I have a Lutron Caseta light switch. When I open the iOS app, it connects to lutron.broker.xively.com port 8883. Using a fakedns server I was able to direct that to my server running netcat as follows:
[me@machine :: ~]$ nc -l 8883 | xxd
00000000: 1603 0100 9201 0000 8e03 0358 86b8 87a7 ...........X....
00000010: af0b d067 d7c1 6f69 3f52 aa4a cf58 4c37 ...g..oi?R.J.XL7
00000020: 07cd c9a2 8007 8c12 69d3 f900 002c 00ff ........i....,..
00000030: c02c c02b c024 c023 c00a c009 c008 c030 .,.+.$.#.......0
00000040: c02f c028 c027 c014 c013 c012 009d 009c ./.(.'..........
00000050: 003d 003c 0035 002f 000a 0100 0039 000a .=.<.5./.....9..
00000060: 0008 0006 0017 0018 0019 000b 0002 0100 ................
00000070: 000d 0012 0010 0401 0201 0501 0601 0403 ................
00000080: 0203 0503 0603 0005 0005 0100 0000 0000 ................
00000090: 1200 0000 1700 00 .......
when i reconnect to the real broker server and send this data, it sends back the following:
00000000: 1603 0300 5d02 0000 5903 0390 1ed9 de85 ....]...Y.......
00000010: b5a0 1d4b 1c85 7cb5 da8a efc9 9ce5 8277 ...K..|........w
00000020: 7592 cefb 27af 9b87 384c 8820 6f33 e681 u...'...8L. o3..
00000030: 2e81 f8ca 1036 a881 e640 8bdf 7c8e 0cfa .....6...@..|...
00000040: 0ed6 041f 776c 0146 d996 86f0 c030 0000 ....wl.F.....0..
00000050: 11ff 0100 0100 000b 0004 0300 0102 0005 ................
00000060: 0000 1603 0309 f40b 0009 f000 09ed 0005 ................
00000070: 7a30 8205 7630 8204 5ea0 0302 0102 0212 z0..v0..^.......
00000080: 1121 e3ea e36b 0b95 9481 0331 f573 e072 .!...k.....1.s.r
00000090: 66c3 300d 0609 2a86 4886 f70d 0101 0b05 f.0...*.H.......
000000a0: 0030 6631 0b30 0906 0355 0406 1302 4245 .0f1.0...U....BE
000000b0: 3119 3017 0603 5504 0a13 1047 6c6f 6261 1.0...U....Globa
000000c0: 6c53 6967 6e20 6e76 2d73 6131 3c30 3a06 lSign nv-sa1<0:.
000000d0: 0355 0403 1333 476c 6f62 616c 5369 676e .U...3GlobalSign
000000e0: 204f 7267 616e 697a 6174 696f 6e20 5661 Organization Va
000000f0: 6c69 6461 7469 6f6e 2043 4120 2d20 5348 lidation CA - SH
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00000110: 3331 3831 3831 3130 365a 170d 3137 3033 318181106Z..1703
00000120: 3139 3138 3131 3036 5a30 6c31 0b30 0906 19181106Z0l1.0..
00000130: 0355 0406 1302 5553 3116 3014 0603 5504 .U....US1.0...U.
00000140: 0813 0d4d 6173 7361 6368 7573 6574 7473 ...Massachusetts
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000001b0: 8201 0a02 8201 0100 e51b 84f4 c890 c8e5 ................
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000002e0: 303e 0606 6781 0c01 0202 3034 3032 0608 0>..g.....0402..
