feat: syslog-server under IaC (INFRA-12)

CDK stack for the EC2 syslog collector (rsyslog 514 -> CloudWatch agent -> unifi-syslog), mirroring the file-share/forgejo pattern. Recreated from the captured console config; EIP 184.72.154.32 imported + re-associated so the UniFi forwarding target is unchanged. Deployed + verified 2026-06-09. Note: deploy role can assume cdk-hnb659fds-* (account-admin via CDK bootstrap) — same exposure as every org CDK deploy role; per-app qualifier is a known org-wide follow-up.
2026-09-30 03:03:14 +00:00 · 2026-06-09 13:51:17 -04:00 · 2026-06-09 13:51:17 -04:00 · a8276b44fd
commit a8276b44fd
12 changed files with 961 additions and 0 deletions
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@ -0,0 +1,10 @@
+name: CI
+on:
+  pull_request:
+    branches: [main]
+
+jobs:
+  ci:
+    uses: Sea-Haven-Industries/.github/.github/workflows/ci-typescript-cdk.yaml@main
+    with:
+      node-version: "24"
--- a/.github/workflows/dependency-review.yml
+++ b/.github/workflows/dependency-review.yml
@ -0,0 +1,6 @@
+name: Dependency Review
+on:
+  pull_request:
+jobs:
+  review:
+    uses: Sea-Haven-Industries/.github/.github/workflows/callable-dependency-review.yaml@main
--- a/.github/workflows/deploy.yaml
+++ b/.github/workflows/deploy.yaml
@ -0,0 +1,20 @@
+name: Deploy
+on:
+  push:
+    branches: [main]
+
+permissions:
+  id-token: write
+  contents: read
+
+concurrency:
+  group: deploy
+  cancel-in-progress: false
+
+jobs:
+  deploy:
+    uses: Sea-Haven-Industries/.github/.github/workflows/cd-cdk.yaml@main
+    with:
+      node-version: "24"
+    secrets:
+      deploy-role-arn: ${{ secrets.AWS_DEPLOY_ROLE_ARN }}
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,6 @@
+node_modules/
+cdk.out/
+*.js
+*.d.ts
+*.js.map
+.env
--- a/README.md
+++ b/README.md
@ -0,0 +1,57 @@
+# syslog-server
+
+CDK stack for the **syslog-server** EC2 collector: receives remote syslog
+(UDP/TCP 514) from the office UniFi fleet over its Elastic IP and ships it to
+the `unifi-syslog` CloudWatch Logs group via the CloudWatch agent.
+
+Brought under IaC for **INFRA-12** (AWS audit L-6). Previously a console/CLI
+instance with no drift detection.
+
+## Architecture
+
+```
+office UniFi devices ──syslog/514──▶ EIP 184.72.154.32 ──▶ EC2 (rsyslog)
+                                                              │
+                                              /var/log/remote/<host>/*.log
+                                                              │
+                                              CloudWatch agent ──▶ unifi-syslog (90d)
+                                                                        │
+                                                       Syslog-NoIncomingLogs alarm ──▶ site-alerts
+```
+
+| Resource | Value |
+|---|---|
+| Instance | `syslog-server`, t4g.nano, Amazon Linux 2023 (arm64), 30 GiB encrypted gp3 |
+| Subnet | `subnet-0eea820effe1b3ae5` (public, us-east-1a, `vpc-0d3d4b67bd0cf8a68`) |
+| Elastic IP | `184.72.154.32` (`eipalloc-006bdefc9802f3285`) — **unmanaged**, re-associated by ID |
+| Security group | `syslog-server` — 514 tcp/udp + 22 from office IPs + VPC/VPN CIDRs; 2055/2056 udp reserved (netflow/sflow) |
+| IAM role | `syslog-server-role` — `AmazonSSMManagedInstanceCore` + `CloudWatchAgentServerPolicy` |
+| Log group | `unifi-syslog` (90-day retention) — created/retained by the CW agent, **not** a CFN resource (holds history; see stack comment) |
+| Alarm | `Syslog-NoIncomingLogs` — `IncomingLogEvents` Sum < 1 over 2×1-day, ALARM-only → `site-alerts` |
+
+## Access
+
+SSM Session Manager (no key pair). SSH 22 is open from office/VPC for
+break-glass only.
+
+## Deploy
+
+CI/CD via the org reusable workflows (`ci-typescript-cdk.yaml`,
+`cd-cdk.yaml`); merges to `main` deploy through the `githubdeploy-syslog-server`
+OIDC role. No Docker assets, so a local `cdk deploy` is also safe.
