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Date: Thu, 14 Jun 2007 16:38:47 +0900
From: Kentaro Takeda <takedakn@...data.co.jp>
To: linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: [TOMOYO 8/9] File access control functions.
This is the main part for profiling and controlling file access.
We thought checking old pathname and new pathname separately
for rename() and link() operation is a too rough access control
and we are checking both pathnames using tomoyo_check_double_write_acl().
Signed-off-by: Kentaro Takeda <takedakn@...data.co.jp>
Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
---------------
security/tomoyo/file.c | 1126 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 1126 insertions(+)
diff -ubBpErN linux-2.6.21.5/security/tomoyo/file.c linux-2.6.21.5-tomoyo/security/tomoyo/file.c
--- linux-2.6.21.5/security/tomoyo/file.c 1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.21.5-tomoyo/security/tomoyo/file.c 2007-06-05 00:00:00.000000000 +0900
@@ -0,0 +1,1126 @@
+/*
+ * security/tomoyo/file.c
+ *
+ * File access control functions for TOMOYO Linux.
+ *
+ * Copyright (C) 2005-2007 NTT DATA CORPORATION
+ *
+ * Version: 2.0 2007/06/05
+ */
+
+#include "tomoyo.h"
+#include "realpath.h"
+#define ACC_MODE(x) ("\000\004\002\006"[(x)&O_ACCMODE])
+
+/************************* VARIABLES *************************/
+
+extern struct semaphore domain_acl_lock;
+
+/***** The structure for globally readable files. *****/
+
+struct globally_readable_file_entry {
+ struct globally_readable_file_entry *next;
+ const struct path_info *filename;
+ int is_deleted;
+};
+
+/***** The structure for filename patterns. *****/
+
+struct pattern_entry {
+ struct pattern_entry *next;
+ const struct path_info *pattern;
+ int is_deleted;
+};
+
+/***** The structure for non-rewritable-by-default file patterns. *****/
+
+struct no_rewrite_entry {
+ struct no_rewrite_entry *next;
+ const struct path_info *pattern;
+ int is_deleted;
+};
+
+/***** The structure for detailed write operations. *****/
+
+static struct {
+ const char *keyword;
+ const int paths;
+ int check_type;
+} acl_type_array[] = { /* mapping.txt */
+ { "create", 1, 1 }, /* TOMOYO_TYPE_CREATE_ACL */
+ { "unlink", 1, 1 }, /* TOMOYO_TYPE_UNLINK_ACL */
+ { "mkdir", 1, 1 }, /* TOMOYO_TYPE_MKDIR_ACL */
+ { "rmdir", 1, 1 }, /* TOMOYO_TYPE_RMDIR_ACL */
+ { "mkfifo", 1, 1 }, /* TOMOYO_TYPE_MKFIFO_ACL */
+ { "mksock", 1, 1 }, /* TOMOYO_TYPE_MKSOCK_ACL */
+ { "mkblock", 1, 1 }, /* TOMOYO_TYPE_MKBLOCK_ACL */
+ { "mkchar", 1, 1 }, /* TOMOYO_TYPE_MKCHAR_ACL */
+ { "truncate", 1, 1 }, /* TOMOYO_TYPE_TRUNCATE_ACL */
+ { "symlink", 1, 1 }, /* TOMOYO_TYPE_SYMLINK_ACL */
+ { "link", 2, 1 }, /* TOMOYO_TYPE_LINK_ACL */
+ { "rename", 2, 1 }, /* TOMOYO_TYPE_RENAME_ACL */
+ { "rewrite", 1, 1 }, /* TOMOYO_TYPE_REWRITE_ACL */
+ { NULL, 0, 0 }
+};
+
+/************************* UTILITY FUNCTIONS *************************/
+
+const char *tomoyo_acltype2keyword(const unsigned int acl_type)
+{
+ return (acl_type < sizeof(acl_type_array) / sizeof(acl_type_array[0]))
+ ? acl_type_array[acl_type].keyword : NULL;
+}
+
+int tomoyo_acltype2paths(const unsigned int acl_type)
+{
+ return (acl_type < sizeof(acl_type_array) / sizeof(acl_type_array[0]))
+ ? acl_type_array[acl_type].paths : 0;
+}
+
+static unsigned int tomoyo_check_acl_flags(const unsigned int index)
+{
+ if (index < (sizeof(acl_type_array) / sizeof(acl_type_array[0])) - 1)
+ return acl_type_array[index].check_type;
+ printk("%s: Index %u is out of range. Fix the kernel source.\n", __FUNCTION__, index);
+ return 0;
+}
+
+static int tomoyo_strendswith(const char *name, const char *tail)
+{
+ int len;
+ if (!name || !tail) return 0;
+ len = strlen(name) - strlen(tail);
+ return len >= 0 && strcmp(name + len, tail) == 0;
+}
+
+static struct path_info *tomoyo_get_path(struct dentry *dentry, struct vfsmount *mnt)
+{
+ struct path_info_with_data { /* sizeof(struct path_info_with_data) <= PAGE_SIZE */
+ struct path_info head; /* Keep this first, this pointer is passed to tomoyo_free(). */
+ char bariier1[16];
+ char body[TOMOYO_MAX_PATHNAME_LEN];
+ char barrier2[16];
+ } *buf = tomoyo_alloc(sizeof(*buf));
+ if (buf) {
+ int error;
+ if ((error = tomoyo_realpath_from_dentry2(dentry,
+ mnt,
+ buf->body,
+ sizeof(buf->body) - 1)) == 0) {
+ buf->head.name = buf->body;
