fix(security): relax Referrer-Policy and document HSTS_INCLUDE_SUBDOMAINS (#862) (#863)

- Change Helmet default from no-referrer to strict-origin-when-cross-origin
  so browsers send the origin on cross-origin requests, allowing Google Maps
  API key restrictions by HTTP referrer to work correctly
- Document HSTS_INCLUDE_SUBDOMAINS in all deployment artifacts:
  .env.example, docker-compose.yml, README.md, unraid-template.xml,
  charts/values.yaml, charts/configmap.yaml, wiki/Environment-Variables.md
This commit is contained in:
Julien G.
2026-04-23 18:39:11 +02:00
committed by GitHub
parent d169334cfd
commit de2f5f1347
8 changed files with 11 additions and 0 deletions
+1
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@@ -400,6 +400,7 @@ Caddy handles TLS and WebSockets automatically.
| `DEFAULT_LANGUAGE` | Default language on the login page for users with no saved preference. Browser/OS language is auto-detected first; this is the fallback. Supported: `de`, `en`, `es`, `fr`, `hu`, `nl`, `br`, `cs`, `pl`, `ru`, `zh`, `zh-TW`, `it`, `ar` | `en` |
| `ALLOWED_ORIGINS` | Comma-separated origins for CORS and email links | same-origin |
| `FORCE_HTTPS` | Optional. When `true`: 301-redirects HTTP to HTTPS, sends HSTS, adds CSP `upgrade-insecure-requests`, forces the session cookie `secure` flag. Useful behind a TLS-terminating reverse proxy. Requires `TRUST_PROXY`. | `false` |
| `HSTS_INCLUDE_SUBDOMAINS` | When `true`: adds the `includeSubDomains` directive to the HSTS header, extending HTTPS enforcement to all subdomains. Only effective when HSTS is active (`FORCE_HTTPS=true` or `NODE_ENV=production`). Leave `false` if you run other services on sibling subdomains over plain HTTP. | `false` |
| `COOKIE_SECURE` | Controls the `secure` flag on the `trek_session` cookie. Auto-derived: on when `NODE_ENV=production` or `FORCE_HTTPS=true`. Escape hatch: set `false` to allow session cookies over plain HTTP. Not recommended in production. | auto |
| `TRUST_PROXY` | Number of trusted reverse proxies. Tells Express to read client IP from `X-Forwarded-For` and protocol from `X-Forwarded-Proto`. Defaults to `1` in production; off in dev unless set. | `1` |
| `ALLOW_INTERNAL_NETWORK` | Allow outbound requests to private/RFC-1918 IPs (e.g. Immich on your LAN). Loopback and link-local addresses remain blocked. | `false` |
+3
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@@ -22,6 +22,9 @@ data:
{{- if .Values.env.FORCE_HTTPS }}
FORCE_HTTPS: {{ .Values.env.FORCE_HTTPS | quote }}
{{- end }}
{{- if .Values.env.HSTS_INCLUDE_SUBDOMAINS }}
HSTS_INCLUDE_SUBDOMAINS: {{ .Values.env.HSTS_INCLUDE_SUBDOMAINS | quote }}
{{- end }}
{{- if .Values.env.COOKIE_SECURE }}
COOKIE_SECURE: {{ .Values.env.COOKIE_SECURE | quote }}
{{- end }}
+2
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@@ -30,6 +30,8 @@ env:
# Also used as the base URL for links in email notifications and other external links.
# FORCE_HTTPS: "false"
# Optional. When "true": HTTPS redirect, HSTS, CSP upgrade-insecure-requests, secure cookies. Only behind a TLS proxy. Requires TRUST_PROXY.
# HSTS_INCLUDE_SUBDOMAINS: "false"
# When "true": adds includeSubDomains to the HSTS header. Only effective when HSTS is active. Leave "false" if sibling subdomains still run over plain HTTP.
# COOKIE_SECURE: "true"
# Auto-derived (true in production or when FORCE_HTTPS=true). Set "false" to force cookies over plain HTTP. Not recommended for production.
# TRUST_PROXY: "1"
+1
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@@ -24,6 +24,7 @@ services:
# - DEFAULT_LANGUAGE=en # Default language on the login page for users with no saved preference. Browser/OS language is auto-detected first; this is the fallback. Supported: de, en, es, fr, hu, nl, br, cs, pl, ru, zh, zh-TW, it, ar
- ALLOWED_ORIGINS=${ALLOWED_ORIGINS:-} # Comma-separated origins for CORS and email notification links
# - FORCE_HTTPS=true # Optional. Enables HTTPS redirect, HSTS, CSP upgrade-insecure-requests, and secure cookies behind a TLS proxy
# - HSTS_INCLUDE_SUBDOMAINS=false # When true: adds includeSubDomains to the HSTS header. Only effective when HSTS is active. Leave false if sibling subdomains still run over plain HTTP.
# - COOKIE_SECURE=false # Escape hatch: force session cookies over plain HTTP even in production. Not recommended.
# - TRUST_PROXY=1 # Trusted proxy count for X-Forwarded-For / X-Forwarded-Proto. Required for FORCE_HTTPS to work.
# - ALLOW_INTERNAL_NETWORK=false # Set to true if Immich or other services are hosted on your local network (RFC-1918 IPs). Loopback and link-local addresses remain blocked regardless.
