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295c8801 | 1 | /* |
2 | * Copyright (c) 2002 Juha Yrjölä. All rights reserved. | |
3 | * Copyright (c) 2001 Markus Friedl. | |
aff51935 | 4 | * |
295c8801 | 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 | #include "includes.h" | |
27 | #if defined(SMARTCARD) && defined(USE_OPENSC) | |
28 | ||
24436b92 | 29 | #include <sys/types.h> |
30 | ||
295c8801 | 31 | #include <openssl/evp.h> |
32 | #include <openssl/x509.h> | |
33 | ||
24436b92 | 34 | #include <stdarg.h> |
fce809d2 | 35 | #include <string.h> |
24436b92 | 36 | |
46c8e0f6 | 37 | #include <opensc/opensc.h> |
38 | #include <opensc/pkcs15.h> | |
295c8801 | 39 | |
40 | #include "key.h" | |
41 | #include "log.h" | |
42 | #include "xmalloc.h" | |
0f3ee929 | 43 | #include "misc.h" |
295c8801 | 44 | #include "scard.h" |
45 | ||
5866adb0 | 46 | #if OPENSSL_VERSION_NUMBER < 0x00907000L && defined(CRYPTO_LOCK_ENGINE) |
295c8801 | 47 | #define USE_ENGINE |
48 | #define RSA_get_default_method RSA_get_default_openssl_method | |
49 | #else | |
50 | #endif | |
51 | ||
52 | #ifdef USE_ENGINE | |
53 | #include <openssl/engine.h> | |
54 | #define sc_get_rsa sc_get_engine | |
55 | #else | |
56 | #define sc_get_rsa sc_get_rsa_method | |
57 | #endif | |
58 | ||
59 | static int sc_reader_id; | |
60 | static sc_context_t *ctx = NULL; | |
61 | static sc_card_t *card = NULL; | |
62 | static sc_pkcs15_card_t *p15card = NULL; | |
63 | ||
64 | static char *sc_pin = NULL; | |
65 | ||
66 | struct sc_priv_data | |
67 | { | |
68 | struct sc_pkcs15_id cert_id; | |
69 | int ref_count; | |
70 | }; | |
71 | ||
72 | void | |
73 | sc_close(void) | |
74 | { | |
75 | if (p15card) { | |
76 | sc_pkcs15_unbind(p15card); | |
77 | p15card = NULL; | |
78 | } | |
79 | if (card) { | |
80 | sc_disconnect_card(card, 0); | |
81 | card = NULL; | |
82 | } | |
83 | if (ctx) { | |
84 | sc_release_context(ctx); | |
85 | ctx = NULL; | |
86 | } | |
87 | } | |
88 | ||
aff51935 | 89 | static int |
295c8801 | 90 | sc_init(void) |
91 | { | |
92 | int r; | |
93 | ||
94 | r = sc_establish_context(&ctx, "openssh"); | |
95 | if (r) | |
96 | goto err; | |
d2168412 | 97 | if (sc_reader_id >= ctx->reader_count) { |
98 | r = SC_ERROR_NO_READERS_FOUND; | |
aff51935 | 99 | error("Illegal reader number %d (max %d)", sc_reader_id, |
d2168412 | 100 | ctx->reader_count -1); |
101 | goto err; | |
102 | } | |
295c8801 | 103 | r = sc_connect_card(ctx->reader[sc_reader_id], 0, &card); |
104 | if (r) | |
105 | goto err; | |
106 | r = sc_pkcs15_bind(card, &p15card); | |
107 | if (r) | |
108 | goto err; | |
109 | return 0; | |
110 | err: | |
111 | sc_close(); | |
112 | return r; | |
113 | } | |
114 | ||
115 | /* private key operations */ | |
116 | ||
117 | static int | |
4e2e1af3 | 118 | sc_prkey_op_init(RSA *rsa, struct sc_pkcs15_object **key_obj_out, |
119 | unsigned int usage) | |
295c8801 | 120 | { |
121 | int r; | |
122 | struct sc_priv_data *priv; | |
123 | struct sc_pkcs15_object *key_obj; | |
124 | struct sc_pkcs15_prkey_info *key; | |
125 | struct sc_pkcs15_object *pin_obj; | |
126 | struct sc_pkcs15_pin_info *pin; | |
127 | ||
128 | priv = (struct sc_priv_data *) RSA_get_app_data(rsa); | |
129 | if (priv == NULL) | |
130 | return -1; | |
