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-rw-r--r--epan/dissectors/packet-ntlmssp.c1612
1 files changed, 1612 insertions, 0 deletions
diff --git a/epan/dissectors/packet-ntlmssp.c b/epan/dissectors/packet-ntlmssp.c
new file mode 100644
index 0000000000..1d3cbcca20
--- /dev/null
+++ b/epan/dissectors/packet-ntlmssp.c
@@ -0,0 +1,1612 @@
+/* packet-ntlmssp.c
+ * Routines for NTLM Secure Service Provider
+ * Devin Heitmueller <dheitmueller@netilla.com>
+ * Copyright 2003, Tim Potter <tpot@samba.org>
+ *
+ * $Id$
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@ethereal.com>
+ * Copyright 1998 Gerald Combs
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <glib.h>
+#include <epan/packet.h>
+
+#include "packet-smb-common.h"
+#include "asn1.h" /* XXX - needed for subid_t */
+#include "packet-gssapi.h"
+#include "packet-frame.h"
+#include "prefs.h"
+#include "crypt-rc4.h"
+#include "crypt-md4.h"
+#include "crypt-des.h"
+#include "packet-dcerpc.h"
+
+/* Message types */
+
+#define NTLMSSP_NEGOTIATE 1
+#define NTLMSSP_CHALLENGE 2
+#define NTLMSSP_AUTH 3
+#define NTLMSSP_UNKNOWN 4
+
+static const value_string ntlmssp_message_types[] = {
+ { NTLMSSP_NEGOTIATE, "NTLMSSP_NEGOTIATE" },
+ { NTLMSSP_CHALLENGE, "NTLMSSP_CHALLENGE" },
+ { NTLMSSP_AUTH, "NTLMSSP_AUTH" },
+ { NTLMSSP_UNKNOWN, "NTLMSSP_UNKNOWN" },
+ { 0, NULL }
+};
+
+/*
+ * NTLMSSP negotiation flags
+ * Taken from Samba
+ */
+#define NTLMSSP_NEGOTIATE_UNICODE 0x00000001
+#define NTLMSSP_NEGOTIATE_OEM 0x00000002
+#define NTLMSSP_REQUEST_TARGET 0x00000004
+#define NTLMSSP_NEGOTIATE_00000008 0x00000008
+#define NTLMSSP_NEGOTIATE_SIGN 0x00000010
+#define NTLMSSP_NEGOTIATE_SEAL 0x00000020
+#define NTLMSSP_NEGOTIATE_DATAGRAM_STYLE 0x00000040
+#define NTLMSSP_NEGOTIATE_LM_KEY 0x00000080
+#define NTLMSSP_NEGOTIATE_NETWARE 0x00000100
+#define NTLMSSP_NEGOTIATE_NTLM 0x00000200
+#define NTLMSSP_NEGOTIATE_00000400 0x00000400
+#define NTLMSSP_NEGOTIATE_00000800 0x00000800
+#define NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED 0x00001000
+#define NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED 0x00002000
+#define NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL 0x00004000
+#define NTLMSSP_NEGOTIATE_ALWAYS_SIGN 0x00008000
+#define NTLMSSP_CHAL_INIT_RESPONSE 0x00010000
+#define NTLMSSP_CHAL_ACCEPT_RESPONSE 0x00020000
+#define NTLMSSP_CHAL_NON_NT_SESSION_KEY 0x00040000
+#define NTLMSSP_NEGOTIATE_NTLM2 0x00080000
+#define NTLMSSP_NEGOTIATE_00100000 0x00100000
+#define NTLMSSP_NEGOTIATE_00200000 0x00200000
+#define NTLMSSP_NEGOTIATE_00400000 0x00400000
+#define NTLMSSP_CHAL_TARGET_INFO 0x00800000
+#define NTLMSSP_NEGOTIATE_01000000 0x01000000
+#define NTLMSSP_NEGOTIATE_02000000 0x02000000
+#define NTLMSSP_NEGOTIATE_04000000 0x04000000
+#define NTLMSSP_NEGOTIATE_08000000 0x08000000
+#define NTLMSSP_NEGOTIATE_10000000 0x10000000
+#define NTLMSSP_NEGOTIATE_128 0x20000000
+#define NTLMSSP_NEGOTIATE_KEY_EXCH 0x40000000
+#define NTLMSSP_NEGOTIATE_80000000 0x80000000
+
+static int proto_ntlmssp = -1;
+static int hf_ntlmssp = -1;
+static int hf_ntlmssp_auth = -1;
+static int hf_ntlmssp_message_type = -1;
+static int hf_ntlmssp_negotiate_flags = -1;
+static int hf_ntlmssp_negotiate_flags_01 = -1;
+static int hf_ntlmssp_negotiate_flags_02 = -1;
+static int hf_ntlmssp_negotiate_flags_04 = -1;
+static int hf_ntlmssp_negotiate_flags_08 = -1;
+static int hf_ntlmssp_negotiate_flags_10 = -1;
+static int hf_ntlmssp_negotiate_flags_20 = -1;
+static int hf_ntlmssp_negotiate_flags_40 = -1;
+static int hf_ntlmssp_negotiate_flags_80 = -1;
+static int hf_ntlmssp_negotiate_flags_100 = -1;
+static int hf_ntlmssp_negotiate_flags_200 = -1;
+static int hf_ntlmssp_negotiate_flags_400 = -1;
+static int hf_ntlmssp_negotiate_flags_800 = -1;
+static int hf_ntlmssp_negotiate_flags_1000 = -1;
+static int hf_ntlmssp_negotiate_flags_2000 = -1;
+static int hf_ntlmssp_negotiate_flags_4000 = -1;
+static int hf_ntlmssp_negotiate_flags_8000 = -1;
+static int hf_ntlmssp_negotiate_flags_10000 = -1;
+static int hf_ntlmssp_negotiate_flags_20000 = -1;
+static int hf_ntlmssp_negotiate_flags_40000 = -1;
+static int hf_ntlmssp_negotiate_flags_80000 = -1;
+static int hf_ntlmssp_negotiate_flags_100000 = -1;
+static int hf_ntlmssp_negotiate_flags_200000 = -1;
+static int hf_ntlmssp_negotiate_flags_400000 = -1;
+static int hf_ntlmssp_negotiate_flags_800000 = -1;
+static int hf_ntlmssp_negotiate_flags_1000000 = -1;
+static int hf_ntlmssp_negotiate_flags_2000000 = -1;
+static int hf_ntlmssp_negotiate_flags_4000000 = -1;
+static int hf_ntlmssp_negotiate_flags_8000000 = -1;
+static int hf_ntlmssp_negotiate_flags_10000000 = -1;
+static int hf_ntlmssp_negotiate_flags_20000000 = -1;
+static int hf_ntlmssp_negotiate_flags_40000000 = -1;
+static int hf_ntlmssp_negotiate_flags_80000000 = -1;
+static int hf_ntlmssp_negotiate_workstation_strlen = -1;
+static int hf_ntlmssp_negotiate_workstation_maxlen = -1;
+static int hf_ntlmssp_negotiate_workstation_buffer = -1;
+static int hf_ntlmssp_negotiate_workstation = -1;
+static int hf_ntlmssp_negotiate_domain_strlen = -1;
+static int hf_ntlmssp_negotiate_domain_maxlen = -1;
+static int hf_ntlmssp_negotiate_domain_buffer = -1;
+static int hf_ntlmssp_negotiate_domain = -1;
+static int hf_ntlmssp_ntlm_challenge = -1;
+static int hf_ntlmssp_reserved = -1;
+static int hf_ntlmssp_challenge_domain = -1;
+static int hf_ntlmssp_auth_username = -1;
+static int hf_ntlmssp_auth_domain = -1;
+static int hf_ntlmssp_auth_hostname = -1;
+static int hf_ntlmssp_auth_lmresponse = -1;
+static int hf_ntlmssp_auth_ntresponse = -1;
+static int hf_ntlmssp_auth_sesskey = -1;
+static int hf_ntlmssp_string_len = -1;
+static int hf_ntlmssp_string_maxlen = -1;
+static int hf_ntlmssp_string_offset = -1;
+static int hf_ntlmssp_blob_len = -1;
+static int hf_ntlmssp_blob_maxlen = -1;
+static int hf_ntlmssp_blob_offset = -1;
+static int hf_ntlmssp_address_list = -1;
+static int hf_ntlmssp_address_list_len = -1;
+static int hf_ntlmssp_address_list_maxlen = -1;
+static int hf_ntlmssp_address_list_offset = -1;
+static int hf_ntlmssp_address_list_server_nb = -1;
+static int hf_ntlmssp_address_list_domain_nb = -1;
+static int hf_ntlmssp_address_list_server_dns = -1;
+static int hf_ntlmssp_address_list_domain_dns = -1;
+static int hf_ntlmssp_address_list_terminator = -1;
+static int hf_ntlmssp_address_list_item_type = -1;
+static int hf_ntlmssp_address_list_item_len = -1;
+static int hf_ntlmssp_address_list_item_content = -1;
+static int hf_ntlmssp_verf = -1;
+static int hf_ntlmssp_verf_vers = -1;
+static int hf_ntlmssp_verf_body = -1;
+static int hf_ntlmssp_verf_unknown1 = -1;
+static int hf_ntlmssp_verf_crc32 = -1;
+static int hf_ntlmssp_verf_sequence = -1;
+static int hf_ntlmssp_decrypted_payload = -1;
+
+static gint ett_ntlmssp = -1;
+static gint ett_ntlmssp_negotiate_flags = -1;
+static gint ett_ntlmssp_string = -1;
+static gint ett_ntlmssp_blob = -1;
+static gint ett_ntlmssp_address_list = -1;
+static gint ett_ntlmssp_address_list_item = -1;
+
+/* Configuration variables */
+static char *nt_password = NULL;
+
+#define MAX_BLOB_SIZE 256
+typedef struct _ntlmssp_blob {
+ guint16 length;
+ guint8 contents[MAX_BLOB_SIZE];
+} ntlmssp_blob;
+
+/* Used in the conversation function */
+typedef struct _ntlmssp_info {
+ guint32 flags;
+ rc4_state_struct rc4_state_peer1;
+ rc4_state_struct rc4_state_peer2;
+ guint32 peer1_dest_port;
+ int rc4_state_initialized;
+ ntlmssp_blob ntlm_response;
+ ntlmssp_blob lm_response;
+} ntlmssp_info;
+
+/*
+ * GMemChunk from which ntlmssp_info structures are allocated.
