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360 lines
9.6 KiB
360 lines
9.6 KiB
package s3api
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import (
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"fmt"
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"net/http"
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"os"
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"strings"
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"sync"
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"github.com/seaweedfs/seaweedfs/weed/filer"
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"github.com/seaweedfs/seaweedfs/weed/glog"
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"github.com/seaweedfs/seaweedfs/weed/pb"
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"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
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"github.com/seaweedfs/seaweedfs/weed/pb/iam_pb"
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"github.com/seaweedfs/seaweedfs/weed/s3api/s3_constants"
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"github.com/seaweedfs/seaweedfs/weed/s3api/s3err"
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)
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type Action string
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type Iam interface {
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Check(f http.HandlerFunc, actions ...Action) http.HandlerFunc
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}
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type IdentityAccessManagement struct {
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m sync.RWMutex
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identities []*Identity
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isAuthEnabled bool
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domain string
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}
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type Identity struct {
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Name string
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Credentials []*Credential
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Actions []Action
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}
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type Credential struct {
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AccessKey string
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SecretKey string
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}
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func (action Action) isAdmin() bool {
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return strings.HasPrefix(string(action), s3_constants.ACTION_ADMIN)
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}
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func (action Action) isOwner(bucket string) bool {
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return string(action) == s3_constants.ACTION_ADMIN+":"+bucket
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}
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func (action Action) overBucket(bucket string) bool {
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return strings.HasSuffix(string(action), ":"+bucket) || strings.HasSuffix(string(action), ":*")
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}
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func (action Action) getPermission() Permission {
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switch act := strings.Split(string(action), ":")[0]; act {
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case s3_constants.ACTION_ADMIN:
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return Permission("FULL_CONTROL")
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case s3_constants.ACTION_WRITE:
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return Permission("WRITE")
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case s3_constants.ACTION_READ:
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return Permission("READ")
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default:
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return Permission("")
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}
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}
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func NewIdentityAccessManagement(option *S3ApiServerOption) *IdentityAccessManagement {
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iam := &IdentityAccessManagement{
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domain: option.DomainName,
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}
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if option.Config != "" {
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if err := iam.loadS3ApiConfigurationFromFile(option.Config); err != nil {
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glog.Fatalf("fail to load config file %s: %v", option.Config, err)
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}
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} else {
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if err := iam.loadS3ApiConfigurationFromFiler(option); err != nil {
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glog.Warningf("fail to load config: %v", err)
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}
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}
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return iam
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}
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func (iam *IdentityAccessManagement) loadS3ApiConfigurationFromFiler(option *S3ApiServerOption) (err error) {
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var content []byte
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err = pb.WithFilerClient(false, option.Filer, option.GrpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
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content, err = filer.ReadInsideFiler(client, filer.IamConfigDirectory, filer.IamIdentityFile)
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return err
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})
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if err != nil {
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return fmt.Errorf("read S3 config: %v", err)
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}
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return iam.LoadS3ApiConfigurationFromBytes(content)
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}
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func (iam *IdentityAccessManagement) loadS3ApiConfigurationFromFile(fileName string) error {
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content, readErr := os.ReadFile(fileName)
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if readErr != nil {
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glog.Warningf("fail to read %s : %v", fileName, readErr)
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return fmt.Errorf("fail to read %s : %v", fileName, readErr)
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}
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return iam.LoadS3ApiConfigurationFromBytes(content)
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}
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func (iam *IdentityAccessManagement) LoadS3ApiConfigurationFromBytes(content []byte) error {
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s3ApiConfiguration := &iam_pb.S3ApiConfiguration{}
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if err := filer.ParseS3ConfigurationFromBytes(content, s3ApiConfiguration); err != nil {
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glog.Warningf("unmarshal error: %v", err)
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return fmt.Errorf("unmarshal error: %v", err)
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}
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if err := filer.CheckDuplicateAccessKey(s3ApiConfiguration); err != nil {
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return err
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}
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if err := iam.loadS3ApiConfiguration(s3ApiConfiguration); err != nil {
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return err
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}
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return nil
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}
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func (iam *IdentityAccessManagement) loadS3ApiConfiguration(config *iam_pb.S3ApiConfiguration) error {
