mirror of
https://github.com/minio/minio.git
synced 2025-11-09 05:34:56 -05:00
Bala FA
Harshavardhana
115
vendor/github.com/minio/minio-go/pkg/policy/bucket-policy-condition.go
generated
vendored
Normal file
115
vendor/github.com/minio/minio-go/pkg/policy/bucket-policy-condition.go
generated
vendored
Normal file
@@ -0,0 +1,115 @@
|
||||
/*
|
||||
* Minio Go Library for Amazon S3 Compatible Cloud Storage (C) 2015 Minio, Inc.
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
package policy
|
||||
|
||||
import "github.com/minio/minio-go/pkg/set"
|
||||
|
||||
// ConditionKeyMap - map of policy condition key and value.
|
||||
type ConditionKeyMap map[string]set.StringSet
|
||||
|
||||
// Add - adds key and value. The value is appended If key already exists.
|
||||
func (ckm ConditionKeyMap) Add(key string, value set.StringSet) {
|
||||
if v, ok := ckm[key]; ok {
|
||||
ckm[key] = v.Union(value)
|
||||
} else {
|
||||
ckm[key] = set.CopyStringSet(value)
|
||||
}
|
||||
}
|
||||
|
||||
// Remove - removes value of given key. If key has empty after removal, the key is also removed.
|
||||
func (ckm ConditionKeyMap) Remove(key string, value set.StringSet) {
|
||||
if v, ok := ckm[key]; ok {
|
||||
if value != nil {
|
||||
ckm[key] = v.Difference(value)
|
||||
}
|
||||
|
||||
if ckm[key].IsEmpty() {
|
||||
delete(ckm, key)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// RemoveKey - removes key and its value.
|
||||
func (ckm ConditionKeyMap) RemoveKey(key string) {
|
||||
if _, ok := ckm[key]; ok {
|
||||
delete(ckm, key)
|
||||
}
|
||||
}
|
||||
|
||||
// CopyConditionKeyMap - returns new copy of given ConditionKeyMap.
|
||||
func CopyConditionKeyMap(condKeyMap ConditionKeyMap) ConditionKeyMap {
|
||||
out := make(ConditionKeyMap)
|
||||
|
||||
for k, v := range condKeyMap {
|
||||
out[k] = set.CopyStringSet(v)
|
||||
}
|
||||
|
||||
return out
|
||||
}
|
||||
|
||||
// mergeConditionKeyMap - returns a new ConditionKeyMap which contains merged key/value of given two ConditionKeyMap.
|
||||
func mergeConditionKeyMap(condKeyMap1 ConditionKeyMap, condKeyMap2 ConditionKeyMap) ConditionKeyMap {
|
||||
out := CopyConditionKeyMap(condKeyMap1)
|
||||
|
||||
for k, v := range condKeyMap2 {
|
||||
if ev, ok := out[k]; ok {
|
||||
out[k] = ev.Union(v)
|
||||
} else {
|
||||
out[k] = set.CopyStringSet(v)
|
||||
}
|
||||
}
|
||||
|
||||
return out
|
||||
}
|
||||
|
||||
// ConditionMap - map of condition and conditional values.
|
||||
type ConditionMap map[string]ConditionKeyMap
|
||||
|
||||
// Add - adds condition key and condition value. The value is appended if key already exists.
|
||||
func (cond ConditionMap) Add(condKey string, condKeyMap ConditionKeyMap) {
|
||||
if v, ok := cond[condKey]; ok {
|
||||
cond[condKey] = mergeConditionKeyMap(v, condKeyMap)
|
||||
} else {
|
||||
cond[condKey] = CopyConditionKeyMap(condKeyMap)
|
||||
}
|
||||
}
|
||||
|
||||
// Remove - removes condition key and its value.
