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>
51 #include "s_newconf.h"
53 #define CHALLENGE_WIDTH BUFSIZE - (NICKLEN + HOSTLEN + 12)
54 #define CHALLENGE_EXPIRES 180 /* 180 seconds should be more than long enough */
55 #define CHALLENGE_SECRET_LENGTH 128 /* how long our challenge secret should be */
57 #ifndef HAVE_LIBCRYPTO
58 /* Maybe this should be an error or something?-davidt */
59 /* now it is -larne */
60 static int challenge_load(void)
62 #ifndef STATIC_MODULES
63 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
64 "Challenge module not loaded because OpenSSL is not available.");
65 ilog(L_MAIN
, "Challenge module not loaded because OpenSSL is not available.");
72 DECLARE_MODULE_AV1(challenge
, challenge_load
, NULL
, NULL
, NULL
, NULL
, "$Revision: 3161 $");
75 static int m_challenge(struct Client
*, struct Client
*, int, const char **);
77 /* We have openssl support, so include /CHALLENGE */
78 struct Message challenge_msgtab
= {
79 "CHALLENGE", 0, 0, 0, MFLG_SLOW
,
80 {mg_unreg
, {m_challenge
, 2}, mg_ignore
, mg_ignore
, mg_ignore
, {m_challenge
, 2}}
83 mapi_clist_av1 challenge_clist
[] = { &challenge_msgtab
, NULL
};
84 DECLARE_MODULE_AV1(challenge
, NULL
, NULL
, challenge_clist
, NULL
, NULL
, "$Revision: 3161 $");
86 static int generate_challenge(char **r_challenge
, char **r_response
, RSA
* key
);
89 cleanup_challenge(struct Client
*target_p
)
91 if(target_p
->localClient
== NULL
)
94 rb_free(target_p
->localClient
->challenge
);
95 rb_free(target_p
->localClient
->opername
);
96 target_p
->localClient
->challenge
= NULL
;
97 target_p
->localClient
->opername
= NULL
;
98 target_p
->localClient
->chal_time
= 0;
102 * m_challenge - generate RSA challenge for wouldbe oper
103 * parv[0] = sender prefix
104 * parv[1] = operator to challenge for, or +response
108 m_challenge(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
110 struct oper_conf
*oper_p
;
111 char *challenge
= NULL
; /* to placate gcc */
112 char chal_line
[CHALLENGE_WIDTH
];
113 unsigned char *b_response
;
117 /* if theyre an oper, reprint oper motd and ignore */
120 sendto_one(source_p
, form_str(RPL_YOUREOPER
), me
.name
, source_p
->name
);
121 send_oper_motd(source_p
);
127 /* Ignore it if we aren't expecting this... -A1kmm */
128 if(!source_p
->localClient
->challenge
)
131 if((rb_current_time() - source_p
->localClient
->chal_time
) > CHALLENGE_EXPIRES
)
133 sendto_one(source_p
, form_str(ERR_PASSWDMISMATCH
), me
.name
, source_p
->name
);
134 ilog(L_FOPER
, "EXPIRED CHALLENGE (%s) by (%s!%s@%s) (%s)",
135 source_p
->localClient
->opername
, source_p
->name
,
136 source_p
->username
, source_p
->host
, source_p
->sockhost
);
138 if(ConfigFileEntry
.failed_oper_notice
)
139 sendto_realops_snomask(SNO_GENERAL
, L_NETWIDE
,
140 "Expired CHALLENGE attempt by %s (%s@%s)",
141 source_p
->name
, source_p
->username
,
143 cleanup_challenge(source_p
);
147 b_response
= rb_base64_decode((const unsigned char *)++parv
[1], strlen(parv
[1]), &len
);
149 if(len
!= SHA_DIGEST_LENGTH
||
150 memcmp(source_p
->localClient
->challenge
, b_response
, SHA_DIGEST_LENGTH
))
152 sendto_one(source_p
, form_str(ERR_PASSWDMISMATCH
), me
.name
, source_p
