xref: /openssl/crypto/ts/ts_rsp_sign.c (revision 7ed6de99)
1 /*
2  * Copyright 2006-2024 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 #include "internal/e_os.h"
11 
12 #include <openssl/objects.h>
13 #include <openssl/ts.h>
14 #include <openssl/pkcs7.h>
15 #include <openssl/crypto.h>
16 #include "internal/cryptlib.h"
17 #include "internal/sizes.h"
18 #include "internal/time.h"
19 #include "crypto/ess.h"
20 #include "ts_local.h"
21 
22 DEFINE_STACK_OF_CONST(EVP_MD)
23 
24 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *, void *);
25 static int def_time_cb(struct TS_resp_ctx *, void *, long *sec, long *usec);
26 static int def_extension_cb(struct TS_resp_ctx *, X509_EXTENSION *, void *);
27 
28 static void ts_RESP_CTX_init(TS_RESP_CTX *ctx);
29 static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx);
30 static int ts_RESP_check_request(TS_RESP_CTX *ctx);
31 static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx);
32 static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx,
33                                             ASN1_OBJECT *policy);
34 static int ts_RESP_process_extensions(TS_RESP_CTX *ctx);
35 static int ts_RESP_sign(TS_RESP_CTX *ctx);
36 
37 static int ts_TST_INFO_content_new(PKCS7 *p7);
38 
39 static ASN1_GENERALIZEDTIME
40 *TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *, long, long,
41                                     unsigned);
42 
43 /* Default callback for response generation. */
def_serial_cb(struct TS_resp_ctx * ctx,void * data)44 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *ctx, void *data)
45 {
46     ASN1_INTEGER *serial = ASN1_INTEGER_new();
47 
48     if (serial == NULL)
49         goto err;
50     if (!ASN1_INTEGER_set(serial, 1))
51         goto err;
52     return serial;
53 
54  err:
55     ERR_raise(ERR_LIB_TS, ERR_R_ASN1_LIB);
56     TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
57                                 "Error during serial number generation.");
58     ASN1_INTEGER_free(serial);
59     return NULL;
60 }
61 
def_time_cb(struct TS_resp_ctx * ctx,void * data,long * sec,long * usec)62 static int def_time_cb(struct TS_resp_ctx *ctx, void *data,
63                        long *sec, long *usec)
64 {
65     OSSL_TIME t;
66     struct timeval tv;
67 
68     t = ossl_time_now();
69     if (ossl_time_is_zero(t)) {
70         ERR_raise(ERR_LIB_TS, TS_R_TIME_SYSCALL_ERROR);
71         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
72                                     "Time is not available.");
73         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
74         return 0;
75     }
76     tv = ossl_time_to_timeval(t);
77     *sec = (long int)tv.tv_sec;
78     *usec = (long int)tv.tv_usec;
79 
80     return 1;
81 }
82 
def_extension_cb(struct TS_resp_ctx * ctx,X509_EXTENSION * ext,void * data)83 static int def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext,
84                             void *data)
85 {
86     TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
87                                 "Unsupported extension.");
88     TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION);
89     return 0;
90 }
91 
92 /* TS_RESP_CTX management functions. */
93 
TS_RESP_CTX_new_ex(OSSL_LIB_CTX * libctx,const char * propq)94 TS_RESP_CTX *TS_RESP_CTX_new_ex(OSSL_LIB_CTX *libctx, const char *propq)
95 {
96     TS_RESP_CTX *ctx;
97 
98     if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL)
99         return NULL;
100 
101     if (propq != NULL) {
102         ctx->propq = OPENSSL_strdup(propq);
103         if (ctx->propq == NULL) {
104             OPENSSL_free(ctx);
105             return NULL;
106         }
107     }
108     ctx->libctx = libctx;
109     ctx->serial_cb = def_serial_cb;
110     ctx->time_cb = def_time_cb;
111     ctx->extension_cb = def_extension_cb;
112 
113     return ctx;
114 }
115 
TS_RESP_CTX_new(void)116 TS_RESP_CTX *TS_RESP_CTX_new(void)
117 {
118     return TS_RESP_CTX_new_ex(NULL, NULL);
119 }
120 
TS_RESP_CTX_free(TS_RESP_CTX * ctx)121 void TS_RESP_CTX_free(TS_RESP_CTX *ctx)
122 {
123     if (!ctx)
