This RFC patch takes the libselinux changes from AOSP master and merges them into the SELinux project source from https://github.com/SELinuxProject/selinux checkpolicy, libselinux and libsepol have been updated with the appropriate Android.mk files and licences. The majority of changes were minor and use ifdef/ifndef, however: 1) label_file.c from Android was renamed label_android_file.c as the changes between them were great (Android does not currently use the *.bin file_contexts file) There is a request to add this support to Android (see https://bitbucket.org/seandroid/wiki/wiki/ToDo), but left it until later (just in case this patch does not fly at all). 2) procattr.c has been modified to support both but looks messy. 3) Not all Android changes were added as they did not seem necessary, for example include/selinux/selinux.h was not modified. 4) libselinux/src/Makefile was modified to build the required modules. 5) The Android.mk file was modified to add src/enabled.c because callbacks.c calls is_selinux_enabled. Also for non-user TARGET_BUILD_VARIANT add booleans.c because external/ltrace/sysdeps/linux-gnu/trace.c requires security_get_boolean_active, otherwise booleans could be removed. These changes have been tested on Fedora 21 and Android master builds (eng and user) using the emulator with no problems (the external/checkpolicy, external/libselinux and external/libsepol projects were removed). The testing was not extensive and consisted of checking bootloading, labeling and running apps (Android) and checking the libselinux/sepol functions on Fedora. Signed-off-by: Richard Haines <richard_c_haines@xxxxxxxxxxxxxx> --- Android.mk | 3 +- checkpolicy/MODULE_LICENSE_GPL | 0 checkpolicy/NOTICE | 340 +++++++ libselinux/Android.mk | 108 +++ libselinux/MODULE_LICENSE_PUBLIC_DOMAIN | 0 libselinux/NOTICE | 21 + libselinux/include/selinux/android.h | 56 ++ libselinux/include/selinux/label.h | 9 + libselinux/src/Makefile | 57 +- libselinux/src/android.c | 1531 +++++++++++++++++++++++++++++++ libselinux/src/avc.c | 59 ++ libselinux/src/avc_internal.h | 4 + libselinux/src/booleans.c | 31 +- libselinux/src/canonicalize_context.c | 8 +- libselinux/src/checkAccess.c | 2 + libselinux/src/check_context.c | 7 +- libselinux/src/compute_av.c | 11 +- libselinux/src/compute_create.c | 19 +- libselinux/src/fgetfilecon.c | 7 +- libselinux/src/fsetfilecon.c | 8 + libselinux/src/get_initial_context.c | 7 +- libselinux/src/getfilecon.c | 7 +- libselinux/src/getpeercon.c | 7 +- libselinux/src/init.c | 11 +- libselinux/src/label.c | 81 +- libselinux/src/label_android_file.c | 776 ++++++++++++++++ libselinux/src/label_internal.h | 12 +- libselinux/src/lgetfilecon.c | 7 +- libselinux/src/load_policy.c | 4 + libselinux/src/lsetfilecon.c | 8 + libselinux/src/policy.h | 4 +- libselinux/src/procattr.c | 70 +- libselinux/src/selinux_internal.h | 2 + libselinux/src/setfilecon.c | 8 + libselinux/src/stringrep.c | 2 + libsepol/MODULE_LICENSE_LGPL | 0 libsepol/NOTICE | 504 ++++++++++ 37 files changed, 3764 insertions(+), 27 deletions(-) create mode 100644 checkpolicy/MODULE_LICENSE_GPL create mode 100644 checkpolicy/NOTICE create mode 100644 libselinux/Android.mk create mode 100644 libselinux/MODULE_LICENSE_PUBLIC_DOMAIN create mode 100644 libselinux/NOTICE create mode 100644 libselinux/include/selinux/android.h create mode 100644 libselinux/src/android.c create mode 100644 libselinux/src/label_android_file.c create mode 100644 libsepol/MODULE_LICENSE_LGPL create mode 100644 libsepol/NOTICE diff --git a/Android.mk b/Android.mk index 02f35a9..5053e7d 100644 --- a/Android.mk +++ b/Android.mk @@ -1,2 +1 @@ -# This empty Android.mk file will prevent the build system -# from building anything below this point. +include $(call all-subdir-makefiles) diff --git a/checkpolicy/MODULE_LICENSE_GPL b/checkpolicy/MODULE_LICENSE_GPL new file mode 100644 index 0000000..e69de29 diff --git a/checkpolicy/NOTICE b/checkpolicy/NOTICE new file mode 100644 index 0000000..5b6e7c6 --- /dev/null +++ b/checkpolicy/NOTICE @@ -0,0 +1,340 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc. + 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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If this is what you want to do, use the GNU Library General +Public License instead of this License. diff --git a/libselinux/Android.mk b/libselinux/Android.mk new file mode 100644 index 0000000..f47b4f2 --- /dev/null +++ b/libselinux/Android.mk @@ -0,0 +1,108 @@ +LOCAL_PATH:= $(call my-dir) + +# If debug then external/ltrace/sysdeps/linux-gnu/trace.c requires +# security_get_boolean_active, otherwise booleans could be removed. +ifneq ($(TARGET_BUILD_VARIANT),user) + ADD_SEBOOLEANS := src/booleans.c +endif + +common_SRC_FILES := \ + src/canonicalize_context.c \ + src/disable.c \ + src/enabled.c \ + src/fgetfilecon.c \ + src/fsetfilecon.c \ + src/getenforce.c \ + src/getfilecon.c \ + src/getpeercon.c \ + src/lgetfilecon.c \ + src/load_policy.c \ + src/lsetfilecon.c \ + src/policyvers.c \ + src/procattr.c \ + src/setenforce.c \ + src/setfilecon.c \ + src/context.c \ + src/mapping.c \ + src/stringrep.c \ + src/compute_create.c \ + src/compute_av.c \ + src/avc.c \ + src/avc_internal.c \ + src/avc_sidtab.c \ + src/get_initial_context.c \ + src/checkAccess.c \ + src/sestatus.c \ + src/deny_unknown.c + +common_HOST_FILES := \ + src/callbacks.c \ + src/check_context.c \ + src/freecon.c \ + src/init.c \ + src/label.c \ + src/label_android_file.c \ + src/label_android_property.c + +common_COPY_HEADERS_TO := selinux +common_COPY_HEADERS := include/selinux/selinux.h include/selinux/label.h include/selinux/context.h include/selinux/avc.h include/selinux/android.h + +include $(CLEAR_VARS) +LOCAL_SRC_FILES := $(common_SRC_FILES) $(common_HOST_FILES) src/android.c $(ADD_SEBOOLEANS) +LOCAL_MODULE:= libselinux +LOCAL_MODULE_TAGS := eng +LOCAL_STATIC_LIBRARIES := libmincrypt +LOCAL_C_INCLUDES := external/pcre +LOCAL_WHOLE_STATIC_LIBRARIES := libpcre +# 1003 corresponds to auditd, from system/core/logd/event.logtags +LOCAL_CFLAGS := -DAUDITD_LOG_TAG=1003 +# mapping.c has redundant check of array p_in->perms. +LOCAL_CLANG_CFLAGS += -Wno-pointer-bool-conversion + +include $(BUILD_STATIC_LIBRARY) + +include $(CLEAR_VARS) +LOCAL_CFLAGS := -DHOST + +ifeq ($(HOST_OS),darwin) +LOCAL_CFLAGS += -DDARWIN +endif + +LOCAL_SRC_FILES := $(common_HOST_FILES) src/enabled.c +LOCAL_MODULE:= libselinux +LOCAL_MODULE_TAGS := eng +LOCAL_WHOLE_STATIC_LIBRARIES := libpcre +LOCAL_C_INCLUDES := external/pcre +include $(BUILD_HOST_STATIC_LIBRARY) + +include $(CLEAR_VARS) +LOCAL_SRC_FILES := $(common_SRC_FILES) $(common_HOST_FILES) src/android.c $(ADD_SEBOOLEANS) +LOCAL_MODULE:= libselinux +LOCAL_MODULE_TAGS := eng +LOCAL_COPY_HEADERS_TO := $(common_COPY_HEADERS_TO) +LOCAL_COPY_HEADERS := $(common_COPY_HEADERS) +LOCAL_STATIC_LIBRARIES := libmincrypt +LOCAL_C_INCLUDES := external/pcre +LOCAL_SHARED_LIBRARIES := liblog libpcre +# 1003 corresponds to auditd, from system/core/logd/event.logtags +LOCAL_CFLAGS := -DAUDITD_LOG_TAG=1003 +# mapping.c has redundant check of array p_in->perms. +LOCAL_CLANG_CFLAGS += -Wno-pointer-bool-conversion + +include $(BUILD_SHARED_LIBRARY) + +include $(CLEAR_VARS) +LOCAL_CFLAGS := -DHOST + +ifeq ($(HOST_OS),darwin) +LOCAL_CFLAGS += -DDARWIN +endif + +LOCAL_SRC_FILES := $(common_HOST_FILES) src/enabled.c +LOCAL_MODULE:= libselinux +LOCAL_MODULE_TAGS := eng +LOCAL_COPY_HEADERS_TO := $(common_COPY_HEADERS_TO) +LOCAL_COPY_HEADERS := $(common_COPY_HEADERS) +LOCAL_WHOLE_STATIC_LIBRARIES := libpcre +LOCAL_C_INCLUDES := external/pcre +include $(BUILD_HOST_SHARED_LIBRARY) diff --git a/libselinux/MODULE_LICENSE_PUBLIC_DOMAIN b/libselinux/MODULE_LICENSE_PUBLIC_DOMAIN new file mode 100644 index 0000000..e69de29 diff --git a/libselinux/NOTICE b/libselinux/NOTICE new file mode 100644 index 0000000..d386268 --- /dev/null +++ b/libselinux/NOTICE @@ -0,0 +1,21 @@ +This library (libselinux) is public domain software, i.e. not copyrighted. + +Warranty Exclusion +------------------ +You agree that this software is a +non-commercially developed program that may contain "bugs" (as that +term is used in the industry) and that it may not function as intended. +The software is licensed "as is". NSA makes no, and hereby expressly +disclaims all, warranties, express, implied, statutory, or otherwise +with respect to the software, including noninfringement and the implied +warranties of merchantability and fitness for a particular purpose. + +Limitation of Liability +----------------------- +In no event will NSA be liable for any damages, including loss of data, +lost profits, cost of cover, or other special, incidental, +consequential, direct or indirect damages arising from the software or +the use thereof, however caused and on any theory of liability. This +limitation will apply even if NSA has been advised of the possibility +of such damage. You acknowledge that this is a reasonable allocation of +risk. diff --git a/libselinux/include/selinux/android.h b/libselinux/include/selinux/android.h new file mode 100644 index 0000000..b2f1ae8 --- /dev/null +++ b/libselinux/include/selinux/android.h @@ -0,0 +1,56 @@ +#ifndef _SELINUX_ANDROID_H_ +#define _SELINUX_ANDROID_H_ + +#include <stdbool.h> +#include <sys/types.h> +#include <unistd.h> + +#include <selinux/label.h> + +#ifdef __cplusplus +extern "C" { +#endif + +extern struct selabel_handle* selinux_android_file_context_handle(void); + +extern struct selabel_handle* selinux_android_prop_context_handle(void); + +extern struct selabel_handle* selinux_android_service_context_handle(void); + +extern void selinux_android_set_sehandle(const struct selabel_handle *hndl); + +extern int selinux_android_load_policy(void); + +extern int selinux_android_reload_policy(void); + +extern int selinux_android_setcontext(uid_t uid, + bool isSystemServer, + const char *seinfo, + const char *name); + +extern int selinux_android_setfilecon(const char *pkgdir, + const char *pkgname, + const char *seinfo, + uid_t uid); + +extern int selinux_log_callback(int type, const char *fmt, ...) + __attribute__ ((format(printf, 2, 3))); + +#define SELINUX_ANDROID_RESTORECON_NOCHANGE 1 +#define SELINUX_ANDROID_RESTORECON_VERBOSE 2 +#define SELINUX_ANDROID_RESTORECON_RECURSE 4 +#define SELINUX_ANDROID_RESTORECON_FORCE 8 +#define SELINUX_ANDROID_RESTORECON_DATADATA 16 +extern int selinux_android_restorecon(const char *file, unsigned int flags); + +extern int selinux_android_restorecon_pkgdir(const char *pkgdir, + const char *seinfo, + uid_t uid, + unsigned int flags); + +extern int selinux_android_seapp_context_reload(void); + +#ifdef __cplusplus +} +#endif +#endif diff --git a/libselinux/include/selinux/label.h b/libselinux/include/selinux/label.h index 672a7c2..cb3239c 100644 --- a/libselinux/include/selinux/label.h +++ b/libselinux/include/selinux/label.h @@ -8,6 +8,9 @@ #include <sys/types.h> #include <selinux/selinux.h> +#ifdef ANDROID +#include <stdbool.h> +#endif #ifdef __cplusplus extern "C" { @@ -96,6 +99,12 @@ int selabel_lookup(struct selabel_handle *handle, char **con, const char *key, int type); int selabel_lookup_raw(struct selabel_handle *handle, char **con, const char *key, int type); +#ifdef ANDROID +bool selabel_partial_match(struct selabel_handle *handle, const char *key); + +int selabel_lookup_best_match(struct selabel_handle *rec, char **con, + const char *key, const char **aliases, int type); +#endif /** * selabel_stats - log labeling operation statistics. diff --git a/libselinux/src/Makefile b/libselinux/src/Makefile index ac25c1f..f879aae 100644 --- a/libselinux/src/Makefile +++ b/libselinux/src/Makefile @@ -46,8 +46,63 @@ ifeq ($(DISABLE_BOOL),y) UNUSED_SRCS+=booleans.c endif +SRC_FILES := \ + audit2why.c \ + avc.c \ + avc_internal.c \ + avc_sidtab.c \ + booleans.c \ + callbacks.c \ + canonicalize_context.c \ + checkAccess.c \ + check_context.c \ + compute_av.c \ + compute_create.c \ + compute_member.c \ + compute_relabel.c \ + compute_user.c \ + context.c \ + deny_unknown.c \ + disable.c \ + enabled.c \ + fgetfilecon.c \ + freeconary.c \ + freecon.c \ + fsetfilecon.c \ + get_context_list.c \ + get_default_type.c \ + getenforce.c \ + getfilecon.c \ + get_initial_context.c \ + getpeercon.c \ + init.c \ + is_customizable_type.c \ + label.c \ + label_db.c \ + label_file.c \ + label_media.c \ + label_x.c \ + lgetfilecon.c \ + load_policy.c \ + lsetfilecon.c \ + mapping.c \ + matchmediacon.c \ + matchpathcon.c \ + policyvers.c \ + procattr.c \ + query_user_context.c \ + selinux_check_securetty_context.c \ + selinux_config.c \ + sestatus.c \ + setenforce.c \ + setexecfilecon.c \ + setfilecon.c \ + setrans_client.c \ + seusers.c \ + stringrep.c + GENERATED=$(SWIGCOUT) $(SWIGRUBYCOUT) selinuxswig_python_exception.i -SRCS= $(filter-out $(UNUSED_SRCS) $(GENERATED) audit2why.c, $(wildcard *.c)) +SRCS= $(filter-out $(UNUSED_SRCS) $(GENERATED) audit2why.c, $(SRC_FILES)) MAX_STACK_SIZE=32768 diff --git a/libselinux/src/android.c b/libselinux/src/android.c new file mode 100644 index 0000000..7ea2b05 --- /dev/null +++ b/libselinux/src/android.c @@ -0,0 +1,1531 @@ +#include <sys/types.h> +#include <unistd.h> +#include <string.h> +#include <stdio.h> +#include <stdlib.h> +#include <stdbool.h> +#include <ctype.h> +#include <errno.h> +#include <pwd.h> +#include <grp.h> +#include <sys/mman.h> +#include <sys/mount.