asn1pars.c

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/* apps/asn1pars.c */
/* Copyright (C) 1995-1998 Eric Young ([email protected])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([email protected]).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson ([email protected]).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young ([email protected])"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson ([email protected])"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

/* A nice addition from Dr Stephen Henson <[email protected]> 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>

/* -inform arg  - input format - default PEM (DER or PEM)
 * -in arg  - input file - default stdin
 * -i       - indent the details by depth
 * -offset  - where in the file to start
 * -length  - how many bytes to use
 * -oid file    - extra oid description file
 */

#undef PROG
#define PROG    asn1parse_main

int MAIN(int, char **);

static int do_generate(BIO *bio, char *genstr, char *genconf, BUF_MEM *buf);

int MAIN(int argc, char **argv)
    {
    int i,badops=0,offset=0,ret=1,j;
    unsigned int length=0;
    long num,tmplen;
    BIO *in=NULL,*out=NULL,*b64=NULL, *derout = NULL;
    int informat,indent=0, noout = 0, dump = 0;
    char *infile=NULL,*str=NULL,*prog,*oidfile=NULL, *derfile=NULL;
    char *genstr=NULL, *genconf=NULL;
    unsigned char *tmpbuf;
    const unsigned char *ctmpbuf;
    BUF_MEM *buf=NULL;
    STACK_OF(OPENSSL_STRING) *osk=NULL;
    ASN1_TYPE *at=NULL;

    informat=FORMAT_PEM;

    apps_startup();

    if (bio_err == NULL)
        if ((bio_err=BIO_new(BIO_s_file())) != NULL)
            BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);

    if (!load_config(bio_err, NULL))
        goto end;

    prog=argv[0];
    argc--;
    argv++;
    if ((osk=sk_OPENSSL_STRING_new_null()) == NULL)
        {
        BIO_printf(bio_err,"Memory allocation failure\n");
        goto end;
        }
    while (argc >= 1)
        {
        if  (strcmp(*argv,"-inform") == 0)
            {
            if (--argc < 1) goto bad;
            informat=str2fmt(*(++argv));
            }
        else if (strcmp(*argv,"-in") == 0)
            {
            if (--argc < 1) goto bad;
            infile= *(++argv);
            }
        else if (strcmp(*argv,"-out") == 0)
            {
            if (--argc < 1) goto bad;
            derfile= *(++argv);
            }
        else if (strcmp(*argv,"-i") == 0)
            {
            indent=1;
            }
        else if (strcmp(*argv,"-noout") == 0) noout = 1;
        else if (strcmp(*argv,"-oid") == 0)
            {
            if (--argc < 1) goto bad;
            oidfile= *(++argv);
            }
        else if (strcmp(*argv,"-offset") == 0)
            {
            if (--argc < 1) goto bad;
            offset= atoi(*(++argv));
            }
        else if (strcmp(*argv,"-length") == 0)
            {
            if (--argc < 1) goto bad;
            length= atoi(*(++argv));
            if (length == 0) goto bad;
            }
        else if (strcmp(*argv,"-dump") == 0)
            {
            dump= -1;
            }
        else if (strcmp(*argv,"-dlimit") == 0)
            {
            if (--argc < 1) goto bad;
            dump= atoi(*(++argv));
            if (dump <= 0) goto bad;
            }
        else if (strcmp(*argv,"-strparse") == 0)
            {
            if (--argc < 1) goto bad;
            sk_OPENSSL_STRING_push(osk,*(++argv));
            }
        else if (strcmp(*argv,"-genstr") == 0)
            {
            if (--argc < 1) goto bad;
            genstr= *(++argv);
            }
        else if (strcmp(*argv,"-genconf") == 0)
            {
            if (--argc < 1) goto bad;
            genconf= *(++argv);
            }
        else
            {
            BIO_printf(bio_err,"unknown option %s\n",*argv);
            badops=1;
            break;
            }
        argc--;
        argv++;
        }

