[openssh.git] / 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)

#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
637b033d	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
637b033d	25	#include "includes.h"
295c8801	26	#if defined(SMARTCARD) && defined(USE_SECTOK)
514b94dc	27
b9f62352	28	#include <openssl/evp.h>
637b033d	29	#include <sectok.h>
	30
	31	#include "key.h"
	32	#include "log.h"
	33	#include "xmalloc.h"
58ae9cb8	34	#include "misc.h"
86c4f63d	35	#include "scard.h"
637b033d	36
0659cace	37	#if OPENSSL_VERSION_NUMBER < 0x00907000L
	38	#define USE_ENGINE
	39	#define RSA_get_default_method RSA_get_default_openssl_method
	40	#else
7649bbfe	41	#endif
0659cace	42
	43	#ifdef USE_ENGINE
	44	#include <openssl/engine.h>
	45	#define sc_get_rsa sc_get_engine
	46	#else
	47	#define sc_get_rsa sc_get_rsa_method
7649bbfe	48	#endif
7649bbfe	49
637b033d	50	#define CLA_SSH 0x05
	51	#define INS_DECRYPT 0x10
	52	#define INS_GET_KEYLENGTH 0x20
	53	#define INS_GET_PUBKEY 0x30
	54	#define INS_GET_RESPONSE 0xc0
	55
	56	#define MAX_BUF_SIZE 256
	57
86c4f63d	58	u_char DEFAUT0[] = {0xad, 0x9f, 0x61, 0xfe, 0xfa, 0x20, 0xce, 0x63};
86c4f63d	59
637b033d	60	static int sc_fd = -1;
9ff6f66f	61	static char *sc_reader_id = NULL;
86c4f63d	62	static char *sc_pin = NULL;
637b033d	63	static int cla = 0x00; /* class */
637b033d	64
86c4f63d	65	static void sc_mk_digest(const char pin, u_char digest);
86c4f63d	66	static int get_AUT0(u_char *aut0);
7341fad9	67	static int try_AUT0(void);
86c4f63d	68
637b033d	69	/* interface to libsectok */
637b033d	70
184eed6a	71	static int
878b5225	72	sc_open(void)
637b033d	73	{
637b033d	74	int sw;
	75
	76	if (sc_fd >= 0)
	77	return sc_fd;
637b033d	78
9ff6f66f	79	sc_fd = sectok_friendly_open(sc_reader_id, STONOWAIT, &sw);
637b033d	80	if (sc_fd < 0) {
878b5225	81	error("sectok_open failed: %s", sectok_get_sw(sw));
0b595937	82	return SCARD_ERROR_FAIL;
	83	}
	84	if (! sectok_cardpresent(sc_fd)) {
9ff6f66f	85	debug("smartcard in reader %s not present, skipping",
9ff6f66f	86	sc_reader_id);
2251e099	87	sc_close();
0b595937	88	return SCARD_ERROR_NOCARD;
637b033d	89	}
c42158fe	90	if (sectok_reset(sc_fd, 0, NULL, &sw) <= 0) {
637b033d	91	error("sectok_reset failed: %s", sectok_get_sw(sw));
637b033d	92	sc_fd = -1;
0b595937	93	return SCARD_ERROR_FAIL;
637b033d	94	}
c42158fe	95	if ((cla = cyberflex_inq_class(sc_fd)) < 0)
c42158fe	96	cla = 0;
878b5225	97
637b033d	98	debug("sc_open ok %d", sc_fd);
	99	return sc_fd;
	100	}
	101
184eed6a	102	static int
637b033d	103	sc_enable_applet(void)
637b033d	104	{
c42158fe	105	static u_char aid[] = {0xfc, 0x53, 0x73, 0x68, 0x2e, 0x62, 0x69, 0x6e};
c42158fe	106	int sw = 0;
637b033d	107
c42158fe	108	/* select applet id */
c42158fe	109	sectok_apdu(sc_fd, cla, 0xa4, 0x04, 0, sizeof aid, aid, 0, NULL, &sw);
637b033d	110	if (!sectok_swOK(sw)) {
637b033d	111	error("sectok_apdu failed: %s", sectok_get_sw(sw));
878b5225	112	sc_close();
	113	return -1;
	114	}
	115	return 0;
	116	}
	117
184eed6a	118	static int
878b5225	119	sc_init(void)
878b5225	120	{
0b595937	121	int status;
	122
	123	status = sc_open();
