Annotation of src/usr.bin/ssh/scard.c, Revision 1.33
1.33 ! stevesk 1: /* $OpenBSD: scard.c,v 1.32 2006/03/25 13:17:02 djm Exp $ */
1.1 markus 2: /*
3: * Copyright (c) 2001 Markus Friedl. All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: *
14: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24: */
25:
26: #ifdef SMARTCARD
27: #include "includes.h"
28:
1.19 markus 29: #include <openssl/evp.h>
1.33 ! stevesk 30:
1.1 markus 31: #include <sectok.h>
1.33 ! stevesk 32: #include <string.h>
1.1 markus 33:
34: #include "key.h"
35: #include "log.h"
36: #include "xmalloc.h"
1.29 djm 37: #include "misc.h"
1.1 markus 38: #include "scard.h"
39:
1.24 markus 40: #if OPENSSL_VERSION_NUMBER < 0x00907000L
41: #define USE_ENGINE
42: #define RSA_get_default_method RSA_get_default_openssl_method
43: #else
1.18 markus 44: #endif
1.24 markus 45:
46: #ifdef USE_ENGINE
47: #include <openssl/engine.h>
48: #define sc_get_rsa sc_get_engine
49: #else
50: #define sc_get_rsa sc_get_rsa_method
1.18 markus 51: #endif
52:
1.1 markus 53: #define CLA_SSH 0x05
54: #define INS_DECRYPT 0x10
55: #define INS_GET_KEYLENGTH 0x20
56: #define INS_GET_PUBKEY 0x30
57: #define INS_GET_RESPONSE 0xc0
58:
59: #define MAX_BUF_SIZE 256
60:
1.22 rees 61: u_char DEFAUT0[] = {0xad, 0x9f, 0x61, 0xfe, 0xfa, 0x20, 0xce, 0x63};
62:
1.1 markus 63: static int sc_fd = -1;
1.11 markus 64: static char *sc_reader_id = NULL;
1.22 rees 65: static char *sc_pin = NULL;
1.1 markus 66: static int cla = 0x00; /* class */
67:
1.22 rees 68: static void sc_mk_digest(const char *pin, u_char *digest);
69: static int get_AUT0(u_char *aut0);
1.25 rees 70: static int try_AUT0(void);
1.22 rees 71:
1.1 markus 72: /* interface to libsectok */
73:
1.16 deraadt 74: static int
1.5 markus 75: sc_open(void)
1.1 markus 76: {
1.4 markus 77: int sw;
1.1 markus 78:
79: if (sc_fd >= 0)
80: return sc_fd;
81:
1.11 markus 82: sc_fd = sectok_friendly_open(sc_reader_id, STONOWAIT, &sw);
1.1 markus 83: if (sc_fd < 0) {
1.5 markus 84: error("sectok_open failed: %s", sectok_get_sw(sw));
1.8 jakob 85: return SCARD_ERROR_FAIL;
86: }
87: if (! sectok_cardpresent(sc_fd)) {
1.11 markus 88: debug("smartcard in reader %s not present, skipping",
89: sc_reader_id);
1.10 jakob 90: sc_close();
1.8 jakob 91: return SCARD_ERROR_NOCARD;
1.1 markus 92: }
1.7 rees 93: if (sectok_reset(sc_fd, 0, NULL, &sw) <= 0) {
1.4 markus 94: error("sectok_reset failed: %s", sectok_get_sw(sw));
1.1 markus 95: sc_fd = -1;
1.8 jakob 96: return SCARD_ERROR_FAIL;
1.1 markus 97: }
1.7 rees 98: if ((cla = cyberflex_inq_class(sc_fd)) < 0)
99: cla = 0;
1.5 markus 100:
1.4 markus 101: debug("sc_open ok %d", sc_fd);
1.1 markus 102: return sc_fd;
103: }
104:
1.16 deraadt 105: static int
1.4 markus 106: sc_enable_applet(void)
1.1 markus 107: {
1.7 rees 108: static u_char aid[] = {0xfc, 0x53, 0x73, 0x68, 0x2e, 0x62, 0x69, 0x6e};
109: int sw = 0;
1.1 markus 110:
1.7 rees 111: /* select applet id */
112: sectok_apdu(sc_fd, cla, 0xa4, 0x04, 0, sizeof aid, aid, 0, NULL, &sw);
1.4 markus 113: if (!sectok_swOK(sw)) {
114: error("sectok_apdu failed: %s", sectok_get_sw(sw));
1.5 markus 115: sc_close();
116: return -1;
117: }
118: return 0;
119: }
120:
1.16 deraadt 121: static int
1.5 markus 122: sc_init(void)
123: {
