fix more race conditions
[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 "ssl_locl.h"
62 #include <openssl/asn1_mac.h>
63 #include <openssl/objects.h>
64 #include <openssl/x509.h>
65 #include "cryptlib.h"
66
67 typedef struct ssl_session_asn1_st
68         {
69         ASN1_INTEGER version;
70         ASN1_INTEGER ssl_version;
71         ASN1_OCTET_STRING cipher;
72         ASN1_OCTET_STRING master_key;
73         ASN1_OCTET_STRING session_id;
74         ASN1_OCTET_STRING session_id_context;
75         ASN1_OCTET_STRING key_arg;
76 #ifndef OPENSSL_NO_KRB5
77         ASN1_OCTET_STRING krb5_princ;
78 #endif /* OPENSSL_NO_KRB5 */
79         ASN1_INTEGER time;
80         ASN1_INTEGER timeout;
81         ASN1_INTEGER verify_result;
82         } SSL_SESSION_ASN1;
83
84 int i2d_SSL_SESSION(SSL_SESSION *in, unsigned char **pp)
85         {
86 #define LSIZE2 (sizeof(long)*2)
87         int v1=0,v2=0,v3=0,v4=0,v5=0;
88         unsigned char buf[4],ibuf1[LSIZE2],ibuf2[LSIZE2];
89         unsigned char ibuf3[LSIZE2],ibuf4[LSIZE2],ibuf5[LSIZE2];
90         long l;
91         SSL_SESSION_ASN1 a;
92         M_ASN1_I2D_vars(in);
93
94         if ((in == NULL) || ((in->cipher == NULL) && (in->cipher_id == 0)))
95                 return(0);
96
97         /* Note that I cheat in the following 2 assignments.  I know
98          * that if the ASN1_INTEGER passed to ASN1_INTEGER_set
99          * is > sizeof(long)+1, the buffer will not be re-OPENSSL_malloc()ed.
100          * This is a bit evil but makes things simple, no dynamic allocation
101          * to clean up :-) */
102         a.version.length=LSIZE2;
103         a.version.type=V_ASN1_INTEGER;
104         a.version.data=ibuf1;
105         ASN1_INTEGER_set(&(a.version),SSL_SESSION_ASN1_VERSION);
106
107         a.ssl_version.length=LSIZE2;
108         a.ssl_version.type=V_ASN1_INTEGER;
109         a.ssl_version.data=ibuf2;
110         ASN1_INTEGER_set(&(a.ssl_version),in->ssl_version);
111
112         a.cipher.type=V_ASN1_OCTET_STRING;
113         a.cipher.data=buf;
114
115         if (in->cipher == NULL)
116                 l=in->cipher_id;
117         else
118                 l=in->cipher->id;
119         if (in->ssl_version == SSL2_VERSION)
120                 {
121                 a.cipher.length=3;
122                 buf[0]=((unsigned char)(l>>16L))&0xff;
123                 buf[1]=((unsigned char)(l>> 8L))&0xff;
124                 buf[2]=((unsigned char)(l     ))&0xff;
125                 }
126         else
127                 {
128                 a.cipher.length=2;
129                 buf[0]=((unsigned char)(l>>8L))&0xff;
130                 buf[1]=((unsigned char)(l    ))&0xff;
131                 }
132
133         a.master_key.length=in->master_key_length;
134         a.master_key.type=V_ASN1_OCTET_STRING;
135         a.master_key.data=in->master_key;
136
137         a.session_id.length=in->session_id_length;
138         a.session_id.type=V_ASN1_OCTET_STRING;
139         a.session_id.data=in->session_id;
140
141         a.session_id_context.length=in->sid_ctx_length;
142         a.session_id_context.type=V_ASN1_OCTET_STRING;
143         a.session_id_context.data=in->sid_ctx;
144
145         a.key_arg.length=in->key_arg_length;
146         a.key_arg.type=V_ASN1_OCTET_STRING;
147         a.key_arg.data=in->key_arg;
148
149 #ifndef OPENSSL_NO_KRB5
150         if (in->krb5_client_princ_len)
151                 {
152                 a.krb5_princ.length=in->krb5_client_princ_len;
153                 a.krb5_princ.type=V_ASN1_OCTET_STRING;
154                 a.krb5_princ.data=in->krb5_client_princ;