131 | if (p15card == NULL) { | |
132 | sc_close(); | |
133 | r = sc_init(); | |
134 | if (r) { | |
135 | error("SmartCard init failed: %s", sc_strerror(r)); | |
136 | goto err; | |
137 | } | |
138 | } | |
aff51935 | 139 | r = sc_pkcs15_find_prkey_by_id_usage(p15card, &priv->cert_id, |
4e2e1af3 | 140 | usage, &key_obj); |
295c8801 | 141 | if (r) { |
142 | error("Unable to find private key from SmartCard: %s", | |
143 | sc_strerror(r)); | |
144 | goto err; | |
145 | } | |
146 | key = key_obj->data; | |
147 | r = sc_pkcs15_find_pin_by_auth_id(p15card, &key_obj->auth_id, | |
148 | &pin_obj); | |
11f1e60e | 149 | if (r == SC_ERROR_OBJECT_NOT_FOUND) { |
150 | /* no pin required */ | |
7b7f164b | 151 | r = sc_lock(card); |
152 | if (r) { | |
153 | error("Unable to lock smartcard: %s", sc_strerror(r)); | |
154 | goto err; | |
155 | } | |
11f1e60e | 156 | *key_obj_out = key_obj; |
157 | return 0; | |
158 | } else if (r) { | |
295c8801 | 159 | error("Unable to find PIN object from SmartCard: %s", |
160 | sc_strerror(r)); | |
161 | goto err; | |
162 | } | |
163 | pin = pin_obj->data; | |
164 | r = sc_lock(card); | |
165 | if (r) { | |
166 | error("Unable to lock smartcard: %s", sc_strerror(r)); | |
167 | goto err; | |
168 | } | |
169 | if (sc_pin != NULL) { | |
170 | r = sc_pkcs15_verify_pin(p15card, pin, sc_pin, | |
171 | strlen(sc_pin)); | |
172 | if (r) { | |
173 | sc_unlock(card); | |
174 | error("PIN code verification failed: %s", | |
175 | sc_strerror(r)); | |
176 | goto err; | |
177 | } | |
178 | } | |
179 | *key_obj_out = key_obj; | |
180 | return 0; | |
181 | err: | |
182 | sc_close(); | |
183 | return -1; | |
184 | } | |
185 | ||
4e2e1af3 | 186 | #define SC_USAGE_DECRYPT SC_PKCS15_PRKEY_USAGE_DECRYPT | \ |
187 | SC_PKCS15_PRKEY_USAGE_UNWRAP | |
188 | ||
295c8801 | 189 | static int |
190 | sc_private_decrypt(int flen, u_char *from, u_char *to, RSA *rsa, | |
191 | int padding) | |
192 | { | |
193 | struct sc_pkcs15_object *key_obj; | |
194 | int r; | |
195 | ||
196 | if (padding != RSA_PKCS1_PADDING) | |
b6453d99 | 197 | return -1; |
4e2e1af3 | 198 | r = sc_prkey_op_init(rsa, &key_obj, SC_USAGE_DECRYPT); |
295c8801 | 199 | if (r) |
200 | return -1; | |
aff51935 | 201 | r = sc_pkcs15_decipher(p15card, key_obj, SC_ALGORITHM_RSA_PAD_PKCS1, |
8acdec60 | 202 | from, flen, to, flen); |
295c8801 | 203 | sc_unlock(card); |
204 | if (r < 0) { | |
205 | error("sc_pkcs15_decipher() failed: %s", sc_strerror(r)); | |
206 | goto err; | |
207 | } | |
208 | return r; | |
209 | err: | |
210 | sc_close(); | |
211 | return -1; | |
212 | } | |
213 | ||
4e2e1af3 | 214 | #define SC_USAGE_SIGN SC_PKCS15_PRKEY_USAGE_SIGN | \ |
215 | SC_PKCS15_PRKEY_USAGE_SIGNRECOVER | |
216 | ||
295c8801 | 217 | static int |
218 | sc_sign(int type, u_char *m, unsigned int m_len, | |
219 | unsigned char *sigret, unsigned int *siglen, RSA *rsa) | |
220 | { | |
221 | struct sc_pkcs15_object *key_obj; | |
222 | int r; | |
223 | unsigned long flags = 0; | |
224 | ||
4e2e1af3 | 225 | /* XXX: sc_prkey_op_init will search for a pkcs15 private |
226 | * key object with the sign or signrecover usage flag set. | |
227 | * If the signing key has only the non-repudiation flag set | |
228 | * the key will be rejected as using a non-repudiation key | |
