mirror of
https://codeberg.org/forgejo/forgejo.git
synced 2024-12-05 03:28:56 +00:00
725 lines
19 KiB
Go
725 lines
19 KiB
Go
// Copyright 2014 The Gogs Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package models
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import (
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"bufio"
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"encoding/base64"
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"encoding/binary"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"path"
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"path/filepath"
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"strings"
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"sync"
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"time"
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"github.com/Unknwon/com"
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"github.com/go-xorm/xorm"
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"github.com/gogits/gogs/modules/log"
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"github.com/gogits/gogs/modules/process"
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"github.com/gogits/gogs/modules/setting"
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)
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const (
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// "### autogenerated by gitgos, DO NOT EDIT\n"
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_TPL_PUBLICK_KEY = `command="%s serv key-%d --config='%s'",no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty %s` + "\n"
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)
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var sshOpLocker = sync.Mutex{}
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var SSHPath string // SSH directory.
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// homeDir returns the home directory of current user.
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func homeDir() string {
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home, err := com.HomeDir()
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if err != nil {
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log.Fatal(4, "Fail to get home directory: %v", err)
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}
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return home
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}
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func init() {
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// Determine and create .ssh path.
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SSHPath = filepath.Join(homeDir(), ".ssh")
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if err := os.MkdirAll(SSHPath, 0700); err != nil {
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log.Fatal(4, "fail to create '%s': %v", SSHPath, err)
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}
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}
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type KeyType int
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const (
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KEY_TYPE_USER = iota + 1
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KEY_TYPE_DEPLOY
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)
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// PublicKey represents a SSH or deploy key.
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type PublicKey struct {
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ID int64 `xorm:"pk autoincr"`
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OwnerID int64 `xorm:"INDEX NOT NULL"`
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Name string `xorm:"NOT NULL"`
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Fingerprint string `xorm:"NOT NULL"`
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Content string `xorm:"TEXT NOT NULL"`
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Mode AccessMode `xorm:"NOT NULL DEFAULT 2"`
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Type KeyType `xorm:"NOT NULL DEFAULT 1"`
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Created time.Time `xorm:"CREATED"`
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Updated time.Time // Note: Updated must below Created for AfterSet.
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HasRecentActivity bool `xorm:"-"`
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HasUsed bool `xorm:"-"`
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}
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func (k *PublicKey) AfterSet(colName string, _ xorm.Cell) {
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switch colName {
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case "created":
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k.HasUsed = k.Updated.After(k.Created)
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k.HasRecentActivity = k.Updated.Add(7 * 24 * time.Hour).After(time.Now())
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}
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}
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// OmitEmail returns content of public key but without e-mail address.
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func (k *PublicKey) OmitEmail() string {
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return strings.Join(strings.Split(k.Content, " ")[:2], " ")
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}
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// GetAuthorizedString generates and returns formatted public key string for authorized_keys file.
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func (key *PublicKey) GetAuthorizedString() string {
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return fmt.Sprintf(_TPL_PUBLICK_KEY, setting.AppPath, key.ID, setting.CustomConf, key.Content)
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}
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func extractTypeFromBase64Key(key string) (string, error) {
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b, err := base64.StdEncoding.DecodeString(key)
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if err != nil || len(b) < 4 {
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return "", errors.New("Invalid key format")
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}
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keyLength := int(binary.BigEndian.Uint32(b))
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if len(b) < 4+keyLength {
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return "", errors.New("Invalid key format")
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}
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return string(b[4 : 4+keyLength]), nil
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}
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// parseKeyString parses any key string in openssh or ssh2 format to clean openssh string (rfc4253)
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func parseKeyString(content string) (string, error) {
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// Transform all legal line endings to a single "\n"
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s := strings.Replace(strings.Replace(strings.TrimSpace(content), "\r\n", "\n", -1), "\r", "\n", -1)
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lines := strings.Split(s, "\n")
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var keyType, keyContent, keyComment string
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if len(lines) == 1 {
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// Parse openssh format
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parts := strings.SplitN(lines[0], " ", 3)
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switch len(parts) {
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case 0:
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return "", errors.New("Empty key")
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case 1:
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keyContent = parts[0]
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case 2:
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keyType = parts[0]
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keyContent = parts[1]
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default:
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keyType = parts[0]
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keyContent = parts[1]
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keyComment = parts[2]
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}
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// If keyType is not given, extract it from content. If given, validate it
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if len(keyType) == 0 {
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if t, err := extractTypeFromBase64Key(keyContent); err == nil {
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keyType = t
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} else {
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return "", err
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}
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} else {
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if t, err := extractTypeFromBase64Key(keyContent); err != nil || keyType != t {
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return "", err
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}
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}
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} else {
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// Parse SSH2 file format.
