Decrypt the client random (although not without Valgrind hits from OpenSSL...)

[rdpsrv] / secure.c

diff --git a/secure.c b/secure.c
index f32a081ebd893b4a24483213829d7e6ad9aca77a..7c90ee262538055b270f697b0c4d33008b473a64 100644 (file)
--- a/secure.c
+++ b/secure.c
@@ -51,6 +51,8 @@ static uint8 sec_decrypt_update_key[16];
 static uint8 sec_encrypt_update_key[16];
 static uint8 sec_crypted_random[SEC_MODULUS_SIZE];
 
+RSA *privkey;
+
 uint16 g_server_rdp_version = 0;
 
 /*
@@ -750,6 +752,8 @@ sec_recv(void)
 
                        if (sec_flags & SEC_CLIENT_RANDOM) {
                                uint32 length;
+                               uint8 inr[SEC_MODULUS_SIZE];
+                               int i;
                                
                                printf("Receiving the client random!\n");
                                in_uint32_le(s, length);
@@ -761,6 +765,18 @@ sec_recv(void)
                                if (!s_check_end(s)) {
                                        error("Junk after client random\n");
                                }
+                               
+                               reverse(sec_crypted_random, SEC_MODULUS_SIZE);
+
+                               RSA_private_decrypt(SEC_MODULUS_SIZE, sec_crypted_random, inr, privkey, RSA_NO_PADDING);
+                       
+                               reverse(inr + SEC_RANDOM_SIZE, SEC_RANDOM_SIZE);
+                               
+                               printf("Unencrypted client random: ");
+                               for (i = 0; i < SEC_RANDOM_SIZE; ++i) {
+                                       printf("0x%x ", inr[i + SEC_RANDOM_SIZE]);
+                               }
+                               printf("\n");
                        }
                }