[openssh.git] / scard.c

/* $OpenBSD: scard.c,v 1.33 2006/07/25 02:01:34 stevesk 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 <openssl/evp.h>

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

#include "key.h"
#include "log.h"
#include "xmalloc.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
912da635	1	/* $OpenBSD: scard.c,v 1.33 2006/07/25 02:01:34 stevesk 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
b9f62352	29	#include <openssl/evp.h>
912da635	30
637b033d	31	#include <sectok.h>
912da635	32	#include <string.h>
637b033d	33
	34	#include "key.h"
	35	#include "log.h"
	36	#include "xmalloc.h"
58ae9cb8	37	#include "misc.h"
86c4f63d	38	#include "scard.h"
637b033d	39
0659cace	40	#if OPENSSL_VERSION_NUMBER < 0x00907000L
	41	#define USE_ENGINE
	42	#define RSA_get_default_method RSA_get_default_openssl_method
	43	#else
7649bbfe	44	#endif
0659cace	45
	46	#ifdef USE_ENGINE
	47	#include <openssl/engine.h>
	48	#define sc_get_rsa sc_get_engine
	49	#else
	50	#define sc_get_rsa sc_get_rsa_method
7649bbfe	51	#endif
7649bbfe	52
637b033d	53	#define CLA_SSH 0x05
	54	#define INS_DECRYPT 0x10
	55	#define INS_GET_KEYLENGTH 0x20
	56	#define INS_GET_PUBKEY 0x30
	57	#define INS_GET_RESPONSE 0xc0
	58
	59	#define MAX_BUF_SIZE 256
	60
86c4f63d	61	u_char DEFAUT0[] = {0xad, 0x9f, 0x61, 0xfe, 0xfa, 0x20, 0xce, 0x63};
86c4f63d	62
637b033d	63	static int sc_fd = -1;
9ff6f66f	64	static char *sc_reader_id = NULL;
86c4f63d	65	static char *sc_pin = NULL;
637b033d	66	static int cla = 0x00; /* class */
637b033d	67
86c4f63d	68	static void sc_mk_digest(const char pin, u_char digest);
86c4f63d	69	static int get_AUT0(u_char *aut0);
7341fad9	70	static int try_AUT0(void);
86c4f63d	71
637b033d	72	/* interface to libsectok */
637b033d	73
184eed6a	74	static int
878b5225	75	sc_open(void)
637b033d	76	{
637b033d	77	int sw;
	78
	79	if (sc_fd >= 0)
	80	return sc_fd;
637b033d	81
9ff6f66f	82	sc_fd = sectok_friendly_open(sc_reader_id, STONOWAIT, &sw);
637b033d	83	if (sc_fd < 0) {
878b5225	84	error("sectok_open failed: %s", sectok_get_sw(sw));
0b595937	85	return SCARD_ERROR_FAIL;
	86	}
	87	if (! sectok_cardpresent(sc_fd)) {
9ff6f66f	88	debug("smartcard in reader %s not present, skipping",
9ff6f66f	89	sc_reader_id);
2251e099	90	sc_close();
0b595937	91	return SCARD_ERROR_NOCARD;
637b033d	92	}
c42158fe	93	if (sectok_reset(sc_fd, 0, NULL, &sw) <= 0) {
637b033d	94	error("sectok_reset failed: %s", sectok_get_sw(sw));
637b033d	95	sc_fd = -1;
0b595937	96	return SCARD_ERROR_FAIL;
637b033d	97	}
c42158fe	98	if ((cla = cyberflex_inq_class(sc_fd)) < 0)
c42158fe	99	cla = 0;
878b5225	100
637b033d	101	debug("sc_open ok %d", sc_fd);
	102	return sc_fd;
	103	}
	104
184eed6a	105	static int
637b033d	106	sc_enable_applet(void)
637b033d	107	{
c42158fe	108	static u_char aid[] = {0xfc, 0x53, 0x73, 0x68, 0x2e, 0x62, 0x69, 0x6e};
c42158fe	109	int sw = 0;
637b033d	110
c42158fe	111	/* select applet id */
c42158fe	112	sectok_apdu(sc_fd, cla, 0xa4, 0x04, 0, sizeof aid, aid, 0, NULL, &sw);
637b033d	113	if (!sectok_swOK(sw)) {
637b033d	114	error("sectok_apdu failed: %s", sectok_get_sw(sw));
878b5225	115	sc_close();
	116	return -1;
	117	}
