Ssh
SSH - 權限被拒絕（公鑰）
這是另一個 SSH 問題。它在更新到 Fedora 33 之前有效，但現在它沒有，這讓我相信這是一個客戶端問題。有人在日誌中看到可以提供線索的東西嗎？不幸的是，我只是一個業餘愛好者，而不是專家。
ssh -vvv 日誌：
ssh testuser@testserver -vvv OpenSSH_8.4p1, OpenSSL 1.1.1k FIPS 25 Mar 2021 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 20: Applying options for * debug3: /etc/ssh/ssh_config line 55: Including file /etc/ssh/ssh_config.d/50-redhat.conf depth 0 debug1: Reading configuration data /etc/ssh/ssh_config.d/50-redhat.conf debug2: checking match for 'final all' host testserver originally testserver debug3: /etc/ssh/ssh_config.d/50-redhat.conf line 3: not matched 'final' debug2: match not found debug3: /etc/ssh/ssh_config.d/50-redhat.conf line 5: Including file /etc/crypto-policies/back-ends/openssh.config depth 1 (parse only) debug1: Reading configuration data /etc/crypto-policies/back-ends/openssh.config debug3: gss kex names ok: [gss-curve25519-sha256-,gss-nistp256-sha256-,gss-group14-sha256-,gss-group16-sha512-] debug3: kex names ok: [curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512] debug1: configuration requests final Match pass debug1: re-parsing configuration debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 20: Applying options for * debug3: /etc/ssh/ssh_config line 55: Including file /etc/ssh/ssh_config.d/50-redhat.conf depth 0 debug1: Reading configuration data /etc/ssh/ssh_config.d/50-redhat.conf debug2: checking match for 'final all' host testserver originally testserver debug3: /etc/ssh/ssh_config.d/50-redhat.conf line 3: matched 'final' debug2: match found debug3: /etc/ssh/ssh_config.d/50-redhat.conf line 5: Including file /etc/crypto-policies/back-ends/openssh.config depth 1 debug1: Reading configuration data /etc/crypto-policies/back-ends/openssh.config debug3: gss kex names ok: [gss-curve25519-sha256-,gss-nistp256-sha256-,gss-group14-sha256-,gss-group16-sha512-] debug3: kex names ok: [curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512] debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/home/test/.ssh/known_hosts' debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/home/test/.ssh/known_hosts2' debug2: resolving "testserver" port 22 debug2: ssh_connect_direct debug1: Connecting to testserver [111.111.111.111] port 22. debug1: Connection established. debug1: identity file /home/test/.ssh/id_rsa type -1 debug1: identity file /home/test/.ssh/id_rsa-cert type -1 debug1: identity file /home/test/.ssh/id_dsa type -1 debug1: identity file /home/test/.ssh/id_dsa-cert type -1 debug1: identity file /home/test/.ssh/id_ecdsa type -1 debug1: identity file /home/test/.ssh/id_ecdsa-cert type -1 debug1: identity file /home/test/.ssh/id_ecdsa_sk type -1 debug1: identity file /home/test/.ssh/id_ecdsa_sk-cert type -1 debug1: identity file /home/test/.ssh/id_ed25519 type -1 debug1: identity file /home/test/.ssh/id_ed25519-cert type -1 debug1: identity file /home/test/.ssh/id_ed25519_sk type -1 debug1: identity file /home/test/.ssh/id_ed25519_sk-cert type -1 debug1: identity file /home/test/.ssh/id_xmss type -1 debug1: identity file /home/test/.ssh/id_xmss-cert type -1 debug1: Local version string SSH-2.0-OpenSSH_8.4 debug1: Remote protocol version 2.0, remote software version OpenSSH_6.7p1 Debian-5+deb8u8 debug1: match: OpenSSH_6.7p1 Debian-5+deb8u8 pat OpenSSH* compat 0x04000000 debug2: fd 4 setting O_NONBLOCK debug1: Authenticating to testserver:22 as 'testuser' debug3: hostkeys_foreach: reading file "/home/test/.ssh/known_hosts" debug3: record_hostkey: found key type ECDSA in file /home/test/.ssh/known_hosts:1 debug3: load_hostkeys: loaded 1 keys from testserver debug3: order_hostkeyalgs: have matching best-preference key type ecdsa-sha2-nistp256-cert-v01@openssh.com, using HostkeyAlgorithms verbatim debug3: send packet: type 20 debug1: SSH2_MSG_KEXINIT sent debug3: receive packet: type 20 debug1: SSH2_MSG_KEXINIT received debug2: local client KEXINIT proposal debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,ext-info-c debug2: host key algorithms: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ecdsa-sha2-nistp256@openssh.com,ssh-ed25519,sk-ssh-ed25519@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa debug2: ciphers ctos: aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,3des-cbc debug2: ciphers stoc: aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,3des-cbc debug2: MACs ctos: hmac-sha2-256-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha2-256,hmac-sha1,umac-128@openssh.com,hmac-sha2-512 debug2: MACs stoc: hmac-sha2-256-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha2-256,hmac-sha1,umac-128@openssh.com,hmac-sha2-512 debug2: compression ctos: none,zlib@openssh.com,zlib debug2: compression stoc: none,zlib@openssh.com,zlib debug2: languages ctos: debug2: languages stoc: debug2: first_kex_follows 0 debug2: reserved 0 debug2: peer server KEXINIT proposal debug2: KEX algorithms: curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1 debug2: host key algorithms: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256 debug2: ciphers ctos: aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com debug2: ciphers stoc: aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: compression ctos: none,zlib@openssh.com debug2: compression stoc: none,zlib@openssh.com debug2: languages ctos: debug2: languages stoc: debug2: first_kex_follows 0 debug2: reserved 0 debug1: kex: algorithm: curve25519-sha256@libssh.org debug1: kex: host key algorithm: ecdsa-sha2-nistp256 debug1: kex: server->client cipher: aes128-ctr MAC: hmac-sha2-256-etm@openssh.com compression: none debug1: kex: client->server cipher: aes128-ctr MAC: hmac-sha2-256-etm@openssh.com compression: none debug1: kex: curve25519-sha256@libssh.org need=32 dh_need=32 debug1: kex: curve25519-sha256@libssh.org need=32 dh_need=32 debug3: send packet: type 30 debug1: expecting SSH2_MSG_KEX_ECDH_REPLY debug3: receive packet: type 31 debug1: Server host key: ecdsa-sha2-nistp256 SHA256:IM4bKknzoKNTV6xGlCYGhs0e0VwhgOhDIdQO7AmJeQQ debug3: hostkeys_foreach: reading file "/home/test/.ssh/known_hosts" debug3: record_hostkey: found key type ECDSA in file /home/test/.ssh/known_hosts:1 debug3: load_hostkeys: loaded 1 keys from testserver debug3: hostkeys_foreach: reading file "/home/test/.ssh/known_hosts" debug3: record_hostkey: found key type ECDSA in file /home/test/.ssh/known_hosts:1 debug3: load_hostkeys: loaded 1 keys from 111.111.111.111 debug1: Host 'testserver' is known and matches the ECDSA host key. debug1: Found key in /home/test/.ssh/known_hosts:1 debug3: send packet: type 21 debug2: set_newkeys: mode 1 debug1: rekey out after 4294967296 blocks debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug3: receive packet: type 21 debug1: SSH2_MSG_NEWKEYS received debug2: set_newkeys: mode 0 debug1: rekey in after 4294967296 blocks debug1: Will attempt key: testuser@testserver RSA SHA256:WWWWWWWWWWWWWWWWW agent debug1: Will attempt key: /home/test/.ssh/id_rsa debug1: Will attempt key: /home/test/.ssh/id_dsa debug1: Will attempt key: /home/test/.ssh/id_ecdsa debug1: Will attempt key: /home/test/.ssh/id_ecdsa_sk debug1: Will attempt key: /home/test/.ssh/id_ed25519 debug1: Will attempt key: /home/test/.ssh/id_ed25519_sk debug1: Will attempt key: /home/test/.ssh/id_xmss debug2: pubkey_prepare: done debug3: send packet: type 5 debug3: receive packet: type 6 debug2: service_accept: ssh-userauth debug1: SSH2_MSG_SERVICE_ACCEPT received debug3: send packet: type 50 debug3: receive packet: type 51 debug1: Authentications that can continue: publickey debug3: start over, passed a different list publickey debug3: preferred gssapi-with-mic,publickey,keyboard-interactive,password debug3: authmethod_lookup publickey debug3: remaining preferred: keyboard-interactive,password debug3: authmethod_is_enabled publickey debug1: Next authentication method: publickey debug1: Offering public key: testuser@testserver RSA SHA256:WWWWWWWWWWWWWWWWW agent debug1: send_pubkey_test: no mutual signature algorithm debug1: Trying private key: /home/test/.ssh/id_rsa debug3: no such identity: /home/test/.ssh/id_rsa: No such file or directory debug1: Trying private key: /home/test/.ssh/id_dsa debug3: no such identity: /home/test/.ssh/id_dsa: No such file or directory debug1: Trying private key: /home/test/.ssh/id_ecdsa debug3: no such identity: /home/test/.ssh/id_ecdsa: No such file or directory debug1: Trying private key: /home/test/.ssh/id_ecdsa_sk debug3: no such identity: /home/test/.ssh/id_ecdsa_sk: No such file or directory debug1: Trying private key: /home/test/.ssh/id_ed25519 debug3: no such identity: /home/test/.ssh/id_ed25519: No such file or directory debug1: Trying private key: /home/test/.ssh/id_ed25519_sk debug3: no such identity: /home/test/.ssh/id_ed25519_sk: No such file or directory debug1: Trying private key: /home/test/.ssh/id_xmss debug3: no such identity: /home/test/.ssh/id_xmss: No such file or directory debug2: we did not send a packet, disable method debug1: No more authentication methods to try. testuser@testserver: Permission denied (publickey).幾乎是唯一一個暗示伺服器日誌的伺服器日誌條目：
testserver sshd[1111]: Connection closed by ip [preauth]這是一台舊的 debian 機器，如果這能提供任何線索的話。
RedHat 管理髮行版的最新版本禁用了一些被認為過時或不安全的加密算法。
從線路來看：
debug1: send_pubkey_test: no mutual signature algorithm您的伺服器可能正在使用這些禁用的算法之一，並且不允許您的客戶認為安全的東西。
系統範圍的加密配置由
update-crypto-policies命令設置，預設為DEFAULT.您可以通過降級到 LEGACY 加密策略來啟用大多數（如果不是全部）過時/不安全的算法：
update-crypto-policies --set LEGACY綜上所述，請考慮將您的舊伺服器升級到更現代的伺服器。