1 /* 2 * Copyright 2015-2020 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 <openssl/crypto.h> 11 12 #include "testutil.h" 13 #include "../e_os.h" 14 15 static int test_sec_mem(void) 16 { 17 #ifndef OPENSSL_NO_SECURE_MEMORY 18 int testresult = 0; 19 char *p = NULL, *q = NULL, *r = NULL, *s = NULL; 20 21 TEST_info("Secure memory is implemented."); 22 23 s = OPENSSL_secure_malloc(20); 24 /* s = non-secure 20 */ 25 if (!TEST_ptr(s) 26 || !TEST_false(CRYPTO_secure_allocated(s))) 27 goto end; 28 r = OPENSSL_secure_malloc(20); 29 /* r = non-secure 20, s = non-secure 20 */ 30 if (!TEST_ptr(r) 31 || !TEST_true(CRYPTO_secure_malloc_init(4096, 32)) 32 || !TEST_false(CRYPTO_secure_allocated(r))) 33 goto end; 34 p = OPENSSL_secure_malloc(20); 35 if (!TEST_ptr(p) 36 /* r = non-secure 20, p = secure 20, s = non-secure 20 */ 37 || !TEST_true(CRYPTO_secure_allocated(p)) 38 /* 20 secure -> 32-byte minimum allocation unit */ 39 || !TEST_size_t_eq(CRYPTO_secure_used(), 32)) 40 goto end; 41 q = OPENSSL_malloc(20); 42 if (!TEST_ptr(q)) 43 goto end; 44 /* r = non-secure 20, p = secure 20, q = non-secure 20, s = non-secure 20 */ 45 if (!TEST_false(CRYPTO_secure_allocated(q))) 46 goto end; 47 OPENSSL_secure_clear_free(s, 20); 48 s = OPENSSL_secure_malloc(20); 49 if (!TEST_ptr(s) 50 /* r = non-secure 20, p = secure 20, q = non-secure 20, s = secure 20 */ 51 || !TEST_true(CRYPTO_secure_allocated(s)) 52 /* 2 * 20 secure -> 64 bytes allocated */ 53 || !TEST_size_t_eq(CRYPTO_secure_used(), 64)) 54 goto end; 55 OPENSSL_secure_clear_free(p, 20); 56 p = NULL; 57 /* 20 secure -> 32 bytes allocated */ 58 if (!TEST_size_t_eq(CRYPTO_secure_used(), 32)) 59 goto end; 60 OPENSSL_free(q); 61 q = NULL; 62 /* should not complete, as secure memory is still allocated */ 63 if (!TEST_false(CRYPTO_secure_malloc_done()) 64 || !TEST_true(CRYPTO_secure_malloc_initialized())) 65 goto end; 66 OPENSSL_secure_free(s); 67 s = NULL; 68 /* secure memory should now be 0, so done should complete */ 69 if (!TEST_size_t_eq(CRYPTO_secure_used(), 0) 70 || !TEST_true(CRYPTO_secure_malloc_done()) 71 || !TEST_false(CRYPTO_secure_malloc_initialized())) 72 goto end; 73 74 TEST_info("Possible infinite loop: allocate more than available"); 75 if (!TEST_true(CRYPTO_secure_malloc_init(32768, 16))) 76 goto end; 77 TEST_ptr_null(OPENSSL_secure_malloc((size_t)-1)); 78 TEST_true(CRYPTO_secure_malloc_done()); 79 80 /* 81 * If init fails, then initialized should be false, if not, this 82 * could cause an infinite loop secure_malloc, but we don't test it 83 */ 84 if (TEST_false(CRYPTO_secure_malloc_init(16, 16)) && 85 !TEST_false(CRYPTO_secure_malloc_initialized())) { 86 TEST_true(CRYPTO_secure_malloc_done()); 87 goto end; 88 } 89 90 /*- 91 * There was also a possible infinite loop when the number of 92 * elements was 1<<31, as |int i| was set to that, which is a 93 * negative number. However, it requires minimum input values: 94 * 95 * CRYPTO_secure_malloc_init((size_t)1<<34, 1<<4); 96 * 97 * Which really only works on 64-bit systems, since it took 16 GB 98 * secure memory arena to trigger the problem. It naturally takes 99 * corresponding amount of available virtual and physical memory 100 * for test to be feasible/representative. Since we can't assume 101 * that every system is equipped with that much memory, the test 102 * remains disabled. If the reader of this comment really wants 103 * to make sure that infinite loop is fixed, they can enable the 104 * code below. 105 */ 106 # if 0 107 /*- 108 * On Linux and BSD this test has a chance to complete in minimal 109 * time and with minimum side effects, because mlock is likely to 110 * fail because of RLIMIT_MEMLOCK, which is customarily [much] 111 * smaller than 16GB. In other words Linux and BSD users can be 112 * limited by virtual space alone... 113 */ 114 if (sizeof(size_t) > 4) { 115 TEST_info("Possible infinite loop: 1<<31 limit"); 116 if (TEST_true(CRYPTO_secure_malloc_init((size_t)1<<34, 1<<4) != 0)) 117 TEST_true(CRYPTO_secure_malloc_done()); 118 } 119 # endif 120 121 /* this can complete - it was not really secure */ 122 testresult = 1; 123 end: 124 OPENSSL_secure_free(p); 125 OPENSSL_free(q); 126 OPENSSL_secure_free(r); 127 OPENSSL_secure_free(s); 128 return testresult; 129 #else 130 TEST_info("Secure memory is *not* implemented."); 131 /* Should fail. */ 132 return TEST_false(CRYPTO_secure_malloc_init(4096, 32)); 133 #endif 134 } 135 136 static int test_sec_mem_clear(void) 137 { 138 #ifndef OPENSSL_NO_SECURE_MEMORY 139 const int size = 64; 140 unsigned char *p = NULL; 141 int i, res = 0; 142 143 if (!TEST_true(CRYPTO_secure_malloc_init(4096, 32)) 144 || !TEST_ptr(p = OPENSSL_secure_malloc(size))) 145 goto err; 146 147 for (i = 0; i < size; i++) 148 if (!TEST_uchar_eq(p[i], 0)) 149 goto err; 150 151 for (i = 0; i < size; i++) 152 p[i] = (unsigned char)(i + ' ' + 1); 153 154 OPENSSL_secure_free(p); 155 156 /* 157 * A deliberate use after free here to verify that the memory has been 158 * cleared properly. Since secure free doesn't return the memory to 159 * libc's memory pool, it technically isn't freed. However, the header 160 * bytes have to be skipped and these consist of two pointers in the 161 * current implementation. 162 */ 163 for (i = sizeof(void *) * 2; i < size; i++) 164 if (!TEST_uchar_eq(p[i], 0)) 165 return 0; 166 167 res = 1; 168 p = NULL; 169 err: 170 OPENSSL_secure_free(p); 171 CRYPTO_secure_malloc_done(); 172 return res; 173 #else 174 return 1; 175 #endif 176 } 177 178 int setup_tests(void) 179 { 180 ADD_TEST(test_sec_mem); 181 ADD_TEST(test_sec_mem_clear); 182 return 1; 183 } 184