2010-03-08 11:19:52 +00:00
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/* $OpenBSD: sshconnect2.c,v 1.180 2010/02/26 20:29:54 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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2009-02-24 18:49:27 +00:00
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* Copyright (c) 2008 Damien Miller. All rights reserved.
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2000-05-15 04:37:24 +00:00
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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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#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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#include <sys/socket.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <errno.h>
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2010-03-08 11:19:52 +00:00
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#include <fcntl.h>
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2008-07-23 09:23:42 +00:00
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#include <netdb.h>
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2006-09-30 13:29:51 +00:00
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#include <pwd.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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2008-07-23 09:33:08 +00:00
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#if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H)
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#include <vis.h>
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#endif
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2004-01-07 11:10:17 +00:00
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#include "openbsd-compat/sys-queue.h"
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2000-05-15 04:37:24 +00:00
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2006-09-30 13:29:51 +00:00
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#include "xmalloc.h"
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2000-05-15 04:37:24 +00:00
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#include "ssh.h"
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2001-05-04 03:57:05 +00:00
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#include "ssh2.h"
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2000-05-15 04:37:24 +00:00
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#include "buffer.h"
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#include "packet.h"
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#include "compat.h"
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2001-05-04 03:57:05 +00:00
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#include "cipher.h"
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2006-09-30 13:29:51 +00:00
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#include "key.h"
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2000-05-15 04:37:24 +00:00
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#include "kex.h"
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#include "myproposal.h"
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#include "sshconnect.h"
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#include "authfile.h"
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2001-05-04 03:57:05 +00:00
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#include "dh.h"
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2000-09-10 08:31:17 +00:00
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#include "authfd.h"
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2001-05-04 03:57:05 +00:00
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#include "log.h"
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#include "readconf.h"
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2004-10-28 16:03:53 +00:00
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#include "misc.h"
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2001-05-04 03:57:05 +00:00
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#include "match.h"
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#include "dispatch.h"
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#include "canohost.h"
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2002-06-23 14:01:54 +00:00
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#include "msg.h"
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#include "pathnames.h"
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2006-09-30 13:29:51 +00:00
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#include "uidswap.h"
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2009-10-01 15:19:37 +00:00
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#include "schnorr.h"
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2009-02-24 18:49:27 +00:00
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#include "jpake.h"
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2000-12-05 02:20:19 +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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2000-05-15 04:37:24 +00:00
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/* import */
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extern char *client_version_string;
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extern char *server_version_string;
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extern Options options;
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/*
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* SSH2 key exchange
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*/
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2001-05-04 03:57:05 +00:00
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u_char *session_id2 = NULL;
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2004-01-07 11:10:17 +00:00
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u_int session_id2_len = 0;
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2000-05-15 04:37:24 +00:00
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2001-05-04 03:57:05 +00:00
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char *xxx_host;
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struct sockaddr *xxx_hostaddr;
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Kex *xxx_kex = NULL;
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2002-03-18 09:55:03 +00:00
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static int
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verify_host_key_callback(Key *hostkey)
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2001-05-04 03:57:05 +00:00
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{
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2002-03-18 09:55:03 +00:00
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if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1)
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fatal("Host key verification failed.");
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2001-05-04 03:57:05 +00:00
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return 0;
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}
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2000-05-15 04:37:24 +00:00
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void
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2000-12-05 02:20:19 +00:00
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ssh_kex2(char *host, struct sockaddr *hostaddr)
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{
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Kex *kex;
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2001-05-04 03:57:05 +00:00
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xxx_host = host;
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xxx_hostaddr = hostaddr;
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if (options.ciphers == (char *)-1) {
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2004-01-07 11:10:17 +00:00
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logit("No valid ciphers for protocol version 2 given, using defaults.");
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2001-05-04 03:57:05 +00:00
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options.ciphers = NULL;
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2000-12-05 02:20:19 +00:00
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}
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if (options.ciphers != NULL) {
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myproposal[PROPOSAL_ENC_ALGS_CTOS] =
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myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers;
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}
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2001-05-04 03:57:05 +00:00
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myproposal[PROPOSAL_ENC_ALGS_CTOS] =
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compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]);
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myproposal[PROPOSAL_ENC_ALGS_STOC] =
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compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]);
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2000-12-05 02:20:19 +00:00
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if (options.compression) {
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2001-05-04 03:57:05 +00:00
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myproposal[PROPOSAL_COMP_ALGS_CTOS] =
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2005-09-03 06:59:33 +00:00
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myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib@openssh.com,zlib,none";
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2000-12-05 02:20:19 +00:00
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} else {
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2001-05-04 03:57:05 +00:00
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myproposal[PROPOSAL_COMP_ALGS_CTOS] =
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2005-09-03 06:59:33 +00:00
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myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib@openssh.com,zlib";
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2000-12-05 02:20:19 +00:00
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}
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2001-05-04 03:57:05 +00:00
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if (options.macs != NULL) {
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myproposal[PROPOSAL_MAC_ALGS_CTOS] =
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myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs;
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2000-12-05 02:20:19 +00:00
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}
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2001-05-04 03:57:05 +00:00
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if (options.hostkeyalgorithms != NULL)
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2002-03-18 09:55:03 +00:00
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myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
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2001-05-04 03:57:05 +00:00
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options.hostkeyalgorithms;
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2000-12-05 02:20:19 +00:00
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2004-01-07 11:10:17 +00:00
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if (options.rekey_limit)
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2008-07-23 09:28:49 +00:00
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packet_set_rekey_limit((u_int32_t)options.rekey_limit);
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2004-01-07 11:10:17 +00:00
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2001-05-04 03:57:05 +00:00
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/* start key exchange */
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kex = kex_setup(myproposal);
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2003-04-23 16:53:02 +00:00
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kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
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2004-10-28 16:03:53 +00:00
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kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
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2003-04-23 16:53:02 +00:00
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kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
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2006-09-30 13:29:51 +00:00
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kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
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2001-05-04 03:57:05 +00:00
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kex->client_version_string=client_version_string;
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kex->server_version_string=server_version_string;
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2002-03-18 09:55:03 +00:00
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kex->verify_host_key=&verify_host_key_callback;
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2000-12-05 02:20:19 +00:00
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2001-05-04 03:57:05 +00:00
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xxx_kex = kex;
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2000-12-05 02:20:19 +00:00
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2001-05-04 03:57:05 +00:00
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dispatch_run(DISPATCH_BLOCK, &kex->done, kex);
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2010-03-08 11:19:52 +00:00
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if (options.use_roaming && !kex->roaming) {
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debug("Roaming not allowed by server");
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options.use_roaming = 0;
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}
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2001-05-04 03:57:05 +00:00
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session_id2 = kex->session_id;
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session_id2_len = kex->session_id_len;
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2000-12-05 02:20:19 +00:00
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#ifdef DEBUG_KEXDH
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/* send 1st encrypted/maced/compressed message */
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packet_start(SSH2_MSG_IGNORE);
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packet_put_cstring("markus");
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packet_send();
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packet_write_wait();
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#endif
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2000-05-15 04:37:24 +00:00
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}
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2000-06-03 09:52:37 +00:00
