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2980ea68 | 1 | /* |
2 | * Copyright (c) 2002 Juha Yrjölä. All rights reserved. | |
3 | * Copyright (c) 2001 Markus Friedl. | |
416fd2a8 | 4 | * |
2980ea68 | 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 | ||
2e437378 | 29 | #include <sys/types.h> |
30 | ||
2980ea68 | 31 | #include <openssl/evp.h> |
32 | #include <openssl/x509.h> | |
33 | ||
2e437378 | 34 | #include <stdarg.h> |
35 | ||
2980ea68 | 36 | #include <opensc/opensc.h> |
37 | #include <opensc/pkcs15.h> | |
38 | ||
39 | #include "key.h" | |
40 | #include "log.h" | |
41 | #include "xmalloc.h" | |
1b56ff3d | 42 | #include "misc.h" |
2980ea68 | 43 | #include "scard.h" |
44 | ||
45 | #if OPENSSL_VERSION_NUMBER < 0x00907000L && defined(CRYPTO_LOCK_ENGINE) | |
46 | #define USE_ENGINE | |
47 | #define RSA_get_default_method RSA_get_default_openssl_method | |
48 | #else | |
49 | #endif | |
50 | ||
51 | #ifdef USE_ENGINE | |
52 | #include <openssl/engine.h> | |
53 | #define sc_get_rsa sc_get_engine | |
54 | #else | |
55 | #define sc_get_rsa sc_get_rsa_method | |
56 | #endif | |
57 | ||
58 | static int sc_reader_id; | |
59 | static sc_context_t *ctx = NULL; | |
60 | static sc_card_t *card = NULL; | |
61 | static sc_pkcs15_card_t *p15card = NULL; | |
62 | ||
63 | static char *sc_pin = NULL; | |
64 | ||
65 | struct sc_priv_data | |
66 | { | |
67 | struct sc_pkcs15_id cert_id; | |
68 | int ref_count; | |
69 | }; | |
70 | ||
71 | void | |
72 | sc_close(void) | |
73 | { | |
74 | if (p15card) { | |
75 | sc_pkcs15_unbind(p15card); | |
76 | p15card = NULL; | |
77 | } | |
78 | if (card) { | |
79 | sc_disconnect_card(card, 0); | |
80 | card = NULL; | |
81 | } | |
82 | if (ctx) { | |
83 | sc_release_context(ctx); | |
84 | ctx = NULL; | |
85 | } | |
86 | } | |
87 | ||
416fd2a8 | 88 | static int |
2980ea68 | 89 | sc_init(void) |
90 | { | |
91 | int r; | |
92 | ||
93 | r = sc_establish_context(&ctx, "openssh"); | |
94 | if (r) | |
95 | goto err; | |
70791e56 | 96 | if (sc_reader_id >= ctx->reader_count) { |
97 | r = SC_ERROR_NO_READERS_FOUND; | |
416fd2a8 | 98 | error("Illegal reader number %d (max %d)", sc_reader_id, |
70791e56 | 99 | ctx->reader_count -1); |
100 | goto err; | |
101 | } | |
2980ea68 | 102 | r = sc_connect_card(ctx->reader[sc_reader_id], 0, &card); |
103 | if (r) | |
104 | goto err; | |
105 | r = sc_pkcs15_bind(card, &p15card); | |
106 | if (r) | |
107 | goto err; | |
108 | return 0; | |
109 | err: | |
110 | sc_close(); | |
111 | return r; | |
112 | } | |
113 | ||
114 | /* private key operations */ | |
115 | ||
116 | static int | |
70791e56 | 117 | sc_prkey_op_init(RSA *rsa, struct sc_pkcs15_object **key_obj_out, |
118 | unsigned int usage) | |
2980ea68 | 119 | { |
120 | int r; | |
121 | struct sc_priv_data *priv; | |
122 | struct sc_pkcs15_object *key_obj; | |
123 | struct sc_pkcs15_prkey_info *key; | |
124 | struct sc_pkcs15_object *pin_obj; | |
125 | struct sc_pkcs15_pin_info *pin; | |
126 | ||
127 | priv = (struct sc_priv_data *) RSA_get_app_data(rsa); | |
128 | if (priv == NULL) | |
129 | return -1; | |
130 | if (p15card == NULL) { | |
131 | sc_close(); | |
132 | r = sc_init(); | |
133 | if (r) { | |
134 | error("SmartCard init failed: %s", sc_strerror(r)); | |
