1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2018 linuxdaemon <linuxdaemon.irc@gmail.com>
* Copyright (C) 2013, 2018, 2020 Sadie Powell <sadie@witchery.services>
* Copyright (C) 2012-2013, 2016 Attila Molnar <attilamolnar@hush.com>
* Copyright (C) 2012, 2019 Robby <robby@chatbelgie.be>
* Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2007-2008 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
* Copyright (C) 2006-2008, 2010 Craig Edwards <brain@inspircd.org>
*
* This file is part of InspIRCd. InspIRCd is free software: you can
* redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "inspircd.h"
#include "modules/account.h"
#include "modules/isupport.h"
typedef std::vector<std::string> AllowList;
class ModuleSecureList final
: public Module
, public ISupport::EventListener
{
private:
AllowList allowlist;
bool exemptregistered;
unsigned long fakechans;
std::string fakechanprefix;
std::string fakechantopic;
bool showmsg;
unsigned long waittime;
public:
ModuleSecureList()
: Module(VF_VENDOR, "Prevents users from using the /LIST command until a predefined period has passed.")
, ISupport::EventListener(this)
{
}
void ReadConfig(ConfigStatus& status) override
{
AllowList newallows;
for (const auto& [_, tag] : ServerInstance->Config->ConfTags("securehost"))
{
const std::string host = tag->getString("exception");
if (host.empty())
throw ModuleException("<securehost:exception> is a required field at " + tag->source.str());
newallows.push_back(host);
}
auto tag = ServerInstance->Config->ConfValue("securelist");
exemptregistered = tag->getBool("exemptregistered", true);
fakechans = tag->getUInt("fakechans", 5, 0);
fakechanprefix = tag->getString("fakechanprefix", "#", 1, ServerInstance->Config->Limits.MaxChannel - 1);
fakechantopic = tag->getString("fakechantopic", "Fake channel for confusing spambots", 1, ServerInstance->Config->Limits.MaxTopic - 1);
showmsg = tag->getBool("showmsg", true);
waittime = tag->getDuration("waittime", 60, 1, UINT_MAX);
allowlist.swap(newallows);
}
ModResult OnPreCommand(std::string& command, CommandBase::Params& parameters, LocalUser* user, bool validated) override
{
// Ignore unless the command is a validated LIST command.
if (!validated || command != "LIST")
return MOD_RES_PASSTHRU;
// Allow if the wait time has passed.
time_t maxwaittime = user->signon + waittime;
if (ServerInstance->Time() > maxwaittime || user->HasPrivPermission("servers/ignore-securelist"))
return MOD_RES_PASSTHRU;
// Allow if the source matches an <securehost> entry.
for (const auto& allowhost : allowlist)
{
if (InspIRCd::Match(user->MakeHost(), allowhost, ascii_case_insensitive_map))
return MOD_RES_PASSTHRU;
if (InspIRCd::Match(user->MakeHostIP(), allowhost, ascii_case_insensitive_map))
return MOD_RES_PASSTHRU;
}
// Allow if the source is logged in and <securelist:exemptregistered> is set.
const AccountExtItem* ext = GetAccountExtItem();
if (exemptregistered && ext && ext->Get(user))
return MOD_RES_PASSTHRU;
// If <securehost:showmsg> is set then tell the user that they need to wait.
if (showmsg)
{
user->WriteNotice(InspIRCd::Format("*** You cannot view the channel list right now. Please %stry again in %s.",
exemptregistered ? "log in to an account or " : "",
InspIRCd::DurationString(maxwaittime - ServerInstance->Time()).c_str()));
}
// The client might be waiting on a response to do something so send them an
// fake list response to satisfy that.
size_t maxfakesuffix = ServerInstance->Config->Limits.MaxChannel - fakechanprefix.size();
user->WriteNumeric(RPL_LISTSTART, "Channel", "Users Name");
for (unsigned long fakechan = 0; fakechan < fakechans; ++fakechan)
{
// Generate the fake channel name.
unsigned long chansuffixsize = ServerInstance->GenRandomInt(maxfakesuffix) + 1;
const std::string chansuffix = ServerInstance->GenRandomStr(chansuffixsize);
// Generate the fake channel size.
unsigned long chanusers = ServerInstance->GenRandomInt(ServerInstance->Users.GetUsers().size()) + 1;
// Generate the fake channel topic.
std::string chantopic(fakechantopic);
chantopic.insert(ServerInstance->GenRandomInt(chantopic.size()), 1, "\x02\x1D\x11\x1E\x1F"[fakechan % 5]);
// Send the fake channel list entry.
user->WriteNumeric(RPL_LIST, fakechanprefix + chansuffix, chanusers, chantopic);
}
user->WriteNumeric(RPL_LISTEND, "End of channel list.");
return MOD_RES_DENY;
}
void OnBuildISupport(ISupport::TokenMap& tokens) override
{
if (showmsg)
tokens["SECURELIST"] = ConvToStr(waittime);
}
};
MODULE_INIT(ModuleSecureList)
|
