328 lines
9.7 KiB
C
328 lines
9.7 KiB
C
/*
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* ircd-ratbox: A slightly useful ircd.
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* m_challenge.c: Allows an IRC Operator to securely authenticate.
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*
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* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
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* Copyright (C) 1996-2002 Hybrid Development Team
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* Copyright (C) 2002-2005 ircd-ratbox development team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*/
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#include "stdinc.h"
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#ifdef HAVE_LIBCRYPTO
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#include <openssl/pem.h>
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#include <openssl/rand.h>
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#include <openssl/rsa.h>
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#include <openssl/md5.h>
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#include <openssl/bn.h>
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#include <openssl/evp.h>
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#include <openssl/err.h>
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#endif
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#include "client.h"
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#include "ircd.h"
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#include "modules.h"
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#include "numeric.h"
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#include "send.h"
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#include "s_conf.h"
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#include "msg.h"
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#include "parse.h"
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#include "match.h"
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#include "logger.h"
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#include "s_user.h"
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#include "cache.h"
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#include "s_newconf.h"
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#define CHALLENGE_WIDTH BUFSIZE - (NICKLEN + HOSTLEN + 12)
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#define CHALLENGE_EXPIRES 180 /* 180 seconds should be more than long enough */
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#define CHALLENGE_SECRET_LENGTH 128 /* how long our challenge secret should be */
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#ifndef HAVE_LIBCRYPTO
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static const char challenge_desc[] = "Does nothing as OpenSSL was not enabled.";
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/* Maybe this should be an error or something?-davidt */
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/* now it is -larne */
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static int challenge_load(void)
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{
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sendto_realops_snomask(SNO_GENERAL, L_ALL,
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"Challenge module not loaded because OpenSSL is not available.");
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ilog(L_MAIN, "Challenge module not loaded because OpenSSL is not available.");
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return -1;
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}
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DECLARE_MODULE_AV2(challenge, challenge_load, NULL, NULL, NULL, NULL, NULL, NULL, challenge_desc);
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#else
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static const char challenge_desc[] =
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"Provides the challenge-response facility used for becoming an IRC operator";
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static void m_challenge(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
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/* We have openssl support, so include /CHALLENGE */
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struct Message challenge_msgtab = {
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"CHALLENGE", 0, 0, 0, 0,
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{mg_unreg, {m_challenge, 2}, mg_ignore, mg_ignore, mg_ignore, {m_challenge, 2}}
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};
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mapi_clist_av1 challenge_clist[] = { &challenge_msgtab, NULL };
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DECLARE_MODULE_AV2(challenge, NULL, NULL, challenge_clist, NULL, NULL, NULL, NULL, challenge_desc);
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static bool generate_challenge(char **r_challenge, char **r_response, RSA * key);
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static void
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cleanup_challenge(struct Client *target_p)
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{
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if(target_p->localClient == NULL)
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return;
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rb_free(target_p->localClient->challenge);
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rb_free(target_p->user->opername);
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target_p->localClient->challenge = NULL;
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target_p->user->opername = NULL;
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target_p->localClient->chal_time = 0;
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}
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/*
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* m_challenge - generate RSA challenge for wouldbe oper
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* parv[1] = operator to challenge for, or +response
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*/
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static void
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m_challenge(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
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{
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struct oper_conf *oper_p;
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char *challenge = NULL; /* to placate gcc */
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char chal_line[CHALLENGE_WIDTH];
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unsigned char *b_response;
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size_t cnt;
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int len = 0;
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/* if theyre an oper, reprint oper motd and ignore */
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if(IsOper(source_p))
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{
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sendto_one(source_p, form_str(RPL_YOUREOPER), me.name, source_p->name);
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send_oper_motd(source_p);
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return;
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}
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if(*parv[1] == '+')
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{
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/* Ignore it if we aren't expecting this... -A1kmm */
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if(!source_p->localClient->challenge)
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return;
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if((rb_current_time() - source_p->localClient->chal_time) > CHALLENGE_EXPIRES)
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{
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sendto_one(source_p, form_str(ERR_PASSWDMISMATCH), me.name, source_p->name);
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ilog(L_FOPER, "EXPIRED CHALLENGE (%s) by (%s!%s@%s) (%s)",
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source_p->user->opername, source_p->name,
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source_p->username, source_p->host, source_p->sockhost);
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if(ConfigFileEntry.failed_oper_notice)
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sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
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"Expired CHALLENGE attempt by %s (%s@%s)",
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source_p->name, source_p->username,
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source_p->host);
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cleanup_challenge(source_p);
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return;
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}
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parv[1]++;
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b_response = rb_base64_decode((const unsigned char *)parv[1], strlen(parv[1]), &len);
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if(len != SHA_DIGEST_LENGTH ||
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memcmp(source_p->localClient->challenge, b_response, SHA_DIGEST_LENGTH))
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{
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sendto_one(source_p, form_str(ERR_PASSWDMISMATCH), me.name, source_p->name);
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ilog(L_FOPER, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s)",
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source_p->user->opername, source_p->name,
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source_p->username, source_p->host, source_p->sockhost);
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if(ConfigFileEntry.failed_oper_notice)
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sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
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"Failed CHALLENGE attempt by %s (%s@%s)",
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source_p->name, source_p->username,
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source_p->host);
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rb_free(b_response);
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cleanup_challenge(source_p);
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return;
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}
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rb_free(b_response);
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oper_p = find_oper_conf(source_p->username, source_p->orighost,
