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Utilities: Update useradd to use /etc/shadow

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This updates useradd to write the spwd struct entry into
the /etc/shadow file via putspent.

Fixes #4884
This commit is contained in:
brapru 2021-05-29 08:24:41 -04:00 • committed by Linus Groh
parent 1560775494
commit ff4f3dd586
1 changed files with 42 additions and 1 deletions
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43
Userland/Utilities/useradd.cpp
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@ -1,14 +1,19 @@
/* /*
* Copyright (c) 2019-2020, Jesse Buhagiar <jooster669@gmail.com> * Copyright (c) 2019-2020, Jesse Buhagiar <jooster669@gmail.com>
* Copyright (c) 2021, Brandon Pruitt <brapru@pm.me>
* *
* SPDX-License-Identifier: BSD-2-Clause * SPDX-License-Identifier: BSD-2-Clause
*/ */
#include <AK/Base64.h>
#include <AK/Random.h>
#include <AK/String.h> #include <AK/String.h>
#include <LibCore/ArgsParser.h> #include <LibCore/ArgsParser.h>
#include <crypt.h>
#include <ctype.h> #include <ctype.h>
#include <errno.h> #include <errno.h>
#include <pwd.h> #include <pwd.h>
#include <shadow.h>
#include <stdio.h> #include <stdio.h>
#include <string.h> #include <string.h>
#include <sys/stat.h> #include <sys/stat.h>
@ -87,6 +92,12 @@ int main(int argc, char** argv)
return 1; return 1;
} }
FILE* spwdfile = fopen("/etc/shadow", "a");
if (!spwdfile) {
perror("failed to open /etc/shadow");
return 1;
}
String home; String home;
if (!home_path) if (!home_path)
home = String::formatted("/home/{}", username); home = String::formatted("/home/{}", username);
@ -111,21 +122,51 @@ int main(int argc, char** argv)
} }
} }
auto get_salt = []() {
char random_data[12];
fill_with_random(random_data, sizeof(random_data));
StringBuilder builder;
builder.append("$5$");
builder.append(encode_base64(ReadonlyBytes(random_data, sizeof(random_data))));
return builder.build();
};
char* hash = crypt(password, get_salt().characters());
struct passwd p; struct passwd p;
p.pw_name = const_cast<char*>(username); p.pw_name = const_cast<char*>(username);
p.pw_passwd = const_cast<char*>(password); p.pw_passwd = const_cast<char*>("!");
p.pw_dir = const_cast<char*>(home.characters()); p.pw_dir = const_cast<char*>(home.characters());
p.pw_uid = static_cast<uid_t>(uid); p.pw_uid = static_cast<uid_t>(uid);
p.pw_gid = static_cast<gid_t>(gid); p.pw_gid = static_cast<gid_t>(gid);
p.pw_shell = const_cast<char*>(shell); p.pw_shell = const_cast<char*>(shell);
p.pw_gecos = const_cast<char*>(gecos); p.pw_gecos = const_cast<char*>(gecos);
struct spwd s;
s.sp_namp = const_cast<char*>(username);
s.sp_pwdp = const_cast<char*>(hash);
s.sp_lstchg = 18727;
s.sp_min = 0;
s.sp_max = 99999;
s.sp_warn = -1;
s.sp_inact = -1;
s.sp_expire = -1;
s.sp_flag = -1;
if (putpwent(&p, pwfile) < 0) { if (putpwent(&p, pwfile) < 0) {
perror("putpwent"); perror("putpwent");
return 1; return 1;
} }
if (putspent(&s, spwdfile) < 0) {
perror("putspent");
return 1;
}
fclose(pwfile); fclose(pwfile);
fclose(spwdfile);
return 0; return 0;
} }