mirror of https://github.com/dexidp/dex.git
Maksim Nabokikh
3 days ago
committed by
GitHub
17 changed files with 1336 additions and 4 deletions
@ -0,0 +1,232 @@
|
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package cel |
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|
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import ( |
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"context" |
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"fmt" |
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"reflect" |
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"github.com/google/cel-go/cel" |
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"github.com/google/cel-go/checker" |
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"github.com/google/cel-go/common/types/ref" |
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"github.com/google/cel-go/ext" |
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"github.com/dexidp/dex/pkg/cel/library" |
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) |
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// EnvironmentVersion represents the version of the CEL environment.
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// New variables, functions, or libraries are introduced in new versions.
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type EnvironmentVersion uint32 |
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const ( |
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// EnvironmentV1 is the initial CEL environment.
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EnvironmentV1 EnvironmentVersion = 1 |
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) |
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// CompilationResult holds a compiled CEL program ready for evaluation.
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type CompilationResult struct { |
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Program cel.Program |
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OutputType *cel.Type |
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Expression string |
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ast *cel.Ast |
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} |
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// CompilerOption configures a Compiler.
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type CompilerOption func(*compilerConfig) |
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type compilerConfig struct { |
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costBudget uint64 |
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version EnvironmentVersion |
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} |
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func defaultCompilerConfig() *compilerConfig { |
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return &compilerConfig{ |
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costBudget: DefaultCostBudget, |
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version: EnvironmentV1, |
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} |
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} |
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// WithCostBudget sets a custom cost budget for expression evaluation.
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func WithCostBudget(budget uint64) CompilerOption { |
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return func(cfg *compilerConfig) { |
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cfg.costBudget = budget |
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} |
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} |
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// WithVersion sets the target environment version for the compiler.
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// Defaults to the latest version. Specifying an older version ensures
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// that only functions/types available at that version are used.
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func WithVersion(v EnvironmentVersion) CompilerOption { |
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return func(cfg *compilerConfig) { |
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cfg.version = v |
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} |
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} |
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// Compiler compiles CEL expressions against a specific environment.
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type Compiler struct { |
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env *cel.Env |
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cfg *compilerConfig |
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} |
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// NewCompiler creates a new CEL compiler with the specified variable
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// declarations and options.
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//
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// All custom Dex libraries are automatically included.
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// The environment is configured with cost limits and safe defaults.
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func NewCompiler(variables []VariableDeclaration, opts ...CompilerOption) (*Compiler, error) { |
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cfg := defaultCompilerConfig() |
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for _, opt := range opts { |
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opt(cfg) |
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} |
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envOpts := make([]cel.EnvOption, 0, 8+len(variables)) |
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envOpts = append(envOpts, |
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cel.DefaultUTCTimeZone(true), |
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// Standard extension libraries (same set as Kubernetes)
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ext.Strings(), |
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ext.Encoders(), |
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ext.Lists(), |
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ext.Sets(), |
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ext.Math(), |
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// Native Go types for typed variable access.
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// This gives compile-time field checking: identity.emial → error at config load.
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ext.NativeTypes( |
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ext.ParseStructTags(true), |
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reflect.TypeOf(IdentityVal{}), |
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reflect.TypeOf(RequestVal{}), |
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), |
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// Custom Dex libraries
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cel.Lib(&library.Email{}), |
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cel.Lib(&library.Groups{}), |
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// Presence tests like has(field) and 'key' in map are O(1) hash
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// lookups on map(string, dyn) variables, so they should not count
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// toward the cost budget. Without this, expressions with multiple
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// 'in' checks (e.g. "'admin' in identity.groups") would accumulate
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// inflated cost estimates. This matches Kubernetes CEL behavior
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// where presence tests are free for CRD validation rules.
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cel.CostEstimatorOptions( |
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checker.PresenceTestHasCost(false), |
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), |
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) |
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for _, v := range variables { |
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envOpts = append(envOpts, cel.Variable(v.Name, v.Type)) |
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} |
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env, err := cel.NewEnv(envOpts...) |
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if err != nil { |
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return nil, fmt.Errorf("failed to create CEL environment: %w", err) |
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} |
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return &Compiler{env: env, cfg: cfg}, nil |
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} |
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// CompileBool compiles a CEL expression that must evaluate to bool.
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func (c *Compiler) CompileBool(expression string) (*CompilationResult, error) { |
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return c.compile(expression, cel.BoolType) |
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} |
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// CompileString compiles a CEL expression that must evaluate to string.
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func (c *Compiler) CompileString(expression string) (*CompilationResult, error) { |
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return c.compile(expression, cel.StringType) |
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} |
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// CompileStringList compiles a CEL expression that must evaluate to list(string).
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func (c *Compiler) CompileStringList(expression string) (*CompilationResult, error) { |
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return c.compile(expression, cel.ListType(cel.StringType)) |
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} |
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// Compile compiles a CEL expression with any output type.
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func (c *Compiler) Compile(expression string) (*CompilationResult, error) { |
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return c.compile(expression, nil) |
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} |
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func (c *Compiler) compile(expression string, expectedType *cel.Type) (*CompilationResult, error) { |
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if len(expression) > MaxExpressionLength { |
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return nil, fmt.Errorf("expression exceeds maximum length of %d characters", MaxExpressionLength) |
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} |
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ast, issues := c.env.Compile(expression) |
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if issues != nil && issues.Err() != nil { |
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return nil, fmt.Errorf("CEL compilation failed: %w", issues.Err()) |
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} |
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if expectedType != nil && !ast.OutputType().IsEquivalentType(expectedType) { |
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return nil, fmt.Errorf( |
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"expected expression output type %s, got %s", |
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expectedType, ast.OutputType(), |
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) |
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} |
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// Estimate cost at compile time and reject expressions that are too expensive.
