mirror of
https://github.com/luanti-org/luanti.git
synced 2025-09-15 18:57:08 +00:00
Add Lua interface to HTTPFetchRequest
This allows mods to perform both asynchronous and synchronous HTTP requests. Mods are only granted access to HTTP APIs if either mod security is disabled or if they are whitelisted in any of the the secure.http_mods and secure.trusted_mods settings. Adds httpfetch_caller_alloc_secure to generate random, non-predictable caller IDs so that lua mods cannot spy on each others HTTP queries.
This commit is contained in:
parent
a3892f5a66
commit
31e0667a4a
12 changed files with 357 additions and 1 deletions
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@ -285,6 +285,7 @@ void set_default_settings(Settings *settings)
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settings->setDefault("num_emerge_threads", "1");
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settings->setDefault("secure.enable_security", "false");
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settings->setDefault("secure.trusted_mods", "");
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settings->setDefault("secure.http_mods", "");
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// physics stuff
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settings->setDefault("movement_acceleration_default", "3");
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@ -18,7 +18,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
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*/
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#include "socket.h" // for select()
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#include "porting.h" // for sleep_ms(), get_sysinfo()
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#include "porting.h" // for sleep_ms(), get_sysinfo(), secure_rand_fill_buf()
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#include "httpfetch.h"
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#include <iostream>
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#include <sstream>
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@ -34,9 +34,11 @@ with this program; if not, write to the Free Software Foundation, Inc.,
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#include "util/thread.h"
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#include "version.h"
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#include "settings.h"
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#include "noise.h"
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Mutex g_httpfetch_mutex;
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std::map<unsigned long, std::queue<HTTPFetchResult> > g_httpfetch_results;
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PcgRandom g_callerid_randomness;
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HTTPFetchRequest::HTTPFetchRequest()
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{
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@ -84,6 +86,34 @@ unsigned long httpfetch_caller_alloc()
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return discard;
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}
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unsigned long httpfetch_caller_alloc_secure()
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{
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MutexAutoLock lock(g_httpfetch_mutex);
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// Generate random caller IDs and make sure they're not
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// already used or equal to HTTPFETCH_DISCARD
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// Give up after 100 tries to prevent infinite loop
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u8 tries = 100;
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unsigned long caller;
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do {
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caller = (((u64) g_callerid_randomness.next()) << 32) |
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g_callerid_randomness.next();
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if (--tries < 1) {
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FATAL_ERROR("httpfetch_caller_alloc_secure: ran out of caller IDs");
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return HTTPFETCH_DISCARD;
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}
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} while (g_httpfetch_results.find(caller) != g_httpfetch_results.end());
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verbosestream << "httpfetch_caller_alloc_secure: allocating "
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<< caller << std::endl;
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// Access element to create it
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g_httpfetch_results[caller];
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return caller;
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}
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void httpfetch_caller_free(unsigned long caller)
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{
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verbosestream<<"httpfetch_caller_free: freeing "
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@ -710,6 +740,11 @@ void httpfetch_init(int parallel_limit)
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FATAL_ERROR_IF(res != CURLE_OK, "CURL init failed");
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g_httpfetch_thread = new CurlFetchThread(parallel_limit);
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// Initialize g_callerid_randomness for httpfetch_caller_alloc_secure
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u64 randbuf[2];
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porting::secure_rand_fill_buf(randbuf, sizeof(u64) * 2);
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g_callerid_randomness = PcgRandom(randbuf[0], randbuf[1]);
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}
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void httpfetch_cleanup()
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@ -116,6 +116,9 @@ bool httpfetch_async_get(unsigned long caller, HTTPFetchResult &fetch_result);
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// Not required if you want to set caller = HTTPFETCH_DISCARD
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unsigned long httpfetch_caller_alloc();
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// Allocates a non-predictable caller ID for httpfetch_async
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unsigned long httpfetch_caller_alloc_secure();
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// Frees a caller ID allocated with httpfetch_caller_alloc
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// Note: This can be expensive, because the httpfetch thread is told
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// to stop any ongoing fetches for the given caller.
