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Prevent double-login for Git HTTP and LFS and simplify login (#15303)

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* Prevent double-login for Git HTTP and LFS and simplify login

There are a number of inconsistencies with our current methods for
logging in for git and lfs. The first is that there is a double login
process. This is particularly evident in 1.13 where there are no less
than 4 hash checks for basic authentication due to the previous
IsPasswordSet behaviour.

This duplicated code had individual inconsistencies that were not
helpful and caused confusion.

This PR does the following:

* Remove the specific login code from the git and lfs handlers except
for the lfs special bearer token
* Simplify the meaning of DisableBasicAuthentication to allow Token and
Oauth2 sign-in.
* The removal of the specific code from git and lfs means that these
both now have the same login semantics and can - if not
DisableBasicAuthentication - login from external services. Further it
allows Oauth2 token authentication as per our standard mechanisms.
* The change in the recovery handler prevents the service from
re-attempting to login - primarily because this could easily cause a
further panic and it is wasteful.

* add test

Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: Andrew Thornton <art27@cantab.net>
This commit is contained in:
zeripath 2021-05-15 16:32:09 +01:00 committed by GitHub
parent ba526ceffe
commit 17c5c654a5
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
10 changed files with 292 additions and 221 deletions
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2
integrations/api_repo_lfs_locks_test.go
View file

@ -44,7 +44,7 @@ func TestAPILFSLocksNotLogin(t *testing.T) {
resp := MakeRequest(t, req, http.StatusUnauthorized)
var lfsLockError api.LFSLockError
DecodeJSON(t, resp, &lfsLockError)
assert.Equal(t, "Unauthorized", lfsLockError.Message)
assert.Equal(t, "You must have pull access to list locks", lfsLockError.Message)
}
func TestAPILFSLocksLogged(t *testing.T) {

45
modules/auth/sso/basic.go
View file

@ -14,6 +14,7 @@ import (
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/timeutil"
"code.gitea.io/gitea/modules/web/middleware"
)
// Ensure the struct implements the interface.
@ -40,7 +41,7 @@ func (b *Basic) Free() error {
// IsEnabled returns true as this plugin is enabled by default and its not possible to disable
// it from settings.
func (b *Basic) IsEnabled() bool {
return setting.Service.EnableBasicAuth
return true
}
// VerifyAuthData extracts and validates Basic data (username and password/token) from the
@ -48,17 +49,22 @@ func (b *Basic) IsEnabled() bool {
// name/token on successful validation.
// Returns nil if header is empty or validation fails.
func (b *Basic) VerifyAuthData(req *http.Request, w http.ResponseWriter, store DataStore, sess SessionStore) *models.User {
// Basic authentication should only fire on API, Download or on Git or LFSPaths
if middleware.IsInternalPath(req) || !middleware.IsAPIPath(req) && !isAttachmentDownload(req) && !isGitOrLFSPath(req) {
return nil
}
baHead := req.Header.Get("Authorization")
if len(baHead) == 0 {
return nil
}
auths := strings.Fields(baHead)
auths := strings.SplitN(baHead, " ", 2)
if len(auths) != 2 || (auths[0] != "Basic" && auths[0] != "basic") {
return nil
}
var u *models.User
uname, passwd, _ := base.BasicAuthDecode(auths[1])
// Check if username or password is a token
@ -76,20 +82,21 @@ func (b *Basic) VerifyAuthData(req *http.Request, w http.ResponseWriter, store D
uid := CheckOAuthAccessToken(authToken)
if uid != 0 {
log.Trace("Basic Authorization: Valid OAuthAccessToken for user[%d]", uid)
var err error
store.GetData()["IsApiToken"] = true
u, err = models.GetUserByID(uid)
u, err := models.GetUserByID(uid)
if err != nil {
log.Error("GetUserByID: %v", err)
return nil
}
store.GetData()["IsApiToken"] = true
return u
}
token, err := models.GetAccessTokenBySHA(authToken)
if err == nil {
log.Trace("Basic Authorization: Valid AccessToken for user[%d]", uid)
u, err = models.GetUserByID(token.UID)
u, err := models.GetUserByID(token.UID)
if err != nil {
log.Error("GetUserByID: %v", err)
return nil
@ -99,22 +106,24 @@ func (b *Basic) VerifyAuthData(req *http.Request, w http.ResponseWriter, store D
if err = models.UpdateAccessToken(token); err != nil {
log.Error("UpdateAccessToken: %v", err)
}
store.GetData()["IsApiToken"] = true
return u
} else if !models.IsErrAccessTokenNotExist(err) && !models.IsErrAccessTokenEmpty(err) {
log.Error("GetAccessTokenBySha: %v", err)
}
if u == nil {
log.Trace("Basic Authorization: Attempting SignIn for %s", uname)
if !setting.Service.EnableBasicAuth {
return nil
}
u, err = models.UserSignIn(uname, passwd)
if err != nil {
if !models.IsErrUserNotExist(err) {
log.Error("UserSignIn: %v", err)
}
return nil
log.Trace("Basic Authorization: Attempting SignIn for %s", uname)
u, err := models.UserSignIn(uname, passwd)
if err != nil {
if !models.IsErrUserNotExist(err) {
log.Error("UserSignIn: %v", err)
}
} else {
store.GetData()["IsApiToken"] = true
return nil
}
log.Trace("Basic Authorization: Logged in user %-v", u)