|
||||
func (cond ConditionMap) Remove(condKey string) {
|
||||
if _, ok := cond[condKey]; ok {
|
||||
delete(cond, condKey)
|
||||
}
|
||||
}
|
||||
|
||||
// mergeConditionMap - returns new ConditionMap which contains merged key/value of two ConditionMap.
|
||||
func mergeConditionMap(condMap1 ConditionMap, condMap2 ConditionMap) ConditionMap {
|
||||
out := make(ConditionMap)
|
||||
|
||||
for k, v := range condMap1 {
|
||||
out[k] = CopyConditionKeyMap(v)
|
||||
}
|
||||
|
||||
for k, v := range condMap2 {
|
||||
if ev, ok := out[k]; ok {
|
||||
out[k] = mergeConditionKeyMap(ev, v)
|
||||
} else {
|
||||
out[k] = CopyConditionKeyMap(v)
|
||||
}
|
||||
}
|
||||
|
||||
return out
|
||||
}
|
||||
608
vendor/github.com/minio/minio-go/pkg/policy/bucket-policy.go
generated
vendored
Normal file
608
vendor/github.com/minio/minio-go/pkg/policy/bucket-policy.go
generated
vendored
Normal file
@@ -0,0 +1,608 @@
|
||||
/*
|
||||
* Minio Go Library for Amazon S3 Compatible Cloud Storage (C) 2015 Minio, Inc.
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
package policy
|
||||
|
||||
import (
|
||||
"reflect"
|
||||
"strings"
|
||||
|
||||
"github.com/minio/minio-go/pkg/set"
|
||||
)
|
||||
|
||||
// BucketPolicy - Bucket level policy.
|
||||
type BucketPolicy string
|
||||
|
||||
// Different types of Policies currently supported for buckets.
|
||||
const (
|
||||
BucketPolicyNone BucketPolicy = "none"
|
||||
BucketPolicyReadOnly = "readonly"
|
||||
BucketPolicyReadWrite = "readwrite"
|
||||
BucketPolicyWriteOnly = "writeonly"
|
||||
)
|
||||
|
||||
// isValidBucketPolicy - Is provided policy value supported.
|
||||
func (p BucketPolicy) IsValidBucketPolicy() bool {
|
||||
switch p {
|
||||
case BucketPolicyNone, BucketPolicyReadOnly, BucketPolicyReadWrite, BucketPolicyWriteOnly:
|
||||
return true
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
// Resource prefix for all aws resources.
|
||||
const awsResourcePrefix = "arn:aws:s3:::"
|
||||
|
||||
// Common bucket actions for both read and write policies.
|
||||
var commonBucketActions = set.CreateStringSet("s3:GetBucketLocation")
|
||||
|
||||
// Read only bucket actions.
|
||||
var readOnlyBucketActions = set.CreateStringSet("s3:ListBucket")
|
||||
|
||||
// Write only bucket actions.
|
||||
var writeOnlyBucketActions = set.CreateStringSet("s3:ListBucketMultipartUploads")
|
||||
|
||||
// Read only object actions.
|
||||
var readOnlyObjectActions = set.CreateStringSet("s3:GetObject")
|
||||
|
||||
// Write only object actions.
|
||||
var writeOnlyObjectActions = set.CreateStringSet("s3:AbortMultipartUpload", "s3:DeleteObject", "s3:ListMultipartUploadParts", "s3:PutObject")
|
||||
|
||||
// Read and write object actions.
|
||||
var readWriteObjectActions = readOnlyObjectActions.Union(writeOnlyObjectActions)
|
||||
|
||||
// All valid bucket and object actions.
|
||||
var validActions = commonBucketActions.
|
||||
Union(readOnlyBucketActions).
|
||||
Union(writeOnlyBucketActions).
|
||||
Union(readOnlyObjectActions).
|
||||
Union(writeOnlyObjectActions)
|
||||
|
||||
var startsWithFunc = func(resource string, resourcePrefix string) bool {
|
||||
return strings.HasPrefix(resource, resourcePrefix)
|
||||
}
|
||||
|
||||
// User - canonical users list.
