dsniff - password sniffer
dsniff [-c] [-d] [-m] [-n] [-i
interface] [-s snaplen] [-f
services] [-t trigger[,...]]] [-r|-w
savefile] [expression]
dsniff is a password sniffer which handles FTP, Telnet, SMTP, HTTP, POP,
poppass, NNTP, IMAP, SNMP, LDAP, Rlogin, RIP, OSPF, PPTP MS-CHAP, NFS, VRRP,
YP/NIS, SOCKS, X11, CVS, IRC, AIM, ICQ, Napster, PostgreSQL, Meeting Maker,
Citrix ICA, Symantec pcAnywhere, NAI Sniffer, Microsoft SMB, Oracle SQL*Net,
Sybase and Microsoft SQL protocols.
dsniff automatically detects and minimally parses each
application protocol, only saving the interesting bits, and uses Berkeley DB
as its output file format, only logging unique authentication attempts. Full
TCP/IP reassembly is provided by libnids(3).
I wrote dsniff with honest intentions - to audit my own
network, and to demonstrate the insecurity of cleartext network protocols.
Please do not abuse this software.
- -c
- Perform half-duplex TCP stream reassembly, to handle asymmetrically routed
traffic (such as when using arpspoof(8) to intercept client traffic bound
for the local gateway).
- -d
- Enable debugging mode.
- -m
- Enable automatic protocol detection.
- -n
- Do not resolve IP addresses to hostnames.
- -i interface
- Specify the interface to listen on.
- -s snaplen
- Analyze at most the first snaplen bytes of each TCP connection,
rather than the default of 1024.
- -f services
- Load triggers from a services file.
- -t trigger[,...]
- Load triggers from a comma-separated list, specified as
port/proto=service (e.g. 80/tcp=http).
- -r savefile
- Read sniffed sessions from a savefile created with the -w
option.
- -w file
- Write sniffed sessions to savefile rather than parsing and printing
them out.
- expression
- Specify a tcpdump(8) filter expression to select traffic to sniff.
On a hangup signal dsniff will dump its current trigger
table to dsniff.services.
- /usr/local/lib/dsniff.services
- Default trigger table
- /usr/local/lib/dsniff.magic
- Network protocol magic
arpspoof(8), libnids(3), services(5), magic(5)
Dug Song <dugsong@monkey.org>
dsniff's automatic protocol detection feature is based on the classic
file(1) command by Ian Darwin, and shares its historical limitations and bugs.