mirror of
https://github.com/unrealircd/unrealircd.git
synced 2026-07-02 18:13:14 +02:00
Bram Matthys
c3824ad47d
This makes websocket_common unload last (and near-last: rpc & websocket) and makes us call Mod_Init for these three modules first. This way, the period where the websocket handler is unavailable is kept to a minimum. This also renames the ModuleSetOptions option MOD_OPT_UNLOAD_PRIORITY to MOD_OPT_PRIORITY since it dynamically changes the module priority in the list. For 6.x compatibility, MOD_OPT_UNLOAD_PRIORITY can still be used.
689 lines
20 KiB
C
689 lines
20 KiB
C
/*
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* websocket - WebSocket support (RFC6455)
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* (C)Copyright 2016 Bram Matthys and the UnrealIRCd team
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* License: GPLv2 or later
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* This module was sponsored by Aberrant Software Inc.
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*/
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#include "unrealircd.h"
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#include "dns.h"
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#define WEBSOCKET_VERSION "1.1.0"
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ModuleHeader MOD_HEADER
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= {
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"websocket",
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WEBSOCKET_VERSION,
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"WebSocket support (RFC6455)",
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"UnrealIRCd Team",
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"unrealircd-6",
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};
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#if CHAR_MIN < 0
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#error "In UnrealIRCd char should always be unsigned. Check your compiler"
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#endif
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#ifndef WEBSOCKET_SEND_BUFFER_SIZE
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#define WEBSOCKET_SEND_BUFFER_SIZE 16384
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#endif
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#define WSU(client) ((WebSocketUser *)moddata_client(client, websocket_md).ptr)
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#define WEBSOCKET_PORT(client) ((client->local && client->local->listener) ? client->local->listener->websocket_options : 0)
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#define WEBSOCKET_TYPE(client) (WSU(client)->type)
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/* used to parse http Forwarded header (RFC 7239) */
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#define IPLEN 48
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#define FHEADER_NAMELEN 20
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struct HTTPForwardedHeader
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{
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int secure;
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char hostname[HOSTLEN+1];
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char ip[IPLEN+1];
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};
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/* Forward declarations */
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int websocket_config_test(ConfigFile *cf, ConfigEntry *ce, int type, int *errs);
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int websocket_config_posttest(int *);
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int websocket_config_run_ex(ConfigFile *cf, ConfigEntry *ce, int type, void *ptr);
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int websocket_packet_out(Client *from, Client *to, Client *intended_to, char **msg, int *length);
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int websocket_handle_handshake(Client *client, const char *readbuf, int *length);
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int websocket_handshake_send_response(Client *client);
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int websocket_handle_body_websocket(Client *client, WebRequest *web, const char *readbuf2, int length2);
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int websocket_secure_connect(Client *client);
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struct HTTPForwardedHeader *websocket_parse_forwarded_header(char *input);
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int websocket_ip_compare(const char *ip1, const char *ip2);
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int websocket_handle_request(Client *client, WebRequest *web);
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/* Global variables */
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ModDataInfo *websocket_md;
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static int ws_text_mode_available = 1;
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MOD_TEST()
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{
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HookAdd(modinfo->handle, HOOKTYPE_CONFIGTEST, 0, websocket_config_test);
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HookAdd(modinfo->handle, HOOKTYPE_CONFIGPOSTTEST, 0, websocket_config_posttest);
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/* Call MOD_INIT very early, since we manage sockets, but depend on websocket_common */
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ModuleSetOptions(modinfo->handle, MOD_OPT_PRIORITY, WEBSOCKET_MODULE_PRIORITY_INIT+1);
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return MOD_SUCCESS;
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}
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MOD_INIT()
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{
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ModDataInfo mreq;
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MARK_AS_OFFICIAL_MODULE(modinfo);
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websocket_md = findmoddata_byname("websocket", MODDATATYPE_CLIENT);
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if (!websocket_md)
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config_warn("The 'websocket_common' module is not loaded, even though it was promised to be ???");
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HookAdd(modinfo->handle, HOOKTYPE_CONFIGRUN_EX, 0, websocket_config_run_ex);
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HookAdd(modinfo->handle, HOOKTYPE_PACKET, INT_MAX, websocket_packet_out);
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HookAdd(modinfo->handle, HOOKTYPE_SECURE_CONNECT, 0, websocket_secure_connect);
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/* Call MOD_LOAD very late, since we manage sockets, but depend on websocket_common */
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ModuleSetOptions(modinfo->handle, MOD_OPT_PRIORITY, WEBSOCKET_MODULE_PRIORITY_UNLOAD-1);
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return MOD_SUCCESS;
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}
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MOD_LOAD()
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{
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if (non_utf8_nick_chars_in_use || (iConf.allowed_channelchars == ALLOWED_CHANNELCHARS_ANY))
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ws_text_mode_available = 0;
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return MOD_SUCCESS;
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}
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MOD_UNLOAD()
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{
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return MOD_SUCCESS;
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}
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int websocket_config_test(ConfigFile *cf, ConfigEntry *ce, int type, int *errs)
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{
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int errors = 0;
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ConfigEntry *cep;
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int has_type = 0;
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static char errored_once_nick = 0;
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if (type != CONFIG_LISTEN_OPTIONS)
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return 0;
