[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/err.h>
#  include <openssl/evp.h>
#  include <openssl/pem.h>
#  include <openssl/rsa.h>
#  include <openssl/sha.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);

#if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
static bool generate_challenge(char **r_challenge, unsigned char **r_response, EVP_PKEY *key);
#else
static bool generate_challenge(char **r_challenge, unsigned char **r_response, RSA *key);
#endif

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 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 - host mismatch by %s (%s@%s)",
						     source_p->name, source_p->username,
						     source_p->host);
			cleanup_challenge(source_p);
			return;
		}

		cleanup_challenge(source_p);

		oper_up(source_p, oper_p);

		ilog(L_OPERED, "CHALLENGE %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 CHALLENGE (%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 - user@host mismatch or no operator block for %s by %s (%s@%s)",
					     parv[1], 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 CHALLENGE (%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 CHALLENGE 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
#if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
generate_challenge(char **r_challenge, unsigned char **r_response, EVP_PKEY *key)
#else
generate_challenge(char **r_challenge, unsigned char **r_response, RSA *key)
#endif
{
	unsigned char secret[CHALLENGE_SECRET_LENGTH];
	unsigned char *tmp = NULL;
	unsigned long e = 0;
	unsigned long cnt = 0;
	bool retval = false;
	size_t length;
	EVP_MD_CTX *mctx = NULL;
#if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
	EVP_PKEY_CTX *pctx = NULL;
#endif

	if(!rb_get_random(secret, sizeof secret))
		return false;

	if((*r_response = rb_malloc(SHA_DIGEST_LENGTH)) == NULL)
		return false;

	if((mctx = EVP_MD_CTX_new()) == NULL)
		goto fail;

	if(EVP_DigestInit(mctx, EVP_sha1()) < 1)
		goto fail;

	if(EVP_DigestUpdate(mctx, secret, sizeof secret) < 1)
		goto fail;

	if(EVP_DigestFinal(mctx, *r_response, NULL) < 1)
		goto fail;

#if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
	if((length = (size_t) EVP_PKEY_get_size(key)) < 1)
		goto fail;

	if((tmp = rb_malloc(length)) == NULL)
		goto fail;

	if((pctx = EVP_PKEY_CTX_new(key, NULL)) == NULL)
		goto fail;

	if(EVP_PKEY_encrypt_init(pctx) < 1)
		goto fail;

	if(EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_OAEP_PADDING) < 1)
		goto fail;

	if(EVP_PKEY_encrypt(pctx, tmp, &length, secret, sizeof secret) < 1)
		goto fail;
#else
	if((length = (size_t) RSA_size(key)) < 1)
		goto fail;

	if((tmp = rb_malloc(length)) == NULL)
		goto fail;

	if(RSA_public_encrypt(sizeof secret, secret, tmp, key, RSA_PKCS1_OAEP_PADDING) < 1)
		goto fail;
#endif

	if((*r_challenge = (char *) rb_base64_encode(tmp, (int) length)) == NULL)
		goto fail;

	retval = true;
	goto done;

fail:
	while ((cnt < 100) && (e = ERR_get_error()))
	{
		ilog(L_MAIN, "OpenSSL Error (CHALLENGE): %s", ERR_error_string(e, 0));
		cnt++;
	}

	rb_free(*r_response);
	*r_response = NULL;

done:
	EVP_MD_CTX_free(mctx);
#if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
	EVP_PKEY_CTX_free(pctx);
#endif
	rb_free(tmp);

