// Copyright (c) 2015-2021 MinIO, Inc. // // This file is part of MinIO Object Storage stack // // This program is free software: you can redistribute it and/or modify // it under the terms of the GNU Affero General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // // This program is distributed in the hope that it will be useful // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU Affero General Public License for more details. // // You should have received a copy of the GNU Affero General Public License // along with this program. If not, see . package cmd import ( "bytes" "context" "encoding/base64" "encoding/json" "errors" "fmt" "math/rand" "path" "sort" "strings" "sync" "sync/atomic" "time" humanize "github.com/dustin/go-humanize" "github.com/minio/madmin-go/v2" "github.com/minio/minio-go/v7/pkg/set" "github.com/minio/minio/internal/arn" "github.com/minio/minio/internal/auth" "github.com/minio/minio/internal/color" "github.com/minio/minio/internal/config" xldap "github.com/minio/minio/internal/config/identity/ldap" "github.com/minio/minio/internal/config/identity/openid" idplugin "github.com/minio/minio/internal/config/identity/plugin" "github.com/minio/minio/internal/config/policy/opa" polplugin "github.com/minio/minio/internal/config/policy/plugin" xhttp "github.com/minio/minio/internal/http" "github.com/minio/minio/internal/jwt" "github.com/minio/minio/internal/logger" iampolicy "github.com/minio/pkg/iam/policy" etcd "go.etcd.io/etcd/client/v3" ) // UsersSysType - defines the type of users and groups system that is // active on the server. type UsersSysType string // Types of users configured in the server. const ( // This mode uses the internal users system in MinIO. MinIOUsersSysType UsersSysType = "MinIOUsersSys" // This mode uses users and groups from a configured LDAP // server. LDAPUsersSysType UsersSysType = "LDAPUsersSys" ) const ( statusEnabled = "enabled" statusDisabled = "disabled" ) const ( embeddedPolicyType = "embedded-policy" inheritedPolicyType = "inherited-policy" ) // IAMSys - config system. type IAMSys struct { // Need to keep them here to keep alignment - ref: https://golang.org/pkg/sync/atomic/#pkg-note-BUG // metrics LastRefreshTimeUnixNano uint64 LastRefreshDurationMilliseconds uint64 TotalRefreshSuccesses uint64 TotalRefreshFailures uint64 sync.Mutex iamRefreshInterval time.Duration ldapConfig xldap.Config // only valid if usersSysType is LDAPUsers openIDConfig openid.Config // only valid if OpenID is configured usersSysType UsersSysType rolesMap map[arn.ARN]string // Persistence layer for IAM subsystem store *IAMStoreSys // configLoaded will be closed and remain so after first load. configLoaded chan struct{} } // IAMUserType represents a user type inside MinIO server type IAMUserType int const ( unknownIAMUserType IAMUserType = iota - 1 regUser stsUser svcUser ) // LoadGroup - loads a specific group from storage, and updates the // memberships cache. If the specified group does not exist in // storage, it is removed from in-memory maps as well - this // simplifies the implementation for group removal. This is called // only via IAM notifications. func (sys *IAMSys) LoadGroup(ctx context.Context, objAPI ObjectLayer, group string) error { if !sys.Initialized() { return errServerNotInitialized } return sys.store.GroupNotificationHandler(ctx, group) } // LoadPolicy - reloads a specific canned policy from backend disks or etcd. func (sys *IAMSys) LoadPolicy(ctx context.Context, objAPI ObjectLayer, policyName string) error { if !sys.Initialized() { return errServerNotInitialized } return sys.store.PolicyNotificationHandler(ctx, policyName) } // LoadPolicyMapping - loads the mapped policy for a user or group // from storage into server memory. func (sys *IAMSys) LoadPolicyMapping(ctx context.Context, objAPI ObjectLayer, userOrGroup string, userType IAMUserType, isGroup bool) error { if !sys.Initialized() { return errServerNotInitialized } return sys.store.PolicyMappingNotificationHandler(ctx, userOrGroup, isGroup, userType) } // LoadUser - reloads a specific user from backend disks or etcd. func (sys *IAMSys) LoadUser(ctx context.Context, objAPI ObjectLayer, accessKey string, userType IAMUserType) error { if !sys.Initialized() { return errServerNotInitialized } return sys.store.UserNotificationHandler(ctx, accessKey, userType) } // LoadServiceAccount - reloads a specific service account from backend disks or etcd. func (sys *IAMSys) LoadServiceAccount(ctx context.Context, accessKey string) error { if !sys.Initialized() { return errServerNotInitialized } return sys.store.UserNotificationHandler(ctx, accessKey, svcUser) } // initStore initializes IAM stores func (sys *IAMSys) initStore(objAPI ObjectLayer, etcdClient *etcd.Client) { if sys.ldapConfig.Enabled() { sys.SetUsersSysType(LDAPUsersSysType) } if etcdClient == nil { sys.store = &IAMStoreSys{newIAMObjectStore(objAPI, sys.usersSysType)} } else { sys.store = &IAMStoreSys{newIAMEtcdStore(etcdClient, sys.usersSysType)} } } // Initialized checks if IAM is initialized func (sys *IAMSys) Initialized() bool { if sys == nil { return false } sys.Lock() defer sys.Unlock() return sys.store != nil } // Load - loads all credentials, policies and policy mappings. func (sys *IAMSys) Load(ctx context.Context) error { loadStartTime := time.Now() err := sys.store.LoadIAMCache(ctx) if err != nil { atomic.AddUint64(&sys.TotalRefreshFailures, 1) return err } loadDuration := time.Since(loadStartTime) atomic.StoreUint64(&sys.LastRefreshDurationMilliseconds, uint64(loadDuration.Milliseconds())) atomic.StoreUint64(&sys.LastRefreshTimeUnixNano, uint64(loadStartTime.Add(loadDuration).UnixNano())) atomic.AddUint64(&sys.TotalRefreshSuccesses, 1) select { case <-sys.configLoaded: default: close(sys.configLoaded) } return nil } // Init - initializes config system by reading entries from config/iam func (sys *IAMSys) Init(ctx context.Context, objAPI ObjectLayer, etcdClient *etcd.Client, iamRefreshInterval time.Duration) { globalServerConfigMu.RLock() s := globalServerConfig globalServerConfigMu.RUnlock() var err error globalOpenIDConfig, err = openid.LookupConfig(s, NewHTTPTransport(), xhttp.DrainBody, globalSite.Region) if err != nil { logger.LogIf(ctx, fmt.Errorf("Unable to initialize OpenID: %w", err)) } // Initialize if LDAP is enabled globalLDAPConfig, err = xldap.Lookup(s, globalRootCAs) if err != nil { logger.LogIf(ctx, fmt.Errorf("Unable to parse LDAP configuration: %w", err)) } authNPluginCfg, err := idplugin.LookupConfig(s[config.IdentityPluginSubSys][config.Default], NewHTTPTransport(), xhttp.DrainBody, globalSite.Region) if err != nil { logger.LogIf(ctx, fmt.Errorf("Unable to initialize AuthNPlugin: %w", err)) } setGlobalAuthNPlugin(idplugin.New(authNPluginCfg)) authZPluginCfg, err := polplugin.LookupConfig(s[config.PolicyPluginSubSys][config.Default], NewHTTPTransport(), xhttp.DrainBody) if err != nil { logger.LogIf(ctx, fmt.Errorf("Unable to initialize AuthZPlugin: %w", err)) } if authZPluginCfg.URL == nil { opaCfg, err := opa.LookupConfig(s[config.PolicyOPASubSys][config.Default], NewHTTPTransport(), xhttp.DrainBody) if err != nil { logger.LogIf(ctx, fmt.Errorf("Unable to initialize AuthZPlugin from legacy OPA config: %w", err)) } else { authZPluginCfg.URL = opaCfg.URL authZPluginCfg.AuthToken = opaCfg.AuthToken authZPluginCfg.Transport = opaCfg.Transport authZPluginCfg.CloseRespFn = opaCfg.CloseRespFn } } setGlobalAuthZPlugin(polplugin.New(authZPluginCfg)) sys.Lock() defer sys.Unlock() sys.ldapConfig = globalLDAPConfig.Clone() sys.openIDConfig = globalOpenIDConfig.Clone() sys.iamRefreshInterval = iamRefreshInterval // Initialize IAM store sys.initStore(objAPI, etcdClient) retryCtx, cancel := context.WithCancel(ctx) // Indicate to our routine to exit cleanly upon return. defer cancel() r := rand.New(rand.NewSource(time.Now().UnixNano())) // Migrate storage format if needed. for { if etcdClient != nil { // **** WARNING **** // Migrating to encrypted backend on etcd should happen before initialization of // IAM sub-system, make sure that we do not move the above codeblock elsewhere. if err := migrateIAMConfigsEtcdToEncrypted(retryCtx, etcdClient); err != nil { if errors.Is(err, errEtcdUnreachable) { logger.Info("Connection to etcd timed out. Retrying..") continue } logger.LogIf(ctx, fmt.Errorf("Unable to decrypt an encrypted ETCD backend for IAM users and policies: %w", err)) logger.LogIf(ctx, errors.New("IAM sub-system is partially initialized, some users may not be available")) return } } // Migrate IAM configuration, if necessary. if err := saveIAMFormat(retryCtx, sys.store); err != nil { if configRetriableErrors(err) { logger.Info("Waiting for all MinIO IAM sub-system to be initialized.. possible cause (%v)", err) continue } logger.LogIf(ctx, errors.New("IAM sub-system is partially initialized, unable to write the IAM format")) return } break } // Load IAM data from storage. for { if err := sys.Load(retryCtx); err != nil { if configRetriableErrors(err) { logger.Info("Waiting for all MinIO IAM sub-system to be initialized.. possible cause (%v)", err) time.Sleep(time.Duration(r.Float64() * float64(5*time.Second))) continue } if err != nil { logger.LogIf(ctx, fmt.Errorf("Unable to initialize IAM sub-system, some users may not be available %w", err)) } } break } refreshInterval := sys.iamRefreshInterval // Set up polling for expired accounts and credentials purging. switch { case sys.openIDConfig.ProviderEnabled(): go func() { timer := time.NewTimer(refreshInterval) defer timer.Stop() for { select { case <-timer.C: sys.purgeExpiredCredentialsForExternalSSO(ctx) timer.Reset(refreshInterval) case <-ctx.Done(): return } } }() case sys.ldapConfig.Enabled(): go func() { timer := time.NewTimer(refreshInterval) defer timer.Stop() for { select { case <-timer.C: sys.purgeExpiredCredentialsForLDAP(ctx) sys.updateGroupMembershipsForLDAP(ctx) timer.Reset(refreshInterval) case <-ctx.Done(): return } } }() } // Start watching changes to storage. go sys.watch(ctx) // Load RoleARNs sys.rolesMap = make(map[arn.ARN]string) // From OpenID if riMap := globalOpenIDConfig.GetRoleInfo(); riMap != nil { sys.validateAndAddRolePolicyMappings(ctx, riMap) } // From AuthN plugin if enabled. if authn := newGlobalAuthNPluginFn(); authn != nil { riMap := authn.GetRoleInfo() sys.validateAndAddRolePolicyMappings(ctx, riMap) } sys.printIAMRoles() } func (sys *IAMSys) validateAndAddRolePolicyMappings(ctx context.Context, m map[arn.ARN]string) { // Validate that policies associated with roles are defined. If // authZ plugin is set, role policies are just claims sent to // the plugin and they need not exist. // // If some mapped policies do not exist, we print some error // messages but continue any way - they can be fixed in the // running server by creating the policies after start up. for arn, rolePolicies := range m { specifiedPoliciesSet := newMappedPolicy(rolePolicies).policySet() validPolicies, _ := sys.store.FilterPolicies(rolePolicies, "") knownPoliciesSet := newMappedPolicy(validPolicies).policySet() unknownPoliciesSet := specifiedPoliciesSet.Difference(knownPoliciesSet) if len(unknownPoliciesSet) > 0 { authz := newGlobalAuthZPluginFn() if authz == nil { // Print a warning that some policies mapped to a role are not defined. errMsg := fmt.Errorf( "The policies \"%s\" mapped to role ARN %s are not defined - this role may not work as expected.", unknownPoliciesSet.ToSlice(), arn.String()) logger.LogIf(ctx, errMsg) } } sys.rolesMap[arn] = rolePolicies } } // Prints IAM role ARNs. func (sys *IAMSys) printIAMRoles() { if len(sys.rolesMap) == 0 { return } var arns []string for arn := range sys.rolesMap { arns = append(arns, arn.String()) } sort.Strings(arns) msgs := make([]string, 0, len(arns)) for _, arn := range arns { msgs = append(msgs, color.Bold(arn)) } logger.Info(fmt.Sprintf("%s %s", color.Blue("IAM Roles:"), strings.Join(msgs, " "))) } // HasWatcher - returns if the IAM system has a watcher to be notified of // changes. func (sys *IAMSys) HasWatcher() bool { return sys.store.HasWatcher() } func (sys *IAMSys) watch(ctx context.Context) { watcher, ok := sys.store.IAMStorageAPI.(iamStorageWatcher) if ok { ch := watcher.watch(ctx, iamConfigPrefix) for event := range ch { if err := sys.loadWatchedEvent(ctx, event); err != nil { // we simply log errors logger.LogIf(ctx, fmt.Errorf("Failure in loading watch event: %v", err)) } } return } var maxRefreshDurationSecondsForLog float64 = 10 // Load all items periodically timer := time.NewTimer(sys.iamRefreshInterval) defer timer.Stop() for { select { case <-timer.C: refreshStart := time.Now() if err := sys.Load(ctx); err != nil { logger.LogIf(ctx, fmt.Errorf("Failure in periodic refresh for IAM (took %.2fs): %v", time.Since(refreshStart).Seconds(), err)) } else { took := time.Since(refreshStart).Seconds() if took > maxRefreshDurationSecondsForLog { // Log if we took a lot of time to load. logger.Info("IAM refresh took %.2fs", took) } } timer.Reset(sys.iamRefreshInterval) case <-ctx.Done(): return } } } func (sys *IAMSys) loadWatchedEvent(ctx context.Context, event iamWatchEvent) (err error) { usersPrefix := strings.HasPrefix(event.keyPath, iamConfigUsersPrefix) groupsPrefix := strings.HasPrefix(event.keyPath, iamConfigGroupsPrefix) stsPrefix := strings.HasPrefix(event.keyPath, iamConfigSTSPrefix) svcPrefix := strings.HasPrefix(event.keyPath, iamConfigServiceAccountsPrefix) policyPrefix := strings.HasPrefix(event.keyPath, iamConfigPoliciesPrefix) policyDBUsersPrefix := strings.HasPrefix(event.keyPath, iamConfigPolicyDBUsersPrefix) policyDBSTSUsersPrefix := strings.HasPrefix(event.keyPath, iamConfigPolicyDBSTSUsersPrefix) policyDBGroupsPrefix := strings.HasPrefix(event.keyPath, iamConfigPolicyDBGroupsPrefix) ctx, cancel := context.WithTimeout(ctx, defaultContextTimeout) defer cancel() switch { case usersPrefix: accessKey := path.Dir(strings.TrimPrefix(event.keyPath, iamConfigUsersPrefix)) err = sys.store.UserNotificationHandler(ctx, accessKey, regUser) case stsPrefix: accessKey := path.Dir(strings.TrimPrefix(event.keyPath, iamConfigSTSPrefix)) err = sys.store.UserNotificationHandler(ctx, accessKey, stsUser) case svcPrefix: accessKey := path.Dir(strings.TrimPrefix(event.keyPath, iamConfigServiceAccountsPrefix)) err = sys.store.UserNotificationHandler(ctx, accessKey, svcUser) case groupsPrefix: group := path.Dir(strings.TrimPrefix(event.keyPath, iamConfigGroupsPrefix)) err = sys.store.GroupNotificationHandler(ctx, group) case policyPrefix: policyName := path.Dir(strings.TrimPrefix(event.keyPath, iamConfigPoliciesPrefix)) err = sys.store.PolicyNotificationHandler(ctx, policyName) case policyDBUsersPrefix: policyMapFile := strings.TrimPrefix(event.keyPath, iamConfigPolicyDBUsersPrefix) user := strings.TrimSuffix(policyMapFile, ".json") err = sys.store.PolicyMappingNotificationHandler(ctx, user, false, regUser) case policyDBSTSUsersPrefix: policyMapFile := strings.TrimPrefix(event.keyPath, iamConfigPolicyDBSTSUsersPrefix) user := strings.TrimSuffix(policyMapFile, ".json") err = sys.store.PolicyMappingNotificationHandler(ctx, user, false, stsUser) case policyDBGroupsPrefix: policyMapFile := strings.TrimPrefix(event.keyPath, iamConfigPolicyDBGroupsPrefix) user := strings.TrimSuffix(policyMapFile, ".json") err = sys.store.PolicyMappingNotificationHandler(ctx, user, true, regUser) } return err } // HasRolePolicy - returns if a role policy is configured for IAM. func (sys *IAMSys) HasRolePolicy() bool { return len(sys.rolesMap) > 0 } // GetRolePolicy - returns policies associated with a role ARN. func (sys *IAMSys) GetRolePolicy(arnStr string) (arn.ARN, string, error) { roleArn, err := arn.Parse(arnStr) if err != nil { return arn.ARN{}, "", fmt.Errorf("RoleARN parse err: %v", err) } rolePolicy, ok := sys.rolesMap[roleArn] if !ok { return arn.ARN{}, "", fmt.Errorf("RoleARN %s is not defined.", arnStr) } return roleArn, rolePolicy, nil } // DeletePolicy - deletes a canned policy from backend or etcd. func (sys *IAMSys) DeletePolicy(ctx context.Context, policyName string, notifyPeers bool) error { if !sys.Initialized() { return errServerNotInitialized } err := sys.store.DeletePolicy(ctx, policyName) if err != nil { return err } if !notifyPeers || sys.HasWatcher() { return nil } // Notify all other MinIO peers to delete policy for _, nerr := range globalNotificationSys.DeletePolicy(policyName) { if nerr.Err != nil { logger.GetReqInfo(ctx).SetTags("peerAddress", nerr.Host.String()) logger.LogIf(ctx, nerr.Err) } } return nil } // InfoPolicy - returns the policy definition with some metadata. func (sys *IAMSys) InfoPolicy(policyName string) (*madmin.PolicyInfo, error) { if !sys.Initialized() { return nil, errServerNotInitialized } d, err := sys.store.GetPolicyDoc(policyName) if err != nil { return nil, err } pdata, err := json.Marshal(d.Policy) if err != nil { return nil, err } return &madmin.PolicyInfo{ PolicyName: policyName, Policy: pdata, CreateDate: d.CreateDate, UpdateDate: d.UpdateDate, }, nil } // ListPolicies - lists all canned policies. func (sys *IAMSys) ListPolicies(ctx context.Context, bucketName string) (map[string]iampolicy.Policy, error) { if !sys.Initialized() { return nil, errServerNotInitialized } select { case <-sys.configLoaded: return sys.store.ListPolicies(ctx, bucketName) case <-ctx.Done(): return nil, ctx.Err() } } // ListPolicyDocs - lists all canned policy docs. func (sys *IAMSys) ListPolicyDocs(ctx context.Context, bucketName string) (map[string]PolicyDoc, error) { if !sys.Initialized() { return nil, errServerNotInitialized } select { case <-sys.configLoaded: return sys.store.ListPolicyDocs(ctx, bucketName) case <-ctx.Done(): return nil, ctx.Err() } } // SetPolicy - sets a new named policy. func (sys *IAMSys) SetPolicy(ctx context.Context, policyName string, p iampolicy.Policy) (time.Time, error) { if !sys.Initialized() { return time.Time{}, errServerNotInitialized } updatedAt, err := sys.store.SetPolicy(ctx, policyName, p) if err != nil { return updatedAt, err } if !sys.HasWatcher() { // Notify all other MinIO peers to reload policy for _, nerr := range globalNotificationSys.LoadPolicy(policyName) { if nerr.Err != nil { logger.GetReqInfo(ctx).SetTags("peerAddress", nerr.Host.String()) logger.LogIf(ctx, nerr.Err) } } } return updatedAt, nil } // DeleteUser - delete user (only for long-term users not STS users). func (sys *IAMSys) DeleteUser(ctx context.Context, accessKey string, notifyPeers bool) error { if !sys.Initialized() { return errServerNotInitialized } if err := sys.store.DeleteUser(ctx, accessKey, regUser); err != nil { return err } // Notify all other MinIO peers to delete user. if notifyPeers && !sys.HasWatcher() { for _, nerr := range globalNotificationSys.DeleteUser(accessKey) { if nerr.Err != nil { logger.GetReqInfo(ctx).SetTags("peerAddress", nerr.Host.String()) logger.LogIf(ctx, nerr.Err) } } } return nil } // CurrentPolicies - returns comma separated policy string, from // an input policy after validating if there are any current // policies which exist on MinIO corresponding to the input. func (sys *IAMSys) CurrentPolicies(policyName string) string { if !sys.Initialized() { return "" } policies, _ := sys.store.FilterPolicies(policyName, "") return policies } func (sys *IAMSys) notifyForUser(ctx context.Context, accessKey string, isTemp bool) { // Notify all other MinIO peers to reload user. if !sys.HasWatcher() { for _, nerr := range globalNotificationSys.LoadUser(accessKey, isTemp) { if nerr.Err != nil { logger.GetReqInfo(ctx).SetTags("peerAddress", nerr.Host.String()) logger.LogIf(ctx, nerr.Err) } } } } // SetTempUser - set temporary user credentials, these credentials have an // expiry. The permissions for these STS credentials is determined in one of the // following ways: // // - RoleARN - if a role-arn is specified in the request, the STS credential's // policy is the role's policy. // // - inherited from parent - this is the case for AssumeRole API, where the // parent user is an actual real user with their own (permanent) credentials and // policy association. // // - inherited from "virtual" parent - this is the case for