[#190] Add POST object

Signed-off-by: Denis Kirillov <denis@nspcc.ru>
This commit is contained in:
Denis Kirillov 2021-08-30 22:44:53 +03:00 committed by Alex Vanin
parent b2bf81cec7
commit 42ed6a16ea
7 changed files with 560 additions and 52 deletions

View file

@ -2,9 +2,13 @@ package auth
import (
"context"
"crypto/hmac"
"crypto/sha256"
"encoding/hex"
"errors"
"fmt"
"io"
"mime/multipart"
"net/http"
"regexp"
"strings"
@ -24,6 +28,9 @@ import (
// authorizationFieldRegexp -- is regexp for credentials with Base58 encoded cid and oid and '0' (zero) as delimiter.
var authorizationFieldRegexp = regexp.MustCompile(`AWS4-HMAC-SHA256 Credential=(?P<access_key_id>[^/]+)/(?P<date>[^/]+)/(?P<region>[^/]*)/(?P<service>[^/]+)/aws4_request,\s*SignedHeaders=(?P<signed_header_fields>.+),\s*Signature=(?P<v4_signature>.+)`)
// postPolicyCredentialRegexp -- is regexp for credentials when uploading file using POST with policy.
var postPolicyCredentialRegexp = regexp.MustCompile(`(?P<access_key_id>[^/]+)/(?P<date>[^/]+)/(?P<region>[^/]*)/(?P<service>[^/]+)/aws4_request`)
type (
// Center is a user authentication interface.
Center interface {
@ -32,6 +39,7 @@ type (
center struct {
reg *regexpSubmatcher
postReg *regexpSubmatcher
cli tokens.Credentials
}
@ -56,6 +64,7 @@ type (
const (
accessKeyPartsNum = 2
authHeaderPartsNum = 6
maxFormSizeMemory = 50 * 1048576 // 50 MB
)
// ErrNoAuthorizationHeader is returned for unauthenticated requests.
@ -76,6 +85,7 @@ func New(conns pool.Pool, key *keys.PrivateKey) Center {
return &center{
cli: tokens.New(conns, key),
reg: &regexpSubmatcher{re: authorizationFieldRegexp},
postReg: &regexpSubmatcher{re: postPolicyCredentialRegexp},
}
}
@ -118,6 +128,9 @@ func (c *center) Authenticate(r *http.Request) (*accessbox.Box, error) {
authHeaderField := r.Header["Authorization"]
if len(authHeaderField) != 1 {
if strings.HasPrefix(r.Header.Get("Content-Type"), "multipart/form-data") {
return c.checkFormData(r)
}
return nil, ErrNoAuthorizationHeader
}
@ -149,6 +162,51 @@ func (c *center) Authenticate(r *http.Request) (*accessbox.Box, error) {
return box, nil
}
func (c *center) checkFormData(r *http.Request) (*accessbox.Box, error) {
if err := r.ParseMultipartForm(maxFormSizeMemory); err != nil {
return nil, apiErrors.GetAPIError(apiErrors.ErrInvalidArgument)
}
if err := prepareForm(r.MultipartForm); err != nil {
return nil, fmt.Errorf("couldn't parse form: %w", err)
}
policy := MultipartFormValue(r, "policy")
if policy == "" {
return nil, ErrNoAuthorizationHeader
}
submatches := c.postReg.getSubmatches(MultipartFormValue(r, "x-amz-credential"))
if len(submatches) != 4 {
return nil, apiErrors.GetAPIError(apiErrors.ErrAuthorizationHeaderMalformed)
}
