[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 <string.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>
fce809d2	35	#include <string.h>
24436b92	36
46c8e0f6	37	#include <opensc/opensc.h>
46c8e0f6	38	#include <opensc/pkcs15.h>
295c8801	39
	40	#include "key.h"
	41	#include "log.h"
	42	#include "xmalloc.h"
0f3ee929	43	#include "misc.h"
295c8801	44	#include "scard.h"
295c8801	45
5866adb0	46	#if OPENSSL_VERSION_NUMBER < 0x00907000L && defined(CRYPTO_LOCK_ENGINE)
295c8801	47	#define USE_ENGINE
	48	#define RSA_get_default_method RSA_get_default_openssl_method
	49	#else
	50	#endif
	51
	52	#ifdef USE_ENGINE
	53	#include <openssl/engine.h>
	54	#define sc_get_rsa sc_get_engine
	55	#else
	56	#define sc_get_rsa sc_get_rsa_method
	57	#endif
	58
	59	static int sc_reader_id;
	60	static sc_context_t *ctx = NULL;
	61	static sc_card_t *card = NULL;
	62	static sc_pkcs15_card_t *p15card = NULL;
	63
	64	static char *sc_pin = NULL;
	65
	66	struct sc_priv_data
	67	{
	68	struct sc_pkcs15_id cert_id;
	69	int ref_count;
	70	};
	71
	72	void
	73	sc_close(void)
	74	{
	75	if (p15card) {
	76	sc_pkcs15_unbind(p15card);
	77	p15card = NULL;
	78	}
	79	if (card) {
	80	sc_disconnect_card(card, 0);
	81	card = NULL;
	82	}
	83	if (ctx) {
	84	sc_release_context(ctx);
	85	ctx = NULL;
	86	}
	87	}
	88
aff51935	89	static int
295c8801	90	sc_init(void)
	91	{
	92	int r;
	93
	94	r = sc_establish_context(&ctx, "openssh");
	95	if (r)
	96	goto err;
d2168412	97	if (sc_reader_id >= ctx->reader_count) {
d2168412	98	r = SC_ERROR_NO_READERS_FOUND;
aff51935	99	error("Illegal reader number %d (max %d)", sc_reader_id,
d2168412	100	ctx->reader_count -1);
	101	goto err;
	102	}
295c8801	103	r = sc_connect_card(ctx->reader[sc_reader_id], 0, &card);
	104	if (r)
	105	goto err;
	106	r = sc_pkcs15_bind(card, &p15card);
	107	if (r)
	108	goto err;
	109	return 0;
	110	err:
	111	sc_close();
	112	return r;
	113	}
	114
	115	/* private key operations */
	116
	117	static int
4e2e1af3	118	sc_prkey_op_init(RSA rsa, struct sc_pkcs15_object *key_obj_out,
4e2e1af3	119	unsigned int usage)
295c8801	120	{
	121	int r;
	122	struct sc_priv_data *priv;
	123	struct sc_pkcs15_object *key_obj;
	124	struct sc_pkcs15_prkey_info *key;
	125	struct sc_pkcs15_object *pin_obj;
	126	struct sc_pkcs15_pin_info *pin;
	127
	128	priv = (struct sc_priv_data *) RSA_get_app_data(rsa);
	129	if (priv == NULL)
	130	return -1;
	131	if (p15card == NULL) {
	132	sc_close();
	133	r = sc_init();
	134	if (r) {
	135	error("SmartCard init failed: %s", sc_strerror(r));
	136	goto err;
	137	}
	138	}
aff51935	139	r = sc_pkcs15_find_prkey_by_id_usage(p15card, &priv->cert_id,
4e2e1af3	140	usage, &key_obj);
295c8801	141	if (r) {
	142	error("Unable to find private key from SmartCard: %s",
	143	sc_strerror(r));
	144	goto err;
	145	}
	146	key = key_obj->data;
	147	r = sc_pkcs15_find_pin_by_auth_id(p15card, &key_obj->auth_id,
	148	&pin_obj);
11f1e60e	149	if (r == SC_ERROR_OBJECT_NOT_FOUND) {
11f1e60e	150	/* no pin required */
7b7f164b	151	r = sc_lock(card);
	152	if (r) {
	153	error("Unable to lock smartcard: %s", sc_strerror(r));
	154	goto err;
	155	}
11f1e60e	156	*key_obj_out = key_obj;
	157	return 0;
	158	} else if (r) {
295c8801	159	error("Unable to find PIN object from SmartCard: %s",
	160	sc_strerror(r));
	161	goto err;
	162	}
	163	pin = pin_obj->data;
	164	r = sc_lock(card);
	165	if (r) {
