[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[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_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
			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_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
		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_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
		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 (oper_p->certfp != NULL)
	{
		if (source_p->certfp == NULL || strcasecmp(source_p->certfp, oper_p->certfp))
		{
			sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
			ilog(L_FOPER, "FAILED OPER (%s) by (%s!%s@%s) (%s) -- client certificate fingerprint mismatch",
			     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 OPER attempt - client certificate fingerprint mismatch 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
212380e3	103	* parv[1] = operator to challenge for, or +response
	104	*
	105	*/
	106	static int
	107	m_challenge(struct Client client_p, struct Client source_p, int parc, const char *parv[])
	108	{
	109	struct oper_conf *oper_p;
	110	char challenge = NULL; / to placate gcc */
	111	char chal_line[CHALLENGE_WIDTH];
	112	unsigned char *b_response;
	113	size_t cnt;
	114	int len = 0;
	115
	116	/* if theyre an oper, reprint oper motd and ignore */
	117	if(IsOper(source_p))
	118	{
	119	sendto_one(source_p, form_str(RPL_YOUREOPER), me.name, source_p->name);
	120	send_oper_motd(source_p);
	121	return 0;
	122	}
	123
	124	if(*parv[1] == '+')
	125	{
	126	/* Ignore it if we aren't expecting this... -A1kmm */
	127	if(!source_p->localClient->challenge)
	128	return 0;
	129
9f6bbe3c	130	if((rb_current_time() - source_p->localClient->chal_time) > CHALLENGE_EXPIRES)
212380e3	131	{
	132	sendto_one(source_p, form_str(ERR_PASSWDMISMATCH), me.name, source_p->name);
	133	ilog(L_FOPER, "EXPIRED CHALLENGE (%s) by (%s!%s@%s) (%s)",
	134	source_p->localClient->opername, source_p->name,
	135	source_p->username, source_p->host, source_p->sockhost);
	136
	137	if(ConfigFileEntry.failed_oper_notice)
	138	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	139	"Expired CHALLENGE attempt by %s (%s@%s)",
	140	source_p->name, source_p->username,
	141	source_p->host);
	142	cleanup_challenge(source_p);
	143	return 0;
	144	}
	145
b798359b	146	b_response = rb_base64_decode((const unsigned char *)++parv[1], strlen(parv[1]), &len);
212380e3	147
	148	if(len != SHA_DIGEST_LENGTH \|\|
	149	memcmp(source_p->localClient->challenge, b_response, SHA_DIGEST_LENGTH))
	150	{
	151	sendto_one(source_p, form_str(ERR_PASSWDMISMATCH), me.name, source_p->name);
	152	ilog(L_FOPER, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s)",
	153	source_p->localClient->opername, source_p->name,
	154	source_p->username, source_p->host, source_p->sockhost);
	155
	156	if(ConfigFileEntry.failed_oper_notice)
	157	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	158	"Failed CHALLENGE attempt by %s (%s@%s)",
	159	source_p->name, source_p->username,
	160	source_p->host);
	161
90a3c35b	162	rb_free(b_response);
212380e3	163	cleanup_challenge(source_p);
	164	return 0;
	165	}
	166
90a3c35b	167	rb_free(b_response);
212380e3	168
	169	oper_p = find_oper_conf(source_p->username, source_p->orighost,
	170	source_p->sockhost,
	171	source_p->localClient->opername);
	172
	173	if(oper_p == NULL)
	174	{
e4c72f79	175	sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
212380e3	176	ilog(L_FOPER, "FAILED OPER (%s) by (%s!%s@%s) (%s)",
	177	source_p->localClient->opername, source_p->name,
	178	source_p->username, source_p->host,
	179	source_p->sockhost);
	180
	181	if(ConfigFileEntry.failed_oper_notice)
	182	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	183	"Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
	184	source_p->name, source_p->username,
	185	source_p->host);
	186	return 0;
	187	}
	188
	189	cleanup_challenge(source_p);
	190
	191	oper_up(source_p, oper_p);
	192
	193	ilog(L_OPERED, "OPER %s by %s!%s@%s (%s)",
	194	source_p->localClient->opername, source_p->name,
	195	source_p->username, source_p->host, source_p->sockhost);
	196	return 0;
	197	}
	198
	199	cleanup_challenge(source_p);
	200
	201	oper_p = find_oper_conf(source_p->username, source_p->orighost,