AssumeRoleWithLDAP // where the parent user is the DN of the actual LDAP user. The parent user // itself cannot login, but the policy associated with them determines the base // policy for the STS credential. The policy mapping can be updated by the // administrator. // // - from `Subject.CommonName` field from the STS request for // AssumeRoleWithCertificate. In this case, the policy for the STS credential // has the same name as the value of this field. // // - from special JWT claim from STS request for AssumeRoleWithOIDC API (when // not using RoleARN). The claim value can be a string or a list and refers to // the names of access policies. // // For all except the RoleARN case, the implementation is the same - the policy // for the STS credential is associated with a parent user. For the // AssumeRoleWithCertificate case, the "virtual" parent user is the value of the // `Subject.CommonName` field. For the OIDC (without RoleARN) case the "virtual" // parent is derived as a concatenation of the `sub` and `iss` fields. The // policies applicable to the STS credential are associated with this "virtual" // parent. // // When a policyName is given to this function, the policy association is // created and stored in the IAM store. Thus, it should NOT be given for the // role-arn case (because the role-to-policy mapping is separately stored // elsewhere), the AssumeRole case (because the parent user is real and their // policy is associated via policy-set API) and the AssumeRoleWithLDAP case // (because the policy association is made via policy-set API). func (sys *IAMSys) SetTempUser(ctx context.Context, accessKey string, cred auth.Credentials, policyName string) (time.Time, error) { if !sys.Initialized() { return time.Time{}, errServerNotInitialized } if newGlobalAuthZPluginFn() != nil { // If OPA is set, we do not need to set a policy mapping. policyName = "" } updatedAt, err := sys.store.SetTempUser(ctx, accessKey, cred, policyName) if err != nil { return time.Time{}, err } sys.notifyForUser(ctx, cred.AccessKey, true) return updatedAt, nil } // ListBucketUsers - list all users who can access this 'bucket' func (sys *IAMSys) ListBucketUsers(ctx context.Context, bucket string) (map[string]madmin.UserInfo, error) { if !sys.Initialized() { return nil, errServerNotInitialized } select { case <-sys.configLoaded: return sys.store.GetBucketUsers(bucket) case <-ctx.Done(): return nil, ctx.Err() } } // ListUsers - list all users. func (sys *IAMSys) ListUsers(ctx context.Context) (map[string]madmin.UserInfo, error) { if !sys.Initialized() { return nil, errServerNotInitialized } select { case <-sys.configLoaded: return sys.store.GetUsers(), nil case <-ctx.Done(): return nil, ctx.Err() } } // ListLDAPUsers - list LDAP users which has func (sys *IAMSys) ListLDAPUsers(ctx context.Context) (map[string]madmin.UserInfo, error) { if !sys.Initialized() { return nil, errServerNotInitialized } if sys.usersSysType != LDAPUsersSysType { return nil, errIAMActionNotAllowed } select { case <-sys.configLoaded: ldapUsers := make(map[string]madmin.UserInfo) for user, policy := range sys.store.GetUsersWithMappedPolicies() { ldapUsers[user] = madmin.UserInfo{ PolicyName: policy, Status: madmin.AccountEnabled, } } return ldapUsers, nil case <-ctx.Done(): return nil, ctx.Err() } } // QueryLDAPPolicyEntities - queries policy associations for LDAP users/groups/policies. func (sys *IAMSys) QueryLDAPPolicyEntities(ctx context.Context, q madmin.PolicyEntitiesQuery) (*madmin.PolicyEntitiesResult, error) { if !sys.Initialized() { return nil, errServerNotInitialized } if sys.usersSysType != LDAPUsersSysType { return nil, errIAMActionNotAllowed } select { case <-sys.configLoaded: pe := sys.store.ListLDAPPolicyMappings(q, sys.ldapConfig.IsLDAPUserDN, sys.ldapConfig.IsLDAPGroupDN) pe.Timestamp = UTCNow() return &pe, nil case <-ctx.Done(): return nil, ctx.Err() } } // IsTempUser - returns if given key is a temporary user. func (sys *IAMSys) IsTempUser(name string) (bool, string, error) { if !sys.Initialized() { return false, "", errServerNotInitialized } u, found := sys.store.GetUser(name) if !found { return false, "", errNoSuchUser } cred := u.Credentials if cred.IsTemp() { return true, cred.ParentUser, nil } return false, "", nil } // IsServiceAccount - returns if given key is a service account func (sys *IAMSys) IsServiceAccount(name string) (bool, string, error) { if !sys.Initialized() { return false, "", errServerNotInitialized } u, found := sys.store.GetUser(name) if !found { return false, "", errNoSuchUser } cred := u.Credentials if cred.IsServiceAccount() { return true, cred.ParentUser, nil } return false, "", nil } // GetUserInfo - get info on a user. func (sys *IAMSys) GetUserInfo(ctx context.Context, name string) (u madmin.UserInfo, err error) { if !sys.Initialized() { return u, errServerNotInitialized } select { case <-sys.configLoaded: default: sys.store.LoadUser(ctx, name) } return sys.store.GetUserInfo(name) } // SetUserStatus - sets current user status, supports disabled or enabled. func (sys *IAMSys) SetUserStatus(ctx context.Context, accessKey string, status madmin.AccountStatus) (updatedAt time.Time, err error) { if !sys.Initialized() { return updatedAt, errServerNotInitialized } if sys.usersSysType != MinIOUsersSysType { return updatedAt, errIAMActionNotAllowed } updatedAt, err = sys.store.SetUserStatus(ctx, accessKey, status) if err != nil { return } sys.notifyForUser(ctx, accessKey, false) return updatedAt, nil } func (sys *IAMSys) notifyForServiceAccount(ctx context.Context, accessKey string) { // Notify all other Minio peers to reload the service account if !sys.HasWatcher() { for _, nerr := range globalNotificationSys.LoadServiceAccount(accessKey) { if nerr.Err != nil { logger.GetReqInfo(ctx).SetTags("peerAddress", nerr.Host.String()) logger.LogIf(ctx, nerr.Err) } } } } type newServiceAccountOpts struct { sessionPolicy *iampolicy.Policy accessKey string secretKey string claims map[string]interface{} } // NewServiceAccount - create a new service account func (sys *IAMSys) NewServiceAccount(ctx context.Context, parentUser string, groups []string, opts newServiceAccountOpts) (auth.Credentials, time.Time, error) { if !sys.Initialized() { return auth.Credentials{}, time.Time{}, errServerNotInitialized } if parentUser == "" { return auth.Credentials{}, time.Time{}, errInvalidArgument } var policyBuf []byte if opts.sessionPolicy != nil { err := opts.sessionPolicy.Validate() if err != nil { return auth.Credentials{}, time.Time{}, err } policyBuf, err = json.Marshal(opts.sessionPolicy) if err != nil { return auth.Credentials{}, time.Time{}, err } if len(policyBuf) > 16*humanize.KiByte { return auth.Credentials{}, time.Time{}, fmt.Errorf("Session