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694 lines
20 KiB
694 lines
20 KiB
// Copyright 2020 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package lfs
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import (
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"encoding/base64"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"path"
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"regexp"
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"strconv"
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"strings"
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"time"
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"code.gitea.io/gitea/models"
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"code.gitea.io/gitea/modules/context"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/storage"
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"gitea.com/macaron/macaron"
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"github.com/dgrijalva/jwt-go"
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)
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const (
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metaMediaType = "application/vnd.git-lfs+json"
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)
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// RequestVars contain variables from the HTTP request. Variables from routing, json body decoding, and
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// some headers are stored.
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type RequestVars struct {
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Oid string
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Size int64
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User string
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Password string
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Repo string
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Authorization string
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}
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// BatchVars contains multiple RequestVars processed in one batch operation.
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// https://github.com/git-lfs/git-lfs/blob/master/docs/api/batch.md
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type BatchVars struct {
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Transfers []string `json:"transfers,omitempty"`
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Operation string `json:"operation"`
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Objects []*RequestVars `json:"objects"`
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}
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// BatchResponse contains multiple object metadata Representation structures
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// for use with the batch API.
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type BatchResponse struct {
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Transfer string `json:"transfer,omitempty"`
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Objects []*Representation `json:"objects"`
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}
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// Representation is object metadata as seen by clients of the lfs server.
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type Representation struct {
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Oid string `json:"oid"`
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Size int64 `json:"size"`
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Actions map[string]*link `json:"actions"`
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Error *ObjectError `json:"error,omitempty"`
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}
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// ObjectError defines the JSON structure returned to the client in case of an error
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type ObjectError struct {
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Code int `json:"code"`
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Message string `json:"message"`
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}
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// Claims is a JWT Token Claims
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type Claims struct {
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RepoID int64
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Op string
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UserID int64
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jwt.StandardClaims
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}
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// ObjectLink builds a URL linking to the object.
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func (v *RequestVars) ObjectLink() string {
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return setting.AppURL + path.Join(v.User, v.Repo+".git", "info/lfs/objects", v.Oid)
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}
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// VerifyLink builds a URL for verifying the object.
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func (v *RequestVars) VerifyLink() string {
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return setting.AppURL + path.Join(v.User, v.Repo+".git", "info/lfs/verify")
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}
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// link provides a structure used to build a hypermedia representation of an HTTP link.
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type link struct {
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Href string `json:"href"`
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Header map[string]string `json:"header,omitempty"`
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ExpiresAt time.Time `json:"expires_at,omitempty"`
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}
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var oidRegExp = regexp.MustCompile(`^[A-Fa-f0-9]+$`)
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func isOidValid(oid string) bool {
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return oidRegExp.MatchString(oid)
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}
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// ObjectOidHandler is the main request routing entry point into LFS server functions
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func ObjectOidHandler(ctx *context.Context) {
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if !setting.LFS.StartServer {
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log.Debug("Attempt to access LFS server but LFS server is disabled")
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writeStatus(ctx, 404)
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return
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}
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if ctx.Req.Method == "GET" || ctx.Req.Method == "HEAD" {
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if MetaMatcher(ctx.Req) {
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getMetaHandler(ctx)
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return
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}
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getContentHandler(ctx)
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return
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} else if ctx.Req.Method == "PUT" {