1.8 jakob 124: int status;
125:
126: status = sc_open();
127: if (status == SCARD_ERROR_NOCARD) {
128: return SCARD_ERROR_NOCARD;
129: }
130: if (status < 0 ) {
1.5 markus 131: error("sc_open failed");
1.8 jakob 132: return status;
1.5 markus 133: }
134: if (sc_enable_applet() < 0) {
135: error("sc_enable_applet failed");
1.8 jakob 136: return SCARD_ERROR_APPLET;
1.1 markus 137: }
138: return 0;
139: }
140:
1.16 deraadt 141: static int
1.1 markus 142: sc_read_pubkey(Key * k)
143: {
1.4 markus 144: u_char buf[2], *n;
145: char *p;
1.14 markus 146: int len, sw, status = -1;
1.1 markus 147:
1.4 markus 148: len = sw = 0;
1.15 djm 149: n = NULL;
1.1 markus 150:
1.8 jakob 151: if (sc_fd < 0) {
1.24 markus 152: if (sc_init() < 0)
1.14 markus 153: goto err;
1.8 jakob 154: }
1.5 markus 155:
1.1 markus 156: /* get key size */
1.4 markus 157: sectok_apdu(sc_fd, CLA_SSH, INS_GET_KEYLENGTH, 0, 0, 0, NULL,
1.16 deraadt 158: sizeof(buf), buf, &sw);
1.4 markus 159: if (!sectok_swOK(sw)) {
160: error("could not obtain key length: %s", sectok_get_sw(sw));
1.14 markus 161: goto err;
1.1 markus 162: }
163: len = (buf[0] << 8) | buf[1];
164: len /= 8;
1.4 markus 165: debug("INS_GET_KEYLENGTH: len %d sw %s", len, sectok_get_sw(sw));
1.1 markus 166:
1.4 markus 167: n = xmalloc(len);
1.1 markus 168: /* get n */
1.4 markus 169: sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
1.25 rees 170:
171: if (sw == 0x6982) {
172: if (try_AUT0() < 0)
173: goto err;
174: sectok_apdu(sc_fd, CLA_SSH, INS_GET_PUBKEY, 0, 0, 0, NULL, len, n, &sw);
175: }
1.4 markus 176: if (!sectok_swOK(sw)) {
177: error("could not obtain public key: %s", sectok_get_sw(sw));
1.14 markus 178: goto err;
1.1 markus 179: }
1.14 markus 180:
1.4 markus 181: debug("INS_GET_KEYLENGTH: sw %s", sectok_get_sw(sw));
182:
183: if (BN_bin2bn(n, len, k->rsa->n) == NULL) {
184: error("c_read_pubkey: BN_bin2bn failed");
1.14 markus 185: goto err;
1.4 markus 186: }
1.1 markus 187:
188: /* currently the java applet just stores 'n' */
1.4 markus 189: if (!BN_set_word(k->rsa->e, 35)) {
190: error("c_read_pubkey: BN_set_word(e, 35) failed");
1.14 markus 191: goto err;
1.4 markus 192: }
1.1 markus 193:
1.14 markus 194: status = 0;
1.1 markus 195: p = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX);
1.26 deraadt 196: debug("fingerprint %u %s", key_size(k), p);
1.1 markus 197: xfree(p);
198:
1.14 markus 199: err:
200: if (n != NULL)
201: xfree(n);
202: sc_close();
203: return status;
1.1 markus 204: }
205:
206: /* private key operations */
207:
208: static int
1.20 markus 209: sc_private_decrypt(int flen, u_char *from, u_char *to, RSA *rsa,
1.18 markus 210: int padding)
1.1 markus 211: {
1.4 markus 212: u_char *padded = NULL;
1.14 markus 213: int sw, len, olen, status = -1;
1.1 markus 214:
215: debug("sc_private_decrypt called");
216:
1.4 markus 217: olen = len = sw = 0;
1.8 jakob 218: if (sc_fd < 0) {
219: status = sc_init();
220: if (status < 0 )
1.5 markus 221: goto err;
1.8 jakob 222: }
1.4 markus 223: if (padding != RSA_PKCS1_PADDING)
1.1 markus 224: goto err;
225:
1.4 markus 226: len = BN_num_bytes(rsa->n);
227: padded = xmalloc(len);
1.1 markus 228:
1.22 rees 229: sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, len, padded, &sw);
230:
231: if (sw == 0x6982) {
