[openssh.git] / auth2-none.c

/*
 * 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: auth2-none.c,v 1.7 2004/05/11 19:01:43 deraadt Exp $");

#include "auth.h"
#include "xmalloc.h"
#include "packet.h"
#include "log.h"
#include "servconf.h"
#include "atomicio.h"
#include "compat.h"
#include "ssh2.h"
#include "monitor_wrap.h"

/* import */
extern ServerOptions options;

/* "none" is allowed only one time */
static int none_enabled = 1;

char *
auth2_read_banner(void)
{
	struct stat st;
	char *banner = NULL;
	size_t len, n;
	int fd;

	if ((fd = open(options.banner, O_RDONLY)) == -1)
		return (NULL);
	if (fstat(fd, &st) == -1) {
		close(fd);
		return (NULL);
	}
	if (st.st_size > 1*1024*1024) {
		close(fd);
		return (NULL);
	}

	len = (size_t)st.st_size;		/* truncate */
	banner = xmalloc(len + 1);
	n = atomicio(read, fd, banner, len);
	close(fd);

	if (n != len) {
		xfree(banner);
		return (NULL);
	}
	banner[n] = '\0';

	return (banner);
}

static void
userauth_banner(void)
{
	char *banner = NULL;

	if (options.banner == NULL || (datafellows & SSH_BUG_BANNER))
		return;

	if ((banner = PRIVSEP(auth2_read_banner())) == NULL)
		goto done;

	packet_start(SSH2_MSG_USERAUTH_BANNER);
	packet_put_cstring(banner);
	packet_put_cstring("");		/* language, unused */
	packet_send();
	debug("userauth_banner: sent");
done:
	if (banner)
		xfree(banner);
}

static int
userauth_none(Authctxt *authctxt)
{
	none_enabled = 0;
	packet_check_eom();
	userauth_banner();
#ifdef HAVE_CYGWIN
	if (check_nt_auth(1, authctxt->pw) == 0)
		return(0);
#endif
	if (options.password_authentication)
		return (PRIVSEP(auth_password(authctxt, "")));
	return (0);
}

Authmethod method_none = {
	"none",
	userauth_none,
	&none_enabled
};
Commit	Line	Data
013eab17	1	/*
	2	* Copyright (c) 2000 Markus Friedl. All rights reserved.
	3	*
	4	* Redistribution and use in source and binary forms, with or without
	5	* modification, are permitted provided that the following conditions
	6	* are met:
	7	* 1. Redistributions of source code must retain the above copyright
	8	* notice, this list of conditions and the following disclaimer.
	9	* 2. Redistributions in binary form must reproduce the above copyright
	10	* notice, this list of conditions and the following disclaimer in the
	11	* documentation and/or other materials provided with the distribution.
	12	*
	13	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	14	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	15	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	16	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	17	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	18	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	19	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	20	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	21	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	22	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	23	*/
	24
	25	#include "includes.h"
f6be21a0	26	RCSID("$OpenBSD: auth2-none.c,v 1.7 2004/05/11 19:01:43 deraadt Exp $");
013eab17	27
	28	#include "auth.h"
	29	#include "xmalloc.h"
	30	#include "packet.h"
	31	#include "log.h"
	32	#include "servconf.h"
	33	#include "atomicio.h"
	34	#include "compat.h"
	35	#include "ssh2.h"
	36	#include "monitor_wrap.h"
	37
	38	/* import */
	39	extern ServerOptions options;
	40
	41	/* "none" is allowed only one time */
	42	static int none_enabled = 1;
	43
	44	char *
	45	auth2_read_banner(void)
	46	{
	47	struct stat st;
	48	char *banner = NULL;
f6be21a0	49	size_t len, n;
013eab17	50	int fd;
	51
	52	if ((fd = open(options.banner, O_RDONLY)) == -1)
	53	return (NULL);
	54	if (fstat(fd, &st) == -1) {
	55	close(fd);
	56	return (NULL);
	57	}
f6be21a0	58	if (st.st_size > 110241024) {
	59	close(fd);
	60	return (NULL);
	61	}
	62
	63	len = (size_t)st.st_size; /* truncate */
013eab17	64	banner = xmalloc(len + 1);
	65	n = atomicio(read, fd, banner, len);
	66	close(fd);
	67
	68	if (n != len) {
30e37ee6	69	xfree(banner);
013eab17	70	return (NULL);
	71	}
	72	banner[n] = '\0';
7203d6bb	73
013eab17	74	return (banner);
	75	}
	76
	77	static void
	78	userauth_banner(void)
	79	{
	80	char *banner = NULL;
	81
	82	if (options.banner == NULL \|\| (datafellows & SSH_BUG_BANNER))
	83	return;
	84
	85	if ((banner = PRIVSEP(auth2_read_banner())) == NULL)
	86	goto done;
	87
	88	packet_start(SSH2_MSG_USERAUTH_BANNER);
	89	packet_put_cstring(banner);
	90	packet_put_cstring(""); /* language, unused */
	91	packet_send();
	92	debug("userauth_banner: sent");
	93	done:
	94	if (banner)
	95	xfree(banner);
013eab17	96	}
	97
	98	static int
	99	userauth_none(Authctxt *authctxt)
	100	{
	101	none_enabled = 0;
	102	packet_check_eom();
	103	userauth_banner();
	104	#ifdef HAVE_CYGWIN
	105	if (check_nt_auth(1, authctxt->pw) == 0)
	106	return(0);
	107	#endif
96d0bf74	108	if (options.password_authentication)
0f57e1e6	109	return (PRIVSEP(auth_password(authctxt, "")));
0f57e1e6	110	return (0);
013eab17	111	}
	112
	113	Authmethod method_none = {
	114	"none",
	115	userauth_none,
	116	&none_enabled
	117	};