Questions tagged [uid]

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How to give user root privs permanently?

Tried: Editing /etc/passwd directly sudo usermod -u 0 -g 0 myname sudo usermod -G root myname I don't want to log in as root or su root because as I want to use fish and from what I read root ...
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29 views

Attempting to get root UID from root EUID

So here is the situation. I have a hypothetical system with 2 users - 'user1' and 'root'. The user 'user1' is just a normal non-sudoer user with uid=1000, and the root, is just a normal root user with ...
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1answer
24 views

Can not execute sudo commands on aws ec2 instance ssh http all ports are off

recently I have been facing a serious issue on one of my servers. While accessing my server with solar putty on windows I got error accessing the server message on the response. So I tried from my ...
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5 views

Maxmium subuid (subordinate user id)

The default SUB_UID_MAX defined in login.defs(5) man page is 600100000. With this limit you can create 9156 users with 65536 subuids each. It is possible to raise this limit - but is there maximum?
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1answer
148 views

Trying to change uid to user, but says it already exists

I'm trying to change the UID of user ec2-user to 500, when I try the following command getting the error UID already exists. sudo usermod -u 500 ec2-user usermod: UID '500' already exists I'm doing a ...
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1answer
58 views

Problem in gaining uid of the system caller in a system call LKM using cred.h

I was trying to get the uid of the process runner which is calling my syscall. I use linux/cred.h and its macro called current_uid() . The problem is that it returns a type which is unknown for me, ...
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1answer
144 views

Allow ssh access for users with certain UID from certain IP's

I need to allow ssh access to all users, but if the UID is between 6000 and 6500 I need to check if the IP where the ssh is coming from is in the file /etc/remote-hosts. /etc/remote-hosts 1.2.3.4 5.6....
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32 views

Start NFS server without UID and GID of Unix directory

I'm trying to set up a NFS Server on Windows to map a folder of a Unix system connected to the same network. The second step in the tutorial How to set up a free NFS server on Windows 10 (sections 4 ...
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2answers
37 views

How can I test that a buildah script is run under buildah-unshare?

If I have a script that uses buildah mount. I use the same way the docs specify, mnt=$(buildah mount $ctr) If I invoke my script sh ./build.sh, I get cannot mount using driver overlay in rootless ...
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31 views

Prevent deb installation from creating new accounts

We are configuring a variety of servers programmatically, and we periodically need to be able to migrate volumes from one server to another. After migrating a volume, we are currently executing chown ...
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2answers
160 views

Switch to other user instead root while using sudo

I would like to redirect (switch) one execution to other user instead root while using sudo. Example: sudo startup.sh will execute the startup.sh as root, but what is needed is for it to be executed ...
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2answers
117 views

an executable emits “pax archive volume change required”

I'm trying to run a ./configure executable for a software (I'm doing it through a remote Linux machine using PuTTY) and at some point it says: ATTENTION! pax archive volume change required. Ready for ...
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86 views

How to update UID/GID in /etc/passwd and /etc/group when using --private-users=pick with systemd containers

sorry for the stupid question as am noob. I have OpenSuseLeap container on my manjaro Linux, I used to login into it and everything was working. I was happy with the command:- sudo systemd-nspawn -b -...
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0answers
178 views

Changing minimum UID to SSH into server

Our Linux HPC server (RHEL 7) only accepts logins to interactive sessions from users with UID >= 1000. However, some of our users have UID lower than that because their usernames were created on a ...
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390 views

Mounting NFS folder from NAS server and mapping uid and gid

I have an Asustor AS1002T v2 NAS server. I want to use NFS to mount a shared folder from the NAS to my local Fedora machine. The shared folder is owned by admin user on the NAS server. The problem is ...
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1answer
163 views

Changing the User UID of a User with No Name

If a user has an UID but no name, ie: $ whoami whoami: cannot find name for user ID 1001 $ id uid=1001 gid=0(root) groups=0(root) is it possible to change the UID but still leave the user name ...
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18 views

