525 lines
14 KiB
C
525 lines
14 KiB
C
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/*
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* ircd-ratbox: A slightly useful ircd.
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* m_oper.c: Makes a user an IRC Operator.
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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) 2002-2012 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
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* USA
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*
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* $Id: m_oper.c 27437 2013-02-02 20:33:47Z jilles $
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*/
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#include "stdinc.h"
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#ifdef USE_CHALLENGE
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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/sha.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 "struct.h"
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#include "client.h"
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#include "match.h"
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#include "ircd.h"
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#include "numeric.h"
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#include "s_conf.h"
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#include "s_newconf.h"
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#include "s_log.h"
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#include "s_user.h"
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#include "send.h"
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#include "parse.h"
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#include "modules.h"
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#include "cache.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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static int m_oper(struct Client *, struct Client *, int, const char **);
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static int oper_up(struct Client *source_p, struct oper_conf *oper_p);
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static int match_oper_password(const char *password, struct oper_conf *oper_p);
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static void send_oper_motd(struct Client *source_p);
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struct Message oper_msgtab = {
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"OPER", 0, 0, 0, MFLG_SLOW,
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{mg_unreg, {m_oper, 3}, mg_ignore, mg_ignore, mg_ignore, {m_oper, 3}}
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};
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static int m_challenge(struct Client *, struct Client *, int, const char **);
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struct Message challenge_msgtab = {
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"CHALLENGE", 0, 0, 0, MFLG_SLOW,
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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 oper_clist[] = { &oper_msgtab, &challenge_msgtab, NULL };
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DECLARE_MODULE_AV1(oper, NULL, NULL, oper_clist, NULL, NULL, "$Revision: 27437 $");
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/*
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* m_oper
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* parv[0] = sender prefix
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* parv[1] = oper name
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* parv[2] = oper password
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*/
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static int
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m_oper(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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const char *name;
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const char *password;
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name = parv[1];
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password = parv[2];
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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 0;
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}
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/* end the grace period */
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if(!IsFloodDone(source_p))
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flood_endgrace(source_p);
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oper_p = find_oper_conf(source_p->username, source_p->host, source_p->sockhost, name);
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if(oper_p == NULL)
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{
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sendto_one(source_p, form_str(ERR_NOOPERHOST), me.name, source_p->name);
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ilog(L_FOPER, "FAILED OPER (%s) by (%s!%s@%s)",
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name, source_p->name, source_p->username, source_p->host);
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if(ConfigFileEntry.failed_oper_notice)
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{
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sendto_realops_flags(UMODE_ALL, L_ALL,
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"Failed OPER attempt - host 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 0;
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}
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if(IsOperConfNeedSSL(oper_p) && !IsSSL(source_p))
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{
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sendto_one(source_p, form_str(ERR_NOOPERHOST), me.name, source_p->name);
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ilog(L_FOPER, "FAILED OPER (%s) by (%s!%s@%s) -- requires SSL/TLS",
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name, source_p->name, source_p->username, source_p->host);
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if(ConfigFileEntry.failed_oper_notice)
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{
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sendto_realops_flags(UMODE_ALL, L_ALL,
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"Failed OPER 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 0;
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}
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if(match_oper_password(password, oper_p))
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{
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oper_up(source_p, oper_p);
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ilog(L_OPERED, "OPER %s by %s!%s@%s",
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name, source_p->name, source_p->username, source_p->host);
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return 0;
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}
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else
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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 OPER (%s) by (%s!%s@%s)",
