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

/* $OpenBSD: scard.c,v 1.36 2006/11/06 21:25:28 markus 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 <stdarg.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);
	if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
	    (BN_copy(n->rsa->e, k->rsa->e) == NULL))
		fatal("sc_get_keys: BN_copy failed");
	RSA_set_method(n->rsa, sc_get_rsa());
	n->flags |= KEY_FLAG_EXT;
	keys[0] = n;

	n = key_new(KEY_RSA);
	if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) ||
	    (BN_copy(n->rsa->e, k->rsa->e) == NULL))
		fatal("sc_get_keys: BN_copy failed");
	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
ff7ec503	1	/* $OpenBSD: scard.c,v 1.36 2006/11/06 21:25:28 markus Exp $ */
3c0ef626	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
	26	#include "includes.h"
700318f3	27	#if defined(SMARTCARD) && defined(USE_SECTOK)
3c0ef626	28
9108f8d9	29	#include <sys/types.h>
9108f8d9	30
3c0ef626	31	#include <sectok.h>
9108f8d9	32	#include <stdarg.h>
	33	#include <string.h>
	34
	35	#include <openssl/evp.h>
3c0ef626	36
9108f8d9	37	#include "xmalloc.h"
3c0ef626	38	#include "key.h"
3c0ef626	39	#include "log.h"
c9f39d2c	40	#include "misc.h"
3c0ef626	41	#include "scard.h"
3c0ef626	42
700318f3	43	#if OPENSSL_VERSION_NUMBER < 0x00907000L
	44	#define USE_ENGINE
	45	#define RSA_get_default_method RSA_get_default_openssl_method
	46	#else
	47	#endif
	48
	49	#ifdef USE_ENGINE
	50	#include <openssl/engine.h>
	51	#define sc_get_rsa sc_get_engine
	52	#else
	53	#define sc_get_rsa sc_get_rsa_method
	54	#endif
	55
3c0ef626	56	#define CLA_SSH 0x05
	57	#define INS_DECRYPT 0x10
	58	#define INS_GET_KEYLENGTH 0x20
	59	#define INS_GET_PUBKEY 0x30
	60	#define INS_GET_RESPONSE 0xc0
	61
	62	#define MAX_BUF_SIZE 256
	63
700318f3	64	u_char DEFAUT0[] = {0xad, 0x9f, 0x61, 0xfe, 0xfa, 0x20, 0xce, 0x63};
700318f3	65
3c0ef626	66	static int sc_fd = -1;
3c0ef626	67	static char *sc_reader_id = NULL;
700318f3	68	static char *sc_pin = NULL;
3c0ef626	69	static int cla = 0x00; /* class */
3c0ef626	70
700318f3	71	static void sc_mk_digest(const char pin, u_char digest);
	72	static int get_AUT0(u_char *aut0);
	73	static int try_AUT0(void);
	74
3c0ef626	75	/* interface to libsectok */
3c0ef626	76
e9a17296	77	static int
3c0ef626	78	sc_open(void)
	79	{
	80	int sw;
	81
	82	if (sc_fd >= 0)
	83	return sc_fd;
	84
	85	sc_fd = sectok_friendly_open(sc_reader_id, STONOWAIT, &sw);
	86	if (sc_fd < 0) {
	87	error("sectok_open failed: %s", sectok_get_sw(sw));
	88	return SCARD_ERROR_FAIL;
	89	}
	90	if (! sectok_cardpresent(sc_fd)) {
	91	debug("smartcard in reader %s not present, skipping",
	92	sc_reader_id);
	93	sc_close();
	94	return SCARD_ERROR_NOCARD;
	95	}
	96	if (sectok_reset(sc_fd, 0, NULL, &sw) <= 0) {
	97	error("sectok_reset failed: %s", sectok_get_sw(sw));
	98	sc_fd = -1;
	99	return SCARD_ERROR_FAIL;
	100	}
	101	if ((cla = cyberflex_inq_class(sc_fd)) < 0)
	102	cla = 0;
	103
	104	debug("sc_open ok %d", sc_fd);
	105	return sc_fd;
	106	}
	107
e9a17296	108	static int
3c0ef626	109	sc_enable_applet(void)
	110	{