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continuationLine := false
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for _, line := range lines {
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// Skip lines that:
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// 1) are a continuation of the previous line,
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// 2) contain ":" as that are comment lines
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// 3) contain "-" as that are begin and end tags
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if continuationLine || strings.ContainsAny(line, ":-") {
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continuationLine = strings.HasSuffix(line, "\\")
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} else {
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keyContent = keyContent + line
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}
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}
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if t, err := extractTypeFromBase64Key(keyContent); err == nil {
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keyType = t
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} else {
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return "", err
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}
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}
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return keyType + " " + keyContent + " " + keyComment, nil
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}
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// CheckPublicKeyString checks if the given public key string is recognized by SSH.
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func CheckPublicKeyString(content string) (_ string, err error) {
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content, err = parseKeyString(content)
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if err != nil {
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return "", err
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}
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content = strings.TrimRight(content, "\n\r")
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if strings.ContainsAny(content, "\n\r") {
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return "", errors.New("only a single line with a single key please")
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}
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// write the key to a file…
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tmpFile, err := ioutil.TempFile(os.TempDir(), "keytest")
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if err != nil {
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return "", err
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}
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tmpPath := tmpFile.Name()
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defer os.Remove(tmpPath)
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tmpFile.WriteString(content)
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tmpFile.Close()
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// Check if ssh-keygen recognizes its contents.
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stdout, stderr, err := process.Exec("CheckPublicKeyString", "ssh-keygen", "-lf", tmpPath)
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if err != nil {
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return "", errors.New("ssh-keygen -lf: " + stderr)
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} else if len(stdout) < 2 {
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return "", errors.New("ssh-keygen returned not enough output to evaluate the key: " + stdout)
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}
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// The ssh-keygen in Windows does not print key type, so no need go further.
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if setting.IsWindows {
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return content, nil
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}
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sshKeygenOutput := strings.Split(stdout, " ")
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if len(sshKeygenOutput) < 4 {
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return content, ErrKeyUnableVerify{stdout}
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}
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// Check if key type and key size match.
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if !setting.Service.DisableMinimumKeySizeCheck {
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keySize := com.StrTo(sshKeygenOutput[0]).MustInt()
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if keySize == 0 {
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return "", errors.New("cannot get key size of the given key")
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}
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keyType := strings.Trim(sshKeygenOutput[len(sshKeygenOutput)-1], " ()\n")
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if minimumKeySize := setting.Service.MinimumKeySizes[keyType]; minimumKeySize == 0 {
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return "", fmt.Errorf("unrecognized public key type: %s", keyType)
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} else if keySize < minimumKeySize {
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return "", fmt.Errorf("the minimum accepted size of a public key %s is %d", keyType, minimumKeySize)
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}
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}
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return content, nil
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}
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// saveAuthorizedKeyFile writes SSH key content to authorized_keys file.
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func saveAuthorizedKeyFile(keys ...*PublicKey) error {
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sshOpLocker.Lock()
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defer sshOpLocker.Unlock()
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fpath := filepath.Join(SSHPath, "authorized_keys")
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f, err := os.OpenFile(fpath, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0600)
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if err != nil {
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return err
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}
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defer f.Close()
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fi, err := f.Stat()
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if err != nil {
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return err
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}
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// FIXME: following command does not support in Windows.
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if !setting.IsWindows {
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// .ssh directory should have mode 700, and authorized_keys file should have mode 600.
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if fi.Mode().Perm() > 0600 {
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log.Error(4, "authorized_keys file has unusual permission flags: %s - setting to -rw-------", fi.Mode().Perm().String())
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if err = f.Chmod(0600); err != nil {
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return err
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}
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}
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}
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for _, key := range keys {
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if _, err = f.WriteString(key.GetAuthorizedString()); err != nil {
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return err
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}
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}
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return nil
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}
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// checkKeyContent onlys checks if key content has been used as public key,
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// it is OK to use same key as deploy key for multiple repositories/users.
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func checkKeyContent(content string) error {
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has, err := x.Get(&PublicKey{
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Content: content,
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Type: KEY_TYPE_USER,
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})
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if err != nil {
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return err
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} else if has {
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return ErrKeyAlreadyExist{0, content}
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}
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return nil
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}
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func addKey(e Engine, key *PublicKey) (err error) {
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// Calculate fingerprint.
