[irc/rqf/shadowircd.git] / modules / m_challenge.c

/*
 *  ircd-ratbox: A slightly useful ircd.
 *  m_challenge.c: Allows an IRC Operator to securely authenticate.
 *
 *  Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
 *  Copyright (C) 1996-2002 Hybrid Development Team
 *  Copyright (C) 2002-2005 ircd-ratbox development team
 *
 *  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: m_challenge.c 3161 2007-01-25 07:23:01Z nenolod $
 */

#include "stdinc.h"

#ifdef HAVE_LIBCRYPTO
#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>
#endif

#include "client.h"
#include "ircd.h"
#include "modules.h"
#include "numeric.h"
#include "send.h"
#include "s_conf.h"
#include "msg.h"
#include "parse.h"
#include "match.h"
#include "logger.h"
#include "s_user.h"
#include "cache.h"
#include "s_newconf.h"

#define CHALLENGE_WIDTH BUFSIZE - (NICKLEN + HOSTLEN + 12)
#define CHALLENGE_EXPIRES	180	/* 180 seconds should be more than long enough */
#define CHALLENGE_SECRET_LENGTH	128	/* how long our challenge secret should be */

#ifndef HAVE_LIBCRYPTO
/* Maybe this should be an error or something?-davidt */
/* now it is	-larne	*/
static int	challenge_load(void)
{
#ifndef STATIC_MODULES
	sendto_realops_snomask(SNO_GENERAL, L_ALL, 
		"Challenge module not loaded because OpenSSL is not available.");
	ilog(L_MAIN, "Challenge module not loaded because OpenSSL is not available.");
	return -1;
#else
	return 0;
#endif
}

DECLARE_MODULE_AV1(challenge, challenge_load, NULL, NULL, NULL, NULL, "$Revision: 3161 $");
#else

static int m_challenge(struct Client *, struct Client *, int, const char **);

/* We have openssl support, so include /CHALLENGE */
struct Message challenge_msgtab = {
	"CHALLENGE", 0, 0, 0, MFLG_SLOW,
	{mg_unreg, {m_challenge, 2}, mg_ignore, mg_ignore, mg_ignore, {m_challenge, 2}}
};

mapi_clist_av1 challenge_clist[] = { &challenge_msgtab, NULL };
DECLARE_MODULE_AV1(challenge, NULL, NULL, challenge_clist, NULL, NULL, "$Revision: 3161 $");

static int generate_challenge(char **r_challenge, char **r_response, RSA * key);

static void
cleanup_challenge(struct Client *target_p)
{
	if(target_p->localClient == NULL)
		return;
	
	rb_free(target_p->localClient->challenge);
	rb_free(target_p->localClient->opername);
	target_p->localClient->challenge = NULL;
	target_p->localClient->opername = NULL;
	target_p->localClient->chal_time = 0;
}

/*
 * m_challenge - generate RSA challenge for wouldbe oper
 * parv[0] = sender prefix
 * parv[1] = operator to challenge for, or +response
 *
 */
static int
m_challenge(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
	struct oper_conf *oper_p;
	char *challenge = NULL; /* to placate gcc */
	char chal_line[CHALLENGE_WIDTH]; 
	unsigned char *b_response;
	size_t cnt;
	int len = 0;

	/* if theyre an oper, reprint oper motd and ignore */
	if(IsOper(source_p))
	{
		sendto_one(source_p, form_str(RPL_YOUREOPER), me.name, source_p->name);
		send_oper_motd(source_p);
		return 0;
	}

	if(*parv[1] == '+')
	{
		/* Ignore it if we aren't expecting this... -A1kmm */
		if(!source_p->localClient->challenge)
			return 0;

		if((rb_current_time() - source_p->localClient->chal_time) > CHALLENGE_EXPIRES)
		{
			sendto_one(source_p, form_str(ERR_PASSWDMISMATCH), me.name, source_p->name);
			ilog(L_FOPER, "EXPIRED CHALLENGE (%s) by (%s!%s@%s) (%s)",
			     source_p->localClient->opername, source_p->name,
			     source_p->username, source_p->host, source_p->sockhost);

			if(ConfigFileEntry.failed_oper_notice)
				sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
						     "Expired CHALLENGE attempt by %s (%s@%s)",
						     source_p->name, source_p->username,
						     source_p->host);
			cleanup_challenge(source_p);
			return 0;			
		}

		b_response = rb_base64_decode((const unsigned char *)++parv[1], strlen(parv[1]), &len);

