Slight code cleanup for handling finished labels.
[openssl.git] / ssl / ssl_asn1.c
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 <openssl/asn1_mac.h>
62 #include <openssl/objects.h>
63 #include <openssl/x509.h>
64 #include "ssl_locl.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         ASN1_INTEGER time;
76         ASN1_INTEGER timeout;
77         ASN1_INTEGER verify_result;
78         } SSL_SESSION_ASN1;
79
80 int i2d_SSL_SESSION(SSL_SESSION *in, unsigned char **pp)
81         {
82 #define LSIZE2 (sizeof(long)*2)
83         int v1=0,v2=0,v3=0,v4=0,v5=0;
84         unsigned char buf[4],ibuf1[LSIZE2],ibuf2[LSIZE2];
85         unsigned char ibuf3[LSIZE2],ibuf4[LSIZE2],ibuf5[LSIZE2];
86         long l;
87         SSL_SESSION_ASN1 a;
88         M_ASN1_I2D_vars(in);
89
90         if ((in == NULL) || ((in->cipher == NULL) && (in->cipher_id == 0)))
91                 return(0);
92
93         /* Note that I cheat in the following 2 assignments.  I know
94          * that if the ASN1_INTERGER passed to ASN1_INTEGER_set
95          * is > sizeof(long)+1, the buffer will not be re-Malloc()ed.
96          * This is a bit evil but makes things simple, no dynamic allocation
97          * to clean up :-) */
98         a.version.length=LSIZE2;
99         a.version.type=V_ASN1_INTEGER;
100         a.version.data=ibuf1;
101         ASN1_INTEGER_set(&(a.version),SSL_SESSION_ASN1_VERSION);
102
103         a.ssl_version.length=LSIZE2;
104         a.ssl_version.type=V_ASN1_INTEGER;
105         a.ssl_version.data=ibuf2;
106         ASN1_INTEGER_set(&(a.ssl_version),in->ssl_version);
107
108         a.cipher.type=V_ASN1_OCTET_STRING;
109         a.cipher.data=buf;
110
111         if (in->cipher == NULL)
112                 l=in->cipher_id;
113         else
114                 l=in->cipher->id;
115         if (in->ssl_version == SSL2_VERSION)
116                 {
117                 a.cipher.length=3;
118                 buf[0]=((unsigned char)(l>>16L))&0xff;
119                 buf[1]=((unsigned char)(l>> 8L))&0xff;
120                 buf[2]=((unsigned char)(l     ))&0xff;
121                 }
122         else
123                 {
124                 a.cipher.length=2;
125                 buf[0]=((unsigned char)(l>>8L))&0xff;
126                 buf[1]=((unsigned char)(l    ))&0xff;
127                 }
128
129         a.master_key.length=in->master_key_length;
130         a.master_key.type=V_ASN1_OCTET_STRING;
131         a.master_key.data=in->master_key;
132
133         a.session_id.length=in->session_id_length;
134         a.session_id.type=V_ASN1_OCTET_STRING;
135         a.session_id.data=in->session_id;
136
137         a.session_id_context.length=in->sid_ctx_length;
138         a.session_id_context.type=V_ASN1_OCTET_STRING;
139         a.session_id_context.data=in->sid_ctx;
140
141         a.key_arg.length=in->key_arg_length;
142         a.key_arg.type=V_ASN1_OCTET_STRING;
143         a.key_arg.data=in->key_arg;
144
145         if (in->time != 0L)
146                 {
147                 a.time.length=LSIZE2;
148                 a.time.type=V_ASN1_INTEGER;
149                 a.time.data=ibuf3;
150                 ASN1_INTEGER_set(&(a.time),in->time);
151                 }
152
153         if (in->timeout != 0L)
154                 {
155                 a.timeout.length=LSIZE2;
156                 a.timeout.type=V_ASN1_INTEGER;
157                 a.timeout.data=ibuf4;
158                 ASN1_INTEGER_set(&(a.timeout),in->timeout);
159                 }
160
161         if (in->verify_result != X509_V_OK)
162                 {
163                 a.verify_result.length=LSIZE2;
164                 a.verify_result.type=V_ASN1_INTEGER;
165                 a.verify_result.data=ibuf5;
166                 ASN1_INTEGER_set(&a.verify_result,in->verify_result);
