[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 WITH_AIXAUTHENTICATE
#include <login.h>
#endif

#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
#ifdef WITH_AIXAUTHENTICATE
	char *authmsg;
	char *loginmsg;
	int reenter = 1;
#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 WITH_AIXAUTHENTICATE
	return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
#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
4c40f834	21	#ifdef WITH_AIXAUTHENTICATE
	22	#include <login.h>
	23	#endif
	24
b2344d54	25	#ifdef HAVE_SHADOW_H
d94aa2ae	26	# include <shadow.h>
caf3bc51	27	#endif
d94aa2ae	28	#if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
	29	# include "md5crypt.h"
	30	#endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */
caf3bc51	31
5260325f	32	/*
	33	* Tries to authenticate the user using password. Returns true if
	34	* authentication succeeds.
	35	*/
6ae2364d	36	int
5260325f	37	auth_password(struct passwd * pw, const char *password)
8efc0c15	38	{
5260325f	39	extern ServerOptions options;
5260325f	40	char *encrypted_password;
f498ed15	41	char *pw_password;
f498ed15	42	char *salt;
b2344d54	43	#ifdef HAVE_SHADOW_H
5260325f	44	struct spwd *spw;
b2344d54	45	#endif
4c40f834	46	#ifdef WITH_AIXAUTHENTICATE
	47	char *authmsg;
	48	char *loginmsg;
	49	int reenter = 1;
	50	#endif
8efc0c15	51
13f825f4	52	/* deny if no user. */
	53	if (pw == NULL)
	54	return 0;
aa3378df	55	if (pw->pw_uid == 0 && options.permit_root_login == 2)
5260325f	56	return 0;
aa3378df	57	if (*password == '\0' && options.permit_empty_passwd == 0)
5260325f	58	return 0;
8efc0c15	59
8efc0c15	60	#ifdef SKEY
5260325f	61	if (options.skey_authentication == 1) {
57112b5a	62	int ret = auth_skey_password(pw, password);
	63	if (ret == 1 \|\| ret == 0)
	64	return ret;
5260325f	65	/* Fall back to ordinary passwd authentication. */
5260325f	66	}
8efc0c15	67	#endif
4c40f834	68
	69	#ifdef WITH_AIXAUTHENTICATE
	70	return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
	71	#endif
	72
57112b5a	73	#ifdef KRB4
	74	if (options.kerberos_authentication == 1) {
	75	int ret = auth_krb4_password(pw, password);
	76	if (ret == 1 \|\| ret == 0)
	77	return ret;
5260325f	78	/* Fall back to ordinary passwd authentication. */
8efc0c15	79	}
57112b5a	80	#endif
5260325f	81
5260325f	82	/* Check for users with no password. */
aa3378df	83	if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0)
5260325f	84	return 1;
8efc0c15	85
f498ed15	86	pw_password = pw->pw_passwd;
f498ed15	87
59dd7a31	88	#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
5260325f	89	spw = getspnam(pw->pw_name);
76b8607f	90	if (spw != NULL)
	91	{
	92	/* Check for users with no password. */
	93	if (strcmp(password, "") == 0 && strcmp(spw->sp_pwdp, "") == 0)
	94	return 1;
b2344d54	95
76b8607f	96	pw_password = spw->sp_pwdp;
76b8607f	97	}
f498ed15	98	#endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
b2344d54	99
f498ed15	100	if (pw_password[0] != '\0')
f498ed15	101	salt = pw_password;
5260325f	102	else
f498ed15	103	salt = "xx";
59dd7a31	104
59dd7a31	105	#ifdef HAVE_MD5_PASSWORDS
f498ed15	106	if (is_md5_salt(salt))
f498ed15	107	encrypted_password = md5_crypt(password, salt);
59dd7a31	108	else
f498ed15	109	encrypted_password = crypt(password, salt);
59dd7a31	110	#else /* HAVE_MD5_PASSWORDS */
f498ed15	111	encrypted_password = crypt(password, salt);
59dd7a31	112	#endif /* HAVE_MD5_PASSWORDS */
b2344d54	113
5260325f	114	/* Authentication is accepted if the encrypted passwords are identical. */
f498ed15	115	return (strcmp(encrypted_password, pw_password) == 0);
8efc0c15	116	}
d94aa2ae	117	#endif /* !USE_PAM */