Mercurial > dropbear

annotate cli-kex.c @ 1549:5212630893ab

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
only clean libtom when using bundled libraries
author Matt Johnston <matt@ucc.asn.au>
date Mon, 26 Feb 2018 23:13:54 +0800
parents 06d52bcb8094
children d32bcb5c557d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
1 /*
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
2 * Dropbear - a SSH2 server
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
3 *
74
e3adf4cf5465 License boilerplate etc, add Mihnea as an author to some of the files
Matt Johnston <matt@ucc.asn.au>
parents: 59
diff changeset
4 * Copyright (c) 2002-2004 Matt Johnston
e3adf4cf5465 License boilerplate etc, add Mihnea as an author to some of the files
Matt Johnston <matt@ucc.asn.au>
parents: 59
diff changeset
5 * Copyright (c) 2004 by Mihnea Stoenescu
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
6 * All rights reserved.
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
7 *
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
9 * of this software and associated documentation files (the "Software"), to deal
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
10 * in the Software without restriction, including without limitation the rights
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
12 * copies of the Software, and to permit persons to whom the Software is
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
13 * furnished to do so, subject to the following conditions:
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
14 *
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
15 * The above copyright notice and this permission notice shall be included in
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
16 * all copies or substantial portions of the Software.
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
17 *
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
24 * SOFTWARE. */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
25
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
26 #include "includes.h"
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
27 #include "session.h"
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
28 #include "dbutil.h"
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
29 #include "algo.h"
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
30 #include "buffer.h"
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
31 #include "session.h"
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
32 #include "kex.h"
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
33 #include "ssh.h"
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
34 #include "packet.h"
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
35 #include "bignum.h"
858
220f55d540ae rename random.h to dbrandom.h since some OSes have a system random.h
Matt Johnston <matt@ucc.asn.au>
parents: 850
diff changeset
36 #include "dbrandom.h"
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
37 #include "runopts.h"
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 26
diff changeset
38 #include "signkey.h"
761
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 759
diff changeset
39 #include "ecc.h"
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
40
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
41
1459
06d52bcb8094 Pointer parameter could be declared as pointing to const
Francois Perrad <francois.perrad@gadz.org>
parents: 1295
diff changeset
42 static void checkhostkey(const unsigned char* keyblob, unsigned int keybloblen);
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
43 #define MAX_KNOWNHOSTS_LINE 4500
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
44
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
45 void send_msg_kexdh_init() {
739
d44325108d0e first_kex_packet_follows working, needs tidying
Matt Johnston <matt@ucc.asn.au>
parents: 723
diff changeset
46 TRACE(("send_msg_kexdh_init()"))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
47
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
48 CHECKCLEARTOWRITE();
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
49 buf_putbyte(ses.writepayload, SSH_MSG_KEXDH_INIT);
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
50 switch (ses.newkeys->algo_kex->mode) {
1294
56aba7dedbea options for disabling "normal" DH
Matt Johnston <matt@ucc.asn.au>
parents: 1257
diff changeset
51 #if DROPBEAR_NORMAL_DH
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
52 case DROPBEAR_KEX_NORMAL_DH:
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
53 if (ses.newkeys->algo_kex != cli_ses.param_kex_algo
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
54 || !cli_ses.dh_param) {
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
55 if (cli_ses.dh_param) {
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
56 free_kexdh_param(cli_ses.dh_param);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
57 }
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
58 cli_ses.dh_param = gen_kexdh_param();
801
7dcb46da72d9 merge in HEAD
Matt Johnston <matt@ucc.asn.au>
parents: 765 775
diff changeset
59 }
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
60 buf_putmpint(ses.writepayload, &cli_ses.dh_param->pub);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
61 break;
1294
56aba7dedbea options for disabling "normal" DH
Matt Johnston <matt@ucc.asn.au>
parents: 1257
diff changeset
62 #endif
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1294
diff changeset
63 #if DROPBEAR_ECDH
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
64 case DROPBEAR_KEX_ECDH:
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
65 if (ses.newkeys->algo_kex != cli_ses.param_kex_algo
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
66 || !cli_ses.ecdh_param) {
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
67 if (cli_ses.ecdh_param) {
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
