set most of trunk svn property eol-style:native
[reactos.git] / reactos / base / applications / tsclient / rdesktop / licence.c
index c662cd9..fac2766 100644 (file)
-/* -*- c-basic-offset: 8 -*-\r
-   rdesktop: A Remote Desktop Protocol client.\r
-   RDP licensing negotiation\r
-   Copyright (C) Matthew Chapman 1999-2005\r
-\r
-   This program is free software; you can redistribute it and/or modify\r
-   it under the terms of the GNU General Public License as published by\r
-   the Free Software Foundation; either version 2 of the License, or\r
-   (at your option) any later version.\r
-\r
-   This program is distributed in the hope that it will be useful,\r
-   but WITHOUT ANY WARRANTY; without even the implied warranty of\r
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
-   GNU General Public License for more details.\r
-\r
-   You should have received a copy of the GNU General Public License\r
-   along with this program; if not, write to the Free Software\r
-   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.\r
-*/\r
-\r
-#include "rdesktop.h"\r
-#include <openssl/rc4.h> // TODO: remove dependency on OpenSSL\r
-\r
-/* Generate a session key and RC4 keys, given client and server randoms */\r
-static void\r
-licence_generate_keys(RDPCLIENT * This, uint8 * client_random, uint8 * server_random, uint8 * pre_master_secret)\r
-{\r
-       uint8 master_secret[48];\r
-       uint8 key_block[48];\r
-\r
-       /* Generate master secret and then key material */\r
-       sec_hash_48(master_secret, pre_master_secret, client_random, server_random, 'A');\r
-       sec_hash_48(key_block, master_secret, server_random, client_random, 'A');\r
-\r
-       /* Store first 16 bytes of session key as MAC secret */\r
-       memcpy(This->licence.sign_key, key_block, 16);\r
-\r
-       /* Generate RC4 key from next 16 bytes */\r
-       sec_hash_16(This->licence.key, &key_block[16], client_random, server_random);\r
-}\r
-\r
-static void\r
-licence_generate_hwid(RDPCLIENT * This, uint8 * hwid)\r
-{\r
-       buf_out_uint32(hwid, 2);\r
-       strncpy((char *) (hwid + 4), This->licence_hostname, LICENCE_HWID_SIZE - 4);\r
-}\r
-\r
-/* Present an existing licence to the server */\r
-static BOOL\r
-licence_present(RDPCLIENT * This, uint8 * client_random, uint8 * rsa_data,\r
-               uint8 * licence_data, int licence_size, uint8 * hwid, uint8 * signature)\r
-{\r
-       uint32 sec_flags = SEC_LICENCE_NEG;\r
-       uint16 length =\r
-               16 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE +\r
-               licence_size + LICENCE_HWID_SIZE + LICENCE_SIGNATURE_SIZE;\r
-       STREAM s;\r
-\r
-       s = sec_init(This, sec_flags, length + 4);\r
-\r
-       if(s == NULL)\r
-               return False;\r
-\r
-       out_uint8(s, LICENCE_TAG_PRESENT);\r
-       out_uint8(s, 2);        /* version */\r
-       out_uint16_le(s, length);\r
-\r
-       out_uint32_le(s, 1);\r
-       out_uint16(s, 0);\r
-       out_uint16_le(s, 0x0201);\r
-\r
-       out_uint8p(s, client_random, SEC_RANDOM_SIZE);\r
-       out_uint16(s, 0);\r
-       out_uint16_le(s, (SEC_MODULUS_SIZE + SEC_PADDING_SIZE));\r
-       out_uint8p(s, rsa_data, SEC_MODULUS_SIZE);\r
-       out_uint8s(s, SEC_PADDING_SIZE);\r
-\r
-       out_uint16_le(s, 1);\r
-       out_uint16_le(s, licence_size);\r
-       out_uint8p(s, licence_data, licence_size);\r
-\r
-       out_uint16_le(s, 1);\r
-       out_uint16_le(s, LICENCE_HWID_SIZE);\r
-       out_uint8p(s, hwid, LICENCE_HWID_SIZE);\r
-\r
-       out_uint8p(s, signature, LICENCE_SIGNATURE_SIZE);\r
-\r
-       s_mark_end(s);\r
-       return sec_send(This, s, sec_flags);\r
-}\r
-\r
-/* Send a licence request packet */\r
-static BOOL\r
-licence_send_request(RDPCLIENT * This, uint8 * client_random, uint8 * rsa_data, char *user, char *host)\r
-{\r
-       uint32 sec_flags = SEC_LICENCE_NEG;\r