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PutHandler(ctx)
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return
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}
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log.Warn("Unhandled LFS method: %s for %s/%s OID[%s]", ctx.Req.Method, ctx.Params("username"), ctx.Params("reponame"), ctx.Params("oid"))
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writeStatus(ctx, 404)
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}
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func getAuthenticatedRepoAndMeta(ctx *context.Context, rv *RequestVars, requireWrite bool) (*models.LFSMetaObject, *models.Repository) {
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if !isOidValid(rv.Oid) {
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log.Info("Attempt to access invalid LFS OID[%s] in %s/%s", rv.Oid, rv.User, rv.Repo)
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writeStatus(ctx, 404)
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return nil, nil
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}
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repository, err := models.GetRepositoryByOwnerAndName(rv.User, rv.Repo)
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if err != nil {
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log.Error("Unable to get repository: %s/%s Error: %v", rv.User, rv.Repo, err)
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writeStatus(ctx, 404)
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return nil, nil
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}
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if !authenticate(ctx, repository, rv.Authorization, requireWrite) {
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requireAuth(ctx)
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return nil, nil
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}
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meta, err := repository.GetLFSMetaObjectByOid(rv.Oid)
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if err != nil {
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log.Error("Unable to get LFS OID[%s] Error: %v", rv.Oid, err)
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writeStatus(ctx, 404)
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return nil, nil
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}
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return meta, repository
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}
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// getContentHandler gets the content from the content store
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func getContentHandler(ctx *context.Context) {
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rv := unpack(ctx)
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meta, _ := getAuthenticatedRepoAndMeta(ctx, rv, false)
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if meta == nil {
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// Status already written in getAuthenticatedRepoAndMeta
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return
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}
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// Support resume download using Range header
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var fromByte, toByte int64
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toByte = meta.Size - 1
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statusCode := 200
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if rangeHdr := ctx.Req.Header.Get("Range"); rangeHdr != "" {
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regex := regexp.MustCompile(`bytes=(\d+)\-(\d*).*`)
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match := regex.FindStringSubmatch(rangeHdr)
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if len(match) > 1 {
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statusCode = 206
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fromByte, _ = strconv.ParseInt(match[1], 10, 32)
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if match[2] != "" {
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_toByte, _ := strconv.ParseInt(match[2], 10, 32)
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if _toByte >= fromByte && _toByte < toByte {
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toByte = _toByte
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}
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}
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ctx.Resp.Header().Set("Content-Range", fmt.Sprintf("bytes %d-%d/%d", fromByte, toByte, meta.Size-fromByte))
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ctx.Resp.Header().Set("Access-Control-Expose-Headers", "Content-Range")
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}
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}
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contentStore := &ContentStore{ObjectStorage: storage.LFS}
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content, err := contentStore.Get(meta, fromByte)
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if err != nil {
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// Errors are logged in contentStore.Get
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writeStatus(ctx, 404)
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return
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}
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defer content.Close()
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contentLength := toByte + 1 - fromByte
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ctx.Resp.Header().Set("Content-Length", strconv.FormatInt(contentLength, 10))
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ctx.Resp.Header().Set("Content-Type", "application/octet-stream")
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filename := ctx.Params("filename")
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if len(filename) > 0 {
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decodedFilename, err := base64.RawURLEncoding.DecodeString(filename)
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if err == nil {
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ctx.Resp.Header().Set("Content-Disposition", "attachment; filename=\""+string(decodedFilename)+"\"")
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ctx.Resp.Header().Set("Access-Control-Expose-Headers", "Content-Disposition")
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}
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}
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ctx.Resp.WriteHeader(statusCode)
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if written, err := io.CopyN(ctx.Resp, content, contentLength); err != nil {
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log.Error("Error whilst copying LFS OID[%s] to the response after %d bytes. Error: %v", meta.Oid, written, err)
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}
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logRequest(ctx.Req, statusCode)
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}
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// getMetaHandler retrieves metadata about the object
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func getMetaHandler(ctx *context.Context) {
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rv := unpack(ctx)
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meta, _ := getAuthenticatedRepoAndMeta(ctx, rv, false)
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if meta == nil {
