dropbear: svr-kex.c annotate

annotate svr-kex.c @ 973:3fbb9a72fb75

Merge pull request #5 from rcleere/ssh_client Add SSH_CLIENT environment variable

author	Matt Johnston <matt@ucc.asn.au>
date	Tue, 21 Oct 2014 21:43:20 +0800
parents	cbc73a5aefb0
children	fd2e8bbb0333

rev	line source
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1 /*
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	2 * Dropbear - a SSH2 server
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	3 *
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	4 * Copyright (c) 2002,2003 Matt Johnston
74 e3adf4cf5465 License boilerplate etc, add Mihnea as an author to some of the files Matt Johnston <matt@ucc.asn.au> parents: 26 diff changeset	5 * Copyright (c) 2004 by Mihnea Stoenescu
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	6 * All rights reserved.
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	7 *
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	8 * Permission is hereby granted, free of charge, to any person obtaining a copy
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	9 * of this software and associated documentation files (the "Software"), to deal
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	10 * in the Software without restriction, including without limitation the rights
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	12 * copies of the Software, and to permit persons to whom the Software is
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	13 * furnished to do so, subject to the following conditions:
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	14 *
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	15 * The above copyright notice and this permission notice shall be included in
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	16 * all copies or substantial portions of the Software.
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	17 *
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
fe6bca95afa7 Makefile.in contains updated files required 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
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	24 * SOFTWARE. */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	25
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	26 #include "includes.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	27 #include "dbutil.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	28 #include "algo.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	29 #include "buffer.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	30 #include "session.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	31 #include "kex.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	32 #include "ssh.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	33 #include "packet.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	34 #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: 852 diff changeset	35 #include "dbrandom.h"
24 469950e86d0f switching to global vars Matt Johnston <matt@ucc.asn.au> parents: 22 diff changeset	36 #include "runopts.h"
761 ac2158e3e403 ecc kind of works, needs fixing/testing Matt Johnston <matt@ucc.asn.au> parents: 759 diff changeset	37 #include "ecc.h"
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	38 #include "gensignkey.h"
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	39
755 b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: 603 diff changeset	40 static void send_msg_kexdh_reply(mp_int dh_e, buffer ecdh_qs);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	41
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	42 /* Handle a diffie-hellman key exchange initialisation. This involves
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	43 * calculating a session key reply value, and corresponding hash. These
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	44 * are carried out by send_msg_kexdh_reply(). recv_msg_kexdh_init() calls
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	45 * that function, then brings the new keys into use */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	46 void recv_msg_kexdh_init() {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	47
84 29a5c7c62350 default initialisers for mp_ints Matt Johnston <matt@ucc.asn.au> parents: 74 diff changeset	48 DEF_MP_INT(dh_e);
755 b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: 603 diff changeset	49 buffer *ecdh_qs = NULL;
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	50
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 84 diff changeset	51 TRACE(("enter recv_msg_kexdh_init"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	52 if (!ses.kexstate.recvkexinit) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	53 dropbear_exit("Premature kexdh_init message received");
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	54 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	55
848 6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	56 switch (ses.newkeys->algo_kex->mode) {
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	57 case DROPBEAR_KEX_NORMAL_DH:
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	58 m_mp_init(&dh_e);
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	59 if (buf_getmpint(ses.payload, &dh_e) != DROPBEAR_SUCCESS) {
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	60 dropbear_exit("Bad kex value");
