xref: /freebsd/crypto/openssl/ssl/ssl_ciph.c (revision 895f86f15fbf6540071feb9328c3c50ed1f027b8)
1 /* ssl/ssl_ciph.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  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer.
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111 /* ====================================================================
112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113  * ECC cipher suite support in OpenSSL originally developed by
114  * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
115  */
116 /* ====================================================================
117  * Copyright 2005 Nokia. All rights reserved.
118  *
119  * The portions of the attached software ("Contribution") is developed by
120  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
121  * license.
122  *
123  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
124  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
125  * support (see RFC 4279) to OpenSSL.
126  *
127  * No patent licenses or other rights except those expressly stated in
128  * the OpenSSL open source license shall be deemed granted or received
129  * expressly, by implication, estoppel, or otherwise.
130  *
131  * No assurances are provided by Nokia that the Contribution does not
132  * infringe the patent or other intellectual property rights of any third
133  * party or that the license provides you with all the necessary rights
134  * to make use of the Contribution.
135  *
136  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
137  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
138  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
139  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
140  * OTHERWISE.
141  */
142 
143 #include <stdio.h>
144 #include <openssl/objects.h>
145 #ifndef OPENSSL_NO_COMP
146 # include <openssl/comp.h>
147 #endif
148 #ifndef OPENSSL_NO_ENGINE
149 # include <openssl/engine.h>
150 #endif
151 #include "ssl_locl.h"
152 
153 #define SSL_ENC_DES_IDX         0
154 #define SSL_ENC_3DES_IDX        1
155 #define SSL_ENC_RC4_IDX         2
156 #define SSL_ENC_RC2_IDX         3
157 #define SSL_ENC_IDEA_IDX        4
158 #define SSL_ENC_NULL_IDX        5
159 #define SSL_ENC_AES128_IDX      6
160 #define SSL_ENC_AES256_IDX      7
161 #define SSL_ENC_CAMELLIA128_IDX 8
162 #define SSL_ENC_CAMELLIA256_IDX 9
163 #define SSL_ENC_GOST89_IDX      10
164 #define SSL_ENC_SEED_IDX        11
165 #define SSL_ENC_AES128GCM_IDX   12
166 #define SSL_ENC_AES256GCM_IDX   13
167 #define SSL_ENC_NUM_IDX         14
168 
169 static const EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX] = {
170     NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
171     NULL, NULL
172 };
173 
174 #define SSL_COMP_NULL_IDX       0
175 #define SSL_COMP_ZLIB_IDX       1
176 #define SSL_COMP_NUM_IDX        2
177 
178 static STACK_OF(SSL_COMP) *ssl_comp_methods = NULL;
179 
180 #define SSL_MD_MD5_IDX  0
181 #define SSL_MD_SHA1_IDX 1
182 #define SSL_MD_GOST94_IDX 2
183 #define SSL_MD_GOST89MAC_IDX 3
184 #define SSL_MD_SHA256_IDX 4
185 #define SSL_MD_SHA384_IDX 5
186 /*
187  * Constant SSL_MAX_DIGEST equal to size of digests array should be defined
188  * in the ssl_locl.h
189  */
190 #define SSL_MD_NUM_IDX  SSL_MAX_DIGEST
191 static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX] = {
192     NULL, NULL, NULL, NULL, NULL, NULL
193 };
194 
195 /*
196  * PKEY_TYPE for GOST89MAC is known in advance, but, because implementation
197  * is engine-provided, we'll fill it only if corresponding EVP_PKEY_METHOD is
198  * found
199  */
200 static int ssl_mac_pkey_id[SSL_MD_NUM_IDX] = {
201     EVP_PKEY_HMAC, EVP_PKEY_HMAC, EVP_PKEY_HMAC, NID_undef,
202     EVP_PKEY_HMAC, EVP_PKEY_HMAC
203 };
204 
205 static int ssl_mac_secret_size[SSL_MD_NUM_IDX] = {
206     0, 0, 0, 0, 0, 0
207 };
208 
209 static int ssl_handshake_digest_flag[SSL_MD_NUM_IDX] = {
210     SSL_HANDSHAKE_MAC_MD5, SSL_HANDSHAKE_MAC_SHA,
211     SSL_HANDSHAKE_MAC_GOST94, 0, SSL_HANDSHAKE_MAC_SHA256,
212     SSL_HANDSHAKE_MAC_SHA384
213 };
214 
215 #define CIPHER_ADD      1
216 #define CIPHER_KILL     2
217 #define CIPHER_DEL      3
218 #define CIPHER_ORD      4
219 #define CIPHER_SPECIAL  5
220 
221 typedef struct cipher_order_st {
222     const SSL_CIPHER *cipher;
223     int active;
224     int dead;
225     struct cipher_order_st *next, *prev;
226 } CIPHER_ORDER;
227 
228 static const SSL_CIPHER cipher_aliases[] = {
229     /* "ALL" doesn't include eNULL (must be specifically enabled) */
230     {0, SSL_TXT_ALL, 0, 0, 0, ~SSL_eNULL, 0, 0, 0, 0, 0, 0},
231     /* "COMPLEMENTOFALL" */
232     {0, SSL_TXT_CMPALL, 0, 0, 0, SSL_eNULL, 0, 0, 0, 0, 0, 0},
233 
234     /*
235      * "COMPLEMENTOFDEFAULT" (does *not* include ciphersuites not found in
236      * ALL!)
237      */
238     {0, SSL_TXT_CMPDEF, 0, 0, SSL_aNULL, ~SSL_eNULL, 0, ~SSL_SSLV2,
239      SSL_EXP_MASK, 0, 0, 0},
240 
241     /*
242      * key exchange aliases (some of those using only a single bit here
243      * combine multiple key exchange algs according to the RFCs, e.g. kEDH
244      * combines DHE_DSS and DHE_RSA)
245      */
246     {0, SSL_TXT_kRSA, 0, SSL_kRSA, 0, 0, 0, 0, 0, 0, 0, 0},
247 
248     {0, SSL_TXT_kDHr, 0, SSL_kDHr, 0, 0, 0, 0, 0, 0, 0, 0},
249     {0, SSL_TXT_kDHd, 0, SSL_kDHd, 0, 0, 0, 0, 0, 0, 0, 0},
250     {0, SSL_TXT_kDH, 0, SSL_kDHr | SSL_kDHd, 0, 0, 0, 0, 0, 0, 0, 0},
251     {0, SSL_TXT_kEDH, 0, SSL_kEDH, 0, 0, 0, 0, 0, 0, 0, 0},
252     {0, SSL_TXT_kDHE, 0, SSL_kEDH, 0, 0, 0, 0, 0, 0, 0, 0},
253     {0, SSL_TXT_DH, 0, SSL_kDHr | SSL_kDHd | SSL_kEDH, 0, 0, 0, 0, 0, 0, 0,
254      0},
255 
256     {0, SSL_TXT_kKRB5, 0, SSL_kKRB5, 0, 0, 0, 0, 0, 0, 0, 0},
257 
258     {0, SSL_TXT_kECDHr, 0, SSL_kECDHr, 0, 0, 0, 0, 0, 0, 0, 0},
259     {0, SSL_TXT_kECDHe, 0, SSL_kECDHe, 0, 0, 0, 0, 0, 0, 0, 0},
260     {0, SSL_TXT_kECDH, 0, SSL_kECDHr | SSL_kECDHe, 0, 0, 0, 0, 0, 0, 0, 0},
261     {0, SSL_TXT_kEECDH, 0, SSL_kEECDH, 0, 0, 0, 0, 0, 0, 0, 0},
262     {0, SSL_TXT_kECDHE, 0, SSL_kEECDH, 0, 0, 0, 0, 0, 0, 0, 0},
263     {0, SSL_TXT_ECDH, 0, SSL_kECDHr | SSL_kECDHe | SSL_kEECDH, 0, 0, 0, 0, 0,
264      0, 0, 0},
265 
266     {0, SSL_TXT_kPSK, 0, SSL_kPSK, 0, 0, 0, 0, 0, 0, 0, 0},
267     {0, SSL_TXT_kSRP, 0, SSL_kSRP, 0, 0, 0, 0, 0, 0, 0, 0},
268     {0, SSL_TXT_kGOST, 0, SSL_kGOST, 0, 0, 0, 0, 0, 0, 0, 0},
269 
270     /* server authentication aliases */
271     {0, SSL_TXT_aRSA, 0, 0, SSL_aRSA, 0, 0, 0, 0, 0, 0, 0},
272     {0, SSL_TXT_aDSS, 0, 0, SSL_aDSS, 0, 0, 0, 0, 0, 0, 0},
273     {0, SSL_TXT_DSS, 0, 0, SSL_aDSS, 0, 0, 0, 0, 0, 0, 0},
274     {0, SSL_TXT_aKRB5, 0, 0, SSL_aKRB5, 0, 0, 0, 0, 0, 0, 0},
275     {0, SSL_TXT_aNULL, 0, 0, SSL_aNULL, 0, 0, 0, 0, 0, 0, 0},
276     /* no such ciphersuites supported! */
277     {0, SSL_TXT_aDH, 0, 0, SSL_aDH, 0, 0, 0, 0, 0, 0, 0},
278     {0, SSL_TXT_aECDH, 0, 0, SSL_aECDH, 0, 0, 0, 0, 0, 0, 0},
279     {0, SSL_TXT_aECDSA, 0, 0, SSL_aECDSA, 0, 0, 0, 0, 0, 0, 0},
280     {0, SSL_TXT_ECDSA, 0, 0, SSL_aECDSA, 0, 0, 0, 0, 0, 0, 0},
281     {0, SSL_TXT_aPSK, 0, 0, SSL_aPSK, 0, 0, 0, 0, 0, 0, 0},
282     {0, SSL_TXT_aGOST94, 0, 0, SSL_aGOST94, 0, 0, 0, 0, 0, 0, 0},
283     {0, SSL_TXT_aGOST01, 0, 0, SSL_aGOST01, 0, 0, 0, 0, 0, 0, 0},
284     {0, SSL_TXT_aGOST, 0, 0, SSL_aGOST94 | SSL_aGOST01, 0, 0, 0, 0, 0, 0, 0},
285     {0, SSL_TXT_aSRP, 0, 0, SSL_aSRP, 0, 0, 0, 0, 0, 0, 0},
286 
287     /* aliases combining key exchange and server authentication */
288     {0, SSL_TXT_EDH, 0, SSL_kEDH, ~SSL_aNULL, 0, 0, 0, 0, 0, 0, 0},
289     {0, SSL_TXT_DHE, 0, SSL_kEDH, ~SSL_aNULL, 0, 0, 0, 0, 0, 0, 0},
290     {0, SSL_TXT_EECDH, 0, SSL_kEECDH, ~SSL_aNULL, 0, 0, 0, 0, 0, 0, 0},
291     {0, SSL_TXT_ECDHE, 0, SSL_kEECDH, ~SSL_aNULL, 0, 0, 0, 0, 0, 0, 0},
292     {0, SSL_TXT_NULL, 0, 0, 0, SSL_eNULL, 0, 0, 0, 0, 0, 0},
293     {0, SSL_TXT_KRB5, 0, SSL_kKRB5, SSL_aKRB5, 0, 0, 0, 0, 0, 0, 0},
