ladybird/Userland/Utilities/usermod.cpp
Shannon Booth e2e7c4d574 Everywhere: Use to_number<T> instead of to_{int,uint,float,double}
In a bunch of cases, this actually ends up simplifying the code as
to_number will handle something such as:

```
Optional<I> opt;
if constexpr (IsSigned<I>)
    opt = view.to_int<I>();
else
    opt = view.to_uint<I>();
```

For us.

The main goal here however is to have a single generic number conversion
API between all of the String classes.
2023-12-23 20:41:07 +01:00

213 lines
7.5 KiB
C++

/*
* Copyright (c) 2021, Brandon Pruitt <brapru@pm.me>
* Copyright (c) 2023, Tim Ledbetter <timledbetter@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibCore/Account.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/System.h>
#include <LibFileSystem/FileSystem.h>
#include <LibMain/Main.h>
#include <pwd.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
static Optional<gid_t> group_string_to_gid(StringView group)
{
auto maybe_gid = group.to_number<gid_t>();
auto maybe_group_or_error = maybe_gid.has_value()
? Core::System::getgrgid(maybe_gid.value())
: Core::System::getgrnam(group);
if (maybe_group_or_error.is_error()) {
warnln("Error resolving group '{}': {}", group, maybe_group_or_error.release_error());
return {};
}
auto maybe_group = maybe_group_or_error.release_value();
if (!maybe_group.has_value()) {
warnln("Group '{}' does not exist", group);
return {};
}
return maybe_group->gr_gid;
}
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
TRY(Core::System::pledge("stdio wpath rpath cpath fattr tty"));
TRY(Core::System::unveil("/etc", "rwc"));
uid_t uid = 0;
bool append_extra_gids = false;
Optional<gid_t> gid;
bool lock = false;
bool remove_extra_gids = false;
bool unlock = false;
StringView new_home_directory;
bool move_home = false;
StringView shell;
StringView gecos;
StringView username;
Vector<gid_t> extra_gids;
auto args_parser = Core::ArgsParser();
args_parser.set_general_help("Modify a user account");
args_parser.add_option(append_extra_gids, "Append the supplementary groups specified with the -G option to the user", "append", 'a');
args_parser.add_option(uid, "The new numerical value of the user's ID", "uid", 'u', "uid");
args_parser.add_option(Core::ArgsParser::Option {
.argument_mode = Core::ArgsParser::OptionArgumentMode::Required,
.help_string = "The group name or number of the user's new initial login group",
.long_name = "gid",
.short_name = 'g',
.value_name = "group",
.accept_value = [&gid](StringView group) {
if (auto maybe_gid = group_string_to_gid(group); maybe_gid.has_value())
gid = move(maybe_gid);
return gid.has_value();
},
});
args_parser.add_option(Core::ArgsParser::Option {
.argument_mode = Core::ArgsParser::OptionArgumentMode::Required,
.help_string = "Set the user's supplementary groups. Groups are specified with a comma-separated list. Group names or numbers may be used",
.long_name = "groups",
.short_name = 'G',
.value_name = "groups",
.accept_value = [&extra_gids](StringView comma_separated_groups) {
auto groups = comma_separated_groups.split_view(',');
for (auto group : groups) {
if (auto gid = group_string_to_gid(group); gid.has_value())
extra_gids.append(gid.value());
}
return true;
},
});
args_parser.add_option(lock, "Lock password", "lock", 'L');
args_parser.add_option(remove_extra_gids, "Remove the supplementary groups specified with the -G option from the user", "remove", 'r');
args_parser.add_option(unlock, "Unlock password", "unlock", 'U');
args_parser.add_option(new_home_directory, "The user's new login directory", "home", 'd', "new-home");
args_parser.add_option(move_home, "Move the content of the user's home directory to the new location", "move", 'm');
args_parser.add_option(shell, "The name of the user's new login shell", "shell", 's', "path-to-shell");
args_parser.add_option(gecos, "Change the GECOS field of the user", "gecos", 'n', "general-info");
args_parser.add_positional_argument(username, "Username of the account to modify", "username");
args_parser.parse(arguments);
if (extra_gids.is_empty() && (append_extra_gids || remove_extra_gids)) {
warnln("The -a and -r options can only be used with the -G option");
args_parser.print_usage(stderr, arguments.strings[0]);
return 1;
}
if (append_extra_gids && remove_extra_gids) {
warnln("The -a and -r options are mutually exclusive");
args_parser.print_usage(stderr, arguments.strings[0]);
return 1;
}
if (lock && unlock) {
warnln("The -L and -U options are mutually exclusive");
args_parser.print_usage(stderr, arguments.strings[0]);
return 1;
}
auto account_or_error = Core::Account::from_name(username);
if (account_or_error.is_error()) {
warnln("usermod: {}", strerror(account_or_error.error().code()));
return 1;
}
// target_account is the account we are modifying.
auto& target_account = account_or_error.value();
if (move_home) {
TRY(Core::System::unveil(target_account.home_directory(), "c"sv));
TRY(Core::System::unveil(new_home_directory, "wc"sv));
}
unveil(nullptr, nullptr);
if (uid) {
if (getpwuid(uid)) {
warnln("uid {} already exists", uid);
return 1;
}
target_account.set_uid(uid);
}
if (gid.has_value())
target_account.set_gid(gid.value());
if (lock) {
target_account.set_password_enabled(false);
}
if (unlock) {
target_account.set_password_enabled(true);
}
if (!new_home_directory.is_empty()) {
if (move_home) {
auto maybe_error = Core::System::rename(target_account.home_directory(), new_home_directory);
if (maybe_error.is_error()) {
if (maybe_error.error().code() == EXDEV) {
auto result = FileSystem::copy_file_or_directory(
new_home_directory, target_account.home_directory(),
FileSystem::RecursionMode::Allowed,
FileSystem::LinkMode::Disallowed,
FileSystem::AddDuplicateFileMarker::No);
if (result.is_error()) {
warnln("usermod: could not move directory {} : {}", target_account.home_directory().characters(), static_cast<Error const&>(result.error()));
return 1;
}
maybe_error = Core::System::unlink(target_account.home_directory());
if (maybe_error.is_error())
warnln("usermod: unlink {} : {}", target_account.home_directory(), maybe_error.error().code());
} else {
warnln("usermod: could not move directory {} : {}", target_account.home_directory(), maybe_error.error().code());
}
}
}
target_account.set_home_directory(new_home_directory);
}
if (!shell.is_empty()) {
target_account.set_shell(shell);
}
if (!gecos.is_empty()) {
target_account.set_gecos(gecos);
}
if (append_extra_gids) {
for (auto gid : target_account.extra_gids())
extra_gids.append(gid);
}
if (remove_extra_gids) {
Vector<gid_t> current_extra_gids = target_account.extra_gids();
for (auto gid : extra_gids)
current_extra_gids.remove_all_matching([gid](auto current_gid) { return current_gid == gid; });
extra_gids = move(current_extra_gids);
}
if (!extra_gids.is_empty() || remove_extra_gids) {
target_account.set_extra_gids(extra_gids);
}
TRY(Core::System::pledge("stdio wpath rpath cpath fattr"));
TRY(target_account.sync());
return 0;
}