540 lines
16 KiB
Go
540 lines
16 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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multierror "github.com/hashicorp/go-multierror"
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"github.com/hashicorp/go-secure-stdlib/parseutil"
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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/identity"
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"github.com/hashicorp/vault/helper/namespace"
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"github.com/hashicorp/vault/sdk/helper/hclutil"
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"github.com/hashicorp/vault/sdk/helper/identitytpl"
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"github.com/hashicorp/vault/sdk/logical"
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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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PatchCapability = "patch"
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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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PatchCapabilityInt
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)
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// Error constants for testing
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const (
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// ControlledCapabilityPolicySubsetError is thrown when a control group's controlled capabilities
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// are not a subset of the policy's capabilities.
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ControlledCapabilityPolicySubsetError = "control group factor capabilities must be a subset of the policy's capabilities"
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)
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type PolicyType uint32
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const (
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PolicyTypeACL PolicyType = iota
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PolicyTypeRGP
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PolicyTypeEGP
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// Triggers a lookup in the map to figure out if ACL or RGP
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PolicyTypeToken
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)
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func (p PolicyType) String() string {
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switch p {
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case PolicyTypeACL:
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return "acl"
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case PolicyTypeRGP:
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return "rgp"
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case PolicyTypeEGP:
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return "egp"
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}
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return ""
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}
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var 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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PatchCapability: PatchCapabilityInt,
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}
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type egpPath struct {
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Path string `json:"path"`
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Glob bool `json:"glob"`
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}
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// Policy is used to represent the policy specified by an ACL configuration.
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type Policy struct {
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sentinelPolicy
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Name string `hcl:"name"`
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Paths []*PathRules `hcl:"-"`
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Raw string
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Type PolicyType
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Templated bool
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namespace *namespace.Namespace
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}
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// ShallowClone returns a shallow clone of the policy. This should not be used
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// if any of the reference-typed fields are going to be modified
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func (p *Policy) ShallowClone() *Policy {
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return &Policy{
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sentinelPolicy: p.sentinelPolicy,
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Name: p.Name,
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Paths: p.Paths,
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Raw: p.Raw,
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Type: p.Type,
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Templated: p.Templated,
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namespace: p.namespace,
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}
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}
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// PathRules represents a policy for a path in the namespace.
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type PathRules struct {
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Path string
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Policy string
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Permissions *ACLPermissions
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IsPrefix bool
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HasSegmentWildcards 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 ACLPermissions 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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RequiredParametersHCL []string `hcl:"required_parameters"`
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MFAMethodsHCL []string `hcl:"mfa_methods"`
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ControlGroupHCL *ControlGroupHCL `hcl:"control_group"`
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}
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type ControlGroupHCL struct {
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TTL interface{} `hcl:"ttl"`
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Factors map[string]*ControlGroupFactor `hcl:"factor"`
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}
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type ControlGroup struct {
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TTL time.Duration
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Factors []*ControlGroupFactor
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}
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type ControlGroupFactor struct {
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Name string
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Identity *IdentityFactor `hcl:"identity"`
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ControlledCapabilities []string `hcl:"controlled_capabilities"`
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}
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type IdentityFactor struct {
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GroupIDs []string `hcl:"group_ids"`
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GroupNames []string `hcl:"group_names"`
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ApprovalsRequired int `hcl:"approvals"`
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}
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type ACLPermissions 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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RequiredParameters []string
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MFAMethods []string
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ControlGroup *ControlGroup
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GrantingPoliciesMap map[uint32][]logical.PolicyInfo
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}
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func (p *ACLPermissions) Clone() (*ACLPermissions, error) {
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ret := &ACLPermissions{
