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cdk-tailscale-bastion

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Deploys a AWS Bastion Host preconfigured for Tailscale access

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"use strict"; var _a; Object.defineProperty(exports, "__esModule", { value: true }); exports.TailscaleBastion = void 0; const JSII_RTTI_SYMBOL_1 = Symbol.for("jsii.rtti"); const aws_cdk_lib_1 = require("aws-cdk-lib"); const aws_ec2_1 = require("aws-cdk-lib/aws-ec2"); const constructs_1 = require("constructs"); class TailscaleBastion extends constructs_1.Construct { constructor(scope, id, props) { super(scope, id); const { tailscaleCredentials, vpc, availabilityZone, instanceName, subnetSelection, securityGroup, instanceType, additionalInit, incomingRoutes, advertiseRoute, cpuType, cachedInContext, ami, } = props; const authKeyCommand = this.computeTsKeyCli(tailscaleCredentials); const machineImage = ami ?? aws_ec2_1.MachineImage.latestAmazonLinux2023({ cpuType: cpuType ?? aws_ec2_1.AmazonLinuxCpuType.X86_64, cachedInContext: cachedInContext ?? false, }); const bastion = new aws_ec2_1.BastionHostLinux(this, 'BastionHost', { vpc, availabilityZone, instanceName: instanceName ?? 'BastionHostTailscale', securityGroup, instanceType, machineImage, subnetSelection: subnetSelection ?? { subnetType: aws_ec2_1.SubnetType.PUBLIC }, init: aws_ec2_1.CloudFormationInit.fromElements( // Configure IP forwarding aws_ec2_1.InitCommand.shellCommand('echo \'net.ipv4.ip_forward = 1\' | sudo tee -a /etc/sysctl.conf'), aws_ec2_1.InitCommand.shellCommand('echo \'net.ipv6.conf.all.forwarding = 1\' | sudo tee -a /etc/sysctl.conf'), aws_ec2_1.InitCommand.shellCommand('sudo sysctl -p /etc/sysctl.conf'), // Configure Amazon Linux 2023 DNS https://github.com/tailscale/tailscale/issues/7816 aws_ec2_1.InitCommand.shellCommand('mkdir -p /etc/systemd/resolved.conf.d'), aws_ec2_1.InitCommand.shellCommand('ln -sf /dev/null /etc/systemd/resolved.conf.d/resolved-disable-stub-listener.conf'), aws_ec2_1.InitCommand.shellCommand('ln -sf /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf'), // Install Tailscale aws_ec2_1.InitCommand.shellCommand('dnf config-manager --add-repo https://pkgs.tailscale.com/stable/amazon-linux/2023/tailscale.repo'), // Protect against a potential conflict with AWS activity aws_ec2_1.InitCommand.shellCommand('until dnf -y install tailscale ; do sleep 10s ; done'), aws_ec2_1.InitCommand.shellCommand('systemctl enable --now tailscaled'), aws_ec2_1.InitCommand.shellCommand(`echo TS_AUTHKEY=${authKeyCommand} >> /etc/environment`), aws_ec2_1.InitCommand.shellCommand(`source /etc/environment && tailscale up --authkey $TS_AUTHKEY --advertise-routes=${advertiseRoute ?? vpc.vpcCidrBlock} --accept-routes --accept-dns=false`), ...(additionalInit ?? [])), initOptions: {}, }); if (tailscaleCredentials.secretsManager) { tailscaleCredentials.secretsManager.secret.grantRead(bastion); } bastion.connections.allowFromAnyIpv4(aws_ec2_1.Port.udp(41641), 'Tailscale IPv4'); bastion.connections.allowFrom(aws_ec2_1.Peer.anyIpv6(), aws_ec2_1.Port.udp(41641), 'Tailscale IPv6'); const splitAddress = aws_cdk_lib_1.Fn.split('/', props.vpc.vpcCidrBlock, 2)[0]; const splitIp = aws_cdk_lib_1.Fn.split('.', splitAddress, 4); const dnsServer = `${splitIp[0]}.