/src/openssl111/crypto/asn1/asn1_lib.c

Source (jump to first uncovered line)
/*
 * Copyright 1995-2021 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>
#include "asn1_local.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;
}

/*
 * Decode a length field.
 * The short form is a single byte defining a length 0 - 127.
 * The long form is a byte 0 - 127 with the top bit set and this indicates
 * the number of following octets that contain the length.  These octets
 * are stored most significant digit first.
 */
static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
                           long max)
{
    const unsigned char *p = *pp;
    unsigned long ret = 0;
    int i;

    if (max-- < 1)
        return 0;
    if (*p == 0x80) {
        *inf = 1;
        p++;
    } else {
        *inf = 0;
        i = *p & 0x7f;
        if (*p++ & 0x80) {
            if (max < i + 1)
                return 0;
            /* Skip leading zeroes */
            while (i > 0 && *p == 0) {
                p++;
                i--;
            }
            if (i > (int)sizeof(long))
                return 0;
            while (i > 0) {
                ret <<= 8;
                ret |= *p++;
                i--;
            }
            if (ret > LONG_MAX)
                return 0;
        } else
            ret = i;
    }
    *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_in)
{
    unsigned char *c;
    const char *data = _data;
    size_t len;

    if (len_in < 0) {
        if (data == NULL)
            return 0;
        len = strlen(data);
    } else {
        len = (size_t)len_in;
    }
    /*
     * Verify that the length fits within an integer for assignment to
     * str->length below.  The additional 1 is subtracted to allow for the
     * '\0' terminator even though this isn't strictly necessary.
     */
    if (len > INT_MAX - 1) {
        ASN1err(0, ASN1_R_TOO_LARGE);
        return 0;
    }
    if ((size_t)str->length <= len || str->data == NULL) {
        c = str->data;
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
        /* No NUL terminator in fuzzing builds */
        str->data = OPENSSL_realloc(c, len != 0 ? len : 1);
#else
        str->data = OPENSSL_realloc(c, len + 1);
#endif
        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);
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
        /* Set the unused byte to something non NUL and printable. */
        if (len == 0)
            str->data[len] = '~';
#else
        /*
         * Add a NUL terminator. This should not be necessary - but we add it as
         * a safety precaution
         */
        str->data[len] = '\0';
#endif
    }
    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_embed_free(ASN1_STRING *a, int embed)
{
    if (a == NULL)
        return;
    if (!(a->flags & ASN1_STRING_FLAG_NDEF))
        OPENSSL_free(a->data);
    if (embed == 0)
        OPENSSL_free(a);
}

void ASN1_STRING_free(ASN1_STRING *a)
{
    if (a == NULL)
        return;
    asn1_string_embed_free(a, a->flags & ASN1_STRING_FLAG_EMBED);
}

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) {
        if (a->length != 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

