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git - 升级 Fedora 33 后 ssh 权限被拒绝（公钥）

问题描述

我一直在尝试这个 Stackoverlow 问题的许多答案，就像我现在问的一样，但仍然无法解决我的问题，我试图通过ssh克隆但总是得到Permission denied (publickey)

当我跑步时GIT_SSH_COMMAND="ssh -vvv" git clone git@bitbucket.org:myusername/my-api.git 

debug1: kex: algorithm: curve25519-sha256@libssh.org
debug1: kex: host key algorithm: ssh-rsa
debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: curve25519-sha256@libssh.org need=64 dh_need=64
debug1: kex: curve25519-sha256@libssh.org need=64 dh_need=64
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ssh-rsa SHA256:kkXQOXSRBEiUtuE8AikLLLwbHaxvSc0ojez9YXaGp2A
debug3: hostkeys_foreach: reading file "/home/alienwarepocket/.ssh/known_hosts"
debug3: record_hostkey: found key type RSA in file /home/alienwarepocket/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from bitbucket.org
debug3: hostkeys_foreach: reading file "/home/alienwarepocket/.ssh/known_hosts"
debug3: record_hostkey: found key type RSA in file /home/alienwarepocket/.ssh/known_hosts:3
debug3: load_hostkeys: loaded 1 keys from 18.205.93.2
debug1: Host 'bitbucket.org' is known and matches the RSA host key.
debug1: Found key in /home/alienwarepocket/.ssh/known_hosts:1
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey out after 134217728 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 134217728 blocks
debug1: Will attempt key: /home/alienwarepocket/.ssh/id_rsa RSA SHA256:ktMzaalYyvU9Ev1bgELXatabkUkdcT828O0PppnNiV4M explicit agent
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: /home/alienwarepocket/.ssh/id_rsa RSA SHA256:ktMzaalYyvU9Ev1bgELXatabkUkdcT828O0PppnNiV4M explicit agent
debug1: send_pubkey_test: no mutual signature algorithm
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
git@bitbucket.org: Permission denied (publickey).
fatal: Could not read from remote repository.

升级 Fedora 33 后，我遇到了这个问题，这在 Fedora 32 上没有问题

标签： gitsshbitbucketrsafedora

解决方案

这可能与“ Fedora33 中的 Changes/StrongCryptoSettings2 ”有关

默认策略的更改是：

  • 仅保留 TLS 1.2（和可用的 TLS 1.3）作为启用的协议，并将 TLS 1.x, x<=1 移动到旧级别。
  • 在默认设置中需要 2048 及更多的有限域参数（RSA、Diffie-Hellman）
  • 禁用 SHA1 支持以用于签名（X.509 证书、TLS、IPSEC 握手）

上述链接的“升级/兼容性影响”部分明确提到：

新设置可能会破坏连接到使用弱算法的服务器的软件。
可以通过将系统切换到 Fedora 32 策略级别来获得兼容性：

update-crypto-policies --set DEFAULT:FEDORA32

但不推荐：如果您可以使用 ed25519，那就更好了。

正如Peque的回答中提到的，您可以添加~/.ssh/config最初找到的选项in sshd_config

 PubkeyAcceptedKeyTypes
         Specifies the key types that will be accepted for public key
         authentication as a list of comma-separated patterns.

因此，如果您不能使用 ed25519，您可以，对于一个特定的主机，允许使用以下id_rsa密钥：

Host aHost
    Hostname a.hostname.com
    PubkeyAcceptedKeyTypes +ssh-rsa

最后：升级后仔细检查您的权限：

  • ~/.ssh是775 drwxrwxr-x。
  • ~/.ssh/id_rsa是600 -rw-------。
  • ~/.ssh/id_rsa.pub是644 -rw-r--r--。
  • ~/.ssh/config是600 -rw-------。
  • ~/.ssh/authorized_keys在远程服务器上是600 -rw-------

但是ssh-keygen -t ed25519现在似乎建议使用密钥。

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