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Re: command-line tool / SFTP / 644 permissions

From: Aaron Couts via curl-users <curl-users_at_cool.haxx.se>
Date: Wed, 23 Sep 2020 16:47:00 -0400

On Tue, Jun 23, 2015 Aaron Couts wrote:

> I recently ran into an issue while attempting to download a file from my
> SFTP server using the curl command-line tool.
>
> $ curl sftp://<user>:<password>@<server>/<file> -o <file>
> curl: (9) Could not open remote file for reading: Permission denied
>
> The remote file has 664 permissions, so there shouldn't be a permissions
> issue. My SFTP server logs show that curl is attempting to change the
> permissions on the file:
>
> Jun 23 15:16:05 mod_sftp/0.9.7[15657]: error changing permissions of
> '/<file>' to 0100644: Operation not permitted
>
> My SFTP user is not the owner of the file, which is why the chmod command
> fails. When I change the permissions from 664 to 644, I can download the
> file with curl, and my SFTP logs don't show any attempt to change the
> permissions.
>
> Is there any way to suppress the chmod command that curl is running? I
> haven't been able to find anything about this in the documentation, the
> curl-users archive, or on google. Hopefully I'm not missing something
> obvious.
>
> My SFTP server is ProFTPD 1.3.3g with mod_sftp. I've tested this issue
> with curl 7.43.0 and 7.19.7.
>

I posted this issue five years ago and have run into it again. Daniel
Stenberg responded to my original post, and I did not follow up -- my
apologies. Due to the delay I'm including my original post and Daniel's
response.

On Mon, Jun 29, 2015 Daniel Stenberg wrote:

> This is really an issue with libssh2 which is doing all the raw SFTP stuff.
> Which version of libssh2 are you using?

Most recently I've replicated this issue, exactly as described above, with
the following versions:

curl 7.19.7
libssh2 1.4.2-2 (from the CentOS 6 yum repository)

curl 7.61.1
libssh2 1.4.2-3.12 (from the AWS yum repository)

curl 7.72.0
libssh2 1.9.0 (on OS X, version # according to formulae.brew.sh -- I
installed it today)

Proftpd is v1.3.3g. I haven't tried this with any custom builds of curl or
libssh2.

Thanks,
Aaron

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Received on 2020-09-23