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Bug Report
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Resolution: Unresolved
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L3 - Default
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When an invalid CSRF token is submitted, the CSRF Filter invalidates the current session and an error should be sent back. The actual exception is swallowed by the Authentication Filter though.
Steps to reproduce:
- start a Camunda distribution using Tomcat
- do a POST request without providing any CSRF token (or with an invalid CSRF token), like
POST http://localhost:8080/camunda/api/admin/setup/default/user/create { "profile": { "id": "foo", "firstName": "foo", "lastName": "foo", "email": "" }, "credentials": { "password": "foo" } }
Observed Behavior:
A response code 500 is returned along with a stacktrace
<!doctype html><html lang="en"><head><title>HTTP Status 500 – Internal Server Error</title><style type="text/css">h1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} h2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} h3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} body {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} b {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} p {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;} a {color:black;} a.name {color:black;} .line {height:1px;background-color:#525D76;border:none;}</style></head><body><h1>HTTP Status 500 – Internal Server Error</h1><hr class="line" /><p><b>Type</b> Exception Report</p><p><b>Message</b> Cannot create a session after the response has been committed</p><p><b>Description</b> The server encountered an unexpected condition that prevented it from fulfilling the request.</p><p><b>Exception</b></p><pre>java.lang.IllegalStateException: Cannot create a session after the response has been committed org.apache.catalina.connector.Request.doGetSession(Request.java:2974) org.apache.catalina.connector.Request.getSession(Request.java:2416) org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:908) org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:920) org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter.doFilter(AuthenticationFilter.java:67) </pre><p><b>Note</b> The full stack trace of the root cause is available in the server logs.</p><hr class="line" /><h3>Apache Tomcat/9.0.12</h3></body></html>
Expected Behavior:
- The actual error (i.e. "Token provided via HTTP Header is absent/empty." or "Invalid HTTP Header Token.") is returned.
- The status code is 403
Hint:
- The function call req.getSession() throws an IllegalStateException because it would try to create a new session as the actual session already has been invalided. However, creating a new session fails because the response is already committed.
This ticket was migrated to github: https://github.com/camunda/camunda-bpm-platform/issues/2299. Please use this link for any future references and continue any discussion there.