security-and-privacy/gnupg
security-and-privacy/gnupg
1
0
Fork 0
mirror of git://git.gnupg.org/gnupg.git synced 2024-12-22 10:19:57 +01:00
Code Activity

Make soem omnikey readers work with extended length APDUs.

Browse Source
This commit is contained in:
Werner Koch 2009-06-29 20:54:00 +00:00
parent 011217c9bc
commit 9c47553308
3 changed files with 152 additions and 58 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
doc/DETAILS
View File

@ -1140,8 +1140,13 @@ Other Notes
to keep them small.
OIDs below the GnuPG arc:
=========================
1.3.6.1.4.1.11591.2 GnuPG
1.3.6.1.4.1.11591.2.1 notation
1.3.6.1.4.1.11591.2.1.1 pkaAddress
1.3.6.1.4.1.11591.2.12242973 invalid encoded OID

7
scd/ChangeLog
View File

@ -1,3 +1,10 @@
2009-06-29 Werner Koch <wk@g10code.com>
* ccid-driver.c (ccid_transceive): Add a hack to support extended
length for Omnikey readers.
(is_exlen_apdu): New.
(parse_ccid_descriptor): Track short+extended apdu exchange level.
2009-06-18 Werner Koch <wk@g10code.com>
* app-openpgp.c (verify_chv2): Remove special case for v2 cards.

