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https://github.com/minio/minio.git
synced 2025-11-09 13:39:46 -05:00
xl: Moved to minio/minio - fixes #1112
This commit is contained in:
Harshavardhana
48
pkg/signature/errors.go
Normal file
48
pkg/signature/errors.go
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@@ -0,0 +1,48 @@
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/*
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* Minio Cloud Storage, (C) 2015 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 signature
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// MissingDateHeader date header missing
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type MissingDateHeader struct{}
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func (e MissingDateHeader) Error() string {
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return "Missing date header"
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}
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// MissingExpiresQuery expires query string missing
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type MissingExpiresQuery struct{}
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func (e MissingExpiresQuery) Error() string {
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return "Missing expires query string"
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}
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// ExpiredPresignedRequest request already expired
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type ExpiredPresignedRequest struct{}
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func (e ExpiredPresignedRequest) Error() string {
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return "Presigned request already expired"
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}
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// SigDoesNotMatch invalid signature
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type SigDoesNotMatch struct {
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SignatureSent string
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SignatureCalculated string
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}
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func (e SigDoesNotMatch) Error() string {
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return "The request signature we calculated does not match the signature you provided"
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}
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157
pkg/signature/postpolicyform.go
Normal file
157
pkg/signature/postpolicyform.go
Normal file
@@ -0,0 +1,157 @@
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/*
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* Minio Cloud Storage, (C) 2015 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 signature
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import (
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"encoding/json"
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"fmt"
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"reflect"
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"time"
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"github.com/minio/minio/pkg/probe"
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)
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// toString - Safely convert interface to string without causing panic.
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func toString(val interface{}) string {
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switch v := val.(type) {
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case string:
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return v
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}
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return ""
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}
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// toInteger _ Safely convert interface to integer without causing panic.
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func toInteger(val interface{}) int {
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switch v := val.(type) {
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case int:
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return v
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}
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return 0
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}
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// isString - Safely check if val is of type string without causing panic.
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func isString(val interface{}) bool {
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switch val.(type) {
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case string:
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return true
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}
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return false
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}
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// PostPolicyForm provides strict static type conversion and validation for Amazon S3's POST policy JSON string.
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type PostPolicyForm struct {
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Expiration time.Time // Expiration date and time of the POST policy.
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Conditions struct { // Conditional policy structure.
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Policies map[string]struct {
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Operator string
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Value string
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}
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ContentLengthRange struct {
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Min int
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Max int
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}
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}
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}
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// ParsePostPolicyForm - Parse JSON policy string into typed POostPolicyForm structure.
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func ParsePostPolicyForm(policy string) (PostPolicyForm, *probe.Error) {
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// Convert po into interfaces and
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// perform strict type conversion using reflection.
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var rawPolicy struct {
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Expiration string `json:"expiration"`
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Conditions []interface{} `json:"conditions"`
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}
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e := json.Unmarshal([]byte(policy), &rawPolicy)
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if e != nil {
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return PostPolicyForm{}, probe.NewError(e)
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}
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parsedPolicy := PostPolicyForm{}
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// Parse expiry time.
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parsedPolicy.Expiration, e = time.Parse(time.RFC3339Nano, rawPolicy.Expiration)
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if e != nil {
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return PostPolicyForm{}, probe.NewError(e)
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}
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parsedPolicy.Conditions.Policies = make(map[string]struct {
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Operator string
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Value string
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})
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// Parse conditions.
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for _, val := range rawPolicy.Conditions {
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switch condt := val.(type) {
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case map[string]interface{}: // Handle key:value map types.
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for k, v := range condt {
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if !isString(v) { // Pre-check value type.
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// All values must be of type string.
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return parsedPolicy, probe.NewError(fmt.Errorf("Unknown type %s of conditional field value %s found in POST policy form.",
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reflect.TypeOf(condt).String(), condt))
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}
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// {"acl": "public-read" } is an alternate way to indicate - [ "eq", "$acl", "public-read" ]
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// In this case we will just collapse this into "eq" for all use cases.
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parsedPolicy.Conditions.Policies["$"+k] = struct {
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Operator string
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Value string
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}{
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Operator: "eq",
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Value: toString(v),
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}
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}
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case []interface{}: // Handle array types.
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if len(condt) != 3 { // Return error if we have insufficient elements.
