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.
27 RCSID("$OpenBSD: scard.c,v 1.22 2002/03/21 21:54:34 rees Exp $");
29 #include <openssl/engine.h>
30 #include <openssl/evp.h>
39 #ifdef OPENSSL_VERSION_NUMBER
40 #if OPENSSL_VERSION_NUMBER >= 0x00907000L
41 #define RSA_get_default_openssl_method RSA_get_default_method
42 #define DSA_get_default_openssl_method DSA_get_default_method
43 #define DH_get_default_openssl_method DH_get_default_method
44 #define ENGINE_set_BN_mod_exp(x,y)
49 #define INS_DECRYPT 0x10
50 #define INS_GET_KEYLENGTH 0x20
51 #define INS_GET_PUBKEY 0x30
52 #define INS_GET_RESPONSE 0xc0
54 #define MAX_BUF_SIZE 256
56 u_char DEFAUT0[] = {0xad, 0x9f, 0x61, 0xfe, 0xfa, 0x20, 0xce, 0x63};
58 static int sc_fd = -1;
59 static char *sc_reader_id = NULL;
60 static char *sc_pin = NULL;
61 static int cla = 0x00; /* class */
63 static void sc_mk_digest(const char *pin, u_char *digest);
64 static int get_AUT0(u_char *aut0);
66 /* interface to libsectok */
76 sc_fd = sectok_friendly_open(sc_reader_id, STONOWAIT, &sw);
78 error("sectok_open failed: %s", sectok_get_sw(sw));
79 return SCARD_ERROR_FAIL;
81 if (! sectok_cardpresent(sc_fd)) {
82 debug("smartcard in reader %s not present, skipping",
85 return SCARD_ERROR_NOCARD;
87 if (sectok_reset(sc_fd, 0, NULL, &sw) <= 0) {
88 error("sectok_reset failed: %s", sectok_get_sw(sw));
90 return SCARD_ERROR_FAIL;
92 if ((cla = cyberflex_inq_class(sc_fd)) < 0)
95 debug("sc_open ok %d", sc_fd);
100 sc_enable_applet(void)
102 static u_char aid[] = {0xfc, 0x53, 0x73, 0x68, 0x2e, 0x62, 0x69, 0x6e};
105 /* select applet id */
106 sectok_apdu(sc_fd, cla, 0xa4, 0x04, 0, sizeof aid, aid, 0, NULL, &sw);
107 if (!sectok_swOK(sw)) {
108 error("sectok_apdu failed: %s", sectok_get_sw(sw));
121 if (status == SCARD_ERROR_NOCARD) {
122 return SCARD_ERROR_NOCARD;
125 error("sc_open failed");
128 if (sc_enable_applet() < 0) {
129 error("sc_enable_applet failed");
130 return SCARD_ERROR_APPLET;
136 sc_read_pubkey(Key * k)
140 int len, sw, status = -1;
152 sectok_apdu(sc_fd, CLA_SSH, INS_GET_KEYLENGTH, 0, 0, 0, NULL,
153 sizeof(buf), buf, &sw);
154 if (!sectok_swOK(sw)) {
155 error("could not obtain key length: %s", sectok_get_sw(sw));
158 len = (buf[0] << 8) | buf[1];
160 debug("INS_GET_KEYLENGTH: len %d sw %s", len, sectok_get_sw(sw));
164 sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
165 if (!sectok_swOK(sw)) {
166 error("could not obtain public key: %s", sectok_get_sw(sw));
170 debug("INS_GET_KEYLENGTH: sw %s", sectok_get_sw(sw));
172 if (BN_bin2bn(n, len, k->rsa->n) == NULL) {
173 error("c_read_pubkey: BN_bin2bn failed");
177 /* currently the java applet just stores 'n' */
178 if (!BN_set_word(k->rsa->e, 35)) {
179 error("c_read_pubkey: BN_set_word(e, 35) failed");
184 p = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
185 debug("fingerprint %d %s", key_size(k), p);
195 /* private key operations */
198 sc_private_decrypt(int flen, u_char *from, u_char *to, RSA *rsa,
201 u_char *padded = NULL;
202 u_char aut0[EVP_MAX_MD_SIZE];
203 int sw, len, olen, status = -1;
205 debug("sc_private_decrypt called");
213 if (padding != RSA_PKCS1_PADDING)
216 len = BN_num_bytes(rsa->n);
217 padded = xmalloc(len);
219 sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, len, padded, &sw);
222 /* permission denied; try PIN if provided */
223 if (sc_pin && strlen(sc_pin) > 0) {
224 sc_mk_digest(sc_pin, aut0);
225 if (cyberflex_verify_AUT0(sc_fd, cla, aut0, 8) < 0) {
226 error("smartcard passphrase incorrect");
230 /* try default AUT0 key */
231 if (cyberflex_verify_AUT0(sc_fd, cla, DEFAUT0, 8) < 0) {
232 /* default AUT0 key failed; prompt for passphrase */
233 if (get_AUT0(aut0) < 0 ||
234 cyberflex_verify_AUT0(sc_fd, cla, aut0, 8) < 0) {
235 error("smartcard passphrase incorrect");
240 sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, len, padded, &sw);
242 if (!sectok_swOK(sw)) {
243 error("sc_private_decrypt: INS_DECRYPT failed: %s",
247 olen = RSA_padding_check_PKCS1_type_2(to, len, padded + 1, len - 1,
253 return (olen >= 0 ? olen : status);
257 sc_private_encrypt(int flen, u_char *from, u_char *to, RSA *rsa,
260 u_char *padded = NULL;