policy should not exceed 16 KiB characters") } } // found newly requested service account, to be same as // parentUser, reject such operations. if parentUser == opts.accessKey { return auth.Credentials{}, time.Time{}, errIAMActionNotAllowed } m := make(map[string]interface{}) m[parentClaim] = parentUser if len(policyBuf) > 0 { m[iampolicy.SessionPolicyName] = base64.StdEncoding.EncodeToString(policyBuf) m[iamPolicyClaimNameSA()] = embeddedPolicyType } else { m[iamPolicyClaimNameSA()] = inheritedPolicyType } // Add all the necessary claims for the service accounts. for k, v := range opts.claims { _, ok := m[k] if !ok { m[k] = v } } var accessKey, secretKey string var err error if len(opts.accessKey) > 0 { accessKey, secretKey = opts.accessKey, opts.secretKey } else { accessKey, secretKey, err = auth.GenerateCredentials() if err != nil { return auth.Credentials{}, time.Time{}, err } } cred, err := auth.CreateNewCredentialsWithMetadata(accessKey, secretKey, m, secretKey) if err != nil { return auth.Credentials{}, time.Time{}, err } cred.ParentUser = parentUser cred.Groups = groups cred.Status = string(auth.AccountOn) updatedAt, err := sys.store.AddServiceAccount(ctx, cred) if err != nil { return auth.Credentials{}, time.Time{}, err } sys.notifyForServiceAccount(ctx, cred.AccessKey) return cred, updatedAt, nil } type updateServiceAccountOpts struct { sessionPolicy *iampolicy.Policy secretKey string status string } // UpdateServiceAccount - edit a service account func (sys *IAMSys) UpdateServiceAccount(ctx context.Context, accessKey string, opts updateServiceAccountOpts) (updatedAt time.Time, err error) { if !sys.Initialized() { return updatedAt, errServerNotInitialized } updatedAt, err = sys.store.UpdateServiceAccount(ctx, accessKey, opts) if err != nil { return updatedAt, err } sys.notifyForServiceAccount(ctx, accessKey) return updatedAt, nil } // ListServiceAccounts - lists all services accounts associated to a specific user func (sys *IAMSys) ListServiceAccounts(ctx context.Context, accessKey string) ([]auth.Credentials, error) { if !sys.Initialized() { return nil, errServerNotInitialized } select { case <-sys.configLoaded: return sys.store.ListServiceAccounts(ctx, accessKey) case <-ctx.Done(): return nil, ctx.Err() } } // ListTempAccounts - lists all services accounts associated to a specific user func (sys *IAMSys) ListTempAccounts(ctx context.Context, accessKey string) ([]UserIdentity, error) { if !sys.Initialized() { return nil, errServerNotInitialized } select { case <-sys.configLoaded: return sys.store.ListTempAccounts(ctx, accessKey) case <-ctx.Done(): return nil, ctx.Err() } } // GetServiceAccount - wrapper method to get information about a service account func (sys *IAMSys) GetServiceAccount(ctx context.Context, accessKey string) (auth.Credentials, *iampolicy.Policy, error) { sa, embeddedPolicy, err := sys.getServiceAccount(ctx, accessKey) if err != nil { return auth.Credentials{}, nil, err } // Hide secret & session keys sa.Credentials.SecretKey = "" sa.Credentials.SessionToken = "" return sa.Credentials, embeddedPolicy, nil } func (sys *IAMSys) getServiceAccount(ctx context.Context, accessKey string) (UserIdentity, *iampolicy.Policy, error) { sa, embeddedPolicy, err := sys.getAccountWithEmbeddedPolicy(ctx, accessKey) if err != nil { if err == errNoSuchAccount { return UserIdentity{}, nil, errNoSuchServiceAccount } return UserIdentity{}, nil, err } if !sa.Credentials.IsServiceAccount() { return UserIdentity{}, nil, errNoSuchServiceAccount } return sa, embeddedPolicy, nil } func (sys *IAMSys) getTempAccount(ctx context.Context, accessKey string) (UserIdentity, *iampolicy.Policy, error) { tmpAcc, embeddedPolicy, err := sys.getAccountWithEmbeddedPolicy(ctx, accessKey) if err != nil { if err == errNoSuchAccount { return UserIdentity{}, nil, errNoSuchTempAccount } return UserIdentity{}, nil, err } if !tmpAcc.Credentials.IsTemp() { return UserIdentity{}, nil, errNoSuchTempAccount } return tmpAcc, embeddedPolicy, nil } // getAccountWithEmbeddedPolicy - gets information about an account with its embedded policy if found func (sys *IAMSys) getAccountWithEmbeddedPolicy(ctx context.Context, accessKey string) (u UserIdentity, p *iampolicy.Policy, err error) { if !sys.Initialized() { return u, nil, errServerNotInitialized } sa, ok := sys.store.GetUser(accessKey) if !ok { return u, nil, errNoSuchAccount } var embeddedPolicy *iampolicy.Policy jwtClaims, err := auth.ExtractClaims(sa.Credentials.SessionToken, sa.Credentials.SecretKey) if err != nil { jwtClaims, err = auth.ExtractClaims(sa.Credentials.SessionToken, globalActiveCred.SecretKey) if err != nil { return u, nil, err } } pt, ptok := jwtClaims.Lookup(iamPolicyClaimNameSA()) sp, spok := jwtClaims.Lookup(iampolicy.SessionPolicyName) if ptok && spok && pt == embeddedPolicyType { policyBytes, err := base64.StdEncoding.DecodeString(sp) if err != nil { return u, nil, err } embeddedPolicy, err = iampolicy.ParseConfig(bytes.NewReader(policyBytes)) if err != nil { return u, nil, err } } return sa, embeddedPolicy, nil } // GetClaimsForSvcAcc - gets the claims associated with the service account. func (sys *IAMSys) GetClaimsForSvcAcc(ctx context.Context, accessKey string) (map[string]interface{}, error) { if !sys.Initialized() { return nil, errServerNotInitialized } if sys.usersSysType != LDAPUsersSysType { return nil, nil } sa, ok := sys.store.GetUser(accessKey) if !ok || !sa.Credentials.IsServiceAccount() { return nil, errNoSuchServiceAccount } jwtClaims, err := auth.ExtractClaims(sa.Credentials.SessionToken, sa.Credentials.SecretKey) if err != nil { jwtClaims, err = auth.ExtractClaims(sa.Credentials.SessionToken, globalActiveCred.SecretKey) if err != nil { return nil, err } } return jwtClaims.Map(), nil } // DeleteServiceAccount - delete a service account func (sys *IAMSys) DeleteServiceAccount(ctx context.Context, accessKey string, notifyPeers bool) error { if !sys.Initialized() { return errServerNotInitialized } sa, ok := sys.store.GetUser(accessKey) if !ok || !sa.Credentials.IsServiceAccount() { return nil } if err := sys.store.DeleteUser(ctx, accessKey, svcUser); err != nil { return err } if notifyPeers && !sys.HasWatcher() { for _, nerr := range globalNotificationSys.DeleteServiceAccount(accessKey) { if nerr.Err != nil { logger.GetReqInfo(ctx).SetTags("peerAddress", nerr.Host.String()) logger.LogIf(ctx, nerr.Err) } } } return nil } // CreateUser - create new user credentials and policy, if user already exists // they shall be rewritten with new inputs. func (sys *IAMSys) CreateUser(ctx context.Context, accessKey string, ureq madmin.AddOrUpdateUserReq) (updatedAt time.Time, err error) { if !sys.Initialized() { return