Annotation of src/usr.bin/ssh/scard.c, Revision 1.9
1.1 markus 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:
25: #ifdef SMARTCARD
26: #include "includes.h"
1.9 ! jakob 27: RCSID("$OpenBSD: scard.c,v 1.8 2001/07/30 16:06:07 jakob Exp $");
1.1 markus 28:
29: #include <openssl/engine.h>
30: #include <sectok.h>
31:
32: #include "key.h"
33: #include "log.h"
34: #include "xmalloc.h"
35: #include "scard.h"
36:
37: #define CLA_SSH 0x05
38: #define INS_DECRYPT 0x10
39: #define INS_GET_KEYLENGTH 0x20
40: #define INS_GET_PUBKEY 0x30
41: #define INS_GET_RESPONSE 0xc0
42:
43: #define MAX_BUF_SIZE 256
44:
45: static int sc_fd = -1;
1.5 markus 46: static int sc_reader_num = -1;
1.1 markus 47: static int cla = 0x00; /* class */
48:
49: /* interface to libsectok */
50:
51: static int
1.5 markus 52: sc_open(void)
1.1 markus 53: {
1.4 markus 54: int sw;
1.1 markus 55:
56: if (sc_fd >= 0)
57: return sc_fd;
58:
1.8 jakob 59: sc_fd = sectok_open(sc_reader_num, STONOWAIT, &sw);
1.1 markus 60: if (sc_fd < 0) {
1.5 markus 61: error("sectok_open failed: %s", sectok_get_sw(sw));
1.8 jakob 62: return SCARD_ERROR_FAIL;
63: }
64: if (! sectok_cardpresent(sc_fd)) {
1.9 ! jakob 65: debug("smartcard in reader %d not present, skipping",
1.8 jakob 66: sc_reader_num);
67: return SCARD_ERROR_NOCARD;
1.1 markus 68: }
1.7 rees 69: if (sectok_reset(sc_fd, 0, NULL, &sw) <= 0) {
1.4 markus 70: error("sectok_reset failed: %s", sectok_get_sw(sw));
1.1 markus 71: sc_fd = -1;
1.8 jakob 72: return SCARD_ERROR_FAIL;
1.1 markus 73: }
1.7 rees 74: if ((cla = cyberflex_inq_class(sc_fd)) < 0)
75: cla = 0;
1.5 markus 76:
1.4 markus 77: debug("sc_open ok %d", sc_fd);
1.1 markus 78: return sc_fd;
79: }
80:
81: static int
1.4 markus 82: sc_enable_applet(void)
1.1 markus 83: {
1.7 rees 84: static u_char aid[] = {0xfc, 0x53, 0x73, 0x68, 0x2e, 0x62, 0x69, 0x6e};
85: int sw = 0;
1.1 markus 86:
1.7 rees 87: /* select applet id */
88: sectok_apdu(sc_fd, cla, 0xa4, 0x04, 0, sizeof aid, aid, 0, NULL, &sw);
1.4 markus 89: if (!sectok_swOK(sw)) {
90: error("sectok_apdu failed: %s", sectok_get_sw(sw));
1.5 markus 91: sc_close();
92: return -1;
93: }
94: return 0;
95: }
96:
97: static int
98: sc_init(void)
99: {
1.8 jakob 100: int status;
101:
102: status = sc_open();
103: if (status == SCARD_ERROR_NOCARD) {
104: return SCARD_ERROR_NOCARD;
105: }
106: if (status < 0 ) {
1.5 markus 107: error("sc_open failed");
1.8 jakob 108: return status;
1.5 markus 109: }
110: if (sc_enable_applet() < 0) {
111: error("sc_enable_applet failed");
1.8 jakob 112: return SCARD_ERROR_APPLET;
1.1 markus 113: }
114: return 0;
115: }
116:
117: static int
118: sc_read_pubkey(Key * k)
119: {
1.4 markus 120: u_char buf[2], *n;
121: char *p;
1.8 jakob 122: int len, sw, status;
1.1 markus 123:
1.4 markus 124: len = sw = 0;
1.1 markus 125:
1.8 jakob 126: if (sc_fd < 0) {
127: status = sc_init();
128: if (status < 0 )
129: return status;
130: }
1.5 markus 131:
1.1 markus 132: /* get key size */
1.4 markus 133: sectok_apdu(sc_fd, CLA_SSH, INS_GET_KEYLENGTH, 0, 0, 0, NULL,
134: sizeof(buf), buf, &sw);
135: if (!sectok_swOK(sw)) {
136: error("could not obtain key length: %s", sectok_get_sw(sw));
