[thirdparty/openssl.git] / crypto / asn1 / asn1_lib.c

/*
 * Copyright 1995-2016 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 <limits.h>
#include "internal/cryptlib.h"
#include <openssl/asn1.h>

static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
                           long max);
static void asn1_put_length(unsigned char **pp, int length);

static int _asn1_check_infinite_end(const unsigned char **p, long len)
{
    /*
     * If there is 0 or 1 byte left, the length check should pick things up
     */
    if (len <= 0)
        return (1);
    else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) {
        (*p) += 2;
        return (1);
    }
    return (0);
}

int ASN1_check_infinite_end(unsigned char **p, long len)
{
    return _asn1_check_infinite_end((const unsigned char **)p, len);
}

int ASN1_const_check_infinite_end(const unsigned char **p, long len)
{
    return _asn1_check_infinite_end(p, len);
}

int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
                    int *pclass, long omax)
{
    int i, ret;
    long l;
    const unsigned char *p = *pp;
    int tag, xclass, inf;
    long max = omax;

    if (!max)
        goto err;
    ret = (*p & V_ASN1_CONSTRUCTED);
    xclass = (*p & V_ASN1_PRIVATE);
    i = *p & V_ASN1_PRIMITIVE_TAG;
    if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */
        p++;
        if (--max == 0)
            goto err;
        l = 0;
        while (*p & 0x80) {
            l <<= 7L;
            l |= *(p++) & 0x7f;
            if (--max == 0)
                goto err;
            if (l > (INT_MAX >> 7L))
                goto err;
        }
        l <<= 7L;
        l |= *(p++) & 0x7f;
        tag = (int)l;
        if (--max == 0)
            goto err;
    } else {
        tag = i;
        p++;
        if (--max == 0)
            goto err;
    }
    *ptag = tag;
    *pclass = xclass;
    if (!asn1_get_length(&p, &inf, plength, max))
        goto err;

    if (inf && !(ret & V_ASN1_CONSTRUCTED))
        goto err;

    if (*plength > (omax - (p - *pp))) {
        ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_TOO_LONG);
        /*
         * Set this so that even if things are not long enough the values are
         * set correctly
         */
        ret |= 0x80;
    }
    *pp = p;
    return (ret | inf);
 err:
    ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_HEADER_TOO_LONG);
    return (0x80);
}

static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
                           long max)
{
    const unsigned char *p = *pp;
    unsigned long ret = 0;
    unsigned long i;

    if (max-- < 1)
        return 0;
    if (*p == 0x80) {
        *inf = 1;
        ret = 0;
        p++;
    } else {
        *inf = 0;
        i = *p & 0x7f;
        if (*(p++) & 0x80) {
            if (max < (long)i + 1)
                return 0;
            /* Skip leading zeroes */
            while (i && *p == 0) {
                p++;
                i--;
            }
            if (i > sizeof(long))
                return 0;
            while (i-- > 0) {
                ret <<= 8L;
                ret |= *(p++);
            }
        } else
            ret = i;
    }
    if (ret > LONG_MAX)
        return 0;
    *pp = p;
    *rl = (long)ret;
    return 1;
}

/*
 * class 0 is constructed constructed == 2 for indefinite length constructed
 */
void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
                     int xclass)
{
    unsigned char *p = *pp;
    int i, ttag;

    i = (constructed) ? V_ASN1_CONSTRUCTED : 0;
    i |= (xclass & V_ASN1_PRIVATE);
    if (tag < 31)
        *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG);
    else {
        *(p++) = i | V_ASN1_PRIMITIVE_TAG;
        for (i = 0, ttag = tag; ttag > 0; i++)
            ttag >>= 7;
        ttag = i;
        while (i-- > 0) {
            p[i] = tag & 0x7f;
            if (i != (ttag - 1))
                p[i] |= 0x80;
            tag >>= 7;
        }
        p += ttag;
    }
    if (constructed == 2)
        *(p++) = 0x80;
    else
        asn1_put_length(&p, length);
    *pp = p;
}

int ASN1_put_eoc(unsigned char **pp)
{
    unsigned char *p = *pp;
    *p++ = 0;
    *p++ = 0;
    *pp = p;
    return 2;
}

