Mercurial > dropbear
annotate fuzzer-kexdh.c @ 1659:d32bcb5c557d
Add Ed25519 support (#91)
* Add support for Ed25519 as a public key type
Ed25519 is a elliptic curve signature scheme that offers
better security than ECDSA and DSA and good performance. It may be
used for both user and host keys.
OpenSSH key import and fuzzer are not supported yet.
Initially inspired by Peter Szabo.
* Add curve25519 and ed25519 fuzzers
* Add import and export of Ed25519 keys
| author | Vladislav Grishenko <themiron@users.noreply.github.com> |
|---|---|
| date | Wed, 11 Mar 2020 21:09:45 +0500 |
| parents | a57822db3eac |
| children |
| rev | line source |
|---|---|
| 1589 | 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; | |
|
1601
b711a8256919
reduce fuzzer-kexdh params count again, still hitting timeout
Matt Johnston <matt@ucc.asn.au>
parents:
1595
diff
changeset
|
12 /* number of generated parameters is limited by the timeout for the first run. |
|
b711a8256919
reduce fuzzer-kexdh params count again, still hitting timeout
Matt Johnston <matt@ucc.asn.au>
parents:
1595
diff
changeset
|
13 TODO move this to the libfuzzer initialiser function instead if the timeout |
|
b711a8256919
reduce fuzzer-kexdh params count again, still hitting timeout
Matt Johnston <matt@ucc.asn.au>
parents:
1595
diff
changeset
|
14 doesn't apply there */ |
|
b711a8256919
reduce fuzzer-kexdh params count again, still hitting timeout
Matt Johnston <matt@ucc.asn.au>
parents:
1595
diff
changeset
|
15 #define NUM_PARAMS 20 |
| 1589 | 16 static struct kex_dh_param *dh_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, "diffie-hellman-group14-sha256"); | |
| 24 keep_newkeys->algo_hostkey = DROPBEAR_SIGNKEY_ECDSA_NISTP256; | |
| 25 ses.newkeys = keep_newkeys; | |
| 26 | |
| 27 /* Pre-generate parameters */ | |
| 28 int i; | |
| 29 for (i = 0; i < NUM_PARAMS; i++) { | |
| 30 dh_params[i] = gen_kexdh_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_NORMAL_DH */ | |
| 45 ses.newkeys = keep_newkeys; | |
| 46 | |
| 47 /* Choose from the collection of ecdh params */ | |
| 48 unsigned int e = buf_getint(fuzz.input); | |
| 49 struct kex_dh_param * dh_param = dh_params[e % NUM_PARAMS]; | |
| 50 | |
| 51 DEF_MP_INT(dh_e); | |
| 52 m_mp_init(&dh_e); | |
| 53 if (buf_getmpint(fuzz.input, &dh_e) != DROPBEAR_SUCCESS) { | |
| 54 dropbear_exit("Bad kex value"); | |
| 55 } | |
| 56 | |
|
1606
98d2b125eb89
kexhashbuf was much to small in kex fuzzers
Matt Johnston <matt@ucc.asn.au>
parents:
1601
diff
changeset
|
57 ses.kexhashbuf = buf_new(KEXHASHBUF_MAX_INTS); |
| 1589 | 58 kexdh_comb_key(dh_param, &dh_e, svr_opts.hostkey); |
| 59 | |
| 1609 | 60 mp_clear(ses.dh_K); |
| 1589 | 61 m_free(ses.dh_K); |
| 62 mp_clear(&dh_e); | |
| 63 | |
| 1609 | 64 buf_free(ses.hash); |
| 65 buf_free(ses.session_id); | |
| 66 /* kexhashbuf is freed in kexdh_comb_key */ | |
| 67 | |
| 1589 | 68 m_malloc_free_epoch(1, 0); |
| 69 } else { | |
| 70 m_malloc_free_epoch(1, 1); | |
| 71 TRACE(("dropbear_exit longjmped")) | |
| 72 /* dropbear_exit jumped here */ | |
| 73 } | |
| 74 | |
| 75 return 0; | |
| 76 } |