294     {0, SSL_TXT_RSA, 0, SSL_kRSA, SSL_aRSA, 0, 0, 0, 0, 0, 0, 0},
295     {0, SSL_TXT_ADH, 0, SSL_kEDH, SSL_aNULL, 0, 0, 0, 0, 0, 0, 0},
296     {0, SSL_TXT_AECDH, 0, SSL_kEECDH, SSL_aNULL, 0, 0, 0, 0, 0, 0, 0},
297     {0, SSL_TXT_PSK, 0, SSL_kPSK, SSL_aPSK, 0, 0, 0, 0, 0, 0, 0},
298     {0, SSL_TXT_SRP, 0, SSL_kSRP, 0, 0, 0, 0, 0, 0, 0, 0},
299 
300     /* symmetric encryption aliases */
301     {0, SSL_TXT_DES, 0, 0, 0, SSL_DES, 0, 0, 0, 0, 0, 0},
302     {0, SSL_TXT_3DES, 0, 0, 0, SSL_3DES, 0, 0, 0, 0, 0, 0},
303     {0, SSL_TXT_RC4, 0, 0, 0, SSL_RC4, 0, 0, 0, 0, 0, 0},
304     {0, SSL_TXT_RC2, 0, 0, 0, SSL_RC2, 0, 0, 0, 0, 0, 0},
305     {0, SSL_TXT_IDEA, 0, 0, 0, SSL_IDEA, 0, 0, 0, 0, 0, 0},
306     {0, SSL_TXT_SEED, 0, 0, 0, SSL_SEED, 0, 0, 0, 0, 0, 0},
307     {0, SSL_TXT_eNULL, 0, 0, 0, SSL_eNULL, 0, 0, 0, 0, 0, 0},
308     {0, SSL_TXT_AES128, 0, 0, 0, SSL_AES128 | SSL_AES128GCM, 0, 0, 0, 0, 0,
309      0},
310     {0, SSL_TXT_AES256, 0, 0, 0, SSL_AES256 | SSL_AES256GCM, 0, 0, 0, 0, 0,
311      0},
312     {0, SSL_TXT_AES, 0, 0, 0, SSL_AES, 0, 0, 0, 0, 0, 0},
313     {0, SSL_TXT_AES_GCM, 0, 0, 0, SSL_AES128GCM | SSL_AES256GCM, 0, 0, 0, 0,
314      0, 0},
315     {0, SSL_TXT_CAMELLIA128, 0, 0, 0, SSL_CAMELLIA128, 0, 0, 0, 0, 0, 0},
316     {0, SSL_TXT_CAMELLIA256, 0, 0, 0, SSL_CAMELLIA256, 0, 0, 0, 0, 0, 0},
317     {0, SSL_TXT_CAMELLIA, 0, 0, 0, SSL_CAMELLIA128 | SSL_CAMELLIA256, 0, 0, 0,
318      0, 0, 0},
319 
320     /* MAC aliases */
321     {0, SSL_TXT_MD5, 0, 0, 0, 0, SSL_MD5, 0, 0, 0, 0, 0},
322     {0, SSL_TXT_SHA1, 0, 0, 0, 0, SSL_SHA1, 0, 0, 0, 0, 0},
323     {0, SSL_TXT_SHA, 0, 0, 0, 0, SSL_SHA1, 0, 0, 0, 0, 0},
324     {0, SSL_TXT_GOST94, 0, 0, 0, 0, SSL_GOST94, 0, 0, 0, 0, 0},
325     {0, SSL_TXT_GOST89MAC, 0, 0, 0, 0, SSL_GOST89MAC, 0, 0, 0, 0, 0},
326     {0, SSL_TXT_SHA256, 0, 0, 0, 0, SSL_SHA256, 0, 0, 0, 0, 0},
327     {0, SSL_TXT_SHA384, 0, 0, 0, 0, SSL_SHA384, 0, 0, 0, 0, 0},
328 
329     /* protocol version aliases */
330     {0, SSL_TXT_SSLV2, 0, 0, 0, 0, 0, SSL_SSLV2, 0, 0, 0, 0},
331     {0, SSL_TXT_SSLV3, 0, 0, 0, 0, 0, SSL_SSLV3, 0, 0, 0, 0},
332     {0, SSL_TXT_TLSV1, 0, 0, 0, 0, 0, SSL_TLSV1, 0, 0, 0, 0},
333     {0, SSL_TXT_TLSV1_2, 0, 0, 0, 0, 0, SSL_TLSV1_2, 0, 0, 0, 0},
334 
335     /* export flag */
336     {0, SSL_TXT_EXP, 0, 0, 0, 0, 0, 0, SSL_EXPORT, 0, 0, 0},
337     {0, SSL_TXT_EXPORT, 0, 0, 0, 0, 0, 0, SSL_EXPORT, 0, 0, 0},
338 
339     /* strength classes */
340     {0, SSL_TXT_EXP40, 0, 0, 0, 0, 0, 0, SSL_EXP40, 0, 0, 0},
341     {0, SSL_TXT_EXP56, 0, 0, 0, 0, 0, 0, SSL_EXP56, 0, 0, 0},
342     {0, SSL_TXT_LOW, 0, 0, 0, 0, 0, 0, SSL_LOW, 0, 0, 0},
343     {0, SSL_TXT_MEDIUM, 0, 0, 0, 0, 0, 0, SSL_MEDIUM, 0, 0, 0},
344     {0, SSL_TXT_HIGH, 0, 0, 0, 0, 0, 0, SSL_HIGH, 0, 0, 0},
345     /* FIPS 140-2 approved ciphersuite */
346     {0, SSL_TXT_FIPS, 0, 0, 0, ~SSL_eNULL, 0, 0, SSL_FIPS, 0, 0, 0},
347     /* "DHE-" aliases to "EDH-" labels (for forward compatibility) */
348     {0, SSL3_TXT_DHE_DSS_DES_40_CBC_SHA, 0,
349      SSL_kDHE, SSL_aDSS, SSL_DES, SSL_SHA1, SSL_SSLV3, SSL_EXPORT | SSL_EXP40,
350      0, 0, 0,},
351     {0, SSL3_TXT_DHE_DSS_DES_64_CBC_SHA, 0,
352      SSL_kDHE, SSL_aDSS, SSL_DES, SSL_SHA1, SSL_SSLV3, SSL_NOT_EXP | SSL_LOW,
353      0, 0, 0,},
354     {0, SSL3_TXT_DHE_DSS_DES_192_CBC3_SHA, 0,
355      SSL_kDHE, SSL_aDSS, SSL_3DES, SSL_SHA1, SSL_SSLV3,
356      SSL_NOT_EXP | SSL_HIGH | SSL_FIPS, 0, 0, 0,},
357     {0, SSL3_TXT_DHE_RSA_DES_40_CBC_SHA, 0,
358      SSL_kDHE, SSL_aRSA, SSL_DES, SSL_SHA1, SSL_SSLV3, SSL_EXPORT | SSL_EXP40,
359      0, 0, 0,},
360     {0, SSL3_TXT_DHE_RSA_DES_64_CBC_SHA, 0,
361      SSL_kDHE, SSL_aRSA, SSL_DES, SSL_SHA1, SSL_SSLV3, SSL_NOT_EXP | SSL_LOW,
362      0, 0, 0,},
363     {0, SSL3_TXT_DHE_RSA_DES_192_CBC3_SHA, 0,
364      SSL_kDHE, SSL_aRSA, SSL_3DES, SSL_SHA1, SSL_SSLV3,
365      SSL_NOT_EXP | SSL_HIGH | SSL_FIPS, 0, 0, 0,},
366 };
367 
368 /*
369  * Search for public key algorithm with given name and return its pkey_id if
370  * it is available. Otherwise return 0
371  */
372 #ifdef OPENSSL_NO_ENGINE
373 
374 static int get_optional_pkey_id(const char *pkey_name)
375 {
376     const EVP_PKEY_ASN1_METHOD *ameth;
377     int pkey_id = 0;
378     ameth = EVP_PKEY_asn1_find_str(NULL, pkey_name, -1);
379     if (ameth) {
380         EVP_PKEY_asn1_get0_info(&pkey_id, NULL, NULL, NULL, NULL, ameth);
381     }
382     return pkey_id;
383 }
384 
385 #else
386 
387 static int get_optional_pkey_id(const char *pkey_name)
388 {
389     const EVP_PKEY_ASN1_METHOD *ameth;
390     ENGINE *tmpeng = NULL;
391     int pkey_id = 0;
392     ameth = EVP_PKEY_asn1_find_str(&tmpeng, pkey_name, -1);
393     if (ameth) {
394         EVP_PKEY_asn1_get0_info(&pkey_id, NULL, NULL, NULL, NULL, ameth);
395     }
396     if (tmpeng)
397         ENGINE_finish(tmpeng);
398     return pkey_id;
399 }
400 
401 #endif
402 
403 void ssl_load_ciphers(void)
404 {
405     ssl_cipher_methods[SSL_ENC_DES_IDX] = EVP_get_cipherbyname(SN_des_cbc);
406     ssl_cipher_methods[SSL_ENC_3DES_IDX] =
407         EVP_get_cipherbyname(SN_des_ede3_cbc);
408     ssl_cipher_methods[SSL_ENC_RC4_IDX] = EVP_get_cipherbyname(SN_rc4);
409     ssl_cipher_methods[SSL_ENC_RC2_IDX] = EVP_get_cipherbyname(SN_rc2_cbc);
410 #ifndef OPENSSL_NO_IDEA
411     ssl_cipher_methods[SSL_ENC_IDEA_IDX] = EVP_get_cipherbyname(SN_idea_cbc);
412 #else
413     ssl_cipher_methods[SSL_ENC_IDEA_IDX] = NULL;
414 #endif
415     ssl_cipher_methods[SSL_ENC_AES128_IDX] =
416         EVP_get_cipherbyname(SN_aes_128_cbc);
417     ssl_cipher_methods[SSL_ENC_AES256_IDX] =
418         EVP_get_cipherbyname(SN_aes_256_cbc);
419     ssl_cipher_methods[SSL_ENC_CAMELLIA128_IDX] =
420         EVP_get_cipherbyname(SN_camellia_128_cbc);
421     ssl_cipher_methods[SSL_ENC_CAMELLIA256_IDX] =
422         EVP_get_cipherbyname(SN_camellia_256_cbc);
423     ssl_cipher_methods[SSL_ENC_GOST89_IDX] =
424         EVP_get_cipherbyname(SN_gost89_cnt);
425     ssl_cipher_methods[SSL_ENC_SEED_IDX] = EVP_get_cipherbyname(SN_seed_cbc);
426 
427     ssl_cipher_methods[SSL_ENC_AES128GCM_IDX] =
428         EVP_get_cipherbyname(SN_aes_128_gcm);
429     ssl_cipher_methods[SSL_ENC_AES256GCM_IDX] =
430         EVP_get_cipherbyname(SN_aes_256_gcm);
431 
432     ssl_digest_methods[SSL_MD_MD5_IDX] = EVP_get_digestbyname(SN_md5);
433     ssl_mac_secret_size[SSL_MD_MD5_IDX] =
434         EVP_MD_size(ssl_digest_methods[SSL_MD_MD5_IDX]);
435     OPENSSL_assert(ssl_mac_secret_size[SSL_MD_MD5_IDX] >= 0);
436     ssl_digest_methods[SSL_MD_SHA1_IDX] = EVP_get_digestbyname(SN_sha1);
437     ssl_mac_secret_size[SSL_MD_SHA1_IDX] =
438         EVP_MD_size(ssl_digest_methods[SSL_MD_SHA1_IDX]);
439     OPENSSL_assert(ssl_mac_secret_size[SSL_MD_SHA1_IDX] >= 0);
440     ssl_digest_methods[SSL_MD_GOST94_IDX] =
441         EVP_get_digestbyname(SN_id_GostR3411_94);
442     if (ssl_digest_methods[SSL_MD_GOST94_IDX]) {
443         ssl_mac_secret_size[SSL_MD_GOST94_IDX] =
444             EVP_MD_size(ssl_digest_methods[SSL_MD_GOST94_IDX]);
445         OPENSSL_assert(ssl_mac_secret_size[SSL_MD_GOST94_IDX] >= 0);
446     }
447     ssl_digest_methods[SSL_MD_GOST89MAC_IDX] =
448         EVP_get_digestbyname(SN_id_Gost28147_89_MAC);
449     ssl_mac_pkey_id[SSL_MD_GOST89MAC_IDX] = get_optional_pkey_id("gost-mac");
450     if (ssl_mac_pkey_id[SSL_MD_GOST89MAC_IDX]) {
451         ssl_mac_secret_size[SSL_MD_GOST89MAC_IDX] = 32;
452     }
453 
454     ssl_digest_methods[SSL_MD_SHA256_IDX] = EVP_get_digestbyname(SN_sha256);
455     ssl_mac_secret_size[SSL_MD_SHA256_IDX] =
456         EVP_MD_size(ssl_digest_methods[SSL_MD_SHA256_IDX]);
457     ssl_digest_methods[SSL_MD_SHA384_IDX] = EVP_get_digestbyname(SN_sha384);
458     ssl_mac_secret_size[SSL_MD_SHA384_IDX] =
459         EVP_MD_size(ssl_digest_methods[SSL_MD_SHA384_IDX]);
460 }
461 
462 #ifndef OPENSSL_NO_COMP
463 
464 static int sk_comp_cmp(const SSL_COMP *const *a, const SSL_COMP *const *b)
