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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 #include "includes.h" |
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26 #include "session.h" |
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27 #include "dbutil.h" |
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28 #include "algo.h" |
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29 #include "buffer.h" |
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30 #include "session.h" |
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31 #include "kex.h" |
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32 #include "ssh.h" |
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33 #include "packet.h" |
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34 #include "bignum.h" |
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35 #include "random.h" |
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36 #include "runopts.h" |
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37 |
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38 |
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39 |
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40 void send_msg_kexdh_init() { |
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41 |
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42 cli_ses.dh_e = (mp_int*)m_malloc(sizeof(mp_int)); |
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43 cli_ses.dh_x = (mp_int*)m_malloc(sizeof(mp_int)); |
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44 |
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45 m_mp_init_multi(cli_ses.dh_e, cli_ses.dh_x); |
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46 gen_kexdh_vals(cli_ses.dh_e, cli_ses.dh_x); |
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47 |
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48 CHECKCLEARTOWRITE(); |
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49 buf_putbyte(ses.writepayload, SSH_MSG_KEXDH_INIT); |
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50 buf_putmpint(ses.writepayload, cli_ses.dh_e); |
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51 encrypt_packet(); |
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52 ses.requirenext = SSH_MSG_KEXDH_REPLY; |
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53 } |
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54 |
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55 /* Handle a diffie-hellman key exchange reply. */ |
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56 void recv_msg_kexdh_reply() { |
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57 |
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58 mp_int dh_f; |
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59 sign_key *hostkey = NULL; |
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60 int type; |
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61 |
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62 type = ses.newkeys->algo_hostkey; |
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63 |
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64 hostkey = new_sign_key(); |
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65 if (buf_get_pub_key(ses.payload, hostkey, &type) != DROPBEAR_SUCCESS) { |
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66 dropbear_exit("Bad KEX packet"); |
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67 } |
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68 |
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69 m_mp_init(&dh_f); |
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70 if (buf_getmpint(ses.payload, &dh_f) != DROPBEAR_SUCCESS) { |
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71 dropbear_exit("Bad KEX packet"); |
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72 } |
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73 |
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74 kexdh_comb_key(cli_ses.dh_e, cli_ses.dh_x, &dh_f, hostkey); |
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75 mp_clear(&dh_f); |
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76 |
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77 if (buf_verify(ses.payload, hostkey, ses.hash, SHA1_HASH_SIZE) |
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78 != DROPBEAR_SUCCESS) { |
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79 dropbear_exit("Bad hostkey signature"); |
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80 } |
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81 |
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82 /* XXX TODO */ |
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83 dropbear_log(LOG_WARNING,"Not checking hostkey fingerprint for the moment"); |
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84 |
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85 sign_key_free(hostkey); |
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86 hostkey = NULL; |
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87 |
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88 send_msg_newkeys(); |
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89 ses.requirenext = SSH_MSG_NEWKEYS; |
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90 TRACE(("leave recv_msg_kexdh_init")); |
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91 } |
