Mercurial > dropbear

annotate fuzzer-kexcurve25519.c @ 1671:5c8913b7464c

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Mention Ed25519 in dropbearkey man (#94)
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 25 May 2020 18:28:27 +0500
parents d32bcb5c557d
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1659
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
1 #include "fuzz.h"
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
2 #include "session.h"
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
3 #include "fuzz-wrapfd.h"
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
4 #include "debug.h"
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
5 #include "runopts.h"
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
6 #include "algo.h"
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
7 #include "bignum.h"
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
8
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
9 int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
10 static int once = 0;
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
11 static struct key_context* keep_newkeys = NULL;
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
12 /* number of generated parameters is limited by the timeout for the first run.
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
13 TODO move this to the libfuzzer initialiser function instead if the timeout
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
14 doesn't apply there */
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
15 #define NUM_PARAMS 20
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
16 static struct kex_curve25519_param *curve25519_params[NUM_PARAMS];
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
17
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
18 if (!once) {
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
19 fuzz_common_setup();
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
20 fuzz_svr_setup();
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
21
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
22 keep_newkeys = (struct key_context*)m_malloc(sizeof(struct key_context));
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
23 keep_newkeys->algo_kex = fuzz_get_algo(sshkex, "curve25519-sha256");
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
24 keep_newkeys->algo_hostkey = DROPBEAR_SIGNKEY_ED25519;
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
25 ses.newkeys = keep_newkeys;
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
26
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
27 /* Pre-generate parameters */
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
28 int i;
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
29 for (i = 0; i < NUM_PARAMS; i++) {
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
30 curve25519_params[i] = gen_kexcurve25519_param();
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
31 }
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
32
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
33 once = 1;
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
34 }
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
35
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
36 if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
37 return 0;
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
38 }
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
39
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
40 m_malloc_set_epoch(1);
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
41
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
42 if (setjmp(fuzz.jmp) == 0) {
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
43 /* Based on recv_msg_kexdh_init()/send_msg_kexdh_reply()
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
44 with DROPBEAR_KEX_CURVE25519 */
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
45 ses.newkeys = keep_newkeys;
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
46
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
47 /* Choose from the collection of curve25519 params */
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
48 unsigned int e = buf_getint(fuzz.input);
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
49 struct kex_curve25519_param *curve25519_param = curve25519_params[e % NUM_PARAMS];
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
50
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
51 buffer * ecdh_qs = buf_getstringbuf(fuzz.input);
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
52
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
53 ses.kexhashbuf = buf_new(KEXHASHBUF_MAX_INTS);
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
54 kexcurve25519_comb_key(curve25519_param, ecdh_qs, svr_opts.hostkey);
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
55
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
56 mp_clear(ses.dh_K);
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
57 m_free(ses.dh_K);
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
58 buf_free(ecdh_qs);
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
59
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
60 buf_free(ses.hash);
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
61 buf_free(ses.session_id);
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
62 /* kexhashbuf is freed in kexdh_comb_key */
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
63
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
64 m_malloc_free_epoch(1, 0);
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
65 } else {
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
66 m_malloc_free_epoch(1, 1);
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
67 TRACE(("dropbear_exit longjmped"))
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
68 /* dropbear_exit jumped here */
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
69 }
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
70
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
71 return 0;
d32bcb5c557d Add Ed25519 support (#91)
Vladislav Grishenko <themiron@users.noreply.github.com>
parents:
diff changeset
72 }