signatureDateTime, err := time.Parse("20060102T150405Z", MultipartFormValue(r, "x-amz-date"))
if err != nil {
return nil, fmt.Errorf("failed to parse x-amz-date field: %w", err)
}
address := object.NewAddress()
if err = address.Parse(strings.ReplaceAll(submatches["access_key_id"], "0", "/")); err != nil {
return nil, apiErrors.GetAPIError(apiErrors.ErrInvalidAccessKeyID)
}
box, err := c.cli.GetBox(r.Context(), address)
if err != nil {
return nil, err
}
secret := box.Gate.AccessKey
service, region := submatches["service"], submatches["region"]
signature := signStr(secret, service, region, signatureDateTime, policy)
if signature != MultipartFormValue(r, "x-amz-signature") {
return nil, apiErrors.GetAPIError(apiErrors.ErrSignatureDoesNotMatch)
}
return box, nil
}
func cloneRequest(r *http.Request, authHeader *authHeader) *http.Request {
otherRequest := r.Clone(context.TODO())
otherRequest.Header = make(http.Header)
@ -181,3 +239,77 @@ func (c *center) checkSign(authHeader *authHeader, box *accessbox.Box, request *
return nil
}
func signStr(secret, service, region string, t time.Time, strToSign string) string {
creds := deriveKey(secret, service, region, t)
signature := hmacSHA256(creds, []byte(strToSign))
return hex.EncodeToString(signature)
}
func deriveKey(secret, service, region string, t time.Time) []byte {
hmacDate := hmacSHA256([]byte("AWS4"+secret), []byte(t.UTC().Format("20060102")))
hmacRegion := hmacSHA256(hmacDate, []byte(region))
hmacService := hmacSHA256(hmacRegion, []byte(service))
return hmacSHA256(hmacService, []byte("aws4_request"))
}
func hmacSHA256(key []byte, data []byte) []byte {
hash := hmac.New(sha256.New, key)
hash.Write(data)
return hash.Sum(nil)
}
// MultipartFormValue get value by key from multipart form.
func MultipartFormValue(r *http.Request, key string) string {
if r.MultipartForm == nil {
return ""
}
if vs := r.MultipartForm.Value[key]; len(vs) > 0 {
return vs[0]
}
return ""
}
func prepareForm(form *multipart.Form) error {
var oldKeysValue []string
var oldKeysFile []string
for k, v := range form.Value {
lowerKey := strings.ToLower(k)
if lowerKey != k {
form.Value[lowerKey] = v
oldKeysValue = append(oldKeysValue, k)
}
}
for _, k := range oldKeysValue {
delete(form.Value, k)
}
for k, v := range form.File {
lowerKey := strings.ToLower(k)
if lowerKey != "file" {
oldKeysFile = append(oldKeysFile, k)
if len(v) > 0 {
field, err := v[0].Open()
if err != nil {
return err
}
data, err := io.ReadAll(field)
if err != nil {
return err
}
form.Value[lowerKey] = []string{string(data)}
}
} else if lowerKey != k {
form.File[lowerKey] = v
oldKeysFile = append(oldKeysFile, k)
}
}
for _, k := range oldKeysFile {
delete(form.File, k)
}
return nil
}

