/*

 * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (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 "crypto/ctype.h"

#include <limits.h>

#include "internal/cryptlib.h"

#include <openssl/lhash.h>

#include <openssl/asn1.h>

#include "crypto/objects.h"

#include <openssl/bn.h>

#include "crypto/asn1.h"

#include "obj_local.h"

/* obj_dat.h is generated from objects.h by obj_dat.pl */

#include "obj_dat.h"

DECLARE_OBJ_BSEARCH_CMP_FN(const ASN1_OBJECT *, unsigned int, sn);

DECLARE_OBJ_BSEARCH_CMP_FN(const ASN1_OBJECT *, unsigned int, ln);

DECLARE_OBJ_BSEARCH_CMP_FN(const ASN1_OBJECT *, unsigned int, obj);

#define ADDED_DATA      0

#define ADDED_SNAME     1

#define ADDED_LNAME     2

#define ADDED_NID       3

struct added_obj_st {

    int type;

    ASN1_OBJECT *obj;

};

static int new_nid = NUM_NID;

static LHASH_OF(ADDED_OBJ) *added = NULL;

static int sn_cmp(const ASN1_OBJECT *const *a, const unsigned int *b)

{

    return strcmp((*a)->sn, nid_objs[*b].sn);

}

IMPLEMENT_OBJ_BSEARCH_CMP_FN(const ASN1_OBJECT *, unsigned int, sn);

static int ln_cmp(const ASN1_OBJECT *const *a, const unsigned int *b)

{

    return strcmp((*a)->ln, nid_objs[*b].ln);

}

IMPLEMENT_OBJ_BSEARCH_CMP_FN(const ASN1_OBJECT *, unsigned int, ln);

static unsigned long added_obj_hash(const ADDED_OBJ *ca)

{

    const ASN1_OBJECT *a;

    int i;

    unsigned long ret = 0;

    unsigned char *p;

    a = ca->obj;

    switch (ca->type) {

    case ADDED_DATA:

        ret = a->length << 20L;

        p = (unsigned char *)a->data;

        for (i = 0; i < a->length; i++)

            ret ^= p[i] << ((i * 3) % 24);

        break;

    case ADDED_SNAME:

        ret = OPENSSL_LH_strhash(a->sn);

        break;

    case ADDED_LNAME:

        ret = OPENSSL_LH_strhash(a->ln);

        break;

    case ADDED_NID:

        ret = a->nid;

        break;

    default:

        /* abort(); */

        return 0;

    }

    ret &= 0x3fffffffL;

    ret |= ((unsigned long)ca->type) << 30L;

    return ret;

}

static int added_obj_cmp(const ADDED_OBJ *ca, const ADDED_OBJ *cb)

{

    ASN1_OBJECT *a, *b;

    int i;

    i = ca->type - cb->type;

    if (i)

        return i;

    a = ca->obj;

    b = cb->obj;

    switch (ca->type) {

    case ADDED_DATA:

        i = (a->length - b->length);

        if (i)

            return i;

        return memcmp(a->data, b->data, (size_t)a->length);

    case ADDED_SNAME:

        if (a->sn == NULL)

            return -1;

        else if (b->sn == NULL)

            return 1;

        else

            return strcmp(a->sn, b->sn);

    case ADDED_LNAME:

        if (a->ln == NULL)

            return -1;

        else if (b->ln == NULL)

            return 1;

        else

            return strcmp(a->ln, b->ln);

    case ADDED_NID:

        return a->nid - b->nid;

    default:

        /* abort(); */

        return 0;

    }

}

static int init_added(void)

{

    if (added != NULL)

        return 1;

    added = lh_ADDED_OBJ_new(added_obj_hash, added_obj_cmp);

    return added != NULL;

}

static void cleanup1_doall(ADDED_OBJ *a)

{

    a->obj->nid = 0;

    a->obj->flags |= ASN1_OBJECT_FLAG_DYNAMIC |

        ASN1_OBJECT_FLAG_DYNAMIC_STRINGS | ASN1_OBJECT_FLAG_DYNAMIC_DATA;

}

static void cleanup2_doall(ADDED_OBJ *a)

{

    a->obj->nid++;

}

static void cleanup3_doall(ADDED_OBJ *a)

{

    if (--a->obj->nid == 0)

        ASN1_OBJECT_free(a->obj);

    OPENSSL_free(a);

}

void obj_cleanup_int(void)

