2 * Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
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
10 /* This file has quite some overlap with engines/e_loader_attic.c */
12 #include "e_os.h" /* To get strncasecmp() on Windows */
16 #include <ctype.h> /* isdigit */
19 #include <openssl/core_dispatch.h>
20 #include <openssl/core_names.h>
21 #include <openssl/core_object.h>
22 #include <openssl/bio.h>
23 #include <openssl/err.h>
24 #include <openssl/params.h>
25 #include <openssl/decoder.h>
26 #include <openssl/proverr.h>
27 #include <openssl/store.h> /* The OSSL_STORE_INFO type numbers */
28 #include "internal/cryptlib.h"
29 #include "internal/o_dir.h"
30 #include "crypto/decoder.h"
31 #include "crypto/ctype.h" /* ossl_isdigit() */
32 #include "prov/implementations.h"
34 #include "file_store_local.h"
36 DEFINE_STACK_OF(OSSL_STORE_INFO)
43 # define S_ISDIR(a) (((a) & S_IFMT) == S_IFDIR)
46 static OSSL_FUNC_store_open_fn file_open;
47 static OSSL_FUNC_store_attach_fn file_attach;
48 static OSSL_FUNC_store_settable_ctx_params_fn file_settable_ctx_params;
49 static OSSL_FUNC_store_set_ctx_params_fn file_set_ctx_params;
50 static OSSL_FUNC_store_load_fn file_load;
51 static OSSL_FUNC_store_eof_fn file_eof;
52 static OSSL_FUNC_store_close_fn file_close;
55 * This implementation makes full use of OSSL_DECODER, and then some.
56 * It uses its own internal decoder implementation that reads DER and
57 * passes that on to the data callback; this decoder is created with
58 * internal OpenSSL functions, thereby bypassing the need for a surrounding
59 * provider. This is ok, since this is a local decoder, not meant for
60 * public consumption. It also uses the libcrypto internal decoder
61 * setup function ossl_decoder_ctx_setup_for_pkey(), to allow the
62 * last resort decoder to be added first (and thereby be executed last).
63 * Finally, it sets up its own construct and cleanup functions.
65 * Essentially, that makes this implementation a kind of glorified decoder.
70 char *uri; /* The URI we currently try to load */
72 IS_FILE = 0, /* Read file and pass results */
73 IS_DIR /* Pass directory entry names */
77 /* Used with |IS_FILE| */
81 OSSL_DECODER_CTX *decoderctx;
83 char *propq; /* The properties we got as a parameter */
86 /* Used with |IS_DIR| */
92 * When a search expression is given, these are filled in.
93 * |search_name| contains the file basename to look for.
94 * The string is exactly 8 characters long.
99 * The directory reading utility we have combines opening with
100 * reading the first name. To make sure we can detect the end
101 * at the right time, we read early and cache the name.
103 const char *last_entry;
108 /* Expected object type. May be unspecified */
112 static void free_file_ctx(struct file_ctx_st *ctx)
117 OPENSSL_free(ctx->uri);
118 if (ctx->type != IS_DIR) {
119 OSSL_DECODER_CTX_free(ctx->_.file.decoderctx);
120 OPENSSL_free(ctx->_.file.propq);
121 OPENSSL_free(ctx->_.file.input_type);
126 static struct file_ctx_st *new_file_ctx(int type, const char *uri,
129 struct file_ctx_st *ctx = NULL;
131 if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) != NULL
132 && (uri == NULL || (ctx->uri = OPENSSL_strdup(uri)) != NULL)) {
134 ctx->provctx = provctx;
141 static OSSL_DECODER_CONSTRUCT file_load_construct;
142 static OSSL_DECODER_CLEANUP file_load_cleanup;
145 * Opening / attaching streams and directories
146 * -------------------------------------------
150 * Function to service both file_open() and file_attach()
154 static struct file_ctx_st *file_open_stream(BIO *source, const char *uri,
157 struct file_ctx_st *ctx;
159 if ((ctx = new_file_ctx(IS_FILE, uri, provctx)) == NULL) {
160 ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
164 ctx->_.file.file = source;
172 static void *file_open_dir(const char *path, const char *uri, void *provctx)
174 struct file_ctx_st *ctx;
176 if ((ctx = new_file_ctx(IS_DIR, uri, provctx)) == NULL) {
177 ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
181 ctx->_.dir.last_entry = OPENSSL_DIR_read(&ctx->_.dir.ctx, path);
182 ctx->_.dir.last_errno = errno;
183 if (ctx->_.dir.last_entry == NULL) {
184 if (ctx->_.dir.last_errno != 0) {
185 ERR_raise_data(ERR_LIB_SYS, ctx->_.dir.last_errno,
186 "Calling OPENSSL_DIR_read(\"%s\")", path);
189 ctx->_.dir.end_reached = 1;
197 static void *file_open(void *provctx, const char *uri)
199 struct file_ctx_st *ctx = NULL;
203 unsigned int check_absolute:1;
205 size_t path_data_n = 0, i;
206 const char *path, *p = uri, *q;
212 * First step, just take the URI as is.