updatedAt, errServerNotInitialized } if sys.usersSysType != MinIOUsersSysType { return updatedAt, errIAMActionNotAllowed } if !auth.IsAccessKeyValid(accessKey) { return updatedAt, auth.ErrInvalidAccessKeyLength } if !auth.IsSecretKeyValid(ureq.SecretKey) { return updatedAt, auth.ErrInvalidSecretKeyLength } updatedAt, err = sys.store.AddUser(ctx, accessKey, ureq) if err != nil { return updatedAt, err } sys.notifyForUser(ctx, accessKey, false) return updatedAt, nil } // SetUserSecretKey - sets user secret key func (sys *IAMSys) SetUserSecretKey(ctx context.Context, accessKey string, secretKey string) error { if !sys.Initialized() { return errServerNotInitialized } if sys.usersSysType != MinIOUsersSysType { return errIAMActionNotAllowed } if !auth.IsAccessKeyValid(accessKey) { return auth.ErrInvalidAccessKeyLength } if !auth.IsSecretKeyValid(secretKey) { return auth.ErrInvalidSecretKeyLength } return sys.store.UpdateUserSecretKey(ctx, accessKey, secretKey) } // purgeExpiredCredentialsForExternalSSO - validates if local credentials are still valid // by checking remote IDP if the relevant users are still active and present. func (sys *IAMSys) purgeExpiredCredentialsForExternalSSO(ctx context.Context) { parentUsersMap := sys.store.GetAllParentUsers() var expiredUsers []string for parentUser, puInfo := range parentUsersMap { // There are multiple role ARNs for parent user only when there // are multiple openid provider configurations with the same ID // provider. We lookup the provider associated with some one of // the roleARNs to check if the user still exists. If they don't // we can safely remove credentials for this parent user // associated with any of the provider configurations. // // If there is no roleARN mapped to the user, the user may be // coming from a policy claim based openid provider. roleArns := puInfo.roleArns.ToSlice() var roleArn string if len(roleArns) == 0 { logger.LogIf(GlobalContext, fmt.Errorf("parentUser: %s had no roleArns mapped!", parentUser)) continue } roleArn = roleArns[0] u, err := sys.openIDConfig.LookupUser(roleArn, puInfo.subClaimValue) if err != nil { logger.LogIf(GlobalContext, err) continue } // If user is set to "disabled", we will remove them // subsequently. if !u.Enabled { expiredUsers = append(expiredUsers, parentUser) } } // We ignore any errors _ = sys.store.DeleteUsers(ctx, expiredUsers) } // purgeExpiredCredentialsForLDAP - validates if local credentials are still // valid by checking LDAP server if the relevant users are still present. func (sys *IAMSys) purgeExpiredCredentialsForLDAP(ctx context.Context) { parentUsers := sys.store.GetAllParentUsers() var allDistNames []string for parentUser := range parentUsers { if !sys.ldapConfig.IsLDAPUserDN(parentUser) { continue } allDistNames = append(allDistNames, parentUser) } expiredUsers, err := sys.ldapConfig.GetNonEligibleUserDistNames(allDistNames) if err != nil { // Log and return on error - perhaps it'll work the next time. logger.LogIf(GlobalContext, err) return } // We ignore any errors _ = sys.store.DeleteUsers(ctx, expiredUsers) } // updateGroupMembershipsForLDAP - updates the list of groups associated with the credential. func (sys *IAMSys) updateGroupMembershipsForLDAP(ctx context.Context) { // 1. Collect all LDAP users with active creds. allCreds := sys.store.GetSTSAndServiceAccounts() // List of unique LDAP (parent) user DNs that have active creds var parentUsers []string // Map of LDAP user to list of active credential objects parentUserToCredsMap := make(map[string][]auth.Credentials) // DN to ldap username mapping for each LDAP user parentUserToLDAPUsernameMap := make(map[string]string) for _, cred := range allCreds { if !sys.ldapConfig.IsLDAPUserDN(cred.ParentUser) { continue } // Check if this is the first time we are // encountering this LDAP user. if _, ok := parentUserToCredsMap[cred.ParentUser]; !ok { // Try to find the ldapUsername for this // parentUser by extracting JWT claims var ( jwtClaims *jwt.MapClaims err error ) if cred.SessionToken == "" { continue } if cred.IsServiceAccount() { jwtClaims, err = auth.ExtractClaims(cred.SessionToken, cred.SecretKey) if err != nil { jwtClaims, err = auth.ExtractClaims(cred.SessionToken, globalActiveCred.SecretKey) } } else { jwtClaims, err = auth.ExtractClaims(cred.SessionToken, globalActiveCred.SecretKey) } if err != nil { // skip this cred - session token seems invalid continue } ldapUsername, ok := jwtClaims.Lookup(ldapUserN) if !ok { // skip this cred - we dont have the // username info needed continue } // Collect each new cred.ParentUser into parentUsers parentUsers = append(parentUsers, cred.ParentUser) // Update the ldapUsernameMap parentUserToLDAPUsernameMap[cred.ParentUser] = ldapUsername } parentUserToCredsMap[cred.ParentUser] = append(parentUserToCredsMap[cred.ParentUser], cred) } // 2. Query LDAP server for groups of the LDAP users collected. updatedGroups, err := sys.ldapConfig.LookupGroupMemberships(parentUsers, parentUserToLDAPUsernameMap) if err != nil { // Log and return on error - perhaps it'll work the next time. logger.LogIf(GlobalContext, err) return } // 3. Update creds for those users whose groups are changed for _, parentUser := range parentUsers { currGroupsSet := updatedGroups[parentUser] currGroups := currGroupsSet.ToSlice() for _, cred := range parentUserToCredsMap[parentUser] { gSet := set.CreateStringSet(cred.Groups...) if gSet.Equals(currGroupsSet) { // No change to groups memberships for this // credential. continue } cred.Groups = currGroups if err := sys.store.UpdateUserIdentity(ctx, cred); err != nil { // Log and continue error - perhaps it'll work the next time. logger.LogIf(GlobalContext, err) } } } } // GetUser - get user credentials func (sys *IAMSys) GetUser(ctx context.Context, accessKey string) (u UserIdentity, ok bool) { if !sys.Initialized() { return u, false } fallback := false select { case <-sys.configLoaded: default: sys.store.LoadUser(ctx, accessKey) fallback = true } u, ok = sys.store.GetUser(accessKey) if !ok && !fallback { // accessKey not found, also // IAM store is not in fallback mode // we can try to reload again from // the IAM store and see if credential // exists now. If it doesn't proceed to // fail. sys.store.LoadUser(ctx, accessKey) u, ok = sys.store.GetUser(accessKey) } return u, ok && u.Credentials.IsValid() } // Notify all other MinIO peers to load group. func (sys *IAMSys) notifyForGroup(ctx context.Context, group string) { if !sys.HasWatcher() { for _, nerr := range globalNotificationSys.LoadGroup(group) { if nerr.Err != nil { logger.GetReqInfo(ctx).SetTags("peerAddress", nerr.Host.String()) logger.LogIf(ctx, nerr.Err) } } } } // AddUsersToGroup - adds users to a