aboutsummaryrefslogtreecommitdiff
path: root/openssl/ssl/ssl_conf.c
blob: 5478840deae9947b73631ad500057ac398965993 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
/*
 * ! \file ssl/ssl_conf.c \brief SSL configuration functions
 */
/* ====================================================================
 * Copyright (c) 2012 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#ifdef REF_CHECK
# include <assert.h>
#endif
#include <stdio.h>
#include "ssl_locl.h"
#include <openssl/conf.h>
#include <openssl/objects.h>
#ifndef OPENSSL_NO_DH
# include <openssl/dh.h>
#endif

/*
 * structure holding name tables. This is used for pemitted elements in lists
 * such as TLSv1 and single command line switches such as no_tls1
 */

typedef struct {
    const char *name;
    int namelen;
    unsigned int name_flags;
    unsigned long option_value;
} ssl_flag_tbl;

/* Sense of name is inverted e.g. "TLSv1" will clear SSL_OP_NO_TLSv1 */
#define SSL_TFLAG_INV   0x1
/* Flags refers to cert_flags not options */
#define SSL_TFLAG_CERT  0x2
/* Option can only be used for clients */
#define SSL_TFLAG_CLIENT SSL_CONF_FLAG_CLIENT
/* Option can only be used for servers */
#define SSL_TFLAG_SERVER SSL_CONF_FLAG_SERVER
#define SSL_TFLAG_BOTH (SSL_TFLAG_CLIENT|SSL_TFLAG_SERVER)

#define SSL_FLAG_TBL(str, flag) \
        {str, (int)(sizeof(str) - 1), SSL_TFLAG_BOTH, flag}
#define SSL_FLAG_TBL_SRV(str, flag) \
        {str, (int)(sizeof(str) - 1), SSL_TFLAG_SERVER, flag}
#define SSL_FLAG_TBL_CLI(str, flag) \
        {str, (int)(sizeof(str) - 1), SSL_TFLAG_CLIENT, flag}
#define SSL_FLAG_TBL_INV(str, flag) \
        {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_BOTH, flag}
#define SSL_FLAG_TBL_SRV_INV(str, flag) \
        {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_SERVER, flag}
#define SSL_FLAG_TBL_CERT(str, flag) \
        {str, (int)(sizeof(str) - 1), SSL_TFLAG_CERT|SSL_TFLAG_BOTH, flag}

/*
 * Opaque structure containing SSL configuration context.
 */

struct ssl_conf_ctx_st {
    /*
     * Various flags indicating (among other things) which options we will
     * recognise.
     */
    unsigned int flags;
    /* Prefix and length of commands */
    char *prefix;
    size_t prefixlen;
    /* SSL_CTX or SSL structure to perform operations on */
    SSL_CTX *ctx;
    SSL *ssl;
    /* Pointer to SSL or SSL_CTX options field or NULL if none */
    unsigned long *poptions;
    /* Pointer to SSL or SSL_CTX cert_flags or NULL if none */
    unsigned int *pcert_flags;
    /* Current flag table being worked on */
    const ssl_flag_tbl *tbl;
    /* Size of table */
    size_t ntbl;
};

static int ssl_match_option(SSL_CONF_CTX *cctx, const ssl_flag_tbl *tbl,
                            const char *name, int namelen, int onoff)
{
    /* If name not relevant for context skip */
    if (!(cctx->flags & tbl->name_flags & SSL_TFLAG_BOTH))
        return 0;
    if (namelen == -1) {
        if (strcmp(tbl->name, name))
            return 0;
    } else if (tbl->namelen != namelen
               || strncasecmp(tbl->name, name, namelen))
        return 0;
    if (cctx->poptions) {
        if (tbl->name_flags & SSL_TFLAG_INV)
            onoff ^= 1;
        if (tbl->name_flags & SSL_TFLAG_CERT) {
            if (onoff)
                *cctx->pcert_flags |= tbl->option_value;
            else
                *cctx->pcert_flags &= ~tbl->option_value;
        } else {
            if (onoff)
                *cctx->poptions |= tbl->option_value;
            else
                *cctx->poptions &= ~tbl->option_value;
        }
    }
    return 1;
}

