[Bug 2726] Uploading of large files (1GB+) fails when using SFTP in chrooted configuration

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2726

Darren Tucker <dtucker at zip.com.au> changed:

           What    |Removed                     |Added
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                 CC|                            |dtucker at zip.com.au

--- Comment #2 from Darren Tucker <dtucker at zip.com.au> ---
(In reply to Artur from comment #0)
> SSHD ignores values larger than 1G so the one cannot set
> it over 1GB. 

Note that as per RFC4344 that depends on the cipher.

"""
   Let L be the block length (in bits) of an SSH encryption method's
   block cipher (e.g., 128 for AES).  If L is at least 128, then, after
   rekeying, an SSH implementation SHOULD NOT encrypt more than
2**(L/4)
   blocks before rekeying again.
[...]
   If L is less than 128 (which is the case
   for older ciphers such as 3DES, Blowfish, CAST-128, and IDEA), then,
   [...] rekey at least once for every gigabyte
"""

sshd follows this, so you'll see more frequent rekeying for ciphers
like 3des.  For AES ciphers it should be 4GB, so if you're using 3des
you might be able to work around the problem by changing ciphers.

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