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package osxkeychain
/*
#cgo CFLAGS: -x objective-c -mmacosx-version-min=10.10
#cgo LDFLAGS: -framework Security -framework Foundation -mmacosx-version-min=10.10
#include "osxkeychain_darwin.h"
#include <stdlib.h>
*/
import "C"
import (
"errors"
"net/url"
"strconv"
"strings"
"unsafe"
"github.com/docker/docker-credential-helpers/credentials"
)
// errCredentialsNotFound is the specific error message returned by OS X
// when the credentials are not in the keychain.
const errCredentialsNotFound = "The specified item could not be found in the keychain."
// Osxkeychain handles secrets using the OS X Keychain as store.
type Osxkeychain struct{}
// Add adds new credentials to the keychain.
func (h Osxkeychain) Add(creds *credentials.Credentials) error {
h.Delete(creds.ServerURL)
s, err := splitServer(creds.ServerURL)
if err != nil {
return err
}
defer freeServer(s)
label := C.CString(credentials.CredsLabel)
defer C.free(unsafe.Pointer(label))
username := C.CString(creds.Username)
defer C.free(unsafe.Pointer(username))
secret := C.CString(creds.Secret)
defer C.free(unsafe.Pointer(secret))
errMsg := C.keychain_add(s, label, username, secret)
if errMsg != nil {
defer C.free(unsafe.Pointer(errMsg))
return errors.New(C.GoString(errMsg))
}
return nil
}
// Delete removes credentials from the keychain.
func (h Osxkeychain) Delete(serverURL string) error {
s, err := splitServer(serverURL)
if err != nil {
return err
}
defer freeServer(s)
errMsg := C.keychain_delete(s)
if errMsg != nil {
defer C.free(unsafe.Pointer(errMsg))
return errors.New(C.GoString(errMsg))
}
return nil
}
// Get returns the username and secret to use for a given registry server URL.
func (h Osxkeychain) Get(serverURL string) (string, string, error) {
s, err := splitServer(serverURL)
if err != nil {
return "", "", err
}
defer freeServer(s)
var usernameLen C.uint
var username *C.char
var secretLen C.uint
var secret *C.char
defer C.free(unsafe.Pointer(username))
defer C.free(unsafe.Pointer(secret))
errMsg := C.keychain_get(s, &usernameLen, &username, &secretLen, &secret)
if errMsg != nil {
defer C.free(unsafe.Pointer(errMsg))
goMsg := C.GoString(errMsg)
if goMsg == errCredentialsNotFound {
return "", "", credentials.NewErrCredentialsNotFound()
}
return "", "", errors.New(goMsg)
}
user := C.GoStringN(username, C.int(usernameLen))
pass := C.GoStringN(secret, C.int(secretLen))
return user, pass, nil
}
// List returns the stored URLs and corresponding usernames.
func (h Osxkeychain) List() (map[string]string, error) {
credsLabelC := C.CString(credentials.CredsLabel)
defer C.free(unsafe.Pointer(credsLabelC))
var pathsC **C.char
defer C.free(unsafe.Pointer(pathsC))
var acctsC **C.char
defer C.free(unsafe.Pointer(acctsC))
var listLenC C.uint
errMsg := C.keychain_list(credsLabelC, &pathsC, &acctsC, &listLenC)
if errMsg != nil {
defer C.free(unsafe.Pointer(errMsg))
goMsg := C.GoString(errMsg)
return nil, errors.New(goMsg)
}
defer C.freeListData(&pathsC, listLenC)
defer C.freeListData(&acctsC, listLenC)
var listLen int
listLen = int(listLenC)
pathTmp := (*[1 << 30]*C.char)(unsafe.Pointer(pathsC))[:listLen:listLen]
acctTmp := (*[1 << 30]*C.char)(unsafe.Pointer(acctsC))[:listLen:listLen]
//taking the array of c strings into go while ignoring all the stuff irrelevant to credentials-helper
resp := make(map[string]string)
for i := 0; i < listLen; i++ {
if C.GoString(pathTmp[i]) == "0" {
continue
}
resp[C.GoString(pathTmp[i])] = C.GoString(acctTmp[i])
}
return resp, nil
}
func splitServer(serverURL string) (*C.struct_Server, error) {
u, err := parseURL(serverURL)
if err != nil {
return nil, err
}
proto := C.kSecProtocolTypeHTTPS
if u.Scheme == "http" {
proto = C.kSecProtocolTypeHTTP
}
var port int
p := getPort(u)
if p != "" {
port, err = strconv.Atoi(p)
if err != nil {
return nil, err
}
}
return &C.struct_Server{
proto: C.SecProtocolType(proto),
host: C.CString(getHostname(u)),
port: C.uint(port),
path: C.CString(u.Path),
}, nil
}
func freeServer(s *C.struct_Server) {
C.free(unsafe.Pointer(s.host))
C.free(unsafe.Pointer(s.path))
}
// parseURL parses and validates a given serverURL to an url.URL, and
// returns an error if validation failed. Querystring parameters are
// omitted in the resulting URL, because they are not used in the helper.
//
// If serverURL does not have a valid scheme, `//` is used as scheme
// before parsing. This prevents the hostname being used as path,
// and the credentials being stored without host.
func parseURL(serverURL string) (*url.URL, error) {
// Check if serverURL has a scheme, otherwise add `//` as scheme.
if !strings.Contains(serverURL, "://") && !strings.HasPrefix(serverURL, "//") {
serverURL = "//" + serverURL
}
u, err := url.Parse(serverURL)
if err != nil {
return nil, err
}
if u.Scheme != "" && u.Scheme != "https" && u.Scheme != "http" {
return nil, errors.New("unsupported scheme: " + u.Scheme)
}
if getHostname(u) == "" {
return nil, errors.New("no hostname in URL")
}
u.RawQuery = ""
return u, nil
}
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