dropbear: svr-authpubkey.c annotate

annotate svr-authpubkey.c @ 1060:4c733310c21d nocircbuffer

reword comment for clarity

author	Matt Johnston <matt@ucc.asn.au>
date	Sun, 01 Mar 2015 23:26:42 +0800
parents	703c7cdd2577
children	c45d65392c1a

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
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	5 * All rights reserved.
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	6 *
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	7 * 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	8 * 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	9 * 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	10 * 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	11 * 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	12 * 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	13 *
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	14 * 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	15 * all copies or substantial portions of the Software.
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	16 *
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	17 * 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	18 * 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	19 * 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	20 * 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	21 * 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	22 * 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	23 * SOFTWARE. */
475 52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	24 /*
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	25 * This file incorporates work covered by the following copyright and
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	26 * permission notice:
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	27 *
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	28 * Copyright (c) 2000 Markus Friedl. All rights reserved.
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	29 *
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	30 * Redistribution and use in source and binary forms, with or without
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	31 * modification, are permitted provided that the following conditions
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	32 * are met:
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	33 * 1. Redistributions of source code must retain the above copyright
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	34 * notice, this list of conditions and the following disclaimer.
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	35 * 2. Redistributions in binary form must reproduce the above copyright
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	36 * notice, this list of conditions and the following disclaimer in the
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	37 * documentation and/or other materials provided with the distribution.
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	38 *
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	39 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	40 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	41 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	42 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	43 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	45 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	46 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	47 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	48 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	49 *
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	50 * This copyright and permission notice applies to the code parsing public keys
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	51 * options string which can also be found in OpenSSH auth2-pubkey.c file
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	52 * (user_key_allowed2). It has been adapted to work with buffers.
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	53 *
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	54 */
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	55
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	56 /* Process a pubkey auth request */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	57
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	58 #include "includes.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	59 #include "session.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	60 #include "dbutil.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	61 #include "buffer.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	62 #include "signkey.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	63 #include "auth.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	64 #include "ssh.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	65 #include "packet.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	66 #include "algo.h"
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	67
68 eee77ac31ccc cleaning up the pubkey defines Matt Johnston <matt@ucc.asn.au> parents: 51 diff changeset	68 #ifdef ENABLE_SVR_PUBKEY_AUTH
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	69
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	70 #define MIN_AUTHKEYS_LINE 10 /* "ssh-rsa AB" - short but doesn't matter */
51 095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 44 diff changeset	71 #define MAX_AUTHKEYS_LINE 4200 /* max length of a line in authkeys */
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	72
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	73 static int checkpubkey(unsigned char* algo, unsigned int algolen,
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	74 unsigned char* keyblob, unsigned int keybloblen);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	75 static int checkpubkeyperms();
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	76 static void send_msg_userauth_pk_ok(unsigned char* algo, unsigned int algolen,
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	77 unsigned char* keyblob, unsigned int keybloblen);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	78 static int checkfileperm(char * filename);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	79
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	80 /* process a pubkey auth request, sending success or failure message as
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	81 * appropriate */
33 f789045062e6 Progressing client support Matt Johnston <matt@ucc.asn.au> parents: 4 diff changeset	82 void svr_auth_pubkey() {
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	83
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	84 unsigned char testkey; /* whether we're just checking if a key is usable */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	85 unsigned char* algo = NULL; /* pubkey algo */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	86 unsigned int algolen;