static void asn1_put_length(unsigned char **pp, int length)
{
    unsigned char *p = *pp;
    int i, l;
    if (length <= 127)
        *(p++) = (unsigned char)length;
    else {
        l = length;
        for (i = 0; l > 0; i++)
            l >>= 8;
        *(p++) = i | 0x80;
        l = i;
        while (i-- > 0) {
            p[i] = length & 0xff;
            length >>= 8;
        }
        p += l;
    }
    *pp = p;
}

int ASN1_object_size(int constructed, int length, int tag)
{
    int ret = 1;
    if (length < 0)
        return -1;
    if (tag >= 31) {
        while (tag > 0) {
            tag >>= 7;
            ret++;
        }
    }
    if (constructed == 2) {
        ret += 3;
    } else {
        ret++;
        if (length > 127) {
            int tmplen = length;
            while (tmplen > 0) {
                tmplen >>= 8;
                ret++;
            }
        }
    }
    if (ret >= INT_MAX - length)
        return -1;
    return ret + length;
}

int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
{
    if (str == NULL)
        return 0;
    dst->type = str->type;
    if (!ASN1_STRING_set(dst, str->data, str->length))
        return 0;
    /* Copy flags but preserve embed value */
    dst->flags &= ASN1_STRING_FLAG_EMBED;
    dst->flags |= str->flags & ~ASN1_STRING_FLAG_EMBED;
    return 1;
}

ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
{
    ASN1_STRING *ret;
    if (!str)
        return NULL;
    ret = ASN1_STRING_new();
    if (ret == NULL)
        return NULL;
    if (!ASN1_STRING_copy(ret, str)) {
        ASN1_STRING_free(ret);
        return NULL;
    }
    return ret;
}

int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
{
    unsigned char *c;
    const char *data = _data;

    if (len < 0) {
        if (data == NULL)
            return (0);
        else
            len = strlen(data);
    }
    if ((str->length < len) || (str->data == NULL)) {
        c = str->data;
        str->data = OPENSSL_realloc(c, len + 1);
        if (str->data == NULL) {
            ASN1err(ASN1_F_ASN1_STRING_SET, ERR_R_MALLOC_FAILURE);
            str->data = c;
            return (0);
        }
    }
    str->length = len;
    if (data != NULL) {
        memcpy(str->data, data, len);
        /* an allowance for strings :-) */
        str->data[len] = '\0';
    }
    return (1);
}

void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
{
    OPENSSL_free(str->data);
    str->data = data;
    str->length = len;
}

ASN1_STRING *ASN1_STRING_new(void)
{
    return (ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
}

ASN1_STRING *ASN1_STRING_type_new(int type)
{
    ASN1_STRING *ret;

    ret = OPENSSL_zalloc(sizeof(*ret));
    if (ret == NULL) {
        ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW, ERR_R_MALLOC_FAILURE);
        return (NULL);
    }
    ret->type = type;
    return (ret);
}

void ASN1_STRING_free(ASN1_STRING *a)
{
    if (a == NULL)
        return;
    if (!(a->flags & ASN1_STRING_FLAG_NDEF))
        OPENSSL_free(a->data);
    if (!(a->flags & ASN1_STRING_FLAG_EMBED))
        OPENSSL_free(a);
}

void ASN1_STRING_clear_free(ASN1_STRING *a)
{
    if (a == NULL)
        return;
    if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
        OPENSSL_cleanse(a->data, a->length);
    ASN1_STRING_free(a);
}

int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
{
    int i;

    i = (a->length - b->length);
    if (i == 0) {
        i = memcmp(a->data, b->data, a->length);
        if (i == 0)
            return (a->type - b->type);
        else
            return (i);
    } else
        return (i);
}

int ASN1_STRING_length(const ASN1_STRING *x)
{
    return x->length;
}

void ASN1_STRING_length_set(ASN1_STRING *x, int len)
{
    x->length = len;
}

int ASN1_STRING_type(const ASN1_STRING *x)
{
    return x->type;
}

const unsigned char *ASN1_STRING_get0_data(const ASN1_STRING *x)
{
    return x->data;
}

