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[Bug 2059128] [NEW] Internal Server Error when attempring to use an incorrect URL within the metadata API

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Public bug reported:

When trying to GET a non-existent metadata key within the VM, like
'/latest/meta-data/hostname/abc', the Nova metadata service responses
with a 500 HTTP status code:

Inside a VM:

$ curl http://169.254.169.254/latest/meta-data/hostname/abc
<html>
 <head>
  <title>500 Internal Server Error</title>
 </head>
 <body>
  <h1>500 Internal Server Error</h1>
  An unknown error has occurred. Please try your request again.<br /><br />

 </body>
</html>$


The nova metadata service logs:

CRITICAL nova [None req-3286f047-98c4-41c8-a11b-02a140fd2e4d None None] Unhandled error: TypeError: string indices must be integers
ERROR nova Traceback (most recent call last):
ERROR nova   File "/usr/local/lib/python3.9/site-packages/paste/urlmap.py", line 216, in __call__
ERROR nova     return app(environ, start_response)
ERROR nova   File "/usr/local/lib/python3.9/site-packages/webob/dec.py", line 129, in __call__
ERROR nova     resp = self.call_func(req, *args, **kw)
ERROR nova   File "/usr/local/lib/python3.9/site-packages/webob/dec.py", line 193, in call_func
ERROR nova     return self.func(req, *args, **kwargs)
ERROR nova   File "/usr/local/lib/python3.9/site-packages/oslo_middleware/base.py", line 124, in __call__
ERROR nova     response = req.get_response(self.application)
ERROR nova   File "/usr/local/lib/python3.9/site-packages/webob/request.py", line 1313, in send
ERROR nova     status, headers, app_iter = self.call_application(
ERROR nova   File "/usr/local/lib/python3.9/site-packages/webob/request.py", line 1278, in call_application
ERROR nova     app_iter = application(self.environ, start_response)
ERROR nova   File "/usr/local/lib/python3.9/site-packages/webob/dec.py", line 129, in __call__
ERROR nova     resp = self.call_func(req, *args, **kw)
ERROR nova   File "/usr/local/lib/python3.9/site-packages/webob/dec.py", line 193, in call_func
ERROR nova     return self.func(req, *args, **kwargs)
ERROR nova   File "/usr/local/lib/python3.9/site-packages/oslo_middleware/base.py", line 124, in __call__
ERROR nova     response = req.get_response(self.application)
ERROR nova   File "/usr/local/lib/python3.9/site-packages/webob/request.py", line 1313, in send
ERROR nova     status, headers, app_iter = self.call_application(
ERROR nova   File "/usr/local/lib/python3.9/site-packages/webob/request.py", line 1278, in call_application
ERROR nova     app_iter = application(self.environ, start_response)
ERROR nova   File "/usr/local/lib/python3.9/site-packages/webob/dec.py", line 129, in __call__
ERROR nova     resp = self.call_func(req, *args, **kw)
ERROR nova   File "/usr/local/lib/python3.9/site-packages/webob/dec.py", line 193, in call_func
ERROR nova     return self.func(req, *args, **kwargs)
ERROR nova   File "/opt/stack/nova/nova/api/metadata/handler.py", line 129, in __call__
ERROR nova     data = meta_data.lookup(req.path_info)
ERROR nova   File "/opt/stack/nova/nova/api/metadata/base.py", line 576, in lookup
ERROR nova     data = self.get_ec2_item(path_tokens[1:])
ERROR nova   File "/opt/stack/nova/nova/api/metadata/base.py", line 308, in get_ec2_item
ERROR nova     return find_path_in_tree(data, path_tokens[1:])
ERROR nova   File "/opt/stack/nova/nova/api/metadata/base.py", line 737, in find_path_in_tree
ERROR nova     data = data[path_tokens[i]]
ERROR nova TypeError: string indices must be integers
ERROR nova
[pid: 156048|app: 0|req: 5/9] 10.136.16.184 () {40 vars in 687 bytes} [Tue Mar 26 04:37:44 2024] GET /latest/meta-data/hostname/abc => generated 0 bytes in 82 msecs (HTTP/1.1 500) 0 headers in 0 bytes (0 switches on core 0)

** Affects: nova
     Importance: Undecided
         Status: New

-- 
You received this bug notification because you are a member of Yahoo!
Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/2059128

