c683315b67
We added support a bit ago for some read operations to take in parameters, so we should now apply these checks against them.
452 lines
12 KiB
Go
452 lines
12 KiB
Go
package vault
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import (
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"context"
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"fmt"
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"reflect"
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"strings"
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"github.com/armon/go-radix"
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"github.com/hashicorp/errwrap"
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multierror "github.com/hashicorp/go-multierror"
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"github.com/hashicorp/vault/helper/identity"
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"github.com/hashicorp/vault/helper/strutil"
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"github.com/hashicorp/vault/logical"
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)
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// ACL is used to wrap a set of policies to provide
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// an efficient interface for access control.
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type ACL struct {
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// exactRules contains the path policies that are exact
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exactRules *radix.Tree
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// globRules contains the path policies that glob
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globRules *radix.Tree
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// root is enabled if the "root" named policy is present.
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root bool
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}
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type PolicyCheckOpts struct {
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RootPrivsRequired bool
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Unauth bool
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}
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type AuthResults struct {
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ACLResults *ACLResults
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Allowed bool
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RootPrivs bool
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Error *multierror.Error
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}
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type ACLResults struct {
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Allowed bool
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RootPrivs bool
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IsRoot bool
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MFAMethods []string
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}
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// New is used to construct a policy based ACL from a set of policies.
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func NewACL(policies []*Policy) (*ACL, error) {
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// Initialize
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a := &ACL{
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exactRules: radix.New(),
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globRules: radix.New(),
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root: false,
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}
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// Inject each policy
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for _, policy := range policies {
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// Ignore a nil policy object
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if policy == nil {
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continue
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}
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switch policy.Type {
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case PolicyTypeACL:
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default:
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return nil, fmt.Errorf("unable to parse policy (wrong type)")
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}
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// Check if this is root
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if policy.Name == "root" {
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a.root = true
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}
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for _, pc := range policy.Paths {
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// Check which tree to use
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tree := a.exactRules
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if pc.Glob {
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tree = a.globRules
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}
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// Check for an existing policy
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raw, ok := tree.Get(pc.Prefix)
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if !ok {
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clonedPerms, err := pc.Permissions.Clone()
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if err != nil {
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return nil, errwrap.Wrapf("error cloning ACL permissions: {{err}}", err)
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}
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tree.Insert(pc.Prefix, clonedPerms)
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continue
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}
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// these are the ones already in the tree
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existingPerms := raw.(*ACLPermissions)
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switch {
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case existingPerms.CapabilitiesBitmap&DenyCapabilityInt > 0:
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// If we are explicitly denied in the existing capability set,
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// don't save anything else
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continue
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case pc.Permissions.CapabilitiesBitmap&DenyCapabilityInt > 0:
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// If this new policy explicitly denies, only save the deny value
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existingPerms.CapabilitiesBitmap = DenyCapabilityInt
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existingPerms.AllowedParameters = nil
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existingPerms.DeniedParameters = nil
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goto INSERT
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default:
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// Insert the capabilities in this new policy into the existing
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// value
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existingPerms.CapabilitiesBitmap = existingPerms.CapabilitiesBitmap | pc.Permissions.CapabilitiesBitmap
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}
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// Note: In these stanzas, we're preferring minimum lifetimes. So
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// we take the lesser of two specified max values, or we take the
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// lesser of two specified min values, the idea being, allowing
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// token lifetime to be minimum possible.
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//
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// If we have an existing max, and we either don't have a current
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// max, or the current is greater than the previous, use the
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// existing.
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if pc.Permissions.MaxWrappingTTL > 0 &&
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(existingPerms.MaxWrappingTTL == 0 ||
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pc.Permissions.MaxWrappingTTL < existingPerms.MaxWrappingTTL) {
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existingPerms.MaxWrappingTTL = pc.Permissions.MaxWrappingTTL
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}
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// If we have an existing min, and we either don't have a current
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// min, or the current is greater than the previous, use the
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// existing
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if pc.Permissions.MinWrappingTTL > 0 &&
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(existingPerms.MinWrappingTTL == 0 ||
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pc.Permissions.MinWrappingTTL < existingPerms.MinWrappingTTL) {
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existingPerms.MinWrappingTTL = pc.Permissions.MinWrappingTTL
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}
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if len(pc.Permissions.AllowedParameters) > 0 {
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if existingPerms.AllowedParameters == nil {
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existingPerms.AllowedParameters = pc.Permissions.AllowedParameters
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} else {
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for key, value := range pc.Permissions.AllowedParameters {
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pcValue, ok := existingPerms.AllowedParameters[key]
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// If an empty array exist it should overwrite any other
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// value.
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if len(value) == 0 || (ok && len(pcValue) == 0) {
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existingPerms.AllowedParameters[key] = []interface{}{}
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} else {
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// Merge the two maps, appending values on key conflict.
