diff options
| author | Max <msuraev@sysmocom.de> | 2016-07-06 15:57:01 +0200 |
|---|---|---|
| committer | Harald Welte <laforge@gnumonks.org> | 2016-07-16 21:11:10 +0000 |
| commit | b997f8444313ff7ab99d66b400fc79cae8302166 (patch) | |
| tree | 48b991298a745e79a59d04b7b1b522f91b885ced /openbsc/src/gprs/gprs_llc.c | |
| parent | 5aa5196fbf07d5311bf4d99a90bff303989564f0 (diff) | |
SGSN: add preliminary support for GPRS encryption
It is already functional enough to allow testing with real
phones. However, note - there are several limitations in the current
implementation:
* only default value for IOV-UI is supported at the moment
* AUTN-based key material is not supported
Related: OS#1582
Change-Id: I8900b906693496e4e6b35be5a86937c58039ed9e
Diffstat (limited to 'openbsc/src/gprs/gprs_llc.c')
| -rw-r--r-- | openbsc/src/gprs/gprs_llc.c | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/openbsc/src/gprs/gprs_llc.c b/openbsc/src/gprs/gprs_llc.c index b271e21ca..bc856e98e 100644 --- a/openbsc/src/gprs/gprs_llc.c +++ b/openbsc/src/gprs/gprs_llc.c @@ -22,6 +22,8 @@ #include <errno.h> #include <stdint.h> +#include <openssl/rand.h> + #include <osmocom/core/msgb.h> #include <osmocom/core/linuxlist.h> #include <osmocom/core/timer.h> @@ -598,7 +600,8 @@ int gprs_llc_rcvmsg(struct msgb *msg, struct tlv_parsed *tv) case GPRS_SAPI_SNDCP9: case GPRS_SAPI_SNDCP11: /* Ask an upper layer for help. */ - return sgsn_force_reattach_oldmsg(msg); + return gsm0408_gprs_force_reattach_oldmsg(msg, + lle->llme); default: break; } @@ -769,13 +772,18 @@ int gprs_llgmm_unassign(struct gprs_llc_llme *llme) int gprs_llgmm_reset(struct gprs_llc_llme *llme) { struct msgb *msg = msgb_alloc_headroom(4096, 1024, "LLC_XID"); - int random = rand(); struct gprs_llc_lle *lle = &llme->lle[1]; + if (RAND_bytes((uint8_t *) &llme->iov_ui, 4) != 1) { + LOGP(DLLC, LOGL_NOTICE, "RAND_bytes failed for LLC XID reset, " + "falling back to rand()\n"); + llme->iov_ui = rand(); + } + /* First XID component must be RESET */ msgb_put_xid_par(msg, GPRS_LLC_XID_T_RESET, 0, NULL); /* randomly select new IOV-UI */ - msgb_put_xid_par(msg, GPRS_LLC_XID_T_IOV_UI, 4, (uint8_t *) &random); + msgb_put_xid_par(msg, GPRS_LLC_XID_T_IOV_UI, 4, (uint8_t *) &llme->iov_ui); /* Reset some of the LLC parameters. See GSM 04.64, 8.5.3.1 */ lle->vu_recv = 0; @@ -787,15 +795,21 @@ int gprs_llgmm_reset(struct gprs_llc_llme *llme) return gprs_llc_tx_xid(lle, msg, 1); } -int gprs_llgmm_reset_oldmsg(struct msgb* oldmsg, uint8_t sapi) +int gprs_llgmm_reset_oldmsg(struct msgb* oldmsg, uint8_t sapi, + struct gprs_llc_llme *llme) { struct msgb *msg = msgb_alloc_headroom(4096, 1024, "LLC_XID"); - int random = rand(); + + if (RAND_bytes((uint8_t *) &llme->iov_ui, 4) != 1) { + LOGP(DLLC, LOGL_NOTICE, "RAND_bytes failed for LLC XID reset, " + "falling back to rand()\n"); + llme->iov_ui = rand(); + } /* First XID component must be RESET */ msgb_put_xid_par(msg, GPRS_LLC_XID_T_RESET, 0, NULL); /* randomly select new IOV-UI */ - msgb_put_xid_par(msg, GPRS_LLC_XID_T_IOV_UI, 4, (uint8_t *) &random); + msgb_put_xid_par(msg, GPRS_LLC_XID_T_IOV_UI, 4, (uint8_t *) &llme->iov_ui); /* FIXME: Start T200, wait for XID response */ |