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tmpPath := strings.Replace(path.Join(os.TempDir(), fmt.Sprintf("%d", time.Now().Nanosecond()),
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"id_rsa.pub"), "\\", "/", -1)
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os.MkdirAll(path.Dir(tmpPath), os.ModePerm)
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if err = ioutil.WriteFile(tmpPath, []byte(key.Content), 0644); err != nil {
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return err
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}
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stdout, stderr, err := process.Exec("AddPublicKey", "ssh-keygen", "-lf", tmpPath)
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if err != nil {
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return errors.New("ssh-keygen -lf: " + stderr)
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} else if len(stdout) < 2 {
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return errors.New("not enough output for calculating fingerprint: " + stdout)
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}
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key.Fingerprint = strings.Split(stdout, " ")[1]
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// Save SSH key.
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if _, err = e.Insert(key); err != nil {
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return err
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}
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// Don't need to rewrite this file if builtin SSH server is enabled.
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if setting.StartSSHServer {
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return nil
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}
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return saveAuthorizedKeyFile(key)
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}
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// AddPublicKey adds new public key to database and authorized_keys file.
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func AddPublicKey(ownerID int64, name, content string) (*PublicKey, error) {
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if err := checkKeyContent(content); err != nil {
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return nil, err
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}
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// Key name of same user cannot be duplicated.
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has, err := x.Where("owner_id=? AND name=?", ownerID, name).Get(new(PublicKey))
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if err != nil {
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return nil, err
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} else if has {
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return nil, ErrKeyNameAlreadyUsed{ownerID, name}
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}
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sess := x.NewSession()
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defer sessionRelease(sess)
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if err = sess.Begin(); err != nil {
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return nil, err
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}
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key := &PublicKey{
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OwnerID: ownerID,
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Name: name,
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Content: content,
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Mode: ACCESS_MODE_WRITE,
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Type: KEY_TYPE_USER,
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}
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if err = addKey(sess, key); err != nil {
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return nil, fmt.Errorf("addKey: %v", err)
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}
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return key, sess.Commit()
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}
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// GetPublicKeyByID returns public key by given ID.
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func GetPublicKeyByID(keyID int64) (*PublicKey, error) {
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key := new(PublicKey)
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has, err := x.Id(keyID).Get(key)
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if err != nil {
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return nil, err
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} else if !has {
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return nil, ErrKeyNotExist{keyID}
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}
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return key, nil
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}
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// SearchPublicKeyByContent searches content as prefix (leak e-mail part)
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// and returns public key found.
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func SearchPublicKeyByContent(content string) (*PublicKey, error) {
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key := new(PublicKey)
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has, err := x.Where("content like ?", content+"%").Get(key)
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if err != nil {
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return nil, err
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} else if !has {
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return nil, ErrKeyNotExist{}
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}
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return key, nil
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}
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// ListPublicKeys returns a list of public keys belongs to given user.
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func ListPublicKeys(uid int64) ([]*PublicKey, error) {
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keys := make([]*PublicKey, 0, 5)
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return keys, x.Where("owner_id=?", uid).Find(&keys)
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}
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// rewriteAuthorizedKeys finds and deletes corresponding line in authorized_keys file.
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func rewriteAuthorizedKeys(key *PublicKey, p, tmpP string) error {
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fr, err := os.Open(p)
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if err != nil {
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return err
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}
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defer fr.Close()
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fw, err := os.OpenFile(tmpP, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0600)
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if err != nil {
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return err
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}
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defer fw.Close()
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isFound := false
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keyword := fmt.Sprintf("key-%d", key.ID)
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buf := bufio.NewReader(fr)
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for {
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line, errRead := buf.ReadString('\n')
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line = strings.TrimSpace(line)
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if errRead != nil {
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if errRead != io.EOF {
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return errRead
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}
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// Reached end of file, if nothing to read then break,
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// otherwise handle the last line.
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if len(line) == 0 {
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break
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}
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}
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// Found the line and copy rest of file.
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if !isFound && strings.Contains(line, keyword) && strings.Contains(line, key.Content) {
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isFound = true
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continue
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}
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// Still finding the line, copy the line that currently read.
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if _, err = fw.WriteString(line + "\n"); err != nil {
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return err
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}
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if errRead == io.EOF {
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break
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}
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}
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return nil
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}
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// UpdatePublicKey updates given public key.
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func UpdatePublicKey(key *PublicKey) error {
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_, err := x.Id(key.ID).AllCols().Update(key)
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return err
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}
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func deletePublicKey(e *xorm.Session, keyID int64) error {
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sshOpLocker.Lock()
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defer sshOpLocker.Unlock()
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key := &PublicKey{ID: keyID}
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has, err := e.Get(key)
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if err != nil {
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return err
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} else if !has {
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return nil
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}
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if _, err = e.Id(key.ID).Delete(new(PublicKey)); err != nil {
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return err
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}
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// Don't need to rewrite this file if builtin SSH server is enabled.
