Annotation of src/usr.bin/openssl/asn1pars.c, Revision 1.8
1.8 ! jsing 1: /* $OpenBSD: asn1pars.c,v 1.7 2017/01/20 08:57:11 deraadt Exp $ */
1.1 jsing 2: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3: * All rights reserved.
4: *
5: * This package is an SSL implementation written
6: * by Eric Young (eay@cryptsoft.com).
7: * The implementation was written so as to conform with Netscapes SSL.
8: *
9: * This library is free for commercial and non-commercial use as long as
10: * the following conditions are aheared to. The following conditions
11: * apply to all code found in this distribution, be it the RC4, RSA,
12: * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13: * included with this distribution is covered by the same copyright terms
14: * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15: *
16: * Copyright remains Eric Young's, and as such any Copyright notices in
17: * the code are not to be removed.
18: * If this package is used in a product, Eric Young should be given attribution
19: * as the author of the parts of the library used.
20: * This can be in the form of a textual message at program startup or
21: * in documentation (online or textual) provided with the package.
22: *
23: * Redistribution and use in source and binary forms, with or without
24: * modification, are permitted provided that the following conditions
25: * are met:
26: * 1. Redistributions of source code must retain the copyright
27: * notice, this list of conditions and the following disclaimer.
28: * 2. Redistributions in binary form must reproduce the above copyright
29: * notice, this list of conditions and the following disclaimer in the
30: * documentation and/or other materials provided with the distribution.
31: * 3. All advertising materials mentioning features or use of this software
32: * must display the following acknowledgement:
33: * "This product includes cryptographic software written by
34: * Eric Young (eay@cryptsoft.com)"
35: * The word 'cryptographic' can be left out if the rouines from the library
36: * being used are not cryptographic related :-).
37: * 4. If you include any Windows specific code (or a derivative thereof) from
38: * the apps directory (application code) you must include an acknowledgement:
39: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40: *
41: * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51: * SUCH DAMAGE.
52: *
53: * The licence and distribution terms for any publically available version or
54: * derivative of this code cannot be changed. i.e. this code cannot simply be
55: * copied and put under another distribution licence
56: * [including the GNU Public Licence.]
57: */
58:
59: /* A nice addition from Dr Stephen Henson <steve@openssl.org> to
60: * add the -strparse option which parses nested binary structures
61: */
62:
63: #include <stdio.h>
64: #include <stdlib.h>
65: #include <limits.h>
66: #include <string.h>
67:
68: #include "apps.h"
1.4 deraadt 69: #include "progs.h"
1.1 jsing 70:
71: #include <openssl/err.h>
72: #include <openssl/evp.h>
73: #include <openssl/pem.h>
74: #include <openssl/x509.h>
75:
1.3 doug 76: static struct {
77: char *derfile;
78: int dump;
79: char *genconf;
80: char *genstr;
81: int indent;
82: char *infile;
83: int informat;
84: unsigned int length;
85: int noout;
86: int offset;
87: char *oidfile;
88: STACK_OF(OPENSSL_STRING) *osk;
89: } asn1pars_config;
90:
91: static int
92: asn1pars_opt_dlimit(char *arg)
93: {
94: const char *errstr;
95:
96: asn1pars_config.dump = strtonum(arg, 1, INT_MAX, &errstr);
97: if (errstr) {
98: fprintf(stderr, "-dlimit must be from 1 to INT_MAX: %s\n",
99: errstr);
100: return (-1);
101: }
102: return (0);
103: }
104:
105: static int
106: asn1pars_opt_length(char *arg)
107: {
108: const char *errstr;
109:
110: asn1pars_config.length = strtonum(arg, 1, UINT_MAX, &errstr);
111: if (errstr) {
112: fprintf(stderr, "-length must be from 1 to UINT_MAX: %s\n",
113: errstr);
114: return (-1);
115: }
116: return (0);
117: }
118:
119: static int
120: asn1pars_opt_strparse(char *arg)
121: {
122: if (sk_OPENSSL_STRING_push(asn1pars_config.osk, arg) == 0) {
123: fprintf(stderr, "-strparse cannot add argument\n");
124: return (-1);
125: }
126: return (0);
127: }
128:
129: static struct option asn1pars_options[] = {
130: {
131: .name = "dump",
132: .desc = "Dump unknown data in hex form",
133: .type = OPTION_VALUE,
134: .value = -1,
135: .opt.value = &asn1pars_config.dump,
136: },
137: {
138: .name = "dlimit",
139: .argname = "num",
140: .desc = "Dump the first num bytes of unknown data in hex form",
141: .type = OPTION_ARG_FUNC,
142: .opt.argfunc = asn1pars_opt_dlimit,
143: },
144: {
145: .name = "genconf",
146: .argname = "file",
147: .desc = "File to generate ASN.1 structure from",
148: .type = OPTION_ARG,
149: .opt.arg = &asn1pars_config.genconf,
150: },
151: {
152: .name = "genstr",
153: .argname = "string",
154: .desc = "String to generate ASN.1 structure from",
155: .type = OPTION_ARG,
156: .opt.arg = &asn1pars_config.genstr,
157: },
158: {
159: .name = "i",
160: .desc = "Indent output according to depth of structures",
161: .type = OPTION_FLAG,
162: .opt.flag = &asn1pars_config.indent,
163: },
164: {
165: .name = "in",
166: .argname = "file",
167: .desc = "The input file (default stdin)",
168: .type = OPTION_ARG,
169: .opt.arg = &asn1pars_config.infile,
170: },
171: {
172: .name = "inform",
173: .argname = "fmt",
174: .desc = "Input format (DER, TXT or PEM (default))",
175: .type = OPTION_ARG_FORMAT,
176: .opt.value = &asn1pars_config.informat,
177: },
178: {
179: .name = "length",
180: .argname = "num",
181: .desc = "Number of bytes to parse (default until EOF)",
182: .type = OPTION_ARG_FUNC,
183: .opt.argfunc = asn1pars_opt_length,
184: },
185: {
186: .name = "noout",
187: .desc = "Do not produce any output",
188: .type = OPTION_FLAG,
189: .opt.flag = &asn1pars_config.noout,
190: },
191: {
192: .name = "offset",
193: .argname = "num",
194: .desc = "Offset to begin parsing",
195: .type = OPTION_ARG_INT,
196: .opt.value = &asn1pars_config.offset,
197: },
198: {
199: .name = "oid",
200: .argname = "file",
201: .desc = "File containing additional object identifiers (OIDs)",
202: .type = OPTION_ARG,
203: .opt.arg = &asn1pars_config.oidfile,
204: },
205: {
206: .name = "out",
207: .argname = "file",
208: .desc = "Output file in DER format",
209: .type = OPTION_ARG,
210: .opt.arg = &asn1pars_config.derfile,
211: },
212: {
213: .name = "strparse",
214: .argname = "offset",
215: .desc = "Parse the content octets of ASN.1 object starting at"
216: " offset",
217: .type = OPTION_ARG_FUNC,
218: .opt.argfunc = asn1pars_opt_strparse,
219: },
220: { NULL },
221: };
1.1 jsing 222:
1.3 doug 223: static void
224: asn1pars_usage()
225: {
226: fprintf(stderr,
227: "usage: asn1parse [-i] [-dlimit num] [-dump] [-genconf file] "
228: "[-genstr string]\n"
229: " [-in file] [-inform fmt] [-length num] [-noout] [-offset num] "
230: "[-oid file]\n"
231: " [-out file] [-strparse offset]\n\n");
