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839fddbe LP |
1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
2 | ||
3 | #include <fcntl.h> | |
4 | ||
5 | #include "ask-password-api.h" | |
6 | #include "escape.h" | |
7 | #include "fd-util.h" | |
8 | #include "io-util.h" | |
9 | #include "memory-util.h" | |
10 | #if HAVE_OPENSSL | |
11 | #include "openssl-util.h" | |
12 | #endif | |
13 | #include "pkcs11-util.h" | |
14 | #include "random-util.h" | |
15 | #include "string-util.h" | |
16 | #include "strv.h" | |
17 | ||
18 | bool pkcs11_uri_valid(const char *uri) { | |
19 | const char *p; | |
20 | ||
21 | /* A very superficial checker for RFC7512 PKCS#11 URI syntax */ | |
22 | ||
23 | if (isempty(uri)) | |
24 | return false; | |
25 | ||
26 | p = startswith(uri, "pkcs11:"); | |
27 | if (!p) | |
28 | return false; | |
29 | ||
30 | if (isempty(p)) | |
31 | return false; | |
32 | ||
33 | if (!in_charset(p, ALPHANUMERICAL "-_?;&%=")) | |
34 | return false; | |
35 | ||
36 | return true; | |
37 | } | |
38 | ||
39 | #if HAVE_P11KIT | |
40 | ||
41 | int uri_from_string(const char *p, P11KitUri **ret) { | |
42 | _cleanup_(p11_kit_uri_freep) P11KitUri *uri = NULL; | |
43 | ||
44 | assert(p); | |
45 | assert(ret); | |
46 | ||
47 | uri = p11_kit_uri_new(); | |
48 | if (!uri) | |
49 | return -ENOMEM; | |
50 | ||
51 | if (p11_kit_uri_parse(p, P11_KIT_URI_FOR_ANY, uri) != P11_KIT_URI_OK) | |
52 | return -EINVAL; | |
53 | ||
54 | *ret = TAKE_PTR(uri); | |
55 | return 0; | |
56 | } | |
57 | ||
58 | P11KitUri *uri_from_module_info(const CK_INFO *info) { | |
59 | P11KitUri *uri; | |
60 | ||
61 | assert(info); | |
62 | ||
63 | uri = p11_kit_uri_new(); | |
64 | if (!uri) | |
65 | return NULL; | |
66 | ||
67 | *p11_kit_uri_get_module_info(uri) = *info; | |
68 | return uri; | |
69 | } | |
70 | ||
71 | P11KitUri *uri_from_slot_info(const CK_SLOT_INFO *slot_info) { | |
72 | P11KitUri *uri; | |
73 | ||
74 | assert(slot_info); | |
75 | ||
76 | uri = p11_kit_uri_new(); | |
77 | if (!uri) | |
78 | return NULL; | |
79 | ||
80 | *p11_kit_uri_get_slot_info(uri) = *slot_info; | |
81 | return uri; | |
82 | } | |
83 | ||
84 | P11KitUri *uri_from_token_info(const CK_TOKEN_INFO *token_info) { | |
85 | P11KitUri *uri; | |
86 | ||
87 | assert(token_info); | |
88 | ||
89 | uri = p11_kit_uri_new(); | |
90 | if (!uri) | |
91 | return NULL; | |
92 | ||
93 | *p11_kit_uri_get_token_info(uri) = *token_info; | |
94 | return uri; | |
95 | } | |
96 | ||
97 | CK_RV pkcs11_get_slot_list_malloc( | |
98 | CK_FUNCTION_LIST *m, | |
99 | CK_SLOT_ID **ret_slotids, | |
100 | CK_ULONG *ret_n_slotids) { | |
101 | ||
102 | CK_RV rv; | |
103 | ||
104 | assert(m); | |
105 | assert(ret_slotids); | |
106 | assert(ret_n_slotids); | |
107 | ||
108 | for (unsigned tries = 0; tries < 16; tries++) { | |
109 | _cleanup_free_ CK_SLOT_ID *slotids = NULL; | |
110 | CK_ULONG n_slotids = 0; | |
111 | ||
112 | rv = m->C_GetSlotList(0, NULL, &n_slotids); | |
113 | if (rv != CKR_OK) | |
114 | return rv; | |
115 | if (n_slotids == 0) { | |
116 | *ret_slotids = NULL; | |
117 | *ret_n_slotids = 0; | |
118 | return CKR_OK; | |
119 | } | |
120 | ||
121 | slotids = new(CK_SLOT_ID, n_slotids); | |
122 | if (!slotids) | |
123 | return CKR_HOST_MEMORY; | |
124 | ||
125 | rv = m->C_GetSlotList(0, slotids, &n_slotids); | |
126 | if (rv == CKR_OK) { | |
127 | *ret_slotids = TAKE_PTR(slotids); | |
128 | *ret_n_slotids = n_slotids; | |
129 | return CKR_OK; | |
130 | } | |
131 | ||
132 | if (rv != CKR_BUFFER_TOO_SMALL) | |
133 | return rv; | |
134 | ||
135 | /* Hu? Maybe somebody plugged something in and things changed? Let's try again */ | |
136 | } | |
137 | ||
138 | return CKR_BUFFER_TOO_SMALL; | |
139 | } | |
140 | ||
141 | char *pkcs11_token_label(const CK_TOKEN_INFO *token_info) { | |
142 | char *t; | |
143 | ||
144 | /* The label is not NUL terminated and likely padded with spaces, let's make a copy here, so that we | |
145 | * can strip that. */ | |
146 | t = strndup((char*) token_info->label, sizeof(token_info->label)); | |
147 | if (!t) | |
148 | return NULL; | |
149 | ||
150 | strstrip(t); | |
151 | return t; | |
152 | } | |
153 | ||
0eb3be46 LP |
154 | char *pkcs11_token_manufacturer_id(const CK_TOKEN_INFO *token_info) { |