	166	error("Unable to lock smartcard: %s", sc_strerror(r));
	167	goto err;
	168	}
	169	if (sc_pin != NULL) {
	170	r = sc_pkcs15_verify_pin(p15card, pin, sc_pin,
	171	strlen(sc_pin));
	172	if (r) {
	173	sc_unlock(card);
	174	error("PIN code verification failed: %s",
	175	sc_strerror(r));
	176	goto err;
	177	}
	178	}
	179	*key_obj_out = key_obj;
	180	return 0;
	181	err:
	182	sc_close();
	183	return -1;
	184	}
	185
4e2e1af3	186	#define SC_USAGE_DECRYPT SC_PKCS15_PRKEY_USAGE_DECRYPT \| \
	187	SC_PKCS15_PRKEY_USAGE_UNWRAP
	188
295c8801	189	static int
	190	sc_private_decrypt(int flen, u_char from, u_char to, RSA *rsa,
	191	int padding)
	192	{
	193	struct sc_pkcs15_object *key_obj;
	194	int r;
	195
	196	if (padding != RSA_PKCS1_PADDING)
b6453d99	197	return -1;
4e2e1af3	198	r = sc_prkey_op_init(rsa, &key_obj, SC_USAGE_DECRYPT);
295c8801	199	if (r)
295c8801	200	return -1;
aff51935	201	r = sc_pkcs15_decipher(p15card, key_obj, SC_ALGORITHM_RSA_PAD_PKCS1,
8acdec60	202	from, flen, to, flen);
295c8801	203	sc_unlock(card);
	204	if (r < 0) {
	205	error("sc_pkcs15_decipher() failed: %s", sc_strerror(r));
	206	goto err;
	207	}
	208	return r;
	209	err:
	210	sc_close();
	211	return -1;
	212	}
	213
4e2e1af3	214	#define SC_USAGE_SIGN SC_PKCS15_PRKEY_USAGE_SIGN \| \
	215	SC_PKCS15_PRKEY_USAGE_SIGNRECOVER
	216
295c8801	217	static int
	218	sc_sign(int type, u_char *m, unsigned int m_len,
	219	unsigned char sigret, unsigned int siglen, RSA *rsa)
	220	{
	221	struct sc_pkcs15_object *key_obj;
	222	int r;
	223	unsigned long flags = 0;
	224
4e2e1af3	225	/* XXX: sc_prkey_op_init will search for a pkcs15 private
	226	* key object with the sign or signrecover usage flag set.
	227	* If the signing key has only the non-repudiation flag set
	228	* the key will be rejected as using a non-repudiation key
	229	* for authentication is not recommended. Note: This does not
	230	* prevent the use of a non-repudiation key for authentication
aff51935	231	* if the sign or signrecover flag is set as well.
4e2e1af3	232	*/
4e2e1af3	233	r = sc_prkey_op_init(rsa, &key_obj, SC_USAGE_SIGN);
295c8801	234	if (r)
	235	return -1;
	236	/* FIXME: length of sigret correct? */
	237	/* FIXME: check 'type' and modify flags accordingly */
	238	flags = SC_ALGORITHM_RSA_PAD_PKCS1 \| SC_ALGORITHM_RSA_HASH_SHA1;
	239	r = sc_pkcs15_compute_signature(p15card, key_obj, flags,
	240	m, m_len, sigret, RSA_size(rsa));
	241	sc_unlock(card);
	242	if (r < 0) {
	243	error("sc_pkcs15_compute_signature() failed: %s",
	244	sc_strerror(r));
	245	goto err;
	246	}
	247	*siglen = r;
	248	return 1;
	249	err:
	250	sc_close();
	251	return 0;
	252	}
	253
	254	static int
	255	sc_private_encrypt(int flen, u_char from, u_char to, RSA *rsa,
	256	int padding)
	257	{
	258	error("Private key encryption not supported");
	259	return -1;
	260	}
	261
	262	/* called on free */
	263
	264	static int (orig_finish)(RSA rsa) = NULL;
	265
	266	static int
	267	sc_finish(RSA *rsa)
	268	{
	269	struct sc_priv_data *priv;
	270
	271	priv = RSA_get_app_data(rsa);
	272	priv->ref_count--;
	273	if (priv->ref_count == 0) {
	274	free(priv);
	275	sc_close();
	276	}
	277	if (orig_finish)
	278	orig_finish(rsa);
	279	return 1;
	280	}
	281
	282	/* engine for overloading private key operations */
	283
	284	static RSA_METHOD *
	285	sc_get_rsa_method(void)
	286	{
	287	static RSA_METHOD smart_rsa;
