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OSSL_STORE: Make it possible to attach an OSSL_STORE to an opened BIO
[thirdparty/openssl.git] / crypto / store / loader_file.c
1 /*
2 * Copyright 2016-2020 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include "e_os.h"
11 #include <string.h>
12 #include <sys/stat.h>
13 #include <ctype.h>
14 #include <assert.h>
15
16 #include <openssl/bio.h>
17 #include <openssl/dsa.h> /* For d2i_DSAPrivateKey */
18 #include <openssl/err.h>
19 #include <openssl/evp.h>
20 #include <openssl/pem.h>
21 #include <openssl/pkcs12.h> /* For the PKCS8 stuff o.O */
22 #include <openssl/rsa.h> /* For d2i_RSAPrivateKey */
23 #include <openssl/safestack.h>
24 #include <openssl/store.h>
25 #include <openssl/ui.h>
26 #include <openssl/x509.h> /* For the PKCS8 stuff o.O */
27 #include "crypto/asn1.h"
28 #include "crypto/ctype.h"
29 #include "internal/o_dir.h"
30 #include "internal/cryptlib.h"
31 #include "crypto/store.h"
32 #include "crypto/evp.h"
33 #include "store_local.h"
34
35 DEFINE_STACK_OF(X509)
36
37 #ifdef _WIN32
38 # define stat _stat
39 #endif
40
41 #ifndef S_ISDIR
42 # define S_ISDIR(a) (((a) & S_IFMT) == S_IFDIR)
43 #endif
44
45 /*-
46 * Password prompting
47 * ------------------
48 */
49
50 static char *file_get_pass(const UI_METHOD *ui_method, char *pass,
51 size_t maxsize, const char *prompt_info, void *data)
52 {
53 UI *ui = UI_new();
54 char *prompt = NULL;
55
56 if (ui == NULL) {
57 OSSL_STOREerr(OSSL_STORE_F_FILE_GET_PASS, ERR_R_MALLOC_FAILURE);
58 return NULL;
59 }
60
61 if (ui_method != NULL)
62 UI_set_method(ui, ui_method);
63 UI_add_user_data(ui, data);
64
65 if ((prompt = UI_construct_prompt(ui, "pass phrase",
66 prompt_info)) == NULL) {
67 OSSL_STOREerr(OSSL_STORE_F_FILE_GET_PASS, ERR_R_MALLOC_FAILURE);
68 pass = NULL;
69 } else if (!UI_add_input_string(ui, prompt, UI_INPUT_FLAG_DEFAULT_PWD,
70 pass, 0, maxsize - 1)) {
71 OSSL_STOREerr(OSSL_STORE_F_FILE_GET_PASS, ERR_R_UI_LIB);
72 pass = NULL;
73 } else {
74 switch (UI_process(ui)) {
75 case -2:
76 OSSL_STOREerr(OSSL_STORE_F_FILE_GET_PASS,
77 OSSL_STORE_R_UI_PROCESS_INTERRUPTED_OR_CANCELLED);
78 pass = NULL;
79 break;
80 case -1:
81 OSSL_STOREerr(OSSL_STORE_F_FILE_GET_PASS, ERR_R_UI_LIB);
82 pass = NULL;
83 break;
84 default:
85 break;
86 }
87 }
88
89 OPENSSL_free(prompt);
90 UI_free(ui);
91 return pass;
92 }
93
94 struct pem_pass_data {
95 const UI_METHOD *ui_method;
96 void *data;
97 const char *prompt_info;
98 };
99
100 static int file_fill_pem_pass_data(struct pem_pass_data *pass_data,
101 const char *prompt_info,
102 const UI_METHOD *ui_method, void *ui_data)
103 {
104 if (pass_data == NULL)
105 return 0;
106 pass_data->ui_method = ui_method;
107 pass_data->data = ui_data;
108 pass_data->prompt_info = prompt_info;
109 return 1;
110 }
111
112 /* This is used anywhere a pem_password_cb is needed */
113 static int file_get_pem_pass(char *buf, int num, int w, void *data)
114 {
115 struct pem_pass_data *pass_data = data;
116 char *pass = file_get_pass(pass_data->ui_method, buf, num,
117 pass_data->prompt_info, pass_data->data);
118
119 return pass == NULL ? 0 : strlen(pass);
120 }
121
122 /*-
123 * The file scheme decoders
124 * ------------------------
125 *
126 * Each possible data type has its own decoder, which either operates
127 * through a given PEM name, or attempts to decode to see if the blob
128 * it's given is decodable for its data type. The assumption is that
129 * only the correct data type will match the content.
130 */
131
132 /*-
133 * The try_decode function is called to check if the blob of data can
134 * be used by this handler, and if it can, decodes it into a supported
135 * OpenSSL type and returns a OSSL_STORE_INFO with the decoded data.
136 * Input:
137 * pem_name: If this blob comes from a PEM file, this holds
138 * the PEM name. If it comes from another type of
139 * file, this is NULL.
140 * pem_header: If this blob comes from a PEM file, this holds
141 * the PEM headers. If it comes from another type of
142 * file, this is NULL.
143 * blob: The blob of data to match with what this handler
144 * can use.
145 * len: The length of the blob.
146 * handler_ctx: For a handler marked repeatable, this pointer can
147 * be used to create a context for the handler. IT IS
148 * THE HANDLER'S RESPONSIBILITY TO CREATE AND DESTROY
149 * THIS CONTEXT APPROPRIATELY, i.e. create on first call
150 * and destroy when about to return NULL.
151 * matchcount: A pointer to an int to count matches for this data.
152 * Usually becomes 0 (no match) or 1 (match!), but may
153 * be higher in the (unlikely) event that the data matches
154 * more than one possibility. The int will always be
155 * zero when the function is called.
156 * ui_method: Application UI method for getting a password, pin
157 * or any other interactive data.
158 * ui_data: Application data to be passed to ui_method when
159 * it's called.
160 * libctx: The library context to be used if applicable
161 * propq: The property query string for any algorithm fetches
162 * Output:
163 * a OSSL_STORE_INFO
164 */
165 typedef OSSL_STORE_INFO *(*file_try_decode_fn)(const char *pem_name,
166 const char *pem_header,
167 const unsigned char *blob,
168 size_t len, void **handler_ctx,
169 int *matchcount,
170 const UI_METHOD *ui_method,
171 void *ui_data,
172 OPENSSL_CTX *libctx,
173 const char *propq);
174 /*
175 * The eof function should return 1 if there's no more data to be found
176 * with the handler_ctx, otherwise 0. This is only used when the handler is
177 * marked repeatable.
178 */
179 typedef int (*file_eof_fn)(void *handler_ctx);
180 /*
181 * The destroy_ctx function is used to destroy the handler_ctx that was
182 * initiated by a repeatable try_decode function. This is only used when
183 * the handler is marked repeatable.