167                 }
168
169         M_ASN1_I2D_len(&(a.version),            i2d_ASN1_INTEGER);
170         M_ASN1_I2D_len(&(a.ssl_version),        i2d_ASN1_INTEGER);
171         M_ASN1_I2D_len(&(a.cipher),             i2d_ASN1_OCTET_STRING);
172         M_ASN1_I2D_len(&(a.session_id),         i2d_ASN1_OCTET_STRING);
173         M_ASN1_I2D_len(&(a.master_key),         i2d_ASN1_OCTET_STRING);
174         if (in->key_arg_length > 0)
175                 M_ASN1_I2D_len_IMP_opt(&(a.key_arg),i2d_ASN1_OCTET_STRING);
176         if (in->time != 0L)
177                 M_ASN1_I2D_len_EXP_opt(&(a.time),i2d_ASN1_INTEGER,1,v1);
178         if (in->timeout != 0L)
179                 M_ASN1_I2D_len_EXP_opt(&(a.timeout),i2d_ASN1_INTEGER,2,v2);
180         if (in->peer != NULL)
181                 M_ASN1_I2D_len_EXP_opt(in->peer,i2d_X509,3,v3);
182         M_ASN1_I2D_len_EXP_opt(&a.session_id_context,i2d_ASN1_OCTET_STRING,4,v4);
183         if (in->verify_result != X509_V_OK)
184                 M_ASN1_I2D_len_EXP_opt(&(a.verify_result),i2d_ASN1_INTEGER,5,v5);
185
186         M_ASN1_I2D_seq_total();
187
188         M_ASN1_I2D_put(&(a.version),            i2d_ASN1_INTEGER);
189         M_ASN1_I2D_put(&(a.ssl_version),        i2d_ASN1_INTEGER);
190         M_ASN1_I2D_put(&(a.cipher),             i2d_ASN1_OCTET_STRING);
191         M_ASN1_I2D_put(&(a.session_id),         i2d_ASN1_OCTET_STRING);
192         M_ASN1_I2D_put(&(a.master_key),         i2d_ASN1_OCTET_STRING);
193         if (in->key_arg_length > 0)
194                 M_ASN1_I2D_put_IMP_opt(&(a.key_arg),i2d_ASN1_OCTET_STRING,0);
195         if (in->time != 0L)
196                 M_ASN1_I2D_put_EXP_opt(&(a.time),i2d_ASN1_INTEGER,1,v1);
197         if (in->timeout != 0L)
198                 M_ASN1_I2D_put_EXP_opt(&(a.timeout),i2d_ASN1_INTEGER,2,v2);
199         if (in->peer != NULL)
200                 M_ASN1_I2D_put_EXP_opt(in->peer,i2d_X509,3,v3);
201         M_ASN1_I2D_put_EXP_opt(&a.session_id_context,i2d_ASN1_OCTET_STRING,4,
202                                v4);
203         if (in->verify_result != X509_V_OK)
204                 M_ASN1_I2D_put_EXP_opt(&a.verify_result,i2d_ASN1_INTEGER,5,v5);
205         M_ASN1_I2D_finish();
206         }
207
208 SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, unsigned char **pp,
209              long length)
210         {
211         int version,ssl_version=0,i;
212         long id;
213         ASN1_INTEGER ai,*aip;
214         ASN1_OCTET_STRING os,*osp;
215         M_ASN1_D2I_vars(a,SSL_SESSION *,SSL_SESSION_new);
216
217         aip= &ai;
218         osp= &os;
219
220         M_ASN1_D2I_Init();
221         M_ASN1_D2I_start_sequence();
222
223         ai.data=NULL; ai.length=0;
224         M_ASN1_D2I_get(aip,d2i_ASN1_INTEGER);
225         version=(int)ASN1_INTEGER_get(aip);
226         if (ai.data != NULL) { Free(ai.data); ai.data=NULL; ai.length=0; }
227
228         /* we don't care about the version right now :-) */
229         M_ASN1_D2I_get(aip,d2i_ASN1_INTEGER);
230         ssl_version=(int)ASN1_INTEGER_get(aip);
231         ret->ssl_version=ssl_version;
232         if (ai.data != NULL) { Free(ai.data); ai.data=NULL; ai.length=0; }
233
234         os.data=NULL; os.length=0;
235         M_ASN1_D2I_get(osp,d2i_ASN1_OCTET_STRING);
236         if (ssl_version == SSL2_VERSION)
237                 {
238                 if (os.length != 3)
239                         {
240                         c.error=SSL_R_CIPHER_CODE_WRONG_LENGTH;
241                         goto err;
242                         }
243                 id=0x02000000L|
244                         ((unsigned long)os.data[0]<<16L)|
245                         ((unsigned long)os.data[1]<< 8L)|
246                          (unsigned long)os.data[2];
