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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build darwin linux freebsd
package piv
// https://ludovicrousseau.blogspot.com/2010/04/pcsc-sample-in-c.html
// #cgo darwin LDFLAGS: -framework PCSC
// #cgo linux pkg-config: libpcsclite
// #cgo freebsd CFLAGS: -I/usr/local/include/
// #cgo freebsd CFLAGS: -I/usr/local/include/PCSC
// #cgo freebsd LDFLAGS: -L/usr/local/lib/
// #cgo freebsd LDFLAGS: -lpcsclite
// #include <PCSC/winscard.h>
// #include <PCSC/wintypes.h>
import "C"
import (
"bytes"
"fmt"
"unsafe"
)
const rcSuccess = C.SCARD_S_SUCCESS
type scContext struct {
ctx C.SCARDCONTEXT
}
func newSCContext() (*scContext, error) {
var ctx C.SCARDCONTEXT
rc := C.SCardEstablishContext(C.SCARD_SCOPE_SYSTEM, nil, nil, &ctx)
if err := scCheck(rc); err != nil {
return nil, err
}
return &scContext{ctx: ctx}, nil
}
func (c *scContext) Close() error {
return scCheck(C.SCardReleaseContext(c.ctx))
}
func (c *scContext) ListReaders() ([]string, error) {
var n C.DWORD
rc := C.SCardListReaders(c.ctx, nil, nil, &n)
// On Linux, the PC/SC daemon will return an error when no smart cards are
// available. Detect this and return nil with no smart cards instead.
//
// isRCNoReaders is defined in OS specific packages.
if isRCNoReaders(rc) {
return nil, nil
}
if err := scCheck(rc); err != nil {
return nil, err
}
d := make([]byte, n)
rc = C.SCardListReaders(c.ctx, nil, (*C.char)(unsafe.Pointer(&d[0])), &n)
if err := scCheck(rc); err != nil {
return nil, err
}
var readers []string
for _, d := range bytes.Split(d, []byte{0}) {
if len(d) > 0 {
readers = append(readers, string(d))
}
}
return readers, nil
}
type scHandle struct {
h C.SCARDHANDLE
}
func (c *scContext) Connect(reader string) (*scHandle, error) {
var (
handle C.SCARDHANDLE
activeProtocol C.DWORD
)
rc := C.SCardConnect(c.ctx, C.CString(reader),
C.SCARD_SHARE_EXCLUSIVE, C.SCARD_PROTOCOL_T1,
&handle, &activeProtocol)
if err := scCheck(rc); err != nil {
return nil, err
}
return &scHandle{handle}, nil
}
func (h *scHandle) Close() error {
return scCheck(C.SCardDisconnect(h.h, C.SCARD_LEAVE_CARD))
}
type scTx struct {
h C.SCARDHANDLE
}
func (h *scHandle) Begin() (*scTx, error) {
if err := scCheck(C.SCardBeginTransaction(h.h)); err != nil {
return nil, err
}
return &scTx{h.h}, nil
}
func (t *scTx) Close() error {
return scCheck(C.SCardEndTransaction(t.h, C.SCARD_LEAVE_CARD))
}
func (t *scTx) transmit(req []byte) (more bool, b []byte, err error) {
var resp [C.MAX_BUFFER_SIZE_EXTENDED]byte
reqN := C.DWORD(len(req))
respN := C.DWORD(len(resp))
rc := C.SCardTransmit(
t.h,
C.SCARD_PCI_T1,
(*C.BYTE)(&req[0]), reqN, nil,
(*C.BYTE)(&resp[0]), &respN)
if err := scCheck(rc); err != nil {
return false, nil, fmt.Errorf("transmitting request: %w", err)
}
if respN < 2 {
return false, nil, fmt.Errorf("scard response too short: %d", respN)
}
sw1 := resp[respN-2]
sw2 := resp[respN-1]
if sw1 == 0x90 && sw2 == 0x00 {
return false, resp[:respN-2], nil
}
if sw1 == 0x61 {
return true, resp[:respN-2], nil
}
return false, nil, &apduErr{sw1, sw2}
}
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