/*

 * Copyright 1999-2025 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

 */

#include <stdio.h>

#include "internal/cryptlib.h"

#include <openssl/asn1.h>

#include <openssl/objects.h>

static STACK_OF(ASN1_STRING_TABLE) *stable = NULL;

static void st_free(ASN1_STRING_TABLE *tbl);

static int sk_table_cmp(const ASN1_STRING_TABLE *const *a,

                        const ASN1_STRING_TABLE *const *b);

/*

 * This is the global mask for the mbstring functions: this is use to mask

 * out certain types (such as BMPString and UTF8String) because certain

 * software (e.g. Netscape) has problems with them.

 */

static unsigned long global_mask = B_ASN1_UTF8STRING;

void ASN1_STRING_set_default_mask(unsigned long mask)

{

    global_mask = mask;

}

unsigned long ASN1_STRING_get_default_mask(void)

{

    return global_mask;

}

/*-

 * This function sets the default to various "flavours" of configuration.

 * based on an ASCII string. Currently this is:

 * MASK:XXXX : a numerical mask value.

 * default   : use Printable, IA5, T61, BMP, and UTF8 string types

 * nombstr   : any string type except variable-sized BMPStrings or UTF8Strings

 * pkix      : PKIX recommendation in RFC 5280

 * utf8only  : this is the default, use UTF8Strings

 */

int ASN1_STRING_set_default_mask_asc(const char *p)

{

    unsigned long mask;

    char *end;

    if (CHECK_AND_SKIP_PREFIX(p, "MASK:")) {

        if (*p == '\0')

            return 0;

        mask = strtoul(p, &end, 0);

        if (*end)

            return 0;

    } else if (strcmp(p, "nombstr") == 0)

        mask = ~((unsigned long)(B_ASN1_BMPSTRING | B_ASN1_UTF8STRING));

    else if (strcmp(p, "pkix") == 0)

        mask = ~((unsigned long)B_ASN1_T61STRING);

    else if (strcmp(p, "utf8only") == 0)

        mask = B_ASN1_UTF8STRING;

    else if (strcmp(p, "default") == 0)

        mask = 0xFFFFFFFFL;

    else

        return 0;

    ASN1_STRING_set_default_mask(mask);

    return 1;

}

/*

 * The following function generates an ASN1_STRING based on limits in a

 * table. Frequently the types and length of an ASN1_STRING are restricted by

 * a corresponding OID. For example certificates and certificate requests.

 */

ASN1_STRING *ASN1_STRING_set_by_NID(ASN1_STRING **out,

                                    const unsigned char *in, int inlen,

                                    int inform, int nid)

{

    ASN1_STRING_TABLE *tbl;

    ASN1_STRING *str = NULL;

    unsigned long mask;

    int ret;

    if (out == NULL)

        out = &str;

    tbl = ASN1_STRING_TABLE_get(nid);

    if (tbl != NULL) {

        mask = tbl->mask;

        if (!(tbl->flags & STABLE_NO_MASK))

            mask &= global_mask;

        ret = ASN1_mbstring_ncopy(out, in, inlen, inform, mask,

                                  tbl->minsize, tbl->maxsize);

    } else {

        ret = ASN1_mbstring_copy(out, in, inlen, inform,

                                 DIRSTRING_TYPE & global_mask);

    }

    if (ret <= 0)

        return NULL;

    return *out;

}

/*

 * Now the tables and helper functions for the string table:

 */

#include "tbl_standard.h"

static int sk_table_cmp(const ASN1_STRING_TABLE *const *a,

                        const ASN1_STRING_TABLE *const *b)

{

    return (*a)->nid - (*b)->nid;

}

DECLARE_OBJ_BSEARCH_CMP_FN(ASN1_STRING_TABLE, ASN1_STRING_TABLE, table);

static int table_cmp(const ASN1_STRING_TABLE *a, const ASN1_STRING_TABLE *b)

{

    return a->nid - b->nid;

}

IMPLEMENT_OBJ_BSEARCH_CMP_FN(ASN1_STRING_TABLE, ASN1_STRING_TABLE, table);

ASN1_STRING_TABLE *ASN1_STRING_TABLE_get(int nid)

{

    int idx;

    ASN1_STRING_TABLE fnd;

#ifndef OPENSSL_NO_AUTOLOAD_CONFIG

    /* "stable" can be impacted by config, so load the config file first */

    OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CONFIG, NULL);

#endif

    fnd.nid = nid;

    if (stable != NULL) {

        /* Ideally, this would be done under lock */

        sk_ASN1_STRING_TABLE_sort(stable);

        idx = sk_ASN1_STRING_TABLE_find(stable, &fnd);

        if (idx >= 0)

            return sk_ASN1_STRING_TABLE_value(stable, idx);

    }

    return OBJ_bsearch_table(&fnd, tbl_standard, OSSL_NELEM(tbl_standard));

}

/*

 * Return a string table pointer which can be modified: either directly from

 * table or a copy of an internal value added to the table.

 */

static ASN1_STRING_TABLE *stable_get(int nid)

{

    ASN1_STRING_TABLE *tmp, *rv;

    /* Always need a string table so allocate one if NULL */

    if (stable == NULL) {

        stable = sk_ASN1_STRING_TABLE_new(sk_table_cmp);

        if (stable == NULL)

            return NULL;

    }

    tmp = ASN1_STRING_TABLE_get(nid);

    if (tmp != NULL && tmp->flags & STABLE_FLAGS_MALLOC)

        return tmp;

    if ((rv = OPENSSL_zalloc(sizeof(*rv))) == NULL)

        return NULL;

    if (!sk_ASN1_STRING_TABLE_push(stable, rv)) {

        OPENSSL_free(rv);

        return NULL;

    }

    if (tmp != NULL) {

        rv->nid = tmp->nid;

        rv->minsize = tmp->minsize;

        rv->maxsize = tmp->maxsize;

        rv->mask = tmp->mask;

        rv->flags = tmp->flags | STABLE_FLAGS_MALLOC;

    } else {

        rv->nid = nid;

        rv->minsize = -1;

        rv->maxsize = -1;

        rv->flags = STABLE_FLAGS_MALLOC;

    }

    return rv;

}

int ASN1_STRING_TABLE_add(int nid,

                          long minsize, long maxsize, unsigned long mask,

                          unsigned long flags)

{

    ASN1_STRING_TABLE *tmp;

    tmp = stable_get(nid);

    if (tmp == NULL) {

        ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);

        return 0;

    }

    if (minsize >= 0)

        tmp->minsize = minsize;

    if (maxsize >= 0)

        tmp->maxsize = maxsize;

    if (mask)

        tmp->mask = mask;

    if (flags)

        tmp->flags = STABLE_FLAGS_MALLOC | flags;

    return 1;

}

void ASN1_STRING_TABLE_cleanup(void)

{

    STACK_OF(ASN1_STRING_TABLE) *tmp;

    tmp = stable;

    if (tmp == NULL)

        return;

    stable = NULL;

    sk_ASN1_STRING_TABLE_pop_free(tmp, st_free);

}

static void st_free(ASN1_STRING_TABLE *tbl)

{

    if (tbl->flags & STABLE_FLAGS_MALLOC)

        OPENSSL_free(tbl);

}