214 path_data[path_data_n].check_absolute = 0;
215 path_data[path_data_n++].path = uri;
218 * Second step, if the URI appears to start with the "file" scheme,
219 * extract the path and make that the second path to check.
220 * There's a special case if the URI also contains an authority, then
221 * the full URI shouldn't be used as a path anywhere.
223 if (CHECK_AND_SKIP_CASE_PREFIX(p, "file:")) {
225 if (CHECK_AND_SKIP_CASE_PREFIX(q, "//")) {
226 path_data_n--; /* Invalidate using the full URI */
227 if (CHECK_AND_SKIP_CASE_PREFIX(q, "localhost/")
228 || CHECK_AND_SKIP_CASE_PREFIX(q, "/")) {
231 ERR_clear_last_mark();
232 ERR_raise(ERR_LIB_PROV, PROV_R_URI_AUTHORITY_UNSUPPORTED);
237 path_data[path_data_n].check_absolute = 1;
239 /* Windows "file:" URIs with a drive letter start with a '/' */
240 if (p[0] == '/' && p[2] == ':' && p[3] == '/') {
241 char c = tolower(p[1]);
243 if (c >= 'a' && c <= 'z') {
245 /* We know it's absolute, so no need to check */
246 path_data[path_data_n].check_absolute = 0;
250 path_data[path_data_n++].path = p;
254 for (i = 0, path = NULL; path == NULL && i < path_data_n; i++) {
256 * If the scheme "file" was an explicit part of the URI, the path must
257 * be absolute. So says RFC 8089
259 if (path_data[i].check_absolute && path_data[i].path[0] != '/') {
260 ERR_clear_last_mark();
261 ERR_raise_data(ERR_LIB_PROV, PROV_R_PATH_MUST_BE_ABSOLUTE,
262 "Given path=%s", path_data[i].path);
266 if (stat(path_data[i].path, &st) < 0) {
267 ERR_raise_data(ERR_LIB_SYS, errno,
271 path = path_data[i].path;
275 ERR_clear_last_mark();
279 /* Successfully found a working path, clear possible collected errors */
282 if (S_ISDIR(st.st_mode))
283 ctx = file_open_dir(path, uri, provctx);
284 else if ((bio = BIO_new_file(path, "rb")) == NULL
285 || (ctx = file_open_stream(bio, uri, provctx)) == NULL)
291 void *file_attach(void *provctx, OSSL_CORE_BIO *cin)
293 struct file_ctx_st *ctx;
294 BIO *new_bio = ossl_bio_new_from_core_bio(provctx, cin);
299 ctx = file_open_stream(new_bio, NULL, provctx);
310 static const OSSL_PARAM *file_settable_ctx_params(void *provctx)
312 static const OSSL_PARAM known_settable_ctx_params[] = {
313 OSSL_PARAM_utf8_string(OSSL_STORE_PARAM_PROPERTIES, NULL, 0),
314 OSSL_PARAM_int(OSSL_STORE_PARAM_EXPECT, NULL),
315 OSSL_PARAM_octet_string(OSSL_STORE_PARAM_SUBJECT, NULL, 0),
316 OSSL_PARAM_utf8_string(OSSL_STORE_PARAM_INPUT_TYPE, NULL, 0),
319 return known_settable_ctx_params;
322 static int file_set_ctx_params(void *loaderctx, const OSSL_PARAM params[])
324 struct file_ctx_st *ctx = loaderctx;
330 if (ctx->type != IS_DIR) {
331 /* these parameters are ignored for directories */
332 p = OSSL_PARAM_locate_const(params, OSSL_STORE_PARAM_PROPERTIES);
334 OPENSSL_free(ctx->_.file.propq);
335 ctx->_.file.propq = NULL;
336 if (!OSSL_PARAM_get_utf8_string(p, &ctx->_.file.propq, 0))
339 p = OSSL_PARAM_locate_const(params, OSSL_STORE_PARAM_INPUT_TYPE);
341 OPENSSL_free(ctx->_.file.input_type);
342 ctx->_.file.input_type = NULL;
343 if (!OSSL_PARAM_get_utf8_string(p, &ctx->_.file.input_type, 0))
347 p = OSSL_PARAM_locate_const(params, OSSL_STORE_PARAM_EXPECT);
