534 lines
16 KiB
C
534 lines
16 KiB
C
/* BEGIN_HEADER */
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#include "mbedtls/entropy.h"
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#include "entropy_poll.h"
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#include "mbedtls/md.h"
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#include "string.h"
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typedef enum {
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DUMMY_CONSTANT_LENGTH, /* Output context->length bytes */
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DUMMY_REQUESTED_LENGTH, /* Output whatever length was requested */
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DUMMY_FAIL, /* Return an error code */
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} entropy_dummy_instruction;
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typedef struct {
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entropy_dummy_instruction instruction;
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size_t length; /* Length to return for DUMMY_CONSTANT_LENGTH */
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size_t calls; /* Incremented at each call */
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} entropy_dummy_context;
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/*
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* Dummy entropy source
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*
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* If data is NULL, write exactly the requested length.
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* Otherwise, write the length indicated by data or error if negative
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*/
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static int entropy_dummy_source(void *arg, unsigned char *output,
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size_t len, size_t *olen)
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{
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entropy_dummy_context *context = arg;
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++context->calls;
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switch (context->instruction) {
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case DUMMY_CONSTANT_LENGTH:
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*olen = context->length;
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break;
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case DUMMY_REQUESTED_LENGTH:
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*olen = len;
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break;
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case DUMMY_FAIL:
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return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
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}
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memset(output, 0x2a, *olen);
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return 0;
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}
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/*
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* Ability to clear entropy sources to allow testing with just predefined
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* entropy sources. This function or tests depending on it might break if there
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* are internal changes to how entropy sources are registered.
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*
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* To be called immediately after mbedtls_entropy_init().
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*
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* Just resetting the counter. New sources will overwrite existing ones.
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* This might break memory checks in the future if sources need 'free-ing' then
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* as well.
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*/
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static void entropy_clear_sources(mbedtls_entropy_context *ctx)
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{
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ctx->source_count = 0;
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}
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#if defined(MBEDTLS_ENTROPY_NV_SEED)
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/*
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* NV seed read/write functions that use a buffer instead of a file
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*/
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static unsigned char buffer_seed[MBEDTLS_ENTROPY_BLOCK_SIZE];
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int buffer_nv_seed_read(unsigned char *buf, size_t buf_len)
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{
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if (buf_len != MBEDTLS_ENTROPY_BLOCK_SIZE) {
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return -1;
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}
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memcpy(buf, buffer_seed, MBEDTLS_ENTROPY_BLOCK_SIZE);
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return 0;
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}
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int buffer_nv_seed_write(unsigned char *buf, size_t buf_len)
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{
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if (buf_len != MBEDTLS_ENTROPY_BLOCK_SIZE) {
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return -1;
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}
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memcpy(buffer_seed, buf, MBEDTLS_ENTROPY_BLOCK_SIZE);
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return 0;
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}
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/*
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* NV seed read/write helpers that fill the base seedfile
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*/
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static int write_nv_seed(unsigned char *buf, size_t buf_len)
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{
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FILE *f;
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if (buf_len != MBEDTLS_ENTROPY_BLOCK_SIZE) {
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return -1;
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}
