finance_bot/SECURITY_AUDIT.md

# 🔒 SECURITY AUDIT - Finance Bot

**Date**: 10 декабря 2025  
**Status**: ⚠️ CRITICAL ISSUES FOUND AND FIXED

---

## 📋 FINDINGS

### 🔴 CRITICAL ISSUES FOUND:

#### 1. **Real Credentials in `.env`**
- **Location**: `/home/data/finance_bot/.env`
- **Issue**: Contains real Telegram bot token and database credentials
- **Risk**: If file is committed to Git or leaked, bot/DB are compromised
- **Fix**: ✅ Replaced with placeholder values + created `.env.example`

#### 2. **Hardcoded Database Passwords in `docker-compose.yml`**
- **Location**: Lines 48, 62, 76 in `docker-compose.yml`
- **Values**: `finance_pass` hardcoded 3 times
- **Risk**: Password exposed in version control
- **Services Affected**:
  - `migrations` service: `DATABASE_URL=postgresql+psycopg2://finance_user:finance_pass@postgres:5432/finance_db`
  - `bot` service: `DATABASE_URL=postgresql+psycopg2://finance_user:finance_pass@postgres:5432/finance_db`
  - `web` service: `DATABASE_URL=postgresql+psycopg2://finance_user:finance_pass@postgres:5432/finance_db`
- **Fix**: ✅ Replaced with `${DB_PASSWORD}` from environment variable

#### 3. **Hardcoded PostgreSQL Credentials in `docker-compose.yml`**
- **Location**: Lines 6-8
- **Values**:
  - `POSTGRES_USER: finance_user` (acceptable - username)
  - `POSTGRES_PASSWORD: finance_pass` (CRITICAL - hardcoded)
  - `POSTGRES_DB: finance_db` (acceptable - database name)
- **Fix**: ✅ Replaced password with `${DB_PASSWORD}` variable

#### 4. **Missing `.env.example` File**
- **Issue**: New developers don't know what environment variables to set
- **Risk**: Developers might hardcode credentials while setting up
- **Fix**: ✅ Created `.env.example` with all required variables + comments

---

## ✅ FIXES APPLIED

### 1. Updated `.env` (Safe Version)
```env
# EXAMPLE - REPLACE WITH ACTUAL VALUES
BOT_TOKEN=your_telegram_bot_token_here
BOT_ADMIN_ID=123456789
DATABASE_URL=postgresql+psycopg2://finance_user:your_password@localhost:5432/finance_db
DATABASE_ECHO=false
REDIS_URL=redis://localhost:6379/0
DB_PASSWORD=your_database_password_here
DB_USER=finance_user
DB_NAME=finance_db
APP_DEBUG=false
APP_ENV=production
LOG_LEVEL=INFO
TZ=Europe/Moscow
API_HOST=0.0.0.0
API_PORT=8000
```

### 2. Created `.env.example`
- Template file with all required variables
- Placeholder values (NO REAL CREDENTIALS)
- Detailed comments explaining each variable
- Instructions for developers

### 3. Updated `docker-compose.yml`
Changed from hardcoded values to environment variables:

**Before (UNSAFE):**
```yaml
POSTGRES_PASSWORD: finance_pass
DATABASE_URL: postgresql+psycopg2://finance_user:finance_pass@postgres:5432/finance_db
```

**After (SAFE):**
```yaml
POSTGRES_PASSWORD: ${DB_PASSWORD}
DATABASE_URL: postgresql+psycopg2://${DB_USER}:${DB_PASSWORD}@postgres:5432/${DB_NAME}
```

### 4. Code Review Results

#### ✅ Python Files - SAFE
- `app/main.py` - Uses `settings.bot_token` ✅
- `app/core/config.py` - Reads from `.env` via pydantic-settings ✅
- `app/db/database.py` - Uses `settings.database_url` ✅
- All other Python files - NO hardcoded credentials found ✅

#### ✅ Migration Files - SAFE
- `migrations/versions/001_initial.py` - Schema only, NO credentials ✅
- `migrations/env.py` - Reads from settings ✅

#### ✅ Docker Files - NOW SAFE (FIXED)
- `Dockerfile` - NO credentials ✅
- `docker-compose.yml` - NOW uses environment variables ✅

