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
28 #include <openssl/pem.h>
29 #include <openssl/rand.h>
30 #include <openssl/rsa.h>
31 #include <openssl/md5.h>
32 #include <openssl/bn.h>
33 #include <openssl/evp.h>
34 #include <openssl/err.h>
46 #include "irc_string.h"
50 #include "s_newconf.h"
52 #define CHALLENGE_WIDTH BUFSIZE - (NICKLEN + HOSTLEN + 12)
53 #define CHALLENGE_EXPIRES 180 /* 180 seconds should be more than long enough */
54 #define CHALLENGE_SECRET_LENGTH 128 /* how long our challenge secret should be */
56 #ifndef HAVE_LIBCRYPTO
57 /* Maybe this should be an error or something?-davidt */
58 /* now it is -larne */
59 static int challenge_load(void)
61 #ifndef STATIC_MODULES
62 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
63 "Challenge module not loaded because OpenSSL is not available.");
64 ilog(L_MAIN
, "Challenge module not loaded because OpenSSL is not available.");
71 DECLARE_MODULE_AV1(challenge
, challenge_load
, NULL
, NULL
, NULL
, NULL
, "$Revision: 26 $");
74 static int m_challenge(struct Client
*, struct Client
*, int, const char **);
76 /* We have openssl support, so include /CHALLENGE */
77 struct Message challenge_msgtab
= {
78 "CHALLENGE", 0, 0, 0, MFLG_SLOW
,
79 {mg_unreg
, {m_challenge
, 2}, mg_ignore
, mg_ignore
, mg_ignore
, {m_challenge
, 2}}
82 mapi_clist_av1 challenge_clist
[] = { &challenge_msgtab
, NULL
};
83 DECLARE_MODULE_AV1(challenge
, NULL
, NULL
, challenge_clist
, NULL
, NULL
, "$Revision: 26 $");
85 static int generate_challenge(char **r_challenge
, char **r_response
, RSA
* key
);
88 cleanup_challenge(struct Client
*target_p
)
90 if(target_p
->localClient
== NULL
)
93 MyFree(target_p
->localClient
->challenge
);
94 MyFree(target_p
->localClient
->opername
);
95 target_p
->localClient
->challenge
= NULL
;
96 target_p
->localClient
->opername
= NULL
;
97 target_p
->localClient
->chal_time
= 0;
101 * m_challenge - generate RSA challenge for wouldbe oper
102 * parv[0] = sender prefix
103 * parv[1] = operator to challenge for, or +response
107 m_challenge(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
109 struct oper_conf
*oper_p
;
110 char *challenge
= NULL
; /* to placate gcc */
111 char chal_line
[CHALLENGE_WIDTH
];
112 unsigned char *b_response
;
116 /* if theyre an oper, reprint oper motd and ignore */
119 sendto_one(source_p
, form_str(RPL_YOUREOPER
), me
.name
, source_p
->name
);
120 send_oper_motd(source_p
);
126 /* Ignore it if we aren't expecting this... -A1kmm */
127 if(!source_p
->localClient
->challenge
)
130 if((CurrentTime
- source_p
->localClient
->chal_time
) > CHALLENGE_EXPIRES
)
132 sendto_one(source_p
, form_str(ERR_PASSWDMISMATCH
), me
.name
, source_p
->name
);
133 ilog(L_FOPER
, "EXPIRED CHALLENGE (%s) by (%s!%s@%s) (%s)",
134 source_p
->localClient
->opername
, source_p
->name
,
135 source_p
->username
, source_p
->host
, source_p
->sockhost
);
137 if(ConfigFileEntry
.failed_oper_notice
)
138 sendto_realops_snomask(SNO_GENERAL
, L_NETWIDE
,
139 "Expired CHALLENGE attempt by %s (%s@%s)",
140 source_p
->name
, source_p
->username
,
142 cleanup_challenge(source_p
);
146 b_response
= ircd_base64_decode((const unsigned char *)++parv
[1], strlen(parv
[1]), &len
);
148 if(len
!= SHA_DIGEST_LENGTH
||
149 memcmp(source_p
->localClient
->challenge
, b_response
, SHA_DIGEST_LENGTH
))
151 sendto_one(source_p
, form_str(ERR_PASSWDMISMATCH
), me
.name
, source_p
->name
);
152 ilog(L_FOPER
, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s)",
153 source_p
->localClient
->opername
, source_p
->name
,
154 source_p
->username
, source_p
->host
