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minio/cmd/sts-handlers.go

575 lines
18 KiB

/*
* MinIO Cloud Storage, (C) 2018, 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 cmd
import (
"bytes"
"context"
"encoding/base64"
"fmt"
"net/http"
"github.com/gorilla/mux"
xldap "github.com/minio/minio/cmd/config/identity/ldap"
"github.com/minio/minio/cmd/config/identity/openid"
xhttp "github.com/minio/minio/cmd/http"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/auth"
iampolicy "github.com/minio/minio/pkg/iam/policy"
"github.com/minio/minio/pkg/wildcard"
ldap "gopkg.in/ldap.v3"
)
const (
// STS API version.
stsAPIVersion = "2011-06-15"
stsVersion = "Version"
stsAction = "Action"
stsPolicy = "Policy"
stsToken = "Token"
stsWebIdentityToken = "WebIdentityToken"
stsDurationSeconds = "DurationSeconds"
stsLDAPUsername = "LDAPUsername"
stsLDAPPassword = "LDAPPassword"
// STS API action constants
clientGrants = "AssumeRoleWithClientGrants"
webIdentity = "AssumeRoleWithWebIdentity"
ldapIdentity = "AssumeRoleWithLDAPIdentity"
assumeRole = "AssumeRole"
stsRequestBodyLimit = 10 * (1 << 20) // 10 MiB
// JWT claim keys
expClaim = "exp"
subClaim = "sub"
// LDAP claim keys
ldapUser = "ldapUser"
ldapGroups = "ldapGroups"
)
// stsAPIHandlers implements and provides http handlers for AWS STS API.
type stsAPIHandlers struct{}
// registerSTSRouter - registers AWS STS compatible APIs.
func registerSTSRouter(router *mux.Router) {
// Initialize STS.
sts := &stsAPIHandlers{}
// STS Router
stsRouter := router.NewRoute().PathPrefix(SlashSeparator).Subrouter()
// Assume roles with no JWT, handles AssumeRole.
stsRouter.Methods(http.MethodPost).MatcherFunc(func(r *http.Request, rm *mux.RouteMatch) bool {
ctypeOk := wildcard.MatchSimple("application/x-www-form-urlencoded*", r.Header.Get(xhttp.ContentType))
authOk := wildcard.MatchSimple(signV4Algorithm+"*", r.Header.Get(xhttp.Authorization))
noQueries := len(r.URL.Query()) == 0
return ctypeOk && authOk && noQueries
}).HandlerFunc(httpTraceAll(sts.AssumeRole))
// Assume roles with JWT handler, handles both ClientGrants and WebIdentity.
stsRouter.Methods(http.MethodPost).MatcherFunc(func(r *http.Request, rm *mux.RouteMatch) bool {
ctypeOk := wildcard.MatchSimple("application/x-www-form-urlencoded*", r.Header.Get(xhttp.ContentType))
noQueries := len(r.URL.Query()) == 0
return ctypeOk && noQueries
}).HandlerFunc(httpTraceAll(sts.AssumeRoleWithJWT))
// AssumeRoleWithClientGrants
stsRouter.Methods(http.MethodPost).HandlerFunc(httpTraceAll(sts.AssumeRoleWithClientGrants)).
Queries(stsAction, clientGrants).
Queries(stsVersion, stsAPIVersion).
Queries(stsToken, "{Token:.*}")
// AssumeRoleWithWebIdentity
stsRouter.Methods(http.MethodPost).HandlerFunc(httpTraceAll(sts.AssumeRoleWithWebIdentity)).
Queries(stsAction, webIdentity).
Queries(stsVersion, stsAPIVersion).
Queries(stsWebIdentityToken, "{Token:.*}")
// AssumeRoleWithLDAPIdentity
stsRouter.Methods(http.MethodPost).HandlerFunc(httpTraceAll(sts.AssumeRoleWithLDAPIdentity)).
Queries(stsAction, ldapIdentity).
