Is there any hope to run junest on this shared hosting config?

[rahulraj80]

[Newbie alert] Let me know if I should share some more info:

user~ 20:16:03 :( > uname -a

Linux xxxxx 4.14.146-225.ELK.el6.x86_64 #1 SMP Sat Sep 21 01:19:55 CDT 2019 x86_64 x86_64 x86_64 GNU/Linux

user~ 20:16:03 :( > lsb_release -a

LSB Version:
Distributor ID: n/a
Description:    (none)
Release:        n/a
Codename:       n/a

user ~ 20:12:16 :) > junest
OR
user ~ 20:13:33 :( > junest ns
OR
user ~ 20:13:42 :( > junest -f

Could not understand if user namespace is enabled. No config.gz file found. Proceeding anyway...
bwrap: No permissions to creating new namespace, likely because the kernel does not allow non-privileged user namespaces. On e.g. debian this can be enabled with 'sysctl kernel.unprivileged_userns_clone=1'.
Error: Something went wrong while executing bwrap command. Exiting

user ~ 20:13:46 :( > junest g

This script must be run with root privileges

user ~ 20:13:52 :( > junest p
OR
user ~ 20:13:56 :( > junest p -f

proot error: execve("/usr/bin/sh"): Permission denied
proot info: possible causes:
  * the program is a script but its interpreter (eg. /bin/sh) was not found;
  * the program is an ELF but its interpreter (eg. ld-linux.so) was not found;
  * the program is a foreign binary but qemu was not specified;
  * qemu does not work correctly (if specified);
  * the loader was not found or doesn't work.
fatal error: see `proot-x86_64 --help`.
proot info: pid 1289: terminated with signal 11
proot error: execve("/usr/bin/sh"): Permission denied
proot info: possible causes:
  * the program is a script but its interpreter (eg. /bin/sh) was not found;
  * the program is an ELF but its interpreter (eg. ld-linux.so) was not found;
  * the program is a foreign binary but qemu was not specified;
  * qemu does not work correctly (if specified);
  * the loader was not found or doesn't work.
fatal error: see `proot-x86_64 --help`.
proot error: can't chmod '/tmp/proot-1290-ognELf': No such file or directory
Error: Something went wrong with proot command. Exiting

[fsquillace]

Mmh this host seems tricky. It does not look like it has user NS enabled. You can't even modify files into /tmp?

[rahulraj80]

Hi,

I can modify, but cannot execute from that directory:

fy@cp-ht-8 ~ 22:06:40 :) > cd /tmp
fy@cp-ht-8 tmp 22:07:03 :( > nano test.sh
fy@cp-ht-8 tmp 22:07:33 :) > chmod +x test.sh
fy@cp-ht-8 tmp 22:07:42 :) > ./test.sh
-jailshell: ./test.sh: Permission denied

fy@cp-ht-8 tmp 22:07:57 :( > cat test.sh
#!/bin/bash
echo "OK"

[fsquillace]

That's may explain why proot mode does not work. Proot creates a temporary executable file under /tmp. In your example is: /tmp/proot-1290-ognELf.

Regarding the other namespace mode, the user NS is not enabled therefore it is not possible to do run it either.