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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: crypt.c,v 1.4 1998/01/12 16:45:55 mdw Exp $ |
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4 | * |
5 | * Cryptographic transfer of `become' requests |
6 | * |
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7 | * (c) 1998 EBI |
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8 | */ |
9 | |
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10 | /*----- Licensing notice --------------------------------------------------* |
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11 | * |
12 | * This file is part of `become' |
13 | * |
14 | * `Become' is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * `Become' is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
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25 | * along with `become'; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: crypt.c,v $ |
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32 | * Revision 1.4 1998/01/12 16:45:55 mdw |
33 | * Fix copyright date. |
34 | * |
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35 | * Revision 1.3 1997/09/26 09:14:58 mdw |
36 | * Merged blowfish branch into trunk. |
37 | * |
38 | * Revision 1.2.2.1 1997/09/26 09:08:02 mdw |
39 | * Use the Blowfish encryption algorithm instead of IDEA. This is partly |
40 | * because I prefer Blowfish (without any particularly strong evidence) but |
41 | * mainly because IDEA is patented and Blowfish isn't. |
42 | * |
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43 | * Revision 1.2 1997/08/04 10:24:21 mdw |
44 | * Sources placed under CVS control. |
45 | * |
46 | * Revision 1.1 1997/07/21 13:47:51 mdw |
c4f2d992 |
47 | * Initial revision |
48 | * |
49 | */ |
50 | |
51 | /*----- Header files ------------------------------------------------------*/ |
52 | |
53 | /* --- ANSI headers --- */ |
54 | |
55 | #include <ctype.h> |
56 | #include <errno.h> |
57 | #include <stdio.h> |
58 | #include <stdlib.h> |
59 | #include <string.h> |
60 | #include <time.h> |
61 | |
62 | /* --- Unix headers --- */ |
63 | |
64 | #include <sys/types.h> |
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65 | #include <sys/time.h> |
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66 | #include <unistd.h> |
67 | #include <syslog.h> |
68 | #include <fcntl.h> |
69 | |
70 | /* --- Local headers --- */ |
71 | |
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72 | #include "become.h" |
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73 | #include "blowfish.h" |
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74 | #include "config.h" |
75 | #include "crypt.h" |
76 | #include "icrypt.h" |
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77 | #include "md5.h" |
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78 | #include "noise.h" |
79 | #include "rand.h" |
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80 | #include "tx.h" |
81 | #include "utils.h" |
82 | |
83 | /*----- Magic numbers -----------------------------------------------------*/ |
84 | |
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85 | #define crypt__timeError 60 /* Seconds error to permit */ |
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86 | |
87 | /*----- Main code ---------------------------------------------------------*/ |
88 | |
89 | /* --- @crypt__sessionKey@ --- * |
90 | * |
91 | * Arguments: @const char *seedfile@ = pointer to name of seed file |
92 | * @unsigned char *k@ = our secret key |
c4f2d992 |
93 | * @unsigned *sk@ = where to store the session key |
94 | * @unsigned char *iv@ = where to store the IV |
95 | * |
96 | * Returns: --- |
97 | * |
98 | * Use: Decides on a random session key and initialisation vector. |