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source_p->sockhost,
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source_p->user->opername);
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if(oper_p == NULL)
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{
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sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
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ilog(L_FOPER, "FAILED OPER (%s) by (%s!%s@%s) (%s)",
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source_p->user->opername, source_p->name,
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source_p->username, source_p->host,
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source_p->sockhost);
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if(ConfigFileEntry.failed_oper_notice)
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sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
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"Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
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source_p->name, source_p->username,
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source_p->host);
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return;
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}
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cleanup_challenge(source_p);
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oper_up(source_p, oper_p);
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ilog(L_OPERED, "OPER %s by %s!%s@%s (%s)",
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source_p->user->opername, source_p->name,
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source_p->username, source_p->host, source_p->sockhost);
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return;
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}
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cleanup_challenge(source_p);
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oper_p = find_oper_conf(source_p->username, source_p->orighost,
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source_p->sockhost, parv[1]);
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if(oper_p == NULL)
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{
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sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
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ilog(L_FOPER, "FAILED OPER (%s) by (%s!%s@%s) (%s)",
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parv[1], source_p->name,
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source_p->username, source_p->host, source_p->sockhost);
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if(ConfigFileEntry.failed_oper_notice)
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sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
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"Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
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source_p->name, source_p->username, source_p->host);
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return;
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}
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if(!oper_p->rsa_pubkey)
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{
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sendto_one_notice(source_p, ":I'm sorry, PK authentication is not enabled for your oper{} block.");
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return;
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}
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if(IsOperConfNeedSSL(oper_p) && !IsSecureClient(source_p))
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{
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sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
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ilog(L_FOPER, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s) -- requires SSL/TLS",
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parv[1], source_p->name, source_p->username, source_p->host,
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source_p->sockhost);
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if(ConfigFileEntry.failed_oper_notice)
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{
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sendto_realops_snomask(SNO_GENERAL, L_ALL,
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"Failed CHALLENGE attempt - missing SSL/TLS by %s (%s@%s)",
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source_p->name, source_p->username, source_p->host);
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}
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return;
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}
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if (oper_p->certfp != NULL)
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{
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if (source_p->certfp == NULL || rb_strcasecmp(source_p->certfp, oper_p->certfp))
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{
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sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
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ilog(L_FOPER, "FAILED OPER (%s) by (%s!%s@%s) (%s) -- client certificate fingerprint mismatch",
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parv[1], source_p->name,
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source_p->username, source_p->host, source_p->sockhost);
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if(ConfigFileEntry.failed_oper_notice)
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{
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sendto_realops_snomask(SNO_GENERAL, L_ALL,
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"Failed OPER attempt - client certificate fingerprint mismatch by %s (%s@%s)",
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source_p->name, source_p->username, source_p->host);
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}
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return;
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}
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}
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if(generate_challenge(&challenge, &(source_p->localClient->challenge), oper_p->rsa_pubkey))
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{
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char *chal = challenge;
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source_p->localClient->chal_time = rb_current_time();
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for(;;)
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{
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cnt = rb_strlcpy(chal_line, chal, CHALLENGE_WIDTH);
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sendto_one(source_p, form_str(RPL_RSACHALLENGE2), me.name, source_p->name, chal_line);
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if(cnt > CHALLENGE_WIDTH)
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chal += CHALLENGE_WIDTH - 1;
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else
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break;
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}
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sendto_one(source_p, form_str(RPL_ENDOFRSACHALLENGE2),
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me.name, source_p->name);
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rb_free(challenge);
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source_p->user->opername = rb_strdup(oper_p->name);
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}
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else
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sendto_one_notice(source_p, ":Failed to generate challenge.");
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}
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static bool
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generate_challenge(char **r_challenge, char **r_response, RSA * rsa)
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{
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SHA_CTX ctx;
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unsigned char secret[CHALLENGE_SECRET_LENGTH], *tmp;
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unsigned long length;
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unsigned long e = 0;
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unsigned long cnt = 0;
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int ret;
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if(!rsa)
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return false;
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if(rb_get_random(secret, CHALLENGE_SECRET_LENGTH))
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{
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SHA1_Init(&ctx);
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SHA1_Update(&ctx, (uint8_t *)secret, CHALLENGE_SECRET_LENGTH);
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*r_response = malloc(SHA_DIGEST_LENGTH);
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SHA1_Final((uint8_t *)*r_response, &ctx);
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length = RSA_size(rsa);
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tmp = rb_malloc(length);
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ret = RSA_public_encrypt(CHALLENGE_SECRET_LENGTH, secret, tmp, rsa, RSA_PKCS1_OAEP_PADDING);
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if(ret >= 0)
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{
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*r_challenge = (char *)rb_base64_encode(tmp, ret);
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rb_free(tmp);
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return true;
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}
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rb_free(tmp);
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rb_free(*r_response);
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*r_response = NULL;
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}
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ERR_load_crypto_strings();
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while ((cnt < 100) && (e = ERR_get_error()))
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{
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ilog(L_MAIN, "SSL error: %s", ERR_error_string(e, 0));
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cnt++;
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}
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return false;
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}
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#endif /* HAVE_LIBCRYPTO */
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