/* $OpenBSD: asn1_par.c,v 1.35 2023/07/05 21:23:36 beck Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * 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 (tjh@cryptsoft.com).
 *
 * 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 (eay@cryptsoft.com)"
 *    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 (tjh@cryptsoft.com)"
 *
 * 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.]
 */

#include <stdio.h>

#include <openssl/asn1.h>
#include <openssl/buffer.h>
#include <openssl/objects.h>

static int asn1_print_info(BIO *bp, int tag, int xclass, int constructed,
    int indent);
static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
    int offset, int depth, int indent, int dump);

static int
asn1_print_info(BIO *bp, int tag, int xclass, int constructed,
    int indent)
{
        char str[128];
        const char *p;

        if (constructed & V_ASN1_CONSTRUCTED)
                p="cons: ";
        else
                p="prim: ";
        if (BIO_write(bp, p, 6) < 6)
                goto err;
        if (!BIO_indent(bp, indent, 128))
                goto err;

        p = str;
        if ((xclass & V_ASN1_PRIVATE) == V_ASN1_PRIVATE)
                snprintf(str, sizeof str, "priv [ %d ] ", tag);
        else if ((xclass & V_ASN1_CONTEXT_SPECIFIC) == V_ASN1_CONTEXT_SPECIFIC)
                snprintf(str, sizeof str, "cont [ %d ]", tag);
        else if ((xclass & V_ASN1_APPLICATION) == V_ASN1_APPLICATION)
                snprintf(str, sizeof str, "appl [ %d ]", tag);
        else if (tag > 30)
                snprintf(str, sizeof str, "<ASN1 %d>", tag);
        else
                p = ASN1_tag2str(tag);

        if (BIO_printf(bp, "%-18s", p) <= 0)
                goto err;
        return (1);
 err:
        return (0);
}

int
ASN1_parse(BIO *bp, const unsigned char *pp, long len, int indent)
{
        return (asn1_parse2(bp, &pp, len, 0, 0, indent, 0));
}
LCRYPTO_ALIAS(ASN1_parse);

int
ASN1_parse_dump(BIO *bp, const unsigned char *pp, long len, int indent, int dump)
{
        return (asn1_parse2(bp, &pp, len, 0, 0, indent, dump));
}
LCRYPTO_ALIAS(ASN1_parse_dump);

static int
asn1_parse2(BIO *bp, const unsigned char **pp, long length, int offset,
    int depth, int indent, int dump)
{
        const unsigned char *p, *ep, *tot, *op, *opp;
        long len;
        int tag, xclass, ret = 0;
        int nl, hl, j, r;
        ASN1_OBJECT *o = NULL;
        ASN1_OCTET_STRING *os = NULL;
        ASN1_INTEGER *ai = NULL;
        ASN1_ENUMERATED *ae = NULL;
        /* ASN1_BMPSTRING *bmp=NULL;*/
        int dump_indent;

        dump_indent = 6;        /* Because we know BIO_dump_indent() */
        p = *pp;
        tot = p + length;
        op = p - 1;
        if (depth > 128) {
                BIO_printf(bp, "Max depth exceeded\n");
                goto end;
        }
        while ((p < tot) && (op < p)) {
                op = p;
                j = ASN1_get_object(&p, &len, &tag, &xclass, length);

                if (j & 0x80) {
                        if (BIO_write(bp, "Error in encoding\n", 18) <= 0)
                                goto end;
                        ret = 0;
                        goto end;
                }
                hl = (p - op);
                length -= hl;
                /* if j == 0x21 it is a constructed indefinite length object */
                if (BIO_printf(bp, "%5ld:", (long)offset +
                    (long)(op - *pp)) <= 0)
                    goto end;

