feat(deploy): production deployment setup and fixes
- Debian-based api image (bookworm-slim), docker/debian mirrors, prisma binaryTargets for openssl 3.0 - nginx: admin SPA under /admin, TLS via acme.sh (ZeroSSL) + auto-renewal cron, http->https redirect - prisma: add origin_goods.delisted migration, sync missing schema (good_image/tag_font_color/good_tags), fix users.createdAt Timestamptz - api: CORS wildcard reflection, helmet CORP cross-origin, price backfill in persistProductDetail, categoryIcon ancestor fallback, mediaByColor per-color gallery in public goods detail - admin: /admin base path (vite + router) - import-data.mjs: udt_name casting, serial sequence advance fix
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---
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title: Apply Principle of Least Privilege
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impact: MEDIUM
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impactDescription: Reduced attack surface, better audit trail
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tags: privileges, security, roles, permissions
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---
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## Apply Principle of Least Privilege
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Grant only the minimum permissions required. Never use superuser for application queries.
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**Incorrect (overly broad permissions):**
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```sql
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-- Application uses superuser connection
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-- Or grants ALL to application role
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grant all privileges on all tables in schema public to app_user;
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grant all privileges on all sequences in schema public to app_user;
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-- Any SQL injection becomes catastrophic
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-- drop table users; cascades to everything
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```
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**Correct (minimal, specific grants):**
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```sql
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-- Create role with no default privileges
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create role app_readonly nologin;
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-- Grant only SELECT on specific tables
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grant usage on schema public to app_readonly;
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grant select on public.products, public.categories to app_readonly;
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-- Create role for writes with limited scope
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create role app_writer nologin;
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grant usage on schema public to app_writer;
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grant select, insert, update on public.orders to app_writer;
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grant usage on sequence orders_id_seq to app_writer;
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-- No DELETE permission
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-- Login role inherits from these
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create role app_user login password 'xxx';
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grant app_writer to app_user;
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```
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Revoke public defaults:
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```sql
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-- Revoke default public access
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revoke all on schema public from public;
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revoke all on all tables in schema public from public;
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```
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Reference: [Roles and Privileges](https://supabase.com/blog/postgres-roles-and-privileges)
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