Queries(stsVersion, stsAPIVersion).
Queries(stsLDAPUsername, "{LDAPUsername:.*}").
Queries(stsLDAPPassword, "{LDAPPassword:.*}")
}
func checkAssumeRoleAuth(ctx context.Context, r *http.Request) (user auth.Credentials, stsErr STSErrorCode) {
switch getRequestAuthType(r) {
default:
return user, ErrSTSAccessDenied
case authTypeSigned:
s3Err := isReqAuthenticated(ctx, r, globalServerRegion, serviceSTS)
if STSErrorCode(s3Err) != ErrSTSNone {
return user, STSErrorCode(s3Err)
}
var owner bool
user, owner, s3Err = getReqAccessKeyV4(r, globalServerRegion, serviceSTS)
if STSErrorCode(s3Err) != ErrSTSNone {
return user, STSErrorCode(s3Err)
}
// Root credentials are not allowed to use STS API
if owner {
return user, ErrSTSAccessDenied
}
}
// Session tokens are not allowed in STS AssumeRole requests.
if getSessionToken(r) != "" {
return user, ErrSTSAccessDenied
}
return user, ErrSTSNone
}
// AssumeRole - implementation of AWS STS API AssumeRole to get temporary
// credentials for regular users on Minio.
// https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRole.html
func (sts *stsAPIHandlers) AssumeRole(w http.ResponseWriter, r *http.Request) {
ctx := newContext(r, w, "AssumeRole")
user, stsErr := checkAssumeRoleAuth(ctx, r)
if stsErr != ErrSTSNone {
writeSTSErrorResponse(ctx, w, stsErr, nil)
return
}
if err := r.ParseForm(); err != nil {
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, err)
return
}
if r.Form.Get(stsVersion) != stsAPIVersion {
writeSTSErrorResponse(ctx, w, ErrSTSMissingParameter, fmt.Errorf("Invalid STS API version %s, expecting %s", r.Form.Get(stsVersion), stsAPIVersion))
return
}
action := r.Form.Get(stsAction)
switch action {
case assumeRole:
default:
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, fmt.Errorf("Unsupported action %s", action))
return
}
ctx = newContext(r, w, action)
defer logger.AuditLog(w, r, action, nil)
sessionPolicyStr := r.Form.Get(stsPolicy)
// https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRole.html
// The plain text that you use for both inline and managed session
// policies shouldn't exceed 2048 characters.
if len(sessionPolicyStr) > 2048 {
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, fmt.Errorf("Session policy shouldn't exceed 2048 characters"))
return
}
if len(sessionPolicyStr) > 0 {
sessionPolicy, err := iampolicy.ParseConfig(bytes.NewReader([]byte(sessionPolicyStr)))
if err != nil {
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, err)
return
}
// Version in policy must not be empty
if sessionPolicy.Version == "" {
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, fmt.Errorf("Version cannot be empty expecting '2012-10-17'"))
return
}
}
var err error
m := make(map[string]interface{})
m[expClaim], err = openid.GetDefaultExpiration(r.Form.Get(stsDurationSeconds))
if err != nil {
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, err)
return
}
policies, err := globalIAMSys.PolicyDBGet(user.AccessKey, false)
if err != nil {
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, err)
return
}
policyName := ""
if len(policies) > 0 {
policyName = policies[0]
}
// This policy is the policy associated with the user
// requesting for temporary credentials. The temporary
// credentials will inherit the same policy requirements.
m[iamPolicyName()] = policyName
if len(sessionPolicyStr) > 0 {
m[iampolicy.SessionPolicyName] = base64.StdEncoding.EncodeToString([]byte(sessionPolicyStr))
}
secret := globalActiveCred.SecretKey
cred, err := auth.GetNewCredentialsWithMetadata(m, secret)
if err != nil {
writeSTSErrorResponse(ctx, w, ErrSTSInternalError, err)
return
}
// Set the newly generated credentials.
