[BUG] Problem with system group

[antwal]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

When I specify a username that matches a system group name, usermod fails with an error

Expected Behavior

An error should be raised and the container should exit

Steps To Reproduce

Set USERNAME is "www-data", the same name is an existing group in the system

Environment

- OS: Debian 12
- How docker service was installed: apt

CPU architecture

x86-64

Docker creation

version: "3.9"
services:
  wordpress:
    networks:
      - blackhole
    hostname: openssh-server
    container_name: openssh-server
    restart: unless-stopped
    image: lscr.io/linuxserver/openssh-server:latest
    ports:
      - "2222:2222"
    environment:
      - PUID=33
      - PGID=33
      - TZ=Europe/Rome
      - USER_NAME=www-data # Problem with system group
    volumes:
      - /mnt/storage/openssh-server/config:/config
      - /mnt/storage/www-data/:/www-data/

networks:
  blackhole:
    name: container-net
    external: true

Container logs

[migrations] started
[migrations] no migrations found
groupmod: group 'www-data' already exists
───────────────────────────────────────
      ██╗     ███████╗██╗ ██████╗
      ██║     ██╔════╝██║██╔═══██╗
      ██║     ███████╗██║██║   ██║
      ██║     ╚════██║██║██║   ██║
      ███████╗███████║██║╚██████╔╝
      ╚══════╝╚══════╝╚═╝ ╚═════╝
   Brought to you by linuxserver.io
───────────────────────────────────────
To support LSIO projects visit:
https://www.linuxserver.io/donate/
───────────────────────────────────────
GID/UID
───────────────────────────────────────
User UID:    33
User GID:    1001
───────────────────────────────────────
Linuxserver.io version: 9.7_p1-r4-ls179
Build-date: 2024-12-01T18:53:35+00:00
───────────────────────────────────────
    
User name is set to www-data
sudo is disabled.
SSH host public key(s):
ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBNgS4rePrIpw+uygy69sltdCQdXTzDtVujxBWA+wk/JY9lYmlDzu1KiV/GW1VFA5wC4AJTprxdJmnOAwDSaBamo= root@openssh-server
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAueSTsWJbt0ku3byZZ8iKqWhMpvVSfy14m7jDP0zJN6 root@openssh-server
ssh-rsa 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 root@openssh-server
sshd is listening on port 2222
User/password ssh access is disabled.
[custom-init] No custom files found, skipping...

[github-actions]

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[antwal]

Changing PUID and PGID the server starts despite the existing group error; but it does not accept any of the generated keys always giving the permissions denied error:

docker compose:

version: "3.9"
services:
  wordpress:
    networks:
      - blackhole
    hostname: openssh-server
    container_name: openssh-server
    restart: unless-stopped
    image: lscr.io/linuxserver/openssh-server:latest
    ports:
      - "2222:2222"
    environment:
      - PUID=1001
      - PGID=1001
      - TZ=Europe/Rome
      - USER_NAME=www-data
    volumes:
      - /mnt/storage/openssh-server/config:/config
      - /mnt/storage/www-data/:/www-data/

networks:
  blackhole:
    name: container-net
    external: true

container log:

[migrations] started
[migrations] no migrations found
groupmod: group 'www-data' already exists
───────────────────────────────────────
      ██╗     ███████╗██╗ ██████╗
      ██║     ██╔════╝██║██╔═══██╗
      ██║     ███████╗██║██║   ██║
      ██║     ╚════██║██║██║   ██║
      ███████╗███████║██║╚██████╔╝
      ╚══════╝╚══════╝╚═╝ ╚═════╝
   Brought to you by linuxserver.io
───────────────────────────────────────
To support LSIO projects visit:
https://www.linuxserver.io/donate/
───────────────────────────────────────
GID/UID
───────────────────────────────────────
User UID:    1001
User GID:    1001
───────────────────────────────────────
Linuxserver.io version: 9.7_p1-r4-ls179
Build-date: 2024-12-01T18:53:35+00:00
───────────────────────────────────────
    
User name is set to www-data
sudo is disabled.
ssh-keygen: generating new host keys: RSA ECDSA ED25519 
SSH host public key(s):
ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBKreHpyBCdsHe3Iypd5aYqK3MWb6E1sWpdNSM1fvcuT2IsM6GO0zTdeOrkhx5Wt5tqrNu+H3Cwd5qAfhbW+6wZQ= root@ssh-test
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBK+iE7H271ewnJ8x2UqdBTrSSiw8f5WCzKie7EpOsUT root@ssh-test
ssh-rsa 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 root@ssh-test
sshd is listening on port 2222
User/password ssh access is disabled.
[custom-init] No custom files found, skipping...
[ls.io-init] done.