124         return;
125 
126     OPENSSL_free(ctx->propq);
127     X509_free(ctx->signer_cert);
128     EVP_PKEY_free(ctx->signer_key);
129     OSSL_STACK_OF_X509_free(ctx->certs);
130     sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free);
131     ASN1_OBJECT_free(ctx->default_policy);
132     sk_EVP_MD_free(ctx->mds);   /* No EVP_MD_free method exists. */
133     ASN1_INTEGER_free(ctx->seconds);
134     ASN1_INTEGER_free(ctx->millis);
135     ASN1_INTEGER_free(ctx->micros);
136     OPENSSL_free(ctx);
137 }
138 
TS_RESP_CTX_set_signer_cert(TS_RESP_CTX * ctx,X509 * signer)139 int TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer)
140 {
141     if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1) {
142         ERR_raise(ERR_LIB_TS, TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE);
143         return 0;
144     }
145     X509_free(ctx->signer_cert);
146     ctx->signer_cert = signer;
147     X509_up_ref(ctx->signer_cert);
148     return 1;
149 }
150 
TS_RESP_CTX_set_signer_key(TS_RESP_CTX * ctx,EVP_PKEY * key)151 int TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key)
152 {
153     EVP_PKEY_free(ctx->signer_key);
154     ctx->signer_key = key;
155     EVP_PKEY_up_ref(ctx->signer_key);
156 
157     return 1;
158 }
159 
TS_RESP_CTX_set_signer_digest(TS_RESP_CTX * ctx,const EVP_MD * md)160 int TS_RESP_CTX_set_signer_digest(TS_RESP_CTX *ctx, const EVP_MD *md)
161 {
162     ctx->signer_md = md;
163     return 1;
164 }
165 
TS_RESP_CTX_set_def_policy(TS_RESP_CTX * ctx,const ASN1_OBJECT * def_policy)166 int TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *def_policy)
167 {
168     ASN1_OBJECT_free(ctx->default_policy);
169     if ((ctx->default_policy = OBJ_dup(def_policy)) == NULL)
170         goto err;
171     return 1;
172  err:
173     ERR_raise(ERR_LIB_TS, ERR_R_OBJ_LIB);
174     return 0;
175 }
176 
TS_RESP_CTX_set_certs(TS_RESP_CTX * ctx,STACK_OF (X509)* certs)177 int TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs)
178 {
179     OSSL_STACK_OF_X509_free(ctx->certs);
180     ctx->certs = NULL;
181 
182     return certs == NULL || (ctx->certs = X509_chain_up_ref(certs)) != NULL;
183 }
184 
TS_RESP_CTX_add_policy(TS_RESP_CTX * ctx,const ASN1_OBJECT * policy)185 int TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *policy)
186 {
187     ASN1_OBJECT *copy = NULL;
188 
189     if (ctx->policies == NULL
190         && (ctx->policies = sk_ASN1_OBJECT_new_null()) == NULL) {
191         ERR_raise(ERR_LIB_TS, ERR_R_CRYPTO_LIB);
192         goto err;
193     }
194     if ((copy = OBJ_dup(policy)) == NULL) {
195         ERR_raise(ERR_LIB_TS, ERR_R_OBJ_LIB);
196         goto err;
197     }
198     if (!sk_ASN1_OBJECT_push(ctx->policies, copy)) {
199         ERR_raise(ERR_LIB_TS, ERR_R_CRYPTO_LIB);
200         goto err;
201     }
202 
203     return 1;
204  err:
205     ASN1_OBJECT_free(copy);
206     return 0;
207 }
208 
TS_RESP_CTX_add_md(TS_RESP_CTX * ctx,const EVP_MD * md)209 int TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md)
210 {
211     if (ctx->mds == NULL
212         && (ctx->mds = sk_EVP_MD_new_null()) == NULL)
213         goto err;
214     if (!sk_EVP_MD_push(ctx->mds, md))
215         goto err;
216 
217     return 1;
218  err:
219     ERR_raise(ERR_LIB_TS, ERR_R_CRYPTO_LIB);
220     return 0;
221 }
222 
223 #define TS_RESP_CTX_accuracy_free(ctx)          \
224         ASN1_INTEGER_free(ctx->seconds);        \
225         ctx->seconds = NULL;                    \
226         ASN1_INTEGER_free(ctx->millis);         \
227         ctx->millis = NULL;                     \
228         ASN1_INTEGER_free(ctx->micros);         \
229         ctx->micros = NULL;
230 
TS_RESP_CTX_set_accuracy(TS_RESP_CTX * ctx,int secs,int millis,int micros)231 int TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx,
232                              int secs, int millis, int micros)
233 {
234 
235     TS_RESP_CTX_accuracy_free(ctx);
236     if (secs
237         && ((ctx->seconds = ASN1_INTEGER_new()) == NULL
238             || !ASN1_INTEGER_set(ctx->seconds, secs)))
239         goto err;