+ */
+static GMemChunk *ntlmssp_info_chunk;
+static int ntlmssp_info_count = 10;
+
+/* If this struct exists in the payload_decrypt, then we have already
+ decrypted it once */
+typedef struct _ntlmssp_packet_info {
+ guint32 flags;
+ guint8 *decrypted_payload;
+ guint8 verifier[16];
+ gboolean payload_decrypted;
+ gboolean verifier_decrypted;
+} ntlmssp_packet_info;
+
+/*
+ * GMemChunk from which ntlmssp_packet_info structures are allocated.
+ */
+static GMemChunk *ntlmssp_packet_info_chunk;
+static int ntlmssp_packet_info_count = 10;
+
+/*
+ * GSlist of decrypted payloads.
+ */
+static GSList *decrypted_payloads;
+
+/*
+ Generate a challenge response, given an eight byte challenge and
+ either the NT or the Lan Manager password hash (16 bytes).
+ Returns output in response, which is expected to be 24 bytes.
+*/
+static int ntlmssp_generate_challenge_response(guint8 *response,
+ const guint8 *passhash,
+ const guint8 *challenge)
+{
+ guint8 pw21[21]; /* Password hash padded to 21 bytes */
+
+ memset(pw21, 0x0, sizeof(pw21));
+ memcpy(pw21, passhash, 16);
+
+ memset(response, 0, 24);
+
+ crypt_des_ecb(response, challenge, pw21, 1);
+ crypt_des_ecb(response + 8, challenge, pw21 + 7, 1);
+ crypt_des_ecb(response + 16, challenge, pw21 + 14, 1);
+
+ return 1;
+}
+
+/* Create an NTLMSSP version 1 key.
+ * password points to the ANSI password to encrypt, challenge points to
+ * the 8 octet challenge string, key128 will do a 128 bit key if set to 1,
+ * otherwise it will do a 40 bit key. The result is stored in
+ * sspkey (expected to be 16 octets)
+ */
+static void
+create_ntlmssp_v1_key(const char *nt_password, const guint8 *challenge,
+ int use_key_128, guint8 *sspkey)
+{
+ unsigned char lm_password_upper[16];
+ unsigned char lm_password_hash[16];
+ guint8 lm_challenge_response[24];
+ guint8 rc4key[24];
+ guint8 pw21[21]; /* Password hash padded to 21 bytes */
+ size_t password_len;
+ unsigned int i;
+ unsigned char lmhash_key[] =
+ {0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25};
+
+ memset(lm_password_upper, 0, sizeof(lm_password_upper));
+
+ /* Create a Lan Manager hash of the input password */
+ if (nt_password[0] != '\0') {
+ password_len = strlen(nt_password);
+ /* Truncate password if too long */
+ if (password_len > 16)
+ password_len = 16;
+ for (i = 0; i < password_len; i++) {
+ lm_password_upper[i] = toupper(nt_password[i]);
+ }
+ }
+
+ crypt_des_ecb(lm_password_hash, lmhash_key, lm_password_upper, 1);
+ crypt_des_ecb(lm_password_hash+8, lmhash_key, lm_password_upper+7, 1);
+
+ /* Generate the LanMan Challenge Response */
+ ntlmssp_generate_challenge_response(lm_challenge_response,
+ lm_password_hash, challenge);
+
+ /* Generate the NTLMSSP-v1 RC4 Key.
+ * The RC4 key is derived from the Lan Manager Hash.
+ * See lkcl "DCE/RPC over SMB" page 254 for the algorithm.
+ */
+ memset(pw21, 0xBD, sizeof(pw21));
+ memcpy(pw21, lm_password_hash, sizeof(lm_password_hash));
+
+ /* Only the first eight bytes of challenge_response is used */
+ crypt_des_ecb(rc4key, lm_challenge_response, pw21, 1);
+ crypt_des_ecb(rc4key + 8, lm_challenge_response, pw21 + 7, 1);
+ crypt_des_ecb(rc4key + 16, lm_challenge_response, pw21 + 14, 1);
+
+ /* Create the SSP Key */
+ memset(sspkey, 0, sizeof(sspkey));
+ if (use_key_128) {
+ /* Create 128 bit key */
+ memcpy(sspkey, rc4key, 16);
+ }
+ else {
+ /* Create 40 bit key */
+ memcpy(sspkey, rc4key, 5);
+ sspkey[5]=0xe5;
+ sspkey[6]=0x38;
+ sspkey[7]=0xb0;
+ }
+ return;
+}
+
+/* dissect a string - header area contains:
+ two byte len
+ two byte maxlen
+ four byte offset of string in data area
+ The function returns the offset at the end of the string header,
+ but the 'end' parameter returns the offset of the end of the string itself
+ The 'start' parameter returns the offset of the beginning of the string
+*/
+static int
+dissect_ntlmssp_string (tvbuff_t *tvb, int offset,
+ proto_tree *ntlmssp_tree,
+ gboolean unicode_strings,
+ int string_hf, int *start, int *end)
+{
+ proto_tree *tree = NULL;
+ proto_item *tf = NULL;
+ gint16 string_length = tvb_get_letohs(tvb, offset);
+ gint16 string_maxlen = tvb_get_letohs(tvb, offset+2);
+ gint32 string_offset = tvb_get_letohl(tvb, offset+4);
+ const char *string_text = NULL;
+ int result_length;
+ guint16 bc;
+
+ *start = (string_offset > offset+8 ? string_offset : offset+8);
+ if (0 == string_length) {
+ *end = *start;
+ if (ntlmssp_tree)
+ proto_tree_add_string(ntlmssp_tree, string_hf, tvb,
+ offset, 8, "NULL");
+ return offset+8;
+ }
+
+ bc = result_length = string_length;
+ string_text = get_unicode_or_ascii_string(tvb, &string_offset,
+ unicode_strings, &result_length,
+ FALSE, TRUE, &bc);
+
+ if (ntlmssp_tree) {
+ tf = proto_tree_add_string(ntlmssp_tree, string_hf, tvb,
+ string_offset, result_length, string_text);
+ tree = proto_item_add_subtree(tf, ett_ntlmssp_string);
+ }
+ proto_tree_add_uint(tree, hf_ntlmssp_string_len,
+ tvb, offset, 2, string_length);
+ offset += 2;
+ proto_tree_add_uint(tree, hf_ntlmssp_string_maxlen,
+ tvb, offset, 2, string_maxlen);
+ offset += 2;
+ proto_tree_add_uint(tree, hf_ntlmssp_string_offset,
+ tvb, offset, 4, string_offset);
+ offset += 4;
+
+ *end = string_offset + string_length;
+ return offset;
+}
+
+/* dissect a generic blob - header area contains:
+ two byte len
+ two byte maxlen
+ four byte offset of blob in data area
+ The function returns the offset at the end of the blob header,
+ but the 'end' parameter returns the offset of the end of the blob itself
+*/
+static int
+dissect_ntlmssp_blob (tvbuff_t *tvb, int offset,
+ proto_tree *ntlmssp_tree,
+ int blob_hf, int *end, ntlmssp_blob *result)
+{
+ proto_item *tf = NULL;
+ proto_tree *tree = NULL;
+ guint16 blob_length = tvb_get_letohs(tvb, offset);
+ guint16 blob_maxlen = tvb_get_letohs(tvb, offset+2);
+ guint32 blob_offset = tvb_get_letohl(tvb, offset+4);
+
+ if (0 == blob_length) {
+ *end = (blob_offset > ((guint)offset)+8 ? blob_offset : ((guint)offset)+8);
+ if (ntlmssp_tree)
+ proto_tree_add_text(ntlmssp_tree, tvb, offset, 8, "%s: Empty",
+ proto_registrar_get_name(blob_hf));
+ return offset+8;
+ }
+
+ if (ntlmssp_tree) {
+ tf = proto_tree_add_item (ntlmssp_tree, blob_hf, tvb,
+ blob_offset, blob_length, FALSE);
+ tree = proto_item_add_subtree(tf, ett_ntlmssp_blob);
+ }
+ proto_tree_add_uint(tree, hf_ntlmssp_blob_len,
+ tvb, offset, 2, blob_length);
+ offset += 2;
+ proto_tree_add_uint(tree, hf_ntlmssp_blob_maxlen,
