X-Git-Url: https://git.distorted.org.uk/~mdw/secnet/blobdiff_plain/088f80a16f384041909c6df6c5fbc98c0d76427f..9c6af4eca6bfb7bed6f86b1f32479f933979c080:/secnet-wireshark.lua

diff --git a/secnet-wireshark.lua b/secnet-wireshark.lua
index 62739bc..5166918 100644
--- a/secnet-wireshark.lua
+++ b/secnet-wireshark.lua
@@ -162,7 +162,7 @@ end
 local function dump_algs(algs)
   -- Dump the algorithms selection ALGS from a site structure.
 
-  return "xform=" .. algs.transform
+  return "xform=" .. algs.transform .. "; dh=" .. algs.dhgroup
 end
 
 local function dump_str(str) return str end
@@ -224,6 +224,8 @@ local CAPTAB = {
 	  desc = "Deprecated Serpent256-CBC transform" },
   [9] = { name = "eaxserpent", kind = "transform",
 	  desc = "Serpent256-EAX transform" },
+  [10] = { name = "tradzp", kind = "dhgroup",
+	   desc = "Traditional Z_p Diffie--Hellman key agreement" },
   [31] = { name = "mobile-priority", kind = "early",
 	   desc = "Mobile site takes priority in case of MSG1 crossing" }
 }
@@ -248,10 +250,11 @@ local function notice_alg_selection(st)
   -- Record the algorithm selections declared in the packet described by ST.
 
   local transform = get_algname("transform", st.transform, "serpent256cbc")
+  local dhgroup = get_algname("dhgroup", st.dhgroup, "tradzp")
   local site = get_site_create(st.sndname)
   local peer = get_site_create(st.rcvname)
   local now = st.pinfo.rel_ts
-  local algs = { transform = transform }
+  local algs = { transform = transform, dhgroup = dhgroup }
   tl_add(get_timeline_create(site.algs, st.rcvname), now, algs)
   tl_add(get_timeline_create(peer.algs, st.sndname), now, algs)
 end
@@ -302,6 +305,7 @@ local M = { NAK		= msgcode(     0, 0),
 	    MSG2	= msgcode(     2, 0),
 	    MSG3	= msgcode(     3, 0),
 	    MSG3BIS	= msgcode(     3, 1),
+	    MSG3TER	= msgcode(     3, 2),
 	    MSG4	= msgcode(     4, 0),
 	    MSG5	= msgcode(     5, 0),
 	    MSG6	= msgcode(     6, 0),
@@ -346,6 +350,7 @@ do
     -- Firstly, build, in `caps', a list of the capability names and their
     -- numbers.
     local i = 1
+    caps[i] = { i = 15, cap = "explicit" }; i = 1 + 1
     for j, cap in pairs(CAPTAB) do
       caps[i] = { i = j, cap = cap.name }
       i = i + 1
@@ -451,6 +456,14 @@ local function dissect_transform(st, buf, tree, pos, sz)
   return pos
 end
 
+local function dissect_dhgroup(st, buf, tree, pos, sz)
+  -- Dissect the selected DH group.  Note this in the packet state for later.
+
+  st.dhgroup = buf(pos, 1):uint()
+  tree:add(PF["secnet.kx.dhgroup"], buf(pos, 1)); pos = pos + 1
+  return pos
+end
+
 local function dissect_lenstr(st, buf, tree, label, pos, sz)
   -- Dissect a simple string given its length.
   local len = buf(pos, 2):uint()
@@ -620,6 +633,23 @@ local PKTINFO = {
 		dissect_wtf },
     hook = notice_alg_selection
   },
+  [M.MSG3TER] = {
+    label = "MSG3TER",
+    info = "MSG3TER",
+    dissect = { make_dissect_name_xinfo("secnet.kx.sndname",
+					{ dissect_caps,
+					  dissect_mtu,
+					  dissect_wtf },
+					notice_sndname),
+		make_dissect_name_xinfo("secnet.kx.rcvname",
+					{ dissect_wtf },
+					notice_rcvname),
+		dissect_sndnonce, dissect_rcvnonce,
+		dissect_transform, dissect_dhgroup,
+		dissect_dhval, dissect_sig,
+		dissect_wtf },
+    hook = notice_alg_selection
+  },
   [M.MSG4] = {
     label = "MSG4",
     info = "MSG4",
@@ -665,7 +695,7 @@ do
   local msgtab = { }
   for i, v in pairs(PKTINFO) do msgtab[i] = v.label end
 
-  local capmap = { transform = { }, early = { } }
+  local capmap = { transform = { }, dhgroup = { }, early = { } }
   for i, v in pairs(CAPTAB) do capmap[v.kind][i] = v.desc end
 
   local ftab = {
@@ -726,6 +756,10 @@ do
       name = "User-assigned capability bits",
       type = ftypes.UINT32, mask = 0x000000ff, base = base.HEX
     },
+    ["secnet.cap.explicit"] = {
+      name = "Transforms listed explicitly; all capability bits used",
+      type = ftypes.BOOLEAN, mask = 0x00008000, base = 32
+    },
     ["secnet.mtu"] = {
       name = "Sender's requested MTU", type = ftypes.UINT16, base = base.DEC
     },
@@ -739,6 +773,10 @@ do
       name = "Selected bulk-crypto transform", type = ftypes.UINT8,
       base = base.DEC, tab = capmap.transform
     },
+    ["secnet.kx.dhgroup"] = {
+      name = "Selected Diffie--Hellman group kind", type = ftypes.UINT8,
+      base = base.DEC, tab = capmap.dhgroup
+    },
     ["secnet.kx.dhval"] = {
       name = "Sender's public Diffie--Hellman value", type = ftypes.NONE
     },