155 | char *t; | |
156 | ||
157 | t = strndup((char*) token_info->manufacturerID, sizeof(token_info->manufacturerID)); | |
158 | if (!t) | |
159 | return NULL; | |
160 | ||
161 | strstrip(t); | |
162 | return t; | |
163 | } | |
164 | ||
165 | char *pkcs11_token_model(const CK_TOKEN_INFO *token_info) { | |
166 | char *t; | |
167 | ||
168 | t = strndup((char*) token_info->model, sizeof(token_info->model)); | |
169 | if (!t) | |
170 | return NULL; | |
171 | ||
172 | strstrip(t); | |
173 | return t; | |
174 | } | |
175 | ||
839fddbe LP |
176 | int pkcs11_token_login( |
177 | CK_FUNCTION_LIST *m, | |
178 | CK_SESSION_HANDLE session, | |
179 | CK_SLOT_ID slotid, | |
180 | const CK_TOKEN_INFO *token_info, | |
181 | const char *friendly_name, | |
182 | const char *icon_name, | |
183 | const char *keyname, | |
184 | usec_t until, | |
185 | char **ret_used_pin) { | |
186 | ||
187 | _cleanup_free_ char *token_uri_string = NULL, *token_uri_escaped = NULL, *id = NULL, *token_label = NULL; | |
188 | _cleanup_(p11_kit_uri_freep) P11KitUri *token_uri = NULL; | |
189 | CK_TOKEN_INFO updated_token_info; | |
0eb3be46 | 190 | int uri_result, r; |
839fddbe | 191 | CK_RV rv; |
839fddbe LP |
192 | |
193 | assert(m); | |
194 | assert(token_info); | |
195 | ||
196 | token_label = pkcs11_token_label(token_info); | |
197 | if (!token_label) | |
198 | return log_oom(); | |
199 | ||
200 | token_uri = uri_from_token_info(token_info); | |
201 | if (!token_uri) | |
202 | return log_oom(); | |
203 | ||
204 | uri_result = p11_kit_uri_format(token_uri, P11_KIT_URI_FOR_ANY, &token_uri_string); | |
205 | if (uri_result != P11_KIT_URI_OK) | |
206 | return log_warning_errno(SYNTHETIC_ERRNO(EAGAIN), "Failed to format slot URI: %s", p11_kit_uri_message(uri_result)); | |
207 | ||
208 | if (FLAGS_SET(token_info->flags, CKF_PROTECTED_AUTHENTICATION_PATH)) { | |
209 | rv = m->C_Login(session, CKU_USER, NULL, 0); | |
210 | if (rv != CKR_OK) | |
211 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
212 | "Failed to log into security token '%s': %s", token_label, p11_kit_strerror(rv)); | |
213 | ||
162392b7 | 214 | log_info("Successfully logged into security token '%s' via protected authentication path.", token_label); |
839fddbe LP |
215 | *ret_used_pin = NULL; |
216 | return 0; | |
217 | } | |
218 | ||
219 | if (!FLAGS_SET(token_info->flags, CKF_LOGIN_REQUIRED)) { | |
220 | log_info("No login into security token '%s' required.", token_label); | |
221 | *ret_used_pin = NULL; | |
222 | return 0; | |
223 | } | |
224 | ||
225 | token_uri_escaped = cescape(token_uri_string); | |
226 | if (!token_uri_escaped) | |
227 | return log_oom(); | |
228 | ||
229 | id = strjoin("pkcs11:", token_uri_escaped); | |
230 | if (!id) | |
231 | return log_oom(); | |
232 | ||
233 | for (unsigned tries = 0; tries < 3; tries++) { | |
234 | _cleanup_strv_free_erase_ char **passwords = NULL; | |
839fddbe LP |
235 | char **i, *e; |
236 | ||
839fddbe LP |
237 | e = getenv("PIN"); |
238 | if (e) { | |
239 | passwords = strv_new(e); | |
240 | if (!passwords) | |
241 | return log_oom(); | |
242 | ||
243 | string_erase(e); | |
244 | if (unsetenv("PIN") < 0) | |
245 | return log_error_errno(errno, "Failed to unset $PIN: %m"); | |
246 | } else { | |
c63ec11b LP |
247 | _cleanup_free_ char *text = NULL; |
248 | ||
249 | if (FLAGS_SET(token_info->flags, CKF_USER_PIN_FINAL_TRY)) | |
250 | r = asprintf(&text, | |
251 | "Please enter correct PIN for security token '%s' in order to unlock %s (final try):", | |
252 | token_label, friendly_name); | |
253 | else if (FLAGS_SET(token_info->flags, CKF_USER_PIN_COUNT_LOW)) | |
254 | r = asprintf(&text, | |
255 | "PIN has been entered incorrectly previously, please enter correct PIN for security token '%s' in order to unlock %s:", | |
256 | token_label, friendly_name); | |
257 | else if (tries == 0) | |
258 | r = asprintf(&text, | |
259 | "Please enter PIN for security token '%s' in order to unlock %s:", | |
260 | token_label, friendly_name); | |
261 | else | |
262 | r = asprintf(&text, | |
263 | "Please enter PIN for security token '%s' in order to unlock %s (try #%u):", | |
264 | token_label, friendly_name, tries+1); | |
265 | if (r < 0) | |
