Fixes support for using multiple base DNs for user search in the LDAP directory allowing users from different subtrees in the LDAP hierarchy to request credentials. - The username in the produced credentials is now the full DN of the LDAP user to disambiguate users in different base DNs.
551 lines
18 KiB
Go
551 lines
18 KiB
Go
/*
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* MinIO Cloud Storage, (C) 2018-2020 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 cmd
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import (
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"bytes"
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"context"
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"encoding/base64"
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"fmt"
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"net/http"
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"strings"
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"github.com/gorilla/mux"
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"github.com/minio/minio/cmd/config/identity/openid"
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xhttp "github.com/minio/minio/cmd/http"
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"github.com/minio/minio/cmd/logger"
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"github.com/minio/minio/pkg/auth"
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iampolicy "github.com/minio/minio/pkg/iam/policy"
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"github.com/minio/minio/pkg/wildcard"
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)
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const (
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// STS API version.
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stsAPIVersion = "2011-06-15"
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stsVersion = "Version"
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stsAction = "Action"
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stsPolicy = "Policy"
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stsToken = "Token"
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stsWebIdentityToken = "WebIdentityToken"
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stsDurationSeconds = "DurationSeconds"
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stsLDAPUsername = "LDAPUsername"
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stsLDAPPassword = "LDAPPassword"
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// STS API action constants
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clientGrants = "AssumeRoleWithClientGrants"
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webIdentity = "AssumeRoleWithWebIdentity"
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ldapIdentity = "AssumeRoleWithLDAPIdentity"
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assumeRole = "AssumeRole"
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stsRequestBodyLimit = 10 * (1 << 20) // 10 MiB
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// JWT claim keys
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expClaim = "exp"
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subClaim = "sub"
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// JWT claim to check the parent user
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parentClaim = "parent"
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// LDAP claim keys
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ldapUser = "ldapUser"
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)
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// stsAPIHandlers implements and provides http handlers for AWS STS API.
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type stsAPIHandlers struct{}
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// registerSTSRouter - registers AWS STS compatible APIs.
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func registerSTSRouter(router *mux.Router) {
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// Initialize STS.
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sts := &stsAPIHandlers{}
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// STS Router
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stsRouter := router.NewRoute().PathPrefix(SlashSeparator).Subrouter()
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// Assume roles with no JWT, handles AssumeRole.
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stsRouter.Methods(http.MethodPost).MatcherFunc(func(r *http.Request, rm *mux.RouteMatch) bool {
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ctypeOk := wildcard.MatchSimple("application/x-www-form-urlencoded*", r.Header.Get(xhttp.ContentType))
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authOk := wildcard.MatchSimple(signV4Algorithm+"*", r.Header.Get(xhttp.Authorization))
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noQueries := len(r.URL.Query()) == 0
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return ctypeOk && authOk && noQueries
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}).HandlerFunc(httpTraceAll(sts.AssumeRole))
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// Assume roles with JWT handler, handles both ClientGrants and WebIdentity.
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stsRouter.Methods(http.MethodPost).MatcherFunc(func(r *http.Request, rm *mux.RouteMatch) bool {
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ctypeOk := wildcard.MatchSimple("application/x-www-form-urlencoded*", r.Header.Get(xhttp.ContentType))
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noQueries := len(r.URL.Query()) == 0
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return ctypeOk && noQueries
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}).HandlerFunc(httpTraceAll(sts.AssumeRoleWithSSO))
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// AssumeRoleWithClientGrants
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stsRouter.Methods(http.MethodPost).HandlerFunc(httpTraceAll(sts.AssumeRoleWithClientGrants)).
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Queries(stsAction, clientGrants).
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Queries(stsVersion, stsAPIVersion).
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Queries(stsToken, "{Token:.*}")
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// AssumeRoleWithWebIdentity
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stsRouter.Methods(http.MethodPost).HandlerFunc(httpTraceAll(sts.AssumeRoleWithWebIdentity)).
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Queries(stsAction, webIdentity).
