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Utilities: Implement ArmedScopeGuard in userdel to unlink temp files

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brapru 2021-05-30 10:51:12 -04:00 committed by Linus Groh
parent af8b7248c8
commit d24dd7a3df
Notes: sideshowbarker 2024-07-18 17:09:21 +09:00 
Author: https://github.com/brapru
Commit: https://github.com/SerenityOS/serenity/commit/d24dd7a3dfd
Pull-request: https://github.com/SerenityOS/serenity/pull/7556
Issue: https://github.com/SerenityOS/serenity/issues/4884
Reviewed-by: https://github.com/bcoles
Reviewed-by: https://github.com/linusg
1 changed files with 27 additions and 38 deletions
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65
Userland/Utilities/userdel.cpp
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@ -5,6 +5,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/ScopeGuard.h>
#include <AK/String.h>
#include <AK/StringBuilder.h>
#include <LibCore/ArgsParser.h>
@ -60,6 +61,17 @@ int main(int argc, char** argv)
char temp_passwd[] = "/etc/passwd.XXXXXX";
char temp_shadow[] = "/etc/shadow.XXXXXX";
auto unlink_temp_files = [&] {
if (unlink(temp_passwd) < 0)
perror("unlink");
if (unlink(temp_shadow) < 0)
perror("unlink");
};
ArmedScopeGuard unlink_temp_files_guard = [&] {
unlink_temp_files();
};
auto temp_passwd_fd = mkstemp(temp_passwd);
if (temp_passwd_fd == -1) {
perror("failed to create temporary passwd file");
@ -75,34 +87,24 @@ int main(int argc, char** argv)
FILE* temp_passwd_file = fdopen(temp_passwd_fd, "w");
if (!temp_passwd_file) {
perror("fdopen");
if (unlink(temp_passwd) < 0) {
perror("unlink");
}
return 1;
}
FILE* temp_shadow_file = fdopen(temp_shadow_fd, "w");
if (!temp_shadow_file) {
perror("fdopen");
if (unlink(temp_shadow) < 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_passwd_file) != 0) {
perror("failed to put an entry in the temporary passwd file");
rc = 1;
break;
return 1;
}
} else {
user_exists = true;
@ -117,8 +119,7 @@ int main(int argc, char** argv)
if (strcmp(spwd->sp_namp, username)) {
if (putspent(spwd, temp_shadow_file) != 0) {
perror("failed to put an entry in the temporary shadow file");
rc = 1;
break;
return 1;
}
}
}
@ -126,52 +127,40 @@ int main(int argc, char** argv)
if (fclose(temp_passwd_file)) {
perror("fclose");
if (!rc)
rc = 1;
return 1;
}
if (fclose(temp_shadow_file)) {
perror("fclose");
if (!rc)
rc = 1;
return 1;
}
if (rc == 0 && !user_exists) {
if (!user_exists) {
warnln("specified user doesn't exist");
rc = 6;
return 1;
}
if (rc == 0 && chmod(temp_passwd, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) {
if (chmod(temp_passwd, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) {
perror("chmod");
rc = 1;
return 1;
}
if (rc == 0 && chmod(temp_shadow, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) {
if (chmod(temp_shadow, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) {
perror("chmod");
rc = 1;
return 1;
}
if (rc == 0 && rename(temp_passwd, "/etc/passwd") < 0) {
if (rename(temp_passwd, "/etc/passwd") < 0) {
perror("failed to rename the temporary passwd file");
rc = 1;
return 1;
}
if (rc == 0 && rename(temp_shadow, "/etc/shadow") < 0) {
if (rename(temp_shadow, "/etc/shadow") < 0) {
perror("failed to rename the temporary shadow file");
rc = 1;
return 1;
}
if (rc) {
if (unlink(temp_passwd) < 0) {
perror("unlink");
}
if (unlink(temp_shadow) < 0) {
perror("unlink");
}
return rc;
}
unlink_temp_files_guard.disarm();
if (remove_home) {
if (access(home_directory.characters(), F_OK) == -1)