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UMTS AKA: implement SQN increment according to SEQ and IND

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Add ind_bitlen column to auc_3g to record each USIM's IND size according to
3GPP TS 33.102 -- default is 5 bits, as suggested by the spec.

Introduce auc_3g_ind to each connecting GSUP client to use as IND index for
generating auth tuples sent to this client.

With osmo_gsup_server_add_conn(), implement a scheme where clients receive
fixed auc_3g_ind indexes based on the order in which they connect; each new
connection takes the lowest unused auc_3g_ind, so in case one of the clients
restarts, it will most likely receive the same auc_3g_ind, and if one client
disconnects, no other clients' auc_3g_ind are affected.

Add gsup_server_test.c to test the auc_3g_ind index distribution scheme.

Depends: libosmocore I4eac5be0c0b2cede04464c4c3a0873102d952453 for llist_first
Related: OS#1969
Change-Id: If4501ed4ff8e923fa6fe8b80c44c5ad647a8ed60
This commit is contained in:
Neels Hofmeyr
2017-03-15 00:07:43 +01:00
parent ee392bb3b1
commit cab2fcd5b5
15 changed files with 354 additions and 12 deletions
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sql/hlr.sql
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@@ -63,7 +63,8 @@ CREATE TABLE auc_3g (
k VARCHAR(32) NOT NULL, -- hex string: subscriber's secret key (128bit)
op VARCHAR(32), -- hex string: operator's secret key (128bit)
opc VARCHAR(32), -- hex string: derived from OP and K (128bit)
sqn INTEGER NOT NULL DEFAULT 0 -- sequence number of key usage
sqn INTEGER NOT NULL DEFAULT 0, -- sequence number of key usage
ind_bitlen INTEGER NOT NULL DEFAULT 5 -- nr of index bits at lower SQN end
);
CREATE UNIQUE INDEX IF NOT EXISTS idx_subscr_imsi ON subscriber (imsi);