2 * ircd-ratbox: A slightly useful ircd.
3 * m_challenge.c: Allows an IRC Operator to securely authenticate.
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
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.
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.
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
24 * $Id: m_challenge.c 3161 2007-01-25 07:23:01Z nenolod $
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>
48 #include "irc_string.h"
52 #include "s_newconf.h"
54 #define CHALLENGE_WIDTH BUFSIZE - (NICKLEN + HOSTLEN + 12)
55 #define CHALLENGE_EXPIRES 180 /* 180 seconds should be more than long enough */
56 #define CHALLENGE_SECRET_LENGTH 128 /* how long our challenge secret should be */
58 #ifndef HAVE_LIBCRYPTO
59 /* Maybe this should be an error or something?-davidt */
60 /* now it is -larne */
61 static int challenge_load(void)
63 #ifndef STATIC_MODULES
64 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
65 "Challenge module not loaded because OpenSSL is not available.");
66 ilog(L_MAIN
, "Challenge module not loaded because OpenSSL is not available.");
73 DECLARE_MODULE_AV1(challenge
, challenge_load
, NULL
, NULL
, NULL
, NULL
, "$Revision: 3161 $");
76 static int m_challenge(struct Client
*, struct Client
*, int, const char **);
78 /* We have openssl support, so include /CHALLENGE */
79 struct Message challenge_msgtab
= {
80 "CHALLENGE", 0, 0, 0, MFLG_SLOW
,
81 {mg_unreg
, {m_challenge
, 2}, mg_ignore
, mg_ignore
, mg_ignore
, {m_challenge
, 2}}
84 mapi_clist_av1 challenge_clist
[] = { &challenge_msgtab
, NULL
};
85 DECLARE_MODULE_AV1(challenge
, NULL
, NULL
, challenge_clist
, NULL
, NULL
, "$Revision: 3161 $");
87 static int generate_challenge(char **r_challenge
, char **r_response
, RSA
* key
);
90 cleanup_challenge(struct Client
*target_p
)
92 if(target_p
->localClient
== NULL
)
95 MyFree(target_p
->localClient
->challenge
);
96 MyFree(target_p
->localClient
->opername
);
97 target_p
->localClient
->challenge
= NULL
;
98 target_p
->localClient
->opername
= NULL
;
99 target_p
->localClient
->chal_time
= 0;
103 * m_challenge - generate RSA challenge for wouldbe oper
104 * parv[0] = sender prefix
105 * parv[1] = operator to challenge for, or +response
109 m_challenge(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
111 struct oper_conf
*oper_p
;
112 char *challenge
= NULL
; /* to placate gcc */
113 char chal_line
[CHALLENGE_WIDTH
];
114 unsigned char *b_response
;
118 /* if theyre an oper, reprint oper motd and ignore */
121 sendto_one(source_p
, form_str(RPL_YOUREOPER
), me
.name
, source_p
->name
);
122 send_oper_motd(source_p
);
128 /* Ignore it if we aren't expecting this... -A1kmm */
129 if(!source_p
->localClient
->challenge
)
132 if((CurrentTime
- source_p
->localClient
->chal_time
) > CHALLENGE_EXPIRES
)
134 sendto_one(source_p
, form_str(ERR_PASSWDMISMATCH
), me
.name
, source_p
->name
);
135 ilog(L_FOPER
, "EXPIRED CHALLENGE (%s) by (%s!%s@%s) (%s)",
136 source_p
->localClient
->opername
, source_p
->name
,
137 source_p
->username
, source_p
->host
, source_p
->sockhost
);
139 if(ConfigFileEntry
.failed_oper_notice
)
140 sendto_realops_snomask(SNO_GENERAL
, L_NETWIDE
,
141 "Expired CHALLENGE attempt by %s (%s@%s)",
142 source_p
->name
, source_p
->username
,
144 cleanup_challenge(source_p
);
148 b_response
= ircd_base64_decode((const unsigned char *)++parv
[1], strlen(parv
[1]), &len
);
150 if(len
!= SHA_DIGEST_LENGTH
||
151 memcmp(source_p
->localClient
->challenge
, b_response
, SHA_DIGEST_LENGTH
))
153 sendto_one(source_p
, form_str(ERR_PASSWDMISMATCH
), me
.name
, source_p
->name
);
154 ilog(L_FOPER
, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s)",
