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There are many ways but this is simplest. Su vs sudo password#use rsync over SSH etc.įinal note is if you want to generate the password file shadow encrypted string in an automated shell etc try this link for more. If FTP is not as secure maybe don't use it anyway. Only thing different from way back is you can't SSH directly to root. MasterJames Lesson of the day and every day for many things is: old school was always better, changing perfection is normal but it doesn't make it right. Yes you can still su from the ssh login user after removal from the group. Actually to this point it may still be untrue since man crypt shows 'By taking the lowest 7 bits of each of the first eight characters of the key, a 56-bit key is obtained.' may still only use the first 8 chars anyway, my tests say otherwise so maybe that's another good question about password lengths. If you also double up the length of the passwords (for both accounts) other then an obvious guessable plain doubling so say 16 characters then it's pretty secure. (obviously you would preferable not need to prefix with sudo since you su'ed to root). This is probably the cleanest safest feeling way to do it meaning remove a user from the group sudo. Su vs sudo full#You will see this difference in the prompt path not having changed to the tilde (aka user's home directory) vs full /home/user path of the user that just su'ed so probably less desirable then sudo su or sudo -s anyway.Īctually root still cant use SSH to login directly by default anyway so it is added security if you eventually disable the original login account from sudoers. It is added security to have a different user that has access then the hacker has to guess the username as well as a password, but you can add back root, and disable the sudoers for the still unknown account, which would be more secure with double passwords and an unknown username.Īnd to disable or lock root again passwd -l root Su vs sudo install#Su command doesn’t clean env vars, it just changes a user to root and keeps env vars for old user.Even though it appears sa for system administrator is no longer included in the ubuntu variant by default (apt install acct), so I guess I mean logically.Īctually I guess I am showing my age with 'sa' but never used it because at the time 'su' was a more direct approach.ĭoing 'su' directly is not possible as you need the root password but the account is disabled by default. It means that all env vars were cleaned and ‘clean’ root session was executed. In case of su - command, the first thing that runs is changing the user and only then the shell runs. In the case of su and su - we also have significant differences. That’s why I started to use the sudo -i command instead of sudo -s. Here we see that we are also importing env vars and changing directory. Su vs sudo manual#The Command environment section in the sudoers(5) manual documents how the -i option affects the environment in which a command is run when the sudoers policy is in use. The command is run with an environment similar to the one a user would receive at log in. sudo attempts to change to that user’s home directory before running the shell. If no command is specified, an interactive shell is executed. If a command is specified, it is passed to the shell for execution via the shell’s -c option. This means that login-specific resource files such as. i, - login Run the shell specified by the target user’s password database entry as a login shell. login) wouldn’t be imported.īut we have another situation with sudo -i command: It means that we run shell by root without changing a directory, also env vars (that could be set in. s, - shell Run the shell specified by the SHELL environment variable if it is set or the shell specified by the invoking user’s password database entry. |
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