# if OPENSSL_API_COMPAT < 0x10100000L
unsigned char *ASN1_STRING_data(ASN1_STRING *x)
{
    return x->data;
}
#endif
Commit	Line	Data
b1322259 RS	1	/*
b1322259 RS	2	* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
d02b48c6	3	*
b1322259 RS	4	* Licensed under the OpenSSL license (the "License"). You may not use
	5	* this file except in compliance with the License. You can obtain a copy
	6	* in the file LICENSE in the source distribution or at
	7	* https://www.openssl.org/source/license.html
d02b48c6 RE	8	*/
	9
	10	#include <stdio.h>
f9082268	11	#include <limits.h>
b39fc560	12	#include "internal/cryptlib.h"
ec577822	13	#include <openssl/asn1.h>
d02b48c6	14
0f113f3e	15	static int asn1_get_length(const unsigned char *pp, int inf, long *rl,
79c7f74d	16	long max);
d02b48c6	17	static void asn1_put_length(unsigned char **pp, int length);
d02b48c6	18
875a644a	19	static int _asn1_check_infinite_end(const unsigned char **p, long len)
0f113f3e MC	20	{
	21	/*
	22	* If there is 0 or 1 byte left, the length check should pick things up
	23	*/
	24	if (len <= 0)
	25	return (1);
	26	else if ((len >= 2) && ((p)[0] == 0) && ((p)[1] == 0)) {
	27	(*p) += 2;
	28	return (1);
	29	}
	30	return (0);
	31	}
d02b48c6	32
6343829a	33	int ASN1_check_infinite_end(unsigned char **p, long len)
0f113f3e MC	34	{
	35	return _asn1_check_infinite_end((const unsigned char **)p, len);
	36	}
d02b48c6	37
6343829a	38	int ASN1_const_check_infinite_end(const unsigned char **p, long len)
0f113f3e MC	39	{
	40	return _asn1_check_infinite_end(p, len);
	41	}
875a644a	42
6343829a	43	int ASN1_get_object(const unsigned char *pp, long plength, int *ptag,
0f113f3e MC	44	int *pclass, long omax)
	45	{
	46	int i, ret;
	47	long l;
	48	const unsigned char p = pp;
	49	int tag, xclass, inf;
	50	long max = omax;
	51
	52	if (!max)
	53	goto err;
	54	ret = (*p & V_ASN1_CONSTRUCTED);
	55	xclass = (*p & V_ASN1_PRIVATE);
	56	i = *p & V_ASN1_PRIMITIVE_TAG;
	57	if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */
	58	p++;
	59	if (--max == 0)
	60	goto err;
	61	l = 0;
	62	while (*p & 0x80) {
	63	l <<= 7L;
	64	l \|= *(p++) & 0x7f;
	65	if (--max == 0)
	66	goto err;
	67	if (l > (INT_MAX >> 7L))
	68	goto err;
	69	}
	70	l <<= 7L;
	71	l \|= *(p++) & 0x7f;
	72	tag = (int)l;
	73	if (--max == 0)
	74	goto err;
	75	} else {
	76	tag = i;
	77	p++;
	78	if (--max == 0)
	79	goto err;
	80	}
	81	*ptag = tag;
	82	*pclass = xclass;
79c7f74d	83	if (!asn1_get_length(&p, &inf, plength, max))
0f113f3e MC	84	goto err;
	85
	86	if (inf && !(ret & V_ASN1_CONSTRUCTED))
	87	goto err;
398e99fe	88
0f113f3e MC	89	if (plength > (omax - (p - pp))) {
	90	ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_TOO_LONG);
	91	/*
	92	* Set this so that even if things are not long enough the values are
	93	* set correctly
	94	*/
	95	ret \|= 0x80;
	96	}
	97	*pp = p;
	98	return (ret \| inf);
	99	err:
	100	ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_HEADER_TOO_LONG);
	101	return (0x80);
	102	}
	103
	104	static int asn1_get_length(const unsigned char *pp, int inf, long *rl,
79c7f74d	105	long max)
0f113f3e MC	106	{
	107	const unsigned char p = pp;
	108	unsigned long ret = 0;
79c7f74d	109	unsigned long i;
0f113f3e MC	110
0f113f3e MC	111	if (max-- < 1)
79c7f74d	112	return 0;
