Mercurial > dropbear

annotate svr-authpubkey.c @ 460:bde853a9e680

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Add support for SSH_ASKPASS_ALWAYS env variable for dbclient. If it (and also SSH_ASKPASS) is set then dbclient will use an external askpass program regardless of whether DISPLAY is set or stdin is a TTY. Suggested by Davyd Madeley for handheld devices.
author Matt Johnston <matt@ucc.asn.au>
date Fri, 14 Sep 2007 00:19:44 +0000
parents 7282370416a0
children 4317be8b7cf9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
4
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 /* Process a pubkey auth request */
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26
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27 #include "includes.h"
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28 #include "session.h"
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29 #include "dbutil.h"
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30 #include "buffer.h"
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31 #include "signkey.h"
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32 #include "auth.h"
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33 #include "ssh.h"
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34 #include "packet.h"
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35 #include "algo.h"
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36
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eee77ac31ccc cleaning up the pubkey defines
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37 #ifdef ENABLE_SVR_PUBKEY_AUTH
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38
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39 #define MIN_AUTHKEYS_LINE 10 /* "ssh-rsa AB" - short but doesn't matter */
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40 #define MAX_AUTHKEYS_LINE 4200 /* max length of a line in authkeys */
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41
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42 static int checkpubkey(unsigned char* algo, unsigned int algolen,
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43 unsigned char* keyblob, unsigned int keybloblen);
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44 static int checkpubkeyperms();
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45 static void send_msg_userauth_pk_ok(unsigned char* algo, unsigned int algolen,
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46 unsigned char* keyblob, unsigned int keybloblen);
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47 static int checkfileperm(char * filename);
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48
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49 /* process a pubkey auth request, sending success or failure message as
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50 * appropriate */
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f789045062e6 Progressing client support
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51 void svr_auth_pubkey() {
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52
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53 unsigned char testkey; /* whether we're just checking if a key is usable */
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54 unsigned char* algo = NULL; /* pubkey algo */
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55 unsigned int algolen;
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56 unsigned char* keyblob = NULL;
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57 unsigned int keybloblen;
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58 buffer * signbuf = NULL;
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59 sign_key * key = NULL;
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60 char* fp = NULL;
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61 int type = -1;
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62
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63 TRACE(("enter pubkeyauth"))
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64
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65 /* 0 indicates user just wants to check if key can be used, 1 is an
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66 * actual attempt*/
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67 testkey = (buf_getbool(ses.payload) == 0);
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69 algo = buf_getstring(ses.payload, &algolen);
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70 keybloblen = buf_getint(ses.payload);
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71 keyblob = buf_getptr(ses.payload, keybloblen);
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72
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73 /* check if the key is valid */
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74 if (checkpubkey(algo, algolen, keyblob, keybloblen) == DROPBEAR_FAILURE) {
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75 send_msg_userauth_failure(0, 0);
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76 goto out;
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77 }
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78
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79 /* let them know that the key is ok to use */
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80 if (testkey) {
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81 send_msg_userauth_pk_ok(algo, algolen, keyblob, keybloblen);
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82 goto out;
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83 }
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84
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85 /* now we can actually verify the signature */
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86
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87 /* get the key */
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88 key = new_sign_key();
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89 type = DROPBEAR_SIGNKEY_ANY;
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90 if (buf_get_pub_key(ses.payload, key, &type) == DROPBEAR_FAILURE) {
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91 send_msg_userauth_failure(0, 1);
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92 goto out;
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93 }
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94
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95 /* create the data which has been signed - this a string containing
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96 * session_id, concatenated with the payload packet up to the signature */
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97 signbuf = buf_new(ses.payload->pos + 4 + SHA1_HASH_SIZE);
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98 buf_putstring(signbuf, ses.session_id, SHA1_HASH_SIZE);
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99 buf_putbytes(signbuf, ses.payload->data, ses.payload->pos);
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100 buf_setpos(signbuf, 0);
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101
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102 /* ... and finally verify the signature */
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103 fp = sign_key_fingerprint(keyblob, keybloblen);
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104 if (buf_verify(ses.payload, key, buf_getptr(signbuf, signbuf->len),
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105 signbuf->len) == DROPBEAR_SUCCESS) {
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106 dropbear_log(LOG_NOTICE,
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364a75cfebab Log the IP along with auth success/fail attempts
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107 "pubkey auth succeeded for '%s' with key %s from %s",
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108 ses.authstate.printableuser, fp, svr_ses.addrstring);
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109 send_msg_userauth_success();
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110 } else {
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111 dropbear_log(LOG_WARNING,
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112 "pubkey auth bad signature for '%s' with key %s from %s",
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113 ses.authstate.printableuser, fp, svr_ses.addrstring);
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114 send_msg_userauth_failure(0, 1);
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115 }
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116 m_free(fp);
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117
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118 out:
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119 /* cleanup stuff */
