[openssh.git] / auth-passwd.c

/*
 * Author: Tatu Ylonen <ylo@cs.hut.fi>
 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
 *                    All rights reserved
 * Created: Sat Mar 18 05:11:38 1995 ylo
 * Password authentication.  This file contains the functions to check whether
 * the password is valid for the user.
 */

#include "includes.h"

#ifndef USE_PAM

RCSID("$Id$");

#include "packet.h"
#include "ssh.h"
#include "servconf.h"
#include "xmalloc.h"

#ifdef HAVE_SHADOW_H
# include <shadow.h>
#endif
#if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
# include "md5crypt.h"
#endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */

/*
 * Tries to authenticate the user using password.  Returns true if
 * authentication succeeds.
 */
int 
auth_password(struct passwd * pw, const char *password)
{
	extern ServerOptions options;
	char *encrypted_password;
	char *pw_password;
	char *salt;
#ifdef HAVE_SHADOW_H
	struct spwd *spw;
#endif

	/* deny if no user. */
	if (pw == NULL)
		return 0;
	if (pw->pw_uid == 0 && options.permit_root_login == 2)
		return 0;
	if (*password == '\0' && options.permit_empty_passwd == 0)
		return 0;

#ifdef SKEY
	if (options.skey_authentication == 1) {
		int ret = auth_skey_password(pw, password);
		if (ret == 1 || ret == 0)
			return ret;
		/* Fall back to ordinary passwd authentication. */
	}
#endif
#ifdef KRB4
	if (options.kerberos_authentication == 1) {
		int ret = auth_krb4_password(pw, password);
		if (ret == 1 || ret == 0)
			return ret;
		/* Fall back to ordinary passwd authentication. */
	}
#endif

	/* Check for users with no password. */
	if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0)
		return 1;

	pw_password = pw->pw_passwd;

#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
	spw = getspnam(pw->pw_name);
	if (spw != NULL) 
	{
		/* Check for users with no password. */
		if (strcmp(password, "") == 0 && strcmp(spw->sp_pwdp, "") == 0)
			return 1;

		pw_password = spw->sp_pwdp;
	}
#endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */

	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 */    
	encrypted_password = crypt(password, salt);
#endif /* HAVE_MD5_PASSWORDS */    

	/* Authentication is accepted if the encrypted passwords are identical. */
	return (strcmp(encrypted_password, pw_password) == 0);
}
#endif /* !USE_PAM */
Commit	Line	Data
8efc0c15	1	/*
5260325f	2	* Author: Tatu Ylonen <ylo@cs.hut.fi>
	3	* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
	4	* All rights reserved
	5	* Created: Sat Mar 18 05:11:38 1995 ylo
	6	* Password authentication. This file contains the functions to check whether
	7	* the password is valid for the user.
	8	*/
8efc0c15	9
8efc0c15	10	#include "includes.h"
caf3bc51	11
d94aa2ae	12	#ifndef USE_PAM
caf3bc51	13
8efc0c15	14	RCSID("$Id$");
	15
	16	#include "packet.h"
	17	#include "ssh.h"
	18	#include "servconf.h"
	19	#include "xmalloc.h"
b2344d54	20
b2344d54	21	#ifdef HAVE_SHADOW_H
d94aa2ae	22	# include <shadow.h>
caf3bc51	23	#endif
d94aa2ae	24	#if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
	25	# include "md5crypt.h"
	26	#endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */
caf3bc51	27
5260325f	28	/*
	29	* Tries to authenticate the user using password. Returns true if
	30	* authentication succeeds.
	31	*/
	32	int
	33	auth_password(struct passwd * pw, const char *password)
8efc0c15	34	{
5260325f	35	extern ServerOptions options;
5260325f	36	char *encrypted_password;
f498ed15	37	char *pw_password;
f498ed15	38	char *salt;
b2344d54	39	#ifdef HAVE_SHADOW_H
5260325f	40	struct spwd *spw;
b2344d54	41	#endif
8efc0c15	42
13f825f4	43	/* deny if no user. */
	44	if (pw == NULL)
	45	return 0;
aa3378df	46	if (pw->pw_uid == 0 && options.permit_root_login == 2)
5260325f	47	return 0;
aa3378df	48	if (*password == '\0' && options.permit_empty_passwd == 0)
5260325f	49	return 0;
8efc0c15	50
8efc0c15	51	#ifdef SKEY
5260325f	52	if (options.skey_authentication == 1) {
57112b5a	53	int ret = auth_skey_password(pw, password);
	54	if (ret == 1 \|\| ret == 0)
	55	return ret;
5260325f	56	/* Fall back to ordinary passwd authentication. */
5260325f	57	}
8efc0c15	58	#endif
57112b5a	59	#ifdef KRB4
	60	if (options.kerberos_authentication == 1) {
	61	int ret = auth_krb4_password(pw, password);
	62	if (ret == 1 \|\| ret == 0)
	63	return ret;
5260325f	64	/* Fall back to ordinary passwd authentication. */
8efc0c15	65	}
57112b5a	66	#endif
5260325f	67
5260325f	68	/* Check for users with no password. */
aa3378df	69	if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0)
5260325f	70	return 1;
8efc0c15	71
f498ed15	72	pw_password = pw->pw_passwd;
f498ed15	73
59dd7a31	74	#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
5260325f	75	spw = getspnam(pw->pw_name);
76b8607f	76	if (spw != NULL)
	77	{
	78	/* Check for users with no password. */
	79	if (strcmp(password, "") == 0 && strcmp(spw->sp_pwdp, "") == 0)
	80	return 1;
b2344d54	81
76b8607f	82	pw_password = spw->sp_pwdp;
76b8607f	83	}
f498ed15	84	#endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
b2344d54	85
f498ed15	86	if (pw_password[0] != '\0')
f498ed15	87	salt = pw_password;
5260325f	88	else
f498ed15	89	salt = "xx";
59dd7a31	90
59dd7a31	91	#ifdef HAVE_MD5_PASSWORDS
f498ed15	92	if (is_md5_salt(salt))
f498ed15	93	encrypted_password = md5_crypt(password, salt);
59dd7a31	94	else
f498ed15	95	encrypted_password = crypt(password, salt);
59dd7a31	96	#else /* HAVE_MD5_PASSWORDS */
f498ed15	97	encrypted_password = crypt(password, salt);
59dd7a31	98	#endif /* HAVE_MD5_PASSWORDS */
b2344d54	99
5260325f	100	/* Authentication is accepted if the encrypted passwords are identical. */
f498ed15	101	return (strcmp(encrypted_password, pw_password) == 0);
8efc0c15	102	}
d94aa2ae	103	#endif /* !USE_PAM */