-       uint16 userlen = (uint16)strlen(user) + 1;\r
-       uint16 hostlen = (uint16)strlen(host) + 1;\r
-       uint16 length = 128 + userlen + hostlen;\r
-       STREAM s;\r
-\r
-       s = sec_init(This, sec_flags, length + 2);\r
-\r
-       if(s == NULL)\r
-               return False;\r
-\r
-       out_uint8(s, LICENCE_TAG_REQUEST);\r
-       out_uint8(s, 2);        /* version */\r
-       out_uint16_le(s, length);\r
-\r
-       out_uint32_le(s, 1);\r
-       out_uint16(s, 0);\r
-       out_uint16_le(s, 0xff01);\r
-\r
-       out_uint8p(s, client_random, SEC_RANDOM_SIZE);\r
-       out_uint16(s, 0);\r
-       out_uint16_le(s, (SEC_MODULUS_SIZE + SEC_PADDING_SIZE));\r
-       out_uint8p(s, rsa_data, SEC_MODULUS_SIZE);\r
-       out_uint8s(s, SEC_PADDING_SIZE);\r
-\r
-       out_uint16_le(s, LICENCE_TAG_USER);\r
-       out_uint16_le(s, userlen);\r
-       out_uint8p(s, user, userlen);\r
-\r
-       out_uint16_le(s, LICENCE_TAG_HOST);\r
-       out_uint16_le(s, hostlen);\r
-       out_uint8p(s, host, hostlen);\r
-\r
-       s_mark_end(s);\r
-       return sec_send(This, s, sec_flags);\r
-}\r
-\r
-/* Process a licence demand packet */\r
-static BOOL\r
-licence_process_demand(RDPCLIENT * This, STREAM s)\r
-{\r
-       uint8 null_data[SEC_MODULUS_SIZE];\r
-       uint8 *server_random;\r
-       uint8 signature[LICENCE_SIGNATURE_SIZE];\r
-       uint8 hwid[LICENCE_HWID_SIZE];\r
-       uint8 *licence_data;\r
-       int licence_size;\r
-       RC4_KEY crypt_key;\r
-\r
-       /* Retrieve the server random from the incoming packet */\r
-       in_uint8p(s, server_random, SEC_RANDOM_SIZE);\r
-\r
-       /* We currently use null client keys. This is a bit naughty but, hey,\r
-          the security of licence negotiation isn't exactly paramount. */\r
-       memset(null_data, 0, sizeof(null_data));\r
-       licence_generate_keys(This, null_data, server_random, null_data);\r
-\r
-       licence_size = load_licence(This, &licence_data);\r
-       if (licence_size > 0)\r
-       {\r
-               /* Generate a signature for the HWID buffer */\r
-               licence_generate_hwid(This, hwid);\r
-               sec_sign(signature, 16, This->licence.sign_key, 16, hwid, sizeof(hwid));\r
-\r
-               /* Now encrypt the HWID */\r
-               RC4_set_key(&crypt_key, 16, This->licence.key);\r
-               RC4(&crypt_key, sizeof(hwid), hwid, hwid);\r
-\r
-               if(!licence_present(This, null_data, null_data, licence_data, licence_size, hwid, signature))\r
-                       return False;\r
-\r
-               free(licence_data);\r
-               return True;\r
-       }\r
-\r
-       return licence_send_request(This, null_data, null_data, This->licence_username, This->licence_hostname);\r
-}\r
-\r
-/* Send an authentication response packet */\r
-static BOOL\r
-licence_send_authresp(RDPCLIENT * This, uint8 * token, uint8 * crypt_hwid, uint8 * signature)\r
-{\r
-       uint32 sec_flags = SEC_LICENCE_NEG;\r
-       uint16 length = 58;\r
-       STREAM s;\r
-\r
-       s = sec_init(This, sec_flags, length + 2);\r
-\r
-       if(s == NULL)\r
-               return False;\r
-\r
-       out_uint8(s, LICENCE_TAG_AUTHRESP);\r
-       out_uint8(s, 2);        /* version */\r
-       out_uint16_le(s, length);\r
-\r
-       out_uint16_le(s, 1);\r
-       out_uint16_le(s, LICENCE_TOKEN_SIZE);\r
-       out_uint8p(s, token, LICENCE_TOKEN_SIZE);\r
-\r
-       out_uint16_le(s, 1);\r
-       out_uint16_le(s, LICENCE_HWID_SIZE);\r
-       out_uint8p(s, crypt_hwid, LICENCE_HWID_SIZE);\r
-\r
-       out_uint8p(s, signature, LICENCE_SIGNATURE_SIZE);\r
-\r
-       s_mark_end(s);\r
-       return sec_send(This, s, sec_flags);\r
-}\r
-\r
-/* Parse an authentication request packet */\r
-static BOOL\r
-licence_parse_authreq(STREAM s, uint8 ** token, uint8 ** signature)\r
-{\r
-       uint16 tokenlen;\r