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Queries(stsVersion, stsAPIVersion).
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Queries(stsWebIdentityToken, "{Token:.*}")
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// AssumeRoleWithLDAPIdentity
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stsRouter.Methods(http.MethodPost).HandlerFunc(httpTraceAll(sts.AssumeRoleWithLDAPIdentity)).
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Queries(stsAction, ldapIdentity).
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Queries(stsVersion, stsAPIVersion).
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Queries(stsLDAPUsername, "{LDAPUsername:.*}").
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Queries(stsLDAPPassword, "{LDAPPassword:.*}")
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}
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func checkAssumeRoleAuth(ctx context.Context, r *http.Request) (user auth.Credentials, isErrCodeSTS bool, stsErr STSErrorCode) {
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switch getRequestAuthType(r) {
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default:
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return user, true, ErrSTSAccessDenied
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case authTypeSigned:
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s3Err := isReqAuthenticated(ctx, r, globalServerRegion, serviceSTS)
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if APIErrorCode(s3Err) != ErrNone {
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return user, false, STSErrorCode(s3Err)
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}
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var owner bool
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user, owner, s3Err = getReqAccessKeyV4(r, globalServerRegion, serviceSTS)
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if APIErrorCode(s3Err) != ErrNone {
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return user, false, STSErrorCode(s3Err)
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}
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// Root credentials are not allowed to use STS API
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if owner {
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return user, true, ErrSTSAccessDenied
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}
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}
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// Session tokens are not allowed in STS AssumeRole requests.
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if getSessionToken(r) != "" {
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return user, true, ErrSTSAccessDenied
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}
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// Temporary credentials or Service accounts cannot generate further temporary credentials.
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if user.IsTemp() || user.IsServiceAccount() {
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return user, true, ErrSTSAccessDenied
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}
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return user, true, ErrSTSNone
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}
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// AssumeRole - implementation of AWS STS API AssumeRole to get temporary
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// credentials for regular users on Minio.
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// https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRole.html
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func (sts *stsAPIHandlers) AssumeRole(w http.ResponseWriter, r *http.Request) {
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ctx := newContext(r, w, "AssumeRole")
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user, isErrCodeSTS, stsErr := checkAssumeRoleAuth(ctx, r)
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if stsErr != ErrSTSNone {
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writeSTSErrorResponse(ctx, w, isErrCodeSTS, stsErr, nil)
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return
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}
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if err := r.ParseForm(); err != nil {
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writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, err)
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return
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}
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if r.Form.Get(stsVersion) != stsAPIVersion {
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writeSTSErrorResponse(ctx, w, true, ErrSTSMissingParameter, fmt.Errorf("Invalid STS API version %s, expecting %s", r.Form.Get(stsVersion), stsAPIVersion))
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return
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}
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action := r.Form.Get(stsAction)
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switch action {
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case assumeRole:
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default:
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writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, fmt.Errorf("Unsupported action %s", action))
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return
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}
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ctx = newContext(r, w, action)
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defer logger.AuditLog(w, r, action, nil)
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sessionPolicyStr := r.Form.Get(stsPolicy)
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// https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRole.html
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// The plain text that you use for both inline and managed session
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// policies shouldn't exceed 2048 characters.
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if len(sessionPolicyStr) > 2048 {
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writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, fmt.Errorf("Session policy shouldn't exceed 2048 characters"))
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return
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}
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if len(sessionPolicyStr) > 0 {
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sessionPolicy, err := iampolicy.ParseConfig(bytes.NewReader([]byte(sessionPolicyStr)))
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if err != nil {
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writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, err)
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return
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}
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// Version in policy must not be empty
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if sessionPolicy.Version == "" {
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writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, fmt.Errorf("Version cannot be empty expecting '2012-10-17'"))
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return
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}
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}
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var err error
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m := make(map[string]interface{})
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m[expClaim], err = openid.GetDefaultExpiration(r.Form.Get(stsDurationSeconds))
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if err != nil {
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writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, err)
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return
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}
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policies, err := globalIAMSys.PolicyDBGet(user.AccessKey, false)
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if err != nil {
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writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, err)
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return
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}
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policyName := strings.Join(policies, ",")
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// This policy is the policy associated with the user
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// requesting for temporary credentials. The temporary
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// credentials will inherit the same policy requirements.
