diff options
| -rw-r--r-- | Documentation/SELinux.txt | 27 | ||||
| -rw-r--r-- | scripts/Makefile | 3 | ||||
| -rw-r--r-- | scripts/selinux/Makefile | 2 | ||||
| -rw-r--r-- | scripts/selinux/README | 2 | ||||
| -rw-r--r-- | scripts/selinux/install_policy.sh | 69 | ||||
| -rw-r--r-- | scripts/selinux/mdp/Makefile | 5 | ||||
| -rw-r--r-- | scripts/selinux/mdp/dbus_contexts | 6 | ||||
| -rw-r--r-- | scripts/selinux/mdp/mdp.c | 242 |
8 files changed, 355 insertions, 1 deletions
diff --git a/Documentation/SELinux.txt b/Documentation/SELinux.txt new file mode 100644 index 00000000000..07eae00f331 --- /dev/null +++ b/Documentation/SELinux.txt @@ -0,0 +1,27 @@ +If you want to use SELinux, chances are you will want +to use the distro-provided policies, or install the +latest reference policy release from + http://oss.tresys.com/projects/refpolicy + +However, if you want to install a dummy policy for +testing, you can do using 'mdp' provided under +scripts/selinux. Note that this requires the selinux +userspace to be installed - in particular you will +need checkpolicy to compile a kernel, and setfiles and +fixfiles to label the filesystem. + + 1. Compile the kernel with selinux enabled. + 2. Type 'make' to compile mdp. + 3. Make sure that you are not running with + SELinux enabled and a real policy. If + you are, reboot with selinux disabled + before continuing. + 4. Run install_policy.sh: + cd scripts/selinux + sh install_policy.sh + +Step 4 will create a new dummy policy valid for your +kernel, with a single selinux user, role, and type. +It will compile the policy, will set your SELINUXTYPE to +dummy in /etc/selinux/config, install the compiled policy +as 'dummy', and relabel your filesystem. diff --git a/scripts/Makefile b/scripts/Makefile index 1c73c5aea66..aafdf064fee 100644 --- a/scripts/Makefile +++ b/scripts/Makefile @@ -20,6 +20,7 @@ hostprogs-y += unifdef subdir-$(CONFIG_MODVERSIONS) += genksyms subdir-y += mod +subdir-$(CONFIG_SECURITY_SELINUX) += selinux # Let clean descend into subdirs -subdir- += basic kconfig package +subdir- += basic kconfig package selinux diff --git a/scripts/selinux/Makefile b/scripts/selinux/Makefile new file mode 100644 index 00000000000..ca4b1ec0182 --- /dev/null +++ b/scripts/selinux/Makefile @@ -0,0 +1,2 @@ +subdir-y := mdp +subdir- += mdp diff --git a/scripts/selinux/README b/scripts/selinux/README new file mode 100644 index 00000000000..a936315ba2c --- /dev/null +++ b/scripts/selinux/README @@ -0,0 +1,2 @@ +Please see Documentation/SELinux.txt for information on +installing a dummy SELinux policy. diff --git a/scripts/selinux/install_policy.sh b/scripts/selinux/install_policy.sh new file mode 100644 index 00000000000..7b9ccf61f8f --- /dev/null +++ b/scripts/selinux/install_policy.sh @@ -0,0 +1,69 @@ +#!/bin/sh +if [ `id -u` -ne 0 ]; then + echo "$0: must be root to install the selinux policy" + exit 1 +fi +SF=`which setfiles` +if [ $? -eq 1 ]; then + if [ -f /sbin/setfiles ]; then + SF="/usr/setfiles" + else + echo "no selinux tools installed: setfiles" + exit 1 + fi +fi + +cd mdp + +CP=`which checkpolicy` +VERS=`$CP -V | awk '{print $1}'` + +./mdp policy.conf file_contexts +$CP -o policy.$VERS policy.conf + +mkdir -p /etc/selinux/dummy/policy +mkdir -p /etc/selinux/dummy/contexts/files + +cp file_contexts /etc/selinux/dummy/contexts/files +cp dbus_contexts /etc/selinux/dummy/contexts +cp policy.