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/*
* MinIO Go Library for Amazon S3 Compatible Cloud Storage
* Copyright 2019 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package credentials
import (
"bytes"
"encoding/xml"
"errors"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"strconv"
"time"
)
// AssumeRoleWithWebIdentityResponse contains the result of successful AssumeRoleWithWebIdentity request.
type AssumeRoleWithWebIdentityResponse struct {
XMLName xml.Name `xml:"https://sts.amazonaws.com/doc/2011-06-15/ AssumeRoleWithWebIdentityResponse" json:"-"`
Result WebIdentityResult `xml:"AssumeRoleWithWebIdentityResult"`
ResponseMetadata struct {
RequestID string `xml:"RequestId,omitempty"`
} `xml:"ResponseMetadata,omitempty"`
}
// WebIdentityResult - Contains the response to a successful AssumeRoleWithWebIdentity
// request, including temporary credentials that can be used to make MinIO API requests.
type WebIdentityResult struct {
AssumedRoleUser AssumedRoleUser `xml:",omitempty"`
Audience string `xml:",omitempty"`
Credentials struct {
AccessKey string `xml:"AccessKeyId" json:"accessKey,omitempty"`
SecretKey string `xml:"SecretAccessKey" json:"secretKey,omitempty"`
Expiration time.Time `xml:"Expiration" json:"expiration,omitempty"`
SessionToken string `xml:"SessionToken" json:"sessionToken,omitempty"`
} `xml:",omitempty"`
PackedPolicySize int `xml:",omitempty"`
Provider string `xml:",omitempty"`
SubjectFromWebIdentityToken string `xml:",omitempty"`
}
// WebIdentityToken - web identity token with expiry.
type WebIdentityToken struct {
Token string
AccessToken string
Expiry int
}
// A STSWebIdentity retrieves credentials from MinIO service, and keeps track if
// those credentials are expired.
type STSWebIdentity struct {
Expiry
// Required http Client to use when connecting to MinIO STS service.
Client *http.Client
// Exported STS endpoint to fetch STS credentials.
STSEndpoint string
// Exported GetWebIDTokenExpiry function which returns ID
// tokens from IDP. This function should return two values
// one is ID token which is a self contained ID token (JWT)
// and second return value is the expiry associated with
// this token.
// This is a customer provided function and is mandatory.
GetWebIDTokenExpiry func() (*WebIdentityToken, error)
// RoleARN is the Amazon Resource Name (ARN) of the role that the caller is
// assuming.
RoleARN string
// roleSessionName is the identifier for the assumed role session.
roleSessionName string
}
// NewSTSWebIdentity returns a pointer to a new
// Credentials object wrapping the STSWebIdentity.
func NewSTSWebIdentity(stsEndpoint string, getWebIDTokenExpiry func() (*WebIdentityToken, error)) (*Credentials, error) {
if stsEndpoint == "" {
return nil, errors.New("STS endpoint cannot be empty")
}
if getWebIDTokenExpiry == nil {
return nil, errors.New("Web ID token and expiry retrieval function should be defined")
}
return New(&STSWebIdentity{
Client: &http.Client{
Transport: http.DefaultTransport,
},
STSEndpoint: stsEndpoint,
GetWebIDTokenExpiry: getWebIDTokenExpiry,
}), nil
}
func getWebIdentityCredentials(clnt *http.Client, endpoint, roleARN, roleSessionName string,
getWebIDTokenExpiry func() (*WebIdentityToken, error),
) (AssumeRoleWithWebIdentityResponse, error) {
idToken, err := getWebIDTokenExpiry()
if err != nil {
return AssumeRoleWithWebIdentityResponse{}, err
}
v := url.Values{}
v.Set("Action", "AssumeRoleWithWebIdentity")
if len(roleARN) > 0 {
v.Set("RoleArn", roleARN)
if len(roleSessionName) == 0 {
roleSessionName = strconv.FormatInt(time.Now().UnixNano(), 10)
}
v.Set("RoleSessionName", roleSessionName)
}
v.Set("WebIdentityToken", idToken.Token)
if idToken.AccessToken != "" {
// Usually set when server is using extended userInfo endpoint.
v.Set("WebIdentityAccessToken", idToken.AccessToken)
}
if idToken.Expiry > 0 {
v.Set("DurationSeconds", fmt.Sprintf("%d", idToken.Expiry))
}
v.Set("Version", STSVersion)
u, err := url.Parse(endpoint)
if err != nil {
return AssumeRoleWithWebIdentityResponse{}, err
}
u.RawQuery = v.Encode()
req, err := http.NewRequest(http.MethodPost, u.String(), nil)
if err != nil {
return AssumeRoleWithWebIdentityResponse{}, err
}
resp, err := clnt.Do(req)
if err != nil {
return AssumeRoleWithWebIdentityResponse{}, err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
var errResp ErrorResponse
buf, err := ioutil.ReadAll(resp.Body)
if err != nil {
return AssumeRoleWithWebIdentityResponse{}, err
}
_, err = xmlDecodeAndBody(bytes.NewReader(buf), &errResp)
if err != nil {
var s3Err Error
if _, err = xmlDecodeAndBody(bytes.NewReader(buf), &s3Err); err != nil {
return AssumeRoleWithWebIdentityResponse{}, err
}
errResp.RequestID = s3Err.RequestID
errResp.STSError.Code = s3Err.Code
errResp.STSError.Message = s3Err.Message
}
return AssumeRoleWithWebIdentityResponse{}, errResp
}
a := AssumeRoleWithWebIdentityResponse{}
if err = xml.NewDecoder(resp.Body).Decode(&a); err != nil {
return AssumeRoleWithWebIdentityResponse{}, err
}
return a, nil
}
// Retrieve retrieves credentials from the MinIO service.
// Error will be returned if the request fails.
func (m *STSWebIdentity) Retrieve() (Value, error) {
a, err := getWebIdentityCredentials(m.Client, m.STSEndpoint, m.RoleARN, m.roleSessionName, m.GetWebIDTokenExpiry)
if err != nil {
return Value{}, err
}
// Expiry window is set to 10secs.
m.SetExpiration(a.Result.Credentials.Expiration, DefaultExpiryWindow)
return Value{
AccessKeyID: a.Result.Credentials.AccessKey,
SecretAccessKey: a.Result.Credentials.SecretKey,
SessionToken: a.Result.Credentials.SessionToken,
SignerType: SignatureV4,
}, nil
}
// Expiration returns the expiration time of the credentials
func (m *STSWebIdentity) Expiration() time.Time {
return m.expiration
}
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