Unable to negotiate with XX.XXX.XX.XX: no matching host key type found. Their offer: ssh-dss

问题:

I am trying to create a git repository on my web host and clone it on my computer. Here's what I did:

1. I created a repository on the remote server.
2. I generated a key pair: ssh-keygen -t dsa.
3. I added my key to ssh-agent.
4. I copied to the server public key in ~/.ssh.

And then, after an attempt to run the command git clone ssh://user@host/path-to-repository, I get an error:

Unable to negotiate with XX.XXX.XX.XX: no matching host key type found. Their offer: ssh-dss
fatal: Could not read from remote repository.
Please make sure you have the correct access rights and the repository exists.

What does that mean?

回答1:

The recent openssh version deprecated DSA keys by default. You should suggest to your GIT provider to add some reasonable host key. Relying only on DSA is not a good idea.

As a workaround, you need to tell your ssh client that you want to accept DSA host keys, as described in the official documentation for legacy usage. You have few possibilities, but I recommend to add these lines into your ~/.ssh/config file:

Host your-remote-host     HostkeyAlgorithms +ssh-dss 

Other possibility is to use environment variable GIT_SSH to specify these options:

GIT_SSH_COMMAND="ssh -oHostKeyAlgorithms=+ssh-dss" git clone ssh://user@host/path-to-repository 

回答2:

You can also add -oHostKeyAlgorithms=+ssh-dss in your ssh line:

ssh -oHostKeyAlgorithms=+ssh-dss user@host 

回答3:

For me this worked: (added into .ssh\config)

Host * HostkeyAlgorithms +ssh-dss PubkeyAcceptedKeyTypes +ssh-dss 

回答4:

If you're like me, and would rather not make this security hole system or user-wide, then you can add a config option to any git repos that need this by running this command in those repos. (note only works with git version >= 2.10, released 2016-09-04)

git config core.sshCommand 'ssh -oHostKeyAlgorithms=+ssh-dss' 

This only works after the repo is setup however. If you're not comfortable adding a remote manually (and just want to clone) then you can run the clone like this:

GIT_SSH_COMMAND='ssh -oHostKeyAlgorithms=+ssh-dss' git clone ssh://user@host/path-to-repository 

then run the first command to make it permanent.

If you don't have the latest, and still would like to keep the hole as local as possible I recommend putting

export GIT_SSH_COMMAND='ssh -oHostKeyAlgorithms=+ssh-dss' 

in a file somewhere, say git_ssh_allow_dsa_keys.sh, and sourceing it when needed.

回答5:

I want to collaborate a little with the solution for the server side. So, the server is saying it does not support DSA, this is because the openssh client does not activate it by default:

OpenSSH 7.0 and greater similarly disable the ssh-dss (DSA) public key algorithm. It too is weak and we recommend against its use.

So, to fix this this in the server side I should activate other Key algorithms like RSA o ECDSA. I just had this problem with a server in a lan. I suggest the following:

Update the openssh:

yum update openssh-server 

Merge new configurations in the sshd_config if there is a sshd_config.rpmnew.

Verify there are hosts keys at /etc/ssh/. If not generate new ones, see man ssh-keygen.

$ ll /etc/ssh/ total 580 -rw-r--r--. 1 root root     553185 Mar  3  2017 moduli -rw-r--r--. 1 root root       1874 Mar  3  2017 ssh_config drwxr-xr-x. 2 root root       4096 Apr 17 17:56 ssh_config.d -rw-------. 1 root root       3887 Mar  3  2017 sshd_config -rw-r-----. 1 root ssh_keys    227 Aug 30 15:33 ssh_host_ecdsa_key -rw-r--r--. 1 root root        162 Aug 30 15:33 ssh_host_ecdsa_key.pub -rw-r-----. 1 root ssh_keys    387 Aug 30 15:33 ssh_host_ed25519_key -rw-r--r--. 1 root root         82 Aug 30 15:33 ssh_host_ed25519_key.pub -rw-r-----. 1 root ssh_keys   1675 Aug 30 15:33 ssh_host_rsa_key -rw-r--r--. 1 root root        382 Aug 30 15:33 ssh_host_rsa_key.pub 

Verify in the /etc/ssh/sshd_config the HostKey configuration. It should allow the configuration of RSA and ECDSA. (If all of them are commented by default it will allow too the RSA, see in man sshd_config the part of HostKey).

# HostKey for protocol version 1 #HostKey /etc/ssh/ssh_host_key # HostKeys for protocol version 2 HostKey /etc/ssh/ssh_host_rsa_key #HostKey /etc/ssh/ssh_host_dsa_key HostKey /etc/ssh/ssh_host_ecdsa_key HostKey /etc/ssh/ssh_host_ed25519_key 

For the client side, create a key for ssh (not a DSA like in the question) by just doing this:

ssh-keygen 

After this, because there are more options than ssh-dss(DSA) the client openssh (>=v7) should connect with RSA or better algorithm.

Here another good article.

This is my first question answered, I welcome suggestions :D .

回答6:

You either follow above approach or this one

Create the config file in the .ssh directory and add these line.

host xxx.xxx  Hostname xxx.xxx  IdentityFile ~/.ssh/id_rsa  User xxx  KexAlgorithms +diffie-hellman-group1-sha1 

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