annotate cli-authpubkey.c @ 982:fd2e8bbb0333

Make sure hostkeys are flushed to disk to avoid empty files if the power fails. Based on patch from Peter Korsgaard
author Matt Johnston <matt@ucc.asn.au>
date Sat, 08 Nov 2014 22:15:16 +0800
parents a78a38e402d1
children 0da8ba489c23
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74
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1 /*
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2 * Dropbear SSH
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * Copyright (c) 2004 by Mihnea Stoenescu
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6 * All rights reserved.
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7 *
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8 * Permission is hereby granted, free of charge, to any person obtaining a copy
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9 * of this software and associated documentation files (the "Software"), to deal
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10 * in the Software without restriction, including without limitation the rights
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11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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12 * copies of the Software, and to permit persons to whom the Software is
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13 * furnished to do so, subject to the following conditions:
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14 *
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15 * The above copyright notice and this permission notice shall be included in
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16 * all copies or substantial portions of the Software.
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17 *
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18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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24 * SOFTWARE. */
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25
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26 #include "includes.h"
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27 #include "buffer.h"
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28 #include "dbutil.h"
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29 #include "session.h"
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30 #include "ssh.h"
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31 #include "runopts.h"
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32 #include "auth.h"
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33 #include "agentfwd.h"
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34
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35 #ifdef ENABLE_CLI_PUBKEY_AUTH
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36 static void send_msg_userauth_pubkey(sign_key *key, int type, int realsign);
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37
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38 /* Called when we receive a SSH_MSG_USERAUTH_FAILURE for a pubkey request.
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39 * We use it to remove the key we tried from the list */
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40 void cli_pubkeyfail() {
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41 m_list_elem *iter;
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42 for (iter = cli_opts.privkeys->first; iter; iter = iter->next) {
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43 sign_key *iter_key = (sign_key*)iter->item;
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44
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45 if (iter_key == cli_ses.lastprivkey)
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46 {
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47 /* found the failing key */
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48 list_remove(iter);
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49 sign_key_free(iter_key);
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50 cli_ses.lastprivkey = NULL;
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51 return;
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52 }
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53 }
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54 }
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55
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56 void recv_msg_userauth_pk_ok() {
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57 m_list_elem *iter;
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58 buffer* keybuf = NULL;
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59 char* algotype = NULL;
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60 unsigned int algolen;
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61 int keytype;
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62 unsigned int remotelen;
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63
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64 TRACE(("enter recv_msg_userauth_pk_ok"))
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65
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66 algotype = buf_getstring(ses.payload, &algolen);
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67 keytype = signkey_type_from_name(algotype, algolen);
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68 TRACE(("recv_msg_userauth_pk_ok: type %d", keytype))
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69 m_free(algotype);
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70
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71 keybuf = buf_new(MAX_PUBKEY_SIZE);
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72
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73 remotelen = buf_getint(ses.payload);
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74
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75 /* Iterate through our keys, find which one it was that matched, and
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76 * send a real request with that key */
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77 for (iter = cli_opts.privkeys->first; iter; iter = iter->next) {
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78 sign_key *key = (sign_key*)iter->item;
