Commit | Line | Data |
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5c3f75ec | 1 | /* -*-c-*- |
2 | * | |
c65df279 | 3 | * $Id$ |
5c3f75ec | 4 | * |
5 | * Catcrypt data encoding | |
6 | * | |
7 | * (c) 2004 Straylight/Edgeware | |
8 | */ | |
9 | ||
45c0fd36 | 10 | /*----- Licensing notice --------------------------------------------------* |
5c3f75ec | 11 | * |
12 | * This file is part of Catacomb. | |
13 | * | |
14 | * Catacomb is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU Library General Public License as | |
16 | * published by the Free Software Foundation; either version 2 of the | |
17 | * License, or (at your option) any later version. | |
45c0fd36 | 18 | * |
5c3f75ec | 19 | * Catacomb 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 Library General Public License for more details. | |
45c0fd36 | 23 | * |
5c3f75ec | 24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free | |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, | |
27 | * MA 02111-1307, USA. | |
28 | */ | |
29 | ||
30 | /*----- Header files ------------------------------------------------------*/ | |
31 | ||
fa54fe1e | 32 | #include <errno.h> |
5c3f75ec | 33 | #include <stdio.h> |
34 | ||
35 | #include <mLib/alloc.h> | |
36 | #include <mLib/base64.h> | |
37 | #include <mLib/dstr.h> | |
fa54fe1e | 38 | #include <mLib/mdwopt.h> |
5c3f75ec | 39 | #include <mLib/report.h> |
40 | #include <mLib/sub.h> | |
41 | ||
42 | #include "cc.h" | |
43 | ||
fa54fe1e | 44 | typedef int encbdryp(const char *, void *); |
45 | ||
5c3f75ec | 46 | /*----- Main code ---------------------------------------------------------*/ |
47 | ||
48 | /* --- Binary --- */ | |
49 | ||
fa54fe1e | 50 | static enc *bin_encinit(FILE *fp, const char *msg) |
51 | { enc *e = CREATE(enc); return (e); } | |
52 | static enc *bin_decinit(FILE *fp, encbdryp *func, void *p) | |
5c3f75ec | 53 | { enc *e = CREATE(enc); return (e); } |
54 | ||
55 | static int bin_read(enc *e, void *p, size_t sz) | |
56 | { | |
57 | size_t n; | |
45c0fd36 | 58 | |
5c3f75ec | 59 | if (!sz) return (0); |
60 | n = fread(p, 1, sz, e->fp); | |
61 | if (!n || ferror(e->fp)) return (-1); | |
62 | return (n); | |
63 | } | |
64 | ||
65 | static int bin_write(enc *e, const void *p, size_t sz) | |
66 | { if (sz && fwrite(p, 1, sz, e->fp) < sz) return (-1); return (0); } | |
67 | ||
68 | static int bin_done(enc *e) { return (0); } | |
69 | ||
70 | static void bin_destroy(enc *e) { DESTROY(e); } | |
71 | ||
72 | /* --- PEM --- */ | |
73 | ||
74 | typedef struct pem_encctx { | |
75 | enc e; | |
76 | char *msg; | |
77 | unsigned f; | |
78 | base64_ctx b; | |
79 | dstr d; | |
80 | size_t n; | |
81 | #define PEMF_NL 1u | |
82 | #define PEMF_EOF 2u | |
83 | } pem_encctx; | |
84 | ||
85 | static enc *pem_encinit(FILE *fp, const char *msg) | |
86 | { | |
87 | pem_encctx *pe = CREATE(pem_encctx); | |
88 | base64_init(&pe->b); | |
89 | fprintf(fp, "-----BEGIN %s-----\n", msg); | |
90 | pe->msg = xstrdup(msg); | |
91 | dstr_create(&pe->d); | |
92 | pe->n = 0; | |
93 | pe->f = 0; | |
94 | return (&pe->e); | |
