/// <summary>
/// Constructs a hive proxy from a hive login.
/// </summary>
/// <param name="hiveLogin">The hive login.</param>
/// <param name="nodeProxyCreator">
/// The optional application supplied function that creates a node proxy
/// given the node name, public address or FQDN, private address, and
/// the node definition.
/// </param>
/// <param name="appendLog">Optionally have logs appended to an existing log file rather than creating a new one.</param>
/// <param name="useBootstrap">
/// Optionally specifies that the instance should use the HiveMQ client
/// should directly eference to the HiveMQ cluster nodes for broadcasting
/// proxy update messages rather than routing traffic through the <b>private</b>
/// traffic manager. This is used internally to resolve chicken-and-the-egg
/// dilemmas for the traffic manager and proxy implementations that rely on
/// HiveMQ messaging.
/// </param>
/// <param name="defaultRunOptions">
/// Optionally specifies the <see cref="RunOptions"/> to be assigned to the
/// <see cref="SshProxy{TMetadata}.DefaultRunOptions"/> property for the
/// nodes managed by the hive proxy. This defaults to <see cref="RunOptions.None"/>.
/// </param>
/// <remarks>
/// The <paramref name="nodeProxyCreator"/> function will be called for each node in
/// the hive definition giving the application the chance to create the management
/// proxy using the node's SSH credentials and also to specify logging. A default
/// creator that doesn't initialize SSH credentials and logging is used if a <c>null</c>
/// argument is passed.
/// </remarks>
public HiveProxy(
HiveLogin hiveLogin,
Func <string, string, IPAddress, bool, SshProxy <NodeDefinition> > nodeProxyCreator = null,
bool appendLog = false,
bool useBootstrap = false,
RunOptions defaultRunOptions = RunOptions.None)
: this(hiveLogin.Definition, nodeProxyCreator, appendLog : appendLog, useBootstrap : useBootstrap, defaultRunOptions : defaultRunOptions)
{
Covenant.Requires <ArgumentNullException>(hiveLogin != null);
this.HiveLogin = hiveLogin;
// This ensures that the local machine is initialized properly for the login.
HiveHelper.InitLogin(hiveLogin);
}
/// <summary>
/// Called internally by <see cref="HiveHelper.OpenHiveRemote(DebugSecrets, DebugConfigs, string, bool)"/>
/// to create any requested Vault and Consul credentials and add them to the dictionary.
/// </summary>
/// <param name="hive">The attached hive.</param>
/// <param name="hiveLogin">The hive login.</param>
internal void Realize(HiveProxy hive, HiveLogin hiveLogin)
{
this.hiveLogin = hiveLogin;
HiveCredentials credentials;
foreach (var request in credentialRequests)
{
switch (request.Type)
{
case CredentialType.VaultToken:
// Serialize the credentials as JSON and persist.
credentials = HiveCredentials.FromVaultToken(request.Token);
Add(request.SecretName, NeonHelper.JsonSerialize(credentials, Formatting.Indented));
break;
case CredentialType.VaultAppRole:
// Serialize the credentials as JSON and persist.
credentials = VaultClient.GetAppRoleCredentialsAsync(request.RoleName).Result;
Add(request.SecretName, NeonHelper.JsonSerialize(credentials, Formatting.Indented));
break;
case CredentialType.ConsulToken:
// $todo(jeff.lill): Implement this.
break;
}
}
}
/// <summary>
/// Ensures that a hive VPN connection is established and healthy.
/// </summary>
/// <param name="hiveLogin">The hive login.</param>
/// <param name="timeoutSeconds">Maximum seconds to wait for the VPN connection (defaults to 120 seconds).</param>
/// <param name="onStatus">Optional callback that will be passed a status string.</param>
/// <param name="onError">Optional callback that will be passed a error string.</param>
/// <param name="show">
/// Optionally prints the OpenVPN connection status to the console for connection
/// debugging purposes.
/// </param>
/// <returns><c>true</c> if the connection was established (or has already been established).</returns>
/// <exception cref="TimeoutException">
/// Thrown if the VPN connection could not be established before the timeout expired.
/// </exception>
/// <exception cref="Exception">
/// Thrown if the VPN connection is unhealthy.
