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Highlights from the release notes are reproduced below. Some security and bug fixes were previously merged into FreeBSD and have been elided. See the upstream release notes for full details (https://www.openssh.com/releasenotes.html). --- Future deprecation notice ========================= OpenSSH plans to remove support for the DSA signature algorithm in early 2025. Potentially-incompatible changes -------------------------------- * sshd(8): the server will now block client addresses that repeatedly fail authentication, repeatedly connect without ever completing authentication or that crash the server. See the discussion of PerSourcePenalties below for more information. Operators of servers that accept connections from many users, or servers that accept connections from addresses behind NAT or proxies may need to consider these settings. * sshd(8): the server has been split into a listener binary, sshd(8), and a per-session binary "sshd-session". This allows for a much smaller listener binary, as it no longer needs to support the SSH protocol. As part of this work, support for disabling privilege separation (which previously required code changes to disable) and disabling re-execution of sshd(8) has been removed. Further separation of sshd-session into additional, minimal binaries is planned for the future. * sshd(8): several log messages have changed. In particular, some log messages will be tagged with as originating from a process named "sshd-session" rather than "sshd". * ssh-keyscan(1): this tool previously emitted comment lines containing the hostname and SSH protocol banner to standard error. This release now emits them to standard output, but adds a new "-q" flag to silence them altogether. * sshd(8): (portable OpenSSH only) sshd will no longer use argv[0] as the PAM service name. A new "PAMServiceName" sshd_config(5) directive allows selecting the service name at runtime. This defaults to "sshd". bz2101 New features ------------ * sshd(8): sshd(8) will now penalise client addresses that, for various reasons, do not successfully complete authentication. This feature is controlled by a new sshd_config(5) PerSourcePenalties option and is on by default. * ssh(8): allow the HostkeyAlgorithms directive to disable the implicit fallback from certificate host key to plain host keys. Portability ----------- * sshd(8): expose SSH_AUTH_INFO_0 always to PAM auth modules unconditionally. The previous behaviour was to expose it only when particular authentication methods were in use. * ssh(1), ssh-agent(8): allow the presence of the WAYLAND_DISPLAY environment variable to enable SSH_ASKPASS, similarly to the X11 DISPLAY environment variable. GHPR479 --- Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D48914 (cherry picked from commit 0fdf8fae8b569bf9fff3b5171e669dcd7cf9c79e) (cherry picked from commit b4bb480ae9294d7e4b375f0ead9ae57517c79ef3) (cherry picked from commit e95979047aec384852102cf8bb1d55278ea77eeb) (cherry picked from commit dcb4ae528d357f34e4a4b4882c2757c67c98e395) Approved by: re (accelerated MFC)
71 lines
1.6 KiB
Text
71 lines
1.6 KiB
Text
This document describes the private key format for OpenSSH.
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1. Overall format
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The key consists of a header, a list of public keys, and
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an encrypted list of matching private keys.
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#define AUTH_MAGIC "openssh-key-v1"
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byte[] AUTH_MAGIC
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string ciphername
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string kdfname
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string kdfoptions
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uint32 number of keys N
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string publickey1
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string publickey2
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...
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string publickeyN
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string encrypted, padded list of private keys
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2. KDF options for kdfname "bcrypt"
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The options:
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string salt
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uint32 rounds
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are concatenated and represented as a string.
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3. Unencrypted list of N private keys
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The list of privatekey/comment pairs is padded with the
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bytes 1, 2, 3, ... until the total length is a multiple
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of the cipher block size.
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uint32 checkint
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uint32 checkint
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byte[] privatekey1
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string comment1
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byte[] privatekey2
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string comment2
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...
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byte[] privatekeyN
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string commentN
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byte 1
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byte 2
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byte 3
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...
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byte padlen % 255
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where each private key is encoded using the same rules as used for
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SSH agent.
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Before the key is encrypted, a random integer is assigned
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to both checkint fields so successful decryption can be
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quickly checked by verifying that both checkint fields
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hold the same value.
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4. Encryption
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The KDF is used to derive a key, IV (and other values required by
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the cipher) from the passphrase. These values are then used to
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encrypt the unencrypted list of private keys.
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5. No encryption
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For unencrypted keys the cipher "none" and the KDF "none"
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are used with empty passphrases. The options if the KDF "none"
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are the empty string.
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$OpenBSD: PROTOCOL.key,v 1.4 2024/03/30 05:56:22 djm Exp $
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