303 lines
8.3 KiB
Go
303 lines
8.3 KiB
Go
package vault
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import (
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"errors"
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"fmt"
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"strings"
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"time"
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"github.com/hashicorp/errwrap"
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"github.com/hashicorp/go-multierror"
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"github.com/hashicorp/hcl"
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"github.com/hashicorp/hcl/hcl/ast"
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"github.com/hashicorp/vault/helper/parseutil"
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"github.com/mitchellh/copystructure"
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)
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const (
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DenyCapability = "deny"
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CreateCapability = "create"
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ReadCapability = "read"
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UpdateCapability = "update"
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DeleteCapability = "delete"
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ListCapability = "list"
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SudoCapability = "sudo"
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RootCapability = "root"
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// Backwards compatibility
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OldDenyPathPolicy = "deny"
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OldReadPathPolicy = "read"
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OldWritePathPolicy = "write"
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OldSudoPathPolicy = "sudo"
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)
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const (
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DenyCapabilityInt uint32 = 1 << iota
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CreateCapabilityInt
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ReadCapabilityInt
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UpdateCapabilityInt
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DeleteCapabilityInt
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ListCapabilityInt
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SudoCapabilityInt
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)
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var (
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cap2Int = map[string]uint32{
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DenyCapability: DenyCapabilityInt,
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CreateCapability: CreateCapabilityInt,
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ReadCapability: ReadCapabilityInt,
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UpdateCapability: UpdateCapabilityInt,
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DeleteCapability: DeleteCapabilityInt,
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ListCapability: ListCapabilityInt,
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SudoCapability: SudoCapabilityInt,
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}
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)
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// Policy is used to represent the policy specified by
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// an ACL configuration.
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type Policy struct {
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Name string `hcl:"name"`
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Paths []*PathCapabilities `hcl:"-"`
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Raw string
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}
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// PathCapabilities represents a policy for a path in the namespace.
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type PathCapabilities struct {
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Prefix string
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Policy string
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Permissions *Permissions
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Glob bool
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Capabilities []string
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// These keys are used at the top level to make the HCL nicer; we store in
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// the Permissions object though
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MinWrappingTTLHCL interface{} `hcl:"min_wrapping_ttl"`
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MaxWrappingTTLHCL interface{} `hcl:"max_wrapping_ttl"`
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AllowedParametersHCL map[string][]interface{} `hcl:"allowed_parameters"`
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DeniedParametersHCL map[string][]interface{} `hcl:"denied_parameters"`
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}
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type Permissions struct {
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CapabilitiesBitmap uint32
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MinWrappingTTL time.Duration
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MaxWrappingTTL time.Duration
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AllowedParameters map[string][]interface{}
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DeniedParameters map[string][]interface{}
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}
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func (p *Permissions) Clone() (*Permissions, error) {
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ret := &Permissions{
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CapabilitiesBitmap: p.CapabilitiesBitmap,
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MinWrappingTTL: p.MinWrappingTTL,
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MaxWrappingTTL: p.MaxWrappingTTL,
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}
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switch {
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case p.AllowedParameters == nil:
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case len(p.AllowedParameters) == 0:
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ret.AllowedParameters = make(map[string][]interface{})
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default:
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clonedAllowed, err := copystructure.Copy(p.AllowedParameters)
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if err != nil {
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return nil, err
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}
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ret.AllowedParameters = clonedAllowed.(map[string][]interface{})
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}
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switch {
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case p.DeniedParameters == nil:
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case len(p.DeniedParameters) == 0:
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ret.DeniedParameters = make(map[string][]interface{})
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default:
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clonedDenied, err := copystructure.Copy(p.DeniedParameters)
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if err != nil {
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return nil, err
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}
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ret.DeniedParameters = clonedDenied.(map[string][]interface{})
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}
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return ret, nil
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}
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// Parse is used to parse the specified ACL rules into an
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// intermediary set of policies, before being compiled into
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// the ACL
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func Parse(rules string) (*Policy, error) {
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// Parse the rules
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root, err := hcl.Parse(rules)
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if err != nil {
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return nil, fmt.Errorf("Failed to parse policy: %s", err)
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}
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// Top-level item should be the object list
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list, ok := root.Node.(*ast.ObjectList)
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if !ok {
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return nil, fmt.Errorf("Failed to parse policy: does not contain a root object")
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}
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// Check for invalid top-level keys
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valid := []string{
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"name",
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"path",
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}
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if err := checkHCLKeys(list, valid); err != nil {
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return nil, fmt.Errorf("Failed to parse policy: %s", err)
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}
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// Create the initial policy and store the raw text of the rules
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var p Policy
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p.Raw = rules
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if err := hcl.DecodeObject(&p, list); err != nil {
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return nil, fmt.Errorf("Failed to parse policy: %s", err)
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}
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if o := list.Filter("path"); len(o.Items) > 0 {
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if err := parsePaths(&p, o); err != nil {
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return nil, fmt.Errorf("Failed to parse policy: %s", err)
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}
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}
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return &p, nil
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}
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func parsePaths(result *Policy, list *ast.ObjectList) error {
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paths := make([]*PathCapabilities, 0, len(list.Items))
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for _, item := range list.Items {
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key := "path"
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if len(item.Keys) > 0 {
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key = item.Keys[0].Token.Value().(string)
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}
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valid := []string{
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"policy",
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"capabilities",
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"allowed_parameters",
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"denied_parameters",
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"min_wrapping_ttl",
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"max_wrapping_ttl",
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}
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if err := checkHCLKeys(item.Val, valid); err != nil {
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return multierror.Prefix(err, fmt.Sprintf("path %q:", key))
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}
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var pc PathCapabilities
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// allocate memory so that DecodeObject can initialize the Permissions struct
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pc.Permissions = new(Permissions)
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pc.Prefix = key
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if err := hcl.DecodeObject(&pc, item.Val); err != nil {
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return multierror.Prefix(err, fmt.Sprintf("path %q:", key))
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}
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// Strip a leading '/' as paths in Vault start after the / in the API path
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if len(pc.Prefix) > 0 && pc.Prefix[0] == '/' {
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pc.Prefix = pc.Prefix[1:]
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}
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// Strip the glob character if found
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if strings.HasSuffix(pc.Prefix, "*") {
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pc.Prefix = strings.TrimSuffix(pc.Prefix, "*")
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pc.Glob = true
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}
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// Map old-style policies into capabilities
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if len(pc.Policy) > 0 {
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switch pc.Policy {
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case OldDenyPathPolicy:
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pc.Capabilities = []string{DenyCapability}
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case OldReadPathPolicy:
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pc.Capabilities = append(pc.Capabilities, []string{ReadCapability, ListCapability}...)