+ tvb, offset, 2, blob_maxlen);
+ offset += 2;
+ proto_tree_add_uint(tree, hf_ntlmssp_blob_offset,
+ tvb, offset, 4, blob_offset);
+ offset += 4;
+
+ *end = blob_offset + blob_length;
+
+ if (result != NULL) {
+ result->length = blob_length;
+ memset(result->contents, 0, MAX_BLOB_SIZE);
+ if (blob_length < MAX_BLOB_SIZE)
+ tvb_memcpy(tvb, result->contents, blob_offset, blob_length);
+ }
+
+ /* If we are dissecting the NTLM response and it is a NTLMv2
+ response call the appropriate dissector. */
+
+ if (blob_hf == hf_ntlmssp_auth_ntresponse && blob_length > 24)
+ dissect_ntlmv2_response(tvb, tree, blob_offset, blob_length);
+
+ return offset;
+}
+
+static int
+dissect_ntlmssp_negotiate_flags (tvbuff_t *tvb, int offset,
+ proto_tree *ntlmssp_tree,
+ guint32 negotiate_flags)
+{
+ proto_tree *negotiate_flags_tree = NULL;
+ proto_item *tf = NULL;
+
+ if (ntlmssp_tree) {
+ tf = proto_tree_add_uint (ntlmssp_tree,
+ hf_ntlmssp_negotiate_flags,
+ tvb, offset, 4, negotiate_flags);
+ negotiate_flags_tree = proto_item_add_subtree (tf, ett_ntlmssp_negotiate_flags);
+ }
+
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_80000000,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_40000000,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_20000000,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_10000000,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_8000000,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_4000000,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_2000000,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_1000000,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_800000,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_400000,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_200000,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_100000,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_80000,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_40000,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_20000,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_10000,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_8000,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_4000,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_2000,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_1000,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_800,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_400,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_200,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_100,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_80,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_40,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_20,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_10,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_08,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_04,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_02,
+ tvb, offset, 4, negotiate_flags);
+ proto_tree_add_boolean (negotiate_flags_tree,
+ hf_ntlmssp_negotiate_flags_01,
+ tvb, offset, 4, negotiate_flags);
+
+ return (offset + 4);
+}
+
+
+static int
+dissect_ntlmssp_negotiate (tvbuff_t *tvb, int offset, proto_tree *ntlmssp_tree)
+{
+ guint32 negotiate_flags;
+ int start;
+ int workstation_end;
+ int domain_end;
+
+ /* NTLMSSP Negotiate Flags */
+ negotiate_flags = tvb_get_letohl (tvb, offset);
+ offset = dissect_ntlmssp_negotiate_flags (tvb, offset, ntlmssp_tree,
+ negotiate_flags);
+
+ offset = dissect_ntlmssp_string(tvb, offset, ntlmssp_tree, FALSE,
+ hf_ntlmssp_negotiate_domain,
+ &start, &workstation_end);
+ offset = dissect_ntlmssp_string(tvb, offset, ntlmssp_tree, FALSE,
+ hf_ntlmssp_negotiate_workstation,
+ &start, &domain_end);
+
+ /* XXX - two blobs after this one, sometimes? */
+
+ return MAX(workstation_end, domain_end);
+}
+
+
+static int
+dissect_ntlmssp_address_list (tvbuff_t *tvb, int offset,
+ proto_tree *ntlmssp_tree,
+ int *end)
+{
+ guint16 list_length = tvb_get_letohs(tvb, offset);
+ guint16 list_maxlen = tvb_get_letohs(tvb, offset+2);
+ guint32 list_offset = tvb_get_letohl(tvb, offset+4);
+ guint16 item_type, item_length;
+ guint32 item_offset;
+ proto_item *tf = NULL;
+ proto_tree *tree = NULL;
+ proto_item *addr_tf = NULL;
+ proto_tree *addr_tree = NULL;
+
+ /* the address list is just a blob */
+ if (0 == list_length) {
+ *end = (list_offset > ((guint)offset)+8 ? list_offset : ((guint)offset)+8);
+ if (ntlmssp_tree)
+ proto_tree_add_text(ntlmssp_tree, tvb, offset, 8,
+ "Address List: Empty");
+ return offset+8;
+ }
+
+ if (ntlmssp_tree) {
+ tf = proto_tree_add_item (ntlmssp_tree, hf_ntlmssp_address_list, tvb,
+ list_offset, list_length, FALSE);
+ tree = proto_item_add_subtree(tf, ett_ntlmssp_address_list);
+ }
+ proto_tree_add_uint(tree, hf_ntlmssp_address_list_len,
+ tvb, offset, 2, list_length);
+ offset += 2;
+ proto_tree_add_uint(tree, hf_ntlmssp_address_list_maxlen,
+ tvb, offset, 2, list_maxlen);
+ offset += 2;
+ proto_tree_add_uint(tree, hf_ntlmssp_address_list_offset,
+ tvb, offset, 4, list_offset);
+ offset += 4;
+
+ /* Now enumerate through the individual items in the list */
+ item_offset = list_offset;
+
+ while (item_offset < (list_offset + list_length)) {
+ const char *text=NULL;
+ guint32 content_offset;
+ guint16 content_length;
+ guint32 type_offset;
+ guint32 len_offset;
+
+ /* Content type */
+ type_offset = item_offset;
+ item_type = tvb_get_letohs(tvb, type_offset);
+
+ /* Content length */
+ len_offset = type_offset + 2;
+ content_length = tvb_get_letohs(tvb, len_offset);
+
+ /* Content value */
+ content_offset = len_offset + 2;
+ item_length = content_length + 4;
+
+ /* Strings are always in unicode regardless of the negotiated
+ string type. */
+ if (content_length > 0) {
+ guint16 bc;
+ int result_length;
+ int item_offset_int;
+
+ item_offset_int = content_offset;
+ bc = content_length;
+ text = get_unicode_or_ascii_string(tvb, &item_offset_int,
+ TRUE, &result_length,
+ FALSE, FALSE, &bc);
+ }
+
+ if (!text) text = ""; /* Make sure we don't blow up below */
+
+ switch(item_type) {
+ case NTLM_NAME_NB_HOST:
+ addr_tf = proto_tree_add_string(tree, hf_ntlmssp_address_list_server_nb,
+ tvb, item_offset, item_length, text);
+ break;
+ case NTLM_NAME_NB_DOMAIN:
+ addr_tf = proto_tree_add_string(tree, hf_ntlmssp_address_list_domain_nb,
+ tvb, item_offset, item_length, text);
+ break;
+ case NTLM_NAME_DNS_HOST:
+ addr_tf = proto_tree_add_string(tree, hf_ntlmssp_address_list_server_dns,
+ tvb, item_offset, item_length, text);
+ break;
+ case NTLM_NAME_DNS_DOMAIN:
+ addr_tf = proto_tree_add_string(tree, hf_ntlmssp_address_list_domain_dns,
+ tvb, item_offset, item_length, text);
+ break;
+ case NTLM_NAME_END:
+ addr_tf = proto_tree_add_item(tree, hf_ntlmssp_address_list_terminator,
+ tvb, item_offset, item_length, TRUE);
+ }
+
+ /* Now show the actual bytes that made up the summary line */
+ addr_tree = proto_item_add_subtree (addr_tf,
+ ett_ntlmssp_address_list_item);
+ proto_tree_add_item (addr_tree, hf_ntlmssp_address_list_item_type,
+ tvb, type_offset, 2, TRUE);
+ proto_tree_add_item (addr_tree, hf_ntlmssp_address_list_item_len,
+ tvb, len_offset, 2, TRUE);
+ if (content_length > 0) {
+ proto_tree_add_string(addr_tree, hf_ntlmssp_address_list_item_content,
+ tvb, content_offset, content_length, text);
+ }
+
+ item_offset += item_length;
+ }
+
+ *end = list_offset + list_length;
+ return offset;
+}
+
+static int
+dissect_ntlmssp_challenge (tvbuff_t *tvb, packet_info *pinfo, int offset,
+ proto_tree *ntlmssp_tree)
+{
+ guint32 negotiate_flags;
+ int item_start, item_end;
+ int data_start, data_end;
+ ntlmssp_info *conv_ntlmssp_info;
+ conversation_t *conversation;
+ gboolean unicode_strings = FALSE;
+ guint8 challenge[8];
+ guint8 sspkey[16]; /* NTLMSSP cipher key */
+ guint8 ssp_key_len; /* Either 8 or 16 (40 bit or 128) */
+
+ /* need to find unicode flag */
+ negotiate_flags = tvb_get_letohl (tvb, offset+8);
+ if (negotiate_flags & NTLMSSP_NEGOTIATE_UNICODE)
+ unicode_strings = TRUE;
+
+ /* Domain name */
+ offset = dissect_ntlmssp_string(tvb, offset, ntlmssp_tree, unicode_strings,
+ hf_ntlmssp_challenge_domain,
+ &item_start, &item_end);
+ data_start = item_start;
+ data_end = item_end;
+
+ /* NTLMSSP Negotiate Flags */
+ offset = dissect_ntlmssp_negotiate_flags (tvb, offset, ntlmssp_tree,
+ negotiate_flags);
+
+ /* NTLMSSP NT Lan Manager Challenge */
+ proto_tree_add_item (ntlmssp_tree,
+ hf_ntlmssp_ntlm_challenge,
+ tvb, offset, 8, FALSE);
+
+ /*
+ * Store the flags and the RC4 state information with the conversation,
+ * as they're needed in order to dissect subsequent messages.
+ */
+ conversation = find_conversation(&pinfo->src, &pinfo->dst,
+ pinfo->ptype, pinfo->srcport,
+ pinfo->destport, 0);
+ if (!conversation) { /* Create one */
+ conversation = conversation_new(&pinfo->src, &pinfo->dst, pinfo->ptype,
+ pinfo->srcport, pinfo->destport, 0);
+ }
+
+ if (!conversation_get_proto_data(conversation, proto_ntlmssp)) {
+ conv_ntlmssp_info = g_mem_chunk_alloc(ntlmssp_info_chunk);
+ /* Insert the flags into the conversation */
+ conv_ntlmssp_info->flags = negotiate_flags;
+ /* Insert the RC4 state information into the conversation */
+ tvb_memcpy(tvb, challenge, offset, 8);
+
+ /* Between the challenge and the user provided password, we can build the
+ NTLMSSP key and initialize the cipher */
+ if (conv_ntlmssp_info->flags & NTLMSSP_NEGOTIATE_128) {
+ create_ntlmssp_v1_key(nt_password, challenge, 1, sspkey);
+ ssp_key_len = 16;
+ }
+ else {
+ create_ntlmssp_v1_key(nt_password, challenge, 0, sspkey);
+ ssp_key_len = 8;
+ }
+ crypt_rc4_init(&conv_ntlmssp_info->rc4_state_peer1, sspkey, ssp_key_len);
+ crypt_rc4_init(&conv_ntlmssp_info->rc4_state_peer2, sspkey, ssp_key_len);
+ conv_ntlmssp_info->peer1_dest_port = pinfo->destport;
+ conv_ntlmssp_info->rc4_state_initialized = 1;
+
+ conversation_add_proto_data(conversation, proto_ntlmssp, conv_ntlmssp_info);
+ }
+ offset += 8;
+
+ /* Reserved (function not completely known) */
+ /* XXX - SSP key? */
+ proto_tree_add_item (ntlmssp_tree, hf_ntlmssp_reserved,
+ tvb, offset, 8, FALSE);
+ offset += 8;
+
+ /*
+ * The presence or absence of this field is not obviously correlated
+ * with any flags in the previous NEGOTIATE message or in this
+ * message (other than the "Workstation Supplied" and "Domain
+ * Supplied" flags in the NEGOTIATE message, at least in the capture
+ * I've seen - but those also correlate with the presence of workstation
+ * and domain name fields, so it doesn't seem to make sense that they
+ * actually *indicate* whether the subsequent CHALLENGE has an
+ * address list).
+ */
+ if (offset < data_start) {
+ offset = dissect_ntlmssp_address_list(tvb, offset, ntlmssp_tree, &item_end);
+ data_end = MAX(data_end, item_end);
+ }
+
+ return MAX(offset, data_end);
+}
+
+static int
+dissect_ntlmssp_auth (tvbuff_t *tvb, packet_info *pinfo, int offset,
+ proto_tree *ntlmssp_tree)
+{
+ int item_start, item_end;
+ int data_start, data_end = 0;
+ guint32 negotiate_flags;
+ gboolean unicode_strings = FALSE;
+ ntlmssp_info *conv_ntlmssp_info;
+ conversation_t *conversation;
+
+ /*
+ * Get flag info from the original negotiate message, if any.
+ * This is because the flag information is sometimes missing from
+ * the AUTHENTICATE message, so we can't figure out whether
+ * strings are Unicode or not by looking at *our* flags.
+ */
+ conv_ntlmssp_info = p_get_proto_data(pinfo->fd, proto_ntlmssp);
+ if (conv_ntlmssp_info == NULL) {
+ /*
+ * There isn't any. Is there any from this conversation? If so,
+ * it means this is the first time we've dissected this frame, so
+ * we should give it flag info.
+ */
+ conversation = find_conversation(&pinfo->src, &pinfo->dst,
+ pinfo->ptype, pinfo->srcport,
+ pinfo->destport, 0);
+ if (conversation != NULL) {
+ conv_ntlmssp_info = conversation_get_proto_data(conversation, proto_ntlmssp);
+ if (conv_ntlmssp_info != NULL) {
+ /*
+ * We have flag info; attach it to the frame.
+ */
+ p_add_proto_data(pinfo->fd, proto_ntlmssp, conv_ntlmssp_info);
+ }
+ }
+ }
+ if (conv_ntlmssp_info != NULL) {
+ if (conv_ntlmssp_info->flags & NTLMSSP_NEGOTIATE_UNICODE)
+ unicode_strings = TRUE;
+ }
+
+ /*
+ * Sometimes the session key and flags are missing.
+ * Sometimes the session key is present but the flags are missing.
+ * Sometimes they're both present.
+ *
+ * This does not correlate with any flags in the previous CHALLENGE
+ * message, and only correlates with "Negotiate Unicode", "Workstation
+ * Supplied", and "Domain Supplied" in the NEGOTIATE message - but
+ * those don't make sense as flags to use to determine this.
+ *
+ * So we check all of the descriptors to figure out where the data
+ * area begins, and if the session key or the flags would be in the
+ * middle of the data area, we assume the field in question is
+ * missing.
