source: trunk/server/libcli/samsync/decrypt.c

Last change on this file was 745, checked in by Silvan Scherrer, 13 years ago

Samba Server: updated trunk to 3.6.0
File size: 5.1 KB
RevLine 
[745]1/*
2 Unix SMB/CIFS implementation.
3
4 Extract the user/system database from a remote SamSync server
5
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
7 Copyright (C) Guenther Deschner <gd@samba.org> 2008
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
21*/
22
23
24#include "includes.h"
25#include "../lib/crypto/crypto.h"
26#include "../libcli/auth/libcli_auth.h"
27#include "../libcli/samsync/samsync.h"
28#include "librpc/gen_ndr/ndr_netlogon.h"
29
30/**
31 * Decrypt and extract the user's passwords.
32 *
33 * The writes decrypted (no longer 'RID encrypted' or arcfour encrypted)
34 * passwords back into the structure
35 */
36
37static NTSTATUS fix_user(TALLOC_CTX *mem_ctx,
38 struct netlogon_creds_CredentialState *creds,
39 enum netr_SamDatabaseID database_id,
40 struct netr_DELTA_ENUM *delta)
41{
42
43 uint32_t rid = delta->delta_id_union.rid;
44 struct netr_DELTA_USER *user = delta->delta_union.user;
45 struct samr_Password lm_hash;
46 struct samr_Password nt_hash;
47 unsigned char zero_buf[16];
48
49 memset(zero_buf, '\0', sizeof(zero_buf));
50
51 /* Note that win2000 may send us all zeros
52 * for the hashes if it doesn't
53 * think this channel is secure enough. */
54 if (user->lm_password_present) {
55 if (memcmp(user->lmpassword.hash, zero_buf, 16) != 0) {
56 sam_rid_crypt(rid, user->lmpassword.hash, lm_hash.hash, 0);
57 } else {
58 memset(lm_hash.hash, '\0', sizeof(lm_hash.hash));
59 }
60 user->lmpassword = lm_hash;
61 }
62
63 if (user->nt_password_present) {
64 if (memcmp(user->ntpassword.hash, zero_buf, 16) != 0) {
65 sam_rid_crypt(rid, user->ntpassword.hash, nt_hash.hash, 0);
66 } else {
67 memset(nt_hash.hash, '\0', sizeof(nt_hash.hash));
68 }
69 user->ntpassword = nt_hash;
70 }
71
72 if (user->user_private_info.SensitiveData) {
73 DATA_BLOB data;
74 struct netr_USER_KEYS keys;
75 enum ndr_err_code ndr_err;
76 data.data = user->user_private_info.SensitiveData;
77 data.length = user->user_private_info.DataLength;
78 netlogon_creds_arcfour_crypt(creds, data.data, data.length);
79 user->user_private_info.SensitiveData = data.data;
80 user->user_private_info.DataLength = data.length;
81
82 ndr_err = ndr_pull_struct_blob(&data, mem_ctx, &keys,
83 (ndr_pull_flags_fn_t)ndr_pull_netr_USER_KEYS);
84 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
85 dump_data(10, data.data, data.length);
86 return ndr_map_error2ntstatus(ndr_err);
87 }
88
89 /* Note that win2000 may send us all zeros
90 * for the hashes if it doesn't
91 * think this channel is secure enough. */
92 if (keys.keys.keys2.lmpassword.length == 16) {
93 if (memcmp(keys.keys.keys2.lmpassword.pwd.hash,
94 zero_buf, 16) != 0) {
95 sam_rid_crypt(rid,
96 keys.keys.keys2.lmpassword.pwd.hash,
97 lm_hash.hash, 0);
98 } else {
99 memset(lm_hash.hash, '\0', sizeof(lm_hash.hash));
100 }
101 user->lmpassword = lm_hash;
102 user->lm_password_present = true;
103 }
104 if (keys.keys.keys2.ntpassword.length == 16) {
105 if (memcmp(keys.keys.keys2.ntpassword.pwd.hash,
106 zero_buf, 16) != 0) {
107 sam_rid_crypt(rid,
108 keys.keys.keys2.ntpassword.pwd.hash,
109 nt_hash.hash, 0);
110 } else {
111 memset(nt_hash.hash, '\0', sizeof(nt_hash.hash));
112 }
113 user->ntpassword = nt_hash;
114 user->nt_password_present = true;
115 }
116 /* TODO: rid decrypt history fields */
117 }
118 return NT_STATUS_OK;
119}
120
121/**
122 * Decrypt and extract the secrets
123 *
124 * The writes decrypted secrets back into the structure
125 */
126static NTSTATUS fix_secret(TALLOC_CTX *mem_ctx,
127 struct netlogon_creds_CredentialState *creds,
128 enum netr_SamDatabaseID database,
129 struct netr_DELTA_ENUM *delta)
130{
131 struct netr_DELTA_SECRET *secret = delta->delta_union.secret;
132 netlogon_creds_arcfour_crypt(creds, secret->current_cipher.cipher_data,
133 secret->current_cipher.maxlen);
134
135 netlogon_creds_arcfour_crypt(creds, secret->old_cipher.cipher_data,
136 secret->old_cipher.maxlen);
137
138 return NT_STATUS_OK;
139}
140
141/**
142 * Fix up the delta, dealing with encryption issues so that the final
143 * callback need only do the printing or application logic
144 */
145
146NTSTATUS samsync_fix_delta(TALLOC_CTX *mem_ctx,
147 struct netlogon_creds_CredentialState *creds,
148 enum netr_SamDatabaseID database_id,
149 struct netr_DELTA_ENUM *delta)
150{
151 NTSTATUS status = NT_STATUS_OK;
152
153 switch (delta->delta_type) {
154 case NETR_DELTA_USER:
155
156 status = fix_user(mem_ctx,
157 creds,
158 database_id,
159 delta);
160 break;
161 case NETR_DELTA_SECRET:
162
163 status = fix_secret(mem_ctx,
164 creds,
165 database_id,
166 delta);
167 break;
168 default:
169 break;
170 }
171
172 return status;
173}
174
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