diff options
Diffstat (limited to 'scard-opensc.c')
-rw-r--r-- | scard-opensc.c | 462 |
1 files changed, 462 insertions, 0 deletions
diff --git a/scard-opensc.c b/scard-opensc.c new file mode 100644 index 000000000..2a18bebd6 --- /dev/null +++ b/scard-opensc.c | |||
@@ -0,0 +1,462 @@ | |||
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 <openssl/evp.h> | ||
30 | #include <openssl/x509.h> | ||
31 | |||
32 | #include <opensc.h> | ||
33 | #include <opensc-pkcs15.h> | ||
34 | |||
35 | #include "key.h" | ||
36 | #include "log.h" | ||
37 | #include "xmalloc.h" | ||
38 | #include "readpass.h" | ||
39 | #include "scard.h" | ||
40 | |||
41 | #if OPENSSL_VERSION_NUMBER >= 0x00907000L | ||
42 | #define USE_ENGINE | ||
43 | #define RSA_get_default_method RSA_get_default_openssl_method | ||
44 | #else | ||
45 | #endif | ||
46 | |||
47 | #ifdef USE_ENGINE | ||
48 | #include <openssl/engine.h> | ||
49 | #define sc_get_rsa sc_get_engine | ||
50 | #else | ||
51 | #define sc_get_rsa sc_get_rsa_method | ||
52 | #endif | ||
53 | |||
54 | static int sc_reader_id; | ||
55 | static sc_context_t *ctx = NULL; | ||
56 | static sc_card_t *card = NULL; | ||
57 | static sc_pkcs15_card_t *p15card = NULL; | ||
58 | |||
59 | static char *sc_pin = NULL; | ||
60 | |||
61 | struct sc_priv_data | ||
62 | { | ||
63 | struct sc_pkcs15_id cert_id; | ||
64 | int ref_count; | ||
65 | }; | ||
66 | |||
67 | void | ||
68 | sc_close(void) | ||
69 | { | ||
70 | if (p15card) { | ||
71 | sc_pkcs15_unbind(p15card); | ||
72 | p15card = NULL; | ||
73 | } | ||
74 | if (card) { | ||
75 | sc_disconnect_card(card, 0); | ||
76 | card = NULL; | ||
77 | } | ||
78 | if (ctx) { | ||
79 | sc_release_context(ctx); | ||
80 | ctx = NULL; | ||
81 | } | ||
82 | } | ||
83 | |||
84 | static int | ||
85 | sc_init(void) | ||
86 | { | ||
87 | int r; | ||
88 | |||
89 | r = sc_establish_context(&ctx, "openssh"); | ||
90 | if (r) | ||
91 | goto err; | ||
92 | r = sc_connect_card(ctx->reader[sc_reader_id], 0, &card); | ||
93 | if (r) | ||
94 | goto err; | ||
95 | r = sc_pkcs15_bind(card, &p15card); | ||
96 | if (r) | ||
97 | goto err; | ||
98 | return 0; | ||
99 | err: | ||
100 | sc_close(); | ||
101 | return r; | ||
102 | } | ||
103 | |||
104 | /* private key operations */ | ||
105 | |||
106 | static int | ||
107 | sc_prkey_op_init(RSA *rsa, struct sc_pkcs15_object **key_obj_out) | ||
108 | { | ||
109 | int r; | ||
110 | struct sc_priv_data *priv; | ||
111 | struct sc_pkcs15_object *key_obj; | ||
112 | struct sc_pkcs15_prkey_info *key; | ||
113 | struct sc_pkcs15_object *pin_obj; | ||
114 | struct sc_pkcs15_pin_info *pin; | ||
115 | |||
116 | priv = (struct sc_priv_data *) RSA_get_app_data(rsa); | ||
117 | if (priv == NULL) | ||
118 | return -1; | ||
119 | if (p15card == NULL) { | ||
120 | sc_close(); | ||
121 | r = sc_init(); | ||
122 | if (r) { | ||
123 | error("SmartCard init failed: %s", sc_strerror(r)); | ||
124 | goto err; | ||
125 | } | ||
126 | } | ||
127 | r = sc_pkcs15_find_prkey_by_id(p15card, &priv->cert_id, &key_obj); | ||
128 | if (r) { | ||
129 | error("Unable to find private key from SmartCard: %s", | ||
130 | sc_strerror(r)); | ||
131 | goto err; | ||
132 | } | ||
133 | key = key_obj->data; | ||
134 | r = sc_pkcs15_find_pin_by_auth_id(p15card, &key_obj->auth_id, | ||
135 | &pin_obj); | ||
136 | if (r) { | ||