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79 if (key->type != keytype) {
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80 /* Types differed */
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81 TRACE(("types differed"))
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82 continue;
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83 }
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84
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85 /* Now we compare the contents of the key */
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86 keybuf->pos = keybuf->len = 0;
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87 buf_put_pub_key(keybuf, key, keytype);
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88 buf_setpos(keybuf, 0);
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89 buf_incrpos(keybuf, 4); /* first int is the length of the remainder (ie
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90 remotelen) which has already been taken from
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91 the remote buffer */
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92
47
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93
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94 if (keybuf->len-4 != remotelen) {
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95 TRACE(("lengths differed: localh %d remote %d", keybuf->len, remotelen))
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96 /* Lengths differed */
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97 continue;
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98 }
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99 if (memcmp(buf_getptr(keybuf, remotelen),
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100 buf_getptr(ses.payload, remotelen), remotelen) != 0) {
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101 /* Data didn't match this key */
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102 TRACE(("data differed"))
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103 continue;
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104 }
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105
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106 /* Success */
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107 break;
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108 }
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109 buf_free(keybuf);
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110
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111 if (iter != NULL) {
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112 TRACE(("matching key"))
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113 /* XXX TODO: if it's an encrypted key, here we ask for their
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114 * password */
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115 send_msg_userauth_pubkey((sign_key*)iter->item, keytype, 1);
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116 } else {
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117 TRACE(("That was whacky. We got told that a key was valid, but it didn't match our list. Sounds like dodgy code on Dropbear's part"))
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118 }
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119
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120 TRACE(("leave recv_msg_userauth_pk_ok"))
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121 }
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122
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123 void cli_buf_put_sign(buffer* buf, sign_key *key, int type,
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124 buffer *data_buf) {
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125 #ifdef ENABLE_CLI_AGENTFWD
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126 if (key->source == SIGNKEY_SOURCE_AGENT) {
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127 /* Format the agent signature ourselves, as buf_put_sign would. */
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128 buffer *sigblob;
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129 sigblob = buf_new(MAX_PUBKEY_SIZE);
760
f336d232fc63 Make _sign and _verify functions take a buffer* rather than void* and int
Matt Johnston <matt@ucc.asn.au>
parents: 669
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130 agent_buf_sign(sigblob, key, data_buf);
f336d232fc63 Make _sign and _verify functions take a buffer* rather than void* and int
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parents: 669
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131 buf_putbufstring(buf, sigblob);
551
c3f2ec71e3d4 New standard linked list to use, rather than adhoc SignKeyList or TCPFwdList
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parents: 550
diff changeset
132 buf_free(sigblob);
669
a8367733e8cd Slight formatting change for ENABLE_CLI_AGENTFWD if statement
Matt Johnston <matt@ucc.asn.au>
parents: 668
diff changeset
133 } else
a8367733e8cd Slight formatting change for ENABLE_CLI_AGENTFWD if statement
Matt Johnston <matt@ucc.asn.au>
parents: 668
diff changeset
134 #endif /* ENABLE_CLI_AGENTFWD */
a8367733e8cd Slight formatting change for ENABLE_CLI_AGENTFWD if statement
Matt Johnston <matt@ucc.asn.au>
parents: 668
diff changeset
135 {
760
f336d232fc63 Make _sign and _verify functions take a buffer* rather than void* and int
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parents: 669
diff changeset
136 buf_put_sign(buf, key, type, data_buf);
551
c3f2ec71e3d4 New standard linked list to use, rather than adhoc SignKeyList or TCPFwdList
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parents: 550
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137 }
c3f2ec71e3d4 New standard linked list to use, rather than adhoc SignKeyList or TCPFwdList
Matt Johnston <matt@ucc.asn.au>
parents: 550
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138 }
c3f2ec71e3d4 New standard linked list to use, rather than adhoc SignKeyList or TCPFwdList
Matt Johnston <matt@ucc.asn.au>
parents: 550
diff changeset
139
45
9ee8996a375f Pubkey auth is mostly there for the client. Something strange with
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140 /* TODO: make it take an agent reference to use as well */