68 free_kexecdh_param(cli_ses.ecdh_param);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
69 }
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
70 cli_ses.ecdh_param = gen_kexecdh_param();
801
7dcb46da72d9 merge in HEAD
Matt Johnston <matt@ucc.asn.au>
parents: 765 775
diff changeset
71 }
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
72 buf_put_ecc_raw_pubkey_string(ses.writepayload, &cli_ses.ecdh_param->key);
1294
56aba7dedbea options for disabling "normal" DH
Matt Johnston <matt@ucc.asn.au>
parents: 1257
diff changeset
73 break;
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 723
diff changeset
74 #endif
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1294
diff changeset
75 #if DROPBEAR_CURVE25519
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
76 case DROPBEAR_KEX_CURVE25519:
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
77 if (ses.newkeys->algo_kex != cli_ses.param_kex_algo
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
78 || !cli_ses.curve25519_param) {
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
79 if (cli_ses.curve25519_param) {
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
80 free_kexcurve25519_param(cli_ses.curve25519_param);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
81 }
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
82 cli_ses.curve25519_param = gen_kexcurve25519_param();
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
83 }
1122
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
Matt Johnston <matt@ucc.asn.au>
parents: 1094
diff changeset
84 buf_putstring(ses.writepayload, (const char*)cli_ses.curve25519_param->pub, CURVE25519_LEN);
1294
56aba7dedbea options for disabling "normal" DH
Matt Johnston <matt@ucc.asn.au>
parents: 1257
diff changeset
85 break;
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
86 #endif
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 723
diff changeset
87 }
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
88
801
7dcb46da72d9 merge in HEAD
Matt Johnston <matt@ucc.asn.au>
parents: 765 775
diff changeset
89 cli_ses.param_kex_algo = ses.newkeys->algo_kex;
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 encrypt_packet();
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 /* Handle a diffie-hellman key exchange reply. */
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 void recv_msg_kexdh_reply() {
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 sign_key *hostkey = NULL;
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
97 unsigned int type, keybloblen;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
98 unsigned char* keyblob = NULL;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
99
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 106
diff changeset
100 TRACE(("enter recv_msg_kexdh_reply"))
84
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 80
diff changeset
101
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 80
diff changeset
102 if (cli_ses.kex_state != KEXDH_INIT_SENT) {
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 80
diff changeset
103 dropbear_exit("Received out-of-order kexdhreply");
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 80
diff changeset
104 }
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
105 type = ses.newkeys->algo_hostkey;
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 106
diff changeset
106 TRACE(("type is %d", type))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
107
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
108 hostkey = new_sign_key();
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
109 keybloblen = buf_getint(ses.payload);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
110
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
111 keyblob = buf_getptr(ses.payload, keybloblen);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
112 if (!ses.kexstate.donefirstkex) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
113 /* Only makes sense the first time */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
114 checkhostkey(keyblob, keybloblen);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
115 }
34
e2a1eaa19f22 Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents: 33
diff changeset
116
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
117 if (buf_get_pub_key(ses.payload, hostkey, &type) != DROPBEAR_SUCCESS) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 106
diff changeset
118 TRACE(("failed getting pubkey"))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
119 dropbear_exit("Bad KEX packet");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
120 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
121
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
122 switch (ses.newkeys->algo_kex->mode) {
1294
56aba7dedbea options for disabling "normal" DH
Matt Johnston <matt@ucc.asn.au>
parents: 1257
diff changeset
123 #if DROPBEAR_NORMAL_DH
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
124 case DROPBEAR_KEX_NORMAL_DH:
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
125 {
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
126 DEF_MP_INT(dh_f);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
127 m_mp_init(&dh_f);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
128 if (buf_getmpint(ses.payload, &dh_f) != DROPBEAR_SUCCESS) {
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
129 TRACE(("failed getting mpint"))
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
130 dropbear_exit("Bad KEX packet");
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
131 }
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
132
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
133 kexdh_comb_key(cli_ses.dh_param, &dh_f, hostkey);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
134 mp_clear(&dh_f);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
135 }
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
136 break;
1294