|
||||
type User struct {
|
||||
AWS set.StringSet `json:"AWS,omitempty"`
|
||||
CanonicalUser set.StringSet `json:"CanonicalUser,omitempty"`
|
||||
}
|
||||
|
||||
// Statement - minio policy statement
|
||||
type Statement struct {
|
||||
Actions set.StringSet `json:"Action"`
|
||||
Conditions ConditionMap `json:"Condition,omitempty"`
|
||||
Effect string
|
||||
Principal User `json:"Principal"`
|
||||
Resources set.StringSet `json:"Resource"`
|
||||
Sid string
|
||||
}
|
||||
|
||||
// BucketAccessPolicy - minio policy collection
|
||||
type BucketAccessPolicy struct {
|
||||
Version string // date in YYYY-MM-DD format
|
||||
Statements []Statement `json:"Statement"`
|
||||
}
|
||||
|
||||
// isValidStatement - returns whether given statement is valid to process for given bucket name.
|
||||
func isValidStatement(statement Statement, bucketName string) bool {
|
||||
if statement.Actions.Intersection(validActions).IsEmpty() {
|
||||
return false
|
||||
}
|
||||
|
||||
if statement.Effect != "Allow" {
|
||||
return false
|
||||
}
|
||||
|
||||
if statement.Principal.AWS == nil || !statement.Principal.AWS.Contains("*") {
|
||||
return false
|
||||
}
|
||||
|
||||
bucketResource := awsResourcePrefix + bucketName
|
||||
if statement.Resources.Contains(bucketResource) {
|
||||
return true
|
||||
}
|
||||
|
||||
if statement.Resources.FuncMatch(startsWithFunc, bucketResource+"/").IsEmpty() {
|
||||
return false
|
||||
}
|
||||
|
||||
return true
|
||||
}
|
||||
|
||||
// Returns new statements with bucket actions for given policy.
|
||||
func newBucketStatement(policy BucketPolicy, bucketName string, prefix string) (statements []Statement) {
|
||||
statements = []Statement{}
|
||||
if policy == BucketPolicyNone || bucketName == "" {
|
||||
return statements
|
||||
}
|
||||
|
||||
bucketResource := set.CreateStringSet(awsResourcePrefix + bucketName)
|
||||
|
||||
statement := Statement{
|
||||
Actions: commonBucketActions,
|
||||
Effect: "Allow",
|
||||
Principal: User{AWS: set.CreateStringSet("*")},
|
||||
Resources: bucketResource,
|
||||
Sid: "",
|
||||
}
|
||||
statements = append(statements, statement)
|
||||
|
||||
if policy == BucketPolicyReadOnly || policy == BucketPolicyReadWrite {
|
||||
statement = Statement{
|
||||
Actions: readOnlyBucketActions,
|
||||
Effect: "Allow",
|
||||
Principal: User{AWS: set.CreateStringSet("*")},
|
||||
Resources: bucketResource,
|
||||
Sid: "",
|
||||
}
|
||||
if prefix != "" {
|
||||
condKeyMap := make(ConditionKeyMap)
|
||||
condKeyMap.Add("s3:prefix", set.CreateStringSet(prefix))
|
||||
condMap := make(ConditionMap)
|
||||
condMap.Add("StringEquals", condKeyMap)
|
||||
statement.Conditions = condMap
|
||||
}
|
||||
statements = append(statements, statement)
|
||||
}
|
||||
|
||||
if policy == BucketPolicyWriteOnly || policy == BucketPolicyReadWrite {
|
||||
statement = Statement{
|
||||
Actions: writeOnlyBucketActions,
|
||||
Effect: "Allow",
|
||||
Principal: User{AWS: set.CreateStringSet("*")},
|
||||
Resources: bucketResource,
|
||||
Sid: "",
|
||||
}
|
||||
statements = append(statements, statement)
|
||||
}
|
||||
|
||||
return statements
|
||||
}
|
||||
|
||||
// Returns new statements contains object actions for given policy.
