[gssapi-openssh.git] / openssh / scard.c

/*
 * 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)
RCSID("$OpenBSD: scard.c,v 1.29 2004/05/08 00:21:31 djm Exp $");

#include <openssl/evp.h>
#include <sectok.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 = xmalloc((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
3c0ef626	1	/*
	2	* Copyright (c) 2001 Markus Friedl. All rights reserved.
	3	*
	4	* Redistribution and use in source and binary forms, with or without
	5	* modification, are permitted provided that the following conditions
	6	* are met:
	7	* 1. Redistributions of source code must retain the above copyright
	8	* notice, this list of conditions and the following disclaimer.
	9	* 2. Redistributions in binary form must reproduce the above copyright
	10	* notice, this list of conditions and the following disclaimer in the
	11	* documentation and/or other materials provided with the distribution.
	12	*
	13	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	14	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	15	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	16	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	17	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	18	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	19	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	20	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	21	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	22	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	23	*/
	24
	25	#include "includes.h"
700318f3	26	#if defined(SMARTCARD) && defined(USE_SECTOK)
c9f39d2c	27	RCSID("$OpenBSD: scard.c,v 1.29 2004/05/08 00:21:31 djm Exp $");
3c0ef626	28
700318f3	29	#include <openssl/evp.h>
3c0ef626	30	#include <sectok.h>
	31
	32	#include "key.h"
	33	#include "log.h"
	34	#include "xmalloc.h"
c9f39d2c	35	#include "misc.h"
3c0ef626	36	#include "scard.h"
3c0ef626	37
700318f3	38	#if OPENSSL_VERSION_NUMBER < 0x00907000L
	39	#define USE_ENGINE
	40	#define RSA_get_default_method RSA_get_default_openssl_method
	41	#else
	42	#endif
	43
	44	#ifdef USE_ENGINE
	45	#include <openssl/engine.h>
	46	#define sc_get_rsa sc_get_engine
	47	#else
	48	#define sc_get_rsa sc_get_rsa_method
	49	#endif
	50
3c0ef626	51	#define CLA_SSH 0x05
	52	#define INS_DECRYPT 0x10
	53	#define INS_GET_KEYLENGTH 0x20
	54	#define INS_GET_PUBKEY 0x30
	55	#define INS_GET_RESPONSE 0xc0
	56
	57	#define MAX_BUF_SIZE 256
	58
700318f3	59	u_char DEFAUT0[] = {0xad, 0x9f, 0x61, 0xfe, 0xfa, 0x20, 0xce, 0x63};
700318f3	60
3c0ef626	61	static int sc_fd = -1;
3c0ef626	62	static char *sc_reader_id = NULL;
700318f3	63	static char *sc_pin = NULL;
3c0ef626	64	static int cla = 0x00; /* class */
3c0ef626	65
700318f3	66	static void sc_mk_digest(const char pin, u_char digest);
	67	static int get_AUT0(u_char *aut0);
	68	static int try_AUT0(void);
	69
3c0ef626	70	/* interface to libsectok */
3c0ef626	71
e9a17296	72	static int
3c0ef626	73	sc_open(void)
	74	{
	75	int sw;
	76
	77	if (sc_fd >= 0)
	78	return sc_fd;
	79
	80	sc_fd = sectok_friendly_open(sc_reader_id, STONOWAIT, &sw);
	81	if (sc_fd < 0) {
	82	error("sectok_open failed: %s", sectok_get_sw(sw));