-\r
-       in_uint8s(s, 6);        /* unknown: f8 3d 15 00 04 f6 */\r
-\r
-       in_uint16_le(s, tokenlen);\r
-       if (tokenlen != LICENCE_TOKEN_SIZE)\r
-       {\r
-               error("token len %d\n", tokenlen);\r
-               return False;\r
-       }\r
-\r
-       in_uint8p(s, *token, tokenlen);\r
-       in_uint8p(s, *signature, LICENCE_SIGNATURE_SIZE);\r
-\r
-       return s_check_end(s);\r
-}\r
-\r
-/* Process an authentication request packet */\r
-static void\r
-licence_process_authreq(RDPCLIENT * This, STREAM s)\r
-{\r
-       uint8 *in_token, *in_sig;\r
-       uint8 out_token[LICENCE_TOKEN_SIZE], decrypt_token[LICENCE_TOKEN_SIZE];\r
-       uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];\r
-       uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];\r
-       uint8 out_sig[LICENCE_SIGNATURE_SIZE];\r
-       RC4_KEY crypt_key;\r
-\r
-       /* Parse incoming packet and save the encrypted token */\r
-       licence_parse_authreq(s, &in_token, &in_sig);\r
-       memcpy(out_token, in_token, LICENCE_TOKEN_SIZE);\r
-\r
-       /* Decrypt the token. It should read TEST in Unicode. */\r
-       RC4_set_key(&crypt_key, 16, This->licence.key);\r
-       RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token);\r
-\r
-       /* Generate a signature for a buffer of token and HWID */\r
-       licence_generate_hwid(This, hwid);\r
-       memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);\r
-       memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);\r
-       sec_sign(out_sig, 16, This->licence.sign_key, 16, sealed_buffer, sizeof(sealed_buffer));\r
-\r
-       /* Now encrypt the HWID */\r
-       RC4_set_key(&crypt_key, 16, This->licence.key);\r
-       RC4(&crypt_key, LICENCE_HWID_SIZE, hwid, crypt_hwid);\r
-\r
-       licence_send_authresp(This, out_token, crypt_hwid, out_sig);\r
-}\r
-\r
-/* Process an licence issue packet */\r
-static void\r
-licence_process_issue(RDPCLIENT * This, STREAM s)\r
-{\r
-       RC4_KEY crypt_key;\r
-       uint32 length;\r
-       uint16 check;\r
-       int i;\r
-\r
-       in_uint8s(s, 2);        /* 3d 45 - unknown */\r
-       in_uint16_le(s, length);\r
-       if (!s_check_rem(s, length))\r
-               return;\r
-\r
-       RC4_set_key(&crypt_key, 16, This->licence.key);\r
-       RC4(&crypt_key, length, s->p, s->p);\r
-\r
-       in_uint16(s, check);\r
-       if (check != 0)\r
-               return;\r
-\r
-       This->licence_issued = True;\r
-\r
-       in_uint8s(s, 2);        /* pad */\r
-\r
-       /* advance to fourth string */\r
-       length = 0;\r
-       for (i = 0; i < 4; i++)\r
-       {\r
-               in_uint8s(s, length);\r
-               in_uint32_le(s, length);\r
-               if (!s_check_rem(s, length))\r
-                       return;\r
-       }\r
-\r
-       This->licence_issued = True;\r
-       save_licence(This, s->p, length);\r
-}\r
-\r
-/* Process a licence packet */\r
-void\r
-licence_process(RDPCLIENT * This, STREAM s)\r
-{\r
-       uint8 tag;\r
-\r
-       in_uint8(s, tag);\r
-       in_uint8s(s, 3);        /* version, length */\r
-\r
-       switch (tag)\r
-       {\r
-               case LICENCE_TAG_DEMAND:\r
-                       licence_process_demand(This, s);\r
-                       break;\r
-\r
-               case LICENCE_TAG_AUTHREQ:\r
-                       licence_process_authreq(This, s);\r
-                       break;\r
-\r
-               case LICENCE_TAG_ISSUE:\r
-                       licence_process_issue(This, s);\r
-                       break;\r
-\r
-               case LICENCE_TAG_REISSUE:\r
-               case LICENCE_TAG_RESULT:\r
-                       break;\r
-\r
-               default:\r
-                       unimpl("licence tag 0x%x\n", tag);\r
-       }\r
-}\r
+/* -*- c-basic-offset: 8 -*-
+   rdesktop: A Remote Desktop Protocol client.
