Generate Etc Ssh Ssh_host_dsa_key
(In reply to Michal Jaegermann from comment #22) but that does nothing to keys which happened to be installed earlierautomatically or otherwise, so one ends up in /etc/ssh/ with 'root root' ownership on all.key files with an exception of sshhostecdsakey, which has 'root sshkeys', and '600' permissions on those. That despite of 'use correct permissions on ecdsa host key' changelog entry. Jun 09, 2018 Most Linux and Unix distribution create ssh keys for you during the installation of the OpenSSH server package. But it may be useful to be able re-generate new server keys from time to time. For example, when you duplicate VM (KVM or container) which contains an installed ssh package and you need to use different keys from cloned KVM VM guest/machine. How to Generate a Public/Private Key Pair for Use With Solaris Secure Shell. Users must generate a public/private key pair when their site implements host-based authentication.
Apr 30, 2018 Server Fault asked. I’m trying to re-generate ssh host keys on a handful of remote servers via ansible (and ssh-keygen), but the files don’t seem to be showing up.The playbook runs OK, but the files on the remote are not altered.
SSH keys can serve as a means of identifying yourself to an SSH server using public-key cryptography and challenge-response authentication.The major advantage of key-based authentication is that in contrast to password authentication it is not prone to brute-force attacks and you do not expose valid credentials, if the server has been compromised. This article provides information on how to generate SSH host keys using various commands in shell mode. Symptoms: You may not be able to connect to a Junos router/switch/firewall and see the following log messages on the device.
How to Set Up Host-Based Authentication for Secure Shell
The following procedure sets up a public key system where the client's public key is used forauthentication on the server. The user must also create a public/private key pair.
In the procedure, the terms client and local hostrefer to the system where a user types the ssh command. The termsserver and remote host refer to the system that the clientis trying to reach.
Before You Begin
You must assume the root role. For more information, see Using Your Assigned Administrative Rights in Securing Users and Processes in Oracle Solaris 11.2.
- On the client, enable host-based authentication.
In the client configuration file, /etc/ssh/ssh_config, type the followingentry:
For the syntax of the file, see the ssh_config(4) man page.
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- On the server, enable host-based authentication.
In the server configuration file, /etc/ssh/sshd_config, type the sameentry:
For the syntax of the file, see the sshd_config(4) man page.
- On the server, either you or the user should configure a file that enables the client to be recognized as a trusted host.
For more information, see the FILES section of the sshd(1M) man page.
- If you are doing the configuration, add the client as an entry to the server's /etc/ssh/shosts.equiv file.
- If your users are doing the configuration, they should add an entry for the client to their ~/.shosts file on the server.
- On the server, ensure that the sshd daemon can access the list of trustedhosts.
Set IgnoreRhosts to no in the/etc/ssh/sshd_config file.
- Ensure that users of Secure Shell at your site have accounts on both hosts.
- Put the client's public key on the server using one of the following methods:
- Modify the sshd_config file on the server, then instruct your users to addthe client's public host keys to their ~/.ssh/known_hosts file.
For user instructions, see How to Generate aPublic/Private Key Pair for Use With Secure Shell.
- Copy the client's public key to the server.
The host keys are stored in the /etc/ssh directory. The keys aretypically generated by the sshd daemon on first boot.
- Add the key to the /etc/ssh/ssh_known_hosts file on the server.
On the client, type the following command on one line with no backslash.
Note - If host keys are missing from the server, using Secure Shell generates an error messagesimilar to the following: - When you are prompted, supply your login password.
When the file is copied, the message “Host key copied” is displayed.
Each line in the /etc/ssh/ssh_known_hosts file consists of fields thatare separated by spaces:
- Edit the /etc/ssh/ssh_known_hosts file and addRemoteHost as the first field in the copied entry.
- Add the key to the /etc/ssh/ssh_known_hosts file on the server.
- Modify the sshd_config file on the server, then instruct your users to addthe client's public host keys to their ~/.ssh/known_hosts file.
On each host, the Secure Shell configuration files contain the following entries:
On each host, the shosts.equiv file contains an entry for the otherhost:
The public key for each host is in the /etc/ssh/ssh_known_hosts file onthe other host:
Users have an account on both hosts. For example, the following information would appear for user John Doe:
In the following example, each host is configured as a server and as a client. A user oneither host can initiate an ssh connection to the other host. The followingconfiguration makes each host a server and a client:
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How to Generate a Public/Private KeyPair for Use With Solaris Secure Shell
Users must generate a public/private key pair when their site implementshost-based authentication or user public-key authentication. For additionaloptions, see the ssh-keygen(1) manpage.
Before You Begin
Create New Ssh Key
Determine from your system administrator if host-based authenticationis configured.
Start the key generation program.
where -t is the type of algorithm, one of rsa, dsa, or rsa1.
Specify the path to the file that will hold the key.
Bydefault, the file name id_rsa, which represents an RSAv2 key, appears in parentheses. You can select this file by pressing the Return key. Or, you can type an alternative file name.
The file name of the public key is created automatically by appendingthe string .pub to the name of the private key file.
Type a passphrase for using your key.
This passphraseis used for encrypting your private key. A null entry is stronglydiscouraged. Note that the passphrase is not displayed when youtype it in.
Retype the passphrase to confirm it.
Check the results.
Check that the path to the keyfile is correct.
At this point, you have created a public/private key pair.
Choose the appropriate option:
If your administrator has configuredhost-based authentication, you might need to copy the local host's publickey to the remote host.
You can now log in to the remote host.For details, see How to Log In to a Remote Host With Solaris Secure Shell.
Type the command on one line with no backslash.
When you are prompted, supply your login password.
If your site uses user authentication with public keys, populateyour authorized_keys file on the remote host.
Copy your public key to the remote host.
Type thecommand on one line with no backslash.
When you are prompted, supply your login password.
Whenthe file is copied, the message “Key copied” is displayed.
(Optional) Reduce the prompting for passphrases.
For a procedure, see How to Reduce Password Prompts in Solaris Secure Shell. For more information, see the ssh-agent(1) and ssh-add(1) man pages.
Example 19–2 Establishing a v1 RSA Key for a User
Generate Etc Ssh Ssh_host_dsa_key Free
In the following example, the user cancontact hosts that run v1 of the Solaris Secure Shell protocol. To be authenticated by v1hosts, the user creates a v1 key, then copies the public key portion to theremote host.