fix(auth): build CAS callbacks from a configured canonical origin - #310
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fix(auth): build CAS callbacks from a configured canonical origin#310rlorenzo wants to merge 2 commits into
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Codecov Report❌ Patch coverage is Additional details and impacted files@@ Coverage Diff @@
## main #310 +/- ##
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+ Coverage 42.38% 42.66% +0.27%
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Files 994 995 +1
Lines 49877 49920 +43
Branches 5887 5897 +10
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+ Hits 21142 21296 +154
+ Misses 27798 27684 -114
- Partials 937 940 +3
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Pull request overview
This PR hardens CAS login/validation/logout callback URL generation by introducing a configured canonical public origin (instead of deriving the origin from the incoming request), reducing exposure to Host-header poisoning and aligning outbound URLs across the app.
Changes:
- Added
IPublicUrlService+ startup validation forApplication:PublicBaseUrl(fail-fast outside Development). - Updated CAS login/logout and
HttpHelper.GetRootURL()callers to use the canonical origin; fixed/2PathBase handling and strengthened/apiReturnUrl guarding. - Tightened
AllowedHostsin Test/Production and added unit tests covering canonical-origin behavior and validation rules.
Reviewed changes
Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.
Show a summary per file
| File | Description |
|---|---|
| web/Program.cs | Registers/validates PublicUrlOptions, wires IPublicUrlService into HttpHelper. |
| web/Controllers/HomeController.cs | Uses canonical base URL for CAS service/logout URLs; adjusts ReturnUrl handling and /api guard. |
| web/Classes/PublicUrlService.cs | New canonical-origin service + options + validator enforcing safe/expected base URL shapes. |
| web/Classes/HttpHelper.cs | Delegates GetRootURL() to IPublicUrlService (or request-derived fallback in Development). |
| web/appsettings.Test.json | Sets restrictive AllowedHosts and Application:PublicBaseUrl for Test. |
| web/appsettings.Production.json | Sets restrictive AllowedHosts and Application:PublicBaseUrl for Production. |
| test/Classes/PublicUrlServiceTests.cs | Unit tests for normalization, request fallback, and startup validation rules. |
| test/Classes/HomeControllerCasUrlTests.cs | Unit tests ensuring CAS URLs are built from configured origin and /api ReturnUrl yields 401. |
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📝 WalkthroughWalkthroughAdded a validated canonical public URL service. Integrated it with ChangesPublic URL integration
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The PR centralizes public URL generation and fixes sitemap discovery, but the current head can still omit the required /2 path from generated links and can list actions protected by controller-level permissions. These bounded correctness issues should be fixed or explicitly accepted before merge. Sequence Diagram(s)sequenceDiagram
participant Request
participant HomeController
participant IPublicUrlService
participant CAS
Request->>HomeController: submit login or logout request
HomeController->>IPublicUrlService: build canonical redirect URL
IPublicUrlService-->>HomeController: return absolute URL with PathBase
HomeController->>CAS: issue encoded CAS redirect
CAS-->>Request: redirect to canonical application URL
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 27.27% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 77 functions across 19 files. (1 skipped: 1 unsupported.)
✨ Finishing Touches 💡 2📝 Generate docstrings 💡
🛠️ Fix failing CI checks 💡
🧪 Generate unit tests (beta)
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Pull request overview
Copilot reviewed 18 out of 18 changed files in this pull request and generated no new comments.
Suppressed comments (2)
web/Classes/HealthChecks/HealthCheckExtensions.cs:236
- HealthChecks UI endpoint URL reads Application:PublicBaseUrl directly but only trims a trailing '/'. This bypasses the whitespace + trailing-slash normalization you implemented in PublicUrlService/PublicUrlOptionsValidator (and can matter when the value comes from env vars/SSM with accidental whitespace), producing an invalid poll URL even though startup validation would accept the value.
var baseUrl = configuration["Application:PublicBaseUrl"]?.TrimEnd('/');
web/Classes/PublicUrlService.cs:156
- The scheme validation error message is correct for non-Development, but in Development it can trigger for non-http(s) schemes while still saying "outside Development", which is misleading during local setup/debugging. Consider making the message conditional so it accurately reflects the rules in each environment.
if (uri.Scheme != Uri.UriSchemeHttps && !(isDevelopment && uri.Scheme == Uri.UriSchemeHttp))
{
return ValidateOptionsResult.Fail($"{setting} must use https outside Development.");
}
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Actionable comments posted: 5
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Inline comments:
In `@web/Areas/ClinicalScheduler/Services/ScheduleEditService.cs`:
- Around line 746-752: The public URL contract omits the configured application
PathBase, causing generated links to fail under deployments such as /2. Extend
IPublicUrlService.BuildUrl and its implementation to accept and preserve the
application base path, then update ScheduleEditService.cs:746-752,
VerificationService.cs:700-703, and HealthCheckExtensions.cs:235-240 to use it
for the rotation, verification, and collector URLs respectively; add /2
regression coverage and preserve app-root URL handling.
