144 lines
3.7 KiB
Go
144 lines
3.7 KiB
Go
// 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 (
|
|
"encoding/json"
|
|
"path"
|
|
"strings"
|
|
|
|
"github.com/minio/minio/pkg/bucket/policy/condition"
|
|
"github.com/minio/pkg/wildcard"
|
|
)
|
|
|
|
// ResourceARNPrefix - resource ARN prefix as per AWS S3 specification.
|
|
const ResourceARNPrefix = "arn:aws:s3:::"
|
|
|
|
// Resource - resource in policy statement.
|
|
type Resource struct {
|
|
BucketName string
|
|
Pattern string
|
|
}
|
|
|
|
func (r Resource) isBucketPattern() bool {
|
|
return !strings.Contains(r.Pattern, "/") || r.Pattern == "*"
|
|
}
|
|
|
|
func (r Resource) isObjectPattern() bool {
|
|
return strings.Contains(r.Pattern, "/") || strings.Contains(r.BucketName, "*") || r.Pattern == "*/*"
|
|
}
|
|
|
|
// IsValid - checks whether Resource is valid or not.
|
|
func (r Resource) IsValid() bool {
|
|
return r.Pattern != ""
|
|
}
|
|
|
|
// MatchResource matches object name with resource pattern only.
|
|
func (r Resource) MatchResource(resource string) bool {
|
|
return r.Match(resource, nil)
|
|
}
|
|
|
|
// Match - matches object name with resource pattern, including specific conditionals.
|
|
func (r Resource) Match(resource string, conditionValues map[string][]string) bool {
|
|
pattern := r.Pattern
|
|
for _, key := range condition.CommonKeys {
|
|
// Empty values are not supported for policy variables.
|
|
if rvalues, ok := conditionValues[key.Name()]; ok && rvalues[0] != "" {
|
|
pattern = strings.Replace(pattern, key.VarName(), rvalues[0], -1)
|
|
}
|
|
}
|
|
if cp := path.Clean(resource); cp != "." && cp == pattern {
|
|
return true
|
|
}
|
|
return wildcard.Match(pattern, resource)
|
|
}
|
|
|
|
// MarshalJSON - encodes Resource to JSON data.
|
|
func (r Resource) MarshalJSON() ([]byte, error) {
|
|
if !r.IsValid() {
|
|
return nil, Errorf("invalid resource %v", r)
|
|
}
|
|
|
|
return json.Marshal(r.String())
|
|
}
|
|
|
|
func (r Resource) String() string {
|
|
return ResourceARNPrefix + r.Pattern
|
|
}
|
|
|
|
// UnmarshalJSON - decodes JSON data to Resource.
|
|
func (r *Resource) UnmarshalJSON(data []byte) error {
|
|
var s string
|
|
if err := json.Unmarshal(data, &s); err != nil {
|
|
return err
|
|
}
|
|
|
|
parsedResource, err := parseResource(s)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
*r = parsedResource
|
|
|
|
return nil
|
|
}
|
|
|
|
// Validate - validates Resource is for given bucket or not.
|
|
func (r Resource) Validate() error {
|
|
if !r.IsValid() {
|
|
return Errorf("invalid resource")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// parseResource - parses string to Resource.
|
|
func parseResource(s string) (Resource, error) {
|
|
if !strings.HasPrefix(s, ResourceARNPrefix) {
|
|
return Resource{}, Errorf("invalid resource '%v'", s)
|
|
}
|
|
|
|
pattern := strings.TrimPrefix(s, ResourceARNPrefix)
|
|
tokens := strings.SplitN(pattern, "/", 2)
|
|
bucketName := tokens[0]
|
|
if bucketName == "" {
|
|
return Resource{}, Errorf("invalid resource format '%v'", s)
|
|
}
|
|
|
|
return Resource{
|
|
BucketName: bucketName,
|
|
Pattern: pattern,
|
|
}, nil
|
|
}
|
|
|
|
// NewResource - creates new resource.
|
|
func NewResource(bucketName, keyName string) Resource {
|
|
pattern := bucketName
|
|
if keyName != "" {
|
|
if !strings.HasPrefix(keyName, "/") {
|
|
pattern += "/"
|
|
}
|
|
|
|
pattern += keyName
|
|
}
|
|
|
|
return Resource{
|
|
BucketName: bucketName,
|
|
Pattern: pattern,
|
|
}
|
|
}
|