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From 4d42f950965f16a9eb77444a99abe76a8b4ac12c Mon Sep 17 00:00:00 2001
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From: Greg Hudson <ghudson@mit.edu>
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Date: Mon, 24 Apr 2017 02:02:36 -0400
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Subject: [PATCH] Fix in_clock_skew() and use it in AS client code
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Add a context parameter to the in_clock_skew() macro so that it isn't
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implicitly relying on a local variable. Use it in
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get_in_tkt.c:verify_as_reply().
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(cherry picked from commit 28a07a6461bb443b7fa75cc5cb859ad0db4cbb5a)
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---
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src/lib/krb5/krb/gc_via_tkt.c | 2 +-
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src/lib/krb5/krb/get_in_tkt.c | 4 ++--
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src/lib/krb5/krb/int-proto.h | 3 ++-
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3 files changed, 5 insertions(+), 4 deletions(-)
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diff --git a/src/lib/krb5/krb/gc_via_tkt.c b/src/lib/krb5/krb/gc_via_tkt.c
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index 4c0a1a461..c85d8b8d8 100644
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--- a/src/lib/krb5/krb/gc_via_tkt.c
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+++ b/src/lib/krb5/krb/gc_via_tkt.c
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@@ -305,7 +305,7 @@ krb5int_process_tgs_reply(krb5_context context,
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goto cleanup;
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if (!in_cred->times.starttime &&
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- !in_clock_skew(dec_rep->enc_part2->times.starttime,
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+ !in_clock_skew(context, dec_rep->enc_part2->times.starttime,
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timestamp)) {
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retval = KRB5_KDCREP_SKEW;
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goto cleanup;
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diff --git a/src/lib/krb5/krb/get_in_tkt.c b/src/lib/krb5/krb/get_in_tkt.c
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index 54badbbc3..a058f5bd7 100644
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--- a/src/lib/krb5/krb/get_in_tkt.c
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+++ b/src/lib/krb5/krb/get_in_tkt.c
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@@ -287,8 +287,8 @@ verify_as_reply(krb5_context context,
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return retval;
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} else {
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if ((request->from == 0) &&
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- (labs(as_reply->enc_part2->times.starttime - time_now)
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- > context->clockskew))
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+ !in_clock_skew(context, as_reply->enc_part2->times.starttime,
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+ time_now))
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return (KRB5_KDCREP_SKEW);
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}
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return 0;
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diff --git a/src/lib/krb5/krb/int-proto.h b/src/lib/krb5/krb/int-proto.h
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index 6da74858e..44eca359f 100644
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--- a/src/lib/krb5/krb/int-proto.h
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+++ b/src/lib/krb5/krb/int-proto.h
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@@ -83,7 +83,8 @@ krb5int_construct_matching_creds(krb5_context context, krb5_flags options,
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krb5_creds *in_creds, krb5_creds *mcreds,
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krb5_flags *fields);
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-#define in_clock_skew(date, now) (labs((date)-(now)) < context->clockskew)
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+#define in_clock_skew(context, date, now) \
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+ (labs((date) - (now)) < (context)->clockskew)
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#define IS_TGS_PRINC(p) ((p)->length == 2 && \
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data_eq_string((p)->data[0], KRB5_TGS_NAME))
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