2 protocol_key.c -- handle the meta-protocol, key exchange
3 Copyright (C) 1999-2002 Ivo Timmermans <itimmermans@bigfoot.com>,
4 2000-2002 Guus Sliepen <guus@sliepen.warande.net>
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 2002/04/28 12:46:26 zarq Exp $
36 #include "interface.h"
41 #include "connection.h"
50 int send_key_changed(connection_t *c, node_t *n)
55 /* Only send this message if some other daemon requested our key previously.
56 This reduces unnecessary key_changed broadcasts.
59 if(n == myself && !mykeyused)
62 for(node = connection_tree->head; node; node = node->next)
64 other = (connection_t *)node->data;
65 if(other->status.active && other != c)
66 send_request(other, "%d %lx %s", KEY_CHANGED, random(), n->name);
72 int key_changed_h(connection_t *c)
74 char name[MAX_STRING_SIZE];
79 if(sscanf(c->buffer, "%*d %*x "MAX_STRING, name) != 1)
81 syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "KEY_CHANGED",
82 c->name, c->hostname);
86 if(seen_request(c->buffer))
89 n = lookup_node(name);
93 syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist"), "KEY_CHANGED",
94 c->name, c->hostname, name);
98 n->status.validkey = 0;
99 n->status.waitingforkey = 0;
102 /* Tell the others */
104 for(node = connection_tree->head; node; node = node->next)
106 other = (connection_t *)node->data;
107 if(other->status.active && other != c)
108 send_request(other, "%s", c->buffer);
114 int send_req_key(connection_t *c, node_t *from, node_t *to)
117 return send_request(c, "%d %s %s", REQ_KEY,
118 from->name, to->name);
121 int req_key_h(connection_t *c)
123 char from_name[MAX_STRING_SIZE];
124 char to_name[MAX_STRING_SIZE];
127 if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING, from_name, to_name) != 2)
129 syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "REQ_KEY",
130 c->name, c->hostname);
134 from = lookup_node(from_name);
138 syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"), "REQ_KEY",
139 c->name, c->hostname, from_name);
143 to = lookup_node(to_name);
147 syslog(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"), "REQ_KEY",
148 c->name, c->hostname, to_name);
152 /* Check if this key request is for us */
154 if(to == myself) /* Yes, send our own key back */
157 from->received_seqno = 0;
158 send_ans_key(c, myself, from);
163 if(to->status.validkey)
165 send_ans_key(c, to, from);
169 send_req_key(to->nexthop->connection, from, to);
176 int send_ans_key(connection_t *c, node_t *from, node_t *to)
178 char key[MAX_STRING_SIZE];
180 bin2hex(from->key, key, from->keylength);
181 key[from->keylength * 2] = '\0';
183 return send_request(c, "%d %s %s %s %d %d %d %d", ANS_KEY,
184 from->name, to->name, key, from->cipher?from->cipher->nid:0, from->digest?from->digest->type:0, from->maclength, from->compression);
187 int ans_key_h(connection_t *c)
189 char from_name[MAX_STRING_SIZE];
190 char to_name[MAX_STRING_SIZE];
191 char key[MAX_STRING_SIZE];
192 int cipher, digest, maclength, compression;
195 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)
197 syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ANS_KEY",
198 c->name, c->hostname);
202 from = lookup_node(from_name);
206 syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"), "ANS_KEY",
207 c->name, c->hostname, from_name);
211 to = lookup_node(to_name);
215 syslog(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"), "ANS_KEY",
216 c->name, c->hostname, to_name);
220 /* Forward it if necessary */
224 return send_request(to->nexthop->connection, "%s", c->buffer);
227 /* Update our copy of the origin's packet key */
232 from->key = xstrdup(key);
233 from->keylength = strlen(key) / 2;
234 hex2bin(from->key, from->key, from->keylength);
235 from->key[from->keylength] = '\0';
237 from->status.validkey = 1;
238 from->status.waitingforkey = 0;
240 /* Check and lookup cipher and digest algorithms */
244 from->cipher = EVP_get_cipherbynid(cipher);
247 syslog(LOG_ERR, _("Node %s (%s) uses unknown cipher!"), from->name, from->hostname);
250 if(from->keylength != from->cipher->key_len + from->cipher->iv_len)
252 syslog(LOG_ERR, _("Node %s (%s) uses wrong keylength!"), from->name, from->hostname);
261 from->maclength = maclength;
265 from->digest = EVP_get_digestbynid(digest);
268 syslog(LOG_ERR, _("Node %s (%s) uses unknown digest!"), from->name, from->hostname);
271 if(from->maclength > from->digest->md_size || from->maclength < 0)
273 syslog(LOG_ERR, _("Node %s (%s) uses bogus MAC length!"), from->name, from->hostname);
282 from->compression = compression;