577 lines
16 KiB
Go
577 lines
16 KiB
Go
package acl
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"strconv"
|
|
"strings"
|
|
|
|
"github.com/hashicorp/hcl"
|
|
"github.com/hashicorp/hcl/hcl/ast"
|
|
hclprinter "github.com/hashicorp/hcl/hcl/printer"
|
|
"github.com/hashicorp/hcl/hcl/token"
|
|
)
|
|
|
|
type SyntaxVersion int
|
|
|
|
const (
|
|
SyntaxCurrent SyntaxVersion = iota
|
|
SyntaxLegacy
|
|
)
|
|
|
|
const (
|
|
PolicyDeny = "deny"
|
|
PolicyRead = "read"
|
|
PolicyList = "list"
|
|
PolicyWrite = "write"
|
|
)
|
|
|
|
type AccessLevel int
|
|
|
|
const (
|
|
AccessUnknown AccessLevel = iota
|
|
AccessDeny
|
|
AccessRead
|
|
AccessList
|
|
AccessWrite
|
|
)
|
|
|
|
func (l AccessLevel) String() string {
|
|
switch l {
|
|
case AccessDeny:
|
|
return PolicyDeny
|
|
case AccessRead:
|
|
return PolicyRead
|
|
case AccessList:
|
|
return PolicyList
|
|
case AccessWrite:
|
|
return PolicyWrite
|
|
default:
|
|
return "unknown"
|
|
}
|
|
}
|
|
|
|
func AccessLevelFromString(level string) (AccessLevel, error) {
|
|
switch strings.ToLower(level) {
|
|
case PolicyDeny:
|
|
return AccessDeny, nil
|
|
case PolicyRead:
|
|
return AccessRead, nil
|
|
case PolicyList:
|
|
return AccessList, nil
|
|
case PolicyWrite:
|
|
return AccessWrite, nil
|
|
default:
|
|
return AccessUnknown, fmt.Errorf("%q is not a valid access level", level)
|
|
}
|
|
}
|
|
|
|
type PolicyRules struct {
|
|
ACL string `hcl:"acl,expand"`
|
|
Agents []*AgentRule `hcl:"agent,expand"`
|
|
AgentPrefixes []*AgentRule `hcl:"agent_prefix,expand"`
|
|
Keys []*KeyRule `hcl:"key,expand"`
|
|
KeyPrefixes []*KeyRule `hcl:"key_prefix,expand"`
|
|
Nodes []*NodeRule `hcl:"node,expand"`
|
|
NodePrefixes []*NodeRule `hcl:"node_prefix,expand"`
|
|
Services []*ServiceRule `hcl:"service,expand"`
|
|
ServicePrefixes []*ServiceRule `hcl:"service_prefix,expand"`
|
|
Sessions []*SessionRule `hcl:"session,expand"`
|
|
SessionPrefixes []*SessionRule `hcl:"session_prefix,expand"`
|
|
Events []*EventRule `hcl:"event,expand"`
|
|
EventPrefixes []*EventRule `hcl:"event_prefix,expand"`
|
|
PreparedQueries []*PreparedQueryRule `hcl:"query,expand"`
|
|
PreparedQueryPrefixes []*PreparedQueryRule `hcl:"query_prefix,expand"`
|
|
Keyring string `hcl:"keyring"`
|
|
Operator string `hcl:"operator"`
|
|
}
|
|
|
|
// Policy is used to represent the policy specified by an ACL configuration.
|
|
type Policy struct {
|
|
ID string `hcl:"id"`
|
|
Revision uint64 `hcl:"revision"`
|
|
PolicyRules `hcl:",squash"`
|
|
EnterprisePolicyRules `hcl:",squash"`
|
|
}
|
|
|
|
// AgentRule represents a rule for working with agent endpoints on nodes
|
|
// with specific name prefixes.
