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/*
* MinIO Go Library for Amazon S3 Compatible Cloud Storage
* Copyright 2019-2021 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"
"encoding/xml"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"time"
)
// AssumeRoleWithLDAPResponse contains the result of successful
// AssumeRoleWithLDAPIdentity request
type AssumeRoleWithLDAPResponse struct {
XMLName xml.Name `xml:"https://sts.amazonaws.com/doc/2011-06-15/ AssumeRoleWithLDAPIdentityResponse" json:"-"`
Result LDAPIdentityResult `xml:"AssumeRoleWithLDAPIdentityResult"`
ResponseMetadata struct {
RequestID string `xml:"RequestId,omitempty"`
} `xml:"ResponseMetadata,omitempty"`
}
// LDAPIdentityResult - contains credentials for a successful
// AssumeRoleWithLDAPIdentity request.
type LDAPIdentityResult 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:",omitempty"`
SubjectFromToken string `xml:",omitempty"`
}
// LDAPIdentity retrieves credentials from MinIO
type LDAPIdentity 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
// LDAP username/password used to fetch LDAP STS credentials.
LDAPUsername, LDAPPassword string
// Session policy to apply to the generated credentials. Leave empty to
// use the full access policy available to the user.
Policy string
// RequestedExpiry is the configured expiry duration for credentials
// requested from LDAP.
RequestedExpiry time.Duration
}
// NewLDAPIdentity returns new credentials object that uses LDAP
// Identity.
func NewLDAPIdentity(stsEndpoint, ldapUsername, ldapPassword string, optFuncs ...LDAPIdentityOpt) (*Credentials, error) {
l := LDAPIdentity{
Client: &http.Client{Transport: http.DefaultTransport},
STSEndpoint: stsEndpoint,
LDAPUsername: ldapUsername,
LDAPPassword: ldapPassword,
}
for _, optFunc := range optFuncs {
optFunc(&l)
}
return New(&l), nil
}
// LDAPIdentityOpt is a function type used to configured the LDAPIdentity
// instance.
type LDAPIdentityOpt func(*LDAPIdentity)
// LDAPIdentityPolicyOpt sets the session policy for requested credentials.
func LDAPIdentityPolicyOpt(policy string) LDAPIdentityOpt {
return func(k *LDAPIdentity) {
k.Policy = policy
}
}
// LDAPIdentityExpiryOpt sets the expiry duration for requested credentials.
func LDAPIdentityExpiryOpt(d time.Duration) LDAPIdentityOpt {
return func(k *LDAPIdentity) {
k.RequestedExpiry = d
}
}
func stripPassword(err error) error {
urlErr, ok := err.(*url.Error)
if ok {
u, _ := url.Parse(urlErr.URL)
if u == nil {
return urlErr
}
values := u.Query()
values.Set("LDAPPassword", "xxxxx")
u.RawQuery = values.Encode()
urlErr.URL = u.String()
return urlErr
}
return err
}
// NewLDAPIdentityWithSessionPolicy returns new credentials object that uses
// LDAP Identity with a specified session policy. The `policy` parameter must be
// a JSON string specifying the policy document.
//
// Deprecated: Use the `LDAPIdentityPolicyOpt` with `NewLDAPIdentity` instead.
func NewLDAPIdentityWithSessionPolicy(stsEndpoint, ldapUsername, ldapPassword, policy string) (*Credentials, error) {
return New(&LDAPIdentity{
Client: &http.Client{Transport: http.DefaultTransport},
STSEndpoint: stsEndpoint,
LDAPUsername: ldapUsername,
LDAPPassword: ldapPassword,
Policy: policy,
}), nil
}
// Retrieve gets the credential by calling the MinIO STS API for
// LDAP on the configured stsEndpoint.
func (k *LDAPIdentity) Retrieve() (value Value, err error) {
u, err := url.Parse(k.STSEndpoint)
if err != nil {
return value, err
}
v := url.Values{}
v.Set("Action", "AssumeRoleWithLDAPIdentity")
v.Set("Version", STSVersion)
v.Set("LDAPUsername", k.LDAPUsername)
v.Set("LDAPPassword", k.LDAPPassword)
if k.Policy != "" {
v.Set("Policy", k.Policy)
}
if k.RequestedExpiry != 0 {
v.Set("DurationSeconds", fmt.Sprintf("%d", int(k.RequestedExpiry.Seconds())))
}
u.RawQuery = v.Encode()
req, err := http.NewRequest(http.MethodPost, u.String(), nil)
if err != nil {
return value, stripPassword(err)
}
resp, err := k.Client.Do(req)
if err != nil {
return value, stripPassword(err)
}
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
}
r := AssumeRoleWithLDAPResponse{}
if err = xml.NewDecoder(resp.Body).Decode(&r); err != nil {
return
}
cr := r.Result.Credentials
k.SetExpiration(cr.Expiration, DefaultExpiryWindow)
return Value{
AccessKeyID: cr.AccessKey,
SecretAccessKey: cr.SecretKey,
SessionToken: cr.SessionToken,
SignerType: SignatureV4,
}, nil
}
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