xref: /freebsd/crypto/openssl/ssl/ssl_asn1.c (revision 39beb93c) 
1 /* ssl/ssl_asn1.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  *
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  *
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  *
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  *
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  *
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58 
59 #include <stdio.h>
60 #include <stdlib.h>
61 #include "ssl_locl.h"
62 #include <openssl/asn1_mac.h>
63 #include <openssl/objects.h>
64 #include <openssl/x509.h>
65 
66 typedef struct ssl_session_asn1_st
67 	{
68 	ASN1_INTEGER version;
69 	ASN1_INTEGER ssl_version;
70 	ASN1_OCTET_STRING cipher;
71 	ASN1_OCTET_STRING master_key;
72 	ASN1_OCTET_STRING session_id;
73 	ASN1_OCTET_STRING session_id_context;
74 	ASN1_OCTET_STRING key_arg;
75 #ifndef OPENSSL_NO_KRB5
76         ASN1_OCTET_STRING krb5_princ;
77 #endif /* OPENSSL_NO_KRB5 */
78 	ASN1_INTEGER time;
79 	ASN1_INTEGER timeout;
80 	ASN1_INTEGER verify_result;
81 	} SSL_SESSION_ASN1;
82 
83 int i2d_SSL_SESSION(SSL_SESSION *in, unsigned char **pp)
84 	{
85 #define LSIZE2 (sizeof(long)*2)
86 	int v1=0,v2=0,v3=0,v4=0,v5=0;
87 	unsigned char buf[4],ibuf1[LSIZE2],ibuf2[LSIZE2];
88 	unsigned char ibuf3[LSIZE2],ibuf4[LSIZE2],ibuf5[LSIZE2];
89 	long l;
90 	SSL_SESSION_ASN1 a;
91 	M_ASN1_I2D_vars(in);
92 
93 	if ((in == NULL) || ((in->cipher == NULL) && (in->cipher_id == 0)))
94 		return(0);
95 
96 	/* Note that I cheat in the following 2 assignments.  I know
97 	 * that if the ASN1_INTEGER passed to ASN1_INTEGER_set
98 	 * is > sizeof(long)+1, the buffer will not be re-OPENSSL_malloc()ed.
99 	 * This is a bit evil but makes things simple, no dynamic allocation
100 	 * to clean up :-) */
101 	a.version.length=LSIZE2;
102 	a.version.type=V_ASN1_INTEGER;
103 	a.version.data=ibuf1;
104 	ASN1_INTEGER_set(&(a.version),SSL_SESSION_ASN1_VERSION);
105 
106 	a.ssl_version.length=LSIZE2;
107 	a.ssl_version.type=V_ASN1_INTEGER;
108 	a.ssl_version.data=ibuf2;
109 	ASN1_INTEGER_set(&(a.ssl_version),in->ssl_version);
110 
111 	a.cipher.type=V_ASN1_OCTET_STRING;
112 	a.cipher.data=buf;
113 
114 	if (in->cipher == NULL)
115 		l=in->cipher_id;
116 	else
117 		l=in->cipher->id;
118 	if (in->ssl_version == SSL2_VERSION)
119 		{
120 		a.cipher.length=3;
121 		buf[0]=((unsigned char)(l>>16L))&0xff;
122 		buf[1]=((unsigned char)(l>> 8L))&0xff;
123 		buf[2]=((unsigned char)(l     ))&0xff;
124 		}
125 	else
126 		{
127 		a.cipher.length=2;
128 		buf[0]=((unsigned char)(l>>8L))&0xff;
129 		buf[1]=((unsigned char)(l    ))&0xff;
130 		}
131 
132 	a.master_key.length=in->master_key_length;
133 	a.master_key.type=V_ASN1_OCTET_STRING;
134 	a.master_key.data=in->master_key;
135 
136 	a.session_id.length=in->session_id_length;