+
+```
+npm ci
+npm run diff
+npm run deploy
+```
+
+## Notes
+
+- **EIP is unmanaged.** CloudFormation associates it but never releases it, so
+  the public forwarding target survives any instance replacement.
+- **AMI is pinned in `cdk.context.json`** (`cachedInContext`). An AL2023 AMI
+  change forces instance replacement — refresh deliberately with
+  `cdk context --reset <ami key> && cdk synth`.
+- To widen device coverage of the forwarded syslog feed, see **INFRA-11**
+  (UniFi controller remote-logging config).
--- a/bin/app.ts
+++ b/bin/app.ts
@ -0,0 +1,11 @@
+#!/usr/bin/env node
+import "source-map-support/register";
+import * as cdk from "aws-cdk-lib";
+import { SyslogServerStack } from "../lib/syslog-server-stack";
+
+const app = new cdk.App();
+
+new SyslogServerStack(app, "syslog-server", {
+  stackName: "syslog-server",
+  env: { account: "328440206208", region: "us-east-1" },
+});
--- a/cdk.context.json
+++ b/cdk.context.json
@ -0,0 +1,48 @@
+{
+  "vpc-provider:account=328440206208:filter.vpc-id=vpc-0d3d4b67bd0cf8a68:region=us-east-1:returnAsymmetricSubnets=true": {
+    "vpcId": "vpc-0d3d4b67bd0cf8a68",
+    "vpcCidrBlock": "10.20.0.0/16",
+    "ownerAccountId": "328440206208",
+    "availabilityZones": [],
+    "vpnGatewayId": "vgw-073737d44762dffc2",
+    "subnetGroups": [
+      {
+        "name": "Private",
+        "type": "Private",
+        "subnets": [
+          {
+            "subnetId": "subnet-04e38c507e96f1926",
+            "cidr": "10.20.30.0/24",
+            "availabilityZone": "us-east-1a",
+            "routeTableId": "rtb-06a2f56f492b9b4de"
+          },
+          {
+            "subnetId": "subnet-0a0b4fc6f296dfba5",
+            "cidr": "10.20.40.0/24",
+            "availabilityZone": "us-east-1b",
+            "routeTableId": "rtb-01e152fe5cabca7d6"
+          }
+        ]
+      },
+      {
+        "name": "Public",
+        "type": "Public",
+        "subnets": [
+          {
+            "subnetId": "subnet-0eea820effe1b3ae5",
+            "cidr": "10.20.10.0/24",
+            "availabilityZone": "us-east-1a",
+            "routeTableId": "rtb-0f2232493a5c43fe8"
+          },
+          {
+            "subnetId": "subnet-0012f5895182c1580",
+            "cidr": "10.20.20.0/24",
+            "availabilityZone": "us-east-1b",
+            "routeTableId": "rtb-0f2232493a5c43fe8"
+          }
+        ]
+      }
+    ]
+  },
+  "ssm:account=328440206208:parameterName=/aws/service/ami-amazon-linux-latest/al2023-ami-kernel-6.1-arm64:region=us-east-1": "ami-02c114835b4e7739f"
+}
--- a/cdk.json
+++ b/cdk.json
@ -0,0 +1,21 @@
+{
+  "app": "npx ts-node bin/app.ts",
+  "watch": {
+    "include": ["**"],
+    "exclude": [
+      "README.md",
+      "cdk*.json",
+      "**/*.d.ts",
+      "**/*.js",
+      "tsconfig.json",
+      "package*.json",
+      "node_modules",
+      "cdk.out"
+    ]
+  },
+  "context": {
+    "@aws-cdk/aws-lambda:recognizeLayerVersion": true,
+    "@aws-cdk/core:checkSecretUsage": true,
+    "@aws-cdk/core:target-partitions": ["aws"]
+  }
+}
--- a/lib/syslog-server-stack.ts
+++ b/lib/syslog-server-stack.ts
@ -0,0 +1,202 @@
+import * as cdk from "aws-cdk-lib";
+import * as ec2 from "aws-cdk-lib/aws-ec2";
+import * as iam from "aws-cdk-lib/aws-iam";
+import * as cloudwatch from "aws-cdk-lib/aws-cloudwatch";
+import * as cwactions from "aws-cdk-lib/aws-cloudwatch-actions";
+import * as sns from "aws-cdk-lib/aws-sns";
+import { Construct } from "constructs";
+
+/**
+ * syslog-server — EC2 collector that receives remote syslog (UDP/TCP 514) from
+ * the office UniFi fleet over the EIP and ships it to the `unifi-syslog`
+ * CloudWatch Logs group via the CloudWatch agent.