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name, source_p->name, source_p->username, source_p->host);
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if(ConfigFileEntry.failed_oper_notice)
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{
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sendto_realops_flags(UMODE_ALL, L_ALL,
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"Failed OPER attempt 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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}
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return 0;
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}
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/* send_oper_motd()
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*
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* inputs - client to send motd to
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* outputs - client is sent oper motd if exists
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* side effects -
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*/
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static void
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send_oper_motd(struct Client *source_p)
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{
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struct cacheline *lineptr;
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rb_dlink_node *ptr;
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if(oper_motd == NULL || rb_dlink_list_length(&oper_motd->contents) == 0)
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return;
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SetCork(source_p);
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sendto_one(source_p, form_str(RPL_OMOTDSTART), me.name, source_p->name);
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RB_DLINK_FOREACH(ptr, oper_motd->contents.head)
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{
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lineptr = ptr->data;
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sendto_one(source_p, form_str(RPL_OMOTD), me.name, source_p->name, lineptr->data);
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}
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ClearCork(source_p);
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sendto_one(source_p, form_str(RPL_ENDOFOMOTD), me.name, source_p->name);
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}
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/*
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* match_oper_password
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*
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* inputs - pointer to given password
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* - pointer to Conf
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* output - YES or NO if match
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* side effects - none
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*/
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static int
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match_oper_password(const char *password, struct oper_conf *oper_p)
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{
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const char *encr;
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/* passwd may be NULL pointer. Head it off at the pass... */
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if(EmptyString(oper_p->passwd))
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return NO;
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if(IsOperConfEncrypted(oper_p))
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{
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/* use first two chars of the password they send in as salt */
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/* If the password in the conf is MD5, and ircd is linked
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* to scrypt on FreeBSD, or the standard crypt library on
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* glibc Linux, then this code will work fine on generating
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* the proper encrypted hash for comparison.
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*/
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if(!EmptyString(password))
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encr = rb_crypt(password, oper_p->passwd);
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else
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encr = "";
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}
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else
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encr = password;
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if(strcmp(encr, oper_p->passwd) == 0)
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return YES;
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else
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return NO;
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}
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/* oper_up()
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*
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* inputs - pointer to given client to oper
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* - pointer to ConfItem to use
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* output - none
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* side effects - opers up source_p using aconf for reference
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*/
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static int
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oper_up(struct Client *source_p, struct oper_conf *oper_p)
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{
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int old = (source_p->umodes & ALL_UMODES);
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SetOper(source_p);
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if(oper_p->umodes)
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source_p->umodes |= oper_p->umodes & ALL_UMODES;
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else if(ConfigFileEntry.oper_umodes)
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source_p->umodes |= ConfigFileEntry.oper_umodes & ALL_UMODES;
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else
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source_p->umodes |= DEFAULT_OPER_UMODES & ALL_UMODES;
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Count.oper++;
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SetExemptKline(source_p);
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source_p->operflags |= oper_p->flags;
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source_p->localClient->opername = rb_strdup(oper_p->name);
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rb_dlinkAddAlloc(source_p, &oper_list);
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if(IsOperAdmin(source_p) && !IsOperHiddenAdmin(source_p))
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source_p->umodes |= UMODE_ADMIN;
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if(!IsOperN(source_p))
