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/*
* Copyright 2008-2013, Ingo Weinhold, ingo_weinhold@gmx.de.
* Distributed under the terms of the MIT License.
*/
#include <errno.h>
#include <getopt.h>
#include <pwd.h>
#include <shadow.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>
#include <OS.h>
#include <RegistrarDefs.h>
#include <user_group.h>
#include <util/KMessage.h>
#include <AutoDeleter.h>
#include "multiuser_utils.h"
extern const char *__progname;
static const char* kUsage =
"Usage: %s [ <options> ] [ <user name> ]\n"
"Change the password of the specified user.\n"
"\n"
"Options:\n"
" -d\n"
" Delete the password for the specified user.\n"
" -h, --help\n"
" Print usage info.\n"
;
static void
print_usage_and_exit(bool error)
{
fprintf(error ? stderr : stdout, kUsage, __progname);
exit(error ? 1 : 0);
}
int
main(int argc, const char* const* argv)
{
bool deletePassword = false;
while (true) {
static struct option sLongOptions[] = {
{ "help", no_argument, 0, 'h' },
{ 0, 0, 0, 0 }
};
opterr = 0; // don't print errors
int c = getopt_long(argc, (char**)argv, "dh", sLongOptions, NULL);
if (c == -1)
break;
switch (c) {
case 'd':
deletePassword = true;
break;
case 'h':
print_usage_and_exit(false);
break;
default:
print_usage_and_exit(true);
break;
}
}
if (optind + 1 < argc)
print_usage_and_exit(true);
const char* user = optind < argc ? argv[optind] : NULL;
if (geteuid() != 0) {
fprintf(stderr, "Error: You need to be root.\n");
exit(1);
}
// this is a set-uid tool -- get the real UID
uid_t uid = getuid();
if (deletePassword) {
if (uid != 0) {
fprintf(stderr, "Error: Only root can delete users' passwords.\n");
exit(1);
}
if (user == NULL) {
fprintf(stderr, "Error: A user must be specified.\n");
exit(1);
}
}
// get the passwd entry
struct passwd* passwd;
if (user != NULL) {
passwd = getpwnam(user);
if (passwd == NULL) {
fprintf(stderr, "Error: No user with name \"%s\".\n", user);
exit(1);
}
if (uid != 0 && passwd->pw_uid != uid) {
fprintf(stderr, "Error: Only root can change the passwd for other "
"users.\n");
exit(1);
}
} else {
passwd = getpwuid(uid);
if (passwd == NULL) {
fprintf(stderr, "Error: Ugh! Couldn't get passwd entry for uid "
"%d.\n", uid);
exit(1);
}
user = passwd->pw_name;
}
// if not root, the user needs to authenticate
if (uid != 0) {
if (authenticate_user("old password: ", passwd, getspnam(user), 1,
false) != B_OK) {
exit(1);
}
}
char password[LINE_MAX];
char* encryptedPassword;
if (deletePassword) {
password[0] = '\0';
encryptedPassword = password;
} else {
// read new password
if (read_password("new password: ", password, sizeof(password), false)
!= B_OK) {
exit(1);
}
if (strlen(password) >= MAX_SHADOW_PWD_PASSWORD_LEN) {
fprintf(stderr, "Error: The password is too long.\n");
exit(1);
}
// read password again
char repeatedPassword[LINE_MAX];
if (read_password("repeat new password: ", repeatedPassword,
sizeof(repeatedPassword), false) != B_OK) {
exit(1);
}
// passwords need to match
if (strcmp(password, repeatedPassword) != 0) {
fprintf(stderr, "Error: passwords don't match\n");
exit(1);
}
explicit_bzero(repeatedPassword, sizeof(repeatedPassword));
// crypt it
encryptedPassword = crypt(password, NULL);
explicit_bzero(password, sizeof(password));
}
// prepare request for the registrar
KMessage message(BPrivate::B_REG_UPDATE_USER);
if (message.AddInt32("uid", passwd->pw_uid) != B_OK
|| message.AddInt32("last changed", time(NULL)) != B_OK
|| message.AddString("password", "x") != B_OK
|| message.AddString("shadow password", encryptedPassword) != B_OK) {
fprintf(stderr, "Error: Failed to construct message!\n");
exit(1);
}
// send the request
KMessage reply;
status_t error = send_authentication_request_to_registrar(message, reply);
if (error != B_OK) {
fprintf(stderr, "Error: Failed to set the password: %s\n",
strerror(error));
exit(1);
}
return 0;
}
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