2008-07-23 09:33:08 +00:00
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/* $OpenBSD: auth2.c,v 1.119 2008/07/04 23:30:16 djm Exp $ */
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2000-05-15 04:37:24 +00:00
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/*
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* Copyright (c) 2000 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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2000-09-10 08:31:17 +00:00
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2000-05-15 04:37:24 +00:00
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#include "includes.h"
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2006-09-30 13:29:51 +00:00
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#include <sys/types.h>
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2008-07-23 09:33:08 +00:00
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#include <sys/stat.h>
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#include <sys/uio.h>
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2006-09-30 13:29:51 +00:00
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|
|
2008-07-23 09:33:08 +00:00
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#include <fcntl.h>
|
2006-09-30 13:29:51 +00:00
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|
#include <pwd.h>
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|
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#include <stdarg.h>
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#include <string.h>
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2008-07-23 09:33:08 +00:00
|
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|
#include <unistd.h>
|
2006-09-30 13:29:51 +00:00
|
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|
2000-05-15 04:37:24 +00:00
|
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|
#include "xmalloc.h"
|
2008-07-23 09:33:08 +00:00
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|
#include "atomicio.h"
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2006-09-30 13:29:51 +00:00
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|
#include "ssh2.h"
|
2000-05-15 04:37:24 +00:00
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|
#include "packet.h"
|
2001-05-04 03:57:05 +00:00
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|
#include "log.h"
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2006-09-30 13:29:51 +00:00
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#include "buffer.h"
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2000-05-15 04:37:24 +00:00
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#include "servconf.h"
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#include "compat.h"
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2006-09-30 13:29:51 +00:00
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#include "key.h"
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#include "hostfile.h"
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2000-05-15 04:37:24 +00:00
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#include "auth.h"
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#include "dispatch.h"
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2001-05-04 03:57:05 +00:00
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#include "pathnames.h"
|
2005-06-05 15:40:50 +00:00
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|
#include "buffer.h"
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2000-05-15 04:37:24 +00:00
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|
2004-01-07 11:10:17 +00:00
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#ifdef GSSAPI
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#include "ssh-gss.h"
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#endif
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2006-09-30 13:29:51 +00:00
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#include "monitor_wrap.h"
|
2004-01-07 11:10:17 +00:00
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2000-05-15 04:37:24 +00:00
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/* import */
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extern ServerOptions options;
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2001-05-04 03:57:05 +00:00
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extern u_char *session_id2;
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2004-01-07 11:10:17 +00:00
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extern u_int session_id2_len;
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2005-06-05 15:40:50 +00:00
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extern Buffer loginmsg;
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2000-05-15 04:37:24 +00:00
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2002-06-23 14:01:54 +00:00
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/* methods */
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extern Authmethod method_none;
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extern Authmethod method_pubkey;
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extern Authmethod method_passwd;
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extern Authmethod method_kbdint;
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extern Authmethod method_hostbased;
|
2004-01-07 11:10:17 +00:00
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#ifdef GSSAPI
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extern Authmethod method_gssapi;
