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/*
* Copyright (C) 2004-2025 ZNC, see the NOTICE file for details.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <znc/User.h>
#include <znc/IRCNetwork.h>
using std::vector;
#define MESSAGE \
t_s("Your account has been disabled. Contact your administrator.")
class CBlockUser : public CModule {
public:
MODCONSTRUCTOR(CBlockUser) {
AddHelpCommand();
AddCommand("List", "", t_d("List blocked users"),
[this](const CString& sLine) { OnListCommand(sLine); });
AddCommand("Block", t_d("<user>"), t_d("Block a user"),
[this](const CString& sLine) { OnBlockCommand(sLine); });
AddCommand("Unblock", t_d("<user>"), t_d("Unblock a user"),
[this](const CString& sLine) { OnUnblockCommand(sLine); });
}
~CBlockUser() override {}
bool OnLoad(const CString& sArgs, CString& sMessage) override {
VCString vArgs;
VCString::iterator it;
MCString::iterator it2;
// Load saved settings
for (it2 = BeginNV(); it2 != EndNV(); ++it2) {
// Ignore errors
Block(it2->first);
}
// Parse arguments, each argument is a user name to block
sArgs.Split(" ", vArgs, false);
for (it = vArgs.begin(); it != vArgs.end(); ++it) {
if (!Block(*it)) {
sMessage = t_f("Could not block {1}")(*it);
return false;
}
}
return true;
}
/* If a user is on the blocked list and tries to log in, displays - MESSAGE
and stops their log in attempt.*/
EModRet OnLoginAttempt(std::shared_ptr<CAuthBase> Auth) override {
if (IsBlocked(Auth->GetUsername())) {
Auth->RefuseLogin(MESSAGE);
return HALT;
}
return CONTINUE;
}
void OnModCommand(const CString& sCommand) override {
if (!GetUser()->IsAdmin()) {
PutModule(t_s("Access denied"));
} else {
HandleCommand(sCommand);
}
}
// Displays all blocked users as a list.
void OnListCommand(const CString& sCommand) {
if (BeginNV() == EndNV()) {
PutModule(t_s("No users are blocked"));
return;
}
PutModule(t_s("Blocked users:"));
for (auto it = BeginNV(); it != EndNV(); ++it) {
PutModule(it->first);
}
}
/* Blocks a user if possible(ie not self, not already blocked).
Displays an error message if not possible. */
void OnBlockCommand(const CString& sCommand) {
CString sUser = sCommand.Token(1, true);
if (sUser.empty()) {
PutModule(t_s("Usage: Block <user>"));
return;
}
if (GetUser()->GetUsername().Equals(sUser)) {
PutModule(t_s("You can't block yourself"));
return;
}
if (Block(sUser))
PutModule(t_f("Blocked {1}")(sUser));
else
PutModule(t_f("Could not block {1} (misspelled?)")(sUser));
}
// Unblocks a user from the blocked list.
void OnUnblockCommand(const CString& sCommand) {
CString sUser = sCommand.Token(1, true);
if (sUser.empty()) {
PutModule(t_s("Usage: Unblock <user>"));
return;
}
if (DelNV(sUser))
PutModule(t_f("Unblocked {1}")(sUser));
else
PutModule(t_s("This user is not blocked"));
}
// Provides GUI to configure this module by adding a widget to user page in webadmin.
bool OnEmbeddedWebRequest(CWebSock& WebSock, const CString& sPageName,
CTemplate& Tmpl) override {
if (sPageName == "webadmin/user" && WebSock.GetSession()->IsAdmin()) {
CString sAction = Tmpl["WebadminAction"];
if (sAction == "display") {
Tmpl["Blocked"] = CString(IsBlocked(Tmpl["Username"]));
Tmpl["Self"] = CString(Tmpl["Username"].Equals(
WebSock.GetSession()->GetUser()->GetUsername()));
return true;
}
if (sAction == "change" &&
WebSock.GetParam("embed_blockuser_presented").ToBool()) {
if (Tmpl["Username"].Equals(
WebSock.GetSession()->GetUser()->GetUsername()) &&
WebSock.GetParam("embed_blockuser_block").ToBool()) {
WebSock.GetSession()->AddError(
t_s("You can't block yourself"));
} else if (WebSock.GetParam("embed_blockuser_block").ToBool()) {
if (!WebSock.GetParam("embed_blockuser_old").ToBool()) {
if (Block(Tmpl["Username"])) {
WebSock.GetSession()->AddSuccess(
t_f("Blocked {1}")(Tmpl["Username"]));
} else {
WebSock.GetSession()->AddError(
t_f("Couldn't block {1}")(Tmpl["Username"]));
}
}
} else if (WebSock.GetParam("embed_blockuser_old").ToBool()) {
if (DelNV(Tmpl["Username"])) {
WebSock.GetSession()->AddSuccess(
t_f("Unblocked {1}")(Tmpl["Username"]));
} else {
WebSock.GetSession()->AddError(
t_f("User {1} is not blocked")(Tmpl["Username"]));
}
}
return true;
}
}
return false;
}
private:
/* Iterates through all blocked users and returns true if the specified user (sUser)
is blocked, else returns false.*/
bool IsBlocked(const CString& sUser) {
MCString::iterator it;
for (it = BeginNV(); it != EndNV(); ++it) {
if (sUser == it->first) {
return true;
}
}
return false;
}
bool Block(const CString& sUser) {
CUser* pUser = CZNC::Get().FindUser(sUser);
if (!pUser) return false;
// Disconnect all clients
vector<CClient*> vpClients = pUser->GetAllClients();
vector<CClient*>::iterator it;
for (it = vpClients.begin(); it != vpClients.end(); ++it) {
(*it)->PutStatusNotice(MESSAGE);
(*it)->Close(Csock::CLT_AFTERWRITE);
}
// Disconnect all networks from irc
vector<CIRCNetwork*> vNetworks = pUser->GetNetworks();
for (vector<CIRCNetwork*>::iterator it2 = vNetworks.begin();
it2 != vNetworks.end(); ++it2) {
(*it2)->SetIRCConnectEnabled(false);
}
SetNV(pUser->GetUsername(), "");
return true;
}
};
template <>
void TModInfo<CBlockUser>(CModInfo& Info) {
Info.SetWikiPage("blockuser");
Info.SetHasArgs(true);
Info.SetArgsHelpText(
Info.t_s("Enter one or more user names. Separate them by spaces."));
}
GLOBALMODULEDEFS(CBlockUser, t_s("Block certain users from logging in."))
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