Add cipher cfg param for modem and bts

This parameter is contains a list of supported encryption ciphers by the
modem or bts setting it. It is so far not directly/automatically used
inside osmo-gsm-tester code, but can be useful to create scenarios for
tests that require specific ciphering modes.
For instance, aoip_encryption suite contains tests that require a BTS and
a modem that supports a5 0 and a5 1, otherwise tests will fail.

Change-Id: Ic0e368843a6e58bd3eeef36d2c0a7501296f0f3e

example/default-suites.conf

@@ -6,4 +6,4 @@
 - aoip_sms:trx-sysmocell5000
 - smpp
 - aoip_smpp
-- aoip_encryption
+- aoip_encryption:cipher-a50+cipher-a51

example/resources.conf

@@ -13,6 +13,7 @@ bts:
   ipa_unit_id: 1
   addr: 10.42.42.114
   band: GSM-1800
+  ciphers: [a5_0, a5_1, a5_3]
 
 - label: Ettus B200
   type: osmo-bts-trx
@@ -20,6 +21,7 @@ bts:
   addr: 10.42.42.50
   band: GSM-1800
   launch_trx: true
+  ciphers: [a5_0, a5_1]
 
 - label: sysmoCell 5000
   type: osmo-bts-trx
@@ -27,6 +29,7 @@ bts:
   addr: 10.42.42.51
   band: GSM-1800
   trx_remote_ip: 10.42.42.112
+  ciphers: [a5_0, a5_1]
 
 arfcn:
   - arfcn: 512
@@ -56,21 +59,25 @@ modem:
   imsi: '901700000009031'
   ki: '80A37E6FDEA931EAC92FFA5F671EFEAD'
   auth_algo: 'xor'
+  ciphers: [a5_0, a5_1]
 
 - label: sierra_2
   path: '/sierra_2'
   imsi: '901700000009029'
   ki: '00969E283349D354A8239E877F2E0866'
   auth_algo: 'xor'
+  ciphers: [a5_0, a5_1]
 
 - label: gobi_0
   path: '/gobi_0'
   imsi: '901700000009030'
   ki: 'BB70807226393CDBAC8DD3439FF54252'
   auth_algo: 'xor'
+  ciphers: [a5_0, a5_1]
 
 - label: gobi_3
   path: '/gobi_3'
   imsi: '901700000009032'
   ki: '2F70DCA43C45ACB97E947FDD0C7CA30A'
   auth_algo: 'xor'
+  ciphers: [a5_0, a5_1]

example/scenarios/cipher-a50.conf

@@ -0,0 +1,7 @@
+resources:
+  bts:
+  - ciphers:
+    - a5_0
+  modem:
+  - ciphers:
+    - a5_0

example/scenarios/cipher-a51.conf

@@ -0,0 +1,7 @@
+resources:
+  bts:
+  - ciphers:
+    - a5_1
+  modem:
+  - ciphers:
+    - a5_1

src/osmo_gsm_tester/resource.py

@@ -56,6 +56,7 @@ RESOURCES_SCHEMA = {
         'bts[].band': schema.BAND,
         'bts[].trx_remote_ip': schema.IPV4,
         'bts[].launch_trx': schema.BOOL_STR,
+        'bts[].ciphers[]': schema.CIPHER,
         'bts[].trx_list[].hw_addr': schema.HWADDR,
         'bts[].trx_list[].net_device': schema.STR,
         'bts[].trx_list[].nominal_power': schema.UINT,
@@ -67,6 +68,7 @@ RESOURCES_SCHEMA = {
         'modem[].imsi': schema.IMSI,
         'modem[].ki': schema.KI,
         'modem[].auth_algo': schema.AUTH_ALGO,
+        'modem[].ciphers[]': schema.CIPHER,
     }
 
 WANT_SCHEMA = util.dict_add(

src/osmo_gsm_tester/schema.py

@@ -76,6 +76,11 @@ def times(val):
     if n < 1:
         raise ValueError('Positive value >0 expected instead of %d' % n)
 
+def cipher(val):
+    if val in ('a5_0', 'a5_1', 'a5_2', 'a5_3', 'a5_4', 'a5_5', 'a5_6', 'a5_7'):
+        return
+    raise ValueError('Unknown Cipher value: %r' % val)
+
 INT = 'int'
 STR = 'str'
 UINT = 'uint'
@@ -88,6 +93,7 @@ KI = 'ki'
 MSISDN = 'msisdn'
 AUTH_ALGO = 'auth_algo'
 TIMES='times'
+CIPHER = 'cipher'
 SCHEMA_TYPES = {
         INT: int,
         STR: str,
@@ -101,6 +107,7 @@ SCHEMA_TYPES = {
         MSISDN: msisdn,
         AUTH_ALGO: auth_algo,
         TIMES: times,
+        CIPHER: cipher,
     }
 
 def validate(config, schema):