95 | } | |
96 | ||
fa54fe1e | 97 | int checkbdry(const char *b, void *p) { return (!p || strcmp(b, p) == 0); } |
98 | ||
99 | static enc *pem_decinit(FILE *fp, encbdryp *func, void *p) | |
5c3f75ec | 100 | { |
101 | char buf[128]; | |
102 | int i, d; | |
103 | pem_encctx *pe; | |
104 | int ch; | |
105 | ||
106 | /* --- Go until I find a newline and `-----' --- */ | |
107 | ||
108 | top: | |
109 | d = 0; | |
110 | for (;;) { | |
111 | if ((ch = getc(fp)) == EOF) goto fail; | |
112 | switch (ch) { | |
113 | case '\n': d = 0; break; | |
114 | case '-': if (d >= 0) { d++; if (d == 5) goto banner; }; break; | |
115 | default: d = -1; break; | |
116 | } | |
117 | } | |
118 | ||
119 | /* --- See what the banner looks like --- */ | |
120 | ||
121 | banner: | |
122 | i = d = 0; | |
123 | for (;;) { | |
124 | if ((ch = getc(fp)) == EOF) goto fail; | |
125 | if (ch == '-') { d++; continue; } | |
126 | if (ch == '\n') break; | |
127 | if (i + d + 1 >= sizeof(buf)) goto top; | |
128 | while (d) { buf[i++] = '-'; d--; } | |
129 | buf[i++] = ch; | |
130 | } | |
131 | buf[i] = 0; | |
132 | ||
133 | /* --- Check we have the right framing --- */ | |
134 | ||
135 | if (d != 5) goto top; | |
fa54fe1e | 136 | if (strncmp(buf, "BEGIN ", 6) != 0 || (func && !func(buf + 6, p))) |
5c3f75ec | 137 | goto top; |
138 | ||
139 | /* --- Ready --- */ | |
140 | ||
141 | pe = CREATE(pem_encctx); | |
142 | base64_init(&pe->b); | |
143 | pe->msg = xstrdup(buf + 6); | |
144 | dstr_create(&pe->d); | |
145 | pe->n = 0; | |
146 | pe->f = PEMF_NL; | |
147 | return (&pe->e); | |
148 | ||
149 | /* --- Failed --- */ | |
150 | ||
151 | fail: | |
152 | die(EXIT_FAILURE, "initial encapsulation boundary not found"); | |
153 | return (0); | |
154 | } | |
155 | ||
156 | #define PEM_CHUNKSZ 4096 | |
157 | ||
158 | static int pem_read(enc *e, void *p, size_t sz) | |
159 | { | |
160 | pem_encctx *pe = (pem_encctx *)e; | |
161 | char buf[PEM_CHUNKSZ]; | |
162 | char *pp = p; | |
163 | int ch; | |
164 | size_t n; | |
165 | int rc = 0; | |
166 | ||
167 | for (;;) { | |
168 | n = pe->d.len - pe->n; | |
169 | if (n > sz) n = sz; | |
170 | memcpy(pp, pe->d.buf + pe->n, n); | |
171 | pe->n += n; | |
172 | pp += n; | |
173 | rc += n; | |
174 | sz -= n; | |
175 | if (!sz) break; | |
176 | if (pe->f & PEMF_EOF) return (rc ? rc : -1); | |
177 | dstr_reset(&pe->d); | |
178 | n = 0; | |
179 | for (;;) { | |
180 | if ((ch = getc(pe->e.fp)) == EOF) return (-1); | |
181 | if ((pe->f & PEMF_NL) && ch == '-') { | |
182 | ungetc(ch, pe->e.fp); | |
183 | pe->f |= PEMF_EOF; | |
184 | break; | |
185 | } | |
186 | if (ch == '\n') { pe->f |= PEMF_NL; continue; } | |
187 | pe->f &= ~PEMF_NL; | |
188 | buf[n++] = ch; | |
189 | if (n >= PEM_CHUNKSZ) break; | |
190 | } | |
191 | if (n) | |
192 | base64_decode(&pe->b, buf, n, &pe->d); | |
193 | if (pe->f & PEMF_EOF) | |
194 | base64_decode(&pe->b, 0, 0, &pe->d); | |
195 | pe->n = 0; | |
196 | } | |
197 | return (rc); | |
198 | } | |
199 | ||
200 | static int pem_write(enc *e, const void *p, size_t sz) | |
201 | { | |
202 | pem_encctx *pe = (pem_encctx *)e; | |
