[openssh.git] / scard-opensc.c

/*
 * 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)
{
	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(p15card, &priv->cert_id, &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;
}

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);
	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;
}

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;

	r = sc_prkey_op_init(rsa, &key_obj);
	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 (priv->ref_count == 0) {
		free(priv);
		sc_close();
	}
	if (orig_finish)
		orig_finish(rsa);
	return 1;
}

/* engine for overloading private key operations */

static RSA_METHOD *
sc_get_rsa_method(void)
{
	static RSA_METHOD smart_rsa;
	const RSA_METHOD *def = RSA_get_default_method();

	/* use the OpenSSL version */
	memcpy(&smart_rsa, def, sizeof(smart_rsa));

	smart_rsa.name		= "opensc";

	/* overload */
	smart_rsa.rsa_priv_enc	= sc_private_encrypt;
	smart_rsa.rsa_priv_dec	= sc_private_decrypt;
	smart_rsa.rsa_sign	= sc_sign;

	/* save original */
	orig_finish		= def->finish;
	smart_rsa.finish	= sc_finish;

	return &smart_rsa;
}

#ifdef USE_ENGINE
static ENGINE *
sc_get_engine(void)
{
	static ENGINE *smart_engine = NULL;

	if ((smart_engine = ENGINE_new()) == NULL)
		fatal("ENGINE_new failed");

	ENGINE_set_id(smart_engine, "opensc");
	ENGINE_set_name(smart_engine, "OpenSC");

	ENGINE_set_RSA(smart_engine, sc_get_rsa_method());
	ENGINE_set_DSA(smart_engine, DSA_get_default_openssl_method());
	ENGINE_set_DH(smart_engine, DH_get_default_openssl_method());
	ENGINE_set_RAND(smart_engine, RAND_SSLeay());
	ENGINE_set_BN_mod_exp(smart_engine, BN_mod_exp);

	return smart_engine;
}
#endif

static void
convert_rsa_to_rsa1(Key * in, Key * out)
{
	struct sc_priv_data *priv;
	
	out->rsa->flags = in->rsa->flags;
	out->flags = in->flags;
	RSA_set_method(out->rsa, RSA_get_method(in->rsa));
	BN_copy(out->rsa->n, in->rsa->n);
	BN_copy(out->rsa->e, in->rsa->e);
	priv = RSA_get_app_data(in->rsa);
	priv->ref_count++;
	RSA_set_app_data(out->rsa, priv);
	return;
}

static int 
sc_read_pubkey(Key * k, const struct sc_pkcs15_object *cert_obj)
{
	int r;
	sc_pkcs15_cert_t *cert = NULL;
	struct sc_priv_data *priv = NULL;
	sc_pkcs15_cert_info_t *cinfo = cert_obj->data;

	X509 *x509 = NULL;
	EVP_PKEY *pubkey = NULL;
	u8 *p;
	char *tmp;
	
	debug("sc_read_pubkey() with cert id %02X", cinfo->id.value[0]);
	r = sc_pkcs15_read_certificate(p15card, cinfo, &cert);
	if (r) {
		logit("Certificate read failed: %s", sc_strerror(r));
		goto err;
	}
	x509 = X509_new();
	if (x509 == NULL) {
		r = -1; 
		goto err;
	}
	p = cert->data;
	if (!d2i_X509(&x509, &p, cert->data_len)) {
		logit("Unable to parse X.509 certificate");
		r = -1;
		goto err;
	}
	sc_pkcs15_free_certificate(cert);
	cert = NULL;
	pubkey = X509_get_pubkey(x509);
	X509_free(x509);
	x509 = NULL;
	if (pubkey->type != EVP_PKEY_RSA) {
		logit("Public key is of unknown type");
		r = -1;
		goto err;
	}
	k->rsa = EVP_PKEY_get1_RSA(pubkey);
	EVP_PKEY_free(pubkey);

	k->rsa->flags |= RSA_FLAG_SIGN_VER;
	RSA_set_method(k->rsa, sc_get_rsa_method());
	priv = xmalloc(sizeof(struct sc_priv_data));
	priv->cert_id = cinfo->id;
	priv->ref_count = 1;
	RSA_set_app_data(k->rsa, priv);

	k->flags = KEY_FLAG_EXT;
	tmp = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
	debug("fingerprint %d %s", key_size(k), tmp);
	xfree(tmp);
	
	return 0;
err:
	if (cert)
		sc_pkcs15_free_certificate(cert);
	if (pubkey)
		EVP_PKEY_free(pubkey);
	if (x509)
		X509_free(x509);
	return r;
}

