Add OIDC discovery endpoints to CSP connect-src

[maxbrc]

The CSP's connect-src directive was previously built with just AUTH_AUTHORITY. Then my fix #680 added the origin of that authority. Currently the setup assumes that all OIDC endpoints live on that origin. Providers can serve these endpoints on different origins though, so the browser blocks the token exchange #690.

This adds docker/get_oidc_csp_origins.sh, which reads the .well-known/openid-configuration discovery document and adds their origins to connect-src.
It's best-effort, so if the discovery fails it exits with 0 and no output.

I also fixed two additional things. The first is curl appearing twice in the Dockerfile dependency installation, the second is my previous fix scoping AUTH_AUTHORITY_ORIGIN too loosely.

Fixes #690

Documentation

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Paste the PR link from https://github.com/netbirdio/docs here:

netbirdio/docs#965

Summary by CodeRabbit

• New Features
  • Added automatic discovery of OpenID Connect origins for Content Security Policy settings.
  • CSP connect-src configuration now includes validated origins discovered from the authentication authority.
  • Added configurable discovery timeouts and an option to disable discovery.
  • Added graceful fallback behavior when discovery is unavailable, invalid, or misconfigured.

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• docker/init_react_envs.sh

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📝 Walkthrough

Walkthrough

The Docker image now includes jq and an executable OIDC discovery script. React environment initialization derives endpoint origins from OpenID configuration and appends them to the CSP connect-src policy.

Changes

OIDC CSP integration

Layer / File(s)	Summary
OIDC endpoint discovery docker/get_oidc_csp_origins.sh	The script fetches OpenID configuration data, extracts valid endpoint origins, removes duplicates, and handles disabled discovery, errors, invalid JSON, timeouts, and missing endpoints.
Image packaging and CSP wiring docker/Dockerfile, docker/init_react_envs.sh	The image installs jq, copies the discovery script, and makes it executable. React environment initialization adds the authentication authority and discovered OIDC origins to CSP_DOMAINS_CONNECT_SRC.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: 🟡 Moderate · up to c1aec

This change expands CSP connect-src from OIDC discovery metadata so cross-origin token flows can work. Allowing HTTP endpoint origins may expose authorization traffic when an insecure provider endpoint is configured, so this should be addressed or explicitly accepted before merge.

Suggested reviewers: mlsmaycon

Poem

A rabbit maps each OIDC trail
jq parses the returned detail
Origins join the CSP stream
Token requests pass the gate
The dashboard hops through login light

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The changes satisfy the linked objectives [#680] [#690]. They preserve the authority origin, derive additional OIDC endpoint origins from the discovery document, and support endpoints hosted on differ…
Out of Scope Changes check	✅ Passed	The Dockerfile, discovery script, and CSP initialization changes directly support the linked OIDC CSP objectives. No unrelated code changes are identified.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…
Title check	✅ Passed	The title clearly and concisely describes the main change: adding OIDC discovery endpoints to the CSP connect-src directive.
Description check	✅ Passed	The description explains the problem, implementation, best-effort behavior, related fixes, issue reference, documentation selection, and documentation PR link. The optional E2E test overrides are not …

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

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Inline comments:
In `@docker/get_oidc_csp_origins.sh`:
- Line 41: Update the origin filter in the get_oidc_csp_origins pipeline to
accept only https:// origins, while explicitly allowing http:// loopback hosts
for local development; reject all other cleartext HTTP origins.

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• docker/Dockerfile
• docker/get_oidc_csp_origins.sh
• docker/init_react_envs.sh

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