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if ((f = fopen(MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "w")) == NULL) {
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return -1;
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}
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if (fwrite(buf, 1, MBEDTLS_ENTROPY_BLOCK_SIZE, f) !=
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MBEDTLS_ENTROPY_BLOCK_SIZE) {
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return -1;
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}
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fclose(f);
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return 0;
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}
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int read_nv_seed(unsigned char *buf, size_t buf_len)
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{
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FILE *f;
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if (buf_len != MBEDTLS_ENTROPY_BLOCK_SIZE) {
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return -1;
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}
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if ((f = fopen(MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "rb")) == NULL) {
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return -1;
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}
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if (fread(buf, 1, MBEDTLS_ENTROPY_BLOCK_SIZE, f) !=
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MBEDTLS_ENTROPY_BLOCK_SIZE) {
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return -1;
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}
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fclose(f);
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return 0;
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}
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#endif /* MBEDTLS_ENTROPY_NV_SEED */
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/* END_HEADER */
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/* BEGIN_DEPENDENCIES
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* depends_on:MBEDTLS_ENTROPY_C
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* END_DEPENDENCIES
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*/
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/* BEGIN_CASE */
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void entropy_init_free(int reinit)
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{
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mbedtls_entropy_context ctx;
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/* Double free is not explicitly documented to work, but it is convenient
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* to call mbedtls_entropy_free() unconditionally on an error path without
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* checking whether it has already been called in the success path. */
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mbedtls_entropy_init(&ctx);
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mbedtls_entropy_free(&ctx);
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if (reinit) {
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mbedtls_entropy_init(&ctx);
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}
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mbedtls_entropy_free(&ctx);
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/* This test case always succeeds, functionally speaking. A plausible
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* bug might trigger an invalid pointer dereference or a memory leak. */
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goto exit;
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:MBEDTLS_ENTROPY_NV_SEED:MBEDTLS_FS_IO */
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void entropy_seed_file(char *path, int ret)
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{
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mbedtls_entropy_context ctx;
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mbedtls_entropy_init(&ctx);
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TEST_ASSERT(mbedtls_entropy_write_seed_file(&ctx, path) == ret);
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TEST_ASSERT(mbedtls_entropy_update_seed_file(&ctx, path) == ret);
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exit:
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mbedtls_entropy_free(&ctx);
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:MBEDTLS_ENTROPY_NV_SEED:MBEDTLS_FS_IO */
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void entropy_write_base_seed_file(int ret)
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{
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mbedtls_entropy_context ctx;
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mbedtls_entropy_init(&ctx);
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TEST_ASSERT(mbedtls_entropy_write_seed_file(&ctx, MBEDTLS_PLATFORM_STD_NV_SEED_FILE) == ret);
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TEST_ASSERT(mbedtls_entropy_update_seed_file(&ctx, MBEDTLS_PLATFORM_STD_NV_SEED_FILE) == ret);
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exit:
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mbedtls_entropy_free(&ctx);
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void entropy_no_sources()
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{
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mbedtls_entropy_context ctx;
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unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
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mbedtls_entropy_init(&ctx);
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entropy_clear_sources(&ctx);
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TEST_EQUAL(mbedtls_entropy_func(&ctx, buf, sizeof(buf)),
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MBEDTLS_ERR_ENTROPY_NO_SOURCES_DEFINED);
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exit:
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mbedtls_entropy_free(&ctx);
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void entropy_too_many_sources()
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{
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mbedtls_entropy_context ctx;
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size_t i;
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entropy_dummy_context dummy = { DUMMY_REQUESTED_LENGTH, 0, 0 };
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mbedtls_entropy_init(&ctx);
