From 5bf4b88666ecafe190e8ed71d6c14c9de8d16e1f Mon Sep 17 00:00:00 2001 From: Guus Sliepen Date: Mon, 11 Feb 2002 10:05:58 +0000 Subject: [PATCH] Forgot to merge new files from pre5. --- src/event.c | 109 ++++++++ src/event.h | 48 ++++ src/protocol_auth.c | 561 ++++++++++++++++++++++++++++++++++++++++++ src/protocol_edge.c | 291 ++++++++++++++++++++++ src/protocol_key.c | 272 ++++++++++++++++++++ src/protocol_misc.c | 193 +++++++++++++++ src/protocol_subnet.c | 231 +++++++++++++++++ 7 files changed, 1705 insertions(+) create mode 100644 src/event.c create mode 100644 src/event.h create mode 100644 src/protocol_auth.c create mode 100644 src/protocol_edge.c create mode 100644 src/protocol_key.c create mode 100644 src/protocol_misc.c create mode 100644 src/protocol_subnet.c diff --git a/src/event.c b/src/event.c new file mode 100644 index 0000000..d11f91c --- /dev/null +++ b/src/event.c @@ -0,0 +1,109 @@ +/* + event.c -- event queue + Copyright (C) 2002 Guus Sliepen , + 2002 Ivo Timmermans + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + + $Id: event.c,v 1.1.4.1 2002/02/11 10:05:58 guus Exp $ +*/ + +#include "config.h" + +#include +#include +#include +#include +#include +#include + +#include "event.h" + +#include "system.h" + +avl_tree_t *event_tree; + +int id; + +int event_compare(event_t *a, event_t *b) +{ + if(a->time > b->time) + return 1; + if(a->time < b->time) + return -1; + return a->id - b->id; +} + +void init_events(void) +{ +cp + event_tree = avl_alloc_tree((avl_compare_t)event_compare, NULL); +cp +} + +void exit_events(void) +{ +cp + avl_delete_tree(event_tree); +cp +} + +event_t *new_event(void) +{ + event_t *event; +cp + event = (event_t *)xmalloc_and_zero(sizeof(*event)); +cp + return event; +} + +void free_event(event_t *event) +{ +cp + free(event); +cp +} + +void event_add(event_t *event) +{ +cp + event->id = ++id; + avl_insert(event_tree, event); +cp +} + +void event_del(event_t *event) +{ +cp + avl_delete(event_tree, event); +cp +} + +event_t *get_expired_event(void) +{ + event_t *event; +cp + if(event_tree->head) + { + event = (event_t *)event_tree->head->data; + if(event->time < time(NULL)) + { + avl_delete(event_tree, event); + return event; + } + } +cp + return NULL; +} diff --git a/src/event.h b/src/event.h new file mode 100644 index 0000000..7a35612 --- /dev/null +++ b/src/event.h @@ -0,0 +1,48 @@ +/* + event.h -- header for event.c + Copyright (C) 2002 Guus Sliepen , + 2002 Ivo Timmermans + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + + $Id: event.h,v 1.1.4.1 2002/02/11 10:05:58 guus Exp $ +*/ + +#ifndef __TINC_EVENT_H__ +#define __TINC_EVENT_H__ + +#include +#include + +avl_tree_t *event_tree; + +typedef void (*event_handler_t)(void *); + +typedef struct { + time_t time; + int id; + event_handler_t handler; + void *data; +} event_t; + +extern void init_events(void); +extern void exit_events(void); +extern event_t *new_event(void); +extern void free_event(event_t *); +extern void event_add(event_t *); +extern void event_del(event_t *); +extern event_t *get_expired_event(void); + +#endif /* __TINC_EVENT_H__ */ diff --git a/src/protocol_auth.c b/src/protocol_auth.c new file mode 100644 index 0000000..1fad4b7 --- /dev/null +++ b/src/protocol_auth.c @@ -0,0 +1,561 @@ +/* + protocol_auth.c -- handle the meta-protocol, authentication + Copyright (C) 1999-2002 Ivo Timmermans , + 2000-2002 Guus Sliepen + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + + $Id: protocol_auth.c,v 1.1.4.1 2002/02/11 10:05:58 guus Exp $ +*/ + +#include "config.h" + +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include +#include +#include + +#ifndef HAVE_RAND_PSEUDO_BYTES +#define RAND_pseudo_bytes RAND_bytes +#endif + +#include "conf.h" +#include "net.h" +#include "netutl.h" +#include "protocol.h" +#include "meta.h" +#include "connection.h" +#include "node.h" +#include "edge.h" +#include "graph.h" + +#include "system.h" + +int send_id(connection_t *c) +{ +cp + return send_request(c, "%d %s %d", ID, myself->connection->name, myself->connection->protocol_version); +} + +int id_h(connection_t *c) +{ + char name[MAX_STRING_SIZE]; + int bla; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING" %d", name, &c->protocol_version) != 2) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ID", c->name, c->hostname); + return -1; + } + + /* Check if identity is a valid name */ + + if(check_id(name)) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ID", c->name, c->hostname, "invalid