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Restrict socket connections #9779
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,154 @@ | ||
| /* | ||
| * Copyright (C) 2023 KeePassXC Team <team@keepassxc.org> | ||
| * | ||
| * This program 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, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * 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 "BrowserClientRestrictions.h" | ||
| #include "core/FileHash.h" | ||
| #include "core/Metadata.h" | ||
| #include <QCryptographicHash> | ||
|
|
||
| #ifdef Q_OS_MACOS | ||
| #include <libproc.h> | ||
| #include <sys/un.h> | ||
| #elif Q_OS_LINUX | ||
| #include <limits.h> | ||
| #elif Q_OS_WIN | ||
| #include <psapi.h> | ||
| #elif Q_OS_FREEBSD | ||
| #include <sys/socket.h> | ||
| #include <sys/types.h> | ||
| #include <sys/ucred.h> | ||
| #include <sys/un.h> | ||
| #include <sys/sysctl.h> | ||
| #endif | ||
|
|
||
| bool BrowserClientRestrictions::isClientProcessAllowed(const QSharedPointer<Database>& db, | ||
| const ClientProcess& clientProcess) | ||
| { | ||
| for (const auto& key : db->metadata()->customData()->keys()) { | ||
| if (key.startsWith(CustomData::OptionPrefix + CustomData::BrowserAllowedProcessPrefix)) { | ||
| auto strippedKey = key; | ||
| strippedKey.remove(CustomData::OptionPrefix + CustomData::BrowserAllowedProcessPrefix); | ||
|
|
||
| const auto value = db->metadata()->customData()->value(key); | ||
| if (strippedKey == clientProcess.hash && value == clientProcess.path) { | ||
| return true; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return false; | ||
| } | ||
|
|
||
| ClientProcess BrowserClientRestrictions::getProcessPathAndHash(QLocalSocket* socket) | ||
| { | ||
| if (!socket) { | ||
| return {}; | ||
| } | ||
|
|
||
| ClientProcess clientProcess; | ||
| int socketDesc = socket->socketDescriptor(); | ||
|
|
||
| #ifdef Q_OS_MACOS | ||
| pid_t pid; | ||
| socklen_t pidSize = sizeof(pid); | ||
| auto ret = getsockopt(socketDesc, SOL_LOCAL, LOCAL_PEERPID, &pid, &pidSize); | ||
| if (ret == -1) { | ||
| return {}; | ||
| } | ||
|
|
||
| char fullPath[PROC_PIDPATHINFO_MAXSIZE]; | ||
| ret = proc_pidpath(pid, fullPath, sizeof(fullPath)); | ||
| if (ret <= 0) { | ||
| return {}; | ||
| } | ||
|
|
||
| clientProcess.path = fullPath; | ||
| #elif Q_OS_WIN | ||
| ULONG pid = 0; | ||
| HANDLE socketHandle = reinterpret_cast<HANDLE>(socketDesc); | ||
| auto res = GetNamedPipeClientProcessId(socketHandle, &pid); | ||
| if (res == 0) { | ||
| return {}; | ||
| } | ||
|
|
||
| HANDLE processHandle = NULL; | ||
| processHandle = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, pid); | ||
| if (!processHandle) { | ||
| return {}; | ||
| } | ||
|
|
||
| TCHAR fullPath[MAX_PATH]; | ||
| if (GetModuleFileNameEx(processHandle, NULL, fullPath, MAX_PATH) == 0) { | ||
| return {}; | ||
| } | ||
|
|
||
| CloseHandle(processHandle); | ||
| clientProcess.path = fullPath; | ||
| #elif Q_OS_LINUX | ||
| pid_t pid; | ||
| socklen_t pidSize = sizeof(pid); | ||
| auto ret = getsockopt(socketDesc, SOL_SOCKET, SO_PEERCRED, &pid, &pidSize); | ||
| if (ret == -1) { | ||
| return {}; | ||
| } | ||
|
|
||
| // Get process path from PID | ||
| char buf[PATH_MAX]; | ||
| auto procPath = QString("/proc/%1/exe").arg(pid); | ||
| auto fullPath = realpath(procPath.toStdString().c_str(), buf); | ||
| if (!fullPath) { | ||
| return {}; | ||
| } | ||
|
|
||
| clientProcess.path = fullPath; | ||
| #elif Q_OS_FREEBSD | ||
| struct xucred xucred; | ||
| socklen_t xucredSize = sizeof(xucred); | ||
| auto ret = getsockopt(socketDesc, SOL_LOCAL, LOCAL_PEERCRED, &xucred, &xucredSize); | ||
| if (ret < 0) { | ||
| return {}; | ||
| } | ||
|
|
||
| int mib[4]; | ||
| mib[0] = CTL_KERN; | ||
| mib[1] = KERN_PROC; | ||
| mib[2] = KERN_PROC_PATHNAME; | ||
| mib[3] = xucred.cr_pid; | ||
| size_t bufSize; | ||
|
|
||
| auto res = sysctl(mib, 4, nullptr, &bufSize, nullptr, 0); | ||
| if (res < 0) { | ||
| return {}; | ||
| } | ||
|
|
||
| char buf[bufSize + 1]; | ||
| res = sysctl(mib, 4, &buf, &bufSize, nullptr, 0); | ||
| if (res < 0) { | ||
| return {}; | ||
| } | ||
|
|
||
| clientProcess.path = buf; | ||
| #else | ||
|
|
||
| #endif | ||
| if (clientProcess.path.isEmpty()) { | ||
| return {}; | ||
| } | ||
|
|
||
| clientProcess.hash = FileHash::getFileHash(clientProcess.path, QCryptographicHash::Md5, 8192); | ||
| return clientProcess; | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| /* | ||
| * Copyright (C) 2023 KeePassXC Team <team@keepassxc.org> | ||
| * | ||
| * This program 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, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * 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/>. | ||
| */ | ||
|
|
||
| #ifndef BROWSERCLIENTRESTRICTIONS_H | ||
| #define BROWSERCLIENTRESTRICTIONS_H | ||
|
|
||
| #include "core/Database.h" | ||
| #include <QLocalSocket> | ||
|
|
||
| struct ClientProcess | ||
| { | ||
| QString path; | ||
| QString hash; | ||
| }; | ||
|
|
||
| class BrowserClientRestrictions | ||
| { | ||
| public: | ||
| explicit BrowserClientRestrictions() = default; | ||
|
|
||
| static bool isClientProcessAllowed(const QSharedPointer<Database>& db, const ClientProcess& clientProcess); | ||
| static ClientProcess getProcessPathAndHash(QLocalSocket* socket); | ||
| }; | ||
|
|
||
| #endif // BROWSERCLIENTRESTRICTIONS_H |
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IIRC, FdoSecrets does something similar for its client authorization. You can search its code for "proc" to find where that is. This should probably be moved to a common function in OSutils.
This whole PR is similar in concept to #6458, so there is likely to be some common functionality. Maybe a
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OSUtils is a fine place for this, yes. And I agree common functions should have just one class. Going to look at this again after those two required PR's for this one are merged.