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#endif
|
2000-12-05 02:20:19 +00:00
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2002-06-23 14:01:54 +00:00
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Authmethod *authmethods[] = {
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&method_none,
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&method_pubkey,
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2004-01-07 11:10:17 +00:00
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#ifdef GSSAPI
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&method_gssapi,
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#endif
|
2002-06-23 14:01:54 +00:00
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&method_passwd,
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&method_kbdint,
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&method_hostbased,
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NULL
|
2000-12-05 02:20:19 +00:00
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};
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|
2000-05-15 04:37:24 +00:00
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/* protocol */
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2002-03-18 09:55:03 +00:00
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static void input_service_request(int, u_int32_t, void *);
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static void input_userauth_request(int, u_int32_t, void *);
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2000-05-15 04:37:24 +00:00
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/* helper */
|
2002-03-18 09:55:03 +00:00
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static Authmethod *authmethod_lookup(const char *);
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static char *authmethods_get(void);
|
2000-05-15 04:37:24 +00:00
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|
2008-07-23 09:33:08 +00:00
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char *
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auth2_read_banner(void)
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{
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struct stat st;
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char *banner = NULL;
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size_t len, n;
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int fd;
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if ((fd = open(options.banner, O_RDONLY)) == -1)
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return (NULL);
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if (fstat(fd, &st) == -1) {
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close(fd);
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return (NULL);
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}
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if (st.st_size > 1*1024*1024) {
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close(fd);
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return (NULL);
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}
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len = (size_t)st.st_size; /* truncate */
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banner = xmalloc(len + 1);
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n = atomicio(read, fd, banner, len);
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close(fd);
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if (n != len) {
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xfree(banner);
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return (NULL);
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}
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banner[n] = '\0';
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return (banner);
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}
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void
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userauth_send_banner(const char *msg)
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{
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if (datafellows & SSH_BUG_BANNER)
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return;
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packet_start(SSH2_MSG_USERAUTH_BANNER);
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packet_put_cstring(msg);
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packet_put_cstring(""); /* language, unused */
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packet_send();
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debug("%s: sent", __func__);
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}
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static void
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userauth_banner(void)
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{
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char *banner = NULL;
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if (options.banner == NULL ||
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strcasecmp(options.banner, "none") == 0 ||
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(datafellows & SSH_BUG_BANNER) != 0)
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return;
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if ((banner = PRIVSEP(auth2_read_banner())) == NULL)
