.TH NSJAIL "1" "August 2017" "nsjail" "User Commands"
\"
.SH NAME
nsjail \- process isolation tool for linux
\"
.SH SYNOPSIS
\fInsjail\fP [options] \fB\-\-\fR path_to_command [args]
\"
.SH DESCRIPTION
NsJail is a process isolation tool for Linux. It utilizes Linux namespace subsystem, resource limits, and the seccomp-bpf syscall filters of the Linux kernel
\"
.SH Options
.TP
\fB\-\-help\fR|\fB\-h\fR Help plz..
.TP
\fB\-\-mode\fR|\fB\-M\fR VALUE Execution mode (default: o [MODE_STANDALONE_ONCE]):
.IP
\fBl\fR: Wait for connections on a TCP port (specified with \fB\-\-port\fR) [MODE_LISTEN_TCP]
.PP
.IP
\fBo\fR: Immediately launch a single process on the console using clone/execve [MODE_STANDALONE_ONCE]
.PP
.IP
\fBe\fR: Immediately launch a single process on the console using execve [MODE_STANDALONE_EXECVE]
.PP
.IP
\fBr\fR: Immediately launch a single process on the console, keep doing it forever [MODE_STANDALONE_RERUN]
.PP
.TP
\fB\-\-config\fR|\fB\-C\fR VALUE
Configuration file in the config.proto ProtoBuf format
.TP
\fB\-\-exec_file\fR|\fB\-x\fR VALUE
File to exec (default: argv[0])
.TP
\fB\-\-chroot\fR|\fB\-c\fR VALUE
Directory containing / of the jail (default: none)
.TP
\fB\-\-rw\fR
Mount / and \fI/proc\fP as RW (default: RO)
.TP
\fB\-\-user\fR|\fB\-u\fR VALUE
Username/uid of processess inside the jail (default: your current uid). You can also use inside_ns_uid:outside_ns_uid:count convention here. Can be specified multiple times
.TP
\fB\-\-group\fR|\fB\-g\fR VALUE
Groupname/gid of processess inside the jail (default: your current gid). You can also use inside_ns_gid:global_ns_gid:count convention here. Can be specified multiple times
.TP
\fB\-\-hostname\fR|\fB\-H\fR VALUE
UTS name (hostname) of the jail (default: 'NSJAIL')
.TP
\fB\-\-cwd\fR|\fB\-D\fR VALUE
Directory in the namespace the process will run (default: '/')
.TP
\fB\-\-port\fR|\fB\-p\fR VALUE
TCP port to bind to (enables MODE_LISTEN_TCP) (default: 0)
.TP
\fB\-\-bindhost\fR VALUE
IP address to bind the port to (only in [MODE_LISTEN_TCP]), (default: '::')
.TP
\fB\-\-max_conns_per_ip\fR|\fB\-i\fR VALUE
Maximum number of connections per one IP (only in [MODE_LISTEN_TCP]), (default: 0 (unlimited))
.TP
\fB\-\-log\fR|\fB\-l\fR VALUE
Log file (default: use log_fd)
.TP
\fB\-\-log_fd\fR|\fB\-L\fR VALUE
Log FD (default: 2)
.TP
\fB\-\-time_limit\fR|\fB\-t\fR VALUE
Maximum time that a jail can exist, in seconds (default: 600)
.TP
\fB\-\-max_cpus\fR VALUE
Maximum number of CPUs a single jailed process can use (default: 0 'no limit')
.TP
\fB\-\-daemon\fR|\fB\-d\fR
Daemonize after start
.TP
\fB\-\-verbose\fR|\fB\-v\fR
Verbose output
.TP
\fB\-\-quiet\fR|\fB\-q\fR
Log warning and more important messages only
.TP
\fB\-\-realy_quiet\fR|\fB\-Q\fR
Log fatal messages only
.TP
\fB\-\-keep_env\fR|\fB\-e\fR
Should all environment variables be passed to the child?
