seaweedfs/weed/s3api/auth_credentials.go

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