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if setting.StartSSHServer {
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return nil
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}
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fpath := filepath.Join(SSHPath, "authorized_keys")
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tmpPath := filepath.Join(SSHPath, "authorized_keys.tmp")
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if err = rewriteAuthorizedKeys(key, fpath, tmpPath); err != nil {
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return err
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} else if err = os.Remove(fpath); err != nil {
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return err
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}
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return os.Rename(tmpPath, fpath)
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}
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// DeletePublicKey deletes SSH key information both in database and authorized_keys file.
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func DeletePublicKey(doer *User, id int64) (err error) {
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key, err := GetPublicKeyByID(id)
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if err != nil {
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if IsErrKeyNotExist(err) {
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return nil
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}
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return fmt.Errorf("GetPublicKeyByID: %v", err)
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}
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// Check if user has access to delete this key.
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if !doer.IsAdmin && doer.Id != key.OwnerID {
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return ErrKeyAccessDenied{doer.Id, key.ID, "public"}
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}
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sess := x.NewSession()
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defer sessionRelease(sess)
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if err = sess.Begin(); err != nil {
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return err
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}
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if err = deletePublicKey(sess, id); err != nil {
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return err
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}
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return sess.Commit()
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}
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// RewriteAllPublicKeys removes any authorized key and rewrite all keys from database again.
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func RewriteAllPublicKeys() error {
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sshOpLocker.Lock()
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defer sshOpLocker.Unlock()
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tmpPath := filepath.Join(SSHPath, "authorized_keys.tmp")
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f, err := os.OpenFile(tmpPath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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return err
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}
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defer os.Remove(tmpPath)
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err = x.Iterate(new(PublicKey), func(idx int, bean interface{}) (err error) {
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_, err = f.WriteString((bean.(*PublicKey)).GetAuthorizedString())
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return err
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})
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f.Close()
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if err != nil {
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return err
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}
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fpath := filepath.Join(SSHPath, "authorized_keys")
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if com.IsExist(fpath) {
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if err = os.Remove(fpath); err != nil {
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return err
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}
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}
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if err = os.Rename(tmpPath, fpath); err != nil {
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return err
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}
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return nil
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}
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|
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// ________ .__ ____ __.
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// \______ \ ____ ______ | | ____ ___.__.| |/ _|____ ___.__.
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// | | \_/ __ \\____ \| | / _ < | || <_/ __ < | |
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// | ` \ ___/| |_> > |_( <_> )___ || | \ ___/\___ |
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// /_______ /\___ > __/|____/\____// ____||____|__ \___ > ____|
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// \/ \/|__| \/ \/ \/\/
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|
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// DeployKey represents deploy key information and its relation with repository.
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type DeployKey struct {
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ID int64 `xorm:"pk autoincr"`
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KeyID int64 `xorm:"UNIQUE(s) INDEX"`
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RepoID int64 `xorm:"UNIQUE(s) INDEX"`
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Name string
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Fingerprint string
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Content string `xorm:"-"`
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Created time.Time `xorm:"CREATED"`
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Updated time.Time // Note: Updated must below Created for AfterSet.
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HasRecentActivity bool `xorm:"-"`
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HasUsed bool `xorm:"-"`
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}
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func (k *DeployKey) AfterSet(colName string, _ xorm.Cell) {
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switch colName {
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case "created":
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k.HasUsed = k.Updated.After(k.Created)
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k.HasRecentActivity = k.Updated.Add(7 * 24 * time.Hour).After(time.Now())
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}
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}
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// GetContent gets associated public key content.
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func (k *DeployKey) GetContent() error {
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pkey, err := GetPublicKeyByID(k.KeyID)
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if err != nil {
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return err
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}
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k.Content = pkey.Content
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return nil
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}
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func checkDeployKey(e Engine, keyID, repoID int64, name string) error {
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// Note: We want error detail, not just true or false here.
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has, err := e.Where("key_id=? AND repo_id=?", keyID, repoID).Get(new(DeployKey))
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if err != nil {
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return err
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} else if has {
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return ErrDeployKeyAlreadyExist{keyID, repoID}
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}
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has, err = e.Where("repo_id=? AND name=?", repoID, name).Get(new(DeployKey))
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if err != nil {
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return err
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} else if has {
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return ErrDeployKeyNameAlreadyUsed{repoID, name}
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}
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return nil
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}
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// addDeployKey adds new key-repo relation.
