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212380e3 AC |
1 | /* |
2 | * ircd-ratbox: A slightly useful ircd. | |
3 | * m_challenge.c: Allows an IRC Operator to securely authenticate. | |
4 | * | |
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 | |
8 | * | |
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. | |
13 | * | |
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. | |
18 | * | |
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 | |
22 | * USA | |
23 | * | |
5366977b | 24 | * $Id: m_challenge.c 3161 2007-01-25 07:23:01Z nenolod $ |
212380e3 AC |
25 | */ |
26 | ||
27 | #include "stdinc.h" | |
28 | ||
29 | #ifdef HAVE_LIBCRYPTO | |
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> | |
37 | #endif | |
38 | ||
212380e3 AC |
39 | #include "client.h" |
40 | #include "ircd.h" | |
41 | #include "modules.h" | |
42 | #include "numeric.h" | |
43 | #include "send.h" | |
44 | #include "s_conf.h" | |
45 | #include "msg.h" | |
46 | #include "parse.h" | |
4562c604 | 47 | #include "match.h" |
4016731b | 48 | #include "logger.h" |
212380e3 AC |
49 | #include "s_user.h" |
50 | #include "cache.h" | |
51 | #include "s_newconf.h" | |
52 | ||
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 */ | |
56 | ||
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) | |
61 | { | |
62 | #ifndef STATIC_MODULES | |
55abcbb2 | 63 | sendto_realops_snomask(SNO_GENERAL, L_ALL, |
212380e3 AC |
64 | "Challenge module not loaded because OpenSSL is not available."); |
65 | ilog(L_MAIN, "Challenge module not loaded because OpenSSL is not available."); | |
66 | return -1; | |
67 | #else | |
68 | return 0; | |
69 | #endif | |
70 | } | |
71 | ||
5366977b | 72 | DECLARE_MODULE_AV1(challenge, challenge_load, NULL, NULL, NULL, NULL, "$Revision: 3161 $"); |
212380e3 AC |
73 | #else |
74 | ||
75 | static int m_challenge(struct Client *, struct Client *, int, const char **); | |
76 | ||
77 | /* We have openssl support, so include /CHALLENGE */ | |
78 | struct Message challenge_msgtab = { | |
79 | "CHALLENGE", 0, 0, 0, MFLG_SLOW, | |
80 | {mg_unreg, {m_challenge, 2}, mg_ignore, mg_ignore, mg_ignore, {m_challenge, 2}} | |
81 | }; | |
82 | ||
83 | mapi_clist_av1 challenge_clist[] = { &challenge_msgtab, NULL }; | |
5366977b | 84 | DECLARE_MODULE_AV1(challenge, NULL, NULL, challenge_clist, NULL, NULL, "$Revision: 3161 $"); |
212380e3 AC |
85 | |
86 | static int generate_challenge(char **r_challenge, char **r_response, RSA * key); | |
87 | ||
88 | static void | |
89 | cleanup_challenge(struct Client *target_p) | |
90 | { | |
91 | if(target_p->localClient == NULL) | |
92 | return; | |
55abcbb2 | 93 | |
637c4932 VY |
94 | rb_free(target_p->localClient->challenge); |
95 | rb_free(target_p->localClient->opername); | |
212380e3 AC |
96 | target_p->localClient->challenge = NULL; |
97 | target_p->localClient->opername = NULL; | |
98 | target_p->localClient->chal_time = 0; | |
99 | } | |
100 | ||
101 | /* | |
102 | * m_challenge - generate RSA challenge for wouldbe oper | |
212380e3 AC |
103 | * parv[1] = operator to challenge for, or +response |
104 | * | |
105 | */ | |
106 | static int | |
107 | m_challenge(struct Client *client_p, struct Client *source_p, int parc, const char *parv[]) | |
108 | { | |
109 | struct oper_conf *oper_p; | |
110 | char *challenge = NULL; /* to placate gcc */ | |
55abcbb2 | 111 | char chal_line[CHALLENGE_WIDTH]; |
212380e3 AC |
112 | unsigned char *b_response; |
113 | size_t cnt; | |
114 | int len = 0; | |
115 | ||
116 | /* if theyre an oper, reprint oper motd and ignore */ | |