465 {
466     return ((*a)->id - (*b)->id);
467 }
468 
469 static void load_builtin_compressions(void)
470 {
471     int got_write_lock = 0;
472 
473     CRYPTO_r_lock(CRYPTO_LOCK_SSL);
474     if (ssl_comp_methods == NULL) {
475         CRYPTO_r_unlock(CRYPTO_LOCK_SSL);
476         CRYPTO_w_lock(CRYPTO_LOCK_SSL);
477         got_write_lock = 1;
478 
479         if (ssl_comp_methods == NULL) {
480             SSL_COMP *comp = NULL;
481 
482             MemCheck_off();
483             ssl_comp_methods = sk_SSL_COMP_new(sk_comp_cmp);
484             if (ssl_comp_methods != NULL) {
485                 comp = (SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
486                 if (comp != NULL) {
487                     comp->method = COMP_zlib();
488                     if (comp->method && comp->method->type == NID_undef)
489                         OPENSSL_free(comp);
490                     else {
491                         comp->id = SSL_COMP_ZLIB_IDX;
492                         comp->name = comp->method->name;
493                         sk_SSL_COMP_push(ssl_comp_methods, comp);
494                     }
495                 }
496                 sk_SSL_COMP_sort(ssl_comp_methods);
497             }
498             MemCheck_on();
499         }
500     }
501 
502     if (got_write_lock)
503         CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
504     else
505         CRYPTO_r_unlock(CRYPTO_LOCK_SSL);
506 }
507 #endif
508 
509 int ssl_cipher_get_evp(const SSL_SESSION *s, const EVP_CIPHER **enc,
510                        const EVP_MD **md, int *mac_pkey_type,
511                        int *mac_secret_size, SSL_COMP **comp)
512 {
513     int i;
514     const SSL_CIPHER *c;
515 
516     c = s->cipher;
517     if (c == NULL)
518         return (0);
519     if (comp != NULL) {
520         SSL_COMP ctmp;
521 #ifndef OPENSSL_NO_COMP
522         load_builtin_compressions();
523 #endif
524 
525         *comp = NULL;
526         ctmp.id = s->compress_meth;
527         if (ssl_comp_methods != NULL) {
528             i = sk_SSL_COMP_find(ssl_comp_methods, &ctmp);
529             if (i >= 0)
530                 *comp = sk_SSL_COMP_value(ssl_comp_methods, i);
531             else
532                 *comp = NULL;
533         }
534     }
535 
536     if ((enc == NULL) || (md == NULL))
537         return (0);
538 
539     switch (c->algorithm_enc) {
540     case SSL_DES:
541         i = SSL_ENC_DES_IDX;
542         break;
543     case SSL_3DES:
544         i = SSL_ENC_3DES_IDX;
545         break;
546     case SSL_RC4:
547         i = SSL_ENC_RC4_IDX;
548         break;
549     case SSL_RC2:
550         i = SSL_ENC_RC2_IDX;
551         break;
552     case SSL_IDEA:
553         i = SSL_ENC_IDEA_IDX;
554         break;
555     case SSL_eNULL:
556         i = SSL_ENC_NULL_IDX;
557         break;
558     case SSL_AES128:
559         i = SSL_ENC_AES128_IDX;
560         break;
561     case SSL_AES256:
562         i = SSL_ENC_AES256_IDX;
563         break;
564     case SSL_CAMELLIA128:
565         i = SSL_ENC_CAMELLIA128_IDX;
566         break;
567     case SSL_CAMELLIA256:
568         i = SSL_ENC_CAMELLIA256_IDX;
569         break;
570     case SSL_eGOST2814789CNT:
571         i = SSL_ENC_GOST89_IDX;
572         break;
573     case SSL_SEED:
574         i = SSL_ENC_SEED_IDX;
575         break;
576     case SSL_AES128GCM:
577         i = SSL_ENC_AES128GCM_IDX;
578         break;
579     case SSL_AES256GCM:
580         i = SSL_ENC_AES256GCM_IDX;
581         break;
582     default:
583         i = -1;
584         break;
585     }
586 
587     if ((i < 0) || (i >= SSL_ENC_NUM_IDX))
588         *enc = NULL;
589     else {
590         if (i == SSL_ENC_NULL_IDX)
591             *enc = EVP_enc_null();
592         else
593             *enc = ssl_cipher_methods[i];
594     }
595 
596     switch (c->algorithm_mac) {
597     case SSL_MD5:
598         i = SSL_MD_MD5_IDX;
599         break;
600     case SSL_SHA1:
601         i = SSL_MD_SHA1_IDX;
602         break;
603     case SSL_SHA256:
604         i = SSL_MD_SHA256_IDX;
605         break;
606     case SSL_SHA384:
607         i = SSL_MD_SHA384_IDX;
608         break;
609     case SSL_GOST94:
610         i = SSL_MD_GOST94_IDX;
611         break;
612     case SSL_GOST89MAC:
613         i = SSL_MD_GOST89MAC_IDX;
614         break;
615     default:
616         i = -1;
617         break;
618     }
619     if ((i < 0) || (i >= SSL_MD_NUM_IDX)) {
620         *md = NULL;
621         if (mac_pkey_type != NULL)
622             *mac_pkey_type = NID_undef;
623         if (mac_secret_size != NULL)
624             *mac_secret_size = 0;
625         if (c->algorithm_mac == SSL_AEAD)
626             mac_pkey_type = NULL;
627     } else {
628         *md = ssl_digest_methods[i];
629         if (mac_pkey_type != NULL)
630             *mac_pkey_type = ssl_mac_pkey_id[i];
631         if (mac_secret_size != NULL)
632             *mac_secret_size = ssl_mac_secret_size[i];
633     }
634 
635     if ((*enc != NULL) &&
636         (*md != NULL || (EVP_CIPHER_flags(*enc) & EVP_CIPH_FLAG_AEAD_CIPHER))
637         && (!mac_pkey_type || *mac_pkey_type != NID_undef)) {
638         const EVP_CIPHER *evp;
639 
640         if (s->ssl_version >> 8 != TLS1_VERSION_MAJOR ||
641             s->ssl_version < TLS1_VERSION)
642             return 1;
643 
644 #ifdef OPENSSL_FIPS
645         if (FIPS_mode())
646             return 1;
647 #endif
648 
649         if (c->algorithm_enc == SSL_RC4 &&
650             c->algorithm_mac == SSL_MD5 &&
651             (evp = EVP_get_cipherbyname("RC4-HMAC-MD5")))
652             *enc = evp, *md = NULL;
653         else if (c->algorithm_enc == SSL_AES128 &&
654                  c->algorithm_mac == SSL_SHA1 &&
655                  (evp = EVP_get_cipherbyname("AES-128-CBC-HMAC-SHA1")))
656             *enc = evp, *md = NULL;
657         else if (c->algorithm_enc == SSL_AES256 &&
658                  c->algorithm_mac == SSL_SHA1 &&
659                  (evp = EVP_get_cipherbyname("AES-256-CBC-HMAC-SHA1")))
660             *enc = evp, *md = NULL;
661         else if (c->algorithm_enc == SSL_AES128 &&
662                  c->algorithm_mac == SSL_SHA256 &&
663                  (evp = EVP_get_cipherbyname("AES-128-CBC-HMAC-SHA256")))
664             *enc = evp, *md = NULL;
665         else if (c->algorithm_enc == SSL_AES256 &&
666                  c->algorithm_mac == SSL_SHA256 &&
667                  (evp = EVP_get_cipherbyname("AES-256-CBC-HMAC-SHA256")))
668             *enc = evp, *md = NULL;
669         return (1);
670     } else
671         return (0);
672 }
673 
674 int ssl_get_handshake_digest(int idx, long *mask, const EVP_MD **md)
675 {
676     if (idx < 0 || idx >= SSL_MD_NUM_IDX) {
677         return 0;
678     }
679     *mask = ssl_handshake_digest_flag[idx];
680     if (*mask)
681         *md = ssl_digest_methods[idx];
682     else
683         *md = NULL;
684     return 1;
685 }
686 
687 #define ITEM_SEP(a) \
688         (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))
689 
690 static void ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr,
691                            CIPHER_ORDER **tail)
692 {
693     if (curr == *tail)
694         return;
695     if (curr == *head)
696         *head = curr->next;
697     if (curr->prev != NULL)
698         curr->prev->next = curr->next;
699     if (curr->next != NULL)
700         curr->next->prev = curr->prev;
701     (*tail)->next = curr;
702     curr->prev = *tail;
703     curr->next = NULL;
704     *tail = curr;
705 }
706 
707 static void ll_append_head(CIPHER_ORDER **head, CIPHER_ORDER *curr,
708                            CIPHER_ORDER **tail)
709 {
710     if (curr == *head)
711         return;
712     if (curr == *tail)
713         *tail = curr->prev;
714     if (curr->next != NULL)
715         curr->next->prev = curr->prev;
716     if (curr->prev != NULL)