+ tomoyo_fill_path_info(&buf->head);
+ return &buf->head;
+ }
+ tomoyo_free(buf);
+ buf = NULL;
+ printk("tomoyo_realpath_from_dentry = %d\n", error);
+ }
+ return NULL;
+}
+
+/************************* PROTOTYPES *************************/
+
+static int tomoyo_add_double_write_acl(const u8 type,
+ const char *filename1,
+ const char *filename2,
+ struct domain_info * const domain,
+ const u8 is_add);
+static int tomoyo_add_single_write_acl(const u8 type,
+ const char *filename,
+ struct domain_info * const domain,
+ const u8 is_add);
+
+/************************* AUDIT FUNCTIONS *************************/
+
+static int tomoyo_audit_file_log(const struct path_info *filename,
+ const u8 perm,
+ const int is_granted)
+{
+ char *buf;
+ int len;
+ len = filename->total_len + 8;
+ if ((buf = tomoyo_init_audit_log(&len)) == NULL) return -ENOMEM;
+ snprintf(buf + strlen(buf), len - strlen(buf) - 1, "%d %s\n", perm, filename->name);
+ return tomoyo_write_audit_log(buf, is_granted);
+}
+
+static int tomoyo_audit_write_log(const char *operation,
+ const struct path_info *filename1,
+ const struct path_info *filename2,
+ const int is_granted)
+{
+ char *buf;
+ int len;
+ len = strlen(operation) + filename1->total_len + (filename2 ? filename2->total_len : 0) + 16;
+ if ((buf = tomoyo_init_audit_log(&len)) == NULL) return -ENOMEM;
+ snprintf(buf + strlen(buf), len - strlen(buf) - 1, "allow_%s %s %s\n",
+ operation, filename1->name, filename2 ? filename2->name : "");
+ return tomoyo_write_audit_log(buf, is_granted);
+}
+
+/************************* PERMISSION MAP HANDLER *************************/
+
+int tomoyo_set_permission_mapping(struct io_buffer *head)
+{
+ int i;
+ char *data = head->write_buf;
+ char *cp = NULL;
+ if ((cp = strchr(data, '=')) == NULL) {
+ out: ;
+ printk("ERROR: Invalid line '%s=%s'\n", data, cp);
+ printk("This line must be one of the following. The first is the default.\n");
+ printk("%s=%s if you want to check this permission using this permission.\n",
+ data, data);
+ printk("%s=generic-write if you want to check this permission "
+ "using generic-write permission.\n", data);
+ printk("%s=no-check if you don't want to check this permission.\n", data);
+ return -EINVAL;
+ }
+ *cp++ = '\0';
+ for (i = 0; acl_type_array[i].keyword; i++) {
+ if (strcmp(acl_type_array[i].keyword, data)) continue;
+ if (strcmp(cp, acl_type_array[i].keyword) == 0) acl_type_array[i].check_type = 1;
+ else if (strcmp(cp, "generic-write") == 0) acl_type_array[i].check_type = 0;
+ else if (strcmp(cp, "no-check") == 0) acl_type_array[i].check_type = -1;
+ else goto out;
+ return 0;
+ }
+ printk("WARNING: Unprocessed line '%s=%s'\n", data, cp);
+ return -EINVAL;
+}
+
+int tomoyo_read_permission_mapping(struct io_buffer *head)
+{
+ if (!head->read_eof) {
+ int i;
+ for (i = 0; acl_type_array[i].keyword; i++) {
+ tomoyo_io_printf(head,
+ "%s=%s\n",
+ acl_type_array[i].keyword,
+ acl_type_array[i].check_type > 0 ?
+ acl_type_array[i].keyword :
+ acl_type_array[i].check_type == 0 ?
+ "generic-write" : "no-check");
+ }
+ head->read_eof = 1;
+ }
+ return 0;
+}
+
+/************************* GLOBALLY READABLE FILE HANDLER *************************/
+
+static struct globally_readable_file_entry *globally_readable_list = NULL;
+
+static int tomoyo_add_globally_readable_entry(const char *filename, const int is_delete)
+{
+ struct globally_readable_file_entry *new_entry, *ptr;
+ static DECLARE_MUTEX(lock);
+ const struct path_info *saved_filename;
+ int error = -ENOMEM;
+ if (!tomoyo_is_correct_path(filename, 1, -1, -1, __FUNCTION__))
+ return -EINVAL; /* No patterns allowed. */
+ if ((saved_filename = tomoyo_save_name(filename)) == NULL) return -ENOMEM;
+ down(&lock);
+ for (ptr = globally_readable_list; ptr; ptr = ptr->next) {
+ if (ptr->filename == saved_filename) {
+ ptr->is_deleted = is_delete;
+ error = 0;
+ goto out;
+ }
+ }
+ if (is_delete) {
+ error = -ENOENT;
+ goto out;
+ }
+ if ((new_entry = tomoyo_alloc_element(sizeof(*new_entry))) == NULL) goto out;
+ new_entry->filename = saved_filename;
+ mb(); /* Instead of using spinlock. */
+ if ((ptr = globally_readable_list) != NULL) {
+ while (ptr->next)
+ ptr = ptr->next;
+ ptr->next = new_entry;
+ } else {
+ globally_readable_list = new_entry;
+ }
+ error = 0;
+ out: ;
+ up(&lock);
+ return error;
+}
+
