2 * Copyright 2020-2023 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 */
14 #include <ctype.h> /* isdigit */
17 #include <openssl/core_dispatch.h>
18 #include <openssl/core_names.h>
19 #include <openssl/core_object.h>
20 #include <openssl/bio.h>
21 #include <openssl/err.h>
22 #include <openssl/params.h>
23 #include <openssl/decoder.h>
24 #include <openssl/proverr.h>
25 #include <openssl/store.h> /* The OSSL_STORE_INFO type numbers */
26 #include "internal/cryptlib.h"
27 #include "internal/o_dir.h"
28 #include "crypto/decoder.h"
29 #include "crypto/ctype.h" /* ossl_isdigit() */
30 #include "prov/implementations.h"
32 #include "file_store_local.h"
34 DEFINE_STACK_OF(OSSL_STORE_INFO)
41 # define S_ISDIR(a) (((a) & S_IFMT) == S_IFDIR)
44 static OSSL_FUNC_store_open_fn file_open;
45 static OSSL_FUNC_store_attach_fn file_attach;
46 static OSSL_FUNC_store_settable_ctx_params_fn file_settable_ctx_params;
47 static OSSL_FUNC_store_set_ctx_params_fn file_set_ctx_params;
48 static OSSL_FUNC_store_load_fn file_load;
49 static OSSL_FUNC_store_eof_fn file_eof;
50 static OSSL_FUNC_store_close_fn file_close;
53 * This implementation makes full use of OSSL_DECODER, and then some.
54 * It uses its own internal decoder implementation that reads DER and
55 * passes that on to the data callback; this decoder is created with
56 * internal OpenSSL functions, thereby bypassing the need for a surrounding
57 * provider. This is ok, since this is a local decoder, not meant for
59 * Finally, it sets up its own construct and cleanup functions.
61 * Essentially, that makes this implementation a kind of glorified decoder.
66 char *uri; /* The URI we currently try to load */
68 IS_FILE = 0, /* Read file and pass results */
69 IS_DIR /* Pass directory entry names */
73 /* Used with |IS_FILE| */
77 OSSL_DECODER_CTX *decoderctx;
79 char *propq; /* The properties we got as a parameter */
82 /* Used with |IS_DIR| */
88 * When a search expression is given, these are filled in.
89 * |search_name| contains the file basename to look for.
90 * The string is exactly 8 characters long.
95 * The directory reading utility we have combines opening with
96 * reading the first name. To make sure we can detect the end
97 * at the right time, we read early and cache the name.
99 const char *last_entry;
104 /* Expected object type. May be unspecified */
108 static void free_file_ctx(struct file_ctx_st *ctx)
113 OPENSSL_free(ctx->uri);
114 if (ctx->type != IS_DIR) {
115 OSSL_DECODER_CTX_free(ctx->_.file.decoderctx);
116 OPENSSL_free(ctx->_.file.propq);
117 OPENSSL_free(ctx->_.file.input_type);
122 static struct file_ctx_st *new_file_ctx(int type, const char *uri,
125 struct file_ctx_st *ctx = NULL;
127 if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) != NULL
128 && (uri == NULL || (ctx->uri = OPENSSL_strdup(uri)) != NULL)) {
130 ctx->provctx = provctx;
137 static OSSL_DECODER_CONSTRUCT file_load_construct;
138 static OSSL_DECODER_CLEANUP file_load_cleanup;
141 * Opening / attaching streams and directories
142 * -------------------------------------------
146 * Function to service both file_open() and file_attach()
150 static struct file_ctx_st *file_open_stream(BIO *source, const char *uri,
153 struct file_ctx_st *ctx;
155 if ((ctx = new_file_ctx(IS_FILE, uri, provctx)) == NULL) {
156 ERR_raise(ERR_LIB_PROV, ERR_R_PROV_LIB);
160 ctx->_.file.file = source;
168 static void *file_open_dir(const char *path, const char *uri, void *provctx)
170 struct file_ctx_st *ctx;
172 if ((ctx = new_file_ctx(IS_DIR, uri, provctx)) == NULL) {
173 ERR_raise(ERR_LIB_PROV, ERR_R_PROV_LIB);
177 ctx->_.dir.last_entry = OPENSSL_DIR_read(&ctx->_.dir.ctx, path);
178 ctx->_.dir.last_errno = errno;
179 if (ctx->_.dir.last_entry == NULL) {
180 if (ctx->_.dir.last_errno != 0) {
181 ERR_raise_data(ERR_LIB_SYS, ctx->_.dir.last_errno,
182 "Calling OPENSSL_DIR_read(\"%s\")", path);
185 ctx->_.dir.end_reached = 1;
193 static void *file_open(void *provctx, const char *uri)
195 struct file_ctx_st *ctx = NULL;
199 unsigned int check_absolute:1;
201 size_t path_data_n = 0, i;
202 const char *path, *p = uri, *q;
208 * First step, just take the URI as is.
