[Bug 1023360] [NEW] Comments longer than 1024 chars break sshd_config

[Nils Toedtmann]

Public bug reported:

When sshd_config contains a comment of more than 1023 chars, it treats
char 1024+ as valid configuration. That usually breaks the config, or
(in case there accidentally is valid sshd_config syntax) is unwanted.

To verify the bug, apply appended patch to sshd_config (that prepends a
long comment) and try to start ssh. You will see this:

  $ sudo /usr/sbin/sshd 
  /etc/ssh/sshd_config: line 2: Bad configuration option: ThisIsAnInvalidOption
  /etc/ssh/sshd_config: terminating, 1 bad configuration options

Note that it complains about line 2 though the offending comment is in
line 1.

It is worth mentioning that active configuration lines longer than 1023
chars work fine. (I discovered this bug when i commented out a long
"Match Address" list)


This bug strikes at on 
 * openssh-server 1:5.3p1-3ubuntu7 (Ubuntu 10.04 LTS)
 * openssh-server 1:5.8p1-7ubuntu1 (Ubuntu 11.10)
 * openssh-server 1:5.9p1-5ubuntu1 (Ubuntu 12.04 LTS)

** Affects: openssh (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1023360

Title:
  Comments longer than 1024 chars break sshd_config

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