${splitIp[1]}.${splitIp[2]}.2`; new aws_cdk_lib_1.CfnOutput(this, 'Vpc-Dns-Nameserver', { value: dnsServer }); const stack = aws_cdk_lib_1.Stack.of(this); const domain = aws_cdk_lib_1.Token.isUnresolved(stack.region) ? 'compute.internal' : `${stack.region}.compute.internal`; new aws_cdk_lib_1.CfnOutput(this, 'Vpc-Dns-Domain', { value: domain }); for (const incomingRoute of incomingRoutes ?? []) { for (const subnet of vpc.privateSubnets) { new aws_ec2_1.CfnRoute(subnet, `TailscaleRoute-${incomingRoute}`, { routeTableId: subnet.routeTable.routeTableId, destinationCidrBlock: incomingRoute, instanceId: bastion.instanceId, }); } } this.bastion = bastion; } computeTsKeyCli(credentials) { if (credentials.unsafeString) { return credentials.unsafeString; } else if (credentials.secretsManager) { const sm = credentials.secretsManager; return `$(aws secretsmanager get-secret-value --region ${sm.secret.env.region} --secret-id ${sm.secret.secretArn} --query SecretString --output text | jq '."${sm.key}"')`; } else { throw new Error('No Tailscale credentials set'); } } } exports.TailscaleBastion = TailscaleBastion; _a = JSII_RTTI_SYMBOL_1; TailscaleBastion[_a] = { fqn: "cdk-tailscale-bastion.TailscaleBastion", version: "2.3.0" }; //# sourceMappingURL=data:application/json;base64,{"version":3,"file":"index.js","sourceRoot":"","sources":["../src/index.ts"],"names":[],"mappings":";;;;;AAAA,6CAA0D;AAC1D,iDAgB6B;AAE7B,2CAAuC;AAyGvC,MAAa,gBAAiB,SAAQ,sBAAS;IAE7C,YAAY,KAAgB,EAAE,EAAU,EAAE,KAA4B;QACpE,KAAK,CAAC,KAAK,EAAE,EAAE,CAAC,CAAC;QAEjB,MAAM,EACJ,oBAAoB,EACpB,GAAG,EACH,gBAAgB,EAChB,YAAY,EACZ,eAAe,EACf,aAAa,EACb,YAAY,EACZ,cAAc,EACd,cAAc,EACd,cAAc,EACd,OAAO,EACP,eAAe,EACf,GAAG,GACJ,GAAG,KAAK,CAAC;QAEV,MAAM,cAAc,GAAG,IAAI,CAAC,eAAe,CAAC,oBAAoB,CAAC,CAAC;QAClE,MAAM,YAAY,GAAG,GAAG,IAAI,sBAAY,CAAC,qBAAqB,CAAC;YAC7D,OAAO,EAAE,OAAO,IAAI,4BAAkB,CAAC,MAAM;YAC7C,eAAe,EAAE,eAAe,IAAI,KAAK;SAC1C,CAAC,CAAC;QAEH,MAAM,OAAO,GAAG,IAAI,0BAAgB,CAAC,IAAI,EAAE,aAAa,EAAE;YACxD,GAAG;YACH,gBAAgB;YAChB,YAAY,EAAE,YAAY,IAAI,sBAAsB;YACpD,aAAa;YACb,YAAY;YACZ,YAAY;YACZ,eAAe,EAAE,eAAe,IAAI,EAAE,UAAU,EAAE,oBAAU,CAAC,MAAM,EAAE;YACrE,IAAI,EAAE,4BAAkB,CAAC,YAAY;YACnC,0BAA0B;YAC1B,qBAAW,CAAC,YAAY,CAAC,iEAAiE,CAAC,EAC3F,qBAAW,CAAC,YAAY,CAAC,0EAA0E,CAAC,EACpG,qBAAW,CAAC,YAAY,CAAC,iCAAiC,CAAC;YAE3D,qFAAqF;YACrF,qBAAW,CAAC,YAAY,CAAC,uCAAuC,CAAC,EACjE,qBAAW,CAAC,YAAY,CAAC,mFAAmF,CAAC,EAC7G,qBAAW,CAAC,YAAY,CAAC,+DAA+D,CAAC;YAEzF,oBAAoB;YACpB,qBAAW,CAAC,YAAY,CAAC,kGAAkG,CAAC;YAC5H,yDAAyD;YACzD,qBAAW,CAAC,YAAY,CAAC,sDAAsD,CAAC,EAChF,qBAAW,CAAC,YAAY,CAAC,mCAAmC,CAAC,EAC7D,qBAAW,CAAC,YAAY,CAAC,mBAAmB,cAAc,sBAAsB,CAAC,EACjF,qBAAW,CAAC,YAAY,CAAC,oFAAoF,cAAc,IAAI,GAAG,CAAC,YAAY,qCAAqC,CAAC,EACrL,GAAG,CAAC,cAAc,IAAI,EAAE,CAAC,CAC1B;YACD,WAAW,EAAE,EAAE;SAChB,CAAC,CAAC;QAEH,IAAI,oBAAoB,CAAC,cAAc,EAAE,CAAC;YACxC,oBAAoB,CAAC,cAAc,CAAC,MAAM,CAAC,SAAS,CAAC,OAAO,CAAC,CAAC;QAChE,CAAC;QAED,OAAO,CAAC,WAAW,CAAC,gBAAgB,CAAC,cAAI,CAAC,GAAG,CAAC,KAAK,CAAC,EAAE,gBAAgB,CAAC,CAAC;QACxE,OAAO,CAAC,WAAW,CAAC,SAAS,CAAC,cAAI,CAAC,OAAO,EAAE,EAAE,cAAI,CAAC,GAAG,CAAC,KAAK,CAAC,EAAE,gBAAgB,CAAC,CAAC;QAEjF,MAAM,YAAY,GAAG,gBAAE,CAAC,KAAK,CAAC,GAAG,EAAE,KAAK,CAAC,GAAG,CAAC,YAAY,EAAE,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC;QACjE,MAAM,OAAO,GAAG,gBAAE,CAAC,KAAK,CAAC,GAAG,EAAE,YAAY,EAAE,CAAC,CAAC,CAAC;QAC/C,MAAM,SAAS,GAAG,GAAG,OAAO,CAAC,CAAC,CAAC,IAAI,OAAO,CAAC,CAAC,CAAC,IAAI,OAAO,CAAC,CAAC,CAAC,IAAI,CAAC;QAEhE,IAAI,uBAAS,CAAC,IAAI,EAAE,oBAAoB,EAAE,EAAE,KAAK,EAAE,SAAS,EAAE,CAAC,CAAC;QAEhE,MAAM,KAAK,GAAG,mBAAK,CAAC,EAAE,CAAC,IAAI,CAAC,CAAC;QAC7B,MAAM,MAAM,GAAG,mBAAK,CAAC,YAAY,CAAC,KAAK,CAAC,MAAM,CAAC,CAAC,CAAC,CAAC,kBAAkB,CAAC,CAAC,CAAC,GAAG,KAAK,CAAC,MAAM,mBAAmB,CAAC;QAE1G,IAAI,uBAAS,CAAC,IAAI,EAAE,gBAAgB,EAAE,EAAE,KAAK,EAAE,MAAM,EAAE,CAAC,CAAC;QAEzD,KAAK,MAAM,aAAa,IAAI,cAAc,IAAI,EAAE,EAAE,CAAC;YACjD,KAAK,MAAM,MAAM,IAAI,GAAG,CAAC,cAAc,EAAE,CAAC;gBACxC,IAAI,kBAAQ,CAAC,MAAM,EAAE,kBAAkB,aAAa,EAAE,EAAE;oBACtD,YAAY,EAAE,MAAM,CAAC,UAAU,CAAC,YAAY;oBAC5C,oBAAoB,EAAE,aAAa;oBACnC,UAAU,EAAE,OAAO,CAAC,UAAU;iBAC/B,CAAC,CAAC;YACL,CAAC;QACH,CAAC;QAED,IAAI,CAAC,OAAO,GAAG,OAAO,CAAC;IAEzB,CAAC;IAEO,eAAe,CAAC,WAAiC;QACvD,IAAI,WAAW,CAAC,YAAY,EAAE,CAAC;YAC7B,OAAO,WAAW,CAAC,YAAY,CAAC;QAClC,CAAC;aAAM,IAAI,WAAW,CAAC,cAAc,EAAE,CAAC;YACtC,MAAM,EAAE,GAAG,WAAW,CAAC,cAAc,CAAC;YACtC,OAAO,kDAAkD,EAAE,CAAC,MAAM,CAAC,GAAG,CAAC,MAAM,gBAAgB,EAAE,CAAC,MAAM,CAAC,SAAS,+CAA+C,EAAE,CAAC,GAAG,KAAK,CAAC;QAC7K,CAAC;aAAM,CAAC;YACN,MAAM,IAAI,KAAK,CAAC,8BAA8B,CAAC,CAAC;QAClD,CAAC;IACH,CAAC;;AAnGH,4CAoGC","sourcesContent":["import { CfnOutput, Fn, Stack, Token } from 'aws-cdk-lib';\nimport {\n  AmazonLinuxCpuType,\n  BastionHostLinux,\n  CfnRoute,\n  CloudFormationInit,\n  IMachineImage,\n  InitCommand,\n  InitElement,\n  InstanceType,\n  ISecurityGroup,\n  IVpc,\n  MachineImage,\n  Peer,\n  Port,\n  SubnetSelection,\n  SubnetType,\n} from 'aws-cdk-lib/aws-ec2';\nimport { ISecret } from 'aws-cdk-lib/aws-secretsmanager';\nimport { Construct } from 'constructs';\n\nexport interface SecretsManagerAuthKey {\n  /**\n  * Secret manager location where the tailscale auth key is stored. Must be in the standard key/value JSON format.\n  */\n  readonly secret: ISecret;\n  /**\n   * The key of the auth key value located within the provided secret.\n   */\n  readonly key: string;\n}\n\nexport interface TailscaleCredentials {\n  /**\n   * Fetches the Auth Key from secrets manager. This value will be fetched during bastion startup.\n   */\n  readonly secretsManager?: SecretsManagerAuthKey;\n  /**\n   * Provides an auth key as a plaintext string.\n   * This option will expose the auth key in your CDK template and should only be used with non-reusable keys.\n   * Potentially useful for DevOps runbooks and temporary instances.\n   *\n   * The `cachedInContext` configuration option might be relevant to you if you use this parameter.\n   */\n  readonly unsafeString?: string;\n}\n\nexport interface TailscaleBastionProps {\n  /**\n    * VPC to launch the instance in.\n    */\n  readonly vpc: IVpc;\n  /**\n   * Credential settings for the tailscale auth key. One type must be used.\n   * Ephemeral keys are recommended.\n   */\n  readonly tailscaleCredentials: TailscaleCredentials;\n  /**\n   * In which AZ to place the instance within the VPC.\n   *\n   * @default - Random zone.