196
scd/ccid-driver.c
View File

@ -1,6 +1,6 @@
/* ccid-driver.c - USB ChipCardInterfaceDevices driver
* Copyright (C) 2003, 2004, 2005, 2006, 2007
* 2008 Free Software Foundation, Inc.
* 2008, 2009 Free Software Foundation, Inc.
* Written by Werner Koch.
*
* This file is part of GnuPG.
@ -251,7 +251,9 @@ struct ccid_driver_s
int ifsc;
int powered_off;
int has_pinpad;
int apdu_level; /* Reader supports short APDU level exchange. */
int apdu_level; /* Reader supports short APDU level exchange.
With a value of 2 short and extended level is
supported.*/
};
@ -822,7 +824,7 @@ parse_ccid_descriptor (ccid_driver_t handle,
else if ((us & 0x00040000))
{
DEBUGOUT (" Short and extended APDU level exchange\n");
handle->apdu_level = 1;
handle->apdu_level = 2;
}
else if ((us & 0x00070000))
DEBUGOUT (" WARNING: conflicting exchange levels\n");
@ -2446,6 +2448,16 @@ compute_edc (const unsigned char *data, size_t datalen, int use_crc)
}
/* Return true if APDU is an extended length one. */
static int
is_exlen_apdu (const unsigned char *apdu, size_t apdulen)
{
if (apdulen < 7 || apdu[4])
return 0; /* Too short or no Z byte. */
return 1;
}
/* Helper for ccid_transceive used for APDU level exchanges. */
static int
ccid_transceive_apdu_level (ccid_driver_t handle,
@ -2574,7 +2586,9 @@ ccid_transceive (ccid_driver_t handle,
unsigned char *resp, size_t maxresplen, size_t *nresp)
{
int rc;
unsigned char send_buffer[10+259], recv_buffer[10+259];
/* The size of the buffer used to be 10+259. For the via_escape
hack we need one extra byte, thus 11+259. */
unsigned char send_buffer[11+259], recv_buffer[11+259];
const unsigned char *apdu;
size_t apdulen;
unsigned char *msg, *tpdu, *p;
@ -2582,10 +2596,14 @@ ccid_transceive (ccid_driver_t handle,
unsigned char seqno;
unsigned int edc;
int use_crc = 0;
int hdrlen, pcboff;
size_t dummy_nresp;
int via_escape = 0;
int next_chunk = 1;
int sending = 1;
int retries = 0;
int resyncing = 0;
int nad_byte;
if (!nresp)
nresp = &dummy_nresp;
@ -2593,13 +2611,32 @@ ccid_transceive (ccid_driver_t handle,
/* Smarter readers allow to send APDUs directly; divert here. */
if (handle->apdu_level)
return ccid_transceive_apdu_level (handle, apdu_buf, apdu_buflen,
resp, maxresplen, nresp);
{
/* We employ a hack for Omnikey readers which are able to send
TPDUs using an escape sequence. There is no documentation
but the Windows driver does it this way. Tested using a
CM6121. */
if ((handle->id_vendor == VENDOR_OMNIKEY
|| (!handle->idev && handle->id_product == TRANSPORT_CM4040))
&& handle->apdu_level < 2
&& is_exlen_apdu (apdu_buf, apdu_buflen))
via_escape = 1;
else
return ccid_transceive_apdu_level (handle, apdu_buf, apdu_buflen,
resp, maxresplen, nresp);
}
/* The other readers we support require sending TPDUs. */
tpdulen = 0; /* Avoid compiler warning about no initialization. */
msg = send_buffer;
hdrlen = via_escape? 11 : 10;
/* NAD: DAD=1, SAD=0 */
nad_byte = handle->nonnull_nad? ((1 << 4) | 0): 0;
if (via_escape)
nad_byte = 0;
for (;;)
{
if (next_chunk)
@ -2611,9 +2648,8 @@ ccid_transceive (ccid_driver_t handle,
assert (apdulen);
/* Construct an I-Block. */
tpdu = msg+10;
/* NAD: DAD=1, SAD=0 */
tpdu[0] = handle->nonnull_nad? ((1 << 4) | 0): 0;
tpdu = msg + hdrlen;