Coverage Report

Created: 2023-06-08 06:40

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
3		*
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
8		*/
9
10		#include <stdio.h>
11		#include <limits.h>
12		#include "internal/cryptlib.h"
13		#include <openssl/asn1.h>
14		#include "asn1_local.h"
15
16		static int asn1_get_length(const unsigned char *pp, int inf, long *rl,
17		long max);
18		static void asn1_put_length(unsigned char **pp, int length);
19
20		static int _asn1_check_infinite_end(const unsigned char **p, long len)
21	0	{
22		/*
23		* If there is 0 or 1 byte left, the length check should pick things up
24		*/
25	0	if (len <= 0)
26	0	return 1;
27	0	else if ((len >= 2) && ((p)[0] == 0) && ((p)[1] == 0)) {
28	0	(*p) += 2;
29	0	return 1;
30	0	}
31	0	return 0;
32	0	}
33
34		int ASN1_check_infinite_end(unsigned char **p, long len)
35	0	{
36	0	return _asn1_check_infinite_end((const unsigned char **)p, len);
37	0	}
38
39		int ASN1_const_check_infinite_end(const unsigned char **p, long len)
40	0	{
41	0	return _asn1_check_infinite_end(p, len);
42	0	}
43
44		int ASN1_get_object(const unsigned char *pp, long plength, int *ptag,
45		int *pclass, long omax)
46	0	{
47	0	int i, ret;
48	0	long l;
49	0	const unsigned char p = pp;
50	0	int tag, xclass, inf;
51	0	long max = omax;
52
53	0	if (!max)
54	0	goto err;
55	0	ret = (*p & V_ASN1_CONSTRUCTED);
56	0	xclass = (*p & V_ASN1_PRIVATE);
57	0	i = *p & V_ASN1_PRIMITIVE_TAG;
58	0	if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */
59	0	p++;
60	0	if (--max == 0)
61	0	goto err;
62	0	l = 0;
63	0	while (*p & 0x80) {
64	0	l <<= 7L;
65	0	l \|= *(p++) & 0x7f;
66	0	if (--max == 0)
67	0	goto err;
68	0	if (l > (INT_MAX >> 7L))
69	0	goto err;
70	0	}
71	0	l <<= 7L;
72	0	l \|= *(p++) & 0x7f;
73	0	tag = (int)l;
74	0	if (--max == 0)
75	0	goto err;
76	0	} else {
77	0	tag = i;
78	0	p++;
79	0	if (--max == 0)
80	0	goto err;
81	0	}
82	0	*ptag = tag;
83	0	*pclass = xclass;
84	0	if (!asn1_get_length(&p, &inf, plength, max))
85	0	goto err;
86
87	0	if (inf && !(ret & V_ASN1_CONSTRUCTED))
88	0	goto err;
89
90	0	if (plength > (omax - (p - pp))) {
91	0	ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_TOO_LONG);
92		/*
93		* Set this so that even if things are not long enough the values are
94		* set correctly
95		*/
96	0	ret \|= 0x80;
97	0	}
98	0	*pp = p;
99	0	return ret \| inf;
100	0	err:
101	0	ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_HEADER_TOO_LONG);
102	0	return 0x80;
103	0	}
104
105		/*
106		* Decode a length field.
107		* The short form is a single byte defining a length 0 - 127.
108		* The long form is a byte 0 - 127 with the top bit set and this indicates
109		* the number of following octets that contain the length. These octets
110		* are stored most significant digit first.
111		*/
112		static int asn1_get_length(const unsigned char *pp, int inf, long *rl,
113		long max)
114	0	{
115	0	const unsigned char p = pp;
116	0	unsigned long ret = 0;
117	0	int i;
118
119	0	if (max-- < 1)
120	0	return 0;
121	0	if (*p == 0x80) {
122	0	*inf = 1;
123	0	p++;
124	0	} else {
125	0	*inf = 0;
126	0	i = *p & 0x7f;
127	0	if (*p++ & 0x80) {
128	0	if (max < i + 1)
129	0	return 0;
130		/* Skip leading zeroes */
131	0	while (i > 0 && *p == 0) {
132	0	p++;
133	0	i--;
134	0	}