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/* We are only interrested in listen::options::websocket.. */
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if (!ce || !ce->name || strcmp(ce->name, "websocket"))
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return 0;
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for (cep = ce->items; cep; cep = cep->next)
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{
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if (!strcmp(cep->name, "type"))
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{
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CheckNull(cep);
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has_type = 1;
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if (!strcmp(cep->value, "text"))
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{
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if (non_utf8_nick_chars_in_use && !errored_once_nick)
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{
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/* This one is a hard error, since the consequences are grave */
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config_error("You have a websocket listener with type 'text' AND your set::allowed-nickchars contains at least one non-UTF8 character set.");
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config_error("This is a very BAD idea as this makes your websocket vulnerable to UTF8 conversion attacks. "
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"This can cause things like unkickable users and 'ghosts' for websocket users.");
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config_error("You have 4 options: 1) Remove the websocket listener, 2) Use websocket type 'binary', "
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"3) Remove the non-UTF8 character set from set::allowed-nickchars, 4) Replace the non-UTF8 with an UTF8 character set in set::allowed-nickchars");
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config_error("For more details see https://www.unrealircd.org/docs/WebSocket_support#websockets-and-non-utf8");
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errored_once_nick = 1;
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errors++;
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}
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}
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else if (!strcmp(cep->value, "binary"))
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{
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}
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else
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{
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config_error("%s:%i: listen::options::websocket::type must be either 'binary' or 'text' (not '%s')",
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cep->file->filename, cep->line_number, cep->value);
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errors++;
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}
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} else if (!strcmp(cep->name, "forward"))
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{
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if (!cep->value)
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{
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config_error_empty(cep->file->filename, cep->line_number, "listen::options::websocket::forward", cep->name);
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errors++;
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continue;
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}
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if (!is_valid_ip(cep->value))
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{
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config_error("%s:%i: invalid IP address '%s' in listen::options::websocket::forward", cep->file->filename, cep->line_number, cep->value);
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errors++;
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continue;
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}
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} else
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{
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config_error("%s:%i: unknown directive listen::options::websocket::%s",
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cep->file->filename, cep->line_number, cep->name);
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errors++;
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continue;
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}
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}
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if (!has_type)
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{
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config_error("%s:%i: websocket set, but type unspecified. Use something like: listen { ip *; port 443; websocket { type text; } }",
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ce->file->filename, ce->line_number);
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errors++;
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}
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*errs = errors;
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return errors ? -1 : 1;
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}
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int websocket_config_run_ex(ConfigFile *cf, ConfigEntry *ce, int type, void *ptr)
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{
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ConfigEntry *cep, *cepp;
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ConfigItem_listen *l;
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static char warned_once_channel = 0;
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if (type != CONFIG_LISTEN_OPTIONS)
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return 0;
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/* We are only interrested in listen::options::websocket.. */
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if (!ce || !ce->name || strcmp(ce->name, "websocket"))
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return 0;
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l = (ConfigItem_listen *)ptr;
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l->webserver = safe_alloc(sizeof(WebServer));
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l->webserver->handle_request = websocket_handle_request;
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l->webserver->handle_body = websocket_handle_body_websocket;
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for (cep = ce->items; cep; cep = cep->next)
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{
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if (!strcmp(cep->name, "type"))
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{
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if (!strcmp(cep->value, "binary"))
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l->websocket_options = WEBSOCKET_TYPE_BINARY;
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else if (!strcmp(cep->value, "text"))
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{
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l->websocket_options = WEBSOCKET_TYPE_TEXT;
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if ((tempiConf.allowed_channelchars == ALLOWED_CHANNELCHARS_ANY) && !warned_once_channel)
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{
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/* This one is a warning, since the consequences are less grave than with nicks */
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config_warn("You have a websocket listener with type 'text' AND your set::allowed-channelchars is set to 'any'.");
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config_warn("This is not a recommended combination as this makes your websocket vulnerable to UTF8 conversion attacks. "
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"This can cause things like unpartable channels for websocket users.");
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config_warn("It is highly recommended that you use set { allowed-channelchars utf8; }");
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config_warn("For more details see https://www.unrealircd.org/docs/WebSocket_support#websockets-and-non-utf8");
