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specs.yml
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iana:
name: IANA
url: https://www.ietf.org/assignments/ssh-parameters/ssh-parameters.xml
title: "IANA SSH algorithm registry"
rfc4250:
name: RFC 4250
url: https://tools.ietf.org/html/rfc4250
title: "SSH Protocol Assigned Numbers"
rfc4251:
name: RFC 4251
url: https://tools.ietf.org/html/rfc4251
title: "SSH Protocol Architecture"
rfc4252:
name: RFC 4252
url: https://tools.ietf.org/html/rfc4252
errata: https://www.rfc-editor.org/errata_search.php?rfc=4252
title: "SSH Authentication Protocol"
protocols:
userauth:
- publickey # REQUIRED
- password
- hostbased
#- none # suppressed (see issue #27)
rfc4253:
name: RFC 4253
url: https://tools.ietf.org/html/rfc4253
errata: https://www.rfc-editor.org/errata_search.php?rfc=4253
title: "SSH Transport Layer Protocol"
protocols:
cipher:
- 3des-cbc # REQUIRED
- blowfish-cbc
- twofish256-cbc
- twofish-cbc
- twofish192-cbc
- twofish128-cbc
- aes256-cbc
- aes192-cbc
- aes128-cbc # RECOMMENDED
- serpent256-cbc
- serpent192-cbc
- serpent128-cbc
- arcfour
- idea-cbc
- cast128-cbc
#- none # suppressed (see issue #27)
#- des-cbc # HISTORIC
compression:
- zlib # OPTIONAL
- none # REQUIRED
hostkey:
- ssh-dss # REQUIRED
- ssh-rsa # RECOMMENDED
- pgp-sign-rsa
- pgp-sign-dss
kex:
- diffie-hellman-group1-sha1 # REQUIRED / draft-ietf-curdle-ssh-kex-sha2: SHOULD NOT
- diffie-hellman-group14-sha1 # REQUIRED / draft-ietf-curdle-ssh-kex-sha2: SHOULD
mac:
- hmac-sha1 # REQUIRED
- hmac-sha1-96 # RECOMMENDED
- hmac-md5
- hmac-md5-96
#- none # NOT RECOMMENDED / suppressed (see issue #27)
rfc4254:
name: RFC 4254
url: https://tools.ietf.org/html/rfc4254
errata: https://www.rfc-editor.org/errata_search.php?rfc=4254
title: "SSH Connection Protocol"
rfc4255:
name: RFC 4255
url: https://tools.ietf.org/html/rfc4255
errata: https://www.rfc-editor.org/errata_search.php?rfc=4255
title: "Using DNS to Securely Publish SSH Key Fingerprints"
rfc4256:
name: RFC 4256
url: https://tools.ietf.org/html/rfc4256
errata: https://www.rfc-editor.org/errata_search.php?rfc=4256
title: "Generic Message Exchange Authentication for the SSH Protocol"
protocols:
userauth:
- keyboard-interactive
rfc4335:
name: RFC 4335
url: https://tools.ietf.org/html/rfc4335
errata: https://www.rfc-editor.org/errata_search.php?rfc=4335
title: "SSH Session Channel Break Extension"
rfc4344:
name: RFC 4344
url: https://tools.ietf.org/html/rfc4344
title: "SSH Transport Layer Encryption Modes"
protocols:
cipher:
- aes128-ctr # RECOMMENDED
- aes192-ctr # RECOMMENDED
- aes256-ctr # RECOMMENDED
- 3des-ctr # RECOMMENDED
- blowfish-ctr
- twofish128-ctr
- twofish192-ctr
- twofish256-ctr
- serpent128-ctr
- serpent192-ctr
- serpent256-ctr
- idea-ctr
- cast128-ctr
rfc4345:
name: RFC 4345
url: https://tools.ietf.org/html/rfc4345
errata: https://www.rfc-editor.org/errata_search.php?rfc=4345
title: "Improved Arcfour Modes for the SSH Transport Layer Protocol"
protocols:
cipher:
- arcfour128
- arcfour256
rfc4419:
name: RFC 4419
url: https://tools.ietf.org/html/rfc4419
errata: https://www.rfc-editor.org/errata_search.php?rfc=4419
title: "Diffie-Hellman Group Exchange for the SSH Transport Layer Protocol"
protocols:
kex:
- diffie-hellman-group-exchange-sha1 # draft-ietf-curdle-ssh-kex-sha2: SHOULD NOT
- diffie-hellman-group-exchange-sha256 # draft-ietf-curdle-ssh-kex-sha2: MAY