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case OldWritePathPolicy:
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pc.Capabilities = append(pc.Capabilities, []string{CreateCapability, ReadCapability, UpdateCapability, DeleteCapability, ListCapability}...)
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case OldSudoPathPolicy:
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pc.Capabilities = append(pc.Capabilities, []string{CreateCapability, ReadCapability, UpdateCapability, DeleteCapability, ListCapability, SudoCapability}...)
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default:
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return fmt.Errorf("path %q: invalid policy '%s'", key, pc.Policy)
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}
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}
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// Initialize the map
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pc.Permissions.CapabilitiesBitmap = 0
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for _, cap := range pc.Capabilities {
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switch cap {
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// If it's deny, don't include any other capability
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case DenyCapability:
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pc.Capabilities = []string{DenyCapability}
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pc.Permissions.CapabilitiesBitmap = DenyCapabilityInt
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goto PathFinished
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case CreateCapability, ReadCapability, UpdateCapability, DeleteCapability, ListCapability, SudoCapability:
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pc.Permissions.CapabilitiesBitmap |= cap2Int[cap]
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default:
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return fmt.Errorf("path %q: invalid capability '%s'", key, cap)
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}
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}
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if pc.AllowedParametersHCL != nil {
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pc.Permissions.AllowedParameters = make(map[string][]interface{}, len(pc.AllowedParametersHCL))
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for key, val := range pc.AllowedParametersHCL {
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pc.Permissions.AllowedParameters[strings.ToLower(key)] = val
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}
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}
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if pc.DeniedParametersHCL != nil {
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pc.Permissions.DeniedParameters = make(map[string][]interface{}, len(pc.DeniedParametersHCL))
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for key, val := range pc.DeniedParametersHCL {
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pc.Permissions.DeniedParameters[strings.ToLower(key)] = val
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}
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}
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if pc.MinWrappingTTLHCL != nil {
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dur, err := parseutil.ParseDurationSecond(pc.MinWrappingTTLHCL)
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if err != nil {
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return errwrap.Wrapf("error parsing min_wrapping_ttl: {{err}}", err)
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}
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pc.Permissions.MinWrappingTTL = dur
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}
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if pc.MaxWrappingTTLHCL != nil {
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dur, err := parseutil.ParseDurationSecond(pc.MaxWrappingTTLHCL)
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if err != nil {
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return errwrap.Wrapf("error parsing max_wrapping_ttl: {{err}}", err)
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}
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pc.Permissions.MaxWrappingTTL = dur
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}
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if pc.Permissions.MinWrappingTTL != 0 &&
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pc.Permissions.MaxWrappingTTL != 0 &&
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pc.Permissions.MaxWrappingTTL < pc.Permissions.MinWrappingTTL {
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return errors.New("max_wrapping_ttl cannot be less than min_wrapping_ttl")
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}
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PathFinished:
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paths = append(paths, &pc)
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}
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result.Paths = paths
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return nil
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}
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func checkHCLKeys(node ast.Node, valid []string) error {
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var list *ast.ObjectList
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switch n := node.(type) {
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case *ast.ObjectList:
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list = n
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case *ast.ObjectType:
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list = n.List
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default:
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return fmt.Errorf("cannot check HCL keys of type %T", n)
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}
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validMap := make(map[string]struct{}, len(valid))
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for _, v := range valid {
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validMap[v] = struct{}{}
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}
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var result error
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for _, item := range list.Items {
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key := item.Keys[0].Token.Value().(string)
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if _, ok := validMap[key]; !ok {
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result = multierror.Append(result, fmt.Errorf(
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"invalid key '%s' on line %d", key, item.Assign.Line))
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}
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}
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return result
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}
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