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2000-05-15 04:37:24 +00:00
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/*
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* Authenticate user
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*/
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2000-12-05 02:20:19 +00:00
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typedef struct Authctxt Authctxt;
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typedef struct Authmethod Authmethod;
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2004-01-07 11:10:17 +00:00
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typedef struct identity Identity;
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typedef struct idlist Idlist;
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struct identity {
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TAILQ_ENTRY(identity) next;
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AuthenticationConnection *ac; /* set if agent supports key */
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Key *key; /* public/private key */
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char *filename; /* comment for agent-only keys */
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int tried;
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int isprivate; /* key points to the private key */
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};
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TAILQ_HEAD(idlist, identity);
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2000-12-05 02:20:19 +00:00
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struct Authctxt {
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const char *server_user;
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2001-05-04 03:57:05 +00:00
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const char *local_user;
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2000-12-05 02:20:19 +00:00
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const char *host;
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const char *service;
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Authmethod *method;
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int success;
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2001-05-04 03:57:05 +00:00
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char *authlist;
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/* pubkey */
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2004-01-07 11:10:17 +00:00
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Idlist keys;
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2001-05-04 03:57:05 +00:00
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AuthenticationConnection *agent;
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/* hostbased */
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2002-06-23 14:01:54 +00:00
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Sensitive *sensitive;
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2002-03-18 09:55:03 +00:00
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/* kbd-interactive */
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int info_req_seen;
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2004-01-07 11:10:17 +00:00
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/* generic */
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void *methoddata;
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2000-12-05 02:20:19 +00:00
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};
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struct Authmethod {
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char *name; /* string to compare against server's list */
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int (*userauth)(Authctxt *authctxt);
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2009-02-24 18:49:27 +00:00
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void (*cleanup)(Authctxt *authctxt);
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2000-12-05 02:20:19 +00:00
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int *enabled; /* flag in option struct that enables method */
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int *batch_flag; /* flag in option struct that disables method */
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};
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2002-03-18 09:55:03 +00:00
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void input_userauth_success(int, u_int32_t, void *);
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2010-03-08 11:19:52 +00:00
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void input_userauth_success_unexpected(int, u_int32_t, void *);
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2002-03-18 09:55:03 +00:00
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void input_userauth_failure(int, u_int32_t, void *);
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void input_userauth_banner(int, u_int32_t, void *);
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void input_userauth_error(int, u_int32_t, void *);
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void input_userauth_info_req(int, u_int32_t, void *);
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void input_userauth_pk_ok(int, u_int32_t, void *);
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2002-06-23 14:01:54 +00:00
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void input_userauth_passwd_changereq(int, u_int32_t, void *);
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2009-02-24 18:49:27 +00:00
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void input_userauth_jpake_server_step1(int, u_int32_t, void *);
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void input_userauth_jpake_server_step2(int, u_int32_t, void *);
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void input_userauth_jpake_server_confirm(int, u_int32_t, void *);
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2000-12-05 02:20:19 +00:00
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2002-03-18 09:55:03 +00:00
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int userauth_none(Authctxt *);
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int userauth_pubkey(Authctxt *);
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int userauth_passwd(Authctxt *);
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int userauth_kbdint(Authctxt *);
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int userauth_hostbased(Authctxt *);
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2009-02-24 18:49:27 +00:00
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int userauth_jpake(Authctxt *);
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void userauth_jpake_cleanup(Authctxt *);
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2004-01-07 11:10:17 +00:00
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#ifdef GSSAPI
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int userauth_gssapi(Authctxt *authctxt);
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void input_gssapi_response(int type, u_int32_t, void *);
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void input_gssapi_token(int type, u_int32_t, void *);
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void input_gssapi_hash(int type, u_int32_t, void *);
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void input_gssapi_error(int, u_int32_t, void *);
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void input_gssapi_errtok(int, u_int32_t, void *);
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#endif
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2001-05-04 03:57:05 +00:00
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2002-03-18 09:55:03 +00:00
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void userauth(Authctxt *, char *);
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2001-05-04 03:57:05 +00:00
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2004-01-07 11:10:17 +00:00
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static int sign_and_send_pubkey(Authctxt *, Identity *);
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static void pubkey_prepare(Authctxt *);
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static void pubkey_cleanup(Authctxt *);
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static Key *load_identity_file(char *);
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2000-12-05 02:20:19 +00:00
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2002-03-18 09:55:03 +00:00
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static Authmethod *authmethod_get(char *authlist);
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static Authmethod *authmethod_lookup(const char *name);
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static char *authmethods_get(void);
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2000-12-05 02:20:19 +00:00
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Authmethod authmethods[] = {
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2004-01-07 11:10:17 +00:00
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#ifdef GSSAPI
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2004-02-26 10:38:49 +00:00
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{"gssapi-with-mic",
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2004-01-07 11:10:17 +00:00
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userauth_gssapi,
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2009-02-24 18:49:27 +00:00
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NULL,
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2004-01-07 11:10:17 +00:00
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&options.gss_authentication,
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NULL},
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#endif
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2002-03-18 09:55:03 +00:00
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{"hostbased",
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userauth_hostbased,
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2009-02-24 18:49:27 +00:00
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NULL,
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2002-03-18 09:55:03 +00:00
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&options.hostbased_authentication,
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NULL},
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2000-12-05 02:20:19 +00:00
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{"publickey",
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userauth_pubkey,
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2009-02-24 18:49:27 +00:00
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NULL,
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2001-05-04 03:57:05 +00:00
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&options.pubkey_authentication,
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2000-12-05 02:20:19 +00:00
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NULL},
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2009-02-24 18:49:27 +00:00
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|
|
#ifdef JPAKE
|
|
|
|
{"jpake-01@openssh.com",
|
|
|
|
userauth_jpake,
|
|
|
|
userauth_jpake_cleanup,
|
|
|
|
&options.zero_knowledge_password_authentication,
|
|
|
|
&options.batch_mode},
|
|
|
|
#endif
|
2000-12-05 02:20:19 +00:00
|
|
|
{"keyboard-interactive",
|
|
|
|
userauth_kbdint,
|
2009-02-24 18:49:27 +00:00
|
|
|
NULL,
|
2000-12-05 02:20:19 +00:00
|
|
|
&options.kbd_interactive_authentication,
|
|
|
|
&options.batch_mode},
|
2002-03-18 09:55:03 +00:00
|
|
|
{"password",
|
|
|
|
userauth_passwd,
|
2009-02-24 18:49:27 +00:00
|
|
|
NULL,
|
2002-03-18 09:55:03 +00:00
|
|
|
&options.password_authentication,
|
|
|
|
&options.batch_mode},
|
2000-12-05 02:20:19 +00:00
|
|
|
{"none",
|
|
|
|
userauth_none,
|
|
|
|
NULL,
|
2009-02-24 18:49:27 +00:00
|
|
|
NULL,
|
2000-12-05 02:20:19 +00:00
|
|
|
NULL},
|
2009-02-24 18:49:27 +00:00
|
|
|
{NULL, NULL, NULL, NULL, NULL}
|
2000-12-05 02:20:19 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
void
|
2001-05-04 03:57:05 +00:00
|
|
|
ssh_userauth2(const char *local_user, const char *server_user, char *host,
|
2002-06-23 14:01:54 +00:00
|
|
|
Sensitive *sensitive)
|
2000-12-05 02:20:19 +00:00
|
|
|
{
|
|
|
|
Authctxt authctxt;
|
|
|
|
int type;
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
if (options.challenge_response_authentication)
|
2001-05-04 03:57:05 +00:00
|
|
|
options.kbd_interactive_authentication = 1;
|
|
|
|
|
2000-12-05 02:20:19 +00:00
|
|
|
packet_start(SSH2_MSG_SERVICE_REQUEST);
|
|
|
|
packet_put_cstring("ssh-userauth");
|
|
|
|
packet_send();
|
2003-04-23 16:53:02 +00:00
|
|
|
debug("SSH2_MSG_SERVICE_REQUEST sent");
|
2000-12-05 02:20:19 +00:00
|
|
|
packet_write_wait();
|
2002-03-18 09:55:03 +00:00
|
|
|
type = packet_read();
|
2003-04-23 16:53:02 +00:00
|
|
|
if (type != SSH2_MSG_SERVICE_ACCEPT)
|
|
|
|
fatal("Server denied authentication request: %d", type);
|
2000-12-05 02:20:19 +00:00
|
|
|
if (packet_remaining() > 0) {
|
2002-03-18 09:55:03 +00:00
|
|
|
char *reply = packet_get_string(NULL);
|
2003-04-23 16:53:02 +00:00
|
|
|
debug2("service_accept: %s", reply);
|
2000-12-05 02:20:19 +00:00
|
|
|
xfree(reply);
|
|
|
|
} else {
|
2003-04-23 16:53:02 +00:00
|
|
|
debug2("buggy server: service_accept w/o service");
|
2000-12-05 02:20:19 +00:00
|
|
|
}
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_check_eom();
|
2003-04-23 16:53:02 +00:00
|
|
|
debug("SSH2_MSG_SERVICE_ACCEPT received");
|
2000-12-05 02:20:19 +00:00
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
if (options.preferred_authentications == NULL)
|
|
|
|
options.preferred_authentications = authmethods_get();
|
|
|
|
|
2000-12-05 02:20:19 +00:00
|
|
|
/* setup authentication context */
|
2002-03-18 09:55:03 +00:00
|
|
|
memset(&authctxt, 0, sizeof(authctxt));
|
2004-01-07 11:10:17 +00:00
|
|
|
pubkey_prepare(&authctxt);
|
2000-12-05 02:20:19 +00:00
|
|
|
authctxt.server_user = server_user;
|
2001-05-04 03:57:05 +00:00
|
|
|
authctxt.local_user = local_user;
|
2000-12-05 02:20:19 +00:00
|
|
|
authctxt.host = host;
|
|
|
|
authctxt.service = "ssh-connection"; /* service name */
|
|
|
|
authctxt.success = 0;
|
|
|
|
authctxt.method = authmethod_lookup("none");
|
2001-05-04 03:57:05 +00:00
|
|
|
authctxt.authlist = NULL;
|
2004-01-07 11:10:17 +00:00
|
|
|
authctxt.methoddata = NULL;
|
2002-06-23 14:01:54 +00:00
|
|
|
authctxt.sensitive = sensitive;
|
2002-03-18 09:55:03 +00:00
|
|
|
authctxt.info_req_seen = 0;
|
2000-12-05 02:20:19 +00:00
|
|
|
if (authctxt.method == NULL)
|
|
|
|
fatal("ssh_userauth2: internal error: cannot send userauth none request");
|
|
|
|
|
|
|
|
/* initial userauth request */
|
|
|
|
userauth_none(&authctxt);
|
|
|
|
|
|
|
|
dispatch_init(&input_userauth_error);
|
|
|
|
dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success);
|
|
|
|
dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure);
|
2001-05-04 03:57:05 +00:00
|
|
|
dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner);
|
2000-12-05 02:20:19 +00:00
|
|
|
dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */
|
|
|
|
|
2004-01-07 11:10:17 +00:00
|
|
|
pubkey_cleanup(&authctxt);
|
|
|
|
