1/*
2 * Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License").  You may not use
5 * this file except in compliance with the License.  You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10/* We need to use some engine deprecated APIs */
11#define OPENSSL_SUPPRESS_DEPRECATED
12
13#include <string.h>
14
15#include <openssl/crypto.h>
16#include "internal/cryptlib.h"
17#include <openssl/pem.h>
18#include <openssl/engine.h>
19#include <openssl/ts.h>
20#include <openssl/conf_api.h>
21
22/* Macro definitions for the configuration file. */
23#define BASE_SECTION                    "tsa"
24#define ENV_DEFAULT_TSA                 "default_tsa"
25#define ENV_SERIAL                      "serial"
26#define ENV_CRYPTO_DEVICE               "crypto_device"
27#define ENV_SIGNER_CERT                 "signer_cert"
28#define ENV_CERTS                       "certs"
29#define ENV_SIGNER_KEY                  "signer_key"
30#define ENV_SIGNER_DIGEST               "signer_digest"
31#define ENV_DEFAULT_POLICY              "default_policy"
32#define ENV_OTHER_POLICIES              "other_policies"
33#define ENV_DIGESTS                     "digests"
34#define ENV_ACCURACY                    "accuracy"
35#define ENV_ORDERING                    "ordering"
36#define ENV_TSA_NAME                    "tsa_name"
37#define ENV_ESS_CERT_ID_CHAIN           "ess_cert_id_chain"
38#define ENV_VALUE_SECS                  "secs"
39#define ENV_VALUE_MILLISECS             "millisecs"
40#define ENV_VALUE_MICROSECS             "microsecs"
41#define ENV_CLOCK_PRECISION_DIGITS      "clock_precision_digits"
42#define ENV_VALUE_YES                   "yes"
43#define ENV_VALUE_NO                    "no"
44#define ENV_ESS_CERT_ID_ALG             "ess_cert_id_alg"
45
46/* Function definitions for certificate and key loading. */
47
48X509 *TS_CONF_load_cert(const char *file)
49{
50    BIO *cert = NULL;
51    X509 *x = NULL;
52
53    if ((cert = BIO_new_file(file, "r")) == NULL)
54        goto end;
55    x = PEM_read_bio_X509_AUX(cert, NULL, NULL, NULL);
56 end:
57    if (x == NULL)
58        ERR_raise(ERR_LIB_TS, TS_R_CANNOT_LOAD_CERT);
59    BIO_free(cert);
60    return x;
61}
62
63STACK_OF(X509) *TS_CONF_load_certs(const char *file)
64{
65    BIO *certs = NULL;
66    STACK_OF(X509) *othercerts = NULL;
67    STACK_OF(X509_INFO) *allcerts = NULL;
68    int i;
69
70    if ((certs = BIO_new_file(file, "r")) == NULL)
71        goto end;
72    if ((othercerts = sk_X509_new_null()) == NULL)
73        goto end;
74
75    allcerts = PEM_X509_INFO_read_bio(certs, NULL, NULL, NULL);
76    for (i = 0; i < sk_X509_INFO_num(allcerts); i++) {
77        X509_INFO *xi = sk_X509_INFO_value(allcerts, i);
78
79        if (xi->x509 != NULL) {
80            if (!X509_add_cert(othercerts, xi->x509, X509_ADD_FLAG_DEFAULT)) {
81                sk_X509_pop_free(othercerts, X509_free);
82                othercerts = NULL;
83                goto end;
84            }
85            xi->x509 = NULL;
86        }
87    }
88 end:
89    if (othercerts == NULL)
90        ERR_raise(ERR_LIB_TS, TS_R_CANNOT_LOAD_CERT);
91    sk_X509_INFO_pop_free(allcerts, X509_INFO_free);
92    BIO_free(certs);
93    return othercerts;
94}
95
96EVP_PKEY *TS_CONF_load_key(const char *file, const char *pass)
97{
98    BIO *key = NULL;
99    EVP_PKEY *pkey = NULL;
100
101    if ((key = BIO_new_file(file, "r")) == NULL)
102        goto end;
103    pkey = PEM_read_bio_PrivateKey(key, NULL, NULL, (char *)pass);
104 end:
105    if (pkey == NULL)
106        ERR_raise(ERR_LIB_TS, TS_R_CANNOT_LOAD_KEY);
107    BIO_free(key);
108    return pkey;
109}
110
111/* Function definitions for handling configuration options. */
112
113static void ts_CONF_lookup_fail(const char *name, const char *tag)
114{
115    ERR_raise_data(ERR_LIB_TS, TS_R_VAR_LOOKUP_FAILURE, "%s::%s", name, tag);