184 */
185 typedef void (*file_destroy_ctx_fn)(void **handler_ctx);
186
187 typedef struct file_handler_st {
188 const char *name;
189 file_try_decode_fn try_decode;
190 file_eof_fn eof;
191 file_destroy_ctx_fn destroy_ctx;
192
193 /* flags */
194 int repeatable;
195 } FILE_HANDLER;
196
197 /*
198 * PKCS#12 decoder. It operates by decoding all of the blob content,
199 * extracting all the interesting data from it and storing them internally,
200 * then serving them one piece at a time.
201 */
202 static OSSL_STORE_INFO *try_decode_PKCS12(const char *pem_name,
203 const char *pem_header,
204 const unsigned char *blob,
205 size_t len, void **pctx,
206 int *matchcount,
207 const UI_METHOD *ui_method,
208 void *ui_data, OPENSSL_CTX *libctx,
209 const char *propq)
210 {
211 OSSL_STORE_INFO *store_info = NULL;
212 STACK_OF(OSSL_STORE_INFO) *ctx = *pctx;
213
214 if (ctx == NULL) {
215 /* Initial parsing */
216 PKCS12 *p12;
217 int ok = 0;
218
219 if (pem_name != NULL)
220 /* No match, there is no PEM PKCS12 tag */
221 return NULL;
222
223 if ((p12 = d2i_PKCS12(NULL, &blob, len)) != NULL) {
224 char *pass = NULL;
225 char tpass[PEM_BUFSIZE];
226 EVP_PKEY *pkey = NULL;
227 X509 *cert = NULL;
228 STACK_OF(X509) *chain = NULL;
229
230 *matchcount = 1;
231
232 if (PKCS12_verify_mac(p12, "", 0)
233 || PKCS12_verify_mac(p12, NULL, 0)) {
234 pass = "";
235 } else {
236 if ((pass = file_get_pass(ui_method, tpass, PEM_BUFSIZE,
237 "PKCS12 import password",
238 ui_data)) == NULL) {
239 OSSL_STOREerr(OSSL_STORE_F_TRY_DECODE_PKCS12,
240 OSSL_STORE_R_PASSPHRASE_CALLBACK_ERROR);
241 goto p12_end;
242 }
243 if (!PKCS12_verify_mac(p12, pass, strlen(pass))) {
244 OSSL_STOREerr(OSSL_STORE_F_TRY_DECODE_PKCS12,
245 OSSL_STORE_R_ERROR_VERIFYING_PKCS12_MAC);
246 goto p12_end;
247 }
248 }
249
250 if (PKCS12_parse(p12, pass, &pkey, &cert, &chain)) {
251 OSSL_STORE_INFO *osi_pkey = NULL;
252 OSSL_STORE_INFO *osi_cert = NULL;
253 OSSL_STORE_INFO *osi_ca = NULL;
254
255 if ((ctx = sk_OSSL_STORE_INFO_new_null()) != NULL
256 && (osi_pkey = OSSL_STORE_INFO_new_PKEY(pkey)) != NULL
257 && sk_OSSL_STORE_INFO_push(ctx, osi_pkey) != 0
258 && (osi_cert = OSSL_STORE_INFO_new_CERT(cert)) != NULL
259 && sk_OSSL_STORE_INFO_push(ctx, osi_cert) != 0) {
260 ok = 1;
261 osi_pkey = NULL;
262 osi_cert = NULL;
263
264 while(sk_X509_num(chain) > 0) {
265 X509 *ca = sk_X509_value(chain, 0);
266
267 if ((osi_ca = OSSL_STORE_INFO_new_CERT(ca)) == NULL
268 || sk_OSSL_STORE_INFO_push(ctx, osi_ca) == 0) {
269 ok = 0;
270 break;
271 }
272 osi_ca = NULL;
273 (void)sk_X509_shift(chain);
274 }
275 }
276 if (!ok) {
277 OSSL_STORE_INFO_free(osi_ca);
278 OSSL_STORE_INFO_free(osi_cert);
279 OSSL_STORE_INFO_free(osi_pkey);
280 sk_OSSL_STORE_INFO_pop_free(ctx, OSSL_STORE_INFO_free);
281 EVP_PKEY_free(pkey);
282 X509_free(cert);
283 sk_X509_pop_free(chain, X509_free);
284 ctx = NULL;
285 }
286 *pctx = ctx;
287 }
288 }
289 p12_end:
290 PKCS12_free(p12);
291 if (!ok)
292 return NULL;
293 }
294
295 if (ctx != NULL) {
296 *matchcount = 1;
297 store_info = sk_OSSL_STORE_INFO_shift(ctx);
298 }
299
300 return store_info;
301 }
302
303 static int eof_PKCS12(void *ctx_)
304 {
305 STACK_OF(OSSL_STORE_INFO) *ctx = ctx_;
306
307 return ctx == NULL || sk_OSSL_STORE_INFO_num(ctx) == 0;
308 }
309
310 static void destroy_ctx_PKCS12(void **pctx)
311 {
312 STACK_OF(OSSL_STORE_INFO) *ctx = *pctx;
313
314 sk_OSSL_STORE_INFO_pop_free(ctx, OSSL_STORE_INFO_free);
315 *pctx = NULL;
316 }
317
318 static FILE_HANDLER PKCS12_handler = {
319 "PKCS12",
320 try_decode_PKCS12,
321 eof_PKCS12,
322 destroy_ctx_PKCS12,
323 1 /* repeatable */
324 };
325
326 /*
327 * Encrypted PKCS#8 decoder. It operates by just decrypting the given blob
328 * into a new blob, which is returned as an EMBEDDED STORE_INFO. The whole
329 * decoding process will then start over with the new blob.
