forked from osmocom/wireshark
Parse a NTLMv2 response blob as documented in
http://ubiqx.org/cifs/SMB.html#8, para 2.8.5.3 Convert some magic numbers to constants in dissect_ntlmssp_address_list() svn path=/trunk/; revision=7646
This commit is contained in:
Tim Potter
parent
f4119ebe85
commit
c7cf9a4207
245
packet-ntlmssp.c
245
packet-ntlmssp.c
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@ -2,7 +2,7 @@
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* Routines for NTLM Secure Service Provider
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* Devin Heitmueller <dheitmueller@netilla.com>
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*
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* $Id: packet-ntlmssp.c,v 1.36 2003/03/11 22:51:52 guy Exp $
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* $Id: packet-ntlmssp.c,v 1.37 2003/05/07 04:07:45 tpot Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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@ -55,6 +55,23 @@ static const value_string ntlmssp_message_types[] = {
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{ 0, NULL }
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};
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/* Name types */
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#define NTLMSSP_NAME_END 0x0000
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#define NTLMSSP_NAME_NB_HOST 0x0001
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#define NTLMSSP_NAME_NB_DOMAIN 0x0002
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#define NTLMSSP_NAME_DNS_HOST 0x0003
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#define NTLMSSP_NAME_DNS_DOMAIN 0x0004
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static const value_string ntlmssp_name_types[] = {
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{ NTLMSSP_NAME_END, "End of list" },
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{ NTLMSSP_NAME_NB_HOST, "NetBIOS host name" },
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{ NTLMSSP_NAME_NB_DOMAIN, "NetBIOS domain name" },
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{ NTLMSSP_NAME_DNS_HOST, "DNS host name" },
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{ NTLMSSP_NAME_DNS_DOMAIN, "DNS domain name" },
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{ 0, NULL }
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};
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/*
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* NTLMSSP negotiation flags
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* Taken from Samba
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@ -168,6 +185,16 @@ static int hf_ntlmssp_verf_unknown1 = -1;
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static int hf_ntlmssp_verf_crc32 = -1;
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static int hf_ntlmssp_verf_sequence = -1;
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static int hf_ntlmssp_decrypted_payload = -1;
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static int hf_ntlmssp_ntlmv2_response = -1;
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static int hf_ntlmssp_ntlmv2_response_hmac = -1;
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static int hf_ntlmssp_ntlmv2_response_header = -1;
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static int hf_ntlmssp_ntlmv2_response_reserved = -1;
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static int hf_ntlmssp_ntlmv2_response_time = -1;
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static int hf_ntlmssp_ntlmv2_response_chal = -1;
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static int hf_ntlmssp_ntlmv2_response_unknown = -1;
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static int hf_ntlmssp_ntlmv2_response_name = -1;
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static int hf_ntlmssp_ntlmv2_response_name_type = -1;
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static int hf_ntlmssp_ntlmv2_response_name_len = -1;
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static gint ett_ntlmssp = -1;
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static gint ett_ntlmssp_negotiate_flags = -1;
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@ -175,6 +202,8 @@ static gint ett_ntlmssp_string = -1;
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static gint ett_ntlmssp_blob = -1;
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static gint ett_ntlmssp_address_list = -1;
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static gint ett_ntlmssp_decrypted_tree = -1;
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static gint ett_ntlmssp_ntlmv2_response = -1;
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static gint ett_ntlmssp_ntlmv2_response_name = -1;
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/* Configuration variables */
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static char *nt_password = NULL;
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@ -295,7 +324,7 @@ create_ntlmssp_v1_key(const char *nt_password, const guint8 *challenge,
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memset(pw21, 0xBD, sizeof(pw21));
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memcpy(pw21, lm_password_hash, sizeof(lm_password_hash));
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/* Only the first eight bytes of challenge_reponse is used */
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/* Only the first eight bytes of challenge_response is used */
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crypt_des_ecb(rc4key, lm_challenge_response, pw21, 1);
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crypt_des_ecb(rc4key + 8, lm_challenge_response, pw21 + 7, 1);
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crypt_des_ecb(rc4key + 16, lm_challenge_response, pw21 + 14, 1);
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@ -426,6 +455,163 @@ dissect_ntlmssp_blob (tvbuff_t *tvb, int offset,
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return offset;
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}
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/* Dissect a NTLM response. This could be either NTLMv1 in which case
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we just call the dissect_ntlmssp_blob() function, or NTLMv2 where
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the blob actually has some structure. This is documented at
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http://ubiqx.org/cifs/SMB.html#8, para 2.8.5.3 */
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static int
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dissect_ntlmssp_ntlm_response(tvbuff_t *tvb, int offset,
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proto_tree *ntlmssp_tree, int blob_hf,
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int *end, ntlmssp_blob *result)
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{
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guint16 blob_length = tvb_get_letohs(tvb, offset);
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guint16 blob_maxlen = tvb_get_letohs(tvb, offset+2);
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guint32 blob_offset = tvb_get_letohl(tvb, offset+4);
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proto_item *item = NULL;
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proto_tree *subtree = NULL, *ntlmv2_tree = NULL;
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if (blob_length == 24) {
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/* Not NTLMv2 */
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return dissect_ntlmssp_blob(
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tvb, offset, ntlmssp_tree, blob_hf, end, result);
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}
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if (ntlmssp_tree) {