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Matt Johnston <matt@ucc.asn.au>
parents:
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141 static void send_msg_userauth_pubkey(sign_key *key, int type, int realsign) {
9ee8996a375f Pubkey auth is mostly there for the client. Something strange with
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parents:
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142
9ee8996a375f Pubkey auth is mostly there for the client. Something strange with
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
143 const char *algoname = NULL;
9ee8996a375f Pubkey auth is mostly there for the client. Something strange with
Matt Johnston <matt@ucc.asn.au>
parents:
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144 int algolen;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
145 buffer* sigbuf = NULL;
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parents:
diff changeset
146
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 74
diff changeset
147 TRACE(("enter send_msg_userauth_pubkey"))
45
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
148 CHECKCLEARTOWRITE();
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parents:
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149
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parents:
diff changeset
150 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_REQUEST);
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parents:
diff changeset
151
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parents:
diff changeset
152 buf_putstring(ses.writepayload, cli_opts.username,
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parents:
diff changeset
153 strlen(cli_opts.username));
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parents:
diff changeset
154
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
155 buf_putstring(ses.writepayload, SSH_SERVICE_CONNECTION,
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
156 SSH_SERVICE_CONNECTION_LEN);
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parents:
diff changeset
157
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
158 buf_putstring(ses.writepayload, AUTH_METHOD_PUBKEY,
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
159 AUTH_METHOD_PUBKEY_LEN);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
160
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
161 buf_putbyte(ses.writepayload, realsign);
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162
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parents:
diff changeset
163 algoname = signkey_name_from_type(type, &algolen);
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parents:
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164
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parents:
diff changeset
165 buf_putstring(ses.writepayload, algoname, algolen);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
166 buf_put_pub_key(ses.writepayload, key, type);
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parents:
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167
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
168 if (realsign) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 74
diff changeset
169 TRACE(("realsign"))
45
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
170 /* We put the signature as well - this contains string(session id), then
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
171 * the contents of the write payload to this point */
762
a78a38e402d1 - Fix various hardcoded uses of SHA1
Matt Johnston <matt@ucc.asn.au>
parents: 761
diff changeset
172 sigbuf = buf_new(4 + ses.session_id->len + ses.writepayload->len);
760
f336d232fc63 Make _sign and _verify functions take a buffer* rather than void* and int
Matt Johnston <matt@ucc.asn.au>
parents: 669
diff changeset
173 buf_putbufstring(sigbuf, ses.session_id);
45
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
174 buf_putbytes(sigbuf, ses.writepayload->data, ses.writepayload->len);
761
ac2158e3e403 ecc kind of works, needs fixing/testing
Matt Johnston <matt@ucc.asn.au>
parents: 760
diff changeset
175 cli_buf_put_sign(ses.writepayload, key, type, sigbuf);
45
9ee8996a375f Pubkey auth is mostly there for the client. Something strange with
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
176 buf_free(sigbuf); /* Nothing confidential in the buffer */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
177 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
178
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
179 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: 74
diff changeset
180 TRACE(("leave send_msg_userauth_pubkey"))
45
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
181 }
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parents:
diff changeset
182
551
c3f2ec71e3d4 New standard linked list to use, rather than adhoc SignKeyList or TCPFwdList
Matt Johnston <matt@ucc.asn.au>
parents: 550
diff changeset
183 /* Returns 1 if a key was tried */
45
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
184 int cli_auth_pubkey() {
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185
165
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Matt Johnston <matt@ucc.asn.au>
parents: 74
diff changeset
186 TRACE(("enter cli_auth_pubkey"))
45
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parents:
diff changeset
187
668
405418f7dc5e Fixed compilation with unset ENABLE_{SVR,CLI}_AGENTFWD.
Andrey Mazo <ahippo@yandex.ru>
parents: 560
diff changeset
188 #ifdef ENABLE_CLI_AGENTFWD
560
52d7301e46bd Agent forwarding works
Matt Johnston <matt@ucc.asn.au>
parents: 552
diff changeset
189 if (!cli_opts.agent_keys_loaded) {
225
ca7e76d981d9 - progress towards client agent forwarding
Matt Johnston <matt@ucc.asn.au>
parents: 215
diff changeset
190 /* get the list of available keys from the agent */
560
52d7301e46bd Agent forwarding works
Matt Johnston <matt@ucc.asn.au>
parents: 552
diff changeset
191 cli_load_agent_keys(cli_opts.privkeys);
550
61c3513825b0 Talking to the agent works now. Can't interpret the pubkeys.
Matt Johnston <matt@ucc.asn.au>
parents: 547
diff changeset
192 cli_opts.agent_keys_loaded = 1;
225
ca7e76d981d9 - progress towards client agent forwarding
Matt Johnston <matt@ucc.asn.au>
parents: 215
diff changeset
193 }
668
405418f7dc5e Fixed compilation with unset ENABLE_{SVR,CLI}_AGENTFWD.