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source_p->umodes &= ~UMODE_NCHANGE;
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if(!IsOperOperwall(source_p))
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source_p->umodes &= ~UMODE_OPERWALL;
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sendto_realops_flags(UMODE_ALL, L_ALL,
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"%s (%s@%s) is now an operator", source_p->name,
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source_p->username, source_p->host);
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if(!(old & UMODE_INVISIBLE) && IsInvisible(source_p))
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++Count.invisi;
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if((old & UMODE_INVISIBLE) && !IsInvisible(source_p))
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--Count.invisi;
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send_umode_out(source_p, source_p, old);
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sendto_one(source_p, form_str(RPL_YOUREOPER), me.name, source_p->name);
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sendto_one_notice(source_p, ":*** Oper privs are %s", get_oper_privs(oper_p->flags));
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send_oper_motd(source_p);
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return (1);
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}
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#ifndef USE_CHALLENGE
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static int
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m_challenge(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
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{
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sendto_one_notice(source_p, ":Challenge not implemented");
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return 0;
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}
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#else
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static int generate_challenge(uint8_t **r_challenge, uint8_t **r_response, RSA * rsa);
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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->chal_resp);
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rb_free(target_p->localClient->opername);
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target_p->localClient->chal_resp = NULL;
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target_p->localClient->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[0] = sender prefix
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* parv[1] = operator to challenge for, or +response
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*
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*/
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static int
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m_challenge(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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uint8_t *challenge = NULL;
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char chal_line[CHALLENGE_WIDTH];
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uint8_t *b_response;
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int len = 0;
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size_t cnt;
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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 0;
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}
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if(*parv[1] == '+')
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{
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if(source_p->localClient->chal_resp == NULL)
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return 0;
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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)",
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source_p->localClient->opername, source_p->name,
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source_p->username, source_p->host);
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if(ConfigFileEntry.failed_oper_notice)
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sendto_realops_flags(UMODE_ALL, L_ALL,
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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 0;
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}
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parv[1]++;
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b_response =
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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->chal_resp, 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);
|
||
|
|
ilog(L_FOPER, "FAILED CHALLENGE (%s) by (%s!%s@%s)",
|
||
|
|
source_p->localClient->opername, source_p->name,
|
||
|
|
source_p->username, source_p->host);
|
||
|
|
|
||
|
|
if(ConfigFileEntry.failed_oper_notice)
|
||
|
|
sendto_realops_flags(UMODE_ALL, L_ALL,
|
||
|
|
"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->host,
|
||
|
|
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)",
|
||
|
|
source_p->localClient->opername, source_p->name,
|
||
|
|
source_p->username, source_p->host);
|
||
|
|
|
||
|
|
if(ConfigFileEntry.failed_oper_notice)
|
||
|
|
sendto_realops_flags(UMODE_ALL, L_ALL,
|
||
|
|
"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",
|
||
|
|
source_p->localClient->opername, source_p->name,
|
||
|
|
source_p->username, source_p->host);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
cleanup_challenge(source_p);
|
||
|
|
|
||
|
|
oper_p = find_oper_conf(source_p->username, source_p->host, 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 CHALLENGE (%s) by (%s!%s@%s)",
|
||
|
|
parv[1], source_p->name, source_p->username, source_p->host);
|
||
|
|
|
||
|
|
if(ConfigFileEntry.failed_oper_notice)
|
||
|
|
sendto_realops_flags(UMODE_ALL, L_ALL,
|
||
|
|
"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) && !IsSSL(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) -- requires SSL/TLS",
|
||
|
|
parv[1], source_p->name, source_p->username, source_p->host);
|
||
|
|
|
||
|
|
if(ConfigFileEntry.failed_oper_notice)
|
||
|
|
{
|
||
|
|
sendto_realops_flags(UMODE_ALL, 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->chal_resp, oper_p->rsa_pubkey))
|
||
|
|
{
|
||
|
|
char *chal = (char *)challenge;
|
||
|
|
source_p->localClient->chal_time = rb_current_time();
|
||
|
|
SetCork(source_p);
|
||
|
|
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;
|
||
|
|
|
||
|
|
}
|
||
|
|
ClearCork(source_p);
|
||
|
|
sendto_one(source_p, form_str(RPL_ENDOFRSACHALLENGE2), me.name, source_p->name);
|
||
|
|
|
||
|
|
source_p->localClient->opername = rb_strdup(oper_p->name);
|
||
|
|
rb_free(challenge);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
sendto_one_notice(source_p, ":Failed to generate challenge.");
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static int
|
||
|
|
generate_challenge(uint8_t **r_challenge, uint8_t **r_response, RSA * rsa)
|
||
|
|
{
|
||
|
|
SHA_CTX ctx;
|
||
|
|
uint8_t 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, secret, CHALLENGE_SECRET_LENGTH);
|
||
|
|
*r_response = rb_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 = 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 /* USE_CHALLENGE */
|