static int ssl_set_option_list(const char *elem, int len, void *usr)
{
    SSL_CONF_CTX *cctx = usr;
    size_t i;
    const ssl_flag_tbl *tbl;
    int onoff = 1;
    /*
     * len == -1 indicates not being called in list context, just for single
     * command line switches, so don't allow +, -.
     */
    if (elem == NULL)
        return 0;
    if (len != -1) {
        if (*elem == '+') {
            elem++;
            len--;
            onoff = 1;
        } else if (*elem == '-') {
            elem++;
            len--;
            onoff = 0;
        }
    }
    for (i = 0, tbl = cctx->tbl; i < cctx->ntbl; i++, tbl++) {
        if (ssl_match_option(cctx, tbl, elem, len, onoff))
            return 1;
    }
    return 0;
}

/* Single command line switches with no argument e.g. -no_ssl3 */
static int ctrl_str_option(SSL_CONF_CTX *cctx, const char *cmd)
{
    static const ssl_flag_tbl ssl_option_single[] = {
        SSL_FLAG_TBL("no_ssl2", SSL_OP_NO_SSLv2),
        SSL_FLAG_TBL("no_ssl3", SSL_OP_NO_SSLv3),
        SSL_FLAG_TBL("no_tls1", SSL_OP_NO_TLSv1),
        SSL_FLAG_TBL("no_tls1_1", SSL_OP_NO_TLSv1_1),
        SSL_FLAG_TBL("no_tls1_2", SSL_OP_NO_TLSv1_2),
        SSL_FLAG_TBL("bugs", SSL_OP_ALL),
        SSL_FLAG_TBL("no_comp", SSL_OP_NO_COMPRESSION),
        SSL_FLAG_TBL_SRV("ecdh_single", SSL_OP_SINGLE_ECDH_USE),
#ifndef OPENSSL_NO_TLSEXT
        SSL_FLAG_TBL("no_ticket", SSL_OP_NO_TICKET),
#endif
        SSL_FLAG_TBL_SRV("serverpref", SSL_OP_CIPHER_SERVER_PREFERENCE),
        SSL_FLAG_TBL("legacy_renegotiation",
                     SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
        SSL_FLAG_TBL_SRV("legacy_server_connect",
                         SSL_OP_LEGACY_SERVER_CONNECT),
        SSL_FLAG_TBL_SRV("no_resumption_on_reneg",
                         SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
        SSL_FLAG_TBL_SRV_INV("no_legacy_server_connect",
                             SSL_OP_LEGACY_SERVER_CONNECT),
        SSL_FLAG_TBL_CERT("strict", SSL_CERT_FLAG_TLS_STRICT),
#ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
        SSL_FLAG_TBL_CERT("debug_broken_protocol",
                          SSL_CERT_FLAG_BROKEN_PROTOCOL),
#endif
    };
    cctx->tbl = ssl_option_single;
    cctx->ntbl = sizeof(ssl_option_single) / sizeof(ssl_flag_tbl);
    return ssl_set_option_list(cmd, -1, cctx);
}

/* Set supported signature algorithms */
static int cmd_SignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
{
    int rv;
    if (cctx->ssl)
        rv = SSL_set1_sigalgs_list(cctx->ssl, value);
    /* NB: ctx == NULL performs syntax checking only */
    else
        rv = SSL_CTX_set1_sigalgs_list(cctx->ctx, value);
    return rv > 0;
}

/* Set supported client signature algorithms */
static int cmd_ClientSignatureAlgorithms(SSL_CONF_CTX *cctx,
                                         const char *value)
{
    int rv;
    if (cctx->ssl)
        rv = SSL_set1_client_sigalgs_list(cctx->ssl, value);
    /* NB: ctx == NULL performs syntax checking only */
    else
        rv = SSL_CTX_set1_client_sigalgs_list(cctx->ctx, value);
    return rv > 0;
}

static int cmd_Curves(SSL_CONF_CTX *cctx, const char *value)
{
    int rv;
    if (cctx->ssl)
        rv = SSL_set1_curves_list(cctx->ssl, value);
    /* NB: ctx == NULL performs syntax checking only */
    else
        rv = SSL_CTX_set1_curves_list(cctx->ctx, value);
    return rv > 0;
}