Key **
sc_get_keys(const char *id, const char *pin)
{
	Key *k, **keys;
	int i, r, real_count = 0, key_count;
	sc_pkcs15_id_t cert_id;
	sc_pkcs15_object_t *certs[32];
	char *buf = xstrdup(id), *p;

	debug("sc_get_keys called: id = %s", id);

	if (sc_pin != NULL)
		xfree(sc_pin);
	sc_pin = (pin == NULL) ? NULL : xstrdup(pin);

	cert_id.len = 0;
	if ((p = strchr(buf, ':')) != NULL) {
		*p = 0;
		p++;
		sc_pkcs15_hex_string_to_id(p, &cert_id);
	}
	r = sscanf(buf, "%d", &sc_reader_id);
	xfree(buf);
	if (r != 1)
		goto err;
	if (p15card == NULL) {
		sc_close();
		r = sc_init();
		if (r) {
			error("Smartcard init failed: %s", sc_strerror(r));
			goto err;
		}
	}
	if (cert_id.len) {
		r = sc_pkcs15_find_cert_by_id(p15card, &cert_id, &certs[0]);
		if (r < 0)
			goto err;
		key_count = 1;
	} else {
		r = sc_pkcs15_get_objects(p15card, SC_PKCS15_TYPE_CERT_X509,
					  certs, 32);
		if (r == 0) {
			logit("No certificates found on smartcard");
			r = -1;
			goto err;
		} else if (r < 0) {
			error("Certificate enumeration failed: %s",
			      sc_strerror(r));
			goto err;
		}
		key_count = r;
	}
	keys = xmalloc(sizeof(Key *) * (key_count*2+1));
	for (i = 0; i < key_count; i++) {
		sc_pkcs15_object_t *tmp_obj = NULL;
		cert_id = ((sc_pkcs15_cert_info_t *)(certs[i]->data))->id;
		if (sc_pkcs15_find_prkey_by_id(p15card, &cert_id, &tmp_obj))
			/* skip the public key (certificate) if no
			 * corresponding private key is present */
			continue;
		k = key_new(KEY_RSA);
		if (k == NULL)
			break;
		r = sc_read_pubkey(k, certs[i]);
		if (r) {
			error("sc_read_pubkey failed: %s", sc_strerror(r));
			key_free(k);
			continue;
		}
		keys[real_count] = k;
		real_count++;
		k = key_new(KEY_RSA1);
		if (k == NULL)
			break;
		convert_rsa_to_rsa1(keys[real_count-1], k);
		keys[real_count] = k;
		real_count++;
	}
	keys[real_count] = NULL;

	return keys;
err:
	sc_close();
	return NULL;
}

int
sc_put_key(Key *prv, const char *id)
{
	error("key uploading not yet supported");
	return -1;
}

char *
sc_get_key_label(Key *key)
{
	int r;
	const struct sc_priv_data *priv;
	struct sc_pkcs15_object *key_obj;

	priv = (const struct sc_priv_data *) RSA_get_app_data(key->rsa);
	if (priv == NULL || p15card == NULL) {
		logit("SmartCard key not loaded");
		/* internal error => return default label */
		return xstrdup("smartcard key");
	}
	r = sc_pkcs15_find_prkey_by_id(p15card, &priv->cert_id, &key_obj);
	if (r) {
		logit("Unable to find private key from SmartCard: %s",
		      sc_strerror(r));
		return xstrdup("smartcard key");
	}
	if (key_obj == NULL || key_obj->label == NULL)
		/* the optional PKCS#15 label does not exists
		 * => return the default label */
		return xstrdup("smartcard key");
	return xstrdup(key_obj->label);
}

