[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(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
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	{
	175	sendto_one(source_p, form_str(ERR_NOOPERHOST),
	176	me.name, source_p->name);
	177	ilog(L_FOPER, "FAILED OPER (%s) by (%s!%s@%s) (%s)",
	178	source_p->localClient->opername, source_p->name,
	179	source_p->username, source_p->host,
	180	source_p->sockhost);
	181
	182	if(ConfigFileEntry.failed_oper_notice)
	183	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	184	"Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
	185	source_p->name, source_p->username,
	186	source_p->host);
	187	return 0;
	188	}
	189
	190	cleanup_challenge(source_p);
	191
	192	oper_up(source_p, oper_p);
	193
	194	ilog(L_OPERED, "OPER %s by %s!%s@%s (%s)",
	195	source_p->localClient->opername, source_p->name,
	196	source_p->username, source_p->host, source_p->sockhost);
	197	return 0;
	198	}
	199
	200	cleanup_challenge(source_p);
	201
	202	oper_p = find_oper_conf(source_p->username, source_p->orighost,
	203	source_p->sockhost, parv[1]);
	204
	205	if(oper_p == NULL)
	206	{
	207	sendto_one(source_p, form_str(ERR_NOOPERHOST), me.name, source_p->name);
	208	ilog(L_FOPER, "FAILED OPER (%s) by (%s!%s@%s) (%s)",
	209	parv[1], source_p->name,
	210	source_p->username, source_p->host, source_p->sockhost);
	211
	212	if(ConfigFileEntry.failed_oper_notice)
	213	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	214	"Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
	215	source_p->name, source_p->username, source_p->host);
	216	return 0;
	217	}
	218
	219	if(!oper_p->rsa_pubkey)
	220	{
5366977b	221	sendto_one_notice(source_p, ":I'm sorry, PK authentication is not enabled for your oper{} block.");
212380e3	222	return 0;
	223	}
	224
663bbb28 JT	225	if(IsOperConfNeedSSL(oper_p) && !IsSSLClient(source_p))
	226	{
	227	sendto_one(source_p, form_str(ERR_NOOPERHOST), me.name, source_p->name);
	228	ilog(L_FOPER, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s) -- requires SSL/TLS",
	229	parv[1], source_p->name, source_p->username, source_p->host,
	230	source_p->sockhost);
	231
	232	if(ConfigFileEntry.failed_oper_notice)
	233	{
	234	sendto_realops_snomask(SNO_GENERAL, L_ALL,
	235	"Failed CHALLENGE attempt - missing SSL/TLS by %s (%s@%s)",
	236	source_p->name, source_p->username, source_p->host);
	237	}
	238	return 0;
	239	}
	240
212380e3	241	if(!generate_challenge(&challenge, &(source_p->localClient->challenge), oper_p->rsa_pubkey))
	242	{
	243	char *chal = challenge;
9f6bbe3c	244	source_p->localClient->chal_time = rb_current_time();
212380e3	245	for(;;)
212380e3	246	{
907468c4	247	cnt = rb_strlcpy(chal_line, chal, CHALLENGE_WIDTH);
212380e3	248	sendto_one(source_p, form_str(RPL_RSACHALLENGE2), me.name, source_p->name, chal_line);
	249	if(cnt > CHALLENGE_WIDTH)
	250	chal += CHALLENGE_WIDTH - 1;
	251	else
	252	break;
	253
	254	}
	255	sendto_one(source_p, form_str(RPL_ENDOFRSACHALLENGE2),
	256	me.name, source_p->name);
90a3c35b	257	rb_free(challenge);
8e43b0b4	258	source_p->localClient->opername = rb_strdup(oper_p->name);
212380e3	259	}
	260	else
	261	sendto_one_notice(source_p, ":Failed to generate challenge.");
	262
	263	return 0;
	264	}
	265
212380e3	266	static int
	267	generate_challenge(char r_challenge, char r_response, RSA * rsa)
	268	{
	269	SHA_CTX ctx;
	270	unsigned char secret[CHALLENGE_SECRET_LENGTH], *tmp;
	271	unsigned long length;
	272	unsigned long e = 0;
	273	unsigned long cnt = 0;
	274	int ret;
	275
	276	if(!rsa)
	277	return -1;
26673969	278	if(rb_get_random(secret, CHALLENGE_SECRET_LENGTH))
212380e3	279	{
212380e3	280	SHA1_Init(&ctx);
26673969 VY	281	SHA1_Update(&ctx, (uint8_t *)secret, CHALLENGE_SECRET_LENGTH);
	282	*r_response = malloc(SHA_DIGEST_LENGTH);
	283	SHA1_Final((uint8_t )r_response, &ctx);
212380e3	284
212380e3	285	length = RSA_size(rsa);
8e43b0b4	286	tmp = rb_malloc(length);
212380e3	287	ret = RSA_public_encrypt(CHALLENGE_SECRET_LENGTH, secret, tmp, rsa, RSA_PKCS1_OAEP_PADDING);
212380e3	288
26673969	289	if(ret >= 0)
212380e3	290	{
26673969	291	r_challenge = (char )rb_base64_encode(tmp, ret);
90a3c35b	292	rb_free(tmp);
212380e3	293	return 0;
212380e3	294	}
26673969	295
90a3c35b VY	296	rb_free(tmp);
90a3c35b VY	297	rb_free(*r_response);
212380e3	298	*r_response = NULL;
	299	}
	300
	301	ERR_load_crypto_strings();
	302	while ((cnt < 100) && (e = ERR_get_error()))
	303	{
	304	ilog(L_MAIN, "SSL error: %s", ERR_error_string(e, 0));
	305	cnt++;
	306	}
	307
	308	return (-1);
	309	}
	310
	311	#endif /* HAVE_LIBCRYPTO */