[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 <sys/types.h>

#include <openssl/evp.h>
#include <openssl/x509.h>

#include <stdarg.h>

#include <opensc/opensc.h>
#include <opensc/pkcs15.h>

#include "key.h"
#include "log.h"
#include "xmalloc.h"
#include "misc.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 (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;
	}
	if (key_count > 1024)
		fatal("Too many keys (%u), expected <= 1024", key_count);
	keys = xcalloc(key_count * 2 + 1, sizeof(Key *));
	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.
aff51935	4	*
295c8801	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
24436b92	29	#include <sys/types.h>
24436b92	30
295c8801	31	#include <openssl/evp.h>
	32	#include <openssl/x509.h>
	33
24436b92	34	#include <stdarg.h>
24436b92	35
46c8e0f6	36	#include <opensc/opensc.h>
46c8e0f6	37	#include <opensc/pkcs15.h>
295c8801	38
	39	#include "key.h"
	40	#include "log.h"
	41	#include "xmalloc.h"
0f3ee929	42	#include "misc.h"
295c8801	43	#include "scard.h"
295c8801	44
5866adb0	45	#if OPENSSL_VERSION_NUMBER < 0x00907000L && defined(CRYPTO_LOCK_ENGINE)
295c8801	46	#define USE_ENGINE
	47	#define RSA_get_default_method RSA_get_default_openssl_method
	48	#else
	49	#endif
	50
	51	#ifdef USE_ENGINE
	52	#include <openssl/engine.h>
	53	#define sc_get_rsa sc_get_engine
	54	#else
	55	#define sc_get_rsa sc_get_rsa_method
	56	#endif
	57
	58	static int sc_reader_id;
	59	static sc_context_t *ctx = NULL;
	60	static sc_card_t *card = NULL;
	61	static sc_pkcs15_card_t *p15card = NULL;
	62
	63	static char *sc_pin = NULL;
	64
	65	struct sc_priv_data
	66	{
	67	struct sc_pkcs15_id cert_id;
	68	int ref_count;
	69	};
	70
	71	void
	72	sc_close(void)
	73	{
	74	if (p15card) {
	75	sc_pkcs15_unbind(p15card);
	76	p15card = NULL;
	77	}
	78	if (card) {
	79	sc_disconnect_card(card, 0);
	80	card = NULL;
	81	}
	82	if (ctx) {
	83	sc_release_context(ctx);
	84	ctx = NULL;
	85	}
	86	}
	87
aff51935	88	static int
295c8801	89	sc_init(void)
	90	{
	91	int r;
	92
	93	r = sc_establish_context(&ctx, "openssh");
	94	if (r)
	95	goto err;
d2168412	96	if (sc_reader_id >= ctx->reader_count) {
d2168412	97	r = SC_ERROR_NO_READERS_FOUND;
aff51935	98	error("Illegal reader number %d (max %d)", sc_reader_id,
d2168412	99	ctx->reader_count -1);
	100	goto err;
	101	}
295c8801	102	r = sc_connect_card(ctx->reader[sc_reader_id], 0, &card);
	103	if (r)
	104	goto err;
	105	r = sc_pkcs15_bind(card, &p15card);
	106	if (r)
	107	goto err;
	108	return 0;
	109	err:
	110	sc_close();
	111	return r;
	112	}
	113
	114	/* private key operations */
	115
	116	static int
4e2e1af3	117	sc_prkey_op_init(RSA rsa, struct sc_pkcs15_object *key_obj_out,
4e2e1af3	118	unsigned int usage)
295c8801	119	{
	120	int r;
	121	struct sc_priv_data *priv;
	122	struct sc_pkcs15_object *key_obj;
	123	struct sc_pkcs15_prkey_info *key;
	124	struct sc_pkcs15_object *pin_obj;
	125	struct sc_pkcs15_pin_info *pin;
	126
	127	priv = (struct sc_priv_data *) RSA_get_app_data(rsa);
	128	if (priv == NULL)
	129	return -1;
	130	if (p15card == NULL) {
	131	sc_close();
	132	r = sc_init();
	133	if (r) {
	134	error("SmartCard init failed: %s", sc_strerror(r));
	135	goto err;
	136	}
	137	}
aff51935	138	r = sc_pkcs15_find_prkey_by_id_usage(p15card, &priv->cert_id,
4e2e1af3	139	usage, &key_obj);
295c8801	140	if (r) {
	141	error("Unable to find private key from SmartCard: %s",
	142	sc_strerror(r));
	143	goto err;
	144	}
	145	key = key_obj->data;
	146	r = sc_pkcs15_find_pin_by_auth_id(p15card, &key_obj->auth_id,