|
|
type AgentRule struct {
|
|
Node string `hcl:",key"`
|
|
Policy string
|
|
}
|
|
|
|
// KeyRule represents a rule for a key
|
|
type KeyRule struct {
|
|
Prefix string `hcl:",key"`
|
|
Policy string
|
|
|
|
EnterpriseRule `hcl:",squash"`
|
|
}
|
|
|
|
// NodeRule represents a rule for a node
|
|
type NodeRule struct {
|
|
Name string `hcl:",key"`
|
|
Policy string
|
|
|
|
EnterpriseRule `hcl:",squash"`
|
|
}
|
|
|
|
// ServiceRule represents a policy for a service
|
|
type ServiceRule struct {
|
|
Name string `hcl:",key"`
|
|
Policy string
|
|
|
|
// Intentions is the policy for intentions where this service is the
|
|
// destination. This may be empty, in which case the Policy determines
|
|
// the intentions policy.
|
|
Intentions string
|
|
|
|
EnterpriseRule `hcl:",squash"`
|
|
}
|
|
|
|
// SessionRule represents a rule for making sessions tied to specific node
|
|
// name prefixes.
|
|
type SessionRule struct {
|
|
Node string `hcl:",key"`
|
|
Policy string
|
|
}
|
|
|
|
// EventRule represents a user event rule.
|
|
type EventRule struct {
|
|
Event string `hcl:",key"`
|
|
Policy string
|
|
}
|
|
|
|
// PreparedQueryRule represents a prepared query rule.
|
|
type PreparedQueryRule struct {
|
|
Prefix string `hcl:",key"`
|
|
Policy string
|
|
}
|
|
|
|
// isPolicyValid makes sure the given string matches one of the valid policies.
|
|
func isPolicyValid(policy string, allowList bool) bool {
|
|
access, err := AccessLevelFromString(policy)
|
|
if err != nil {
|
|
return false
|
|
}
|
|
if access == AccessList && !allowList {
|
|
return false
|
|
}
|
|
return true
|
|
}
|
|
|
|
func (pr *PolicyRules) Validate(conf *Config) error {
|
|
// Validate the acl policy - this one is allowed to be empty
|
|
if pr.ACL != "" && !isPolicyValid(pr.ACL, false) {
|
|
return fmt.Errorf("Invalid acl policy: %#v", pr.ACL)
|
|
}
|
|
|
|
// Validate the agent policy
|
|
for _, ap := range pr.Agents {
|
|
if !isPolicyValid(ap.Policy, false) {
|
|
return fmt.Errorf("Invalid agent policy: %#v", ap)
|
|
}
|
|
}
|
|
for _, ap := range pr.AgentPrefixes {
|
|
if !isPolicyValid(ap.Policy, false) {
|
|
return fmt.Errorf("Invalid agent_prefix policy: %#v", ap)
|
|
}
|
|
}
|
|
|
|
// Validate the key policy
|
|
for _, kp := range pr.Keys {
|
|
if !isPolicyValid(kp.Policy, true) {
|
|
return fmt.Errorf("Invalid key policy: %#v", kp)
|
|
}
|
|
if err := kp.EnterpriseRule.Validate(kp.Policy, conf); err != nil {
|
|
return fmt.Errorf("Invalid key enterprise policy: %#v, got error: %v", kp, err)
|
|
}
|
|
}
|
|
for _, kp := range pr.KeyPrefixes {
|
|
if !isPolicyValid(kp.Policy, true) {
|
|
return fmt.Errorf("Invalid key_prefix policy: %#v", kp)
|
|
}
|
|
if err := kp.EnterpriseRule.Validate(kp.Policy, conf); err != nil {
|
|
return fmt.Errorf("Invalid key_prefix enterprise policy: %#v, got error: %v", kp, err)
|
|
}
|
|
}
|
|
|
|
// Validate the node policies
|
|
for _, np := range pr.Nodes {
|
|