1.5 markus 137: sc_close();
1.4 markus 138: return -1;
1.1 markus 139: }
140: len = (buf[0] << 8) | buf[1];
141: len /= 8;
1.4 markus 142: debug("INS_GET_KEYLENGTH: len %d sw %s", len, sectok_get_sw(sw));
1.1 markus 143:
1.4 markus 144: n = xmalloc(len);
1.1 markus 145: /* get n */
1.4 markus 146: sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
147: if (!sectok_swOK(sw)) {
148: error("could not obtain public key: %s", sectok_get_sw(sw));
149: xfree(n);
150: return -1;
1.1 markus 151: }
1.4 markus 152: debug("INS_GET_KEYLENGTH: sw %s", sectok_get_sw(sw));
153:
154: if (BN_bin2bn(n, len, k->rsa->n) == NULL) {
155: error("c_read_pubkey: BN_bin2bn failed");
156: xfree(n);
1.5 markus 157: sc_close();
1.4 markus 158: return -1;
159: }
160: xfree(n);
1.1 markus 161:
162: /* currently the java applet just stores 'n' */
1.4 markus 163: if (!BN_set_word(k->rsa->e, 35)) {
164: error("c_read_pubkey: BN_set_word(e, 35) failed");
165: return -1;
166: }
1.1 markus 167:
168: p = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
169: debug("fingerprint %d %s", key_size(k), p);
170: xfree(p);
171:
172: return 0;
173: }
174:
175: /* private key operations */
176:
177: static int
1.4 markus 178: sc_private_decrypt(int flen, u_char *from, u_char *to, RSA *rsa, int padding)
1.1 markus 179: {
1.4 markus 180: u_char *padded = NULL;
1.8 jakob 181: int sw, len, olen, status;
1.1 markus 182:
183: debug("sc_private_decrypt called");
184:
1.4 markus 185: olen = len = sw = 0;
1.8 jakob 186: if (sc_fd < 0) {
187: status = sc_init();
188: if (status < 0 )
1.5 markus 189: goto err;
1.8 jakob 190: }
1.4 markus 191: if (padding != RSA_PKCS1_PADDING)
1.1 markus 192: goto err;
193:
1.4 markus 194: len = BN_num_bytes(rsa->n);
195: padded = xmalloc(len);
1.1 markus 196:
1.4 markus 197: sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, 0, NULL, &sw);
198: if (!sectok_swOK(sw)) {
199: error("sc_private_decrypt: INS_DECRYPT failed: %s",
200: sectok_get_sw(sw));
1.5 markus 201: sc_close();
1.1 markus 202: goto err;
203: }
1.4 markus 204: sectok_apdu(sc_fd, CLA_SSH, INS_GET_RESPONSE, 0, 0, 0, NULL,
205: len, padded, &sw);
206: if (!sectok_swOK(sw)) {
207: error("sc_private_decrypt: INS_GET_RESPONSE failed: %s",
208: sectok_get_sw(sw));
1.5 markus 209: sc_close();
1.1 markus 210: goto err;
211: }
1.4 markus 212: olen = RSA_padding_check_PKCS1_type_2(to, len, padded + 1, len - 1,
213: len);
1.1 markus 214: err:
215: if (padded)
216: xfree(padded);
1.8 jakob 217: return (olen >= 0 ? olen : status);
1.1 markus 218: }
219:
220: static int
1.4 markus 221: sc_private_encrypt(int flen, u_char *from, u_char *to, RSA *rsa, int padding)
1.1 markus 222: {
1.4 markus 223: u_char *padded = NULL;
1.8 jakob 224: int sw, len, status;
1.1 markus 225:
1.4 markus 226: len = sw = 0;
1.8 jakob 227: if (sc_fd < 0) {
228: status = sc_init();
229: if (status < 0 )
1.5 markus 230: goto err;
1.8 jakob 231: }
1.4 markus 232: if (padding != RSA_PKCS1_PADDING)
1.1 markus 233: goto err;
234:
1.3 markus 235: debug("sc_private_encrypt called");
1.4 markus 236: len = BN_num_bytes(rsa->n);
237: padded = xmalloc(len);
