[keycloak] Accept client credentials for token endpoint in Authorization header #336
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mayorova
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apicast/src/oauth/keycloak.lua
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| @@ -248,7 +262,8 @@ function _M:get_token(service, client) | |||
| -- call Keycloak authorize | |||
| local url = self.config.token_url | |||
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| local res = http_client.post(url, req_body) | |||
| local headers = ngx.req.get_headers() | |||
| local res = http_client.post(url, ngx.req.get_post_args(), { headers = headers }) | |||
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I don't see any test covering why it should pass all request headers to the keycloak endpoint. Why it should do that? Shouldn't it be just some whitelist of headers?
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There is a test that verifies that headers are passed at all: https://github.com/3scale/apicast/pull/336/files/8cd98a1f55125a836cd94603cca2223460d0d716#diff-bc82c1966e003ef46c8dc5a71bb64c5d
Because they were not before, so the test would fail.
Now, regarding all headers VS whitelist, for now I really only need the Authorization header, but I am not sure if there can be some other headers that Keycloak may be expecting.
We can limit it to Authorization for now, and test that others are not proxy passed (although not sure how to do it with test backend).
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Test backend can just expect headers that are passed. Like
test_backend.expect{ url = 'http://example.com/t', headers = { ['User-Agent'] = tostring(user_agent) } }
.respond_with{ status = 200 }IMO we should limit what is sent to Keycloak according to the spec/documentation and not whatever client sends.
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Re: testing, yes, there is a test that checks the authorization header is passed (link, the previous one was not correct), but I don't know how to check that other headers were not passed. Could be an integration test, but maybe not so necessary?
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I think one positive test will be fine (checking that the Authorization is passed) and if we have to stub some method that returns a table then we can add some extra headers there and see that they are not in keycloak.
apicast/src/oauth/keycloak.lua
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| local creds = _M.get_client_credentials(params) | ||
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| params.client_id = creds.client_id | ||
| params.client_secret = creds.client_secret |
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Why mutating and using params instead of using creds ?
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Because token_check_params needs all params + credentials (if they are not in params, they should be taken from headers). Happy to try something different.
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I see. Well I guess it is fine for now and will be refactored when we will rewrite OAuth from scratch.
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apicast/src/oauth/keycloak.lua
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| -- currently only passing the Authorization header used for the client authentication | ||
| function _M.token_get_headers() | ||
| local auth = ngx.var.http_authorization | ||
| return auth and { ['Authorization'] = auth } or {} |
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I think this would be the same:
return { ['Authorization'] = ngx.var.http_authorization }Because { whatever = nil } is {}.
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[keycloak] Only pass Authorization header from client to Keycloak
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Close #319