[openssh.git] / scard.c

/* $OpenBSD: scard.c,v 1.35 2006/08/03 03:34:42 deraadt Exp $ */
/*
 * Copyright (c) 2001 Markus Friedl.  All rights reserved.
 *
 * 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_SECTOK)

#include <sys/types.h>

#include <sectok.h>
#include <string.h>

#include <openssl/evp.h>

#include "xmalloc.h"
#include "key.h"
#include "log.h"
#include "misc.h"
#include "scard.h"

#if OPENSSL_VERSION_NUMBER < 0x00907000L
#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

#define CLA_SSH 0x05
#define INS_DECRYPT 0x10
#define INS_GET_KEYLENGTH 0x20
#define INS_GET_PUBKEY 0x30
#define INS_GET_RESPONSE 0xc0

#define MAX_BUF_SIZE 256

u_char DEFAUT0[] = {0xad, 0x9f, 0x61, 0xfe, 0xfa, 0x20, 0xce, 0x63};

static int sc_fd = -1;
static char *sc_reader_id = NULL;
static char *sc_pin = NULL;
static int cla = 0x00;	/* class */

static void sc_mk_digest(const char *pin, u_char *digest);
static int get_AUT0(u_char *aut0);
static int try_AUT0(void);

/* interface to libsectok */

static int
sc_open(void)
{
	int sw;

	if (sc_fd >= 0)
		return sc_fd;

	sc_fd = sectok_friendly_open(sc_reader_id, STONOWAIT, &sw);
	if (sc_fd < 0) {
		error("sectok_open failed: %s", sectok_get_sw(sw));
		return SCARD_ERROR_FAIL;
	}
	if (! sectok_cardpresent(sc_fd)) {
		debug("smartcard in reader %s not present, skipping",
		    sc_reader_id);
		sc_close();
		return SCARD_ERROR_NOCARD;
	}
	if (sectok_reset(sc_fd, 0, NULL, &sw) <= 0) {
		error("sectok_reset failed: %s", sectok_get_sw(sw));
		sc_fd = -1;
		return SCARD_ERROR_FAIL;
	}
	if ((cla = cyberflex_inq_class(sc_fd)) < 0)
		cla = 0;

	debug("sc_open ok %d", sc_fd);
	return sc_fd;
}

static int
sc_enable_applet(void)
{
	static u_char aid[] = {0xfc, 0x53, 0x73, 0x68, 0x2e, 0x62, 0x69, 0x6e};
	int sw = 0;

	/* select applet id */
	sectok_apdu(sc_fd, cla, 0xa4, 0x04, 0, sizeof aid, aid, 0, NULL, &sw);
	if (!sectok_swOK(sw)) {
		error("sectok_apdu failed: %s", sectok_get_sw(sw));
		sc_close();
		return -1;
	}
	return 0;
}

static int
sc_init(void)
{
	int status;

	status = sc_open();
	if (status == SCARD_ERROR_NOCARD) {
		return SCARD_ERROR_NOCARD;
	}
	if (status < 0) {
		error("sc_open failed");
		return status;
	}
	if (sc_enable_applet() < 0) {
		error("sc_enable_applet failed");
		return SCARD_ERROR_APPLET;
	}
	return 0;
}

static int
sc_read_pubkey(Key * k)
{
	u_char buf[2], *n;
	char *p;
	int len, sw, status = -1;

	len = sw = 0;
	n = NULL;

	if (sc_fd < 0) {
		if (sc_init() < 0)
			goto err;
	}

	/* get key size */
	sectok_apdu(sc_fd, CLA_SSH, INS_GET_KEYLENGTH, 0, 0, 0, NULL,
	    sizeof(buf), buf, &sw);
	if (!sectok_swOK(sw)) {
		error("could not obtain key length: %s", sectok_get_sw(sw));
		goto err;
	}
	len = (buf[0] << 8) | buf[1];
	len /= 8;
	debug("INS_GET_KEYLENGTH: len %d sw %s", len, sectok_get_sw(sw));

	n = xmalloc(len);
	/* get n */
	sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);

	if (sw == 0x6982) {
		if (try_AUT0() < 0)
			goto err;
		sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
	}
	if (!sectok_swOK(sw)) {
		error("could not obtain public key: %s", sectok_get_sw(sw));
		goto err;
	}

	debug("INS_GET_KEYLENGTH: sw %s", sectok_get_sw(sw));

	if (BN_bin2bn(n, len, k->rsa->n) == NULL) {
		error("c_read_pubkey: BN_bin2bn failed");
		goto err;
	}

