401 lines
9.7 KiB
C
401 lines
9.7 KiB
C
/* Test program to verify that RSA signing is thread-safe in OpenSSL. */
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <openssl/crypto.h>
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#include <openssl/err.h>
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#include <openssl/objects.h>
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#include <openssl/rand.h>
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#include <openssl/rsa.h>
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#include <openssl/md5.h>
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#include <openssl/ssl.h>
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/* Just assume we want to do engine stuff if we're using 0.9.6b or
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* higher. This assumption is only valid for versions bundled with RHL. */
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#if OPENSSL_VERSION_NUMBER >= 0x0090602fL
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#include <openssl/engine.h>
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#define USE_ENGINE
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#endif
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#define MAX_THREAD_COUNT 10000
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#define ITERATION_COUNT 10
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#define MAIN_COUNT 100
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/* OpenSSL requires us to provide thread ID and locking primitives. */
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pthread_mutex_t *mutex_locks = NULL;
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static unsigned long
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thread_id_cb(void)
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{
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return (unsigned long) pthread_self();
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}
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static void
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lock_cb(int mode, int n, const char *file, int line)
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{
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if (mode & CRYPTO_LOCK) {
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pthread_mutex_lock(&mutex_locks[n]);
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} else {
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pthread_mutex_unlock(&mutex_locks[n]);
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}
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}
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struct thread_args {
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RSA *rsa;
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int digest_type;
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unsigned char *digest;
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unsigned int digest_len;
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unsigned char *signature;
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unsigned int signature_len;
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pthread_t main_thread;
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};
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static int print = 0;
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pthread_mutex_t sign_lock = PTHREAD_MUTEX_INITIALIZER;
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static int locked_sign = 0;
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static void SIGN_LOCK() {if (locked_sign) pthread_mutex_lock(&sign_lock);}
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static void SIGN_UNLOCK() {if (locked_sign) pthread_mutex_unlock(&sign_lock);}
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pthread_mutex_t verify_lock = PTHREAD_MUTEX_INITIALIZER;
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static int locked_verify = 0;
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static void VERIFY_LOCK() {if (locked_verify) pthread_mutex_lock(&verify_lock);}
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static void VERIFY_UNLOCK() {if (locked_verify) pthread_mutex_unlock(&verify_lock);}
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pthread_mutex_t failure_count_lock = PTHREAD_MUTEX_INITIALIZER;
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long failure_count = 0;
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static void
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failure()
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{
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pthread_mutex_lock(&failure_count_lock);
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failure_count++;
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pthread_mutex_unlock(&failure_count_lock);
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}
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static void *
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thread_main(void *argp)
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{
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struct thread_args *args = argp;
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unsigned char *signature;
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unsigned int signature_len, signature_alloc_len;
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int ret, i;
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signature_alloc_len = args->signature_len;
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if (RSA_size(args->rsa) > signature_alloc_len) {
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signature_alloc_len = RSA_size(args->rsa);
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}
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signature = malloc(signature_alloc_len);
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if (signature == NULL) {
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fprintf(stderr, "Skipping checks in thread %lu -- %s.\n",
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(unsigned long) pthread_self(), strerror(errno));
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pthread_exit(0);
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return NULL;
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}
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for (i = 0; i < ITERATION_COUNT; i++) {
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signature_len = signature_alloc_len;
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SIGN_LOCK();
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ret = RSA_check_key(args->rsa);
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ERR_print_errors_fp(stdout);
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if (ret != 1) {
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failure();
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break;
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}
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ret = RSA_sign(args->digest_type,
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args->digest,
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args->digest_len,
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signature, &signature_len,
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args->rsa);
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SIGN_UNLOCK();
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ERR_print_errors_fp(stdout);
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if (ret != 1) {
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failure();
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break;
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}
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VERIFY_LOCK();
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ret = RSA_verify(args->digest_type,
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args->digest,
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args->digest_len,
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signature, signature_len,
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args->rsa);
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VERIFY_UNLOCK();
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if (ret != 1) {
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fprintf(stderr,
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"Signature from thread %lu(%d) fails "
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"verification (passed in thread #%lu)!\n",
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(long) pthread_self(), i,
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(long) args->main_thread);
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ERR_print_errors_fp(stdout);
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failure();
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continue;
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}
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if (print) {
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fprintf(stderr, ">%d\n", i);
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}