717         curr->prev->next = curr->next;
718     (*head)->prev = curr;
719     curr->next = *head;
720     curr->prev = NULL;
721     *head = curr;
722 }
723 
724 static void ssl_cipher_get_disabled(unsigned long *mkey, unsigned long *auth,
725                                     unsigned long *enc, unsigned long *mac,
726                                     unsigned long *ssl)
727 {
728     *mkey = 0;
729     *auth = 0;
730     *enc = 0;
731     *mac = 0;
732     *ssl = 0;
733 
734 #ifdef OPENSSL_NO_RSA
735     *mkey |= SSL_kRSA;
736     *auth |= SSL_aRSA;
737 #endif
738 #ifdef OPENSSL_NO_DSA
739     *auth |= SSL_aDSS;
740 #endif
741 #ifdef OPENSSL_NO_DH
742     *mkey |= SSL_kDHr | SSL_kDHd | SSL_kEDH;
743     *auth |= SSL_aDH;
744 #endif
745 #ifdef OPENSSL_NO_KRB5
746     *mkey |= SSL_kKRB5;
747     *auth |= SSL_aKRB5;
748 #endif
749 #ifdef OPENSSL_NO_ECDSA
750     *auth |= SSL_aECDSA;
751 #endif
752 #ifdef OPENSSL_NO_ECDH
753     *mkey |= SSL_kECDHe | SSL_kECDHr;
754     *auth |= SSL_aECDH;
755 #endif
756 #ifdef OPENSSL_NO_PSK
757     *mkey |= SSL_kPSK;
758     *auth |= SSL_aPSK;
759 #endif
760 #ifdef OPENSSL_NO_SRP
761     *mkey |= SSL_kSRP;
762 #endif
763     /*
764      * Check for presence of GOST 34.10 algorithms, and if they do not
765      * present, disable appropriate auth and key exchange
766      */
767     if (!get_optional_pkey_id("gost94")) {
768         *auth |= SSL_aGOST94;
769     }
770     if (!get_optional_pkey_id("gost2001")) {
771         *auth |= SSL_aGOST01;
772     }
773     /*
774      * Disable GOST key exchange if no GOST signature algs are available *
775      */
776     if ((*auth & (SSL_aGOST94 | SSL_aGOST01)) == (SSL_aGOST94 | SSL_aGOST01)) {
777         *mkey |= SSL_kGOST;
778     }
779 #ifdef SSL_FORBID_ENULL
780     *enc |= SSL_eNULL;
781 #endif
782 
783     *enc |= (ssl_cipher_methods[SSL_ENC_DES_IDX] == NULL) ? SSL_DES : 0;
784     *enc |= (ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL) ? SSL_3DES : 0;
785     *enc |= (ssl_cipher_methods[SSL_ENC_RC4_IDX] == NULL) ? SSL_RC4 : 0;
786     *enc |= (ssl_cipher_methods[SSL_ENC_RC2_IDX] == NULL) ? SSL_RC2 : 0;
787     *enc |= (ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL) ? SSL_IDEA : 0;
788     *enc |= (ssl_cipher_methods[SSL_ENC_AES128_IDX] == NULL) ? SSL_AES128 : 0;
789     *enc |= (ssl_cipher_methods[SSL_ENC_AES256_IDX] == NULL) ? SSL_AES256 : 0;
790     *enc |=
791         (ssl_cipher_methods[SSL_ENC_AES128GCM_IDX] ==
792          NULL) ? SSL_AES128GCM : 0;
793     *enc |=
794         (ssl_cipher_methods[SSL_ENC_AES256GCM_IDX] ==
795          NULL) ? SSL_AES256GCM : 0;
796     *enc |=
797         (ssl_cipher_methods[SSL_ENC_CAMELLIA128_IDX] ==
798          NULL) ? SSL_CAMELLIA128 : 0;
799     *enc |=
800         (ssl_cipher_methods[SSL_ENC_CAMELLIA256_IDX] ==
801          NULL) ? SSL_CAMELLIA256 : 0;
802     *enc |=
803         (ssl_cipher_methods[SSL_ENC_GOST89_IDX] ==
804          NULL) ? SSL_eGOST2814789CNT : 0;
805     *enc |= (ssl_cipher_methods[SSL_ENC_SEED_IDX] == NULL) ? SSL_SEED : 0;
806 
807     *mac |= (ssl_digest_methods[SSL_MD_MD5_IDX] == NULL) ? SSL_MD5 : 0;
808     *mac |= (ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL) ? SSL_SHA1 : 0;
809     *mac |= (ssl_digest_methods[SSL_MD_SHA256_IDX] == NULL) ? SSL_SHA256 : 0;
810     *mac |= (ssl_digest_methods[SSL_MD_SHA384_IDX] == NULL) ? SSL_SHA384 : 0;
811     *mac |= (ssl_digest_methods[SSL_MD_GOST94_IDX] == NULL) ? SSL_GOST94 : 0;
812     *mac |= (ssl_digest_methods[SSL_MD_GOST89MAC_IDX] == NULL
813              || ssl_mac_pkey_id[SSL_MD_GOST89MAC_IDX] ==
814              NID_undef) ? SSL_GOST89MAC : 0;
815 
816 }
817 
818 static void ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method,
819                                        int num_of_ciphers,
820                                        unsigned long disabled_mkey,
821                                        unsigned long disabled_auth,
822                                        unsigned long disabled_enc,
823                                        unsigned long disabled_mac,
824                                        unsigned long disabled_ssl,
825                                        CIPHER_ORDER *co_list,
826                                        CIPHER_ORDER **head_p,
827                                        CIPHER_ORDER **tail_p)
828 {
829     int i, co_list_num;
830     const SSL_CIPHER *c;
831 
832     /*
833      * We have num_of_ciphers descriptions compiled in, depending on the
834      * method selected (SSLv2 and/or SSLv3, TLSv1 etc).
835      * These will later be sorted in a linked list with at most num
836      * entries.
837      */
838 
839     /* Get the initial list of ciphers */
840     co_list_num = 0;            /* actual count of ciphers */
841     for (i = 0; i < num_of_ciphers; i++) {
842         c = ssl_method->get_cipher(i);
843         /* drop those that use any of that is not available */
844         if ((c != NULL) && c->valid &&
845 #ifdef OPENSSL_FIPS
846             (!FIPS_mode() || (c->algo_strength & SSL_FIPS)) &&
847 #endif
848             !(c->algorithm_mkey & disabled_mkey) &&
849             !(c->algorithm_auth & disabled_auth) &&
850             !(c->algorithm_enc & disabled_enc) &&
851             !(c->algorithm_mac & disabled_mac) &&
852             !(c->algorithm_ssl & disabled_ssl)) {
853             co_list[co_list_num].cipher = c;
854             co_list[co_list_num].next = NULL;
855             co_list[co_list_num].prev = NULL;
856             co_list[co_list_num].active = 0;
857             co_list_num++;
858 #ifdef KSSL_DEBUG
859             fprintf(stderr, "\t%d: %s %lx %lx %lx\n", i, c->name, c->id,
860                     c->algorithm_mkey, c->algorithm_auth);
861 #endif                          /* KSSL_DEBUG */
862             /*
863              * if (!sk_push(ca_list,(char *)c)) goto err;
864              */
865         }
866     }
867 
868     /*
869      * Prepare linked list from list entries
870      */
871     if (co_list_num > 0) {
872         co_list[0].prev = NULL;
873 
874         if (co_list_num > 1) {
875             co_list[0].next = &co_list[1];
876 
877             for (i = 1; i < co_list_num - 1; i++) {
878                 co_list[i].prev = &co_list[i - 1];
879                 co_list[i].next = &co_list[i + 1];
880             }
881 
882             co_list[co_list_num - 1].prev = &co_list[co_list_num - 2];
883         }
884 
885         co_list[co_list_num - 1].next = NULL;
886 
887         *head_p = &co_list[0];
888         *tail_p = &co_list[co_list_num - 1];
889     }
890 }
891 
892 static void ssl_cipher_collect_aliases(const SSL_CIPHER **ca_list,
893                                        int num_of_group_aliases,
894                                        unsigned long disabled_mkey,
895                                        unsigned long disabled_auth,
896                                        unsigned long disabled_enc,
897                                        unsigned long disabled_mac,
898                                        unsigned long disabled_ssl,
899                                        CIPHER_ORDER *head)
900 {
901     CIPHER_ORDER *ciph_curr;
902     const SSL_CIPHER **ca_curr;
903     int i;
904     unsigned long mask_mkey = ~disabled_mkey;
905     unsigned long mask_auth = ~disabled_auth;
906     unsigned long mask_enc = ~disabled_enc;
907     unsigned long mask_mac = ~disabled_mac;
908     unsigned long mask_ssl = ~disabled_ssl;
909 
910     /*
911      * First, add the real ciphers as already collected
912      */
913     ciph_curr = head;
914     ca_curr = ca_list;
915     while (ciph_curr != NULL) {
916         *ca_curr = ciph_curr->cipher;
917         ca_curr++;
918         ciph_curr = ciph_curr->next;
919     }
920 
921     /*
922      * Now we add the available ones from the cipher_aliases[] table.
