forgejo-federation/cmd/serv.go

337 lines
8.9 KiB
Go

// Copyright 2014 The Gogs Authors. All rights reserved.
// Copyright 2016 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 cmd
import (
"encoding/json"
"fmt"
"os"
"os/exec"
"path/filepath"
"strings"
"time"
"code.gitea.io/gitea/models"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/private"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/util"
"github.com/Unknwon/com"
"github.com/dgrijalva/jwt-go"
"github.com/urfave/cli"
)
const (
accessDenied = "Repository does not exist or you do not have access"
lfsAuthenticateVerb = "git-lfs-authenticate"
)
// CmdServ represents the available serv sub-command.
var CmdServ = cli.Command{
Name: "serv",
Usage: "This command should only be called by SSH shell",
Description: `Serv provide access auth for repositories`,
Action: runServ,
Flags: []cli.Flag{
cli.StringFlag{
Name: "config, c",
Value: "custom/conf/app.ini",
Usage: "Custom configuration file path",
},
},
}
func setup(logPath string) error {
setting.NewContext()
log.NewGitLogger(filepath.Join(setting.LogRootPath, logPath))
models.LoadConfigs()
if setting.UseSQLite3 || setting.UseTiDB {
workPath := setting.AppWorkPath
if err := os.Chdir(workPath); err != nil {
log.GitLogger.Fatal(4, "Failed to change directory %s: %v", workPath, err)
}
}
setting.NewXORMLogService(true)
return models.SetEngine()
}
func parseCmd(cmd string) (string, string) {
ss := strings.SplitN(cmd, " ", 2)
if len(ss) != 2 {
return "", ""
}
return ss[0], strings.Replace(ss[1], "'/", "'", 1)
}
var (
allowedCommands = map[string]models.AccessMode{
"git-upload-pack": models.AccessModeRead,
"git-upload-archive": models.AccessModeRead,
"git-receive-pack": models.AccessModeWrite,
lfsAuthenticateVerb: models.AccessModeNone,
}
)
func fail(userMessage, logMessage string, args ...interface{}) {
fmt.Fprintln(os.Stderr, "Gitea:", userMessage)
if len(logMessage) > 0 {
if !setting.ProdMode {
fmt.Fprintf(os.Stderr, logMessage+"\n", args...)
}
log.GitLogger.Fatal(3, logMessage, args...)
return
}
log.GitLogger.Close()
os.Exit(1)
}
func runServ(c *cli.Context) error {
if c.IsSet("config") {
setting.CustomConf = c.String("config")
}
if err := setup("serv.log"); err != nil {
fail("System init failed", fmt.Sprintf("setup: %v", err))
}
if setting.SSH.Disabled {
println("Gitea: SSH has been disabled")
return nil
}
if len(c.Args()) < 1 {
cli.ShowSubcommandHelp(c)
return nil
}
cmd := os.Getenv("SSH_ORIGINAL_COMMAND")
if len(cmd) == 0 {
println("Hi there, You've successfully authenticated, but Gitea does not provide shell access.")
println("If this is unexpected, please log in with password and setup Gitea under another user.")
return nil
}
verb, args := parseCmd(cmd)
var lfsVerb string
if verb == lfsAuthenticateVerb {
if !setting.LFS.StartServer {
fail("Unknown git command", "LFS authentication request over SSH denied, LFS support is disabled")
}
argsSplit := strings.Split(args, " ")
if len(argsSplit) >= 2 {
args = strings.TrimSpace(argsSplit[0])
lfsVerb = strings.TrimSpace(argsSplit[1])
}
}
repoPath := strings.ToLower(strings.Trim(args, "'"))
rr := strings.SplitN(repoPath, "/", 2)
if len(rr) != 2 {
fail("Invalid repository path", "Invalid repository path: %v", args)
}
username := strings.ToLower(rr[0])
reponame := strings.ToLower(strings.TrimSuffix(rr[1], ".git"))
isWiki := false
unitType := models.UnitTypeCode
if strings.HasSuffix(reponame, ".wiki") {
isWiki = true
unitType = models.UnitTypeWiki
reponame = reponame[:len(reponame)-5]
}
os.Setenv(models.EnvRepoUsername, username)
if isWiki {
os.Setenv(models.EnvRepoIsWiki, "true")
} else {
os.Setenv(models.EnvRepoIsWiki, "false")
}
os.Setenv(models.EnvRepoName, reponame)
repo, err := models.GetRepositoryByOwnerAndName(username, reponame)
if err != nil {
if models.IsErrRepoNotExist(err) {
fail(accessDenied, "Repository does not exist: %s/%s", username, reponame)
}
fail("Internal error", "Failed to get repository: %v", err)
}
requestedMode, has := allowedCommands[verb]
if !has {
fail("Unknown git command", "Unknown git command %s", verb)
}
if verb == lfsAuthenticateVerb {
if lfsVerb == "upload" {
requestedMode = models.AccessModeWrite
} else if lfsVerb == "download" {
requestedMode = models.AccessModeRead
} else {
fail("Unknown LFS verb", "Unknown lfs verb %s", lfsVerb)
}
}
// Prohibit push to mirror repositories.