348 if (p != NULL && !OSSL_PARAM_get_int(p, &ctx->expected_type))
350 p = OSSL_PARAM_locate_const(params, OSSL_STORE_PARAM_SUBJECT);
352 const unsigned char *der = NULL;
354 X509_NAME *x509_name;
358 if (ctx->type != IS_DIR) {
359 ERR_raise(ERR_LIB_PROV,
360 PROV_R_SEARCH_ONLY_SUPPORTED_FOR_DIRECTORIES);
364 if (!OSSL_PARAM_get_octet_string_ptr(p, (const void **)&der, &der_len)
365 || (x509_name = d2i_X509_NAME(NULL, &der, der_len)) == NULL)
367 hash = X509_NAME_hash_ex(x509_name,
368 ossl_prov_ctx_get0_libctx(ctx->provctx), NULL,
370 BIO_snprintf(ctx->_.dir.search_name, sizeof(ctx->_.dir.search_name),
372 X509_NAME_free(x509_name);
380 * Loading an object from a stream
381 * -------------------------------
384 struct file_load_data_st {
385 OSSL_CALLBACK *object_cb;
389 static int file_load_construct(OSSL_DECODER_INSTANCE *decoder_inst,
390 const OSSL_PARAM *params, void *construct_data)
392 struct file_load_data_st *data = construct_data;
395 * At some point, we may find it justifiable to recognise PKCS#12 and
396 * handle it specially here, making |file_load()| return pass its
397 * contents one piece at ta time, like |e_loader_attic.c| does.
399 * However, that currently means parsing them out, which converts the
400 * DER encoded PKCS#12 into a bunch of EVP_PKEYs and X509s, just to
401 * have to re-encode them into DER to create an object abstraction for
403 * It's much simpler (less churn) to pass on the object abstraction we
404 * get to the load_result callback and leave it to that one to do the
405 * work. If that's libcrypto code, we know that it has much better
406 * possibilities to handle the EVP_PKEYs and X509s without the extra
410 return data->object_cb(params, data->object_cbarg);
413 void file_load_cleanup(void *construct_data)
418 static int file_setup_decoders(struct file_ctx_st *ctx)
420 OSSL_LIB_CTX *libctx = ossl_prov_ctx_get0_libctx(ctx->provctx);
421 const OSSL_ALGORITHM *to_algo = NULL;
424 /* Setup for this session, so only if not already done */
425 if (ctx->_.file.decoderctx == NULL) {
426 if ((ctx->_.file.decoderctx = OSSL_DECODER_CTX_new()) == NULL) {
427 ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
431 /* Make sure the input type is set */
432 if (!OSSL_DECODER_CTX_set_input_type(ctx->_.file.decoderctx,
433 ctx->_.file.input_type)) {
434 ERR_raise(ERR_LIB_PROV, ERR_R_OSSL_DECODER_LIB);
439 * Where applicable, set the outermost structure name.
440 * The goal is to avoid the STORE object types that are
441 * potentially password protected but aren't interesting
444 switch (ctx->expected_type) {
445 case OSSL_STORE_INFO_CERT:
446 if (!OSSL_DECODER_CTX_set_input_structure(ctx->_.file.decoderctx,
448 ERR_raise(ERR_LIB_PROV, ERR_R_OSSL_DECODER_LIB);
452 case OSSL_STORE_INFO_CRL:
453 if (!OSSL_DECODER_CTX_set_input_structure(ctx->_.file.decoderctx,
454 "CertificateList")) {
455 ERR_raise(ERR_LIB_PROV, ERR_R_OSSL_DECODER_LIB);
463 for (to_algo = ossl_any_to_obj_algorithm;
464 to_algo->algorithm_names != NULL;
466 OSSL_DECODER *to_obj = NULL;
467 OSSL_DECODER_INSTANCE *to_obj_inst = NULL;
470 * Create the internal last resort decoder implementation
471 * together with a "decoder instance".
