Annotation of src/usr.bin/ssh/scard.c, Revision 1.5
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"
1.5 ! markus 27: RCSID("$OpenBSD: scard.c,v 1.4 2001/07/02 22:40:17 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;
1.5 ! 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: {
54: u_char atr[256];
1.4 markus 55: int sw;
1.1 markus 56:
57: if (sc_fd >= 0)
58: return sc_fd;
59:
1.5 ! markus 60: sc_fd = sectok_open(sc_reader_num, 0, &sw);
1.1 markus 61: if (sc_fd < 0) {
1.5 ! markus 62: error("sectok_open failed: %s", sectok_get_sw(sw));
! 63: return -1;
1.1 markus 64: }
1.4 markus 65: if (sectok_reset(sc_fd, 0, atr, &sw) <= 0) {
66: error("sectok_reset failed: %s", sectok_get_sw(sw));
1.1 markus 67: sc_fd = -1;
68: return sc_fd;
69: }
1.5 ! markus 70:
1.4 markus 71: debug("sc_open ok %d", sc_fd);
1.1 markus 72: return sc_fd;
73: }
74:
75: static int
1.4 markus 76: sc_enable_applet(void)
1.1 markus 77: {
1.4 markus 78: u_char contID[2], aid[MAX_BUF_SIZE];
79: int i, len, sw, aid_len;
1.1 markus 80:
1.4 markus 81: len = sw = 0;
1.1 markus 82: contID[0] = 0x77;
83: contID[1] = 0x78;
84:
1.4 markus 85: if (sectok_selectfile(sc_fd, cla, root_fid, &sw) < 0) {
86: error("sectok_selectfile root_fid failed: %s",
87: sectok_get_sw(sw));
1.5 ! markus 88: sc_close();
1.1 markus 89: return -1;
90: }
1.4 markus 91: if (sectok_selectfile(sc_fd, cla, contID, &sw) < 0) {
92: error("sectok_selectfile failed: %s", sectok_get_sw(sw));
1.5 ! markus 93: sc_close();
1.4 markus 94: return -1;
95: }
96: /* send appled id */
97: for (i = 0; i < sizeof(aid); i++)
98: aid[i] = 0x77;
99: aid_len = 5;
100: sectok_apdu(sc_fd, cla, 0xa4, 0x04, 0, aid_len, aid, 0, NULL, &sw);
101: if (!sectok_swOK(sw)) {
102: error("sectok_apdu failed: %s", sectok_get_sw(sw));
1.5 ! markus 103: sc_close();
! 104: return -1;
! 105: }
! 106: return 0;
! 107: }
! 108:
! 109: static int
! 110: sc_init(void)
! 111: {
! 112: if (sc_open() < 0) {
! 113: error("sc_open failed");
! 114: return -1;
! 115: }
! 116: if (sc_enable_applet() < 0) {
! 117: error("sc_enable_applet failed");
1.1 markus 118: return -1;
119: }
120: return 0;
121: }
122:
123: static int
124: sc_read_pubkey(Key * k)
125: {
1.4 markus 126: u_char buf[2], *n;
127: char *p;
128: int len, sw;
1.1 markus 129:
1.4 markus 130: len = sw = 0;
1.1 markus 131:
1.5 ! markus 132: if (sc_fd < 0)
! 133: if (sc_init() < 0)
! 134: return -1;
! 135:
1.1 markus 136: /* get key size */
1.4 markus 137: sectok_apdu(sc_fd, CLA_SSH, INS_GET_KEYLENGTH, 0, 0, 0, NULL,
138: sizeof(buf), buf, &sw);
139: if (!sectok_swOK(sw)) {
140: error("could not obtain key length: %s", sectok_get_sw(sw));
1.5 ! markus 141: sc_close();
1.4 markus 142: return -1;
1.1 markus 143: }
144: len = (buf[0] << 8) | buf[1];
145: len /= 8;
1.4 markus 146: debug("INS_GET_KEYLENGTH: len %d sw %s", len, sectok_get_sw(sw));
1.1 markus 147:
1.4 markus 148: n = xmalloc(len);
1.1 markus 149: /* get n */
1.4 markus 150: sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
151: if (!sectok_swOK(sw)) {
152: error("could not obtain public key: %s", sectok_get_sw(sw));
153: xfree(n);
154: return -1;
1.1 markus 155: }
1.4 markus 156: debug("INS_GET_KEYLENGTH: sw %s", sectok_get_sw(sw));
157:
158: if (BN_bin2bn(n, len, k->rsa->n) == NULL) {
159: error("c_read_pubkey: BN_bin2bn failed");
160: xfree(n);
1.5 ! markus 161: sc_close();
1.4 markus 162: return -1;
163: }
164: xfree(n);
1.1 markus 165:
166: /* currently the java applet just stores 'n' */
1.4 markus 167: if (!BN_set_word(k->rsa->e, 35)) {
168: error("c_read_pubkey: BN_set_word(e, 35) failed");
169: return -1;
170: }
1.1 markus 171:
172: p = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
173: debug("fingerprint %d %s", key_size(k), p);
174: xfree(p);
175:
176: return 0;
177: }
178:
179: /* private key operations */
180:
181: static int
1.4 markus 182: sc_private_decrypt(int flen, u_char *from, u_char *to, RSA *rsa, int padding)
1.1 markus 183: {
1.4 markus 184: u_char *padded = NULL;
185: int sw, len, olen;
1.1 markus 186:
187: debug("sc_private_decrypt called");
188:
1.4 markus 189: olen = len = sw = 0;
1.5 ! markus 190: if (sc_fd < 0)
! 191: if (sc_init() < 0)
! 192: goto err;
1.4 markus 193: if (padding != RSA_PKCS1_PADDING)
1.1 markus 194: goto err;
195:
1.4 markus 196: len = BN_num_bytes(rsa->n);
197: padded = xmalloc(len);
1.1 markus 198:
1.4 markus 199: sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, 0, NULL, &sw);
200: if (!sectok_swOK(sw)) {
201: error("sc_private_decrypt: INS_DECRYPT failed: %s",
202: sectok_get_sw(sw));
1.5 ! markus 203: sc_close();
1.1 markus 204: goto err;
205: }
1.4 markus 206: sectok_apdu(sc_fd, CLA_SSH, INS_GET_RESPONSE, 0, 0, 0, NULL,
207: len, padded, &sw);
208: if (!sectok_swOK(sw)) {
209: error("sc_private_decrypt: INS_GET_RESPONSE failed: %s",
210: sectok_get_sw(sw));
1.5 ! markus 211: sc_close();
1.1 markus 212: goto err;
213: }
1.4 markus 214: olen = RSA_padding_check_PKCS1_type_2(to, len, padded + 1, len - 1,
215: len);
1.1 markus 216: err:
217: if (padded)
218: xfree(padded);
219: return olen;
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;
226: int sw, len;
1.1 markus 227:
1.4 markus 228: len = sw = 0;
1.5 ! markus 229: if (sc_fd < 0)
! 230: if (sc_init() < 0)
! 231: goto err;
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);
1.4 markus 261: return len;
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;
331:
1.5 ! markus 332: sc_reader_num = num;
1.1 markus 333: k = key_new(KEY_RSA);
334: if (k == NULL) {
335: return NULL;
336: }
1.4 markus 337: if (sc_read_pubkey(k) < 0) {
1.1 markus 338: error("sc_read_pubkey failed");
339: key_free(k);
340: return NULL;
341: }
342: return k;
1.5 ! markus 343: sc_close();
1.1 markus 344: }
345: #endif
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