Security. Guevara Noubir Network Security Northeastern University
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1 Guevara Noubir Network Security Northeastern University 1
2 One of the most widely used applica>ons of the Internet but s>ll rela>vely insecure Designed without security concerns How does work? How to provide important security services Confiden>ality, authen>ca>on, integrity, etc. Spam resiliency 2
3 How Works Architecture Mail User Agent (MUA): client Mail Sending Agent (MSA): server on sender side Mail Transfer Agent (MTA): server on sender/recipient side Mail Delivery Agent (MDA): responsible for deliver to recipient s MUA Opera>on Client submits message MUA < > MSA telnet mail.ccs.neu.edu 25! MSA sends message to MTA ; forwarded to recipient MTA Recipient MTA found through DNS system ccs.neu.edu MX) MUA retrieves using POP3 or IMAP protocols 3
4 Security Services: Issues & Solu>ons Confiden>ality Traffic not encrypted can be redirected and intercepted (See MITM lab) Authen>ca>on/Integrity Messages can be fabricated, modified, trust in DNS system Addi>onal services: Non- repudia>on, proof of submission, proof of delivery, anonymity, message flow confiden>ality Layer: SSL/TLS between sender client/local server/des>na>on server/recipient Layer: end- to- end confiden>ality and integrity protec>on Authen>ca>on of sending user vs. authen>ca>on of sending mail transfer agent Examples: PGP, S/MIME, DKIM Implica>ons? 4
5 End- to- End Confiden>ality With symmetric keys With asymmetric keys (public key cryptography) Single des>na>on, mul>ple des>na>ons, mailing lists 5
6 End- to- end Authen>ca>on/Integrity With symmetric keys With asymmetric keys (public key cryptography) 6
7 Addi>onal Security Services Non- repudia>on With asymmetric keys (public key cryptography) With and without plausible deniability Proof of submission With coopera>on of MSA/MTA (stronger than regular mail service) Proof of delivery Requires coopera>on of recipient Not possible to provide a receipt if and only if recipient got the message Anonymity Mixing? easier solu>ons today 7
8 PEM, S/MIME, PGP PEM, S/MIME PGP allow addi>onal security services Privacy Enhanced Mail (RFC ) Provides a way to integrate confiden>ality, authen>ca>on/integrity services within mail system Not used much today because of CA, evolved into S/MIME PEM message -----BEGIN PRIVACY-ENHANCED MESSAGE END PRIVACY-ENHANCED MESSAGE----- Types of data ordinary, unsecured integrity- protected, unmodified (MIC- CLEAR) integrity- protected, encoded (MIC- ONLY) encrypted, integrity- protected, encoded (ENCRYPTED) Single root cer>fica>on authority 8
9 Secure/Mul>purpose Internet Mail Extension MIME specifies a standard way of encoding arbitrary data in (e.g., picture ajachments) S/MIME specifies the security related header Incorporated into MIME => no addi>onal encoding Any sequence of sign & encrypt is supported Each as a recursive MIME encapsula>on Has more op>ons than PEM ASN.1 header encoding No prescribed cer>fica>on hierarchy Has a good prospect of deployment for commercial & organiza>onal usage 9
10 Prejy Good Privacy (PGP) Similar to S/MIME with a more complex history Major difference: web of trust graph Par>al trust, mul>ple paths Issues In theory would be safer than PEM Difficult to operate in prac>ce 10
11 Spam For years spam has been a major problem of Es>mated to be 94% of s From a nuisance to a threat How? Harves>ng/buying addresses Sending through open relays, proxies, crea>ng webmail accounts (circumven>ng CAPTCHAs), malware, spambots, hijacking IP blocks Why? Spam economics Even with a currently es>mated conversion rate of 10-7 s>ll interes>ng 11
12 An>- Spam Current solu>ons: Black/white lis>ng IP addresses (e.g., zombie computers, addresses that sent spam to honeypots, ISP willingly hos>ng spammers) Signatures/content matching rules HashCash: add header X- Hashcash: Distributed Checksum Clearinghouse: message fuzzy checksum is sent to DCC to check how many >mes it appeared Sender Policy Framework: specify who can send from a domain (relies on TXT/SPF DNS record) neu.edu ANY Example of sosware combining these techniques: spamassassin 12
13 Sending MTA Authen>ca>on DomainKeys Iden>fied Mail (DKIM RFC 4871, 2007) DomainKeys ini>ated by Yahoo!, today a IETF standard DKIM The sending MTA adds a signature to the message MIME header Public key can be retrieved through DNS system s1024._domainkey.yahoo.com any gamma._domainkey.gmail.com any Example: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;! d=gmail.com; s=gamma;! h=domainkey-signature:mime-version:received:received:date:message-id! :subject:from:to:content-type;! bh=cvc34odypb/uehubbdqqmwxzfqzbogjw5gpy4w6duze=;! b=asseletxcmm/x3al38efnvi9xdrbdleaabqd24f7xs49przhxk/7vak9+lyllcn89e! GZ7SZi7swY2xIlt3zJTiGrGif0bfQdf7LvlP12g53nczhBBRa8McBVtdK9+ImAZByg8o! oem4innjmvdhxi9mvxtntkvmstmwitajxzgqq=! DomainKey-Signature: a=rsa-sha1; c=nofws;! d=gmail.com; s=gamma;! h=mime-version:date:message-id:subject:from:to:content-type;! b=jfwie0ylmwxu+sq4oj9ef5k3rjbzq51dgeyafyvkjyr8nkogrnopiuq5f29ld8p0ad! Lg058evTVeuWxvfPQfa7K65J9AjEQt5U8d9zBKFfxRAz1h5nr7k2kCLRMnhbqVTkiOIS! OUfxIQeMfgbYz0ydCgerEnfGreKMQIYax+dpo=! 13
14 Summary applica>on was designed, and deployed without security in mind over an insecure Internet not well understood threats Several security services have been proposed with varying levels of acceptance Transport layer security Applica>on level security End- to- end, MTA authen>ca>on, etc. S>ll vulnerable e.g., DNS poisoning 14
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