203 | const char *pp = p; | |
204 | size_t n; | |
205 | ||
206 | while (sz) { | |
207 | n = PEM_CHUNKSZ; | |
208 | if (n > sz) n = sz; | |
209 | dstr_reset(&pe->d); | |
210 | base64_encode(&pe->b, pp, n, &pe->d); | |
211 | if (fwrite(pe->d.buf, 1, pe->d.len, pe->e.fp) < pe->d.len) | |
212 | return (-1); | |
213 | pp += n; | |
214 | sz -= n; | |
215 | } | |
216 | return (0); | |
217 | } | |
218 | ||
219 | static int pem_encdone(enc *e) | |
220 | { | |
221 | pem_encctx *pe = (pem_encctx *)e; | |
222 | dstr_reset(&pe->d); | |
223 | base64_encode(&pe->b, 0, 0, &pe->d); | |
224 | if (fwrite(pe->d.buf, 1, pe->d.len, pe->e.fp) < pe->d.len) | |
225 | return (-1); | |
226 | if (pe->b.lnlen) fputc('\n', pe->e.fp); | |
227 | fprintf(pe->e.fp, "-----END %s-----\n", pe->msg); | |
228 | return (0); | |
229 | } | |
230 | ||
231 | static int pem_decdone(enc *e) | |
232 | { | |
233 | pem_encctx *pe = (pem_encctx *)e; | |
234 | char buf[128]; | |
235 | int i, d; | |
236 | int ch; | |
237 | ||
238 | for (d = 0; d < 5; d++) | |
239 | if ((ch = getc(pe->e.fp)) != '-') goto fail; | |
240 | i = d = 0; | |
241 | for (;;) { | |
242 | if ((ch = getc(pe->e.fp)) == EOF) goto fail; | |
243 | if (ch == '-') { d++; continue; } | |
244 | if (ch == '\n') break; | |
245 | if (i + d + 1 >= sizeof(buf)) goto fail; | |
246 | while (d) { buf[i++] = '-'; d--; } | |
247 | buf[i++] = ch; | |
248 | } | |
249 | if (d != 5) goto fail; | |
250 | buf[i] = 0; | |
251 | if (strncmp(buf, "END ", 4) != 0 || strcmp(buf + 4, pe->msg) != 0) | |
252 | goto fail; | |
253 | return (0); | |
254 | ||
255 | fail: | |
256 | die(EXIT_FAILURE, "final encapsulation boundary not found"); | |
257 | return (-1); | |
258 | } | |
259 | ||
260 | static void pem_destroy(enc *e) | |
261 | { | |
262 | pem_encctx *pe = (pem_encctx *)e; | |
263 | dstr_destroy(&pe->d); | |
264 | xfree(pe->msg); | |
265 | DESTROY(pe); | |
266 | } | |
267 | ||
268 | /* --- Encoder table --- */ | |
269 | ||
c65df279 | 270 | const encops enctab[] = { |
5c3f75ec | 271 | { "binary", "rb", "wb", |
fa54fe1e | 272 | bin_encinit, bin_decinit, |
5c3f75ec | 273 | bin_read, bin_write, |
274 | bin_done, bin_done, | |
275 | bin_destroy }, | |
276 | { "pem", "r", "w", | |
277 | pem_encinit, pem_decinit, | |
278 | pem_read, pem_write, | |
279 | pem_encdone, pem_decdone, | |
280 | pem_destroy }, | |
281 | { 0 } | |
45c0fd36 | 282 | }; |
5c3f75ec | 283 | |
284 | /* --- @getenc@ --- * | |
285 | * | |
286 | * Arguments: @const char *enc@ = name of wanted encoding | |
287 | * | |
288 | * Returns: Pointer to encoder operations. | |
289 | * | |
290 | * Use: Finds a named encoder or decoder. | |
291 | */ | |
292 | ||
293 | const encops *getenc(const char *enc) | |
294 | { | |
295 | const encops *eo; | |
296 | ||
297 | for (eo = enctab; eo->name; eo++) { | |
298 | if (strcmp(eo->name, enc) == 0) | |
299 | goto e_found; | |
300 | } | |
301 | die(EXIT_FAILURE, "couldn't find encoding `%s'", enc); | |
302 | e_found: | |
303 | return (eo); | |
304 | } | |
305 | ||
306 | /* --- @initenc@ --- * | |
307 | * | |