->name
);
153 ilog(L_FOPER
, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s)",
154 source_p
->localClient
->opername
, source_p
->name
,
155 source_p
->username
, source_p
->host
, source_p
->sockhost
);
157 if(ConfigFileEntry
.failed_oper_notice
)
158 sendto_realops_snomask(SNO_GENERAL
, L_NETWIDE
,
159 "Failed CHALLENGE attempt by %s (%s@%s)",
160 source_p
->name
, source_p
->username
,
164 cleanup_challenge(source_p
);
170 oper_p
= find_oper_conf(source_p
->username
, source_p
->orighost
,
172 source_p
->localClient
->opername
);
176 sendto_one(source_p
, form_str(ERR_NOOPERHOST
),
177 me
.name
, source_p
->name
);
178 ilog(L_FOPER
, "FAILED OPER (%s) by (%s!%s@%s) (%s)",
179 source_p
->localClient
->opername
, source_p
->name
,
180 source_p
->username
, source_p
->host
,
183 if(ConfigFileEntry
.failed_oper_notice
)
184 sendto_realops_snomask(SNO_GENERAL
, L_NETWIDE
,
185 "Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
186 source_p
->name
, source_p
->username
,
191 cleanup_challenge(source_p
);
193 oper_up(source_p
, oper_p
);
195 ilog(L_OPERED
, "OPER %s by %s!%s@%s (%s)",
196 source_p
->localClient
->opername
, source_p
->name
,
197 source_p
->username
, source_p
->host
, source_p
->sockhost
);
201 cleanup_challenge(source_p
);
203 oper_p
= find_oper_conf(source_p
->username
, source_p
->orighost
,
204 source_p
->sockhost
, parv
[1]);
208 sendto_one(source_p
, form_str(ERR_NOOPERHOST
), me
.name
, source_p
->name
);
209 ilog(L_FOPER
, "FAILED OPER (%s) by (%s!%s@%s) (%s)",
210 parv
[1], source_p
->name
,
211 source_p
->username
, source_p
->host
, source_p
->sockhost
);
213 if(ConfigFileEntry
.failed_oper_notice
)
214 sendto_realops_snomask(SNO_GENERAL
, L_NETWIDE
,
215 "Failed CHALLENGE attempt - host mismatch by %s (%s@%s)",
216 source_p
->name
, source_p
->username
, source_p
->host
);
220 if(!oper_p
->rsa_pubkey
)
222 sendto_one_notice(source_p
, ":I'm sorry, PK authentication is not enabled for your oper{} block.");
226 if(!generate_challenge(&challenge
, &(source_p
->localClient
->challenge
), oper_p
->rsa_pubkey
))
228 char *chal
= challenge
;
229 source_p
->localClient
->chal_time
= rb_current_time();
232 cnt
= rb_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 source_p
->localClient
->opername
= rb_strdup(oper_p
->name
);
246 sendto_one_notice(source_p
, ":Failed to generate challenge.");
252 generate_challenge(char **r_challenge
, char **r_response
, RSA
* rsa
)
255 unsigned char secret
[CHALLENGE_SECRET_LENGTH
], *tmp
;
256 unsigned long length
;
258 unsigned long cnt
= 0;
263 if(rb_get_random(secret
, CHALLENGE_SECRET_LENGTH
))
266 SHA1_Update(&ctx
, (uint8_t *)secret
, CHALLENGE_SECRET_LENGTH
);
267 *r_response
= malloc(SHA_DIGEST_LENGTH
);
268 SHA1_Final((uint8_t *)*r_response
, &ctx
);
270 length
= RSA_size(rsa
);
271 tmp
= rb_malloc(length
);
272 ret
= RSA_public_encrypt(CHALLENGE_SECRET_LENGTH
, secret
, tmp
, rsa
, RSA_PKCS1_OAEP_PADDING
);
276 *r_challenge
= (char *)rb_base64_encode(tmp
, ret
);
282 rb_free(*r_response
);
286 ERR_load_crypto_strings();
287 while ((cnt
< 100) && (e
= ERR_get_error()))
289 ilog(L_MAIN
, "SSL error: %s", ERR_error_string(e
, 0));
296 #endif /* HAVE_LIBCRYPTO */