Perl resets the EUID only when executing multiple commands through `env - /usr/bin/perl -e 'system(“…”)'`? [duplicate]

I was playing around with setuid perl for command execution (insecure). I learned from another question, that env - /usr/bin/perl -e 'system("...")' doesn't reset the EUID to RUID, like it's the ...
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1k views

Proxmox LXC storage share, permission problems

I'm totally new in these enviroments but I'm trying to learn. I installed proxmox on a single SSD, then attached one HDD(/dev/sdb) to the system for media storage. The basic idea was to create one ...
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1answer
111 views

POSIX compliant way of writing conditional operators [duplicate]

In bash you can do if [ $(echo $UID) != 0 ] then echo "Run as root" exit fi This returns an error message when I run the script with dash or other POSIX-compliant shells. How do you do this ...
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65 views

Solaris 11.4 RBAC works for vim, not for su

I want to access some commands as root, for a normal user. I create the profile profiles -p "privileged" set desc="privileged profile" add cmd=/bin/su set euid=0 end commit exit Then I add profile ...
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1answer
72 views

Why do processes have UID/GID?

What's the point of UID and GID in processes' parameters? There is EUID, RUID, SUID (and for Linux FSUID) that determine process privileges. I can't think what's the use of UID/GID in such scenario. ...
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1answer
284 views

change UID and GID file attributes on read only file system with mount [duplicate]

I have some file image of filesystem, and I want mount it with parameter changing files and directories UID and GID. I cannot change its parameters, because it is read-only filesystem. I found some ...
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2answers
967 views

Questions about the saved user ID

As far as I understood the different user IDs are as follows (from the perspective of a process): real user ID: the user ID that owns the process effective user ID: the user ID which determines what ...
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0answers
220 views

UID/GID mapping for external storage across different POSIX systems [duplicate]

I have access to multiple POSIX desktops where my personal user account has different UID/GID. I use an ext4 formatted portable SSD, which is great for my work, except for the permissioning issues ...
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1answer
3k views

Get users with UID >= 1000 from /etc/passwd

I am trying to get usernames from /etc/passwd if UID equal/greater than 1000 using a for loop. The below simple bash script works but prints the username twice for some reason. #!/bin/bash for ...
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817 views

Specify UID/GID for NFS mount (CentOS 7)

I have two servers svrA and svrB (both CentOS 7), where svrA is a turn-key system so I cannot change anything on it, and svrB is the one I am working on. svrA contains log files I need to transfer to ...
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1answer
53 views

Predictable UIDs of users created in the process of portage package installation

Adding users is specified in portage ebuild files using the enewuser function. Some ebuilds call this function with a specific UID (second argument), others either don't provide the argument or ...
3
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1answer
318 views

When did user accounts using UIDs above 1000 become normal? And why?

We have a really old NIS domain which is mapping some user accounts to UIDs less than 1000. I'm wondering when did using UIDs greater than or equal to 1000 for human users become 'standard', why did ...
2
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1answer
117 views

ID inheritance – Which IDs?

I'm learning UNIX file permissions / ID inheritance and would like to clarify something: I have this list of permissions, users, groups and files: -rwxr-xr-x userA A foo -rw-rwsr-x userB B bar ...
3
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1answer
106 views

How essential are usernames ( compared to uids )?

Background: I recently read about a freedesktop.org-bug which allowed executing any systemctl command for uid > INT_MAX. Thus I ran: root@host$> useradd -u 4000000000 largeuiduser root@host$&...
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68 views

Is there a recommended way to access files owned by a non-user UID?

Suppose a multiboot computer on which two GNU/Linux distributions are installed, each with its own user(s). Say those users don't share the same UID over the two systems. Now one needs to access the ...
5
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1answer
13k views

Assignment of UID and GID from Active Directory

My CentOS 7 machine has successfully joined a domain FOOBAR (as verified by realm list) and here's the information about an user coming from the AD (non-local): [root@centos7 ~]# id jdoe@FOOBAR....
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1answer
1k views

Mapping user to filesystem user when UID's mismatch?