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goto done;
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userauth_send_banner(banner);
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done:
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if (banner)
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xfree(banner);
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}
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2000-05-15 04:37:24 +00:00
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/*
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2000-12-05 02:20:19 +00:00
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* loop until authctxt->success == TRUE
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2000-05-15 04:37:24 +00:00
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*/
|
2004-02-26 10:38:49 +00:00
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void
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do_authentication2(Authctxt *authctxt)
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2000-05-15 04:37:24 +00:00
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{
|
2002-03-18 09:55:03 +00:00
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dispatch_init(&dispatch_protocol_error);
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2000-05-15 04:37:24 +00:00
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dispatch_set(SSH2_MSG_SERVICE_REQUEST, &input_service_request);
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2000-12-05 02:20:19 +00:00
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dispatch_run(DISPATCH_BLOCK, &authctxt->success, authctxt);
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2000-05-15 04:37:24 +00:00
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}
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|
2006-09-30 13:29:51 +00:00
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/*ARGSUSED*/
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2002-03-18 09:55:03 +00:00
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static void
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input_service_request(int type, u_int32_t seq, void *ctxt)
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2000-05-15 04:37:24 +00:00
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{
|
2000-12-05 02:20:19 +00:00
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Authctxt *authctxt = ctxt;
|
2001-05-04 03:57:05 +00:00
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u_int len;
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2002-10-29 09:43:00 +00:00
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int acceptit = 0;
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2000-05-15 04:37:24 +00:00
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char *service = packet_get_string(&len);
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2002-03-18 09:55:03 +00:00
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packet_check_eom();
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2000-05-15 04:37:24 +00:00
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2000-12-05 02:20:19 +00:00
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if (authctxt == NULL)
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fatal("input_service_request: no authctxt");
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|
2000-05-15 04:37:24 +00:00
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if (strcmp(service, "ssh-userauth") == 0) {
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2000-12-05 02:20:19 +00:00
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if (!authctxt->success) {
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2002-10-29 09:43:00 +00:00
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acceptit = 1;
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2000-05-15 04:37:24 +00:00
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/* now we can handle user-auth requests */
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dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &input_userauth_request);
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}
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}
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/* XXX all other service requests are denied */
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|
2002-10-29 09:43:00 +00:00
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if (acceptit) {
|
2000-05-15 04:37:24 +00:00
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packet_start(SSH2_MSG_SERVICE_ACCEPT);
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packet_put_cstring(service);
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packet_send();
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packet_write_wait();
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} else {
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debug("bad service request %s", service);
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packet_disconnect("bad service request %s", service);
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}
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xfree(service);
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}
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|
2006-09-30 13:29:51 +00:00
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/*ARGSUSED*/
|
2002-03-18 09:55:03 +00:00
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static void