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costEst, err := c.env.EstimateCost(ast, &defaultCostEstimator{}) |
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if err != nil { |
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return nil, fmt.Errorf("CEL cost estimation failed: %w", err) |
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} |
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if costEst.Max > c.cfg.costBudget { |
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return nil, fmt.Errorf( |
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"CEL expression estimated cost %d exceeds budget %d", |
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costEst.Max, c.cfg.costBudget, |
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) |
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} |
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prog, err := c.env.Program(ast, |
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cel.EvalOptions(cel.OptOptimize), |
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cel.CostLimit(c.cfg.costBudget), |
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) |
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if err != nil { |
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return nil, fmt.Errorf("CEL program creation failed: %w", err) |
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} |
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return &CompilationResult{ |
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Program: prog, |
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OutputType: ast.OutputType(), |
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Expression: expression, |
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ast: ast, |
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}, nil |
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} |
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// Eval evaluates a compiled program against the given variables.
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func Eval(ctx context.Context, result *CompilationResult, variables map[string]any) (ref.Val, error) { |
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out, _, err := result.Program.ContextEval(ctx, variables) |
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if err != nil { |
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return nil, fmt.Errorf("CEL evaluation failed: %w", err) |
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} |
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return out, nil |
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} |
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// EvalBool is a convenience function that evaluates and asserts bool output.
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func EvalBool(ctx context.Context, result *CompilationResult, variables map[string]any) (bool, error) { |
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out, err := Eval(ctx, result, variables) |
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if err != nil { |
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return false, err |
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} |
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v, ok := out.Value().(bool) |
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if !ok { |
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return false, fmt.Errorf("expected bool result, got %T", out.Value()) |
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} |
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return v, nil |
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} |
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// EvalString is a convenience function that evaluates and asserts string output.
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func EvalString(ctx context.Context, result *CompilationResult, variables map[string]any) (string, error) { |
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out, err := Eval(ctx, result, variables) |
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if err != nil { |
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return "", err |
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} |
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v, ok := out.Value().(string) |
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if !ok { |
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return "", fmt.Errorf("expected string result, got %T", out.Value()) |
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} |
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return v, nil |
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} |
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@ -0,0 +1,280 @@
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package cel_test |
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import ( |
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"context" |
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"strings" |
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"testing" |
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"github.com/stretchr/testify/assert" |
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"github.com/stretchr/testify/require" |
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"github.com/dexidp/dex/connector" |
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dexcel "github.com/dexidp/dex/pkg/cel" |
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) |
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func TestCompileBool(t *testing.T) { |
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compiler, err := dexcel.NewCompiler(nil) |
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require.NoError(t, err) |
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tests := map[string]struct { |
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expr string |
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wantErr bool |
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}{ |
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"true literal": { |
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expr: "true", |
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}, |
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"comparison": { |
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expr: "1 == 1", |
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}, |
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"string type mismatch": { |
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expr: "'hello'", |
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wantErr: true, |
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}, |
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"int type mismatch": { |
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expr: "42", |
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wantErr: true, |
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}, |
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} |
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for name, tc := range tests { |
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t.Run(name, func(t *testing.T) { |
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result, err := compiler.CompileBool(tc.expr) |
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if tc.wantErr { |
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assert.Error(t, err) |
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assert.Nil(t, result) |
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} else { |
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assert.NoError(t, err) |
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assert.NotNil(t, result) |
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} |
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}) |
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} |
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} |
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func TestCompileString(t *testing.T) { |
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compiler, err := dexcel.NewCompiler(nil) |
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require.NoError(t, err) |
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tests := map[string]struct { |
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expr string |
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wantErr bool |
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}{ |
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"string literal": { |
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expr: "'hello'", |
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}, |
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"string concatenation": { |
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expr: "'hello' + ' ' + 'world'", |
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}, |
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"bool type mismatch": { |
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expr: "true", |
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wantErr: true, |
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}, |
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} |
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for name, tc := range tests { |
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t.Run(name, func(t *testing.T) { |
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result, err := compiler.CompileString(tc.expr) |
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if tc.wantErr { |
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assert.Error(t, err) |
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} else { |
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assert.NoError(t, err) |
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assert.NotNil(t, result) |
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} |
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}) |
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} |
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} |
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func TestCompileStringList(t *testing.T) { |
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compiler, err := dexcel.NewCompiler(nil) |
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require.NoError(t, err) |
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result, err := compiler.CompileStringList("['a', 'b', 'c']") |
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assert.NoError(t, err) |
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assert.NotNil(t, result) |
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_, err = compiler.CompileStringList("'not a list'") |
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assert.Error(t, err) |
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} |
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func TestCompile(t *testing.T) { |
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compiler, err := dexcel.NewCompiler(nil) |
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require.NoError(t, err) |
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// Compile accepts any type
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result, err := compiler.Compile("true") |
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assert.NoError(t, err) |
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assert.NotNil(t, result) |
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result, err = compiler.Compile("'hello'") |
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assert.NoError(t, err) |
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assert.NotNil(t, result) |
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result, err = compiler.Compile("42") |
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assert.NoError(t, err) |
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assert.NotNil(t, result) |
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} |
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func TestCompileErrors(t *testing.T) { |
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compiler, err := dexcel.NewCompiler(nil) |
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require.NoError(t, err) |
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tests := map[string]struct { |
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expr string |
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}{ |
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"syntax error": { |
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expr: "1 +", |
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}, |
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"undefined variable": { |
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expr: "undefined_var", |
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}, |
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"undefined function": { |
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expr: "undefinedFunc()", |
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}, |
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} |
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for name, tc := range tests { |
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t.Run(name, func(t *testing.T) { |
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_, err := compiler.Compile(tc.expr) |
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assert.Error(t, err) |
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}) |
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} |
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} |
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func TestCompileRejectsUnknownFields(t *testing.T) { |
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vars := dexcel.IdentityVariables() |
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compiler, err := dexcel.NewCompiler(vars) |
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require.NoError(t, err) |
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// Typo in field name: should fail at compile time with ObjectType
