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version 1.1, 2008/05/16 08:30:42

version 1.2, 2008/05/17 01:31:56

Line 1

This documents OpenSSH's deviations and extensions to the published SSH

protocol.

Note that OpenSSH's sftp and sftp-server implement revision 3 of the the

Note that OpenSSH's sftp and sftp-server implement revision 3 of the SSH

SSH filexfer protocol described in:

filexfer protocol described in:

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This transport-layer compression method uses the zlib compression

algorithm (identical to the "zlib" method in rfc4253), but delays the

start of compression until after authentication has completed. This

avoid exposing compression code to attacks from unauthenticated users.

avoids exposing compression code to attacks from unauthenticated users.

The method is documented in:

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while still keeping the channel open for the endpoint to send data to

the peer.

This is desirable, since it saves the transmission of data the would

This is desirable, since it saves the transmission of data that would

otherwise need to be discarded and it allows an endpoint to signal local

processes of the condition, e.g. by closing the corresponding file

descriptor.

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"1".

7. sftp: Extension requests "statvfs@openssh.com" and

These requests correspond to the statvfs and fstatvfs POSIX system

interfaces. The "statvfs@openssh.com" request operates on an explicit

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The "fstatvfs@openssh.com" operates on an open filehandle:

uint32 id

string "statvfs@openssh.com"

string "fstatvfs@openssh.com"

string handle

These requests return a SSH_FXP_STATUS reply on failure. On success they