.TP
\fB\-\-env\fR|\fB\-E\fR VALUE
Environment variable (can be used multiple times)
.TP
\fB\-\-keep_caps\fR
Don't drop capabilities in the local namespace
.TP
\fB\-\-silent\fR
Redirect child's fd:0/1/2 to /dev/null
.TP
\fB\-\-skip_setsid\fR
Don't call setsid(), allows for terminal signal handling in the sandboxed process
.TP
\fB\-\-pass_fd\fR VALUE
Don't close this FD before executing child (can be specified multiple times), by default: 0/1/2 are kept open
.TP
\fB\-\-disable_no_new_privs\fR
Don't set the prctl(NO_NEW_PRIVS, 1) (DANGEROUS)
.TP
\fB\-\-cap\fR VALUE
Retain this capability in local namespace (e.g. CAP_PTRACE). Can be specified multiple times
.TP
\fB\-\-rlimit_as\fR VALUE
RLIMIT_AS in MB, 'max' or 'hard' for the current hard limit, 'def' or 'soft' for the current soft limit, 'inf' for RLIM_INFINITY (default: 512)
.TP
\fB\-\-rlimit_core\fR VALUE
RLIMIT_CORE in MB, 'max' or 'hard' for the current hard limit, 'def' or 'soft' for the current limit, 'inf' for RLIM_INFINITY (default: 0)
.TP
\fB\-\-rlimit_cpu\fR VALUE
RLIMIT_CPU, 'max' or 'hard' for the current hard limit, 'def' or 'soft' for the current soft limit, 'inf' for RLIM_INFINITY (default: 600)
.TP
\fB\-\-rlimit_fsize\fR VALUE
RLIMIT_FSIZE in MB, 'max' or 'hard' for the current hard limit, 'def' or 'soft' for the current soft limit, 'inf' for RLIM_INFINITY (default: 1)
.TP
\fB\-\-rlimit_nofile\fR VALUE
RLIMIT_NOFILE, 'max' or 'hard' for the current hard limit, 'def' or 'soft' for the current limit, 'inf' for RLIM_INFINITY (default: 32)
.TP
\fB\-\-rlimit_nproc\fR VALUE
RLIMIT_NPROC, 'max' or 'hard' for the current hard limit, 'def' or 'soft' for the current soft limit, 'inf' for RLIM_INFINITY (default: 'soft')
.TP
\fB\-\-rlimit_stack\fR VALUE
RLIMIT_STACK in MB, 'max' or 'hard' for the current hard limit, 'def' or 'soft' for the current soft limit, 'inf' for RLIM_INFINITY (default: 'soft')
.TP
\fB\-\-persona_addr_compat_layout\fR
personality(ADDR_COMPAT_LAYOUT)
.TP
\fB\-\-persona_mmap_page_zero\fR
personality(MMAP_PAGE_ZERO)
.TP
\fB\-\-persona_read_implies_exec\fR
personality(READ_IMPLIES_EXEC)
.TP
\fB\-\-persona_addr_limit_3gb\fR
personality(ADDR_LIMIT_3GB)
.TP
\fB\-\-persona_addr_no_randomize\fR
personality(ADDR_NO_RANDOMIZE)
.TP
\fB\-\-disable_clone_newnet\fR|\-N
Don't use CLONE_NEWNET. Enable networking inside the jail
.TP
\fB\-\-disable_clone_newuser\fR
Don't use CLONE_NEWUSER. Requires euid==0
.TP
\fB\-\-disable_clone_newns\fR
Don't use CLONE_NEWNS
.TP
\fB\-\-disable_clone_newpid\fR
Don't use CLONE_NEWPID
.TP
\fB\-\-disable_clone_newipc\fR
Don't use CLONE_NEWIPC
.TP
\fB\-\-disable_clone_newuts\fR
Don't use CLONE_NEWUTS
.TP
\fB\-\-enable_clone_newcgroup\fR
Use CLONE_NEWCGROUP
.TP
\fB\-\-uid_mapping\fR|\fB\-U\fR VALUE
Add a custom uid mapping of the form inside_uid:outside_uid:count. Setting this requires newuidmap to be present
.TP
\fB\-\-gid_mapping\fR|\fB\-G\fR VALUE
Add a custom gid mapping of the form inside_gid:outside_gid:count. Setting this requires newgidmap to be present