if !isPolicyValid(np.Policy, false) {
|
|
return fmt.Errorf("Invalid node policy: %#v", np)
|
|
}
|
|
if err := np.EnterpriseRule.Validate(np.Policy, conf); err != nil {
|
|
return fmt.Errorf("Invalid node enterprise policy: %#v, got error: %v", np, err)
|
|
}
|
|
}
|
|
for _, np := range pr.NodePrefixes {
|
|
if !isPolicyValid(np.Policy, false) {
|
|
return fmt.Errorf("Invalid node_prefix policy: %#v", np)
|
|
}
|
|
if err := np.EnterpriseRule.Validate(np.Policy, conf); err != nil {
|
|
return fmt.Errorf("Invalid node_prefix enterprise policy: %#v, got error: %v", np, err)
|
|
}
|
|
}
|
|
|
|
// Validate the service policies
|
|
for _, sp := range pr.Services {
|
|
if !isPolicyValid(sp.Policy, false) {
|
|
return fmt.Errorf("Invalid service policy: %#v", sp)
|
|
}
|
|
if sp.Intentions != "" && !isPolicyValid(sp.Intentions, false) {
|
|
return fmt.Errorf("Invalid service intentions policy: %#v", sp)
|
|
}
|
|
if err := sp.EnterpriseRule.Validate(sp.Policy, conf); err != nil {
|
|
return fmt.Errorf("Invalid service enterprise policy: %#v, got error: %v", sp, err)
|
|
}
|
|
}
|
|
for _, sp := range pr.ServicePrefixes {
|
|
if !isPolicyValid(sp.Policy, false) {
|
|
return fmt.Errorf("Invalid service_prefix policy: %#v", sp)
|
|
}
|
|
if sp.Intentions != "" && !isPolicyValid(sp.Intentions, false) {
|
|
return fmt.Errorf("Invalid service_prefix intentions policy: %#v", sp)
|
|
}
|
|
if err := sp.EnterpriseRule.Validate(sp.Policy, conf); err != nil {
|
|
return fmt.Errorf("Invalid service_prefix enterprise policy: %#v, got error: %v", sp, err)
|
|
}
|
|
}
|
|
|
|
// Validate the session policies
|
|
for _, sp := range pr.Sessions {
|
|
if !isPolicyValid(sp.Policy, false) {
|
|
return fmt.Errorf("Invalid session policy: %#v", sp)
|
|
}
|
|
}
|
|
for _, sp := range pr.SessionPrefixes {
|
|
if !isPolicyValid(sp.Policy, false) {
|
|
return fmt.Errorf("Invalid session_prefix policy: %#v", sp)
|
|
}
|
|
}
|
|
|
|
// Validate the user event policies
|
|
for _, ep := range pr.Events {
|
|
if !isPolicyValid(ep.Policy, false) {
|
|
return fmt.Errorf("Invalid event policy: %#v", ep)
|
|
}
|
|
}
|
|
for _, ep := range pr.EventPrefixes {
|
|
if !isPolicyValid(ep.Policy, false) {
|
|
return fmt.Errorf("Invalid event_prefix policy: %#v", ep)
|
|
}
|
|
}
|
|
|
|
// Validate the prepared query policies
|
|
for _, pq := range pr.PreparedQueries {
|
|
if !isPolicyValid(pq.Policy, false) {
|
|
return fmt.Errorf("Invalid query policy: %#v", pq)
|
|
}
|
|
}
|
|
for _, pq := range pr.PreparedQueryPrefixes {
|
|
if !isPolicyValid(pq.Policy, false) {
|
|
return fmt.Errorf("Invalid query_prefix policy: %#v", pq)
|
|
}
|
|
}
|
|
|
|
// Validate the keyring policy - this one is allowed to be empty
|
|
if pr.Keyring != "" && !isPolicyValid(pr.Keyring, false) {
|
|
return fmt.Errorf("Invalid keyring policy: %#v", pr.Keyring)
|
|
}
|
|
|
|
// Validate the operator policy - this one is allowed to be empty
|