70 b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree Matt Johnston <matt@ucc.asn.au> parents: 68 diff changeset	87 unsigned char* keyblob = NULL;
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	88 unsigned int keybloblen;
1059 703c7cdd2577 Fix pubkey auth after change to reuse ses.readbuf as ses.payload Matt Johnston <matt@ucc.asn.au> parents: 853 diff changeset	89 unsigned int sign_payload_length;
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	90 buffer * signbuf = NULL;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	91 sign_key * key = NULL;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	92 char* fp = NULL;
852 7540c0822374 Various cleanups and fixes for warnings Matt Johnston <matt@ucc.asn.au> parents: 762 diff changeset	93 enum signkey_type type = -1;
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	94
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 158 diff changeset	95 TRACE(("enter pubkeyauth"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	96
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	97 /* 0 indicates user just wants to check if key can be used, 1 is an
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	98 * actual attempt*/
179 161557a9dde8 * fix longstanding bug with connections being closed on failure to Matt Johnston <matt@ucc.asn.au> parents: 165 diff changeset	99 testkey = (buf_getbool(ses.payload) == 0);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	100
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	101 algo = buf_getstring(ses.payload, &algolen);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	102 keybloblen = buf_getint(ses.payload);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	103 keyblob = buf_getptr(ses.payload, keybloblen);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	104
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	105 /* check if the key is valid */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	106 if (checkpubkey(algo, algolen, keyblob, keybloblen) == DROPBEAR_FAILURE) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	107 send_msg_userauth_failure(0, 0);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	108 goto out;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	109 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	110
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	111 /* let them know that the key is ok to use */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	112 if (testkey) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	113 send_msg_userauth_pk_ok(algo, algolen, keyblob, keybloblen);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	114 goto out;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	115 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	116
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	117 /* now we can actually verify the signature */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	118
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	119 /* get the key */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	120 key = new_sign_key();
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	121 type = DROPBEAR_SIGNKEY_ANY;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	122 if (buf_get_pub_key(ses.payload, key, &type) == DROPBEAR_FAILURE) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	123 send_msg_userauth_failure(0, 1);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	124 goto out;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	125 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	126
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	127 /* create the data which has been signed - this a string containing
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	128 * session_id, concatenated with the payload packet up to the signature */
1059 703c7cdd2577 Fix pubkey auth after change to reuse ses.readbuf as ses.payload Matt Johnston <matt@ucc.asn.au> parents: 853 diff changeset	129 assert(ses.payload_beginning <= ses.payload->pos);
703c7cdd2577 Fix pubkey auth after change to reuse ses.readbuf as ses.payload Matt Johnston <matt@ucc.asn.au> parents: 853 diff changeset	130 sign_payload_length = ses.payload->pos - ses.payload_beginning;
762 a78a38e402d1 - Fix various hardcoded uses of SHA1 Matt Johnston <matt@ucc.asn.au> parents: 761 diff changeset	131 signbuf = buf_new(ses.payload->pos + 4 + ses.session_id->len);
761 ac2158e3e403 ecc kind of works, needs fixing/testing Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	132 buf_putbufstring(signbuf, ses.session_id);
1059 703c7cdd2577 Fix pubkey auth after change to reuse ses.readbuf as ses.payload Matt Johnston <matt@ucc.asn.au> parents: 853 diff changeset	133
703c7cdd2577 Fix pubkey auth after change to reuse ses.readbuf as ses.payload Matt Johnston <matt@ucc.asn.au> parents: 853 diff changeset	134 /* The entire contents of the payload prior. */
703c7cdd2577 Fix pubkey auth after change to reuse ses.readbuf as ses.payload Matt Johnston <matt@ucc.asn.au> parents: 853 diff changeset	135 buf_setpos(ses.payload, ses.payload_beginning);
703c7cdd2577 Fix pubkey auth after change to reuse ses.readbuf as ses.payload Matt Johnston <matt@ucc.asn.au> parents: 853 diff changeset	136 buf_putbytes(signbuf,
703c7cdd2577 Fix pubkey auth after change to reuse ses.readbuf as ses.payload Matt Johnston <matt@ucc.asn.au> parents: 853 diff changeset	137 buf_getptr(ses.payload, sign_payload_length),
703c7cdd2577 Fix pubkey auth after change to reuse ses.readbuf as ses.payload Matt Johnston <matt@ucc.asn.au> parents: 853 diff changeset	138 sign_payload_length);
703c7cdd2577 Fix pubkey auth after change to reuse ses.readbuf as ses.payload Matt Johnston <matt@ucc.asn.au> parents: 853 diff changeset	139 buf_incrpos(ses.payload, sign_payload_length);
703c7cdd2577 Fix pubkey auth after change to reuse ses.readbuf as ses.payload Matt Johnston <matt@ucc.asn.au> parents: 853 diff changeset	140
44 45edf30ea0a6 Improved signkey code Matt Johnston <matt@ucc.asn.au> parents: 33 diff changeset	141 buf_setpos(signbuf, 0);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	142
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	143 /* ... and finally verify the signature */
51 095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 44 diff changeset	144 fp = sign_key_fingerprint(keyblob, keybloblen);
761 ac2158e3e403 ecc kind of works, needs fixing/testing Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	145 if (buf_verify(ses.payload, key, signbuf) == DROPBEAR_SUCCESS) {
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	146 dropbear_log(LOG_NOTICE,