View file

@ -3,6 +3,7 @@ package auth
import (
"strings"
"testing"
"time"
"github.com/nspcc-dev/neofs-s3-gw/api/errors"
"github.com/stretchr/testify/require"
@ -85,3 +86,16 @@ func TestAuthHeaderGetAddress(t *testing.T) {
require.Equal(t, tc.err, err, tc.authHeader.AccessKeyID)
}
}
func TestSignature(t *testing.T) {
secret := "66be461c3cd429941c55daf42fad2b8153e5a2016ba89c9494d97677cc9d3872"
strToSign := "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"
signTime, err := time.Parse("20060102T150405Z", "20151229T000000Z")
if err != nil {
panic(err)
}
signature := signStr(secret, "s3", "us-east-1", signTime, strToSign)
require.Equal(t, "dfbe886241d9e369cf4b329ca0f15eb27306c97aa1022cc0bb5a914c4ef87634", signature)
}

View file

@ -1,19 +1,159 @@
package handler
import (
"bytes"
"encoding/base64"
"encoding/json"
"encoding/xml"
"fmt"
"io"
"net"
"net/http"
"net/url"
"strconv"
"strings"
"time"
"github.com/nspcc-dev/neofs-api-go/pkg/acl/eacl"
"github.com/nspcc-dev/neofs-s3-gw/api"
"github.com/nspcc-dev/neofs-s3-gw/api/auth"
"github.com/nspcc-dev/neofs-s3-gw/api/errors"
"github.com/nspcc-dev/neofs-s3-gw/api/layer"
"go.uber.org/zap"
)
type postPolicy struct {
Expiration time.Time `json:"expiration"`
Conditions []*policyCondition `json:"conditions"`
empty bool
}
func (p *postPolicy) condition(key string) *policyCondition {
for _, condition := range p.Conditions {
if condition.Key == key {
return condition
}
}
return nil
}
func (p *postPolicy) CheckContentLength(size int64) bool {
if p.empty {
return true
}
for _, condition := range p.Conditions {
if condition.Matching == "content-length-range" {
length := strconv.FormatInt(size, 10)
return condition.Key <= length && length <= condition.Value
}
}
return true
}
func (p *policyCondition) match(value string) bool {
switch p.Matching {
case "eq":
p.Matched = p.Value == value
case "starts-with":
if p.Key == api.ContentType {
p.Matched = true
for _, contentType := range strings.Split(value, ",") {
if !strings.HasPrefix(contentType, p.Value) {
p.Matched = false
}
}
} else {
p.Matched = strings.HasPrefix(value, p.Value)
}
}
return p.Matched
}
func (p *postPolicy) CheckField(key string, value string) error {
if p.empty {
return nil
}
cond := p.condition(key)
if cond == nil {
return errors.GetAPIError(errors.ErrPostPolicyConditionInvalidFormat)
}
if !cond.match(value) {
return errors.GetAPIError(errors.ErrPostPolicyConditionInvalidFormat)
}
return nil
}
func (p *postPolicy) AllConditionMatched() bool {
for _, condition := range p.Conditions {
if !condition.Matched {
return false
}
}
return true
}
type policyCondition struct {
Matching string
Key string
Value string
Matched bool
}
var errInvalidCondition = fmt.Errorf("invalid condition")
func (p *policyCondition) UnmarshalJSON(data []byte) error {
var (
ok bool
v interface{}
)
if err := json.Unmarshal(data, &v); err != nil {
return err
}
switch v := v.(type) {
case []interface{}:
if len(v) != 3 {
return errInvalidCondition
}
if p.Matching, ok = v[0].(string); !ok {
return errInvalidCondition
}
if p.Matching == "content-length-range" {
min, ok := v[1].(float64)
max, ok2 := v[2].(float64)
if !ok || !ok2 {
return errInvalidCondition
}
p.Key = strconv.FormatFloat(min, 'f', 0, 32)
p.Value = strconv.FormatFloat(max, 'f', 0, 32)
} else {
key, ok2 := v[1].(string)
p.Value, ok = v[2].(string)
if !ok || !ok2 {
return errInvalidCondition
}
p.Key = strings.ToLower(strings.TrimPrefix(key, "$"))
}
case map[string]interface{}:
p.Matching = "eq"
for key, val := range v {
p.Key = strings.ToLower(key)
if p.Value, ok = val.(string); !ok {
return errInvalidCondition
}
}
default:
return fmt.Errorf("unknown condition type")
}
return nil
}
// keywords of predefined basic ACL values.
const (
basicACLPrivate = "private"
