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302 lines
9.0 KiB
302 lines
9.0 KiB
/*
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* Minio Cloud Storage, (C) 2015, 2016 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package main
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import (
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"bytes"
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"io"
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"io/ioutil"
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"net/http"
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"strings"
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mux "github.com/gorilla/mux"
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)
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// maximum supported access policy size.
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const maxAccessPolicySize = 20 * 1024 // 20KiB.
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// Verify if a given action is valid for the url path based on the
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// existing bucket access policy.
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func bucketPolicyEvalStatements(action string, resource string, conditions map[string]string, statements []policyStatement) bool {
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for _, statement := range statements {
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if bucketPolicyMatchStatement(action, resource, conditions, statement) {
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if statement.Effect == "Allow" {
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return true
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}
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// Do not uncomment kept here for readability.
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// else statement.Effect == "Deny"
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return false
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}
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}
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// None match so deny.
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return false
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}
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// Verify if action, resource and conditions match input policy statement.
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func bucketPolicyMatchStatement(action string, resource string, conditions map[string]string, statement policyStatement) bool {
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// Verify if action matches.
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if bucketPolicyActionMatch(action, statement) {
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// Verify if resource matches.
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if bucketPolicyResourceMatch(resource, statement) {
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// Verify if condition matches.
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if bucketPolicyConditionMatch(conditions, statement) {
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return true
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}
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}
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}
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return false
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}
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// Verify if given action matches with policy statement.
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func bucketPolicyActionMatch(action string, statement policyStatement) bool {
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for _, policyAction := range statement.Actions {
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if matched := actionMatch(policyAction, action); matched {
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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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// Match function matches wild cards in 'pattern' for 'text'.
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func wildCardMatch(pattern, text string) bool {
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if pattern == "" {
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return text == pattern
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}
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if pattern == "*" {
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return true
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}
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parts := strings.Split(pattern, "*")
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if len(parts) == 1 {
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return text == pattern
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}
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tGlob := strings.HasSuffix(pattern, "*")
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end := len(parts) - 1
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if !strings.HasPrefix(text, parts[0]) {
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return false
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}
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for i := 1; i < end; i++ {
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if !strings.Contains(text, parts[i]) {
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return false
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}
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idx := strings.Index(text, parts[i]) + len(parts[i])
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text = text[idx:]
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}
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return tGlob || strings.HasSuffix(text, parts[end])
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}
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// Match function matches wild cards in 'pattern' for resource.
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func resourceMatch(pattern, resource string) bool {
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return wildCardMatch(pattern, resource)
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}
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// Match function matches wild cards in 'pattern' for action.
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func actionMatch(pattern, action string) bool {
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return wildCardMatch(pattern, action)
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}
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// Verify if given resource matches with policy statement.
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func bucketPolicyResourceMatch(resource string, statement policyStatement) bool {
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for _, resourcep := range statement.Resources {
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// the resource rule for object could contain "*" wild card.
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// the requested object can be given access based on the already set bucket policy if
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// the match is successful.
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// More info: http://docs.aws.amazon.com/AmazonS3/latest/dev/s3-arn-format.html .
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if matched := resourceMatch(resourcep, resource); matched {
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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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// Verify if given condition matches with policy statement.
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func bucketPolicyConditionMatch(conditions map[string]string, statement policyStatement) bool {
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// Supports following conditions.
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// - StringEquals
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// - StringNotEquals
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//
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// Supported applicable condition keys for each conditions.
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// - s3:prefix
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// - s3:max-keys
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var conditionMatches = true
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for condition, conditionKeys := range statement.Conditions {
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if condition == "StringEquals" {
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if conditionKeys["s3:prefix"] != conditions["prefix"] {
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conditionMatches = false
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break
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}
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if conditionKeys["s3:max-keys"] != conditions["max-keys"] {
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conditionMatches = false
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break
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}
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} else if condition == "StringNotEquals" {
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if conditionKeys["s3:prefix"] == conditions["prefix"] {
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conditionMatches = false
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break
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}
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if conditionKeys["s3:max-keys"] == conditions["max-keys"] {
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conditionMatches = false
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break
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}
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}
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}
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return conditionMatches
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}
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// PutBucketPolicyHandler - PUT Bucket policy
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// -----------------
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// This implementation of the PUT operation uses the policy
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// subresource to add to or replace a policy on a bucket
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func (api objectAPIHandlers) PutBucketPolicyHandler(w http.ResponseWriter, r *http.Request) {
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vars := mux.Vars(r)
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bucket := vars["bucket"]
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switch getRequestAuthType(r) {
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default:
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// For all unknown auth types return error.
