thr3ads.net - openssh bugs - [Bug 3529] New: `add_host_to_hostfile` should take into consideration that the known_hosts file isn't terminated with a newline character. [Jan 2023]

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bugzilla-daemon at mindrot.org

2023-Jan-30 19:05 UTC

[Bug 3529] New: `add_host_to_hostfile` should take into consideration that the known_hosts file isn't terminated with a newline character.

https://bugzilla.mindrot.org/show_bug.cgi?id=3529

            Bug ID: 3529
           Summary: `add_host_to_hostfile` should take into consideration
                    that the known_hosts file isn't terminated with a
                    newline character.
           Product: Portable OpenSSH
           Version: 9.1p1
          Hardware: ix86
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: git+openssh at limpsquid.nl

If the known_hosts file isn't terminated with a newline character the
`add_host_to_hostfile` appends the new host key to the last line which
might already contain a valid host key.

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bugzilla-daemon at mindrot.org

2023-Jan-31 23:04 UTC

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[Bug 3529] `add_host_to_hostfile` should take into consideration that the known_hosts file isn't terminated with a newline character.

https://bugzilla.mindrot.org/show_bug.cgi?id=3529

Mike <git+openssh at limpsquid.nl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |git+openssh at limpsquid.nl

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bugzilla-daemon at mindrot.org

2023-Feb-04 06:59 UTC

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[Bug 3529] `add_host_to_hostfile` should take into consideration that the known_hosts file isn't terminated with a newline character.

https://bugzilla.mindrot.org/show_bug.cgi?id=3529

Darren Tucker <dtucker at dtucker.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |3533
                 CC|                            |dtucker at dtucker.net


Referenced Bugs:

https://bugzilla.mindrot.org/show_bug.cgi?id=3533
[Bug 3533] tracking bug for openssh-9.3
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bugzilla-daemon at mindrot.org

2023-Feb-04 07:10 UTC

head link

[Bug 3529] `add_host_to_hostfile` should take into consideration that the known_hosts file isn't terminated with a newline character.

https://bugzilla.mindrot.org/show_bug.cgi?id=3529

Darren Tucker <dtucker at dtucker.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |djm at mindrot.org
   Attachment #3655|                            |ok?(djm at mindrot.org)
              Flags|                            |

--- Comment #1 from Darren Tucker <dtucker at dtucker.net> ---
Created attachment 3655
  --> https://bugzilla.mindrot.org/attachment.cgi?id=3655&action=edit
Check for newline at end of known_hosts and add it missing

Please try this patch.

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bugzilla-daemon at mindrot.org

2023-Feb-05 09:33 UTC

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[Bug 3529] `add_host_to_hostfile` should take into consideration that the known_hosts file isn't terminated with a newline character.

https://bugzilla.mindrot.org/show_bug.cgi?id=3529

Darren Tucker <dtucker at dtucker.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Attachment #3655|0                           |1
        is obsolete|                            |
   Attachment #3655|ok?(djm at mindrot.org)        |
              Flags|                            |

--- Comment #2 from Darren Tucker <dtucker at dtucker.net> ---
Created attachment 3656
  --> https://bugzilla.mindrot.org/attachment.cgi?id=3656&action=edit
Check for newline at end of known_hosts and add it missing.  Close FILE
* if write fails.

Please try this one instead.

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bugzilla-daemon at mindrot.org

2023-Feb-05 09:38 UTC

head link

[Bug 3529] `add_host_to_hostfile` should take into consideration that the known_hosts file isn't terminated with a newline character.

https://bugzilla.mindrot.org/show_bug.cgi?id=3529

Darren Tucker <dtucker at dtucker.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Attachment #3656|                            |ok?(djm at mindrot.org)
              Flags|                            |

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bugzilla-daemon at mindrot.org

2023-Feb-05 10:40 UTC

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[Bug 3529] `add_host_to_hostfile` should take into consideration that the known_hosts file isn't terminated with a newline character.

https://bugzilla.mindrot.org/show_bug.cgi?id=3529

--- Comment #3 from Mike <git+openssh at limpsquid.nl> ---
(In reply to Darren Tucker from comment #2)> Created attachment 3656 [details]
> Check for newline at end of known_hosts and add it missing.  Close
> FILE * if write fails.
> 
> Please try this one instead.
Patch looks good to me, I'll try it out and report back in a day or so.

