annotate fuzzer-kexecdh.c @ 1589:35af85194268

Add kexdh and kexecdh fuzzers
author Matt Johnston <matt@ucc.asn.au>
date Mon, 05 Mar 2018 11:50:31 +0800
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children 46506b32650a
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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 const struct dropbear_kex *ecdh[3]; /* 256, 384, 521 */
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12 static struct key_context* keep_newkeys = NULL;
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13 #define NUM_PARAMS 800
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14 static struct kex_ecdh_param *ecdh_params[NUM_PARAMS];
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15
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16 if (!once) {
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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 /* ses gets zeroed by fuzz_set_input */
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21 keep_newkeys = (struct key_context*)m_malloc(sizeof(struct key_context));
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22 ecdh[0] = fuzz_get_algo(sshkex, "ecdh-sha2-nistp256");
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23 ecdh[1] = fuzz_get_algo(sshkex, "ecdh-sha2-nistp384");
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24 ecdh[2] = fuzz_get_algo(sshkex, "ecdh-sha2-nistp521");
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25 assert(ecdh[0]);
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26 assert(ecdh[1]);
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27 assert(ecdh[2]);
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28 keep_newkeys->algo_hostkey = DROPBEAR_SIGNKEY_ECDSA_NISTP256;
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29 ses.newkeys = keep_newkeys;
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30
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31 /* Pre-generate parameters */
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32 int i;
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33 for (i = 0; i < NUM_PARAMS; i++) {
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34 ses.newkeys->algo_kex = ecdh[i % 3];
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35 ecdh_params[i] = gen_kexecdh_param();
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36 }
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37
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38 once = 1;
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39 }
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40
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41 if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
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42 return 0;
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43 }
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44
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45 m_malloc_set_epoch(1);
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46
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47 if (setjmp(fuzz.jmp) == 0) {
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48 /* Based on recv_msg_kexdh_init()/send_msg_kexdh_reply()
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49 with DROPBEAR_KEX_ECDH */
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50 ses.newkeys = keep_newkeys;
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51
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52 /* random choice of ecdh 256, 384, 521 */
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53 unsigned char b = buf_getbyte(fuzz.input);
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54 ses.newkeys->algo_kex = ecdh[b % 3];
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55
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56 /* Choose from the collection of ecdh params */
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57 unsigned int e = buf_getint(fuzz.input);
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58 struct kex_ecdh_param *ecdh_param = ecdh_params[e % NUM_PARAMS];
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59
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60 buffer * ecdh_qs = buf_getstringbuf(fuzz.input);
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61
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62 ses.kexhashbuf = buf_new(4);
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63 buf_putint(ses.kexhashbuf, 12345);
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64 kexecdh_comb_key(ecdh_param, ecdh_qs, svr_opts.hostkey);
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65
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66 /* kexhashbuf is freed in kexdh_comb_key */
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67 m_free(ses.dh_K);
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68 buf_free(ecdh_qs);
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69
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70 m_malloc_free_epoch(1, 0);
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71 } else {
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72 m_malloc_free_epoch(1, 1);
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73 TRACE(("dropbear_exit longjmped"))
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74 /* dropbear_exit jumped here */
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75 }
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76
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77 return 0;
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78 }