I'm trying to communicate with a server that uses SSL/TLS but has some limited cipher suites.
How can I get a list of supported cipher suites in my sim800c to see if it can communicate with the server?
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Abol_Fa
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Do you have a test server that you can use to test your connection attempts? Better if it is an OpenSSL server. – Roberto Caboni Dec 21 '19 at 19:34
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unfortunately no. – Abol_Fa Dec 22 '19 at 05:20
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B plan. Do you have administrator rights in a PC/Workstation with a public IP address? – Roberto Caboni Dec 22 '19 at 07:21
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no, but i can rent a cheap VPS for testing purposes. – Abol_Fa Dec 23 '19 at 12:55
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The goal is connecting to your server with your modem with a sniffer such as Wireshark on server side. In fact the first handshake message, the *Hello message*, contains the list of supported cipher suites supported by it. – Roberto Caboni Dec 23 '19 at 13:42
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It doesn't need to be a ssl server. You can understan it also with a tcp listening socket. Even with another modem, if you are able to set it in listening. – Roberto Caboni Dec 23 '19 at 13:46
2 Answers
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I created the test environment that @roberto-caboni suggested. I tested with both SIM800L and SIM800C. Cipher suites are the same.
The results are:
/* SIM800L firmware revision */
AT+CGMR
Revision:1418B05SIM800L24
OK
/* SIM800C firmware revision */
AT+CGMR
Revision:1418B08SIM800C24_BT
OK
/* I wiresharked a SLL connection to my server, the results:
Cipher Suites (9 suites)
Cipher Suite: TLS_RSA_WITH_RC4_128_MD5 (0x0004)
Cipher Suite: TLS_RSA_WITH_RC4_128_SHA (0x0005)
Cipher Suite: TLS_RSA_WITH_AES_128_CBC_SHA (0x002f)
Cipher Suite: TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA (0x0016)
Cipher Suite: TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA (0x0013)
Cipher Suite: TLS_RSA_WITH_3DES_EDE_CBC_SHA (0x000a)
Cipher Suite: TLS_RSA_WITH_DES_CBC_SHA (0x0009)
Cipher Suite: TLS_RSA_EXPORT_WITH_RC4_40_MD5 (0x0003)
Cipher Suite: TLS_DHE_DSS_WITH_DES_CBC_SHA (0x0012)
*/
Systick Timer
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0
Revision: 1418B09SIM800C24_TLS
Cipher Suites (10 suites)
Cipher Suite: TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 (0xc02b)
Cipher Suite: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (0xc02f)
Cipher Suite: TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 (0xc023)
Cipher Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 (0xc027)
Cipher Suite: TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA (0xc009)
Cipher Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (0xc013)
Cipher Suite: TLS_RSA_WITH_AES_128_GCM_SHA256 (0x009c)
Cipher Suite: TLS_RSA_WITH_AES_128_CBC_SHA256 (0x003c)
Cipher Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (0xc014)
Cipher Suite: TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA (0xc00a)
Piotr Perzyna
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