policy-engine/iam/converter_native.go

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package iam
import (
"errors"
"fmt"
"strings"
"git.frostfs.info/TrueCloudLab/policy-engine/pkg/chain"
"git.frostfs.info/TrueCloudLab/policy-engine/schema/native"
)
const PropertyKeyFilePath = "FilePath"
var actionToNativeOpMap = map[string][]string{
s3ActionAbortMultipartUpload: {native.MethodGetContainer, native.MethodDeleteObject, native.MethodHeadObject, native.MethodGetObject, native.MethodPutObject},
s3ActionCreateBucket: {native.MethodGetContainer, native.MethodPutContainer, native.MethodSetContainerEACL, native.MethodGetObject, native.MethodPutObject},
s3ActionDeleteBucket: {native.MethodGetContainer, native.MethodDeleteContainer, native.MethodSearchObject, native.MethodHeadObject, native.MethodGetObject},
s3ActionDeleteBucketPolicy: {native.MethodGetContainer},
s3ActionDeleteObject: {native.MethodGetContainer, native.MethodDeleteObject, native.MethodPutObject, native.MethodHeadObject, native.MethodGetObject, native.MethodRangeObject},
s3ActionDeleteObjectTagging: {native.MethodGetContainer, native.MethodHeadObject, native.MethodGetObject, native.MethodPutObject},
s3ActionDeleteObjectVersion: {native.MethodGetContainer, native.MethodDeleteObject, native.MethodPutObject, native.MethodHeadObject, native.MethodGetObject, native.MethodRangeObject},
s3ActionDeleteObjectVersionTagging: {native.MethodGetContainer, native.MethodHeadObject, native.MethodGetObject, native.MethodPutObject},
s3ActionGetBucketACL: {native.MethodGetContainer, native.MethodGetContainerEACL, native.MethodGetObject},
s3ActionGetBucketCORS: {native.MethodGetContainer, native.MethodGetObject, native.MethodHeadObject},
s3ActionGetBucketLocation: {native.MethodGetContainer},
s3ActionGetBucketNotification: {native.MethodGetContainer, native.MethodGetObject, native.MethodHeadObject},
s3ActionGetBucketObjectLockConfiguration: {native.MethodGetContainer, native.MethodGetObject},
s3ActionGetBucketPolicy: {native.MethodGetContainer},
s3ActionGetBucketPolicyStatus: {native.MethodGetContainer},
s3ActionGetBucketTagging: {native.MethodGetContainer, native.MethodGetObject},
s3ActionGetBucketVersioning: {native.MethodGetContainer, native.MethodGetObject},
s3ActionGetLifecycleConfiguration: { /*not implemented yet*/ },
s3ActionGetObject: {native.MethodGetContainer, native.MethodGetObject, native.MethodHeadObject, native.MethodSearchObject, native.MethodRangeObject, native.MethodHashObject},
s3ActionGetObjectACL: {native.MethodGetContainer, native.MethodGetContainerEACL, native.MethodGetObject, native.MethodHeadObject},
s3ActionGetObjectAttributes: {native.MethodGetContainer, native.MethodGetObject, native.MethodHeadObject},
s3ActionGetObjectLegalHold: {native.MethodGetContainer, native.MethodHeadObject, native.MethodGetObject},
s3ActionGetObjectRetention: {native.MethodGetContainer, native.MethodHeadObject, native.MethodGetObject},
s3ActionGetObjectTagging: {native.MethodGetContainer, native.MethodHeadObject, native.MethodGetObject},
s3ActionGetObjectVersion: {native.MethodGetContainer, native.MethodGetObject, native.MethodHeadObject, native.MethodSearchObject, native.MethodRangeObject, native.MethodHashObject},
s3ActionGetObjectVersionACL: {native.MethodGetContainer, native.MethodGetContainerEACL, native.MethodGetObject, native.MethodHeadObject},
s3ActionGetObjectVersionAttributes: {native.MethodGetContainer, native.MethodGetObject, native.MethodHeadObject},
s3ActionGetObjectVersionTagging: {native.MethodGetContainer, native.MethodHeadObject, native.MethodGetObject},
s3ActionListAllMyBuckets: {native.MethodListContainers, native.MethodGetContainer},
