Annotation of src/usr.bin/ssh/scard.c, Revision 1.18
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"
1.18 ! markus 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:
1.18 ! markus 37: #ifdef OPENSSL_VERSION_NUMBER
! 38: #if OPENSSL_VERSION_NUMBER >= 0x00907000L
! 39: #define RSA_get_default_openssl_method RSA_get_default_method
! 40: #define DSA_get_default_openssl_method DSA_get_default_method
! 41: #define DH_get_default_openssl_method DH_get_default_method
! 42: #define ENGINE_set_BN_mod_exp(x,y)
! 43: #endif
! 44: #endif
! 45:
1.1 markus 46: #define CLA_SSH 0x05
47: #define INS_DECRYPT 0x10
48: #define INS_GET_KEYLENGTH 0x20
49: #define INS_GET_PUBKEY 0x30
50: #define INS_GET_RESPONSE 0xc0
51:
52: #define MAX_BUF_SIZE 256
53:
54: static int sc_fd = -1;
1.11 markus 55: static char *sc_reader_id = NULL;
1.1 markus 56: static int cla = 0x00; /* class */
57:
58: /* interface to libsectok */
59:
1.16 deraadt 60: static int
1.5 markus 61: sc_open(void)
1.1 markus 62: {
1.4 markus 63: int sw;
1.1 markus 64:
65: if (sc_fd >= 0)
66: return sc_fd;
67:
1.11 markus 68: sc_fd = sectok_friendly_open(sc_reader_id, STONOWAIT, &sw);
1.1 markus 69: if (sc_fd < 0) {
1.5 markus 70: error("sectok_open failed: %s", sectok_get_sw(sw));
1.8 jakob 71: return SCARD_ERROR_FAIL;
72: }
73: if (! sectok_cardpresent(sc_fd)) {
1.11 markus 74: debug("smartcard in reader %s not present, skipping",
75: sc_reader_id);
1.10 jakob 76: sc_close();
1.8 jakob 77: return SCARD_ERROR_NOCARD;
1.1 markus 78: }
1.7 rees 79: if (sectok_reset(sc_fd, 0, NULL, &sw) <= 0) {
1.4 markus 80: error("sectok_reset failed: %s", sectok_get_sw(sw));
1.1 markus 81: sc_fd = -1;
1.8 jakob 82: return SCARD_ERROR_FAIL;
1.1 markus 83: }
1.7 rees 84: if ((cla = cyberflex_inq_class(sc_fd)) < 0)
85: cla = 0;
1.5 markus 86:
1.4 markus 87: debug("sc_open ok %d", sc_fd);
1.1 markus 88: return sc_fd;
89: }
90:
1.16 deraadt 91: static int
1.4 markus 92: sc_enable_applet(void)
1.1 markus 93: {
1.7 rees 94: static u_char aid[] = {0xfc, 0x53, 0x73, 0x68, 0x2e, 0x62, 0x69, 0x6e};
95: int sw = 0;
1.1 markus 96:
1.7 rees 97: /* select applet id */
98: sectok_apdu(sc_fd, cla, 0xa4, 0x04, 0, sizeof aid, aid, 0, NULL, &sw);
1.4 markus 99: if (!sectok_swOK(sw)) {
100: error("sectok_apdu failed: %s", sectok_get_sw(sw));
1.5 markus 101: sc_close();
102: return -1;
103: }
104: return 0;
105: }
106:
1.16 deraadt 107: static int
1.5 markus 108: sc_init(void)
109: {
1.8 jakob 110: int status;
111:
112: status = sc_open();
113: if (status == SCARD_ERROR_NOCARD) {
114: return SCARD_ERROR_NOCARD;
115: }
116: if (status < 0 ) {
1.5 markus 117: error("sc_open failed");
1.8 jakob 118: return status;
1.5 markus 119: }
120: if (sc_enable_applet() < 0) {
121: error("sc_enable_applet failed");
1.8 jakob 122: return SCARD_ERROR_APPLET;
1.1 markus 123: }
124: return 0;
125: }
126:
1.16 deraadt 127: static int
1.1 markus 128: sc_read_pubkey(Key * k)
129: {
1.4 markus 130: u_char buf[2], *n;
131: char *p;
1.14 markus 132: int len, sw, status = -1;
1.1 markus 133:
1.4 markus 134: len = sw = 0;
1.15 djm 135: n = NULL;
1.1 markus 136:
1.8 jakob 137: if (sc_fd < 0) {
138: status = sc_init();
139: if (status < 0 )
1.14 markus 140: goto err;
1.8 jakob 141: }
1.5 markus 142:
1.1 markus 143: /* get key size */
1.4 markus 144: sectok_apdu(sc_fd, CLA_SSH, INS_GET_KEYLENGTH, 0, 0, 0, NULL,