17
modules/auth/sso/sso.go
View file

@ -9,10 +9,12 @@ import (
"fmt"
"net/http"
"reflect"
"regexp"
"strings"
"code.gitea.io/gitea/models"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/web/middleware"
)
@ -27,9 +29,9 @@ import (
// for users that have already signed in.
var ssoMethods = []SingleSignOn{
&OAuth2{},
&Basic{},
&Session{},
&ReverseProxy{},
&Basic{},
}
// The purpose of the following three function variables is to let the linter know that
@ -102,6 +104,19 @@ func isAttachmentDownload(req *http.Request) bool {
return strings.HasPrefix(req.URL.Path, "/attachments/") && req.Method == "GET"
}
var gitPathRe = regexp.MustCompile(`^/[a-zA-Z0-9_.-]+/[a-zA-Z0-9_.-]+/(?:(?:git-(?:(?:upload)|(?:receive))-pack$)|(?:info/refs$)|(?:HEAD$)|(?:objects/))`)
var lfsPathRe = regexp.MustCompile(`^/[a-zA-Z0-9_.-]+/[a-zA-Z0-9_.-]+/info/lfs/`)
func isGitOrLFSPath(req *http.Request) bool {
if gitPathRe.MatchString(req.URL.Path) {
return true
}
if setting.LFS.StartServer {
return lfsPathRe.MatchString(req.URL.Path)
}
return false
}
// handleSignIn clears existing session variables and stores new ones for the specified user object
func handleSignIn(resp http.ResponseWriter, req *http.Request, sess SessionStore, user *models.User) {
_ = sess.Delete("openid_verified_uri")