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}
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free(signature);
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pthread_exit(0);
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return NULL;
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}
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unsigned char *
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xmemdup(unsigned char *s, size_t len)
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{
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unsigned char *r;
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r = malloc(len);
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if (r == NULL) {
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fprintf(stderr, "Out of memory.\n");
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ERR_print_errors_fp(stdout);
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assert(r != NULL);
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}
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memcpy(r, s, len);
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return r;
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}
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int
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main(int argc, char **argv)
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{
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RSA *rsa;
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MD5_CTX md5;
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int fd, i;
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pthread_t threads[MAX_THREAD_COUNT];
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int thread_count = 1000;
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unsigned char *message, *digest;
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unsigned int message_len, digest_len;
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unsigned char *correct_signature;
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unsigned int correct_siglen, ret;
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struct thread_args master_args, *args;
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int sync = 0, seed = 0;
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int again = 1;
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#ifdef USE_ENGINE
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char *engine = NULL;
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ENGINE *e = NULL;
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#endif
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pthread_mutex_init(&failure_count_lock, NULL);
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for (i = 1; i < argc; i++) {
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if (strcmp(argv[i], "--seed") == 0) {
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printf("Seeding PRNG.\n");
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seed++;
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} else
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if (strcmp(argv[i], "--sync") == 0) {
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printf("Running synchronized.\n");
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sync++;
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} else
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if ((strcmp(argv[i], "--threads") == 0) && (i < argc - 1)) {
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i++;
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thread_count = atol(argv[i]);
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if (thread_count > MAX_THREAD_COUNT) {
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thread_count = MAX_THREAD_COUNT;
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}
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printf("Starting %d threads.\n", thread_count);
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sync++;
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} else
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if (strcmp(argv[i], "--sign") == 0) {
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printf("Locking signing.\n");
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locked_sign++;
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} else
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if (strcmp(argv[i], "--verify") == 0) {
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printf("Locking verifies.\n");
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locked_verify++;
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} else
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if (strcmp(argv[i], "--print") == 0) {
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printf("Tracing.\n");
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print++;
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#ifdef USE_ENGINE
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} else
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if ((strcmp(argv[i], "--engine") == 0) && (i < argc - 1)) {
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printf("Using engine \"%s\".\n", argv[i + 1]);
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engine = argv[i + 1];
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i++;
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#endif
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} else {
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printf("Bad argument: %s\n", argv[i]);
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return 1;
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}
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}
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/* Get some random data to sign. */
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fd = open("/dev/urandom", O_RDONLY);
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if (fd == -1) {
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fprintf(stderr, "Error opening /dev/urandom: %s\n",
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strerror(errno));
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}
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if (print) {
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fprintf(stderr, "Reading random data.\n");
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}
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message = malloc(message_len = 9371);
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read(fd, message, message_len);
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close(fd);
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/* Initialize the SSL library and set up thread-safe locking. */
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ERR_load_crypto_strings();
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SSL_library_init();
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mutex_locks = malloc(sizeof(pthread_mutex_t) * CRYPTO_num_locks());
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for (i = 0; i < CRYPTO_num_locks(); i++) {
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pthread_mutex_init(&mutex_locks[i], NULL);
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}
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CRYPTO_set_id_callback(thread_id_cb);
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CRYPTO_set_locking_callback(lock_cb);
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ERR_print_errors_fp(stdout);
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/* Seed the PRNG if we were asked to do so. */
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if (seed) {
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if (print) {
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fprintf(stderr, "Seeding PRNG.\n");
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}
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RAND_add(message, message_len, message_len);
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ERR_print_errors_fp(stdout);
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}
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/* Turn on a hardware crypto device if asked to do so. */
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#ifdef USE_ENGINE
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if (engine) {
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#if OPENSSL_VERSION_NUMBER >= 0x0090700fL
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ENGINE_load_builtin_engines();
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#endif
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if (print) {
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fprintf(stderr, "Initializing \"%s\" engine.\n",
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engine);
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}
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e = ENGINE_by_id(engine);
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ERR_print_errors_fp(stdout);
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if (e) {
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i = ENGINE_init(e);
