2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 * A nice addition from Dr Stephen Henson <steve@openssl.org> to add the
12 * -strparse option which parses nested binary structures
19 #include <openssl/err.h>
20 #include <openssl/evp.h>
21 #include <openssl/x509.h>
22 #include <openssl/pem.h>
23 #include <openssl/asn1t.h>
25 typedef enum OPTION_choice {
26 OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
27 OPT_INFORM, OPT_IN, OPT_OUT, OPT_INDENT, OPT_NOOUT,
28 OPT_OID, OPT_OFFSET, OPT_LENGTH, OPT_DUMP, OPT_DLIMIT,
29 OPT_STRPARSE, OPT_GENSTR, OPT_GENCONF, OPT_STRICTPEM,
33 const OPTIONS asn1parse_options[] = {
34 {"help", OPT_HELP, '-', "Display this summary"},
35 {"inform", OPT_INFORM, 'F', "input format - one of DER PEM"},
36 {"in", OPT_IN, '<', "input file"},
37 {"out", OPT_OUT, '>', "output file (output format is always DER)"},
38 {"i", OPT_INDENT, 0, "indents the output"},
39 {"noout", OPT_NOOUT, 0, "do not produce any output"},
40 {"offset", OPT_OFFSET, 'p', "offset into file"},
41 {"length", OPT_LENGTH, 'p', "length of section in file"},
42 {"oid", OPT_OID, '<', "file of extra oid definitions"},
43 {"dump", OPT_DUMP, 0, "unknown data in hex form"},
44 {"dlimit", OPT_DLIMIT, 'p',
45 "dump the first arg bytes of unknown data in hex form"},
46 {"strparse", OPT_STRPARSE, 's',
47 "offset; a series of these can be used to 'dig'"},
48 {OPT_MORE_STR, 0, 0, "into multiple ASN1 blob wrappings"},
49 {"genstr", OPT_GENSTR, 's', "string to generate ASN1 structure from"},
50 {"genconf", OPT_GENCONF, 's', "file to generate ASN1 structure from"},
51 {OPT_MORE_STR, 0, 0, "(-inform will be ignored)"},
52 {"strictpem", OPT_STRICTPEM, 0,
53 "do not attempt base64 decode outside PEM markers"},
54 {"item", OPT_ITEM, 's', "item to parse and print"},
58 static int do_generate(char *genstr, const char *genconf, BUF_MEM *buf);
60 int asn1parse_main(int argc, char **argv)
63 BIO *in = NULL, *b64 = NULL, *derout = NULL;
65 STACK_OF(OPENSSL_STRING) *osk = NULL;
66 char *genstr = NULL, *genconf = NULL;
67 char *infile = NULL, *oidfile = NULL, *derfile = NULL;
68 unsigned char *str = NULL;
69 char *name = NULL, *header = NULL, *prog;
70 const unsigned char *ctmpbuf;
71 int indent = 0, noout = 0, dump = 0, strictpem = 0, informat = FORMAT_PEM;
72 int offset = 0, ret = 1, i, j;
74 unsigned char *tmpbuf;
75 unsigned int length = 0;
77 const ASN1_ITEM *it = NULL;
79 prog = opt_init(argc, argv, asn1parse_options);
81 if ((osk = sk_OPENSSL_STRING_new_null()) == NULL) {
82 BIO_printf(bio_err, "%s: Memory allocation failure\n", prog);
86 while ((o = opt_next()) != OPT_EOF) {
91 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
94 opt_help(asn1parse_options);
98 if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
117 offset = strtol(opt_arg(), NULL, 0);
120 length = atoi(opt_arg());
126 dump = atoi(opt_arg());
129 sk_OPENSSL_STRING_push(osk, opt_arg());
139 informat = FORMAT_PEM;
142 it = ASN1_ITEM_lookup(opt_arg());
146 BIO_printf(bio_err, "Unknown item name %s\n", opt_arg());