	/* currently the java applet just stores 'n' */
	if (!BN_set_word(k->rsa->e, 35)) {
		error("c_read_pubkey: BN_set_word(e, 35) failed");
		goto err;
	}

	status = 0;
	p = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
	debug("fingerprint %u %s", key_size(k), p);
	xfree(p);

err:
	if (n != NULL)
		xfree(n);
	sc_close();
	return status;
}

/* private key operations */

static int
sc_private_decrypt(int flen, u_char *from, u_char *to, RSA *rsa,
    int padding)
{
	u_char *padded = NULL;
	int sw, len, olen, status = -1;

	debug("sc_private_decrypt called");

	olen = len = sw = 0;
	if (sc_fd < 0) {
		status = sc_init();
		if (status < 0)
			goto err;
	}
	if (padding != RSA_PKCS1_PADDING)
		goto err;

	len = BN_num_bytes(rsa->n);
	padded = xmalloc(len);

	sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, len, padded, &sw);

	if (sw == 0x6982) {
		if (try_AUT0() < 0)
			goto err;
		sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, len, padded, &sw);
	}
	if (!sectok_swOK(sw)) {
		error("sc_private_decrypt: INS_DECRYPT failed: %s",
		    sectok_get_sw(sw));
		goto err;
	}
	olen = RSA_padding_check_PKCS1_type_2(to, len, padded + 1, len - 1,
	    len);
err:
	if (padded)
		xfree(padded);
	sc_close();
	return (olen >= 0 ? olen : status);
}

static int
sc_private_encrypt(int flen, u_char *from, u_char *to, RSA *rsa,
    int padding)
{
	u_char *padded = NULL;
	int sw, len, status = -1;

	len = sw = 0;
	if (sc_fd < 0) {
		status = sc_init();
		if (status < 0)
			goto err;
	}
	if (padding != RSA_PKCS1_PADDING)
		goto err;

	debug("sc_private_encrypt called");
	len = BN_num_bytes(rsa->n);
	padded = xmalloc(len);

	if (RSA_padding_add_PKCS1_type_1(padded, len, (u_char *)from, flen) <= 0) {
		error("RSA_padding_add_PKCS1_type_1 failed");
		goto err;
	}
	sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, len, to, &sw);
	if (sw == 0x6982) {
		if (try_AUT0() < 0)
			goto err;
		sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, len, to, &sw);
	}
	if (!sectok_swOK(sw)) {
		error("sc_private_encrypt: INS_DECRYPT failed: %s",
		    sectok_get_sw(sw));
		goto err;
	}
err:
	if (padded)
		xfree(padded);
	sc_close();
	return (len >= 0 ? len : status);
}

/* called on free */

static int (*orig_finish)(RSA *rsa) = NULL;

static int
sc_finish(RSA *rsa)
{
	if (orig_finish)
		orig_finish(rsa);
	sc_close();
	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		= "sectok";

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

	/* 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, "sectok");
	ENGINE_set_name(smart_engine, "libsectok");

	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

void
sc_close(void)
{
	if (sc_fd >= 0) {
		sectok_close(sc_fd);
		sc_fd = -1;
	}
}

Key **
sc_get_keys(const char *id, const char *pin)
{
	Key *k, *n, **keys;
	int status, nkeys = 2;

	if (sc_reader_id != NULL)
		xfree(sc_reader_id);
	sc_reader_id = xstrdup(id);

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

	k = key_new(KEY_RSA);
	if (k == NULL) {
		return NULL;
	}
	status = sc_read_pubkey(k);
	if (status == SCARD_ERROR_NOCARD) {
		key_free(k);
		return NULL;
	}
	if (status < 0) {
		error("sc_read_pubkey failed");
		key_free(k);
		return NULL;
	}
	keys = xcalloc((nkeys+1), sizeof(Key *));

	n = key_new(KEY_RSA1);
	BN_copy(n->rsa->n, k->rsa->n);
	BN_copy(n->rsa->e, k->rsa->e);
	RSA_set_method(n->rsa, sc_get_rsa());
	n->flags |= KEY_FLAG_EXT;
	keys[0] = n;

	n = key_new(KEY_RSA);
	BN_copy(n->rsa->n, k->rsa->n);
	BN_copy(n->rsa->e, k->rsa->e);
	RSA_set_method(n->rsa, sc_get_rsa());
	n->flags |= KEY_FLAG_EXT;
	keys[1] = n;

	keys[2] = NULL;

	key_free(k);
	return keys;
}

#define NUM_RSA_KEY_ELEMENTS 5+1
#define COPY_RSA_KEY(x, i) \
	do { \
		len = BN_num_bytes(prv->rsa->x); \
		elements[i] = xmalloc(len); \
		debug("#bytes %d", len); \
		if (BN_bn2bin(prv->rsa->x, elements[i]) < 0) \
			goto done; \
	} while (0)

static void
sc_mk_digest(const char *pin, u_char *digest)
{
	const EVP_MD *evp_md = EVP_sha1();
	EVP_MD_CTX md;