	83	return SCARD_ERROR_FAIL;
	84	}
	85	if (! sectok_cardpresent(sc_fd)) {
	86	debug("smartcard in reader %s not present, skipping",
	87	sc_reader_id);
	88	sc_close();
	89	return SCARD_ERROR_NOCARD;
	90	}
	91	if (sectok_reset(sc_fd, 0, NULL, &sw) <= 0) {
	92	error("sectok_reset failed: %s", sectok_get_sw(sw));
	93	sc_fd = -1;
	94	return SCARD_ERROR_FAIL;
	95	}
	96	if ((cla = cyberflex_inq_class(sc_fd)) < 0)
	97	cla = 0;
	98
	99	debug("sc_open ok %d", sc_fd);
	100	return sc_fd;
	101	}
	102
e9a17296	103	static int
3c0ef626	104	sc_enable_applet(void)
	105	{
	106	static u_char aid[] = {0xfc, 0x53, 0x73, 0x68, 0x2e, 0x62, 0x69, 0x6e};
	107	int sw = 0;
	108
	109	/* select applet id */
	110	sectok_apdu(sc_fd, cla, 0xa4, 0x04, 0, sizeof aid, aid, 0, NULL, &sw);
	111	if (!sectok_swOK(sw)) {
	112	error("sectok_apdu failed: %s", sectok_get_sw(sw));
	113	sc_close();
	114	return -1;
	115	}
	116	return 0;
	117	}
	118
e9a17296	119	static int
3c0ef626	120	sc_init(void)
	121	{
	122	int status;
	123
	124	status = sc_open();
	125	if (status == SCARD_ERROR_NOCARD) {
	126	return SCARD_ERROR_NOCARD;
	127	}
	128	if (status < 0 ) {
	129	error("sc_open failed");
	130	return status;
	131	}
	132	if (sc_enable_applet() < 0) {
	133	error("sc_enable_applet failed");
	134	return SCARD_ERROR_APPLET;
	135	}
	136	return 0;
	137	}
	138
e9a17296	139	static int
3c0ef626	140	sc_read_pubkey(Key * k)
	141	{
	142	u_char buf[2], *n;
	143	char *p;
	144	int len, sw, status = -1;
	145
	146	len = sw = 0;
	147	n = NULL;
	148
	149	if (sc_fd < 0) {
700318f3	150	if (sc_init() < 0)
3c0ef626	151	goto err;
	152	}
	153
	154	/* get key size */
	155	sectok_apdu(sc_fd, CLA_SSH, INS_GET_KEYLENGTH, 0, 0, 0, NULL,
e9a17296	156	sizeof(buf), buf, &sw);
3c0ef626	157	if (!sectok_swOK(sw)) {
	158	error("could not obtain key length: %s", sectok_get_sw(sw));
	159	goto err;
	160	}
	161	len = (buf[0] << 8) \| buf[1];
	162	len /= 8;
	163	debug("INS_GET_KEYLENGTH: len %d sw %s", len, sectok_get_sw(sw));
	164
	165	n = xmalloc(len);
	166	/* get n */
	167	sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
700318f3	168
	169	if (sw == 0x6982) {
	170	if (try_AUT0() < 0)
	171	goto err;
	172	sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
	173	}
3c0ef626	174	if (!sectok_swOK(sw)) {
	175	error("could not obtain public key: %s", sectok_get_sw(sw));
	176	goto err;
	177	}
	178
	179	debug("INS_GET_KEYLENGTH: sw %s", sectok_get_sw(sw));
	180
	181	if (BN_bin2bn(n, len, k->rsa->n) == NULL) {
	182	error("c_read_pubkey: BN_bin2bn failed");
	183	goto err;
	184	}
	185
	186	/* currently the java applet just stores 'n' */
	187	if (!BN_set_word(k->rsa->e, 35)) {
	188	error("c_read_pubkey: BN_set_word(e, 35) failed");
	189	goto err;
	190	}
	191
	192	status = 0;
	193	p = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
680cee3b	194	debug("fingerprint %u %s", key_size(k), p);
3c0ef626	195	xfree(p);
	196
	197	err:
	198	if (n != NULL)
	199	xfree(n);
	200	sc_close();
	201	return status;
	202	}
	203
	204	/* private key operations */
	205
	206	static int
700318f3	207	sc_private_decrypt(int flen, u_char from, u_char to, RSA *rsa,
700318f3	208	int padding)
3c0ef626	209	{
	210	u_char *padded = NULL;
