2 protocol_key.c -- handle the meta-protocol, key exchange
3 Copyright (C) 1999-2002 Ivo Timmermans <ivo@o2w.nl>,
4 2000-2002 Guus Sliepen <guus@sliepen.eu.org>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 $Id: protocol_key.c,v 1.1.4.12 2002/09/09 19:40:05 guus Exp $
41 #include "connection.h"
48 int send_key_changed(connection_t *c, node_t *n)
51 /* Only send this message if some other daemon requested our key previously.
52 This reduces unnecessary key_changed broadcasts.
55 if(n == myself && !mykeyused)
58 return send_request(c, "%d %lx %s", KEY_CHANGED, random(), n->name);
61 int key_changed_h(connection_t *c)
63 char name[MAX_STRING_SIZE];
66 if(sscanf(c->buffer, "%*d %*x "MAX_STRING, name) != 1)
68 syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "KEY_CHANGED",
69 c->name, c->hostname);
73 if(seen_request(c->buffer))
76 n = lookup_node(name);
80 syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist"), "KEY_CHANGED",
81 c->name, c->hostname, name);
85 n->status.validkey = 0;
86 n->status.waitingforkey = 0;
95 int send_req_key(connection_t *c, node_t *from, node_t *to)
98 return send_request(c, "%d %s %s", REQ_KEY,
99 from->name, to->name);
102 int req_key_h(connection_t *c)
104 char from_name[MAX_STRING_SIZE];
105 char to_name[MAX_STRING_SIZE];
108 if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING, from_name, to_name) != 2)
110 syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "REQ_KEY",
111 c->name, c->hostname);
115 from = lookup_node(from_name);
119 syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"), "REQ_KEY",
120 c->name, c->hostname, from_name);
124 to = lookup_node(to_name);
128 syslog(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"), "REQ_KEY",
129 c->name, c->hostname, to_name);
133 /* Check if this key request is for us */
135 if(to == myself) /* Yes, send our own key back */
138 from->received_seqno = 0;
139 send_ans_key(c, myself, from);
144 if(to->status.validkey)
146 send_ans_key(c, to, from);
150 send_req_key(to->nexthop->connection, from, to);
157 int send_ans_key(connection_t *c, node_t *from, node_t *to)
159 char key[MAX_STRING_SIZE];
161 bin2hex(from->key, key, from->keylength);
162 key[from->keylength * 2] = '\0';
164 return send_request(c, "%d %s %s %s %d %d %d %d", ANS_KEY,
165 from->name, to->name, key, from->cipher?from->cipher->nid:0, from->digest?from->digest->type:0, from->maclength, from->compression);
168 int ans_key_h(connection_t *c)
170 char from_name[MAX_STRING_SIZE];
171 char to_name[MAX_STRING_SIZE];
172 char key[MAX_STRING_SIZE];
173 int cipher, digest, maclength, compression;
176 if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING" "MAX_STRING" %d %d %d %d", from_name, to_name, key, &cipher, &digest, &maclength, &compression) != 7)
178 syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ANS_KEY",
179 c->name, c->hostname);
183 from = lookup_node(from_name);
187 syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"), "ANS_KEY",
188 c->name, c->hostname, from_name);
192 to = lookup_node(to_name);
196 syslog(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"), "ANS_KEY",
197 c->name, c->hostname, to_name);
201 /* Forward it if necessary */
205 return send_request(to->nexthop->connection, "%s", c->buffer);
208 /* Update our copy of the origin's packet key */
213 from->key = xstrdup(key);
214 from->keylength = strlen(key) / 2;
215 hex2bin(from->key, from->key, from->keylength);
216 from->key[from->keylength] = '\0';
218 from->status.validkey = 1;
219 from->status.waitingforkey = 0;
220 from->sent_seqno = 0;
222 /* Check and lookup cipher and digest algorithms */
226 from->cipher = EVP_get_cipherbynid(cipher);
229 syslog(LOG_ERR, _("Node %s (%s) uses unknown cipher!"), from->name, from->hostname);
232 if(from->keylength != from->cipher->key_len + from->cipher->iv_len)
234 syslog(LOG_ERR, _("Node %s (%s) uses wrong keylength!"), from->name, from->hostname);
243 from->maclength = maclength;
247 from->digest = EVP_get_digestbynid(digest);
250 syslog(LOG_ERR, _("Node %s (%s) uses unknown digest!"), from->name, from->hostname);
253 if(from->maclength > from->digest->md_size || from->maclength < 0)
255 syslog(LOG_ERR, _("Node %s (%s) uses bogus MAC length!"), from->name, from->hostname);
264 from->compression = compression;