Trusted proxies

When AliasVault sits behind another reverse proxy (HAProxy, Traefik, Cloudflare, an upstream nginx, etc.), the built-in nginx reads the real client IP from the X-Forwarded-For header so that audit logs and the IP allowlist see the actual client rather than the upstream proxy.

To prevent header spoofing, nginx only honors X-Forwarded-For when the request comes from an explicitly trusted upstream. The TRUSTED_PROXIES environment variable controls that list.

How it works

For every incoming request, nginx checks the direct peer’s IP against TRUSTED_PROXIES:

• If the peer IP matches a trusted entry, nginx replaces $remote_addr with the value from X-Forwarded-For.
• If it doesn’t match, the header is ignored and the direct peer IP is used.

real_ip_recursive is enabled, so when a chain of trusted proxies is configured nginx walks the X-Forwarded-For list right-to-left until it finds the first untrusted address.

Options

Set TRUSTED_PROXIES in the environment: section of your docker-compose.yml to one of:

Value	Effect
empty (default)	Trust all RFC1918 ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16).
Comma-separated list of CIDRs/IPs	Trust only the listed proxies. Recommended when you know your upstream proxy address(es).
none	Trust no upstream proxies. X-Forwarded-For is always ignored and the direct peer IP is logged.

Examples

# ...
    environment:
      # Trust only a specific HAProxy at 10.0.1.5 and a /24 of internal proxies:
      TRUSTED_PROXIES: "10.0.1.5,192.168.10.0/24"
# ...

# ...
    environment:
      # Disable X-Forwarded-For handling entirely:
      TRUSTED_PROXIES: "none"
# ...

Apply the change

After updating docker-compose.yml, the container must be recreated for the new environment value to take effect:

docker compose down
docker compose up -d

Why narrow this down

The default of all RFC1918 ranges is convenient. Most setups place AliasVault and its upstream proxy in the same private network. But it does mean that any request originating from a private IP can spoof X-Forwarded-For and appear in the logs as a different client. If you have other workloads on the same private network, set TRUSTED_PROXIES to your specific upstream proxy address(es) so only that proxy is trusted to set the header.