tpdu[0] = nad_byte;
tpdu[1] = ((handle->t1_ns & 1) << 6); /* I-block */
if (apdulen > handle->ifsc )
{
@ -2631,37 +2667,56 @@ ccid_transceive (ccid_driver_t handle,
tpdu[tpdulen++] = edc;
}
msg[0] = PC_to_RDR_XfrBlock;
msg[5] = 0; /* slot */
msg[6] = seqno = handle->seqno++;
msg[7] = 4; /* bBWI */
msg[8] = 0; /* RFU */
msg[9] = 0; /* RFU */
set_msg_len (msg, tpdulen);
msglen = 10 + tpdulen;
last_tpdulen = tpdulen;
if (via_escape)
{
msg[0] = PC_to_RDR_Escape;
msg[5] = 0; /* slot */
msg[6] = seqno = handle->seqno++;
msg[7] = 0; /* RFU */
msg[8] = 0; /* RFU */
msg[9] = 0; /* RFU */
msg[10] = 0x1a; /* Omnikey command to send a TPDU. */
set_msg_len (msg, 1 + tpdulen);
}
else
{
msg[0] = PC_to_RDR_XfrBlock;
msg[5] = 0; /* slot */
msg[6] = seqno = handle->seqno++;
msg[7] = 4; /* bBWI */
msg[8] = 0; /* RFU */
msg[9] = 0; /* RFU */
set_msg_len (msg, tpdulen);
}
msglen = hdrlen + tpdulen;
if (!resyncing)
last_tpdulen = tpdulen;
pcboff = hdrlen+1;
if (debug_level > 1)
DEBUGOUT_3 ("T=1: put %c-block seq=%d%s\n",
((msg[11] & 0xc0) == 0x80)? 'R' :
(msg[11] & 0x80)? 'S' : 'I',
((msg[11] & 0x80)? !!(msg[11]& 0x10)
: !!(msg[11] & 0x40)),
(!(msg[11] & 0x80) && (msg[11] & 0x20)? " [more]":""));
DEBUGOUT_3 ("T=1: put %c-block seq=%d%s\n",
((msg[pcboff] & 0xc0) == 0x80)? 'R' :
(msg[pcboff] & 0x80)? 'S' : 'I',
((msg[pcboff] & 0x80)? !!(msg[pcboff]& 0x10)
: !!(msg[pcboff] & 0x40)),
(!(msg[pcboff] & 0x80) && (msg[pcboff] & 0x20)?
" [more]":""));
rc = bulk_out (handle, msg, msglen, 0);
if (rc)
return rc;
msg = recv_buffer;
rc = bulk_in (handle, msg, sizeof recv_buffer, &msglen,
RDR_to_PC_DataBlock, seqno, 5000, 0);
via_escape? RDR_to_PC_Escape : RDR_to_PC_DataBlock,
seqno, 5000, 0);
if (rc)
return rc;
tpdu = msg + 10;
tpdulen = msglen - 10;
tpdu = msg + hdrlen;
tpdulen = msglen - hdrlen;
resyncing = 0;
if (tpdulen < 4)
{
usb_clear_halt (handle->idev, handle->ep_bulk_in);
@ -2670,11 +2725,13 @@ ccid_transceive (ccid_driver_t handle,
if (debug_level > 1)
DEBUGOUT_4 ("T=1: got %c-block seq=%d err=%d%s\n",
((msg[11] & 0xc0) == 0x80)? 'R' :
(msg[11] & 0x80)? 'S' : 'I',
((msg[11] & 0x80)? !!(msg[11]& 0x10) : !!(msg[11] & 0x40)),
((msg[11] & 0xc0) == 0x80)? (msg[11] & 0x0f) : 0,
(!(msg[11] & 0x80) && (msg[11] & 0x20)? " [more]":""));
((msg[pcboff] & 0xc0) == 0x80)? 'R' :
(msg[pcboff] & 0x80)? 'S' : 'I',
((msg[pcboff] & 0x80)? !!(msg[pcboff]& 0x10)
: !!(msg[pcboff] & 0x40)),
((msg[pcboff] & 0xc0) == 0x80)? (msg[pcboff] & 0x0f) : 0,
(!(msg[pcboff] & 0x80) && (msg[pcboff] & 0x20)?
" [more]":""));
if (!(tpdu[1] & 0x80))
{ /* This is an I-block. */
@ -2688,9 +2745,8 @@ ccid_transceive (ccid_driver_t handle,
if (!!(tpdu[1] & 0x40) != handle->t1_nr)
{ /* Reponse does not match our sequence number. */
msg = send_buffer;
tpdu = msg+10;
/* NAD: DAD=1, SAD=0 */
tpdu[0] = handle->nonnull_nad? ((1 << 4) | 0): 0;
tpdu = msg + hdrlen;
tpdu[0] = nad_byte;
tpdu[1] = (0x80 | (handle->t1_nr & 1) << 4 | 2); /* R-block */
tpdu[2] = 0;
tpdulen = 3;
@ -2727,9 +2783,8 @@ ccid_transceive (ccid_driver_t handle,
return 0; /* No chaining requested - ready. */
msg = send_buffer;
tpdu = msg+10;
/* NAD: DAD=1, SAD=0 */
tpdu[0] = handle->nonnull_nad? ((1 << 4) | 0): 0;
tpdu = msg + hdrlen;
tpdu[0] = nad_byte;
