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xrdp-proprietary/sesman/verify_user.c

334 lines
6.7 KiB

/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2004-2013
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
*
* @file verify_user.c
* @brief Authenticate user using standard unix passwd/shadow system
* @author Jay Sorg, Simone Fedele
*
*/
#include "sesman.h"
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <crypt.h>
#include <shadow.h>
#include <pwd.h>
#ifndef SECS_PER_DAY
#define SECS_PER_DAY (24L*3600L)
#endif
extern struct config_sesman *g_cfg; /* in sesman.c */
static int DEFAULT_CC
auth_crypt_pwd(const char *pwd, const char *pln, char *crp);
static int DEFAULT_CC
auth_account_disabled(struct spwd *stp);
/******************************************************************************/
/* returns boolean */
long DEFAULT_CC
auth_userpass(const char *user, const char *pass, int *errorcode)
{
const char *encr;
const char *epass;
struct passwd *spw;
struct spwd *stp;
spw = getpwnam(user);
if (spw == 0)
{
return 0;
}
if (g_strncmp(spw->pw_passwd, "x", 3) == 0)
{
/* the system is using shadow */
stp = getspnam(user);
if (stp == 0)
{
return 0;
}
if (1 == auth_account_disabled(stp))
{
log_message(LOG_LEVEL_INFO, "account %s is disabled", user);
return 0;
}
encr = stp->sp_pwdp;
}
else
{
/* old system with only passwd */
encr = spw->pw_passwd;
}
epass = crypt(pass, encr);
if (epass == 0)
{
return 0;
}
return (strcmp(encr, epass) == 0);
}
/******************************************************************************/
/* returns error */
int DEFAULT_CC
auth_start_session(long in_val, int in_display)
{
return 0;
}
/******************************************************************************/
/* returns error */
int DEFAULT_CC
auth_stop_session(long in_val)
{
return 0;
}
/******************************************************************************/
int DEFAULT_CC
auth_end(long in_val)
{
return 0;
}
/******************************************************************************/
int DEFAULT_CC
auth_set_env(long in_val)
{
return 0;
}
/******************************************************************************/
int DEFAULT_CC
auth_check_pwd_chg(const char *user)
{
struct passwd *spw;
struct spwd *stp;
int now;
long today;
spw = getpwnam(user);
if (spw == 0)
{
return AUTH_PWD_CHG_ERROR;
}
if (g_strncmp(spw->pw_passwd, "x", 3) != 0)
{
/* old system with only passwd */
return AUTH_PWD_CHG_OK;
}
/* the system is using shadow */
stp = getspnam(user);
if (stp == 0)
{
return AUTH_PWD_CHG_ERROR;
}
/* check if we need a pwd change */
now = g_time1();
today = now / SECS_PER_DAY;
if (stp->sp_expire == -1)
{
return AUTH_PWD_CHG_OK;
}
if (today >= (stp->sp_lstchg + stp->sp_max - stp->sp_warn))
{
return AUTH_PWD_CHG_CHANGE;
}
if (today >= (stp->sp_lstchg + stp->sp_max))
{
return AUTH_PWD_CHG_CHANGE_MANDATORY;
}
if (today < ((stp->sp_lstchg) + (stp->sp_min)))
{
/* cannot change pwd for now */
return AUTH_PWD_CHG_NOT_NOW;
}
return AUTH_PWD_CHG_OK;
}
int DEFAULT_CC
auth_change_pwd(const char *user, const char *newpwd)
{
struct passwd *spw;
struct spwd *stp;
char hash[35] = "";
long today;
FILE *fd;
if (0 != lckpwdf())
{
return 1;
}
/* open passwd */
spw = getpwnam(user);
if (spw == 0)
{
return 1;
}
if (g_strncmp(spw->pw_passwd, "x", 3) != 0)
{
/* old system with only passwd */
if (auth_crypt_pwd(spw->pw_passwd, newpwd, hash) != 0)
{
ulckpwdf();
return 1;
}
spw->pw_passwd = g_strdup(hash);
fd = fopen("/etc/passwd", "rw");
putpwent(spw, fd);
}
else
{
/* the system is using shadow */
stp = getspnam(user);
if (stp == 0)
{
return 1;
}
/* old system with only passwd */
if (auth_crypt_pwd(stp->sp_pwdp, newpwd, hash) != 0)
{
ulckpwdf();
return 1;
}
stp->sp_pwdp = g_strdup(hash);
today = g_time1() / SECS_PER_DAY;
stp->sp_lstchg = today;
stp->sp_expire = today + stp->sp_max + stp->sp_inact;
fd = fopen("/etc/shadow", "rw");
putspent(stp, fd);
}
ulckpwdf();
return 0;
}
/**
*
* @brief Password encryption
* @param pwd Old password
* @param pln Plaintext new password
* @param crp Crypted new password
*
*/
static int DEFAULT_CC
auth_crypt_pwd(const char *pwd, const char *pln, char *crp)
{
char salt[13] = "$1$";
int saltcnt = 0;
char *encr;
if (g_strncmp(pwd, "$1$", 3) == 0)
{
/* gnu style crypt(); */
saltcnt = 3;
while ((pwd[saltcnt] != '$') && (saltcnt < 11))
{
salt[saltcnt] = pwd[saltcnt];
saltcnt++;
}
salt[saltcnt] = '$';
salt[saltcnt + 1] = '\0';
}
else
{
/* classic two char salt */
salt[0] = pwd[0];
salt[1] = pwd[1];
salt[2] = '\0';
}
encr = crypt(pln, salt);
g_strncpy(crp, encr, 34);
return 0;
}
/**
*
* @return 1 if the account is disabled, 0 otherwise
*
*/
static int DEFAULT_CC
auth_account_disabled(struct spwd *stp)
{
int today;
if (0 == stp)
{
/* if an invalid struct was passed we assume a disabled account */
return 1;
}
today = g_time1() / SECS_PER_DAY;
LOG_DBG("last %d", stp->sp_lstchg);
LOG_DBG("min %d", stp->sp_min);
LOG_DBG("max %d", stp->sp_max);
LOG_DBG("inact %d", stp->sp_inact);
LOG_DBG("warn %d", stp->sp_warn);
LOG_DBG("expire %d", stp->sp_expire);
LOG_DBG("today %d", today);
if ((stp->sp_expire != -1) && (today >= stp->sp_expire))
{
return 1;
}
if ((stp->sp_max >= 0) &&
(stp->sp_inact >= 0) &&
(stp->sp_lstchg > 0) &&
(today >= (stp->sp_lstchg + stp->sp_max + stp->sp_inact)))
{
return 1;
}
return 0;
}