Mercurial > dropbear
annotate fuzz/fuzzer-kexecdh.c @ 1772:0cc85b4a4abb
Move fuzzer-kex initialisation into a constructor function
Hopefully this can avoid hitting AFL timeouts
https://github.com/google/oss-fuzz/pull/2474
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Thu, 29 Oct 2020 23:00:52 +0800 |
| parents | d5680e12ac33 |
| 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 | |
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Move fuzzer-kex initialisation into a constructor function
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9 static const struct dropbear_kex *ecdh[3]; /* 256, 384, 521 */ |
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10 static struct key_context* keep_newkeys = NULL; |
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11 /* number of generated parameters. An arbitrary limit, but will delay startup */ |
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12 #define NUM_PARAMS 80 |
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13 static struct kex_ecdh_param *ecdh_params[NUM_PARAMS]; |
| 1589 | 14 |
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15 static void setup() __attribute__((constructor)); |
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16 // Perform initial setup here to avoid hitting timeouts on first run |
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17 static void setup() { |
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18 fuzz_common_setup(); |
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19 fuzz_svr_setup(); |
| 1589 | 20 |
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21 /* ses gets zeroed by fuzz_set_input */ |
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22 keep_newkeys = (struct key_context*)m_malloc(sizeof(struct key_context)); |
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23 ecdh[0] = fuzz_get_algo(sshkex, "ecdh-sha2-nistp256"); |
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24 ecdh[1] = fuzz_get_algo(sshkex, "ecdh-sha2-nistp384"); |
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25 ecdh[2] = fuzz_get_algo(sshkex, "ecdh-sha2-nistp521"); |
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26 assert(ecdh[0]); |
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27 assert(ecdh[1]); |
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28 assert(ecdh[2]); |
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29 keep_newkeys->algo_hostkey = DROPBEAR_SIGNKEY_ECDSA_NISTP256; |
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30 ses.newkeys = keep_newkeys; |
| 1589 | 31 |
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32 /* Pre-generate parameters */ |
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33 int i; |
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34 for (i = 0; i < NUM_PARAMS; i++) { |
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35 ses.newkeys->algo_kex = ecdh[i % 3]; |
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36 ecdh_params[i] = gen_kexecdh_param(); |
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37 } |
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38 } |
| 1589 | 39 |
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40 int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) { |
| 1589 | 41 |
| 42 if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) { | |
| 43 return 0; | |
| 44 } | |
| 45 | |
| 46 m_malloc_set_epoch(1); | |
| 47 | |
| 48 if (setjmp(fuzz.jmp) == 0) { | |
| 49 /* Based on recv_msg_kexdh_init()/send_msg_kexdh_reply() | |
| 50 with DROPBEAR_KEX_ECDH */ | |
| 51 ses.newkeys = keep_newkeys; | |
| 52 | |
| 53 /* random choice of ecdh 256, 384, 521 */ | |
| 54 unsigned char b = buf_getbyte(fuzz.input); | |
| 55 ses.newkeys->algo_kex = ecdh[b % 3]; | |
| 56 | |
| 57 /* Choose from the collection of ecdh params */ | |
| 58 unsigned int e = buf_getint(fuzz.input); | |
| 59 struct kex_ecdh_param *ecdh_param = ecdh_params[e % NUM_PARAMS]; | |
| 60 | |
| 61 buffer * ecdh_qs = buf_getstringbuf(fuzz.input); | |
| 62 | |
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kexhashbuf was much to small in kex fuzzers
Matt Johnston <matt@ucc.asn.au>
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63 ses.kexhashbuf = buf_new(KEXHASHBUF_MAX_INTS); |
| 1589 | 64 kexecdh_comb_key(ecdh_param, ecdh_qs, svr_opts.hostkey); |
| 65 | |
| 1609 | 66 mp_clear(ses.dh_K); |
| 1589 | 67 m_free(ses.dh_K); |
| 68 buf_free(ecdh_qs); | |
| 69 | |
| 1609 | 70 buf_free(ses.hash); |
| 71 buf_free(ses.session_id); | |
| 72 /* kexhashbuf is freed in kexdh_comb_key */ | |
| 73 | |
| 1589 | 74 m_malloc_free_epoch(1, 0); |
| 75 } else { | |
| 76 m_malloc_free_epoch(1, 1); | |
| 77 TRACE(("dropbear_exit longjmped")) | |
| 78 /* dropbear_exit jumped here */ | |
| 79 } | |
| 80 | |
| 81 return 0; | |
| 82 } |