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solanum-vs-hackint-and-char.../modules/m_challenge.c
Aaron Jones c790520218 modules/m_challenge.c: log correct mechanism 
I suspect this is a copy/paste omission when duplicating the code from
modules/m_oper.c when it was created.
2023-11-06 14:47:16 +00:00

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/*
* 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 - host mismatch by %s (%s@%s)",
source_p->name, source_p->username, source_p->host);
return;
}
if(!oper_p->rsa_pubkey)
{
sendto_one_notice(source_p, ":I'm sorry, PK authentication is not enabled for your oper{} block.");
return;
}
if(IsOperConfNeedSSL(oper_p) && !IsSecureClient(source_p))
{
sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
ilog(L_FOPER, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s) -- requires SSL/TLS",
parv[1], source_p->name, source_p->username, source_p->host,
source_p->sockhost);
if(ConfigFileEntry.failed_oper_notice)
{
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"Failed CHALLENGE attempt - missing SSL/TLS by %s (%s@%s)",
source_p->name, source_p->username, source_p->host);
}
return;
}
if (oper_p->certfp != NULL)
{
if (source_p->certfp == NULL || rb_strcasecmp(source_p->certfp, oper_p->certfp))
{
sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST));
ilog(L_FOPER, "FAILED 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 */
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