dispatch_range(SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL);
|
2000-12-05 02:20:19 +00:00
|
|
|
|
2003-04-23 16:53:02 +00:00
|
|
|
debug("Authentication succeeded (%s).", authctxt.method->name);
|
2001-05-04 03:57:05 +00:00
|
|
|
}
|
2004-01-07 11:10:17 +00:00
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
void
|
|
|
|
userauth(Authctxt *authctxt, char *authlist)
|
|
|
|
{
|
2009-02-24 18:49:27 +00:00
|
|
|
if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
|
|
|
|
authctxt->method->cleanup(authctxt);
|
|
|
|
|
2004-01-07 11:10:17 +00:00
|
|
|
if (authctxt->methoddata) {
|
|
|
|
xfree(authctxt->methoddata);
|
|
|
|
authctxt->methoddata = NULL;
|
|
|
|
}
|
2001-05-04 03:57:05 +00:00
|
|
|
if (authlist == NULL) {
|
|
|
|
authlist = authctxt->authlist;
|
|
|
|
} else {
|
|
|
|
if (authctxt->authlist)
|
|
|
|
xfree(authctxt->authlist);
|
|
|
|
authctxt->authlist = authlist;
|
|
|
|
}
|
|
|
|
for (;;) {
|
|
|
|
Authmethod *method = authmethod_get(authlist);
|
|
|
|
if (method == NULL)
|
|
|
|
fatal("Permission denied (%s).", authlist);
|
|
|
|
authctxt->method = method;
|
2004-01-07 11:10:17 +00:00
|
|
|
|
|
|
|
/* reset the per method handler */
|
|
|
|
dispatch_range(SSH2_MSG_USERAUTH_PER_METHOD_MIN,
|
|
|
|
SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL);
|
|
|
|
|
|
|
|
/* and try new method */
|
2001-05-04 03:57:05 +00:00
|
|
|
if (method->userauth(authctxt) != 0) {
|
|
|
|
debug2("we sent a %s packet, wait for reply", method->name);
|
|
|
|
break;
|
|
|
|
} else {
|
|
|
|
debug2("we did not send a packet, disable method");
|
|
|
|
method->enabled = NULL;
|
|
|
|
}
|
|
|
|
}
|
2000-12-05 02:20:19 +00:00
|
|
|
}
|
2002-06-29 11:34:13 +00:00
|
|
|
|
2009-02-24 18:49:27 +00:00
|
|
|
/* ARGSUSED */
|
2000-12-05 02:20:19 +00:00
|
|
|
void
|
2002-03-18 09:55:03 +00:00
|
|
|
input_userauth_error(int type, u_int32_t seq, void *ctxt)
|
2000-12-05 02:20:19 +00:00
|
|
|
{
|
2001-05-04 03:57:05 +00:00
|
|
|
fatal("input_userauth_error: bad message during authentication: "
|
2005-09-03 06:59:33 +00:00
|
|
|
"type %d", type);
|
2001-05-04 03:57:05 +00:00
|
|
|
}
|
2002-06-29 11:34:13 +00:00
|
|
|
|
2009-02-24 18:49:27 +00:00
|
|
|
/* ARGSUSED */
|
2001-05-04 03:57:05 +00:00
|
|
|
void
|
2002-03-18 09:55:03 +00:00
|
|
|
input_userauth_banner(int type, u_int32_t seq, void *ctxt)
|
2001-05-04 03:57:05 +00:00
|
|
|
{
|
2008-07-23 09:33:08 +00:00
|
|
|
char *msg, *raw, *lang;
|
|
|
|
u_int len;
|
2004-02-26 10:38:49 +00:00
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
debug3("input_userauth_banner");
|
2008-07-23 09:33:08 +00:00
|
|
|
raw = packet_get_string(&len);
|
2001-05-04 03:57:05 +00:00
|
|
|
lang = packet_get_string(NULL);
|
2009-02-24 18:49:27 +00:00
|
|
|
if (len > 0 && options.log_level >= SYSLOG_LEVEL_INFO) {
|
2008-07-23 09:33:08 +00:00
|
|
|
if (len > 65536)
|
|
|
|
len = 65536;
|
2008-09-24 21:17:14 +00:00
|
|
|
msg = xmalloc(len * 4 + 1); /* max expansion from strnvis() */
|
2010-03-08 11:19:52 +00:00
|
|
|
strnvis(msg, raw, len * 4 + 1, VIS_SAFE|VIS_OCTAL|VIS_NOSLASH);
|
2004-02-26 10:38:49 +00:00
|
|
|
fprintf(stderr, "%s", msg);
|
2008-07-23 09:33:08 +00:00
|
|
|
xfree(msg);
|
|
|
|
}
|
|
|
|
xfree(raw);
|
2001-05-04 03:57:05 +00:00
|
|
|
xfree(lang);
|
2000-12-05 02:20:19 +00:00
|
|
|
}
|
2002-06-29 11:34:13 +00:00
|
|
|
|
2009-02-24 18:49:27 +00:00
|
|
|
/* ARGSUSED */
|
2000-12-05 02:20:19 +00:00
|
|
|
void
|
2002-03-18 09:55:03 +00:00
|
|
|
input_userauth_success(int type, u_int32_t seq, void *ctxt)
|
2000-12-05 02:20:19 +00:00
|
|
|
{
|
|
|
|
Authctxt *authctxt = ctxt;
|
2010-03-08 11:19:52 +00:00
|
|
|
|
2000-12-05 02:20:19 +00:00
|
|
|
if (authctxt == NULL)
|
|
|
|
fatal("input_userauth_success: no authentication context");
|
2004-02-26 10:38:49 +00:00
|
|
|
if (authctxt->authlist) {
|
2001-05-04 03:57:05 +00:00
|
|
|
xfree(authctxt->authlist);
|
2004-02-26 10:38:49 +00:00
|
|
|
authctxt->authlist = NULL;
|
|
|
|
}
|
2010-03-08 11:19:52 +00:00
|
|
|
if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
|
|
|
|
authctxt->method->cleanup(authctxt);
|
2004-02-26 10:38:49 +00:00
|
|
|
if (authctxt->methoddata) {
|
2004-01-07 11:10:17 +00:00
|
|
|
xfree(authctxt->methoddata);
|
2004-02-26 10:38:49 +00:00
|
|
|
authctxt->methoddata = NULL;
|
|
|
|
}
|
2000-12-05 02:20:19 +00:00
|
|
|
authctxt->success = 1; /* break out */
|
|
|
|
}
|
2002-06-29 11:34:13 +00:00
|
|
|
|
2010-03-08 11:19:52 +00:00
|
|
|
void
|
|
|
|
input_userauth_success_unexpected(int type, u_int32_t seq, void *ctxt)
|
|
|
|
{
|
|
|
|
Authctxt *authctxt = ctxt;
|
|
|
|
|
|
|
|
if (authctxt == NULL)
|
|
|
|
fatal("%s: no authentication context", __func__);
|
|
|
|
|
|
|
|
fatal("Unexpected authentication success during %s.",
|
|
|
|
authctxt->method->name);
|
|
|
|
}
|
|
|
|
|
2009-02-24 18:49:27 +00:00
|
|
|
/* ARGSUSED */
|
2000-12-05 02:20:19 +00:00
|
|
|
void
|
2002-03-18 09:55:03 +00:00
|
|
|
input_userauth_failure(int type, u_int32_t seq, void *ctxt)
|
2000-12-05 02:20:19 +00:00
|
|
|
{
|
|
|
|
Authctxt *authctxt = ctxt;
|
|
|
|
char *authlist = NULL;
|
|
|
|
int partial;
|
|
|
|
|
|
|
|
if (authctxt == NULL)
|
|
|
|
fatal("input_userauth_failure: no authentication context");
|
|
|
|
|
|
|
|
authlist = packet_get_string(NULL);
|
|
|
|
partial = packet_get_char();
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_check_eom();
|
2000-12-05 02:20:19 +00:00
|
|
|
|
|
|
|
if (partial != 0)
|
2004-01-07 11:10:17 +00:00
|
|
|
logit("Authenticated with partial success.");
|
2003-04-23 16:53:02 +00:00
|
|
|
debug("Authentications that can continue: %s", authlist);
|
2000-12-05 02:20:19 +00:00
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
userauth(authctxt, authlist);
|
|
|
|
}
|
2009-02-24 18:49:27 +00:00
|
|
|
|
|
|
|
/* ARGSUSED */
|
2001-05-04 03:57:05 +00:00
|
|
|
void
|
2002-03-18 09:55:03 +00:00
|
|
|
input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt)
|
2001-05-04 03:57:05 +00:00
|
|
|
{
|
|
|
|
Authctxt *authctxt = ctxt;
|
|
|
|
Key *key = NULL;
|
2004-01-07 11:10:17 +00:00
|
|
|
Identity *id = NULL;
|
2001-05-04 03:57:05 +00:00
|
|
|
Buffer b;
|
2002-03-18 09:55:03 +00:00
|
|
|
int pktype, sent = 0;
|
|
|
|
u_int alen, blen;
|
|
|
|
char *pkalg, *fp;
|
|
|
|
u_char *pkblob;
|
2001-05-04 03:57:05 +00:00
|
|
|
|
|
|
|
if (authctxt == NULL)
|
|
|
|
fatal("input_userauth_pk_ok: no authentication context");
|
|
|
|
if (datafellows & SSH_BUG_PKOK) {
|
|
|
|
/* this is similar to SSH_BUG_PKAUTH */
|
|
|
|
debug2("input_userauth_pk_ok: SSH_BUG_PKOK");
|
|
|
|
pkblob = packet_get_string(&blen);
|
|
|
|
buffer_init(&b);
|
|
|
|
buffer_append(&b, pkblob, blen);
|
|
|
|
pkalg = buffer_get_string(&b, &alen);
|
|
|
|
buffer_free(&b);
|
|
|
|
} else {
|
|
|
|
pkalg = packet_get_string(&alen);
|
|
|
|
pkblob = packet_get_string(&blen);
|
|
|
|
}
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_check_eom();
|
2001-05-04 03:57:05 +00:00
|
|
|
|
2004-01-07 11:10:17 +00:00
|
|
|
debug("Server accepts key: pkalg %s blen %u", pkalg, blen);
|
2001-05-04 03:57:05 +00:00
|
|
|
|
2004-01-07 11:10:17 +00:00
|
|
|
if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) {
|
|
|
|
debug("unknown pkalg %s", pkalg);
|
|
|
|
goto done;
|
|
|
|
}
|
|
|
|
if ((key = key_from_blob(pkblob, blen)) == NULL) {
|
|
|
|
debug("no key from blob. pkalg %s", pkalg);
|
|
|
|
goto done;
|
|
|
|
}
|
|
|
|
if (key->type != pktype) {
|
|
|
|
error("input_userauth_pk_ok: type mismatch "
|
|
|
|
"for decoded key (received %d, expected %d)",
|
|
|
|
key->type, pktype);
|
|
|
|
goto done;
|
|
|
|
}
|
|
|
|
fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX);
|
|
|
|
debug2("input_userauth_pk_ok: fp %s", fp);
|
|
|
|
xfree(fp);
|
|
|
|
|
2004-02-26 10:38:49 +00:00
|
|
|
/*
|
|
|
|
* search keys in the reverse order, because last candidate has been
|
|
|
|
* moved to the end of the queue. this also avoids confusion by
|
|
|
|
* duplicate keys
|
|
|
|
*/
|
2004-10-28 16:03:53 +00:00
|
|
|
TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) {
|
2004-01-07 11:10:17 +00:00
|
|
|
if (key_equal(key, id->key)) {
|
|
|
|
sent = sign_and_send_pubkey(authctxt, id);
|
2001-05-04 03:57:05 +00:00
|
|
|
break;
|
|
|
|
}
|
2004-01-07 11:10:17 +00:00
|
|
|
}
|
|
|
|
done:
|
2001-05-04 03:57:05 +00:00
|
|
|
if (key != NULL)
|
|
|
|
key_free(key);
|
|
|
|
xfree(pkalg);
|
|
|
|
xfree(pkblob);
|
|
|
|
|
2002-10-29 09:43:00 +00:00
|
|
|
/* try another method if we did not send a packet */
|
2001-05-04 03:57:05 +00:00
|
|
|
if (sent == 0)
|
|
|
|
userauth(authctxt, NULL);
|
2004-01-07 11:10:17 +00:00
|
|
|
}
|
|
|
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#ifdef GSSAPI
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2004-02-26 10:38:49 +00:00
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int
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2004-01-07 11:10:17 +00:00
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userauth_gssapi(Authctxt *authctxt)
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{
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Gssctxt *gssctxt = NULL;
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2004-02-26 10:38:49 +00:00
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static gss_OID_set gss_supported = NULL;
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2005-09-03 06:59:33 +00:00
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static u_int mech = 0;
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2004-01-07 11:10:17 +00:00
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OM_uint32 min;
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int ok = 0;
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/* Try one GSSAPI method at a time, rather than sending them all at
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* once. */
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2004-02-26 10:38:49 +00:00
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if (gss_supported == NULL)
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gss_indicate_mechs(&min, &gss_supported);
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2004-01-07 11:10:17 +00:00
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/* Check to see if the mechanism is usable before we offer it */
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2004-02-26 10:38:49 +00:00
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while (mech < gss_supported->count && !ok) {
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2004-01-07 11:10:17 +00:00
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/* My DER encoding requires length<128 */
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2004-02-26 10:38:49 +00:00
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if (gss_supported->elements[mech].length < 128 &&
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2006-09-30 13:29:51 +00:00
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ssh_gssapi_check_mechanism(&gssctxt,
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&gss_supported->elements[mech], authctxt->host)) {
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2004-01-07 11:10:17 +00:00
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ok = 1; /* Mechanism works */
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} else {
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mech++;
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}
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}
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2005-09-03 06:59:33 +00:00
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if (!ok)
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return 0;
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2004-01-07 11:10:17 +00:00
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authctxt->methoddata=(void *)gssctxt;
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packet_start(SSH2_MSG_USERAUTH_REQUEST);
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packet_put_cstring(authctxt->server_user);
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packet_put_cstring(authctxt->service);
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packet_put_cstring(authctxt->method->name);
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packet_put_int(1);
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2004-02-26 10:38:49 +00:00
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packet_put_int((gss_supported->elements[mech].length) + 2);
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packet_put_char(SSH_GSS_OIDTYPE);
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packet_put_char(gss_supported->elements[mech].length);
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packet_put_raw(gss_supported->elements[mech].elements,
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gss_supported->elements[mech].length);
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2004-01-07 11:10:17 +00:00
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packet_send();
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dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response);
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dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token);
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dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error);
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dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok);
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mech++; /* Move along to next candidate */
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return 1;
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}
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2004-02-26 10:38:49 +00:00
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static OM_uint32
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process_gssapi_token(void *ctxt, gss_buffer_t recv_tok)
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{
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Authctxt *authctxt = ctxt;
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Gssctxt *gssctxt = authctxt->methoddata;
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gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
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2005-09-03 06:59:33 +00:00
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gss_buffer_desc mic = GSS_C_EMPTY_BUFFER;
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gss_buffer_desc gssbuf;
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2004-02-26 10:38:49 +00:00
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OM_uint32 status, ms, flags;
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Buffer b;
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status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
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recv_tok, &send_tok, &flags);
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if (send_tok.length > 0) {
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if (GSS_ERROR(status))
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packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK);
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else
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packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN);
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packet_put_string(send_tok.value, send_tok.length);
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packet_send();