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_, err = compiler.CompileBool("identity.emial == 'test@example.com'") |
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assert.Error(t, err) |
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assert.Contains(t, err.Error(), "compilation failed") |
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// Type mismatch: comparing string field to int should fail at compile time
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_, err = compiler.CompileBool("identity.email == 123") |
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assert.Error(t, err) |
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assert.Contains(t, err.Error(), "compilation failed") |
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// Valid field: should compile fine
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_, err = compiler.CompileBool("identity.email == 'test@example.com'") |
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assert.NoError(t, err) |
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} |
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func TestMaxExpressionLength(t *testing.T) { |
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compiler, err := dexcel.NewCompiler(nil) |
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require.NoError(t, err) |
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longExpr := "'" + strings.Repeat("a", dexcel.MaxExpressionLength) + "'" |
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_, err = compiler.Compile(longExpr) |
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assert.Error(t, err) |
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assert.Contains(t, err.Error(), "maximum length") |
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} |
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|
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func TestEvalBool(t *testing.T) { |
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vars := dexcel.IdentityVariables() |
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compiler, err := dexcel.NewCompiler(vars) |
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require.NoError(t, err) |
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|
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tests := map[string]struct { |
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expr string |
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identity dexcel.IdentityVal |
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want bool |
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}{ |
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"email endsWith": { |
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expr: "identity.email.endsWith('@example.com')", |
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identity: dexcel.IdentityVal{Email: "user@example.com"}, |
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want: true, |
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}, |
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"email endsWith false": { |
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expr: "identity.email.endsWith('@example.com')", |
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identity: dexcel.IdentityVal{Email: "user@other.com"}, |
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want: false, |
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}, |
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"email_verified": { |
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expr: "identity.email_verified == true", |
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identity: dexcel.IdentityVal{EmailVerified: true}, |
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want: true, |
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}, |
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"group membership": { |
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expr: "identity.groups.exists(g, g == 'admin')", |
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identity: dexcel.IdentityVal{Groups: []string{"admin", "dev"}}, |
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want: true, |
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}, |
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} |
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|
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for name, tc := range tests { |
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t.Run(name, func(t *testing.T) { |
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prog, err := compiler.CompileBool(tc.expr) |
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require.NoError(t, err) |
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|
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result, err := dexcel.EvalBool(context.Background(), prog, map[string]any{ |
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"identity": tc.identity, |
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}) |
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require.NoError(t, err) |
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assert.Equal(t, tc.want, result) |
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}) |
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} |
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} |
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|
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func TestEvalString(t *testing.T) { |
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vars := dexcel.IdentityVariables() |
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compiler, err := dexcel.NewCompiler(vars) |
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require.NoError(t, err) |
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|
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// With ObjectType, identity.email is typed as string, so CompileString works.
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prog, err := compiler.CompileString("identity.email") |
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require.NoError(t, err) |
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|
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result, err := dexcel.EvalString(context.Background(), prog, map[string]any{ |
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"identity": dexcel.IdentityVal{Email: "user@example.com"}, |
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}) |
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require.NoError(t, err) |
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assert.Equal(t, "user@example.com", result) |
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} |
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|
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func TestEvalWithIdentityAndRequest(t *testing.T) { |
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vars := append(dexcel.IdentityVariables(), dexcel.RequestVariables()...) |
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compiler, err := dexcel.NewCompiler(vars) |
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require.NoError(t, err) |
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|
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prog, err := compiler.CompileBool( |
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`identity.email.endsWith('@example.com') && 'admin' in identity.groups && request.connector_id == 'okta'`, |
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) |
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require.NoError(t, err) |
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|
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identity := dexcel.IdentityFromConnector(connector.Identity{ |
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UserID: "123", |
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Username: "john", |
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Email: "john@example.com", |
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Groups: []string{"admin", "dev"}, |
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}) |
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request := dexcel.RequestFromContext(dexcel.RequestContext{ |
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ClientID: "my-app", |
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ConnectorID: "okta", |
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Scopes: []string{"openid", "email"}, |
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}) |
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|
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result, err := dexcel.EvalBool(context.Background(), prog, map[string]any{ |
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"identity": identity, |
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"request": request, |
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}) |
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require.NoError(t, err) |
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assert.True(t, result) |
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} |
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|
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func TestNewCompilerWithVariables(t *testing.T) { |
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// Claims variable — remains map(string, dyn)
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compiler, err := dexcel.NewCompiler(dexcel.ClaimsVariable()) |
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require.NoError(t, err) |
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|
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// claims.email returns dyn from map access, use Compile (not CompileString)
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prog, err := compiler.Compile("claims.email") |
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require.NoError(t, err) |
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|
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result, err := dexcel.EvalString(context.Background(), prog, map[string]any{ |
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"claims": map[string]any{ |
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"email": "test@example.com", |
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}, |
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}) |
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require.NoError(t, err) |
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assert.Equal(t, "test@example.com", result) |
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} |
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@ -0,0 +1,105 @@
|
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package cel |
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|
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import ( |
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"fmt" |
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|
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"github.com/google/cel-go/checker" |
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) |
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|
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// DefaultCostBudget is the default cost budget for a single expression
|
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// evaluation. Aligned with Kubernetes defaults: enough for typical identity
|
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// operations but prevents runaway expressions.
|
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const DefaultCostBudget uint64 = 10_000_000 |
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|
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// MaxExpressionLength is the maximum length of a CEL expression string.
|
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const MaxExpressionLength = 10_240 |
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|
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// DefaultStringMaxLength is the estimated max length of string values
|
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// (emails, usernames, group names, etc.) used for compile-time cost estimation.
|
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const DefaultStringMaxLength = 256 |
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|
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// DefaultListMaxLength is the estimated max length of list values
|
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// (groups, scopes) used for compile-time cost estimation.
|
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const DefaultListMaxLength = 100 |
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|
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// CostEstimate holds the estimated cost range for a compiled expression.
|
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type CostEstimate struct { |
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Min uint64 |
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Max uint64 |
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} |
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|
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// EstimateCost returns the estimated cost range for a compiled expression.
|
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// This is computed statically at compile time without evaluating the expression.
|
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func (c *Compiler) EstimateCost(result *CompilationResult) (CostEstimate, error) { |
||||
costEst, err := c.env.EstimateCost(result.ast, &defaultCostEstimator{}) |
||||
if err != nil { |
||||
return CostEstimate{}, fmt.Errorf("CEL cost estimation failed: %w", err) |
||||
} |
||||
|
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return CostEstimate{Min: costEst.Min, Max: costEst.Max}, nil |
||||
} |
||||
|
||||
// defaultCostEstimator provides size hints for compile-time cost estimation.
|
||||
// Without these hints, the CEL cost estimator assumes unbounded sizes for
|
||||
// variables, leading to wildly overestimated max costs.