+static int tomoyo_is_globally_readable_file(const struct path_info *filename)
+{
+ struct globally_readable_file_entry *ptr;
+ for (ptr = globally_readable_list; ptr; ptr = ptr->next) {
+ if (!ptr->is_deleted && !tomoyo_pathcmp(filename, ptr->filename)) return 1;
+ }
+ return 0;
+}
+
+int tomoyo_add_globally_readable_policy(char *filename, const int is_delete)
+{
+ return tomoyo_add_globally_readable_entry(filename, is_delete);
+}
+
+int tomoyo_read_globally_readable_policy(struct io_buffer *head)
+{
+ struct globally_readable_file_entry *ptr = head->read_var2;
+ if (!ptr) ptr = globally_readable_list;
+ while (ptr) {
+ head->read_var2 = ptr;
+ if (!ptr->is_deleted && tomoyo_io_printf(head,
+ TOMOYO_KEYWORD_ALLOW_READ "%s\n",
+ ptr->filename->name))
+ break;
+ ptr = ptr->next;
+ }
+ return ptr ? -ENOMEM : 0;
+}
+
+/************************* FILE GROUP HANDLER *************************/
+
+static struct group_entry *group_list = NULL;
+
+static int tomoyo_add_group_entry(const char *group_name,
+ const char *member_name,
+ const int is_delete)
+{
+ static DECLARE_MUTEX(lock);
+ struct group_entry *new_group, *group;
+ struct group_member *new_member, *member;
+ const struct path_info *saved_group_name, *saved_member_name;
+ int error = -ENOMEM;
+ if (!tomoyo_is_correct_path(group_name, 0, 0, 0, __FUNCTION__) || !group_name[0] ||
+ !tomoyo_is_correct_path(member_name, 0, 0, 0, __FUNCTION__) || !member_name[0])
+ return -EINVAL;
+ if ((saved_group_name = tomoyo_save_name(group_name)) == NULL ||
+ (saved_member_name = tomoyo_save_name(member_name)) == NULL) return -ENOMEM;
+ down(&lock);
+ for (group = group_list; group; group = group->next) {
+ if (saved_group_name != group->group_name) continue;
+ for (member = group->first_member; member; member = member->next) {
+ if (member->member_name == saved_member_name) {
+ member->is_deleted = is_delete;
+ error = 0;
+ goto out;
+ }
+ }
+ break;
+ }
+ if (is_delete) {
+ error = -ENOENT;
+ goto out;
+ }
+ if (!group) {
+ if ((new_group = tomoyo_alloc_element(sizeof(*new_group))) == NULL) goto out;
+ new_group->group_name = saved_group_name;
+ mb(); /* Instead of using spinlock. */
+ if ((group = group_list) != NULL) {
+ while (group->next)
+ group = group->next;
+ group->next = new_group;
+ } else {
+ group_list= new_group;
+ }
+ group = new_group;
+ }
+ if ((new_member = tomoyo_alloc_element(sizeof(*new_member))) == NULL) goto out;
+ new_member->member_name = saved_member_name;
+ mb(); /* Instead of using spinlock. */
+ if ((member = group->first_member) != NULL) {
+ while (member->next)
+ member = member->next;
+ member->next = new_member;
+ } else {
+ group->first_member = new_member;
+ }
+ error = 0;
+ out:
+ up(&lock);
+ return error;
+}
+
+int tomoyo_add_group_policy(char *data, const int is_delete)
+{
+ char *cp = strchr(data, ' ');
+ if (!cp) return -EINVAL;
+ *cp++ = '\0';
+ return tomoyo_add_group_entry(data, cp, is_delete);
+}
+
+static struct group_entry *tomoyo_find_or_assign_new_group(const char *group_name)
+{
+ int i;
+ struct group_entry *group;
+ for (i = 0; i <= 1; i++) {
+ for (group = group_list; group; group = group->next) {
+ if (strcmp(group_name, group->group_name->name) == 0) return group;
+ }
+ if (i == 0) {
+ tomoyo_add_group_entry(group_name, "/", 0);
+ tomoyo_add_group_entry(group_name, "/", 1);
+ }
+ }
+ return NULL;
+}
+
+static int tomoyo_path_matchies_to_group(const struct path_info *pathname,
+ const struct group_entry *group,
+ const int may_use_pattern)
+{
+ struct group_member *member;
+ for (member = group->first_member; member; member = member->next) {
+ if (member->is_deleted) continue;
+ if (!member->member_name->is_patterned) {
+ if (!tomoyo_pathcmp(pathname, member->member_name)) return 1;
+ } else if (may_use_pattern) {
+ if (tomoyo_path_matches_to_pattern(pathname, member->member_name)) return 1;
+ }
+ }
+ return 0;
+}
+
+int tomoyo_read_group_policy(struct io_buffer *head)
+{
+ struct group_entry *group = head->read_var1;
+ struct group_member *member = head->read_var2;
+ if (!group) group = group_list;
+ while (group) {
+ head->read_var1 = group;
+ if (!member) member = group->first_member;
+ while (member) {
+ head->read_var2 = member;
+ if (!member->is_deleted &&
+ tomoyo_io_printf(head,
+ TOMOYO_KEYWORD_PATH_GROUP "%s %s\n",
+ group->group_name->name,