#endif /* SMARTCARD */
Commit	Line	Data
295c8801	1	/*
	2	* Copyright (c) 2002 Juha Yrj�l�. All rights reserved.
	3	* Copyright (c) 2001 Markus Friedl.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	*
	14	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	15	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	16	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	17	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	18	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	19	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	20	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	21	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	22	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	23	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	24	*/
	25
	26	#include "includes.h"
	27	#if defined(SMARTCARD) && defined(USE_OPENSC)
	28
	29	#include <openssl/evp.h>
	30	#include <openssl/x509.h>
	31
46c8e0f6	32	#include <opensc/opensc.h>
46c8e0f6	33	#include <opensc/pkcs15.h>
295c8801	34
	35	#include "key.h"
	36	#include "log.h"
	37	#include "xmalloc.h"
	38	#include "readpass.h"
	39	#include "scard.h"
	40
5866adb0	41	#if OPENSSL_VERSION_NUMBER < 0x00907000L && defined(CRYPTO_LOCK_ENGINE)
295c8801	42	#define USE_ENGINE
	43	#define RSA_get_default_method RSA_get_default_openssl_method
	44	#else
	45	#endif
	46
	47	#ifdef USE_ENGINE
	48	#include <openssl/engine.h>
	49	#define sc_get_rsa sc_get_engine
	50	#else
	51	#define sc_get_rsa sc_get_rsa_method
	52	#endif
	53
	54	static int sc_reader_id;
	55	static sc_context_t *ctx = NULL;
	56	static sc_card_t *card = NULL;
	57	static sc_pkcs15_card_t *p15card = NULL;
	58
	59	static char *sc_pin = NULL;
	60
	61	struct sc_priv_data
	62	{
	63	struct sc_pkcs15_id cert_id;
	64	int ref_count;
	65	};
	66
	67	void
	68	sc_close(void)
	69	{
	70	if (p15card) {
	71	sc_pkcs15_unbind(p15card);
	72	p15card = NULL;
	73	}
	74	if (card) {
	75	sc_disconnect_card(card, 0);
	76	card = NULL;
	77	}
	78	if (ctx) {
	79	sc_release_context(ctx);
	80	ctx = NULL;
	81	}
	82	}
	83
	84	static int
	85	sc_init(void)
	86	{
	87	int r;
	88
	89	r = sc_establish_context(&ctx, "openssh");
	90	if (r)
	91	goto err;
d2168412	92	if (sc_reader_id >= ctx->reader_count) {
	93	r = SC_ERROR_NO_READERS_FOUND;
	94	error("Illegal reader number %d (max %d)", sc_reader_id,
	95	ctx->reader_count -1);
	96	goto err;
	97	}
295c8801	98	r = sc_connect_card(ctx->reader[sc_reader_id], 0, &card);
	99	if (r)
	100	goto err;
	101	r = sc_pkcs15_bind(card, &p15card);
	102	if (r)
	103	goto err;
	104	return 0;
	105	err:
	106	sc_close();
	107	return r;
	108	}
	109
	110	/* private key operations */
	111
	112	static int
	113	sc_prkey_op_init(RSA rsa, struct sc_pkcs15_object *key_obj_out)
	114	{
	115	int r;
	116	struct sc_priv_data *priv;
	117	struct sc_pkcs15_object *key_obj;
	118	struct sc_pkcs15_prkey_info *key;
	119	struct sc_pkcs15_object *pin_obj;
	120	struct sc_pkcs15_pin_info *pin;
	121
	122	priv = (struct sc_priv_data *) RSA_get_app_data(rsa);
	123	if (priv == NULL)
	124	return -1;
	125	if (p15card == NULL) {
	126	sc_close();
	127	r = sc_init();
	128	if (r) {
	129	error("SmartCard init failed: %s", sc_strerror(r));
	130	goto err;
	131	}
	132	}
	133	r = sc_pkcs15_find_prkey_by_id(p15card, &priv->cert_id, &key_obj);