	111	static u_char aid[] = {0xfc, 0x53, 0x73, 0x68, 0x2e, 0x62, 0x69, 0x6e};
	112	int sw = 0;
	113
	114	/* select applet id */
	115	sectok_apdu(sc_fd, cla, 0xa4, 0x04, 0, sizeof aid, aid, 0, NULL, &sw);
	116	if (!sectok_swOK(sw)) {
	117	error("sectok_apdu failed: %s", sectok_get_sw(sw));
	118	sc_close();
	119	return -1;
	120	}
	121	return 0;
	122	}
	123
e9a17296	124	static int
3c0ef626	125	sc_init(void)
	126	{
	127	int status;
	128
	129	status = sc_open();
	130	if (status == SCARD_ERROR_NOCARD) {
	131	return SCARD_ERROR_NOCARD;
	132	}
9108f8d9	133	if (status < 0) {
3c0ef626	134	error("sc_open failed");
	135	return status;
	136	}
	137	if (sc_enable_applet() < 0) {
	138	error("sc_enable_applet failed");
	139	return SCARD_ERROR_APPLET;
	140	}
	141	return 0;
	142	}
	143
e9a17296	144	static int
3c0ef626	145	sc_read_pubkey(Key * k)
	146	{
	147	u_char buf[2], *n;
	148	char *p;
	149	int len, sw, status = -1;
	150
	151	len = sw = 0;
	152	n = NULL;
	153
	154	if (sc_fd < 0) {
700318f3	155	if (sc_init() < 0)
3c0ef626	156	goto err;
	157	}
	158
	159	/* get key size */
	160	sectok_apdu(sc_fd, CLA_SSH, INS_GET_KEYLENGTH, 0, 0, 0, NULL,
e9a17296	161	sizeof(buf), buf, &sw);
3c0ef626	162	if (!sectok_swOK(sw)) {
	163	error("could not obtain key length: %s", sectok_get_sw(sw));
	164	goto err;
	165	}
	166	len = (buf[0] << 8) \| buf[1];
	167	len /= 8;
	168	debug("INS_GET_KEYLENGTH: len %d sw %s", len, sectok_get_sw(sw));
	169
	170	n = xmalloc(len);
	171	/* get n */
	172	sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
700318f3	173
	174	if (sw == 0x6982) {
	175	if (try_AUT0() < 0)
	176	goto err;
	177	sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
	178	}
3c0ef626	179	if (!sectok_swOK(sw)) {
	180	error("could not obtain public key: %s", sectok_get_sw(sw));
	181	goto err;
	182	}
	183
	184	debug("INS_GET_KEYLENGTH: sw %s", sectok_get_sw(sw));
	185
	186	if (BN_bin2bn(n, len, k->rsa->n) == NULL) {
	187	error("c_read_pubkey: BN_bin2bn failed");
	188	goto err;
	189	}
	190
	191	/* currently the java applet just stores 'n' */
	192	if (!BN_set_word(k->rsa->e, 35)) {
	193	error("c_read_pubkey: BN_set_word(e, 35) failed");
	194	goto err;
	195	}
	196
	197	status = 0;
	198	p = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
680cee3b	199	debug("fingerprint %u %s", key_size(k), p);
3c0ef626	200	xfree(p);
	201
	202	err:
	203	if (n != NULL)
	204	xfree(n);
	205	sc_close();
	206	return status;
	207	}
	208
	209	/* private key operations */
	210
	211	static int
700318f3	212	sc_private_decrypt(int flen, u_char from, u_char to, RSA *rsa,
700318f3	213	int padding)
3c0ef626	214	{
	215	u_char *padded = NULL;
	216	int sw, len, olen, status = -1;
	217
	218	debug("sc_private_decrypt called");
	219
	220	olen = len = sw = 0;
	221	if (sc_fd < 0) {
	222	status = sc_init();
9108f8d9	223	if (status < 0)
3c0ef626	224	goto err;
	225	}
	226	if (padding != RSA_PKCS1_PADDING)
	227	goto err;
	228
	229	len = BN_num_bytes(rsa->n);
	230	padded = xmalloc(len);
	231
700318f3	232	sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, len, padded, &sw);
	233
	234	if (sw == 0x6982) {
	235	if (try_AUT0() < 0)