|
||||
func newObjectStatement(policy BucketPolicy, bucketName string, prefix string) (statements []Statement) {
|
||||
statements = []Statement{}
|
||||
if policy == BucketPolicyNone || bucketName == "" {
|
||||
return statements
|
||||
}
|
||||
|
||||
statement := Statement{
|
||||
Effect: "Allow",
|
||||
Principal: User{AWS: set.CreateStringSet("*")},
|
||||
Resources: set.CreateStringSet(awsResourcePrefix + bucketName + "/" + prefix + "*"),
|
||||
Sid: "",
|
||||
}
|
||||
|
||||
if policy == BucketPolicyReadOnly {
|
||||
statement.Actions = readOnlyObjectActions
|
||||
} else if policy == BucketPolicyWriteOnly {
|
||||
statement.Actions = writeOnlyObjectActions
|
||||
} else if policy == BucketPolicyReadWrite {
|
||||
statement.Actions = readWriteObjectActions
|
||||
}
|
||||
|
||||
statements = append(statements, statement)
|
||||
return statements
|
||||
}
|
||||
|
||||
// Returns new statements for given policy, bucket and prefix.
|
||||
func newStatements(policy BucketPolicy, bucketName string, prefix string) (statements []Statement) {
|
||||
statements = []Statement{}
|
||||
ns := newBucketStatement(policy, bucketName, prefix)
|
||||
statements = append(statements, ns...)
|
||||
|
||||
ns = newObjectStatement(policy, bucketName, prefix)
|
||||
statements = append(statements, ns...)
|
||||
|
||||
return statements
|
||||
}
|
||||
|
||||
// Returns whether given bucket statements are used by other than given prefix statements.
|
||||
func getInUsePolicy(statements []Statement, bucketName string, prefix string) (readOnlyInUse, writeOnlyInUse bool) {
|
||||
resourcePrefix := awsResourcePrefix + bucketName + "/"
|
||||
objectResource := awsResourcePrefix + bucketName + "/" + prefix + "*"
|
||||
|
||||
for _, s := range statements {
|
||||
if !s.Resources.Contains(objectResource) && !s.Resources.FuncMatch(startsWithFunc, resourcePrefix).IsEmpty() {
|
||||
if s.Actions.Intersection(readOnlyObjectActions).Equals(readOnlyObjectActions) {
|
||||
readOnlyInUse = true
|
||||
}
|
||||
|
||||
if s.Actions.Intersection(writeOnlyObjectActions).Equals(writeOnlyObjectActions) {
|
||||
writeOnlyInUse = true
|
||||
}
|
||||
}
|
||||
if readOnlyInUse && writeOnlyInUse {
|
||||
break
|
||||
}
|
||||
}
|
||||
|
||||
return readOnlyInUse, writeOnlyInUse
|
||||
}
|
||||
|
||||
// Removes object actions in given statement.
|
||||
func removeObjectActions(statement Statement, objectResource string) Statement {
|
||||
if statement.Conditions == nil {
|
||||
if len(statement.Resources) > 1 {
|
||||
statement.Resources.Remove(objectResource)
|
||||
} else {
|
||||
statement.Actions = statement.Actions.Difference(readOnlyObjectActions)
|
||||
statement.Actions = statement.Actions.Difference(writeOnlyObjectActions)
|
||||
}
|
||||
}
|
||||
|
||||
return statement
|
||||
}
|
||||
|
||||
// Removes bucket actions for given policy in given statement.
