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65 lines
1.6 KiB
65 lines
1.6 KiB
#include "fuzz.h"
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#include "session.h"
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#include "fuzz-wrapfd.h"
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#include "debug.h"
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static void setup_fuzzer(void) {
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fuzz_common_setup();
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}
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static buffer *verifydata;
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/* Tests reading a public key and verifying a signature */
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int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
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static int once = 0;
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if (!once) {
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setup_fuzzer();
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verifydata = buf_new(30);
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buf_putstring(verifydata, "x", 1);
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once = 1;
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}
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if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
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return 0;
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}
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m_malloc_set_epoch(1);
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if (setjmp(fuzz.jmp) == 0) {
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sign_key *key = new_sign_key();
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enum signkey_type type = DROPBEAR_SIGNKEY_ANY;
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if (buf_get_pub_key(fuzz.input, key, &type) == DROPBEAR_SUCCESS) {
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if (buf_verify(fuzz.input, key, verifydata) == DROPBEAR_SUCCESS) {
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/* The fuzzer is capable of generating keys with a signature to match.
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We don't want false positives if the key is bogus, since a client/server
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wouldn't be trusting a bogus key anyway */
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int boguskey = 0;
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if (type == DROPBEAR_SIGNKEY_DSS) {
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/* So far have seen dss keys with bad p/q/g domain parameters */
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int pprime, qprime;
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assert(mp_prime_is_prime(key->dsskey->p, 5, &pprime) == MP_OKAY);
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assert(mp_prime_is_prime(key->dsskey->q, 18, &qprime) == MP_OKAY);
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boguskey = !(pprime && qprime);
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/* Could also check g**q mod p == 1 */
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}
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if (!boguskey) {
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printf("Random key/signature managed to verify!\n");
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abort();
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}
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}
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}
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sign_key_free(key);
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m_malloc_free_epoch(1, 0);
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} else {
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m_malloc_free_epoch(1, 1);
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TRACE(("dropbear_exit longjmped"))
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/* dropbear_exit jumped here */
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}
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return 0;
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}
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