/src/openssl/crypto/asn1/a_d2i_fp.c

Source
/*
 * Copyright 1995-2025 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 <limits.h>
#include "internal/cryptlib.h"
#include "internal/numbers.h"
#include <openssl/buffer.h>
#include <openssl/asn1.h>
#include "internal/asn1.h"
#include "crypto/asn1.h"

#ifndef NO_OLD_ASN1
# ifndef OPENSSL_NO_STDIO

void *ASN1_d2i_fp(void *(*xnew) (void), d2i_of_void *d2i, FILE *in, void **x)
{
    BIO *b;
    void *ret;

    if ((b = BIO_new(BIO_s_file())) == NULL) {
        ERR_raise(ERR_LIB_ASN1, ERR_R_BUF_LIB);
        return NULL;
    }
    BIO_set_fp(b, in, BIO_NOCLOSE);
    ret = ASN1_d2i_bio(xnew, d2i, b, x);
    BIO_free(b);
    return ret;
}
# endif

void *ASN1_d2i_bio(void *(*xnew) (void), d2i_of_void *d2i, BIO *in, void **x)
{
    BUF_MEM *b = NULL;
    const unsigned char *p;
    void *ret = NULL;
    int len;

    len = asn1_d2i_read_bio(in, &b);
    if (len < 0)
        goto err;

    p = (unsigned char *)b->data;
    ret = d2i(x, &p, len);
 err:
    BUF_MEM_free(b);
    return ret;
}

#endif

void *ASN1_item_d2i_bio_ex(const ASN1_ITEM *it, BIO *in, void *x,
                           OSSL_LIB_CTX *libctx, const char *propq)
{
    BUF_MEM *b = NULL;
    const unsigned char *p;
    void *ret = NULL;
    int len;

    if (in == NULL)
        return NULL;
    len = asn1_d2i_read_bio(in, &b);
    if (len < 0)
        goto err;

    p = (const unsigned char *)b->data;
    ret = ASN1_item_d2i_ex(x, &p, len, it, libctx, propq);
 err:
    BUF_MEM_free(b);
    return ret;
}

void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x)
{
    return ASN1_item_d2i_bio_ex(it, in, x, NULL, NULL);
}

#ifndef OPENSSL_NO_STDIO
void *ASN1_item_d2i_fp_ex(const ASN1_ITEM *it, FILE *in, void *x,
                          OSSL_LIB_CTX *libctx, const char *propq)
{
    BIO *b;
    void *ret;

    if ((b = BIO_new(BIO_s_file())) == NULL) {
        ERR_raise(ERR_LIB_ASN1, ERR_R_BUF_LIB);
        return NULL;
    }
    BIO_set_fp(b, in, BIO_NOCLOSE);
    ret = ASN1_item_d2i_bio_ex(it, b, x, libctx, propq);
    BIO_free(b);
    return ret;
}

void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x)
{
    return ASN1_item_d2i_fp_ex(it, in, x, NULL, NULL);
}
#endif

#define HEADER_SIZE   8
#define ASN1_CHUNK_INITIAL_SIZE (16 * 1024)
int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb)
{
    BUF_MEM *b;
    unsigned char *p;
    size_t want = HEADER_SIZE;
    uint32_t eos = 0;
    size_t off = 0;
    size_t len = 0;
    size_t diff;

    const unsigned char *q;
    long slen;
    int inf, tag, xclass;

    b = BUF_MEM_new();
    if (b == NULL) {
        ERR_raise(ERR_LIB_ASN1, ERR_R_BUF_LIB);
        return -1;
    }

    ERR_set_mark();
    for (;;) {
        diff = len - off;
        if (want >= diff) {
            int i;

            want -= diff;

            if (len + want < len || !BUF_MEM_grow_clean(b, len + want)) {
                ERR_raise(ERR_LIB_ASN1, ERR_R_BUF_LIB);
                goto err;
            }
            i = BIO_read(in, &(b->data[len]), (int)want);

            if (i <= 0 && diff == 0) {
                ERR_raise(ERR_LIB_ASN1, ASN1_R_NOT_ENOUGH_DATA);
                goto err;
            }

            if (i > 0) {
                if (len + i < len) {
                    ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LONG);
                    goto err;
                }
                len += i;
                if ((size_t)i < want)
                    continue;

