[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

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

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

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

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

static void 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 };

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

static bool 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->user->opername);
	target_p->localClient->challenge = NULL;
	target_p->user->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 void
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 (ConfigFileEntry.oper_secure_only && !IsSecureClient(source_p))
        {
                sendto_one_notice(source_p, ":You must be using a secure connection to /CHALLENGE on this server");
                if (ConfigFileEntry.failed_oper_notice)
                {
                        sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
					"Failed CHALLENGE attempt - missing secure connection by %s (%s@%s)",
					source_p->name, source_p->username, source_p->host);
                }
                return;
        }

	/* 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;
	}

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

		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->user->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;
		}

		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->user->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;
		}

		rb_free(b_response);

		oper_p = find_oper_conf(source_p->username, source_p->orighost,
					source_p->sockhost,
					source_p->user->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->user->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;
		}

		cleanup_challenge(source_p);

		oper_up(source_p, oper_p);

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

	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;
	}

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

	if(IsOperConfNeedSSL(oper_p) && !IsSecureClient(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_NETWIDE,
					     "Failed CHALLENGE attempt - missing SSL/TLS by %s (%s@%s)",
					     source_p->name, source_p->username, source_p->host);
		}
		return;
	}

	if (oper_p->certfp != NULL)
	{
		if (source_p->certfp == NULL || rb_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_NETWIDE,
						     "Failed OPER attempt - client certificate fingerprint mismatch by %s (%s@%s)",
						     source_p->name, source_p->username, source_p->host);
			}
			return;
		}
	}

	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->user->opername = rb_strdup(oper_p->name);
	}
	else
		sendto_one_notice(source_p, ":Failed to generate challenge.");
}

static bool
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 false;
	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 true;
		}