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warned_once_channel = 1;
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}
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}
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} else if (!strcmp(cep->name, "forward"))
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{
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safe_strdup(l->websocket_forward, cep->value);
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}
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}
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return 1;
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}
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int websocket_config_posttest(int *errs)
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{
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int errors = 0;
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char webserver_module = 1, websocket_common_module = 1;
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if (!is_module_loaded("webserver"))
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{
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config_error("The 'websocket' module requires the 'webserver' module to be loaded, otherwise websocket connections will not work!");
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webserver_module = 0;
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errors++;
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}
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if (!is_module_loaded("websocket_common"))
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{
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config_error("The 'websocket' module requires the 'websocket_common' module to be loaded, otherwise websocket connections will not work!");
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websocket_common_module = 0;
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errors++;
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}
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/* Is nicer for the admin when these are grouped... */
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if (!webserver_module)
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config_error("Add the following line to your config file: loadmodule \"webserver\";");
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if (!websocket_common_module)
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config_error("Add the following line to your config file: loadmodule \"websocket_common\";");
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*errs = errors;
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return errors ? -1 : 1;
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}
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/* Add LF (if needed) to a buffer. Max 4K. */
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void add_lf_if_needed(char **buf, int *len)
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{
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static char newbuf[4096];
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char *b = *buf;
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int l = *len;
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if (l <= 0)
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return; /* too short */
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if (b[l - 1] == '\n')
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return; /* already contains \n */
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if (l >= sizeof(newbuf)-2)
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l = sizeof(newbuf)-2; /* cut-off if necessary */
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memcpy(newbuf, b, l);
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newbuf[l] = '\n';
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newbuf[l + 1] = '\0'; /* not necessary, but I like zero termination */
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l++;
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*buf = newbuf; /* new buffer */
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*len = l; /* new length */
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}
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/** Called on decoded websocket frame (INPUT).
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* Should contain exactly 1 IRC line (command)
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*/
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int websocket_irc_callback(Client *client, char *buf, int len)
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{
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add_lf_if_needed(&buf, &len);
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if (!process_packet(client, buf, len, 1)) /* Let UnrealIRCd handle this as usual */
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return 0; /* client killed */
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return 1;
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}
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int websocket_handle_body_websocket(Client *client, WebRequest *web, const char *readbuf2, int length2)
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{
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return websocket_handle_websocket(client, web, readbuf2, length2, websocket_irc_callback);
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}
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/** Outgoing packet hook.
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* This transforms the output to be Websocket-compliant, if necessary.
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*/
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int websocket_packet_out(Client *from, Client *to, Client *intended_to, char **msg, int *length)
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{
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static char utf8buf[510];
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if (MyConnect(to) && !IsRPC(to) && websocket_md && WSU(to) && WSU(to)->handshake_completed)
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{
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if (WEBSOCKET_TYPE(to) == WEBSOCKET_TYPE_BINARY)
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websocket_create_packet(WSOP_BINARY, msg, length);
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else if (WEBSOCKET_TYPE(to) == WEBSOCKET_TYPE_TEXT)
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{
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/* Some more conversions are needed */
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char *safe_msg = unrl_utf8_make_valid(*msg, utf8buf, sizeof(utf8buf), 1);
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*msg = safe_msg;
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*length = *msg ? strlen(safe_msg) : 0;
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websocket_create_packet(WSOP_TEXT, msg, length);
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}
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return 0;
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}
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return 0;
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}
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#define FHEADER_STATE_NAME 0
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#define FHEADER_STATE_VALUE 1
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#define FHEADER_STATE_VALUE_QUOTED 2
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#define FHEADER_ACTION_APPEND 0
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#define FHEADER_ACTION_IGNORE 1
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#define FHEADER_ACTION_PROCESS 2
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/** If a valid Forwarded: http header is received from a trusted source (proxy server), this function will
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* extract remote IP address and secure (https) status from it. If more than one field with same name is received,
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* we'll accept the last one. This should work correctly with chained proxies. */
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struct HTTPForwardedHeader *websocket_parse_forwarded_header(char *input)
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{