if err = globalIAMSys.SetTempUser(cred.AccessKey, cred, policyName); err != nil {
writeSTSErrorResponse(ctx, w, ErrSTSInternalError, err)
return
}
// Notify all other MinIO peers to reload temp users
for _, nerr := range globalNotificationSys.LoadUser(cred.AccessKey, true) {
if nerr.Err != nil {
logger.GetReqInfo(ctx).SetTags("peerAddress", nerr.Host.String())
logger.LogIf(ctx, nerr.Err)
}
}
assumeRoleResponse := &AssumeRoleResponse{
Result: AssumeRoleResult{
Credentials: cred,
},
}
assumeRoleResponse.ResponseMetadata.RequestID = w.Header().Get(xhttp.AmzRequestID)
writeSuccessResponseXML(w, encodeResponse(assumeRoleResponse))
}
func (sts *stsAPIHandlers) AssumeRoleWithJWT(w http.ResponseWriter, r *http.Request) {
ctx := newContext(r, w, "AssumeRoleJWTCommon")
// Parse the incoming form data.
if err := r.ParseForm(); err != nil {
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, err)
return
}
if r.Form.Get(stsVersion) != stsAPIVersion {
writeSTSErrorResponse(ctx, w, ErrSTSMissingParameter, fmt.Errorf("Invalid STS API version %s, expecting %s", r.Form.Get("Version"), stsAPIVersion))
return
}
action := r.Form.Get(stsAction)
switch action {
case clientGrants, webIdentity:
default:
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, fmt.Errorf("Unsupported action %s", action))
return
}
ctx = newContext(r, w, action)
defer logger.AuditLog(w, r, action, nil)
if globalOpenIDValidators == nil {
writeSTSErrorResponse(ctx, w, ErrSTSNotInitialized, errServerNotInitialized)
return
}
v, err := globalOpenIDValidators.Get("jwt")
if err != nil {
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, err)
return
}
token := r.Form.Get(stsToken)
if token == "" {
token = r.Form.Get(stsWebIdentityToken)
}
m, err := v.Validate(token, r.Form.Get(stsDurationSeconds))
if err != nil {
switch err {
case openid.ErrTokenExpired:
switch action {
case clientGrants:
writeSTSErrorResponse(ctx, w, ErrSTSClientGrantsExpiredToken, err)
case webIdentity:
writeSTSErrorResponse(ctx, w, ErrSTSWebIdentityExpiredToken, err)
}
return
case auth.ErrInvalidDuration:
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, err)
return
}
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, err)
return
}
sessionPolicyStr := r.Form.Get(stsPolicy)
// https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRoleWithWebIdentity.html
// The plain text that you use for both inline and managed session
// policies shouldn't exceed 2048 characters.
if len(sessionPolicyStr) > 2048 {
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, fmt.Errorf("Session policy should not exceed 2048 characters"))
return
}
if len(sessionPolicyStr) > 0 {
sessionPolicy, err := iampolicy.ParseConfig(bytes.NewReader([]byte(sessionPolicyStr)))
if err != nil {
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, err)
return
}
// Version in policy must not be empty
if sessionPolicy.Version == "" {
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, fmt.Errorf("Invalid session policy version"))
return
}
}
if len(sessionPolicyStr) > 0 {
m[iampolicy.SessionPolicyName] = base64.StdEncoding.EncodeToString([]byte(sessionPolicyStr))
}
secret := globalActiveCred.SecretKey
cred, err := auth.GetNewCredentialsWithMetadata(m, secret)
if err != nil {
writeSTSErrorResponse(ctx, w, ErrSTSInternalError, err)
return
}
// JWT has requested a custom claim with policy value set.
