auth-passwd.c - third_party/openssh-portable - Git at Google

 /*
  * 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;
 #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)
 		return 0;
 #ifndef HAVE_CYGWIN
        if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
 		return 0;
 #endif
 	if (*password == '\0' && options.permit_empty_passwd == 0)
 		return 0;

 #if defined(USE_PAM)
 	return auth_pam_password(authctxt, password);
 #elif defined(HAVE_OSF_SIA)
 	return auth_sia_password(authctxt, password);
 #else
 # 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 */
 }
	/*
	* 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;
	#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)
	return 0;
	#ifndef HAVE_CYGWIN
	if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
	return 0;
	#endif
	if (*password == '\0' && options.permit_empty_passwd == 0)
	return 0;

	#if defined(USE_PAM)
	return auth_pam_password(authctxt, password);
	#elif defined(HAVE_OSF_SIA)
	return auth_sia_password(authctxt, password);
	#else
	# 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 */
	}