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@aws-cdk/aws-ec2

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The CDK Construct Library for AWS::EC2

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"use strict"; var _a; Object.defineProperty(exports, "__esModule", { value: true }); exports.SecurityGroup = void 0; const jsiiDeprecationWarnings = require("../.warnings.jsii.js"); const JSII_RTTI_SYMBOL_1 = Symbol.for("jsii.rtti"); const cxschema = require("@aws-cdk/cloud-assembly-schema"); const core_1 = require("@aws-cdk/core"); const connections_1 = require("./connections"); const ec2_generated_1 = require("./ec2.generated"); const peer_1 = require("./peer"); const port_1 = require("./port"); const SECURITY_GROUP_SYMBOL = Symbol.for('@aws-cdk/iam.SecurityGroup'); const SECURITY_GROUP_DISABLE_INLINE_RULES_CONTEXT_KEY = '@aws-cdk/aws-ec2.securityGroupDisableInlineRules'; /** * A SecurityGroup that is not created in this template */ class SecurityGroupBase extends core_1.Resource { constructor(scope, id, props) { super(scope, id, props); this.canInlineRule = false; this.connections = new connections_1.Connections({ securityGroups: [this] }); this.peerAsTokenCount = 0; Object.defineProperty(this, SECURITY_GROUP_SYMBOL, { value: true }); } /** * Return whether the indicated object is a security group */ static isSecurityGroup(x) { return SECURITY_GROUP_SYMBOL in x; } get uniqueId() { return core_1.Names.nodeUniqueId(this.node); } addIngressRule(peer, connection, description, remoteRule) { if (description === undefined) { description = `from ${peer.uniqueId}:${connection}`; } const [scope, id] = this.determineRuleScope(peer, connection, 'from', remoteRule); // Skip duplicates if (scope.node.tryFindChild(id) === undefined) { new ec2_generated_1.CfnSecurityGroupIngress(scope, id, { groupId: this.securityGroupId, ...peer.toIngressRuleConfig(), ...connection.toRuleJson(), description, }); } } addEgressRule(peer, connection, description, remoteRule) { if (description === undefined) { description = `to ${peer.uniqueId}:${connection}`; } const [scope, id] = this.determineRuleScope(peer, connection, 'to', remoteRule); // Skip duplicates if (scope.node.tryFindChild(id) === undefined) { new ec2_generated_1.CfnSecurityGroupEgress(scope, id, { groupId: this.securityGroupId, ...peer.toEgressRuleConfig(), ...connection.toRuleJson(), description, }); } } toIngressRuleConfig() { return { sourceSecurityGroupId: this.securityGroupId }; } toEgressRuleConfig() { return { destinationSecurityGroupId: this.securityGroupId }; } /** * Determine where to parent a new ingress/egress rule * * A SecurityGroup rule is parented under the group it's related to, UNLESS * we're in a cross-stack scenario with another Security Group. In that case, * we respect the 'remoteRule' flag and will parent under the other security * group. * * This is necessary to avoid cyclic dependencies between stacks, since both * ingress and egress rules will reference both security groups, and a naive * parenting will lead to the following situation: * * ╔════════════════════╗ ╔════════════════════╗ * ║ ┌───────────┐ ║ ║ ┌───────────┐ ║ * ║ │ GroupA │◀────╬─┐ ┌───╬───▶│ GroupB │ ║ * ║ └───────────┘ ║ │ │ ║ └───────────┘ ║ * ║ ▲ ║ │ │ ║ ▲ ║ * ║ │ ║ │ │ ║ │ ║ * ║ │ ║ │ │ ║ │ ║ * ║ ┌───────────┐ ║ └───┼───╬────┌───────────┐ ║ * ║ │ EgressA │─────╬─────┘ ║ │ IngressB │ ║ * ║ └───────────┘ ║ ║ └───────────┘ ║ * ║ ║ ║ ║ * ╚════════════════════╝ ╚════════════════════╝ * * By having the ability to switch the parent, we avoid the cyclic reference by * keeping all rules in a single stack. * * If this happens, we also have to change the construct ID, because * otherwise we might have two objects with the same ID if we have * multiple reversed security group relationships. * * ╔═══════════════════════════════════╗ * ║┌───────────┐ ║ * ║│ GroupB │ ║ * ║└───────────┘ ║ * ║ ▲ ║ * ║ │ ┌───────────┐ ║ * ║ ├────"from A"──│ IngressB │ ║ * ║ │ └───────────┘ ║ * ║ │ ┌───────────┐ ║ * ║ ├─────"to B"───│ EgressA │ ║ * ║ │ └───────────┘ ║ * ║ │ ┌───────────┐ ║ * ║ └─────"to B"───│ EgressC │ ║ <-- oops * ║ └───────────┘ ║ * ╚═══════════════════════════════════╝ */ determineRuleScope(peer, connection, fromTo, remoteRule) { if (remoteRule && SecurityGroupBase.isSecurityGroup(peer) && differentStacks(this, peer)) { // Reversed const reversedFromTo = fromTo === 'from' ? 