napoli-mail - cert.garr.it · title: microsoft powerpoint - napoli-mail.ppt created date: 2/3/2000...

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1 Incontri di GARR-B Claudio Allocchio & Luca dell’Agnello Mail e Security Incontri di GARR-B Claudio Allocchio Luca dell’Agnello [email protected] [email protected]

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Page 1: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

1

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Mai

l e S

ecur

ityIn

cont

ri d

i GA

RR

-BC

laud

io A

lloc

chio

Luc

a de

ll’A

gnel

loC

laud

io.A

llocc

hio@

garr

.it

Luc

a.de

llAgn

ello

@ga

rr.it

Page 2: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

2

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Som

mar

io

•S

ervi

zio

Mai

l: co

ncet

ti e

ser

vizi

di b

ase.

..

•...

e “

rice

vute

” (D

SN, M

DN

)

•L

a si

cure

zza:

SPA

M, P

riva

cy, V

irus

, Hoa

xes.

..

•L

o st

ato

del s

oftw

are

•C

ome

prot

egge

rsi:

conf

igur

azio

ni, f

iltri

, fir

ewal

l

•Pr

oble

mi?

Com

e in

terv

enir

e

•Pr

even

zion

e: c

ome

info

rmar

e e

educ

are

l’ut

enza

Page 3: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

3

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Use

r A

gent

(U

A)

•C

osa

fa in

tram

issi

one:

–In

tera

gisc

e co

n l’

Ute

nte

(int

erfa

ccia

test

o o

graf

ica)

–C

odif

ica

il m

essa

ggio

(con

for

mat

o A

)

–T

rasm

ette

il m

essa

ggio

(ad

un M

TA

di s

olit

o pr

edef

inito

)

•C

osa

fa in

ric

ezio

ne:

–R

icev

e il

mes

sagg

io (d

a un

MS

di s

olito

pre

defi

nito

)

–D

ecod

ific

a il

mes

sagg

io (c

on f

orm

ato

A)

–Pr

esen

ta il

mes

sagg

io a

ll’U

tent

e (i

nter

facc

ia te

sto

o gr

afic

a)

–In

tera

gisc

e co

n l’

Ute

nte

(ris

post

a, a

rchi

viaz

ione

, ...)

UA

Page 4: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

4

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Mes

sage

Tra

nspo

rt A

gent

(M

TA

)

•C

osa

fa:

–R

icev

e il

mes

sagg

io (d

a un

UA

o d

a un

MT

A)

–E

sam

ina

le in

form

azio

ni d

i Rou

ting

(da

data

base

loca

li o

dist

ribu

iti)

–T

rasm

ette

il m

essa

ggio

(ad

un a

ltro

MT

A o

da

un m

ailb

ox

serv

er)

MT

A

Page 5: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

5

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Mai

lbox

Acc

ess

Serv

er (

MS)

•C

osa

fa:

–R

icev

e il

mes

sagg

io (d

a un

MT

A)

–T

rasm

ette

il m

essa

ggio

(ad

uno

UA

)

–A

gisc

e su

l dat

abas

e m

essa

ggi (

su c

oman

di d

i uno

UA

)

MS

Page 6: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

6

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Lis

t Ser

ver

(LS)

•C

osa

fa:

–R

icev

e il

mes

sagg

io (d

a un

MT

A)

–D

ecod

ific

a il

mes

sagg

io (c

ome

uno

UA

)

–E

sam

ina

il da

taba

se d

i dis

trib

uzio

ne (i

scri

tti a

lla li

sta)

–C

odif

ica

il m

essa

ggio

in N

cop

ie (c

ome

uno

UA

)

–T

rasm

ette

il m

essa

ggio

(al p

ropr

io M

TA

)

LS

Page 7: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

7

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Mai

l Gat

eway

(G

W)

•C

osa

fa:

–R

icev

e il

mes

sagg

io (d

a un

MT

A c

on m

ail p

roto

col A

)

–D

ecod

ific

a il

cont

enut

o (c

ome

uno

UA

con

for

mat

o A

)

–C

odif

ica

il co

nten

uto

(com

e un

o U

A c

on f

orm

ato

B)

–T

rasm

ette

il m

essa

ggio

(ad

un a

ltro

MT

A c

on m

ail p

roto

col B

)