+ *
+ * Brought under IaC for INFRA-12 (AWS audit L-6). Recreated to mirror the
+ * file-share/forgejo CDK pattern; the existing EIP (184.72.154.32) is imported
+ * by allocation ID and re-associated so the forwarding target is unchanged.
+ *
+ * The `unifi-syslog` log group is intentionally NOT a CloudFormation resource:
+ * it holds 90 days of history and is created/retained by the CloudWatch agent
+ * per the user-data config below (log_group_name + retention_in_days). Managing
+ * it as a CFN resource would either collide with the live group on create or
+ * risk deleting the history on a future replacement. The agent owns it; this
+ * stack owns the instance that runs the agent.
+ */
+export class SyslogServerStack extends cdk.Stack {
+  constructor(scope: Construct, id: string, props?: cdk.StackProps) {
+    super(scope, id, props);
+
+    const vpc = ec2.Vpc.fromLookup(this, "SeaHavenVpc", {
+      vpcId: "vpc-0d3d4b67bd0cf8a68",
+    });
+
+    // Public subnet (IGW route present) — the instance must be internet-facing
+    // so the office gateways can forward syslog to the EIP.
+    const publicSubnet = ec2.Subnet.fromSubnetAttributes(this, "PublicSubnet", {
+      subnetId: "subnet-0eea820effe1b3ae5",
+      availabilityZone: "us-east-1a",
+    });
+
+    // Office public IPs that forward syslog (see reference_office_ips).
+    const OFFICE_1 = "47.21.61.4/32";
+    const OFFICE_2 = "96.250.164.146/32";
+
+    const sg = new ec2.SecurityGroup(this, "SecurityGroup", {
+      vpc,
+      securityGroupName: "syslog-server",
+      description: "Syslog collector - rsyslog 514 from office + VPC",
+      allowAllOutbound: true,
+    });
+
+    // Remote syslog (UDP + TCP 514) from the office public IPs and the internal
+    // VPC / VPN CIDRs.
+    for (const proto of [ec2.Port.tcp(514), ec2.Port.udp(514)]) {
+      sg.addIngressRule(ec2.Peer.ipv4(OFFICE_1), proto, "syslog from office-1");
+      sg.addIngressRule(ec2.Peer.ipv4(OFFICE_2), proto, "syslog from office-2");
+      sg.addIngressRule(ec2.Peer.ipv4("10.10.0.0/16"), proto, "syslog from office VPN");
+      sg.addIngressRule(ec2.Peer.ipv4("10.20.0.0/16"), proto, "syslog from VPC");
+      sg.addIngressRule(ec2.Peer.ipv4("10.30.0.0/16"), proto, "syslog from VPN pool");
+    }
+
+    // SSH (SSM is the primary access path; 22 kept for break-glass from office/VPC).
+    sg.addIngressRule(ec2.Peer.ipv4(OFFICE_1), ec2.Port.tcp(22), "SSH from office-1");
+    sg.addIngressRule(ec2.Peer.ipv4(OFFICE_2), ec2.Port.tcp(22), "SSH from office-2");
+    sg.addIngressRule(ec2.Peer.ipv4("10.10.0.0/16"), ec2.Port.tcp(22), "SSH from office VPN");
+    sg.addIngressRule(ec2.Peer.ipv4("10.20.0.0/16"), ec2.Port.tcp(22), "SSH from VPC");
+
+    // NetFlow / sFlow ingress reserved from the office IPs. No collector is
+    // configured in user-data yet; kept to preserve the prior capability.