923      * They represent either one or more algorithms, some of which
924      * in any affected category must be supported (set in enabled_mask),
925      * or represent a cipher strength value (will be added in any case because algorithms=0).
926      */
927     for (i = 0; i < num_of_group_aliases; i++) {
928         unsigned long algorithm_mkey = cipher_aliases[i].algorithm_mkey;
929         unsigned long algorithm_auth = cipher_aliases[i].algorithm_auth;
930         unsigned long algorithm_enc = cipher_aliases[i].algorithm_enc;
931         unsigned long algorithm_mac = cipher_aliases[i].algorithm_mac;
932         unsigned long algorithm_ssl = cipher_aliases[i].algorithm_ssl;
933 
934         if (algorithm_mkey)
935             if ((algorithm_mkey & mask_mkey) == 0)
936                 continue;
937 
938         if (algorithm_auth)
939             if ((algorithm_auth & mask_auth) == 0)
940                 continue;
941 
942         if (algorithm_enc)
943             if ((algorithm_enc & mask_enc) == 0)
944                 continue;
945 
946         if (algorithm_mac)
947             if ((algorithm_mac & mask_mac) == 0)
948                 continue;
949 
950         if (algorithm_ssl)
951             if ((algorithm_ssl & mask_ssl) == 0)
952                 continue;
953 
954         *ca_curr = (SSL_CIPHER *)(cipher_aliases + i);
955         ca_curr++;
956     }
957 
958     *ca_curr = NULL;            /* end of list */
959 }
960 
961 static void ssl_cipher_apply_rule(unsigned long cipher_id,
962                                   unsigned long alg_mkey,
963                                   unsigned long alg_auth,
964                                   unsigned long alg_enc,
965                                   unsigned long alg_mac,
966                                   unsigned long alg_ssl,
967                                   unsigned long algo_strength, int rule,
968                                   int strength_bits, CIPHER_ORDER **head_p,
969                                   CIPHER_ORDER **tail_p)
970 {
971     CIPHER_ORDER *head, *tail, *curr, *next, *last;
972     const SSL_CIPHER *cp;
973     int reverse = 0;
974 
975 #ifdef CIPHER_DEBUG
976     fprintf(stderr,
977             "Applying rule %d with %08lx/%08lx/%08lx/%08lx/%08lx %08lx (%d)\n",
978             rule, alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl,
979             algo_strength, strength_bits);
980 #endif
981 
982     if (rule == CIPHER_DEL)
983         reverse = 1;            /* needed to maintain sorting between
984                                  * currently deleted ciphers */
985 
986     head = *head_p;
987     tail = *tail_p;
988 
989     if (reverse) {
990         next = tail;
991         last = head;
992     } else {
993         next = head;
994         last = tail;
995     }
996 
997     curr = NULL;
998     for (;;) {
999         if (curr == last)
1000             break;
1001 
1002         curr = next;
1003 
1004         if (curr == NULL)
1005             break;
1006 
1007         next = reverse ? curr->prev : curr->next;
1008 
1009         cp = curr->cipher;
1010 
1011         /*
1012          * Selection criteria is either the value of strength_bits
1013          * or the algorithms used.
1014          */
1015         if (strength_bits >= 0) {
1016             if (strength_bits != cp->strength_bits)
1017                 continue;
1018         } else {
1019 #ifdef CIPHER_DEBUG
1020             fprintf(stderr,
1021                     "\nName: %s:\nAlgo = %08lx/%08lx/%08lx/%08lx/%08lx Algo_strength = %08lx\n",
1022                     cp->name, cp->algorithm_mkey, cp->algorithm_auth,
1023                     cp->algorithm_enc, cp->algorithm_mac, cp->algorithm_ssl,
1024                     cp->algo_strength);
1025 #endif
1026 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
1027             if (cipher_id && cipher_id != cp->id)
1028                 continue;
1029 #endif
1030             if (algo_strength == SSL_EXP_MASK && SSL_C_IS_EXPORT(cp))
1031                 goto ok;
1032             if (alg_ssl == ~SSL_SSLV2 && cp->algorithm_ssl == SSL_SSLV2)
1033                 goto ok;
1034             if (alg_mkey && !(alg_mkey & cp->algorithm_mkey))
1035                 continue;
1036             if (alg_auth && !(alg_auth & cp->algorithm_auth))
1037                 continue;
1038             if (alg_enc && !(alg_enc & cp->algorithm_enc))
1039                 continue;
1040             if (alg_mac && !(alg_mac & cp->algorithm_mac))
1041                 continue;
1042             if (alg_ssl && !(alg_ssl & cp->algorithm_ssl))
1043                 continue;
1044             if ((algo_strength & SSL_EXP_MASK)
1045                 && !(algo_strength & SSL_EXP_MASK & cp->algo_strength))
1046                 continue;
1047             if ((algo_strength & SSL_STRONG_MASK)
1048                 && !(algo_strength & SSL_STRONG_MASK & cp->algo_strength))
1049                 continue;
1050         }
1051 
1052     ok:
1053 
1054 #ifdef CIPHER_DEBUG
1055         fprintf(stderr, "Action = %d\n", rule);
1056 #endif
1057 
1058         /* add the cipher if it has not been added yet. */
1059         if (rule == CIPHER_ADD) {
1060             /* reverse == 0 */
1061             if (!curr->active) {
1062                 ll_append_tail(&head, curr, &tail);
1063                 curr->active = 1;
1064             }
1065         }
1066         /* Move the added cipher to this location */
1067         else if (rule == CIPHER_ORD) {
1068             /* reverse == 0 */
1069             if (curr->active) {
1070                 ll_append_tail(&head, curr, &tail);
1071             }
1072         } else if (rule == CIPHER_DEL) {
1073             /* reverse == 1 */
1074             if (curr->active) {
1075                 /*
1076                  * most recently deleted ciphersuites get best positions for
1077                  * any future CIPHER_ADD (note that the CIPHER_DEL loop works
1078                  * in reverse to maintain the order)
1079                  */
1080                 ll_append_head(&head, curr, &tail);
1081                 curr->active = 0;
1082             }
1083         } else if (rule == CIPHER_KILL) {
1084             /* reverse == 0 */
1085             if (head == curr)
1086                 head = curr->next;
1087             else
1088                 curr->prev->next = curr->next;
1089             if (tail == curr)
1090                 tail = curr->prev;
1091             curr->active = 0;
1092             if (curr->next != NULL)
1093                 curr->next->prev = curr->prev;
1094             if (curr->prev != NULL)
1095                 curr->prev->next = curr->next;
1096             curr->next = NULL;
1097             curr->prev = NULL;
1098         }
1099     }
1100 
1101     *head_p = head;
1102     *tail_p = tail;
1103 }
1104 
1105 static int ssl_cipher_strength_sort(CIPHER_ORDER **head_p,
1106                                     CIPHER_ORDER **tail_p)
1107 {
1108     int max_strength_bits, i, *number_uses;
1109     CIPHER_ORDER *curr;
1110 
1111     /*
1112      * This routine sorts the ciphers with descending strength. The sorting
1113      * must keep the pre-sorted sequence, so we apply the normal sorting
1114      * routine as '+' movement to the end of the list.
1115      */
1116     max_strength_bits = 0;
1117     curr = *head_p;
1118     while (curr != NULL) {
1119         if (curr->active && (curr->cipher->strength_bits > max_strength_bits))
1120             max_strength_bits = curr->cipher->strength_bits;
1121         curr = curr->next;
1122     }
1123 
1124     number_uses = OPENSSL_malloc((max_strength_bits + 1) * sizeof(int));
1125     if (!number_uses) {
1126         SSLerr(SSL_F_SSL_CIPHER_STRENGTH_SORT, ERR_R_MALLOC_FAILURE);
1127         return (0);
1128     }
1129     memset(number_uses, 0, (max_strength_bits + 1) * sizeof(int));
1130 
1131     /*
1132      * Now find the strength_bits values actually used
1133      */
1134     curr = *head_p;
1135     while (curr != NULL) {
1136         if (curr->active)
1137             number_uses[curr->cipher->strength_bits]++;
1138         curr = curr->next;
1139     }
1140     /*
1141      * Go through the list of used strength_bits values in descending
1142      * order.
1143      */
1144     for (i = max_strength_bits; i >= 0; i--)
1145         if (number_uses[i] > 0)
1146             ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ORD, i, head_p,
1147                                   tail_p);
1148 
1149     OPENSSL_free(number_uses);
1150     return (1);
1151 }
1152 
1153 static int ssl_cipher_process_rulestr(const char *rule_str,
1154                                       CIPHER_ORDER **head_p,
1155                                       CIPHER_ORDER **tail_p,
1156                                       const SSL_CIPHER **ca_list)
1157 {
1158     unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl,
1159         algo_strength;
1160     const char *l, *buf;
1161     int j, multi, found, rule, retval, ok, buflen;
1162     unsigned long cipher_id = 0;
1163     char ch;
1164 
1165     retval = 1;
1166     l = rule_str;
1167     for (;;) {
1168         ch = *l;
1169 
1170         if (ch == '\0')
1171             break;              /* done */
1172         if (ch == '-') {
1173             rule = CIPHER_DEL;
1174             l++;
1175         } else if (ch == '+') {
1176             rule = CIPHER_ORD;
1177             l++;
1178         } else if (ch == '!') {
1179             rule = CIPHER_KILL;
1180             l++;
1181         } else if (ch == '@') {
1182             rule = CIPHER_SPECIAL;
1183             l++;
1184         } else {
1185             rule = CIPHER_ADD;
1186         }
1187 
1188         if (ITEM_SEP(ch)) {
1189             l++;
1190             continue;
1191         }
1192 
1193         alg_mkey = 0;
1194         alg_auth = 0;
1195         alg_enc = 0;
1196         alg_mac = 0;
1197         alg_ssl = 0;
1198         algo_strength = 0;
1199 
1200         for (;;) {
1201             ch = *l;
1202             buf = l;
1203             buflen = 0;
1204 #ifndef CHARSET_EBCDIC
1205             while (((ch >= 'A') && (ch <= 'Z')) ||
1206                    ((ch >= '0') && (ch <= '9')) ||
1207                    ((ch >= 'a') && (ch <= 'z')) || (ch == '-') || (ch == '.'))
1208 #else
1209             while (isalnum(ch) || (ch == '-') || (ch == '.'))