	134	if (r) {
	135	error("Unable to find private key from SmartCard: %s",
	136	sc_strerror(r));
	137	goto err;
	138	}
	139	key = key_obj->data;
	140	r = sc_pkcs15_find_pin_by_auth_id(p15card, &key_obj->auth_id,
	141	&pin_obj);
11f1e60e	142	if (r == SC_ERROR_OBJECT_NOT_FOUND) {
11f1e60e	143	/* no pin required */
7b7f164b	144	r = sc_lock(card);
	145	if (r) {
	146	error("Unable to lock smartcard: %s", sc_strerror(r));
	147	goto err;
	148	}
11f1e60e	149	*key_obj_out = key_obj;
	150	return 0;
	151	} else if (r) {
295c8801	152	error("Unable to find PIN object from SmartCard: %s",
	153	sc_strerror(r));
	154	goto err;
	155	}
	156	pin = pin_obj->data;
	157	r = sc_lock(card);
	158	if (r) {
	159	error("Unable to lock smartcard: %s", sc_strerror(r));
	160	goto err;
	161	}
	162	if (sc_pin != NULL) {
	163	r = sc_pkcs15_verify_pin(p15card, pin, sc_pin,
	164	strlen(sc_pin));
	165	if (r) {
	166	sc_unlock(card);
	167	error("PIN code verification failed: %s",
	168	sc_strerror(r));
	169	goto err;
	170	}
	171	}
	172	*key_obj_out = key_obj;
	173	return 0;
	174	err:
	175	sc_close();
	176	return -1;
	177	}
	178
	179	static int
	180	sc_private_decrypt(int flen, u_char from, u_char to, RSA *rsa,
	181	int padding)
	182	{
	183	struct sc_pkcs15_object *key_obj;
	184	int r;
	185
	186	if (padding != RSA_PKCS1_PADDING)
	187	return -1;
	188	r = sc_prkey_op_init(rsa, &key_obj);
	189	if (r)
	190	return -1;
8acdec60	191	r = sc_pkcs15_decipher(p15card, key_obj, SC_ALGORITHM_RSA_PAD_PKCS1,
8acdec60	192	from, flen, to, flen);
295c8801	193	sc_unlock(card);
	194	if (r < 0) {
	195	error("sc_pkcs15_decipher() failed: %s", sc_strerror(r));
	196	goto err;
	197	}
	198	return r;
	199	err:
	200	sc_close();
	201	return -1;
	202	}
	203
	204	static int
	205	sc_sign(int type, u_char *m, unsigned int m_len,
	206	unsigned char sigret, unsigned int siglen, RSA *rsa)
	207	{
	208	struct sc_pkcs15_object *key_obj;
	209	int r;
	210	unsigned long flags = 0;
	211
	212	r = sc_prkey_op_init(rsa, &key_obj);
	213	if (r)
	214	return -1;
	215	/* FIXME: length of sigret correct? */
	216	/* FIXME: check 'type' and modify flags accordingly */
	217	flags = SC_ALGORITHM_RSA_PAD_PKCS1 \| SC_ALGORITHM_RSA_HASH_SHA1;
	218	r = sc_pkcs15_compute_signature(p15card, key_obj, flags,
	219	m, m_len, sigret, RSA_size(rsa));
	220	sc_unlock(card);
	221	if (r < 0) {
	222	error("sc_pkcs15_compute_signature() failed: %s",
	223	sc_strerror(r));
	224	goto err;
	225	}
	226	*siglen = r;
	227	return 1;
	228	err:
	229	sc_close();
	230	return 0;
	231	}
	232
	233	static int
	234	sc_private_encrypt(int flen, u_char from, u_char to, RSA *rsa,
	235	int padding)
	236	{
	237	error("Private key encryption not supported");
	238	return -1;
	239	}
	240
	241	/* called on free */
	242
	243	static int (orig_finish)(RSA rsa) = NULL;
	244
	245	static int
	246	sc_finish(RSA *rsa)
	247	{
	248	struct sc_priv_data *priv;
	249
	250	priv = RSA_get_app_data(rsa);
	251	priv->ref_count--;
	252	if (priv->ref_count == 0) {
	253	free(priv);
	254	sc_close();
	255	}
	256	if (orig_finish)
257	orig_finish(rsa);
258	return 1;
259	}
260
261	/* engine for overloading private key operations */
262
263	static RSA_METHOD *
264	sc_get_rsa_method(void)
265	{
266	static RSA_METHOD smart_rsa;