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input_userauth_request(int type, u_int32_t seq, void *ctxt)
|
2000-05-15 04:37:24 +00:00
|
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{
|
2000-12-05 02:20:19 +00:00
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Authctxt *authctxt = ctxt;
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Authmethod *m = NULL;
|
2001-05-04 03:57:05 +00:00
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char *user, *service, *method, *style = NULL;
|
2000-05-15 04:37:24 +00:00
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int authenticated = 0;
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|
2000-12-05 02:20:19 +00:00
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if (authctxt == NULL)
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fatal("input_userauth_request: no authctxt");
|
2000-05-15 04:37:24 +00:00
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|
2000-12-05 02:20:19 +00:00
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user = packet_get_string(NULL);
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service = packet_get_string(NULL);
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method = packet_get_string(NULL);
|
2000-05-15 04:37:24 +00:00
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debug("userauth-request for user %s service %s method %s", user, service, method);
|
2001-05-04 03:57:05 +00:00
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debug("attempt %d failures %d", authctxt->attempt, authctxt->failures);
|
2000-12-05 02:20:19 +00:00
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2001-05-04 03:57:05 +00:00
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if ((style = strchr(user, ':')) != NULL)
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*style++ = 0;
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if (authctxt->attempt++ == 0) {
|
2000-12-05 02:20:19 +00:00
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/* setup auth context */
|
2002-06-23 14:01:54 +00:00
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authctxt->pw = PRIVSEP(getpwnamallow(user));
|
2004-04-20 09:35:04 +00:00
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authctxt->user = xstrdup(user);
|
2002-06-23 14:01:54 +00:00
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if (authctxt->pw && strcmp(service, "ssh-connection")==0) {
|
2000-12-05 02:20:19 +00:00
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authctxt->valid = 1;
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debug2("input_userauth_request: setting up authctxt for %s", user);
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} else {
|
2004-10-28 16:03:53 +00:00
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logit("input_userauth_request: invalid user %s", user);
|
2004-01-07 11:10:17 +00:00
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authctxt->pw = fakepw();
|
2005-06-05 15:40:50 +00:00
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#ifdef SSH_AUDIT_EVENTS
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PRIVSEP(audit_event(SSH_INVALID_USER));
|
2002-06-27 22:31:32 +00:00
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#endif
|
2000-05-15 04:37:24 +00:00
|
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}
|
2006-03-22 19:46:12 +00:00
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#ifdef USE_PAM
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if (options.use_pam)
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PRIVSEP(start_pam(authctxt));
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#endif
|
2004-10-28 16:03:53 +00:00
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setproctitle("%s%s", authctxt->valid ? user : "unknown",
|
2002-06-23 14:01:54 +00:00
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use_privsep ? " [net]" : "");
|
2000-12-05 02:20:19 +00:00
|
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|
authctxt->service = xstrdup(service);
|
2002-03-18 09:55:03 +00:00
|
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|
authctxt->style = style ? xstrdup(style) : NULL;
|
2002-06-23 14:01:54 +00:00
|
|
|
if (use_privsep)
|
|
|
|
mm_inform_authserv(service, style);
|
2008-07-23 09:33:08 +00:00
|
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|
userauth_banner();
|
2002-03-18 09:55:03 +00:00
|
|
|
} else if (strcmp(user, authctxt->user) != 0 ||
|
|
|
|
strcmp(service, authctxt->service) != 0) {
|
|
|
|
packet_disconnect("Change of username or service not allowed: "
|
|
|
|
"(%s,%s) -> (%s,%s)",
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|
|
authctxt->user, authctxt->service, user, service);
|
2000-12-05 02:20:19 +00:00
|
|
|
}
|
2001-05-04 03:57:05 +00:00
|
|
|
/* reset state */
|
2002-03-18 09:55:03 +00:00
|
|
|
auth2_challenge_stop(authctxt);
|
2004-01-07 11:10:17 +00:00
|
|
|
|
|
|
|
#ifdef GSSAPI
|
|
|
|
dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, NULL);
|
|
|
|
dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE, NULL);
|
|
|
|
#endif
|
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
authctxt->postponed = 0;
|
2000-12-05 02:20:19 +00:00
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
/* try to authenticate user */
|
2000-12-05 02:20:19 +00:00
|
|
|
m = authmethod_lookup(method);
|
2008-07-23 09:33:08 +00:00
|
|
|
if (m != NULL && authctxt->failures < options.max_authtries) {
|
2000-12-05 02:20:19 +00:00
|
|
|
debug2("input_userauth_request: try method %s", method);
|
|
|
|
authenticated = m->userauth(authctxt);
