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// Copyright 2021 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package asymkey
import (
"bufio"
"context"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"time"
"code.gitea.io/gitea/models/db"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/util"
)
// _____ __ .__ .__ .___
// / _ \ __ ___/ |_| |__ ___________|__|_______ ____ __| _/
// / /_\ \| | \ __\ | \ / _ \_ __ \ \___ // __ \ / __ |
// / | \ | /| | | Y ( <_> ) | \/ |/ /\ ___// /_/ |
// \____|__ /____/ |__| |___| /\____/|__| |__/_____ \\___ >____ |
// \/ \/ \/ \/ \/
// __________ .__ .__ .__
// \______ _______|__| ____ ____ |_____________ | | ______
// | ___\_ __ | |/ \_/ ___\| \____ \__ \ | | / ___/
// | | | | \| | | \ \___| | |_> / __ \| |__\___ \
// |____| |__| |__|___| /\___ |__| __(____ |____/____ >
// \/ \/ |__| \/ \/
//
// This file contains functions for creating authorized_principals files
//
// There is a dependence on the database within RewriteAllPrincipalKeys & RegeneratePrincipalKeys
// The sshOpLocker is used from ssh_key_authorized_keys.go
const authorizedPrincipalsFile = "authorized_principals"
// RewriteAllPrincipalKeys removes any authorized principal and rewrite all keys from database again.
// Note: db.GetEngine(ctx).Iterate does not get latest data after insert/delete, so we have to call this function
// outside any session scope independently.
func RewriteAllPrincipalKeys(ctx context.Context) error {
// Don't rewrite key if internal server
if setting.SSH.StartBuiltinServer || !setting.SSH.CreateAuthorizedPrincipalsFile {
return nil
}
sshOpLocker.Lock()
defer sshOpLocker.Unlock()
if setting.SSH.RootPath != "" {
// First of ensure that the RootPath is present, and if not make it with 0700 permissions
// This of course doesn't guarantee that this is the right directory for authorized_keys
// but at least if it's supposed to be this directory and it doesn't exist and we're the
// right user it will at least be created properly.
err := os.MkdirAll(setting.SSH.RootPath, 0o700)
if err != nil {
log.Error("Unable to MkdirAll(%s): %v", setting.SSH.RootPath, err)
return err
}
}
fPath := filepath.Join(setting.SSH.RootPath, authorizedPrincipalsFile)
tmpPath := fPath + ".tmp"
t, err := os.OpenFile(tmpPath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0o600)
if err != nil {
return err
}
defer func() {
t.Close()
os.Remove(tmpPath)
}()
if setting.SSH.AuthorizedPrincipalsBackup {
isExist, err := util.IsExist(fPath)
if err != nil {
log.Error("Unable to check if %s exists. Error: %v", fPath, err)
return err
}
if isExist {
bakPath := fmt.Sprintf("%s_%d.gitea_bak", fPath, time.Now().Unix())
if err = util.CopyFile(fPath, bakPath); err != nil {
return err
}
}
}
if err := regeneratePrincipalKeys(ctx, t); err != nil {
return err
}
if err := t.Sync(); err != nil {
return err
}
if err := t.Close(); err != nil {
return err
}
return util.Rename(tmpPath, fPath)
}
func regeneratePrincipalKeys(ctx context.Context, t io.StringWriter) error {
if err := db.GetEngine(ctx).Where("type = ?", KeyTypePrincipal).Iterate(new(PublicKey), func(idx int, bean any) (err error) {
_, err = t.WriteString((bean.(*PublicKey)).AuthorizedString())
return err
}); err != nil {
return err
}
fPath := filepath.Join(setting.SSH.RootPath, authorizedPrincipalsFile)
isExist, err := util.IsExist(fPath)
if err != nil {
log.Error("Unable to check if %s exists. Error: %v", fPath, err)
return err
}
if isExist {
f, err := os.Open(fPath)
if err != nil {
return err
}
defer f.Close()
scanner := bufio.NewScanner(f)
for scanner.Scan() {
line := scanner.Text()
if strings.HasPrefix(line, tplCommentPrefix) {
scanner.Scan()
continue
}
_, err = t.WriteString(line + "\n")
if err != nil {
return err
}
}
if err = scanner.Err(); err != nil {
return fmt.Errorf("regeneratePrincipalKeys scan: %w", err)
}
}
return nil
}
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