mirror of
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189c861835
Groups information shall be now stored as part of the credential data structure, this is a more idiomatic way to support large LDAP groups. Avoids the complication of setups where LDAP groups can be in the range of 150+ which may lead to excess HTTP header size > 8KiB, to reduce such an occurrence we shall save the group information on the server as part of the credential data structure. Bonus change support multiple mapped policies, across all types of users.
542 lines
17 KiB
Go
542 lines
17 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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"strings"
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"github.com/gorilla/mux"
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"github.com/minio/minio/cmd/config/identity/openid"
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xhttp "github.com/minio/minio/cmd/http"
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"github.com/minio/minio/cmd/logger"
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"github.com/minio/minio/pkg/auth"
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iampolicy "github.com/minio/minio/pkg/iam/policy"
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"github.com/minio/minio/pkg/wildcard"
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)
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const (
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// STS API version.
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stsAPIVersion = "2011-06-15"
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stsVersion = "Version"
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stsAction = "Action"
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stsPolicy = "Policy"
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stsToken = "Token"
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stsWebIdentityToken = "WebIdentityToken"
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stsDurationSeconds = "DurationSeconds"
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stsLDAPUsername = "LDAPUsername"
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stsLDAPPassword = "LDAPPassword"
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// STS API action constants
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clientGrants = "AssumeRoleWithClientGrants"
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webIdentity = "AssumeRoleWithWebIdentity"
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ldapIdentity = "AssumeRoleWithLDAPIdentity"
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assumeRole = "AssumeRole"
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stsRequestBodyLimit = 10 * (1 << 20) // 10 MiB
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// JWT claim keys
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expClaim = "exp"
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subClaim = "sub"
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// JWT claim to check the parent user
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parentClaim = "parent"
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// LDAP claim keys
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ldapUser = "ldapUser"
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)
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// stsAPIHandlers implements and provides http handlers for AWS STS API.
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type stsAPIHandlers struct{}
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// registerSTSRouter - registers AWS STS compatible APIs.
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func registerSTSRouter(router *mux.Router) {
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// Initialize STS.
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sts := &stsAPIHandlers{}
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// STS Router
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stsRouter := router.NewRoute().PathPrefix(SlashSeparator).Subrouter()
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// Assume roles with no JWT, handles AssumeRole.
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stsRouter.Methods(http.MethodPost).MatcherFunc(func(r *http.Request, rm *mux.RouteMatch) bool {
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ctypeOk := wildcard.MatchSimple("application/x-www-form-urlencoded*", r.Header.Get(xhttp.ContentType))
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authOk := wildcard.MatchSimple(signV4Algorithm+"*", r.Header.Get(xhttp.Authorization))
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noQueries := len(r.URL.Query()) == 0
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return ctypeOk && authOk && noQueries
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}).HandlerFunc(httpTraceAll(sts.AssumeRole))
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// Assume roles with JWT handler, handles both ClientGrants and WebIdentity.
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stsRouter.Methods(http.MethodPost).MatcherFunc(func(r *http.Request, rm *mux.RouteMatch) bool {
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ctypeOk := wildcard.MatchSimple("application/x-www-form-urlencoded*", r.Header.Get(xhttp.ContentType))
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noQueries := len(r.URL.Query()) == 0
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return ctypeOk && noQueries
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}).HandlerFunc(httpTraceAll(sts.AssumeRoleWithJWT))
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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, 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, globalServerRegion, 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, globalServerRegion, 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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// 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, 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(ctx, w, 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, 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, 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, ErrSTSInvalidParameterValue, fmt.Errorf("Unsupported action %s", action))
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return
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}
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ctx = newContext(r, w, action)
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defer logger.AuditLog(w, r, action, nil)
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sessionPolicyStr := r.Form.Get(stsPolicy)
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// https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRole.html
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// The plain text that you use for both inline and managed session
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// policies shouldn't exceed 2048 characters.