|
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type defaultCostEstimator struct{} |
||||
|
||||
func (defaultCostEstimator) EstimateSize(element checker.AstNode) *checker.SizeEstimate { |
||||
// Provide size hints for map(string, dyn) variables: identity, request, claims.
|
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// Without these, the estimator assumes lists/strings can be infinitely large.
|
||||
if element.Path() == nil { |
||||
return nil |
||||
} |
||||
|
||||
path := element.Path() |
||||
if len(path) == 0 { |
||||
return nil |
||||
} |
||||
|
||||
root := path[0] |
||||
|
||||
switch root { |
||||
case "identity", "request", "claims": |
||||
// Nested field access (e.g. identity.email, identity.groups)
|
||||
if len(path) >= 2 { |
||||
field := path[1] |
||||
switch field { |
||||
case "groups", "scopes": |
||||
// list(string) fields
|
||||
return &checker.SizeEstimate{Min: 0, Max: DefaultListMaxLength} |
||||
case "email_verified": |
||||
// bool field — size is always 1
|
||||
return &checker.SizeEstimate{Min: 1, Max: 1} |
||||
default: |
||||
// string fields (email, username, user_id, client_id, etc.)
|
||||
return &checker.SizeEstimate{Min: 0, Max: DefaultStringMaxLength} |
||||
} |
||||
} |
||||
// The map itself: number of keys
|
||||
return &checker.SizeEstimate{Min: 0, Max: 20} |
||||
} |
||||
|
||||
return nil |
||||
} |
||||
|
||||
func (defaultCostEstimator) EstimateCallCost(function, overloadID string, target *checker.AstNode, args []checker.AstNode) *checker.CallEstimate { |
||||
switch function { |
||||
case "dex.emailDomain", "dex.emailLocalPart": |
||||
// Simple string split — O(n) where n is string length, bounded.
|
||||
return &checker.CallEstimate{ |
||||
CostEstimate: checker.CostEstimate{Min: 1, Max: 2}, |
||||
} |
||||
case "dex.groupMatches": |
||||
// Iterates over groups list and matches each against a pattern.
|
||||
return &checker.CallEstimate{ |
||||
CostEstimate: checker.CostEstimate{Min: 1, Max: DefaultListMaxLength}, |
||||
} |
||||
case "dex.groupFilter": |
||||
// Builds a set from allowed list, then iterates groups.
|
||||
return &checker.CallEstimate{ |
||||
CostEstimate: checker.CostEstimate{Min: 1, Max: 2 * DefaultListMaxLength}, |
||||
} |
||||
} |
||||
|
||||
return nil |
||||
} |
||||
@ -0,0 +1,137 @@
|
||||
package cel_test |
||||
|
||||
import ( |
||||
"testing" |
||||
|
||||
"github.com/stretchr/testify/assert" |
||||
"github.com/stretchr/testify/require" |
||||
|
||||
dexcel "github.com/dexidp/dex/pkg/cel" |
||||
) |
||||
|
||||
func TestEstimateCost(t *testing.T) { |
||||
vars := dexcel.IdentityVariables() |
||||
compiler, err := dexcel.NewCompiler(vars) |
||||
require.NoError(t, err) |
||||
|
||||
tests := map[string]struct { |
||||
expr string |
||||
}{ |
||||
"simple bool": { |
||||
expr: "true", |
||||
}, |
||||
"string comparison": { |
||||
expr: "identity.email == 'test@example.com'", |
||||
}, |
||||
"group membership": { |
||||
expr: "identity.groups.exists(g, g == 'admin')", |
||||
}, |
||||
} |
||||
|
||||
for name, tc := range tests { |
||||
t.Run(name, func(t *testing.T) { |
||||
prog, err := compiler.Compile(tc.expr) |
||||
require.NoError(t, err) |
||||
|
||||
est, err := compiler.EstimateCost(prog) |
||||
require.NoError(t, err) |
||||
assert.True(t, est.Max >= est.Min, "max cost should be >= min cost") |
||||
assert.True(t, est.Max <= dexcel.DefaultCostBudget, |
||||
"estimated max cost %d should be within default budget %d", est.Max, dexcel.DefaultCostBudget) |
||||
}) |
||||
} |
||||
} |
||||
|
||||
func TestCompileTimeCostAcceptsSimpleExpressions(t *testing.T) { |
||||
vars := append(dexcel.IdentityVariables(), dexcel.RequestVariables()...) |
||||
compiler, err := dexcel.NewCompiler(vars) |
||||
require.NoError(t, err) |
||||
|
||||
tests := map[string]string{ |
||||
"literal": "true", |
||||
"email endsWith": "identity.email.endsWith('@example.com')", |
||||
"group check": "'admin' in identity.groups", |
||||
"emailDomain": `dex.emailDomain(identity.email)`, |
||||
"groupMatches": `dex.groupMatches(identity.groups, "team:*")`, |
||||
"groupFilter": `dex.groupFilter(identity.groups, ["admin", "dev"])`, |
||||
"combined policy": `identity.email.endsWith('@example.com') && 'admin' in identity.groups`, |
||||
"complex policy": `identity.email.endsWith('@example.com') && |
||||
identity.groups.exists(g, g == 'admin') && |
||||
request.connector_id == 'okta' && |
||||
request.scopes.exists(s, s == 'openid')`, |
||||
"filter+map chain": `identity.groups |
||||
.filter(g, g.startsWith('team:')) |
||||
.map(g, g.replace('team:', '')) |
||||
.size() > 0`, |
||||
} |
||||
|
||||
for name, expr := range tests { |
||||
t.Run(name, func(t *testing.T) { |
||||
_, err := compiler.Compile(expr) |
||||
assert.NoError(t, err, "expression should compile within default budget") |
||||
}) |
||||
} |
||||
} |
||||
|
||||
func TestCompileTimeCostRejection(t *testing.T) { |
||||
vars := append(dexcel.IdentityVariables(), dexcel.RequestVariables()...) |
||||
|
||||
tests := map[string]struct { |
||||
budget uint64 |
||||
expr string |
||||
}{ |
||||
"simple exists exceeds tiny budget": { |
||||
budget: 1, |
||||
expr: "identity.groups.exists(g, g == 'admin')", |
||||
}, |
||||
"endsWith exceeds tiny budget": { |
||||
budget: 2, |
||||