117 | if(IsOper(source_p)) | |
118 | { | |
119 | sendto_one(source_p, form_str(RPL_YOUREOPER), me.name, source_p->name); | |
120 | send_oper_motd(source_p); | |
121 | return 0; | |
122 | } | |
123 | ||
124 | if(*parv[1] == '+') | |
125 | { | |
126 | /* Ignore it if we aren't expecting this... -A1kmm */ | |
127 | if(!source_p->localClient->challenge) | |
128 | return 0; | |
129 | ||
e3354945 | 130 | if((rb_current_time() - source_p->localClient->chal_time) > CHALLENGE_EXPIRES) |
212380e3 AC |
131 | { |
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); | |
136 | ||
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, | |
141 | source_p->host); | |
142 | cleanup_challenge(source_p); | |
55abcbb2 | 143 | return 0; |
212380e3 AC |
144 | } |
145 | ||
6493f05d EM |
146 | parv[1]++; |
147 | b_response = rb_base64_decode((const unsigned char *)parv[1], strlen(parv[1]), &len); | |
212380e3 AC |
148 | |
149 | if(len != SHA_DIGEST_LENGTH || | |
150 | memcmp(source_p->localClient->challenge, b_response, SHA_DIGEST_LENGTH)) | |
151 | { | |
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); | |
156 | ||
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, | |
161 | source_p->host); | |
162 | ||
637c4932 | 163 | rb_free(b_response); |
212380e3 AC |
164 | cleanup_challenge(source_p); |
165 | return 0; | |
166 | } | |
167 | ||
637c4932 | 168 | rb_free(b_response); |
212380e3 | 169 | |
55abcbb2 KB |
170 | oper_p = find_oper_conf(source_p->username, source_p->orighost, |
171 | source_p->sockhost, | |
212380e3 AC |
172 | source_p->localClient->opername); |
173 | ||
174 | if(oper_p == NULL) | |
175 | { | |
76169ea7 | 176 | sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST)); |
212380e3 AC |
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, | |
180 | source_p->sockhost); | |
181 | ||
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, | |
186 | source_p->host); | |
187 | return 0; | |
188 | } | |
189 | ||
190 | cleanup_challenge(source_p); | |
191 | ||
192 | oper_up(source_p, oper_p); | |
193 | ||
194 | ilog(L_OPERED, "OPER %s by %s!%s@%s (%s)", | |
55abcbb2 | 195 | source_p->localClient->opername, source_p->name, |
212380e3 AC |
196 | source_p->username, source_p->host, source_p->sockhost); |
197 | return 0; | |
198 | } | |
199 | ||
200 | cleanup_challenge(source_p); | |
201 | ||
55abcbb2 | 202 | oper_p = find_oper_conf(source_p->username, source_p->orighost, |
212380e3 AC |
203 | source_p->sockhost, parv[1]); |
204 | ||
205 | if(oper_p == NULL) | |
206 | { | |
76169ea7 | 207 | sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST)); |
212380e3 AC |
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); | |
211 | ||
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); | |
216 | return 0; | |
217 | } | |
218 | ||
219 | if(!oper_p->rsa_pubkey) | |
220 | { | |
5366977b | 221 | sendto_one_notice(source_p, ":I'm sorry, PK authentication is not enabled for your oper{} block."); |
212380e3 AC |
222 | return 0; |
223 | } | |
224 | ||
b1594414 JT |
225 | if(IsOperConfNeedSSL(oper_p) && !IsSSLClient(source_p)) |
226 | { | |
76169ea7 | 227 | sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST)); |
b1594414 JT |
228 | ilog(L_FOPER, "FAILED CHALLENGE (%s) by (%s!%s@%s) (%s) -- requires SSL/TLS", |
229 | parv[1], source_p->name, source_p->username, source_p->host, | |
230 | source_p->sockhost); | |
231 | ||
232 | if(ConfigFileEntry.failed_oper_notice) | |
233 | { | |
234 | sendto_realops_snomask(SNO_GENERAL, L_ALL, | |