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static struct HTTPForwardedHeader forwarded;
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int i, length;
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int state = FHEADER_STATE_NAME, action = FHEADER_ACTION_APPEND;
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char name[FHEADER_NAMELEN+1];
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char value[IPLEN+1];
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int name_length = 0;
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int value_length = 0;
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char c;
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memset(&forwarded, 0, sizeof(struct HTTPForwardedHeader));
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length = strlen(input);
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for (i = 0; i < length; i++)
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{
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c = input[i];
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switch (c)
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{
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case '"':
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switch (state)
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{
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case FHEADER_STATE_NAME:
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action = FHEADER_ACTION_APPEND;
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break;
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case FHEADER_STATE_VALUE:
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action = FHEADER_ACTION_IGNORE;
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state = FHEADER_STATE_VALUE_QUOTED;
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break;
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case FHEADER_STATE_VALUE_QUOTED:
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action = FHEADER_ACTION_IGNORE;
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state = FHEADER_STATE_VALUE;
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break;
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}
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break;
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case ',': case ';': case ' ':
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switch (state)
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{
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case FHEADER_STATE_NAME: /* name without value */
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name_length = 0;
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action = FHEADER_ACTION_IGNORE;
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break;
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case FHEADER_STATE_VALUE: /* end of value */
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action = FHEADER_ACTION_PROCESS;
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break;
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case FHEADER_STATE_VALUE_QUOTED: /* quoted character, process as normal */
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action = FHEADER_ACTION_APPEND;
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break;
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}
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break;
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case '=':
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switch (state)
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{
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case FHEADER_STATE_NAME: /* end of name */
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name[name_length] = '\0';
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state = FHEADER_STATE_VALUE;
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action = FHEADER_ACTION_IGNORE;
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break;
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case FHEADER_STATE_VALUE: case FHEADER_STATE_VALUE_QUOTED: /* none of the values is expected to contain = but proceed anyway */
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action = FHEADER_ACTION_APPEND;
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break;
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}
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break;
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default:
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action = FHEADER_ACTION_APPEND;
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break;
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}
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switch (action)
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{
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case FHEADER_ACTION_APPEND:
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if (state == FHEADER_STATE_NAME)
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{
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if (name_length < FHEADER_NAMELEN)
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{
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name[name_length++] = c;
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} else
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{
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/* truncate */
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}
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} else
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{
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if (value_length < IPLEN)
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{
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value[value_length++] = c;
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} else
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{
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/* truncate */
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}
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}
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break;
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case FHEADER_ACTION_IGNORE: default:
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break;
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case FHEADER_ACTION_PROCESS:
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value[value_length] = '\0';
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name[name_length] = '\0';
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if (!strcasecmp(name, "for"))
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{
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strlcpy(forwarded.ip, value, IPLEN+1);
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} else if (!strcasecmp(name, "proto"))
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{
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if (!strcasecmp(value, "https"))
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{
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forwarded.secure = 1;
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} else if (!strcasecmp(value, "http"))
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{
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forwarded.secure = 0;
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} else
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{
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/* ignore unknown value */
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}
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} else
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{
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/* ignore unknown field name */
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}
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value_length = 0;
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name_length = 0;
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state = FHEADER_STATE_NAME;
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break;
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}
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}
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return &forwarded;
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}
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/** We got a HTTP(S) request and we need to check if we can upgrade the connection
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* to a websocket connection.