/etc/passwd:

root:x:0:0:root:/root:/bin/sh
bin:x:1:1:bin:/bin:/sbin/nologin
daemon:x:2:2:daemon:/sbin:/sbin/nologin
lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin
sync:x:5:0:sync:/sbin:/bin/sync
shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
halt:x:7:0:halt:/sbin:/sbin/halt
mail:x:8:12:mail:/var/mail:/sbin/nologin
news:x:9:13:news:/usr/lib/news:/sbin/nologin
uucp:x:10:14:uucp:/var/spool/uucppublic:/sbin/nologin
cron:x:16:16:cron:/var/spool/cron:/sbin/nologin
ftp:x:21:21::/var/lib/ftp:/sbin/nologin
sshd:x:22:22:sshd:/dev/null:/sbin/nologin
games:x:35:35:games:/usr/games:/sbin/nologin
ntp:x:123:123:NTP:/var/empty:/sbin/nologin
guest:x:405:1000:guest:/dev/null:/sbin/nologin
nobody:x:65534:65534:nobody:/:/sbin/nologin
klogd:x:100:101:klogd:/dev/null:/sbin/nologin
www-data:x:1001:1001::/config:/bin/bash

/etc/group:

root:x:0:root
bin:x:1:root,bin,daemon
daemon:x:2:root,bin,daemon
sys:x:3:root,bin
adm:x:4:root,daemon
tty:x:5:
disk:x:6:root
lp:x:7:lp
kmem:x:9:
wheel:x:10:root
floppy:x:11:root
mail:x:12:mail
news:x:13:news
uucp:x:14:uucp
cron:x:16:cron
audio:x:18:
cdrom:x:19:
dialout:x:20:root
ftp:x:21:
sshd:x:22:
input:x:23:
tape:x:26:root
video:x:27:root
netdev:x:28:
kvm:x:34:kvm
games:x:35:
shadow:x:42:
www-data:x:1001:
users:x:1000:games,www-data
ntp:x:123:
abuild:x:300:
utmp:x:406:
ping:x:999:
nogroup:x:65533:
nobody:x:65534:
klogd:x:101:klogd
abc:!:1001:

[antwal]

the current solution to the problem is to use a different username with access via password and everything works normally

docker compose:

version: "3.9"
services:
  wordpress:
    networks:
      - blackhole
    hostname: openssh-server
    container_name: openssh-server
    restart: unless-stopped
    image: lscr.io/linuxserver/openssh-server:latest
    ports:
      - "2222:2222"
    environment:
      - PUID=33
      - PGID=33
      - TZ=Europe/Rome
      - USER_NAME=www-user
      - PASSWORD_ACCESS=true
      - USER_PASSWORD=password
    volumes:
      - /mnt/storage/openssh-server/config:/config
      - /mnt/storage/www-data/:/www-data/

networks:
  blackhole:
    name: container-net
    external: true

container log:

[migrations] started
[migrations] no migrations found
───────────────────────────────────────
      ██╗     ███████╗██╗ ██████╗
      ██║     ██╔════╝██║██╔═══██╗
      ██║     ███████╗██║██║   ██║
      ██║     ╚════██║██║██║   ██║
      ███████╗███████║██║╚██████╔╝
      ╚══════╝╚══════╝╚═╝ ╚═════╝
   Brought to you by linuxserver.io
───────────────────────────────────────
To support LSIO projects visit:
https://www.linuxserver.io/donate/
───────────────────────────────────────
GID/UID
───────────────────────────────────────
User UID:    33
User GID:    33
───────────────────────────────────────
Linuxserver.io version: 9.7_p1-r4-ls179
Build-date: 2024-12-01T18:53:35+00:00
───────────────────────────────────────
    