	return retval;
}

#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
8e9a7418	28	# include <openssl/err.h>
	29	# include <openssl/evp.h>
	30	# include <openssl/pem.h>
	31	# include <openssl/rsa.h>
	32	# include <openssl/sha.h>
212380e3 AC	33	#endif
212380e3 AC	34
212380e3 AC	35	#include "client.h"
	36	#include "ircd.h"
	37	#include "modules.h"
	38	#include "numeric.h"
	39	#include "send.h"
	40	#include "s_conf.h"
	41	#include "msg.h"
	42	#include "parse.h"
4562c604	43	#include "match.h"
4016731b	44	#include "logger.h"
212380e3 AC	45	#include "s_user.h"
	46	#include "cache.h"
	47	#include "s_newconf.h"
	48
	49	#define CHALLENGE_WIDTH BUFSIZE - (NICKLEN + HOSTLEN + 12)
	50	#define CHALLENGE_EXPIRES 180 /* 180 seconds should be more than long enough */
	51	#define CHALLENGE_SECRET_LENGTH 128 /* how long our challenge secret should be */
	52
	53	#ifndef HAVE_LIBCRYPTO
eeabf33a EM	54
	55	static const char challenge_desc[] = "Does nothing as OpenSSL was not enabled.";
	56
212380e3 AC	57	/* Maybe this should be an error or something?-davidt */
212380e3 AC	58	/* now it is -larne */
eeabf33a	59	static int challenge_load(void)
212380e3	60	{
a9227555	61	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
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;
212380e3 AC	65	}
212380e3 AC	66
5544da98	67	DECLARE_MODULE_AV2(challenge, challenge_load, NULL, NULL, NULL, NULL, NULL, NULL, challenge_desc);
212380e3 AC	68	#else
212380e3 AC	69
eeabf33a EM	70	static const char challenge_desc[] =
	71	"Provides the challenge-response facility used for becoming an IRC operator";
	72
3c7d6fcc	73	static void m_challenge(struct MsgBuf , struct Client , struct Client , int, const char *);
212380e3 AC	74
	75	/* We have openssl support, so include /CHALLENGE */
	76	struct Message challenge_msgtab = {
7baa37a9	77	"CHALLENGE", 0, 0, 0, 0,
212380e3 AC	78	{mg_unreg, {m_challenge, 2}, mg_ignore, mg_ignore, mg_ignore, {m_challenge, 2}}
	79	};
	80
	81	mapi_clist_av1 challenge_clist[] = { &challenge_msgtab, NULL };
5544da98	82
5544da98	83	DECLARE_MODULE_AV2(challenge, NULL, NULL, challenge_clist, NULL, NULL, NULL, NULL, challenge_desc);
212380e3	84
8e9a7418	85	#if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
	86	static bool generate_challenge(char r_challenge, unsigned char r_response, EVP_PKEY *key);
	87	#else
	88	static bool generate_challenge(char r_challenge, unsigned char r_response, RSA *key);
	89	#endif
212380e3 AC	90
	91	static void
	92	cleanup_challenge(struct Client *target_p)
	93	{
	94	if(target_p->localClient == NULL)
	95	return;
55abcbb2	96
637c4932	97	rb_free(target_p->localClient->challenge);
ed3ca2ff	98	rb_free(target_p->user->opername);
212380e3	99	target_p->localClient->challenge = NULL;
ed3ca2ff	100	target_p->user->opername = NULL;
212380e3 AC	101	target_p->localClient->chal_time = 0;
	102	}
	103
	104	/*
	105	* m_challenge - generate RSA challenge for wouldbe oper
212380e3	106	* parv[1] = operator to challenge for, or +response
212380e3	107	*/
3c7d6fcc	108	static void
428ca87b	109	m_challenge(struct MsgBuf msgbuf_p, struct Client client_p, struct Client source_p, int parc, const char parv[])
212380e3 AC	110	{
	111	struct oper_conf *oper_p;
	112	char challenge = NULL; / to placate gcc */
55abcbb2	113	char chal_line[CHALLENGE_WIDTH];