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120 if (signbuf) {
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121 buf_free(signbuf);
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122 }
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123 if (algo) {
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124 m_free(algo);
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125 }
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126 if (key) {
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127 sign_key_free(key);
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128 key = NULL;
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129 }
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130 TRACE(("leave pubkeyauth"))
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131 }
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132
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133 /* Reply that the key is valid for auth, this is sent when the user sends
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134 * a straight copy of their pubkey to test, to avoid having to perform
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135 * expensive signing operations with a worthless key */
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136 static void send_msg_userauth_pk_ok(unsigned char* algo, unsigned int algolen,
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137 unsigned char* keyblob, unsigned int keybloblen) {
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138
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139 TRACE(("enter send_msg_userauth_pk_ok"))
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140 CHECKCLEARTOWRITE();
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141
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142 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_PK_OK);
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143 buf_putstring(ses.writepayload, algo, algolen);
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144 buf_putstring(ses.writepayload, keyblob, keybloblen);
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145
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146 encrypt_packet();
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147 TRACE(("leave send_msg_userauth_pk_ok"))
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
148
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
149 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
150
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
151 /* 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
152 * acceptable key for authentication */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
153 /* 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
154 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
155 unsigned char* keyblob, unsigned int keybloblen) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
156
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
157 FILE * authfile = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
158 char * filename = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
159 int ret = DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
160 buffer * line = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
161 unsigned int len, pos;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
162
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
163 TRACE(("enter checkpubkey"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
164
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
165 /* check that we can use the algo */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
166 if (have_algo(algo, algolen, sshhostkey) == DROPBEAR_FAILURE) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
167 dropbear_log(LOG_WARNING,
158
364a75cfebab Log the IP along with auth success/fail attempts
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
168 "pubkey auth attempt with unknown algo for '%s' from %s",
364a75cfebab Log the IP along with auth success/fail attempts
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
169 ses.authstate.printableuser, svr_ses.addrstring);
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
170 goto out;
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
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
173 /* check file permissions, also whether file exists */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
174 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
175 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
176 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
177 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
178
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
179 /* 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
180 * its been done in checkpubkeyperms. */
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
181 len = strlen(ses.authstate.pw->pw_dir);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
182 /* allocate max required pathname storage,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
183 * = path + "/.ssh/authorized_keys" + '\0' = pathlen + 22 */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
184 filename = m_malloc(len + 22);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
185 snprintf(filename, len + 22, "%s/.ssh/authorized_keys",
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
186 ses.authstate.pw->pw_dir);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
187
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
188 /* open the file */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
189 authfile = fopen(filename, "r");
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
190 if (authfile == NULL) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
191 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
192 }
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
193 TRACE(("checkpubkey: opened authorized_keys OK"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
194
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
195 line = buf_new(MAX_AUTHKEYS_LINE);
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 /* iterate through the lines */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
198 do {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
199
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
200 if (buf_getline(line, authfile) == DROPBEAR_FAILURE) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
201 /* 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
202 TRACE(("checkpubkey: authorized_keys EOF reached"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
203 break;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
204 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
205
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
206 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
207 TRACE(("checkpubkey: line too short"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
208 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
209 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
210
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
211 /* check the key type - this also stops us from using keys
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
212 * which have options with them */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
213 if (strncmp(buf_getptr(line, algolen), algo, algolen) != 0) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
214 continue;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
215 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
216 buf_incrpos(line, algolen);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
217
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
218 /* check for space (' ') character */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
219 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
220 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
221 continue;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
222 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
223
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
224 /* 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
225 pos = line->pos;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
226 for (len = 0; line->pos < line->len; len++) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
227 if (buf_getbyte(line) == ' ') break;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
228 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229 buf_setpos(line, pos);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
230 buf_setlen(line, line->pos + len);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
231
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
232 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
233
436
7282370416a0 Improve known_hosts checking.
