mirror of git://anongit.mindrot.org/openssh.git
240 lines
7.2 KiB
C
240 lines
7.2 KiB
C
/*
|
|
* Author: Tatu Ylonen <ylo@cs.hut.fi>
|
|
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
|
|
* All rights reserved
|
|
* Password authentication. This file contains the functions to check whether
|
|
* the password is valid for the user.
|
|
*
|
|
* As far as I am concerned, the code I have written for this software
|
|
* can be used freely for any purpose. Any derived versions of this
|
|
* software must be clearly marked as such, and if the derived work is
|
|
* incompatible with the protocol description in the RFC file, it must be
|
|
* called by a name other than "ssh" or "Secure Shell".
|
|
*
|
|
* Copyright (c) 1999 Dug Song. All rights reserved.
|
|
* Copyright (c) 2000 Markus Friedl. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "includes.h"
|
|
RCSID("$OpenBSD: auth-passwd.c,v 1.27 2002/05/24 16:45:16 stevesk Exp $");
|
|
|
|
#include "packet.h"
|
|
#include "log.h"
|
|
#include "servconf.h"
|
|
#include "auth.h"
|
|
|
|
#if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
|
|
/* Don't need any of these headers for the PAM or SIA cases */
|
|
# ifdef HAVE_CRYPT_H
|
|
# include <crypt.h>
|
|
# endif
|
|
# ifdef WITH_AIXAUTHENTICATE
|
|
# include <login.h>
|
|
# endif
|
|
# ifdef __hpux
|
|
# include <hpsecurity.h>
|
|
# include <prot.h>
|
|
# endif
|
|
# ifdef HAVE_SECUREWARE
|
|
# include <sys/security.h>
|
|
# include <sys/audit.h>
|
|
# include <prot.h>
|
|
# endif /* HAVE_SECUREWARE */
|
|
# if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
|
|
# include <shadow.h>
|
|
# endif
|
|
# if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
|
|
# include <sys/label.h>
|
|
# include <sys/audit.h>
|
|
# include <pwdadj.h>
|
|
# endif
|
|
# if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
|
|
# include "md5crypt.h"
|
|
# endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */
|
|
|
|
# ifdef HAVE_CYGWIN
|
|
# undef ERROR
|
|
# include <windows.h>
|
|
# include <sys/cygwin.h>
|
|
# define is_winnt (GetVersion() < 0x80000000)
|
|
# endif
|
|
#endif /* !USE_PAM && !HAVE_OSF_SIA */
|
|
|
|
extern ServerOptions options;
|
|
#ifdef WITH_AIXAUTHENTICATE
|
|
extern char *aixloginmsg;
|
|
#endif
|
|
|
|
/*
|
|
* Tries to authenticate the user using password. Returns true if
|
|
* authentication succeeds.
|
|
*/
|
|
int
|
|
auth_password(Authctxt *authctxt, const char *password)
|
|
{
|
|
struct passwd * pw = authctxt->pw;
|
|
int ok = authctxt->valid;
|
|
#if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
|
|
char *encrypted_password;
|
|
char *pw_password;
|
|
char *salt;
|
|
# if defined(__hpux) || defined(HAVE_SECUREWARE)
|
|
struct pr_passwd *spw;
|
|
# endif /* __hpux || HAVE_SECUREWARE */
|
|
# if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
|
|
struct spwd *spw;
|
|
# endif
|
|
# if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
|
|
struct passwd_adjunct *spw;
|
|
# endif
|
|
# ifdef WITH_AIXAUTHENTICATE
|
|
char *authmsg;
|
|
int authsuccess;
|
|
int reenter = 1;
|
|
# endif
|
|
#endif /* !defined(USE_PAM) && !defined(HAVE_OSF_SIA) */
|
|
|
|
/* deny if no user. */
|
|
if (pw == NULL)
|
|
ok = 0;
|
|
#ifndef HAVE_CYGWIN
|
|
if (pw && pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
|
|
ok = 0;
|
|
#endif
|
|
if (*password == '\0' && options.permit_empty_passwd == 0)
|
|
ok = 0;
|
|
|
|
#if defined(USE_PAM)
|
|