99 | */ |
100 | |
101 | static void crypt__sessionKey(const char *seedfile, unsigned char *k, |
c4f2d992 |
102 | unsigned char *sk, unsigned char *iv) |
103 | { |
104 | FILE *fp; /* File handle for reading */ |
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105 | struct flock l; |
106 | int ok = 1; |
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107 | |
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108 | /* --- Open the random seed file --- * |
c4f2d992 |
109 | * |
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110 | * If I can't manage that, create a new one. |
c4f2d992 |
111 | */ |
112 | |
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113 | if ((fp = fopen(seedfile, "r+")) == 0) { |
114 | ok = 0; |
115 | if ((fp = fopen(seedfile, "w+")) == 0) |
116 | die("can't create random number file: %s", strerror(errno)); |
117 | rand_clear(); |
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118 | } |
119 | |
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120 | /* --- Lock the seed file against concurrency problems --- */ |
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121 | |
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122 | l.l_type = F_WRLCK; |
123 | l.l_whence = SEEK_SET; |
124 | l.l_start = 0; |
125 | l.l_len = 0; |
126 | if (fcntl(fileno(fp), F_SETLKW, &l) < 0) |
127 | die("can't lock random number file: %s", strerror(errno)); |
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128 | |
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129 | /* --- Now read the file, and launder the seed --- */ |
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130 | |
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131 | if (ok) |
132 | rand_read(fp); |
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133 | |
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134 | /* --- Encrypt the pool using the secret key --- */ |
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135 | |
136 | { |
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137 | icrypt_job j; |
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138 | icrypt_init(&j, k, BLOWFISH_KEYSIZE, 0); |
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139 | rand_encrypt(&j); |
140 | burn(j); |
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141 | } |
142 | |
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143 | /* --- Generate the session key and IV --- */ |
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144 | |
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145 | noise_acquire(); |
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146 | rand_extract(sk, BLOWFISH_KEYSIZE); |
147 | rand_extract(iv, BLOWFISH_BLKSIZE); |
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148 | |
149 | IF_TRACING(TRACE_CRYPTO, |
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150 | traceblk(TRACE_CRYPTO, "crypto: session key:", sk, BLOWFISH_KEYSIZE); |
03f996bd |
151 | traceblk(TRACE_CRYPTO, "crypto: initialisation vector:", |
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152 | iv, BLOWFISH_BLKSIZE); |
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153 | ); |
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154 | |
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155 | /* --- Write the seed back --- */ |
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156 | |
157 | rewind(fp); |
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158 | rand_write(fp); |
c4f2d992 |
159 | fclose(fp); |
160 | |
c4f2d992 |
161 | } |
162 | |
163 | /* --- @crypt_packRequest@ --- * |
164 | * |
165 | * Arguments: @request *rq@ = pointer to request block |
166 | * @unsigned char *buff@ = pointer to a buffer |
167 | * @time_t t@ = the current time |