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/xattr.h> +#include <fcntl.h> +#include <fts.h> +#include <selinux/selinux.h> +#include <selinux/context.h> +#include <selinux/android.h> +#include <selinux/label.h> +#include <selinux/avc.h> +#include <mincrypt/sha.h> +#include <private/android_filesystem_config.h> +#include <log/log.h> +#include "policy.h" +#include "callbacks.h" +#include "selinux_internal.h" +#include "label_internal.h" +#include <fnmatch.h> + +/* + * XXX Where should this configuration file be located? + * Needs to be accessible by zygote and installd when + * setting credentials for app processes and setting permissions + * on app data directories. + */ +static char const * const seapp_contexts_file[] = { + "/seapp_contexts", + "/data/security/current/seapp_contexts", + NULL }; + +static struct selinux_opt seopts[] = { + { SELABEL_OPT_PATH, "/file_contexts" }, + { SELABEL_OPT_PATH, "/data/security/current/file_contexts" }, + { 0, NULL } }; + +static const char *const sepolicy_file[] = { + "/sepolicy", + "/data/security/current/sepolicy", + NULL }; + +static struct selinux_opt seopts_prop[] = { + { SELABEL_OPT_PATH, "/property_contexts" }, + { SELABEL_OPT_PATH, "/data/security/current/property_contexts" }, + { 0, NULL } +}; + +static struct selinux_opt seopts_service[] = { + { SELABEL_OPT_PATH, "/service_contexts" }, + { SELABEL_OPT_PATH, "/data/security/current/service_contexts" }, + { 0, NULL } +}; + +enum levelFrom { + LEVELFROM_NONE, + LEVELFROM_APP, + LEVELFROM_USER, + LEVELFROM_ALL +}; + +#define POLICY_OVERRIDE_VERSION "/data/security/current/selinux_version" +#define POLICY_BASE_VERSION "/selinux_version" +static int policy_index = 0; + +static void set_policy_index(void) +{ + int fd_base = -1, fd_override = -1; + struct stat sb_base; + struct stat sb_override; + void *map_base, *map_override; + + policy_index = 0; + + fd_base = open(POLICY_BASE_VERSION, O_RDONLY | O_NOFOLLOW); + if (fd_base < 0) + return; + + if (fstat(fd_base, &sb_base) < 0) + goto close_base; + + fd_override = open(POLICY_OVERRIDE_VERSION, O_RDONLY | O_NOFOLLOW); + if (fd_override < 0) + goto close_base; + + if (fstat(fd_override, &sb_override) < 0) + goto close_override; + + if (sb_base.st_size != sb_override.st_size) + goto close_override; + + map_base = mmap(NULL, sb_base.st_size, PROT_READ, MAP_PRIVATE, fd_base, 0); + if (map_base == MAP_FAILED) + goto close_override; + + map_override = mmap(NULL, sb_override.st_size, PROT_READ, MAP_PRIVATE, fd_override, 0); + if (map_override == MAP_FAILED) + goto unmap_base; + + if (memcmp(map_base, map_override, sb_base.st_size) != 0) + goto unmap_override; + + if (access(sepolicy_file[1], R_OK) != 0) + goto unmap_override; + + if (access(seopts[1].value, R_OK) != 0) + goto unmap_override; + + if (access(seopts_prop[1].value, R_OK) != 0) + goto unmap_override; + + if (access(seopts_service[1].value, R_OK) != 0) + goto unmap_override; + + if (access(seapp_contexts_file[1], R_OK) != 0) + goto unmap_override; + + policy_index = 1; + +unmap_override: + munmap(map_override, sb_override.st_size); +unmap_base: + munmap(map_base, sb_base.st_size); +close_override: + close(fd_override); +close_base: + close(fd_base); + return; +} + +#if DEBUG +static char const * const levelFromName[] = { + "none", + "app", + "user", + "all" +}; +#endif + +struct prefix_str { + size_t len; + char *str; + char is_prefix; +}; + +static void free_prefix_str(struct prefix_str *p) +{ + if (!p) + return; + free(p->str); +} + +struct seapp_context { + /* input selectors */ + bool isSystemServer; + bool isOwnerSet; + bool isOwner; + struct prefix_str user; + char *seinfo; + struct prefix_str name; + struct prefix_str path; + /* outputs */ + char *domain; + char *type; + char *level; + enum levelFrom levelFrom; +}; + +static void free_seapp_context(struct seapp_context *s) +{ + if (!s) + return; + + free_prefix_str(&s->user); + free(s->seinfo); + free_prefix_str(&s->name); + free_prefix_str(&s->path); + free(s->domain); + free(s->type); + free(s->level); +} + +static bool seapp_contexts_dup = false; + +static int seapp_context_cmp(const void *A, const void *B) +{ + const struct seapp_context *const *sp1 = (const struct seapp_context *const *) A; + const struct seapp_context *const *sp2 = (const struct seapp_context *const *) B; + const struct seapp_context *s1 = *sp1, *s2 = *sp2; + bool dup; + + /* Give precedence to isSystemServer=true. */ + if (s1->isSystemServer != s2->isSystemServer) + return (s1->isSystemServer ? -1 : 1); + + /* Give precedence to a specified isOwner= over an unspecified isOwner=. */ + if (s1->isOwnerSet != s2->isOwnerSet) + return (s1->isOwnerSet ? -1 : 1); + + /* Give precedence to a specified user= over an unspecified user=. */ + if (s1->user.str && !s2->user.str) + return -1; + if (!s1->user.str && s2->user.str) + return 1; + + if (s1->user.str) { + /* Give precedence to a fixed user= string over a prefix. */ + if (s1->user.is_prefix != s2->user.is_prefix) + return (s2->user.is_prefix ? -1 : 1); + + /* Give precedence to a longer prefix over a shorter prefix. */ + if (s1->user.is_prefix && s1->user.len != s2->user.len) + return (s1->user.len > s2->user.len) ? -1 : 1; + } + + /* Give precedence to a specified seinfo= over an unspecified seinfo=. */ + if (s1->seinfo && !s2->seinfo) + return -1; + if (!s1->seinfo && s2->seinfo) + return 1; + + /* Give precedence to a specified name= over an unspecified name=. */ + if (s1->name.str && !s2->name.str) + return -1; + if (!s1->name.str && s2->name.str) + return 1; + + if (s1->name.str) { + /* Give precedence to a fixed name= string over a prefix. */ + if (s1->name.is_prefix != s2->name.is_prefix) + return (s2->name.is_prefix ? -1 : 1); + + /* Give precedence to a longer prefix over a shorter prefix. */ + if (s1->name.is_prefix && s1->name.len != s2->name.len) + return (s1->name.len > s2->name.len) ? -1 : 1; + } + + /* Give precedence to a specified path= over an unspecified path=. */ + if (s1->path.str && !s2->path.str) + return -1; + if (!s1->path.str && s2->path.str) + return 1; + + if (s1->path.str) { + /* Give precedence to a fixed path= string over a prefix. */ + if (s1->path.is_prefix != s2->path.is_prefix) + return (s2->path.is_prefix ? -1 : 1); + + /* Give precedence to a longer prefix over a shorter prefix. */ + if (s1->path.is_prefix && s1->path.len != s2->path.len) + return (s1->path.len > s2->path.len) ? -1 : 1; + } + + /* + * Check for a duplicated entry on the input selectors. + * We already compared isSystemServer, isOwnerSet, and isOwner above. + * We also have already checked that both entries specify the same + * string fields, so if s1 has a non-NULL string, then so does s2. + */ + dup = (!s1->user.str || !strcmp(s1->user.str, s2->user.str)) && + (!s1->seinfo || !strcmp(s1->seinfo, s2->seinfo)) && + (!s1->name.str || !strcmp(s1->name.str, s2->name.str)) && + (!s1->path.str || !strcmp(s1->path.str, s2->path.str)); + if (dup) { + seapp_contexts_dup = true; + selinux_log(SELINUX_ERROR, "seapp_contexts: Duplicated entry\n"); + if (s1->user.str) + selinux_log(SELINUX_ERROR, " user=%s\n", s1->user.str); + if (s1->seinfo) + selinux_log(SELINUX_ERROR, " seinfo=%s\n", s1->seinfo); + if (s1->name.str) + selinux_log(SELINUX_ERROR, " name=%s\n", s1->name.str); + if (s1->path.str) + selinux_log(SELINUX_ERROR, " path=%s\n", s1->path.str); + } + + /* Anything else has equal precedence. */ + return 0; +} + +static struct seapp_context **seapp_contexts = NULL; +static int nspec = 0; + +static void free_seapp_contexts(void) +{ + int n; + + if (!seapp_contexts) + return; + + for (n = 0; n < nspec; n++) + free_seapp_context(seapp_contexts[n]); + + free(seapp_contexts); + seapp_contexts = NULL; + nspec = 0; +} + +int selinux_android_seapp_context_reload(void) +{ + FILE *fp = NULL; + char line_buf[BUFSIZ]; + char *token; + unsigned lineno; + struct seapp_context *cur; + char *p, *name = NULL, *value = NULL, *saveptr; + size_t len; + int n, ret; + + set_policy_index(); + + fp = fopen(seapp_contexts_file[policy_index], "r"); + if (!fp) { + selinux_log(SELINUX_ERROR, "%s: could not open any seapp_contexts file", __FUNCTION__); + return -1; + } + + free_seapp_contexts(); + + nspec = 0; + while (fgets(line_buf, sizeof line_buf - 1, fp)) { + p = line_buf; + while (isspace(*p)) + p++; + if (*p == '#' || *p == 0) + continue; + nspec++; + } + + seapp_contexts = (struct seapp_context **) calloc(nspec, sizeof(struct seapp_context *)); + if (!seapp_contexts) + goto oom; + + rewind(fp); + nspec = 0; + lineno = 1; + while (fgets(line_buf, sizeof line_buf - 1, fp)) { + len = strlen(line_buf); + if (line_buf[len - 1] == '\n') + line_buf[len - 1] = 0; + p = line_buf; + while (isspace(*p)) + p++; + if (*p == '#' || *p == 0) + continue; + + cur = (struct seapp_context *) calloc(1, sizeof(struct seapp_context)); + if (!cur) + goto oom; + + token = strtok_r(p, " \t", &saveptr); + if (!token) { + free_seapp_context(cur); + goto err; + } + + while (1) { + name = token; + value = strchr(name, '='); + if (!value) { + free_seapp_context(cur); + goto err; + } + *value++ = 0; + + if (!strcasecmp(name, "isSystemServer")) { + if (!strcasecmp(value, "true")) + cur->isSystemServer = true; + else if (!strcasecmp(value, "false")) + cur->isSystemServer = false; + else { + free_seapp_context(cur); + goto err; + } + } else if (!strcasecmp(name, "isOwner")) { + cur->isOwnerSet = true; + if (!strcasecmp(value, "true")) + cur->isOwner = true; + else if (!strcasecmp(value, "false")) + cur->isOwner = false; + else { + free_seapp_context(cur); + goto err; + } + } else if (!strcasecmp(name, "user")) { + if (cur->user.str) { + free_seapp_context(cur); + goto err; + } + cur->user.str = strdup(value); + if (!cur->user.str) { + free_seapp_context(cur); + goto oom; + } + cur->user.len = strlen(cur->user.str); + if (cur->user.str[cur->user.len-1] == '*') + cur->user.is_prefix = 1; + } else if (!strcasecmp(name, "seinfo")) { + if (cur->seinfo) { + free_seapp_context(cur); + goto err; + } + cur->seinfo = strdup(value); + if (!cur->seinfo) { + free_seapp_context(cur); + goto oom; + } + } else if (!strcasecmp(name, "name")) { + if (cur->name.str) { + free_seapp_context(cur); + goto err; + } + cur->name.str = strdup(value); + if (!cur->name.str) { + free_seapp_context(cur); + goto oom; + } + cur->name.len = strlen(cur->name.str); + if (cur->name.str[cur->name.len-1] == '*') + cur->name.is_prefix = 1; + } else if (!strcasecmp(name, "domain")) { + if (cur->domain) { + free_seapp_context(cur); + goto err; + } + cur->domain = strdup(value); + if (!cur->domain) { + free_seapp_context(cur); + goto oom; + } + } else if (!strcasecmp(name, "type")) { + if (cur->type) { + free_seapp_context(cur); + goto err; + } + cur->type = strdup(value); + if (!cur->type) { + free_seapp_context(cur); + goto oom; + } + } else if (!strcasecmp(name, "levelFromUid")) { + if (cur->levelFrom) { + free_seapp_context(cur); + goto err; + } + if (!strcasecmp(value, "true")) + cur->levelFrom = LEVELFROM_APP; + else if (!strcasecmp(value, "false")) + cur->levelFrom = LEVELFROM_NONE; + else { + free_seapp_context(cur); + goto err; + } + } else if (!strcasecmp(name, "levelFrom")) { + if (cur->levelFrom) { + free_seapp_context(cur); + goto err; + } + if (!strcasecmp(value, "none")) + cur->levelFrom = LEVELFROM_NONE; + else if (!strcasecmp(value, "app")) + cur->levelFrom = LEVELFROM_APP; + else if (!strcasecmp(value, "user")) + cur->levelFrom = LEVELFROM_USER; + else if (!strcasecmp(value, "all")) + cur->levelFrom = LEVELFROM_ALL; + else { + free_seapp_context(cur); + goto err; + } + } else if (!strcasecmp(name, "level")) { + if (cur->level) { + free_seapp_context(cur); + goto err; + } + cur->level = strdup(value); + if (!cur->level) { + free_seapp_context(cur); + goto oom; + } + } else if (!strcasecmp(name, "path")) { + if (cur->path.str) { + free_seapp_context(cur); + goto err; + } + cur->path.str = strdup(value); + if (!cur->path.str) { + free_seapp_context(cur); + goto oom; + } + cur->path.len = strlen(cur->path.str); + if (cur->path.str[cur->path.len-1] == '*') + cur->path.is_prefix = 1; + } else { + free_seapp_context(cur); + goto err; + } + + token = strtok_r(NULL, " \t", &saveptr); + if (!token) + break; + } + + if (cur->name.str && + (!cur->seinfo || !strcmp(cur->seinfo, "default"))) { + selinux_log(SELINUX_ERROR, "%s: No specific seinfo value specified with name=\"%s\", on line %u: insecure configuration!