Attachment 3611 Details for Bug 3468 – Implement 'Z' suffix and raw hex seconds-since-epoch

[patch] Implement 'Z' suffix and raw hex seconds-since-epoch

bz3468.diff (text/plain), 8.06 KB, created by Damien Miller on 2022-08-10 17:32:45 AEST

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Creator: Damien Miller

Created: 2022-08-10 17:32:45 AEST

Size: 8.06 KB

patch

obsolete

>diff --git a/misc.c b/misc.c
>index a864b87..da8bb8d 100644
>--- a/misc.c
>+++ b/misc.c
>@@ -2299,15 +2299,26 @@ 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);
>@@ -2327,10 +2338,15 @@ parse_absolute_time(const char *s, uint64_t *tp)
> 	}
> 
> 	memset(&tm, 0, sizeof(tm));
>-	if (strptime(buf, fmt, &tm) == NULL)
>-		return SSH_ERR_INVALID_FORMAT;
>-	if ((tt = mktime(&tm)) < 0)
>+	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;
>diff --git a/ssh-keygen.1 b/ssh-keygen.1
>index 5f42981..f3e8d67 100644
>--- a/ssh-keygen.1
>+++ b/ssh-keygen.1
>@@ -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
>diff --git a/ssh-keygen.c b/ssh-keygen.c
>index f50d5ae..69775d4 100644
>--- a/ssh-keygen.c
>+++ b/ssh-keygen.c
>@@ -1893,6 +1893,21 @@ 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)
> {
>@@ -1915,8 +1930,8 @@ 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, ':');
>@@ -1928,6 +1943,8 @@ 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);
> 
>@@ -1935,6 +1952,8 @@ 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(from, &cert_valid_to);
> 	else if (parse_absolute_time(to, &cert_valid_to) != 0)
> 		fatal("Invalid to time \"%s\"", to);
> 
>diff --git a/sshd.8 b/sshd.8
>index b3684ca..5a7d14d 100644
>--- a/sshd.8
>+++ b/sshd.8
>@@ -506,8 +506,9 @@ 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

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Attachments on bug 3468: 3611 | 3612 | 3613