		if(len != SHA_DIGEST_LENGTH ||
		   memcmp(source_p->localClient->challenge, b_response, SHA_DIGEST_LENGTH))
		{
			sendto_one(source_p, form_str(ERR_PASSWDMISMATCH), me.name, source_p->name);
			ilog(L_FOPER, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s)",
			     source_p->localClient->opername, source_p->name,
			     source_p->username, source_p->host, source_p->sockhost);

			if(ConfigFileEntry.failed_oper_notice)
				sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
						     "Failed CHALLENGE attempt by %s (%s@%s)",
						     source_p->name, source_p->username,
						     source_p->host);

			rb_free(b_response);
			cleanup_challenge(source_p);
			return 0;
		}

		rb_free(b_response);

		oper_p = find_oper_conf(source_p->username, source_p->orighost, 
					source_p->sockhost, 
					source_p->localClient->opername);

		if(oper_p == NULL)
		{
			sendto_one(source_p, form_str(ERR_NOOPERHOST), 
				   me.name, source_p->name);
			ilog(L_FOPER, "FAILED OPER (%s) by (%s!%s@%s) (%s)",
			     source_p->localClient->opername, source_p->name,
			     source_p->username, source_p->host,
			     source_p->sockhost);

			if(ConfigFileEntry.failed_oper_notice)
				sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
						     "Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
						     source_p->name, source_p->username,
						     source_p->host);
			return 0;
		}

		cleanup_challenge(source_p);

		oper_up(source_p, oper_p);

		ilog(L_OPERED, "OPER %s by %s!%s@%s (%s)",
		     source_p->localClient->opername, source_p->name, 
		     source_p->username, source_p->host, source_p->sockhost);
		return 0;
	}

	cleanup_challenge(source_p);

	oper_p = find_oper_conf(source_p->username, source_p->orighost, 
				source_p->sockhost, parv[1]);

	if(oper_p == NULL)
	{
		sendto_one(source_p, form_str(ERR_NOOPERHOST), me.name, source_p->name);
		ilog(L_FOPER, "FAILED OPER (%s) by (%s!%s@%s) (%s)",
		     parv[1], source_p->name,
		     source_p->username, source_p->host, source_p->sockhost);

		if(ConfigFileEntry.failed_oper_notice)
			sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
					     "Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
					     source_p->name, source_p->username, source_p->host);
		return 0;
	}

	if(!oper_p->rsa_pubkey)
	{
		sendto_one_notice(source_p, ":I'm sorry, PK authentication is not enabled for your oper{} block.");
		return 0;
	}

	if(IsOperConfNeedSSL(oper_p) && !IsSSLClient(source_p))
	{
		sendto_one(source_p, form_str(ERR_NOOPERHOST), me.name, source_p->name);
		ilog(L_FOPER, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s) -- requires SSL/TLS",
		     parv[1], source_p->name, source_p->username, source_p->host,
		     source_p->sockhost);

		if(ConfigFileEntry.failed_oper_notice)
		{
			sendto_realops_snomask(SNO_GENERAL, L_ALL,
					     "Failed CHALLENGE attempt - missing SSL/TLS by %s (%s@%s)",
					     source_p->name, source_p->username, source_p->host);
		}
		return 0;
	}

	if(!generate_challenge(&challenge, &(source_p->localClient->challenge), oper_p->rsa_pubkey))
	{
		char *chal = challenge;
		source_p->localClient->chal_time = rb_current_time();
		for(;;)
		{
			cnt = rb_strlcpy(chal_line, chal, CHALLENGE_WIDTH);
			sendto_one(source_p, form_str(RPL_RSACHALLENGE2), me.name, source_p->name, chal_line);
			if(cnt > CHALLENGE_WIDTH)
				chal += CHALLENGE_WIDTH - 1;
			else
				break;
			
		}
		sendto_one(source_p, form_str(RPL_ENDOFRSACHALLENGE2), 
			   me.name, source_p->name);
		rb_free(challenge);
		source_p->localClient->opername = rb_strdup(oper_p->name);
	}
	else
		sendto_one_notice(source_p, ":Failed to generate challenge.");

	return 0;
}

static int
generate_challenge(char **r_challenge, char **r_response, RSA * rsa)
{
	SHA_CTX ctx;
	unsigned char secret[CHALLENGE_SECRET_LENGTH], *tmp;
	unsigned long length;
	unsigned long e = 0;
	unsigned long cnt = 0;
	int ret;