124
modules/auth/sso/sso_test.go Normal file
View file

@ -0,0 +1,124 @@
// Copyright 2014 The Gogs Authors. All rights reserved.
// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package sso
import (
"net/http"
"testing"
"code.gitea.io/gitea/modules/setting"
)
func Test_isGitOrLFSPath(t *testing.T) {
tests := []struct {
path string
want bool
}{
{
"/owner/repo/git-upload-pack",
true,
},
{
"/owner/repo/git-receive-pack",
true,
},
{
"/owner/repo/info/refs",
true,
},
{
"/owner/repo/HEAD",
true,
},
{
"/owner/repo/objects/info/alternates",
true,
},
{
"/owner/repo/objects/info/http-alternates",
true,
},
{
"/owner/repo/objects/info/packs",
true,
},
{
"/owner/repo/objects/info/blahahsdhsdkla",
true,
},
{
"/owner/repo/objects/01/23456789abcdef0123456789abcdef01234567",
true,
},
{
"/owner/repo/objects/pack/pack-123456789012345678921234567893124567894.pack",
true,
},
{
"/owner/repo/objects/pack/pack-0123456789abcdef0123456789abcdef0123456.idx",
true,
},
{
"/owner/repo/stars",
false,
},
{
"/notowner",
false,
},
{
"/owner/repo",
false,
},
{
"/owner/repo/commit/123456789012345678921234567893124567894",
false,
},
}
lfsTests := []string{
"/owner/repo/info/lfs/",
"/owner/repo/info/lfs/objects/batch",
"/owner/repo/info/lfs/objects/oid/filename",
"/owner/repo/info/lfs/objects/oid",
"/owner/repo/info/lfs/objects",
"/owner/repo/info/lfs/verify",
"/owner/repo/info/lfs/locks",
"/owner/repo/info/lfs/locks/verify",
"/owner/repo/info/lfs/locks/123/unlock",
}
origLFSStartServer := setting.LFS.StartServer
for _, tt := range tests {
t.Run(tt.path, func(t *testing.T) {
req, _ := http.NewRequest("POST", "http://localhost"+tt.path, nil)
setting.LFS.StartServer = false
if got := isGitOrLFSPath(req); got != tt.want {
t.Errorf("isGitOrLFSPath() = %v, want %v", got, tt.want)
}
setting.LFS.StartServer = true
if got := isGitOrLFSPath(req); got != tt.want {
t.Errorf("isGitOrLFSPath() = %v, want %v", got, tt.want)
}
})
}
for _, tt := range lfsTests {
t.Run(tt, func(t *testing.T) {
req, _ := http.NewRequest("POST", tt, nil)
setting.LFS.StartServer = false
if got := isGitOrLFSPath(req); got != setting.LFS.StartServer {
t.Errorf("isGitOrLFSPath(%q) = %v, want %v, %v", tt, got, setting.LFS.StartServer, gitPathRe.MatchString(tt))
}
setting.LFS.StartServer = true
if got := isGitOrLFSPath(req); got != setting.LFS.StartServer {
t.Errorf("isGitOrLFSPath(%q) = %v, want %v", tt, got, setting.LFS.StartServer)
}
})
}
setting.LFS.StartServer = origLFSStartServer
}

3
modules/context/context.go
View file

@ -683,6 +683,9 @@ func Contexter() func(next http.Handler) http.Handler {
} else {
ctx.Data["SignedUserID"] = int64(0)
ctx.Data["SignedUserName"] = ""
// ensure the session uid is deleted
_ = ctx.Session.Delete("uid")
}
ctx.Resp.Header().Set(`X-Frame-Options`, `SAMEORIGIN`)

2
routers/private/internal.go
View file

@ -23,7 +23,7 @@ import (
func CheckInternalToken(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
tokens := req.Header.Get("Authorization")
fields := strings.Fields(tokens)
fields := strings.SplitN(tokens, " ", 2)
if len(fields) != 2 || fields[0] != "Bearer" || fields[1] != setting.InternalToken {
log.Debug("Forbidden attempt to access internal url: Authorization header: %s", tokens)
http.Error(w, http.StatusText(http.StatusForbidden), http.StatusForbidden)

