More use examples
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README.md
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README.md
@ -116,6 +116,25 @@ The document has moved
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/ $
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```
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#### Bash in a minimal file-system with uid==0 and access to /dev/urandom
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```
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$ ./nsjail -Mo --user 0 --group 99999 --chroot "" -R /bin/ -R /lib -R /lib64/ -R /usr/ -R /sbin/ -T /dev -R /dev/urandom --keep_caps -- /bin/bash -i
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bash-4.3# ls -l /
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total 40
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drwxr-xr-x 2 65534 65534 12288 Jun 17 23:27 bin
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drwxrwxrwt 2 0 99999 60 Jun 19 12:31 dev
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drwxr-xr-x 25 65534 65534 4096 Jun 9 18:29 lib
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drwxr-xr-x 2 65534 65534 4096 Apr 15 22:27 lib64
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dr-xr-xr-x 260 65534 65534 0 Jun 19 12:31 proc
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drwxr-xr-x 2 65534 65534 16384 Jun 11 21:03 sbin
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drwxr-xr-x 21 65534 65534 4096 Apr 24 16:13 usr
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bash-4.3# ls -l /dev/
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total 0
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crw-rw-rw- 1 65534 65534 1, 9 Jun 9 18:33 urandom
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bash-4.3# id
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uid=0 gid=99999 groups=99999,65534
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```
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### MORE INFO?
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Type:
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```
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@ -127,7 +146,7 @@ Usage: ./nsjail [options] -- path_to_command [args]
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Options:
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--help|-h
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Help plz..
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--mode|-M [val]
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--mode|-M VALUE
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Execution mode (default: l [MODE_LISTEN_TCP]):
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l: Wait for connections on a TCP port (specified with --port) [MODE_LISTEN_TCP]
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o: Immediately launch a single process on a console using clone/execve [MODE_STANDALONE_ONCE]
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@ -135,27 +154,27 @@ Options:
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r: Immediately launch a single process on a console, keep doing it forever [MODE_STANDALONE_RERUN]
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--cmd
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Equivalent of -Mo (MODE_STANDALONE_ONCE), run command on a local console, once
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--chroot|-c [val]
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--chroot|-c VALUE
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Directory containing / of the jail (default: "/"). Skip mounting it if ""
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--rw
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Mount / as RW (default: RO)
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--user|-u [val]
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--user|-u VALUE
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Username/uid of processess inside the jail (default: your current uid). You can also use inside_ns_uid:outside_ns_uid convention here
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--group|-g [val]
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--group|-g VALUE
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Groupname/gid of processess inside the jail (default: your current gid). You can also use inside_ns_gid:global_ns_gid convention here
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--hostname|-H [val]
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--hostname|-H VALUE
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UTS name (hostname) of the jail (default: 'NSJAIL')
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--cwd|-D [val]
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--cwd|-D VALUE
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Directory in the namespace the process will run (default: '/')
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--port|-p [val]
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--port|-p VALUE
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TCP port to bind to (only in [MODE_LISTEN_TCP]) (default: 31337)
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--bindhost [val]
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IP address port to bind to (only in [MODE_LISTEN_TCP]) (default: '::')
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--max_conns_per_ip|-i [val]
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--bindhost VALUE
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IP address port to bind to (only in [MODE_LISTEN_TCP]), '::ffff:127.0.0.1' for locahost (default: '::')
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--max_conns_per_ip|-i VALUE
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Maximum number of connections per one IP (default: 0 (unlimited))
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--log|-l [val]
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--log|-l VALUE
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Log file (default: /proc/self/fd/2)
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--time_limit|-t [val]
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--time_limit|-t VALUE
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Maximum time that a jail can exist, in seconds (default: 600)
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--daemon|-d
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Daemonize after start
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@ -163,7 +182,7 @@ Options:
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Verbose output
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--keep_env|-e
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Should all environment variables be passed to the child?