	236	goto err;
	237	sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, len, padded, &sw);
3c0ef626	238	}
3c0ef626	239	if (!sectok_swOK(sw)) {
700318f3	240	error("sc_private_decrypt: INS_DECRYPT failed: %s",
3c0ef626	241	sectok_get_sw(sw));
	242	goto err;
	243	}
	244	olen = RSA_padding_check_PKCS1_type_2(to, len, padded + 1, len - 1,
	245	len);
	246	err:
	247	if (padded)
	248	xfree(padded);
	249	sc_close();
	250	return (olen >= 0 ? olen : status);
	251	}
	252
	253	static int
700318f3	254	sc_private_encrypt(int flen, u_char from, u_char to, RSA *rsa,
700318f3	255	int padding)
3c0ef626	256	{
	257	u_char *padded = NULL;
	258	int sw, len, status = -1;
	259
	260	len = sw = 0;
	261	if (sc_fd < 0) {
	262	status = sc_init();
9108f8d9	263	if (status < 0)
3c0ef626	264	goto err;
	265	}
	266	if (padding != RSA_PKCS1_PADDING)
	267	goto err;
	268
	269	debug("sc_private_encrypt called");
	270	len = BN_num_bytes(rsa->n);
	271	padded = xmalloc(len);
	272
700318f3	273	if (RSA_padding_add_PKCS1_type_1(padded, len, (u_char *)from, flen) <= 0) {
3c0ef626	274	error("RSA_padding_add_PKCS1_type_1 failed");
	275	goto err;
	276	}
700318f3	277	sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, len, to, &sw);
	278	if (sw == 0x6982) {
	279	if (try_AUT0() < 0)
	280	goto err;
	281	sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, len, to, &sw);
3c0ef626	282	}
3c0ef626	283	if (!sectok_swOK(sw)) {
700318f3	284	error("sc_private_encrypt: INS_DECRYPT failed: %s",
3c0ef626	285	sectok_get_sw(sw));
	286	goto err;
	287	}
	288	err:
	289	if (padded)
	290	xfree(padded);
	291	sc_close();
	292	return (len >= 0 ? len : status);
	293	}
	294
	295	/* called on free */
	296
	297	static int (orig_finish)(RSA rsa) = NULL;
	298
	299	static int
	300	sc_finish(RSA *rsa)
	301	{
	302	if (orig_finish)
	303	orig_finish(rsa);
	304	sc_close();
	305	return 1;
	306	}
	307
3c0ef626	308	/* engine for overloading private key operations */
3c0ef626	309
700318f3	310	static RSA_METHOD *
700318f3	311	sc_get_rsa_method(void)
3c0ef626	312	{
700318f3	313	static RSA_METHOD smart_rsa;
	314	const RSA_METHOD *def = RSA_get_default_method();
	315
	316	/* use the OpenSSL version */
	317	memcpy(&smart_rsa, def, sizeof(smart_rsa));
3c0ef626	318
700318f3	319	smart_rsa.name = "sectok";
3c0ef626	320
	321	/* overload */
	322	smart_rsa.rsa_priv_enc = sc_private_encrypt;
	323	smart_rsa.rsa_priv_dec = sc_private_decrypt;
	324
	325	/* save original */
	326	orig_finish = def->finish;
	327	smart_rsa.finish = sc_finish;
	328
700318f3	329	return &smart_rsa;
	330	}
	331
	332	#ifdef USE_ENGINE
	333	static ENGINE *
	334	sc_get_engine(void)
	335	{
	336	static ENGINE *smart_engine = NULL;
3c0ef626	337
e9a17296	338	if ((smart_engine = ENGINE_new()) == NULL)
e9a17296	339	fatal("ENGINE_new failed");
3c0ef626	340
	341	ENGINE_set_id(smart_engine, "sectok");
	342	ENGINE_set_name(smart_engine, "libsectok");
700318f3	343
700318f3	344	ENGINE_set_RSA(smart_engine, sc_get_rsa_method());
3c0ef626	345	ENGINE_set_DSA(smart_engine, DSA_get_default_openssl_method());
	346	ENGINE_set_DH(smart_engine, DH_get_default_openssl_method());