129
routers/repo/http.go
View file

@ -22,15 +22,12 @@ import (
"time"
"code.gitea.io/gitea/models"
"code.gitea.io/gitea/modules/auth/sso"
"code.gitea.io/gitea/modules/base"
"code.gitea.io/gitea/modules/context"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/process"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/structs"
"code.gitea.io/gitea/modules/timeutil"
"code.gitea.io/gitea/modules/util"
repo_service "code.gitea.io/gitea/services/repository"
)
@ -153,11 +150,8 @@ func httpBase(ctx *context.Context) (h *serviceHandler) {
// Only public pull don't need auth.
isPublicPull := repoExist && !repo.IsPrivate && isPull
var (
askAuth = !isPublicPull || setting.Service.RequireSignInView
authUser *models.User
authUsername string
authPasswd string
environ []string
askAuth = !isPublicPull || setting.Service.RequireSignInView
environ []string
)
// don't allow anonymous pulls if organization is not public
@ -172,108 +166,33 @@ func httpBase(ctx *context.Context) (h *serviceHandler) {
// check access
if askAuth {
authUsername = ctx.Req.Header.Get(setting.ReverseProxyAuthUser)
if setting.Service.EnableReverseProxyAuth && len(authUsername) > 0 {
authUser, err = models.GetUserByName(authUsername)
if err != nil {
ctx.HandleText(401, "reverse proxy login error, got error while running GetUserByName")
return
}
} else {
authHead := ctx.Req.Header.Get("Authorization")
if len(authHead) == 0 {
ctx.Resp.Header().Set("WWW-Authenticate", "Basic realm=\".\"")
ctx.Error(http.StatusUnauthorized)
return
}
// rely on the results of Contexter
if !ctx.IsSigned {
// TODO: support digit auth - which would be Authorization header with digit
ctx.Resp.Header().Set("WWW-Authenticate", "Basic realm=\".\"")
ctx.Error(http.StatusUnauthorized)
return
}
auths := strings.Fields(authHead)
// currently check basic auth
// TODO: support digit auth
// FIXME: middlewares/context.go did basic auth check already,
// maybe could use that one.
if len(auths) != 2 || auths[0] != "Basic" {
ctx.HandleText(http.StatusUnauthorized, "no basic auth and digit auth")
return
}
authUsername, authPasswd, err = base.BasicAuthDecode(auths[1])
if err != nil {
ctx.HandleText(http.StatusUnauthorized, "no basic auth and digit auth")
return
}
// Check if username or password is a token
isUsernameToken := len(authPasswd) == 0 || authPasswd == "x-oauth-basic"
// Assume username is token
authToken := authUsername
if !isUsernameToken {
// Assume password is token
authToken = authPasswd
}
uid := sso.CheckOAuthAccessToken(authToken)
if uid != 0 {
ctx.Data["IsApiToken"] = true
authUser, err = models.GetUserByID(uid)
if err != nil {
ctx.ServerError("GetUserByID", err)
return
}
}
// Assume password is a token.
token, err := models.GetAccessTokenBySHA(authToken)
if ctx.IsBasicAuth {
_, err = models.GetTwoFactorByUID(ctx.User.ID)
if err == nil {
authUser, err = models.GetUserByID(token.UID)
if err != nil {
ctx.ServerError("GetUserByID", err)
return
}
token.UpdatedUnix = timeutil.TimeStampNow()
if err = models.UpdateAccessToken(token); err != nil {
ctx.ServerError("UpdateAccessToken", err)
}
} else if !models.IsErrAccessTokenNotExist(err) && !models.IsErrAccessTokenEmpty(err) {
log.Error("GetAccessTokenBySha: %v", err)
}
if authUser == nil {
// Check username and password
authUser, err = models.UserSignIn(authUsername, authPasswd)
if err != nil {
if models.IsErrUserProhibitLogin(err) {
ctx.HandleText(http.StatusForbidden, "User is not permitted to login")
return
} else if !models.IsErrUserNotExist(err) {
ctx.ServerError("UserSignIn error: %v", err)
return
}
}
if authUser == nil {
ctx.HandleText(http.StatusUnauthorized, fmt.Sprintf("invalid credentials from %s", ctx.RemoteAddr()))
return
}
_, err = models.GetTwoFactorByUID(authUser.ID)
if err == nil {
// TODO: This response should be changed to "invalid credentials" for security reasons once the expectation behind it (creating an app token to authenticate) is properly documented
ctx.HandleText(http.StatusUnauthorized, "Users with two-factor authentication enabled cannot perform HTTP/HTTPS operations via plain username and password. Please create and use a personal access token on the user settings page")
return
} else if !models.IsErrTwoFactorNotEnrolled(err) {
ctx.ServerError("IsErrTwoFactorNotEnrolled", err)
return
}
// TODO: This response should be changed to "invalid credentials" for security reasons once the expectation behind it (creating an app token to authenticate) is properly documented
ctx.HandleText(http.StatusUnauthorized, "Users with two-factor authentication enabled cannot perform HTTP/HTTPS operations via plain username and password. Please create and use a personal access token on the user settings page")
return
} else if !models.IsErrTwoFactorNotEnrolled(err) {
ctx.ServerError("IsErrTwoFactorNotEnrolled", err)
return
}
}
if !authUser.IsActive || authUser.ProhibitLogin {
if !ctx.User.IsActive || ctx.User.ProhibitLogin {
ctx.HandleText(http.StatusForbidden, "Your account is disabled.")
return
}
if repoExist {
perm, err := models.GetUserRepoPermission(repo, authUser)
perm, err := models.GetUserRepoPermission(repo, ctx.User)
if err != nil {
ctx.ServerError("GetUserRepoPermission", err)
return
@ -293,14 +212,14 @@ func httpBase(ctx *context.Context) (h *serviceHandler) {
environ = []string{
models.EnvRepoUsername + "=" + username,
models.EnvRepoName + "=" + reponame,
models.EnvPusherName + "=" + authUser.Name,
models.EnvPusherID + fmt.Sprintf("=%d", authUser.ID),
models.EnvPusherName + "=" + ctx.User.Name,
models.EnvPusherID + fmt.Sprintf("=%d", ctx.User.ID),
models.EnvIsDeployKey + "=false",
models.EnvAppURL + "=" + setting.AppURL,
}
if !authUser.KeepEmailPrivate {
environ = append(environ, models.EnvPusherEmail+"="+authUser.Email)
if !ctx.User.KeepEmailPrivate {
environ = append(environ, models.EnvPusherEmail+"="+ctx.User.Email)
}
if isWiki {
@ -336,7 +255,7 @@ func httpBase(ctx *context.Context) (h *serviceHandler) {
return
}
repo, err = repo_service.PushCreateRepo(authUser, owner, reponame)
repo, err = repo_service.PushCreateRepo(ctx.User, owner, reponame)
if err != nil {
log.Error("pushCreateRepo: %v", err)
ctx.Status(http.StatusNotFound)