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gss_release_buffer(&ms, &send_tok);
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}
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if (status == GSS_S_COMPLETE) {
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/* send either complete or MIC, depending on mechanism */
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if (!(flags & GSS_C_INTEG_FLAG)) {
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packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE);
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packet_send();
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} else {
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ssh_gssapi_buildmic(&b, authctxt->server_user,
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authctxt->service, "gssapi-with-mic");
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gssbuf.value = buffer_ptr(&b);
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gssbuf.length = buffer_len(&b);
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status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic);
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if (!GSS_ERROR(status)) {
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packet_start(SSH2_MSG_USERAUTH_GSSAPI_MIC);
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packet_put_string(mic.value, mic.length);
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packet_send();
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}
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buffer_free(&b);
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gss_release_buffer(&ms, &mic);
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}
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}
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return status;
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}
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2009-02-24 18:49:27 +00:00
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/* ARGSUSED */
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2004-01-07 11:10:17 +00:00
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void
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input_gssapi_response(int type, u_int32_t plen, void *ctxt)
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{
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Authctxt *authctxt = ctxt;
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Gssctxt *gssctxt;
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int oidlen;
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char *oidv;
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if (authctxt == NULL)
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fatal("input_gssapi_response: no authentication context");
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gssctxt = authctxt->methoddata;
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/* Setup our OID */
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oidv = packet_get_string(&oidlen);
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2004-02-26 10:38:49 +00:00
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if (oidlen <= 2 ||
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oidv[0] != SSH_GSS_OIDTYPE ||
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oidv[1] != oidlen - 2) {
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xfree(oidv);
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debug("Badly encoded mechanism OID received");
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userauth(authctxt, NULL);
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return;
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2004-01-07 11:10:17 +00:00
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}
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2004-02-26 10:38:49 +00:00
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if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2))
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fatal("Server returned different OID than expected");
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2004-01-07 11:10:17 +00:00
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packet_check_eom();
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xfree(oidv);
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2004-02-26 10:38:49 +00:00
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if (GSS_ERROR(process_gssapi_token(ctxt, GSS_C_NO_BUFFER))) {
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2004-01-07 11:10:17 +00:00
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/* Start again with next method on list */
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debug("Trying to start again");
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userauth(authctxt, NULL);
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return;
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}
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}
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2009-02-24 18:49:27 +00:00
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/* ARGSUSED */
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2004-01-07 11:10:17 +00:00
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void
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input_gssapi_token(int type, u_int32_t plen, void *ctxt)
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{
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Authctxt *authctxt = ctxt;
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gss_buffer_desc recv_tok;
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2004-02-26 10:38:49 +00:00
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OM_uint32 status;
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2004-01-07 11:10:17 +00:00
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u_int slen;
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if (authctxt == NULL)
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fatal("input_gssapi_response: no authentication context");
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recv_tok.value = packet_get_string(&slen);
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recv_tok.length = slen; /* safe typecast */
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packet_check_eom();
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2004-02-26 10:38:49 +00:00
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status = process_gssapi_token(ctxt, &recv_tok);
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2004-01-07 11:10:17 +00:00
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xfree(recv_tok.value);
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if (GSS_ERROR(status)) {
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/* Start again with the next method in the list */
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userauth(authctxt, NULL);
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return;
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}
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2000-12-05 02:20:19 +00:00
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}
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2009-02-24 18:49:27 +00:00
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/* ARGSUSED */
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2004-01-07 11:10:17 +00:00
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void
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input_gssapi_errtok(int type, u_int32_t plen, void *ctxt)
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{
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Authctxt *authctxt = ctxt;
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Gssctxt *gssctxt;
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gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
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gss_buffer_desc recv_tok;
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OM_uint32 status, ms;
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u_int len;
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if (authctxt == NULL)
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fatal("input_gssapi_response: no authentication context");
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gssctxt = authctxt->methoddata;
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recv_tok.value = packet_get_string(&len);
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recv_tok.length = len;
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packet_check_eom();
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/* Stick it into GSSAPI and see what it says */
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status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
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2005-09-03 06:59:33 +00:00
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&recv_tok, &send_tok, NULL);
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2004-01-07 11:10:17 +00:00
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xfree(recv_tok.value);
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gss_release_buffer(&ms, &send_tok);
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/* Server will be returning a failed packet after this one */
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}
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2009-02-24 18:49:27 +00:00
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/* ARGSUSED */
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2004-01-07 11:10:17 +00:00
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void
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input_gssapi_error(int type, u_int32_t plen, void *ctxt)
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{
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OM_uint32 maj, min;
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char *msg;
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char *lang;
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maj=packet_get_int();
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min=packet_get_int();
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msg=packet_get_string(NULL);
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lang=packet_get_string(NULL);
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packet_check_eom();
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2006-03-22 19:46:12 +00:00
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debug("Server GSSAPI Error:\n%s", msg);
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2004-01-07 11:10:17 +00:00
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xfree(msg);
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xfree(lang);
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}
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#endif /* GSSAPI */
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2000-12-05 02:20:19 +00:00
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int
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userauth_none(Authctxt *authctxt)
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{
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/* initial userauth request */
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packet_start(SSH2_MSG_USERAUTH_REQUEST);
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packet_put_cstring(authctxt->server_user);
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packet_put_cstring(authctxt->service);
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packet_put_cstring(authctxt->method->name);
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packet_send();
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return 1;
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}
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2000-05-15 04:37:24 +00:00
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int
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2000-12-05 02:20:19 +00:00
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userauth_passwd(Authctxt *authctxt)
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2000-05-15 04:37:24 +00:00
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{
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static int attempt = 0;
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2002-06-23 14:01:54 +00:00
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char prompt[150];
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2000-05-15 04:37:24 +00:00
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char *password;
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2010-03-08 11:19:52 +00:00
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const char *host = options.host_key_alias ? options.host_key_alias :
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authctxt->host;
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2000-05-15 04:37:24 +00:00
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2000-09-10 08:31:17 +00:00
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if (attempt++ >= options.number_of_password_prompts)
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2000-05-15 04:37:24 +00:00
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return 0;
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2002-03-18 09:55:03 +00:00
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if (attempt != 1)
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2000-09-10 08:31:17 +00:00
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error("Permission denied, please try again.");
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2001-05-04 03:57:05 +00:00
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snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ",
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2010-03-08 11:19:52 +00:00
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authctxt->server_user, host);
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2000-05-15 04:37:24 +00:00
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password = read_passphrase(prompt, 0);
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packet_start(SSH2_MSG_USERAUTH_REQUEST);
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2000-12-05 02:20:19 +00:00
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packet_put_cstring(authctxt->server_user);
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packet_put_cstring(authctxt->service);
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packet_put_cstring(authctxt->method->name);
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2000-05-15 04:37:24 +00:00
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packet_put_char(0);
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packet_put_cstring(password);
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memset(password, 0, strlen(password));
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xfree(password);
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2002-03-18 09:55:03 +00:00
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packet_add_padding(64);
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2000-05-15 04:37:24 +00:00
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packet_send();
