2 * Copyright 2020 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
11 * A filtering provider for test purposes. We pass all calls through to the
12 * default provider except where we want other behaviour for a test.
16 #include <openssl/core.h>
17 #include <openssl/core_dispatch.h>
18 #include <openssl/provider.h>
19 #include <openssl/crypto.h>
21 OSSL_provider_init_fn filter_provider_init;
23 int filter_provider_set_filter(int operation, const char *name);
25 #define MAX_FILTERS 10
26 #define MAX_ALG_FILTERS 5
28 struct filter_prov_globals_st {
33 OSSL_ALGORITHM alg[MAX_ALG_FILTERS + 1];
34 } dispatch[MAX_FILTERS];
39 static struct filter_prov_globals_st ourglobals;
41 static struct filter_prov_globals_st *get_globals(void)
44 * Ideally we'd like to store this in the OSSL_LIB_CTX so that we can have
45 * more than one instance of the filter provider at a time. But for now we
46 * just make it simple.
51 static OSSL_FUNC_provider_gettable_params_fn filter_gettable_params;
52 static OSSL_FUNC_provider_get_params_fn filter_get_params;
53 static OSSL_FUNC_provider_query_operation_fn filter_query;
54 static OSSL_FUNC_provider_teardown_fn filter_teardown;
56 static const OSSL_PARAM *filter_gettable_params(void *provctx)
58 struct filter_prov_globals_st *globs = get_globals();
60 return OSSL_PROVIDER_gettable_params(globs->deflt);
63 static int filter_get_params(void *provctx, OSSL_PARAM params[])
65 struct filter_prov_globals_st *globs = get_globals();
67 return OSSL_PROVIDER_get_params(globs->deflt, params);
70 static int filter_get_capabilities(void *provctx, const char *capability,
71 OSSL_CALLBACK *cb, void *arg)
73 struct filter_prov_globals_st *globs = get_globals();
75 return OSSL_PROVIDER_get_capabilities(globs->deflt, capability, cb, arg);
78 static const OSSL_ALGORITHM *filter_query(void *provctx,
82 struct filter_prov_globals_st *globs = get_globals();
85 for (i = 0; i < globs->num_dispatch; i++) {
86 if (globs->dispatch[i].operation == operation_id) {
87 *no_cache = globs->no_cache;
88 return globs->dispatch[i].alg;
92 /* No filter set, so pass it down to the chained provider */
93 return OSSL_PROVIDER_query_operation(globs->deflt, operation_id, no_cache);
96 static void filter_teardown(void *provctx)
98 struct filter_prov_globals_st *globs = get_globals();
100 OSSL_PROVIDER_unload(globs->deflt);
101 OSSL_LIB_CTX_free(globs->libctx);
104 /* Functions we provide to the core */
105 static const OSSL_DISPATCH filter_dispatch_table[] = {
106 { OSSL_FUNC_PROVIDER_GETTABLE_PARAMS, (void (*)(void))filter_gettable_params },
107 { OSSL_FUNC_PROVIDER_GET_PARAMS, (void (*)(void))filter_get_params },
108 { OSSL_FUNC_PROVIDER_QUERY_OPERATION, (void (*)(void))filter_query },
109 { OSSL_FUNC_PROVIDER_GET_CAPABILITIES, (void (*)(void))filter_get_capabilities },
110 { OSSL_FUNC_PROVIDER_TEARDOWN, (void (*)(void))filter_teardown },
114 int filter_provider_init(const OSSL_CORE_HANDLE *handle,
115 const OSSL_DISPATCH *in,
116 const OSSL_DISPATCH **out,
119 memset(&ourglobals, 0, sizeof(ourglobals));
120 ourglobals.libctx = OSSL_LIB_CTX_new();
121 if (ourglobals.libctx == NULL)
124 ourglobals.deflt = OSSL_PROVIDER_load(ourglobals.libctx, "default");
125 if (ourglobals.deflt == NULL)
128 *provctx = OSSL_PROVIDER_get0_provider_ctx(ourglobals.deflt);
129 *out = filter_dispatch_table;
133 OSSL_PROVIDER_unload(ourglobals.deflt);
134 OSSL_LIB_CTX_free(ourglobals.libctx);
139 * Set a filter for the given operation id. The filter string is a colon
140 * separated list of algorithms that will be made available by this provider.
141 * Anything not in the filter will be suppressed. If a filter is not set for
142 * a given operation id then all algorithms are made available.
144 int filter_provider_set_filter(int operation, const char *filterstr)
147 int algnum = 0, last = 0, ret = 0;
148 struct filter_prov_globals_st *globs = get_globals();
150 char *filterstrtmp = OPENSSL_strdup(filterstr);
152 const OSSL_ALGORITHM *provalgs = OSSL_PROVIDER_query_operation(globs->deflt,
155 const OSSL_ALGORITHM *algs;
157 if (filterstrtmp == NULL)
160 /* Nothing to filter */
161 if (provalgs == NULL)
164 if (globs->num_dispatch >= MAX_FILTERS)
167 for (name = filterstrtmp; !last; name = (sep == NULL ? NULL : sep + 1)) {
168 sep = strstr(name, ":");
173 namelen = strlen(name);
175 for (algs = provalgs; algs->algorithm_names != NULL; algs++) {
176 const char *found = strstr(algs->algorithm_names, name);
180 if (found[namelen] != '\0' && found[namelen] != ':')
182 if (found != algs->algorithm_names && found[-1] != ':')
185 /* We found a match */
186 if (algnum >= MAX_ALG_FILTERS)
189 globs->dispatch[globs->num_dispatch].alg[algnum++] = *algs;
192 if (algs->algorithm_names == NULL) {
198 globs->dispatch[globs->num_dispatch].operation = operation;
199 globs->no_cache = no_cache;
200 globs->num_dispatch++;
204 OPENSSL_free(filterstrtmp);