Re: libcurl configuration for sftp

From: Michael Loutris via curl-library <curl-library_at_cool.haxx.se>
Date: Fri, 16 Oct 2020 08:15:16 -0500 (CDT)

> On 10/16/2020 7:20 AM Michael Loutris <mloutris_at_comcast.net> wrote:
>
> > On 10/14/2020 9:46 AM Dan Fandrich via curl-library <curl-library_at_cool.haxx.se> wrote:
> >
> > On Wed, Oct 14, 2020 at 09:06:14AM -0500, Michael Loutris wrote:
> > > > On 10/14/2020 12:35 AM Dan Fandrich via curl-library <curl-library_at_cool.haxx.se> wrote:
> > > >
> > > > On Tue, Oct 13, 2020 at 06:42:50PM -0500, Michael Loutris via curl-library wrote:
> > > > > I am trying to securely transfer a file between two windows 10 devices, and I
> > > > > get error 67, "CURLE_LOGIN_DENIED" when calling curl_easy_perform(). All of
> > > > > the curl_easy_setopt() calls return success.
> > > > >
> > > > > The server has been configured as an SSH server using OpenSSH for Windows 10
> > > > > and using OpenSSH commands from a Windows command prompt are successful in
> > > > > transferring files.
> > > >
> > > > When you use these commands, does the logging show that authentication is
> > > > performed with username+password, or is it being done with a key? Is the key
> > > > encrypted on disk?
> > > >
> > > > Dan
> > > > -------------------------------------------------------------------
> > > Logging shows that authentication is done with a non-encrypted key.
> >
> > Good—that proves the key is working. Next, I'd confirm that there's not a
> > compatibility issue with the ssh backend you're using. Which one is that? For
> > example, recent OpenSSH has disabled many protocols supported by libssh2 and it
> > sometimes has trouble negotiating a compatible one. Can you connect to the
> > server using the appropriate command-line tool associated with the backend in
> > use? For example, can you do an sftp download using the examples/sftp program
> > in libssh2 (using the same library version as your libcurl and changing the
> > keyfile* variables appropriately)?
> > -------------------------------------------------------------------
>
> I built the sftp_write.c example and it is failing at the key authentication step.
> I spent all day yesterday trying to build libssh2.dll from source in order to debug the precise problem, but my inexperience with setting up m4, autoconf, automake, etc. ended up in failure.
>
> UPDATE: As I was replying, I double checked the keys and realized that I was trying to authenticate with the new key that I am trying to send, not the default key.
> That got me much further and now I'm failing at trying to open the file on the server side.
> I know that our admin set up the server to only accept certain permissions, so I'll see if that's an issue.
>
> -Mike

I went back and see that the libcurl code is already setting the correct default key for authentication.
However, I am confused as to how I specify where to write the data on the server.
The information for CURLOPT_URL states that it is for retrieving, so how do I specify the write path?
Thank you,
-Mike

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Received on 2020-10-16