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 476 diff changeset	147 "Pubkey auth succeeded for '%s' with key %s from %s",
464 4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep Matt Johnston <matt@ucc.asn.au> parents: 436 diff changeset	148 ses.authstate.pw_name, fp, svr_ses.addrstring);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	149 send_msg_userauth_success();
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	150 } else {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	151 dropbear_log(LOG_WARNING,
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 476 diff changeset	152 "Pubkey auth bad signature for '%s' with key %s from %s",
464 4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep Matt Johnston <matt@ucc.asn.au> parents: 436 diff changeset	153 ses.authstate.pw_name, fp, svr_ses.addrstring);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	154 send_msg_userauth_failure(0, 1);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	155 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	156 m_free(fp);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	157
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	158 out:
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	159 /* cleanup stuff */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	160 if (signbuf) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	161 buf_free(signbuf);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	162 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	163 if (algo) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	164 m_free(algo);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	165 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	166 if (key) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	167 sign_key_free(key);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	168 key = NULL;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	169 }
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 158 diff changeset	170 TRACE(("leave pubkeyauth"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	171 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	172
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	173 /* Reply that the key is valid for auth, this is sent when the user sends
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	174 * a straight copy of their pubkey to test, to avoid having to perform
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	175 * expensive signing operations with a worthless key */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	176 static void send_msg_userauth_pk_ok(unsigned char* algo, unsigned int algolen,
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	177 unsigned char* keyblob, unsigned int keybloblen) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	178
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 158 diff changeset	179 TRACE(("enter send_msg_userauth_pk_ok"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	180 CHECKCLEARTOWRITE();
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	181
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	182 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_PK_OK);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	183 buf_putstring(ses.writepayload, algo, algolen);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	184 buf_putstring(ses.writepayload, keyblob, keybloblen);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	185
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	186 encrypt_packet();
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 158 diff changeset	187 TRACE(("leave send_msg_userauth_pk_ok"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	188
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	189 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	190
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	191 /* Checks whether a specified publickey (and associated algorithm) is an
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	192 * acceptable key for authentication */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	193 /* Returns DROPBEAR_SUCCESS if key is ok for auth, DROPBEAR_FAILURE otherwise */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	194 static int checkpubkey(unsigned char* algo, unsigned int algolen,
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	195 unsigned char* keyblob, unsigned int keybloblen) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	196
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	197 FILE * authfile = NULL;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	198 char * filename = NULL;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	199 int ret = DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	200 buffer * line = NULL;
476 df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	201 unsigned int len, pos;
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	202 buffer * options_buf = NULL;
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	203 int line_num;
475 52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	204
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 158 diff changeset	205 TRACE(("enter checkpubkey"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	206
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	207 /* check that we can use the algo */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	208 if (have_algo(algo, algolen, sshhostkey) == DROPBEAR_FAILURE) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	209 dropbear_log(LOG_WARNING,
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 476 diff changeset	210 "Pubkey auth attempt with unknown algo for '%s' from %s",
464 4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep Matt Johnston <matt@ucc.asn.au> parents: 436 diff changeset	211 ses.authstate.pw_name, svr_ses.addrstring);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	212 goto out;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	213 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	214
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	215 /* check file permissions, also whether file exists */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	216 if (checkpubkeyperms() == DROPBEAR_FAILURE) {
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 158 diff changeset	217 TRACE(("bad authorized_keys permissions, or file doesn't exist"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	218 goto out;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	219 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	220
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	221 /* we don't need to check pw and pw_dir for validity, since
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	222 * its been done in checkpubkeyperms. */
