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su: Add the --login option

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This option, often used with only a lonely dash, allows to "simulate a
login". For now, it just changes the current directory to the home of
the new user.
This commit is contained in:
Lucas CHOLLET 2022-06-10 21:09:38 +02:00 • committed by Sam Atkins
parent 507cb411c2
commit 6900c4fe29
2 changed files with 23 additions and 7 deletions
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6
Base/usr/share/man/man1/su.md
View file

@ -5,7 +5,7 @@ su - switch to another user
## Synopsis ## Synopsis
```sh ```sh
$ su <user> $ su [-] <user>
``` ```
## Description ## Description
@ -14,6 +14,10 @@ $ su <user>
When called with no user-specified, `su` defaults to switch to the *root* user. Need to enter the password if the user switch to has one. When called with no user-specified, `su` defaults to switch to the *root* user. Need to enter the password if the user switch to has one.
## Options:
* `-`, `-l`, `--login`: Start the shell as it was a real login
## Arguments ## Arguments
* `user`: User to switch to (defaults to the user with UID 0) * `user`: User to switch to (defaults to the user with UID 0)

24
Userland/Utilities/su.cpp
View file

@ -5,13 +5,11 @@
* SPDX-License-Identifier: BSD-2-Clause * SPDX-License-Identifier: BSD-2-Clause
*/ */
#include <AK/ScopeGuard.h>
#include <LibCore/Account.h> #include <LibCore/Account.h>
#include <LibCore/ArgsParser.h> #include <LibCore/ArgsParser.h>
#include <LibCore/GetPassword.h> #include <LibCore/GetPassword.h>
#include <LibCore/System.h> #include <LibCore/System.h>
#include <LibMain/Main.h> #include <LibMain/Main.h>
#include <stdio.h>
#include <unistd.h> #include <unistd.h>
ErrorOr<int> serenity_main(Main::Arguments arguments) ErrorOr<int> serenity_main(Main::Arguments arguments)
@ -21,18 +19,29 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
if (!TRY(Core::System::isatty(STDIN_FILENO))) if (!TRY(Core::System::isatty(STDIN_FILENO)))
return Error::from_string_literal("Standard input is not a terminal"); return Error::from_string_literal("Standard input is not a terminal");
StringView user; StringView first_positional;
StringView second_positional;
bool simulate_login = false;
Core::ArgsParser args_parser; Core::ArgsParser args_parser;
args_parser.add_positional_argument(user, "User to switch to (defaults to user with UID 0)", "user", Core::ArgsParser::Required::No); args_parser.add_positional_argument(first_positional, "See --login", "-", Core::ArgsParser::Required::No);
args_parser.add_positional_argument(second_positional, "User to switch to (defaults to user with UID 0)", "user", Core::ArgsParser::Required::No);
args_parser.add_option(simulate_login, "Simulate login", "login", 'l');
args_parser.parse(arguments); args_parser.parse(arguments);
StringView user = first_positional;
if (first_positional == '-') {
simulate_login = true;
user = second_positional;
}
if (geteuid() != 0) if (geteuid() != 0)
return Error::from_string_literal("Not running as root :("); return Error::from_string_literal("Not running as root :(");
auto account = TRY(user.is_empty() ? Core::Account::from_uid(0) : Core::Account::from_name(user)); auto account = TRY(user.is_empty() ? Core::Account::from_uid(0) : Core::Account::from_name(user));
TRY(Core::System::pledge("stdio tty exec id")); TRY(Core::System::pledge("stdio rpath tty exec id"));
if (getuid() != 0 && account.has_password()) { if (getuid() != 0 && account.has_password()) {
auto password = TRY(Core::get_password()); auto password = TRY(Core::get_password());
@ -40,13 +49,16 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
return Error::from_string_literal("Incorrect or disabled password."); return Error::from_string_literal("Incorrect or disabled password.");
} }
TRY(Core::System::pledge("stdio exec id")); TRY(Core::System::pledge("stdio rpath exec id"));
if (!account.login()) { if (!account.login()) {
perror("Core::Account::login"); perror("Core::Account::login");
return 1; return 1;
} }
if (simulate_login)
TRY(Core::System::chdir(account.home_directory()));
TRY(Core::System::pledge("stdio exec")); TRY(Core::System::pledge("stdio exec"));
TRY(Core::System::setenv("HOME"sv, account.home_directory(), true)); TRY(Core::System::setenv("HOME"sv, account.home_directory(), true));