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package s3api
import (
"fmt"
"github.com/chrislusf/seaweedfs/weed/filer"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/pb/iam_pb"
xhttp "github.com/chrislusf/seaweedfs/weed/s3api/http"
"github.com/chrislusf/seaweedfs/weed/s3api/s3_constants"
"github.com/chrislusf/seaweedfs/weed/s3api/s3err"
"io/ioutil"
"net/http"
"strings"
)
type Action string
type Iam interface {
Check(f http.HandlerFunc, actions ...Action) http.HandlerFunc
}
type IdentityAccessManagement struct {
identities []*Identity
domain string
}
type Identity struct {
Name string
Credentials []*Credential
Actions []Action
}
type Credential struct {
AccessKey string
SecretKey string
}
func (action Action) isAdmin() bool {
return strings.HasPrefix(string(action), s3_constants.ACTION_ADMIN)
}
func (action Action) isOwner(bucket string) bool {
return string(action) == s3_constants.ACTION_ADMIN+":"+bucket
}
func (action Action) overBucket(bucket string) bool {
return strings.HasSuffix(string(action), ":"+bucket) || strings.HasSuffix(string(action), ":*")
}
func (action Action) getPermission() Permission {
switch act := strings.Split(string(action), ":")[0]; act {
case s3_constants.ACTION_ADMIN:
return Permission("FULL_CONTROL")
case s3_constants.ACTION_WRITE:
return Permission("WRITE")
case s3_constants.ACTION_READ:
return Permission("READ")
default:
return Permission("")
}
}
func NewIdentityAccessManagement(option *S3ApiServerOption) *IdentityAccessManagement {
iam := &IdentityAccessManagement{
domain: option.DomainName,
}
if option.Config != "" {
if err := iam.loadS3ApiConfigurationFromFile(option.Config); err != nil {
glog.Fatalf("fail to load config file %s: %v", option.Config, err)
}
} else {
if err := iam.loadS3ApiConfigurationFromFiler(option); err != nil {
glog.Warningf("fail to load config: %v", err)
}
}
return iam
}
func (iam *IdentityAccessManagement) loadS3ApiConfigurationFromFiler(option *S3ApiServerOption) (err error) {
var content []byte
err = pb.WithFilerClient(option.Filer, option.GrpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
content, err = filer.ReadInsideFiler(client, filer.IamConfigDirecotry, filer.IamIdentityFile)
return err
})
if err != nil {
return fmt.Errorf("read S3 config: %v", err)
}
return iam.loadS3ApiConfigurationFromBytes(content)
}
func (iam *IdentityAccessManagement) loadS3ApiConfigurationFromFile(fileName string) error {
content, readErr := ioutil.ReadFile(fileName)
if readErr != nil {
glog.Warningf("fail to read %s : %v", fileName, readErr)
return fmt.Errorf("fail to read %s : %v", fileName, readErr)
}
return iam.loadS3ApiConfigurationFromBytes(content)
}
func (iam *IdentityAccessManagement) loadS3ApiConfigurationFromBytes(content []byte) error {
s3ApiConfiguration := &iam_pb.S3ApiConfiguration{}
if err := filer.ParseS3ConfigurationFromBytes(content, s3ApiConfiguration); err != nil {
glog.Warningf("unmarshal error: %v", err)
return fmt.Errorf("unmarshal error: %v", err)
}
if err := iam.loadS3ApiConfiguration(s3ApiConfiguration); err != nil {
return err
}
return nil
}
func (iam *IdentityAccessManagement) loadS3ApiConfiguration(config *iam_pb.S3ApiConfiguration) error {
var identities []*Identity
for _, ident := range config.Identities {
t := &Identity{
Name: ident.Name,
Credentials: nil,
Actions: nil,
}
for _, action := range ident.Actions {
t.Actions = append(t.Actions, Action(action))
}
for _, cred := range ident.Credentials {
t.Credentials = append(t.Credentials, &Credential{
AccessKey: cred.AccessKey,
SecretKey: cred.SecretKey,
})
}
identities = append(identities, t)
}
// atomically switch
iam.identities = identities
return nil
}
func (iam *IdentityAccessManagement) isEnabled() bool {
return len(iam.identities) > 0
}
func (iam *IdentityAccessManagement) lookupByAccessKey(accessKey string) (identity *Identity, cred *Credential, found bool) {
for _, ident := range iam.identities {
for _, cred := range ident.Credentials {