|
||||
func removeBucketActions(statement Statement, prefix string, bucketResource string, readOnlyInUse, writeOnlyInUse bool) Statement {
|
||||
removeReadOnly := func() {
|
||||
if !statement.Actions.Intersection(readOnlyBucketActions).Equals(readOnlyBucketActions) {
|
||||
return
|
||||
}
|
||||
|
||||
if statement.Conditions == nil {
|
||||
statement.Actions = statement.Actions.Difference(readOnlyBucketActions)
|
||||
return
|
||||
}
|
||||
|
||||
if prefix != "" {
|
||||
stringEqualsValue := statement.Conditions["StringEquals"]
|
||||
values := set.NewStringSet()
|
||||
if stringEqualsValue != nil {
|
||||
values = stringEqualsValue["s3:prefix"]
|
||||
if values == nil {
|
||||
values = set.NewStringSet()
|
||||
}
|
||||
}
|
||||
|
||||
values.Remove(prefix)
|
||||
|
||||
if stringEqualsValue != nil {
|
||||
if values.IsEmpty() {
|
||||
delete(stringEqualsValue, "s3:prefix")
|
||||
}
|
||||
if len(stringEqualsValue) == 0 {
|
||||
delete(statement.Conditions, "StringEquals")
|
||||
}
|
||||
}
|
||||
|
||||
if len(statement.Conditions) == 0 {
|
||||
statement.Conditions = nil
|
||||
statement.Actions = statement.Actions.Difference(readOnlyBucketActions)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
removeWriteOnly := func() {
|
||||
if statement.Conditions == nil {
|
||||
statement.Actions = statement.Actions.Difference(writeOnlyBucketActions)
|
||||
}
|
||||
}
|
||||
|
||||
if len(statement.Resources) > 1 {
|
||||
statement.Resources.Remove(bucketResource)
|
||||
} else {
|
||||
if !readOnlyInUse {
|
||||
removeReadOnly()
|
||||
}
|
||||
|
||||
if !writeOnlyInUse {
|
||||
removeWriteOnly()
|
||||
}
|
||||
}
|
||||
|
||||
return statement
|
||||
}
|
||||
|
||||
// Returns statements containing removed actions/statements for given
|
||||
// policy, bucket name and prefix.
|
||||
func removeStatements(statements []Statement, bucketName string, prefix string) []Statement {
|
||||
bucketResource := awsResourcePrefix + bucketName
|
||||
objectResource := awsResourcePrefix + bucketName + "/" + prefix + "*"
|
||||
readOnlyInUse, writeOnlyInUse := getInUsePolicy(statements, bucketName, prefix)
|
||||
|
||||
out := []Statement{}
|
||||
readOnlyBucketStatements := []Statement{}
|
||||
s3PrefixValues := set.NewStringSet()
|
||||
|
||||
for _, statement := range statements {
|
||||
if !isValidStatement(statement, bucketName) {
|
||||
out = append(out, statement)
|
||||
continue
|
||||
}
|
||||
|
||||
if statement.Resources.Contains(bucketResource) {
|
||||
if statement.Conditions != nil {
|
||||
statement = removeBucketActions(statement, prefix, bucketResource, false, false)
|
||||
} else {
|
||||
statement = removeBucketActions(statement, prefix, bucketResource, readOnlyInUse, writeOnlyInUse)
|
||||
}
|
||||
} else if statement.Resources.Contains(objectResource) {
|
||||
statement = removeObjectActions(statement, objectResource)
|
||||
}
|
||||
|
||||
if !statement.Actions.IsEmpty() {
|
||||
if statement.Resources.Contains(bucketResource) &&
|
||||
statement.Actions.Intersection(readOnlyBucketActions).Equals(readOnlyBucketActions) &&
|
||||
statement.Effect == "Allow" &&
|
||||
statement.Principal.AWS.Contains("*") {
|
||||
|
||||
if statement.Conditions != nil {
|
||||
stringEqualsValue := statement.Conditions["StringEquals"]
|
||||
values := set.NewStringSet()
|
||||
if stringEqualsValue != nil {
|
||||
values = stringEqualsValue["s3:prefix"]
|
||||
if values == nil {
|
||||
values = set.NewStringSet()
