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keychain.go
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keychain.go
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// +build darwin
package keyring
/*
#cgo CFLAGS: -mmacosx-version-min=10.6 -D__MAC_OS_X_VERSION_MAX_ALLOWED=1060
#cgo LDFLAGS: -framework CoreFoundation -framework Security
#include <stdlib.h>
#include <CoreFoundation/CoreFoundation.h>
#include <Security/Security.h>
*/
import "C"
import (
"errors"
"fmt"
"log"
"os"
"os/user"
"unicode/utf8"
"unsafe"
)
type OSXKeychain struct {
path string
password string
service string
}
func (k *OSXKeychain) Get(key string) ([]byte, error) {
if _, err := os.Stat(k.path); os.IsNotExist(err) {
return []byte{}, ErrKeyNotFound
}
kref, err := openKeychain(k.path)
if err != nil {
return nil, err
}
defer C.CFRelease(C.CFTypeRef(kref))
serviceRef := C.CString(k.service)
defer C.free(unsafe.Pointer(serviceRef))
accountRef := C.CString(key)
defer C.free(unsafe.Pointer(accountRef))
var passwordLength C.UInt32
var password unsafe.Pointer
errCode := C.SecKeychainFindGenericPassword(
C.CFTypeRef(kref),
C.UInt32(len(k.service)),
serviceRef,
C.UInt32(len(key)),
accountRef,
&passwordLength,
&password,
nil,
)
if err := newKeychainError(errCode); err != nil {
return nil, err
}
defer C.SecKeychainItemFreeContent(nil, password)
return C.GoBytes(password, C.int(passwordLength)), nil
}
func (k *OSXKeychain) Set(key string, secret []byte) error {
var kref C.SecKeychainRef
var err error
if _, err := os.Stat(k.path); os.IsNotExist(err) {
var prompt = true
if k.password != "" {
prompt = false
}
log.Printf("creating keychain %s (prompt %#v)", k.path, prompt)
kref, err = createKeychain(k.path, prompt, k.password)
if err != nil {
return err
}
defer C.CFRelease(C.CFTypeRef(kref))
} else {
log.Printf("opening keychain %s", k.path)
kref, err = openKeychain(k.path)
if err != nil {
return err
}
defer C.CFRelease(C.CFTypeRef(kref))
}
var serviceRef C.CFStringRef
if serviceRef, err = _UTF8StringToCFString(k.service); err != nil {
return err
}
defer C.CFRelease(C.CFTypeRef(serviceRef))
var accountRef C.CFStringRef
if accountRef, err = _UTF8StringToCFString(key); err != nil {
return err
}
defer C.CFRelease(C.CFTypeRef(accountRef))
var descr C.CFStringRef
if descr, err = _UTF8StringToCFString("aws-vault credentials"); err != nil {
return err
}
defer C.CFRelease(C.CFTypeRef(descr))
var label C.CFStringRef
if label, err = _UTF8StringToCFString(fmt.Sprintf("%s (%s)", k.service, key)); err != nil {
return err
}
defer C.CFRelease(C.CFTypeRef(label))
dataBytes := bytesToCFData(secret)
defer C.CFRelease(C.CFTypeRef(dataBytes))
access, err := createEmptyAccess(fmt.Sprintf("%s (%s)", k.service, key))
if err != nil {
return err
}
defer C.CFRelease(C.CFTypeRef(access))
query := map[C.CFTypeRef]C.CFTypeRef{
C.kSecClass: C.kSecClassGenericPassword,
C.kSecAttrService: C.CFTypeRef(serviceRef),
C.kSecAttrAccount: C.CFTypeRef(accountRef),
C.kSecValueData: C.CFTypeRef(dataBytes),
C.kSecAttrDescription: C.CFTypeRef(descr),
C.kSecAttrLabel: C.CFTypeRef(label),
C.kSecUseKeychain: C.CFTypeRef(kref),
C.kSecAttrAccess: C.CFTypeRef(access),
}
queryDict := mapToCFDictionary(query)
defer C.CFRelease(C.CFTypeRef(queryDict))