if cred.AccessKey == accessKey {
return ident, cred, true
}
}
}
return nil, nil, false
}
func (iam *IdentityAccessManagement) lookupAnonymous() (identity *Identity, found bool) {
for _, ident := range iam.identities {
if ident.Name == "anonymous" {
return ident, true
}
}
return nil, false
}
func (iam *IdentityAccessManagement) Auth(f http.HandlerFunc, action Action) http.HandlerFunc {
if !iam.isEnabled() {
return f
}
return func(w http.ResponseWriter, r *http.Request) {
identity, errCode := iam.authRequest(r, action)
if errCode == s3err.ErrNone {
if identity != nil && identity.Name != "" {
r.Header.Set(xhttp.AmzIdentityId, identity.Name)
if identity.isAdmin() {
r.Header.Set(xhttp.AmzIsAdmin, "true")
}
}
f(w, r)
return
}
s3err.WriteErrorResponse(w, errCode, r)
}
}
// check whether the request has valid access keys
func (iam *IdentityAccessManagement) authRequest(r *http.Request, action Action) (*Identity, s3err.ErrorCode) {
var identity *Identity
var s3Err s3err.ErrorCode
var found bool
switch getRequestAuthType(r) {
case authTypeStreamingSigned:
return identity, s3err.ErrNone
case authTypeUnknown:
glog.V(3).Infof("unknown auth type")
return identity, s3err.ErrAccessDenied
case authTypePresignedV2, authTypeSignedV2:
glog.V(3).Infof("v2 auth type")
identity, s3Err = iam.isReqAuthenticatedV2(r)
case authTypeSigned, authTypePresigned:
glog.V(3).Infof("v4 auth type")
identity, s3Err = iam.reqSignatureV4Verify(r)
case authTypePostPolicy:
glog.V(3).Infof("post policy auth type")
return identity, s3err.ErrNone
case authTypeJWT:
glog.V(3).Infof("jwt auth type")
return identity, s3err.ErrNotImplemented
case authTypeAnonymous:
identity, found = iam.lookupAnonymous()
if !found {
return identity, s3err.ErrAccessDenied
}
default:
return identity, s3err.ErrNotImplemented
}
if s3Err != s3err.ErrNone {
return identity, s3Err
}
glog.V(3).Infof("user name: %v actions: %v, action: %v", identity.Name, identity.Actions, action)
bucket, _ := getBucketAndObject(r)
if !identity.canDo(action, bucket) {
return identity, s3err.ErrAccessDenied
}
return identity, s3err.ErrNone
}
func (iam *IdentityAccessManagement) authUser(r *http.Request) (*Identity, s3err.ErrorCode) {
var identity *Identity
var s3Err s3err.ErrorCode
var found bool
switch getRequestAuthType(r) {
case authTypeStreamingSigned:
return identity, s3err.ErrNone
case authTypeUnknown:
glog.V(3).Infof("unknown auth type")
return identity, s3err.ErrAccessDenied
case authTypePresignedV2, authTypeSignedV2:
glog.V(3).Infof("v2 auth type")
identity, s3Err = iam.isReqAuthenticatedV2(r)
case authTypeSigned, authTypePresigned:
glog.V(3).Infof("v4 auth type")
identity, s3Err = iam.reqSignatureV4Verify(r)
case authTypePostPolicy:
glog.V(3).Infof("post policy auth type")
return identity, s3err.ErrNone
case authTypeJWT:
glog.V(3).Infof("jwt auth type")
return identity, s3err.ErrNotImplemented
case authTypeAnonymous:
identity, found = iam.lookupAnonymous()
if !found {
return identity, s3err.ErrAccessDenied
}
default:
return identity, s3err.ErrNotImplemented
}
glog.V(3).Infof("auth error: %v", s3Err)
if s3Err != s3err.ErrNone {
return identity, s3Err
}
return identity, s3err.ErrNone
}
func (identity *Identity) canDo(action Action, bucket string) bool {
if identity.isAdmin() {
return true
}
for _, a := range identity.Actions {
if a == action {
return true
}
}
if bucket == "" {
return false
}
limitedByBucket := string(action) + ":" + bucket
adminLimitedByBucket := s3_constants.ACTION_ADMIN + ":" + bucket
for _, a := range identity.Actions {
act := string(a)
if strings.HasSuffix(act, "*") {
if strings.HasPrefix(limitedByBucket, act[:len(act)-1]) {
return true
}
if strings.HasPrefix(adminLimitedByBucket, act[:len(act)-1]) {
return true
}
} else {
if act == limitedByBucket {
return true
}
if act == adminLimitedByBucket {
return true
}
}
}
return false
}
func (identity *Identity) isAdmin() bool {
for _, a := range identity.Actions {
if a == "Admin" {
return true
}
}
return false
}
|
