[Bug 2891] New: authorized_keys does not accept RFC4716 format

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2891

            Bug ID: 2891
           Summary: authorized_keys does not accept RFC4716 format
           Product: Portable OpenSSH
           Version: 7.7p1
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: sshd
          Assignee: unassigned-bugs at mindrot.org
          Reporter: openssh at plonialmoni.33mail.com

I copied a public key in RFC4716 format into the authorized_keys file:

---- BEGIN SSH2 PUBLIC KEY ----
Comment: "rsa-key-20180731"
AAAAB3NzaC1yc2EAAAABJQAAAQEAkpDfVicjGj3lD+G73nU9IvTEZXrS9ckH1RKH
i1OfzqGjYF1EX6+8cMUc3pL+y0uKIIU1M+e9yDCrUSlWUIP8KSx0ng7G76yopN8J
F0mQFvmV6X8cyEmuZ0NhLXXZ2bJ/mgRgWEb1jF3jj1UMiR7/SO0knGpgO2S8EZxj
aFyDRcRzFfjj9KBcFgcTcaRAkamNz1ZUMdupb7Yk2f8tR3s6H1jONWRk3s0Gpfdf
yyd+KMLDZwR/ie5wZHl9SRZ5Z8sGOhpERaauJuhC5rz+Go3zq0TuWdkCr6QsRv3w
JPn70onI5LfS1dijS3du+SXz7RWifFj0rsOJKk3Z9MrBoDUnZw==
---- END SSH2 PUBLIC KEY ----

but ssh did not recognize this format when attempting to log in. Only
when I changed it to OpenSSH's single line format did it work:

ssh-rsa
AAAAB3NzaC1yc2EAAAABJQAAAQEAkpDfVicjGj3lD+G73nU9IvTEZXrS9ckH1RKHi1OfzqGjYF1EX6+8cMUc3pL+y0uKIIU1M+e9yDCrUSlWUIP8KSx0ng7G76yopN8JF0mQFvmV6X8cyEmuZ0NhLXXZ2bJ/mgRgWEb1jF3jj1UMiR7/SO0knGpgO2S8EZxjaFyDRcRzFfjj9KBcFgcTcaRAkamNz1ZUMdupb7Yk2f8tR3s6H1jONWRk3s0Gpfdfyyd+KMLDZwR/ie5wZHl9SRZ5Z8sGOhpERaauJuhC5rz+Go3zq0TuWdkCr6QsRv3wJPn70onI5LfS1dijS3du+SXz7RWifFj0rsOJKk3Z9MrBoDUnZw==

I think OpenSSH should support the use of the RFC4716 format in the
authorized_keys file.

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