[solanum.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
 */

#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
}

static const char challenge_desc[] = "Does nothing as OpenSSL was not enabled.";

DECLARE_MODULE_AV2(challenge, challenge_load, NULL, NULL, NULL, NULL, NULL, NULL, challenge_desc);
#else

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

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

mapi_clist_av1 challenge_clist[] = { &challenge_msgtab, NULL };

static const char challenge_desc[] =
	"Provides the challenge-response facility used for becoming an IRC operator";


DECLARE_MODULE_AV2(challenge, NULL, NULL, challenge_clist, NULL, NULL, NULL, NULL, challenge_desc);

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 MsgBuf *msgbuf_p, 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;
		}

		parv[1]++;
		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 AC	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
212380e3 AC	23	*/
	24
	25	#include "stdinc.h"
	26
	27	#ifdef HAVE_LIBCRYPTO
	28	#include <openssl/pem.h>
	29	#include <openssl/rand.h>
	30	#include <openssl/rsa.h>
	31	#include <openssl/md5.h>
	32	#include <openssl/bn.h>
	33	#include <openssl/evp.h>
	34	#include <openssl/err.h>
	35	#endif
	36
212380e3 AC	37	#include "client.h"
	38	#include "ircd.h"
	39	#include "modules.h"
	40	#include "numeric.h"
	41	#include "send.h"
	42	#include "s_conf.h"
	43	#include "msg.h"
	44	#include "parse.h"
4562c604	45	#include "match.h"
4016731b	46	#include "logger.h"
212380e3 AC	47	#include "s_user.h"
	48	#include "cache.h"
	49	#include "s_newconf.h"
	50
	51	#define CHALLENGE_WIDTH BUFSIZE - (NICKLEN + HOSTLEN + 12)
	52	#define CHALLENGE_EXPIRES 180 /* 180 seconds should be more than long enough */
	53	#define CHALLENGE_SECRET_LENGTH 128 /* how long our challenge secret should be */
	54
	55	#ifndef HAVE_LIBCRYPTO
	56	/* Maybe this should be an error or something?-davidt */
	57	/* now it is -larne */
	58	static int challenge_load(void)
	59	{
	60	#ifndef STATIC_MODULES
55abcbb2	61	sendto_realops_snomask(SNO_GENERAL, L_ALL,
212380e3 AC	62	"Challenge module not loaded because OpenSSL is not available.");
	63	ilog(L_MAIN, "Challenge module not loaded because OpenSSL is not available.");
	64	return -1;
	65	#else
	66	return 0;
	67	#endif
	68	}
	69
5544da98 EM	70	static const char challenge_desc[] = "Does nothing as OpenSSL was not enabled.";
	71
	72	DECLARE_MODULE_AV2(challenge, challenge_load, NULL, NULL, NULL, NULL, NULL, NULL, challenge_desc);
212380e3 AC	73	#else
212380e3 AC	74
428ca87b	75	static int m_challenge(struct MsgBuf , struct Client , struct Client , int, const char *);
212380e3 AC	76
	77	/* We have openssl support, so include /CHALLENGE */
	78	struct Message challenge_msgtab = {
7baa37a9	79	"CHALLENGE", 0, 0, 0, 0,
212380e3 AC	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 };
5544da98 EM	84
	85	static const char challenge_desc[] =
	86	"Provides the challenge-response facility used for becoming an IRC operator";
	87
	88
	89	DECLARE_MODULE_AV2(challenge, NULL, NULL, challenge_clist, NULL, NULL, NULL, NULL, challenge_desc);
212380e3 AC	90
	91	static int generate_challenge(char r_challenge, char r_response, RSA * key);
	92
	93	static void
	94	cleanup_challenge(struct Client *target_p)
	95	{
	96	if(target_p->localClient == NULL)
	97	return;
55abcbb2	98
637c4932 VY	99	rb_free(target_p->localClient->challenge);
637c4932 VY	100	rb_free(target_p->localClient->opername);
212380e3 AC	101	target_p->localClient->challenge = NULL;
	102	target_p->localClient->opername = NULL;
	103	target_p->localClient->chal_time = 0;
	104	}
	105
	106	/*
	107	* m_challenge - generate RSA challenge for wouldbe oper
212380e3	108	* parv[1] = operator to challenge for, or +response
212380e3 AC	109	*/
212380e3 AC	110	static int