expr: "identity.email.endsWith('@example.com')", |
||||
}, |
||||
"nested comprehension over groups exceeds moderate budget": { |
||||
// Two nested iterations over groups: O(n^2) where n=100 → ~280K
|
||||
budget: 10_000, |
||||
expr: `identity.groups.exists(g1, |
||||
identity.groups.exists(g2, |
||||
g1 != g2 && g1.startsWith(g2) |
||||
) |
||||
)`, |
||||
}, |
||||
"cross-variable comprehension exceeds moderate budget": { |
||||
// filter groups then check each against scopes: O(n*m) → ~162K
|
||||
budget: 10_000, |
||||
expr: `identity.groups |
||||
.filter(g, g.startsWith('team:')) |
||||
.exists(g, request.scopes.exists(s, s == g))`, |
||||
}, |
||||
"chained filter+map+filter+map exceeds small budget": { |
||||
budget: 1000, |
||||
expr: `identity.groups |
||||
.filter(g, g.startsWith('team:')) |
||||
.map(g, g.replace('team:', '')) |
||||
.filter(g, g.size() > 3) |
||||
.map(g, g.upperAscii()) |
||||
.size() > 0`, |
||||
}, |
||||
"many independent exists exceeds small budget": { |
||||
budget: 5000, |
||||
expr: `identity.groups.exists(g, g.contains('a')) && |
||||
identity.groups.exists(g, g.contains('b')) && |
||||
identity.groups.exists(g, g.contains('c')) && |
||||
identity.groups.exists(g, g.contains('d')) && |
||||
identity.groups.exists(g, g.contains('e'))`, |
||||
}, |
||||
} |
||||
|
||||
for name, tc := range tests { |
||||
t.Run(name, func(t *testing.T) { |
||||
compiler, err := dexcel.NewCompiler(vars, dexcel.WithCostBudget(tc.budget)) |
||||
require.NoError(t, err) |
||||
|
||||
_, err = compiler.Compile(tc.expr) |
||||
assert.Error(t, err) |
||||
assert.Contains(t, err.Error(), "estimated cost") |
||||
assert.Contains(t, err.Error(), "exceeds budget") |
||||
}) |
||||
} |
||||
} |
||||
@ -0,0 +1,5 @@
|
||||
// Package cel provides a safe, sandboxed CEL (Common Expression Language)
|
||||
// environment for policy evaluation, claim mapping, and token customization
|
||||
// in Dex. It includes cost budgets, Kubernetes-grade compatibility guarantees,
|
||||
// and a curated set of extension libraries.
|
||||
package cel |
||||
@ -0,0 +1,4 @@
|
||||
// Package library provides custom CEL function libraries for Dex.
|
||||
// Each library implements the cel.Library interface and can be registered
|
||||
// in a CEL environment.
|
||||
package library |
||||
@ -0,0 +1,73 @@
|
||||
package library |
||||
|
||||
import ( |
||||
"strings" |
||||
|
||||
"github.com/google/cel-go/cel" |
||||
"github.com/google/cel-go/common/types" |
||||
"github.com/google/cel-go/common/types/ref" |
||||
) |
||||
|
||||
// Email provides email-related CEL functions.
|
||||
//
|
||||
// Functions (V1):
|
||||
//
|
||||
// dex.emailDomain(email: string) -> string
|
||||
// Returns the domain portion of an email address.
|
||||
// Example: dex.emailDomain("user@example.com") == "example.com"
|
||||
//
|
||||
// dex.emailLocalPart(email: string) -> string
|
||||
// Returns the local part of an email address.
|
||||
// Example: dex.emailLocalPart("user@example.com") == "user"
|
||||
type Email struct{} |
||||
|
||||
func (Email) CompileOptions() []cel.EnvOption { |
||||
return []cel.EnvOption{ |
||||
cel.Function("dex.emailDomain", |
||||
cel.Overload("dex_email_domain_string", |
||||
[]*cel.Type{cel.StringType}, |
||||
cel.StringType, |
||||
cel.UnaryBinding(emailDomainImpl), |
||||
), |
||||
), |
||||
cel.Function("dex.emailLocalPart", |
||||
cel.Overload("dex_email_local_part_string", |
||||
[]*cel.Type{cel.StringType}, |
||||
cel.StringType, |
||||
cel.UnaryBinding(emailLocalPartImpl), |
||||
), |
||||
), |
||||
} |
||||
} |
||||
|
||||
func (Email) ProgramOptions() []cel.ProgramOption { |
||||
return nil |
||||
} |
||||
|
||||
func emailDomainImpl(arg ref.Val) ref.Val { |
||||
email, ok := arg.Value().(string) |
||||
if !ok { |
||||
return types.NewErr("dex.emailDomain: expected string argument") |
||||
} |
||||
|
||||
_, domain, found := strings.Cut(email, "@") |
||||
if !found { |
||||
return types.String("") |
||||
} |
||||
|
||||
return types.String(domain) |
||||
} |
||||
|
||||
func emailLocalPartImpl(arg ref.Val) ref.Val { |
||||
email, ok := arg.Value().(string) |
||||
if !ok { |
||||
return types.NewErr("dex.emailLocalPart: expected string argument") |
||||
} |
||||
|
||||
localPart, _, found := strings.Cut(email, "@") |
||||
if !found { |
||||
return types.String(email) |
||||
} |
||||
|
||||
return types.String(localPart) |
||||
} |
||||
@ -0,0 +1,106 @@
|
||||
package library_test |
||||
|
||||
import ( |
||||
"context" |
||||
"testing" |
||||
|
||||
"github.com/stretchr/testify/assert" |
||||
"github.com/stretchr/testify/require" |
||||
|
||||
dexcel "github.com/dexidp/dex/pkg/cel" |
||||
) |
||||
|
||||
func TestEmailDomain(t *testing.T) { |
||||
compiler, err := dexcel.NewCompiler(nil) |
||||
require.NoError(t, err) |
||||
|
||||
tests := map[string]struct { |
||||
expr string |
||||
want string |
||||
}{ |
||||
"standard email": { |
||||
expr: `dex.emailDomain("user@example.com")`, |
||||
want: "example.com", |
||||
}, |
||||
"subdomain": { |
||||
expr: `dex.emailDomain("admin@sub.domain.org")`, |
||||
want: "sub.domain.org", |
||||
}, |
||||
"no at sign": { |
||||
expr: `dex.emailDomain("nodomain")`, |
||||
want: "", |
||||
}, |
||||
"empty string": { |
||||
expr: `dex.emailDomain("")`, |
||||
want: "", |