	EVP_DigestInit(&md, evp_md);
	EVP_DigestUpdate(&md, pin, strlen(pin));
	EVP_DigestFinal(&md, digest, NULL);
}

static int
get_AUT0(u_char *aut0)
{
	char *pass;

	pass = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN);
	if (pass == NULL)
		return -1;
	if (!strcmp(pass, "-")) {
		memcpy(aut0, DEFAUT0, sizeof DEFAUT0);
		return 0;
	}
	sc_mk_digest(pass, aut0);
	memset(pass, 0, strlen(pass));
	xfree(pass);
	return 0;
}

static int
try_AUT0(void)
{
	u_char aut0[EVP_MAX_MD_SIZE];

	/* permission denied; try PIN if provided */
	if (sc_pin && strlen(sc_pin) > 0) {
		sc_mk_digest(sc_pin, aut0);
		if (cyberflex_verify_AUT0(sc_fd, cla, aut0, 8) < 0) {
			error("smartcard passphrase incorrect");
			return (-1);
		}
	} else {
		/* try default AUT0 key */
		if (cyberflex_verify_AUT0(sc_fd, cla, DEFAUT0, 8) < 0) {
			/* default AUT0 key failed; prompt for passphrase */
			if (get_AUT0(aut0) < 0 ||
			    cyberflex_verify_AUT0(sc_fd, cla, aut0, 8) < 0) {
				error("smartcard passphrase incorrect");
				return (-1);
			}
		}
	}
	return (0);
}

int
sc_put_key(Key *prv, const char *id)
{
	u_char *elements[NUM_RSA_KEY_ELEMENTS];
	u_char key_fid[2];
	u_char AUT0[EVP_MAX_MD_SIZE];
	int len, status = -1, i, fd = -1, ret;
	int sw = 0, cla = 0x00;

	for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++)
		elements[i] = NULL;

	COPY_RSA_KEY(q, 0);
	COPY_RSA_KEY(p, 1);
	COPY_RSA_KEY(iqmp, 2);
	COPY_RSA_KEY(dmq1, 3);
	COPY_RSA_KEY(dmp1, 4);
	COPY_RSA_KEY(n, 5);
	len = BN_num_bytes(prv->rsa->n);
	fd = sectok_friendly_open(id, STONOWAIT, &sw);
	if (fd < 0) {
		error("sectok_open failed: %s", sectok_get_sw(sw));
		goto done;
	}
	if (! sectok_cardpresent(fd)) {
		error("smartcard in reader %s not present", id);
		goto done;
	}
	ret = sectok_reset(fd, 0, NULL, &sw);
	if (ret <= 0) {
		error("sectok_reset failed: %s", sectok_get_sw(sw));
		goto done;
	}
	if ((cla = cyberflex_inq_class(fd)) < 0) {
		error("cyberflex_inq_class failed");
		goto done;
	}
	memcpy(AUT0, DEFAUT0, sizeof(DEFAUT0));
	if (cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) {
		if (get_AUT0(AUT0) < 0 ||
		    cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) {
			memset(AUT0, 0, sizeof(DEFAUT0));
			error("smartcard passphrase incorrect");
			goto done;
		}
	}
	memset(AUT0, 0, sizeof(DEFAUT0));
	key_fid[0] = 0x00;
	key_fid[1] = 0x12;
	if (cyberflex_load_rsa_priv(fd, cla, key_fid, 5, 8*len, elements,
	    &sw) < 0) {
		error("cyberflex_load_rsa_priv failed: %s", sectok_get_sw(sw));
		goto done;
	}
	if (!sectok_swOK(sw))
		goto done;
	logit("cyberflex_load_rsa_priv done");
	key_fid[0] = 0x73;
	key_fid[1] = 0x68;
	if (cyberflex_load_rsa_pub(fd, cla, key_fid, len, elements[5],
	    &sw) < 0) {
		error("cyberflex_load_rsa_pub failed: %s", sectok_get_sw(sw));
		goto done;
	}
	if (!sectok_swOK(sw))
		goto done;
	logit("cyberflex_load_rsa_pub done");
	status = 0;

