Mercurial > dropbear

annotate cli-agentfwd.c @ 225:ca7e76d981d9 agent-client

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- progress towards client agent forwarding (incomplete and does not compile)
author Matt Johnston <matt@ucc.asn.au>
date Mon, 18 Jul 2005 14:32:52 +0000
parents
children cf376c696dfc
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225
ca7e76d981d9 - progress towards client agent forwarding
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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) 2005 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 /* The basic protocol use to communicate with the agent is defined in
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26 * draft-ylonen-ssh-protocol-00.txt, with the ssh2 extensions defined through
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27 * openssh's implementation. */
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28
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29 #include "includes.h"
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30
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31 #ifdef ENABLE_CLI_AGENTFWD
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32
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33 #include "agentfwd.h"
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34 #include "session.h"
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35 #include "ssh.h"
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36 #include "dbutil.h"
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37 #include "chansession.h"
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38 #include "channel.h"
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39 #include "packet.h"
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40 #include "buffer.h"
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41 #include "random.h"
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42 #include "listener.h"
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43 #include "runopts.h"
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44 #include "atomicio.h"
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45 #include "signkey.h"
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46 #include "auth.h"
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47
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48 static int new_agent_chan(struct Channel * channel);
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49
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50 const struct ChanType chan_cli_agent = {
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51 0, /* sepfds */
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52 "[email protected]",
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53 new_agent_chan,
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54 NULL,
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55 NULL,
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56 NULL
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57 };
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58
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59 static int connect_agent() {
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60
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61 int fd = -1;
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62 char* agent_sock = NULL;
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63
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64 agent_sock = getenv("SSH_AUTH_SOCK");
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65 if (agent_sock == NULL)
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66 return -1;
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67
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68 fd = connect_unix(agent_sock);
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69
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70 return fd;
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71 }
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72
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73 // handle a request for a connection to the locally running ssh-agent
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74 // or forward.
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75 static int new_agent_chan(struct Channel * channel) {
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76
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77 int fd = -1;
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78
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79 if (!cli_opts.agent_fwd)
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80 return SSH_OPEN_ADMINISTRATIVELY_PROHIBITED;
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81
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82 fd = connect_agent();
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83
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84 setnonblocking(fd);
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85
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86 ses.maxfd = MAX(ses.maxfd, fd);
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87
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88 channel->infd = fd;
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89 channel->outfd = fd;
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90
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91 // success
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92 return 0;
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93 }
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94
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95 /* Sends a request to the agent, returning a newly allocated buffer
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96 * with the response */
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97 /* Packet format (from draft-ylonen)
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98 4 bytes Length, msb first. Does not include length itself.
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99 1 byte Packet type. The value 255 is reserved for future extensions.
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100 data Any data, depending on packet type. Encoding as in the ssh packet
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101 protocol.
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102
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103 In this case, data is always empty
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104 */
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105 static buffer * agent_request(int fd, unsigned char type) {
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106
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107 buffer * payload = NULL;
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108 buffer * inbuf = NULL;
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109 size_t readlen = 0;
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110 ssize_t ret;
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111
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112 payload = buf_new(4 + 1);
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113
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114 buf_putint(payload, 1);
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115 buf_putbyte(payload, type);
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116
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117 ret = atomicio(write, fd, buf_getptr(payload, payload->len), payload->len);
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118 if ((size_t)ret != payload->len) {
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119 TRACE(("write failed for agent_request"))
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120 goto out;
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121 }
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122
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123 buf_free(payload);
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124 payload = NULL;
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125
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126 /* Now we read the response */
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127 inbuf = buf_new(4);
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128 ret = atomicio(read, fd, buf_getwriteptr(inbuf, 4), 4);
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129 if (ret != 4) {
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130 TRACE(("read of length failed for agent_request"))
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131 goto out;
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132 }
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133
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134 readlen = buf_getint(inbuf);
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135 if (readlen > MAX_AGENT_REPLY) {
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136 TRACE(("agent reply is too big"));
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137 goto out;
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138 }
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139
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140 buf_resize(inbuf, readlen);
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141 ret = atomicio(read, fd, buf_getwriteptr(inbuf, readlen), readlen);
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142 if ((size_t)ret != readlen) {
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143 TRACE(("read of data failed for agent_request"))
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144 goto out;
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145 }
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146
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147 out:
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148 if (payload)
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149 buf_free(payload);
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150
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151 return inbuf;
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152 }
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153
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154 static SignKeyList * agent_get_key_list(int fd)
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155 {
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156 buffer * inbuf = NULL;
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157 unsigned int num = 0;
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158 unsigned char packet_type;
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159 unsigned int i;
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160 struct SignKeyList *retkey = NULL, *key = NULL;
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161 int ret;
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162
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163 inbuf = agent_request(fd, SSH2_AGENTC_REQUEST_IDENTITIES);
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164 if (!inbuf) {
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165 goto out;
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166 }
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167
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168 /* The reply has a format of:
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169 * byte packet_type
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170 * int num_keys
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171 *
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172 * string keyblob1
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173 * string comment1
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174 * ...
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175 * string keyblob(n)
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176 * string comment(n)
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177 */
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178 packet_type = buf_getbyte(inbuf);
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179 if (packet_type != SSH2_AGENT_IDENTITIES_ANSWER) {
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180 goto out;
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181 }
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182
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183 num = buf_getint(inbuf);
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184 for (i = 0; i < num; i++) {
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185 sign_key * pubkey = NULL;
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186 char key_type = DROPBEAR_SIGNKEY_ANY;
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187 struct SignKeyList *nextkey = NULL;
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188
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189 nextkey = (struct SignKeyList*)m_malloc(sizeof(struct SignKeyList));
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190 if (key)
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191 key->next = nextkey;
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192 else
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193 retkey = nextkey;
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194 key = nextkey;
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195
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196 pubkey = new_sign_key();
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197 ret = buf_get_pub_key(inbuf, pubkey, &key_type);
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198 if (ret != DROPBEAR_SUCCESS) {
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199 /* This is slack, properly would cleanup vars etc */
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200 dropbear_exit("Bad pubkey received from agent");
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201 }
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202
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203 key->key = pubkey;
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204 key->next = NULL;
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205 key->type = key_type;
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206 key->source = SIGNKEY_SOURCE_AGENT;
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207
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208 /* We'll ignore the comment */
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209 buf_eatstring(inbuf);
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210 }
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211
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212 out:
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213 if (inbuf) {
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214 buf_free(inbuf);
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215 inbuf = NULL;
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216 }
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217
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218 return retkey;
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219 }
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220
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221 /* return DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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222 SignKeyList * load_agent_keys()
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223 {
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224
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225 SignKeyList * ret_list;
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226 int fd;
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227 fd = connect_agent();
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228 if (fd < 0) {
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229 dropbear_log(LOG_INFO, "Failed to connect to agent");
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230 return NULL;
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231 }
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232
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233 ret_list = agent_get_key_list(fd);
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234 close(fd);
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235 }
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236
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237 // general procedure:
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238 // - get the list of keys from the agent
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239 // - foreach, send a dummy userauth_pubkey message to the server and see
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240 // if it lets us in
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241 // - if it does, sign and auth
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242 // - if not, repeat.
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243 //
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244
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245 #endif