154 lines
4.7 KiB
Diff
154 lines
4.7 KiB
Diff
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This patch adds to the mount man page docs about context, fscontext and
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defcontext mount options and translate context options from human to raw
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selinux context format. -- 03/30/2006 Karel Zak <kzak@redhat.com>
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--- util-linux-2.13-pre7/mount/mount.8.cxt 2006-03-30 17:15:06.000000000 +0200
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+++ util-linux-2.13-pre7/mount/mount.8 2006-03-30 17:15:06.000000000 +0200
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@@ -661,6 +661,50 @@
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.BR noexec ", " nosuid ", and " nodev
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(unless overridden by subsequent options, as in the option line
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.BR users,exec,dev,suid ).
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+.TP
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+\fBcontext=\fP\fIcontext\fP, \fBfscontext=\fP\fIcontext\fP and \fBdefcontext=\fP\fIcontext\fP
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+The
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+.BR context=
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+option is useful when mounting filesystems that do not support
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+extended attributes, such as a floppy or hard disk formatted with VFAT, or
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+systems that are not normally running under SELinux, such as an ext3 formatted
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+disk from a non-SELinux workstation. You can also use
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+.BR context=
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+on filesystems you do not trust, such as a floppy. It also helps in compatibility with
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+xattr-supporting filesystems on earlier 2.4.<x> kernel versions. Even where
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+xattrs are supported, you can save time not having to label every file by
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+assigning the entire disk one security context.
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+
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+A commonly used option for removable media is
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+.BR context=system_u:object_r:removable_t .
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+
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+Two other options are
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+.BR fscontext=
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+and
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+.BR defcontext= ,
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+both of which are mutually exclusive of the context option. This means you
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+can use fscontext and defcontext with each other, but neither can be used with
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+context.
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+
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+The
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+.BR fscontext=
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+option works for all filesystems, regardless of their xattr
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+support. The fscontext option sets the overarching filesystem label to a
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+specific security context. This filesystem label is separate from the
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+individual labels on the files. It represents the entire filesystem for
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+certain kinds of permission checks, such as during mount or file creation.
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+Individual file labels are still obtained from the xattrs on the files
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+themselves. The context option actually sets the aggregate context that
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+fscontext provides, in addition to supplying the same label for individual
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+files.
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+
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+You can set the default security context for unlabeled files using
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+.BR defcontext=
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+option. This overrides the value set for unlabeled files in the policy and requires a
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+file system that supports xattr labeling.
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+
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+For more details see
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+.BR selinux (8)
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.RE
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.TP
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.B \-\-bind
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--- util-linux-2.13-pre7/mount/mount.c.cxt 2006-03-30 17:15:06.000000000 +0200
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+++ util-linux-2.13-pre7/mount/mount.c 2006-03-30 20:16:57.000000000 +0200
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@@ -21,6 +21,11 @@
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#include <sys/wait.h>
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#include <sys/mount.h>
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+#ifdef HAVE_LIBSELINUX
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+#include <selinux/selinux.h>
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+#include <selinux/context.h>
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+#endif
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+
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#include "mount_blkid.h"
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#include "mount_constants.h"
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#include "sundries.h"
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@@ -255,6 +260,49 @@
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free((void *) s);
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}
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+#ifdef HAVE_LIBSELINUX
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+/* translates SELinux context from human to raw format and
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+ * appends it to the mount extra options.
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+ *
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+ * returns -1 on error and 0 on success
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+ */
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+static int
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+append_context(const char *optname, const char *optdata, char *extra_opts, int *len)
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+{
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+ security_context_t raw = NULL;
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+ char *buf = NULL;
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+ int bufsz;
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+
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+ if (!is_selinux_enabled())
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+ /* ignore the option if we running without selinux */
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+ return 0;
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+
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+ if (optdata==NULL || *optdata=='\0' || optname==NULL)
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+ return -1;
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+
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+ if (selinux_trans_to_raw_context(
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+ (security_context_t) optdata, &raw)==-1 ||
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+ raw==NULL)
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+ return -1;
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+
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+ if (verbose)
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+ printf(_("mount: translated %s '%s' to '%s'\n"),
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+ optname, optdata, (char *) raw);
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+
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+ bufsz = strlen(optname) + strlen(raw) + 2; /* 2 is \0 and '=' */
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+ buf = xmalloc(bufsz);
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+
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+ snprintf(buf, bufsz, "%s=%s", optname, (char *) raw);
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+ freecon(raw);
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+
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+ if ((*len -= bufsz-1) > 0)
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+ strcat(extra_opts, buf);
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+
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+ my_free(buf);
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+ return 0;
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+}
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+#endif
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+
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/*
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* Look for OPT in opt_map table and return mask value.
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* If OPT isn't found, tack it onto extra_opts (which is non-NULL).
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@@ -313,7 +361,20 @@
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return;
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}
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}
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-
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+#ifdef HAVE_LIBSELINUX
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+ if (strncmp(opt, "context=", 8)==0 && *(opt+8)) {
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+ if (append_context("context", opt+8, extra_opts, &len)==0)
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+ return;
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+ }
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+ if (strncmp(opt, "fscontext=", 10)==0 && *(opt+10)) {
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+ if (append_context("fscontext", opt+10, extra_opts, &len)==0)
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+ return;
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+ }
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+ if (strncmp(opt, "defcontext=", 11)==0 && *(opt+11)) {
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+ if (append_context("defcontext", opt+11, extra_opts, &len)==0)
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+ return;
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+ }
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+#endif
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if ((len -= strlen(opt)) > 0)
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strcat(extra_opts, opt);
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}
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@@ -330,7 +391,7 @@
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if (options != NULL) {
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char *opts = xstrdup(options);
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char *opt;
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- int len = strlen(opts) + 20;
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+ int len = strlen(opts) + 256;
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*extra_opts = xmalloc(len);
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**extra_opts = '\0';
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