security/tomoyo/group.c

   1 /*
   2  * security/tomoyo/group.c
   3  *
   4  * Copyright (C) 2005-2011  NTT DATA CORPORATION
   5  */
   6
   7 #include <linux/slab.h>
   8 #include "common.h"
   9
  10 /**
  11  * tomoyo_same_path_group - Check for duplicated "struct tomoyo_path_group" entry.
  12  *
  13  * @a: Pointer to "struct tomoyo_acl_head".
  14  * @b: Pointer to "struct tomoyo_acl_head".
  15  *
  16  * Returns true if @a == @b, false otherwise.
  17  */
  18 static bool tomoyo_same_path_group(const struct tomoyo_acl_head *a,
  19                                    const struct tomoyo_acl_head *b)
  20 {
  21         return container_of(a, struct tomoyo_path_group, head)->member_name ==
  22                 container_of(b, struct tomoyo_path_group, head)->member_name;
  23 }
  24
  25 /**
  26  * tomoyo_same_number_group - Check for duplicated "struct tomoyo_number_group" entry.
  27  *
  28  * @a: Pointer to "struct tomoyo_acl_head".
  29  * @b: Pointer to "struct tomoyo_acl_head".
  30  *
  31  * Returns true if @a == @b, false otherwise.
  32  */
  33 static bool tomoyo_same_number_group(const struct tomoyo_acl_head *a,
  34                                      const struct tomoyo_acl_head *b)
  35 {
  36         return !memcmp(&container_of(a, struct tomoyo_number_group, head)
  37                        ->number,
  38                        &container_of(b, struct tomoyo_number_group, head)
  39                        ->number,
  40                        sizeof(container_of(a, struct tomoyo_number_group, head)
  41                               ->number));
  42 }
  43
  44 /**
  45  * tomoyo_write_group - Write "struct tomoyo_path_group"/"struct tomoyo_number_group" list.
  46  *
  47  * @param: Pointer to "struct tomoyo_acl_param".
  48  * @type:  Type of this group.
  49  *
  50  * Returns 0 on success, negative value otherwise.
  51  */
  52 int tomoyo_write_group(struct tomoyo_acl_param *param, const u8 type)
  53 {
  54         struct tomoyo_group *group = tomoyo_get_group(param, type);
  55         int error = -EINVAL;
  56         if (!group)
  57                 return -ENOMEM;
  58         param->list = &group->member_list;
  59         if (type == TOMOYO_PATH_GROUP) {
  60                 struct tomoyo_path_group e = { };
  61                 e.member_name = tomoyo_get_name(tomoyo_read_token(param));
  62                 if (!e.member_name) {
  63                         error = -ENOMEM;
  64                         goto out;
  65                 }
  66                 error = tomoyo_update_policy(&e.head, sizeof(e), param,
  67                                           tomoyo_same_path_group);
  68                 tomoyo_put_name(e.member_name);
  69         } else if (type == TOMOYO_NUMBER_GROUP) {
  70                 struct tomoyo_number_group e = { };
  71                 if (param->data[0] == '@' ||
  72                     !tomoyo_parse_number_union(param, &e.number))
  73                         goto out;
  74                 error = tomoyo_update_policy(&e.head, sizeof(e), param,
  75                                           tomoyo_same_number_group);
  76                 /*
  77                  * tomoyo_put_number_union() is not needed because
  78                  * param->data[0] != '@'.
  79                  */
  80         }
  81 out:
  82         tomoyo_put_group(group);
  83         return error;
  84 }
  85
  86 /**
  87  * tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group.
  88  *
  89  * @pathname: The name of pathname.
  90  * @group:    Pointer to "struct tomoyo_path_group".
  91  *
  92  * Returns matched member's pathname if @pathname matches pathnames in @group,
  93  * NULL otherwise.
  94  *
  95  * Caller holds tomoyo_read_lock().
  96  */
  97 const struct tomoyo_path_info *
  98 tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
  99                           const struct tomoyo_group *group)
 100 {
 101         struct tomoyo_path_group *member;
 102         list_for_each_entry_rcu(member, &group->member_list, head.list) {
 103                 if (member->head.is_deleted)
 104                         continue;
 105                 if (!tomoyo_path_matches_pattern(pathname, member->member_name))
 106                         continue;
 107                 return member->member_name;
 108         }
 109         return NULL;
 110 }
 111
 112 /**
 113  * tomoyo_number_matches_group - Check whether the given number matches members of the given number group.
 114  *
 115  * @min:   Min number.
 116  * @max:   Max number.
 117  * @group: Pointer to "struct tomoyo_number_group".
 118  *
 119  * Returns true if @min and @max partially overlaps @group, false otherwise.
 120  *
 121  * Caller holds tomoyo_read_lock().
 122  */
 123 bool tomoyo_number_matches_group(const unsigned long min,
 124                                  const unsigned long max,
 125                                  const struct tomoyo_group *group)
 126 {
 127         struct tomoyo_number_group *member;
 128         bool matched = false;
 129         list_for_each_entry_rcu(member, &group->member_list, head.list) {
 130                 if (member->head.is_deleted)
 131                         continue;
 132                 if (min > member->number.values[1] ||
 133                     max < member->number.values[0])
 134                         continue;
 135                 matched = true;
 136                 break;
 137         }
 138         return matched;
 139 }