'to' : 'from'; return [peer, `${this.uniqueId}:${connection} ${reversedFromTo}`]; } else { // Regular (do old ID escaping to in order to not disturb existing deployments) return [this, `${fromTo} ${this.renderPeer(peer)}:${connection}`.replace('/', '_')]; } } renderPeer(peer) { if (core_1.Token.isUnresolved(peer.uniqueId)) { // Need to return a unique value each time a peer // is an unresolved token, else the duplicate skipper // in `sg.addXxxRule` can detect unique rules as duplicates return this.peerAsTokenCount++ ? `'{IndirectPeer${this.peerAsTokenCount}}'` : '{IndirectPeer}'; } else { return peer.uniqueId; } } } function differentStacks(group1, group2) { return core_1.Stack.of(group1) !== core_1.Stack.of(group2); } /** * Creates an Amazon EC2 security group within a VPC. * * Security Groups act like a firewall with a set of rules, and are associated * with any AWS resource that has or creates Elastic Network Interfaces (ENIs). * A typical example of a resource that has a security group is an Instance (or * Auto Scaling Group of instances) * * If you are defining new infrastructure in CDK, there is a good chance you * won't have to interact with this class at all. Like IAM Roles, Security * Groups need to exist to control access between AWS resources, but CDK will * automatically generate and populate them with least-privilege permissions * for you so you can concentrate on your business logic. * * All Constructs that require Security Groups will create one for you if you * don't specify one at construction. After construction, you can selectively * allow connections to and between constructs via--for example-- the `instance.connections` * object. Think of it as "allowing connections to your instance", rather than * "adding ingress rules a security group". See the [Allowing * Connections](https://docs.aws.amazon.com/cdk/api/latest/docs/aws-ec2-readme.html#allowing-connections) * section in the library documentation for examples. * * Direct manipulation of the Security Group through `addIngressRule` and * `addEgressRule` is possible, but mutation through the `.connections` object * is recommended. If you peer two constructs with security groups this way, * appropriate rules will be created in both. * * If you have an existing security group you want to use in your CDK application, * you would import it like this: * * ```ts * const securityGroup = ec2.SecurityGroup.fromSecurityGroupId(this, 'SG', 'sg-12345', { * mutable: false * }); * ``` */ class SecurityGroup extends SecurityGroupBase { constructor(scope, id, props) { super(scope, id, { physicalName: props.securityGroupName, }); this.directIngressRules = []; this.directEgressRules = []; try { jsiiDeprecationWarnings._aws_cdk_aws_ec2_SecurityGroupProps(props); } catch (error) { if (process.env.JSII_DEBUG !== "1" && error.name === "DeprecationError") { Error.captureStackTrace(error, SecurityGroup); } throw error; } const groupDescription = props.description || this.node.path; this.allowAllOutbound = props.allowAllOutbound !== false; this.disableInlineRules = props.disableInlineRules !