|
||||
}
|
||||
}
|
||||
s3PrefixValues = s3PrefixValues.Union(values.ApplyFunc(func(v string) string {
|
||||
return bucketResource + "/" + v + "*"
|
||||
}))
|
||||
} else if !s3PrefixValues.IsEmpty() {
|
||||
readOnlyBucketStatements = append(readOnlyBucketStatements, statement)
|
||||
continue
|
||||
}
|
||||
}
|
||||
out = append(out, statement)
|
||||
}
|
||||
}
|
||||
|
||||
skipBucketStatement := true
|
||||
resourcePrefix := awsResourcePrefix + bucketName + "/"
|
||||
for _, statement := range out {
|
||||
if !statement.Resources.FuncMatch(startsWithFunc, resourcePrefix).IsEmpty() &&
|
||||
s3PrefixValues.Intersection(statement.Resources).IsEmpty() {
|
||||
skipBucketStatement = false
|
||||
break
|
||||
}
|
||||
}
|
||||
|
||||
for _, statement := range readOnlyBucketStatements {
|
||||
if skipBucketStatement &&
|
||||
statement.Resources.Contains(bucketResource) &&
|
||||
statement.Effect == "Allow" &&
|
||||
statement.Principal.AWS.Contains("*") &&
|
||||
statement.Conditions == nil {
|
||||
continue
|
||||
}
|
||||
|
||||
out = append(out, statement)
|
||||
}
|
||||
|
||||
if len(out) == 1 {
|
||||
statement := out[0]
|
||||
if statement.Resources.Contains(bucketResource) &&
|
||||
statement.Actions.Intersection(commonBucketActions).Equals(commonBucketActions) &&
|
||||
statement.Effect == "Allow" &&
|
||||
statement.Principal.AWS.Contains("*") &&
|
||||
statement.Conditions == nil {
|
||||
out = []Statement{}
|
||||
}
|
||||
}
|
||||
|
||||
return out
|
||||
}
|
||||
|
||||
// Appends given statement into statement list to have unique statements.
|
||||
// - If statement already exists in statement list, it ignores.
|
||||
// - If statement exists with different conditions, they are merged.
|
||||
// - Else the statement is appended to statement list.
|
||||
func appendStatement(statements []Statement, statement Statement) []Statement {
|
||||
for i, s := range statements {
|
||||
if s.Actions.Equals(statement.Actions) &&
|
||||
s.Effect == statement.Effect &&
|
||||
s.Principal.AWS.Equals(statement.Principal.AWS) &&
|
||||
reflect.DeepEqual(s.Conditions, statement.Conditions) {
|
||||
statements[i].Resources = s.Resources.Union(statement.Resources)
|
||||
return statements
|
||||
} else if s.Resources.Equals(statement.Resources) &&
|
||||
s.Effect == statement.Effect &&
|
||||
s.Principal.AWS.Equals(statement.Principal.AWS) &&
|
||||
reflect.DeepEqual(s.Conditions, statement.Conditions) {
|
||||
statements[i].Actions = s.Actions.Union(statement.Actions)
|
||||
return statements
|
||||
}
|
||||
|
||||
if s.Resources.Intersection(statement.Resources).Equals(statement.Resources) &&
|
||||
s.Actions.Intersection(statement.Actions).Equals(statement.Actions) &&
|
||||
s.Effect == statement.Effect &&
|
||||
s.Principal.AWS.Intersection(statement.Principal.AWS).Equals(statement.Principal.AWS) {
|
||||
if reflect.DeepEqual(s.Conditions, statement.Conditions) {
|
||||
return statements
|
||||
}
|
||||
if s.Conditions != nil && statement.Conditions != nil {
|
||||
if s.Resources.Equals(statement.Resources) {
|
||||
statements[i].Conditions = mergeConditionMap(s.Conditions, statement.Conditions)
|
||||
return statements
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if !(statement.Actions.IsEmpty() && statement.Resources.IsEmpty()) {
|
||||
return append(statements, statement)
|
||||
}
|
||||
|
||||
return statements
|
||||
}
|
||||
|
||||
// Appends two statement lists.
