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dc6958b6a1
The error implies an expected claim is missing even when the claim is present. Added an additional error message to clarify the problem.
586 lines
19 KiB
Go
586 lines
19 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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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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"errors"
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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/internal/auth"
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"github.com/minio/minio/internal/config/identity/openid"
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xhttp "github.com/minio/minio/internal/http"
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"github.com/minio/minio/internal/logger"
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iampolicy "github.com/minio/pkg/iam/policy"
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"github.com/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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issClaim = "iss"
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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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ldapUsername = "ldapUsername"
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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 s3Err != ErrNone {
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return user, false, STSErrorCode(s3Err)
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}
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user, _, s3Err = getReqAccessKeyV4(r, globalServerRegion, serviceSTS)
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if s3Err != ErrNone {
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return user, false, STSErrorCode(s3Err)
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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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}
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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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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(ctx, w, r, 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(ctx, w, r, 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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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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if subFromToken == "" {
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writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, errors.New("STS JWT Token has `sub` claim missing, `sub` claim is mandatory"))
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return
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}
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var issFromToken string
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if v, ok := m[issClaim]; ok {
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issFromToken, _ = v.(string)
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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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policies := strings.Join(policySet.ToSlice(), ",")
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if ok {
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policyName = globalIAMSys.CurrentPolicies(policies)
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}
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if globalPolicyOPA == nil {
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if !ok {
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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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} else if policyName == "" {
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writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue,
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fmt.Errorf("None of the given policies (`%s`) are defined, credentials will not be generated", policies))
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return
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}
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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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// https://openid.net/specs/openid-connect-core-1_0.html#ClaimStability
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// claim is only considered stable when subject and iss are used together
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// this is to ensure that ParentUser doesn't change and we get to use
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// parentUser as per the requirements for service accounts for OpenID
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// based logins.
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cred.ParentUser = "jwt:" + subFromToken + ":" + issFromToken
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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(ctx, w, r, 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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}
|
|
|
|
action := r.Form.Get(stsAction)
|
|
switch action {
|
|
case ldapIdentity:
|
|
default:
|
|
writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, fmt.Errorf("Unsupported action %s", action))
|
|
return
|
|
}
|
|
|
|
sessionPolicyStr := r.Form.Get(stsPolicy)
|
|
// https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRole.html
|
|
// The plain text that you use for both inline and managed session
|
|
// policies shouldn't exceed 2048 characters.
|
|
if len(sessionPolicyStr) > 2048 {
|
|
writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, fmt.Errorf("Session policy should not exceed 2048 characters"))
|
|
return
|
|
}
|
|
|
|
if len(sessionPolicyStr) > 0 {
|
|
sessionPolicy, err := iampolicy.ParseConfig(bytes.NewReader([]byte(sessionPolicyStr)))
|
|
if err != nil {
|
|
writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, err)
|
|
return
|
|
}
|
|
|
|
// 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, groupDistNames, err := globalLDAPConfig.Bind(ldapUsername, ldapPassword)
|
|
if err != nil {
|
|
err = fmt.Errorf("LDAP server error: %w", err)
|
|
writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue, err)
|
|
return
|
|
}
|
|
|
|
// Check if this user or their groups have a policy applied.
|
|
ldapPolicies, _ := globalIAMSys.PolicyDBGet(ldapUserDN, false, groupDistNames...)
|
|
if len(ldapPolicies) == 0 && globalPolicyOPA == nil {
|
|
writeSTSErrorResponse(ctx, w, true, ErrSTSInvalidParameterValue,
|
|
fmt.Errorf("expecting a policy to be set for user `%s` or one of their groups: `%s` - rejecting this request",
|
|
ldapUserDN, strings.Join(groupDistNames, "`,`")))
|
|
return
|
|
}
|
|
|
|
expiryDur := globalLDAPConfig.GetExpiryDuration()
|
|
m := map[string]interface{}{
|
|
expClaim: UTCNow().Add(expiryDur).Unix(),
|
|
ldapUsername: ldapUsername,
|
|
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 = groupDistNames
|
|
|
|
// 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)
|
|
}
|