SSH without password - Revision history

Dirkjan at 14:01, 22 January 2023

2023-01-22T14:01:59Z

Dirkjan at 14:01, 22 January 2023

2023-01-22T14:01:37Z

Dirkjan at 14:01, 22 January 2023

2023-01-22T14:01:19Z

Dirkjan at 14:00, 22 January 2023

2023-01-22T14:00:50Z

Dirkjan at 14:00, 22 January 2023

2023-01-22T14:00:31Z

Dirkjan at 19:44, 27 August 2020

2020-08-27T19:44:01Z

Dirkjan: Replaced content with "SSH without password Category:log"

2020-08-27T19:06:45Z

Replaced content with "SSH without password Category:log"

Dirkjan: Created page with "Your aim You want to use Linux and OpenSSH to automize your tasks. Therefore you need an automatic login from host A / user a to Host B / user b. You don't want to enter any..."

2020-08-25T07:47:44Z

Created page with "Your aim You want to use Linux and OpenSSH to automize your tasks. Therefore you need an automatic login from host A / user a to Host B / user b. You don't want to enter any..."

New page

Your aim

You want to use Linux and OpenSSH to automize your tasks. Therefore you need an automatic login from host A / user a to Host B / user b. You don't want to enter any passwords, because you want to call ssh from a within a shell script.
How to do it

First log in on A as user a and generate a pair of authentication keys. Do not enter a passphrase:

{{{
a@A:~> ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/a/.ssh/id_rsa):
Created directory '/home/a/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/a/.ssh/id_rsa.
Your public key has been saved in /home/a/.ssh/id_rsa.pub.
The key fingerprint is:
3e:4f:05:79:3a:9f:96:7c:3b:ad:e9:58:37:bc:37:e4 a@A
}}}

Now use ssh to create a directory ~/.ssh as user b on B. (The directory may already exist, which is fine):
{{{
a@A:~> ssh b@B mkdir -p .ssh
b@B's password:
}}}
Finally append a's new public key to b@B:.ssh/authorized_keys and enter b's password one last time:

{{{
a@A:~> cat .ssh/id_rsa.pub | ssh b@B 'cat >> .ssh/authorized_keys'
b@B's password:
}}}

From now on you can log into B as b from A as a without password:
[[Category:log]]

← Older revision		Revision as of 19:06, 27 August 2020
Line 1:		Line 1:
−	~~Your aim~~	+	SSH without password
−
−	You want to use Linux and OpenSSH to automize your tasks. Therefore you need an automatic login from host A / user a to Host B / user b. You don't want to enter any passwords, because you want to call ssh from a within a shell script.
−	~~How to do it~~
−
−	~~First log in on A as user a and generate a pair of authentication keys. Do not enter a passphrase:~~
−
−	~~{{{~~
−	~~a@A:~> ssh-keygen -t rsa~~
−	~~Generating public/private rsa key pair.~~
−	~~Enter file in which to save the key (/home/a/.ssh/id_rsa):~~
−	~~Created directory '/home/a/.ssh'.~~
−	~~Enter passphrase (empty for no passphrase):~~
−	~~Enter same passphrase again:~~
−	~~Your identification has been saved in /home/a/.ssh/id_rsa.~~
−	~~Your public key has been saved in /home/a/.ssh/id_rsa.pub.~~
−	~~The key fingerprint is:~~
−	~~3e:4f:05:79:3a:9f:96:7c:3b:ad:e9:58:37:bc:37:e4 a@A~~
−	~~}}}~~
−
−	~~Now use ssh to create a directory ~/.ssh as user b on B. (The directory may already exist, which is fine):~~
−	~~{{{~~
−	~~a@A:~> ssh b@B mkdir -p .ssh~~
−	~~b@B's password:~~
−	~~}}}~~
−	~~Finally append a's new public key to b@B:.ssh/authorized_keys and enter b's password one last time:~~
−
−	~~{{{~~
−	~~a@A:~> cat .ssh/id_rsa.pub \| ssh b@B 'cat >> .ssh/authorized_keys'~~
−	~~b@B's password:~~
−	~~}}}~~
−
−	~~From now on you can log into B as b from A as a~~ without password:
	[[Category:log]]		[[Category:log]]

@@ Line 6: / Line 6: @@
 First log in on A as user a and generate a pair of authentication keys. Do not enter a passphrase:
-a@A:~> ssh-keygen -t rsa
+  a@A:~> ssh-keygen -t rsa
-Generating public/private rsa key pair.
+  Generating public/private rsa key pair.
-Enter file in which to save the key (/home/a/.ssh/id_rsa):
+  Enter file in which to save the key (/home/a/.ssh/id_rsa):
-Created directory '/home/a/.ssh'.
+  Created directory '/home/a/.ssh'.
-Enter passphrase (empty for no passphrase):
+  Enter passphrase (empty for no passphrase):
-Enter same passphrase again:
+  Enter same passphrase again:
-Your identification has been saved in /home/a/.ssh/id_rsa.
+  Your identification has been saved in /home/a/.ssh/id_rsa.
-Your public key has been saved in /home/a/.ssh/id_rsa.pub.
+  Yo ur public key has been saved in /home/a/.ssh/id_rsa.pub.
-The key fingerprint is:
+  The key fingerprint is:
 e:4f:05:79:3a:9f:96:7c:3b:ad:e9:58:37:bc:37:e4 a@A
 Now use ssh to create a directory ~/.ssh as user b on B. (The directory may already exist, which is fine):
-a@A:~> ssh b@B mkdir -p .ssh
+  a@A:~> ssh b@B mkdir -p .ssh
-b@B's password:
+  b@B's password:
 Finally append a's new public key to b@B:.ssh/authorized_keys and enter b's password one last time:

@@ Line 30: / Line 30: @@
 b@B's password:
 }}}
 From now on you can log into B as b from A as a without password:
 [[Category:log]]

← Older revision		Revision as of 19:44, 27 August 2020
Line 1:		Line 1:
−	~~SSH~~ without password	+	Your aim
		+
		+	You want to use Linux and OpenSSH to automize your tasks. Therefore you need an automatic login from host A / user a to Host B / user b. You don't want to enter any passwords, because you want to call ssh from a within a shell script.
		+	How to do it
		+
		+	First log in on A as user a and generate a pair of authentication keys. Do not enter a passphrase:
		+
		+	{{{
		+	a@A:~> ssh-keygen -t rsa
		+	Generating public/private rsa key pair.
		+	Enter file in which to save the key (/home/a/.ssh/id_rsa):
		+	Created directory '/home/a/.ssh'.
		+	Enter passphrase (empty for no passphrase):
		+	Enter same passphrase again:
		+	Your identification has been saved in /home/a/.ssh/id_rsa.
		+	Your public key has been saved in /home/a/.ssh/id_rsa.pub.
		+	The key fingerprint is:
		+	3e:4f:05:79:3a:9f:96:7c:3b:ad:e9:58:37:bc:37:e4 a@A
		+	}}}
		+
		+	Now use ssh to create a directory ~/.ssh as user b on B. (The directory may already exist, which is fine):
		+	{{{
		+	a@A:~> ssh b@B mkdir -p .ssh
		+	b@B's password:
		+	}}}
		+	Finally append a's new public key to b@B:.ssh/authorized_keys and enter b's password one last time:
		+
		+	{{{
		+	a@A:~> cat .ssh/id_rsa.pub \| ssh b@B 'cat >> .ssh/authorized_keys'
		+	b@B's password:
		+	}}}
		+
		+	From now on you can log into B as b from A as a without password:
	[[Category:log]]		[[Category:log]]