mirror of git://git.gnupg.org/gnupg.git
559 lines
16 KiB
C
559 lines
16 KiB
C
/* apdu.c - ISO 7816 APDU functions and low level I/O
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* Copyright (C) 2003 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <dlfcn.h>
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#include <assert.h>
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#include "scdaemon.h"
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#include "apdu.h"
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#define HAVE_CTAPI 1
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#define MAX_READER 4 /* Number of readers we support concurrently. */
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#define CARD_CONNECT_TIMEOUT 1 /* Number of seconds to wait for
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insertion of the card (1 = don't wait). */
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/* A global table to keep track of active readers. */
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static struct {
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int used; /* True if slot is used. */
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unsigned short port; /* port number0 = unused, 1 - dev/tty */
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int status;
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unsigned char atr[33];
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size_t atrlen;
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} reader_table[MAX_READER];
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/* ct API function pointer. */
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static char (*CT_init) (unsigned short ctn, unsigned short Pn);
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static char (*CT_data) (unsigned short ctn, unsigned char *dad,
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unsigned char *sad, unsigned short lc,
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unsigned char *cmd, unsigned short *lr,
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unsigned char *rsp);
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static char (*CT_close) (unsigned short ctn);
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/*
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Helper
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*/
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/* Find an unused reader slot for PORT and put it into the reader
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table. Return -1 on error or the index into the reader table. */
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static int
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new_reader_slot (int port)
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{
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int i, reader = -1;
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if (port < 0 || port > 0xffff)
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{
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log_error ("new_reader_slot: invalid port %d requested\n", port);
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return -1;
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}
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for (i=0; i < MAX_READER; i++)
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{
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if (reader_table[i].used && reader_table[i].port == port)
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{
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log_error ("new_reader_slot: requested port %d already in use\n",
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reader);
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return -1;
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}
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else if (!reader_table[i].used && reader == -1)
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reader = i;
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}
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if (reader == -1)
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{
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log_error ("new_reader_slot: out of slots\n");
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return -1;
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}
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reader_table[reader].used = 1;
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reader_table[reader].port = port;
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return reader;
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}
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static void
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dump_reader_status (int reader)
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{
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log_info ("reader %d: %s\n", reader,
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reader_table[reader].status == 1? "Processor ICC present" :
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reader_table[reader].status == 0? "Memory ICC present" :
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"ICC not present" );
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if (reader_table[reader].status != -1)
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{
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log_info ("reader %d: ATR=", reader);
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log_printhex ("", reader_table[reader].atr,
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reader_table[reader].atrlen);
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}
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}
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#ifdef HAVE_CTAPI
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/*
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ct API Interface
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*/
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static const char *
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ct_error_string (int err)
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{
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switch (err)
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{
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case 0: return "okay";
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case -1: return "invalid data";
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case -8: return "ct error";
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case -10: return "transmission error";
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case -11: return "memory allocation error";
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case -128: return "HTSI error";
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default: return "unknown CT-API error";
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}
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}
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/* Wait for the card in READER and activate it. Return -1 on error or
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0 on success. */
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static int
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ct_activate_card (int reader)
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{
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int rc, count;
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for (count = 0; count < CARD_CONNECT_TIMEOUT; count++)
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{
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unsigned char dad[1], sad[1], cmd[11], buf[256];
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unsigned short buflen;
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if (count)
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sleep (1); /* FIXME: we should use a more reliable timer. */
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/* Check whether card has been inserted. */
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dad[0] = 1; /* Destination address: CT. */
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sad[0] = 2; /* Source address: Host. */
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cmd[0] = 0x20; /* Class byte. */
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cmd[1] = 0x13; /* Request status. */
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cmd[2] = 0x00; /* From kernel. */
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cmd[3] = 0x80; /* Return card's DO. */