tpdu[1] = (0x80 | (handle->t1_nr & 1) << 4); /* R-block */
tpdu[2] = 0;
tpdulen = 3;
@ -2741,14 +2796,36 @@ ccid_transceive (ccid_driver_t handle,
else if ((tpdu[1] & 0xc0) == 0x80)
{ /* This is a R-block. */
if ( (tpdu[1] & 0x0f))
{ /* Error: repeat last block */
if (++retries > 3)
{
retries++;
if (via_escape && retries == 1 && (msg[pcboff] & 0x0f))
{
DEBUGOUT ("3 failed retries\n");
/* Error probably due to switching to TPDU. Send a
resync request. We use the recv_buffer so that
we don't corrupt the send_buffer. */
msg = recv_buffer;
tpdu = msg + hdrlen;
tpdu[0] = nad_byte;
tpdu[1] = 0xc0; /* S-block resync request. */
tpdu[2] = 0;
tpdulen = 3;
edc = compute_edc (tpdu, tpdulen, use_crc);
if (use_crc)
tpdu[tpdulen++] = (edc >> 8);
tpdu[tpdulen++] = edc;
DEBUGOUT ("T=1: requesting re-sync\n");
}
else if (retries > 3)
{
DEBUGOUT ("T=1: 3 failed retries\n");
return CCID_DRIVER_ERR_CARD_IO_ERROR;
}
msg = send_buffer;
tpdulen = last_tpdulen;
else
{
/* Error: repeat last block */
msg = send_buffer;
tpdulen = last_tpdulen;
}
}
else if (sending && !!(tpdu[1] & 0x10) == handle->t1_ns)
{ /* Response does not match our sequence number. */
@ -2771,7 +2848,7 @@ ccid_transceive (ccid_driver_t handle,
else
{ /* This is a S-block. */
retries = 0;
DEBUGOUT_2 ("T=1 S-block %s received cmd=%d\n",
DEBUGOUT_2 ("T=1: S-block %s received cmd=%d\n",
(tpdu[1] & 0x20)? "response": "request",
(tpdu[1] & 0x1f));
if ( !(tpdu[1] & 0x20) && (tpdu[1] & 0x1f) == 1 && tpdu[2] == 1)
@ -2783,9 +2860,8 @@ ccid_transceive (ccid_driver_t handle,
return CCID_DRIVER_ERR_CARD_IO_ERROR;
msg = send_buffer;
tpdu = msg+10;
/* NAD: DAD=1, SAD=0 */
tpdu[0] = handle->nonnull_nad? ((1 << 4) | 0): 0;
tpdu = msg + hdrlen;
tpdu[0] = nad_byte;
tpdu[1] = (0xc0 | 0x20 | 1); /* S-block response */
tpdu[2] = 1;
tpdu[3] = ifsc;
@ -2794,16 +2870,15 @@ ccid_transceive (ccid_driver_t handle,
if (use_crc)
tpdu[tpdulen++] = (edc >> 8);
tpdu[tpdulen++] = edc;
DEBUGOUT_1 ("T=1 requesting an ifsc=%d\n", ifsc);
DEBUGOUT_1 ("T=1: requesting an ifsc=%d\n", ifsc);
}
else if ( !(tpdu[1] & 0x20) && (tpdu[1] & 0x1f) == 3 && tpdu[2])
{
/* Wait time extension request. */
unsigned char bwi = tpdu[3];
msg = send_buffer;
tpdu = msg+10;
/* NAD: DAD=1, SAD=0 */
tpdu[0] = handle->nonnull_nad? ((1 << 4) | 0): 0;
tpdu = msg + hdrlen;
tpdu[0] = nad_byte;
tpdu[1] = (0xc0 | 0x20 | 3); /* S-block response */
tpdu[2] = 1;
tpdu[3] = bwi;
@ -2812,7 +2887,14 @@ ccid_transceive (ccid_driver_t handle,
if (use_crc)
tpdu[tpdulen++] = (edc >> 8);
tpdu[tpdulen++] = edc;
DEBUGOUT_1 ("T=1 waittime extension of bwi=%d\n", bwi);
DEBUGOUT_1 ("T=1: waittime extension of bwi=%d\n", bwi);
}
else if ( (tpdu[1] & 0x20) && (tpdu[1] & 0x1f) == 0 && !tpdu[2])
{
DEBUGOUT ("T=1: resync ack from reader\n");
/* Repeat previous block. */
msg = send_buffer;
tpdulen = last_tpdulen;
}
else
return CCID_DRIVER_ERR_CARD_IO_ERROR;
@ -3070,8 +3152,8 @@ ccid_transceive_secure (ccid_driver_t handle,
}
}
else
{ /* This is a S-block. */
DEBUGOUT_2 ("T=1 S-block %s received cmd=%d for Secure operation\n",
{ /* This is a S-bl<ock. */
DEBUGOUT_2 ("T=1: S-block %s received cmd=%d for Secure operation\n",
(tpdu[1] & 0x20)? "response": "request",
(tpdu[1] & 0x1f));
return CCID_DRIVER_ERR_CARD_IO_ERROR;