In `@web/Classes/HttpHelper.cs`:
- Around line 24-32: Remove the optional publicUrl parameter from
HttpHelper.Configure and stop assigning publicUrlService there; update the
Configure call sites in EffortIntegrationTestBase and TestDataBuilder to supply
the required IPublicUrlService so GetRootURL() continues returning the
configured URL.
In `@web/Classes/PublicUrlService.cs`:
- Around line 161-168: Update PublicUrlService validation to reject
PublicBaseUrl values ending with bare “?” or “#”, in addition to non-empty
uri.Query and uri.Fragment; inspect the original URL or equivalent delimiter
presence so these cases cannot pass. Add both malformed-value cases to
Validate_RejectsMalformedOrUnsafeValues in PublicUrlServiceTests.cs.
Apply the same fix in `@test/Classes/PublicUrlServiceTests.cs` around lines 153 -
161.
In `@web/Controllers/HomeController.cs`:
- Around line 305-312: Update BuildRedirectUri in HomeController to prepend
Request.PathBase to targetPath before passing it to _publicUrl.BuildUrl,
preserving the deployed application base for CAS callback URLs. Also update the
logout service URL construction at web/Controllers/HomeController.cs:278 to
include Request.PathBase.
- Around line 116-130: Update IsApiPath to strip Request.PathBase only when
returnUrl equals the base path or starts with the base path followed by “/”;
otherwise leave it unchanged. Then recognize only the exact “/api” path or paths
beginning with “/api/”, preserving root-relative matching after a “/2”
deployment base.
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📒 Files selected for processing (17)
test/Classes/PublicUrlServiceTests.cstest/ClinicalScheduler/EmailNotificationTest.cstest/ClinicalScheduler/Integration/ControllerServiceIntegrationTest.cstest/ClinicalScheduler/ScheduleEditServiceRollbackTest.cstest/ClinicalScheduler/ScheduleEditServiceTest.cstest/ClinicalScheduler/TestableScheduleEditService.cstest/Effort/VerificationServiceTests.csweb/Areas/ClinicalScheduler/Services/ScheduleEditService.csweb/Areas/Effort/Services/VerificationService.csweb/Classes/HealthChecks/HealthCheckExtensions.csweb/Classes/HttpHelper.csweb/Classes/PublicUrlService.csweb/Controllers/HomeController.csweb/Program.csweb/Services/EmailService.csweb/appsettings.Production.jsonweb/appsettings.Test.json
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- web/Services/EmailService.cs
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Inline comments:
In `@web/Classes/SitemapMiddleware.cs`:
- Around line 59-65: Update the authorization condition in the sitemap filtering
logic to require both authAttribute and permAttribute to be absent when
anonAttribute or anonAttributeClass is present. Replace the OR-based absence
check with an AND-based check while preserving the existing excludeAttribute and
excludeAttributeClass requirements.
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CAS login, ticket validation and logout derived their service URL from HttpHelper.GetRootURL(), which reads the request Host, and AllowedHosts was "*" in every environment. A Host header that got past the proxies could therefore poison a CAS callback. - Application:PublicBaseUrl per environment, validated on start so a deployed environment fails fast rather than falling back to the request - AllowedHosts narrowed to the real TEST/PROD hostnames plus localhost - GetRootURL() returns the canonical origin when configured, so the sitemap and emulation links stop being request-derived too - Login's /api guard normalizes the "~/" app-relative form, strips the PathBase and matches whole path segments, so an API ReturnUrl gets a 401 instead of a CAS HTML redirect under the deployed /2 sub-app, while /apiary stays a normal page - Retire EmailSettings:BaseUrl, which held the same public origin under an email-specific name. Email links, the health-check collector and CAS now read one setting, so the two cannot drift NormalizeAppRelativeUrl, IsApiPath and StripPathBase are shared with the dynamic login screen stacked above, so they live here at the bottom.