|
if pr.Operator != "" && !isPolicyValid(pr.Operator, false) {
|
|
return fmt.Errorf("Invalid operator policy: %#v", pr.Operator)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func parseCurrent(rules string, conf *Config, meta *EnterprisePolicyMeta) (*Policy, error) {
|
|
p, err := decodeRules(rules, conf, meta)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if err := p.PolicyRules.Validate(conf); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if err := p.EnterprisePolicyRules.Validate(conf); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return p, nil
|
|
}
|
|
|
|
func parseLegacy(rules string, conf *Config) (*Policy, error) {
|
|
p := &Policy{}
|
|
|
|
type LegacyPolicy struct {
|
|
Agents []*AgentRule `hcl:"agent,expand"`
|
|
Keys []*KeyRule `hcl:"key,expand"`
|
|
Nodes []*NodeRule `hcl:"node,expand"`
|
|
Services []*ServiceRule `hcl:"service,expand"`
|
|
Sessions []*SessionRule `hcl:"session,expand"`
|
|
Events []*EventRule `hcl:"event,expand"`
|
|
PreparedQueries []*PreparedQueryRule `hcl:"query,expand"`
|
|
Keyring string `hcl:"keyring"`
|
|
Operator string `hcl:"operator"`
|
|
}
|
|
|
|
lp := &LegacyPolicy{}
|
|
|
|
if err := hcl.Decode(lp, rules); err != nil {
|
|
return nil, fmt.Errorf("Failed to parse ACL rules: %v", err)
|
|
}
|
|
|
|
// Validate the agent policy
|
|
for _, ap := range lp.Agents {
|
|
if !isPolicyValid(ap.Policy, false) {
|
|
return nil, fmt.Errorf("Invalid agent policy: %#v", ap)
|
|
}
|
|
|
|
p.AgentPrefixes = append(p.AgentPrefixes, ap)
|
|
}
|
|
|
|
// Validate the key policy
|
|
for _, kp := range lp.Keys {
|
|
if !isPolicyValid(kp.Policy, true) {
|
|
return nil, fmt.Errorf("Invalid key policy: %#v", kp)
|
|
}
|
|
|
|
if err := kp.EnterpriseRule.Validate(kp.Policy, conf); err != nil {
|
|
return nil, fmt.Errorf("Invalid key enterprise policy: %#v, got error: %v", kp, err)
|
|
}
|
|
|
|
p.KeyPrefixes = append(p.KeyPrefixes, kp)
|
|
}
|
|
|
|
// Validate the node policies
|
|
for _, np := range lp.Nodes {
|
|
if !isPolicyValid(np.Policy, false) {
|
|
return nil, fmt.Errorf("Invalid node policy: %#v", np)
|
|
}
|
|
if err := np.EnterpriseRule.Validate(np.Policy, conf); err != nil {
|
|
return nil, fmt.Errorf("Invalid node enterprise policy: %#v, got error: %v", np, err)
|
|
}
|
|
|
|
p.NodePrefixes = append(p.NodePrefixes, np)
|
|
}
|
|
|
|
// Validate the service policies
|
|
for _, sp := range lp.Services {
|
|
if !isPolicyValid(sp.Policy, false) {
|
|
return nil, fmt.Errorf("Invalid service policy: %#v", sp)
|
|
}
|
|
if sp.Intentions != "" && !isPolicyValid(sp.Intentions, false) {
|
|
return nil, fmt.Errorf("Invalid service intentions policy: %#v", sp)
|
|
}
|
|
if err := sp.EnterpriseRule.Validate(sp.Policy, conf); err != nil {
|
|
return nil, fmt.Errorf("Invalid service enterprise policy: %#v, got error: %v", sp, err)
|
|
}
|
|
|
|
p.ServicePrefixes = append(p.ServicePrefixes, sp)
|
|
}
|
|
|
|
// Validate the session policies
