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comparison fuzz/fuzzer-kexcurve25519.c @ 1756:d5680e12ac33

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Move fuzzing code to fuzz/ subdirectory, improve Makefile.in
author Matt Johnston <matt@ucc.asn.au>
date Fri, 23 Oct 2020 23:10:20 +0800
parents fuzzer-kexcurve25519.c@d32bcb5c557d
children 0cc85b4a4abb
comparison
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1753:7c0fcd19e492 1756:d5680e12ac33
1 #include "fuzz.h"
2 #include "session.h"
3 #include "fuzz-wrapfd.h"
4 #include "debug.h"
5 #include "runopts.h"
6 #include "algo.h"
7 #include "bignum.h"
8
9 int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
10 static int once = 0;
11 static struct key_context* keep_newkeys = NULL;
12 /* number of generated parameters is limited by the timeout for the first run.
13 TODO move this to the libfuzzer initialiser function instead if the timeout
14 doesn't apply there */
15 #define NUM_PARAMS 20
16 static struct kex_curve25519_param *curve25519_params[NUM_PARAMS];
17
18 if (!once) {
19 fuzz_common_setup();
20 fuzz_svr_setup();
21
22 keep_newkeys = (struct key_context*)m_malloc(sizeof(struct key_context));
23 keep_newkeys->algo_kex = fuzz_get_algo(sshkex, "curve25519-sha256");
24 keep_newkeys->algo_hostkey = DROPBEAR_SIGNKEY_ED25519;
25 ses.newkeys = keep_newkeys;
26
27 /* Pre-generate parameters */
28 int i;
29 for (i = 0; i < NUM_PARAMS; i++) {
30 curve25519_params[i] = gen_kexcurve25519_param();
31 }
32
33 once = 1;
34 }
35
36 if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
37 return 0;
38 }
39
40 m_malloc_set_epoch(1);
41
42 if (setjmp(fuzz.jmp) == 0) {
43 /* Based on recv_msg_kexdh_init()/send_msg_kexdh_reply()
44 with DROPBEAR_KEX_CURVE25519 */
45 ses.newkeys = keep_newkeys;
46
47 /* Choose from the collection of curve25519 params */
48 unsigned int e = buf_getint(fuzz.input);
49 struct kex_curve25519_param *curve25519_param = curve25519_params[e % NUM_PARAMS];
50
51 buffer * ecdh_qs = buf_getstringbuf(fuzz.input);
52
53 ses.kexhashbuf = buf_new(KEXHASHBUF_MAX_INTS);
54 kexcurve25519_comb_key(curve25519_param, ecdh_qs, svr_opts.hostkey);
55
56 mp_clear(ses.dh_K);
57 m_free(ses.dh_K);
58 buf_free(ecdh_qs);
59
60 buf_free(ses.hash);
61 buf_free(ses.session_id);
62 /* kexhashbuf is freed in kexdh_comb_key */
63
64 m_malloc_free_epoch(1, 0);
65 } else {
66 m_malloc_free_epoch(1, 1);
67 TRACE(("dropbear_exit longjmped"))
68 /* dropbear_exit jumped here */
69 }
70
71 return 0;
72 }