Title:
  Internal Server Error when attempring to use an incorrect URL within
  the metadata API

Status in OpenStack Compute (nova):
  New

Bug description:
  When trying to GET a non-existent metadata key within the VM, like
  '/latest/meta-data/hostname/abc', the Nova metadata service responses
  with a 500 HTTP status code:

  Inside a VM:

  $ curl http://169.254.169.254/latest/meta-data/hostname/abc
  <html>
   <head>
    <title>500 Internal Server Error</title>
   </head>
   <body>
    <h1>500 Internal Server Error</h1>
    An unknown error has occurred. Please try your request again.<br /><br />

   </body>
  </html>$

  
  The nova metadata service logs:

  CRITICAL nova [None req-3286f047-98c4-41c8-a11b-02a140fd2e4d None None] Unhandled error: TypeError: string indices must be integers
  ERROR nova Traceback (most recent call last):
  ERROR nova   File "/usr/local/lib/python3.9/site-packages/paste/urlmap.py", line 216, in __call__
  ERROR nova     return app(environ, start_response)
  ERROR nova   File "/usr/local/lib/python3.9/site-packages/webob/dec.py", line 129, in __call__
  ERROR nova     resp = self.call_func(req, *args, **kw)
  ERROR nova   File "/usr/local/lib/python3.9/site-packages/webob/dec.py", line 193, in call_func
  ERROR nova     return self.func(req, *args, **kwargs)
  ERROR nova   File "/usr/local/lib/python3.9/site-packages/oslo_middleware/base.py", line 124, in __call__
  ERROR nova     response = req.get_response(self.application)
  ERROR nova   File "/usr/local/lib/python3.9/site-packages/webob/request.py", line 1313, in send
  ERROR nova     status, headers, app_iter = self.call_application(
  ERROR nova   File "/usr/local/lib/python3.9/site-packages/webob/request.py", line 1278, in call_application
  ERROR nova     app_iter = application(self.environ, start_response)
  ERROR nova   File "/usr/local/lib/python3.9/site-packages/webob/dec.py", line 129, in __call__
  ERROR nova     resp = self.call_func(req, *args, **kw)
  ERROR nova   File "/usr/local/lib/python3.9/site-packages/webob/dec.py", line 193, in call_func
  ERROR nova     return self.func(req, *args, **kwargs)
  ERROR nova   File "/usr/local/lib/python3.9/site-packages/oslo_middleware/base.py", line 124, in __call__
  ERROR nova     response = req.get_response(self.application)
  ERROR nova   File "/usr/local/lib/python3.9/site-packages/webob/request.py", line 1313, in send
  ERROR nova     status, headers, app_iter = self.call_application(
  ERROR nova   File "/usr/local/lib/python3.9/site-packages/webob/request.py", line 1278, in call_application
  ERROR nova     app_iter = application(self.environ, start_response)
  ERROR nova   File "/usr/local/lib/python3.9/site-packages/webob/dec.py", line 129, in __call__
  ERROR nova     resp = self.call_func(req, *args, **kw)
  ERROR nova   File "/usr/local/lib/python3.9/site-packages/webob/dec.py", line 193, in call_func
  ERROR nova     return self.func(req, *args, **kwargs)
  ERROR nova   File "/opt/stack/nova/nova/api/metadata/handler.py", line 129, in __call__
  ERROR nova     data = meta_data.lookup(req.path_info)
  ERROR nova   File "/opt/stack/nova/nova/api/metadata/base.py", line 576, in lookup
  ERROR nova     data = self.get_ec2_item(path_tokens[1:])
  ERROR nova   File "/opt/stack/nova/nova/api/metadata/base.py", line 308, in get_ec2_item
  ERROR nova     return find_path_in_tree(data, path_tokens[1:])
  ERROR nova   File "/opt/stack/nova/nova/api/metadata/base.py", line 737, in find_path_in_tree
  ERROR nova     data = data[path_tokens[i]]
  ERROR nova TypeError: string indices must be integers
  ERROR nova
  [pid: 156048|app: 0|req: 5/9] 10.136.16.184 () {40 vars in 687 bytes} [Tue Mar 26 04:37:44 2024] GET /latest/meta-data/hostname/abc => generated 0 bytes in 82 msecs (HTTP/1.1 500) 0 headers in 0 bytes (0 switches on core 0)

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