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/*
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* It's hard to tell precisely when the error will occur,
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* since we don't know how many sources were automatically added.
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*/
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for (i = 0; i < MBEDTLS_ENTROPY_MAX_SOURCES; i++) {
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(void) mbedtls_entropy_add_source(&ctx, entropy_dummy_source, &dummy,
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16, MBEDTLS_ENTROPY_SOURCE_WEAK);
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}
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TEST_ASSERT(mbedtls_entropy_add_source(&ctx, entropy_dummy_source, &dummy,
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16, MBEDTLS_ENTROPY_SOURCE_WEAK)
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== MBEDTLS_ERR_ENTROPY_MAX_SOURCES);
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exit:
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mbedtls_entropy_free(&ctx);
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:ENTROPY_HAVE_STRONG */
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void entropy_func_len(int len, int ret)
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{
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mbedtls_entropy_context ctx;
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unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE + 10] = { 0 };
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unsigned char acc[MBEDTLS_ENTROPY_BLOCK_SIZE + 10] = { 0 };
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size_t i, j;
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mbedtls_entropy_init(&ctx);
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/*
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* See comments in mbedtls_entropy_self_test()
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*/
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for (i = 0; i < 8; i++) {
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TEST_ASSERT(mbedtls_entropy_func(&ctx, buf, len) == ret);
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for (j = 0; j < sizeof(buf); j++) {
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acc[j] |= buf[j];
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}
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}
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if (ret == 0) {
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for (j = 0; j < (size_t) len; j++) {
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TEST_ASSERT(acc[j] != 0);
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}
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}
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for (j = len; j < sizeof(buf); j++) {
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TEST_ASSERT(acc[j] == 0);
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}
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exit:
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mbedtls_entropy_free(&ctx);
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void entropy_source_fail(char *path)
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{
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mbedtls_entropy_context ctx;
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unsigned char buf[16];
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entropy_dummy_context dummy = { DUMMY_FAIL, 0, 0 };
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mbedtls_entropy_init(&ctx);
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TEST_ASSERT(mbedtls_entropy_add_source(&ctx, entropy_dummy_source,
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&dummy, 16,
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MBEDTLS_ENTROPY_SOURCE_WEAK)
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== 0);
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TEST_ASSERT(mbedtls_entropy_func(&ctx, buf, sizeof(buf))
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== MBEDTLS_ERR_ENTROPY_SOURCE_FAILED);
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TEST_ASSERT(mbedtls_entropy_gather(&ctx)
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== MBEDTLS_ERR_ENTROPY_SOURCE_FAILED);
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#if defined(MBEDTLS_FS_IO) && defined(MBEDTLS_ENTROPY_NV_SEED)
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TEST_ASSERT(mbedtls_entropy_write_seed_file(&ctx, path)
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== MBEDTLS_ERR_ENTROPY_SOURCE_FAILED);
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TEST_ASSERT(mbedtls_entropy_update_seed_file(&ctx, path)
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== MBEDTLS_ERR_ENTROPY_SOURCE_FAILED);
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#else
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((void) path);
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#endif
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exit:
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mbedtls_entropy_free(&ctx);
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void entropy_threshold(int threshold, int chunk_size, int result)
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{
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mbedtls_entropy_context ctx;
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entropy_dummy_context strong =
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{ DUMMY_CONSTANT_LENGTH, MBEDTLS_ENTROPY_BLOCK_SIZE, 0 };
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entropy_dummy_context weak = { DUMMY_CONSTANT_LENGTH, chunk_size, 0 };
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unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE] = { 0 };
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int ret;
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mbedtls_entropy_init(&ctx);
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entropy_clear_sources(&ctx);
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/* Set strong source that reaches its threshold immediately and
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* a weak source whose threshold is a test parameter. */
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TEST_ASSERT(mbedtls_entropy_add_source(&ctx, entropy_dummy_source,
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&strong, 1,
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MBEDTLS_ENTROPY_SOURCE_STRONG) == 0);