.TP
\fB\-\-bindmount_ro\fR|\fB\-R\fR VALUE
List of mountpoints to be mounted \fB\-\-bind\fR (ro) inside the container. Can be specified multiple times. Supports 'source' syntax, or 'source:dest'
.TP
\fB\-\-bindmount\fR|\fB\-B\fR VALUE
List of mountpoints to be mounted \fB\-\-bind\fR (rw) inside the container. Can be specified multiple times. Supports 'source' syntax, or 'source:dest'
.TP
\fB\-\-tmpfsmount\fR|\fB\-T\fR VALUE
List of mountpoints to be mounted as RW/tmpfs inside the container. Can be specified multiple times. Supports 'dest' syntax
.TP
\fB\-\-tmpfs_size\fR VALUE
Number of bytes to allocate for tmpfsmounts (default: 4194304)
.TP
\fB\-\-disable_proc\fR
Disable mounting \fI/proc\fP in the jail
.TP
\fB\-\-seccomp_policy\fR|\fB\-P\fR VALUE
Path to file containing seccomp\-bpf policy (see kafel/)
.TP
\fB\-\-seccomp_string\fR VALUE
String with kafel seccomp\-bpf policy (see kafel/)
.TP
\fB\-\-cgroup_mem_max\fR VALUE
Maximum number of bytes to use in the group (default: '0' \- disabled)
.TP
\fB\-\-cgroup_mem_mount\fR VALUE
Location of memory cgroup FS (default: '/sys/fs/cgroup/memory')
.TP
\fB\-\-cgroup_mem_parent\fR VALUE
Which pre\-existing memory cgroup to use as a parent (default: 'NSJAIL')
.TP
\fB\-\-cgroup_pids_max\fR VALUE
Maximum number of pids in a cgroup (default: '0' \- disabled)
.TP
\fB\-\-cgroup_pids_mount\fR VALUE
Location of pids cgroup FS (default: '/sys/fs/cgroup/pids')
.TP
\fB\-\-cgroup_pids_parent\fR VALUE
Which pre\-existing pids cgroup to use as a parent (default: 'NSJAIL')
.TP
\fB\-\-iface_no_lo\fR
Don't bring up the 'lo' interface
.TP
\fB\-\-macvlan_iface\fR|\fB\-I\fR VALUE
Interface which will be cloned (MACVLAN) and put inside the subprocess' namespace as 'vs'
.TP
\fB\-\-macvlan_vs_ip\fR VALUE
IP of the 'vs' interface (e.g. "192.168.0.1")
.TP
\fB\-\-macvlan_vs_nm\fR VALUE
Netmask of the 'vs' interface (e.g. "255.255.255.0")
.TP
\fB\-\-macvlan_vs_gw\fR VALUE
Default GW for the 'vs' interface (e.g. "192.168.0.1")
\"
.SH Deprecated options
.TP
\fB\-\-iface\fR|\fB\-I\fR VALUE
Interface which will be cloned (MACVLAN) and put inside the subprocess' namespace as 'vs'
DEPRECATED: Use macvlan_iface instead.
.TP
\fB\-\-iface_vs_ip\fR VALUE
IP of the 'vs' interface (e.g. "192.168.0.1")
DEPRECATED: Use macvlan_vs_ip instead.
.TP
\fB\-\-iface_vs_nm\fR VALUE
Netmask of the 'vs' interface (e.g. "255.255.255.0")
DEPRECATED: Use macvlan_vs_nm instead.
\fB\-\-iface_vs_gw\fR VALUE
Default GW for the 'vs' interface (e.g. "192.168.0.1")
DEPRECATED: Use macvlan_vs_gw instead.
\"
.SH Examples
.PP
Wait on a port 31337 for connections, and run /bin/sh:
.IP
nsjail \-Ml \-\-port 31337 \-\-chroot / \-\- /bin/sh \-i
.PP
Re\-run echo command as a sub\-process:
.IP
nsjail \-Mr \-\-chroot / \-\- /bin/echo "ABC"
.PP
Run echo command once only, as a sub\-process:
.IP
nsjail \-Mo \-\-chroot / \-\- /bin/echo "ABC"
.PP
Execute echo command directly, without a supervising process:
.IP
nsjail \-Me \-\-chroot / \-\-disable_proc \-\- /bin/echo "ABC"
\"