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var identities []*Identity
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for _, ident := range config.Identities {
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t := &Identity{
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Name: ident.Name,
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Credentials: nil,
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Actions: nil,
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}
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for _, action := range ident.Actions {
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t.Actions = append(t.Actions, Action(action))
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}
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for _, cred := range ident.Credentials {
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t.Credentials = append(t.Credentials, &Credential{
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AccessKey: cred.AccessKey,
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SecretKey: cred.SecretKey,
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})
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}
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identities = append(identities, t)
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}
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iam.m.Lock()
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// atomically switch
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iam.identities = identities
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if !iam.isAuthEnabled { // one-directional, no toggling
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iam.isAuthEnabled = len(identities) > 0
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}
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iam.m.Unlock()
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return nil
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}
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func (iam *IdentityAccessManagement) isEnabled() bool {
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return iam.isAuthEnabled
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}
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func (iam *IdentityAccessManagement) lookupByAccessKey(accessKey string) (identity *Identity, cred *Credential, found bool) {
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iam.m.RLock()
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defer iam.m.RUnlock()
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for _, ident := range iam.identities {
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for _, cred := range ident.Credentials {
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// println("checking", ident.Name, cred.AccessKey)
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if cred.AccessKey == accessKey {
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return ident, cred, true
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}
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}
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}
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glog.V(1).Infof("could not find accessKey %s", accessKey)
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return nil, nil, false
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}
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func (iam *IdentityAccessManagement) lookupAnonymous() (identity *Identity, found bool) {
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iam.m.RLock()
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defer iam.m.RUnlock()
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for _, ident := range iam.identities {
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if ident.Name == "anonymous" {
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return ident, true
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}
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}
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return nil, false
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}
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func (iam *IdentityAccessManagement) Auth(f http.HandlerFunc, action Action) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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if !iam.isEnabled() {
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f(w, r)
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return
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}
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identity, errCode := iam.authRequest(r, action)
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if errCode == s3err.ErrNone {
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if identity != nil && identity.Name != "" {
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r.Header.Set(s3_constants.AmzIdentityId, identity.Name)
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if identity.isAdmin() {
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r.Header.Set(s3_constants.AmzIsAdmin, "true")
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} else if _, ok := r.Header[s3_constants.AmzIsAdmin]; ok {
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r.Header.Del(s3_constants.AmzIsAdmin)
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}
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}
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f(w, r)
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return
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}
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s3err.WriteErrorResponse(w, r, errCode)
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}
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}
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// check whether the request has valid access keys
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func (iam *IdentityAccessManagement) authRequest(r *http.Request, action Action) (*Identity, s3err.ErrorCode) {
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var identity *Identity
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var s3Err s3err.ErrorCode
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var found bool
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var authType string
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switch getRequestAuthType(r) {
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case authTypeStreamingSigned:
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return identity, s3err.ErrNone
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case authTypeUnknown:
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glog.V(3).Infof("unknown auth type")
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r.Header.Set(s3_constants.AmzAuthType, "Unknown")
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return identity, s3err.ErrAccessDenied
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case authTypePresignedV2, authTypeSignedV2:
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glog.V(3).Infof("v2 auth type")
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identity, s3Err = iam.isReqAuthenticatedV2(r)
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authType = "SigV2"
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case authTypeSigned, authTypePresigned:
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glog.V(3).Infof("v4 auth type")
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identity, s3Err = iam.reqSignatureV4Verify(r)
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authType = "SigV4"
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case authTypePostPolicy:
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glog.V(3).Infof("post policy auth type")
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r.Header.Set(s3_constants.AmzAuthType, "PostPolicy")
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return identity, s3err.ErrNone
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case authTypeJWT:
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glog.V(3).Infof("jwt auth type")
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r.Header.Set(s3_constants.AmzAuthType, "Jwt")
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return identity, s3err.ErrNotImplemented
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case authTypeAnonymous:
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authType = "Anonymous"
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identity, found = iam.lookupAnonymous()