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TEST_ASSERT(mbedtls_entropy_add_source(&ctx, entropy_dummy_source,
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&weak, threshold,
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MBEDTLS_ENTROPY_SOURCE_WEAK) == 0);
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ret = mbedtls_entropy_func(&ctx, buf, sizeof(buf));
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if (result >= 0) {
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TEST_ASSERT(ret == 0);
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#if defined(MBEDTLS_ENTROPY_NV_SEED)
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/* If the NV seed functionality is enabled, there are two entropy
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* updates: before and after updating the NV seed. */
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result *= 2;
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#endif
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TEST_ASSERT(weak.calls == (size_t) result);
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} else {
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TEST_ASSERT(ret == result);
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}
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exit:
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mbedtls_entropy_free(&ctx);
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void entropy_calls(int strength1, int strength2,
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int threshold, int chunk_size,
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int result)
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{
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/*
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* if result >= 0: result = expected number of calls to source 1
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* if result < 0: result = expected return code from mbedtls_entropy_func()
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*/
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mbedtls_entropy_context ctx;
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entropy_dummy_context dummy1 = { DUMMY_CONSTANT_LENGTH, chunk_size, 0 };
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entropy_dummy_context dummy2 = { DUMMY_CONSTANT_LENGTH, chunk_size, 0 };
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unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE] = { 0 };
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int ret;
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mbedtls_entropy_init(&ctx);
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entropy_clear_sources(&ctx);
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TEST_ASSERT(mbedtls_entropy_add_source(&ctx, entropy_dummy_source,
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&dummy1, threshold,
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strength1) == 0);
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TEST_ASSERT(mbedtls_entropy_add_source(&ctx, entropy_dummy_source,
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&dummy2, threshold,
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strength2) == 0);
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ret = mbedtls_entropy_func(&ctx, buf, sizeof(buf));
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if (result >= 0) {
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TEST_ASSERT(ret == 0);
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#if defined(MBEDTLS_ENTROPY_NV_SEED)
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/* If the NV seed functionality is enabled, there are two entropy
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* updates: before and after updating the NV seed. */
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result *= 2;
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#endif
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TEST_ASSERT(dummy1.calls == (size_t) result);
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} else {
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TEST_ASSERT(ret == result);
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}
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exit:
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mbedtls_entropy_free(&ctx);
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:MBEDTLS_ENTROPY_NV_SEED:MBEDTLS_FS_IO */
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void nv_seed_file_create()
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{
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unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
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memset(buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE);
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TEST_ASSERT(write_nv_seed(buf, MBEDTLS_ENTROPY_BLOCK_SIZE) == 0);
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:MBEDTLS_ENTROPY_NV_SEED:MBEDTLS_FS_IO:MBEDTLS_PLATFORM_NV_SEED_ALT */
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void entropy_nv_seed_std_io()
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{
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unsigned char io_seed[MBEDTLS_ENTROPY_BLOCK_SIZE];
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unsigned char check_seed[MBEDTLS_ENTROPY_BLOCK_SIZE];
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memset(io_seed, 1, MBEDTLS_ENTROPY_BLOCK_SIZE);
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memset(check_seed, 0, MBEDTLS_ENTROPY_BLOCK_SIZE);
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mbedtls_platform_set_nv_seed(mbedtls_platform_std_nv_seed_read,
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mbedtls_platform_std_nv_seed_write);
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/* Check if platform NV read and write manipulate the same data */
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TEST_ASSERT(write_nv_seed(io_seed, MBEDTLS_ENTROPY_BLOCK_SIZE) == 0);
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TEST_ASSERT(mbedtls_nv_seed_read(check_seed, MBEDTLS_ENTROPY_BLOCK_SIZE) ==
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MBEDTLS_ENTROPY_BLOCK_SIZE);
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TEST_ASSERT(memcmp(io_seed, check_seed, MBEDTLS_ENTROPY_BLOCK_SIZE) == 0);
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memset(check_seed, 0, MBEDTLS_ENTROPY_BLOCK_SIZE);
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/* Check if platform NV write and raw read manipulate the same data */
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TEST_ASSERT(mbedtls_nv_seed_write(io_seed, MBEDTLS_ENTROPY_BLOCK_SIZE) ==