+   RDP licensing negotiation
+   Copyright (C) Matthew Chapman 1999-2005
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "rdesktop.h"
+#include <openssl/rc4.h> // TODO: remove dependency on OpenSSL
+
+/* Generate a session key and RC4 keys, given client and server randoms */
+static void
+licence_generate_keys(RDPCLIENT * This, uint8 * client_random, uint8 * server_random, uint8 * pre_master_secret)
+{
+       uint8 master_secret[48];
+       uint8 key_block[48];
+
+       /* Generate master secret and then key material */
+       sec_hash_48(master_secret, pre_master_secret, client_random, server_random, 'A');
+       sec_hash_48(key_block, master_secret, server_random, client_random, 'A');
+
+       /* Store first 16 bytes of session key as MAC secret */
+       memcpy(This->licence.sign_key, key_block, 16);
+
+       /* Generate RC4 key from next 16 bytes */
+       sec_hash_16(This->licence.key, &key_block[16], client_random, server_random);
+}
+
+static void
+licence_generate_hwid(RDPCLIENT * This, uint8 * hwid)
+{
+       buf_out_uint32(hwid, 2);
+       strncpy((char *) (hwid + 4), This->licence_hostname, LICENCE_HWID_SIZE - 4);
+}
+
+/* Present an existing licence to the server */
+static BOOL
+licence_present(RDPCLIENT * This, uint8 * client_random, uint8 * rsa_data,
+               uint8 * licence_data, int licence_size, uint8 * hwid, uint8 * signature)
+{
+       uint32 sec_flags = SEC_LICENCE_NEG;
+       uint16 length =
+               16 + SEC_RANDOM_SIZE + SEC_MODULUS_SIZE + SEC_PADDING_SIZE +
+               licence_size + LICENCE_HWID_SIZE + LICENCE_SIGNATURE_SIZE;
+       STREAM s;
+
+       s = sec_init(This, sec_flags, length + 4);
+
+       if(s == NULL)
+               return False;
+
+       out_uint8(s, LICENCE_TAG_PRESENT);
+       out_uint8(s, 2);        /* version */
+       out_uint16_le(s, length);
+
+       out_uint32_le(s, 1);
+       out_uint16(s, 0);
+       out_uint16_le(s, 0x0201);
+
+       out_uint8p(s, client_random, SEC_RANDOM_SIZE);
+       out_uint16(s, 0);
+       out_uint16_le(s, (SEC_MODULUS_SIZE + SEC_PADDING_SIZE));
+       out_uint8p(s, rsa_data, SEC_MODULUS_SIZE);
+       out_uint8s(s, SEC_PADDING_SIZE);
+
+       out_uint16_le(s, 1);
+       out_uint16_le(s, licence_size);
+       out_uint8p(s, licence_data, licence_size);
+
+       out_uint16_le(s, 1);
+       out_uint16_le(s, LICENCE_HWID_SIZE);
+       out_uint8p(s, hwid, LICENCE_HWID_SIZE);
+
+       out_uint8p(s, signature, LICENCE_SIGNATURE_SIZE);
+
+       s_mark_end(s);
+       return sec_send(This, s, sec_flags);
+}
+
+/* Send a licence request packet */
+static BOOL
+licence_send_request(RDPCLIENT * This, uint8 * client_random, uint8 * rsa_data, char *user, char *host)
+{
+       uint32 sec_flags = SEC_LICENCE_NEG;
+       uint16 userlen = (uint16)strlen(user) + 1;
+       uint16 hostlen = (uint16)strlen(host) + 1;
+       uint16 length = 128 + userlen + hostlen;
+       STREAM s;
+
+       s = sec_init(This, sec_flags, length + 2);
+
+       if(s == NULL)
+               return False;
+
+       out_uint8(s, LICENCE_TAG_REQUEST);
+       out_uint8(s, 2);        /* version */
+       out_uint16_le(s, length);
+
+       out_uint32_le(s, 1);
+       out_uint16(s, 0);
+       out_uint16_le(s, 0xff01);
+
+       out_uint8p(s, client_random, SEC_RANDOM_SIZE);