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*/
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int websocket_handle_request(Client *client, WebRequest *web)
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{
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NameValuePrioList *r;
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const char *key, *value;
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/* Allocate a new WebSocketUser struct for this session */
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moddata_client(client, websocket_md).ptr = safe_alloc(sizeof(WebSocketUser));
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/* ...and set the default protocol (text or binary) */
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WSU(client)->type = client->local->listener->websocket_options;
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/** Now step through the lines.. **/
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for (r = web->headers; r; r = r->next)
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{
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key = r->name;
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value = r->value;
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if (!strcasecmp(key, "Sec-WebSocket-Key"))
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{
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if (strchr(value, ':'))
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{
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/* This would cause unserialization issues. Should be base64 anyway */
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webserver_send_response(client, 400, "Invalid characters in Sec-WebSocket-Key");
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return -1;
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}
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safe_strdup(WSU(client)->handshake_key, value);
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} else
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if (!strcasecmp(key, "Sec-WebSocket-Protocol"))
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{
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/* Save it here, will be processed later */
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safe_strdup(WSU(client)->sec_websocket_protocol, value);
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} else
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if (!strcasecmp(key, "Forwarded"))
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{
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/* will be processed later too */
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safe_strdup(WSU(client)->forwarded, value);
|
|
}
|
|
}
|
|
|
|
/** Finally, validate the websocket request (handshake) and proceed or reject. */
|
|
|
|
/* Not websocket and webredir loaded? Let that module serve a redirect. */
|
|
if (!WSU(client)->handshake_key)
|
|
{
|
|
if (is_module_loaded("webredir"))
|
|
{
|
|
const char *parx[2] = { NULL, NULL };
|
|
do_cmd(client, NULL, "GET", 1, parx);
|
|
}
|
|
webserver_send_response(client, 404, "This port is for IRC WebSocket only");
|
|
return 0;
|
|
}
|
|
|
|
/* Sec-WebSocket-Protocol (optional) */
|
|
if (WSU(client)->sec_websocket_protocol)
|
|
{
|
|
char *p = NULL, *name;
|
|
int negotiated = 0;
|
|
|
|
for (name = strtoken(&p, WSU(client)->sec_websocket_protocol, ",");
|
|
name;
|
|
name = strtoken(&p, NULL, ","))
|
|
{
|
|
skip_whitespace(&name);
|
|
if (!strcmp(name, "binary.ircv3.net"))
|
|
{
|
|
negotiated = WEBSOCKET_TYPE_BINARY;
|
|
break; /* First hit wins */
|
|
} else
|
|
if (!strcmp(name, "text.ircv3.net") && ws_text_mode_available)
|
|
{
|
|
negotiated = WEBSOCKET_TYPE_TEXT;
|
|
break; /* First hit wins */
|
|
}
|
|
}
|
|
if (negotiated == WEBSOCKET_TYPE_BINARY)
|
|
{
|
|
WSU(client)->type = WEBSOCKET_TYPE_BINARY;
|
|
safe_strdup(WSU(client)->sec_websocket_protocol, "binary.ircv3.net");
|
|
} else
|
|
if (negotiated == WEBSOCKET_TYPE_TEXT)
|
|
{
|
|
WSU(client)->type = WEBSOCKET_TYPE_TEXT;
|
|
safe_strdup(WSU(client)->sec_websocket_protocol, "text.ircv3.net");
|
|
} else
|
|
{
|
|
/* Negotiation failed, fallback to the default (don't set it here) */
|
|
safe_free(WSU(client)->sec_websocket_protocol);
|
|
}
|
|
}
|
|
|
|
/* Check forwarded header (by k4be) */
|
|
if (WSU(client)->forwarded)
|
|
{
|
|
