rustguac/docs/configuration.md

Configuration Reference

rustguac reads a TOML configuration file. All settings have sensible defaults and are optional.

rustguac --config /opt/rustguac/config.toml serve

See config.example.toml for a fully commented reference.

Server settings

Key	Default	Description
listen_addr	127.0.0.1:8089	Address and port to listen on
guacd_addr	127.0.0.1:4822	guacd TCP address
recording_path	./recordings	Session recording directory
static_path	./static	Static web files directory
db_path	./rustguac.db	SQLite database path
site_title	rustguac	Browser tab and page header title

Session timeouts

Key	Default	Description
session_pending_timeout_secs	60	Seconds before pending sessions expire
session_max_duration_secs	28800 (8h)	Maximum active session duration
auth_session_ttl_secs	86400 (24h)	OIDC auth session cookie TTL

Browser session settings

Key	Default	Description
xvnc_path	Xvnc	Path to Xvnc binary
chromium_path	chromium	Path to Chromium binary
display_range_start	100	First X display number
display_range_end	199	Last X display number
cdp_port_range_start	9200	First Chrome DevTools Protocol port (for login scripts)
cdp_port_range_end	9299	Last CDP port
login_scripts_dir	/opt/rustguac/scripts	Directory containing login scripts
login_script_timeout_secs	120	Maximum runtime for login scripts before they are killed

Connection allowlists

CIDR ranges controlling which hosts sessions can connect to. All default to localhost only.

Important: These are top-level TOML keys and must appear before any [section] header. Keys placed after a section header (e.g., [tls]) are scoped to that section and will be silently ignored.

Key	Default	Description
ssh_allowed_networks	["127.0.0.0/8", "::1/128"]	Allowed SSH targets
rdp_allowed_networks	["127.0.0.0/8", "::1/128"]	Allowed RDP targets
vnc_allowed_networks	["127.0.0.0/8", "::1/128"]	Allowed VNC targets
web_allowed_networks	["127.0.0.0/8", "::1/128"]	Allowed web session URL hosts

Trusted proxies

Key	Default	Description
trusted_proxies	[]	CIDRs of reverse proxies whose X-Forwarded-For to trust

[tls] section

Enables HTTPS and optionally TLS to guacd. Omit the entire section for plain HTTP.

Key	Required	Description
cert_path	Yes	HTTPS certificate path (PEM)
key_path	Yes	HTTPS private key path (PEM)
guacd_cert_path	No	Trust certificate for guacd TLS connection

[oidc] section

Enables OpenID Connect authentication. When configured, the web UI shows a login button. API key auth continues to work alongside OIDC.

Key	Default	Description
issuer_url	—	OIDC provider issuer URL (required)
client_id	—	OIDC client ID (required)
client_secret	—	OIDC client secret (or use OIDC_CLIENT_SECRET env var)
redirect_uri	—	Redirect URI: https://your-host/auth/callback (required)
default_role	operator	Role assigned to new users on first login
groups_claim	groups	JWT claim name containing group memberships
extra_scopes	[]	Additional OIDC scopes to request

[vault] section

Enables the Vault-backed address book. Requires VAULT_SECRET_ID environment variable.

Key	Default	Description
addr	—	Vault server address (required)
role_id	—	AppRole role ID (required)
mount	secret	KV v2 mount path
base_path	rustguac	Base path under the mount
namespace	—	Vault Enterprise / OpenBao namespace
instance_name	—	Instance name for instance-scoped entries

[drive] section

Enables file transfer for RDP (drive redirection) and SSH (SFTP).

Key	Default	Description
enabled	false	Enable drive/file transfer
drive_path	./drives	Base directory for per-session storage
drive_name	Shared Drive	Name shown in remote RDP session
allow_download	true	Allow file download from remote
allow_upload	true	Allow file upload to remote
cleanup_on_close	true	Delete session drive directory on disconnect
retention_secs	0	Delay before cleanup (0 = immediate)
luks_device	—	LUKS container file path
luks_name	rustguac-drives	Device-mapper name
luks_key_path	—	Vault KV path for LUKS encryption key

Environment variables

Variable	Description
OIDC_CLIENT_SECRET	Override OIDC client secret from config file
VAULT_SECRET_ID	Vault AppRole secret ID
RUST_LOG	Log level (e.g., info, debug, rustguac=debug)

Setting environment variables for systemd

The shipped systemd unit (rustguac.service) does not include an EnvironmentFile directive by default. To provide secrets like VAULT_SECRET_ID and OIDC_CLIENT_SECRET, create a systemd drop-in override:

1. Create the env file with your secrets:

cat > /opt/rustguac/env <<'EOF'
VAULT_SECRET_ID=your-vault-secret-id
OIDC_CLIENT_SECRET=your-oidc-client-secret
EOF
chmod 600 /opt/rustguac/env
chown rustguac:rustguac /opt/rustguac/env

2. Create a systemd override to load the env file:

sudo systemctl edit rustguac

This opens an editor. Add the following:

[Service]
EnvironmentFile=/opt/rustguac/env

Save and close. This creates a drop-in file at /etc/systemd/system/rustguac.service.d/override.conf.

3. Reload and restart:

sudo systemctl daemon-reload
sudo systemctl restart rustguac

The override persists across package upgrades — dpkg will not overwrite files in the .d/ directory.

Verifying the environment

To confirm the env file is loaded:

sudo systemctl show rustguac | grep EnvironmentFile

You should see:

EnvironmentFile=/opt/rustguac/env