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[4.x] Fix caching_sha2_password auth over Unix domain sockets - #1759
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MySQL treats Unix domain socket connections as secure, expecting clear-text password exchange during full authentication. The client only checked `isSsl()` in `AuthenticationMySQLCommandBase`, falling back to RSA key exchange which MySQL 8.4.13+ no longer accepts over secure connections (Bug #39883040). Added `isUsingDomainSocket()` to `MySQLSocketConnection` to check the actual socket transport, so clear-text passwords are sent over domain sockets, consistent with SSL connections. Signed-off-by: Thomas Segismont <tsegismont@gmail.com> (cherry picked from commit 58117cc) Signed-off-by: Thomas Segismont <tsegismont@gmail.com>
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Backport of #1757 to
4.xCherry-picked commit: 58117cc