Mercurial > dropbear

annotate fuzz/fuzzer-kexcurve25519.c @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +0800
parents 0cc85b4a4abb
children
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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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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 }