	211	int sw, len, olen, status = -1;
	212
	213	debug("sc_private_decrypt called");
	214
	215	olen = len = sw = 0;
	216	if (sc_fd < 0) {
	217	status = sc_init();
	218	if (status < 0 )
	219	goto err;
	220	}
	221	if (padding != RSA_PKCS1_PADDING)
	222	goto err;
	223
	224	len = BN_num_bytes(rsa->n);
	225	padded = xmalloc(len);
	226
700318f3	227	sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, len, padded, &sw);
	228
	229	if (sw == 0x6982) {
	230	if (try_AUT0() < 0)
	231	goto err;
	232	sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, len, padded, &sw);
3c0ef626	233	}
3c0ef626	234	if (!sectok_swOK(sw)) {
700318f3	235	error("sc_private_decrypt: INS_DECRYPT failed: %s",
3c0ef626	236	sectok_get_sw(sw));
	237	goto err;
	238	}
	239	olen = RSA_padding_check_PKCS1_type_2(to, len, padded + 1, len - 1,
	240	len);
	241	err:
	242	if (padded)
	243	xfree(padded);
	244	sc_close();
	245	return (olen >= 0 ? olen : status);
	246	}
	247
	248	static int
700318f3	249	sc_private_encrypt(int flen, u_char from, u_char to, RSA *rsa,
700318f3	250	int padding)
3c0ef626	251	{
	252	u_char *padded = NULL;
	253	int sw, len, status = -1;
	254
	255	len = sw = 0;
	256	if (sc_fd < 0) {
	257	status = sc_init();
	258	if (status < 0 )
	259	goto err;
	260	}
	261	if (padding != RSA_PKCS1_PADDING)
	262	goto err;
	263
	264	debug("sc_private_encrypt called");
	265	len = BN_num_bytes(rsa->n);
	266	padded = xmalloc(len);
	267
700318f3	268	if (RSA_padding_add_PKCS1_type_1(padded, len, (u_char *)from, flen) <= 0) {
3c0ef626	269	error("RSA_padding_add_PKCS1_type_1 failed");
	270	goto err;
	271	}
700318f3	272	sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, len, to, &sw);
	273	if (sw == 0x6982) {
	274	if (try_AUT0() < 0)
	275	goto err;
	276	sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, len, to, &sw);
3c0ef626	277	}
3c0ef626	278	if (!sectok_swOK(sw)) {
700318f3	279	error("sc_private_encrypt: INS_DECRYPT failed: %s",
3c0ef626	280	sectok_get_sw(sw));
	281	goto err;
	282	}
	283	err:
	284	if (padded)
	285	xfree(padded);
	286	sc_close();
	287	return (len >= 0 ? len : status);
	288	}
	289
	290	/* called on free */
	291
	292	static int (orig_finish)(RSA rsa) = NULL;
	293
	294	static int
	295	sc_finish(RSA *rsa)
	296	{
	297	if (orig_finish)
	298	orig_finish(rsa);
	299	sc_close();
	300	return 1;
	301	}
	302
3c0ef626	303	/* engine for overloading private key operations */
3c0ef626	304
700318f3	305	static RSA_METHOD *
700318f3	306	sc_get_rsa_method(void)
3c0ef626	307	{
700318f3	308	static RSA_METHOD smart_rsa;
	309	const RSA_METHOD *def = RSA_get_default_method();
	310
	311	/* use the OpenSSL version */
	312	memcpy(&smart_rsa, def, sizeof(smart_rsa));
3c0ef626	313
700318f3	314	smart_rsa.name = "sectok";
3c0ef626	315
	316	/* overload */
	317	smart_rsa.rsa_priv_enc = sc_private_encrypt;
	318	smart_rsa.rsa_priv_dec = sc_private_decrypt;
	319
	320	/* save original */
	321	orig_finish = def->finish;
	322	smart_rsa.finish = sc_finish;
	323
700318f3	324	return &smart_rsa;
	325	}
	326
	327	#ifdef USE_ENGINE
	328	static ENGINE *
	329	sc_get_engine(void)
	330	{
	331	static ENGINE *smart_engine = NULL;
3c0ef626	332