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2002-06-23 14:01:54 +00:00
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dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
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&input_userauth_passwd_changereq);
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2000-05-15 04:37:24 +00:00
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return 1;
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}
|
2009-02-24 18:49:27 +00:00
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2002-06-23 14:01:54 +00:00
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/*
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* parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST
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*/
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2009-02-24 18:49:27 +00:00
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/* ARGSUSED */
|
2002-06-23 14:01:54 +00:00
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void
|
2002-06-27 22:31:32 +00:00
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input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt)
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2002-06-23 14:01:54 +00:00
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{
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Authctxt *authctxt = ctxt;
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char *info, *lang, *password = NULL, *retype = NULL;
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char prompt[150];
|
2010-03-08 11:19:52 +00:00
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const char *host = options.host_key_alias ? options.host_key_alias :
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authctxt->host;
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2002-06-23 14:01:54 +00:00
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debug2("input_userauth_passwd_changereq");
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if (authctxt == NULL)
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fatal("input_userauth_passwd_changereq: "
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"no authentication context");
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info = packet_get_string(NULL);
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lang = packet_get_string(NULL);
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if (strlen(info) > 0)
|
2004-01-07 11:10:17 +00:00
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logit("%s", info);
|
2002-06-23 14:01:54 +00:00
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xfree(info);
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xfree(lang);
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packet_start(SSH2_MSG_USERAUTH_REQUEST);
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packet_put_cstring(authctxt->server_user);
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packet_put_cstring(authctxt->service);
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packet_put_cstring(authctxt->method->name);
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packet_put_char(1); /* additional info */
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snprintf(prompt, sizeof(prompt),
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|
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"Enter %.30s@%.128s's old password: ",
|
2010-03-08 11:19:52 +00:00
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authctxt->server_user, host);
|
2002-06-23 14:01:54 +00:00
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password = read_passphrase(prompt, 0);
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packet_put_cstring(password);
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memset(password, 0, strlen(password));
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xfree(password);
|
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password = NULL;
|
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|
|
while (password == NULL) {
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snprintf(prompt, sizeof(prompt),
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|
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"Enter %.30s@%.128s's new password: ",
|
2010-03-08 11:19:52 +00:00
|
|
|
authctxt->server_user, host);
|
2002-06-23 14:01:54 +00:00
|
|
|
password = read_passphrase(prompt, RP_ALLOW_EOF);
|
|
|
|
if (password == NULL) {
|
|
|
|
/* bail out */
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
snprintf(prompt, sizeof(prompt),
|
|
|
|
"Retype %.30s@%.128s's new password: ",
|
2010-03-08 11:19:52 +00:00
|
|
|
authctxt->server_user, host);
|
2002-06-23 14:01:54 +00:00
|
|
|
retype = read_passphrase(prompt, 0);
|
|
|
|
if (strcmp(password, retype) != 0) {
|
|
|
|
memset(password, 0, strlen(password));
|
|
|
|
xfree(password);
|
2004-01-07 11:10:17 +00:00
|
|
|
logit("Mismatch; try again, EOF to quit.");
|
2002-06-23 14:01:54 +00:00
|
|
|
password = NULL;
|
|
|
|
}
|
|
|
|
memset(retype, 0, strlen(retype));
|
|
|
|
xfree(retype);
|
|
|
|
}
|
|
|
|
packet_put_cstring(password);
|
|
|
|
memset(password, 0, strlen(password));
|
|
|
|
xfree(password);
|
|
|
|
packet_add_padding(64);
|
|
|
|
packet_send();
|
|
|
|
|
|
|
|
dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
|
|
|
|
&input_userauth_passwd_changereq);
|
|
|
|
}
|
2000-05-15 04:37:24 +00:00
|
|
|
|
2009-02-24 18:49:27 +00:00
|
|
|
#ifdef JPAKE
|
|
|
|
static char *
|
|
|
|
pw_encrypt(const char *password, const char *crypt_scheme, const char *salt)
|
|
|
|
{
|
|
|
|
/* OpenBSD crypt(3) handles all of these */
|
|
|
|
if (strcmp(crypt_scheme, "crypt") == 0 ||
|
|
|
|
strcmp(crypt_scheme, "bcrypt") == 0 ||
|
|
|
|
strcmp(crypt_scheme, "md5crypt") == 0 ||
|
|
|
|
strcmp(crypt_scheme, "crypt-extended") == 0)
|
|
|
|
return xstrdup(crypt(password, salt));
|
|
|
|
error("%s: unsupported password encryption scheme \"%.100s\"",
|
|
|
|
__func__, crypt_scheme);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static BIGNUM *
|
|
|
|
jpake_password_to_secret(Authctxt *authctxt, const char *crypt_scheme,
|
|
|
|
const char *salt)
|
|
|
|
{
|
|
|
|
char prompt[256], *password, *crypted;
|
|
|
|
u_char *secret;
|
|
|
|
u_int secret_len;
|
|
|
|
BIGNUM *ret;
|
|
|
|
|
|
|
|
snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password (JPAKE): ",
|
|
|
|
authctxt->server_user, authctxt->host);
|
|
|
|
password = read_passphrase(prompt, 0);
|
|
|
|
|
|
|
|
if ((crypted = pw_encrypt(password, crypt_scheme, salt)) == NULL) {
|
|
|
|
logit("Disabling %s authentication", authctxt->method->name);
|
|
|
|
authctxt->method->enabled = NULL;
|
|
|
|
/* Continue with an empty password to fail gracefully */
|
|
|
|
crypted = xstrdup("");
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef JPAKE_DEBUG
|
|
|
|
debug3("%s: salt = %s", __func__, salt);
|
|
|
|
debug3("%s: scheme = %s", __func__, crypt_scheme);
|
|
|
|
debug3("%s: crypted = %s", __func__, crypted);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
if (hash_buffer(crypted, strlen(crypted), EVP_sha256(),
|
|
|
|
&secret, &secret_len) != 0)
|
|
|
|
fatal("%s: hash_buffer", __func__);
|
|
|
|
|
|
|
|
bzero(password, strlen(password));
|
|
|
|
bzero(crypted, strlen(crypted));
|
|
|
|
xfree(password);
|
|
|
|
xfree(crypted);
|
|
|
|
|
|
|
|
if ((ret = BN_bin2bn(secret, secret_len, NULL)) == NULL)
|
|
|
|
fatal("%s: BN_bin2bn (secret)", __func__);
|
|
|
|
bzero(secret, secret_len);
|
|
|
|
xfree(secret);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* ARGSUSED */
|
|
|
|
void
|
|
|
|
input_userauth_jpake_server_step1(int type, u_int32_t seq, void *ctxt)
|
|
|
|
{
|
|
|
|
Authctxt *authctxt = ctxt;
|
|
|
|
struct jpake_ctx *pctx = authctxt->methoddata;
|
|
|
|
u_char *x3_proof, *x4_proof, *x2_s_proof;
|
|
|
|
u_int x3_proof_len, x4_proof_len, x2_s_proof_len;
|
|
|
|
char *crypt_scheme, *salt;
|
|
|
|
|
|
|
|
/* Disable this message */
|
|
|
|
dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_STEP1, NULL);
|
|
|
|
|
|
|
|
if ((pctx->g_x3 = BN_new()) == NULL ||
|
|
|
|
(pctx->g_x4 = BN_new()) == NULL)
|
|
|
|
fatal("%s: BN_new", __func__);
|
|
|
|
|
|
|
|
/* Fetch step 1 values */
|
|
|
|
crypt_scheme = packet_get_string(NULL);
|
|
|
|
salt = packet_get_string(NULL);
|
|
|
|
pctx->server_id = packet_get_string(&pctx->server_id_len);
|
|
|
|
packet_get_bignum2(pctx->g_x3);
|
|
|
|
packet_get_bignum2(pctx->g_x4);
|
|
|
|
x3_proof = packet_get_string(&x3_proof_len);
|
|
|
|
x4_proof = packet_get_string(&x4_proof_len);
|
|
|
|
packet_check_eom();
|
|
|
|
|
|
|
|
JPAKE_DEBUG_CTX((pctx, "step 1 received in %s", __func__));
|
|
|
|
|
|
|
|
/* Obtain password and derive secret */
|
|
|
|
pctx->s = jpake_password_to_secret(authctxt, crypt_scheme, salt);
|
|
|
|
bzero(crypt_scheme, strlen(crypt_scheme));
|
|
|
|
bzero(salt, strlen(salt));
|
|
|
|
xfree(crypt_scheme);
|
|
|
|
xfree(salt);
|
|
|
|
JPAKE_DEBUG_BN((pctx->s, "%s: s = ", __func__));
|
|
|
|
|
|
|
|
/* Calculate step 2 values */
|
|
|
|
jpake_step2(pctx->grp, pctx->s, pctx->g_x1,
|
|
|
|
pctx->g_x3, pctx->g_x4, pctx->x2,
|
|
|
|
pctx->server_id, pctx->server_id_len,
|
|
|
|
pctx->client_id, pctx->client_id_len,
|
|
|
|
x3_proof, x3_proof_len,
|
|
|
|
x4_proof, x4_proof_len,
|
|
|
|
&pctx->a,
|
|
|
|
&x2_s_proof, &x2_s_proof_len);
|
|
|
|
|
|
|
|
bzero(x3_proof, x3_proof_len);
|
|
|
|
bzero(x4_proof, x4_proof_len);
|
|
|
|
xfree(x3_proof);
|
|
|
|
xfree(x4_proof);
|
|
|
|
|
|
|
|
JPAKE_DEBUG_CTX((pctx, "step 2 sending in %s", __func__));
|
|
|
|
|
|
|
|
/* Send values for step 2 */
|
|
|
|
packet_start(SSH2_MSG_USERAUTH_JPAKE_CLIENT_STEP2);
|
|
|
|
packet_put_bignum2(pctx->a);
|
|
|
|
packet_put_string(x2_s_proof, x2_s_proof_len);
|
|
|
|
packet_send();
|
|
|
|
|
|
|
|
bzero(x2_s_proof, x2_s_proof_len);
|
|
|
|
xfree(x2_s_proof);
|
|
|
|
|
|
|
|
/* Expect step 2 packet from peer */
|
|
|
|
dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_STEP2,
|
|
|
|
input_userauth_jpake_server_step2);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* ARGSUSED */
|
|
|
|
void
|
|
|
|
input_userauth_jpake_server_step2(int type, u_int32_t seq, void *ctxt)
|
|
|
|
{
|
|
|
|
Authctxt *authctxt = ctxt;
|
|
|
|
struct jpake_ctx *pctx = authctxt->methoddata;
|
|
|
|
u_char *x4_s_proof;
|
|
|
|
u_int x4_s_proof_len;
|
|
|
|
|
|
|
|
/* Disable this message */
|
|
|
|
dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_STEP2, NULL);
|
|
|
|
|
|
|
|
if ((pctx->b = BN_new()) == NULL)
|
|
|
|
fatal("%s: BN_new", __func__);
|
|
|
|
|
|
|
|
/* Fetch step 2 values */
|
|
|
|
packet_get_bignum2(pctx->b);
|
|
|
|
x4_s_proof = packet_get_string(&x4_s_proof_len);
|
|
|
|
packet_check_eom();
|
|
|
|
|
|
|
|
JPAKE_DEBUG_CTX((pctx, "step 2 received in %s", __func__));
|
|
|
|
|
|
|
|
/* Derive shared key and calculate confirmation hash */
|
|
|
|
jpake_key_confirm(pctx->grp, pctx->s, pctx->b,
|
|
|
|
pctx->x2, pctx->g_x1, pctx->g_x2, pctx->g_x3, pctx->g_x4,
|
|
|
|
pctx->client_id, pctx->client_id_len,
|
|
|
|
pctx->server_id, pctx->server_id_len,
|
|
|
|
session_id2, session_id2_len,
|
|
|
|
x4_s_proof, x4_s_proof_len,
|
|
|
|
&pctx->k,
|
|
|
|
&pctx->h_k_cid_sessid, &pctx->h_k_cid_sessid_len);
|
|
|
|
|
|
|
|
bzero(x4_s_proof, x4_s_proof_len);
|
|
|
|
xfree(x4_s_proof);
|
|
|
|
|
|
|
|
JPAKE_DEBUG_CTX((pctx, "confirm sending in %s", __func__));
|
|
|
|
|
|
|
|
/* Send key confirmation proof */
|
|
|
|
packet_start(SSH2_MSG_USERAUTH_JPAKE_CLIENT_CONFIRM);
|
|
|
|
packet_put_string(pctx->h_k_cid_sessid, pctx->h_k_cid_sessid_len);
|
|
|
|
packet_send();
|
|
|
|
|
|
|
|
/* Expect confirmation from peer */
|
|
|
|
dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_CONFIRM,
|
|
|
|
input_userauth_jpake_server_confirm);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* ARGSUSED */
|
|
|
|
void
|
|
|
|
input_userauth_jpake_server_confirm(int type, u_int32_t seq, void *ctxt)
|
|
|
|
{
|
|
|
|
Authctxt *authctxt = ctxt;
|
|
|
|
struct jpake_ctx *pctx = authctxt->methoddata;
|
|
|
|
|
|
|
|
/* Disable this message */
|
|
|
|
dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_CONFIRM, NULL);
|
|
|
|
|
|
|
|
pctx->h_k_sid_sessid = packet_get_string(&pctx->h_k_sid_sessid_len);
|
|
|
|
packet_check_eom();
|
|
|
|
|
|
|
|
JPAKE_DEBUG_CTX((pctx, "confirm received in %s", __func__));
|
|
|
|
|
|
|
|
/* Verify expected confirmation hash */
|
|
|
|
if (jpake_check_confirm(pctx->k,
|
|
|
|
pctx->server_id, pctx->server_id_len,
|
|
|
|
session_id2, session_id2_len,
|
|
|
|
pctx->h_k_sid_sessid, pctx->h_k_sid_sessid_len) == 1)
|
|
|
|
debug("%s: %s success", __func__, authctxt->method->name);
|
|
|
|
else {
|
|
|
|
debug("%s: confirmation mismatch", __func__);
|
|
|
|
/* XXX stash this so if auth succeeds then we can warn/kill */
|
|
|
|
}
|
|
|
|
|
|
|
|
userauth_jpake_cleanup(authctxt);
|
|
|
|
}
|
|
|
|
#endif /* JPAKE */
|
|
|
|
|
2004-01-07 11:10:17 +00:00
|
|
|
static int
|
|
|
|
identity_sign(Identity *id, u_char **sigp, u_int *lenp,
|
|
|
|
u_char *data, u_int datalen)
|
2001-05-04 03:57:05 +00:00
|
|
|
{
|
2004-01-07 11:10:17 +00:00
|
|
|
Key *prv;
|
|
|
|
int ret;
|
2002-06-23 14:01:54 +00:00
|
|
|
|
2004-01-07 11:10:17 +00:00
|
|
|
/* the agent supports this key */
|
|
|
|
if (id->ac)
|
|
|
|
return (ssh_agent_sign(id->ac, id->key, sigp, lenp,
|
|
|
|
data, datalen));
|
|
|
|
/*
|
|
|
|
* we have already loaded the private key or
|
|
|
|
* the private key is stored in external hardware
|
|
|
|
*/
|
|
|
|
if (id->isprivate || (id->key->flags & KEY_FLAG_EXT))
|
|
|
|
return (key_sign(id->key, sigp, lenp, data, datalen));
|
|
|
|
/* load the private key from the file */
|
|
|
|
if ((prv = load_identity_file(id->filename)) == NULL)
|
|
|
|
return (-1);
|
|
|
|
ret = key_sign(prv, sigp, lenp, data, datalen);
|
|
|
|
key_free(prv);
|
|
|
|
return (ret);
|
2001-05-04 03:57:05 +00:00
|
|
|
}
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
static int
|
2004-01-07 11:10:17 +00:00
|
|
|
sign_and_send_pubkey(Authctxt *authctxt, Identity *id)
|
2000-05-15 04:37:24 +00:00
|
|
|
{
|
|
|
|
Buffer b;
|
2001-05-04 03:57:05 +00:00
|
|
|
u_char *blob, *signature;
|
2002-03-18 09:55:03 +00:00
|
|
|
u_int bloblen, slen;
|
2004-01-07 11:10:17 +00:00
|
|
|
u_int skip = 0;
|
2000-09-10 08:31:17 +00:00
|
|
|
int ret = -1;
|
2000-12-05 02:20:19 +00:00
|
|
|
int have_sig = 1;
|
2000-05-15 04:37:24 +00:00
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
debug3("sign_and_send_pubkey");
|
2000-05-15 04:37:24 +00:00
|
|
|
|
2004-01-07 11:10:17 +00:00
|
|
|
if (key_to_blob(id->key, &blob, &bloblen) == 0) {
|
2001-05-04 03:57:05 +00:00
|
|
|
/* we cannot handle this key */
|
|
|
|
debug3("sign_and_send_pubkey: cannot handle key");
|
|
|
|
return 0;
|
|
|
|
}
|
2000-05-15 04:37:24 +00:00
|
|
|
/* data to be signed */
|
|
|
|
buffer_init(&b);
|
2000-12-05 02:20:19 +00:00
|
|
|
if (datafellows & SSH_OLD_SESSIONID) {
|
2000-09-10 08:31:17 +00:00
|
|
|
buffer_append(&b, session_id2, session_id2_len);
|
2001-05-04 03:57:05 +00:00
|
|
|
skip = session_id2_len;
|
2000-12-05 02:20:19 +00:00
|
|
|
} else {
|
|
|
|
buffer_put_string(&b, session_id2, session_id2_len);
|
|
|
|
skip = buffer_len(&b);
|
2000-09-10 08:31:17 +00:00
|
|
|
}
|
2000-05-15 04:37:24 +00:00
|
|
|
buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
|
2000-12-05 02:20:19 +00:00
|
|
|
buffer_put_cstring(&b, authctxt->server_user);
|
2000-05-15 04:37:24 +00:00
|
|
|
buffer_put_cstring(&b,
|
2001-05-04 03:57:05 +00:00
|
|
|
datafellows & SSH_BUG_PKSERVICE ?