	if(!rsa)
		return -1;
	if(rb_get_random(secret, CHALLENGE_SECRET_LENGTH))
	{
		SHA1_Init(&ctx);
		SHA1_Update(&ctx, (uint8_t *)secret, CHALLENGE_SECRET_LENGTH);
		*r_response = malloc(SHA_DIGEST_LENGTH);
		SHA1_Final((uint8_t *)*r_response, &ctx);

		length = RSA_size(rsa);
		tmp = rb_malloc(length);
		ret = RSA_public_encrypt(CHALLENGE_SECRET_LENGTH, secret, tmp, rsa, RSA_PKCS1_OAEP_PADDING);

		if(ret >= 0)
		{
			*r_challenge = (char *)rb_base64_encode(tmp, ret);
			rb_free(tmp);
			return 0;
		}

		rb_free(tmp);
		rb_free(*r_response);
		*r_response = NULL;
	}

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

	return (-1);
}

#endif /* HAVE_LIBCRYPTO */
Commit	Line	Data
212380e3	1	/*
	2	* ircd-ratbox: A slightly useful ircd.
	3	* m_challenge.c: Allows an IRC Operator to securely authenticate.
	4	*
	5	* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
	6	* Copyright (C) 1996-2002 Hybrid Development Team
	7	* Copyright (C) 2002-2005 ircd-ratbox development team
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
	22	* USA
	23	*
5366977b	24	* $Id: m_challenge.c 3161 2007-01-25 07:23:01Z nenolod $
212380e3	25	*/
	26
	27	#include "stdinc.h"
	28
	29	#ifdef HAVE_LIBCRYPTO
	30	#include <openssl/pem.h>
	31	#include <openssl/rand.h>
	32	#include <openssl/rsa.h>
	33	#include <openssl/md5.h>
	34	#include <openssl/bn.h>
	35	#include <openssl/evp.h>
	36	#include <openssl/err.h>
	37	#endif
	38
212380e3	39	#include "client.h"
	40	#include "ircd.h"
	41	#include "modules.h"
	42	#include "numeric.h"
	43	#include "send.h"
	44	#include "s_conf.h"
	45	#include "msg.h"
	46	#include "parse.h"
13ae2f4b	47	#include "match.h"
d3455e2c	48	#include "logger.h"
212380e3	49	#include "s_user.h"
	50	#include "cache.h"
	51	#include "s_newconf.h"
	52
	53	#define CHALLENGE_WIDTH BUFSIZE - (NICKLEN + HOSTLEN + 12)
	54	#define CHALLENGE_EXPIRES 180 /* 180 seconds should be more than long enough */
	55	#define CHALLENGE_SECRET_LENGTH 128 /* how long our challenge secret should be */
	56
	57	#ifndef HAVE_LIBCRYPTO
	58	/* Maybe this should be an error or something?-davidt */
	59	/* now it is -larne */
	60	static int challenge_load(void)
	61	{
	62	#ifndef STATIC_MODULES
	63	sendto_realops_snomask(SNO_GENERAL, L_ALL,
	64	"Challenge module not loaded because OpenSSL is not available.");
	65	ilog(L_MAIN, "Challenge module not loaded because OpenSSL is not available.");
	66	return -1;
	67	#else
	68	return 0;
	69	#endif
	70	}
	71
5366977b	72	DECLARE_MODULE_AV1(challenge, challenge_load, NULL, NULL, NULL, NULL, "$Revision: 3161 $");
212380e3	73	#else
	74
	75	static int m_challenge(struct Client , struct Client , int, const char **);
	76
	77	/* We have openssl support, so include /CHALLENGE */
	78	struct Message challenge_msgtab = {
	79	"CHALLENGE", 0, 0, 0, MFLG_SLOW,
	80	{mg_unreg, {m_challenge, 2}, mg_ignore, mg_ignore, mg_ignore, {m_challenge, 2}}
	81	};
	82
	83	mapi_clist_av1 challenge_clist[] = { &challenge_msgtab, NULL };
5366977b	84	DECLARE_MODULE_AV1(challenge, NULL, NULL, challenge_clist, NULL, NULL, "$Revision: 3161 $");
212380e3	85
	86	static int generate_challenge(char r_challenge, char r_response, RSA * key);
	87
	88	static void
	89	cleanup_challenge(struct Client *target_p)
	90	{
	91	if(target_p->localClient == NULL)
	92	return;
	93
90a3c35b VY	94	rb_free(target_p->localClient->challenge);
90a3c35b VY	95	rb_free(target_p->localClient->opername);
212380e3	96	target_p->localClient->challenge = NULL;
	97	target_p->localClient->opername = NULL;
