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upstream: allow certificate validity intervals, sshsig verification 

times and authorized_keys expiry-time options to accept dates in the UTC time
zone in addition to the default of interpreting them in the system time zone.
YYYYMMDD and YYMMDDHHMM[SS] dates/times will be interpreted as UTC if
suffixed with a 'Z' character.

Also allow certificate validity intervals to be specified in raw
seconds-since-epoch as hex value, e.g. -V 0x1234:0x4567890. This
is intended for use by regress tests and other tools that call
ssh-keygen as part of a CA workflow.

bz3468 ok dtucker

OpenBSD-Commit-ID: 454db1cdffa9fa346aea5211223a2ce0588dfe13
This commit is contained in:
djm@openbsd.org 2022-08-11 01:56:51 +00:00 committed by Damien Miller
parent 4df246ec75
commit ec1ddb72a1
4 changed files with 113 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
misc.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: misc.c,v 1.176 2022/06/03 04:30:47 djm Exp $ */
/* $OpenBSD: misc.c,v 1.177 2022/08/11 01:56:51 djm Exp $ */
/*
* Copyright (c) 2000 Markus Friedl. All rights reserved.
* Copyright (c) 2005-2020 Damien Miller. All rights reserved.
@ -2399,15 +2399,26 @@ parse_absolute_time(const char *s, uint64_t *tp)
struct tm tm;
time_t tt;
char buf[32], *fmt;
const char *cp;
size_t l;
int is_utc = 0;
*tp = 0;
l = strlen(s);
if (l > 1 && strcasecmp(s + l - 1, "Z") == 0) {
is_utc = 1;
l--;
} else if (l > 3 && strcasecmp(s + l - 3, "UTC") == 0) {
is_utc = 1;
l -= 3;
}
/*
* POSIX strptime says "The application shall ensure that there
* is white-space or other non-alphanumeric characters between
* any two conversion specifications" so arrange things this way.
*/
switch (strlen(s)) {
switch (l) {
case 8: /* YYYYMMDD */
fmt = "%Y-%m-%d";
snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6);
@ -2427,10 +2438,15 @@ parse_absolute_time(const char *s, uint64_t *tp)
}
memset(&tm, 0, sizeof(tm));
if (strptime(buf, fmt, &tm) == NULL)
if ((cp = strptime(buf, fmt, &tm)) == NULL || *cp != '\0')
return SSH_ERR_INVALID_FORMAT;
if (is_utc) {
if ((tt = timegm(&tm)) < 0)
return SSH_ERR_INVALID_FORMAT;
} else {
if ((tt = mktime(&tm)) < 0)
return SSH_ERR_INVALID_FORMAT;
}
/* success */
*tp = (uint64_t)tt;
return 0;

88
ssh-keygen.1
View File

@ -1,4 +1,4 @@
.\" $OpenBSD: ssh-keygen.1,v 1.223 2022/06/03 03:17:42 dtucker Exp $
.\" $OpenBSD: ssh-keygen.1,v 1.224 2022/08/11 01:56:51 djm Exp $
.\"
.\" Author: Tatu Ylonen <ylo@cs.hut.fi>
.\" Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -35,7 +35,7 @@
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd $Mdocdate: June 3 2022 $
.Dd $Mdocdate: August 11 2022 $
.Dt SSH-KEYGEN 1
.Os
.Sh NAME
@ -511,8 +511,11 @@ Print the full public key to standard output after signature verification.
.It Cm verify-time Ns = Ns Ar timestamp
Specifies a time to use when validating signatures instead of the current
time.
The time may be specified as a date in YYYYMMDD format or a time
in YYYYMMDDHHMM[SS] format.
The time may be specified as a date or time in the YYYYMMDD[Z] or
in YYYYMMDDHHMM[SS][Z] formats.
Dates and times will be interpreted in the current system time zone unless
suffixed with a Z character, which causes them to be interpreted in the
UTC time zone.
.El
.Pp
The
@ -603,31 +606,67 @@ A validity interval may consist of a single time, indicating that the
certificate is valid beginning now and expiring at that time, or may consist
of two times separated by a colon to indicate an explicit time interval.
.Pp
The start time may be specified as the string
The start time may be specified as:
.Bl -bullet -compact
.It
The string
.Dq always
to indicate the certificate has no specified start time,
a date in YYYYMMDD format, a time in YYYYMMDDHHMM[SS] format,
a relative time (to the current time) consisting of a minus sign followed by
an interval in the format described in the
to indicate the certificate has no specified start time.
.It
A date or time in the system time zone formatted as YYYYMMDD or
YYYYMMDDHHMM[SS].
.It
A date or time in the UTC time zone as YYYYMMDDZ or YYYYMMDDHHMM[SS]Z.
.It
A relative time before the current system time consisting of a minus sign
followed by an interval in the format described in the
TIME FORMATS section of
.Xr sshd_config 5 .
.It
A raw seconds since epoch (Jan 1 1970 00:00:00 UTC) as a hexadecimal
number beginning with
.Dq 0x .
.El
.Pp
The end time may be specified as a YYYYMMDD date, a YYYYMMDDHHMM[SS] time,
a relative time starting with a plus character or the string
The end time may be specified similarly to the start time:
.Bl -bullet -compact
.It
The string
.Dq forever
to indicate that the certificate has no expiry date.
to indicate the certificate has no specified end time.
.It
A date or time in the system time zone formatted as YYYYMMDD or
YYYYMMDDHHMM[SS].
.It
A date or time in the UTC time zone as YYYYMMDDZ or YYYYMMDDHHMM[SS]Z.
.It
A relative time after the current system time consisting of a plus sign
followed by an interval in the format described in the
TIME FORMATS section of
.Xr sshd_config 5 .
.It
A raw seconds since epoch (Jan 1 1970 00:00:00 UTC) as a hexadecimal
number beginning with
.Dq 0x .
.El
.Pp
For example:
.Dq +52w1d
(valid from now to 52 weeks and one day from now),
.Dq -4w:+4w
(valid from four weeks ago to four weeks from now),
.Dq 20100101123000:20110101123000
(valid from 12:30 PM, January 1st, 2010 to 12:30 PM, January 1st, 2011),
.Dq -1d:20110101
(valid from yesterday to midnight, January 1st, 2011),
.Dq -1m:forever
(valid from one minute ago and never expiring).
.Bl -tag -width Ds
.It +52w1d
Valid from now to 52 weeks and one day from now.
.It -4w:+4w
Valid from four weeks ago to four weeks from now.
.It 20100101123000:20110101123000
Valid from 12:30 PM, January 1st, 2010 to 12:30 PM, January 1st, 2011.
.It 20100101123000Z:20110101123000Z
Similar, but interpreted in the UTC time zone rather than the system time zone.
.It -1d:20110101
Valid from yesterday to midnight, January 1st, 2011.
.It 0x1:0x2000000000
Valid from roughly early 1970 to May 2033.
.It -1m:forever
Valid from one minute ago and never expiring.
.El
.It Fl v
Verbose mode.
Causes
@ -1206,7 +1245,10 @@ signature object and presented on the verification command-line must
match the specified list before the key will be considered acceptable.
.It Cm valid-after Ns = Ns "timestamp"
Indicates that the key is valid for use at or after the specified timestamp,
which may be a date in YYYYMMDD format or a time in YYYYMMDDHHMM[SS] format.
which may be a date or time in the YYYYMMDD[Z] or YYYYMMDDHHMM[SS][Z] formats.
Dates and times will be interpreted in the current system time zone unless
suffixed with a Z character, which causes them to be interpreted in the UTC
time zone.
.It Cm valid-before Ns = Ns "timestamp"
Indicates that the key is valid for use at or before the specified timestamp.
.El

