1 files changed, 228 insertions, 0 deletions
diff --git a/models/publickey.go b/models/publickey.go
new file mode 100644
index 00000000..ed47ff20
--- /dev/null
+++ b/models/publickey.go
@@ -0,0 +1,228 @@
+// Copyright 2014 The Gogs 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 models
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path"
+	"path/filepath"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/Unknwon/com"
+
+	"github.com/gogits/gogs/modules/log"
+)
+
+const (
+	// "### autogenerated by gitgos, DO NOT EDIT\n"
+	TPL_PUBLICK_KEY = `command="%s serv key-%d",no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty %s`
+)
+
+var (
+	ErrKeyAlreadyExist = errors.New("Public key already exist")
+)
+
+var sshOpLocker = sync.Mutex{}
+
+var (
+	sshPath string
+	appPath string
+)
+
+// exePath returns the executable path.
+func exePath() (string, error) {
+	file, err := exec.LookPath(os.Args[0])
+	if err != nil {
+		return "", err
+	}
+	return filepath.Abs(file)
+}
+
+// homeDir returns the home directory of current user.
+func homeDir() string {
+	home, err := com.HomeDir()
+	if err != nil {
+		return "/"
+	}
+	return home
+}
+
+func init() {
+	var err error
+
+	appPath, err = exePath()
+	if err != nil {
+		fmt.Printf("publickey.init(fail to get app path): %v\n", err)
+		os.Exit(2)
+	}
+
+	// Determine and create .ssh path.
+	sshPath = filepath.Join(homeDir(), ".ssh")
+	if err = os.MkdirAll(sshPath, os.ModePerm); err != nil {
+		fmt.Printf("publickey.init(fail to create sshPath(%s)): %v\n", sshPath, err)
+		os.Exit(2)
+	}
+}
+
+// PublicKey represents a SSH key of user.
+type PublicKey struct {
+	Id          int64
+	OwnerId     int64  `xorm:"unique(s) index not null"`
+	Name        string `xorm:"unique(s) not null"`
+	Fingerprint string
+	Content     string    `xorm:"TEXT not null"`
+	Created     time.Time `xorm:"created"`
+	Updated     time.Time `xorm:"updated"`
+}
+
+// GenAuthorizedKey returns formatted public key string.
+func GenAuthorizedKey(keyId int64, key string) string {
+	return fmt.Sprintf(TPL_PUBLICK_KEY+"\n", appPath, keyId, key)
+}
+
+// AddPublicKey adds new public key to database and SSH key file.
+func AddPublicKey(key *PublicKey) (err error) {
+	// Check if public key name has been used.
+	has, err := orm.Get(key)
+	if err != nil {
+		return err
+	} else if has {
+		return ErrKeyAlreadyExist
+	}
+
+	// Calculate fingerprint.
+	tmpPath := strings.Replace(filepath.Join(os.TempDir(), fmt.Sprintf("%d", time.Now().Nanosecond()),
+		"id_rsa.pub"), "\\", "/", -1)
+	os.MkdirAll(path.Dir(tmpPath), os.ModePerm)
+	if err = ioutil.WriteFile(tmpPath, []byte(key.Content), os.ModePerm); err != nil {
+		return err
+	}
+	stdout, _, err := com.ExecCmd("ssh-keygen", "-l", "-f", tmpPath)
+	if err != nil {
+		return err
+	} else if len(stdout) < 2 {
+		return errors.New("Not enough output for calculating fingerprint")
+	}
+	key.Fingerprint = strings.Split(stdout, " ")[1]
+
+	// Save SSH key.
+	if _, err = orm.Insert(key); err != nil {
+		return err
+	}
+	if err = SaveAuthorizedKeyFile(key); err != nil {
+		if _, err2 := orm.Delete(key); err2 != nil {
+			return err2
+		}
+		return err
+	}
+
+	return nil
+}
+
+func rewriteAuthorizedKeys(key *PublicKey, p, tmpP string) error {
+	// Delete SSH key in SSH key file.
+	sshOpLocker.Lock()
+	defer sshOpLocker.Unlock()
+
+	fr, err := os.Open(p)
+	if err != nil {
+		return err
+	}
+	defer fr.Close()
+
+	fw, err := os.Create(tmpP)
+	if err != nil {
+		return err
+	}
+	defer fw.Close()
+
+	buf := bufio.NewReader(fr)
+	for {
+		line, errRead := buf.ReadString('\n')
+		line = strings.TrimSpace(line)
+
+		if errRead != nil {
+			if errRead != io.EOF {
+				return errRead
+			}
+
+			// Reached end of file, if nothing to read then break,
+			// otherwise handle the last line.
+			if len(line) == 0 {
+				break
+			}
+		}
+
+		// Found the line and copy rest of file.
+		if strings.Contains(line, fmt.Sprintf("key-%d", key.Id)) && strings.Contains(line, key.Content) {
+			continue
+		}
+		// Still finding the line, copy the line that currently read.
+		if _, err = fw.WriteString(line + "\n"); err != nil {
+			return err
+		}
+
+		if errRead == io.EOF {
+			break
+		}
+	}
+	return nil
+}
+
+// DeletePublicKey deletes SSH key information both in database and authorized_keys file.
+func DeletePublicKey(key *PublicKey) (err error) {
+	// Delete SSH key in database.
+	has, err := orm.Id(key.Id).Get(key)
+	if err != nil {
+		return err
+	} else if !has {
+		return errors.New("Public key does not exist")
+	}
+	if _, err = orm.Delete(key); err != nil {
+		return err
+	}
+
+	p := filepath.Join(sshPath, "authorized_keys")
+	tmpP := filepath.Join(sshPath, "authorized_keys.tmp")
+	log.Trace("ssh.DeletePublicKey(authorized_keys): %s", p)
+
+	if err = rewriteAuthorizedKeys(key, p, tmpP); err != nil {
+		return err
+	} else if err = os.Remove(p); err != nil {
+		return err
+	}
+	return os.Rename(tmpP, p)
+}
+
+// ListPublicKey returns a list of public keys that user has.
+func ListPublicKey(userId int64) ([]PublicKey, error) {
+	keys := make([]PublicKey, 0)
+	err := orm.Find(&keys, &PublicKey{OwnerId: userId})
+	return keys, err
+}
+
+// SaveAuthorizedKeyFile writes SSH key content to SSH key file.
+func SaveAuthorizedKeyFile(key *PublicKey) error {
+	sshOpLocker.Lock()
+	defer sshOpLocker.Unlock()
+
+	p := filepath.Join(sshPath, "authorized_keys")
+	f, err := os.OpenFile(p, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0600)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	_, err = f.WriteString(GenAuthorizedKey(key.Id, key.Content))
+	return err
+}