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fix(authz): added a helper function to the policy engine to simplify (#…
…3419) auth method verification Signed-off-by: Roman Dmytrenko <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| package ext | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
|
|
||
| "github.com/open-policy-agent/opa/ast" | ||
| "github.com/open-policy-agent/opa/rego" | ||
| "github.com/open-policy-agent/opa/types" | ||
| authrpc "go.flipt.io/flipt/rpc/flipt/auth" | ||
| ) | ||
|
|
||
| func init() { | ||
| rego.RegisterBuiltin2(®o.Function{ | ||
| Name: "flipt.is_auth_method", | ||
| Decl: types.NewFunction(types.Args(types.A, types.S), types.B), | ||
| }, isAuthMethod) | ||
| } | ||
|
|
||
| var labelMethodTable = map[string]*ast.Term{ | ||
| "token": ast.IntNumberTerm(int(authrpc.Method_METHOD_TOKEN.Number())), | ||
| "oidc": ast.IntNumberTerm(int(authrpc.Method_METHOD_OIDC.Number())), | ||
| "kubernetes": ast.IntNumberTerm(int(authrpc.Method_METHOD_KUBERNETES.Number())), | ||
| "k8s": ast.IntNumberTerm(int(authrpc.Method_METHOD_KUBERNETES.Number())), | ||
| "github": ast.IntNumberTerm(int(authrpc.Method_METHOD_GITHUB.Number())), | ||
| "jwt": ast.IntNumberTerm(int(authrpc.Method_METHOD_JWT.Number())), | ||
| "cloud": ast.IntNumberTerm(int(authrpc.Method_METHOD_CLOUD.Number())), | ||
| } | ||
|
|
||
| var ( | ||
| errNoAuthenticationFound = errors.New("no authentication found") | ||
| authTerm = ast.StringTerm("authentication") | ||
| methodTerm = ast.StringTerm("method") | ||
| ) | ||
|
|
||
| func isAuthMethod(_ rego.BuiltinContext, input, key *ast.Term) (*ast.Term, error) { | ||
| var authMethod string | ||
| if err := ast.As(key.Value, &authMethod); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| methodCode, ok := labelMethodTable[authMethod] | ||
| if !ok { | ||
| return nil, fmt.Errorf("unsupported auth method %s", authMethod) | ||
| } | ||
|
|
||
| auth := input.Get(authTerm) | ||
| if auth == nil { | ||
| return nil, errNoAuthenticationFound | ||
| } | ||
|
|
||
| return ast.BooleanTerm(methodCode.Equal(auth.Get(methodTerm))), nil | ||
| } |
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