\n", + seapp_contexts_file[policy_index], cur->name.str, lineno); + free_seapp_context(cur); + goto err; + } + + seapp_contexts[nspec] = cur; + nspec++; + lineno++; + } + + qsort(seapp_contexts, nspec, sizeof(struct seapp_context *), + seapp_context_cmp); + + if (seapp_contexts_dup) + goto err; + +#if DEBUG + { + int i; + for (i = 0; i < nspec; i++) { + cur = seapp_contexts[i]; + selinux_log(SELINUX_INFO, "%s: isSystemServer=%s isOwner=%s user=%s seinfo=%s name=%s path=%s -> domain=%s type=%s level=%s levelFrom=%s", + __FUNCTION__, + cur->isSystemServer ? "true" : "false", + cur->isOwnerSet ? (cur->isOwner ? "true" : "false") : "null", + cur->user.str, + cur->seinfo, cur->name.str, cur->path.str, cur->domain, + cur->type, cur->level, + levelFromName[cur->levelFrom]); + } + } +#endif + + ret = 0; + +out: + fclose(fp); + return ret; + +err: + selinux_log(SELINUX_ERROR, "%s: Invalid entry on line %u\n", + seapp_contexts_file[policy_index], lineno); + free_seapp_contexts(); + ret = -1; + goto out; +oom: + selinux_log(SELINUX_ERROR, + "%s: Out of memory\n", __FUNCTION__); + free_seapp_contexts(); + ret = -1; + goto out; +} + + +static void seapp_context_init(void) +{ + selinux_android_seapp_context_reload(); +} + +static pthread_once_t once = PTHREAD_ONCE_INIT; + +/* + * Max id that can be mapped to category set uniquely + * using the current scheme. + */ +#define CAT_MAPPING_MAX_ID (0x1<<16) + +enum seapp_kind { + SEAPP_TYPE, + SEAPP_DOMAIN +}; + +static int seapp_context_lookup(enum seapp_kind kind, + uid_t uid, + bool isSystemServer, + const char *seinfo, + const char *pkgname, + const char *path, + context_t ctx) +{ + bool isOwner; + const char *username = NULL; + struct seapp_context *cur = NULL; + int i; + size_t n; + uid_t userid; + uid_t appid; + + __selinux_once(once, seapp_context_init); + + userid = uid / AID_USER; + isOwner = (userid == 0); + appid = uid % AID_USER; + if (appid < AID_APP) { + for (n = 0; n < android_id_count; n++) { + if (android_ids[n].aid == appid) { + username = android_ids[n].name; + break; + } + } + if (!username) + goto err; + } else if (appid < AID_ISOLATED_START) { + username = "_app"; + appid -= AID_APP; + } else { + username = "_isolated"; + appid -= AID_ISOLATED_START; + } + + if (appid >= CAT_MAPPING_MAX_ID || userid >= CAT_MAPPING_MAX_ID) + goto err; + + for (i = 0; i < nspec; i++) { + cur = seapp_contexts[i]; + + if (cur->isSystemServer != isSystemServer) + continue; + + if (cur->isOwnerSet && cur->isOwner != isOwner) + continue; + + if (cur->user.str) { + if (cur->user.is_prefix) { + if (strncasecmp(username, cur->user.str, cur->user.len-1)) + continue; + } else { + if (strcasecmp(username, cur->user.str)) + continue; + } + } + + if (cur->seinfo) { + if (!seinfo || strcasecmp(seinfo, cur->seinfo)) + continue; + } + + if (cur->name.str) { + if(!pkgname) + continue; + + if (cur->name.is_prefix) { + if (strncasecmp(pkgname, cur->name.str, cur->name.len-1)) + continue; + } else { + if (strcasecmp(pkgname, cur->name.str)) + continue; + } + } + + if (cur->path.str) { + if (!path) + continue; + + if (cur->path.is_prefix) { + if (strncmp(path, cur->path.str, cur->path.len-1)) + continue; + } else { + if (strcmp(path, cur->path.str)) + continue; + } + } + + if (kind == SEAPP_TYPE && !cur->type) + continue; + else if (kind == SEAPP_DOMAIN && !cur->domain) + continue; + + if (kind == SEAPP_TYPE) { + if (context_type_set(ctx, cur->type)) + goto oom; + } else if (kind == SEAPP_DOMAIN) { + if (context_type_set(ctx, cur->domain)) + goto oom; + } + + if (cur->levelFrom != LEVELFROM_NONE) { + char level[255]; + switch (cur->levelFrom) { + case LEVELFROM_APP: + snprintf(level, sizeof level, "s0:c%u,c%u", + appid & 0xff, + 256 + (appid>>8 & 0xff)); + break; + case LEVELFROM_USER: + snprintf(level, sizeof level, "s0:c%u,c%u", + 512 + (userid & 0xff), + 768 + (userid>>8 & 0xff)); + break; + case LEVELFROM_ALL: + snprintf(level, sizeof level, "s0:c%u,c%u,c%u,c%u", + appid & 0xff, + 256 + (appid>>8 & 0xff), + 512 + (userid & 0xff), + 768 + (userid>>8 & 0xff)); + break; + default: + goto err; + } + if (context_range_set(ctx, level)) + goto oom; + } else if (cur->level) { + if (context_range_set(ctx, cur->level)) + goto oom; + } + + break; + } + + if (kind == SEAPP_DOMAIN && i == nspec) { + /* + * No match. + * Fail to prevent staying in the zygote's context. + */ + selinux_log(SELINUX_ERROR, + "%s: No match for app with uid %d, seinfo %s, name %s\n", + __FUNCTION__, uid, seinfo, pkgname); + + if (security_getenforce() == 1) + goto err; + } + + return 0; +err: + return -1; +oom: + return -2; +} + +int selinux_android_setfilecon(const char *pkgdir, + const char *pkgname, + const char *seinfo, + uid_t uid) +{ + char *orig_ctx_str = NULL; + char *ctx_str = NULL; + context_t ctx = NULL; + int rc = -1; + + if (is_selinux_enabled() <= 0) + return 0; + + rc = getfilecon(pkgdir, &ctx_str); + if (rc < 0) + goto err; + + ctx = context_new(ctx_str); + orig_ctx_str = ctx_str; + if (!ctx) + goto oom; + + rc = seapp_context_lookup(SEAPP_TYPE, uid, 0, seinfo, pkgname, NULL, ctx); + if (rc == -1) + goto err; + else if (rc == -2) + goto oom; + + ctx_str = context_str(ctx); + if (!ctx_str) + goto oom; + + rc = security_check_context(ctx_str); + if (rc < 0) + goto err; + + if (strcmp(ctx_str, orig_ctx_str)) { + rc = setfilecon(pkgdir, ctx_str); + if (rc < 0) + goto err; + } + + rc = 0; +out: + freecon(orig_ctx_str); + context_free(ctx); + return rc; +err: + selinux_log(SELINUX_ERROR, "%s: Error setting context for pkgdir %s, uid %d: %s\n", + __FUNCTION__, pkgdir, uid, strerror(errno)); + rc = -1; + goto out; +oom: + selinux_log(SELINUX_ERROR, "%s: Out of memory\n", __FUNCTION__); + rc = -1; + goto out; +} + +int selinux_android_setcontext(uid_t uid, + bool isSystemServer, + const char *seinfo, + const char *pkgname) +{ + char *orig_ctx_str = NULL, *ctx_str; + context_t ctx = NULL; + int rc = -1; + + if (is_selinux_enabled() <= 0) + return 0; + + rc = getcon(&ctx_str); + if (rc) + goto err; + + ctx = context_new(ctx_str); + orig_ctx_str = ctx_str; + if (!ctx) + goto oom; + + rc = seapp_context_lookup(SEAPP_DOMAIN, uid, isSystemServer, seinfo, pkgname, NULL, ctx); + if (rc == -1) + goto err; + else if (rc == -2) + goto oom; + + ctx_str = context_str(ctx); + if (!ctx_str) + goto oom; + + rc = security_check_context(ctx_str); + if (rc < 0) + goto err; + + if (strcmp(ctx_str, orig_ctx_str)) { + rc = setcon(ctx_str); + if (rc < 0) + goto err; + } + + rc = 0; +out: + freecon(orig_ctx_str); + context_free(ctx); + avc_netlink_close(); + return rc; +err: + if (isSystemServer) + selinux_log(SELINUX_ERROR, + "%s: Error setting context for system server: %s\n", + __FUNCTION__, strerror(errno)); + else + selinux_log(SELINUX_ERROR, + "%s: Error setting context for app with uid %d, seinfo %s: %s\n", + __FUNCTION__, uid, seinfo, strerror(errno)); + + rc = -1; + goto out; +oom: + selinux_log(SELINUX_ERROR, "%s: Out of memory\n", __FUNCTION__); + rc = -1; + goto out; +} + +static struct selabel_handle *fc_sehandle = NULL; +#define FC_DIGEST_SIZE SHA_DIGEST_SIZE +static uint8_t fc_digest[FC_DIGEST_SIZE]; + +static bool compute_contexts_hash(const struct selinux_opt opts[], uint8_t c_digest[]) +{ + int fd; + struct stat sb; + void *map; + + fd = open(opts[policy_index].value, O_CLOEXEC | O_RDONLY | O_NOFOLLOW); + if (fd < 0) { + selinux_log(SELINUX_ERROR, "SELinux: Could not open %s: %s\n", + opts[policy_index].value, strerror(errno)); + return false; + } + if (fstat(fd, &sb) < 0) { + selinux_log(SELINUX_ERROR, "SELinux: Could not stat %s: %s\n", + opts[policy_index].value, strerror(errno)); + close(fd); + return false; + } + map = mmap(NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0); + if (map == MAP_FAILED) { + selinux_log(SELINUX_ERROR, "SELinux: Could not map %s: %s\n", + opts[policy_index].value, strerror(errno)); + close(fd); + return false; + } + SHA_hash(map, sb.st_size, c_digest); + munmap(map, sb.st_size); + close(fd); + + return true; +} + +static void file_context_init(void) +{ + if (!fc_sehandle) + fc_sehandle = selinux_android_file_context_handle(); +} + + + +static pthread_once_t fc_once = PTHREAD_ONCE_INIT; + +struct pkgInfo { + char *name; + uid_t uid; + bool debuggable; + char *dataDir; + char *seinfo; + struct pkgInfo *next; +}; + +#define PKGTAB_SIZE 256 +static struct pkgInfo *pkgTab[PKGTAB_SIZE]; + +static unsigned int pkghash(const char *pkgname) +{ + unsigned int h = 7; + for (; *pkgname; pkgname++) { + h = h * 31 + *pkgname; + } + return h & (PKGTAB_SIZE - 1); +} + +/* The file containing the list of installed packages on the system */ +#define PACKAGES_LIST_FILE "/data/system/packages.list" + +static void package_info_init(void) +{ + char *buf = NULL; + size_t buflen = 0; + ssize_t bytesread; + FILE *fp; + char *cur, *next; + struct pkgInfo *pkgInfo = NULL; + unsigned int hash; + unsigned long lineno = 1; + + fp = fopen(PACKAGES_LIST_FILE, "r"); + if (!fp) { + selinux_log(SELINUX_ERROR, "SELinux: Could not open %s: %s.\n", + PACKAGES_LIST_FILE, strerror(errno)); + return; + } + while ((bytesread = getline(&buf, &buflen, fp)) > 0) { + pkgInfo = calloc(1, sizeof(*pkgInfo)); + if (!pkgInfo) + goto err; + next = buf; + cur = strsep(&next, " \t\n"); + if (!cur) + goto err; + pkgInfo->name = strdup(cur); + if (!pkgInfo->name) + goto err; + cur = strsep(&next, " \t\n"); + if (!cur) + goto err; + pkgInfo->uid = atoi(cur); + if (!pkgInfo->uid) + goto err; + cur = strsep(&next, " \t\n"); + if (!cur) + goto err; + pkgInfo->debuggable = atoi(cur); + cur = strsep(&next, " \t\n"); + if (!cur) + goto err; + pkgInfo->dataDir = strdup(cur); + if (!pkgInfo->dataDir) + goto err; + cur = strsep(&next, " \t\n"); + if (!cur) + goto err; + pkgInfo->seinfo = strdup(cur); + if (!pkgInfo->seinfo) + goto err; + + hash = pkghash(pkgInfo->name); + if (pkgTab[hash]) + pkgInfo->next = pkgTab[hash]; + pkgTab[hash] = pkgInfo; + + lineno++; + } + +#if DEBUG + { + unsigned int buckets, entries, chainlen, longestchain; + + buckets = entries = longestchain = 0; + for (hash = 0; hash < PKGTAB_SIZE; hash++) { + if (pkgTab[hash]) { + buckets++; + chainlen = 0; + for (pkgInfo = pkgTab[hash]; pkgInfo; pkgInfo = pkgInfo->next) { + chainlen++; + selinux_log(SELINUX_INFO, "%s: name=%s uid=%u debuggable=%s dataDir=%s seinfo=%s\n", + __FUNCTION__, + pkgInfo->name, pkgInfo->uid, pkgInfo->debuggable ? "true" : "false", pkgInfo->dataDir, pkgInfo->seinfo); + } + entries += chainlen; + if (longestchain < chainlen) + longestchain = chainlen; + } + } + selinux_log(SELINUX_INFO, "SELinux: %d pkg entries and %d/%d buckets used, longest chain %d\n", entries, buckets, PKGTAB_SIZE, longestchain); + } +#endif + +out: + free(buf); + fclose(fp); + return; + +err: + selinux_log(SELINUX_ERROR, "SELinux: Error reading %s on line %lu.