240     if (millis
241         && ((ctx->millis = ASN1_INTEGER_new()) == NULL
242             || !ASN1_INTEGER_set(ctx->millis, millis)))
243         goto err;
244     if (micros
245         && ((ctx->micros = ASN1_INTEGER_new()) == NULL
246             || !ASN1_INTEGER_set(ctx->micros, micros)))
247         goto err;
248 
249     return 1;
250  err:
251     TS_RESP_CTX_accuracy_free(ctx);
252     ERR_raise(ERR_LIB_TS, ERR_R_ASN1_LIB);
253     return 0;
254 }
255 
TS_RESP_CTX_add_flags(TS_RESP_CTX * ctx,int flags)256 void TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags)
257 {
258     ctx->flags |= flags;
259 }
260 
TS_RESP_CTX_set_serial_cb(TS_RESP_CTX * ctx,TS_serial_cb cb,void * data)261 void TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data)
262 {
263     ctx->serial_cb = cb;
264     ctx->serial_cb_data = data;
265 }
266 
TS_RESP_CTX_set_time_cb(TS_RESP_CTX * ctx,TS_time_cb cb,void * data)267 void TS_RESP_CTX_set_time_cb(TS_RESP_CTX *ctx, TS_time_cb cb, void *data)
268 {
269     ctx->time_cb = cb;
270     ctx->time_cb_data = data;
271 }
272 
TS_RESP_CTX_set_extension_cb(TS_RESP_CTX * ctx,TS_extension_cb cb,void * data)273 void TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx,
274                                   TS_extension_cb cb, void *data)
275 {
276     ctx->extension_cb = cb;
277     ctx->extension_cb_data = data;
278 }
279 
TS_RESP_CTX_set_status_info(TS_RESP_CTX * ctx,int status,const char * text)280 int TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx,
281                                 int status, const char *text)
282 {
283     TS_STATUS_INFO *si = NULL;
284     ASN1_UTF8STRING *utf8_text = NULL;
285     int ret = 0;
286 
287     if ((si = TS_STATUS_INFO_new()) == NULL) {
288         ERR_raise(ERR_LIB_TS, ERR_R_TS_LIB);
289         goto err;
290     }
291     if (!ASN1_INTEGER_set(si->status, status)) {
292         ERR_raise(ERR_LIB_TS, ERR_R_ASN1_LIB);
293         goto err;
294     }
295     if (text) {
296         if ((utf8_text = ASN1_UTF8STRING_new()) == NULL
297             || !ASN1_STRING_set(utf8_text, text, strlen(text))) {
298             ERR_raise(ERR_LIB_TS, ERR_R_ASN1_LIB);
299             goto err;
300         }
301         if (si->text == NULL
302             && (si->text = sk_ASN1_UTF8STRING_new_null()) == NULL) {
303             ERR_raise(ERR_LIB_TS, ERR_R_CRYPTO_LIB);
304             goto err;
305         }
306         if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text)) {
307             ERR_raise(ERR_LIB_TS, ERR_R_CRYPTO_LIB);
308             goto err;
309         }
310         utf8_text = NULL;       /* Ownership is lost. */
311     }
312     if (!TS_RESP_set_status_info(ctx->response, si)) {
313         ERR_raise(ERR_LIB_TS, ERR_R_TS_LIB);
314         goto err;
315     }
316     ret = 1;
317  err:
318     TS_STATUS_INFO_free(si);
319     ASN1_UTF8STRING_free(utf8_text);
320     return ret;
321 }
322 
TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX * ctx,int status,const char * text)323 int TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx,
324                                      int status, const char *text)
325 {
326     int ret = 1;
327     TS_STATUS_INFO *si = ctx->response->status_info;
328 
329     if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED) {
330         ret = TS_RESP_CTX_set_status_info(ctx, status, text);
331     }
332     return ret;
333 }
334 
TS_RESP_CTX_add_failure_info(TS_RESP_CTX * ctx,int failure)335 int TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure)
336 {
337     TS_STATUS_INFO *si = ctx->response->status_info;
338     if (si->failure_info == NULL
339         && (si->failure_info = ASN1_BIT_STRING_new()) == NULL)
340         goto err;
341     if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1))
342         goto err;
343     return 1;
344  err:
345     ERR_raise(ERR_LIB_TS, ERR_R_ASN1_LIB);
346     return 0;
347 }
348 
TS_RESP_CTX_get_request(TS_RESP_CTX * ctx)349 TS_REQ *TS_RESP_CTX_get_request(TS_RESP_CTX *ctx)
350 {
351     return ctx->request;
352 }
353 