@ -68,49 +208,10 @@ func (h *handler) PutObjectHandler(w http.ResponseWriter, r *http.Request) {
}
if containsACLHeaders(r) {
objectACL, err := parseACLHeaders(r)
if err != nil {
h.logAndSendError(w, "could not parse object acl", reqInfo, err)
if newEaclTable, err = h.getNewEAclTable(r, info); err != nil {
h.logAndSendError(w, "could not get new eacl table", reqInfo, err)
return
}
resInfo := &resourceInfo{
Bucket: reqInfo.BucketName,
Object: reqInfo.ObjectName,
Version: info.Version(),
}
bktPolicy, err := aclToPolicy(objectACL, resInfo)
if err != nil {
h.logAndSendError(w, "could not translate object acl to bucket policy", reqInfo, err)
return
}
astChild, err := policyToAst(bktPolicy)
if err != nil {
h.logAndSendError(w, "could not translate policy to ast", reqInfo, err)
return
}
bacl, err := h.obj.GetBucketACL(r.Context(), reqInfo.BucketName)
if err != nil {
h.logAndSendError(w, "could not get bucket eacl", reqInfo, err)
return
}
parentAst := tableToAst(bacl.EACL, reqInfo.BucketName)
for _, resource := range parentAst.Resources {
if resource.Bucket == bacl.Info.CID.String() {
resource.Bucket = reqInfo.BucketName
}
}
if resAst, updated := mergeAst(parentAst, astChild); updated {
if newEaclTable, err = astToTable(resAst); err != nil {
h.logAndSendError(w, "could not translate ast to table", reqInfo, err)
return
}
}
}
if tagSet != nil {
@ -142,11 +243,226 @@ func (h *handler) PutObjectHandler(w http.ResponseWriter, r *http.Request) {
api.WriteSuccessResponseHeadersOnly(w)
}
func (h *handler) PostObject(w http.ResponseWriter, r *http.Request) {
var (
newEaclTable *eacl.Table
tagSet map[string]string
reqInfo = api.GetReqInfo(r.Context())
metadata = make(map[string]string)
)
policy, err := checkPostPolicy(r, reqInfo, metadata)
if err != nil {
h.logAndSendError(w, "failed check policy", reqInfo, err)
return
}
if tagging := auth.MultipartFormValue(r, "tagging"); tagging != "" {
buffer := bytes.NewBufferString(tagging)
tagSet, err = readTagSet(buffer)
if err != nil {
h.logAndSendError(w, "could not read tag set", reqInfo, err)
return
}
}
var contentReader io.Reader
var size int64
if content, ok := r.MultipartForm.Value["file"]; ok {
contentReader = bytes.NewBufferString(content[0])
size = int64(len(content[0]))
} else {
file, head, err := r.FormFile("file")
if err != nil {
h.logAndSendError(w, "could get uploading file", reqInfo, err)
return
}
contentReader = file
size = head.Size
reqInfo.ObjectName = strings.ReplaceAll(reqInfo.ObjectName, "${filename}", head.Filename)
}
if !policy.CheckContentLength(size) {
h.logAndSendError(w, "invalid content-length", reqInfo, errors.GetAPIError(errors.ErrInvalidArgument))
return
}
params := &layer.PutObjectParams{
Bucket: reqInfo.BucketName,
Object: reqInfo.ObjectName,
Reader: contentReader,
Size: size,
Header: metadata,
}
info, err := h.obj.PutObject(r.Context(), params)
if err != nil {
h.logAndSendError(w, "could not upload object", reqInfo, err)
return
}
if acl := auth.MultipartFormValue(r, "acl"); acl != "" {
r.Header.Set(api.AmzACL, acl)
r.Header.Set(api.AmzGrantFullControl, "")
r.Header.Set(api.AmzGrantWrite, "")
r.Header.Set(api.AmzGrantRead, "")
if newEaclTable, err = h.getNewEAclTable(r, info); err != nil {
h.logAndSendError(w, "could not get new eacl table", reqInfo, err)
return
}
}
if tagSet != nil {
if err = h.obj.PutObjectTagging(r.Context(), &layer.PutTaggingParams{ObjectInfo: info, TagSet: tagSet}); err != nil {
h.logAndSendError(w, "could not upload object tagging", reqInfo, err)
return
}
}
if newEaclTable != nil {
p := &layer.PutBucketACLParams{
Name: reqInfo.BucketName,
EACL: newEaclTable,
}
if err = h.obj.PutBucketACL(r.Context(), p); err != nil {
h.logAndSendError(w, "could not put bucket acl", reqInfo, err)
return
}
}
if versioning, err := h.obj.GetBucketVersioning(r.Context(), reqInfo.BucketName); err != nil {