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return parsedPolicy, probe.NewError(fmt.Errorf("Malformed conditional fields %s of type %s found in POST policy form.",
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condt, reflect.TypeOf(condt).String()))
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}
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switch toString(condt[0]) {
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case "eq", "starts-with":
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for _, v := range condt { // Pre-check all values for type.
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if !isString(v) {
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// All values must be of type string.
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return parsedPolicy, probe.NewError(fmt.Errorf("Unknown type %s of conditional field value %s found in POST policy form.",
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reflect.TypeOf(condt).String(), condt))
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}
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}
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operator, matchType, value := toString(condt[0]), toString(condt[1]), toString(condt[2])
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parsedPolicy.Conditions.Policies[matchType] = struct {
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Operator string
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Value string
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}{
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Operator: operator,
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Value: value,
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}
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case "content-length-range":
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parsedPolicy.Conditions.ContentLengthRange = struct {
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Min int
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Max int
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}{
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Min: toInteger(condt[1]),
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Max: toInteger(condt[2]),
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}
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default:
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// Condition should be valid.
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return parsedPolicy, probe.NewError(fmt.Errorf("Unknown type %s of conditional field value %s found in POST policy form.",
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reflect.TypeOf(condt).String(), condt))
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}
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default:
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return parsedPolicy, probe.NewError(fmt.Errorf("Unknown field %s of type %s found in POST policy form.",
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condt, reflect.TypeOf(condt).String()))
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}
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}
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return parsedPolicy, nil
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}
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373
pkg/signature/signature-v4.go
Normal file
373
pkg/signature/signature-v4.go
Normal file
@@ -0,0 +1,373 @@
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/*
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* Minio Cloud Storage, (C) 2015 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
|
||||
* 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 signature
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import (
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"bytes"
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"crypto/hmac"
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"encoding/hex"
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"net/http"
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"net/url"
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"regexp"
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"sort"
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"strconv"
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"strings"
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"time"
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"unicode/utf8"
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"github.com/minio/minio/pkg/crypto/sha256"
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"github.com/minio/minio/pkg/probe"
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)
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// Signature - local variables
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type Signature struct {
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AccessKeyID string
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SecretAccessKey string
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Region string
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Presigned bool
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PresignedPolicy string
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SignedHeaders []string
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Signature string
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Request *http.Request
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}
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const (
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authHeaderPrefix = "AWS4-HMAC-SHA256"
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iso8601Format = "20060102T150405Z"
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yyyymmdd = "20060102"
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)
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// sumHMAC calculate hmac between two input byte array
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func sumHMAC(key []byte, data []byte) []byte {
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hash := hmac.New(sha256.New, key)
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hash.Write(data)
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return hash.Sum(nil)
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}
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// getURLEncodedName encode the strings from UTF-8 byte representations to HTML hex escape sequences
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//
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// This is necessary since regular url.Parse() and url.Encode() functions do not support UTF-8
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// non english characters cannot be parsed due to the nature in which url.Encode() is written
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//
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// This function on the other hand is a direct replacement for url.Encode() technique to support
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// pretty much every UTF-8 character.