464 4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep Matt Johnston <matt@ucc.asn.au> parents: 436 diff changeset	223 len = strlen(ses.authstate.pw_dir);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	224 /* allocate max required pathname storage,
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	225 * = path + "/.ssh/authorized_keys" + '\0' = pathlen + 22 */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	226 filename = m_malloc(len + 22);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	227 snprintf(filename, len + 22, "%s/.ssh/authorized_keys",
464 4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep Matt Johnston <matt@ucc.asn.au> parents: 436 diff changeset	228 ses.authstate.pw_dir);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	229
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	230 /* open the file */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	231 authfile = fopen(filename, "r");
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	232 if (authfile == NULL) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	233 goto out;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	234 }
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 158 diff changeset	235 TRACE(("checkpubkey: opened authorized_keys OK"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	236
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	237 line = buf_new(MAX_AUTHKEYS_LINE);
476 df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	238 line_num = 0;
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	239
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	240 /* iterate through the lines */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	241 do {
475 52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	242 /* new line : potentially new options */
476 df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	243 if (options_buf) {
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	244 buf_free(options_buf);
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	245 options_buf = NULL;
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	246 }
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	247
51 095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 44 diff changeset	248 if (buf_getline(line, authfile) == DROPBEAR_FAILURE) {
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	249 /* EOF reached */
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 158 diff changeset	250 TRACE(("checkpubkey: authorized_keys EOF reached"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	251 break;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	252 }
476 df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	253 line_num++;
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	254
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	255 if (line->len < MIN_AUTHKEYS_LINE) {
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 158 diff changeset	256 TRACE(("checkpubkey: line too short"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	257 continue; /* line is too short for it to be a valid key */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	258 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	259
475 52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	260 /* check the key type - will fail if there are options */
476 df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	261 TRACE(("a line!"))
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	262
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	263 if (strncmp(buf_getptr(line, algolen), algo, algolen) != 0) {
476 df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	264 int is_comment = 0;
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	265 char *options_start = NULL;
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	266 int options_len = 0;
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	267 int escape, quoted;
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	268
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	269 /* skip over any comments or leading whitespace */
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	270 while (line->pos < line->len) {
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	271 const char c = buf_getbyte(line);
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	272 if (c == ' ' \|\| c == '\t') {
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	273 continue;
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	274 } else if (c == '#') {
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	275 is_comment = 1;
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	276 break;
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	277 }
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	278 buf_incrpos(line, -1);
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	279 break;
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	280 }
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	281 if (is_comment) {
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	282 /* next line */
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	283 continue;
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	284 }
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	285
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	286 /* remember start of options */
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	287 options_start = buf_getptr(line, 1);
475 52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	288 quoted = 0;
476 df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	289 escape = 0;
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	290 options_len = 0;
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	291
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	292 /* figure out where the options are */
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	293 while (line->pos < line->len) {
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	294 const char c = buf_getbyte(line);
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	295 if (!quoted && (c == ' ' \|\| c == '\t')) {
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	296 break;
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	297 }
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	298 escape = (!escape && c == '\\');
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	299 if (!escape && c == '"') {
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	300 quoted = !quoted;
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	301 }
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	302 options_len++;
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	303 }
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	304 options_buf = buf_new(options_len);
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	305 buf_putbytes(options_buf, options_start, options_len);