rfc4432:
name: RFC 4432
url: https://tools.ietf.org/html/rfc4432
title: "RSA Key Exchange for the SSH Transport Layer Protocol"
protocols:
kex:
- rsa1024-sha1 # draft-ietf-curdle-ssh-kex-sha2: MUST NOT
- rsa2048-sha256 # draft-ietf-curdle-ssh-kex-sha2: MAY
rfc4462:
name: RFC 4462
url: https://tools.ietf.org/html/rfc4462
errata: https://www.rfc-editor.org/errata_search.php?rfc=4462
title: "GSS-API Authentication and Key Exchange for the SSH Protocol"
protocols:
kex:
- gss-gex-sha1-* # draft-ietf-curdle-ssh-kex-sha2: SHOULD NOT
- gss-group1-sha1-* # draft-ietf-curdle-ssh-kex-sha2: SHOULD NOT
- gss-group14-sha1-* # draft-ietf-curdle-ssh-kex-sha2: SHOULD
#- gss-* # reserved
hostkey:
- "null"
userauth:
- gssapi-with-mic
- gssapi-keyex
#- gssapi # unused, from earlier version of the spec
#- external-keyx # unused, from earlier version of the spec
rfc4716:
name: RFC 4716
url: https://tools.ietf.org/html/rfc4716
title: "SSH Public Key File Format"
rfc4819:
name: RFC 4819
url: https://tools.ietf.org/html/rfc4819
title: "SSH Public Key Subsystem"
rfc5114:
name: RFC 5114
url: https://tools.ietf.org/html/rfc5114
title: "Additional Diffie-Hellman Groups for Use with IETF Standards [ section 3.4 references SSH ]"
rfc5647:
name: RFC 5647
url: https://tools.ietf.org/html/rfc5647
title: "AES Galois Counter Mode for the SSH Transport Layer Protocol"
protocols:
cipher:
- AEAD_AES_128_GCM
- AEAD_AES_256_GCM
mac:
- AEAD_AES_128_GCM
- AEAD_AES_256_GCM
# Not really usable, see also
# http://article.gmane.org/gmane.ietf.secsh/7110
rfc5656:
name: RFC 5656
url: https://tools.ietf.org/html/rfc5656
errata: https://www.rfc-editor.org/errata_search.php?rfc=5656
title: "Elliptic Curve Algorithm Integration in the SSH Transport Layer"
protocols:
hostkey:
- ecdsa-sha2-nistp256 # REQUIRED
- ecdsa-sha2-nistp384 # REQUIRED
- ecdsa-sha2-nistp521 # REQUIRED
kex:
- ecdh-sha2-nistp256 # REQUIRED / draft-ietf-curdle-ssh-kex-sha2: SHOULD
- ecdh-sha2-nistp384 # REQUIRED / draft-ietf-curdle-ssh-kex-sha2: SHOULD
- ecdh-sha2-nistp521 # REQUIRED / draft-ietf-curdle-ssh-kex-sha2: MAY [not recommended]
- ecmqv-sha2 # OPTIONAL
rfc6187:
name: RFC 6187
url: https://tools.ietf.org/html/rfc6187
title: "X.509v3 Certificates for SSH Authentication"
protocols:
hostkey:
- x509v3-ssh-dss
- x509v3-ssh-rsa
- x509v3-rsa2048-sha256
#- x509v3-ecdsa-sha2-*
- x509v3-ecdsa-sha2-nistp256
- x509v3-ecdsa-sha2-nistp384
- x509v3-ecdsa-sha2-nistp521
rfc6239:
name: RFC 6239
url: https://tools.ietf.org/html/rfc6594
errata: https://www.rfc-editor.org/errata_search.php?rfc=6239
title: "Suite B Cryptographic Suites for SSH"
rfc6594:
name: RFC 6594
url: https://tools.ietf.org/html/rfc6594
errata: https://www.rfc-editor.org/errata_search.php?rfc=6594
title: "Use of the SHA-256 Algorithm with RSA, DSA, and ECDSA in SSHFP Resource Records"
rfc6668:
name: RFC 6668
url: https://tools.ietf.org/html/rfc6668
title: "SHA-2 Data Integrity Verification for the SSH Transport Layer Protocol"
protocols:
mac:
- hmac-sha2-256 # RECOMMENDED
- hmac-sha2-512 # OPTIONAL
rfc7479:
name: RFC 7479
url: https://tools.ietf.org/html/rfc7479
errata: https://www.rfc-editor.org/errata_search.php?rfc=7479
title: "Using Ed25519 in SSHFP Resource Records"
rfc7748:
name: RFC 7748
url: https://tools.ietf.org/html/rfc7748
errata: https://www.rfc-editor.org/errata_search.php?rfc=7748