	118	return 0;
	119	}
	120
184eed6a	121	static int
878b5225	122	sc_init(void)
878b5225	123	{
0b595937	124	int status;
	125
	126	status = sc_open();
	127	if (status == SCARD_ERROR_NOCARD) {
	128	return SCARD_ERROR_NOCARD;
	129	}
	130	if (status < 0 ) {
878b5225	131	error("sc_open failed");
0b595937	132	return status;
878b5225	133	}
	134	if (sc_enable_applet() < 0) {
	135	error("sc_enable_applet failed");
0b595937	136	return SCARD_ERROR_APPLET;
637b033d	137	}
	138	return 0;
	139	}
	140
184eed6a	141	static int
637b033d	142	sc_read_pubkey(Key * k)
	143	{
	144	u_char buf[2], *n;
	145	char *p;
4e842b5e	146	int len, sw, status = -1;
637b033d	147
637b033d	148	len = sw = 0;
fc1fc39e	149	n = NULL;
637b033d	150
0b595937	151	if (sc_fd < 0) {
0659cace	152	if (sc_init() < 0)
4e842b5e	153	goto err;
0b595937	154	}
878b5225	155
637b033d	156	/* get key size */
637b033d	157	sectok_apdu(sc_fd, CLA_SSH, INS_GET_KEYLENGTH, 0, 0, 0, NULL,
184eed6a	158	sizeof(buf), buf, &sw);
637b033d	159	if (!sectok_swOK(sw)) {
637b033d	160	error("could not obtain key length: %s", sectok_get_sw(sw));
4e842b5e	161	goto err;
637b033d	162	}
	163	len = (buf[0] << 8) \| buf[1];
	164	len /= 8;
	165	debug("INS_GET_KEYLENGTH: len %d sw %s", len, sectok_get_sw(sw));
	166
	167	n = xmalloc(len);
	168	/* get n */
	169	sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
7341fad9	170
	171	if (sw == 0x6982) {
	172	if (try_AUT0() < 0)
	173	goto err;
	174	sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
	175	}
637b033d	176	if (!sectok_swOK(sw)) {
637b033d	177	error("could not obtain public key: %s", sectok_get_sw(sw));
4e842b5e	178	goto err;
637b033d	179	}
4e842b5e	180
637b033d	181	debug("INS_GET_KEYLENGTH: sw %s", sectok_get_sw(sw));
	182
	183	if (BN_bin2bn(n, len, k->rsa->n) == NULL) {
	184	error("c_read_pubkey: BN_bin2bn failed");
4e842b5e	185	goto err;
637b033d	186	}
637b033d	187
	188	/* currently the java applet just stores 'n' */
	189	if (!BN_set_word(k->rsa->e, 35)) {
	190	error("c_read_pubkey: BN_set_word(e, 35) failed");
4e842b5e	191	goto err;
637b033d	192	}
637b033d	193
4e842b5e	194	status = 0;
637b033d	195	p = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
d6133f43	196	debug("fingerprint %u %s", key_size(k), p);
637b033d	197	xfree(p);
637b033d	198
4e842b5e	199	err:
	200	if (n != NULL)
	201	xfree(n);
	202	sc_close();
	203	return status;
637b033d	204	}
	205
	206	/* private key operations */
	207
	208	static int
b9f62352	209	sc_private_decrypt(int flen, u_char from, u_char to, RSA *rsa,
7649bbfe	210	int padding)
637b033d	211	{
637b033d	212	u_char *padded = NULL;
4e842b5e	213	int sw, len, olen, status = -1;
637b033d	214
	215	debug("sc_private_decrypt called");
	216
	217	olen = len = sw = 0;
0b595937	218	if (sc_fd < 0) {
	219	status = sc_init();
	220	if (status < 0 )
878b5225	221	goto err;
0b595937	222	}
637b033d	223	if (padding != RSA_PKCS1_PADDING)
	224	goto err;
	225
	226	len = BN_num_bytes(rsa->n);
	227	padded = xmalloc(len);
	228
86c4f63d	229	sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, len, padded, &sw);
	230
	231	if (sw == 0x6982) {
9fc0407d	232	if (try_AUT0() < 0)
9fc0407d	233	goto err;