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--env|-E [val]
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--env|-E VALUE
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Environment variable (can be used multiple times)
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--keep_caps
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Don't drop capabilities (DANGEROUS)
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@ -173,19 +192,21 @@ Options:
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Don't enable the seccomp-bpf sandboxing
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--skip_setsid
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Don't call setsid(), allows for terminal signal handling in the sandboxed process
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--rlimit_as [val]
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--pass_fd VALUE
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Don't close this FD before executing child (can be specified multiple times), by default: 0/1/2 are kept open
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--rlimit_as VALUE
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RLIMIT_AS in MB, 'max' for RLIM_INFINITY, 'def' for the current value (default: 512)
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--rlimit_core [val]
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--rlimit_core VALUE
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RLIMIT_CORE in MB, 'max' for RLIM_INFINITY, 'def' for the current value (default: 0)
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--rlimit_cpu [val]
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--rlimit_cpu VALUE
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RLIMIT_CPU, 'max' for RLIM_INFINITY, 'def' for the current value (default: 600)
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--rlimit_fsize [val]
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--rlimit_fsize VALUE
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RLIMIT_FSIZE in MB, 'max' for RLIM_INFINITY, 'def' for the current value (default: 1)
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--rlimit_nofile [val]
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--rlimit_nofile VALUE
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RLIMIT_NOFILE, 'max' for RLIM_INFINITY, 'def' for the current value (default: 32)
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--rlimit_nproc [val]
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--rlimit_nproc VALUE
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RLIMIT_NPROC, 'max' for RLIM_INFINITY, 'def' for the current value (default: 'def')
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--rlimit_stack [val]
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--rlimit_stack VALUE
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RLIMIT_STACK in MB, 'max' for RLIM_INFINITY, 'def' for the current value (default: 'def')
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--persona_addr_compat_layout
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personality(ADDR_COMPAT_LAYOUT)
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@ -209,24 +230,41 @@ Options:
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Don't use CLONE_NEWIPC
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--disable_clone_newuts
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Don't use CLONE_NEWUTS
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--bindmount_ro|-R [val]
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--enable_clone_newcgroup
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Use CLONE_NEWCGROUP
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--bindmount_ro|-R VALUE
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List of mountpoints to be mounted --bind (ro) inside the container. Can be specified multiple times. Supports 'source' syntax, or 'source:dest'
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--bindmount|-B [val]
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--bindmount|-B VALUE
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List of mountpoints to be mounted --bind (rw) inside the container. Can be specified multiple times. Supports 'source' syntax, or 'source:dest'
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--tmpfsmount|-T [val]
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--tmpfsmount|-T VALUE
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List of mountpoints to be mounted as RW/tmpfs inside the container. Can be specified multiple times. Supports 'dest' syntax
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--tmpfs_size [val]
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--tmpfs_size VALUE
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Number of bytes to allocate for tmpfsmounts (default: 4194304)
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--disable_proc
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Disable mounting /proc in the jail
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--cgroup_mem_mount VALUE
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Where to mount memory cgroup FS (default: '/cgroup_memory'
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--cgroup_mem_group VALUE
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Which memory cgroup to use (default: 'NSJAIL')
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--cgroup_mem_max VALUE
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Maximum number of bytes to use in the group
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--iface_no_lo
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Don't bring up the 'lo' interface
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--iface|-I [val]
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Interface which will be cloned (MACVTAP) and put inside the subprocess' namespace as 'vs'
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--iface_vs_ip [val]
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--iface|-I VALUE
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Interface which will be cloned (MACVLAN) and put inside the subprocess' namespace as 'vs'
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--iface_vs_ip VALUE
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IP of the 'vs' interface
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--iface_vs_nm [val]
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--iface_vs_nm VALUE
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Netmask of the 'vs' interface
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--iface_vs_gw [val]
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--iface_vs_gw VALUE
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Default GW for the 'vs' interface
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Examples:
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Wait on a port 31337 for connections, and run /bin/sh
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nsjail -Ml --port 31337 --chroot / -- /bin/sh -i
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Re-run echo command as a sub-process
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nsjail -Mr --chroot / -- /bin/echo "ABC"
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Run echo command once only, as a sub-process
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nsjail -Mo --chroot / -- /bin/echo "ABC"
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Execute echo command directly, without a supervising proces
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```
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