1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
/*
Unix SMB/CIFS implementation.
dcerpc schannel operations
Copyright (C) Andrew Tridgell 2004
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
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 "includes.h"
#include "librpc/gen_ndr/ndr_schannel.h"
#include "auth/auth.h"
/*
get a schannel key using a netlogon challenge on a secondary pipe
*/
static NTSTATUS dcerpc_schannel_key(TALLOC_CTX *tmp_ctx,
struct dcerpc_pipe *p,
struct cli_credentials *credentials)
{
NTSTATUS status;
struct dcerpc_binding *b;
struct dcerpc_pipe *p2;
struct netr_ServerReqChallenge r;
struct netr_ServerAuthenticate2 a;
struct netr_Credential credentials1, credentials2, credentials3;
struct samr_Password mach_pwd;
uint32_t negotiate_flags;
struct creds_CredentialState *creds;
creds = talloc(tmp_ctx, struct creds_CredentialState);
if (!creds) {
return NT_STATUS_NO_MEMORY;
}
if (p->conn->flags & DCERPC_SCHANNEL_128) {
negotiate_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
} else {
negotiate_flags = NETLOGON_NEG_AUTH2_FLAGS;
}
/*
step 1 - establish a netlogon connection, with no authentication
*/
/* Find the original binding string */
status = dcerpc_parse_binding(tmp_ctx, p->conn->binding_string, &b);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("Failed to parse dcerpc binding '%s'\n", p->conn->binding_string));
return status;
}
/* Make binding string for netlogon, not the other pipe */
status = dcerpc_epm_map_binding(tmp_ctx, b, DCERPC_NETLOGON_UUID, DCERPC_NETLOGON_VERSION);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("Failed to map DCERPC/TCP NCACN_NP pipe for '%s' - %s\n",
DCERPC_NETLOGON_UUID, nt_errstr(status)));
return status;
}
status = dcerpc_secondary_connection(p, &p2, b);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
status = dcerpc_bind_auth_none(p2, DCERPC_NETLOGON_UUID,
DCERPC_NETLOGON_VERSION);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(p2);
return status;
}
/*
step 2 - request a netlogon challenge
*/
r.in.server_name = talloc_asprintf(tmp_ctx, "\\\\%s", dcerpc_server_name(p));
r.in.computer_name = cli_credentials_get_workstation(credentials);
r.in.credentials = &credentials1;
r.out.credentials = &credentials2;
generate_random_buffer(credentials1.data, sizeof(credentials1.data));
status = dcerpc_netr_ServerReqChallenge(p2, tmp_ctx, &r);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
/*
step 3 - authenticate on the netlogon pipe
*/
E_md4hash(cli_credentials_get_password(credentials), mach_pwd.hash);
creds_client_init(creds, &credentials1, &credentials2,
&mach_pwd, &credentials3,
negotiate_flags);
a.in.server_name = r.in.server_name;
a.in.account_name = cli_credentials_get_username(credentials);
a.in.secure_channel_type =
cli_credentials_get_secure_channel_type(credentials);
a.in.computer_name = cli_credentials_get_workstation(credentials);
a.in.negotiate_flags = &negotiate_flags;
a.out.negotiate_flags = &negotiate_flags;
a.in.credentials = &credentials3;
a.out.credentials = &credentials3;
status = dcerpc_netr_ServerAuthenticate2(p2, tmp_ctx, &a);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
if (!creds_client_check(creds, a.out.credentials)) {
return NT_STATUS_UNSUCCESSFUL;
}
cli_credentials_set_netlogon_creds(credentials, creds);
/*
the schannel session key is now in creds.session_key
we no longer need the netlogon pipe open
*/
talloc_free(p2);
return NT_STATUS_OK;
}
NTSTATUS dcerpc_bind_auth_schannel(TALLOC_CTX *tmp_ctx,
struct dcerpc_pipe *p,
const char *uuid, uint_t version,
struct cli_credentials *credentials)
{
NTSTATUS status;
/* Fills in NETLOGON credentials */
status = dcerpc_schannel_key(tmp_ctx,
p, credentials);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to setup credentials for account %s: %s\n",
cli_credentials_get_username(credentials),
nt_errstr(status)));
return status;
}
return dcerpc_bind_auth_password(p, uuid, version,
credentials, DCERPC_AUTH_TYPE_SCHANNEL,
NULL);
}
|