$VERS /etc/selinux/dummy/policy +FC_FILE=/etc/selinux/dummy/contexts/files/file_contexts + +if [ ! -d /etc/selinux ]; then + mkdir -p /etc/selinux +fi +if [ ! -f /etc/selinux/config ]; then + cat > /etc/selinux/config << EOF +SELINUX=enforcing +SELINUXTYPE=dummy +EOF +else + TYPE=`cat /etc/selinux/config | grep "^SELINUXTYPE" | tail -1 | awk -F= '{ print $2 '}` + if [ "eq$TYPE" != "eqdummy" ]; then + selinuxenabled + if [ $? -eq 0 ]; then + echo "SELinux already enabled with a non-dummy policy." + echo "Exiting. Please install policy by hand if that" + echo "is what you REALLY want." + exit 1 + fi + mv /etc/selinux/config /etc/selinux/config.mdpbak + grep -v "^SELINUXTYPE" /etc/selinux/config.mdpbak >> /etc/selinux/config + echo "SELINUXTYPE=dummy" >> /etc/selinux/config + fi +fi + +cd /etc/selinux/dummy/contexts/files +$SF file_contexts / + +mounts=`cat /proc/$$/mounts | egrep "ext2|ext3|xfs|jfs|ext4|ext4dev|gfs2" | awk '{ print $2 '}` +$SF file_contexts $mounts + + +dodev=`cat /proc/$$/mounts | grep "/dev "` +if [ "eq$dodev" != "eq" ]; then + mount --move /dev /mnt + $SF file_contexts /dev + mount --move /mnt /dev +fi + diff --git a/scripts/selinux/mdp/Makefile b/scripts/selinux/mdp/Makefile new file mode 100644 index 00000000000..eb365b33344 --- /dev/null +++ b/scripts/selinux/mdp/Makefile @@ -0,0 +1,5 @@ +hostprogs-y := mdp +HOST_EXTRACFLAGS += -Isecurity/selinux/include + +always := $(hostprogs-y) +clean-files := $(hostprogs-y) policy.* file_contexts diff --git a/scripts/selinux/mdp/dbus_contexts b/scripts/selinux/mdp/dbus_contexts new file mode 100644 index 00000000000..116e684f9fc --- /dev/null +++ b/scripts/selinux/mdp/dbus_contexts @@ -0,0 +1,6 @@ +<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN" + "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd"> +<busconfig> + <selinux> + </selinux> +</busconfig> diff --git a/scripts/selinux/mdp/mdp.c b/scripts/selinux/mdp/mdp.c new file mode 100644 index 00000000000..ca757d48618 --- /dev/null +++ b/scripts/selinux/mdp/mdp.c @@ -0,0 +1,242 @@ +/* + * + * mdp - make dummy policy + * + * When pointed at a kernel tree, builds a dummy policy for that kernel + * with exactly one type with full rights to itself. + * + * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * Copyright (C) IBM Corporation, 2006 + * + * Authors: Serge E. Hallyn <serue@us.ibm.com> + */ + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> + +#include "flask.h" + +void usage(char *name) +{ + printf("usage: %s [-m] policy_file context_file\n", name); + exit(1); +} + +void find_common_name(char *cname, char *dest, int len) +{ + char *start, *end; + + start = strchr(cname, '_')+1; + end = strchr(start, '_'); + if (!start || !end || start-cname > len || end-start > len) { + printf("Error with commons defines\n"); + exit(1); + } + strncpy(dest, start, end-start); + dest[end-start] = '\0'; +} + +#define S_(x) x, +static char *classlist[] = { +#include "class_to_string.h" + NULL +}; +#undef S_ + +#include "initial_sid_to_string.h" + +#define TB_(x) char *x[] = { +#define TE_(x) NULL }; +#define S_(x) x, +#include "common_perm_to_string.h" +#undef TB_ +#undef TE_ +#undef S_ + +struct common { + char *cname; + char **perms; +}; +struct common common[] = { +#define TB_(x) { #x, x }, +#define S_(x) +#define TE_(x) +#include "common_perm_to_string.h" +#undef TB_ +#undef TE_ +#undef S_ +}; + +#define S_(x, y, z) {x, #y}, +struct av_inherit { + int class; + char *common; +}; +struct av_inherit av_inherit[] = { +#include "av_inherit.h" +}; +#undef S_ + +#include "av_permissions.h" +#define S_(x, y, z) {x, y, z}, +struct av_perms { + int class; + int perm_i; + char *perm_s; +}; +struct av_perms av_perms[] = { +#include "av_perm_to_string.h" +}; +#undef S_ + +int main(int argc, char *argv[]) +{ + int i, j, mls = 0; + char **arg, *polout, *ctxout; + int