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cmd[4] = 0x00;
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buflen = DIM(buf);
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rc = CT_data (reader, dad, sad, 5, cmd, &buflen, buf);
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if (rc || buflen < 2 || buf[buflen-2] != 0x90)
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{
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log_error ("ct_activate_card: can't get status of reader %d: %s\n",
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reader, ct_error_string (rc));
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return -1;
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}
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if (buf[0] == 0x05)
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{ /* Connected, now activate the card. */
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dad[0] = 1; /* Destination address: CT. */
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sad[0] = 2; /* Source address: Host. */
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cmd[0] = 0x20; /* Class byte. */
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cmd[1] = 0x12; /* Request ICC. */
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cmd[2] = 0x01; /* From first interface. */
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cmd[3] = 0x01; /* Return card's ATR. */
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cmd[4] = 0x00;
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buflen = DIM(buf);
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rc = CT_data (reader, dad, sad, 5, cmd, &buflen, buf);
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if (rc || buflen < 2 || buf[buflen-2] != 0x90)
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{
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log_error ("ct_activate_card(%d): activation failed: %s\n",
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reader, ct_error_string (rc));
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return -1;
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}
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/* Store the type and the ATR. */
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if (buflen - 2 > DIM (reader_table[0].atr))
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{
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log_error ("ct_activate_card(%d): ATR too long\n", reader);
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return -1;
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}
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reader_table[reader].status = buf[buflen - 1];
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memcpy (reader_table[reader].atr, buf, buflen - 2);
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reader_table[reader].atrlen = buflen - 2;
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return 0;
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}
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}
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log_info ("ct_activate_card(%d): timeout waiting for card\n", reader);
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return -1;
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}
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/* Open a reader and return an internal handle for it. PORT is a
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non-negative value with the port number of the reader. USB readers
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do have port numbers starting at 32769. */
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static int
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open_ct_reader (int port)
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{
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int rc, reader;
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reader = new_reader_slot (port);
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if (reader == -1)
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return reader;
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rc = CT_init (reader, (unsigned short)port);
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if (rc)
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{
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log_error ("apdu_open_ct_reader failed on port %d: %s\n",
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port, ct_error_string (rc));
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reader_table[reader].used = 0;
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return -1;
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}
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rc = ct_activate_card (reader);
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if (rc)
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{
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reader_table[reader].used = 0;
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return -1;
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}
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dump_reader_status (reader);
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return reader;
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}
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/* Actually send the APDU of length APDULEN to SLOT and return a
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maximum of *BUFLEN data in BUFFER, the actual retruned size will be
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set to BUFLEN. Returns: CT API error code. */
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static int
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ct_send_apdu (int slot, unsigned char *apdu, size_t apdulen,
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unsigned char *buffer, size_t *buflen)
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{
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int rc;
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unsigned char dad[1], sad[1];
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unsigned short ctbuflen;
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dad[0] = 0; /* Destination address: Card. */
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sad[0] = 2; /* Source address: Host. */
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ctbuflen = *buflen;
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if (DBG_CARD_IO)
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log_printhex (" CT_data:", apdu, apdulen);
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rc = CT_data (slot, dad, sad, apdulen, apdu, &ctbuflen, buffer);
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*buflen = ctbuflen;
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/* FIXME: map the errorcodes to GNUPG ones, so that they can be
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shared between CTAPI and PCSC. */
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return rc;
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}
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#endif /*HAVE_CTAPI*/
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#ifdef HAVE_PCSC
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/*
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PC/SC Interface
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*/
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#endif /*HAVE_PCSC*/
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/*
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Driver Access
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*/
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/* Open the reader and return an internal slot number or -1 on
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error. */
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int
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apdu_open_reader (int port)
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{
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static int ct_api_loaded;
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if (!ct_api_loaded)
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{
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void *handle;
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handle = dlopen ("libtowitoko.so", RTLD_LAZY);
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if (!handle)
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{