116}
117
118static void ts_CONF_invalid(const char *name, const char *tag)
119{
120    ERR_raise_data(ERR_LIB_TS, TS_R_VAR_BAD_VALUE, "%s::%s", name, tag);
121}
122
123const char *TS_CONF_get_tsa_section(CONF *conf, const char *section)
124{
125    if (!section) {
126        section = NCONF_get_string(conf, BASE_SECTION, ENV_DEFAULT_TSA);
127        if (!section)
128            ts_CONF_lookup_fail(BASE_SECTION, ENV_DEFAULT_TSA);
129    }
130    return section;
131}
132
133int TS_CONF_set_serial(CONF *conf, const char *section, TS_serial_cb cb,
134                       TS_RESP_CTX *ctx)
135{
136    int ret = 0;
137    char *serial = NCONF_get_string(conf, section, ENV_SERIAL);
138    if (!serial) {
139        ts_CONF_lookup_fail(section, ENV_SERIAL);
140        goto err;
141    }
142    TS_RESP_CTX_set_serial_cb(ctx, cb, serial);
143
144    ret = 1;
145 err:
146    return ret;
147}
148
149#ifndef OPENSSL_NO_ENGINE
150
151int TS_CONF_set_crypto_device(CONF *conf, const char *section,
152                              const char *device)
153{
154    int ret = 0;
155
156    if (device == NULL)
157        device = NCONF_get_string(conf, section, ENV_CRYPTO_DEVICE);
158
159    if (device && !TS_CONF_set_default_engine(device)) {
160        ts_CONF_invalid(section, ENV_CRYPTO_DEVICE);
161        goto err;
162    }
163    ret = 1;
164 err:
165    return ret;
166}
167
168int TS_CONF_set_default_engine(const char *name)
169{
170    ENGINE *e = NULL;
171    int ret = 0;
172
173    if (strcmp(name, "builtin") == 0)
174        return 1;
175
176    if ((e = ENGINE_by_id(name)) == NULL)
177        goto err;
178    if (strcmp(name, "chil") == 0)
179        ENGINE_ctrl(e, ENGINE_CTRL_CHIL_SET_FORKCHECK, 1, 0, 0);
180    if (!ENGINE_set_default(e, ENGINE_METHOD_ALL))
181        goto err;
182    ret = 1;
183
184 err:
185    if (!ret)
186        ERR_raise_data(ERR_LIB_TS, TS_R_COULD_NOT_SET_ENGINE,
187                       "engine:%s", name);
188    ENGINE_free(e);
189    return ret;
190}
191
192#endif
193
194int TS_CONF_set_signer_cert(CONF *conf, const char *section,
195                            const char *cert, TS_RESP_CTX *ctx)
196{
197    int ret = 0;
198    X509 *cert_obj = NULL;
199
200    if (cert == NULL) {
201        cert = NCONF_get_string(conf, section, ENV_SIGNER_CERT);
202        if (cert == NULL) {
203            ts_CONF_lookup_fail(section, ENV_SIGNER_CERT);
204            goto err;
205        }
206    }
207    if ((cert_obj = TS_CONF_load_cert(cert)) == NULL)
208        goto err;
209    if (!TS_RESP_CTX_set_signer_cert(ctx, cert_obj))
210        goto err;
211
212    ret = 1;
213 err:
214    X509_free(cert_obj);
215    return ret;
216}
217
218int TS_CONF_set_certs(CONF *conf, const char *section, const char *certs,
219                      TS_RESP_CTX *ctx)
220{
221    int ret = 0;
222    STACK_OF(X509) *certs_obj = NULL;
223
224    if (certs == NULL) {
225        /* Certificate chain is optional. */
226        if ((certs = NCONF_get_string(conf, section, ENV_CERTS)) == NULL)
227            goto end;
228    }
229    if ((certs_obj = TS_CONF_load_certs(certs)) == NULL)
230        goto err;
231    if (!TS_RESP_CTX_set_certs(ctx, certs_obj))
232        goto err;
233 end:
234    ret = 1;
235 err:
236    sk_X509_pop_free(certs_obj, X509_free);
237    return ret;
238}
239
240int TS_CONF_set_signer_key(CONF *conf, const char *section,
241                           const char *key, const char *pass,
242                           TS_RESP_CTX *ctx)
243{
244    int ret = 0;
245    EVP_PKEY *key_obj = NULL;
246    if (!key)
247        key = NCONF_get_string(conf, section, ENV_SIGNER_KEY);
248    if (!key) {
249        ts_CONF_lookup_fail(section, ENV_SIGNER_KEY);
250        goto err;
251    }