472 * The decoder doesn't need any identification or to be
473 * attached to any provider, since it's only used locally.
475 to_obj = ossl_decoder_from_algorithm(0, to_algo, NULL);
477 to_obj_inst = ossl_decoder_instance_new(to_obj, ctx->provctx);
478 OSSL_DECODER_free(to_obj);
479 if (to_obj_inst == NULL)
482 if (!ossl_decoder_ctx_add_decoder_inst(ctx->_.file.decoderctx,
484 ossl_decoder_instance_free(to_obj_inst);
485 ERR_raise(ERR_LIB_PROV, ERR_R_OSSL_DECODER_LIB);
489 /* Add on the usual extra decoders */
490 if (!OSSL_DECODER_CTX_add_extra(ctx->_.file.decoderctx,
491 libctx, ctx->_.file.propq)) {
492 ERR_raise(ERR_LIB_PROV, ERR_R_OSSL_DECODER_LIB);
497 * Then install our constructor hooks, which just passes decoded
498 * data to the load callback
500 if (!OSSL_DECODER_CTX_set_construct(ctx->_.file.decoderctx,
502 || !OSSL_DECODER_CTX_set_cleanup(ctx->_.file.decoderctx,
503 file_load_cleanup)) {
504 ERR_raise(ERR_LIB_PROV, ERR_R_OSSL_DECODER_LIB);
514 static int file_load_file(struct file_ctx_st *ctx,
515 OSSL_CALLBACK *object_cb, void *object_cbarg,
516 OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
518 struct file_load_data_st data;
521 /* Setup the decoders (one time shot per session */
523 if (!file_setup_decoders(ctx))
526 /* Setup for this object */
528 data.object_cb = object_cb;
529 data.object_cbarg = object_cbarg;
530 OSSL_DECODER_CTX_set_construct_data(ctx->_.file.decoderctx, &data);
531 OSSL_DECODER_CTX_set_passphrase_cb(ctx->_.file.decoderctx, pw_cb, pw_cbarg);
536 ret = OSSL_DECODER_from_bio(ctx->_.file.decoderctx, ctx->_.file.file);
537 if (BIO_eof(ctx->_.file.file)
538 && ((err = ERR_peek_last_error()) != 0)
539 && ERR_GET_LIB(err) == ERR_LIB_OSSL_DECODER
540 && ERR_GET_REASON(err) == ERR_R_UNSUPPORTED)
543 ERR_clear_last_mark();
548 * Loading a name object from a directory
549 * --------------------------------------
552 static char *file_name_to_uri(struct file_ctx_st *ctx, const char *name)
556 assert(name != NULL);
558 const char *pathsep = ossl_ends_with_dirsep(ctx->uri) ? "" : "/";
559 long calculated_length = strlen(ctx->uri) + strlen(pathsep)
560 + strlen(name) + 1 /* \0 */;
562 data = OPENSSL_zalloc(calculated_length);
564 ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
568 OPENSSL_strlcat(data, ctx->uri, calculated_length);
569 OPENSSL_strlcat(data, pathsep, calculated_length);
570 OPENSSL_strlcat(data, name, calculated_length);
575 static int file_name_check(struct file_ctx_st *ctx, const char *name)
577 const char *p = NULL;
578 size_t len = strlen(ctx->_.dir.search_name);
580 /* If there are no search criteria, all names are accepted */
581 if (ctx->_.dir.search_name[0] == '\0')
584 /* If the expected type isn't supported, no name is accepted */
585 if (ctx->expected_type != 0
586 && ctx->expected_type != OSSL_STORE_INFO_CERT
587 && ctx->expected_type != OSSL_STORE_INFO_CRL)
591 * First, check the basename
593 if (strncasecmp(name, ctx->_.dir.search_name, len) != 0 || name[len] != '.')
598 * Then, if the expected type is a CRL, check that the extension starts
603 if (ctx->expected_type != 0
604 && ctx->expected_type != OSSL_STORE_INFO_CRL)
606 } else if (ctx->expected_type == OSSL_STORE_INFO_CRL) {
611 * Last, check that the rest of the extension is a decimal number, at
612 * least one digit long.
621 * One extra step here, check for a possible generation number.
624 for (p++; *p != '\0'; p++)
625 if (!ossl_isdigit(*p))
630 * If we've reached the end of the string at this point, we've successfully
631 * found a fitting file name.