== undefined ? !!props.disableInlineRules : !!this.node.tryGetContext(SECURITY_GROUP_DISABLE_INLINE_RULES_CONTEXT_KEY); this.securityGroup = new ec2_generated_1.CfnSecurityGroup(this, 'Resource', { groupName: this.physicalName, groupDescription, securityGroupIngress: core_1.Lazy.any({ produce: () => this.directIngressRules }, { omitEmptyArray: true }), securityGroupEgress: core_1.Lazy.any({ produce: () => this.directEgressRules }, { omitEmptyArray: true }), vpcId: props.vpc.vpcId, }); this.securityGroupId = this.securityGroup.attrGroupId; this.securityGroupVpcId = this.securityGroup.attrVpcId; this.securityGroupName = this.securityGroup.ref; this.addDefaultEgressRule(); } /** * Look up a security group by id. * * @deprecated Use `fromLookupById()` instead */ static fromLookup(scope, id, securityGroupId) { try { jsiiDeprecationWarnings.print("@aws-cdk/aws-ec2.SecurityGroup#fromLookup", "Use `fromLookupById()` instead"); } catch (error) { if (process.env.JSII_DEBUG !== "1" && error.name === "DeprecationError") { Error.captureStackTrace(error, this.fromLookup); } throw error; } return this.fromLookupAttributes(scope, id, { securityGroupId }); } /** * Look up a security group by id. */ static fromLookupById(scope, id, securityGroupId) { return this.fromLookupAttributes(scope, id, { securityGroupId }); } /** * Look up a security group by name. */ static fromLookupByName(scope, id, securityGroupName, vpc) { try { jsiiDeprecationWarnings._aws_cdk_aws_ec2_IVpc(vpc); } catch (error) { if (process.env.JSII_DEBUG !== "1" && error.name === "DeprecationError") { Error.captureStackTrace(error, this.fromLookupByName); } throw error; } return this.fromLookupAttributes(scope, id, { securityGroupName, vpc }); } /** * Import an existing security group into this app. * * This method will assume that the Security Group has a rule in it which allows * all outbound traffic, and so will not add egress rules to the imported Security * Group (only ingress rules). * * If your existing Security Group needs to have egress rules added, pass the * `allowAllOutbound: false` option on import. */ static fromSecurityGroupId(scope, id, securityGroupId, options = {}) { try { jsiiDeprecationWarnings._aws_cdk_aws_ec2_SecurityGroupImportOptions(options); } catch (error) { if (process.env.JSII_DEBUG !== "1" && error.name === "DeprecationError") { Error.captureStackTrace(error, this.fromSecurityGroupId); } throw error; } class MutableImport extends SecurityGroupBase { constructor() { super(...arguments); this.securityGroupId = securityGroupId; this.allowAllOutbound = options.allowAllOutbound ?? true; } addEgressRule(peer, connection, description, remoteRule) { // Only if allowAllOutbound has been disabled if (options.allowAllOutbound === false) { super.addEgressRule(peer, connection, description, remoteRule); } } } class ImmutableImport extends SecurityGroupBase { constructor() { super(...arguments); this.securityGroupId = securityGroupId; this.allowAllOutbound = options.allowAllOutbound ?? true; } addEgressRule(_peer, _connection, _description, _remoteRule) { // do nothing } addIngressRule(_peer, _connection, _description, _remoteRule) { // do nothing } } return options.mutable !== false ? new MutableImport(scope, id) : new ImmutableImport(scope, id); } /** * Look up a security group. */ static fromLookupAttributes(scope, id, options) { if (core_1.Token.isUnresolved(options.securityGroupId) || core_1.Token.isUnresolved(options.securityGroupName) || core_1.Token.isUnresolved(options.vpc?.vpcId)) { throw new Error('All arguments to look up a security group must be concrete (no Tokens)'); } const attributes = core_1.ContextProvider.getValue(scope, { provider: cxschema.ContextProvider.SECURITY_GROUP_PROVIDER, props: { securityGroupId: options.securityGroupId, securityGroupName: options.securityGroupName, vpcId: options.vpc?.vpcId, }, dummyValue: { securityGroupId: 'sg-12345', allowAllOutbound: true, }, }).value; return SecurityGroup.fromSecurityGroupId(scope, id, attributes.securityGroupId, { allowAllOutbound: attributes.allowAllOutbound, mutable: true, }); } addIngressRule(peer, connection, description, remoteRule) { try { jsiiDeprecationWarnings._aws_cdk_aws_ec2_IPeer(peer); jsiiDeprecationWarnings._aws_cdk_aws_ec2_Port(connection); } catch (error) { if (process.env.JSII_DEBUG !