267	const RSA_METHOD *def = RSA_get_default_method();
268
269	/* use the OpenSSL version */
270	memcpy(&smart_rsa, def, sizeof(smart_rsa));
271
272	smart_rsa.name = "opensc";
273
274	/* overload */
275	smart_rsa.rsa_priv_enc = sc_private_encrypt;
276	smart_rsa.rsa_priv_dec = sc_private_decrypt;
277	smart_rsa.rsa_sign = sc_sign;
278
279	/* save original */
280	orig_finish = def->finish;
281	smart_rsa.finish = sc_finish;
282
283	return &smart_rsa;
284	}
285
286	#ifdef USE_ENGINE
287	static ENGINE *
288	sc_get_engine(void)
289	{
290	static ENGINE *smart_engine = NULL;
291
292	if ((smart_engine = ENGINE_new()) == NULL)
293	fatal("ENGINE_new failed");
294
295	ENGINE_set_id(smart_engine, "opensc");
296	ENGINE_set_name(smart_engine, "OpenSC");
297
298	ENGINE_set_RSA(smart_engine, sc_get_rsa_method());
299	ENGINE_set_DSA(smart_engine, DSA_get_default_openssl_method());
300	ENGINE_set_DH(smart_engine, DH_get_default_openssl_method());
301	ENGINE_set_RAND(smart_engine, RAND_SSLeay());
302	ENGINE_set_BN_mod_exp(smart_engine, BN_mod_exp);
303
304	return smart_engine;
305	}
306	#endif
307
308	static void
309	convert_rsa_to_rsa1(Key * in, Key * out)
310	{
311	struct sc_priv_data *priv;
312
313	out->rsa->flags = in->rsa->flags;
314	out->flags = in->flags;
315	RSA_set_method(out->rsa, RSA_get_method(in->rsa));
316	BN_copy(out->rsa->n, in->rsa->n);
317	BN_copy(out->rsa->e, in->rsa->e);
318	priv = RSA_get_app_data(in->rsa);
319	priv->ref_count++;
320	RSA_set_app_data(out->rsa, priv);
321	return;
322	}
323
324	static int
325	sc_read_pubkey(Key * k, const struct sc_pkcs15_object *cert_obj)
326	{
327	int r;
328	sc_pkcs15_cert_t *cert = NULL;
329	struct sc_priv_data *priv = NULL;
330	sc_pkcs15_cert_info_t *cinfo = cert_obj->data;
331
332	X509 *x509 = NULL;
333	EVP_PKEY *pubkey = NULL;
334	u8 *p;
335	char *tmp;
336
337	debug("sc_read_pubkey() with cert id %02X", cinfo->id.value[0]);
338	r = sc_pkcs15_read_certificate(p15card, cinfo, &cert);
339	if (r) {
bbe88b6d	340	logit("Certificate read failed: %s", sc_strerror(r));
295c8801	341	goto err;
	342	}
	343	x509 = X509_new();
	344	if (x509 == NULL) {
	345	r = -1;
	346	goto err;
	347	}
	348	p = cert->data;
	349	if (!d2i_X509(&x509, &p, cert->data_len)) {
bbe88b6d	350	logit("Unable to parse X.509 certificate");
295c8801	351	r = -1;
	352	goto err;
	353	}
	354	sc_pkcs15_free_certificate(cert);
	355	cert = NULL;
	356	pubkey = X509_get_pubkey(x509);
	357	X509_free(x509);
	358	x509 = NULL;
	359	if (pubkey->type != EVP_PKEY_RSA) {
bbe88b6d	360	logit("Public key is of unknown type");
295c8801	361	r = -1;
	362	goto err;
	363	}
	364	k->rsa = EVP_PKEY_get1_RSA(pubkey);
	365	EVP_PKEY_free(pubkey);
	366
	367	k->rsa->flags \|= RSA_FLAG_SIGN_VER;
	368	RSA_set_method(k->rsa, sc_get_rsa_method());
	369	priv = xmalloc(sizeof(struct sc_priv_data));
	370	priv->cert_id = cinfo->id;
	371	priv->ref_count = 1;
	372	RSA_set_app_data(k->rsa, priv);
	373
	374	k->flags = KEY_FLAG_EXT;
	375	tmp = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
	376	debug("fingerprint %d %s", key_size(k), tmp);
	377	xfree(tmp);
	378
	379	return 0;
	380	err:
	381	if (cert)
	382	sc_pkcs15_free_certificate(cert);
	383	if (pubkey)
	384	EVP_PKEY_free(pubkey);
	385	if (x509)
	386	X509_free(x509);
