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-rw-r--r--scard-opensc.c532
1 files changed, 0 insertions, 532 deletions
diff --git a/scard-opensc.c b/scard-opensc.c
deleted file mode 100644
index 36dae05fd..000000000
--- a/scard-opensc.c
+++ /dev/null
@@ -1,532 +0,0 @@
1/*
2 * Copyright (c) 2002 Juha Yrjölä. All rights reserved.
3 * Copyright (c) 2001 Markus Friedl.
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#include "includes.h"
27#if defined(SMARTCARD) && defined(USE_OPENSC)
28
29#include <sys/types.h>
30
31#include <openssl/evp.h>
32#include <openssl/x509.h>
33
34#include <stdarg.h>
35#include <string.h>
36
37#include <opensc/opensc.h>
38#include <opensc/pkcs15.h>
39
40#include "key.h"
41#include "log.h"
42#include "xmalloc.h"
43#include "misc.h"
44#include "scard.h"
45
46#if OPENSSL_VERSION_NUMBER < 0x00907000L && defined(CRYPTO_LOCK_ENGINE)
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
59static int sc_reader_id;
60static sc_context_t *ctx = NULL;
61static sc_card_t *card = NULL;
62static sc_pkcs15_card_t *p15card = NULL;
63
64static char *sc_pin = NULL;
65
66struct sc_priv_data
67{
68 struct sc_pkcs15_id cert_id;
69 int ref_count;
70};
71
72void
73sc_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
89static int
90sc_init(void)
91{
92 int r;
93
94 r = sc_establish_context(&ctx, "openssh");
95 if (r)
96 goto err;
97 if (sc_reader_id >= ctx->reader_count) {
98 r = SC_ERROR_NO_READERS_FOUND;
99 error("Illegal reader number %d (max %d)", sc_reader_id,
100 ctx->reader_count -1);
101 goto err;
102 }
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;
110err:
111 sc_close();
112 return r;
113}
114
115/* private key operations */
116
117static int
118sc_prkey_op_init(RSA *rsa, struct sc_pkcs15_object **key_obj_out,
119 unsigned int usage)
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 }
139 r = sc_pkcs15_find_prkey_by_id_usage(p15card, &priv->cert_id,
140 usage, &key_obj);
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);
149 if (r == SC_ERROR_OBJECT_NOT_FOUND) {
150 /* no pin required */
151 r = sc_lock(card);
152 if (r) {
153 error("Unable to lock smartcard: %s", sc_strerror(r));
154 goto err;
155 }
156 *key_obj_out = key_obj;
157 return 0;
158 } else if (r) {
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;
181err:
182 sc_close();
183 return -1;
184}
185
186#define SC_USAGE_DECRYPT SC_PKCS15_PRKEY_USAGE_DECRYPT | \
187 SC_PKCS15_PRKEY_USAGE_UNWRAP
188
189static int
190sc_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)
197 return -1;
198 r = sc_prkey_op_init(rsa, &key_obj, SC_USAGE_DECRYPT);
199 if (r)
200 return -1;
201 r = sc_pkcs15_decipher(p15card, key_obj, SC_ALGORITHM_RSA_PAD_PKCS1,
202 from, flen, to, flen);
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;
209err:
210 sc_close();
211 return -1;
212}
213
214#define SC_USAGE_SIGN SC_PKCS15_PRKEY_USAGE_SIGN | \
215 SC_PKCS15_PRKEY_USAGE_SIGNRECOVER
216
217static int
218sc_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
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
231 * if the sign or signrecover flag is set as well.
232 */
233 r = sc_prkey_op_init(rsa, &key_obj, SC_USAGE_SIGN);
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;
249err:
250 sc_close();
251 return 0;
252}
253
254static int
255sc_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
264static int (*orig_finish)(RSA *rsa) = NULL;
265
266static int
267sc_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
284static RSA_METHOD *
285sc_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
308static ENGINE *
309sc_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
329static void
330convert_rsa_to_rsa1(Key * in, Key * out)
331{
332 struct sc_priv_data *priv;
333
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
345static int
346sc_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;
357
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) {
361 logit("Certificate read failed: %s", sc_strerror(r));
362 goto err;
363 }
364 x509 = X509_new();
365 if (x509 == NULL) {
366 r = -1;
367 goto err;
368 }
369 p = cert->data;
370 if (!d2i_X509(&x509, &p, cert->data_len)) {
371 logit("Unable to parse X.509 certificate");
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) {
381 logit("Public key is of unknown type");
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);
399
400 return 0;
401err:
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
411Key **
412sc_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) {
453 logit("No certificates found on smartcard");
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 }
463 if (key_count > 1024)
464 fatal("Too many keys (%u), expected <= 1024", key_count);
465 keys = xcalloc(key_count * 2 + 1, sizeof(Key *));
466 for (i = 0; i < key_count; i++) {
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;
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;
494err:
495 sc_close();
496 return NULL;
497}
498
499int
500sc_put_key(Key *prv, const char *id)
501{
502 error("key uploading not yet supported");
503 return -1;
504}
505
506char *
507sc_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
532#endif /* SMARTCARD */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 23:30:30 +0000