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#1070 problem using --hostpubmd5 with sftp

closed-fixed
SCP/SFTP (19)
5
2013-06-21
2011-12-05
Reza Arbab
No

### When a host is not in ~/.ssh/known_hosts, curl sftp fails as expected:
> curl sftp://root:password@linux-2mur/etc/resolv.conf
curl: (51) SSL peer certificate or SSH remote key was not OK

### Using an incorrect md5 value with --hostpubmd5 also fails as expected:
> curl --hostpubmd5 87a487deb4ce3420e3eb49f5263adbfa sftp://root:password@linux-2mur/etc/resolv.conf
curl: (51) Denied establishing ssh session: mismatch md5 fingerprint. Remote 87a487deb4ce3420e3eb49f5263adbf3 is not equal to 87a487deb4ce3420e3eb49f5263adbfa

### However, using the correct md5 value also fails. This is the bug:
> curl --hostpubmd5 87a487deb4ce3420e3eb49f5263adbf3 sftp://root:password@linux-2mur/etc/resolv.conf
curl: (51) SSL peer certificate or SSH remote key was not OK

### After adding the host to ~/.ssh/known_hosts, curl sftp works with or without --hostpubmd5:

> sftp linux-2mur
Connecting to linux-2mur...
The authenticity of host 'linux-2mur (9.53.40.189)' can't be established.
RSA key fingerprint is 87:a4:87:de:b4:ce:34:20:e3:eb:49:f5:26:3a:db:f3.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'linux-2mur,9.53.40.189' (RSA) to the list of known hosts.
Password:
sftp> quit
> curl -o resolv.conf --hostpubmd5 87a487deb4ce3420e3eb49f5263adbf3 sftp://root:password@linux-2mur/etc/resolv.conf
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 861 100 861 0 0 1371 0 --:--:-- --:--:-- --:--:-- 1371
> curl -o resolv.conf sftp://root:password@linux-2mur/etc/resolv.conf
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 861 100 861 0 0 1496 0 --:--:-- --:--:-- --:--:-- 1496
>

Discussion

  • Reza Arbab
    Reza Arbab
    2011-12-05

    Sorry, forgot my version info:

    > curl -V
    curl 7.23.1 (sh4-unknown-linux-gnu) libcurl/7.23.1 OpenSSL/0.9.8j zlib/1.2.3 libssh2/1.3.0
    Protocols: dict file ftp ftps gopher http https imap imaps pop3 pop3s rtsp scp sftp smtp smtps telnet tftp
    Features: IPv6 Largefile NTLM NTLM_WB SSL libz

     
    • status: open --> closed-fixed