636 static int file_load_dir_entry(struct file_ctx_st *ctx,
637 OSSL_CALLBACK *object_cb, void *object_cbarg,
638 OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
640 /* Prepare as much as possible in advance */
641 static const int object_type = OSSL_OBJECT_NAME;
642 OSSL_PARAM object[] = {
643 OSSL_PARAM_int(OSSL_OBJECT_PARAM_TYPE, (int *)&object_type),
644 OSSL_PARAM_utf8_string(OSSL_OBJECT_PARAM_DATA, NULL, 0),
647 char *newname = NULL;
650 /* Loop until we get an error or until we have a suitable name */
652 if (ctx->_.dir.last_entry == NULL) {
653 if (!ctx->_.dir.end_reached) {
654 assert(ctx->_.dir.last_errno != 0);
655 ERR_raise(ERR_LIB_SYS, ctx->_.dir.last_errno);
657 /* file_eof() will tell if EOF was reached */
661 /* flag acceptable names */
662 if (ctx->_.dir.last_entry[0] != '.'
663 && file_name_check(ctx, ctx->_.dir.last_entry)) {
665 /* If we can't allocate the new name, we fail */
667 file_name_to_uri(ctx, ctx->_.dir.last_entry)) == NULL)
672 * On the first call (with a NULL context), OPENSSL_DIR_read()
673 * cares about the second argument. On the following calls, it
674 * only cares that it isn't NULL. Therefore, we can safely give
677 ctx->_.dir.last_entry = OPENSSL_DIR_read(&ctx->_.dir.ctx, ctx->uri);
678 ctx->_.dir.last_errno = errno;
679 if (ctx->_.dir.last_entry == NULL && ctx->_.dir.last_errno == 0)
680 ctx->_.dir.end_reached = 1;
681 } while (newname == NULL);
683 object[1].data = newname;
684 object[1].data_size = strlen(newname);
685 ok = object_cb(object, object_cbarg);
686 OPENSSL_free(newname);
691 * Loading, local dispatcher
692 * -------------------------
695 static int file_load(void *loaderctx,
696 OSSL_CALLBACK *object_cb, void *object_cbarg,
697 OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
699 struct file_ctx_st *ctx = loaderctx;
703 return file_load_file(ctx, object_cb, object_cbarg, pw_cb, pw_cbarg);
706 file_load_dir_entry(ctx, object_cb, object_cbarg, pw_cb, pw_cbarg);
711 /* ctx->type has an unexpected value */
717 * Eof detection and closing
718 * -------------------------
721 static int file_eof(void *loaderctx)
723 struct file_ctx_st *ctx = loaderctx;
727 return ctx->_.dir.end_reached;
730 * BIO_pending() checks any filter BIO.
731 * BIO_eof() checks the source BIO.
733 return !BIO_pending(ctx->_.file.file)
734 && BIO_eof(ctx->_.file.file);
737 /* ctx->type has an unexpected value */
742 static int file_close_dir(struct file_ctx_st *ctx)
744 if (ctx->_.dir.ctx != NULL)
745 OPENSSL_DIR_end(&ctx->_.dir.ctx);
750 static int file_close_stream(struct file_ctx_st *ctx)
753 * This frees either the provider BIO filter (for file_attach()) OR
754 * the allocated file BIO (for file_open()).
756 BIO_free(ctx->_.file.file);
757 ctx->_.file.file = NULL;
763 static int file_close(void *loaderctx)
765 struct file_ctx_st *ctx = loaderctx;
769 return file_close_dir(ctx);
771 return file_close_stream(ctx);
774 /* ctx->type has an unexpected value */
779 const OSSL_DISPATCH ossl_file_store_functions[] = {
780 { OSSL_FUNC_STORE_OPEN, (void (*)(void))file_open },
781 { OSSL_FUNC_STORE_ATTACH, (void (*)(void))file_attach },
782 { OSSL_FUNC_STORE_SETTABLE_CTX_PARAMS,
783 (void (*)(void))file_settable_ctx_params },
784 { OSSL_FUNC_STORE_SET_CTX_PARAMS, (void (*)(void))file_set_ctx_params },
785 { OSSL_FUNC_STORE_LOAD, (void (*)(void))file_load },
786 { OSSL_FUNC_STORE_EOF, (void (*)(void))file_eof },
787 { OSSL_FUNC_STORE_CLOSE, (void (*)(void))file_close },