	347	ENGINE_set_RAND(smart_engine, RAND_SSLeay());
	348	ENGINE_set_BN_mod_exp(smart_engine, BN_mod_exp);
	349
	350	return smart_engine;
	351	}
700318f3	352	#endif
3c0ef626	353
	354	void
	355	sc_close(void)
	356	{
	357	if (sc_fd >= 0) {
	358	sectok_close(sc_fd);
	359	sc_fd = -1;
	360	}
	361	}
	362
700318f3	363	Key **
700318f3	364	sc_get_keys(const char id, const char pin)
3c0ef626	365	{
700318f3	366	Key k, n, **keys;
700318f3	367	int status, nkeys = 2;
3c0ef626	368
	369	if (sc_reader_id != NULL)
	370	xfree(sc_reader_id);
	371	sc_reader_id = xstrdup(id);
	372
700318f3	373	if (sc_pin != NULL)
	374	xfree(sc_pin);
	375	sc_pin = (pin == NULL) ? NULL : xstrdup(pin);
	376
3c0ef626	377	k = key_new(KEY_RSA);
	378	if (k == NULL) {
	379	return NULL;
	380	}
	381	status = sc_read_pubkey(k);
	382	if (status == SCARD_ERROR_NOCARD) {
	383	key_free(k);
	384	return NULL;
	385	}
9108f8d9	386	if (status < 0) {
3c0ef626	387	error("sc_read_pubkey failed");
	388	key_free(k);
	389	return NULL;
	390	}
9108f8d9	391	keys = xcalloc((nkeys+1), sizeof(Key *));
700318f3	392
700318f3	393	n = key_new(KEY_RSA1);
ff7ec503	394	if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) \|\|
	395	(BN_copy(n->rsa->e, k->rsa->e) == NULL))
	396	fatal("sc_get_keys: BN_copy failed");
700318f3	397	RSA_set_method(n->rsa, sc_get_rsa());
	398	n->flags \|= KEY_FLAG_EXT;
	399	keys[0] = n;
	400
	401	n = key_new(KEY_RSA);
ff7ec503	402	if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) \|\|
	403	(BN_copy(n->rsa->e, k->rsa->e) == NULL))
	404	fatal("sc_get_keys: BN_copy failed");
700318f3	405	RSA_set_method(n->rsa, sc_get_rsa());
	406	n->flags \|= KEY_FLAG_EXT;
	407	keys[1] = n;
	408
	409	keys[2] = NULL;
	410
	411	key_free(k);
	412	return keys;
	413	}
	414
	415	#define NUM_RSA_KEY_ELEMENTS 5+1
	416	#define COPY_RSA_KEY(x, i) \
	417	do { \
	418	len = BN_num_bytes(prv->rsa->x); \
	419	elements[i] = xmalloc(len); \
	420	debug("#bytes %d", len); \
	421	if (BN_bn2bin(prv->rsa->x, elements[i]) < 0) \
	422	goto done; \
	423	} while (0)
	424
	425	static void
	426	sc_mk_digest(const char pin, u_char digest)
	427	{
	428	const EVP_MD *evp_md = EVP_sha1();
	429	EVP_MD_CTX md;
	430
	431	EVP_DigestInit(&md, evp_md);
	432	EVP_DigestUpdate(&md, pin, strlen(pin));
	433	EVP_DigestFinal(&md, digest, NULL);
	434	}
	435
	436	static int
	437	get_AUT0(u_char *aut0)
	438	{
	439	char *pass;
	440
	441	pass = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN);
	442	if (pass == NULL)
	443	return -1;
	444	if (!strcmp(pass, "-")) {
	445	memcpy(aut0, DEFAUT0, sizeof DEFAUT0);
	446	return 0;
	447	}
	448	sc_mk_digest(pass, aut0);
	449	memset(pass, 0, strlen(pass));
	450	xfree(pass);
	451	return 0;
	452	}
	453
	454	static int
	455	try_AUT0(void)
	456	{
	457	u_char aut0[EVP_MAX_MD_SIZE];
	458
	459	/* permission denied; try PIN if provided */
	460	if (sc_pin && strlen(sc_pin) > 0) {
	461	sc_mk_digest(sc_pin, aut0);
	462	if (cyberflex_verify_AUT0(sc_fd, cla, aut0, 8) < 0) {
	463	error("smartcard passphrase incorrect");
	464	return (-1);
	465	}
	466	} else {
	467	/* try default AUT0 key */
