Userland: Move command-line utilities to Userland/Utilities/

1 files changed, 172 insertions, 0 deletions

diff --git a/Userland/Utilities/userdel.cpp b/Userland/Utilities/userdel.cpp
new file mode 100644
index 0000000000..818b73f0b4
--- /dev/null
+++ b/Userland/Utilities/userdel.cpp
@@ -0,0 +1,172 @@
+/*
+ * Copyright (c) 2020, Fei Wu <f.eiwu@yahoo.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/String.h>
+#include <AK/StringBuilder.h>
+#include <LibCore/ArgsParser.h>
+#include <LibCore/File.h>
+#include <ctype.h>
+#include <dirent.h>
+#include <errno.h>
+#include <pwd.h>
+#include <spawn.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+int main(int argc, char** argv)
+{
+    if (pledge("stdio wpath rpath cpath fattr proc exec", nullptr) < 0) {
+        perror("pledge");
+        return 1;
+    }
+
+    if (unveil("/etc/", "rwc") < 0) {
+        perror("unveil");
+        return 1;
+    }
+
+    if (unveil("/bin/rm", "x") < 0) {
+        perror("unveil");
+        return 1;
+    }
+
+    unveil(nullptr, nullptr);
+
+    const char* username = nullptr;
+    bool remove_home = false;
+
+    Core::ArgsParser args_parser;
+    args_parser.add_option(remove_home, "Remove home directory", "remove", 'r');
+    args_parser.add_positional_argument(username, "Login user identity (username)", "login");
+    args_parser.parse(argc, argv);
+
+    if (!remove_home) {
+        if (pledge("stdio wpath rpath cpath fattr", nullptr) < 0) {
+            perror("pledge");
+            return 1;
+        }
+    }
+
+    char temp_filename[] = "/etc/passwd.XXXXXX";
+    auto fd = mkstemp(temp_filename);
+    if (fd == -1) {
+        perror("failed to create temporary file");
+        return 1;
+    }
+
+    FILE* temp_file = fdopen(fd, "w");
+    if (!temp_file) {
+        perror("fdopen");
+        if (unlink(temp_filename) < 0) {
+            perror("unlink");
+        }
+
+        return 1;
+    }
+
+    bool user_exists = false;
+    String home_directory;
+
+    int rc = 0;
+    setpwent();
+    for (auto* pw = getpwent(); pw; pw = getpwent()) {
+        if (strcmp(pw->pw_name, username)) {
+            if (putpwent(pw, temp_file) != 0) {
+                perror("failed to put an entry in the temporary passwd file");
+                rc = 1;
+                break;
+            }
+        } else {
+            user_exists = true;
+            if (remove_home)
+                home_directory = pw->pw_dir;
+        }
+    }
+    endpwent();
+
+    if (fclose(temp_file)) {
+        perror("fclose");
+        if (!rc)
+            rc = 1;
+    }
+
+    if (rc == 0 && !user_exists) {
+        fprintf(stderr, "specified user doesn't exist\n");
+        rc = 6;
+    }
+
+    if (rc == 0 && chmod(temp_filename, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) {
+        perror("chmod");
+        rc = 1;
+    }
+
+    if (rc == 0 && rename(temp_filename, "/etc/passwd") < 0) {
+        perror("failed to rename the temporary passwd file");
+        rc = 1;
+    }
+
+    if (rc) {
+        if (unlink(temp_filename) < 0) {
+            perror("unlink");
+        }
+        return rc;
+    }
+
+    if (remove_home) {
+        if (access(home_directory.characters(), F_OK) == -1)
+            return 0;
+
+        String real_path = Core::File::real_path_for(home_directory);
+
+        if (real_path == "/") {
+            fprintf(stderr, "home directory is /, not deleted!\n");
+            return 12;
+        }
+
+        pid_t child;
+        const char* argv[] = { "rm", "-r", home_directory.characters(), nullptr };
+        if ((errno = posix_spawn(&child, "/bin/rm", nullptr, nullptr, const_cast<char**>(argv), environ))) {
+            perror("posix_spawn");
+            return 12;
+        }
+        int wstatus;
+        if (waitpid(child, &wstatus, 0) < 0) {
+            perror("waitpid");
+            return 12;
+        }
+        if (WEXITSTATUS(wstatus)) {
+            fprintf(stderr, "failed to remove the home directory\n");
+            return 12;
+        }
+    }
+
+    return 0;
+}