+ member->member_name->name))
+ break;
+ member = member->next;
+ }
+ if (member) break;
+ head->read_var2 = NULL;
+ group = group->next;
+ }
+ return group ? -ENOMEM : 0;
+}
+
+/************************* FILE PATTERN HANDLER *************************/
+
+static struct pattern_entry *pattern_list = NULL;
+
+static int tomoyo_add_pattern_entry(const char *pattern, const int is_delete)
+{
+ struct pattern_entry *new_entry, *ptr;
+ static DECLARE_MUTEX(lock);
+ const struct path_info *saved_pattern;
+ int error = -ENOMEM;
+ if (!tomoyo_is_correct_path(pattern, 0, 1, 0, __FUNCTION__)) return -EINVAL;
+ if ((saved_pattern = tomoyo_save_name(pattern)) == NULL) return -ENOMEM;
+ down(&lock);
+ for (ptr = pattern_list; ptr; ptr = ptr->next) {
+ if (saved_pattern == ptr->pattern) {
+ ptr->is_deleted = is_delete;
+ error = 0;
+ goto out;
+ }
+ }
+ if (is_delete) {
+ error = -ENOENT;
+ goto out;
+ }
+ if ((new_entry = tomoyo_alloc_element(sizeof(*new_entry))) == NULL) goto out;
+ new_entry->pattern = saved_pattern;
+ mb(); /* Instead of using spinlock. */
+ if ((ptr = pattern_list) != NULL) {
+ while (ptr->next)
+ ptr = ptr->next;
+ ptr->next = new_entry;
+ } else {
+ pattern_list = new_entry;
+ }
+ error = 0;
+ out:
+ up(&lock);
+ return error;
+}
+
+static const struct path_info *tomoyo_get_pattern(const struct path_info *filename)
+{
+ struct pattern_entry *ptr;
+ const struct path_info *pattern = NULL;
+ for (ptr = pattern_list; ptr; ptr = ptr->next) {
+ if (ptr->is_deleted) continue;
+ if (!tomoyo_path_matches_to_pattern(filename, ptr->pattern)) continue;
+ pattern = ptr->pattern;
+ if (tomoyo_strendswith(pattern->name, "/\\*")) {
+ /* Do nothing. Try to find the better match. */
+ } else {
+ /* This would be the better match. Use this. */
+ break;
+ }
+ }
+ if (pattern) filename = pattern;
+ return filename;
+}
+
+int tomoyo_add_pattern_policy(char *pattern, const int is_delete)
+{
+ return tomoyo_add_pattern_entry(pattern, is_delete);
+}
+
+int tomoyo_read_pattern_policy(struct io_buffer *head)
+{
+ struct pattern_entry *ptr = head->read_var2;
+ if (!ptr) ptr = pattern_list;
+ while (ptr) {
+ head->read_var2 = ptr;
+ if (!ptr->is_deleted &&
+ tomoyo_io_printf(head,
+ TOMOYO_KEYWORD_FILE_PATTERN "%s\n",
+ ptr->pattern->name))
+ break;
+ ptr = ptr->next;
+ }
+ return ptr ? -ENOMEM : 0;
+}
+
+/************************* NON REWRITABLE FILE HANDLER *************************/
+
+static struct no_rewrite_entry *no_rewrite_list = NULL;
+
+static int tomoyo_add_no_rewrite_entry(const char *pattern, const int is_delete)
+{
+ struct no_rewrite_entry *new_entry, *ptr;
+ static DECLARE_MUTEX(lock);
+ const struct path_info *saved_pattern;
+ int error = -ENOMEM;
+ if (!tomoyo_is_correct_path(pattern, 0, 0, 0, __FUNCTION__)) return -EINVAL;
+ if ((saved_pattern = tomoyo_save_name(pattern)) == NULL) return -ENOMEM;
+ down(&lock);
+ for (ptr = no_rewrite_list; ptr; ptr = ptr->next) {
+ if (ptr->pattern == saved_pattern) {
+ ptr->is_deleted = is_delete;
+ error = 0;
+ goto out;
+ }
+ }
+ if (is_delete) {
+ error = -ENOENT;
+ goto out;
+ }
+ if ((new_entry = tomoyo_alloc_element(sizeof(*new_entry))) == NULL) goto out;
+ new_entry->pattern = saved_pattern;
+ mb(); /* Instead of using spinlock. */
+ if ((ptr = no_rewrite_list) != NULL) {
+ while (ptr->next)
+ ptr = ptr->next;
+ ptr->next = new_entry;
+ } else {
+ no_rewrite_list = new_entry;
+ }
+ error = 0;
+ out:
+ up(&lock);
+ return error;
+}
+
+static int tomoyo_is_no_rewrite_file(const struct path_info *filename)
+{
+ struct no_rewrite_entry *ptr;
+ for (ptr = no_rewrite_list; ptr; ptr = ptr->next) {
+ if (ptr->is_deleted) continue;
+ if (!tomoyo_path_matches_to_pattern(filename, ptr->pattern)) continue;
+ return 1;
+ }
+ return 0;
+}
+
+int tomoyo_add_no_rewrite_policy(char *pattern, const int is_delete)
+{
+ return tomoyo_add_no_rewrite_entry(pattern, is_delete);
+}
+
+int tomoyo_read_no_rewrite_policy(struct io_buffer *head)
+{
+ struct no_rewrite_entry *ptr = head->read_var2;
+ if (!ptr) ptr = no_rewrite_list;
+ while (ptr) {
+ head->read_var2 = ptr;
+ if (!ptr->is_deleted &&
+ tomoyo_io_printf(head,
+ TOMOYO_KEYWORD_DENY_REWRITE "%s\n",
+ ptr->pattern->name))
+ break;
+ ptr = ptr->next;
+ }
+ return ptr ? -ENOMEM : 0;
+}
+
+/************************* FILE ACL HANDLER *************************/
+
+static int tomoyo_add_file_acl(const char *filename,