475 52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	306
853 b11cb2518116 Don't exit fatally if authorized_keys has a line like Matt Johnston <matt@ucc.asn.au> parents: 852 diff changeset	307 /* compare the algorithm. +3 so we have enough bytes to read a space and some base64 characters too. */
b11cb2518116 Don't exit fatally if authorized_keys has a line like Matt Johnston <matt@ucc.asn.au> parents: 852 diff changeset	308 if (line->pos + algolen+3 > line->len) {
476 df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	309 continue;
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	310 }
475 52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	311 if (strncmp(buf_getptr(line, algolen), algo, algolen) != 0) {
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	312 continue;
476 df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	313 }
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	314 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	315 buf_incrpos(line, algolen);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	316
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	317 /* check for space (' ') character */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	318 if (buf_getbyte(line) != ' ') {
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 158 diff changeset	319 TRACE(("checkpubkey: space character expected, isn't there"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	320 continue;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	321 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	322
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	323 /* truncate the line at the space after the base64 data */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	324 pos = line->pos;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	325 for (len = 0; line->pos < line->len; len++) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	326 if (buf_getbyte(line) == ' ') break;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	327 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	328 buf_setpos(line, pos);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	329 buf_setlen(line, line->pos + len);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	330
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 158 diff changeset	331 TRACE(("checkpubkey: line pos = %d len = %d", line->pos, line->len))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	332
436 7282370416a0 Improve known_hosts checking. Matt Johnston <matt@ucc.asn.au> parents: 248 diff changeset	333 ret = cmp_base64_key(keyblob, keybloblen, algo, algolen, line, NULL);
475 52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	334
476 df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	335 if (ret == DROPBEAR_SUCCESS && options_buf) {
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	336 ret = svr_add_pubkey_options(options_buf, line_num, filename);
475 52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	337 }
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	338
51 095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 44 diff changeset	339 if (ret == DROPBEAR_SUCCESS) {
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 44 diff changeset	340 break;
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	341 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	342
51 095d689fed16 - Hostkey checking is mostly there, just aren't appending yet. Matt Johnston <matt@ucc.asn.au> parents: 44 diff changeset	343 /* We continue to the next line otherwise */
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	344
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	345 } while (1);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	346
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	347 out:
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	348 if (authfile) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	349 fclose(authfile);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	350 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	351 if (line) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	352 buf_free(line);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	353 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	354 m_free(filename);
476 df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	355 if (options_buf) {
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	356 buf_free(options_buf);
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review. Matt Johnston <matt@ucc.asn.au> parents: 475 diff changeset	357 }
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 158 diff changeset	358 TRACE(("leave checkpubkey: ret=%d", ret))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	359 return ret;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	360 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	361
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	362
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	363 /* Returns DROPBEAR_SUCCESS if file permissions for pubkeys are ok,
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	364 * DROPBEAR_FAILURE otherwise.
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	365 * Checks that the user's homedir, ~/.ssh, and
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	366 * ~/.ssh/authorized_keys are all owned by either root or the user, and are
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	367 * g-w, o-w */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	368 static int checkpubkeyperms() {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	369
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	370 char* filename = NULL;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	371 int ret = DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	372 unsigned int len;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	373
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 158 diff changeset	374 TRACE(("enter checkpubkeyperms"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	375
464 4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep Matt Johnston <matt@ucc.asn.au> parents: 436 diff changeset	376 if (ses.authstate.pw_dir == NULL) {
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	377 goto out;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	378 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	379
464 4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep Matt Johnston <matt@ucc.asn.au> parents: 436 diff changeset	380 if ((len = strlen(ses.authstate.pw_dir)) == 0) {
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	381 goto out;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	382 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	383
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	384 /* allocate max required pathname storage,