212380e3 AC	114	unsigned char *b_response;
	115	size_t cnt;
	116	int len = 0;
	117
40ecb85a	118	if (ConfigFileEntry.oper_secure_only && !IsSecureClient(source_p))
	119	{
	120	sendto_one_notice(source_p, ":You must be using a secure connection to /CHALLENGE on this server");
	121	if (ConfigFileEntry.failed_oper_notice)
	122	{
	123	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	124	"Failed CHALLENGE attempt - missing secure connection by %s (%s@%s)",
	125	source_p->name, source_p->username, source_p->host);
	126	}
	127	return;
	128	}
	129
212380e3 AC	130	/* if theyre an oper, reprint oper motd and ignore */
	131	if(IsOper(source_p))
	132	{
	133	sendto_one(source_p, form_str(RPL_YOUREOPER), me.name, source_p->name);
	134	send_oper_motd(source_p);
3c7d6fcc	135	return;
212380e3 AC	136	}
	137
	138	if(*parv[1] == '+')
	139	{
	140	/* Ignore it if we aren't expecting this... -A1kmm */
	141	if(!source_p->localClient->challenge)
3c7d6fcc	142	return;
212380e3	143
e3354945	144	if((rb_current_time() - source_p->localClient->chal_time) > CHALLENGE_EXPIRES)
212380e3 AC	145	{
	146	sendto_one(source_p, form_str(ERR_PASSWDMISMATCH), me.name, source_p->name);
	147	ilog(L_FOPER, "EXPIRED CHALLENGE (%s) by (%s!%s@%s) (%s)",
ed3ca2ff	148	source_p->user->opername, source_p->name,
212380e3 AC	149	source_p->username, source_p->host, source_p->sockhost);
	150
	151	if(ConfigFileEntry.failed_oper_notice)
	152	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	153	"Expired CHALLENGE attempt by %s (%s@%s)",
	154	source_p->name, source_p->username,
	155	source_p->host);
	156	cleanup_challenge(source_p);
3c7d6fcc	157	return;
212380e3 AC	158	}
212380e3 AC	159
6493f05d EM	160	parv[1]++;
6493f05d EM	161	b_response = rb_base64_decode((const unsigned char *)parv[1], strlen(parv[1]), &len);
212380e3 AC	162
	163	if(len != SHA_DIGEST_LENGTH \|\|
	164	memcmp(source_p->localClient->challenge, b_response, SHA_DIGEST_LENGTH))
	165	{
	166	sendto_one(source_p, form_str(ERR_PASSWDMISMATCH), me.name, source_p->name);
	167	ilog(L_FOPER, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s)",
ed3ca2ff	168	source_p->user->opername, source_p->name,
212380e3 AC	169	source_p->username, source_p->host, source_p->sockhost);
	170
	171	if(ConfigFileEntry.failed_oper_notice)
	172	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	173	"Failed CHALLENGE attempt by %s (%s@%s)",
	174	source_p->name, source_p->username,
	175	source_p->host);
	176
637c4932	177	rb_free(b_response);
212380e3	178	cleanup_challenge(source_p);
3c7d6fcc	179	return;
212380e3 AC	180	}
212380e3 AC	181
637c4932	182	rb_free(b_response);
212380e3	183
55abcbb2 KB	184	oper_p = find_oper_conf(source_p->username, source_p->orighost,
55abcbb2 KB	185	source_p->sockhost,
ed3ca2ff	186	source_p->user->opername);
212380e3 AC	187
	188	if(oper_p == NULL)
	189	{
76169ea7	190	sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
c7905202	191	ilog(L_FOPER, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s)",
ed3ca2ff	192	source_p->user->opername, source_p->name,
212380e3 AC	193	source_p->username, source_p->host,
	194	source_p->sockhost);
	195
	196	if(ConfigFileEntry.failed_oper_notice)
	197	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
	198	"Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