25
ssh-keygen.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: ssh-keygen.c,v 1.458 2022/08/05 05:01:40 djm Exp $ */
/* $OpenBSD: ssh-keygen.c,v 1.459 2022/08/11 01:56:51 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -1916,6 +1916,21 @@ parse_relative_time(const char *s, time_t now)
return now + (u_int64_t)(secs * mul);
}
static void
parse_hex_u64(const char *s, uint64_t *up)
{
char *ep;
unsigned long long ull;
errno = 0;
ull = strtoull(s, &ep, 16);
if (*s == '\0' || *ep != '\0')
fatal("Invalid certificate time: not a number");
if (errno == ERANGE && ull == ULONG_MAX)
fatal_fr(SSH_ERR_SYSTEM_ERROR, "Invalid certificate time");
*up = (uint64_t)ull;
}
static void
parse_cert_times(char *timespec)
{
@ -1938,8 +1953,8 @@ parse_cert_times(char *timespec)
/*
* from:to, where
* from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | "always"
* to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | "forever"
* from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | 0x... | "always"
* to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | 0x... | "forever"
*/
from = xstrdup(timespec);
to = strchr(from, ':');
@ -1951,6 +1966,8 @@ parse_cert_times(char *timespec)
cert_valid_from = parse_relative_time(from, now);
else if (strcmp(from, "always") == 0)
cert_valid_from = 0;
else if (strncmp(from, "0x", 2) == 0)
parse_hex_u64(from, &cert_valid_from);
else if (parse_absolute_time(from, &cert_valid_from) != 0)
fatal("Invalid from time \"%s\"", from);
@ -1958,6 +1975,8 @@ parse_cert_times(char *timespec)
cert_valid_to = parse_relative_time(to, now);
else if (strcmp(to, "forever") == 0)
cert_valid_to = ~(u_int64_t)0;
else if (strncmp(from, "0x", 2) == 0)
parse_hex_u64(to, &cert_valid_to);
else if (parse_absolute_time(to, &cert_valid_to) != 0)
fatal("Invalid to time \"%s\"", to);

9
sshd.8
View File

@ -33,8 +33,8 @@
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\" $OpenBSD: sshd.8,v 1.319 2022/05/02 05:40:37 jmc Exp $
.Dd $Mdocdate: May 2 2022 $
.\" $OpenBSD: sshd.8,v 1.320 2022/08/11 01:56:51 djm Exp $
.Dd $Mdocdate: August 11 2022 $
.Dt SSHD 8
.Os
.Sh NAME
@ -533,8 +533,9 @@ controlled via the
option.
.It Cm expiry-time="timespec"
Specifies a time after which the key will not be accepted.
The time may be specified as a YYYYMMDD date or a YYYYMMDDHHMM[SS] time
in the system time-zone.
The time may be specified as a YYYYMMDD[Z] date or a YYYYMMDDHHMM[SS][Z] time.
Dates and times will be interpreted in the system time zone unless suffixed
by a Z character, in which case they will be interpreted in the UTC time zone.
.It Cm from="pattern-list"
Specifies that in addition to public key authentication, either the canonical
name of the remote host or its IP address must be present in the