Merge branch 'bug5346_squashed' into maint-0.2.2

3 files changed, 77 insertions, 10 deletions

diff --git a/changes/bug5346 b/changes/bug5346
new file mode 100644
index 000000000..3d21f9014
--- /dev/null
+++ b/changes/bug5346
@@ -0,0 +1,8 @@
+  o Minor bugfixes:
+    - Correct parsing of certain date types in parse_http_time().
+      Without this patch, If-Modified-Since would behave
+      incorrectly. Fix for bug 5346; bugfix on 0.2.0.2-alpha. Patch from
+      Esteban Manchado Velázques.
+    - Reject out-of-range times like 23:59:61. Fix for bug 5346;
+      bugfix on 0.0.8pre3.
+
diff --git a/src/common/util.c b/src/common/util.c
index 7d2fc4dea..a03a57632 100644
--- a/src/common/util.c
+++ b/src/common/util.c
@@ -1268,7 +1268,7 @@ format_rfc1123_time(char *buf, time_t t)
   tor_assert(tm.tm_wday >= 0);
   tor_assert(tm.tm_wday <= 6);
   memcpy(buf, WEEKDAY_NAMES[tm.tm_wday], 3);
-  tor_assert(tm.tm_wday >= 0);
+  tor_assert(tm.tm_mon >= 0);
   tor_assert(tm.tm_mon <= 11);
   memcpy(buf+8, MONTH_NAMES[tm.tm_mon], 3);
 }
@@ -1298,7 +1298,8 @@ parse_rfc1123_time(const char *buf, time_t *t)
     tor_free(esc);
     return -1;
   }
-  if (tm_mday > 31 || tm_hour > 23 || tm_min > 59 || tm_sec > 61) {
+  if (tm_mday < 1 || tm_mday > 31 || tm_hour > 23 || tm_min > 59 ||
+      tm_sec > 60) {
     char *esc = esc_for_log(buf);
     log_warn(LD_GENERAL, "Got invalid RFC1123 time %s", esc);
     tor_free(esc);
@@ -1368,7 +1369,7 @@ int
 parse_iso_time(const char *cp, time_t *t)
 {
   struct tm st_tm;
-  unsigned int year=0, month=0, day=0, hour=100, minute=100, second=100;
+  unsigned int year=0, month=0, day=0, hour=0, minute=0, second=0;
   if (tor_sscanf(cp, "%u-%2u-%2u %2u:%2u:%2u", &year, &month,
                 &day, &hour, &minute, &second) < 6) {
     char *esc = esc_for_log(cp);
@@ -1377,7 +1378,7 @@ parse_iso_time(const char *cp, time_t *t)
     return -1;
   }
   if (year < 1970 || month < 1 || month > 12 || day < 1 || day > 31 ||
-          hour > 23 || minute > 59 || second > 61) {
+          hour > 23 || minute > 59 || second > 60) {
     char *esc = esc_for_log(cp);
     log_warn(LD_GENERAL, "ISO time %s was nonsensical", esc);
     tor_free(esc);
@@ -1417,12 +1418,15 @@ parse_http_time(const char *date, struct tm *tm)
   /* First, try RFC1123 or RFC850 format: skip the weekday.  */
   if ((cp = strchr(date, ','))) {
     ++cp;
-    if (tor_sscanf(date, "%2u %3s %4u %2u:%2u:%2u GMT",
+    if (*cp != ' ')
+      return -1;
+    ++cp;
+    if (tor_sscanf(cp, "%2u %3s %4u %2u:%2u:%2u GMT",
                &tm_mday, month, &tm_year,
                &tm_hour, &tm_min, &tm_sec) == 6) {
       /* rfc1123-date */
       tm_year -= 1900;
-    } else if (tor_sscanf(date, "%2u-%3s-%2u %2u:%2u:%2u GMT",
+    } else if (tor_sscanf(cp, "%2u-%3s-%2u %2u:%2u:%2u GMT",
                       &tm_mday, month, &tm_year,
                       &tm_hour, &tm_min, &tm_sec) == 6) {
       /* rfc850-date */
@@ -1447,18 +1451,20 @@ parse_http_time(const char *date, struct tm *tm)
 
   month[3] = '\0';
   /* Okay, now decode the month. */
+  /* set tm->tm_mon to dummy value so the check below fails. */
+  tm->tm_mon = -1;
   for (i = 0; i < 12; ++i) {
     if (!strcasecmp(MONTH_NAMES[i], month)) {
-      tm->tm_mon = i+1;
+      tm->tm_mon = i;
     }
   }
 