    if (badops)
        {
bad:
        BIO_printf(bio_err,"%s [options] <infile\n",prog);
        BIO_printf(bio_err,"where options are\n");
        BIO_printf(bio_err," -inform arg   input format - one of DER PEM\n");
        BIO_printf(bio_err," -in arg       input file\n");
        BIO_printf(bio_err," -out arg      output file (output format is always DER\n");
        BIO_printf(bio_err," -noout arg    don't produce any output\n");
        BIO_printf(bio_err," -offset arg   offset into file\n");
        BIO_printf(bio_err," -length arg   length of section in file\n");
        BIO_printf(bio_err," -i            indent entries\n");
        BIO_printf(bio_err," -dump         dump unknown data in hex form\n");
        BIO_printf(bio_err," -dlimit arg   dump the first arg bytes of unknown data in hex form\n");
        BIO_printf(bio_err," -oid file     file of extra oid definitions\n");
        BIO_printf(bio_err," -strparse offset\n");
        BIO_printf(bio_err,"               a series of these can be used to 'dig' into multiple\n");
        BIO_printf(bio_err,"               ASN1 blob wrappings\n");
        BIO_printf(bio_err," -genstr str   string to generate ASN1 structure from\n");
        BIO_printf(bio_err," -genconf file file to generate ASN1 structure from\n");
        goto end;
        }

    ERR_load_crypto_strings();

    in=BIO_new(BIO_s_file());
    out=BIO_new(BIO_s_file());
    if ((in == NULL) || (out == NULL))
        {
        ERR_print_errors(bio_err);
        goto end;
        }
    BIO_set_fp(out,stdout,BIO_NOCLOSE|BIO_FP_TEXT);
#ifdef OPENSSL_SYS_VMS
    {
    BIO *tmpbio = BIO_new(BIO_f_linebuffer());
    out = BIO_push(tmpbio, out);
    }
#endif

    if (oidfile != NULL)
        {
        if (BIO_read_filename(in,oidfile) <= 0)
            {
            BIO_printf(bio_err,"problems opening %s\n",oidfile);
            ERR_print_errors(bio_err);
            goto end;
            }
        OBJ_create_objects(in);
        }

    if (infile == NULL)
        BIO_set_fp(in,stdin,BIO_NOCLOSE);
    else
        {
        if (BIO_read_filename(in,infile) <= 0)
            {
            perror(infile);
            goto end;
            }
        }

    if (derfile) {
        if(!(derout = BIO_new_file(derfile, "wb"))) {
            BIO_printf(bio_err,"problems opening %s\n",derfile);
            ERR_print_errors(bio_err);
            goto end;
        }
    }

    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(bio_err, 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=buf->data;

    /* If any structs to parse go through in sequence */

    if (sk_OPENSSL_STRING_num(osk))
        {
        tmpbuf=(unsigned char *)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_NULL))
                {
                BIO_printf(bio_err, "Can't parse %s type\n",
                    typ == V_ASN1_NULL ? "NULL" : "OBJECT");
                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=(char *)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 &&
        !ASN1_parse_dump(out,(unsigned char *)&(str[offset]),length,
            indent,dump))
        {
        ERR_print_errors(bio_err);
        goto end;
        }
    ret=0;
end:
    BIO_free(derout);
    if (in != NULL) BIO_free(in);
    if (out != NULL) BIO_free_all(out);
    if (b64 != NULL) BIO_free(b64);
    if (ret != 0)
        ERR_print_errors(bio_err);
    if (buf != NULL) BUF_MEM_free(buf);
    if (at != NULL) ASN1_TYPE_free(at);
    if (osk != NULL) sk_OPENSSL_STRING_free(osk);
    OBJ_cleanup();
    apps_shutdown();
    OPENSSL_EXIT(ret);
    }

static int do_generate(BIO *bio, char *genstr, char *genconf, BUF_MEM *buf)
    {
    CONF *cnf = NULL;
    int len;
    long errline;
    unsigned char *p;
    ASN1_TYPE *atyp = NULL;

    if (genconf)
        {
        cnf = NCONF_new(NULL);
        if (!NCONF_load(cnf, genconf, &errline))
            goto conferr;
        if (!genstr)
            genstr = NCONF_get_string(cnf, "default", "asn1");
        if (!genstr)
            {
            BIO_printf(bio, "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;

    conferr:

    if (errline > 0)
        BIO_printf(bio, "Error on line %ld of config file '%s'\n",
                            errline, genconf);
    else
        BIO_printf(bio, "Error loading config file '%s'\n", genconf);

    err:
    NCONF_free(cnf);
    ASN1_TYPE_free(atyp);

    return -1;

    }