+ */
+
+ /* Lan Manager response */
+ data_start = tvb_get_letohl(tvb, offset+4);
+ offset = dissect_ntlmssp_blob(tvb, offset, ntlmssp_tree,
+ hf_ntlmssp_auth_lmresponse,
+ &item_end,
+ conv_ntlmssp_info == NULL ? NULL :
+ &conv_ntlmssp_info->lm_response);
+ data_end = MAX(data_end, item_end);
+
+ /* NTLM response */
+ item_start = tvb_get_letohl(tvb, offset+4);
+ offset = dissect_ntlmssp_blob(tvb, offset, ntlmssp_tree,
+ hf_ntlmssp_auth_ntresponse,
+ &item_end,
+ conv_ntlmssp_info == NULL ? NULL :
+ &conv_ntlmssp_info->ntlm_response);
+ data_start = MIN(data_start, item_start);
+ data_end = MAX(data_end, item_end);
+
+ /* domain name */
+ item_start = tvb_get_letohl(tvb, offset+4);
+ offset = dissect_ntlmssp_string(tvb, offset, ntlmssp_tree,
+ unicode_strings,
+ hf_ntlmssp_auth_domain,
+ &item_start, &item_end);
+ data_start = MIN(data_start, item_start);
+ data_end = MAX(data_end, item_end);
+
+ /* user name */
+ item_start = tvb_get_letohl(tvb, offset+4);
+ offset = dissect_ntlmssp_string(tvb, offset, ntlmssp_tree,
+ unicode_strings,
+ hf_ntlmssp_auth_username,
+ &item_start, &item_end);
+ data_start = MIN(data_start, item_start);
+ data_end = MAX(data_end, item_end);
+
+ /* hostname */
+ item_start = tvb_get_letohl(tvb, offset+4);
+ offset = dissect_ntlmssp_string(tvb, offset, ntlmssp_tree,
+ unicode_strings,
+ hf_ntlmssp_auth_hostname,
+ &item_start, &item_end);
+ data_start = MIN(data_start, item_start);
+ data_end = MAX(data_end, item_end);
+
+ if (offset < data_start) {
+ /* Session Key */
+ offset = dissect_ntlmssp_blob(tvb, offset, ntlmssp_tree,
+ hf_ntlmssp_auth_sesskey,
+ &item_end, NULL);
+ data_end = MAX(data_end, item_end);
+ }
+
+ if (offset < data_start) {
+ /* NTLMSSP Negotiate Flags */
+ negotiate_flags = tvb_get_letohl (tvb, offset);
+ offset = dissect_ntlmssp_negotiate_flags (tvb, offset, ntlmssp_tree,
+ negotiate_flags);
+ }
+
+ return MAX(offset, data_end);
+}
+
+static void
+dissect_ntlmssp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+ guint32 ntlmssp_message_type;
+ volatile int offset = 0;
+ proto_tree *volatile ntlmssp_tree = NULL;
+ proto_item *tf = NULL;
+
+ /* Setup a new tree for the NTLMSSP payload */
+ if (tree) {
+ tf = proto_tree_add_item (tree,
+ hf_ntlmssp,
+ tvb, offset, -1, FALSE);
+
+ ntlmssp_tree = proto_item_add_subtree (tf,
+ ett_ntlmssp);
+ }
+
+ /*
+ * Catch the ReportedBoundsError exception; the stuff we've been
+ * handed doesn't necessarily run to the end of the packet, it's
+ * an item inside a packet, so if it happens to be malformed (or
+ * we, or a dissector we call, has a bug), so that an exception
+ * is thrown, we want to report the error, but return and let
+ * our caller dissect the rest of the packet.
+ *
+ * If it gets a BoundsError, we can stop, as there's nothing more
+ * in the packet after our blob to see, so we just re-throw the
+ * exception.
+ */
+ TRY {
+ /* NTLMSSP constant */
+ proto_tree_add_item (ntlmssp_tree, hf_ntlmssp_auth,
+ tvb, offset, 8, FALSE);
+ offset += 8;
+
+ /* NTLMSSP Message Type */
+ proto_tree_add_item (ntlmssp_tree, hf_ntlmssp_message_type,
+ tvb, offset, 4, TRUE);
+ ntlmssp_message_type = tvb_get_letohl (tvb, offset);
+ offset += 4;
+
+ if (check_col(pinfo->cinfo, COL_INFO))
+ col_append_fstr(pinfo->cinfo, COL_INFO, ", %s",
+ val_to_str(ntlmssp_message_type,
+ ntlmssp_message_types,
+ "Unknown message type"));
+
+ /* Call the appropriate dissector based on the Message Type */
+ switch (ntlmssp_message_type) {
+
+ case NTLMSSP_NEGOTIATE:
+ offset = dissect_ntlmssp_negotiate (tvb, offset, ntlmssp_tree);
+ break;
+
+ case NTLMSSP_CHALLENGE:
+ offset = dissect_ntlmssp_challenge (tvb, pinfo, offset, ntlmssp_tree);
+ break;
+
+ case NTLMSSP_AUTH:
+ offset = dissect_ntlmssp_auth (tvb, pinfo, offset, ntlmssp_tree);
+ break;
+
+ default:
+ /* Unrecognized message type */
+ proto_tree_add_text (ntlmssp_tree, tvb, offset, -1,
+ "Unrecognized NTLMSSP Message");
+ break;
+ }
+ } CATCH(BoundsError) {
+ RETHROW;
+ } CATCH(ReportedBoundsError) {
+ show_reported_bounds_error(tvb, pinfo, tree);
+ } ENDTRY;
+}
+
+/*
+ * Get the encryption state tied to this conversation. cryptpeer indicates
+ * whether to retrieve the data for peer1 or peer2.
+ */
+static rc4_state_struct *
+get_encrypted_state(packet_info *pinfo, int cryptpeer)
+{
+ conversation_t *conversation;
+ ntlmssp_info *conv_ntlmssp_info;
+
+ conversation = find_conversation(&pinfo->src, &pinfo->dst,
+ pinfo->ptype, pinfo->srcport,
+ pinfo->destport, 0);
+ if (conversation == NULL) {
+ /* We don't have a conversation. In this case, stop processing
+ because we do not have enough info to decrypt the payload */
+ return NULL;
+ }
+ else {
+ /* We have a conversation, check for encryption state */
+ conv_ntlmssp_info = conversation_get_proto_data(conversation,
+ proto_ntlmssp);
+ if (conv_ntlmssp_info == NULL) {
+ /* No encryption state tied to the conversation. Therefore, we
+ cannot decrypt the payload */
+ return NULL;
+ }
+ else {
+ /* We have the encryption state in the conversation. So return the
+ crypt state tied to the requested peer
+ */
+ if (cryptpeer == 1) {
+ return &conv_ntlmssp_info->rc4_state_peer1;
+ } else {
+ return &conv_ntlmssp_info->rc4_state_peer2;
+ }
+ }
+ }
+ return NULL;
+}
+
+/*
+ * See page 45 of "DCE/RPC over SMB" by Luke Kenneth Casson Leighton.