1.16 deraadt 145: sizeof(buf), buf, &sw);
1.4 markus 146: if (!sectok_swOK(sw)) {
147: error("could not obtain key length: %s", sectok_get_sw(sw));
1.14 markus 148: goto err;
1.1 markus 149: }
150: len = (buf[0] << 8) | buf[1];
151: len /= 8;
1.4 markus 152: debug("INS_GET_KEYLENGTH: len %d sw %s", len, sectok_get_sw(sw));
1.1 markus 153:
1.4 markus 154: n = xmalloc(len);
1.1 markus 155: /* get n */
1.4 markus 156: sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
157: if (!sectok_swOK(sw)) {
158: error("could not obtain public key: %s", sectok_get_sw(sw));
1.14 markus 159: goto err;
1.1 markus 160: }
1.14 markus 161:
1.4 markus 162: debug("INS_GET_KEYLENGTH: sw %s", sectok_get_sw(sw));
163:
164: if (BN_bin2bn(n, len, k->rsa->n) == NULL) {
165: error("c_read_pubkey: BN_bin2bn failed");
1.14 markus 166: goto err;
1.4 markus 167: }
1.1 markus 168:
169: /* currently the java applet just stores 'n' */
1.4 markus 170: if (!BN_set_word(k->rsa->e, 35)) {
171: error("c_read_pubkey: BN_set_word(e, 35) failed");
1.14 markus 172: goto err;
1.4 markus 173: }
1.1 markus 174:
1.14 markus 175: status = 0;
1.1 markus 176: p = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
177: debug("fingerprint %d %s", key_size(k), p);
178: xfree(p);
179:
1.14 markus 180: err:
181: if (n != NULL)
182: xfree(n);
183: sc_close();
184: return status;
1.1 markus 185: }
186:
187: /* private key operations */
188:
189: static int
1.18 ! markus 190: sc_private_decrypt(int flen, const u_char *from, u_char *to, RSA *rsa,
! 191: int padding)
1.1 markus 192: {
1.4 markus 193: u_char *padded = NULL;
1.14 markus 194: int sw, len, olen, status = -1;
1.1 markus 195:
196: debug("sc_private_decrypt called");
197:
1.4 markus 198: olen = len = sw = 0;
1.8 jakob 199: if (sc_fd < 0) {
200: status = sc_init();
201: if (status < 0 )
1.5 markus 202: goto err;
1.8 jakob 203: }
1.4 markus 204: if (padding != RSA_PKCS1_PADDING)
1.1 markus 205: goto err;
206:
1.4 markus 207: len = BN_num_bytes(rsa->n);
208: padded = xmalloc(len);
1.1 markus 209:
1.18 ! markus 210: sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, (u_char *)from,
! 211: 0, NULL, &sw);
1.4 markus 212: if (!sectok_swOK(sw)) {
213: error("sc_private_decrypt: INS_DECRYPT failed: %s",
214: sectok_get_sw(sw));
1.1 markus 215: goto err;
216: }
1.4 markus 217: sectok_apdu(sc_fd, CLA_SSH, INS_GET_RESPONSE, 0, 0, 0, NULL,
1.16 deraadt 218: len, padded, &sw);
1.4 markus 219: if (!sectok_swOK(sw)) {
220: error("sc_private_decrypt: INS_GET_RESPONSE failed: %s",
221: sectok_get_sw(sw));
1.1 markus 222: goto err;
223: }
1.4 markus 224: olen = RSA_padding_check_PKCS1_type_2(to, len, padded + 1, len - 1,
225: len);
1.1 markus 226: err:
227: if (padded)
228: xfree(padded);
1.14 markus 229: sc_close();
1.8 jakob 230: return (olen >= 0 ? olen : status);
1.1 markus 231: }
232:
233: static int
1.18 ! markus 234: sc_private_encrypt(int flen, const u_char *from, u_char *to, RSA *rsa,
! 235: int padding)
1.1 markus 236: {
1.4 markus 237: u_char *padded = NULL;
1.14 markus 238: int sw, len, status = -1;
1.1 markus 239:
1.4 markus 240: len = sw = 0;
1.8 jakob 241: if (sc_fd < 0) {
242: status = sc_init();
243: if (status < 0 )
1.5 markus 244: goto err;
1.8 jakob 245: }
1.4 markus 246: if (padding != RSA_PKCS1_PADDING)
1.1 markus 247: goto err;