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	61 }
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	62 break;
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	63 case DROPBEAR_KEX_ECDH:
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	64 case DROPBEAR_KEX_CURVE25519:
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	65 #if defined(DROPBEAR_ECDH) \|\| defined(DROPBEAR_CURVE25519)
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	66 ecdh_qs = buf_getstringbuf(ses.payload);
755 b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: 603 diff changeset	67 #endif
848 6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	68 break;
340 454a34b2dfd1 Fixes from Erik Hovland: Matt Johnston <matt@ucc.asn.au> parents: 165 diff changeset	69 }
852 7540c0822374 Various cleanups and fixes for warnings Matt Johnston <matt@ucc.asn.au> parents: 850 diff changeset	70 if (ses.payload->pos != ses.payload->len) {
7540c0822374 Various cleanups and fixes for warnings Matt Johnston <matt@ucc.asn.au> parents: 850 diff changeset	71 dropbear_exit("Bad kex value");
7540c0822374 Various cleanups and fixes for warnings Matt Johnston <matt@ucc.asn.au> parents: 850 diff changeset	72 }
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	73
755 b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: 603 diff changeset	74 send_msg_kexdh_reply(&dh_e, ecdh_qs);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	75
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	76 mp_clear(&dh_e);
755 b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: 603 diff changeset	77 if (ecdh_qs) {
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: 603 diff changeset	78 buf_free(ecdh_qs);
852 7540c0822374 Various cleanups and fixes for warnings Matt Johnston <matt@ucc.asn.au> parents: 850 diff changeset	79 ecdh_qs = NULL;
755 b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: 603 diff changeset	80 }
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	81
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	82 send_msg_newkeys();
886 cbc73a5aefb0 requirenext doesn't need two values Matt Johnston <matt@ucc.asn.au> parents: 875 diff changeset	83 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: 84 diff changeset	84 TRACE(("leave recv_msg_kexdh_init"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	85 }
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	86
847 f4bb964c8678 Add '-R' for delayed hostkey option Matt Johnston <matt@ucc.asn.au> parents: 846 diff changeset	87 #ifdef DROPBEAR_DELAY_HOSTKEY
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	88 static void svr_ensure_hostkey() {
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	89
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	90 const char* fn = NULL;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	91 char *fn_temp = NULL;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	92 enum signkey_type type = ses.newkeys->algo_hostkey;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	93 void **hostkey = signkey_key_ptr(svr_opts.hostkey, type);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	94 int ret = DROPBEAR_FAILURE;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	95
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	96 if (hostkey && *hostkey) {
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	97 return;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	98 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	99
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	100 switch (type)
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	101 {
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	102 #ifdef DROPBEAR_RSA
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	103 case DROPBEAR_SIGNKEY_RSA:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	104 fn = RSA_PRIV_FILENAME;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	105 break;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	106 #endif
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	107 #ifdef DROPBEAR_DSS
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	108 case DROPBEAR_SIGNKEY_DSS:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	109 fn = DSS_PRIV_FILENAME;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	110 break;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	111 #endif
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	112 #ifdef DROPBEAR_ECDSA
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	113 case DROPBEAR_SIGNKEY_ECDSA_NISTP256:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	114 case DROPBEAR_SIGNKEY_ECDSA_NISTP384:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	115 case DROPBEAR_SIGNKEY_ECDSA_NISTP521:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	116 fn = ECDSA_PRIV_FILENAME;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	117 break;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	118 #endif
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	119 default:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	120 (void)0;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	121 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	122
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	123 if (readhostkey(fn, svr_opts.hostkey, &type) == DROPBEAR_SUCCESS) {
