From 21460dfc14acdeef69b6cd910da80f261316be63 Mon Sep 17 00:00:00 2001
From: Andrew Bartlett <abartlet@samba.org>
Date: Sat, 2 Oct 2010 16:32:56 +1000
Subject: s4:heimdal: import lorikeet-heimdal-201010022046 (commit
 1bea031b9404b14114b0272ecbe56e60c567af5c)

---
 source4/heimdal/lib/asn1/der_locl.h |  1 +
 source4/heimdal/lib/asn1/der_put.c  | 12 +++----
 source4/heimdal/lib/asn1/timegm.c   | 62 +++++++++++++++++++++++++++++++------
 3 files changed, 60 insertions(+), 15 deletions(-)

(limited to 'source4/heimdal/lib/asn1')

diff --git a/source4/heimdal/lib/asn1/der_locl.h b/source4/heimdal/lib/asn1/der_locl.h
index 0f65c50a22..a086e18fa4 100644
--- a/source4/heimdal/lib/asn1/der_locl.h
+++ b/source4/heimdal/lib/asn1/der_locl.h
@@ -56,6 +56,7 @@
 #include "asn1-template.h"
 
 time_t _der_timegm (struct tm *);
+struct tm * _der_gmtime(time_t t, struct tm *);
 size_t _heim_len_unsigned (unsigned);
 size_t _heim_len_int (int);
 
diff --git a/source4/heimdal/lib/asn1/der_put.c b/source4/heimdal/lib/asn1/der_put.c
index c8192f25fe..b8101458ad 100644
--- a/source4/heimdal/lib/asn1/der_put.c
+++ b/source4/heimdal/lib/asn1/der_put.c
@@ -426,22 +426,22 @@ der_put_length_and_tag (unsigned char *p, size_t len, size_t len_val,
 int
 _heim_time2generalizedtime (time_t t, heim_octet_string *s, int gtimep)
 {
-     struct tm *tm;
+     struct tm tm;
      const size_t len = gtimep ? 15 : 13;
 
      s->data = malloc(len + 1);
      if (s->data == NULL)
 	 return ENOMEM;
      s->length = len;
-     tm = gmtime (&t);
+     _der_gmtime(t, &tm);
      if (gtimep)
 	 snprintf (s->data, len + 1, "%04d%02d%02d%02d%02d%02dZ",
-		   tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
-		   tm->tm_hour, tm->tm_min, tm->tm_sec);
+		   tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
+		   tm.tm_hour, tm.tm_min, tm.tm_sec);
      else
 	 snprintf (s->data, len + 1, "%02d%02d%02d%02d%02d%02dZ",
-		   tm->tm_year % 100, tm->tm_mon + 1, tm->tm_mday,
-		   tm->tm_hour, tm->tm_min, tm->tm_sec);
+		   tm.tm_year % 100, tm.tm_mon + 1, tm.tm_mday,
+		   tm.tm_hour, tm.tm_min, tm.tm_sec);
 
      return 0;
 }
diff --git a/source4/heimdal/lib/asn1/timegm.c b/source4/heimdal/lib/asn1/timegm.c
index 83f0e33fb8..b569478413 100644
--- a/source4/heimdal/lib/asn1/timegm.c
+++ b/source4/heimdal/lib/asn1/timegm.c
@@ -42,6 +42,10 @@ is_leap(unsigned y)
     return (y % 4) == 0 && ((y % 100) != 0 || (y % 400) == 0);
 }
 
+static const unsigned ndays[2][12] ={
+    {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
+    {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}};
+
 /*
  * This is a simplifed version of timegm(3) that doesn't accept out of
  * bound values that timegm(3) normally accepts but those are not
@@ -51,9 +55,8 @@ is_leap(unsigned y)
 time_t
 _der_timegm (struct tm *tm)
 {
-  static const unsigned ndays[2][12] ={
-    {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
-    {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}};
+  time_t res = 0;
+  unsigned i;
 
   if (tm->tm_year < 0)
       return -1;
@@ -68,10 +71,51 @@ _der_timegm (struct tm *tm)
   if (tm->tm_sec < 0 || tm->tm_sec > 59)
       return -1;
 
-  /* now call to the libc timegm(). This code used to do the
-   * calculation itself, but that calculation didn't account for the
-   * difference between UTC and GMT, which is 24 seconds in 2010. That
-   * caused a mutual authentication failure
-   */
-  return timegm(tm);
+  for (i = 70; i < tm->tm_year; ++i)
+    res += is_leap(i) ? 366 : 365;
+
+  for (i = 0; i < tm->tm_mon; ++i)
+    res += ndays[is_leap(tm->tm_year)][i];
+  res += tm->tm_mday - 1;
+  res *= 24;
+  res += tm->tm_hour;
+  res *= 60;
+  res += tm->tm_min;
+  res *= 60;
+  res += tm->tm_sec;
+  return res;
+}
+
+struct tm *
+_der_gmtime(time_t t, struct tm *tm)
+{
+    time_t secday = t % (3600 * 24);
+    time_t days = t / (3600 * 24);
+
+    memset(tm, 0, sizeof(*tm));
+
+    tm->tm_sec = secday % 60;
+    tm->tm_min = (secday % 3600) / 60;
+    tm->tm_hour = secday / 3600;
+
+    tm->tm_year = 70;
+    while(1) {
+	unsigned dayinyear = (is_leap(tm->tm_year) ? 366 : 365);
+	if (days < dayinyear)
+	    break;
+	tm->tm_year += 1;
+	days -= dayinyear;
+    }
+    tm->tm_mon = 0;
+
+    while (1) {
+	unsigned daysinmonth = ndays[is_leap(tm->tm_year)][tm->tm_mon];
+	if (days < daysinmonth)
+	    break;
+	days -= daysinmonth;
+	tm->tm_mon++;
+    }
+    tm->tm_mday = days + 1;
+
+    return tm;
 }
-- 
cgit