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Issue-ID: PORTAL-1084

Signed-off-by: Fiete Ostkamp <Fiete.Ostkamp@telekom.de>
Change-Id: Id0c94859a775094e67b0bb9c91ca5e776a08c068

1 files changed, 142 insertions, 0 deletions

diff --git a/server/resty/openssl/dh.lua b/server/resty/openssl/dh.lua
new file mode 100644
index 0000000..93e4941
--- /dev/null
+++ b/server/resty/openssl/dh.lua
@@ -0,0 +1,142 @@
+local ffi = require "ffi"
+local C = ffi.C
+
+require "resty.openssl.include.dh"
+local bn_lib = require "resty.openssl.bn"
+
+local OPENSSL_10 = require("resty.openssl.version").OPENSSL_10
+local OPENSSL_11_OR_LATER = require("resty.openssl.version").OPENSSL_11_OR_LATER
+local format_error = require("resty.openssl.err").format_error
+
+local _M = {}
+
+_M.params = {"public", "private", "p", "q", "g"}
+
+local empty_table = {}
+local bn_ptrptr_ct = ffi.typeof("const BIGNUM *[1]")
+function _M.get_parameters(dh_st)
+  return setmetatable(empty_table, {
+    __index = function(_, k)
+      local ptr, ret
+      if OPENSSL_11_OR_LATER then
+        ptr = bn_ptrptr_ct()
+      end
+
+      if OPENSSL_11_OR_LATER then
+        ptr = bn_ptrptr_ct()
+      end
+
+      if k == 'p' then
+        if OPENSSL_11_OR_LATER then
+          C.DH_get0_pqg(dh_st, ptr, nil, nil)
+        end
+      elseif k == 'q' then
+        if OPENSSL_11_OR_LATER then
+          C.DH_get0_pqg(dh_st, nil, ptr, nil)
+        end
+      elseif k == 'g' then
+        if OPENSSL_11_OR_LATER then
+          C.DH_get0_pqg(dh_st, nil, nil, ptr)
+        end
+      elseif k == 'public' then
+        if OPENSSL_11_OR_LATER then
+          C.DH_get0_key(dh_st, ptr, nil)
+        end
+        k = "pub_key"
+      elseif k == 'private' then
+        if OPENSSL_11_OR_LATER then
+          C.DH_get0_key(dh_st, nil, ptr)
+        end
+        k = "priv_key"
+      else
+        return nil, "rsa.get_parameters: unknown parameter \"" .. k .. "\" for RSA key"
+      end
+
+      if OPENSSL_11_OR_LATER then
+        ret = ptr[0]
+      elseif OPENSSL_10 then
+        ret = dh_st[k]
+      end
+
+      if ret == nil then
+        return nil
+      end
+      return bn_lib.dup(ret)
+    end
+  }), nil
+end
+
+local function dup_bn_value(v)
+  if not bn_lib.istype(v) then
+    return nil, "expect value to be a bn instance"
+  end
+  local bn = C.BN_dup(v.ctx)
+  if bn == nil then
+    return nil, "BN_dup() failed"
+  end
+  return bn
+end
+
+function _M.set_parameters(dh_st, opts)
+  local err
+  local opts_bn = {}
+  -- remember which parts of BNs has been added to dh_st, they should be freed
+  -- by DH_free and we don't cleanup them on failure
+  local cleanup_from_idx = 1
+  -- dup input
+  local do_set_key, do_set_pqg
+  for k, v in pairs(opts) do
+    opts_bn[k], err = dup_bn_value(v)
+    if err then
+      err = "dh.set_parameters: cannot process parameter \"" .. k .. "\":" .. err
+      goto cleanup_with_error
+    end
+    if k == "private" or k == "public" then
+      do_set_key = true
+    elseif k == "p" or k == "q" or k == "g" then
+      do_set_pqg = true
+    end
+  end
+  if OPENSSL_11_OR_LATER then
+    local code
+    if do_set_key then
+      code = C.DH_set0_key(dh_st, opts_bn["public"], opts_bn["private"])
+      if code == 0 then
+        err = format_error("dh.set_parameters: DH_set0_key")
+        goto cleanup_with_error
+      end
+    end
+    cleanup_from_idx = cleanup_from_idx + 2
+    if do_set_pqg then
+      code = C.DH_set0_pqg(dh_st, opts_bn["p"], opts_bn["q"], opts_bn["g"])
+      if code == 0 then
+        err = format_error("dh.set_parameters: DH_set0_pqg")
+        goto cleanup_with_error
+      end
+    end
+    return true
+  elseif OPENSSL_10 then
+    for k, v in pairs(opts_bn) do
+      if k == "public" then
+        k = "pub_key"
+      elseif k == "private" then
+        k = "priv_key"
+      end
+      if dh_st[k] ~= nil then
+        C.BN_free(dh_st[k])
+      end
+      dh_st[k]= v
+    end
+    return true
+  end
+
+::cleanup_with_error::
+  for i, k in pairs(_M.params) do
+    if i >= cleanup_from_idx then
+      C.BN_free(opts_bn[k])
+    end
+  end
+  return false, err
+end
+
+return _M