266 | return log_oom(); | |
267 | ||
839fddbe LP |
268 | /* We never cache PINs, simply because it's fatal if we use wrong PINs, since usually there are only 3 tries */ |
269 | r = ask_password_auto(text, icon_name, id, keyname, until, 0, &passwords); | |
270 | if (r < 0) | |
271 | return log_error_errno(r, "Failed to query PIN for security token '%s': %m", token_label); | |
272 | } | |
273 | ||
274 | STRV_FOREACH(i, passwords) { | |
275 | rv = m->C_Login(session, CKU_USER, (CK_UTF8CHAR*) *i, strlen(*i)); | |
276 | if (rv == CKR_OK) { | |
277 | ||
278 | if (ret_used_pin) { | |
279 | char *c; | |
280 | ||
281 | c = strdup(*i); | |
282 | if (!c) | |
283 | return log_oom(); | |
284 | ||
285 | *ret_used_pin = c; | |
286 | } | |
287 | ||
288 | log_info("Successfully logged into security token '%s'.", token_label); | |
289 | return 0; | |
290 | } | |
291 | if (rv == CKR_PIN_LOCKED) | |
292 | return log_error_errno(SYNTHETIC_ERRNO(EPERM), | |
293 | "PIN has been locked, please reset PIN of security token '%s'.", token_label); | |
294 | if (!IN_SET(rv, CKR_PIN_INCORRECT, CKR_PIN_LEN_RANGE)) | |
295 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
296 | "Failed to log into security token '%s': %s", token_label, p11_kit_strerror(rv)); | |
297 | ||
298 | /* Referesh the token info, so that we can prompt knowing the new flags if they changed. */ | |
299 | rv = m->C_GetTokenInfo(slotid, &updated_token_info); | |
300 | if (rv != CKR_OK) | |
301 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
302 | "Failed to acquire updated security token information for slot %lu: %s", | |
303 | slotid, p11_kit_strerror(rv)); | |
304 | ||
305 | token_info = &updated_token_info; | |
306 | log_notice("PIN for token '%s' is incorrect, please try again.", token_label); | |
307 | } | |
308 | } | |
309 | ||
310 | return log_error_errno(SYNTHETIC_ERRNO(EPERM), "Too many attempts to log into token '%s'.", token_label); | |
311 | } | |
312 | ||
313 | int pkcs11_token_find_x509_certificate( | |
314 | CK_FUNCTION_LIST *m, | |
315 | CK_SESSION_HANDLE session, | |
316 | P11KitUri *search_uri, | |
317 | CK_OBJECT_HANDLE *ret_object) { | |
318 | ||
319 | bool found_class = false, found_certificate_type = false; | |
320 | _cleanup_free_ CK_ATTRIBUTE *attributes_buffer = NULL; | |
321 | CK_ULONG n_attributes, a, n_objects; | |
322 | CK_ATTRIBUTE *attributes = NULL; | |
323 | CK_OBJECT_HANDLE objects[2]; | |
324 | CK_RV rv, rv2; | |
325 | ||
326 | assert(m); | |
327 | assert(search_uri); | |
328 | assert(ret_object); | |
329 | ||
330 | attributes = p11_kit_uri_get_attributes(search_uri, &n_attributes); | |
331 | for (a = 0; a < n_attributes; a++) { | |
332 | ||
333 | /* We use the URI's included match attributes, but make them more strict. This allows users | |
334 | * to specify a token URL instead of an object URL and the right thing should happen if | |
335 | * there's only one suitable key on the token. */ | |
336 | ||
337 | switch (attributes[a].type) { | |
338 | ||
339 | case CKA_CLASS: { | |
340 | CK_OBJECT_CLASS c; | |
341 | ||
342 | if (attributes[a].ulValueLen != sizeof(c)) | |
343 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid PKCS#11 CKA_CLASS attribute size."); | |
344 | ||
345 | memcpy(&c, attributes[a].pValue, sizeof(c)); | |
346 | if (c != CKO_CERTIFICATE) | |
347 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Selected PKCS#11 object is not an X.509 certificate, refusing."); | |
348 | ||
349 | found_class = true; | |
350 | break; | |
351 | } | |
352 | ||
353 | case CKA_CERTIFICATE_TYPE: { | |
354 | CK_CERTIFICATE_TYPE t; | |
355 | ||
356 | if (attributes[a].ulValueLen != sizeof(t)) | |
357 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid PKCS#11 CKA_CERTIFICATE_TYPE attribute size."); | |
358 | ||
359 | memcpy(&t, attributes[a].pValue, sizeof(t)); | |
360 | if (t != CKC_X_509) | |
361 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Selected PKCS#11 object is not an X.509 certificate, refusing."); | |
362 | ||
363 | found_certificate_type = true; | |
364 | break; | |
365 | }} | |
366 | } | |
367 | ||
368 | if (!found_class || !found_certificate_type) { | |
369 | /* Hmm, let's slightly extend the attribute list we search for */ | |
