[Bug 1574415] [NEW] [16.04] ssh <host>: Bad protocol spec '1'

[TJ]

Public bug reported:

After upgrade to 16.04 ssh client will not connect to any host,
reporting

/home/tj/.ssh/config line 109: Bad protocol spec '1'.

The entry is:

Host ups-01
Hostname 10.254.0.1
User hostmaster
IdentityFile ~/.ssh/id_hostmaster
IdentitiesOnly yes
Protocol 1

If this were an entry in /etc/ssh/ssh_config and the user had no
privileges to edit that file it could create a denial of service to the
ssh client (if the user doesn't know how to over-ride the config).

It would be helpful if the openssh-client postinst script were to grep
the standard config files (including for users) and add a warning to the
motd and syslog if any invalidated configuration statements are found.

This will especially affect connections to embedded devices - in this
case it is an ssh server on a management VLAN in one of several network-
attached Uninterruptable Power Supplies that cannot be upgraded, and
only support Protocol 1.

According to the 16.04 Release Notes protocol 1 requires the openssh-
client-ssh1 package with the ssh1 binary.

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

** Description changed:

  After upgrade to 16.04 ssh client will not connect to any host,
  reporting
  
  /home/tj/.ssh/config line 109: Bad protocol spec '1'.
  
  The entry is:
  
  Host ups-01
  Hostname 10.254.0.1
  User hostmaster
  IdentityFile ~/.ssh/id_hostmaster
  IdentitiesOnly yes
  Protocol 1
  
- 
- If this were an entry in /etc/ssh/ssh_config and the user had no privileges to edit that file it could create a denial of service to the ssh client (if the user doesn't know how to over-ride the config).
+ If this were an entry in /etc/ssh/ssh_config and the user had no
+ privileges to edit that file it could create a denial of service to the
+ ssh client (if the user doesn't know how to over-ride the config).
  
  It would be helpful if the openssh-client postinst script were to grep
  the standard config files (including for users) and add a warning to the
  motd and syslog if any invalidated configuration statements are found.
  
  This will especially affect connections to embedded devices - in this
- case it is an ssh server on a management VLAN in a network-attached
- 32-port switched Cabinet Distribution Unit (CDU) that cannot be
- upgraded, and only supports Protocol 1.
+ case it is an ssh server on a management VLAN in one of several network-
+ attached Uninterruptable Power Supplies that cannot be upgraded, and
+ only support Protocol 1.
  
  According to the 16.04 Release Notes protocol 1 requires the openssh-
  client-ssh1 package with the ssh1 binary.

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https://bugs.launchpad.net/bugs/1574415

Title:
  [16.04] ssh <host>: Bad protocol spec '1'

Status in openssh package in Ubuntu:
  New

Bug description:
  After upgrade to 16.04 ssh client will not connect to any host,
  reporting

  /home/tj/.ssh/config line 109: Bad protocol spec '1'.

  The entry is:

  Host ups-01
  Hostname 10.254.0.1
  User hostmaster
  IdentityFile ~/.ssh/id_hostmaster
  IdentitiesOnly yes
  Protocol 1

  If this were an entry in /etc/ssh/ssh_config and the user had no
  privileges to edit that file it could create a denial of service to
  the ssh client (if the user doesn't know how to over-ride the config).

  It would be helpful if the openssh-client postinst script were to grep
  the standard config files (including for users) and add a warning to
  the motd and syslog if any invalidated configuration statements are
  found.

  This will especially affect connections to embedded devices - in this
  case it is an ssh server on a management VLAN in one of several
  network-attached Uninterruptable Power Supplies that cannot be
  upgraded, and only support Protocol 1.

  According to the 16.04 Release Notes protocol 1 requires the openssh-
  client-ssh1 package with the ssh1 binary.

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