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m[iamPolicyClaimNameOpenID()] = policyName
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if len(sessionPolicyStr) > 0 {
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m[iampolicy.SessionPolicyName] = base64.StdEncoding.EncodeToString([]byte(sessionPolicyStr))
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}
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secret := globalActiveCred.SecretKey
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cred, err := auth.GetNewCredentialsWithMetadata(m, secret)
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if err != nil {
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writeSTSErrorResponse(ctx, w, true, ErrSTSInternalError, err)
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return
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}
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// Set the parent of the temporary access key, this is useful
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// in obtaining service accounts by this cred.
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cred.ParentUser = user.AccessKey
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// Set the newly generated credentials.
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if err = globalIAMSys.SetTempUser(cred.AccessKey, cred, policyName); err != nil {
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writeSTSErrorResponse(ctx, w, true, ErrSTSInternalError, err)
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return
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}
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// Notify all other MinIO peers to reload temp users
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for _, nerr := range globalNotificationSys.LoadUser(cred.AccessKey, true) {
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if nerr.Err != nil {
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logger.GetReqInfo(ctx).SetTags("peerAddress", nerr.Host.String())
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logger.LogIf(ctx, nerr.Err)
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}
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}
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assumeRoleResponse := &AssumeRoleResponse{
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Result: AssumeRoleResult{
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Credentials: cred,
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},
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}
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assumeRoleResponse.ResponseMetadata.RequestID = w.Header().Get(xhttp.AmzRequestID)
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writeSuccessResponseXML(w, encodeResponse(assumeRoleResponse))
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}
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func (sts *stsAPIHandlers) AssumeRoleWithSSO(w http.ResponseWriter, r *http.Request) {
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ctx := newContext(r, w, "AssumeRoleSSOCommon")
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// Parse the incoming form data.
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if err := r.ParseForm(); err != nil {
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writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, err)
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return
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}
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if r.Form.Get(stsVersion) != stsAPIVersion {
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writeSTSErrorResponse(ctx, w, true, ErrSTSMissingParameter, fmt.Errorf("Invalid STS API version %s, expecting %s", r.Form.Get("Version"), stsAPIVersion))
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return
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}
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action := r.Form.Get(stsAction)
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switch action {
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case ldapIdentity:
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sts.AssumeRoleWithLDAPIdentity(w, r)
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return
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case clientGrants, webIdentity:
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default:
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writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, fmt.Errorf("Unsupported action %s", action))
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return
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}
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ctx = newContext(r, w, action)
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defer logger.AuditLog(w, r, action, nil)
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if globalOpenIDValidators == nil {
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writeSTSErrorResponse(ctx, w, true, ErrSTSNotInitialized, errServerNotInitialized)
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return
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}
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v, err := globalOpenIDValidators.Get("jwt")
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if err != nil {
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writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, err)
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return
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}
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token := r.Form.Get(stsToken)
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if token == "" {
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token = r.Form.Get(stsWebIdentityToken)
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}
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m, err := v.Validate(token, r.Form.Get(stsDurationSeconds))
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if err != nil {
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switch err {
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case openid.ErrTokenExpired:
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switch action {
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case clientGrants:
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writeSTSErrorResponse(ctx, w, true, ErrSTSClientGrantsExpiredToken, err)
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case webIdentity:
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writeSTSErrorResponse(ctx, w, true, ErrSTSWebIdentityExpiredToken, err)
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}
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return
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case auth.ErrInvalidDuration:
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writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, err)
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return
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}
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writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, err)
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return
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}
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// JWT has requested a custom claim with policy value set.