+1
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@@ -13,6 +13,7 @@ LOG_LEVEL=info # info = concise user actions; debug = verbose admin-level detail
ALLOWED_ORIGINS=https://trek.example.com # Comma-separated origins for CORS and email links
FORCE_HTTPS=false # Optional. When true: HTTPS redirect + HSTS + CSP upgrade-insecure-requests + secure cookies. Only behind a TLS proxy.
# HSTS_INCLUDE_SUBDOMAINS=false # When true: adds includeSubDomains to the HSTS header. Only effective when HSTS is active (FORCE_HTTPS=true or NODE_ENV=production). Leave false if you run other services on sibling subdomains over plain HTTP.
COOKIE_SECURE=true # Auto-derived (true when NODE_ENV=production or FORCE_HTTPS=true). Set false to force cookies over plain HTTP.
TRUST_PROXY=1 # Trusted proxy hops (parseInt or 1). Active in production by default; off in dev unless set. Needed for FORCE_HTTPS.
ALLOW_INTERNAL_NETWORK=false # Allow outbound requests to private/RFC1918 IPs (e.g. Immich hosted on your LAN). Loopback and link-local addresses are always blocked.
+1
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@@ -124,6 +124,7 @@ export function createApp(): express.Application {
},
crossOriginEmbedderPolicy: false,
hsts: hstsActive ? { maxAge: 31536000, includeSubDomains: hstsIncludeSubdomains } : false,
referrerPolicy: { policy: 'strict-origin-when-cross-origin' },
}));
if (shouldForceHttps) {
+1
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@@ -37,6 +37,7 @@
<Config Name="ALLOWED_ORIGINS" Target="ALLOWED_ORIGINS" Default="" Mode="" Description="Comma-separated origins allowed for CORS and used as base URL in email notification links (e.g. https://trek.example.com)." Type="Variable" Display="always" Required="false" Mask="false"/>
<Config Name="APP_URL" Target="APP_URL" Default="" Mode="" Description="Public base URL of this instance (e.g. https://trek.example.com). Required when OIDC is enabled — must match the redirect URI registered with your IdP. Also used as base URL for email notification links." Type="Variable" Display="always" Required="false" Mask="false"/>
<Config Name="FORCE_HTTPS" Target="FORCE_HTTPS" Default="false" Mode="" Description="Optional. When true: HTTPS redirect, HSTS header, CSP upgrade-insecure-requests, and secure cookies. Only useful behind a TLS-terminating proxy. Requires TRUST_PROXY." Type="Variable" Display="advanced" Required="false" Mask="false">false</Config>
<Config Name="HSTS_INCLUDE_SUBDOMAINS" Target="HSTS_INCLUDE_SUBDOMAINS" Default="false" Mode="" Description="When true: adds includeSubDomains to the HSTS header, extending HTTPS enforcement to all subdomains. Only effective when HSTS is active (FORCE_HTTPS=true or NODE_ENV=production). Leave false if you run other services on sibling subdomains over plain HTTP." Type="Variable" Display="advanced" Required="false" Mask="false">false</Config>
<Config Name="COOKIE_SECURE" Target="COOKIE_SECURE" Default="true" Mode="" Description="Auto-derived (true in production or when FORCE_HTTPS=true). Set to false to force session cookies over plain HTTP. Not recommended for production." Type="Variable" Display="advanced" Required="false" Mask="false">true</Config>
<Config Name="TRUST_PROXY" Target="TRUST_PROXY" Default="1" Mode="" Description="Trusted proxy hops for X-Forwarded-For/X-Forwarded-Proto. Defaults to 1 in production; off in development unless set. Required for FORCE_HTTPS." Type="Variable" Display="advanced" Required="false" Mask="false">1</Config>
<Config Name="ALLOW_INTERNAL_NETWORK" Target="ALLOW_INTERNAL_NETWORK" Default="false" Mode="" Description="Allow outbound requests to private/RFC-1918 IP addresses. Set to true if Immich or other integrated services are hosted on your local network." Type="Variable" Display="advanced" Required="false" Mask="false">false</Config>
+1
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@@ -53,6 +53,7 @@ These three variables work together behind a TLS-terminating reverse proxy. See
| Variable | Description | Default |
|---|---|---|
| `FORCE_HTTPS` | When `true`: 301-redirects HTTP→HTTPS, sends HSTS (`max-age=31536000`), adds CSP `upgrade-insecure-requests`, forces cookie `secure` flag. Only useful behind a TLS proxy. Requires `TRUST_PROXY`. | `false` |
| `HSTS_INCLUDE_SUBDOMAINS` | When `true`: adds the `includeSubDomains` directive to the HSTS header, extending HTTPS enforcement to all subdomains. Only effective when HSTS is active (`FORCE_HTTPS=true` or `NODE_ENV=production`). Leave `false` if you run other services on sibling subdomains over plain HTTP. | `false` |
| `TRUST_PROXY` | Number of trusted proxy hops. Tells Express to read the real client IP from `X-Forwarded-For` and protocol from `X-Forwarded-Proto`. Defaults to `1` automatically in production. Required for `FORCE_HTTPS` to detect the forwarded protocol. | `1` (production) |
| `COOKIE_SECURE` | Controls the `secure` flag on the `trek_session` cookie. Auto-derived as `true` when `NODE_ENV=production` or `FORCE_HTTPS=true`. Set to `false` only as an escape hatch for LAN testing without TLS — not recommended in production. | auto |