+    for (const port of [ec2.Port.udp(2055), ec2.Port.udp(2056)]) {
+      sg.addIngressRule(ec2.Peer.ipv4(OFFICE_1), port, "netflow/sflow from office-1");
+      sg.addIngressRule(ec2.Peer.ipv4(OFFICE_2), port, "netflow/sflow from office-2");
+    }
+
+    const role = new iam.Role(this, "InstanceRole", {
+      roleName: "syslog-server-role",
+      assumedBy: new iam.ServicePrincipal("ec2.amazonaws.com"),
+      managedPolicies: [
+        iam.ManagedPolicy.fromAwsManagedPolicyName("AmazonSSMManagedInstanceCore"),
+        iam.ManagedPolicy.fromAwsManagedPolicyName("CloudWatchAgentServerPolicy"),
+      ],
+    });
+
+    const userData = ec2.UserData.forLinux();
+    userData.addCommands(
+      "set -euxo pipefail",
+      "",
+      "# ── rsyslog: listen on UDP/TCP 514 ──",
+      "dnf install -y rsyslog",
+      "cat > /etc/rsyslog.d/10-listen.conf <<'EOF'",
+      'module(load="imudp")',
+      'input(type="imudp" port="514")',
+      'module(load="imtcp")',
+      'input(type="imtcp" port="514")',
+      "EOF",
+      "",
+      "# ── Write remote syslog to /var/log/remote/<host>/<program>.log ──",
+      "cat > /etc/rsyslog.d/20-remote.conf <<'EOF'",
+      'template(name="RemoteHost" type="string" string="/var/log/remote/%HOSTNAME%/%PROGRAMNAME%.log")',
+      "if $fromhost-ip != '127.0.0.1' then {",
+      '    action(type="omfile" dynaFile="RemoteHost" createDirs="on")',
+      "    stop",
+      "}",
+      "EOF",
+      "",
+      "mkdir -p /var/log/remote",
+      "systemctl enable rsyslog",
+      "systemctl restart rsyslog",
+      "",
+      "# ── CloudWatch agent: ship /var/log/remote/**/*.log to unifi-syslog ──",
+      "dnf install -y amazon-cloudwatch-agent",
+      "cat > /opt/aws/amazon-cloudwatch-agent/etc/amazon-cloudwatch-agent.json <<'EOF'",
+      "{",
+      '  "logs": {',
+      '    "logs_collected": {',
+      '      "files": {',
+      '        "collect_list": [',
+      "          {",
+      '            "file_path": "/var/log/remote/**/*.log",',
+      '            "log_group_name": "unifi-syslog",',
+      '            "log_stream_name": "{hostname}/{file_name}",',
+      '            "retention_in_days": 90',
+      "          }",
+      "        ]",
+      "      }",
+      "    }",
+      "  }",
+      "}",
+      "EOF",
+      "",
+      "/opt/aws/amazon-cloudwatch-agent/bin/amazon-cloudwatch-agent-ctl \\",
+      "  -a fetch-config -m ec2 \\",
+      "  -c file:/opt/aws/amazon-cloudwatch-agent/etc/amazon-cloudwatch-agent.json -s",
+      "systemctl enable amazon-cloudwatch-agent",
+    );
+
+    const instance = new ec2.Instance(this, "Instance", {
+      instanceName: "syslog-server",
+      vpc,
+      vpcSubnets: { subnets: [publicSubnet] },
+      instanceType: ec2.InstanceType.of(ec2.InstanceClass.T4G, ec2.InstanceSize.NANO),
+      machineImage: ec2.MachineImage.latestAmazonLinux2023({
+        cpuType: ec2.AmazonLinuxCpuType.ARM_64,
+        // Cache the resolved AMI in cdk.context.json so deploys don't implicitly
+        // pick up new AL2023 releases (AMI change forces instance replacement).
+        // Refresh deliberately: cdk context --reset <ami key> && cdk synth
+        cachedInContext: true,
+      }),
+      securityGroup: sg,
+      role,
+      userData,
+      blockDevices: [
+        {
+          deviceName: "/dev/xvda",
+          volume: ec2.BlockDeviceVolume.ebs(30, {
+            volumeType: ec2.EbsDeviceVolumeType.GP3,
+            encrypted: true,
+          }),
+        },
+      ],
+    });
+
+    // Re-associate the existing Elastic IP (184.72.154.32) so the UniFi fleet's
+    // forwarding target is unchanged. The allocation is UNMANAGED (referenced by
+    // ID) — CloudFormation can associate it but never release it.
+    new ec2.CfnEIPAssociation(this, "EipAssociation", {
+      allocationId: "eipalloc-006bdefc9802f3285",
+      instanceId: instance.instanceId,
+    });
+
+    // ALARM-only "no incoming logs" alarm to the shared site-alerts topic
+    // (alias/seahaven-alarm-topics CMK). Mirrors the prior standalone alarm:
+    // IncomingLogEvents (Sum) < 1 over two 1-day periods. 2-day window tolerates
+    // quiet weekends; treatMissingData=breaching catches a dead pipeline.
