diff options
| -rwxr-xr-x | scripts/selinux/install_policy.sh | 92 | ||||
| -rw-r--r-- | scripts/selinux/mdp/mdp.c | 165 |
2 files changed, 194 insertions, 63 deletions
diff --git a/scripts/selinux/install_policy.sh b/scripts/selinux/install_policy.sh index 0b86c47baf7d..2dccf141241d 100755 --- a/scripts/selinux/install_policy.sh +++ b/scripts/selinux/install_policy.sh @@ -1,30 +1,61 @@ #!/bin/sh # SPDX-License-Identifier: GPL-2.0 +set -e 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 + echo "Could not find setfiles" + echo "Do you have policycoreutils installed?" + exit 1 fi -cd mdp - CP=`which checkpolicy` +if [ $? -eq 1 ]; then + echo "Could not find checkpolicy" + echo "Do you have checkpolicy installed?" + exit 1 +fi VERS=`$CP -V | awk '{print $1}'` -./mdp policy.conf file_contexts -$CP -o policy.$VERS policy.conf +ENABLED=`which selinuxenabled` +if [ $? -eq 1 ]; then + echo "Could not find selinuxenabled" + echo "Do you have libselinux-utils installed?" + exit 1 +fi + +if selinuxenabled; then + echo "SELinux is already enabled" + echo "This prevents safely relabeling all files." + echo "Boot with selinux=0 on the kernel command-line or" + echo "SELINUX=disabled in /etc/selinux/config." + exit 1 +fi + +cd mdp +./mdp -m policy.conf file_contexts +$CP -U allow -M -o policy.$VERS policy.conf mkdir -p /etc/selinux/dummy/policy mkdir -p /etc/selinux/dummy/contexts/files +echo "__default__:user_u:s0" > /etc/selinux/dummy/seusers +echo "base_r:base_t:s0" > /etc/selinux/dummy/contexts/failsafe_context +echo "base_r:base_t:s0 base_r:base_t:s0" > /etc/selinux/dummy/default_contexts +cat > /etc/selinux/dummy/contexts/x_contexts <<EOF +client * user_u:base_r:base_t:s0 +property * user_u:object_r:base_t:s0 +extension * user_u:object_r:base_t:s0 +selection * user_u:object_r:base_t:s0 +event * user_u:object_r:base_t:s0 +EOF +touch /etc/selinux/dummy/contexts/virtual_domain_context +touch /etc/selinux/dummy/contexts/virtual_image_context + cp file_contexts /etc/selinux/dummy/contexts/files cp dbus_contexts /etc/selinux/dummy/contexts cp policy.$VERS /etc/selinux/dummy/policy @@ -33,37 +64,22 @@ 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 +if [ -f /etc/selinux/config ]; then + echo "/etc/selinux/config exists, moving to /etc/selinux/config.bak." + mv /etc/selinux/config /etc/selinux/config.bak +fi +echo "Creating new /etc/selinux/config for dummy policy." +cat > /etc/selinux/config << EOF +SELINUX=permissive 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 / +$SF -F file_contexts / -mounts=`cat /proc/$$/mounts | egrep "ext2|ext3|xfs|jfs|ext4|ext4dev|gfs2" | awk '{ print $2 '}` -$SF file_contexts $mounts +mounts=`cat /proc/$$/mounts | \ + egrep "ext[234]|jfs|xfs|reiserfs|jffs2|gfs2|btrfs|f2fs|ocfs2" | \ + awk '{ print $2 '}` +$SF -F 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 +echo "-F" > /.autorelabel diff --git a/scripts/selinux/mdp/mdp.c b/scripts/selinux/mdp/mdp.c index 073fe7537f6c..edaba8e51651 100644 --- a/scripts/selinux/mdp/mdp.c +++ b/scripts/selinux/mdp/mdp.c @@ -33,6 +33,7 @@ #include <unistd.h> #include <string.h> #include <sys/socket.h> +#include <linux/kconfig.h> static void usage(char *name) { @@ -95,10 +96,31 @@ int main(int argc, char *argv[]) } fprintf(fout, "\n"); - /* NOW PRINT OUT MLS STUFF */ + /* print out mls declarations and constraints */ if (mls) { - printf("MLS not yet implemented\n"); - exit(1); + fprintf(fout, "sensitivity s0;\n"); + fprintf(fout, "sensitivity s1;\n"); + fprintf(fout, "dominance { s0 s1 }\n"); + fprintf(fout, "category c0;\n"); + fprintf(fout, "category c1;\n"); + fprintf(fout, "level s0:c0.c1;\n"); + fprintf(fout, "level s1:c0.c1;\n"); +#define SYSTEMLOW "s0" +#define SYSTEMHIGH "s1:c0.c1" + for (i = 0; secclass_map[i].name; i++) { + struct security_class_mapping *map = &secclass_map[i]; + + fprintf(fout, "mlsconstrain %s {\n", map->name); + for (j = 0; map->perms[j]; j++) + fprintf(fout, "\t%s\n", map->perms[j]); + /* + * This requires all subjects and objects to be + * single-level (l2 eq h2), and that the subject + * level dominate the object level (h1 dom h2) + * in order to have any permissions to it. + */ + fprintf(fout, "} (l2 eq h2 and h1 dom h2);\n\n"); + } } /* types, roles, and allows */ @@ -108,34 +130,127 @@ int main(int argc, char *argv[]) for (i = 0; secclass_map[i].name; i++) fprintf(fout, "allow base_t base_t:%s *;\n", secclass_map[i].name); - fprintf(fout, "user user_u roles { base_r };\n"); - fprintf(fout, "\n"); + fprintf(fout, "user user_u roles { base_r }"); + if (mls) + fprintf(fout, " level %s range %s - %s", SYSTEMLOW, + SYSTEMLOW, SYSTEMHIGH); + fprintf(fout, ";\n"); + +#define SUBJUSERROLETYPE "user_u:base_r:base_t" +#define OBJUSERROLETYPE "user_u:object_r:base_t" /* 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, "sid %s " SUBJUSERROLETYPE "%s\n", + initial_sid_to_string[i], mls ? ":" SYSTEMLOW : ""); 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 ext4 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_xattr jffs2 user_u:base_r:base_t;\n"); - fprintf(fout, "fs_use_xattr gfs2 user_u:base_r:base_t;\n"); +#define FS_USE(behavior, fstype) \ + fprintf(fout, "fs_use_%s %s " OBJUSERROLETYPE "%s;\n", \ + behavior, fstype, mls ? ":" SYSTEMLOW : "") + + /* + * Filesystems whose inode labels can be fetched via getxattr. + */ +#ifdef CONFIG_EXT2_FS_SECURITY + FS_USE("xattr", "ext2"); +#endif +#ifdef CONFIG_EXT4_FS_SECURITY +#ifdef CONFIG_EXT4_USE_FOR_EXT2 + FS_USE("xattr", "ext2"); +#endif + FS_USE("xattr", "ext3"); + FS_USE("xattr", "ext4"); +#endif +#ifdef CONFIG_JFS_SECURITY + FS_USE("xattr", "jfs"); +#endif +#ifdef CONFIG_REISERFS_FS_SECURITY + FS_USE("xattr", "reiserfs"); +#endif +#ifdef CONFIG_JFFS2_FS_SECURITY + FS_USE("xattr", "jffs2"); +#endif +#ifdef CONFIG_XFS_FS + FS_USE("xattr", "xfs"); +#endif +#ifdef CONFIG_GFS2_FS + FS_USE("xattr", "gfs2"); +#endif +#ifdef CONFIG_BTRFS_FS + FS_USE("xattr", "btrfs"); +#endif +#ifdef CONFIG_F2FS_FS_SECURITY + FS_USE("xattr", "f2fs"); +#endif +#ifdef CONFIG_OCFS2_FS + FS_USE("xattr", "ocsfs2"); +#endif +#ifdef CONFIG_OVERLAY_FS + FS_USE("xattr", "overlay"); +#endif +#ifdef CONFIG_SQUASHFS_XATTR + FS_USE("xattr", "squashfs"); +#endif + + /* + * Filesystems whose inodes are labeled from allocating task. + */ + FS_USE("task", "pipefs"); + FS_USE("task", "sockfs"); - fprintf(fout, "fs_use_task eventpollfs 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"); + /* + * Filesystems whose inode labels are computed from both + * the allocating task and the superblock label. + */ +#ifdef CONFIG_UNIX98_PTYS + FS_USE("trans", "devpts"); +#endif +#ifdef CONFIG_HUGETLBFS + FS_USE("trans", "hugetlbfs"); +#endif +#ifdef CONFIG_TMPFS + FS_USE("trans", "tmpfs"); +#endif +#ifdef CONFIG_DEVTMPFS + FS_USE("trans", "devtmpfs"); +#endif +#ifdef CONFIG_POSIX_MQUEUE + FS_USE("trans", "mqueue"); +#endif - fprintf(fout, "fs_use_trans mqueue 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 hugetlbfs 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"); +#define GENFSCON(fstype, prefix) \ + fprintf(fout, "genfscon %s %s " OBJUSERROLETYPE "%s\n", \ + fstype, prefix, mls ? ":" SYSTEMLOW : "") - fprintf(fout, "genfscon proc / user_u:base_r:base_t\n"); + /* + * Filesystems whose inodes are labeled from path prefix match + * relative to the filesystem root. Depending on the filesystem, + * only a single label for all inodes may be supported. Here + * we list the filesystem types for which per-file labeling is + * supported using genfscon; any other filesystem type can also + * be added by only with a single entry for all of its inodes. + */ +#ifdef CONFIG_PROC_FS + GENFSCON("proc", "/"); +#endif +#ifdef CONFIG_SECURITY_SELINUX + GENFSCON("selinuxfs", "/"); +#endif +#ifdef CONFIG_SYSFS + GENFSCON("sysfs", "/"); +#endif +#ifdef CONFIG_DEBUG_FS + GENFSCON("debugfs", "/"); +#endif +#ifdef CONFIG_TRACING + GENFSCON("tracefs", "/"); +#endif +#ifdef CONFIG_PSTORE + GENFSCON("pstore", "/"); +#endif + GENFSCON("cgroup", "/"); + GENFSCON("cgroup2", "/"); fclose(fout); @@ -144,8 +259,8 @@ int main(int argc, char *argv[]) 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"); + fprintf(fout, "/ " OBJUSERROLETYPE "%s\n", mls ? ":" SYSTEMLOW : ""); + fprintf(fout, "/.* " OBJUSERROLETYPE "%s\n", mls ? ":" SYSTEMLOW : ""); fclose(fout); return 0; |