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ERR_print_errors_fp(stdout);
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i = ENGINE_set_default_RSA(e);
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ERR_print_errors_fp(stdout);
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}
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}
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#endif
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/* Compute the digest for the signature. */
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if (print) {
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fprintf(stderr, "Computing digest.\n");
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}
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digest = malloc(digest_len = MD5_DIGEST_LENGTH);
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MD5_Init(&md5);
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MD5_Update(&md5, message, message_len);
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MD5_Final(digest, &md5);
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/* Generate a signing key. */
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if (print) {
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fprintf(stderr, "Generating key.\n");
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}
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rsa = RSA_generate_key(4096, 3, NULL, NULL);
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ERR_print_errors_fp(stdout);
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if (rsa == NULL) {
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_exit(1);
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}
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/* Sign the data. */
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correct_siglen = RSA_size(rsa);
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correct_signature = malloc(correct_siglen);
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for (i = 0; i < MAIN_COUNT; i++) {
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if (print) {
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fprintf(stderr, "Signing data (%d).\n", i);
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}
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ret = RSA_check_key(rsa);
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ERR_print_errors_fp(stdout);
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if (ret != 1) {
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failure();
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}
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correct_siglen = RSA_size(rsa);
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ret = RSA_sign(NID_md5, digest, digest_len,
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correct_signature, &correct_siglen,
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rsa);
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ERR_print_errors_fp(stdout);
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if (ret != 1) {
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_exit(2);
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}
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if (print) {
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fprintf(stderr, "Verifying data (%d).\n", i);
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}
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ret = RSA_verify(NID_md5, digest, digest_len,
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correct_signature, correct_siglen,
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rsa);
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if (ret != 1) {
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_exit(2);
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}
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}
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/* Collect up the inforamtion which other threads will need for
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* comparing their signature results with ours. */
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master_args.rsa = rsa;
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master_args.digest_type = NID_md5;
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master_args.digest = digest;
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master_args.digest_len = digest_len;
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master_args.signature = correct_signature;
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master_args.signature_len = correct_siglen;
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master_args.main_thread = pthread_self();
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fprintf(stdout, "Performing %d signatures in each of %d threads "
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"(%d, %d).\n", ITERATION_COUNT, thread_count,
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digest_len, correct_siglen);
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fflush(NULL);
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/* Start up all of the threads. */
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for (i = 0; i < thread_count; i++) {
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args = malloc(sizeof(struct thread_args));
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args->rsa = RSAPrivateKey_dup(master_args.rsa);
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args->digest_type = master_args.digest_type;
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args->digest_len = master_args.digest_len;
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args->digest = xmemdup(master_args.digest, args->digest_len);
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args->signature_len = master_args.signature_len;
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args->signature = xmemdup(master_args.signature,
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args->signature_len);
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args->main_thread = pthread_self();
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ret = pthread_create(&threads[i], NULL, thread_main, args);
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while ((ret != 0) && (errno == EAGAIN)) {
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ret = pthread_create(&threads[i], NULL,
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thread_main, &args);
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fprintf(stderr, "Thread limit hit at %d.\n", i);
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}
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if (ret != 0) {
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fprintf(stderr, "Unable to create thread %d: %s.\n",
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i, strerror(errno));
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threads[i] = -1;
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} else {
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if (sync) {
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ret = pthread_join(threads[i], NULL);
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assert(ret == 0);
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}
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if (print) {
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fprintf(stderr, "%d\n", i);
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}
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}
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}
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/* Wait for all threads to complete. So long as we can find an
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* unjoined thread, keep joining threads. */
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do {
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again = 0;
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for (i = 0; i < thread_count; i++) {
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/* If we have an unterminated thread, join it. */
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if (threads[i] != -1) {
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again = 1;
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if (print) {
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fprintf(stderr, "Joining thread %d.\n",
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i);
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}
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pthread_join(threads[i], NULL);
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threads[i] = -1;
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break;
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}
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}
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} while (again == 1);
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fprintf(stderr, "%ld failures\n", failure_count);
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return (failure_count != 0);
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}
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