426 lines
12 KiB
C
426 lines
12 KiB
C
/* BEGIN_HEADER */
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/** \file test_suite_constant_time.function
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*
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* Functional testing of functions in the constant_time module.
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*
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* The tests are instrumented with #TEST_CF_SECRET and #TEST_CF_PUBLIC
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* (see tests/include/test/constant_flow.h) so that running the tests
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* under MSan or Valgrind will detect a non-constant-time implementation.
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*/
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#include <stdio.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <mbedtls/bignum.h>
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#include <mbedtls/constant_time.h>
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#include <constant_time_internal.h>
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#include <test/constant_flow.h>
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/* END_HEADER */
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/* BEGIN_CASE */
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void mbedtls_ct_memcmp_null()
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{
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uint32_t x = 0;
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TEST_ASSERT(mbedtls_ct_memcmp(&x, NULL, 0) == 0);
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TEST_ASSERT(mbedtls_ct_memcmp(NULL, &x, 0) == 0);
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TEST_ASSERT(mbedtls_ct_memcmp(NULL, NULL, 0) == 0);
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void mbedtls_ct_bool(char *input)
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{
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mbedtls_ct_uint_t v = (mbedtls_ct_uint_t) strtoull(input, NULL, 16);
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TEST_ASSERT(errno == 0);
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mbedtls_ct_condition_t expected = (v != 0) ? MBEDTLS_CT_TRUE : MBEDTLS_CT_FALSE;
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TEST_CF_SECRET(&v, sizeof(v));
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TEST_EQUAL(mbedtls_ct_bool(v), expected);
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TEST_CF_PUBLIC(&v, sizeof(v));
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void mbedtls_ct_bool_xxx(char *x_str, char *y_str)
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{
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mbedtls_ct_uint_t x = strtoull(x_str, NULL, 0);
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mbedtls_ct_uint_t y = strtoull(y_str, NULL, 0);
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mbedtls_ct_uint_t x1 = x;
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mbedtls_ct_uint_t y1 = y;
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TEST_CF_SECRET(&x, sizeof(x));
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TEST_CF_SECRET(&y, sizeof(y));
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mbedtls_ct_condition_t expected = x1 ? MBEDTLS_CT_FALSE : MBEDTLS_CT_TRUE;
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TEST_EQUAL(mbedtls_ct_bool_not(mbedtls_ct_bool(x)), expected);
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expected = x1 != y1 ? MBEDTLS_CT_TRUE : MBEDTLS_CT_FALSE;
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TEST_EQUAL(mbedtls_ct_uint_ne(x, y), expected);
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expected = x1 == y1 ? MBEDTLS_CT_TRUE : MBEDTLS_CT_FALSE;
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TEST_EQUAL(mbedtls_ct_uint_eq(x, y), expected);
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expected = x1 > y1 ? MBEDTLS_CT_TRUE : MBEDTLS_CT_FALSE;
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TEST_EQUAL(mbedtls_ct_uint_gt(x, y), expected);
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expected = x1 < y1 ? MBEDTLS_CT_TRUE : MBEDTLS_CT_FALSE;
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TEST_EQUAL(mbedtls_ct_uint_lt(x, y), expected);
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expected = x1 >= y1 ? MBEDTLS_CT_TRUE : MBEDTLS_CT_FALSE;
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TEST_EQUAL(mbedtls_ct_uint_ge(x, y), expected);
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expected = x1 <= y1 ? MBEDTLS_CT_TRUE : MBEDTLS_CT_FALSE;
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TEST_EQUAL(mbedtls_ct_uint_le(x, y), expected);
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expected = (!!x1) ^ (!!y1) ? MBEDTLS_CT_TRUE : MBEDTLS_CT_FALSE;
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TEST_EQUAL(mbedtls_ct_bool_xor(mbedtls_ct_bool(x), mbedtls_ct_bool(y)), expected);
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expected = (!!x1) && (!!y1) ? MBEDTLS_CT_TRUE : MBEDTLS_CT_FALSE;
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TEST_EQUAL(mbedtls_ct_bool_and(mbedtls_ct_bool(x), mbedtls_ct_bool(y)), expected);
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expected = (!!x1) || (!!y1) ? MBEDTLS_CT_TRUE : MBEDTLS_CT_FALSE;
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TEST_EQUAL(mbedtls_ct_bool_or(mbedtls_ct_bool(x), mbedtls_ct_bool(y)), expected);
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TEST_CF_PUBLIC(&x, sizeof(x));
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TEST_CF_PUBLIC(&y, sizeof(y));
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:MBEDTLS_BASE64_C */
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void mbedtls_ct_uchar_in_range_if(int li, int hi, int ti)
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{
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unsigned char l = li, h = hi, t = ti;
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for (unsigned x = 0; x <= 255; x++) {
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unsigned char expected = (x >= l) && (x <= h) ? t : 0;
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TEST_CF_SECRET(&x, sizeof(x));
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TEST_CF_SECRET(&l, sizeof(l));
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TEST_CF_SECRET(&h, sizeof(h));
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TEST_CF_SECRET(&t, sizeof(t));
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TEST_EQUAL(mbedtls_ct_uchar_in_range_if(l, h, (unsigned char) x, t), expected);
