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Allow module_hash_binary_parse to report a fatal error

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If module_hash_binary_parse is completely unable to successfully parse out
any hashes, up until now the output has been

```
Hashfile 'foo': Success
```

which is less than helpful.

This patch allows (but does not require) m_h_binary_parse to report a useful
error response, by returning a negative value.  Modules which continue to
return '0 hashes' will get the same less-than-useful behaviour they always
hace.

I've also modified the LUKS module to report a useful error, as a proof of
concept.

Further expansions on this could include:

* Applying similar behaviour to module_hash_binary_count, so it too can
  report errors when trying to count hashes.  This would require more
  co-ordinated change, because m_h_binary_count already uses -1 to indicate
  a system error.

* Allow and encourage modules to print their own errors and warnings during
  parsing.  This would allow for situations where a single hash in a
  multi-hash file could be reported as malformed, without having to fail the
  whole parse.  However, implementing this would, I expect, require modules
  to have access to `hashcat_ctx`, which...  yeah.  Not so straightforward.
This commit is contained in:
Matt Palmer 2020-04-23 11:41:27 +10:00
parent c5d2d5396f
commit b4204d265d
2 changed files with 19 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
src/hashes.c
View File

@ -1296,10 +1296,14 @@ int hashes_init_stage1 (hashcat_ctx_t *hashcat_ctx)
{
hashes_cnt = hashes_parsed;
}
else
else if (hashes_parsed == 0)
{
event_log_warning (hashcat_ctx, "Hashfile '%s': %s", hashes->hashfile, strerror (errno));
}
else
{
event_log_warning (hashcat_ctx, "Hashfile '%s': %s", hashes->hashfile, strparser (hashes_parsed));
}
}
else
{

14
src/modules/module_14600.c
View File

@ -235,6 +235,7 @@ int module_hash_binary_parse (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE
hash_t *hashes_buf = hashes->hashes_buf;
int hashes_cnt = 0;
int last_error = 0;
for (int keyslot_idx = 0; keyslot_idx < LUKS_NUMKEYS; keyslot_idx++)
{
@ -246,12 +247,23 @@ int module_hash_binary_parse (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE
const int parser_status = module_hash_decode (hashconfig, hash->digest, hash->salt, hash->esalt, hash->hook_salt, hash->hash_info, hashes->hashfile, strlen (hashes->hashfile));
if (parser_status != PARSER_OK) continue;
if (parser_status != PARSER_OK)
{
last_error = parser_status;
continue;
}
hashes_cnt++;
}
if (hashes_cnt == 0)
{
return last_error;
}
else
{
return hashes_cnt;
}
}
u64 module_kern_type_dynamic (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const void *digest_buf, MAYBE_UNUSED const salt_t *salt, MAYBE_UNUSED const void *esalt_buf, MAYBE_UNUSED const void *hook_salt_buf, MAYBE_UNUSED const hashinfo_t *hash_info)