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
2001-05-04 03:57:05 +00:00
|
|
|
userauth_finish(authctxt, authenticated, method);
|
2000-12-05 02:20:19 +00:00
|
|
|
|
|
|
|
xfree(service);
|
|
|
|
xfree(user);
|
|
|
|
xfree(method);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
2001-05-04 03:57:05 +00:00
|
|
|
userauth_finish(Authctxt *authctxt, int authenticated, char *method)
|
2000-12-05 02:20:19 +00:00
|
|
|
{
|
2002-03-18 09:55:03 +00:00
|
|
|
char *methods;
|
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
if (!authctxt->valid && authenticated)
|
|
|
|
fatal("INTERNAL ERROR: authenticated invalid user %s",
|
|
|
|
authctxt->user);
|
2000-12-05 02:20:19 +00:00
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
/* Special handling for root */
|
2003-04-23 16:53:02 +00:00
|
|
|
if (authenticated && authctxt->pw->pw_uid == 0 &&
|
2005-06-05 15:40:50 +00:00
|
|
|
!auth_root_allowed(method)) {
|
2001-05-04 03:57:05 +00:00
|
|
|
authenticated = 0;
|
2005-06-05 15:40:50 +00:00
|
|
|
#ifdef SSH_AUDIT_EVENTS
|
|
|
|
PRIVSEP(audit_event(SSH_LOGIN_ROOT_DENIED));
|
|
|
|
#endif
|
|
|
|
}
|
2000-05-15 04:37:24 +00:00
|
|
|
|
2002-06-27 22:31:32 +00:00
|
|
|
#ifdef USE_PAM
|
2005-06-05 15:40:50 +00:00
|
|
|
if (options.use_pam && authenticated) {
|
|
|
|
if (!PRIVSEP(do_pam_account())) {
|
|
|
|
/* if PAM returned a message, send it to the user */
|
|
|
|
if (buffer_len(&loginmsg) > 0) {
|
|
|
|
buffer_append(&loginmsg, "\0", 1);
|
|
|
|
userauth_send_banner(buffer_ptr(&loginmsg));
|
|
|
|
packet_write_wait();
|
|
|
|
}
|
|
|
|
fatal("Access denied for user %s by PAM account "
|
2005-09-03 06:59:33 +00:00
|
|
|
"configuration", authctxt->user);
|
2005-06-05 15:40:50 +00:00
|
|
|
}
|
|
|
|
}
|
2004-01-07 11:10:17 +00:00
|
|
|
#endif
|
2002-06-27 22:31:32 +00:00
|
|
|
|
2002-10-29 09:43:00 +00:00
|
|
|
#ifdef _UNICOS
|
|
|
|
if (authenticated && cray_access_denied(authctxt->user)) {
|
|
|
|
authenticated = 0;
|
|
|
|
fatal("Access denied for user %s.",authctxt->user);
|
|
|
|
}
|
|
|
|
#endif /* _UNICOS */
|
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
/* Log before sending the reply */
|
|
|
|
auth_log(authctxt, authenticated, method, " ssh2");
|
2000-12-05 02:20:19 +00:00
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
if (authctxt->postponed)
|
|
|
|
return;
|
|
|
|
|
|
|
|
/* XXX todo: check if multiple auth methods are needed */
|
|
|
|
if (authenticated == 1) {
|
|
|
|
/* turn off userauth */
|
|
|
|
dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &dispatch_protocol_ignore);
|
|
|
|
packet_start(SSH2_MSG_USERAUTH_SUCCESS);
|
|
|
|
packet_send();
|
|
|
|
packet_write_wait();
|
|
|
|
/* now we can break out */
|
|
|
|
authctxt->success = 1;
|
|
|
|
} else {
|
2008-07-23 09:33:08 +00:00
|
|
|
|
|
|
|
/* Allow initial try of "none" auth without failure penalty */
|
|
|
|
if (authctxt->attempt > 1 || strcmp(method, "none") != 0)
|
|
|
|
authctxt->failures++;
|
|
|
|
if (authctxt->failures >= options.max_authtries) {
|
2005-06-05 15:40:50 +00:00
|
|
|
#ifdef SSH_AUDIT_EVENTS
|
|
|
|
PRIVSEP(audit_event(SSH_LOGIN_EXCEED_MAXTRIES));
|
|
|
|
#endif
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_disconnect(AUTH_FAIL_MSG, authctxt->user);
|
2005-06-05 15:40:50 +00:00
|
|
|
}
|
2002-03-18 09:55:03 +00:00
|
|
|
methods = authmethods_get();
|
|
|
|
packet_start(SSH2_MSG_USERAUTH_FAILURE);
|
|
|
|
packet_put_cstring(methods);
|
|
|
|
packet_put_char(0); /* XXX partial success, unused */
|
|
|
|
packet_send();
|
|
|
|
packet_write_wait();
|
|
|
|
xfree(methods);
|
|
|
|
}
|
2001-05-04 03:57:05 +00:00
|
|
|
}
|
2000-12-05 02:20:19 +00:00
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
static char *
|
2000-12-05 02:20:19 +00:00
|
|
|
authmethods_get(void)
|
2000-05-15 04:37:24 +00:00
|
|
|
{
|
2002-03-18 09:55:03 +00:00
|
|
|
Buffer b;
|
2000-12-05 02:20:19 +00:00
|
|
|
char *list;
|
2002-06-23 14:01:54 +00:00
|
|
|
int i;
|
2000-12-05 02:20:19 +00:00
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
buffer_init(&b);
|
2002-06-23 14:01:54 +00:00
|
|
|
for (i = 0; authmethods[i] != NULL; i++) {
|
|
|
|
if (strcmp(authmethods[i]->name, "none") == 0)
|
2000-12-05 02:20:19 +00:00
|
|
|
continue;
|
2002-06-23 14:01:54 +00:00
|
|
|
if (authmethods[i]->enabled != NULL &&
|
|
|
|
*(authmethods[i]->enabled) != 0) {
|
2002-03-18 09:55:03 +00:00
|
|
|
if (buffer_len(&b) > 0)
|
|
|
|
buffer_append(&b, ",", 1);
|
2002-06-23 14:01:54 +00:00
|
|
|
buffer_append(&b, authmethods[i]->name,
|
|
|
|
strlen(authmethods[i]->name));
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
|
|
|
}
|
2002-03-18 09:55:03 +00:00
|
|
|
buffer_append(&b, "\0", 1);
|
|
|
|
list = xstrdup(buffer_ptr(&b));
|
|
|
|
buffer_free(&b);
|
2000-12-05 02:20:19 +00:00
|
|
|
return list;
|
|
|
|
}
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
static Authmethod *
|
2000-12-05 02:20:19 +00:00
|
|
|
authmethod_lookup(const char *name)
|
|
|
|
{
|
2002-06-23 14:01:54 +00:00
|
|
|
int i;
|
|
|
|
|
2000-12-05 02:20:19 +00:00
|
|
|
if (name != NULL)
|
2002-06-23 14:01:54 +00:00
|
|
|
for (i = 0; authmethods[i] != NULL; i++)
|
|
|
|
if (authmethods[i]->enabled != NULL &&
|
|
|
|
*(authmethods[i]->enabled) != 0 &&
|
|
|
|
strcmp(name, authmethods[i]->name) == 0)
|
|
|
|
return authmethods[i];
|
|
|
|
debug2("Unrecognized authentication method name: %s",
|
|
|
|
name ? name : "NULL");
|
2000-12-05 02:20:19 +00:00
|
|
|
return NULL;
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
2008-07-23 09:33:08 +00:00
|
|
|
|