title: "Elliptic Curves for Security"
rfc8160:
name: RFC 8160
url: https://tools.ietf.org/html/rfc8160
title: "IUTF8 Terminal Mode in Secure Shell (SSH)"
rfc8268:
name: RFC 8268
url: https://tools.ietf.org/html/rfc8268
title: "More Modular Exponential (MODP) Diffie-Hellman (DH) Key Exchange (KEX) Groups for Secure Shell (SSH)"
protocols:
kex:
- diffie-hellman-group14-sha256 # draft-ietf-curdle-ssh-kex-sha2: MUST
- diffie-hellman-group15-sha512 # draft-ietf-curdle-ssh-kex-sha2: MAY
- diffie-hellman-group16-sha512 # draft-ietf-curdle-ssh-kex-sha2: SHOULD
- diffie-hellman-group17-sha512 # draft-ietf-curdle-ssh-kex-sha2: MAY
- diffie-hellman-group18-sha512 # draft-ietf-curdle-ssh-kex-sha2: MAY
rfc8270:
name: RFC 8270
url: https://tools.ietf.org/html/rfc8270
errata: https://www.rfc-editor.org/errata_search.php?rfc=8270
title: "Increase the Secure Shell Minimum Recommended Diffie-Hellman Modulus Size to 2048 Bits"
rfc8308:
name: RFC 8308
url: https://tools.ietf.org/html/rfc8308
title: "Extension Negotiation in the Secure Shell (SSH) Protocol"
protocols:
extension:
- server-sig-algs
- delay-compression
- no-flow-control
- elevation
kex:
- ext-info-s
- ext-info-c
rfc8332:
name: RFC 8332
url: https://tools.ietf.org/html/rfc8332
title: "Use of RSA Keys with SHA-256 and SHA-512 in the Secure Shell (SSH) Protocol"
protocols:
hostkey:
- rsa-sha2-256 # RECOMMENDED
- rsa-sha2-512 # OPTIONAL
rfc8709:
name: RFC 8709
url: https://tools.ietf.org/html/rfc8709
errata: https://www.rfc-editor.org/errata_search.php?rfc=8709
title: "Ed25519 and Ed448 Public Key Algorithms for the Secure Shell (SSH) Protocol"
protocols:
hostkey:
- ssh-ed25519
- ssh-ed448
rfc8731:
name: RFC 8731
url: https://tools.ietf.org/html/rfc8731
title: "Secure Shell (SSH) Key Exchange Method using Curve25519 and Curve448"
protocols:
kex:
- curve25519-sha256 # draft-ietf-curdle-ssh-kex-sha2: SHOULD
- curve448-sha512 # draft-ietf-curdle-ssh-kex-sha2: MAY
rfc8732:
name: RFC 8732
url: https://tools.ietf.org/html/rfc8732
title: "Generic Security Service Application Program Interface (GSS-API) Key Exchange with SHA-2"
protocols:
kex:
- gss-group14-sha256-* # draft-ietf-curdle-ssh-kex-sha2: SHOULD
- gss-group15-sha512-* # draft-ietf-curdle-ssh-kex-sha2: MAY
- gss-group16-sha512-* # draft-ietf-curdle-ssh-kex-sha2: SHOULD
- gss-group17-sha512-* # draft-ietf-curdle-ssh-kex-sha2: MAY
- gss-group18-sha512-* # draft-ietf-curdle-ssh-kex-sha2: MAY
- gss-nistp256-sha256-*
- gss-nistp384-sha384-*
- gss-nistp521-sha512-*
- gss-curve25519-sha256-*
- gss-curve448-sha512-*
rfc8758:
name: RFC 8758
url: https://tools.ietf.org/html/rfc8758
title: "Deprecating RC4 in Secure Shell (SSH)"
rfc9142:
name: RFC 9142
url: https://tools.ietf.org/html/rfc9142
errata: https://www.rfc-editor.org/errata_search.php?rfc=9142
title: "Key Exchange (KEX) Method Updates and Recommendations for Secure Shell (SSH)"
rfc9212:
name: RFC 9212
url: https://tools.ietf.org/html/rfc9212
title: "Commercial National Security Algorithm (CNSA) Suite Cryptography for Secure Shell (SSH)"
rfc9519:
name: RFC 9519
url: https://tools.ietf.org/html/rfc9519
title: "Update to the IANA SSH Protocol Parameters Registry Requirements"
draft-ietf-secsh-x509-03:
name: draft-ietf-secsh-x509-03
url: https://tools.ietf.org/html/draft-ietf-secsh-x509-03
title: "X.509v3 Certificates for SSH Authentication [ expired 2006-09-01 ]"
