dropbear/fuzzer-pubkey.c

#include "fuzz.h"
#include "session.h"
#include "fuzz-wrapfd.h"
#include "debug.h"

static void setup_fuzzer(void) {
	common_setup_fuzzer();
}

int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
	static int once = 0;
	if (!once) {
		setup_fuzzer();
		once = 1;
	}

	m_malloc_set_epoch(1);

    fuzz_seed();
    fuzz.input->data = (unsigned char*)Data;
    fuzz.input->len = Size;
    fuzz.input->size = Size;
    fuzz.input->pos = 0;

    if (Size < 4) {
    	return 0;
    }

    // choose a keytype based on input
    uint8_t b = 0;
    size_t i;
    for (i = 0; i < Size; i++) {
    	b ^= Data[i];
    }
    const char* algoname = fuzz_signkey_names[b%DROPBEAR_SIGNKEY_NUM_NAMED];
    const char* keyblob = "fakekeyblob";

	if (setjmp(fuzz.jmp) == 0) {
		fuzz_checkpubkey_line(fuzz.input, 5, "/home/me/authorized_keys", 
			algoname, strlen(algoname),
			keyblob, strlen(keyblob));
	} else {
		m_malloc_free_epoch(1);
		TRACE(("dropbear_exit longjmped"))
		// dropbear_exit jumped here
	}

	return 0;
}