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func getURLEncodedName(name string) string {
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// if object matches reserved string, no need to encode them
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reservedNames := regexp.MustCompile("^[a-zA-Z0-9-_.~/]+$")
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if reservedNames.MatchString(name) {
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return name
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}
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var encodedName string
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for _, s := range name {
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if 'A' <= s && s <= 'Z' || 'a' <= s && s <= 'z' || '0' <= s && s <= '9' { // §2.3 Unreserved characters (mark)
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encodedName = encodedName + string(s)
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continue
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}
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switch s {
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case '-', '_', '.', '~', '/': // §2.3 Unreserved characters (mark)
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encodedName = encodedName + string(s)
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continue
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default:
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len := utf8.RuneLen(s)
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if len < 0 {
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return name
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}
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u := make([]byte, len)
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utf8.EncodeRune(u, s)
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for _, r := range u {
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hex := hex.EncodeToString([]byte{r})
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encodedName = encodedName + "%" + strings.ToUpper(hex)
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}
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}
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}
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return encodedName
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}
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// getCanonicalHeaders generate a list of request headers with their values
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func (r Signature) getCanonicalHeaders(signedHeaders map[string][]string) string {
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var headers []string
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vals := make(map[string][]string)
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for k, vv := range signedHeaders {
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headers = append(headers, strings.ToLower(k))
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vals[strings.ToLower(k)] = vv
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}
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headers = append(headers, "host")
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sort.Strings(headers)
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var buf bytes.Buffer
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for _, k := range headers {
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buf.WriteString(k)
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buf.WriteByte(':')
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switch {
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case k == "host":
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buf.WriteString(r.Request.Host)
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fallthrough
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default:
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for idx, v := range vals[k] {
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if idx > 0 {
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buf.WriteByte(',')
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}
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buf.WriteString(v)
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}
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buf.WriteByte('\n')
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}
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}
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return buf.String()
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}
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// getSignedHeaders generate a string i.e alphabetically sorted, semicolon-separated list of lowercase request header names
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func (r Signature) getSignedHeaders(signedHeaders map[string][]string) string {
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var headers []string
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for k := range signedHeaders {
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headers = append(headers, strings.ToLower(k))
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}
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headers = append(headers, "host")
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sort.Strings(headers)
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return strings.Join(headers, ";")
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}
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// extractSignedHeaders extract signed headers from Authorization header
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func (r Signature) extractSignedHeaders() map[string][]string {
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extractedSignedHeadersMap := make(map[string][]string)
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for _, header := range r.SignedHeaders {
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val, ok := r.Request.Header[http.CanonicalHeaderKey(header)]
|
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if !ok {
|
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// Golang http server strips off 'Expect' header, if the
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// client sent this as part of signed headers we need to
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// handle otherwise we would see a signature mismatch.
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// `aws-cli` sets this as part of signed headers which is
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// a bad idea since servers trying to implement AWS
|
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// Signature version '4' will all encounter this issue.
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//
|