return auth_pam_password(authctxt, password) && ok;
|
|
#elif defined(HAVE_OSF_SIA)
|
|
if (!ok)
|
|
return 0;
|
|
return auth_sia_password(authctxt, password);
|
|
#else
|
|
if (!ok)
|
|
return 0;
|
|
# ifdef KRB5
|
|
if (options.kerberos_authentication == 1) {
|
|
int ret = auth_krb5_password(authctxt, password);
|
|
if (ret == 1 || ret == 0)
|
|
return ret;
|
|
/* Fall back to ordinary passwd authentication. */
|
|
}
|
|
# endif
|
|
# ifdef HAVE_CYGWIN
|
|
if (is_winnt) {
|
|
HANDLE hToken = cygwin_logon_user(pw, password);
|
|
|
|
if (hToken == INVALID_HANDLE_VALUE)
|
|
return 0;
|
|
cygwin_set_impersonation_token(hToken);
|
|
return 1;
|
|
}
|
|
# endif
|
|
# ifdef WITH_AIXAUTHENTICATE
|
|
authsuccess = (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
|
|
|
|
if (authsuccess)
|
|
/* We don't have a pty yet, so just label the line as "ssh" */
|
|
if (loginsuccess(authctxt->user,
|
|
get_canonical_hostname(options.verify_reverse_mapping),
|
|
"ssh", &aixloginmsg) < 0)
|
|
aixloginmsg = NULL;
|
|
|
|
return(authsuccess);
|
|
# endif
|
|
# ifdef KRB4
|
|
if (options.kerberos_authentication == 1) {
|
|
int ret = auth_krb4_password(authctxt, password);
|
|
if (ret == 1 || ret == 0)
|
|
return ret;
|
|
/* Fall back to ordinary passwd authentication. */
|
|
}
|
|
# endif
|
|
# ifdef BSD_AUTH
|
|
if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
|
|
(char *)password) == 0)
|
|
return 0;
|
|
else
|
|
return 1;
|
|
# endif
|
|
pw_password = pw->pw_passwd;
|
|
|
|
/*
|
|
* Various interfaces to shadow or protected password data
|
|
*/
|
|
# if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
|
|
spw = getspnam(pw->pw_name);
|
|
if (spw != NULL)
|
|
pw_password = spw->sp_pwdp;
|
|
# endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
|
|
|
|
# if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
|
|
if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL)
|
|
pw_password = spw->pwa_passwd;
|
|
# endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */
|
|
|
|
# ifdef HAVE_SECUREWARE
|
|
if ((spw = getprpwnam(pw->pw_name)) != NULL)
|
|
pw_password = spw->ufld.fd_encrypt;
|
|
# endif /* HAVE_SECUREWARE */
|
|
|
|
# if defined(__hpux) && !defined(HAVE_SECUREWARE)
|
|
if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL)
|
|
pw_password = spw->ufld.fd_encrypt;
|
|
# endif /* defined(__hpux) && !defined(HAVE_SECUREWARE) */
|
|
|
|
/* Check for users with no password. */
|
|
if ((password[0] == '\0') && (pw_password[0] == '\0'))
|
|
return 1;
|
|
|
|
if (pw_password[0] != '\0')
|
|
salt = pw_password;
|
|
else
|
|
salt = "xx";
|
|
|
|
# ifdef HAVE_MD5_PASSWORDS
|
|
if (is_md5_salt(salt))
|
|
encrypted_password = md5_crypt(password, salt);
|
|
else
|
|
encrypted_password = crypt(password, salt);
|
|
# else /* HAVE_MD5_PASSWORDS */
|
|
# if defined(__hpux) && !defined(HAVE_SECUREWARE)
|
|
if (iscomsec())
|
|
encrypted_password = bigcrypt(password, salt);
|
|
else
|
|
encrypted_password = crypt(password, salt);
|
|
# else
|
|
# ifdef HAVE_SECUREWARE
|
|
encrypted_password = bigcrypt(password, salt);
|
|
# else
|
|
encrypted_password = crypt(password, salt);
|
|
# endif /* HAVE_SECUREWARE */
|
|
# endif /* __hpux && !defined(HAVE_SECUREWARE) */
|
|
# endif /* HAVE_MD5_PASSWORDS */
|
|
|
|
/* Authentication is accepted if the encrypted passwords are identical. */
|
|
return (strcmp(encrypted_password, pw_password) == 0);
|
|
#endif /* !USE_PAM && !HAVE_OSF_SIA */
|
|
}
|