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Improve ASN1_TIME_print documentation and output

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This adds missing GMT indication when printing the local time as
it is converted to the UTC timezone before printing.

Also fixing the fractional seconds printing on EBCDIC platforms.

Fixes #26313

Reviewed-by: Todd Short <todd.short@me.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/26344)

(cherry picked from commit c81ff97866)
This commit is contained in:
Michael Baentsch 2025-01-08 12:57:28 +01:00 • committed by Tomas Mraz
parent ca27dcf9da
commit 0a08a5cc69
2 changed files with 31 additions and 32 deletions
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55
crypto/asn1/a_time.c
View file

@ -490,9 +490,9 @@ int ASN1_TIME_print_ex(BIO *bp, const ASN1_TIME *tm, unsigned long flags)
int ossl_asn1_time_print_ex(BIO *bp, const ASN1_TIME *tm, unsigned long flags)
{
char *v;
int gmt = 0, l;
int l;
struct tm stm;
const char upper_z = 0x5A, period = 0x2E;
const char period = 0x2E;
/* ossl_asn1_time_to_tm will check the time type */
if (!ossl_asn1_time_to_tm(&stm, tm))
@ -500,8 +500,6 @@ int ossl_asn1_time_print_ex(BIO *bp, const ASN1_TIME *tm, unsigned long flags)
l = tm->length;
v = (char *)tm->data;
if (v[l - 1] == upper_z)
gmt = 1;
if (tm->type == V_ASN1_GENERALIZEDTIME) {
char *f = NULL;
@ -512,39 +510,36 @@ int ossl_asn1_time_print_ex(BIO *bp, const ASN1_TIME *tm, unsigned long flags)
* 'fraction point' in a GeneralizedTime string.
*/
if (tm->length > 15 && v[14] == period) {
f = &v[14];
f_len = 1;
while (14 + f_len < l && ossl_ascii_isdigit(f[f_len]))
/* exclude the . itself */
f = &v[15];
f_len = 0;
while (15 + f_len < l && ossl_ascii_isdigit(f[f_len]))
++f_len;
}
if ((flags & ASN1_DTFLGS_TYPE_MASK) == ASN1_DTFLGS_ISO8601) {
return BIO_printf(bp, "%4d-%02d-%02d %02d:%02d:%02d%.*s%s",
if (f_len > 0) {
if ((flags & ASN1_DTFLGS_TYPE_MASK) == ASN1_DTFLGS_ISO8601) {
return BIO_printf(bp, "%4d-%02d-%02d %02d:%02d:%02d.%.*sZ",
stm.tm_year + 1900, stm.tm_mon + 1,
stm.tm_mday, stm.tm_hour,
stm.tm_min, stm.tm_sec, f_len, f) > 0;
} else {
return BIO_printf(bp, "%s %2d %02d:%02d:%02d.%.*s %d GMT",
_asn1_mon[stm.tm_mon], stm.tm_mday, stm.tm_hour,
stm.tm_min, stm.tm_sec, f_len, f,
stm.tm_year + 1900) > 0;
}
}
}
if ((flags & ASN1_DTFLGS_TYPE_MASK) == ASN1_DTFLGS_ISO8601) {
return BIO_printf(bp, "%4d-%02d-%02d %02d:%02d:%02dZ",
stm.tm_year + 1900, stm.tm_mon + 1,
stm.tm_mday, stm.tm_hour,
stm.tm_min, stm.tm_sec, f_len, f,
(gmt ? "Z" : "")) > 0;
}
else {
return BIO_printf(bp, "%s %2d %02d:%02d:%02d%.*s %d%s",
_asn1_mon[stm.tm_mon], stm.tm_mday, stm.tm_hour,
stm.tm_min, stm.tm_sec, f_len, f, stm.tm_year + 1900,
(gmt ? " GMT" : "")) > 0;
}
stm.tm_min, stm.tm_sec) > 0;
} else {
if ((flags & ASN1_DTFLGS_TYPE_MASK) == ASN1_DTFLGS_ISO8601) {
return BIO_printf(bp, "%4d-%02d-%02d %02d:%02d:%02d%s",
stm.tm_year + 1900, stm.tm_mon + 1,
stm.tm_mday, stm.tm_hour,
stm.tm_min, stm.tm_sec,
(gmt ? "Z" : "")) > 0;
}
else {
return BIO_printf(bp, "%s %2d %02d:%02d:%02d %d%s",
return BIO_printf(bp, "%s %2d %02d:%02d:%02d %d GMT",
_asn1_mon[stm.tm_mon], stm.tm_mday, stm.tm_hour,
stm.tm_min, stm.tm_sec, stm.tm_year + 1900,
(gmt ? " GMT" : "")) > 0;
}
stm.tm_min, stm.tm_sec, stm.tm_year + 1900) > 0;
}
}

8
doc/man3/ASN1_TIME_set.pod
View file

@ -102,8 +102,8 @@ functions check the syntax of the time structure I<s>.
The ASN1_TIME_print(), ASN1_UTCTIME_print() and ASN1_GENERALIZEDTIME_print()
functions print the time structure I<s> to BIO I<b> in human readable
format. It will be of the format MMM DD HH:MM:SS YYYY [GMT], for example
"Feb 3 00:55:52 2015 GMT", which does not include a newline.
format. It will be of the format MMM DD HH:MM:SS[.s*] YYYY GMT, for example
"Feb E<32>3 00:55:52 2015 GMT", which does not include a newline.
If the time structure has invalid format it prints out "Bad time value" and
returns an error. The output for generalized time may include a fractional part
following the second.
@ -179,6 +179,10 @@ starting with B<ASN1_UTCTIME> and B<ASN1_GENERALIZEDTIME> act only on that
specific time format. The functions starting with B<ASN1_TIME> will operate on
either format.
Users familiar with RFC822 should note that when specifying the flag
B<ASN1_DTFLGS_RFC822> the year will be formatted as documented above,
i.e., using 4 digits, not 2 as specified in RFC822.
=head1 BUGS
ASN1_TIME_print(), ASN1_UTCTIME_print() and ASN1_GENERALIZEDTIME_print() do