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 1.1.4.9 2002/09/04 08:02:33 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 send_request(NULL, "%d %lx %s", KEY_CHANGED, random(), n->name);
63 int key_changed_h(connection_t *c)
65 char name[MAX_STRING_SIZE];
70 if(sscanf(c->buffer, "%*d %*x "MAX_STRING, name) != 1)
72 syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "KEY_CHANGED",
73 c->name, c->hostname);
77 if(seen_request(c->buffer))
80 n = lookup_node(name);
84 syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist"), "KEY_CHANGED",
85 c->name, c->hostname, name);
89 n->status.validkey = 0;
90 n->status.waitingforkey = 0;
94 for(node = connection_tree->head; node; node = node->next)
96 other = (connection_t *)node->data;
97 if(other->status.active && other != c)
98 send_request(other, "%s", c->buffer);
104 int send_req_key(connection_t *c, node_t *from, node_t *to)
107 return send_request(c, "%d %s %s", REQ_KEY,
108 from->name, to->name);
111 int req_key_h(connection_t *c)
113 char from_name[MAX_STRING_SIZE];
114 char to_name[MAX_STRING_SIZE];
117 if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING, from_name, to_name) != 2)
119 syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "REQ_KEY",
120 c->name, c->hostname);
124 from = lookup_node(from_name);
128 syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"), "REQ_KEY",
129 c->name, c->hostname, from_name);
133 to = lookup_node(to_name);
137 syslog(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"), "REQ_KEY",
138 c->name, c->hostname, to_name);
142 /* Check if this key request is for us */
144 if(to == myself) /* Yes, send our own key back */
147 from->sent_seqno = 0;
148 send_ans_key(c, myself, from);
153 if(to->status.validkey)
155 send_ans_key(c, to, from);
159 send_req_key(to->nexthop->connection, from, to);
166 int send_ans_key(connection_t *c, node_t *from, node_t *to)
168 char key[MAX_STRING_SIZE];
170 bin2hex(from->key, key, from->keylength);
171 key[from->keylength * 2] = '\0';
173 return send_request(c, "%d %s %s %s %d %d %d %d", ANS_KEY,
174 from->name, to->name, key, from->cipher?from->cipher->nid:0, from->digest?from->digest->type:0, from->maclength, from->compression);
177 int ans_key_h(connection_t *c)
179 char from_name[MAX_STRING_SIZE];
180 char to_name[MAX_STRING_SIZE];
181 char key[MAX_STRING_SIZE];
182 int cipher, digest, maclength, compression;
185 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)
187 syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ANS_KEY",
188 c->name, c->hostname);
192 from = lookup_node(from_name);
196 syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"), "ANS_KEY",
197 c->name, c->hostname, from_name);
201 to = lookup_node(to_name);
205 syslog(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"), "ANS_KEY",
206 c->name, c->hostname, to_name);
210 /* Forward it if necessary */
214 return send_request(to->nexthop->connection, "%s", c->buffer);
217 /* Update our copy of the origin's packet key */
222 from->key = xstrdup(key);
223 from->keylength = strlen(key) / 2;
224 hex2bin(from->key, from->key, from->keylength);
225 from->key[from->keylength] = '\0';
227 from->status.validkey = 1;
228 from->status.waitingforkey = 0;
229 from->received_seqno = 0;
231 /* Check and lookup cipher and digest algorithms */
235 from->cipher = EVP_get_cipherbynid(cipher);
238 syslog(LOG_ERR, _("Node %s (%s) uses unknown cipher!"), from->name, from->hostname);
241 if(from->keylength != from->cipher->key_len + from->cipher->iv_len)
243 syslog(LOG_ERR, _("Node %s (%s) uses wrong keylength!"), from->name, from->hostname);
252 from->maclength = maclength;
256 from->digest = EVP_get_digestbynid(digest);
259 syslog(LOG_ERR, _("Node %s (%s) uses unknown digest!"), from->name, from->hostname);
262 if(from->maclength > from->digest->md_size || from->maclength < 0)
264 syslog(LOG_ERR, _("Node %s (%s) uses bogus MAC length!"), from->name, from->hostname);
273 from->compression = compression;