	124	if (status == SCARD_ERROR_NOCARD) {
	125	return SCARD_ERROR_NOCARD;
	126	}
	127	if (status < 0 ) {
878b5225	128	error("sc_open failed");
0b595937	129	return status;
878b5225	130	}
	131	if (sc_enable_applet() < 0) {
	132	error("sc_enable_applet failed");
0b595937	133	return SCARD_ERROR_APPLET;
637b033d	134	}
	135	return 0;
	136	}
	137
184eed6a	138	static int
637b033d	139	sc_read_pubkey(Key * k)
	140	{
	141	u_char buf[2], *n;
	142	char *p;
4e842b5e	143	int len, sw, status = -1;
637b033d	144
637b033d	145	len = sw = 0;
fc1fc39e	146	n = NULL;
637b033d	147
0b595937	148	if (sc_fd < 0) {
0659cace	149	if (sc_init() < 0)
4e842b5e	150	goto err;
0b595937	151	}
878b5225	152
637b033d	153	/* get key size */
637b033d	154	sectok_apdu(sc_fd, CLA_SSH, INS_GET_KEYLENGTH, 0, 0, 0, NULL,
184eed6a	155	sizeof(buf), buf, &sw);
637b033d	156	if (!sectok_swOK(sw)) {
637b033d	157	error("could not obtain key length: %s", sectok_get_sw(sw));
4e842b5e	158	goto err;
637b033d	159	}
	160	len = (buf[0] << 8) \| buf[1];
	161	len /= 8;
	162	debug("INS_GET_KEYLENGTH: len %d sw %s", len, sectok_get_sw(sw));
	163
	164	n = xmalloc(len);
	165	/* get n */
	166	sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
7341fad9	167
	168	if (sw == 0x6982) {
	169	if (try_AUT0() < 0)
	170	goto err;
	171	sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
	172	}
637b033d	173	if (!sectok_swOK(sw)) {
637b033d	174	error("could not obtain public key: %s", sectok_get_sw(sw));
4e842b5e	175	goto err;
637b033d	176	}
4e842b5e	177
637b033d	178	debug("INS_GET_KEYLENGTH: sw %s", sectok_get_sw(sw));
	179
	180	if (BN_bin2bn(n, len, k->rsa->n) == NULL) {
	181	error("c_read_pubkey: BN_bin2bn failed");
4e842b5e	182	goto err;
637b033d	183	}
637b033d	184
	185	/* currently the java applet just stores 'n' */
	186	if (!BN_set_word(k->rsa->e, 35)) {
	187	error("c_read_pubkey: BN_set_word(e, 35) failed");
4e842b5e	188	goto err;
637b033d	189	}
637b033d	190
4e842b5e	191	status = 0;
637b033d	192	p = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
d6133f43	193	debug("fingerprint %u %s", key_size(k), p);
637b033d	194	xfree(p);
637b033d	195
4e842b5e	196	err:
	197	if (n != NULL)
	198	xfree(n);
	199	sc_close();
	200	return status;
637b033d	201	}
	202
	203	/* private key operations */
	204
	205	static int
b9f62352	206	sc_private_decrypt(int flen, u_char from, u_char to, RSA *rsa,
7649bbfe	207	int padding)
637b033d	208	{
637b033d	209	u_char *padded = NULL;
4e842b5e	210	int sw, len, olen, status = -1;
637b033d	211
	212	debug("sc_private_decrypt called");
	213
	214	olen = len = sw = 0;
0b595937	215	if (sc_fd < 0) {
	216	status = sc_init();
	217	if (status < 0 )
878b5225	218	goto err;
0b595937	219	}
637b033d	220	if (padding != RSA_PKCS1_PADDING)
	221	goto err;
	222
	223	len = BN_num_bytes(rsa->n);
	224	padded = xmalloc(len);
	225
86c4f63d	226	sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, len, padded, &sw);
	227
	228	if (sw == 0x6982) {
9fc0407d	229	if (try_AUT0() < 0)
9fc0407d	230	goto err;
86c4f63d	231	sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, len, padded, &sw);
637b033d	232	}
