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         if (!group)
  79                 return -ENOMEM;
  80         param->list = &group->member_list;
  81         if (type == TOMOYO_PATH_GROUP) {
  82                 struct tomoyo_path_group e = { };
  83                 e.member_name = tomoyo_get_name(tomoyo_read_token(param));
  84                 if (!e.member_name) {
  85                         error = -ENOMEM;
  86                         goto out;
  87                 }
  88                 error = tomoyo_update_policy(&e.head, sizeof(e), param,
  89                                           tomoyo_same_path_group);
  90                 tomoyo_put_name(e.member_name);
  91         } else if (type == TOMOYO_NUMBER_GROUP) {
  92                 struct tomoyo_number_group e = { };
  93                 if (param->data[0] == '@' ||
  94                     !tomoyo_parse_number_union(param, &e.number))
  95                         goto out;
  96                 error = tomoyo_update_policy(&e.head, sizeof(e), param,
  97                                           tomoyo_same_number_group);
  98                 /*
  99                  * tomoyo_put_number_union() is not needed because
 100                  * param->data[0] != '@'.
 101                  */
 102         } else {
 103                 struct tomoyo_address_group e = { };
 104
 105                 if (param->data[0] == '@' ||
 106                     !tomoyo_parse_ipaddr_union(param, &e.address))
 107                         goto out;
 108                 error = tomoyo_update_policy(&e.head, sizeof(e), param,
 109                                              tomoyo_same_address_group);
 110         }
 111 out:
 112         tomoyo_put_group(group);
 113         return error;
 114 }
 115
 116 /**
 117  * tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group.
 118  *
 119  * @pathname: The name of pathname.
 120  * @group:    Pointer to "struct tomoyo_path_group".
 121  *
 122  * Returns matched member's pathname if @pathname matches pathnames in @group,
 123  * NULL otherwise.
 124  *
 125  * Caller holds tomoyo_read_lock().
 126  */
 127 const struct tomoyo_path_info *
 128 tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
 129                           const struct tomoyo_group *group)
 130 {
 131         struct tomoyo_path_group *member;
 132         list_for_each_entry_rcu(member, &group->member_list, head.list) {
 133                 if (member->head.is_deleted)
 134                         continue;
 135                 if (!tomoyo_path_matches_pattern(pathname, member->member_name))
 136                         continue;
 137                 return member->member_name;
 138         }
 139         return NULL;
 140 }
 141
 142 /**
 143  * tomoyo_number_matches_group - Check whether the given number matches members of the given number group.
 144  *
 145  * @min:   Min number.
 146  * @max:   Max number.
 147  * @group: Pointer to "struct tomoyo_number_group".
 148  *
 149  * Returns true if @min and @max partially overlaps @group, false otherwise.
 150  *
 151  * Caller holds tomoyo_read_lock().
 152  */
 153 bool tomoyo_number_matches_group(const unsigned long min,
 154                                  const unsigned long max,
 155                                  const struct tomoyo_group *group)
 156 {
 157         struct tomoyo_number_group *member;
 158         bool matched = false;
 159         list_for_each_entry_rcu(member, &group->member_list, head.list) {
 160                 if (member->head.is_deleted)
 161                         continue;
 162                 if (min > member->number.values[1] ||
 163                     max < member->number.values[0])
 164                         continue;
 165                 matched = true;
 166                 break;
 167         }
 168         return matched;
 169 }
 170
 171 /**
 172  * tomoyo_address_matches_group - Check whether the given address matches members of the given address group.
 173  *
 174  * @is_ipv6: True if @address is an IPv6 address.
 175  * @address: An IPv4 or IPv6 address.
 176  * @group:   Pointer to "struct tomoyo_address_group".
 177  *
 178  * Returns true if @address matches addresses in @group group, false otherwise.
 179  *
 180  * Caller holds tomoyo_read_lock().
 181  */
 182 bool tomoyo_address_matches_group(const bool is_ipv6, const __be32 *address,
 183                                   const struct tomoyo_group *group)
 184 {
 185         struct tomoyo_address_group *member;
 186         bool matched = false;
 187         const u8 size = is_ipv6 ? 16 : 4;
 188
 189         list_for_each_entry_rcu(member, &group->member_list, head.list) {
 190                 if (member->head.is_deleted)
 191                         continue;
 192                 if (member->address.is_ipv6 != is_ipv6)
 193                         continue;
 194                 if (memcmp(&member->address.ip[0], address, size) > 0 ||
 195                     memcmp(address, &member->address.ip[1], size) > 0)
 196                         continue;
 197                 matched = true;
 198                 break;
 199         }
 200         return matched;
 201 }