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1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2  * All rights reserved.
3  *
4  * This package is an SSL implementation written
5  * by Eric Young (eay@cryptsoft.com).
6  * The implementation was written so as to conform with Netscapes SSL.
7  *
8  * This library is free for commercial and non-commercial use as long as
9  * the following conditions are aheared to.  The following conditions
10  * apply to all code found in this distribution, be it the RC4, RSA,
11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
12  * included with this distribution is covered by the same copyright terms
13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14  *
15  * Copyright remains Eric Young's, and as such any Copyright notices in
16  * the code are not to be removed.
17  * If this package is used in a product, Eric Young should be given attribution
18  * as the author of the parts of the library used.
19  * This can be in the form of a textual message at program startup or
20  * in documentation (online or textual) provided with the package.
21  *
22  * Redistribution and use in source and binary forms, with or without
23  * modification, are permitted provided that the following conditions
24  * are met:
25  * 1. Redistributions of source code must retain the copyright
26  *    notice, this list of conditions and the following disclaimer.
27  * 2. Redistributions in binary form must reproduce the above copyright
28  *    notice, this list of conditions and the following disclaimer in the
29  *    documentation and/or other materials provided with the distribution.
30  * 3. All advertising materials mentioning features or use of this software
31  *    must display the following acknowledgement:
32  *    "This product includes cryptographic software written by
33  *     Eric Young (eay@cryptsoft.com)"
34  *    The word 'cryptographic' can be left out if the rouines from the library
35  *    being used are not cryptographic related :-).
36  * 4. If you include any Windows specific code (or a derivative thereof) from
37  *    the apps directory (application code) you must include an acknowledgement:
38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39  *
40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50  * SUCH DAMAGE.
51  *
52  * The licence and distribution terms for any publically available version or
53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
54  * copied and put under another distribution licence
55  * [including the GNU Public Licence.] */
56 
57 #include <openssl/asn1.h>
58 
59 #include <limits.h>
60 
61 #include <openssl/buf.h>
62 #include <openssl/err.h>
63 #include <openssl/mem.h>
64 
65 static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb);
66 
67 #ifndef NO_OLD_ASN1
68 # ifndef OPENSSL_NO_FP_API
69 
ASN1_d2i_fp(void * (* xnew)(void),d2i_of_void * d2i,FILE * in,void ** x)70 void *ASN1_d2i_fp(void *(*xnew) (void), d2i_of_void *d2i, FILE *in, void **x)
71 {
72     BIO *b;
73     void *ret;
74 
75     if ((b = BIO_new(BIO_s_file())) == NULL) {
76         OPENSSL_PUT_ERROR(ASN1, ERR_R_BUF_LIB);
77         return (NULL);
78     }
79     BIO_set_fp(b, in, BIO_NOCLOSE);
80     ret = ASN1_d2i_bio(xnew, d2i, b, x);
81     BIO_free(b);
82     return (ret);
83 }
84 # endif
85 
ASN1_d2i_bio(void * (* xnew)(void),d2i_of_void * d2i,BIO * in,void ** x)86 void *ASN1_d2i_bio(void *(*xnew) (void), d2i_of_void *d2i, BIO *in, void **x)
87 {
88     BUF_MEM *b = NULL;
89     const unsigned char *p;
90     void *ret = NULL;
91     int len;
92 
93     len = asn1_d2i_read_bio(in, &b);
94     if (len < 0)
95         goto err;
96 
97     p = (unsigned char *)b->data;
98     ret = d2i(x, &p, len);
99  err:
100     if (b != NULL)
101         BUF_MEM_free(b);
102     return (ret);
103 }
104 
105 #endif
106 
ASN1_item_d2i_bio(const ASN1_ITEM * it,BIO * in,void * x)107 void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x)
108 {
109     BUF_MEM *b = NULL;
110     const unsigned char *p;
111     void *ret = NULL;
112     int len;
113 
114     len = asn1_d2i_read_bio(in, &b);
115     if (len < 0)
116         goto err;
117 
118     p = (const unsigned char *)b->data;
119     ret = ASN1_item_d2i(x, &p, len, it);
120  err:
121     if (b != NULL)
122         BUF_MEM_free(b);
123     return (ret);
124 }
125 
126 #ifndef OPENSSL_NO_FP_API
ASN1_item_d2i_fp(const ASN1_ITEM * it,FILE * in,void * x)127 void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x)
128 {
129     BIO *b;
130     char *ret;
131 
132     if ((b = BIO_new(BIO_s_file())) == NULL) {
133         OPENSSL_PUT_ERROR(ASN1, ERR_R_BUF_LIB);
134         return (NULL);
135     }
136     BIO_set_fp(b, in, BIO_NOCLOSE);
137     ret = ASN1_item_d2i_bio(it, b, x);
138     BIO_free(b);
139     return (ret);
140 }
141 #endif
142 
143 typedef struct asn1_const_ctx_st
144     {
145     const unsigned char *p;/* work char pointer */
146     int eos;    /* end of sequence read for indefinite encoding */
147     int error;  /* error code to use when returning an error */
148     int inf;    /* constructed if 0x20, indefinite is 0x21 */
149     int tag;    /* tag from last 'get object' */
150     int xclass; /* class from last 'get object' */
151     long slen;  /* length of last 'get object' */