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if !found {
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r.Header.Set(s3_constants.AmzAuthType, authType)
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return identity, s3err.ErrAccessDenied
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}
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default:
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return identity, s3err.ErrNotImplemented
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}
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if len(authType) > 0 {
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r.Header.Set(s3_constants.AmzAuthType, authType)
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}
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if s3Err != s3err.ErrNone {
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return identity, s3Err
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}
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glog.V(3).Infof("user name: %v actions: %v, action: %v", identity.Name, identity.Actions, action)
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bucket, object := s3_constants.GetBucketAndObject(r)
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if !identity.canDo(action, bucket, object) {
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return identity, s3err.ErrAccessDenied
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}
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return identity, s3err.ErrNone
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}
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func (iam *IdentityAccessManagement) authUser(r *http.Request) (*Identity, s3err.ErrorCode) {
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var identity *Identity
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var s3Err s3err.ErrorCode
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var found bool
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var authType string
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switch getRequestAuthType(r) {
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case authTypeStreamingSigned:
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return identity, s3err.ErrNone
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case authTypeUnknown:
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glog.V(3).Infof("unknown auth type")
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r.Header.Set(s3_constants.AmzAuthType, "Unknown")
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return identity, s3err.ErrAccessDenied
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case authTypePresignedV2, authTypeSignedV2:
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glog.V(3).Infof("v2 auth type")
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identity, s3Err = iam.isReqAuthenticatedV2(r)
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authType = "SigV2"
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case authTypeSigned, authTypePresigned:
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glog.V(3).Infof("v4 auth type")
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identity, s3Err = iam.reqSignatureV4Verify(r)
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authType = "SigV4"
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case authTypePostPolicy:
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glog.V(3).Infof("post policy auth type")
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r.Header.Set(s3_constants.AmzAuthType, "PostPolicy")
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return identity, s3err.ErrNone
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case authTypeJWT:
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glog.V(3).Infof("jwt auth type")
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r.Header.Set(s3_constants.AmzAuthType, "Jwt")
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return identity, s3err.ErrNotImplemented
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case authTypeAnonymous:
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authType = "Anonymous"
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identity, found = iam.lookupAnonymous()
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if !found {
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r.Header.Set(s3_constants.AmzAuthType, authType)
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return identity, s3err.ErrAccessDenied
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}
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default:
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return identity, s3err.ErrNotImplemented
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}
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if len(authType) > 0 {
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r.Header.Set(s3_constants.AmzAuthType, authType)
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}
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glog.V(3).Infof("auth error: %v", s3Err)
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if s3Err != s3err.ErrNone {
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return identity, s3Err
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}
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return identity, s3err.ErrNone
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}
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func (identity *Identity) canDo(action Action, bucket string, objectKey string) bool {
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if identity.isAdmin() {
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return true
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}
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for _, a := range identity.Actions {
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if a == action {
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return true
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}
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}
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if bucket == "" {
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return false
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}
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target := string(action) + ":" + bucket + objectKey
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adminTarget := s3_constants.ACTION_ADMIN + ":" + bucket + objectKey
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limitedByBucket := string(action) + ":" + bucket
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adminLimitedByBucket := s3_constants.ACTION_ADMIN + ":" + bucket
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for _, a := range identity.Actions {
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act := string(a)
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if strings.HasSuffix(act, "*") {
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if strings.HasPrefix(target, act[:len(act)-1]) {
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return true
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}
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if strings.HasPrefix(adminTarget, act[:len(act)-1]) {
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return true
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}
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} else {
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if act == limitedByBucket {
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return true
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}
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if act == adminLimitedByBucket {
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return true
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}
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}
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}
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return false
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}
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func (identity *Identity) isAdmin() bool {
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for _, a := range identity.Actions {
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if a == "Admin" {
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return true
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}
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}
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return false
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}
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