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Add open policy agent filters (#2407)
* Add Open Policy Agent based filters opaAuthorizeRequest() and opaServeResponse() see also https://opensource.zalando.com/skipper/reference/filters/#open-policy-agent Signed-off-by: Magnus Jungsbluth <[email protected]> Signed-off-by: Sandor Szücs <[email protected]> Co-authored-by: Sandor Szücs <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| package openpolicyagent | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "time" | ||
|
|
||
| ext_authz_v3 "github.com/envoyproxy/go-control-plane/envoy/service/auth/v3" | ||
| "github.com/open-policy-agent/opa-envoy-plugin/envoyauth" | ||
| "github.com/open-policy-agent/opa-envoy-plugin/opa/decisionlog" | ||
| "github.com/open-policy-agent/opa/ast" | ||
| "github.com/open-policy-agent/opa/rego" | ||
| "github.com/open-policy-agent/opa/server" | ||
| "github.com/open-policy-agent/opa/tracing" | ||
| "github.com/opentracing/opentracing-go" | ||
| ) | ||
|
|
||
| func (opa *OpenPolicyAgentInstance) Eval(ctx context.Context, req *ext_authz_v3.CheckRequest) (*envoyauth.EvalResult, error) { | ||
| result, stopeval, err := envoyauth.NewEvalResult() | ||
| span := opentracing.SpanFromContext(ctx) | ||
| if span != nil { | ||
| span.SetTag("opa.decision_id", result.DecisionID) | ||
| } | ||
|
|
||
| if err != nil { | ||
| opa.Logger().WithFields(map[string]interface{}{"err": err}).Error("Unable to generate decision ID.") | ||
| return nil, err | ||
| } | ||
|
|
||
| var input map[string]interface{} | ||
| defer func() { | ||
| stopeval() | ||
| err := opa.logDecision(ctx, input, result, err) | ||
| if err != nil { | ||
| opa.Logger().WithFields(map[string]interface{}{"err": err}).Error("Unable to log decision to control plane.") | ||
| } | ||
| }() | ||
|
|
||
| if ctx.Err() != nil { | ||
| return nil, fmt.Errorf("check request timed out before query execution: %w", ctx.Err()) | ||
| } | ||
|
|
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| logger := opa.manager.Logger().WithFields(map[string]interface{}{"decision-id": result.DecisionID}) | ||
| input, err = envoyauth.RequestToInput(req, logger, nil, true) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to convert request to input: %w", err) | ||
| } | ||
|
|
||
| inputValue, err := ast.InterfaceToValue(input) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| err = envoyauth.Eval(ctx, opa, inputValue, result, rego.DistributedTracingOpts(tracing.Options{opa})) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return result, nil | ||
| } | ||
|
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| func (opa *OpenPolicyAgentInstance) logDecision(ctx context.Context, input interface{}, result *envoyauth.EvalResult, err error) error { | ||
| info := &server.Info{ | ||
| Timestamp: time.Now(), | ||
| Input: &input, | ||
| } | ||
|
|
||
| if opa.EnvoyPluginConfig().Path != "" { | ||
| info.Path = opa.EnvoyPluginConfig().Path | ||
| } | ||
|
|
||
| return decisionlog.LogDecision(ctx, opa.manager, info, result, err) | ||
| } |
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