diff mbox

[3/5] gprs: Use RAND_bytes for p-tmsi

Message ID 0ff0e449d3e476466cd8ce7bc46c2720d74f0c46.1444671220.git.dwillmann@sysmocom.de
State Accepted
Headers show

Commit Message

Daniel Willmann Oct. 12, 2015, 5:36 p.m. UTC 
From: Daniel Willmann <dwillmann@sysmocom.de>

[hfreyther: Link to libcrypto, include header, add uint8_t* cast]
---
 openbsc/src/gprs/Makefile.am   | 3 ++-
 openbsc/src/gprs/gprs_sgsn.c   | 6 +++++-
 openbsc/tests/sgsn/Makefile.am | 1 +
 3 files changed, 8 insertions(+), 2 deletions(-)
diff mbox

Patch

diff --git a/openbsc/src/gprs/Makefile.am b/openbsc/src/gprs/Makefile.am
index f46a402..dcc6842 100644
--- a/openbsc/src/gprs/Makefile.am
+++ b/openbsc/src/gprs/Makefile.am
@@ -30,4 +30,5 @@  osmo_sgsn_SOURCES =	gprs_gmm.c gprs_sgsn.c gprs_sndcp.c gprs_sndcp_vty.c \
 			gsm_04_08_gprs.c sgsn_cdr.c sgsn_ares.c
 osmo_sgsn_LDADD = 	\
 			$(top_builddir)/src/libcommon/libcommon.a \
-			-lgtp $(OSMO_LIBS) $(LIBOSMOABIS_LIBS) $(LIBCARES_LIBS) -lrt
+			-lgtp $(OSMO_LIBS) $(LIBOSMOABIS_LIBS) $(LIBCARES_LIBS) \
+			$(LIBCRYPTO_LIBS) -lrt
diff --git a/openbsc/src/gprs/gprs_sgsn.c b/openbsc/src/gprs/gprs_sgsn.c
index f40de0b..9b11c35 100644
--- a/openbsc/src/gprs/gprs_sgsn.c
+++ b/openbsc/src/gprs/gprs_sgsn.c
@@ -41,6 +41,8 @@ 
 
 #include <time.h>
 
+#include <openssl/rand.h>
+
 #define GPRS_LLME_CHECK_TICK 30
 
 extern struct sgsn_instance *sgsn;
@@ -525,7 +527,9 @@  uint32_t sgsn_alloc_ptmsi(void)
 	int max_retries = 100;
 
 restart:
-	ptmsi = rand();
+	if (RAND_bytes((uint8_t *) &ptmsi, sizeof(ptmsi)) != 1)
+		goto failed;
+
 	/* Enforce that the 2 MSB are set without loosing the distance between
 	 * identical values. Since rand() has no duplicate values within a
 	 * period (because the size of the state is the same like the size of
diff --git a/openbsc/tests/sgsn/Makefile.am b/openbsc/tests/sgsn/Makefile.am
index 2782d9e..4c6ba9f 100644
--- a/openbsc/tests/sgsn/Makefile.am
+++ b/openbsc/tests/sgsn/Makefile.am
@@ -35,5 +35,6 @@  sgsn_test_LDADD = \
 	$(LIBOSMOGSM_LIBS) \
 	$(LIBOSMOGB_LIBS) \
 	$(LIBCARES_LIBS) \
+	$(LIBCRYPTO_LIBS) \
 	-lgtp -lrt