	468	if (cyberflex_verify_AUT0(sc_fd, cla, DEFAUT0, 8) < 0) {
469	/* default AUT0 key failed; prompt for passphrase */
470	if (get_AUT0(aut0) < 0 \|\|
471	cyberflex_verify_AUT0(sc_fd, cla, aut0, 8) < 0) {
472	error("smartcard passphrase incorrect");
473	return (-1);
474	}
475	}
476	}
477	return (0);
478	}
479
480	int
481	sc_put_key(Key prv, const char id)
482	{
483	u_char *elements[NUM_RSA_KEY_ELEMENTS];
484	u_char key_fid[2];
485	u_char AUT0[EVP_MAX_MD_SIZE];
486	int len, status = -1, i, fd = -1, ret;
487	int sw = 0, cla = 0x00;
488
489	for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++)
490	elements[i] = NULL;
491
492	COPY_RSA_KEY(q, 0);
493	COPY_RSA_KEY(p, 1);
494	COPY_RSA_KEY(iqmp, 2);
495	COPY_RSA_KEY(dmq1, 3);
496	COPY_RSA_KEY(dmp1, 4);
497	COPY_RSA_KEY(n, 5);
498	len = BN_num_bytes(prv->rsa->n);
499	fd = sectok_friendly_open(id, STONOWAIT, &sw);
500	if (fd < 0) {
501	error("sectok_open failed: %s", sectok_get_sw(sw));
502	goto done;
503	}
504	if (! sectok_cardpresent(fd)) {
505	error("smartcard in reader %s not present", id);
506	goto done;
507	}
508	ret = sectok_reset(fd, 0, NULL, &sw);
509	if (ret <= 0) {
510	error("sectok_reset failed: %s", sectok_get_sw(sw));
511	goto done;
512	}
513	if ((cla = cyberflex_inq_class(fd)) < 0) {
514	error("cyberflex_inq_class failed");
515	goto done;
516	}
517	memcpy(AUT0, DEFAUT0, sizeof(DEFAUT0));
518	if (cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) {
519	if (get_AUT0(AUT0) < 0 \|\|
520	cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) {
521	memset(AUT0, 0, sizeof(DEFAUT0));
522	error("smartcard passphrase incorrect");
523	goto done;
524	}
525	}
526	memset(AUT0, 0, sizeof(DEFAUT0));
527	key_fid[0] = 0x00;
528	key_fid[1] = 0x12;
529	if (cyberflex_load_rsa_priv(fd, cla, key_fid, 5, 8*len, elements,
530	&sw) < 0) {
531	error("cyberflex_load_rsa_priv failed: %s", sectok_get_sw(sw));
532	goto done;
533	}
534	if (!sectok_swOK(sw))
535	goto done;
0fff78ff	536	logit("cyberflex_load_rsa_priv done");
700318f3	537	key_fid[0] = 0x73;
	538	key_fid[1] = 0x68;
	539	if (cyberflex_load_rsa_pub(fd, cla, key_fid, len, elements[5],
	540	&sw) < 0) {
	541	error("cyberflex_load_rsa_pub failed: %s", sectok_get_sw(sw));
	542	goto done;
	543	}
	544	if (!sectok_swOK(sw))
	545	goto done;
0fff78ff	546	logit("cyberflex_load_rsa_pub done");
700318f3	547	status = 0;
	548
	549	done:
	550	memset(elements[0], '\0', BN_num_bytes(prv->rsa->q));
	551	memset(elements[1], '\0', BN_num_bytes(prv->rsa->p));
	552	memset(elements[2], '\0', BN_num_bytes(prv->rsa->iqmp));
	553	memset(elements[3], '\0', BN_num_bytes(prv->rsa->dmq1));
	554	memset(elements[4], '\0', BN_num_bytes(prv->rsa->dmp1));
	555	memset(elements[5], '\0', BN_num_bytes(prv->rsa->n));
	556
	557	for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++)
	558	if (elements[i])
	559	xfree(elements[i]);
	560	if (fd != -1)
	561	sectok_close(fd);
	562	return (status);
3c0ef626	563	}
0fff78ff	564
	565	char *
	566	sc_get_key_label(Key *key)
	567	{
	568	return xstrdup("smartcard key");
	569	}
	570
700318f3	571	#endif /* SMARTCARD && USE_SECTOK */