done:
	memset(elements[0], '\0', BN_num_bytes(prv->rsa->q));
	memset(elements[1], '\0', BN_num_bytes(prv->rsa->p));
	memset(elements[2], '\0', BN_num_bytes(prv->rsa->iqmp));
	memset(elements[3], '\0', BN_num_bytes(prv->rsa->dmq1));
	memset(elements[4], '\0', BN_num_bytes(prv->rsa->dmp1));
	memset(elements[5], '\0', BN_num_bytes(prv->rsa->n));

	for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++)
		if (elements[i])
			xfree(elements[i]);
	if (fd != -1)
		sectok_close(fd);
	return (status);
}

char *
sc_get_key_label(Key *key)
{
	return xstrdup("smartcard key");
}

#endif /* SMARTCARD && USE_SECTOK */
Commit	Line	Data
31652869	1	/* $OpenBSD: scard.c,v 1.35 2006/08/03 03:34:42 deraadt Exp $ */
637b033d	2	/*
	3	* Copyright (c) 2001 Markus Friedl. All rights reserved.
	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
637b033d	26	#include "includes.h"
295c8801	27	#if defined(SMARTCARD) && defined(USE_SECTOK)
514b94dc	28
31652869	29	#include <sys/types.h>
912da635	30
637b033d	31	#include <sectok.h>
912da635	32	#include <string.h>
637b033d	33
31652869	34	#include <openssl/evp.h>
	35
	36	#include "xmalloc.h"
637b033d	37	#include "key.h"
637b033d	38	#include "log.h"
58ae9cb8	39	#include "misc.h"
86c4f63d	40	#include "scard.h"
637b033d	41
0659cace	42	#if OPENSSL_VERSION_NUMBER < 0x00907000L
	43	#define USE_ENGINE
	44	#define RSA_get_default_method RSA_get_default_openssl_method
	45	#else
7649bbfe	46	#endif
0659cace	47
	48	#ifdef USE_ENGINE
	49	#include <openssl/engine.h>
	50	#define sc_get_rsa sc_get_engine
	51	#else
	52	#define sc_get_rsa sc_get_rsa_method
7649bbfe	53	#endif
7649bbfe	54
637b033d	55	#define CLA_SSH 0x05
	56	#define INS_DECRYPT 0x10
	57	#define INS_GET_KEYLENGTH 0x20
	58	#define INS_GET_PUBKEY 0x30
	59	#define INS_GET_RESPONSE 0xc0
	60
	61	#define MAX_BUF_SIZE 256
	62
86c4f63d	63	u_char DEFAUT0[] = {0xad, 0x9f, 0x61, 0xfe, 0xfa, 0x20, 0xce, 0x63};
86c4f63d	64
637b033d	65	static int sc_fd = -1;
9ff6f66f	66	static char *sc_reader_id = NULL;
86c4f63d	67	static char *sc_pin = NULL;
637b033d	68	static int cla = 0x00; /* class */
637b033d	69
86c4f63d	70	static void sc_mk_digest(const char pin, u_char digest);
86c4f63d	71	static int get_AUT0(u_char *aut0);
7341fad9	72	static int try_AUT0(void);
86c4f63d	73
637b033d	74	/* interface to libsectok */
637b033d	75
184eed6a	76	static int
878b5225	77	sc_open(void)
637b033d	78	{
637b033d	79	int sw;
	80
	81	if (sc_fd >= 0)
	82	return sc_fd;
637b033d	83
9ff6f66f	84	sc_fd = sectok_friendly_open(sc_reader_id, STONOWAIT, &sw);
637b033d	85	if (sc_fd < 0) {
878b5225	86	error("sectok_open failed: %s", sectok_get_sw(sw));
0b595937	87	return SCARD_ERROR_FAIL;
	88	}
	89	if (! sectok_cardpresent(sc_fd)) {
9ff6f66f	90	debug("smartcard in reader %s not present, skipping",
9ff6f66f	91	sc_reader_id);
2251e099	92	sc_close();
0b595937	93	return SCARD_ERROR_NOCARD;
637b033d	94	}
c42158fe	95	if (sectok_reset(sc_fd, 0, NULL, &sw) <= 0) {
637b033d	96	error("sectok_reset failed: %s", sectok_get_sw(sw));
637b033d	97	sc_fd = -1;
0b595937	98	return SCARD_ERROR_FAIL;
637b033d	99	}
c42158fe	100	if ((cla = cyberflex_inq_class(sc_fd)) < 0)
c42158fe	101	cla = 0;
878b5225	102
637b033d	103	debug("sc_open ok %d", sc_fd);
	104	return sc_fd;
	105	}
	106
184eed6a	107	static int