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// According to
|
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// http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.20
|
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// Expect header is always of form:
|
||||
//
|
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// Expect = "Expect" ":" 1#expectation
|
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// expectation = "100-continue" | expectation-extension
|
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//
|
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// So it safe to assume that '100-continue' is what would
|
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// be sent, for the time being keep this work around.
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// Adding a *TODO* to remove this later when Golang server
|
||||
// doesn't filter out the 'Expect' header.
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if header == "expect" {
|
||||
extractedSignedHeadersMap[header] = []string{"100-continue"}
|
||||
}
|
||||
// if not found continue, we will fail later
|
||||
continue
|
||||
}
|
||||
extractedSignedHeadersMap[header] = val
|
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}
|
||||
return extractedSignedHeadersMap
|
||||
}
|
||||
|
||||
// getCanonicalRequest generate a canonical request of style
|
||||
//
|
||||
// canonicalRequest =
|
||||
// <HTTPMethod>\n
|
||||
// <CanonicalURI>\n
|
||||
// <CanonicalQueryString>\n
|
||||
// <CanonicalHeaders>\n
|
||||
// <SignedHeaders>\n
|
||||
// <HashedPayload>
|
||||
//
|
||||
func (r *Signature) getCanonicalRequest() string {
|
||||
payload := r.Request.Header.Get(http.CanonicalHeaderKey("x-amz-content-sha256"))
|
||||
r.Request.URL.RawQuery = strings.Replace(r.Request.URL.Query().Encode(), "+", "%20", -1)
|
||||
encodedPath := getURLEncodedName(r.Request.URL.Path)
|
||||
// convert any space strings back to "+"
|
||||
encodedPath = strings.Replace(encodedPath, "+", "%20", -1)
|
||||
canonicalRequest := strings.Join([]string{
|
||||
r.Request.Method,
|
||||
encodedPath,
|
||||
r.Request.URL.RawQuery,
|
||||
r.getCanonicalHeaders(r.extractSignedHeaders()),
|
||||
r.getSignedHeaders(r.extractSignedHeaders()),
|
||||
payload,
|
||||
}, "\n")
|
||||
return canonicalRequest
|
||||
}
|
||||
|
||||
// getCanonicalRequest generate a canonical request of style
|
||||
//
|
||||
// canonicalRequest =
|
||||
// <HTTPMethod>\n
|
||||
// <CanonicalURI>\n
|
||||
// <CanonicalQueryString>\n
|
||||
// <CanonicalHeaders>\n
|
||||
// <SignedHeaders>\n
|
||||
// <HashedPayload>
|
||||
//
|
||||
func (r Signature) getPresignedCanonicalRequest(presignedQuery string) string {
|
||||
rawQuery := strings.Replace(presignedQuery, "+", "%20", -1)
|
||||
encodedPath := getURLEncodedName(r.Request.URL.Path)
|
||||
// convert any space strings back to "+"
|
||||
encodedPath = strings.Replace(encodedPath, "+", "%20", -1)
|
||||
canonicalRequest := strings.Join([]string{
|
||||
r.Request.Method,
|
||||
encodedPath,
|
||||
rawQuery,
|
||||
r.getCanonicalHeaders(r.extractSignedHeaders()),
|
||||
r.getSignedHeaders(r.extractSignedHeaders()),
|
||||
"UNSIGNED-PAYLOAD",
|
||||
}, "\n")
|
||||
return canonicalRequest
|
||||
}
|
||||
|
||||
// getScope generate a string of a specific date, an AWS region, and a service
|
||||
func (r Signature) getScope(t time.Time) string {
|
||||
scope := strings.Join([]string{
|
||||
t.Format(yyyymmdd),
|
||||
r.Region,
|
||||
"s3",
|
||||
"aws4_request",
|
||||
}, "/")
|
||||
return scope
|
||||
}
|
||||
|
||||
// getStringToSign a string based on selected query values
|
||||
func (r Signature) getStringToSign(canonicalRequest string, t time.Time) string {
|
||||
stringToSign := authHeaderPrefix + "\n" + t.Format(iso8601Format) + "\n"
|
||||
stringToSign = stringToSign + r.getScope(t) + "\n"
|
||||
canonicalRequestBytes := sha256.Sum256([]byte(canonicalRequest))
|
||||
stringToSign = stringToSign + hex.EncodeToString(canonicalRequestBytes[:])
|
||||
return stringToSign
|
||||
}
|
||||
|
||||
// getSigningKey hmac seed to calculate final signature
|
||||
func (r Signature) getSigningKey(t time.Time) []byte {
|
||||
secret := r.SecretAccessKey
|
||||
date := sumHMAC([]byte("AWS4"+secret), []byte(t.Format(yyyymmdd)))
|
||||
region := sumHMAC(date, []byte(r.Region))
|
||||
service := sumHMAC(region, []byte("s3"))
|
||||
signingKey := sumHMAC(service, []byte("aws4_request"))
|
||||
return signingKey
|
||||
}
|
||||
|
||||
// getSignature final signature in hexadecimal form
|
||||
func (r Signature) getSignature(signingKey []byte, stringToSign string) string {
|
||||
return hex.EncodeToString(sumHMAC(signingKey, []byte(stringToSign)))
|
||||
}
|
||||
|
||||
// DoesPolicySignatureMatch - Verify query headers with post policy
|
||||
// - http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-HTTPPOSTConstructPolicy.html
|
||||
// returns true if matches, false otherwise. if error is not nil then it is always false
|
||||
func (r *Signature) DoesPolicySignatureMatch(date string) (bool, *probe.Error) {
|
||||
t, err := time.Parse(iso8601Format, date)
|
||||
if err != nil {
|
||||
return false, probe.NewError(err)
|
||||
}
|
||||
signingKey := r.getSigningKey(t)
|
||||
stringToSign := string(r.PresignedPolicy)
|
||||
newSignature := r.getSignature(signingKey, stringToSign)
|
||||
if newSignature != r.Signature {
|
||||
return false, nil
|
||||
}
|
||||
return true, nil
|
||||
}
|
||||
|
||||
// DoesPresignedSignatureMatch - Verify query headers with presigned signature
|
||||
// - http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-query-string-auth.html
|
||||
// returns true if matches, false otherwise. if error is not nil then it is always false
|
||||
func (r *Signature) DoesPresignedSignatureMatch() (bool, *probe.Error) {
|
||||
query := make(url.Values)
|
||||
query.Set("X-Amz-Algorithm", authHeaderPrefix)
|
||||
|
||||
var date string
|
||||
if date = r.Request.URL.Query().Get("X-Amz-Date"); date == "" {
|
||||
return false, probe.NewError(MissingDateHeader{})
|
||||
}
|
||||
t, err := time.Parse(iso8601Format, date)
|
||||
if err != nil {
|
||||
return false, probe.NewError(err)
|
||||
}
|
||||
if _, ok := r.Request.URL.Query()["X-Amz-Expires"]; !ok {
|
||||
return false, probe.NewError(MissingExpiresQuery{})
|
||||
}
|
||||
expireSeconds, err := strconv.Atoi(r.Request.URL.Query().Get("X-Amz-Expires"))
|
||||
if err != nil {
|
||||
return false, probe.NewError(err)
|
||||
}
|
||||
if time.Now().UTC().Sub(t) > time.Duration(expireSeconds)*time.Second {
|
||||
return false, probe.NewError(ExpiredPresignedRequest{})
|
||||
}
|
||||
query.Set("X-Amz-Date", t.Format(iso8601Format))
|
||||
query.Set("X-Amz-Expires", strconv.Itoa(expireSeconds))
|
||||
query.Set("X-Amz-SignedHeaders", r.getSignedHeaders(r.extractSignedHeaders()))
|
||||
query.Set("X-Amz-Credential", r.AccessKeyID+"/"+r.getScope(t))
|
||||
|
||||
// Save other headers available in the request parameters.