135 | goto err; | |
136 | } | |
137 | } | |
416fd2a8 | 138 | r = sc_pkcs15_find_prkey_by_id_usage(p15card, &priv->cert_id, |
70791e56 | 139 | usage, &key_obj); |
2980ea68 | 140 | if (r) { |
141 | error("Unable to find private key from SmartCard: %s", | |
142 | sc_strerror(r)); | |
143 | goto err; | |
144 | } | |
145 | key = key_obj->data; | |
146 | r = sc_pkcs15_find_pin_by_auth_id(p15card, &key_obj->auth_id, | |
147 | &pin_obj); | |
70791e56 | 148 | if (r == SC_ERROR_OBJECT_NOT_FOUND) { |
149 | /* no pin required */ | |
150 | r = sc_lock(card); | |
151 | if (r) { | |
152 | error("Unable to lock smartcard: %s", sc_strerror(r)); | |
153 | goto err; | |
154 | } | |
155 | *key_obj_out = key_obj; | |
156 | return 0; | |
157 | } else if (r) { | |
2980ea68 | 158 | error("Unable to find PIN object from SmartCard: %s", |
159 | sc_strerror(r)); | |
160 | goto err; | |
161 | } | |
162 | pin = pin_obj->data; | |
163 | r = sc_lock(card); | |
164 | if (r) { | |
165 | error("Unable to lock smartcard: %s", sc_strerror(r)); | |
166 | goto err; | |
167 | } | |
168 | if (sc_pin != NULL) { | |
169 | r = sc_pkcs15_verify_pin(p15card, pin, sc_pin, | |
170 | strlen(sc_pin)); | |
171 | if (r) { | |
172 | sc_unlock(card); | |
173 | error("PIN code verification failed: %s", | |
174 | sc_strerror(r)); | |
175 | goto err; | |
176 | } | |
177 | } | |
178 | *key_obj_out = key_obj; | |
179 | return 0; | |
180 | err: | |
181 | sc_close(); | |
182 | return -1; | |
183 | } | |
184 | ||
70791e56 | 185 | #define SC_USAGE_DECRYPT SC_PKCS15_PRKEY_USAGE_DECRYPT | \ |
186 | SC_PKCS15_PRKEY_USAGE_UNWRAP | |
187 | ||
2980ea68 | 188 | static int |
189 | sc_private_decrypt(int flen, u_char *from, u_char *to, RSA *rsa, | |
190 | int padding) | |
191 | { | |
192 | struct sc_pkcs15_object *key_obj; | |
193 | int r; | |
194 | ||
195 | if (padding != RSA_PKCS1_PADDING) | |
416fd2a8 | 196 | return -1; |
70791e56 | 197 | r = sc_prkey_op_init(rsa, &key_obj, SC_USAGE_DECRYPT); |
2980ea68 | 198 | if (r) |
199 | return -1; | |
416fd2a8 | 200 | r = sc_pkcs15_decipher(p15card, key_obj, SC_ALGORITHM_RSA_PAD_PKCS1, |
70791e56 | 201 | from, flen, to, flen); |
2980ea68 | 202 | sc_unlock(card); |
203 | if (r < 0) { | |
204 | error("sc_pkcs15_decipher() failed: %s", sc_strerror(r)); | |
205 | goto err; | |
206 | } | |
207 | return r; | |
208 | err: | |
209 | sc_close(); | |
210 | return -1; | |
211 | } | |
212 | ||
70791e56 | 213 | #define SC_USAGE_SIGN SC_PKCS15_PRKEY_USAGE_SIGN | \ |
214 | SC_PKCS15_PRKEY_USAGE_SIGNRECOVER | |
215 | ||
2980ea68 | 216 | static int |
217 | sc_sign(int type, u_char *m, unsigned int m_len, | |
218 | unsigned char *sigret, unsigned int *siglen, RSA *rsa) | |
219 | { | |
220 | struct sc_pkcs15_object *key_obj; | |
221 | int r; | |
222 | unsigned long flags = 0; | |
223 | ||
70791e56 | 224 | /* XXX: sc_prkey_op_init will search for a pkcs15 private |
225 | * key object with the sign or signrecover usage flag set. | |
226 | * If the signing key has only the non-repudiation flag set | |
227 | * the key will be rejected as using a non-repudiation key | |
228 | * for authentication is not recommended. Note: This does not | |
229 | * prevent the use of a non-repudiation key for authentication | |