247                 }
248         else if ((ssl_version>>8) == 3)
249                 {
250                 if (os.length != 2)
251                         {
252                         c.error=SSL_R_CIPHER_CODE_WRONG_LENGTH;
253                         goto err;
254                         }
255                 id=0x03000000L|
256                         ((unsigned long)os.data[0]<<8L)|
257                          (unsigned long)os.data[1];
258                 }
259         else
260                 {
261                 SSLerr(SSL_F_D2I_SSL_SESSION,SSL_R_UNKNOWN_SSL_VERSION);
262                 return(NULL);
263                 }
264         
265         ret->cipher=NULL;
266         ret->cipher_id=id;
267
268         M_ASN1_D2I_get(osp,d2i_ASN1_OCTET_STRING);
269         if ((ssl_version>>8) == SSL3_VERSION)
270                 i=SSL3_MAX_SSL_SESSION_ID_LENGTH;
271         else /* if (ssl_version == SSL2_VERSION) */
272                 i=SSL2_MAX_SSL_SESSION_ID_LENGTH;
273
274         if (os.length > i)
275                 os.length=i;
276
277         ret->session_id_length=os.length;
278         memcpy(ret->session_id,os.data,os.length);
279
280         M_ASN1_D2I_get(osp,d2i_ASN1_OCTET_STRING);
281         if (ret->master_key_length > SSL_MAX_MASTER_KEY_LENGTH)
282                 ret->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;
283         else
284                 ret->master_key_length=os.length;
285         memcpy(ret->master_key,os.data,ret->master_key_length);
286
287         os.length=0;
288         M_ASN1_D2I_get_IMP_opt(osp,d2i_ASN1_OCTET_STRING,0,V_ASN1_OCTET_STRING);
289         if (os.length > SSL_MAX_KEY_ARG_LENGTH)
290                 ret->key_arg_length=SSL_MAX_KEY_ARG_LENGTH;
291         else
292                 ret->key_arg_length=os.length;
293         memcpy(ret->key_arg,os.data,ret->key_arg_length);
294         if (os.data != NULL) Free(os.data);
295
296         ai.length=0;
297         M_ASN1_D2I_get_EXP_opt(aip,d2i_ASN1_INTEGER,1);
298         if (ai.data != NULL)
299                 {
300                 ret->time=ASN1_INTEGER_get(aip);
301                 Free(ai.data); ai.data=NULL; ai.length=0;
302                 }
303         else
304                 ret->time=time(NULL);
305
306         ai.length=0;
307         M_ASN1_D2I_get_EXP_opt(aip,d2i_ASN1_INTEGER,2);
308         if (ai.data != NULL)
309                 {
310                 ret->timeout=ASN1_INTEGER_get(aip);
311                 Free(ai.data); ai.data=NULL; ai.length=0;
312                 }
313         else
314                 ret->timeout=3;
315
316         if (ret->peer != NULL)
317                 {
318                 X509_free(ret->peer);
319                 ret->peer=NULL;
320                 }
321         M_ASN1_D2I_get_EXP_opt(ret->peer,d2i_X509,3);
322
323         os.length=0;
324         os.data=NULL;
325         M_ASN1_D2I_get_EXP_opt(osp,d2i_ASN1_OCTET_STRING,4);
326
327         if(os.data != NULL)
328             {
329             if (os.length > SSL_MAX_SID_CTX_LENGTH)
330                 SSLerr(SSL_F_D2I_SSL_SESSION,SSL_R_BAD_LENGTH);
331             ret->sid_ctx_length=os.length;
332             memcpy(ret->sid_ctx,os.data,os.length);
333             Free(os.data); os.data=NULL; os.length=0;
334             }
335         else
336             ret->sid_ctx_length=0;
337
338         ai.length=0;
339         M_ASN1_D2I_get_EXP_opt(aip,d2i_ASN1_INTEGER,5);
340         if (ai.data != NULL)
341                 {
342                 ret->verify_result=ASN1_INTEGER_get(aip);
343                 Free(ai.data); ai.data=NULL; ai.length=0;
344                 }
345         else
346                 ret->verify_result=X509_V_OK;
347
348         M_ASN1_D2I_Finish(a,SSL_SESSION_free,SSL_F_D2I_SSL_SESSION);
349         }