s3ActionListBucket: {native.MethodGetContainer, native.MethodGetObject, native.MethodHeadObject, native.MethodSearchObject, native.MethodRangeObject, native.MethodHashObject},
s3ActionListBucketMultipartUploads: {native.MethodGetContainer, native.MethodGetObject},
s3ActionListBucketVersions: {native.MethodGetContainer, native.MethodGetObject, native.MethodHeadObject, native.MethodSearchObject, native.MethodRangeObject, native.MethodHashObject},
s3ActionListMultipartUploadParts: {native.MethodGetContainer, native.MethodGetObject},
s3ActionPutBucketACL: {native.MethodGetContainer, native.MethodSetContainerEACL, native.MethodGetObject, native.MethodPutObject},
s3ActionPutBucketCORS: {native.MethodGetContainer, native.MethodGetObject, native.MethodPutObject},
s3ActionPutBucketNotification: {native.MethodGetContainer, native.MethodHeadObject, native.MethodDeleteObject, native.MethodGetObject, native.MethodPutObject},
s3ActionPutBucketObjectLockConfiguration: {native.MethodGetContainer, native.MethodGetObject, native.MethodPutObject},
s3ActionPutBucketPolicy: {native.MethodGetContainer},
s3ActionPutBucketTagging: {native.MethodGetContainer, native.MethodGetObject, native.MethodPutObject},
s3ActionPutBucketVersioning: {native.MethodGetContainer, native.MethodGetObject, native.MethodPutObject},
s3ActionPutLifecycleConfiguration: { /*not implemented yet*/ },
s3ActionPutObject: {native.MethodGetContainer, native.MethodPutObject, native.MethodGetObject, native.MethodHeadObject, native.MethodRangeObject},
s3ActionPutObjectACL: {native.MethodGetContainer, native.MethodGetContainerEACL, native.MethodSetContainerEACL, native.MethodGetObject, native.MethodHeadObject},
s3ActionPutObjectLegalHold: {native.MethodGetContainer, native.MethodHeadObject, native.MethodGetObject, native.MethodPutObject},
s3ActionPutObjectRetention: {native.MethodGetContainer, native.MethodHeadObject, native.MethodGetObject, native.MethodPutObject},
s3ActionPutObjectTagging: {native.MethodGetContainer, native.MethodHeadObject, native.MethodGetObject, native.MethodPutObject},
s3ActionPutObjectVersionACL: {native.MethodGetContainer, native.MethodGetContainerEACL, native.MethodSetContainerEACL, native.MethodGetObject, native.MethodHeadObject},
s3ActionPutObjectVersionTagging: {native.MethodGetContainer, native.MethodHeadObject, native.MethodGetObject, native.MethodPutObject},
}
var containerNativeOperations = map[string]struct{}{
native.MethodPutContainer: {},
native.MethodDeleteContainer: {},
native.MethodGetContainer: {},
native.MethodListContainers: {},
native.MethodSetContainerEACL: {},
native.MethodGetContainerEACL: {},
}
var objectNativeOperations = map[string]struct{}{
native.MethodGetObject: {},
native.MethodPutObject: {},
native.MethodHeadObject: {},
native.MethodDeleteObject: {},
native.MethodSearchObject: {},
native.MethodRangeObject: {},
native.MethodHashObject: {},
}
var errConditionKeyNotApplicable = errors.New("condition key is not applicable")
type NativeResolver interface {
GetUserKey(account, name string) (string, error)
GetBucketInfo(bucket string) (*BucketInfo, error)
}
type BucketInfo struct {
Namespace string
Container string
}
func ConvertToNativeChain(p Policy, resolver NativeResolver) (*chain.Chain, error) {
if err := p.Validate(ResourceBasedPolicyType); err != nil {
return nil, err
}
var engineChain chain.Chain
for _, statement := range p.Statement {
status := formStatus(statement)
if status != chain.Allow {
// Most s3 methods share the same native operations. Deny rules must not affect shared native operations,
// therefore this code skips all deny rules for native protocol. Deny is applied for s3 protocol only, in this case.
