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SystemServer: Port to Core::Account

Browse source 
We now have a handy Core::Account class that we can use instead of iterating
over the passwd database ourselves.
This commit is contained in:
Sergey Bugaev 2020-12-26 15:12:49 +03:00 committed by Andreas Kling
parent 7babe5ade6
commit 95157f8b81
Notes: sideshowbarker 2024-07-19 00:35:03 +09:00 
Author: https://github.com/bugaevc
Commit: https://github.com/SerenityOS/serenity/commit/95157f8b818
Pull-request: https://github.com/SerenityOS/serenity/pull/4548
2 changed files with 21 additions and 49 deletions
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62
Services/SystemServer/Service.cpp
View file

@ -40,43 +40,8 @@
#include <sys/stat.h>
#include <unistd.h>
struct UidAndGids {
uid_t uid;
gid_t gid;
Vector<gid_t> extra_gids;
};
static HashMap<String, UidAndGids>* s_user_map;
static HashMap<pid_t, Service*> s_service_map;
void Service::resolve_user()
{
if (s_user_map == nullptr) {
s_user_map = new HashMap<String, UidAndGids>;
for (struct passwd* passwd = getpwent(); passwd; passwd = getpwent()) {
Vector<gid_t> extra_gids;
for (struct group* group = getgrent(); group; group = getgrent()) {
for (size_t m = 0; group->gr_mem[m]; ++m) {
if (!strcmp(group->gr_mem[m], passwd->pw_name))
extra_gids.append(group->gr_gid);
}
}
endgrent();
s_user_map->set(passwd->pw_name, { passwd->pw_uid, passwd->pw_gid, move(extra_gids) });
}
endpwent();
}
auto user = s_user_map->get(m_user);
if (!user.has_value()) {
dbg() << "Failed to resolve user name " << m_user;
ASSERT_NOT_REACHED();
}
m_uid = user.value().uid;
m_gid = user.value().gid;
m_extra_gids = user.value().extra_gids;
}
Service* Service::find_by_pid(pid_t pid)
{
auto it = s_service_map.find(pid);
@ -102,9 +67,12 @@ void Service::setup_socket()
ASSERT_NOT_REACHED();
}
if (fchown(m_socket_fd, m_uid, m_gid) < 0) {
perror("fchown");
ASSERT_NOT_REACHED();
if (m_account.has_value()) {
auto& account = m_account.value();
if (fchown(m_socket_fd, account.uid(), account.gid()) < 0) {
perror("fchown");
ASSERT_NOT_REACHED();
}
}
if (fchmod(m_socket_fd, m_socket_permissions) < 0) {
@ -240,9 +208,10 @@ void Service::spawn(int socket_fd)
setenv("SOCKET_TAKEOVER", "1", true);
}
if (!m_user.is_null()) {
if (setgid(m_gid) < 0 || setgroups(m_extra_gids.size(), m_extra_gids.data()) < 0 || setuid(m_uid) < 0) {
dbgprintf("Failed to drop privileges (GID=%u, UID=%u)\n", m_gid, m_uid);
if (m_account.has_value()) {
auto& account = m_account.value();
if (setgid(account.gid()) < 0 || setgroups(account.extra_gids().size(), account.extra_gids().data()) < 0 || setuid(account.uid()) < 0) {
dbgprintf("Failed to drop privileges (GID=%u, UID=%u)\n", account.gid(), account.uid());
exit(1);
}
}
@ -324,8 +293,13 @@ Service::Service(const Core::ConfigFile& config, const StringView& name)
m_lazy = config.read_bool_entry(name, "Lazy");
m_user = config.read_entry(name, "User");
if (!m_user.is_null())
resolve_user();
if (!m_user.is_null()) {
auto result = Core::Account::from_name(m_user.characters());
if (result.is_error())
warnln("Failed to resolve user {}: {}", m_user, result.error());
else
m_account = result.value();
}
m_working_directory = config.read_entry(name, "WorkingDirectory");
m_environment = config.read_entry(name, "Environment").split(' ');
@ -382,8 +356,6 @@ void Service::save_to(JsonObject& json)
json.set("socket_permissions", m_socket_permissions);
json.set("lazy", m_lazy);
json.set("user", m_user);
json.set("uid", m_uid);
json.set("gid", m_gid);
json.set("multi_instance", m_multi_instance);
json.set("accept_socket_connections", m_accept_socket_connections);

8
Services/SystemServer/Service.h
View file

@ -28,6 +28,7 @@
#include <AK/RefPtr.h>
#include <AK/String.h>
#include <LibCore/Account.h>
#include <LibCore/ElapsedTimer.h>
#include <LibCore/Notifier.h>
#include <LibCore/Object.h>
@ -71,9 +72,6 @@ private:
bool m_lazy;
// The name of the user we should run this service as.
String m_user;
uid_t m_uid { 0 };
gid_t m_gid { 0 };
Vector<gid_t> m_extra_gids;
// The working directory in which to spawn the service.
String m_working_directory;
// Boot modes to run this service in. By default, this is the graphical mode.
@ -83,6 +81,9 @@ private:
// Environment variables to pass to the service.
Vector<String> m_environment;
// The resolved user account to run this service as.
Optional<Core::Account> m_account;
// For single-instance services, PID of the running instance of this service.
pid_t m_pid { -1 };
// An open fd to the socket.
@ -95,7 +96,6 @@ private:
// times where it has exited unsuccessfully and too quickly.
int m_restart_attempts { 0 };
void resolve_user();
void setup_socket();
void setup_notifier();
void handle_socket_connection();