		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 false;
}

#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
eeabf33a EM	56
	57	static const char challenge_desc[] = "Does nothing as OpenSSL was not enabled.";
	58
212380e3 AC	59	/* Maybe this should be an error or something?-davidt */
212380e3 AC	60	/* now it is -larne */
eeabf33a	61	static int challenge_load(void)
212380e3	62	{
a9227555	63	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
212380e3 AC	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;
212380e3 AC	67	}
212380e3 AC	68
5544da98	69	DECLARE_MODULE_AV2(challenge, challenge_load, NULL, NULL, NULL, NULL, NULL, NULL, challenge_desc);
212380e3 AC	70	#else
212380e3 AC	71
eeabf33a EM	72	static const char challenge_desc[] =
	73	"Provides the challenge-response facility used for becoming an IRC operator";
	74
3c7d6fcc	75	static void 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	84
5544da98	85	DECLARE_MODULE_AV2(challenge, NULL, NULL, challenge_clist, NULL, NULL, NULL, NULL, challenge_desc);
212380e3	86
3c7d6fcc	87	static bool generate_challenge(char r_challenge, char r_response, RSA * key);
212380e3 AC	88
	89	static void
	90	cleanup_challenge(struct Client *target_p)
	91	{
	92	if(target_p->localClient == NULL)
	93	return;
55abcbb2	94
637c4932	95	rb_free(target_p->localClient->challenge);
ed3ca2ff	96	rb_free(target_p->user->opername);
212380e3	97	target_p->localClient->challenge = NULL;
ed3ca2ff	98	target_p->user->opername = NULL;
212380e3 AC	99	target_p->localClient->chal_time = 0;
	100	}
	101
	102	/*
	103	* m_challenge - generate RSA challenge for wouldbe oper
212380e3	104	* parv[1] = operator to challenge for, or +response
212380e3	105	*/
3c7d6fcc	106	static void
428ca87b	107	m_challenge(struct MsgBuf msgbuf_p, struct Client client_p, struct Client source_p, int parc, const char parv[])
212380e3 AC	108	{
	109	struct oper_conf *oper_p;
	110	char challenge = NULL; / to placate gcc */
55abcbb2	111	char chal_line[CHALLENGE_WIDTH];
212380e3 AC	112	unsigned char *b_response;
	113	size_t cnt;
	114	int len = 0;
	115
40ecb85a	116	if (ConfigFileEntry.oper_secure_only && !IsSecureClient(source_p))
	117	{
	118	sendto_one_notice(source_p, ":You must be using a secure connection to /CHALLENGE on this server");
	119	if (ConfigFileEntry.failed_oper_notice)
	120	{
	121	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	122	"Failed CHALLENGE attempt - missing secure connection by %s (%s@%s)",
	123	source_p->name, source_p->username, source_p->host);
	124	}
	125	return;
	126	}
	127
212380e3 AC	128	/* if theyre an oper, reprint oper motd and ignore */
	129	if(IsOper(source_p))
	130	{
	131	sendto_one(source_p, form_str(RPL_YOUREOPER), me.name, source_p->name);
	132	send_oper_motd(source_p);
3c7d6fcc	133	return;
212380e3 AC	134	}
	135
	136	if(*parv[1] == '+')
	137	{
	138	/* Ignore it if we aren't expecting this... -A1kmm */
	139	if(!source_p->localClient->challenge)
3c7d6fcc	140	return;
212380e3	141
e3354945	142	if((rb_current_time() - source_p->localClient->chal_time) > CHALLENGE_EXPIRES)
212380e3 AC	143	{
	144	sendto_one(source_p, form_str(ERR_PASSWDMISMATCH), me.name, source_p->name);
	145	ilog(L_FOPER, "EXPIRED CHALLENGE (%s) by (%s!%s@%s) (%s)",
ed3ca2ff	146	source_p->user->opername, source_p->name,
212380e3 AC	147	source_p->username, source_p->host, source_p->sockhost);
	148
	149	if(ConfigFileEntry.failed_oper_notice)
	150	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	151	"Expired CHALLENGE attempt by %s (%s@%s)",
	152	source_p->name, source_p->username,
	153	source_p->host);
	154	cleanup_challenge(source_p);
3c7d6fcc	155	return;
212380e3 AC	156	}
212380e3 AC	157
6493f05d EM	158	parv[1]++;
6493f05d EM	159	b_response = rb_base64_decode((const unsigned char *)parv[1], strlen(parv[1]), &len);
212380e3 AC	160
	161	if(len != SHA_DIGEST_LENGTH \|\|
	162	memcmp(source_p->localClient->challenge, b_response, SHA_DIGEST_LENGTH))
	163	{
	164	sendto_one(source_p, form_str(ERR_PASSWDMISMATCH), me.name, source_p->name);
	165	ilog(L_FOPER, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s)",
ed3ca2ff	166	source_p->user->opername, source_p->name,
212380e3 AC	167	source_p->username, source_p->host, source_p->sockhost);
	168
	169	if(ConfigFileEntry.failed_oper_notice)
	170	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	171	"Failed CHALLENGE attempt by %s (%s@%s)",
	172	source_p->name, source_p->username,
	173	source_p->host);
	174
637c4932	175	rb_free(b_response);
212380e3	176	cleanup_challenge(source_p);
3c7d6fcc	177	return;
212380e3 AC	178	}
212380e3 AC	179
637c4932	180	rb_free(b_response);
212380e3	181
55abcbb2 KB	182	oper_p = find_oper_conf(source_p->username, source_p->orighost,
55abcbb2 KB	183	source_p->sockhost,
ed3ca2ff	184	source_p->user->opername);
212380e3 AC	185
	186	if(oper_p == NULL)
	187	{
76169ea7	188	sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
212380e3	189	ilog(L_FOPER, "FAILED OPER (%s) by (%s!%s@%s) (%s)",
ed3ca2ff	190	source_p->user->opername, source_p->name,
212380e3 AC	191	source_p->username, source_p->host,
	192	source_p->sockhost);
	193
	194	if(ConfigFileEntry.failed_oper_notice)