	147	&pin_obj);
11f1e60e	148	if (r == SC_ERROR_OBJECT_NOT_FOUND) {
11f1e60e	149	/* no pin required */
7b7f164b	150	r = sc_lock(card);
	151	if (r) {
	152	error("Unable to lock smartcard: %s", sc_strerror(r));
	153	goto err;
	154	}
11f1e60e	155	*key_obj_out = key_obj;
	156	return 0;
	157	} else if (r) {
295c8801	158	error("Unable to find PIN object from SmartCard: %s",
	159	sc_strerror(r));
	160	goto err;
	161	}
	162	pin = pin_obj->data;
	163	r = sc_lock(card);
	164	if (r) {
	165	error("Unable to lock smartcard: %s", sc_strerror(r));
	166	goto err;
	167	}
	168	if (sc_pin != NULL) {
	169	r = sc_pkcs15_verify_pin(p15card, pin, sc_pin,
	170	strlen(sc_pin));
	171	if (r) {
	172	sc_unlock(card);
	173	error("PIN code verification failed: %s",
	174	sc_strerror(r));
	175	goto err;
	176	}
	177	}
	178	*key_obj_out = key_obj;
	179	return 0;
	180	err:
	181	sc_close();
	182	return -1;
	183	}
	184
4e2e1af3	185	#define SC_USAGE_DECRYPT SC_PKCS15_PRKEY_USAGE_DECRYPT \| \
	186	SC_PKCS15_PRKEY_USAGE_UNWRAP
	187
295c8801	188	static int
	189	sc_private_decrypt(int flen, u_char from, u_char to, RSA *rsa,
	190	int padding)
	191	{
	192	struct sc_pkcs15_object *key_obj;
	193	int r;
	194
	195	if (padding != RSA_PKCS1_PADDING)
b6453d99	196	return -1;
4e2e1af3	197	r = sc_prkey_op_init(rsa, &key_obj, SC_USAGE_DECRYPT);
295c8801	198	if (r)
295c8801	199	return -1;
aff51935	200	r = sc_pkcs15_decipher(p15card, key_obj, SC_ALGORITHM_RSA_PAD_PKCS1,
8acdec60	201	from, flen, to, flen);
295c8801	202	sc_unlock(card);
	203	if (r < 0) {
	204	error("sc_pkcs15_decipher() failed: %s", sc_strerror(r));
	205	goto err;
	206	}
	207	return r;
	208	err:
	209	sc_close();
	210	return -1;
	211	}
	212
4e2e1af3	213	#define SC_USAGE_SIGN SC_PKCS15_PRKEY_USAGE_SIGN \| \
	214	SC_PKCS15_PRKEY_USAGE_SIGNRECOVER
	215
295c8801	216	static int
	217	sc_sign(int type, u_char *m, unsigned int m_len,
	218	unsigned char sigret, unsigned int siglen, RSA *rsa)
	219	{
	220	struct sc_pkcs15_object *key_obj;
	221	int r;
	222	unsigned long flags = 0;
	223
4e2e1af3	224	/* XXX: sc_prkey_op_init will search for a pkcs15 private
	225	* key object with the sign or signrecover usage flag set.
	226	* If the signing key has only the non-repudiation flag set
	227	* the key will be rejected as using a non-repudiation key
	228	* for authentication is not recommended. Note: This does not
	229	* prevent the use of a non-repudiation key for authentication
aff51935	230	* if the sign or signrecover flag is set as well.
4e2e1af3	231	*/
4e2e1af3	232	r = sc_prkey_op_init(rsa, &key_obj, SC_USAGE_SIGN);
295c8801	233	if (r)
	234	return -1;
	235	/* FIXME: length of sigret correct? */
	236	/* FIXME: check 'type' and modify flags accordingly */
	237	flags = SC_ALGORITHM_RSA_PAD_PKCS1 \| SC_ALGORITHM_RSA_HASH_SHA1;
	238	r = sc_pkcs15_compute_signature(p15card, key_obj, flags,
	239	m, m_len, sigret, RSA_size(rsa));
	240	sc_unlock(card);
	241	if (r < 0) {
	242	error("sc_pkcs15_compute_signature() failed: %s",
	243	sc_strerror(r));
	244	goto err;
	245	}
	246	*siglen = r;
	247	return 1;
	248	err:
	249	sc_close();
	250	return 0;
	251	}
	252
	253	static int
	254	sc_private_encrypt(int flen, u_char from, u_char to, RSA *rsa,
	255	int padding)
	256	{
	257	error("Private key encryption not supported");
	258	return -1;
	259	}
	260
	261	/* called on free */
	262
	263	static int (orig_finish)(RSA rsa) = NULL;
	264
	265	static int
	266	sc_finish(RSA *rsa)
	267	{
	268	struct sc_priv_data *priv;
	269
	270	priv = RSA_get_app_data(rsa);