637b033d	108	sc_enable_applet(void)
637b033d	109	{
c42158fe	110	static u_char aid[] = {0xfc, 0x53, 0x73, 0x68, 0x2e, 0x62, 0x69, 0x6e};
c42158fe	111	int sw = 0;
637b033d	112
c42158fe	113	/* select applet id */
c42158fe	114	sectok_apdu(sc_fd, cla, 0xa4, 0x04, 0, sizeof aid, aid, 0, NULL, &sw);
637b033d	115	if (!sectok_swOK(sw)) {
637b033d	116	error("sectok_apdu failed: %s", sectok_get_sw(sw));
878b5225	117	sc_close();
	118	return -1;
	119	}
	120	return 0;
	121	}
	122
184eed6a	123	static int
878b5225	124	sc_init(void)
878b5225	125	{
0b595937	126	int status;
	127
	128	status = sc_open();
	129	if (status == SCARD_ERROR_NOCARD) {
	130	return SCARD_ERROR_NOCARD;
	131	}
d4f40d92	132	if (status < 0) {
878b5225	133	error("sc_open failed");
0b595937	134	return status;
878b5225	135	}
	136	if (sc_enable_applet() < 0) {
	137	error("sc_enable_applet failed");
0b595937	138	return SCARD_ERROR_APPLET;
637b033d	139	}
	140	return 0;
	141	}
	142
184eed6a	143	static int
637b033d	144	sc_read_pubkey(Key * k)
	145	{
	146	u_char buf[2], *n;
	147	char *p;
4e842b5e	148	int len, sw, status = -1;
637b033d	149
637b033d	150	len = sw = 0;
fc1fc39e	151	n = NULL;
637b033d	152
0b595937	153	if (sc_fd < 0) {
0659cace	154	if (sc_init() < 0)
4e842b5e	155	goto err;
0b595937	156	}
878b5225	157
637b033d	158	/* get key size */
637b033d	159	sectok_apdu(sc_fd, CLA_SSH, INS_GET_KEYLENGTH, 0, 0, 0, NULL,
184eed6a	160	sizeof(buf), buf, &sw);
637b033d	161	if (!sectok_swOK(sw)) {
637b033d	162	error("could not obtain key length: %s", sectok_get_sw(sw));
4e842b5e	163	goto err;
637b033d	164	}
	165	len = (buf[0] << 8) \| buf[1];
	166	len /= 8;
	167	debug("INS_GET_KEYLENGTH: len %d sw %s", len, sectok_get_sw(sw));
	168
	169	n = xmalloc(len);
	170	/* get n */
	171	sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
7341fad9	172
	173	if (sw == 0x6982) {
	174	if (try_AUT0() < 0)
	175	goto err;
	176	sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
	177	}
637b033d	178	if (!sectok_swOK(sw)) {
637b033d	179	error("could not obtain public key: %s", sectok_get_sw(sw));
4e842b5e	180	goto err;
637b033d	181	}
4e842b5e	182
637b033d	183	debug("INS_GET_KEYLENGTH: sw %s", sectok_get_sw(sw));
	184
	185	if (BN_bin2bn(n, len, k->rsa->n) == NULL) {
	186	error("c_read_pubkey: BN_bin2bn failed");
4e842b5e	187	goto err;
637b033d	188	}
637b033d	189
	190	/* currently the java applet just stores 'n' */
	191	if (!BN_set_word(k->rsa->e, 35)) {
	192	error("c_read_pubkey: BN_set_word(e, 35) failed");
4e842b5e	193	goto err;
637b033d	194	}
637b033d	195
4e842b5e	196	status = 0;
637b033d	197	p = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
d6133f43	198	debug("fingerprint %u %s", key_size(k), p);
637b033d	199	xfree(p);
637b033d	200
4e842b5e	201	err:
	202	if (n != NULL)
	203	xfree(n);
	204	sc_close();
	205	return status;
637b033d	206	}
	207
	208	/* private key operations */
	209
	210	static int
b9f62352	211	sc_private_decrypt(int flen, u_char from, u_char to, RSA *rsa,
7649bbfe	212	int padding)
637b033d	213	{
637b033d	214	u_char *padded = NULL;
4e842b5e	215	int sw, len, olen, status = -1;
637b033d	216
	217	debug("sc_private_decrypt called");
	218
	219	olen = len = sw = 0;
0b595937	220	if (sc_fd < 0) {
0b595937	221	status = sc_init();
d4f40d92	222	if (status < 0)