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log_error ("apdu_open_reader: failed to open driver: %s",
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dlerror ());
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return -1;
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}
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CT_init = dlsym (handle, "CT_init");
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CT_data = dlsym (handle, "CT_data");
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CT_close = dlsym (handle, "CT_close");
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if (!CT_init || !CT_data || !CT_close)
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{
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log_error ("apdu_open_reader: invalid driver\n");
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dlclose (handle);
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return -1;
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}
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ct_api_loaded = 1;
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}
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return open_ct_reader (port);
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}
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unsigned char *
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apdu_get_atr (int slot, size_t *atrlen)
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{
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char *buf;
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if (slot < 0 || slot >= MAX_READER || !reader_table[slot].used )
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return NULL;
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buf = xtrymalloc (reader_table[slot].atrlen);
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if (!buf)
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return NULL;
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memcpy (buf, reader_table[slot].atr, reader_table[slot].atrlen);
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*atrlen = reader_table[slot].atrlen;
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return buf;
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}
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static const char *
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error_string (int slot, int rc)
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{
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#ifdef HAVE_CTAPI
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return ct_error_string (rc);
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#elif defined(HAVE_PCSC)
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return "?";
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#else
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return "?";
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#endif
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}
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/* Dispatcher for the actual send_apdu fucntion. */
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static int
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send_apdu (int slot, unsigned char *apdu, size_t apdulen,
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unsigned char *buffer, size_t *buflen)
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{
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#ifdef HAVE_CTAPI
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return ct_send_apdu (slot, apdu, apdulen, buffer, buflen);
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#elif defined(HAVE_PCSC)
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return SW_HOST_NO_DRIVER;
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#else
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return SW_HOST_NO_DRIVER;
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#endif
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}
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/* Send an APDU to the card in SLOT. The APDU is created from all
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given parameters: CLASS, INS, P0, P1, LC, DATA, LE. A value of -1
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for LC won't sent this field and the data field; in this case DATA
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must also be passed as NULL. The return value is the status word
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or -1 for an invalid SLOT or other non card related error. If
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RETBUF is not NULL, it will receive an allocated buffer with the
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returned data. The length of that data will be put into
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*RETBUFLEN. The caller is reponsible for releasing the buffer even
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in case of errors. */
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int
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apdu_send_le(int slot, int class, int ins, int p0, int p1,
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int lc, const char *data, int le,
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unsigned char **retbuf, size_t *retbuflen)
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{
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unsigned char result[256+10]; /* 10 extra in case of bugs in the driver. */
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size_t resultlen = 256;
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unsigned char apdu[5+256+1];
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size_t apdulen;
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int rc, sw;
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if (DBG_CARD_IO)
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log_debug ("send apdu: c=%02X i=%02X p0=%02X p1=%02X lc=%d le=%d\n",
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class, ins, p0, p1, lc, le);
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if (lc != -1 && (lc > 255 || lc < 0))
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return SW_WRONG_LENGTH;
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if (le != -1 && (le > 256 || le < 1))
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return SW_WRONG_LENGTH;
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if ((!data && lc != -1) || (data && lc == -1))
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return SW_HOST_INV_VALUE;
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apdulen = 0;
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apdu[apdulen++] = class;
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apdu[apdulen++] = ins;
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apdu[apdulen++] = p0;
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apdu[apdulen++] = p1;
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if (lc != -1)
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{
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apdu[apdulen++] = lc;
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memcpy (apdu+apdulen, data, lc);
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apdulen += lc;
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}
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if (le != -1)
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apdu[apdulen++] = le; /* Truncation is okay becuase 0 means 256. */
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assert (sizeof (apdu) >= apdulen);
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/* As safeguard don't pass any garbage from the stack to the driver. */
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memset (apdu+apdulen, 0, sizeof (apdu) - apdulen);
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rc = send_apdu (slot, apdu, apdulen, result, &resultlen);
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if (rc || resultlen < 2)
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{
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log_error ("apdu_send_simple(%d) failed: %s\n",
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slot, error_string (slot, rc));
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return SW_HOST_INCOMPLETE_CARD_RESPONSE;
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}
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sw = (result[resultlen-2] << 8) | result[resultlen-1];
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/* store away the returned data but strip the statusword. */
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resultlen -= 2;