137 	a.session_id.type=V_ASN1_OCTET_STRING;
138 	a.session_id.data=in->session_id;
139 
140 	a.session_id_context.length=in->sid_ctx_length;
141 	a.session_id_context.type=V_ASN1_OCTET_STRING;
142 	a.session_id_context.data=in->sid_ctx;
143 
144 	a.key_arg.length=in->key_arg_length;
145 	a.key_arg.type=V_ASN1_OCTET_STRING;
146 	a.key_arg.data=in->key_arg;
147 
148 #ifndef OPENSSL_NO_KRB5
149 	if (in->krb5_client_princ_len)
150 		{
151 		a.krb5_princ.length=in->krb5_client_princ_len;
152 		a.krb5_princ.type=V_ASN1_OCTET_STRING;
153 		a.krb5_princ.data=in->krb5_client_princ;
154 		}
155 #endif /* OPENSSL_NO_KRB5 */
156 
157 	if (in->time != 0L)
158 		{
159 		a.time.length=LSIZE2;
160 		a.time.type=V_ASN1_INTEGER;
161 		a.time.data=ibuf3;
162 		ASN1_INTEGER_set(&(a.time),in->time);
163 		}
164 
165 	if (in->timeout != 0L)
166 		{
167 		a.timeout.length=LSIZE2;
168 		a.timeout.type=V_ASN1_INTEGER;
169 		a.timeout.data=ibuf4;
170 		ASN1_INTEGER_set(&(a.timeout),in->timeout);
171 		}
172 
173 	if (in->verify_result != X509_V_OK)
174 		{
175 		a.verify_result.length=LSIZE2;
176 		a.verify_result.type=V_ASN1_INTEGER;
177 		a.verify_result.data=ibuf5;
178 		ASN1_INTEGER_set(&a.verify_result,in->verify_result);
179 		}
180 
181 
182 	M_ASN1_I2D_len(&(a.version),		i2d_ASN1_INTEGER);
183 	M_ASN1_I2D_len(&(a.ssl_version),	i2d_ASN1_INTEGER);
184 	M_ASN1_I2D_len(&(a.cipher),		i2d_ASN1_OCTET_STRING);
185 	M_ASN1_I2D_len(&(a.session_id),		i2d_ASN1_OCTET_STRING);
186 	M_ASN1_I2D_len(&(a.master_key),		i2d_ASN1_OCTET_STRING);
187 #ifndef OPENSSL_NO_KRB5
188 	if (in->krb5_client_princ_len)
189         	M_ASN1_I2D_len(&(a.krb5_princ),	i2d_ASN1_OCTET_STRING);
190 #endif /* OPENSSL_NO_KRB5 */
191 	if (in->key_arg_length > 0)
192 		M_ASN1_I2D_len_IMP_opt(&(a.key_arg),i2d_ASN1_OCTET_STRING);
193 	if (in->time != 0L)
194 		M_ASN1_I2D_len_EXP_opt(&(a.time),i2d_ASN1_INTEGER,1,v1);
195 	if (in->timeout != 0L)
196 		M_ASN1_I2D_len_EXP_opt(&(a.timeout),i2d_ASN1_INTEGER,2,v2);
197 	if (in->peer != NULL)
198 		M_ASN1_I2D_len_EXP_opt(in->peer,i2d_X509,3,v3);
199 	M_ASN1_I2D_len_EXP_opt(&a.session_id_context,i2d_ASN1_OCTET_STRING,4,v4);
200 	if (in->verify_result != X509_V_OK)
201 		M_ASN1_I2D_len_EXP_opt(&(a.verify_result),i2d_ASN1_INTEGER,5,v5);
202 
203 	M_ASN1_I2D_seq_total();
204 
205 	M_ASN1_I2D_put(&(a.version),		i2d_ASN1_INTEGER);
206 	M_ASN1_I2D_put(&(a.ssl_version),	i2d_ASN1_INTEGER);
207 	M_ASN1_I2D_put(&(a.cipher),		i2d_ASN1_OCTET_STRING);
208 	M_ASN1_I2D_put(&(a.session_id),		i2d_ASN1_OCTET_STRING);
209 	M_ASN1_I2D_put(&(a.master_key),		i2d_ASN1_OCTET_STRING);
210 #ifndef OPENSSL_NO_KRB5
211 	if (in->krb5_client_princ_len)
212         	M_ASN1_I2D_put(&(a.krb5_princ),	i2d_ASN1_OCTET_STRING);
213 #endif /* OPENSSL_NO_KRB5 */
214 	if (in->key_arg_length > 0)