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// Status already written in getAuthenticatedRepoAndMeta
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return
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}
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ctx.Resp.Header().Set("Content-Type", metaMediaType)
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if ctx.Req.Method == "GET" {
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enc := json.NewEncoder(ctx.Resp)
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if err := enc.Encode(Represent(rv, meta, true, false)); err != nil {
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log.Error("Failed to encode representation as json. Error: %v", err)
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}
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}
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logRequest(ctx.Req, 200)
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}
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// PostHandler instructs the client how to upload data
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func PostHandler(ctx *context.Context) {
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if !setting.LFS.StartServer {
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log.Debug("Attempt to access LFS server but LFS server is disabled")
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writeStatus(ctx, 404)
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return
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}
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if !MetaMatcher(ctx.Req) {
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log.Info("Attempt to POST without accepting the correct media type: %s", metaMediaType)
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writeStatus(ctx, 400)
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return
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}
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rv := unpack(ctx)
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repository, err := models.GetRepositoryByOwnerAndName(rv.User, rv.Repo)
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if err != nil {
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log.Error("Unable to get repository: %s/%s Error: %v", rv.User, rv.Repo, err)
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writeStatus(ctx, 404)
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return
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}
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if !authenticate(ctx, repository, rv.Authorization, true) {
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requireAuth(ctx)
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return
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}
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if !isOidValid(rv.Oid) {
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log.Info("Invalid LFS OID[%s] attempt to POST in %s/%s", rv.Oid, rv.User, rv.Repo)
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writeStatus(ctx, 404)
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return
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}
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if setting.LFS.MaxFileSize > 0 && rv.Size > setting.LFS.MaxFileSize {
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log.Info("Denied LFS OID[%s] upload of size %d to %s/%s because of LFS_MAX_FILE_SIZE=%d", rv.Oid, rv.Size, rv.User, rv.Repo, setting.LFS.MaxFileSize)
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writeStatus(ctx, 413)
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return
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}
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meta, err := models.NewLFSMetaObject(&models.LFSMetaObject{Oid: rv.Oid, Size: rv.Size, RepositoryID: repository.ID})
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if err != nil {
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log.Error("Unable to write LFS OID[%s] size %d meta object in %v/%v to database. Error: %v", rv.Oid, rv.Size, rv.User, rv.Repo, err)
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writeStatus(ctx, 404)
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return
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}
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ctx.Resp.Header().Set("Content-Type", metaMediaType)
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sentStatus := 202
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contentStore := &ContentStore{ObjectStorage: storage.LFS}
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exist, err := contentStore.Exists(meta)
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if err != nil {
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log.Error("Unable to check if LFS OID[%s] exist on %s / %s. Error: %v", rv.Oid, rv.User, rv.Repo, err)
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writeStatus(ctx, 500)
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return
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}
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if meta.Existing && exist {
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sentStatus = 200
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}
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ctx.Resp.WriteHeader(sentStatus)
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enc := json.NewEncoder(ctx.Resp)
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if err := enc.Encode(Represent(rv, meta, meta.Existing, true)); err != nil {
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log.Error("Failed to encode representation as json. Error: %v", err)
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}
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logRequest(ctx.Req, sentStatus)
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}
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// BatchHandler provides the batch api
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func BatchHandler(ctx *context.Context) {
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if !setting.LFS.StartServer {
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log.Debug("Attempt to access LFS server but LFS server is disabled")
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writeStatus(ctx, 404)
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return
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}
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if !MetaMatcher(ctx.Req) {
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log.Info("Attempt to BATCH without accepting the correct media type: %s", metaMediaType)
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writeStatus(ctx, 400)
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return
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}
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bv := unpackbatch(ctx)
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var responseObjects []*Representation
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// Create a response object
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for _, object := range bv.Objects {
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if !isOidValid(object.Oid) {
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log.Info("Invalid LFS OID[%s] attempt to BATCH in %s/%s", object.Oid, object.User, object.Repo)
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continue
