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9eb9c93275
In attempting to enable building various part of Android with -Wall -Werror, we found that the const security_context_t declarations in libselinux are incorrect; const char * was intended, but const security_context_t translates to char * const and triggers warnings on passing const char * from the caller. Easiest fix is to replace them all with const char *. And while we are at it, just get rid of all usage of security_context_t itself as it adds no value - there is no true encapsulation of the security context strings and callers already directly use string functions on them. typedef left to permit building legacy users until such a time as all are updated. This is a port of Change-Id I2f9df7bb9f575f76024c3e5f5b660345da2931a7 from Android, augmented to deal with all of the other code in upstream libselinux and updating the man pages too. Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov> Acked-by: Eric Paris <eparis@redhat.com>
94 lines
3.4 KiB
Groff
94 lines
3.4 KiB
Groff
.\" Hey Emacs! This file is -*- nroff -*- source.
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.\"
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.\" Author: Eamon Walsh (ewalsh@tycho.nsa.gov) 2007
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.TH "selabel_media" "5" "29 Nov 2011" "Security Enhanced Linux" "SELinux API documentation"
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.SH "NAME"
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selabel_media \- userspace SELinux labeling interface and configuration file format for the media contexts backend
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.
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.SH "SYNOPSIS"
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.B #include <selinux/label.h>
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.sp
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.BI "int selabel_lookup(struct selabel_handle *" hnd ,
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.in +\w'int selabel_lookup('u
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.BI "char **" context ,
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.br
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.BI "const char *" device_name ", int " unused ");"
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.in
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.sp
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.BI "int selabel_lookup_raw(struct selabel_handle *" hnd ,
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.in +\w'int selabel_lookup('u
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.BI "char **" context ,
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.br
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.BI "const char *" device_name ", int " unused ");"
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.
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.SH "DESCRIPTION"
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The media contexts backend maps from media device names such as "cdrom" or "floppy" into security contexts. It is used to find the appropriate context for establishing context mounts on these devices. The returned \fIcontext\fR must be freed using \fBfreecon\fR(3).
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.br
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\fBselabel_lookup\fR(3) describes the function with its return and error codes.
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.sp
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The integer lookup argument is currently unused and should be set to zero.
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.sp
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Any messages generated by \fBselabel_lookup\fR(3) are sent to \fIstderr\fR
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by default, although this can be changed by \fBselinux_set_callback\fR(3).
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.sp
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.BR selabel_lookup_raw (3)
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behaves identically to \fBselabel_lookup\fR(3) but does not perform context
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translation.
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.sp
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The \fBFILES\fR section details the configuration files used to determine the media context.
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.
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.SH "OPTIONS"
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In addition to the global options described in \fBselabel_open\fR(3), this backend recognizes the following options:
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.TP
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.B SELABEL_OPT_PATH
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A non-null value for this option specifies a path to a file that will be opened in lieu of the standard \fImedia\fR contexts file.
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.
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.SH "FILES"
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The media context file used to retrieve a default context depends on the \fBSELABEL_OPT_PATH\fR parameter passed to \fBselabel_open\FR(3). If \fINULL\fR, then the \fBSELABEL_OPT_PATH\fR value will default to the active policy media contexts location (as returned by \fBselinux_media_context_path\fR(3)), otherwise the actual \fBSELABEL_OPT_PATH\fR value specified is used.
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.sp
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The default media contexts file is:
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.RS
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.I /etc/selinux/{SELINUXTYPE}/contexts/files/media
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.RE
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.sp
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Where \fI{SELINUXTYPE}\fR is the entry from the selinux configuration file \fIconfig\fR (see \fBselinux_config\fR(5)).
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.sp
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Should there not be a valid entry in the \fImedia\fR file, then the default \fIremovable_context\fR file will be read (see \fBremovable_context\fR(5)).
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.
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.SH "FILE FORMAT"
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Each line within the \fImedia\fR file is as follows:
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.RS
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.I device_name context
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.RE
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.sp
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Where:
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.RS
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.I device_name
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.RS
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The media identifier (e.g. cdrom, floppy, disk and usb).
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.RE
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.I context
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.RS
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The context to be used for labeling the device.
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.RE
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.RE
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.sp
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Example:
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.RS
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# contexts/files/media
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.br
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cdrom system_u:object_r:removable_device_t
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.br
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floppy system_u:object_r:removable_device_t
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.br
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disk system_u:object_r:fixed_disk_device_t
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.
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.SH "NOTES"
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If contexts are to be validated, then the global option \fBSELABEL_OPT_VALIDATE\fR must be set before calling \fBselabel_open\fR(3). If
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this is not set, then it is possible for an invalid context to be returned.
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.
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.SH "SEE ALSO"
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.ad l
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.nh
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.BR selinux "(8), " selabel_open "(3), " selabel_lookup "(3), " selabel_stats "(3), " selabel_close "(3), " selinux_set_callback "(3), " selinux_media_context_path "(3), " freecon "(3), " selinux_config "(5), " removable_context "(5) "
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