[Bug 2846] New: PermitOpen rule in sshd_config is not case insensitive

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2846

            Bug ID: 2846
           Summary: PermitOpen rule in sshd_config is not case insensitive
           Product: Portable OpenSSH
           Version: 7.6p1
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: major
          Priority: P5
         Component: sshd
          Assignee: unassigned-bugs at mindrot.org
          Reporter: paebbels at gmail.com

The PermitOpen rule in sshd_config holds a list of TCP endpoints and
port number tuples delimited by a space character. The endpoint can be
specified as IP address or FQDN. FQDN are case insensitive, but sshd
performs a case sensitiv check.


The sshd configuration in sshd_config:

PermitOpen=gitlab.company.de:80 lynq.company.de:3121


Here is the ssh client call:

ssh -L 3121:Lynq.company.de:3121 remote.company.de


Solution:
Perform a case insensitive check.

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