416fd2a8 | 230 | * if the sign or signrecover flag is set as well. |
70791e56 | 231 | */ |
232 | r = sc_prkey_op_init(rsa, &key_obj, SC_USAGE_SIGN); | |
2980ea68 | 233 | if (r) |
234 | return -1; | |
235 | /* FIXME: length of sigret correct? */ | |
236 | /* FIXME: check 'type' and modify flags accordingly */ | |
237 | flags = SC_ALGORITHM_RSA_PAD_PKCS1 | SC_ALGORITHM_RSA_HASH_SHA1; | |
238 | r = sc_pkcs15_compute_signature(p15card, key_obj, flags, | |
239 | m, m_len, sigret, RSA_size(rsa)); | |
240 | sc_unlock(card); | |
241 | if (r < 0) { | |
242 | error("sc_pkcs15_compute_signature() failed: %s", | |
243 | sc_strerror(r)); | |
244 | goto err; | |
245 | } | |
246 | *siglen = r; | |
247 | return 1; | |
248 | err: | |
249 | sc_close(); | |
250 | return 0; | |
251 | } | |
252 | ||
253 | static int | |
254 | sc_private_encrypt(int flen, u_char *from, u_char *to, RSA *rsa, | |
255 | int padding) | |
256 | { | |
257 | error("Private key encryption not supported"); | |
258 | return -1; | |
259 | } | |
260 | ||
261 | /* called on free */ | |
262 | ||
263 | static int (*orig_finish)(RSA *rsa) = NULL; | |
264 | ||
265 | static int | |
266 | sc_finish(RSA *rsa) | |
267 | { | |
268 | struct sc_priv_data *priv; | |
269 | ||
270 | priv = RSA_get_app_data(rsa); | |
271 | priv->ref_count--; | |
272 | if (priv->ref_count == 0) { | |
273 | free(priv); | |
274 | sc_close(); | |
275 | } | |
276 | if (orig_finish) | |
277 | orig_finish(rsa); | |
278 | return 1; | |
279 | } | |
280 | ||
281 | /* engine for overloading private key operations */ | |
282 | ||
283 | static RSA_METHOD * | |
284 | sc_get_rsa_method(void) | |
285 | { | |
286 | static RSA_METHOD smart_rsa; | |
287 | const RSA_METHOD *def = RSA_get_default_method(); | |
288 | ||
289 | /* use the OpenSSL version */ | |
290 | memcpy(&smart_rsa, def, sizeof(smart_rsa)); | |
291 | ||
292 | smart_rsa.name = "opensc"; | |
293 | ||
294 | /* overload */ | |
295 | smart_rsa.rsa_priv_enc = sc_private_encrypt; | |
296 | smart_rsa.rsa_priv_dec = sc_private_decrypt; | |
297 | smart_rsa.rsa_sign = sc_sign; | |
298 | ||
299 | /* save original */ | |
300 | orig_finish = def->finish; | |
301 | smart_rsa.finish = sc_finish; | |
302 | ||
303 | return &smart_rsa; | |
304 | } | |
305 | ||
306 | #ifdef USE_ENGINE | |
307 | static ENGINE * | |
308 | sc_get_engine(void) | |
309 | { | |
310 | static ENGINE *smart_engine = NULL; | |
311 | ||
312 | if ((smart_engine = ENGINE_new()) == NULL) | |
313 | fatal("ENGINE_new failed"); | |
314 | ||
315 | ENGINE_set_id(smart_engine, "opensc"); | |
316 | ENGINE_set_name(smart_engine, "OpenSC"); | |
317 | ||
318 | ENGINE_set_RSA(smart_engine, sc_get_rsa_method()); | |
319 | ENGINE_set_DSA(smart_engine, DSA_get_default_openssl_method()); | |
320 | ENGINE_set_DH(smart_engine, DH_get_default_openssl_method()); | |
321 | ENGINE_set_RAND(smart_engine, RAND_SSLeay()); | |
322 | ENGINE_set_BN_mod_exp(smart_engine, BN_mod_exp); | |
323 | ||
324 | return smart_engine; | |
325 | } | |
326 | #endif | |
327 | ||
328 | static void | |
329 | convert_rsa_to_rsa1(Key * in, Key * out) | |
330 | { | |
331 | struct sc_priv_data *priv; | |
416fd2a8 | 332 | |
2980ea68 | 333 | out->rsa->flags = in->rsa->flags; |
