summaryrefslogtreecommitdiff
path: root/source4/smb_server/password.c
blob: 91a9eac3c7f52f947787b7dba9f704dc921c96e8 (plain)
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
/* 
   Unix SMB/CIFS implementation.
   Password and authentication handling
   Copyright (C) Andrew Tridgell 1992-1998
   
   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 "dlinklist.h"
#include "smb_server/smb_server.h"


/****************************************************************************
check if a uid has been validated, and return an pointer to the user_struct
if it has. NULL if not. vuid is biased by an offset. This allows us to
tell random client vuid's (normally zero) from valid vuids.
****************************************************************************/
struct smbsrv_session *smbsrv_session_find(struct smbsrv_connection *smb_conn, uint16_t vuid)
{
	struct smbsrv_session *sess;
	int count=0;

	if (vuid == UID_FIELD_INVALID)
		return NULL;

	for (sess=smb_conn->sessions.session_list; sess; sess=sess->next,count++) {
		if (vuid == sess->vuid) {
			if (count > 10) {
				DLIST_PROMOTE(smb_conn->sessions.session_list, sess);
			}
			return sess;
		}
	}

	return NULL;
}

/****************************************************************************
invalidate a uid
****************************************************************************/
void smbsrv_invalidate_vuid(struct smbsrv_connection *smb_conn, uint16_t vuid)
{
	struct smbsrv_session *sess = smbsrv_session_find(smb_conn, vuid);

	if (sess == NULL)
		return;

	DLIST_REMOVE(smb_conn->sessions.session_list, sess);

	/* clear the vuid from the 'cache' on each connection, and
	   from the vuid 'owner' of connections */
	/* REWRITE: conn_clear_vuid_cache(smb, vuid); */

	smb_conn->sessions.num_validated_vuids--;
}

/****************************************************************************
invalidate all vuid entries for this process
****************************************************************************/
void smbsrv_invalidate_all_vuids(struct smbsrv_connection *smb_conn)
{
	struct smbsrv_session *sess,*next=NULL;

	for (sess=smb_conn->sessions.session_list; sess; sess=next) {
		next = sess->next;
		
		smbsrv_invalidate_vuid(smb_conn, sess->vuid);
	}
}

/**
 *  register that a valid login has been performed, establish 'session'.
 *  @param session_info The token returned from the authentication process (if the authentication has completed)
 *   (now 'owned' by register_vuid)
 *
 *  @param smb_name The untranslated name of the user
 *
 *  @return Newly allocated vuid, biased by an offset. (This allows us to
 *   tell random client vuid's (normally zero) from valid vuids.)
 *
 */

uint16_t smbsrv_register_session(struct smbsrv_connection *smb_conn,
				 struct auth_session_info *session_info,
				 struct gensec_security *gensec_ctx)
{
	struct smbsrv_session *sess = NULL;

	sess = talloc_p(smb_conn, struct smbsrv_session);
	if(sess == NULL) {
		DEBUG(0,("talloc_p(smb_conn->mem_ctx, struct smbsrv_session) failed\n"));
		return UID_FIELD_INVALID;
	}

	ZERO_STRUCTP(sess);
	sess->vuid = UID_FIELD_INVALID;

	/* Ensure no vuid gets registered in share level security. */
	/* TODO: replace lp_security with a flag in smbsrv_connection */
	if(lp_security() == SEC_SHARE)
		return sess->vuid;

	/* Limit allowed vuids to 16bits - VUID_OFFSET. */
	if (smb_conn->sessions.num_validated_vuids >= 0xFFFF-VUID_OFFSET)
		return sess->vuid;

	/* Allocate a free vuid. Yes this is a linear search... :-) */
	while (smbsrv_session_find(smb_conn, smb_conn->sessions.next_vuid) != NULL ) {
		smb_conn->sessions.next_vuid++;
		/* Check for vuid wrap. */
		if (smb_conn->sessions.next_vuid == UID_FIELD_INVALID)
			smb_conn->sessions.next_vuid = VUID_OFFSET;
	}

	DEBUG(10,("register_vuid: allocated vuid = %u\n", 
		  (uint_t)smb_conn->sessions.next_vuid));

	sess->vuid = smb_conn->sessions.next_vuid;
	smb_conn->sessions.next_vuid++;
	smb_conn->sessions.num_validated_vuids++;

	/* use this to keep tabs on all our info from the authentication */
	if (session_info) {
		sess->session_info = talloc_reference(sess, session_info);
	}

	if (gensec_ctx) {
		sess->gensec_ctx = talloc_reference(sess, gensec_ctx);
	}

	sess->smb_conn = smb_conn;
	DLIST_ADD(smb_conn->sessions.session_list, sess);

	return sess->vuid;
}