Edit File: PROTOCOL
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 SSH filexfer protocol described in: http://www.openssh.com/txt/draft-ietf-secsh-filexfer-02.txt Features from newer versions of the draft are not supported, unless explicitly implemented as extensions described below. The protocol used by OpenSSH's ssh-agent is described in the file PROTOCOL.agent 1. Transport protocol changes 1.1. transport: Protocol 2 MAC algorithm "umac-64@openssh.com" This is a new transport-layer MAC method using the UMAC algorithm (rfc4418). This method is identical to the "umac-64" method documented in: http://www.openssh.com/txt/draft-miller-secsh-umac-01.txt 1.2. transport: Protocol 2 compression algorithm "zlib@openssh.com" 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 avoids exposing compression code to attacks from unauthenticated users. The method is documented in: http://www.openssh.com/txt/draft-miller-secsh-compression-delayed-00.txt 1.3. transport: New public key algorithms "ssh-rsa-cert-v00@openssh.com", "ssh-dsa-cert-v00@openssh.com", "ecdsa-sha2-nistp256-cert-v01@openssh.com", "ecdsa-sha2-nistp384-cert-v01@openssh.com" and "ecdsa-sha2-nistp521-cert-v01@openssh.com" OpenSSH introduces new public key algorithms to support certificate authentication for users and hostkeys. These methods are documented in the file PROTOCOL.certkeys 1.4. transport: Elliptic Curve cryptography OpenSSH supports ECC key exchange and public key authentication as specified in RFC5656. Only the ecdsa-sha2-nistp256, ecdsa-sha2-nistp384 and ecdsa-sha2-nistp521 curves over GF(p) are supported. Elliptic curve points encoded using point compression are NOT accepted or generated. 2. Connection protocol changes 2.1. connection: Channel write close extension "eow@openssh.com" The SSH connection protocol (rfc4254) provides the SSH_MSG_CHANNEL_EOF message to allow an endpoint to signal its peer that it will send no more data over a channel. Unfortunately, there is no symmetric way for an endpoint to request that its peer should cease sending data to it 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 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. OpenSSH implements a channel extension message to perform this signalling: "eow@openssh.com" (End Of Write). This message is sent by an endpoint when the local output of a session channel is closed or experiences a write error. The message is formatted as follows: byte SSH_MSG_CHANNEL_REQUEST uint32 recipient channel string "eow@openssh.com" boolean FALSE On receiving this message, the peer SHOULD cease sending data of the channel and MAY signal the process from which the channel data originates (e.g. by closing its read file descriptor). As with the symmetric SSH_MSG_CHANNEL_EOF message, the channel does remain open after a "eow@openssh.com" has been sent and more data may still be sent in the other direction. This message does not consume window space and may be sent even if no window space is available. NB. due to certain broken SSH implementations aborting upon receipt of this message (in contravention of RFC4254 section 5.4), this message is only sent to OpenSSH peers (identified by banner). Other SSH implementations may be whitelisted to receive this message upon request. 2.2. connection: disallow additional sessions extension "no-more-sessions@openssh.com" Most SSH connections will only ever request a single session, but a attacker may abuse a running ssh client to surreptitiously open additional sessions under their control. OpenSSH provides a global request "no-more-sessions@openssh.com" to mitigate this attack. When an OpenSSH client expects that it will never open another session (i.e. it has been started with connection multiplexing disabled), it will send the following global request: byte SSH_MSG_GLOBAL_REQUEST string "no-more-sessions@openssh.com" char want-reply On receipt of such a message, an OpenSSH server will refuse to open future channels of type "session" and instead immediately abort the connection. Note that this is not a general defence against compromised clients (that is impossible), but it thwarts a simple attack. NB. due to certain broken SSH implementations aborting upon receipt of this message, the no-more-sessions request is only sent to OpenSSH servers (identified by banner). Other SSH implementations may be whitelisted to receive this message upon request. 