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TEST_CF_PUBLIC(&x, sizeof(x));
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TEST_CF_PUBLIC(&l, sizeof(l));
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TEST_CF_PUBLIC(&h, sizeof(h));
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TEST_CF_PUBLIC(&t, sizeof(t));
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}
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void mbedtls_ct_if(char *c_str, char *t_str, char *f_str)
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{
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mbedtls_ct_condition_t c = mbedtls_ct_bool(strtoull(c_str, NULL, 16));
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mbedtls_ct_uint_t t = (mbedtls_ct_uint_t) strtoull(t_str, NULL, 16);
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mbedtls_ct_uint_t f = (mbedtls_ct_uint_t) strtoull(f_str, NULL, 16);
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mbedtls_ct_uint_t expected = c ? t : f;
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mbedtls_ct_uint_t expected0 = c ? t : 0;
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TEST_CF_SECRET(&c, sizeof(c));
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TEST_CF_SECRET(&t, sizeof(t));
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TEST_CF_SECRET(&f, sizeof(f));
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TEST_EQUAL(mbedtls_ct_if(c, t, f), expected);
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TEST_EQUAL(mbedtls_ct_size_if(c, t, f), (size_t) expected);
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TEST_EQUAL(mbedtls_ct_uint_if(c, t, f), (unsigned) expected);
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#if defined(MBEDTLS_BIGNUM_C)
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TEST_EQUAL(mbedtls_ct_mpi_uint_if(c, t, f), (mbedtls_mpi_uint) expected);
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#endif
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TEST_EQUAL(mbedtls_ct_uint_if_else_0(c, t), (unsigned) expected0);
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TEST_EQUAL(mbedtls_ct_size_if_else_0(c, (size_t) t), (size_t) expected0);
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#if defined(MBEDTLS_BIGNUM_C)
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TEST_EQUAL(mbedtls_ct_mpi_uint_if_else_0(c, t), (mbedtls_mpi_uint) expected0);
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#endif
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TEST_CF_PUBLIC(&c, sizeof(c));
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TEST_CF_PUBLIC(&t, sizeof(t));
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TEST_CF_PUBLIC(&f, sizeof(f));
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:MBEDTLS_PKCS1_V15:MBEDTLS_RSA_C:!MBEDTLS_RSA_ALT */
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void mbedtls_ct_zeroize_if(char *c_str, int len)
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{
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uint8_t *buf = NULL;
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mbedtls_ct_condition_t c = mbedtls_ct_bool(strtoull(c_str, NULL, 16));
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TEST_CALLOC(buf, len);
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for (size_t i = 0; i < (size_t) len; i++) {
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buf[i] = 1;
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}
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TEST_CF_SECRET(&c, sizeof(c));
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TEST_CF_SECRET(buf, len);
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mbedtls_ct_zeroize_if(c, buf, len);
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TEST_CF_PUBLIC(&c, sizeof(c));
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TEST_CF_PUBLIC(buf, len);
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for (size_t i = 0; i < (size_t) len; i++) {
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TEST_EQUAL(buf[i], c != 0 ? 0 : 1);
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}
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exit:
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mbedtls_free(buf);
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void mbedtls_ct_memcmp_single_bit_diff()
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{
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uint8_t *a = NULL, *b = NULL;
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size_t size = 32;
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TEST_CALLOC(a, size);
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TEST_CALLOC(b, size);
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TEST_CF_SECRET(a, size);
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TEST_CF_SECRET(b, size);
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int result = mbedtls_ct_memcmp(a, b, size);
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TEST_CF_PUBLIC(a, size);
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TEST_CF_PUBLIC(b, size);
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TEST_CF_PUBLIC(&result, sizeof(result));
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TEST_EQUAL(result, 0);
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for (size_t offset = 0; offset < size; offset++) {
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for (size_t bit_offset = 0; bit_offset < 8; bit_offset++) {
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/* Set a single bit to be different at given offset, to test that we
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detect single-bit differences */
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a[offset] = 1 << bit_offset;
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TEST_CF_SECRET(a, size);
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TEST_CF_SECRET(b, size);
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result = mbedtls_ct_memcmp(a, b, size);
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TEST_CF_PUBLIC(a, size);
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TEST_CF_PUBLIC(b, size);
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TEST_CF_PUBLIC(&result, sizeof(result));
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TEST_ASSERT(result != 0);
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a[offset] = 0;
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}
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}
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exit:
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mbedtls_free(a);