continue
}
action, actionInverted := statement.action()
nativeActions, err := formNativeActionNames(action)
if err != nil {
return nil, err
}
ruleAction := chain.Actions{Inverted: actionInverted, Names: nativeActions}
if len(ruleAction.Names) == 0 {
continue
}
resource, resourceInverted := statement.resource()
groupedResources, err := formNativeResourceNamesAndConditions(resource, resolver, getActionTypes(nativeActions))
if err != nil {
return nil, err
}
groupedConditions, err := convertToNativeChainCondition(statement.Conditions, resolver)
if err != nil {
if errors.Is(err, errConditionKeyNotApplicable) {
continue
}
return nil, err
}
splitConditions := splitGroupedConditions(groupedConditions)
principals, principalCondFn, err := getNativePrincipalsAndConditionFunc(statement, resolver)
if err != nil {
return nil, err
}
for _, groupedResource := range groupedResources {
for _, principal := range principals {
for _, conditions := range splitConditions {
var principalCondition []chain.Condition
if principal != Wildcard {
principalCondition = []chain.Condition{principalCondFn(principal)}
}
ruleConditions := append(principalCondition, groupedResource.Conditions...)
r := chain.Rule{
Status: status,
Actions: ruleAction,
Resources: chain.Resources{
Inverted: resourceInverted,
Names: groupedResource.Names,
},
Condition: append(ruleConditions, conditions...),
}
engineChain.Rules = append(engineChain.Rules, r)
}
}
}
}
if len(engineChain.Rules) == 0 {
return nil, ErrActionsNotApplicable
}
return &engineChain, nil
}
func getActionTypes(nativeActions []string) ActionTypes {
var res ActionTypes
for _, action := range nativeActions {
if res.Object && res.Container {
break
}
_, isObj := objectNativeOperations[action]
_, isCnr := containerNativeOperations[action]
res.Object = res.Object || isObj || action == Wildcard
res.Container = res.Container || isCnr || action == Wildcard
}
return res
}
func getNativePrincipalsAndConditionFunc(statement Statement, resolver NativeResolver) ([]string, formPrincipalConditionFunc, error) {
var principals []string
var op chain.ConditionType
statementPrincipal, inverted := statement.principal()
if _, ok := statementPrincipal[Wildcard]; ok { // this can be true only if 'inverted' false
principals = []string{Wildcard}
op = chain.CondStringLike
} else {
for principalType, principal := range statementPrincipal {
if principalType != AWSPrincipalType {
return nil, nil, fmt.Errorf("unsupported principal type '%s'", principalType)
}
parsedPrincipal, err := formNativePrincipal(principal, resolver)
if err != nil {
return nil, nil, fmt.Errorf("parse principal: %w", err)
}
principals = append(principals, parsedPrincipal...)
}
op = chain.CondStringEquals
if inverted {
op = chain.CondStringNotEquals
}
}
return principals, func(principal string) chain.Condition {
return chain.Condition{
Op: op,
Kind: chain.KindRequest,
Key: native.PropertyKeyActorPublicKey,
Value: principal,
}
}, nil
}
func convertToNativeChainCondition(c Conditions, resolver NativeResolver) ([]GroupedConditions, error) {
return convertToChainConditions(c, func(gr GroupedConditions) (GroupedConditions, error) {
for i := range gr.Conditions {
if gr.Conditions[i].Key == condKeyAWSMFAPresent {
return GroupedConditions{}, errConditionKeyNotApplicable
}
if gr.Conditions[i].Key == condKeyAWSPrincipalARN {
gr.Conditions[i].Key = native.PropertyKeyActorPublicKey
val, err := formPrincipalKey(gr.Conditions[i].Value, resolver)
if err != nil {
return GroupedConditions{}, err
}
gr.Conditions[i].Value = val
}
}
return gr, nil
})
}
type GroupedResources struct {
Names []string
Conditions []chain.Condition
}
type ActionTypes struct {
Object bool
Container bool
}