168 | * @pid_t pid@ = my process ID |
169 | * @unsigned char *k@ = pointer to 128-bit key |
170 | * @unsigned char *sk@ = where to put the session key |
171 | * |
172 | * Returns: --- |
173 | * |
174 | * Use: Packs a request block into a buffer. The buffer should have |
175 | * space for at least @crq_size@ bytes. The buffer comes back |
176 | * encrypted and ready to send. |
177 | */ |
178 | |
179 | void crypt_packRequest(request *rq, unsigned char *buff, |
180 | time_t t, pid_t pid, |
181 | unsigned char *k, unsigned char *sk) |
182 | { |
183 | /* --- First, build the easy stuff in the block --- */ |
184 | |
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185 | buff[crq_cryptType] = cryptType_blowfish; |
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186 | store32(buff + crq_time, t); |
187 | store32(buff + crq_pid, pid); |
188 | store32(buff + crq_from, rq->from); |
189 | store32(buff + crq_to, rq->to); |
190 | |
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191 | /* --- Now generate session keys and things --- */ |
192 | |
193 | crypt__sessionKey(file_RANDSEED, k, sk, buff + crq_iv); |
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194 | memcpy(buff + crq_session, sk, BLOWFISH_KEYSIZE); |
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195 | |
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196 | /* --- The string causes a few problems --- * |
197 | * |
198 | * There's a good chance that the string will be a good deal shorter than |
199 | * the space allowed for it. This will probably mean lots of zeroes, and a |
200 | * very easy known-plaintext job for a potential attacker. (An early |
201 | * version of this code used @strncpy@ which is even worse!) |
202 | * |
203 | * I'll fill the block with random (from @rand@(3) -- nothing too |
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204 | * elaborate) and then encrypt it using Blowfish in CFB mode, using the |
205 | * first few bytes as the key. This should provide a sufficiently |
206 | * unpredictable background for the block. |
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207 | */ |
208 | |
209 | { |
210 | icrypt_job j; |
211 | unsigned char *p; |
212 | unsigned u; |
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213 | md5 md; |
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214 | unsigned char qk[BLOWFISH_KEYSIZE]; |
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215 | |
216 | /* --- Initialise the buffer with junk --- */ |
217 | |
218 | srand((unsigned int)(t ^ pid)); /* Seed the (bad) RNG */ |
219 | for (p = buff + crq_cmd; p < buff + crq_cmd + CMDLEN_MAX; p++) { |
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220 | u = rand(); *p = u ^ (u >> 8); |
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221 | } |
222 | |
223 | /* --- Now make the junk a whole lot harder to predict --- */ |
224 | |
225 | p = buff + crq_cmd; |
03f996bd |
226 | md5_init(&md); md5_buffer(&md, p, CMDLEN_MAX); md5_final(&md, qk); |
9e5602f0 |
227 | icrypt_init(&j, qk, BLOWFISH_KEYSIZE, 0); |
228 | icrypt_encrypt(&j, p, p, CMDLEN_MAX); |
03f996bd |
229 | burn(j); burn(qk); burn(md); |
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230 | |
231 | /* --- Copy the string into here --- */ |
232 | |
233 | strcpy((char *)buff + crq_cmd, rq->cmd); |
234 | } |
235 | |
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236 | /* --- Checksum the finished data --- */ |
237 | |
238 | { |
239 | md5 md; |
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240 | unsigned char mdbuf[MD5_HASHSIZE]; |
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241 | |
242 | md5_init(&md); |
243 | md5_buffer(&md, buff + crq_cipher, crq_check - crq_cipher); |
