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openssh/auth-passwd.c
Damien Miller 3a961dc0d3 - (djm) OpenBSD CVS Sync 
- markus@cvs.openbsd.org 2003/06/02 09:17:34
     [auth2-hostbased.c auth.c auth-options.c auth-rhosts.c auth-rh-rsa.c]
     [canohost.c monitor.c servconf.c servconf.h session.c sshd_config]
     [sshd_config.5]
     deprecate VerifyReverseMapping since it's dangerous if combined
     with IP based access control as noted by Mike Harding; replace with
     a UseDNS option, UseDNS is on by default and includes the
     VerifyReverseMapping check; with itojun@, provos@, jakob@ and deraadt@
     ok deraadt@, djm@
 - (djm) Fix portable-specific uses of verify_reverse_mapping too
2003-06-03 10:25:48 +10:00

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/*
* 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(HAVE_OSF_SIA)
/* Don't need any of these headers for the 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 /* !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(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(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(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.use_dns),
"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 /* !HAVE_OSF_SIA */
}
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