637b033d	233	if (!sectok_swOK(sw)) {
86c4f63d	234	error("sc_private_decrypt: INS_DECRYPT failed: %s",
637b033d	235	sectok_get_sw(sw));
	236	goto err;
	237	}
	238	olen = RSA_padding_check_PKCS1_type_2(to, len, padded + 1, len - 1,
	239	len);
	240	err:
	241	if (padded)
	242	xfree(padded);
4e842b5e	243	sc_close();
0b595937	244	return (olen >= 0 ? olen : status);
637b033d	245	}
	246
	247	static int
b9f62352	248	sc_private_encrypt(int flen, u_char from, u_char to, RSA *rsa,
7649bbfe	249	int padding)
637b033d	250	{
637b033d	251	u_char *padded = NULL;
4e842b5e	252	int sw, len, status = -1;
637b033d	253
637b033d	254	len = sw = 0;
0b595937	255	if (sc_fd < 0) {
	256	status = sc_init();
	257	if (status < 0 )
878b5225	258	goto err;
0b595937	259	}
637b033d	260	if (padding != RSA_PKCS1_PADDING)
	261	goto err;
	262
	263	debug("sc_private_encrypt called");
	264	len = BN_num_bytes(rsa->n);
	265	padded = xmalloc(len);
	266
7649bbfe	267	if (RSA_padding_add_PKCS1_type_1(padded, len, (u_char *)from, flen) <= 0) {
637b033d	268	error("RSA_padding_add_PKCS1_type_1 failed");
	269	goto err;
	270	}
86c4f63d	271	sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, len, to, &sw);
9fc0407d	272	if (sw == 0x6982) {
	273	if (try_AUT0() < 0)
	274	goto err;
	275	sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, len, to, &sw);
	276	}
637b033d	277	if (!sectok_swOK(sw)) {
9fc0407d	278	error("sc_private_encrypt: INS_DECRYPT failed: %s",
637b033d	279	sectok_get_sw(sw));
	280	goto err;
	281	}
637b033d	282	err:
	283	if (padded)
	284	xfree(padded);
4e842b5e	285	sc_close();
0b595937	286	return (len >= 0 ? len : status);
637b033d	287	}
637b033d	288
05b7537a	289	/* called on free */
	290
	291	static int (orig_finish)(RSA rsa) = NULL;
	292
	293	static int
	294	sc_finish(RSA *rsa)
	295	{
	296	if (orig_finish)
	297	orig_finish(rsa);
	298	sc_close();
	299	return 1;
	300	}
	301
637b033d	302	/* engine for overloading private key operations */
637b033d	303
0659cace	304	static RSA_METHOD *
0659cace	305	sc_get_rsa_method(void)
637b033d	306	{
0659cace	307	static RSA_METHOD smart_rsa;
0659cace	308	const RSA_METHOD *def = RSA_get_default_method();
637b033d	309
7649bbfe	310	/* use the OpenSSL version */
	311	memcpy(&smart_rsa, def, sizeof(smart_rsa));
	312
	313	smart_rsa.name = "sectok";
	314
637b033d	315	/* overload */
	316	smart_rsa.rsa_priv_enc = sc_private_encrypt;
	317	smart_rsa.rsa_priv_dec = sc_private_decrypt;
	318
05b7537a	319	/* save original */
	320	orig_finish = def->finish;
	321	smart_rsa.finish = sc_finish;
	322
0659cace	323	return &smart_rsa;
	324	}
	325
	326	#ifdef USE_ENGINE
	327	static ENGINE *
	328	sc_get_engine(void)
	329	{
	330	static ENGINE *smart_engine = NULL;
	331
b775c6f2	332	if ((smart_engine = ENGINE_new()) == NULL)
b775c6f2	333	fatal("ENGINE_new failed");
637b033d	334
	335	ENGINE_set_id(smart_engine, "sectok");
	336	ENGINE_set_name(smart_engine, "libsectok");
7649bbfe	337
0659cace	338	ENGINE_set_RSA(smart_engine, sc_get_rsa_method());
637b033d	339	ENGINE_set_DSA(smart_engine, DSA_get_default_openssl_method());
	340	ENGINE_set_DH(smart_engine, DH_get_default_openssl_method());
