a0456ce940
Add LDAP based users-groups system This change adds support to integrate an LDAP server for user authentication. This works via a custom STS API for LDAP. Each user accessing the MinIO who can be authenticated via LDAP receives temporary credentials to access the MinIO server. LDAP is enabled only over TLS. User groups are also supported via LDAP. The administrator may configure an LDAP search query to find the group attribute of a user - this may correspond to any attribute in the LDAP tree (that the user has access to view). One or more groups may be returned by such a query. A group is mapped to an IAM policy in the usual way, and the server enforces a policy corresponding to all the groups and the user's own mapped policy. When LDAP is configured, the internal MinIO users system is disabled.
561 lines
18 KiB
Go
561 lines
18 KiB
Go
/*
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* MinIO Cloud Storage, (C) 2018, 2019 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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"github.com/gorilla/mux"
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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/iam/validator"
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"github.com/minio/minio/pkg/wildcard"
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ldap "gopkg.in/ldap.v3"
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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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// 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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// LDAP claim keys
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ldapUser = "ldapUser"
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ldapGroups = "ldapGroups"
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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("POST").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.AssumeRoleWithJWT))
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// AssumeRoleWithClientGrants
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stsRouter.Methods("POST").HandlerFunc(httpTraceAll(sts.AssumeRoleWithClientGrants)).
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Queries("Action", clientGrants).
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Queries("Version", stsAPIVersion).
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Queries("Token", "{Token:.*}")
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// AssumeRoleWithWebIdentity
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stsRouter.Methods("POST").HandlerFunc(httpTraceAll(sts.AssumeRoleWithWebIdentity)).
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Queries("Action", webIdentity).
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Queries("Version", stsAPIVersion).
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Queries("WebIdentityToken", "{Token:.*}")
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// AssumeRoleWithLDAPIdentity
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stsRouter.Methods("POST").HandlerFunc(httpTraceAll(sts.AssumeRoleWithLDAPIdentity)).
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Queries("Action", ldapIdentity).
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Queries("Version", stsAPIVersion).
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Queries("LDAPUsername", "{LDAPUsername:.*}").
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Queries("LDAPPassword", "{LDAPPassword:.*}")
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}
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func checkAssumeRoleAuth(ctx context.Context, r *http.Request) (user auth.Credentials, stsErr STSErrorCode) {
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switch getRequestAuthType(r) {
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default:
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return user, ErrSTSAccessDenied
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case authTypeSigned:
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s3Err := isReqAuthenticated(ctx, r, globalServerConfig.GetRegion(), serviceSTS)
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if STSErrorCode(s3Err) != ErrSTSNone {
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return user, STSErrorCode(s3Err)
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}
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var owner bool
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user, owner, s3Err = getReqAccessKeyV4(r, globalServerConfig.GetRegion(), serviceSTS)
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if STSErrorCode(s3Err) != ErrSTSNone {
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return user, 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, 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, ErrSTSAccessDenied
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}
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return user, 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, stsErr := checkAssumeRoleAuth(ctx, r)
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if stsErr != ErrSTSNone {
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(stsErr))
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return
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}
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if err := r.ParseForm(); err != nil {
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logger.LogIf(ctx, err)
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
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return
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}
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if r.Form.Get("Version") != stsAPIVersion {
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logger.LogIf(ctx, fmt.Errorf("Invalid STS API version %s, expecting %s", r.Form.Get("Version"), stsAPIVersion))
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSMissingParameter))
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return
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}
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action := r.Form.Get("Action")
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switch action {
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case assumeRole:
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default:
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logger.LogIf(ctx, fmt.Errorf("Unsupported action %s", action))
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
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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("Policy")
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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(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
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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(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
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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(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
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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["exp"], err = validator.GetDefaultExpiration(r.Form.Get("DurationSeconds"))
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if err != nil {
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switch err {
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case validator.ErrInvalidDuration:
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
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default:
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logger.LogIf(ctx, err)
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
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}
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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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logger.LogIf(ctx, err)
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
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return
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}
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policyName := ""
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if len(policies) > 0 {
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policyName = policies[0]
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}
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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[iampolicy.PolicyName] = 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 := globalServerConfig.GetCredential().SecretKey
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cred, err := auth.GetNewCredentialsWithMetadata(m, secret)
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if err != nil {
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logger.LogIf(ctx, err)
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInternalError))
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return
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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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logger.LogIf(ctx, err)
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInternalError))
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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) AssumeRoleWithJWT(w http.ResponseWriter, r *http.Request) {
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ctx := newContext(r, w, "AssumeRoleJWTCommon")
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// Parse the incoming form data.