name"); + return -1; + } + + /* If we set c->name in advance, make sure we are connected to the right host */ + + if(c->name) + { + if(strcmp(c->name, name)) + { + syslog(LOG_ERR, _("Peer %s is %s instead of %s"), c->hostname, name, c->name); + return -1; + } + } + else + c->name = xstrdup(name); + + /* Check if version matches */ + + if(c->protocol_version != myself->connection->protocol_version) + { + syslog(LOG_ERR, _("Peer %s (%s) uses incompatible version %d"), + c->name, c->hostname, c->protocol_version); + return -1; + } + + if(bypass_security) + { + if(!c->config_tree) + init_configuration(&c->config_tree); + c->allow_request = ACK; + return send_ack(c); + } + + if(!c->config_tree) + { + init_configuration(&c->config_tree); + + if((bla = read_connection_config(c))) + { + syslog(LOG_ERR, _("Peer %s had unknown identity (%s)"), c->hostname, c->name); + return -1; + } + } + + if(read_rsa_public_key(c)) + { + return -1; + } + + /* Check some options */ + + if((get_config_bool(lookup_config(c->config_tree, "IndirectData"), &bla) && bla) || myself->options & OPTION_INDIRECT) + c->options |= OPTION_INDIRECT; + + if((get_config_bool(lookup_config(c->config_tree, "TCPOnly"), &bla) && bla) || myself->options & OPTION_TCPONLY) + c->options |= OPTION_TCPONLY | OPTION_INDIRECT; + + c->allow_request = METAKEY; +cp + return send_metakey(c); +} + +int send_metakey(connection_t *c) +{ + char buffer[MAX_STRING_SIZE]; + int len, x; +cp + len = RSA_size(c->rsa_key); + + /* Allocate buffers for the meta key */ + + if(!c->outkey) + c->outkey = xmalloc(len); + + if(!c->outctx) + c->outctx = xmalloc(sizeof(*c->outctx)); +cp + /* Copy random data to the buffer */ + + RAND_bytes(c->outkey, len); + + /* The message we send must be smaller than the modulus of the RSA key. + By definition, for a key of k bits, the following formula holds: + + 2^(k-1) <= modulus < 2^(k) + + Where ^ means "to the power of", not "xor". + This means that to be sure, we must choose our message < 2^(k-1). + This can be done by setting the most significant bit to zero. + */ + + c->outkey[0] &= 0x7F; + + if(debug_lvl >= DEBUG_SCARY_THINGS) + { + bin2hex(c->outkey, buffer, len); + buffer[len*2] = '\0'; + syslog(LOG_DEBUG, _("Generated random meta key (unencrypted): %s"), buffer); + } + + /* Encrypt the random data + + We do not use one of the PKCS padding schemes here. + This is allowed, because we encrypt a totally random string + with a length equal to that of the modulus of the RSA key. + */ + + if(RSA_public_encrypt(len, c->outkey, buffer, c->rsa_key, RSA_NO_PADDING) != len) + { + syslog(LOG_ERR, _("Error during encryption of meta key for %s (%s)"), c->name, c->hostname); + return -1; + } +cp + /* Convert the encrypted random data to a hexadecimal formatted string */ + + bin2hex(buffer, buffer, len); + buffer[len*2] = '\0'; + + /* Send the meta key */ + + x = send_request(c, "%d %s", METAKEY, buffer); + + /* Further outgoing requests are encrypted with the key we just generated */ + + EVP_EncryptInit(c->outctx, EVP_bf_cfb(), + c->outkey + len - EVP_bf_cfb()->key_len, + c->outkey + len - EVP_bf_cfb()->key_len - EVP_bf_cfb()->iv_len); + + c->status.encryptout = 1; +cp + return x; +} + +int metakey_h(connection_t *c) +{ + char buffer[MAX_STRING_SIZE]; + int len; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING, buffer) != 1) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "METAKEY", c->name, c->hostname); + return -1; + } +cp + len = RSA_size(myself->connection->rsa_key); + + /* Check if the length of the meta key is all right */ + + if(strlen(buffer) != len*2) + { + syslog(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, "wrong keylength"); + return -1; + } + + /* Allocate buffers for the meta key */ +cp + if(!c->inkey) + c->inkey = xmalloc(len); + + if(!c->inctx) + c->inctx = xmalloc(sizeof(*c->inctx)); + + /* Convert the challenge from hexadecimal back to binary */ +cp + hex2bin(buffer,buffer,len); + + /* Decrypt the meta key */ +cp + if(RSA_private_decrypt(len, buffer, c->inkey, myself->connection->rsa_key, RSA_NO_PADDING) != len) /* See challenge() */ + { + syslog(LOG_ERR, _("Error during encryption of meta key for %s (%s)"), c->name, c->hostname); + return -1; + } + + if(debug_lvl >= DEBUG_SCARY_THINGS) + { + bin2hex(c->inkey, buffer, len); + buffer[len*2] = '\0'; + syslog(LOG_DEBUG, _("Received random meta key (unencrypted): %s"), buffer); + } + + /* All incoming requests will now be encrypted. */ +cp + EVP_DecryptInit(c->inctx, EVP_bf_cfb(), + c->inkey + len - EVP_bf_cfb()->key_len, + c->inkey + len - EVP_bf_cfb()->key_len - EVP_bf_cfb()->iv_len); + + c->status.decryptin = 1; + + c->allow_request = CHALLENGE; +cp + return send_challenge(c); +} + +int send_challenge(connection_t *c) +{ + char buffer[MAX_STRING_SIZE]; + int len, x; +cp + /* CHECKME: what is most reasonable value for len? */ + + len = RSA_size(c->rsa_key); + + /* Allocate buffers for the challenge */ + + if(!c->hischallenge) + c->hischallenge = xmalloc(len); +cp + /* Copy random data to the buffer */ + + RAND_bytes(c->hischallenge, len); + +cp + /* Convert to hex */ + + bin2hex(c->hischallenge, buffer, len); + buffer[len*2] = '\0'; + +cp + /* Send the challenge */ + + x = send_request(c, "%d %s", CHALLENGE, buffer); +cp + return x; +} + +int challenge_h(connection_t *c) +{ + char buffer[MAX_STRING_SIZE]; + int len; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING, buffer) != 1) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "CHALLENGE", c->name, c->hostname); + return -1; + } + + len = RSA_size(myself->connection->rsa_key); + + /* Check if the length of the challenge is all right */ + + if(strlen(buffer) != len*2) + { + syslog(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, "wrong challenge length"); + return -1; + } + + /* Allocate buffers for the challenge */ + + if(!c->mychallenge) + c->mychallenge = xmalloc(len); + + /* Convert the challenge from hexadecimal back to binary */ + + hex2bin(buffer,c->mychallenge,len); + + c->allow_request = CHAL_REPLY; + + /* Rest is done by send_chal_reply() */ +cp + return send_chal_reply(c); +} + +int send_chal_reply(connection_t *c) +{ + char hash[SHA_DIGEST_LENGTH*2+1]; +cp + /* Calculate the hash from the challenge we received */ + + SHA1(c->mychallenge, RSA_size(myself->connection->rsa_key), hash); + + /* Convert the hash to a hexadecimal formatted string */ + + bin2hex(hash,hash,SHA_DIGEST_LENGTH); + hash[SHA_DIGEST_LENGTH*2] = '\0'; + + /* Send the reply */ + +cp + return send_request(c, "%d %s", CHAL_REPLY, hash); +} + +int chal_reply_h(connection_t *c) +{ + char hishash[MAX_STRING_SIZE]; + char myhash[SHA_DIGEST_LENGTH]; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING, hishash) != 1) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "CHAL_REPLY", c->name, c->hostname); + return -1; + } + + /* Check if the length of the hash is all right */ + + if(strlen(hishash) != SHA_DIGEST_LENGTH*2) + { + syslog(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, _("wrong challenge reply length")); + return -1; + } + + /* Convert the hash to binary format */ + + hex2bin(hishash, hishash, SHA_DIGEST_LENGTH); + + /* Calculate the hash from the challenge we sent */ + + SHA1(c->hischallenge, RSA_size(c->rsa_key), myhash); + + /* Verify the incoming hash with the calculated hash */ + + if(memcmp(hishash, myhash, SHA_DIGEST_LENGTH)) + { + syslog(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, _("wrong challenge reply")); + if(debug_lvl >= DEBUG_SCARY_THINGS) + { + bin2hex(myhash, hishash, SHA_DIGEST_LENGTH); + hishash[SHA_DIGEST_LENGTH*2] = '\0'; + syslog(LOG_DEBUG, _("Expected challenge reply: %s"), hishash); + } + return -1; + } + + /* Identity has now been positively verified. + Send an acknowledgement with the rest of the information needed. + */ + + c->allow_request = ACK; +cp + return send_ack(c); +} + +int send_ack(connection_t *c) +{ + /* ACK message contains rest of the information the other end needs + to create node_t and edge_t structures. */ + + int x; + char *addrstr; + struct timeval now; +cp + /* Estimate weight */ + + gettimeofday(&now, NULL); + c->estimated_weight = (now.tv_sec - c->start.tv_sec) * 1000 + (now.tv_usec - c->start.tv_usec) / 1000; + addrstr = address2str(c->address); + x = send_request(c, "%d %hd %s %d %d", ACK, myself->port, addrstr, c->estimated_weight, c->options); + free(addrstr); +cp + return x; +} + +void send_everything(connection_t *c) +{ + avl_node_t *node, *node2; + node_t *n; + subnet_t *s; + edge_t *e; + + /* Send all known subnets */ + + for(node = node_tree->head; node; node = node->next) + { + n = (node_t *)node->data; + + for(node2 = n->subnet_tree->head; node2; node2 = node2->next) + { + s = (subnet_t *)node2->data; + send_add_subnet(c, s); + } + } + + /* Send all known edges */ + + for(node = edge_tree->head; node; node = node->next) + { + e = (edge_t *)node->data; + + if(e == c->edge) + continue; + + send_add_edge(c, e); + } +} + +int