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func addDeployKey(e *xorm.Session, keyID, repoID int64, name, fingerprint string) (*DeployKey, error) {
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if err := checkDeployKey(e, keyID, repoID, name); err != nil {
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return nil, err
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}
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key := &DeployKey{
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KeyID: keyID,
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RepoID: repoID,
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Name: name,
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Fingerprint: fingerprint,
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}
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_, err := e.Insert(key)
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return key, err
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}
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// HasDeployKey returns true if public key is a deploy key of given repository.
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func HasDeployKey(keyID, repoID int64) bool {
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has, _ := x.Where("key_id=? AND repo_id=?", keyID, repoID).Get(new(DeployKey))
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return has
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}
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// AddDeployKey add new deploy key to database and authorized_keys file.
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func AddDeployKey(repoID int64, name, content string) (*DeployKey, error) {
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if err := checkKeyContent(content); err != nil {
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return nil, err
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}
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pkey := &PublicKey{
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Content: content,
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Mode: ACCESS_MODE_READ,
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Type: KEY_TYPE_DEPLOY,
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}
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has, err := x.Get(pkey)
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if err != nil {
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return nil, err
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}
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sess := x.NewSession()
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defer sessionRelease(sess)
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if err = sess.Begin(); err != nil {
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return nil, err
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}
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// First time use this deploy key.
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if !has {
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if err = addKey(sess, pkey); err != nil {
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return nil, fmt.Errorf("addKey: %v", err)
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}
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}
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key, err := addDeployKey(sess, pkey.ID, repoID, name, pkey.Fingerprint)
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if err != nil {
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return nil, fmt.Errorf("addDeployKey: %v", err)
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}
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return key, sess.Commit()
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}
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// GetDeployKeyByID returns deploy key by given ID.
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func GetDeployKeyByID(id int64) (*DeployKey, error) {
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key := new(DeployKey)
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has, err := x.Id(id).Get(key)
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if err != nil {
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return nil, err
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} else if !has {
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return nil, ErrDeployKeyNotExist{id, 0, 0}
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}
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return key, nil
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}
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// GetDeployKeyByRepo returns deploy key by given public key ID and repository ID.
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func GetDeployKeyByRepo(keyID, repoID int64) (*DeployKey, error) {
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key := &DeployKey{
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KeyID: keyID,
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RepoID: repoID,
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}
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has, err := x.Get(key)
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if err != nil {
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return nil, err
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} else if !has {
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return nil, ErrDeployKeyNotExist{0, keyID, repoID}
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}
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return key, nil
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}
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// UpdateDeployKey updates deploy key information.
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func UpdateDeployKey(key *DeployKey) error {
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_, err := x.Id(key.ID).AllCols().Update(key)
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return err
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}
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// DeleteDeployKey deletes deploy key from its repository authorized_keys file if needed.
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func DeleteDeployKey(doer *User, id int64) error {
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key, err := GetDeployKeyByID(id)
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if err != nil {
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if IsErrDeployKeyNotExist(err) {
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return nil
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}
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return fmt.Errorf("GetDeployKeyByID: %v", err)
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}
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// Check if user has access to delete this key.
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if !doer.IsAdmin {
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repo, err := GetRepositoryByID(key.RepoID)
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if err != nil {
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return fmt.Errorf("GetRepositoryByID: %v", err)
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}
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yes, err := HasAccess(doer, repo, ACCESS_MODE_ADMIN)
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if err != nil {
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return fmt.Errorf("HasAccess: %v", err)
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} else if !yes {
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return ErrKeyAccessDenied{doer.Id, key.ID, "deploy"}
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}
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}
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sess := x.NewSession()
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defer sessionRelease(sess)
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if err = sess.Begin(); err != nil {
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return err
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}
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if _, err = sess.Id(key.ID).Delete(new(DeployKey)); err != nil {
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return fmt.Errorf("delete deploy key[%d]: %v", key.ID, err)
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}
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// Check if this is the last reference to same key content.
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has, err := sess.Where("key_id=?", key.KeyID).Get(new(DeployKey))
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if err != nil {
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return err
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} else if !has {
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if err = deletePublicKey(sess, key.KeyID); err != nil {
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return err
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}
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}
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return sess.Commit()
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}
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// ListDeployKeys returns all deploy keys by given repository ID.
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func ListDeployKeys(repoID int64) ([]*DeployKey, error) {
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keys := make([]*DeployKey, 0, 5)
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return keys, x.Where("repo_id=?", repoID).Find(&keys)
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}
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