security/tomoyo/group.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * security/tomoyo/group.c
   4  *
   5  * Copyright (C) 2005-2011  NTT DATA CORPORATION
   6  */
   7
   8 #include <linux/slab.h>
   9 #include <linux/rculist.h>
  10
  11 #include "common.h"
  12
  13 /**
  14  * tomoyo_same_path_group - Check for duplicated "struct tomoyo_path_group" entry.
  15  *
  16  * @a: Pointer to "struct tomoyo_acl_head".
  17  * @b: Pointer to "struct tomoyo_acl_head".
  18  *
  19  * Returns true if @a == @b, false otherwise.
  20  */
  21 static bool tomoyo_same_path_group(const struct tomoyo_acl_head *a,
  22                                    const struct tomoyo_acl_head *b)
  23 {
  24         return container_of(a, struct tomoyo_path_group, head)->member_name ==
  25                 container_of(b, struct tomoyo_path_group, head)->member_name;
  26 }
  27
  28 /**
  29  * tomoyo_same_number_group - Check for duplicated "struct tomoyo_number_group" entry.
  30  *
  31  * @a: Pointer to "struct tomoyo_acl_head".
  32  * @b: Pointer to "struct tomoyo_acl_head".
  33  *
  34  * Returns true if @a == @b, false otherwise.
  35  */
  36 static bool tomoyo_same_number_group(const struct tomoyo_acl_head *a,
  37                                      const struct tomoyo_acl_head *b)
  38 {
  39         return !memcmp(&container_of(a, struct tomoyo_number_group, head)
  40                        ->number,
  41                        &container_of(b, struct tomoyo_number_group, head)
  42                        ->number,
  43                        sizeof(container_of(a, struct tomoyo_number_group, head)
  44                               ->number));
  45 }
  46
  47 /**
  48  * tomoyo_same_address_group - Check for duplicated "struct tomoyo_address_group" entry.
  49  *
  50  * @a: Pointer to "struct tomoyo_acl_head".
  51  * @b: Pointer to "struct tomoyo_acl_head".
  52  *
  53  * Returns true if @a == @b, false otherwise.
  54  */
  55 static bool tomoyo_same_address_group(const struct tomoyo_acl_head *a,
  56                                       const struct tomoyo_acl_head *b)
  57 {
  58         const struct tomoyo_address_group *p1 = container_of(a, typeof(*p1),
  59                                                              head);
  60         const struct tomoyo_address_group *p2 = container_of(b, typeof(*p2),
  61                                                              head);
  62
  63         return tomoyo_same_ipaddr_union(&p1->address, &p2->address);
  64 }
  65
  66 /**
  67  * tomoyo_write_group - Write "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
  68  *
  69  * @param: Pointer to "struct tomoyo_acl_param".
  70  * @type:  Type of this group.
  71  *
  72  * Returns 0 on success, negative value otherwise.
  73  */
  74 int tomoyo_write_group(struct tomoyo_acl_param *param, const u8 type)
  75 {
  76         struct tomoyo_group *group = tomoyo_get_group(param, type);
  77         int error = -EINVAL;
  78
  79         if (!group)
  80                 return -ENOMEM;
  81         param->list = &group->member_list;
  82         if (type == TOMOYO_PATH_GROUP) {
  83                 struct tomoyo_path_group e = { };
  84
  85                 e.member_name = tomoyo_get_name(tomoyo_read_token(param));
  86                 if (!e.member_name) {
  87                         error = -ENOMEM;
  88                         goto out;
  89                 }
  90                 error = tomoyo_update_policy(&e.head, sizeof(e), param,
  91                                           tomoyo_same_path_group);
  92                 tomoyo_put_name(e.member_name);
  93         } else if (type == TOMOYO_NUMBER_GROUP) {
  94                 struct tomoyo_number_group e = { };
  95
  96                 if (param->data[0] == '@' ||
  97                     !tomoyo_parse_number_union(param, &e.number))
  98                         goto out;
  99                 error = tomoyo_update_policy(&e.head, sizeof(e), param,
 100                                           tomoyo_same_number_group);
 101                 /*
 102                  * tomoyo_put_number_union() is not needed because
 103                  * param->data[0] != '@'.