+    const alarmTopic = sns.Topic.fromTopicArn(
+      this, "SiteAlerts", "arn:aws:sns:us-east-1:328440206208:site-alerts",
+    );
+
+    const noLogsAlarm = new cloudwatch.Alarm(this, "NoIncomingLogsAlarm", {
+      alarmName: "Syslog-NoIncomingLogs",
+      alarmDescription:
+        "No log events delivered to unifi-syslog for 2 days — syslog pipeline may be down.",
+      metric: new cloudwatch.Metric({
+        namespace: "AWS/Logs",
+        metricName: "IncomingLogEvents",
+        dimensionsMap: { LogGroupName: "unifi-syslog" },
+        statistic: "Sum",
+        period: cdk.Duration.days(1),
+      }),
+      threshold: 1,
+      comparisonOperator: cloudwatch.ComparisonOperator.LESS_THAN_THRESHOLD,
+      evaluationPeriods: 2,
+      treatMissingData: cloudwatch.TreatMissingData.BREACHING,
+    });
+    noLogsAlarm.addAlarmAction(new cwactions.SnsAction(alarmTopic));
+
+    new cdk.CfnOutput(this, "InstanceId", { value: instance.instanceId });
+    new cdk.CfnOutput(this, "PublicIp", {
+      value: "184.72.154.32",
+      description: "Elastic IP — UniFi remote-syslog forwarding target",
+    });
+  }
+}
--- a/package-lock.json
+++ b/package-lock.json
@ -0,0 +1,532 @@
+{
+  "name": "syslog-server",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "syslog-server",
+      "version": "1.0.0",
+      "dependencies": {
+        "aws-cdk-lib": "2.257.0",
+        "constructs": "^10.0.0"
+      },
+      "bin": {
+        "app": "bin/app.js"
+      },
+      "devDependencies": {
+        "@types/node": "^22.0.0",
+        "aws-cdk": "^2.252.0",
+        "source-map-support": "^0.5.21",
+        "typescript": "~5.7.0"
+      }
+    },
+    "node_modules/@aws-cdk/asset-awscli-v1": {
+      "version": "2.2.273",
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+      "license": "Apache-2.0"
+    },
+    "node_modules/@aws-cdk/asset-node-proxy-agent-v6": {
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+    "node_modules/@aws-cdk/cloud-assembly-schema": {
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+      "bundleDependencies": [
+        "jsonschema",
+        "semver"
+      ],
+      "license": "Apache-2.0",
+      "dependencies": {
+        "jsonschema": "^1.5.0",
+        "semver": "^7.8.0"
+      },
+      "engines": {
+        "node": ">= 18.0.0"
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+    "node_modules/@aws-cdk/cloud-assembly-schema/node_modules/jsonschema": {
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+      "inBundle": true,
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+      "engines": {
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+      "license": "ISC",
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+      "license": "MIT",
+      "dependencies": {
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+      "license": "Apache-2.0",
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+        "@aws-cdk/cloud-assembly-api",
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+        "fs-extra",
+        "ignore",
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+        "minimatch",
+        "punycode",
+        "semver",
+        "table",
+        "yaml",
+        "mime-types"
+      ],
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@aws-cdk/asset-awscli-v1": "2.2.273",
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+    "node_modules/undici-types": {
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+}
--- a/package.json
+++ b/package.json
@ -0,0 +1,24 @@
+{
+  "name": "syslog-server",
+  "version": "1.0.0",
+  "bin": {
+    "app": "bin/app.js"
+  },
+  "scripts": {
+    "build": "tsc",
+    "cdk": "cdk",
+    "synth": "cdk synth",
+    "deploy": "cdk deploy",
+    "diff": "cdk diff"
+  },
+  "devDependencies": {
+    "@types/node": "^22.0.0",
+    "aws-cdk": "^2.252.0",
+    "source-map-support": "^0.5.21",
+    "typescript": "~5.7.0"
+  },
+  "dependencies": {
+    "aws-cdk-lib": "2.257.0",
+    "constructs": "^10.0.0"
+  }
+}
--- a/tsconfig.json
+++ b/tsconfig.json
@ -0,0 +1,24 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "commonjs",
+    "lib": ["ES2022"],
+    "types": ["node"],
+    "declaration": true,
+    "strict": true,
+    "noImplicitAny": true,
+    "strictNullChecks": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true,
+    "inlineSourceMap": true,
+    "inlineSources": true,
+    "strictPropertyInitialization": false,
+    "outDir": "./cdk.out",
+    "rootDir": ".",
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true,
+    "esModuleInterop": true
+  },
+  "exclude": ["node_modules", "cdk.out"]
+}