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
29 #include <openssl/pem.h>
30 #include <openssl/rand.h>
31 #include <openssl/rsa.h>
32 #include <openssl/md5.h>
33 #include <openssl/bn.h>
34 #include <openssl/evp.h>
35 #include <openssl/err.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: 3161 $");
74 static int m_challenge(struct Client
*, struct Client
*, int, const char **);
76 /* We have openssl support, so include /CHALLENGE */
77 struct Message challenge_msgtab
= {
78 "CHALLENGE", 0, 0, 0, MFLG_SLOW
,
79 {mg_unreg
, {m_challenge
, 2}, mg_ignore
, mg_ignore
, mg_ignore
, {m_challenge
, 2}}
82 mapi_clist_av1 challenge_clist
[] = { &challenge_msgtab
, NULL
};
83 DECLARE_MODULE_AV1(challenge
, NULL
, NULL
, challenge_clist
, NULL
, NULL
, "$Revision: 3161 $");
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 rb_free(target_p
->localClient
->challenge
);
94 rb_free(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[1] = operator to challenge for, or +response
106 m_challenge(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
108 struct oper_conf
*oper_p
;
109 char *challenge
= NULL
; /* to placate gcc */
110 char chal_line
[CHALLENGE_WIDTH
];
111 unsigned char *b_response
;
115 /* if theyre an oper, reprint oper motd and ignore */
118 sendto_one(source_p
, form_str(RPL_YOUREOPER
), me
.name
, source_p
->name
);
119 send_oper_motd(source_p
);
125 /* Ignore it if we aren't expecting this... -A1kmm */
126 if(!source_p
->localClient
->challenge
)
129 if((rb_current_time() - source_p
->localClient
->chal_time
) > CHALLENGE_EXPIRES
)
131 sendto_one(source_p
, form_str(ERR_PASSWDMISMATCH
), me
.name
, source_p
->name
);
132 ilog(L_FOPER
, "EXPIRED CHALLENGE (%s) by (%s!%s@%s) (%s)",
133 source_p
->localClient
->opername
, source_p
->name
,
134 source_p
->username
, source_p
->host
, source_p
->sockhost
);
136 if(ConfigFileEntry
.failed_oper_notice
)
137 sendto_realops_snomask(SNO_GENERAL
, L_NETWIDE
,
138 "Expired CHALLENGE attempt by %s (%s@%s)",
139 source_p
->name
, source_p
->username
,
141 cleanup_challenge(source_p
);
145 b_response
= rb_base64_decode((const unsigned char *)++parv
[1], strlen(parv
[1]), &len
);
147 if(len
!= SHA_DIGEST_LENGTH
||
148 memcmp(source_p
->localClient
->challenge
, b_response
, SHA_DIGEST_LENGTH
))
150 sendto_one(source_p
, form_str(ERR_PASSWDMISMATCH
), me
.name
, source_p
->name
);
151 ilog(L_FOPER
, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s)",
152 source_p
->localClient
->opername
, source_p
->name
,
153 source_p
->username
, source_p
->host
, source_p
->sockhost
);
155 if(ConfigFileEntry
.failed_oper_notice
)
156 sendto_realops_snomask(SNO_GENERAL
, L_NETWIDE
,
157 "Failed CHALLENGE attempt by %s (%s@%s)",
158 source_p
->name
, source_p
->username
,
162 cleanup_challenge(source_p
);
168 oper_p
= find_oper_conf(source_p
->username
, source_p
->orighost
,
170 source_p
->localClient
->opername
);
174 sendto_one_numeric(source_p
, ERR_NOOPERHOST
, form_str(ERR_NOOPERHOST
));
175 ilog(L_FOPER
, "FAILED OPER (%s) by (%s!%s@%s) (%s)",
176 source_p
->localClient
->opername
, source_p
->name
,
177 source_p
->username
, source_p
->host
,
180 if(ConfigFileEntry
.failed_oper_notice
)
181 sendto_realops_snomask(SNO_GENERAL
, L_NETWIDE
,
182 "Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
183 source_p
->name
, source_p
->username
,
188 cleanup_challenge(source_p
);
190 oper_up(source_p
, oper_p
);
192 ilog(L_OPERED
, "OPER %s by %s!%s@%s (%s)",
193 source_p
->localClient
