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From 108d3fd58e16428316dae4a4c0601633d2903a4b Mon Sep 17 00:00:00 2001
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From: Sumit Bose <sbose@redhat.com>
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Date: Wed, 1 Nov 2017 17:14:05 +0100
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Subject: [PATCH 4/4] Handle kvno increment for RODCs
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Since the actual password change does not happen on the read-only domain
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controller (RODC) the kvno change has to be replicated back which might
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take some time. So we check the kvno before and after the change if we
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are connected to a RODC and increment the kvno if needed.
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---
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library/adenroll.c | 31 +++++++++++++++++++++++++++++++
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1 file changed, 31 insertions(+)
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diff --git a/library/adenroll.c b/library/adenroll.c
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index a15e4be..40c3920 100644
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--- a/library/adenroll.c
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+++ b/library/adenroll.c
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@@ -1633,8 +1633,30 @@ enroll_join_or_update_tasks (adcli_enroll *enroll,
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adcli_enroll_flags flags)
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{
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adcli_result res;
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+ krb5_kvno old_kvno = -1;
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if (!(flags & ADCLI_ENROLL_PASSWORD_VALID)) {
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+
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+ /* Handle kvno changes for read-only domain controllers
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+ * (RODC). Since the actual password change does not happen on
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+ * the RODC the kvno change has to be replicated back which
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+ * might take some time. So we check the kvno before and after
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+ * the change if we are connected to a RODC and increment the
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+ * kvno if needed. */
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+ if (!adcli_conn_is_writeable (enroll->conn)) {
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+ if (enroll->computer_attributes == NULL) {
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+ res = retrieve_computer_account (enroll);
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+ if (res != ADCLI_SUCCESS)
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+ return res;
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+ }
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+ old_kvno = adcli_enroll_get_kvno (enroll);
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+ _adcli_info ("Found old kvno '%d'", old_kvno);
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+
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+ ldap_msgfree (enroll->computer_attributes);
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+ enroll->computer_attributes = NULL;
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+ adcli_enroll_set_kvno (enroll, 0);
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+ }
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+
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res = set_computer_password (enroll);
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if (res != ADCLI_SUCCESS)
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return res;
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@@ -1651,6 +1673,15 @@ enroll_join_or_update_tasks (adcli_enroll *enroll,
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return res;
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}
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+ /* Handle kvno changes for read-only domain controllers (RODC) */
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+ if (!adcli_conn_is_writeable (enroll->conn) && old_kvno != -1 &&
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+ adcli_enroll_get_kvno (enroll) != 0 &&
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+ adcli_enroll_get_kvno (enroll) == old_kvno) {
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+ enroll->kvno++;
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+ _adcli_info ("No kvno change detected on read-only DC, kvno "
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+ "will be incremented by 1 to '%d'", enroll->kvno);
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+ }
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+
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/* We ignore failures of setting these fields */
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update_and_calculate_enctypes (enroll);
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update_computer_account (enroll);
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--
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2.13.6
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