330 */
331 static OSSL_STORE_INFO *try_decode_PKCS8Encrypted(const char *pem_name,
332 const char *pem_header,
333 const unsigned char *blob,
334 size_t len, void **pctx,
335 int *matchcount,
336 const UI_METHOD *ui_method,
337 void *ui_data,
338 OPENSSL_CTX *libctx,
339 const char *propq)
340 {
341 X509_SIG *p8 = NULL;
342 char kbuf[PEM_BUFSIZE];
343 char *pass = NULL;
344 const X509_ALGOR *dalg = NULL;
345 const ASN1_OCTET_STRING *doct = NULL;
346 OSSL_STORE_INFO *store_info = NULL;
347 BUF_MEM *mem = NULL;
348 unsigned char *new_data = NULL;
349 int new_data_len;
350
351 if (pem_name != NULL) {
352 if (strcmp(pem_name, PEM_STRING_PKCS8) != 0)
353 return NULL;
354 *matchcount = 1;
355 }
356
357 if ((p8 = d2i_X509_SIG(NULL, &blob, len)) == NULL)
358 return NULL;
359
360 *matchcount = 1;
361
362 if ((mem = BUF_MEM_new()) == NULL) {
363 OSSL_STOREerr(OSSL_STORE_F_TRY_DECODE_PKCS8ENCRYPTED,
364 ERR_R_MALLOC_FAILURE);
365 goto nop8;
366 }
367
368 if ((pass = file_get_pass(ui_method, kbuf, PEM_BUFSIZE,
369 "PKCS8 decrypt password", ui_data)) == NULL) {
370 OSSL_STOREerr(OSSL_STORE_F_TRY_DECODE_PKCS8ENCRYPTED,
371 OSSL_STORE_R_BAD_PASSWORD_READ);
372 goto nop8;
373 }
374
375 X509_SIG_get0(p8, &dalg, &doct);
376 if (!PKCS12_pbe_crypt(dalg, pass, strlen(pass), doct->data, doct->length,
377 &new_data, &new_data_len, 0))
378 goto nop8;
379
380 mem->data = (char *)new_data;
381 mem->max = mem->length = (size_t)new_data_len;
382 X509_SIG_free(p8);
383
384 store_info = ossl_store_info_new_EMBEDDED(PEM_STRING_PKCS8INF, mem);
385 if (store_info == NULL) {
386 OSSL_STOREerr(OSSL_STORE_F_TRY_DECODE_PKCS8ENCRYPTED,
387 ERR_R_MALLOC_FAILURE);
388 goto nop8;
389 }
390
391 return store_info;
392 nop8:
393 X509_SIG_free(p8);
394 BUF_MEM_free(mem);
395 return NULL;
396 }
397
398 static FILE_HANDLER PKCS8Encrypted_handler = {
399 "PKCS8Encrypted",
400 try_decode_PKCS8Encrypted
401 };
402
403 /*
404 * Private key decoder. Decodes all sorts of private keys, both PKCS#8
405 * encoded ones and old style PEM ones (with the key type is encoded into
406 * the PEM name).
407 */
408 int pem_check_suffix(const char *pem_str, const char *suffix);
409 static OSSL_STORE_INFO *try_decode_PrivateKey(const char *pem_name,
410 const char *pem_header,
411 const unsigned char *blob,
412 size_t len, void **pctx,
413 int *matchcount,
414 const UI_METHOD *ui_method,
415 void *ui_data, OPENSSL_CTX *libctx,
416 const char *propq)
417 {
418 OSSL_STORE_INFO *store_info = NULL;
419 EVP_PKEY *pkey = NULL;
420 const EVP_PKEY_ASN1_METHOD *ameth = NULL;
421
422 if (pem_name != NULL) {
423 if (strcmp(pem_name, PEM_STRING_PKCS8INF) == 0) {
424 PKCS8_PRIV_KEY_INFO *p8inf =
425 d2i_PKCS8_PRIV_KEY_INFO(NULL, &blob, len);
426
427 *matchcount = 1;
428 if (p8inf != NULL)
429 pkey = evp_pkcs82pkey_int(p8inf, libctx, propq);
430 PKCS8_PRIV_KEY_INFO_free(p8inf);
431 } else {
432 int slen;
433
434 if ((slen = pem_check_suffix(pem_name, "PRIVATE KEY")) > 0
435 && (ameth = EVP_PKEY_asn1_find_str(NULL, pem_name,
436 slen)) != NULL) {
437 *matchcount = 1;
438 pkey = d2i_PrivateKey_ex(ameth->pkey_id, NULL, &blob, len,
439 libctx, propq);
440 }
441 }
442 } else {
443 int i;
444
445 for (i = 0; i < EVP_PKEY_asn1_get_count(); i++) {
446 EVP_PKEY *tmp_pkey = NULL;
447 const unsigned char *tmp_blob = blob;
448
449 ameth = EVP_PKEY_asn1_get0(i);
450 if (ameth->pkey_flags & ASN1_PKEY_ALIAS)
451 continue;
452
453 tmp_pkey = d2i_PrivateKey_ex(ameth->pkey_id, NULL, &tmp_blob, len,
454 libctx, propq);
455 if (tmp_pkey != NULL) {
456 if (pkey != NULL)
457 EVP_PKEY_free(tmp_pkey);
458 else
459 pkey = tmp_pkey;
460 (*matchcount)++;
461 }
462 }
463
464 if (*matchcount > 1) {
465 EVP_PKEY_free(pkey);
466 pkey = NULL;
467 }
468 }
469 if (pkey == NULL)
470 /* No match */
471 return NULL;
472
473 store_info = OSSL_STORE_INFO_new_PKEY(pkey);
474 if (store_info == NULL)
475 EVP_PKEY_free(pkey);
476
477 return store_info;
478 }
479
480 static FILE_HANDLER PrivateKey_handler = {
481 "PrivateKey",
482 try_decode_PrivateKey
483 };
484
485 /*
486 * Public key decoder. Only supports SubjectPublicKeyInfo formatted keys.
487 */
488 static OSSL_STORE_INFO *try_decode_PUBKEY(const char *pem_name,
489 const char *pem_header,
490 const unsigned char *blob,
491 size_t len, void **pctx,
492 int *matchcount,
493 const UI_METHOD *ui_method,
494 void *ui_data, OPENSSL_CTX *libctx,
495 const char *propq)
496 {
497 OSSL_STORE_INFO *store_info = NULL;
498 EVP_PKEY *pkey = NULL;
499
500 if (pem_name != NULL) {
501 if (strcmp(pem_name, PEM_STRING_PUBLIC) != 0)
502 /* No match */
503 return NULL;
504 *matchcount = 1;
505 }
506
507 if ((pkey = d2i_PUBKEY(NULL, &blob, len)) != NULL) {
508 *matchcount = 1;
509 store_info = OSSL_STORE_INFO_new_PKEY(pkey);
510 }
511
512 return store_info;
513 }
514
515 static FILE_HANDLER PUBKEY_handler = {
516 "PUBKEY",
517 try_decode_PUBKEY
518 };
519
520 /*
521 * Key parameter decoder.