1210 #endif
1211             {
1212                 ch = *(++l);
1213                 buflen++;
1214             }
1215 
1216             if (buflen == 0) {
1217                 /*
1218                  * We hit something we cannot deal with,
1219                  * it is no command or separator nor
1220                  * alphanumeric, so we call this an error.
1221                  */
1222                 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
1223                        SSL_R_INVALID_COMMAND);
1224                 retval = found = 0;
1225                 l++;
1226                 break;
1227             }
1228 
1229             if (rule == CIPHER_SPECIAL) {
1230                 found = 0;      /* unused -- avoid compiler warning */
1231                 break;          /* special treatment */
1232             }
1233 
1234             /* check for multi-part specification */
1235             if (ch == '+') {
1236                 multi = 1;
1237                 l++;
1238             } else
1239                 multi = 0;
1240 
1241             /*
1242              * Now search for the cipher alias in the ca_list. Be careful
1243              * with the strncmp, because the "buflen" limitation
1244              * will make the rule "ADH:SOME" and the cipher
1245              * "ADH-MY-CIPHER" look like a match for buflen=3.
1246              * So additionally check whether the cipher name found
1247              * has the correct length. We can save a strlen() call:
1248              * just checking for the '\0' at the right place is
1249              * sufficient, we have to strncmp() anyway. (We cannot
1250              * use strcmp(), because buf is not '\0' terminated.)
1251              */
1252             j = found = 0;
1253             cipher_id = 0;
1254             while (ca_list[j]) {
1255                 if (!strncmp(buf, ca_list[j]->name, buflen) &&
1256                     (ca_list[j]->name[buflen] == '\0')) {
1257                     found = 1;
1258                     break;
1259                 } else
1260                     j++;
1261             }
1262 
1263             if (!found)
1264                 break;          /* ignore this entry */
1265 
1266             if (ca_list[j]->algorithm_mkey) {
1267                 if (alg_mkey) {
1268                     alg_mkey &= ca_list[j]->algorithm_mkey;
1269                     if (!alg_mkey) {
1270                         found = 0;
1271                         break;
1272                     }
1273                 } else
1274                     alg_mkey = ca_list[j]->algorithm_mkey;
1275             }
1276 
1277             if (ca_list[j]->algorithm_auth) {
1278                 if (alg_auth) {
1279                     alg_auth &= ca_list[j]->algorithm_auth;
1280                     if (!alg_auth) {
1281                         found = 0;
1282                         break;
1283                     }
1284                 } else
1285                     alg_auth = ca_list[j]->algorithm_auth;
1286             }
1287 
1288             if (ca_list[j]->algorithm_enc) {
1289                 if (alg_enc) {
1290                     alg_enc &= ca_list[j]->algorithm_enc;
1291                     if (!alg_enc) {
1292                         found = 0;
1293                         break;
1294                     }
1295                 } else
1296                     alg_enc = ca_list[j]->algorithm_enc;
1297             }
1298 
1299             if (ca_list[j]->algorithm_mac) {
1300                 if (alg_mac) {
1301                     alg_mac &= ca_list[j]->algorithm_mac;
1302                     if (!alg_mac) {
1303                         found = 0;
1304                         break;
1305                     }
1306                 } else
1307                     alg_mac = ca_list[j]->algorithm_mac;
1308             }
1309 
1310             if (ca_list[j]->algo_strength & SSL_EXP_MASK) {
1311                 if (algo_strength & SSL_EXP_MASK) {
1312                     algo_strength &=
1313                         (ca_list[j]->algo_strength & SSL_EXP_MASK) |
1314                         ~SSL_EXP_MASK;
1315                     if (!(algo_strength & SSL_EXP_MASK)) {
1316                         found = 0;
1317                         break;
1318                     }
1319                 } else
1320                     algo_strength |= ca_list[j]->algo_strength & SSL_EXP_MASK;
1321             }
1322 
1323             if (ca_list[j]->algo_strength & SSL_STRONG_MASK) {
1324                 if (algo_strength & SSL_STRONG_MASK) {
1325                     algo_strength &=
1326                         (ca_list[j]->algo_strength & SSL_STRONG_MASK) |
1327                         ~SSL_STRONG_MASK;
1328                     if (!(algo_strength & SSL_STRONG_MASK)) {
1329                         found = 0;
1330                         break;
1331                     }
1332                 } else
1333                     algo_strength |=
1334                         ca_list[j]->algo_strength & SSL_STRONG_MASK;
1335             }
1336 
1337             if (ca_list[j]->valid) {
1338                 /*
1339                  * explicit ciphersuite found; its protocol version does not
1340                  * become part of the search pattern!
1341                  */
1342 
1343                 cipher_id = ca_list[j]->id;
1344             } else {
1345                 /*
1346                  * not an explicit ciphersuite; only in this case, the
1347                  * protocol version is considered part of the search pattern
1348                  */
1349 
1350                 if (ca_list[j]->algorithm_ssl) {
1351                     if (alg_ssl) {
1352                         alg_ssl &= ca_list[j]->algorithm_ssl;
1353                         if (!alg_ssl) {
1354                             found = 0;
1355                             break;
1356                         }
1357                     } else
1358                         alg_ssl = ca_list[j]->algorithm_ssl;
1359                 }
1360             }
1361 
1362             if (!multi)
1363                 break;
1364         }
1365 
1366         /*
1367          * Ok, we have the rule, now apply it
1368          */
1369         if (rule == CIPHER_SPECIAL) { /* special command */
1370             ok = 0;
1371             if ((buflen == 8) && !strncmp(buf, "STRENGTH", 8))
1372                 ok = ssl_cipher_strength_sort(head_p, tail_p);
1373             else
1374                 SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
1375                        SSL_R_INVALID_COMMAND);
1376             if (ok == 0)
1377                 retval = 0;
1378             /*
1379              * We do not support any "multi" options
1380              * together with "@", so throw away the
1381              * rest of the command, if any left, until
1382              * end or ':' is found.
1383              */
1384             while ((*l != '\0') && !ITEM_SEP(*l))
1385                 l++;
1386         } else if (found) {
1387             ssl_cipher_apply_rule(cipher_id,
1388                                   alg_mkey, alg_auth, alg_enc, alg_mac,
1389                                   alg_ssl, algo_strength, rule, -1, head_p,
1390                                   tail_p);
1391         } else {
1392             while ((*l != '\0') && !ITEM_SEP(*l))
1393                 l++;
1394         }
1395         if (*l == '\0')
1396             break;              /* done */
1397     }
1398 
1399     return (retval);
1400 }
1401 
1402 #ifndef OPENSSL_NO_EC
1403 static int check_suiteb_cipher_list(const SSL_METHOD *meth, CERT *c,
1404                                     const char **prule_str)
1405 {
1406     unsigned int suiteb_flags = 0, suiteb_comb2 = 0;
1407     if (!strcmp(*prule_str, "SUITEB128"))
1408         suiteb_flags = SSL_CERT_FLAG_SUITEB_128_LOS;
1409     else if (!strcmp(*prule_str, "SUITEB128ONLY"))
1410         suiteb_flags = SSL_CERT_FLAG_SUITEB_128_LOS_ONLY;
1411     else if (!strcmp(*prule_str, "SUITEB128C2")) {
1412         suiteb_comb2 = 1;
1413         suiteb_flags = SSL_CERT_FLAG_SUITEB_128_LOS;
1414     } else if (!strcmp(*prule_str, "SUITEB192"))
1415         suiteb_flags = SSL_CERT_FLAG_SUITEB_192_LOS;
1416 
1417     if (suiteb_flags) {
1418         c->cert_flags &= ~SSL_CERT_FLAG_SUITEB_128_LOS;
1419         c->cert_flags |= suiteb_flags;
1420     } else
1421         suiteb_flags = c->cert_flags & SSL_CERT_FLAG_SUITEB_128_LOS;
1422 
1423     if (!suiteb_flags)
1424         return 1;
1425     /* Check version: if TLS 1.2 ciphers allowed we can use Suite B */
1426 
1427     if (!(meth->ssl3_enc->enc_flags & SSL_ENC_FLAG_TLS1_2_CIPHERS)) {
1428         if (meth->ssl3_enc->enc_flags & SSL_ENC_FLAG_DTLS)
1429             SSLerr(SSL_F_CHECK_SUITEB_CIPHER_LIST,
1430                    SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
1431         else
1432             SSLerr(SSL_F_CHECK_SUITEB_CIPHER_LIST,
1433                    SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
1434         return 0;
1435     }
1436 # ifndef OPENSSL_NO_ECDH
1437     switch (suiteb_flags) {
1438     case SSL_CERT_FLAG_SUITEB_128_LOS:
1439         if (suiteb_comb2)
1440             *prule_str = "ECDHE-ECDSA-AES256-GCM-SHA384";
1441         else
1442             *prule_str =
1443                 "ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384";
1444         break;
1445     case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
1446         *prule_str = "ECDHE-ECDSA-AES128-GCM-SHA256";
1447         break;
1448     case SSL_CERT_FLAG_SUITEB_192_LOS:
1449         *prule_str = "ECDHE-ECDSA-AES256-GCM-SHA384";
1450         break;
1451     }
1452     /* Set auto ECDH parameter determination */
1453     c->ecdh_tmp_auto = 1;
1454     return 1;
1455 # else
1456     SSLerr(SSL_F_CHECK_SUITEB_CIPHER_LIST,
1457            SSL_R_ECDH_REQUIRED_FOR_SUITEB_MODE);
1458     return 0;
1459 # endif
1460 }
1461 #endif
1462 
1463 STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method, STACK_OF(SSL_CIPHER)
1464                                              **cipher_list, STACK_OF(SSL_CIPHER)
1465                                              **cipher_list_by_id,
1466                                              const char *rule_str, CERT *c)
1467 {
1468     int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases;
1469     unsigned long disabled_mkey, disabled_auth, disabled_enc, disabled_mac,
1470         disabled_ssl;
1471     STACK_OF(SSL_CIPHER) *cipherstack, *tmp_cipher_list;
1472     const char *rule_p;
1473     CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr;
1474     const SSL_CIPHER **ca_list = NULL;
1475 
1476     /*
1477      * Return with error if nothing to do.
1478      */
1479     if (rule_str == NULL || cipher_list == NULL || cipher_list_by_id == NULL)
1480         return NULL;
1481 #ifndef OPENSSL_NO_EC
1482     if (!check_suiteb_cipher_list(ssl_method, c, &rule_str))
1483         return NULL;
1484 #endif
1485 
1486     /*
1487      * To reduce the work to do we only want to process the compiled
1488      * in algorithms, so we first get the mask of disabled ciphers.