||||
}, |
||||
"multiple at signs": { |
||||
expr: `dex.emailDomain("user@name@example.com")`, |
||||
want: "name@example.com", |
||||
}, |
||||
} |
||||
|
||||
for name, tc := range tests { |
||||
t.Run(name, func(t *testing.T) { |
||||
prog, err := compiler.CompileString(tc.expr) |
||||
require.NoError(t, err) |
||||
|
||||
result, err := dexcel.EvalString(context.Background(), prog, map[string]any{}) |
||||
require.NoError(t, err) |
||||
assert.Equal(t, tc.want, result) |
||||
}) |
||||
} |
||||
} |
||||
|
||||
func TestEmailLocalPart(t *testing.T) { |
||||
compiler, err := dexcel.NewCompiler(nil) |
||||
require.NoError(t, err) |
||||
|
||||
tests := map[string]struct { |
||||
expr string |
||||
want string |
||||
}{ |
||||
"standard email": { |
||||
expr: `dex.emailLocalPart("user@example.com")`, |
||||
want: "user", |
||||
}, |
||||
"no at sign": { |
||||
expr: `dex.emailLocalPart("justuser")`, |
||||
want: "justuser", |
||||
}, |
||||
"empty string": { |
||||
expr: `dex.emailLocalPart("")`, |
||||
want: "", |
||||
}, |
||||
"multiple at signs": { |
||||
expr: `dex.emailLocalPart("user@name@example.com")`, |
||||
want: "user", |
||||
}, |
||||
} |
||||
|
||||
for name, tc := range tests { |
||||
t.Run(name, func(t *testing.T) { |
||||
prog, err := compiler.CompileString(tc.expr) |
||||
require.NoError(t, err) |
||||
|
||||
result, err := dexcel.EvalString(context.Background(), prog, map[string]any{}) |
||||
require.NoError(t, err) |
||||
assert.Equal(t, tc.want, result) |
||||
}) |
||||
} |
||||
} |
||||
|
||||
func TestEmailDomainWithIdentityVariable(t *testing.T) { |
||||
vars := dexcel.IdentityVariables() |
||||
compiler, err := dexcel.NewCompiler(vars) |
||||
require.NoError(t, err) |
||||
|
||||
prog, err := compiler.CompileString(`dex.emailDomain(identity.email)`) |
||||
require.NoError(t, err) |
||||
|
||||
result, err := dexcel.EvalString(context.Background(), prog, map[string]any{ |
||||
"identity": dexcel.IdentityVal{Email: "admin@corp.example.com"}, |
||||
}) |
||||
require.NoError(t, err) |
||||
assert.Equal(t, "corp.example.com", result) |
||||
} |
||||
@ -0,0 +1,123 @@
|
||||
package library |
||||
|
||||
import ( |
||||
"path" |
||||
|
||||
"github.com/google/cel-go/cel" |
||||
"github.com/google/cel-go/common/types" |
||||
"github.com/google/cel-go/common/types/ref" |
||||
"github.com/google/cel-go/common/types/traits" |
||||
) |
||||
|
||||
// Groups provides group-related CEL functions.
|
||||
//
|
||||
// Functions (V1):
|
||||
//
|
||||
// dex.groupMatches(groups: list(string), pattern: string) -> list(string)
|
||||
// Returns groups matching a glob pattern.
|
||||
// Example: dex.groupMatches(["team:dev", "team:ops", "admin"], "team:*")
|
||||
//
|
||||
// dex.groupFilter(groups: list(string), allowed: list(string)) -> list(string)
|
||||
// Returns only groups present in the allowed list.
|
||||
// Example: dex.groupFilter(["admin", "dev", "ops"], ["admin", "ops"])
|
||||
type Groups struct{} |
||||
|
||||
func (Groups) CompileOptions() []cel.EnvOption { |
||||
return []cel.EnvOption{ |
||||
cel.Function("dex.groupMatches", |
||||
cel.Overload("dex_group_matches_list_string", |
||||
[]*cel.Type{cel.ListType(cel.StringType), cel.StringType}, |
||||
cel.ListType(cel.StringType), |
||||
cel.BinaryBinding(groupMatchesImpl), |
||||
), |
||||
), |
||||
cel.Function("dex.groupFilter", |
||||
cel.Overload("dex_group_filter_list_list", |
||||
[]*cel.Type{cel.ListType(cel.StringType), cel.ListType(cel.StringType)}, |
||||
cel.ListType(cel.StringType), |
||||
cel.BinaryBinding(groupFilterImpl), |
||||
), |
||||
), |
||||
} |
||||
} |
||||
|
||||
func (Groups) ProgramOptions() []cel.ProgramOption { |
||||
return nil |
||||
} |
||||
|
||||
func groupMatchesImpl(lhs, rhs ref.Val) ref.Val { |
||||
groupList, ok := lhs.(traits.Lister) |
||||
if !ok { |
||||
return types.NewErr("dex.groupMatches: expected list(string) as first argument") |
||||
} |
||||
|
||||
pattern, ok := rhs.Value().(string) |
||||
if !ok { |
||||
return types.NewErr("dex.groupMatches: expected string pattern as second argument") |
||||
} |
||||
|
||||
iter := groupList.Iterator() |
||||
var matched []ref.Val |
||||
|
||||
for iter.HasNext() == types.True { |
||||
item := iter.Next() |
||||
|
||||
group, ok := item.Value().(string) |
||||
if !ok { |
||||
continue |
||||
} |
||||
|
||||
ok, err := path.Match(pattern, group) |
||||
if err != nil { |
||||
return types.NewErr("dex.groupMatches: invalid pattern %q: %v", pattern, err) |
||||
} |
||||
if ok { |
||||
matched = append(matched, types.String(group)) |
||||
} |
||||
} |
||||
|
||||
return types.NewRefValList(types.DefaultTypeAdapter, matched) |
||||
} |
||||
|
||||
func groupFilterImpl(lhs, rhs ref.Val) ref.Val { |
||||
groupList, ok := lhs.(traits.Lister) |
||||
if !ok { |
||||
return types.NewErr("dex.groupFilter: expected list(string) as first argument") |
||||
} |
||||
|
||||
allowedList, ok := rhs.(traits.Lister) |
||||
if !ok { |
||||
return types.NewErr("dex.groupFilter: expected list(string) as second argument") |
||||
} |
||||
|
||||
allowed := make(map[string]struct{}) |
||||
iter := allowedList.Iterator() |
||||
for iter.HasNext() == types.True { |
||||
item := iter.Next() |
||||
|
||||
s, ok := item.Value().(string) |
||||
if !ok { |
||||
continue |
||||
} |