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bugzilla-daemon at mindrot.org

2023-Feb-06 10:43 UTC

head link

[Bug 3529] `add_host_to_hostfile` should take into consideration that the known_hosts file isn't terminated with a newline character.

https://bugzilla.mindrot.org/show_bug.cgi?id=3529

Mike <git+openssh at limpsquid.nl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Attachment #3657|                            |ok?
              Flags|                            |

--- Comment #4 from Mike <git+openssh at limpsquid.nl> ---
Created attachment 3657
  --> https://bugzilla.mindrot.org/attachment.cgi?id=3657&action=edit
Open for reading and appending.

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bugzilla-daemon at mindrot.org

2023-Feb-06 10:44 UTC

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[Bug 3529] `add_host_to_hostfile` should take into consideration that the known_hosts file isn't terminated with a newline character.

https://bugzilla.mindrot.org/show_bug.cgi?id=3529

--- Comment #5 from Mike <git+openssh at limpsquid.nl> ---
(In reply to Darren Tucker from comment #2)> Created attachment 3656 [details]
> Check for newline at end of known_hosts and add it missing.  Close
> FILE * if write fails.
> 
> Please try this one instead.
I've tested it and for a file which already was terminated with a
new-line it still added an extra new-line.

I've changed the open mode to `a+` since that should be used for both
appending and reading the file.

I also had to change the initial fseek to `fseek(f, -1, SEEK_END)`. The
docs (https://www.man7.org/linux/man-pages/man3/fopen.3.html) mention
the following:
> Open for reading and appending (writing at end of file).
> The file is created if it does not exist.  Output is
> always appended to the end of the file.  POSIX is silent
> on what the initial read position is when using this mode.
> For glibc, the initial file position for reading is at the
> beginning of the file, but for Android/BSD/MacOS, the
> initial file position for reading is at the end of the
> file.
The attachement was added in my previous comment.

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bugzilla-daemon at mindrot.org

2023-Feb-06 10:47 UTC

head link

[Bug 3529] `add_host_to_hostfile` should take into consideration that the known_hosts file isn't terminated with a newline character.

https://bugzilla.mindrot.org/show_bug.cgi?id=3529

Mike <git+openssh at limpsquid.nl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Attachment #3657|ok?                         |ok?(dtucker at dtucker.net)
              Flags|                            |

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bugzilla-daemon at mindrot.org

2023-Feb-09 10:09 UTC

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[Bug 3529] `add_host_to_hostfile` should take into consideration that the known_hosts file isn't terminated with a newline character.

https://bugzilla.mindrot.org/show_bug.cgi?id=3529

Darren Tucker <dtucker at dtucker.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #6 from Darren Tucker <dtucker at dtucker.net> ---
Applied your version, thanks.

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bugzilla-daemon at mindrot.org

2023-Feb-10 05:11 UTC

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[Bug 3529] `add_host_to_hostfile` should take into consideration that the known_hosts file isn't terminated with a newline character.

https://bugzilla.mindrot.org/show_bug.cgi?id=3529

Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Attachment #3656|ok?(djm at mindrot.org)        |ok+
              Flags|                            |

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bugzilla-daemon at mindrot.org

2023-Mar-17 02:43 UTC

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[Bug 3529] `add_host_to_hostfile` should take into consideration that the known_hosts file isn't terminated with a newline character.

https://bugzilla.mindrot.org/show_bug.cgi?id=3529

Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #7 from Damien Miller <djm at mindrot.org> ---
OpenSSH 9.3 has been released. Close resolved bugs

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