            }
        }
        /* else data already loaded */

        p = (unsigned char *)&(b->data[off]);
        q = p;
        diff = len - off;
        if (diff == 0)
            goto err;
        inf = ASN1_get_object(&q, &slen, &tag, &xclass, (int)diff);
        if (inf & 0x80) {
            unsigned long e;

            e = ERR_GET_REASON(ERR_peek_last_error());
            if (e != ASN1_R_TOO_LONG)
                goto err;
            ERR_pop_to_mark();
        }
        off += q - p;               /* end of data */

        if (inf & 1) {
            /* no data body so go round again */
            if (eos == UINT32_MAX) {
                ERR_raise(ERR_LIB_ASN1, ASN1_R_HEADER_TOO_LONG);
                goto err;
            }
            eos++;
            want = HEADER_SIZE;
        } else if (eos && (slen == 0) && (tag == V_ASN1_EOC)) {
            /* eos value, so go back and read another header */
            eos--;
            if (eos == 0)
                break;
            else
                want = HEADER_SIZE;
        } else {
            /* suck in slen bytes of data */
            want = slen;
            if (want > (len - off)) {
                size_t chunk_max = ASN1_CHUNK_INITIAL_SIZE;

                want -= (len - off);
                if (want > INT_MAX /* BIO_read takes an int length */  ||
                    len + want < len) {
                    ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LONG);
                    goto err;
                }
                while (want > 0) {
                    /*
                     * Read content in chunks of increasing size
                     * so we can return an error for EOF without
                     * having to allocate the entire content length
                     * in one go.
                     */
                    size_t chunk = want > chunk_max ? chunk_max : want;
                    int i;

                    if (!BUF_MEM_grow_clean(b, len + chunk)) {
                        ERR_raise(ERR_LIB_ASN1, ERR_R_BUF_LIB);
                        goto err;
                    }
                    want -= chunk;
                    while (chunk > 0) {
                        i = BIO_read(in, &(b->data[len]), (int)chunk);
                        if (i <= 0) {
                            ERR_raise(ERR_LIB_ASN1, ASN1_R_NOT_ENOUGH_DATA);
                            goto err;
                        }
                    /*
                     * This can't overflow because |len+want| didn't
                     * overflow.
                     */
                        len += i;
                        chunk -= i;
                    }
                    if (chunk_max < INT_MAX/2)
                        chunk_max *= 2;
                }
            }
            if (off + slen < off) {
                ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LONG);
                goto err;
            }
            off += slen;
            if (eos == 0) {
                break;
            } else
                want = HEADER_SIZE;
        }
    }

    if (off > INT_MAX) {
        ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LONG);
        goto err;
    }

    *pb = b;
    return (int)off;
 err:
    ERR_clear_last_mark();
    BUF_MEM_free(b);
    return -1;
}