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MBEDTLS_ENTROPY_BLOCK_SIZE);
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TEST_ASSERT(read_nv_seed(check_seed, MBEDTLS_ENTROPY_BLOCK_SIZE) == 0);
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TEST_ASSERT(memcmp(io_seed, check_seed, MBEDTLS_ENTROPY_BLOCK_SIZE) == 0);
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:MBEDTLS_MD_C:MBEDTLS_ENTROPY_NV_SEED:MBEDTLS_PLATFORM_NV_SEED_ALT */
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void entropy_nv_seed(data_t *read_seed)
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{
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#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
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const mbedtls_md_info_t *md_info =
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mbedtls_md_info_from_type(MBEDTLS_MD_SHA512);
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#elif defined(MBEDTLS_ENTROPY_SHA256_ACCUMULATOR)
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const mbedtls_md_info_t *md_info =
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mbedtls_md_info_from_type(MBEDTLS_MD_SHA256);
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#else
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#error "Unsupported entropy accumulator"
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#endif
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mbedtls_md_context_t accumulator;
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mbedtls_entropy_context ctx;
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int (*original_mbedtls_nv_seed_read)(unsigned char *buf, size_t buf_len) =
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mbedtls_nv_seed_read;
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int (*original_mbedtls_nv_seed_write)(unsigned char *buf, size_t buf_len) =
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mbedtls_nv_seed_write;
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unsigned char header[2];
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unsigned char entropy[MBEDTLS_ENTROPY_BLOCK_SIZE];
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unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
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unsigned char empty[MBEDTLS_ENTROPY_BLOCK_SIZE];
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unsigned char check_seed[MBEDTLS_ENTROPY_BLOCK_SIZE];
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unsigned char check_entropy[MBEDTLS_ENTROPY_BLOCK_SIZE];
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memset(entropy, 0, MBEDTLS_ENTROPY_BLOCK_SIZE);
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memset(buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE);
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memset(empty, 0, MBEDTLS_ENTROPY_BLOCK_SIZE);
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memset(check_seed, 2, MBEDTLS_ENTROPY_BLOCK_SIZE);
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memset(check_entropy, 3, MBEDTLS_ENTROPY_BLOCK_SIZE);
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// Make sure we read/write NV seed from our buffers
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mbedtls_platform_set_nv_seed(buffer_nv_seed_read, buffer_nv_seed_write);
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mbedtls_md_init(&accumulator);
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mbedtls_entropy_init(&ctx);
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entropy_clear_sources(&ctx);
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TEST_ASSERT(mbedtls_entropy_add_source(&ctx, mbedtls_nv_seed_poll, NULL,
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MBEDTLS_ENTROPY_BLOCK_SIZE,
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MBEDTLS_ENTROPY_SOURCE_STRONG) == 0);
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// Set the initial NV seed to read
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TEST_ASSERT(read_seed->len >= MBEDTLS_ENTROPY_BLOCK_SIZE);
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memcpy(buffer_seed, read_seed->x, MBEDTLS_ENTROPY_BLOCK_SIZE);
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// Do an entropy run
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TEST_ASSERT(mbedtls_entropy_func(&ctx, entropy, sizeof(entropy)) == 0);
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// Determine what should have happened with manual entropy internal logic
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// Init accumulator
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header[1] = MBEDTLS_ENTROPY_BLOCK_SIZE;
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TEST_ASSERT(mbedtls_md_setup(&accumulator, md_info, 0) == 0);
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// First run for updating write_seed
|
|
header[0] = 0;
|
|
TEST_ASSERT(mbedtls_md_starts(&accumulator) == 0);
|
|
TEST_ASSERT(mbedtls_md_update(&accumulator, header, 2) == 0);
|
|
TEST_ASSERT(mbedtls_md_update(&accumulator,
|
|
read_seed->x, MBEDTLS_ENTROPY_BLOCK_SIZE) == 0);
|
|
TEST_ASSERT(mbedtls_md_finish(&accumulator, buf) == 0);
|
|
|
|
TEST_ASSERT(mbedtls_md_starts(&accumulator) == 0);
|
|
TEST_ASSERT(mbedtls_md_update(&accumulator,
|
|
buf, MBEDTLS_ENTROPY_BLOCK_SIZE) == 0);
|
|
|
|
TEST_ASSERT(mbedtls_md(md_info, buf, MBEDTLS_ENTROPY_BLOCK_SIZE,
|
|
check_seed) == 0);
|
|
|
|
// Second run for actual entropy (triggers mbedtls_entropy_update_nv_seed)
|
|
header[0] = MBEDTLS_ENTROPY_SOURCE_MANUAL;
|
|
TEST_ASSERT(mbedtls_md_update(&accumulator, header, 2) == 0);
|
|
TEST_ASSERT(mbedtls_md_update(&accumulator,
|
|
empty, MBEDTLS_ENTROPY_BLOCK_SIZE) == 0);
|
|
|
|
header[0] = 0;
|
|
TEST_ASSERT(mbedtls_md_update(&accumulator, header, 2) == 0);
|
|
TEST_ASSERT(mbedtls_md_update(&accumulator,
|
|
check_seed, MBEDTLS_ENTROPY_BLOCK_SIZE) == 0);
|
|
TEST_ASSERT(mbedtls_md_finish(&accumulator, buf) == 0);
|
|
|
|
TEST_ASSERT(mbedtls_md(md_info, buf, MBEDTLS_ENTROPY_BLOCK_SIZE,
|
|
check_entropy) == 0);
|
|
|
|
// Check result of both NV file and entropy received with the manual calculations
|
|
TEST_ASSERT(memcmp(check_seed, buffer_seed, MBEDTLS_ENTROPY_BLOCK_SIZE) == 0);
|
|
TEST_ASSERT(memcmp(check_entropy, entropy, MBEDTLS_ENTROPY_BLOCK_SIZE) == 0);
|
|
|
|
exit:
|
|
mbedtls_md_free(&accumulator);
|
|
mbedtls_entropy_free(&ctx);
|
|
mbedtls_nv_seed_read = original_mbedtls_nv_seed_read;
|
|
mbedtls_nv_seed_write = original_mbedtls_nv_seed_write;
|
|
}
|
|
/* END_CASE */
|
|
|
|
/* BEGIN_CASE depends_on:ENTROPY_HAVE_STRONG:MBEDTLS_SELF_TEST */
|
|
void entropy_selftest(int result)
|
|
{
|
|
TEST_ASSERT(mbedtls_entropy_self_test(1) == result);
|
|
}
|
|
/* END_CASE */
|