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 1.1.4.7 2002/06/21 10:11:19 guus Exp $
41 #include "connection.h"
49 int send_key_changed(connection_t *c, node_t *n)
54 /* Only send this message if some other daemon requested our key previously.
55 This reduces unnecessary key_changed broadcasts.
58 if(n == myself && !mykeyused)
61 for(node = connection_tree->head; node; node = node->next)
63 other = (connection_t *)node->data;
64 if(other->status.active && other != c)
65 send_request(other, "%d %lx %s", KEY_CHANGED, random(), n->name);
71 int key_changed_h(connection_t *c)
73 char name[MAX_STRING_SIZE];
78 if(sscanf(c->buffer, "%*d %*x "MAX_STRING, name) != 1)
80 syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "KEY_CHANGED",
81 c->name, c->hostname);
85 if(seen_request(c->buffer))
88 n = lookup_node(name);
92 syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist"), "KEY_CHANGED",
93 c->name, c->hostname, name);
97 n->status.validkey = 0;
98 n->status.waitingforkey = 0;
101 /* Tell the others */
103 for(node = connection_tree->head; node; node = node->next)
105 other = (connection_t *)node->data;
106 if(other->status.active && other != c)
107 send_request(other, "%s", c->buffer);
113 int send_req_key(connection_t *c, node_t *from, node_t *to)
116 return send_request(c, "%d %s %s", REQ_KEY,
117 from->name, to->name);
120 int req_key_h(connection_t *c)
122 char from_name[MAX_STRING_SIZE];
123 char to_name[MAX_STRING_SIZE];
126 if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING, from_name, to_name) != 2)
128 syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "REQ_KEY",
129 c->name, c->hostname);
133 from = lookup_node(from_name);
137 syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"), "REQ_KEY",
138 c->name, c->hostname, from_name);
142 to = lookup_node(to_name);
146 syslog(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"), "REQ_KEY",
147 c->name, c->hostname, to_name);
151 /* Check if this key request is for us */
153 if(to == myself) /* Yes, send our own key back */
156 from->received_seqno = 0;
157 send_ans_key(c, myself, from);
162 if(to->status.validkey)
164 send_ans_key(c, to, from);
168 send_req_key(to->nexthop->connection, from, to);
175 int send_ans_key(connection_t *c, node_t *from, node_t *to)
177 char key[MAX_STRING_SIZE];
179 bin2hex(from->key, key, from->keylength);
180 key[from->keylength * 2] = '\0';
182 return send_request(c, "%d %s %s %s %d %d %d %d", ANS_KEY,
183 from->name, to->name, key, from->cipher?from->cipher->nid:0, from->digest?from->digest->type:0, from->maclength, from->compression);
186 int ans_key_h(connection_t *c)
188 char from_name[MAX_STRING_SIZE];
189 char to_name[MAX_STRING_SIZE];
190 char key[MAX_STRING_SIZE];
191 int cipher, digest, maclength, compression;
194 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)
196 syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ANS_KEY",
197 c->name, c->hostname);
201 from = lookup_node(from_name);
205 syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"), "ANS_KEY",
206 c->name, c->hostname, from_name);
210 to = lookup_node(to_name);
214 syslog(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"), "ANS_KEY",
215 c->name, c->hostname, to_name);
219 /* Forward it if necessary */
223 return send_request(to->nexthop->connection, "%s", c->buffer);
226 /* Update our copy of the origin's packet key */
231 from->key = xstrdup(key);
232 from->keylength = strlen(key) / 2;
233 hex2bin(from->key, from->key, from->keylength);
234 from->key[from->keylength] = '\0';
236 from->status.validkey = 1;
237 from->status.waitingforkey = 0;
239 /* Check and lookup cipher and digest algorithms */
243 from->cipher = EVP_get_cipherbynid(cipher);
246 syslog(LOG_ERR, _("Node %s (%s) uses unknown cipher!"), from->name, from->hostname);
249 if(from->keylength != from->cipher->key_len + from->cipher->iv_len)
251 syslog(LOG_ERR, _("Node %s (%s) uses wrong keylength!"), from->name, from->hostname);
260 from->maclength = maclength;
264 from->digest = EVP_get_digestbynid(digest);
267 syslog(LOG_ERR, _("Node %s (%s) uses unknown digest!"), from->name, from->hostname);
270 if(from->maclength > from->digest->md_size || from->maclength < 0)
272 syslog(LOG_ERR, _("Node %s (%s) uses bogus MAC length!"), from->name, from->hostname);
281 from->compression = compression;