ack_h(connection_t *c) +{ + port_t hisport; + char addrstr[MAX_STRING_SIZE]; + int weight; + int options; + node_t *n; + connection_t *other; + avl_node_t *node; +cp + if(sscanf(c->buffer, "%*d %hd "MAX_STRING" %d %d", &hisport, addrstr, &weight, &options) != 4) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ACK", c->name, c->hostname); + return -1; + } + + /* Check if we already have a node_t for him */ + + n = lookup_node(c->name); + + if(!n) + { + n = new_node(); + n->name = xstrdup(c->name); + n->address = c->address; + n->hostname = xstrdup(c->hostname); + n->port = hisport; + + /* FIXME: Also check if no other tinc daemon uses the same IP and port for UDP traffic */ + + node_add(n); + } + else + { + if(n->connection) + { + /* Oh dear, we already have a connection to this node. */ + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_DEBUG, _("Established a second connection with %s (%s), closing old connection"), n->name, n->hostname); + terminate_connection(n->connection, 0); + } + + /* FIXME: check if information in existing node matches that of the other end of this connection */ + } + + n->connection = c; + c->node = n; + c->options |= options; + + /* Create an edge_t for this connection */ + + c->edge = new_edge(); + + c->edge->from.node = myself; + c->edge->from.address = str2address(addrstr); + c->edge->from.port = myself->port; + c->edge->to.node = n; + c->edge->to.address = c->address; + c->edge->to.port = hisport; + c->edge->weight = (weight + c->estimated_weight) / 2; + c->edge->connection = c; + c->edge->options = c->options; + + edge_add(c->edge); + + /* Activate this connection */ + + c->allow_request = ALL; + c->status.active = 1; + + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_NOTICE, _("Connection with %s (%s) activated"), c->name, c->hostname); + +cp + /* Send him everything we know */ + + send_everything(c); + + /* Notify others of this connection */ + + for(node = connection_tree->head; node; node = node->next) + { + other = (connection_t *)node->data; + + if(other->status.active && other != c) + send_add_edge(other, c->edge); + } + + /* Run MST and SSSP algorithms */ + + graph(); + + /* Succesful connection, reset timeout if this is an outgoing connection. */ + + if(c->outgoing) + c->outgoing->timeout = 0; +cp + return 0; +} diff --git a/src/protocol_edge.c b/src/protocol_edge.c new file mode 100644 index 0000000..9c83199 --- /dev/null +++ b/src/protocol_edge.c @@ -0,0 +1,291 @@ +/* + protocol_edge.c -- handle the meta-protocol, edges + Copyright (C) 1999-2002 Ivo Timmermans , + 2000-2002 Guus Sliepen + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + + $Id: protocol_edge.c,v 1.1.4.1 2002/02/11 10:05:58 guus Exp $ +*/ + +#include "config.h" + +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include "conf.h" +#include "net.h" +#include "netutl.h" +#include "protocol.h" +#include "meta.h" +#include "connection.h" +#include "node.h" +#include "edge.h" +#include "graph.h" + +#include "system.h" + +int send_add_edge(connection_t *c, edge_t *e) +{ + int x; + char *from_addrstr, *to_addrstr; +cp + from_addrstr = address2str(e->from.address); + to_addrstr = address2str(e->to.address); + x = send_request(c, "%d %s %s %hd %s %s %hd %lx %d", ADD_EDGE, + e->from.node->name, from_addrstr, e->from.port, + e->to.node->name, to_addrstr, e->to.port, + e->options, e->weight); + free(from_addrstr); + free(to_addrstr); +cp + return x; +} + +int add_edge_h(connection_t *c) +{ + connection_t *other; + edge_t *e; + node_t *from, *to; + char from_name[MAX_STRING_SIZE]; + char to_name[MAX_STRING_SIZE]; + char from_addrstr[MAX_STRING_SIZE]; + char to_addrstr[MAX_STRING_SIZE]; + ipv4_t from_address, to_address; + port_t from_port, to_port; + long int options; + int weight; + avl_node_t *node; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING" %hd "MAX_STRING" "MAX_STRING" %hd %lx %d", + from_name, from_addrstr, &from_port, + to_name, to_addrstr, &to_port, + &options, &weight) != 8) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ADD_EDGE", c->name, c->hostname); + return -1; + } + + /* Check if names are valid */ + + if(check_id(from_name)) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_EDGE", c->name, c->hostname, _("invalid name")); + return -1; + } + + if(check_id(to_name)) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_EDGE", c->name, c->hostname, _("invalid name")); + return -1; + } + + /* Lookup nodes */ + + from = lookup_node(from_name); + + if(!from) + { + from = new_node(); + from->name = xstrdup(from_name); + node_add(from); + } + + to = lookup_node(to_name); + + if(!to) + { + to = new_node(); + to->name = xstrdup(to_name); + node_add(to); + } + + /* Convert addresses */ + + from_address = str2address(from_addrstr); + to_address = str2address(to_addrstr); + + /* Check if edge already exists */ + + e = lookup_edge(from, to); + + if(e) + { + if(e->weight != weight || e->options != options + || ((e->from.node == from) && (e->from.address != from_address || e->from.port != from_port || e->to.address != to_address || e->to.port != to_port)) + || ((e->from.node == to) && (e->from.address != to_address || e->from.port != to_port || e->to.address != from_address || e->to.port != from_port)) + ) + { + if(from == myself || to == myself) + { + if(debug_lvl >= DEBUG_PROTOCOL) + syslog(LOG_WARNING, _("Got %s from %s (%s) for ourself which does not match existing entry"), "ADD_EDGE", c->name, c->hostname); + send_add_edge(c, e); + return 0; + } + else + { + if(debug_lvl >= DEBUG_PROTOCOL) + syslog(LOG_WARNING, _("Got %s from %s (%s) which does not match existing entry"), "ADD_EDGE", c->name, c->hostname); + edge_del(e); + } + } + else + return 0; + } + else if(from == myself || to == myself) + { + if(debug_lvl >= DEBUG_PROTOCOL) + syslog(LOG_WARNING, _("Got %s from %s (%s) for ourself which does not exist"), "ADD_EDGE", c->name, c->hostname); + e = new_edge(); + e->from.node = from; + e->to.node = to; + send_del_edge(c, e); + free_edge(e); + return 0; + } + + + + e = new_edge(); + e->from.node = from; + e->from.address = from_address; + e->from.port = from_port; + e->to.node = to; + e->to.address = to_address; + e->to.port = to_port; + e->options = options; + e->weight = weight; + edge_add(e); + + /* Tell the rest about the new edge */ + + for(node = connection_tree->head; node; node = node->next) + { + other = (connection_t *)node->data; + if(other->status.active && other != c) + send_add_edge(other, e); + } + + /* Run MST before or after we tell the rest? */ + + graph(); +cp + return 0; +} + +int send_del_edge(connection_t *c, edge_t *e) +{ +cp + return send_request(c, "%d %s %s", DEL_EDGE, + e->from.node->name, e->to.node->name); +} + +int del_edge_h(connection_t *c) +{ + edge_t *e; + char from_name[MAX_STRING_SIZE]; + char to_name[MAX_STRING_SIZE]; + node_t *from, *to; + connection_t *other; + avl_node_t *node; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING"", from_name, to_name) != 2) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "DEL_EDGE", + c->name, c->hostname); + return -1; + } + + /* Check if names are valid */ + + if(check_id(from_name)) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name, c->hostname, _("invalid name")); + return -1; + } + + if(check_id(to_name)) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name, c->hostname, _("invalid name")); + return -1; + } + + /* Lookup nodes */ + + from = lookup_node(from_name); + + if(!from) + { + if(debug_lvl >= DEBUG_PROTOCOL) + syslog(LOG_ERR, _("Got %s from %s (%s) which does not appear in the edge tree"), "DEL_EDGE", c->name, c->hostname); + return 0; + } + + to = lookup_node(to_name); + + if(!to) + { + if(debug_lvl >= DEBUG_PROTOCOL) + syslog(LOG_ERR, _("Got %s from %s (%s) which does not appear in the edge tree"), "DEL_EDGE", c->name, c->hostname); + return 0; + } + + /* Check if edge exists */ + + e = lookup_edge(from, to); + + if(!e) + { + if(debug_lvl >= DEBUG_PROTOCOL) + syslog(LOG_WARNING, _("Got %s from %s (%s) which does not appear in the edge tree"), "DEL_EDGE", c->name, c->hostname); + return 0; + } + + if(e->from.node == myself || e->to.node == myself) + { + if(debug_lvl >= DEBUG_PROTOCOL) + syslog(LOG_WARNING, _("Got %s from %s (%s) for ourself"), "DEL_EDGE", c->name, c->hostname); + send_add_edge(c, e); /* Send back a correction */ + return 0; + } + + /* Tell the rest about the deleted edge */ + + for(node = connection_tree->head; node; node = node->next) + { + other = (connection_t *)node->data; + if(other->status.active && other != c) + send_del_edge(other, e); + } + + /* Delete the edge */ + + edge_del(e); + + /* Run MST before or after we tell the rest? */ + + graph(); +cp + return 0; +} diff --git a/src/protocol_key.c b/src/protocol_key.c new file mode 100644 index 0000000..3c72c29 --- /dev/null +++ b/src/protocol_key.c @@ -0,0 +1,272 @@ +/* + protocol_key.c -- handle the meta-protocol, key exchange + Copyright (C) 1999-2002 Ivo Timmermans , + 2000-2002 