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77dc2031a2
This PR additionally also adds support for missing - Session policy support for AD/LDAP - Add API request/response parameters detail - Update example to take ldap username, password input from the command line - Fixes session policy handling for ClientGrants and WebIdentity
588 lines
19 KiB
Go
588 lines
19 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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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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// 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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// 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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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))
|
|
return
|
|
}
|
|
}
|
|
|
|
ldapConn, err := globalServerConfig.LDAPServerConfig.Connect()
|
|
if err != nil {
|
|
logger.LogIf(ctx, fmt.Errorf("LDAP server connection failure: %v", err))
|
|
writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
|
|
return
|
|
}
|
|
if ldapConn == nil {
|
|
logger.LogIf(ctx, fmt.Errorf("LDAP server not configured: %v", err))
|
|
writeSTSErrorResponse(w, stsErrCodes.ToSTSErr(ErrSTSInvalidParameterValue))
|
|
return
|
|
}
|
|
|
|
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,
|
|
}
|
|
|
|
if len(sessionPolicyStr) > 0 {
|
|
m[iampolicy.SessionPolicyName] = base64.StdEncoding.EncodeToString([]byte(sessionPolicyStr))
|
|
}
|
|
|
|
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)
|
|
}
|