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if len(sessionPolicyStr) > 2048 {
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writeSTSErrorResponse(ctx, w, 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, 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, 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, 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, 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, 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, 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) 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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writeSTSErrorResponse(ctx, w, 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, 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 clientGrants, webIdentity:
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default:
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writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, fmt.Errorf("Unsupported action %s", action))
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return
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}
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ctx = newContext(r, w, action)
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defer logger.AuditLog(w, r, action, nil)
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if globalOpenIDValidators == nil {
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writeSTSErrorResponse(ctx, w, 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, 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, ErrSTSClientGrantsExpiredToken, err)
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case webIdentity:
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writeSTSErrorResponse(ctx, w, 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, ErrSTSInvalidParameterValue, err)
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return
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}
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writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, err)
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return
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}
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sessionPolicyStr := r.Form.Get(stsPolicy)
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// https://docs.aws.amazon.com/STS/latest/APIReference/API_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, 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, 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, ErrSTSInvalidParameterValue, fmt.Errorf("Invalid session policy version"))
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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 := 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, ErrSTSInternalError, err)
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return
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}
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// JWT has requested a custom claim with policy value set.
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// This is a MinIO STS API specific value, this value should
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// be set and configured on your identity provider as part of
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// JWT custom claims.
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var policyName string
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if v, ok := m[iamPolicyClaimNameOpenID()]; 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[subClaim]; ok {
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subFromToken, _ = v.(string)
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}
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// Set the newly generated credentials.
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if err = globalIAMSys.SetTempUser(cred.AccessKey, cred, policyName); err != nil {
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writeSTSErrorResponse(ctx, w, 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.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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writeSTSErrorResponse(ctx, w, 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, 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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default:
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writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, fmt.Errorf("Unsupported action %s", action))
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return
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}
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ctx = newContext(r, w, action)
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defer logger.AuditLog(w, r, action, nil)
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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, ErrSTSMissingParameter, fmt.Errorf("LDAPUsername and LDAPPassword cannot be empty"))
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return
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}
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sessionPolicyStr := r.Form.Get(stsPolicy)
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// https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRole.html
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// The plain text that you use for both inline and managed session
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// policies shouldn't exceed 2048 characters.
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if len(sessionPolicyStr) > 2048 {
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writeSTSErrorResponse(ctx, w, 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, 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, ErrSTSInvalidParameterValue, fmt.Errorf("Version needs to be specified in session policy"))
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return
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}
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}
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groups, err := globalLDAPConfig.Bind(ldapUsername, ldapPassword)
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if err != nil {
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err = fmt.Errorf("LDAP server connection failure: %w", err)
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writeSTSErrorResponse(ctx, w, ErrSTSInvalidParameterValue, err)
|
|
return
|
|
}
|
|
|
|
expiryDur := globalLDAPConfig.GetExpiryDuration()
|
|
m := map[string]interface{}{
|
|
expClaim: UTCNow().Add(expiryDur).Unix(),
|
|
ldapUser: ldapUsername,
|
|
}
|
|
|
|
if len(sessionPolicyStr) > 0 {
|
|
m[iampolicy.SessionPolicyName] = base64.StdEncoding.EncodeToString([]byte(sessionPolicyStr))
|
|
}
|
|
|
|
secret := globalActiveCred.SecretKey
|
|
cred, err := auth.GetNewCredentialsWithMetadata(m, secret)
|
|
if err != nil {
|
|
writeSTSErrorResponse(ctx, w, ErrSTSInternalError, err)
|
|
return
|
|
}
|
|
|
|
// Set the parent of the temporary access key, this is useful
|
|
// in obtaining service accounts by this cred.
|
|
cred.ParentUser = ldapUsername
|
|
|
|
// Set this value to LDAP groups, LDAP user can be part
|
|
// of large number of groups
|
|
cred.Groups = groups
|
|
|
|
// Set the newly generated credentials, policyName is empty on purpose
|
|
// LDAP policies are applied automatically using their ldapUser, ldapGroups
|
|
// mapping.
|
|
if err = globalIAMSys.SetTempUser(cred.AccessKey, cred, ""); err != nil {
|
|
writeSTSErrorResponse(ctx, w, 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)
|
|
}
|