2a64b1e5b9
Before splitting things out into hooks, umode +Rg would only notify the recipient if the sender satisfied +R. This restores that behavior by making the +g hook happen after +R.
411 lines
10 KiB
C
411 lines
10 KiB
C
/*
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* modules/um_callerid.c
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* Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "stdinc.h"
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#include "modules.h"
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#include "hook.h"
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#include "client.h"
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#include "ircd.h"
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#include "send.h"
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#include "hash.h"
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#include "s_conf.h"
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#include "s_user.h"
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#include "s_serv.h"
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#include "numeric.h"
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#include "privilege.h"
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#include "s_newconf.h"
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#include "hook.h"
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#include "supported.h"
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#include "logger.h"
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#define IsSetStrictCallerID(c) ((c->umodes & user_modes['g']) == user_modes['g'])
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#define IsSetRelaxedCallerID(c) ((c->umodes & user_modes['G']) == user_modes['G'])
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#define IsSetAnyCallerID(c) (IsSetStrictCallerID(c) || IsSetRelaxedCallerID(c))
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#define IsSetTalkThroughCallerID(c) ((c->umodes & user_modes['M']) == user_modes['M'])
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static const char um_callerid_desc[] =
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"Provides usermodes +g and +G which restrict messages from unauthorized users.";
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struct CallerIDOverrideSession {
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rb_dlink_node node;
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struct Client *client;
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time_t deadline;
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};
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static rb_dlink_list callerid_overriding_opers = { NULL, NULL, 0 };
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struct ev_entry *expire_callerid_override_deadlines_ev = NULL;
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static void
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update_session_deadline(struct Client *source_p)
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{
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struct CallerIDOverrideSession *session_p = NULL;
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rb_dlink_node *n;
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RB_DLINK_FOREACH(n, callerid_overriding_opers.head)
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{
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struct CallerIDOverrideSession *s = n->data;
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if (s->client == source_p)
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{
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session_p = s;
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break;
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}
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}
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if (session_p != NULL)
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{
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rb_dlinkDelete(&session_p->node, &callerid_overriding_opers);
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}
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else
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{
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session_p = rb_malloc(sizeof(struct CallerIDOverrideSession));
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session_p->client = source_p;
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}
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session_p->deadline = rb_current_time() + 1800;
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rb_dlinkAddTail(session_p, &session_p->node, &callerid_overriding_opers);
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}
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static void
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expire_callerid_override_deadlines(void *unused)
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{
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rb_dlink_node *n, *tn;
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RB_DLINK_FOREACH_SAFE(n, tn, callerid_overriding_opers.head)
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{
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struct CallerIDOverrideSession *session_p = n->data;
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if (session_p->deadline >= rb_current_time())
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{
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break;
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}
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else
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{
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const char *parv[4] = {session_p->client->name, session_p->client->name, "-M", NULL};
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user_mode(session_p->client, session_p->client, 3, parv);
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}
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}
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}
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static bool
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allow_message(struct Client *source_p, struct Client *target_p)
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{
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if (!MyClient(target_p))
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return true;
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if (!IsSetAnyCallerID(target_p))
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return true;
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if (!IsPerson(source_p))
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return true;
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if (IsSetRelaxedCallerID(target_p) &&
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!IsSetStrictCallerID(target_p) &&
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has_common_channel(source_p, target_p))
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return true;
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/* XXX: controversial? allow opers to send through +g */
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if (IsSetTalkThroughCallerID(source_p) || MayHavePrivilege(source_p, "oper:always_message"))
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return true;
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if (accept_message(source_p, target_p))
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return true;
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return false;
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}
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static void
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send_callerid_notice(enum message_type msgtype, struct Client *source_p, struct Client *target_p)
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{
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if (!MyClient(target_p))
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return;
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if (msgtype == MESSAGE_TYPE_NOTICE)
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return;
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sendto_one_numeric(source_p, ERR_TARGUMODEG, form_str(ERR_TARGUMODEG),