000002f0: 2b06 0105 0507 0201 1626 6874 7470 733a +........&https:
00000300: 2f2f 7777 772e 676c 6f62 616c 7369 676e //www.globalsign
00000310: 2e63 6f6d 2f72 6570 6f73 6974 6f72 792f .com/repository/
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000004b0: 1bd9 2fd0 5f77 301f 0603 551d 2304 1830 ../._w0...U.#..0
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00000630: 1047 6c6f 6261 6c53 6967 6e20 6e76 2d73 .GlobalSign nv-s
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00000690: 3066 310b 3009 0603 5504 0613 0242 4531 0f1.0...U....BE1
000006a0: 1930 1706 0355 040a 1310 476c 6f62 616c .0...U....Global
000006b0: 5369 676e 206e 762d 7361 313c 303a 0603 Sign nv-sa1<0:..
000006c0: 5504 0313 3347 6c6f 6261 6c53 6967 6e20 U...3GlobalSign
000006d0: 4f72 6761 6e69 7a61 7469 6f6e 2056 616c Organization Val
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00000a50: f40c 870c f4ac 40f8 5949 9816 0303 0630 [email protected]
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00000e40: dcb9 fe06 3132 5516 2944 d145 286c 6451 ....12U.)D.E(ldQ
00000e50: ea0d 8736 37cd 1040 aa9d 1d1c fdc7 6cf0 [email protected].
00000e60: 9419 419e 3e6c e9f3 bdbc ddf4 6d05 d465 ..A.>l......m..e
00000e70: 3bd8 b193 80b7 6ef6 7e90 9057 6281 3fa2 ;.....n.~..Wb.?.
00000e80: 8b67 45d5 8cb8 9098 b9b3 61e0 4b4d f946 .gE.......a.KM.F
00000e90: ce13 827d 8171 6f3b 53e5 041c 602f d612 ...}.qo;S...`/..
00000ea0: 7392 98eb 9636 1cf7 8da1 47eb 6102 0301 s....6....G.a...
00000eb0: 0001 a381 c730 81c4 301d 0603 551d 0e04 .....0..0...U...
00000ec0: 1604 149c 4d00 9900 0e8b b001 8175 a1ba ....M........u..
00000ed0: f0d0 25d7 a01c 4730 1f06 0355 1d23 0418 ..%...G0...U.#..
00000ee0: 3016 8014 96de 61f1 bd1c 1629 531c c0cc 0.....a....)S...
00000ef0: 7d3b 8300 40e6 1a7c 300f 0609 2b06 0105 };..@..|0...+...
00000f00: 0507 3001 0504 0205 0030 4c06 0355 1d20 ..0......0L..U.
00000f10: 0445 3043 3041 0609 2b06 0104 01a0 3201 .E0C0A..+.....2.
00000f20: 5f30 3430 3206 082b 0601 0505 0702 0116 _0402..+........
00000f30: 2668 7474 7073 3a2f 2f77 7777 2e67 6c6f &https://www.glo
00000f40: 6261 6c73 6967 6e2e 636f 6d2f 7265 706f balsign.com/repo
00000f50: 7369 746f 7279 2f30 0e06 0355 1d0f 0101 sitory/0...U....
00000f60: ff04 0403 0207 8030 1306 0355 1d25 040c .......0...U.%..
00000f70: 300a 0608 2b06 0105 0507 0309 300d 0609 0...+.......0...
00000f80: 2a86 4886 f70d 0101 0b05 0003 8201 0100 *.H.............
00000f90: 0d48 1109 b018 b243 8049 65e3 8cdb cb3b .H.....C.Ie....;
00000fa0: 1379 4e19 27cc ddd2 e72f 3fad 54b2 152d .yN.'..../?.T..-
00000fb0: 549f 6185 cd34 ae82 0a6e e3f7 4f57 2f6c T.a..4...n..OW/l
00000fc0: 96ee cdc0 5b7c 0efc 2dee 6983 fd2f 8627 ....[|..-.i../.'
00000fd0: 9bde 3195 220b 16eb 808a 8133 5bfd 9cd7 ..1."......3[...
00000fe0: 4a1e 9ce9 afde 5c40 ae53 a23d 2d70 b3d3 J.....\@.S.=-p..