238:
239: if (RSA_padding_add_PKCS1_type_1(padded, len, from, flen) <= 0) {
1.1 markus 240: error("RSA_padding_add_PKCS1_type_1 failed");
241: goto err;
242: }
1.4 markus 243: sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, 0, NULL, &sw);
244: if (!sectok_swOK(sw)) {
245: error("sc_private_decrypt: INS_DECRYPT failed: %s",
246: sectok_get_sw(sw));
1.5 markus 247: sc_close();
1.4 markus 248: goto err;
249: }
250: sectok_apdu(sc_fd, CLA_SSH, INS_GET_RESPONSE, 0, 0, 0, NULL,
251: len, to, &sw);
252: if (!sectok_swOK(sw)) {
253: error("sc_private_decrypt: INS_GET_RESPONSE failed: %s",
254: sectok_get_sw(sw));
1.5 markus 255: sc_close();
1.4 markus 256: goto err;
1.1 markus 257: }
258: err:
259: if (padded)
260: xfree(padded);
1.8 jakob 261: return (len >= 0 ? len : status);
1.1 markus 262: }
263:
264: /* engine for overloading private key operations */
265:
266: static ENGINE *smart_engine = NULL;
267: static RSA_METHOD smart_rsa =
268: {
1.4 markus 269: "sectok",
270: NULL,
271: NULL,
272: NULL,
273: NULL,
274: NULL,
275: NULL,
276: NULL,
277: NULL,
278: 0,
279: NULL,
1.1 markus 280: };
281:
282: ENGINE *
1.2 itojun 283: sc_get_engine(void)
1.1 markus 284: {
285: RSA_METHOD *def;
286:
287: def = RSA_get_default_openssl_method();
288:
289: /* overload */
290: smart_rsa.rsa_priv_enc = sc_private_encrypt;
291: smart_rsa.rsa_priv_dec = sc_private_decrypt;
292:
293: /* just use the OpenSSL version */
1.4 markus 294: smart_rsa.rsa_pub_enc = def->rsa_pub_enc;
295: smart_rsa.rsa_pub_dec = def->rsa_pub_dec;
1.1 markus 296: smart_rsa.rsa_mod_exp = def->rsa_mod_exp;
297: smart_rsa.bn_mod_exp = def->bn_mod_exp;
298: smart_rsa.init = def->init;
299: smart_rsa.finish = def->finish;
300: smart_rsa.flags = def->flags;
301: smart_rsa.app_data = def->app_data;
302: smart_rsa.rsa_sign = def->rsa_sign;
303: smart_rsa.rsa_verify = def->rsa_verify;
304:
305: smart_engine = ENGINE_new();
306:
1.4 markus 307: ENGINE_set_id(smart_engine, "sectok");
308: ENGINE_set_name(smart_engine, "libsectok");
1.1 markus 309: ENGINE_set_RSA(smart_engine, &smart_rsa);
310: ENGINE_set_DSA(smart_engine, DSA_get_default_openssl_method());
311: ENGINE_set_DH(smart_engine, DH_get_default_openssl_method());
312: ENGINE_set_RAND(smart_engine, RAND_SSLeay());
313: ENGINE_set_BN_mod_exp(smart_engine, BN_mod_exp);
314:
315: return smart_engine;
316: }
317:
1.5 markus 318: void
319: sc_close(void)
320: {
321: if (sc_fd >= 0) {
322: sectok_close(sc_fd);
323: sc_fd = -1;
324: }
325: }
326:
1.1 markus 327: Key *
1.5 markus 328: sc_get_key(int num)
1.1 markus 329: {
330: Key *k;
1.9 ! jakob 331: int status;
1.1 markus 332:
1.5 markus 333: sc_reader_num = num;
1.1 markus 334: k = key_new(KEY_RSA);
335: if (k == NULL) {
336: return NULL;
337: }
1.9 ! jakob 338: status = sc_read_pubkey(k);
! 339: if (status == SCARD_ERROR_NOCARD) {
! 340: key_free(k);
! 341: return NULL;
! 342: }
! 343: if (status < 0 ) {
1.1 markus 344: error("sc_read_pubkey failed");
345: key_free(k);
346: return NULL;
347: }
348: return k;
1.5 markus 349: sc_close();
1.1 markus 350: }
351: #endif
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