GW

Page 8: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

8

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Mai

l Tra

nspo

rt S

ervi

ceM

TS

Glo

bale

Int

erne

t

UA

LS

MT

A

SM

TP

MT

AS

MT

P

GW

SM

TP

MS

UA

IMA

P

PO

P3

MT

A

SM

TP

MS

UA

IMA

P

PO

P3

Page 9: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

9

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Del

iver

y St

atus

Not

ific

atio

n (D

SN)

•R

icev

uta

invi

ata

al m

itten

te q

uand

o vi

ene

scri

tto il

m

essa

ggio

nel

MS

del

des

tinat

ario

•N

ON

e’

disa

bilit

abile

•E

’ un

for

mat

o ST

AN

DA

RD

pre

defi

nito

•N

on tu

tti g

li U

A n

e pe

rmet

tono

la r

ichi

esta

•N

on tu

tti g

li M

TA

, GW

, LS

la s

uppo

rtan

o

DSN

Page 10: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

10

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

DSN

UA

MT

AM

TA

MS

ES

MT

P

DS

NE

SM

TP

DS

N

MS

IMA

P PO

P3

DS

N

DS

N

Cas

o N

orm

ale

... I

l Des

tinat

ario

NO

N in

terv

iene

!

Page 11: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

11

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

•R

icev

uta

al m

itten

te c

he v

iene

invi

ata

su a

zion

e de

l “le

ttore

” su

l mes

sagg

io d

entr

o il

MS

•E

’ di

sabi

litab

ile

•E

’ in

for

mat

o ST

AN

DA

RD

pre

defi

nito

•N

on tu

tti g

li U

A n

e pe

rmet

tono

la r

ichi

esta

•N

on tu

tti g

li U

A (

e si

mili

) e

MT

A la

sup

port

ano

Mes

sage

Del

iver

y N

otif

icat

ion

(MD

N)

MD

N

Page 12: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

12

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

MD

N

UA

MT

AM

TA

MS

ES

MT

P

MD

NE

SM

TP

MD

N

MS

IMA

P PO

P3

MD

N

MD

N

Cas

o N

orm

ale

UA

IMA

P

PO

P3

MD

N

MD

NE

SM

TP

...M

DN

gen

erat

a da

ll’az

ione

del D

estin

atar

io (

uman

o e/

o so

ftw

are)

!

Page 13: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

13

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Secu

rity

: i P

rinc

ipi

•Im

pedi

re c

attu

ra d

elle

pas

swor

d (p

eeki

ng)

•Im

pedi

re lo

SPA

M

•Id

entif

icar

e so

rgen

ti d

i atta

cco

•Pr

oteg

gere

le L

AN

dal

l’es

tern

o

•G

aran

tire

aute

ntic

ita’

del m

itten

te

•G

aran

tire

inte

grita

’ e/

o ri

serv

atez

za d

el m

essa

ggio

Page 14: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

14

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Pass

wor

d Pe

ek

•A

uten

ticaz

ione

Clie

nt-S

erve

r: p

assw

ord

in c

hiar

o

•In

stal

lare

SSL

, anc

he e

sop

rattu

tto s

ulle

LA

N

•U

tiliz

zare

Clie

nt-S

erve

r co

n su

ppor

to S

SL o

ppur

e ut

ilizz

are

il tu

nnel

SSL

•P

rote

gger

e il

LO

G f

iles

del S

erve

r (P

OP

o IM

AP)

Page 15: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

15

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

SPA

M

•In

vio

di m

iglia

ia d

i mes

sagg

i a “

spes

e al

trui

”:

MT

A e

ris

orse

di r

ete

(ban

da)

•U

tiliz

zo d

i acc

ount

gra

tuiti

(A

OL

, Com

puse

rve,

m

sn, h

otm

ail,

tin, l

iber

o, ti

scal

i,...)

•U

tiliz

zo d

i sof

twar

e “p

er s

pam

min

g”

•Sp

amm

ing

“ing

enuo

•L

a le

gge

e lo

SP

AM

: DL

185

/99

Page 16: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

16

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Tip

olog

ie d

i mai

l spa

m

•C

lass

ico:

“un

auth

oriz

ed m

ail r

elay

ing”

•D

elitt

o Pe

rfet

to: “

dopp

iono

n de

live

ry”

•A

ttacc

o D

iret

to: “

forg

ed e

-mai

l add

ress

Page 17: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

17

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Cla

ssic

o: R

elay

non

aut

oriz

zato

Est

erno

Inte

rno

MT

A

Page 18: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

18

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Cos

a e’

“In

tern

o” ?

