dropbear: cli-kex.c annotate

annotate cli-kex.c @ 128:a9dddd13c4ba

Added dropbear.8 and dropbearkey.8 back in

author	Matt Johnston <matt@ucc.asn.au>
date	Tue, 14 Sep 2004 15:26:50 +0000
parents	e13f8a712a1c
children	0cfba3034be5

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));
84 29a5c7c62350 default initialisers for mp_ints Matt Johnston <matt@ucc.asn.au> parents: 80 diff changeset	48 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	49
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
84 29a5c7c62350 default initialisers for mp_ints Matt Johnston <matt@ucc.asn.au> parents: 80 diff changeset	62 DEF_MP_INT(dh_f);
26 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"));
84 29a5c7c62350 default initialisers for mp_ints Matt Johnston <matt@ucc.asn.au> parents: 80 diff changeset	69
29a5c7c62350 default initialisers for mp_ints Matt Johnston <matt@ucc.asn.au> parents: 80 diff changeset	70 if (cli_ses.kex_state != KEXDH_INIT_SENT) {
29a5c7c62350 default initialisers for mp_ints Matt Johnston <matt@ucc.asn.au> parents: 80 diff changeset	71 dropbear_exit("Received out-of-order kexdhreply");
29a5c7c62350 default initialisers for mp_ints Matt Johnston <matt@ucc.asn.au> parents: 80 diff changeset	72 }
29a5c7c62350 default initialisers for mp_ints Matt Johnston <matt@ucc.asn.au> parents: 80 diff changeset	73 m_mp_init(&dh_f);
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	74 type = ses.newkeys->algo_hostkey;
34 e2a1eaa19f22 Client mostly works up to password auth Matt Johnston <matt@ucc.asn.au> parents: 33 diff changeset	75 TRACE(("type is %d", type));
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	76
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	77 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	78 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	79
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	80 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	81 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	82 /* 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	83 checkhostkey(keyblob, keybloblen);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	84 }
34 e2a1eaa19f22 Client mostly works up to password auth Matt Johnston <matt@ucc.asn.au> parents: 33 diff changeset	85
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	86 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	87 TRACE(("failed getting pubkey"));
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	88 dropbear_exit("Bad KEX packet");
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	89 }
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 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	92 TRACE(("failed getting mpint"));
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	93 dropbear_exit("Bad KEX packet");
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
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	96 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	97 mp_clear(&dh_f);
84 29a5c7c62350 default initialisers for mp_ints Matt Johnston <matt@ucc.asn.au> parents: 80 diff changeset	98 mp_clear_multi(cli_ses.dh_e, cli_ses.dh_x, NULL);
29a5c7c62350 default initialisers for mp_ints Matt Johnston <matt@ucc.asn.au> parents: 80 diff changeset	99 m_free(cli_ses.dh_e);
29a5c7c62350 default initialisers for mp_ints Matt Johnston <matt@ucc.asn.au> parents: 80 diff changeset	100 m_free(cli_ses.dh_x);
26 0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	101
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	102 if (buf_verify(ses.payload, hostkey, ses.hash, SHA1_HASH_SIZE)
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	103 != DROPBEAR_SUCCESS) {
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	104 dropbear_exit("Bad hostkey signature");
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	105 }
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	106
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	107 sign_key_free(hostkey);
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	108 hostkey = NULL;
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	109
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	110 send_msg_newkeys();
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	111 ses.requirenext = SSH_MSG_NEWKEYS;
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	112 TRACE(("leave recv_msg_kexdh_init"));
0969767bca0d snapshot of stuff Matt Johnston <matt@ucc.asn.au> parents: diff changeset	113 }
51 095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	114
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	115 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	116
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	117 char* fp = NULL;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	118
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	119 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	120 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	121 cli_opts.remotehost,
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	122 fp);
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 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	125 m_free(fp);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	126 return;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	127 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	128
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	129 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	130 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	131
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	132 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	133
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	134 char * filename = NULL;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	135 FILE *hostsfile = NULL;
59 bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	136 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	137 struct passwd *pw = NULL;
59 bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	138 unsigned int hostlen, algolen;
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	139 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	140 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	141 buffer * line = NULL;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	142 int ret;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	143
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	144 pw = getpwuid(getuid());
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 if (pw == NULL) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	147 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	148 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	149
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	150 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	151 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	152
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	153 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	154 /* 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	155 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	156 if (errno != EEXIST) {
80 07bcdccb3577 create known_hosts properly Matt Johnston <matt@ucc.asn.au> parents: 79 diff changeset	157 dropbear_log(LOG_INFO, "Warning: failed creating ~/.ssh: %s",
07bcdccb3577 create known_hosts properly Matt Johnston <matt@ucc.asn.au> parents: 79 diff changeset	158 strerror(errno));
07bcdccb3577 create known_hosts properly Matt Johnston <matt@ucc.asn.au> parents: 79 diff changeset	159 TRACE(("mkdir didn't work: %s", strerror(errno)));
51 095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	160 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	161 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	162 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	163 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	164
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	165 snprintf(filename, len+18, "%s/.ssh/known_hosts", pw->pw_dir);
80 07bcdccb3577 create known_hosts properly Matt Johnston <matt@ucc.asn.au> parents: 79 diff changeset	166 hostsfile = fopen(filename, "a+");
59 bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	167
