summaryrefslogtreecommitdiffstats
path: root/doc/src/sgml/man7/SECURITY_LABEL.7
blob: c92fea07f61952928d739759d730310fd6b9345a (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
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
'\" t
.\"     Title: SECURITY LABEL
.\"    Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 2023
.\"    Manual: PostgreSQL 15.5 Documentation
.\"    Source: PostgreSQL 15.5
.\"  Language: English
.\"
.TH "SECURITY LABEL" "7" "2023" "PostgreSQL 15.5" "PostgreSQL 15.5 Documentation"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
SECURITY_LABEL \- define or change a security label applied to an object
.SH "SYNOPSIS"
.sp
.nf
SECURITY LABEL [ FOR \fIprovider\fR ] ON
{
  TABLE \fIobject_name\fR |
  COLUMN \fItable_name\fR\&.\fIcolumn_name\fR |
  AGGREGATE \fIaggregate_name\fR ( \fIaggregate_signature\fR ) |
  DATABASE \fIobject_name\fR |
  DOMAIN \fIobject_name\fR |
  EVENT TRIGGER \fIobject_name\fR |
  FOREIGN TABLE \fIobject_name\fR
  FUNCTION \fIfunction_name\fR [ ( [ [ \fIargmode\fR ] [ \fIargname\fR ] \fIargtype\fR [, \&.\&.\&.] ] ) ] |
  LARGE OBJECT \fIlarge_object_oid\fR |
  MATERIALIZED VIEW \fIobject_name\fR |
  [ PROCEDURAL ] LANGUAGE \fIobject_name\fR |
  PROCEDURE \fIprocedure_name\fR [ ( [ [ \fIargmode\fR ] [ \fIargname\fR ] \fIargtype\fR [, \&.\&.\&.] ] ) ] |
  PUBLICATION \fIobject_name\fR |
  ROLE \fIobject_name\fR |
  ROUTINE \fIroutine_name\fR [ ( [ [ \fIargmode\fR ] [ \fIargname\fR ] \fIargtype\fR [, \&.\&.\&.] ] ) ] |
  SCHEMA \fIobject_name\fR |
  SEQUENCE \fIobject_name\fR |
  SUBSCRIPTION \fIobject_name\fR |
  TABLESPACE \fIobject_name\fR |
  TYPE \fIobject_name\fR |
  VIEW \fIobject_name\fR
} IS { \fIstring_literal\fR | NULL }

where \fIaggregate_signature\fR is:

* |
[ \fIargmode\fR ] [ \fIargname\fR ] \fIargtype\fR [ , \&.\&.\&. ] |
[ [ \fIargmode\fR ] [ \fIargname\fR ] \fIargtype\fR [ , \&.\&.\&. ] ] ORDER BY [ \fIargmode\fR ] [ \fIargname\fR ] \fIargtype\fR [ , \&.\&.\&. ]
.fi
.SH "DESCRIPTION"
.PP
\fBSECURITY LABEL\fR
applies a security label to a database object\&. An arbitrary number of security labels, one per label provider, can be associated with a given database object\&. Label providers are loadable modules which register themselves by using the function
\fBregister_label_provider\fR\&.
.if n \{\
.sp
.\}
.RS 4
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBNote\fR
.ps -1
.br
.PP
\fBregister_label_provider\fR
is not an SQL function; it can only be called from C code loaded into the backend\&.
.sp .5v
.RE
.PP
The label provider determines whether a given label is valid and whether it is permissible to assign that label to a given object\&. The meaning of a given label is likewise at the discretion of the label provider\&.
PostgreSQL
places no restrictions on whether or how a label provider must interpret security labels; it merely provides a mechanism for storing them\&. In practice, this facility is intended to allow integration with label\-based mandatory access control (MAC) systems such as
SELinux\&. Such systems make all access control decisions based on object labels, rather than traditional discretionary access control (DAC) concepts such as users and groups\&.
.SH "PARAMETERS"
.PP
\fIobject_name\fR
.br
\fItable_name\&.column_name\fR
.br
\fIaggregate_name\fR
.br
\fIfunction_name\fR
.br
\fIprocedure_name\fR
.br
\fIroutine_name\fR
.RS 4
The name of the object to be labeled\&. Names of objects that reside in schemas (tables, functions, etc\&.) can be schema\-qualified\&.
.RE
.PP
\fIprovider\fR
.RS 4
The name of the provider with which this label is to be associated\&. The named provider must be loaded and must consent to the proposed labeling operation\&. If exactly one provider is loaded, the provider name may be omitted for brevity\&.
.RE
.PP
\fIargmode\fR
.RS 4
The mode of a function, procedure, or aggregate argument:
IN,
OUT,
INOUT, or
VARIADIC\&. If omitted, the default is
IN\&. Note that
\fBSECURITY LABEL\fR
does not actually pay any attention to
OUT
arguments, since only the input arguments are needed to determine the function\*(Aqs identity\&. So it is sufficient to list the
IN,
INOUT, and
VARIADIC
arguments\&.
.RE
.PP
\fIargname\fR
.RS 4
The name of a function, procedure, or aggregate argument\&. Note that
\fBSECURITY LABEL\fR
does not actually pay any attention to argument names, since only the argument data types are needed to determine the function\*(Aqs identity\&.
.RE
.PP
\fIargtype\fR
.RS 4
The data type of a function, procedure, or aggregate argument\&.
.RE
.PP
\fIlarge_object_oid\fR
.RS 4
The OID of the large object\&.
.RE
.PP
PROCEDURAL
.RS 4
This is a noise word\&.
.RE
.PP
\fIstring_literal\fR
.RS 4
The new setting of the security label, written as a string literal\&.
.RE
.PP
NULL
.RS 4
Write
NULL
to drop the security label\&.
.RE
.SH "EXAMPLES"
.PP
The following example shows how the security label of a table could be set or changed:
.sp
.if n \{\
.RS 4
.\}
.nf
SECURITY LABEL FOR selinux ON TABLE mytable IS \*(Aqsystem_u:object_r:sepgsql_table_t:s0\*(Aq;
.fi
.if n \{\
.RE
.\}
.sp
To remove the label:
.sp
.if n \{\
.RS 4
.\}
.nf
SECURITY LABEL FOR selinux ON TABLE mytable IS NULL;
.fi
.if n \{\
.RE
.\}
.sp
.SH "COMPATIBILITY"
.PP
There is no
\fBSECURITY LABEL\fR
command in the SQL standard\&.
.SH "SEE ALSO"
sepgsql, src/test/modules/dummy_seclabel