#ifndef OPENSSL_NO_ECDH
/* ECDH temporary parameters */
static int cmd_ECDHParameters(SSL_CONF_CTX *cctx, const char *value)
{
    int onoff = -1, rv = 1;
    if (!(cctx->flags & SSL_CONF_FLAG_SERVER))
        return -2;
    if (cctx->flags & SSL_CONF_FLAG_FILE) {
        if (*value == '+') {
            onoff = 1;
            value++;
        }
        if (*value == '-') {
            onoff = 0;
            value++;
        }
        if (!strcasecmp(value, "automatic")) {
            if (onoff == -1)
                onoff = 1;
        } else if (onoff != -1)
            return 0;
    } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
        if (!strcmp(value, "auto"))
            onoff = 1;
    }

    if (onoff != -1) {
        if (cctx->ctx)
            rv = SSL_CTX_set_ecdh_auto(cctx->ctx, onoff);
        else if (cctx->ssl)
            rv = SSL_set_ecdh_auto(cctx->ssl, onoff);
    } else {
        EC_KEY *ecdh;
        int nid;
        nid = EC_curve_nist2nid(value);
        if (nid == NID_undef)
            nid = OBJ_sn2nid(value);
        if (nid == 0)
            return 0;
        ecdh = EC_KEY_new_by_curve_name(nid);
        if (!ecdh)
            return 0;
        if (cctx->ctx)
            rv = SSL_CTX_set_tmp_ecdh(cctx->ctx, ecdh);
        else if (cctx->ssl)
            rv = SSL_set_tmp_ecdh(cctx->ssl, ecdh);
        EC_KEY_free(ecdh);
    }

    return rv > 0;
}
#endif
static int cmd_CipherString(SSL_CONF_CTX *cctx, const char *value)
{
    int rv = 1;
    if (cctx->ctx)
        rv = SSL_CTX_set_cipher_list(cctx->ctx, value);
    if (cctx->ssl)
        rv = SSL_set_cipher_list(cctx->ssl, value);
    return rv > 0;
}

static int cmd_Protocol(SSL_CONF_CTX *cctx, const char *value)
{
    static const ssl_flag_tbl ssl_protocol_list[] = {
        SSL_FLAG_TBL_INV("ALL", SSL_OP_NO_SSL_MASK),
        SSL_FLAG_TBL_INV("SSLv2", SSL_OP_NO_SSLv2),
        SSL_FLAG_TBL_INV("SSLv3", SSL_OP_NO_SSLv3),
        SSL_FLAG_TBL_INV("TLSv1", SSL_OP_NO_TLSv1),
        SSL_FLAG_TBL_INV("TLSv1.1", SSL_OP_NO_TLSv1_1),
        SSL_FLAG_TBL_INV("TLSv1.2", SSL_OP_NO_TLSv1_2)
    };
    if (!(cctx->flags & SSL_CONF_FLAG_FILE))
        return -2;
    cctx->tbl = ssl_protocol_list;
    cctx->ntbl = sizeof(ssl_protocol_list) / sizeof(ssl_flag_tbl);
    return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
}

static int cmd_Options(SSL_CONF_CTX *cctx, const char *value)
{
    static const ssl_flag_tbl ssl_option_list[] = {
        SSL_FLAG_TBL_INV("SessionTicket", SSL_OP_NO_TICKET),
        SSL_FLAG_TBL_INV("EmptyFragments",
                         SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS),
        SSL_FLAG_TBL("Bugs", SSL_OP_ALL),
        SSL_FLAG_TBL_INV("Compression", SSL_OP_NO_COMPRESSION),
        SSL_FLAG_TBL_SRV("ServerPreference", SSL_OP_CIPHER_SERVER_PREFERENCE),
        SSL_FLAG_TBL_SRV("NoResumptionOnRenegotiation",
                         SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
        SSL_FLAG_TBL_SRV("DHSingle", SSL_OP_SINGLE_DH_USE),
        SSL_FLAG_TBL_SRV("ECDHSingle", SSL_OP_SINGLE_ECDH_USE),
        SSL_FLAG_TBL("UnsafeLegacyRenegotiation",
                     SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
    };
    if (!(cctx->flags & SSL_CONF_FLAG_FILE))
        return -2;
    if (value == NULL)
        return -3;
    cctx->tbl = ssl_option_list;
    cctx->ntbl = sizeof(ssl_option_list) / sizeof(ssl_flag_tbl);
    return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
}

