aboutsummaryrefslogtreecommitdiffstats
path: root/crypto/conf/conf_mod.c
blob: 51f262e774dd60db355b0c8ea93b7c287842ee0f (plain) (blame)
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
/*
 * Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include "internal/cryptlib.h"
#include <stdio.h>
#include <ctype.h>
#include <openssl/crypto.h>
#include "internal/conf.h"
#include "internal/dso.h"
#include <openssl/x509.h>

#define DSO_mod_init_name "OPENSSL_init"
#define DSO_mod_finish_name "OPENSSL_finish"

/*
 * This structure contains a data about supported modules. entries in this
 * table correspond to either dynamic or static modules.
 */

struct conf_module_st {
    /* DSO of this module or NULL if static */
    DSO *dso;
    /* Name of the module */
    char *name;
    /* Init function */
    conf_init_func *init;
    /* Finish function */
    conf_finish_func *finish;
    /* Number of successfully initialized modules */
    int links;
    void *usr_data;
};

/*
 * This structure contains information about modules that have been
 * successfully initialized. There may be more than one entry for a given
 * module.
 */

struct conf_imodule_st {
    CONF_MODULE *pmod;
    char *name;
    char *value;
    unsigned long flags;
    void *usr_data;
};

static STACK_OF(CONF_MODULE) *supported_modules = NULL;
static STACK_OF(CONF_IMODULE) *initialized_modules = NULL;

static void module_free(CONF_MODULE *md);
static void module_finish(CONF_IMODULE *imod);
static int module_run(const CONF *cnf, const char *name, const char *value,
                      unsigned long flags);
static CONF_MODULE *module_add(DSO *dso, const char *name,
                               conf_init_func *ifunc,
                               conf_finish_func *ffunc);
static CONF_MODULE *module_find(const char *name);
static int module_init(CONF_MODULE *pmod, const char *name, const char *value,
                       const CONF *cnf);
static CONF_MODULE *module_load_dso(const CONF *cnf, const char *name,
                                    const char *value);

/* Main function: load modules from a CONF structure */

int CONF_modules_load(const CONF *cnf, const char *appname,
                      unsigned long flags)
{
    STACK_OF(CONF_VALUE) *values;
    CONF_VALUE *vl;
    char *vsection = NULL;

    int ret, i;

    if (!cnf)
        return 1;

    if (appname)
        vsection = NCONF_get_string(cnf, NULL, appname);

    if (!appname || (!vsection && (flags & CONF_MFLAGS_DEFAULT_SECTION)))
        vsection = NCONF_get_string(cnf, NULL, "openssl_conf");

    if (!vsection) {
        ERR_clear_error();
        return 1;
    }

    values = NCONF_get_section(cnf, vsection);

    if (!values)
        return 0;

    for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
        vl = sk_CONF_VALUE_value(values, i);
        ret = module_run(cnf, vl->name, vl->value, flags);
        if (ret <= 0)
            if (!(flags & CONF_MFLAGS_IGNORE_ERRORS))
                return ret;
    }

    return 1;

}

int CONF_modules_load_file(const char *filename, const char *appname,
                           unsigned long flags)
{
    char *file = NULL;
    CONF *conf = NULL;
    int ret = 0;
    conf = NCONF_new(NULL);
    if (conf == NULL)
        goto err;

    if (filename == NULL) {
        file = CONF_get1_default_config_file();
        if (!file)
            goto err;
    } else
        file = (char *)filename;

    if (NCONF_load(conf, file, NULL) <= 0) {
        if ((flags & CONF_MFLAGS_IGNORE_MISSING_FILE) &&
            (ERR_GET_REASON(ERR_peek_last_error()) == CONF_R_NO_SUCH_FILE)) {
            ERR_clear_error();
            ret = 1;
        }
        goto err;
    }

    ret = CONF_modules_load(conf, appname, flags);

 err:
    if (filename == NULL)
        OPENSSL_free(file);
    NCONF_free(conf);

    return ret;
}

static int module_run(const CONF *cnf, const char *name, const char *value,
                      unsigned long flags)
{
    CONF_MODULE *md;
    int ret;

    md = module_find(name);

    /* Module not found: try to load DSO */
    if (!md && !(flags & CONF_MFLAGS_NO_DSO))
        md = module_load_dso(cnf, name, value);

    if (!md) {
        if (!(flags & CONF_MFLAGS_SILENT)) {
            CONFerr(CONF_F_MODULE_RUN, CONF_R_UNKNOWN_MODULE_NAME);
            ERR_add_error_data(2, "module=", name);
        }
        return -1;
    }

    ret = module_init(md, name, value, cnf);

    if (ret <= 0) {
        if (!(flags & CONF_MFLAGS_SILENT)) {
            char rcode[DECIMAL_SIZE(ret) + 1];