248:
1.3 markus 249: debug("sc_private_encrypt called");
1.4 markus 250: len = BN_num_bytes(rsa->n);
251: padded = xmalloc(len);
252:
1.18 ! markus 253: if (RSA_padding_add_PKCS1_type_1(padded, len, (u_char *)from, flen) <= 0) {
1.1 markus 254: error("RSA_padding_add_PKCS1_type_1 failed");
255: goto err;
256: }
1.4 markus 257: sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, 0, NULL, &sw);
258: if (!sectok_swOK(sw)) {
259: error("sc_private_decrypt: INS_DECRYPT failed: %s",
260: sectok_get_sw(sw));
261: goto err;
262: }
263: sectok_apdu(sc_fd, CLA_SSH, INS_GET_RESPONSE, 0, 0, 0, NULL,
1.16 deraadt 264: len, to, &sw);
1.4 markus 265: if (!sectok_swOK(sw)) {
266: error("sc_private_decrypt: INS_GET_RESPONSE failed: %s",
267: sectok_get_sw(sw));
268: goto err;
1.1 markus 269: }
270: err:
271: if (padded)
272: xfree(padded);
1.14 markus 273: sc_close();
1.8 jakob 274: return (len >= 0 ? len : status);
1.1 markus 275: }
276:
1.12 markus 277: /* called on free */
278:
279: static int (*orig_finish)(RSA *rsa) = NULL;
280:
281: static int
282: sc_finish(RSA *rsa)
283: {
284: if (orig_finish)
285: orig_finish(rsa);
286: sc_close();
287: return 1;
288: }
289:
290:
1.1 markus 291: /* engine for overloading private key operations */
292:
293: static ENGINE *smart_engine = NULL;
1.18 ! markus 294: static RSA_METHOD smart_rsa;
1.1 markus 295:
296: ENGINE *
1.2 itojun 297: sc_get_engine(void)
1.1 markus 298: {
1.18 ! markus 299: const RSA_METHOD *def;
1.1 markus 300:
301: def = RSA_get_default_openssl_method();
302:
1.18 ! markus 303: /* use the OpenSSL version */
! 304: memcpy(&smart_rsa, def, sizeof(smart_rsa));
! 305:
! 306: smart_rsa.name = "sectok";
! 307:
1.1 markus 308: /* overload */
309: smart_rsa.rsa_priv_enc = sc_private_encrypt;
310: smart_rsa.rsa_priv_dec = sc_private_decrypt;
311:
1.12 markus 312: /* save original */
313: orig_finish = def->finish;
314: smart_rsa.finish = sc_finish;
315:
1.17 markus 316: if ((smart_engine = ENGINE_new()) == NULL)
317: fatal("ENGINE_new failed");
1.1 markus 318:
1.4 markus 319: ENGINE_set_id(smart_engine, "sectok");
320: ENGINE_set_name(smart_engine, "libsectok");
1.18 ! markus 321:
1.1 markus 322: ENGINE_set_RSA(smart_engine, &smart_rsa);
323: ENGINE_set_DSA(smart_engine, DSA_get_default_openssl_method());
324: ENGINE_set_DH(smart_engine, DH_get_default_openssl_method());
325: ENGINE_set_RAND(smart_engine, RAND_SSLeay());
326: ENGINE_set_BN_mod_exp(smart_engine, BN_mod_exp);
327:
328: return smart_engine;
329: }
330:
1.5 markus 331: void
332: sc_close(void)
333: {
334: if (sc_fd >= 0) {
335: sectok_close(sc_fd);
336: sc_fd = -1;
337: }
338: }
339:
1.1 markus 340: Key *
1.11 markus 341: sc_get_key(const char *id)
1.1 markus 342: {
343: Key *k;
1.9 jakob 344: int status;
1.1 markus 345:
1.11 markus 346: if (sc_reader_id != NULL)
347: xfree(sc_reader_id);
348: sc_reader_id = xstrdup(id);
349:
1.1 markus 350: k = key_new(KEY_RSA);
351: if (k == NULL) {
352: return NULL;
353: }
1.9 jakob 354: status = sc_read_pubkey(k);
355: if (status == SCARD_ERROR_NOCARD) {
356: key_free(k);
357: return NULL;
358: }
359: if (status < 0 ) {
1.1 markus 360: error("sc_read_pubkey failed");
361: key_free(k);
362: return NULL;
363: }
364: return k;
365: }
1.13 jakob 366: #endif /* SMARTCARD */
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