[snmp/manager] Incorrect use of EngineBoots and EngineTime when encrypting

When performing the AES encryption, invalid values for the
EngineBoots and EngineTime was used. The values of the local
agent was used, which would have produced some values if an
agent was actually running. If not it would have caused a crash.

OTP-11413

4 files changed, 24 insertions, 12 deletions

diff --git a/lib/snmp/src/agent/snmpa_mpd.erl b/lib/snmp/src/agent/snmpa_mpd.erl
index 2d37ea56f0..11ae806866 100644
--- a/lib/snmp/src/agent/snmpa_mpd.erl
+++ b/lib/snmp/src/agent/snmpa_mpd.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 1997-2012. All Rights Reserved.
+%% Copyright Ericsson AB 1997-2013. All Rights Reserved.
 %%
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
@@ -657,7 +657,7 @@ generate_response_msg(Vsn, RePdu, Type,
 		    ?SEC_USM ->
 			snmpa_usm
 		end,
-	    SecEngineID = LocalEngineID, 
+	    SecEngineID = LocalEngineID, % 3.1.1a
 	    ?vtrace("generate_response_msg -> SecEngineID: ~w", [SecEngineID]),
 	    case (catch SecModule:generate_outgoing_msg(Message, 
 							SecEngineID,
diff --git a/lib/snmp/src/agent/snmpa_usm.erl b/lib/snmp/src/agent/snmpa_usm.erl
index 6f54307f9f..719ea4e356 100644
--- a/lib/snmp/src/agent/snmpa_usm.erl
+++ b/lib/snmp/src/agent/snmpa_usm.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 1999-2011. All Rights Reserved.
+%% Copyright Ericsson AB 1999-2013. All Rights Reserved.
 %%
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
@@ -16,6 +16,9 @@
 %%
 %% %CopyrightEnd%
 %%
+%% AES: RFC 3826
+%% 
+
 -module(snmpa_usm).
 
 %% Avoid warning for local function error/1 clashing with autoimported BIF.
@@ -652,7 +655,10 @@ get_des_salt() ->
     [?i32(EngineBoots), ?i32(SaltInt)].
 
 aes_encrypt(PrivKey, Data) ->
-    snmp_usm:aes_encrypt(PrivKey, Data, fun get_aes_salt/0).
+    EngineBoots = snmp_framework_mib:get_engine_boots(),
+    EngineTime  = snmp_framework_mib:get_engine_time(),
+    snmp_usm:aes_encrypt(PrivKey, Data, fun get_aes_salt/0, 
+			 EngineBoots, EngineTime).
 
 aes_decrypt(PrivKey, UsmSecParams, EncData) ->
     #usmSecurityParameters{msgPrivacyParameters        = PrivParams,
diff --git a/lib/snmp/src/manager/snmpm_usm.erl b/lib/snmp/src/manager/snmpm_usm.erl
index 497d6d6102..0a8a6436a3 100644
--- a/lib/snmp/src/manager/snmpm_usm.erl
+++ b/lib/snmp/src/manager/snmpm_usm.erl
@@ -1,7 +1,7 @@
 %% 
 %% %CopyrightBegin%
 %% 
-%% Copyright Ericsson AB 2004-2011. All Rights Reserved.
+%% Copyright Ericsson AB 2004-2013. All Rights Reserved.
 %% 
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
@@ -19,6 +19,9 @@
 %%-----------------------------------------------------------------
 %% This module implements the User Based Security Model for SNMP,
 %% as defined in rfc2274.
+%% 
+%% AES: RFC 3826
+%% 
 %%-----------------------------------------------------------------
 
 -module(snmpm_usm).
@@ -416,11 +419,14 @@ get_des_salt() ->
     [?i32(EngineBoots), ?i32(SaltInt)].
 
 aes_encrypt(PrivKey, Data) ->
-    snmp_usm:aes_encrypt(PrivKey, Data, fun get_aes_salt/0).
+    EngineBoots = get_engine_boots(), 
+    EngineTime  = get_engine_time(), 
+    snmp_usm:aes_encrypt(PrivKey, Data, fun get_aes_salt/0, 
+			 EngineBoots, EngineTime).
 
 aes_decrypt(PrivKey, UsmSecParams, EncData) ->
-    #usmSecurityParameters{msgPrivacyParameters = MsgPrivParams,
-			   msgAuthoritativeEngineTime = EngineTime,
+    #usmSecurityParameters{msgPrivacyParameters        = MsgPrivParams,
+			   msgAuthoritativeEngineTime  = EngineTime,
 			   msgAuthoritativeEngineBoots = EngineBoots} =
 	UsmSecParams,
     snmp_usm:aes_decrypt(PrivKey, MsgPrivParams, EncData, 
diff --git a/lib/snmp/src/misc/snmp_usm.erl b/lib/snmp/src/misc/snmp_usm.erl
index 0c57f535cd..32198deb8b 100644
--- a/lib/snmp/src/misc/snmp_usm.erl
+++ b/lib/snmp/src/misc/snmp_usm.erl
@@ -16,6 +16,8 @@
 %%
 %% %CopyrightEnd%
 %% 
+%% AES: RFC 3826
+%% 
 
 -module(snmp_usm).
 
@@ -24,7 +26,7 @@
 -export([passwd2localized_key/3, localize_key/3]).
 -export([auth_in/4, auth_out/4, set_msg_auth_params/3]).
 -export([des_encrypt/3, des_decrypt/3]).
--export([aes_encrypt/3, aes_decrypt/5]).
+-export([aes_encrypt/5, aes_decrypt/5]).
 
 
 -define(SNMP_USE_V3, true).
@@ -241,11 +243,9 @@ des_decrypt(PrivKey, BadMsgPrivParams, EncData) ->
     throw({error, {bad_msgPrivParams, PrivKey, BadMsgPrivParams, EncData}}).
     
 
-aes_encrypt(PrivKey, Data, SaltFun) ->
+aes_encrypt(PrivKey, Data, SaltFun, EngineBoots, EngineTime) ->
     AesKey = PrivKey,
     Salt = SaltFun(),
-    EngineBoots = snmp_framework_mib:get_engine_boots(),
-    EngineTime = snmp_framework_mib:get_engine_time(),
     IV = list_to_binary([?i32(EngineBoots), ?i32(EngineTime) | Salt]),
     EncData = crypto:block_encrypt(?BLOCK_CIPHER_AES, 
 				   AesKey, IV, Data),