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	385 * = path + "/.ssh/authorized_keys" + '\0' = pathlen + 22 */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	386 filename = m_malloc(len + 22);
464 4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep Matt Johnston <matt@ucc.asn.au> parents: 436 diff changeset	387 strncpy(filename, ses.authstate.pw_dir, len+1);
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	388
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	389 /* check ~ */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	390 if (checkfileperm(filename) != DROPBEAR_SUCCESS) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	391 goto out;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	392 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	393
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	394 /* check ~/.ssh */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	395 strncat(filename, "/.ssh", 5); /* strlen("/.ssh") == 5 */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	396 if (checkfileperm(filename) != DROPBEAR_SUCCESS) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	397 goto out;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	398 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	399
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	400 /* now check ~/.ssh/authorized_keys */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	401 strncat(filename, "/authorized_keys", 16);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	402 if (checkfileperm(filename) != DROPBEAR_SUCCESS) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	403 goto out;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	404 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	405
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	406 /* file looks ok, return success */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	407 ret = DROPBEAR_SUCCESS;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	408
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	409 out:
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	410 m_free(filename);
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	411
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 158 diff changeset	412 TRACE(("leave checkpubkeyperms"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	413 return ret;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	414 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	415
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	416 /* Checks that a file is owned by the user or root, and isn't writable by
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	417 * group or other */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	418 /* returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	419 static int checkfileperm(char * filename) {
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	420 struct stat filestat;
248 bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership Matt Johnston <matt@ucc.asn.au> parents: 241 diff changeset	421 int badperm = 0;
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	422
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 158 diff changeset	423 TRACE(("enter checkfileperm(%s)", filename))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	424
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	425 if (stat(filename, &filestat) != 0) {
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 158 diff changeset	426 TRACE(("leave checkfileperm: stat() != 0"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	427 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	428 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	429 /* check ownership - user or root only*/
464 4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep Matt Johnston <matt@ucc.asn.au> parents: 436 diff changeset	430 if (filestat.st_uid != ses.authstate.pw_uid
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	431 && filestat.st_uid != 0) {
248 bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership Matt Johnston <matt@ucc.asn.au> parents: 241 diff changeset	432 badperm = 1;
bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership Matt Johnston <matt@ucc.asn.au> parents: 241 diff changeset	433 TRACE(("wrong ownership"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	434 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	435 /* check permissions - don't want group or others +w */
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	436 if (filestat.st_mode & (S_IWGRP \| S_IWOTH)) {
248 bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership Matt Johnston <matt@ucc.asn.au> parents: 241 diff changeset	437 badperm = 1;
bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership Matt Johnston <matt@ucc.asn.au> parents: 241 diff changeset	438 TRACE(("wrong perms"))
bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership Matt Johnston <matt@ucc.asn.au> parents: 241 diff changeset	439 }
bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership Matt Johnston <matt@ucc.asn.au> parents: 241 diff changeset	440 if (badperm) {
bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership Matt Johnston <matt@ucc.asn.au> parents: 241 diff changeset	441 if (!ses.authstate.perm_warn) {
bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership Matt Johnston <matt@ucc.asn.au> parents: 241 diff changeset	442 ses.authstate.perm_warn = 1;
bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership Matt Johnston <matt@ucc.asn.au> parents: 241 diff changeset	443 dropbear_log(LOG_INFO, "%s must be owned by user or root, and not writable by others", filename);
bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership Matt Johnston <matt@ucc.asn.au> parents: 241 diff changeset	444 }
bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership Matt Johnston <matt@ucc.asn.au> parents: 241 diff changeset	445 TRACE(("leave checkfileperm: failure perms/owner"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	446 return DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	447 }
248 bf64e666f99b Log when pubkey auth fails because of bad pubkey perms/ownership Matt Johnston <matt@ucc.asn.au> parents: 241 diff changeset	448
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 158 diff changeset	449 TRACE(("leave checkfileperm: success"))
4 fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	450 return DROPBEAR_SUCCESS;
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	451 }
fe6bca95afa7 Makefile.in contains updated files required Matt Johnston <matt@ucc.asn.au> parents: diff changeset	452
475 52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys. Matt Johnston <matt@ucc.asn.au> parents: 464 diff changeset	453 #endif

Mercurial > dropbear

annotate svr-authpubkey.c @ 1060:4c733310c21d nocircbuffer