86c4f63d	234	sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, len, padded, &sw);
637b033d	235	}
637b033d	236	if (!sectok_swOK(sw)) {
86c4f63d	237	error("sc_private_decrypt: INS_DECRYPT failed: %s",
637b033d	238	sectok_get_sw(sw));
	239	goto err;
	240	}
	241	olen = RSA_padding_check_PKCS1_type_2(to, len, padded + 1, len - 1,
	242	len);
	243	err:
	244	if (padded)
	245	xfree(padded);
4e842b5e	246	sc_close();
0b595937	247	return (olen >= 0 ? olen : status);
637b033d	248	}
	249
	250	static int
b9f62352	251	sc_private_encrypt(int flen, u_char from, u_char to, RSA *rsa,
7649bbfe	252	int padding)
637b033d	253	{
637b033d	254	u_char *padded = NULL;
4e842b5e	255	int sw, len, status = -1;
637b033d	256
637b033d	257	len = sw = 0;
0b595937	258	if (sc_fd < 0) {
	259	status = sc_init();
	260	if (status < 0 )
878b5225	261	goto err;
0b595937	262	}
637b033d	263	if (padding != RSA_PKCS1_PADDING)
	264	goto err;
	265
	266	debug("sc_private_encrypt called");
	267	len = BN_num_bytes(rsa->n);
	268	padded = xmalloc(len);
	269
7649bbfe	270	if (RSA_padding_add_PKCS1_type_1(padded, len, (u_char *)from, flen) <= 0) {
637b033d	271	error("RSA_padding_add_PKCS1_type_1 failed");
	272	goto err;
	273	}
86c4f63d	274	sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, len, to, &sw);
9fc0407d	275	if (sw == 0x6982) {
	276	if (try_AUT0() < 0)
	277	goto err;
	278	sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, len, to, &sw);
	279	}
637b033d	280	if (!sectok_swOK(sw)) {
9fc0407d	281	error("sc_private_encrypt: INS_DECRYPT failed: %s",
637b033d	282	sectok_get_sw(sw));
	283	goto err;
	284	}
637b033d	285	err:
	286	if (padded)
	287	xfree(padded);
4e842b5e	288	sc_close();
0b595937	289	return (len >= 0 ? len : status);
637b033d	290	}
637b033d	291
05b7537a	292	/* called on free */
	293
	294	static int (orig_finish)(RSA rsa) = NULL;
	295
	296	static int
	297	sc_finish(RSA *rsa)
	298	{
	299	if (orig_finish)
	300	orig_finish(rsa);
	301	sc_close();
	302	return 1;
	303	}
	304
637b033d	305	/* engine for overloading private key operations */
637b033d	306
0659cace	307	static RSA_METHOD *
0659cace	308	sc_get_rsa_method(void)
637b033d	309	{
0659cace	310	static RSA_METHOD smart_rsa;
0659cace	311	const RSA_METHOD *def = RSA_get_default_method();
637b033d	312
7649bbfe	313	/* use the OpenSSL version */
	314	memcpy(&smart_rsa, def, sizeof(smart_rsa));
	315
	316	smart_rsa.name = "sectok";
	317
637b033d	318	/* overload */
	319	smart_rsa.rsa_priv_enc = sc_private_encrypt;
	320	smart_rsa.rsa_priv_dec = sc_private_decrypt;
	321
05b7537a	322	/* save original */
	323	orig_finish = def->finish;
	324	smart_rsa.finish = sc_finish;
	325
0659cace	326	return &smart_rsa;
	327	}
	328
	329	#ifdef USE_ENGINE
	330	static ENGINE *
	331	sc_get_engine(void)
	332	{
	333	static ENGINE *smart_engine = NULL;
	334
b775c6f2	335	if ((smart_engine = ENGINE_new()) == NULL)
b775c6f2	336	fatal("ENGINE_new failed");
637b033d	337
	338	ENGINE_set_id(smart_engine, "sectok");
	339	ENGINE_set_name(smart_engine, "libsectok");
7649bbfe	340
0659cace	341	ENGINE_set_RSA(smart_engine, sc_get_rsa_method());
637b033d	342	ENGINE_set_DSA(smart_engine, DSA_get_default_openssl_method());