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mbedtls_free(b);
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void mbedtls_ct_memcmp(int same, int size, int offset)
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{
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uint8_t *a = NULL, *b = NULL;
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TEST_CALLOC(a, size + offset);
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TEST_CALLOC(b, size + offset);
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/* Construct data that matches, if same == -1, otherwise
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* same gives the number of bytes (after the initial offset)
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* that will match; after that it will differ.
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*/
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for (int i = 0; i < size + offset; i++) {
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a[i] = i & 0xff;
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if (same == -1 || (i - offset) < same) {
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b[i] = a[i];
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} else {
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b[i] = (i + 1) & 0xff;
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}
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}
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int reference = memcmp(a + offset, b + offset, size);
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TEST_CF_SECRET(a, size + offset);
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TEST_CF_SECRET(b, size + offset);
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int actual = mbedtls_ct_memcmp(a + offset, b + offset, size);
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TEST_CF_PUBLIC(a, size + offset);
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TEST_CF_PUBLIC(b, size + offset);
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TEST_CF_PUBLIC(&actual, sizeof(actual));
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if (same == -1 || same >= size) {
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TEST_ASSERT(reference == 0);
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TEST_ASSERT(actual == 0);
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} else {
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TEST_ASSERT(reference != 0);
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TEST_ASSERT(actual != 0);
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}
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exit:
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mbedtls_free(a);
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mbedtls_free(b);
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void mbedtls_ct_memcpy_if(int eq, int size, int offset)
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{
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uint8_t *src = NULL, *src2 = NULL, *result = NULL, *expected = NULL;
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TEST_CALLOC(src, size + offset);
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TEST_CALLOC(src2, size + offset);
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TEST_CALLOC(result, size + offset);
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TEST_CALLOC(expected, size + offset);
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/* Apply offset to result only */
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for (int i = 0; i < size + offset; i++) {
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src[i] = 1;
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result[i] = 0xff;
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expected[i] = eq ? 1 : 0xff;
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}
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int secret_eq = eq;
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TEST_CF_SECRET(&secret_eq, sizeof(secret_eq));
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TEST_CF_SECRET(src, size + offset);
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TEST_CF_SECRET(result, size + offset);
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mbedtls_ct_memcpy_if(mbedtls_ct_bool(secret_eq), result + offset, src, NULL, size);
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TEST_CF_PUBLIC(&secret_eq, sizeof(secret_eq));
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TEST_CF_PUBLIC(src, size + offset);
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TEST_CF_PUBLIC(result, size + offset);
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TEST_MEMORY_COMPARE(expected, size, result + offset, size);
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/* Apply offset to src only */
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for (int i = 0; i < size + offset; i++) {
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src[i] = 1;
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result[i] = 0xff;
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expected[i] = eq ? 1 : 0xff;
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}
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TEST_CF_SECRET(&secret_eq, sizeof(secret_eq));
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TEST_CF_SECRET(src, size + offset);
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TEST_CF_SECRET(result, size + offset);
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mbedtls_ct_memcpy_if(mbedtls_ct_bool(secret_eq), result, src + offset, NULL, size);
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TEST_CF_PUBLIC(&secret_eq, sizeof(secret_eq));
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TEST_CF_PUBLIC(src, size + offset);
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TEST_CF_PUBLIC(result, size + offset);
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TEST_MEMORY_COMPARE(expected, size, result, size);
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/* Apply offset to src and src2 */
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for (int i = 0; i < size + offset; i++) {
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src[i] = 1;
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src2[i] = 2;
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result[i] = 0xff;
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expected[i] = eq ? 1 : 2;
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}
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TEST_CF_SECRET(&secret_eq, sizeof(secret_eq));
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TEST_CF_SECRET(src, size + offset);
