/*

 * Copyright 1999-2026 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (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

 */

/* X509 v3 extension utilities */

#include <stdio.h>

#include "internal/cryptlib.h"

#include <openssl/conf.h>

#include <openssl/x509v3.h>

/* Extension printing routines */

static int unknown_ext_print(BIO *out, const unsigned char *ext, int extlen,

    unsigned long flag, int indent, int supported);

/* Print out a name+value stack */

void X509V3_EXT_val_prn(BIO *out, STACK_OF(CONF_VALUE) *val, int indent,

    int ml)

{

    int i;

    CONF_VALUE *nval;

    if (!val)

        return;

    if (!ml || !sk_CONF_VALUE_num(val)) {

        BIO_printf(out, "%*s", indent, "");

        if (!sk_CONF_VALUE_num(val))

            BIO_puts(out, "<EMPTY>\n");

    }

    for (i = 0; i < sk_CONF_VALUE_num(val); i++) {

        if (ml) {

            if (i > 0)

                BIO_printf(out, "\n");

            BIO_printf(out, "%*s", indent, "");

        } else if (i > 0)

            BIO_printf(out, ", ");

        nval = sk_CONF_VALUE_value(val, i);

        if (!nval->name)

            BIO_puts(out, nval->value);

        else if (!nval->value)

            BIO_puts(out, nval->name);

#ifndef CHARSET_EBCDIC

        else

            BIO_printf(out, "%s:%s", nval->name, nval->value);

#else

        else {

            int len;

            char *tmp;

            len = strlen(nval->value) + 1;

            tmp = OPENSSL_malloc(len);

            if (tmp != NULL) {

                ascii2ebcdic(tmp, nval->value, len);

                BIO_printf(out, "%s:%s", nval->name, tmp);

                OPENSSL_free(tmp);

            }

        }

#endif

    }

}

/* Main routine: print out a general extension */

int X509V3_EXT_print(BIO *out, const X509_EXTENSION *ext, unsigned long flag,

    int indent)

{

    void *ext_str = NULL;

    char *value = NULL;

    const ASN1_OCTET_STRING *extoct;

    const unsigned char *p;

    size_t extlen;

    const X509V3_EXT_METHOD *method;

    STACK_OF(CONF_VALUE) *nval = NULL;

    int ok = 1;

    extoct = X509_EXTENSION_get_data(ext);

    p = ASN1_STRING_get0_data(extoct);

    extlen = ASN1_STRING_get_length(extoct);

    if (extlen > INT_MAX)

        return 0;

    if ((method = X509V3_EXT_get(ext)) == NULL)

        return unknown_ext_print(out, p, (int)extlen, flag, indent, 0);

    if (method->it)

        ext_str = ASN1_item_d2i(NULL, &p, (int)extlen, ASN1_ITEM_ptr(method->it));

    else

        ext_str = method->d2i(NULL, &p, (int)extlen);

    if (!ext_str)

        return unknown_ext_print(out, p, (int)extlen, flag, indent, 1);

    if (method->i2s) {

        if ((value = method->i2s(method, ext_str)) == NULL) {

            ok = 0;

            goto err;

        }

#ifndef CHARSET_EBCDIC

        BIO_printf(out, "%*s%s", indent, "", value);

#else

        {

            int len;

            char *tmp;

            len = strlen(value) + 1;

            tmp = OPENSSL_malloc(len);

            if (tmp != NULL) {

                ascii2ebcdic(tmp, value, len);

                BIO_printf(out, "%*s%s", indent, "", tmp);

                OPENSSL_free(tmp);

            }

        }

#endif

    } else if (method->i2v) {

        if ((nval = method->i2v(method, ext_str, NULL)) == NULL) {

            ok = 0;

            goto err;

        }

        X509V3_EXT_val_prn(out, nval, indent,

            method->ext_flags & X509V3_EXT_MULTILINE);

    } else if (method->i2r) {

        if (!method->i2r(method, ext_str, out, indent))

            ok = 0;

    } else

        ok = 0;

err:

    sk_CONF_VALUE_pop_free(nval, X509V3_conf_free);

    OPENSSL_free(value);

    if (method->it)

        ASN1_item_free(ext_str, ASN1_ITEM_ptr(method->it));

    else

        method->ext_free(ext_str);

    return ok;

}

int X509V3_extensions_print(BIO *bp, const char *title,

    const STACK_OF(X509_EXTENSION) *exts,

    unsigned long flag, int indent)

{

    int i, j;

    if (sk_X509_EXTENSION_num(exts) <= 0)

        return 1;

    if (title) {

        BIO_printf(bp, "%*s%s:\n", indent, "", title);

        indent += 4;

    }

    for (i = 0; i < sk_X509_EXTENSION_num(exts); i++) {

        const ASN1_OBJECT *obj;

        const X509_EXTENSION *ex;

        ex = sk_X509_EXTENSION_value(exts, i);

        obj = X509_EXTENSION_get_object(ex);

        if ((flag & X509_FLAG_EXTENSIONS_ONLY_KID) != 0

            && OBJ_obj2nid(obj) != NID_subject_key_identifier

            && OBJ_obj2nid(obj) != NID_authority_key_identifier)

            continue;

        if (indent && BIO_printf(bp, "%*s", indent, "") <= 0)

            return 0;

        i2a_ASN1_OBJECT(bp, obj);

        j = X509_EXTENSION_get_critical(ex);

        if (BIO_printf(bp, ": %s\n", j ? "critical" : "") <= 0)

            return 0;

        if (!X509V3_EXT_print(bp, ex, flag, indent + 4)) {

            BIO_printf(bp, "%*s", indent + 4, "");

            ASN1_STRING_print(bp, X509_EXTENSION_get_data(ex));

        }

        if (BIO_write(bp, "\n", 1) <= 0)

            return 0;

    }

    return 1;

}

static int unknown_ext_print(BIO *out, const unsigned char *ext, int extlen,

    unsigned long flag, int indent, int supported)

{

    switch (flag & X509V3_EXT_UNKNOWN_MASK) {

    case X509V3_EXT_DEFAULT:

        return 0;

    case X509V3_EXT_ERROR_UNKNOWN:

        if (supported)

            BIO_printf(out, "%*s<Parse Error>", indent, "");

        else

            BIO_printf(out, "%*s<Not Supported>", indent, "");

        return 1;

    case X509V3_EXT_PARSE_UNKNOWN:

        return ASN1_parse_dump(out, ext, extlen, indent, -1) > 0;

    case X509V3_EXT_DUMP_UNKNOWN:

        return BIO_dump_indent(out, (const char *)ext, extlen, indent) > 0;

    default:

        return 1;

    }

}

#ifndef OPENSSL_NO_STDIO

int X509V3_EXT_print_fp(FILE *fp, const X509_EXTENSION *ext, int flag, int indent)

{

    BIO *bio_tmp;

    int ret;

    if ((bio_tmp = BIO_new_fp(fp, BIO_NOCLOSE)) == NULL)

        return 0;

    ret = X509V3_EXT_print(bio_tmp, ext, flag, indent);

    BIO_free(bio_tmp);

    return ret;

}

#endif