135	0	if (i > (int)sizeof(long))
136	0	return 0;
137	0	while (i > 0) {
138	0	ret <<= 8;
139	0	ret \|= *p++;
140	0	i--;
141	0	}
142	0	if (ret > LONG_MAX)
143	0	return 0;
144	0	} else
145	0	ret = i;
146	0	}
147	0	*pp = p;
148	0	*rl = (long)ret;
149	0	return 1;
150	0	}
151
152		/*
153		* class 0 is constructed constructed == 2 for indefinite length constructed
154		*/
155		void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
156		int xclass)
157	0	{
158	0	unsigned char p = pp;
159	0	int i, ttag;
160
161	0	i = (constructed) ? V_ASN1_CONSTRUCTED : 0;
162	0	i \|= (xclass & V_ASN1_PRIVATE);
163	0	if (tag < 31)
164	0	*(p++) = i \| (tag & V_ASN1_PRIMITIVE_TAG);
165	0	else {
166	0	*(p++) = i \| V_ASN1_PRIMITIVE_TAG;
167	0	for (i = 0, ttag = tag; ttag > 0; i++)
168	0	ttag >>= 7;
169	0	ttag = i;
170	0	while (i-- > 0) {
171	0	p[i] = tag & 0x7f;
172	0	if (i != (ttag - 1))
173	0	p[i] \|= 0x80;
174	0	tag >>= 7;
175	0	}
176	0	p += ttag;
177	0	}
178	0	if (constructed == 2)
179	0	*(p++) = 0x80;
180	0	else
181	0	asn1_put_length(&p, length);
182	0	*pp = p;
183	0	}
184
185		int ASN1_put_eoc(unsigned char **pp)
186	0	{
187	0	unsigned char p = pp;
188	0	*p++ = 0;
189	0	*p++ = 0;
190	0	*pp = p;
191	0	return 2;
192	0	}
193
194		static void asn1_put_length(unsigned char **pp, int length)
195	0	{
196	0	unsigned char p = pp;
197	0	int i, l;
198	0	if (length <= 127)
199	0	*(p++) = (unsigned char)length;
200	0	else {
201	0	l = length;
202	0	for (i = 0; l > 0; i++)
203	0	l >>= 8;
204	0	*(p++) = i \| 0x80;
205	0	l = i;
206	0	while (i-- > 0) {
207	0	p[i] = length & 0xff;
208	0	length >>= 8;
209	0	}
210	0	p += l;
211	0	}
212	0	*pp = p;
213	0	}
214
215		int ASN1_object_size(int constructed, int length, int tag)
216	0	{
217	0	int ret = 1;
218	0	if (length < 0)
219	0	return -1;
220	0	if (tag >= 31) {
221	0	while (tag > 0) {
222	0	tag >>= 7;
223	0	ret++;
224	0	}
225	0	}
226	0	if (constructed == 2) {
227	0	ret += 3;
228	0	} else {
229	0	ret++;
230	0	if (length > 127) {
231	0	int tmplen = length;
232	0	while (tmplen > 0) {
233	0	tmplen >>= 8;
234	0	ret++;
235	0	}
236	0	}
237	0	}
238	0	if (ret >= INT_MAX - length)
239	0	return -1;
240	0	return ret + length;
241	0	}
242
243		int ASN1_STRING_copy(ASN1_STRING dst, const ASN1_STRING str)
244	0	{
245	0	if (str == NULL)
246	0	return 0;
247	0	dst->type = str->type;
248	0	if (!ASN1_STRING_set(dst, str->data, str->length))
249	0	return 0;
250		/* Copy flags but preserve embed value */
251	0	dst->flags &= ASN1_STRING_FLAG_EMBED;
252	0	dst->flags \|= str->flags & ~ASN1_STRING_FLAG_EMBED;
253	0	return 1;
254	0	}
255
256		ASN1_STRING ASN1_STRING_dup(const ASN1_STRING str)
257	0	{
258	0	ASN1_STRING *ret;
259	0	if (!str)
260	0	return NULL;
261	0	ret = ASN1_STRING_new();
262	0	if (ret == NULL)
263	0	return NULL;
264	0	if (!ASN1_STRING_copy(ret, str)) {
265	0	ASN1_STRING_free(ret);
266	0	return NULL;
267	0	}
268	0	return ret;
269	0	}
270
271		int ASN1_STRING_set(ASN1_STRING str, const void _data, int len_in)
272	0	{
273	0	unsigned char *c;
274	0	const char *data = _data;
275	0	size_t len;
276
277	0	if (len_in < 0) {
278	0	if (data == NULL)
279	0	return 0;
280	0	len = strlen(data);
281	0	} else {
282	0	len = (size_t)len_in;
283	0	}
284		/*
285		* Verify that the length fits within an integer for assignment to
