diff options
Diffstat (limited to 'scripts/selinux')
| -rw-r--r-- | scripts/selinux/Makefile | 4 | ||||
| -rw-r--r-- | scripts/selinux/README | 2 | ||||
| -rw-r--r-- | scripts/selinux/genheaders/.gitignore | 1 | ||||
| -rw-r--r-- | scripts/selinux/genheaders/Makefile | 5 | ||||
| -rw-r--r-- | scripts/selinux/genheaders/genheaders.c | 138 | ||||
| -rwxr-xr-x[-rw-r--r--] | scripts/selinux/install_policy.sh | 96 | ||||
| -rw-r--r-- | scripts/selinux/mdp/.gitignore | 2 | ||||
| -rw-r--r-- | scripts/selinux/mdp/Makefile | 10 | ||||
| -rw-r--r-- | scripts/selinux/mdp/mdp.c | 207 |
9 files changed, 227 insertions, 238 deletions
diff --git a/scripts/selinux/Makefile b/scripts/selinux/Makefile index e8049da1831f..4b1308fa5732 100644 --- a/scripts/selinux/Makefile +++ b/scripts/selinux/Makefile @@ -1,2 +1,2 @@ -subdir-y := mdp genheaders -subdir- += mdp genheaders +# SPDX-License-Identifier: GPL-2.0-only +subdir-y := mdp diff --git a/scripts/selinux/README b/scripts/selinux/README index 4d020ecb7524..5ba679c5be18 100644 --- a/scripts/selinux/README +++ b/scripts/selinux/README @@ -1,2 +1,2 @@ -Please see Documentation/security/SELinux.txt for information on +Please see Documentation/admin-guide/LSM/SELinux.rst for information on installing a dummy SELinux policy. diff --git a/scripts/selinux/genheaders/.gitignore b/scripts/selinux/genheaders/.gitignore deleted file mode 100644 index 4c0b646ff8d5..000000000000 --- a/scripts/selinux/genheaders/.gitignore +++ /dev/null @@ -1 +0,0 @@ -genheaders diff --git a/scripts/selinux/genheaders/Makefile b/scripts/selinux/genheaders/Makefile deleted file mode 100644 index 417b165008ee..000000000000 --- a/scripts/selinux/genheaders/Makefile +++ /dev/null @@ -1,5 +0,0 @@ -hostprogs-y := genheaders -HOST_EXTRACFLAGS += -Isecurity/selinux/include - -always := $(hostprogs-y) -clean-files := $(hostprogs-y) diff --git a/scripts/selinux/genheaders/genheaders.c b/scripts/selinux/genheaders/genheaders.c deleted file mode 100644 index 539855ff31f9..000000000000 --- a/scripts/selinux/genheaders/genheaders.c +++ /dev/null @@ -1,138 +0,0 @@ -#include <stdio.h> -#include <stdlib.h> -#include <unistd.h> -#include <string.h> -#include <errno.h> -#include <ctype.h> - -struct security_class_mapping { - const char *name; - const char *perms[sizeof(unsigned) * 8 + 1]; -}; - -#include "classmap.h" -#include "initial_sid_to_string.h" - -#define max(x, y) (((int)(x) > (int)(y)) ? x : y) - -const char *progname; - -static void usage(void) -{ - printf("usage: %s flask.h av_permissions.h\n", progname); - exit(1); -} - -static char *stoupperx(const char *s) -{ - char *s2 = strdup(s); - char *p; - - if (!s2) { - fprintf(stderr, "%s: out of memory\n", progname); - exit(3); - } - - for (p = s2; *p; p++) - *p = toupper(*p); - return s2; -} - -int main(int argc, char *argv[]) -{ - int i, j, k; - int isids_len; - FILE *fout; - const char *needle = "SOCKET"; - char *substr; - - progname = argv[0]; - - if (argc < 3) - usage(); - - fout = fopen(argv[1], "w"); - if (!fout) { - fprintf(stderr, "Could not open %s for writing: %s\n", - argv[1], strerror(errno)); - exit(2); - } - - for (i = 0; secclass_map[i].name; i++) { - struct security_class_mapping *map = &secclass_map[i]; - map->name = stoupperx(map->name); - for (j = 0; map->perms[j]; j++) - map->perms[j] = stoupperx(map->perms[j]); - } - - isids_len = sizeof(initial_sid_to_string) / sizeof (char *); - for (i = 1; i < isids_len; i++) - initial_sid_to_string[i] = stoupperx(initial_sid_to_string[i]); - - fprintf(fout, "/* This