16
routers/routes/base.go
View file

@ -15,6 +15,7 @@ import (
"strings"
"time"
"code.gitea.io/gitea/models"
"code.gitea.io/gitea/modules/auth/sso"
"code.gitea.io/gitea/modules/context"
"code.gitea.io/gitea/modules/httpcache"
@ -171,8 +172,19 @@ func Recovery() func(next http.Handler) http.Handler {
},
}
// Get user from session if logged in.
user, _ := sso.SignedInUser(req, w, &store, sessionStore)
var user *models.User
if apiContext := context.GetAPIContext(req); apiContext != nil {
user = apiContext.User
}
if user == nil {
if ctx := context.GetContext(req); ctx != nil {
user = ctx.User
}
}
if user == nil {
// Get user from session if logged in - do not attempt to sign-in
user = sso.SessionUser(sessionStore)
}
if user != nil {
store.Data["IsSigned"] = true
store.Data["SignedUser"] = user

48
services/lfs/locks.go
View file

@ -31,15 +31,6 @@ func checkIsValidRequest(ctx *context.Context) bool {
writeStatus(ctx, http.StatusBadRequest)
return false
}
if !ctx.IsSigned {
user, _, _, err := parseToken(ctx.Req.Header.Get("Authorization"))
if err != nil {
ctx.Resp.Header().Set("WWW-Authenticate", "Basic realm=gitea-lfs")
writeStatus(ctx, http.StatusUnauthorized)
return false
}
ctx.User = user
}
return true
}
@ -73,19 +64,21 @@ func GetListLockHandler(ctx *context.Context) {
// Status is written in checkIsValidRequest
return
}
ctx.Resp.Header().Set("Content-Type", lfs_module.MediaType)
rv, _ := unpack(ctx)
repository, err := models.GetRepositoryByOwnerAndName(rv.User, rv.Repo)
if err != nil {
log.Debug("Could not find repository: %s/%s - %s", rv.User, rv.Repo, err)
writeStatus(ctx, 404)
ctx.Resp.Header().Set("WWW-Authenticate", "Basic realm=gitea-lfs")
ctx.JSON(401, api.LFSLockError{
Message: "You must have pull access to list locks",
})
return
}
repository.MustOwner()
authenticated := authenticate(ctx, repository, rv.Authorization, false)
authenticated := authenticate(ctx, repository, rv.Authorization, true, false)
if !authenticated {
ctx.Resp.Header().Set("WWW-Authenticate", "Basic realm=gitea-lfs")
ctx.JSON(http.StatusUnauthorized, api.LFSLockError{
@ -93,6 +86,7 @@ func GetListLockHandler(ctx *context.Context) {
})
return
}
ctx.Resp.Header().Set("Content-Type", lfs_module.MediaType)
cursor := ctx.QueryInt("cursor")
if cursor < 0 {
@ -160,7 +154,6 @@ func PostLockHandler(ctx *context.Context) {
// Status is written in checkIsValidRequest
return
}
ctx.Resp.Header().Set("Content-Type", lfs_module.MediaType)
userName := ctx.Params("username")
repoName := strings.TrimSuffix(ctx.Params("reponame"), ".git")
@ -169,12 +162,15 @@ func PostLockHandler(ctx *context.Context) {
repository, err := models.GetRepositoryByOwnerAndName(userName, repoName)
if err != nil {
log.Error("Unable to get repository: %s/%s Error: %v", userName, repoName, err)
writeStatus(ctx, 404)
ctx.Resp.Header().Set("WWW-Authenticate", "Basic realm=gitea-lfs")
ctx.JSON(401, api.LFSLockError{
Message: "You must have push access to create locks",