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}
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repository, err := models.GetRepositoryByOwnerAndName(object.User, object.Repo)
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if err != nil {
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log.Error("Unable to get repository: %s/%s Error: %v", object.User, object.Repo, err)
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writeStatus(ctx, 404)
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return
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}
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requireWrite := false
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if bv.Operation == "upload" {
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requireWrite = true
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}
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if !authenticate(ctx, repository, object.Authorization, requireWrite) {
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requireAuth(ctx)
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return
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}
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contentStore := &ContentStore{ObjectStorage: storage.LFS}
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meta, err := repository.GetLFSMetaObjectByOid(object.Oid)
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if err == nil { // Object is found and exists
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exist, err := contentStore.Exists(meta)
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if err != nil {
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log.Error("Unable to check if LFS OID[%s] exist on %s / %s. Error: %v", object.Oid, object.User, object.Repo, err)
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writeStatus(ctx, 500)
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return
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}
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if exist {
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responseObjects = append(responseObjects, Represent(object, meta, true, false))
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continue
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}
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}
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if requireWrite && setting.LFS.MaxFileSize > 0 && object.Size > setting.LFS.MaxFileSize {
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log.Info("Denied LFS OID[%s] upload of size %d to %s/%s because of LFS_MAX_FILE_SIZE=%d", object.Oid, object.Size, object.User, object.Repo, setting.LFS.MaxFileSize)
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writeStatus(ctx, 413)
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return
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}
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// Object is not found
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meta, err = models.NewLFSMetaObject(&models.LFSMetaObject{Oid: object.Oid, Size: object.Size, RepositoryID: repository.ID})
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if err == nil {
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exist, err := contentStore.Exists(meta)
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if err != nil {
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log.Error("Unable to check if LFS OID[%s] exist on %s / %s. Error: %v", object.Oid, object.User, object.Repo, err)
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writeStatus(ctx, 500)
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return
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}
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responseObjects = append(responseObjects, Represent(object, meta, meta.Existing, !exist))
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} else {
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log.Error("Unable to write LFS OID[%s] size %d meta object in %v/%v to database. Error: %v", object.Oid, object.Size, object.User, object.Repo, err)
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}
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}
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ctx.Resp.Header().Set("Content-Type", metaMediaType)
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respobj := &BatchResponse{Objects: responseObjects}
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enc := json.NewEncoder(ctx.Resp)
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if err := enc.Encode(respobj); err != nil {
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log.Error("Failed to encode representation as json. Error: %v", err)
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}
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logRequest(ctx.Req, 200)
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}
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// PutHandler receives data from the client and puts it into the content store
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func PutHandler(ctx *context.Context) {
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rv := unpack(ctx)
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meta, repository := getAuthenticatedRepoAndMeta(ctx, rv, true)
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if meta == nil {
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// Status already written in getAuthenticatedRepoAndMeta
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return
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}
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contentStore := &ContentStore{ObjectStorage: storage.LFS}
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bodyReader := ctx.Req.Body().ReadCloser()
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defer bodyReader.Close()
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if err := contentStore.Put(meta, bodyReader); err != nil {
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// Put will log the error itself
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ctx.Resp.WriteHeader(500)
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if err == errSizeMismatch || err == errHashMismatch {
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fmt.Fprintf(ctx.Resp, `{"message":"%s"}`, err)
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} else {
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fmt.Fprintf(ctx.Resp, `{"message":"Internal Server Error"}`)
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}
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if _, err = repository.RemoveLFSMetaObjectByOid(rv.Oid); err != nil {
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log.Error("Whilst removing metaobject for LFS OID[%s] due to preceding error there was another Error: %v", rv.Oid, err)
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}
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return
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}
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logRequest(ctx.Req, 200)
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}
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// VerifyHandler verify oid and its size from the content store
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func VerifyHandler(ctx *context.Context) {
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if !setting.LFS.StartServer {
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log.Debug("Attempt to access LFS server but LFS server is disabled")