{

    if (added == NULL)

        return;

    lh_ADDED_OBJ_set_down_load(added, 0);

    lh_ADDED_OBJ_doall(added, cleanup1_doall); /* zero counters */

    lh_ADDED_OBJ_doall(added, cleanup2_doall); /* set counters */

    lh_ADDED_OBJ_doall(added, cleanup3_doall); /* free objects */

    lh_ADDED_OBJ_free(added);

    added = NULL;

}

int OBJ_new_nid(int num)

{

    int i;

    i = new_nid;

    new_nid += num;

    return i;

}

int OBJ_add_object(const ASN1_OBJECT *obj)

{

    ASN1_OBJECT *o;

    ADDED_OBJ *ao[4] = { NULL, NULL, NULL, NULL }, *aop;

    int i;

    if (added == NULL)

        if (!init_added())

            return 0;

    if ((o = OBJ_dup(obj)) == NULL)

        goto err;

    if ((ao[ADDED_NID] = OPENSSL_malloc(sizeof(*ao[0]))) == NULL)

        goto err2;

    if ((o->length != 0) && (obj->data != NULL))

        if ((ao[ADDED_DATA] = OPENSSL_malloc(sizeof(*ao[0]))) == NULL)

            goto err2;

    if (o->sn != NULL)

        if ((ao[ADDED_SNAME] = OPENSSL_malloc(sizeof(*ao[0]))) == NULL)

            goto err2;

    if (o->ln != NULL)

        if ((ao[ADDED_LNAME] = OPENSSL_malloc(sizeof(*ao[0]))) == NULL)

            goto err2;

    for (i = ADDED_DATA; i <= ADDED_NID; i++) {

        if (ao[i] != NULL) {

            ao[i]->type = i;

            ao[i]->obj = o;

            aop = lh_ADDED_OBJ_insert(added, ao[i]);

            /* memory leak, but should not normally matter */

            OPENSSL_free(aop);

        }

    }

    o->flags &=

        ~(ASN1_OBJECT_FLAG_DYNAMIC | ASN1_OBJECT_FLAG_DYNAMIC_STRINGS |

          ASN1_OBJECT_FLAG_DYNAMIC_DATA);

    return o->nid;

 err2:

    OBJerr(OBJ_F_OBJ_ADD_OBJECT, ERR_R_MALLOC_FAILURE);

 err:

    for (i = ADDED_DATA; i <= ADDED_NID; i++)

        OPENSSL_free(ao[i]);

    ASN1_OBJECT_free(o);

    return NID_undef;

}

ASN1_OBJECT *OBJ_nid2obj(int n)

{

    ADDED_OBJ ad, *adp;

    ASN1_OBJECT ob;

    if ((n >= 0) && (n < NUM_NID)) {

        if ((n != NID_undef) && (nid_objs[n].nid == NID_undef)) {

            OBJerr(OBJ_F_OBJ_NID2OBJ, OBJ_R_UNKNOWN_NID);

            return NULL;

        }

        return (ASN1_OBJECT *)&(nid_objs[n]);

    } else if (added == NULL) {

        OBJerr(OBJ_F_OBJ_NID2OBJ, OBJ_R_UNKNOWN_NID);

        return NULL;

    } else {

        ad.type = ADDED_NID;

        ad.obj = &ob;

        ob.nid = n;

        adp = lh_ADDED_OBJ_retrieve(added, &ad);

        if (adp != NULL)

            return adp->obj;

        else {

            OBJerr(OBJ_F_OBJ_NID2OBJ, OBJ_R_UNKNOWN_NID);

            return NULL;

        }

    }

}

const char *OBJ_nid2sn(int n)

{

    ADDED_OBJ ad, *adp;

    ASN1_OBJECT ob;

    if ((n >= 0) && (n < NUM_NID)) {

        if ((n != NID_undef) && (nid_objs[n].nid == NID_undef)) {

            OBJerr(OBJ_F_OBJ_NID2SN, OBJ_R_UNKNOWN_NID);

            return NULL;

        }

        return nid_objs[n].sn;

    } else if (added == NULL)

        return NULL;

    else {

        ad.type = ADDED_NID;

        ad.obj = &ob;

        ob.nid = n;

        adp = lh_ADDED_OBJ_retrieve(added, &ad);

        if (adp != NULL)

            return adp->obj->sn;

        else {

            OBJerr(OBJ_F_OBJ_NID2SN, OBJ_R_UNKNOWN_NID);

            return NULL;

        }

    }

}

const char *OBJ_nid2ln(int n)

{

    ADDED_OBJ ad, *adp;

    ASN1_OBJECT ob;

    if ((n >= 0) && (n < NUM_NID)) {

        if ((n != NID_undef) && (nid_objs[n].nid == NID_undef)) {

            OBJerr(OBJ_F_OBJ_NID2LN, OBJ_R_UNKNOWN_NID);

            return NULL;