878b5225	223	goto err;
0b595937	224	}
637b033d	225	if (padding != RSA_PKCS1_PADDING)
	226	goto err;
	227
	228	len = BN_num_bytes(rsa->n);
	229	padded = xmalloc(len);
	230
86c4f63d	231	sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, len, padded, &sw);
	232
	233	if (sw == 0x6982) {
9fc0407d	234	if (try_AUT0() < 0)
9fc0407d	235	goto err;
86c4f63d	236	sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, len, padded, &sw);
637b033d	237	}
637b033d	238	if (!sectok_swOK(sw)) {
86c4f63d	239	error("sc_private_decrypt: INS_DECRYPT failed: %s",
637b033d	240	sectok_get_sw(sw));
	241	goto err;
	242	}
	243	olen = RSA_padding_check_PKCS1_type_2(to, len, padded + 1, len - 1,
	244	len);
	245	err:
	246	if (padded)
	247	xfree(padded);
4e842b5e	248	sc_close();
0b595937	249	return (olen >= 0 ? olen : status);
637b033d	250	}
	251
	252	static int
b9f62352	253	sc_private_encrypt(int flen, u_char from, u_char to, RSA *rsa,
7649bbfe	254	int padding)
637b033d	255	{
637b033d	256	u_char *padded = NULL;
4e842b5e	257	int sw, len, status = -1;
637b033d	258
637b033d	259	len = sw = 0;
0b595937	260	if (sc_fd < 0) {
0b595937	261	status = sc_init();
d4f40d92	262	if (status < 0)
878b5225	263	goto err;
0b595937	264	}
637b033d	265	if (padding != RSA_PKCS1_PADDING)
	266	goto err;
	267
	268	debug("sc_private_encrypt called");
	269	len = BN_num_bytes(rsa->n);
	270	padded = xmalloc(len);
	271
7649bbfe	272	if (RSA_padding_add_PKCS1_type_1(padded, len, (u_char *)from, flen) <= 0) {
637b033d	273	error("RSA_padding_add_PKCS1_type_1 failed");
	274	goto err;
	275	}
86c4f63d	276	sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, len, to, &sw);
9fc0407d	277	if (sw == 0x6982) {
	278	if (try_AUT0() < 0)
	279	goto err;
	280	sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, len, to, &sw);
	281	}
637b033d	282	if (!sectok_swOK(sw)) {
9fc0407d	283	error("sc_private_encrypt: INS_DECRYPT failed: %s",
637b033d	284	sectok_get_sw(sw));
	285	goto err;
	286	}
637b033d	287	err:
	288	if (padded)
	289	xfree(padded);
4e842b5e	290	sc_close();
0b595937	291	return (len >= 0 ? len : status);
637b033d	292	}
637b033d	293
05b7537a	294	/* called on free */
	295
	296	static int (orig_finish)(RSA rsa) = NULL;
	297
	298	static int
	299	sc_finish(RSA *rsa)
	300	{
	301	if (orig_finish)
	302	orig_finish(rsa);
	303	sc_close();
	304	return 1;
	305	}
	306
637b033d	307	/* engine for overloading private key operations */
637b033d	308
0659cace	309	static RSA_METHOD *
0659cace	310	sc_get_rsa_method(void)
637b033d	311	{
0659cace	312	static RSA_METHOD smart_rsa;
0659cace	313	const RSA_METHOD *def = RSA_get_default_method();
637b033d	314
7649bbfe	315	/* use the OpenSSL version */
	316	memcpy(&smart_rsa, def, sizeof(smart_rsa));
	317
	318	smart_rsa.name = "sectok";
	319
637b033d	320	/* overload */
	321	smart_rsa.rsa_priv_enc = sc_private_encrypt;
	322	smart_rsa.rsa_priv_dec = sc_private_decrypt;
	323
05b7537a	324	/* save original */
	325	orig_finish = def->finish;
	326	smart_rsa.finish = sc_finish;
	327
0659cace	328	return &smart_rsa;
	329	}
	330
	331	#ifdef USE_ENGINE
	332	static ENGINE *
	333	sc_get_engine(void)
	334	{
	335	static ENGINE *smart_engine = NULL;
	336
b775c6f2	337	if ((smart_engine = ENGINE_new()) == NULL)
b775c6f2	338	fatal("ENGINE_new failed");
637b033d	339
