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¿Cómo permitir el acceso SSH sin solicitar password?

Esto es útil para generar scripts que utilizen el protocolo SSH en modo autoático, es decir, que sean no interactivo.

Los pasos son los siguientes:

user_A@maq_remota $ ssh-keygen -t dsa
# (sin passphrase)

user_B@maq_local $ ssh maq_remota -l user_A "cat .ssh/id_dsa.pub" >> ~/.ssh/authorized_keys2

Ahora se puede conectar desde:
user_A@maq_remota a user_B@maq_local
sin usar password utilizando el protocolo SSH 2.


Existe tambien otro escenario real

[dvarela@localhost]$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/dvarela/.ssh/id_rsa):
Created directory '/home/dvarela/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/dvarela/.ssh/id_rsa.
Your public key has been saved in /home/dvarela/.ssh/id_rsa.pub.
The key fingerprint is:
2a:b6:84:6b:b8:80:ef:e9:6a:d0:13:7d:7b:97:b7:3d dvarela@localhost.localdomain
[dvarela@localhost]$ cd .ssh/
[dvarela@localhost .ssh]$ ls
id_rsa  id_rsa.pub

[dvarela@localhost .ssh]$
[dvarela@localhost .ssh]$ scp id_rsa.pub dvarela@fenix:/home/dvarela/.ssh
dvarela@fenix's password:
id_rsa.pub                                                 100%  414     0.4KB/s   00:00

[dvarela@localhost .ssh]$ ssh fenix
dvarela@fenix's password:
Last login: Tue Apr 29 10:01:44 2008 from localhost.localdomain
[dvarela@fenix .ssh]$
[dvarela@fenix ~]$ cd .ssh/
[dvarela@fenix .ssh]$ ls id_rsa.pub  known_hosts
[dvarela@fenix .ssh]$

[dvarela@fenix .ssh]$ mv id_rsa.pub authorized_keys2
[dvarela@fenix .ssh]$ chmod 0600 authorized_keys2
[dvarela@fenix .ssh]$ ls -la
total 20
drwx------ 2 dvarela dvarela 4096 Apr 29 10:26 .
drwx------ 7 dvarela dvarela 4096 Apr 28 23:41 ..
-rw------- 1 dvarela dvarela  414 Apr 29 10:25 authorized_keys2
-rw-r--r-- 1 dvarela dvarela  643 Apr 25 20:27 known_hosts
[dvarela@fenix .ssh]$ logout
Connection to listas closed.
[dvarela@localhost ~]$
[dvarela@localhost ~]$
[dvarela@localhost ~]$
[dvarela@localhost ~]$ ssh fenix
Last login: Tue Apr 29 10:27:28 2008 from localhost.localdomain
[dvarela@fenix ~]$
[dvarela@fenix ~]$
pwd
/home/dvarela
[dvarela@fenix ~]$



 

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