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roles/common: Tweak sshd_config to match NSA Suite B recommendations

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NSA stopped recommending AES-128 in August, 2015...

Before: https://web.archive.org/web/20150403110658/https://www.nsa.gov/ia/programs/suiteb_cryptography/index.shtml
After: https://web.archive.org/web/20150815072948/https://www.nsa.gov/ia/programs/suiteb_cryptography/index.shtml

I don't see why we shouldn't follow suit; maybe they know something
we don't!

Signed-off-by: Alan Orth <alan.orth@gmail.com>
This commit is contained in:
Alan Orth 2015-09-02 16:55:51 +03:00
parent 5c0a7c2c72
commit 973b37be4e
Signed by: alanorth
GPG Key ID: 0FB860CC9C45B1B9
3 changed files with 15 additions and 9 deletions
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8
roles/common/templates/sshd_config_Debian-8.j2
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@ -85,9 +85,11 @@ Subsystem sftp /usr/lib/openssh/sftp-server
# and ChallengeResponseAuthentication to 'no'. # and ChallengeResponseAuthentication to 'no'.
UsePAM yes UsePAM yes
# https://stribika.github.io/2015/01/04/secure-secure-shell.html # Originally from: https://stribika.github.io/2015/01/04/secure-secure-shell.html
Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes128-ctr # ... but with ciphers and MACs with < 256 bits removed, as NSA's Suite B now
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-ripemd160-etm@openssh.com,umac-128-etm@openssh.com # does away with these! See: https://www.nsa.gov/ia/programs/suiteb_cryptography/index.shtml
Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes256-ctr
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com
KexAlgorithms curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256 KexAlgorithms curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256
# only allow shell access by provisioning user # only allow shell access by provisioning user

8
roles/common/templates/sshd_config_Ubuntu-14.04.j2
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@ -85,9 +85,11 @@ Subsystem sftp /usr/lib/openssh/sftp-server
# and ChallengeResponseAuthentication to 'no'. # and ChallengeResponseAuthentication to 'no'.
UsePAM yes UsePAM yes
# https://stribika.github.io/2015/01/04/secure-secure-shell.html # Originally from: https://stribika.github.io/2015/01/04/secure-secure-shell.html
Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes128-ctr # ... but with ciphers and MACs with < 256 bits removed, as NSA's Suite B now
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-ripemd160-etm@openssh.com,umac-128-etm@openssh.com # does away with these! See: https://www.nsa.gov/ia/programs/suiteb_cryptography/index.shtml
Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes256-ctr
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com
KexAlgorithms curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256 KexAlgorithms curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256
# only allow shell access by provisioning user # only allow shell access by provisioning user

8
roles/common/templates/sshd_config_Ubuntu-15.04.j2
View File

@ -85,9 +85,11 @@ Subsystem sftp /usr/lib/openssh/sftp-server
# and ChallengeResponseAuthentication to 'no'. # and ChallengeResponseAuthentication to 'no'.
UsePAM yes UsePAM yes
# https://stribika.github.io/2015/01/04/secure-secure-shell.html # Originally from: https://stribika.github.io/2015/01/04/secure-secure-shell.html
Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes128-ctr # ... but with ciphers and MACs with < 256 bits removed, as NSA's Suite B now
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-ripemd160-etm@openssh.com,umac-128-etm@openssh.com # does away with these! See: https://www.nsa.gov/ia/programs/suiteb_cryptography/index.shtml
Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes256-ctr
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com
KexAlgorithms curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256 KexAlgorithms curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256
# only allow shell access by provisioning user # only allow shell access by provisioning user