NAME¶
scanssh —
scans the Internet for open
proxies and SSH servers
SYNOPSIS¶
| scanssh |
[-VIERph]
[-s
scanners,...]
[-n
ports,...]
[-e
excludefile]
addresses... |
DESCRIPTION¶
ScanSSH scans the given addresses and networks for running
services. It mainly allows the detection of open proxies and Internet
services. For known services,
ScanSSH will query their
version number and displays the results in a list.
The adresses can be either specified as an IPv4 address or an CIDR like IP
prefix,
ipaddress/masklength. Ports can be appended by
adding a colon at the end of address specification.
Additionally, the following two commands can be prefixed to the address:
- random(n[,seed])/
- The random command selects random address from the address
range specified. The arguments are as follows: n is
the number of address to randomly create in the given network and
seed is a seed for the pseudo random number
generator.
- split(s,e)/
- The split command is used to split the address range in
several unique components. This can be use to scan from serveral hosts in
parallel. The arguments are as follows: e specifies
the number of hosts scanning in parallel and s is
the number of the host this particular scan runs on.
The options are as follows:
- -V
- Causes scanssh to print its version
number.
- -I
- Does not send a SSH identification string.
- -E
- Exit the program, if the file containing the addresses for
exclusion can not be found.
- -R
- If addresses are generated at random, this flag causes the
program to ignore excluded addresses from the exclude file. The default
behaviour is to always exclude addresses.
- -p
- Specifies that ScanSSH should operate as
a proxy detector. This flag sets the default modes and default scanners to
detect open proxies.
- -h
- Displays the usage of the program.
- -n
ports,...
- Specifies the port numbers to scan. Ports are separated by
commas. Each specified scanner is run for each port in this list. The
default is 22.
- -s
scanners
- Specifies a number of scanners should be executed for each
open port. Multiple scanners are separated by commas. The following
scanners are currently supported:
- ssh
- Finds versions for SSH, Web and SMTP servers.
- socks5
- Detects if a SOCKS V5 proxy is running on the
port.
- socks4
- Detects if a SOCKS V4 proxy is running on the
port.
- http-proxy
- Detects a HTTP get proxy.
- http-connect
- Detects a HTTP connect proxy.
- telnet-proxy
- Detects telnet based proxy servers.
- -e
excludefile
- Specifies the file that contains the addresses to be
excluded from the scan. The syntax is the same as for the addresses on the
command line.
The output from
scanssh contains only IP addresses. However,
the IP addresses can be converted to names with the
logresolve(8) tool included in the Apache webserver.
EXAMPLES¶
The following command scans the class C network 10.0.0.0 - 10.0.0.255 for open
proxies:
The next command scans for ssh servers on port 22 only:
scanssh -n 22 -s ssh 192.168.0.0/16
The following command can be used in a parallel scan. Two hosts scan the
specified networks randomly, where this is the first host:
scanssh 'random(0,rsd)/split(1,2)/(192.168.0.0/16 10.1.0.0/24):22,80'
BUGS¶
At the moment,
scanssh leaves a one line entry in the log file
of the ssh server. It is probably not possible to avoid that.