+ */
+static void
+decrypt_verifier(tvbuff_t *tvb, int offset, guint32 encrypted_block_length,
+ packet_info *pinfo, proto_tree *tree)
+{
+ proto_tree *decr_tree = NULL;
+ proto_item *tf = NULL;
+ conversation_t *conversation;
+ rc4_state_struct *rc4_state;
+ rc4_state_struct *rc4_state_peer;
+ tvbuff_t *decr_tvb; /* Used to display decrypted buffer */
+ guint8 *peer_block;
+ ntlmssp_info *conv_ntlmssp_info = NULL;
+ ntlmssp_packet_info *packet_ntlmssp_info = NULL;
+ int decrypted_offset = 0;
+
+ packet_ntlmssp_info = p_get_proto_data(pinfo->fd, proto_ntlmssp);
+ if (packet_ntlmssp_info == NULL) {
+ /* We don't have data for this packet */
+ return;
+ }
+ if (!packet_ntlmssp_info->verifier_decrypted) {
+ conversation = find_conversation(&pinfo->src, &pinfo->dst,
+ pinfo->ptype, pinfo->srcport,
+ pinfo->destport, 0);
+ if (conversation == NULL) {
+ /* There is no conversation, thus no encryption state */
+ return;
+ }
+
+ conv_ntlmssp_info = conversation_get_proto_data(conversation,
+ proto_ntlmssp);
+ if (conv_ntlmssp_info == NULL) {
+ /* There is no NTLMSSP state tied to the conversation */
+ return;
+ }
+ if (conv_ntlmssp_info->rc4_state_initialized != 1 ) {
+ /* The crypto sybsystem is not initialized. This means that either
+ the conversation did not include a challenge, or we are doing
+ something other than NTLMSSP v1 */
+ return;
+ }
+
+ if (conv_ntlmssp_info->peer1_dest_port == pinfo->destport) {
+ rc4_state = get_encrypted_state(pinfo, 1);
+ rc4_state_peer = get_encrypted_state(pinfo, 0);
+ } else {
+ rc4_state = get_encrypted_state(pinfo, 0);
+ rc4_state_peer = get_encrypted_state(pinfo, 1);
+ }
+
+ if (rc4_state == NULL || rc4_state_peer == NULL) {
+ /* There is no encryption state, so we cannot decrypt */
+ return;
+ }
+
+ /* Setup the buffer to decrypt to */
+ tvb_memcpy(tvb, packet_ntlmssp_info->verifier,
+ offset, encrypted_block_length);
+
+ /* Do the actual decryption of the verifier */
+ crypt_rc4(rc4_state, packet_ntlmssp_info->verifier,
+ encrypted_block_length);
+
+ /* We setup a temporary buffer so we can re-encrypt the payload after
+ decryption. This is to update the opposite peer's RC4 state */
+ peer_block = g_malloc(encrypted_block_length);
+ memcpy(peer_block, packet_ntlmssp_info->verifier,
+ encrypted_block_length);
+ crypt_rc4(rc4_state_peer, peer_block, encrypted_block_length);
+ g_free(peer_block);
+
+ /* Mark the packet as decrypted so that subsequent attempts to dissect
+ the packet use the already decrypted payload instead of attempting
+ to decrypt again */
+ packet_ntlmssp_info->verifier_decrypted = TRUE;
+ }
+
+ /* Show the decrypted buffer in a new window */
+ decr_tvb = tvb_new_real_data(packet_ntlmssp_info->verifier,
+ encrypted_block_length,
+ encrypted_block_length);
+ tvb_set_child_real_data_tvbuff(tvb, decr_tvb);
+ add_new_data_source(pinfo, decr_tvb,
+ "Decrypted NTLMSSP Verifier");
+
+ /* Show the decrypted payload in the tree */
+ tf = proto_tree_add_text(tree, decr_tvb, 0, -1,
+ "Decrypted Verifier (%d byte%s)",
+ encrypted_block_length,
+ plurality(encrypted_block_length, "", "s"));
+ decr_tree = proto_item_add_subtree (tf, ett_ntlmssp);
+
+ /* LKCL page 45 says this is a "reserved" field. I'm not sure if it's
+ garbage because it's some sort of nonce, or because there is a problem
+ with the verifier decryption routine. */
+ proto_tree_add_item (decr_tree, hf_ntlmssp_verf_unknown1,
+ decr_tvb, decrypted_offset, 4, TRUE);
+ decrypted_offset += 4;
+
+ /* CRC32 of the DCE fragment data */
+ proto_tree_add_item (decr_tree, hf_ntlmssp_verf_crc32,
+ decr_tvb, decrypted_offset, 4, TRUE);
+ decrypted_offset += 4;
+
+ /* Incrementing sequence number of DCE conversation */
+ proto_tree_add_item (decr_tree, hf_ntlmssp_verf_sequence,
+ decr_tvb, decrypted_offset, 4, TRUE);
+ decrypted_offset += 4;
+}
+
+static int
+dissect_ntlmssp_verf(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+ volatile int offset = 0;
+ proto_tree *volatile ntlmssp_tree = NULL;
+ proto_item *tf = NULL;
+ guint32 verifier_length;
+ guint32 encrypted_block_length;
+
+ verifier_length = tvb_length_remaining (tvb, offset);
+ encrypted_block_length = verifier_length - 4;
+
+ if (encrypted_block_length < 12) {
+ /* Don't know why this would happen, but if it does, don't even bother
+ attempting decryption/dissection */
+ return offset + verifier_length;
+ }
+
+ /* Setup a new tree for the NTLMSSP payload */
+ if (tree) {
+ tf = proto_tree_add_item (tree,
+ hf_ntlmssp_verf,
+ tvb, offset, -1, FALSE);
+
+ ntlmssp_tree = proto_item_add_subtree (tf,
+ ett_ntlmssp);
+ }
+
+ /*
+ * Catch the ReportedBoundsError exception; the stuff we've been
+ * handed doesn't necessarily run to the end of the packet, it's
+ * an item inside a packet, so if it happens to be malformed (or
+ * we, or a dissector we call, has a bug), so that an exception
+ * is thrown, we want to report the error, but return and let
+ * our caller dissect the rest of the packet.
+ *
+ * If it gets a BoundsError, we can stop, as there's nothing more
+ * in the packet after our blob to see, so we just re-throw the
+ * exception.
+ */
+ TRY {
+ /* Version number */
+ proto_tree_add_item (ntlmssp_tree, hf_ntlmssp_verf_vers,
+ tvb, offset, 4, TRUE);
+ offset += 4;
+
+ /* Encrypted body */
+ proto_tree_add_item (ntlmssp_tree, hf_ntlmssp_verf_body,
+ tvb, offset, encrypted_block_length, TRUE);
+
+ /* Try to decrypt */
+ decrypt_verifier (tvb, offset, encrypted_block_length, pinfo, ntlmssp_tree);
+
+ offset += encrypted_block_length;
+ } CATCH(BoundsError) {
+ RETHROW;
+ } CATCH(ReportedBoundsError) {
+ show_reported_bounds_error(tvb, pinfo, tree);
+ } ENDTRY;
+
+ return offset;
+}
+
+static tvbuff_t *
+dissect_ntlmssp_encrypted_payload(tvbuff_t *tvb, int offset,
+ packet_info *pinfo,
+ dcerpc_auth_info *auth_info _U_)
+{
+ tvbuff_t *decr_tvb; /* Used to display decrypted buffer */
+ guint8 *peer_block;
+ conversation_t *conversation;
+ guint32 encrypted_block_length;
+ rc4_state_struct *rc4_state;
+ rc4_state_struct *rc4_state_peer;
+ ntlmssp_info *conv_ntlmssp_info = NULL;
+ ntlmssp_packet_info *packet_ntlmssp_info = NULL;
+
+ encrypted_block_length = tvb_length_remaining (tvb, offset);
+
+ /* Check to see if we already have state for this packet */
+ packet_ntlmssp_info = p_get_proto_data(pinfo->fd, proto_ntlmssp);
+ if (packet_ntlmssp_info == NULL) {
+ /* We don't have any packet state, so create one */
+ packet_ntlmssp_info = g_mem_chunk_alloc(ntlmssp_packet_info_chunk);
+ memset(packet_ntlmssp_info, 0, sizeof(ntlmssp_packet_info));
+ p_add_proto_data(pinfo->fd, proto_ntlmssp, packet_ntlmssp_info);
+ }
+
+ if (!packet_ntlmssp_info->payload_decrypted) {
+ /* Pull the challenge info from the conversation */
+ conversation = find_conversation(&pinfo->src, &pinfo->dst,
+ pinfo->ptype, pinfo->srcport,
+ pinfo->destport, 0);
+ if (conversation == NULL) {
+ /* There is no conversation, thus no encryption state */
+ return NULL;
+ }
+
+ conv_ntlmssp_info = conversation_get_proto_data(conversation,
+ proto_ntlmssp);
+ if (conv_ntlmssp_info == NULL) {
+ /* There is no NTLMSSP state tied to the conversation */
+ return NULL;
+ }
+
+ /* Get the pair of RC4 state structures. One is used for to decrypt the
+ payload. The other is used to re-encrypt the payload to represent
+ the peer */
+ if (conv_ntlmssp_info->peer1_dest_port == pinfo->destport) {
+ rc4_state = get_encrypted_state(pinfo, 1);
+ rc4_state_peer = get_encrypted_state(pinfo, 0);
+ } else {
+ rc4_state = get_encrypted_state(pinfo, 0);
+ rc4_state_peer = get_encrypted_state(pinfo, 1);
+ }
+
+ if (rc4_state == NULL || rc4_state_peer == NULL) {
+ /* There is no encryption state, so we cannot decrypt */
+ return NULL;
+ }
+
+ /* Store the decrypted contents in the packet state struct
+ (of course at this point, they aren't decrypted yet) */
+ packet_ntlmssp_info->decrypted_payload = tvb_memdup(tvb, offset,
+ encrypted_block_length);
+ decrypted_payloads = g_slist_prepend(decrypted_payloads,
+ packet_ntlmssp_info->decrypted_payload);
+
+ /* Do the decryption of the payload */
+ crypt_rc4(rc4_state, packet_ntlmssp_info->decrypted_payload,
+ encrypted_block_length);
+
+ /* We setup a temporary buffer so we can re-encrypt the payload after
+ decryption. This is to update the opposite peer's RC4 state */
+ peer_block = g_malloc(encrypted_block_length);
+ memcpy(peer_block, packet_ntlmssp_info->decrypted_payload,
+ encrypted_block_length);
+ crypt_rc4(rc4_state_peer, peer_block, encrypted_block_length);
+ g_free(peer_block);
+
+ packet_ntlmssp_info->payload_decrypted = TRUE;
+ }
+
+ /* Show the decrypted buffer in a new window */
+ decr_tvb = tvb_new_real_data(packet_ntlmssp_info->decrypted_payload,
+ encrypted_block_length,
+ encrypted_block_length);
+
+ tvb_set_child_real_data_tvbuff(tvb, decr_tvb);
+
+ offset += encrypted_block_length;
+
+ return decr_tvb;
+}
+
+static void
+free_payload(gpointer decrypted_payload, gpointer user_data _U_)
+{
+ g_free(decrypted_payload);
+}
+
+static void
+ntlmssp_init_protocol(void)
+{
+ if (ntlmssp_info_chunk != NULL)
+ g_mem_chunk_destroy(ntlmssp_info_chunk);
+ if (ntlmssp_packet_info_chunk != NULL)
+ g_mem_chunk_destroy(ntlmssp_packet_info_chunk);
+
+ /*
+ * Free the decrypted payloads, and then free the list of decrypted
+ * payloads.