522 */
523 static OSSL_STORE_INFO *try_decode_params(const char *pem_name,
524 const char *pem_header,
525 const unsigned char *blob,
526 size_t len, void **pctx,
527 int *matchcount,
528 const UI_METHOD *ui_method,
529 void *ui_data, OPENSSL_CTX *libctx,
530 const char *propq)
531 {
532 OSSL_STORE_INFO *store_info = NULL;
533 int slen = 0;
534 EVP_PKEY *pkey = NULL;
535 const EVP_PKEY_ASN1_METHOD *ameth = NULL;
536 int ok = 0;
537
538 if (pem_name != NULL) {
539 if ((slen = pem_check_suffix(pem_name, "PARAMETERS")) == 0)
540 return NULL;
541 *matchcount = 1;
542 }
543
544 if (slen > 0) {
545 if ((pkey = EVP_PKEY_new()) == NULL) {
546 OSSL_STOREerr(OSSL_STORE_F_TRY_DECODE_PARAMS, ERR_R_EVP_LIB);
547 return NULL;
548 }
549
550
551 if (EVP_PKEY_set_type_str(pkey, pem_name, slen)
552 && (ameth = EVP_PKEY_get0_asn1(pkey)) != NULL
553 && ameth->param_decode != NULL
554 && ameth->param_decode(pkey, &blob, len))
555 ok = 1;
556 } else {
557 int i;
558 EVP_PKEY *tmp_pkey = NULL;
559
560 for (i = 0; i < EVP_PKEY_asn1_get_count(); i++) {
561 const unsigned char *tmp_blob = blob;
562
563 if (tmp_pkey == NULL && (tmp_pkey = EVP_PKEY_new()) == NULL) {
564 OSSL_STOREerr(OSSL_STORE_F_TRY_DECODE_PARAMS, ERR_R_EVP_LIB);
565 break;
566 }
567
568 ameth = EVP_PKEY_asn1_get0(i);
569 if (ameth->pkey_flags & ASN1_PKEY_ALIAS)
570 continue;
571
572 if (EVP_PKEY_set_type(tmp_pkey, ameth->pkey_id)
573 && (ameth = EVP_PKEY_get0_asn1(tmp_pkey)) != NULL
574 && ameth->param_decode != NULL
575 && ameth->param_decode(tmp_pkey, &tmp_blob, len)) {
576 if (pkey != NULL)
577 EVP_PKEY_free(tmp_pkey);
578 else
579 pkey = tmp_pkey;
580 tmp_pkey = NULL;
581 (*matchcount)++;
582 }
583 }
584
585 EVP_PKEY_free(tmp_pkey);
586 if (*matchcount == 1) {
587 ok = 1;
588 }
589 }
590
591 if (ok)
592 store_info = OSSL_STORE_INFO_new_PARAMS(pkey);
593 if (store_info == NULL)
594 EVP_PKEY_free(pkey);
595
596 return store_info;
597 }
598
599 static FILE_HANDLER params_handler = {
600 "params",
601 try_decode_params
602 };
603
604 /*
605 * X.509 certificate decoder.
606 */
607 static OSSL_STORE_INFO *try_decode_X509Certificate(const char *pem_name,
608 const char *pem_header,
609 const unsigned char *blob,
610 size_t len, void **pctx,
611 int *matchcount,
612 const UI_METHOD *ui_method,
613 void *ui_data,
614 OPENSSL_CTX *libctx,
615 const char *propq)
616 {
617 OSSL_STORE_INFO *store_info = NULL;
618 X509 *cert = NULL;
619
620 /*
621 * In most cases, we can try to interpret the serialized data as a trusted
622 * cert (X509 + X509_AUX) and fall back to reading it as a normal cert
623 * (just X509), but if the PEM name specifically declares it as a trusted
624 * cert, then no fallback should be engaged. |ignore_trusted| tells if
625 * the fallback can be used (1) or not (0).
626 */
627 int ignore_trusted = 1;
628
629 if (pem_name != NULL) {
630 if (strcmp(pem_name, PEM_STRING_X509_TRUSTED) == 0)
631 ignore_trusted = 0;
632 else if (strcmp(pem_name, PEM_STRING_X509_OLD) != 0
633 && strcmp(pem_name, PEM_STRING_X509) != 0)
634 /* No match */
635 return NULL;
636 *matchcount = 1;
637 }
638
639 if ((cert = d2i_X509_AUX(NULL, &blob, len)) != NULL
640 || (ignore_trusted && (cert = d2i_X509(NULL, &blob, len)) != NULL)) {
641 *matchcount = 1;
642 store_info = OSSL_STORE_INFO_new_CERT(cert);
643 }
644
645 if (store_info == NULL)
646 X509_free(cert);
647
648 return store_info;
649 }
650
651 static FILE_HANDLER X509Certificate_handler = {
652 "X509Certificate",
653 try_decode_X509Certificate
654 };
655
656 /*
657 * X.509 CRL decoder.
658 */
659 static OSSL_STORE_INFO *try_decode_X509CRL(const char *pem_name,
660 const char *pem_header,
661 const unsigned char *blob,
662 size_t len, void **pctx,
663 int *matchcount,
664 const UI_METHOD *ui_method,
665 void *ui_data, OPENSSL_CTX *libctx,
666 const char *propq)
667 {
668 OSSL_STORE_INFO *store_info = NULL;
669 X509_CRL *crl = NULL;
670
671 if (pem_name != NULL) {
672 if (strcmp(pem_name, PEM_STRING_X509_CRL) != 0)
673 /* No match */
674 return NULL;
675 *matchcount = 1;
676 }
677
678 if ((crl = d2i_X509_CRL(NULL, &blob, len)) != NULL) {
679 *matchcount = 1;
680 store_info = OSSL_STORE_INFO_new_CRL(crl);
681 }
682
683 if (store_info == NULL)
684 X509_CRL_free(crl);
685
686 return store_info;
687 }
688
689 static FILE_HANDLER X509CRL_handler = {
690 "X509CRL",
691 try_decode_X509CRL
692 };
693
694 /*
695 * To finish it all off, we collect all the handlers.
696 */
697 static const FILE_HANDLER *file_handlers[] = {
698 &PKCS12_handler,
699 &PKCS8Encrypted_handler,
700 &X509Certificate_handler,
701 &X509CRL_handler,
702 &params_handler,
703 &PUBKEY_handler,
704 &PrivateKey_handler,
705 };
706
707
708 /*-
709 * The loader itself
710 * -----------------
711 */
712
713 struct ossl_store_loader_ctx_st {
714 enum {
715 is_raw = 0,
716 is_pem,
717 is_dir
718 } type;
719 int errcnt;
720 #define FILE_FLAG_SECMEM (1<<0)
721 #define FILE_FLAG_ATTACHED (1<<1)
722 unsigned int flags;
723 union {
724 struct { /* Used with is_raw and is_pem */
725 BIO *file;
726
727 /*
728 * The following are used when the handler is marked as
729 * repeatable
730 */
731 const FILE_HANDLER *last_handler;
732 void *last_handler_ctx;
733 } file;
734 struct { /* Used with is_dir */
735 OPENSSL_DIR_CTX *ctx;
736 int end_reached;
737 char *uri;
738
739 /*
740 * When a search expression is given, these are filled in.
741 * |search_name| contains the file basename to look for.
742 * The string is exactly 8 characters long.
743 */
744 char search_name[9];
745
746 /*
747 * The directory reading utility we have combines opening with
748 * reading the first name. To make sure we can detect the end
749 * at the right time, we read early and cache the name.