155 source_p
->localClient
->opername
, source_p
->name
,
156 source_p
->username
, source_p
->host
, source_p
->sockhost
);
158 if(ConfigFileEntry
.failed_oper_notice
)
159 sendto_realops_snomask(SNO_GENERAL
, L_NETWIDE
,
160 "Failed CHALLENGE attempt by %s (%s@%s)",
161 source_p
->name
, source_p
->username
,
165 cleanup_challenge(source_p
);
171 oper_p
= find_oper_conf(source_p
->username
, source_p
->orighost
,
173 source_p
->localClient
->opername
);
177 sendto_one(source_p
, form_str(ERR_NOOPERHOST
),
178 me
.name
, source_p
->name
);
179 ilog(L_FOPER
, "FAILED OPER (%s) by (%s!%s@%s) (%s)",
180 source_p
->localClient
->opername
, source_p
->name
,
181 source_p
->username
, source_p
->host
,
184 if(ConfigFileEntry
.failed_oper_notice
)
185 sendto_realops_snomask(SNO_GENERAL
, L_NETWIDE
,
186 "Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
187 source_p
->name
, source_p
->username
,
192 cleanup_challenge(source_p
);
194 oper_up(source_p
, oper_p
);
196 ilog(L_OPERED
, "OPER %s by %s!%s@%s (%s)",
197 source_p
->localClient
->opername
, source_p
->name
,
198 source_p
->username
, source_p
->host
, source_p
->sockhost
);
202 cleanup_challenge(source_p
);
204 oper_p
= find_oper_conf(source_p
->username
, source_p
->orighost
,
205 source_p
->sockhost
, parv
[1]);
209 sendto_one(source_p
, form_str(ERR_NOOPERHOST
), me
.name
, source_p
->name
);
210 ilog(L_FOPER
, "FAILED OPER (%s) by (%s!%s@%s) (%s)",
211 parv
[1], source_p
->name
,
212 source_p
->username
, source_p
->host
, source_p
->sockhost
);
214 if(ConfigFileEntry
.failed_oper_notice
)
215 sendto_realops_snomask(SNO_GENERAL
, L_NETWIDE
,
216 "Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
217 source_p
->name
, source_p
->username
, source_p
->host
);
221 if(!oper_p
->rsa_pubkey
)
223 sendto_one_notice(source_p
, ":I'm sorry, PK authentication is not enabled for your oper{} block.");
227 if(!generate_challenge(&challenge
, &(source_p
->localClient
->challenge
), oper_p
->rsa_pubkey
))
229 char *chal
= challenge
;
230 source_p
->localClient
->chal_time
= CurrentTime
;
233 cnt
= strlcpy(chal_line
, chal
, CHALLENGE_WIDTH
);
234 sendto_one(source_p
, form_str(RPL_RSACHALLENGE2
), me
.name
, source_p
->name
, chal_line
);
235 if(cnt
> CHALLENGE_WIDTH
)
236 chal
+= CHALLENGE_WIDTH
- 1;
241 sendto_one(source_p
, form_str(RPL_ENDOFRSACHALLENGE2
),
242 me
.name
, source_p
->name
);
244 DupString(source_p
->localClient
->opername
, oper_p
->name
);
247 sendto_one_notice(source_p
, ":Failed to generate challenge.");
253 get_randomness(unsigned char *buf
, int length
)
255 /* Seed OpenSSL PRNG with EGD enthropy pool -kre */
256 if(ConfigFileEntry
.use_egd
&& (ConfigFileEntry
.egdpool_path
!= NULL
))
258 if(RAND_egd(ConfigFileEntry
.egdpool_path
) == -1)
264 if(RAND_bytes(buf
, length
) > 0)
268 if(RAND_pseudo_bytes(buf
, length
) >= 0)
275 generate_challenge(char **r_challenge
, char **r_response
, RSA
* rsa
)
278 unsigned char secret
[CHALLENGE_SECRET_LENGTH
], *tmp
;
279 unsigned long length
;
281 unsigned long cnt
= 0;
286 if(get_randomness(secret
, CHALLENGE_SECRET_LENGTH
))
289 SHA1_Update(&ctx
, (u_int8_t
*)secret
, CHALLENGE_SECRET_LENGTH
);
290 *r_response
= MyMalloc(SHA_DIGEST_LENGTH
);
291 SHA1_Final((u_int8_t
*)*r_response
, &ctx
);
293 length
= RSA_size(rsa
);
294 tmp
= MyMalloc(length
);
295 ret
= RSA_public_encrypt(CHALLENGE_SECRET_LENGTH
, secret
, tmp
, rsa
, RSA_PKCS1_OAEP_PADDING
);
299 *r_challenge
= (char *)ircd_base64_encode(tmp
, ret
);
308 ERR_load_crypto_strings();
309 while ((cnt
< 100) && (e
= ERR_get_error()))
311 ilog(L_MAIN
, "SSL error: %s", ERR_error_string(e
, 0));
318 #endif /* HAVE_LIBCRYPTO */