56aba7dedbea options for disabling "normal" DH
Matt Johnston <matt@ucc.asn.au>
parents: 1257
diff changeset
137 #endif
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1294
diff changeset
138 #if DROPBEAR_ECDH
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
139 case DROPBEAR_KEX_ECDH:
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
140 {
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
141 buffer *ecdh_qs = buf_getstringbuf(ses.payload);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
142 kexecdh_comb_key(cli_ses.ecdh_param, ecdh_qs, hostkey);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
143 buf_free(ecdh_qs);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
144 }
1294
56aba7dedbea options for disabling "normal" DH
Matt Johnston <matt@ucc.asn.au>
parents: 1257
diff changeset
145 break;
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents: 723
diff changeset
146 #endif
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1294
diff changeset
147 #if DROPBEAR_CURVE25519
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
148 case DROPBEAR_KEX_CURVE25519:
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
149 {
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
150 buffer *ecdh_qs = buf_getstringbuf(ses.payload);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
151 kexcurve25519_comb_key(cli_ses.curve25519_param, ecdh_qs, hostkey);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
152 buf_free(ecdh_qs);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
153 }
1294
56aba7dedbea options for disabling "normal" DH
Matt Johnston <matt@ucc.asn.au>
parents: 1257
diff changeset
154 break;
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
155 #endif
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
156 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
157
801
7dcb46da72d9 merge in HEAD
Matt Johnston <matt@ucc.asn.au>
parents: 765 775
diff changeset
158 if (cli_ses.dh_param) {
7dcb46da72d9 merge in HEAD
Matt Johnston <matt@ucc.asn.au>
parents: 765 775
diff changeset
159 free_kexdh_param(cli_ses.dh_param);
7dcb46da72d9 merge in HEAD
Matt Johnston <matt@ucc.asn.au>
parents: 765 775
diff changeset
160 cli_ses.dh_param = NULL;
7dcb46da72d9 merge in HEAD
Matt Johnston <matt@ucc.asn.au>
parents: 765 775
diff changeset
161 }
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1294
diff changeset
162 #if DROPBEAR_ECDH
801
7dcb46da72d9 merge in HEAD
Matt Johnston <matt@ucc.asn.au>
parents: 765 775
diff changeset
163 if (cli_ses.ecdh_param) {
7dcb46da72d9 merge in HEAD
Matt Johnston <matt@ucc.asn.au>
parents: 765 775
diff changeset
164 free_kexecdh_param(cli_ses.ecdh_param);
7dcb46da72d9 merge in HEAD
Matt Johnston <matt@ucc.asn.au>
parents: 765 775
diff changeset
165 cli_ses.ecdh_param = NULL;
7dcb46da72d9 merge in HEAD
Matt Johnston <matt@ucc.asn.au>
parents: 765 775
diff changeset
166 }
7dcb46da72d9 merge in HEAD
Matt Johnston <matt@ucc.asn.au>
parents: 765 775
diff changeset
167 #endif
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1294
diff changeset
168 #if DROPBEAR_CURVE25519
848
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
169 if (cli_ses.curve25519_param) {
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
170 free_kexcurve25519_param(cli_ses.curve25519_param);
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
171 cli_ses.curve25519_param = NULL;
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
172 }
6c69e7df3621 curve25519
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
173 #endif
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
174
801
7dcb46da72d9 merge in HEAD
Matt Johnston <matt@ucc.asn.au>
parents: 765 775
diff changeset
175 cli_ses.param_kex_algo = NULL;
7dcb46da72d9 merge in HEAD
Matt Johnston <matt@ucc.asn.au>
parents: 765 775
diff changeset
176 if (buf_verify(ses.payload, hostkey, ses.hash) != DROPBEAR_SUCCESS) {
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
177 dropbear_exit("Bad hostkey signature");
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
178 }
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
179
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
180 sign_key_free(hostkey);
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
181 hostkey = NULL;
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
182
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
183 send_msg_newkeys();
886
cbc73a5aefb0 requirenext doesn't need two values
Matt Johnston <matt@ucc.asn.au>
parents: 885
diff changeset
184 ses.requirenext = SSH_MSG_NEWKEYS;
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 106
diff changeset
185 TRACE(("leave recv_msg_kexdh_init"))
26
0969767bca0d snapshot of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
186 }
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
187
1459
06d52bcb8094 Pointer parameter could be declared as pointing to const
Francois Perrad <francois.perrad@gadz.org>
parents: 1295
diff changeset
188 static void ask_to_confirm(const unsigned char* keyblob, unsigned int keybloblen,
847
f4bb964c8678 Add '-R' for delayed hostkey option
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
189 const char* algoname) {
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
190
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
191 char* fp = NULL;
170
a62cb364f615 Read "y/n" response for fingerprints from /dev/tty directly so that dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
192 FILE *tty = NULL;
1257
8291fc87273e Fix truncated type for getc() at confirmation prompt
Matt Johnston <matt@ucc.asn.au>
parents: 1213
diff changeset
193 int response = 'z';
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
194
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
195 fp = sign_key_fingerprint(keyblob, keybloblen);
418
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
196 if (cli_opts.always_accept_key) {
1213
7fd1211a1f63 Use dropbear_log instead of some fprintf's in client code.