147 BIO_puts(bio_err, "Supported types:\n");
148 for (tmp = 0;; tmp++) {
149 it = ASN1_ITEM_get(tmp);
152 BIO_printf(bio_err, " %s\n", it->sname);
159 argc = opt_num_rest();
163 if (oidfile != NULL) {
164 in = bio_open_default(oidfile, 'r', FORMAT_TEXT);
167 OBJ_create_objects(in);
171 if ((in = bio_open_default(infile, 'r', informat)) == NULL)
174 if (derfile && (derout = bio_open_default(derfile, 'w', FORMAT_ASN1)) == NULL)
178 if (PEM_read_bio(in, &name, &header, &str, &num) !=
180 BIO_printf(bio_err, "Error reading PEM file\n");
181 ERR_print_errors(bio_err);
186 if ((buf = BUF_MEM_new()) == NULL)
188 if (!BUF_MEM_grow(buf, BUFSIZ * 8))
189 goto end; /* Pre-allocate :-) */
191 if (genstr || genconf) {
192 num = do_generate(genstr, genconf, buf);
194 ERR_print_errors(bio_err);
201 if (informat == FORMAT_PEM) {
204 if ((b64 = BIO_new(BIO_f_base64())) == NULL)
214 if (!BUF_MEM_grow(buf, (int)num + BUFSIZ))
216 i = BIO_read(in, &(buf->data[num]), BUFSIZ);
222 str = (unsigned char *)buf->data;
226 /* If any structs to parse go through in sequence */
228 if (sk_OPENSSL_STRING_num(osk)) {
231 for (i = 0; i < sk_OPENSSL_STRING_num(osk); i++) {
234 j = atoi(sk_OPENSSL_STRING_value(osk, i));
236 BIO_printf(bio_err, "'%s' is an invalid number\n",
237 sk_OPENSSL_STRING_value(osk, i));
244 at = d2i_ASN1_TYPE(NULL, &ctmpbuf, tmplen);
245 ASN1_TYPE_free(atmp);
247 BIO_printf(bio_err, "Error parsing structure\n");
248 ERR_print_errors(bio_err);
251 typ = ASN1_TYPE_get(at);
252 if ((typ == V_ASN1_OBJECT)
253 || (typ == V_ASN1_BOOLEAN)
254 || (typ == V_ASN1_NULL)) {
255 BIO_printf(bio_err, "Can't parse %s type\n", ASN1_tag2str(typ));
256 ERR_print_errors(bio_err);
259 /* hmm... this is a little evil but it works */
260 tmpbuf = at->value.asn1_string->data;
261 tmplen = at->value.asn1_string->length;
268 BIO_printf(bio_err, "Error: offset too large\n");
274 if ((length == 0) || ((long)length > num))
275 length = (unsigned int)num;
277 if (BIO_write(derout, str + offset, length) != (int)length) {
278 BIO_printf(bio_err, "Error writing output\n");
279 ERR_print_errors(bio_err);
284 const unsigned char *p = str + offset;
287 ASN1_VALUE *value = ASN1_item_d2i(NULL, &p, length, it);
289 BIO_printf(bio_err, "Error parsing item %s\n", it->sname);
290 ERR_print_errors(bio_err);
293 ASN1_item_print(bio_out, value, 0, it, NULL);
294 ASN1_item_free(value, it);
296 if (!ASN1_parse_dump(bio_out, p, length, indent, dump)) {
297 ERR_print_errors(bio_err);
308 ERR_print_errors(bio_err);
311 OPENSSL_free(header);
315 sk_OPENSSL_STRING_free(osk);
319 static int do_generate(char *genstr, const char *genconf, BUF_MEM *buf)
324 ASN1_TYPE *atyp = NULL;
327 if ((cnf = app_load_config(genconf)) == NULL)
330 genstr = NCONF_get_string(cnf, "default", "asn1");
332 BIO_printf(bio_err, "Can't find 'asn1' in '%s'\n", genconf);
337 atyp = ASN1_generate_nconf(genstr, cnf);
344 len = i2d_ASN1_TYPE(atyp, NULL);
349 if (!BUF_MEM_grow(buf, len))
352 p = (unsigned char *)buf->data;
354 i2d_ASN1_TYPE(atyp, &p);
356 ASN1_TYPE_free(atyp);
361 ASN1_TYPE_free(atyp);