| /* |
| * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. |
| * |
| * Licensed under the OpenSSL license (the "License"). You may not use |
| * this file except in compliance with the License. You can obtain a copy |
| * in the file LICENSE in the source distribution or at |
| * https://www.openssl.org/source/license.html |
| */ |
| |
| /* |
| * A nice addition from Dr Stephen Henson <steve@openssl.org> to add the |
| * -strparse option which parses nested binary structures |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include "apps.h" |
| #include <openssl/err.h> |
| #include <openssl/evp.h> |
| #include <openssl/x509.h> |
| #include <openssl/pem.h> |
| #include <openssl/asn1t.h> |
| |
| typedef enum OPTION_choice { |
| OPT_ERR = -1, OPT_EOF = 0, OPT_HELP, |
| OPT_INFORM, OPT_IN, OPT_OUT, OPT_INDENT, OPT_NOOUT, |
| OPT_OID, OPT_OFFSET, OPT_LENGTH, OPT_DUMP, OPT_DLIMIT, |
| OPT_STRPARSE, OPT_GENSTR, OPT_GENCONF, OPT_STRICTPEM, |
| OPT_ITEM |
| } OPTION_CHOICE; |
| |
| const OPTIONS asn1parse_options[] = { |
| {"help", OPT_HELP, '-', "Display this summary"}, |
| {"inform", OPT_INFORM, 'F', "input format - one of DER PEM"}, |
| {"in", OPT_IN, '<', "input file"}, |
| {"out", OPT_OUT, '>', "output file (output format is always DER)"}, |
| {"i", OPT_INDENT, 0, "indents the output"}, |
| {"noout", OPT_NOOUT, 0, "do not produce any output"}, |
| {"offset", OPT_OFFSET, 'p', "offset into file"}, |
| {"length", OPT_LENGTH, 'p', "length of section in file"}, |
| {"oid", OPT_OID, '<', "file of extra oid definitions"}, |
| {"dump", OPT_DUMP, 0, "unknown data in hex form"}, |
| {"dlimit", OPT_DLIMIT, 'p', |
| "dump the first arg bytes of unknown data in hex form"}, |
| {"strparse", OPT_STRPARSE, 's', |
| "offset; a series of these can be used to 'dig'"}, |
| {OPT_MORE_STR, 0, 0, "into multiple ASN1 blob wrappings"}, |
| {"genstr", OPT_GENSTR, 's', "string to generate ASN1 structure from"}, |
| {"genconf", OPT_GENCONF, 's', "file to generate ASN1 structure from"}, |
| {OPT_MORE_STR, 0, 0, "(-inform will be ignored)"}, |
| {"strictpem", OPT_STRICTPEM, 0, |
| "do not attempt base64 decode outside PEM markers"}, |
| {"item", OPT_ITEM, 's', "item to parse and print"}, |
| {NULL} |
| }; |
| |
| static int do_generate(char *genstr, const char *genconf, BUF_MEM *buf); |
| |
| int asn1parse_main(int argc, char **argv) |
| { |
| ASN1_TYPE *at = NULL; |
| BIO *in = NULL, *b64 = NULL, *derout = NULL; |
| BUF_MEM *buf = NULL; |
| STACK_OF(OPENSSL_STRING) *osk = NULL; |
| char *genstr = NULL, *genconf = NULL; |
| char *infile = NULL, *oidfile = NULL, *derfile = NULL; |
| unsigned char *str = NULL; |
| char *name = NULL, *header = NULL, *prog; |
| const unsigned char *ctmpbuf; |
| int indent = 0, noout = 0, dump = 0, strictpem = 0, informat = FORMAT_PEM; |
| int offset = 0, ret = 1, i, j; |
| long num, tmplen; |
| unsigned char *tmpbuf; |
| unsigned int length = 0; |
| OPTION_CHOICE o; |
| const ASN1_ITEM *it = NULL; |
| |
| prog = opt_init(argc, argv, asn1parse_options); |
| |
| if ((osk = sk_OPENSSL_STRING_new_null()) == NULL) { |