	271	priv->ref_count--;
	272	if (priv->ref_count == 0) {
	273	free(priv);
	274	sc_close();
	275	}
	276	if (orig_finish)
	277	orig_finish(rsa);
	278	return 1;
	279	}
	280
	281	/* engine for overloading private key operations */
	282
	283	static RSA_METHOD *
	284	sc_get_rsa_method(void)
	285	{
	286	static RSA_METHOD smart_rsa;
	287	const RSA_METHOD *def = RSA_get_default_method();
	288
	289	/* use the OpenSSL version */
	290	memcpy(&smart_rsa, def, sizeof(smart_rsa));
	291
	292	smart_rsa.name = "opensc";
	293
	294	/* overload */
	295	smart_rsa.rsa_priv_enc = sc_private_encrypt;
	296	smart_rsa.rsa_priv_dec = sc_private_decrypt;
297	smart_rsa.rsa_sign = sc_sign;
298
299	/* save original */
300	orig_finish = def->finish;
301	smart_rsa.finish = sc_finish;
302
303	return &smart_rsa;
304	}
305
306	#ifdef USE_ENGINE
307	static ENGINE *
308	sc_get_engine(void)
309	{
310	static ENGINE *smart_engine = NULL;
311
312	if ((smart_engine = ENGINE_new()) == NULL)
313	fatal("ENGINE_new failed");
314
315	ENGINE_set_id(smart_engine, "opensc");
316	ENGINE_set_name(smart_engine, "OpenSC");
317
318	ENGINE_set_RSA(smart_engine, sc_get_rsa_method());
319	ENGINE_set_DSA(smart_engine, DSA_get_default_openssl_method());
320	ENGINE_set_DH(smart_engine, DH_get_default_openssl_method());
321	ENGINE_set_RAND(smart_engine, RAND_SSLeay());
322	ENGINE_set_BN_mod_exp(smart_engine, BN_mod_exp);
323
324	return smart_engine;
325	}
326	#endif
327
328	static void
329	convert_rsa_to_rsa1(Key * in, Key * out)
330	{
331	struct sc_priv_data *priv;
b6453d99	332
295c8801	333	out->rsa->flags = in->rsa->flags;
	334	out->flags = in->flags;
	335	RSA_set_method(out->rsa, RSA_get_method(in->rsa));
	336	BN_copy(out->rsa->n, in->rsa->n);
	337	BN_copy(out->rsa->e, in->rsa->e);
	338	priv = RSA_get_app_data(in->rsa);
	339	priv->ref_count++;
	340	RSA_set_app_data(out->rsa, priv);
	341	return;
	342	}
	343
aff51935	344	static int
295c8801	345	sc_read_pubkey(Key * k, const struct sc_pkcs15_object *cert_obj)
	346	{
	347	int r;
	348	sc_pkcs15_cert_t *cert = NULL;
	349	struct sc_priv_data *priv = NULL;
	350	sc_pkcs15_cert_info_t *cinfo = cert_obj->data;
	351
	352	X509 *x509 = NULL;
	353	EVP_PKEY *pubkey = NULL;
	354	u8 *p;
	355	char *tmp;
b6453d99	356
295c8801	357	debug("sc_read_pubkey() with cert id %02X", cinfo->id.value[0]);
	358	r = sc_pkcs15_read_certificate(p15card, cinfo, &cert);
	359	if (r) {
bbe88b6d	360	logit("Certificate read failed: %s", sc_strerror(r));
295c8801	361	goto err;
	362	}
	363	x509 = X509_new();
	364	if (x509 == NULL) {
aff51935	365	r = -1;
295c8801	366	goto err;
	367	}
	368	p = cert->data;
	369	if (!d2i_X509(&x509, &p, cert->data_len)) {
bbe88b6d	370	logit("Unable to parse X.509 certificate");
295c8801	371	r = -1;
	372	goto err;
	373	}
	374	sc_pkcs15_free_certificate(cert);
	375	cert = NULL;
	376	pubkey = X509_get_pubkey(x509);
	377	X509_free(x509);
	378	x509 = NULL;
	379	if (pubkey->type != EVP_PKEY_RSA) {
bbe88b6d	380	logit("Public key is of unknown type");
295c8801	381	r = -1;
	382	goto err;
	383	}
	384	k->rsa = EVP_PKEY_get1_RSA(pubkey);
	385	EVP_PKEY_free(pubkey);
	386
	387	k->rsa->flags \|= RSA_FLAG_SIGN_VER;
	388	RSA_set_method(k->rsa, sc_get_rsa_method());
	389	priv = xmalloc(sizeof(struct sc_priv_data));
	390	priv->cert_id = cinfo->id;
	391	priv->ref_count = 1;
	392	RSA_set_app_data(k->rsa, priv);
	393
	394	k->flags = KEY_FLAG_EXT;
	395	tmp = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
	396	debug("fingerprint %d %s", key_size(k), tmp);
	397	xfree(tmp);
b6453d99	398