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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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RequiredParameters: p.RequiredParameters[:],
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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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switch {
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case p.MFAMethods == nil:
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case len(p.MFAMethods) == 0:
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ret.MFAMethods = []string{}
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default:
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clonedMFAMethods, err := copystructure.Copy(p.MFAMethods)
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if err != nil {
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return nil, err
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}
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ret.MFAMethods = clonedMFAMethods.([]string)
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}
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switch {
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case p.ControlGroup == nil:
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default:
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clonedControlGroup, err := copystructure.Copy(p.ControlGroup)
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if err != nil {
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return nil, err
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}
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ret.ControlGroup = clonedControlGroup.(*ControlGroup)
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}
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switch {
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case p.GrantingPoliciesMap == nil:
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case len(p.GrantingPoliciesMap) == 0:
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ret.GrantingPoliciesMap = make(map[uint32][]logical.PolicyInfo)
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default:
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clonedGrantingPoliciesMap, err := copystructure.Copy(p.GrantingPoliciesMap)
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if err != nil {
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return nil, err
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}
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ret.GrantingPoliciesMap = clonedGrantingPoliciesMap.(map[uint32][]logical.PolicyInfo)
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}
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return ret, nil
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}
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func addGrantingPoliciesToMap(m map[uint32][]logical.PolicyInfo, policy *Policy, capabilitiesBitmap uint32) map[uint32][]logical.PolicyInfo {
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if m == nil {
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m = make(map[uint32][]logical.PolicyInfo)
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}
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// For all possible policies, check if the provided capabilities include
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// them
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for _, capability := range cap2Int {
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if capabilitiesBitmap&capability == 0 {
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continue
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}
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m[capability] = append(m[capability], logical.PolicyInfo{
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Name: policy.Name,
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NamespaceId: policy.namespace.ID,
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Type: "acl",
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})
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}
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return m
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}
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// ParseACLPolicy 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 ParseACLPolicy(ns *namespace.Namespace, rules string) (*Policy, error) {
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return parseACLPolicyWithTemplating(ns, rules, false, nil, nil)
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}
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// parseACLPolicyWithTemplating performs the actual work and checks whether we
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// should perform substitutions. If performTemplating is true we know that it
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// is templated so we don't check again, otherwise we check to see if it's a
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// templated policy.
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func parseACLPolicyWithTemplating(ns *namespace.Namespace, rules string, performTemplating bool, entity *identity.Entity, groups []*identity.Group) (*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: %w", 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 := hclutil.CheckHCLKeys(list, valid); err != nil {
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return nil, fmt.Errorf("failed to parse policy: %w", 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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p := Policy{
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Raw: rules,
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Type: PolicyTypeACL,
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namespace: ns,
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}
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if err := hcl.DecodeObject(&p, list); err != nil {
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return nil, fmt.Errorf("failed to parse policy: %w", 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, performTemplating, entity, groups); err != nil {
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return nil, fmt.Errorf("failed to parse policy: %w", 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, performTemplating bool, entity *identity.Entity, groups []*identity.Group) error {
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paths := make([]*PathRules, 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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// Check the path
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if performTemplating {
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_, templated, err := identitytpl.PopulateString(identitytpl.PopulateStringInput{
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Mode: identitytpl.ACLTemplating,
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String: key,
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Entity: identity.ToSDKEntity(entity),
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Groups: identity.ToSDKGroups(groups),
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NamespaceID: result.namespace.ID,
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})
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if err != nil {
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continue
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}
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key = templated
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} else {
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hasTemplating, _, err := identitytpl.PopulateString(identitytpl.PopulateStringInput{
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Mode: identitytpl.ACLTemplating,
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ValidityCheckOnly: true,
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String: key,
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})
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if err != nil {
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return fmt.Errorf("failed to validate policy templating: %w", err)
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}
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if hasTemplating {
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result.Templated = true
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}