370 | ||
371 | attributes_buffer = new(CK_ATTRIBUTE, n_attributes + !found_class + !found_certificate_type); | |
372 | if (!attributes_buffer) | |
373 | return log_oom(); | |
374 | ||
375 | memcpy(attributes_buffer, attributes, sizeof(CK_ATTRIBUTE) * n_attributes); | |
376 | ||
377 | if (!found_class) { | |
378 | static const CK_OBJECT_CLASS class = CKO_CERTIFICATE; | |
379 | ||
380 | attributes_buffer[n_attributes++] = (CK_ATTRIBUTE) { | |
381 | .type = CKA_CLASS, | |
382 | .pValue = (CK_OBJECT_CLASS*) &class, | |
383 | .ulValueLen = sizeof(class), | |
384 | }; | |
385 | } | |
386 | ||
387 | if (!found_certificate_type) { | |
388 | static const CK_CERTIFICATE_TYPE type = CKC_X_509; | |
389 | ||
390 | attributes_buffer[n_attributes++] = (CK_ATTRIBUTE) { | |
391 | .type = CKA_CERTIFICATE_TYPE, | |
392 | .pValue = (CK_CERTIFICATE_TYPE*) &type, | |
393 | .ulValueLen = sizeof(type), | |
394 | }; | |
395 | } | |
396 | ||
397 | attributes = attributes_buffer; | |
398 | } | |
399 | ||
400 | rv = m->C_FindObjectsInit(session, attributes, n_attributes); | |
401 | if (rv != CKR_OK) | |
402 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
403 | "Failed to initialize object find call: %s", p11_kit_strerror(rv)); | |
404 | ||
405 | rv = m->C_FindObjects(session, objects, ELEMENTSOF(objects), &n_objects); | |
406 | rv2 = m->C_FindObjectsFinal(session); | |
407 | if (rv != CKR_OK) | |
408 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
409 | "Failed to find objects: %s", p11_kit_strerror(rv)); | |
410 | if (rv2 != CKR_OK) | |
411 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
412 | "Failed to finalize object find call: %s", p11_kit_strerror(rv)); | |
413 | if (n_objects == 0) | |
414 | return log_error_errno(SYNTHETIC_ERRNO(ENOENT), | |
415 | "Failed to find selected X509 certificate on token."); | |
416 | if (n_objects > 1) | |
417 | return log_error_errno(SYNTHETIC_ERRNO(ENOTUNIQ), | |
418 | "Configured URI matches multiple certificates, refusing."); | |
419 | ||
420 | *ret_object = objects[0]; | |
421 | return 0; | |
422 | } | |
423 | ||
424 | #if HAVE_OPENSSL | |
425 | int pkcs11_token_read_x509_certificate( | |
426 | CK_FUNCTION_LIST *m, | |
427 | CK_SESSION_HANDLE session, | |
428 | CK_OBJECT_HANDLE object, | |
429 | X509 **ret_cert) { | |
430 | ||
431 | _cleanup_free_ void *buffer = NULL; | |
432 | _cleanup_free_ char *t = NULL; | |
433 | CK_ATTRIBUTE attribute = { | |
434 | .type = CKA_VALUE | |
435 | }; | |
436 | CK_RV rv; | |
437 | _cleanup_(X509_freep) X509 *x509 = NULL; | |
438 | X509_NAME *name = NULL; | |
439 | const unsigned char *p; | |
440 | ||
441 | rv = m->C_GetAttributeValue(session, object, &attribute, 1); | |
442 | if (rv != CKR_OK) | |
443 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
444 | "Failed to read X.509 certificate size off token: %s", p11_kit_strerror(rv)); | |
445 | ||
446 | buffer = malloc(attribute.ulValueLen); | |
447 | if (!buffer) | |
448 | return log_oom(); | |
449 | ||
450 | attribute.pValue = buffer; | |
451 | ||
452 | rv = m->C_GetAttributeValue(session, object, &attribute, 1); | |
453 | if (rv != CKR_OK) | |
454 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
455 | "Failed to read X.509 certificate data off token: %s", p11_kit_strerror(rv)); | |
456 | ||
457 | p = attribute.pValue; | |
458 | x509 = d2i_X509(NULL, &p, attribute.ulValueLen); | |
459 | if (!x509) | |
460 | return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), "Failed parse X.509 certificate."); | |
461 | ||
462 | name = X509_get_subject_name(x509); | |
463 | if (!name) | |
464 | return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), "Failed to acquire X.509 subject name."); | |
465 | ||
466 | t = X509_NAME_oneline(name, NULL, 0); | |
467 | if (!t) | |
468 | return log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to format X.509 subject name as string."); | |
469 | ||
470 | log_debug("Using X.509 certificate issued for '%s'.", t); | |
471 | ||
472 | *ret_cert = TAKE_PTR(x509); | |
473 | return 0; | |
474 | } | |
475 | #endif | |
476 | ||
477 | int pkcs11_token_find_private_key( | |
478 | CK_FUNCTION_LIST *m, | |
479 | CK_SESSION_HANDLE session, | |