// This is a MinIO STS API specific value, this value should
// be set and configured on your identity provider as part of
// JWT custom claims.
var policyName string
if v, ok := m[iamPolicyName()]; ok {
policyName, _ = v.(string)
}
var subFromToken string
if v, ok := m[subClaim]; ok {
subFromToken, _ = v.(string)
}
// Set the newly generated credentials.
if err = globalIAMSys.SetTempUser(cred.AccessKey, cred, policyName); err != nil {
writeSTSErrorResponse(ctx, w, ErrSTSInternalError, err)
return
}
// Notify all other MinIO peers to reload temp users
for _, nerr := range globalNotificationSys.LoadUser(cred.AccessKey, true) {
if nerr.Err != nil {
logger.GetReqInfo(ctx).SetTags("peerAddress", nerr.Host.String())
logger.LogIf(ctx, nerr.Err)
}
}
var encodedSuccessResponse []byte
switch action {
case clientGrants:
clientGrantsResponse := &AssumeRoleWithClientGrantsResponse{
Result: ClientGrantsResult{
Credentials: cred,
SubjectFromToken: subFromToken,
},
}
clientGrantsResponse.ResponseMetadata.RequestID = w.Header().Get(xhttp.AmzRequestID)
encodedSuccessResponse = encodeResponse(clientGrantsResponse)
case webIdentity:
webIdentityResponse := &AssumeRoleWithWebIdentityResponse{
Result: WebIdentityResult{
Credentials: cred,
SubjectFromWebIdentityToken: subFromToken,
},
}
webIdentityResponse.ResponseMetadata.RequestID = w.Header().Get(xhttp.AmzRequestID)
encodedSuccessResponse = encodeResponse(webIdentityResponse)
}
writeSuccessResponseXML(w, encodedSuccessResponse)
}
// AssumeRoleWithWebIdentity - implementation of AWS STS API supporting OAuth2.0
// users from web identity provider such as Facebook, Google, or any OpenID
// Connect-compatible identity provider.
//
// Eg:-
// $ curl https://minio:9000/?Action=AssumeRoleWithWebIdentity&WebIdentityToken=<jwt>
func (sts *stsAPIHandlers) AssumeRoleWithWebIdentity(w http.ResponseWriter, r *http.Request) {
sts.AssumeRoleWithJWT(w, r)
}
// AssumeRoleWithClientGrants - implementation of AWS STS extension API supporting
// OAuth2.0 client credential grants.
//
// Eg:-
// $ curl https://minio:9000/?Action=AssumeRoleWithClientGrants&Token=<jwt>
func (sts *stsAPIHandlers) AssumeRoleWithClientGrants(w http.ResponseWriter, r *http.Request) {
sts.AssumeRoleWithJWT(w, r)
}
// AssumeRoleWithLDAPIdentity - implements user auth against LDAP server
func (sts *stsAPIHandlers) AssumeRoleWithLDAPIdentity(w http.ResponseWriter, r *http.Request) {
ctx := newContext(r, w, "AssumeRoleWithLDAPIdentity")
// Parse the incoming form data.
if err := r.ParseForm(); err != nil {
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, err)
return
}
if r.Form.Get(stsVersion) != stsAPIVersion {
writeSTSErrorResponse(ctx, w, ErrSTSMissingParameter, fmt.Errorf("Invalid STS API version %s, expecting %s", r.Form.Get("Version"), stsAPIVersion))
return
}
action := r.Form.Get(stsAction)
switch action {
case ldapIdentity:
default:
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, fmt.Errorf("Unsupported action %s", action))
return
}
ctx = newContext(r, w, action)
defer logger.AuditLog(w, r, action, nil)
ldapUsername := r.Form.Get(stsLDAPUsername)
ldapPassword := r.Form.Get(stsLDAPPassword)
if ldapUsername == "" || ldapPassword == "" {
writeSTSErrorResponse(ctx, w, ErrSTSMissingParameter, fmt.Errorf("LDAPUsername and LDAPPassword cannot be empty"))
return
}
sessionPolicyStr := r.Form.Get(stsPolicy)
// https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRole.html
// The plain text that you use for both inline and managed session
// policies shouldn't exceed 2048 characters.