750 */
751 const char *last_entry;
752 int last_errno;
753 } dir;
754 } _;
755
756 /* Expected object type. May be unspecified */
757 int expected_type;
758
759 OPENSSL_CTX *libctx;
760 char *propq;
761 };
762
763 static void OSSL_STORE_LOADER_CTX_free(OSSL_STORE_LOADER_CTX *ctx)
764 {
765 if (ctx->type == is_dir) {
766 OPENSSL_free(ctx->_.dir.uri);
767 } else {
768 if (ctx->_.file.last_handler != NULL) {
769 ctx->_.file.last_handler->destroy_ctx(&ctx->_.file.last_handler_ctx);
770 ctx->_.file.last_handler_ctx = NULL;
771 ctx->_.file.last_handler = NULL;
772 }
773 }
774 OPENSSL_free(ctx->propq);
775 OPENSSL_free(ctx);
776 }
777
778 static int file_find_type(OSSL_STORE_LOADER_CTX *ctx)
779 {
780 BIO *buff = NULL;
781 char peekbuf[4096] = { 0, };
782
783 if ((buff = BIO_new(BIO_f_buffer())) == NULL)
784 return 0;
785
786 ctx->_.file.file = BIO_push(buff, ctx->_.file.file);
787 if (BIO_buffer_peek(ctx->_.file.file, peekbuf, sizeof(peekbuf) - 1) > 0) {
788 peekbuf[sizeof(peekbuf) - 1] = '\0';
789 if (strstr(peekbuf, "-----BEGIN ") != NULL)
790 ctx->type = is_pem;
791 }
792 return 1;
793 }
794
795 static OSSL_STORE_LOADER_CTX *file_open(const OSSL_STORE_LOADER *loader,
796 const char *uri,
797 const UI_METHOD *ui_method,
798 void *ui_data)
799 {
800 OSSL_STORE_LOADER_CTX *ctx = NULL;
801 struct stat st;
802 struct {
803 const char *path;
804 unsigned int check_absolute:1;
805 } path_data[2];
806 size_t path_data_n = 0, i;
807 const char *path;
808
809 /*
810 * First step, just take the URI as is.
811 */
812 path_data[path_data_n].check_absolute = 0;
813 path_data[path_data_n++].path = uri;
814
815 /*
816 * Second step, if the URI appears to start with the 'file' scheme,
817 * extract the path and make that the second path to check.
818 * There's a special case if the URI also contains an authority, then
819 * the full URI shouldn't be used as a path anywhere.
820 */
821 if (strncasecmp(uri, "file:", 5) == 0) {
822 const char *p = &uri[5];
823
824 if (strncmp(&uri[5], "//", 2) == 0) {
825 path_data_n--; /* Invalidate using the full URI */
826 if (strncasecmp(&uri[7], "localhost/", 10) == 0) {
827 p = &uri[16];
828 } else if (uri[7] == '/') {
829 p = &uri[7];
830 } else {
831 OSSL_STOREerr(OSSL_STORE_F_FILE_OPEN,
832 OSSL_STORE_R_URI_AUTHORITY_UNSUPPORTED);
833 return NULL;
834 }
835 }
836
837 path_data[path_data_n].check_absolute = 1;
838 #ifdef _WIN32
839 /* Windows file: URIs with a drive letter start with a / */
840 if (p[0] == '/' && p[2] == ':' && p[3] == '/') {
841 char c = ossl_tolower(p[1]);
842
843 if (c >= 'a' && c <= 'z') {
844 p++;
845 /* We know it's absolute, so no need to check */
846 path_data[path_data_n].check_absolute = 0;
847 }
848 }
849 #endif
850 path_data[path_data_n++].path = p;
851 }
852
853
854 for (i = 0, path = NULL; path == NULL && i < path_data_n; i++) {
855 /*
856 * If the scheme "file" was an explicit part of the URI, the path must
857 * be absolute. So says RFC 8089
858 */
859 if (path_data[i].check_absolute && path_data[i].path[0] != '/') {
860 OSSL_STOREerr(OSSL_STORE_F_FILE_OPEN,
861 OSSL_STORE_R_PATH_MUST_BE_ABSOLUTE);
862 ERR_add_error_data(1, path_data[i].path);
863 return NULL;
864 }
865
866 if (stat(path_data[i].path, &st) < 0) {
867 ERR_raise_data(ERR_LIB_SYS, errno,
868 "calling stat(%s)",
869 path_data[i].path);
870 } else {
871 path = path_data[i].path;
872 }
873 }
874 if (path == NULL) {
875 return NULL;
876 }
877
878 /* Successfully found a working path, clear possible collected errors */
879 ERR_clear_error();
880
881 ctx = OPENSSL_zalloc(sizeof(*ctx));
882 if (ctx == NULL) {
883 OSSL_STOREerr(OSSL_STORE_F_FILE_OPEN, ERR_R_MALLOC_FAILURE);
884 return NULL;
885 }
886
887 if (S_ISDIR(st.st_mode)) {
888 /*
889 * Try to copy everything, even if we know that some of them must be
890 * NULL for the moment. This prevents errors in the future, when more
891 * components may be used.
892 */
893 ctx->_.dir.uri = OPENSSL_strdup(uri);
894 ctx->type = is_dir;
895
896 if (ctx->_.dir.uri == NULL)
897 goto err;
898
899 ctx->_.dir.last_entry = OPENSSL_DIR_read(&ctx->_.dir.ctx, path);
900 ctx->_.dir.last_errno = errno;
901 if (ctx->_.dir.last_entry == NULL) {
902 if (ctx->_.dir.last_errno != 0) {
903 char errbuf[256];
904 OSSL_STOREerr(OSSL_STORE_F_FILE_OPEN, ERR_R_SYS_LIB);
905 errno = ctx->_.dir.last_errno;
906 if (openssl_strerror_r(errno, errbuf, sizeof(errbuf)))
907 ERR_add_error_data(1, errbuf);
908 goto err;
909 }
910 ctx->_.dir.end_reached = 1;
911 }
912 } else if ((ctx->_.file.file = BIO_new_file(path, "rb")) == NULL
913 || !file_find_type(ctx)) {
914 BIO_free_all(ctx->_.file.file);
915 goto err;
916 }
917
918 return ctx;
919 err:
920 OSSL_STORE_LOADER_CTX_free(ctx);
921 return NULL;
922 }
923
924 static OSSL_STORE_LOADER_CTX *file_attach(const OSSL_STORE_LOADER *loader,
925 BIO *bp, OPENSSL_CTX *libctx,
926 const char *propq,
927 const UI_METHOD *ui_method,
928 void *ui_data)
929 {
930 OSSL_STORE_LOADER_CTX *ctx;
931
932 if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL
933 || (propq != NULL && (ctx->propq = OPENSSL_strdup(propq)) == NULL)) {
934 OSSL_STOREerr(OSSL_STORE_F_FILE_ATTACH, ERR_R_MALLOC_FAILURE);
935 OSSL_STORE_LOADER_CTX_free(ctx);
936 return NULL;
937 }
938
939 ctx->libctx = libctx;
940 ctx->flags |= FILE_FLAG_ATTACHED;
941 ctx->_.file.file = bp;
942 if (!file_find_type(ctx)) {
943 /* Safety measure */
944 ctx->_.file.file = NULL;
945 OSSL_STORE_LOADER_CTX_free(ctx);
946 ctx = NULL;
947 }
948
949 return ctx;
950 }
951
952 static int file_ctrl(OSSL_STORE_LOADER_CTX *ctx, int cmd, va_list args)
953 {
954 int ret = 1;
955
956 switch (cmd) {
957 case OSSL_STORE_C_USE_SECMEM:
958 {
959 int on = *(va_arg(args, int *));
960
961 switch (on) {
962 case 0:
963 ctx->flags &= ~FILE_FLAG_SECMEM;
964 break;
965 case 1:
966 ctx->flags |= FILE_FLAG_SECMEM;
967 break;
968 default:
969 OSSL_STOREerr(OSSL_STORE_F_FILE_CTRL,
970 ERR_R_PASSED_INVALID_ARGUMENT);
971 ret = 0;
972 break;
973 }
974 }
975 break;
976 default:
977 break;
978 }
979
980 return ret;
981 }
982
983 static int file_expect(OSSL_STORE_LOADER_CTX *ctx, int expected)
984 {
985 ctx->expected_type = expected;
986 return 1;
987 }
988
989 static int file_find(OSSL_STORE_LOADER_CTX *ctx,
990 const OSSL_STORE_SEARCH *search)
991 {
992 /*
993 * If ctx == NULL, the library is looking to know if this loader supports
994 * the given search type.
