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