•il

dom

inio

e’

uno

dei p

ropr

i dom

ini

•l’

indi

rizz

o IP

del

l’ho

st e

’ lo

cale

•l’

indi

rizz

o IP

e’

un I

P au

tori

zzat

o

•L

HS

o m

ail a

ddre

ss a

utor

izza

to

•IP

-->

nom

e co

rris

pond

e co

n P

TR

RR

•...

ma

NO

N b

asta

!

Page 19: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

19

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Mitt

ente

“In

tern

o”

•Se

indi

rizz

o IP

e’

loca

le e

dom

inio

e’

loca

le

•Se

indi

rizz

o IP

e’

loca

le e

dom

inio

e’

rem

oto

•Se

indi

rizz

o IP

e’

loca

le e

non

c’e

’ do

min

io

e’ p

iu’

diff

icile

fal

sifi

care

l’in

diri

zzo

IP d

el m

itten

te

se n

on s

i app

artie

ne a

lla L

AN

loca

le,q

uind

i...

AM

ME

SSO

tutto

il r

elay

per

tutte

le d

estin

azio

ni

Page 20: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

20

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Mitt

ente

“E

ster

no”

•Se

indi

rizz

o IP

e’

rem

oto

e do

min

io e

’ re

mot

o

•Se

indi

rizz

o IP

e’

rem

oto

e no

n c’

e’ d

omin

io

AM

ME

SSO

tutto

il r

elay

solo

per

le d

estin

azio

ni

LO

CA

LI

Page 21: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

21

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Mitt

ente

“Fa

lsif

icat

o”•

Se in

diri

zzo

IP e

’ re

mot

o e

dom

inio

e’

loca

le

RIF

IUT

A Q

UA

LS

IASI

DE

STIN

AZ

ION

E !

!

Page 22: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

22

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Des

tina

tari

o “I

nter

no”

•Se

il d

omin

io e

’ lo

cale

o tr

a i d

omin

i “M

X”

AC

CE

TT

A s

empr

e il

mes

sagg

io p

er la

con

segn

a.

Page 23: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

23

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Des

tina

tari

o “E

ster

no”

•Se

il d

omin

io N

ON

e’

loca

le o

NO

N e

’ tr

a i d

omin

i “M

X”

AC

CE

TT

A il

mes

sagg

io p

er la

con

segn

aSO

LO

se

il

mitt

ente

e’

“int

erno

”.

Page 24: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

24

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Ese

mpi

o di

Filt

ri -

1

Ele

nco

dom

ini “

loca

li”:

trie

ste.

infn

.it

ts.in

fn.it

elet

tra.

trie

ste.

it

Ele

nco

indi

rizz

i IP

“loc

ali”

:

140.

105.

6.0

Page 25: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

25

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Ese

mpi

o di

Filt

ri -

2

indi

rizz

o m

itten

te:

Mar

io.R

ossi

@ts

.infn

.it

IP m

itten

te:

140.

105.

6.93

Mitt

ente

“lo

cale

” O

K, p

uo’

sped

ire

dovu

nque

.

Page 26: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

26

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Ese

mpi

o di

Filt

ri -

3

indi

rizz

o m

itten

te:

Car

lo.B

ianc

hi@

elet

tra.

trie

ste.

it

IP m

itten

te:

140.

104.

4.3

Mitt

ente

NO

N “

loca

le”,

puo

’ sp

edir

e so

lo a

de

stin

atar

i “lo

cali”

.

Page 27: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

27

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Ese

mpi

o di

Filt

ri -

4

indi

rizz

o m

itten

te:

Jack

.Spa

m@

ts.in

fn.it

IP m

itten

te:

205.

19.6

1.18

Mitt

ente

FA

LSI

FIC

AT

O!

non

puo

’ sp

edir

e a

ness

uno

Page 28: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

28

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Cas

o C

lass

ico:

con

side

razi

oni

•Il

pro

prio

MT

A h

a pr

oble

mi:

–po

treb

be n

on e

sser

e la

ver

sion

e s/

w c

orre

tta

–po

treb

be n

on a

vere

i fi

ltri c

orre

tti in

stal

lati

–po

treb

be a

vere

i fi

ltri m

al c

onfi

gura

ti

•E

’ un

cas

o gr

ave:

segn

alar

e al

CE

RT

e in

terv

enir

e im

med

iata

men

te!

