mirror of
git://git.gnupg.org/gnupg.git
synced 2024-11-04 20:38:50 +01:00
503 lines
13 KiB
C
503 lines
13 KiB
C
/* card-p15.c - PKCS-15 based card access
|
||
* 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 2 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, write to the Free Software
|
||
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
|
||
*/
|
||
|
||
#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 <ksba.h>
|
||
|
||
#include "scdaemon.h"
|
||
#include "card-common.h"
|
||
|
||
|
||
struct p15private_s {
|
||
int n_prkey_rsa_objs;
|
||
struct sc_pkcs15_object *prkey_rsa_objs[32];
|
||
int n_cert_objs;
|
||
struct sc_pkcs15_object *cert_objs[32];
|
||
};
|
||
|
||
|
||
/* Allocate private data. */
|
||
static int
|
||
init_private_data (CARD card)
|
||
{
|
||
struct p15private_s *priv;
|
||
int rc;
|
||
|
||
if (card->p15priv)
|
||
return 0; /* already done. */
|
||
|
||
priv = xtrycalloc (1, sizeof *priv);
|
||
if (!priv)
|
||
return out_of_core ();
|
||
|
||
/* OpenSC (0.7.0) is a bit strange in that the get_objects functions
|
||
tries to be a bit too clever and implicitly does an enumeration
|
||
which eventually leads to the fact that every call to this
|
||
fucntion returns one more macthing object. The old code in
|
||
p15_enum_keypairs assume that it would alwyas return the same
|
||
numer of objects and used this to figure out what the last object
|
||
enumerated is. We now do an enum_objects just once and keep it
|
||
in the private data. */
|
||
rc = sc_pkcs15_get_objects (card->p15card, SC_PKCS15_TYPE_PRKEY_RSA,
|
||
priv->prkey_rsa_objs,
|
||
DIM (priv->prkey_rsa_objs));
|
||
if (rc < 0)
|
||
{
|
||
log_error ("private keys enumeration failed: %s\n", sc_strerror (rc));
|
||
xfree (priv);
|
||
return gpg_error (GPG_ERR_CARD);
|
||
}
|
||
priv->n_prkey_rsa_objs = rc;
|
||
|
||
/* Read all certificate objects. */
|
||
rc = sc_pkcs15_get_objects (card->p15card, SC_PKCS15_TYPE_CERT_X509,
|
||
priv->cert_objs,
|
||
DIM (priv->cert_objs));
|
||
if (rc < 0)
|
||
{
|
||
log_error ("private keys enumeration failed: %s\n", sc_strerror (rc));
|
||
xfree (priv);
|
||
return gpg_error (GPG_ERR_CARD);
|
||
}
|
||
priv->n_cert_objs = rc;
|
||
|
||
card->p15priv = priv;
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Release private data used in this module. */
|
||
void
|
||
p15_release_private_data (CARD card)
|
||
{
|
||
if (!card->p15priv)
|
||
return;
|
||
xfree (card->p15priv);
|
||
card->p15priv = NULL;
|
||
}
|
||
|
||
|
||
|
||
/* See card.c for interface description */
|
||
static int
|
||
p15_enum_keypairs (CARD card, int idx,
|
||
unsigned char *keygrip, char **keyid)
|
||
{
|
||
int rc;
|
||
KsbaError krc;
|
||
struct p15private_s *priv;
|
||
struct sc_pkcs15_object *tmpobj;
|
||
int nobjs;
|
||
struct sc_pkcs15_prkey_info *pinfo;
|
||
struct sc_pkcs15_cert_info *certinfo;
|
||
struct sc_pkcs15_cert *certder;
|
||
KsbaCert cert;
|
||
|
||
rc = init_private_data (card);
|
||
if (rc)
|
||
return rc;
|
||
priv = card->p15priv;
|
||
nobjs = priv->n_prkey_rsa_objs;
|
||
rc = 0;
|
||
if (idx >= nobjs)
|
||
return -1;
|
||
pinfo = priv->prkey_rsa_objs[idx]->data;
|
||
|
||
/* now we need to read the certificate so that we can calculate the
|
||
keygrip */
|
||