	98	target_p->localClient->chal_time = 0;
	99	}
	100
	101	/*
	102	* m_challenge - generate RSA challenge for wouldbe oper
	103	* parv[0] = sender prefix
	104	* parv[1] = operator to challenge for, or +response
	105	*
	106	*/
	107	static int
	108	m_challenge(struct Client client_p, struct Client source_p, int parc, const char *parv[])
	109	{
	110	struct oper_conf *oper_p;
	111	char challenge = NULL; / to placate gcc */
	112	char chal_line[CHALLENGE_WIDTH];
	113	unsigned char *b_response;
	114	size_t cnt;
	115	int len = 0;
	116
	117	/* if theyre an oper, reprint oper motd and ignore */
	118	if(IsOper(source_p))
	119	{
	120	sendto_one(source_p, form_str(RPL_YOUREOPER), me.name, source_p->name);
	121	send_oper_motd(source_p);
	122	return 0;
	123	}
	124
	125	if(*parv[1] == '+')
	126	{
	127	/* Ignore it if we aren't expecting this... -A1kmm */
	128	if(!source_p->localClient->challenge)
	129	return 0;
	130
9f6bbe3c	131	if((rb_current_time() - source_p->localClient->chal_time) > CHALLENGE_EXPIRES)
212380e3	132	{
	133	sendto_one(source_p, form_str(ERR_PASSWDMISMATCH), me.name, source_p->name);
	134	ilog(L_FOPER, "EXPIRED CHALLENGE (%s) by (%s!%s@%s) (%s)",
	135	source_p->localClient->opername, source_p->name,
	136	source_p->username, source_p->host, source_p->sockhost);
	137
	138	if(ConfigFileEntry.failed_oper_notice)
	139	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	140	"Expired CHALLENGE attempt by %s (%s@%s)",
	141	source_p->name, source_p->username,
	142	source_p->host);
	143	cleanup_challenge(source_p);
	144	return 0;
	145	}
	146
b798359b	147	b_response = rb_base64_decode((const unsigned char *)++parv[1], strlen(parv[1]), &len);
212380e3	148
	149	if(len != SHA_DIGEST_LENGTH \|\|
	150	memcmp(source_p->localClient->challenge, b_response, SHA_DIGEST_LENGTH))
	151	{
	152	sendto_one(source_p, form_str(ERR_PASSWDMISMATCH), me.name, source_p->name);
	153	ilog(L_FOPER, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s)",
	154	source_p->localClient->opername, source_p->name,
	155	source_p->username, source_p->host, source_p->sockhost);
	156
	157	if(ConfigFileEntry.failed_oper_notice)
	158	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	159	"Failed CHALLENGE attempt by %s (%s@%s)",
	160	source_p->name, source_p->username,
	161	source_p->host);
	162
90a3c35b	163	rb_free(b_response);
212380e3	164	cleanup_challenge(source_p);
	165	return 0;
	166	}
	167
90a3c35b	168	rb_free(b_response);
212380e3	169
	170	oper_p = find_oper_conf(source_p->username, source_p->orighost,
	171	source_p->sockhost,
	172	source_p->localClient->opername);
	173
	174	if(oper_p == NULL)
	175	{
	176	sendto_one(source_p, form_str(ERR_NOOPERHOST),
	177	me.name, source_p->name);
	178	ilog(L_FOPER, "FAILED OPER (%s) by (%s!%s@%s) (%s)",
	179	source_p->localClient->opername, source_p->name,
	180	source_p->username, source_p->host,
	181	source_p->sockhost);
	182
	183	if(ConfigFileEntry.failed_oper_notice)
	184	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	185	"Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
	186	source_p->name, source_p->username,
	187	source_p->host);
	188	return 0;
	189	}
	190
	191	cleanup_challenge(source_p);
	192
	193	oper_up(source_p, oper_p);
	194
	195	ilog(L_OPERED, "OPER %s by %s!%s@%s (%s)",
	196	source_p->localClient->opername, source_p->name,
	197	source_p->username, source_p->host, source_p->sockhost);
	198	return 0;
	199	}
	200
	201	cleanup_challenge(source_p);
	202
	203	oper_p = find_oper_conf(source_p->username, source_p->orighost,