        }

        return nid_objs[n].ln;

    } else if (added == NULL)

        return NULL;

    else {

        ad.type = ADDED_NID;

        ad.obj = &ob;

        ob.nid = n;

        adp = lh_ADDED_OBJ_retrieve(added, &ad);

        if (adp != NULL)

            return adp->obj->ln;

        else {

            OBJerr(OBJ_F_OBJ_NID2LN, OBJ_R_UNKNOWN_NID);

            return NULL;

        }

    }

}

static int obj_cmp(const ASN1_OBJECT *const *ap, const unsigned int *bp)

{

    int j;

    const ASN1_OBJECT *a = *ap;

    const ASN1_OBJECT *b = &nid_objs[*bp];

    j = (a->length - b->length);

    if (j)

        return j;

    if (a->length == 0)

        return 0;

    return memcmp(a->data, b->data, a->length);

}

IMPLEMENT_OBJ_BSEARCH_CMP_FN(const ASN1_OBJECT *, unsigned int, obj);

int OBJ_obj2nid(const ASN1_OBJECT *a)

{

    const unsigned int *op;

    ADDED_OBJ ad, *adp;

    if (a == NULL)

        return NID_undef;

    if (a->nid != 0)

        return a->nid;

    if (a->length == 0)

        return NID_undef;

    if (added != NULL) {

        ad.type = ADDED_DATA;

        ad.obj = (ASN1_OBJECT *)a; /* XXX: ugly but harmless */

        adp = lh_ADDED_OBJ_retrieve(added, &ad);

        if (adp != NULL)

            return adp->obj->nid;

    }

    op = OBJ_bsearch_obj(&a, obj_objs, NUM_OBJ);

    if (op == NULL)

        return NID_undef;

    return nid_objs[*op].nid;

}

/*

 * Convert an object name into an ASN1_OBJECT if "noname" is not set then

 * search for short and long names first. This will convert the "dotted" form

 * into an object: unlike OBJ_txt2nid it can be used with any objects, not

 * just registered ones.

 */

ASN1_OBJECT *OBJ_txt2obj(const char *s, int no_name)

{

    int nid = NID_undef;

    ASN1_OBJECT *op;

    unsigned char *buf;

    unsigned char *p;

    const unsigned char *cp;

    int i, j;

    if (!no_name) {

        if (((nid = OBJ_sn2nid(s)) != NID_undef) ||

            ((nid = OBJ_ln2nid(s)) != NID_undef))

            return OBJ_nid2obj(nid);

    }

    /* Work out size of content octets */

    i = a2d_ASN1_OBJECT(NULL, 0, s, -1);

    if (i <= 0) {

        /* Don't clear the error */

        /*

         * ERR_clear_error();

         */

        return NULL;

    }

    /* Work out total size */

    j = ASN1_object_size(0, i, V_ASN1_OBJECT);

    if (j < 0)

        return NULL;

    if ((buf = OPENSSL_malloc(j)) == NULL) {

        OBJerr(OBJ_F_OBJ_TXT2OBJ, ERR_R_MALLOC_FAILURE);

        return NULL;

    }

    p = buf;

    /* Write out tag+length */

    ASN1_put_object(&p, 0, i, V_ASN1_OBJECT, V_ASN1_UNIVERSAL);

    /* Write out contents */

    a2d_ASN1_OBJECT(p, i, s, -1);

    cp = buf;

    op = d2i_ASN1_OBJECT(NULL, &cp, j);

    OPENSSL_free(buf);

    return op;

}

int OBJ_obj2txt(char *buf, int buf_len, const ASN1_OBJECT *a, int no_name)

{

    int i, n = 0, len, nid, first, use_bn;

    BIGNUM *bl;

    unsigned long l;

    const unsigned char *p;

    char tbuf[DECIMAL_SIZE(i) + DECIMAL_SIZE(l) + 2];

    /* Ensure that, at every state, |buf| is NUL-terminated. */

    if (buf && buf_len > 0)

        buf[0] = '\0';

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

        return 0;

    if (!no_name && (nid = OBJ_obj2nid(a)) != NID_undef) {

        const char *s;

        s = OBJ_nid2ln(nid);

        if (s == NULL)

            s = OBJ_nid2sn(nid);

        if (s) {

            if (buf)

                OPENSSL_strlcpy(buf, s, buf_len);

            n = strlen(s);

            return n;

        }

    }

    len = a->length;

    p = a->data;

    first = 1;

    bl = NULL;

    /*

     * RFC 2578 (STD 58) says this about OBJECT IDENTIFIERs:

     *

     * > 3.5. OBJECT IDENTIFIER values

     * >

     * > An OBJECT IDENTIFIER value is an ordered list of non-negative

     * > numbers. For the SMIv2, each number in the list is referred to as a

     * > sub-identifier, there are at most 128 sub-identifiers in a value,

     * > and each sub-identifier has a maximum value of 2^32-1 (4294967295

     * > decimal).

