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Utilities: Update userdel to use /etc/shadow

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Updates userdel to delete entries from /etc/shadow.

Fixes #4884
This commit is contained in:
brapru 2021-05-29 08:36:08 -04:00 • committed by Linus Groh
parent ff4f3dd586
commit 54578ec5d4
1 changed files with 65 additions and 12 deletions
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77
Userland/Utilities/userdel.cpp
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@ -1,5 +1,6 @@
/* /*
* Copyright (c) 2020, Fei Wu <f.eiwu@yahoo.com> * Copyright (c) 2020, Fei Wu <f.eiwu@yahoo.com>
* Copyright (c) 2021, Brandon Pruitt <brapru@pm.me>
* *
* SPDX-License-Identifier: BSD-2-Clause * SPDX-License-Identifier: BSD-2-Clause
*/ */
@ -12,6 +13,7 @@
#include <dirent.h> #include <dirent.h>
#include <errno.h> #include <errno.h>
#include <pwd.h> #include <pwd.h>
#include <shadow.h>
#include <spawn.h> #include <spawn.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
@ -55,17 +57,35 @@ int main(int argc, char** argv)
} }
} }
char temp_filename[] = "/etc/passwd.XXXXXX"; char temp_passwd[] = "/etc/passwd.XXXXXX";
auto fd = mkstemp(temp_filename); char temp_shadow[] = "/etc/shadow.XXXXXX";
if (fd == -1) {
perror("failed to create temporary file"); auto temp_passwd_fd = mkstemp(temp_passwd);
if (temp_passwd_fd == -1) {
perror("failed to create temporary passwd file");
return 1; return 1;
} }
FILE* temp_file = fdopen(fd, "w"); auto temp_shadow_fd = mkstemp(temp_shadow);
if (!temp_file) { if (temp_shadow_fd == -1) {
perror("failed to create temporary shadow file");
return 1;
}
FILE* temp_passwd_file = fdopen(temp_passwd_fd, "w");
if (!temp_passwd_file) {
perror("fdopen"); perror("fdopen");
if (unlink(temp_filename) < 0) { 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"); perror("unlink");
} }
@ -79,7 +99,7 @@ int main(int argc, char** argv)
setpwent(); setpwent();
for (auto* pw = getpwent(); pw; pw = getpwent()) { for (auto* pw = getpwent(); pw; pw = getpwent()) {
if (strcmp(pw->pw_name, username)) { if (strcmp(pw->pw_name, username)) {
if (putpwent(pw, temp_file) != 0) { if (putpwent(pw, temp_passwd_file) != 0) {
perror("failed to put an entry in the temporary passwd file"); perror("failed to put an entry in the temporary passwd file");
rc = 1; rc = 1;
break; break;
@ -92,7 +112,25 @@ int main(int argc, char** argv)
} }
endpwent(); endpwent();
if (fclose(temp_file)) { setspent();
for (auto* spwd = getspent(); spwd; spwd = getspent()) {
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;
}
}
}
endspent();
if (fclose(temp_passwd_file)) {
perror("fclose");
if (!rc)
rc = 1;
}
if (fclose(temp_shadow_file)) {
perror("fclose"); perror("fclose");
if (!rc) if (!rc)
rc = 1; rc = 1;
@ -103,20 +141,35 @@ int main(int argc, char** argv)
rc = 6; rc = 6;
} }
if (rc == 0 && chmod(temp_filename, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) { if (rc == 0 && chmod(temp_passwd, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) {
perror("chmod"); perror("chmod");
rc = 1; rc = 1;
} }
if (rc == 0 && rename(temp_filename, "/etc/passwd") < 0) { if (rc == 0 && chmod(temp_shadow, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) {
perror("chmod");
rc = 1;
}
if (rc == 0 && rename(temp_passwd, "/etc/passwd") < 0) {
perror("failed to rename the temporary passwd file"); perror("failed to rename the temporary passwd file");
rc = 1; rc = 1;
} }
if (rc == 0 && rename(temp_shadow, "/etc/shadow") < 0) {
perror("failed to rename the temporary shadow file");
rc = 1;
}
if (rc) { if (rc) {
if (unlink(temp_filename) < 0) { if (unlink(temp_passwd) < 0) {
perror("unlink"); perror("unlink");
} }
if (unlink(temp_shadow) < 0) {
perror("unlink");
}
return rc; return rc;
} }