})
return
}
repository.MustOwner()
authenticated := authenticate(ctx, repository, authorization, true)
authenticated := authenticate(ctx, repository, authorization, true, true)
if !authenticated {
ctx.Resp.Header().Set("WWW-Authenticate", "Basic realm=gitea-lfs")
ctx.JSON(http.StatusUnauthorized, api.LFSLockError{
@ -183,6 +179,8 @@ func PostLockHandler(ctx *context.Context) {
return
}
ctx.Resp.Header().Set("Content-Type", lfs_module.MediaType)
var req api.LFSLockRequest
bodyReader := ctx.Req.Body
defer bodyReader.Close()
@ -229,7 +227,6 @@ func VerifyLockHandler(ctx *context.Context) {
// Status is written in checkIsValidRequest
return
}
ctx.Resp.Header().Set("Content-Type", lfs_module.MediaType)
userName := ctx.Params("username")
repoName := strings.TrimSuffix(ctx.Params("reponame"), ".git")
@ -238,12 +235,15 @@ func VerifyLockHandler(ctx *context.Context) {
repository, err := models.GetRepositoryByOwnerAndName(userName, repoName)
if err != nil {
log.Error("Unable to get repository: %s/%s Error: %v", userName, repoName, err)
writeStatus(ctx, 404)
ctx.Resp.Header().Set("WWW-Authenticate", "Basic realm=gitea-lfs")
ctx.JSON(401, api.LFSLockError{
Message: "You must have push access to verify locks",
})
return
}
repository.MustOwner()
authenticated := authenticate(ctx, repository, authorization, true)
authenticated := authenticate(ctx, repository, authorization, true, true)
if !authenticated {
ctx.Resp.Header().Set("WWW-Authenticate", "Basic realm=gitea-lfs")
ctx.JSON(http.StatusUnauthorized, api.LFSLockError{
@ -252,6 +252,8 @@ func VerifyLockHandler(ctx *context.Context) {
return
}
ctx.Resp.Header().Set("Content-Type", lfs_module.MediaType)
cursor := ctx.QueryInt("cursor")
if cursor < 0 {
cursor = 0
@ -296,7 +298,6 @@ func UnLockHandler(ctx *context.Context) {
// Status is written in checkIsValidRequest
return
}
ctx.Resp.Header().Set("Content-Type", lfs_module.MediaType)
userName := ctx.Params("username")
repoName := strings.TrimSuffix(ctx.Params("reponame"), ".git")
@ -305,12 +306,15 @@ func UnLockHandler(ctx *context.Context) {
repository, err := models.GetRepositoryByOwnerAndName(userName, repoName)
if err != nil {
log.Error("Unable to get repository: %s/%s Error: %v", userName, repoName, err)
writeStatus(ctx, 404)
ctx.Resp.Header().Set("WWW-Authenticate", "Basic realm=gitea-lfs")
ctx.JSON(401, api.LFSLockError{
Message: "You must have push access to delete locks",
})
return
}
repository.MustOwner()
authenticated := authenticate(ctx, repository, authorization, true)
authenticated := authenticate(ctx, repository, authorization, true, true)
if !authenticated {
ctx.Resp.Header().Set("WWW-Authenticate", "Basic realm=gitea-lfs")
ctx.JSON(http.StatusUnauthorized, api.LFSLockError{
@ -319,6 +323,8 @@ func UnLockHandler(ctx *context.Context) {
return
}
ctx.Resp.Header().Set("Content-Type", lfs_module.MediaType)
var req api.LFSLockDeleteRequest
bodyReader := ctx.Req.Body
defer bodyReader.Close()

