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Sourcecode: ipsec-tools version File versions

rsalist.c

/* $Id: rsalist.c,v 1.3 2004/11/08 12:04:23 ludvigm Exp $ */

/*
 * Copyright (C) 2004 SuSE Linux AG, Nuernberg, Germany.
 * Contributed by: Michal Ludvig <mludvig@suse.cz>, SUSE Labs
 * 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. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``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 PROJECT OR CONTRIBUTORS 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.
 */

#include "config.h"

#include <stdio.h>
#include <string.h>

#include <sys/types.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <netdb.h>

#include <openssl/bn.h>
#include <openssl/rsa.h>

#include "misc.h"
#include "plog.h"
#include "sockmisc.h"
#include "rsalist.h"
#include "genlist.h"
#include "remoteconf.h"
#include "crypto_openssl.h"

#ifndef LIST_FIRST
#define LIST_FIRST(head)        ((head)->lh_first)
#endif

#ifndef LIST_NEXT
#define LIST_NEXT(elm, field)   ((elm)->field.le_next)
#endif

/* from prsa_tok.l */
int prsa_parse_file(struct genlist *list, const char *fname, enum rsa_key_type type);

int
rsa_key_insert(struct genlist *list, struct netaddr *src,
             struct netaddr *dst, RSA *rsa)
{
      struct rsa_key *rsa_key;

      rsa_key = calloc(sizeof(struct rsa_key), 1);
      rsa_key->rsa = rsa;

      if (src)
            rsa_key->src = src;
      else
            rsa_key->src = calloc(sizeof(*rsa_key->src), 1);

      if (dst)
            rsa_key->dst = dst;
      else
            rsa_key->dst = calloc(sizeof(*rsa_key->dst), 1);

      genlist_append(list, rsa_key);

      return 0;
}

static void *
rsa_key_dump_one(void *entry, void *arg)
{
      struct rsa_key *key = entry;

      plog(LLV_DEBUG, LOCATION, NULL, "Entry %s\n",
           naddrwop2str_fromto("%s -> %s", key->src,
                         key->dst));
      if (loglevel > LLV_DEBUG)
            RSA_print_fp(stdout, key->rsa, 4);

      return NULL;
}

void
rsa_key_dump(struct genlist *list)
{
      genlist_foreach(list, rsa_key_dump_one, NULL);
}

static void *
rsa_list_count_one(void *entry, void *arg)
{
      if (arg)
            (*(unsigned long *)arg)++;
      return NULL;
}

unsigned long
rsa_list_count(struct genlist *list)
{
      unsigned long count = 0;
      genlist_foreach(list, rsa_list_count_one, &count);
      return count;
}

struct lookup_result {
      struct ph1handle *iph1;
      int max_score;
      struct genlist *winners;
};
      
static void *
rsa_lookup_key_one(void *entry, void *data)
{
      int local_score, remote_score;
      struct lookup_result *req = data;
      struct rsa_key *key = entry;

      local_score = naddr_score(key->src, req->iph1->local);
      remote_score = naddr_score(key->dst, req->iph1->remote);

      plog(LLV_DEBUG, LOCATION, NULL, "Entry %s scored %d/%d\n",
            naddrwop2str_fromto("%s -> %s", key->src, key->dst),
            local_score, remote_score);

      if (local_score >= 0 && remote_score >= 0) {
            if (local_score + remote_score > req->max_score) {
                  req->max_score = local_score + remote_score;
//                genlist_free(req->winners, NULL);
            }

            if (local_score + remote_score >= req->max_score) {
                  genlist_append(req->winners, key);
            }
      }

      /* Always traverse the whole list */
      return NULL;
}

struct genlist *
rsa_lookup_keys(struct ph1handle *iph1, int my)
{
      struct genlist *list;
      struct lookup_result r;

      plog(LLV_DEBUG, LOCATION, NULL, "Looking up RSA key for %s\n",
           saddr2str_fromto("%s <-> %s", iph1->local, iph1->remote));

      r.iph1 = iph1;
      r.max_score = -1;
      r.winners = genlist_init();

      if (my)
            list = iph1->rmconf->rsa_private;
      else
            list = iph1->rmconf->rsa_public;

      genlist_foreach(list, rsa_lookup_key_one, &r);

      if (loglevel >= LLV_DEBUG)
            rsa_key_dump(r.winners);

      return r.winners;
}

int
rsa_parse_file(struct genlist *list, const char *fname, enum rsa_key_type type)
{
      int ret;
      
      plog(LLV_DEBUG, LOCATION, NULL, "Parsing %s\n", fname);
      ret = prsa_parse_file(list, fname, type);
      if (loglevel >= LLV_DEBUG)
            rsa_key_dump(list);
      return ret;
}

RSA *
rsa_try_check_rsasign(vchar_t *source, vchar_t *sig, struct genlist *list)
{
      struct rsa_key *key;
      struct genlist_entry *gp;

      for(key = genlist_next(list, &gp); key; key = genlist_next(NULL, &gp)) {
            plog(LLV_DEBUG, LOCATION, NULL, "Checking key %s...\n",
                  naddrwop2str_fromto("%s -> %s", key->src, key->dst));
            if (eay_check_rsasign(source, sig, key->rsa) == 0) {
                  plog(LLV_DEBUG, LOCATION, NULL, " ... YEAH!\n");
                  return key->rsa;
            }
            plog(LLV_DEBUG, LOCATION, NULL, " ... nope.\n");
      }
      return NULL;
}

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