480 | P11KitUri *search_uri, | |
481 | CK_OBJECT_HANDLE *ret_object) { | |
482 | ||
483 | bool found_decrypt = false, found_class = false, found_key_type = false; | |
484 | _cleanup_free_ CK_ATTRIBUTE *attributes_buffer = NULL; | |
485 | CK_ULONG n_attributes, a, n_objects; | |
486 | CK_ATTRIBUTE *attributes = NULL; | |
487 | CK_OBJECT_HANDLE objects[2]; | |
488 | CK_RV rv, rv2; | |
489 | ||
490 | assert(m); | |
491 | assert(search_uri); | |
492 | assert(ret_object); | |
493 | ||
494 | attributes = p11_kit_uri_get_attributes(search_uri, &n_attributes); | |
495 | for (a = 0; a < n_attributes; a++) { | |
496 | ||
497 | /* We use the URI's included match attributes, but make them more strict. This allows users | |
498 | * to specify a token URL instead of an object URL and the right thing should happen if | |
499 | * there's only one suitable key on the token. */ | |
500 | ||
501 | switch (attributes[a].type) { | |
502 | ||
503 | case CKA_CLASS: { | |
504 | CK_OBJECT_CLASS c; | |
505 | ||
506 | if (attributes[a].ulValueLen != sizeof(c)) | |
507 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid PKCS#11 CKA_CLASS attribute size."); | |
508 | ||
509 | memcpy(&c, attributes[a].pValue, sizeof(c)); | |
510 | if (c != CKO_PRIVATE_KEY) | |
511 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
512 | "Selected PKCS#11 object is not a private key, refusing."); | |
513 | ||
514 | found_class = true; | |
515 | break; | |
516 | } | |
517 | ||
518 | case CKA_DECRYPT: { | |
519 | CK_BBOOL b; | |
520 | ||
521 | if (attributes[a].ulValueLen != sizeof(b)) | |
522 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid PKCS#11 CKA_DECRYPT attribute size."); | |
523 | ||
524 | memcpy(&b, attributes[a].pValue, sizeof(b)); | |
525 | if (!b) | |
526 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
527 | "Selected PKCS#11 object is not suitable for decryption, refusing."); | |
528 | ||
529 | found_decrypt = true; | |
530 | break; | |
531 | } | |
532 | ||
533 | case CKA_KEY_TYPE: { | |
534 | CK_KEY_TYPE t; | |
535 | ||
536 | if (attributes[a].ulValueLen != sizeof(t)) | |
537 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid PKCS#11 CKA_KEY_TYPE attribute size."); | |
538 | ||
539 | memcpy(&t, attributes[a].pValue, sizeof(t)); | |
540 | if (t != CKK_RSA) | |
541 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Selected PKCS#11 object is not an RSA key, refusing."); | |
542 | ||
543 | found_key_type = true; | |
544 | break; | |
545 | }} | |
546 | } | |
547 | ||
548 | if (!found_decrypt || !found_class || !found_key_type) { | |
549 | /* Hmm, let's slightly extend the attribute list we search for */ | |
550 | ||
551 | attributes_buffer = new(CK_ATTRIBUTE, n_attributes + !found_decrypt + !found_class + !found_key_type); | |
552 | if (!attributes_buffer) | |
553 | return log_oom(); | |
554 | ||
555 | memcpy(attributes_buffer, attributes, sizeof(CK_ATTRIBUTE) * n_attributes); | |
556 | ||
557 | if (!found_decrypt) { | |
558 | static const CK_BBOOL yes = true; | |
559 | ||
560 | attributes_buffer[n_attributes++] = (CK_ATTRIBUTE) { | |
561 | .type = CKA_DECRYPT, | |
562 | .pValue = (CK_BBOOL*) &yes, | |
563 | .ulValueLen = sizeof(yes), | |
564 | }; | |
565 | } | |
566 | ||
567 | if (!found_class) { | |
568 | static const CK_OBJECT_CLASS class = CKO_PRIVATE_KEY; | |
569 | ||
570 | attributes_buffer[n_attributes++] = (CK_ATTRIBUTE) { | |
571 | .type = CKA_CLASS, | |
572 | .pValue = (CK_OBJECT_CLASS*) &class, | |
573 | .ulValueLen = sizeof(class), | |
574 | }; | |
575 | } | |
576 | ||
577 | if (!found_key_type) { | |
578 | static const CK_KEY_TYPE type = CKK_RSA; | |
579 | ||
580 | attributes_buffer[n_attributes++] = (CK_ATTRIBUTE) { | |
581 | .type = CKA_KEY_TYPE, | |
582 | .pValue = (CK_KEY_TYPE*) &type, | |
583 | .ulValueLen = sizeof(type), | |
584 | }; | |
585 | } | |
586 | ||
587 | attributes = attributes_buffer; | |
588 | } | |
589 | ||
590 | rv = m->C_FindObjectsInit(session, attributes, n_attributes); | |
591 | if (rv != CKR_OK) | |
592 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
593 | "Failed to initialize object find call: %s", p11_kit_strerror(rv)); | |
594 | ||
595 | rv = m->C_FindObjects(session, objects, ELEMENTSOF(objects), &n_objects); | |