210 path_data[path_data_n].check_absolute = 0;
211 path_data[path_data_n++].path = uri;
214 * Second step, if the URI appears to start with the "file" scheme,
215 * extract the path and make that the second path to check.
216 * There's a special case if the URI also contains an authority, then
217 * the full URI shouldn't be used as a path anywhere.
219 if (CHECK_AND_SKIP_CASE_PREFIX(p, "file:")) {
221 if (CHECK_AND_SKIP_CASE_PREFIX(q, "//")) {
222 path_data_n--; /* Invalidate using the full URI */
223 if (CHECK_AND_SKIP_CASE_PREFIX(q, "localhost/")
224 || CHECK_AND_SKIP_CASE_PREFIX(q, "/")) {
227 ERR_clear_last_mark();
228 ERR_raise(ERR_LIB_PROV, PROV_R_URI_AUTHORITY_UNSUPPORTED);
233 path_data[path_data_n].check_absolute = 1;
235 /* Windows "file:" URIs with a drive letter start with a '/' */
236 if (p[0] == '/' && p[2] == ':' && p[3] == '/') {
237 char c = tolower(p[1]);
239 if (c >= 'a' && c <= 'z') {
241 /* We know it's absolute, so no need to check */
242 path_data[path_data_n].check_absolute = 0;
246 path_data[path_data_n++].path = p;
250 for (i = 0, path = NULL; path == NULL && i < path_data_n; i++) {
252 * If the scheme "file" was an explicit part of the URI, the path must
253 * be absolute. So says RFC 8089
255 if (path_data[i].check_absolute && path_data[i].path[0] != '/') {
256 ERR_clear_last_mark();
257 ERR_raise_data(ERR_LIB_PROV, PROV_R_PATH_MUST_BE_ABSOLUTE,
258 "Given path=%s", path_data[i].path);
262 if (stat(path_data[i].path, &st) < 0) {
263 ERR_raise_data(ERR_LIB_SYS, errno,
267 path = path_data[i].path;
271 ERR_clear_last_mark();
275 /* Successfully found a working path, clear possible collected errors */
278 if (S_ISDIR(st.st_mode))
279 ctx = file_open_dir(path, uri, provctx);
280 else if ((bio = BIO_new_file(path, "rb")) == NULL
281 || (ctx = file_open_stream(bio, uri, provctx)) == NULL)
287 void *file_attach(void *provctx, OSSL_CORE_BIO *cin)
289 struct file_ctx_st *ctx;
290 BIO *new_bio = ossl_bio_new_from_core_bio(provctx, cin);
295 ctx = file_open_stream(new_bio, NULL, provctx);
306 static const OSSL_PARAM *file_settable_ctx_params(void *provctx)
308 static const OSSL_PARAM known_settable_ctx_params[] = {
309 OSSL_PARAM_utf8_string(OSSL_STORE_PARAM_PROPERTIES, NULL, 0),
310 OSSL_PARAM_int(OSSL_STORE_PARAM_EXPECT, NULL),
311 OSSL_PARAM_octet_string(OSSL_STORE_PARAM_SUBJECT, NULL, 0),
312 OSSL_PARAM_utf8_string(OSSL_STORE_PARAM_INPUT_TYPE, NULL, 0),
315 return known_settable_ctx_params;
318 static int file_set_ctx_params(void *loaderctx, const OSSL_PARAM params[])
320 struct file_ctx_st *ctx = loaderctx;
326 if (ctx->type != IS_DIR) {
327 /* these parameters are ignored for directories */
328 p = OSSL_PARAM_locate_const(params, OSSL_STORE_PARAM_PROPERTIES);
330 OPENSSL_free(ctx->_.file.propq);
331 ctx->_.file.propq = NULL;
332 if (!OSSL_PARAM_get_utf8_string(p, &ctx->_.file.propq, 0))
335 p = OSSL_PARAM_locate_const(params, OSSL_STORE_PARAM_INPUT_TYPE);
337 OPENSSL_free(ctx->_.file.input_type);
338 ctx->_.file.input_type = NULL;
339 if (!OSSL_PARAM_get_utf8_string(p, &ctx->_.file.input_type, 0))
343 p = OSSL_PARAM_locate_const(params, OSSL_STORE_PARAM_EXPECT);
