Comments - Introduction to State Snapshot Transfers (SSTs)
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If you wanted to try to print the unmasked value of wsrep_sst_auth with gdb, then it looks like you might need to print this sst_auth_real variable:
https://github.com/MariaDB/server/blob/54ffc4996a6b9ffd400177864c0b33b49b0c4bcf/sql/wsrep_sst.cc#L46