	202	source_p->sockhost, parv[1]);
	203
	204	if(oper_p == NULL)
	205	{
e4c72f79	206	sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
212380e3	207	ilog(L_FOPER, "FAILED OPER (%s) by (%s!%s@%s) (%s)",
	208	parv[1], source_p->name,
	209	source_p->username, source_p->host, source_p->sockhost);
	210
	211	if(ConfigFileEntry.failed_oper_notice)
	212	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	213	"Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
	214	source_p->name, source_p->username, source_p->host);
	215	return 0;
	216	}
	217
	218	if(!oper_p->rsa_pubkey)
	219	{
5366977b	220	sendto_one_notice(source_p, ":I'm sorry, PK authentication is not enabled for your oper{} block.");
212380e3	221	return 0;
	222	}
	223
663bbb28 JT	224	if(IsOperConfNeedSSL(oper_p) && !IsSSLClient(source_p))
663bbb28 JT	225	{
e4c72f79	226	sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
663bbb28 JT	227	ilog(L_FOPER, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s) -- requires SSL/TLS",
	228	parv[1], source_p->name, source_p->username, source_p->host,
	229	source_p->sockhost);
	230
	231	if(ConfigFileEntry.failed_oper_notice)
	232	{
	233	sendto_realops_snomask(SNO_GENERAL, L_ALL,
	234	"Failed CHALLENGE attempt - missing SSL/TLS by %s (%s@%s)",
	235	source_p->name, source_p->username, source_p->host);
	236	}
	237	return 0;
	238	}
	239
1c19179d WP	240	if (oper_p->certfp != NULL)
	241	{
	242	if (source_p->certfp == NULL \|\| strcasecmp(source_p->certfp, oper_p->certfp))
	243	{
	244	sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
	245	ilog(L_FOPER, "FAILED OPER (%s) by (%s!%s@%s) (%s) -- client certificate fingerprint mismatch",
8a64e49e	246	parv[1], source_p->name,
1c19179d WP	247	source_p->username, source_p->host, source_p->sockhost);
	248
	249	if(ConfigFileEntry.failed_oper_notice)
	250	{
	251	sendto_realops_snomask(SNO_GENERAL, L_ALL,
	252	"Failed OPER attempt - client certificate fingerprint mismatch by %s (%s@%s)",
	253	source_p->name, source_p->username, source_p->host);
	254	}
	255	return 0;
	256	}
	257	}
	258
212380e3	259	if(!generate_challenge(&challenge, &(source_p->localClient->challenge), oper_p->rsa_pubkey))
	260	{
	261	char *chal = challenge;
9f6bbe3c	262	source_p->localClient->chal_time = rb_current_time();
212380e3	263	for(;;)
212380e3	264	{
907468c4	265	cnt = rb_strlcpy(chal_line, chal, CHALLENGE_WIDTH);
212380e3	266	sendto_one(source_p, form_str(RPL_RSACHALLENGE2), me.name, source_p->name, chal_line);
	267	if(cnt > CHALLENGE_WIDTH)
	268	chal += CHALLENGE_WIDTH - 1;
	269	else
	270	break;
	271
	272	}
	273	sendto_one(source_p, form_str(RPL_ENDOFRSACHALLENGE2),
	274	me.name, source_p->name);
90a3c35b	275	rb_free(challenge);
8e43b0b4	276	source_p->localClient->opername = rb_strdup(oper_p->name);
212380e3	277	}
	278	else
	279	sendto_one_notice(source_p, ":Failed to generate challenge.");
	280
	281	return 0;
	282	}
	283
212380e3	284	static int
	285	generate_challenge(char r_challenge, char r_response, RSA * rsa)
	286	{
	287	SHA_CTX ctx;
	288	unsigned char secret[CHALLENGE_SECRET_LENGTH], *tmp;
	289	unsigned long length;
	290	unsigned long e = 0;
	291	unsigned long cnt = 0;
	292	int ret;
	293
	294	if(!rsa)
	295	return -1;
26673969	296	if(rb_get_random(secret, CHALLENGE_SECRET_LENGTH))
212380e3	297	{
212380e3	298	SHA1_Init(&ctx);
26673969 VY	299	SHA1_Update(&ctx, (uint8_t *)secret, CHALLENGE_SECRET_LENGTH);
	300	*r_response = malloc(SHA_DIGEST_LENGTH);
	301	SHA1_Final((uint8_t )r_response, &ctx);
212380e3	302
212380e3	303	length = RSA_size(rsa);
8e43b0b4	304	tmp = rb_malloc(length);
212380e3	305	ret = RSA_public_encrypt(CHALLENGE_SECRET_LENGTH, secret, tmp, rsa, RSA_PKCS1_OAEP_PADDING);
212380e3	306
26673969	307	if(ret >= 0)
212380e3	308	{
26673969	309	r_challenge = (char )rb_base64_encode(tmp, ret);
90a3c35b	310	rb_free(tmp);
212380e3	311	return 0;
212380e3	312	}
26673969	313
90a3c35b VY	314	rb_free(tmp);
90a3c35b VY	315	rb_free(*r_response);
212380e3	316	*r_response = NULL;
	317	}
	318
	319	ERR_load_crypto_strings();
	320	while ((cnt < 100) && (e = ERR_get_error()))
	321	{
	322	ilog(L_MAIN, "SSL error: %s", ERR_error_string(e, 0));
	323	cnt++;
	324	}
	325
	326	return (-1);
	327	}
	328
	329	#endif /* HAVE_LIBCRYPTO */