229 | * for authentication is not recommended. Note: This does not | |
230 | * prevent the use of a non-repudiation key for authentication | |
aff51935 | 231 | * if the sign or signrecover flag is set as well. |
4e2e1af3 | 232 | */ |
233 | r = sc_prkey_op_init(rsa, &key_obj, SC_USAGE_SIGN); | |
295c8801 | 234 | if (r) |
235 | return -1; | |
236 | /* FIXME: length of sigret correct? */ | |
237 | /* FIXME: check 'type' and modify flags accordingly */ | |
238 | flags = SC_ALGORITHM_RSA_PAD_PKCS1 | SC_ALGORITHM_RSA_HASH_SHA1; | |
239 | r = sc_pkcs15_compute_signature(p15card, key_obj, flags, | |
240 | m, m_len, sigret, RSA_size(rsa)); | |
241 | sc_unlock(card); | |
242 | if (r < 0) { | |
243 | error("sc_pkcs15_compute_signature() failed: %s", | |
244 | sc_strerror(r)); | |
245 | goto err; | |
246 | } | |
247 | *siglen = r; | |
248 | return 1; | |
249 | err: | |
250 | sc_close(); | |
251 | return 0; | |
252 | } | |
253 | ||
254 | static int | |
255 | sc_private_encrypt(int flen, u_char *from, u_char *to, RSA *rsa, | |
256 | int padding) | |
257 | { | |
258 | error("Private key encryption not supported"); | |
259 | return -1; | |
260 | } | |
261 | ||
262 | /* called on free */ | |
263 | ||
264 | static int (*orig_finish)(RSA *rsa) = NULL; | |
265 | ||
266 | static int | |
267 | sc_finish(RSA *rsa) | |
268 | { | |
269 | struct sc_priv_data *priv; | |
270 | ||
271 | priv = RSA_get_app_data(rsa); | |
272 | priv->ref_count--; | |
273 | if (priv->ref_count == 0) { | |
274 | free(priv); | |
275 | sc_close(); | |
276 | } | |
277 | if (orig_finish) | |
278 | orig_finish(rsa); | |
279 | return 1; | |
280 | } | |
281 | ||
282 | /* engine for overloading private key operations */ | |
283 | ||
284 | static RSA_METHOD * | |
285 | sc_get_rsa_method(void) | |
286 | { | |
287 | static RSA_METHOD smart_rsa; | |
288 | const RSA_METHOD *def = RSA_get_default_method(); | |
289 | ||
290 | /* use the OpenSSL version */ | |
291 | memcpy(&smart_rsa, def, sizeof(smart_rsa)); | |
292 | ||
293 | smart_rsa.name = "opensc"; | |
294 | ||
295 | /* overload */ | |
296 | smart_rsa.rsa_priv_enc = sc_private_encrypt; | |
297 | smart_rsa.rsa_priv_dec = sc_private_decrypt; | |
298 | smart_rsa.rsa_sign = sc_sign; | |
299 | ||
300 | /* save original */ | |
301 | orig_finish = def->finish; | |
302 | smart_rsa.finish = sc_finish; | |
303 | ||
304 | return &smart_rsa; | |
305 | } | |
306 | ||
307 | #ifdef USE_ENGINE | |
308 | static ENGINE * | |
309 | sc_get_engine(void) | |
310 | { | |
311 | static ENGINE *smart_engine = NULL; | |
312 | ||
313 | if ((smart_engine = ENGINE_new()) == NULL) | |
314 | fatal("ENGINE_new failed"); | |
315 | ||
316 | ENGINE_set_id(smart_engine, "opensc"); | |
317 | ENGINE_set_name(smart_engine, "OpenSC"); | |
318 | ||
319 | ENGINE_set_RSA(smart_engine, sc_get_rsa_method()); | |
320 | ENGINE_set_DSA(smart_engine, DSA_get_default_openssl_method()); | |
321 | ENGINE_set_DH(smart_engine, DH_get_default_openssl_method()); | |
322 | ENGINE_set_RAND(smart_engine, RAND_SSLeay()); | |
323 | ENGINE_set_BN_mod_exp(smart_engine, BN_mod_exp); | |
324 | ||
325 | return smart_engine; | |
326 | } | |
327 | #endif | |
328 | ||
329 | static void | |
330 | convert_rsa_to_rsa1(Key * in, Key * out) | |
331 | { | |
332 | struct sc_priv_data *priv; | |
