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-rw-r--r--lib/diameter/src/base/diameter_capx.erl19
-rw-r--r--lib/diameter/src/base/diameter_peer_fsm.erl7
2 files changed, 24 insertions, 2 deletions
diff --git a/lib/diameter/src/base/diameter_capx.erl b/lib/diameter/src/base/diameter_capx.erl
index 9a443fead0..4b821f5139 100644
--- a/lib/diameter/src/base/diameter_capx.erl
+++ b/lib/diameter/src/base/diameter_capx.erl
@@ -282,9 +282,26 @@ build_CEA(_, LCaps, RCaps, Dict, CEA) ->
[] ->
Dict:'#set-'({'Result-Code', ?NOSECURITY}, CEA);
[_] = IS ->
- Dict:'#set-'({'Inband-Security-Id', IS}, CEA)
+ Dict:'#set-'({'Inband-Security-Id', inband_security(IS)}, CEA)
end.
+%% Only set Inband-Security-Id if different from the default, since
+%% RFC 6733 recommends against the AVP:
+%%
+%% 6.10. Inband-Security-Id AVP
+%%
+%% The Inband-Security-Id AVP (AVP Code 299) is of type Unsigned32 and
+%% is used in order to advertise support of the security portion of the
+%% application. The use of this AVP in CER and CEA messages is NOT
+%% RECOMMENDED. Instead, discovery of a Diameter entity's security
+%% capabilities can be done either through static configuration or via
+%% Diameter Peer Discovery as described in Section 5.2.
+
+inband_security([?NO_INBAND_SECURITY]) ->
+ [];
+inband_security([_] = IS) ->
+ IS.
+
%% common_security/2
common_security(#diameter_caps{inband_security_id = LS},
diff --git a/lib/diameter/src/base/diameter_peer_fsm.erl b/lib/diameter/src/base/diameter_peer_fsm.erl
index 6be4259510..d9db630ec0 100644
--- a/lib/diameter/src/base/diameter_peer_fsm.erl
+++ b/lib/diameter/src/base/diameter_peer_fsm.erl
@@ -702,7 +702,7 @@ build_answer('CER',
N -> {cea(CEA, N, Dict0), [fun open/5, Pkt,
SupportedApps,
Caps,
- {accept, hd([_] = IS)}]}
+ {accept, inband_security(IS)}]}
catch
?FAILURE(Reason) ->
rejected(Reason, {'CER', Reason, Caps, Pkt}, S)
@@ -719,6 +719,11 @@ build_answer(Type,
RC = rc(H, Es),
{answer(Type, RC, Es, S), post(Type, RC, Pkt, S)}.
+inband_security([]) ->
+ ?NO_INBAND_SECURITY;
+inband_security([IS]) ->
+ IS.
+
cea(CEA, ok, _) ->
CEA;
cea(CEA, 2001, _) ->