security/tomoyo/group.c

   1 /*
   2  * security/tomoyo/group.c
   3  *
   4  * Copyright (C) 2005-2010  NTT DATA CORPORATION
   5  */
   6
   7 #include <linux/slab.h>
   8 #include "common.h"
   9
  10 static bool tomoyo_same_path_group(const struct tomoyo_acl_head *a,
  11                                 const struct tomoyo_acl_head *b)
  12 {
  13         return container_of(a, struct tomoyo_path_group, head)->member_name ==
  14                 container_of(b, struct tomoyo_path_group, head)->member_name;
  15 }
  16
  17 static bool tomoyo_same_number_group(const struct tomoyo_acl_head *a,
  18                                   const struct tomoyo_acl_head *b)
  19 {
  20         return !memcmp(&container_of(a, struct tomoyo_number_group, head)
  21                        ->number,
  22                        &container_of(b, struct tomoyo_number_group, head)
  23                        ->number,
  24                        sizeof(container_of(a, struct tomoyo_number_group, head)
  25                               ->number));
  26 }
  27
  28 /**
  29  * tomoyo_write_group - Write "struct tomoyo_path_group"/"struct tomoyo_number_group" list.
  30  *
  31  * @param: Pointer to "struct tomoyo_acl_param".
  32  * @type:      Type of this group.
  33  *
  34  * Returns 0 on success, negative value otherwise.
  35  */
  36 int tomoyo_write_group(struct tomoyo_acl_param *param, const u8 type)
  37 {
  38         struct tomoyo_group *group = tomoyo_get_group(param, type);
  39         int error = -EINVAL;
  40         if (!group)
  41                 return -ENOMEM;
  42         param->list = &group->member_list;
  43         if (type == TOMOYO_PATH_GROUP) {
  44                 struct tomoyo_path_group e = { };
  45                 e.member_name = tomoyo_get_name(tomoyo_read_token(param));
  46                 if (!e.member_name) {
  47                         error = -ENOMEM;
  48                         goto out;
  49                 }
  50                 error = tomoyo_update_policy(&e.head, sizeof(e), param,
  51                                           tomoyo_same_path_group);
  52                 tomoyo_put_name(e.member_name);
  53         } else if (type == TOMOYO_NUMBER_GROUP) {
  54                 struct tomoyo_number_group e = { };
  55                 if (param->data[0] == '@' ||
  56                     !tomoyo_parse_number_union(param, &e.number))
  57                         goto out;
  58                 error = tomoyo_update_policy(&e.head, sizeof(e), param,
  59                                           tomoyo_same_number_group);
  60                 /*
  61                  * tomoyo_put_number_union() is not needed because
  62                  * param->data[0] != '@'.
  63                  */
  64         }
  65 out:
  66         tomoyo_put_group(group);
  67         return error;
  68 }
  69
  70 /**
  71  * tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group.
  72  *
  73  * @pathname:        The name of pathname.
  74  * @group:           Pointer to "struct tomoyo_path_group".
  75  *
  76  * Returns matched member's pathname if @pathname matches pathnames in @group,
  77  * NULL otherwise.
  78  *
  79  * Caller holds tomoyo_read_lock().
  80  */
  81 const struct tomoyo_path_info *
  82 tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
  83                           const struct tomoyo_group *group)
  84 {
  85         struct tomoyo_path_group *member;
  86         list_for_each_entry_rcu(member, &group->member_list, head.list) {
  87                 if (member->head.is_deleted)
  88                         continue;
  89                 if (!tomoyo_path_matches_pattern(pathname, member->member_name))
  90                         continue;
  91                 return member->member_name;
  92         }
  93         return NULL;
  94 }
  95
  96 /**
  97  * tomoyo_number_matches_group - Check whether the given number matches members of the given number group.
  98  *
  99  * @min:   Min number.
 100  * @max:   Max number.
 101  * @group: Pointer to "struct tomoyo_number_group".
 102  *
 103  * Returns true if @min and @max partially overlaps @group, false otherwise.
 104  *
 105  * Caller holds tomoyo_read_lock().
 106  */
 107 bool tomoyo_number_matches_group(const unsigned long min,
 108                                  const unsigned long max,
 109                                  const struct tomoyo_group *group)
 110 {
 111         struct tomoyo_number_group *member;
 112         bool matched = false;
 113         list_for_each_entry_rcu(member, &group->member_list, head.list) {
 114                 if (member->head.is_deleted)
 115                         continue;
 116                 if (min > member->number.values[1] ||
 117                     max < member->number.values[0])
 118                         continue;
 119                 matched = true;
 120                 break;
 121         }
 122         return matched;
 123 }