if len(sessionPolicyStr) > 2048 {
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, fmt.Errorf("Session policy should not exceed 2048 characters"))
return
}
if len(sessionPolicyStr) > 0 {
sessionPolicy, err := iampolicy.ParseConfig(bytes.NewReader([]byte(sessionPolicyStr)))
if err != nil {
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, err)
return
}
// Version in policy must not be empty
if sessionPolicy.Version == "" {
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, fmt.Errorf("Version needs to be specified in session policy"))
return
}
}
ldapConn, err := globalLDAPConfig.Connect()
if err != nil {
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, fmt.Errorf("LDAP server connection failure: %w", err))
return
}
if ldapConn == nil {
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, fmt.Errorf("LDAP server not configured: %w", err))
return
}
// Close ldap connection to avoid leaks.
defer ldapConn.Close()
usernameSubs, _ := xldap.NewSubstituter("username", ldapUsername)
// We ignore error below as we already validated the username
// format string at startup.
usernameDN, _ := usernameSubs.Substitute(globalLDAPConfig.UsernameFormat)
// Bind with user credentials to validate the password
if err = ldapConn.Bind(usernameDN, ldapPassword); err != nil {
err = fmt.Errorf("LDAP authentication failure: %w", err)
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, err)
return
}
groups := []string{}
if globalLDAPConfig.GroupSearchFilter != "" {
// Verified user credentials. Now we find the groups they are
// a member of.
searchSubs, _ := xldap.NewSubstituter(
"username", ldapUsername,
"usernamedn", usernameDN,
)
// We ignore error below as we already validated the search string
// at startup.
groupSearchFilter, _ := searchSubs.Substitute(globalLDAPConfig.GroupSearchFilter)
baseDN, _ := searchSubs.Substitute(globalLDAPConfig.GroupSearchBaseDN)
searchRequest := ldap.NewSearchRequest(
baseDN,
ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false,
groupSearchFilter,
[]string{globalLDAPConfig.GroupNameAttribute},
nil,
)
sr, err := ldapConn.Search(searchRequest)
if err != nil {
writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, fmt.Errorf("LDAP search failure: %w", err))
return
}
for _, entry := range sr.Entries {
// We only queried one attribute, so we only look up
// the first one.
groups = append(groups, entry.Attributes[0].Values...)
}
}
expiryDur := globalLDAPConfig.GetExpiryDuration()
m := map[string]interface{}{
expClaim: UTCNow().Add(expiryDur).Unix(),
ldapUser: ldapUsername,
ldapGroups: groups,
}
if len(sessionPolicyStr) > 0 {
m[iampolicy.SessionPolicyName] = base64.StdEncoding.EncodeToString([]byte(sessionPolicyStr))
}
secret := globalActiveCred.SecretKey
cred, err := auth.GetNewCredentialsWithMetadata(m, secret)
if err != nil {
writeSTSErrorResponse(ctx, w, ErrSTSInternalError, err)
return
}
policyName := ""
// Set the newly generated credentials.
if err = globalIAMSys.SetTempUser(cred.AccessKey, cred, policyName); err != nil {
writeSTSErrorResponse(ctx, w, ErrSTSInternalError, err)
return
}
// Notify all other MinIO peers to reload temp users
for _, nerr := range globalNotificationSys.LoadUser(cred.AccessKey, true) {
if nerr.Err != nil {
logger.GetReqInfo(ctx).SetTags("peerAddress", nerr.Host.String())
logger.LogIf(ctx, nerr.Err)
}
}
ldapIdentityResponse := &AssumeRoleWithLDAPResponse{
Result: LDAPIdentityResult{
Credentials: cred,
},
}
ldapIdentityResponse.ResponseMetadata.RequestID = w.Header().Get(xhttp.AmzRequestID)
encodedSuccessResponse := encodeResponse(ldapIdentityResponse)
writeSuccessResponseXML(w, encodedSuccessResponse)
}