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 1.1.4.8 2002/09/03 20:43:25 guus Exp $
41 #include "connection.h"
48 int send_key_changed(connection_t *c, node_t *n)
53 /* Only send this message if some other daemon requested our key previously.
54 This reduces unnecessary key_changed broadcasts.
57 if(n == myself && !mykeyused)
60 for(node = connection_tree->head; node; node = node->next)
62 other = (connection_t *)node->data;
63 if(other->status.active && other != c)
64 send_request(other, "%d %lx %s", KEY_CHANGED, random(), n->name);
70 int key_changed_h(connection_t *c)
72 char name[MAX_STRING_SIZE];
77 if(sscanf(c->buffer, "%*d %*x "MAX_STRING, name) != 1)
79 syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "KEY_CHANGED",
80 c->name, c->hostname);
84 if(seen_request(c->buffer))
87 n = lookup_node(name);
91 syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist"), "KEY_CHANGED",
92 c->name, c->hostname, name);
96 n->status.validkey = 0;
97 n->status.waitingforkey = 0;
101 for(node = connection_tree->head; node; node = node->next)
103 other = (connection_t *)node->data;
104 if(other->status.active && other != c)
105 send_request(other, "%s", c->buffer);
111 int send_req_key(connection_t *c, node_t *from, node_t *to)
114 return send_request(c, "%d %s %s", REQ_KEY,
115 from->name, to->name);
118 int req_key_h(connection_t *c)
120 char from_name[MAX_STRING_SIZE];
121 char to_name[MAX_STRING_SIZE];
124 if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING, from_name, to_name) != 2)
126 syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "REQ_KEY",
127 c->name, c->hostname);
131 from = lookup_node(from_name);
135 syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"), "REQ_KEY",
136 c->name, c->hostname, from_name);
140 to = lookup_node(to_name);
144 syslog(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"), "REQ_KEY",
145 c->name, c->hostname, to_name);
149 /* Check if this key request is for us */
151 if(to == myself) /* Yes, send our own key back */
154 from->sent_seqno = 0;
155 send_ans_key(c, myself, from);
160 if(to->status.validkey)
162 send_ans_key(c, to, from);
166 send_req_key(to->nexthop->connection, from, to);
173 int send_ans_key(connection_t *c, node_t *from, node_t *to)
175 char key[MAX_STRING_SIZE];
177 bin2hex(from->key, key, from->keylength);
178 key[from->keylength * 2] = '\0';
180 return send_request(c, "%d %s %s %s %d %d %d %d", ANS_KEY,
181 from->name, to->name, key, from->cipher?from->cipher->nid:0, from->digest?from->digest->type:0, from->maclength, from->compression);
184 int ans_key_h(connection_t *c)
186 char from_name[MAX_STRING_SIZE];
187 char to_name[MAX_STRING_SIZE];
188 char key[MAX_STRING_SIZE];
189 int cipher, digest, maclength, compression;
192 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)
194 syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ANS_KEY",
195 c->name, c->hostname);
199 from = lookup_node(from_name);
203 syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"), "ANS_KEY",
204 c->name, c->hostname, from_name);
208 to = lookup_node(to_name);
212 syslog(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"), "ANS_KEY",
213 c->name, c->hostname, to_name);
217 /* Forward it if necessary */
221 return send_request(to->nexthop->connection, "%s", c->buffer);
224 /* Update our copy of the origin's packet key */
229 from->key = xstrdup(key);
230 from->keylength = strlen(key) / 2;
231 hex2bin(from->key, from->key, from->keylength);
232 from->key[from->keylength] = '\0';
234 from->status.validkey = 1;
235 from->status.waitingforkey = 0;
236 from->received_seqno = 0;
238 /* Check and lookup cipher and digest algorithms */
242 from->cipher = EVP_get_cipherbynid(cipher);
245 syslog(LOG_ERR, _("Node %s (%s) uses unknown cipher!"), from->name, from->hostname);
248 if(from->keylength != from->cipher->key_len + from->cipher->iv_len)
250 syslog(LOG_ERR, _("Node %s (%s) uses wrong keylength!"), from->name, from->hostname);
259 from->maclength = maclength;
263 from->digest = EVP_get_digestbynid(digest);
266 syslog(LOG_ERR, _("Node %s (%s) uses unknown digest!"), from->name, from->hostname);
269 if(from->maclength > from->digest->md_size || from->maclength < 0)
271 syslog(LOG_ERR, _("Node %s (%s) uses bogus MAC length!"), from->name, from->hostname);
280 from->compression = compression;