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/*
passwd.c - password entry lookup routines
Parts of this file were part of the nss_ldap library (as ldap-pwd.c)
which has been forked into the nss-pam-ldapd library.
Copyright (C) 1997-2005 Luke Howard
Copyright (C) 2006 West Consulting
Copyright (C) 2006-2014 Arthur de Jong
Copyright (C) 2014 Luke Shumaker
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <pthread.h>
#include "common.h"
#include "log.h"
#include "cfg.h"
#include "common/dict.h"
#include "compat/strndup.h"
#ifndef NSS_FLAVOUR_GLIBC
/* only check nsswitch.conf for glibc */
#define check_nsswitch_reload()
#define shadow_uses_nslcd() (1)
#endif /* NSS_FLAVOUR_GLIBC */
/* Note that the resulting password value should be one of:
<empty> - no password set, allow login without password
! - used to prevent logins
x - "valid" encrypted password that does not match any valid password
often used to indicate that the password is defined elsewhere
other - encrypted password, in crypt(3) format */
static int write_passwd(TFILE *fp, struct passwd *entry, uid_t calleruid)
{
const char *passwd;
/* if we are using shadow maps and this entry looks like it would return
shadow information, make the passwd entry indicate it */
if (nsswitch_shadow_uses_nslcd())
{
passwd = "x";
}
else
{
passwd = entry->pw_passwd;
if ((passwd == NULL) || (calleruid != 0))
passwd = "!";
}
if (entry->pw_uid >= nslcd_cfg->nss_min_uid)
{
WRITE_INT32(fp, NSLCD_RESULT_BEGIN);
WRITE_STRING(fp, entry->pw_name );
WRITE_STRING(fp, passwd );
WRITE_INT32( fp, entry->pw_uid );
WRITE_INT32( fp, entry->pw_gid );
WRITE_STRING(fp, entry->pw_gecos);
WRITE_STRING(fp, entry->pw_dir );
WRITE_STRING(fp, entry->pw_shell);
}
return 0;
}
NSLCD_HANDLE_UID(PASSWD, BYNAME
,/* decls */
char name[BUFLEN_NAME];
,/* read */
READ_STRING(fp, name);
log_setrequest("passwd=\"%s\"", name);
,/* check */
if (!isvalidname(name))
{
log_log(LOG_WARNING, "request denied by validnames option");
return -1;
}
nsswitch_check_reload();
,/* search */
struct passwd,
static size_t i = 0;
for (; i < session->cnt; i++)
{
if (session->users[i].pw_uid > 0 &&
STR_CMP(name, session->users[i].pw_name)==0) {
*rcp = 0;
i = session->cnt;
return &(session->users[i]);
}
}
return NULL;
,/* write */
return write_passwd(fp, entry, calleruid);
,/* cleanup */
)
NSLCD_HANDLE_UID(PASSWD, BYUID
,/* decls */
uid_t uid;
,/* read */
READ_INT32(fp, uid);
log_setrequest("passwd=%lu", (unsigned long int)uid);
,/* check */
if (uid < nslcd_cfg->nss_min_uid)
{
/* return an empty result */
WRITE_INT32(fp, NSLCD_VERSION);
WRITE_INT32(fp, NSLCD_ACTION_PASSWD_BYUID);
WRITE_INT32(fp, NSLCD_RESULT_END);
return 0;
}
nsswitch_check_reload();
,/* search */
struct passwd,
static size_t i = 0;
for (; i < session->cnt; i++)
{
if (uid == session->users[i].pw_uid) {
*rcp = 0;
i = session->cnt;
return &(session->users[i]);
}
}
return NULL;
,/* write */
return write_passwd(fp, entry, calleruid);
,/* cleanup */
)
NSLCD_HANDLE_UID(PASSWD, ALL
,/* decls */
,/* read */
log_setrequest("passwd(all)");
,/* check */
nsswitch_check_reload();
,/* search */
struct passwd,
static size_t i = 0;
for (; i < session->cnt; i++)
{
if (session->users[i].pw_uid > 0) {
*rcp = 0;
return &(session->users[i]);
}
}
return NULL;
,/* write */
return write_passwd(fp, entry, calleruid);
,/* cleanup */
)
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