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	124 return;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	125 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	126
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	127 fn_temp = m_malloc(strlen(fn) + 20);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	128 snprintf(fn_temp, strlen(fn)+20, "%s.tmp%d", fn, getpid());
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	129
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	130 if (signkey_generate(type, 0, fn_temp) == DROPBEAR_FAILURE) {
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	131 goto out;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	132 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	133
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	134 if (link(fn_temp, fn) < 0) {
852 7540c0822374 Various cleanups and fixes for warnings Matt Johnston <matt@ucc.asn.au> parents: 850 diff changeset	135 /* It's OK to get EEXIST - we probably just lost a race
7540c0822374 Various cleanups and fixes for warnings Matt Johnston <matt@ucc.asn.au> parents: 850 diff changeset	136 with another connection to generate the key */
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	137 if (errno != EEXIST) {
852 7540c0822374 Various cleanups and fixes for warnings Matt Johnston <matt@ucc.asn.au> parents: 850 diff changeset	138 dropbear_log(LOG_ERR, "Failed moving key file to %s: %s", fn,
7540c0822374 Various cleanups and fixes for warnings Matt Johnston <matt@ucc.asn.au> parents: 850 diff changeset	139 strerror(errno));
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	140 /* XXX fallback to non-atomic copy for some filesystems? */
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	141 goto out;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	142 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	143 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	144
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	145 ret = readhostkey(fn, svr_opts.hostkey, &type);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	146
875 6c7a15668d5a Log when generating a hostkey Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	147 if (ret == DROPBEAR_SUCCESS) {
6c7a15668d5a Log when generating a hostkey Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	148 char *fp = NULL;
6c7a15668d5a Log when generating a hostkey Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	149 unsigned int len;
6c7a15668d5a Log when generating a hostkey Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	150 buffer *key_buf = buf_new(MAX_PUBKEY_SIZE);
6c7a15668d5a Log when generating a hostkey Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	151 buf_put_pub_key(key_buf, svr_opts.hostkey, type);
6c7a15668d5a Log when generating a hostkey Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	152 buf_setpos(key_buf, 4);
6c7a15668d5a Log when generating a hostkey Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	153 len = key_buf->len - key_buf->pos;
6c7a15668d5a Log when generating a hostkey Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	154 fp = sign_key_fingerprint(buf_getptr(key_buf, len), len);
6c7a15668d5a Log when generating a hostkey Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	155 dropbear_log(LOG_INFO, "Generated hostkey %s, fingerprint is %s",
6c7a15668d5a Log when generating a hostkey Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	156 fn, fp);
6c7a15668d5a Log when generating a hostkey Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	157 m_free(fp);
6c7a15668d5a Log when generating a hostkey Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	158 buf_free(key_buf);
6c7a15668d5a Log when generating a hostkey Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	159 }
6c7a15668d5a Log when generating a hostkey Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	160
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	161 out:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	162 if (fn_temp) {
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	163 unlink(fn_temp);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	164 m_free(fn_temp);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	165 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	166
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	167 if (ret == DROPBEAR_FAILURE)
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	168 {
847 f4bb964c8678 Add '-R' for delayed hostkey option Matt Johnston <matt@ucc.asn.au> parents: 846 diff changeset	169 dropbear_exit("Couldn't read or generate hostkey %s", fn);
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	170 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	171 }
847 f4bb964c8678 Add '-R' for delayed hostkey option Matt Johnston <matt@ucc.asn.au> parents: 846 diff changeset	172 #endif
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	173
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	174 /* Generate our side of the diffie-hellman key exchange value (dh_f), and
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	175 * calculate the session key using the diffie-hellman algorithm. Following
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	176 * that, the session hash is calculated, and signed with RSA or DSS. The
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	177 * result is sent to the client.