# Quote:
# This document adds "x509v3-sign-rsa" and "x509v3-sign-dss" to the SSH
# publickey type registry as "poisoned" by historical use.
protocols:
hostkey:
- x509v3-sign
- x509v3-sign-rsa-sha1
- x509v3-sign-dss-sha1
draft-ietf-secsh-filexfer-02:
name: draft-ietf-secsh-filexfer-02
url: https://tools.ietf.org/html/draft-ietf-secsh-filexfer-02
title: "SSH File Transfer Protocol [ expired 2002-04-01 ]"
draft-josefsson-ntruprime-ssh-03:
name: draft-josefsson-ntruprime-ssh-03
url: https://tools.ietf.org/html/draft-josefsson-ntruprime-ssh-03.html
title: "Secure Shell (SSH) Key Exchange Method Using Hybrid Streamlined NTRU Prime sntrup761 and X25519 with SHA-512: sntrup761x25519-sha512 [ expired 2025-02-18 ]"
protocols:
kex:
- sntrup761x25519-sha512
draft-kampanakis-curdle-ssh-pq-ke-01:
name: draft-kampanakis-curdle-ssh-pq-ke-01
url: https://tools.ietf.org/html/draft-kampanakis-curdle-ssh-pq-ke-01.html
title: "Post-quantum Hybrid Key Exchange in SSH [ expired 2023-10-12 ]"
protocols:
kex:
- ecdh-nistp256-kyber-512r3-sha256-d00@openquantumsafe.org
- ecdh-nistp384-kyber-768r3-sha384-d00@openquantumsafe.org
- ecdh-nistp521-kyber-1024r3-sha512-d00@openquantumsafe.org
- x25519-kyber-512r3-sha256-d00@amazon.com
draft-kampanakis-curdle-ssh-pq-ke-04:
name: draft-kampanakis-curdle-ssh-pq-ke-04
url: https://tools.ietf.org/html/draft-kampanakis-curdle-ssh-pq-ke-04.html
title: "PQ/T Hybrid Key Exchange in SSH [ expired 2025-02-25 ]"
protocols:
kex:
- mlkem768nistp256-sha256
- mlkem1024nistp384-sha384
- mlkem768x25519-sha256
draft-kanno-secsh-camellia-02:
name: draft-kanno-secsh-camellia-02
url: https://tools.ietf.org/html/draft-kanno-secsh-camellia-02
title: "Camellia cipher for the Secure Shell Transport Layer Protocol [ expired 2011-08-01 ]"
protocols:
cipher:
- camellia128-cbc
- camellia192-cbc
- camellia256-cbc
- camellia128-ctr
- camellia192-ctr
- camellia256-ctr
- AEAD_CAMELLIA_128_GCM
- AEAD_CAMELLIA_256_GCM
mac:
- AEAD_CAMELLIA_128_GCM
- AEAD_CAMELLIA_256_GCM
draft-ssh-ext-auth-info-01:
name: draft-ssh-ext-auth-info-01
url: https://tools.ietf.org/html/draft-ssh-ext-auth-info-01
title: "Extended authentication information in Secure Shell (SSH) [ expired 2018-09-18 ]"
protocols:
extension:
- ext-auth-info
draft-ssh-global-requests-ok-00:
name: draft-ssh-global-requests-ok-00
url: https://tools.ietf.org/html/draft-ssh-global-requests-ok-00
title: "Sending and Handling of Global Requests in Secure Shell (SSH) [ expired 2019-05-18 ]"
protocols:
extension:
- global-requests-ok
libssh:
name: libssh
url: https://git.libssh.org/projects/libssh.git/tree/doc/curve25519-sha256@libssh.org.txt
title: "The key exchange methode curve25519-sha256@libssh.org"
protocols:
kex:
- curve25519-sha256@libssh.org
openssh:
name: OpenSSH