995 */
996
997 if (OSSL_STORE_SEARCH_get_type(search) == OSSL_STORE_SEARCH_BY_NAME) {
998 unsigned long hash = 0;
999
1000 if (ctx == NULL)
1001 return 1;
1002
1003 if (ctx->type != is_dir) {
1004 OSSL_STOREerr(OSSL_STORE_F_FILE_FIND,
1005 OSSL_STORE_R_SEARCH_ONLY_SUPPORTED_FOR_DIRECTORIES);
1006 return 0;
1007 }
1008
1009 hash = X509_NAME_hash(OSSL_STORE_SEARCH_get0_name(search));
1010 BIO_snprintf(ctx->_.dir.search_name, sizeof(ctx->_.dir.search_name),
1011 "%08lx", hash);
1012 return 1;
1013 }
1014
1015 if (ctx != NULL)
1016 OSSL_STOREerr(OSSL_STORE_F_FILE_FIND,
1017 OSSL_STORE_R_UNSUPPORTED_SEARCH_TYPE);
1018 return 0;
1019 }
1020
1021 static OSSL_STORE_INFO *file_load_try_decode(OSSL_STORE_LOADER_CTX *ctx,
1022 const char *pem_name,
1023 const char *pem_header,
1024 unsigned char *data, size_t len,
1025 const UI_METHOD *ui_method,
1026 void *ui_data, int *matchcount)
1027 {
1028 OSSL_STORE_INFO *result = NULL;
1029 BUF_MEM *new_mem = NULL;
1030 char *new_pem_name = NULL;
1031 int t = 0;
1032
1033 again:
1034 {
1035 size_t i = 0;
1036 void *handler_ctx = NULL;
1037 const FILE_HANDLER **matching_handlers =
1038 OPENSSL_zalloc(sizeof(*matching_handlers)
1039 * OSSL_NELEM(file_handlers));
1040
1041 if (matching_handlers == NULL) {
1042 OSSL_STOREerr(OSSL_STORE_F_FILE_LOAD_TRY_DECODE,
1043 ERR_R_MALLOC_FAILURE);
1044 goto err;
1045 }
1046
1047 *matchcount = 0;
1048 for (i = 0; i < OSSL_NELEM(file_handlers); i++) {
1049 const FILE_HANDLER *handler = file_handlers[i];
1050 int try_matchcount = 0;
1051 void *tmp_handler_ctx = NULL;
1052 OSSL_STORE_INFO *tmp_result =
1053 handler->try_decode(pem_name, pem_header, data, len,
1054 &tmp_handler_ctx, &try_matchcount,
1055 ui_method, ui_data, ctx->libctx, ctx->propq);
1056
1057 if (try_matchcount > 0) {
1058
1059 matching_handlers[*matchcount] = handler;
1060
1061 if (handler_ctx)
1062 handler->destroy_ctx(&handler_ctx);
1063 handler_ctx = tmp_handler_ctx;
1064
1065 if ((*matchcount += try_matchcount) > 1) {
1066 /* more than one match => ambiguous, kill any result */
1067 OSSL_STORE_INFO_free(result);
1068 OSSL_STORE_INFO_free(tmp_result);
1069 if (handler->destroy_ctx != NULL)
1070 handler->destroy_ctx(&handler_ctx);
1071 handler_ctx = NULL;
1072 tmp_result = NULL;
1073 result = NULL;
1074 }
1075 if (result == NULL)
1076 result = tmp_result;
1077 }
1078 }
1079
1080 if (*matchcount == 1 && matching_handlers[0]->repeatable) {
1081 ctx->_.file.last_handler = matching_handlers[0];
1082 ctx->_.file.last_handler_ctx = handler_ctx;
1083 }
1084
1085 OPENSSL_free(matching_handlers);
1086 }
1087
1088 err:
1089 OPENSSL_free(new_pem_name);
1090 BUF_MEM_free(new_mem);
1091
1092 if (result != NULL
1093 && (t = OSSL_STORE_INFO_get_type(result)) == OSSL_STORE_INFO_EMBEDDED) {
1094 pem_name = new_pem_name =
1095 ossl_store_info_get0_EMBEDDED_pem_name(result);
1096 new_mem = ossl_store_info_get0_EMBEDDED_buffer(result);
1097 data = (unsigned char *)new_mem->data;
1098 len = new_mem->length;
1099 OPENSSL_free(result);
1100 result = NULL;
1101 goto again;
1102 }
1103
1104 if (result != NULL)
1105 ERR_clear_error();
1106
1107 return result;
1108 }
1109
1110 static OSSL_STORE_INFO *file_load_try_repeat(OSSL_STORE_LOADER_CTX *ctx,
1111 const UI_METHOD *ui_method,
1112 void *ui_data)
1113 {
1114 OSSL_STORE_INFO *result = NULL;
1115 int try_matchcount = 0;
1116
1117 if (ctx->_.file.last_handler != NULL) {
1118 result =
1119 ctx->_.file.last_handler->try_decode(NULL, NULL, NULL, 0,
1120 &ctx->_.file.last_handler_ctx,
1121 &try_matchcount,
1122 ui_method, ui_data,
1123 ctx->libctx, ctx->propq);
1124
1125 if (result == NULL) {
1126 ctx->_.file.last_handler->destroy_ctx(&ctx->_.file.last_handler_ctx);
1127 ctx->_.file.last_handler_ctx = NULL;
1128 ctx->_.file.last_handler = NULL;
1129 }
1130 }
1131 return result;
1132 }
1133
1134 static void pem_free_flag(void *pem_data, int secure, size_t num)
1135 {
1136 if (secure)
1137 OPENSSL_secure_clear_free(pem_data, num);
1138 else
1139 OPENSSL_free(pem_data);
1140 }
1141 static int file_read_pem(BIO *bp, char **pem_name, char **pem_header,
1142 unsigned char **data, long *len,
1143 const UI_METHOD *ui_method,
1144 void *ui_data, int secure)
1145 {
1146 int i = secure
1147 ? PEM_read_bio_ex(bp, pem_name, pem_header, data, len,
1148 PEM_FLAG_SECURE | PEM_FLAG_EAY_COMPATIBLE)
1149 : PEM_read_bio(bp, pem_name, pem_header, data, len);
1150
1151 if (i <= 0)
1152 return 0;
1153
1154 /*
1155 * 10 is the number of characters in "Proc-Type:", which
1156 * PEM_get_EVP_CIPHER_INFO() requires to be present.