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target_p->name, IsSetStrictCallerID(target_p) ? "+g" : "+G");
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if ((target_p->localClient->last_caller_id_time + ConfigFileEntry.caller_id_wait) < rb_current_time())
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{
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sendto_one_numeric(source_p, RPL_TARGNOTIFY, form_str(RPL_TARGNOTIFY),
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target_p->name);
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sendto_one(target_p, form_str(RPL_UMODEGMSG),
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me.name, target_p->name, source_p->name,
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source_p->username, source_p->host, IsSetStrictCallerID(target_p) ? "+g" : "+G");
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target_p->localClient->last_caller_id_time = rb_current_time();
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}
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}
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static bool
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add_callerid_accept_for_source(enum message_type msgtype, struct Client *source_p, struct Client *target_p)
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{
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/* only do this on source_p's server */
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if (!MyClient(source_p))
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return true;
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/*
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* XXX: Controversial? Allow target users to send replies
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* through a +g. Rationale is that people can presently use +g
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* as a way to taunt users, e.g. harass them and hide behind +g
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* as a way of griefing. --nenolod
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*/
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if(msgtype != MESSAGE_TYPE_NOTICE &&
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IsSetAnyCallerID(source_p) &&
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!accept_message(target_p, source_p) &&
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!MayHavePrivilege(source_p, "oper:always_message"))
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{
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if(rb_dlink_list_length(&source_p->localClient->allow_list) <
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(unsigned long)ConfigFileEntry.max_accept)
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{
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rb_dlinkAddAlloc(target_p, &source_p->localClient->allow_list);
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rb_dlinkAddAlloc(source_p, &target_p->on_allow_list);
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}
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else
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{
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sendto_one_numeric(source_p, ERR_OWNMODE,
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form_str(ERR_OWNMODE),
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target_p->name, IsSetStrictCallerID(target_p) ? "+g" : "+G");
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return false;
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}
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}
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return true;
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}
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static void
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h_hdl_invite(void *vdata)
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{
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hook_data_channel_approval *data = vdata;
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struct Client *source_p = data->client;
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struct Client *target_p = data->target;
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static char errorbuf[BUFSIZE];
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if (data->approved)
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return;
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if (!add_callerid_accept_for_source(MESSAGE_TYPE_PRIVMSG, source_p, target_p))
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{
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data->approved = ERR_TARGUMODEG;
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return;
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}
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if (allow_message(source_p, target_p))
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return;
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snprintf(errorbuf, sizeof errorbuf, form_str(ERR_TARGUMODEG),
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target_p->name, IsSetStrictCallerID(target_p) ? "+g" : "+G");
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data->approved = ERR_TARGUMODEG;
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data->error = errorbuf;
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}
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static void
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h_hdl_privmsg_user(void *vdata)
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{
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hook_data_privmsg_user *data = vdata;
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enum message_type msgtype = data->msgtype;
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struct Client *source_p = data->source_p;
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struct Client *target_p = data->target_p;
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if (data->approved)
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return;
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if (!add_callerid_accept_for_source(msgtype, source_p, target_p))
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{
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data->approved = ERR_TARGUMODEG;
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return;
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}
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if (allow_message(source_p, target_p))
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return;
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send_callerid_notice(msgtype, source_p, target_p);
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data->approved = ERR_TARGUMODEG;
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}
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static void
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check_umode_change(void *vdata)
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{
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hook_data_umode_changed *data = (hook_data_umode_changed *)vdata;
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bool changed = false;
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struct Client *source_p = data->client;
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if (!MyClient(source_p))
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return;
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if (data->oldumodes & UMODE_OPER && !IsOper(source_p))
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source_p->umodes &= ~user_modes['M'];
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changed = ((data->oldumodes ^ source_p->umodes) & user_modes['M']);
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if (changed && source_p->umodes & user_modes['M'])
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{
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if (!HasPrivilege(source_p, "oper:message"))
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{
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sendto_one_notice(source_p, ":*** You need oper:message privilege for +M");
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source_p->umodes &= ~user_modes['M'];