0f113f3e MC	113	if (*p == 0x80) {
	114	*inf = 1;
	115	ret = 0;
	116	p++;
	117	} else {
	118	*inf = 0;
	119	i = *p & 0x7f;
	120	if (*(p++) & 0x80) {
79c7f74d	121	if (max < (long)i + 1)
0f113f3e MC	122	return 0;
	123	/* Skip leading zeroes */
	124	while (i && *p == 0) {
	125	p++;
	126	i--;
	127	}
	128	if (i > sizeof(long))
	129	return 0;
	130	while (i-- > 0) {
	131	ret <<= 8L;
	132	ret \|= *(p++);
	133	}
	134	} else
	135	ret = i;
	136	}
	137	if (ret > LONG_MAX)
	138	return 0;
	139	*pp = p;
	140	*rl = (long)ret;
79c7f74d	141	return 1;
0f113f3e MC	142	}
	143
	144	/*
	145	* class 0 is constructed constructed == 2 for indefinite length constructed
	146	*/
6343829a	147	void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
0f113f3e MC	148	int xclass)
	149	{
	150	unsigned char p = pp;
	151	int i, ttag;
	152
	153	i = (constructed) ? V_ASN1_CONSTRUCTED : 0;
	154	i \|= (xclass & V_ASN1_PRIVATE);
	155	if (tag < 31)
	156	*(p++) = i \| (tag & V_ASN1_PRIMITIVE_TAG);
	157	else {
	158	*(p++) = i \| V_ASN1_PRIMITIVE_TAG;
	159	for (i = 0, ttag = tag; ttag > 0; i++)
	160	ttag >>= 7;
	161	ttag = i;
	162	while (i-- > 0) {
	163	p[i] = tag & 0x7f;
	164	if (i != (ttag - 1))
	165	p[i] \|= 0x80;
	166	tag >>= 7;
	167	}
	168	p += ttag;
	169	}
	170	if (constructed == 2)
	171	*(p++) = 0x80;
	172	else
	173	asn1_put_length(&p, length);
	174	*pp = p;
	175	}
d02b48c6	176
230fd6b7	177	int ASN1_put_eoc(unsigned char **pp)
0f113f3e MC	178	{
	179	unsigned char p = pp;
	180	*p++ = 0;
	181	*p++ = 0;
	182	*pp = p;
	183	return 2;
	184	}
230fd6b7	185
6b691a5c	186	static void asn1_put_length(unsigned char **pp, int length)
0f113f3e MC	187	{
	188	unsigned char p = pp;
	189	int i, l;
	190	if (length <= 127)
	191	*(p++) = (unsigned char)length;
	192	else {
	193	l = length;
	194	for (i = 0; l > 0; i++)
	195	l >>= 8;
	196	*(p++) = i \| 0x80;
	197	l = i;
	198	while (i-- > 0) {
	199	p[i] = length & 0xff;
	200	length >>= 8;
	201	}
	202	p += l;
	203	}
	204	*pp = p;
	205	}
d02b48c6	206
6343829a	207	int ASN1_object_size(int constructed, int length, int tag)
0f113f3e	208	{
e9f17097 DSH	209	int ret = 1;
	210	if (length < 0)
	211	return -1;
0f113f3e MC	212	if (tag >= 31) {
	213	while (tag > 0) {
	214	tag >>= 7;
	215	ret++;
	216	}
	217	}
e9f17097 DSH	218	if (constructed == 2) {
	219	ret += 3;
	220	} else {
	221	ret++;
	222	if (length > 127) {
	223	int tmplen = length;
	224	while (tmplen > 0) {
	225	tmplen >>= 8;
	226	ret++;
	227	}
0f113f3e MC	228	}
0f113f3e MC	229	}
e9f17097 DSH	230	if (ret >= INT_MAX - length)
	231	return -1;
	232	return ret + length;
0f113f3e	233	}
d02b48c6	234
18f54773	235	int ASN1_STRING_copy(ASN1_STRING dst, const ASN1_STRING str)
0f113f3e MC	236	{
	237	if (str == NULL)
	238	return 0;
	239	dst->type = str->type;
	240	if (!ASN1_STRING_set(dst, str->data, str->length))
	241	return 0;
4002da0f DSH	242	/* Copy flags but preserve embed value */
	243	dst->flags &= ASN1_STRING_FLAG_EMBED;
	244	dst->flags \|= str->flags & ~ASN1_STRING_FLAG_EMBED;
0f113f3e MC	245	return 1;
0f113f3e MC	246	}
18f54773	247
6384e46d	248	ASN1_STRING ASN1_STRING_dup(const ASN1_STRING str)
0f113f3e MC	249	{
	250	ASN1_STRING *ret;
	251	if (!str)
	252	return NULL;
	253	ret = ASN1_STRING_new();
90945fa3	254	if (ret == NULL)
0f113f3e MC	255	return NULL;