Matt Johnston <matt@ucc.asn.au>
parents: 248
diff changeset
234 ret = cmp_base64_key(keyblob, keybloblen, algo, algolen, line, NULL);
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
235 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
236 break;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
237 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
239 /* We continue to the next line otherwise */
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
240
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
241 } while (1);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
243 out:
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244 if (authfile) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
245 fclose(authfile);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
246 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
247 if (line) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
248 buf_free(line);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
249 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
250 m_free(filename);
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
251 TRACE(("leave checkpubkey: ret=%d", ret))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
252 return ret;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
253 }
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
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
256 /* 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
257 * DROPBEAR_FAILURE otherwise.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
258 * Checks that the user's homedir, ~/.ssh, and
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
259 * ~/.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
260 * g-w, o-w */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
261 static int checkpubkeyperms() {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
262
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
263 char* filename = NULL;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
264 int ret = DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
265 unsigned int len;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
266
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
267 TRACE(("enter checkpubkeyperms"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
268
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
269 if (ses.authstate.pw->pw_dir == NULL) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
270 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
271 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
272
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
273 if ((len = strlen(ses.authstate.pw->pw_dir)) == 0) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
274 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
275 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
276
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
277 /* allocate max required pathname storage,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
278 * = path + "/.ssh/authorized_keys" + '\0' = pathlen + 22 */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
279 filename = m_malloc(len + 22);
33
f789045062e6 Progressing client support
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
280 strncpy(filename, ses.authstate.pw->pw_dir, len+1);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
281
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
282 /* check ~ */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
283 if (checkfileperm(filename) != DROPBEAR_SUCCESS) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
284 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
285 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
286
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
287 /* check ~/.ssh */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
288 strncat(filename, "/.ssh", 5); /* strlen("/.ssh") == 5 */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
289 if (checkfileperm(filename) != DROPBEAR_SUCCESS) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
290 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
291 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
292
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
293 /* now check ~/.ssh/authorized_keys */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
294 strncat(filename, "/authorized_keys", 16);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
295 if (checkfileperm(filename) != DROPBEAR_SUCCESS) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
296 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
297 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
298
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
299 /* file looks ok, return success */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
300 ret = DROPBEAR_SUCCESS;
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301
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302 out:
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303 m_free(filename);
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304
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305 TRACE(("leave checkpubkeyperms"))
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306 return ret;
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307 }
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308
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309 /* Checks that a file is owned by the user or root, and isn't writable by
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310 * group or other */
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311 /* returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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312 static int checkfileperm(char * filename) {
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313 struct stat filestat;
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314 int badperm = 0;
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315
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316 TRACE(("enter checkfileperm(%s)", filename))
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317
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318 if (stat(filename, &filestat) != 0) {
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319 TRACE(("leave checkfileperm: stat() != 0"))
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320 return DROPBEAR_FAILURE;
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321 }
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322 /* check ownership - user or root only*/
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323 if (filestat.st_uid != ses.authstate.pw->pw_uid
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324 && filestat.st_uid != 0) {
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325 badperm = 1;
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326 TRACE(("wrong ownership"))
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327 }
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328 /* check permissions - don't want group or others +w */
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329 if (filestat.st_mode & (S_IWGRP | S_IWOTH)) {
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330 badperm = 1;
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331 TRACE(("wrong perms"))
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332 }
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333 if (badperm) {
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334 if (!ses.authstate.perm_warn) {
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335 ses.authstate.perm_warn = 1;
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336 dropbear_log(LOG_INFO, "%s must be owned by user or root, and not writable by others", filename);
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337 }
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338 TRACE(("leave checkfileperm: failure perms/owner"))
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339 return DROPBEAR_FAILURE;
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340 }
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341
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342 TRACE(("leave checkfileperm: success"))
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343 return DROPBEAR_SUCCESS;
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344 }
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345
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346
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347 #endif