286		* str->length below. The additional 1 is subtracted to allow for the
287		* '\0' terminator even though this isn't strictly necessary.
288		*/
289	0	if (len > INT_MAX - 1) {
290	0	ASN1err(0, ASN1_R_TOO_LARGE);
291	0	return 0;
292	0	}
293	0	if ((size_t)str->length <= len \|\| str->data == NULL) {
294	0	c = str->data;
295	0	#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
296		/* No NUL terminator in fuzzing builds */
297	0	str->data = OPENSSL_realloc(c, len != 0 ? len : 1);
298		#else
299		str->data = OPENSSL_realloc(c, len + 1);
300		#endif
301	0	if (str->data == NULL) {
302	0	ASN1err(ASN1_F_ASN1_STRING_SET, ERR_R_MALLOC_FAILURE);
303	0	str->data = c;
304	0	return 0;
305	0	}
306	0	}
307	0	str->length = len;
308	0	if (data != NULL) {
309	0	memcpy(str->data, data, len);
310	0	#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
311		/* Set the unused byte to something non NUL and printable. */
312	0	if (len == 0)
313	0	str->data[len] = '~';
314		#else
315		/*
316		* Add a NUL terminator. This should not be necessary - but we add it as
317		* a safety precaution
318		*/
319		str->data[len] = '\0';
320		#endif
321	0	}
322	0	return 1;
323	0	}
324
325		void ASN1_STRING_set0(ASN1_STRING str, void data, int len)
326	0	{
327	0	OPENSSL_free(str->data);
328	0	str->data = data;
329	0	str->length = len;
330	0	}
331
332		ASN1_STRING *ASN1_STRING_new(void)
333	0	{
334	0	return ASN1_STRING_type_new(V_ASN1_OCTET_STRING);
335	0	}
336
337		ASN1_STRING *ASN1_STRING_type_new(int type)
338	0	{
339	0	ASN1_STRING *ret;
340
341	0	ret = OPENSSL_zalloc(sizeof(*ret));
342	0	if (ret == NULL) {
343	0	ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW, ERR_R_MALLOC_FAILURE);
344	0	return NULL;
345	0	}
346	0	ret->type = type;
347	0	return ret;
348	0	}
349
350		void asn1_string_embed_free(ASN1_STRING *a, int embed)
351	0	{
352	0	if (a == NULL)
353	0	return;
354	0	if (!(a->flags & ASN1_STRING_FLAG_NDEF))
355	0	OPENSSL_free(a->data);
356	0	if (embed == 0)
357	0	OPENSSL_free(a);
358	0	}
359
360		void ASN1_STRING_free(ASN1_STRING *a)
361	0	{
362	0	if (a == NULL)
363	0	return;
364	0	asn1_string_embed_free(a, a->flags & ASN1_STRING_FLAG_EMBED);
365	0	}
366
367		void ASN1_STRING_clear_free(ASN1_STRING *a)
368	0	{
369	0	if (a == NULL)
370	0	return;
371	0	if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
372	0	OPENSSL_cleanse(a->data, a->length);
373	0	ASN1_STRING_free(a);
374	0	}
375
376		int ASN1_STRING_cmp(const ASN1_STRING a, const ASN1_STRING b)
377	0	{
378	0	int i;
379
380	0	i = (a->length - b->length);
381	0	if (i == 0) {
382	0	if (a->length != 0)
383	0	i = memcmp(a->data, b->data, a->length);
384	0	if (i == 0)
385	0	return a->type - b->type;
386	0	else
387	0	return i;
388	0	} else
389	0	return i;
390	0	}
391
392		int ASN1_STRING_length(const ASN1_STRING *x)
393	0	{
394	0	return x->length;
395	0	}
396
397		void ASN1_STRING_length_set(ASN1_STRING *x, int len)
398	0	{
399	0	x->length = len;
400	0	}
401
402		int ASN1_STRING_type(const ASN1_STRING *x)
403	0	{
404	0	return x->type;
405	0	}
406
407		const unsigned char ASN1_STRING_get0_data(const ASN1_STRING x)
408	0	{
409	0	return x->data;
410	0	}
411
412		# if OPENSSL_API_COMPAT < 0x10100000L
413		unsigned char ASN1_STRING_data(ASN1_STRING x)
414	0	{
415	0	return x->data;
416	0	}
417		#endif