00000ff0: 7081 ac0c e6d3 ba64 81b5 963e 7e4a e87c p......d...>~J.|
00001000: 4530 7988 b6e3 a08b ef21 963b a763 8e2c E0y......!.;.c.,
00001010: 8489 e67c 7c06 56f4 8b98 174b d092 4ce6 ...||.V....K..L.
00001020: f28b 6458 7fb7 c661 d1ba bd9d 3627 0ae4 ..dX...a....6'..
00001030: 55fd df47 ceee c911 413b e88b 98ea cb8e U..G....A;......
00001040: 1cf8 fa00 344b 9306 f11f e796 c1a3 7fcc ....4K..........
00001050: cd6b d742 5dbd 730b 33bd eac9 240e 0b43 .k.B].s.3...$..C
00001060: 7281 998a a654 192a 7a00 a5be 7717 0b24 r....T.*z...w..$
00001070: 97e2 78d7 f533 be87 b34b d0e7 9682 314a ..x..3...K....1J
00001080: 8532 a4ce c745 3973 984c 2e08 1aa9 bf4f .2...E9s.L.....O
00001090: 1603 0301 4d0c 0001 4903 0017 4104 e7ba ....M...I...A...
000010a0: 5507 82b0 b4ea 0619 d41d 5d90 14d0 8cd3 U.........].....
000010b0: 5f8f 8033 33fc cae8 26dc 9adb 7885 74d2 _..33...&...x.t.
000010c0: 9214 7707 3a8e 46c4 ce1c 6cc5 b323 cb0e ..w.:.F...l..#..
000010d0: c07c abb1 4f3f a032 74b4 3455 3eb2 0601 .|..O?.2t.4U>...
000010e0: 0100 21a0 f265 b0d6 fe2b 93d5 06ba fcd4 ..!..e...+......
000010f0: 10ea e7ba 362c 5619 c154 535a bcf1 a9ba ....6,V..TSZ....
00001100: ec18 6ab9 bc72 32d8 5862 9e35 524b b2e8 ..j..r2.Xb.5RK..
00001110: d7ac 522c 1341 4177 0373 e734 ba8c 7907 ..R,.AAw.s.4..y.
00001120: 0650 4096 968a 415e 7284 4a3d ac21 0a6c [email protected]^r.J=.!.l
00001130: 6bf4 e7d7 c4c6 8c64 b37c e215 c606 18cb k......d.|......
00001140: fb33 00ba eecd 8916 cfb3 eb5a 12a9 d6b2 .3.........Z....
00001150: 4e49 38da 0ec2 8ef0 9b8e fb75 b1e3 95a4 NI8........u....
00001160: d021 5825 378c 14a3 aec7 3cff 4d5a be14 .!X%7.....<.MZ..
00001170: a320 c0ee f7b8 9d81 15e3 6a11 700c 08c2 . ........j.p...
00001180: ffbe e477 ce41 ad28 373d 5d34 0f60 186d ...w.A.(7=]4.`.m
00001190: 8f42 bca5 e8c7 a388 0e09 ba13 7d1c b90b .B..........}...
000011a0: a5cf f39c 1d1d 0b5e 3176 e7ba 4136 f3df .......^1v..A6..
000011b0: 963b 6aad 0061 19c7 ae44 015a 6ee4 56bc .;j..a...D.Zn.V.
000011c0: 9dbe 394f 5c16 27b0 7b9d 983d 5133 8403 ..9O\.'.{..=Q3..
000011d0: bf01 fec3 e2f6 20af ab4e 1cda 0d42 1a8e ...... ..N...B..
000011e0: 242d 1603 0300 040e 0000 00 $-.........
I tried to send this thru mitmproxy but it only says Cannot validate certificate hostname without SNI. Which I presume means something in regards to certificate pinning.
Any ideas on further reversing this encrypted (SSL?) connection?
Edit: added xxd binary instead of copy/paste garbage as commented below.