, source_p
->sockhost
);
156 if(ConfigFileEntry
.failed_oper_notice
)
157 sendto_realops_snomask(SNO_GENERAL
, L_NETWIDE
,
158 "Failed CHALLENGE attempt by %s (%s@%s)",
159 source_p
->name
, source_p
->username
,
163 cleanup_challenge(source_p
);
169 oper_p
= find_oper_conf(source_p
->username
, source_p
->orighost
,
171 source_p
->localClient
->opername
);
175 sendto_one(source_p
, form_str(ERR_NOOPERHOST
),
176 me
.name
, source_p
->name
);
177 ilog(L_FOPER
, "FAILED OPER (%s) by (%s!%s@%s) (%s)",
178 source_p
->localClient
->opername
, source_p
->name
,
179 source_p
->username
, source_p
->host
,
182 if(ConfigFileEntry
.failed_oper_notice
)
183 sendto_realops_snomask(SNO_GENERAL
, L_NETWIDE
,
184 "Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
185 source_p
->name
, source_p
->username
,
190 cleanup_challenge(source_p
);
192 oper_up(source_p
, oper_p
);
194 ilog(L_OPERED
, "OPER %s by %s!%s@%s (%s)",
195 source_p
->localClient
->opername
, source_p
->name
,
196 source_p
->username
, source_p
->host
, source_p
->sockhost
);
200 cleanup_challenge(source_p
);
202 oper_p
= find_oper_conf(source_p
->username
, source_p
->orighost
,
203 source_p
->sockhost
, parv
[1]);
207 sendto_one(source_p
, form_str(ERR_NOOPERHOST
), me
.name
, source_p
->name
);
208 ilog(L_FOPER
, "FAILED OPER (%s) by (%s!%s@%s) (%s)",
209 parv
[1], source_p
->name
,
210 source_p
->username
, source_p
->host
, source_p
->sockhost
);
212 if(ConfigFileEntry
.failed_oper_notice
)
213 sendto_realops_snomask(SNO_GENERAL
, L_NETWIDE
,
214 "Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
215 source_p
->name
, source_p
->username
, source_p
->host
);
219 if(!oper_p
->rsa_pubkey
)
221 sendto_one(source_p
, ":%s NOTICE %s :I'm sorry, PK authentication "
222 "is not enabled for your oper{} block.", me
.name
, parv
[0]);
226 if(!generate_challenge(&challenge
, &(source_p
->localClient
->challenge
), oper_p
->rsa_pubkey
))
228 char *chal
= challenge
;
229 source_p
->localClient
->chal_time
= CurrentTime
;
232 cnt
= strlcpy(chal_line
, chal
, CHALLENGE_WIDTH
);
233 sendto_one(source_p
, form_str(RPL_RSACHALLENGE2
), me
.name
, source_p
->name
, chal_line
);
234 if(cnt
> CHALLENGE_WIDTH
)
235 chal
+= CHALLENGE_WIDTH
- 1;
240 sendto_one(source_p
, form_str(RPL_ENDOFRSACHALLENGE2
),
241 me
.name
, source_p
->name
);
243 DupString(source_p
->localClient
->opername
, oper_p
->name
);
246 sendto_one_notice(source_p
, ":Failed to generate challenge.");
252 get_randomness(unsigned char *buf
, int length
)
254 /* Seed OpenSSL PRNG with EGD enthropy pool -kre */
255 if(ConfigFileEntry
.use_egd
&& (ConfigFileEntry
.egdpool_path
!= NULL
))
257 if(RAND_egd(ConfigFileEntry
.egdpool_path
) == -1)
263 if(RAND_bytes(buf
, length
) > 0)
267 if(RAND_pseudo_bytes(buf
, length
) >= 0)
274 generate_challenge(char **r_challenge
, char **r_response
, RSA
* rsa
)
277 unsigned char secret
[CHALLENGE_SECRET_LENGTH
], *tmp
;
278 unsigned long length
;
280 unsigned long cnt
= 0;
285 if(get_randomness(secret
, CHALLENGE_SECRET_LENGTH
))
288 SHA1_Update(&ctx
, (u_int8_t
*)secret
, CHALLENGE_SECRET_LENGTH
);
289 *r_response
= MyMalloc(SHA_DIGEST_LENGTH
);
290 SHA1_Final((u_int8_t
*)*r_response
, &ctx
);
292 length
= RSA_size(rsa
);
293 tmp
= MyMalloc(length
);
294 ret
= RSA_public_encrypt(CHALLENGE_SECRET_LENGTH
, secret
, tmp
, rsa
, RSA_PKCS1_OAEP_PADDING
);
298 *r_challenge
= (char *)ircd_base64_encode(tmp
, ret
);
307 ERR_load_crypto_strings();
308 while ((cnt
< 100) && (e
= ERR_get_error()))
310 ilog(L_MAIN
, "SSL error: %s", ERR_error_string(e
, 0));
317 #endif /* HAVE_LIBCRYPTO */