->opername
, source_p
->name
,
194 source_p
->username
, source_p
->host
, source_p
->sockhost
);
198 cleanup_challenge(source_p
);
200 oper_p
= find_oper_conf(source_p
->username
, source_p
->orighost
,
201 source_p
->sockhost
, parv
[1]);
205 sendto_one_numeric(source_p
, ERR_NOOPERHOST
, form_str(ERR_NOOPERHOST
));
206 ilog(L_FOPER
, "FAILED OPER (%s) by (%s!%s@%s) (%s)",
207 parv
[1], source_p
->name
,
208 source_p
->username
, source_p
->host
, source_p
->sockhost
);
210 if(ConfigFileEntry
.failed_oper_notice
)
211 sendto_realops_snomask(SNO_GENERAL
, L_NETWIDE
,
212 "Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
213 source_p
->name
, source_p
->username
, source_p
->host
);
217 if(!oper_p
->rsa_pubkey
)
219 sendto_one_notice(source_p
, ":I'm sorry, PK authentication is not enabled for your oper{} block.");
223 if(IsOperConfNeedSSL(oper_p
) && !IsSSLClient(source_p
))
225 sendto_one_numeric(source_p
, ERR_NOOPERHOST
, form_str(ERR_NOOPERHOST
));
226 ilog(L_FOPER
, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s) -- requires SSL/TLS",
227 parv
[1], source_p
->name
, source_p
->username
, source_p
->host
,
230 if(ConfigFileEntry
.failed_oper_notice
)
232 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
233 "Failed CHALLENGE attempt - missing SSL/TLS by %s (%s@%s)",
234 source_p
->name
, source_p
->username
, source_p
->host
);
239 if (oper_p
->certfp
!= NULL
)
241 if (source_p
->certfp
== NULL
|| strcasecmp(source_p
->certfp
, oper_p
->certfp
))
243 sendto_one_numeric(source_p
, ERR_NOOPERHOST
, form_str(ERR_NOOPERHOST
));
244 ilog(L_FOPER
, "FAILED OPER (%s) by (%s!%s@%s) (%s) -- client certificate fingerprint mismatch",
245 parv
[1], source_p
->name
,
246 source_p
->username
, source_p
->host
, source_p
->sockhost
);
248 if(ConfigFileEntry
.failed_oper_notice
)
250 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
251 "Failed OPER attempt - client certificate fingerprint mismatch by %s (%s@%s)",
252 source_p
->name
, source_p
->username
, source_p
->host
);
258 if(!generate_challenge(&challenge
, &(source_p
->localClient
->challenge
), oper_p
->rsa_pubkey
))
260 char *chal
= challenge
;
261 source_p
->localClient
->chal_time
= rb_current_time();
264 cnt
= rb_strlcpy(chal_line
, chal
, CHALLENGE_WIDTH
);
265 sendto_one(source_p
, form_str(RPL_RSACHALLENGE2
), me
.name
, source_p
->name
, chal_line
);
266 if(cnt
> CHALLENGE_WIDTH
)
267 chal
+= CHALLENGE_WIDTH
- 1;
272 sendto_one(source_p
, form_str(RPL_ENDOFRSACHALLENGE2
),
273 me
.name
, source_p
->name
);
275 source_p
->localClient
->opername
= rb_strdup(oper_p
->name
);
278 sendto_one_notice(source_p
, ":Failed to generate challenge.");
284 generate_challenge(char **r_challenge
, char **r_response
, RSA
* rsa
)
287 unsigned char secret
[CHALLENGE_SECRET_LENGTH
], *tmp
;
288 unsigned long length
;
290 unsigned long cnt
= 0;
295 if(rb_get_random(secret
, CHALLENGE_SECRET_LENGTH
))
298 SHA1_Update(&ctx
, (uint8_t *)secret
, CHALLENGE_SECRET_LENGTH
);
299 *r_response
= malloc(SHA_DIGEST_LENGTH
);
300 SHA1_Final((uint8_t *)*r_response
, &ctx
);
302 length
= RSA_size(rsa
);
303 tmp
= rb_malloc(length
);
304 ret
= RSA_public_encrypt(CHALLENGE_SECRET_LENGTH
, secret
, tmp
, rsa
, RSA_PKCS1_OAEP_PADDING
);
308 *r_challenge
= (char *)rb_base64_encode(tmp
, ret
);
314 rb_free(*r_response
);
318 ERR_load_crypto_strings();
319 while ((cnt
< 100) && (e
= ERR_get_error()))
321 ilog(L_MAIN
, "SSL error: %s", ERR_error_string(e
, 0));
328 #endif /* HAVE_LIBCRYPTO */