                if (j != (V_ASN1_CONSTRUCTED | 1)) {
                        if (BIO_printf(bp, "d=%-2d hl=%ld l=%4ld ",
                            depth, (long)hl, len) <= 0)
                                goto end;
                } else {
                        if (BIO_printf(bp, "d=%-2d hl=%ld l=inf  ",
                            depth, (long)hl) <= 0)
                                goto end;
                }
                if (!asn1_print_info(bp, tag, xclass, j, (indent) ? depth : 0))
                        goto end;
                if (j & V_ASN1_CONSTRUCTED) {
                        ep = p + len;
                        if (BIO_write(bp, "\n", 1) <= 0)
                                goto end;
                        if (len > length) {
                                BIO_printf(bp, "length is greater than %ld\n",
                                    length);
                                ret = 0;
                                goto end;
                        }
                        if ((j == 0x21) && (len == 0)) {
                                for (;;) {
                                        r = asn1_parse2(bp, &p, (long)(tot - p),
                                            offset + (p - *pp), depth + 1,
                                            indent, dump);
                                        if (r == 0) {
                                                ret = 0;
                                                goto end;
                                        }
                                        if ((r == 2) || (p >= tot)) {
                                                len = (long)(p - ep);
                                                break;
                                        }
                                }
                        } else {
                                while (p < ep) {
                                        r = asn1_parse2(bp, &p, (long)(ep - p),
                                            offset + (p - *pp), depth + 1,
                                            indent, dump);
                                        if (r == 0) {
                                                ret = 0;
                                                goto end;
                                        }
                                }
                        }
                } else if (xclass != 0) {
                        p += len;
                        if (BIO_write(bp, "\n", 1) <= 0)
                                goto end;
                } else {
                        nl = 0;
                        if ((tag == V_ASN1_PRINTABLESTRING) ||
                            (tag == V_ASN1_T61STRING) ||
                            (tag == V_ASN1_IA5STRING) ||
                            (tag == V_ASN1_VISIBLESTRING) ||
                            (tag == V_ASN1_NUMERICSTRING) ||
                            (tag == V_ASN1_UTF8STRING) ||
                            (tag == V_ASN1_UTCTIME) ||
                            (tag == V_ASN1_GENERALIZEDTIME)) {
                                if (BIO_write(bp, ":", 1) <= 0)
                                        goto end;
                                if ((len > 0) &&
                                    BIO_write(bp, (const char *)p, (int)len) !=
                                    (int)len)
                                        goto end;
                        } else if (tag == V_ASN1_OBJECT) {
                                opp = op;
                                if (d2i_ASN1_OBJECT(&o, &opp, len + hl) !=
                                    NULL) {
                                        if (BIO_write(bp, ":", 1) <= 0)
                                                goto end;
                                        i2a_ASN1_OBJECT(bp, o);
                                } else {
                                        if (BIO_write(bp, ":BAD OBJECT",
                                            11) <= 0)
                                                goto end;
                                }
                        } else if (tag == V_ASN1_BOOLEAN) {
                                if (len == 1 && p < tot) {
                                        BIO_printf(bp, ":%u", p[0]);
                                } else {
                                        if (BIO_write(bp, "Bad boolean\n",
                                            12) <= 0)
                                                goto end;
                                }
                        } else if (tag == V_ASN1_BMPSTRING) {
                                /* do the BMP thang */
                        } else if (tag == V_ASN1_OCTET_STRING) {
                                int i, printable = 1;