Say I have a user named user with UID 1001 on one system and the same user (named user) with another UID, let's say 1002. If I unplug the disk drive from the second system and plug it into the first, ...
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1answer
296 views

How to create multiple IDs with same UID in AIX ? How to change UID of IDs in AIX?

How to create multiple IDs with same UID in AIX ? How to change UID of IDs in AIX ?
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1answer
1k views

First process in a new Linux user namespace needs to call setuid()?

I'm learning about Linux user namespaces and I'm observing a strange behavior which isn't completely clear to me. I've created a range of UIDs in initial user namespaces to which I can map UIDs in ...
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3answers
201 views

Shell script example to stop execution of all processes with a certain UID? [duplicate]

I can't seem to find any examples on the internet for this particular task.
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1answer
206 views

How does sudo achieve changing the privileges of a process?

From man sudo When sudo executes a command, the security policy specifies the execution environment for the command. Typically, the real and effective user and group and IDs are set to match ...
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930 views

What is the usage of set-user-ID of a program file?

From APUE When we execute a program file, the effective user ID of the process is usually the real user ID. However, we can also set the set-user-ID bit in the file’s mode word (st_mode) that ...
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1answer
1k views

With set-user-ID bit on, are both the process's EUID and saved set-user-ID changed to the file's user ID?

From APUE The saved set-user-ID is copied from the effective user ID by exec functions. If the file’s set-user-ID bit is set, this copy is saved after exec stores the effective user ID from the file’...
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2answers
469 views

systemd DynamicUser= services v.s. journald splits

systemd-journald has the default config SplitMode=uid, to create individual journal (log) files for each user, which they are allowed to read. When running services with DynamicUser=, does this mean ...
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1answer
72 views

uidgid file - UID in parentheses

Looking at file /usr/share/doc/setup-*/uidgid on RHEL7, I can see some lines containing -, ? or number in parentheses: ... nslcd 65 (55) / /sbin/nologin nslcd wine - 66 - - ...
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1answer
511 views

Can I have two users with the same name but different UID's?

I have a server that I use for playing around with. I want to set up an email account that is @.com, but the way that SquirrelMail and the mail server is set up, the home folder for the username has ...
0
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1answer
386 views

Where to obtain the uidgid file

I was reading /etc/bashrc and saw the following: # By default, we want umask to get set. This sets it for non-login shell. # Current threshold for system reserved uid/gids is 200 # You could check ...
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1answer
2k views

sed to change userid in /etc/passwd to zero

I am trying to change user monitor uid in /etc/passwd , but below gives me an error: sed -s /etc/passwd <<-"EOF" /^\(monitor:[^:]*:\)[0-9]*:[0-9]*:/s//\10:0:/ w q EOF
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3answers
5k views

Can bash run with uid 0 and different euid?

I was writing some bash code and I wanted to check if the script had root privileges. All of the code I see from other people only checks for $EUID == 0. It is perfectly possible to have other ...
2
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1answer
349 views

Mounted SMB shares: permission troubles with UID mismatch between client and server [closed]

On the Linux machine LinuxClient I'm trying to mount an SMB share backups located on the Unix machine Server. I want to provide separate directories within backups for different purposes, and I want ...
1
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1answer
782 views

Small office server and UID translation

I want to set up a small server for the office such that users can store their own files which also has separate directories set up for groups to share files. I also have users and clients who would ...
3
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1answer
1k views

Reserving a range of anonymous UIDs; /etc/subuid

I need a range of uids (say a few thousand) for a setuid-root tool to use. Is there a protocol to registering such a range or do I just pick a range and hope no other program will use those uids? (I'...
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2answers
317 views

How to set UIDs and GIDs during install of Debian?

During installation of Debian the default initial UID is 1000 and GID is 1000. When creating a user account during install, is there a way to specify their specific values, for example 3197?
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1answer
2k views

Directory owner is a number instead of a name in Centos. Why is that?

I am using Centos and I did ll command for one of the directory. Owners of the files within the directory are some numbers instead of username. Can you please explain why is that ? If you see below ...