group, creating the group if // needed. No error if user(s) already are in the group. func (sys *IAMSys) AddUsersToGroup(ctx context.Context, group string, members []string) (updatedAt time.Time, err error) { if !sys.Initialized() { return updatedAt, errServerNotInitialized } if sys.usersSysType != MinIOUsersSysType { return updatedAt, errIAMActionNotAllowed } updatedAt, err = sys.store.AddUsersToGroup(ctx, group, members) if err != nil { return updatedAt, err } sys.notifyForGroup(ctx, group) return updatedAt, nil } // RemoveUsersFromGroup - remove users from group. If no users are // given, and the group is empty, deletes the group as well. func (sys *IAMSys) RemoveUsersFromGroup(ctx context.Context, group string, members []string) (updatedAt time.Time, err error) { if !sys.Initialized() { return updatedAt, errServerNotInitialized } if sys.usersSysType != MinIOUsersSysType { return updatedAt, errIAMActionNotAllowed } updatedAt, err = sys.store.RemoveUsersFromGroup(ctx, group, members) if err != nil { return updatedAt, err } sys.notifyForGroup(ctx, group) return updatedAt, nil } // SetGroupStatus - enable/disabled a group func (sys *IAMSys) SetGroupStatus(ctx context.Context, group string, enabled bool) (updatedAt time.Time, err error) { if !sys.Initialized() { return updatedAt, errServerNotInitialized } if sys.usersSysType != MinIOUsersSysType { return updatedAt, errIAMActionNotAllowed } updatedAt, err = sys.store.SetGroupStatus(ctx, group, enabled) if err != nil { return updatedAt, err } sys.notifyForGroup(ctx, group) return updatedAt, nil } // GetGroupDescription - builds up group description func (sys *IAMSys) GetGroupDescription(group string) (gd madmin.GroupDesc, err error) { if !sys.Initialized() { return gd, errServerNotInitialized } return sys.store.GetGroupDescription(group) } // ListGroups - lists groups. func (sys *IAMSys) ListGroups(ctx context.Context) (r []string, err error) { if !sys.Initialized() { return r, errServerNotInitialized } select { case <-sys.configLoaded: return sys.store.ListGroups(ctx) case <-ctx.Done(): return nil, ctx.Err() } } // PolicyDBSet - sets a policy for a user or group in the PolicyDB - the user doesn't have to exist since sometimes they are virtuals func (sys *IAMSys) PolicyDBSet(ctx context.Context, name, policy string, userType IAMUserType, isGroup bool) (updatedAt time.Time, err error) { if !sys.Initialized() { return updatedAt, errServerNotInitialized } updatedAt, err = sys.store.PolicyDBSet(ctx, name, policy, userType, isGroup) if err != nil { return } // Notify all other MinIO peers to reload policy if !sys.HasWatcher() { for _, nerr := range globalNotificationSys.LoadPolicyMapping(name, userType, isGroup) { if nerr.Err != nil { logger.GetReqInfo(ctx).SetTags("peerAddress", nerr.Host.String()) logger.LogIf(ctx, nerr.Err) } } } return updatedAt, nil } // PolicyDBUpdateLDAP - adds or removes policies from a user or a group verified // to be in the LDAP directory. func (sys *IAMSys) PolicyDBUpdateLDAP(ctx context.Context, isAttach bool, r madmin.PolicyAssociationReq, ) (updatedAt time.Time, addedOrRemoved []string, err error) { if !sys.Initialized() { return updatedAt, nil, errServerNotInitialized } var dn string var isGroup bool if r.User != "" { dn, err = globalLDAPConfig.DoesUsernameExist(r.User) if err != nil { logger.LogIf(ctx, err) return updatedAt, nil, err } if dn == "" { return updatedAt, nil, errNoSuchUser } isGroup = false } else { if exists, err := globalLDAPConfig.DoesGroupDNExist(r.Group); err != nil { logger.LogIf(ctx, err) return updatedAt, nil, err } else if !exists { return updatedAt, nil, errNoSuchGroup } dn = r.Group isGroup = true } userType := stsUser updatedAt, addedOrRemoved, err = sys.store.PolicyDBUpdate(ctx, dn, isGroup, userType, r.Policies, isAttach) if err != nil { return updatedAt, nil, err } // Notify all other MinIO peers to reload policy if !sys.HasWatcher() { for _, nerr := range globalNotificationSys.LoadPolicyMapping(dn, userType, isGroup) { if nerr.Err != nil { logger.GetReqInfo(ctx).SetTags("peerAddress", nerr.Host.String()) logger.LogIf(ctx, nerr.Err) } } } return updatedAt, addedOrRemoved, nil } // PolicyDBGet - gets policy set on a user or group. If a list of groups is // given, policies associated with them are included as well. func (sys *IAMSys) PolicyDBGet(name string, isGroup bool, groups ...string) ([]string, error) { if !sys.Initialized() { return nil, errServerNotInitialized } return sys.store.PolicyDBGet(name, isGroup, groups...) } const sessionPolicyNameExtracted = iampolicy.SessionPolicyName + "-extracted" // IsAllowedServiceAccount - checks if the given service account is allowed to perform // actions. The permission of the parent user is checked first func (sys *IAMSys) IsAllowedServiceAccount(args iampolicy.Args, parentUser string) bool { // Verify if the parent claim matches the parentUser. p, ok := args.Claims[parentClaim] if ok { parentInClaim, ok := p.(string) if !ok { // Reject malformed/malicious requests. return false } // The parent claim in the session token should be equal // to the parent detected in the backend if parentInClaim != parentUser { return false } } else { // This is needed so a malicious user cannot // use a leaked session key of another user // to widen its privileges. return false } isOwnerDerived := parentUser == globalActiveCred.AccessKey var err error var svcPolicies []string roleArn := args.GetRoleArn() switch { case isOwnerDerived: // All actions are allowed by default and no policy evaluation is // required. case roleArn != "": arn, err := arn.Parse(roleArn) if err != nil { logger.LogIf(GlobalContext, fmt.Errorf("error parsing role ARN %s: %v", roleArn, err)) return false } svcPolicies = newMappedPolicy(sys.rolesMap[arn]).toSlice() default: // Check policy for parent user of service account. svcPolicies, err = sys.PolicyDBGet(parentUser, false, args.Groups...) if err != nil { logger.LogIf(GlobalContext, err) return false } // Finally, if there is no parent policy, check if a policy claim is // present. if len(svcPolicies) == 0 { policySet, _ := iampolicy.GetPoliciesFromClaims(args.Claims, iamPolicyClaimNameOpenID()) svcPolicies = policySet.ToSlice() } } // Defensive code: Do not allow any operation if no policy is found. if !isOwnerDerived && len(svcPolicies) == 0 { return false } var combinedPolicy iampolicy.Policy // Policies were found, evaluate all of them. if !isOwnerDerived { availablePoliciesStr, c := sys.store.FilterPolicies(strings.Join(svcPolicies, ","), "") if availablePoliciesStr == "" { return false } combinedPolicy = c } parentArgs := args parentArgs.AccountName = parentUser // These are dynamic values set them appropriately. parentArgs.ConditionValues["username"] = []string{parentUser} parentArgs.ConditionValues["userid"] = []string{parentUser} saPolicyClaim, ok := args.Claims[iamPolicyClaimNameSA()] if !ok { return false } saPolicyClaimStr, ok := saPolicyClaim.