Switch to secure signing algorithm for SSH secrets engine #14006
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cipherboy
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cryptosec
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secret/ssh
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cipherboy
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Feb 14, 2022
cipherboy
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Feb 14, 2022
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stevendpclark
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Feb 17, 2022
Related: #11608 Signed-off-by: Alexander Scheel <alex.scheel@hashicorp.com>
As mentioned in the OpenSSH 8.2 release notes, OpenSSH will no longer be accepting ssh-rsa signatures by default as these use the insecure SHA-1 algorithm. For roles in which an explicit signature type wasn't specified, we should change the default from SHA-1 to SHA-256 for security and compatibility with modern OpenSSH releases. See also: https://www.openssh.com/txt/release-8.2 Signed-off-by: Alexander Scheel <alex.scheel@hashicorp.com>
Signed-off-by: Alexander Scheel <alex.scheel@hashicorp.com>
Signed-off-by: Alexander Scheel <alex.scheel@hashicorp.com>
Signed-off-by: Alexander Scheel <alex.scheel@hashicorp.com>
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Thanks @stevendpclark for the reviews! |
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Built on top of #13991; will be rebased once that merges.The default (empty) value for RSA keys,
ssh-rsa, is an insecure default because it uses SHA-1 signing. This has lead to its removal from OpenSSH >= 8.2's default algorithm list. However, the more secure, modern signing algorithms for SSH keys,rsa-sha2-256andrsa-sha2-512, aren't available on platforms with OpenSSH < 7.2.This PR takes an approach of migrating existing SSH roles using the default (empty) value to an explicit
ssh-rsavalue and changing the default todefault, which can change over time as secure defaults change. This explicitdefaultvalue presently usesrsa-sha2-256. Roles can of course still explicitly specify a value if desired.Documentation has been clarified to point out that the legacy value is insecure, what the secure value presently is, and what will occur as a result of migration.
This is motivated by #11608.
Resolves: #11608