261 int sw, len, status = -1;
269 if (padding != RSA_PKCS1_PADDING)
272 debug("sc_private_encrypt called");
273 len = BN_num_bytes(rsa->n);
274 padded = xmalloc(len);
276 if (RSA_padding_add_PKCS1_type_1(padded, len, (u_char *)from, flen) <= 0) {
277 error("RSA_padding_add_PKCS1_type_1 failed");
280 sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, len, to, &sw);
281 if (!sectok_swOK(sw)) {
282 error("sc_private_decrypt: INS_DECRYPT failed: %s",
290 return (len >= 0 ? len : status);
295 static int (*orig_finish)(RSA *rsa) = NULL;
307 /* engine for overloading private key operations */
309 static ENGINE *smart_engine = NULL;
310 static RSA_METHOD smart_rsa;
315 const RSA_METHOD *def;
317 def = RSA_get_default_openssl_method();
319 /* use the OpenSSL version */
320 memcpy(&smart_rsa, def, sizeof(smart_rsa));
322 smart_rsa.name = "sectok";
325 smart_rsa.rsa_priv_enc = sc_private_encrypt;
326 smart_rsa.rsa_priv_dec = sc_private_decrypt;
329 orig_finish = def->finish;
330 smart_rsa.finish = sc_finish;
332 if ((smart_engine = ENGINE_new()) == NULL)
333 fatal("ENGINE_new failed");
335 ENGINE_set_id(smart_engine, "sectok");
336 ENGINE_set_name(smart_engine, "libsectok");
338 ENGINE_set_RSA(smart_engine, &smart_rsa);
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);
357 sc_get_key(const char *id, const char *pin)
362 if (sc_reader_id != NULL)
364 sc_reader_id = xstrdup(id);
368 sc_pin = (pin == NULL) ? NULL : xstrdup(pin);
370 k = key_new(KEY_RSA);
374 status = sc_read_pubkey(k);
375 if (status == SCARD_ERROR_NOCARD) {
380 error("sc_read_pubkey failed");
387 #define NUM_RSA_KEY_ELEMENTS 5+1
388 #define COPY_RSA_KEY(x, i) \
390 len = BN_num_bytes(prv->rsa->x); \
391 elements[i] = xmalloc(len); \
392 debug("#bytes %d", len); \
393 if (BN_bn2bin(prv->rsa->x, elements[i]) < 0) \
398 sc_mk_digest(const char *pin, u_char *digest)
400 const EVP_MD *evp_md = EVP_sha1();
403 EVP_DigestInit(&md, evp_md);
404 EVP_DigestUpdate(&md, pin, strlen(pin));
405 EVP_DigestFinal(&md, digest, NULL);
409 get_AUT0(u_char *aut0)
413 pass = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN);
416 if (!strcmp(pass, "-")) {
417 memcpy(aut0, DEFAUT0, sizeof DEFAUT0);
420 sc_mk_digest(pass, aut0);
421 memset(pass, 0, strlen(pass));
427 sc_put_key(Key *prv, const char *id)
429 u_char *elements[NUM_RSA_KEY_ELEMENTS];
431 u_char AUT0[EVP_MAX_MD_SIZE];
432 int len, status = -1, i, fd = -1, ret;
433 int sw = 0, cla = 0x00;
435 for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++)
440 COPY_RSA_KEY(iqmp, 2);
441 COPY_RSA_KEY(dmq1, 3);
442 COPY_RSA_KEY(dmp1, 4);
444 len = BN_num_bytes(prv->rsa->n);
445 fd = sectok_friendly_open(id, STONOWAIT, &sw);
447 error("sectok_open failed: %s", sectok_get_sw(sw));
450 if (! sectok_cardpresent(fd)) {
451 error("smartcard in reader %s not present", id);
454 ret = sectok_reset(fd, 0, NULL, &sw);
456 error("sectok_reset failed: %s", sectok_get_sw(sw));
459 if ((cla = cyberflex_inq_class(fd)) < 0) {
460 error("cyberflex_inq_class failed");
463 memcpy(AUT0, DEFAUT0, sizeof(DEFAUT0));
464 if (cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) {
465 if (get_AUT0(AUT0) < 0 ||
466 cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) {
467 memset(AUT0, 0, sizeof(DEFAUT0));
468 error("smartcard passphrase incorrect");
472 memset(AUT0, 0, sizeof(DEFAUT0));
475 if (cyberflex_load_rsa_priv(fd, cla, key_fid, 5, 8*len, elements,
477 error("cyberflex_load_rsa_priv failed: %s", sectok_get_sw(sw));
480 if (!sectok_swOK(sw))
482 log("cyberflex_load_rsa_priv done");
485 if (cyberflex_load_rsa_pub(fd, cla, key_fid, len, elements[5],
487 error("cyberflex_load_rsa_pub failed: %s", sectok_get_sw(sw));
490 if (!sectok_swOK(sw))
492 log("cyberflex_load_rsa_pub done");
496 memset(elements[0], '\0', BN_num_bytes(prv->rsa->q));
497 memset(elements[1], '\0', BN_num_bytes(prv->rsa->p));
498 memset(elements[2], '\0', BN_num_bytes(prv->rsa->iqmp));
499 memset(elements[3], '\0', BN_num_bytes(prv->rsa->dmq1));
500 memset(elements[4], '\0', BN_num_bytes(prv->rsa->dmp1));
501 memset(elements[5], '\0', BN_num_bytes(prv->rsa->n));
503 for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++)
510 #endif /* SMARTCARD */