h.log.Warn("couldn't get bucket versioning", zap.String("bucket name", reqInfo.BucketName), zap.Error(err))
} else if versioning.VersioningEnabled {
w.Header().Set(api.AmzVersionID, info.Version())
}
if redirectURL := auth.MultipartFormValue(r, "success_action_redirect"); redirectURL != "" {
http.Redirect(w, r, redirectURL, http.StatusTemporaryRedirect)
return
}
status := http.StatusNoContent
if statusStr := auth.MultipartFormValue(r, "success_action_status"); statusStr != "" {
switch statusStr {
case "200":
status = http.StatusOK
case "201":
status = http.StatusCreated
resp := &PostResponse{
Bucket: info.Bucket,
Key: info.Name,
ETag: info.HashSum,
}
w.WriteHeader(status)
if _, err = w.Write(api.EncodeResponse(resp)); err != nil {
h.logAndSendError(w, "something went wrong", reqInfo, err)
}
return
}
}
w.Header().Set(api.ETag, info.HashSum)
w.WriteHeader(status)
}
func checkPostPolicy(r *http.Request, reqInfo *api.ReqInfo, metadata map[string]string) (*postPolicy, error) {
policy := &postPolicy{}
if policyStr := auth.MultipartFormValue(r, "policy"); policyStr != "" {
policyData, err := base64.StdEncoding.DecodeString(policyStr)
if err != nil {
return nil, fmt.Errorf("could not decode policy: %w", err)
}
if err = json.Unmarshal(policyData, policy); err != nil {
return nil, fmt.Errorf("could not unmarshal policy: %w", err)
}
if policy.Expiration.Before(time.Now()) {
return nil, fmt.Errorf("policy is expired: %w", errors.GetAPIError(errors.ErrInvalidArgument))
}
}
for key, v := range r.MultipartForm.Value {
value := v[0]
if key == "file" || key == "policy" || key == "x-amz-signature" || strings.HasPrefix(key, "x-ignore-") {
continue
}
if err := policy.CheckField(key, value); err != nil {
return nil, fmt.Errorf("'%s' form field doesn't match the policy: %w", key, err)
}
prefix := strings.ToLower(api.MetadataPrefix)
if strings.HasPrefix(key, prefix) {
metadata[strings.TrimPrefix(key, prefix)] = value
}
if key == "content-type" {
metadata[api.ContentType] = value
}
if key == "key" {
reqInfo.ObjectName = value
}
}
for _, cond := range policy.Conditions {
if cond.Key == "bucket" {
if !cond.match(reqInfo.BucketName) {
return nil, errors.GetAPIError(errors.ErrPostPolicyConditionInvalidFormat)
}
}
}
return policy, nil
}
func containsACLHeaders(r *http.Request) bool {
return r.Header.Get(api.AmzACL) != "" || r.Header.Get(api.AmzGrantRead) != "" ||
r.Header.Get(api.AmzGrantFullControl) != "" || r.Header.Get(api.AmzGrantWrite) != ""
}
func (h *handler) getNewEAclTable(r *http.Request, objInfo *layer.ObjectInfo) (*eacl.Table, error) {
var newEaclTable *eacl.Table
objectACL, err := parseACLHeaders(r)
if err != nil {
return nil, fmt.Errorf("could not parse object acl: %w", err)
}
resInfo := &resourceInfo{
Bucket: objInfo.Bucket,
Object: objInfo.Name,
Version: objInfo.Version(),
}
bktPolicy, err := aclToPolicy(objectACL, resInfo)
if err != nil {
return nil, fmt.Errorf("could not translate object acl to bucket policy: %w", err)
}
astChild, err := policyToAst(bktPolicy)
if err != nil {
return nil, fmt.Errorf("could not translate policy to ast: %w", err)
}
bacl, err := h.obj.GetBucketACL(r.Context(), objInfo.Bucket)
if err != nil {
return nil, fmt.Errorf("could not get bucket eacl: %w", err)
}
parentAst := tableToAst(bacl.EACL, objInfo.Bucket)
for _, resource := range parentAst.Resources {
if resource.Bucket == bacl.Info.CID.String() {
resource.Bucket = objInfo.Bucket
}
}
if resAst, updated := mergeAst(parentAst, astChild); updated {
if newEaclTable, err = astToTable(resAst); err != nil {
return nil, fmt.Errorf("could not translate ast to table: %w", err)
}
}
return newEaclTable, nil
}
func parseTaggingHeader(header http.Header) (map[string]string, error) {
var tagSet map[string]string
if tagging := header.Get(api.AmzTagging); len(tagging) > 0 {

