Sudo command is not asking password from stdin. And Failing

Question

Whenever I am running any command with sudo, No password is asked from stdin. Instead, it automatically takes a password from somewhere and fails. Once All attempts are exhausted, my command is ultimately failed. I am not able to open the sudoers file too.

I also tried echo PASSWORD | sudo ls. Here too it is taking the wrong password.

ank@ank-aqua-pc:server$type -a sudo
sudo is /usr/bin/sudo

ank@ank-aqua-pc:server$sudo -l
Sorry, try again.
Sorry, try again.
sudo: 3 incorrect password attempts

Please don't post pictures of text. Copy the text here and use code formatting instead. Add the output of type -a sudo and sudo -l to the question too. — muru, Mar 14 '21 at 09:32
A temporary workaround may be pkexec, I haven't found any solution so this command is temporary. — Mandi, Mar 14 '21 at 09:33
Does your user have an empty password? see for example sudo for users with empty passwords — steeldriver, Mar 14 '21 at 14:11

score 1 · Answer 1 · answered Mar 14 '21 at 10:19

1

The man sudo is saying (Source)

-S, --stdin Write the prompt to the standard error and read the password from the standard input instead of using the terminal device. The password must be followed by a newline character.

and you need to specify the user that this password is used for

The correct command is

PASSWORD="abc\n" #The \n is for newline character
echo $PASSWORD | sudo -S -u <username> <command

answered Mar 14 '21 at 10:19

Nicolas Formichella

612

ank@ank-aqua-pc:aquasec$echo $PASSWD | sudo -S -u ank ls
sudo: pam_open_session: Module is unknown sudo: policy plugin failed session initialization This replied with error pam_open_session.: Module unknown. Looks like some one was stuck with same issue but did not get fix. https://askubuntu.com/questions/1291697/pam-open-session-module-is-unknown
– Ankush K Mar 14 '21 at 10:37

Sudo command is not asking password from stdin. And Failing

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