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writeStatus(ctx, 404)
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return
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}
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if !MetaMatcher(ctx.Req) {
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log.Info("Attempt to VERIFY without accepting the correct media type: %s", metaMediaType)
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writeStatus(ctx, 400)
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return
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}
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rv := unpack(ctx)
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meta, _ := getAuthenticatedRepoAndMeta(ctx, rv, true)
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if meta == nil {
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// Status already written in getAuthenticatedRepoAndMeta
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return
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}
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contentStore := &ContentStore{ObjectStorage: storage.LFS}
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ok, err := contentStore.Verify(meta)
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if err != nil {
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// Error will be logged in Verify
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ctx.Resp.WriteHeader(500)
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fmt.Fprintf(ctx.Resp, `{"message":"Internal Server Error"}`)
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return
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}
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if !ok {
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writeStatus(ctx, 422)
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return
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}
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logRequest(ctx.Req, 200)
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}
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// Represent takes a RequestVars and Meta and turns it into a Representation suitable
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// for json encoding
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func Represent(rv *RequestVars, meta *models.LFSMetaObject, download, upload bool) *Representation {
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rep := &Representation{
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Oid: meta.Oid,
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Size: meta.Size,
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Actions: make(map[string]*link),
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}
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header := make(map[string]string)
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if rv.Authorization == "" {
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//https://github.com/github/git-lfs/issues/1088
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header["Authorization"] = "Authorization: Basic dummy"
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} else {
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header["Authorization"] = rv.Authorization
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}
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if download {
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rep.Actions["download"] = &link{Href: rv.ObjectLink(), Header: header}
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}
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if upload {
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rep.Actions["upload"] = &link{Href: rv.ObjectLink(), Header: header}
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}
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if upload && !download {
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// Force client side verify action while gitea lacks proper server side verification
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verifyHeader := make(map[string]string)
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for k, v := range header {
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verifyHeader[k] = v
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}
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// This is only needed to workaround https://github.com/git-lfs/git-lfs/issues/3662
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verifyHeader["Accept"] = metaMediaType
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rep.Actions["verify"] = &link{Href: rv.VerifyLink(), Header: verifyHeader}
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}
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return rep
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}
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|
// MetaMatcher provides a mux.MatcherFunc that only allows requests that contain
|
|
// an Accept header with the metaMediaType
|
|
func MetaMatcher(r macaron.Request) bool {
|
|
mediaParts := strings.Split(r.Header.Get("Accept"), ";")
|
|
mt := mediaParts[0]
|
|
return mt == metaMediaType
|
|
}
|
|
|
|
func unpack(ctx *context.Context) *RequestVars {
|
|
r := ctx.Req
|
|
rv := &RequestVars{
|
|
User: ctx.Params("username"),
|
|
Repo: strings.TrimSuffix(ctx.Params("reponame"), ".git"),
|
|
Oid: ctx.Params("oid"),
|
|
Authorization: r.Header.Get("Authorization"),
|
|
}
|
|
|
|
if r.Method == "POST" { // Maybe also check if +json
|
|
var p RequestVars
|
|
bodyReader := r.Body().ReadCloser()
|
|
defer bodyReader.Close()
|
|
dec := json.NewDecoder(bodyReader)
|
|
err := dec.Decode(&p)
|
|
if err != nil {
|
|
// The error is logged as a WARN here because this may represent misbehaviour rather than a true error
|
|
log.Warn("Unable to decode POST request vars for LFS OID[%s] in %s/%s: Error: %v", rv.Oid, rv.User, rv.Repo, err)
|
|
return rv
|
|
}
|
|
|
|
rv.Oid = p.Oid
|
|
rv.Size = p.Size
|
|
}
|
|
|
|
return rv
|
|
}
|
|
|
|
// TODO cheap hack, unify with unpack
|
|
func unpackbatch(ctx *context.Context) *BatchVars {
|
|
|
|
r := ctx.Req
|
|
var bv BatchVars
|
|
|
|
bodyReader := r.Body().ReadCloser()
|
|
defer bodyReader.Close()
|
|
dec := json.NewDecoder(bodyReader)
|
|
err := dec.Decode(&bv)
|
|
if err != nil {
|
|
// The error is logged as a WARN here because this may represent misbehaviour rather than a true error
|
|
log.Warn("Unable to decode BATCH request vars in %s/%s: Error: %v", ctx.Params("username"), strings.TrimSuffix(ctx.Params("reponame"), ".git"), err)
|
|
return &bv
|
|
}
|
|
|
|
for i := 0; i < len(bv.Objects); i++ {
|
|
bv.Objects[i].User = ctx.Params("username")
|
|
bv.Objects[i].Repo = strings.TrimSuffix(ctx.Params("reponame"), ".git")
|
|
bv.Objects[i].Authorization = r.Header.Get("Authorization")
|
|
}
|
|
|
|
return &bv
|
|
}
|
|
|
|
func writeStatus(ctx *context.Context, status int) {
|
|
message := http.StatusText(status)
|
|
|
|
mediaParts := strings.Split(ctx.Req.Header.Get("Accept"), ";")
|
|
mt := mediaParts[0]
|
|
if strings.HasSuffix(mt, "+json") {
|
|
message = `{"message":"` + message + `"}`
|
|
}
|
|
|
|
ctx.Resp.WriteHeader(status)
|
|
fmt.Fprint(ctx.Resp, message)
|
|
logRequest(ctx.Req, status)
|
|
}
|
|
|
|
func logRequest(r macaron.Request, status int) {
|
|
log.Debug("LFS request - Method: %s, URL: %s, Status %d", r.Method, r.URL, status)
|
|
}
|
|
|
|
// authenticate uses the authorization string to determine whether
|
|
// or not to proceed. This server assumes an HTTP Basic auth format.
