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TOMOYO Linux Cross Reference
Linux/security/tomoyo/group.c

Version: ~ [ linux-5.4-rc3 ] ~ [ linux-5.3.6 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.79 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.149 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.196 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.196 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.75 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 }
202 

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