url: https://www.openssh.com/specs.html
title: "Specifications implemented by OpenSSH, including information about some of their SSH extensions"
# https://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/usr.bin/ssh/PROTOCOL?rev=HEAD&content-type=text/plain
# https://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/usr.bin/ssh/PROTOCOL.certkeys?rev=HEAD&content-type=text/plain
# https://www.openssh.com/txt/draft-miller-secsh-umac-01.txt
# https://www.openssh.com/txt/draft-miller-secsh-compression-delayed-00.txt
#
protocols:
cipher:
- aes128-gcm@openssh.com # see also https://www.openssh.com/txt/release-6.2
- aes256-gcm@openssh.com # see also https://www.openssh.com/txt/release-6.2
compression:
- zlib@openssh.com # http://www.openssh.com/txt/draft-miller-secsh-compression-delayed-00.txt
hostkey:
#- ssh-rsa-cert-v00@openssh.com # obsolete
#- ssh-dss-cert-v00@openssh.com # obsolete
#- ssh-dsa-cert-v00@openssh.com # obsolete, never (?) implemented
mac:
- umac-64@openssh.com # openssh/PROTOCOL
- umac-128@openssh.com
#- hmac-ripemd160@openssh.com # Undocumented? openssh/myproposal.h
#- hmac-ripemd160 # Undocumented? openssh/myproposal.h
# ETM modes of existing macs:
- hmac-md5-etm@openssh.com
- hmac-md5-96-etm@openssh.com
- hmac-sha1-etm@openssh.com
- hmac-sha1-96-etm@openssh.com
- hmac-sha2-256-etm@openssh.com
- hmac-sha2-512-etm@openssh.com
- umac-64-etm@openssh.com
- umac-128-etm@openssh.com
#- hmac-ripemd160-etm@openssh.com # Undocumented? openssh/myproposal.h
kex:
- kex-strict-c-v00@openssh.com
- kex-strict-s-v00@openssh.com
- sntrup761x25519-sha512@openssh.com # see also https://www.openssh.com/txt/release-9.0
userauth:
- publickey-hostbound-v00@openssh.com
extension:
- ext-info-in-auth@openssh.com
- ping@openssh.com
- publickey-hostbound@openssh.com
openssh-chacha:
name: OpenSSH
url: https://cvsweb.openbsd.org/src/usr.bin/ssh/PROTOCOL.chacha20poly1305?annotate=HEAD
title: "OpenSSH: chacha20poly1305"
protocols:
cipher:
- chacha20-poly1305@openssh.com
openssh-certkeys:
name: OpenSSH
url: https://cvsweb.openbsd.org/src/usr.bin/ssh/PROTOCOL.certkeys?annotate=HEAD
title: "OpenSSH: certkeys"
protocols:
hostkey:
- ssh-rsa-cert-v01@openssh.com
- ssh-dss-cert-v01@openssh.com
- ecdsa-sha2-nistp256-cert-v01@openssh.com
- ecdsa-sha2-nistp384-cert-v01@openssh.com
- ecdsa-sha2-nistp521-cert-v01@openssh.com
- ssh-ed25519-cert-v01@openssh.com
- rsa-sha2-256-cert-v01@openssh.com
- rsa-sha2-512-cert-v01@openssh.com
openssh-u2f:
name: OpenSSH
url: https://cvsweb.openbsd.org/src/usr.bin/ssh/PROTOCOL.u2f?annotate=HEAD
title: "OpenSSH: U2F"
protocols:
hostkey:
- sk-ecdsa-sha2-nistp256@openssh.com
- sk-ecdsa-sha2-nistp256-cert-v01@openssh.com
- sk-ssh-ed25519@openssh.com
- sk-ssh-ed25519-cert-v01@openssh.com