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1 Secure Sockets Layer (SSL, ) I Transport Layer Security _ + (TLS) Network Security Products S31213
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6 UNCLASSIFIED Location of SSL -L Protocols TCP Ethernet IP SSL Header Encrypted SSL data= HTTP " Independent of packet boundaries " Multiple SSL records can be sent per packet " SSL records can span packets UNCLASSIFIED
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10 UNCLASSIFIED Public Key Algorithms -+-; Key Exchange used to derive session keys for encryption: RSA Diffie-Hellman (DH I EDH I ADH) Elliptic Curve Diffie-Hellman (ECDH I ECDHE) Pre-Shared Key (PSK) Secure Remote Password (SRP) Fortezza Kerberos ~ Authentication mechanisms RSA DSA None (Anonymous) UNCLASSIFIED
11 UNCLASSIFIED Symmetric Key Algorithms +~ Work horse of algorithms ~ Can offer near perfect secrecy ~ Block - encrypt data block RC2-128 bit key DES - 56 bit key or Triple DES IDEA- 128 bit key, PGP AES or 256 bit key SEED bit key CAMELLIA- 128 or 256 bit key ~ Stream - encrypt byte by byte RC4-128 bit key UNCLASSIFIED
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17 SECRET//COMINT// Client Hello - Version I + 3(fLS SSL 3/TLS handshake. Version Message length Client hello message Length Version Client Hello Random Session ID length Session ID Cipher suite length Cipher suites Compression length Compression methods <1 byte> <2 bytes> <2 bytes> <1 byte = <3 bytes> <2 bytes <32 bytes> 81> <1 byte - usually 8x28 or 8> If present, resumed session <2 bytes> <Set of 2 byte cipher suites> <1 byte> SECRET//COMINT//
18 SECRET//COMINT// Server Hello- Version ' + 3/TLS SSL 3/TLS message Version Length Server hello message Length Version Server hello random <1 byte - <2 bytes> <2 bytes> <1 byte - <3 bytes> <2 bytes> <32 bytes> 8x16> 8x82> Session ID length Session ID Cipher selected Compression <1 byte - usually 8x28> <2 byte cipher suite> <1 byte> SECRET//COMINT//
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20 SECRETIICOMINTII Sample Parsed Certificate + Certificate: Data: Version: 1 (OxO) Serial Number: f4: bf: 15:eb:73:ef:e2: 16 Signature Algorithm: sha1 WithRSAEncryption Issuer: C=CA, ST=server-ca-state, L=server-ca-city, O=server-ca-company, OU =server-ca-section, CN=server-ca-name/ [email protected] Validity Not Before: Apr 24 21:07: GMT Not After: May 24 21:07: GMT Subject: C=SE, ST=server-state, L=server-city, O=server-company, OU=server-section, CN=servername/ [email protected] SECRET I IC OMINT I
21 SECRETIICOMINTII ' Certificate (con't) Subj, ct Public Key Info: Public Key Algorithm: rsaencryption RSA Public Key: (1024 bit) Modulus (1024 bit): OO:ad:e3:64:3f:45:75:44:be:b8:5f:ab:74:35:e0:12:ef:2f:41:23:ca:10:96:2e:e3:1a:48:da:c4:ef: 8d:ca:67:d9:11:8a:9f:45:6c:f2:7c:e9:cb:fd:51:9b:Sd:Ob:02:1b:9d:fa:9c:28:ae:8c:ef:43:eb:cc: 7e:50:27:52:2d:af:28:7c:89:c5:37:43:01:f8:e5:98:03:9d:fe:dc:d2:ba:74:84:86:be:6f:f6:93:c6: 5a:15:36:85:11:9e:24:f1:cO:c7:e8:05:d1:91:86:7f:Od:58:be:f8:80:8b:1a:fO:Ob:f5:0d:28:10:1e: b1:fe:9f:61:9b:27: 15:06:b7 Exponent: 65537(0x10001) Signature Algorithm: sha1 WithRSAEncryption 05:5e:a6:5a:eb:9c:ab:f6:2e:67:b2:7e:91:45:40:47:56:3d:76:5b:9a:d2:82:63:16:9a:d1:5a:4d:a0: 87:ed:2e:98:2a1a:4e:d9:04:bb:bO:b6:28:f6:a3:0b:f9:74:6f:c2:e1:dd:98:08:63:ff:2d:53:c5:b7:7c: a8:c7:66:ea:6a:1a:cc:f9:4b:52:b1:bd:60:5e:d7:8c:aa:82:01:09:ef:15:d9:3a:98:45:0d:f1:9a:2c:be: 07:db:72:4c:b9:a2:90:c1:d1:06:fd:81:76:19:c5:4d:bf:30:df:81:c5:22:6b:Se:09:3f:9e:bc:b8:67:d5: 12:bb:24:da:7d SECRET I IC OMINT I
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24 Hash function Decipher with public key
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27 SECRETIICOMINTII , Master Secret ~ Master secret is same across a session/resumed session. i ~ Used for generating encryption keys, MAC secrets and IV s. ~ Formed differently for SSL and TLS, but both use a combination of: SHAl MDS Client Random Server Random Pre-Master Secret Fixed Constant ( eg, "A" "client write key") SECRET I IC OMINT I
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30 SECRET//COMINT//REL TO USA, FVEY// Session Keys "*ro~ the Key Block, pull out the keys as follows: Client Write MAC Secret Server Write MAC Secret Client Write Key Server Write Key Client Write IV Server Write IV (Hash size bytes) (Hash size bytes) (Key Material Length) (Key Material Length) (IV Size) (IV Size) Example: 3DES_EDE_CBC_SHA 2 x 24 byte keys, 2 x 20 byte MAC secrets,2 x 8 byte IVs = 104 bytes of key SECRET//COMINT//REL TO USA, FVEY//
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33 TOP SECRET//COMINT//REL TO USA, FVEY. SSL Exploitation + ~ Not impossible! ' ~ RSA key exchange ''easy'' to do because of fixed key. ~ EDH key exchange not exploitable by the "easy" way. TOP SECRET//COMINT//REL TO USA, FVEY
34 UN CLASSIFIED RSA Keys (Stating the + Obvious) If the Key Exchange type is RSA: ~ If we can get a hold of the server's RSA private key, we can decrypt the Client Key Exchange message and read the premaster secret key. No other heavy work need be done. ~ Valid for life of certificate UN CLASSIFIED
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36 TOP SECRET//COMINT//REL TO USA, FVEY RSA Exploitation Steps +~ Is it the key exchange RSA? (server hello) ~If so, is the modulus match a known private key? (server certificate) ~ If so, is there 2 -sided collect? ~If so, do we have: ~ Client Hello ~ Server Hello ~ Client Key Exchange DECRYPTION! TOP SECRET//COMINT//REL TO USA, FVEY
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38 CONFIDENTIAL//COMINT Problems in + p_rocess1ng ' ~ Literally millions of sessions per day ~ Need to have good filtering and selection ~ Need both sides of conversation ~ USSID 18 issues CONFIDENTIAL//COMINT
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Secure Sockets Layer (SSL ) / Transport Layer Security (TLS) Network Security Products S31213
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