+ u8 perm,
+ struct domain_info * const domain,
+ const u8 is_add)
+{
+ const struct path_info *saved_filename;
+ struct acl_info *ptr;
+ int error = -ENOMEM;
+ u8 is_group = 0;
+ if (!domain) return -EINVAL;
+ if (perm > 7 || !perm) {
+ printk(KERN_DEBUG "%s: Invalid permission '%d %s'\n", __FUNCTION__, perm, filename);
+ return -EINVAL;
+ }
+ if (!tomoyo_is_correct_path(filename, 0, 0, 0, __FUNCTION__)) return -EINVAL;
+ if (filename[0] == '@') {
+ /* This cast is OK because I don't dereference in this function. */
+ if ((saved_filename =
+ (struct path_info *) tomoyo_find_or_assign_new_group(filename + 1)) == NULL)
+ return -ENOMEM;
+ is_group = 1;
+ } else {
+ if ((saved_filename = tomoyo_save_name(filename)) == NULL) return -ENOMEM;
+ if (!saved_filename->is_dir) {
+ if (perm == 4 &&
+ tomoyo_is_globally_readable_file(saved_filename) &&
+ is_add) {
+ return 0; /* Don't add if the file is globally readable files. */
+ }
+ } else {
+ if ((perm & 2) == 0)
+ return 0; /* Don't add if the directory doesn't have write permission. */
+ }
+ }
+ down(&domain_acl_lock);
+ if (is_add) {
+ if ((ptr = domain->first_acl_ptr) == NULL) goto first_entry;
+ while (1) {
+ struct file_acl_record *new_ptr;
+ if (ptr->type == TOMOYO_TYPE_FILE_ACL) {
+ if (((struct file_acl_record *) ptr)->u.filename == saved_filename) {
+ if (ptr->is_deleted) {
+ ptr->u.b[0] = 0;
+ mb();
+ ptr->is_deleted = 0;
+ }
+ /* Found. Just 'OR' the permission bits. */
+ ptr->u.b[0] |= perm;
+ error = 0;
+ tomoyo_update_counter(TOMOYO_UPDATES_COUNTER_DOMAIN_POLICY);
+ break;
+ }
+ }
+ if (ptr->next) {
+ ptr = ptr->next;
+ continue;
+ }
+ first_entry: ;
+ if (is_add == 1 && tomoyo_too_many_domain_acl(domain)) break;
+ /* Not found. Append it to the tail. */
+ if ((new_ptr = tomoyo_alloc_element(sizeof(*new_ptr))) == NULL) break;
+ new_ptr->head.type = TOMOYO_TYPE_FILE_ACL;
+ new_ptr->head.u.b[0] = perm;
+ new_ptr->head.u.b[1] = is_group;
+ new_ptr->u.filename = saved_filename;
+ error = tomoyo_add_domain_acl(ptr, domain, (struct acl_info *) new_ptr);
+ break;
+ }
+ } else {
+ for (ptr = domain->first_acl_ptr; ptr; ptr = ptr->next) {
+ if (ptr->type != TOMOYO_TYPE_FILE_ACL ||
+ ptr->is_deleted ||
+ ptr->u.b[0] != perm)
+ continue;
+ if (((struct file_acl_record *) ptr)->u.filename != saved_filename) continue;
+ error = tomoyo_del_domain_acl(ptr);
+ break;
+ }
+ }
+ up(&domain_acl_lock);
+ return error;
+}
+
+static int tomoyo_check_file_acl(const struct path_info *filename, const u8 perm)
+{
+ const struct domain_info *domain =
+ ((struct tomoyo_security *) current->security)->domain_info;
+ struct acl_info *ptr;
+ const int may_use_pattern = ((perm & 1) == 0);
+ if (!tomoyo_check_flags(TOMOYO_MAC_FOR_FILE)) return 0;
+ if (!filename->is_dir) {
+ if (perm == 4 && tomoyo_is_globally_readable_file(filename)) return 0;
+ }
+ for (ptr = domain->first_acl_ptr; ptr; ptr = ptr->next) {
+ if (ptr->type != TOMOYO_TYPE_FILE_ACL ||
+ ptr->is_deleted ||
+ (ptr->u.b[0] & perm) != perm)
+ continue;
+ if (ptr->u.b[1]) {
+ if (tomoyo_path_matchies_to_group(filename,
+ ((struct file_acl_record *) ptr)->u.group,
+ may_use_pattern))
+ return 0;
+ } else if (may_use_pattern ||
+ !((struct file_acl_record *) ptr)->u.filename->is_patterned) {
+ if (tomoyo_path_matches_to_pattern(filename,
+ ((struct file_acl_record *) ptr)->u.filename))
+ return 0;
+ }
+ }
+ return -EPERM;
+}
+
+static int tomoyo_check_file_perm2(const struct path_info *filename, const u8 perm, const char *operation)
+{
+ int error = 0;
+ if (!filename) return 0;
+ error = tomoyo_check_file_acl(filename, perm);
+ tomoyo_audit_file_log(filename, perm, !error);
+ if (error) {
+ struct domain_info * const domain =
+ ((struct tomoyo_security *) current->security)->domain_info;
+ const int is_enforce = tomoyo_check_enforce(TOMOYO_MAC_FOR_FILE);
+ if (tomoyo_verbose_mode()) {
+ printk("TOMOYO-%s: Access %d(%s) to %s denied for %s\n",
+ tomoyo_get_msg(is_enforce), perm, operation,
+ filename->name, tomoyo_get_last_name(domain));
+ }
+ if (is_enforce) error =
+ tomoyo_check_supervisor("%s\n%d %s\n",
+ domain->domainname->name, perm, filename->name);
+ else if (tomoyo_check_accept(TOMOYO_MAC_FOR_FILE)) {
+ /* Don't use patterns if execution bit is on. */
+ const struct path_info *patterned_file =
+ ((perm & 1) == 0) ? tomoyo_get_pattern(filename) : filename;