| BIO_printf(bio_err, "%s: Memory allocation failure\n", prog); |
| goto end; |
| } |
| |
| while ((o = opt_next()) != OPT_EOF) { |
| switch (o) { |
| case OPT_EOF: |
| case OPT_ERR: |
| opthelp: |
| BIO_printf(bio_err, "%s: Use -help for summary.\n", prog); |
| goto end; |
| case OPT_HELP: |
| opt_help(asn1parse_options); |
| ret = 0; |
| goto end; |
| case OPT_INFORM: |
| if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat)) |
| goto opthelp; |
| break; |
| case OPT_IN: |
| infile = opt_arg(); |
| break; |
| case OPT_OUT: |
| derfile = opt_arg(); |
| break; |
| case OPT_INDENT: |
| indent = 1; |
| break; |
| case OPT_NOOUT: |
| noout = 1; |
| break; |
| case OPT_OID: |
| oidfile = opt_arg(); |
| break; |
| case OPT_OFFSET: |
| offset = strtol(opt_arg(), NULL, 0); |
| break; |
| case OPT_LENGTH: |
| length = atoi(opt_arg()); |
| break; |
| case OPT_DUMP: |
| dump = -1; |
| break; |
| case OPT_DLIMIT: |
| dump = atoi(opt_arg()); |
| break; |
| case OPT_STRPARSE: |
| sk_OPENSSL_STRING_push(osk, opt_arg()); |
| break; |
| case OPT_GENSTR: |
| genstr = opt_arg(); |
| break; |
| case OPT_GENCONF: |
| genconf = opt_arg(); |
| break; |
| case OPT_STRICTPEM: |
| strictpem = 1; |
| informat = FORMAT_PEM; |
| break; |
| case OPT_ITEM: |
| it = ASN1_ITEM_lookup(opt_arg()); |
| if (it == NULL) { |
| size_t tmp; |
| |
| BIO_printf(bio_err, "Unknown item name %s\n", opt_arg()); |
| BIO_puts(bio_err, "Supported types:\n"); |
| for (tmp = 0;; tmp++) { |
| it = ASN1_ITEM_get(tmp); |
| if (it == NULL) |
| break; |
| BIO_printf(bio_err, " %s\n", it->sname); |
| } |
| goto end; |
| } |
| break; |
| } |
| } |
| argc = opt_num_rest(); |
| if (argc != 0) |
| goto opthelp; |
| |
| if (oidfile != NULL) { |
| in = bio_open_default(oidfile, 'r', FORMAT_TEXT); |
| if (in == NULL) |
| goto end; |
| OBJ_create_objects(in); |
| BIO_free(in); |
| } |
| |
| if ((in = bio_open_default(infile, 'r', informat)) == NULL) |
| goto end; |
| |
| if (derfile && (derout = bio_open_default(derfile, 'w', FORMAT_ASN1)) == NULL) |
| goto end; |
| |
| if (strictpem) { |
| if (PEM_read_bio(in, &name, &header, &str, &num) != |
| 1) { |
| BIO_printf(bio_err, "Error reading PEM file\n"); |
| ERR_print_errors(bio_err); |
| goto end; |
| } |
| } else { |
| |
| if ((buf = BUF_MEM_new()) == NULL) |
| goto end; |
| if (!BUF_MEM_grow(buf, BUFSIZ * 8)) |
| goto end; /* Pre-allocate :-) */ |
| |
| if (genstr || genconf) { |
| num = do_generate(genstr, genconf, buf); |
| if (num < 0) { |
| ERR_print_errors(bio_err); |
| goto end; |
| } |
| } |
| |
| else { |
| |
| if (informat == FORMAT_PEM) { |
| BIO *tmp; |
| |
| if ((b64 = BIO_new(BIO_f_base64())) == NULL) |
| goto end; |
| BIO_push(b64, in); |
| tmp = in; |
| in = b64; |
| b64 = tmp; |
| } |
| |
| num = 0; |
| for (;;) { |
| if (!BUF_MEM_grow(buf, (int)num + BUFSIZ)) |
| goto end; |
| i = BIO_read(in, &(buf->data[num]), BUFSIZ); |
| if (i <= 0) |
| break; |
| num += i; |
| } |
| } |
| str = (unsigned char *)buf->data; |
| |
| } |
| |
| /* If any structs to parse go through in sequence */ |
| |
| if (sk_OPENSSL_STRING_num(osk)) { |
| tmpbuf = str; |