152     const unsigned char *max; /* largest value of p allowed */
153     const unsigned char *q;/* temporary variable */
154     const unsigned char **pp;/* variable */
155     int line;   /* used in error processing */
156     } ASN1_const_CTX;
157 
158 #define HEADER_SIZE   8
159 #define ASN1_CHUNK_INITIAL_SIZE (16 * 1024)
asn1_d2i_read_bio(BIO * in,BUF_MEM ** pb)160 static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb)
161 {
162     BUF_MEM *b;
163     unsigned char *p;
164     int i;
165     ASN1_const_CTX c;
166     size_t want = HEADER_SIZE;
167     int eos = 0;
168     size_t off = 0;
169     size_t len = 0;
170 
171     b = BUF_MEM_new();
172     if (b == NULL) {
173         OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
174         return -1;
175     }
176 
177     ERR_clear_error();
178     for (;;) {
179         if (want >= (len - off)) {
180             want -= (len - off);
181 
182             if (len + want < len || !BUF_MEM_grow_clean(b, len + want)) {
183                 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
184                 goto err;
185             }
186             i = BIO_read(in, &(b->data[len]), want);
187             if ((i < 0) && ((len - off) == 0)) {
188                 OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
189                 goto err;
190             }
191             if (i > 0) {
192                 if (len + i < len) {
193                     OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG);
194                     goto err;
195                 }
196                 len += i;
197             }
198         }
199         /* else data already loaded */
200 
201         p = (unsigned char *)&(b->data[off]);
202         c.p = p;
203         c.inf = ASN1_get_object(&(c.p), &(c.slen), &(c.tag), &(c.xclass),
204                                 len - off);
205         if (c.inf & 0x80) {
206             uint32_t e;
207 
208             e = ERR_GET_REASON(ERR_peek_error());
209             if (e != ASN1_R_TOO_LONG)
210                 goto err;
211             else
212                 ERR_clear_error(); /* clear error */
213         }
214         i = c.p - p;            /* header length */
215         off += i;               /* end of data */
216 
217         if (c.inf & 1) {
218             /* no data body so go round again */
219             eos++;
220             if (eos < 0) {
221                 OPENSSL_PUT_ERROR(ASN1, ASN1_R_HEADER_TOO_LONG);
222                 goto err;
223             }
224             want = HEADER_SIZE;
225         } else if (eos && (c.slen == 0) && (c.tag == V_ASN1_EOC)) {
226             /* eos value, so go back and read another header */
227             eos--;
228             if (eos <= 0)
229                 break;
230             else
231                 want = HEADER_SIZE;
232         } else {
233             /* suck in c.slen bytes of data */
234             want = c.slen;
235             if (want > (len - off)) {
236                 size_t chunk_max = ASN1_CHUNK_INITIAL_SIZE;
237                 want -= (len - off);
238                 if (want > INT_MAX /* BIO_read takes an int length */  ||
239                     len + want < len) {
240                     OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG);
241                     goto err;
242                 }
243                 while (want > 0) {
244                     /*
245                      * Read content in chunks of increasing size
246                      * so we can return an error for EOF without
247                      * having to allocate the entire content length
248                      * in one go.
249                      */
250                     size_t chunk = want > chunk_max ? chunk_max : want;
251 
252                     if (!BUF_MEM_grow_clean(b, len + chunk)) {
253                         OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
254                         goto err;
255                     }
256                     want -= chunk;
257                     while (chunk > 0) {
258                         i = BIO_read(in, &(b->data[len]), chunk);
259                         if (i <= 0) {
260                             OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
261                             goto err;
262                         }
263                         /*
264                          * This can't overflow because |len+want| didn't
265                          * overflow.
266                          */
267                         len += i;
268                         chunk -= i;
269                     }
270                     if (chunk_max < INT_MAX/2)
271                         chunk_max *= 2;
272                 }
273             }
274             if (off + c.slen < off) {
275                 OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG);
276                 goto err;
277             }
278             off += c.slen;
279             if (eos <= 0) {
280                 break;
281             } else
282                 want = HEADER_SIZE;
283         }
284     }
285 
286     if (off > INT_MAX) {
287         OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG);
288         goto err;
289     }
290 
291     *pb = b;
292     return off;
293  err:
294     if (b != NULL)
295         BUF_MEM_free(b);
296     return -1;
297 }
298