|
||||
func appendStatements(statements []Statement, appendStatements []Statement) []Statement {
|
||||
for _, s := range appendStatements {
|
||||
statements = appendStatement(statements, s)
|
||||
}
|
||||
|
||||
return statements
|
||||
}
|
||||
|
||||
// Returns policy of given bucket statement.
|
||||
func getBucketPolicy(statement Statement, prefix string) (commonFound, readOnly, writeOnly bool) {
|
||||
if !(statement.Effect == "Allow" && statement.Principal.AWS.Contains("*")) {
|
||||
return commonFound, readOnly, writeOnly
|
||||
}
|
||||
|
||||
if statement.Actions.Intersection(commonBucketActions).Equals(commonBucketActions) &&
|
||||
statement.Conditions == nil {
|
||||
commonFound = true
|
||||
}
|
||||
|
||||
if statement.Actions.Intersection(writeOnlyBucketActions).Equals(writeOnlyBucketActions) &&
|
||||
statement.Conditions == nil {
|
||||
writeOnly = true
|
||||
}
|
||||
|
||||
if statement.Actions.Intersection(readOnlyBucketActions).Equals(readOnlyBucketActions) {
|
||||
if prefix != "" && statement.Conditions != nil {
|
||||
if stringEqualsValue, ok := statement.Conditions["StringEquals"]; ok {
|
||||
if s3PrefixValues, ok := stringEqualsValue["s3:prefix"]; ok {
|
||||
if s3PrefixValues.Contains(prefix) {
|
||||
readOnly = true
|
||||
}
|
||||
}
|
||||
} else if stringNotEqualsValue, ok := statement.Conditions["StringNotEquals"]; ok {
|
||||
if s3PrefixValues, ok := stringNotEqualsValue["s3:prefix"]; ok {
|
||||
if !s3PrefixValues.Contains(prefix) {
|
||||
readOnly = true
|
||||
}
|
||||
}
|
||||
}
|
||||
} else if prefix == "" && statement.Conditions == nil {
|
||||
readOnly = true
|
||||
} else if prefix != "" && statement.Conditions == nil {
|
||||
readOnly = true
|
||||
}
|
||||
}
|
||||
|
||||
return commonFound, readOnly, writeOnly
|
||||
}
|
||||
|
||||
// Returns policy of given object statement.
|
||||
func getObjectPolicy(statement Statement) (readOnly bool, writeOnly bool) {
|
||||
if statement.Effect == "Allow" &&
|
||||
statement.Principal.AWS.Contains("*") &&
|
||||
statement.Conditions == nil {
|
||||
if statement.Actions.Intersection(readOnlyObjectActions).Equals(readOnlyObjectActions) {
|
||||
readOnly = true
|
||||
}
|
||||
if statement.Actions.Intersection(writeOnlyObjectActions).Equals(writeOnlyObjectActions) {
|
||||
writeOnly = true
|
||||
}
|
||||
}
|
||||
|
||||
return readOnly, writeOnly
|
||||
}
|
||||
|
||||
// Returns policy of given bucket name, prefix in given statements.
