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From a503519533eb375a5ce1f7566bfc153aac980d87 Mon Sep 17 00:00:00 2001
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From: Petr Mensik <pemensik@redhat.com>
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Date: Fri, 9 Jul 2021 20:52:21 +0200
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Subject: [PATCH] Use proper entropy to initialize tsig keyname
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Random names used on GSS backed nsupdate can conflict in specific
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situations. That might include starting a lot of machines from
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containers, where they took all similar time to start. PID and timestamp
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would be similar and therefore randomness is quite low. Use entropy to
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generate more random identifier and reduce chance of conflict.
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---
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bin/nsupdate/nsupdate.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/bin/nsupdate/nsupdate.c b/bin/nsupdate/nsupdate.c
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index 458aa76..d9e5a2b 100644
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--- a/bin/nsupdate/nsupdate.c
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+++ b/bin/nsupdate/nsupdate.c
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@@ -2941,7 +2941,9 @@ start_gssrequest(dns_name_t *master) {
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keyname = dns_fixedname_initname(&fkname);
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- isc_random_get(&val;;
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+ result = isc_entropy_getdata(entropy, &val, sizeof(val), NULL, 0);
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+ if (result != ISC_R_SUCCESS)
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+ isc_random_get(&val;;
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result = isc_string_printf(mykeystr, sizeof(mykeystr), "%u.sig-%s",
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val, namestr);
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if (result != ISC_R_SUCCESS)
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--
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2.31.1
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