dropbear: cli-kex.c annotate

annotate cli-kex.c @ 74:e3adf4cf5465

License boilerplate etc, add Mihnea as an author to some of the files

author	Matt Johnston <matt@ucc.asn.au>
date	Sat, 14 Aug 2004 17:54:20 +0000
parents	bdc97a5719f4
children	5a55bd66707f

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"
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	36 #include "random.h"
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"
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	39
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	40
51 095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	41 static void checkhostkey(unsigned char* keyblob, unsigned int keybloblen);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	42 #define MAX_KNOWNHOSTS_LINE 4500
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	43
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	44 void send_msg_kexdh_init() {
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	45
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	46 cli_ses.dh_e = (mp_int*)m_malloc(sizeof(mp_int));
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	47 cli_ses.dh_x = (mp_int*)m_malloc(sizeof(mp_int));
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	48
34 e2a1eaa19f22 Client mostly works up to password auth Matt Johnston <matt@ucc.asn.au> parents: 33 diff changeset	49 m_mp_init_multi(cli_ses.dh_e, cli_ses.dh_x, NULL);
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	50 gen_kexdh_vals(cli_ses.dh_e, cli_ses.dh_x);
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	51
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	52 CHECKCLEARTOWRITE();
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	53 buf_putbyte(ses.writepayload, SSH_MSG_KEXDH_INIT);
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	54 buf_putmpint(ses.writepayload, cli_ses.dh_e);
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	55 encrypt_packet();
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	56 ses.requirenext = SSH_MSG_KEXDH_REPLY;
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	57 }
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	58
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	59 /* Handle a diffie-hellman key exchange reply. */
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	60 void recv_msg_kexdh_reply() {
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	61
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	62 mp_int dh_f;
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	63 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	64 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	65 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	66
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	67
34 e2a1eaa19f22 Client mostly works up to password auth Matt Johnston <matt@ucc.asn.au> parents: 33 diff changeset	68 TRACE(("enter recv_msg_kexdh_reply"));
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	69 type = ses.newkeys->algo_hostkey;
34 e2a1eaa19f22 Client mostly works up to password auth Matt Johnston <matt@ucc.asn.au> parents: 33 diff changeset	70 TRACE(("type is %d", type));
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	71
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	72 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	73 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	74
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	75 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	76 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	77 /* 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	78 checkhostkey(keyblob, keybloblen);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	79 }
34 e2a1eaa19f22 Client mostly works up to password auth Matt Johnston <matt@ucc.asn.au> parents: 33 diff changeset	80
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	81 if (buf_get_pub_key(ses.payload, hostkey, &type) != DROPBEAR_SUCCESS) {
34 e2a1eaa19f22 Client mostly works up to password auth Matt Johnston <matt@ucc.asn.au> parents: 33 diff changeset	82 TRACE(("failed getting pubkey"));
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	83 dropbear_exit("Bad KEX packet");
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	84 }
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	85
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	86 m_mp_init(&dh_f);
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	87 if (buf_getmpint(ses.payload, &dh_f) != DROPBEAR_SUCCESS) {
34 e2a1eaa19f22 Client mostly works up to password auth Matt Johnston <matt@ucc.asn.au> parents: 33 diff changeset	88 TRACE(("failed getting mpint"));
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	89 dropbear_exit("Bad KEX packet");
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	90 }
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 kexdh_comb_key(cli_ses.dh_e, cli_ses.dh_x, &dh_f, hostkey);
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	93 mp_clear(&dh_f);
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	94
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	95 if (buf_verify(ses.payload, hostkey, ses.hash, SHA1_HASH_SIZE)
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	96 != DROPBEAR_SUCCESS) {
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	97 dropbear_exit("Bad hostkey signature");
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	98 }
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	99
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	100 sign_key_free(hostkey);
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	101 hostkey = NULL;
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	102
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	103 send_msg_newkeys();
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	104 ses.requirenext = SSH_MSG_NEWKEYS;
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	105 TRACE(("leave recv_msg_kexdh_init"));
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	106 }
51 095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	107
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	108 static void ask_to_confirm(unsigned char* keyblob, unsigned int keybloblen) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	109
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	110 char* fp = NULL;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	111
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	112 fp = sign_key_fingerprint(keyblob, keybloblen);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	113 fprintf(stderr, "\nHost '%s' is not in the trusted hosts file.\n(fingerprint %s)\nDo you want to continue connecting? (y/n)\n",
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	114 cli_opts.remotehost,
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	115 fp);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	116
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	117 if (getc(stdin) == 'y') {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	118 m_free(fp);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	119 return;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	120 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	121
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	122 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	123 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	124
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	125 static void checkhostkey(unsigned char* keyblob, unsigned int keybloblen) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	126
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	127 char * filename = NULL;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	128 FILE *hostsfile = NULL;
59 bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	129 int readonly = 0;
51 095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	130 struct passwd *pw = NULL;
59 bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	131 unsigned int hostlen, algolen;
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	132 unsigned long len;
51 095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	133 const char *algoname = NULL;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	134 buffer * line = NULL;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	135 int ret;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	136
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	137 pw = getpwuid(getuid());
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	138
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	139 if (pw == NULL) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	140 dropbear_exit("Failed to get homedir");
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	141 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	142
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	143 len = strlen(pw->pw_dir);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	144 filename = m_malloc(len + 18); /* "/.ssh/known_hosts" and null-terminator*/