rc = sc_pkcs15_find_cert_by_id (card->p15card, &pinfo->id, &tmpobj);
|
||
if (rc)
|
||
{
|
||
log_info ("certificate for private key %d not found: %s\n",
|
||
idx, sc_strerror (rc));
|
||
/* note, that we return the ID anyway */
|
||
rc = gpg_error (GPG_ERR_MISSING_CERTIFICATE);
|
||
goto return_keyid;
|
||
}
|
||
certinfo = tmpobj->data;
|
||
rc = sc_pkcs15_read_certificate (card->p15card, certinfo, &certder);
|
||
if (rc)
|
||
{
|
||
log_info ("failed to read certificate for private key %d: %s\n",
|
||
idx, sc_strerror (rc));
|
||
return gpg_error (GPG_ERR_CARD);
|
||
}
|
||
|
||
cert = ksba_cert_new ();
|
||
if (!cert)
|
||
{
|
||
gpg_error_t tmperr = out_of_core ();
|
||
sc_pkcs15_free_certificate (certder);
|
||
return tmperr;
|
||
}
|
||
krc = ksba_cert_init_from_mem (cert, certder->data, certder->data_len);
|
||
sc_pkcs15_free_certificate (certder);
|
||
if (krc)
|
||
{
|
||
log_error ("failed to parse the certificate for private key %d: %s\n",
|
||
idx, ksba_strerror (krc));
|
||
ksba_cert_release (cert);
|
||
return gpg_error (GPG_ERR_CARD);
|
||
}
|
||
if (card_help_get_keygrip (cert, keygrip))
|
||
{
|
||
log_error ("failed to calculate the keygrip of private key %d\n", idx);
|
||
ksba_cert_release (cert);
|
||
return gpg_error (GPG_ERR_CARD);
|
||
}
|
||
ksba_cert_release (cert);
|
||
|
||
rc = 0;
|
||
return_keyid:
|
||
if (keyid)
|
||
{
|
||
char *p;
|
||
int i;
|
||
|
||
*keyid = p = xtrymalloc (9+pinfo->id.len*2+1);
|
||
if (!*keyid)
|
||
return out_of_core ();
|
||
p = stpcpy (p, "P15-5015.");
|
||
for (i=0; i < pinfo->id.len; i++, p += 2)
|
||
sprintf (p, "%02X", pinfo->id.value[i]);
|
||
*p = 0;
|
||
}
|
||
|
||
return rc;
|
||
}
|
||
|
||
/* See card.c for interface description */
|
||
static int
|
||
p15_enum_certs (CARD card, int idx, char **certid, int *type)
|
||
{
|
||
int rc;
|
||
struct p15private_s *priv;
|
||
struct sc_pkcs15_object *obj;
|
||
struct sc_pkcs15_cert_info *cinfo;
|
||
int nobjs;
|
||
|
||
rc = init_private_data (card);
|
||
if (rc)
|
||
return rc;
|
||
priv = card->p15priv;
|
||
nobjs = priv->n_cert_objs;
|
||
rc = 0;
|
||
if (idx >= nobjs)
|
||
return -1;
|
||
obj = priv->cert_objs[idx];
|
||
cinfo = obj->data;
|
||
|
||
if (certid)
|
||
{
|
||
char *p;
|
||
int i;
|
||
|
||
*certid = p = xtrymalloc (9+cinfo->id.len*2+1);
|
||
if (!*certid)
|
||
return out_of_core ();
|
||
p = stpcpy (p, "P15-5015.");
|
||
for (i=0; i < cinfo->id.len; i++, p += 2)
|
||
sprintf (p, "%02X", cinfo->id.value[i]);
|
||
*p = 0;
|
||
}
|
||
if (type)
|
||
{
|
||
if (!obj->df)
|
||
*type = 0; /* unknown */
|
||
else if (obj->df->type == SC_PKCS15_CDF)
|
||
*type = 100;
|
||
else if (obj->df->type == SC_PKCS15_CDF_TRUSTED)
|
||
*type = 101;
|
||
else if (obj->df->type == SC_PKCS15_CDF_USEFUL)
|
||
*type = 102;
|
||
else
|
||
*type = 0; /* error -> unknown */
|
||
}
|
||
|
||
return rc;
|
||
}
|
||
|
||
|
||
|
||
static int
|
||
idstr_to_id (const char *idstr, struct sc_pkcs15_id *id)
|
||
{
|
||
const char *s;
|
||
int n;
|
||
|
||
/* For now we only support the standard DF */
|
||
if (strncmp (idstr, "P15-5015.", 9) )
|
||
return gpg_error (GPG_ERR_INV_ID);
|
||
for (s=idstr+9, n=0; hexdigitp (s); s++, n++)
|
||
;
|
||
if (*s || (n&1))
|
||
return gpg_error (GPG_ERR_INV_ID); /*invalid or odd number of digits*/
