If a user account has been created with REQUIRE CIPHER option, the user can't login unless he sends it's client certificate to the server (which should be only mandatory for additional X509 checks like issuer or subject.
How to repeat:
grant select on test.* to ssl_user1@localhost require SSL;
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grant select on test.* to ssl_user2@localhost require cipher "DHE-RSA-AES256-SHA";
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flush privileges;
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mysql -ussl_user1 -h127.0.0.1 --ssl-cipher=DHE-RSA-AES256-SHA -e"SHOW session status LIKE 'ssl_cipher'";
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+---------------+-----------------------+
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| Variable_name | Value |
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+---------------+-----------------------+
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| Ssl_cipher | DHE-RSA-AES256-SHA256 |
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+---------------+-----------------------+
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mysql -ussl_user2 -h127.0.0.1 --ssl-cipher=DHE-RSA-AES256-SHA -e"SHOW session status LIKE 'ssl_cipher'";
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ERROR 1045 (28000): Access denied for user 'ssl_user2'@'localhost' (using password: NO)
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Fix attached
Bug
Major