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if (DBG_CARD_IO)
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{
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log_debug (" response: sw=%04X datalen=%d\n", sw, resultlen);
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if ( !retbuf && (sw == SW_SUCCESS || (sw & 0xff00) == SW_MORE_DATA))
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log_printhex (" dump: ", result, resultlen);
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}
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if (sw == SW_SUCCESS)
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{
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if (retbuf)
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{
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*retbuf = xtrymalloc (resultlen? resultlen : 1);
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if (!*retbuf)
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return SW_HOST_OUT_OF_CORE;
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*retbuflen = resultlen;
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memcpy (*retbuf, result, resultlen);
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}
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}
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else if ((sw & 0xff00) == SW_MORE_DATA)
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{
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unsigned char *p = NULL, *tmp;
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size_t bufsize = 4096;
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/* It is likely that we need to return much more data, so we
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start off with a large buffer. */
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if (retbuf)
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{
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*retbuf = p = xtrymalloc (bufsize);
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if (!*retbuf)
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return SW_HOST_OUT_OF_CORE;
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assert (resultlen < bufsize);
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memcpy (p, result, resultlen);
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p += resultlen;
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}
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do
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{
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int len = (sw & 0x00ff);
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log_debug ("apdu_send_simple(%d): %d more bytes available\n",
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slot, len);
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apdulen = 0;
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apdu[apdulen++] = class;
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apdu[apdulen++] = 0xC0;
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apdu[apdulen++] = 0;
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apdu[apdulen++] = 0;
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apdu[apdulen++] = 64; /* that is 256 bytes for Le */
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memset (apdu+apdulen, 0, sizeof (apdu) - apdulen);
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rc = send_apdu (slot, apdu, apdulen, result, &resultlen);
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if (rc || resultlen < 2)
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{
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log_error ("apdu_send_simple(%d) for get response failed: %s\n",
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slot, error_string (slot, rc));
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return SW_HOST_INCOMPLETE_CARD_RESPONSE;
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}
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sw = (result[resultlen-2] << 8) | result[resultlen-1];
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resultlen -= 2;
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if (DBG_CARD_IO)
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{
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log_debug (" more: sw=%04X datalen=%d\n", sw, resultlen);
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if (!retbuf && (sw==SW_SUCCESS || (sw&0xff00)==SW_MORE_DATA))
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log_printhex (" dump: ", result, resultlen);
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}
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if ((sw & 0xff00) == SW_MORE_DATA || sw == SW_SUCCESS)
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{
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if (retbuf)
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{
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if (p - *retbuf + resultlen > bufsize)
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{
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bufsize += resultlen > 4096? resultlen: 4096;
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tmp = xtryrealloc (*retbuf, bufsize);
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if (!tmp)
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return SW_HOST_OUT_OF_CORE;
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p = tmp + (p - *retbuf);
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*retbuf = tmp;
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}
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memcpy (p, result, resultlen);
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p += resultlen;
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}
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}
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else
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log_info ("apdu_send_simple(%d) "
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"got unexpected status %04X from get response\n",
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slot, sw);
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}
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while ((sw & 0xff00) == SW_MORE_DATA);
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if (retbuf)
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{
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*retbuflen = p - *retbuf;
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tmp = xtryrealloc (*retbuf, *retbuflen);
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if (tmp)
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*retbuf = tmp;
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}
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}
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if (DBG_CARD_IO && retbuf && sw == SW_SUCCESS)
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log_printhex (" dump: ", *retbuf, *retbuflen);
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return sw;
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}
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/* Send an APDU to the card in SLOT. The APDU is created from all
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||
given parameters: CLASS, INS, P0, P1, LC, DATA. A value of -1 for
|
||
LC won't sent this field and the data field; in this case DATA must
|
||
also be passed as NULL. The return value is the status word or -1
|
||
for an invalid SLOT or other non card related error. If RETBUF is
|
||
not NULL, it will receive an allocated buffer with the returned
|
||
data. The length of that data will be put into *RETBUFLEN. The
|
||
caller is reponsible for releasing the buffer even in case of
|
||
errors. */
|
||
int
|
||
apdu_send (int slot, int class, int ins, int p0, int p1,
|
||
int lc, const char *data, unsigned char **retbuf, size_t *retbuflen)
|
||
{
|
||
return apdu_send_le (slot, class, ins, p0, p1, lc, data, 256,
|
||
retbuf, retbuflen);
|
||
}
|
||
|
||
/* Send an APDU to the card in SLOT. The APDU is created from all
|
||
given parameters: CLASS, INS, P0, P1, LC, DATA. A value of -1 for
|
||
LC won't sent this field and the data field; in this case DATA must
|
||
also be passed as NULL. The return value is the status word or -1
|
||
for an invalid SLOT or other non card related error. No data will be
|
||
returned. */
|
||
int
|
||
apdu_send_simple (int slot, int class, int ins, int p0, int p1,
|
||
int lc, const char *data)
|
||
{
|
||
return apdu_send_le (slot, class, ins, p0, p1, lc, data, -1, NULL, NULL);
|
||
}
|
||
|
||
|
||
|
||
|