\n", + PACKAGES_LIST_FILE, lineno); + if (pkgInfo) { + free(pkgInfo->name); + free(pkgInfo->dataDir); + free(pkgInfo->seinfo); + free(pkgInfo); + } + goto out; +} + +static pthread_once_t pkg_once = PTHREAD_ONCE_INIT; + +struct pkgInfo *package_info_lookup(const char *name) +{ + struct pkgInfo *pkgInfo; + unsigned int hash; + + __selinux_once(pkg_once, package_info_init); + + hash = pkghash(name); + for (pkgInfo = pkgTab[hash]; pkgInfo; pkgInfo = pkgInfo->next) { + if (!strcmp(name, pkgInfo->name)) + return pkgInfo; + } + return NULL; +} + +/* The path prefixes of package data directories. */ +#define DATA_DATA_PATH "/data/data" +#define DATA_USER_PATH "/data/user" +#define EXPAND_USER_PATH "/mnt/expand/\?\?\?\?\?\?\?\?-\?\?\?\?-\?\?\?\?-\?\?\?\?-\?\?\?\?\?\?\?\?\?\?\?\?/user" +#define DATA_DATA_PREFIX DATA_DATA_PATH "/" +#define DATA_USER_PREFIX DATA_USER_PATH "/" + +static int pkgdir_selabel_lookup(const char *pathname, + const char *seinfo, + uid_t uid, + char **secontextp) +{ + char *pkgname = NULL, *end = NULL; + struct pkgInfo *pkgInfo = NULL; + char *secontext = *secontextp; + context_t ctx = NULL; + int rc = 0; + + /* Skip directory prefix before package name. */ + if (!strncmp(pathname, DATA_DATA_PREFIX, sizeof(DATA_DATA_PREFIX)-1)) { + pathname += sizeof(DATA_DATA_PREFIX) - 1; + } else if (!strncmp(pathname, DATA_USER_PREFIX, sizeof(DATA_USER_PREFIX)-1)) { + pathname += sizeof(DATA_USER_PREFIX) - 1; + while (isdigit(*pathname)) + pathname++; + if (*pathname == '/') + pathname++; + else + return 0; + } else if (!fnmatch(EXPAND_USER_PATH, pathname, FNM_LEADING_DIR|FNM_PATHNAME)) { + pathname += sizeof(EXPAND_USER_PATH); + while (isdigit(*pathname)) + pathname++; + if (*pathname == '/') + pathname++; + else + return 0; + } else + return 0; + + if (!(*pathname)) + return 0; + + pkgname = strdup(pathname); + if (!pkgname) + return -1; + + for (end = pkgname; *end && *end != '/'; end++) + ; + pathname = end; + if (*end) + pathname++; + *end = '\0'; + + if (!seinfo) { + pkgInfo = package_info_lookup(pkgname); + if (!pkgInfo) { + selinux_log(SELINUX_WARNING, "SELinux: Could not look up information for package %s, cannot restorecon %s.\n", + pkgname, pathname); + free(pkgname); + return -1; + } + } + + ctx = context_new(secontext); + if (!ctx) + goto err; + + rc = seapp_context_lookup(SEAPP_TYPE, pkgInfo ? pkgInfo->uid : uid, 0, + pkgInfo ? pkgInfo->seinfo : seinfo, pkgInfo ? pkgInfo->name : pkgname, pathname, ctx); + if (rc < 0) + goto err; + + secontext = context_str(ctx); + if (!secontext) + goto err; + + if (!strcmp(secontext, *secontextp)) + goto out; + + rc = security_check_context(secontext); + if (rc < 0) + goto err; + + freecon(*secontextp); + *secontextp = strdup(secontext); + if (!(*secontextp)) + goto err; + + rc = 0; + +out: + free(pkgname); + context_free(ctx); + return rc; +err: + selinux_log(SELINUX_ERROR, "%s: Error looking up context for path %s, pkgname %s, seinfo %s, uid %u: %s\n", + __FUNCTION__, pathname, pkgname, pkgInfo->seinfo, pkgInfo->uid, strerror(errno)); + rc = -1; + goto out; +} + +#define RESTORECON_LAST "security.restorecon_last" + +static int restorecon_sb(const char *pathname, const struct stat *sb, + bool nochange, bool verbose, + const char *seinfo, uid_t uid) +{ + char *secontext = NULL; + char *oldsecontext = NULL; + int rc = 0; + + if (selabel_lookup(fc_sehandle, &secontext, pathname, sb->st_mode) < 0) + return 0; /* no match, but not an error */ + + if (lgetfilecon(pathname, &oldsecontext) < 0) + goto err; + + /* + * For subdirectories of /data/data or /data/user, we ignore selabel_lookup() + * and use pkgdir_selabel_lookup() instead. Files within those directories + * have different labeling rules, based off of /seapp_contexts, and + * installd is responsible for managing these labels instead of init. + */ + if (!strncmp(pathname, DATA_DATA_PREFIX, sizeof(DATA_DATA_PREFIX)-1) || + !strncmp(pathname, DATA_USER_PREFIX, sizeof(DATA_USER_PREFIX)-1) || + !fnmatch(EXPAND_USER_PATH, pathname, FNM_LEADING_DIR|FNM_PATHNAME)) { + if (pkgdir_selabel_lookup(pathname, seinfo, uid, &secontext) < 0) + goto err; + } + + if (strcmp(oldsecontext, secontext) != 0) { + if (verbose) + selinux_log(SELINUX_INFO, + "SELinux: Relabeling %s from %s to %s.\n", pathname, oldsecontext, secontext); + if (!nochange) { + if (lsetfilecon(pathname, secontext) < 0) + goto err; + } + } + + rc = 0; + +out: + freecon(oldsecontext); + freecon(secontext); + return rc; + +err: + selinux_log(SELINUX_ERROR, + "SELinux: Could not set context for %s: %s\n", + pathname, strerror(errno)); + rc = -1; + goto out; +} + +#define SYS_PATH "/sys" +#define SYS_PREFIX SYS_PATH "/" + +static int selinux_android_restorecon_common(const char* pathname, + const char *seinfo, + uid_t uid, + unsigned int flags) +{ + bool nochange = (flags & SELINUX_ANDROID_RESTORECON_NOCHANGE) ? true : false; + bool verbose = (flags & SELINUX_ANDROID_RESTORECON_VERBOSE) ? true : false; + bool recurse = (flags & SELINUX_ANDROID_RESTORECON_RECURSE) ? true : false; + bool force = (flags & SELINUX_ANDROID_RESTORECON_FORCE) ? true : false; + bool datadata = (flags & SELINUX_ANDROID_RESTORECON_DATADATA) ? true : false; + bool issys = (!strcmp(pathname, SYS_PATH) || !strncmp(pathname, SYS_PREFIX, sizeof(SYS_PREFIX)-1)) ? true : false; + bool setrestoreconlast = true; + struct stat sb; + FTS *fts; + FTSENT *ftsent; + char *const paths[2] = { __UNCONST(pathname), NULL }; + int ftsflags = FTS_NOCHDIR | FTS_XDEV | FTS_PHYSICAL; + int error, sverrno; + char xattr_value[FC_DIGEST_SIZE]; + ssize_t size; + + if (is_selinux_enabled() <= 0) + return 0; + + __selinux_once(fc_once, file_context_init); + + if (!fc_sehandle) + return 0; + + if (!recurse) { + if (lstat(pathname, &sb) < 0) + return -1; + + return restorecon_sb(pathname, &sb, nochange, verbose, seinfo, uid); + } + + /* + * Ignore restorecon_last on /data/data or /data/user + * since their labeling is based on seapp_contexts and seinfo + * assignments rather than file_contexts and is managed by + * installd rather than init. + */ + if (!strncmp(pathname, DATA_DATA_PREFIX, sizeof(DATA_DATA_PREFIX)-1) || + !strncmp(pathname, DATA_USER_PREFIX, sizeof(DATA_USER_PREFIX)-1) || + !fnmatch(EXPAND_USER_PATH, pathname, FNM_LEADING_DIR|FNM_PATHNAME)) + setrestoreconlast = false; + + /* Also ignore on /sys since it is regenerated on each boot regardless. */ + if (issys) + setrestoreconlast = false; + + if (setrestoreconlast) { + size = getxattr(pathname, RESTORECON_LAST, xattr_value, sizeof fc_digest); + if (!force && size == sizeof fc_digest && memcmp(fc_digest, xattr_value, sizeof fc_digest) == 0) { + selinux_log(SELINUX_INFO, + "SELinux: Skipping restorecon_recursive(%s)\n", + pathname); + return 0; + } + } + + fts = fts_open(paths, ftsflags, NULL); + if (!fts) + return -1; + + error = 0; + while ((ftsent = fts_read(fts)) != NULL) { + switch (ftsent->fts_info) { + case FTS_DC: + selinux_log(SELINUX_ERROR, + "SELinux: Directory cycle on %s.\n", ftsent->fts_path); + errno = ELOOP; + error = -1; + goto out; + case FTS_DP: + continue; + case FTS_DNR: + selinux_log(SELINUX_ERROR, + "SELinux: Could not read %s: %s.\n", ftsent->fts_path, strerror(errno)); + fts_set(fts, ftsent, FTS_SKIP); + continue; + case FTS_NS: + selinux_log(SELINUX_ERROR, + "SELinux: Could not stat %s: %s.\n", ftsent->fts_path, strerror(errno)); + fts_set(fts, ftsent, FTS_SKIP); + continue; + case FTS_ERR: + selinux_log(SELINUX_ERROR, + "SELinux: Error on %s: %s.\n", ftsent->fts_path, strerror(errno)); + fts_set(fts, ftsent, FTS_SKIP); + continue; + case FTS_D: + if (issys && !selabel_partial_match(fc_sehandle, ftsent->fts_path)) { + fts_set(fts, ftsent, FTS_SKIP); + continue; + } + + if (!datadata && + (!strcmp(ftsent->fts_path, DATA_DATA_PATH) || + !strncmp(ftsent->fts_path, DATA_USER_PREFIX, sizeof(DATA_USER_PREFIX)-1) || + !fnmatch(EXPAND_USER_PATH, ftsent->fts_path, FNM_LEADING_DIR|FNM_PATHNAME))) { + // Don't label anything below this directory. + fts_set(fts, ftsent, FTS_SKIP); + // but fall through and make sure we label the directory itself + } + /* fall through */ + default: + error |= restorecon_sb(ftsent->fts_path, ftsent->fts_statp, nochange, verbose, seinfo, uid); + break; + } + } + + // Labeling successful. Mark the top level directory as completed. + if (setrestoreconlast && !nochange && !error) + setxattr(pathname, RESTORECON_LAST, fc_digest, sizeof fc_digest, 0); + +out: + sverrno = errno; + (void) fts_close(fts); + errno = sverrno; + return error; +} + +int selinux_android_restorecon(const char *file, unsigned int flags) +{ + return selinux_android_restorecon_common(file, NULL, -1, flags); +} + +int selinux_android_restorecon_pkgdir(const char *pkgdir, + const char *seinfo, + uid_t uid, + unsigned int flags) +{ + return selinux_android_restorecon_common(pkgdir, seinfo, uid, flags | SELINUX_ANDROID_RESTORECON_DATADATA); +} + +struct selabel_handle* selinux_android_file_context_handle(void) +{ + struct selabel_handle *sehandle; + + set_policy_index(); + sehandle = selabel_open(SELABEL_CTX_FILE, &seopts[policy_index], 1); + + if (!sehandle) { + selinux_log(SELINUX_ERROR, "%s: Error getting file context handle (%s)\n", + __FUNCTION__, strerror(errno)); + return NULL; + } + if (!compute_contexts_hash(seopts, fc_digest)) { + selabel_close(sehandle); + return NULL; + } + selinux_log(SELINUX_INFO, "SELinux: Loaded file_contexts contexts from %s.\n", + seopts[policy_index].value); + + return sehandle; +} + +struct selabel_handle* selinux_android_prop_context_handle(void) +{ + struct selabel_handle* sehandle; + + set_policy_index(); + sehandle = selabel_open(SELABEL_CTX_ANDROID_PROP, + &seopts_prop[policy_index], 1); + if (!sehandle) { + selinux_log(SELINUX_ERROR, "%s: Error getting property context handle (%s)\n", + __FUNCTION__, strerror(errno)); + return NULL; + } + selinux_log(SELINUX_INFO, "SELinux: Loaded property_contexts from %s.\n", + seopts_prop[policy_index].value); + + return sehandle; +} + +struct selabel_handle* selinux_android_service_context_handle(void) +{ + struct selabel_handle* sehandle; + + set_policy_index(); + sehandle = selabel_open(SELABEL_CTX_ANDROID_PROP, + &seopts_service[policy_index], 1); + + if (!sehandle) { + selinux_log(SELINUX_ERROR, "%s: Error getting service context handle (%s)\n", + __FUNCTION__, strerror(errno)); + return NULL; + } + selinux_log(SELINUX_INFO, "SELinux: Loaded service_contexts from %s.