215 		M_ASN1_I2D_put_IMP_opt(&(a.key_arg),i2d_ASN1_OCTET_STRING,0);
216 	if (in->time != 0L)
217 		M_ASN1_I2D_put_EXP_opt(&(a.time),i2d_ASN1_INTEGER,1,v1);
218 	if (in->timeout != 0L)
219 		M_ASN1_I2D_put_EXP_opt(&(a.timeout),i2d_ASN1_INTEGER,2,v2);
220 	if (in->peer != NULL)
221 		M_ASN1_I2D_put_EXP_opt(in->peer,i2d_X509,3,v3);
222 	M_ASN1_I2D_put_EXP_opt(&a.session_id_context,i2d_ASN1_OCTET_STRING,4,
223 			       v4);
224 	if (in->verify_result != X509_V_OK)
225 		M_ASN1_I2D_put_EXP_opt(&a.verify_result,i2d_ASN1_INTEGER,5,v5);
226 	M_ASN1_I2D_finish();
227 	}
228 
229 SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, const unsigned char **pp,
230 	     long length)
231 	{
232 	int version,ssl_version=0,i;
233 	long id;
234 	ASN1_INTEGER ai,*aip;
235 	ASN1_OCTET_STRING os,*osp;
236 	M_ASN1_D2I_vars(a,SSL_SESSION *,SSL_SESSION_new);
237 
238 	aip= &ai;
239 	osp= &os;
240 
241 	M_ASN1_D2I_Init();
242 	M_ASN1_D2I_start_sequence();
243 
244 	ai.data=NULL; ai.length=0;
245 	M_ASN1_D2I_get_x(ASN1_INTEGER,aip,d2i_ASN1_INTEGER);
246 	version=(int)ASN1_INTEGER_get(aip);
247 	if (ai.data != NULL) { OPENSSL_free(ai.data); ai.data=NULL; ai.length=0; }
248 
249 	/* we don't care about the version right now :-) */
250 	M_ASN1_D2I_get_x(ASN1_INTEGER,aip,d2i_ASN1_INTEGER);
251 	ssl_version=(int)ASN1_INTEGER_get(aip);
252 	ret->ssl_version=ssl_version;
253 	if (ai.data != NULL) { OPENSSL_free(ai.data); ai.data=NULL; ai.length=0; }
254 
255 	os.data=NULL; os.length=0;
256 	M_ASN1_D2I_get_x(ASN1_OCTET_STRING,osp,d2i_ASN1_OCTET_STRING);
257 	if (ssl_version == SSL2_VERSION)
258 		{
259 		if (os.length != 3)
260 			{
261 			c.error=SSL_R_CIPHER_CODE_WRONG_LENGTH;
262 			goto err;
263 			}
264 		id=0x02000000L|
265 			((unsigned long)os.data[0]<<16L)|
266 			((unsigned long)os.data[1]<< 8L)|
267 			 (unsigned long)os.data[2];
268 		}
269 	else if ((ssl_version>>8) == SSL3_VERSION_MAJOR)
270 		{
271 		if (os.length != 2)
272 			{
273 			c.error=SSL_R_CIPHER_CODE_WRONG_LENGTH;
274 			goto err;
275 			}
276 		id=0x03000000L|
277 			((unsigned long)os.data[0]<<8L)|
278 			 (unsigned long)os.data[1];
279 		}
280 	else
281 		{
282 		SSLerr(SSL_F_D2I_SSL_SESSION,SSL_R_UNKNOWN_SSL_VERSION);
283 		return(NULL);
284 		}
285 
286 	ret->cipher=NULL;
287 	ret->cipher_id=id;
288 
289 	M_ASN1_D2I_get_x(ASN1_OCTET_STRING,osp,d2i_ASN1_OCTET_STRING);
290 	if ((ssl_version>>8) == SSL3_VERSION_MAJOR)
291 		i=SSL3_MAX_SSL_SESSION_ID_LENGTH;
292 	else /* if (ssl_version>>8 == SSL2_VERSION_MAJOR) */
293 		i=SSL2_MAX_SSL_SESSION_ID_LENGTH;
294 
295 	if (os.length > i)
296 		os.length = i;
297 	if (os.length > (int)sizeof(ret->session_id)) /* can't happen */
298 		os.length = sizeof(ret->session_id);
299 
300 	ret->session_id_length=os.length;
301 	OPENSSL_assert(os.length <= (int)sizeof(ret->session_id));