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existingPerms.AllowedParameters[key] = append(value, existingPerms.AllowedParameters[key]...)
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}
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}
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}
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}
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if len(pc.Permissions.DeniedParameters) > 0 {
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if existingPerms.DeniedParameters == nil {
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existingPerms.DeniedParameters = pc.Permissions.DeniedParameters
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} else {
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for key, value := range pc.Permissions.DeniedParameters {
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pcValue, ok := existingPerms.DeniedParameters[key]
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// If an empty array exist it should overwrite any other
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// value.
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if len(value) == 0 || (ok && len(pcValue) == 0) {
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existingPerms.DeniedParameters[key] = []interface{}{}
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} else {
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// Merge the two maps, appending values on key conflict.
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existingPerms.DeniedParameters[key] = append(value, existingPerms.DeniedParameters[key]...)
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}
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}
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}
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}
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if len(pc.Permissions.RequiredParameters) > 0 {
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if len(existingPerms.RequiredParameters) == 0 {
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existingPerms.RequiredParameters = pc.Permissions.RequiredParameters
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} else {
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for _, v := range pc.Permissions.RequiredParameters {
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if !strutil.StrListContains(existingPerms.RequiredParameters, v) {
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existingPerms.RequiredParameters = append(existingPerms.RequiredParameters, v)
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}
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}
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}
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}
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INSERT:
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tree.Insert(pc.Prefix, existingPerms)
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}
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}
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return a, nil
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}
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func (a *ACL) Capabilities(path string) (pathCapabilities []string) {
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// Fast-path root
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if a.root {
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return []string{RootCapability}
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}
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// Find an exact matching rule, look for glob if no match
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var capabilities uint32
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raw, ok := a.exactRules.Get(path)
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if ok {
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perm := raw.(*ACLPermissions)
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capabilities = perm.CapabilitiesBitmap
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goto CHECK
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}
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// Find a glob rule, default deny if no match
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_, raw, ok = a.globRules.LongestPrefix(path)
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if !ok {
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return []string{DenyCapability}
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} else {
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perm := raw.(*ACLPermissions)
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capabilities = perm.CapabilitiesBitmap
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}
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CHECK:
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if capabilities&SudoCapabilityInt > 0 {
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pathCapabilities = append(pathCapabilities, SudoCapability)
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}
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if capabilities&ReadCapabilityInt > 0 {
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pathCapabilities = append(pathCapabilities, ReadCapability)
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}
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if capabilities&ListCapabilityInt > 0 {
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pathCapabilities = append(pathCapabilities, ListCapability)
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}
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if capabilities&UpdateCapabilityInt > 0 {
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pathCapabilities = append(pathCapabilities, UpdateCapability)
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}
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if capabilities&DeleteCapabilityInt > 0 {
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pathCapabilities = append(pathCapabilities, DeleteCapability)
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}
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if capabilities&CreateCapabilityInt > 0 {
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pathCapabilities = append(pathCapabilities, CreateCapability)
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}
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// If "deny" is explicitly set or if the path has no capabilities at all,
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// set the path capabilities to "deny"
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if capabilities&DenyCapabilityInt > 0 || len(pathCapabilities) == 0 {
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pathCapabilities = []string{DenyCapability}
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}
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return
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}
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// AllowOperation is used to check if the given operation is permitted.