Coverage Report

Created: 2025-11-24 06:26

Line	Count	Source
1		/*
2		* Copyright 1995-2025 The OpenSSL Project Authors. All Rights Reserved.
3		*
4		* Licensed under the Apache License 2.0 (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 "internal/numbers.h"
14		#include <openssl/buffer.h>
15		#include <openssl/asn1.h>
16		#include "internal/asn1.h"
17		#include "crypto/asn1.h"
18
19		#ifndef NO_OLD_ASN1
20		# ifndef OPENSSL_NO_STDIO
21
22		void ASN1_d2i_fp(void (xnew) (void), d2i_of_void d2i, FILE in, void *x)
23	0	{
24	0	BIO *b;
25	0	void *ret;
26
27	0	if ((b = BIO_new(BIO_s_file())) == NULL) {
28	0	ERR_raise(ERR_LIB_ASN1, ERR_R_BUF_LIB);
29	0	return NULL;
30	0	}
31	0	BIO_set_fp(b, in, BIO_NOCLOSE);
32	0	ret = ASN1_d2i_bio(xnew, d2i, b, x);
33	0	BIO_free(b);
34	0	return ret;
35	0	}
36		# endif
37
38		void ASN1_d2i_bio(void (xnew) (void), d2i_of_void d2i, BIO in, void *x)
39	0	{
40	0	BUF_MEM *b = NULL;
41	0	const unsigned char *p;
42	0	void *ret = NULL;
43	0	int len;
44
45	0	len = asn1_d2i_read_bio(in, &b);
46	0	if (len < 0)
47	0	goto err;
48
49	0	p = (unsigned char *)b->data;
50	0	ret = d2i(x, &p, len);
51	0	err:
52	0	BUF_MEM_free(b);
53	0	return ret;
54	0	}
55
56		#endif
57
58		void ASN1_item_d2i_bio_ex(const ASN1_ITEM it, BIO in, void x,
59		OSSL_LIB_CTX libctx, const char propq)
60	0	{
61	0	BUF_MEM *b = NULL;
62	0	const unsigned char *p;
63	0	void *ret = NULL;
64	0	int len;
65
66	0	if (in == NULL)
67	0	return NULL;
68	0	len = asn1_d2i_read_bio(in, &b);
69	0	if (len < 0)
70	0	goto err;
71
72	0	p = (const unsigned char *)b->data;
73	0	ret = ASN1_item_d2i_ex(x, &p, len, it, libctx, propq);
74	0	err:
75	0	BUF_MEM_free(b);
76	0	return ret;
77	0	}
78
79		void ASN1_item_d2i_bio(const ASN1_ITEM it, BIO in, void x)
80	0	{
81	0	return ASN1_item_d2i_bio_ex(it, in, x, NULL, NULL);
82	0	}
83
84		#ifndef OPENSSL_NO_STDIO
85		void ASN1_item_d2i_fp_ex(const ASN1_ITEM it, FILE in, void x,
86		OSSL_LIB_CTX libctx, const char propq)
87	0	{
88	0	BIO *b;
89	0	void *ret;
90
91	0	if ((b = BIO_new(BIO_s_file())) == NULL) {
92	0	ERR_raise(ERR_LIB_ASN1, ERR_R_BUF_LIB);
93	0	return NULL;
94	0	}
95	0	BIO_set_fp(b, in, BIO_NOCLOSE);
96	0	ret = ASN1_item_d2i_bio_ex(it, b, x, libctx, propq);
97	0	BIO_free(b);
98	0	return ret;
99	0	}
100
101		void ASN1_item_d2i_fp(const ASN1_ITEM it, FILE in, void x)
102	0	{
103	0	return ASN1_item_d2i_fp_ex(it, in, x, NULL, NULL);
104	0	}
105		#endif
106
107	0	#define HEADER_SIZE 8
108	0	#define ASN1_CHUNK_INITIAL_SIZE (16 * 1024)
109		int asn1_d2i_read_bio(BIO in, BUF_MEM *pb)
110	0	{
111	0	BUF_MEM *b;
112	0	unsigned char *p;
113	0	size_t want = HEADER_SIZE;
114	0	uint32_t eos = 0;
115	0	size_t off = 0;
116	0	size_t len = 0;
117	0	size_t diff;
118
119	0	const unsigned char *q;
120	0	long slen;
121	0	int inf, tag, xclass;
122
123	0	b = BUF_MEM_new();
124	0	if (b == NULL) {
125	0	ERR_raise(ERR_LIB_ASN1, ERR_R_BUF_LIB);
126	0	return -1;
127	0	}
128
129	0	ERR_set_mark();
130	0	for (;;) {
131	0	diff = len - off;
132	0	if (want >= diff) {
133	0	int i;
134
135	0	want -= diff;
136