1489      */
1490     ssl_cipher_get_disabled(&disabled_mkey, &disabled_auth, &disabled_enc,
1491                             &disabled_mac, &disabled_ssl);
1492 
1493     /*
1494      * Now we have to collect the available ciphers from the compiled
1495      * in ciphers. We cannot get more than the number compiled in, so
1496      * it is used for allocation.
1497      */
1498     num_of_ciphers = ssl_method->num_ciphers();
1499 #ifdef KSSL_DEBUG
1500     fprintf(stderr, "ssl_create_cipher_list() for %d ciphers\n",
1501             num_of_ciphers);
1502 #endif                          /* KSSL_DEBUG */
1503     co_list =
1504         (CIPHER_ORDER *)OPENSSL_malloc(sizeof(CIPHER_ORDER) * num_of_ciphers);
1505     if (co_list == NULL) {
1506         SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
1507         return (NULL);          /* Failure */
1508     }
1509 
1510     ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers,
1511                                disabled_mkey, disabled_auth, disabled_enc,
1512                                disabled_mac, disabled_ssl, co_list, &head,
1513                                &tail);
1514 
1515     /* Now arrange all ciphers by preference: */
1516 
1517     /*
1518      * Everything else being equal, prefer ephemeral ECDH over other key
1519      * exchange mechanisms
1520      */
1521     ssl_cipher_apply_rule(0, SSL_kEECDH, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head,
1522                           &tail);
1523     ssl_cipher_apply_rule(0, SSL_kEECDH, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head,
1524                           &tail);
1525 
1526     /* AES is our preferred symmetric cipher */
1527     ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0, CIPHER_ADD, -1, &head,
1528                           &tail);
1529 
1530     /* Temporarily enable everything else for sorting */
1531     ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
1532 
1533     /* Low priority for MD5 */
1534     ssl_cipher_apply_rule(0, 0, 0, 0, SSL_MD5, 0, 0, CIPHER_ORD, -1, &head,
1535                           &tail);
1536 
1537     /*
1538      * Move anonymous ciphers to the end.  Usually, these will remain
1539      * disabled. (For applications that allow them, they aren't too bad, but
1540      * we prefer authenticated ciphers.)
1541      */
1542     ssl_cipher_apply_rule(0, 0, SSL_aNULL, 0, 0, 0, 0, CIPHER_ORD, -1, &head,
1543                           &tail);
1544 
1545     /* Move ciphers without forward secrecy to the end */
1546     ssl_cipher_apply_rule(0, 0, SSL_aECDH, 0, 0, 0, 0, CIPHER_ORD, -1, &head,
1547                           &tail);
1548     /*
1549      * ssl_cipher_apply_rule(0, 0, SSL_aDH, 0, 0, 0, 0, CIPHER_ORD, -1,
1550      * &head, &tail);
1551      */
1552     ssl_cipher_apply_rule(0, SSL_kRSA, 0, 0, 0, 0, 0, CIPHER_ORD, -1, &head,
1553                           &tail);
1554     ssl_cipher_apply_rule(0, SSL_kPSK, 0, 0, 0, 0, 0, CIPHER_ORD, -1, &head,
1555                           &tail);
1556     ssl_cipher_apply_rule(0, SSL_kKRB5, 0, 0, 0, 0, 0, CIPHER_ORD, -1, &head,
1557                           &tail);
1558 
1559     /* RC4 is sort-of broken -- move the the end */
1560     ssl_cipher_apply_rule(0, 0, 0, SSL_RC4, 0, 0, 0, CIPHER_ORD, -1, &head,
1561                           &tail);
1562 
1563     /*
1564      * Now sort by symmetric encryption strength.  The above ordering remains
1565      * in force within each class
1566      */
1567     if (!ssl_cipher_strength_sort(&head, &tail)) {
1568         OPENSSL_free(co_list);
1569         return NULL;
1570     }
1571 
1572     /* Now disable everything (maintaining the ordering!) */
1573     ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail);
1574 
1575     /*
1576      * We also need cipher aliases for selecting based on the rule_str.
1577      * There might be two types of entries in the rule_str: 1) names
1578      * of ciphers themselves 2) aliases for groups of ciphers.
1579      * For 1) we need the available ciphers and for 2) the cipher
1580      * groups of cipher_aliases added together in one list (otherwise
1581      * we would be happy with just the cipher_aliases table).
1582      */
1583     num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER);
1584     num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1;
1585     ca_list = OPENSSL_malloc(sizeof(SSL_CIPHER *) * num_of_alias_max);
1586     if (ca_list == NULL) {
1587         OPENSSL_free(co_list);
1588         SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
1589         return (NULL);          /* Failure */
1590     }
1591     ssl_cipher_collect_aliases(ca_list, num_of_group_aliases,
1592                                disabled_mkey, disabled_auth, disabled_enc,
1593                                disabled_mac, disabled_ssl, head);
1594 
1595     /*
1596      * If the rule_string begins with DEFAULT, apply the default rule
1597      * before using the (possibly available) additional rules.
1598      */
1599     ok = 1;
1600     rule_p = rule_str;
1601     if (strncmp(rule_str, "DEFAULT", 7) == 0) {
1602         ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST,
1603                                         &head, &tail, ca_list);
1604         rule_p += 7;
1605         if (*rule_p == ':')
1606             rule_p++;
1607     }
1608 
1609     if (ok && (strlen(rule_p) > 0))
1610         ok = ssl_cipher_process_rulestr(rule_p, &head, &tail, ca_list);
1611 
1612     OPENSSL_free((void *)ca_list); /* Not needed anymore */
1613 
1614     if (!ok) {                  /* Rule processing failure */
1615         OPENSSL_free(co_list);
1616         return (NULL);
1617     }
1618 
1619     /*
1620      * Allocate new "cipherstack" for the result, return with error
1621      * if we cannot get one.
1622      */
1623     if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL) {
1624         OPENSSL_free(co_list);
1625         return (NULL);
1626     }
1627 
1628     /*
1629      * The cipher selection for the list is done. The ciphers are added
1630      * to the resulting precedence to the STACK_OF(SSL_CIPHER).
1631      */
1632     for (curr = head; curr != NULL; curr = curr->next) {
1633 #ifdef OPENSSL_FIPS
1634         if (curr->active
1635             && (!FIPS_mode() || curr->cipher->algo_strength & SSL_FIPS))
1636 #else
1637         if (curr->active)
1638 #endif
1639         {
1640             sk_SSL_CIPHER_push(cipherstack, curr->cipher);
1641 #ifdef CIPHER_DEBUG
1642             fprintf(stderr, "<%s>\n", curr->cipher->name);
1643 #endif
1644         }
1645     }
1646     OPENSSL_free(co_list);      /* Not needed any longer */
1647 
1648     tmp_cipher_list = sk_SSL_CIPHER_dup(cipherstack);
1649     if (tmp_cipher_list == NULL) {
1650         sk_SSL_CIPHER_free(cipherstack);
1651         return NULL;
1652     }
1653     if (*cipher_list != NULL)
1654         sk_SSL_CIPHER_free(*cipher_list);
1655     *cipher_list = cipherstack;
1656     if (*cipher_list_by_id != NULL)
1657         sk_SSL_CIPHER_free(*cipher_list_by_id);
1658     *cipher_list_by_id = tmp_cipher_list;
1659     (void)sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id,
1660                                      ssl_cipher_ptr_id_cmp);
1661 
1662     sk_SSL_CIPHER_sort(*cipher_list_by_id);
1663     return (cipherstack);
1664 }
1665 
1666 char *SSL_CIPHER_description(const SSL_CIPHER *cipher, char *buf, int len)
1667 {
1668     int is_export, pkl, kl;
1669     const char *ver, *exp_str;
1670     const char *kx, *au, *enc, *mac;
1671     unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, alg2;
1672 #ifdef KSSL_DEBUG
1673     static const char *format =
1674         "%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s AL=%lx/%lx/%lx/%lx/%lx\n";
1675 #else
1676     static const char *format =
1677         "%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n";
1678 #endif                          /* KSSL_DEBUG */
1679 
1680     alg_mkey = cipher->algorithm_mkey;
1681     alg_auth = cipher->algorithm_auth;
1682     alg_enc = cipher->algorithm_enc;
1683     alg_mac = cipher->algorithm_mac;
1684     alg_ssl = cipher->algorithm_ssl;
1685 
1686     alg2 = cipher->algorithm2;
1687 
1688     is_export = SSL_C_IS_EXPORT(cipher);
1689     pkl = SSL_C_EXPORT_PKEYLENGTH(cipher);
1690     kl = SSL_C_EXPORT_KEYLENGTH(cipher);
1691     exp_str = is_export ? " export" : "";
1692 
1693     if (alg_ssl & SSL_SSLV2)
1694         ver = "SSLv2";
1695     else if (alg_ssl & SSL_SSLV3)
1696         ver = "SSLv3";
1697     else if (alg_ssl & SSL_TLSV1_2)
1698         ver = "TLSv1.2";
1699     else
1700         ver = "unknown";
1701 
1702     switch (alg_mkey) {
1703     case SSL_kRSA:
1704         kx = is_export ? (pkl == 512 ? "RSA(512)" : "RSA(1024)") : "RSA";
1705         break;
1706     case SSL_kDHr:
1707         kx = "DH/RSA";
1708         break;
1709     case SSL_kDHd:
1710         kx = "DH/DSS";
1711         break;
1712     case SSL_kKRB5:
1713         kx = "KRB5";
1714         break;
1715     case SSL_kEDH:
1716         kx = is_export ? (pkl == 512 ? "DH(512)" : "DH(1024)") : "DH";
1717         break;
1718     case SSL_kECDHr:
1719         kx = "ECDH/RSA";
1720         break;
1721     case SSL_kECDHe:
1722         kx = "ECDH/ECDSA";
1723         break;
1724     case SSL_kEECDH:
1725         kx = "ECDH";
1726         break;
1727     case SSL_kPSK:
1728         kx = "PSK";
1729         break;
1730     case SSL_kSRP:
1731         kx = "SRP";
1732         break;
1733     case SSL_kGOST:
1734         kx = "GOST";
1735         break;
1736     default:
1737         kx = "unknown";
1738     }
1739 
1740     switch (alg_auth) {
