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// MinIO Go Library for Amazon S3 Compatible Cloud Storage
// Copyright 2021 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"
"crypto/tls"
"encoding/xml"
"errors"
"io"
"io/ioutil"
"net"
"net/http"
"net/url"
"strconv"
"time"
)
// CertificateIdentityOption is an optional AssumeRoleWithCertificate
// parameter - e.g. a custom HTTP transport configuration or S3 credental
// livetime.
type CertificateIdentityOption func(*STSCertificateIdentity)
// CertificateIdentityWithTransport returns a CertificateIdentityOption that
// customizes the STSCertificateIdentity with the given http.RoundTripper.
func CertificateIdentityWithTransport(t http.RoundTripper) CertificateIdentityOption {
return CertificateIdentityOption(func(i *STSCertificateIdentity) { i.Client.Transport = t })
}
// CertificateIdentityWithExpiry returns a CertificateIdentityOption that
// customizes the STSCertificateIdentity with the given livetime.
//
// Fetched S3 credentials will have the given livetime if the STS server
// allows such credentials.
func CertificateIdentityWithExpiry(livetime time.Duration) CertificateIdentityOption {
return CertificateIdentityOption(func(i *STSCertificateIdentity) { i.S3CredentialLivetime = livetime })
}
// A STSCertificateIdentity retrieves S3 credentials from the MinIO STS API and
// rotates those credentials once they expire.
type STSCertificateIdentity struct {
Expiry
// STSEndpoint is the base URL endpoint of the STS API.
// For example, https://minio.local:9000
STSEndpoint string
// S3CredentialLivetime is the duration temp. S3 access
// credentials should be valid.
//
// It represents the access credential livetime requested
// by the client. The STS server may choose to issue
// temp. S3 credentials that have a different - usually
// shorter - livetime.
//
// The default livetime is one hour.
S3CredentialLivetime time.Duration
// Client is the HTTP client used to authenticate and fetch
// S3 credentials.
//
// A custom TLS client configuration can be specified by
// using a custom http.Transport:
// Client: http.Client {
// Transport: &http.Transport{
// TLSClientConfig: &tls.Config{},
// },
// }
Client http.Client
}
var _ Provider = (*STSWebIdentity)(nil) // compiler check
// NewSTSCertificateIdentity returns a STSCertificateIdentity that authenticates
// to the given STS endpoint with the given TLS certificate and retrieves and
// rotates S3 credentials.
func NewSTSCertificateIdentity(endpoint string, certificate tls.Certificate, options ...CertificateIdentityOption) (*Credentials, error) {
if endpoint == "" {
return nil, errors.New("STS endpoint cannot be empty")
}
if _, err := url.Parse(endpoint); err != nil {
return nil, err
}
identity := &STSCertificateIdentity{
STSEndpoint: endpoint,
Client: http.Client{
Transport: &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
}).DialContext,
ForceAttemptHTTP2: true,
MaxIdleConns: 100,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 5 * time.Second,
TLSClientConfig: &tls.Config{
Certificates: []tls.Certificate{certificate},
},
},
},
}
for _, option := range options {
option(identity)
}
return New(identity), nil
}
// Retrieve fetches a new set of S3 credentials from the configured
// STS API endpoint.
func (i *STSCertificateIdentity) Retrieve() (Value, error) {
endpointURL, err := url.Parse(i.STSEndpoint)
if err != nil {
return Value{}, err
}
livetime := i.S3CredentialLivetime
if livetime == 0 {
livetime = 1 * time.Hour
}
queryValues := url.Values{}
queryValues.Set("Action", "AssumeRoleWithCertificate")
queryValues.Set("Version", STSVersion)
endpointURL.RawQuery = queryValues.Encode()
req, err := http.NewRequest(http.MethodPost, endpointURL.String(), nil)
if err != nil {
return Value{}, err
}
req.Form.Add("DurationSeconds", strconv.FormatUint(uint64(livetime.Seconds()), 10))
resp, err := i.Client.Do(req)
if err != nil {
return Value{}, err
}
if resp.Body != nil {
defer resp.Body.Close()
}
if resp.StatusCode != http.StatusOK {
var errResp ErrorResponse
buf, err := ioutil.ReadAll(resp.Body)
if err != nil {
return Value{}, err
}
_, err = xmlDecodeAndBody(bytes.NewReader(buf), &errResp)
if err != nil {
var s3Err Error
if _, err = xmlDecodeAndBody(bytes.NewReader(buf), &s3Err); err != nil {
return Value{}, err
}
errResp.RequestID = s3Err.RequestID
errResp.STSError.Code = s3Err.Code
errResp.STSError.Message = s3Err.Message
}
return Value{}, errResp
}
const MaxSize = 10 * 1 << 20
var body io.Reader = resp.Body
if resp.ContentLength > 0 && resp.ContentLength < MaxSize {
body = io.LimitReader(body, resp.ContentLength)
} else {
body = io.LimitReader(body, MaxSize)
}
var response assumeRoleWithCertificateResponse
if err = xml.NewDecoder(body).Decode(&response); err != nil {
return Value{}, err
}
i.SetExpiration(response.Result.Credentials.Expiration, DefaultExpiryWindow)
return Value{
AccessKeyID: response.Result.Credentials.AccessKey,
SecretAccessKey: response.Result.Credentials.SecretKey,
SessionToken: response.Result.Credentials.SessionToken,
SignerType: SignatureDefault,
}, nil
}
// Expiration returns the expiration time of the current S3 credentials.
func (i *STSCertificateIdentity) Expiration() time.Time { return i.expiration }
type assumeRoleWithCertificateResponse struct {
XMLName xml.Name `xml:"https://sts.amazonaws.com/doc/2011-06-15/ AssumeRoleWithCertificateResponse" json:"-"`
Result struct {
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:"Credentials" json:"credentials,omitempty"`
} `xml:"AssumeRoleWithCertificateResult"`
ResponseMetadata struct {
RequestID string `xml:"RequestId,omitempty"`
} `xml:"ResponseMetadata,omitempty"`
}
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