blob: ff59b29c49d15afcebe49c9144fc5183a7174618 [file] [log] [blame]
Ben Lindstroma42694f2002-04-05 16:11:45 +00001/*
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
Ben Lindstrom8d601752002-04-06 18:19:38 +000041#if OPENSSL_VERSION_NUMBER < 0x00907000L && defined(CRYPTO_LOCK_ENGINE)
Ben Lindstroma42694f2002-04-05 16:11:45 +000042#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
54static int sc_reader_id;
55static sc_context_t *ctx = NULL;
56static sc_card_t *card = NULL;
57static sc_pkcs15_card_t *p15card = NULL;
58
59static char *sc_pin = NULL;
60
61struct sc_priv_data
62{
63 struct sc_pkcs15_id cert_id;
64 int ref_count;
65};
66
67void
68sc_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
84static int
85sc_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;
99err:
100 sc_close();
101 return r;
102}
103
104/* private key operations */
105
106static int
107sc_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;
159err:
160 sc_close();
161 return -1;
162}
163
164static int
165sc_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;
183err:
184 sc_close();
185 return -1;
186}
187
188static int
189sc_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;
212err:
213 sc_close();
214 return 0;
215}
216
217static int
218sc_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
227static int (*orig_finish)(RSA *rsa) = NULL;
228
229static int
230sc_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
247static RSA_METHOD *
248sc_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
271static ENGINE *
272sc_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
292static void
293convert_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
308static int
309sc_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;
364err:
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
374Key **
375sc_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;
450err:
451 sc_close();
452 return NULL;
453}
454
455int
456sc_put_key(Key *prv, const char *id)
457{
458 error("key uploading not yet supported");
459 return -1;
460}
461
462#endif /* SMARTCARD */