trunk/src/rsa.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  rsa.c: Functions for use with RSA public key cryptography.
 *
 *  Copyright (C) 2002 by the past and present ircd coders, and others.
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *  USA
 *
 *  $Id$
 */

#include "stdinc.h"

#include <openssl/pem.h>
#include <openssl/rand.h>
#include <openssl/rsa.h>
#include <openssl/md5.h>
#include <openssl/bn.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/opensslv.h>

#include "memory.h"
#include "rsa.h"
#include "s_conf.h"
#include "s_log.h"
#include "client.h" /* CIPHERKEYLEN .. eww */
#include "ircd.h" /* bio_spare_fd */


/*
 * report_crypto_errors - Dump crypto error list to log
 */
void
report_crypto_errors(void)
{
  unsigned long e   = 0;
  unsigned long cnt = 0;

  ERR_load_crypto_strings();

  while ((cnt < 100) && (e = ERR_get_error()))
  {
    ilog(L_CRIT, "SSL error: %s", ERR_error_string(e, 0));
    cnt++;
  }
}

/*
 * verify_private_key - reread private key and verify against inmem key
 */
int
verify_private_key(void)
{
  BIO *file;
  RSA *key;
  RSA *mkey;

  /* If the rsa_private_key directive isn't found, error out. */
  if (ServerInfo.rsa_private_key == NULL)
  {
    ilog(L_NOTICE, "rsa_private_key in serverinfo{} is not defined.");
    return -1;
  }

  /* If rsa_private_key_file isn't available, error out. */
  if (ServerInfo.rsa_private_key_file == NULL)
  {
    ilog(L_NOTICE, "Internal error: rsa_private_key_file isn't defined.");
    return -1;
  }

  if (bio_spare_fd > -1)
    close(bio_spare_fd);

  file = BIO_new_file(ServerInfo.rsa_private_key_file, "r");

  /*
   * If BIO_new_file returned NULL (according to OpenSSL docs), then
   * an error occurred.
   */
  if (file == NULL)
  {
    bio_spare_fd = save_spare_fd("SSL private key validation");
    ilog(L_NOTICE, "Failed to open private key file - can't validate it");
    return -1;
  }

  /*
   * jdc -- Let's do this a little differently.  According to the
   *        OpenSSL documentation, you need to METHOD_free(key) before
   *        assigning it.  Don't believe me?  Check out the following
   *        URL:  http://www.openssl.org/docs/crypto/pem.html#BUGS
   * P.S. -- I have no idea why the key= assignment has to be typecasted.
   *         For some reason the system thinks PEM_read_bio_RSAPrivateKey
   *         is returning an int, not a RSA *.
   * androsyn -- Thats because you didn't have a prototype and including
   *             pem.h breaks things for some reason..
   */
  key = (RSA *) PEM_read_bio_RSAPrivateKey(file, NULL, 0, NULL);

  if (key == NULL)
  {
    ilog(L_NOTICE, "PEM_read_bio_RSAPrivateKey() failed; possibly not RSA?");
    report_crypto_errors();
    return -1;
  }

  BIO_set_close(file, BIO_CLOSE);
  BIO_free(file);
  bio_spare_fd = save_spare_fd("SSL private key validation");

  mkey = ServerInfo.rsa_private_key;

  /*
   * Compare the in-memory key to the key we just loaded above.  If
   * any of the portions don't match, then logically we have a different
   * in-memory key vs. the one we just loaded.  This is bad, mmmkay?
   */
  if (mkey->pad != key->pad)
    ilog(L_CRIT, "Private key corrupted: pad %i != pad %i",
                 mkey->pad, key->pad);
  
  if (mkey->version != key->version)
    ilog(L_CRIT, "Private key corrupted: version %li != version %li",
                 mkey->version, key->version);

  if (BN_cmp(mkey->n, key->n))
    ilog(L_CRIT, "Private key corrupted: n differs");
  if (BN_cmp(mkey->e, key->e))
    ilog(L_CRIT, "Private key corrupted: e differs");
  if (BN_cmp(mkey->d, key->d))
    ilog(L_CRIT, "Private key corrupted: d differs");
  if (BN_cmp(mkey->p, key->p))
    ilog(L_CRIT, "Private key corrupted: p differs");
  if (BN_cmp(mkey->q, key->q))
    ilog(L_CRIT, "Private key corrupted: q differs");
  if (BN_cmp(mkey->dmp1, key->dmp1))
    ilog(L_CRIT, "Private key corrupted: dmp1 differs");
  if (BN_cmp(mkey->dmq1, key->dmq1))
    ilog(L_CRIT, "Private key corrupted: dmq1 differs");
  if (BN_cmp(mkey->iqmp, key->iqmp))
    ilog(L_CRIT, "Private key corrupted: iqmp differs");