== "1" && error.name === "DeprecationError") { Error.captureStackTrace(error, this.addIngressRule); } throw error; } if (!peer.canInlineRule || !connection.canInlineRule || this.disableInlineRules) { super.addIngressRule(peer, connection, description, remoteRule); return; } if (description === undefined) { description = `from ${peer.uniqueId}:${connection}`; } this.addDirectIngressRule({ ...peer.toIngressRuleConfig(), ...connection.toRuleJson(), description, }); } addEgressRule(peer, connection, description, remoteRule) { try { jsiiDeprecationWarnings._aws_cdk_aws_ec2_IPeer(peer); jsiiDeprecationWarnings._aws_cdk_aws_ec2_Port(connection); } catch (error) { if (process.env.JSII_DEBUG !== "1" && error.name === "DeprecationError") { Error.captureStackTrace(error, this.addEgressRule); } throw error; } if (this.allowAllOutbound) { // In the case of "allowAllOutbound", we don't add any more rules. There // is only one rule which allows all traffic and that subsumes any other // rule. if (!remoteRule) { // Warn only if addEgressRule() was explicitely called core_1.Annotations.of(this).addWarning('Ignoring Egress rule since \'allowAllOutbound\' is set to true; To add customized rules, set allowAllOutbound=false on the SecurityGroup'); } return; } else { // Otherwise, if the bogus rule exists we can now remove it because the // presence of any other rule will get rid of EC2's implicit "all // outbound" rule anyway. this.removeNoTrafficRule(); } if (!peer.canInlineRule || !connection.canInlineRule || this.disableInlineRules) { super.addEgressRule(peer, connection, description, remoteRule); return; } if (description === undefined) { description = `from ${peer.uniqueId}:${connection}`; } const rule = { ...peer.toEgressRuleConfig(), ...connection.toRuleJson(), description, }; if (isAllTrafficRule(rule)) { // We cannot allow this; if someone adds the rule in this way, it will be // removed again if they add other rules. We also can't automatically switch // to "allOutbound=true" mode, because we might have already emitted // EgressRule objects (which count as rules added later) and there's no way // to recall those. Better to prevent this for now. throw new Error('Cannot add an "all traffic" egress rule in this way; set allowAllOutbound=true on the SecurityGroup instead.'); } this.addDirectEgressRule(rule); } /** * Add a direct ingress rule */ addDirectIngressRule(rule) { if (!this.hasIngressRule(rule)) { this.directIngressRules.push(rule); } } /** * Return whether the given ingress rule exists on the group */ hasIngressRule(rule) { return this.directIngressRules.findIndex(r => ingressRulesEqual(r, rule)) > -1; } /** * Add a direct egress rule */ addDirectEgressRule(rule) { if (!this.hasEgressRule(rule)) { this.directEgressRules.push(rule); } } /** * Return whether the given egress rule exists on the group */ hasEgressRule(rule) { return this.directEgressRules.findIndex(r => egressRulesEqual(r, rule)) > -1; } /** * Add the default egress rule to the securityGroup * * This depends on allowAllOutbound: * * - If allowAllOutbound is true, we *TECHNICALLY* don't need to do anything, because * EC2 is going to create this default rule anyway. But, for maximum readability * of the template, we will add one anyway. * - If allowAllOutbound is false, we add a bogus rule that matches no traffic in * order to get rid of the default "all outbound" rule that EC2 creates by default. * If other rules happen to get added later, we remove the bogus rule again so * that it doesn't clutter up the template too much (even though that's not * strictly necessary). */ addDefaultEgressRule() { if (this.disableInlineRules) { const peer = this.allowAllOutbound ? ALL_TRAFFIC_PEER : NO_TRAFFIC_PEER; const port = this.allowAllOutbound ? ALL_TRAFFIC_PORT : NO_TRAFFIC_PORT; const description = this.allowAllOutbound ? ALLOW_ALL_RULE.description : MATCH_NO_TRAFFIC.description; super.addEgressRule(peer, port, description, false); } else { const rule = this.allowAllOutbound ? ALLOW_ALL_RULE : MATCH_NO_TRAFFIC; this.directEgressRules.push(rule); } } /** * Remove the bogus rule if it exists */ removeNoTrafficRule() { if (this.disableInlineRules) { const [scope, id] = this.determineRuleScope(NO_TRAFFIC_PEER, NO_TRAFFIC_PORT, 'to', false); scope.node.tryRemoveChild(id); } else { const i = this.directEgressRules.findIndex(r => egressRulesEqual(r, MATCH_NO_TRAFFIC)); if (i > -1) { this.directEgressRules.splice(i, 1); } } } } exports.SecurityGroup = SecurityGroup; _a = JSII_RTTI_SYMBOL_1; SecurityGroup[_a] = { fqn: "@aws-cdk/aws-ec2.SecurityGroup", version: "1.204.0" }; /** * Egress rule that purposely matches no traffic * * This is used in order to disable the "all traffic" default of Security Groups. * * No machine can ever actually have the 255.255.255.255 IP address, but * in order to lock it down even more we'll restrict to a nonexistent * ICMP traffic type. */ const MATCH_NO_TRAFFIC = { cidrIp: '255.255.255.255/32', description: 'Disallow all traffic', ipProtocol: 'icmp', fromPort: 252, toPort: 86, }; const NO_TRAFFIC_PEER = peer_1.Peer.ipv4(MATCH_NO_TRAFFIC.cidrIp); const NO_TRAFFIC_PORT = port_1.Port.icmpTypeAndCode(MATCH_NO_TRAFFIC.fromPort, MATCH_NO_TRAFFIC.toPort); /** * Egress rule that matches all traffic */ const ALLOW_ALL_RULE = { cidrIp: '0.0.0.0/0', description: 'Allow all outbound traffic by default', ipProtocol: '-1', }; const ALL_TRAFFIC_PEER = peer_1.Peer.anyIpv4(); const ALL_TRAFFIC_PORT = port_1.Port.allTraffic(); /** * Compare two ingress rules for equality the same way CloudFormation would (discarding description) */ function ingressRulesEqual(a, b) { return a.cidrIp === b.cidrIp && a.cidrIpv6 === b.cidrIpv6 && a.fromPort === b.fromPort && a.toPort === b.toPort && a.ipProtocol === b.ipProtocol && a.sourceSecurityGroupId === b.sourceSecurityGroupId && a.sourceSecurityGroupName === b.sourceSecurityGroupName && a.sourceSecurityGroupOwnerId === b.sourceSecurityGroupOwnerId; } /** * Compare two egress rules for equality the same way CloudFormation would (discarding description) */ function egressRulesEqual(a, b) { return a.cidrIp === b.cidrIp && a.cidrIpv6 === b.cidrIpv6 && a.fromPort === b.fromPort && a.toPort === b.toPort && a.ipProtocol === b.ipProtocol && a.destinationPrefixListId === b.destinationPrefixListId && a.destinationSecurityGroupId === b.destinationSecurityGroupId; } /** * Whether this rule refers to all traffic */ function isAllTrafficRule(rule) { return rule.cidrIp === '0.0.0.0/0' && rule.ipProtocol === '-1'; } //# 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* as cxschema from '@aws-cdk/cloud-assembly-schema';\nimport { Annotations, ContextProvider, IResource, Lazy, Names, Resource, ResourceProps, Stack, Token } from '@aws-cdk/core';\nimport * as cxapi from '@aws-cdk/cx-api';\nimport { Construct } from 'constructs';\nimport { Connections } from './connections';\nimport { CfnSecurityGroup, CfnSecurityGroupEgress, CfnSecurityGroupIngress } from './ec2.generated';\nimport { IPeer, Peer } from './peer';\nimport { Port } from './port';\nimport { IVpc } from './vpc';\n\nconst SECURITY_GROUP_SYMBOL = Symbol.for('@aws-cdk/iam.SecurityGroup');\n\nconst SECURITY_GROUP_DISABLE_INLINE_RULES_CONTEXT_KEY = '@aws-cdk/aws-ec2.securityGroupDisableInlineRules';\n\n/**\n * Interface for security group-like objects\n */\nexport interface ISecurityGroup extends IResource, IPeer {\n  /**\n   * ID for the current security group\n   * @attribute\n   */\n  readonly securityGroupId: string;\n\n  /**\n   * Whether the SecurityGroup has been configured to allow all outbound traffic\n   */\n  readonly allowAllOutbound: boolean;\n\n  /**\n   * Add an ingress rule for the current security group\n   *\n   * `remoteRule` controls where the Rule object is created if the peer is also a\n   * securityGroup and they are in different stack. If false (default) the\n   * rule object is created under the current SecurityGroup object. If true and the\n   * peer is also a SecurityGroup, the rule object is created under the remote\n   * SecurityGroup object.