	256	if (!ASN1_STRING_copy(ret, str)) {
	257	ASN1_STRING_free(ret);
	258	return NULL;
	259	}
	260	return ret;
	261	}
d02b48c6	262
6343829a	263	int ASN1_STRING_set(ASN1_STRING str, const void _data, int len)
0f113f3e MC	264	{
	265	unsigned char *c;
	266	const char *data = _data;
	267
	268	if (len < 0) {
	269	if (data == NULL)
	270	return (0);
	271	else
	272	len = strlen(data);
	273	}
	274	if ((str->length < len) \|\| (str->data == NULL)) {
	275	c = str->data;
2d29e2df	276	str->data = OPENSSL_realloc(c, len + 1);
0f113f3e MC	277	if (str->data == NULL) {
	278	ASN1err(ASN1_F_ASN1_STRING_SET, ERR_R_MALLOC_FAILURE);
	279	str->data = c;
	280	return (0);
	281	}
	282	}
	283	str->length = len;
	284	if (data != NULL) {
	285	memcpy(str->data, data, len);
	286	/* an allowance for strings :-) */
	287	str->data[len] = '\0';
	288	}
	289	return (1);
	290	}
d02b48c6	291
6343829a	292	void ASN1_STRING_set0(ASN1_STRING str, void data, int len)
0f113f3e	293	{
b548a1f1	294	OPENSSL_free(str->data);
0f113f3e MC	295	str->data = data;
	296	str->length = len;
	297	}
399a6f0b	298
6b691a5c	299	ASN1_STRING *ASN1_STRING_new(void)
0f113f3e MC	300	{
	301	return (ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
	302	}
d02b48c6	303
6b691a5c	304	ASN1_STRING *ASN1_STRING_type_new(int type)
0f113f3e MC	305	{
	306	ASN1_STRING *ret;
	307
64b25758	308	ret = OPENSSL_zalloc(sizeof(*ret));
0f113f3e MC	309	if (ret == NULL) {
	310	ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW, ERR_R_MALLOC_FAILURE);
	311	return (NULL);
	312	}
0f113f3e	313	ret->type = type;
0f113f3e MC	314	return (ret);
0f113f3e MC	315	}
d02b48c6	316
6b691a5c	317	void ASN1_STRING_free(ASN1_STRING *a)
0f113f3e MC	318	{
	319	if (a == NULL)
	320	return;
b548a1f1	321	if (!(a->flags & ASN1_STRING_FLAG_NDEF))
0f113f3e	322	OPENSSL_free(a->data);
47c9a1b5 DSH	323	if (!(a->flags & ASN1_STRING_FLAG_EMBED))
47c9a1b5 DSH	324	OPENSSL_free(a);
0f113f3e	325	}
d02b48c6	326
a8ae0891 DSH	327	void ASN1_STRING_clear_free(ASN1_STRING *a)
a8ae0891 DSH	328	{
0dfb9398 RS	329	if (a == NULL)
	330	return;
	331	if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
a8ae0891 DSH	332	OPENSSL_cleanse(a->data, a->length);
	333	ASN1_STRING_free(a);
	334	}
	335
6384e46d	336	int ASN1_STRING_cmp(const ASN1_STRING a, const ASN1_STRING b)
0f113f3e MC	337	{
	338	int i;
	339
	340	i = (a->length - b->length);
	341	if (i == 0) {
	342	i = memcmp(a->data, b->data, a->length);
	343	if (i == 0)
	344	return (a->type - b->type);
	345	else
	346	return (i);
	347	} else
	348	return (i);
	349	}
d02b48c6	350
6343829a	351	int ASN1_STRING_length(const ASN1_STRING *x)
0f113f3e	352	{
f422a514	353	return x->length;
0f113f3e	354	}
08e9c1af	355
6343829a	356	void ASN1_STRING_length_set(ASN1_STRING *x, int len)
0f113f3e	357	{
f422a514	358	x->length = len;
0f113f3e	359	}
08e9c1af	360
08275a29	361	int ASN1_STRING_type(const ASN1_STRING *x)
0f113f3e	362	{
f422a514	363	return x->type;
0f113f3e MC	364	}
0f113f3e MC	365
17ebf85a DSH	366	const unsigned char ASN1_STRING_get0_data(const ASN1_STRING x)
	367	{
	368	return x->data;
	369	}
	370
	371	# if OPENSSL_API_COMPAT < 0x10100000L
0f113f3e MC	372	unsigned char ASN1_STRING_data(ASN1_STRING x)
0f113f3e MC	373	{
f422a514	374	return x->data;
0f113f3e	375	}
17ebf85a	376	#endif