232: options_usage(asn1pars_options);
233: }
1.1 jsing 234:
1.3 doug 235: static int do_generate(BIO *bio, char *genstr, char *genconf, BUF_MEM *buf);
1.1 jsing 236:
237: int
238: asn1parse_main(int argc, char **argv)
239: {
1.3 doug 240: int i, j, ret = 1;
1.1 jsing 241: long num, tmplen;
242: BIO *in = NULL, *out = NULL, *b64 = NULL, *derout = NULL;
1.3 doug 243: char *str = NULL;
1.1 jsing 244: const char *errstr = NULL;
245: unsigned char *tmpbuf;
246: const unsigned char *ctmpbuf;
247: BUF_MEM *buf = NULL;
248: ASN1_TYPE *at = NULL;
1.5 doug 249:
250: if (single_execution) {
1.7 deraadt 251: if (pledge("stdio cpath wpath rpath", NULL) == -1) {
1.5 doug 252: perror("pledge");
1.6 doug 253: exit(1);
254: }
1.5 doug 255: }
1.1 jsing 256:
1.3 doug 257: memset(&asn1pars_config, 0, sizeof(asn1pars_config));
1.1 jsing 258:
1.3 doug 259: asn1pars_config.informat = FORMAT_PEM;
260: if ((asn1pars_config.osk = sk_OPENSSL_STRING_new_null()) == NULL) {
1.1 jsing 261: BIO_printf(bio_err, "Memory allocation failure\n");
262: goto end;
263: }
264:
1.3 doug 265: if (options_parse(argc, argv, asn1pars_options, NULL, NULL) != 0) {
266: asn1pars_usage();
267: return (1);
1.1 jsing 268: }
269:
270: in = BIO_new(BIO_s_file());
271: out = BIO_new(BIO_s_file());
272: if ((in == NULL) || (out == NULL)) {
273: ERR_print_errors(bio_err);
274: goto end;
275: }
276: BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT);
277:
1.3 doug 278: if (asn1pars_config.oidfile != NULL) {
279: if (BIO_read_filename(in, asn1pars_config.oidfile) <= 0) {
280: BIO_printf(bio_err, "problems opening %s\n",
281: asn1pars_config.oidfile);
1.1 jsing 282: ERR_print_errors(bio_err);
283: goto end;
284: }
285: OBJ_create_objects(in);
286: }
1.3 doug 287: if (asn1pars_config.infile == NULL)
1.1 jsing 288: BIO_set_fp(in, stdin, BIO_NOCLOSE);
289: else {
1.3 doug 290: if (BIO_read_filename(in, asn1pars_config.infile) <= 0) {
291: perror(asn1pars_config.infile);
1.1 jsing 292: goto end;
293: }
294: }
295:
1.3 doug 296: if (asn1pars_config.derfile) {
297: if (!(derout = BIO_new_file(asn1pars_config.derfile, "wb"))) {
298: BIO_printf(bio_err, "problems opening %s\n",
299: asn1pars_config.derfile);
1.1 jsing 300: ERR_print_errors(bio_err);
301: goto end;
302: }
303: }
304: if ((buf = BUF_MEM_new()) == NULL)
305: goto end;
306: if (!BUF_MEM_grow(buf, BUFSIZ * 8))
307: goto end; /* Pre-allocate :-) */
308:
1.3 doug 309: if (asn1pars_config.genstr || asn1pars_config.genconf) {
310: num = do_generate(bio_err, asn1pars_config.genstr,
311: asn1pars_config.genconf, buf);
1.1 jsing 312: if (num < 0) {
313: ERR_print_errors(bio_err);
314: goto end;
315: }
316: } else {
317:
1.3 doug 318: if (asn1pars_config.informat == FORMAT_PEM) {
1.1 jsing 319: BIO *tmp;
320:
321: if ((b64 = BIO_new(BIO_f_base64())) == NULL)
322: goto end;
323: BIO_push(b64, in);
324: tmp = in;
325: in = b64;
326: b64 = tmp;
327: }
328: num = 0;
329: for (;;) {
330: if (!BUF_MEM_grow(buf, (int) num + BUFSIZ))
331: goto end;
332: i = BIO_read(in, &(buf->data[num]), BUFSIZ);
333: if (i <= 0)
334: break;
335: num += i;
336: }
337: }
338: str = buf->data;
339:
340: /* If any structs to parse go through in sequence */
341:
1.3 doug 342: if (sk_OPENSSL_STRING_num(asn1pars_config.osk)) {
1.1 jsing 343: tmpbuf = (unsigned char *) str;
344: tmplen = num;
1.3 doug 345: for (i = 0; i < sk_OPENSSL_STRING_num(asn1pars_config.osk);
346: i++) {
1.1 jsing 347: ASN1_TYPE *atmp;
348: int typ;
1.3 doug 349: j = strtonum(