\n   */\n  addIngressRule(peer: IPeer, connection: Port, description?: string, remoteRule?: boolean): void;\n\n  /**\n   * Add an egress rule for the current security group\n   *\n   * `remoteRule` controls where the Rule object is created if the peer is also a\n   * securityGroup and they are in different stack. If false (default) the\n   * rule object is created under the current SecurityGroup object. If true and the\n   * peer is also a SecurityGroup, the rule object is created under the remote\n   * SecurityGroup object.\n   */\n  addEgressRule(peer: IPeer, connection: Port, description?: string, remoteRule?: boolean): void;\n}\n\n/**\n * A SecurityGroup that is not created in this template\n */\nabstract class SecurityGroupBase extends Resource implements ISecurityGroup {\n  /**\n   * Return whether the indicated object is a security group\n   */\n  public static isSecurityGroup(x: any): x is SecurityGroupBase {\n    return SECURITY_GROUP_SYMBOL in x;\n  }\n\n  public abstract readonly securityGroupId: string;\n  public abstract readonly allowAllOutbound: boolean;\n\n  public readonly canInlineRule = false;\n  public readonly connections: Connections = new Connections({ securityGroups: [this] });\n  public readonly defaultPort?: Port;\n\n  private peerAsTokenCount: number = 0;\n\n  constructor(scope: Construct, id: string, props?: ResourceProps) {\n    super(scope, id, props);\n\n    Object.defineProperty(this, SECURITY_GROUP_SYMBOL, { value: true });\n  }\n\n  public get uniqueId() {\n    return Names.nodeUniqueId(this.node);\n  }\n\n  public addIngressRule(peer: IPeer, connection: Port, description?: string, remoteRule?: boolean) {\n    if (description === undefined) {\n      description = `from ${peer.uniqueId}:${connection}`;\n    }\n\n    const [scope, id] = this.determineRuleScope(peer, connection, 'from', remoteRule);\n\n    // Skip duplicates\n    if (scope.node.tryFindChild(id) === undefined) {\n      new CfnSecurityGroupIngress(scope, id, {\n        groupId: this.securityGroupId,\n        ...peer.toIngressRuleConfig(),\n        ...connection.toRuleJson(),\n        description,\n      });\n    }\n  }\n\n  public addEgressRule(peer: IPeer, connection: Port, description?: string, remoteRule?: boolean) {\n    if (description === undefined) {\n      description = `to ${peer.uniqueId}:${connection}`;\n    }\n\n    const [scope, id] = this.determineRuleScope(peer, connection, 'to', remoteRule);\n\n    // Skip duplicates\n    if (scope.node.tryFindChild(id) === undefined) {\n      new CfnSecurityGroupEgress(scope, id, {\n        groupId: this.securityGroupId,\n        ...peer.toEgressRuleConfig(),\n        ...connection.toRuleJson(),\n        description,\n      });\n    }\n  }\n\n  public toIngressRuleConfig(): any {\n    return { sourceSecurityGroupId: this.securityGroupId };\n  }\n\n  public toEgressRuleConfig(): any {\n    return { destinationSecurityGroupId: this.securityGroupId };\n  }\n\n  /**\n   * Determine where to parent a new ingress/egress rule\n   *\n   * A SecurityGroup rule is parented under the group it's related to, UNLESS\n   * we're in a cross-stack scenario with another Security Group. In that case,\n   * we respect the 'remoteRule' flag and will parent under the other security\n   * group.