Annotation of src/usr.bin/ssh/scard.c, Revision 1.15.2.1
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"
1.15.2.1! jason 27: RCSID("$OpenBSD: scard.c,v 1.17 2001/12/27 18:22:16 markus 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;
1.11 markus 46: static char *sc_reader_id = NULL;
1.1 markus 47: static int cla = 0x00; /* class */
48:
49: /* interface to libsectok */
50:
1.15.2.1! jason 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:
1.11 markus 59: sc_fd = sectok_friendly_open(sc_reader_id, 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)) {
1.11 markus 65: debug("smartcard in reader %s not present, skipping",
66: sc_reader_id);
1.10 jakob 67: sc_close();
1.8 jakob 68: return SCARD_ERROR_NOCARD;
1.1 markus 69: }
1.7 rees 70: if (sectok_reset(sc_fd, 0, NULL, &sw) <= 0) {
1.4 markus 71: error("sectok_reset failed: %s", sectok_get_sw(sw));
1.1 markus 72: sc_fd = -1;
1.8 jakob 73: return SCARD_ERROR_FAIL;
1.1 markus 74: }
1.7 rees 75: if ((cla = cyberflex_inq_class(sc_fd)) < 0)
76: cla = 0;
1.5 markus 77:
1.4 markus 78: debug("sc_open ok %d", sc_fd);
1.1 markus 79: return sc_fd;
80: }
81:
1.15.2.1! jason 82: static int
1.4 markus 83: sc_enable_applet(void)
1.1 markus 84: {
1.7 rees 85: static u_char aid[] = {0xfc, 0x53, 0x73, 0x68, 0x2e, 0x62, 0x69, 0x6e};
86: int sw = 0;
1.1 markus 87:
1.7 rees 88: /* select applet id */
89: sectok_apdu(sc_fd, cla, 0xa4, 0x04, 0, sizeof aid, aid, 0, NULL, &sw);
1.4 markus 90: if (!sectok_swOK(sw)) {
91: error("sectok_apdu failed: %s", sectok_get_sw(sw));
1.5 markus 92: sc_close();
93: return -1;
94: }
95: return 0;
96: }
97:
1.15.2.1! jason 98: static int
1.5 markus 99: sc_init(void)
100: {
1.8 jakob 101: int status;
102:
103: status = sc_open();
104: if (status == SCARD_ERROR_NOCARD) {
105: return SCARD_ERROR_NOCARD;
106: }
107: if (status < 0 ) {
1.5 markus 108: error("sc_open failed");
1.8 jakob 109: return status;
1.5 markus 110: }
111: if (sc_enable_applet() < 0) {
112: error("sc_enable_applet failed");
1.8 jakob 113: return SCARD_ERROR_APPLET;
1.1 markus 114: }
115: return 0;
116: }
117:
1.15.2.1! jason 118: static int
1.1 markus 119: sc_read_pubkey(Key * k)
120: {
1.4 markus 121: u_char buf[2], *n;
122: char *p;
1.14 markus 123: int len, sw, status = -1;
1.1 markus 124:
1.4 markus 125: len = sw = 0;
1.15 djm 126: n = NULL;
1.1 markus 127:
1.8 jakob 128: if (sc_fd < 0) {
129: status = sc_init();
130: if (status < 0 )
1.14 markus 131: goto err;
1.8 jakob 132: }
1.5 markus 133:
1.1 markus 134: /* get key size */
1.4 markus 135: sectok_apdu(sc_fd, CLA_SSH, INS_GET_KEYLENGTH, 0, 0, 0, NULL,
1.15.2.1! jason 136: sizeof(buf), buf, &sw);
1.4 markus 137: if (!sectok_swOK(sw)) {
138: error("could not obtain key length: %s", sectok_get_sw(sw));
1.14 markus 139: goto err;
1.1 markus 140: }
141: len = (buf[0] << 8) | buf[1];
142: len /= 8;
1.4 markus 143: debug("INS_GET_KEYLENGTH: len %d sw %s", len, sectok_get_sw(sw));
1.1 markus 144:
1.4 markus 145: n = xmalloc(len);
1.1 markus 146: /* get n */