/// </exception>
public static void VpnOpen(HiveLogin hiveLogin, int timeoutSeconds = 120, Action <string> onStatus = null, Action <string> onError = null, bool show = false)
{
Covenant.Requires <ArgumentNullException>(hiveLogin != null);
var vpnClient = VpnGetClient(hiveLogin.HiveName);
string message;
if (vpnClient != null)
{
if (show)
{
throw new HiveException("A VPN connection already exists for this hive.");
}
switch (vpnClient.State)
{
case VpnState.Healthy:
return;
case VpnState.Unhealthy:
message = $"[{hiveLogin.HiveName}] VPN connection is unhealthy.";
onError?.Invoke(message);
throw new Exception(message);
case VpnState.Connecting:
onStatus?.Invoke($"Connecting [{hiveLogin.HiveName}] VPN...");
try
{
NeonHelper.WaitFor(
() =>
{
vpnClient = VpnGetClient(hiveLogin.HiveName);
if (vpnClient != null)
{
return(vpnClient.State == VpnState.Healthy);
}
else
{
return(false);
}
},
TimeSpan.FromSeconds(timeoutSeconds));
}
catch (TimeoutException)
{
throw new TimeoutException($"VPN connection could not be established within [{timeoutSeconds}] seconds.");
}
return;
default:
throw new NotImplementedException();
}
}
// Initialize the VPN folder for the hive (deleting any
// existing folder).
var clientFolder = GetVpnClientFolder(hiveLogin.HiveName);
NeonHelper.DeleteFolderContents(clientFolder);
Directory.CreateDirectory(clientFolder);
File.WriteAllText(Path.Combine(clientFolder, "ca.crt"), hiveLogin.VpnCredentials.CaCert);
File.WriteAllText(Path.Combine(clientFolder, "client.crt"), hiveLogin.VpnCredentials.UserCert);
File.WriteAllText(Path.Combine(clientFolder, "client.key"), hiveLogin.VpnCredentials.UserKey);
File.WriteAllText(Path.Combine(clientFolder, "ta.key"), hiveLogin.VpnCredentials.TaKey);
// VPN servers are reached via the manager load balancer or router
// using the forwarding port rule assigned to each manager node.
Covenant.Assert(hiveLogin.Definition.Network.ManagerPublicAddress != null, "Manager router address is required.");
var servers = string.Empty;
var firstServer = true;
foreach (var manager in hiveLogin.Definition.Managers)
{
if (firstServer)
{
firstServer = false;
}
else
{
servers += "\r\n";
}
servers += $"remote {hiveLogin.Definition.Network.ManagerPublicAddress} {manager.VpnFrontendPort}";
}
// Generate the client side configuration.
var config =
$@"##############################################
# Sample client-side OpenVPN 2.0 config file #
# for connecting to multi-client server. #
# #
# This configuration can be used by multiple #
# clients, however each client should have #
# its own cert and key files. #
# #
# On Windows, you might want to rename this #
# file so it has a .ovpn extension #
##############################################
# Specify that we are a client and that we
# will be pulling certain config file directives
# from the server.
client
# Use the same setting as you are using on
# the server.
# On most systems, the VPN will not function
# unless you partially or fully disable
# the firewall for the TUN/TAP interface.
;dev tap
dev tun
# Windows needs the TAP-Windows adapter name
# from the Network Connections panel
# if you have more than one. On XP SP2,
# you may need to disable the firewall
# for the TAP adapter.
;dev-node MyTap
# Are we connecting to a TCP or
# UDP server? Use the same setting as
# on the server.
proto tcp
;proto udp
# The hostname/IP and port of the server.
# You can have multiple remote entries
# to load balance between the servers.
{servers}
# Choose a random host from the remote
# list for load-balancing. Otherwise
# try hosts in the order specified.
remote-random
# Keep trying indefinitely to resolve the
# host name of the OpenVPN server. Very useful
# on machines which are not permanently connected
# to the internet such as laptops.
resolv-retry infinite
# Most clients don't need to bind to
# a specific local port number.
nobind
# Downgrade privileges after initialization (non-Windows only)
;user nobody
;group nobody
# Try to preserve some state across restarts.
;persist-key
;persist-tun
# If you are connecting through an
# HTTP proxy to reach the actual OpenVPN
# server, put the proxy server/IP and
# port number here. See the man page
# if your proxy server requires
# authentication.
;http-proxy-retry # retry on connection failures
;http-proxy [proxy server] [proxy port #]
# Wireless networks often produce a lot
# of duplicate packets. Set this flag
# to silence duplicate packet warnings.
;mute-replay-warnings
# SSL/TLS parms.
# See the server config file for more
# description. It's best to use
# a separate .crt/.key file pair
# for each client. A single ca
# file can be used for all clients.
ca ""{EscapeWinBackslash(Path.Combine(clientFolder, "ca.crt"))}""
cert ""{EscapeWinBackslash(Path.Combine(clientFolder, "client.crt"))}""
key ""{EscapeWinBackslash(Path.Combine(clientFolder, "client.key"))}""