1157 * If the PEM header has less characters than that, it's
1158 * not worth spending cycles on it.
1159 */
1160 if (strlen(*pem_header) > 10) {
1161 EVP_CIPHER_INFO cipher;
1162 struct pem_pass_data pass_data;
1163
1164 if (!PEM_get_EVP_CIPHER_INFO(*pem_header, &cipher)
1165 || !file_fill_pem_pass_data(&pass_data, "PEM", ui_method, ui_data)
1166 || !PEM_do_header(&cipher, *data, len, file_get_pem_pass,
1167 &pass_data)) {
1168 return 0;
1169 }
1170 }
1171 return 1;
1172 }
1173
1174 static int file_read_asn1(BIO *bp, unsigned char **data, long *len)
1175 {
1176 BUF_MEM *mem = NULL;
1177
1178 if (asn1_d2i_read_bio(bp, &mem) < 0)
1179 return 0;
1180
1181 *data = (unsigned char *)mem->data;
1182 *len = (long)mem->length;
1183 OPENSSL_free(mem);
1184
1185 return 1;
1186 }
1187
1188 static int ends_with_dirsep(const char *uri)
1189 {
1190 if (*uri != '\0')
1191 uri += strlen(uri) - 1;
1192 #if defined __VMS
1193 if (*uri == ']' || *uri == '>' || *uri == ':')
1194 return 1;
1195 #elif defined _WIN32
1196 if (*uri == '\\')
1197 return 1;
1198 #endif
1199 return *uri == '/';
1200 }
1201
1202 static int file_name_to_uri(OSSL_STORE_LOADER_CTX *ctx, const char *name,
1203 char **data)
1204 {
1205 assert(name != NULL);
1206 assert(data != NULL);
1207 {
1208 const char *pathsep = ends_with_dirsep(ctx->_.dir.uri) ? "" : "/";
1209 long calculated_length = strlen(ctx->_.dir.uri) + strlen(pathsep)
1210 + strlen(name) + 1 /* \0 */;
1211
1212 *data = OPENSSL_zalloc(calculated_length);
1213 if (*data == NULL) {
1214 OSSL_STOREerr(OSSL_STORE_F_FILE_NAME_TO_URI, ERR_R_MALLOC_FAILURE);
1215 return 0;
1216 }
1217
1218 OPENSSL_strlcat(*data, ctx->_.dir.uri, calculated_length);
1219 OPENSSL_strlcat(*data, pathsep, calculated_length);
1220 OPENSSL_strlcat(*data, name, calculated_length);
1221 }
1222 return 1;
1223 }
1224
1225 static int file_name_check(OSSL_STORE_LOADER_CTX *ctx, const char *name)
1226 {
1227 const char *p = NULL;
1228
1229 /* If there are no search criteria, all names are accepted */
1230 if (ctx->_.dir.search_name[0] == '\0')
1231 return 1;
1232
1233 /* If the expected type isn't supported, no name is accepted */
1234 if (ctx->expected_type != 0
1235 && ctx->expected_type != OSSL_STORE_INFO_CERT
1236 && ctx->expected_type != OSSL_STORE_INFO_CRL)
1237 return 0;
1238
1239 /*
1240 * First, check the basename
1241 */
1242 if (strncasecmp(name, ctx->_.dir.search_name,
1243 sizeof(ctx->_.dir.search_name) - 1) != 0
1244 || name[sizeof(ctx->_.dir.search_name) - 1] != '.')
1245 return 0;
1246 p = &name[sizeof(ctx->_.dir.search_name)];
1247
1248 /*
1249 * Then, if the expected type is a CRL, check that the extension starts
1250 * with 'r'
1251 */
1252 if (*p == 'r') {
1253 p++;
1254 if (ctx->expected_type != 0
1255 && ctx->expected_type != OSSL_STORE_INFO_CRL)
1256 return 0;
1257 } else if (ctx->expected_type == OSSL_STORE_INFO_CRL) {
1258 return 0;
1259 }
1260
1261 /*
1262 * Last, check that the rest of the extension is a decimal number, at
1263 * least one digit long.
1264 */
1265 if (!ossl_isdigit(*p))
1266 return 0;
1267 while (ossl_isdigit(*p))
1268 p++;
1269
1270 # ifdef __VMS
1271 /*
1272 * One extra step here, check for a possible generation number.
1273 */
1274 if (*p == ';')
1275 for (p++; *p != '\0'; p++)
1276 if (!ossl_isdigit(*p))
1277 break;
1278 # endif
1279
1280 /*
1281 * If we've reached the end of the string at this point, we've successfully
1282 * found a fitting file name.
1283 */
1284 return *p == '\0';
1285 }
1286
1287 static int file_eof(OSSL_STORE_LOADER_CTX *ctx);
1288 static int file_error(OSSL_STORE_LOADER_CTX *ctx);
1289 static OSSL_STORE_INFO *file_load(OSSL_STORE_LOADER_CTX *ctx,
1290 const UI_METHOD *ui_method, void *ui_data)
1291 {
1292 OSSL_STORE_INFO *result = NULL;
1293
1294 ctx->errcnt = 0;
1295 ERR_clear_error();
1296
1297 if (ctx->type == is_dir) {
1298 do {
1299 char *newname = NULL;
1300
1301 if (ctx->_.dir.last_entry == NULL) {
1302 if (!ctx->_.dir.end_reached) {
1303 char errbuf[256];
1304 assert(ctx->_.dir.last_errno != 0);
1305 OSSL_STOREerr(OSSL_STORE_F_FILE_LOAD, ERR_R_SYS_LIB);
1306 errno = ctx->_.dir.last_errno;
1307 ctx->errcnt++;
1308 if (openssl_strerror_r(errno, errbuf, sizeof(errbuf)))
1309 ERR_add_error_data(1, errbuf);
1310 }
1311 return NULL;
1312 }
1313
1314 if (ctx->_.dir.last_entry[0] != '.'
