/*

 * Copyright 1995-2024 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 <limits.h>

#include "crypto/ctype.h"

#include "internal/cryptlib.h"

#include <openssl/buffer.h>

#include <openssl/asn1.h>

#include <openssl/objects.h>

#include <openssl/bn.h>

#include "crypto/asn1.h"

#include "asn1_local.h"

int i2d_ASN1_OBJECT(const ASN1_OBJECT *a, unsigned char **pp)

{

    unsigned char *p, *allocated = NULL;

    int objsize;

    if ((a == NULL) || (a->data == NULL))

        return 0;

    objsize = ASN1_object_size(0, a->length, V_ASN1_OBJECT);

    if (pp == NULL || objsize == -1)

        return objsize;

    if (*pp == NULL) {

        if ((p = allocated = OPENSSL_malloc(objsize)) == NULL)

            return 0;

    } else {

        p = *pp;

    }

    ASN1_put_object(&p, 0, a->length, V_ASN1_OBJECT, V_ASN1_UNIVERSAL);

    memcpy(p, a->data, a->length);

    /*

     * If a new buffer was allocated, just return it back.

     * If not, return the incremented buffer pointer.

     */

    *pp = allocated != NULL ? allocated : p + a->length;

    return objsize;

}

int a2d_ASN1_OBJECT(unsigned char *out, int olen, const char *buf, int num)

{

    int i, first, len = 0, c, use_bn;

    char ftmp[24], *tmp = ftmp;

    int tmpsize = sizeof(ftmp);

    const char *p;

    unsigned long l;

    BIGNUM *bl = NULL;

    if (num == 0)

        return 0;

    else if (num == -1)

        num = strlen(buf);

    p = buf;

    c = *(p++);

    num--;

    if ((c >= '0') && (c <= '2')) {

        first = c - '0';

    } else {

        ERR_raise(ERR_LIB_ASN1, ASN1_R_FIRST_NUM_TOO_LARGE);

        goto err;

    }

    if (num <= 0) {

        ERR_raise(ERR_LIB_ASN1, ASN1_R_MISSING_SECOND_NUMBER);

        goto err;

    }

    c = *(p++);

    num--;

    for (;;) {

        if (num <= 0)

            break;

        if ((c != '.') && (c != ' ')) {

            ERR_raise(ERR_LIB_ASN1, ASN1_R_INVALID_SEPARATOR);

            goto err;

        }

        l = 0;

        use_bn = 0;

        for (;;) {

            if (num <= 0)

                break;

            num--;

            c = *(p++);

            if ((c == ' ') || (c == '.'))

                break;

            if (!ossl_isdigit(c)) {

                ERR_raise(ERR_LIB_ASN1, ASN1_R_INVALID_DIGIT);

                goto err;

            }

            if (!use_bn && l >= ((ULONG_MAX - 80) / 10L)) {

                use_bn = 1;

                if (bl == NULL)

                    bl = BN_new();

                if (bl == NULL || !BN_set_word(bl, l))

                    goto err;

            }

            if (use_bn) {

                if (!BN_mul_word(bl, 10L)

                    || !BN_add_word(bl, c - '0'))

                    goto err;

            } else

                l = l * 10L + (long)(c - '0');

        }

        if (len == 0) {

            if ((first < 2) && (l >= 40)) {

                ERR_raise(ERR_LIB_ASN1, ASN1_R_SECOND_NUMBER_TOO_LARGE);

                goto err;

            }

            if (use_bn) {

                if (!BN_add_word(bl, first * 40))

                    goto err;

            } else

                l += (long)first *40;

        }

        i = 0;

        if (use_bn) {

            int blsize;

            blsize = BN_num_bits(bl);

            blsize = (blsize + 6) / 7;

            if (blsize > tmpsize) {

                if (tmp != ftmp)

                    OPENSSL_free(tmp);

                tmpsize = blsize + 32;

                tmp = OPENSSL_malloc(tmpsize);

                if (tmp == NULL)

                    goto err;

            }

            while (blsize--) {

                BN_ULONG t = BN_div_word(bl, 0x80L);

                if (t == (BN_ULONG)-1)

                    goto err;

                tmp[i++] = (unsigned char)t;