(string) if !ok { // Sub policy if set, should be a string reject // malformed/malicious requests. return false } if saPolicyClaimStr == inheritedPolicyType { return isOwnerDerived || combinedPolicy.IsAllowed(parentArgs) } // Now check if we have a sessionPolicy. spolicy, ok := args.Claims[sessionPolicyNameExtracted] if !ok { return false } spolicyStr, ok := spolicy.(string) if !ok { // Sub policy if set, should be a string reject // malformed/malicious requests. return false } // Check if policy is parseable. subPolicy, err := iampolicy.ParseConfig(bytes.NewReader([]byte(spolicyStr))) if err != nil { // Log any error in input session policy config. logger.LogIf(GlobalContext, err) return false } // This can only happen if policy was set but with an empty JSON. if subPolicy.Version == "" && len(subPolicy.Statements) == 0 { return isOwnerDerived || combinedPolicy.IsAllowed(parentArgs) } if subPolicy.Version == "" { return false } return subPolicy.IsAllowed(parentArgs) && (isOwnerDerived || combinedPolicy.IsAllowed(parentArgs)) } // IsAllowedSTS is meant for STS based temporary credentials, // which implements claims validation and verification other than // applying policies. func (sys *IAMSys) IsAllowedSTS(args iampolicy.Args, parentUser string) bool { // 1. Determine mapped policies isOwnerDerived := parentUser == globalActiveCred.AccessKey var policies []string roleArn := args.GetRoleArn() switch { case isOwnerDerived: // All actions are allowed by default and no policy evaluation is // required. case roleArn != "": // If a roleARN is present, the role policy is applied. arn, err := arn.Parse(roleArn) if err != nil { logger.LogIf(GlobalContext, fmt.Errorf("error parsing role ARN %s: %v", roleArn, err)) return false } policies = newMappedPolicy(sys.rolesMap[arn]).toSlice() default: // Otherwise, inherit parent user's policy var err error policies, err = sys.store.PolicyDBGet(parentUser, false, args.Groups...) if err != nil { logger.LogIf(GlobalContext, fmt.Errorf("error fetching policies on %s: %v", parentUser, err)) return false } // Finally, if there is no parent policy, check if a policy claim is // present in the session token. if len(policies) == 0 { // If there is no parent policy mapping, we fall back to // using policy claim from JWT. policySet, ok := args.GetPolicies(iamPolicyClaimNameOpenID()) if !ok { // When claims are set, it should have a policy claim field. return false } policies = policySet.ToSlice() } } // Defensive code: Do not allow any operation if no policy is found in the session token if !isOwnerDerived && len(policies) == 0 { return false } // 2. Combine the mapped policies into a single combined policy. var combinedPolicy iampolicy.Policy if !isOwnerDerived { var err error combinedPolicy, err = sys.store.GetPolicy(strings.Join(policies, ",")) if errors.Is(err, errNoSuchPolicy) { for _, pname := range policies { _, err := sys.store.GetPolicy(pname) if errors.Is(err, errNoSuchPolicy) { // all policies presented in the claim should exist logger.LogIf(GlobalContext, fmt.Errorf("expected policy (%s) missing from the JWT claim %s, rejecting the request", pname, iamPolicyClaimNameOpenID())) return false } } logger.LogIf(GlobalContext, fmt.Errorf("all policies were unexpectedly present!")) return false } } // 3. If an inline session-policy is present, evaluate it. // These are dynamic values set them appropriately. args.ConditionValues["username"] = []string{parentUser} args.ConditionValues["userid"] = []string{parentUser} // Now check if we have a sessionPolicy. hasSessionPolicy, isAllowedSP := isAllowedBySessionPolicy(args) if hasSessionPolicy { return isAllowedSP && (isOwnerDerived || combinedPolicy.IsAllowed(args)) } // Sub policy not set, this is most common since subPolicy // is optional, use the inherited policies. return isOwnerDerived || combinedPolicy.IsAllowed(args) } func isAllowedBySessionPolicy(args iampolicy.Args) (hasSessionPolicy bool, isAllowed bool) { hasSessionPolicy = false isAllowed = false // Now check if we have a sessionPolicy. spolicy, ok := args.Claims[sessionPolicyNameExtracted] if !ok { return } hasSessionPolicy = true spolicyStr, ok := spolicy.(string) if !ok { // Sub policy if set, should be a string reject // malformed/malicious requests. return } // Check if policy is parseable. subPolicy, err := iampolicy.ParseConfig(bytes.NewReader([]byte(spolicyStr))) if err != nil { // Log any error in input session policy config. logger.LogIf(GlobalContext, err) return } // Policy without Version string value reject it. if subPolicy.Version == "" { return } // Sub policy is set and valid. return hasSessionPolicy, subPolicy.IsAllowed(args) } // GetCombinedPolicy returns a combined policy combining all policies func (sys *IAMSys) GetCombinedPolicy(policies ...string) iampolicy.Policy { _, policy := sys.store.FilterPolicies(strings.Join(policies, ","), "") return policy } // IsAllowed - checks given policy args is allowed to continue the Rest API. func (sys *IAMSys) IsAllowed(args iampolicy.Args) bool { // If opa is configured, use OPA always. if authz := newGlobalAuthZPluginFn(); authz != nil { ok, err := authz.IsAllowed(args) if err != nil { logger.LogIf(GlobalContext, err) } return ok } // Policies don't apply to the owner. if args.IsOwner { return true } // If the credential is temporary, perform STS related checks. ok, parentUser, err := sys.IsTempUser(args.AccountName) if err != nil { return false } if ok { return sys.IsAllowedSTS(args, parentUser) } // If the credential is for a service account, perform related check ok, parentUser, err = sys.IsServiceAccount(args.AccountName) if err != nil { return false } if ok { return sys.IsAllowedServiceAccount(args, parentUser) } // Continue with the assumption of a regular user policies, err := sys.PolicyDBGet(args.AccountName, false, args.Groups...) if err != nil { return false } if len(policies) == 0 { // No policy found. return false } // Policies were found, evaluate all of them. return sys.GetCombinedPolicy(policies...).IsAllowed(args) } // SetUsersSysType - sets the users system type, regular or LDAP. func (sys *IAMSys) SetUsersSysType(t UsersSysType) { sys.usersSysType = t } // GetUsersSysType - returns the users system type for this IAM func (sys *IAMSys) GetUsersSysType() UsersSysType { return sys.usersSysType } // NewIAMSys - creates new config system object. func NewIAMSys() *IAMSys { return &IAMSys{ usersSysType: MinIOUsersSysType, configLoaded: make(chan struct{}), } }