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Lua file handler #332

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Lua file handler #332

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51963ad
added a function for handling lua files
Oct 13, 2023
445d972
added the logic for calling the lua file handler
Oct 13, 2023
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28 changes: 27 additions & 1 deletion suricata/update/main.py
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Original file line number Diff line number Diff line change
Expand Up @@ -97,7 +97,7 @@
INDEX_EXPIRATION_TIME = 60 * 60 * 24 * 14

# Rule keywords that come with files
file_kw = ["filemd5", "filesha1", "filesha256", "dataset"]
file_kw = ["filemd5", "filesha1", "filesha256", "dataset", "lua", "luajit"]

def strict_error(msg):
logger.error(msg)
Expand Down Expand Up @@ -499,6 +499,28 @@ def handle_filehash_files(rule, dep_files, fhash):
else:
logger.error("{} file {} was not found".format(fhash, filehash_fname))

def handle_lua_rule_files(rule, dep_files, kw):
if not rule.enabled:
return
lua_rule_fname = rule.get(kw)
filename = [fname for fname, content in dep_files.items() if fname == lua_rule_fname]
if filename:
logger.debug("Copying lua file %s to output directory" % (lua_rule_fname))
filepath = os.path.join(config.get_state_dir(), "rules", os.path.dirname(filename[0]))
logger.debug("filepath: %s" % filepath)
try:
os.makedirs(filepath)
except OSError as oserr:
if oserr.errno != errno.EEXIST:
logger.error(oserr)
sys.exit(1)
logger.debug("output fname: %s" % os.path.join(filepath, os.path.basename(lua_rule_fname)))
with open(os.path.join(filepath, os.path.basename(lua_rule_fname)), "w+") as fp:
fp.write(dep_files[lua_rule_fname].decode("utf-8"))
else:
logger.error("lua file {} was not found".format(lua_rule_fname))


def write_merged(filename, rulemap, dep_files):

if not args.quiet:
Expand Down Expand Up @@ -540,6 +562,8 @@ def write_merged(filename, rulemap, dep_files):
if kw in rule:
if "dataset" == kw:
reformatted = handle_dataset_files(rule, dep_files)
elif kw in ["lua", "luajit"]:
handle_lua_rule_files(rule, dep_files, kw)
else:
handle_filehash_files(rule, dep_files, kw)
if reformatted:
Expand Down Expand Up @@ -601,6 +625,8 @@ def write_to_directory(directory, files, rulemap, dep_files):
if kw in rule:
if "dataset" == kw:
reformatted = handle_dataset_files(rulemap[rule.id], dep_files)
elif kw in ["lua", "luajit"]:
handle_lua_rule_files(rulemap[rule.id], dep_files, kw)
else:
handle_filehash_files(rulemap[rule.id], dep_files, kw)
if reformatted:
Expand Down
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