| tmplen = num; |
| for (i = 0; i < sk_OPENSSL_STRING_num(osk); i++) { |
| ASN1_TYPE *atmp; |
| int typ; |
| j = atoi(sk_OPENSSL_STRING_value(osk, i)); |
| if (j == 0) { |
| BIO_printf(bio_err, "'%s' is an invalid number\n", |
| sk_OPENSSL_STRING_value(osk, i)); |
| continue; |
| } |
| tmpbuf += j; |
| tmplen -= j; |
| atmp = at; |
| ctmpbuf = tmpbuf; |
| at = d2i_ASN1_TYPE(NULL, &ctmpbuf, tmplen); |
| ASN1_TYPE_free(atmp); |
| if (!at) { |
| BIO_printf(bio_err, "Error parsing structure\n"); |
| ERR_print_errors(bio_err); |
| goto end; |
| } |
| typ = ASN1_TYPE_get(at); |
| if ((typ == V_ASN1_OBJECT) |
| || (typ == V_ASN1_BOOLEAN) |
| || (typ == V_ASN1_NULL)) { |
| BIO_printf(bio_err, "Can't parse %s type\n", ASN1_tag2str(typ)); |
| ERR_print_errors(bio_err); |
| goto end; |
| } |
| /* hmm... this is a little evil but it works */ |
| tmpbuf = at->value.asn1_string->data; |
| tmplen = at->value.asn1_string->length; |
| } |
| str = tmpbuf; |
| num = tmplen; |
| } |
| |
| if (offset >= num) { |
| BIO_printf(bio_err, "Error: offset too large\n"); |
| goto end; |
| } |
| |
| num -= offset; |
| |
| if ((length == 0) || ((long)length > num)) |
| length = (unsigned int)num; |
| if (derout) { |
| if (BIO_write(derout, str + offset, length) != (int)length) { |
| BIO_printf(bio_err, "Error writing output\n"); |
| ERR_print_errors(bio_err); |
| goto end; |
| } |
| } |
| if (!noout) { |
| const unsigned char *p = str + offset; |
| |
| if (it != NULL) { |
| ASN1_VALUE *value = ASN1_item_d2i(NULL, &p, length, it); |
| if (value == NULL) { |
| BIO_printf(bio_err, "Error parsing item %s\n", it->sname); |
| ERR_print_errors(bio_err); |
| goto end; |
| } |
| ASN1_item_print(bio_out, value, 0, it, NULL); |
| ASN1_item_free(value, it); |
| } else { |
| if (!ASN1_parse_dump(bio_out, p, length, indent, dump)) { |
| ERR_print_errors(bio_err); |
| goto end; |
| } |
| } |
| } |
| ret = 0; |
| end: |
| BIO_free(derout); |
| BIO_free(in); |
| BIO_free(b64); |
| if (ret != 0) |
| ERR_print_errors(bio_err); |
| BUF_MEM_free(buf); |
| OPENSSL_free(name); |
| OPENSSL_free(header); |
| if (strictpem) |
| OPENSSL_free(str); |
| ASN1_TYPE_free(at); |
| sk_OPENSSL_STRING_free(osk); |
| return (ret); |
| } |
| |
| static int do_generate(char *genstr, const char *genconf, BUF_MEM *buf) |
| { |
| CONF *cnf = NULL; |
| int len; |
| unsigned char *p; |
| ASN1_TYPE *atyp = NULL; |
| |
| if (genconf) { |
| if ((cnf = app_load_config(genconf)) == NULL) |
| goto err; |
| if (!genstr) |
| genstr = NCONF_get_string(cnf, "default", "asn1"); |
| if (!genstr) { |
| BIO_printf(bio_err, "Can't find 'asn1' in '%s'\n", genconf); |
| goto err; |
| } |
| } |
| |
| atyp = ASN1_generate_nconf(genstr, cnf); |
| NCONF_free(cnf); |
| cnf = NULL; |
| |
| if (!atyp) |
| return -1; |
| |
| len = i2d_ASN1_TYPE(atyp, NULL); |
| |
| if (len <= 0) |
| goto err; |
| |
| if (!BUF_MEM_grow(buf, len)) |
| goto err; |
| |
| p = (unsigned char *)buf->data; |
| |
| i2d_ASN1_TYPE(atyp, &p); |
| |
| ASN1_TYPE_free(atyp); |
| return len; |
| |
| err: |
| NCONF_free(cnf); |
| ASN1_TYPE_free(atyp); |
| return -1; |
| } |