137 | error("Unable to find PIN object from SmartCard: %s", | ||
138 | sc_strerror(r)); | ||
139 | goto err; | ||
140 | } | ||
141 | pin = pin_obj->data; | ||
142 | r = sc_lock(card); | ||
143 | if (r) { | ||
144 | error("Unable to lock smartcard: %s", sc_strerror(r)); | ||
145 | goto err; | ||
146 | } | ||
147 | if (sc_pin != NULL) { | ||
148 | r = sc_pkcs15_verify_pin(p15card, pin, sc_pin, | ||
149 | strlen(sc_pin)); | ||
150 | if (r) { | ||
151 | sc_unlock(card); | ||
152 | error("PIN code verification failed: %s", | ||
153 | sc_strerror(r)); | ||
154 | goto err; | ||
155 | } | ||
156 | } | ||
157 | *key_obj_out = key_obj; | ||
158 | return 0; | ||
159 | err: | ||
160 | sc_close(); | ||
161 | return -1; | ||
162 | } | ||
163 | |||
164 | static int | ||
165 | sc_private_decrypt(int flen, u_char *from, u_char *to, RSA *rsa, | ||
166 | int padding) | ||
167 | { | ||
168 | struct sc_pkcs15_object *key_obj; | ||
169 | int r; | ||
170 | |||
171 | if (padding != RSA_PKCS1_PADDING) | ||
172 | return -1; | ||
173 | r = sc_prkey_op_init(rsa, &key_obj); | ||
174 | if (r) | ||
175 | return -1; | ||
176 | r = sc_pkcs15_decipher(p15card, key_obj, from, flen, to, flen); | ||
177 | sc_unlock(card); | ||
178 | if (r < 0) { | ||
179 | error("sc_pkcs15_decipher() failed: %s", sc_strerror(r)); | ||
180 | goto err; | ||
181 | } | ||
182 | return r; | ||
183 | err: | ||
184 | sc_close(); | ||
185 | return -1; | ||
186 | } | ||
187 | |||
188 | static int | ||
189 | sc_sign(int type, u_char *m, unsigned int m_len, | ||
190 | unsigned char *sigret, unsigned int *siglen, RSA *rsa) | ||
191 | { | ||
192 | struct sc_pkcs15_object *key_obj; | ||
193 | int r; | ||
194 | unsigned long flags = 0; | ||
195 | |||
196 | r = sc_prkey_op_init(rsa, &key_obj); | ||
197 | if (r) | ||
198 | return -1; | ||
199 | /* FIXME: length of sigret correct? */ | ||
200 | /* FIXME: check 'type' and modify flags accordingly */ | ||
201 | flags = SC_ALGORITHM_RSA_PAD_PKCS1 | SC_ALGORITHM_RSA_HASH_SHA1; | ||
202 | r = sc_pkcs15_compute_signature(p15card, key_obj, flags, | ||
203 | m, m_len, sigret, RSA_size(rsa)); | ||
204 | sc_unlock(card); | ||
205 | if (r < 0) { | ||
206 | error("sc_pkcs15_compute_signature() failed: %s", | ||
207 | sc_strerror(r)); | ||
208 | goto err; | ||
209 | } | ||
210 | *siglen = r; | ||
211 | return 1; | ||
212 | err: | ||
213 | sc_close(); | ||
214 | return 0; | ||
215 | } | ||
216 | |||
217 | static int | ||
218 | sc_private_encrypt(int flen, u_char *from, u_char *to, RSA *rsa, | ||
219 | int padding) | ||
220 | { | ||
221 | error("Private key encryption not supported"); | ||
222 | return -1; | ||
223 | } | ||
224 | |||
225 | /* called on free */ | ||
226 | |||
227 | static int (*orig_finish)(RSA *rsa) = NULL; | ||
228 | |||
229 | static int | ||
230 | sc_finish(RSA *rsa) | ||
231 | { | ||
232 | struct sc_priv_data *priv; | ||
233 | |||
234 | priv = RSA_get_app_data(rsa); | ||
235 | priv->ref_count--; | ||
236 | if (priv->ref_count == 0) { | ||
237 | free(priv); | ||
238 | sc_close(); | ||
239 | } | ||
240 | if (orig_finish) | ||
241 | orig_finish(rsa); | ||
242 | return 1; | ||
243 | } | ||
244 | |||
245 | /* engine for overloading private key operations */ | ||
246 | |||
247 | static RSA_METHOD * | ||
248 | sc_get_rsa_method(void) | ||
249 | { | ||
250 | static RSA_METHOD smart_rsa; | ||