1.23 markus 232: if (try_AUT0() < 0)
233: goto err;
1.22 rees 234: sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, from, len, padded, &sw);
235: }
1.4 markus 236: if (!sectok_swOK(sw)) {
237: error("sc_private_decrypt: INS_DECRYPT failed: %s",
238: sectok_get_sw(sw));
1.1 markus 239: goto err;
240: }
1.4 markus 241: olen = RSA_padding_check_PKCS1_type_2(to, len, padded + 1, len - 1,
242: len);
1.1 markus 243: err:
244: if (padded)
245: xfree(padded);
1.14 markus 246: sc_close();
1.8 jakob 247: return (olen >= 0 ? olen : status);
1.1 markus 248: }
249:
250: static int
1.20 markus 251: sc_private_encrypt(int flen, u_char *from, u_char *to, RSA *rsa,
1.18 markus 252: int padding)
1.1 markus 253: {
1.4 markus 254: u_char *padded = NULL;
1.14 markus 255: int sw, len, status = -1;
1.1 markus 256:
1.4 markus 257: len = sw = 0;
1.8 jakob 258: if (sc_fd < 0) {
259: status = sc_init();
260: if (status < 0 )
1.5 markus 261: goto err;
1.8 jakob 262: }
1.4 markus 263: if (padding != RSA_PKCS1_PADDING)
1.1 markus 264: goto err;
265:
1.3 markus 266: debug("sc_private_encrypt called");
1.4 markus 267: len = BN_num_bytes(rsa->n);
268: padded = xmalloc(len);
269:
1.18 markus 270: if (RSA_padding_add_PKCS1_type_1(padded, len, (u_char *)from, flen) <= 0) {
1.1 markus 271: error("RSA_padding_add_PKCS1_type_1 failed");
272: goto err;
273: }
1.22 rees 274: sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, len, to, &sw);
1.23 markus 275: if (sw == 0x6982) {
276: if (try_AUT0() < 0)
277: goto err;
278: sectok_apdu(sc_fd, CLA_SSH, INS_DECRYPT, 0, 0, len, padded, len, to, &sw);
279: }
1.4 markus 280: if (!sectok_swOK(sw)) {
1.23 markus 281: error("sc_private_encrypt: INS_DECRYPT failed: %s",
1.4 markus 282: sectok_get_sw(sw));
283: goto err;
284: }
1.1 markus 285: err:
286: if (padded)
287: xfree(padded);
1.14 markus 288: sc_close();
1.8 jakob 289: return (len >= 0 ? len : status);
1.1 markus 290: }
291:
1.12 markus 292: /* called on free */
293:
294: static int (*orig_finish)(RSA *rsa) = NULL;
295:
296: static int
297: sc_finish(RSA *rsa)
298: {
299: if (orig_finish)
300: orig_finish(rsa);
301: sc_close();
302: return 1;
303: }
304:
1.1 markus 305: /* engine for overloading private key operations */
306:
1.24 markus 307: static RSA_METHOD *
308: sc_get_rsa_method(void)
1.1 markus 309: {
1.24 markus 310: static RSA_METHOD smart_rsa;
311: const RSA_METHOD *def = RSA_get_default_method();
1.1 markus 312:
1.18 markus 313: /* use the OpenSSL version */
314: memcpy(&smart_rsa, def, sizeof(smart_rsa));
315:
316: smart_rsa.name = "sectok";
317:
1.1 markus 318: /* overload */
319: smart_rsa.rsa_priv_enc = sc_private_encrypt;
320: smart_rsa.rsa_priv_dec = sc_private_decrypt;
321:
1.12 markus 322: /* save original */
323: orig_finish = def->finish;
324: smart_rsa.finish = sc_finish;
325:
1.24 markus 326: return &smart_rsa;
327: }
328:
329: #ifdef USE_ENGINE
330: static ENGINE *
331: sc_get_engine(void)
332: {
333: static ENGINE *smart_engine = NULL;
334:
1.17 markus 335: if ((smart_engine = ENGINE_new()) == NULL)
336: fatal("ENGINE_new failed");
1.1 markus 337:
1.4 markus 338: ENGINE_set_id(smart_engine, "sectok");
339: ENGINE_set_name(smart_engine, "libsectok");
1.18 markus 340:
1.24 markus 341: ENGINE_set_RSA(smart_engine, sc_get_rsa_method());
1.1 markus 342: ENGINE_set_DSA(smart_engine, DSA_get_default_openssl_method());
343: ENGINE_set_DH(smart_engine, DH_get_default_openssl_method());
344: ENGINE_set_RAND(smart_engine, RAND_SSLeay());
345: ENGINE_set_BN_mod_exp(smart_engine, BN_mod_exp);
346:
347: return smart_engine;
348: }
1.24 markus 349: #endif
1.1 markus 350:
1.5 markus 351: void
352: sc_close(void)
353: {
354: if (sc_fd >= 0) {
355: sectok_close(sc_fd);
356: sc_fd = -1;
357: }
358: }
359:
1.24 markus 360: Key **
361: sc_get_keys(const char *id, const char *pin)
1.1 markus 362: {
1.24 markus 363: Key *k, *n, **keys;
364: int status, nkeys = 2;
1.1 markus 365:
1.11 markus 366: if (sc_reader_id != NULL)
367: xfree(sc_reader_id);
368: sc_reader_id = xstrdup(id);
369:
1.22 rees 370: if (sc_pin != NULL)
371: xfree(sc_pin);
372: sc_pin = (pin == NULL) ? NULL : xstrdup(pin);
373:
1.1 markus 374: k = key_new(KEY_RSA);
375: if (k == NULL) {
376: return NULL;
377: }
1.9 jakob 378: status = sc_read_pubkey(k);
379: if (status == SCARD_ERROR_NOCARD) {
380: key_free(k);
381: return NULL;
382: }
383: if (status < 0 ) {
1.1 markus 384: error("sc_read_pubkey failed");
385: key_free(k);
386: return NULL;
387: }
1.31 djm 388: keys = xcalloc((nkeys+1), sizeof(Key *));
1.24 markus 389:
390: n = key_new(KEY_RSA1);
391: BN_copy(n->rsa->n, k->rsa->n);
392: BN_copy(n->rsa->e, k->rsa->e);
393: RSA_set_method(n->rsa, sc_get_rsa());
394: n->flags |= KEY_FLAG_EXT;
395: keys[0] = n;
396:
397: n = key_new(KEY_RSA);
398: BN_copy(n->rsa->n, k->rsa->n);
399: BN_copy(n->rsa->e, k->rsa->e);
400: RSA_set_method(n->rsa, sc_get_rsa());
401: n->flags |= KEY_FLAG_EXT;
402: keys[1] = n;
403:
404: keys[2] = NULL;
405:
406: key_free(k);
407: return keys;
1.19 markus 408: }
409:
410: #define NUM_RSA_KEY_ELEMENTS 5+1
411: #define COPY_RSA_KEY(x, i) \
412: do { \
413: len = BN_num_bytes(prv->rsa->x); \
414: elements[i] = xmalloc(len); \
415: debug("#bytes %d", len); \
416: if (BN_bn2bin(prv->rsa->x, elements[i]) < 0) \
417: goto done; \
418: } while (0)
419:
1.22 rees 420: static void
421: sc_mk_digest(const char *pin, u_char *digest)
1.19 markus 422: {
423: const EVP_MD *evp_md = EVP_sha1();
424: EVP_MD_CTX md;
1.22 rees 425:
426: EVP_DigestInit(&md, evp_md);
427: EVP_DigestUpdate(&md, pin, strlen(pin));
428: EVP_DigestFinal(&md, digest, NULL);
429: }
430:
431: static int
432: get_AUT0(u_char *aut0)
433: {
1.19 markus 434: char *pass;
435:
436: pass = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN);
437: if (pass == NULL)
438: return -1;
1.22 rees 439: if (!strcmp(pass, "-")) {
440: memcpy(aut0, DEFAUT0, sizeof DEFAUT0);
441: return 0;
442: }
443: sc_mk_digest(pass, aut0);
1.19 markus 444: memset(pass, 0, strlen(pass));
445: xfree(pass);
446: return 0;
1.25 rees 447: }
448:
449: static int
450: try_AUT0(void)
451: {
452: u_char aut0[EVP_MAX_MD_SIZE];
453:
454: /* permission denied; try PIN if provided */
455: if (sc_pin && strlen(sc_pin) > 0) {
456: sc_mk_digest(sc_pin, aut0);
457: if (cyberflex_verify_AUT0(sc_fd, cla, aut0, 8) < 0) {
458: error("smartcard passphrase incorrect");
459: return (-1);
460: }
461: } else {
462: /* try default AUT0 key */
463: if (cyberflex_verify_AUT0(sc_fd, cla, DEFAUT0, 8) < 0) {