Guus Sliepen + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + + $Id: protocol_key.c,v 1.1.4.1 2002/02/11 10:05:58 guus Exp $ +*/ + +#include "config.h" + +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include "conf.h" +#include "net.h" +#include "netutl.h" +#include "protocol.h" +#include "meta.h" +#include "connection.h" +#include "node.h" +#include "edge.h" +\ +#include "system.h" + +int mykeyused = 0; + +int send_key_changed(connection_t *c, node_t *n) +{ + connection_t *other; + avl_node_t *node; +cp + /* Only send this message if some other daemon requested our key previously. + This reduces unnecessary key_changed broadcasts. + */ + + if(n == myself && !mykeyused) + return 0; + + for(node = connection_tree->head; node; node = node->next) + { + other = (connection_t *)node->data; + if(other->status.active && other->status.mst && other != c) + send_request(other, "%d %s", KEY_CHANGED, n->name); + } +cp + return 0; +} + +int key_changed_h(connection_t *c) +{ + char name[MAX_STRING_SIZE]; + node_t *n; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING, name) != 1) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "KEY_CHANGED", + c->name, c->hostname); + return -1; + } + + n = lookup_node(name); + + if(!n) + { + syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist"), "KEY_CHANGED", + c->name, c->hostname, name); + return -1; + } + + n->status.validkey = 0; + n->status.waitingforkey = 0; + n->sent_seqno = 0; + + send_key_changed(c, n); +cp + return 0; +} + +int send_req_key(connection_t *c, node_t *from, node_t *to) +{ +cp + return send_request(c, "%d %s %s", REQ_KEY, + from->name, to->name); +} + +int req_key_h(connection_t *c) +{ + char from_name[MAX_STRING_SIZE]; + char to_name[MAX_STRING_SIZE]; + node_t *from, *to; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING, from_name, to_name) != 2) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "REQ_KEY", + c->name, c->hostname); + return -1; + } + + from = lookup_node(from_name); + + if(!from) + { + syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"), "REQ_KEY", + c->name, c->hostname, from_name); + return -1; + } + + to = lookup_node(to_name); + + if(!to) + { + syslog(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"), "REQ_KEY", + c->name, c->hostname, to_name); + return -1; + } + + /* Check if this key request is for us */ + + if(to == myself) /* Yes, send our own key back */ + { + mykeyused = 1; + from->received_seqno = 0; + send_ans_key(c, myself, from); + } + else + { +/* Proxy keys + if(to->status.validkey) + { + send_ans_key(c, to, from); + } + else +*/ + send_req_key(to->nexthop->connection, from, to); + } + +cp + return 0; +} + +int send_ans_key(connection_t *c, node_t *from, node_t *to) +{ + char key[MAX_STRING_SIZE]; +cp + bin2hex(from->key, key, from->keylength); + key[from->keylength * 2] = '\0'; +cp + return send_request(c, "%d %s %s %s %d %d %d", ANS_KEY, + from->name, to->name, key, from->cipher?from->cipher->nid:0, from->digest?from->digest->type:0, from->maclength); +} + +int ans_key_h(connection_t *c) +{ + char from_name[MAX_STRING_SIZE]; + char to_name[MAX_STRING_SIZE]; + char key[MAX_STRING_SIZE]; + int cipher, digest, maclength; + node_t *from, *to; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING" "MAX_STRING" %d %d %d", from_name, to_name, key, &cipher, &digest, &maclength) != 6) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ANS_KEY", + c->name, c->hostname); + return -1; + } + + from = lookup_node(from_name); + + if(!from) + { + syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"), "ANS_KEY", + c->name, c->hostname, from_name); + return -1; + } + + to = lookup_node(to_name); + + if(!to) + { + syslog(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"), "ANS_KEY", + c->name, c->hostname, to_name); + return -1; + } + + /* Forward it if necessary */ + + if(to != myself) + { + return send_request(to->nexthop->connection, c->buffer); + } + + /* Update our copy of the origin's packet key */ + + if(from->key) + free(from->key); + + from->key = xstrdup(key); + from->keylength = strlen(key) / 2; + hex2bin(from->key, from->key, from->keylength); + from->key[from->keylength] = '\0'; + + from->status.validkey = 1; + from->status.waitingforkey = 0; + + /* Check and lookup cipher and digest algorithms */ + + if(cipher) + { + from->cipher = EVP_get_cipherbynid(cipher); + if(!from->cipher) + { + syslog(LOG_ERR, _("Node %s (%s) uses unknown cipher!"), from->name, from->hostname); + return -1; + } + if(from->keylength != from->cipher->key_len + from->cipher->iv_len) + { + syslog(LOG_ERR, _("Node %s (%s) uses wrong keylength!"), from->name, from->hostname); + return -1; + } + } + else + { + from->cipher = NULL; + } + + if(digest) + { + from->digest = EVP_get_digestbynid(digest); + if(!from->digest) + { + syslog(LOG_ERR, _("Node %s (%s) uses unknown digest!"), from->name, from->hostname); + return -1; + } + from->maclength = maclength; + if(from->maclength > from->digest->md_size || from->maclength < 0) + { + syslog(LOG_ERR, _("Node %s (%s) uses bogus MAC length!"), from->name, from->hostname); + return -1; + } + } + else + { + from->digest = NULL; + from->maclength = maclength; + } + + flush_queue(from); +cp + return 0; +} diff --git a/src/protocol_misc.c b/src/protocol_misc.c new file mode 100644 index 0000000..5863f9e --- /dev/null +++ b/src/protocol_misc.c @@ -0,0 +1,193 @@ +/* + protocol_misc.c -- handle the meta-protocol, miscellaneous functions + Copyright (C) 1999-2002 Ivo Timmermans , + 2000-2002 Guus Sliepen + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + + $Id: protocol_misc.c,v 1.1.4.1 2002/02/11 10:05:58 guus Exp $ +*/ + +#include "config.h" + +#include +#include +#include +#include +#include +#include + +#include + +#include "conf.h" +#include "net.h" +#include "netutl.h" +#include "protocol.h" +#include "meta.h" +#include "connection.h" + +#include "system.h" + +/* Status and error notification routines */ + +int send_status(connection_t *c, int statusno, char *statusstring) +{ +cp + if(!statusstring) + statusstring = status_text[statusno]; +cp + return send_request(c, "%d %d %s", STATUS, statusno, statusstring); +} + +int status_h(connection_t *c) +{ + int statusno; + char statusstring[MAX_STRING_SIZE]; +cp + if(sscanf(c->buffer, "%*d %d "MAX_STRING, &statusno, statusstring) != 2) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "STATUS", + c->name, c->hostname); + return -1; + } + + if(debug_lvl >= DEBUG_STATUS) + { + syslog(LOG_NOTICE, _("Status message from %s (%s): %s: %s"), + c->name, c->hostname, status_text[statusno], statusstring); + } + +cp + return 0; +} + +int send_error(connection_t *c, int err, char *errstring) +{ +cp + if(!errstring) + errstring = strerror(err); + return send_request(c, "%d %d %s", ERROR, err, errstring); +} + +int error_h(connection_t *c) +{ + int err; + char errorstring[MAX_STRING_SIZE]; +cp + if(sscanf(c->buffer, "%*d %d "MAX_STRING, &err, errorstring) != 2) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ERROR", + c->name, c->hostname); + return -1; + } + + if(debug_lvl >= DEBUG_ERROR) + { + syslog(LOG_NOTICE, _("Error message from %s (%s): %s: %s"), + c->name, c->hostname, strerror(err), errorstring); + } + + terminate_connection(c, c->status.active); +cp + return 0; +} + +int send_termreq(connection_t *c) +{ +cp + return send_request(c, "%d", TERMREQ); +} + +int termreq_h(connection_t *c) +{ +cp + terminate_connection(c, c->status.active); +cp + return 0; +} + +int send_ping(connection_t *c) +{ +cp + c->status.pinged = 1; + c->last_ping_time = time(NULL); +cp + return send_request(c, "%d", PING); +} + +int ping_h(connection_t *c) +{ +cp + return send_pong(c); +} + +int send_pong(connection_t *c) +{ +cp + return send_request(c, "%d", PONG); +} + +int pong_h(connection_t *c) +{ +cp + c->status.pinged = 0; +cp + return 0; +} + +/* Sending and receiving packets via TCP */ + +int send_tcppacket(connection_t *c, vpn_packet_t *packet) +{ + int x; +cp + /* Evil hack. */ + + x = send_request(c, "%d %hd", PACKET, packet->len); + + if(x) + return x; +cp + return send_meta(c, packet->data, packet->len); +} + +int tcppacket_h(connection_t *c) +{ + short int len; +cp + if(sscanf(c->buffer, "%*d %hd", &len) != 1) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "PACKET", c->name, c->hostname); + return -1; + } + + /* Set reqlen to len, this will tell receive_meta() that a tcppacket is coming. */ + + c->tcplen = len; +cp + return 0; +} + +/* Status strings */ + +char (*status_text[]) = { + "Warning", +}; + +/* Error strings */ + +char (*error_text[]) = { + "Error", +}; diff --git a/src/protocol_subnet.c b/src/protocol_subnet.c new file mode 100644 index 0000000..fbb021d --- /dev/null +++ b/src/protocol_subnet.c @@ -0,0 +1,231 @@ +/* + protocol_subnet.c -- handle the meta-protocol, subnets + Copyright (C) 1999-2002 Ivo Timmermans , + 2000-2002 Guus Sliepen + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + + $Id: protocol_subnet.c,v 1.1.4.1 2002/02/11 10:05:58 guus Exp $ +*/ + +#include "config.h" + +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include "conf.h" +#include "net.h" +#include "netutl.h" +#include "protocol.h" +#include "meta.h" +#include "connection.h" +#include "node.h" +#include "edge.h" +#include "graph.h" + +#include "system.h" + +int send_add_subnet(connection_t *c, subnet_t *subnet) +{ + int x; + char *netstr; +cp + x = send_request(c, "%d %s %s", ADD_SUBNET, + subnet->owner->name, netstr = net2str(subnet)); + free(netstr); +cp + return x; +} + +int add_subnet_h(connection_t *c) +{ + char subnetstr[MAX_STRING_SIZE]; + char name[MAX_STRING_SIZE]; + node_t *owner; + connection_t *other; + subnet_t *s; + avl_node_t *node; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING, name, subnetstr) != 2) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ADD_SUBNET", c->name, c->hostname); + return -1; + } + + /* Check if owner name is a valid */ + + if(check_id(name)) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_SUBNET", c->name, c->hostname, _("invalid name")); + return -1; + } + + /* Check if subnet string is valid */ + + if(!(s = str2net(subnetstr))) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_SUBNET", c->name, c->hostname, _("invalid subnet string")); + return -1; + } + + /* Check if the owner of the new subnet is in the connection list */ + + owner = lookup_node(name); + + if(!owner) + { + owner = new_node(); + owner->name = xstrdup(name); + node_add(owner); + } + + /* Check if we already know this subnet */ + + if(lookup_subnet(owner, s)) + { + free_subnet(s); + return 0; + } + + /* If we don't know this subnet, but we are the owner, retaliate with a DEL_SUBNET */ + + if(owner == myself) + { + if(debug_lvl >= DEBUG_PROTOCOL) + syslog(LOG_WARNING, _("Got %s from %s (%s) for ourself"), "ADD_SUBNET", c->name, c->hostname); + s->owner = myself; + send_del_subnet(c, s); + return 0; + } + + /* If everything is correct, add the subnet to the list of the owner */ + + subnet_add(owner, s); + + /* Tell the rest */ + + for(node = connection_tree->head; node; node = node->next) + { + other = (connection_t *)node->data; + if(other->status.active && other != c) + send_add_subnet(other, s); + } +cp + return 0; +} + +int send_del_subnet(connection_t *c, subnet_t *s) +{ + int x; + char *netstr; +cp + netstr = net2str(s); + x = send_request(c, "%d %s %s", DEL_SUBNET, s->owner->name, netstr); + free(netstr); +cp + return x; +} + +int del_subnet_h(connection_t *c) +{ + char subnetstr[MAX_STRING_SIZE]; + char name[MAX_STRING_SIZE]; + node_t *owner; + connection_t *other; + subnet_t *s, *find; + avl_node_t *node; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING, name, subnetstr) != 2) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "DEL_SUBNET", c->name, c->hostname); + return -1; + } + + /* Check if owner name is a valid */ + + if(check_id(name)) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_SUBNET", c->name, c->hostname, _("invalid name")); + return -1; + } + + /* Check if the owner of the new subnet is in the connection list */ + + if(!(owner = lookup_node(name))) + { + if(debug_lvl >= DEBUG_PROTOCOL) + syslog(LOG_WARNING, _("Got %s from %s (%s) for %s which is not in our node tree"), + "DEL_SUBNET", c->name, c->hostname, name); + return 0; + } + + /* Check if subnet string is valid */ + + if(!(s = str2net(subnetstr))) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_SUBNET", c->name, c->hostname, _("invalid subnet string")); + return -1; + } + + /* If everything is correct, delete the subnet from the list of the owner */ + + s->owner = owner; + + find = lookup_subnet(owner, s); + + free_subnet(s); + + if(!find) + { + if(debug_lvl >= DEBUG_PROTOCOL) + syslog(LOG_WARNING, _("Got %s from %s (%s) for %s which does not appear in his subnet tree"), + "DEL_SUBNET", c->name, c->hostname, name); + return 0; + } + + /* If we are the owner of this subnet, retaliate with an ADD_SUBNET */ + + if(owner == myself) + { + if(debug_lvl >= DEBUG_PROTOCOL) + syslog(LOG_WARNING, _("Got %s from %s (%s) for ourself"), "DEL_SUBNET", c->name, c->hostname); + send_add_subnet(c, find); + return 0; + } + + /* Tell the rest */ + + for(node = connection_tree->head; node; node = node->next) + { + other = (connection_t *)node->data; + if(other->status.active && other != c) + send_del_subnet(other, find); + } + + /* Finally, delete it. */ + + subnet_del(owner, find); + +cp + return 0; +} -- 2.25.1