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Enhance the OpenAPI plugin to accept user-provided values for parameters #17339

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This is a patch for #17315

Main changes:

  • Added parameter_values_location configuration option for the OpenAPI plugin. The option allows to set a path to a YAML file which contains context-specific parameter values.
  • Added ParameterValues class which can load context-specific parameter values from a YAML file. The file contains a mapping { path, parameter name } -> list of values . Currently, it doesn't use an HTTP method but it can be easily updated. For in: body parameter type, a user can specify a JSON payload, but it's not currently possible to specify a value for a particular field in the JSON payload.
  • Updated ParameterHandler to use context-specific parameter values. If a user provided custom parameter values, then the class prefers them, and tries to enumerate all possible combinations of the specified parameters.
  • Fixed a possible null-dereference in get_uri() method.
  • Added a couple of tests.

I am testing the feature on a couple of applications but would like to start a review now to get feedback earlier.

@artem-smotrakov
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I have tested it with a couple of applications - it worked well.

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@andresriancho andresriancho left a comment

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Awesome!

Loads parameter values from YAML.
:param string: Definition of parameter values in YAML.
"""
content = yaml.load(string)
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User might enter an invalid YAML, that case should be handled.

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Okay, I'll add a try-except block to catch YAMLError and wrap the exception in to ParameterValueParsingError.

h = ('This option sets a path to a YAML file which contains parameter values'
' which should be used in testing API endpoints. If no parameter values are provided,'
' the plugin tries to guess them.')
o = opt_factory('parameter_values_location', self._parameter_values_location, d, INPUT_FILE, help=h)
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Maybe the YAML format validation should be done here? That could be done by changing the INPUT_FILE type to YAML_INPUT_FILE and creating the logic for handling that.

It should be fairly easy, take a look at:

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Hmm, that may be nice. Although input_file_option.py doesn't look that simple at first glance :) Okay, I'll see what I can do here.

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Yeah, input_file_option.py doesn't look simple, but yaml_file_option.py should be simple :-)

Take a look at the other files in the same directory, those will give you ideas on how simple the inputs can actually be.

h = ('This option sets a path to a YAML file which contains parameter values'
' which should be used in testing API endpoints. If no parameter values are provided,'
' the plugin tries to guess them.')
o = opt_factory('parameter_values_location', self._parameter_values_location, d, INPUT_FILE, help=h)
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parameter_values_location should be changed to parameter_values_file (that is how input files are usually named)

o = opt_factory('output_file', self._output_file_name, d, OUTPUT_FILE)

o = opt_factory('output_file', self._file_name, d, OUTPUT_FILE)

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Sure, no problem. Then, custom_spec_location should be probably renamed to custom_spec_file

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Yes please

- 1234567
- name: birth-date
values:
- 2000-01-02
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I believe that this feature requires its own documentation in https://github.com/andresriancho/w3af/blob/develop/doc/sphinx/scan-rest-apis.rst

I would make the example in get_long_desc shorter, and reference users to the documentation with something like: "For more information and examples about this feature read the framework documentation at https://docs.w3af.org"

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Okay, I'll update both description and docs. In fact, the docs need to be updated with descriptions of the recent changes/features. I hope I can find time to do that.

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I need to work harder on merging your PR. If I don't do that I'll end up in a branch merge nightmare.

Sorry for not being more responsive with these PRs. I was on vacations. Will try to merge all these amazing things you've been working on to develop as soon as the comments are solved.

@artem-smotrakov
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Thanks for your comments. Let's work on them one by one, and I'll resolve possible conflicts which may appear. Then, it should be easier to merge them to develop.

@artem-smotrakov
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I have updated the patch:

  • Renamed configuration parameters in the crawl.open_api plugin.
  • Added YAML_INPUT_FILE option type.
  • Updated docs and description for the crawl.open_api plugin.
  • The crawl.open_api plugin now expects an invalid YAML file.
  • Added TestOpenAPICustomParameterValues for the new configuration option.
  • Added TestOpenAPICustomSpec for custom_spec_file configuration option.

@artem-smotrakov
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@andresriancho When you have some time, could you please take a look at this pull request? I have also updated other pull requests and added several comments - looking for a review. Thanks!

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