  RSA_free(key);
  return 0;
}


static void
binary_to_hex(unsigned char *bin, char *hex, int length)
{
  static const char trans[] = "0123456789ABCDEF";
  int i;

  for (i = 0; i < length; i++)
  {
    hex[i  << 1]      = trans[bin[i] >> 4];
    hex[(i << 1) + 1] = trans[bin[i] & 0xf];
  }

  hex[i << 1] = '\0';
}

int
get_randomness(unsigned char *buf, int length)
{
    /* Seed OpenSSL PRNG with EGD enthropy pool -kre */
    if (ConfigFileEntry.use_egd &&
        (ConfigFileEntry.egdpool_path != NULL))
    {
      if (RAND_egd(ConfigFileEntry.egdpool_path) == -1)
            return -1;
    }

  if (RAND_status())
    return (RAND_bytes(buf, length));
  else /* XXX - abort? */
    return (RAND_pseudo_bytes(buf, length));
}

int
generate_challenge(char **r_challenge, char **r_response, RSA *rsa)
{
  unsigned char secret[32], *tmp;
  unsigned long length;
  int ret = -1;

  if (!rsa)
        return -1;
  get_randomness(secret, 32);
  *r_response = MyMalloc(65);
  binary_to_hex(secret, *r_response, 32);

  length = RSA_size(rsa);
  tmp = MyMalloc(length);
  ret = RSA_public_encrypt(32, secret, tmp, rsa, RSA_PKCS1_PADDING);

  *r_challenge = MyMalloc((length << 1) + 1);
  binary_to_hex( tmp, *r_challenge, length);
  (*r_challenge)[length<<1] = 0;
  MyFree(tmp);

