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Dropbear: Difference between revisions
→Setting keys to get ssh connectivity without password requests
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To enable this mode, add "-s" option at the start server command, it can be added in the devdir fs script or in the target fs directly. | To enable this mode, add "-s" option at the start server command, it can be added in the devdir fs script or in the target fs directly. | ||
To add this option in the devdir, open the file <DEVDIR>/fs/apps/dropbear.x.y/dropbear and add the option "-s" in the flag DROPBEAR_EXTRA_ARGS | |||
DROPBEAR_EXTRA_ARGS=-s | DROPBEAR_EXTRA_ARGS=-s | ||
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/etc/init.d/dropbear start | /etc/init.d/dropbear start | ||
The first time that | The first time that this script run, the scrip print in the log, messages about generation of public and private keys, you can take the public key to add it in host computer, if Dropbear was started at this point, you can get the public key manually, this process must be explained in the following section. | ||
To add this option in the target fs directly, repeat the same action in the script /etc/init.d/dropbear. After that, restart the application | |||
/etc/init.d/dropbear restart | /etc/init.d/dropbear restart | ||
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===How to get Dropbear public and private keys in target manually=== | ===How to get Dropbear public and private keys in target manually=== | ||
The "dropbearkey" tool creates public and private keys or show the public key. | |||
To create an pair of keys, run the following command: | To create an pair of keys, run the following command: | ||
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$ dropbearkey -t rsa -f /etc/dropbear/dropbear_rsa_host_key | $ dropbearkey -t rsa -f /etc/dropbear/dropbear_rsa_host_key | ||
The last command saves in ''/etc/dropbear/dropbear_rsa_host_key'' the private key, and prints the public key. | The last command saves in ''/etc/dropbear/dropbear_rsa_host_key'' the private key, and prints the public key. To show only the public key in the required format, run the commmand: | ||
$ dropbearkey -y -f /etc/dropbear/dropbear_rsa_host_key | grep ssh-rsa | $ dropbearkey -y -f /etc/dropbear/dropbear_rsa_host_key | grep ssh-rsa | ||
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===How to set Dropbear public key in host=== | ===How to set Dropbear public key in host=== | ||
When | When the public key was generated by Dropbear in the target, it must be added in the correctly host file location. | ||
The public key must added in the file | The public key must added in the file | ||
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===How to get OpenSSH public and private keys in host computer=== | ===How to get OpenSSH public and private keys in host computer=== | ||
The following command, creates two files in ''~/.ssh/'', one is named id_rsa and is the private key (It mustn't be touched) and other that is named id_rsa.pub, this file contain the public key, this content must be added in target location explained in the next section. | |||
ssh-keygen -b 4096 -t rsa | ssh-keygen -b 4096 -t rsa | ||