Mercurial > dropbear

annotate fuzzer-kexcurve25519.c @ 1663:c795520269f9

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Fallback for key gen without hard link support (#89) Add a non-atomic fallback for key generation on platforms where link() is not permitted (such as most stock Android installs) or on filesystems without hard link support (such as FAT).
author Matt Robinson <git@nerdoftheherd.com>
date Sat, 14 Mar 2020 14:37:35 +0000
parents d32bcb5c557d
children
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1659
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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 int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
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10 static int once = 0;
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11 static struct key_context* keep_newkeys = NULL;
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12 /* number of generated parameters is limited by the timeout for the first run.
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13 TODO move this to the libfuzzer initialiser function instead if the timeout
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14 doesn't apply there */
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15 #define NUM_PARAMS 20
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16 static struct kex_curve25519_param *curve25519_params[NUM_PARAMS];
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17
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18 if (!once) {
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19 fuzz_common_setup();
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20 fuzz_svr_setup();
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21
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22 keep_newkeys = (struct key_context*)m_malloc(sizeof(struct key_context));
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23 keep_newkeys->algo_kex = fuzz_get_algo(sshkex, "curve25519-sha256");
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24 keep_newkeys->algo_hostkey = DROPBEAR_SIGNKEY_ED25519;
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25 ses.newkeys = keep_newkeys;
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26
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27 /* Pre-generate parameters */
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28 int i;
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29 for (i = 0; i < NUM_PARAMS; i++) {
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30 curve25519_params[i] = gen_kexcurve25519_param();
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31 }
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32
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33 once = 1;
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34 }
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35
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36 if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
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37 return 0;
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38 }
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39
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40 m_malloc_set_epoch(1);
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41
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42 if (setjmp(fuzz.jmp) == 0) {
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43 /* Based on recv_msg_kexdh_init()/send_msg_kexdh_reply()
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44 with DROPBEAR_KEX_CURVE25519 */
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45 ses.newkeys = keep_newkeys;
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46
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47 /* Choose from the collection of curve25519 params */
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48 unsigned int e = buf_getint(fuzz.input);
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49 struct kex_curve25519_param *curve25519_param = curve25519_params[e % NUM_PARAMS];
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50
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51 buffer * ecdh_qs = buf_getstringbuf(fuzz.input);
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52
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53 ses.kexhashbuf = buf_new(KEXHASHBUF_MAX_INTS);
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54 kexcurve25519_comb_key(curve25519_param, ecdh_qs, svr_opts.hostkey);
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55
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56 mp_clear(ses.dh_K);
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57 m_free(ses.dh_K);
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58 buf_free(ecdh_qs);
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59
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60 buf_free(ses.hash);
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61 buf_free(ses.session_id);
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62 /* kexhashbuf is freed in kexdh_comb_key */
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63
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64 m_malloc_free_epoch(1, 0);
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65 } else {
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66 m_malloc_free_epoch(1, 1);
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67 TRACE(("dropbear_exit longjmped"))
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68 /* dropbear_exit jumped here */
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69 }
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70
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71 return 0;
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72 }