+       out_uint16(s, 0);
+       out_uint16_le(s, (SEC_MODULUS_SIZE + SEC_PADDING_SIZE));
+       out_uint8p(s, rsa_data, SEC_MODULUS_SIZE);
+       out_uint8s(s, SEC_PADDING_SIZE);
+
+       out_uint16_le(s, LICENCE_TAG_USER);
+       out_uint16_le(s, userlen);
+       out_uint8p(s, user, userlen);
+
+       out_uint16_le(s, LICENCE_TAG_HOST);
+       out_uint16_le(s, hostlen);
+       out_uint8p(s, host, hostlen);
+
+       s_mark_end(s);
+       return sec_send(This, s, sec_flags);
+}
+
+/* Process a licence demand packet */
+static BOOL
+licence_process_demand(RDPCLIENT * This, STREAM s)
+{
+       uint8 null_data[SEC_MODULUS_SIZE];
+       uint8 *server_random;
+       uint8 signature[LICENCE_SIGNATURE_SIZE];
+       uint8 hwid[LICENCE_HWID_SIZE];
+       uint8 *licence_data;
+       int licence_size;
+       RC4_KEY crypt_key;
+
+       /* Retrieve the server random from the incoming packet */
+       in_uint8p(s, server_random, SEC_RANDOM_SIZE);
+
+       /* We currently use null client keys. This is a bit naughty but, hey,
+          the security of licence negotiation isn't exactly paramount. */
+       memset(null_data, 0, sizeof(null_data));
+       licence_generate_keys(This, null_data, server_random, null_data);
+
+       licence_size = load_licence(This, &licence_data);
+       if (licence_size > 0)
+       {
+               /* Generate a signature for the HWID buffer */
+               licence_generate_hwid(This, hwid);
+               sec_sign(signature, 16, This->licence.sign_key, 16, hwid, sizeof(hwid));
+
+               /* Now encrypt the HWID */
+               RC4_set_key(&crypt_key, 16, This->licence.key);
+               RC4(&crypt_key, sizeof(hwid), hwid, hwid);
+
+               if(!licence_present(This, null_data, null_data, licence_data, licence_size, hwid, signature))
+                       return False;
+
+               free(licence_data);
+               return True;
+       }
+
+       return licence_send_request(This, null_data, null_data, This->licence_username, This->licence_hostname);
+}
+
+/* Send an authentication response packet */
+static BOOL
+licence_send_authresp(RDPCLIENT * This, uint8 * token, uint8 * crypt_hwid, uint8 * signature)
+{
+       uint32 sec_flags = SEC_LICENCE_NEG;
+       uint16 length = 58;
+       STREAM s;
+
+       s = sec_init(This, sec_flags, length + 2);
+
+       if(s == NULL)
+               return False;
+
+       out_uint8(s, LICENCE_TAG_AUTHRESP);
+       out_uint8(s, 2);        /* version */
+       out_uint16_le(s, length);
+
+       out_uint16_le(s, 1);
+       out_uint16_le(s, LICENCE_TOKEN_SIZE);
+       out_uint8p(s, token, LICENCE_TOKEN_SIZE);
+
+       out_uint16_le(s, 1);
+       out_uint16_le(s, LICENCE_HWID_SIZE);
+       out_uint8p(s, crypt_hwid, LICENCE_HWID_SIZE);
+
+       out_uint8p(s, signature, LICENCE_SIGNATURE_SIZE);
+
+       s_mark_end(s);
+       return sec_send(This, s, sec_flags);
+}
+
+/* Parse an authentication request packet */
+static BOOL
+licence_parse_authreq(STREAM s, uint8 ** token, uint8 ** signature)
+{
+       uint16 tokenlen;
+
+       in_uint8s(s, 6);        /* unknown: f8 3d 15 00 04 f6 */
+
+       in_uint16_le(s, tokenlen);
+       if (tokenlen != LICENCE_TOKEN_SIZE)
+       {
+               error("token len %d\n", tokenlen);
+               return False;
