mirror of
https://github.com/opencontainers/runc.git
synced 2026-07-12 09:46:25 +08:00
Alexander Morozov
993cbf9db0
This uses the standard go vendor location instead of old Godeps location. Also remove usage of symlink GOPATH. Since our README mentions that you should build it inside GOPATH, i think its a reasonable to assume that you dont need to create a tmp GOPATH. Signed-off-by: Daniel Dao <dqminh89@gmail.com>
103 lines
2.4 KiB
Go
103 lines
2.4 KiB
Go
package dbus
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import (
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"bufio"
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"bytes"
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"crypto/rand"
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"crypto/sha1"
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"encoding/hex"
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"os"
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)
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// AuthCookieSha1 returns an Auth that authenticates as the given user with the
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// DBUS_COOKIE_SHA1 mechanism. The home parameter should specify the home
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// directory of the user.
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func AuthCookieSha1(user, home string) Auth {
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return authCookieSha1{user, home}
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}
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type authCookieSha1 struct {
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user, home string
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}
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func (a authCookieSha1) FirstData() ([]byte, []byte, AuthStatus) {
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b := make([]byte, 2*len(a.user))
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hex.Encode(b, []byte(a.user))
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return []byte("DBUS_COOKIE_SHA1"), b, AuthContinue
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}
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func (a authCookieSha1) HandleData(data []byte) ([]byte, AuthStatus) {
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challenge := make([]byte, len(data)/2)
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_, err := hex.Decode(challenge, data)
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if err != nil {
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return nil, AuthError
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}
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b := bytes.Split(challenge, []byte{' '})
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if len(b) != 3 {
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return nil, AuthError
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}
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context := b[0]
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id := b[1]
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svchallenge := b[2]
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cookie := a.getCookie(context, id)
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if cookie == nil {
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return nil, AuthError
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}
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clchallenge := a.generateChallenge()
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if clchallenge == nil {
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return nil, AuthError
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}
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hash := sha1.New()
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hash.Write(bytes.Join([][]byte{svchallenge, clchallenge, cookie}, []byte{':'}))
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hexhash := make([]byte, 2*hash.Size())
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hex.Encode(hexhash, hash.Sum(nil))
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data = append(clchallenge, ' ')
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data = append(data, hexhash...)
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resp := make([]byte, 2*len(data))
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hex.Encode(resp, data)
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return resp, AuthOk
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}
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// getCookie searches for the cookie identified by id in context and returns
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// the cookie content or nil. (Since HandleData can't return a specific error,
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// but only whether an error occured, this function also doesn't bother to
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// return an error.)
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func (a authCookieSha1) getCookie(context, id []byte) []byte {
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file, err := os.Open(a.home + "/.dbus-keyrings/" + string(context))
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if err != nil {
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return nil
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}
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defer file.Close()
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rd := bufio.NewReader(file)
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for {
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line, err := rd.ReadBytes('\n')
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if err != nil {
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return nil
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}
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line = line[:len(line)-1]
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b := bytes.Split(line, []byte{' '})
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if len(b) != 3 {
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return nil
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}
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if bytes.Equal(b[0], id) {
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return b[2]
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}
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}
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}
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// generateChallenge returns a random, hex-encoded challenge, or nil on error
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// (see above).
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func (a authCookieSha1) generateChallenge() []byte {
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b := make([]byte, 16)
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n, err := rand.Read(b)
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if err != nil {
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return nil
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}
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if n != 16 {
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return nil
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}
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enc := make([]byte, 32)
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hex.Encode(enc, b)
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return enc
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}
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