\n   */\n  readonly availabilityZone?: string;\n  /**\n   * The name of the instance.\n   *\n   * @default 'BastionHostTailscale'\n   */\n  readonly instanceName?: string;\n  /**\n   * Select the subnets to run the bastion host in.\n   * PUBLIC subnets are used by default to allow for a direct Tailscale connection. DERP nodes will be used in a private subnet.\n   *\n   * @default - PUBLIC subnets of the supplied VPC\n   */\n  readonly subnetSelection?: SubnetSelection;\n  /**\n   * Security Group to assign to this instance.\n   *\n   * @default - create new security group with no inbound and all outbound traffic allowed\n   */\n  readonly securityGroup?: ISecurityGroup;\n  /**\n   * Type of instance to launch.\n   *\n   * @default 't3.nano'\n   */\n  readonly instanceType?: InstanceType;\n  /**\n   *  CPU Type of the instance.\n   *\n   *  @default AmazonLinuxCpuType.X86_64\n   */\n  readonly cpuType?: AmazonLinuxCpuType;\n  /**\n   * Additional cloudformation init actions to perform during startup.\n   */\n  readonly additionalInit?: InitElement[];\n  /**\n   * List of incoming routes from Tailscale network. VPC route table will get these targets added.\n   *\n   * @default none\n   */\n  readonly incomingRoutes?: string[];\n  /**\n   * Advertise a custom route instead of using the VPC CIDR, used for Tailscale 4via6 support.\n   */\n  readonly advertiseRoute?: string;\n  /**\n   * Setting this to true will result in the Amazon Linux AMI being cached in `cdk.context.json` and prevent the instance being replaced when the image is updated.\n   * Enable this if you'd like to use non-reusable Tailscale keys, or you'd prefer the instance to remain stable.\n   * Keep in mind that the AMI will grow old over time and is it your responsibility to evict it from the context.\n   *\n   * @default false\n   */\n  readonly cachedInContext?: boolean;\n\n  /**\n   * If you want to completely opt out of getting the latest Amazon Linux AMI and instead need to specify one yourself, pass it in here.\n   * We'll use the one you specify instead of the default.\n   */\n  readonly ami?: IMachineImage;\n}\n\nexport class TailscaleBastion extends Construct {\n  readonly bastion: BastionHostLinux;\n  constructor(scope: Construct, id: string, props: TailscaleBastionProps) {\n    super(scope, id);\n\n    const {\n      tailscaleCredentials,\n      vpc,\n      availabilityZone,\n      instanceName,\n      subnetSelection,\n      securityGroup,\n      instanceType,\n      additionalInit,\n      incomingRoutes,\n      advertiseRoute,\n      cpuType,\n      cachedInContext,\n      ami,\n    } = props;\n\n    const authKeyCommand = this.computeTsKeyCli(tailscaleCredentials);\n    const machineImage = ami ?? MachineImage.latestAmazonLinux2023({\n      cpuType: cpuType ?? AmazonLinuxCpuType.X86_64,\n      cachedInContext: cachedInContext ?? false,\n    });\n\n    const bastion = new BastionHostLinux(this, 'BastionHost', {\n      vpc,\n      availabilityZone,\n      instanceName: instanceName ?? 