if requestedMode > models.AccessModeRead && repo.IsMirror {
fail("mirror repository is read-only", "")
}
// Allow anonymous clone for public repositories.
var (
keyID int64
user *models.User
)
if requestedMode == models.AccessModeWrite || repo.IsPrivate {
keys := strings.Split(c.Args()[0], "-")
if len(keys) != 2 {
fail("Key ID format error", "Invalid key argument: %s", c.Args()[0])
}
key, err := models.GetPublicKeyByID(com.StrTo(keys[1]).MustInt64())
if err != nil {
fail("Invalid key ID", "Invalid key ID[%s]: %v", c.Args()[0], err)
}
keyID = key.ID
// Check deploy key or user key.
if key.Type == models.KeyTypeDeploy {
if key.Mode < requestedMode {
fail("Key permission denied", "Cannot push with deployment key: %d", key.ID)
}
// Check if this deploy key belongs to current repository.
if !models.HasDeployKey(key.ID, repo.ID) {
fail("Key access denied", "Deploy key access denied: [key_id: %d, repo_id: %d]", key.ID, repo.ID)
}
// Update deploy key activity.
deployKey, err := models.GetDeployKeyByRepo(key.ID, repo.ID)
if err != nil {
fail("Internal error", "GetDeployKey: %v", err)
}
deployKey.UpdatedUnix = util.TimeStampNow()
if err = models.UpdateDeployKeyCols(deployKey, "updated_unix"); err != nil {
fail("Internal error", "UpdateDeployKey: %v", err)
}
} else {
user, err = models.GetUserByKeyID(key.ID)
if err != nil {
fail("internal error", "Failed to get user by key ID(%d): %v", keyID, err)
}
if !user.IsActive || user.ProhibitLogin {
fail("Your account is not active or has been disabled by Administrator",
"User %s is disabled and have no access to repository %s",
user.Name, repoPath)
}
mode, err := models.AccessLevel(user.ID, repo)
if err != nil {
fail("Internal error", "Failed to check access: %v", err)
} else if mode < requestedMode {
clientMessage := accessDenied
if mode >= models.AccessModeRead {
clientMessage = "You do not have sufficient authorization for this action"
}
fail(clientMessage,
"User %s does not have level %v access to repository %s",
user.Name, requestedMode, repoPath)
}
if !repo.CheckUnitUser(user.ID, user.IsAdmin, unitType) {
fail("You do not have allowed for this action",
"User %s does not have allowed access to repository %s 's code",
user.Name, repoPath)
}
os.Setenv(models.EnvPusherName, user.Name)
os.Setenv(models.EnvPusherID, fmt.Sprintf("%d", user.ID))
}
}
//LFS token authentication
if verb == lfsAuthenticateVerb {
url := fmt.Sprintf("%s%s/%s.git/info/lfs", setting.AppURL, username, repo.Name)
now := time.Now()
claims := jwt.MapClaims{
"repo": repo.ID,
"op": lfsVerb,
"exp": now.Add(5 * time.Minute).Unix(),
"nbf": now.Unix(),
}
if user != nil {
claims["user"] = user.ID
}
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
// Sign and get the complete encoded token as a string using the secret
tokenString, err := token.SignedString(setting.LFS.JWTSecretBytes)
if err != nil {
fail("Internal error", "Failed to sign JWT token: %v", err)
}
tokenAuthentication := &models.LFSTokenResponse{
Header: make(map[string]string),
Href: url,
}
tokenAuthentication.Header["Authorization"] = fmt.Sprintf("Bearer %s", tokenString)
enc := json.NewEncoder(os.Stdout)
err = enc.Encode(tokenAuthentication)
if err != nil {
fail("Internal error", "Failed to encode LFS json response: %v", err)
}
return nil
}
// Special handle for Windows.
if setting.IsWindows {
verb = strings.Replace(verb, "-", " ", 1)
}
var gitcmd *exec.Cmd
verbs := strings.Split(verb, " ")
if len(verbs) == 2 {
gitcmd = exec.Command(verbs[0], verbs[1], repoPath)
} else {
gitcmd = exec.Command(verb, repoPath)
}
if isWiki {
if err = repo.InitWiki(); err != nil {
fail("Internal error", "Failed to init wiki repo: %v", err)
}
}
os.Setenv(models.ProtectedBranchRepoID, fmt.Sprintf("%d", repo.ID))
gitcmd.Dir = setting.RepoRootPath
gitcmd.Stdout = os.Stdout
gitcmd.Stdin = os.Stdin
gitcmd.Stderr = os.Stderr
if err = gitcmd.Run(); err != nil {
fail("Internal error", "Failed to execute git command: %v", err)
}
// Update user key activity.
if keyID > 0 {
if err = private.UpdatePublicKeyUpdated(keyID); err != nil {
fail("Internal error", "UpdatePublicKey: %v", err)
}
}
return nil
}