Showing posts with label SSH. Show all posts
Showing posts with label SSH. Show all posts

Debian/Ubuntu system enables root remote login

 

Debian first connects to SSH with a common account and switches root login

are -

Ubuntu uses

sudo -i

Install basic software to execute code

apt install sudo vim curl wget -y
cat >> /etc/ssh/sshd_config << EOFPermitRootLogin yesPasswordAuthentication yesEOFsystemctl restart sshd

Oracle crack SSH key problem

 This post will teach you the second method to solve the SSH key problem.

Step 1: Prepare a linux server directly, (any one, this is not difficult for MJJ)
Step 2: Link your own linux server (under root authority), enter the cd/root/ .ssh directory
Step 3 : Execute the ssh -keygen -t rsa command (enter all the way)
Picture [1] - Oracle crack SSH key problem - Rich Magazine
Step 4: Get the key generated just now, execute the command cat id_rsa.pub (if you follow my way to enter)
Picture [2] - Oracle crack SSH key problem - Rich Magazine
Step 5: Go to oralce A workbench is added to the instance details page, and the key is only generated after entering it.
Picture [3] - Oracle crack SSH key problem - Rich Magazine
Once the console connection is active, click "Connect using SSH" and copy the command to linux for execution.
Step 6: Successfully connect to the instance.
Picture [4] - Oracle crack SSH key problem - Rich Magazine
Step 7: Restart the instance.
Picture [5] - Oracle crack SSH key problem - Rich Magazine
Step 8: After rebooting we go back to the linux server and we will see the following echo, select the kernel and click "E" to edit the kernel to run with a bash prompt.
Picture [6] - Oracle crack SSH key problem - Rich Magazine
Step 9: Edit the kernel with rw init=/bin/bash and press ctrl+x, it will land at the bash prompt. As shown below (there is a space before rw)
Picture [7] - Oracle crack SSH key problem - Rich Magazine
Picture [8] - Oracle crack SSH key problem - Rich Magazine
Step 10: Execute the following command and update the new public key generated by PUTTYGEN to authorized_keys
Command 1: /usr/sbin/load_policy -i
Command 2: /bin/mount -o remount, rw/
command 3: cd ~opc/.ssh
command 4: pwd
Picture [9] - Oracle crack SSH key problem - Rich Magazine
Step 11: Copy the new key to the authorized_keys file and save it.
Use the command: vi authorized_keys
Step 12: Change the ownership and permissions of the authorized_keys file and reboot the system.
Picture [10]-Oracle cracking SSH key problem-Rich Magazine
After waiting for the instance to bootstrap, you can use the new private key to connect to the instance.