|
2000-05-15 04:37:24 +00:00
|
|
|
"ssh-userauth" :
|
2000-12-05 02:20:19 +00:00
|
|
|
authctxt->service);
|
2001-05-04 03:57:05 +00:00
|
|
|
if (datafellows & SSH_BUG_PKAUTH) {
|
|
|
|
buffer_put_char(&b, have_sig);
|
|
|
|
} else {
|
|
|
|
buffer_put_cstring(&b, authctxt->method->name);
|
|
|
|
buffer_put_char(&b, have_sig);
|
2004-01-07 11:10:17 +00:00
|
|
|
buffer_put_cstring(&b, key_ssh_name(id->key));
|
2001-05-04 03:57:05 +00:00
|
|
|
}
|
2000-05-15 04:37:24 +00:00
|
|
|
buffer_put_string(&b, blob, bloblen);
|
|
|
|
|
|
|
|
/* generate signature */
|
2004-01-07 11:10:17 +00:00
|
|
|
ret = identity_sign(id, &signature, &slen,
|
2001-05-04 03:57:05 +00:00
|
|
|
buffer_ptr(&b), buffer_len(&b));
|
2000-09-10 08:31:17 +00:00
|
|
|
if (ret == -1) {
|
|
|
|
xfree(blob);
|
|
|
|
buffer_free(&b);
|
|
|
|
return 0;
|
|
|
|
}
|
2001-05-04 03:57:05 +00:00
|
|
|
#ifdef DEBUG_PK
|
2000-05-15 04:37:24 +00:00
|
|
|
buffer_dump(&b);
|
|
|
|
#endif
|
2001-05-04 03:57:05 +00:00
|
|
|
if (datafellows & SSH_BUG_PKSERVICE) {
|
2000-05-15 04:37:24 +00:00
|
|
|
buffer_clear(&b);
|
|
|
|
buffer_append(&b, session_id2, session_id2_len);
|
2001-05-04 03:57:05 +00:00
|
|
|
skip = session_id2_len;
|
2000-05-15 04:37:24 +00:00
|
|
|
buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
|
2000-12-05 02:20:19 +00:00
|
|
|
buffer_put_cstring(&b, authctxt->server_user);
|
|
|
|
buffer_put_cstring(&b, authctxt->service);
|
|
|
|
buffer_put_cstring(&b, authctxt->method->name);
|
|
|
|
buffer_put_char(&b, have_sig);
|
2001-05-04 03:57:05 +00:00
|
|
|
if (!(datafellows & SSH_BUG_PKAUTH))
|
2004-01-07 11:10:17 +00:00
|
|
|
buffer_put_cstring(&b, key_ssh_name(id->key));
|
2000-05-15 04:37:24 +00:00
|
|
|
buffer_put_string(&b, blob, bloblen);
|
|
|
|
}
|
|
|
|
xfree(blob);
|
2001-05-04 03:57:05 +00:00
|
|
|
|
2000-05-15 04:37:24 +00:00
|
|
|
/* append signature */
|
|
|
|
buffer_put_string(&b, signature, slen);
|
|
|
|
xfree(signature);
|
|
|
|
|
|
|
|
/* skip session id and packet type */
|
2000-09-10 08:31:17 +00:00
|
|
|
if (buffer_len(&b) < skip + 1)
|
2000-12-05 02:20:19 +00:00
|
|
|
fatal("userauth_pubkey: internal error");
|
2000-09-10 08:31:17 +00:00
|
|
|
buffer_consume(&b, skip + 1);
|
2000-05-15 04:37:24 +00:00
|
|
|
|
|
|
|
/* put remaining data from buffer into packet */
|
|
|
|
packet_start(SSH2_MSG_USERAUTH_REQUEST);
|
|
|
|
packet_put_raw(buffer_ptr(&b), buffer_len(&b));
|
|
|
|
buffer_free(&b);
|
|
|
|
packet_send();
|
2000-09-10 08:31:17 +00:00
|
|
|
|
2000-05-15 04:37:24 +00:00
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
static int
|
2004-01-07 11:10:17 +00:00
|
|
|
send_pubkey_test(Authctxt *authctxt, Identity *id)
|
2000-12-05 02:20:19 +00:00
|
|
|
{
|
2001-05-04 03:57:05 +00:00
|
|
|
u_char *blob;
|
2002-03-18 09:55:03 +00:00
|
|
|
u_int bloblen, have_sig = 0;
|
2001-05-04 03:57:05 +00:00
|
|
|
|
|
|
|
debug3("send_pubkey_test");
|
|
|
|
|
2004-01-07 11:10:17 +00:00
|
|
|
if (key_to_blob(id->key, &blob, &bloblen) == 0) {
|
2001-05-04 03:57:05 +00:00
|
|
|
/* we cannot handle this key */
|
|
|
|
debug3("send_pubkey_test: cannot handle key");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
/* register callback for USERAUTH_PK_OK message */
|
|
|
|
dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok);
|
|
|
|
|
|
|
|
packet_start(SSH2_MSG_USERAUTH_REQUEST);
|
|
|
|
packet_put_cstring(authctxt->server_user);
|
|
|
|
packet_put_cstring(authctxt->service);
|
|
|
|
packet_put_cstring(authctxt->method->name);
|
|
|
|
packet_put_char(have_sig);
|
|
|
|
if (!(datafellows & SSH_BUG_PKAUTH))
|
2004-01-07 11:10:17 +00:00
|
|
|
packet_put_cstring(key_ssh_name(id->key));
|
2001-05-04 03:57:05 +00:00
|
|
|
packet_put_string(blob, bloblen);
|
|
|
|
xfree(blob);
|
|
|
|
packet_send();
|
|
|
|
return 1;
|
2000-12-05 02:20:19 +00:00
|
|
|
}
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
static Key *
|
2001-05-04 03:57:05 +00:00
|
|
|
load_identity_file(char *filename)
|
2000-09-10 08:31:17 +00:00
|
|
|
{
|
2001-05-04 03:57:05 +00:00
|
|
|
Key *private;
|
|
|
|
char prompt[300], *passphrase;
|
2010-03-08 11:19:52 +00:00
|
|
|
int perm_ok = 0, quit, i;
|
2000-09-10 08:31:17 +00:00
|
|
|
struct stat st;
|
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
if (stat(filename, &st) < 0) {
|
|
|
|
debug3("no such identity: %s", filename);
|
|
|
|
return NULL;
|
2000-09-10 08:31:17 +00:00
|
|
|
}
|
2006-09-30 13:29:51 +00:00
|
|
|
private = key_load_private_type(KEY_UNSPEC, filename, "", NULL, &perm_ok);
|
|
|
|
if (!perm_ok)
|
|
|
|
return NULL;
|
2001-05-04 03:57:05 +00:00
|
|
|
if (private == NULL) {
|
|
|
|
if (options.batch_mode)
|
|
|
|
return NULL;
|
2000-09-10 08:31:17 +00:00
|
|
|
snprintf(prompt, sizeof prompt,
|
2002-03-18 09:55:03 +00:00
|
|
|
"Enter passphrase for key '%.100s': ", filename);
|
2000-12-05 02:20:19 +00:00
|
|
|
for (i = 0; i < options.number_of_password_prompts; i++) {
|
|
|
|
passphrase = read_passphrase(prompt, 0);
|
|
|
|
if (strcmp(passphrase, "") != 0) {
|
2006-09-30 13:29:51 +00:00
|
|
|
private = key_load_private_type(KEY_UNSPEC,
|
|
|
|
filename, passphrase, NULL, NULL);
|
2001-05-04 03:57:05 +00:00
|
|
|
quit = 0;
|
2000-12-05 02:20:19 +00:00
|
|
|
} else {
|
|
|
|
debug2("no passphrase given, try next key");
|
2001-05-04 03:57:05 +00:00
|
|
|
quit = 1;
|
2000-12-05 02:20:19 +00:00
|
|
|
}
|
|
|
|
memset(passphrase, 0, strlen(passphrase));
|
|
|
|
xfree(passphrase);
|
2001-05-04 03:57:05 +00:00
|
|
|
if (private != NULL || quit)
|
2000-12-05 02:20:19 +00:00
|
|
|
break;
|
|
|
|
debug2("bad passphrase given, try again...");
|
|
|
|
}
|
2000-09-10 08:31:17 +00:00
|
|
|
}
|
2001-05-04 03:57:05 +00:00
|
|
|
return private;
|
|
|
|
}
|
|
|
|
|
2004-01-07 11:10:17 +00:00
|
|
|
/*
|
|
|
|
* try keys in the following order:
|
|
|
|
* 1. agent keys that are found in the config file
|
|
|
|
* 2. other agent keys
|
|
|
|
* 3. keys that are only listed in the config file
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
pubkey_prepare(Authctxt *authctxt)
|
2001-05-04 03:57:05 +00:00
|
|
|
{
|
2004-01-07 11:10:17 +00:00
|
|
|
Identity *id;
|
|
|
|
Idlist agent, files, *preferred;
|
|
|
|
Key *key;
|
|
|
|
AuthenticationConnection *ac;
|
|
|
|
char *comment;
|
|
|
|
int i, found;
|
|
|
|
|
|
|
|
TAILQ_INIT(&agent); /* keys from the agent */
|
|
|
|
TAILQ_INIT(&files); /* keys from the config file */
|
|
|
|
preferred = &authctxt->keys;
|
|
|
|
TAILQ_INIT(preferred); /* preferred order of keys */
|
|
|
|
|
|
|
|
/* list of keys stored in the filesystem */
|
|
|
|
for (i = 0; i < options.num_identity_files; i++) {
|
|
|
|
key = options.identity_keys[i];
|
|
|
|
if (key && key->type == KEY_RSA1)
|
|
|
|
continue;
|
2010-03-08 11:19:52 +00:00
|
|
|
if (key && key->cert && key->cert->type != SSH2_CERT_TYPE_USER)
|
|
|
|
continue;
|
2004-01-07 11:10:17 +00:00
|
|
|
options.identity_keys[i] = NULL;
|
2006-09-30 13:29:51 +00:00
|
|
|
id = xcalloc(1, sizeof(*id));
|
2004-01-07 11:10:17 +00:00
|
|
|
id->key = key;
|
|
|
|
id->filename = xstrdup(options.identity_files[i]);
|
|
|
|
TAILQ_INSERT_TAIL(&files, id, next);
|
|
|
|
}
|
|
|
|
/* list of keys supported by the agent */
|
|
|
|
if ((ac = ssh_get_authentication_connection())) {
|
|
|
|
for (key = ssh_get_first_identity(ac, &comment, 2);
|
|
|
|
key != NULL;
|
|
|
|
key = ssh_get_next_identity(ac, &comment, 2)) {
|
|
|
|
found = 0;
|
|
|
|
TAILQ_FOREACH(id, &files, next) {
|
2004-02-26 10:38:49 +00:00
|
|
|
/* agent keys from the config file are preferred */
|
2004-01-07 11:10:17 +00:00
|
|
|
if (key_equal(key, id->key)) {
|
|
|
|
key_free(key);
|
|
|
|
xfree(comment);
|
|
|
|
TAILQ_REMOVE(&files, id, next);
|
|
|
|
TAILQ_INSERT_TAIL(preferred, id, next);
|
|
|
|
id->ac = ac;
|
|
|
|
found = 1;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
2004-04-20 09:35:04 +00:00
|
|
|
if (!found && !options.identities_only) {
|
2006-09-30 13:29:51 +00:00
|
|
|
id = xcalloc(1, sizeof(*id));
|
2004-01-07 11:10:17 +00:00
|
|
|
id->key = key;
|
|
|
|
id->filename = comment;
|
|
|
|
id->ac = ac;
|
|
|
|
TAILQ_INSERT_TAIL(&agent, id, next);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* append remaining agent keys */
|
|
|
|
for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) {
|
|
|
|
TAILQ_REMOVE(&agent, id, next);
|
|
|
|
TAILQ_INSERT_TAIL(preferred, id, next);
|
|
|
|
}
|
|
|
|
authctxt->agent = ac;
|
|
|
|
}
|
|
|
|
/* append remaining keys from the config file */
|
|
|
|
for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) {
|
|
|
|
TAILQ_REMOVE(&files, id, next);
|
|
|
|
TAILQ_INSERT_TAIL(preferred, id, next);
|
|
|
|
}
|
|
|
|
TAILQ_FOREACH(id, preferred, next) {
|
|
|
|
debug2("key: %s (%p)", id->filename, id->key);
|
|
|
|
}
|
2001-05-04 03:57:05 +00:00
|
|
|
}
|
|
|
|
|
2004-01-07 11:10:17 +00:00
|
|
|
static void
|
|
|
|
pubkey_cleanup(Authctxt *authctxt)
|
2000-09-10 08:31:17 +00:00
|
|
|
{
|
2004-01-07 11:10:17 +00:00
|
|
|
Identity *id;
|
|
|
|
|
|
|
|
if (authctxt->agent != NULL)
|
|
|
|
ssh_close_authentication_connection(authctxt->agent);
|
|
|
|
for (id = TAILQ_FIRST(&authctxt->keys); id;
|
|
|
|
id = TAILQ_FIRST(&authctxt->keys)) {
|
|
|
|
TAILQ_REMOVE(&authctxt->keys, id, next);
|
|
|
|
if (id->key)
|
|
|
|
key_free(id->key);
|
|
|
|
if (id->filename)
|
|
|
|
xfree(id->filename);
|
|
|
|
xfree(id);
|
2000-09-10 08:31:17 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2000-12-05 02:20:19 +00:00
|
|
|
int
|
|
|
|
userauth_pubkey(Authctxt *authctxt)
|
2000-05-15 04:37:24 +00:00
|
|
|
{
|
2004-01-07 11:10:17 +00:00
|
|
|
Identity *id;
|
2000-12-05 02:20:19 +00:00
|
|
|
int sent = 0;
|
2004-01-07 11:10:17 +00:00
|
|
|
|
|
|
|
while ((id = TAILQ_FIRST(&authctxt->keys))) {
|
|
|
|
if (id->tried++)
|
|
|
|
return (0);
|
2004-02-26 10:38:49 +00:00
|
|
|
/* move key to the end of the queue */
|
2004-01-07 11:10:17 +00:00
|
|
|
TAILQ_REMOVE(&authctxt->keys, id, next);
|
|
|
|
TAILQ_INSERT_TAIL(&authctxt->keys, id, next);
|
|
|
|
/*
|
|
|
|
* send a test message if we have the public key. for
|
|
|
|
* encrypted keys we cannot do this and have to load the
|
|
|
|
* private key instead
|
|
|
|
*/
|
|
|
|
if (id->key && id->key->type != KEY_RSA1) {
|
|
|
|
debug("Offering public key: %s", id->filename);
|
|
|
|
sent = send_pubkey_test(authctxt, id);
|
|
|
|
} else if (id->key == NULL) {
|
|
|
|
debug("Trying private key: %s", id->filename);
|
|
|
|
id->key = load_identity_file(id->filename);
|
|
|
|
if (id->key != NULL) {
|
|
|
|
id->isprivate = 1;
|
|
|
|
sent = sign_and_send_pubkey(authctxt, id);
|
|
|
|
key_free(id->key);
|
|
|
|
id->key = NULL;
|
2001-05-04 03:57:05 +00:00
|
|
|
}
|
|
|
|
}
|
2004-01-07 11:10:17 +00:00
|
|
|
if (sent)
|
|
|
|
return (sent);
|
2001-05-04 03:57:05 +00:00
|
|
|
}
|
2004-01-07 11:10:17 +00:00
|
|
|
return (0);
|
2000-12-05 02:20:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Send userauth request message specifying keyboard-interactive method.