|
|
for _, sp := range lp.Sessions {
|
|
if !isPolicyValid(sp.Policy, false) {
|
|
return nil, fmt.Errorf("Invalid session policy: %#v", sp)
|
|
}
|
|
|
|
p.SessionPrefixes = append(p.SessionPrefixes, sp)
|
|
}
|
|
|
|
// Validate the user event policies
|
|
for _, ep := range lp.Events {
|
|
if !isPolicyValid(ep.Policy, false) {
|
|
return nil, fmt.Errorf("Invalid event policy: %#v", ep)
|
|
}
|
|
|
|
p.EventPrefixes = append(p.EventPrefixes, ep)
|
|
}
|
|
|
|
// Validate the prepared query policies
|
|
for _, pq := range lp.PreparedQueries {
|
|
if !isPolicyValid(pq.Policy, false) {
|
|
return nil, fmt.Errorf("Invalid query policy: %#v", pq)
|
|
}
|
|
|
|
p.PreparedQueryPrefixes = append(p.PreparedQueryPrefixes, pq)
|
|
}
|
|
|
|
// Validate the keyring policy - this one is allowed to be empty
|
|
if lp.Keyring != "" && !isPolicyValid(lp.Keyring, false) {
|
|
return nil, fmt.Errorf("Invalid keyring policy: %#v", lp.Keyring)
|
|
} else {
|
|
p.Keyring = lp.Keyring
|
|
}
|
|
|
|
// Validate the operator policy - this one is allowed to be empty
|
|
if lp.Operator != "" && !isPolicyValid(lp.Operator, false) {
|
|
return nil, fmt.Errorf("Invalid operator policy: %#v", lp.Operator)
|
|
} else {
|
|
p.Operator = lp.Operator
|
|
}
|
|
|
|
return p, nil
|
|
}
|
|
|
|
// NewPolicyFromSource is used to parse the specified ACL rules into an
|
|
// intermediary set of policies, before being compiled into
|
|
// the ACL
|
|
func NewPolicyFromSource(id string, revision uint64, rules string, syntax SyntaxVersion, conf *Config, meta *EnterprisePolicyMeta) (*Policy, error) {
|
|
if rules == "" {
|
|
// Hot path for empty source
|
|
return &Policy{ID: id, Revision: revision}, nil
|
|
}
|
|
|
|
var policy *Policy
|
|
var err error
|
|
switch syntax {
|
|
case SyntaxLegacy:
|
|
policy, err = parseLegacy(rules, conf)
|
|
case SyntaxCurrent:
|
|
policy, err = parseCurrent(rules, conf, meta)
|
|
default:
|
|
return nil, fmt.Errorf("Invalid rules version: %d", syntax)
|
|
}
|
|
|
|
if err == nil {
|
|
policy.ID = id
|
|
policy.Revision = revision
|
|
}
|
|
return policy, err
|
|
}
|
|
|
|
func (policy *Policy) ConvertToLegacy() *Policy {
|
|
converted := &Policy{
|
|
ID: policy.ID,
|
|
Revision: policy.Revision,
|
|
PolicyRules: PolicyRules{
|
|
ACL: policy.ACL,
|
|
Keyring: policy.Keyring,
|
|
Operator: policy.Operator,
|
|
},
|
|
}
|
|
|
|
converted.Agents = append(converted.Agents, policy.Agents...)
|
|
converted.Agents = append(converted.Agents, policy.AgentPrefixes...)
|
|
converted.Keys = append(converted.Keys, policy.Keys...)
|
|
converted.Keys = append(converted.Keys, policy.KeyPrefixes...)
|
|
converted.Nodes = append(converted.Nodes, policy.Nodes...)
|
|
converted.Nodes = append(converted.Nodes, policy.NodePrefixes...)
|
|
converted.Services = append(converted.Services, policy.Services...)
|
|
converted.Services = append(converted.Services, policy.ServicePrefixes...)