 104                  */
 105         } else {
 106                 struct tomoyo_address_group e = { };
 107
 108                 if (param->data[0] == '@' ||
 109                     !tomoyo_parse_ipaddr_union(param, &e.address))
 110                         goto out;
 111                 error = tomoyo_update_policy(&e.head, sizeof(e), param,
 112                                              tomoyo_same_address_group);
 113         }
 114 out:
 115         tomoyo_put_group(group);
 116         return error;
 117 }
 118
 119 /**
 120  * tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group.
 121  *
 122  * @pathname: The name of pathname.
 123  * @group:    Pointer to "struct tomoyo_path_group".
 124  *
 125  * Returns matched member's pathname if @pathname matches pathnames in @group,
 126  * NULL otherwise.
 127  *
 128  * Caller holds tomoyo_read_lock().
 129  */
 130 const struct tomoyo_path_info *
 131 tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
 132                           const struct tomoyo_group *group)
 133 {
 134         struct tomoyo_path_group *member;
 135
 136         list_for_each_entry_rcu(member, &group->member_list, head.list,
 137                                 srcu_read_lock_held(&tomoyo_ss)) {
 138                 if (member->head.is_deleted)
 139                         continue;
 140                 if (!tomoyo_path_matches_pattern(pathname, member->member_name))
 141                         continue;
 142                 return member->member_name;
 143         }
 144         return NULL;
 145 }
 146
 147 /**
 148  * tomoyo_number_matches_group - Check whether the given number matches members of the given number group.
 149  *
 150  * @min:   Min number.
 151  * @max:   Max number.
 152  * @group: Pointer to "struct tomoyo_number_group".
 153  *
 154  * Returns true if @min and @max partially overlaps @group, false otherwise.
 155  *
 156  * Caller holds tomoyo_read_lock().
 157  */
 158 bool tomoyo_number_matches_group(const unsigned long min,
 159                                  const unsigned long max,
 160                                  const struct tomoyo_group *group)
 161 {
 162         struct tomoyo_number_group *member;
 163         bool matched = false;
 164
 165         list_for_each_entry_rcu(member, &group->member_list, head.list,
 166                                 srcu_read_lock_held(&tomoyo_ss)) {
 167                 if (member->head.is_deleted)
 168                         continue;
 169                 if (min > member->number.values[1] ||
 170                     max < member->number.values[0])
 171                         continue;
 172                 matched = true;
 173                 break;
 174         }
 175         return matched;
 176 }
 177
 178 /**
 179  * tomoyo_address_matches_group - Check whether the given address matches members of the given address group.
 180  *
 181  * @is_ipv6: True if @address is an IPv6 address.
 182  * @address: An IPv4 or IPv6 address.
 183  * @group:   Pointer to "struct tomoyo_address_group".
 184  *
 185  * Returns true if @address matches addresses in @group group, false otherwise.
 186  *
 187  * Caller holds tomoyo_read_lock().
 188  */
 189 bool tomoyo_address_matches_group(const bool is_ipv6, const __be32 *address,
 190                                   const struct tomoyo_group *group)
 191 {
 192         struct tomoyo_address_group *member;
 193         bool matched = false;
 194         const u8 size = is_ipv6 ? 16 : 4;
 195
 196         list_for_each_entry_rcu(member, &group->member_list, head.list,
 197                                 srcu_read_lock_held(&tomoyo_ss)) {
 198                 if (member->head.is_deleted)
 199                         continue;
 200                 if (member->address.is_ipv6 != is_ipv6)
 201                         continue;
 202                 if (memcmp(&member->address.ip[0], address, size) > 0 ||
 203                     memcmp(address, &member->address.ip[1], size) > 0)
 204                         continue;
 205                 matched = true;
 206                 break;
 207         }
 208         return matched;
 209 }