•Q

uand

o si

vie

ne a

ttac

cati,

si f

inis

ce s

ubito

nel

le

liste

dei

siti

“vu

lner

abili

”: la

situ

azio

ne p

reci

pita

!

•In

cas

o di

impo

ssib

ilita

’ di

inte

rven

to s

ul M

TA

, di

sabi

litar

lo o

filt

rarl

o su

i rou

ter!

Page 29: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

29

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

To:

vic

tim@

dest

dom

Subj

ect:

non

deliv

ery

Err

or: n

o su

ch u

ser

‘nob

ody’

From

: vic

tim@

dest

dom

To:

nob

ody@

rela

yd

spam

text

...

Del

itto

Perf

etto

: dop

pio

non

deliv

ery

From

: vic

tim@

dest

dom

To:

nob

ody@

rela

ydSu

bjec

t: bu

y m

y st

uff

spam

text

...

Est

erno

: des

tdom

Inte

rno:

rel

ayd

MT

Afo

rre

layd

Est

erno

: spa

md

Page 30: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

30

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Del

itto

Perf

etto

: con

side

razi

oni

•I

“filt

ri”

non

funz

iona

no

•L

’ute

nte

ha d

iffi

colta

’ a

com

pren

dere

cos

a su

cced

e

•L

asci

a “l

og f

iles”

app

aren

tem

ente

con

trad

ditto

ri

•M

asch

era

meg

lio il

mitt

ente

•Sp

edis

ce u

n so

lo m

essa

ggio

per

vol

ta

•Il

pro

prio

MT

A e

’ in

noce

nte

!

•Se

gnal

are

l’in

cide

nte

al C

ER

T

Page 31: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

31

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Atta

cco

Dir

etto

: for

ged

send

er

From

: fri

end@

som

eone

To:

vic

tim@

rela

ydSu

bjec

t: bu

y m

y st

uff

spam

text

...

From

: fri

end@

som

eone

To:

vic

tim@

rela

ydSu

bjec

t: bu

y m

y st

uff

spam

text

...

Inte

rno:

rel

ayd

MT

Afo

rre

layd

Est

erno

: spa

md

Page 32: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

32

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Atta

cco

Dir

etto

: con

side

razi

oni

•I

“filt

ri”

non

funz

iona

no

•L

e vi

ttim

e ce

rcan

o di

far

e re

ply

•A

vol

te il

mitt

ente

e’

un in

diri

zzo

esis

tent

e, m

a de

l tu

tto e

stra

neo

allo

spa

m

•Il

pro

prio

MT

A e

’ in

noce

nte

!

•Id

entif

icar

e qu

ale

MT

A p

erm

ette

rel

ay

•Se

gnal

are

l’in

cide

nte

al C

ER

T

Page 33: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

33

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

SPA

M “

inge

nuo”

•M

itten

te “

vero

” !!

•D

estin

atar

io “

vero

” (l

a vi

ttim

a)

•Il

vos

tro

MT

A e

’ in

noce

nte

!

•M

essa

ggio

“U

nsol

icit

ed C

omm

erci

al E

-mai

l”

(UC

E)

•M

essa

ggio

“C

hain

Let

ter”

(ca

tena

di S

. Ant

onio

)

•Se

gnal

are

l’at

tacc

o al

CE

RT

ed

alla

Nam

ing

Aut

hori

ty I

talia

na a

buse

@na

.nic

.it

Page 34: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

34

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

La

Leg

ge e

lo S

PAM

•T

UT

TO

lo S

PAM

e’

viet

ato

dalla

Net

ique

tte,

obbl

igat

oria

per

i do

min

i del

ccT

LD

“it”

•L

e U

CE

son

o vi

etat

e da

lla le

gge:

DL

185

/99,

ar

ticol

o 10

, con

san

zion

e am

min

istr

ativ

a da

1 a

10

Mili

oni d

i Lir

e

Page 35: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

35

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Iden

tific

are

Sor

gent

i di A

ttac

co

•re

gist

rare

indi

rizz

o IP

hos

t mitt

ente

•re

gist

rare

dic

hiar

azio

ne H

EL

O /

EH

LO

•ve

rifi

care

rev

erse

IP

(PT

R)

host

mitt

ente

•co

nser

vare

i fu

ll he

ader

s (R

ecei

ved,

M

essa

ge-i

d)

