mirror of
https://github.com/minio/minio.git
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265 lines
8.5 KiB
Go
265 lines
8.5 KiB
Go
/*
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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 main
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import (
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"bytes"
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"encoding/base64"
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"io"
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"io/ioutil"
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"mime/multipart"
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"net/http"
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"strings"
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"time"
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"github.com/minio/minio/pkg/probe"
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signv4 "github.com/minio/minio/pkg/signature"
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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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// getCredentialsFromAuth parse credentials tag from authorization value
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func getCredentialsFromAuth(authValue string) ([]string, *probe.Error) {
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if authValue == "" {
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return nil, probe.NewError(errMissingAuthHeaderValue)
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}
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authFields := strings.Split(strings.TrimSpace(authValue), ",")
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if len(authFields) != 3 {
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return nil, probe.NewError(errInvalidAuthHeaderValue)
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}
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authPrefixFields := strings.Fields(authFields[0])
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if len(authPrefixFields) != 2 {
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return nil, probe.NewError(errMissingFieldsAuthHeader)
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}
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if authPrefixFields[0] != authHeaderPrefix {
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return nil, probe.NewError(errInvalidAuthHeaderPrefix)
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}
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credentials := strings.Split(strings.TrimSpace(authPrefixFields[1]), "=")
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if len(credentials) != 2 {
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return nil, probe.NewError(errMissingFieldsCredentialTag)
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}
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if len(strings.Split(strings.TrimSpace(authFields[1]), "=")) != 2 {
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return nil, probe.NewError(errMissingFieldsSignedHeadersTag)
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}
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if len(strings.Split(strings.TrimSpace(authFields[2]), "=")) != 2 {
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return nil, probe.NewError(errMissingFieldsSignatureTag)
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}
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credentialElements := strings.Split(strings.TrimSpace(credentials[1]), "/")
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if len(credentialElements) != 5 {
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return nil, probe.NewError(errCredentialTagMalformed)
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}
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return credentialElements, nil
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}
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// verify if authHeader value has valid region
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func isValidRegion(authHeaderValue string) *probe.Error {
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credentialElements, err := getCredentialsFromAuth(authHeaderValue)
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if err != nil {
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return err.Trace()
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}
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region := credentialElements[2]
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if region != "milkyway" {
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return probe.NewError(errInvalidRegion)
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}
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return nil
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}
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// stripAccessKeyID - strip only access key id from auth header
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func stripAccessKeyID(authHeaderValue string) (string, *probe.Error) {
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if err := isValidRegion(authHeaderValue); err != nil {
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return "", err.Trace()
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}
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credentialElements, err := getCredentialsFromAuth(authHeaderValue)
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if err != nil {
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return "", err.Trace()
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}
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accessKeyID := credentialElements[0]
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if !IsValidAccessKey(accessKeyID) {
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return "", probe.NewError(errAccessKeyIDInvalid)
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}
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return accessKeyID, nil
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}
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// initSignatureV4 initializing signature verification
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func initSignatureV4(req *http.Request) (*signv4.Signature, *probe.Error) {
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// strip auth from authorization header
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authHeaderValue := req.Header.Get("Authorization")
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accessKeyID, err := stripAccessKeyID(authHeaderValue)
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if err != nil {
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return nil, err.Trace()
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}
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authConfig, err := LoadConfig()
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if err != nil {
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return nil, err.Trace()
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}
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authFields := strings.Split(strings.TrimSpace(authHeaderValue), ",")
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signedHeaders := strings.Split(strings.Split(strings.TrimSpace(authFields[1]), "=")[1], ";")
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signature := strings.Split(strings.TrimSpace(authFields[2]), "=")[1]
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for _, user := range authConfig.Users {
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if user.AccessKeyID == accessKeyID {
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signature := &signv4.Signature{
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AccessKeyID: user.AccessKeyID,
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SecretAccessKey: user.SecretAccessKey,
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Signature: signature,
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SignedHeaders: signedHeaders,
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Request: req,
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}
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return signature, nil
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}
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}
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return nil, probe.NewError(errAccessKeyIDInvalid)
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}
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func extractHTTPFormValues(reader *multipart.Reader) (io.Reader, map[string]string, *probe.Error) {
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/// HTML Form values
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formValues := make(map[string]string)
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filePart := new(bytes.Buffer)
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var err error
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for err == nil {
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var part *multipart.Part
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part, err = reader.NextPart()
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if part != nil {
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if part.FileName() == "" {
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buffer, err := ioutil.ReadAll(part)
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if err != nil {
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return nil, nil, probe.NewError(err)
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}
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formValues[http.CanonicalHeaderKey(part.FormName())] = string(buffer)
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} else {