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Inline comments:
In `@web/Classes/SitemapMiddleware.cs`:
- Around line 54-58: Update isPermissionGated in the sitemap filtering logic to
also detect PermissionAttribute on method.DeclaringType, while preserving
method-level detection. Add a regression test covering an anonymous action on a
permission-gated controller and verify it is excluded from the sitemap.
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… 404 PermissionAttribute derives from AuthorizeAttribute, so an action carrying both (HomeController.Policy, EmulateUser) matched AuthorizeAttribute twice and the singular GetCustomAttribute threw. The catch swallowed it and fell through, so /sitemap.xml answered 404 in every environment. - Ask for any matching attribute rather than exactly one; only presence was ever tested, so the filter behavior is unchanged - Drop the AuthorizeAttribute test, which that same inheritance made dead code: anything gated by [Permission] already fails the [Permission] test - Log the swallowed exception, which is why a total outage of the endpoint went unnoticed
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Finding
CAS login, ticket validation and logout all built their
serviceURL fromHttpHelper.GetRootURL(), which derives the origin from the requestHost.AllowedHostswas"*"in every environment. AHostheader that got past IIS/F5/Cloudflare could therefore poison a CAS callback URL. A restrictive CAS service registry limits the impact, but the application should not depend on that external control.Change
New
web/Classes/PublicUrlService.cssupplies the canonical origin fromApplication:PublicBaseUrl:PublicUrlOptionsValidatorruns viaValidateOnStart()and fails startup outside Development when the value is missing, relative, non-https, or carries user-info, a query string, or a fragment.BaseUrl/BuildUrl(path)take an application-relative path: the PathBase lives inside the configured origin, so nothing prependsRequest.PathBaseon top.Application:PublicBaseUrlAllowedHostshttps://secure-test.vetmed.ucdavis.edu/2secure-test.vetmed.ucdavis.edu;localhosthttps://viper.vetmed.ucdavis.edu/2viper.vetmed.ucdavis.edu;localhost*(unchanged)Callers:
HomeControllerbuilds the login,p3/serviceValidateand logoutservicevalues from the service.HttpHelper.GetRootURL()delegates to it, so the sitemap and Directory emulation link stop being request-derived, and it usesRequest.PathBaseinstead of sniffing for a literal/2/prefix.Login's/apiguard normalizes the~/app-relative form, strips the PathBase, and matches whole path segments. Previously the SPAs'/2/api/...never fired the guard on TEST/PROD (API callers got a CAS HTML redirect instead of a 401), while/apiarywrongly did.EmailSettings:BaseUrlis retired. It held this same origin under an email-specific name. Email links, the health-check collector and CAS now read one setting, so the two cannot drift.Forwarded headers already excluded
X-Forwarded-Host; no change needed there.Also in this PR
fix(sitemap):/sitemap.xmlhas been returning 404 in every environment, found while smoke-testing the above.PermissionAttributederives fromAuthorizeAttribute, so an action carrying both (HomeController.Policy,EmulateUser) matched twice and the singularGetCustomAttributethrewAmbiguousMatchException; thecatchswallowed it and fell through. Now uses plural lookups (only presence was ever tested, so filter behavior is unchanged) and logs the exception.Verified locally
Exercised against a dev server in both the request-derived and configured-origin modes:
curl -H "Host: attacker.example" /loginyields aserviceofhttps://viper.example.test/2/CasLogin?..., so the forged host appears nowhere. This is the security property the PR exists for.service, a full CAS round-trip, the sitemap, the emulation link, a real Effort verification email (link.../2/Effort/202510/my-effort, checked in Mailpit) and the health-check collector poll URL all use the configured origin, with exactly one/2.Deployment
Application:PublicBaseUrlis already set in the checked-inappsettings.Test.json/appsettings.Production.json, so no config change is needed. Just confirm no env var or SSM entry overrides it; startup fails with a clear message if it ends up missing.https://secure-test.vetmed.ucdavis.edu/2/CasLogin.AllowedHostsis now restrictive. If an F5 or IIS health probe arrives with a Host other than the canonical hostname orlocalhost(an IP or machine name), it will be rejected. This is the one item I could not verify from the repo; if it appears in the TEST logs, add that host to the list.EmailSettings:BaseUrl.