•de

pist

aggi

o: m

ail r

outi

ng “

impo

ssib

ili”

Page 36: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

36

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Prot

ezio

ne d

agli

Atta

cchi

: MT

A

•va

luta

refi

ltra

ggio

tota

le p

er in

diri

zzo

IP

•va

luta

refi

ltra

ggio

tota

le p

er d

omin

io (

vero

)

•ev

entu

alm

ente

inse

rim

ento

in b

lack

list

Page 37: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

37

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Prot

egge

re le

LA

N

•su

i rou

ter

perm

ette

re S

OL

O l’

acce

sso

vers

o i m

aile

r in

tern

i pro

tetti

•su

i rou

ter

even

tual

men

tepe

rmet

tere

l’

acce

sso

vers

o l’

este

rno

SO

LO

ai m

aile

r in

tern

i aut

oriz

zati

e p

rote

tti

Page 38: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

38

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Firm

a E

lettr

onic

a: a

uten

ticita

•Fi

rmar

e i m

essa

ggi s

pedi

ti

•ga

ranz

ia s

ull’

iden

tita’

del

mitt

ente

•ga

ranz

ia s

ull’

inte

grita

’ de

l mes

sagg

io

•PG

P: (

uso

“man

uale

”, s

crip

t o p

lug-

in)

-ad

atto

a

grup

pi r

istr

etti

o be

n or

gani

zzat

i di u

tent

i

•S/

MIM

E (

inte

grat

o ne

gli U

A, s

tand

ard)

-ri

chie

de

infr

astr

uttu

ra, s

cala

mol

to b

ene

Page 39: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

39

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Firm

a E

lettr

onic

a: r

iser

vate

zza

•im

pedi

re la

lettu

ra d

ei p

ropr

i mes

sagg

i a te

rzi

•co

esis

tenz

a co

n “a

uten

ticita

’”

•PG

P

•S/

MIM

E

Page 40: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

40

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Vir

us, H

oax

e L

egge

nde

•I

viru

s vi

a m

ail N

ON

esi

ston

o (P

enPa

l gre

etin

gs...

HO

AX

)

•so

lo c

asi e

stre

mam

ente

par

ticol

ari (

bug

in c

erti

UA

/MT

A)

•es

isto

no i

viru

s ne

i FIL

ES

•i f

iles

viag

gian

o co

me

atta

chm

ent..

.

•...

qui

ndi v

ia m

ail a

ttach

men

ts P

OSS

ON

O a

rriv

are

viru

s

•C

ompo

rtar

si c

on g

li a

ttac

hmen

ts c

ome

con

i flo

ppy

scon

osci

uti!

!!

Page 41: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

41

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Vir

us, H

oax

e L

egge

nde

-2

•I

sist

emi a

ntiv

irus

a li

vello

MT

A h

anno

pro

blem

i!

•N

ON

con

figu

rare

gli

UA

per

l’ap

ertu

ra a

utom

atic

a!

•N

ON

ese

guir

e M

AI

un a

ttac

hmen

t: S

alva

rlo,

esa

min

arlo

con

an

tivir

us, e

poi

apr

irlo

!

•N

on m

anda

re m

ai a

d al

tri a

ttach

men

ts r

icev

uti d

a sc

onos

ciut

i!

•...

inso

mm

a us

are

solo

un

po’

di b

uon

sens

o va

le m

olto

piu

’ di

mol

ti fi

ltri c

ompl

essi

!

Page 42: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

42

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Stat

o de

l Sof

twar

e: M

TA

•B

SD S

endm

ail

•M

aile

r Pr

opri

etar

i (N

etsc

ape

Sui

teS

pot,

Qm

ail,.

..)