     *

     * So a legitimate OID according to this RFC is at most (32 * 128 / 7),

     * i.e. 586 bytes long.

     *

     * Ref: https://datatracker.ietf.org/doc/html/rfc2578#section-3.5

     */

    if (len > 586)

        goto err;

    while (len > 0) {

        l = 0;

        use_bn = 0;

        for (;;) {

            unsigned char c = *p++;

            len--;

            if ((len == 0) && (c & 0x80))

                goto err;

            if (use_bn) {

                if (!BN_add_word(bl, c & 0x7f))

                    goto err;

            } else

                l |= c & 0x7f;

            if (!(c & 0x80))

                break;

            if (!use_bn && (l > (ULONG_MAX >> 7L))) {

                if (bl == NULL && (bl = BN_new()) == NULL)

                    goto err;

                if (!BN_set_word(bl, l))

                    goto err;

                use_bn = 1;

            }

            if (use_bn) {

                if (!BN_lshift(bl, bl, 7))

                    goto err;

            } else

                l <<= 7L;

        }

        if (first) {

            first = 0;

            if (l >= 80) {

                i = 2;

                if (use_bn) {

                    if (!BN_sub_word(bl, 80))

                        goto err;

                } else

                    l -= 80;

            } else {

                i = (int)(l / 40);

                l -= (long)(i * 40);

            }

            if (buf && (buf_len > 1)) {

                *buf++ = i + '0';

                *buf = '\0';

                buf_len--;

            }

            n++;

        }

        if (use_bn) {

            char *bndec;

            bndec = BN_bn2dec(bl);

            if (!bndec)

                goto err;

            i = strlen(bndec);

            if (buf) {

                if (buf_len > 1) {

                    *buf++ = '.';

                    *buf = '\0';

                    buf_len--;

                }

                OPENSSL_strlcpy(buf, bndec, buf_len);

                if (i > buf_len) {

                    buf += buf_len;

                    buf_len = 0;

                } else {

                    buf += i;

                    buf_len -= i;

                }

            }

            n++;

            n += i;

            OPENSSL_free(bndec);

        } else {

            BIO_snprintf(tbuf, sizeof(tbuf), ".%lu", l);

            i = strlen(tbuf);

            if (buf && (buf_len > 0)) {

                OPENSSL_strlcpy(buf, tbuf, buf_len);

                if (i > buf_len) {

                    buf += buf_len;

                    buf_len = 0;

                } else {

                    buf += i;

                    buf_len -= i;

                }

            }

            n += i;

            l = 0;

        }

    }

    BN_free(bl);

    return n;

 err:

    BN_free(bl);

    return -1;

}

int OBJ_txt2nid(const char *s)

{

    ASN1_OBJECT *obj;

    int nid;

    obj = OBJ_txt2obj(s, 0);

    nid = OBJ_obj2nid(obj);

    ASN1_OBJECT_free(obj);

    return nid;

}

int OBJ_ln2nid(const char *s)

{

    ASN1_OBJECT o;

    const ASN1_OBJECT *oo = &o;

    ADDED_OBJ ad, *adp;

    const unsigned int *op;

    o.ln = s;

    if (added != NULL) {

        ad.type = ADDED_LNAME;

        ad.obj = &o;

        adp = lh_ADDED_OBJ_retrieve(added, &ad);

        if (adp != NULL)

            return adp->obj->nid;

    }

    op = OBJ_bsearch_ln(&oo, ln_objs, NUM_LN);

    if (op == NULL)

        return NID_undef;

    return nid_objs[*op].nid;

}

int OBJ_sn2nid(const char *s)

{

    ASN1_OBJECT o;

    const ASN1_OBJECT *oo = &o;

    ADDED_OBJ ad, *adp;

    const unsigned int *op;

    o.sn = s;

    if (added != NULL) {

        ad.type = ADDED_SNAME;

        ad.obj = &o;

        adp = lh_ADDED_OBJ_retrieve(added, &ad);

        if (adp != NULL)

            return adp->obj->nid;

    }

    op = OBJ_bsearch_sn(&oo, sn_objs, NUM_SN);

    if (op == NULL)

        return NID_undef;

    return nid_objs[*op].nid;