350: sk_OPENSSL_STRING_value(asn1pars_config.osk, i),
1.1 jsing 351: 1, INT_MAX, &errstr);
352: if (errstr) {
353: BIO_printf(bio_err,
354: "'%s' is an invalid number: %s\n",
1.3 doug 355: sk_OPENSSL_STRING_value(asn1pars_config.osk,
356: i), errstr);
1.1 jsing 357: continue;
358: }
359: tmpbuf += j;
360: tmplen -= j;
361: atmp = at;
362: ctmpbuf = tmpbuf;
363: at = d2i_ASN1_TYPE(NULL, &ctmpbuf, tmplen);
364: ASN1_TYPE_free(atmp);
365: if (!at) {
366: BIO_printf(bio_err, "Error parsing structure\n");
367: ERR_print_errors(bio_err);
368: goto end;
369: }
370: typ = ASN1_TYPE_get(at);
371: if ((typ == V_ASN1_OBJECT) ||
372: (typ == V_ASN1_NULL)) {
373: BIO_printf(bio_err, "Can't parse %s type\n",
374: typ == V_ASN1_NULL ? "NULL" : "OBJECT");
375: ERR_print_errors(bio_err);
376: goto end;
377: }
378: /* hmm... this is a little evil but it works */
379: tmpbuf = at->value.asn1_string->data;
380: tmplen = at->value.asn1_string->length;
381: }
382: str = (char *) tmpbuf;
383: num = tmplen;
384: }
1.3 doug 385: if (asn1pars_config.offset >= num) {
1.1 jsing 386: BIO_printf(bio_err, "Error: offset too large\n");
387: goto end;
388: }
1.3 doug 389: num -= asn1pars_config.offset;
1.1 jsing 390:
1.3 doug 391: if ((asn1pars_config.length == 0) ||
392: ((long)asn1pars_config.length > num))
393: asn1pars_config.length = (unsigned int) num;
1.1 jsing 394: if (derout) {
1.3 doug 395: if (BIO_write(derout, str + asn1pars_config.offset,
396: asn1pars_config.length) != (int)asn1pars_config.length) {
1.1 jsing 397: BIO_printf(bio_err, "Error writing output\n");
398: ERR_print_errors(bio_err);
399: goto end;
400: }
401: }
1.3 doug 402: if (!asn1pars_config.noout &&
403: !ASN1_parse_dump(out,
404: (unsigned char *)&(str[asn1pars_config.offset]),
405: asn1pars_config.length, asn1pars_config.indent,
406: asn1pars_config.dump)) {
1.1 jsing 407: ERR_print_errors(bio_err);
408: goto end;
409: }
410: ret = 0;
411: end:
412: BIO_free(derout);
1.3 doug 413: BIO_free(in);
414: BIO_free_all(out);
415: BIO_free(b64);
1.1 jsing 416: if (ret != 0)
417: ERR_print_errors(bio_err);
1.3 doug 418: BUF_MEM_free(buf);
1.8 ! jsing 419: ASN1_TYPE_free(at);
1.3 doug 420: sk_OPENSSL_STRING_free(asn1pars_config.osk);
1.1 jsing 421: OBJ_cleanup();
422:
423: return (ret);
424: }
425:
426: static int
427: do_generate(BIO * bio, char *genstr, char *genconf, BUF_MEM * buf)
428: {
429: CONF *cnf = NULL;
430: int len;
431: long errline;
432: unsigned char *p;
433: ASN1_TYPE *atyp = NULL;
434:
435: if (genconf) {
436: cnf = NCONF_new(NULL);
437: if (!NCONF_load(cnf, genconf, &errline))
438: goto conferr;
439: if (!genstr)
440: genstr = NCONF_get_string(cnf, "default", "asn1");
441: if (!genstr) {
442: BIO_printf(bio, "Can't find 'asn1' in '%s'\n", genconf);
443: goto err;
444: }
445: }
446: atyp = ASN1_generate_nconf(genstr, cnf);
447: NCONF_free(cnf);
448: cnf = NULL;
449:
450: if (!atyp)
451: return -1;
452:
453: len = i2d_ASN1_TYPE(atyp, NULL);
454: if (len <= 0)
455: goto err;
456:
457: if (!BUF_MEM_grow(buf, len))
458: goto err;
459:
460: p = (unsigned char *) buf->data;
461:
462: i2d_ASN1_TYPE(atyp, &p);
463:
464: ASN1_TYPE_free(atyp);
465: return len;
466:
467: conferr:
468:
469: if (errline > 0)
470: BIO_printf(bio, "Error on line %ld of config file '%s'\n",
471: errline, genconf);
472: else
473: BIO_printf(bio, "Error loading config file '%s'\n", genconf);
474:
475: err:
476: NCONF_free(cnf);
477: ASN1_TYPE_free(atyp);
478:
479: return -1;
480:
481: }
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