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statement.go
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statement.go
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// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package iampolicy
import (
"strings"
"github.com/minio/pkg/bucket/policy"
"github.com/minio/pkg/bucket/policy/condition"
)
// Statement - iam policy statement.
type Statement struct {
SID policy.ID `json:"Sid,omitempty"`
Effect policy.Effect `json:"Effect"`
Actions ActionSet `json:"Action"`
Resources ResourceSet `json:"Resource,omitempty"`
Conditions condition.Functions `json:"Condition,omitempty"`
}
// IsAllowed - checks given policy args is allowed to continue the Rest API.
func (statement Statement) IsAllowed(args Args) bool {
check := func() bool {
if !statement.Actions.Match(args.Action) {
return false
}
resource := args.BucketName
if args.ObjectName != "" {
if !strings.HasPrefix(args.ObjectName, "/") {
resource += "/"
}
resource += args.ObjectName
} else {
resource += "/"
}
// For admin statements, resource match can be ignored.
if !statement.Resources.Match(resource, args.ConditionValues) && !statement.isAdmin() {
return false
}
return statement.Conditions.Evaluate(args.ConditionValues)
}
return statement.Effect.IsAllowed(check())
}
func (statement Statement) isAdmin() bool {
for action := range statement.Actions {
if AdminAction(action).IsValid() {
return true
}
}
return false
}
// isValid - checks whether statement is valid or not.
func (statement Statement) isValid() error {
if !statement.Effect.IsValid() {
return Errorf("invalid Effect %v", statement.Effect)
}
if len(statement.Actions) == 0 {
return Errorf("Action must not be empty")
}
if statement.isAdmin() {
if err := statement.Actions.ValidateAdmin(); err != nil {
return err
}
for action := range statement.Actions {
keys := statement.Conditions.Keys()
keyDiff := keys.Difference(adminActionConditionKeyMap[action])
if !keyDiff.IsEmpty() {
return Errorf("unsupported condition keys '%v' used for action '%v'", keyDiff, action)
}
}
return nil
}
if !statement.SID.IsValid() {
return Errorf("invalid SID %v", statement.SID)
}
if len(statement.Resources) == 0 {
return Errorf("Resource must not be empty")
}
if err := statement.Resources.Validate(); err != nil {
return err
}
if err := statement.Actions.Validate(); err != nil {
return err
}
for action := range statement.Actions {
if !statement.Resources.objectResourceExists() && !statement.Resources.bucketResourceExists() {
return Errorf("unsupported Resource found %v for action %v", statement.Resources, action)
}
keys := statement.Conditions.Keys()
keyDiff := keys.Difference(iamActionConditionKeyMap.Lookup(action))
if !keyDiff.IsEmpty() {
return Errorf("unsupported condition keys '%v' used for action '%v'", keyDiff, action)
}
}
return nil
}
// Validate - validates Statement is for given bucket or not.
func (statement Statement) Validate() error {
return statement.isValid()
}
// Equals checks if two statements are equal
func (statement Statement) Equals(st Statement) bool {
if statement.Effect != st.Effect {
return false
}
if !statement.Actions.Equals(st.Actions) {
return false
}
if !statement.Resources.Equals(st.Resources) {
return false
}
if !statement.Conditions.Equals(st.Conditions) {
return false
}
return true
}
// Clone clones Statement structure
func (statement Statement) Clone() Statement {
return NewStatement(statement.Effect, statement.Actions.Clone(),
statement.Resources.Clone(), statement.Conditions.Clone())
}
// NewStatement - creates new statement.
func NewStatement(effect policy.Effect, actionSet ActionSet, resourceSet ResourceSet, conditions condition.Functions) Statement {
return Statement{
Effect: effect,
Actions: actionSet,
Resources: resourceSet,
Conditions: conditions,
}
}