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	178 *
755 b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: 603 diff changeset	179 * See the transport RFC4253 section 8 for details
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: 603 diff changeset	180 * or RFC5656 section 4 for elliptic curve variant. */
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: 603 diff changeset	181 static void send_msg_kexdh_reply(mp_int dh_e, buffer ecdh_qs) {
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 84 diff changeset	182 TRACE(("enter send_msg_kexdh_reply"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	183
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	184 /* we can start creating the kexdh_reply packet */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	185 CHECKCLEARTOWRITE();
847 f4bb964c8678 Add '-R' for delayed hostkey option Matt Johnston <matt@ucc.asn.au> parents: 846 diff changeset	186
f4bb964c8678 Add '-R' for delayed hostkey option Matt Johnston <matt@ucc.asn.au> parents: 846 diff changeset	187 #ifdef DROPBEAR_DELAY_HOSTKEY
f4bb964c8678 Add '-R' for delayed hostkey option Matt Johnston <matt@ucc.asn.au> parents: 846 diff changeset	188 if (svr_opts.delay_hostkey)
f4bb964c8678 Add '-R' for delayed hostkey option Matt Johnston <matt@ucc.asn.au> parents: 846 diff changeset	189 {
f4bb964c8678 Add '-R' for delayed hostkey option Matt Johnston <matt@ucc.asn.au> parents: 846 diff changeset	190 svr_ensure_hostkey();
f4bb964c8678 Add '-R' for delayed hostkey option Matt Johnston <matt@ucc.asn.au> parents: 846 diff changeset	191 }
f4bb964c8678 Add '-R' for delayed hostkey option Matt Johnston <matt@ucc.asn.au> parents: 846 diff changeset	192 #endif
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	193
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	194 buf_putbyte(ses.writepayload, SSH_MSG_KEXDH_REPLY);
24 469950e86d0f switching to global vars Matt Johnston <matt@ucc.asn.au> parents: 22 diff changeset	195 buf_put_pub_key(ses.writepayload, svr_opts.hostkey,
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	196 ses.newkeys->algo_hostkey);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	197
848 6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	198 switch (ses.newkeys->algo_kex->mode) {
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	199 case DROPBEAR_KEX_NORMAL_DH:
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	200 {
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	201 struct kex_dh_param * dh_param = gen_kexdh_param();
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	202 kexdh_comb_key(dh_param, dh_e, svr_opts.hostkey);
755 b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: 603 diff changeset	203
848 6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	204 /* put f */
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	205 buf_putmpint(ses.writepayload, &dh_param->pub);
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	206 free_kexdh_param(dh_param);
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	207 }
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	208 break;
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	209 case DROPBEAR_KEX_ECDH:
755 b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: 603 diff changeset	210 #ifdef DROPBEAR_ECDH
848 6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	211 {
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	212 struct kex_ecdh_param *ecdh_param = gen_kexecdh_param();
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	213 kexecdh_comb_key(ecdh_param, ecdh_qs, svr_opts.hostkey);
755 b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: 603 diff changeset	214
848 6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	215 buf_put_ecc_raw_pubkey_string(ses.writepayload, &ecdh_param->key);
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	216 free_kexecdh_param(ecdh_param);
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	217 }
755 b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: 603 diff changeset	218 #endif
848 6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	219 break;
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	220 case DROPBEAR_KEX_CURVE25519:
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	221 #ifdef DROPBEAR_CURVE25519
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	222 {
849 754d7bee1068 Merge Matt Johnston <matt@ucc.asn.au> parents: 848 847 diff changeset	223 struct kex_curve25519_param *param = gen_kexcurve25519_param();
848 6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	224 kexcurve25519_comb_key(param, ecdh_qs, svr_opts.hostkey);
850 7507b174bba0 - Make curve25519 work after fixing a typo, interoperates with OpenSSH Matt Johnston <matt@ucc.asn.au> parents: 849 diff changeset	225 buf_putstring(ses.writepayload, param->pub, CURVE25519_LEN);
848 6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	226 free_kexcurve25519_param(param);
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	227 }
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	228 #endif
6c69e7df3621 curve25519 Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	229 break;
755 b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: 603 diff changeset	230 }
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	231
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	232 /* calc the signature */
24 469950e86d0f switching to global vars Matt Johnston <matt@ucc.asn.au> parents: 22 diff changeset	233 buf_put_sign(ses.writepayload, svr_opts.hostkey,
761 ac2158e3e403 ecc kind of works, needs fixing/testing Matt Johnston <matt@ucc.asn.au> parents: 759 diff changeset	234 ses.newkeys->algo_hostkey, ses.hash);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	235
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	236 /* the SSH_MSG_KEXDH_REPLY is done */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	237 encrypt_packet();
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	238
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 84 diff changeset	239 TRACE(("leave send_msg_kexdh_reply"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	240 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	241

Mercurial > dropbear

annotate svr-kex.c @ 973:3fbb9a72fb75