2 * Copyright (c) 2001 Markus Friedl. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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.
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.
26 #if defined(SMARTCARD) && defined(USE_SECTOK)
27 RCSID("$OpenBSD: scard.c,v 1.29 2004/05/08 00:21:31 djm Exp $");
29 #include <openssl/evp.h>
38 #if OPENSSL_VERSION_NUMBER < 0x00907000L
40 #define RSA_get_default_method RSA_get_default_openssl_method
45 #include <openssl/engine.h>
46 #define sc_get_rsa sc_get_engine
48 #define sc_get_rsa sc_get_rsa_method
52 #define INS_DECRYPT 0x10
53 #define INS_GET_KEYLENGTH 0x20
54 #define INS_GET_PUBKEY 0x30
55 #define INS_GET_RESPONSE 0xc0
57 #define MAX_BUF_SIZE 256
59 u_char DEFAUT0[] = {0xad, 0x9f, 0x61, 0xfe, 0xfa, 0x20, 0xce, 0x63};
61 static int sc_fd = -1;
62 static char *sc_reader_id = NULL;
63 static char *sc_pin = NULL;
64 static int cla = 0x00; /* class */
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);
70 /* interface to libsectok */
80 sc_fd = sectok_friendly_open(sc_reader_id, STONOWAIT, &sw);
82 error("sectok_open failed: %s", sectok_get_sw(sw));
83 return SCARD_ERROR_FAIL;
85 if (! sectok_cardpresent(sc_fd)) {
86 debug("smartcard in reader %s not present, skipping",
89 return SCARD_ERROR_NOCARD;
91 if (sectok_reset(sc_fd, 0, NULL, &sw) <= 0) {
92 error("sectok_reset failed: %s", sectok_get_sw(sw));
94 return SCARD_ERROR_FAIL;
96 if ((cla = cyberflex_inq_class(sc_fd)) < 0)
99 debug("sc_open ok %d", sc_fd);
104 sc_enable_applet(void)
106 static u_char aid[] = {0xfc, 0x53, 0x73, 0x68, 0x2e, 0x62, 0x69, 0x6e};
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));
125 if (status == SCARD_ERROR_NOCARD) {
126 return SCARD_ERROR_NOCARD;
129 error("sc_open failed");
132 if (sc_enable_applet() < 0) {
133 error("sc_enable_applet failed");
134 return SCARD_ERROR_APPLET;
140 sc_read_pubkey(Key * k)
144 int len, sw, status = -1;
155 sectok_apdu(sc_fd, CLA_SSH, INS_GET_KEYLENGTH, 0, 0, 0, NULL,
156 sizeof(buf), buf, &sw);
157 if (!sectok_swOK(sw)) {
158 error("could not obtain key length: %s", sectok_get_sw(sw));
161 len = (buf[0] << 8) | buf[1];
163 debug("INS_GET_KEYLENGTH: len %d sw %s", len, sectok_get_sw(sw));
167 sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
172 sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
174 if (!sectok_swOK(sw)) {
175 error("could not obtain public key: %s", sectok_get_sw(sw));
179 debug("INS_GET_KEYLENGTH: sw %s", sectok_get_sw(sw));
181 if (BN_bin2bn(n, len, k->rsa->n) == NULL) {
182 error("c_read_pubkey: BN_bin2bn failed");
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");
193 p = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
194 debug("fingerprint %u %s", key_size(k), p);
204 /* private key operations */
207 sc_private_decrypt(int flen, u_char *from, u_char *to, RSA *rsa,
210 u_char *padded = NULL;
211 int sw, len, olen, status = -1;
213 debug("sc_private_decrypt called");
221 if (padding != RSA_PKCS1_PADDING)
224 len = BN_num_bytes(rsa->n);
225 padded = xmalloc(len);
227 sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, len, padded, &sw);
232 sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, len, padded, &sw);
234 if (!sectok_swOK(sw)) {
235 error("sc_private_decrypt: INS_DECRYPT failed: %s",
239 olen = RSA_padding_check_PKCS1_type_2(to, len, padded + 1, len - 1,
245 return (olen >= 0 ? olen : status);
249 sc_private_encrypt(int flen, u_char *from, u_char *to, RSA *rsa,
252 u_char *padded = NULL;
253 int sw, len, status = -1;
261 if (padding != RSA_PKCS1_PADDING)
264 debug("sc_private_encrypt called");
265 len = BN_num_bytes(rsa->n);
266 padded = xmalloc(len);
268 if (RSA_padding_add_PKCS1_type_1(padded, len, (u_char *)from, flen) <= 0) {
269 error("RSA_padding_add_PKCS1_type_1 failed");