            CONFerr(CONF_F_MODULE_RUN, CONF_R_MODULE_INITIALIZATION_ERROR);
            BIO_snprintf(rcode, sizeof(rcode), "%-8d", ret);
            ERR_add_error_data(6, "module=", name, ", value=", value,
                               ", retcode=", rcode);
        }
    }

    return ret;
}

/* Load a module from a DSO */
static CONF_MODULE *module_load_dso(const CONF *cnf,
                                    const char *name, const char *value)
{
    DSO *dso = NULL;
    conf_init_func *ifunc;
    conf_finish_func *ffunc;
    const char *path = NULL;
    int errcode = 0;
    CONF_MODULE *md;
    /* Look for alternative path in module section */
    path = NCONF_get_string(cnf, value, "path");
    if (!path) {
        ERR_clear_error();
        path = name;
    }
    dso = DSO_load(NULL, path, NULL, 0);
    if (!dso) {
        errcode = CONF_R_ERROR_LOADING_DSO;
        goto err;
    }
    ifunc = (conf_init_func *)DSO_bind_func(dso, DSO_mod_init_name);
    if (!ifunc) {
        errcode = CONF_R_MISSING_INIT_FUNCTION;
        goto err;
    }
    ffunc = (conf_finish_func *)DSO_bind_func(dso, DSO_mod_finish_name);
    /* All OK, add module */
    md = module_add(dso, name, ifunc, ffunc);

    if (!md)
        goto err;

    return md;

 err:
    DSO_free(dso);
    CONFerr(CONF_F_MODULE_LOAD_DSO, errcode);
    ERR_add_error_data(4, "module=", name, ", path=", path);
    return NULL;
}

/* add module to list */
static CONF_MODULE *module_add(DSO *dso, const char *name,
                               conf_init_func *ifunc, conf_finish_func *ffunc)
{
    CONF_MODULE *tmod = NULL;
    if (supported_modules == NULL)
        supported_modules = sk_CONF_MODULE_new_null();
    if (supported_modules == NULL)
        return NULL;
    if ((tmod = OPENSSL_zalloc(sizeof(*tmod))) == NULL) {
        CONFerr(CONF_F_MODULE_ADD, ERR_R_MALLOC_FAILURE);
        return NULL;
    }

    tmod->dso = dso;
    tmod->name = OPENSSL_strdup(name);
    tmod->init = ifunc;
    tmod->finish = ffunc;
    if (tmod->name == NULL) {
        OPENSSL_free(tmod);
        return NULL;
    }

    if (!sk_CONF_MODULE_push(supported_modules, tmod)) {
        OPENSSL_free(tmod->name);
        OPENSSL_free(tmod);
        return NULL;
    }

    return tmod;
}

/*
 * Find a module from the list. We allow module names of the form
 * modname.XXXX to just search for modname to allow the same module to be
 * initialized more than once.
 */

static CONF_MODULE *module_find(const char *name)
{
    CONF_MODULE *tmod;
    int i, nchar;
    char *p;
    p = strrchr(name, '.');

    if (p)
        nchar = p - name;
    else
        nchar = strlen(name);

    for (i = 0; i < sk_CONF_MODULE_num(supported_modules); i++) {
        tmod = sk_CONF_MODULE_value(supported_modules, i);
        if (strncmp(tmod->name, name, nchar) == 0)
            return tmod;
    }

    return NULL;

}

/* initialize a module */
static int module_init(CONF_MODULE *pmod, const char *name, const char *value,
                       const CONF *cnf)
{
    int ret = 1;
    int init_called = 0;
    CONF_IMODULE *imod = NULL;

    /* Otherwise add initialized module to list */
    imod = OPENSSL_malloc(sizeof(*imod));
    if (imod == NULL)
        goto err;

    imod->pmod = pmod;
    imod->name = OPENSSL_strdup(name);
    imod->value = OPENSSL_strdup(value);
    imod->usr_data = NULL;

    if (!imod->name || !imod->value)
        goto memerr;

    /* Try to initialize module */
    if (pmod->init) {
        ret = pmod->init(imod, cnf);
        init_called = 1;
        /* Error occurred, exit */
        if (ret <= 0)
            goto err;
    }

    if (initialized_modules == NULL) {
        initialized_modules = sk_CONF_IMODULE_new_null();
        if (!initialized_modules) {
            CONFerr(CONF_F_MODULE_INIT, ERR_R_MALLOC_FAILURE);
            goto err;
        }
    }

    if (!sk_CONF_IMODULE_push(initialized_modules, imod)) {
        CONFerr(CONF_F_MODULE_INIT, ERR_R_MALLOC_FAILURE);
        goto err;
    }

    pmod->links++;

    return ret;

 err:

    /* We've started the module so we'd better finish it */
    if (pmod->finish && init_called)
        pmod->finish(imod);

 memerr:
    if (imod) {
        OPENSSL_free(imod->name);
        OPENSSL_free(imod->value);
        OPENSSL_free(imod);
    }

    return -1;