||||
|
||||
allowed[s] = struct{}{} |
||||
} |
||||
|
||||
var filtered []ref.Val |
||||
iter = groupList.Iterator() |
||||
|
||||
for iter.HasNext() == types.True { |
||||
item := iter.Next() |
||||
|
||||
group, ok := item.Value().(string) |
||||
if !ok { |
||||
continue |
||||
} |
||||
|
||||
if _, exists := allowed[group]; exists { |
||||
filtered = append(filtered, types.String(group)) |
||||
} |
||||
} |
||||
|
||||
return types.NewRefValList(types.DefaultTypeAdapter, filtered) |
||||
} |
||||
@ -0,0 +1,141 @@
|
||||
package library_test |
||||
|
||||
import ( |
||||
"context" |
||||
"reflect" |
||||
"testing" |
||||
|
||||
"github.com/stretchr/testify/assert" |
||||
"github.com/stretchr/testify/require" |
||||
|
||||
dexcel "github.com/dexidp/dex/pkg/cel" |
||||
) |
||||
|
||||
func TestGroupMatches(t *testing.T) { |
||||
vars := dexcel.IdentityVariables() |
||||
compiler, err := dexcel.NewCompiler(vars) |
||||
require.NoError(t, err) |
||||
|
||||
tests := map[string]struct { |
||||
expr string |
||||
groups []string |
||||
want []string |
||||
}{ |
||||
"wildcard pattern": { |
||||
expr: `dex.groupMatches(identity.groups, "team:*")`, |
||||
groups: []string{"team:dev", "team:ops", "admin"}, |
||||
want: []string{"team:dev", "team:ops"}, |
||||
}, |
||||
"exact match": { |
||||
expr: `dex.groupMatches(identity.groups, "admin")`, |
||||
groups: []string{"team:dev", "admin", "user"}, |
||||
want: []string{"admin"}, |
||||
}, |
||||
"no matches": { |
||||
expr: `dex.groupMatches(identity.groups, "nonexistent")`, |
||||
groups: []string{"team:dev", "admin"}, |
||||
want: []string{}, |
||||
}, |
||||
"question mark pattern": { |
||||
expr: `dex.groupMatches(identity.groups, "team?")`, |
||||
groups: []string{"teamA", "teamB", "teams-long"}, |
||||
want: []string{"teamA", "teamB"}, |
||||
}, |
||||
"match all": { |
||||
expr: `dex.groupMatches(identity.groups, "*")`, |
||||
groups: []string{"a", "b", "c"}, |
||||
want: []string{"a", "b", "c"}, |
||||
}, |
||||
} |
||||
|
||||
for name, tc := range tests { |
||||
t.Run(name, func(t *testing.T) { |
||||
prog, err := compiler.CompileStringList(tc.expr) |
||||
require.NoError(t, err) |
||||
|
||||
out, err := dexcel.Eval(context.Background(), prog, map[string]any{ |
||||
"identity": dexcel.IdentityVal{Groups: tc.groups}, |
||||
}) |
||||
require.NoError(t, err) |
||||
|
||||
nativeVal, err := out.ConvertToNative(reflect.TypeOf([]string{})) |
||||
require.NoError(t, err) |
||||
|
||||
got, ok := nativeVal.([]string) |
||||
require.True(t, ok, "expected []string, got %T", nativeVal) |
||||
assert.Equal(t, tc.want, got) |
||||
}) |
||||
} |
||||
} |
||||
|
||||
func TestGroupMatchesInvalidPattern(t *testing.T) { |
||||
vars := dexcel.IdentityVariables() |
||||
compiler, err := dexcel.NewCompiler(vars) |
||||
require.NoError(t, err) |
||||
|
||||
prog, err := compiler.CompileStringList(`dex.groupMatches(identity.groups, "[invalid")`) |
||||
require.NoError(t, err) |
||||
|
||||
_, err = dexcel.Eval(context.Background(), prog, map[string]any{ |
||||
"identity": dexcel.IdentityVal{Groups: []string{"admin"}}, |
||||
}) |
||||
require.Error(t, err) |
||||
assert.Contains(t, err.Error(), "invalid pattern") |
||||
} |
||||
|
||||
func TestGroupFilter(t *testing.T) { |
||||
vars := dexcel.IdentityVariables() |
||||
compiler, err := dexcel.NewCompiler(vars) |
||||
require.NoError(t, err) |
||||
|
||||
tests := map[string]struct { |
||||
expr string |
||||
groups []string |
||||
want []string |
||||
}{ |
||||
"filter to allowed": { |
||||
expr: `dex.groupFilter(identity.groups, ["admin", "ops"])`, |
||||
groups: []string{"admin", "dev", "ops"}, |
||||
want: []string{"admin", "ops"}, |
||||
}, |
||||
"no overlap": { |
||||
expr: `dex.groupFilter(identity.groups, ["marketing"])`, |
||||
groups: []string{"admin", "dev"}, |
||||
want: []string{}, |
||||
}, |
||||
"all allowed": { |
||||
expr: `dex.groupFilter(identity.groups, ["a", "b", "c"])`, |
||||
groups: []string{"a", "b", "c"}, |
||||
want: []string{"a", "b", "c"}, |
||||
}, |
||||
"empty allowed list": { |
||||
expr: `dex.groupFilter(identity.groups, [])`, |
||||
groups: []string{"admin", "dev"}, |
||||
want: []string{}, |
||||
}, |
||||
"preserves order": { |
||||
expr: `dex.groupFilter(identity.groups, ["z", "a"])`, |
||||
groups: []string{"a", "b", "z"}, |
||||
want: []string{"a", "z"}, |
||||
}, |
||||
} |
||||
|
||||
for name, tc := range tests { |
||||
t.Run(name, func(t *testing.T) { |
||||
prog, err := compiler.CompileStringList(tc.expr) |
||||
require.NoError(t, err) |
||||
|
||||
out, err := dexcel.Eval(context.Background(), prog, map[string]any{ |
||||
"identity": dexcel.IdentityVal{Groups: tc.groups}, |
||||
}) |
||||
require.NoError(t, err) |
||||
|
||||
nativeVal, err := out.ConvertToNative(reflect.TypeOf([]string{})) |
||||
require.NoError(t, err) |
||||
|
||||
got, ok := nativeVal.([]string) |
||||
require.True(t, ok, "expected []string, got %T", nativeVal) |
||||
assert.Equal(t, tc.want, got) |
||||
}) |
||||
} |
||||
} |
||||
@ -0,0 +1,109 @@
|
||||
package cel |
||||
|
||||
import ( |
||||
"github.com/google/cel-go/cel" |
||||
|
||||
"github.com/dexidp/dex/connector" |
||||
) |
||||
|
||||
// VariableDeclaration declares a named variable and its CEL type
|
||||
// that will be available in expressions.