	341	ENGINE_set_RAND(smart_engine, RAND_SSLeay());
	342	ENGINE_set_BN_mod_exp(smart_engine, BN_mod_exp);
	343
	344	return smart_engine;
	345	}
0659cace	346	#endif
637b033d	347
878b5225	348	void
	349	sc_close(void)
	350	{
	351	if (sc_fd >= 0) {
	352	sectok_close(sc_fd);
	353	sc_fd = -1;
	354	}
	355	}
	356
0659cace	357	Key **
0659cace	358	sc_get_keys(const char id, const char pin)
637b033d	359	{
0659cace	360	Key k, n, **keys;
0659cace	361	int status, nkeys = 2;
637b033d	362
9ff6f66f	363	if (sc_reader_id != NULL)
	364	xfree(sc_reader_id);
	365	sc_reader_id = xstrdup(id);
	366
86c4f63d	367	if (sc_pin != NULL)
	368	xfree(sc_pin);
	369	sc_pin = (pin == NULL) ? NULL : xstrdup(pin);
	370
637b033d	371	k = key_new(KEY_RSA);
	372	if (k == NULL) {
	373	return NULL;
	374	}
71b7a18e	375	status = sc_read_pubkey(k);
	376	if (status == SCARD_ERROR_NOCARD) {
	377	key_free(k);
	378	return NULL;
	379	}
	380	if (status < 0 ) {
637b033d	381	error("sc_read_pubkey failed");
	382	key_free(k);
	383	return NULL;
	384	}
0659cace	385	keys = xmalloc((nkeys+1) * sizeof(Key *));
	386
	387	n = key_new(KEY_RSA1);
	388	BN_copy(n->rsa->n, k->rsa->n);
	389	BN_copy(n->rsa->e, k->rsa->e);
	390	RSA_set_method(n->rsa, sc_get_rsa());
	391	n->flags \|= KEY_FLAG_EXT;
	392	keys[0] = n;
	393
	394	n = key_new(KEY_RSA);
	395	BN_copy(n->rsa->n, k->rsa->n);
	396	BN_copy(n->rsa->e, k->rsa->e);
	397	RSA_set_method(n->rsa, sc_get_rsa());
	398	n->flags \|= KEY_FLAG_EXT;
	399	keys[1] = n;
	400
	401	keys[2] = NULL;
	402
	403	key_free(k);
	404	return keys;
637b033d	405	}
b9f62352	406
	407	#define NUM_RSA_KEY_ELEMENTS 5+1
	408	#define COPY_RSA_KEY(x, i) \
	409	do { \
	410	len = BN_num_bytes(prv->rsa->x); \
	411	elements[i] = xmalloc(len); \
	412	debug("#bytes %d", len); \
	413	if (BN_bn2bin(prv->rsa->x, elements[i]) < 0) \
	414	goto done; \
	415	} while (0)
	416
86c4f63d	417	static void
86c4f63d	418	sc_mk_digest(const char pin, u_char digest)
b9f62352	419	{
	420	const EVP_MD *evp_md = EVP_sha1();
	421	EVP_MD_CTX md;
86c4f63d	422
	423	EVP_DigestInit(&md, evp_md);
	424	EVP_DigestUpdate(&md, pin, strlen(pin));
	425	EVP_DigestFinal(&md, digest, NULL);
	426	}
	427
	428	static int
	429	get_AUT0(u_char *aut0)
	430	{
b9f62352	431	char *pass;
	432
	433	pass = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN);
	434	if (pass == NULL)
	435	return -1;
86c4f63d	436	if (!strcmp(pass, "-")) {
	437	memcpy(aut0, DEFAUT0, sizeof DEFAUT0);
	438	return 0;
	439	}
	440	sc_mk_digest(pass, aut0);
b9f62352	441	memset(pass, 0, strlen(pass));
	442	xfree(pass);
	443	return 0;
	444	}
	445
7341fad9	446	static int
	447	try_AUT0(void)
	448	{
	449	u_char aut0[EVP_MAX_MD_SIZE];
	450
	451	/* permission denied; try PIN if provided */
	452	if (sc_pin && strlen(sc_pin) > 0) {
	453	sc_mk_digest(sc_pin, aut0);
	454	if (cyberflex_verify_AUT0(sc_fd, cla, aut0, 8) < 0) {
	455	error("smartcard passphrase incorrect");
	456	return (-1);
	457	}
	458	} else {
	459	/* try default AUT0 key */
	460	if (cyberflex_verify_AUT0(sc_fd, cla, DEFAUT0, 8) < 0) {
	461	/* default AUT0 key failed; prompt for passphrase */
	462	if (get_AUT0(aut0) < 0 \|\|