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_, err := io.Copy(filePart, part)
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if err != nil {
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return nil, nil, probe.NewError(err)
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}
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}
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}
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}
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return filePart, formValues, nil
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}
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func applyPolicy(formValues map[string]string) *probe.Error {
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if formValues["X-Amz-Algorithm"] != "AWS4-HMAC-SHA256" {
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return probe.NewError(errUnsupportedAlgorithm)
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}
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/// Decoding policy
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policyBytes, err := base64.StdEncoding.DecodeString(formValues["Policy"])
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if err != nil {
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return probe.NewError(err)
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}
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postPolicyForm, perr := signv4.ParsePostPolicyForm(string(policyBytes))
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if perr != nil {
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return perr.Trace()
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}
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if !postPolicyForm.Expiration.After(time.Now().UTC()) {
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return probe.NewError(errPolicyAlreadyExpired)
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}
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if postPolicyForm.Conditions.Policies["$bucket"].Operator == "eq" {
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if formValues["Bucket"] != postPolicyForm.Conditions.Policies["$bucket"].Value {
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return probe.NewError(errPolicyMissingFields)
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}
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}
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if postPolicyForm.Conditions.Policies["$x-amz-date"].Operator == "eq" {
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if formValues["X-Amz-Date"] != postPolicyForm.Conditions.Policies["$x-amz-date"].Value {
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return probe.NewError(errPolicyMissingFields)
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}
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}
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if postPolicyForm.Conditions.Policies["$Content-Type"].Operator == "starts-with" {
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if !strings.HasPrefix(formValues["Content-Type"], postPolicyForm.Conditions.Policies["$Content-Type"].Value) {
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return probe.NewError(errPolicyMissingFields)
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}
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}
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if postPolicyForm.Conditions.Policies["$Content-Type"].Operator == "eq" {
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if formValues["Content-Type"] != postPolicyForm.Conditions.Policies["$Content-Type"].Value {
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return probe.NewError(errPolicyMissingFields)
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}
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}
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if postPolicyForm.Conditions.Policies["$key"].Operator == "starts-with" {
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if !strings.HasPrefix(formValues["Key"], postPolicyForm.Conditions.Policies["$key"].Value) {
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return probe.NewError(errPolicyMissingFields)
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}
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}
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if postPolicyForm.Conditions.Policies["$key"].Operator == "eq" {
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if formValues["Key"] != postPolicyForm.Conditions.Policies["$key"].Value {
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return probe.NewError(errPolicyMissingFields)
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}
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}
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return nil
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}
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// initPostPresignedPolicyV4 initializing post policy signature verification
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func initPostPresignedPolicyV4(formValues map[string]string) (*signv4.Signature, *probe.Error) {
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credentialElements := strings.Split(strings.TrimSpace(formValues["X-Amz-Credential"]), "/")
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if len(credentialElements) != 5 {
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return nil, probe.NewError(errCredentialTagMalformed)
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}
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accessKeyID := credentialElements[0]
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if !IsValidAccessKey(accessKeyID) {
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return nil, probe.NewError(errAccessKeyIDInvalid)
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}
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authConfig, perr := LoadConfig()
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if perr != nil {
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return nil, perr.Trace()
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}
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for _, user := range authConfig.Users {
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if user.AccessKeyID == accessKeyID {
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signature := &signv4.Signature{
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AccessKeyID: user.AccessKeyID,
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SecretAccessKey: user.SecretAccessKey,
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Signature: formValues["X-Amz-Signature"],
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PresignedPolicy: formValues["Policy"],
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}
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return signature, nil
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}
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}
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return nil, probe.NewError(errAccessKeyIDInvalid)
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}
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// initPresignedSignatureV4 initializing presigned signature verification
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func initPresignedSignatureV4(req *http.Request) (*signv4.Signature, *probe.Error) {
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credentialElements := strings.Split(strings.TrimSpace(req.URL.Query().Get("X-Amz-Credential")), "/")
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if len(credentialElements) != 5 {
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return nil, probe.NewError(errCredentialTagMalformed)
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}
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accessKeyID := credentialElements[0]
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if !IsValidAccessKey(accessKeyID) {
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return nil, probe.NewError(errAccessKeyIDInvalid)
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}
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authConfig, err := LoadConfig()
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if err != nil {
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return nil, err.Trace()
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}
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signedHeaders := strings.Split(strings.TrimSpace(req.URL.Query().Get("X-Amz-SignedHeaders")), ";")
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signature := strings.TrimSpace(req.URL.Query().Get("X-Amz-Signature"))
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for _, user := range authConfig.Users {
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if user.AccessKeyID == accessKeyID {
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signature := &signv4.Signature{
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AccessKeyID: user.AccessKeyID,
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SecretAccessKey: user.SecretAccessKey,
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Signature: signature,
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SignedHeaders: signedHeaders,
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Presigned: true,
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Request: req,
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}
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return signature, nil
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}
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}
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return nil, probe.NewError(errAccessKeyIDInvalid)
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}
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