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	145
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	146 snprintf(filename, len+18, "%s/.ssh", pw->pw_dir);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	147 /* Check that ~/.ssh exists - easiest way is just to mkdir */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	148 if (mkdir(filename, S_IRWXU) != 0) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	149 if (errno != EEXIST) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	150 ask_to_confirm(keyblob, keybloblen);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	151 goto out; /* only get here on success */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	152 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	153 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	154
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	155 snprintf(filename, len+18, "%s/.ssh/known_hosts", pw->pw_dir);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	156 hostsfile = fopen(filename, "r+");
59 bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	157
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	158 /* We mightn't have been able to open it if it was read-only */
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	159 if (hostsfile == NULL && (errno == EACCES \|\| errno == EROFS)) {
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	160 readonly = 1;
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	161 hostsfile = fopen(filename, "r");
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	162 }
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	163
51 095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	164 if (hostsfile == NULL) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	165 ask_to_confirm(keyblob, keybloblen);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	166 goto out; /* We only get here on success */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	167 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	168
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	169 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	170 hostlen = strlen(cli_opts.remotehost);
59 bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	171 algoname = signkey_name_from_type(ses.newkeys->algo_hostkey, &algolen);
51 095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	172
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	173 do {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	174 if (buf_getline(line, hostsfile) == DROPBEAR_FAILURE) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	175 TRACE(("failed reading line: prob EOF"));
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	176 break;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	177 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	178
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	179 /* 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	180 /* "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	181 * 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	182 * 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	183 if (line->len < (hostlen+30) ) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	184 TRACE(("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	185 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	186 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	187
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	188 /* Compare hostnames */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	189 if (strncmp(cli_opts.remotehost, buf_getptr(line, hostlen),
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	190 hostlen) != 0) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	191 TRACE(("hosts don't match"));
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	192 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	193 }
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 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	196 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	197 /* there wasn't a space after the hostname, something dodgy */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	198 TRACE(("missing space afte matching hostname"));
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	199 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	200 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	201
59 bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	202 if ( strncmp(buf_getptr(line, algolen), algoname, algolen) != 0) {
51 095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	203 TRACE(("algo doesn't match"));
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	204 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	205 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	206
59 bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	207 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	208 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	209 TRACE(("missing space after algo"));
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	210 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	211 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	212
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	213 /* Now we're at the interesting hostkey */
59 bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	214 ret = cmp_base64_key(keyblob, keybloblen, algoname, algolen, line);
51 095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	215
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	216 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	217 /* Good matching key */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	218 TRACE(("good matching key"));
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	219 goto out;
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 /* The keys didn't match. eep. */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	223 } 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	224
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	225 /* Key doesn't exist yet */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	226 ask_to_confirm(keyblob, keybloblen);
59 bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	227
51 095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	228 /* 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	229
59 bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	230 if (readonly) {
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	231 goto out;
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	232 }
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	233
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	234 /* put the new entry in the file */
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	235 fseek(hostsfile, 0, SEEK_END);
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	236 buf_setpos(line, 0);
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	237 buf_setlen(line, 0);
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	238 buf_putbytes(line, ses.remotehost, hostlen);
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	239 buf_putbyte(line, ' ');
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	240 buf_putbytes(line, algoname, algolen);
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	241 buf_putbyte(line, ' ');
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	242 len = line->size - line->pos;
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	243 TRACE(("keybloblen %d, len %d", keybloblen, len));
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	244 /* The only failure with base64 is buffer_overflow, but buf_getwriteptr
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	245 * will die horribly in the case anyway */
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	246 base64_encode(keyblob, keybloblen, buf_getwriteptr(line, len), &len);
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	247 buf_incrwritepos(line, len);
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	248 buf_putbyte(line, '\n');
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	249 buf_setpos(line, 0);
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	250 fwrite(buf_getptr(line, line->len), line->len, 1, hostsfile);
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	251 /* We ignore errors, since there's not much we can do about them */
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	252
51 095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	253 out:
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	254 if (hostsfile != NULL) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	255 fclose(hostsfile);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	256 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	257 m_free(filename);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	258 buf_free(line);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	259 }

Mercurial > dropbear

annotate cli-kex.c @ 74:e3adf4cf5465