308 | * Arguments: @const encops *eo@ = operations (from @getenc@) | |
309 | * @FILE *fp@ = file handle to attach | |
310 | * @const char *msg@ = banner message | |
5c3f75ec | 311 | * |
312 | * Returns: The encoder object. | |
313 | * | |
314 | * Use: Initializes an encoder. | |
315 | */ | |
316 | ||
fa54fe1e | 317 | enc *initenc(const encops *eo, FILE *fp, const char *msg) |
5c3f75ec | 318 | { |
fa54fe1e | 319 | enc *e = eo->initenc(fp, msg); |
5c3f75ec | 320 | e->ops = eo; |
321 | e->fp = fp; | |
45c0fd36 | 322 | return (e); |
5c3f75ec | 323 | } |
324 | ||
fa54fe1e | 325 | /* --- @initdec@ --- * |
326 | * | |
327 | * Arguments: @const encops *eo@ = operations (from @getenc@) | |
328 | * @FILE *fp@ = file handle to attach | |
329 | * @int (*func)(const char *, void *)@ = banner check function | |
330 | * @void *p@ = argument for @func@ | |
331 | * | |
332 | * Returns: The encoder object. | |
333 | * | |
334 | * Use: Initializes an encoder. | |
335 | */ | |
336 | ||
337 | enc *initdec(const encops *eo, FILE *fp, | |
338 | int (*func)(const char *, void *), void *p) | |
339 | { | |
340 | enc *e = eo->initdec(fp, func, p); | |
341 | e->ops = eo; | |
342 | e->fp = fp; | |
343 | return (e); | |
344 | } | |
345 | ||
5c3f75ec | 346 | /* --- @freeenc@ --- * |
347 | * | |
348 | * Arguments: @enc *e@ = encoder object | |
349 | * | |
350 | * Returns: --- | |
351 | * | |
352 | * Use: Frees an encoder object. | |
353 | */ | |
354 | ||
355 | void freeenc(enc *e) { e->ops->destroy(e); } | |
356 | ||
fa54fe1e | 357 | /*----- Encoding and decoding commands ------------------------------------*/ |
358 | ||
359 | int cmd_encode(int argc, char *argv[]) | |
360 | { | |
361 | const char *of = 0; | |
362 | FILE *ofp = 0; | |
363 | FILE *fp = 0; | |
364 | const char *ef = "binary"; | |
365 | const char *bd = "MESSAGE"; | |
366 | int i; | |
367 | size_t n; | |
368 | char buf[4096]; | |
369 | unsigned f = 0; | |
370 | const encops *eo; | |
371 | enc *e; | |
372 | ||
373 | #define f_bogus 1u | |
374 | ||
375 | for (;;) { | |
376 | static const struct option opt[] = { | |
45c0fd36 MW |
377 | { "format", OPTF_ARGREQ, 0, 'f' }, |
378 | { "boundary", OPTF_ARGREQ, 0, 'b' }, | |
379 | { "output", OPTF_ARGREQ, 0, 'o' }, | |
fa54fe1e | 380 | { 0, 0, 0, 0 } |
381 | }; | |
382 | i = mdwopt(argc, argv, "f:b:o:", opt, 0, 0, 0); | |
383 | if (i < 0) break; | |
384 | switch (i) { | |
385 | case 'f': ef = optarg; break; | |
386 | case 'b': bd = optarg; break; | |
387 | case 'o': of = optarg; break; | |
388 | default: f |= f_bogus; break; | |
389 | } | |
390 | } | |
391 | if (argc - optind > 1 || (f & f_bogus)) | |
392 | die(EXIT_FAILURE, "Usage: encode [-OPTIONS] [FILE]"); | |
393 | ||
394 | if ((eo = getenc(ef)) == 0) | |
395 | die(EXIT_FAILURE, "encoding `%s' not found", ef); | |
396 | ||
397 | if (optind == argc) | |
398 | fp = stdin; | |
399 | else if (strcmp(argv[optind], "-") == 0) { | |
400 | fp = stdin; | |
401 | optind++; | |
402 | } else if ((fp = fopen(argv[optind], "rb")) == 0) { | |
403 | die(EXIT_FAILURE, "couldn't open file `%s': %s", | |