596 | rv2 = m->C_FindObjectsFinal(session); | |
597 | if (rv != CKR_OK) | |
598 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
599 | "Failed to find objects: %s", p11_kit_strerror(rv)); | |
600 | if (rv2 != CKR_OK) | |
601 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
602 | "Failed to finalize object find call: %s", p11_kit_strerror(rv)); | |
603 | if (n_objects == 0) | |
604 | return log_error_errno(SYNTHETIC_ERRNO(ENOENT), | |
605 | "Failed to find selected private key suitable for decryption on token."); | |
606 | if (n_objects > 1) | |
607 | return log_error_errno(SYNTHETIC_ERRNO(ENOTUNIQ), | |
608 | "Configured private key URI matches multiple keys, refusing."); | |
609 | ||
610 | *ret_object = objects[0]; | |
611 | return 0; | |
612 | } | |
613 | ||
614 | int pkcs11_token_decrypt_data( | |
615 | CK_FUNCTION_LIST *m, | |
616 | CK_SESSION_HANDLE session, | |
617 | CK_OBJECT_HANDLE object, | |
618 | const void *encrypted_data, | |
619 | size_t encrypted_data_size, | |
620 | void **ret_decrypted_data, | |
621 | size_t *ret_decrypted_data_size) { | |
622 | ||
623 | static const CK_MECHANISM mechanism = { | |
624 | .mechanism = CKM_RSA_PKCS | |
625 | }; | |
626 | _cleanup_(erase_and_freep) CK_BYTE *dbuffer = NULL; | |
627 | CK_ULONG dbuffer_size = 0; | |
628 | CK_RV rv; | |
629 | ||
630 | assert(m); | |
631 | assert(encrypted_data); | |
632 | assert(encrypted_data_size > 0); | |
633 | assert(ret_decrypted_data); | |
634 | assert(ret_decrypted_data_size); | |
635 | ||
636 | rv = m->C_DecryptInit(session, (CK_MECHANISM*) &mechanism, object); | |
637 | if (rv != CKR_OK) | |
638 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
639 | "Failed to initialize decryption on security token: %s", p11_kit_strerror(rv)); | |
640 | ||
641 | dbuffer_size = encrypted_data_size; /* Start with something reasonable */ | |
642 | dbuffer = malloc(dbuffer_size); | |
643 | if (!dbuffer) | |
644 | return log_oom(); | |
645 | ||
646 | rv = m->C_Decrypt(session, (CK_BYTE*) encrypted_data, encrypted_data_size, dbuffer, &dbuffer_size); | |
647 | if (rv == CKR_BUFFER_TOO_SMALL) { | |
648 | erase_and_free(dbuffer); | |
649 | ||
650 | dbuffer = malloc(dbuffer_size); | |
651 | if (!dbuffer) | |
652 | return log_oom(); | |
653 | ||
654 | rv = m->C_Decrypt(session, (CK_BYTE*) encrypted_data, encrypted_data_size, dbuffer, &dbuffer_size); | |
655 | } | |
656 | if (rv != CKR_OK) | |
657 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
658 | "Failed to decrypt key on security token: %s", p11_kit_strerror(rv)); | |
659 | ||
660 | log_info("Successfully decrypted key with security token."); | |
661 | ||
662 | *ret_decrypted_data = TAKE_PTR(dbuffer); | |
663 | *ret_decrypted_data_size = dbuffer_size; | |
664 | return 0; | |
665 | } | |
666 | ||
667 | int pkcs11_token_acquire_rng( | |
668 | CK_FUNCTION_LIST *m, | |
669 | CK_SESSION_HANDLE session) { | |
670 | ||
671 | _cleanup_free_ void *buffer = NULL; | |
672 | _cleanup_close_ int fd = -1; | |
673 | size_t rps; | |
674 | CK_RV rv; | |
675 | int r; | |
676 | ||
677 | assert(m); | |
678 | ||
679 | /* While we are at it, let's read some RNG data from the PKCS#11 token and pass it to the kernel | |
680 | * random pool. This should be cheap if we are talking to the device already. Note that we don't | |
681 | * credit any entropy, since we don't know about the quality of the pkcs#11 token's RNG. Why bother | |
682 | * at all? There are two sides to the argument whether to generate private keys on tokens or on the | |
683 | * host. By crediting some data from the token RNG to the host's pool we at least can say that any | |
684 | * key generated from it is at least as good as both sources individually. */ | |
685 | ||
686 | rps = random_pool_size(); | |
687 | ||
688 | buffer = malloc(rps); | |
689 | if (!buffer) | |
690 | return log_oom(); | |
691 | ||
692 | rv = m->C_GenerateRandom(session, buffer, rps); | |
693 | if (rv != CKR_OK) | |
694 | return log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), | |
695 | "Failed to generate RNG data on security token: %s", p11_kit_strerror(rv)); | |
696 | ||
697 | fd = open("/dev/urandom", O_WRONLY|O_CLOEXEC|O_NOCTTY); | |