log.Printf("adding service=%q, account=%q to osx keychain %s", k.service, key, k.path)
err = newKeychainError(C.SecItemAdd(queryDict, nil))
if err == errDuplicateItem {
if err = k.Remove(key); err != nil {
return err
}
log.Printf("adding service=%q, account=%q to osx keychain %s", k.service, key, k.path)
err = newKeychainError(C.SecItemAdd(queryDict, nil))
}
return err
}
func (k *OSXKeychain) Remove(key string) error {
if _, err := os.Stat(k.path); os.IsNotExist(err) {
return ErrKeyNotFound
}
kref, err := openKeychain(k.path)
if err != nil {
return err
}
item, err := findGenericPasswordItem(kref, k.service, key)
if err != nil {
return err
}
defer C.CFRelease(C.CFTypeRef(item))
log.Printf("removing keychain item service=%q, account=%q from osx keychain %q", k.service, key, k.path)
return newKeychainError(C.SecKeychainItemDelete(item))
}
func (k *OSXKeychain) Keys() ([]string, error) {
serviceRef, err := _UTF8StringToCFString(k.service)
if err != nil {
return nil, err
}
defer C.CFRelease(C.CFTypeRef(serviceRef))
query := map[C.CFTypeRef]C.CFTypeRef{
C.kSecClass: C.kSecClassGenericPassword,
C.kSecAttrService: C.CFTypeRef(serviceRef),
C.kSecMatchLimit: C.kSecMatchLimitAll,
C.kSecReturnAttributes: C.CFTypeRef(C.kCFBooleanTrue),
}
kref, err := openKeychain(k.path)
if err != nil {
return nil, err
}
searchArray := arrayToCFArray([]C.CFTypeRef{C.CFTypeRef(kref)})
defer C.CFRelease(C.CFTypeRef(searchArray))
query[C.kSecMatchSearchList] = C.CFTypeRef(searchArray)
queryDict := mapToCFDictionary(query)
defer C.CFRelease(C.CFTypeRef(queryDict))
var resultsRef C.CFTypeRef
if err = newKeychainError(C.SecItemCopyMatching(queryDict, &resultsRef)); err == errItemNotFound {
return nil, nil
} else if err != nil {
return nil, err
}
defer C.CFRelease(resultsRef)
var accountNames = []string{}
for _, result := range _CFArrayToArray(C.CFArrayRef(resultsRef)) {
m := _CFDictionaryToMap(C.CFDictionaryRef(result))
accountName := _CFStringToUTF8String(C.CFStringRef(m[C.kSecAttrAccount]))
accountNames = append(accountNames, accountName)
}
return accountNames, nil
}
func init() {
keychainFile := os.Getenv("AWS_KEYCHAIN_FILE")
if keychainFile == "" {
usr, err := user.Current()
if err != nil {
panic(err)
}
keychainFile = usr.HomeDir + "/Library/Keychains/aws-vault.keychain"
}
keyring = &OSXKeychain{path: keychainFile, service: "aws-vault"}
}
// -------------------------------------------------
// OSX Keychain API funcs
// https://developer.apple.com/library/mac/documentation/Security/Reference/keychainservices/index.html
// The returned SecAccessRef, if non-nil, must be released via CFRelease.
func createEmptyAccess(label string) (C.SecAccessRef, error) {
var err error
var labelRef C.CFStringRef
if labelRef, err = _UTF8StringToCFString(label); err != nil {
return nil, err
}
defer C.CFRelease(C.CFTypeRef(labelRef))
var access C.SecAccessRef
trustedApplicationsArray := arrayToCFArray([]C.CFTypeRef{})
defer C.CFRelease(C.CFTypeRef(trustedApplicationsArray))
if err = newKeychainError(C.SecAccessCreate(labelRef, trustedApplicationsArray, &access)); err != nil {
return nil, err
}
return access, nil
}
// The returned SecKeychainRef, if non-nil, must be released via CFRelease.