TS_RESP_CTX_get_tst_info(TS_RESP_CTX * ctx)354 TS_TST_INFO *TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx)
355 {
356     return ctx->tst_info;
357 }
358 
TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX * ctx,unsigned precision)359 int TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx,
360                                            unsigned precision)
361 {
362     if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
363         return 0;
364     ctx->clock_precision_digits = precision;
365     return 1;
366 }
367 
368 /* Main entry method of the response generation. */
TS_RESP_create_response(TS_RESP_CTX * ctx,BIO * req_bio)369 TS_RESP *TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio)
370 {
371     ASN1_OBJECT *policy;
372     TS_RESP *response;
373     int result = 0;
374 
375     ts_RESP_CTX_init(ctx);
376 
377     if ((ctx->response = TS_RESP_new()) == NULL) {
378         ERR_raise(ERR_LIB_TS, ERR_R_TS_LIB);
379         goto end;
380     }
381     if ((ctx->request = d2i_TS_REQ_bio(req_bio, NULL)) == NULL) {
382         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
383                                     "Bad request format or system error.");
384         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
385         goto end;
386     }
387     if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL))
388         goto end;
389     if (!ts_RESP_check_request(ctx))
390         goto end;
391     if ((policy = ts_RESP_get_policy(ctx)) == NULL)
392         goto end;
393     if ((ctx->tst_info = ts_RESP_create_tst_info(ctx, policy)) == NULL)
394         goto end;
395     if (!ts_RESP_process_extensions(ctx))
396         goto end;
397     if (!ts_RESP_sign(ctx))
398         goto end;
399     result = 1;
400 
401  end:
402     if (!result) {
403         ERR_raise(ERR_LIB_TS, TS_R_RESPONSE_SETUP_ERROR);
404         if (ctx->response != NULL) {
405             if (TS_RESP_CTX_set_status_info_cond(ctx,
406                                                  TS_STATUS_REJECTION,
407                                                  "Error during response "
408                                                  "generation.") == 0) {
409                 TS_RESP_free(ctx->response);
410                 ctx->response = NULL;
411             }
412         }
413     }
414     response = ctx->response;
415     ctx->response = NULL;       /* Ownership will be returned to caller. */
416     ts_RESP_CTX_cleanup(ctx);
417     return response;
418 }
419 
420 /* Initializes the variable part of the context. */
ts_RESP_CTX_init(TS_RESP_CTX * ctx)421 static void ts_RESP_CTX_init(TS_RESP_CTX *ctx)
422 {
423     ctx->request = NULL;
424     ctx->response = NULL;
425     ctx->tst_info = NULL;
426 }
427 
428 /* Cleans up the variable part of the context. */
ts_RESP_CTX_cleanup(TS_RESP_CTX * ctx)429 static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx)
430 {
431     TS_REQ_free(ctx->request);
432     ctx->request = NULL;
433     TS_RESP_free(ctx->response);
434     ctx->response = NULL;
435     TS_TST_INFO_free(ctx->tst_info);
436     ctx->tst_info = NULL;
437 }
438 
439 /* Checks the format and content of the request. */
ts_RESP_check_request(TS_RESP_CTX * ctx)440 static int ts_RESP_check_request(TS_RESP_CTX *ctx)
441 {
442     TS_REQ *request = ctx->request;
443     TS_MSG_IMPRINT *msg_imprint;
444     X509_ALGOR *md_alg;
445     char md_alg_name[OSSL_MAX_NAME_SIZE];
446     const ASN1_OCTET_STRING *digest;
447     const EVP_MD *md = NULL;
448     int i, md_size;
449 
450     if (TS_REQ_get_version(request) != 1) {
451         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
452                                     "Bad request version.");
453         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST);
454         return 0;
455     }
456 
457     msg_imprint = request->msg_imprint;
458     md_alg = msg_imprint->hash_algo;
459     OBJ_obj2txt(md_alg_name, sizeof(md_alg_name), md_alg->algorithm, 0);
460     for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i) {
461         const EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i);