View file

@ -1,7 +1,9 @@
package handler
import (
"encoding/json"
"testing"
"time"
"github.com/stretchr/testify/require"
)
@ -43,3 +45,44 @@ func TestCheckBucketName(t *testing.T) {
}
}
}
func TestCustomJSONMarshal(t *testing.T) {
data := []byte(`
{ "expiration": "2015-12-30T12:00:00.000Z",
"conditions": [
["content-length-range", 1048576, 10485760],
{"bucket": "bucketName"},
["starts-with", "$key", "user/user1/"]
]
}`)
parsedTime, err := time.Parse(time.RFC3339, "2015-12-30T12:00:00.000Z")
require.NoError(t, err)
expectedPolicy := &postPolicy{
Expiration: parsedTime,
Conditions: []*policyCondition{
{
Matching: "content-length-range",
Key: "1048576",
Value: "10485760",
},
{
Matching: "eq",
Key: "bucket",
Value: "bucketName",
},
{
Matching: "starts-with",
Key: "key",
Value: "user/user1/",
},
},
}
policy := &postPolicy{}
err = json.Unmarshal(data, policy)
require.NoError(t, err)
require.Equal(t, expectedPolicy, policy)
}

View file

@ -175,6 +175,13 @@ type Tagging struct {
TagSet []Tag `xml:"TagSet>Tag"`
}
// PostResponse contains result of posting object.
type PostResponse struct {
Bucket string `xml:"Bucket"`
Key string `xml:"Key"`
ETag string `xml:"Etag"`
}
// Tag is AWS key-value tag.
type Tag struct {
Key string

View file

@ -114,7 +114,3 @@ func (h *handler) PutBucketEncryptionHandler(w http.ResponseWriter, r *http.Requ
func (h *handler) PutBucketObjectLockConfigHandler(w http.ResponseWriter, r *http.Request) {
h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
}
func (h *handler) PostPolicyBucketHandler(w http.ResponseWriter, r *http.Request) {
h.logAndSendError(w, "not implemented", api.GetReqInfo(r.Context()), errors.GetAPIError(errors.ErrNotImplemented))
}

View file

@ -70,7 +70,7 @@ type (
PutBucketNotificationHandler(http.ResponseWriter, *http.Request)
CreateBucketHandler(http.ResponseWriter, *http.Request)
HeadBucketHandler(http.ResponseWriter, *http.Request)
PostPolicyBucketHandler(http.ResponseWriter, *http.Request)
PostObject(http.ResponseWriter, *http.Request)
DeleteMultipleObjectsHandler(http.ResponseWriter, *http.Request)
DeleteBucketPolicyHandler(http.ResponseWriter, *http.Request)
DeleteBucketLifecycleHandler(http.ResponseWriter, *http.Request)
@ -422,8 +422,8 @@ func Attach(r *mux.Router, domains []string, m MaxClients, h Handler, center aut
Name("HeadBucket")
// PostPolicy
bucket.Methods(http.MethodPost).HeadersRegexp(hdrContentType, "multipart/form-data*").HandlerFunc(
m.Handle(metrics.APIStats("postpolicybucket", h.PostPolicyBucketHandler))).
Name("PostPolicyBucket")
m.Handle(metrics.APIStats("postobject", h.PostObject))).
Name("PostObject")
// DeleteMultipleObjects
bucket.Methods(http.MethodPost).HandlerFunc(
m.Handle(metrics.APIStats("deletemultipleobjects", h.DeleteMultipleObjectsHandler))).Queries("delete", "").