Konstantin Tokarev <ktokarev@smartlabs.tv>
parents: 1124
diff changeset
197 dropbear_log(LOG_INFO, "\nHost '%s' key accepted unconditionally.\n(%s fingerprint %s)\n",
418
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
198 cli_opts.remotehost,
847
f4bb964c8678 Add '-R' for delayed hostkey option
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
199 algoname,
418
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
200 fp);
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
201 m_free(fp);
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
202 return;
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
203 }
847
f4bb964c8678 Add '-R' for delayed hostkey option
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
204 fprintf(stderr, "\nHost '%s' is not in the trusted hosts file.\n(%s fingerprint %s)\nDo you want to continue connecting? (y/n) ",
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
205 cli_opts.remotehost,
847
f4bb964c8678 Add '-R' for delayed hostkey option
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
206 algoname,
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
207 fp);
340
454a34b2dfd1 Fixes from Erik Hovland:
Matt Johnston <matt@ucc.asn.au>
parents: 322
diff changeset
208 m_free(fp);
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
209
170
a62cb364f615 Read "y/n" response for fingerprints from /dev/tty directly so that dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
210 tty = fopen(_PATH_TTY, "r");
a62cb364f615 Read "y/n" response for fingerprints from /dev/tty directly so that dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
211 if (tty) {
a62cb364f615 Read "y/n" response for fingerprints from /dev/tty directly so that dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
212 response = getc(tty);
a62cb364f615 Read "y/n" response for fingerprints from /dev/tty directly so that dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
213 fclose(tty);
a62cb364f615 Read "y/n" response for fingerprints from /dev/tty directly so that dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
214 } else {
a62cb364f615 Read "y/n" response for fingerprints from /dev/tty directly so that dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
215 response = getc(stdin);
a62cb364f615 Read "y/n" response for fingerprints from /dev/tty directly so that dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
216 }
a62cb364f615 Read "y/n" response for fingerprints from /dev/tty directly so that dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
217
a62cb364f615 Read "y/n" response for fingerprints from /dev/tty directly so that dbclient
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
218 if (response == 'y') {
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
219 return;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
220 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
221
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
222 dropbear_exit("Didn't validate host key");
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
223 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
224
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
225 static FILE* open_known_hosts_file(int * readonly)
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
226 {
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
227 FILE * hostsfile = NULL;
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
228 char * filename = NULL;
318
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
229 char * homedir = NULL;
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
230
322
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
231 homedir = getenv("HOME");
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
232
322
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
233 if (!homedir) {
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
234 struct passwd * pw = NULL;
322
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
235 pw = getpwuid(getuid());
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
236 if (pw) {
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
237 homedir = pw->pw_dir;
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
238 }
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
239 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
240
318
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
241 if (homedir) {
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
242 unsigned int len;
318
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
243 len = strlen(homedir);
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
244 filename = m_malloc(len + 18); /* "/.ssh/known_hosts" and null-terminator*/
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
245
318
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
246 snprintf(filename, len+18, "%s/.ssh", homedir);
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
247 /* Check that ~/.ssh exists - easiest way is just to mkdir */
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
248 if (mkdir(filename, S_IRWXU) != 0) {
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
249 if (errno != EEXIST) {
322
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
250 dropbear_log(LOG_INFO, "Warning: failed creating %s/.ssh: %s",
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
251 homedir, strerror(errno));
318
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
252 TRACE(("mkdir didn't work: %s", strerror(errno)))
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
253 goto out;
318
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
254 }
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
255 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
256
318
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
257 snprintf(filename, len+18, "%s/.ssh/known_hosts", homedir);
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
258 hostsfile = fopen(filename, "a+");
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
259
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
260 if (hostsfile != NULL) {
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
261 *readonly = 0;
318
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
262 fseek(hostsfile, 0, SEEK_SET);
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
263 } else {
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
264 /* We mightn't have been able to open it if it was read-only */
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
265 if (errno == EACCES || errno == EROFS) {
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
266 TRACE(("trying readonly: %s", strerror(errno)))
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
267 *readonly = 1;
318
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
268 hostsfile = fopen(filename, "r");
9916350d7d8b don't fail fatally if the client can't get homedir from getpwuid(), fallback
Matt Johnston <matt@ucc.asn.au>
parents: 170
diff changeset
269 }
106
e13f8a712a1c Fix if the first write fails
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
270 }
59
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
271 }
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
272
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
273 if (hostsfile == NULL) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 106
diff changeset
274 TRACE(("hostsfile didn't open: %s", strerror(errno)))
322
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
275 dropbear_log(LOG_WARNING, "Failed to open %s/.ssh/known_hosts",
84aa4e60bd3c Look at HOME before /etc/passwd when looking for ~/.ssh/known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 318
diff changeset
276 homedir);
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
277 goto out;
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
278 }
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
279
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
280 out:
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
281 m_free(filename);
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
282 return hostsfile;
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
283 }
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
284
1459
06d52bcb8094 Pointer parameter could be declared as pointing to const
Francois Perrad <francois.perrad@gadz.org>
parents: 1295
diff changeset
285 static void checkhostkey(const unsigned char* keyblob, unsigned int keybloblen) {
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
286
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
287 FILE *hostsfile = NULL;
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
288 int readonly = 0;
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
289 unsigned int hostlen, algolen;
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
290 unsigned long len;
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
291 const char *algoname = NULL;
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
292 char * fingerprint = NULL;
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
293 buffer * line = NULL;
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
294 int ret;
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
295
772
7fc0aeada79c -y -y to disable hostkey checking
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
296 if (cli_opts.no_hostkey_check) {
1213
7fd1211a1f63 Use dropbear_log instead of some fprintf's in client code.