698 | if (fd < 0) | |
699 | return log_debug_errno(errno, "Failed to open /dev/urandom for writing: %m"); | |
700 | ||
701 | r = loop_write(fd, buffer, rps, false); | |
702 | if (r < 0) | |
703 | return log_debug_errno(r, "Failed to write PKCS#11 acquired random data to /dev/urandom: %m"); | |
704 | ||
705 | log_debug("Successfully written %zu bytes random data acquired via PKCS#11 to kernel random pool.", rps); | |
706 | ||
707 | return 0; | |
708 | } | |
709 | ||
710 | static int token_process( | |
711 | CK_FUNCTION_LIST *m, | |
712 | CK_SLOT_ID slotid, | |
713 | const CK_SLOT_INFO *slot_info, | |
714 | const CK_TOKEN_INFO *token_info, | |
715 | P11KitUri *search_uri, | |
716 | pkcs11_find_token_callback_t callback, | |
717 | void *userdata) { | |
718 | ||
719 | _cleanup_free_ char *token_label = NULL; | |
720 | CK_SESSION_HANDLE session; | |
721 | CK_RV rv; | |
722 | int r; | |
723 | ||
724 | assert(m); | |
725 | assert(slot_info); | |
726 | assert(token_info); | |
839fddbe LP |
727 | |
728 | token_label = pkcs11_token_label(token_info); | |
729 | if (!token_label) | |
730 | return log_oom(); | |
731 | ||
732 | rv = m->C_OpenSession(slotid, CKF_SERIAL_SESSION, NULL, NULL, &session); | |
733 | if (rv != CKR_OK) | |
734 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
735 | "Failed to create session for security token '%s': %s", token_label, p11_kit_strerror(rv)); | |
736 | ||
737 | if (callback) | |
738 | r = callback(m, session, slotid, slot_info, token_info, search_uri, userdata); | |
739 | else | |
740 | r = 1; /* if not callback was specified, just say we found what we were looking for */ | |
741 | ||
742 | rv = m->C_CloseSession(session); | |
743 | if (rv != CKR_OK) | |
744 | log_warning("Failed to close session on PKCS#11 token, ignoring: %s", p11_kit_strerror(rv)); | |
745 | ||
746 | return r; | |
747 | } | |
748 | ||
749 | static int slot_process( | |
750 | CK_FUNCTION_LIST *m, | |
751 | CK_SLOT_ID slotid, | |
752 | P11KitUri *search_uri, | |
753 | pkcs11_find_token_callback_t callback, | |
754 | void *userdata) { | |
755 | ||
756 | _cleanup_(p11_kit_uri_freep) P11KitUri* slot_uri = NULL, *token_uri = NULL; | |
757 | _cleanup_free_ char *token_uri_string = NULL; | |
758 | CK_TOKEN_INFO token_info; | |
759 | CK_SLOT_INFO slot_info; | |
760 | int uri_result; | |
761 | CK_RV rv; | |
762 | ||
763 | assert(m); | |
839fddbe LP |
764 | |
765 | /* We return -EAGAIN for all failures we can attribute to a specific slot in some way, so that the | |
766 | * caller might try other slots before giving up. */ | |
767 | ||
768 | rv = m->C_GetSlotInfo(slotid, &slot_info); | |
769 | if (rv != CKR_OK) { | |
770 | log_warning("Failed to acquire slot info for slot %lu, ignoring slot: %s", slotid, p11_kit_strerror(rv)); | |
771 | return -EAGAIN; | |
772 | } | |
773 | ||
774 | slot_uri = uri_from_slot_info(&slot_info); | |
775 | if (!slot_uri) | |
776 | return log_oom(); | |
777 | ||
778 | if (DEBUG_LOGGING) { | |
779 | _cleanup_free_ char *slot_uri_string = NULL; | |
780 | ||
781 | uri_result = p11_kit_uri_format(slot_uri, P11_KIT_URI_FOR_ANY, &slot_uri_string); | |
782 | if (uri_result != P11_KIT_URI_OK) { | |
783 | log_warning("Failed to format slot URI, ignoring slot: %s", p11_kit_uri_message(uri_result)); | |
784 | return -EAGAIN; | |
785 | } | |
786 | ||
787 | log_debug("Found slot with URI %s", slot_uri_string); | |
788 | } | |
789 | ||
790 | rv = m->C_GetTokenInfo(slotid, &token_info); | |
791 | if (rv == CKR_TOKEN_NOT_PRESENT) { | |
792 | log_debug("Token not present in slot, ignoring."); | |
793 | return -EAGAIN; | |
794 | } else if (rv != CKR_OK) { | |
795 | log_warning("Failed to acquire token info for slot %lu, ignoring slot: %s", slotid, p11_kit_strerror(rv)); | |
796 | return -EAGAIN; | |
797 | } | |
798 | ||
799 | token_uri = uri_from_token_info(&token_info); | |
800 | if (!token_uri) | |
801 | return log_oom(); | |
802 | ||
803 | uri_result = p11_kit_uri_format(token_uri, P11_KIT_URI_FOR_ANY, &token_uri_string); | |
804 | if (uri_result != P11_KIT_URI_OK) { | |
805 | log_warning("Failed to format slot URI: %s", p11_kit_uri_message(uri_result)); | |
806 | return -EAGAIN; | |
807 | } | |
808 | ||