struct HTTPForwardedHeader *forwarded;
|
|
char oldip[64];
|
|
|
|
/* check for source ip */
|
|
if (BadPtr(client->local->listener->websocket_forward) || !websocket_ip_compare(client->local->listener->websocket_forward, client->ip))
|
|
{
|
|
unreal_log(ULOG_WARNING, "websocket", "UNAUTHORIZED_FORWARDED_HEADER", client, "Received unauthorized Forwarded header from $ip", log_data_string("ip", client->ip));
|
|
webserver_send_response(client, 403, "Forwarded: no access");
|
|
return 0;
|
|
}
|
|
/* parse the header */
|
|
forwarded = websocket_parse_forwarded_header(WSU(client)->forwarded);
|
|
/* check header values */
|
|
if (!is_valid_ip(forwarded->ip))
|
|
{
|
|
unreal_log(ULOG_WARNING, "websocket", "INVALID_FORWARDED_IP", client, "Received invalid IP in Forwarded header from $ip", log_data_string("ip", client->ip));
|
|
webserver_send_response(client, 400, "Forwarded: invalid IP");
|
|
return 0;
|
|
}
|
|
/* store data */
|
|
WSU(client)->secure = forwarded->secure;
|
|
strlcpy(oldip, client->ip, sizeof(oldip));
|
|
safe_strdup(client->ip, forwarded->ip);
|
|
/* Update client->local->hostp */
|
|
strlcpy(client->local->sockhost, forwarded->ip, sizeof(client->local->sockhost)); /* in case dns lookup fails or is disabled */
|
|
/* (free old) */
|
|
if (client->local->hostp)
|
|
{
|
|
unreal_free_hostent(client->local->hostp);
|
|
client->local->hostp = NULL;
|
|
}
|
|
/* (create new) */
|
|
if (!DONT_RESOLVE)
|
|
{
|
|
/* taken from socket.c */
|
|
struct hostent *he;
|
|
unrealdns_delreq_bycptr(client); /* in case the proxy ip is still in progress of being looked up */
|
|
ClearDNSLookup(client);
|
|
he = unrealdns_doclient(client); /* call this once more */
|
|
if (!client->local->hostp)
|
|
{
|
|
if (he)
|
|
client->local->hostp = he;
|
|
else
|
|
SetDNSLookup(client);
|
|
} else
|
|
{
|
|
/* Race condition detected, DNS has been done, continue with auth */
|
|
}
|
|
}
|
|
RunHook(HOOKTYPE_IP_CHANGE, client, oldip);
|
|
}
|
|
|
|
websocket_handshake_send_response(client);
|
|
return 1;
|
|
}
|
|
|
|
int websocket_secure_connect(Client *client)
|
|
{
|
|
/* Remove secure mode (-z) if the WEBIRC gateway did not ensure
|
|
* us that their [client]--[webirc gateway] connection is also
|
|
* secure (eg: using https)
|
|
*/
|
|
if (IsSecureConnect(client) && websocket_md && WSU(client) && WSU(client)->forwarded && !WSU(client)->secure)
|
|
client->umodes &= ~UMODE_SECURE;
|
|
return 0;
|
|
}
|
|
|
|
/** Complete the handshake by sending the appropriate HTTP 101 response etc. */
|
|
int websocket_handshake_send_response(Client *client)
|
|
{
|
|
char buf[512], hashbuf[64];
|
|
char sha1out[20]; /* 160 bits */
|
|
|
|
WSU(client)->handshake_completed = 1;
|
|
|
|
snprintf(buf, sizeof(buf), "%s%s", WSU(client)->handshake_key, WEBSOCKET_MAGIC_KEY);
|
|
sha1hash_binary(sha1out, buf, strlen(buf));
|
|
b64_encode(sha1out, sizeof(sha1out), hashbuf, sizeof(hashbuf));
|
|
|
|
snprintf(buf, sizeof(buf),
|
|
"HTTP/1.1 101 Switching Protocols\r\n"
|
|
"Upgrade: websocket\r\n"
|
|
"Connection: Upgrade\r\n"
|
|
"Sec-WebSocket-Accept: %s\r\n",
|
|
hashbuf);
|
|
|
|
if (WSU(client)->sec_websocket_protocol)
|
|
{
|
|
/* using strlen() is safe here since above buffer will not
|
|
* cause it to be >=512 and thus we won't get into negatives.
|
|
*/
|
|
snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf),
|
|
"Sec-WebSocket-Protocol: %s\r\n",
|
|
WSU(client)->sec_websocket_protocol);
|
|
}
|
|
|
|
strlcat(buf, "\r\n", sizeof(buf));
|
|
|
|
/* Caution: we bypass sendQ flood checking by doing it this way.
|
|
* Risk is minimal, though, as we only permit limited text only
|
|
* once per session.
|
|
*/
|
|
dbuf_put(&client->local->sendQ, buf, strlen(buf));
|
|
send_queued(client);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** Compare IP addresses (for authorization checking) */
|
|
int websocket_ip_compare(const char *ip1, const char *ip2)
|
|
{
|
|
uint32_t ip4[2];
|
|
uint16_t ip6[16];
|
|
int i;
|
|
if (inet_pton(AF_INET, ip1, &ip4[0]) == 1) /* IPv4 */
|
|
{
|
|
if (inet_pton(AF_INET, ip2, &ip4[1]) == 1) /* both are valid, let's compare */
|
|
{
|
|
return ip4[0] == ip4[1];
|
|
}
|
|
return 0;
|
|
}
|
|
if (inet_pton(AF_INET6, ip1, &ip6[0]) == 1) /* IPv6 */
|
|
{
|
|
if (inet_pton(AF_INET6, ip2, &ip6[8]) == 1)
|
|
{
|
|
for (i = 0; i < 8; i++)
|
|
{
|
|
if (ip6[i] != ip6[i+8])
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
}
|
|
return 0; /* neither valid IPv4 nor IPv6 */
|
|
}
|
|
|