e9a17296	333	if ((smart_engine = ENGINE_new()) == NULL)
e9a17296	334	fatal("ENGINE_new failed");
3c0ef626	335
	336	ENGINE_set_id(smart_engine, "sectok");
	337	ENGINE_set_name(smart_engine, "libsectok");
700318f3	338
700318f3	339	ENGINE_set_RSA(smart_engine, sc_get_rsa_method());
3c0ef626	340	ENGINE_set_DSA(smart_engine, DSA_get_default_openssl_method());
	341	ENGINE_set_DH(smart_engine, DH_get_default_openssl_method());
	342	ENGINE_set_RAND(smart_engine, RAND_SSLeay());
	343	ENGINE_set_BN_mod_exp(smart_engine, BN_mod_exp);
	344
	345	return smart_engine;
	346	}
700318f3	347	#endif
3c0ef626	348
	349	void
	350	sc_close(void)
	351	{
	352	if (sc_fd >= 0) {
	353	sectok_close(sc_fd);
	354	sc_fd = -1;
	355	}
	356	}
	357
700318f3	358	Key **
700318f3	359	sc_get_keys(const char id, const char pin)
3c0ef626	360	{
700318f3	361	Key k, n, **keys;
700318f3	362	int status, nkeys = 2;
3c0ef626	363
	364	if (sc_reader_id != NULL)
	365	xfree(sc_reader_id);
	366	sc_reader_id = xstrdup(id);
	367
700318f3	368	if (sc_pin != NULL)
	369	xfree(sc_pin);
	370	sc_pin = (pin == NULL) ? NULL : xstrdup(pin);
	371
3c0ef626	372	k = key_new(KEY_RSA);
	373	if (k == NULL) {
	374	return NULL;
	375	}
	376	status = sc_read_pubkey(k);
	377	if (status == SCARD_ERROR_NOCARD) {
	378	key_free(k);
	379	return NULL;
	380	}
	381	if (status < 0 ) {
	382	error("sc_read_pubkey failed");
	383	key_free(k);
	384	return NULL;
	385	}
700318f3	386	keys = xmalloc((nkeys+1) * sizeof(Key *));
	387
	388	n = key_new(KEY_RSA1);
	389	BN_copy(n->rsa->n, k->rsa->n);
	390	BN_copy(n->rsa->e, k->rsa->e);
	391	RSA_set_method(n->rsa, sc_get_rsa());
	392	n->flags \|= KEY_FLAG_EXT;
	393	keys[0] = n;
	394
	395	n = key_new(KEY_RSA);
	396	BN_copy(n->rsa->n, k->rsa->n);
	397	BN_copy(n->rsa->e, k->rsa->e);
	398	RSA_set_method(n->rsa, sc_get_rsa());
	399	n->flags \|= KEY_FLAG_EXT;
	400	keys[1] = n;
	401
	402	keys[2] = NULL;
	403
	404	key_free(k);
	405	return keys;
	406	}
	407
	408	#define NUM_RSA_KEY_ELEMENTS 5+1
	409	#define COPY_RSA_KEY(x, i) \
	410	do { \
	411	len = BN_num_bytes(prv->rsa->x); \
	412	elements[i] = xmalloc(len); \
	413	debug("#bytes %d", len); \
	414	if (BN_bn2bin(prv->rsa->x, elements[i]) < 0) \
	415	goto done; \
	416	} while (0)
	417
	418	static void
	419	sc_mk_digest(const char pin, u_char digest)
	420	{
	421	const EVP_MD *evp_md = EVP_sha1();
	422	EVP_MD_CTX md;
	423
	424	EVP_DigestInit(&md, evp_md);
	425	EVP_DigestUpdate(&md, pin, strlen(pin));
	426	EVP_DigestFinal(&md, digest, NULL);
	427	}
	428
	429	static int
	430	get_AUT0(u_char *aut0)
	431	{
	432	char *pass;
	433
	434	pass = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN);
	435	if (pass == NULL)
	436	return -1;
	437	if (!strcmp(pass, "-")) {
	438	memcpy(aut0, DEFAUT0, sizeof DEFAUT0);
	439	return 0;
	440	}
	441	sc_mk_digest(pass, aut0);
	442	memset(pass, 0, strlen(pass));
	443	xfree(pass);
	444	return 0;
	445	}
	446
	447	static int
	448	try_AUT0(void)
	449	{
450	u_char aut0[EVP_MAX_MD_SIZE];
451
452	/* permission denied; try PIN if provided */
453	if (sc_pin && strlen(sc_pin) > 0) {
454	sc_mk_digest(sc_pin, aut0);
455	if (cyberflex_verify_AUT0(sc_fd, cla, aut0, 8) < 0) {
456	error("smartcard passphrase incorrect");