0eb3be46 | 809 | if (search_uri && !p11_kit_uri_match_token_info(search_uri, &token_info)) { |
839fddbe LP |
810 | log_debug("Found non-matching token with URI %s.", token_uri_string); |
811 | return -EAGAIN; | |
812 | } | |
813 | ||
814 | log_debug("Found matching token with URI %s.", token_uri_string); | |
815 | ||
816 | return token_process( | |
817 | m, | |
818 | slotid, | |
819 | &slot_info, | |
820 | &token_info, | |
821 | search_uri, | |
822 | callback, | |
823 | userdata); | |
824 | } | |
825 | ||
826 | static int module_process( | |
827 | CK_FUNCTION_LIST *m, | |
828 | P11KitUri *search_uri, | |
829 | pkcs11_find_token_callback_t callback, | |
830 | void *userdata) { | |
831 | ||
832 | _cleanup_free_ char *name = NULL, *module_uri_string = NULL; | |
833 | _cleanup_(p11_kit_uri_freep) P11KitUri* module_uri = NULL; | |
834 | _cleanup_free_ CK_SLOT_ID *slotids = NULL; | |
835 | CK_ULONG n_slotids = 0; | |
836 | int uri_result; | |
837 | CK_INFO info; | |
838 | size_t k; | |
839 | CK_RV rv; | |
840 | int r; | |
841 | ||
842 | assert(m); | |
839fddbe LP |
843 | |
844 | /* We ignore most errors from modules here, in order to skip over faulty modules: one faulty module | |
845 | * should not have the effect that we don't try the others anymore. We indicate such per-module | |
846 | * failures with -EAGAIN, which let's the caller try the next module. */ | |
847 | ||
848 | name = p11_kit_module_get_name(m); | |
849 | if (!name) | |
850 | return log_oom(); | |
851 | ||
852 | log_debug("Trying PKCS#11 module %s.", name); | |
853 | ||
854 | rv = m->C_GetInfo(&info); | |
855 | if (rv != CKR_OK) { | |
856 | log_warning("Failed to get info on PKCS#11 module, ignoring module: %s", p11_kit_strerror(rv)); | |
857 | return -EAGAIN; | |
858 | } | |
859 | ||
860 | module_uri = uri_from_module_info(&info); | |
861 | if (!module_uri) | |
862 | return log_oom(); | |
863 | ||
864 | uri_result = p11_kit_uri_format(module_uri, P11_KIT_URI_FOR_ANY, &module_uri_string); | |
865 | if (uri_result != P11_KIT_URI_OK) { | |
866 | log_warning("Failed to format module URI, ignoring module: %s", p11_kit_uri_message(uri_result)); | |
867 | return -EAGAIN; | |
868 | } | |
869 | ||
870 | log_debug("Found module with URI %s", module_uri_string); | |
871 | ||
872 | rv = pkcs11_get_slot_list_malloc(m, &slotids, &n_slotids); | |
873 | if (rv != CKR_OK) { | |
874 | log_warning("Failed to get slot list, ignoring module: %s", p11_kit_strerror(rv)); | |
875 | return -EAGAIN; | |
876 | } | |
877 | if (n_slotids == 0) { | |
878 | log_debug("This module has no slots? Ignoring module."); | |
879 | return -EAGAIN; | |
880 | } | |
881 | ||
882 | for (k = 0; k < n_slotids; k++) { | |
883 | r = slot_process( | |
884 | m, | |
885 | slotids[k], | |
886 | search_uri, | |
887 | callback, | |
888 | userdata); | |
889 | if (r != -EAGAIN) | |
890 | return r; | |
891 | } | |
892 | ||
893 | return -EAGAIN; | |
894 | } | |
895 | ||
896 | int pkcs11_find_token( | |
897 | const char *pkcs11_uri, | |
898 | pkcs11_find_token_callback_t callback, | |
899 | void *userdata) { | |
900 | ||
901 | _cleanup_(p11_kit_modules_finalize_and_releasep) CK_FUNCTION_LIST **modules = NULL; | |
902 | _cleanup_(p11_kit_uri_freep) P11KitUri *search_uri = NULL; | |
903 | int r; | |
904 | ||
839fddbe LP |
905 | /* Execute the specified callback for each matching token found. If nothing is found returns |
906 | * -EAGAIN. Logs about all errors, except for EAGAIN, which the caller has to log about. */ | |
907 | ||
0eb3be46 LP |
908 | if (pkcs11_uri) { |
909 | r = uri_from_string(pkcs11_uri, &search_uri); | |
910 | if (r < 0) | |
911 | return log_error_errno(r, "Failed to parse PKCS#11 URI '%s': %m", pkcs11_uri); | |
912 | } | |
839fddbe LP |
913 | |
914 | modules = p11_kit_modules_load_and_initialize(0); | |
915 | if (!modules) | |
916 | return log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to initialize pkcs11 modules"); | |
917 | ||
918 | for (CK_FUNCTION_LIST **i = modules; *i; i++) { | |
919 | r = module_process( | |
920 | *i, | |
921 | search_uri, | |
922 | callback, | |
923 | userdata); | |
924 | if (r != -EAGAIN) | |
925 | return r; | |
926 | } | |
927 | ||
928 | return -EAGAIN; | |
929 | } | |
930 | ||
931 | #endif |