344 if (p != NULL && !OSSL_PARAM_get_int(p, &ctx->expected_type))
346 p = OSSL_PARAM_locate_const(params, OSSL_STORE_PARAM_SUBJECT);
348 const unsigned char *der = NULL;
350 X509_NAME *x509_name;
354 if (ctx->type != IS_DIR) {
355 ERR_raise(ERR_LIB_PROV,
356 PROV_R_SEARCH_ONLY_SUPPORTED_FOR_DIRECTORIES);
360 if (!OSSL_PARAM_get_octet_string_ptr(p, (const void **)&der, &der_len)
361 || (x509_name = d2i_X509_NAME(NULL, &der, der_len)) == NULL)
363 hash = X509_NAME_hash_ex(x509_name,
364 ossl_prov_ctx_get0_libctx(ctx->provctx), NULL,
366 BIO_snprintf(ctx->_.dir.search_name, sizeof(ctx->_.dir.search_name),
368 X509_NAME_free(x509_name);
376 * Loading an object from a stream
377 * -------------------------------
380 struct file_load_data_st {
381 OSSL_CALLBACK *object_cb;
385 static int file_load_construct(OSSL_DECODER_INSTANCE *decoder_inst,
386 const OSSL_PARAM *params, void *construct_data)
388 struct file_load_data_st *data = construct_data;
391 * At some point, we may find it justifiable to recognise PKCS#12 and
392 * handle it specially here, making |file_load()| return pass its
393 * contents one piece at ta time, like |e_loader_attic.c| does.
395 * However, that currently means parsing them out, which converts the
396 * DER encoded PKCS#12 into a bunch of EVP_PKEYs and X509s, just to
397 * have to re-encode them into DER to create an object abstraction for
399 * It's much simpler (less churn) to pass on the object abstraction we
400 * get to the load_result callback and leave it to that one to do the
401 * work. If that's libcrypto code, we know that it has much better
402 * possibilities to handle the EVP_PKEYs and X509s without the extra
406 return data->object_cb(params, data->object_cbarg);
409 void file_load_cleanup(void *construct_data)
414 static int file_setup_decoders(struct file_ctx_st *ctx)
416 OSSL_LIB_CTX *libctx = ossl_prov_ctx_get0_libctx(ctx->provctx);
417 const OSSL_ALGORITHM *to_algo = NULL;
420 /* Setup for this session, so only if not already done */
421 if (ctx->_.file.decoderctx == NULL) {
422 if ((ctx->_.file.decoderctx = OSSL_DECODER_CTX_new()) == NULL) {
423 ERR_raise(ERR_LIB_PROV, ERR_R_OSSL_DECODER_LIB);
427 /* Make sure the input type is set */
428 if (!OSSL_DECODER_CTX_set_input_type(ctx->_.file.decoderctx,
429 ctx->_.file.input_type)) {
430 ERR_raise(ERR_LIB_PROV, ERR_R_OSSL_DECODER_LIB);
435 * Where applicable, set the outermost structure name.
436 * The goal is to avoid the STORE object types that are
437 * potentially password protected but aren't interesting
440 switch (ctx->expected_type) {
441 case OSSL_STORE_INFO_CERT:
442 if (!OSSL_DECODER_CTX_set_input_structure(ctx->_.file.decoderctx,
444 ERR_raise(ERR_LIB_PROV, ERR_R_OSSL_DECODER_LIB);
448 case OSSL_STORE_INFO_CRL:
449 if (!OSSL_DECODER_CTX_set_input_structure(ctx->_.file.decoderctx,
450 "CertificateList")) {
451 ERR_raise(ERR_LIB_PROV, ERR_R_OSSL_DECODER_LIB);
459 for (to_algo = ossl_any_to_obj_algorithm;
460 to_algo->algorithm_names != NULL;
462 OSSL_DECODER *to_obj = NULL;
463 OSSL_DECODER_INSTANCE *to_obj_inst = NULL;
466 * Create the internal last resort decoder implementation
467 * together with a "decoder instance".