235 | "Failed CHALLENGE attempt - missing SSL/TLS by %s (%s@%s)", | |
236 | source_p->name, source_p->username, source_p->host); | |
237 | } | |
238 | return 0; | |
239 | } | |
240 | ||
ed8b3d69 AC |
241 | if (oper_p->certfp != NULL) |
242 | { | |
243 | if (source_p->certfp == NULL || strcasecmp(source_p->certfp, oper_p->certfp)) | |
244 | { | |
245 | sendto_one_numeric(source_p, ERR_NOOPERHOST, form_str(ERR_NOOPERHOST)); | |
246 | ilog(L_FOPER, "FAILED OPER (%s) by (%s!%s@%s) (%s) -- client certificate fingerprint mismatch", | |
fad065bb | 247 | parv[1], source_p->name, |
ed8b3d69 AC |
248 | source_p->username, source_p->host, source_p->sockhost); |
249 | ||
250 | if(ConfigFileEntry.failed_oper_notice) | |
251 | { | |
252 | sendto_realops_snomask(SNO_GENERAL, L_ALL, | |
253 | "Failed OPER attempt - client certificate fingerprint mismatch by %s (%s@%s)", | |
254 | source_p->name, source_p->username, source_p->host); | |
255 | } | |
256 | return 0; | |
257 | } | |
258 | } | |
259 | ||
212380e3 AC |
260 | if(!generate_challenge(&challenge, &(source_p->localClient->challenge), oper_p->rsa_pubkey)) |
261 | { | |
262 | char *chal = challenge; | |
e3354945 | 263 | source_p->localClient->chal_time = rb_current_time(); |
212380e3 AC |
264 | for(;;) |
265 | { | |
f427c8b0 | 266 | cnt = rb_strlcpy(chal_line, chal, CHALLENGE_WIDTH); |
212380e3 AC |
267 | sendto_one(source_p, form_str(RPL_RSACHALLENGE2), me.name, source_p->name, chal_line); |
268 | if(cnt > CHALLENGE_WIDTH) | |
269 | chal += CHALLENGE_WIDTH - 1; | |
270 | else | |
271 | break; | |
55abcbb2 | 272 | |
212380e3 | 273 | } |
55abcbb2 | 274 | sendto_one(source_p, form_str(RPL_ENDOFRSACHALLENGE2), |
212380e3 | 275 | me.name, source_p->name); |
637c4932 | 276 | rb_free(challenge); |
eddc2ab6 | 277 | source_p->localClient->opername = rb_strdup(oper_p->name); |
212380e3 AC |
278 | } |
279 | else | |
280 | sendto_one_notice(source_p, ":Failed to generate challenge."); | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
212380e3 AC |
285 | static int |
286 | generate_challenge(char **r_challenge, char **r_response, RSA * rsa) | |
287 | { | |
288 | SHA_CTX ctx; | |
289 | unsigned char secret[CHALLENGE_SECRET_LENGTH], *tmp; | |
290 | unsigned long length; | |
291 | unsigned long e = 0; | |
292 | unsigned long cnt = 0; | |
293 | int ret; | |
294 | ||
295 | if(!rsa) | |
296 | return -1; | |
f55930ac | 297 | if(rb_get_random(secret, CHALLENGE_SECRET_LENGTH)) |
212380e3 AC |
298 | { |
299 | SHA1_Init(&ctx); | |
f55930ac VY |
300 | SHA1_Update(&ctx, (uint8_t *)secret, CHALLENGE_SECRET_LENGTH); |
301 | *r_response = malloc(SHA_DIGEST_LENGTH); | |
302 | SHA1_Final((uint8_t *)*r_response, &ctx); | |
212380e3 AC |
303 | |
304 | length = RSA_size(rsa); | |
eddc2ab6 | 305 | tmp = rb_malloc(length); |
212380e3 AC |
306 | ret = RSA_public_encrypt(CHALLENGE_SECRET_LENGTH, secret, tmp, rsa, RSA_PKCS1_OAEP_PADDING); |
307 | ||
f55930ac | 308 | if(ret >= 0) |
212380e3 | 309 | { |
f55930ac | 310 | *r_challenge = (char *)rb_base64_encode(tmp, ret); |
637c4932 | 311 | rb_free(tmp); |
212380e3 AC |
312 | return 0; |
313 | } | |
f55930ac | 314 | |
637c4932 VY |
315 | rb_free(tmp); |
316 | rb_free(*r_response); | |
212380e3 AC |
317 | *r_response = NULL; |
318 | } | |
319 | ||
320 | ERR_load_crypto_strings(); | |
321 | while ((cnt < 100) && (e = ERR_get_error())) | |
322 | { | |
323 | ilog(L_MAIN, "SSL error: %s", ERR_error_string(e, 0)); | |
324 | cnt++; | |
325 | } | |
326 | ||
327 | return (-1); | |
328 | } | |
329 | ||
330 | #endif /* HAVE_LIBCRYPTO */ |