forgejo/cmd/serv.go
zeripath 1bf40ca0df
Gitea serv, hooks, manager and the like should always display Fatals (#13032)
The gitea cmd/serv.go setup function deletes the console logger to
prevent stdout interference with commands. However, the problem is that
it then calls setting.NewContext which may cause an exit with log.Fatal
- which will then not be shown.

Now, log.Fatal is so disastrous that the interference that logging
causes is wanted. However, we can avoid stdout interference by emitting
on stderr.

This PR forces the creation of a console logger on stderr listening on
Fatal for these commands. Most commands have a `--debug` option now that
will print more reasons too - however, defaulting to give the log for
Fatal seems reasonable.

Signed-off-by: Andrew Thornton <art27@cantab.net>
2020-10-07 16:44:16 -04:00

290 lines
8.2 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/lfs"
"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/kballard/go-shellquote"
"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) {
_ = log.DelLogger("console")
if debug {
_ = log.NewLogger(1000, "console", "console", `{"level":"trace","stacktracelevel":"NONE","stderr":true}`)
} else {
_ = log.NewLogger(1000, "console", "console", `{"level":"fatal","stacktracelevel":"NONE","stderr":true}`)
}
setting.NewContext()
if debug {
setting.ProdMode = false
}
}
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
} else if c.Bool("debug") {
log.Debug("SSH_ORIGINAL_COMMAND: %s", os.Getenv("SSH_ORIGINAL_COMMAND"))
}
words, err := shellquote.Split(cmd)
if err != nil {
fail("Error parsing arguments", "Failed to parse arguments: %v", err)
}
if len(words) < 2 {
fail("Too few arguments", "Too few arguments in cmd: %s", cmd)
}
verb := words[0]
repoPath := words[1]
if repoPath[0] == '/' {
repoPath = repoPath[1:]
}
var lfsVerb string
if verb == lfsAuthenticateVerb {
if !setting.LFS.StartServer {
fail("Unknown git command", "LFS authentication request over SSH denied, LFS support is disabled")
}
if len(words) > 2 {
lfsVerb = words[2]
}
}
// LowerCase and trim the repoPath as that's how they are stored.
repoPath = strings.ToLower(strings.TrimSpace(repoPath))
rr := strings.SplitN(repoPath, "/", 2)
if len(rr) != 2 {
fail("Invalid repository path", "Invalid repository path: %v", repoPath)
}
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.EnvPusherEmail, results.UserEmail)
os.Setenv(models.EnvPusherID, strconv.FormatInt(results.UserID, 10))
os.Setenv(models.EnvRepoID, strconv.FormatInt(results.RepoID, 10))
os.Setenv(models.EnvPRID, fmt.Sprintf("%d", 0))
os.Setenv(models.EnvIsDeployKey, fmt.Sprintf("%t", results.IsDeployKey))
os.Setenv(models.EnvKeyID, fmt.Sprintf("%d", results.KeyID))
os.Setenv(models.EnvAppURL, setting.AppURL)
//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 := lfs.Claims{
StandardClaims: jwt.StandardClaims{
ExpiresAt: now.Add(setting.LFS.HTTPAuthExpiry).Unix(),
NotBefore: now.Unix(),
},
RepoID: results.RepoID,
Op: lfsVerb,
UserID: 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
}