Permission denied in SSH to Debian 8.5 using root user although PermitRootLogin is yes

Содержание

Change ownership of the file
Sudo command missing
Insufficient permissions to access the files
Cause of the problem:
Solution

Change ownership of the file

ls -l

sudo chown geeks geeks.txt

Sudo command missing

First, we enter the command

apt-get install neofetch

sudo apt-get install neofetch

Sudo command missing
Insufficient permissions to access the files
Change ownership of the file

Let’s explore all the methods one by one.

Insufficient permissions to access the files

$ cat geeks.txt

The output is

Step 2: Now we will change the access permission using the chmod command. The +rwx adds the read-write access.

$ chmod +rwx geeks.txt
$ cat geeks.txt

r: It means the read permission.
w: It means write permissions
x: It means execution permissions.
+: It provides permission.
–: It removes the permission.

why on ubuntu 14.10 every time that i try to start the postgres on:

sudo -p 'sudo password: ' -u postgres /usr/lib/postgresql/9.4/bin/initdb -D /mnt/postgresql/9.4/data

initdb: invalid locale settings; check LANG and LC_* environment
variables

asked Sep 1, 2015 at 3:52

There are three parts in the output:

initdb: invalid locale settings; check LANG and LC_* environment variables: here initdb fails for real due to missing locale settings.

answered Sep 1, 2015 at 7:59

There is a directory ‘dir1’ owned by root:root. Stat shows:

Access: (0750/drwxr-x---) Uid: ( 0/ root) Gid: ( 0/ root)

and when I log in as root my id shows:

uid=0(root) gid=0(root) groups=0(root)

however when I try to cd into that directory I get:

-bash: cd: dir1/: Permission denied

any ideas why this might be happening and how to remedy it?

Дополнительно: Синий экран смерти. Устранение неполадок 0x000000C5

asked Jun 2, 2015 at 12:57

Maybe it’s SELinux?

Try check with

ls -ladZ dir1

or try to disable SELinux temporary

setenforce 0
# To emable "setenforce 1"

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answered Jun 2, 2015 at 13:15

answered Jun 2, 2015 at 15:00

Toby Speight

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The directory does not have execute permission, which controls listing its content and entering it. First chmod +x and then cd into it.

answered Jun 2, 2015 at 13:39

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Could you run

sudo -s
id

sudo cat /etc/sudoers

The output of id here is quite enlightening. When you ran sudo -s, you were given a UID of 1, while the only UID that the kernel will recognize as having root privileges is UID 0.

getent passwd | grep ':0:'

sudo -s -u username

You should also post the output of

getent passwd root

The bigger issue here is how such a condition came to pass.

Is this machine offering any network services? If so, someone may have broken into it and taken it over. In that case, you should probably back up the data, do a clean re-install, and audit anything that goes back on it.

If it’s more of a personal machine, might there be a knowledgeable prankster who’s had access to it recently?

Edit: your comment to another answer suggests that this is a server. I would highly recommend taking it offline ASAP and imaging its disks for forensic purposes. Unless you can identify a benign cause for this in short order, you’ve probably had your server cracked.

grep PermitRootLogin /etc/ssh/sshd_config
PermitRootLogin yes

How can i solve this problem?

Дополнительно: How To Root Meizu 16X Android Smartphone

Running sudo tail /var/log/auth.log:

Nov 29 07:40:06 mydeb sshd[2530]: User root from ::1 not allowed because none of user's groups are listed in AllowGroups
Nov 29 07:40:06 mydeb sshd[2530]: input_userauth_request: invalid user root [preauth]
Nov 29 07:40:07 mydeb sshd[2530]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=::1 user=root
Nov 29 07:40:09 mydeb sshd[2530]: Failed password for invalid user root from ::1 port 41079 ssh2
Nov 29 07:40:14 mydeb sshd[2530]: Failed password for invalid user root from ::1 port 41079 ssh2
Nov 29 07:40:16 mydeb sshd[2530]: Failed password for invalid user root from ::1 port 41079 ssh2
Nov 29 07:40:16 mydeb sshd[2530]: Connection closed by ::1 [preauth]
Nov 29 07:40:16 mydeb sshd[2530]: PAM 2 more authentication failures; logname= uid=0 euid=0 tty=ssh ruser= rhost=::1 user=root

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asked Nov 28, 2016 at 22:07

Edit /etc/ssh/sshd_config and add root at the of line which is started with AllowGroups. The line should be like this:

AllowGroups sudo sshuser root

service ssh restart

answered Nov 28, 2016 at 22:20

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Permission denied in SSH to Debian 8.5 using root user although PermitRootLogin is yes

Cause of the problem:

Solution

Step 1: Restart your PC. Boot into Ubuntu Recovery Console, and press and hold the SHIFT key while booting. It will take you to the grub loader page as shown in the screenshot below.