}

const void *OBJ_bsearch_(const void *key, const void *base, int num, int size,

                         int (*cmp) (const void *, const void *))

{

    return OBJ_bsearch_ex_(key, base, num, size, cmp, 0);

}

const void *OBJ_bsearch_ex_(const void *key, const void *base_, int num,

                            int size,

                            int (*cmp) (const void *, const void *),

                            int flags)

{

    const char *base = base_;

    int l, h, i = 0, c = 0;

    const char *p = NULL;

    if (num == 0)

        return NULL;

    l = 0;

    h = num;

    while (l < h) {

        i = (l + h) / 2;

        p = &(base[i * size]);

        c = (*cmp) (key, p);

        if (c < 0)

            h = i;

        else if (c > 0)

            l = i + 1;

        else

            break;

    }

#ifdef CHARSET_EBCDIC

    /*

     * THIS IS A KLUDGE - Because the *_obj is sorted in ASCII order, and I

     * don't have perl (yet), we revert to a *LINEAR* search when the object

     * wasn't found in the binary search.

     */

    if (c != 0) {

        for (i = 0; i < num; ++i) {

            p = &(base[i * size]);

            c = (*cmp) (key, p);

            if (c == 0 || (c < 0 && (flags & OBJ_BSEARCH_VALUE_ON_NOMATCH)))

                return p;

        }

    }

#endif

    if (c != 0 && !(flags & OBJ_BSEARCH_VALUE_ON_NOMATCH))

        p = NULL;

    else if (c == 0 && (flags & OBJ_BSEARCH_FIRST_VALUE_ON_MATCH)) {

        while (i > 0 && (*cmp) (key, &(base[(i - 1) * size])) == 0)

            i--;

        p = &(base[i * size]);

    }

    return p;

}

/*

 * Parse a BIO sink to create some extra oid's objects.

 * Line format:<OID:isdigit or '.']><isspace><SN><isspace><LN>

 */

int OBJ_create_objects(BIO *in)

{

    char buf[512];

    int i, num = 0;

    char *o, *s, *l = NULL;

    for (;;) {

        s = o = NULL;

        i = BIO_gets(in, buf, 512);

        if (i <= 0)

            return num;

        buf[i - 1] = '\0';

        if (!ossl_isalnum(buf[0]))

            return num;

        o = s = buf;

        while (ossl_isdigit(*s) || *s == '.')

            s++;

        if (*s != '\0') {

            *(s++) = '\0';

            while (ossl_isspace(*s))

                s++;

            if (*s == '\0') {

                s = NULL;

            } else {

                l = s;

                while (*l != '\0' && !ossl_isspace(*l))

                    l++;

                if (*l != '\0') {

                    *(l++) = '\0';

                    while (ossl_isspace(*l))

                        l++;

                    if (*l == '\0') {

                        l = NULL;

                    }

                } else {

                    l = NULL;

                }

            }

        } else {

            s = NULL;

        }

        if (*o == '\0')

            return num;

        if (!OBJ_create(o, s, l))

            return num;

        num++;

    }

}

int OBJ_create(const char *oid, const char *sn, const char *ln)

{

    ASN1_OBJECT *tmpoid = NULL;

    int ok = 0;

    /* Check to see if short or long name already present */

    if ((sn != NULL && OBJ_sn2nid(sn) != NID_undef)

            || (ln != NULL && OBJ_ln2nid(ln) != NID_undef)) {

        OBJerr(OBJ_F_OBJ_CREATE, OBJ_R_OID_EXISTS);

        return 0;

    }

    /* Convert numerical OID string to an ASN1_OBJECT structure */

    tmpoid = OBJ_txt2obj(oid, 1);

    if (tmpoid == NULL)

        return 0;

    /* If NID is not NID_undef then object already exists */

    if (OBJ_obj2nid(tmpoid) != NID_undef) {

        OBJerr(OBJ_F_OBJ_CREATE, OBJ_R_OID_EXISTS);

        goto err;

    }

    tmpoid->nid = OBJ_new_nid(1);

    tmpoid->sn = (char *)sn;

    tmpoid->ln = (char *)ln;

    ok = OBJ_add_object(tmpoid);

    tmpoid->sn = NULL;

    tmpoid->ln = NULL;

 err:

    ASN1_OBJECT_free(tmpoid);

    return ok;

}

size_t OBJ_length(const ASN1_OBJECT *obj)

{

    if (obj == NULL)

        return 0;

    return obj->length;

}

const unsigned char *OBJ_get0_data(const ASN1_OBJECT *obj)

{

    if (obj == NULL)

        return NULL;

    return obj->data;

}