最近我们开始从 ubuntu18.04 fips 升级到 ubuntu 20.04 fips 镜像，我使用了 aws 市场镜像 ubuntu-pro-fips-server/images/hvm-ssd/ubuntu-focal-20.04-amd64-pro-fips-server，我们使用 Netfilx bless 工具进行 ssh，它仍然适用于 18.04 FIPS 和非 FIPS 的 20.04，
但是我收到“userauth_pubkey：证书签名算法 ssh-rsa：不支持签名算法 [preauth]”，
但为了测试这个 bless 工具，我使用相同的算法 ssh-rsa 和相同的位手动创建了证书，并且我能够使用该密钥进行 ssh（我使用的带有签名 CA 证书选项的 ssh），但不能使用 bless 密钥
root@hostname:/var/snap/amazon-ssm-agent/6563# ssh -Q key
ssh-ed25519
[email protected]
[email protected]
[email protected]
ssh-rsa
ssh-dss
ecdsa-sha2-nistp256
ecdsa-sha2-nistp384
ecdsa-sha2-nistp521
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
我从堡垒收到此错误，没有更多身份验证方法可供尝试。ubuntu@graviton-test-bastion-20-fips-0c3f60d2：权限被拒绝（公钥）。
SSH SERVER LOGS:
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11415]: debug1: Forked child 11417.
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: Set /proc/self/oom_score_adj to 0
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: rexec start in 5 out 5 newsock 5 pipe 7 sock 8
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: inetd sockets after dupping: 4, 4
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: Connection from 10.X.X.X port 16130 on 10.X.X.X port 22 rdomain ""
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: Local version string SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.fips.0.2.1
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: Remote protocol version 2.0, remote software version OpenSSH_7.6p1 Ubuntu-4ubuntu0.7
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: match: OpenSSH_7.6p1 Ubuntu-4ubuntu0.7 pat OpenSSH_7.0*,OpenSSH_7.1*,OpenSSH_7.2*,OpenSSH_7.3*,OpenSSH_7.4*,OpenSSH_7.5*,OpenSSH_7.6*,OpenSSH_7.7* compat 0x04000002
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: permanently_set_uid: 109/65534 [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: list_hostkey_types: rsa-sha2-512,rsa-sha2-256,ssh-rsa,ecdsa-sha2-nistp256,ssh-ed25519 [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: SSH2_MSG_KEXINIT sent [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: SSH2_MSG_KEXINIT received [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: kex: algorithm: curve25519-sha256 [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: kex: host key algorithm: ecdsa-sha2-nistp256 [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: expecting SSH2_MSG_KEX_ECDH_INIT [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: rekey out after 134217728 blocks [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: SSH2_MSG_NEWKEYS sent [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: Sending SSH2_MSG_EXT_INFO [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: expecting SSH2_MSG_NEWKEYS [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: SSH2_MSG_NEWKEYS received [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: rekey in after 134217728 blocks [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: KEX done [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: userauth-request for user ubuntu service ssh-connection method none [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: attempt 0 failures 0 [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: PAM: initializing for "ubuntu"
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: PAM: setting PAM_RHOST to "10.X.X.X"
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: PAM: setting PAM_TTY to "ssh"
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: userauth_send_banner: sent [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: userauth-request for user ubuntu service ssh-connection method publickey [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: attempt 1 failures 0 [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: userauth_pubkey: test pkalg rsa-sha2-512 pkblob RSA SHA256:eDIkE2MsPXLsxp5tG5jeQLQ+E/tdypLNxQk4nBEEfUM [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: temporarily_use_uid: 1000/1000 (e=0/0)
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: trying public key file /home/ubuntu/.ssh/authorized_keys
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: fd 5 clearing O_NONBLOCK
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: restore_uid: 0/0
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: temporarily_use_uid: 1000/1000 (e=0/0)
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: trying public key file /home/ubuntu/.ssh/authorized_keys2
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: Could not open authorized keys '/home/ubuntu/.ssh/authorized_keys2': No such file or directory
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: restore_uid: 0/0
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: temporarily_use_uid: 112/65534 (e=0/0)
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: restore_uid: 0/0
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: temporarily_use_uid: 112/65534 (e=0/0)
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: AuthorizedKeysCommand /usr/share/ec2-instance-connect/eic_run_authorized_keys ubuntu SHA256:XXXXXpLNxQk4nBEEfUM failed, status 22
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: restore_uid: 0/0
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: Failed publickey for ubuntu from 10.X.X.X port 16130 ssh2: RSA SHA256:XXXXXXXXXEEfUM
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: userauth-request for user ubuntu service ssh-connection method publickey [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: debug1: attempt 2 failures 1 [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: userauth_pubkey: certificate signature algorithm ssh-rsa: signature algorithm not supported [preauth]
Jul 1 04:09:32 graviton-test-bastion-20-fips-0c3f60d2 sshd[11417]: Connection closed by authenticating user ubuntu 10.88.67.39 port 16130 [preauth]