295c8801	399	return 0;
	400	err:
	401	if (cert)
	402	sc_pkcs15_free_certificate(cert);
	403	if (pubkey)
	404	EVP_PKEY_free(pubkey);
	405	if (x509)
	406	X509_free(x509);
	407	return r;
	408	}
	409
	410	Key **
	411	sc_get_keys(const char id, const char pin)
	412	{
	413	Key k, *keys;
	414	int i, r, real_count = 0, key_count;
	415	sc_pkcs15_id_t cert_id;
	416	sc_pkcs15_object_t *certs[32];
	417	char buf = xstrdup(id), p;
	418
	419	debug("sc_get_keys called: id = %s", id);
	420
	421	if (sc_pin != NULL)
	422	xfree(sc_pin);
	423	sc_pin = (pin == NULL) ? NULL : xstrdup(pin);
	424
	425	cert_id.len = 0;
	426	if ((p = strchr(buf, ':')) != NULL) {
	427	*p = 0;
	428	p++;
	429	sc_pkcs15_hex_string_to_id(p, &cert_id);
	430	}
	431	r = sscanf(buf, "%d", &sc_reader_id);
	432	xfree(buf);
	433	if (r != 1)
	434	goto err;
	435	if (p15card == NULL) {
	436	sc_close();
	437	r = sc_init();
	438	if (r) {
	439	error("Smartcard init failed: %s", sc_strerror(r));
	440	goto err;
	441	}
	442	}
	443	if (cert_id.len) {
	444	r = sc_pkcs15_find_cert_by_id(p15card, &cert_id, &certs[0]);
	445	if (r < 0)
	446	goto err;
	447	key_count = 1;
	448	} else {
	449	r = sc_pkcs15_get_objects(p15card, SC_PKCS15_TYPE_CERT_X509,
	450	certs, 32);
	451	if (r == 0) {
bbe88b6d	452	logit("No certificates found on smartcard");
295c8801	453	r = -1;
	454	goto err;
	455	} else if (r < 0) {
	456	error("Certificate enumeration failed: %s",
	457	sc_strerror(r));
	458	goto err;
	459	}
	460	key_count = r;
	461	}
01d35895	462	if (key_count > 1024)
	463	fatal("Too many keys (%u), expected <= 1024", key_count);
	464	keys = xcalloc(key_count * 2 + 1, sizeof(Key *));
295c8801	465	for (i = 0; i < key_count; i++) {
7b7f164b	466	sc_pkcs15_object_t *tmp_obj = NULL;
	467	cert_id = ((sc_pkcs15_cert_info_t *)(certs[i]->data))->id;
	468	if (sc_pkcs15_find_prkey_by_id(p15card, &cert_id, &tmp_obj))
	469	/* skip the public key (certificate) if no
	470	* corresponding private key is present */
	471	continue;
295c8801	472	k = key_new(KEY_RSA);
	473	if (k == NULL)
	474	break;
	475	r = sc_read_pubkey(k, certs[i]);
	476	if (r) {
	477	error("sc_read_pubkey failed: %s", sc_strerror(r));
	478	key_free(k);
	479	continue;
	480	}
	481	keys[real_count] = k;
	482	real_count++;
	483	k = key_new(KEY_RSA1);
	484	if (k == NULL)
	485	break;
	486	convert_rsa_to_rsa1(keys[real_count-1], k);
	487	keys[real_count] = k;
	488	real_count++;
	489	}
	490	keys[real_count] = NULL;
	491
	492	return keys;
	493	err:
	494	sc_close();
	495	return NULL;
	496	}
	497
	498	int
	499	sc_put_key(Key prv, const char id)
	500	{
	501	error("key uploading not yet supported");
	502	return -1;
	503	}
	504
9ea150a7	505	char *
	506	sc_get_key_label(Key *key)
	507	{
	508	int r;
	509	const struct sc_priv_data *priv;
	510	struct sc_pkcs15_object *key_obj;
	511
	512	priv = (const struct sc_priv_data *) RSA_get_app_data(key->rsa);
	513	if (priv == NULL \|\| p15card == NULL) {
	514	logit("SmartCard key not loaded");
	515	/* internal error => return default label */
	516	return xstrdup("smartcard key");
	517	}
	518	r = sc_pkcs15_find_prkey_by_id(p15card, &priv->cert_id, &key_obj);
	519	if (r) {
	520	logit("Unable to find private key from SmartCard: %s",
	521	sc_strerror(r));
	522	return xstrdup("smartcard key");
	523	}
	524	if (key_obj == NULL \|\| key_obj->label == NULL)
	525	/* the optional PKCS#15 label does not exists
	526	* => return the default label */
	527	return xstrdup("smartcard key");
	528	return xstrdup(key_obj->label);
	529	}
	530
295c8801	531	#endif /* SMARTCARD */