	199	source_p->name, source_p->username,
	200	source_p->host);
73520cd1	201	cleanup_challenge(source_p);
3c7d6fcc	202	return;
212380e3 AC	203	}
	204
	205	cleanup_challenge(source_p);
	206
	207	oper_up(source_p, oper_p);
	208
c7905202	209	ilog(L_OPERED, "CHALLENGE %s by %s!%s@%s (%s)",
ed3ca2ff	210	source_p->user->opername, source_p->name,
212380e3	211	source_p->username, source_p->host, source_p->sockhost);
3c7d6fcc	212	return;
212380e3 AC	213	}
	214
	215	cleanup_challenge(source_p);
	216
55abcbb2	217	oper_p = find_oper_conf(source_p->username, source_p->orighost,
212380e3 AC	218	source_p->sockhost, parv[1]);
	219
	220	if(oper_p == NULL)
	221	{
76169ea7	222	sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
c7905202	223	ilog(L_FOPER, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s)",
212380e3 AC	224	parv[1], source_p->name,
	225	source_p->username, source_p->host, source_p->sockhost);
	226
	227	if(ConfigFileEntry.failed_oper_notice)
	228	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
3b24363e AJ	229	"Failed CHALLENGE attempt - user@host mismatch or no operator block for %s by %s (%s@%s)",
3b24363e AJ	230	parv[1], source_p->name, source_p->username, source_p->host);
3c7d6fcc	231	return;
212380e3 AC	232	}
	233
	234	if(!oper_p->rsa_pubkey)
	235	{
5366977b	236	sendto_one_notice(source_p, ":I'm sorry, PK authentication is not enabled for your oper{} block.");
3c7d6fcc	237	return;
212380e3 AC	238	}
212380e3 AC	239
35eccf49	240	if(IsOperConfNeedSSL(oper_p) && !IsSecureClient(source_p))
b1594414	241	{
76169ea7	242	sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
b1594414 JT	243	ilog(L_FOPER, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s) -- requires SSL/TLS",
	244	parv[1], source_p->name, source_p->username, source_p->host,
	245	source_p->sockhost);
	246
	247	if(ConfigFileEntry.failed_oper_notice)
	248	{
a9227555	249	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
b1594414 JT	250	"Failed CHALLENGE attempt - missing SSL/TLS by %s (%s@%s)",
	251	source_p->name, source_p->username, source_p->host);
	252	}
3c7d6fcc	253	return;
b1594414 JT	254	}
b1594414 JT	255
ed8b3d69 AC	256	if (oper_p->certfp != NULL)
ed8b3d69 AC	257	{
f956cb0f	258	if (source_p->certfp == NULL \|\| rb_strcasecmp(source_p->certfp, oper_p->certfp))
ed8b3d69 AC	259	{
ed8b3d69 AC	260	sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
c7905202	261	ilog(L_FOPER, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s) -- client certificate fingerprint mismatch",
fad065bb	262	parv[1], source_p->name,
ed8b3d69 AC	263	source_p->username, source_p->host, source_p->sockhost);
	264
	265	if(ConfigFileEntry.failed_oper_notice)
	266	{
a9227555	267	sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
c7905202	268	"Failed CHALLENGE attempt - client certificate fingerprint mismatch by %s (%s@%s)",
ed8b3d69 AC	269	source_p->name, source_p->username, source_p->host);
ed8b3d69 AC	270	}
3c7d6fcc	271	return;
ed8b3d69 AC	272	}
	273	}
	274
3c7d6fcc	275	if(generate_challenge(&challenge, &(source_p->localClient->challenge), oper_p->rsa_pubkey))
212380e3 AC	276	{
212380e3 AC	277	char *chal = challenge;
e3354945	278	source_p->localClient->chal_time = rb_current_time();
212380e3 AC	279	for(;;)
212380e3 AC	280	{