•A

ltri s

iste

mi o

pera

tivi:

WN

T, M

acO

S,

Ope

nVM

S

Page 43: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

43

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Stat

o B

SD

Sen

dmai

l 8.9

.3

�Fi

ltri a

nti-

spam

via

“FE

AT

UR

E”

�co

ntro

llo v

ia a

cces

s_db

�D

SN

e M

DN

sup

port

ate

�E

SMT

P

�co

ntro

llo v

ia a

lias

es_d

b

Page 44: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

44

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Stat

o M

TA

Pro

prie

tari

�fi

ltri a

nti-

spam

non

sem

pre

adeg

uati

o ef

fici

enti

�co

ntro

llo v

ia a

cces

s lis

t (no

n tu

tti g

li M

TA

)

�su

ppor

to D

SN

, MD

N (

non

sem

pre

corr

etti)

�E

SMT

P

�co

ntro

llo v

ia a

lias

file

s

Page 45: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

45

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Stat

o V

MS

Sen

dmai

l 1.6

d

�fi

ltri a

nti-

spam

(eq

uiva

lent

i a 8

.9.3

)

�co

ntro

llo v

ia a

cces

s_db

�su

ppor

to D

SN

, MD

N (

con

este

nsio

ni)

�E

SMT

P

�co

ntro

llo v

ia s

mtp

_alia

ses.

db

Page 46: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

46

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Stat

o M

TA

per

WN

T, M

acO

S•

alcu

ni b

asat

i su

BS

D s

endm

ail,

ma

spes

so v

ersi

oni

obso

lete

•al

tri t

otal

men

te p

ropr

ieta

ri, m

a no

n as

sicu

rano

le

prot

ezio

ni/f

iltri

nec

essa

rie

•il

ver

o pr

oble

ma

e’ il

sup

port

o te

cnic

o, s

pess

o de

l tu

tto a

ssen

te o

inad

egua

to

•Se

pos

sibi

le N

ON

usa

te q

uest

i sis

tem

i op

erat

ivi p

er M

TA

: meg

lio

linu

x e

BSD

sen

dmai

l

Page 47: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

47

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Stat

o de

l sof

twar

e: U

A

•PI

NE

(da

lla

3.91

in a

vant

i, m

egli

o 4.

x)

•N

etsc

ape

Com

unic

ator

4.x

•M

icro

soft

Out

look

Exp

ress

•E

udor

a Pr

o

•Z

mai

l Pro

•Pe

gasu

s M

ail

Page 48: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

48

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Stat

o di

PIN

E, E

udor

a Pr

o,

Zm

ail,.

..•

non

supp

orta

no s

essi

one

off-

line

•in

terf

acci

a e’

spe

sso

men

o us

er f

rien

dly

•au

tent

icaz

ione

dei

mitt

ente

•m

eno

faci

lita’

con

gli

atta

chm

ent

•m

anca

, a v

olte

, ric

hies

ta D

SN /

MD

N

Page 49: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

49

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Stat

o N

etsc

ape

e O

utlo

ok

•st

essa

API

-->

ste

ssi d

ifet

ti !!

•pr

oble

mi s

incr

oniz

zazi

one

on/o

ff li

ne

•sp

esso

trop

pe f

ines

tre

aper

te in

siem

e

•m

anca

aut

entic

azio

ne d

ei m

itten

ti

•m

anca

, a v

olte

, ric

hies

ta D

SN /

MD

N

•m

olto

use

r fr

iend

ly p

er g

li at

tach

men

t

•co

nfig

uraz

ione

def

ault

tota

lmen

te e

rrat

a

Page 50: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

50

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Stat

o de

l sof

twar

e: M

S

�IM

AP

4rev

1 (p

ubli

c do

mai

n, c

omm

erci

ali)

�PO

P3 (

com

mer

cial

i)

�M

essa

ge S

tore

pro

prie

tari

(co

mm

erci

ali)

Page 51: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

51

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Stat

o de

i Mai

lbox

Ser

ver

•S

erve

r IM

AP

4r1

(Uni

x, V

MS

Mul

tine

t 4.1

b)

•Se

rver

PO

P3 (

Uni

x, V

MS

Mul

tine

t 4.1

b)

Page 52: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

52

Inco

ntri

di G

AR

R-B

Cla

udio

Allo

cchi

o &

Luc

a de

ll’A

gnel

lo

Stat

o de

i Mai

lbox

Ser

ver

•Se

rviz

i acc

esso

PO

P3 e

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Page 63: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

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Page 64: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

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Page 65: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

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Page 66: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

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Page 67: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

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Page 68: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

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Page 69: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

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Page 71: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

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Page 73: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

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Page 74: napoli-mail - cert.garr.it · Title: Microsoft PowerPoint - napoli-mail.ppt Created Date: 2/3/2000 2:04:50 PM

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ent

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form

arla

sul

Hoa

xes

e si

mili

•...

e m

olte

alt

re c

ose!

!