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item = proto_tree_add_item(
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ntlmssp_tree, blob_hf, tvb, blob_offset, blob_length,
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TRUE);
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subtree = proto_item_add_subtree(item, ett_ntlmssp_blob);
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}
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/* Dissect NTLMv2 response */
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proto_tree_add_uint(subtree, hf_ntlmssp_blob_len,
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tvb, offset, 2, blob_length);
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offset += 2;
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proto_tree_add_uint(subtree, hf_ntlmssp_blob_maxlen,
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tvb, offset, 2, blob_maxlen);
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offset += 2;
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proto_tree_add_uint(subtree, hf_ntlmssp_blob_offset,
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tvb, offset, 4, blob_offset);
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offset += 4;
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*end = blob_offset + blob_length;
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/* Dissect NTLMv2 bits&pieces */
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if (subtree) {
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item = proto_tree_add_item(
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subtree, hf_ntlmssp_ntlmv2_response, tvb,
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blob_offset, blob_length - 8, TRUE);
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ntlmv2_tree = proto_item_add_subtree(
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item, ett_ntlmssp_ntlmv2_response);
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}
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proto_tree_add_item(
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ntlmv2_tree, hf_ntlmssp_ntlmv2_response_hmac, tvb,
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blob_offset, 16, TRUE);
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blob_offset += 16;
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proto_tree_add_item(
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ntlmv2_tree, hf_ntlmssp_ntlmv2_response_header, tvb,
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blob_offset, 4, TRUE);
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blob_offset += 4;
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proto_tree_add_item(
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ntlmv2_tree, hf_ntlmssp_ntlmv2_response_reserved, tvb,
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blob_offset, 4, TRUE);
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blob_offset += 4;
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blob_offset = dissect_smb_64bit_time(
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tvb, ntlmv2_tree, blob_offset,
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hf_ntlmssp_ntlmv2_response_time);
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proto_tree_add_item(
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ntlmv2_tree, hf_ntlmssp_ntlmv2_response_chal, tvb,
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blob_offset, 8, TRUE);
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blob_offset += 8;
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proto_tree_add_item(
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ntlmv2_tree, hf_ntlmssp_ntlmv2_response_unknown, tvb,
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blob_offset, 4, TRUE);
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blob_offset += 4;
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/* Variable length list of names */
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while(1) {
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guint16 name_type = tvb_get_letohs(tvb, blob_offset);
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guint16 name_len = tvb_get_letohs(tvb, blob_offset + 2);
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proto_tree *name_tree = NULL;
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char *name = NULL;
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if (ntlmv2_tree) {
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item = proto_tree_add_item(
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ntlmv2_tree, hf_ntlmssp_ntlmv2_response_name,
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tvb, blob_offset, 0, TRUE);
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name_tree = proto_item_add_subtree(
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item, ett_ntlmssp_ntlmv2_response_name);
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}
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/* Dissect name header */
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proto_tree_add_item(
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name_tree, hf_ntlmssp_ntlmv2_response_name_type, tvb,
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blob_offset, 2, TRUE);
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blob_offset += 2;
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proto_tree_add_item(
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name_tree, hf_ntlmssp_ntlmv2_response_name_len, tvb,
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blob_offset, 2, TRUE);
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blob_offset += 2;
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/* Dissect name */
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if (name_len > 0) {
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name = tvb_fake_unicode(
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tvb, blob_offset, name_len / 2, TRUE);
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proto_tree_add_text(
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name_tree, tvb, blob_offset, name_len,
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"Name: %s", name);
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} else
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name = g_strdup("NULL");
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if (name_type == 0)
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proto_item_append_text(
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item, "%s",
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val_to_str(name_type, ntlmssp_name_types,
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"Unknown"));
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else
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proto_item_append_text(
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item, "%s, %s",
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val_to_str(name_type, ntlmssp_name_types,
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"Unknown"), name);
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g_free(name);
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blob_offset += name_len;
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proto_item_set_len(item, name_len + 4);
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if (name_type == 0) /* End of list */
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break;
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};
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return offset;
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}
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static int
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dissect_ntlmssp_negotiate_flags (tvbuff_t *tvb, int offset,