|
||||
func GetPolicy(statements []Statement, bucketName string, prefix string) BucketPolicy {
|
||||
bucketResource := awsResourcePrefix + bucketName
|
||||
objectResource := awsResourcePrefix + bucketName + "/" + prefix + "*"
|
||||
|
||||
bucketCommonFound := false
|
||||
bucketReadOnly := false
|
||||
bucketWriteOnly := false
|
||||
matchedResource := ""
|
||||
objReadOnly := false
|
||||
objWriteOnly := false
|
||||
|
||||
for _, s := range statements {
|
||||
matchedObjResources := set.NewStringSet()
|
||||
if s.Resources.Contains(objectResource) {
|
||||
matchedObjResources.Add(objectResource)
|
||||
} else {
|
||||
matchedObjResources = s.Resources.FuncMatch(resourceMatch, objectResource)
|
||||
}
|
||||
|
||||
if !matchedObjResources.IsEmpty() {
|
||||
readOnly, writeOnly := getObjectPolicy(s)
|
||||
for resource := range matchedObjResources {
|
||||
if len(matchedResource) < len(resource) {
|
||||
objReadOnly = readOnly
|
||||
objWriteOnly = writeOnly
|
||||
matchedResource = resource
|
||||
} else if len(matchedResource) == len(resource) {
|
||||
objReadOnly = objReadOnly || readOnly
|
||||
objWriteOnly = objWriteOnly || writeOnly
|
||||
matchedResource = resource
|
||||
}
|
||||
}
|
||||
} else if s.Resources.Contains(bucketResource) {
|
||||
commonFound, readOnly, writeOnly := getBucketPolicy(s, prefix)
|
||||
bucketCommonFound = bucketCommonFound || commonFound
|
||||
bucketReadOnly = bucketReadOnly || readOnly
|
||||
bucketWriteOnly = bucketWriteOnly || writeOnly
|
||||
}
|
||||
}
|
||||
|
||||
policy := BucketPolicyNone
|
||||
if bucketCommonFound {
|
||||
if bucketReadOnly && bucketWriteOnly && objReadOnly && objWriteOnly {
|
||||
policy = BucketPolicyReadWrite
|
||||
} else if bucketReadOnly && objReadOnly {
|
||||
policy = BucketPolicyReadOnly
|
||||
} else if bucketWriteOnly && objWriteOnly {
|
||||
policy = BucketPolicyWriteOnly
|
||||
}
|
||||
}
|
||||
|
||||
return policy
|
||||
}
|
||||
|
||||
// Returns new statements containing policy of given bucket name and
|
||||
// prefix are appended.
|
||||
func SetPolicy(statements []Statement, policy BucketPolicy, bucketName string, prefix string) []Statement {
|
||||
out := removeStatements(statements, bucketName, prefix)
|
||||
// fmt.Println("out = ")
|
||||
// printstatement(out)
|
||||
ns := newStatements(policy, bucketName, prefix)
|
||||
// fmt.Println("ns = ")
|
||||
// printstatement(ns)
|
||||
|
||||
rv := appendStatements(out, ns)
|
||||
// fmt.Println("rv = ")
|
||||
// printstatement(rv)
|
||||
|
||||
return rv
|
||||
}
|
||||
|
||||
// Match function matches wild cards in 'pattern' for resource.
|
||||
func resourceMatch(pattern, resource string) bool {
|
||||
if pattern == "" {
|
||||
return resource == pattern
|
||||
}
|
||||
if pattern == "*" {
|
||||
return true
|
||||
}
|
||||
parts := strings.Split(pattern, "*")
|
||||
if len(parts) == 1 {
|
||||
return resource == pattern
|
||||
}
|
||||
tGlob := strings.HasSuffix(pattern, "*")
|
||||
end := len(parts) - 1
|
||||
if !strings.HasPrefix(resource, parts[0]) {
|
||||
return false
|
||||
}
|
||||
for i := 1; i < end; i++ {
|
||||
if !strings.Contains(resource, parts[i]) {
|
||||
return false
|
||||
}
|
||||
idx := strings.Index(resource, parts[i]) + len(parts[i])
|
||||
resource = resource[idx:]
|
||||
}
|
||||
return tGlob || strings.HasSuffix(resource, parts[end])
|
||||
}
|
||||
Reference in New Issue
Block a user