468 * The decoder doesn't need any identification or to be
469 * attached to any provider, since it's only used locally.
471 to_obj = ossl_decoder_from_algorithm(0, to_algo, NULL);
473 to_obj_inst = ossl_decoder_instance_new(to_obj, ctx->provctx);
474 OSSL_DECODER_free(to_obj);
475 if (to_obj_inst == NULL)
478 if (!ossl_decoder_ctx_add_decoder_inst(ctx->_.file.decoderctx,
480 ossl_decoder_instance_free(to_obj_inst);
481 ERR_raise(ERR_LIB_PROV, ERR_R_OSSL_DECODER_LIB);
485 /* Add on the usual extra decoders */
486 if (!OSSL_DECODER_CTX_add_extra(ctx->_.file.decoderctx,
487 libctx, ctx->_.file.propq)) {
488 ERR_raise(ERR_LIB_PROV, ERR_R_OSSL_DECODER_LIB);
493 * Then install our constructor hooks, which just passes decoded
494 * data to the load callback
496 if (!OSSL_DECODER_CTX_set_construct(ctx->_.file.decoderctx,
498 || !OSSL_DECODER_CTX_set_cleanup(ctx->_.file.decoderctx,
499 file_load_cleanup)) {
500 ERR_raise(ERR_LIB_PROV, ERR_R_OSSL_DECODER_LIB);
510 static int file_load_file(struct file_ctx_st *ctx,
511 OSSL_CALLBACK *object_cb, void *object_cbarg,
512 OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
514 struct file_load_data_st data;
517 /* Setup the decoders (one time shot per session */
519 if (!file_setup_decoders(ctx))
522 /* Setup for this object */
524 data.object_cb = object_cb;
525 data.object_cbarg = object_cbarg;
526 OSSL_DECODER_CTX_set_construct_data(ctx->_.file.decoderctx, &data);
527 OSSL_DECODER_CTX_set_passphrase_cb(ctx->_.file.decoderctx, pw_cb, pw_cbarg);
532 ret = OSSL_DECODER_from_bio(ctx->_.file.decoderctx, ctx->_.file.file);
533 if (BIO_eof(ctx->_.file.file)
534 && ((err = ERR_peek_last_error()) != 0)
535 && ERR_GET_LIB(err) == ERR_LIB_OSSL_DECODER
536 && ERR_GET_REASON(err) == ERR_R_UNSUPPORTED)
539 ERR_clear_last_mark();
544 * Loading a name object from a directory
545 * --------------------------------------
548 static char *file_name_to_uri(struct file_ctx_st *ctx, const char *name)
552 assert(name != NULL);
554 const char *pathsep = ossl_ends_with_dirsep(ctx->uri) ? "" : "/";
555 long calculated_length = strlen(ctx->uri) + strlen(pathsep)
556 + strlen(name) + 1 /* \0 */;
558 data = OPENSSL_zalloc(calculated_length);
562 OPENSSL_strlcat(data, ctx->uri, calculated_length);
563 OPENSSL_strlcat(data, pathsep, calculated_length);
564 OPENSSL_strlcat(data, name, calculated_length);
569 static int file_name_check(struct file_ctx_st *ctx, const char *name)
571 const char *p = NULL;
572 size_t len = strlen(ctx->_.dir.search_name);
574 /* If there are no search criteria, all names are accepted */
575 if (ctx->_.dir.search_name[0] == '\0')
578 /* If the expected type isn't supported, no name is accepted */
579 if (ctx->expected_type != 0
580 && ctx->expected_type != OSSL_STORE_INFO_CERT
581 && ctx->expected_type != OSSL_STORE_INFO_CRL)
585 * First, check the basename
587 if (OPENSSL_strncasecmp(name, ctx->_.dir.search_name, len) != 0
593 * Then, if the expected type is a CRL, check that the extension starts
598 if (ctx->expected_type != 0
599 && ctx->expected_type != OSSL_STORE_INFO_CRL)
601 } else if (ctx->expected_type == OSSL_STORE_INFO_CRL) {
606 * Last, check that the rest of the extension is a decimal number, at
607 * least one digit long.
609 if (!isdigit((unsigned char)*p))
611 while (isdigit((unsigned char)*p))
616 * One extra step here, check for a possible generation number.
619 for (p++; *p != '\0'; p++)
620 if (!ossl_isdigit((unsigned char)*p))
625 * If we've reached the end of the string at this point, we've successfully
626 * found a fitting file name.
