[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 1.2 2002/05/31 11:35:15 markus 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;
	off_t len, n;
	int fd;

	if ((fd = open(options.banner, O_RDONLY)) == -1)
		return (NULL);
	if (fstat(fd, &st) == -1) {
		close(fd);
		return (NULL);
	}
	len = st.st_size;
	banner = xmalloc(len + 1);
	n = atomicio(read, fd, banner, len);
	close(fd);

	if (n != len) {
		free(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);
	return;
}

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
	return (authctxt->valid ? PRIVSEP(auth_password(authctxt, "")) : 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"
	26	RCSID("$OpenBSD: auth2-none.c,v 1.2 2002/05/31 11:35:15 markus Exp $");
	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;
	49	off_t len, n;
	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	}
	58	len = st.st_size;
	59	banner = xmalloc(len + 1);
	60	n = atomicio(read, fd, banner, len);
	61	close(fd);
	62
	63	if (n != len) {
	64	free(banner);
65	return (NULL);
66	}
67	banner[n] = '\0';
68
69	return (banner);
70	}
71
72	static void
73	userauth_banner(void)
74	{
75	char *banner = NULL;
76
77	if (options.banner == NULL \|\| (datafellows & SSH_BUG_BANNER))
78	return;
79
80	if ((banner = PRIVSEP(auth2_read_banner())) == NULL)
81	goto done;
82
83	packet_start(SSH2_MSG_USERAUTH_BANNER);
84	packet_put_cstring(banner);
85	packet_put_cstring(""); /* language, unused */
86	packet_send();
87	debug("userauth_banner: sent");
88	done:
89	if (banner)
90	xfree(banner);
91	return;
92	}
93
94	static int
95	userauth_none(Authctxt *authctxt)
96	{
97	none_enabled = 0;
98	packet_check_eom();
99	userauth_banner();
100	#ifdef HAVE_CYGWIN
101	if (check_nt_auth(1, authctxt->pw) == 0)
102	return(0);
103	#endif
104	return (authctxt->valid ? PRIVSEP(auth_password(authctxt, "")) : 0);
105	}
106
107	Authmethod method_none = {
108	"none",
109	userauth_none,
110	&none_enabled
111	};