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300 lines
7.4 KiB
C
300 lines
7.4 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 "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 30 /* Number of seconds to wait for
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insertion of the card. */
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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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/* 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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sleep (1); /* FIXME: we should use a more reliable timer. */
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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 habe 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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#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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