                                opp = op;
                                os = d2i_ASN1_OCTET_STRING(NULL, &opp, len + hl);
                                if (os != NULL && os->length > 0) {
                                        opp = os->data;
                                        /* testing whether the octet string is
                                         * printable */
                                        for (i = 0; i < os->length; i++) {
                                                if (((opp[i] < ' ') &&
                                                    (opp[i] != '\n') &&
                                                    (opp[i] != '\r') &&
                                                    (opp[i] != '\t')) ||
                                                    (opp[i] > '~')) {
                                                        printable = 0;
                                                        break;
                                                }
                                        }
                                        if (printable) {
                                                /* printable string */
                                                if (BIO_write(bp, ":", 1) <= 0)
                                                        goto end;
                                                if (BIO_write(bp, (const char *)opp,
                                                            os->length) <= 0)
                                                        goto end;
                                        } else if (!dump) {
                                                /* not printable => print octet string
                                                 * as hex dump */
                                                if (BIO_write(bp, "[HEX DUMP]:", 11) <= 0)
                                                        goto end;
                                                for (i = 0; i < os->length; i++) {
                                                        if (BIO_printf(bp,
                                                            "%02X", opp[i]) <= 0)
                                                                goto end;
                                                }
                                        } else {
                                                /* print the normal dump */
                                                if (!nl) {
                                                        if (BIO_write(bp, "\n", 1) <= 0)
                                                                goto end;
                                                }
                                                if (BIO_dump_indent(bp,
                                                    (const char *)opp,
                                                    ((dump == -1 || dump >
                                                    os->length) ? os->length : dump),
                                                    dump_indent) <= 0)
                                                        goto end;
                                                nl = 1;
                                        }
                                }
                                ASN1_OCTET_STRING_free(os);
                                os = NULL;
                        } else if (tag == V_ASN1_INTEGER) {
                                int i;

                                opp = op;
                                ai = d2i_ASN1_INTEGER(NULL, &opp, len + hl);
                                if (ai != NULL) {
                                        if (BIO_write(bp, ":", 1) <= 0)
                                                goto end;
                                        if (ai->type == V_ASN1_NEG_INTEGER)
                                                if (BIO_write(bp, "-", 1) <= 0)
                                                        goto end;
                                        for (i = 0; i < ai->length; i++) {
                                                if (BIO_printf(bp, "%02X",
                                                    ai->data[i]) <= 0)
                                                        goto end;
                                        }
                                        if (ai->length == 0) {
                                                if (BIO_write(bp, "00", 2) <= 0)
                                                        goto end;
                                        }
                                } else {
                                        if (BIO_write(bp, "BAD INTEGER", 11) <= 0)
                                                goto end;
                                }
                                ASN1_INTEGER_free(ai);
                                ai = NULL;
                        } else if (tag == V_ASN1_ENUMERATED) {
                                int i;

                                opp = op;
                                ae = d2i_ASN1_ENUMERATED(NULL, &opp, len + hl);
                                if (ae != NULL) {
                                        if (BIO_write(bp, ":", 1) <= 0)
                                                goto end;
                                        if (ae->type == V_ASN1_NEG_ENUMERATED)
                                                if (BIO_write(bp, "-", 1) <= 0)
                                                        goto end;
                                        for (i = 0; i < ae->length; i++) {
                                                if (BIO_printf(bp, "%02X",
                                                    ae->data[i]) <= 0)
                                                        goto end;
                                        }
                                        if (ae->length == 0) {
                                                if (BIO_write(bp, "00", 2) <= 0)
                                                        goto end;
                                        }
                                } else {
                                        if (BIO_write(bp, "BAD ENUMERATED", 14) <= 0)
                                                goto end;
                                }
                                ASN1_ENUMERATED_free(ae);
                                ae = NULL;
                        } else if (len > 0 && dump) {
                                if (!nl) {
                                        if (BIO_write(bp, "\n", 1) <= 0)
                                                goto end;
                                }
                                if (BIO_dump_indent(bp, (const char *)p,
                                    ((dump == -1 || dump > len) ? len : dump),
                                    dump_indent) <= 0)
                                        goto end;
                                nl = 1;
                        }

                        if (!nl) {
                                if (BIO_write(bp, "\n", 1) <= 0)
                                        goto end;
                        }
                        p += len;
                        if ((tag == V_ASN1_EOC) && (xclass == 0)) {
                                ret = 2; /* End of sequence */
                                goto end;
                        }
                }
                length -= len;
        }
        ret = 1;

 end:
        if (o != NULL)
                ASN1_OBJECT_free(o);
        ASN1_OCTET_STRING_free(os);
        ASN1_INTEGER_free(ai);
        ASN1_ENUMERATED_free(ae);
        *pp = p;
        return (ret);
}