Konstantin Tokarev <ktokarev@smartlabs.tv>
parents: 1124
diff changeset
297 dropbear_log(LOG_INFO, "Caution, skipping hostkey check for %s\n", cli_opts.remotehost);
772
7fc0aeada79c -y -y to disable hostkey checking
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
298 return;
7fc0aeada79c -y -y to disable hostkey checking
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
299 }
7fc0aeada79c -y -y to disable hostkey checking
Matt Johnston <matt@ucc.asn.au>
parents: 568
diff changeset
300
847
f4bb964c8678 Add '-R' for delayed hostkey option
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
301 algoname = signkey_name_from_type(ses.newkeys->algo_hostkey, &algolen);
f4bb964c8678 Add '-R' for delayed hostkey option
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
302
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
303 hostsfile = open_known_hosts_file(&readonly);
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
304 if (!hostsfile) {
847
f4bb964c8678 Add '-R' for delayed hostkey option
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
305 ask_to_confirm(keyblob, keybloblen, algoname);
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
306 /* ask_to_confirm will exit upon failure */
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
307 return;
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
308 }
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
309
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
310 line = buf_new(MAX_KNOWNHOSTS_LINE);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
311 hostlen = strlen(cli_opts.remotehost);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
312
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
313 do {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
314 if (buf_getline(line, hostsfile) == DROPBEAR_FAILURE) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 106
diff changeset
315 TRACE(("failed reading line: prob EOF"))
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
316 break;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
317 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
318
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
319 /* The line is too short to be sensible */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
320 /* "30" is 'enough to hold ssh-dss plus the spaces, ie so we don't
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
321 * buf_getfoo() past the end and die horribly - the base64 parsing
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
322 * code is what tiptoes up to the end nicely */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
323 if (line->len < (hostlen+30) ) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 106
diff changeset
324 TRACE(("line is too short to be sensible"))
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
325 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
326 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
327
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
328 /* Compare hostnames */
1094
c45d65392c1a Fix pointer differ in signess warnings [-Werror=pointer-sign]
Gaël PORTAY <gael.portay@gmail.com>
parents: 886
diff changeset
329 if (strncmp(cli_opts.remotehost, (const char *) buf_getptr(line, hostlen),
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
330 hostlen) != 0) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
331 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
332 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
333
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
334 buf_incrpos(line, hostlen);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
335 if (buf_getbyte(line) != ' ') {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
336 /* there wasn't a space after the hostname, something dodgy */
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 106
diff changeset
337 TRACE(("missing space afte matching hostname"))
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
338 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
339 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
340
1094
c45d65392c1a Fix pointer differ in signess warnings [-Werror=pointer-sign]
Gaël PORTAY <gael.portay@gmail.com>
parents: 886
diff changeset
341 if (strncmp((const char *) buf_getptr(line, algolen), algoname, algolen) != 0) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 106
diff changeset
342 TRACE(("algo doesn't match"))
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
343 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
344 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
345
59
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
346 buf_incrpos(line, algolen);
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
347 if (buf_getbyte(line) != ' ') {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 106
diff changeset
348 TRACE(("missing space after algo"))
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
349 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
350 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
351
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
352 /* Now we're at the interesting hostkey */
1094
c45d65392c1a Fix pointer differ in signess warnings [-Werror=pointer-sign]
Gaël PORTAY <gael.portay@gmail.com>
parents: 886
diff changeset
353 ret = cmp_base64_key(keyblob, keybloblen, (const unsigned char *) algoname, algolen,
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
354 line, &fingerprint);
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
355
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
356 if (ret == DROPBEAR_SUCCESS) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