	288	const RSA_METHOD *def = RSA_get_default_method();
	289
	290	/* use the OpenSSL version */
	291	memcpy(&smart_rsa, def, sizeof(smart_rsa));
	292
	293	smart_rsa.name = "opensc";
	294
	295	/* overload */
	296	smart_rsa.rsa_priv_enc = sc_private_encrypt;
	297	smart_rsa.rsa_priv_dec = sc_private_decrypt;
298	smart_rsa.rsa_sign = sc_sign;
299
300	/* save original */
301	orig_finish = def->finish;
302	smart_rsa.finish = sc_finish;
303
304	return &smart_rsa;
305	}
306
307	#ifdef USE_ENGINE
308	static ENGINE *
309	sc_get_engine(void)
310	{
311	static ENGINE *smart_engine = NULL;
312
313	if ((smart_engine = ENGINE_new()) == NULL)
314	fatal("ENGINE_new failed");
315
316	ENGINE_set_id(smart_engine, "opensc");
317	ENGINE_set_name(smart_engine, "OpenSC");
318
319	ENGINE_set_RSA(smart_engine, sc_get_rsa_method());
320	ENGINE_set_DSA(smart_engine, DSA_get_default_openssl_method());
321	ENGINE_set_DH(smart_engine, DH_get_default_openssl_method());
322	ENGINE_set_RAND(smart_engine, RAND_SSLeay());
323	ENGINE_set_BN_mod_exp(smart_engine, BN_mod_exp);
324
325	return smart_engine;
326	}
327	#endif
328
329	static void
330	convert_rsa_to_rsa1(Key * in, Key * out)
331	{
332	struct sc_priv_data *priv;
b6453d99	333
295c8801	334	out->rsa->flags = in->rsa->flags;
	335	out->flags = in->flags;
	336	RSA_set_method(out->rsa, RSA_get_method(in->rsa));
	337	BN_copy(out->rsa->n, in->rsa->n);
	338	BN_copy(out->rsa->e, in->rsa->e);
	339	priv = RSA_get_app_data(in->rsa);
	340	priv->ref_count++;
	341	RSA_set_app_data(out->rsa, priv);
	342	return;
	343	}
	344
aff51935	345	static int
295c8801	346	sc_read_pubkey(Key * k, const struct sc_pkcs15_object *cert_obj)
	347	{
	348	int r;
	349	sc_pkcs15_cert_t *cert = NULL;
	350	struct sc_priv_data *priv = NULL;
	351	sc_pkcs15_cert_info_t *cinfo = cert_obj->data;
	352
	353	X509 *x509 = NULL;
	354	EVP_PKEY *pubkey = NULL;
	355	u8 *p;
	356	char *tmp;
b6453d99	357
295c8801	358	debug("sc_read_pubkey() with cert id %02X", cinfo->id.value[0]);
	359	r = sc_pkcs15_read_certificate(p15card, cinfo, &cert);
	360	if (r) {
bbe88b6d	361	logit("Certificate read failed: %s", sc_strerror(r));
295c8801	362	goto err;
	363	}
	364	x509 = X509_new();
	365	if (x509 == NULL) {
aff51935	366	r = -1;
295c8801	367	goto err;
	368	}
	369	p = cert->data;
	370	if (!d2i_X509(&x509, &p, cert->data_len)) {
bbe88b6d	371	logit("Unable to parse X.509 certificate");
295c8801	372	r = -1;
	373	goto err;
	374	}
	375	sc_pkcs15_free_certificate(cert);
	376	cert = NULL;
	377	pubkey = X509_get_pubkey(x509);
	378	X509_free(x509);
	379	x509 = NULL;
	380	if (pubkey->type != EVP_PKEY_RSA) {
bbe88b6d	381	logit("Public key is of unknown type");
295c8801	382	r = -1;
	383	goto err;
	384	}
	385	k->rsa = EVP_PKEY_get1_RSA(pubkey);
	386	EVP_PKEY_free(pubkey);
	387
	388	k->rsa->flags \|= RSA_FLAG_SIGN_VER;
	389	RSA_set_method(k->rsa, sc_get_rsa_method());
	390	priv = xmalloc(sizeof(struct sc_priv_data));
	391	priv->cert_id = cinfo->id;
	392	priv->ref_count = 1;
	393	RSA_set_app_data(k->rsa, priv);
	394
	395	k->flags = KEY_FLAG_EXT;
	396	tmp = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
	397	debug("fingerprint %d %s", key_size(k), tmp);
	398	xfree(tmp);
b6453d99	399
295c8801	400	return 0;
	401	err:
	402	if (cert)
	403	sc_pkcs15_free_certificate(cert);
	404	if (pubkey)
	405	EVP_PKEY_free(pubkey);
	406	if (x509)
	407	X509_free(x509);