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writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
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return
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case authTypePresigned, authTypeSigned:
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if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
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writeErrorResponse(w, r, s3Error, r.URL.Path)
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return
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}
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}
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// If Content-Length is unknown or zero, deny the
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// request. PutBucketPolicy always needs a Content-Length if
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// incoming request is not chunked.
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if !contains(r.TransferEncoding, "chunked") {
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if r.ContentLength == -1 || r.ContentLength == 0 {
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writeErrorResponse(w, r, ErrMissingContentLength, r.URL.Path)
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return
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}
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// If Content-Length is greater than maximum allowed policy size.
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if r.ContentLength > maxAccessPolicySize {
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writeErrorResponse(w, r, ErrEntityTooLarge, r.URL.Path)
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return
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}
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}
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// Read access policy up to maxAccessPolicySize.
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// http://docs.aws.amazon.com/AmazonS3/latest/dev/access-policy-language-overview.html
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// bucket policies are limited to 20KB in size, using a limit reader.
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bucketPolicyBuf, err := ioutil.ReadAll(io.LimitReader(r.Body, maxAccessPolicySize))
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if err != nil {
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errorIf(err, "Unable to read bucket policy.")
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writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
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return
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}
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// Parse bucket policy.
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bucketPolicy, err := parseBucketPolicy(bucketPolicyBuf)
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if err != nil {
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errorIf(err, "Unable to parse bucket policy.")
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writeErrorResponse(w, r, ErrInvalidPolicyDocument, r.URL.Path)
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return
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}
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// Parse check bucket policy.
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if s3Error := checkBucketPolicyResources(bucket, bucketPolicy); s3Error != ErrNone {
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writeErrorResponse(w, r, s3Error, r.URL.Path)
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return
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}
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// Save bucket policy.
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if err := writeBucketPolicy(bucket, bucketPolicyBuf); err != nil {
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errorIf(err, "Unable to write bucket policy.")
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switch err.(type) {
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case BucketNameInvalid:
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writeErrorResponse(w, r, ErrInvalidBucketName, r.URL.Path)
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default:
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writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
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}
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return
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}
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writeSuccessNoContent(w)
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}
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// DeleteBucketPolicyHandler - DELETE Bucket policy
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// -----------------
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// This implementation of the DELETE operation uses the policy
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// subresource to add to remove a policy on a bucket.
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func (api objectAPIHandlers) DeleteBucketPolicyHandler(w http.ResponseWriter, r *http.Request) {
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vars := mux.Vars(r)
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bucket := vars["bucket"]
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switch getRequestAuthType(r) {
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default:
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// For all unknown auth types return error.
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writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
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return
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case authTypePresigned, authTypeSigned:
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if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
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writeErrorResponse(w, r, s3Error, r.URL.Path)
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return
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}
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}
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// Delete bucket access policy.
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if err := removeBucketPolicy(bucket); err != nil {
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errorIf(err, "Unable to remove bucket policy.")
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switch err.(type) {
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case BucketNameInvalid:
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writeErrorResponse(w, r, ErrInvalidBucketName, r.URL.Path)
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case BucketPolicyNotFound:
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writeErrorResponse(w, r, ErrNoSuchBucketPolicy, r.URL.Path)
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default:
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writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
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}
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return
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}
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writeSuccessNoContent(w)
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}
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// GetBucketPolicyHandler - GET Bucket policy
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// -----------------
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// This operation uses the policy
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// subresource to return the policy of a specified bucket.
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func (api objectAPIHandlers) GetBucketPolicyHandler(w http.ResponseWriter, r *http.Request) {
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vars := mux.Vars(r)
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bucket := vars["bucket"]
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switch getRequestAuthType(r) {
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default:
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// For all unknown auth types return error.
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writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
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return
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case authTypePresigned, authTypeSigned:
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if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
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writeErrorResponse(w, r, s3Error, r.URL.Path)
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return
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}
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}
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// Read bucket access policy.
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p, err := readBucketPolicy(bucket)
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if err != nil {
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errorIf(err, "Unable to read bucket policy.")
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switch err.(type) {
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case BucketNameInvalid:
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writeErrorResponse(w, r, ErrInvalidBucketName, r.URL.Path)
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case BucketPolicyNotFound:
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writeErrorResponse(w, r, ErrNoSuchBucketPolicy, r.URL.Path)
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default:
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writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
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}
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return
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}
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io.Copy(w, bytes.NewReader(p))
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}
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