404 | argv[optind], strerror(errno)); | |
405 | } else | |
406 | optind++; | |
407 | ||
408 | if (!of || strcmp(of, "-") == 0) | |
409 | ofp = stdout; | |
410 | else if ((ofp = fopen(of, eo->wmode)) == 0) { | |
411 | die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", | |
412 | ofp, strerror(errno)); | |
413 | } | |
414 | ||
415 | e = initenc(eo, ofp, bd); | |
416 | ||
417 | do { | |
418 | n = fread(buf, 1, sizeof(buf), fp); | |
419 | if (e->ops->write(e, buf, n)) | |
420 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); | |
421 | } while (n == sizeof(buf)); | |
422 | e->ops->encdone(e); | |
423 | freeenc(e); | |
424 | return (0); | |
425 | ||
426 | #undef f_bogus | |
427 | } | |
428 | ||
429 | int cmd_decode(int argc, char *argv[]) | |
430 | { | |
431 | const char *of = 0; | |
432 | FILE *ofp = 0; | |
433 | FILE *fp = 0; | |
434 | const char *ef = "binary"; | |
435 | const char *bd = 0; | |
436 | int i; | |
437 | char buf[4096]; | |
438 | unsigned f = 0; | |
439 | const encops *eo; | |
440 | enc *e; | |
441 | ||
442 | #define f_bogus 1u | |
443 | ||
444 | for (;;) { | |
445 | static const struct option opt[] = { | |
45c0fd36 MW |
446 | { "format", OPTF_ARGREQ, 0, 'f' }, |
447 | { "boundary", OPTF_ARGREQ, 0, 'b' }, | |
448 | { "output", OPTF_ARGREQ, 0, 'o' }, | |
fa54fe1e | 449 | { 0, 0, 0, 0 } |
450 | }; | |
451 | i = mdwopt(argc, argv, "f:b:o:", opt, 0, 0, 0); | |
452 | if (i < 0) break; | |
453 | switch (i) { | |
454 | case 'f': ef = optarg; break; | |
455 | case 'b': bd = optarg; break; | |
456 | case 'o': of = optarg; break; | |
457 | default: f |= f_bogus; break; | |
458 | } | |
459 | } | |
460 | if (argc - optind > 1 || (f & f_bogus)) | |
461 | die(EXIT_FAILURE, "Usage: decode [-OPTIONS] [FILE]"); | |
462 | ||
463 | if ((eo = getenc(ef)) == 0) | |
464 | die(EXIT_FAILURE, "encoding `%s' not found", ef); | |
465 | ||
466 | if (optind == argc) | |
467 | fp = stdin; | |
468 | else if (strcmp(argv[optind], "-") == 0) { | |
469 | fp = stdin; | |
470 | optind++; | |
471 | } else if ((fp = fopen(argv[optind], eo->rmode)) == 0) { | |
472 | die(EXIT_FAILURE, "couldn't open file `%s': %s", | |
473 | argv[optind], strerror(errno)); | |
474 | } else | |
475 | optind++; | |
476 | ||
477 | if (!of || strcmp(of, "-") == 0) | |
478 | ofp = stdout; | |
479 | else if ((ofp = fopen(of, "wb")) == 0) { | |
480 | die(EXIT_FAILURE, "couldn't open file `%s' for output: %s", | |
481 | ofp, strerror(errno)); | |
482 | } | |
483 | ||
484 | e = initdec(eo, fp, checkbdry, (/*unconst*/ void *)bd); | |
485 | ||
486 | do { | |
487 | if ((i = e->ops->read(e, buf, sizeof(buf))) < 0) | |
488 | die(EXIT_FAILURE, "error reading input: %s", strerror(errno)); | |
489 | if (fwrite(buf, 1, i, ofp) < i) | |
490 | die(EXIT_FAILURE, "error writing output: %s", strerror(errno)); | |
491 | } while (i == sizeof(buf)); | |
492 | e->ops->decdone(e); | |
493 | freeenc(e); | |
494 | return (0); | |
495 | ||
496 | #undef f_bogus | |
497 | } | |
498 | ||
5c3f75ec | 499 | /*----- That's all, folks -------------------------------------------------*/ |