b6453d99 | 333 | |
295c8801 | 334 | out->rsa->flags = in->rsa->flags; |
335 | out->flags = in->flags; | |
336 | RSA_set_method(out->rsa, RSA_get_method(in->rsa)); | |
337 | BN_copy(out->rsa->n, in->rsa->n); | |
338 | BN_copy(out->rsa->e, in->rsa->e); | |
339 | priv = RSA_get_app_data(in->rsa); | |
340 | priv->ref_count++; | |
341 | RSA_set_app_data(out->rsa, priv); | |
342 | return; | |
343 | } | |
344 | ||
aff51935 | 345 | static int |
295c8801 | 346 | sc_read_pubkey(Key * k, const struct sc_pkcs15_object *cert_obj) |
347 | { | |
348 | int r; | |
349 | sc_pkcs15_cert_t *cert = NULL; | |
350 | struct sc_priv_data *priv = NULL; | |
351 | sc_pkcs15_cert_info_t *cinfo = cert_obj->data; | |
352 | ||
353 | X509 *x509 = NULL; | |
354 | EVP_PKEY *pubkey = NULL; | |
355 | u8 *p; | |
356 | char *tmp; | |
b6453d99 | 357 | |
295c8801 | 358 | debug("sc_read_pubkey() with cert id %02X", cinfo->id.value[0]); |
359 | r = sc_pkcs15_read_certificate(p15card, cinfo, &cert); | |
360 | if (r) { | |
bbe88b6d | 361 | logit("Certificate read failed: %s", sc_strerror(r)); |
295c8801 | 362 | goto err; |
363 | } | |
364 | x509 = X509_new(); | |
365 | if (x509 == NULL) { | |
aff51935 | 366 | r = -1; |
295c8801 | 367 | goto err; |
368 | } | |
369 | p = cert->data; | |
370 | if (!d2i_X509(&x509, &p, cert->data_len)) { | |
bbe88b6d | 371 | logit("Unable to parse X.509 certificate"); |
295c8801 | 372 | r = -1; |
373 | goto err; | |
374 | } | |
375 | sc_pkcs15_free_certificate(cert); | |
376 | cert = NULL; | |
377 | pubkey = X509_get_pubkey(x509); | |
378 | X509_free(x509); | |
379 | x509 = NULL; | |
380 | if (pubkey->type != EVP_PKEY_RSA) { | |
bbe88b6d | 381 | logit("Public key is of unknown type"); |
295c8801 | 382 | r = -1; |
383 | goto err; | |
384 | } | |
385 | k->rsa = EVP_PKEY_get1_RSA(pubkey); | |
386 | EVP_PKEY_free(pubkey); | |
387 | ||
388 | k->rsa->flags |= RSA_FLAG_SIGN_VER; | |
389 | RSA_set_method(k->rsa, sc_get_rsa_method()); | |
390 | priv = xmalloc(sizeof(struct sc_priv_data)); | |
391 | priv->cert_id = cinfo->id; | |
392 | priv->ref_count = 1; | |
393 | RSA_set_app_data(k->rsa, priv); | |
394 | ||
395 | k->flags = KEY_FLAG_EXT; | |
396 | tmp = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX); | |
397 | debug("fingerprint %d %s", key_size(k), tmp); | |
398 | xfree(tmp); | |
b6453d99 | 399 | |
295c8801 | 400 | return 0; |
401 | err: | |
402 | if (cert) | |
403 | sc_pkcs15_free_certificate(cert); | |
404 | if (pubkey) | |
405 | EVP_PKEY_free(pubkey); | |
406 | if (x509) | |
407 | X509_free(x509); | |
408 | return r; | |
409 | } | |
410 | ||
411 | Key ** | |
412 | sc_get_keys(const char *id, const char *pin) | |
413 | { | |
414 | Key *k, **keys; | |
415 | int i, r, real_count = 0, key_count; | |
416 | sc_pkcs15_id_t cert_id; | |
417 | sc_pkcs15_object_t *certs[32]; | |
418 | char *buf = xstrdup(id), *p; | |
419 | ||
420 | debug("sc_get_keys called: id = %s", id); | |
421 | ||
422 | if (sc_pin != NULL) | |
423 | xfree(sc_pin); | |
424 | sc_pin = (pin == NULL) ? NULL : xstrdup(pin); | |
425 | ||
426 | cert_id.len = 0; | |
427 | if ((p = strchr(buf, ':')) != NULL) { | |
428 | *p = 0; | |
429 | p++; | |
430 | sc_pkcs15_hex_string_to_id(p, &cert_id); | |
431 | } | |
432 | r = sscanf(buf, "%d", &sc_reader_id); | |