462         if (EVP_MD_is_a(current_md, md_alg_name))
463             md = current_md;
464     }
465     if (!md) {
466         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
467                                     "Message digest algorithm is "
468                                     "not supported.");
469         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
470         return 0;
471     }
472 
473     md_size = EVP_MD_get_size(md);
474     if (md_size <= 0)
475         return 0;
476 
477     if (md_alg->parameter && ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL) {
478         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
479                                     "Superfluous message digest "
480                                     "parameter.");
481         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
482         return 0;
483     }
484     digest = msg_imprint->hashed_msg;
485     if (digest->length != md_size) {
486         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
487                                     "Bad message digest.");
488         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
489         return 0;
490     }
491 
492     return 1;
493 }
494 
495 /* Returns the TSA policy based on the requested and acceptable policies. */
ts_RESP_get_policy(TS_RESP_CTX * ctx)496 static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx)
497 {
498     ASN1_OBJECT *requested = ctx->request->policy_id;
499     ASN1_OBJECT *policy = NULL;
500     int i;
501 
502     if (ctx->default_policy == NULL) {
503         ERR_raise(ERR_LIB_TS, TS_R_INVALID_NULL_POINTER);
504         return NULL;
505     }
506     if (!requested || !OBJ_cmp(requested, ctx->default_policy))
507         policy = ctx->default_policy;
508 
509     /* Check if the policy is acceptable. */
510     for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i) {
511         ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i);
512         if (!OBJ_cmp(requested, current))
513             policy = current;
514     }
515     if (policy == NULL) {
516         ERR_raise(ERR_LIB_TS, TS_R_UNACCEPTABLE_POLICY);
517         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
518                                     "Requested policy is not " "supported.");
519         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY);
520     }
521     return policy;
522 }
523 
524 /* Creates the TS_TST_INFO object based on the settings of the context. */
ts_RESP_create_tst_info(TS_RESP_CTX * ctx,ASN1_OBJECT * policy)525 static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx,
526                                             ASN1_OBJECT *policy)
527 {
528     int result = 0;
529     TS_TST_INFO *tst_info = NULL;
530     ASN1_INTEGER *serial = NULL;
531     ASN1_GENERALIZEDTIME *asn1_time = NULL;
532     long sec, usec;
533     TS_ACCURACY *accuracy = NULL;
534     const ASN1_INTEGER *nonce;
535     GENERAL_NAME *tsa_name = NULL;
536 
537     if ((tst_info = TS_TST_INFO_new()) == NULL)
538         goto end;
539     if (!TS_TST_INFO_set_version(tst_info, 1))
540         goto end;
541     if (!TS_TST_INFO_set_policy_id(tst_info, policy))
542         goto end;
543     if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint))
544         goto end;
545     if ((serial = ctx->serial_cb(ctx, ctx->serial_cb_data)) == NULL
546         || !TS_TST_INFO_set_serial(tst_info, serial))
547         goto end;
548     if (!ctx->time_cb(ctx, ctx->time_cb_data, &sec, &usec)
549         || (asn1_time =
550             TS_RESP_set_genTime_with_precision(NULL, sec, usec,
551                                         ctx->clock_precision_digits)) == NULL
552         || !TS_TST_INFO_set_time(tst_info, asn1_time))
553         goto end;
554 
555     if ((ctx->seconds || ctx->millis || ctx->micros)
556         && (accuracy = TS_ACCURACY_new()) == NULL)
557         goto end;
558     if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds))
559         goto end;
560     if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis))
561         goto end;