func formNativeResourceNamesAndConditions(names []string, resolver NativeResolver, actionTypes ActionTypes) ([]GroupedResources, error) {
if !actionTypes.Object && !actionTypes.Container {
return nil, ErrActionsNotApplicable
}
res := make([]GroupedResources, 0, len(names))
combined := make(map[string]struct{})
for _, resource := range names {
if err := validateResource(resource); err != nil {
return nil, err
}
if resource == Wildcard {
res = res[:0]
return append(res, formWildcardNativeResource(actionTypes)), nil
}
if !strings.HasPrefix(resource, s3ResourcePrefix) {
continue
}
var bkt, obj string
s3Resource := strings.TrimPrefix(resource, s3ResourcePrefix)
if s3Resource == Wildcard {
res = res[:0]
return append(res, formWildcardNativeResource(actionTypes)), nil
}
if sepIndex := strings.Index(s3Resource, "/"); sepIndex < 0 {
bkt = s3Resource
} else {
bkt = s3Resource[:sepIndex]
obj = s3Resource[sepIndex+1:]
if len(obj) == 0 {
obj = Wildcard
}
}
bktInfo, err := resolver.GetBucketInfo(bkt)
if err != nil {
return nil, err
}
if obj == Wildcard && actionTypes.Object { // this corresponds to arn:aws:s3:::BUCKET/ or arn:aws:s3:::BUCKET/*
combined[fmt.Sprintf(native.ResourceFormatNamespaceContainerObjects, bktInfo.Namespace, bktInfo.Container)] = struct{}{}
combined[fmt.Sprintf(native.ResourceFormatNamespaceContainer, bktInfo.Namespace, bktInfo.Container)] = struct{}{}
continue
}
if obj == "" && actionTypes.Container { // this corresponds to arn:aws:s3:::BUCKET
combined[fmt.Sprintf(native.ResourceFormatNamespaceContainer, bktInfo.Namespace, bktInfo.Container)] = struct{}{}
continue
}
res = append(res, GroupedResources{
Names: []string{
fmt.Sprintf(native.ResourceFormatNamespaceContainerObjects, bktInfo.Namespace, bktInfo.Container),
fmt.Sprintf(native.ResourceFormatNamespaceContainer, bktInfo.Namespace, bktInfo.Container),
},
Conditions: []chain.Condition{
{
Op: chain.CondStringLike,
Kind: chain.KindResource,
Key: PropertyKeyFilePath,
Value: obj,
},
},
})
}
if len(combined) != 0 {
gr := GroupedResources{Names: make([]string, 0, len(combined))}
for key := range combined {
gr.Names = append(gr.Names, key)
}
res = append(res, gr)
}
return res, nil
}
func formWildcardNativeResource(actionTypes ActionTypes) GroupedResources {
groupedNames := make([]string, 0, 2)
if actionTypes.Object {
groupedNames = append(groupedNames, native.ResourceFormatAllObjects)
}
if actionTypes.Container {
groupedNames = append(groupedNames, native.ResourceFormatAllContainers)
}
return GroupedResources{Names: groupedNames}
}
func formNativePrincipal(principal []string, resolver NativeResolver) ([]string, error) {
res := make([]string, len(principal))
var err error
for i := range principal {
if res[i], err = formPrincipalKey(principal[i], resolver); err != nil {
return nil, err
}
}
return res, nil
}
func formPrincipalKey(principal string, resolver NativeResolver) (string, error) {
account, user, err := parsePrincipalAsIAMUser(principal)
if err != nil {
return "", err
}
key, err := resolver.GetUserKey(account, user)
if err != nil {
return "", fmt.Errorf("get user key: %w", err)
}
return key, nil
}
func formNativeActionNames(names []string) ([]string, error) {
uniqueActions := make(map[string]struct{}, len(names))
for _, action := range names {
if action == Wildcard {
return []string{Wildcard}, nil
}
isIAM, err := validateAction(action)
if err != nil {
return nil, err
}
if isIAM {
continue
}
if action[len(s3ActionPrefix):] == Wildcard {
return []string{Wildcard}, nil
}
nativeActions := actionToNativeOpMap[action]
if len(nativeActions) == 0 {
return nil, ErrActionsNotApplicable
}
for _, nativeAction := range nativeActions {
uniqueActions[nativeAction] = struct{}{}
}
}
res := make([]string, 0, len(uniqueActions))
for key := range uniqueActions {
res = append(res, key)
}
return res, nil
}