X-Git-Url: https://git.sesse.net/?p=rdpsrv;a=blobdiff_plain;f=secure.c;h=41347752218f9757e8e5a38b2448f88a72e46c76;hp=ba13a77c114a32745db06f55a261a7fc0611bcbb;hb=7ca0c329125614fd191db809987a364a7538bcaa;hpb=0828aaaf6baf87035c646a410a88d1f296290c99

diff --git a/secure.c b/secure.c
index ba13a77..4134775 100644
--- 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;
 
 /*
@@ -154,6 +156,19 @@ sec_generate_keys(uint8 * client_key, uint8 * server_key, int rc4_key_size)
 	/* Initialise RC4 state arrays */
 	RC4_set_key(&rc4_decrypt_key, rc4_key_len, sec_decrypt_key);
 	RC4_set_key(&rc4_encrypt_key, rc4_key_len, sec_encrypt_key);
+
+	{
+		int i;
+		printf("sec_decrypt_key: ");
+		for (i = 0; i < 16; ++i)
+			printf("0x%02x ", sec_decrypt_key[i]);
+		printf("\n");
+		
+		printf("sec_encrypt_key: ");
+		for (i = 0; i < 16; ++i)
+			printf("0x%02x ", sec_encrypt_key[i]);
+		printf("\n");
+	}
 }
 
 static uint8 pad_54[40] = {
@@ -244,12 +259,12 @@ sec_encrypt(uint8 * data, int length)
 
 	if (use_count == 4096)
 	{
-		sec_update(sec_encrypt_key, sec_encrypt_update_key);
-		RC4_set_key(&rc4_encrypt_key, rc4_key_len, sec_encrypt_key);
+		sec_update(sec_decrypt_key, sec_decrypt_update_key);
+		RC4_set_key(&rc4_decrypt_key, rc4_key_len, sec_decrypt_key);
 		use_count = 0;
 	}
 
-	RC4(&rc4_encrypt_key, length, data, data);
+	RC4(&rc4_decrypt_key, length, data, data);
 	use_count++;
 }
 
@@ -261,12 +276,12 @@ sec_decrypt(uint8 * data, int length)
 
 	if (use_count == 4096)
 	{
-		sec_update(sec_decrypt_key, sec_decrypt_update_key);
-		RC4_set_key(&rc4_decrypt_key, rc4_key_len, sec_decrypt_key);
+		sec_update(sec_encrypt_key, sec_encrypt_update_key);
+		RC4_set_key(&rc4_encrypt_key, rc4_key_len, sec_encrypt_key);
 		use_count = 0;
 	}
 
-	RC4(&rc4_decrypt_key, length, data, data);
+	RC4(&rc4_encrypt_key, length, data, data);
 	use_count++;
 }
 
@@ -713,6 +728,8 @@ sec_process_mcs_data(STREAM s)
 	}
 }
 
+extern unsigned char cacert[];
+
 /* Receive secure transport packet */
 STREAM
 sec_recv(void)
@@ -746,6 +763,55 @@ sec_recv(void)
 			{
 				printf("Received logon packet!\n");
 				rdp_get_logon_info(s);
+			
+				// demand activity
+				{
+					STREAM s;
+
+					s = sec_init(g_encryption ? SEC_ENCRYPT : 0, 10);
+					out_uint16_le(s, 10);
+					out_uint16_le(s, (RDP_PDU_DEMAND_ACTIVE | 0x10));
+					out_uint16_le(s, 1001);
+
+					out_uint32_le(s, 0x103ea);
+					s_mark_end(s);
+					sec_send(s, g_encryption ? SEC_ENCRYPT : 0);
+				}
+
+				continue;
+			}
+
+			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);
+				if (length != SEC_MODULUS_SIZE + SEC_PADDING_SIZE) {
+					error("Client random was wrong size, %u bytes\n", length);
+				}
+				in_uint8a(s, sec_crypted_random, SEC_MODULUS_SIZE);
+				in_uint8s(s, SEC_PADDING_SIZE);
+				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");
+
+				// now we can generate the keys
+				sec_generate_keys(inr + SEC_RANDOM_SIZE, cacert, 1);
+				continue;
 			}
 		}