Mercurial > dropbear

annotate fuzz/fuzzer-kexcurve25519.c @ 1786:a3b39df57c8b

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fuzz: add an always-failing dropbear_listen() replacement
author Matt Johnston <matt@ucc.asn.au>
date Sun, 06 Dec 2020 21:54:01 +0800
parents 0cc85b4a4abb
children
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Vladislav Grishenko <themiron@users.noreply.github.com>
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1 #include "fuzz.h"
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2 #include "session.h"
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3 #include "fuzz-wrapfd.h"
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4 #include "debug.h"
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5 #include "runopts.h"
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6 #include "algo.h"
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7 #include "bignum.h"
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8
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9 static struct key_context* keep_newkeys = NULL;
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10 /* An arbitrary limit */
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11 #define NUM_PARAMS 80
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12 static struct kex_curve25519_param *curve25519_params[NUM_PARAMS];
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13
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14 static void setup() __attribute__((constructor));
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15 // Perform initial setup here to avoid hitting timeouts on first run
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16 static void setup() {
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17 fuzz_common_setup();
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18 fuzz_svr_setup();
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19
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20 keep_newkeys = (struct key_context*)m_malloc(sizeof(struct key_context));
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21 keep_newkeys->algo_kex = fuzz_get_algo(sshkex, "curve25519-sha256");
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22 keep_newkeys->algo_hostkey = DROPBEAR_SIGNKEY_ED25519;
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23 ses.newkeys = keep_newkeys;
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24
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25 /* Pre-generate parameters */
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26 int i;
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27 for (i = 0; i < NUM_PARAMS; i++) {
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28 curve25519_params[i] = gen_kexcurve25519_param();
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29 }
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30 }
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31
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32 int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
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33 if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
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34 return 0;
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35 }
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36
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37 m_malloc_set_epoch(1);
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38
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39 if (setjmp(fuzz.jmp) == 0) {
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40 /* Based on recv_msg_kexdh_init()/send_msg_kexdh_reply()
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41 with DROPBEAR_KEX_CURVE25519 */
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42 ses.newkeys = keep_newkeys;
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43
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44 /* Choose from the collection of curve25519 params */
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45 unsigned int e = buf_getint(fuzz.input);
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46 struct kex_curve25519_param *curve25519_param = curve25519_params[e % NUM_PARAMS];
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47
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48 buffer * ecdh_qs = buf_getstringbuf(fuzz.input);
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49
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50 ses.kexhashbuf = buf_new(KEXHASHBUF_MAX_INTS);
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51 kexcurve25519_comb_key(curve25519_param, ecdh_qs, svr_opts.hostkey);
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52
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53 mp_clear(ses.dh_K);
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54 m_free(ses.dh_K);
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55 buf_free(ecdh_qs);
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56
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57 buf_free(ses.hash);
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58 buf_free(ses.session_id);
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59 /* kexhashbuf is freed in kexdh_comb_key */
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60
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61 m_malloc_free_epoch(1, 0);
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62 } else {
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63 m_malloc_free_epoch(1, 1);
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64 TRACE(("dropbear_exit longjmped"))
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65 /* dropbear_exit jumped here */
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66 }
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67
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68 return 0;
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69 }