file is automatically generated. Do not edit. */\n"); - fprintf(fout, "#ifndef _SELINUX_FLASK_H_\n#define _SELINUX_FLASK_H_\n\n"); - - for (i = 0; secclass_map[i].name; i++) { - struct security_class_mapping *map = &secclass_map[i]; - fprintf(fout, "#define SECCLASS_%s", map->name); - for (j = 0; j < max(1, 40 - strlen(map->name)); j++) - fprintf(fout, " "); - fprintf(fout, "%2d\n", i+1); - } - - fprintf(fout, "\n"); - - for (i = 1; i < isids_len; i++) { - const char *s = initial_sid_to_string[i]; - fprintf(fout, "#define SECINITSID_%s", s); - for (j = 0; j < max(1, 40 - strlen(s)); j++) - fprintf(fout, " "); - fprintf(fout, "%2d\n", i); - } - fprintf(fout, "\n#define SECINITSID_NUM %d\n", i-1); - fprintf(fout, "\nstatic inline bool security_is_socket_class(u16 kern_tclass)\n"); - fprintf(fout, "{\n"); - fprintf(fout, "\tbool sock = false;\n\n"); - fprintf(fout, "\tswitch (kern_tclass) {\n"); - for (i = 0; secclass_map[i].name; i++) { - struct security_class_mapping *map = &secclass_map[i]; - substr = strstr(map->name, needle); - if (substr && strcmp(substr, needle) == 0) - fprintf(fout, "\tcase SECCLASS_%s:\n", map->name); - } - fprintf(fout, "\t\tsock = true;\n"); - fprintf(fout, "\t\tbreak;\n"); - fprintf(fout, "\tdefault:\n"); - fprintf(fout, "\t\tbreak;\n"); - fprintf(fout, "\t}\n\n"); - fprintf(fout, "\treturn sock;\n"); - fprintf(fout, "}\n"); - - fprintf(fout, "\n#endif\n"); - fclose(fout); - - fout = fopen(argv[2], "w"); - if (!fout) { - fprintf(stderr, "Could not open %s for writing: %s\n", - argv[2], strerror(errno)); - exit(4); - } - - fprintf(fout, "/* This file is automatically generated. Do not edit. */\n"); - fprintf(fout, "#ifndef _SELINUX_AV_PERMISSIONS_H_\n#define _SELINUX_AV_PERMISSIONS_H_\n\n"); - - for (i = 0; secclass_map[i].name; i++) { - struct security_class_mapping *map = &secclass_map[i]; - for (j = 0; map->perms[j]; j++) { - fprintf(fout, "#define %s__%s", map->name, - map->perms[j]); - for (k = 0; k < max(1, 40 - strlen(map->name) - strlen(map->perms[j])); k++) - fprintf(fout, " "); - fprintf(fout, "0x%08xUL\n", (1<<j)); - } - } - - fprintf(fout, "\n#endif\n"); - fclose(fout); - exit(0); -} diff --git a/scripts/selinux/install_policy.sh b/scripts/selinux/install_policy.sh index 7b9ccf61f8f9..77368a73f111 100644..100755 --- a/scripts/selinux/install_policy.sh +++ b/scripts/selinux/install_policy.sh @@ -1,29 +1,57 @@ #!/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 [ $? -eq 1 ]; then - if [ -f /sbin/setfiles ]; then - SF="/usr/setfiles" - else - echo "no selinux tools installed: setfiles" - exit 1 - fi -fi -cd mdp +SF=`which setfiles` || { + echo "Could not find setfiles" + echo "Do you have policycoreutils installed?" + exit 1 +} -CP=`which checkpolicy` +CP=`which checkpolicy` || { + echo "Could not find checkpolicy" + echo "Do you have checkpolicy installed?" + exit 1 +} VERS=`$CP -V | awk '{print $1}'` -./mdp policy.conf file_contexts -$CP -o policy.$VERS policy.conf +ENABLED=`which selinuxenabled` || { + echo "Could not find selinuxenabled" + echo "Do you have libselinux-utils installed?" + exit 1 +} + +if selinuxenabled; then + echo "SELinux is already enabled" + echo "This prevents safely relabeling all files." + echo "Boot with selinux=0 on the kernel command-line." + exit 1 +fi + +cd mdp +./mdp -m policy.conf file_contexts +$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 @@ -32,38 +60,22 @@ 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 / - -mounts=`cat /proc/$$/mounts | egrep "ext2|ext3|xfs|jfs|ext4|ext4dev|gfs2" | awk '{ print $2 '}` -$SF file_contexts $mounts +$SF -F file_contexts / +mounts=`cat /proc/$$/mounts | \ + grep -E "ext[234]|jfs|xfs|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 - $SF file_contexts /dev - mount --move /mnt /dev -fi - +echo "-F" > /.autorelabel diff --git a/scripts/selinux/mdp/.gitignore b/scripts/selinux/mdp/.gitignore index 654546d8dffd..a7482287e77f 100644 --- a/scripts/selinux/mdp/.gitignore +++ b/scripts/selinux/mdp/.gitignore @@ -1,2 +1,2 @@ -# Generated file +# SPDX-License-Identifier: GPL-2.0-only mdp diff --git a/scripts/selinux/mdp/Makefile b/scripts/selinux/mdp/Makefile index eb365b333441..673782e3212f 100644 --- a/scripts/selinux/mdp/Makefile +++ b/scripts/selinux/mdp/Makefile @@ -1,5 +1,7 @@ -hostprogs-y := mdp -HOST_EXTRACFLAGS += -Isecurity/selinux/include +# SPDX-License-Identifier: GPL-2.0 +hostprogs-always-y += mdp +HOST_EXTRACFLAGS += \ + -I$(srctree)/include \ + -I$(srctree)/security/selinux/include -I$(objtree)/include -always := $(hostprogs-y) -clean-files := $(hostprogs-y) policy.* file_contexts +clean-files := policy.* file_contexts diff --git a/scripts/selinux/mdp/mdp.c b/scripts/selinux/mdp/mdp.c index 62b34ce1f50d..ea7fbe595971 100644 --- a/scripts/selinux/mdp/mdp.c +++ b/scripts/selinux/mdp/mdp.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * * mdp - make dummy policy @@ -5,20 +6,6 @@ * 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> @@ -28,6 +15,7 @@ #include <stdlib.h> #include <unistd.h> #include <string.h> +#include <linux/kconfig.h> static void usage(char *name) { @@ -43,6 +31,9 @@ struct security_class_mapping { #include "classmap.h" #include "initial_sid_to_string.h" +#include "policycap_names.h" + +#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) int main(int argc, char *argv[]) { @@ -75,13 +66,19 @@ int main(int argc, char *argv[]) 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]); + for (i = 1; i < initial_sid_to_string_len; i++) { + const char *name = initial_sid_to_string[i]; + + if (name) + fprintf(fout, "sid %s\n", name); + else + fprintf(fout, "sid unused%d\n", i); + } fprintf(fout, "\n"); /* print out the class permissions */ for (i = 0; secclass_map[i].name; i++) { - struct security_class_mapping *map = &secclass_map[i]; + const struct security_class_mapping *map = &secclass_map[i]; fprintf(fout, "class %s\n", map->name); fprintf(fout, "{\n"); for (j = 0; map->perms[j]; j++) @@ -90,47 +87,169 @@ 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++) { + const 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"); + } } + /* enable all policy capabilities */ + for (i = 0; i < ARRAY_SIZE(selinux_policycap_names); i++) + fprintf(fout, "policycap %s;\n", selinux_policycap_names[i]); + /* types, roles, and allows */ fprintf(fout, "type base_t;\n"); + fprintf(fout, "role base_r;\n"); fprintf(fout, "role base_r types { base_t };\n"); 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]); + for (i = 1; i < initial_sid_to_string_len; i++) { + const char *name = initial_sid_to_string[i]; + + if (name) + fprintf(fout, "sid %s ", name); + else + fprintf(fout, "sid unused%d\n", i); + fprintf(fout, SUBJUSERROLETYPE "%s\n", + 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"); - fprintf(fout, "fs_use_xattr lustre 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_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); @@ -139,8 +258,8 @@ 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; |