251 | const RSA_METHOD *def = RSA_get_default_method(); | ||
252 | |||
253 | /* use the OpenSSL version */ | ||
254 | memcpy(&smart_rsa, def, sizeof(smart_rsa)); | ||
255 | |||
256 | smart_rsa.name = "opensc"; | ||
257 | |||
258 | /* overload */ | ||
259 | smart_rsa.rsa_priv_enc = sc_private_encrypt; | ||
260 | smart_rsa.rsa_priv_dec = sc_private_decrypt; | ||
261 | smart_rsa.rsa_sign = sc_sign; | ||
262 | |||
263 | /* save original */ | ||
264 | orig_finish = def->finish; | ||
265 | smart_rsa.finish = sc_finish; | ||
266 | |||
267 | return &smart_rsa; | ||
268 | } | ||
269 | |||
270 | #ifdef USE_ENGINE | ||
271 | static ENGINE * | ||
272 | sc_get_engine(void) | ||
273 | { | ||
274 | static ENGINE *smart_engine = NULL; | ||
275 | |||
276 | if ((smart_engine = ENGINE_new()) == NULL) | ||
277 | fatal("ENGINE_new failed"); | ||
278 | |||
279 | ENGINE_set_id(smart_engine, "opensc"); | ||
280 | ENGINE_set_name(smart_engine, "OpenSC"); | ||
281 | |||
282 | ENGINE_set_RSA(smart_engine, sc_get_rsa_method()); | ||
283 | ENGINE_set_DSA(smart_engine, DSA_get_default_openssl_method()); | ||
284 | ENGINE_set_DH(smart_engine, DH_get_default_openssl_method()); | ||
285 | ENGINE_set_RAND(smart_engine, RAND_SSLeay()); | ||
286 | ENGINE_set_BN_mod_exp(smart_engine, BN_mod_exp); | ||
287 | |||
288 | return smart_engine; | ||
289 | } | ||
290 | #endif | ||
291 | |||
292 | static void | ||
293 | convert_rsa_to_rsa1(Key * in, Key * out) | ||
294 | { | ||
295 | struct sc_priv_data *priv; | ||
296 | |||
297 | out->rsa->flags = in->rsa->flags; | ||
298 | out->flags = in->flags; | ||
299 | RSA_set_method(out->rsa, RSA_get_method(in->rsa)); | ||
300 | BN_copy(out->rsa->n, in->rsa->n); | ||
301 | BN_copy(out->rsa->e, in->rsa->e); | ||
302 | priv = RSA_get_app_data(in->rsa); | ||
303 | priv->ref_count++; | ||
304 | RSA_set_app_data(out->rsa, priv); | ||
305 | return; | ||
306 | } | ||
307 | |||
308 | static int | ||
309 | sc_read_pubkey(Key * k, const struct sc_pkcs15_object *cert_obj) | ||
310 | { | ||
311 | int r; | ||
312 | sc_pkcs15_cert_t *cert = NULL; | ||
313 | struct sc_priv_data *priv = NULL; | ||
314 | sc_pkcs15_cert_info_t *cinfo = cert_obj->data; | ||
315 | |||
316 | X509 *x509 = NULL; | ||
317 | EVP_PKEY *pubkey = NULL; | ||
318 | u8 *p; | ||
319 | char *tmp; | ||
320 | |||
321 | debug("sc_read_pubkey() with cert id %02X", cinfo->id.value[0]); | ||
322 | r = sc_pkcs15_read_certificate(p15card, cinfo, &cert); | ||
323 | if (r) { | ||
324 | log("Certificate read failed: %s", sc_strerror(r)); | ||
325 | goto err; | ||
326 | } | ||
327 | x509 = X509_new(); | ||
328 | if (x509 == NULL) { | ||
329 | r = -1; | ||
330 | goto err; | ||
331 | } | ||
332 | p = cert->data; | ||
333 | if (!d2i_X509(&x509, &p, cert->data_len)) { | ||
334 | log("Unable to parse X.509 certificate"); | ||
335 | r = -1; | ||
336 | goto err; | ||
337 | } | ||
338 | sc_pkcs15_free_certificate(cert); | ||
339 | cert = NULL; | ||
340 | pubkey = X509_get_pubkey(x509); | ||
341 | X509_free(x509); | ||
342 | x509 = NULL; | ||
343 | if (pubkey->type != EVP_PKEY_RSA) { | ||
344 | log("Public key is of unknown type"); | ||
345 | r = -1; | ||
346 | goto err; | ||
347 | } | ||
348 | k->rsa = EVP_PKEY_get1_RSA(pubkey); | ||
349 | EVP_PKEY_free(pubkey); | ||
350 | |||
351 | k->rsa->flags |= RSA_FLAG_SIGN_VER; | ||
