Mercurial > dropbear
annotate fuzz-common.c @ 1371:bc9e2e148f58 fuzz
avoid NULL argument to base64 decode
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Thu, 25 May 2017 00:09:40 +0800 |
| parents | ddfcadca3c4c |
| children | 9891bc31a1b3 |
| rev | line source |
|---|---|
| 1348 | 1 #include "includes.h" |
| 2 | |
| 3 #include "includes.h" | |
| 4 #include "fuzz.h" | |
| 5 #include "dbutil.h" | |
| 6 #include "runopts.h" | |
| 1353 | 7 #include "crypto_desc.h" |
| 8 #include "session.h" | |
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9 #include "dbrandom.h" |
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10 #include "fuzz-wrapfd.h" |
| 1348 | 11 |
| 12 struct dropbear_fuzz_options fuzz; | |
| 13 | |
| 14 static void load_fixed_hostkeys(void); | |
| 15 | |
| 1369 | 16 void common_setup_fuzzer(void) { |
| 1348 | 17 fuzz.fuzzing = 1; |
| 1357 | 18 fuzz.wrapfds = 1; |
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19 fuzz.input = m_malloc(sizeof(buffer)); |
| 1350 | 20 crypto_init(); |
| 1348 | 21 } |
| 22 | |
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23 int fuzzer_set_input(const uint8_t *Data, size_t Size) { |
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24 |
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25 fuzz.input->data = (unsigned char*)Data; |
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26 fuzz.input->size = Size; |
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27 fuzz.input->len = Size; |
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28 fuzz.input->pos = 0; |
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29 |
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30 memset(&ses, 0x0, sizeof(ses)); |
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31 memset(&svr_ses, 0x0, sizeof(svr_ses)); |
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32 |
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33 // get prefix. input format is |
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34 // string prefix |
| 1357 | 35 // uint32 wrapfd seed |
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36 // ... to be extended later |
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37 // [bytes] ssh input stream |
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38 |
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39 // be careful to avoid triggering buffer.c assertions |
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40 if (fuzz.input->len < 8) { |
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41 return DROPBEAR_FAILURE; |
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42 } |
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43 size_t prefix_size = buf_getint(fuzz.input); |
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44 if (prefix_size != 4) { |
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45 return DROPBEAR_FAILURE; |
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46 } |
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47 uint32_t wrapseed = buf_getint(fuzz.input); |
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48 wrapfd_setup(wrapseed); |
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49 |
| 1369 | 50 fuzz_seed(); |
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51 |
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52 return DROPBEAR_SUCCESS; |
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53 } |
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54 |
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55 |
| 1348 | 56 void svr_setup_fuzzer(void) { |
| 57 struct passwd *pw; | |
| 58 | |
| 59 common_setup_fuzzer(); | |
| 1353 | 60 |
| 61 _dropbear_exit = svr_dropbear_exit; | |
| 62 _dropbear_log = svr_dropbear_log; | |
| 1348 | 63 |
| 64 char *argv[] = { | |
| 65 "-E", | |
| 66 }; | |
| 67 | |
| 68 int argc = sizeof(argv) / sizeof(*argv); | |
| 69 svr_getopts(argc, argv); | |
| 70 | |
| 71 /* user lookups might be slow, cache it */ | |
| 72 pw = getpwuid(getuid()); | |
| 73 dropbear_assert(pw); | |
| 74 fuzz.pw_name = m_strdup(pw->pw_name); | |
| 75 fuzz.pw_dir = m_strdup(pw->pw_dir); | |
| 76 fuzz.pw_shell = m_strdup(pw->pw_shell); | |
| 77 fuzz.pw_passwd = m_strdup("!!zzznope"); | |
| 78 | |
| 79 load_fixed_hostkeys(); | |
| 80 } | |
| 81 | |
| 82 static void load_fixed_hostkeys(void) { | |
| 83 #include "fuzz-hostkeys.c" | |
| 84 | |
| 85 buffer *b = buf_new(3000); | |
| 86 enum signkey_type type; | |
| 87 | |
| 88 TRACE(("load fixed hostkeys")) | |
| 89 | |
| 90 svr_opts.hostkey = new_sign_key(); | |
| 91 | |
| 92 buf_setlen(b, 0); | |
| 93 buf_putbytes(b, keyr, keyr_len); | |
| 94 buf_setpos(b, 0); | |
| 95 type = DROPBEAR_SIGNKEY_RSA; | |
| 96 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) { | |
| 97 dropbear_exit("failed fixed rsa hostkey"); | |
| 98 } | |
| 99 | |
| 100 buf_setlen(b, 0); | |
| 101 buf_putbytes(b, keyd, keyd_len); | |
| 102 buf_setpos(b, 0); | |
| 103 type = DROPBEAR_SIGNKEY_DSS; | |
| 104 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) { | |
| 105 dropbear_exit("failed fixed dss hostkey"); | |
| 106 } | |
| 107 | |
| 108 buf_setlen(b, 0); | |
| 109 buf_putbytes(b, keye, keye_len); | |
| 110 buf_setpos(b, 0); | |
| 111 type = DROPBEAR_SIGNKEY_ECDSA_NISTP256; | |
| 112 if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) { | |
| 113 dropbear_exit("failed fixed ecdsa hostkey"); | |
| 114 } | |
| 115 | |
| 116 buf_free(b); | |
| 117 } | |
| 118 | |
| 1357 | 119 void fuzz_kex_fakealgos(void) { |
| 120 ses.newkeys->recv.crypt_mode = &dropbear_mode_none; | |
| 121 } |