	340	ENGINE_set_id(smart_engine, "sectok");
	341	ENGINE_set_name(smart_engine, "libsectok");
7649bbfe	342
0659cace	343	ENGINE_set_RSA(smart_engine, sc_get_rsa_method());
637b033d	344	ENGINE_set_DSA(smart_engine, DSA_get_default_openssl_method());
	345	ENGINE_set_DH(smart_engine, DH_get_default_openssl_method());
	346	ENGINE_set_RAND(smart_engine, RAND_SSLeay());
	347	ENGINE_set_BN_mod_exp(smart_engine, BN_mod_exp);
	348
	349	return smart_engine;
	350	}
0659cace	351	#endif
637b033d	352
878b5225	353	void
	354	sc_close(void)
	355	{
	356	if (sc_fd >= 0) {
	357	sectok_close(sc_fd);
	358	sc_fd = -1;
	359	}
	360	}
	361
0659cace	362	Key **
0659cace	363	sc_get_keys(const char id, const char pin)
637b033d	364	{
0659cace	365	Key k, n, **keys;
0659cace	366	int status, nkeys = 2;
637b033d	367
9ff6f66f	368	if (sc_reader_id != NULL)
	369	xfree(sc_reader_id);
	370	sc_reader_id = xstrdup(id);
	371
86c4f63d	372	if (sc_pin != NULL)
	373	xfree(sc_pin);
	374	sc_pin = (pin == NULL) ? NULL : xstrdup(pin);
	375
637b033d	376	k = key_new(KEY_RSA);
	377	if (k == NULL) {
	378	return NULL;
	379	}
71b7a18e	380	status = sc_read_pubkey(k);
	381	if (status == SCARD_ERROR_NOCARD) {
	382	key_free(k);
	383	return NULL;
	384	}
d4f40d92	385	if (status < 0) {
637b033d	386	error("sc_read_pubkey failed");
	387	key_free(k);
	388	return NULL;
	389	}
52e3daed	390	keys = xcalloc((nkeys+1), sizeof(Key *));
0659cace	391
	392	n = key_new(KEY_RSA1);
	393	BN_copy(n->rsa->n, k->rsa->n);
	394	BN_copy(n->rsa->e, k->rsa->e);
	395	RSA_set_method(n->rsa, sc_get_rsa());
	396	n->flags \|= KEY_FLAG_EXT;
	397	keys[0] = n;
	398
	399	n = key_new(KEY_RSA);
	400	BN_copy(n->rsa->n, k->rsa->n);
	401	BN_copy(n->rsa->e, k->rsa->e);
	402	RSA_set_method(n->rsa, sc_get_rsa());
	403	n->flags \|= KEY_FLAG_EXT;
	404	keys[1] = n;
	405
	406	keys[2] = NULL;
	407
	408	key_free(k);
	409	return keys;
637b033d	410	}
b9f62352	411
	412	#define NUM_RSA_KEY_ELEMENTS 5+1
	413	#define COPY_RSA_KEY(x, i) \
	414	do { \
	415	len = BN_num_bytes(prv->rsa->x); \
	416	elements[i] = xmalloc(len); \
	417	debug("#bytes %d", len); \
	418	if (BN_bn2bin(prv->rsa->x, elements[i]) < 0) \
	419	goto done; \
	420	} while (0)
	421
86c4f63d	422	static void
86c4f63d	423	sc_mk_digest(const char pin, u_char digest)
b9f62352	424	{
	425	const EVP_MD *evp_md = EVP_sha1();
	426	EVP_MD_CTX md;
86c4f63d	427
	428	EVP_DigestInit(&md, evp_md);
	429	EVP_DigestUpdate(&md, pin, strlen(pin));
	430	EVP_DigestFinal(&md, digest, NULL);
	431	}
	432
	433	static int
	434	get_AUT0(u_char *aut0)
	435	{
b9f62352	436	char *pass;
	437
	438	pass = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN);
	439	if (pass == NULL)
	440	return -1;
86c4f63d	441	if (!strcmp(pass, "-")) {
	442	memcpy(aut0, DEFAUT0, sizeof DEFAUT0);
	443	return 0;
	444	}
	445	sc_mk_digest(pass, aut0);
b9f62352	446	memset(pass, 0, strlen(pass));
	447	xfree(pass);
	448	return 0;
	449	}
	450
7341fad9	451	static int
	452	try_AUT0(void)
	453	{
	454	u_char aut0[EVP_MAX_MD_SIZE];
	455
	456	/* permission denied; try PIN if provided */
	457	if (sc_pin && strlen(sc_pin) > 0) {
	458	sc_mk_digest(sc_pin, aut0);
	459	if (cyberflex_verify_AUT0(sc_fd, cla, aut0, 8) < 0) {
	460	error("smartcard passphrase incorrect");
	461	return (-1);
	462	}
	463	} else {