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return;
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}
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update_session_deadline(source_p);
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}
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else if (changed)
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{
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// Unsetting +M; remove the timeout session
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rb_dlink_node *n, *tn;
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RB_DLINK_FOREACH_SAFE(n, tn, callerid_overriding_opers.head)
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{
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struct CallerIDOverrideSession *session_p = n->data;
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if (session_p->client != source_p)
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continue;
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rb_dlinkDelete(n, &callerid_overriding_opers);
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rb_free(session_p);
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}
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}
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}
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static void check_priv_change(void *vdata)
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{
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hook_data_priv_change *data = (hook_data_priv_change*)vdata;
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struct Client *source_p = data->client;
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const char *fakeparv[4];
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if (!MyClient(source_p))
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return;
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if (source_p->umodes & user_modes['M'] && !HasPrivilege(source_p, "oper:message"))
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{
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sendto_one_notice(source_p, ":*** You need oper:message privilege for +M");
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fakeparv[0] = fakeparv[1] = source_p->name;
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fakeparv[2] = "-M";
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fakeparv[3] = NULL;
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user_mode(source_p, source_p, 3, fakeparv);
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}
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}
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static void
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handle_client_exit(void *vdata)
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{
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hook_data_client_exit *data = (hook_data_client_exit *) vdata;
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rb_dlink_node *n, *tn;
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struct Client *source_p = data->target;
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RB_DLINK_FOREACH_SAFE(n, tn, callerid_overriding_opers.head)
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{
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struct CallerIDOverrideSession *session_p = n->data;
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if (session_p->client != source_p)
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continue;
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rb_dlinkDelete(n, &callerid_overriding_opers);
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rb_free(session_p);
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}
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}
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static mapi_hfn_list_av1 um_callerid_hfnlist[] = {
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{ "umode_changed", check_umode_change },
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{ "priv_change", check_priv_change },
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{ "invite", h_hdl_invite, HOOK_HIGH },
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{ "privmsg_user", h_hdl_privmsg_user, HOOK_HIGH },
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{ "client_exit", handle_client_exit },
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{ NULL, NULL }
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};
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static int
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um_callerid_modinit(void)
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{
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rb_dlink_node *ptr;
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user_modes['g'] = find_umode_slot();
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if (!user_modes['g'])
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{
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ierror("um_callerid: unable to allocate usermode slot for +g; unloading module.");
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return -1;
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}
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user_modes['G'] = find_umode_slot();
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if (!user_modes['G'])
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{
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user_modes['g'] = 0;
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ierror("um_callerid: unable to allocate usermode slot for +G; unloading module.");
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return -1;
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}
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user_modes['M'] = find_umode_slot();
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if (!user_modes['M'])
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{
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user_modes['g'] = 0;
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user_modes['G'] = 0;
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ierror("um_callerid: unable to allocate usermode slot for +M; unloading module.");
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return -1;
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}
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construct_umodebuf();
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add_isupport("CALLERID", isupport_umode, "g");
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RB_DLINK_FOREACH(ptr, lclient_list.head)
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{
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struct Client *client_p = ptr->data;
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if (IsPerson(client_p) && (client_p->umodes & user_modes['M']))
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update_session_deadline(client_p);
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}
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expire_callerid_override_deadlines_ev = rb_event_add("expire_callerid_override_deadlines", expire_callerid_override_deadlines, NULL, 60);
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return 0;
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}
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static void
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um_callerid_moddeinit(void)
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{
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user_modes['g'] = 0;
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user_modes['G'] = 0;
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user_modes['M'] = 0;
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construct_umodebuf();
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delete_isupport("CALLERID");
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rb_event_delete(expire_callerid_override_deadlines_ev);
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}
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DECLARE_MODULE_AV2(um_callerid, um_callerid_modinit, um_callerid_moddeinit,
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NULL, NULL, um_callerid_hfnlist, NULL, NULL, um_callerid_desc);
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