	204	source_p->sockhost, parv[1]);
	205
	206	if(oper_p == NULL)
	207	{
	208	sendto_one(source_p, form_str(ERR_NOOPERHOST), me.name, source_p->name);
	209	ilog(L_FOPER, "FAILED OPER (%s) by (%s!%s@%s) (%s)",
	210	parv[1], source_p->name,
	211	source_p->username, source_p->host, source_p->sockhost);
	212
	213	if(ConfigFileEntry.failed_oper_notice)
	214	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	215	"Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
	216	source_p->name, source_p->username, source_p->host);
	217	return 0;
	218	}
	219
	220	if(!oper_p->rsa_pubkey)
	221	{
5366977b	222	sendto_one_notice(source_p, ":I'm sorry, PK authentication is not enabled for your oper{} block.");
212380e3	223	return 0;
	224	}
	225
663bbb28 JT	226	if(IsOperConfNeedSSL(oper_p) && !IsSSLClient(source_p))
	227	{
	228	sendto_one(source_p, form_str(ERR_NOOPERHOST), me.name, source_p->name);
	229	ilog(L_FOPER, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s) -- requires SSL/TLS",
	230	parv[1], source_p->name, source_p->username, source_p->host,
	231	source_p->sockhost);
	232
	233	if(ConfigFileEntry.failed_oper_notice)
	234	{
	235	sendto_realops_snomask(SNO_GENERAL, L_ALL,
	236	"Failed CHALLENGE attempt - missing SSL/TLS by %s (%s@%s)",
	237	source_p->name, source_p->username, source_p->host);
	238	}
	239	return 0;
	240	}
	241
212380e3	242	if(!generate_challenge(&challenge, &(source_p->localClient->challenge), oper_p->rsa_pubkey))
	243	{
	244	char *chal = challenge;
9f6bbe3c	245	source_p->localClient->chal_time = rb_current_time();
212380e3	246	for(;;)
212380e3	247	{
907468c4	248	cnt = rb_strlcpy(chal_line, chal, CHALLENGE_WIDTH);
212380e3	249	sendto_one(source_p, form_str(RPL_RSACHALLENGE2), me.name, source_p->name, chal_line);
	250	if(cnt > CHALLENGE_WIDTH)
	251	chal += CHALLENGE_WIDTH - 1;
	252	else
	253	break;
	254
	255	}
	256	sendto_one(source_p, form_str(RPL_ENDOFRSACHALLENGE2),
	257	me.name, source_p->name);
90a3c35b	258	rb_free(challenge);
8e43b0b4	259	source_p->localClient->opername = rb_strdup(oper_p->name);
212380e3	260	}
	261	else
	262	sendto_one_notice(source_p, ":Failed to generate challenge.");
	263
	264	return 0;
	265	}
	266
212380e3	267	static int
	268	generate_challenge(char r_challenge, char r_response, RSA * rsa)
	269	{
	270	SHA_CTX ctx;
	271	unsigned char secret[CHALLENGE_SECRET_LENGTH], *tmp;
	272	unsigned long length;
	273	unsigned long e = 0;
	274	unsigned long cnt = 0;
	275	int ret;
	276
	277	if(!rsa)
	278	return -1;
26673969	279	if(rb_get_random(secret, CHALLENGE_SECRET_LENGTH))
212380e3	280	{
212380e3	281	SHA1_Init(&ctx);
26673969 VY	282	SHA1_Update(&ctx, (uint8_t *)secret, CHALLENGE_SECRET_LENGTH);
	283	*r_response = malloc(SHA_DIGEST_LENGTH);
	284	SHA1_Final((uint8_t )r_response, &ctx);
212380e3	285
212380e3	286	length = RSA_size(rsa);
8e43b0b4	287	tmp = rb_malloc(length);
212380e3	288	ret = RSA_public_encrypt(CHALLENGE_SECRET_LENGTH, secret, tmp, rsa, RSA_PKCS1_OAEP_PADDING);
212380e3	289
26673969	290	if(ret >= 0)
212380e3	291	{
26673969	292	r_challenge = (char )rb_base64_encode(tmp, ret);
90a3c35b	293	rb_free(tmp);
212380e3	294	return 0;
212380e3	295	}
26673969	296
90a3c35b VY	297	rb_free(tmp);
90a3c35b VY	298	rb_free(*r_response);
212380e3	299	*r_response = NULL;
	300	}
	301
	302	ERR_load_crypto_strings();
	303	while ((cnt < 100) && (e = ERR_get_error()))
	304	{
	305	ilog(L_MAIN, "SSL error: %s", ERR_error_string(e, 0));
	306	cnt++;
	307	}
	308
	309	return (-1);
	310	}
	311
	312	#endif /* HAVE_LIBCRYPTO */