272 sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, len, to, &sw);
276 sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, len, to, &sw);
278 if (!sectok_swOK(sw)) {
279 error("sc_private_encrypt: INS_DECRYPT failed: %s",
287 return (len >= 0 ? len : status);
292 static int (*orig_finish)(RSA *rsa) = NULL;
303 /* engine for overloading private key operations */
306 sc_get_rsa_method(void)
308 static RSA_METHOD smart_rsa;
309 const RSA_METHOD *def = RSA_get_default_method();
311 /* use the OpenSSL version */
312 memcpy(&smart_rsa, def, sizeof(smart_rsa));
314 smart_rsa.name = "sectok";
317 smart_rsa.rsa_priv_enc = sc_private_encrypt;
318 smart_rsa.rsa_priv_dec = sc_private_decrypt;
321 orig_finish = def->finish;
322 smart_rsa.finish = sc_finish;
331 static ENGINE *smart_engine = NULL;
333 if ((smart_engine = ENGINE_new()) == NULL)
334 fatal("ENGINE_new failed");
336 ENGINE_set_id(smart_engine, "sectok");
337 ENGINE_set_name(smart_engine, "libsectok");
339 ENGINE_set_RSA(smart_engine, sc_get_rsa_method());
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);
359 sc_get_keys(const char *id, const char *pin)
362 int status, nkeys = 2;
364 if (sc_reader_id != NULL)
366 sc_reader_id = xstrdup(id);
370 sc_pin = (pin == NULL) ? NULL : xstrdup(pin);
372 k = key_new(KEY_RSA);
376 status = sc_read_pubkey(k);
377 if (status == SCARD_ERROR_NOCARD) {
382 error("sc_read_pubkey failed");
386 keys = xmalloc((nkeys+1) * sizeof(Key *));
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;
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;
408 #define NUM_RSA_KEY_ELEMENTS 5+1
409 #define COPY_RSA_KEY(x, i) \
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) \
419 sc_mk_digest(const char *pin, u_char *digest)
421 const EVP_MD *evp_md = EVP_sha1();
424 EVP_DigestInit(&md, evp_md);
425 EVP_DigestUpdate(&md, pin, strlen(pin));
426 EVP_DigestFinal(&md, digest, NULL);
430 get_AUT0(u_char *aut0)
434 pass = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN);
437 if (!strcmp(pass, "-")) {
438 memcpy(aut0, DEFAUT0, sizeof DEFAUT0);
441 sc_mk_digest(pass, aut0);
442 memset(pass, 0, strlen(pass));
450 u_char aut0[EVP_MAX_MD_SIZE];
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");
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");
474 sc_put_key(Key *prv, const char *id)
476 u_char *elements[NUM_RSA_KEY_ELEMENTS];
478 u_char AUT0[EVP_MAX_MD_SIZE];
479 int len, status = -1, i, fd = -1, ret;
480 int sw = 0, cla = 0x00;
482 for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++)
487 COPY_RSA_KEY(iqmp, 2);
488 COPY_RSA_KEY(dmq1, 3);
489 COPY_RSA_KEY(dmp1, 4);
491 len = BN_num_bytes(prv->rsa->n);
492 fd = sectok_friendly_open(id, STONOWAIT, &sw);
494 error("sectok_open failed: %s", sectok_get_sw(sw));
497 if (! sectok_cardpresent(fd)) {
498 error("smartcard in reader %s not present", id);
501 ret = sectok_reset(fd, 0, NULL, &sw);
503 error("sectok_reset failed: %s", sectok_get_sw(sw));
506 if ((cla = cyberflex_inq_class(fd)) < 0) {
507 error("cyberflex_inq_class failed");
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");
519 memset(AUT0, 0, sizeof(DEFAUT0));
522 if (cyberflex_load_rsa_priv(fd, cla, key_fid, 5, 8*len, elements,
524 error("cyberflex_load_rsa_priv failed: %s", sectok_get_sw(sw));
527 if (!sectok_swOK(sw))
529 logit("cyberflex_load_rsa_priv done");
532 if (cyberflex_load_rsa_pub(fd, cla, key_fid, len, elements[5],
534 error("cyberflex_load_rsa_pub failed: %s", sectok_get_sw(sw));
537 if (!sectok_swOK(sw))
539 logit("cyberflex_load_rsa_pub 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));
550 for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++)
559 sc_get_key_label(Key *key)
561 return xstrdup("smartcard key");
564 #endif /* SMARTCARD && USE_SECTOK */