f427c8b0	281	cnt = rb_strlcpy(chal_line, chal, CHALLENGE_WIDTH);
212380e3	282	sendto_one(source_p, form_str(RPL_RSACHALLENGE2), me.name, source_p->name, chal_line);
73520cd1	283	if(cnt >= CHALLENGE_WIDTH)
212380e3 AC	284	chal += CHALLENGE_WIDTH - 1;
	285	else
	286	break;
55abcbb2	287
212380e3	288	}
55abcbb2	289	sendto_one(source_p, form_str(RPL_ENDOFRSACHALLENGE2),
212380e3	290	me.name, source_p->name);
637c4932	291	rb_free(challenge);
ed3ca2ff	292	source_p->user->opername = rb_strdup(oper_p->name);
212380e3 AC	293	}
	294	else
	295	sendto_one_notice(source_p, ":Failed to generate challenge.");
212380e3 AC	296	}
212380e3 AC	297
3c7d6fcc	298	static bool
8e9a7418	299	#if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
	300	generate_challenge(char r_challenge, unsigned char r_response, EVP_PKEY *key)
	301	#else
	302	generate_challenge(char r_challenge, unsigned char r_response, RSA *key)
	303	#endif
212380e3	304	{
8e9a7418	305	unsigned char secret[CHALLENGE_SECRET_LENGTH];
8e9a7418	306	unsigned char *tmp = NULL;
212380e3 AC	307	unsigned long e = 0;
212380e3 AC	308	unsigned long cnt = 0;
8e9a7418	309	bool retval = false;
	310	size_t length;
	311	EVP_MD_CTX *mctx = NULL;
	312	#if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
	313	EVP_PKEY_CTX *pctx = NULL;
	314	#endif
212380e3	315
8e9a7418	316	if(!rb_get_random(secret, sizeof secret))
	317	return false;
	318
	319	if((*r_response = rb_malloc(SHA_DIGEST_LENGTH)) == NULL)
3c7d6fcc	320	return false;
212380e3	321
8e9a7418	322	if((mctx = EVP_MD_CTX_new()) == NULL)
8e9a7418	323	goto fail;
212380e3	324
8e9a7418	325	if(EVP_DigestInit(mctx, EVP_sha1()) < 1)
8e9a7418	326	goto fail;
f55930ac	327
8e9a7418	328	if(EVP_DigestUpdate(mctx, secret, sizeof secret) < 1)
	329	goto fail;
	330
	331	if(EVP_DigestFinal(mctx, *r_response, NULL) < 1)
	332	goto fail;
	333
	334	#if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
	335	if((length = (size_t) EVP_PKEY_get_size(key)) < 1)
	336	goto fail;
	337
	338	if((tmp = rb_malloc(length)) == NULL)
	339	goto fail;
212380e3	340
8e9a7418	341	if((pctx = EVP_PKEY_CTX_new(key, NULL)) == NULL)
	342	goto fail;
	343
	344	if(EVP_PKEY_encrypt_init(pctx) < 1)
	345	goto fail;
	346
	347	if(EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_OAEP_PADDING) < 1)
	348	goto fail;
	349
	350	if(EVP_PKEY_encrypt(pctx, tmp, &length, secret, sizeof secret) < 1)
	351	goto fail;
	352	#else
	353	if((length = (size_t) RSA_size(key)) < 1)
	354	goto fail;
	355
	356	if((tmp = rb_malloc(length)) == NULL)
	357	goto fail;
	358
	359	if(RSA_public_encrypt(sizeof secret, secret, tmp, key, RSA_PKCS1_OAEP_PADDING) < 1)
	360	goto fail;
	361	#endif
	362
	363	if((r_challenge = (char ) rb_base64_encode(tmp, (int) length)) == NULL)
	364	goto fail;
	365
	366	retval = true;
	367	goto done;
	368
	369	fail:
212380e3 AC	370	while ((cnt < 100) && (e = ERR_get_error()))
212380e3 AC	371	{
8e9a7418	372	ilog(L_MAIN, "OpenSSL Error (CHALLENGE): %s", ERR_error_string(e, 0));
212380e3 AC	373	cnt++;
	374	}
	375
8e9a7418	376	rb_free(*r_response);
	377	*r_response = NULL;
	378
	379	done:
	380	EVP_MD_CTX_free(mctx);
	381	#if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
	382	EVP_PKEY_CTX_free(pctx);
	383	#endif
	384	rb_free(tmp);
	385
	386	return retval;
212380e3 AC	387	}
	388
	389	#endif /* HAVE_LIBCRYPTO */