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}
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valid := []string{
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"comment",
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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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"required_parameters",
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"min_wrapping_ttl",
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"max_wrapping_ttl",
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"mfa_methods",
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"control_group",
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}
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if err := hclutil.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 PathRules
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// allocate memory so that DecodeObject can initialize the ACLPermissions struct
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pc.Permissions = new(ACLPermissions)
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pc.Path = 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.Path) > 0 && pc.Path[0] == '/' {
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pc.Path = pc.Path[1:]
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}
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// Ensure we are using the full request path internally
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pc.Path = result.namespace.Path + pc.Path
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if strings.Contains(pc.Path, "+*") {
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return fmt.Errorf("path %q: invalid use of wildcards ('+*' is forbidden)", pc.Path)
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}
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if pc.Path == "+" || strings.Count(pc.Path, "/+") > 0 || strings.HasPrefix(pc.Path, "+/") {
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pc.HasSegmentWildcards = true
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}
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if strings.HasSuffix(pc.Path, "*") {
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// If there are segment wildcards, don't actually strip the
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// trailing asterisk, but don't want to hit the default case
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if !pc.HasSegmentWildcards {
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// Strip the glob character if found
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pc.Path = strings.TrimSuffix(pc.Path, "*")
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pc.IsPrefix = true
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}
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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 %q", 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, PatchCapability:
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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 %q", 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 fmt.Errorf("error parsing min_wrapping_ttl: %w", 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 fmt.Errorf("error parsing max_wrapping_ttl: %w", err)
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}
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pc.Permissions.MaxWrappingTTL = dur
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}
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if pc.MFAMethodsHCL != nil {
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pc.Permissions.MFAMethods = make([]string, len(pc.MFAMethodsHCL))
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for idx, item := range pc.MFAMethodsHCL {
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pc.Permissions.MFAMethods[idx] = item
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}
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}
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if pc.ControlGroupHCL != nil {
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pc.Permissions.ControlGroup = new(ControlGroup)
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if pc.ControlGroupHCL.TTL != nil {
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dur, err := parseutil.ParseDurationSecond(pc.ControlGroupHCL.TTL)
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if err != nil {
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return fmt.Errorf("error parsing control group max ttl: %w", err)
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}
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pc.Permissions.ControlGroup.TTL = dur
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}
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var factors []*ControlGroupFactor
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if pc.ControlGroupHCL.Factors != nil {
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for key, factor := range pc.ControlGroupHCL.Factors {
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// Although we only have one factor here, we need to check to make sure there is at least
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// one factor defined in this factor block.
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if factor.Identity == nil {
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return errors.New("no control_group factor provided")
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}
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if factor.Identity.ApprovalsRequired <= 0 ||
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(len(factor.Identity.GroupIDs) == 0 && len(factor.Identity.GroupNames) == 0) {
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return errors.New("must provide more than one identity group and approvals > 0")
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}
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// Ensure that configured ControlledCapabilities for factor are a subset of the
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// Capabilities of the policy.
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if len(factor.ControlledCapabilities) > 0 {
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var found bool
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for _, controlledCapability := range factor.ControlledCapabilities {
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found = false
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for _, policyCap := range pc.Capabilities {
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if controlledCapability == policyCap {
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found = true
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}
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}
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if !found {
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return errors.New(ControlledCapabilityPolicySubsetError)
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}
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}
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}
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factors = append(factors, &ControlGroupFactor{
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Name: key,
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Identity: factor.Identity,
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ControlledCapabilities: factor.ControlledCapabilities,
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})
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}
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}
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if len(factors) == 0 {
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return errors.New("no control group factors provided")
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}
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pc.Permissions.ControlGroup.Factors = factors
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}
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if pc.Permissions.MinWrappingTTL != 0 &&
|
|
pc.Permissions.MaxWrappingTTL != 0 &&
|
|
pc.Permissions.MaxWrappingTTL < pc.Permissions.MinWrappingTTL {
|
|
return errors.New("max_wrapping_ttl cannot be less than min_wrapping_ttl")
|
|
}
|
|
if len(pc.RequiredParametersHCL) > 0 {
|
|
pc.Permissions.RequiredParameters = pc.RequiredParametersHCL[:]
|
|
}
|
|
|
|
PathFinished:
|
|
paths = append(paths, &pc)
|
|
}
|
|
|
|
result.Paths = paths
|
|
return nil
|
|
}
|