|
||
n /= 2;
|
||
if (!n || n > SC_PKCS15_MAX_ID_SIZE)
|
||
return gpg_error (GPG_ERR_INV_ID); /* empty or too large */
|
||
for (s=idstr+9, n=0; *s; s += 2, n++)
|
||
id->value[n] = xtoi_2 (s);
|
||
id->len = n;
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* See card.c for interface description */
|
||
static int
|
||
p15_read_cert (CARD card, const char *certidstr,
|
||
unsigned char **cert, size_t *ncert)
|
||
{
|
||
struct sc_pkcs15_object *tmpobj;
|
||
struct sc_pkcs15_id certid;
|
||
struct sc_pkcs15_cert_info *certinfo;
|
||
struct sc_pkcs15_cert *certder;
|
||
int rc;
|
||
|
||
if (!card || !certidstr || !cert || !ncert)
|
||
return gpg_error (GPG_ERR_INV_VALUE);
|
||
if (!card->p15card)
|
||
return gpg_error (GPG_ERR_NO_PKCS15_APP);
|
||
|
||
rc = idstr_to_id (certidstr, &certid);
|
||
if (rc)
|
||
return rc;
|
||
|
||
rc = sc_pkcs15_find_cert_by_id (card->p15card, &certid, &tmpobj);
|
||
if (rc)
|
||
{
|
||
log_info ("certificate '%s' not found: %s\n",
|
||
certidstr, sc_strerror (rc));
|
||
return -1;
|
||
}
|
||
certinfo = tmpobj->data;
|
||
rc = sc_pkcs15_read_certificate (card->p15card, certinfo, &certder);
|
||
if (rc)
|
||
{
|
||
log_info ("failed to read certificate '%s': %s\n",
|
||
certidstr, sc_strerror (rc));
|
||
return gpg_error (GPG_ERR_CARD);
|
||
}
|
||
|
||
*cert = xtrymalloc (certder->data_len);
|
||
if (!*cert)
|
||
{
|
||
gpg_error_t tmperr = out_of_core ();
|
||
sc_pkcs15_free_certificate (certder);
|
||
return tmperr;
|
||
}
|
||
memcpy (*cert, certder->data, certder->data_len);
|
||
*ncert = certder->data_len;
|
||
sc_pkcs15_free_certificate (certder);
|
||
return 0;
|
||
}
|
||
|
||
|
||
|
||
|
||
|
||
static int
|
||
p15_prepare_key (CARD card, const char *keyidstr,
|
||
int (pincb)(void*, const char *, char **),
|
||
void *pincb_arg, struct sc_pkcs15_object **r_keyobj)
|
||
{
|
||
struct sc_pkcs15_id keyid;
|
||
struct sc_pkcs15_pin_info *pin;
|
||
struct sc_pkcs15_object *keyobj, *pinobj;
|
||
char *pinvalue;
|
||
int rc;
|
||
|
||
rc = idstr_to_id (keyidstr, &keyid);
|
||
if (rc)
|
||
return rc;
|
||
|
||
rc = sc_pkcs15_find_prkey_by_id (card->p15card, &keyid, &keyobj);
|
||
if (rc < 0)
|
||
{
|
||
log_error ("private key not found: %s\n", sc_strerror(rc));
|
||
return gpg_error (GPG_ERR_NO_SECRET_KEY);
|
||
}
|
||
|
||
rc = sc_pkcs15_find_pin_by_auth_id (card->p15card,
|
||
&keyobj->auth_id, &pinobj);
|
||
if (rc)
|
||
{
|
||
log_error ("failed to find PIN by auth ID: %s\n", sc_strerror (rc));
|
||
return gpg_error (GPG_ERR_BAD_PIN_METHOD);
|
||
}
|
||
pin = pinobj->data;
|
||
|
||
/* Fixme: pack this into a verification loop */
|
||
/* Fixme: we might want to pass pin->min_length and
|
||
pin->stored_length */
|
||
rc = pincb (pincb_arg, pinobj->label, &pinvalue);
|
||
if (rc)
|
||
{
|
||
log_info ("PIN callback returned error: %s\n", gnupg_strerror (rc));
|
||
return rc;
|
||
}
|
||
|
||
rc = sc_pkcs15_verify_pin (card->p15card, pin,
|
||
pinvalue, strlen (pinvalue));
|
||
xfree (pinvalue);
|
||
if (rc)
|
||
{
|
||
log_info ("PIN verification failed: %s\n", sc_strerror (rc));
|
||
return gpg_error (GPG_ERR_BAD_PIN);
|
||
}
|
||
|
||
/* fixme: check wheter we need to release KEYOBJ in case of an error */
|
||
*r_keyobj = keyobj;