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
userauth_kbdint(Authctxt *authctxt)
|
|
|
|
{
|
|
|
|
static int attempt = 0;
|
|
|
|
|
|
|
|
if (attempt++ >= options.number_of_password_prompts)
|
|
|
|
return 0;
|
2002-03-18 09:55:03 +00:00
|
|
|
/* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */
|
|
|
|
if (attempt > 1 && !authctxt->info_req_seen) {
|
|
|
|
debug3("userauth_kbdint: disable: no info_req_seen");
|
|
|
|
dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL);
|
|
|
|
return 0;
|
|
|
|
}
|
2000-12-05 02:20:19 +00:00
|
|
|
|
|
|
|
debug2("userauth_kbdint");
|
|
|
|
packet_start(SSH2_MSG_USERAUTH_REQUEST);
|
|
|
|
packet_put_cstring(authctxt->server_user);
|
|
|
|
packet_put_cstring(authctxt->service);
|
|
|
|
packet_put_cstring(authctxt->method->name);
|
|
|
|
packet_put_cstring(""); /* lang */
|
|
|
|
packet_put_cstring(options.kbd_interactive_devices ?
|
|
|
|
options.kbd_interactive_devices : "");
|
2000-05-15 04:37:24 +00:00
|
|
|
packet_send();
|
|
|
|
|
2000-12-05 02:20:19 +00:00
|
|
|
dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2001-05-04 03:57:05 +00:00
|
|
|
* parse INFO_REQUEST, prompt user and send INFO_RESPONSE
|
2000-12-05 02:20:19 +00:00
|
|
|
*/
|
|
|
|
void
|
2002-03-18 09:55:03 +00:00
|
|
|
input_userauth_info_req(int type, u_int32_t seq, void *ctxt)
|
2000-12-05 02:20:19 +00:00
|
|
|
{
|
|
|
|
Authctxt *authctxt = ctxt;
|
2001-05-04 03:57:05 +00:00
|
|
|
char *name, *inst, *lang, *prompt, *response;
|
|
|
|
u_int num_prompts, i;
|
2000-12-05 02:20:19 +00:00
|
|
|
int echo = 0;
|
|
|
|
|
|
|
|
debug2("input_userauth_info_req");
|
|
|
|
|
|
|
|
if (authctxt == NULL)
|
|
|
|
fatal("input_userauth_info_req: no authentication context");
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
authctxt->info_req_seen = 1;
|
|
|
|
|
2000-12-05 02:20:19 +00:00
|
|
|
name = packet_get_string(NULL);
|
|
|
|
inst = packet_get_string(NULL);
|
|
|
|
lang = packet_get_string(NULL);
|
|
|
|
if (strlen(name) > 0)
|
2004-01-07 11:10:17 +00:00
|
|
|
logit("%s", name);
|
2000-12-05 02:20:19 +00:00
|
|
|
if (strlen(inst) > 0)
|
2004-01-07 11:10:17 +00:00
|
|
|
logit("%s", inst);
|
2001-05-04 03:57:05 +00:00
|
|
|
xfree(name);
|
2000-12-05 02:20:19 +00:00
|
|
|
xfree(inst);
|
2001-05-04 03:57:05 +00:00
|
|
|
xfree(lang);
|
2000-12-05 02:20:19 +00:00
|
|
|
|
|
|
|
num_prompts = packet_get_int();
|
|
|
|
/*
|
|
|
|
* Begin to build info response packet based on prompts requested.
|
|
|
|
* We commit to providing the correct number of responses, so if
|
|
|
|
* further on we run into a problem that prevents this, we have to
|
|
|
|
* be sure and clean this up and send a correct error response.
|
|
|
|
*/
|
|
|
|
packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE);
|
|
|
|
packet_put_int(num_prompts);
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
debug2("input_userauth_info_req: num_prompts %d", num_prompts);
|
2000-12-05 02:20:19 +00:00
|
|
|
for (i = 0; i < num_prompts; i++) {
|
|
|
|
prompt = packet_get_string(NULL);
|
|
|
|
echo = packet_get_char();
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
response = read_passphrase(prompt, echo ? RP_ECHO : 0);
|
2000-12-05 02:20:19 +00:00
|
|
|
|
|
|
|
packet_put_cstring(response);
|
|
|
|
memset(response, 0, strlen(response));
|
|
|
|
xfree(response);
|
|
|
|
xfree(prompt);
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_check_eom(); /* done with parsing incoming message. */
|
2000-05-15 04:37:24 +00:00
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_add_padding(64);
|
2000-05-15 04:37:24 +00:00
|
|
|
packet_send();
|
2000-12-05 02:20:19 +00:00
|
|
|
}
|
2000-05-15 04:37:24 +00:00
|
|
|
|
2002-06-23 14:01:54 +00:00
|
|
|
static int
|
2002-06-29 11:34:13 +00:00
|
|
|
ssh_keysign(Key *key, u_char **sigp, u_int *lenp,
|
2002-06-23 14:01:54 +00:00
|
|
|
u_char *data, u_int datalen)
|
|
|
|
{
|
|
|
|
Buffer b;
|
|
|
|
struct stat st;
|
|
|
|
pid_t pid;
|
|
|
|
int to[2], from[2], status, version = 2;
|
|
|
|
|
2003-04-23 16:53:02 +00:00
|
|
|
debug2("ssh_keysign called");
|
2002-06-23 14:01:54 +00:00
|
|
|
|
|
|
|
if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) {
|
2010-03-08 11:19:52 +00:00
|
|
|
error("ssh_keysign: not installed: %s", strerror(errno));
|
2002-06-23 14:01:54 +00:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
if (fflush(stdout) != 0)
|
|
|
|
error("ssh_keysign: fflush: %s", strerror(errno));
|
|
|
|
if (pipe(to) < 0) {
|
|
|
|
error("ssh_keysign: pipe: %s", strerror(errno));
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
if (pipe(from) < 0) {
|
|
|
|
error("ssh_keysign: pipe: %s", strerror(errno));
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
if ((pid = fork()) < 0) {
|
|
|
|
error("ssh_keysign: fork: %s", strerror(errno));
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
if (pid == 0) {
|
2010-03-08 11:19:52 +00:00
|
|
|
/* keep the socket on exec */
|
|
|
|
fcntl(packet_get_connection_in(), F_SETFD, 0);
|
2006-09-30 13:29:51 +00:00
|
|
|
permanently_drop_suid(getuid());
|
2002-06-23 14:01:54 +00:00
|
|
|
close(from[0]);
|
|
|
|
if (dup2(from[1], STDOUT_FILENO) < 0)
|
|
|
|
fatal("ssh_keysign: dup2: %s", strerror(errno));
|
|
|
|
close(to[1]);
|
|
|
|
if (dup2(to[0], STDIN_FILENO) < 0)
|
|
|
|
fatal("ssh_keysign: dup2: %s", strerror(errno));
|
|
|
|
close(from[1]);
|
|
|
|
close(to[0]);
|
|
|
|
execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0);
|
|
|
|
fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN,
|
|
|
|
strerror(errno));
|
|
|
|
}
|
|
|
|
close(from[1]);
|
|
|
|
close(to[0]);
|
|
|
|
|
|
|
|
buffer_init(&b);
|
|
|
|
buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */
|
|
|
|
buffer_put_string(&b, data, datalen);
|
2004-02-26 10:38:49 +00:00
|
|
|
if (ssh_msg_send(to[1], version, &b) == -1)
|
|
|
|
fatal("ssh_keysign: couldn't send request");
|
2002-06-23 14:01:54 +00:00
|
|
|
|
2002-10-29 09:43:00 +00:00
|
|
|
if (ssh_msg_recv(from[0], &b) < 0) {
|
2002-06-23 14:01:54 +00:00
|
|
|
error("ssh_keysign: no reply");
|
2004-02-26 10:38:49 +00:00
|
|
|
buffer_free(&b);
|
2002-06-23 14:01:54 +00:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
close(from[0]);
|
|
|
|
close(to[1]);
|
|
|
|
|
|
|
|
while (waitpid(pid, &status, 0) < 0)
|
|
|
|
if (errno != EINTR)
|
|
|
|
break;
|
|
|
|
|
|
|
|
if (buffer_get_char(&b) != version) {
|
|
|
|
error("ssh_keysign: bad version");
|
2004-02-26 10:38:49 +00:00
|
|
|
buffer_free(&b);
|
2002-06-23 14:01:54 +00:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
*sigp = buffer_get_string(&b, lenp);
|
2004-02-26 10:38:49 +00:00
|
|
|
buffer_free(&b);
|
2002-06-23 14:01:54 +00:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
int
|
|
|
|
userauth_hostbased(Authctxt *authctxt)
|
2000-12-05 02:20:19 +00:00
|
|
|
{
|
2001-05-04 03:57:05 +00:00
|
|
|
Key *private = NULL;
|
2002-06-23 14:01:54 +00:00
|
|
|
Sensitive *sensitive = authctxt->sensitive;
|
2001-05-04 03:57:05 +00:00
|
|
|
Buffer b;
|
|
|
|
u_char *signature, *blob;
|
2010-03-08 11:19:52 +00:00
|
|
|
char *chost, *pkalg, *p;
|
2001-05-04 03:57:05 +00:00
|
|
|
const char *service;
|
|
|
|
u_int blen, slen;
|
2010-03-08 11:19:52 +00:00
|
|
|
int ok, i, found = 0;
|
2001-05-04 03:57:05 +00:00
|
|
|
|
|
|
|
/* check for a useful key */
|
2002-06-23 14:01:54 +00:00
|
|
|
for (i = 0; i < sensitive->nkeys; i++) {
|
|
|
|
private = sensitive->keys[i];
|
2001-05-04 03:57:05 +00:00
|
|
|
if (private && private->type != KEY_RSA1) {
|
|
|
|
found = 1;
|
|
|
|
/* we take and free the key */
|
2002-06-23 14:01:54 +00:00
|
|
|
sensitive->keys[i] = NULL;
|
2001-05-04 03:57:05 +00:00
|
|
|
break;
|
|
|
|
}
|
2000-12-05 02:20:19 +00:00
|
|
|
}
|
2001-05-04 03:57:05 +00:00
|
|
|
if (!found) {
|
2003-04-23 16:53:02 +00:00
|
|
|
debug("No more client hostkeys for hostbased authentication.");
|
2001-05-04 03:57:05 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
if (key_to_blob(private, &blob, &blen) == 0) {
|
|
|
|
key_free(private);
|
|
|
|
return 0;
|
|
|
|
}
|
2002-03-18 09:55:03 +00:00
|
|
|
/* figure out a name for the client host */
|
2010-03-08 11:19:52 +00:00
|
|
|
p = get_local_name(packet_get_connection_in());
|
2002-03-18 09:55:03 +00:00
|
|
|
if (p == NULL) {
|
|
|
|
error("userauth_hostbased: cannot get local ipaddr/name");
|
|
|
|
key_free(private);
|
2006-09-30 13:29:51 +00:00
|
|
|
xfree(blob);
|
2002-03-18 09:55:03 +00:00
|
|
|
return 0;
|
|
|
|
}
|
2006-09-30 13:29:51 +00:00
|
|
|
xasprintf(&chost, "%s.", p);
|
2002-03-18 09:55:03 +00:00
|
|
|
debug2("userauth_hostbased: chost %s", chost);
|
2003-04-23 16:53:02 +00:00
|
|
|
xfree(p);
|
2002-03-18 09:55:03 +00:00
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" :
|
|
|
|
authctxt->service;
|
|
|
|
pkalg = xstrdup(key_ssh_name(private));
|
|
|
|
buffer_init(&b);
|
|
|
|
/* construct data */
|
|
|
|
buffer_put_string(&b, session_id2, session_id2_len);
|
|
|
|
buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
|
|
|
|
buffer_put_cstring(&b, authctxt->server_user);
|
|
|
|
buffer_put_cstring(&b, service);
|
|
|
|
buffer_put_cstring(&b, authctxt->method->name);
|
|
|
|
buffer_put_cstring(&b, pkalg);
|
|
|
|
buffer_put_string(&b, blob, blen);
|
|
|
|
buffer_put_cstring(&b, chost);
|
|
|
|
buffer_put_cstring(&b, authctxt->local_user);
|
|
|
|
#ifdef DEBUG_PK
|
|
|
|
buffer_dump(&b);
|
|
|
|
#endif
|
2002-06-23 14:01:54 +00:00
|
|
|
if (sensitive->external_keysign)
|
|
|
|
ok = ssh_keysign(private, &signature, &slen,
|
|
|
|
buffer_ptr(&b), buffer_len(&b));
|
|
|
|
else
|
|
|
|
ok = key_sign(private, &signature, &slen,
|
|
|
|
buffer_ptr(&b), buffer_len(&b));
|
2001-05-04 03:57:05 +00:00
|
|
|
key_free(private);
|
|
|
|
buffer_free(&b);
|
|
|
|
if (ok != 0) {
|
|
|
|
error("key_sign failed");
|
|
|
|
xfree(chost);
|
|
|
|
xfree(pkalg);
|
2006-09-30 13:29:51 +00:00
|
|
|
xfree(blob);
|
2001-05-04 03:57:05 +00:00
|
|
|
return 0;
|
2000-12-05 02:20:19 +00:00
|
|
|
}
|
2001-05-04 03:57:05 +00:00
|
|
|
packet_start(SSH2_MSG_USERAUTH_REQUEST);
|
|
|
|
packet_put_cstring(authctxt->server_user);
|
|
|
|
packet_put_cstring(authctxt->service);
|
|
|
|
packet_put_cstring(authctxt->method->name);
|
|
|
|
packet_put_cstring(pkalg);
|
|
|
|
packet_put_string(blob, blen);
|
|
|
|
packet_put_cstring(chost);
|
|
|
|
packet_put_cstring(authctxt->local_user);
|
|
|
|
packet_put_string(signature, slen);
|
|
|
|
memset(signature, 's', slen);
|
|
|
|
xfree(signature);
|
|
|
|
xfree(chost);
|
|
|
|
xfree(pkalg);
|
2006-09-30 13:29:51 +00:00
|
|
|
xfree(blob);
|
2001-05-04 03:57:05 +00:00
|
|
|
|
|
|
|
packet_send();
|
|
|
|
return 1;
|
2000-12-05 02:20:19 +00:00
|
|
|
}
|
|
|
|
|
2009-02-24 18:49:27 +00:00
|
|
|
#ifdef JPAKE
|
|
|
|
int
|
|
|
|
userauth_jpake(Authctxt *authctxt)
|
|
|
|
{
|
|
|
|
struct jpake_ctx *pctx;
|
|
|
|
u_char *x1_proof, *x2_proof;
|
|
|
|
u_int x1_proof_len, x2_proof_len;
|
|
|
|
static int attempt = 0; /* XXX share with userauth_password's? */
|
|
|
|
|
|
|
|
if (attempt++ >= options.number_of_password_prompts)
|
|
|
|
return 0;
|
|
|
|
if (attempt != 1)
|
|
|
|
error("Permission denied, please try again.");
|
|
|
|
|
|
|
|
if (authctxt->methoddata != NULL)
|
|
|
|
fatal("%s: authctxt->methoddata already set (%p)",
|
|
|
|
__func__, authctxt->methoddata);
|
|
|
|
|
|
|
|
authctxt->methoddata = pctx = jpake_new();
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Send request immediately, to get the protocol going while
|
|
|
|
* we do the initial computations.
|
|
|
|
*/
|
|
|
|
packet_start(SSH2_MSG_USERAUTH_REQUEST);
|
|
|
|
packet_put_cstring(authctxt->server_user);
|
|
|
|
packet_put_cstring(authctxt->service);
|
|
|
|
packet_put_cstring(authctxt->method->name);
|
|
|
|
packet_send();
|
|
|
|
packet_write_wait();
|
|
|
|
|
|
|
|
jpake_step1(pctx->grp,
|
|
|
|
&pctx->client_id, &pctx->client_id_len,
|
|
|
|
&pctx->x1, &pctx->x2, &pctx->g_x1, &pctx->g_x2,
|
|
|
|
&x1_proof, &x1_proof_len,
|
|
|
|
&x2_proof, &x2_proof_len);
|
|
|
|
|
|
|
|
JPAKE_DEBUG_CTX((pctx, "step 1 sending in %s", __func__));
|
|
|
|
|
|
|
|
packet_start(SSH2_MSG_USERAUTH_JPAKE_CLIENT_STEP1);
|
|
|
|
packet_put_string(pctx->client_id, pctx->client_id_len);
|
|
|
|
packet_put_bignum2(pctx->g_x1);
|
|
|
|
packet_put_bignum2(pctx->g_x2);
|
|
|
|
packet_put_string(x1_proof, x1_proof_len);
|
|
|
|
packet_put_string(x2_proof, x2_proof_len);
|
|
|
|
packet_send();
|
|
|
|
|
|
|
|
bzero(x1_proof, x1_proof_len);
|
|
|
|
bzero(x2_proof, x2_proof_len);
|
|
|
|
xfree(x1_proof);
|
|
|
|
xfree(x2_proof);
|
|
|
|
|
|
|
|
/* Expect step 1 packet from peer */
|
|
|
|
dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_STEP1,
|
|
|
|
input_userauth_jpake_server_step1);
|
2010-03-08 11:19:52 +00:00
|
|
|
dispatch_set(SSH2_MSG_USERAUTH_SUCCESS,
|
|
|
|
&input_userauth_success_unexpected);
|
2009-02-24 18:49:27 +00:00
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
userauth_jpake_cleanup(Authctxt *authctxt)
|
|
|
|
{
|
|
|
|
debug3("%s: clean up", __func__);
|
|
|
|
if (authctxt->methoddata != NULL) {
|
|
|
|
jpake_free(authctxt->methoddata);
|
|
|
|
authctxt->methoddata = NULL;
|
|
|
|
}
|
2010-03-08 11:19:52 +00:00
|
|
|
dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success);
|
2009-02-24 18:49:27 +00:00
|
|
|
}
|
|
|
|
#endif /* JPAKE */
|
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
/* find auth method */
|
|
|
|
|
2000-12-05 02:20:19 +00:00
|
|
|
/*
|
|
|
|
* given auth method name, if configurable options permit this method fill
|
|
|
|
* in auth_ident field and return true, otherwise return false.
|
|
|
|
*/
|
2002-03-18 09:55:03 +00:00
|
|
|
static int
|
2000-12-05 02:20:19 +00:00
|
|
|
authmethod_is_enabled(Authmethod *method)
|
|
|
|
{
|
|
|
|
if (method == NULL)
|
|
|
|
return 0;
|
|
|
|
/* return false if options indicate this method is disabled */
|
|
|
|
if (method->enabled == NULL || *method->enabled == 0)
|
|
|
|
return 0;
|
|
|
|
/* return false if batch mode is enabled but method needs interactive mode */
|
|
|
|
if (method->batch_flag != NULL && *method->batch_flag != 0)
|
|
|
|
return 0;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
static Authmethod *
|
2000-12-05 02:20:19 +00:00
|
|
|
authmethod_lookup(const char *name)
|
|
|
|
{
|
|
|
|
Authmethod *method = NULL;
|
|
|
|
if (name != NULL)
|
|
|
|
for (method = authmethods; method->name != NULL; method++)
|
|
|
|
if (strcmp(name, method->name) == 0)
|
|
|
|
return method;
|
|
|
|
debug2("Unrecognized authentication method name: %s", name ? name : "NULL");
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
/* XXX internal state */
|
|
|
|
static Authmethod *current = NULL;
|
|
|
|
static char *supported = NULL;
|
|
|
|
static char *preferred = NULL;
|
2002-06-29 11:34:13 +00:00
|
|
|
|
2000-12-05 02:20:19 +00:00
|
|
|
/*
|
|
|
|
* Given the authentication method list sent by the server, return the
|
|
|
|
* next method we should try. If the server initially sends a nil list,
|
2001-05-04 03:57:05 +00:00
|
|
|
* use a built-in default list.
|
|
|
|
*/
|
2002-03-18 09:55:03 +00:00
|
|
|
static Authmethod *
|
2000-12-05 02:20:19 +00:00
|
|
|
authmethod_get(char *authlist)
|
|
|
|
{
|
2001-05-04 03:57:05 +00:00
|
|
|
char *name = NULL;
|
2002-03-18 09:55:03 +00:00
|
|
|
u_int next;
|
2001-05-04 03:57:05 +00:00
|
|
|
|
2000-12-05 02:20:19 +00:00
|
|
|
/* Use a suitable default if we're passed a nil list. */
|
|
|
|
if (authlist == NULL || strlen(authlist) == 0)
|
2001-05-04 03:57:05 +00:00
|
|
|
authlist = options.preferred_authentications;
|
|
|
|
|
|
|
|
if (supported == NULL || strcmp(authlist, supported) != 0) {
|
|
|
|
debug3("start over, passed a different list %s", authlist);
|
|
|
|
if (supported != NULL)
|
|
|
|
xfree(supported);
|
|
|
|
supported = xstrdup(authlist);
|
|
|
|
preferred = options.preferred_authentications;
|
|
|
|
debug3("preferred %s", preferred);
|
|
|
|
current = NULL;
|
|
|
|
} else if (current != NULL && authmethod_is_enabled(current))
|
|
|
|
return current;
|
2000-12-05 02:20:19 +00:00
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
for (;;) {
|
|
|
|
if ((name = match_list(preferred, supported, &next)) == NULL) {
|
2003-04-23 16:53:02 +00:00
|
|
|
debug("No more authentication methods to try.");
|
2001-05-04 03:57:05 +00:00
|
|
|
current = NULL;
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
preferred += next;
|
2000-12-05 02:20:19 +00:00
|
|
|
debug3("authmethod_lookup %s", name);
|
2001-05-04 03:57:05 +00:00
|
|
|
debug3("remaining preferred: %s", preferred);
|
|
|
|
if ((current = authmethod_lookup(name)) != NULL &&
|
|
|
|
authmethod_is_enabled(current)) {
|
2000-12-05 02:20:19 +00:00
|
|
|
debug3("authmethod_is_enabled %s", name);
|
2003-04-23 16:53:02 +00:00
|
|
|
debug("Next authentication method: %s", name);
|
2001-05-04 03:57:05 +00:00
|
|
|
return current;
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
2000-12-05 02:20:19 +00:00
|
|
|
}
|
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 *
|
2001-05-04 03:57:05 +00:00
|
|
|
authmethods_get(void)
|
|
|
|
{
|
|
|
|
Authmethod *method = NULL;
|
2002-03-18 09:55:03 +00:00
|
|
|
Buffer b;
|
|
|
|
char *list;
|
2001-05-04 03:57:05 +00:00
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
buffer_init(&b);
|
2001-05-04 03:57:05 +00:00
|
|
|
for (method = authmethods; method->name != NULL; method++) {
|
|
|
|
if (authmethod_is_enabled(method)) {
|
2002-03-18 09:55:03 +00:00
|
|
|
if (buffer_len(&b) > 0)
|
|
|
|
buffer_append(&b, ",", 1);
|
|
|
|
buffer_append(&b, method->name, strlen(method->name));
|
2001-05-04 03:57:05 +00:00
|
|
|
}
|
|
|
|
}
|
2002-03-18 09:55:03 +00:00
|
|
|
buffer_append(&b, "\0", 1);
|
|
|
|
list = xstrdup(buffer_ptr(&b));
|
|
|
|
buffer_free(&b);
|
|
|
|
return list;
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
2009-02-24 18:49:27 +00:00
|
|
|
|