}

/*
 * Unload any dynamic modules that have a link count of zero: i.e. have no
 * active initialized modules. If 'all' is set then all modules are unloaded
 * including static ones.
 */

void CONF_modules_unload(int all)
{
    int i;
    CONF_MODULE *md;
    CONF_modules_finish();
    /* unload modules in reverse order */
    for (i = sk_CONF_MODULE_num(supported_modules) - 1; i >= 0; i--) {
        md = sk_CONF_MODULE_value(supported_modules, i);
        /* If static or in use and 'all' not set ignore it */
        if (((md->links > 0) || !md->dso) && !all)
            continue;
        /* Since we're working in reverse this is OK */
        (void)sk_CONF_MODULE_delete(supported_modules, i);
        module_free(md);
    }
    if (sk_CONF_MODULE_num(supported_modules) == 0) {
        sk_CONF_MODULE_free(supported_modules);
        supported_modules = NULL;
    }
}

/* unload a single module */
static void module_free(CONF_MODULE *md)
{
    DSO_free(md->dso);
    OPENSSL_free(md->name);
    OPENSSL_free(md);
}

/* finish and free up all modules instances */

void CONF_modules_finish(void)
{
    CONF_IMODULE *imod;
    while (sk_CONF_IMODULE_num(initialized_modules) > 0) {
        imod = sk_CONF_IMODULE_pop(initialized_modules);
        module_finish(imod);
    }
    sk_CONF_IMODULE_free(initialized_modules);
    initialized_modules = NULL;
}

/* finish a module instance */

static void module_finish(CONF_IMODULE *imod)
{
    if (!imod)
        return;
    if (imod->pmod->finish)
        imod->pmod->finish(imod);
    imod->pmod->links--;
    OPENSSL_free(imod->name);
    OPENSSL_free(imod->value);
    OPENSSL_free(imod);
}

/* Add a static module to OpenSSL */

int CONF_module_add(const char *name, conf_init_func *ifunc,
                    conf_finish_func *ffunc)
{
    if (module_add(NULL, name, ifunc, ffunc))
        return 1;
    else
        return 0;
}

void conf_modules_free_int(void)
{
    CONF_modules_finish();
    CONF_modules_unload(1);
}

/* Utility functions */

const char *CONF_imodule_get_name(const CONF_IMODULE *md)
{
    return md->name;
}

const char *CONF_imodule_get_value(const CONF_IMODULE *md)
{
    return md->value;
}

void *CONF_imodule_get_usr_data(const CONF_IMODULE *md)
{
    return md->usr_data;
}

void CONF_imodule_set_usr_data(CONF_IMODULE *md, void *usr_data)
{
    md->usr_data = usr_data;
}

CONF_MODULE *CONF_imodule_get_module(const CONF_IMODULE *md)
{
    return md->pmod;
}

unsigned long CONF_imodule_get_flags(const CONF_IMODULE *md)
{
    return md->flags;
}

void CONF_imodule_set_flags(CONF_IMODULE *md, unsigned long flags)
{
    md->flags = flags;
}

void *CONF_module_get_usr_data(CONF_MODULE *pmod)
{
    return pmod->usr_data;
}

void CONF_module_set_usr_data(CONF_MODULE *pmod, void *usr_data)
{
    pmod->usr_data = usr_data;
}

/* Return default config file name */

char *CONF_get1_default_config_file(void)
{
    char *file, *sep = "";
    int len;

    if ((file = ossl_safe_getenv("OPENSSL_CONF")) != NULL)
        return OPENSSL_strdup(file);

    len = strlen(X509_get_default_cert_area());
#ifndef OPENSSL_SYS_VMS
    len++;
    sep = "/";
#endif
    len += strlen(OPENSSL_CONF);

    file = OPENSSL_malloc(len + 1);

    if (file == NULL)
        return NULL;
    BIO_snprintf(file, len + 1, "%s%s%s", X509_get_default_cert_area(),
                 sep, OPENSSL_CONF);

    return file;
}

/*
 * This function takes a list separated by 'sep' and calls the callback
 * function giving the start and length of each member optionally stripping
 * leading and trailing whitespace. This can be used to parse comma separated
 * lists for example.
 */

int CONF_parse_list(const char *list_, int sep, int nospc,
                    int (*list_cb) (const char *elem, int len, void *usr),
                    void *arg)
{
    int ret;
    const char *lstart, *tmpend, *p;

    if (list_ == NULL) {
        CONFerr(CONF_F_CONF_PARSE_LIST, CONF_R_LIST_CANNOT_BE_NULL);
        return 0;
    }

    lstart = list_;
    for (;;) {
        if (nospc) {
            while (*lstart && isspace((unsigned char)*lstart))
                lstart++;
        }
        p = strchr(lstart, sep);
        if (p == lstart || !*lstart)
            ret = list_cb(NULL, 0, arg);
        else {
            if (p)
                tmpend = p - 1;
            else
                tmpend = lstart + strlen(lstart) - 1;
            if (nospc) {
                while (isspace((unsigned char)*tmpend))
                    tmpend--;
            }
            ret = list_cb(lstart, tmpend - lstart + 1, arg);
        }
        if (ret <= 0)
            return ret;
        if (p == NULL)
            return 1;
        lstart = p + 1;
    }
}