155                 }
156 #endif /* OPENSSL_NO_KRB5 */
157  
158         if (in->time != 0L)
159                 {
160                 a.time.length=LSIZE2;
161                 a.time.type=V_ASN1_INTEGER;
162                 a.time.data=ibuf3;
163                 ASN1_INTEGER_set(&(a.time),in->time);
164                 }
165
166         if (in->timeout != 0L)
167                 {
168                 a.timeout.length=LSIZE2;
169                 a.timeout.type=V_ASN1_INTEGER;
170                 a.timeout.data=ibuf4;
171                 ASN1_INTEGER_set(&(a.timeout),in->timeout);
172                 }
173
174         if (in->verify_result != X509_V_OK)
175                 {
176                 a.verify_result.length=LSIZE2;
177                 a.verify_result.type=V_ASN1_INTEGER;
178                 a.verify_result.data=ibuf5;
179                 ASN1_INTEGER_set(&a.verify_result,in->verify_result);
180                 }
181
182
183         M_ASN1_I2D_len(&(a.version),            i2d_ASN1_INTEGER);
184         M_ASN1_I2D_len(&(a.ssl_version),        i2d_ASN1_INTEGER);
185         M_ASN1_I2D_len(&(a.cipher),             i2d_ASN1_OCTET_STRING);
186         M_ASN1_I2D_len(&(a.session_id),         i2d_ASN1_OCTET_STRING);
187         M_ASN1_I2D_len(&(a.master_key),         i2d_ASN1_OCTET_STRING);
188 #ifndef OPENSSL_NO_KRB5
189         if (in->krb5_client_princ_len)
190                 M_ASN1_I2D_len(&(a.krb5_princ), i2d_ASN1_OCTET_STRING);
191 #endif /* OPENSSL_NO_KRB5 */
192         if (in->key_arg_length > 0)
193                 M_ASN1_I2D_len_IMP_opt(&(a.key_arg),i2d_ASN1_OCTET_STRING);
194         if (in->time != 0L)
195                 M_ASN1_I2D_len_EXP_opt(&(a.time),i2d_ASN1_INTEGER,1,v1);
196         if (in->timeout != 0L)
197                 M_ASN1_I2D_len_EXP_opt(&(a.timeout),i2d_ASN1_INTEGER,2,v2);
198         if (in->peer != NULL)
199                 M_ASN1_I2D_len_EXP_opt(in->peer,i2d_X509,3,v3);
200         M_ASN1_I2D_len_EXP_opt(&a.session_id_context,i2d_ASN1_OCTET_STRING,4,v4);
201         if (in->verify_result != X509_V_OK)
202                 M_ASN1_I2D_len_EXP_opt(&(a.verify_result),i2d_ASN1_INTEGER,5,v5);
203
204         M_ASN1_I2D_seq_total();
205
206         M_ASN1_I2D_put(&(a.version),            i2d_ASN1_INTEGER);
207         M_ASN1_I2D_put(&(a.ssl_version),        i2d_ASN1_INTEGER);
208         M_ASN1_I2D_put(&(a.cipher),             i2d_ASN1_OCTET_STRING);
209         M_ASN1_I2D_put(&(a.session_id),         i2d_ASN1_OCTET_STRING);
210         M_ASN1_I2D_put(&(a.master_key),         i2d_ASN1_OCTET_STRING);
211 #ifndef OPENSSL_NO_KRB5
212         if (in->krb5_client_princ_len)
213                 M_ASN1_I2D_put(&(a.krb5_princ), i2d_ASN1_OCTET_STRING);
214 #endif /* OPENSSL_NO_KRB5 */
215         if (in->key_arg_length > 0)
216                 M_ASN1_I2D_put_IMP_opt(&(a.key_arg),i2d_ASN1_OCTET_STRING,0);
217         if (in->time != 0L)
218                 M_ASN1_I2D_put_EXP_opt(&(a.time),i2d_ASN1_INTEGER,1,v1);
219         if (in->timeout != 0L)
220                 M_ASN1_I2D_put_EXP_opt(&(a.timeout),i2d_ASN1_INTEGER,2,v2);
221         if (in->peer != NULL)
222                 M_ASN1_I2D_put_EXP_opt(in->peer,i2d_X509,3,v3);
223         M_ASN1_I2D_put_EXP_opt(&a.session_id_context,i2d_ASN1_OCTET_STRING,4,
224                                v4);
225         if (in->verify_result != X509_V_OK)
226                 M_ASN1_I2D_put_EXP_opt(&a.verify_result,i2d_ASN1_INTEGER,5,v5);
227         M_ASN1_I2D_finish();
228         }
229
230 SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, unsigned char **pp,
231              long length)
232         {