|
|
func authenticate(ctx *context.Context, repository *models.Repository, authorization string, requireWrite bool) bool {
|
|
accessMode := models.AccessModeRead
|
|
if requireWrite {
|
|
accessMode = models.AccessModeWrite
|
|
}
|
|
|
|
// ctx.IsSigned is unnecessary here, this will be checked in perm.CanAccess
|
|
perm, err := models.GetUserRepoPermission(repository, ctx.User)
|
|
if err != nil {
|
|
log.Error("Unable to GetUserRepoPermission for user %-v in repo %-v Error: %v", ctx.User, repository)
|
|
return false
|
|
}
|
|
|
|
canRead := perm.CanAccess(accessMode, models.UnitTypeCode)
|
|
if canRead {
|
|
return true
|
|
}
|
|
|
|
user, repo, opStr, err := parseToken(authorization)
|
|
if err != nil {
|
|
// Most of these are Warn level - the true internal server errors are logged in parseToken already
|
|
log.Warn("Authentication failure for provided token with Error: %v", err)
|
|
return false
|
|
}
|
|
ctx.User = user
|
|
if opStr == "basic" {
|
|
perm, err = models.GetUserRepoPermission(repository, ctx.User)
|
|
if err != nil {
|
|
log.Error("Unable to GetUserRepoPermission for user %-v in repo %-v Error: %v", ctx.User, repository)
|
|
return false
|
|
}
|
|
return perm.CanAccess(accessMode, models.UnitTypeCode)
|
|
}
|
|
if repository.ID == repo.ID {
|
|
if requireWrite && opStr != "upload" {
|
|
return false
|
|
}
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func parseToken(authorization string) (*models.User, *models.Repository, string, error) {
|
|
if authorization == "" {
|
|
return nil, nil, "unknown", fmt.Errorf("No token")
|
|
}
|
|
if strings.HasPrefix(authorization, "Bearer ") {
|
|
token, err := jwt.ParseWithClaims(authorization[7:], &Claims{}, func(t *jwt.Token) (interface{}, error) {
|
|
if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
|
|
return nil, fmt.Errorf("unexpected signing method: %v", t.Header["alg"])
|
|
}
|
|
return setting.LFS.JWTSecretBytes, nil
|
|
})
|
|
if err != nil {
|
|
// The error here is WARN level because it is caused by bad authorization rather than an internal server error
|
|
return nil, nil, "unknown", err
|
|
}
|
|
claims, claimsOk := token.Claims.(*Claims)
|
|
if !token.Valid || !claimsOk {
|
|
return nil, nil, "unknown", fmt.Errorf("Token claim invalid")
|
|
}
|
|
r, err := models.GetRepositoryByID(claims.RepoID)
|
|
if err != nil {
|
|
log.Error("Unable to GetRepositoryById[%d]: Error: %v", claims.RepoID, err)
|
|
return nil, nil, claims.Op, err
|
|
}
|
|
u, err := models.GetUserByID(claims.UserID)
|
|
if err != nil {
|
|
log.Error("Unable to GetUserById[%d]: Error: %v", claims.UserID, err)
|
|
return nil, r, claims.Op, err
|
|
}
|
|
return u, r, claims.Op, nil
|
|
}
|
|
|
|
if strings.HasPrefix(authorization, "Basic ") {
|
|
c, err := base64.StdEncoding.DecodeString(strings.TrimPrefix(authorization, "Basic "))
|
|
if err != nil {
|
|
return nil, nil, "basic", err
|
|
}
|
|
cs := string(c)
|
|
i := strings.IndexByte(cs, ':')
|
|
if i < 0 {
|
|
return nil, nil, "basic", fmt.Errorf("Basic auth invalid")
|
|
}
|
|
user, password := cs[:i], cs[i+1:]
|
|
u, err := models.GetUserByName(user)
|
|
if err != nil {
|
|
log.Error("Unable to GetUserByName[%d]: Error: %v", user, err)
|
|
return nil, nil, "basic", err
|
|
}
|
|
if !u.IsPasswordSet() || !u.ValidatePassword(password) {
|
|
return nil, nil, "basic", fmt.Errorf("Basic auth failed")
|
|
}
|
|
return u, nil, "basic", nil
|
|
}
|
|
|
|
return nil, nil, "unknown", fmt.Errorf("Token not found")
|
|
}
|
|
|
|
func requireAuth(ctx *context.Context) {
|
|
ctx.Resp.Header().Set("WWW-Authenticate", "Basic realm=gitea-lfs")
|
|
writeStatus(ctx, 401)
|
|
}
|