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proto_tree *ntlmssp_tree,
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@ -626,19 +812,19 @@ dissect_ntlmssp_address_list (tvbuff_t *tvb, int offset,
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if (!text) text = ""; /* Make sure we don't blow up below */
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switch(item_type) {
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case 1:
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case NTLMSSP_NAME_NB_HOST:
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proto_tree_add_string(tree, hf_ntlmssp_address_list_server_nb,
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tvb, item_offset, item_length, text);
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break;
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case 2:
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case NTLMSSP_NAME_NB_DOMAIN:
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proto_tree_add_string(tree, hf_ntlmssp_address_list_domain_nb,
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tvb, item_offset, item_length, text);
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break;
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case 3:
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case NTLMSSP_NAME_DNS_HOST:
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proto_tree_add_string(tree, hf_ntlmssp_address_list_server_dns,
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tvb, item_offset, item_length, text);
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break;
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case 4:
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case NTLMSSP_NAME_DNS_DOMAIN:
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proto_tree_add_string(tree, hf_ntlmssp_address_list_domain_dns,
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tvb, item_offset, item_length, text);
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}
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@ -821,11 +1007,11 @@ dissect_ntlmssp_auth (tvbuff_t *tvb, packet_info *pinfo, int offset,
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/* NTLM response */
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item_start = tvb_get_letohl(tvb, offset+4);
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offset = dissect_ntlmssp_blob(tvb, offset, ntlmssp_tree,
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hf_ntlmssp_auth_ntresponse,
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&item_end,
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conv_ntlmssp_info == NULL ? NULL :
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&conv_ntlmssp_info->ntlm_response);
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offset = dissect_ntlmssp_ntlm_response(tvb, offset, ntlmssp_tree,
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hf_ntlmssp_auth_ntresponse,
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&item_end,
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conv_ntlmssp_info == NULL ? NULL :
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&conv_ntlmssp_info->ntlm_response);
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data_start = MIN(data_start, item_start);
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data_end = MAX(data_end, item_end);
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@ -1463,8 +1649,37 @@ proto_register_ntlmssp(void)
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{ &hf_ntlmssp_verf_crc32,
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{ "Verifier CRC32", "ntlmssp.verf.crc32", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL }},
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{ &hf_ntlmssp_verf_sequence,
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{ "Verifier Sequence Number", "ntlmssp.verf.sequence", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }}
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{ "Verifier Sequence Number", "ntlmssp.verf.sequence", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }},
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{ &hf_ntlmssp_ntlmv2_response,
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{ "NTLMv2 Response", "ntlmssp.auth.ntresponsev2", FT_BYTES, BASE_HEX,
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NULL, 0x0, "", HFILL }},
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{ &hf_ntlmssp_ntlmv2_response_hmac,
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{ "HMAC", "ntlmssp.auth.ntresponsev2.hmac", FT_BYTES, BASE_HEX,
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NULL, 0x0, "", HFILL }},
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{ &hf_ntlmssp_ntlmv2_response_header,
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{ "Header", "ntlmssp.auth.ntresponsev2.header", FT_UINT32, BASE_HEX,
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NULL, 0x0, "", HFILL }},
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{ &hf_ntlmssp_ntlmv2_response_reserved,
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{ "Reserved", "ntlmssp.auth.ntresponsev2.reserved", FT_UINT32, BASE_HEX,
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NULL, 0x0, "", HFILL }},
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{ &hf_ntlmssp_ntlmv2_response_time,
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{ "Time", "ntlmssp.auth.ntresponsev2.time", FT_ABSOLUTE_TIME, BASE_NONE,
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NULL, 0, "", HFILL }},
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{ &hf_ntlmssp_ntlmv2_response_chal,
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{ "Client challenge", "ntlmssp.auth.ntresponsev2.chal", FT_BYTES,
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BASE_HEX, NULL, 0x0, "", HFILL }},
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{ &hf_ntlmssp_ntlmv2_response_unknown,
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{ "Unknown", "ntlmssp.auth.ntresponsev2.unknown", FT_UINT32, BASE_HEX,
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NULL, 0x0, "", HFILL }},
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{ &hf_ntlmssp_ntlmv2_response_name,
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{ "Name", "ntlmssp.auth.ntresponsev2.name", FT_STRING, BASE_NONE,
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NULL, 0x0, "", HFILL }},
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{ &hf_ntlmssp_ntlmv2_response_name_type,
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{ "Name type", "ntlmssp.auth.ntresponsev2.name.type", FT_UINT32,
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BASE_DEC, VALS(ntlmssp_name_types), 0x0, "", HFILL }},
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{ &hf_ntlmssp_ntlmv2_response_name_len,
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{ "Name len", "ntlmssp.auth.ntresponsev2.name.len", FT_UINT32,
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BASE_DEC, NULL, 0x0, "", HFILL }},
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};
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@ -1474,7 +1689,9 @@ proto_register_ntlmssp(void)
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&ett_ntlmssp_string,
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&ett_ntlmssp_blob,
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&ett_ntlmssp_address_list,
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&ett_ntlmssp_decrypted_tree
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&ett_ntlmssp_decrypted_tree,
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&ett_ntlmssp_ntlmv2_response,
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&ett_ntlmssp_ntlmv2_response_name
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};
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module_t *ntlmssp_module;
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