|
||||
type VariableDeclaration struct { |
||||
Name string |
||||
Type *cel.Type |
||||
} |
||||
|
||||
// IdentityVal is the CEL native type for the identity variable.
|
||||
// Fields are typed so that the CEL compiler rejects unknown field access
|
||||
// (e.g. identity.emial) at config load time rather than at evaluation time.
|
||||
type IdentityVal struct { |
||||
UserID string `cel:"user_id"` |
||||
Username string `cel:"username"` |
||||
PreferredUsername string `cel:"preferred_username"` |
||||
Email string `cel:"email"` |
||||
EmailVerified bool `cel:"email_verified"` |
||||
Groups []string `cel:"groups"` |
||||
} |
||||
|
||||
// RequestVal is the CEL native type for the request variable.
|
||||
type RequestVal struct { |
||||
ClientID string `cel:"client_id"` |
||||
ConnectorID string `cel:"connector_id"` |
||||
Scopes []string `cel:"scopes"` |
||||
RedirectURI string `cel:"redirect_uri"` |
||||
} |
||||
|
||||
// identityTypeName is the CEL type name for IdentityVal.
|
||||
// Derived by ext.NativeTypes as simplePkgAlias(pkgPath) + "." + structName.
|
||||
const identityTypeName = "cel.IdentityVal" |
||||
|
||||
// requestTypeName is the CEL type name for RequestVal.
|
||||
const requestTypeName = "cel.RequestVal" |
||||
|
||||
// IdentityVariables provides the 'identity' variable with typed fields.
|
||||
//
|
||||
// identity.user_id — string
|
||||
// identity.username — string
|
||||
// identity.preferred_username — string
|
||||
// identity.email — string
|
||||
// identity.email_verified — bool
|
||||
// identity.groups — list(string)
|
||||
func IdentityVariables() []VariableDeclaration { |
||||
return []VariableDeclaration{ |
||||
{Name: "identity", Type: cel.ObjectType(identityTypeName)}, |
||||
} |
||||
} |
||||
|
||||
// RequestVariables provides the 'request' variable with typed fields.
|
||||
//
|
||||
// request.client_id — string
|
||||
// request.connector_id — string
|
||||
// request.scopes — list(string)
|
||||
// request.redirect_uri — string
|
||||
func RequestVariables() []VariableDeclaration { |
||||
return []VariableDeclaration{ |
||||
{Name: "request", Type: cel.ObjectType(requestTypeName)}, |
||||
} |
||||
} |
||||
|
||||
// ClaimsVariable provides a 'claims' map for raw upstream claims.
|
||||
// Claims remain map(string, dyn) because their shape is genuinely
|
||||
// unknown — they carry arbitrary upstream IdP data.
|
||||
//
|
||||
// claims — map(string, dyn)
|
||||
func ClaimsVariable() []VariableDeclaration { |
||||
return []VariableDeclaration{ |
||||
{Name: "claims", Type: cel.MapType(cel.StringType, cel.DynType)}, |
||||
} |
||||
} |
||||
|
||||
// IdentityFromConnector converts a connector.Identity to a CEL-compatible IdentityVal.
|
||||
func IdentityFromConnector(id connector.Identity) IdentityVal { |
||||
return IdentityVal{ |
||||
UserID: id.UserID, |
||||
Username: id.Username, |
||||
PreferredUsername: id.PreferredUsername, |
||||
Email: id.Email, |
||||
EmailVerified: id.EmailVerified, |
||||
Groups: id.Groups, |
||||
} |
||||
} |
||||
|
||||
// RequestContext represents the authentication/token request context
|
||||
// available as the 'request' variable in CEL expressions.
|
||||
type RequestContext struct { |
||||
ClientID string |
||||
ConnectorID string |
||||
Scopes []string |
||||
RedirectURI string |
||||
} |
||||
|
||||
// RequestFromContext converts a RequestContext to a CEL-compatible RequestVal.
|
||||
func RequestFromContext(rc RequestContext) RequestVal { |
||||
return RequestVal{ |
||||
ClientID: rc.ClientID, |
||||
ConnectorID: rc.ConnectorID, |
||||
Scopes: rc.Scopes, |
||||
RedirectURI: rc.RedirectURI, |
||||
} |
||||
} |
||||
@ -0,0 +1,3 @@
|
||||
// Package featureflags provides a mechanism for toggling experimental or
|
||||
// optional Dex features via environment variables (DEX_<FLAG_NAME>).
|
||||
package featureflags |
||||
@ -0,0 +1,2 @@
|
||||
// Package groups contains helper functions related to groups.
|
||||
package groups |
||||
Loading…
Reference in new issue