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// This is a MinIO STS API specific value, this value should
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// be set and configured on your identity provider as part of
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// JWT custom claims.
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var policyName string
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policySet, ok := iampolicy.GetPoliciesFromClaims(m, iamPolicyClaimNameOpenID())
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if ok {
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policyName = globalIAMSys.CurrentPolicies(strings.Join(policySet.ToSlice(), ","))
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}
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if policyName == "" && globalPolicyOPA == nil {
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writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue,
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fmt.Errorf("%s claim missing from the JWT token, credentials will not be generated", iamPolicyClaimNameOpenID()))
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return
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}
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m[iamPolicyClaimNameOpenID()] = policyName
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sessionPolicyStr := r.Form.Get(stsPolicy)
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// https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRoleWithWebIdentity.html
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// The plain text that you use for both inline and managed session
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// policies shouldn't exceed 2048 characters.
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if len(sessionPolicyStr) > 2048 {
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writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, fmt.Errorf("Session policy should not exceed 2048 characters"))
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return
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}
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if len(sessionPolicyStr) > 0 {
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sessionPolicy, err := iampolicy.ParseConfig(bytes.NewReader([]byte(sessionPolicyStr)))
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if err != nil {
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writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, err)
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return
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}
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// Version in policy must not be empty
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if sessionPolicy.Version == "" {
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writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, fmt.Errorf("Invalid session policy version"))
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return
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}
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m[iampolicy.SessionPolicyName] = base64.StdEncoding.EncodeToString([]byte(sessionPolicyStr))
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}
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secret := globalActiveCred.SecretKey
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cred, err := auth.GetNewCredentialsWithMetadata(m, secret)
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if err != nil {
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writeSTSErrorResponse(ctx, w, true, ErrSTSInternalError, err)
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return
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}
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var subFromToken string
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if v, ok := m[subClaim]; ok {
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subFromToken, _ = v.(string)
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}
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// Set the newly generated credentials.
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if err = globalIAMSys.SetTempUser(cred.AccessKey, cred, policyName); err != nil {
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writeSTSErrorResponse(ctx, w, true, ErrSTSInternalError, err)
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return
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}
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// Notify all other MinIO peers to reload temp users
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for _, nerr := range globalNotificationSys.LoadUser(cred.AccessKey, true) {
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if nerr.Err != nil {
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logger.GetReqInfo(ctx).SetTags("peerAddress", nerr.Host.String())
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logger.LogIf(ctx, nerr.Err)
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}
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}
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var encodedSuccessResponse []byte
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switch action {
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case clientGrants:
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clientGrantsResponse := &AssumeRoleWithClientGrantsResponse{
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Result: ClientGrantsResult{
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Credentials: cred,
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SubjectFromToken: subFromToken,
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},
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}
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clientGrantsResponse.ResponseMetadata.RequestID = w.Header().Get(xhttp.AmzRequestID)
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encodedSuccessResponse = encodeResponse(clientGrantsResponse)
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case webIdentity:
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webIdentityResponse := &AssumeRoleWithWebIdentityResponse{
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Result: WebIdentityResult{
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Credentials: cred,
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SubjectFromWebIdentityToken: subFromToken,
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},
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}
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webIdentityResponse.ResponseMetadata.RequestID = w.Header().Get(xhttp.AmzRequestID)
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encodedSuccessResponse = encodeResponse(webIdentityResponse)
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}
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writeSuccessResponseXML(w, encodedSuccessResponse)
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}
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// AssumeRoleWithWebIdentity - implementation of AWS STS API supporting OAuth2.0
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// users from web identity provider such as Facebook, Google, or any OpenID
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// Connect-compatible identity provider.
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//
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// Eg:-
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// $ curl https://minio:9000/?Action=AssumeRoleWithWebIdentity&WebIdentityToken=<jwt>
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func (sts *stsAPIHandlers) AssumeRoleWithWebIdentity(w http.ResponseWriter, r *http.Request) {
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sts.AssumeRoleWithSSO(w, r)
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}
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// AssumeRoleWithClientGrants - implementation of AWS STS extension API supporting
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// OAuth2.0 client credential grants.
