1 /*
2 * Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 * https://www.openssl.org/source/license.html
8 * or in the file LICENSE in the source distribution.
9 */
10
11 #include <string.h>
12 #include <openssl/core_names.h>
13 #include <openssl/rand.h>
14 #include <openssl/provider.h>
15 #include "../include/crypto/evp.h"
16 #include "../../crypto/evp/evp_local.h"
17 #include "../testutil.h"
18
19 typedef struct {
20 fake_random_generate_cb *cb;
21 int state;
22 const char *name;
23 EVP_RAND_CTX *ctx;
24 } FAKE_RAND;
25
26 static OSSL_FUNC_rand_newctx_fn fake_rand_newctx;
27 static OSSL_FUNC_rand_freectx_fn fake_rand_freectx;
28 static OSSL_FUNC_rand_instantiate_fn fake_rand_instantiate;
29 static OSSL_FUNC_rand_uninstantiate_fn fake_rand_uninstantiate;
30 static OSSL_FUNC_rand_generate_fn fake_rand_generate;
31 static OSSL_FUNC_rand_gettable_ctx_params_fn fake_rand_gettable_ctx_params;
32 static OSSL_FUNC_rand_get_ctx_params_fn fake_rand_get_ctx_params;
33 static OSSL_FUNC_rand_enable_locking_fn fake_rand_enable_locking;
34
fake_rand_newctx(void * provctx,void * parent,const OSSL_DISPATCH * parent_dispatch)35 static void *fake_rand_newctx(void *provctx, void *parent,
36 const OSSL_DISPATCH *parent_dispatch)
37 {
38 FAKE_RAND *r = OPENSSL_zalloc(sizeof(*r));
39
40 if (r != NULL)
41 r->state = EVP_RAND_STATE_UNINITIALISED;
42 return r;
43 }
44
fake_rand_freectx(void * vrng)45 static void fake_rand_freectx(void *vrng)
46 {
47 OPENSSL_free(vrng);
48 }
49
fake_rand_instantiate(void * vrng,ossl_unused unsigned int strength,ossl_unused int prediction_resistance,ossl_unused const unsigned char * pstr,size_t pstr_len,ossl_unused const OSSL_PARAM params[])50 static int fake_rand_instantiate(void *vrng, ossl_unused unsigned int strength,
51 ossl_unused int prediction_resistance,
52 ossl_unused const unsigned char *pstr,
53 size_t pstr_len,
54 ossl_unused const OSSL_PARAM params[])
55 {
56 FAKE_RAND *frng = (FAKE_RAND *)vrng;
57
58 frng->state = EVP_RAND_STATE_READY;
59 return 1;
60 }
61
fake_rand_uninstantiate(void * vrng)62 static int fake_rand_uninstantiate(void *vrng)
63 {
64 FAKE_RAND *frng = (FAKE_RAND *)vrng;
65
66 frng->state = EVP_RAND_STATE_UNINITIALISED;
67 return 1;
68 }
69
fake_rand_generate(void * vrng,unsigned char * out,size_t outlen,unsigned int strength,int prediction_resistance,const unsigned char * adin,size_t adinlen)70 static int fake_rand_generate(void *vrng, unsigned char *out, size_t outlen,
71 unsigned int strength, int prediction_resistance,
72 const unsigned char *adin, size_t adinlen)
73 {
74 FAKE_RAND *frng = (FAKE_RAND *)vrng;
75 size_t l;
76 uint32_t r;
77
78 if (frng->cb != NULL)
79 return (*frng->cb)(out, outlen, frng->name, frng->ctx);
80 while (outlen > 0) {
81 r = test_random();
82 l = outlen < sizeof(r) ? outlen : sizeof(r);
83
84 memcpy(out, &r, l);
85 out += l;
86 outlen -= l;
87 }
88 return 1;
89 }
90
fake_rand_enable_locking(void * vrng)91 static int fake_rand_enable_locking(void *vrng)
92 {
93 return 1;
94 }
95
fake_rand_get_ctx_params(ossl_unused void * vrng,OSSL_PARAM params[])96 static int fake_rand_get_ctx_params(ossl_unused void *vrng, OSSL_PARAM params[])
97 {
98 FAKE_RAND *frng = (FAKE_RAND *)vrng;
99 OSSL_PARAM *p;
100
101 p = OSSL_PARAM_locate(params, OSSL_RAND_PARAM_STATE);
102 if (p != NULL && !OSSL_PARAM_set_int(p, frng->state))
103 return 0;
104
105 p = OSSL_PARAM_locate(params, OSSL_RAND_PARAM_STRENGTH);
106 if (p != NULL && !OSSL_PARAM_set_int(p, 256))
107 return 0;
108
109 p = OSSL_PARAM_locate(params, OSSL_RAND_PARAM_MAX_REQUEST);
110 if (p != NULL && !OSSL_PARAM_set_size_t(p, INT_MAX))
111 return 0;
112 return 1;
113 }
114
fake_rand_gettable_ctx_params(ossl_unused void * vrng,ossl_unused void * provctx)115 static const OSSL_PARAM *fake_rand_gettable_ctx_params(ossl_unused void *vrng,
116 ossl_unused void *provctx)
117 {
118 static const OSSL_PARAM known_gettable_ctx_params[] = {
119 OSSL_PARAM_int(OSSL_RAND_PARAM_STATE, NULL),