562     if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros))
563         goto end;
564     if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy))
565         goto end;
566 
567     if ((ctx->flags & TS_ORDERING)
568         && !TS_TST_INFO_set_ordering(tst_info, 1))
569         goto end;
570 
571     if ((nonce = ctx->request->nonce) != NULL
572         && !TS_TST_INFO_set_nonce(tst_info, nonce))
573         goto end;
574 
575     if (ctx->flags & TS_TSA_NAME) {
576         if ((tsa_name = GENERAL_NAME_new()) == NULL)
577             goto end;
578         tsa_name->type = GEN_DIRNAME;
579         tsa_name->d.dirn =
580             X509_NAME_dup(X509_get_subject_name(ctx->signer_cert));
581         if (!tsa_name->d.dirn)
582             goto end;
583         if (!TS_TST_INFO_set_tsa(tst_info, tsa_name))
584             goto end;
585     }
586 
587     result = 1;
588  end:
589     if (!result) {
590         TS_TST_INFO_free(tst_info);
591         tst_info = NULL;
592         ERR_raise(ERR_LIB_TS, TS_R_TST_INFO_SETUP_ERROR);
593         TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
594                                          "Error during TSTInfo "
595                                          "generation.");
596     }
597     GENERAL_NAME_free(tsa_name);
598     TS_ACCURACY_free(accuracy);
599     ASN1_GENERALIZEDTIME_free(asn1_time);
600     ASN1_INTEGER_free(serial);
601 
602     return tst_info;
603 }
604 
605 /* Processing the extensions of the request. */
ts_RESP_process_extensions(TS_RESP_CTX * ctx)606 static int ts_RESP_process_extensions(TS_RESP_CTX *ctx)
607 {
608     STACK_OF(X509_EXTENSION) *exts = ctx->request->extensions;
609     int i;
610     int ok = 1;
611 
612     for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i) {
613         X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i);
614         /*
615          * The last argument was previously (void *)ctx->extension_cb,
616          * but ISO C doesn't permit converting a function pointer to void *.
617          * For lack of better information, I'm placing a NULL there instead.
618          * The callback can pick its own address out from the ctx anyway...
619          */
620         ok = (*ctx->extension_cb) (ctx, ext, NULL);
621     }
622 
623     return ok;
624 }
625 
626 /* Functions for signing the TS_TST_INFO structure of the context. */
ossl_ess_add1_signing_cert(PKCS7_SIGNER_INFO * si,const ESS_SIGNING_CERT * sc)627 static int ossl_ess_add1_signing_cert(PKCS7_SIGNER_INFO *si,
628                                       const ESS_SIGNING_CERT *sc)
629 {
630     ASN1_STRING *seq = NULL;
631     int len = i2d_ESS_SIGNING_CERT(sc, NULL);
632     unsigned char *p, *pp = OPENSSL_malloc(len);
633 
634     if (pp == NULL)
635         return 0;
636 
637     p = pp;
638     i2d_ESS_SIGNING_CERT(sc, &p);
639     if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) {
640         ASN1_STRING_free(seq);
641         OPENSSL_free(pp);
642         return 0;
643     }
644 
645     OPENSSL_free(pp);
646     return PKCS7_add_signed_attribute(si, NID_id_smime_aa_signingCertificate,
647                                       V_ASN1_SEQUENCE, seq);
648 }
649 
ossl_ess_add1_signing_cert_v2(PKCS7_SIGNER_INFO * si,const ESS_SIGNING_CERT_V2 * sc)650 static int ossl_ess_add1_signing_cert_v2(PKCS7_SIGNER_INFO *si,
651                                          const ESS_SIGNING_CERT_V2 *sc)
652 {
653     ASN1_STRING *seq = NULL;
654     int len = i2d_ESS_SIGNING_CERT_V2(sc, NULL);
655     unsigned char *p, *pp = OPENSSL_malloc(len);
656 
657     if (pp == NULL)
658         return 0;
659 
660     p = pp;
661     i2d_ESS_SIGNING_CERT_V2(sc, &p);
662     if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) {
663         ASN1_STRING_free(seq);
664         OPENSSL_free(pp);
665         return 0;
666     }
667 
668     OPENSSL_free(pp);
669     return PKCS7_add_signed_attribute(si, NID_id_smime_aa_signingCertificateV2,
670                                       V_ASN1_SEQUENCE, seq);
671 }
672 
ts_RESP_sign(TS_RESP_CTX * ctx)673 static int ts_RESP_sign(TS_RESP_CTX *ctx)