\n", + seopts_service[policy_index].value); + + return sehandle; +} + +void selinux_android_set_sehandle(const struct selabel_handle *hndl) +{ + fc_sehandle = (struct selabel_handle *) hndl; +} + +static int selinux_android_load_policy_helper(bool reload) +{ + int fd = -1, rc; + struct stat sb; + void *map = NULL; + int old_policy_index = policy_index; + + /* + * If reloading policy and there is no /data policy or + * that /data policy has the wrong version and our prior + * load was from the / policy, then just return. + * There is no point in reloading policy from / a second time. + */ + set_policy_index(); + if (reload && !policy_index && !old_policy_index) + return 0; + + fd = open(sepolicy_file[policy_index], O_RDONLY | O_NOFOLLOW); + if (fd < 0) { + selinux_log(SELINUX_ERROR, "SELinux: Could not open sepolicy: %s\n", + strerror(errno)); + return -1; + } + if (fstat(fd, &sb) < 0) { + selinux_log(SELINUX_ERROR, "SELinux: Could not stat %s: %s\n", + sepolicy_file[policy_index], strerror(errno)); + close(fd); + return -1; + } + map = mmap(NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0); + if (map == MAP_FAILED) { + selinux_log(SELINUX_ERROR, "SELinux: Could not map %s: %s\n", + sepolicy_file[policy_index], strerror(errno)); + close(fd); + return -1; + } + + rc = security_load_policy(map, sb.st_size); + if (rc < 0) { + selinux_log(SELINUX_ERROR, "SELinux: Could not load policy: %s\n", + strerror(errno)); + munmap(map, sb.st_size); + close(fd); + return -1; + } + + munmap(map, sb.st_size); + close(fd); + selinux_log(SELINUX_INFO, "SELinux: Loaded policy from %s\n", sepolicy_file[policy_index]); + + return 0; +} + +int selinux_android_reload_policy(void) +{ + return selinux_android_load_policy_helper(true); +} + +int selinux_android_load_policy(void) +{ + const char *mnt = SELINUXMNT; + int rc; + rc = mount(SELINUXFS, mnt, SELINUXFS, 0, NULL); + if (rc < 0) { + if (errno == ENODEV) { + /* SELinux not enabled in kernel */ + return -1; + } + if (errno == ENOENT) { + /* Fall back to legacy mountpoint. */ + mnt = OLDSELINUXMNT; + rc = mkdir(mnt, 0755); + if (rc == -1 && errno != EEXIST) { + selinux_log(SELINUX_ERROR,"SELinux: Could not mkdir: %s\n", + strerror(errno)); + return -1; + } + rc = mount(SELINUXFS, mnt, SELINUXFS, 0, NULL); + } + } + if (rc < 0) { + selinux_log(SELINUX_ERROR,"SELinux: Could not mount selinuxfs: %s\n", + strerror(errno)); + return -1; + } + set_selinuxmnt(mnt); + + return selinux_android_load_policy_helper(false); +} + +int selinux_log_callback(int type, const char *fmt, ...) +{ + va_list ap; + int priority; + char *strp; + + switch(type) { + case SELINUX_WARNING: + priority = ANDROID_LOG_WARN; + break; + case SELINUX_INFO: + priority = ANDROID_LOG_INFO; + break; + default: + priority = ANDROID_LOG_ERROR; + break; + } + + va_start(ap, fmt); + if (vasprintf(&strp, fmt, ap) != -1) { + LOG_PRI(priority, "SELinux", "%s", strp); + LOG_EVENT_STRING(AUDITD_LOG_TAG, strp); + free(strp); + } + va_end(ap); + return 0; +} diff --git a/libselinux/src/avc.c b/libselinux/src/avc.c index b1ec57f..5494269 100644 --- a/libselinux/src/avc.c +++ b/libselinux/src/avc.c @@ -67,6 +67,46 @@ static inline int avc_hash(security_id_t ssid, & (AVC_CACHE_SLOTS - 1); } +#ifdef ANDROID +int avc_context_to_sid(const char * ctx, security_id_t * sid) +{ + int rc; + /* avc_init needs to be called before this function */ + assert(avc_running); + + avc_get_lock(avc_lock); + rc = sidtab_context_to_sid(&avc_sidtab, ctx, sid); + avc_release_lock(avc_lock); + return rc; +} + +int avc_sid_to_context(security_id_t sid, char ** ctx) +{ + int rc; + *ctx = NULL; + avc_get_lock(avc_lock); + *ctx = strdup(sid->ctx); /* caller must free via freecon */ + rc = *ctx ? 0 : -1; + avc_release_lock(avc_lock); + return rc; +} + +int avc_get_initial_sid(const char * name, security_id_t * sid) +{ + int rc; + char * con; + + rc = security_get_initial_context(name, &con); + if (rc < 0) + return rc; + rc = avc_context_to_sid(con, sid); + + freecon(con); + + return rc; +} + +#else int avc_context_to_sid_raw(const char * ctx, security_id_t * sid) { int rc; @@ -144,6 +184,7 @@ int avc_get_initial_sid(const char * name, security_id_t * sid) return rc; } +#endif /* ANDROID */ int avc_open(struct selinux_opt *opts, unsigned nopts) { @@ -785,9 +826,15 @@ int avc_has_perm_noaudit(security_id_t ssid, avc_cache_stats_incr(entry_misses); rc = avc_lookup(ssid, tsid, tclass, requested, aeref); if (rc) { +#ifdef ANDROID + rc = security_compute_av(ssid->ctx, tsid->ctx, + tclass, requested, + &entry.avd); +#else rc = security_compute_av_flags_raw(ssid->ctx, tsid->ctx, tclass, requested, &entry.avd); +#endif if (rc && errno == EINVAL && !avc_enforcing) { rc = errno = 0; goto out; @@ -854,8 +901,13 @@ int avc_compute_create(security_id_t ssid, security_id_t tsid, rc = avc_lookup(ssid, tsid, tclass, 0, &aeref); if (rc) { /* need to make a cache entry for this tuple */ +#ifdef ANDROID + rc = security_compute_av(ssid->ctx, tsid->ctx, + tclass, 0, &entry.avd); +#else rc = security_compute_av_flags_raw(ssid->ctx, tsid->ctx, tclass, 0, &entry.avd); +#endif if (rc) goto out; rc = avc_insert(ssid, tsid, tclass, &entry, &aeref); @@ -866,8 +918,13 @@ int avc_compute_create(security_id_t ssid, security_id_t tsid, /* check for a saved compute_create value */ if (!aeref.ae->create_sid) { /* need to query the kernel policy */ +#ifdef ANDROID + rc = security_compute_create(ssid->ctx, tsid->ctx, tclass, + &ctx); +#else rc = security_compute_create_raw(ssid->ctx, tsid->ctx, tclass, &ctx); +#endif if (rc) goto out; rc = sidtab_context_to_sid(&avc_sidtab, ctx, newsid); @@ -887,6 +944,7 @@ out: return rc; } +#ifndef ANDROID int avc_compute_member(security_id_t ssid, security_id_t tsid, security_class_t tclass, security_id_t *newsid) { @@ -906,6 +964,7 @@ out: avc_release_lock(avc_lock); return rc; } +#endif int avc_add_callback(int (*callback) (uint32_t event, security_id_t ssid, security_id_t tsid, diff --git a/libselinux/src/avc_internal.h b/libselinux/src/avc_internal.h index f851659..37aa196 100644 --- a/libselinux/src/avc_internal.h +++ b/libselinux/src/avc_internal.h @@ -20,7 +20,11 @@ extern void *(*avc_func_malloc) (size_t) hidden; extern void (*avc_func_free) (void *)hidden; +#ifdef ANDROID +extern void (*avc_func_log) (const char *, ...)hidden; +#else extern void (*avc_func_log) (const char *, ...) __attribute__((__format__(printf,1,2))) hidden; +#endif extern void (*avc_func_audit) (void *, security_class_t, char *, size_t)hidden; extern int avc_using_threads hidden; diff --git a/libselinux/src/booleans.c b/libselinux/src/booleans.c index 4b39a28..067964c 100644 --- a/libselinux/src/booleans.c +++ b/libselinux/src/booleans.c @@ -63,7 +63,11 @@ int security_get_boolean_names(char ***names, int *len) } for (i = 0; i < *len; i++) { +#ifdef ANDROID + n[i] = strdup(namelist[i]->d_name); +#else n[i] = (char *)malloc(_D_ALLOC_NAMLEN(namelist[i])); +#endif if (!n[i]) { rc = -1; goto bad_freen; @@ -88,6 +92,7 @@ int security_get_boolean_names(char ***names, int *len) hidden_def(security_get_boolean_names) +#ifndef ANDROID char *selinux_boolean_sub(const char *name) { char *sub = NULL; @@ -195,6 +200,7 @@ out: return fd; } +#endif /* NOT an ANDROID build */ #define STRBUF_SIZE 3 static int get_bool_value(const char *name, char **buf) @@ -212,8 +218,11 @@ static int get_bool_value(const char *name, char **buf) return -1; (*buf)[STRBUF_SIZE] = 0; - +#ifdef ANDROID + fd = open(name, O_RDONLY); +#else fd = bool_open(name, O_RDONLY); +#endif if (fd < 0) goto out_err; @@ -278,8 +287,11 @@ int security_set_boolean(const char *name, int value) errno = EINVAL; return -1; } - +#ifdef ANDROID + fd = open(name, O_WRONLY); +#else fd = bool_open(name, O_WRONLY); +#endif if (fd < 0) return -1; @@ -330,6 +342,7 @@ int security_commit_booleans(void) hidden_def(security_commit_booleans) +#ifndef ANDROID static char *strtrim(char *dest, char *source, int size) { int i = 0; @@ -486,6 +499,8 @@ static int save_booleans(size_t boolcnt, SELboolean * boollist) free(used); return 0; } +#endif /* Not ANDROID build */ + static void rollback(SELboolean * boollist, int end) { int i; @@ -496,8 +511,13 @@ static void rollback(SELboolean * boollist, int end) name)); } +#ifdef ANDROID +int security_set_boolean_list(size_t boolcnt, SELboolean * const boollist, + int permanent __attribute__((unused))) +#else int security_set_boolean_list(size_t boolcnt, SELboolean * boollist, int permanent) +#endif { size_t i; @@ -512,12 +532,14 @@ int security_set_boolean_list(size_t boolcnt, SELboolean * boollist, if (security_commit_booleans()) { return -1; } - +#ifndef ANDROID if (permanent) return save_booleans(boolcnt, boollist); - +#endif return 0; } + +#ifndef ANDROID int security_load_booleans(char *path) { FILE *boolf; @@ -568,3 +590,4 @@ int security_load_booleans(char *path) errno = EINVAL; return errors ? -1 : 0; } +#endif /* Not ANDROID build */ diff --git a/libselinux/src/canonicalize_context.c b/libselinux/src/canonicalize_context.c index 7cf3139..bcfb496 100644 --- a/libselinux/src/canonicalize_context.c +++ b/libselinux/src/canonicalize_context.c @@ -9,8 +9,13 @@ #include "policy.h" #include <limits.h> +#ifdef ANDROID +int security_canonicalize_context(const char * con, + char ** canoncon) +#else int security_canonicalize_context_raw(const char * con, char ** canoncon) +#endif { char path[PATH_MAX]; char *buf; @@ -59,7 +64,7 @@ int security_canonicalize_context_raw(const char * con, close(fd); return ret; } - +#ifndef ANDROID hidden_def(security_canonicalize_context_raw) int security_canonicalize_context(const char * con, @@ -84,3 +89,4 @@ int security_canonicalize_context(const char * con, } hidden_def(security_canonicalize_context) +#endif diff --git a/libselinux/src/checkAccess.c b/libselinux/src/checkAccess.c index 29be16e..abac61f 100644 --- a/libselinux/src/checkAccess.c +++ b/libselinux/src/checkAccess.c @@ -60,6 +60,7 @@ int selinux_check_access(const char *scon, const char *tcon, const char *class, return avc_has_perm (scon_id, tcon_id, sclass, av, NULL, aux); } +#ifndef ANDROID int selinux_check_passwd_access(access_vector_t requested) { int status = -1; @@ -99,3 +100,4 @@ int checkPasswdAccess(access_vector_t requested) { return selinux_check_passwd_access(requested); } +#endif diff --git a/libselinux/src/check_context.c b/libselinux/src/check_context.c index 52063fa..1055e04 100644 --- a/libselinux/src/check_context.c +++ b/libselinux/src/check_context.c @@ -9,7 +9,11 @@ #include "policy.h" #include <limits.h> +#ifdef ANDROID +int security_check_context(const char * con) +#else int security_check_context_raw(const char * con) +#endif { char path[PATH_MAX]; int fd, ret; @@ -30,7 +34,7 @@ int security_check_context_raw(const char * con) return -1; return 0; } - +#ifndef ANDROID hidden_def(security_check_context_raw) int security_check_context(const char * con) @@ -49,3 +53,4 @@ int security_check_context(const char * con) } hidden_def(security_check_context) +#endif diff --git a/libselinux/src/compute_av.c b/libselinux/src/compute_av.c index 937e5c3..554e981 100644 --- a/libselinux/src/compute_av.c +++ b/libselinux/src/compute_av.c @@ -10,11 +10,19 @@ #include "policy.h" #include "mapping.h" +#ifdef ANDROID +int security_compute_av(const char * scon, + const char * tcon, + security_class_t tclass, + access_vector_t requested, + struct av_decision *avd) +#else int security_compute_av_flags_raw(const char * scon, const char * tcon, security_class_t tclass, access_vector_t requested, struct av_decision *avd) +#endif { char path[PATH_MAX]; char *buf; @@ -71,7 +79,7 @@ int security_compute_av_flags_raw(const char * scon, close(fd); return ret; } - +#ifndef ANDROID hidden_def(security_compute_av_flags_raw) int security_compute_av_raw(const char * scon, @@ -155,3 +163,4 @@ int security_compute_av(const char * scon, } hidden_def(security_compute_av) +#endif /* Not an ANDROID build */ diff --git a/libselinux/src/compute_create.c b/libselinux/src/compute_create.c index 9559d42..1d7e642 100644 --- a/libselinux/src/compute_create.c +++ b/libselinux/src/compute_create.c @@ -11,6 +11,7 @@ #include "policy.h" #include "mapping.h" +#ifndef ANDROID static int object_name_encode(const char *objname, char *buffer, size_t buflen) { int code; @@ -47,12 +48,21 @@ static int object_name_encode(const char *objname, char *buffer, size_t buflen) return 0; } +#endif /* Not an ANDROID build */ +#ifdef ANDROID +int security_compute_create_name_raw(const char * scon, + const char * tcon, + security_class_t tclass, + const char *objname __attribute__((unused)), + char ** newcon) +#else int security_compute_create_name_raw(const char * scon, const char * tcon, security_class_t tclass, const char *objname, char ** newcon) +#endif { char path[PATH_MAX]; char *buf; @@ -77,13 +87,14 @@ int security_compute_create_name_raw(const char * scon, } len = snprintf(buf, size, "%s %s %hu", scon, tcon, unmap_class(tclass)); +#ifndef ANDROID if (objname && object_name_encode(objname, buf + len, size - len) < 0) { errno = ENAMETOOLONG; ret = -1; goto out2; } - +#endif ret = write(fd, buf, strlen(buf)); if (ret < 0) goto out2; @@ -107,6 +118,7 @@ int security_compute_create_name_raw(const char * scon, } hidden_def(security_compute_create_name_raw) +#ifndef ANDROID int security_compute_create_raw(const char * scon, const char * tcon, security_class_t tclass, @@ -147,12 +159,17 @@ int security_compute_create_name(const char * scon, return ret; } hidden_def(security_compute_create_name) +#endif /* Not an ANDROID build */ int security_compute_create(const char * scon, const char * tcon, security_class_t tclass, char ** newcon) { +#ifdef ANDROID + return security_compute_create_name_raw(scon, tcon, tclass, NULL, newcon); +#else return security_compute_create_name(scon, tcon, tclass, NULL, newcon); +#endif } hidden_def(security_compute_create) diff --git a/libselinux/src/fgetfilecon.c b/libselinux/src/fgetfilecon.c index 3954e64..21b49fc 100644 --- a/libselinux/src/fgetfilecon.c +++ b/libselinux/src/fgetfilecon.c @@ -7,7 +7,11 @@ #include "selinux_internal.h" #include "policy.h" +#ifdef ANDROID +int fgetfilecon(int fd, char ** context) +#else int fgetfilecon_raw(int fd, char ** context) +#endif { char *buf; ssize_t size; @@ -48,7 +52,7 @@ int fgetfilecon_raw(int fd, char ** context) *context = buf; return ret; } - +#ifndef ANDROID hidden_def(fgetfilecon_raw) int fgetfilecon(int fd, char ** context) @@ -70,3 +74,4 @@ int fgetfilecon(int fd, char ** context) return ret; } +#endif diff --git a/libselinux/src/fsetfilecon.c b/libselinux/src/fsetfilecon.c index 52707d0..159b93b 100644 --- a/libselinux/src/fsetfilecon.c +++ b/libselinux/src/fsetfilecon.c @@ -7,6 +7,13 @@ #include "selinux_internal.h" #include "policy.h" +#ifdef ANDROID +int fsetfilecon(int fd, const char *context) +{ + return fsetxattr(fd, XATTR_NAME_SELINUX, context, strlen(context) + 1, + 0); +} +#else int fsetfilecon_raw(int fd, const char * context) { int rc = fsetxattr(fd, XATTR_NAME_SELINUX, context, strlen(context) + 1, @@ -41,3 +48,4 @@ int fsetfilecon(int fd, const char *context) return ret; } +#endif diff --git a/libselinux/src/get_initial_context.c b/libselinux/src/get_initial_context.c index 522ed78..a269f7c 100644 --- a/libselinux/src/get_initial_context.c +++ b/libselinux/src/get_initial_context.c @@ -11,7 +11,11 @@ #define SELINUX_INITCON_DIR "/initial_contexts/" +#ifdef ANDROID +int security_get_initial_context(const char * name, char ** con) +#else int security_get_initial_context_raw(const char * name, char ** con) +#endif { char path[PATH_MAX]; char *buf; @@ -52,7 +56,7 @@ int security_get_initial_context_raw(const char * name, char ** con) close(fd); return ret; } - +#ifndef ANDROID hidden_def(security_get_initial_context_raw) int security_get_initial_context(const char * name, char ** con) @@ -70,3 +74,4 @@ int security_get_initial_context(const char * name, char ** con) } hidden_def(security_get_initial_context) +#endif diff --git a/libselinux/src/getfilecon.c b/libselinux/src/getfilecon.c index 5d4d483..06a4301 100644 --- a/libselinux/src/getfilecon.c +++ b/libselinux/src/getfilecon.c @@ -7,7 +7,11 @@ #include <sys/xattr.h> #include "policy.h" +#ifdef ANDROID +int getfilecon(const char *path, char ** context) +#else int getfilecon_raw(const char *path, char ** context) +#endif { char *buf; ssize_t size; @@ -48,7 +52,7 @@ int getfilecon_raw(const char *path, char ** context) *context = buf; return ret; } - +#ifndef ANDROID hidden_def(getfilecon_raw) int getfilecon(const char *path, char ** context) @@ -71,3 +75,4 @@ int getfilecon(const char *path, char ** context) } hidden_def(getfilecon) +#endif diff --git a/libselinux/src/getpeercon.c b/libselinux/src/getpeercon.c index 3a77a2d..c4d87bd 100644 --- a/libselinux/src/getpeercon.c +++ b/libselinux/src/getpeercon.c @@ -11,7 +11,11 @@ #define SO_PEERSEC 31 #endif +#ifdef ANDROID +int getpeercon(int fd, char ** context) +#else int getpeercon_raw(int fd, char ** context) +#endif { char *buf; socklen_t size; @@ -42,7 +46,7 @@ int getpeercon_raw(int fd, char ** context) *context = buf; return ret; } - +#ifndef ANDROID hidden_def(getpeercon_raw) int getpeercon(int fd, char ** context) @@ -59,3 +63,4 @@ int getpeercon(int fd, char ** context) return ret; } +#endif diff --git a/libselinux/src/init.c b/libselinux/src/init.c index 179e0d0..f4ee637 100644 --- a/libselinux/src/init.c +++ b/libselinux/src/init.c @@ -7,8 +7,15 @@ #include <stdio.h> #include <stdio_ext.h> #include <dlfcn.h> + +#ifdef DARWIN +#include <sys/param.h> +#include <sys/mount.h> +#else #include <sys/statvfs.h> #include <sys/vfs.h> +#endif + #include <stdint.h> #include <limits.h> #include <sys/mount.h> @@ -16,11 +23,13 @@ #include "dso.h" #include "policy.h" #include "selinux_internal.h" + +#ifndef ANDROID #include "setrans_internal.h" +#endif char *selinux_mnt = NULL; int selinux_page_size = 0; -int obj_class_compat = 1; /* Verify the mount point for selinux file system has a selinuxfs. If the file system: diff --git a/libselinux/src/label.c b/libselinux/src/label.c index c3c099e..19bcb04 100644 --- a/libselinux/src/label.c +++ b/libselinux/src/label.c @@ -21,12 +21,20 @@ typedef int (*selabel_initfunc)(struct selabel_handle *rec, static selabel_initfunc initfuncs[] = { &selabel_file_init, +#ifdef ANDROID + NULL, + NULL, + NULL, + &selabel_property_init +#else &selabel_media_init, &selabel_x_init, &selabel_db_init, - &selabel_property_init, + NULL +#endif }; +#ifndef ANDROID static void selabel_subs_fini(struct selabel_sub *ptr) { struct selabel_sub *next; @@ -123,6 +131,7 @@ err: free(sub); goto out; } +#endif /* * Validation functions @@ -175,10 +184,10 @@ struct selabel_handle *selabel_open(unsigned int backend, memset(rec, 0, sizeof(*rec)); rec->backend = backend; rec->validating = selabel_is_validate_set(opts, nopts); - +#ifndef ANDROID rec->subs = NULL; rec->dist_subs = NULL; - +#endif if ((*initfuncs[backend])(rec, opts, nopts)) { free(rec); rec = NULL; @@ -188,6 +197,32 @@ out: return rec; } +#ifdef ANDROID +static struct selabel_lookup_rec *selabel_lookup_common + (struct selabel_handle *rec, + const char *key, int type) +{ + struct selabel_lookup_rec *lr; + lr = rec->func_lookup(rec, key, type); + if (!lr) + return NULL; + + return lr; +} + +int selabel_lookup(struct selabel_handle *rec, char **con, + const char *key, int type) +{ + struct selabel_lookup_rec *lr; + + lr = selabel_lookup_common(rec, key, type); + if (!lr) + return -1; + + *con = strdup(lr->ctx_raw); + return *con ? 0 : -1; +} +#else static struct selabel_lookup_rec * selabel_lookup_common(struct selabel_handle *rec, int translating, const char *key, int type) @@ -242,7 +277,9 @@ int selabel_lookup(struct selabel_handle *rec, char **con, *con = strdup(lr->ctx_trans); return *con ? 0 : -1; } +#endif +#ifndef ANDROID int selabel_lookup_raw(struct selabel_handle *rec, char **con, const char *key, int type) { @@ -255,14 +292,52 @@ int selabel_lookup_raw(struct selabel_handle *rec, char **con, *con = strdup(lr->ctx_raw); return *con ? 0 : -1; } +#endif + +#ifdef ANDROID +bool selabel_partial_match(struct selabel_handle *rec, const char *key) +{ + if (!rec->func_partial_match) { + /* + * If the label backend does not support partial matching, + * then assume a match is possible. + */ + return true; + } + return rec->func_partial_match(rec, key); +} + +int selabel_lookup_best_match(struct selabel_handle *rec, char **con, + const char *key, const char **aliases, int type) +{ + struct selabel_lookup_rec *lr; + + if (!rec->func_lookup_best_match) { + errno = ENOTSUP; + return -1; + } + + lr = rec->func_lookup_best_match(rec, key, aliases, type); + if (!lr) + return -1; + + *con = strdup(lr->ctx_raw); + return *con ? 0 : -1; +} +#endif void selabel_close(struct selabel_handle *rec) { +#ifdef ANDROID + rec->func_close(rec); + free(rec); +#else selabel_subs_fini(rec->subs); selabel_subs_fini(rec->dist_subs); rec->func_close(rec); free(rec->spec_file); free(rec); +#endif } void selabel_stats(struct selabel_handle *rec) diff --git a/libselinux/src/label_android_file.c b/libselinux/src/label_android_file.c new file mode 100644 index 0000000..3708413 --- /dev/null +++ b/libselinux/src/label_android_file.c @@ -0,0 +1,776 @@ +/* + * File contexts backend for labeling system + * + * Author : Eamon Walsh <ewalsh@xxxxxxxxxxxxx> + */ + +#include <fcntl.h> +#include <stdarg.h> +#include <string.h> +#include <stdio.h> +#include <ctype.h> +#include <errno.h> +#include <limits.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <unistd.h> +#include "callbacks.h" +#include "label_internal.h" +#include <pcre.h> + +/* + * Internals, mostly moved over from matchpathcon.c + */ + +/* A file security context specification. */ +typedef struct spec { + struct selabel_lookup_rec lr; /* holds contexts for lookup result */ + char *regex_str; /* regular expession string for diagnostics */ + char *type_str; /* type string for diagnostic messages */ + pcre *regex; /* compiled regular expression */ + pcre_extra *sd; /* pcre study result */ + char regcomp; /* regex_str has been compiled to regex */ + mode_t mode; /* mode format value */ + int matches; /* number of matching pathnames */ + int hasMetaChars; /* regular expression has meta-chars */ + int stem_id; /* indicates which stem-compression item */ + size_t prefix_len; /* length of fixed path prefix */ +} spec_t; + +/* A regular expression stem */ +typedef struct stem { + char *buf; + int len; +} stem_t; + +/* Our stored configuration */ +struct saved_data { + /* + * The array of specifications, initially in the same order as in + * the specification file. Sorting occurs based on hasMetaChars. + */ + spec_t *spec_arr; + unsigned int nspec; + unsigned int ncomp; + + /* + * The array of regular expression stems. + */ + stem_t *stem_arr; + int num_stems; + int alloc_stems; +}; + +/* Return the length of the text that can be considered the stem, returns 0 + * if there is no identifiable stem */ +static int get_stem_from_spec(const char *const buf) +{ + const char *tmp = strchr(buf + 1, '/'); + const char *ind; + + if (!tmp) + return 0; + + for (ind = buf; ind < tmp; ind++) { + if (strchr(".^$?*+|[({", (int)*ind)) + return 0; + } + return tmp - buf; +} + +/* return the length of the text that is the stem of a file name */ +static int get_stem_from_file_name(const char *const buf) +{ + const char *tmp = strchr(buf + 1, '/'); + + if (!tmp) + return 0; + return tmp - buf; +} + +/* find the stem of a file spec, returns the index into stem_arr for a new + * or existing stem, (or -1 if there is no possible stem - IE for a file in + * the root directory or a regex that is too complex for us). */ +static int find_stem_from_spec(struct saved_data *data, const char *buf) +{ + int i, num = data->num_stems; + int stem_len = get_stem_from_spec(buf); + + if (!stem_len) + return -1; + for (i = 0; i < num; i++) { + if (stem_len == data->stem_arr[i].len + && !strncmp(buf, data->stem_arr[i].buf, stem_len)) + return i; + } + if (data->alloc_stems == num) { + stem_t *tmp_arr; + data->alloc_stems = data->alloc_stems * 2 + 16; + tmp_arr = (stem_t *) realloc(data->stem_arr, + sizeof(stem_t) * data->alloc_stems); + if (!tmp_arr) + return -1; + data->stem_arr = tmp_arr; + } + data->stem_arr[num].len = stem_len; + data->stem_arr[num].buf = (char *) malloc(stem_len + 1); + if (!data->stem_arr[num].buf) + return -1; + memcpy(data->stem_arr[num].buf, buf, stem_len); + data->stem_arr[num].buf[stem_len] = '\0'; + data->num_stems++; + buf += stem_len; + return num; +} + +/* find the stem of a file name, returns the index into stem_arr (or -1 if + * there is no match - IE for a file in the root directory or a regex that is + * too complex for us). Makes buf point to the text AFTER the stem. */ +static int find_stem_from_file(struct saved_data *data, const char **buf) +{ + int i; + int stem_len = get_stem_from_file_name(*buf); + + if (!stem_len) + return -1; + for (i = 0; i < data->num_stems; i++) { + if (stem_len == data->stem_arr[i].len + && !strncmp(*buf, data->stem_arr[i].buf, stem_len)) { + *buf += stem_len; + return i; + } + } + return -1; +} + +/* + * Warn about duplicate specifications. + */ +static int nodups_specs(struct saved_data *data, const char *path) +{ + int rc = 0; + unsigned int ii, jj; + struct spec *curr_spec, *spec_arr = data->spec_arr; + + for (ii = 0; ii < data->nspec; ii++) { + curr_spec = &spec_arr[ii]; + for (jj = ii + 1; jj < data->nspec; jj++) { + if ((!strcmp + (spec_arr[jj].regex_str, curr_spec->regex_str)) + && (!spec_arr[jj].mode || !curr_spec->mode + || spec_arr[jj].mode == curr_spec->mode)) { + rc = -1; + errno = EINVAL; + if (strcmp + (spec_arr[jj].lr.ctx_raw, + curr_spec->lr.ctx_raw)) { + selinux_log + (SELINUX_ERROR, + "%s: Multiple different specifications for %s (%s and %s).