1315 && file_name_check(ctx, ctx->_.dir.last_entry)
1316 && !file_name_to_uri(ctx, ctx->_.dir.last_entry, &newname))
1317 return NULL;
1318
1319 /*
1320 * On the first call (with a NULL context), OPENSSL_DIR_read()
1321 * cares about the second argument. On the following calls, it
1322 * only cares that it isn't NULL. Therefore, we can safely give
1323 * it our URI here.
1324 */
1325 ctx->_.dir.last_entry = OPENSSL_DIR_read(&ctx->_.dir.ctx,
1326 ctx->_.dir.uri);
1327 ctx->_.dir.last_errno = errno;
1328 if (ctx->_.dir.last_entry == NULL && ctx->_.dir.last_errno == 0)
1329 ctx->_.dir.end_reached = 1;
1330
1331 if (newname != NULL
1332 && (result = OSSL_STORE_INFO_new_NAME(newname)) == NULL) {
1333 OPENSSL_free(newname);
1334 OSSL_STOREerr(OSSL_STORE_F_FILE_LOAD, ERR_R_OSSL_STORE_LIB);
1335 return NULL;
1336 }
1337 } while (result == NULL && !file_eof(ctx));
1338 } else {
1339 int matchcount = -1;
1340
1341 again:
1342 result = file_load_try_repeat(ctx, ui_method, ui_data);
1343 if (result != NULL)
1344 return result;
1345
1346 if (file_eof(ctx))
1347 return NULL;
1348
1349 do {
1350 char *pem_name = NULL; /* PEM record name */
1351 char *pem_header = NULL; /* PEM record header */
1352 unsigned char *data = NULL; /* DER encoded data */
1353 long len = 0; /* DER encoded data length */
1354
1355 matchcount = -1;
1356 if (ctx->type == is_pem) {
1357 if (!file_read_pem(ctx->_.file.file, &pem_name, &pem_header,
1358 &data, &len, ui_method, ui_data,
1359 (ctx->flags & FILE_FLAG_SECMEM) != 0)) {
1360 ctx->errcnt++;
1361 goto endloop;
1362 }
1363 } else {
1364 if (!file_read_asn1(ctx->_.file.file, &data, &len)) {
1365 ctx->errcnt++;
1366 goto endloop;
1367 }
1368 }
1369
1370 result = file_load_try_decode(ctx, pem_name, pem_header, data, len,
1371 ui_method, ui_data, &matchcount);
1372
1373 if (result != NULL)
1374 goto endloop;
1375
1376 /*
1377 * If a PEM name matches more than one handler, the handlers are
1378 * badly coded.
1379 */
1380 if (!ossl_assert(pem_name == NULL || matchcount <= 1)) {
1381 ctx->errcnt++;
1382 goto endloop;
1383 }
1384
1385 if (matchcount > 1) {
1386 OSSL_STOREerr(OSSL_STORE_F_FILE_LOAD,
1387 OSSL_STORE_R_AMBIGUOUS_CONTENT_TYPE);
1388 } else if (matchcount == 1) {
1389 /*
1390 * If there are other errors on the stack, they already show
1391 * what the problem is.
1392 */
1393 if (ERR_peek_error() == 0) {
1394 OSSL_STOREerr(OSSL_STORE_F_FILE_LOAD,
1395 OSSL_STORE_R_UNSUPPORTED_CONTENT_TYPE);
1396 if (pem_name != NULL)
1397 ERR_add_error_data(3, "PEM type is '", pem_name, "'");
1398 }
1399 }
1400 if (matchcount > 0)
1401 ctx->errcnt++;
1402
1403 endloop:
1404 pem_free_flag(pem_name, (ctx->flags & FILE_FLAG_SECMEM) != 0, 0);
1405 pem_free_flag(pem_header, (ctx->flags & FILE_FLAG_SECMEM) != 0, 0);
1406 pem_free_flag(data, (ctx->flags & FILE_FLAG_SECMEM) != 0, len);
1407 } while (matchcount == 0 && !file_eof(ctx) && !file_error(ctx));
1408
1409 /* We bail out on ambiguity */
1410 if (matchcount > 1)
1411 return NULL;
1412
1413 if (result != NULL
1414 && ctx->expected_type != 0
1415 && ctx->expected_type != OSSL_STORE_INFO_get_type(result)) {
1416 OSSL_STORE_INFO_free(result);
1417 goto again;
1418 }
1419 }
1420
1421 return result;
1422 }
1423
1424 static int file_error(OSSL_STORE_LOADER_CTX *ctx)
1425 {
1426 return ctx->errcnt > 0;
1427 }
1428
1429 static int file_eof(OSSL_STORE_LOADER_CTX *ctx)
1430 {
1431 if (ctx->type == is_dir)
1432 return ctx->_.dir.end_reached;
1433
1434 if (ctx->_.file.last_handler != NULL
1435 && !ctx->_.file.last_handler->eof(ctx->_.file.last_handler_ctx))
1436 return 0;
1437 return BIO_eof(ctx->_.file.file);
1438 }
1439
1440 static int file_close(OSSL_STORE_LOADER_CTX *ctx)
1441 {
1442 if ((ctx->flags & FILE_FLAG_ATTACHED) == 0) {
1443 if (ctx->type == is_dir)
1444 OPENSSL_DIR_end(&ctx->_.dir.ctx);
1445 else
1446 BIO_free_all(ctx->_.file.file);
1447 } else {
1448 /*
1449 * Because file_attach() called file_find_type(), we know that a
1450 * BIO_f_buffer() has been pushed on top of the regular BIO.
1451 */
1452 BIO *buff = ctx->_.file.file;
1453
1454 /* Detach buff */
1455 (void)BIO_pop(ctx->_.file.file);
1456 /* Safety measure */
1457 ctx->_.file.file = NULL;
1458
1459 BIO_free(buff);
1460 }
1461 OSSL_STORE_LOADER_CTX_free(ctx);
1462 return 1;
1463 }
1464
1465 static OSSL_STORE_LOADER file_loader =
1466 {
1467 "file",
1468 NULL,
1469 file_open,
1470 file_attach,
1471 file_ctrl,
1472 file_expect,
1473 file_find,
1474 file_load,
1475 file_eof,
1476 file_error,
1477 file_close
1478 };
1479
1480 static void store_file_loader_deinit(void)
1481 {
1482 ossl_store_unregister_loader_int(file_loader.scheme);
1483 }
1484
1485 int ossl_store_file_loader_init(void)
1486 {
1487 int ret = ossl_store_register_loader_int(&file_loader);
1488
1489 OPENSSL_atexit(store_file_loader_deinit);
1490 return ret;
1491 }
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