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func (a *ACL) AllowOperation(req *logical.Request) (ret *ACLResults) {
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ret = new(ACLResults)
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// Fast-path root
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if a.root {
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ret.Allowed = true
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ret.RootPrivs = true
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ret.IsRoot = true
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return
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}
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op := req.Operation
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path := req.Path
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// Help is always allowed
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if op == logical.HelpOperation {
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ret.Allowed = true
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return
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}
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var permissions *ACLPermissions
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// Find an exact matching rule, look for glob if no match
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var capabilities uint32
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raw, ok := a.exactRules.Get(path)
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if ok {
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permissions = raw.(*ACLPermissions)
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capabilities = permissions.CapabilitiesBitmap
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goto CHECK
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}
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// Find a glob rule, default deny if no match
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_, raw, ok = a.globRules.LongestPrefix(path)
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if !ok {
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return
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} else {
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permissions = raw.(*ACLPermissions)
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capabilities = permissions.CapabilitiesBitmap
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}
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CHECK:
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// Check if the minimum permissions are met
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// If "deny" has been explicitly set, only deny will be in the map, so we
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// only need to check for the existence of other values
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ret.RootPrivs = capabilities&SudoCapabilityInt > 0
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operationAllowed := false
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switch op {
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case logical.ReadOperation:
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operationAllowed = capabilities&ReadCapabilityInt > 0
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case logical.ListOperation:
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operationAllowed = capabilities&ListCapabilityInt > 0
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case logical.UpdateOperation:
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operationAllowed = capabilities&UpdateCapabilityInt > 0
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case logical.DeleteOperation:
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operationAllowed = capabilities&DeleteCapabilityInt > 0
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case logical.CreateOperation:
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operationAllowed = capabilities&CreateCapabilityInt > 0
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// These three re-use UpdateCapabilityInt since that's the most appropriate
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// capability/operation mapping
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case logical.RevokeOperation, logical.RenewOperation, logical.RollbackOperation:
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operationAllowed = capabilities&UpdateCapabilityInt > 0
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default:
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return
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}
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if !operationAllowed {
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return
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}
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if permissions.MaxWrappingTTL > 0 {
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if req.WrapInfo == nil || req.WrapInfo.TTL > permissions.MaxWrappingTTL {
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return
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}
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}
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if permissions.MinWrappingTTL > 0 {
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if req.WrapInfo == nil || req.WrapInfo.TTL < permissions.MinWrappingTTL {
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return
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}
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}
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// This situation can happen because of merging, even though in a single
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// path statement we check on ingress
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if permissions.MinWrappingTTL != 0 &&
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permissions.MaxWrappingTTL != 0 &&
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permissions.MaxWrappingTTL < permissions.MinWrappingTTL {
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return
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}
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// Only check parameter permissions for operations that can modify
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// parameters.
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if op == logical.ReadOperation || op == logical.UpdateOperation || op == logical.CreateOperation {
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for _, parameter := range permissions.RequiredParameters {
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if _, ok := req.Data[strings.ToLower(parameter)]; !ok {
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return
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}
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}
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// If there are no data fields, allow
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if len(req.Data) == 0 {
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ret.Allowed = true
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return
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}
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if len(permissions.DeniedParameters) == 0 {
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goto ALLOWED_PARAMETERS
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}
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// Check if all parameters have been denied
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if _, ok := permissions.DeniedParameters["*"]; ok {
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return
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}
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for parameter, value := range req.Data {
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// Check if parameter has been explicitly denied
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if valueSlice, ok := permissions.DeniedParameters[strings.ToLower(parameter)]; ok {
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// If the value exists in denied values slice, deny
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if valueInParameterList(value, valueSlice) {
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return
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}
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}
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}
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ALLOWED_PARAMETERS:
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// If we don't have any allowed parameters set, allow
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if len(permissions.AllowedParameters) == 0 {
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ret.Allowed = true
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return
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}
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_, allowedAll := permissions.AllowedParameters["*"]
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if len(permissions.AllowedParameters) == 1 && allowedAll {
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ret.Allowed = true
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return
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}
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for parameter, value := range req.Data {
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valueSlice, ok := permissions.AllowedParameters[strings.ToLower(parameter)]
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// Requested parameter is not in allowed list
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if !ok && !allowedAll {
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return
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}
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// If the value doesn't exists in the allowed values slice,
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// deny
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if ok && !valueInParameterList(value, valueSlice) {
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return
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}
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}
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}
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ret.Allowed = true
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return
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}
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func (c *Core) performPolicyChecks(ctx context.Context, acl *ACL, te *TokenEntry, req *logical.Request, inEntity *identity.Entity, opts *PolicyCheckOpts) (ret *AuthResults) {
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ret = new(AuthResults)
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// First, perform normal ACL checks if requested. The only time no ACL
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// should be applied is if we are only processing EGPs against a login
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// path in which case opts.Unauth will be set.
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if acl != nil && !opts.Unauth {
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ret.ACLResults = acl.AllowOperation(req)
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ret.RootPrivs = ret.ACLResults.RootPrivs
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// Root is always allowed; skip Sentinel/MFA checks
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if ret.ACLResults.IsRoot {
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//c.logger.Warn("policy: token is root, skipping checks")
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ret.Allowed = true
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return
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}
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if !ret.ACLResults.Allowed {
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return
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}
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if !ret.RootPrivs && opts.RootPrivsRequired {
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return
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}
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}
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ret.Allowed = true
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return
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}
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func valueInParameterList(v interface{}, list []interface{}) bool {
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// Empty list is equivalent to the item always existing in the list
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if len(list) == 0 {
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return true
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}
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return valueInSlice(v, list)
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}
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func valueInSlice(v interface{}, list []interface{}) bool {
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for _, el := range list {
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if reflect.TypeOf(el).String() == "string" && reflect.TypeOf(v).String() == "string" {
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item := el.(string)
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val := v.(string)
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if strutil.GlobbedStringsMatch(item, val) {
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return true
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}
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} else if reflect.DeepEqual(el, v) {
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return true
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}
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}
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return false
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}
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