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s4:drsuapi:getncchanges: allow 0 reserved_usn reply
Azure AD will set reserved_usn to zero when we expect it to be the number we gave them. BUG: https://bugzilla.samba.org/show_bug.cgi?id=15701 Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz> Reviewed-by: Jennifer Sutton <josutton@catalyst.net.nz>
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@ -1,5 +0,0 @@
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^samba4.drs.getncchanges.python\(vampire_dc\).getncchanges.DrsReplicaSyncFakeAzureAdTests.test_repl_get_tgt_multivalued_links\(vampire_dc\)
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^samba4.drs.getncchanges.python\(vampire_dc\).getncchanges.DrsReplicaSyncFakeAzureAdTests.test_repl_integrity\(vampire_dc\)
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^samba4.drs.getncchanges.python\(vampire_dc\).getncchanges.DrsReplicaSyncFakeAzureAdTests.test_repl_integrity_link_attr\(vampire_dc\)
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^samba4.drs.getncchanges.python\(promoted_dc\).getncchanges.DrsReplicaSyncFakeAzureAdTests.test_repl_integrity\(promoted_dc\)
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^samba4.drs.getncchanges.python\(promoted_dc\).getncchanges.DrsReplicaSyncFakeAzureAdTests.test_repl_integrity_link_attr\(promoted_dc\)
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@ -3029,6 +3029,56 @@ allowed:
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ret = drsuapi_DsReplicaHighWaterMark_cmp(&getnc_state->last_hwm,
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&req10->highwatermark);
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if (ret != 0) {
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if (req10->highwatermark.reserved_usn == 0) {
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/*
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* Entra ID Connect / Azure AD is known to set
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* reserved_usn to zero in replies, when we
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* were expecting it to be returned unchanged
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* (it is supposed to be an opaque cookie).
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*
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* If the only difference is in the
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* reserved_usn, and it is 0 on the return, we
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* assume it is Azure AD and treat the
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* highwatermarks as equal.
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*/
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req10->highwatermark.reserved_usn =
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getnc_state->last_hwm.reserved_usn;
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ret = drsuapi_DsReplicaHighWaterMark_cmp(
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&getnc_state->last_hwm,
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&req10->highwatermark);
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/* put things as they were */
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req10->highwatermark.reserved_usn = 0;
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if (ret != 0) {
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/* we will start again */
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DBG_ERR("DsGetNCChanges 2nd replication "
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"on DN %s %s highwatermark "
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"(last_dn %s) after Azure AD "
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"reserved_usn adjustment\n",
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ldb_dn_get_linearized(
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getnc_state->ncRoot_dn),
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(ret > 0) ? "older" : "newer",
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ldb_dn_get_linearized(
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getnc_state->last_dn));
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TALLOC_FREE(getnc_state);
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b_state->getncchanges_full_repl_state =
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NULL;
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} else {
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/* log and continue as normal */
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DBG_NOTICE(
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"DsGetNCChanges 2nd replication "
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"on DN %s: highwatermark "
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"matches only after Azure AD "
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"reserved_usn adjustment "
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"(last_dn %s)\n",
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ldb_dn_get_linearized(
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getnc_state->ncRoot_dn),
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ldb_dn_get_linearized(
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getnc_state->last_dn));
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}
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} else {
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DBG_ERR("DsGetNCChanges 2nd replication "
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"on DN %s %s highwatermark "
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"(last_dn %s)\n",
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@ -3041,6 +3091,7 @@ allowed:
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b_state->getncchanges_full_repl_state = NULL;
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}
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}
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}
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/*
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* This is either a new replication cycle, or an extended
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