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TEST_CF_SECRET(src2, size + offset);
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TEST_CF_SECRET(result, size + offset);
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mbedtls_ct_memcpy_if(mbedtls_ct_bool(secret_eq), result, src + offset, src2 + offset, size);
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TEST_CF_PUBLIC(&secret_eq, sizeof(secret_eq));
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TEST_CF_PUBLIC(src, size + offset);
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TEST_CF_SECRET(src2, size + offset);
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TEST_CF_PUBLIC(result, size + offset);
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TEST_MEMORY_COMPARE(expected, size, result, size);
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/* result == src == dest */
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for (int i = 0; i < size + offset; i++) {
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src[i] = 2;
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expected[i] = 2;
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}
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TEST_CF_SECRET(&secret_eq, sizeof(secret_eq));
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TEST_CF_SECRET(src, size + offset);
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TEST_CF_SECRET(result, size + offset);
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mbedtls_ct_memcpy_if(mbedtls_ct_bool(secret_eq), src + offset, src + offset, src + offset,
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size);
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TEST_CF_PUBLIC(&secret_eq, sizeof(secret_eq));
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TEST_CF_PUBLIC(src, size + offset);
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TEST_CF_PUBLIC(result, size + offset);
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TEST_MEMORY_COMPARE(expected, size, src + offset, size);
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exit:
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mbedtls_free(src);
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mbedtls_free(src2);
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mbedtls_free(result);
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mbedtls_free(expected);
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:MBEDTLS_PKCS1_V15:MBEDTLS_RSA_C:!MBEDTLS_RSA_ALT */
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void mbedtls_ct_memmove_left(int len, int offset)
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{
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size_t l = (size_t) len;
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size_t o = (size_t) offset;
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uint8_t *buf = NULL, *buf_expected = NULL;
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TEST_CALLOC(buf, l);
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TEST_CALLOC(buf_expected, l);
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for (size_t i = 0; i < l; i++) {
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buf[i] = (uint8_t) i;
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buf_expected[i] = buf[i];
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}
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TEST_CF_SECRET(&o, sizeof(o));
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TEST_CF_SECRET(buf, l);
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mbedtls_ct_memmove_left(buf, l, o);
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TEST_CF_PUBLIC(&o, sizeof(o));
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TEST_CF_PUBLIC(buf, l);
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if (l > 0) {
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memmove(buf_expected, buf_expected + o, l - o);
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memset(buf_expected + (l - o), 0, o);
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TEST_ASSERT(memcmp(buf, buf_expected, l) == 0);
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}
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exit:
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mbedtls_free(buf);
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mbedtls_free(buf_expected);
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void mbedtls_ct_memcpy_offset(int offset_min, int offset_max, int len)
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{
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unsigned char *dst = NULL;
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unsigned char *src = NULL;
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size_t src_len = offset_max + len;
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size_t secret;
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TEST_CALLOC(dst, len);
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TEST_CALLOC(src, src_len);
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/* Fill src in a way that we can detect if we copied the right bytes */
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mbedtls_test_rnd_std_rand(NULL, src, src_len);
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for (secret = offset_min; secret <= (size_t) offset_max; secret++) {
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mbedtls_test_set_step((int) secret);
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TEST_CF_SECRET(&secret, sizeof(secret));
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TEST_CF_SECRET(src, len);
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TEST_CF_SECRET(dst, len);
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mbedtls_ct_memcpy_offset(dst, src, secret,
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offset_min, offset_max, len);
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TEST_CF_PUBLIC(&secret, sizeof(secret));
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TEST_CF_PUBLIC(src, len);
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TEST_CF_PUBLIC(dst, len);
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TEST_MEMORY_COMPARE(dst, len, src + secret, len);
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}
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exit:
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mbedtls_free(dst);
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mbedtls_free(src);
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}
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/* END_CASE */
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