674 {
675     int ret = 0;
676     PKCS7 *p7 = NULL;
677     PKCS7_SIGNER_INFO *si;
678     STACK_OF(X509) *certs;      /* Certificates to include in sc. */
679     ESS_SIGNING_CERT_V2 *sc2 = NULL;
680     ESS_SIGNING_CERT *sc = NULL;
681     ASN1_OBJECT *oid;
682     BIO *p7bio = NULL;
683     int i;
684     EVP_MD *signer_md = NULL;
685 
686     if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) {
687         ERR_raise(ERR_LIB_TS, TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
688         goto err;
689     }
690 
691     if ((p7 = PKCS7_new_ex(ctx->libctx, ctx->propq)) == NULL) {
692         ERR_raise(ERR_LIB_TS, ERR_R_ASN1_LIB);
693         goto err;
694     }
695     if (!PKCS7_set_type(p7, NID_pkcs7_signed))
696         goto err;
697     if (!ASN1_INTEGER_set(p7->d.sign->version, 3))
698         goto err;
699 
700     if (ctx->request->cert_req) {
701         PKCS7_add_certificate(p7, ctx->signer_cert);
702         if (ctx->certs) {
703             for (i = 0; i < sk_X509_num(ctx->certs); ++i) {
704                 X509 *cert = sk_X509_value(ctx->certs, i);
705                 PKCS7_add_certificate(p7, cert);
706             }
707         }
708     }
709 
710     if (ctx->signer_md == NULL)
711         signer_md = EVP_MD_fetch(ctx->libctx, "SHA256", ctx->propq);
712     else if (EVP_MD_get0_provider(ctx->signer_md) == NULL)
713         signer_md = EVP_MD_fetch(ctx->libctx, EVP_MD_get0_name(ctx->signer_md),
714                                  ctx->propq);
715     else
716         signer_md = (EVP_MD *)ctx->signer_md;
717 
718     if ((si = PKCS7_add_signature(p7, ctx->signer_cert,
719                                   ctx->signer_key, signer_md)) == NULL) {
720         ERR_raise(ERR_LIB_TS, TS_R_PKCS7_ADD_SIGNATURE_ERROR);
721         goto err;
722     }
723 
724     oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
725     if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
726                                     V_ASN1_OBJECT, oid)) {
727         ERR_raise(ERR_LIB_TS, TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR);
728         goto err;
729     }
730 
731     certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL;
732     if (ctx->ess_cert_id_digest == NULL
733         || EVP_MD_is_a(ctx->ess_cert_id_digest, SN_sha1)) {
734         if ((sc = OSSL_ESS_signing_cert_new_init(ctx->signer_cert,
735                                                  certs, 0)) == NULL)
736             goto err;
737 
738         if (!ossl_ess_add1_signing_cert(si, sc)) {
739             ERR_raise(ERR_LIB_TS, TS_R_ESS_ADD_SIGNING_CERT_ERROR);
740             goto err;
741         }
742     } else {
743         sc2 = OSSL_ESS_signing_cert_v2_new_init(ctx->ess_cert_id_digest,
744                                                 ctx->signer_cert, certs, 0);
745         if (sc2 == NULL)
746             goto err;
747 
748         if (!ossl_ess_add1_signing_cert_v2(si, sc2)) {
749             ERR_raise(ERR_LIB_TS, TS_R_ESS_ADD_SIGNING_CERT_V2_ERROR);
750             goto err;
751         }
752     }
753 
754     if (!ts_TST_INFO_content_new(p7))
755         goto err;
756     if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) {
757         ERR_raise(ERR_LIB_TS, ERR_R_PKCS7_LIB);
758         goto err;
759     }
760     if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info)) {
761         ERR_raise(ERR_LIB_TS, TS_R_TS_DATASIGN);
762         goto err;
763     }
764     if (!PKCS7_dataFinal(p7, p7bio)) {
765         ERR_raise(ERR_LIB_TS, TS_R_TS_DATASIGN);
766         goto err;
767     }
768     TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info);
769     p7 = NULL;                  /* Ownership is lost. */
770     ctx->tst_info = NULL;       /* Ownership is lost. */
771 
772     ret = 1;
773  err:
774     if (signer_md != ctx->signer_md)
775         EVP_MD_free(signer_md);
776 
777     if (!ret)
778         TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
779                                          "Error during signature "
780                                          "generation.");