+ */
+ if (decrypted_payloads != NULL) {
+ g_slist_foreach(decrypted_payloads, free_payload, NULL);
+ g_slist_free(decrypted_payloads);
+ decrypted_payloads = NULL;
+ }
+
+ ntlmssp_info_chunk = g_mem_chunk_new("ntlmssp_info_chunk",
+ sizeof(ntlmssp_info),
+ ntlmssp_info_count * sizeof(ntlmssp_info),
+ G_ALLOC_ONLY);
+ ntlmssp_packet_info_chunk = g_mem_chunk_new("ntlmssp_packet_info_chunk",
+ sizeof(ntlmssp_packet_info),
+ ntlmssp_packet_info_count * sizeof(ntlmssp_packet_info),
+ G_ALLOC_ONLY);
+}
+
+void
+proto_register_ntlmssp(void)
+{
+
+ static hf_register_info hf[] = {
+ { &hf_ntlmssp,
+ { "NTLMSSP", "ntlmssp", FT_NONE, BASE_NONE, NULL, 0x0, "NTLMSSP", HFILL }},
+
+ { &hf_ntlmssp_auth,
+ { "NTLMSSP identifier", "ntlmssp.identifier", FT_STRING, BASE_NONE, NULL, 0x0, "NTLMSSP Identifier", HFILL }},
+
+ { &hf_ntlmssp_message_type,
+ { "NTLM Message Type", "ntlmssp.messagetype", FT_UINT32, BASE_HEX, VALS(ntlmssp_message_types), 0x0, "", HFILL }},
+
+ { &hf_ntlmssp_negotiate_flags,
+ { "Flags", "ntlmssp.negotiateflags", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_01,
+
+ { "Negotiate UNICODE", "ntlmssp.negotiateunicode", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_UNICODE, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_02,
+ { "Negotiate OEM", "ntlmssp.negotiateoem", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_OEM, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_04,
+ { "Request Target", "ntlmssp.requesttarget", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_REQUEST_TARGET, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_08,
+ { "Request 0x00000008", "ntlmssp.negotiate00000008", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_00000008, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_10,
+ { "Negotiate Sign", "ntlmssp.negotiatesign", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_SIGN, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_20,
+ { "Negotiate Seal", "ntlmssp.negotiateseal", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_SEAL, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_40,
+ { "Negotiate Datagram Style", "ntlmssp.negotiatedatagramstyle", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_DATAGRAM_STYLE, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_80,
+ { "Negotiate Lan Manager Key", "ntlmssp.negotiatelmkey", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_LM_KEY, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_100,
+ { "Negotiate Netware", "ntlmssp.negotiatenetware", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_NETWARE, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_200,
+ { "Negotiate NTLM key", "ntlmssp.negotiatentlm", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_NTLM, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_400,
+ { "Negotiate 0x00000400", "ntlmssp.negotiate00000400", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_00000400, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_800,
+ { "Negotiate 0x00000800", "ntlmssp.negotiate00000800", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_00000800, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_1000,
+ { "Negotiate Domain Supplied", "ntlmssp.negotiatedomainsupplied", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_2000,
+ { "Negotiate Workstation Supplied", "ntlmssp.negotiateworkstationsupplied", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_4000,
+ { "Negotiate This is Local Call", "ntlmssp.negotiatethisislocalcall", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_8000,
+ { "Negotiate Always Sign", "ntlmssp.negotiatealwayssign", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_ALWAYS_SIGN, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_10000,
+ { "Negotiate Challenge Init Response", "ntlmssp.negotiatechallengeinitresponse", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_CHAL_INIT_RESPONSE, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_20000,
+ { "Negotiate Challenge Accept Response", "ntlmssp.negotiatechallengeacceptresponse", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_CHAL_ACCEPT_RESPONSE, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_40000,
+ { "Negotiate Challenge Non NT Session Key", "ntlmssp.negotiatechallengenonntsessionkey", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_CHAL_NON_NT_SESSION_KEY, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_80000,
+ { "Negotiate NTLM2 key", "ntlmssp.negotiatentlm2", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_NTLM2, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_100000,
+ { "Negotiate 0x00100000", "ntlmssp.negotiatent00100000", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_00100000, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_200000,
+ { "Negotiate 0x00200000", "ntlmssp.negotiatent00200000", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_00200000, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_400000,
+ { "Negotiate 0x00400000", "ntlmssp.negotiatent00400000", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_00400000, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_800000,
+ { "Negotiate Target Info", "ntlmssp.negotiatetargetinfo", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_CHAL_TARGET_INFO, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_1000000,
+ { "Negotiate 0x01000000", "ntlmssp.negotiatent01000000", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_01000000, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_2000000,
+ { "Negotiate 0x02000000", "ntlmssp.negotiatent02000000", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_02000000, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_4000000,
+ { "Negotiate 0x04000000", "ntlmssp.negotiatent04000000", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_04000000, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_8000000,
+ { "Negotiate 0x08000000", "ntlmssp.negotiatent08000000", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_08000000, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_10000000,
+ { "Negotiate 0x10000000", "ntlmssp.negotiatent10000000", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_10000000, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_20000000,
+ { "Negotiate 128", "ntlmssp.negotiate128", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_128, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_40000000,
+ { "Negotiate Key Exchange", "ntlmssp.negotiatekeyexch", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_KEY_EXCH, "", HFILL }},
+ { &hf_ntlmssp_negotiate_flags_80000000,
+ { "Negotiate 0x80000000", "ntlmssp.negotiatent80000000", FT_BOOLEAN, 32, TFS (&flags_set_truth), NTLMSSP_NEGOTIATE_80000000, "", HFILL }},
+ { &hf_ntlmssp_negotiate_workstation_strlen,
+ { "Calling workstation name length", "ntlmssp.negotiate.callingworkstation.strlen", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_negotiate_workstation_maxlen,
+ { "Calling workstation name max length", "ntlmssp.negotiate.callingworkstation.maxlen", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_negotiate_workstation_buffer,
+ { "Calling workstation name buffer", "ntlmssp.negotiate.callingworkstation.buffer", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_negotiate_workstation,
+ { "Calling workstation name", "ntlmssp.negotiate.callingworkstation", FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_negotiate_domain_strlen,
+ { "Calling workstation domain length", "ntlmssp.negotiate.domain.strlen", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_negotiate_domain_maxlen,
+ { "Calling workstation domain max length", "ntlmssp.negotiate.domain.maxlen", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_negotiate_domain_buffer,
+ { "Calling workstation domain buffer", "ntlmssp.negotiate.domain.buffer", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_negotiate_domain,
+ { "Calling workstation domain", "ntlmssp.negotiate.domain", FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_ntlm_challenge,