120 OSSL_PARAM_uint(OSSL_RAND_PARAM_STRENGTH, NULL),
121 OSSL_PARAM_size_t(OSSL_RAND_PARAM_MAX_REQUEST, NULL),
122 OSSL_PARAM_END
123 };
124 return known_gettable_ctx_params;
125 }
126
127 static const OSSL_DISPATCH fake_rand_functions[] = {
128 { OSSL_FUNC_RAND_NEWCTX, (void (*)(void))fake_rand_newctx },
129 { OSSL_FUNC_RAND_FREECTX, (void (*)(void))fake_rand_freectx },
130 { OSSL_FUNC_RAND_INSTANTIATE, (void (*)(void))fake_rand_instantiate },
131 { OSSL_FUNC_RAND_UNINSTANTIATE, (void (*)(void))fake_rand_uninstantiate },
132 { OSSL_FUNC_RAND_GENERATE, (void (*)(void))fake_rand_generate },
133 { OSSL_FUNC_RAND_ENABLE_LOCKING, (void (*)(void))fake_rand_enable_locking },
134 { OSSL_FUNC_RAND_GETTABLE_CTX_PARAMS,
135 (void(*)(void))fake_rand_gettable_ctx_params },
136 { OSSL_FUNC_RAND_GET_CTX_PARAMS, (void(*)(void))fake_rand_get_ctx_params },
137 { 0, NULL }
138 };
139
140 static const OSSL_ALGORITHM fake_rand_rand[] = {
141 { "FAKE", "provider=fake", fake_rand_functions },
142 { NULL, NULL, NULL }
143 };
144
fake_rand_query(void * provctx,int operation_id,int * no_cache)145 static const OSSL_ALGORITHM *fake_rand_query(void *provctx,
146 int operation_id,
147 int *no_cache)
148 {
149 *no_cache = 0;
150 switch (operation_id) {
151 case OSSL_OP_RAND:
152 return fake_rand_rand;
153 }
154 return NULL;
155 }
156
157 /* Functions we provide to the core */
158 static const OSSL_DISPATCH fake_rand_method[] = {
159 { OSSL_FUNC_PROVIDER_TEARDOWN, (void (*)(void))OSSL_LIB_CTX_free },
160 { OSSL_FUNC_PROVIDER_QUERY_OPERATION, (void (*)(void))fake_rand_query },
161 { 0, NULL }
162 };
163
fake_rand_provider_init(const OSSL_CORE_HANDLE * handle,const OSSL_DISPATCH * in,const OSSL_DISPATCH ** out,void ** provctx)164 static int fake_rand_provider_init(const OSSL_CORE_HANDLE *handle,
165 const OSSL_DISPATCH *in,
166 const OSSL_DISPATCH **out, void **provctx)
167 {
168 if (!TEST_ptr(*provctx = OSSL_LIB_CTX_new()))
169 return 0;
170 *out = fake_rand_method;
171 return 1;
172 }
173
check_rng(EVP_RAND_CTX * rng,const char * name)174 static int check_rng(EVP_RAND_CTX *rng, const char *name)
175 {
176 FAKE_RAND *f;
177
178 if (!TEST_ptr(rng)) {
179 TEST_info("random: %s", name);
180 return 0;
181 }
182 f = rng->algctx;
183 f->name = name;
184 f->ctx = rng;
185 return 1;
186 }
187
fake_rand_start(OSSL_LIB_CTX * libctx)188 OSSL_PROVIDER *fake_rand_start(OSSL_LIB_CTX *libctx)
189 {
190 OSSL_PROVIDER *p;
191
192 if (!TEST_true(OSSL_PROVIDER_add_builtin(libctx, "fake-rand",
193 fake_rand_provider_init))
194 || !TEST_true(RAND_set_DRBG_type(libctx, "fake", NULL, NULL, NULL))
195 || !TEST_ptr(p = OSSL_PROVIDER_try_load(libctx, "fake-rand", 1)))
196 return NULL;
197
198 /* Ensure that the fake rand is initialized. */
199 if (!TEST_true(check_rng(RAND_get0_primary(libctx), "primary"))
200 || !TEST_true(check_rng(RAND_get0_private(libctx), "private"))
201 || !TEST_true(check_rng(RAND_get0_public(libctx), "public"))) {
202 OSSL_PROVIDER_unload(p);
203 return NULL;
204 }
205
206 return p;
207 }
208
fake_rand_finish(OSSL_PROVIDER * p)209 void fake_rand_finish(OSSL_PROVIDER *p)
210 {
211 OSSL_PROVIDER_unload(p);
212 }
213
fake_rand_set_callback(EVP_RAND_CTX * rng,int (* cb)(unsigned char * out,size_t outlen,const char * name,EVP_RAND_CTX * ctx))214 void fake_rand_set_callback(EVP_RAND_CTX *rng,
215 int (*cb)(unsigned char *out, size_t outlen,
216 const char *name, EVP_RAND_CTX *ctx))
217 {
218 if (rng != NULL)
219 ((FAKE_RAND *)rng->algctx)->cb = cb;
220 }
221
fake_rand_set_public_private_callbacks(OSSL_LIB_CTX * libctx,int (* cb)(unsigned char * out,size_t outlen,const char * name,EVP_RAND_CTX * ctx))222 void fake_rand_set_public_private_callbacks(OSSL_LIB_CTX *libctx,
223 int (*cb)(unsigned char *out,
224 size_t outlen,
225 const char *name,
226 EVP_RAND_CTX *ctx))
227 {
228 fake_rand_set_callback(RAND_get0_private(libctx), cb);
229 fake_rand_set_callback(RAND_get0_public(libctx), cb);
230 }
231
232