	463	cyberflex_verify_AUT0(sc_fd, cla, aut0, 8) < 0) {
	464	error("smartcard passphrase incorrect");
	465	return (-1);
	466	}
	467	}
	468	}
	469	return (0);
	470	}
	471
b9f62352	472	int
	473	sc_put_key(Key prv, const char id)
	474	{
	475	u_char *elements[NUM_RSA_KEY_ELEMENTS];
	476	u_char key_fid[2];
b9f62352	477	u_char AUT0[EVP_MAX_MD_SIZE];
	478	int len, status = -1, i, fd = -1, ret;
	479	int sw = 0, cla = 0x00;
	480
	481	for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++)
	482	elements[i] = NULL;
	483
	484	COPY_RSA_KEY(q, 0);
	485	COPY_RSA_KEY(p, 1);
	486	COPY_RSA_KEY(iqmp, 2);
	487	COPY_RSA_KEY(dmq1, 3);
	488	COPY_RSA_KEY(dmp1, 4);
	489	COPY_RSA_KEY(n, 5);
	490	len = BN_num_bytes(prv->rsa->n);
514b94dc	491	fd = sectok_friendly_open(id, STONOWAIT, &sw);
b9f62352	492	if (fd < 0) {
	493	error("sectok_open failed: %s", sectok_get_sw(sw));
	494	goto done;
	495	}
	496	if (! sectok_cardpresent(fd)) {
514b94dc	497	error("smartcard in reader %s not present", id);
b9f62352	498	goto done;
	499	}
	500	ret = sectok_reset(fd, 0, NULL, &sw);
	501	if (ret <= 0) {
	502	error("sectok_reset failed: %s", sectok_get_sw(sw));
	503	goto done;
	504	}
	505	if ((cla = cyberflex_inq_class(fd)) < 0) {
	506	error("cyberflex_inq_class failed");
	507	goto done;
	508	}
	509	memcpy(AUT0, DEFAUT0, sizeof(DEFAUT0));
	510	if (cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) {
	511	if (get_AUT0(AUT0) < 0 \|\|
	512	cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) {
86c4f63d	513	memset(AUT0, 0, sizeof(DEFAUT0));
86c4f63d	514	error("smartcard passphrase incorrect");
b9f62352	515	goto done;
	516	}
	517	}
86c4f63d	518	memset(AUT0, 0, sizeof(DEFAUT0));
b9f62352	519	key_fid[0] = 0x00;
	520	key_fid[1] = 0x12;
	521	if (cyberflex_load_rsa_priv(fd, cla, key_fid, 5, 8*len, elements,
	522	&sw) < 0) {
	523	error("cyberflex_load_rsa_priv failed: %s", sectok_get_sw(sw));
	524	goto done;
	525	}
	526	if (!sectok_swOK(sw))
	527	goto done;
bbe88b6d	528	logit("cyberflex_load_rsa_priv done");
b9f62352	529	key_fid[0] = 0x73;
	530	key_fid[1] = 0x68;
	531	if (cyberflex_load_rsa_pub(fd, cla, key_fid, len, elements[5],
	532	&sw) < 0) {
	533	error("cyberflex_load_rsa_pub failed: %s", sectok_get_sw(sw));
	534	goto done;
	535	}
	536	if (!sectok_swOK(sw))
	537	goto done;
bbe88b6d	538	logit("cyberflex_load_rsa_pub done");
b9f62352	539	status = 0;
	540
	541	done:
	542	memset(elements[0], '\0', BN_num_bytes(prv->rsa->q));
	543	memset(elements[1], '\0', BN_num_bytes(prv->rsa->p));
	544	memset(elements[2], '\0', BN_num_bytes(prv->rsa->iqmp));
	545	memset(elements[3], '\0', BN_num_bytes(prv->rsa->dmq1));
	546	memset(elements[4], '\0', BN_num_bytes(prv->rsa->dmp1));
	547	memset(elements[5], '\0', BN_num_bytes(prv->rsa->n));
	548
	549	for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++)
	550	if (elements[i])
	551	xfree(elements[i]);
	552	if (fd != -1)
	553	sectok_close(fd);
	554	return (status);
	555	}
244e796f	556
	557	char *
	558	sc_get_key_label(Key *key)
	559	{
	560	return xstrdup("smartcard key");
	561	}
	562
295c8801	563	#endif /* SMARTCARD && USE_SECTOK */