1.4 markus 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));
1.14 markus 150: goto err;
1.1 markus 151: }
1.14 markus 152:
1.4 markus 153: debug("INS_GET_KEYLENGTH: sw %s", sectok_get_sw(sw));
154:
155: if (BN_bin2bn(n, len, k->rsa->n) == NULL) {
156: error("c_read_pubkey: BN_bin2bn failed");
1.14 markus 157: goto err;
1.4 markus 158: }
1.1 markus 159:
160: /* currently the java applet just stores 'n' */
1.4 markus 161: if (!BN_set_word(k->rsa->e, 35)) {
162: error("c_read_pubkey: BN_set_word(e, 35) failed");
1.14 markus 163: goto err;
1.4 markus 164: }
1.1 markus 165:
1.14 markus 166: status = 0;
1.1 markus 167: p = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
168: debug("fingerprint %d %s", key_size(k), p);
169: xfree(p);
170:
1.14 markus 171: err:
172: if (n != NULL)
173: xfree(n);
174: sc_close();
175: return status;
1.1 markus 176: }
177:
178: /* private key operations */
179:
180: static int
1.4 markus 181: sc_private_decrypt(int flen, u_char *from, u_char *to, RSA *rsa, int padding)
1.1 markus 182: {
1.4 markus 183: u_char *padded = NULL;
1.14 markus 184: int sw, len, olen, status = -1;
1.1 markus 185:
186: debug("sc_private_decrypt called");
187:
1.4 markus 188: olen = len = sw = 0;
1.8 jakob 189: if (sc_fd < 0) {
190: status = sc_init();
191: if (status < 0 )
1.5 markus 192: goto err;
1.8 jakob 193: }
1.4 markus 194: if (padding != RSA_PKCS1_PADDING)
1.1 markus 195: goto err;
196:
1.4 markus 197: len = BN_num_bytes(rsa->n);
198: padded = xmalloc(len);
1.1 markus 199:
1.4 markus 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",
203: sectok_get_sw(sw));
1.1 markus 204: goto err;
205: }
1.4 markus 206: sectok_apdu(sc_fd, CLA_SSH, INS_GET_RESPONSE, 0, 0, 0, NULL,
1.15.2.1! jason 207: len, padded, &sw);
1.4 markus 208: if (!sectok_swOK(sw)) {
209: error("sc_private_decrypt: INS_GET_RESPONSE failed: %s",
210: sectok_get_sw(sw));
1.1 markus 211: goto err;
212: }
1.4 markus 213: olen = RSA_padding_check_PKCS1_type_2(to, len, padded + 1, len - 1,
214: len);
1.1 markus 215: err:
216: if (padded)
217: xfree(padded);
1.14 markus 218: sc_close();
1.8 jakob 219: return (olen >= 0 ? olen : status);
1.1 markus 220: }
221:
222: static int
1.4 markus 223: sc_private_encrypt(int flen, u_char *from, u_char *to, RSA *rsa, int padding)
1.1 markus 224: {
1.4 markus 225: u_char *padded = NULL;
1.14 markus 226: int sw, len, status = -1;
1.1 markus 227:
1.4 markus 228: len = sw = 0;
1.8 jakob 229: if (sc_fd < 0) {
230: status = sc_init();
231: if (status < 0 )
1.5 markus 232: goto err;
1.8 jakob 233: }
1.4 markus 234: if (padding != RSA_PKCS1_PADDING)
1.1 markus 235: goto err;
236:
1.3 markus 237: debug("sc_private_encrypt called");
1.4 markus 238: len = BN_num_bytes(rsa->n);
239: padded = xmalloc(len);
240:
241: if (RSA_padding_add_PKCS1_type_1(padded, len, from, flen) <= 0) {
1.1 markus 242: error("RSA_padding_add_PKCS1_type_1 failed");
243: goto err;
244: }
1.4 markus 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",