334 | out->flags = in->flags; | |
335 | RSA_set_method(out->rsa, RSA_get_method(in->rsa)); | |
336 | BN_copy(out->rsa->n, in->rsa->n); | |
337 | BN_copy(out->rsa->e, in->rsa->e); | |
338 | priv = RSA_get_app_data(in->rsa); | |
339 | priv->ref_count++; | |
340 | RSA_set_app_data(out->rsa, priv); | |
341 | return; | |
342 | } | |
343 | ||
416fd2a8 | 344 | static int |
2980ea68 | 345 | sc_read_pubkey(Key * k, const struct sc_pkcs15_object *cert_obj) |
346 | { | |
347 | int r; | |
348 | sc_pkcs15_cert_t *cert = NULL; | |
349 | struct sc_priv_data *priv = NULL; | |
350 | sc_pkcs15_cert_info_t *cinfo = cert_obj->data; | |
351 | ||
352 | X509 *x509 = NULL; | |
353 | EVP_PKEY *pubkey = NULL; | |
354 | u8 *p; | |
355 | char *tmp; | |
416fd2a8 | 356 | |
2980ea68 | 357 | debug("sc_read_pubkey() with cert id %02X", cinfo->id.value[0]); |
358 | r = sc_pkcs15_read_certificate(p15card, cinfo, &cert); | |
359 | if (r) { | |
70791e56 | 360 | logit("Certificate read failed: %s", sc_strerror(r)); |
2980ea68 | 361 | goto err; |
362 | } | |
363 | x509 = X509_new(); | |
364 | if (x509 == NULL) { | |
416fd2a8 | 365 | r = -1; |
2980ea68 | 366 | goto err; |
367 | } | |
368 | p = cert->data; | |
369 | if (!d2i_X509(&x509, &p, cert->data_len)) { | |
70791e56 | 370 | logit("Unable to parse X.509 certificate"); |
2980ea68 | 371 | r = -1; |
372 | goto err; | |
373 | } | |
374 | sc_pkcs15_free_certificate(cert); | |
375 | cert = NULL; | |
376 | pubkey = X509_get_pubkey(x509); | |
377 | X509_free(x509); | |
378 | x509 = NULL; | |
379 | if (pubkey->type != EVP_PKEY_RSA) { | |
70791e56 | 380 | logit("Public key is of unknown type"); |
2980ea68 | 381 | r = -1; |
382 | goto err; | |
383 | } | |
384 | k->rsa = EVP_PKEY_get1_RSA(pubkey); | |
385 | EVP_PKEY_free(pubkey); | |
386 | ||
387 | k->rsa->flags |= RSA_FLAG_SIGN_VER; | |
388 | RSA_set_method(k->rsa, sc_get_rsa_method()); | |
389 | priv = xmalloc(sizeof(struct sc_priv_data)); | |
390 | priv->cert_id = cinfo->id; | |
391 | priv->ref_count = 1; | |
392 | RSA_set_app_data(k->rsa, priv); | |
393 | ||
394 | k->flags = KEY_FLAG_EXT; | |
395 | tmp = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX); | |
396 | debug("fingerprint %d %s", key_size(k), tmp); | |
397 | xfree(tmp); | |
416fd2a8 | 398 | |
2980ea68 | 399 | return 0; |
400 | err: | |
401 | if (cert) | |
402 | sc_pkcs15_free_certificate(cert); | |
403 | if (pubkey) | |
404 | EVP_PKEY_free(pubkey); | |
405 | if (x509) | |
406 | X509_free(x509); | |
407 | return r; | |
408 | } | |
409 | ||
410 | Key ** | |
411 | sc_get_keys(const char *id, const char *pin) | |
412 | { | |
413 | Key *k, **keys; | |
414 | int i, r, real_count = 0, key_count; | |
415 | sc_pkcs15_id_t cert_id; | |
416 | sc_pkcs15_object_t *certs[32]; | |
417 | char *buf = xstrdup(id), *p; | |
418 | ||
419 | debug("sc_get_keys called: id = %s", id); | |
420 | ||
421 | if (sc_pin != NULL) | |
422 | xfree(sc_pin); | |
423 | sc_pin = (pin == NULL) ? NULL : xstrdup(pin); | |
424 | ||
425 | cert_id.len = 0; | |
426 | if ((p = strchr(buf, ':')) != NULL) { | |
427 | *p = 0; | |
428 | p++; | |
429 | sc_pkcs15_hex_string_to_id(p, &cert_id); | |
430 | } | |
431 | r = sscanf(buf, "%d", &sc_reader_id); | |
432 | xfree(buf); | |