631 static int file_load_dir_entry(struct file_ctx_st *ctx,
632 OSSL_CALLBACK *object_cb, void *object_cbarg,
633 OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
635 /* Prepare as much as possible in advance */
636 static const int object_type = OSSL_OBJECT_NAME;
637 OSSL_PARAM object[] = {
638 OSSL_PARAM_int(OSSL_OBJECT_PARAM_TYPE, (int *)&object_type),
639 OSSL_PARAM_utf8_string(OSSL_OBJECT_PARAM_DATA, NULL, 0),
642 char *newname = NULL;
645 /* Loop until we get an error or until we have a suitable name */
647 if (ctx->_.dir.last_entry == NULL) {
648 if (!ctx->_.dir.end_reached) {
649 assert(ctx->_.dir.last_errno != 0);
650 ERR_raise(ERR_LIB_SYS, ctx->_.dir.last_errno);
652 /* file_eof() will tell if EOF was reached */
656 /* flag acceptable names */
657 if (ctx->_.dir.last_entry[0] != '.'
658 && file_name_check(ctx, ctx->_.dir.last_entry)) {
660 /* If we can't allocate the new name, we fail */
662 file_name_to_uri(ctx, ctx->_.dir.last_entry)) == NULL)
667 * On the first call (with a NULL context), OPENSSL_DIR_read()
668 * cares about the second argument. On the following calls, it
669 * only cares that it isn't NULL. Therefore, we can safely give
672 ctx->_.dir.last_entry = OPENSSL_DIR_read(&ctx->_.dir.ctx, ctx->uri);
673 ctx->_.dir.last_errno = errno;
674 if (ctx->_.dir.last_entry == NULL && ctx->_.dir.last_errno == 0)
675 ctx->_.dir.end_reached = 1;
676 } while (newname == NULL);
678 object[1].data = newname;
679 object[1].data_size = strlen(newname);
680 ok = object_cb(object, object_cbarg);
681 OPENSSL_free(newname);
686 * Loading, local dispatcher
687 * -------------------------
690 static int file_load(void *loaderctx,
691 OSSL_CALLBACK *object_cb, void *object_cbarg,
692 OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
694 struct file_ctx_st *ctx = loaderctx;
698 return file_load_file(ctx, object_cb, object_cbarg, pw_cb, pw_cbarg);
701 file_load_dir_entry(ctx, object_cb, object_cbarg, pw_cb, pw_cbarg);
706 /* ctx->type has an unexpected value */
712 * Eof detection and closing
713 * -------------------------
716 static int file_eof(void *loaderctx)
718 struct file_ctx_st *ctx = loaderctx;
722 return ctx->_.dir.end_reached;
725 * BIO_pending() checks any filter BIO.
726 * BIO_eof() checks the source BIO.
728 return !BIO_pending(ctx->_.file.file)
729 && BIO_eof(ctx->_.file.file);
732 /* ctx->type has an unexpected value */
737 static int file_close_dir(struct file_ctx_st *ctx)
739 if (ctx->_.dir.ctx != NULL)
740 OPENSSL_DIR_end(&ctx->_.dir.ctx);
745 static int file_close_stream(struct file_ctx_st *ctx)
748 * This frees either the provider BIO filter (for file_attach()) OR
749 * the allocated file BIO (for file_open()).
751 BIO_free(ctx->_.file.file);
752 ctx->_.file.file = NULL;
758 static int file_close(void *loaderctx)
760 struct file_ctx_st *ctx = loaderctx;
764 return file_close_dir(ctx);
766 return file_close_stream(ctx);
769 /* ctx->type has an unexpected value */
774 const OSSL_DISPATCH ossl_file_store_functions[] = {
775 { OSSL_FUNC_STORE_OPEN, (void (*)(void))file_open },
776 { OSSL_FUNC_STORE_ATTACH, (void (*)(void))file_attach },
777 { OSSL_FUNC_STORE_SETTABLE_CTX_PARAMS,
778 (void (*)(void))file_settable_ctx_params },
779 { OSSL_FUNC_STORE_SET_CTX_PARAMS, (void (*)(void))file_set_ctx_params },
780 { OSSL_FUNC_STORE_LOAD, (void (*)(void))file_load },
781 { OSSL_FUNC_STORE_EOF, (void (*)(void))file_eof },
782 { OSSL_FUNC_STORE_CLOSE, (void (*)(void))file_close },