2.3. connection: Tunnel forward extension "tun@openssh.com" OpenSSH supports layer 2 and layer 3 tunnelling via the "tun@openssh.com" channel type. This channel type supports forwarding of network packets with datagram boundaries intact between endpoints equipped with interfaces like the BSD tun(4) device. Tunnel forwarding channels are requested by the client with the following packet: byte SSH_MSG_CHANNEL_OPEN string "tun@openssh.com" uint32 sender channel uint32 initial window size uint32 maximum packet size uint32 tunnel mode uint32 remote unit number The "tunnel mode" parameter specifies whether the tunnel should forward layer 2 frames or layer 3 packets. It may take one of the following values: SSH_TUNMODE_POINTOPOINT 1 /* layer 3 packets */ SSH_TUNMODE_ETHERNET 2 /* layer 2 frames */ The "tunnel unit number" specifies the remote interface number, or may be zero to allow the server to automatically chose an interface. A server that is not willing to open a client-specified unit should refuse the request with a SSH_MSG_CHANNEL_OPEN_FAILURE error. On successful open, the server should reply with SSH_MSG_CHANNEL_OPEN_SUCCESS. Once established the client and server may exchange packet or frames over the tunnel channel by encapsulating them in SSH protocol strings and sending them as channel data. This ensures that packet boundaries are kept intact. Specifically, packets are transmitted using normal SSH_MSG_CHANNEL_DATA packets: byte SSH_MSG_CHANNEL_DATA uint32 recipient channel string data The contents of the "data" field for layer 3 packets is: uint32 packet length uint32 address family byte[packet length - 4] packet data The "address family" field identifies the type of packet in the message. It may be one of: SSH_TUN_AF_INET 2 /* IPv4 */ SSH_TUN_AF_INET6 24 /* IPv6 */ The "packet data" field consists of the IPv4/IPv6 datagram itself without any link layer header. The contents of the "data" field for layer 3 packets is: uint32 packet length byte[packet length] frame The "frame" field contains an IEEE 802.3 Ethernet frame, including header. 3. SFTP protocol changes 3.1. sftp: Reversal of arguments to SSH_FXP_SYMLINK When OpenSSH's sftp-server was implemented, the order of the arguments to the SSH_FXP_SYMLINK method was inadvertently reversed. Unfortunately, the reversal was not noticed until the server was widely deployed. Since fixing this to follow the specification would cause incompatibility, the current order was retained. For correct operation, clients should send SSH_FXP_SYMLINK as follows: uint32 id string targetpath string linkpath 3.2. sftp: Server extension announcement in SSH_FXP_VERSION OpenSSH's sftp-server lists the extensions it supports using the standard extension announcement mechanism in the SSH_FXP_VERSION server hello packet: uint32 3 /* protocol version */ string ext1-name string ext1-version string ext2-name string ext2-version ... string extN-name string extN-version Each extension reports its integer version number as an ASCII encoded string, e.g. "1". The version will be incremented if the extension is ever changed in an incompatible way. The server MAY advertise the same extension with multiple versions (though this is unlikely). Clients MUST check the version number before attempting to use the extension. 3.3. sftp: Extension request "posix-rename@openssh.com" This operation provides a rename operation with POSIX semantics, which are different to those provided by the standard SSH_FXP_RENAME in draft-ietf-secsh-filexfer-02.txt. This request is implemented as a SSH_FXP_EXTENDED request with the following format: uint32 id string "posix-rename@openssh.com" string oldpath string newpath On receiving this request the server will perform the POSIX operation rename(oldpath, newpath) and will respond with a SSH_FXP_STATUS message. This extension is advertised in the SSH_FXP_VERSION hello with version "1". 3.4. sftp: Extension requests "statvfs@openssh.com" and "fstatvfs@openssh.com" These requests correspond to the statvfs and fstatvfs POSIX system interfaces. The "statvfs@openssh.com" request operates on an explicit pathname, and is formatted as follows: uint32 id string "statvfs@openssh.com" string path The "fstatvfs@openssh.com" operates on an open file handle: uint32 id string "fstatvfs@openssh.com" string handle These requests return a SSH_FXP_STATUS reply on failure. On success they return the following SSH_FXP_EXTENDED_REPLY reply: uint32 id uint64 f_bsize /* file system block size */ uint64 f_frsize /* fundamental fs block size */ uint64 f_blocks /* number of blocks (unit f_frsize) */ uint64 f_bfree /* free blocks in file system */ uint64 f_bavail /* free blocks for non-root */ uint64 f_files /* total file inodes */ uint64 f_ffree /* free file inodes */ uint64 f_favail /* free file inodes for to non-root */ uint64 f_fsid /* file system id */ uint64 f_flag /* bit mask of f_flag values */ uint64 f_namemax /* maximum filename length */ The values of the f_flag bitmask are as follows: #define SSH_FXE_STATVFS_ST_RDONLY 0x1 /* read-only */ #define SSH_FXE_STATVFS_ST_NOSUID 0x2 /* no setuid */ Both the "statvfs@openssh.com" and "fstatvfs@openssh.com" extensions are advertised in the SSH_FXP_VERSION hello with version "2". $OpenBSD: PROTOCOL,v 1.12 2009/02/14 06:35:49 djm Exp $
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