\n", + path, curr_spec->regex_str, + spec_arr[jj].lr.ctx_raw, + curr_spec->lr.ctx_raw); + } else { + selinux_log + (SELINUX_ERROR, + "%s: Multiple same specifications for %s.\n", + path, curr_spec->regex_str); + } + } + } + } + return rc; +} + +/* Determine if the regular expression specification has any meta characters. */ +static void spec_hasMetaChars(struct spec *spec) +{ + char *c; + size_t len; + char *end; + + c = spec->regex_str; + len = strlen(spec->regex_str); + end = c + len; + + spec->hasMetaChars = 0; + spec->prefix_len = len; + + /* Look at each character in the RE specification string for a + * meta character. Return when any meta character reached. */ + while (c != end) { + switch (*c) { + case '.': + case '^': + case '$': + case '?': + case '*': + case '+': + case '|': + case '[': + case '(': + case '{': + spec->hasMetaChars = 1; + spec->prefix_len = c - spec->regex_str; + return; + case '\\': /* skip the next character */ + c++; + break; + default: + break; + + } + c++; + } + return; +} + +static int compile_regex(struct saved_data *data, spec_t *spec, const char **errbuf) +{ + const char *tmperrbuf; + char *reg_buf, *anchored_regex, *cp; + stem_t *stem_arr = data->stem_arr; + size_t len; + int erroff; + + if (spec->regcomp) + return 0; /* already done */ + + data->ncomp++; /* how many compiled regexes required */ + + /* Skip the fixed stem. */ + reg_buf = spec->regex_str; + if (spec->stem_id >= 0) + reg_buf += stem_arr[spec->stem_id].len; + + /* Anchor the regular expression. */ + len = strlen(reg_buf); + cp = anchored_regex = (char *) malloc(len + 3); + if (!anchored_regex) + return -1; + /* Create ^...$ regexp. */ + *cp++ = '^'; + memcpy(cp, reg_buf, len); + cp += len; + *cp++ = '$'; + *cp = '\0'; + + /* Compile the regular expression. */ + spec->regex = pcre_compile(anchored_regex, PCRE_DOTALL, &tmperrbuf, &erroff, NULL); + free(anchored_regex); + if (!spec->regex) { + if (errbuf) + *errbuf=tmperrbuf; + return -1; + } + + spec->sd = pcre_study(spec->regex, 0, &tmperrbuf); + if (!spec->sd && tmperrbuf) { + if (errbuf) + *errbuf=tmperrbuf; + return -1; + } + + /* Done. */ + spec->regcomp = 1; + + return 0; +} + + +static int process_line(struct selabel_handle *rec, + const char *path, const char *prefix, + char *line_buf, int pass, unsigned lineno) +{ + int items, len; + char buf1[BUFSIZ], buf2[BUFSIZ], buf3[BUFSIZ]; + char *buf_p, *regex = buf1, *type = buf2, *context = buf3; + struct saved_data *data = (struct saved_data *)rec->data; + spec_t *spec_arr = data->spec_arr; + unsigned int nspec = data->nspec; + + len = strlen(line_buf); + if (line_buf[len - 1] == '\n') + line_buf[len - 1] = 0; + buf_p = line_buf; + while (isspace(*buf_p)) + buf_p++; + /* Skip comment lines and empty lines. */ + if (*buf_p == '#' || *buf_p == 0) + return 0; + items = sscanf(line_buf, "%255s %255s %255s", regex, type, context); + if (items < 2) { + selinux_log(SELINUX_WARNING, + "%s: line %d is missing fields, skipping\n", path, + lineno); + return 0; + } else if (items == 2) { + /* The type field is optional. */ + context = type; + type = NULL; + } + + len = get_stem_from_spec(regex); + if (len && prefix && strncmp(prefix, regex, len)) { + /* Stem of regex does not match requested prefix, discard. */ + return 0; + } + + if (pass == 1) { + /* On the second pass, process and store the specification in spec. */ + const char *errbuf = NULL; + spec_arr[nspec].stem_id = find_stem_from_spec(data, regex); + spec_arr[nspec].regex_str = strdup(regex); + if (!spec_arr[nspec].regex_str) { + selinux_log(SELINUX_WARNING, + "%s: out of memory at line %d on regex %s\n", + path, lineno, regex); + return -1; + + } + if (rec->validating && compile_regex(data, &spec_arr[nspec], &errbuf)) { + selinux_log(SELINUX_WARNING, + "%s: line %d has invalid regex %s: %s\n", + path, lineno, regex, + (errbuf ? errbuf : "out of memory")); + } + + /* Convert the type string to a mode format */ + spec_arr[nspec].mode = 0; + if (!type) + goto skip_type; + spec_arr[nspec].type_str = strdup(type); + len = strlen(type); + if (type[0] != '-' || len != 2) { + selinux_log(SELINUX_WARNING, + "%s: line %d has invalid file type %s\n", + path, lineno, type); + return 0; + } + switch (type[1]) { + case 'b': + spec_arr[nspec].mode = S_IFBLK; + break; + case 'c': + spec_arr[nspec].mode = S_IFCHR; + break; + case 'd': + spec_arr[nspec].mode = S_IFDIR; + break; + case 'p': + spec_arr[nspec].mode = S_IFIFO; + break; + case 'l': + spec_arr[nspec].mode = S_IFLNK; + break; + case 's': + spec_arr[nspec].mode = S_IFSOCK; + break; + case '-': + spec_arr[nspec].mode = S_IFREG; + break; + default: + selinux_log(SELINUX_WARNING, + "%s: line %d has invalid file type %s\n", + path, lineno, type); + return 0; + } + + skip_type: + spec_arr[nspec].lr.ctx_raw = strdup(context); + + if (strcmp(context, "<<none>>") && rec->validating) { + if (selabel_validate(rec, &spec_arr[nspec].lr) < 0) { + selinux_log(SELINUX_WARNING, + "%s: line %d has invalid context %s\n", + path, lineno, spec_arr[nspec].lr.ctx_raw); + } + } + + /* Determine if specification has + * any meta characters in the RE */ + spec_hasMetaChars(&spec_arr[nspec]); + } + + data->nspec = ++nspec; + return 0; +} + +static int init(struct selabel_handle *rec, const struct selinux_opt *opts, + unsigned n) +{ + struct saved_data *data = (struct saved_data *)rec->data; + const char *path = NULL; + const char *prefix = NULL; + FILE *fp; + FILE *localfp = NULL; + FILE *homedirfp = NULL; + char local_path[PATH_MAX + 1]; + char homedir_path[PATH_MAX + 1]; + char line_buf[BUFSIZ]; + unsigned int lineno, pass, i, j, maxnspec; + spec_t *spec_copy = NULL; + int status = -1, baseonly = 0; + struct stat sb; + + /* Process arguments */ + while (n--) + switch(opts[n].type) { + case SELABEL_OPT_PATH: + path = opts[n].value; + break; + case SELABEL_OPT_SUBSET: + prefix = opts[n].value; + break; + case SELABEL_OPT_BASEONLY: + baseonly = !!opts[n].value; + break; + } + + /* Open the specification file. */ + if ((fp = fopen(path, "r")) == NULL) + return -1; + + if (fstat(fileno(fp), &sb) < 0) + return -1; + if (!S_ISREG(sb.st_mode)) { + errno = EINVAL; + return -1; + } + + if (!baseonly) { + snprintf(homedir_path, sizeof(homedir_path), "%s.homedirs", + path); + homedirfp = fopen(homedir_path, "r"); + + snprintf(local_path, sizeof(local_path), "%s.local", path); + localfp = fopen(local_path, "r"); + } + + /* + * Perform two passes over the specification file. + * The first pass counts the number of specifications and + * performs simple validation of the input. At the end + * of the first pass, the spec array is allocated. + * The second pass performs detailed validation of the input + * and fills in the spec array. + */ + maxnspec = UINT_MAX / sizeof(spec_t); + for (pass = 0; pass < 2; pass++) { + lineno = 0; + data->nspec = 0; + data->ncomp = 0; + while (fgets(line_buf, sizeof line_buf - 1, fp) + && data->nspec < maxnspec) { + if (process_line(rec, path, prefix, line_buf, + pass, ++lineno) != 0) + goto finish; + } + if (pass == 1) { + status = nodups_specs(data, path); + if (status) + goto finish; + } + lineno = 0; + if (homedirfp) + while (fgets(line_buf, sizeof line_buf - 1, homedirfp) + && data->nspec < maxnspec) { + if (process_line + (rec, homedir_path, prefix, + line_buf, pass, ++lineno) != 0) + goto finish; + } + + lineno = 0; + if (localfp) + while (fgets(line_buf, sizeof line_buf - 1, localfp) + && data->nspec < maxnspec) { + if (process_line + (rec, local_path, prefix, line_buf, + pass, ++lineno) != 0) + goto finish; + } + + if (pass == 0) { + if (data->nspec == 0) { + status = 0; + goto finish; + } + if (NULL == (data->spec_arr = + (spec_t *) malloc(sizeof(spec_t) * data->nspec))) + goto finish; + memset(data->spec_arr, 0, sizeof(spec_t)*data->nspec); + maxnspec = data->nspec; + rewind(fp); + if (homedirfp) + rewind(homedirfp); + if (localfp) + rewind(localfp); + } + } + + /* Move exact pathname specifications to the end. */ + spec_copy = (spec_t *) malloc(sizeof(spec_t) * data->nspec); + if (!spec_copy) + goto finish; + j = 0; + for (i = 0; i < data->nspec; i++) + if (data->spec_arr[i].hasMetaChars) + memcpy(&spec_copy[j++], + &data->spec_arr[i], sizeof(spec_t)); + for (i = 0; i < data->nspec; i++) + if (!data->spec_arr[i].hasMetaChars) + memcpy(&spec_copy[j++], + &data->spec_arr[i], sizeof(spec_t)); + free(data->spec_arr); + data->spec_arr = spec_copy; + + status = 0; +finish: + fclose(fp); + if (data->spec_arr != spec_copy) + free(data->spec_arr); + if (homedirfp) + fclose(homedirfp); + if (localfp) + fclose(localfp); + return status; +} + +/* + * Backend interface routines + */ +static void closef(struct selabel_handle *rec) +{ + struct saved_data *data = (struct saved_data *)rec->data; + struct spec *spec; + struct stem *stem; + unsigned int i; + + for (i = 0; i < data->nspec; i++) { + spec = &data->spec_arr[i]; + free(spec->regex_str); + free(spec->type_str); + free(spec->lr.ctx_raw); + free(spec->lr.ctx_trans); + if (spec->regcomp) { + pcre_free(spec->regex); + pcre_free_study(spec->sd); + } + } + + for (i = 0; i < (unsigned int)data->num_stems; i++) { + stem = &data->stem_arr[i]; + free(stem->buf); + } + + if (data->spec_arr) + free(data->spec_arr); + if (data->stem_arr) + free(data->stem_arr); + + free(data); +} + +static spec_t *lookup_common(struct selabel_handle *rec, + const char *key, + int type, + bool partial) +{ + struct saved_data *data = (struct saved_data *)rec->data; + spec_t *spec_arr = data->spec_arr; + int i, rc, file_stem, pcre_options = 0; + mode_t mode = (mode_t)type; + const char *buf; + spec_t *ret = NULL; + char *clean_key = NULL; + const char *prev_slash, *next_slash; + unsigned int sofar = 0; + + if (!data->nspec) { + errno = ENOENT; + goto finish; + } + + /* Remove duplicate slashes */ + if ((next_slash = strstr(key, "//"))) { + clean_key = (char *) malloc(strlen(key) + 1); + if (!clean_key) + goto finish; + prev_slash = key; + while (next_slash) { + memcpy(clean_key + sofar, prev_slash, next_slash - prev_slash); + sofar += next_slash - prev_slash; + prev_slash = next_slash + 1; + next_slash = strstr(prev_slash, "//"); + } + strcpy(clean_key + sofar, prev_slash); + key = clean_key; + } + + buf = key; + file_stem = find_stem_from_file(data, &buf); + mode &= S_IFMT; + + if (partial) + pcre_options |= PCRE_PARTIAL_SOFT; + + /* + * Check for matching specifications in reverse order, so that + * the last matching specification is used. + */ + for (i = data->nspec - 1; i >= 0; i--) { + /* if the spec in question matches no stem or has the same + * stem as the file AND if the spec in question has no mode + * specified or if the mode matches the file mode then we do + * a regex check */ + if ((spec_arr[i].stem_id == -1 + || spec_arr[i].stem_id == file_stem) + && (!mode || !spec_arr[i].mode + || mode == spec_arr[i].mode)) { + if (compile_regex(data, &spec_arr[i], NULL) < 0) + goto finish; + if (spec_arr[i].stem_id == -1) + rc = pcre_exec(spec_arr[i].regex, spec_arr[i].sd, key, strlen(key), 0, pcre_options, NULL, 0); + else + rc = pcre_exec(spec_arr[i].regex, spec_arr[i].sd, buf, strlen(buf), 0, pcre_options, NULL, 0); + + if (rc == 0) { + spec_arr[i].matches++; + break; + } else if (partial && rc == PCRE_ERROR_PARTIAL) + break; + + if (rc == PCRE_ERROR_NOMATCH) + continue; + /* else it's an error */ + goto finish; + } + } + + if (i < 0 || strcmp(spec_arr[i].lr.ctx_raw, "<<none>>") == 0) { + /* No matching specification. */ + errno = ENOENT; + goto finish; + } + + ret = &spec_arr[i]; + +finish: + free(clean_key); + return ret; +} + +static struct selabel_lookup_rec *lookup(struct selabel_handle *rec, + const char *key, int type) +{ + spec_t *spec; + spec = lookup_common(rec, key, type, false); + if (spec) + return &spec->lr; + return NULL; +} + +static bool partial_match(struct selabel_handle *rec, const char *key) +{ + return lookup_common(rec, key, 