433 | xfree(buf); | |
434 | if (r != 1) | |
435 | goto err; | |
436 | if (p15card == NULL) { | |
437 | sc_close(); | |
438 | r = sc_init(); | |
439 | if (r) { | |
440 | error("Smartcard init failed: %s", sc_strerror(r)); | |
441 | goto err; | |
442 | } | |
443 | } | |
444 | if (cert_id.len) { | |
445 | r = sc_pkcs15_find_cert_by_id(p15card, &cert_id, &certs[0]); | |
446 | if (r < 0) | |
447 | goto err; | |
448 | key_count = 1; | |
449 | } else { | |
450 | r = sc_pkcs15_get_objects(p15card, SC_PKCS15_TYPE_CERT_X509, | |
451 | certs, 32); | |
452 | if (r == 0) { | |
bbe88b6d | 453 | logit("No certificates found on smartcard"); |
295c8801 | 454 | r = -1; |
455 | goto err; | |
456 | } else if (r < 0) { | |
457 | error("Certificate enumeration failed: %s", | |
458 | sc_strerror(r)); | |
459 | goto err; | |
460 | } | |
461 | key_count = r; | |
462 | } | |
01d35895 | 463 | if (key_count > 1024) |
464 | fatal("Too many keys (%u), expected <= 1024", key_count); | |
465 | keys = xcalloc(key_count * 2 + 1, sizeof(Key *)); | |
295c8801 | 466 | for (i = 0; i < key_count; i++) { |
7b7f164b | 467 | sc_pkcs15_object_t *tmp_obj = NULL; |
468 | cert_id = ((sc_pkcs15_cert_info_t *)(certs[i]->data))->id; | |
469 | if (sc_pkcs15_find_prkey_by_id(p15card, &cert_id, &tmp_obj)) | |
470 | /* skip the public key (certificate) if no | |
471 | * corresponding private key is present */ | |
472 | continue; | |
295c8801 | 473 | k = key_new(KEY_RSA); |
474 | if (k == NULL) | |
475 | break; | |
476 | r = sc_read_pubkey(k, certs[i]); | |
477 | if (r) { | |
478 | error("sc_read_pubkey failed: %s", sc_strerror(r)); | |
479 | key_free(k); | |
480 | continue; | |
481 | } | |
482 | keys[real_count] = k; | |
483 | real_count++; | |
484 | k = key_new(KEY_RSA1); | |
485 | if (k == NULL) | |
486 | break; | |
487 | convert_rsa_to_rsa1(keys[real_count-1], k); | |
488 | keys[real_count] = k; | |
489 | real_count++; | |
490 | } | |
491 | keys[real_count] = NULL; | |
492 | ||
493 | return keys; | |
494 | err: | |
495 | sc_close(); | |
496 | return NULL; | |
497 | } | |
498 | ||
499 | int | |
500 | sc_put_key(Key *prv, const char *id) | |
501 | { | |
502 | error("key uploading not yet supported"); | |
503 | return -1; | |
504 | } | |
505 | ||
9ea150a7 | 506 | char * |
507 | sc_get_key_label(Key *key) | |
508 | { | |
509 | int r; | |
510 | const struct sc_priv_data *priv; | |
511 | struct sc_pkcs15_object *key_obj; | |
512 | ||
513 | priv = (const struct sc_priv_data *) RSA_get_app_data(key->rsa); | |
514 | if (priv == NULL || p15card == NULL) { | |
515 | logit("SmartCard key not loaded"); | |
516 | /* internal error => return default label */ | |
517 | return xstrdup("smartcard key"); | |
518 | } | |
519 | r = sc_pkcs15_find_prkey_by_id(p15card, &priv->cert_id, &key_obj); | |
520 | if (r) { | |
521 | logit("Unable to find private key from SmartCard: %s", | |
522 | sc_strerror(r)); | |
523 | return xstrdup("smartcard key"); | |
524 | } | |
525 | if (key_obj == NULL || key_obj->label == NULL) | |
526 | /* the optional PKCS#15 label does not exists | |
527 | * => return the default label */ | |
528 | return xstrdup("smartcard key"); | |
529 | return xstrdup(key_obj->label); | |
530 | } | |
531 | ||
295c8801 | 532 | #endif /* SMARTCARD */ |