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244 | md5_final(&md, mdbuf); |
245 | memcpy(buff + crq_check, mdbuf, 4); |
246 | burn(md); burn(mdbuf); |
c4f2d992 |
247 | } |
248 | |
249 | /* --- Encrypt the block --- * |
250 | * |
251 | * First, encrypt the session key using the master key. Since the session |
252 | * key is effectively random, this makes cracking the master key much |
253 | * harder. The rest of the block is then encrypted with the session key, |
254 | * using the IV left over from encrypting the session key. |
255 | */ |
256 | |
257 | { |
258 | icrypt_job j; |
259 | |
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260 | T( traceblk(TRACE_CRYPTO, "crypto: plaintext request:", |
261 | buff, crq_size); ) |
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262 | |
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263 | T( traceblk(TRACE_CRYPTO, "crypto: master key:", k, BLOWFISH_KEYSIZE); ) |
264 | T( traceblk(TRACE_CRYPTO, "crypto: initial iv:", |
265 | buff + crq_iv, BLOWFISH_BLKSIZE); ) |
266 | T( traceblk(TRACE_CRYPTO, "crypto: session key:", |
267 | sk, BLOWFISH_KEYSIZE); ) |
268 | |
269 | icrypt_init(&j, k, BLOWFISH_KEYSIZE, buff + crq_iv); |
270 | |
271 | icrypt_encrypt(&j, buff + crq_session, |
272 | buff + crq_session, BLOWFISH_KEYSIZE); |
273 | T( traceblk(TRACE_CRYPTO, "crypto: encrypted session key:", |
274 | buff + crq_session, BLOWFISH_KEYSIZE); ) |
275 | |
276 | icrypt_reset(&j, sk, BLOWFISH_KEYSIZE, 0); |
277 | |
278 | T( traceblk(TRACE_CRYPTO, "crypto: partial iv:", |
279 | j.iv, BLOWFISH_BLKSIZE); ) |
280 | |
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281 | icrypt_encrypt(&j, buff + crq_cipher, |
282 | buff + crq_cipher, crq_size - crq_cipher); |
283 | burn(j); |
284 | |
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285 | T( traceblk(TRACE_CRYPTO, "crypto: ciphertext request:", |
286 | buff, crq_size); ) |
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287 | } |
288 | } |
289 | |
290 | /* --- @crypt_unpackRequest@ --- * |
291 | * |
292 | * Arguments: @reqest *rq@ = pointer to destination request block |
293 | * @unsigned char *buff@ = pointer to source buffer |
294 | * @unsigned char *k@ = pointer to encryption key |
295 | * @unsigned char *sk@ = pointer to where to store session key |
296 | * @unsigned char *rpl@ = where to start building reply |
297 | * |
298 | * Returns: Nonzero if it was decrypted OK |
299 | * |
300 | * Use: Decrypts and unpacks a request buffer. |
301 | */ |
302 | |
303 | int crypt_unpackRequest(request *rq, unsigned char *buff, |
304 | unsigned char *k, unsigned char *sk, |
305 | unsigned char *rpl) |
306 | { |
307 | { |
308 | /* --- Check the encryption format --- */ |
309 | |
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310 | if (buff[crq_cryptType] != cryptType_blowfish) |
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311 | return (0); |
312 | } |
313 | |
314 | { |
315 | /* --- First things first: decrypt the block --- */ |
316 | |
317 | icrypt_job j; |
318 | |
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319 | T( traceblk(TRACE_CRYPTO, "crypto: ciphertext request:", |
320 | buff, crq_size); ) |
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321 | |
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322 | T( traceblk(TRACE_CRYPTO, "crypto: master key:", k, BLOWFISH_KEYSIZE); ) |
323 | T( traceblk(TRACE_CRYPTO, "crypto: initial iv:", |
324 | buff + crq_iv, BLOWFISH_BLKSIZE); ) |
325 | |
326 | icrypt_init(&j, k, BLOWFISH_KEYSIZE, buff + crq_iv); |
327 | T( traceblk(TRACE_CRYPTO, "crypto: job block:", &j, sizeof(j)); ) |
328 | |
329 | T( traceblk(TRACE_CRYPTO, "crypto: encrypted session key:", |
330 | buff + crq_session, BLOWFISH_KEYSIZE); ) |
331 | icrypt_decrypt(&j, buff + crq_session, |
