forgejo/cmd/serv.go
John Olheiser 95013fde60
Fix push-create SSH bugs (#10145)
* Attempt to fix push-create SSH bugs

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Fix binding

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Invalid ctx

Signed-off-by: jolheiser <john.olheiser@gmail.com>
2020-02-05 10:40:35 +01:00

275 lines
7.6 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"
"net/http"
"net/url"
"os"
"os/exec"
"regexp"
"strconv"
"strings"
"time"
"code.gitea.io/gitea/models"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/pprof"
"code.gitea.io/gitea/modules/private"
"code.gitea.io/gitea/modules/setting"
"github.com/dgrijalva/jwt-go"
"github.com/unknwon/com"
"github.com/urfave/cli"
)
const (
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.BoolFlag{
Name: "enable-pprof",
},
cli.BoolFlag{
Name: "debug",
},
},
}
func setup(logPath string, debug bool) {
if !debug {
_ = log.DelLogger("console")
}
setting.NewContext()
if debug {
setting.ProdMode = false
}
}
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,
}
alphaDashDotPattern = regexp.MustCompile(`[^\w-\.]`)
)
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...)
}
}
os.Exit(1)
}
func runServ(c *cli.Context) error {
// FIXME: This needs to internationalised
setup("serv.log", c.Bool("debug"))
if setting.SSH.Disabled {
println("Gitea: SSH has been disabled")
return nil
}
if len(c.Args()) < 1 {
if err := cli.ShowSubcommandHelp(c); err != nil {
fmt.Printf("error showing subcommand help: %v\n", err)
}
return nil
}
keys := strings.Split(c.Args()[0], "-")
if len(keys) != 2 || keys[0] != "key" {
fail("Key ID format error", "Invalid key argument: %s", c.Args()[0])
}
keyID := com.StrTo(keys[1]).MustInt64()
cmd := os.Getenv("SSH_ORIGINAL_COMMAND")
if len(cmd) == 0 {
key, user, err := private.ServNoCommand(keyID)
if err != nil {
fail("Internal error", "Failed to check provided key: %v", err)
}
if key.Type == models.KeyTypeDeploy {
println("Hi there! You've successfully authenticated with the deploy key named " + key.Name + ", but Gitea does not provide shell access.")
} else {
println("Hi there, " + user.Name + "! You've successfully authenticated with the key named " + key.Name + ", 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"))
if alphaDashDotPattern.MatchString(reponame) {
fail("Invalid repo name", "Invalid repo name: %s", reponame)
}
if setting.EnablePprof || c.Bool("enable-pprof") {
if err := os.MkdirAll(setting.PprofDataPath, os.ModePerm); err != nil {
fail("Error while trying to create PPROF_DATA_PATH", "Error while trying to create PPROF_DATA_PATH: %v", err)
}
stopCPUProfiler, err := pprof.DumpCPUProfileForUsername(setting.PprofDataPath, username)
if err != nil {
fail("Internal Server Error", "Unable to start CPU profile: %v", err)
}
defer func() {
stopCPUProfiler()
err := pprof.DumpMemProfileForUsername(setting.PprofDataPath, username)
if err != nil {
fail("Internal Server Error", "Unable to dump Mem Profile: %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)
}
}
results, err := private.ServCommand(keyID, username, reponame, requestedMode, verb, lfsVerb)
if err != nil {
if private.IsErrServCommand(err) {
errServCommand := err.(private.ErrServCommand)
if errServCommand.StatusCode != http.StatusInternalServerError {
fail("Unauthorized", "%s", errServCommand.Error())
} else {
fail("Internal Server Error", "%s", errServCommand.Error())
}
}
fail("Internal Server Error", "%s", err.Error())
}
os.Setenv(models.EnvRepoIsWiki, strconv.FormatBool(results.IsWiki))
os.Setenv(models.EnvRepoName, results.RepoName)
os.Setenv(models.EnvRepoUsername, results.OwnerName)
os.Setenv(models.EnvPusherName, results.UserName)
os.Setenv(models.EnvPusherID, strconv.FormatInt(results.UserID, 10))
os.Setenv(models.ProtectedBranchRepoID, strconv.FormatInt(results.RepoID, 10))
os.Setenv(models.ProtectedBranchPRID, fmt.Sprintf("%d", 0))
os.Setenv(models.EnvIsDeployKey, fmt.Sprintf("%t", results.IsDeployKey))
os.Setenv(models.EnvKeyID, fmt.Sprintf("%d", results.KeyID))
//LFS token authentication
if verb == lfsAuthenticateVerb {
url := fmt.Sprintf("%s%s/%s.git/info/lfs", setting.AppURL, url.PathEscape(results.OwnerName), url.PathEscape(results.RepoName))
now := time.Now()
claims := jwt.MapClaims{
"repo": results.RepoID,
"op": lfsVerb,
"exp": now.Add(setting.LFS.HTTPAuthExpiry).Unix(),
"nbf": now.Unix(),
"user": results.UserID,
}
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)
}
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 results.KeyID > 0 {
if err = private.UpdatePublicKeyInRepo(results.KeyID, results.RepoID); err != nil {
fail("Internal error", "UpdatePublicKeyInRepo: %v", err)
}
}
return nil
}