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//
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// Eg:-
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// $ curl https://minio:9000/?Action=AssumeRoleWithClientGrants&Token=<jwt>
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func (sts *stsAPIHandlers) AssumeRoleWithClientGrants(w http.ResponseWriter, r *http.Request) {
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sts.AssumeRoleWithSSO(w, r)
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}
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// AssumeRoleWithLDAPIdentity - implements user auth against LDAP server
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func (sts *stsAPIHandlers) AssumeRoleWithLDAPIdentity(w http.ResponseWriter, r *http.Request) {
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ctx := newContext(r, w, "AssumeRoleWithLDAPIdentity")
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defer logger.AuditLog(w, r, "AssumeRoleWithLDAPIdentity", nil, stsLDAPPassword)
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// Parse the incoming form data.
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if err := r.ParseForm(); err != nil {
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writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, err)
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return
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}
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if r.Form.Get(stsVersion) != stsAPIVersion {
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writeSTSErrorResponse(ctx, w, true, ErrSTSMissingParameter,
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fmt.Errorf("Invalid STS API version %s, expecting %s", r.Form.Get("Version"), stsAPIVersion))
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return
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}
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ldapUsername := r.Form.Get(stsLDAPUsername)
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ldapPassword := r.Form.Get(stsLDAPPassword)
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if ldapUsername == "" || ldapPassword == "" {
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writeSTSErrorResponse(ctx, w, true, ErrSTSMissingParameter, fmt.Errorf("LDAPUsername and LDAPPassword cannot be empty"))
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return
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}
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action := r.Form.Get(stsAction)
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switch action {
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case ldapIdentity:
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default:
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writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, fmt.Errorf("Unsupported action %s", action))
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return
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}
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sessionPolicyStr := r.Form.Get(stsPolicy)
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// https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRole.html
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// The plain text that you use for both inline and managed session
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// policies shouldn't exceed 2048 characters.
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if len(sessionPolicyStr) > 2048 {
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writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, fmt.Errorf("Session policy should not exceed 2048 characters"))
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return
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}
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if len(sessionPolicyStr) > 0 {
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sessionPolicy, err := iampolicy.ParseConfig(bytes.NewReader([]byte(sessionPolicyStr)))
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if err != nil {
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writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, err)
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return
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}
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|
// Version in policy must not be empty
|
|
if sessionPolicy.Version == "" {
|
|
writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, fmt.Errorf("Version needs to be specified in session policy"))
|
|
return
|
|
}
|
|
}
|
|
|
|
ldapUserDN, groups, err := globalLDAPConfig.Bind(ldapUsername, ldapPassword)
|
|
if err != nil {
|
|
err = fmt.Errorf("LDAP server error: %w", err)
|
|
writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, err)
|
|
return
|
|
}
|
|
|
|
expiryDur := globalLDAPConfig.GetExpiryDuration()
|
|
m := map[string]interface{}{
|
|
expClaim: UTCNow().Add(expiryDur).Unix(),
|
|
ldapUser: ldapUserDN,
|
|
}
|
|
|
|
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, true, ErrSTSInternalError, err)
|
|
return
|
|
}
|
|
|
|
// Set the parent of the temporary access key, this is useful
|
|
// in obtaining service accounts by this cred.
|
|
cred.ParentUser = ldapUserDN
|
|
|
|
// Set this value to LDAP groups, LDAP user can be part
|
|
// of large number of groups
|
|
cred.Groups = groups
|
|
|
|
// Set the newly generated credentials, policyName is empty on purpose
|
|
// LDAP policies are applied automatically using their ldapUser, ldapGroups
|
|
// mapping.
|
|
if err = globalIAMSys.SetTempUser(cred.AccessKey, cred, ""); err != nil {
|
|
writeSTSErrorResponse(ctx, w, true, 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)
|
|
}
|