|
||||
for k, v := range r.Request.URL.Query() {
|
||||
if strings.HasPrefix(strings.ToLower(k), "x-amz") {
|
||||
continue
|
||||
}
|
||||
query[k] = v
|
||||
}
|
||||
encodedQuery := query.Encode()
|
||||
|
||||
// Verify if date query is same.
|
||||
if r.Request.URL.Query().Get("X-Amz-Date") != query.Get("X-Amz-Date") {
|
||||
return false, nil
|
||||
}
|
||||
// Verify if expires query is same.
|
||||
if r.Request.URL.Query().Get("X-Amz-Expires") != query.Get("X-Amz-Expires") {
|
||||
return false, nil
|
||||
}
|
||||
// Verify if signed headers query is same.
|
||||
if r.Request.URL.Query().Get("X-Amz-SignedHeaders") != query.Get("X-Amz-SignedHeaders") {
|
||||
return false, nil
|
||||
}
|
||||
// Verify if credential query is same.
|
||||
if r.Request.URL.Query().Get("X-Amz-Credential") != query.Get("X-Amz-Credential") {
|
||||
return false, nil
|
||||
}
|
||||
// Verify finally if signature is same.
|
||||
newSignature := r.getSignature(r.getSigningKey(t), r.getStringToSign(r.getPresignedCanonicalRequest(encodedQuery), t))
|
||||
if r.Request.URL.Query().Get("X-Amz-Signature") != newSignature {
|
||||
return false, nil
|
||||
}
|
||||
return true, nil
|
||||
}
|
||||
|
||||
// DoesSignatureMatch - Verify authorization header with calculated header in accordance with
|
||||
// - http://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-authenticating-requests.html
|
||||
// returns true if matches, false otherwise. if error is not nil then it is always false
|
||||
func (r *Signature) DoesSignatureMatch(hashedPayload string) (bool, *probe.Error) {
|
||||
// set new calculated payload
|
||||
r.Request.Header.Set("X-Amz-Content-Sha256", hashedPayload)
|
||||
|
||||
// Add date if not present throw error
|
||||
var date string
|
||||
if date = r.Request.Header.Get(http.CanonicalHeaderKey("x-amz-date")); date == "" {
|
||||
if date = r.Request.Header.Get("Date"); date == "" {
|
||||
return false, probe.NewError(MissingDateHeader{})
|
||||
}
|
||||
}
|
||||
t, err := time.Parse(iso8601Format, date)
|
||||
if err != nil {
|
||||
return false, probe.NewError(err)
|
||||
}
|
||||
canonicalRequest := r.getCanonicalRequest()
|
||||
stringToSign := r.getStringToSign(canonicalRequest, t)
|
||||
signingKey := r.getSigningKey(t)
|
||||
newSignature := r.getSignature(signingKey, stringToSign)
|
||||
|
||||
if newSignature != r.Signature {
|
||||
return false, nil
|
||||
}
|
||||
return true, nil
|
||||
}
|
||||
Reference in New Issue
Block a user