	343	ENGINE_set_DH(smart_engine, DH_get_default_openssl_method());
	344	ENGINE_set_RAND(smart_engine, RAND_SSLeay());
	345	ENGINE_set_BN_mod_exp(smart_engine, BN_mod_exp);
	346
	347	return smart_engine;
	348	}
0659cace	349	#endif
637b033d	350
878b5225	351	void
	352	sc_close(void)
	353	{
	354	if (sc_fd >= 0) {
	355	sectok_close(sc_fd);
	356	sc_fd = -1;
	357	}
	358	}
	359
0659cace	360	Key **
0659cace	361	sc_get_keys(const char id, const char pin)
637b033d	362	{
0659cace	363	Key k, n, **keys;
0659cace	364	int status, nkeys = 2;
637b033d	365
9ff6f66f	366	if (sc_reader_id != NULL)
	367	xfree(sc_reader_id);
	368	sc_reader_id = xstrdup(id);
	369
86c4f63d	370	if (sc_pin != NULL)
	371	xfree(sc_pin);
	372	sc_pin = (pin == NULL) ? NULL : xstrdup(pin);
	373
637b033d	374	k = key_new(KEY_RSA);
	375	if (k == NULL) {
	376	return NULL;
	377	}
71b7a18e	378	status = sc_read_pubkey(k);
	379	if (status == SCARD_ERROR_NOCARD) {
	380	key_free(k);
	381	return NULL;
	382	}
	383	if (status < 0 ) {
637b033d	384	error("sc_read_pubkey failed");
	385	key_free(k);
	386	return NULL;
	387	}
52e3daed	388	keys = xcalloc((nkeys+1), sizeof(Key *));
0659cace	389
	390	n = key_new(KEY_RSA1);
	391	BN_copy(n->rsa->n, k->rsa->n);
	392	BN_copy(n->rsa->e, k->rsa->e);
	393	RSA_set_method(n->rsa, sc_get_rsa());
	394	n->flags \|= KEY_FLAG_EXT;
	395	keys[0] = n;
	396
	397	n = key_new(KEY_RSA);
	398	BN_copy(n->rsa->n, k->rsa->n);
	399	BN_copy(n->rsa->e, k->rsa->e);
	400	RSA_set_method(n->rsa, sc_get_rsa());
	401	n->flags \|= KEY_FLAG_EXT;
	402	keys[1] = n;
	403
	404	keys[2] = NULL;
	405
	406	key_free(k);
	407	return keys;
637b033d	408	}
b9f62352	409
	410	#define NUM_RSA_KEY_ELEMENTS 5+1
	411	#define COPY_RSA_KEY(x, i) \
	412	do { \
	413	len = BN_num_bytes(prv->rsa->x); \
	414	elements[i] = xmalloc(len); \
	415	debug("#bytes %d", len); \
	416	if (BN_bn2bin(prv->rsa->x, elements[i]) < 0) \
	417	goto done; \
	418	} while (0)
	419
86c4f63d	420	static void
86c4f63d	421	sc_mk_digest(const char pin, u_char digest)
b9f62352	422	{
	423	const EVP_MD *evp_md = EVP_sha1();
	424	EVP_MD_CTX md;
86c4f63d	425
	426	EVP_DigestInit(&md, evp_md);
	427	EVP_DigestUpdate(&md, pin, strlen(pin));
	428	EVP_DigestFinal(&md, digest, NULL);
	429	}
	430
	431	static int
	432	get_AUT0(u_char *aut0)
	433	{
b9f62352	434	char *pass;
	435
	436	pass = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN);
	437	if (pass == NULL)
	438	return -1;
86c4f63d	439	if (!strcmp(pass, "-")) {
	440	memcpy(aut0, DEFAUT0, sizeof DEFAUT0);
	441	return 0;
	442	}
	443	sc_mk_digest(pass, aut0);
b9f62352	444	memset(pass, 0, strlen(pass));
	445	xfree(pass);
	446	return 0;
	447	}
	448
7341fad9	449	static int
	450	try_AUT0(void)
	451	{
	452	u_char aut0[EVP_MAX_MD_SIZE];
	453
	454	/* permission denied; try PIN if provided */
	455	if (sc_pin && strlen(sc_pin) > 0) {
	456	sc_mk_digest(sc_pin, aut0);
	457	if (cyberflex_verify_AUT0(sc_fd, cla, aut0, 8) < 0) {
	458	error("smartcard passphrase incorrect");
	459	return (-1);
	460	}
	461	} else {
	462	/* try default AUT0 key */
	463	if (cyberflex_verify_AUT0(sc_fd, cla, DEFAUT0, 8) < 0) {
	464	/* default AUT0 key failed; prompt for passphrase */