            }

        } else {

            for (;;) {

                tmp[i++] = (unsigned char)l & 0x7f;

                l >>= 7L;

                if (l == 0L)

                    break;

            }

        }

        if (out != NULL) {

            if (len + i > olen) {

                ERR_raise(ERR_LIB_ASN1, ASN1_R_BUFFER_TOO_SMALL);

                goto err;

            }

            while (--i > 0)

                out[len++] = tmp[i] | 0x80;

            out[len++] = tmp[0];

        } else

            len += i;

    }

    if (tmp != ftmp)

        OPENSSL_free(tmp);

    BN_free(bl);

    return len;

 err:

    if (tmp != ftmp)

        OPENSSL_free(tmp);

    BN_free(bl);

    return 0;

}

int i2t_ASN1_OBJECT(char *buf, int buf_len, const ASN1_OBJECT *a)

{

    return OBJ_obj2txt(buf, buf_len, a, 0);

}

int i2a_ASN1_OBJECT(BIO *bp, const ASN1_OBJECT *a)

{

    char buf[80], *p = buf;

    int i;

    if ((a == NULL) || (a->data == NULL))

        return BIO_write(bp, "NULL", 4);

    i = i2t_ASN1_OBJECT(buf, sizeof(buf), a);

    if (i > (int)(sizeof(buf) - 1)) {

        if (i > INT_MAX - 1) {  /* catch an integer overflow */

            ERR_raise(ERR_LIB_ASN1, ASN1_R_LENGTH_TOO_LONG);

            return -1;

        }

        if ((p = OPENSSL_malloc(i + 1)) == NULL)

            return -1;

        i2t_ASN1_OBJECT(p, i + 1, a);

    }

    if (i <= 0) {

        i = BIO_write(bp, "<INVALID>", 9);

        if (i > 0)

            i += BIO_dump(bp, (const char *)a->data, a->length);

        return i;

    }

    BIO_write(bp, p, i);

    if (p != buf)

        OPENSSL_free(p);

    return i;

}

ASN1_OBJECT *d2i_ASN1_OBJECT(ASN1_OBJECT **a, const unsigned char **pp,

                             long length)

{

    const unsigned char *p;

    long len;

    int tag, xclass;

    int inf, i;

    ASN1_OBJECT *ret = NULL;

    p = *pp;

    inf = ASN1_get_object(&p, &len, &tag, &xclass, length);

    if (inf & 0x80) {

        i = ASN1_R_BAD_OBJECT_HEADER;

        goto err;

    }

    if (tag != V_ASN1_OBJECT) {

        i = ASN1_R_EXPECTING_AN_OBJECT;

        goto err;

    }

    ret = ossl_c2i_ASN1_OBJECT(a, &p, len);

    if (ret)

        *pp = p;

    return ret;

 err:

    ERR_raise(ERR_LIB_ASN1, i);

    return NULL;

}

ASN1_OBJECT *ossl_c2i_ASN1_OBJECT(ASN1_OBJECT **a, const unsigned char **pp,

                                  long len)

{

    ASN1_OBJECT *ret = NULL, tobj;

    const unsigned char *p;

    unsigned char *data;

    int i, length;

    /*

     * Sanity check OID encoding. Need at least one content octet. MSB must

     * be clear in the last octet. can't have leading 0x80 in subidentifiers,

     * see: X.690 8.19.2

     */

    if (len <= 0 || len > INT_MAX || pp == NULL || (p = *pp) == NULL ||

        p[len - 1] & 0x80) {

        ERR_raise(ERR_LIB_ASN1, ASN1_R_INVALID_OBJECT_ENCODING);

        return NULL;

    }

    /* Now 0 < len <= INT_MAX, so the cast is safe. */

    length = (int)len;

    /*

     * Try to lookup OID in table: these are all valid encodings so if we get

     * a match we know the OID is valid.

