ref: 009439541d2c6e8af2596f8fb1b4df85861fd212
dir: /third_party/boringssl/src/crypto/asn1/a_time.c/
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* 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 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 acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS 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 AUTHOR OR 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.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.] */
#include <openssl/asn1.h>
#include <openssl/posix_time.h>
#include <string.h>
#include <time.h>
#include <openssl/asn1t.h>
#include <openssl/bytestring.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include "internal.h"
// This is an implementation of the ASN1 Time structure which is: Time ::=
// CHOICE { utcTime UTCTime, generalTime GeneralizedTime } written by Steve
// Henson.
IMPLEMENT_ASN1_MSTRING(ASN1_TIME, B_ASN1_TIME)
IMPLEMENT_ASN1_FUNCTIONS_const(ASN1_TIME)
ASN1_TIME *ASN1_TIME_set_posix(ASN1_TIME *s, int64_t posix_time) {
return ASN1_TIME_adj(s, posix_time, 0, 0);
}
ASN1_TIME *ASN1_TIME_set(ASN1_TIME *s, time_t time) {
return ASN1_TIME_adj(s, time, 0, 0);
}
static int fits_in_utc_time(const struct tm *tm) {
return 50 <= tm->tm_year && tm->tm_year < 150;
}
ASN1_TIME *ASN1_TIME_adj(ASN1_TIME *s, int64_t posix_time, int offset_day,
long offset_sec) {
struct tm tm;
if (!OPENSSL_posix_to_tm(posix_time, &tm)) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_ERROR_GETTING_TIME);
return NULL;
}
if (offset_day || offset_sec) {
if (!OPENSSL_gmtime_adj(&tm, offset_day, offset_sec)) {
return NULL;
}
}
if (fits_in_utc_time(&tm)) {
return ASN1_UTCTIME_adj(s, posix_time, offset_day, offset_sec);
}
return ASN1_GENERALIZEDTIME_adj(s, posix_time, offset_day, offset_sec);
}
int ASN1_TIME_check(const ASN1_TIME *t) {
if (t->type == V_ASN1_GENERALIZEDTIME) {
return ASN1_GENERALIZEDTIME_check(t);
} else if (t->type == V_ASN1_UTCTIME) {
return ASN1_UTCTIME_check(t);
}
return 0;
}
// Convert an ASN1_TIME structure to GeneralizedTime
ASN1_GENERALIZEDTIME *ASN1_TIME_to_generalizedtime(const ASN1_TIME *t,
ASN1_GENERALIZEDTIME **out) {
ASN1_GENERALIZEDTIME *ret = NULL;
char *str;
int newlen;
if (!ASN1_TIME_check(t)) {
return NULL;
}
if (!out || !*out) {
if (!(ret = ASN1_GENERALIZEDTIME_new())) {
goto err;
}
} else {
ret = *out;
}
// If already GeneralizedTime just copy across
if (t->type == V_ASN1_GENERALIZEDTIME) {
if (!ASN1_STRING_set(ret, t->data, t->length)) {
goto err;
}
goto done;
}
// grow the string
if (!ASN1_STRING_set(ret, NULL, t->length + 2)) {
goto err;
}
// ASN1_STRING_set() allocated 'len + 1' bytes.
newlen = t->length + 2 + 1;
str = (char *)ret->data;
// Work out the century and prepend
if (t->data[0] >= '5') {
OPENSSL_strlcpy(str, "19", newlen);
} else {
OPENSSL_strlcpy(str, "20", newlen);
}
OPENSSL_strlcat(str, (char *)t->data, newlen);
done:
if (out != NULL && *out == NULL) {
*out = ret;
}
return ret;
err:
if (out == NULL || *out != ret) {
ASN1_GENERALIZEDTIME_free(ret);
}
return NULL;
}
int ASN1_TIME_set_string(ASN1_TIME *s, const char *str) {
return ASN1_UTCTIME_set_string(s, str) ||
ASN1_GENERALIZEDTIME_set_string(s, str);
}
int ASN1_TIME_set_string_X509(ASN1_TIME *s, const char *str) {
CBS cbs;
CBS_init(&cbs, (const uint8_t*)str, strlen(str));
int type;
struct tm tm;
if (CBS_parse_utc_time(&cbs, /*out_tm=*/NULL,
/*allow_timezone_offset=*/0)) {
type = V_ASN1_UTCTIME;
} else if (CBS_parse_generalized_time(&cbs, &tm,
/*allow_timezone_offset=*/0)) {
type = V_ASN1_GENERALIZEDTIME;
if (fits_in_utc_time(&tm)) {
type = V_ASN1_UTCTIME;
CBS_skip(&cbs, 2);
}
} else {
return 0;
}
if (s != NULL) {
if (!ASN1_STRING_set(s, CBS_data(&cbs), CBS_len(&cbs))) {
return 0;
}
s->type = type;
}
return 1;
}
static int asn1_time_to_tm(struct tm *tm, const ASN1_TIME *t,
int allow_timezone_offset) {
if (t == NULL) {
if (OPENSSL_posix_to_tm(time(NULL), tm)) {
return 1;
}
return 0;
}
if (t->type == V_ASN1_UTCTIME) {
return asn1_utctime_to_tm(tm, t, allow_timezone_offset);
} else if (t->type == V_ASN1_GENERALIZEDTIME) {
return asn1_generalizedtime_to_tm(tm, t);
}
return 0;
}
int ASN1_TIME_diff(int *out_days, int *out_seconds, const ASN1_TIME *from,
const ASN1_TIME *to) {
struct tm tm_from, tm_to;
if (!asn1_time_to_tm(&tm_from, from, /*allow_timezone_offset=*/1)) {
return 0;
}
if (!asn1_time_to_tm(&tm_to, to, /*allow_timezone_offset=*/1)) {
return 0;
}
return OPENSSL_gmtime_diff(out_days, out_seconds, &tm_from, &tm_to);
}
// The functions below do *not* permissively allow the use of four digit
// timezone offsets in UTC times, as is done elsewhere in the code. They are
// both new API, and used internally to X509_cmp_time. This is to discourage the
// use of nonstandard times in new code, and to ensure that this code behaves
// correctly in X509_cmp_time which historically did its own time validations
// slightly different than the many other copies of X.509 time validation
// sprinkled through the codebase. The custom checks in X509_cmp_time meant that
// it did not allow four digit timezone offsets in UTC times.
int ASN1_TIME_to_time_t(const ASN1_TIME *t, time_t *out_time) {
struct tm tm;
if (!asn1_time_to_tm(&tm, t, /*allow_timezone_offset=*/0)) {
return 0;
}
return OPENSSL_timegm(&tm, out_time);
}
int ASN1_TIME_to_posix(const ASN1_TIME *t, int64_t *out_time) {
struct tm tm;
if (!asn1_time_to_tm(&tm, t, /*allow_timezone_offset=*/0)) {
return 0;
}
return OPENSSL_tm_to_posix(&tm, out_time);
}