781     BIO_free_all(p7bio);
782     ESS_SIGNING_CERT_V2_free(sc2);
783     ESS_SIGNING_CERT_free(sc);
784     PKCS7_free(p7);
785     return ret;
786 }
787 
ts_TST_INFO_content_new(PKCS7 * p7)788 static int ts_TST_INFO_content_new(PKCS7 *p7)
789 {
790     PKCS7 *ret = NULL;
791     ASN1_OCTET_STRING *octet_string = NULL;
792 
793     /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */
794     if ((ret = PKCS7_new()) == NULL)
795         goto err;
796     if ((ret->d.other = ASN1_TYPE_new()) == NULL)
797         goto err;
798     ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
799     if ((octet_string = ASN1_OCTET_STRING_new()) == NULL)
800         goto err;
801     ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string);
802     octet_string = NULL;
803 
804     /* Add encapsulated content to signed PKCS7 structure. */
805     if (!PKCS7_set_content(p7, ret))
806         goto err;
807 
808     return 1;
809  err:
810     ASN1_OCTET_STRING_free(octet_string);
811     PKCS7_free(ret);
812     return 0;
813 }
814 
TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME * asn1_time,long sec,long usec,unsigned precision)815 static ASN1_GENERALIZEDTIME *TS_RESP_set_genTime_with_precision(
816         ASN1_GENERALIZEDTIME *asn1_time, long sec, long usec,
817         unsigned precision)
818 {
819     time_t time_sec = (time_t)sec;
820     struct tm *tm = NULL, tm_result;
821     char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS];
822     char *p = genTime_str;
823     char *p_end = genTime_str + sizeof(genTime_str);
824 
825     if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
826         goto err;
827 
828     if ((tm = OPENSSL_gmtime(&time_sec, &tm_result)) == NULL)
829         goto err;
830 
831     /*
832      * Put "genTime_str" in GeneralizedTime format.  We work around the
833      * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST
834      * NOT include fractional seconds") and OpenSSL related functions to
835      * meet the rfc3161 requirement: "GeneralizedTime syntax can include
836      * fraction-of-second details".
837      */
838     p += BIO_snprintf(p, p_end - p,
839                       "%04d%02d%02d%02d%02d%02d",
840                       tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
841                       tm->tm_hour, tm->tm_min, tm->tm_sec);
842     if (precision > 0) {
843         BIO_snprintf(p, 2 + precision, ".%06ld", usec);
844         p += strlen(p);
845 
846         /*
847          * To make things a bit harder, X.690 | ISO/IEC 8825-1 provides the
848          * following restrictions for a DER-encoding, which OpenSSL
849          * (specifically ASN1_GENERALIZEDTIME_check() function) doesn't
850          * support: "The encoding MUST terminate with a "Z" (which means
851          * "Zulu" time). The decimal point element, if present, MUST be the
852          * point option ".". The fractional-seconds elements, if present,
853          * MUST omit all trailing 0's; if the elements correspond to 0, they
854          * MUST be wholly omitted, and the decimal point element also MUST be
855          * omitted."
856          */
857         /*
858          * Remove trailing zeros. The dot guarantees the exit condition of
859          * this loop even if all the digits are zero.
860          */
861         while (*--p == '0')
862              continue;
863         if (*p != '.')
864             ++p;
865     }
866     *p++ = 'Z';
867     *p++ = '\0';
868 
869     if (asn1_time == NULL
870         && (asn1_time = ASN1_GENERALIZEDTIME_new()) == NULL)
871         goto err;
872     if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) {
873         ASN1_GENERALIZEDTIME_free(asn1_time);
874         goto err;
875     }
876     return asn1_time;
877 
878  err:
879     ERR_raise(ERR_LIB_TS, TS_R_COULD_NOT_SET_TIME);
880     return NULL;
881 }
882 
TS_RESP_CTX_set_ess_cert_id_digest(TS_RESP_CTX * ctx,const EVP_MD * md)883 int TS_RESP_CTX_set_ess_cert_id_digest(TS_RESP_CTX *ctx, const EVP_MD *md)
884 {
885     ctx->ess_cert_id_digest = md;
886     return 1;
887 }
888