	465	if (get_AUT0(aut0) < 0 \|\|
	466	cyberflex_verify_AUT0(sc_fd, cla, aut0, 8) < 0) {
	467	error("smartcard passphrase incorrect");
	468	return (-1);
	469	}
	470	}
	471	}
	472	return (0);
	473	}
	474
b9f62352	475	int
	476	sc_put_key(Key prv, const char id)
	477	{
	478	u_char *elements[NUM_RSA_KEY_ELEMENTS];
	479	u_char key_fid[2];
b9f62352	480	u_char AUT0[EVP_MAX_MD_SIZE];
	481	int len, status = -1, i, fd = -1, ret;
	482	int sw = 0, cla = 0x00;
	483
	484	for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++)
	485	elements[i] = NULL;
	486
	487	COPY_RSA_KEY(q, 0);
	488	COPY_RSA_KEY(p, 1);
	489	COPY_RSA_KEY(iqmp, 2);
	490	COPY_RSA_KEY(dmq1, 3);
	491	COPY_RSA_KEY(dmp1, 4);
	492	COPY_RSA_KEY(n, 5);
	493	len = BN_num_bytes(prv->rsa->n);
514b94dc	494	fd = sectok_friendly_open(id, STONOWAIT, &sw);
b9f62352	495	if (fd < 0) {
	496	error("sectok_open failed: %s", sectok_get_sw(sw));
	497	goto done;
	498	}
	499	if (! sectok_cardpresent(fd)) {
514b94dc	500	error("smartcard in reader %s not present", id);
b9f62352	501	goto done;
	502	}
	503	ret = sectok_reset(fd, 0, NULL, &sw);
	504	if (ret <= 0) {
	505	error("sectok_reset failed: %s", sectok_get_sw(sw));
	506	goto done;
	507	}
	508	if ((cla = cyberflex_inq_class(fd)) < 0) {
	509	error("cyberflex_inq_class failed");
	510	goto done;
	511	}
	512	memcpy(AUT0, DEFAUT0, sizeof(DEFAUT0));
	513	if (cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) {
	514	if (get_AUT0(AUT0) < 0 \|\|
	515	cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) {
86c4f63d	516	memset(AUT0, 0, sizeof(DEFAUT0));
86c4f63d	517	error("smartcard passphrase incorrect");
b9f62352	518	goto done;
	519	}
	520	}
86c4f63d	521	memset(AUT0, 0, sizeof(DEFAUT0));
b9f62352	522	key_fid[0] = 0x00;
	523	key_fid[1] = 0x12;
	524	if (cyberflex_load_rsa_priv(fd, cla, key_fid, 5, 8*len, elements,
	525	&sw) < 0) {
	526	error("cyberflex_load_rsa_priv failed: %s", sectok_get_sw(sw));
	527	goto done;
	528	}
	529	if (!sectok_swOK(sw))
	530	goto done;
bbe88b6d	531	logit("cyberflex_load_rsa_priv done");
b9f62352	532	key_fid[0] = 0x73;
	533	key_fid[1] = 0x68;
	534	if (cyberflex_load_rsa_pub(fd, cla, key_fid, len, elements[5],
	535	&sw) < 0) {
	536	error("cyberflex_load_rsa_pub failed: %s", sectok_get_sw(sw));
	537	goto done;
	538	}
	539	if (!sectok_swOK(sw))
	540	goto done;
bbe88b6d	541	logit("cyberflex_load_rsa_pub done");
b9f62352	542	status = 0;
	543
	544	done:
	545	memset(elements[0], '\0', BN_num_bytes(prv->rsa->q));
	546	memset(elements[1], '\0', BN_num_bytes(prv->rsa->p));
	547	memset(elements[2], '\0', BN_num_bytes(prv->rsa->iqmp));
	548	memset(elements[3], '\0', BN_num_bytes(prv->rsa->dmq1));
	549	memset(elements[4], '\0', BN_num_bytes(prv->rsa->dmp1));
	550	memset(elements[5], '\0', BN_num_bytes(prv->rsa->n));
	551
	552	for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++)
	553	if (elements[i])
	554	xfree(elements[i]);
	555	if (fd != -1)
	556	sectok_close(fd);
	557	return (status);
	558	}
244e796f	559
	560	char *
	561	sc_get_key_label(Key *key)
	562	{
	563	return xstrdup("smartcard key");
	564	}
	565
295c8801	566	#endif /* SMARTCARD && USE_SECTOK */