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Don't allow a cached response from a GET request to be returned for a

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HEAD request. This makes it look like the response to the HEAD request
has a body. As a result, http-enum can wrongly surmise that HEAD
requests don't work when it hits a cache entry while testing HEAD.

# nmap --script=http-date,http-enum -PN -p 80 -d2
NSE: NSE Script Threads (2) running:
NSE: Final http cache size (373 bytes) of max size of 1000000
NSE: HTTP: Host returns proper 404 result.
NSE: Final http cache size (1905 bytes) of max size of 1000000
NSE: Finished 'http-date' (thread: 0x8535a40).
NSE: HTTP: Warning: Host returned data when performing HEAD.
NSE: Checking if a GET request is going to work out

After this change:

NSE: NSE Script Threads (2) running:
NSE: Final http cache size (373 bytes) of max size of 1000000
NSE: HTTP: Host returns proper 404 result.
NSE: Final http cache size (1905 bytes) of max size of 1000000
NSE: Finished 'http-date' (thread: 0x8e75b00).
NSE: Final http cache size (1905 bytes) of max size of 1000000
NSE: HTTP: Host supports HEAD.
This commit is contained in:
david 2010-01-10 19:47:33 +00:00
parent 62ed5336b4
commit 12203a8ae1
1 changed files with 4 additions and 4 deletions
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8
nselib/http.lua
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@ -669,7 +669,7 @@ end
-- record is in the format:
-- result: The result from http.get or http.head
-- last_used: The time the record was last accessed or made.
-- get: Was the result received from a request to get or recently wiped?
-- method: a string, "GET" or "HEAD".
-- size: The size of the record, equal to #record.result.body.
-- network_cost: The cost of the request on the network (upload).
local cache = {size = 0};
@ -701,7 +701,7 @@ local function lookup_cache (method, host, port, path, options)
while true do
mutex "lock";
local record = cache[key];
if bypass_cache or record == nil or method == "GET" and not record.get then
if bypass_cache or record == nil or method ~= record.method then
WORKING[mutex] = coroutine.running();
cache[key], state.old_record = WORKING, record;
return nil, state;
@ -731,14 +731,14 @@ local function insert_cache (state, result, raw_response)
local record = {
result = tcopy(result),
last_used = os.time(),
get = state.method == "GET",
get = state.method,
size = type(result.body) == "string" and #result.body or 0,
network_cost = #raw_response,
};
result = record.result; -- only modify copy
cache[key], cache[#cache+1] = record, record;
if state.no_cache_body then
record.get, result.body = false, "";
result.body = "";
end
if type(result.body) == "string" then
cache.size = cache.size + #result.body;