	387	return r;
	388	}
	389
	390	Key **
	391	sc_get_keys(const char id, const char pin)
	392	{
	393	Key k, *keys;
	394	int i, r, real_count = 0, key_count;
	395	sc_pkcs15_id_t cert_id;
	396	sc_pkcs15_object_t *certs[32];
	397	char buf = xstrdup(id), p;
	398
	399	debug("sc_get_keys called: id = %s", id);
	400
	401	if (sc_pin != NULL)
	402	xfree(sc_pin);
	403	sc_pin = (pin == NULL) ? NULL : xstrdup(pin);
	404
	405	cert_id.len = 0;
	406	if ((p = strchr(buf, ':')) != NULL) {
	407	*p = 0;
	408	p++;
	409	sc_pkcs15_hex_string_to_id(p, &cert_id);
	410	}
	411	r = sscanf(buf, "%d", &sc_reader_id);
	412	xfree(buf);
	413	if (r != 1)
	414	goto err;
	415	if (p15card == NULL) {
	416	sc_close();
	417	r = sc_init();
	418	if (r) {
	419	error("Smartcard init failed: %s", sc_strerror(r));
	420	goto err;
	421	}
	422	}
	423	if (cert_id.len) {
	424	r = sc_pkcs15_find_cert_by_id(p15card, &cert_id, &certs[0]);
425	if (r < 0)
426	goto err;
427	key_count = 1;
428	} else {
429	r = sc_pkcs15_get_objects(p15card, SC_PKCS15_TYPE_CERT_X509,
430	certs, 32);
431	if (r == 0) {
bbe88b6d	432	logit("No certificates found on smartcard");
295c8801	433	r = -1;
	434	goto err;
	435	} else if (r < 0) {
	436	error("Certificate enumeration failed: %s",
	437	sc_strerror(r));
	438	goto err;
	439	}
	440	key_count = r;
	441	}
295c8801	442	keys = xmalloc(sizeof(Key ) (key_count*2+1));
295c8801	443	for (i = 0; i < key_count; i++) {
7b7f164b	444	sc_pkcs15_object_t *tmp_obj = NULL;
	445	cert_id = ((sc_pkcs15_cert_info_t *)(certs[i]->data))->id;
	446	if (sc_pkcs15_find_prkey_by_id(p15card, &cert_id, &tmp_obj))
	447	/* skip the public key (certificate) if no
	448	* corresponding private key is present */
	449	continue;
295c8801	450	k = key_new(KEY_RSA);
	451	if (k == NULL)
	452	break;
	453	r = sc_read_pubkey(k, certs[i]);
	454	if (r) {
	455	error("sc_read_pubkey failed: %s", sc_strerror(r));
	456	key_free(k);
	457	continue;
	458	}
	459	keys[real_count] = k;
	460	real_count++;
	461	k = key_new(KEY_RSA1);
	462	if (k == NULL)
	463	break;
	464	convert_rsa_to_rsa1(keys[real_count-1], k);
	465	keys[real_count] = k;
	466	real_count++;
	467	}
	468	keys[real_count] = NULL;
	469
	470	return keys;
	471	err:
	472	sc_close();
	473	return NULL;
	474	}
	475
	476	int
	477	sc_put_key(Key prv, const char id)
	478	{
	479	error("key uploading not yet supported");
	480	return -1;
	481	}
	482
9ea150a7	483	char *
	484	sc_get_key_label(Key *key)
	485	{
	486	int r;
	487	const struct sc_priv_data *priv;
	488	struct sc_pkcs15_object *key_obj;
	489
	490	priv = (const struct sc_priv_data *) RSA_get_app_data(key->rsa);
	491	if (priv == NULL \|\| p15card == NULL) {
	492	logit("SmartCard key not loaded");
	493	/* internal error => return default label */
	494	return xstrdup("smartcard key");
	495	}
	496	r = sc_pkcs15_find_prkey_by_id(p15card, &priv->cert_id, &key_obj);
	497	if (r) {
	498	logit("Unable to find private key from SmartCard: %s",
	499	sc_strerror(r));
	500	return xstrdup("smartcard key");
	501	}
	502	if (key_obj == NULL \|\| key_obj->label == NULL)
	503	/* the optional PKCS#15 label does not exists
	504	* => return the default label */
	505	return xstrdup("smartcard key");
	506	return xstrdup(key_obj->label);
	507	}
	508
295c8801	509	#endif /* SMARTCARD */