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@ -517,6 +517,15 @@ bool getboolfield_default(lua_State *L, int table,
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return result;
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}
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void setstringfield(lua_State *L, int table,
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const char *fieldname, const char *value)
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{
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lua_pushstring(L, value);
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if(table < 0)
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table -= 1;
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lua_setfield(L, table, fieldname);
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}
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void setintfield(lua_State *L, int table,
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const char *fieldname, int value)
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{
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@ -69,6 +69,8 @@ bool getfloatfield(lua_State *L, int table,
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std::string checkstringfield(lua_State *L, int table,
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const char *fieldname);
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void setstringfield(lua_State *L, int table,
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const char *fieldname, const char *value);
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void setintfield(lua_State *L, int table,
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const char *fieldname, int value);
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void setfloatfield(lua_State *L, int table,
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@ -16,6 +16,7 @@ set(common_SCRIPT_LUA_API_SRCS
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${CMAKE_CURRENT_SOURCE_DIR}/l_util.cpp
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${CMAKE_CURRENT_SOURCE_DIR}/l_vmanip.cpp
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${CMAKE_CURRENT_SOURCE_DIR}/l_settings.cpp
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${CMAKE_CURRENT_SOURCE_DIR}/l_http.cpp
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PARENT_SCOPE)
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set(client_SCRIPT_LUA_API_SRCS
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176
src/script/lua_api/l_http.cpp
Normal file
176
src/script/lua_api/l_http.cpp
Normal file
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@ -0,0 +1,176 @@
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/*
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Minetest
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Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "lua_api/l_internal.h"
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#include "common/c_converter.h"
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#include "common/c_content.h"
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#include "lua_api/l_http.h"
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#include "httpfetch.h"
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#include "settings.h"
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#include "log.h"
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#include <algorithm>
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#include <iomanip>
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#include <cctype>
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#define HTTP_API(name) \
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lua_pushstring(L, #name); \
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lua_pushcfunction(L, l_http_##name); \
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lua_settable(L, -3);
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#if USE_CURL
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void ModApiHttp::read_http_fetch_request(lua_State *L, HTTPFetchRequest &req)
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{
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luaL_checktype(L, 1, LUA_TTABLE);
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req.caller = httpfetch_caller_alloc_secure();
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getstringfield(L, 1, "url", req.url);
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lua_getfield(L, 1, "user_agent");
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if (lua_isstring(L, -1))
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req.useragent = getstringfield_default(L, 1, "user_agent", "");
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lua_pop(L, 1);
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req.multipart = getboolfield_default(L, 1, "multipart", false);
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req.timeout = getintfield_default(L, 1, "timeout", 3) * 1000;
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// post_data: if table, post form data, otherwise raw data
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lua_getfield(L, 1, "post_data");
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if (lua_istable(L, 2)) {
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lua_pushnil(L);
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while (lua_next(L, 2) != 0)
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{
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req.post_fields[luaL_checkstring(L, -2)] = luaL_checkstring(L, -1);
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lua_pop(L, 1);
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}
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} else if (lua_isstring(L, 2)) {
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req.post_data = lua_tostring(L, 2);
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}
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lua_pop(L, 1);
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lua_getfield(L, 1, "extra_headers");
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if (lua_istable(L, 2)) {
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lua_pushnil(L);
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while (lua_next(L, 2) != 0)
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{
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const char *header = luaL_checkstring(L, -1);
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req.extra_headers.push_back(header);
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lua_pop(L, 1);
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}
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}
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lua_pop(L, 1);
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}
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void ModApiHttp::push_http_fetch_result(lua_State *L, HTTPFetchResult &res, bool completed)
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{
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lua_newtable(L);
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setboolfield(L, -1, "succeeded", res.succeeded);
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setboolfield(L, -1, "timeout", res.timeout);
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setboolfield(L, -1, "completed", completed);
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setintfield(L, -1, "code", res.response_code);
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setstringfield(L, -1, "data", res.data.c_str());
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}
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// http_api.fetch_async(HTTPRequest definition)
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int ModApiHttp::l_http_fetch_async(lua_State *L)
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{
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NO_MAP_LOCK_REQUIRED;
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HTTPFetchRequest req;
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read_http_fetch_request(L, req);
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actionstream << "Mod performs HTTP request with URL " << req.url << std::endl;
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httpfetch_async(req);
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// Convert handle to hex string since lua can't handle 64-bit integers
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std::stringstream handle_conversion_stream;
