Mercurial > dropbear
annotate cli-kex.c @ 43:942b22d7dd1c
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| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Mon, 02 Aug 2004 04:25:05 +0000 |
| parents | e2a1eaa19f22 |
| children | 095d689fed16 |
| rev | line source |
|---|---|
| 26 | 1 /* |
| 2 * Dropbear - a SSH2 server | |
| 3 * | |
| 4 * Copyright (c) 2002,2003 Matt Johnston | |
| 5 * All rights reserved. | |
| 6 * | |
| 7 * Permission is hereby granted, free of charge, to any person obtaining a copy | |
| 8 * of this software and associated documentation files (the "Software"), to deal | |
| 9 * in the Software without restriction, including without limitation the rights | |
| 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| 11 * copies of the Software, and to permit persons to whom the Software is | |
| 12 * furnished to do so, subject to the following conditions: | |
| 13 * | |
| 14 * The above copyright notice and this permission notice shall be included in | |
| 15 * all copies or substantial portions of the Software. | |
| 16 * | |
| 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
| 20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
| 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
| 23 * SOFTWARE. */ | |
| 24 | |
| 25 #include "includes.h" | |
| 26 #include "session.h" | |
| 27 #include "dbutil.h" | |
| 28 #include "algo.h" | |
| 29 #include "buffer.h" | |
| 30 #include "session.h" | |
| 31 #include "kex.h" | |
| 32 #include "ssh.h" | |
| 33 #include "packet.h" | |
| 34 #include "bignum.h" | |
| 35 #include "random.h" | |
| 36 #include "runopts.h" | |
| 33 | 37 #include "signkey.h" |
| 26 | 38 |
| 39 | |
| 40 | |
| 41 void send_msg_kexdh_init() { | |
| 42 | |
| 43 cli_ses.dh_e = (mp_int*)m_malloc(sizeof(mp_int)); | |
| 44 cli_ses.dh_x = (mp_int*)m_malloc(sizeof(mp_int)); | |
| 45 | |
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46 m_mp_init_multi(cli_ses.dh_e, cli_ses.dh_x, NULL); |
| 26 | 47 gen_kexdh_vals(cli_ses.dh_e, cli_ses.dh_x); |
| 48 | |
| 49 CHECKCLEARTOWRITE(); | |
| 50 buf_putbyte(ses.writepayload, SSH_MSG_KEXDH_INIT); | |
| 51 buf_putmpint(ses.writepayload, cli_ses.dh_e); | |
| 52 encrypt_packet(); | |
| 53 ses.requirenext = SSH_MSG_KEXDH_REPLY; | |
| 54 } | |
| 55 | |
| 56 /* Handle a diffie-hellman key exchange reply. */ | |
| 57 void recv_msg_kexdh_reply() { | |
| 58 | |
| 59 mp_int dh_f; | |
| 60 sign_key *hostkey = NULL; | |
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61 int type, keylen; |
| 26 | 62 |
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parents:
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63 TRACE(("enter recv_msg_kexdh_reply")); |
| 26 | 64 type = ses.newkeys->algo_hostkey; |
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parents:
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65 TRACE(("type is %d", type)); |
| 26 | 66 |
| 67 hostkey = new_sign_key(); | |
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parents:
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68 keylen = buf_getint(ses.payload); |
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e2a1eaa19f22
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parents:
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69 |
| 26 | 70 if (buf_get_pub_key(ses.payload, hostkey, &type) != DROPBEAR_SUCCESS) { |
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parents:
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71 TRACE(("failed getting pubkey")); |
| 26 | 72 dropbear_exit("Bad KEX packet"); |
| 73 } | |
| 74 | |
| 75 m_mp_init(&dh_f); | |
| 76 if (buf_getmpint(ses.payload, &dh_f) != DROPBEAR_SUCCESS) { | |
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e2a1eaa19f22
Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents:
33
diff
changeset
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77 TRACE(("failed getting mpint")); |
| 26 | 78 dropbear_exit("Bad KEX packet"); |
| 79 } | |
| 80 | |
| 81 kexdh_comb_key(cli_ses.dh_e, cli_ses.dh_x, &dh_f, hostkey); | |
| 82 mp_clear(&dh_f); | |
| 83 | |
| 84 if (buf_verify(ses.payload, hostkey, ses.hash, SHA1_HASH_SIZE) | |
| 85 != DROPBEAR_SUCCESS) { | |
| 86 dropbear_exit("Bad hostkey signature"); | |
| 87 } | |
| 88 | |
| 89 /* XXX TODO */ | |
| 90 dropbear_log(LOG_WARNING,"Not checking hostkey fingerprint for the moment"); | |
| 91 | |
| 92 sign_key_free(hostkey); | |
| 93 hostkey = NULL; | |
| 94 | |
| 95 send_msg_newkeys(); | |
| 96 ses.requirenext = SSH_MSG_NEWKEYS; | |
| 97 TRACE(("leave recv_msg_kexdh_init")); | |
| 98 } |