137	0	if (len + want < len \|\| !BUF_MEM_grow_clean(b, len + want)) {
138	0	ERR_raise(ERR_LIB_ASN1, ERR_R_BUF_LIB);
139	0	goto err;
140	0	}
141	0	i = BIO_read(in, &(b->data[len]), (int)want);
142
143	0	if (i <= 0 && diff == 0) {
144	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_NOT_ENOUGH_DATA);
145	0	goto err;
146	0	}
147
148	0	if (i > 0) {
149	0	if (len + i < len) {
150	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LONG);
151	0	goto err;
152	0	}
153	0	len += i;
154	0	if ((size_t)i < want)
155	0	continue;
156
157	0	}
158	0	}
159		/* else data already loaded */
160
161	0	p = (unsigned char *)&(b->data[off]);
162	0	q = p;
163	0	diff = len - off;
164	0	if (diff == 0)
165	0	goto err;
166	0	inf = ASN1_get_object(&q, &slen, &tag, &xclass, (int)diff);
167	0	if (inf & 0x80) {
168	0	unsigned long e;
169
170	0	e = ERR_GET_REASON(ERR_peek_last_error());
171	0	if (e != ASN1_R_TOO_LONG)
172	0	goto err;
173	0	ERR_pop_to_mark();
174	0	}
175	0	off += q - p; /* end of data */
176
177	0	if (inf & 1) {
178		/* no data body so go round again */
179	0	if (eos == UINT32_MAX) {
180	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_HEADER_TOO_LONG);
181	0	goto err;
182	0	}
183	0	eos++;
184	0	want = HEADER_SIZE;
185	0	} else if (eos && (slen == 0) && (tag == V_ASN1_EOC)) {
186		/* eos value, so go back and read another header */
187	0	eos--;
188	0	if (eos == 0)
189	0	break;
190	0	else
191	0	want = HEADER_SIZE;
192	0	} else {
193		/* suck in slen bytes of data */
194	0	want = slen;
195	0	if (want > (len - off)) {
196	0	size_t chunk_max = ASN1_CHUNK_INITIAL_SIZE;
197
198	0	want -= (len - off);
199	0	if (want > INT_MAX /* BIO_read takes an int length */ \|\|
200	0	len + want < len) {
201	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LONG);
202	0	goto err;
203	0	}
204	0	while (want > 0) {
205		/*
206		* Read content in chunks of increasing size
207		* so we can return an error for EOF without
208		* having to allocate the entire content length
209		* in one go.
210		*/
211	0	size_t chunk = want > chunk_max ? chunk_max : want;
212	0	int i;
213
214	0	if (!BUF_MEM_grow_clean(b, len + chunk)) {
215	0	ERR_raise(ERR_LIB_ASN1, ERR_R_BUF_LIB);
216	0	goto err;
217	0	}
218	0	want -= chunk;
219	0	while (chunk > 0) {
220	0	i = BIO_read(in, &(b->data[len]), (int)chunk);
221	0	if (i <= 0) {
222	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_NOT_ENOUGH_DATA);
223	0	goto err;
224	0	}
225		/*
226		* This can't overflow because \|len+want\| didn't
227		* overflow.
228		*/
229	0	len += i;
230	0	chunk -= i;
231	0	}
232	0	if (chunk_max < INT_MAX/2)
233	0	chunk_max *= 2;
234	0	}
235	0	}
236	0	if (off + slen < off) {
237	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LONG);
238	0	goto err;
239	0	}
240	0	off += slen;
241	0	if (eos == 0) {
242	0	break;
243	0	} else
244	0	want = HEADER_SIZE;
245	0	}
246	0	}
247
248	0	if (off > INT_MAX) {
249	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LONG);
250	0	goto err;
251	0	}
252
253	0	*pb = b;
254	0	return (int)off;
255	0	err:
256	0	ERR_clear_last_mark();
257	0	BUF_MEM_free(b);
258	0	return -1;
259	0	}