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/*
* Copyright (c) 2002 Juha Yrj�l�. All rights reserved.
* Copyright (c) 2001 Markus Friedl.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "includes.h"
#if defined(SMARTCARD) && defined(USE_OPENSC)
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <opensc/opensc.h>
#include <opensc/pkcs15.h>
#include "key.h"
#include "log.h"
#include "xmalloc.h"
#include "readpass.h"
#include "scard.h"
#if OPENSSL_VERSION_NUMBER < 0x00907000L && defined(CRYPTO_LOCK_ENGINE)
#define USE_ENGINE
#define RSA_get_default_method RSA_get_default_openssl_method
#else
#endif
#ifdef USE_ENGINE
#include <openssl/engine.h>
#define sc_get_rsa sc_get_engine
#else
#define sc_get_rsa sc_get_rsa_method
#endif
static int sc_reader_id;
static sc_context_t *ctx = NULL;
static sc_card_t *card = NULL;
static sc_pkcs15_card_t *p15card = NULL;
static char *sc_pin = NULL;
struct sc_priv_data
{
struct sc_pkcs15_id cert_id;
int ref_count;
};
void
sc_close(void)
{
if (p15card) {
sc_pkcs15_unbind(p15card);
p15card = NULL;
}
if (card) {
sc_disconnect_card(card, 0);
card = NULL;
}
if (ctx) {
sc_release_context(ctx);
ctx = NULL;
}
}
static int
sc_init(void)
{
int r;
r = sc_establish_context(&ctx, "openssh");
if (r)
goto err;
if (sc_reader_id >= ctx->reader_count) {
r = SC_ERROR_NO_READERS_FOUND;
error("Illegal reader number %d (max %d)", sc_reader_id,
ctx->reader_count -1);
goto err;
}
r = sc_connect_card(ctx->reader[sc_reader_id], 0, &card);
if (r)
goto err;
r = sc_pkcs15_bind(card, &p15card);
if (r)
goto err;
return 0;
err:
sc_close();
return r;
}
/* private key operations */
static int
sc_prkey_op_init(RSA *rsa, struct sc_pkcs15_object **key_obj_out,
unsigned int usage)
{
int r;
struct sc_priv_data *priv;
struct sc_pkcs15_object *key_obj;
struct sc_pkcs15_prkey_info *key;
struct sc_pkcs15_object *pin_obj;
struct sc_pkcs15_pin_info *pin;
priv = (struct sc_priv_data *) RSA_get_app_data(rsa);
if (priv == NULL)
return -1;
if (p15card == NULL) {
sc_close();
r = sc_init();
if (r) {
error("SmartCard init failed: %s", sc_strerror(r));
goto err;
}
}
r = sc_pkcs15_find_prkey_by_id_usage(p15card, &priv->cert_id,
usage, &key_obj);
if (r) {
error("Unable to find private key from SmartCard: %s",
sc_strerror(r));
goto err;
}
key = key_obj->data;
r = sc_pkcs15_find_pin_by_auth_id(p15card, &key_obj->auth_id,
&pin_obj);
if (r == SC_ERROR_OBJECT_NOT_FOUND) {
/* no pin required */
r = sc_lock(card);
if (r) {
error("Unable to lock smartcard: %s", sc_strerror(r));
goto err;
}
*key_obj_out = key_obj;
return 0;
} else if (r) {
error("Unable to find PIN object from SmartCard: %s",
sc_strerror(r));
goto err;
}
pin = pin_obj->data;
r = sc_lock(card);
if (r) {
error("Unable to lock smartcard: %s", sc_strerror(r));
goto err;
}
if (sc_pin != NULL) {
r = sc_pkcs15_verify_pin(p15card, pin, sc_pin,
strlen(sc_pin));
if (r) {
sc_unlock(card);
error("PIN code verification failed: %s",
sc_strerror(r));
goto err;
}
}
*key_obj_out = key_obj;
return 0;
err:
sc_close();
return -1;
}
#define SC_USAGE_DECRYPT SC_PKCS15_PRKEY_USAGE_DECRYPT | \
SC_PKCS15_PRKEY_USAGE_UNWRAP
static int
sc_private_decrypt(int flen, u_char *from, u_char *to, RSA *rsa,
int padding)
{
struct sc_pkcs15_object *key_obj;
int r;
if (padding != RSA_PKCS1_PADDING)
return -1;
r = sc_prkey_op_init(rsa, &key_obj, SC_USAGE_DECRYPT);
if (r)
return -1;
r = sc_pkcs15_decipher(p15card, key_obj, SC_ALGORITHM_RSA_PAD_PKCS1,
from, flen, to, flen);
sc_unlock(card);
if (r < 0) {
error("sc_pkcs15_decipher() failed: %s", sc_strerror(r));
goto err;
}
return r;
err:
sc_close();
return -1;
}
#define SC_USAGE_SIGN SC_PKCS15_PRKEY_USAGE_SIGN | \
SC_PKCS15_PRKEY_USAGE_SIGNRECOVER
static int
sc_sign(int type, u_char *m, unsigned int m_len,
unsigned char *sigret, unsigned int *siglen, RSA *rsa)
{
struct sc_pkcs15_object *key_obj;
int r;
unsigned long flags = 0;
/* XXX: sc_prkey_op_init will search for a pkcs15 private
* key object with the sign or signrecover usage flag set.
* If the signing key has only the non-repudiation flag set
* the key will be rejected as using a non-repudiation key
* for authentication is not recommended. Note: This does not
* prevent the use of a non-repudiation key for authentication
* if the sign or signrecover flag is set as well.
*/
r = sc_prkey_op_init(rsa, &key_obj, SC_USAGE_SIGN);
if (r)
return -1;
/* FIXME: length of sigret correct? */
/* FIXME: check 'type' and modify flags accordingly */
flags = SC_ALGORITHM_RSA_PAD_PKCS1 | SC_ALGORITHM_RSA_HASH_SHA1;
r = sc_pkcs15_compute_signature(p15card, key_obj, flags,
m, m_len, sigret, RSA_size(rsa));
sc_unlock(card);
if (r < 0) {
error("sc_pkcs15_compute_signature() failed: %s",
sc_strerror(r));
goto err;
}
*siglen = r;
return 1;
err:
sc_close();
return 0;
}
static int
sc_private_encrypt(int flen, u_char *from, u_char *to, RSA *rsa,
int padding)
{
error("Private key encryption not supported");
return -1;
}
/* called on free */
static int (*orig_finish)(RSA *rsa) = NULL;
static int
sc_finish(RSA *rsa)
{
struct sc_priv_data *priv;
priv = RSA_get_app_data(rsa);
priv->ref_count--;
if
|