+ tomoyo_add_file_acl(patterned_file->name, perm, domain, 1);
+ }
+ if (!is_enforce) error = 0;
+ }
+ return error;
+}
+
+int tomoyo_add_file_policy(char *data, struct domain_info *domain, const int is_delete)
+{
+ char *filename = strchr(data, ' ');
+ unsigned int perm;
+ u8 type;
+ if (!filename) return -EINVAL;
+ *filename++ = '\0';
+ if (sscanf(data, "%u", &perm) == 1) {
+ return tomoyo_add_file_acl(filename, (u8) perm, domain, is_delete ? 0 : -1);
+ }
+ if (strncmp(data, "allow_", 6)) goto out;
+ data += 6;
+ for (type = 0; acl_type_array[type].keyword; type++) {
+ if (strcmp(data, acl_type_array[type].keyword)) continue;
+ if (acl_type_array[type].paths == 2) {
+ char *filename2 = strchr(filename, ' ');
+ if (!filename2) break;
+ *filename2++ = '\0';
+ return tomoyo_add_double_write_acl(type,
+ filename,
+ filename2,
+ domain,
+ is_delete ? 0 : -1);
+ } else {
+ return tomoyo_add_single_write_acl(type,
+ filename,
+ domain,
+ is_delete ? 0 : -1);
+ }
+ break;
+ }
+ out:
+ return -EINVAL;
+}
+
+static int tomoyo_add_single_write_acl(const u8 type,
+ const char *filename,
+ struct domain_info * const domain,
+ const u8 is_add)
+{
+ const struct path_info *saved_filename;
+ struct acl_info *ptr;
+ int error = -ENOMEM;
+ u8 is_group = 0;
+ if (!domain) return -EINVAL;
+ if (!tomoyo_is_correct_path(filename, 0, 0, 0, __FUNCTION__)) return -EINVAL;
+ if (filename[0] == '@') {
+ /* This cast is OK because I don't dereference in this function. */
+ if ((saved_filename =
+ (struct path_info *) tomoyo_find_or_assign_new_group(filename + 1)) == NULL)
+ return -ENOMEM;
+ is_group = 1;
+ } else {
+ if ((saved_filename = tomoyo_save_name(filename)) == NULL) return -ENOMEM;
+ }
+ down(&domain_acl_lock);
+ if (is_add) {
+ if ((ptr = domain->first_acl_ptr) == NULL) goto first_entry;
+ while (1) {
+ struct single_acl_record *new_ptr;
+ if (ptr->type == type) {
+ if (((struct single_acl_record *) ptr)->u.filename ==
+ saved_filename) {
+ ptr->is_deleted = 0;
+ /* Found. Nothing to do. */
+ error = 0;
+ break;
+ }
+ }
+ if (ptr->next) {
+ ptr = ptr->next;
+ continue;
+ }
+ first_entry: ;
+ if (is_add == 1 && tomoyo_too_many_domain_acl(domain)) break;
+ /* Not found. Append it to the tail. */
+ if ((new_ptr = tomoyo_alloc_element(sizeof(*new_ptr))) == NULL) break;
+ new_ptr->head.type = type;
+ new_ptr->head.u.w = is_group;
+ new_ptr->u.filename = saved_filename;
+ error = tomoyo_add_domain_acl(ptr, domain, (struct acl_info *) new_ptr);
+ break;
+ }
+ } else {
+ error = -ENOENT;
+ for (ptr = domain->first_acl_ptr; ptr; ptr = ptr->next) {
+ if (ptr->type != type || ptr->is_deleted) continue;
+ if (((struct single_acl_record *) ptr)->u.filename != saved_filename)
+ continue;
+ error = tomoyo_del_domain_acl(ptr);
+ break;
+ }
+ }
+ up(&domain_acl_lock);
+ return error;
+}
+
+static int tomoyo_add_double_write_acl(const u8 type,
+ const char *filename1,
+ const char *filename2,
+ struct domain_info * const domain,
+ const u8 is_add)
+{
+ const struct path_info *saved_filename1, *saved_filename2;
+ struct acl_info *ptr;
+ int error = -ENOMEM;
+ u8 is_group1 = 0, is_group2 = 0;
+ if (!domain) return -EINVAL;
+ if (!tomoyo_is_correct_path(filename1, 0, 0, 0, __FUNCTION__) ||
+ !tomoyo_is_correct_path(filename2, 0, 0, 0, __FUNCTION__))
+ return -EINVAL;
+ if (filename1[0] == '@') {
+ /* This cast is OK because I don't dereference in this function. */
+ if ((saved_filename1 =
+ (struct path_info *) tomoyo_find_or_assign_new_group(filename1 + 1)) == NULL)
+ return -ENOMEM;
+ is_group1 = 1;
+ } else {
+ if ((saved_filename1 = tomoyo_save_name(filename1)) == NULL) return -ENOMEM;
+ }
+ if (filename2[0] == '@') {
+ /* This cast is OK because I don't dereference in this function. */
+ if ((saved_filename2 =
+ (struct path_info *) tomoyo_find_or_assign_new_group(filename2 + 1)) == NULL)
+ return -ENOMEM;
+ is_group2 = 1;
+ } else {
+ if ((saved_filename2 = tomoyo_save_name(filename2)) == NULL) return -ENOMEM;
+ }
+ down(&domain_acl_lock);
+ if (is_add) {
+ if ((ptr = domain->first_acl_ptr) == NULL) goto first_entry;
+ while (1) {
+ struct double_acl_record *new_ptr;
+ if (ptr->type == type) {
+ if (((struct double_acl_record *) ptr)->u1.filename1 ==
+ saved_filename1 &&
+ ((struct double_acl_record *) ptr)->u2.filename2 ==
+ saved_filename2) {