428ca87b	111	m_challenge(struct MsgBuf msgbuf_p, struct Client client_p, struct Client source_p, int parc, const char parv[])
212380e3 AC	112	{
	113	struct oper_conf *oper_p;
	114	char challenge = NULL; / to placate gcc */
55abcbb2	115	char chal_line[CHALLENGE_WIDTH];
212380e3 AC	116	unsigned char *b_response;
	117	size_t cnt;
	118	int len = 0;
	119
	120	/* if theyre an oper, reprint oper motd and ignore */
	121	if(IsOper(source_p))
	122	{
	123	sendto_one(source_p, form_str(RPL_YOUREOPER), me.name, source_p->name);
	124	send_oper_motd(source_p);
	125	return 0;
	126	}
	127
	128	if(*parv[1] == '+')
	129	{
	130	/* Ignore it if we aren't expecting this... -A1kmm */
	131	if(!source_p->localClient->challenge)
	132	return 0;
	133
e3354945	134	if((rb_current_time() - source_p->localClient->chal_time) > CHALLENGE_EXPIRES)
212380e3 AC	135	{
	136	sendto_one(source_p, form_str(ERR_PASSWDMISMATCH), me.name, source_p->name);
	137	ilog(L_FOPER, "EXPIRED CHALLENGE (%s) by (%s!%s@%s) (%s)",
	138	source_p->localClient->opername, source_p->name,
	139	source_p->username, source_p->host, source_p->sockhost);
	140
	141	if(ConfigFileEntry.failed_oper_notice)
	142	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	143	"Expired CHALLENGE attempt by %s (%s@%s)",
	144	source_p->name, source_p->username,
	145	source_p->host);
	146	cleanup_challenge(source_p);
55abcbb2	147	return 0;
212380e3 AC	148	}
212380e3 AC	149
6493f05d EM	150	parv[1]++;
6493f05d EM	151	b_response = rb_base64_decode((const unsigned char *)parv[1], strlen(parv[1]), &len);
212380e3 AC	152
	153	if(len != SHA_DIGEST_LENGTH \|\|
	154	memcmp(source_p->localClient->challenge, b_response, SHA_DIGEST_LENGTH))
	155	{
	156	sendto_one(source_p, form_str(ERR_PASSWDMISMATCH), me.name, source_p->name);
	157	ilog(L_FOPER, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s)",
	158	source_p->localClient->opername, source_p->name,
	159	source_p->username, source_p->host, source_p->sockhost);
	160
	161	if(ConfigFileEntry.failed_oper_notice)
	162	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	163	"Failed CHALLENGE attempt by %s (%s@%s)",
	164	source_p->name, source_p->username,
	165	source_p->host);
	166
637c4932	167	rb_free(b_response);
212380e3 AC	168	cleanup_challenge(source_p);
	169	return 0;
	170	}
	171
637c4932	172	rb_free(b_response);
212380e3	173
55abcbb2 KB	174	oper_p = find_oper_conf(source_p->username, source_p->orighost,
55abcbb2 KB	175	source_p->sockhost,
212380e3 AC	176	source_p->localClient->opername);
	177
	178	if(oper_p == NULL)
	179	{
76169ea7	180	sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
212380e3 AC	181	ilog(L_FOPER, "FAILED OPER (%s) by (%s!%s@%s) (%s)",
	182	source_p->localClient->opername, source_p->name,
	183	source_p->username, source_p->host,
	184	source_p->sockhost);
	185
	186	if(ConfigFileEntry.failed_oper_notice)
	187	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	188	"Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
	189	source_p->name, source_p->username,
	190	source_p->host);
	191	return 0;
	192	}
	193
	194	cleanup_challenge(source_p);
	195
	196	oper_up(source_p, oper_p);
	197
	198	ilog(L_OPERED, "OPER %s by %s!%s@%s (%s)",
55abcbb2	199	source_p->localClient->opername, source_p->name,
212380e3 AC	200	source_p->username, source_p->host, source_p->sockhost);
	201	return 0;
	202	}
	203
	204	cleanup_challenge(source_p);
	205
55abcbb2	206	oper_p = find_oper_conf(source_p->username, source_p->orighost,
212380e3 AC	207	source_p->sockhost, parv[1]);
	208
	209	if(oper_p == NULL)
	210	{
76169ea7	211	sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
212380e3 AC	212	ilog(L_FOPER, "FAILED OPER (%s) by (%s!%s@%s) (%s)",
	213	parv[1], source_p->name,
	214	source_p->username, source_p->host, source_p->sockhost);
	215
	216	if(ConfigFileEntry.failed_oper_notice)
	217	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	218	"Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