\n   *\n   * This is necessary to avoid cyclic dependencies between stacks, since both\n   * ingress and egress rules will reference both security groups, and a naive\n   * parenting will lead to the following situation:\n   *\n   *   ╔════════════════════╗         ╔════════════════════╗\n   *   ║  ┌───────────┐     ║         ║    ┌───────────┐   ║\n   *   ║  │  GroupA   │◀────╬─┐   ┌───╬───▶│  GroupB   │   ║\n   *   ║  └───────────┘     ║ │   │   ║    └───────────┘   ║\n   *   ║        ▲           ║ │   │   ║          ▲         ║\n   *   ║        │           ║ │   │   ║          │         ║\n   *   ║        │           ║ │   │   ║          │         ║\n   *   ║  ┌───────────┐     ║ └───┼───╬────┌───────────┐   ║\n   *   ║  │  EgressA  │─────╬─────┘   ║    │ IngressB  │   ║\n   *   ║  └───────────┘     ║         ║    └───────────┘   ║\n   *   ║                    ║         ║                    ║\n   *   ╚════════════════════╝         ╚════════════════════╝\n   *\n   * By having the ability to switch the parent, we avoid the cyclic reference by\n   * keeping all rules in a single stack.\n   *\n   * If this happens, we also have to change the construct ID, because\n   * otherwise we might have two objects with the same ID if we have\n   * multiple reversed security group relationships.\n   *\n   *   ╔═══════════════════════════════════╗\n   *   ║┌───────────┐                      ║\n   *   ║│  GroupB   │                      ║\n   *   ║└───────────┘                      ║\n   *   ║      ▲                            ║\n   *   ║      │              ┌───────────┐ ║\n   *   ║      ├────\"from A\"──│ IngressB  │ ║\n   *   ║      │              └───────────┘ ║\n   *   ║      │              ┌───────────┐ ║\n   *   ║      ├─────\"to B\"───│  EgressA  │ ║\n   *   ║      │              └───────────┘ ║\n   *   ║      │              ┌───────────┐ ║\n   *   ║      └─────\"to B\"───│  EgressC  │ ║  <-- oops\n   *   ║                     └───────────┘ ║\n   *   ╚═══════════════════════════════════╝\n   */\n\n  protected determineRuleScope(\n    peer: IPeer,\n    connection: Port,\n    fromTo: 'from' | 'to',\n    remoteRule?: boolean): [SecurityGroupBase, string] {\n\n    if (remoteRule && SecurityGroupBase.isSecurityGroup(peer) && differentStacks(this, peer)) {\n      // Reversed\n      const reversedFromTo = fromTo === 'from' ? 'to' : 'from';\n      return [peer, `${this.uniqueId}:${connection} ${reversedFromTo}`];\n    } else {\n      // Regular (do old ID escaping to in order to not disturb existing deployments)\n      return [this, `${fromTo} ${this.renderPeer(peer)}:${connection}`.replace('/', '_')];\n    }\n  }\n\n  private renderPeer(peer: IPeer) {\n    if (Token.isUnresolved(peer.uniqueId)) {\n      // Need to return a unique value each time a peer\n      // is an unresolved token, else the duplicate skipper\n      // in `sg.addXxxRule` can detect unique rules as duplicates\n      return this.peerAsTokenCount++ ? `'{IndirectPeer${this.peerAsTokenCount}}'` : '{IndirectPeer}';\n    } else {\n      return peer.uniqueId;\n    }\n  }\n}\n\nfunction differentStacks(group1: SecurityGroupBase, group2: SecurityGroupBase) {\n  return Stack.of(group1) !== Stack.of(group2);\n}\n\nexport interface SecurityGroupProps {\n  /**\n   * The name of the security group. For valid values, see the GroupName\n   * parameter of the CreateSecurityGroup action in the Amazon EC2 API\n   * Reference.\n   *\n   * It is not recommended to use an explicit group name.\n   *\n   * @default If you don't specify a GroupName, AWS CloudFormation generates a\n   * unique physical ID and uses that ID for the group name.\n   */\n  readonly securityGroupName?: string;\n\n  /**\n   * A description of the security group.\n   *\n   * @default The default name will be the construct's CDK path.\n   */\n  readonly description?: string;\n\n  /**\n   * The VPC in which to create the security group.\n   */\n  readonly vpc: IVpc;\n\n  /**\n   * Whether to allow all outbound traffic by default.\n   *\n   * If this is set to true, there will only be a single egress rule which allows all\n   * outbound traffic. If this is set to false, no outbound traffic will be allowed by\n   * default and all egress traffic must be explicitly authorized.\n