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From 6437685130b68670888db1d0551f5464d56c4cec Mon Sep 17 00:00:00 2001
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From: Greg Hudson <ghudson@mit.edu>
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Date: Sat, 22 Apr 2017 09:49:12 -0400
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Subject: [PATCH] Add timestamp helper functions
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Add k5-int.h helper functions to manipulate krb5_timestamp values,
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avoiding undefined behavior and treating negative timestamp values as
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times between 2038 and 2106. Add a doxygen comment for krb5_timestamp
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indicating how third-party code should use it safely.
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ticket: 8352
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(cherry picked from commit 58e9155060cd93b1a7557e37fbc9b077b76465c2)
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---
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src/include/k5-int.h | 31 +++++++++++++++++++++++++++++++
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src/include/krb5/krb5.hin | 9 +++++++++
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2 files changed, 40 insertions(+)
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diff --git a/src/include/k5-int.h b/src/include/k5-int.h
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index 06ca2b66d..82ee20760 100644
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--- a/src/include/k5-int.h
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+++ b/src/include/k5-int.h
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@@ -2353,6 +2353,37 @@ k5memdup0(const void *in, size_t len, krb5_error_code *code)
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return ptr;
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}
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+/* Convert a krb5_timestamp to a time_t value, treating the negative range of
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+ * krb5_timestamp as times between 2038 and 2106 (if time_t is 64-bit). */
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+static inline time_t
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+ts2tt(krb5_timestamp timestamp)
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+{
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+ return (time_t)(uint32_t)timestamp;
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+}
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+
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+/* Return the delta between two timestamps (a - b) as a signed 32-bit value,
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+ * without relying on undefined behavior. */
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+static inline krb5_deltat
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+ts_delta(krb5_timestamp a, krb5_timestamp b)
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+{
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+ return (krb5_deltat)((uint32_t)a - (uint32_t)b);
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+}
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+
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+/* Increment a timestamp by a signed 32-bit interval, without relying on
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+ * undefined behavior. */
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+static inline krb5_timestamp
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+ts_incr(krb5_timestamp ts, krb5_deltat delta)
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+{
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+ return (krb5_timestamp)((uint32_t)ts + (uint32_t)delta);
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+}
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+
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+/* Return true if a comes after b. */
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+static inline krb5_boolean
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+ts_after(krb5_timestamp a, krb5_timestamp b)
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+{
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+ return (uint32_t)a > (uint32_t)b;
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+}
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+
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krb5_error_code KRB5_CALLCONV
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krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
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krb5_ccache ccache,
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diff --git a/src/include/krb5/krb5.hin b/src/include/krb5/krb5.hin
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index cf60d6c41..53ad85384 100644
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--- a/src/include/krb5/krb5.hin
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+++ b/src/include/krb5/krb5.hin
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@@ -187,7 +187,16 @@ typedef krb5_int32 krb5_cryptotype;
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typedef krb5_int32 krb5_preauthtype; /* This may change, later on */
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typedef krb5_int32 krb5_flags;
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+
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+/**
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+ * Represents a timestamp in seconds since the POSIX epoch. This legacy type
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+ * is used frequently in the ABI, but cannot represent timestamps after 2038 as
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+ * a positive number. Code which uses this type should cast values of it to
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+ * uint32_t so that negative values are treated as timestamps between 2038 and
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+ * 2106 on platforms with 64-bit time_t.
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+ */
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typedef krb5_int32 krb5_timestamp;
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+
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typedef krb5_int32 krb5_deltat;
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/**
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