357 /* Good matching key */
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 106
diff changeset
358 TRACE(("good matching key"))
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
359 goto out;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
360 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
361
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
362 /* The keys didn't match. eep. Note that we're "leaking"
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
363 the fingerprint strings here, but we're exiting anyway */
847
f4bb964c8678 Add '-R' for delayed hostkey option
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
364 dropbear_exit("\n\n%s host key mismatch for %s !\n"
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
365 "Fingerprint is %s\n"
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
366 "Expected %s\n"
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
367 "If you know that the host key is correct you can\nremove the bad entry from ~/.ssh/known_hosts",
847
f4bb964c8678 Add '-R' for delayed hostkey option
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
368 algoname,
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
369 cli_opts.remotehost,
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
370 sign_key_fingerprint(keyblob, keybloblen),
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 418
diff changeset
371 fingerprint ? fingerprint : "UNKNOWN");
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
372 } while (1); /* keep going 'til something happens */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
373
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
374 /* Key doesn't exist yet */
847
f4bb964c8678 Add '-R' for delayed hostkey option
Matt Johnston <matt@ucc.asn.au>
parents: 801
diff changeset
375 ask_to_confirm(keyblob, keybloblen, algoname);
59
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
376
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
377 /* If we get here, they said yes */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
378
59
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
379 if (readonly) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 106
diff changeset
380 TRACE(("readonly"))
59
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
381 goto out;
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
382 }
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
383
418
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
384 if (!cli_opts.always_accept_key) {
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
385 /* put the new entry in the file */
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
386 fseek(hostsfile, 0, SEEK_END); /* In case it wasn't opened append */
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
387 buf_setpos(line, 0);
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
388 buf_setlen(line, 0);
1094
c45d65392c1a Fix pointer differ in signess warnings [-Werror=pointer-sign]
Gaël PORTAY <gael.portay@gmail.com>
parents: 886
diff changeset
389 buf_putbytes(line, (const unsigned char *) cli_opts.remotehost, hostlen);
418
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
390 buf_putbyte(line, ' ');
1094
c45d65392c1a Fix pointer differ in signess warnings [-Werror=pointer-sign]
Gaël PORTAY <gael.portay@gmail.com>
parents: 886
diff changeset
391 buf_putbytes(line, (const unsigned char *) algoname, algolen);
418
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
392 buf_putbyte(line, ' ');
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
393 len = line->size - line->pos;
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
394 /* The only failure with base64 is buffer_overflow, but buf_getwriteptr
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
395 * will die horribly in the case anyway */
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
396 base64_encode(keyblob, keybloblen, buf_getwriteptr(line, len), &len);
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
397 buf_incrwritepos(line, len);
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
398 buf_putbyte(line, '\n');
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
399 buf_setpos(line, 0);
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
400 fwrite(buf_getptr(line, line->len), line->len, 1, hostsfile);
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
401 /* We ignore errors, since there's not much we can do about them */
ab57ba0cb667 Add '-y' option to dbclient to accept the host key without checking
Matt Johnston <matt@ucc.asn.au>
parents: 340
diff changeset
402 }
59
bdc97a5719f4 add new entries to known_hosts
Matt Johnston <matt@ucc.asn.au>
parents: 51
diff changeset
403
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
404 out:
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
405 if (hostsfile != NULL) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
406 fclose(hostsfile);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
407 }
79
5a55bd66707f - don't crash when trying to add to known_hosts if it doesn't exist
Matt Johnston <matt@ucc.asn.au>
parents: 74
diff changeset
408 if (line != NULL) {
5a55bd66707f - don't crash when trying to add to known_hosts if it doesn't exist
Matt Johnston <matt@ucc.asn.au>
parents: 74
diff changeset
409 buf_free(line);
5a55bd66707f - don't crash when trying to add to known_hosts if it doesn't exist
Matt Johnston <matt@ucc.asn.au>
parents: 74
diff changeset
410 }
544
9e51707cd6f2 - Make -i and -W pass through multihop arguments
Matt Johnston <matt@ucc.asn.au>
parents: 440
diff changeset
411 m_free(fingerprint);
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
412 }