	464	/* try default AUT0 key */
	465	if (cyberflex_verify_AUT0(sc_fd, cla, DEFAUT0, 8) < 0) {
	466	/* default AUT0 key failed; prompt for passphrase */
	467	if (get_AUT0(aut0) < 0 \|\|
	468	cyberflex_verify_AUT0(sc_fd, cla, aut0, 8) < 0) {
	469	error("smartcard passphrase incorrect");
	470	return (-1);
	471	}
	472	}
	473	}
	474	return (0);
	475	}
	476
b9f62352	477	int
	478	sc_put_key(Key prv, const char id)
	479	{
	480	u_char *elements[NUM_RSA_KEY_ELEMENTS];
	481	u_char key_fid[2];
b9f62352	482	u_char AUT0[EVP_MAX_MD_SIZE];
	483	int len, status = -1, i, fd = -1, ret;
	484	int sw = 0, cla = 0x00;
	485
	486	for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++)
	487	elements[i] = NULL;
	488
	489	COPY_RSA_KEY(q, 0);
	490	COPY_RSA_KEY(p, 1);
	491	COPY_RSA_KEY(iqmp, 2);
	492	COPY_RSA_KEY(dmq1, 3);
	493	COPY_RSA_KEY(dmp1, 4);
	494	COPY_RSA_KEY(n, 5);
	495	len = BN_num_bytes(prv->rsa->n);
514b94dc	496	fd = sectok_friendly_open(id, STONOWAIT, &sw);
b9f62352	497	if (fd < 0) {
	498	error("sectok_open failed: %s", sectok_get_sw(sw));
	499	goto done;
	500	}
	501	if (! sectok_cardpresent(fd)) {
514b94dc	502	error("smartcard in reader %s not present", id);
b9f62352	503	goto done;
	504	}
	505	ret = sectok_reset(fd, 0, NULL, &sw);
	506	if (ret <= 0) {
	507	error("sectok_reset failed: %s", sectok_get_sw(sw));
	508	goto done;
	509	}
	510	if ((cla = cyberflex_inq_class(fd)) < 0) {
	511	error("cyberflex_inq_class failed");
	512	goto done;
	513	}
	514	memcpy(AUT0, DEFAUT0, sizeof(DEFAUT0));
	515	if (cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) {
	516	if (get_AUT0(AUT0) < 0 \|\|
	517	cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) {
86c4f63d	518	memset(AUT0, 0, sizeof(DEFAUT0));
86c4f63d	519	error("smartcard passphrase incorrect");
b9f62352	520	goto done;
	521	}
	522	}
86c4f63d	523	memset(AUT0, 0, sizeof(DEFAUT0));
b9f62352	524	key_fid[0] = 0x00;
	525	key_fid[1] = 0x12;
	526	if (cyberflex_load_rsa_priv(fd, cla, key_fid, 5, 8*len, elements,
	527	&sw) < 0) {
	528	error("cyberflex_load_rsa_priv failed: %s", sectok_get_sw(sw));
	529	goto done;
	530	}
	531	if (!sectok_swOK(sw))
	532	goto done;
bbe88b6d	533	logit("cyberflex_load_rsa_priv done");
b9f62352	534	key_fid[0] = 0x73;
	535	key_fid[1] = 0x68;
	536	if (cyberflex_load_rsa_pub(fd, cla, key_fid, len, elements[5],
	537	&sw) < 0) {
	538	error("cyberflex_load_rsa_pub failed: %s", sectok_get_sw(sw));
	539	goto done;
	540	}
	541	if (!sectok_swOK(sw))
	542	goto done;
bbe88b6d	543	logit("cyberflex_load_rsa_pub done");
b9f62352	544	status = 0;
	545
	546	done:
	547	memset(elements[0], '\0', BN_num_bytes(prv->rsa->q));
	548	memset(elements[1], '\0', BN_num_bytes(prv->rsa->p));
	549	memset(elements[2], '\0', BN_num_bytes(prv->rsa->iqmp));
	550	memset(elements[3], '\0', BN_num_bytes(prv->rsa->dmq1));
	551	memset(elements[4], '\0', BN_num_bytes(prv->rsa->dmp1));
	552	memset(elements[5], '\0', BN_num_bytes(prv->rsa->n));
	553
	554	for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++)
	555	if (elements[i])
	556	xfree(elements[i]);
	557	if (fd != -1)
	558	sectok_close(fd);
	559	return (status);
	560	}
244e796f	561
	562	char *
	563	sc_get_key_label(Key *key)
	564	{
	565	return xstrdup("smartcard key");
	566	}
	567
295c8801	568	#endif /* SMARTCARD && USE_SECTOK */