248: sectok_get_sw(sw));
249: goto err;
250: }
251: sectok_apdu(sc_fd, CLA_SSH, INS_GET_RESPONSE, 0, 0, 0, NULL,
1.15.2.1! jason 252: len, to, &sw);
1.4 markus 253: if (!sectok_swOK(sw)) {
254: error("sc_private_decrypt: INS_GET_RESPONSE failed: %s",
255: sectok_get_sw(sw));
256: goto err;
1.1 markus 257: }
258: err:
259: if (padded)
260: xfree(padded);
1.14 markus 261: sc_close();
1.8 jakob 262: return (len >= 0 ? len : status);
1.1 markus 263: }
264:
1.12 markus 265: /* called on free */
266:
267: static int (*orig_finish)(RSA *rsa) = NULL;
268:
269: static int
270: sc_finish(RSA *rsa)
271: {
272: if (orig_finish)
273: orig_finish(rsa);
274: sc_close();
275: return 1;
276: }
277:
278:
1.1 markus 279: /* engine for overloading private key operations */
280:
281: static ENGINE *smart_engine = NULL;
282: static RSA_METHOD smart_rsa =
283: {
1.4 markus 284: "sectok",
285: NULL,
286: NULL,
287: NULL,
288: NULL,
289: NULL,
290: NULL,
291: NULL,
292: NULL,
293: 0,
294: NULL,
1.1 markus 295: };
296:
297: ENGINE *
1.2 itojun 298: sc_get_engine(void)
1.1 markus 299: {
300: RSA_METHOD *def;
301:
302: def = RSA_get_default_openssl_method();
303:
304: /* overload */
305: smart_rsa.rsa_priv_enc = sc_private_encrypt;
306: smart_rsa.rsa_priv_dec = sc_private_decrypt;
307:
1.12 markus 308: /* save original */
309: orig_finish = def->finish;
310: smart_rsa.finish = sc_finish;
311:
1.1 markus 312: /* just use the OpenSSL version */
1.4 markus 313: smart_rsa.rsa_pub_enc = def->rsa_pub_enc;
314: smart_rsa.rsa_pub_dec = def->rsa_pub_dec;
1.1 markus 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;
322:
1.15.2.1! jason 323: if ((smart_engine = ENGINE_new()) == NULL)
! 324: fatal("ENGINE_new failed");
1.1 markus 325:
1.4 markus 326: ENGINE_set_id(smart_engine, "sectok");
327: ENGINE_set_name(smart_engine, "libsectok");
1.1 markus 328: ENGINE_set_RSA(smart_engine, &smart_rsa);
329: ENGINE_set_DSA(smart_engine, DSA_get_default_openssl_method());
330: ENGINE_set_DH(smart_engine, DH_get_default_openssl_method());
331: ENGINE_set_RAND(smart_engine, RAND_SSLeay());
332: ENGINE_set_BN_mod_exp(smart_engine, BN_mod_exp);
333:
334: return smart_engine;
335: }
336:
1.5 markus 337: void
338: sc_close(void)
339: {
340: if (sc_fd >= 0) {
341: sectok_close(sc_fd);
342: sc_fd = -1;
343: }
344: }
345:
1.1 markus 346: Key *
1.11 markus 347: sc_get_key(const char *id)
1.1 markus 348: {
349: Key *k;
1.9 jakob 350: int status;
1.1 markus 351:
1.11 markus 352: if (sc_reader_id != NULL)
353: xfree(sc_reader_id);
354: sc_reader_id = xstrdup(id);
355:
1.1 markus 356: k = key_new(KEY_RSA);
357: if (k == NULL) {
358: return NULL;
359: }
1.9 jakob 360: status = sc_read_pubkey(k);
361: if (status == SCARD_ERROR_NOCARD) {
362: key_free(k);
363: return NULL;
364: }
365: if (status < 0 ) {
1.1 markus 366: error("sc_read_pubkey failed");
367: key_free(k);
368: return NULL;
369: }
370: return k;
371: }
1.13 jakob 372: #endif /* SMARTCARD */
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