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if err := r.ParseForm(); err != nil {
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logger.LogIf(ctx, err)
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
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return
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}
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if r.Form.Get("Version") != stsAPIVersion {
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logger.LogIf(ctx, fmt.Errorf("Invalid STS API version %s, expecting %s", r.Form.Get("Version"), stsAPIVersion))
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSMissingParameter))
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return
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}
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action := r.Form.Get("Action")
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switch action {
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case clientGrants, webIdentity:
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default:
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logger.LogIf(ctx, fmt.Errorf("Unsupported action %s", action))
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
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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 globalIAMValidators == nil {
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSNotInitialized))
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return
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}
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v, err := globalIAMValidators.Get("jwt")
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if err != nil {
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logger.LogIf(ctx, err)
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
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return
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}
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token := r.Form.Get("Token")
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if token == "" {
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token = r.Form.Get("WebIdentityToken")
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}
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m, err := v.Validate(token, r.Form.Get("DurationSeconds"))
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if err != nil {
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switch err {
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case validator.ErrTokenExpired:
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switch action {
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case clientGrants:
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSClientGrantsExpiredToken))
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case webIdentity:
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSWebIdentityExpiredToken))
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}
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return
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case validator.ErrInvalidDuration:
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
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return
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}
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logger.LogIf(ctx, err)
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
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return
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}
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sessionPolicyStr := r.Form.Get("Policy")
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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(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
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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(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
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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(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
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return
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}
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}
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secret := globalServerConfig.GetCredential().SecretKey
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cred, err := auth.GetNewCredentialsWithMetadata(m, secret)
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if err != nil {
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logger.LogIf(ctx, err)
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInternalError))
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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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if v, ok := m[iampolicy.PolicyName]; ok {
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policyName, _ = v.(string)
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}
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var subFromToken string
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if v, ok := m["sub"]; ok {
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subFromToken, _ = v.(string)
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}
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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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// Set the newly generated credentials.
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if err = globalIAMSys.SetTempUser(cred.AccessKey, cred, policyName); err != nil {
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logger.LogIf(ctx, err)
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInternalError))
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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.AssumeRoleWithJWT(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.AssumeRoleWithJWT(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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// Parse the incoming form data.
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if err := r.ParseForm(); err != nil {
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logger.LogIf(ctx, err)
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
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return
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}
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if r.Form.Get("Version") != stsAPIVersion {
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logger.LogIf(ctx, fmt.Errorf("Invalid STS API version %s, expecting %s", r.Form.Get("Version"), stsAPIVersion))
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSMissingParameter))
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return
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}
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action := r.Form.Get("Action")
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switch action {
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case ldapIdentity:
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default:
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logger.LogIf(ctx, fmt.Errorf("Unsupported action %s", action))
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
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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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ldapUsername := r.Form.Get("LDAPUsername")
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ldapPassword := r.Form.Get("LDAPPassword")
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if ldapUsername == "" || ldapPassword == "" {
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSMissingParameter))
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return
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}
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ldapConn, err := globalServerConfig.LDAPServerConfig.Connect()
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if err != nil {
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logger.LogIf(ctx, fmt.Errorf("LDAP server connection failure: %v", err))
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
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return
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}
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if ldapConn == nil {
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logger.LogIf(ctx, fmt.Errorf("LDAP server not configured: %v", err))
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writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
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return
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}
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usernameSubs := newSubstituter("username", ldapUsername)
|
|
// We ignore error below as we already validated the username
|
|
// format string at startup.
|
|
usernameDN, _ := usernameSubs.substitute(globalServerConfig.LDAPServerConfig.UsernameFormat)
|
|
// Bind with user credentials to validate the password
|
|
err = ldapConn.Bind(usernameDN, ldapPassword)
|
|
if err != nil {
|
|
logger.LogIf(ctx, fmt.Errorf("LDAP authentication failure: %v", err))
|
|
writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
|
|
return
|
|
}
|
|
|
|
groups := []string{}
|
|
if globalServerConfig.LDAPServerConfig.GroupSearchFilter != "" {
|
|
// Verified user credentials. Now we find the groups they are
|
|
// a member of.
|
|
searchSubs := newSubstituter(
|
|
"username", ldapUsername,
|
|
"usernamedn", usernameDN,
|
|
)
|
|
// We ignore error below as we already validated the search string
|
|
// at startup.
|
|
groupSearchFilter, _ := searchSubs.substitute(globalServerConfig.LDAPServerConfig.GroupSearchFilter)
|
|
baseDN, _ := searchSubs.substitute(globalServerConfig.LDAPServerConfig.GroupSearchBaseDN)
|
|
searchRequest := ldap.NewSearchRequest(
|
|
baseDN,
|
|
ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false,
|
|
groupSearchFilter,
|
|
[]string{globalServerConfig.LDAPServerConfig.GroupNameAttribute},
|
|
nil,
|
|
)
|
|
|
|
sr, err := ldapConn.Search(searchRequest)
|
|
if err != nil {
|
|
logger.LogIf(ctx, fmt.Errorf("LDAP search failure: %v", err))
|
|
writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
|
|
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 := globalServerConfig.LDAPServerConfig.stsExpiryDuration
|
|
m := map[string]interface{}{
|
|
"exp": UTCNow().Add(expiryDur).Unix(),
|
|
"ldapUser": ldapUsername,
|
|
"ldapGroups": groups,
|
|
}
|
|
|
|
secret := globalServerConfig.GetCredential().SecretKey
|
|
cred, err := auth.GetNewCredentialsWithMetadata(m, secret)
|
|
if err != nil {
|
|
logger.LogIf(ctx, err)
|
|
writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInternalError))
|
|
return
|
|
}
|
|
|
|
policyName := ""
|
|
// Set the newly generated credentials.
|
|
if err = globalIAMSys.SetTempUser(cred.AccessKey, cred, policyName); err != nil {
|
|
logger.LogIf(ctx, err)
|
|
writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInternalError))
|
|
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)
|
|
}
|