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
|
/* Copyright (C) 2010 Sergei Golubchik and Monty Program Ab
Copyright (c) 2010, 2011, Oracle and/or its affiliates.
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; version 2 of the
License.
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
/**
@file
auth_socket authentication plugin.
Authentication is successful if the connection is done via a unix socket and
the owner of the client process matches the user name that was used when
connecting to mysqld.
*/
#define _GNU_SOURCE 1 /* for struct ucred */
#include <mysql/plugin_auth.h>
#include <string.h>
#include <pwd.h>
#include <sys/socket.h>
#include <sys/types.h>
#ifdef HAVE_PEERCRED
#define level SOL_SOCKET
#elif defined HAVE_SOCKPEERCRED
#define level SOL_SOCKET
#define ucred sockpeercred
#elif defined HAVE_XUCRED
#include <sys/un.h>
#include <sys/ucred.h>
#define level 0
#define SO_PEERCRED LOCAL_PEERCRED
#define uid cr_uid
#define ucred xucred
#elif defined HAVE_UNPCBID
#include <sys/un.h>
#define level 0
#define SO_PEERCRED LOCAL_PEEREID
#define uid unp_euid
#define ucred unpcbid
#elif defined HAVE_GETPEERUCRED
#include <ucred.h>
#elif defined HAVE_PEERCRED_STRUCT
#define level SOL_SOCKET
#define SO_PEERCRED SO_PEERID
#define uid euid
#define ucred peercred_struct
#else
#error impossible
#endif
/**
perform the unix socket based authentication
This authentication callback performs a unix socket based authentication -
it gets the uid of the client process and considers the user authenticated
if it uses username of this uid. That is - if the user is already
authenticated to the OS (if she is logged in) - she can use MySQL as herself
*/
static int socket_auth(MYSQL_PLUGIN_VIO *vio, MYSQL_SERVER_AUTH_INFO *info)
{
unsigned char *pkt;
MYSQL_PLUGIN_VIO_INFO vio_info;
#ifdef HAVE_GETPEERUCRED
ucred_t *cred = NULL;
#else
struct ucred cred;
socklen_t cred_len= sizeof(cred);
#endif
struct passwd pwd_buf, *pwd;
char buf[1024];
uid_t u;
/* no user name yet ? read the client handshake packet with the user name */
if (info->user_name == 0)
{
if (vio->read_packet(vio, &pkt) < 0)
return CR_ERROR;
}
info->password_used= PASSWORD_USED_NO_MENTION;
vio->info(vio, &vio_info);
if (vio_info.protocol != MYSQL_VIO_SOCKET)
return CR_ERROR;
/* get the UID of the client process */
#ifdef HAVE_GETPEERUCRED
if (getpeerucred(vio_info.socket, &cred) != 0)
return CR_ERROR;
u = ucred_geteuid(cred);
ucred_free(cred);
#else
if (getsockopt(vio_info.socket, level, SO_PEERCRED, &cred, &cred_len))
return CR_ERROR;
if (cred_len != sizeof(cred))
return CR_ERROR;
u = cred.uid;
#endif
/* and find the username for this uid */
getpwuid_r(u, &pwd_buf, buf, sizeof(buf), &pwd);
if (pwd == NULL)
return CR_ERROR;
/* now it's simple as that */
return strcmp(pwd->pw_name, info->user_name) ? CR_ERROR : CR_OK;
}
static struct st_mysql_auth socket_auth_handler=
{
MYSQL_AUTHENTICATION_INTERFACE_VERSION,
0,
socket_auth,
NULL, NULL /* no PASSWORD() */
};
maria_declare_plugin(auth_socket)
{
MYSQL_AUTHENTICATION_PLUGIN,
&socket_auth_handler,
"unix_socket",
"Sergei Golubchik",
"Unix Socket based authentication",
PLUGIN_LICENSE_GPL,
NULL,
NULL,
0x0100,
NULL,
NULL,
"1.0",
MariaDB_PLUGIN_MATURITY_STABLE
}
maria_declare_plugin_end;
|