     */

    tobj.nid = NID_undef;

    tobj.data = p;

    tobj.length = length;

    tobj.flags = 0;

    i = OBJ_obj2nid(&tobj);

    if (i != NID_undef) {

        /*

         * Return shared registered OID object: this improves efficiency

         * because we don't have to return a dynamically allocated OID

         * and NID lookups can use the cached value.

         */

        ret = OBJ_nid2obj(i);

        if (a) {

            ASN1_OBJECT_free(*a);

            *a = ret;

        }

        *pp += len;

        return ret;

    }

    for (i = 0; i < length; i++, p++) {

        if (*p == 0x80 && (!i || !(p[-1] & 0x80))) {

            ERR_raise(ERR_LIB_ASN1, ASN1_R_INVALID_OBJECT_ENCODING);

            return NULL;

        }

    }

    if ((a == NULL) || ((*a) == NULL) ||

        !((*a)->flags & ASN1_OBJECT_FLAG_DYNAMIC)) {

        if ((ret = ASN1_OBJECT_new()) == NULL)

            return NULL;

    } else {

        ret = (*a);

    }

    p = *pp;

    /* detach data from object */

    data = (unsigned char *)ret->data;

    ret->data = NULL;

    /* once detached we can change it */

    if ((data == NULL) || (ret->length < length)) {

        ret->length = 0;

        OPENSSL_free(data);

        data = OPENSSL_malloc(length);

        if (data == NULL)

            goto err;

        ret->flags |= ASN1_OBJECT_FLAG_DYNAMIC_DATA;

    }

    memcpy(data, p, length);

    /* If there are dynamic strings, free them here, and clear the flag */

    if ((ret->flags & ASN1_OBJECT_FLAG_DYNAMIC_STRINGS) != 0) {

        OPENSSL_free((char *)ret->sn);

        OPENSSL_free((char *)ret->ln);

        ret->flags &= ~ASN1_OBJECT_FLAG_DYNAMIC_STRINGS;

    }

    /* reattach data to object, after which it remains const */

    ret->data = data;

    ret->length = length;

    ret->sn = NULL;

    ret->ln = NULL;

    /* ret->flags=ASN1_OBJECT_FLAG_DYNAMIC; we know it is dynamic */

    p += length;

    if (a != NULL)

        (*a) = ret;

    *pp = p;

    return ret;

 err:

    ERR_raise(ERR_LIB_ASN1, i);

    if ((a == NULL) || (*a != ret))

        ASN1_OBJECT_free(ret);

    return NULL;

}

ASN1_OBJECT *ASN1_OBJECT_new(void)

{

    ASN1_OBJECT *ret;

    ret = OPENSSL_zalloc(sizeof(*ret));

    if (ret == NULL)

        return NULL;

    ret->flags = ASN1_OBJECT_FLAG_DYNAMIC;

    return ret;

}

void ASN1_OBJECT_free(ASN1_OBJECT *a)

{

    if (a == NULL)

        return;

    if (a->flags & ASN1_OBJECT_FLAG_DYNAMIC_STRINGS) {

#ifndef CONST_STRICT

        /*

         * Disable purely for compile-time strict const checking.  Doing this

         * on a "real" compile will cause memory leaks

         */

        OPENSSL_free((void*)a->sn);

        OPENSSL_free((void*)a->ln);

#endif

        a->sn = a->ln = NULL;

    }

    if (a->flags & ASN1_OBJECT_FLAG_DYNAMIC_DATA) {

        OPENSSL_free((void*)a->data);

        a->data = NULL;

        a->length = 0;

    }

    if (a->flags & ASN1_OBJECT_FLAG_DYNAMIC)

        OPENSSL_free(a);

}

ASN1_OBJECT *ASN1_OBJECT_create(int nid, unsigned char *data, int len,

                                const char *sn, const char *ln)

{

    ASN1_OBJECT o;

    o.sn = sn;

    o.ln = ln;

    o.data = data;

    o.nid = nid;

    o.length = len;

    o.flags = ASN1_OBJECT_FLAG_DYNAMIC | ASN1_OBJECT_FLAG_DYNAMIC_STRINGS |

        ASN1_OBJECT_FLAG_DYNAMIC_DATA;

    return OBJ_dup(&o);

}