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* See card.c for interface description */
|
||
static int
|
||
p15_sign (CARD card, const char *keyidstr, int hashalgo,
|
||
int (pincb)(void*, const char *, char **),
|
||
void *pincb_arg,
|
||
const void *indata, size_t indatalen,
|
||
void **outdata, size_t *outdatalen )
|
||
{
|
||
unsigned int cryptflags;
|
||
struct sc_pkcs15_object *keyobj;
|
||
int rc;
|
||
unsigned char *outbuf = NULL;
|
||
size_t outbuflen;
|
||
|
||
if (hashalgo != GCRY_MD_SHA1)
|
||
return gpg_error (GPG_ERR_UNSUPPORTED_ALGORITHM);
|
||
|
||
rc = p15_prepare_key (card, keyidstr, pincb, pincb_arg, &keyobj);
|
||
if (rc)
|
||
return rc;
|
||
|
||
cryptflags = SC_ALGORITHM_RSA_PAD_PKCS1;
|
||
|
||
outbuflen = 1024;
|
||
outbuf = xtrymalloc (outbuflen);
|
||
if (!outbuf)
|
||
return out_of_core ();
|
||
|
||
rc = sc_pkcs15_compute_signature (card->p15card, keyobj,
|
||
cryptflags,
|
||
indata, indatalen,
|
||
outbuf, outbuflen );
|
||
if (rc < 0)
|
||
{
|
||
log_error ("failed to create signature: %s\n", sc_strerror (rc));
|
||
rc = gpg_error (GPG_ERR_CARD);
|
||
}
|
||
else
|
||
{
|
||
*outdatalen = rc;
|
||
*outdata = outbuf;
|
||
outbuf = NULL;
|
||
rc = 0;
|
||
}
|
||
|
||
xfree (outbuf);
|
||
return rc;
|
||
}
|
||
|
||
|
||
/* See card.c for description */
|
||
static int
|
||
p15_decipher (CARD card, const char *keyidstr,
|
||
int (pincb)(void*, const char *, char **),
|
||
void *pincb_arg,
|
||
const void *indata, size_t indatalen,
|
||
void **outdata, size_t *outdatalen )
|
||
{
|
||
struct sc_pkcs15_object *keyobj;
|
||
int rc;
|
||
unsigned char *outbuf = NULL;
|
||
size_t outbuflen;
|
||
|
||
rc = p15_prepare_key (card, keyidstr, pincb, pincb_arg, &keyobj);
|
||
if (rc)
|
||
return rc;
|
||
|
||
if (card && card->scard && card->scard->driver
|
||
&& !strcasecmp (card->scard->driver->short_name, "tcos"))
|
||
{
|
||
/* very ugly hack to force the use of a local key. We need this
|
||
until we have fixed the initialization code for TCOS cards */
|
||
struct sc_pkcs15_prkey_info *prkey = keyobj->data;
|
||
if ( !(prkey->key_reference & 0x80))
|
||
{
|
||
prkey->key_reference |= 0x80;
|
||
log_debug ("using TCOS hack to force the use of local keys\n");
|
||
}
|
||
if (*keyidstr && keyidstr[strlen(keyidstr)-1] == '6')
|
||
{
|
||
prkey->key_reference |= 1;
|
||
log_debug ("warning: using even more TCOS hacks\n");
|
||
}
|
||
}
|
||
|
||
outbuflen = indatalen < 256? 256 : indatalen;
|
||
outbuf = xtrymalloc (outbuflen);
|
||
if (!outbuf)
|
||
return out_of_core ();
|
||
|
||
rc = sc_pkcs15_decipher (card->p15card, keyobj,
|
||
0,
|
||
indata, indatalen,
|
||
outbuf, outbuflen);
|
||
if (rc < 0)
|
||
{
|
||
log_error ("failed to decipher the data: %s\n", sc_strerror (rc));
|
||
rc = gpg_error (GPG_ERR_CARD);
|
||
}
|
||
else
|
||
{
|
||
*outdatalen = rc;
|
||
*outdata = outbuf;
|
||
outbuf = NULL;
|
||
rc = 0;
|
||
}
|
||
|
||
xfree (outbuf);
|
||
return rc;
|
||
}
|
||
|
||
|
||
|
||
/* Bind our operations to the card */
|
||
void
|
||
card_p15_bind (CARD card)
|
||
{
|
||
card->fnc.enum_keypairs = p15_enum_keypairs;
|
||
card->fnc.enum_certs = p15_enum_certs;
|
||
card->fnc.read_cert = p15_read_cert;
|
||
card->fnc.sign = p15_sign;
|
||
card->fnc.decipher = p15_decipher;
|
||
}
|
||
#endif /*HAVE_OPENSC*/
|