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handle_conversion_stream << std::hex << req.caller;
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std::string caller_handle(handle_conversion_stream.str());
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lua_pushstring(L, caller_handle.c_str());
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return 1;
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}
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// http_api.fetch_async_get(handle)
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int ModApiHttp::l_http_fetch_async_get(lua_State *L)
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{
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NO_MAP_LOCK_REQUIRED;
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std::string handle_str = luaL_checkstring(L, 1);
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// Convert hex string back to 64-bit handle
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u64 handle;
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std::stringstream handle_conversion_stream;
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handle_conversion_stream << std::hex << handle_str;
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handle_conversion_stream >> handle;
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HTTPFetchResult res;
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bool completed = httpfetch_async_get(handle, res);
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push_http_fetch_result(L, res, completed);
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return 1;
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}
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int ModApiHttp::l_request_http_api(lua_State *L)
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{
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NO_MAP_LOCK_REQUIRED;
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// Mod must be listed in secure.http_mods or secure.trusted_mods
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lua_rawgeti(L, LUA_REGISTRYINDEX, CUSTOM_RIDX_CURRENT_MOD_NAME);
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if (!lua_isstring(L, -1)) {
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lua_pushnil(L);
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return 1;
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}
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const char *mod_name = lua_tostring(L, -1);
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std::string http_mods = g_settings->get("secure.http_mods");
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http_mods.erase(std::remove(http_mods.begin(), http_mods.end(), ' '), http_mods.end());
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std::vector<std::string> mod_list_http = str_split(http_mods, ',');
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std::string trusted_mods = g_settings->get("secure.trusted_mods");
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trusted_mods.erase(std::remove(trusted_mods.begin(), trusted_mods.end(), ' '), trusted_mods.end());
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std::vector<std::string> mod_list_trusted = str_split(trusted_mods, ',');
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mod_list_http.insert(mod_list_http.end(), mod_list_trusted.begin(), mod_list_trusted.end());
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if (std::find(mod_list_http.begin(), mod_list_http.end(), mod_name) == mod_list_http.end()) {
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lua_pushnil(L);
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return 1;
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}
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lua_getglobal(L, "core");
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lua_getfield(L, -1, "http_add_fetch");
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lua_newtable(L);
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HTTP_API(fetch_async);
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HTTP_API(fetch_async_get);
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// Stack now looks like this:
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// <core.http_add_fetch> <table with fetch_async, fetch_async_get>
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// Now call core.http_add_fetch to append .fetch(request, callback) to table
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lua_call(L, 1, 1);
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return 1;
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}
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#endif
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void ModApiHttp::Initialize(lua_State *L, int top)
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{
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#if USE_CURL
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API_FCT(request_http_api);
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#endif
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}
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50
src/script/lua_api/l_http.h
Normal file
50
src/script/lua_api/l_http.h
Normal file
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@ -0,0 +1,50 @@
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/*
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Minetest
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Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef L_HTTP_H_
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#define L_HTTP_H_
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#include "lua_api/l_base.h"
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#include "config.h"
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struct HTTPFetchRequest;
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struct HTTPFetchResult;
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class ModApiHttp : public ModApiBase {
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private:
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#if USE_CURL
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// Helpers for HTTP fetch functions
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static void read_http_fetch_request(lua_State *L, HTTPFetchRequest &req);
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static void push_http_fetch_result(lua_State *L, HTTPFetchResult &res, bool completed = true);
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// http_fetch_async({url=, timeout=, post_data=})
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static int l_http_fetch_async(lua_State *L);
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// http_fetch_async_get(handle)
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static int l_http_fetch_async_get(lua_State *L);
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// request_http_api()
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static int l_request_http_api(lua_State *L);
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#endif
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public:
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static void Initialize(lua_State *L, int top);
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};
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#endif /* L_HTTP_H_ */
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@ -39,6 +39,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
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#include "lua_api/l_util.h"
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#include "lua_api/l_vmanip.h"
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#include "lua_api/l_settings.h"
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#include "lua_api/l_http.h"
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extern "C" {
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#include "lualib.h"
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ModApiRollback::Initialize(L, top);
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ModApiServer::Initialize(L, top);
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ModApiUtil::Initialize(L, top);
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ModApiHttp::Initialize(L, top);
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// Register reference classes (userdata)
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InvRef::Register(L);
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