1741     case SSL_aRSA:
1742         au = "RSA";
1743         break;
1744     case SSL_aDSS:
1745         au = "DSS";
1746         break;
1747     case SSL_aDH:
1748         au = "DH";
1749         break;
1750     case SSL_aKRB5:
1751         au = "KRB5";
1752         break;
1753     case SSL_aECDH:
1754         au = "ECDH";
1755         break;
1756     case SSL_aNULL:
1757         au = "None";
1758         break;
1759     case SSL_aECDSA:
1760         au = "ECDSA";
1761         break;
1762     case SSL_aPSK:
1763         au = "PSK";
1764         break;
1765     case SSL_aSRP:
1766         au = "SRP";
1767         break;
1768     case SSL_aGOST94:
1769         au = "GOST94";
1770         break;
1771     case SSL_aGOST01:
1772         au = "GOST01";
1773         break;
1774     default:
1775         au = "unknown";
1776         break;
1777     }
1778 
1779     switch (alg_enc) {
1780     case SSL_DES:
1781         enc = (is_export && kl == 5) ? "DES(40)" : "DES(56)";
1782         break;
1783     case SSL_3DES:
1784         enc = "3DES(168)";
1785         break;
1786     case SSL_RC4:
1787         enc = is_export ? (kl == 5 ? "RC4(40)" : "RC4(56)")
1788             : ((alg2 & SSL2_CF_8_BYTE_ENC) ? "RC4(64)" : "RC4(128)");
1789         break;
1790     case SSL_RC2:
1791         enc = is_export ? (kl == 5 ? "RC2(40)" : "RC2(56)") : "RC2(128)";
1792         break;
1793     case SSL_IDEA:
1794         enc = "IDEA(128)";
1795         break;
1796     case SSL_eNULL:
1797         enc = "None";
1798         break;
1799     case SSL_AES128:
1800         enc = "AES(128)";
1801         break;
1802     case SSL_AES256:
1803         enc = "AES(256)";
1804         break;
1805     case SSL_AES128GCM:
1806         enc = "AESGCM(128)";
1807         break;
1808     case SSL_AES256GCM:
1809         enc = "AESGCM(256)";
1810         break;
1811     case SSL_CAMELLIA128:
1812         enc = "Camellia(128)";
1813         break;
1814     case SSL_CAMELLIA256:
1815         enc = "Camellia(256)";
1816         break;
1817     case SSL_SEED:
1818         enc = "SEED(128)";
1819         break;
1820     case SSL_eGOST2814789CNT:
1821         enc = "GOST89(256)";
1822         break;
1823     default:
1824         enc = "unknown";
1825         break;
1826     }
1827 
1828     switch (alg_mac) {
1829     case SSL_MD5:
1830         mac = "MD5";
1831         break;
1832     case SSL_SHA1:
1833         mac = "SHA1";
1834         break;
1835     case SSL_SHA256:
1836         mac = "SHA256";
1837         break;
1838     case SSL_SHA384:
1839         mac = "SHA384";
1840         break;
1841     case SSL_AEAD:
1842         mac = "AEAD";
1843         break;
1844     case SSL_GOST89MAC:
1845         mac = "GOST89";
1846         break;
1847     case SSL_GOST94:
1848         mac = "GOST94";
1849         break;
1850     default:
1851         mac = "unknown";
1852         break;
1853     }
1854 
1855     if (buf == NULL) {
1856         len = 128;
1857         buf = OPENSSL_malloc(len);
1858         if (buf == NULL)
1859             return ("OPENSSL_malloc Error");
1860     } else if (len < 128)
1861         return ("Buffer too small");
1862 
1863 #ifdef KSSL_DEBUG
1864     BIO_snprintf(buf, len, format, cipher->name, ver, kx, au, enc, mac,
1865                  exp_str, alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl);
1866 #else
1867     BIO_snprintf(buf, len, format, cipher->name, ver, kx, au, enc, mac,
1868                  exp_str);
1869 #endif                          /* KSSL_DEBUG */
1870     return (buf);
1871 }
1872 
1873 char *SSL_CIPHER_get_version(const SSL_CIPHER *c)
1874 {
1875     int i;
1876 
1877     if (c == NULL)
1878         return ("(NONE)");
1879     i = (int)(c->id >> 24L);
1880     if (i == 3)
1881         return ("TLSv1/SSLv3");
1882     else if (i == 2)
1883         return ("SSLv2");
1884     else
1885         return ("unknown");
1886 }
1887 
1888 /* return the actual cipher being used */
1889 const char *SSL_CIPHER_get_name(const SSL_CIPHER *c)
1890 {
1891     if (c != NULL)
1892         return (c->name);
1893     return ("(NONE)");
1894 }
1895 
1896 /* number of bits for symmetric cipher */
1897 int SSL_CIPHER_get_bits(const SSL_CIPHER *c, int *alg_bits)
1898 {
1899     int ret = 0;
1900 
1901     if (c != NULL) {
1902         if (alg_bits != NULL)
1903             *alg_bits = c->alg_bits;
1904         ret = c->strength_bits;
1905     }
1906     return (ret);
1907 }
1908 
1909 unsigned long SSL_CIPHER_get_id(const SSL_CIPHER *c)
1910 {
1911     return c->id;
1912 }
1913 
1914 SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n)
1915 {
1916     SSL_COMP *ctmp;
1917     int i, nn;
1918 
1919     if ((n == 0) || (sk == NULL))
1920         return (NULL);
1921     nn = sk_SSL_COMP_num(sk);
1922     for (i = 0; i < nn; i++) {
1923         ctmp = sk_SSL_COMP_value(sk, i);
1924         if (ctmp->id == n)
1925             return (ctmp);
1926     }
1927     return (NULL);
1928 }
1929 
1930 #ifdef OPENSSL_NO_COMP
1931 void *SSL_COMP_get_compression_methods(void)
1932 {
1933     return NULL;
1934 }
1935 
1936 int SSL_COMP_add_compression_method(int id, void *cm)
1937 {
1938     return 1;
1939 }
1940 
1941 const char *SSL_COMP_get_name(const void *comp)
1942 {
1943     return NULL;
1944 }
1945 #else
1946 STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void)
1947 {
1948     load_builtin_compressions();
1949     return (ssl_comp_methods);
1950 }
1951 
1952 STACK_OF(SSL_COMP) *SSL_COMP_set0_compression_methods(STACK_OF(SSL_COMP)
1953                                                       *meths)
1954 {
1955     STACK_OF(SSL_COMP) *old_meths = ssl_comp_methods;
1956     ssl_comp_methods = meths;
1957     return old_meths;
1958 }
1959 
1960 static void cmeth_free(SSL_COMP *cm)
1961 {
1962     OPENSSL_free(cm);
1963 }
1964 
1965 void SSL_COMP_free_compression_methods(void)
1966 {
1967     STACK_OF(SSL_COMP) *old_meths = ssl_comp_methods;
1968     ssl_comp_methods = NULL;
1969     sk_SSL_COMP_pop_free(old_meths, cmeth_free);
1970 }
1971 
1972 int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm)
1973 {
1974     SSL_COMP *comp;
1975 
1976     if (cm == NULL || cm->type == NID_undef)
1977         return 1;
1978 
1979     /*-
1980      * According to draft-ietf-tls-compression-04.txt, the
1981      * compression number ranges should be the following:
1982      *
1983      *   0 to  63:  methods defined by the IETF
1984      *  64 to 192:  external party methods assigned by IANA
1985      * 193 to 255:  reserved for private use
1986      */
1987     if (id < 193 || id > 255) {
1988         SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,
1989                SSL_R_COMPRESSION_ID_NOT_WITHIN_PRIVATE_RANGE);
1990         return 0;
1991     }
1992 
1993     MemCheck_off();
1994     comp = (SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
1995     comp->id = id;
1996     comp->method = cm;
1997     load_builtin_compressions();
1998     if (ssl_comp_methods && sk_SSL_COMP_find(ssl_comp_methods, comp) >= 0) {
1999         OPENSSL_free(comp);
2000         MemCheck_on();
2001         SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,
2002                SSL_R_DUPLICATE_COMPRESSION_ID);
2003         return (1);
2004     } else if ((ssl_comp_methods == NULL)
2005                || !sk_SSL_COMP_push(ssl_comp_methods, comp)) {
2006         OPENSSL_free(comp);
2007         MemCheck_on();
2008         SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD, ERR_R_MALLOC_FAILURE);
2009         return (1);
2010     } else {
2011         MemCheck_on();
2012         return (0);
2013     }
2014 }
2015 
2016 const char *SSL_COMP_get_name(const COMP_METHOD *comp)
2017 {
2018     if (comp)
2019         return comp->name;
2020     return NULL;
2021 }
2022 #endif
2023 /* For a cipher return the index corresponding to the certificate type */
2024 int ssl_cipher_get_cert_index(const SSL_CIPHER *c)
2025 {
2026     unsigned long alg_k, alg_a;
2027 
2028     alg_k = c->algorithm_mkey;
2029     alg_a = c->algorithm_auth;
2030 
2031     if (alg_k & (SSL_kECDHr | SSL_kECDHe)) {
2032         /*
2033          * we don't need to look at SSL_kEECDH since no certificate is needed
2034          * for anon ECDH and for authenticated EECDH, the check for the auth
2035          * algorithm will set i correctly NOTE: For ECDH-RSA, we need an ECC
2036          * not an RSA cert but for EECDH-RSA we need an RSA cert. Placing the
2037          * checks for SSL_kECDH before RSA checks ensures the correct cert is
2038          * chosen.
2039          */
2040         return SSL_PKEY_ECC;
2041     } else if (alg_a & SSL_aECDSA)
2042         return SSL_PKEY_ECC;
2043     else if (alg_k & SSL_kDHr)
2044         return SSL_PKEY_DH_RSA;
2045     else if (alg_k & SSL_kDHd)
2046         return SSL_PKEY_DH_DSA;
2047     else if (alg_a & SSL_aDSS)
2048         return SSL_PKEY_DSA_SIGN;
2049     else if (alg_a & SSL_aRSA)
2050         return SSL_PKEY_RSA_ENC;
2051     else if (alg_a & SSL_aKRB5)
2052         /* VRS something else here? */
2053         return -1;
2054     else if (alg_a & SSL_aGOST94)
2055         return SSL_PKEY_GOST94;
2056     else if (alg_a & SSL_aGOST01)
2057         return SSL_PKEY_GOST01;
2058     return -1;
2059 }
2060 
2061 const SSL_CIPHER *ssl_get_cipher_by_char(SSL *ssl, const unsigned char *ptr)
2062 {
2063     const SSL_CIPHER *c;
2064     c = ssl->method->get_cipher_by_char(ptr);
2065     if (c == NULL || c->valid == 0)
2066         return NULL;
2067     return c;
2068 }
2069 
2070 const SSL_CIPHER *SSL_CIPHER_find(SSL *ssl, const unsigned char *ptr)
2071 {
2072     return ssl->method->get_cipher_by_char(ptr);
2073 }
2074