233         int version,ssl_version=0,i;
234         long id;
235         ASN1_INTEGER ai,*aip;
236         ASN1_OCTET_STRING os,*osp;
237         M_ASN1_D2I_vars(a,SSL_SESSION *,SSL_SESSION_new);
238
239         aip= &ai;
240         osp= &os;
241
242         M_ASN1_D2I_Init();
243         M_ASN1_D2I_start_sequence();
244
245         ai.data=NULL; ai.length=0;
246         M_ASN1_D2I_get(aip,d2i_ASN1_INTEGER);
247         version=(int)ASN1_INTEGER_get(aip);
248         if (ai.data != NULL) { OPENSSL_free(ai.data); ai.data=NULL; ai.length=0; }
249
250         /* we don't care about the version right now :-) */
251         M_ASN1_D2I_get(aip,d2i_ASN1_INTEGER);
252         ssl_version=(int)ASN1_INTEGER_get(aip);
253         ret->ssl_version=ssl_version;
254         if (ai.data != NULL) { OPENSSL_free(ai.data); ai.data=NULL; ai.length=0; }
255
256         os.data=NULL; os.length=0;
257         M_ASN1_D2I_get(osp,d2i_ASN1_OCTET_STRING);
258         if (ssl_version == SSL2_VERSION)
259                 {
260                 if (os.length != 3)
261                         {
262                         c.error=SSL_R_CIPHER_CODE_WRONG_LENGTH;
263                         goto err;
264                         }
265                 id=0x02000000L|
266                         ((unsigned long)os.data[0]<<16L)|
267                         ((unsigned long)os.data[1]<< 8L)|
268                          (unsigned long)os.data[2];
269                 }
270         else if ((ssl_version>>8) == 3)
271                 {
272                 if (os.length != 2)
273                         {
274                         c.error=SSL_R_CIPHER_CODE_WRONG_LENGTH;
275                         goto err;
276                         }
277                 id=0x03000000L|
278                         ((unsigned long)os.data[0]<<8L)|
279                          (unsigned long)os.data[1];
280                 }
281         else
282                 {
283                 SSLerr(SSL_F_D2I_SSL_SESSION,SSL_R_UNKNOWN_SSL_VERSION);
284                 return(NULL);
285                 }
286         
287         ret->cipher=NULL;
288         ret->cipher_id=id;
289
290         M_ASN1_D2I_get(osp,d2i_ASN1_OCTET_STRING);
291         if ((ssl_version>>8) == SSL3_VERSION)
292                 i=SSL3_MAX_SSL_SESSION_ID_LENGTH;
293         else /* if (ssl_version == SSL2_VERSION) */
294                 i=SSL2_MAX_SSL_SESSION_ID_LENGTH;
295
296         if (os.length > i)
297                 os.length = i;
298         if (os.length > sizeof ret->session_id) /* can't happen */
299                 os.length = sizeof ret->session_id;
300
301         ret->session_id_length=os.length;
302         memcpy(ret->session_id,os.data,os.length);
303
304         M_ASN1_D2I_get(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=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                 SSLerr(SSL_F_D2I_SSL_SESSION,SSL_R_BAD_LENGTH);
374             ret->sid_ctx_length=os.length;
375             memcpy(ret->sid_ctx,os.data,os.length);
376             OPENSSL_free(os.data); os.data=NULL; os.length=0;
377             }
378         else
379             ret->sid_ctx_length=0;
380
381         ai.length=0;
382         M_ASN1_D2I_get_EXP_opt(aip,d2i_ASN1_INTEGER,5);
383         if (ai.data != NULL)
384                 {
385                 ret->verify_result=ASN1_INTEGER_get(aip);
386                 OPENSSL_free(ai.data); ai.data=NULL; ai.length=0;
387                 }
388         else
389                 ret->verify_result=X509_V_OK;
390
391         M_ASN1_D2I_Finish(a,SSL_SESSION_free,SSL_F_D2I_SSL_SESSION);
392         }