	408	return r;
	409	}
	410
	411	Key **
	412	sc_get_keys(const char id, const char pin)
	413	{
	414	Key k, *keys;
	415	int i, r, real_count = 0, key_count;
	416	sc_pkcs15_id_t cert_id;
	417	sc_pkcs15_object_t *certs[32];
	418	char buf = xstrdup(id), p;
	419
	420	debug("sc_get_keys called: id = %s", id);
	421
	422	if (sc_pin != NULL)
	423	xfree(sc_pin);
	424	sc_pin = (pin == NULL) ? NULL : xstrdup(pin);
	425
	426	cert_id.len = 0;
	427	if ((p = strchr(buf, ':')) != NULL) {
	428	*p = 0;
	429	p++;
	430	sc_pkcs15_hex_string_to_id(p, &cert_id);
	431	}
	432	r = sscanf(buf, "%d", &sc_reader_id);
	433	xfree(buf);
	434	if (r != 1)
	435	goto err;
	436	if (p15card == NULL) {
	437	sc_close();
	438	r = sc_init();
	439	if (r) {
	440	error("Smartcard init failed: %s", sc_strerror(r));
	441	goto err;
	442	}
	443	}
	444	if (cert_id.len) {
	445	r = sc_pkcs15_find_cert_by_id(p15card, &cert_id, &certs[0]);
	446	if (r < 0)
	447	goto err;
	448	key_count = 1;
	449	} else {
	450	r = sc_pkcs15_get_objects(p15card, SC_PKCS15_TYPE_CERT_X509,
	451	certs, 32);
	452	if (r == 0) {
bbe88b6d	453	logit("No certificates found on smartcard");
295c8801	454	r = -1;
	455	goto err;
	456	} else if (r < 0) {
	457	error("Certificate enumeration failed: %s",
	458	sc_strerror(r));
	459	goto err;
	460	}
	461	key_count = r;
	462	}
01d35895	463	if (key_count > 1024)
	464	fatal("Too many keys (%u), expected <= 1024", key_count);
	465	keys = xcalloc(key_count * 2 + 1, sizeof(Key *));
295c8801	466	for (i = 0; i < key_count; i++) {
7b7f164b	467	sc_pkcs15_object_t *tmp_obj = NULL;
	468	cert_id = ((sc_pkcs15_cert_info_t *)(certs[i]->data))->id;
	469	if (sc_pkcs15_find_prkey_by_id(p15card, &cert_id, &tmp_obj))
	470	/* skip the public key (certificate) if no
	471	* corresponding private key is present */
	472	continue;
295c8801	473	k = key_new(KEY_RSA);
	474	if (k == NULL)
	475	break;
	476	r = sc_read_pubkey(k, certs[i]);
	477	if (r) {
	478	error("sc_read_pubkey failed: %s", sc_strerror(r));
	479	key_free(k);
	480	continue;
	481	}
	482	keys[real_count] = k;
	483	real_count++;
	484	k = key_new(KEY_RSA1);
	485	if (k == NULL)
	486	break;
	487	convert_rsa_to_rsa1(keys[real_count-1], k);
	488	keys[real_count] = k;
	489	real_count++;
	490	}
	491	keys[real_count] = NULL;
	492
	493	return keys;
	494	err:
	495	sc_close();
	496	return NULL;
	497	}
	498
	499	int
	500	sc_put_key(Key prv, const char id)
	501	{
	502	error("key uploading not yet supported");
	503	return -1;
	504	}
	505
9ea150a7	506	char *
	507	sc_get_key_label(Key *key)
	508	{
	509	int r;
	510	const struct sc_priv_data *priv;
	511	struct sc_pkcs15_object *key_obj;
	512
	513	priv = (const struct sc_priv_data *) RSA_get_app_data(key->rsa);
	514	if (priv == NULL \|\| p15card == NULL) {
	515	logit("SmartCard key not loaded");
	516	/* internal error => return default label */
	517	return xstrdup("smartcard key");
	518	}
	519	r = sc_pkcs15_find_prkey_by_id(p15card, &priv->cert_id, &key_obj);
	520	if (r) {
	521	logit("Unable to find private key from SmartCard: %s",
	522	sc_strerror(r));
	523	return xstrdup("smartcard key");
	524	}
	525	if (key_obj == NULL \|\| key_obj->label == NULL)
	526	/* the optional PKCS#15 label does not exists
	527	* => return the default label */
	528	return xstrdup("smartcard key");
	529	return xstrdup(key_obj->label);
	530	}
	531
295c8801	532	#endif /* SMARTCARD */