433 | if (r != 1) | |
434 | goto err; | |
435 | if (p15card == NULL) { | |
436 | sc_close(); | |
437 | r = sc_init(); | |
438 | if (r) { | |
439 | error("Smartcard init failed: %s", sc_strerror(r)); | |
440 | goto err; | |
441 | } | |
442 | } | |
443 | if (cert_id.len) { | |
444 | r = sc_pkcs15_find_cert_by_id(p15card, &cert_id, &certs[0]); | |
445 | if (r < 0) | |
446 | goto err; | |
447 | key_count = 1; | |
448 | } else { | |
449 | r = sc_pkcs15_get_objects(p15card, SC_PKCS15_TYPE_CERT_X509, | |
450 | certs, 32); | |
451 | if (r == 0) { | |
70791e56 | 452 | logit("No certificates found on smartcard"); |
2980ea68 | 453 | r = -1; |
454 | goto err; | |
455 | } else if (r < 0) { | |
456 | error("Certificate enumeration failed: %s", | |
457 | sc_strerror(r)); | |
458 | goto err; | |
459 | } | |
460 | key_count = r; | |
461 | } | |
2e437378 | 462 | if (key_count > 1024) |
463 | fatal("Too many keys (%u), expected <= 1024", key_count); | |
464 | keys = xcalloc(key_count * 2 + 1, sizeof(Key *)); | |
2980ea68 | 465 | for (i = 0; i < key_count; i++) { |
70791e56 | 466 | sc_pkcs15_object_t *tmp_obj = NULL; |
467 | cert_id = ((sc_pkcs15_cert_info_t *)(certs[i]->data))->id; | |
468 | if (sc_pkcs15_find_prkey_by_id(p15card, &cert_id, &tmp_obj)) | |
469 | /* skip the public key (certificate) if no | |
470 | * corresponding private key is present */ | |
471 | continue; | |
2980ea68 | 472 | k = key_new(KEY_RSA); |
473 | if (k == NULL) | |
474 | break; | |
475 | r = sc_read_pubkey(k, certs[i]); | |
476 | if (r) { | |
477 | error("sc_read_pubkey failed: %s", sc_strerror(r)); | |
478 | key_free(k); | |
479 | continue; | |
480 | } | |
481 | keys[real_count] = k; | |
482 | real_count++; | |
483 | k = key_new(KEY_RSA1); | |
484 | if (k == NULL) | |
485 | break; | |
486 | convert_rsa_to_rsa1(keys[real_count-1], k); | |
487 | keys[real_count] = k; | |
488 | real_count++; | |
489 | } | |
490 | keys[real_count] = NULL; | |
491 | ||
492 | return keys; | |
493 | err: | |
494 | sc_close(); | |
495 | return NULL; | |
496 | } | |
497 | ||
498 | int | |
499 | sc_put_key(Key *prv, const char *id) | |
500 | { | |
501 | error("key uploading not yet supported"); | |
502 | return -1; | |
503 | } | |
504 | ||
70791e56 | 505 | char * |
506 | sc_get_key_label(Key *key) | |
507 | { | |
508 | int r; | |
509 | const struct sc_priv_data *priv; | |
510 | struct sc_pkcs15_object *key_obj; | |
511 | ||
512 | priv = (const struct sc_priv_data *) RSA_get_app_data(key->rsa); | |
513 | if (priv == NULL || p15card == NULL) { | |
514 | logit("SmartCard key not loaded"); | |
515 | /* internal error => return default label */ | |
516 | return xstrdup("smartcard key"); | |
517 | } | |
518 | r = sc_pkcs15_find_prkey_by_id(p15card, &priv->cert_id, &key_obj); | |
519 | if (r) { | |
520 | logit("Unable to find private key from SmartCard: %s", | |
521 | sc_strerror(r)); | |
522 | return xstrdup("smartcard key"); | |
523 | } | |
524 | if (key_obj == NULL || key_obj->label == NULL) | |
525 | /* the optional PKCS#15 label does not exists | |
526 | * => return the default label */ | |
527 | return xstrdup("smartcard key"); | |
528 | return xstrdup(key_obj->label); | |
529 | } | |
530 | ||
2980ea68 | 531 | #endif /* SMARTCARD */ |