332 | buff + crq_session, BLOWFISH_KEYSIZE); |
333 | memcpy(sk, buff + crq_session, BLOWFISH_KEYSIZE); |
334 | T( traceblk(TRACE_CRYPTO, "crypto: session key:", |
335 | sk, BLOWFISH_KEYSIZE); ) |
336 | |
337 | icrypt_reset(&j, sk, BLOWFISH_KEYSIZE, 0); |
338 | |
339 | T( traceblk(TRACE_CRYPTO, "crypto: partial iv:", |
340 | j.iv, BLOWFISH_BLKSIZE); ) |
341 | |
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342 | icrypt_decrypt(&j, buff + crq_cipher, |
343 | buff + crq_cipher, crq_size - crq_cipher); |
344 | icrypt_saveIV(&j, rpl + crp_iv); |
345 | |
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346 | T( traceblk(TRACE_CRYPTO, "crypto: plaintext request:", |
347 | buff, crq_size); ) |
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348 | |
349 | memset(buff + crq_session, 0, BLOWFISH_KEYSIZE); /* Burn, baby, burn */ |
350 | burn(j); |
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351 | } |
352 | |
353 | { |
354 | /* --- Check the validity of the data therein --- */ |
355 | |
356 | md5 md; |
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357 | unsigned char mdbuf[MD5_HASHSIZE]; |
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358 | |
359 | md5_init(&md); |
360 | md5_buffer(&md, buff + crq_cipher, crq_check - crq_cipher); |
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361 | md5_final(&md, mdbuf); |
362 | if (memcmp(mdbuf, buff + crq_check, 4) != 0) { |
c4f2d992 |
363 | syslog(LOG_INFO, "packet rejected: bad checksum"); |
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364 | T( trace(TRACE_CRYPTO, "crypto: bad checksum on incoming request"); ) |
c4f2d992 |
365 | return (0); |
366 | } |
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367 | burn(md); burn(mdbuf); |
c4f2d992 |
368 | } |
369 | |
370 | { |
371 | /* --- Extract fields from the block --- */ |
372 | |
373 | rq->from = load32(buff + crq_from); |
374 | rq->to = load32(buff + crq_to); |
375 | memcpy(rq->cmd, buff + crq_cmd, CMDLEN_MAX); |
376 | } |
377 | |
378 | { |
379 | /* --- Fill in bits of the reply block --- */ |
380 | |
381 | long t = (long)time(0); |
382 | long u = (long)load32(buff + crq_time); |
383 | |
384 | if (t - u > crypt__timeError || u - t > crypt__timeError) { |
385 | syslog(LOG_INFO, "packet rejected: bad time"); |
03f996bd |
386 | T( trace(TRACE_CRYPTO, "crypto: bad time on incoming request"); ) |
c4f2d992 |
387 | return (0); |
388 | } |
389 | memcpy(rpl + crp_time, buff + crq_time, 8); |
390 | } |
391 | |
392 | /* --- Done --- */ |
393 | |
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394 | T( trace(TRACE_CRYPTO, "crypto: valid request received"); ) |
c4f2d992 |
395 | return (1); |
396 | } |
397 | |
398 | /* --- @crypt_packReply@ --- * |
399 | * |
400 | * Arguments: @char *buff@ = pointer to reply block |
401 | * @unsigned char *sk@ = pointer to session key |
402 | * @int answer@ = yes or no |
403 | * |
404 | * Returns: --- |
405 | * |
406 | * Use: Packs and encrypts a reply block. |
407 | */ |
408 | |
409 | void crypt_packReply(unsigned char *buff, unsigned char *sk, int answer) |
410 | { |
411 | { |
412 | /* --- Store the answer --- */ |
413 | |
414 | buff[crp_answer] = (answer != 0); |
415 | } |
416 | |
417 | { |
418 | /* --- Build the checksum --- */ |
419 | |
420 | md5 md; |
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421 | unsigned char mdbuf[MD5_HASHSIZE]; |
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422 | |
423 | md5_init(&md); |
424 | md5_buffer(&md, buff + crp_cipher, crp_check - crp_cipher); |
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425 | md5_final(&md, mdbuf); |
426 | memcpy(buff + crp_check, mdbuf, 4); |
427 | burn(md); burn(mdbuf); |
c4f2d992 |
428 | } |
429 | |
430 | { |
