLINE_BLOCK_RULE_FRIENDLY, |
| 52 | + NET_FW_IP_PROTOCOL_ANY.0, |
| 53 | + &local_user_spec, |
| 54 | + offline_sid, |
| 55 | + log, |
| 56 | + )?; |
| 57 | + Ok(()) |
| 58 | + })() |
| 59 | + }; |
| 60 | + |
| 61 | + unsafe { |
| 62 | + CoUninitialize(); |
| 63 | + } |
| 64 | + result |
| 65 | +} |
| 66 | + |
| 67 | +fn ensure_block_rule( |
| 68 | + rules: &windows::Win32::NetworkManagement::WindowsFirewall::INetFwRules, |
| 69 | + internal_name: &str, |
| 70 | + friendly_desc: &str, |
| 71 | + protocol: i32, |
| 72 | + local_user_spec: &str, |
| 73 | + offline_sid: &str, |
| 74 | + log: &mut File, |
| 75 | +) -> Result<()> { |
| 76 | + let name = BSTR::from(internal_name); |
| 77 | + let rule: INetFwRule3 = match unsafe { rules.Item(&name) } { |
| 78 | + Ok(existing) => existing |
| 79 | + .cast() |
| 80 | + .map_err(|e| anyhow::anyhow!("cast existing firewall rule to INetFwRule3: {e:?}"))?, |
| 81 | + Err(_) => { |
| 82 | + let new_rule: INetFwRule3 = |
| 83 | + unsafe { CoCreateInstance(&NetFwRule, None, CLSCTX_INPROC_SERVER) } |
| 84 | + .map_err(|e| anyhow::anyhow!("CoCreateInstance NetFwRule: {e:?}"))?; |
| 85 | + unsafe { new_rule.SetName(&name) }.map_err(|e| anyhow::anyhow!("SetName: {e:?}"))?; |
| 86 | + // Set all properties before adding the rule so we don't leave half-configured rules. |
| 87 | + configure_rule( |
| 88 | + &new_rule, |
| 89 | + friendly_desc, |
| 90 | + protocol, |
| 91 | + local_user_spec, |
| 92 | + offline_sid, |
| 93 | + )?; |
| 94 | + unsafe { rules.Add(&new_rule) }.map_err(|e| anyhow::anyhow!("Rules::Add: {e:?}"))?; |
| 95 | + new_rule |
| 96 | + } |
| 97 | + }; |
| 98 | + |
| 99 | + // Always re-apply fields to keep the setup idempotent. |
| 100 | + configure_rule(&rule, friendly_desc, protocol, local_user_spec, offline_sid)?; |
| 101 | + |
| 102 | + log_line( |
| 103 | + log, |
| 104 | + &format!( |
| 105 | + "firewall rule configured name={internal_name} protocol={protocol} LocalUserAuthorizedList={local_user_spec}" |
| 106 | + ), |
| 107 | + )?; |
| 108 | + Ok(()) |
| 109 | +} |
| 110 | + |
| 111 | +fn configure_rule( |
| 112 | + rule: &INetFwRule3, |
| 113 | + friendly_desc: &str, |
| 114 | + protocol: i32, |
| 115 | + local_user_spec: &str, |
| 116 | + offline_sid: &str, |
| 117 | +) -> Result<()> { |
| 118 | + unsafe { |
| 119 | + rule.SetDescription(&BSTR::from(friendly_desc)) |
| 120 | + .map_err(|e| anyhow::anyhow!("SetDescription: {e:?}"))?; |
| 121 | + rule.SetDirection(NET_FW_RULE_DIR_OUT) |
| 122 | + .map_err(|e| anyhow::anyhow!("SetDirection: {e:?}"))?; |
| 123 | + rule.SetAction(NET_FW_ACTION_BLOCK) |
| 124 | + .map_err(|e| anyhow::anyhow!("SetAction: {e:?}"))?; |
| 125 | + rule.SetEnabled(VARIANT_TRUE) |
| 126 | + .map_err(|e| anyhow::anyhow!("SetEnabled: {e:?}"))?; |
| 127 | + rule.SetProfiles(NET_FW_PROFILE2_ALL.0) |
| 128 | + .map_err(|e| anyhow::anyhow!("SetProfiles: {e:?}"))?; |
| 129 | + rule.SetProtocol(protocol) |
| 130 | + .map_err(|e| anyhow::anyhow!("SetProtocol: {e:?}"))?; |
| 131 | + rule.SetLocalUserAuthorizedList(&BSTR::from(local_user_spec)) |
| 132 | + .map_err(|e| anyhow::anyhow!("SetLocalUserAuthorizedList: {e:?}"))?; |
| 133 | + } |
| 134 | + |
| 135 | + // Read-back verification: ensure we actually wrote the expected SID scope. |
| 136 | + let actual = unsafe { rule.LocalUserAuthorizedList() } |
| 137 | + .map_err(|e| anyhow::anyhow!("LocalUserAuthorizedList (read-back): {e:?}"))?; |
| 138 | + let actual_str = actual.to_string(); |
| 139 | + if !actual_str.contains(offline_sid) { |
| 140 | + anyhow::bail!( |
| 141 | + "offline firewall rule user scope mismatch: expected SID {offline_sid}, got {actual_str}" |
| 142 | + ); |
| 143 | + } |
| 144 | + Ok(()) |
| 145 | +} |
| 146 | + |
| 147 | +fn log_line(log: &mut File, msg: &str) -> Result<()> { |
| 148 | + let ts = chrono::Utc::now().to_rfc3339(); |
| 149 | + writeln!(log, "[{ts}] {msg}")?; |
| 150 | + Ok(()) |
| 151 | +} |
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