+ ptr->is_deleted = 0;
+ /* Found. Nothing to do. */
+ error = 0;
+ break;
+ }
+ }
+ if (ptr->next) {
+ ptr = ptr->next;
+ continue;
+ }
+ first_entry: ;
+ if (is_add == 1 && tomoyo_too_many_domain_acl(domain)) break;
+ /* Not found. Append it to the tail. */
+ if ((new_ptr = tomoyo_alloc_element(sizeof(*new_ptr))) == NULL) break;
+ new_ptr->head.type = type;
+ new_ptr->head.u.b[0] = is_group1;
+ new_ptr->head.u.b[1] = is_group2;
+ new_ptr->u1.filename1 = saved_filename1;
+ new_ptr->u2.filename2 = saved_filename2;
+ error = tomoyo_add_domain_acl(ptr, domain, (struct acl_info *) new_ptr);
+ break;
+ }
+ } else {
+ error = -ENOENT;
+ for (ptr = domain->first_acl_ptr; ptr; ptr = ptr->next) {
+ if (ptr->type != type || ptr->is_deleted) continue;
+ if (((struct double_acl_record *) ptr)->u1.filename1 != saved_filename1 ||
+ ((struct double_acl_record *) ptr)->u2.filename2 != saved_filename2)
+ continue;
+ error = tomoyo_del_domain_acl(ptr);
+ break;
+ }
+ }
+ up(&domain_acl_lock);
+ return error;
+}
+
+static int tomoyo_check_single_write_acl(const u8 type, const struct path_info *filename)
+{
+ const struct domain_info *domain =
+ ((struct tomoyo_security *) current->security)->domain_info;
+ struct acl_info *ptr;
+ if (!tomoyo_check_flags(TOMOYO_MAC_FOR_FILE)) return 0;
+ for (ptr = domain->first_acl_ptr; ptr; ptr = ptr->next) {
+ if (ptr->type != type || ptr->is_deleted) continue;
+ if (ptr->u.w) {
+ if (!tomoyo_path_matchies_to_group(filename,
+ ((struct single_acl_record *) ptr)->u.group,
+ 1))
+ continue;
+ } else {
+ if (!tomoyo_path_matches_to_pattern(filename,
+ ((struct single_acl_record *) ptr)->u.filename))
+ continue;
+ }
+ return 0;
+ }
+ return -EPERM;
+}
+
+static int tomoyo_check_double_write_acl(const u8 type,
+ const struct path_info *filename1,
+ const struct path_info *filename2)
+{
+ const struct domain_info *domain =
+ ((struct tomoyo_security *) current->security)->domain_info;
+ struct acl_info *ptr;
+ if (!tomoyo_check_flags(TOMOYO_MAC_FOR_FILE)) return 0;
+ for (ptr = domain->first_acl_ptr; ptr; ptr = ptr->next) {
+ if (ptr->type != type || ptr->is_deleted) continue;
+ if (ptr->u.b[0]) {
+ if (!tomoyo_path_matchies_to_group(filename1,
+ ((struct double_acl_record *) ptr)->u1.group1,
+ 1))
+ continue;
+ } else {
+ if (!tomoyo_path_matches_to_pattern(filename1,
+ ((struct double_acl_record *) ptr)->u1.filename1))
+ continue;
+ }
+ if (ptr->u.b[1]) {
+ if (!tomoyo_path_matchies_to_group(filename2,
+ ((struct double_acl_record *) ptr)->u2.group2,
+ 1))
+ continue;
+ } else {
+ if (!tomoyo_path_matches_to_pattern(filename2,
+ ((struct double_acl_record *) ptr)->u2.filename2))
+ continue;
+ }
+ return 0;
+ }
+ return -EPERM;
+}
+
+static int tomoyo_check_single_write_permission2(const unsigned int operation,
+ const struct path_info *filename)
+{
+ int error;
+ struct domain_info * const domain =
+ ((struct tomoyo_security *) current->security)->domain_info;
+ const int is_enforce = tomoyo_check_enforce(TOMOYO_MAC_FOR_FILE);
+ if (!tomoyo_check_flags(TOMOYO_MAC_FOR_FILE)) return 0;
+ if (tomoyo_check_acl_flags(operation) < 0) return 0;
+ if (tomoyo_check_acl_flags(operation) > 0) {
+ error = tomoyo_check_single_write_acl(operation, filename);
+ tomoyo_audit_write_log(tomoyo_acltype2keyword(operation), filename, NULL, !error);
+ if (error) {
+ if (tomoyo_verbose_mode()) {
+ printk("TOMOYO-%s: Access '%s %s' denied for %s\n",
+ tomoyo_get_msg(is_enforce),
+ tomoyo_acltype2keyword(operation),
+ filename->name,
+ tomoyo_get_last_name(domain));
+ }
+ if (is_enforce)
+ error = tomoyo_check_supervisor("%s\nallow_%s %s\n",
+ domain->domainname->name,
+ tomoyo_acltype2keyword(operation),
+ filename->name);
+ else if (tomoyo_check_accept(TOMOYO_MAC_FOR_FILE))
+ tomoyo_add_single_write_acl(operation,
+ tomoyo_get_pattern(filename)->name,
+ domain,
+ 1);
+ if (!is_enforce)
+ error = 0;
+ }
+ } else {
+ error = tomoyo_check_file_perm2(filename, 2, tomoyo_acltype2keyword(operation));
+ }
+ if (!error && operation == TOMOYO_TYPE_TRUNCATE_ACL && tomoyo_is_no_rewrite_file(filename)) {
+ error = tomoyo_check_single_write_permission2(TOMOYO_TYPE_REWRITE_ACL, filename);
+ }
+ return error;
+}
+
+int tomoyo_check_exec_perm(const struct path_info *filename, struct file *filp)
+{
+ if (!tomoyo_check_flags(TOMOYO_MAC_FOR_FILE)) return 0;