User name is set to www-user
sudo is disabled.
ssh-keygen: generating new host keys: RSA ECDSA ED25519 
SSH host public key(s):
ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBCna9vfeBcn9qTBrHqyZ1rFKOb+CS3IaBYSc9VrzSzw+3r4MzDgDbOLjRXgWs6iIkzJI1R9hRtqbFY531FdACxc= root@ssh-test
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICUn9Nb9McTwfo8LdOgCSniSNtyItKmSKq49cuj8V3hH root@ssh-test
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQDDhH+1eoPkaqW18JVxWzgHCRTphywP0jHt4TuYYIgYyCzNP8XcoPu6oZWvcYQGvOHalnJcJQEvgHQvo8nNN+J/LfgtKNi3onhABf5ba7IEuCYNBCFby8ODopRvB5CUyUzwdg/5LGp3XwYxgmtfsqp90vpJdbK1Ko5lbuWuU2P3WltyZUHV6CqTNCNlSkQgxS88XbftWu6dwYXHX3d1EWNld4YbveZ1wWrcJc1VBpkpAPDzcFFNwXgDLky7ZLF/8IH0V+C007C95lvpfuATW1nT+BNb7X3WEasHjshR44nYt4BEhdEwyHb7aDJdqBpKqQg9K/uDKkJ7JE1YtGDaAE1sUzyjHJVvgeeGxT7joEhFFeoGdFC0adgKh7LH5jM5qZ11beO4mFYaG4hfv/UYVPaee/gQ/T/XyKRRZsI3cZR29aR2C9wVf7AOFfHgn6OqkxprkjlrOTOTs9+gyVOeMB+DaUEL5znBvFPtho6rglkOrvtolRMzDWsqHzHQir/OLw0= root@ssh-test
sshd is listening on port 2222
User/password ssh access is enabled.
[custom-init] No custom files found, skipping...
[ls.io-init] done.

/etc/passwd:

root:x:0:0:root:/root:/bin/sh
bin:x:1:1:bin:/bin:/sbin/nologin
daemon:x:2:2:daemon:/sbin:/sbin/nologin
lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin
sync:x:5:0:sync:/sbin:/bin/sync
shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
halt:x:7:0:halt:/sbin:/sbin/halt
mail:x:8:12:mail:/var/mail:/sbin/nologin
news:x:9:13:news:/usr/lib/news:/sbin/nologin
uucp:x:10:14:uucp:/var/spool/uucppublic:/sbin/nologin
cron:x:16:16:cron:/var/spool/cron:/sbin/nologin
ftp:x:21:21::/var/lib/ftp:/sbin/nologin
sshd:x:22:22:sshd:/dev/null:/sbin/nologin
games:x:35:35:games:/usr/games:/sbin/nologin
ntp:x:123:123:NTP:/var/empty:/sbin/nologin
guest:x:405:1000:guest:/dev/null:/sbin/nologin
nobody:x:65534:65534:nobody:/:/sbin/nologin
klogd:x:100:101:klogd:/dev/null:/sbin/nologin
www-user:x:33:33::/config:/bin/bash

/etc/group:

root:x:0:root
bin:x:1:root,bin,daemon
daemon:x:2:root,bin,daemon
sys:x:3:root,bin
adm:x:4:root,daemon
tty:x:5:
disk:x:6:root
lp:x:7:lp
kmem:x:9:
wheel:x:10:root
floppy:x:11:root
mail:x:12:mail
news:x:13:news
uucp:x:14:uucp
cron:x:16:cron
audio:x:18:
cdrom:x:19:
dialout:x:20:root
ftp:x:21:
sshd:x:22:
input:x:23:
tape:x:26:root
video:x:27:root
netdev:x:28:
kvm:x:34:kvm
games:x:35:
shadow:x:42:
www-data:x:82:
users:x:1000:games,www-user
ntp:x:123:
abuild:x:300:
utmp:x:406:
ping:x:999:
nogroup:x:65533:
nobody:x:65534:
klogd:x:101:klogd
www-user:!:33:

[LinuxServer-CI]

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[LinuxServer-CI]

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