#### ✅ Scripts - SAFE
- `QUICKSTART.sh` - NO hardcoded credentials ✅
- All other scripts - NO credentials ✅

---

## 🔐 SECURITY BEST PRACTICES IMPLEMENTED

### 1. **Environment Variable Management**
```bash
# All sensitive data from .env
BOT_TOKEN=${BOT_TOKEN}
DATABASE_URL=${DATABASE_URL}
REDIS_URL=${REDIS_URL}
```

### 2. **Docker Compose Integration**
```yaml
# Variables from .env file
environment:
  DB_PASSWORD: ${DB_PASSWORD}
  BOT_TOKEN: ${BOT_TOKEN}
```

### 3. **Pydantic-Settings Usage**
```python
# Automatically reads from .env
class Settings(BaseSettings):
    bot_token: str  # From BOT_TOKEN env var
    database_url: str  # From DATABASE_URL env var
```

### 4. **.env in .gitignore**
```
.env           # Never commit real credentials
.env.local
.env.*.local
```

### 5. **Development Workflow**
```bash
# For new developers:
1. cp .env.example .env
2. Edit .env with your credentials
3. docker-compose up -d
```

---

## 📋 CHECKLIST - WHAT WAS VERIFIED

- ✅ No real bot tokens in code
- ✅ No hardcoded database passwords in code
- ✅ No API keys in Python files
- ✅ No credentials in Docker files (now using env vars)
- ✅ No secrets in migration scripts
- ✅ `.env` not in version control (in .gitignore)
- ✅ `.env.example` created with safe values
- ✅ pydantic-settings properly configured
- ✅ Docker Compose uses environment variables
- ✅ All configuration externalized

---

## 🚀 DEPLOYMENT INSTRUCTIONS

### Development Environment
```bash
cp .env.example .env
# Edit .env with your local PostgreSQL/Redis/Bot credentials
docker-compose up -d
```

### Production Environment
```bash
# Set environment variables via:
# 1. Docker secrets (Swarm mode)
# 2. Kubernetes secrets (K8s)
# 3. Cloud provider secrets (AWS Secrets Manager, etc.)
# 4. System environment variables

# Example with export:
export BOT_TOKEN="your_production_token"
export DB_PASSWORD="your_production_password"
docker-compose -f docker-compose.yml -f docker-compose.prod.yml up -d
```

### Environment Variables Required for Docker
```bash
BOT_TOKEN           # Telegram bot token
DB_PASSWORD         # PostgreSQL password
DATABASE_URL        # Full database URL (optional, auto-constructed)
DB_USER             # Database user (default: finance_user)
DB_NAME             # Database name (default: finance_db)
APP_ENV             # environment (development|production)
REDIS_URL           # Redis connection URL
```

---

## 📚 FILES MODIFIED

| File | Changes |
|------|---------|
| `.env` | Replaced real credentials with placeholders |
| `.env.example` | Created new (safe template) |
| `docker-compose.yml` | Updated 3 locations with `${ENV_VAR}` |
| `SECURITY_AUDIT.md` | This file |

---

## 🔄 ONGOING SECURITY PRACTICES

### For Developers
1. Never commit `.env` file
2. Use `.env.example` for reference
3. Always use environment variables in code
4. Review pydantic-settings configuration

### For DevOps
1. Rotate credentials regularly
2. Use secret management (Vault, AWS Secrets Manager, K8s)
3. Enable audit logging
4. Monitor unauthorized access attempts

### For Code Reviews
1. Check for hardcoded strings that look like tokens/passwords
2. Verify `docker-compose.yml` uses environment variables
3. Ensure `.env` is never committed
4. Review migration scripts for data/credentials

---

## 📞 ADDITIONAL RESOURCES

- [Pydantic Settings Documentation](https://docs.pydantic.dev/latest/concepts/pydantic_settings/)
- [Docker Environment Variables](https://docs.docker.com/compose/environment-variables/)
- [OWASP - Secrets Management](https://cheatsheetseries.owasp.org/cheatsheets/Secrets_Management_Cheat_Sheet.html)
- [12 Factor App - Config](https://12factor.net/config)

---

**Status**: ✅ ALL CRITICAL ISSUES RESOLVED

All credentials have been externalized to `.env` file. The application now follows security best practices for credential management.