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Diffstat (limited to 'sbin/ipsec/photurisd/handle_identity_request.c')
-rw-r--r--sbin/ipsec/photurisd/handle_identity_request.c323
1 files changed, 323 insertions, 0 deletions
diff --git a/sbin/ipsec/photurisd/handle_identity_request.c b/sbin/ipsec/photurisd/handle_identity_request.c
new file mode 100644
index 00000000000..145594eaf5f
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+++ b/sbin/ipsec/photurisd/handle_identity_request.c
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+/*
+ * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by Niels Provos.
+ * 4. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+/*
+ * handle_identity_request:
+ * receive a IDENTITY_REQUEST packet; return -1 on failure, 0 on success
+ *
+ */
+
+#ifndef lint
+static char rcsid[] = "$Id: handle_identity_request.c,v 1.1 1997/07/18 22:48:50 provos Exp $";
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "config.h"
+#include "photuris.h"
+#include "packets.h"
+#include "state.h"
+#include "cookie.h"
+#include "buffer.h"
+#include "packet.h"
+#include "encrypt.h"
+#include "identity.h"
+#include "spi.h"
+#include "secrets.h"
+#include "scheme.h"
+#include "errlog.h"
+#include "schedule.h"
+#ifdef IPSEC
+#include "kernel.h"
+#endif
+
+int
+handle_identity_request(u_char *packet, int size, char *address,
+ char *local_address)
+{
+ struct identity_message *header;
+ struct stateob *st;
+ struct spiob *spi;
+ u_int8_t *p, *attributes;
+ u_int16_t i, asize, attribsize, tmp;
+ u_int8_t signature[22]; /* XXX - constant */
+
+ if (size < IDENTITY_MESSAGE_MIN)
+ return -1; /* packet too small */
+
+ header = (struct identity_message *) packet;
+
+ st = state_find_cookies(address, header->icookie, header->rcookie);
+ if (st == NULL) {
+ packet_size = PACKET_BUFFER_SIZE;
+ photuris_error_message(st, packet_buffer, &packet_size,
+ header->icookie, header->rcookie,
+ 0, BAD_COOKIE);
+ send_packet();
+ return 0;
+ }
+
+ if (st->phase != VALUE_RESPONSE && st->phase != SPI_UPDATE)
+ return -1; /* We don't want this packet */
+
+ /* Decrypt message */
+ tmp = size - IDENTITY_MESSAGE_MIN;
+ if (packet_decrypt(st, IDENTITY_MESSAGE_CHOICE(header), &tmp) == -1) {
+ log_error(0, "packet_decrypt() in handle_identity_request()");
+ packet_size = PACKET_BUFFER_SIZE;
+ photuris_error_message(st, packet_buffer, &packet_size,
+ header->icookie, header->rcookie,
+ 0, VERIFICATION_FAILURE);
+ send_packet();
+ return -1;
+ }
+
+ /* Verify message */
+ if (!(i = get_identity_verification_size(st, IDENTITY_MESSAGE_CHOICE(header)))) {
+ packet_size = PACKET_BUFFER_SIZE;
+ photuris_error_message(st, packet_buffer, &packet_size,
+ header->icookie, header->rcookie,
+ 0, VERIFICATION_FAILURE);
+ send_packet();
+ return -1;
+ }
+
+ asize = IDENTITY_MESSAGE_MIN;
+
+ p = IDENTITY_MESSAGE_CHOICE(header);
+ asize += p[1] + 2;
+ p += p[1] + 2;
+ asize += varpre2octets(p);
+ p += varpre2octets(p);
+
+ attributes = p + i;
+ asize += i; /* Verification size */
+ asize += packet[size-1]; /* Padding size */
+ attribsize = 0;
+ while(asize + attribsize < size)
+ attribsize += attributes[attribsize+1] + 2;
+
+ asize += attribsize;
+
+ if (asize != size) {
+ log_error(0, "wrong packet size in handle_identity_request()");
+ return -1;
+ }
+
+ if (i > sizeof(signature)) {
+ log_error(0, "verification too long in handle_identity_request()");
+ packet_size = PACKET_BUFFER_SIZE;
+ photuris_error_message(st, packet_buffer, &packet_size,
+ header->icookie, header->rcookie,
+ 0, VERIFICATION_FAILURE);
+ send_packet();
+ return -1;
+ }
+
+ bcopy(p, signature, i);
+ bzero(p, i);
+
+ if (st->phase == VALUE_RESPONSE) {
+ /* Fill the state object, but only if we have not dont so before */
+ if (st->uSPIidentver == NULL) {
+ if((st->uSPIidentver = calloc(i, sizeof(u_int8_t))) == NULL) {
+ log_error(1, "calloc() in handle_identity_request()");
+ return -1;
+ }
+ bcopy(signature, st->uSPIidentver, i);
+ st->uSPIidentversize = i;
+ }
+
+ p = IDENTITY_MESSAGE_CHOICE(header);
+ if (st->uSPIidentchoice == NULL) {
+ if((st->uSPIidentchoice = calloc(p[1]+2, sizeof(u_int8_t))) == NULL) {
+ log_error(1, "calloc() in handle_identity_request()");
+ return -1;
+ }
+ bcopy(p, st->uSPIidentchoice, p[1]+2);
+ st->uSPIidentchoicesize = p[1]+2;
+ }
+
+ p += p[1] + 2;
+ if (st->uSPIident == NULL) {
+ if((st->uSPIident = calloc(varpre2octets(p), sizeof(u_int8_t))) == NULL) {
+ log_error(1,"calloc() in handle_identity_request()");
+ return -1;
+ }
+ bcopy(p, st->uSPIident, varpre2octets(p));
+ }
+
+ if (st->uSPIattrib == NULL) {
+ if((st->uSPIattrib = calloc(attribsize, sizeof(u_int8_t))) == NULL) {
+ log_error(1, "calloc() in handle_identity_request()");
+ return -1;
+ }
+ bcopy(attributes, st->uSPIattrib, attribsize);
+ st->uSPIattribsize = attribsize;
+ }
+
+ if (st->oSPIident == NULL &&
+ get_secrets(st, (ID_REMOTE|ID_LOCAL)) == -1) {
+ log_error(0, "get_secrets() in in handle_identity_request()");
+ return -1;
+ }
+
+ }
+
+ if (!verify_identity_verification(st, signature, packet, size)) {
+ if (st->phase != SPI_UPDATE) {
+ /*
+ * Clean up everything used from this packet
+ * but only if we did not get a valid packet before.