457	return (-1);
458	}
459	} else {
460	/* try default AUT0 key */
461	if (cyberflex_verify_AUT0(sc_fd, cla, DEFAUT0, 8) < 0) {
462	/* default AUT0 key failed; prompt for passphrase */
463	if (get_AUT0(aut0) < 0 \|\|
464	cyberflex_verify_AUT0(sc_fd, cla, aut0, 8) < 0) {
465	error("smartcard passphrase incorrect");
466	return (-1);
467	}
468	}
469	}
470	return (0);
471	}
472
473	int
474	sc_put_key(Key prv, const char id)
475	{
476	u_char *elements[NUM_RSA_KEY_ELEMENTS];
477	u_char key_fid[2];
478	u_char AUT0[EVP_MAX_MD_SIZE];
479	int len, status = -1, i, fd = -1, ret;
480	int sw = 0, cla = 0x00;
481
482	for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++)
483	elements[i] = NULL;
484
485	COPY_RSA_KEY(q, 0);
486	COPY_RSA_KEY(p, 1);
487	COPY_RSA_KEY(iqmp, 2);
488	COPY_RSA_KEY(dmq1, 3);
489	COPY_RSA_KEY(dmp1, 4);
490	COPY_RSA_KEY(n, 5);
491	len = BN_num_bytes(prv->rsa->n);
492	fd = sectok_friendly_open(id, STONOWAIT, &sw);
493	if (fd < 0) {
494	error("sectok_open failed: %s", sectok_get_sw(sw));
495	goto done;
496	}
497	if (! sectok_cardpresent(fd)) {
498	error("smartcard in reader %s not present", id);
499	goto done;
500	}
501	ret = sectok_reset(fd, 0, NULL, &sw);
502	if (ret <= 0) {
503	error("sectok_reset failed: %s", sectok_get_sw(sw));
504	goto done;
505	}
506	if ((cla = cyberflex_inq_class(fd)) < 0) {
507	error("cyberflex_inq_class failed");
508	goto done;
509	}
510	memcpy(AUT0, DEFAUT0, sizeof(DEFAUT0));
511	if (cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) {
512	if (get_AUT0(AUT0) < 0 \|\|
513	cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) {
514	memset(AUT0, 0, sizeof(DEFAUT0));
515	error("smartcard passphrase incorrect");
516	goto done;
517	}
518	}
519	memset(AUT0, 0, sizeof(DEFAUT0));
520	key_fid[0] = 0x00;
521	key_fid[1] = 0x12;
522	if (cyberflex_load_rsa_priv(fd, cla, key_fid, 5, 8*len, elements,
523	&sw) < 0) {
524	error("cyberflex_load_rsa_priv failed: %s", sectok_get_sw(sw));
525	goto done;
526	}
527	if (!sectok_swOK(sw))
528	goto done;
0fff78ff	529	logit("cyberflex_load_rsa_priv done");
700318f3	530	key_fid[0] = 0x73;
	531	key_fid[1] = 0x68;
	532	if (cyberflex_load_rsa_pub(fd, cla, key_fid, len, elements[5],
	533	&sw) < 0) {
	534	error("cyberflex_load_rsa_pub failed: %s", sectok_get_sw(sw));
	535	goto done;
	536	}
	537	if (!sectok_swOK(sw))
	538	goto done;
0fff78ff	539	logit("cyberflex_load_rsa_pub done");
700318f3	540	status = 0;
	541
	542	done:
	543	memset(elements[0], '\0', BN_num_bytes(prv->rsa->q));
	544	memset(elements[1], '\0', BN_num_bytes(prv->rsa->p));
	545	memset(elements[2], '\0', BN_num_bytes(prv->rsa->iqmp));
	546	memset(elements[3], '\0', BN_num_bytes(prv->rsa->dmq1));
	547	memset(elements[4], '\0', BN_num_bytes(prv->rsa->dmp1));
	548	memset(elements[5], '\0', BN_num_bytes(prv->rsa->n));
	549
	550	for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++)
	551	if (elements[i])
	552	xfree(elements[i]);
	553	if (fd != -1)
	554	sectok_close(fd);
	555	return (status);
3c0ef626	556	}
0fff78ff	557
	558	char *
	559	sc_get_key_label(Key *key)
	560	{
	561	return xstrdup("smartcard key");
	562	}
	563
700318f3	564	#endif /* SMARTCARD && USE_SECTOK */