106 e13f8a712a1c Fix if the first write fails Matt Johnston <matt@ucc.asn.au> parents: 84 diff changeset	168 if (hostsfile != NULL) {
e13f8a712a1c Fix if the first write fails Matt Johnston <matt@ucc.asn.au> parents: 84 diff changeset	169 fseek(hostsfile, 0, SEEK_SET);
e13f8a712a1c Fix if the first write fails Matt Johnston <matt@ucc.asn.au> parents: 84 diff changeset	170 } else {
e13f8a712a1c Fix if the first write fails Matt Johnston <matt@ucc.asn.au> parents: 84 diff changeset	171 /* We mightn't have been able to open it if it was read-only */
e13f8a712a1c Fix if the first write fails Matt Johnston <matt@ucc.asn.au> parents: 84 diff changeset	172 if (errno == EACCES \|\| errno == EROFS) {
e13f8a712a1c Fix if the first write fails Matt Johnston <matt@ucc.asn.au> parents: 84 diff changeset	173 TRACE(("trying readonly: %s", strerror(errno)));
e13f8a712a1c Fix if the first write fails Matt Johnston <matt@ucc.asn.au> parents: 84 diff changeset	174 readonly = 1;
e13f8a712a1c Fix if the first write fails Matt Johnston <matt@ucc.asn.au> parents: 84 diff changeset	175 hostsfile = fopen(filename, "r");
e13f8a712a1c Fix if the first write fails Matt Johnston <matt@ucc.asn.au> parents: 84 diff changeset	176 }
59 bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	177 }
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	178
51 095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	179 if (hostsfile == NULL) {
80 07bcdccb3577 create known_hosts properly Matt Johnston <matt@ucc.asn.au> parents: 79 diff changeset	180 TRACE(("hostsfile didn't open: %s", strerror(errno)));
51 095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	181 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	182 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	183 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	184
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	185 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	186 hostlen = strlen(cli_opts.remotehost);
59 bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	187 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	188
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	189 do {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	190 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	191 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	192 break;
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 /* 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	196 /* "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	197 * 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	198 * 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	199 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	200 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	201 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	202 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	203
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	204 /* Compare hostnames */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	205 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	206 hostlen) != 0) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	207 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	208 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	209 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	210
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	211 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	212 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	213 /* 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	214 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	215 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	216 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	217
59 bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	218 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	219 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	220 continue;
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
59 bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	223 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	224 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	225 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	226 continue;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	227 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	228
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	229 /* 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	230 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	231
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	232 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	233 /* Good matching key */
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	234 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	235 goto out;
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	236 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	237
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	238 /* 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	239 } 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	240
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	241 /* 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	242 ask_to_confirm(keyblob, keybloblen);
59 bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	243
51 095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	244 /* 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	245
59 bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	246 if (readonly) {
80 07bcdccb3577 create known_hosts properly Matt Johnston <matt@ucc.asn.au> parents: 79 diff changeset	247 TRACE(("readonly"));
59 bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	248 goto out;
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	249 }
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	250
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	251 /* put the new entry in the file */
80 07bcdccb3577 create known_hosts properly Matt Johnston <matt@ucc.asn.au> parents: 79 diff changeset	252 fseek(hostsfile, 0, SEEK_END); /* In case it wasn't opened append */
59 bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	253 buf_setpos(line, 0);
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	254 buf_setlen(line, 0);
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	255 buf_putbytes(line, ses.remotehost, hostlen);
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	256 buf_putbyte(line, ' ');
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	257 buf_putbytes(line, algoname, algolen);
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	258 buf_putbyte(line, ' ');
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	259 len = line->size - line->pos;
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	260 TRACE(("keybloblen %d, len %d", keybloblen, len));
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	261 /* 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	262 * will die horribly in the case anyway */
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	263 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	264 buf_incrwritepos(line, len);
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	265 buf_putbyte(line, '\n');
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	266 buf_setpos(line, 0);
bdc97a5719f4 add new entries to known_hosts Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	267 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	268 /* 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	269
51 095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	270 out:
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	271 if (hostsfile != NULL) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	272 fclose(hostsfile);
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	273 }
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	274 m_free(filename);
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	275 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	276 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	277 }
51 095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 34 diff changeset	278 }

Mercurial > dropbear

annotate cli-kex.c @ 128:a9dddd13c4ba