252    if ((key_obj = TS_CONF_load_key(key, pass)) == NULL)
253        goto err;
254    if (!TS_RESP_CTX_set_signer_key(ctx, key_obj))
255        goto err;
256
257    ret = 1;
258 err:
259    EVP_PKEY_free(key_obj);
260    return ret;
261}
262
263int TS_CONF_set_signer_digest(CONF *conf, const char *section,
264                              const char *md, TS_RESP_CTX *ctx)
265{
266    int ret = 0;
267    const EVP_MD *sign_md = NULL;
268    if (md == NULL)
269        md = NCONF_get_string(conf, section, ENV_SIGNER_DIGEST);
270    if (md == NULL) {
271        ts_CONF_lookup_fail(section, ENV_SIGNER_DIGEST);
272        goto err;
273    }
274    sign_md = EVP_get_digestbyname(md);
275    if (sign_md == NULL) {
276        ts_CONF_invalid(section, ENV_SIGNER_DIGEST);
277        goto err;
278    }
279    if (!TS_RESP_CTX_set_signer_digest(ctx, sign_md))
280        goto err;
281
282    ret = 1;
283 err:
284    return ret;
285}
286
287int TS_CONF_set_def_policy(CONF *conf, const char *section,
288                           const char *policy, TS_RESP_CTX *ctx)
289{
290    int ret = 0;
291    ASN1_OBJECT *policy_obj = NULL;
292
293    if (policy == NULL)
294        policy = NCONF_get_string(conf, section, ENV_DEFAULT_POLICY);
295    if (policy == NULL) {
296        ts_CONF_lookup_fail(section, ENV_DEFAULT_POLICY);
297        goto err;
298    }
299    if ((policy_obj = OBJ_txt2obj(policy, 0)) == NULL) {
300        ts_CONF_invalid(section, ENV_DEFAULT_POLICY);
301        goto err;
302    }
303    if (!TS_RESP_CTX_set_def_policy(ctx, policy_obj))
304        goto err;
305
306    ret = 1;
307 err:
308    ASN1_OBJECT_free(policy_obj);
309    return ret;
310}
311
312int TS_CONF_set_policies(CONF *conf, const char *section, TS_RESP_CTX *ctx)
313{
314    int ret = 0;
315    int i;
316    STACK_OF(CONF_VALUE) *list = NULL;
317    char *policies = NCONF_get_string(conf, section, ENV_OTHER_POLICIES);
318
319    /* If no other policy is specified, that's fine. */
320    if (policies && (list = X509V3_parse_list(policies)) == NULL) {
321        ts_CONF_invalid(section, ENV_OTHER_POLICIES);
322        goto err;
323    }
324    for (i = 0; i < sk_CONF_VALUE_num(list); ++i) {
325        CONF_VALUE *val = sk_CONF_VALUE_value(list, i);
326        const char *extval = val->value ? val->value : val->name;
327        ASN1_OBJECT *objtmp;
328
329        if ((objtmp = OBJ_txt2obj(extval, 0)) == NULL) {
330            ts_CONF_invalid(section, ENV_OTHER_POLICIES);
331            goto err;
332        }
333        if (!TS_RESP_CTX_add_policy(ctx, objtmp))
334            goto err;
335        ASN1_OBJECT_free(objtmp);
336    }
337
338    ret = 1;
339 err:
340    sk_CONF_VALUE_pop_free(list, X509V3_conf_free);
341    return ret;
342}
343
344int TS_CONF_set_digests(CONF *conf, const char *section, TS_RESP_CTX *ctx)
345{
346    int ret = 0;
347    int i;
348    STACK_OF(CONF_VALUE) *list = NULL;
349    char *digests = NCONF_get_string(conf, section, ENV_DIGESTS);
350
351    if (digests == NULL) {
352        ts_CONF_lookup_fail(section, ENV_DIGESTS);
353        goto err;
354    }
355    if ((list = X509V3_parse_list(digests)) == NULL) {
356        ts_CONF_invalid(section, ENV_DIGESTS);
357        goto err;
358    }
359    if (sk_CONF_VALUE_num(list) == 0) {
360        ts_CONF_invalid(section, ENV_DIGESTS);
361        goto err;
362    }
363    for (i = 0; i < sk_CONF_VALUE_num(list); ++i) {
364        CONF_VALUE *val = sk_CONF_VALUE_value(list, i);
365        const char *extval = val->value ? val->value : val->name;
366        const EVP_MD *md;
367
368        if ((md = EVP_get_digestbyname(extval)) == NULL) {
369            ts_CONF_invalid(section, ENV_DIGESTS);
370            goto err;
371        }
372        if (!TS_RESP_CTX_add_md(ctx, md))
373            goto err;
374    }
375
376    ret = 1;
377 err:
378    sk_CONF_VALUE_pop_free(list, X509V3_conf_free);
379    return ret;
380}
381
382int TS_CONF_set_accuracy(CONF *conf, const char *section, TS_RESP_CTX *ctx)
383{
384    int ret = 0;
385    int i;
386    int secs = 0, millis = 0, micros = 0;
387    STACK_OF(CONF_VALUE) *list = NULL;
388    char *accuracy = NCONF_get_string(conf, section, ENV_ACCURACY);
389
390    if (accuracy && (list = X509V3_parse_list(accuracy)) == NULL) {
391        ts_CONF_invalid(section, ENV_ACCURACY);
392        goto err;
393    }
394    for (i = 0; i < sk_CONF_VALUE_num(list); ++i) {
395        CONF_VALUE *val = sk_CONF_VALUE_value(list, i);
396        if (strcmp(val->name, ENV_VALUE_SECS) == 0) {
397            if (val->value)
398                secs = atoi(val->value);
399        } else if (strcmp(val->name, ENV_VALUE_MILLISECS) == 0) {
400            if (val->value)
401                millis = atoi(val->value);
402        } else if (strcmp(val->name, ENV_VALUE_MICROSECS) == 0) {
403            if (val->value)
404                micros = atoi(val->value);
405        } else {
406            ts_CONF_invalid(section, ENV_ACCURACY);
407            goto err;
408        }
409    }
410    if (!TS_RESP_CTX_set_accuracy(ctx, secs, millis, micros))
411        goto err;
412
413    ret = 1;
414 err:
415    sk_CONF_VALUE_pop_free(list, X509V3_conf_free);
416    return ret;
417}
418
419int TS_CONF_set_clock_precision_digits(const CONF *conf, const char *section,
420                                       TS_RESP_CTX *ctx)
421{
422    int ret = 0;
423    long digits = 0;
424
425    /*
426     * If not specified, set the default value to 0, i.e. sec precision
427     */
428    digits = _CONF_get_number(conf, section, ENV_CLOCK_PRECISION_DIGITS);
429    if (digits < 0 || digits > TS_MAX_CLOCK_PRECISION_DIGITS) {
430        ts_CONF_invalid(section, ENV_CLOCK_PRECISION_DIGITS);
431        goto err;
432    }
433
434    if (!TS_RESP_CTX_set_clock_precision_digits(ctx, digits))
435        goto err;
436
437    return 1;
438 err:
439    return ret;
440}
441
442static int ts_CONF_add_flag(CONF *conf, const char *section,
443                            const char *field, int flag, TS_RESP_CTX *ctx)
444{
445    const char *value = NCONF_get_string(conf, section, field);
446
447    if (value) {
448        if (strcmp(value, ENV_VALUE_YES) == 0)
449            TS_RESP_CTX_add_flags(ctx, flag);
450        else if (strcmp(value, ENV_VALUE_NO) != 0) {
451            ts_CONF_invalid(section, field);
452            return 0;
453        }
454    }
455
456    return 1;
457}
458
459int TS_CONF_set_ordering(CONF *conf, const char *section, TS_RESP_CTX *ctx)
460{
461    return ts_CONF_add_flag(conf, section, ENV_ORDERING, TS_ORDERING, ctx);
462}
463
464int TS_CONF_set_tsa_name(CONF *conf, const char *section, TS_RESP_CTX *ctx)
465{
466    return ts_CONF_add_flag(conf, section, ENV_TSA_NAME, TS_TSA_NAME, ctx);
467}
468
469int TS_CONF_set_ess_cert_id_chain(CONF *conf, const char *section,
470                                  TS_RESP_CTX *ctx)
471{
472    return ts_CONF_add_flag(conf, section, ENV_ESS_CERT_ID_CHAIN,
473                            TS_ESS_CERT_ID_CHAIN, ctx);
474}
475
476int TS_CONF_set_ess_cert_id_digest(CONF *conf, const char *section,
477                                   TS_RESP_CTX *ctx)
478{
479    int ret = 0;
480    const EVP_MD *cert_md = NULL;
481    const char *md = NCONF_get_string(conf, section, ENV_ESS_CERT_ID_ALG);
482
483    if (md == NULL)
484        md = "sha1";
485
486    cert_md = EVP_get_digestbyname(md);
487    if (cert_md == NULL) {
488        ts_CONF_invalid(section, ENV_ESS_CERT_ID_ALG);
489        goto err;
490    }
491
492    if (!TS_RESP_CTX_set_ess_cert_id_digest(ctx, cert_md))
493        goto err;
494
495    ret = 1;
496err:
497    return ret;
498}
499