static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
{
    int rv = 1;
    if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
        return -2;
    if (cctx->ctx)
        rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
    if (cctx->ssl)
        rv = SSL_use_certificate_file(cctx->ssl, value, SSL_FILETYPE_PEM);
    return rv > 0;
}

static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
{
    int rv = 1;
    if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
        return -2;
    if (cctx->ctx)
        rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
    if (cctx->ssl)
        rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
    return rv > 0;
}

static int cmd_ServerInfoFile(SSL_CONF_CTX *cctx, const char *value)
{
    int rv = 1;
    if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
        return -2;
    if (!(cctx->flags & SSL_CONF_FLAG_SERVER))
        return -2;
    if (cctx->ctx)
        rv = SSL_CTX_use_serverinfo_file(cctx->ctx, value);
    return rv > 0;
}

#ifndef OPENSSL_NO_DH
static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
{
    int rv = 0;
    DH *dh = NULL;
    BIO *in = NULL;
    if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
        return -2;
    if (cctx->ctx || cctx->ssl) {
        in = BIO_new(BIO_s_file_internal());
        if (!in)
            goto end;
        if (BIO_read_filename(in, value) <= 0)
            goto end;
        dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
        if (!dh)
            goto end;
    } else
        return 1;
    if (cctx->ctx)
        rv = SSL_CTX_set_tmp_dh(cctx->ctx, dh);
    if (cctx->ssl)
        rv = SSL_set_tmp_dh(cctx->ssl, dh);
 end:
    if (dh)
        DH_free(dh);
    if (in)
        BIO_free(in);
    return rv > 0;
}
#endif
typedef struct {
    int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
    const char *str_file;
    const char *str_cmdline;
    unsigned int value_type;
} ssl_conf_cmd_tbl;

/* Table of supported parameters */

#define SSL_CONF_CMD(name, cmdopt, type) \
        {cmd_##name, #name, cmdopt, type}

#define SSL_CONF_CMD_STRING(name, cmdopt) \
        SSL_CONF_CMD(name, cmdopt, SSL_CONF_TYPE_STRING)

static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
    SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs"),
    SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs"),
    SSL_CONF_CMD_STRING(Curves, "curves"),
#ifndef OPENSSL_NO_ECDH
    SSL_CONF_CMD_STRING(ECDHParameters, "named_curve"),
#endif
    SSL_CONF_CMD_STRING(CipherString, "cipher"),
    SSL_CONF_CMD_STRING(Protocol, NULL),
    SSL_CONF_CMD_STRING(Options, NULL),
    SSL_CONF_CMD(Certificate, "cert", SSL_CONF_TYPE_FILE),
    SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_TYPE_FILE),
    SSL_CONF_CMD(ServerInfoFile, NULL, SSL_CONF_TYPE_FILE),
#ifndef OPENSSL_NO_DH
    SSL_CONF_CMD(DHParameters, "dhparam", SSL_CONF_TYPE_FILE)
#endif
};

static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
{
    if (!pcmd || !*pcmd)
        return 0;
    /* If a prefix is set, check and skip */
    if (cctx->prefix) {
        if (strlen(*pcmd) <= cctx->prefixlen)
            return 0;
        if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
            strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
            return 0;
        if (cctx->flags & SSL_CONF_FLAG_FILE &&
            strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
            return 0;
        *pcmd += cctx->prefixlen;
    } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
        if (**pcmd != '-' || !(*pcmd)[1])
            return 0;
        *pcmd += 1;
    }
    return 1;
}

static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
                                                   const char *cmd)
{
    const ssl_conf_cmd_tbl *t;
    size_t i;
    if (cmd == NULL)
        return NULL;

