--- name: appfolio-security-basics description: 'Secure AppFolio API credentials and tenant data. Trigger: "appfolio security". ' allowed-tools: Read, Write, Edit, Bash(npm:*), Bash(curl:*), Grep version: 1.0.0 license: MIT author: Jeremy Longshore tags: - saas - property-management - appfolio - real-estate compatibility: Designed for Claude Code --- # AppFolio Security Basics ## Overview AppFolio manages property portfolios containing tenant PII (SSNs, bank accounts, lease terms), owner financial data, and maintenance vendor records. A breach exposes rent rolls, payment histories, and personally identifiable tenant information across every managed property. Secure every integration point: API credentials, webhook endpoints, and any pipeline that touches tenant or owner financial records. ## API Key Management ```typescript import https from "https"; import axios, { AxiosInstance } from "axios"; function createAppFolioClient(): AxiosInstance { const clientId = process.env.APPFOLIO_CLIENT_ID; const clientSecret = process.env.APPFOLIO_CLIENT_SECRET; const baseUrl = process.env.APPFOLIO_BASE_URL; if (!clientId || !clientSecret || !baseUrl) { throw new Error("Missing APPFOLIO_CLIENT_ID, APPFOLIO_CLIENT_SECRET, or APPFOLIO_BASE_URL"); } return axios.create({ baseURL: baseUrl, auth: { username: clientId, password: clientSecret }, httpsAgent: new https.Agent({ minVersion: "TLSv1.2", rejectUnauthorized: true }), }); } ``` ## Webhook Signature Verification ```typescript import crypto from "crypto"; function verifyAppFolioWebhook(req: Request, res: Response, next: NextFunction): void { const signature = req.headers["x-appfolio-signature"] as string; const secret = process.env.APPFOLIO_WEBHOOK_SECRET!; const expected = crypto.createHmac("sha256", secret).update(req.body).digest("hex"); if (!signature || !crypto.timingSafeEqual(Buffer.from(signature), Buffer.from(expected))) { res.status(401).send("Invalid signature"); return; } next(); } ``` ## Input Validation ```typescript import { z } from "zod"; const TenantSchema = z.object({ tenant_id: z.string().uuid(), first_name: z.string().min(1).max(100), last_name: z.string().min(1).max(100), email: z.string().email(), unit_id: z.string().uuid(), lease_start: z.string().regex(/^\d{4}-\d{2}-\d{2}$/), rent_amount: z.number().positive().max(100000), }); function validateTenantPayload(data: unknown) { return TenantSchema.parse(data); } ``` ## Data Protection ```typescript const APPFOLIO_PII_FIELDS = ["ssn", "bank_account", "routing_number", "date_of_birth", "drivers_license"]; function redactAppFolioLog(record: Record): Record { const redacted = { ...record }; for (const field of APPFOLIO_PII_FIELDS) { if (field in redacted) redacted[field] = "[REDACTED]"; } return redacted; } ``` ## Security Checklist - [ ] API credentials stored in secrets manager, not `.env` in production - [ ] HTTPS enforced with TLS 1.2+ for all API calls - [ ] Tenant SSN and bank account numbers never logged - [ ] Webhook signatures verified on every inbound request - [ ] API credentials rotated quarterly - [ ] Access scoped to minimum required property endpoints - [ ] Rent payment data encrypted at rest - [ ] Audit trail enabled for tenant record access ## Error Handling | Vulnerability | Risk | Mitigation | |---|---|---| | Leaked API credentials | Full property portfolio exposure | Secrets manager + rotation | | Unvalidated webhook payloads | Spoofed tenant updates | HMAC signature verification | | Tenant PII in logs | Compliance violation (state privacy laws) | Field-level redaction | | Overly broad API scope | Lateral access to unrelated properties | Per-property credential scoping | | Unencrypted payment data | Financial data breach | TLS 1.2+ in transit, AES at rest | ## Resources - [AppFolio Stack APIs](https://www.appfolio.com/stack/partners/api) - [OWASP API Security Top 10](https://owasp.org/www-project-api-security/) ## Next Steps See `appfolio-prod-checklist`. --- Source attribution: jeremylongshore Original project: https://github.com/jeremylongshore/claude-code-plugins-plus-skills/blob/main/plugins/saas-packs/appfolio-pack/skills/appfolio-security-basics/SKILL.md License: MIT License information: https://opensource.org/license/mit Original upstream instructions; downloaded from Mega AI Hub. ## Upstream license notice MIT License Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. # Mega AI Hub resource metadata Creator / publisher: jeremylongshore Original project: https://github.com/jeremylongshore/claude-code-plugins-plus-skills/blob/main/plugins/saas-packs/appfolio-pack/skills/appfolio-security-basics/SKILL.md Attribution basis: Source repository record Fields of work: Data & Analytics, Development & Engineering, Legal, Real Estate Roles: Compliance Officer, Data Analyst, Property Manager, Real Estate Agent, Security Engineer Specialties: API, Design, Word Documents, Frontend, Mobile, Stripe Tools: Appfolio Country applicability: Country not specified Classification basis: Source catalog labels Instruction SHA-256: 27f33eeab0fb2353a25abeec91e8b40bb48372fe14408bcf1493396097145f91