352 | RSA_set_method(k->rsa, sc_get_rsa_method()); | ||
353 | priv = xmalloc(sizeof(struct sc_priv_data)); | ||
354 | priv->cert_id = cinfo->id; | ||
355 | priv->ref_count = 1; | ||
356 | RSA_set_app_data(k->rsa, priv); | ||
357 | |||
358 | k->flags = KEY_FLAG_EXT; | ||
359 | tmp = key_fingerprint(k, SSH_FP_MD5, SSH_FP_HEX); | ||
360 | debug("fingerprint %d %s", key_size(k), tmp); | ||
361 | xfree(tmp); | ||
362 | |||
363 | return 0; | ||
364 | err: | ||
365 | if (cert) | ||
366 | sc_pkcs15_free_certificate(cert); | ||
367 | if (pubkey) | ||
368 | EVP_PKEY_free(pubkey); | ||
369 | if (x509) | ||
370 | X509_free(x509); | ||
371 | return r; | ||
372 | } | ||
373 | |||
374 | Key ** | ||
375 | sc_get_keys(const char *id, const char *pin) | ||
376 | { | ||
377 | Key *k, **keys; | ||
378 | int i, r, real_count = 0, key_count; | ||
379 | sc_pkcs15_id_t cert_id; | ||
380 | sc_pkcs15_object_t *certs[32]; | ||
381 | char *buf = xstrdup(id), *p; | ||
382 | |||
383 | debug("sc_get_keys called: id = %s", id); | ||
384 | |||
385 | if (sc_pin != NULL) | ||
386 | xfree(sc_pin); | ||
387 | sc_pin = (pin == NULL) ? NULL : xstrdup(pin); | ||
388 | |||
389 | cert_id.len = 0; | ||
390 | if ((p = strchr(buf, ':')) != NULL) { | ||
391 | *p = 0; | ||
392 | p++; | ||
393 | sc_pkcs15_hex_string_to_id(p, &cert_id); | ||
394 | } | ||
395 | r = sscanf(buf, "%d", &sc_reader_id); | ||
396 | xfree(buf); | ||
397 | if (r != 1) | ||
398 | goto err; | ||
399 | if (p15card == NULL) { | ||
400 | sc_close(); | ||
401 | r = sc_init(); | ||
402 | if (r) { | ||
403 | error("Smartcard init failed: %s", sc_strerror(r)); | ||
404 | goto err; | ||
405 | } | ||
406 | } | ||
407 | if (cert_id.len) { | ||
408 | r = sc_pkcs15_find_cert_by_id(p15card, &cert_id, &certs[0]); | ||
409 | if (r < 0) | ||
410 | goto err; | ||
411 | key_count = 1; | ||
412 | } else { | ||
413 | r = sc_pkcs15_get_objects(p15card, SC_PKCS15_TYPE_CERT_X509, | ||
414 | certs, 32); | ||
415 | if (r == 0) { | ||
416 | log("No certificates found on smartcard"); | ||
417 | r = -1; | ||
418 | goto err; | ||
419 | } else if (r < 0) { | ||
420 | error("Certificate enumeration failed: %s", | ||
421 | sc_strerror(r)); | ||
422 | goto err; | ||
423 | } | ||
424 | key_count = r; | ||
425 | } | ||
426 | /* FIXME: only keep entries with a corresponding private key */ | ||
427 | keys = xmalloc(sizeof(Key *) * (key_count*2+1)); | ||
428 | for (i = 0; i < key_count; i++) { | ||
429 | k = key_new(KEY_RSA); | ||
430 | if (k == NULL) | ||
431 | break; | ||
432 | r = sc_read_pubkey(k, certs[i]); | ||
433 | if (r) { | ||
434 | error("sc_read_pubkey failed: %s", sc_strerror(r)); | ||
435 | key_free(k); | ||
436 | continue; | ||
437 | } | ||
438 | keys[real_count] = k; | ||
439 | real_count++; | ||
440 | k = key_new(KEY_RSA1); | ||
441 | if (k == NULL) | ||
442 | break; | ||
443 | convert_rsa_to_rsa1(keys[real_count-1], k); | ||
444 | keys[real_count] = k; | ||
445 | real_count++; | ||
446 | } | ||
447 | keys[real_count] = NULL; | ||
448 | |||
449 | return keys; | ||
450 | err: | ||
451 | sc_close(); | ||
452 | return NULL; | ||
453 | } | ||
454 | |||
455 | int | ||
456 | sc_put_key(Key *prv, const char *id) | ||
457 | { | ||
458 | error("key uploading not yet supported"); | ||
459 | return -1; | ||
460 | } | ||
461 | |||
462 | #endif /* SMARTCARD */ | ||