[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 HAVE_PAM

RCSID("$Id$");

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

#ifdef HAVE_SHADOW_H
#include <shadow.h>
#endif

#ifdef HAVE_MD5_PASSWORDS
#include "md5crypt.h"
#endif

/*
 * 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;
#ifdef HAVE_SHADOW_H
	struct spwd *spw;
#endif

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

#ifdef HAVE_SHADOW_H
	spw = getspnam(pw->pw_name);
	if (spw == NULL)
		return(0);

	if ((spw->sp_namp == NULL) || (strcmp(pw->pw_name, spw->sp_namp) != 0))
		fatal("Shadow lookup returned garbage.");

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

	if (strlen(spw->sp_pwdp) < 3)
		return(0);

	/* Encrypt the candidate password using the proper salt. */
#ifdef HAVE_MD5_PASSWORDS
	if (is_md5_salt(spw->sp_pwdp))
		encrypted_password = md5_crypt(password, spw->sp_pwdp);
	else
		encrypted_password = crypt(password, spw->sp_pwdp);
#else /* HAVE_MD5_PASSWORDS */    
	encrypted_password = crypt(password, spw->sp_pwdp);
#endif /* HAVE_MD5_PASSWORDS */    
	/* Authentication is accepted if the encrypted passwords are identical. */
	return (strcmp(encrypted_password, spw->sp_pwdp) == 0);
#else /* !HAVE_SHADOW_H */
	encrypted_password = crypt(password,
	    (pw->pw_passwd[0] && pw->pw_passwd[1]) ? pw->pw_passwd : "xx");

	/* Authentication is accepted if the encrypted passwords are identical. */
	return (strcmp(encrypted_password, pw->pw_passwd) == 0);
#endif /* !HAVE_SHADOW_H */
}
#endif /* !HAVE_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
	12	#ifndef HAVE_PAM
	13
8efc0c15	14	RCSID("$Id$");
	15
	16	#include "packet.h"
	17	#include "ssh.h"
	18	#include "servconf.h"
	19	#include "xmalloc.h"
b2344d54	20
	21	#ifdef HAVE_SHADOW_H
	22	#include <shadow.h>
	23	#endif
	24
caf3bc51	25	#ifdef HAVE_MD5_PASSWORDS
	26	#include "md5crypt.h"
	27	#endif
	28
5260325f	29	/*
	30	* Tries to authenticate the user using password. Returns true if
	31	* authentication succeeds.
	32	*/
	33	int
	34	auth_password(struct passwd * pw, const char *password)
8efc0c15	35	{
5260325f	36	extern ServerOptions options;
5260325f	37	char *encrypted_password;
b2344d54	38	#ifdef HAVE_SHADOW_H
5260325f	39	struct spwd *spw;
b2344d54	40	#endif
8efc0c15	41
aa3378df	42	if (pw->pw_uid == 0 && options.permit_root_login == 2)
5260325f	43	return 0;
aa3378df	44	if (*password == '\0' && options.permit_empty_passwd == 0)
5260325f	45	return 0;
5260325f	46	/* deny if no user. */
	47	if (pw == NULL)
	48	return 0;
8efc0c15	49
8efc0c15	50	#ifdef SKEY
5260325f	51	if (options.skey_authentication == 1) {
57112b5a	52	int ret = auth_skey_password(pw, password);
	53	if (ret == 1 \|\| ret == 0)
	54	return ret;
5260325f	55	/* Fall back to ordinary passwd authentication. */
5260325f	56	}
8efc0c15	57	#endif
57112b5a	58	#ifdef KRB4
	59	if (options.kerberos_authentication == 1) {
	60	int ret = auth_krb4_password(pw, password);
	61	if (ret == 1 \|\| ret == 0)
	62	return ret;
5260325f	63	/* Fall back to ordinary passwd authentication. */
8efc0c15	64	}
57112b5a	65	#endif
5260325f	66
5260325f	67	/* Check for users with no password. */
aa3378df	68	if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0)
5260325f	69	return 1;
8efc0c15	70
b2344d54	71	#ifdef HAVE_SHADOW_H
5260325f	72	spw = getspnam(pw->pw_name);
	73	if (spw == NULL)
	74	return(0);
b2344d54	75
5260325f	76	if ((spw->sp_namp == NULL) \|\| (strcmp(pw->pw_name, spw->sp_namp) != 0))
5260325f	77	fatal("Shadow lookup returned garbage.");
b2344d54	78
c9d323f0	79	/* Check for users with no password. */
	80	if (strcmp(password, "") == 0 && strcmp(spw->sp_pwdp, "") == 0)
	81	return 1;
	82
5260325f	83	if (strlen(spw->sp_pwdp) < 3)
5260325f	84	return(0);
b2344d54	85
5260325f	86	/* Encrypt the candidate password using the proper salt. */
caf3bc51	87	#ifdef HAVE_MD5_PASSWORDS
5260325f	88	if (is_md5_salt(spw->sp_pwdp))
	89	encrypted_password = md5_crypt(password, spw->sp_pwdp);
	90	else
	91	encrypted_password = crypt(password, spw->sp_pwdp);
caf3bc51	92	#else /* HAVE_MD5_PASSWORDS */
5260325f	93	encrypted_password = crypt(password, spw->sp_pwdp);
caf3bc51	94	#endif /* HAVE_MD5_PASSWORDS */
5260325f	95	/* Authentication is accepted if the encrypted passwords are identical. */
5260325f	96	return (strcmp(encrypted_password, spw->sp_pwdp) == 0);
b2344d54	97	#else /* !HAVE_SHADOW_H */
5260325f	98	encrypted_password = crypt(password,
5260325f	99	(pw->pw_passwd[0] && pw->pw_passwd[1]) ? pw->pw_passwd : "xx");
b2344d54	100
5260325f	101	/* Authentication is accepted if the encrypted passwords are identical. */
5260325f	102	return (strcmp(encrypted_password, pw->pw_passwd) == 0);
b2344d54	103	#endif /* !HAVE_SHADOW_H */
8efc0c15	104	}
b2344d54	105	#endif /* !HAVE_PAM */