0, true) ? true : false; +} + +static struct selabel_lookup_rec *lookup_best_match(struct selabel_handle *rec, + const char *key, + const char **aliases, + int type) +{ + size_t n, i; + int best = -1; + spec_t **specs; + size_t prefix_len = 0; + struct selabel_lookup_rec *lr = NULL; + + if (!aliases || !aliases[0]) + return lookup(rec, key, type); + + for (n = 0; aliases[n]; n++) + ; + + specs = calloc(n+1, sizeof(spec_t *)); + if (!specs) + return NULL; + specs[0] = lookup_common(rec, key, type, false); + if (specs[0]) { + if (!specs[0]->hasMetaChars) { + /* exact match on key */ + lr = &specs[0]->lr; + goto out; + } + best = 0; + prefix_len = specs[0]->prefix_len; + } + for (i = 1; i <= n; i++) { + specs[i] = lookup_common(rec, aliases[i-1], type, false); + if (specs[i]) { + if (!specs[i]->hasMetaChars) { + /* exact match on alias */ + lr = &specs[i]->lr; + goto out; + } + if (specs[i]->prefix_len > prefix_len) { + best = i; + prefix_len = specs[i]->prefix_len; + } + } + } + + if (best >= 0) { + /* longest fixed prefix match on key or alias */ + lr = &specs[best]->lr; + } + +out: + free(specs); + return lr; +} + +static void stats(struct selabel_handle *rec) +{ + struct saved_data *data = (struct saved_data *)rec->data; + unsigned int i, nspec = data->nspec; + spec_t *spec_arr = data->spec_arr; + + for (i = 0; i < nspec; i++) { + if (spec_arr[i].matches == 0) { + if (spec_arr[i].type_str) { + selinux_log(SELINUX_WARNING, + "Warning! No matches for (%s, %s, %s)\n", + spec_arr[i].regex_str, + spec_arr[i].type_str, + spec_arr[i].lr.ctx_raw); + } else { + selinux_log(SELINUX_WARNING, + "Warning! No matches for (%s, %s)\n", + spec_arr[i].regex_str, + spec_arr[i].lr.ctx_raw); + } + } + } +} + +int selabel_file_init(struct selabel_handle *rec, struct selinux_opt *opts, + unsigned nopts) +{ + struct saved_data *data; + + data = (struct saved_data *)malloc(sizeof(*data)); + if (!data) + return -1; + memset(data, 0, sizeof(*data)); + + rec->data = data; + rec->func_close = &closef; + rec->func_stats = &stats; + rec->func_lookup = &lookup; + rec->func_partial_match = &partial_match; + rec->func_lookup_best_match = &lookup_best_match; + + return init(rec, opts, nopts); +} diff --git a/libselinux/src/label_internal.h b/libselinux/src/label_internal.h index a1fa4fd..c43e48b 100644 --- a/libselinux/src/label_internal.h +++ b/libselinux/src/label_internal.h @@ -57,7 +57,13 @@ struct selabel_handle { const char *key, int type); void (*func_close) (struct selabel_handle *h); void (*func_stats) (struct selabel_handle *h); - +#ifdef ANDROID + bool (*func_partial_match) (struct selabel_handle *h, const char *key); + struct selabel_lookup_rec *(*func_lookup_best_match) (struct selabel_handle *h, + const char *key, + const char **aliases, + int type); +#endif /* supports backend-specific state information */ void *data; @@ -79,6 +85,9 @@ extern int selabel_validate(struct selabel_handle *rec, struct selabel_lookup_rec *contexts) hidden; +#ifdef ANDROID +#define COMPAT_LOG(type, fmt...) selinux_log(type, fmt); +#else /* * Compatibility support */ @@ -95,5 +104,6 @@ extern int compat_validate(struct selabel_handle *rec, struct selabel_lookup_rec *contexts, const char *path, unsigned lineno) hidden; +#endif /* ANDROID */ #endif /* _SELABEL_INTERNAL_H_ */ diff --git a/libselinux/src/lgetfilecon.c b/libselinux/src/lgetfilecon.c index 478e0c6..957d216 100644 --- a/libselinux/src/lgetfilecon.c +++ b/libselinux/src/lgetfilecon.c @@ -7,7 +7,11 @@ #include "selinux_internal.h" #include "policy.h" +#ifdef ANDROID +int lgetfilecon(const char *path, char ** context) +#else int lgetfilecon_raw(const char *path, char ** context) +#endif { char *buf; ssize_t size; @@ -48,7 +52,7 @@ int lgetfilecon_raw(const char *path, char ** context) *context = buf; return ret; } - +#ifndef ANDROID hidden_def(lgetfilecon_raw) int lgetfilecon(const char *path, char ** context) @@ -69,3 +73,4 @@ int lgetfilecon(const char *path, char ** context) return strlen(*context) + 1; return ret; } +#endif diff --git a/libselinux/src/load_policy.c b/libselinux/src/load_policy.c index 21ee58b..b9cf21a 100644 --- a/libselinux/src/load_policy.c +++ b/libselinux/src/load_policy.c @@ -11,8 +11,10 @@ #include <string.h> #include <errno.h> #include "selinux_internal.h" +#ifndef ANDROID #include <sepol/sepol.h> #include <sepol/policydb.h> +#endif #include <dlfcn.h> #include "policy.h" #include <limits.h> @@ -41,6 +43,7 @@ int security_load_policy(void *data, size_t len) hidden_def(security_load_policy) +#ifndef ANDROID int load_setlocaldefs hidden = 1; #undef max @@ -460,3 +463,4 @@ int selinux_init_load_policy(int *enforce) */ return -1; } +#endif /* Not an ANDROID build */ diff --git a/libselinux/src/lsetfilecon.c b/libselinux/src/lsetfilecon.c index 1d3b28a..8e472e7 100644 --- a/libselinux/src/lsetfilecon.c +++ b/libselinux/src/lsetfilecon.c @@ -7,6 +7,13 @@ #include "selinux_internal.h" #include "policy.h" +#ifdef ANDROID +int lsetfilecon(const char *path, const char *context) +{ + return lsetxattr(path, XATTR_NAME_SELINUX, context, strlen(context) + 1, + 0); +} +#else int lsetfilecon_raw(const char *path, const char * context) { int rc = lsetxattr(path, XATTR_NAME_SELINUX, context, strlen(context) + 1, @@ -41,3 +48,4 @@ int lsetfilecon(const char *path, const char *context) return ret; } +#endif diff --git a/libselinux/src/policy.h b/libselinux/src/policy.h index bf270b5..2fd18f2 100644 --- a/libselinux/src/policy.h +++ b/libselinux/src/policy.h @@ -9,7 +9,7 @@ /* Initial length guess for getting contexts. */ #define INITCONTEXTLEN 255 -/* selinux file system type */ +/* selinux file system type string */ #define SELINUXFS "selinuxfs" /* selinuxfs magic number */ @@ -22,7 +22,9 @@ /* selinuxfs mount point */ extern char *selinux_mnt; +#ifndef ANDROID #define FILECONTEXTS "/etc/security/selinux/file_contexts" +#endif #define DEFAULT_POLICY_VERSION 15 diff --git a/libselinux/src/procattr.c b/libselinux/src/procattr.c index f990350..437e9eb 100644 --- a/libselinux/src/procattr.c +++ b/libselinux/src/procattr.c @@ -9,6 +9,7 @@ #include "selinux_internal.h" #include "policy.h" +#ifndef ANDROID #define UNSET (char *) -1 static __thread pid_t cpid; @@ -32,12 +33,16 @@ static int __selinux_atfork (void (*prepare) (void), void (*parent) (void), void return __register_atfork (prepare, parent, child, &__dso_handle == NULL ? NULL : __dso_handle); } +#endif +#if defined(HOST) && defined(ANDROID) || !defined(ANDROID) static pid_t gettid(void) { return syscall(__NR_gettid); } +#endif +#ifndef ANDROID static void procattr_thread_destructor(void __attribute__((unused)) *unused) { if (prev_current != UNSET) @@ -83,15 +88,18 @@ static void init_procattr(void) destructor_key_initialized = 1; } } +#endif static int openattr(pid_t pid, const char *attr, int flags) { int fd, rc; char *path; - +#ifdef ANDROID + pid_t tid = gettid(); +#else if (cpid != getpid()) free_procattr(); - +#endif if (pid > 0) rc = asprintf(&path, "/proc/%d/attr/%s", pid, attr); else { @@ -107,8 +115,13 @@ static int openattr(pid_t pid, const char *attr, int flags) return fd; } +#ifdef ANDROID +static int getprocattrcon(char ** context, + pid_t pid, const char *attr) +#else static int getprocattrcon_raw(char ** context, pid_t pid, const char *attr) +#endif { char *buf; size_t size; @@ -116,7 +129,7 @@ static int getprocattrcon_raw(char ** context, ssize_t ret; int errno_hold; char * prev_context; - +#ifndef ANDROID __selinux_once(once, init_procattr); init_thread_destructor(); @@ -154,7 +167,7 @@ static int getprocattrcon_raw(char ** context, } return 0; } - +#endif fd = openattr(pid, attr, O_RDONLY); if (fd < 0) return -1; @@ -193,6 +206,7 @@ static int getprocattrcon_raw(char ** context, return ret; } +#ifndef ANDROID static int getprocattrcon(char ** context, pid_t pid, const char *attr) { @@ -208,13 +222,20 @@ static int getprocattrcon(char ** context, return ret; } +#endif +#ifdef ANDROID +static int setprocattrcon(const char * context, + pid_t pid, const char *attr) +#else static int setprocattrcon_raw(const char * context, pid_t pid, const char *attr) +#endif { int fd; ssize_t ret; int errno_hold; +#ifndef ANDROID char **prev_context, *context2 = NULL; __selinux_once(once, init_procattr); @@ -249,17 +270,23 @@ static int setprocattrcon_raw(const char * context, if (context && *prev_context && *prev_context != UNSET && !strcmp(context, *prev_context)) return 0; - +#endif fd = openattr(pid, attr, O_RDWR); if (fd < 0) return -1; if (context) { +#ifndef ANDROID ret = -1; context2 = strdup(context); if (!context2) goto out; +#endif do { +#ifdef ANDROID + ret = write(fd, context, strlen(context) + 1); +#else ret = write(fd, context2, strlen(context2) + 1); +#endif } while (ret < 0 && errno == EINTR); } else { do { @@ -270,6 +297,12 @@ out: errno_hold = errno; close(fd); errno = errno_hold; +#ifdef ANDROID + if (ret < 0) + return -1; + else + return 0; +#else if (ret < 0) { free(context2); return -1; @@ -279,8 +312,10 @@ out: *prev_context = context2; return 0; } +#endif } +#ifndef ANDROID static int setprocattrcon(const char * context, pid_t pid, const char *attr) { @@ -296,7 +331,31 @@ static int setprocattrcon(const char * context, return ret; } +#endif +#ifdef ANDROID +#define getselfattr_def(fn, attr) \ + int get##fn(char **c) \ + { \ + return getprocattrcon(c, 0, #attr); \ + } + +#define setselfattr_def(fn, attr) \ + int set##fn(const char * c) \ + { \ + return setprocattrcon(c, 0, #attr); \ + } + +#define all_selfattr_def(fn, attr) \ + getselfattr_def(fn, attr) \ + setselfattr_def(fn, attr) + +#define getpidattr_def(fn, attr) \ + int get##fn(pid_t pid, char **c) \ + { \ + return getprocattrcon(c, pid, #attr); \ + } +#else #define getselfattr_def(fn, attr) \ int get##fn##_raw(char **c) \ { \ @@ -330,6 +389,7 @@ static int setprocattrcon(const char * context, { \ return getprocattrcon(c, pid, #attr); \ } +#endif all_selfattr_def(con, current) getpidattr_def(pidcon, current) diff --git a/libselinux/src/selinux_internal.h b/libselinux/src/selinux_internal.h index afb2170..ef047e2 100644 --- a/libselinux/src/selinux_internal.h +++ b/libselinux/src/selinux_internal.h @@ -101,8 +101,10 @@ hidden_proto(security_get_initial_context); hidden_proto(security_get_initial_context_raw); hidden_proto(selinux_reset_config); +#ifndef ANDROID extern int load_setlocaldefs hidden; extern int require_seusers hidden; +#endif extern int selinux_page_size hidden; /* Make pthread_once optional */ diff --git a/libselinux/src/setfilecon.c b/libselinux/src/setfilecon.c index d05969c..b36f50d 100644 --- a/libselinux/src/setfilecon.c +++ b/libselinux/src/setfilecon.c @@ -7,6 +7,13 @@ #include "selinux_internal.h" #include "policy.h" +#ifdef ANDROID +int setfilecon(const char *path, const char *context) +{ + return setxattr(path, XATTR_NAME_SELINUX, context, strlen(context) + 1, + 0); +} +#else int setfilecon_raw(const char *path, const char * context) { int rc = setxattr(path, XATTR_NAME_SELINUX, context, strlen(context) + 1, @@ -41,3 +48,4 @@ int setfilecon(const char *path, const char *context) return ret; } +#endif diff --git a/libselinux/src/stringrep.c b/libselinux/src/stringrep.c index 9ae8248..00aecdc 100644 --- a/libselinux/src/stringrep.c +++ b/libselinux/src/stringrep.c @@ -298,6 +298,7 @@ out: return rc; } +#ifndef ANDROID void print_access_vector(security_class_t tclass, access_vector_t av) { const char *permstr; @@ -325,3 +326,4 @@ void print_access_vector(security_class_t tclass, access_vector_t av) printf(" 0x%x", av); printf(" }"); } +#endif diff --git a/libsepol/MODULE_LICENSE_LGPL b/libsepol/MODULE_LICENSE_LGPL new file mode 100644 index 0000000..e69de29 diff --git a/libsepol/NOTICE b/libsepol/NOTICE new file mode 100644 index 0000000..8add30a --- /dev/null +++ b/libsepol/NOTICE @@ -0,0 +1,504 @@ + GNU LESSER GENERAL PUBLIC LICENSE + Version 2.1, February 1999 + + Copyright (C) 1991, 1999 Free Software Foundation, Inc. + 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + +[This is the first released version of the Lesser GPL. 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