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Very rough draft for supporting both keycloak and cas #187

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Very rough draft for supporting both keycloak and cas #187

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34 changes: 33 additions & 1 deletion policy/diamond/policy/token/token.rego
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Original file line number Diff line number Diff line change
@@ -1,11 +1,43 @@
package diamond.policy.token

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File should be formatted with `opa fmt`. To learn more, see: https://docs.styra.com/regal/rules/style/opa-fmt

import rego.v1

verify(token) := profile.sub if {
verify_cas(token) := profile.sub if {
profile := http.send({
"url": opa.runtime().env.USERINFO_ENDPOINT,
"method": "GET",
"headers": {"authorization": token},
})
}

verify_keycloak(token) := claims if {

fetch_jwks(url) := http.send({
"url": jwks_url,
"method": "GET",
"force_cache": true,
"force_cache_duration_seconds": 86400,
})

jwks_endpoint := opa.runtime().env.JWKS_ENDPOINT

unverified := io.jwt.decode(token)

jwt_header := unverified[0]

jwks_url := concat("?", [jwks_endpoint, urlquery.encode_object({"kid": jwt_header.kid})])

jwks := fetch_jwks(jwks_url).raw_body

valid := io.jwt.decode_verify(token, {
"cert": jwks,
"iss": "https://authn.diamond.ac.uk/realms/master",
"aud": "account",
})

claims := valid[2]

}

verify if verify_cas(input.token)
verify if verify_keycloak(input.token)
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