Andrey Mazo <ahippo@yandex.ru>
parents: 560
diff changeset
194 #endif
225
ca7e76d981d9 - progress towards client agent forwarding
Matt Johnston <matt@ucc.asn.au>
parents: 215
diff changeset
195
551
c3f2ec71e3d4 New standard linked list to use, rather than adhoc SignKeyList or TCPFwdList
Matt Johnston <matt@ucc.asn.au>
parents: 550
diff changeset
196 if (cli_opts.privkeys->first) {
c3f2ec71e3d4 New standard linked list to use, rather than adhoc SignKeyList or TCPFwdList
Matt Johnston <matt@ucc.asn.au>
parents: 550
diff changeset
197 sign_key * key = (sign_key*)cli_opts.privkeys->first->item;
45
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parents:
diff changeset
198 /* Send a trial request */
551
c3f2ec71e3d4 New standard linked list to use, rather than adhoc SignKeyList or TCPFwdList
Matt Johnston <matt@ucc.asn.au>
parents: 550
diff changeset
199 send_msg_userauth_pubkey(key, key->type, 0);
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Matt Johnston <matt@ucc.asn.au>
parents: 550
diff changeset
200 cli_ses.lastprivkey = key;
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 74
diff changeset
201 TRACE(("leave cli_auth_pubkey-success"))
45
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parents:
diff changeset
202 return 1;
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parents:
diff changeset
203 } else {
552
de3653483ac0 - Client auth using an agent's key works. Still need to implement client
Matt Johnston <matt@ucc.asn.au>
parents: 551
diff changeset
204 /* no more keys left */
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 74
diff changeset
205 TRACE(("leave cli_auth_pubkey-failure"))
45
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parents:
diff changeset
206 return 0;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
207 }
9ee8996a375f Pubkey auth is mostly there for the client. Something strange with
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parents:
diff changeset
208 }
552
de3653483ac0 - Client auth using an agent's key works. Still need to implement client
Matt Johnston <matt@ucc.asn.au>
parents: 551
diff changeset
209
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Matt Johnston <matt@ucc.asn.au>
parents: 551
diff changeset
210 void cli_auth_pubkey_cleanup() {
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Matt Johnston <matt@ucc.asn.au>
parents: 551
diff changeset
211
de3653483ac0 - Client auth using an agent's key works. Still need to implement client
Matt Johnston <matt@ucc.asn.au>
parents: 551
diff changeset
212 #ifdef ENABLE_CLI_AGENTFWD
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Matt Johnston <matt@ucc.asn.au>
parents: 551
diff changeset
213 m_close(cli_opts.agent_fd);
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Matt Johnston <matt@ucc.asn.au>
parents: 551
diff changeset
214 cli_opts.agent_fd = -1;
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Matt Johnston <matt@ucc.asn.au>
parents: 551
diff changeset
215 #endif
de3653483ac0 - Client auth using an agent's key works. Still need to implement client
Matt Johnston <matt@ucc.asn.au>
parents: 551
diff changeset
216
de3653483ac0 - Client auth using an agent's key works. Still need to implement client
Matt Johnston <matt@ucc.asn.au>
parents: 551
diff changeset
217 while (cli_opts.privkeys->first) {
de3653483ac0 - Client auth using an agent's key works. Still need to implement client
Matt Johnston <matt@ucc.asn.au>
parents: 551
diff changeset
218 sign_key * key = list_remove(cli_opts.privkeys->first);
de3653483ac0 - Client auth using an agent's key works. Still need to implement client
Matt Johnston <matt@ucc.asn.au>
parents: 551
diff changeset
219 sign_key_free(key);
de3653483ac0 - Client auth using an agent's key works. Still need to implement client
Matt Johnston <matt@ucc.asn.au>
parents: 551
diff changeset
220 }
de3653483ac0 - Client auth using an agent's key works. Still need to implement client
Matt Johnston <matt@ucc.asn.au>
parents: 551
diff changeset
221 }
68
eee77ac31ccc cleaning up the pubkey defines
Matt Johnston <matt@ucc.asn.au>
parents: 62
diff changeset
222 #endif /* Pubkey auth */