func createKeychain(path string, promptUser bool, password string) (C.SecKeychainRef, error) {
pathName := C.CString(path)
defer C.free(unsafe.Pointer(pathName))
var kref C.SecKeychainRef
var errCode C.OSStatus
if promptUser {
errCode = C.SecKeychainCreate(pathName, C.UInt32(0), nil, C.Boolean(1), nil, &kref)
} else {
passwordRef := C.CString(password)
defer C.free(unsafe.Pointer(passwordRef))
errCode = C.SecKeychainCreate(pathName, C.UInt32(len(password)), unsafe.Pointer(passwordRef), C.Boolean(0), nil, &kref)
}
if err := newKeychainError(errCode); err != nil {
return nil, err
}
return kref, nil
}
// The returned SecKeychainRef, if non-nil, must be released via CFRelease.
func openKeychain(path string) (C.SecKeychainRef, error) {
log.Printf("opening keychain %s", path)
pathName := C.CString(path)
defer C.free(unsafe.Pointer(pathName))
var kref C.SecKeychainRef
if err := newKeychainError(C.SecKeychainOpen(pathName, &kref)); err != nil {
return nil, err
}
return kref, nil
}
// The returned SecKeychainItemRef, if non-nil, must be released via CFRelease.
func findGenericPasswordItem(kref C.SecKeychainRef, service, account string) (itemRef C.SecKeychainItemRef, err error) {
serviceRef := C.CString(service)
defer C.free(unsafe.Pointer(serviceRef))
accountRef := C.CString(account)
defer C.free(unsafe.Pointer(accountRef))
errCode := C.SecKeychainFindGenericPassword(
C.CFTypeRef(kref),
C.UInt32(len(service)),
serviceRef,
C.UInt32(len(account)),
accountRef,
nil,
nil,
&itemRef,
)
err = newKeychainError(errCode)
return
}
// -------------------------------------------------
// From go-osxkeychain
// https://github.com/keybase/go-osxkeychain/blob/master/osxkeychain.go
type keychainError C.OSStatus
const (
errUnimplemented keychainError = C.errSecUnimplemented
errParam keychainError = C.errSecParam
errAllocate keychainError = C.errSecAllocate
errNotAvailable keychainError = C.errSecNotAvailable
errReadOnly keychainError = C.errSecReadOnly
errAuthFailed keychainError = C.errSecAuthFailed
errNoSuchKeychain keychainError = C.errSecNoSuchKeychain
errInvalidKeychain keychainError = C.errSecInvalidKeychain
errDuplicateKeychain keychainError = C.errSecDuplicateKeychain
errDuplicateCallback keychainError = C.errSecDuplicateCallback
errInvalidCallback keychainError = C.errSecInvalidCallback
errDuplicateItem keychainError = C.errSecDuplicateItem
errItemNotFound keychainError = C.errSecItemNotFound
errBufferTooSmall keychainError = C.errSecBufferTooSmall
errDataTooLarge keychainError = C.errSecDataTooLarge
errNoSuchAttr keychainError = C.errSecNoSuchAttr
errInvalidItemRef keychainError = C.errSecInvalidItemRef
errInvalidSearchRef keychainError = C.errSecInvalidSearchRef
errNoSuchClass keychainError = C.errSecNoSuchClass
errNoDefaultKeychain keychainError = C.errSecNoDefaultKeychain
errReadOnlyAttr keychainError = C.errSecReadOnlyAttr
)
func newKeychainError(errCode C.OSStatus) error {
if errCode == C.noErr {
return nil
}
return keychainError(errCode)
}
func (ke keychainError) Error() string {
errorMessageCFString := C.SecCopyErrorMessageString(C.OSStatus(ke), nil)
defer C.CFRelease(C.CFTypeRef(errorMessageCFString))
errorMessageCString := C.CFStringGetCStringPtr(errorMessageCFString, C.kCFStringEncodingASCII)
if errorMessageCString != nil {
return C.GoString(errorMessageCString)
}
return fmt.Sprintf("keychainError with unknown error code %d", C.OSStatus(ke))
}
// The returned CFStringRef, if non-nil, must be released via CFRelease.
