Mercurial > dropbear
annotate fuzz-harness.c @ 1715:3974f087d9c0
Disallow leading lines before the ident for server (#102)
Per RFC4253 4.2 clients must be able to process other lines of data
before the version string, server behavior is not defined neither
with MUST/SHOULD nor with MAY.
If server process up to 50 lines too - it may cause too long hanging
session with invalid/evil client that consume host resources and
potentially may lead to DDoS on poor embedded boxes.
Let's require first line from client to be version string and fail
early if it's not - matches both RFC and real OpenSSH behavior.
| author | Vladislav Grishenko <themiron@users.noreply.github.com> |
|---|---|
| date | Mon, 15 Jun 2020 18:22:18 +0500 |
| parents | bff41a61a1b6 |
| children | dfbe947bdf0d |
| rev | line source |
|---|---|
| 1348 | 1 #include "includes.h" |
| 1354 | 2 #include "buffer.h" |
| 3 #include "dbutil.h" | |
| 1348 | 4 |
| 5 extern int LLVMFuzzerTestOneInput(const unsigned char *data, size_t size); | |
| 6 | |
| 7 int main(int argc, char ** argv) { | |
| 1354 | 8 int i; |
| 9 buffer *input = buf_new(100000); | |
| 10 | |
| 1363 | 11 for (i = 1; i < argc; i++) { |
|
1589
35af85194268
Add kexdh and kexecdh fuzzers
Matt Johnston <matt@ucc.asn.au>
parents:
1559
diff
changeset
|
12 printf("arg %s\n", argv[i]); |
| 1363 | 13 #if DEBUG_TRACE |
| 14 if (strcmp(argv[i], "-v") == 0) { | |
| 15 debug_trace = 1; | |
|
1373
9891bc31a1b3
fuzzers disable logging by default
Matt Johnston <matt@ucc.asn.au>
parents:
1363
diff
changeset
|
16 TRACE(("debug printing on")) |
| 1363 | 17 } |
| 1357 | 18 #endif |
| 1363 | 19 } |
| 1357 | 20 |
|
1605
bff41a61a1b6
Disable wrapfds outside of fuzzed code
Matt Johnston <matt@ucc.asn.au>
parents:
1589
diff
changeset
|
21 int old_fuzz_wrapfds = 0; |
| 1354 | 22 for (i = 1; i < argc; i++) { |
| 1363 | 23 if (argv[i][0] == '-') { |
|
1559
92c93b4a3646
Fix to be able to compile normal(ish) binaries with --enable-fuzz
Matt Johnston <matt@ucc.asn.au>
parents:
1373
diff
changeset
|
24 /* ignore arguments */ |
| 1363 | 25 continue; |
| 26 } | |
| 27 | |
| 1354 | 28 char* fn = argv[i]; |
| 29 buf_setlen(input, 0); | |
| 30 buf_readfile(input, fn); | |
| 31 buf_setpos(input, 0); | |
| 32 | |
|
1605
bff41a61a1b6
Disable wrapfds outside of fuzzed code
Matt Johnston <matt@ucc.asn.au>
parents:
1589
diff
changeset
|
33 fuzz.wrapfds = old_fuzz_wrapfds; |
|
1358
6b89eb92f872
glaring wrapfd problems fixed
Matt Johnston <matt@ucc.asn.au>
parents:
1357
diff
changeset
|
34 printf("Running %s once \n", fn); |
|
6b89eb92f872
glaring wrapfd problems fixed
Matt Johnston <matt@ucc.asn.au>
parents:
1357
diff
changeset
|
35 LLVMFuzzerTestOneInput(input->data, input->len); |
|
6b89eb92f872
glaring wrapfd problems fixed
Matt Johnston <matt@ucc.asn.au>
parents:
1357
diff
changeset
|
36 printf("Running %s twice \n", fn); |
| 1354 | 37 LLVMFuzzerTestOneInput(input->data, input->len); |
| 38 printf("Done %s\n", fn); | |
|
1605
bff41a61a1b6
Disable wrapfds outside of fuzzed code
Matt Johnston <matt@ucc.asn.au>
parents:
1589
diff
changeset
|
39 |
|
bff41a61a1b6
Disable wrapfds outside of fuzzed code
Matt Johnston <matt@ucc.asn.au>
parents:
1589
diff
changeset
|
40 /* Disable wrapfd so it won't interfere with buf_readfile() above */ |
|
bff41a61a1b6
Disable wrapfds outside of fuzzed code
Matt Johnston <matt@ucc.asn.au>
parents:
1589
diff
changeset
|
41 old_fuzz_wrapfds = fuzz.wrapfds; |
|
bff41a61a1b6
Disable wrapfds outside of fuzzed code
Matt Johnston <matt@ucc.asn.au>
parents:
1589
diff
changeset
|
42 fuzz.wrapfds = 0; |
| 1354 | 43 } |
| 44 | |
| 45 printf("Finished\n"); | |
| 46 | |
| 1348 | 47 return 0; |
| 48 } |