# Verify server certificate by checking
# that the certicate has the nsCertType
# field set to ""server"". This is an
# important precaution to protect against
# a potential attack discussed here:
# http://openvpn.net/howto.html#mitm
#
# To use this feature, you will need to generate
# your server certificates with the nsCertType
# field set to ""server"". The build-key-server
# script in the easy-rsa folder will do this.
remote-cert-tls server
# If a tls-auth key is used on the server
# then every client must also have the key.
tls-auth ""{EscapeWinBackslash(Path.Combine(clientFolder, "ta.key"))}"" 1
# Select a cryptographic cipher.
# If the cipher option is used on the server
# then you must also specify it here.
cipher AES-256-CBC
# Enable compression on the VPN link.
# Don't enable this unless it is also
# enabled in the server config file.
#
# We're not enabling this due to the
# VORACLE security vulnerablity:
#
# https://community.openvpn.net/openvpn/wiki/VORACLE
#
#comp-lzo
# Set log file verbosity.
verb 3
# Silence repeating messages
; mute 20
";
var configPath = Path.Combine(clientFolder, "client.conf");
var statusPath = Path.Combine(clientFolder, "status.txt");
var pidPath = Path.Combine(clientFolder, "pid");
File.WriteAllText(configPath, config.Replace("\r", string.Empty)); // Linux-style line endings
// Launch OpenVPN via a script to establish a connection.
var startInfo = new ProcessStartInfo("openvpn")
{
Arguments = $"--config \"{configPath}\" --status \"{statusPath}\" {VpnStatusSeconds}",
CreateNoWindow = !show,
};
// Write a script for manual debugging VPN purposes.
var scriptPath = Path.Combine(clientFolder, NeonHelper.IsWindows ? "open.cmd" : "open.sh");
File.WriteAllText(scriptPath, $"openvpn {startInfo.Arguments}");
// Add the default OpenVPN installation folder to the PATH
// environment variable if it's not present already.
if (NeonHelper.IsWindows)
{
var defaultOpenVpnFolder = @"C:\Program Files\OpenVPN\bin";
var path = Environment.GetEnvironmentVariable("PATH");
if (path.IndexOf(defaultOpenVpnFolder, StringComparison.InvariantCultureIgnoreCase) == -1)
{
Environment.SetEnvironmentVariable("PATH", $"{path};{defaultOpenVpnFolder}");
}
}
else if (NeonHelper.IsOSX)
{
throw new NotImplementedException("$todo(jeff.lill): Implement this.");
}
else
{
throw new NotSupportedException();
}
try
{
var process = Process.Start(startInfo);
File.WriteAllText(pidPath, $"{process.Id}");
// This detaches the OpenVPN process from the current process so OpenVPN
// will continue running after the current process terminates.
process.Dispose();
}
catch (Exception e)
{
NeonHelper.DeleteFolderContents(clientFolder);
throw new Exception($"*** ERROR: Cannot launch [OpenVPN]. Make sure OpenVPN is installed to its default folder or is on the PATH.", e);
}
// Wait for the VPN connection.
onStatus?.Invoke($"Connecting [{hiveLogin.HiveName}] VPN...");
// $hack(jeff.lill):
//
// Marcus had VPN problems on his workstation when logging into a hive.
// The VPN would appear to connect but the SSH connection would fail. The
// underlying issue turned out be that the Windows-TAP driver wasn't
// installed and the OpenVPN client failed to start.
//
// https://github.com/jefflill/NeonForge/issues/161
//
// I'm not entirely sure why my VPN health checks didn't detect this
// problem. I believe this may have occurred because the OpenVPN
// process hasn't yet terminated when I did the first health check
// and so it appeared healthy (a race condition).
//
// I'm going to hack around this by moving the 10sec delay
// from further down in this method to here so hopefully OpenVPN
// will terminate in time to detect the problem.
Thread.Sleep(TimeSpan.FromSeconds(10));
// Wait for the VPN to connect.
vpnClient = VpnGetClient(hiveLogin.HiveName);
if (vpnClient != null)
{
if (vpnClient.State == VpnState.Healthy)
{
onStatus?.Invoke($"VPN is connected");
return;
}
else if (vpnClient.State == VpnState.Unhealthy)
{
message = $"[{hiveLogin.HiveName}] VPN connection is unhealthy";
if (onError != null)
{
onError(message);
}
throw new Exception(message);
}
}
try
{
NeonHelper.WaitFor(
() =>
{
vpnClient = VpnGetClient(hiveLogin.HiveName);
if (vpnClient != null)
{
return(vpnClient.State == VpnState.Healthy);
}
else
{
return(false);
}
},
TimeSpan.FromSeconds(timeoutSeconds));
onStatus?.Invoke($"Connected to [{hiveLogin.HiveName}] VPN");
return;
}
catch (TimeoutException)
{
throw new TimeoutException($"VPN connection could not be established within [{timeoutSeconds}] seconds.");
}
}
/// <summary>
/// Called internally by <see cref="HiveHelper.OpenHiveRemote(DebugSecrets, DebugConfigs, string, bool)"/>
/// to create any requested configs and add them to the dictionary.
/// </summary>
/// <param name="hive">The attached hive.</param>
/// <param name="hiveLogin">The hive login.</param>
internal void Realize(HiveProxy hive, HiveLogin hiveLogin)
{
// This is a NOP because we already added all of the configs
// to the base dictionary in the [Add()] methods.
}
