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An overview of secure communications with Jabber/XMPP IM technologies
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Secure Communications with Jabber
1.
Jabber security
2.
Peter Saint-Andre
3.
stpeter@jabber.org
4.
5.
https://stpeter.im/
6.
secure communication
7.
with Jabber
8.
what is Jabber?
9.
open XML technologies
10.
real-time messaging
11.
presence
12.
multimedia negotiation
13.
collaboration
14.
and more
15.
invented by Jeremie
Miller in 1998
16.
in essence...
17.
streaming XML
18.
over long-lived TCP connection
19.
client-server architecture
20.
decentralized network
21.
inter-domain messaging
22.
like email
23.
but really fast
24.
with built-in presence
25.
not just one open-source
project
26.
multiple codebases
27.
open-source and
commercial
28.
interoperability via XML wire
protocol
29.
core protocol standardized @
IETF
30.
Extensible
31.
Messaging
32.
and
33.
Presence
34.
Protocol
35.
(XMPP)
36.
RFCs 3920 +
3921
37.
multiple implementations
38.
serious deployment
39.
how many users?
40.
we don’t know
41.
decentralized architecture
42.
100k+ servers
43.
50+ million IM
users
44.
not just IM
45.
generic XML routing
46.
lots of applications
beyond IM
47.
continually defining XMPP
extensions
48.
XMPP Standards Foundation (XSF)
49.
developer-driven standards group
50.
that’s great, but...
51.
how secure is
it?
52.
what is security?
53.
secure conversation
in real life...
54.
a good friend visits
your home
55.
you know and
trust each other
56.
only the two
of you
57.
strangers can’t enter
your home
58.
your home is
not bugged
59.
conversation is not
recorded
60.
what you say
is private and confidential
61.
contrast that with
the Internet...
62.
lots of potential
attacks
63.
man-in-the-middle
64.
eavesdropping
65.
unauthenticated users
66.
address spoofing
67.
weak identity
68.
rogue servers
69.
denial of service
70.
directory harvesting
71.
buffer overflows
72.
spam
73.
spim
74.
spit
75.
splogs
76.
viruses
77.
worms
78.
trojan horses
79.
malware
80.
phishing
81.
pharming
82.
information leaks
83.
inappropriate logging
and archiving
84.
you get the
picture
85.
the Internet is
a dangerous place
86.
how do we
fight these threats?
87.
sorry, but...
88.
Jabber is not
a perfect technology
89.
not originally built
for high security
90.
don’t require PGP
keys or X.509 certs
91.
don’t require ubiquitous
encryption
92.
tradeoffs between security and
usability
93.
maybe that’s why
we have 50+ million users...
94.
but privacy and
security are important
95.
so what have
we done to help?
96.
Jabber architecture...
97.
98.
similar to email
99.
client connects to server
(TCP 5222)
100.
(or connect via
HTTP binding over SSL)
101.
client MUST authenticate
102.
originally: plaintext (!)
or hashed password
103.
Simple Authentication &
Security Layer (SASL)
104.
RFC 4422
105.
many SASL mechanisms
106.
PLAIN (OK over encrypted
connection)
107.
DIGEST-MD5
108.
EXTERNAL (with
X.509 certs)
109.
GSSAPI (a.k.a. Kerberos)
110.
ANONYMOUS
111.
etc.
112.
all users are authenticated
113.
sender addresses not
merely asserted
114.
server stamps user ‘from’
address
115.
Jabber IDs are logical
addresses
116.
IP addresses not exposed
117.
Jabber ID looks
like an email address
118.
romeo@montague.net
119.
juliet@capulet.com
120.
not limited to US-ASCII
characters
121.
jiři@čechy.cz
122.
πλατω@ἑλλας.gr
123.
มฌำปจ@jabber.th
124.
@jabber.jp
125.
∞@math.it
126.
full Unicode opens
phishing attacks
127.
STPETER@jabber.org ᏚᎢᎵᎬᎢᎬᏒ@jabber.org
128.
clients should use
“petnames”
129.
store in buddy
list [tm] (a.k.a. “roster”)
130.
server stores your
roster
131.
server broadcasts
your presence
132.
but only to
subscribers you have authorized
133.
most traffic goes through
server
134.
traffic is pure
XML
135.
servers reject malformed XML
136.
servers may validate traffic
against schemas
137.
difficult to inject
binary objects
138.
difficult to propagate
malware
139.
break alliance between
viruses and spam
140.
spam virtually unknown
on Jabber network
141.
why?
142.
hard to spoof
addresses
143.
hard to send inline
binary
144.
XHTML subset (no scripts
etc.)
145.
user approval required
for file transfer
146.
privacy lists to
block unwanted users
147.
