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 1.15 2001/09/28 09:49:31 djm Exp $");
29 #include <openssl/engine.h>
38 #define INS_DECRYPT 0x10
39 #define INS_GET_KEYLENGTH 0x20
40 #define INS_GET_PUBKEY 0x30
41 #define INS_GET_RESPONSE 0xc0
43 #define MAX_BUF_SIZE 256
45 static int sc_fd = -1;
46 static char *sc_reader_id = NULL;
47 static int cla = 0x00; /* class */
49 /* interface to libsectok */
59 sc_fd = sectok_friendly_open(sc_reader_id, STONOWAIT, &sw);
61 error("sectok_open failed: %s", sectok_get_sw(sw));
62 return SCARD_ERROR_FAIL;
64 if (! sectok_cardpresent(sc_fd)) {
65 debug("smartcard in reader %s not present, skipping",
68 return SCARD_ERROR_NOCARD;
70 if (sectok_reset(sc_fd, 0, NULL, &sw) <= 0) {
71 error("sectok_reset failed: %s", sectok_get_sw(sw));
73 return SCARD_ERROR_FAIL;
75 if ((cla = cyberflex_inq_class(sc_fd)) < 0)
78 debug("sc_open ok %d", sc_fd);
83 sc_enable_applet(void)
85 static u_char aid[] = {0xfc, 0x53, 0x73, 0x68, 0x2e, 0x62, 0x69, 0x6e};
88 /* select applet id */
89 sectok_apdu(sc_fd, cla, 0xa4, 0x04, 0, sizeof aid, aid, 0, NULL, &sw);
90 if (!sectok_swOK(sw)) {
91 error("sectok_apdu failed: %s", sectok_get_sw(sw));
104 if (status == SCARD_ERROR_NOCARD) {
105 return SCARD_ERROR_NOCARD;
108 error("sc_open failed");
111 if (sc_enable_applet() < 0) {
112 error("sc_enable_applet failed");
113 return SCARD_ERROR_APPLET;
119 sc_read_pubkey(Key * k)
123 int len, sw, status = -1;
135 sectok_apdu(sc_fd, CLA_SSH, INS_GET_KEYLENGTH, 0, 0, 0, NULL,
136 sizeof(buf), buf, &sw);
137 if (!sectok_swOK(sw)) {
138 error("could not obtain key length: %s", sectok_get_sw(sw));
141 len = (buf[0] << 8) | buf[1];
143 debug("INS_GET_KEYLENGTH: len %d sw %s", len, sectok_get_sw(sw));
147 sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
148 if (!sectok_swOK(sw)) {
149 error("could not obtain public key: %s", sectok_get_sw(sw));
153 debug("INS_GET_KEYLENGTH: sw %s", sectok_get_sw(sw));
155 if (BN_bin2bn(n, len, k->rsa->n) == NULL) {
156 error("c_read_pubkey: BN_bin2bn failed");
160 /* currently the java applet just stores 'n' */
161 if (!BN_set_word(k->rsa->e, 35)) {
162 error("c_read_pubkey: BN_set_word(e, 35) failed");
167 p = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
168 debug("fingerprint %d %s", key_size(k), p);
178 /* private key operations */
181 sc_private_decrypt(int flen, u_char *from, u_char *to, RSA *rsa, int padding)
183 u_char *padded = NULL;
184 int sw, len, olen, status = -1;
186 debug("sc_private_decrypt called");
194 if (padding != RSA_PKCS1_PADDING)
197 len = BN_num_bytes(rsa->n);
198 padded = xmalloc(len);
200 sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, 0, NULL, &sw);
201 if (!sectok_swOK(sw)) {
202 error("sc_private_decrypt: INS_DECRYPT failed: %s",
206 sectok_apdu(sc_fd, CLA_SSH, INS_GET_RESPONSE, 0, 0, 0, NULL,
208 if (!sectok_swOK(sw)) {
209 error("sc_private_decrypt: INS_GET_RESPONSE failed: %s",
213 olen = RSA_padding_check_PKCS1_type_2(to, len, padded + 1, len - 1,
219 return (olen >= 0 ? olen : status);
223 sc_private_encrypt(int flen, u_char *from, u_char *to, RSA *rsa, int padding)
225 u_char *padded = NULL;
226 int sw, len, status = -1;
234 if (padding != RSA_PKCS1_PADDING)
237 debug("sc_private_encrypt called");
238 len = BN_num_bytes(rsa->n);
239 padded = xmalloc(len);
241 if (RSA_padding_add_PKCS1_type_1(padded, len, from, flen) <= 0) {
242 error("RSA_padding_add_PKCS1_type_1 failed");
245 sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, 0, NULL, &sw);
246 if (!sectok_swOK(sw)) {
247 error("sc_private_decrypt: INS_DECRYPT failed: %s",
251 sectok_apdu(sc_fd, CLA_SSH, INS_GET_RESPONSE, 0, 0, 0, NULL,
253 if (!sectok_swOK(sw)) {
254 error("sc_private_decrypt: INS_GET_RESPONSE failed: %s",
262 return (len >= 0 ? len : status);
267 static int (*orig_finish)(RSA *rsa) = NULL;
279 /* engine for overloading private key operations */
281 static ENGINE *smart_engine = NULL;
282 static RSA_METHOD smart_rsa =
302 def = RSA_get_default_openssl_method();
305 smart_rsa.rsa_priv_enc = sc_private_encrypt;
306 smart_rsa.rsa_priv_dec = sc_private_decrypt;
309 orig_finish = def->finish;
310 smart_rsa.finish = sc_finish;
312 /* just use the OpenSSL version */
313 smart_rsa.rsa_pub_enc = def->rsa_pub_enc;
314 smart_rsa.rsa_pub_dec = def->rsa_pub_dec;
315 smart_rsa.rsa_mod_exp = def->rsa_mod_exp;
316 smart_rsa.bn_mod_exp = def->bn_mod_exp;
317 smart_rsa.init = def->init;
318 smart_rsa.flags = def->flags;
319 smart_rsa.app_data = def->app_data;
320 smart_rsa.rsa_sign = def->rsa_sign;
321 smart_rsa.rsa_verify = def->rsa_verify;
323 smart_engine = ENGINE_new();
325 ENGINE_set_id(smart_engine, "sectok");
326 ENGINE_set_name(smart_engine, "libsectok");
327 ENGINE_set_RSA(smart_engine, &smart_rsa);
328 ENGINE_set_DSA(smart_engine, DSA_get_default_openssl_method());
329 ENGINE_set_DH(smart_engine, DH_get_default_openssl_method());
330 ENGINE_set_RAND(smart_engine, RAND_SSLeay());
331 ENGINE_set_BN_mod_exp(smart_engine, BN_mod_exp);
346 sc_get_key(const char *id)
351 if (sc_reader_id != NULL)
353 sc_reader_id = xstrdup(id);
355 k = key_new(KEY_RSA);
359 status = sc_read_pubkey(k);
360 if (status == SCARD_ERROR_NOCARD) {
365 error("sc_read_pubkey failed");
371 #endif /* SMARTCARD */