func _UTF8StringToCFString(s string) (C.CFStringRef, error) {
if !utf8.ValidString(s) {
return nil, errors.New("invalid UTF-8 string")
}
bytes := []byte(s)
var p *C.UInt8
if len(bytes) > 0 {
p = (*C.UInt8)(&bytes[0])
}
return C.CFStringCreateWithBytes(nil, p, C.CFIndex(len(s)), C.kCFStringEncodingUTF8, C.false), nil
}
func _CFStringToUTF8String(s C.CFStringRef) string {
p := C.CFStringGetCStringPtr(s, C.kCFStringEncodingUTF8)
if p != nil {
return C.GoString(p)
}
length := C.CFStringGetLength(s)
if length == 0 {
return ""
}
maxBufLen := C.CFStringGetMaximumSizeForEncoding(length, C.kCFStringEncodingUTF8)
if maxBufLen == 0 {
return ""
}
buf := make([]byte, maxBufLen)
var usedBufLen C.CFIndex
_ = C.CFStringGetBytes(s, C.CFRange{0, length}, C.kCFStringEncodingUTF8, C.UInt8(0), C.false, (*C.UInt8)(&buf[0]), maxBufLen, &usedBufLen)
return string(buf[:usedBufLen])
}
// The returned CFDictionaryRef, if non-nil, must be released via CFRelease.
func mapToCFDictionary(m map[C.CFTypeRef]C.CFTypeRef) C.CFDictionaryRef {
var keys, values []unsafe.Pointer
for key, value := range m {
keys = append(keys, unsafe.Pointer(key))
values = append(values, unsafe.Pointer(value))
}
numValues := len(values)
var keysPointer, valuesPointer *unsafe.Pointer
if numValues > 0 {
keysPointer = &keys[0]
valuesPointer = &values[0]
}
return C.CFDictionaryCreate(nil, keysPointer, valuesPointer, C.CFIndex(numValues), &C.kCFTypeDictionaryKeyCallBacks, &C.kCFTypeDictionaryValueCallBacks)
}
func _CFDictionaryToMap(cfDict C.CFDictionaryRef) (m map[C.CFTypeRef]C.CFTypeRef) {
count := C.CFDictionaryGetCount(cfDict)
if count > 0 {
keys := make([]C.CFTypeRef, count)
values := make([]C.CFTypeRef, count)
C.CFDictionaryGetKeysAndValues(cfDict, (*unsafe.Pointer)(&keys[0]), (*unsafe.Pointer)(&values[0]))
m = make(map[C.CFTypeRef]C.CFTypeRef, count)
for i := C.CFIndex(0); i < count; i++ {
m[keys[i]] = values[i]
}
}
return
}
// The returned CFArrayRef, if non-nil, must be released via CFRelease.
func arrayToCFArray(a []C.CFTypeRef) C.CFArrayRef {
var values []unsafe.Pointer
for _, value := range a {
values = append(values, unsafe.Pointer(value))
}
numValues := len(values)
var valuesPointer *unsafe.Pointer
if numValues > 0 {
valuesPointer = &values[0]
}
return C.CFArrayCreate(nil, valuesPointer, C.CFIndex(numValues), &C.kCFTypeArrayCallBacks)
}
func _CFArrayToArray(cfArray C.CFArrayRef) (a []C.CFTypeRef) {
count := C.CFArrayGetCount(cfArray)
if count > 0 {
a = make([]C.CFTypeRef, count)
C.CFArrayGetValues(cfArray, C.CFRange{0, count}, (*unsafe.Pointer)(&a[0]))
}
return
}
// The returned CFDataRef, if non-nil, must be released via CFRelease.
func bytesToCFData(b []byte) C.CFDataRef {
var p *C.UInt8
if len(b) > 0 {
p = (*C.UInt8)(&b[0])
}
return C.CFDataCreate(nil, p, C.CFIndex(len(b)))
}