431 | /* --- Encrypt the buffer --- */ |
432 | |
433 | icrypt_job j; |
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434 | |
435 | T( traceblk(TRACE_CRYPTO, "crypto: plaintext reply:", buff, crp_size); ) |
436 | |
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437 | icrypt_init(&j, sk, BLOWFISH_KEYSIZE, buff + crp_iv); |
c4f2d992 |
438 | icrypt_encrypt(&j, buff + crp_cipher, |
439 | buff + crp_cipher, crp_size - crp_cipher); |
c4f2d992 |
440 | burn(j); |
03f996bd |
441 | |
442 | T( traceblk(TRACE_CRYPTO, "crypto: ciphertext reply:", buff, crp_size); ) |
c4f2d992 |
443 | } |
444 | } |
445 | |
446 | /* --- @crypt_unpackReply@ --- * |
447 | * |
448 | * Arguments: @unsigned char *buff@ = pointer to reply buffer |
449 | * @unsigned char *sk@ = pointer to session key |
450 | * @time_t t@ = time at which request was sent |
451 | * @pid_t pid@ = my process ID |
452 | * |
453 | * Returns: >0 if request granted, zero if denied, <0 if reply rejected |
454 | * |
455 | * Use: Unpacks a reply block, and informs the caller of the outcome. |
456 | */ |
457 | |
458 | int crypt_unpackReply(unsigned char *buff, unsigned char *sk, |
459 | time_t t, pid_t pid) |
460 | { |
461 | { |
462 | /* --- Decrypt my reply block --- */ |
463 | |
464 | icrypt_job j; |
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465 | |
466 | T( traceblk(TRACE_CRYPTO, "crypto: ciphertext reply:", buff, crp_size); ) |
467 | |
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468 | icrypt_init(&j, sk, BLOWFISH_KEYSIZE, buff + crp_iv); |
c4f2d992 |
469 | icrypt_decrypt(&j, buff + crp_cipher, |
470 | buff + crp_cipher, crp_size - crp_cipher); |
c4f2d992 |
471 | burn(j); |
03f996bd |
472 | |
473 | T( traceblk(TRACE_CRYPTO, "crypto: plaintext reply:", buff, crp_size); ) |
c4f2d992 |
474 | } |
475 | |
476 | { |
477 | /* --- Check validity --- */ |
478 | |
479 | md5 md; |
03f996bd |
480 | unsigned char mdbuf[MD5_HASHSIZE]; |
c4f2d992 |
481 | char b[8]; |
482 | |
483 | /* --- Check the checksum --- */ |
484 | |
485 | md5_init(&md); |
486 | md5_buffer(&md, buff + crp_cipher, crp_check - crp_cipher); |
03f996bd |
487 | md5_final(&md, mdbuf); |
488 | if (memcmp(buff + crp_check, mdbuf, 4) != 0) { |
c4f2d992 |
489 | syslog(LOG_INFO, "reply rejected: bad checksum"); |
03f996bd |
490 | T( trace(TRACE_CRYPTO, "crypto: bad checksum on reply"); ) |
c4f2d992 |
491 | return (-1); |
492 | } |
493 | |
494 | /* --- Check the identifier --- */ |
495 | |
496 | store32(b + 0, t); store32(b + 4, pid); |
497 | if (memcmp(b, buff + crp_time, sizeof(b)) != 0) { |
498 | syslog(LOG_INFO, "reply rejected: bad identification marker"); |
03f996bd |
499 | T( trace(TRACE_CRYPTO, "crypto: bad id on reply"); ) |
c4f2d992 |
500 | return (-1); |
501 | } |
502 | } |
503 | |
504 | /* --- Return the value --- */ |
505 | |
03f996bd |
506 | T( trace(TRACE_CRYPTO, "crypto: valid reply received"); ) |
c4f2d992 |
507 | return (buff[crp_answer]); |
508 | } |
509 | |
510 | /*----- Test rig ----------------------------------------------------------*/ |
511 | |
512 | #ifdef TEST_RIG |
513 | |
514 | int main(int argc, char *argv[]) |
515 | { |
c4f2d992 |
516 | unsigned char buff[8]; |
9e5602f0 |
517 | unsigned char sk[BLOWFISH_KEYSIZE], k[BLOWFISH_KEYSIZE]; |
c4f2d992 |
518 | FILE *fp; |
519 | |
520 | ego(argv[0]); |
03f996bd |
521 | traceon(stdout, TRACE_CRYPTO); |
c4f2d992 |
522 | if (argc < 3) |
523 | die("bad args"); |
524 | fp = fopen(argv[1], "r"); |
525 | if (!fp) |
526 | die("fopen: %s", strerror(errno)); |
527 | tx_getBits(k, 128, fp); |
528 | fclose(fp); |
03f996bd |
529 | crypt__sessionKey(argv[2], k, sk, buff); |
c4f2d992 |
530 | return (0); |
531 | } |
532 | |
533 | #endif |
534 | |
535 | /*----- That's all, folks -------------------------------------------------*/ |