+ { "NTLM Challenge", "ntlmssp.ntlmchallenge", FT_BYTES, BASE_HEX, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_reserved,
+ { "Reserved", "ntlmssp.reserved", FT_BYTES, BASE_HEX, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_challenge_domain,
+ { "Domain", "ntlmssp.challenge.domain", FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_auth_domain,
+ { "Domain name", "ntlmssp.auth.domain", FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_auth_username,
+ { "User name", "ntlmssp.auth.username", FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_auth_hostname,
+ { "Host name", "ntlmssp.auth.hostname", FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_auth_lmresponse,
+ { "Lan Manager Response", "ntlmssp.auth.lmresponse", FT_BYTES, BASE_HEX, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_auth_ntresponse,
+ { "NTLM Response", "ntlmssp.auth.ntresponse", FT_BYTES, BASE_HEX, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_auth_sesskey,
+ { "Session Key", "ntlmssp.auth.sesskey", FT_BYTES, BASE_HEX, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_string_len,
+ { "Length", "ntlmssp.string.length", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL}},
+ { &hf_ntlmssp_string_maxlen,
+ { "Maxlen", "ntlmssp.string.maxlen", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL}},
+ { &hf_ntlmssp_string_offset,
+ { "Offset", "ntlmssp.string.offset", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL}},
+ { &hf_ntlmssp_blob_len,
+ { "Length", "ntlmssp.blob.length", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL}},
+ { &hf_ntlmssp_blob_maxlen,
+ { "Maxlen", "ntlmssp.blob.maxlen", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL}},
+ { &hf_ntlmssp_blob_offset,
+ { "Offset", "ntlmssp.blob.offset", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL}},
+ { &hf_ntlmssp_address_list,
+ { "Address List", "ntlmssp.challenge.addresslist", FT_NONE, BASE_NONE, NULL, 0x0, "", HFILL}},
+ { &hf_ntlmssp_address_list_len,
+ { "Length", "ntlmssp.challenge.addresslist.length", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL}},
+ { &hf_ntlmssp_address_list_maxlen,
+ { "Maxlen", "ntlmssp.challenge.addresslist.maxlen", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL}},
+ { &hf_ntlmssp_address_list_offset,
+ { "Offset", "ntlmssp.challenge.addresslist.offset", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL}},
+ { &hf_ntlmssp_address_list_item_type,
+ { "Target item type", "ntlmssp.targetitemtype", FT_UINT16, BASE_HEX, VALS(ntlm_name_types), 0x0, "", HFILL }},
+ { &hf_ntlmssp_address_list_item_len,
+ { "Target item Length", "ntlmssp.challenge.addresslist.item.length", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL}},
+ { &hf_ntlmssp_address_list_item_content,
+ { "Target item Content", "ntlmssp.challenge.addresslist.item.content", FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL}},
+ { &hf_ntlmssp_address_list_server_nb,
+ { "Server NetBIOS Name", "ntlmssp.challenge.addresslist.servernb", FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_address_list_domain_nb,
+ { "Domain NetBIOS Name", "ntlmssp.challenge.addresslist.domainnb", FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_address_list_server_dns,
+ { "Server DNS Name", "ntlmssp.challenge.addresslist.serverdns", FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_address_list_domain_dns,
+ { "Domain DNS Name", "ntlmssp.challenge.addresslist.domaindns", FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_address_list_terminator,
+ { "List Terminator", "ntlmssp.challenge.addresslist.terminator", FT_NONE, BASE_NONE, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_verf,
+ { "NTLMSSP Verifier", "ntlmssp.verf", FT_NONE, BASE_NONE, NULL, 0x0, "NTLMSSP Verifier", HFILL }},
+ { &hf_ntlmssp_verf_vers,
+ { "Version Number", "ntlmssp.verf.vers", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_verf_body,
+ { "Verifier Body", "ntlmssp.verf.body", FT_BYTES, BASE_NONE, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_decrypted_payload,
+ { "NTLM Decrypted Payload", "ntlmssp.decrypted_payload", FT_BYTES, BASE_HEX, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_verf_unknown1,
+ { "Unknown 1", "ntlmssp.verf.unknown1", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_verf_crc32,
+ { "Verifier CRC32", "ntlmssp.verf.crc32", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL }},
+ { &hf_ntlmssp_verf_sequence,
+ { "Verifier Sequence Number", "ntlmssp.verf.sequence", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }}
+ };
+
+
+ static gint *ett[] = {
+ &ett_ntlmssp,
+ &ett_ntlmssp_negotiate_flags,
+ &ett_ntlmssp_string,
+ &ett_ntlmssp_blob,
+ &ett_ntlmssp_address_list,
+ &ett_ntlmssp_address_list_item
+ };
+ module_t *ntlmssp_module;
+
+ proto_ntlmssp = proto_register_protocol (
+ "NTLM Secure Service Provider", /* name */
+ "NTLMSSP", /* short name */
+ "ntlmssp" /* abbrev */
+ );
+ proto_register_field_array (proto_ntlmssp, hf, array_length (hf));
+ proto_register_subtree_array (ett, array_length (ett));
+ register_init_routine(&ntlmssp_init_protocol);
+
+ ntlmssp_module = prefs_register_protocol(proto_ntlmssp, NULL);
+
+ prefs_register_string_preference(ntlmssp_module, "nt_password",
+ "NT Password",
+ "NT Password (used to decrypt payloads)",
+ &nt_password);
+
+ register_dissector("ntlmssp", dissect_ntlmssp, proto_ntlmssp);
+ new_register_dissector("ntlmssp_verf", dissect_ntlmssp_verf, proto_ntlmssp);
+}
+
+static int wrap_dissect_ntlmssp(tvbuff_t *tvb, int offset, packet_info *pinfo,
+ proto_tree *tree, guint8 *drep _U_)
+{
+ tvbuff_t *auth_tvb;
+
+ auth_tvb = tvb_new_subset(
+ tvb, offset, tvb_length_remaining(tvb, offset),
+ tvb_length_remaining(tvb, offset));
+
+ dissect_ntlmssp(auth_tvb, pinfo, tree);
+
+ return tvb_length_remaining(tvb, offset);
+}
+
+static int wrap_dissect_ntlmssp_verf(tvbuff_t *tvb, int offset, packet_info *pinfo,
+ proto_tree *tree, guint8 *drep _U_)
+{
+ tvbuff_t *auth_tvb;
+
+ auth_tvb = tvb_new_subset(
+ tvb, offset, tvb_length_remaining(tvb, offset),
+ tvb_length_remaining(tvb, offset));
+
+ return dissect_ntlmssp_verf(auth_tvb, pinfo, tree);
+}
+
+static dcerpc_auth_subdissector_fns ntlmssp_sign_fns = {
+ wrap_dissect_ntlmssp, /* Bind */
+ wrap_dissect_ntlmssp, /* Bind ACK */
+ wrap_dissect_ntlmssp, /* AUTH3 */
+ wrap_dissect_ntlmssp_verf, /* Request verifier */
+ wrap_dissect_ntlmssp_verf, /* Response verifier */
+ NULL, /* Request data */
+ NULL /* Response data */
+};
+
+static dcerpc_auth_subdissector_fns ntlmssp_seal_fns = {
+ wrap_dissect_ntlmssp, /* Bind */
+ wrap_dissect_ntlmssp, /* Bind ACK */
+ wrap_dissect_ntlmssp, /* AUTH3 */
+ wrap_dissect_ntlmssp_verf, /* Request verifier */
+ wrap_dissect_ntlmssp_verf, /* Response verifier */
+ dissect_ntlmssp_encrypted_payload, /* Request data */
+ dissect_ntlmssp_encrypted_payload /* Response data */
+};
+
+void
+proto_reg_handoff_ntlmssp(void)
+{
+ dissector_handle_t ntlmssp_handle, ntlmssp_wrap_handle;
+
+ /* Register protocol with the GSS-API module */
+
+ ntlmssp_handle = find_dissector("ntlmssp");
+ ntlmssp_wrap_handle = find_dissector("ntlmssp_verf");
+ gssapi_init_oid("1.3.6.1.4.1.311.2.2.10", proto_ntlmssp, ett_ntlmssp,
+ ntlmssp_handle, ntlmssp_wrap_handle,
+ "NTLMSSP - Microsoft NTLM Security Support Provider");
+
+ /* Register authenticated pipe dissector */
+
+ /*
+ * XXX - the verifiers here seem to have a version of 1 and a body of all
+ * zeroes.
+ *
+ * XXX - DCE_C_AUTHN_LEVEL_CONNECT is, according to the DCE RPC 1.1
+ * spec, upgraded to DCE_C_AUTHN_LEVEL_PKT. Should we register
+ * any other levels here?
+ */
+ register_dcerpc_auth_subdissector(DCE_C_AUTHN_LEVEL_CONNECT,
+ DCE_C_RPC_AUTHN_PROTOCOL_NTLMSSP,
+ &ntlmssp_sign_fns);
+
+ register_dcerpc_auth_subdissector(DCE_C_AUTHN_LEVEL_PKT_INTEGRITY,
+ DCE_C_RPC_AUTHN_PROTOCOL_NTLMSSP,
+ &ntlmssp_sign_fns);
+
+ register_dcerpc_auth_subdissector(DCE_C_AUTHN_LEVEL_PKT_PRIVACY,
+ DCE_C_RPC_AUTHN_PROTOCOL_NTLMSSP,
+ &ntlmssp_seal_fns);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-20 01:20:29 +0000