+       }
+
+       in_uint8p(s, *token, tokenlen);
+       in_uint8p(s, *signature, LICENCE_SIGNATURE_SIZE);
+
+       return s_check_end(s);
+}
+
+/* Process an authentication request packet */
+static void
+licence_process_authreq(RDPCLIENT * This, STREAM s)
+{
+       uint8 *in_token, *in_sig;
+       uint8 out_token[LICENCE_TOKEN_SIZE], decrypt_token[LICENCE_TOKEN_SIZE];
+       uint8 hwid[LICENCE_HWID_SIZE], crypt_hwid[LICENCE_HWID_SIZE];
+       uint8 sealed_buffer[LICENCE_TOKEN_SIZE + LICENCE_HWID_SIZE];
+       uint8 out_sig[LICENCE_SIGNATURE_SIZE];
+       RC4_KEY crypt_key;
+
+       /* Parse incoming packet and save the encrypted token */
+       licence_parse_authreq(s, &in_token, &in_sig);
+       memcpy(out_token, in_token, LICENCE_TOKEN_SIZE);
+
+       /* Decrypt the token. It should read TEST in Unicode. */
+       RC4_set_key(&crypt_key, 16, This->licence.key);
+       RC4(&crypt_key, LICENCE_TOKEN_SIZE, in_token, decrypt_token);
+
+       /* Generate a signature for a buffer of token and HWID */
+       licence_generate_hwid(This, hwid);
+       memcpy(sealed_buffer, decrypt_token, LICENCE_TOKEN_SIZE);
+       memcpy(sealed_buffer + LICENCE_TOKEN_SIZE, hwid, LICENCE_HWID_SIZE);
+       sec_sign(out_sig, 16, This->licence.sign_key, 16, sealed_buffer, sizeof(sealed_buffer));
+
+       /* Now encrypt the HWID */
+       RC4_set_key(&crypt_key, 16, This->licence.key);
+       RC4(&crypt_key, LICENCE_HWID_SIZE, hwid, crypt_hwid);
+
+       licence_send_authresp(This, out_token, crypt_hwid, out_sig);
+}
+
+/* Process an licence issue packet */
+static void
+licence_process_issue(RDPCLIENT * This, STREAM s)
+{
+       RC4_KEY crypt_key;
+       uint32 length;
+       uint16 check;
+       int i;
+
+       in_uint8s(s, 2);        /* 3d 45 - unknown */
+       in_uint16_le(s, length);
+       if (!s_check_rem(s, length))
+               return;
+
+       RC4_set_key(&crypt_key, 16, This->licence.key);
+       RC4(&crypt_key, length, s->p, s->p);
+
+       in_uint16(s, check);
+       if (check != 0)
+               return;
+
+       This->licence_issued = True;
+
+       in_uint8s(s, 2);        /* pad */
+
+       /* advance to fourth string */
+       length = 0;
+       for (i = 0; i < 4; i++)
+       {
+               in_uint8s(s, length);
+               in_uint32_le(s, length);
+               if (!s_check_rem(s, length))
+                       return;
+       }
+
+       This->licence_issued = True;
+       save_licence(This, s->p, length);
+}
+
+/* Process a licence packet */
+void
+licence_process(RDPCLIENT * This, STREAM s)
+{
+       uint8 tag;
+
+       in_uint8(s, tag);
+       in_uint8s(s, 3);        /* version, length */
+
+       switch (tag)
+       {
+               case LICENCE_TAG_DEMAND:
+                       licence_process_demand(This, s);
+                       break;
+
+               case LICENCE_TAG_AUTHREQ:
+                       licence_process_authreq(This, s);
+                       break;
+
+               case LICENCE_TAG_ISSUE:
+                       licence_process_issue(This, s);
+                       break;
+
+               case LICENCE_TAG_REISSUE:
+               case LICENCE_TAG_RESULT:
+                       break;
+
+               default:
+                       unimpl("licence tag 0x%x\n", tag);
+       }
+}