+ return tomoyo_check_file_perm2(filename, 1, "do_execve");
+}
+
+int tomoyo_check_open_permission(struct dentry *dentry, struct vfsmount *mnt, const int flag)
+{
+ const int acc_mode = ACC_MODE(flag);
+ int error = -ENOMEM;
+ struct path_info *buf;
+ const int is_enforce = tomoyo_check_enforce(TOMOYO_MAC_FOR_FILE);
+ if (!tomoyo_check_flags(TOMOYO_MAC_FOR_FILE)) return 0;
+ if (acc_mode == 0) return 0;
+ if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) {
+ /* I don't check directories here because mkdir() and rmdir() don't call me. */
+ return 0;
+ }
+ buf = tomoyo_get_path(dentry, mnt);
+ if (buf) {
+ error = 0;
+ if ((acc_mode & MAY_WRITE)) {
+ if ((flag & O_TRUNC) || !(flag & O_APPEND)) {
+ if (tomoyo_is_no_rewrite_file(buf)) {
+ error = tomoyo_check_single_write_permission2(TOMOYO_TYPE_REWRITE_ACL,
+ buf);
+ }
+ }
+ }
+ if (error == 0) error = tomoyo_check_file_perm2(buf, acc_mode, "open");
+ if (error == 0 && (flag & O_TRUNC))
+ error = tomoyo_check_single_write_permission2(TOMOYO_TYPE_TRUNCATE_ACL, buf);
+ tomoyo_free(buf);
+ }
+ if (!is_enforce) error = 0;
+ return error;
+}
+
+int tomoyo_check_single_write_permission(const unsigned int operation,
+ struct dentry *dentry,
+ struct vfsmount *mnt)
+{
+ int error = -ENOMEM;
+ struct path_info *buf;
+ const int is_enforce = tomoyo_check_enforce(TOMOYO_MAC_FOR_FILE);
+ if (!tomoyo_check_flags(TOMOYO_MAC_FOR_FILE)) return 0;
+ buf = tomoyo_get_path(dentry, mnt);
+ if (buf) {
+ switch (operation) {
+ case TOMOYO_TYPE_MKDIR_ACL:
+ case TOMOYO_TYPE_RMDIR_ACL:
+ if (!buf->is_dir) {
+ strcat((char *) buf->name, "/");
+ tomoyo_fill_path_info(buf);
+ }
+ }
+ error = tomoyo_check_single_write_permission2(operation, buf);
+ tomoyo_free(buf);
+ }
+ if (!is_enforce) error = 0;
+ return error;
+}
+
+int tomoyo_check_rewrite_permission(struct file *filp)
+{
+ int error = -ENOMEM;
+ const int is_enforce = tomoyo_check_enforce(TOMOYO_MAC_FOR_FILE);
+ struct path_info *buf = tomoyo_get_path(filp->f_dentry, filp->f_vfsmnt);
+ if (buf) {
+ if (tomoyo_is_no_rewrite_file(buf)) {
+ error = tomoyo_check_single_write_permission2(TOMOYO_TYPE_REWRITE_ACL, buf);
+ } else {
+ error = 0;
+ }
+ tomoyo_free(buf);
+ }
+ if (!is_enforce) error = 0;
+ return error;
+}
+
+int tomoyo_check_double_write_permission(const unsigned int operation,
+ struct dentry *dentry1,
+ struct vfsmount *mnt1,
+ struct dentry *dentry2,
+ struct vfsmount *mnt2)
+{
+ int error = -ENOMEM;
+ struct path_info *buf1, *buf2;
+ struct domain_info * const domain =
+ ((struct tomoyo_security *) current->security)->domain_info;
+ const int is_enforce = tomoyo_check_enforce(TOMOYO_MAC_FOR_FILE);
+ if (!tomoyo_check_flags(TOMOYO_MAC_FOR_FILE)) return 0;
+ if (tomoyo_check_acl_flags(operation) < 0) return 0;
+ buf1 = tomoyo_get_path(dentry1, mnt1);
+ buf2 = tomoyo_get_path(dentry2, mnt2);
+ if (buf1 && buf2) {
+ if (operation == TOMOYO_TYPE_RENAME_ACL) {
+ /* TOMOYO_TYPE_LINK_ACL can't reach here for directory. */
+ if (dentry1->d_inode && S_ISDIR(dentry1->d_inode->i_mode)) {
+ if (!buf1->is_dir) {
+ strcat((char *) buf1->name, "/");
+ tomoyo_fill_path_info(buf1);
+ }
+ if (!buf2->is_dir) {
+ strcat((char *) buf2->name, "/");
+ tomoyo_fill_path_info(buf2);
+ }
+ }
+ }
+ if (tomoyo_check_acl_flags(operation) > 0) {
+ error = tomoyo_check_double_write_acl(operation, buf1, buf2);
+ tomoyo_audit_write_log(tomoyo_acltype2keyword(operation), buf1, buf2, !error);
+ if (error) {
+ if (tomoyo_verbose_mode()) {
+ printk("TOMOYO-%s: Access '%s %s %s' denied for %s\n",
+ tomoyo_get_msg(is_enforce),
+ tomoyo_acltype2keyword(operation),
+ buf1->name,
+ buf2->name,
+ tomoyo_get_last_name(domain));
+ }
+ if (is_enforce)
+ error = tomoyo_check_supervisor("%s\nallow_%s %s %s\n",
+ domain->domainname->name,
+ tomoyo_acltype2keyword(operation),
+ buf1->name,
+ buf2->name);
+ else if (tomoyo_check_accept(TOMOYO_MAC_FOR_FILE))
+ tomoyo_add_double_write_acl(operation,
+ tomoyo_get_pattern(buf1)->name,
+ tomoyo_get_pattern(buf2)->name,
+ domain,
+ 1);
+ }
+ } else {
+ error = tomoyo_check_file_perm2(buf1, 2, tomoyo_acltype2keyword(operation));
+ if (!error)
+ error = tomoyo_check_file_perm2(buf2,
+ 2,
+ tomoyo_acltype2keyword(operation));
+ }
+ }
+ tomoyo_free(buf1);
+ tomoyo_free(buf2);
+ if (!is_enforce) error = 0;
+ return error;
+}
---------------
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