	219	source_p->name, source_p->username, source_p->host);
	220	return 0;
	221	}
	222
	223	if(!oper_p->rsa_pubkey)
	224	{
5366977b	225	sendto_one_notice(source_p, ":I'm sorry, PK authentication is not enabled for your oper{} block.");
212380e3 AC	226	return 0;
	227	}
	228
b1594414 JT	229	if(IsOperConfNeedSSL(oper_p) && !IsSSLClient(source_p))
b1594414 JT	230	{
76169ea7	231	sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
b1594414 JT	232	ilog(L_FOPER, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s) -- requires SSL/TLS",
	233	parv[1], source_p->name, source_p->username, source_p->host,
	234	source_p->sockhost);
	235
	236	if(ConfigFileEntry.failed_oper_notice)
	237	{
	238	sendto_realops_snomask(SNO_GENERAL, L_ALL,
	239	"Failed CHALLENGE attempt - missing SSL/TLS by %s (%s@%s)",
	240	source_p->name, source_p->username, source_p->host);
	241	}
	242	return 0;
	243	}
	244
ed8b3d69 AC	245	if (oper_p->certfp != NULL)
	246	{
	247	if (source_p->certfp == NULL \|\| strcasecmp(source_p->certfp, oper_p->certfp))
	248	{
	249	sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
	250	ilog(L_FOPER, "FAILED OPER (%s) by (%s!%s@%s) (%s) -- client certificate fingerprint mismatch",
fad065bb	251	parv[1], source_p->name,
ed8b3d69 AC	252	source_p->username, source_p->host, source_p->sockhost);
	253
	254	if(ConfigFileEntry.failed_oper_notice)
	255	{
	256	sendto_realops_snomask(SNO_GENERAL, L_ALL,
	257	"Failed OPER attempt - client certificate fingerprint mismatch by %s (%s@%s)",
	258	source_p->name, source_p->username, source_p->host);
	259	}
	260	return 0;
	261	}
	262	}
	263
212380e3 AC	264	if(!generate_challenge(&challenge, &(source_p->localClient->challenge), oper_p->rsa_pubkey))
	265	{
	266	char *chal = challenge;
e3354945	267	source_p->localClient->chal_time = rb_current_time();
212380e3 AC	268	for(;;)
212380e3 AC	269	{
f427c8b0	270	cnt = rb_strlcpy(chal_line, chal, CHALLENGE_WIDTH);
212380e3 AC	271	sendto_one(source_p, form_str(RPL_RSACHALLENGE2), me.name, source_p->name, chal_line);
	272	if(cnt > CHALLENGE_WIDTH)
	273	chal += CHALLENGE_WIDTH - 1;
	274	else
	275	break;
55abcbb2	276
212380e3	277	}
55abcbb2	278	sendto_one(source_p, form_str(RPL_ENDOFRSACHALLENGE2),
212380e3	279	me.name, source_p->name);
637c4932	280	rb_free(challenge);
eddc2ab6	281	source_p->localClient->opername = rb_strdup(oper_p->name);
212380e3 AC	282	}
	283	else
	284	sendto_one_notice(source_p, ":Failed to generate challenge.");
	285
	286	return 0;
	287	}
	288
212380e3 AC	289	static int
	290	generate_challenge(char r_challenge, char r_response, RSA * rsa)
	291	{
	292	SHA_CTX ctx;
	293	unsigned char secret[CHALLENGE_SECRET_LENGTH], *tmp;
	294	unsigned long length;
	295	unsigned long e = 0;
	296	unsigned long cnt = 0;
	297	int ret;
	298
	299	if(!rsa)
	300	return -1;
f55930ac	301	if(rb_get_random(secret, CHALLENGE_SECRET_LENGTH))
212380e3 AC	302	{
212380e3 AC	303	SHA1_Init(&ctx);
f55930ac VY	304	SHA1_Update(&ctx, (uint8_t *)secret, CHALLENGE_SECRET_LENGTH);
	305	*r_response = malloc(SHA_DIGEST_LENGTH);
	306	SHA1_Final((uint8_t )r_response, &ctx);
212380e3 AC	307
212380e3 AC	308	length = RSA_size(rsa);
eddc2ab6	309	tmp = rb_malloc(length);
212380e3 AC	310	ret = RSA_public_encrypt(CHALLENGE_SECRET_LENGTH, secret, tmp, rsa, RSA_PKCS1_OAEP_PADDING);
212380e3 AC	311
f55930ac	312	if(ret >= 0)
212380e3	313	{
f55930ac	314	r_challenge = (char )rb_base64_encode(tmp, ret);
637c4932	315	rb_free(tmp);
212380e3 AC	316	return 0;
212380e3 AC	317	}
f55930ac	318
637c4932 VY	319	rb_free(tmp);
637c4932 VY	320	rb_free(*r_response);
212380e3 AC	321	*r_response = NULL;
	322	}
	323
	324	ERR_load_crypto_strings();
	325	while ((cnt < 100) && (e = ERR_get_error()))
	326	{
	327	ilog(L_MAIN, "SSL error: %s", ERR_error_string(e, 0));
	328	cnt++;
	329	}
	330
	331	return (-1);
	332	}
	333
	334	#endif /* HAVE_LIBCRYPTO */