    /* Look for matching parameter name in table */
    for (i = 0, t = ssl_conf_cmds;
         i < sizeof(ssl_conf_cmds) / sizeof(ssl_conf_cmd_tbl); i++, t++) {
        if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
            if (t->str_cmdline && !strcmp(t->str_cmdline, cmd))
                return t;
        }
        if (cctx->flags & SSL_CONF_FLAG_FILE) {
            if (t->str_file && !strcasecmp(t->str_file, cmd))
                return t;
        }
    }
    return NULL;
}

int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
{
    const ssl_conf_cmd_tbl *runcmd;
    if (cmd == NULL) {
        SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_INVALID_NULL_CMD_NAME);
        return 0;
    }

    if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
        return -2;

    runcmd = ssl_conf_cmd_lookup(cctx, cmd);

    if (runcmd) {
        int rv;
        if (value == NULL)
            return -3;
        rv = runcmd->cmd(cctx, value);
        if (rv > 0)
            return 2;
        if (rv == -2)
            return -2;
        if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
            SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_BAD_VALUE);
            ERR_add_error_data(4, "cmd=", cmd, ", value=", value);
        }
        return 0;
    }

    if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
        if (ctrl_str_option(cctx, cmd))
            return 1;
    }

    if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
        SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_UNKNOWN_CMD_NAME);
        ERR_add_error_data(2, "cmd=", cmd);
    }

    return -2;
}

int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
{
    int rv;
    const char *arg = NULL, *argn;
    if (pargc && *pargc == 0)
        return 0;
    if (!pargc || *pargc > 0)
        arg = **pargv;
    if (arg == NULL)
        return 0;
    if (!pargc || *pargc > 1)
        argn = (*pargv)[1];
    else
        argn = NULL;
    cctx->flags &= ~SSL_CONF_FLAG_FILE;
    cctx->flags |= SSL_CONF_FLAG_CMDLINE;
    rv = SSL_CONF_cmd(cctx, arg, argn);
    if (rv > 0) {
        /* Success: update pargc, pargv */
        (*pargv) += rv;
        if (pargc)
            (*pargc) -= rv;
        return rv;
    }
    /* Unknown switch: indicate no arguments processed */
    if (rv == -2)
        return 0;
    /* Some error occurred processing command, return fatal error */
    if (rv == 0)
        return -1;
    return rv;
}

int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
{
    if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
        const ssl_conf_cmd_tbl *runcmd;
        runcmd = ssl_conf_cmd_lookup(cctx, cmd);
        if (runcmd)
            return runcmd->value_type;
    }
    return SSL_CONF_TYPE_UNKNOWN;
}

SSL_CONF_CTX *SSL_CONF_CTX_new(void)
{
    SSL_CONF_CTX *ret;
    ret = OPENSSL_malloc(sizeof(SSL_CONF_CTX));
    if (ret) {
        ret->flags = 0;
        ret->prefix = NULL;
        ret->prefixlen = 0;
        ret->ssl = NULL;
        ret->ctx = NULL;
        ret->poptions = NULL;
        ret->pcert_flags = NULL;
        ret->tbl = NULL;
        ret->ntbl = 0;
    }
    return ret;
}

int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
{
    return 1;
}

void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
{
    if (cctx) {
        if (cctx->prefix)
            OPENSSL_free(cctx->prefix);
        OPENSSL_free(cctx);
    }
}

unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
{
    cctx->flags |= flags;
    return cctx->flags;
}

unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
{
    cctx->flags &= ~flags;
    return cctx->flags;
}

int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
{
    char *tmp = NULL;
    if (pre) {
        tmp = BUF_strdup(pre);
        if (tmp == NULL)
            return 0;
    }
    if (cctx->prefix)
        OPENSSL_free(cctx->prefix);
    cctx->prefix = tmp;
    if (tmp)
        cctx->prefixlen = strlen(tmp);
    else
        cctx->prefixlen = 0;
    return 1;
}

void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
{
    cctx->ssl = ssl;
    cctx->ctx = NULL;
    if (ssl) {
        cctx->poptions = &ssl->options;
        cctx->pcert_flags = &ssl->cert->cert_flags;
    } else {
        cctx->poptions = NULL;
        cctx->pcert_flags = NULL;
    }
}

void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
{
    cctx->ctx = ctx;
    cctx->ssl = NULL;
    if (ctx) {
        cctx->poptions = &ctx->options;
        cctx->pcert_flags = &ctx->cert->cert_flags;
    } else {
        cctx->poptions = NULL;
        cctx->pcert_flags = NULL;
    }
}