campaign_connector/docs/security/security-handoff.md

Security Handoff Report

Date: 2026-01-01 Project: SMS Campaign Manager Status: All critical, high, and medium priority issues resolved

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Completed Security Fixes

Issue	Severity	Status
Docker privileged mode	Critical	Fixed
Docker host networking	Critical	Fixed
Hardcoded API secret	Critical	Fixed
Command injection (IP detection)	Critical	Fixed
API keys in query parameters	High	Fixed
No security headers	High	Fixed
SameSite cookie too permissive	Medium	Fixed
Login redirect error	Medium	Fixed
No CSRF protection	Medium	Fixed
Error messages expose internal details	Medium	Fixed
No input validation on phone numbers	Medium	Fixed
CSV injection not prevented	Medium	Fixed

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Security Headers Now Active

All responses now include:

X-Content-Type-Options: nosniff
X-Frame-Options: DENY
X-XSS-Protection: 1; mode=block
Referrer-Policy: strict-origin-when-cross-origin
Permissions-Policy: geolocation=(), microphone=(), camera=()

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CSRF Protection

Flask-WTF CSRF protection is now enabled:

• All state-changing requests require CSRF token
• Token available via meta tag in templates: <meta name="csrf-token">
• JavaScript helper secureFetch() in common.js automatically includes token
• Login endpoint exempt (no session before login)
• API key authenticated endpoints exempt (separate auth mechanism)

Files modified:

• src/app.py - Added CSRFProtect initialization
• src/requirements.txt - Added Flask-WTF==1.2.1
• src/templates/base.html - Added CSRF meta tag
• src/static/js/common.js - Added getCSRFToken() and secureFetch() helpers

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Error Message Sanitization

Created standardized error handler module:

• src/core/error_handler.py - Centralized error handling
• Logs full error details server-side
• Returns generic safe messages to clients
• Prevents internal path/stack trace disclosure

Files updated:

• src/routes/lists.py - 6 locations
• src/routes/conversations.py - 8 locations
• src/routes/api/upload_routes.py - 4 locations

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Phone Number Validation

Created phone validation module:

• src/core/phone_validation.py - Validation and normalization
• Validates minimum/maximum length (7-15 digits per E.164)
• Normalizes to consistent format
• Filters invalid numbers during CSV upload

Features:

• validate_phone_number() - Returns (is_valid, normalized, error)
• normalize_phone_number() - Strips formatting, keeps digits
• format_phone_display() - Formats for UI display

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CSV Injection Prevention

Added sanitization for uploaded CSV files:

• Prefixes dangerous characters with single quote
• Prevents formula execution: =, +, -, @, \t, \r, \n
• Applied to all CSV upload endpoints

Functions added to upload_routes.py:

• sanitize_csv_value() - Sanitizes individual values
• sanitize_csv_row() - Sanitizes entire row dict

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Low Priority / Best Practices (Pending)

Issue	Recommendation
Database timeout (30s)	Reduce to 5-10 seconds
Rate limiting	Add per-user limiting for authenticated endpoints
Dependency scanning	Add safety check to CI/CD
Audit logging	Log failed logins, API usage, admin actions

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Risk Summary

Severity	Count	Status
Critical	4	All Fixed
High	2	All Fixed
Medium	8	All Fixed
Low	4	Pending

Overall Risk Level: Very Low (all critical/high/medium resolved)

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Files Modified During Security Review

Phase 1 - Critical/High Fixes:

File	Change
docker-compose.yml	Removed privileged mode and host networking
android/termux-sms-api-server.py	Removed default secret, added validation, fixed command injection
src/routes/auth_routes.py	Fixed dashboard redirect to campaigns
src/core/auth.py	Removed API key query parameter support
src/app.py	Added security headers, changed SameSite to Strict

Phase 2 - Medium Priority Fixes:

File	Change
src/app.py	Added CSRF protection with Flask-WTF
src/requirements.txt	Added Flask-WTF dependency
src/templates/base.html	Added CSRF meta tag
src/static/js/common.js	Added CSRF token helpers
src/routes/lists.py	Sanitized error messages
src/routes/conversations.py	Sanitized error messages
src/routes/api/upload_routes.py	Error sanitization, CSV injection prevention, phone validation

New Files Created:

File	Purpose
android/setup-api-key.sh	Android API key setup script
scripts/update-api-keys.sh	Ubuntu API key update script
src/core/error_handler.py	Standardized error handling module
src/core/phone_validation.py	Phone number validation utilities
SECURITY_FIXES.md	Documentation of critical fixes
test-setup-flow.sh	Automated validation script

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Current Security Configuration

API Authentication:

• Android (Termux): SMS_API_SECRET in ~/.bashrc
• Ubuntu (.env): TERMUX_API_KEY, SMS_API_SECRET
• Headers only (query parameters disabled)

Docker Security:

• Privileged: false
• NetworkMode: bridge (isolated)

Session Security:

• Cookie: HttpOnly, Secure (when HTTPS), SameSite=Strict
• Remember Cookie: SameSite=Strict
• CSRF: Enabled via Flask-WTF
• Timeout: 24 hours

Response Headers:

• X-Frame-Options: DENY
• X-Content-Type-Options: nosniff
• X-XSS-Protection: 1; mode=block
• Referrer-Policy: strict-origin-when-cross-origin
• Permissions-Policy: restricted

Input Validation:

• Phone numbers: Validated and normalized on upload
• CSV files: Sanitized to prevent formula injection
• Error messages: Generic responses, full details logged server-side

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Verification Commands

# Verify Docker security
docker inspect sms-campaign-manager | grep -E "Privileged|NetworkMode"

# Verify security headers
curl -I http://localhost:5000/health | grep -E "X-Frame|X-Content|X-XSS"

# Verify CSRF token endpoint
curl http://localhost:5000/api/csrf-token

# Verify API authentication
curl -H "X-API-Key: $(grep TERMUX_API_KEY .env | cut -d= -f2)" \
  http://100.107.173.66:5001/health

# Run dependency security check
pip install safety && safety check

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Report generated: 2026-01-01 Last updated: 2026-01-01 (medium priority fixes implemented) Status: Ready for production