classlist_len, initial_sid_to_string_len; + FILE *fout; + + if (argc < 3) + usage(argv[0]); + arg = argv+1; + if (argc==4 && strcmp(argv[1], "-m") == 0) { + mls = 1; + arg++; + } + polout = *arg++; + ctxout = *arg; + + fout = fopen(polout, "w"); + if (!fout) { + printf("Could not open %s for writing\n", polout); + usage(argv[0]); + } + + classlist_len = sizeof(classlist) / sizeof(char *); + /* print out the classes */ + for (i=1; i < classlist_len; i++) { + if(classlist[i]) + fprintf(fout, "class %s\n", classlist[i]); + else + fprintf(fout, "class user%d\n", i); + } + fprintf(fout, "\n"); + + initial_sid_to_string_len = sizeof(initial_sid_to_string) / sizeof (char *); + /* print out the sids */ + for (i=1; i < initial_sid_to_string_len; i++) + fprintf(fout, "sid %s\n", initial_sid_to_string[i]); + fprintf(fout, "\n"); + + /* print out the commons */ + for (i=0; i< sizeof(common)/sizeof(struct common); i++) { + char cname[101]; + find_common_name(common[i].cname, cname, 100); + cname[100] = '\0'; + fprintf(fout, "common %s\n{\n", cname); + for (j=0; common[i].perms[j]; j++) + fprintf(fout, "\t%s\n", common[i].perms[j]); + fprintf(fout, "}\n\n"); + } + fprintf(fout, "\n"); + + /* print out the class permissions */ + for (i=1; i < classlist_len; i++) { + if (classlist[i]) { + int firstperm = -1, numperms = 0; + + fprintf(fout, "class %s\n", classlist[i]); + /* does it inherit from a common? */ + for (j=0; j < sizeof(av_inherit)/sizeof(struct av_inherit); j++) + if (av_inherit[j].class == i) + fprintf(fout, "inherits %s\n", av_inherit[j].common); + + for (j=0; j < sizeof(av_perms)/sizeof(struct av_perms); j++) { + if (av_perms[j].class == i) { + if (firstperm == -1) + firstperm = j; + numperms++; + } + } + if (!numperms) { + fprintf(fout, "\n"); + continue; + } + + fprintf(fout, "{\n"); + /* print out the av_perms */ + for (j=0; j < numperms; j++) { + fprintf(fout, "\t%s\n", av_perms[firstperm+j].perm_s); + } + fprintf(fout, "}\n\n"); + } + } + fprintf(fout, "\n"); + + /* NOW PRINT OUT MLS STUFF */ + if (mls) { + printf("MLS not yet implemented\n"); + exit(1); + } + + /* types, roles, and allows */ + fprintf(fout, "type base_t;\n"); + fprintf(fout, "role base_r types { base_t };\n"); + for (i=1; i < classlist_len; i++) { + if (classlist[i]) + fprintf(fout, "allow base_t base_t:%s *;\n", classlist[i]); + else + fprintf(fout, "allow base_t base_t:user%d *;\n", i); + } + fprintf(fout, "user user_u roles { base_r };\n"); + fprintf(fout, "\n"); + + /* default sids */ + for (i=1; i < initial_sid_to_string_len; i++) + fprintf(fout, "sid %s user_u:base_r:base_t\n", initial_sid_to_string[i]); + fprintf(fout, "\n"); + + + fprintf(fout, "fs_use_xattr ext2 user_u:base_r:base_t;\n"); + fprintf(fout, "fs_use_xattr ext3 user_u:base_r:base_t;\n"); + fprintf(fout, "fs_use_xattr jfs user_u:base_r:base_t;\n"); + fprintf(fout, "fs_use_xattr xfs user_u:base_r:base_t;\n"); + fprintf(fout, "fs_use_xattr reiserfs user_u:base_r:base_t;\n"); + + fprintf(fout, "fs_use_task pipefs user_u:base_r:base_t;\n"); + fprintf(fout, "fs_use_task sockfs user_u:base_r:base_t;\n"); + + fprintf(fout, "fs_use_trans devpts user_u:base_r:base_t;\n"); + fprintf(fout, "fs_use_trans tmpfs user_u:base_r:base_t;\n"); + fprintf(fout, "fs_use_trans shm user_u:base_r:base_t;\n"); + + fprintf(fout, "genfscon proc / user_u:base_r:base_t\n"); + + fclose(fout); + + fout = fopen(ctxout, "w"); + if (!fout) { + printf("Wrote policy, but cannot open %s for writing\n", ctxout); + usage(argv[0]); + } + fprintf(fout, "/ user_u:base_r:base_t\n"); + fprintf(fout, "/.* user_u:base_r:base_t\n"); + fclose(fout); + + return 0; +} |