  if (ret < 0)
  {
    report_crypto_errors();
    return -1;
  }
  return 0;
}
Revision:	1015
Committed:	Sun Oct 25 00:08:06 2009 UTC (16 years, 11 months ago) by michael
Content type:	text/x-csrc
Original Path:	*ircd-hybrid-7.2/src/rsa.c*
File size:	6139 byte(s)
Log Message:	- fixed broken cryptlinks as reported by henri - removed deprecated inet_misc.c - removed __attribute__ format, which sometimes really is usefull, even if unportable unless gcc, but for now they only give false warnings
#	Content
1	/*
2	* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3	* rsa.c: Functions for use with RSA public key cryptography.
4	*
5	* Copyright (C) 2002 by the past and present ircd coders, and others.
6	*
7	* This program is free software; you can redistribute it and/or modify
8	* it under the terms of the GNU General Public License as published by
9	* the Free Software Foundation; either version 2 of the License, or
10	* (at your option) any later version.
11	*
12	* This program is distributed in the hope that it will be useful,
13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15	* GNU General Public License for more details.
16	*
17	* You should have received a copy of the GNU General Public License
18	* along with this program; if not, write to the Free Software
19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20	* USA
21	*
22	* $Id$
23	*/
24
25	#include "stdinc.h"
26
27	#include <openssl/pem.h>
28	#include <openssl/rand.h>
29	#include <openssl/rsa.h>
30	#include <openssl/md5.h>
31	#include <openssl/bn.h>
32	#include <openssl/evp.h>
33	#include <openssl/err.h>
34	#include <openssl/opensslv.h>
35
36	#include "memory.h"
37	#include "rsa.h"
38	#include "s_conf.h"
39	#include "s_log.h"
40	#include "client.h" /* CIPHERKEYLEN .. eww */
41	#include "ircd.h" /* bio_spare_fd */
42
43
44	/*
45	* report_crypto_errors - Dump crypto error list to log
46	*/
47	void
48	report_crypto_errors(void)
49	{
50	unsigned long e = 0;
51	unsigned long cnt = 0;
52
53	ERR_load_crypto_strings();
54
55	while ((cnt < 100) && (e = ERR_get_error()))
56	{
57	ilog(L_CRIT, "SSL error: %s", ERR_error_string(e, 0));
58	cnt++;
59	}
60	}
61
62	/*
63	* verify_private_key - reread private key and verify against inmem key
64	*/
65	int
66	verify_private_key(void)
67	{
68	BIO *file;
69	RSA *key;
70	RSA *mkey;
71
72	/* If the rsa_private_key directive isn't found, error out. */
73	if (ServerInfo.rsa_private_key == NULL)
74	{
75	ilog(L_NOTICE, "rsa_private_key in serverinfo{} is not defined.");
76	return -1;
77	}
78
79	/* If rsa_private_key_file isn't available, error out. */
80	if (ServerInfo.rsa_private_key_file == NULL)
81	{
82	ilog(L_NOTICE, "Internal error: rsa_private_key_file isn't defined.");
83	return -1;
84	}
85
86	if (bio_spare_fd > -1)
87	close(bio_spare_fd);
88
89	file = BIO_new_file(ServerInfo.rsa_private_key_file, "r");
90
91	/*
92	* If BIO_new_file returned NULL (according to OpenSSL docs), then
93	* an error occurred.
94	*/
95	if (file == NULL)
96	{
97	bio_spare_fd = save_spare_fd("SSL private key validation");
98	ilog(L_NOTICE, "Failed to open private key file - can't validate it");
99	return -1;
100	}
101
102	/*
103	* jdc -- Let's do this a little differently. According to the
104	* OpenSSL documentation, you need to METHOD_free(key) before
105	* assigning it. Don't believe me? Check out the following
106	* URL: http://www.openssl.org/docs/crypto/pem.html#BUGS
107	* P.S. -- I have no idea why the key= assignment has to be typecasted.
108	* For some reason the system thinks PEM_read_bio_RSAPrivateKey
109	* is returning an int, not a RSA *.
110	* androsyn -- Thats because you didn't have a prototype and including
111	* pem.h breaks things for some reason..
112	*/
113	key = (RSA *) PEM_read_bio_RSAPrivateKey(file, NULL, 0, NULL);
114
115	if (key == NULL)
116	{
117	ilog(L_NOTICE, "PEM_read_bio_RSAPrivateKey() failed; possibly not RSA?");
118	report_crypto_errors();
119	return -1;
120	}
121
122	BIO_set_close(file, BIO_CLOSE);
123	BIO_free(file);
124	bio_spare_fd = save_spare_fd("SSL private key validation");
125
126	mkey = ServerInfo.rsa_private_key;
127
128	/*
129	* Compare the in-memory key to the key we just loaded above. If
130	* any of the portions don't match, then logically we have a different
131	* in-memory key vs. the one we just loaded. This is bad, mmmkay?
132	*/
133	if (mkey->pad != key->pad)
134	ilog(L_CRIT, "Private key corrupted: pad %i != pad %i",
135	mkey->pad, key->pad);
136
137	if (mkey->version != key->version)
138	ilog(L_CRIT, "Private key corrupted: version %li != version %li",
139	mkey->version, key->version);
140
141	if (BN_cmp(mkey->n, key->n))
142	ilog(L_CRIT, "Private key corrupted: n differs");
143	if (BN_cmp(mkey->e, key->e))
144	ilog(L_CRIT, "Private key corrupted: e differs");
145	if (BN_cmp(mkey->d, key->d))
146	ilog(L_CRIT, "Private key corrupted: d differs");
147	if (BN_cmp(mkey->p, key->p))
148	ilog(L_CRIT, "Private key corrupted: p differs");
149	if (BN_cmp(mkey->q, key->q))
150	ilog(L_CRIT, "Private key corrupted: q differs");
151	if (BN_cmp(mkey->dmp1, key->dmp1))
152	ilog(L_CRIT, "Private key corrupted: dmp1 differs");
153	if (BN_cmp(mkey->dmq1, key->dmq1))
154	ilog(L_CRIT, "Private key corrupted: dmq1 differs");
155	if (BN_cmp(mkey->iqmp, key->iqmp))
156	ilog(L_CRIT, "Private key corrupted: iqmp differs");
157
158	RSA_free(key);
159	return 0;
160	}
161
162
163	static void
164	binary_to_hex(unsigned char bin, char hex, int length)
165	{
166	static const char trans[] = "0123456789ABCDEF";
167	int i;
168
169	for (i = 0; i < length; i++)
170	{
171	hex[i << 1] = trans[bin[i] >> 4];
172	hex[(i << 1) + 1] = trans[bin[i] & 0xf];
173	}
174
175	hex[i << 1] = '\0';
176	}
177
178	int
179	get_randomness(unsigned char *buf, int length)
180	{
181	/* Seed OpenSSL PRNG with EGD enthropy pool -kre */
182	if (ConfigFileEntry.use_egd &&
183	(ConfigFileEntry.egdpool_path != NULL))
184	{
185	if (RAND_egd(ConfigFileEntry.egdpool_path) == -1)
186	return -1;
187	}
188
189	if (RAND_status())
190	return (RAND_bytes(buf, length));
191	else /* XXX - abort? */
192	return (RAND_pseudo_bytes(buf, length));
193	}
194
195	int
196	generate_challenge(char r_challenge, char r_response, RSA *rsa)
197	{
198	unsigned char secret[32], *tmp;
199	unsigned long length;
200	int ret = -1;
201
202	if (!rsa)
203	return -1;
204	get_randomness(secret, 32);
205	*r_response = MyMalloc(65);
206	binary_to_hex(secret, *r_response, 32);
207
208	length = RSA_size(rsa);
209	tmp = MyMalloc(length);
210	ret = RSA_public_encrypt(32, secret, tmp, rsa, RSA_PKCS1_PADDING);
211
212	*r_challenge = MyMalloc((length << 1) + 1);
213	binary_to_hex( tmp, *r_challenge, length);
214	(*r_challenge)[length<<1] = 0;
215	MyFree(tmp);
216
217	if (ret < 0)
218	{
219	report_crypto_errors();
220	return -1;
221	}
222	return 0;
223	}