XMPP not immune
to spam
148.
have spam-fighting tools
ready when it appears
149.
challenge-response to register
an account
150.
challenge-response to
communicate
151.
spam reporting
152.
working on more
anti-spam tools
153.
server reputation
system?
154.
anonymized IP address?
(groupchat spam)
155.
spammers need to
overcome...
156.
bandwidth limits
157.
connection limits
158.
other denial-of-service prevention
measures
159.
distributed attack or
run a rogue server
160.
not impossible
161.
just harder than
other networks (got email?)
162.
no rogue servers
(yet)
163.
optional to federate with
other servers
164.
many private XMPP servers
165.
public servers federate as
needed (TCP 5269)
166.
DNS lookup to
get server IP address
167.
only one hop between
servers
168.
server identities
are validated
169.
server dialback (identity verification)
170.
effectively prevents
server spoofing
171.
receiving server checks
sending domain
172.
no messages from “service@paypal.com”
173.
DNS poisoning can invalidate
174.
need something
stronger?
175.
Transport Layer Security
(TLS)
176.
RFC 4346
177.
IETF “upgrade” to
SSL
178.
TLS + SASL
EXTERNAL with X.509 certs
179.
strong authentication
of other servers
180.
but only if
certs are not self-signed
181.
$$$
182.
real X.509 certs
are expensive
183.
VeriSign, Thawte, etc.
184.
a better way...
185.
xmpp.net
186.
intermediate CA for
XMPP network
187.
free digital certificates for
XMPP server admins
188.
(need to prove
you own the domain)
189.
root CA: StartCom
190.
ICA: XMPP Standards
Foundation
191.
hopefully other CAs
in future
192.
so channel encryption
is a no-brainer
193.
man-in-the-middle is much
harder
194.
“Mallory” is foiled
195.
but what about “Isaac”
and “Justin”?
196.
197.
we can encrypt
the channels
198.
but traffic is
cleartext within servers!
199.
need end-to-end encryption (“e2e”)
200.
first try: OpenPGP
(XEP-0027)
201.
great for geeks
202.
but Aunt Tillie doesn’t
use PGP
203.
second try: S/MIME
(RFC 3923)
204.
great for geeks
(and some employees)
205.
but Aunt Tillie doesn’t
use X.509
206.
XML encryption and
digital signatures?
207.
seems natural, but
not much interest (c14n?)
208.
doesn’t provide perfect
forward secrecy
209.
off-the-record communication (OTR)?
210.
great idea
211.
opportunistic encryption (à la
SSH)
212.
perfect forward secrecy
213.
but encrypts only
the plaintext message body
214.
we need to
encrypt the entire packet
215.
why?
216.
because XMPP is
more than just IM
217.
protect IPs sent
in multimedia negotiation
218.
protect shared XML
editing data
219.
etc.
220.
solution: encrypted
sessions
221.
big set of requirements...
222.
packets are confidential
223.
packet integrity
224.
replay protection
225.
key compromise does not
reveal past comms
226.
don’t depend on
public key infrastructure
227.
entities authenticated
to each other
228.
3rd parties cannot
identify entities
229.
robustness against attack (multiple
hurdles)
230.
upgradeability if bugs
are discovered
231.
encryption of full
XMPP packets
232.
implementable by typical
developer
233.
usable by typical user
234.
how to address
all requirements?
235.
just a dream?
236.
bootstrap from cleartext to
encryption
237.
in-band Diffie-Hellman
key exchange
238.
translate “SIGMA” approach to
XMPP
239.
similar to Internet
Key Exchange (IKE)
240.
details in XSF
XEPs 116, 188, 200
241.
simplified profile
in XEP-0217
242.
major priority for
2007-2008
243.
support from NLnet
(thanks!)
244.
pursuing full security analysis
245.
code bounties
246.
GSoC project
247.
Jabber security summit
248.
more at blog.xmpp.org
249.
wide implementation in next
~12 months
250.
so how are
we doing?
251.
spam free
252.
hard to spoof
addresses
253.
pure XML discourages
binary malware
254.
DoS attacks possible
but not easy
255.
widespread channel
encryption
256.
working hard on end-to-end
encryption
257.
widely deployed in
high- security environments
258.
Wall Street investment banks
259.
U.S. military
260.
MIT and other
universities
261.
many public servers
since 1999
262.
no major security
breaches
263.
can’t be complacent
264.
always more to
do
265.
security is a
never- ending process
266.
analysis and hacking
are encouraged
267.
if it breaks,
we’ll fix it
268.
security@xmpp.org
269.
join the conversation
270.
let’s build a more
secure Internet
Download now