302 	memcpy(ret->session_id,os.data,os.length);
303 
304 	M_ASN1_D2I_get_x(ASN1_OCTET_STRING,osp,d2i_ASN1_OCTET_STRING);
305 	if (ret->master_key_length > SSL_MAX_MASTER_KEY_LENGTH)
306 		ret->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;
307 	else
308 		ret->master_key_length=os.length;
309 	memcpy(ret->master_key,os.data,ret->master_key_length);
310 
311 	os.length=0;
312 
313 #ifndef OPENSSL_NO_KRB5
314 	os.length=0;
315 	M_ASN1_D2I_get_opt(osp,d2i_ASN1_OCTET_STRING,V_ASN1_OCTET_STRING);
316 	if (os.data)
317 		{
318         	if (os.length > SSL_MAX_KRB5_PRINCIPAL_LENGTH)
319             		ret->krb5_client_princ_len=0;
320 		else
321 			ret->krb5_client_princ_len=os.length;
322 		memcpy(ret->krb5_client_princ,os.data,ret->krb5_client_princ_len);
323 		OPENSSL_free(os.data);
324 		os.data = NULL;
325 		os.length = 0;
326 		}
327 	else
328 		ret->krb5_client_princ_len=0;
329 #endif /* OPENSSL_NO_KRB5 */
330 
331 	M_ASN1_D2I_get_IMP_opt(osp,d2i_ASN1_OCTET_STRING,0,V_ASN1_OCTET_STRING);
332 	if (os.length > SSL_MAX_KEY_ARG_LENGTH)
333 		ret->key_arg_length=SSL_MAX_KEY_ARG_LENGTH;
334 	else
335 		ret->key_arg_length=os.length;
336 	memcpy(ret->key_arg,os.data,ret->key_arg_length);
337 	if (os.data != NULL) OPENSSL_free(os.data);
338 
339 	ai.length=0;
340 	M_ASN1_D2I_get_EXP_opt(aip,d2i_ASN1_INTEGER,1);
341 	if (ai.data != NULL)
342 		{
343 		ret->time=ASN1_INTEGER_get(aip);
344 		OPENSSL_free(ai.data); ai.data=NULL; ai.length=0;
345 		}
346 	else
347 		ret->time=(unsigned long)time(NULL);
348 
349 	ai.length=0;
350 	M_ASN1_D2I_get_EXP_opt(aip,d2i_ASN1_INTEGER,2);
351 	if (ai.data != NULL)
352 		{
353 		ret->timeout=ASN1_INTEGER_get(aip);
354 		OPENSSL_free(ai.data); ai.data=NULL; ai.length=0;
355 		}
356 	else
357 		ret->timeout=3;
358 
359 	if (ret->peer != NULL)
360 		{
361 		X509_free(ret->peer);
362 		ret->peer=NULL;
363 		}
364 	M_ASN1_D2I_get_EXP_opt(ret->peer,d2i_X509,3);
365 
366 	os.length=0;
367 	os.data=NULL;
368 	M_ASN1_D2I_get_EXP_opt(osp,d2i_ASN1_OCTET_STRING,4);
369 
370 	if(os.data != NULL)
371 	    {
372 	    if (os.length > SSL_MAX_SID_CTX_LENGTH)
373 		{
374 		ret->sid_ctx_length=os.length;
375 		SSLerr(SSL_F_D2I_SSL_SESSION,SSL_R_BAD_LENGTH);
376 		}
377 	    else
378 		{
379 		ret->sid_ctx_length=os.length;
380 		memcpy(ret->sid_ctx,os.data,os.length);
381 		}
382 	    OPENSSL_free(os.data); os.data=NULL; os.length=0;
383 	    }
384 	else
385 	    ret->sid_ctx_length=0;
386 
387 	ai.length=0;
388 	M_ASN1_D2I_get_EXP_opt(aip,d2i_ASN1_INTEGER,5);
389 	if (ai.data != NULL)
390 		{
391 		ret->verify_result=ASN1_INTEGER_get(aip);
392 		OPENSSL_free(ai.data); ai.data=NULL; ai.length=0;
393 		}
394 	else
395 		ret->verify_result=X509_V_OK;
396 
397 	M_ASN1_D2I_Finish(a,SSL_SESSION_free,SSL_F_D2I_SSL_SESSION);
398 	}
399