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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 #define NUM_PARAMS 800 |
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13 static struct kex_dh_param *dh_params[NUM_PARAMS]; |
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14 |
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15 if (!once) { |
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16 fuzz_common_setup(); |
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17 fuzz_svr_setup(); |
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18 |
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19 keep_newkeys = (struct key_context*)m_malloc(sizeof(struct key_context)); |
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20 keep_newkeys->algo_kex = fuzz_get_algo(sshkex, "diffie-hellman-group14-sha256"); |
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21 keep_newkeys->algo_hostkey = DROPBEAR_SIGNKEY_ECDSA_NISTP256; |
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22 ses.newkeys = keep_newkeys; |
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23 |
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24 /* Pre-generate parameters */ |
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25 int i; |
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26 for (i = 0; i < NUM_PARAMS; i++) { |
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27 dh_params[i] = gen_kexdh_param(); |
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28 } |
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29 |
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30 once = 1; |
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31 } |
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32 |
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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_NORMAL_DH */ |
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42 ses.newkeys = keep_newkeys; |
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43 |
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44 /* Choose from the collection of ecdh params */ |
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45 unsigned int e = buf_getint(fuzz.input); |
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46 struct kex_dh_param * dh_param = dh_params[e % NUM_PARAMS]; |
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47 |
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48 DEF_MP_INT(dh_e); |
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49 m_mp_init(&dh_e); |
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50 if (buf_getmpint(fuzz.input, &dh_e) != DROPBEAR_SUCCESS) { |
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51 dropbear_exit("Bad kex value"); |
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52 } |
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53 |
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54 ses.kexhashbuf = buf_new(4); |
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55 buf_putint(ses.kexhashbuf, 12345); |
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56 kexdh_comb_key(dh_param, &dh_e, svr_opts.hostkey); |
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57 |
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58 /* kexhashbuf is freed in kexdh_comb_key */ |
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59 m_free(ses.dh_K); |
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60 mp_clear(&dh_e); |
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61 |
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62 m_malloc_free_epoch(1, 0); |
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63 } else { |
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64 m_malloc_free_epoch(1, 1); |
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65 TRACE(("dropbear_exit longjmped")) |
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66 /* dropbear_exit jumped here */ |
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67 } |
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68 |
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69 return 0; |
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70 } |