464: /* default AUT0 key failed; prompt for passphrase */
465: if (get_AUT0(aut0) < 0 ||
466: cyberflex_verify_AUT0(sc_fd, cla, aut0, 8) < 0) {
467: error("smartcard passphrase incorrect");
468: return (-1);
469: }
470: }
471: }
472: return (0);
1.19 markus 473: }
474:
475: int
476: sc_put_key(Key *prv, const char *id)
477: {
478: u_char *elements[NUM_RSA_KEY_ELEMENTS];
479: u_char key_fid[2];
480: u_char AUT0[EVP_MAX_MD_SIZE];
481: int len, status = -1, i, fd = -1, ret;
482: int sw = 0, cla = 0x00;
483:
484: for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++)
485: elements[i] = NULL;
486:
487: COPY_RSA_KEY(q, 0);
488: COPY_RSA_KEY(p, 1);
489: COPY_RSA_KEY(iqmp, 2);
490: COPY_RSA_KEY(dmq1, 3);
491: COPY_RSA_KEY(dmp1, 4);
492: COPY_RSA_KEY(n, 5);
493: len = BN_num_bytes(prv->rsa->n);
1.21 rees 494: fd = sectok_friendly_open(id, STONOWAIT, &sw);
1.19 markus 495: if (fd < 0) {
496: error("sectok_open failed: %s", sectok_get_sw(sw));
497: goto done;
498: }
499: if (! sectok_cardpresent(fd)) {
1.21 rees 500: error("smartcard in reader %s not present", id);
1.19 markus 501: goto done;
502: }
503: ret = sectok_reset(fd, 0, NULL, &sw);
504: if (ret <= 0) {
505: error("sectok_reset failed: %s", sectok_get_sw(sw));
506: goto done;
507: }
508: if ((cla = cyberflex_inq_class(fd)) < 0) {
509: error("cyberflex_inq_class failed");
510: goto done;
511: }
512: memcpy(AUT0, DEFAUT0, sizeof(DEFAUT0));
513: if (cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) {
514: if (get_AUT0(AUT0) < 0 ||
515: cyberflex_verify_AUT0(fd, cla, AUT0, sizeof(DEFAUT0)) < 0) {
1.22 rees 516: memset(AUT0, 0, sizeof(DEFAUT0));
517: error("smartcard passphrase incorrect");
1.19 markus 518: goto done;
519: }
520: }
1.22 rees 521: memset(AUT0, 0, sizeof(DEFAUT0));
1.19 markus 522: key_fid[0] = 0x00;
523: key_fid[1] = 0x12;
524: if (cyberflex_load_rsa_priv(fd, cla, key_fid, 5, 8*len, elements,
525: &sw) < 0) {
526: error("cyberflex_load_rsa_priv failed: %s", sectok_get_sw(sw));
527: goto done;
528: }
529: if (!sectok_swOK(sw))
530: goto done;
1.27 itojun 531: logit("cyberflex_load_rsa_priv done");
1.19 markus 532: key_fid[0] = 0x73;
533: key_fid[1] = 0x68;
534: if (cyberflex_load_rsa_pub(fd, cla, key_fid, len, elements[5],
535: &sw) < 0) {
536: error("cyberflex_load_rsa_pub failed: %s", sectok_get_sw(sw));
537: goto done;
538: }
539: if (!sectok_swOK(sw))
540: goto done;
1.27 itojun 541: logit("cyberflex_load_rsa_pub done");
1.19 markus 542: status = 0;
543:
544: done:
545: memset(elements[0], '\0', BN_num_bytes(prv->rsa->q));
546: memset(elements[1], '\0', BN_num_bytes(prv->rsa->p));
547: memset(elements[2], '\0', BN_num_bytes(prv->rsa->iqmp));
548: memset(elements[3], '\0', BN_num_bytes(prv->rsa->dmq1));
549: memset(elements[4], '\0', BN_num_bytes(prv->rsa->dmp1));
550: memset(elements[5], '\0', BN_num_bytes(prv->rsa->n));
551:
552: for (i = 0; i < NUM_RSA_KEY_ELEMENTS; i++)
553: if (elements[i])
554: xfree(elements[i]);
555: if (fd != -1)
556: sectok_close(fd);
557: return (status);
1.1 markus 558: }
1.28 markus 559:
560: char *
561: sc_get_key_label(Key *key)
562: {
563: return xstrdup("smartcard key");
564: }
565:
1.13 jakob 566: #endif /* SMARTCARD */
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