	195	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	196	"Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
	197	source_p->name, source_p->username,
	198	source_p->host);
3c7d6fcc	199	return;
212380e3 AC	200	}
	201
	202	cleanup_challenge(source_p);
	203
	204	oper_up(source_p, oper_p);
	205
	206	ilog(L_OPERED, "OPER %s by %s!%s@%s (%s)",
ed3ca2ff	207	source_p->user->opername, source_p->name,
212380e3	208	source_p->username, source_p->host, source_p->sockhost);
3c7d6fcc	209	return;
212380e3 AC	210	}
	211
	212	cleanup_challenge(source_p);
	213
55abcbb2	214	oper_p = find_oper_conf(source_p->username, source_p->orighost,
212380e3 AC	215	source_p->sockhost, parv[1]);
	216
	217	if(oper_p == NULL)
	218	{
76169ea7	219	sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
212380e3 AC	220	ilog(L_FOPER, "FAILED OPER (%s) by (%s!%s@%s) (%s)",
	221	parv[1], source_p->name,
	222	source_p->username, source_p->host, source_p->sockhost);
	223
	224	if(ConfigFileEntry.failed_oper_notice)
	225	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	226	"Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
	227	source_p->name, source_p->username, source_p->host);
3c7d6fcc	228	return;
212380e3 AC	229	}
	230
	231	if(!oper_p->rsa_pubkey)
	232	{
5366977b	233	sendto_one_notice(source_p, ":I'm sorry, PK authentication is not enabled for your oper{} block.");
3c7d6fcc	234	return;
212380e3 AC	235	}
212380e3 AC	236
35eccf49	237	if(IsOperConfNeedSSL(oper_p) && !IsSecureClient(source_p))
b1594414	238	{
76169ea7	239	sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
b1594414 JT	240	ilog(L_FOPER, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s) -- requires SSL/TLS",
	241	parv[1], source_p->name, source_p->username, source_p->host,
	242	source_p->sockhost);
	243
	244	if(ConfigFileEntry.failed_oper_notice)
	245	{
a9227555	246	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
b1594414 JT	247	"Failed CHALLENGE attempt - missing SSL/TLS by %s (%s@%s)",
	248	source_p->name, source_p->username, source_p->host);
	249	}
3c7d6fcc	250	return;
b1594414 JT	251	}
b1594414 JT	252
ed8b3d69 AC	253	if (oper_p->certfp != NULL)
ed8b3d69 AC	254	{
f956cb0f	255	if (source_p->certfp == NULL \|\| rb_strcasecmp(source_p->certfp, oper_p->certfp))
ed8b3d69 AC	256	{
	257	sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
	258	ilog(L_FOPER, "FAILED OPER (%s) by (%s!%s@%s) (%s) -- client certificate fingerprint mismatch",
fad065bb	259	parv[1], source_p->name,
ed8b3d69 AC	260	source_p->username, source_p->host, source_p->sockhost);
	261
	262	if(ConfigFileEntry.failed_oper_notice)
	263	{
a9227555	264	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
ed8b3d69 AC	265	"Failed OPER attempt - client certificate fingerprint mismatch by %s (%s@%s)",
	266	source_p->name, source_p->username, source_p->host);
	267	}
3c7d6fcc	268	return;
ed8b3d69 AC	269	}
	270	}
	271
3c7d6fcc	272	if(generate_challenge(&challenge, &(source_p->localClient->challenge), oper_p->rsa_pubkey))
212380e3 AC	273	{
212380e3 AC	274	char *chal = challenge;
e3354945	275	source_p->localClient->chal_time = rb_current_time();
212380e3 AC	276	for(;;)
212380e3 AC	277	{
f427c8b0	278	cnt = rb_strlcpy(chal_line, chal, CHALLENGE_WIDTH);
212380e3 AC	279	sendto_one(source_p, form_str(RPL_RSACHALLENGE2), me.name, source_p->name, chal_line);
	280	if(cnt > CHALLENGE_WIDTH)
	281	chal += CHALLENGE_WIDTH - 1;
	282	else
	283	break;
55abcbb2	284
212380e3	285	}
55abcbb2	286	sendto_one(source_p, form_str(RPL_ENDOFRSACHALLENGE2),
212380e3	287	me.name, source_p->name);
637c4932	288	rb_free(challenge);
ed3ca2ff	289	source_p->user->opername = rb_strdup(oper_p->name);
212380e3 AC	290	}
	291	else
	292	sendto_one_notice(source_p, ":Failed to generate challenge.");
212380e3 AC	293	}
212380e3 AC	294
3c7d6fcc	295	static bool
212380e3 AC	296	generate_challenge(char r_challenge, char r_response, RSA * rsa)
	297	{
	298	SHA_CTX ctx;
	299	unsigned char secret[CHALLENGE_SECRET_LENGTH], *tmp;
	300	unsigned long length;
	301	unsigned long e = 0;
	302	unsigned long cnt = 0;
	303	int ret;
	304
	305	if(!rsa)
3c7d6fcc	306	return false;
f55930ac	307	if(rb_get_random(secret, CHALLENGE_SECRET_LENGTH))
212380e3 AC	308	{
212380e3 AC	309	SHA1_Init(&ctx);
f55930ac VY	310	SHA1_Update(&ctx, (uint8_t *)secret, CHALLENGE_SECRET_LENGTH);
	311	*r_response = malloc(SHA_DIGEST_LENGTH);
	312	SHA1_Final((uint8_t )r_response, &ctx);
212380e3 AC	313
212380e3 AC	314	length = RSA_size(rsa);
eddc2ab6	315	tmp = rb_malloc(length);
212380e3 AC	316	ret = RSA_public_encrypt(CHALLENGE_SECRET_LENGTH, secret, tmp, rsa, RSA_PKCS1_OAEP_PADDING);
212380e3 AC	317
f55930ac	318	if(ret >= 0)
212380e3	319	{
f55930ac	320	r_challenge = (char )rb_base64_encode(tmp, ret);
637c4932	321	rb_free(tmp);
3c7d6fcc	322	return true;
212380e3	323	}
f55930ac	324
637c4932 VY	325	rb_free(tmp);
637c4932 VY	326	rb_free(*r_response);
212380e3 AC	327	*r_response = NULL;
	328	}
	329
	330	ERR_load_crypto_strings();
	331	while ((cnt < 100) && (e = ERR_get_error()))
	332	{
	333	ilog(L_MAIN, "SSL error: %s", ERR_error_string(e, 0));
	334	cnt++;
	335	}
	336
3c7d6fcc	337	return false;
212380e3 AC	338	}
	339
	340	#endif /* HAVE_LIBCRYPTO */