   if (tm->tm_year < 0 ||
-      tm->tm_mon < 1  || tm->tm_mon > 12 ||
-      tm->tm_mday < 0 || tm->tm_mday > 31 ||
+      tm->tm_mon < 0  || tm->tm_mon > 11 ||
+      tm->tm_mday < 1 || tm->tm_mday > 31 ||
       tm->tm_hour < 0 || tm->tm_hour > 23 ||
       tm->tm_min < 0  || tm->tm_min > 59 ||
-      tm->tm_sec < 0  || tm->tm_sec > 61)
+      tm->tm_sec < 0  || tm->tm_sec > 60)
     return -1; /* Out of range, or bad month. */
 
   return 0;
diff --git a/src/test/test_util.c b/src/test/test_util.c
index ee745c5cf..cc0181c92 100644
--- a/src/test/test_util.c
+++ b/src/test/test_util.c
@@ -87,6 +87,58 @@ test_util_time(void)
 }
 
 static void
+test_util_parse_http_time(void *arg)
+{
+  struct tm a_time;
+
+  (void)arg;
+
+  /* Test parse_http_time */
+
+  test_eq(-1, parse_http_time("", &a_time));
+  test_eq(-1, parse_http_time("Sunday, 32 Aug 2004 00:48:22 GMT", &a_time));
+  test_eq(-1, parse_http_time("Sunday, 3 Aug 1869 00:48:22 GMT", &a_time));
+  test_eq(-1, parse_http_time("Sunday, 32-Aug-94 00:48:22 GMT", &a_time));
+  test_eq(-1, parse_http_time("Sunday, 3-Ago-04 00:48:22", &a_time));
+  test_eq(-1, parse_http_time("Sunday, August the third", &a_time));
+  test_eq(-1, parse_http_time("Wednesday,,04 Aug 1994 00:48:22 GMT", &a_time));
+
+  test_eq(0, parse_http_time("Wednesday, 04 Aug 1994 00:48:22 GMT", &a_time));
+  test_eq((time_t)775961302UL, tor_timegm(&a_time));
+  test_eq(0, parse_http_time("Wednesday, 4 Aug 1994 0:48:22 GMT", &a_time));
+  test_eq((time_t)775961302UL, tor_timegm(&a_time));
+  test_eq(0, parse_http_time("Miercoles, 4 Aug 1994 0:48:22 GMT", &a_time));
+  test_eq((time_t)775961302UL, tor_timegm(&a_time));
+  test_eq(0, parse_http_time("Wednesday, 04-Aug-94 00:48:22 GMT", &a_time));
+  test_eq((time_t)775961302UL, tor_timegm(&a_time));
+  test_eq(0, parse_http_time("Wednesday, 4-Aug-94 0:48:22 GMT", &a_time));
+  test_eq((time_t)775961302UL, tor_timegm(&a_time));
+  test_eq(0, parse_http_time("Miercoles, 4-Aug-94 0:48:22 GMT", &a_time));
+  test_eq((time_t)775961302UL, tor_timegm(&a_time));
+  test_eq(0, parse_http_time("Wed Aug 04 00:48:22 1994", &a_time));
+  test_eq((time_t)775961302UL, tor_timegm(&a_time));
+  test_eq(0, parse_http_time("Wed Aug 4 0:48:22 1994", &a_time));
+  test_eq((time_t)775961302UL, tor_timegm(&a_time));
+  test_eq(0, parse_http_time("Mie Aug 4 0:48:22 1994", &a_time));
+  test_eq((time_t)775961302UL, tor_timegm(&a_time));
+  test_eq(0, parse_http_time("Sun, 1 Jan 2012 00:00:00 GMT", &a_time));
+  test_eq((time_t)1325376000UL, tor_timegm(&a_time));
+  test_eq(0, parse_http_time("Mon, 31 Dec 2012 00:00:00 GMT", &a_time));
+  test_eq((time_t)1356912000UL, tor_timegm(&a_time));
+  test_eq(-1, parse_http_time("2004-08-zz 99-99x99 GMT", &a_time));
+  test_eq(-1, parse_http_time("2011-03-32 00:00:00 GMT", &a_time));
+  test_eq(-1, parse_http_time("2011-03-30 24:00:00 GMT", &a_time));
+  test_eq(-1, parse_http_time("2011-03-30 23:60:00 GMT", &a_time));
+  test_eq(-1, parse_http_time("2011-03-30 23:59:62 GMT", &a_time));
+  test_eq(-1, parse_http_time("1969-03-30 23:59:59 GMT", &a_time));
+  test_eq(-1, parse_http_time("2011-00-30 23:59:59 GMT", &a_time));
+  test_eq(-1, parse_http_time("2011-03-30 23:59", &a_time));
+
+ done:
+  ;
+}
+
+static void
 test_util_config_line(void)
 {
   char buf[1024];
@@ -1314,6 +1366,7 @@ test_util_di_ops(void)
 
 struct testcase_t util_tests[] = {
   UTIL_LEGACY(time),
+  UTIL_TEST(parse_http_time, 0),
   UTIL_LEGACY(config_line),
   UTIL_LEGACY(strmisc),
   UTIL_LEGACY(pow2),