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How to install public key in host server

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2

1

My user from another server gave his public key to me and asked me to install this public key into my server so he can connect to my server. Did some research and I have to create a directory called .ssh and paste my user public key in a Notepad and save this text file into the .ssh directory. My question is does my research correct if so where and how I create this .ssh directory and the key file, is it in text file format? Do I have to pass any information like my key to the user?

ssh openssh sftp

share|improve this question

edited 2 hours ago

Martin Prikryl

11.3k43379

asked 3 hours ago

xChaaxxChaax

112

New contributor

xChaax is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If the user is already a user on your server (has password authentication working), he/she can setup the public key on his/her own.
  
  – Martin Prikryl
  2 hours ago
  

  
  
  
  

add a comment | 

2

1

My user from another server gave his public key to me and asked me to install this public key into my server so he can connect to my server. Did some research and I have to create a directory called .ssh and paste my user public key in a Notepad and save this text file into the .ssh directory. My question is does my research correct if so where and how I create this .ssh directory and the key file, is it in text file format? Do I have to pass any information like my key to the user?

ssh openssh sftp

share|improve this question

edited 2 hours ago

Martin Prikryl

11.3k43379

asked 3 hours ago

xChaaxxChaax

112

New contributor

xChaax is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If the user is already a user on your server (has password authentication working), he/she can setup the public key on his/her own.
  
  – Martin Prikryl
  2 hours ago
  

  
  
  
  

add a comment | 

My user from another server gave his public key to me and asked me to install this public key into my server so he can connect to my server. Did some research and I have to create a directory called .ssh and paste my user public key in a Notepad and save this text file into the .ssh directory. My question is does my research correct if so where and how I create this .ssh directory and the key file, is it in text file format? Do I have to pass any information like my key to the user?

ssh openssh sftp

share|improve this question

edited 2 hours ago

Martin Prikryl

11.3k43379

asked 3 hours ago

xChaaxxChaax

112

New contributor

xChaax is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 2 hours ago

Martin Prikryl

11.3k43379

asked 3 hours ago

xChaaxxChaax

112

New contributor

xChaax is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 2 hours ago

Martin Prikryl

11.3k43379

asked 3 hours ago

xChaaxxChaax

112

New contributor

xChaax is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited 2 hours ago

Martin Prikryl

11.3k43379

edited 2 hours ago

Martin Prikryl

11.3k43379

asked 3 hours ago

xChaaxxChaax

112

New contributor

xChaax is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 3 hours ago

xChaaxxChaax

112

1 Answer
1

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4

• The public key must go into authorized_keys file (not just to some text file) in the .ssh subfolder of user's home directory.


• 
  

  The public key entry must have a correct format like:

  
  
  

  ssh-rsa AAAAB3NzaC1yc2EAAAABJQAAAIEAir2cIHsAFg8QzLF6Yb... some optional comment
  

  
  



• The authorized_keys file must use *nix line endings, what Notepad cannot do (so make sure your SFTP/FTP client uses ASCII transfer mode to converts the line endings)



• The .ssh folder needs to have 700 permissions and the authorized_keys needs to have 600 permissions.

There are zillions of guides on the Internet that cover the above.

For example see my guide to Setting up SSH public key authentication in OpenSSH.

---

• You should provide your user a copy of the server's public host key, so that the user can verify it, when connecting for the first time (it's a separate from the authentication, what the rest of the question is about). Though many users just blindly accept the host key.
  

share|improve this answer

edited 1 min ago

answered 2 hours ago

Martin PrikrylMartin Prikryl

11.3k43379

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Does it matter what directory for .ssh folder ? If does, what directory is home directory? And what is the format for authorized_keys file ?
  
  – xChaax
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  See my updated answer.
  
  – Martin Prikryl
  1 hour ago
  

  
  
  
  

add a comment | 

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4

• The public key must go into authorized_keys file (not just to some text file) in the .ssh subfolder of user's home directory.


• 
  

  The public key entry must have a correct format like:

  
  
  

  ssh-rsa AAAAB3NzaC1yc2EAAAABJQAAAIEAir2cIHsAFg8QzLF6Yb... some optional comment
  

  
  



• The authorized_keys file must use *nix line endings, what Notepad cannot do (so make sure your SFTP/FTP client uses ASCII transfer mode to converts the line endings)



• The .ssh folder needs to have 700 permissions and the authorized_keys needs to have 600 permissions.

There are zillions of guides on the Internet that cover the above.

For example see my guide to Setting up SSH public key authentication in OpenSSH.

---

• You should provide your user a copy of the server's public host key, so that the user can verify it, when connecting for the first time (it's a separate from the authentication, what the rest of the question is about). Though many users just blindly accept the host key.
  

share|improve this answer

edited 1 min ago

answered 2 hours ago

Martin PrikrylMartin Prikryl

11.3k43379

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Does it matter what directory for .ssh folder ? If does, what directory is home directory? And what is the format for authorized_keys file ?
  
  – xChaax
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  See my updated answer.
  
  – Martin Prikryl
  1 hour ago
  

  
  
  
  

add a comment | 

4

• The public key must go into authorized_keys file (not just to some text file) in the .ssh subfolder of user's home directory.


• 
  

  The public key entry must have a correct format like:

  
  
  

  ssh-rsa AAAAB3NzaC1yc2EAAAABJQAAAIEAir2cIHsAFg8QzLF6Yb... some optional comment
  

  
  



• The authorized_keys file must use *nix line endings, what Notepad cannot do (so make sure your SFTP/FTP client uses ASCII transfer mode to converts the line endings)



• The .ssh folder needs to have 700 permissions and the authorized_keys needs to have 600 permissions.

There are zillions of guides on the Internet that cover the above.

For example see my guide to Setting up SSH public key authentication in OpenSSH.

---

• You should provide your user a copy of the server's public host key, so that the user can verify it, when connecting for the first time (it's a separate from the authentication, what the rest of the question is about). Though many users just blindly accept the host key.
  

share|improve this answer

edited 1 min ago

answered 2 hours ago

Martin PrikrylMartin Prikryl

11.3k43379

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Does it matter what directory for .ssh folder ? If does, what directory is home directory? And what is the format for authorized_keys file ?
  
  – xChaax
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  See my updated answer.
  
  – Martin Prikryl
  1 hour ago
  

  
  
  
  

add a comment | 

• The public key must go into authorized_keys file (not just to some text file) in the .ssh subfolder of user's home directory.


• 
  

  The public key entry must have a correct format like:

  
  
  

  ssh-rsa AAAAB3NzaC1yc2EAAAABJQAAAIEAir2cIHsAFg8QzLF6Yb... some optional comment
  

  
  



• The authorized_keys file must use *nix line endings, what Notepad cannot do (so make sure your SFTP/FTP client uses ASCII transfer mode to converts the line endings)



• The .ssh folder needs to have 700 permissions and the authorized_keys needs to have 600 permissions.

There are zillions of guides on the Internet that cover the above.

For example see my guide to Setting up SSH public key authentication in OpenSSH.

---

• You should provide your user a copy of the server's public host key, so that the user can verify it, when connecting for the first time (it's a separate from the authentication, what the rest of the question is about). Though many users just blindly accept the host key.
  

share|improve this answer

edited 1 min ago

answered 2 hours ago

Martin PrikrylMartin Prikryl

11.3k43379

share|improve this answer

edited 1 min ago

answered 2 hours ago

Martin PrikrylMartin Prikryl

11.3k43379

answered 2 hours ago

Martin PrikrylMartin Prikryl

11.3k43379

answered 2 hours ago

Martin PrikrylMartin Prikryl

11.3k43379