|
|
converted.Sessions = append(converted.Sessions, policy.Sessions...)
|
|
converted.Sessions = append(converted.Sessions, policy.SessionPrefixes...)
|
|
converted.Events = append(converted.Events, policy.Events...)
|
|
converted.Events = append(converted.Events, policy.EventPrefixes...)
|
|
converted.PreparedQueries = append(converted.PreparedQueries, policy.PreparedQueries...)
|
|
converted.PreparedQueries = append(converted.PreparedQueries, policy.PreparedQueryPrefixes...)
|
|
return converted
|
|
}
|
|
|
|
func (policy *Policy) ConvertFromLegacy() *Policy {
|
|
return &Policy{
|
|
ID: policy.ID,
|
|
Revision: policy.Revision,
|
|
PolicyRules: PolicyRules{
|
|
AgentPrefixes: policy.Agents,
|
|
KeyPrefixes: policy.Keys,
|
|
NodePrefixes: policy.Nodes,
|
|
ServicePrefixes: policy.Services,
|
|
SessionPrefixes: policy.Sessions,
|
|
EventPrefixes: policy.Events,
|
|
PreparedQueryPrefixes: policy.PreparedQueries,
|
|
Keyring: policy.Keyring,
|
|
Operator: policy.Operator,
|
|
},
|
|
}
|
|
}
|
|
|
|
// takesPrecedenceOver returns true when permission a
|
|
// should take precedence over permission b
|
|
func takesPrecedenceOver(a, b string) bool {
|
|
if a == PolicyDeny {
|
|
return true
|
|
} else if b == PolicyDeny {
|
|
return false
|
|
}
|
|
|
|
if a == PolicyWrite {
|
|
return true
|
|
} else if b == PolicyWrite {
|
|
return false
|
|
}
|
|
|
|
if a == PolicyList {
|
|
return true
|
|
} else if b == PolicyList {
|
|
return false
|
|
}
|
|
|
|
if a == PolicyRead {
|
|
return true
|
|
} else if b == PolicyRead {
|
|
return false
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
func TranslateLegacyRules(policyBytes []byte) ([]byte, error) {
|
|
parsed, err := hcl.ParseBytes(policyBytes)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("Failed to parse rules: %v", err)
|
|
}
|
|
|
|
rewritten := ast.Walk(parsed, func(node ast.Node) (ast.Node, bool) {
|
|
switch n := node.(type) {
|
|
case *ast.ObjectItem:
|
|
if len(n.Keys) < 1 {
|
|
return node, true
|
|
}
|
|
|
|
txt := n.Keys[0].Token.Text
|
|
if n.Keys[0].Token.Type == token.STRING {
|
|
txt, err = strconv.Unquote(txt)
|
|
if err != nil {
|
|
return node, true
|
|
}
|
|
}
|
|
|
|
switch txt {
|
|
case "policy":
|
|
n.Keys[0].Token.Text = "policy"
|
|
case "agent":
|
|
n.Keys[0].Token.Text = "agent_prefix"
|
|
case "key":
|
|
n.Keys[0].Token.Text = "key_prefix"
|
|
case "node":
|
|
n.Keys[0].Token.Text = "node_prefix"
|
|
case "query":
|
|
n.Keys[0].Token.Text = "query_prefix"
|
|
case "service":
|
|
n.Keys[0].Token.Text = "service_prefix"
|
|
case "session":
|
|
n.Keys[0].Token.Text = "session_prefix"
|
|
case "event":
|
|
n.Keys[0].Token.Text = "event_prefix"
|
|
}
|
|
}
|
|
|
|
return node, true
|
|
})
|
|
|
|
buffer := new(bytes.Buffer)
|
|
|
|
if err := hclprinter.Fprint(buffer, rewritten); err != nil {
|
|
return nil, fmt.Errorf("Failed to output new rules: %v", err)
|
|
}
|
|
|
|
return buffer.Bytes(), nil
|
|
}
|