'BastionHostTailscale',\n      securityGroup,\n      instanceType,\n      machineImage,\n      subnetSelection: subnetSelection ?? { subnetType: SubnetType.PUBLIC },\n      init: CloudFormationInit.fromElements(\n        // Configure IP forwarding\n        InitCommand.shellCommand('echo \\'net.ipv4.ip_forward = 1\\' | sudo tee -a /etc/sysctl.conf'),\n        InitCommand.shellCommand('echo \\'net.ipv6.conf.all.forwarding = 1\\' | sudo tee -a /etc/sysctl.conf'),\n        InitCommand.shellCommand('sudo sysctl -p /etc/sysctl.conf'),\n\n        // Configure Amazon Linux 2023 DNS https://github.com/tailscale/tailscale/issues/7816\n        InitCommand.shellCommand('mkdir -p /etc/systemd/resolved.conf.d'),\n        InitCommand.shellCommand('ln -sf /dev/null /etc/systemd/resolved.conf.d/resolved-disable-stub-listener.conf'),\n        InitCommand.shellCommand('ln -sf /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf'),\n\n        // Install Tailscale\n        InitCommand.shellCommand('dnf config-manager --add-repo https://pkgs.tailscale.com/stable/amazon-linux/2023/tailscale.repo'),\n        // Protect against a potential conflict with AWS activity\n        InitCommand.shellCommand('until dnf -y install tailscale ; do sleep 10s ; done'),\n        InitCommand.shellCommand('systemctl enable --now tailscaled'),\n        InitCommand.shellCommand(`echo TS_AUTHKEY=${authKeyCommand} >> /etc/environment`),\n        InitCommand.shellCommand(`source /etc/environment && tailscale up --authkey $TS_AUTHKEY --advertise-routes=${advertiseRoute ?? vpc.vpcCidrBlock} --accept-routes --accept-dns=false`),\n        ...(additionalInit ?? []),\n      ),\n      initOptions: {},\n    });\n\n    if (tailscaleCredentials.secretsManager) {\n      tailscaleCredentials.secretsManager.secret.grantRead(bastion);\n    }\n\n    bastion.connections.allowFromAnyIpv4(Port.udp(41641), 'Tailscale IPv4');\n    bastion.connections.allowFrom(Peer.anyIpv6(), Port.udp(41641), 'Tailscale IPv6');\n\n    const splitAddress = Fn.split('/', props.vpc.vpcCidrBlock, 2)[0];\n    const splitIp = Fn.split('.', splitAddress, 4);\n    const dnsServer = `${splitIp[0]}.${splitIp[1]}.${splitIp[2]}.2`;\n\n    new CfnOutput(this, 'Vpc-Dns-Nameserver', { value: dnsServer });\n\n    const stack = Stack.of(this);\n    const domain = Token.isUnresolved(stack.region) ? 'compute.internal' : `${stack.region}.compute.internal`;\n\n    new CfnOutput(this, 'Vpc-Dns-Domain', { value: domain });\n\n    for (const incomingRoute of incomingRoutes ?? []) {\n      for (const subnet of vpc.privateSubnets) {\n        new CfnRoute(subnet, `TailscaleRoute-${incomingRoute}`, {\n          routeTableId: subnet.routeTable.routeTableId,\n          destinationCidrBlock: incomingRoute,\n          instanceId: bastion.instanceId,\n        });\n      }\n    }\n\n    this.bastion = bastion;\n\n  }\n\n  private computeTsKeyCli(credentials: TailscaleCredentials) {\n    if (credentials.unsafeString) {\n      return credentials.unsafeString;\n    } else if (credentials.secretsManager) {\n      const sm = credentials.secretsManager;\n      return `$(aws secretsmanager get-secret-value --region ${sm.secret.env.region} --secret-id ${sm.secret.secretArn} --query SecretString --output text | jq '.\"${sm.key}\"')`;\n    } else {\n      throw new Error('No Tailscale credentials set');\n    }\n  }\n}"]}