127
services/lfs/server.go
View file

@ -94,7 +94,7 @@ func getAuthenticatedRepoAndMeta(ctx *context.Context, rc *requestContext, p lfs
return nil, nil
}
if !authenticate(ctx, repository, rc.Authorization, requireWrite) {
if !authenticate(ctx, repository, rc.Authorization, false, requireWrite) {
requireAuth(ctx)
return nil, nil
}
@ -232,7 +232,7 @@ func PostHandler(ctx *context.Context) {
return
}
if !authenticate(ctx, repository, rc.Authorization, true) {
if !authenticate(ctx, repository, rc.Authorization, false, true) {
requireAuth(ctx)
return
}
@ -322,7 +322,7 @@ func BatchHandler(ctx *context.Context) {
requireWrite = true
}
if !authenticate(ctx, repository, reqCtx.Authorization, requireWrite) {
if !authenticate(ctx, repository, reqCtx.Authorization, false, requireWrite) {
requireAuth(ctx)
return
}
@ -561,7 +561,7 @@ func logRequest(r *http.Request, status int) {
// 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 {
func authenticate(ctx *context.Context, repository *models.Repository, authorization string, requireSigned, requireWrite bool) bool {
accessMode := models.AccessModeRead
if requireWrite {
accessMode = models.AccessModeWrite
@ -575,89 +575,72 @@ func authenticate(ctx *context.Context, repository *models.Repository, authoriza
}
canRead := perm.CanAccess(accessMode, models.UnitTypeCode)
if canRead {
if canRead && (!requireSigned || ctx.IsSigned) {
return true
}
user, repo, opStr, err := parseToken(authorization)
user, err := parseToken(authorization, repository, accessMode)
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
return true
}
func parseToken(authorization string) (*models.User, *models.Repository, string, error) {
func handleLFSToken(tokenSHA string, target *models.Repository, mode models.AccessMode) (*models.User, error) {
if !strings.Contains(tokenSHA, ".") {
return nil, nil
}
token, err := jwt.ParseWithClaims(tokenSHA, &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 {
return nil, nil
}
claims, claimsOk := token.Claims.(*Claims)
if !token.Valid || !claimsOk {
return nil, fmt.Errorf("invalid token claim")
}
if claims.RepoID != target.ID {
return nil, fmt.Errorf("invalid token claim")
}
if mode == models.AccessModeWrite && claims.Op != "upload" {
return nil, fmt.Errorf("invalid token claim")
}
u, err := models.GetUserByID(claims.UserID)
if err != nil {
log.Error("Unable to GetUserById[%d]: Error: %v", claims.UserID, err)
return nil, err
}
return u, nil
}
func parseToken(authorization string, target *models.Repository, mode models.AccessMode) (*models.User, 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
return nil, fmt.Errorf("no token")
}
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
parts := strings.SplitN(authorization, " ", 2)
if len(parts) != 2 {
return nil, fmt.Errorf("no token")
}
return nil, nil, "unknown", fmt.Errorf("Token not found")
tokenSHA := parts[1]
switch strings.ToLower(parts[0]) {
case "bearer":
fallthrough
case "token":
return handleLFSToken(tokenSHA, target, mode)
}
return nil, fmt.Errorf("token not found")
}
func requireAuth(ctx *context.Context) {