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_same_address_group - Check for duplicated "struct tomoyo_address_group" entry.
  46  *
  47  * @a: Pointer to "struct tomoyo_acl_head".
  48  * @b: Pointer to "struct tomoyo_acl_head".
  49  *
  50  * Returns true if @a == @b, false otherwise.
  51  */
  52 static bool tomoyo_same_address_group(const struct tomoyo_acl_head *a,
  53                                       const struct tomoyo_acl_head *b)
  54 {
  55         const struct tomoyo_address_group *p1 = container_of(a, typeof(*p1),
  56                                                              head);
  57         const struct tomoyo_address_group *p2 = container_of(b, typeof(*p2),
  58                                                              head);
  59
  60         return tomoyo_same_ipaddr_union(&p1->address, &p2->address);
  61 }
  62
  63 /**
  64  * tomoyo_write_group - Write "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
  65  *
  66  * @param: Pointer to "struct tomoyo_acl_param".
  67  * @type:  Type of this group.
  68  *
  69  * Returns 0 on success, negative value otherwise.
  70  */
  71 int tomoyo_write_group(struct tomoyo_acl_param *param, const u8 type)
  72 {
  73         struct tomoyo_group *group = tomoyo_get_group(param, type);
  74         int error = -EINVAL;
  75         if (!group)
  76                 return -ENOMEM;
  77         param->list = &group->member_list;
  78         if (type == TOMOYO_PATH_GROUP) {
  79                 struct tomoyo_path_group e = { };
  80                 e.member_name = tomoyo_get_name(tomoyo_read_token(param));
  81                 if (!e.member_name) {
  82                         error = -ENOMEM;
  83                         goto out;
  84                 }
  85                 error = tomoyo_update_policy(&e.head, sizeof(e), param,
  86                                           tomoyo_same_path_group);
  87                 tomoyo_put_name(e.member_name);
  88         } else if (type == TOMOYO_NUMBER_GROUP) {
  89                 struct tomoyo_number_group e = { };
  90                 if (param->data[0] == '@' ||
  91                     !tomoyo_parse_number_union(param, &e.number))
  92                         goto out;
  93                 error = tomoyo_update_policy(&e.head, sizeof(e), param,
  94                                           tomoyo_same_number_group);
  95                 /*
  96                  * tomoyo_put_number_union() is not needed because
  97                  * param->data[0] != '@'.
  98                  */
  99         } else {
 100                 struct tomoyo_address_group e = { };
 101
 102                 if (param->data[0] == '@' ||
 103                     !tomoyo_parse_ipaddr_union(param, &e.address))
 104                         goto out;
 105                 error = tomoyo_update_policy(&e.head, sizeof(e), param,
 106                                              tomoyo_same_address_group);
 107         }
 108 out:
 109         tomoyo_put_group(group);
 110         return error;
 111 }
 112
 113 /**
 114  * tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group.
 115  *
 116  * @pathname: The name of pathname.
 117  * @group:    Pointer to "struct tomoyo_path_group".
 118  *
 119  * Returns matched member's pathname if @pathname matches pathnames in @group,
 120  * NULL otherwise.
 121  *
 122  * Caller holds tomoyo_read_lock().
 123  */
 124 const struct tomoyo_path_info *
 125 tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
 126                           const struct tomoyo_group *group)
 127 {
 128         struct tomoyo_path_group *member;
 129         list_for_each_entry_rcu(member, &group->member_list, head.list) {
 130                 if (member->head.is_deleted)
 131                         continue;
 132                 if (!tomoyo_path_matches_pattern(pathname, member->member_name))
 133                         continue;
 134                 return member->member_name;
 135         }
 136         return NULL;
 137 }
 138
 139 /**
 140  * tomoyo_number_matches_group - Check whether the given number matches members of the given number group.
 141  *
 142  * @min:   Min number.
 143  * @max:   Max number.
 144  * @group: Pointer to "struct tomoyo_number_group".
 145  *
 146  * Returns true if @min and @max partially overlaps @group, false otherwise.
 147  *
 148  * Caller holds tomoyo_read_lock().
 149  */
 150 bool tomoyo_number_matches_group(const unsigned long min,
 151                                  const unsigned long max,
 152                                  const struct tomoyo_group *group)
 153 {
 154         struct tomoyo_number_group *member;
 155         bool matched = false;
 156         list_for_each_entry_rcu(member, &group->member_list, head.list) {
 157                 if (member->head.is_deleted)
 158                         continue;
 159                 if (min > member->number.values[1] ||
 160                     max < member->number.values[0])
 161                         continue;
 162                 matched = true;
 163                 break;
 164         }
 165         return matched;
 166 }
 167
 168 /**
 169  * tomoyo_address_matches_group - Check whether the given address matches members of the given address group.
 170  *
 171  * @is_ipv6: True if @address is an IPv6 address.
 172  * @address: An IPv4 or IPv6 address.
 173  * @group:   Pointer to "struct tomoyo_address_group".
 174  *
 175  * Returns true if @address matches addresses in @group group, false otherwise.
 176  *
 177  * Caller holds tomoyo_read_lock().
 178  */
 179 bool tomoyo_address_matches_group(const bool is_ipv6, const __be32 *address,
 180                                   const struct tomoyo_group *group)
 181 {
 182         struct tomoyo_address_group *member;
 183         bool matched = false;
 184         const u8 size = is_ipv6 ? 16 : 4;
 185
 186         list_for_each_entry_rcu(member, &group->member_list, head.list) {
 187                 if (member->head.is_deleted)
 188                         continue;
 189                 if (member->address.is_ipv6 != is_ipv6)
 190                         continue;
 191                 if (memcmp(&member->address.ip[0], address, size) > 0 ||
 192                     memcmp(address, &member->address.ip[1], size) > 0)
 193                         continue;
 194                 matched = true;
 195                 break;
 196         }
 197         return matched;
 198 }