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package s3api
import (
"bytes"
"fmt"
"io/ioutil"
"net/http"
"github.com/golang/protobuf/jsonpb"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb/iam_pb"
)
type Action string
const (
ACTION_READ = "Read"
ACTION_WRITE = "Write"
ACTION_ADMIN = "Admin"
)
type Iam interface {
Check(f http.HandlerFunc, actions ...Action) http.HandlerFunc
}
type IdentityAccessManagement struct {
identities []*Identity
}
type Identity struct {
Name string
Credentials []*Credential
Actions []Action
}
type Credential struct {
AccessKey string
SecretKey string
}
func NewIdentityAccessManagement(fileName string) *IdentityAccessManagement {
iam := &IdentityAccessManagement{}
if fileName == "" {
return iam
}
if err := iam.loadIdentities(fileName); err != nil {
glog.Fatalf("fail to load config file %s: %v", fileName, err)
}
return iam
}
func (iam *IdentityAccessManagement) loadIdentities(fileName string) error {
identities := &iam_pb.Identities{}
rawData, 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)
}
glog.V(1).Infof("maybeLoadVolumeInfo Unmarshal volume info %v", fileName)
if err := jsonpb.Unmarshal(bytes.NewReader(rawData), identities); err != nil {
glog.Warningf("unmarshal error: %v", err)
return fmt.Errorf("unmarshal %s error: %v", fileName, err)
}
for _, ident := range identities.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,
})
}
iam.identities = append(iam.identities, t)
}
return nil
}
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) Auth(f http.HandlerFunc, actions ...Action) http.HandlerFunc {
if len(iam.identities) == 0 {
return f
}
return func(w http.ResponseWriter, r *http.Request) {
errCode := iam.authRequest(r, actions)
if errCode == ErrNone {
f(w, r)
return
}
writeErrorResponse(w, errCode, r.URL)
}
}
// check whether the request has valid access keys
func (iam *IdentityAccessManagement) authRequest(r *http.Request, actions []Action) ErrorCode {
var identity *Identity
var s3Err ErrorCode
switch getRequestAuthType(r) {
case authTypeUnknown, authTypeStreamingSigned:
return ErrAccessDenied
case authTypePresignedV2, authTypeSignedV2:
return ErrNotImplemented
case authTypeSigned, authTypePresigned:
identity, s3Err = iam.reqSignatureV4Verify(r)
if s3Err != ErrNone {
return s3Err
}
}
if !identity.canDo(actions) {
return ErrAccessDenied
}
return ErrNone
}
func (identity *Identity) canDo(actions []Action) bool {
for _, a := range identity.Actions {
for _, b := range actions {
if a == b {
return true
}
}
}
return false
}
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