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/* card-dinsig.c - German signature law (DINSIG) functions
* Copyright (C) 2002 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GnuPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
/* The German signature law and its bylaw (SigG and SigV) is currently
used with an interface specification described in DIN V 66291-1.
The AID to be used is: 'D27600006601'.
The file IDs for certificates utilize the generic format:
Cxyz
C being the hex digit 'C' (12).
x being the service indicator:
'0' := SigG conform digital signature.
'1' := entity authentication.
'2' := key encipherment.
'3' := data encipherment.
'4' := key agreement.
other values are reserved for future use.
y being the security environment number using '0' for cards
not supporting a SE number.
z being the certificate type:
'0' := C.CH (base certificate of ard holder) or C.ICC.
'1' .. '7' := C.CH (business or professional certificate
of card holder.
'8' .. 'D' := C.CA (certificate of a CA issue by the Root-CA).
'E' := C.RCA (self certified certificate of the Root-CA).
'F' := reserved.
The file IDs used by default are:
'1F00' EF.SSD (security service descriptor). [o,o]
'2F02' EF.GDO (global data objects) [m,m]
'A000' EF.PROT (signature log). Cyclic file with 20 records of 53 byte.
Read and update after user authentication. [o,o]
'B000' EF.PK.RCA.DS (public keys of Root-CA). Size is 512b or size
of keys. [m (unless a 'C00E' is present),m]
'B001' EF.PK.CA.DS (public keys of CAs). Size is 512b or size
of keys. [o,o]
'C00n' EF.C.CH.DS (digital signature certificate of card holder)
with n := 0 .. 7. Size is 2k or size of cert. Read and
update allowed after user authentication. [m,m]
'C00m' EF.C.CA.DS (digital signature certificate of CA)
with m := 8 .. E. Size is 1k or size of cert. Read always
allowed, update after uder authentication. [o,o]
'C100' EF.C.ICC.AUT (AUT certificate of ICC) [o,m]
'C108' EF.C.CA.AUT (AUT certificate of CA) [o,m]
'D000' EF.DM (display message) [-,m]
The letters in brackets indicate optional or mandatory files: The
first for card terminals under full control and the second for
"business" card terminals.
FIXME: Needs a lot more explanation.
*/
#include <config.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#ifdef HAVE_OPENSC
#include <opensc/pkcs15.h>
#include "scdaemon.h"
#include <ksba.h>
#include "card-common.h"
static int dinsig_read_cert (CARD card, const char *certidstr,
unsigned char **cert, size_t *ncert);
/* See card.c for interface description. Frankly we don't do any real
enumeration but just check whether the well know files are
available. */
static int
dinsig_enum_keypairs (CARD card, int idx,
unsigned char *keygrip, char **keyid)
{
int rc;
unsigned char *buf;
size_t buflen;
ksba_cert_t cert;
/* fixme: We should locate the application via the EF(DIR) and not
assume a Netkey card */
if (!idx)
rc = dinsig_read_cert (card, "DINSIG-DF01.C000", &buf, &buflen);
else if (idx == 1)
rc = dinsig_read_cert (card, "DINSIG-DF01.C200", &buf, &buflen);
else
rc = -1;
if (rc)
return rc;
rc = ksba_cert_new (&cert);
if (rc)
{
xfree (buf);
return rc;
}
rc = ksba_cert_init_from_mem (cert, buf, buflen);
xfree (buf);
if (rc)
{
log_error ("failed to parse the certificate at idx %d: %s\n",
idx, gpg_strerror (rc));
ksba_cert_release (cert);
return rc;
}
if (card_help_get_keygrip (cert, keygrip))
{
log_error ("failed to calculate the keygrip at index %d\n", idx);
ksba_cert_release (cert);
return gpg_error (GPG_ERR_CARD);
}
ksba_cert_release (cert);
/* return the iD */
if (keyid)
{
*keyid = xtrymalloc (17);
if (!*keyid)
return gpg_error (gpg_err_code_from_errno (errno));
if (!idx)
strcpy (*keyid, "DINSIG-DF01.C000");
else
strcpy (*keyid, "DINSIG-DF01.C200");
}
return 0;
}
/* See card.c for interface description */
static int
dinsig_read_cert (CARD card, const char *certidstr,
unsigned char **cert, size_t *ncert)
{
int rc;
struct sc_path path;
struct sc_file *file;
unsigned char *buf;
int buflen;
if (!strcmp (certidstr, "DINSIG-DF01.C000"))
sc_format_path ("3F00DF01C000", &path);
else if (!strcmp (certidstr, "DINSIG-DF01.C200"))
sc_format_path ("3F00DF01C200", &path);
else
return gpg_error (GPG_ERR_INV_ID);
rc = sc_select_file (card->scard, &path, &file);
if (rc)
{
log_error ("sc_select_file failed: %s\n", sc_strerror (rc));
return map_sc_err (rc);
}
if (file->type != SC_FILE_TYPE_WORKING_EF
|| file->ef_structure != SC_FILE_EF_TRANSPARENT)
{
log_error ("wrong type or structure of certificate EF\n");
sc_file_free (file);
return gpg_error (GPG_ERR_CARD);
}
if (file->size < 20) /* check against a somewhat arbitrary length */
{
log_error ("certificate EF too short\n");
sc_file_free (file);
return gpg_error (GPG_ERR_CARD);
}
buf = xtrymalloc (file->size);
if (!buf)
{
gpg_error_t tmperr = gpg_error (gpg_err_code_from_errno (errno));
sc_file_free (file);
return tmperr;
}
rc = sc_read_binary (card->scard, 0, buf, file->size, 0);
if (rc >= 0 && rc != file->size)
{
log_error ("short read on certificate EF\n");
sc_file_free (file);
xfree (buf);
return gpg_error (GPG_ERR_CARD);
}
sc_file_free (file);
if (rc < 0)
{
log_error ("error reading certificate EF: %s\n", sc_strerror (rc));
xfree (buf);
return map_sc_err (rc);
}
buflen = rc;
/* The object is not a plain certificate but wrapped into id-at
userCertificate - fixme: we should check the specs and decided
whether libksba should support it */
if (buflen > 9 && buf[0] == 0x30 && buf[4] == 6 && buf[5] == 3
&& buf[6] == 0x55 && buf[7] == 4 && buf[8] == 0x24)
{
/* We have to strip the padding. Although this is a good idea
anyway, we have to do it due to a KSBA problem; KSBA does not
work correct when the buffer is larger than the ASN.1
structure and the certificates here are padded with FF. So
as a workaround we look at the outer structure to get the
size of the entire thing and adjust the buflen. We can only
do this when there is a 2 byte length field */
size_t seqlen;
if (buf[1] == 0x82)
{
seqlen = ((buf[2] << 8) | buf[3]) + 4;
if (seqlen < buflen)
buflen = seqlen;
}
memmove (buf, buf+9, buflen-9);
buflen -= 9;
}
*cert = buf;
*ncert = buflen;
return 0;
}
/* Bind our operations to the card */
void
card_dinsig_bind (CARD card)
{
card->fnc.enum_keypairs = dinsig_enum_keypairs;
card->fnc.read_cert = dinsig_read_cert;
}
#endif /*HAVE_OPENSC*/
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