+ * Otherwise this could be used as Denial of Service.
+ */
+ free(st->uSPIidentchoice);
+ st->uSPIidentchoice = NULL; st->uSPIidentchoicesize = 0;
+ free(st->uSPIidentver);
+ st->uSPIidentver = NULL; st->uSPIidentversize = 0;
+ free(st->uSPIattrib);
+ st->uSPIattrib = NULL; st->uSPIattribsize = 0;
+ free(st->uSPIident);
+ st->uSPIident = NULL;
+ free(st->oSPIident);
+ st->oSPIident = NULL;
+
+ /* Clean up secrets */
+ free(st->oSPIsecret);
+ st->oSPIsecret = NULL; st->oSPIsecretsize = 0;
+ free(st->uSPIsecret);
+ st->uSPIsecret = NULL; st->uSPIsecretsize = 0;
+ }
+
+ log_error(0, "verification failed in handle_identity_request()");
+ packet_size = PACKET_BUFFER_SIZE;
+ photuris_error_message(st, packet_buffer, &packet_size,
+ header->icookie, header->rcookie,
+ 0, VERIFICATION_FAILURE);
+ send_packet();
+ return 0;
+ }
+
+ if (st->phase != VALUE_RESPONSE) {
+ /* We got send the old packet again */
+ bcopy(st->packet, packet_buffer, st->packetlen);
+ packet_size = st->packetlen;
+
+ send_packet();
+ return 0;
+ }
+
+ /* Create SPI + choice of attributes */
+ if(make_spi(st, local_address, st->oSPI, &(st->olifetime),
+ &(st->oSPIattrib), &(st->oSPIattribsize)) == -1) {
+ log_error(0, "make_spi() in handle_identity_request()");
+ return -1;
+ }
+
+ packet_size = PACKET_BUFFER_SIZE;
+ if (photuris_identity_response(st, packet_buffer, &packet_size) == -1)
+ return -1;
+
+ send_packet();
+
+ packet_save(st, packet_buffer, packet_size);
+
+ bcopy(header->SPI, st->uSPI, SPI_SIZE);
+ st->ulifetime = (header->lifetime[0] << 16) +
+ (header->lifetime[1] << 8) + header->lifetime[2];
+
+ if (st->oSPI[0] || st->oSPI[1] || st->oSPI[2] || st->oSPI[3]) {
+ /* Insert Owner SPI */
+ if ((spi = spi_new(st->address, st->oSPI)) == NULL) {
+ log_error(0, "spi_new() in handle_identity_request()");
+ return -1;
+ }
+ if ((spi->local_address = strdup(local_address)) == NULL) {
+ log_error(0, "strdup() in handle_identity_request()");
+ return -1;
+ }
+ bcopy(st->icookie, spi->icookie, COOKIE_SIZE);
+ spi->owner = 1;
+ spi->attribsize = st->oSPIattribsize;
+ spi->attributes = calloc(spi->attribsize, sizeof(u_int8_t));
+ if (spi->attributes == NULL) {
+ log_error(1, "calloc() in handle_identity_request()");
+ spi_value_reset(spi);
+ return -1;
+ }
+ bcopy(st->oSPIattrib, spi->attributes, spi->attribsize);
+ spi->lifetime = time(NULL) + st->olifetime;
+
+ /* Make session keys for Owner */
+ make_session_keys(st, spi);
+
+ spi_insert(spi);
+#ifdef IPSEC
+ kernel_insert_spi(spi);
+#endif
+ schedule_insert(UPDATE, st->olifetime/2, spi->SPI, SPI_SIZE);
+ }
+
+ if (st->uSPI[0] || st->uSPI[1] || st->uSPI[2] || st->uSPI[3]) {
+ /* Insert User SPI */
+ if ((spi = spi_new(st->address, st->uSPI)) == NULL) {
+ log_error(0, "spi_new() in handle_identity_request()");
+ return -1;
+ }
+ if ((spi->local_address = strdup(local_address)) == NULL) {
+ log_error(1, "strdup() in handle_identity_request()");
+ return -1;
+ }
+ bcopy(st->icookie, spi->icookie, COOKIE_SIZE);
+ spi->attribsize = st->uSPIattribsize;
+ spi->attributes = calloc(spi->attribsize, sizeof(u_int8_t));
+ if (spi->attributes == NULL) {
+ log_error(1, "calloc() in handle_identity_request()");
+ spi_value_reset(spi);
+ return -1;
+ }
+ bcopy(st->uSPIattrib, spi->attributes, spi->attribsize);
+ spi->lifetime = time(NULL) + st->ulifetime;
+
+ /* Make session keys for User */
+ make_session_keys(st, spi);
+
+ spi_insert(spi);
+#ifdef IPSEC
+ kernel_insert_spi(spi);
+#endif
+ }
+
+ st->lifetime = exchange_lifetime + time(NULL) + random() % 20;
+
+ st->retries = 0;
+ st->phase = SPI_UPDATE;
+ return 0;
+}
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