security/tomoyo/group.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * security/tomoyo/group.c
0004  *
0005  * Copyright (C) 2005-2011  NTT DATA CORPORATION
0006  */
0007
0008 #include <linux/slab.h>
0009 #include <linux/rculist.h>
0010
0011 #include "common.h"
0012
0013 /**
0014  * tomoyo_same_path_group - Check for duplicated "struct tomoyo_path_group" entry.
0015  *
0016  * @a: Pointer to "struct tomoyo_acl_head".
0017  * @b: Pointer to "struct tomoyo_acl_head".
0018  *
0019  * Returns true if @a == @b, false otherwise.
0020  */
0021 static bool tomoyo_same_path_group(const struct tomoyo_acl_head *a,
0022                    const struct tomoyo_acl_head *b)
0023 {
0024     return container_of(a, struct tomoyo_path_group, head)->member_name ==
0025         container_of(b, struct tomoyo_path_group, head)->member_name;
0026 }
0027
0028 /**
0029  * tomoyo_same_number_group - Check for duplicated "struct tomoyo_number_group" entry.
0030  *
0031  * @a: Pointer to "struct tomoyo_acl_head".
0032  * @b: Pointer to "struct tomoyo_acl_head".
0033  *
0034  * Returns true if @a == @b, false otherwise.
0035  */
0036 static bool tomoyo_same_number_group(const struct tomoyo_acl_head *a,
0037                      const struct tomoyo_acl_head *b)
0038 {
0039     return !memcmp(&container_of(a, struct tomoyo_number_group, head)
0040                ->number,
0041                &container_of(b, struct tomoyo_number_group, head)
0042                ->number,
0043                sizeof(container_of(a, struct tomoyo_number_group, head)
0044                   ->number));
0045 }
0046
0047 /**
0048  * tomoyo_same_address_group - Check for duplicated "struct tomoyo_address_group" entry.
0049  *
0050  * @a: Pointer to "struct tomoyo_acl_head".
0051  * @b: Pointer to "struct tomoyo_acl_head".
0052  *
0053  * Returns true if @a == @b, false otherwise.
0054  */
0055 static bool tomoyo_same_address_group(const struct tomoyo_acl_head *a,
0056                       const struct tomoyo_acl_head *b)
0057 {
0058     const struct tomoyo_address_group *p1 = container_of(a, typeof(*p1),
0059                                  head);
0060     const struct tomoyo_address_group *p2 = container_of(b, typeof(*p2),
0061                                  head);
0062
0063     return tomoyo_same_ipaddr_union(&p1->address, &p2->address);
0064 }
0065
0066 /**
0067  * tomoyo_write_group - Write "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
0068  *
0069  * @param: Pointer to "struct tomoyo_acl_param".
0070  * @type:  Type of this group.
0071  *
0072  * Returns 0 on success, negative value otherwise.
0073  */
0074 int tomoyo_write_group(struct tomoyo_acl_param *param, const u8 type)
0075 {
0076     struct tomoyo_group *group = tomoyo_get_group(param, type);
0077     int error = -EINVAL;
0078
0079     if (!group)
0080         return -ENOMEM;
0081     param->list = &group->member_list;
0082     if (type == TOMOYO_PATH_GROUP) {
0083         struct tomoyo_path_group e = { };
0084
0085         e.member_name = tomoyo_get_name(tomoyo_read_token(param));
0086         if (!e.member_name) {
0087             error = -ENOMEM;
0088             goto out;
0089         }
0090         error = tomoyo_update_policy(&e.head, sizeof(e), param,
0091                       tomoyo_same_path_group);
0092         tomoyo_put_name(e.member_name);
0093     } else if (type == TOMOYO_NUMBER_GROUP) {
0094         struct tomoyo_number_group e = { };
0095
0096         if (param->data[0] == '@' ||
0097             !tomoyo_parse_number_union(param, &e.number))
0098             goto out;
0099         error = tomoyo_update_policy(&e.head, sizeof(e), param,
0100                       tomoyo_same_number_group);
0101         /*
0102          * tomoyo_put_number_union() is not needed because
0103          * param->data[0] != '@'.
0104          */
0105     } else {
0106         struct tomoyo_address_group e = { };
0107
0108         if (param->data[0] == '@' ||
0109             !tomoyo_parse_ipaddr_union(param, &e.address))
0110             goto out;
0111         error = tomoyo_update_policy(&e.head, sizeof(e), param,
0112                          tomoyo_same_address_group);
0113     }
0114 out:
0115     tomoyo_put_group(group);
0116     return error;
0117 }
0118
0119 /**
0120  * tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group.
0121  *
0122  * @pathname: The name of pathname.
0123  * @group:    Pointer to "struct tomoyo_path_group".
0124  *
0125  * Returns matched member's pathname if @pathname matches pathnames in @group,
0126  * NULL otherwise.
0127  *
0128  * Caller holds tomoyo_read_lock().
0129  */
0130 const struct tomoyo_path_info *
0131 tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
0132               const struct tomoyo_group *group)
0133 {
0134     struct tomoyo_path_group *member;
0135
0136     list_for_each_entry_rcu(member, &group->member_list, head.list,
0137                 srcu_read_lock_held(&tomoyo_ss)) {
0138         if (member->head.is_deleted)
0139             continue;
0140         if (!tomoyo_path_matches_pattern(pathname, member->member_name))
0141             continue;
0142         return member->member_name;
0143     }
0144     return NULL;
0145 }
0146
0147 /**
0148  * tomoyo_number_matches_group - Check whether the given number matches members of the given number group.
0149  *
0150  * @min:   Min number.
0151  * @max:   Max number.
0152  * @group: Pointer to "struct tomoyo_number_group".
0153  *
0154  * Returns true if @min and @max partially overlaps @group, false otherwise.
0155  *
0156  * Caller holds tomoyo_read_lock().
0157  */
0158 bool tomoyo_number_matches_group(const unsigned long min,
0159                  const unsigned long max,
0160                  const struct tomoyo_group *group)
0161 {
0162     struct tomoyo_number_group *member;
0163     bool matched = false;
0164
0165     list_for_each_entry_rcu(member, &group->member_list, head.list,
0166                 srcu_read_lock_held(&tomoyo_ss)) {
0167         if (member->head.is_deleted)
0168             continue;
0169         if (min > member->number.values[1] ||
0170             max < member->number.values[0])
0171             continue;
0172         matched = true;
0173         break;
0174     }
0175     return matched;
0176 }
0177
0178 /**
0179  * tomoyo_address_matches_group - Check whether the given address matches members of the given address group.
0180  *
0181  * @is_ipv6: True if @address is an IPv6 address.
0182  * @address: An IPv4 or IPv6 address.
0183  * @group:   Pointer to "struct tomoyo_address_group".
0184  *
0185  * Returns true if @address matches addresses in @group group, false otherwise.
0186  *
0187  * Caller holds tomoyo_read_lock().
0188  */
0189 bool tomoyo_address_matches_group(const bool is_ipv6, const __be32 *address,
0190                   const struct tomoyo_group *group)
0191 {
0192     struct tomoyo_address_group *member;
0193     bool matched = false;
0194     const u8 size = is_ipv6 ? 16 : 4;
0195
0196     list_for_each_entry_rcu(member, &group->member_list, head.list,
0197                 srcu_read_lock_held(&tomoyo_ss)) {
0198         if (member->head.is_deleted)
0199             continue;
0200         if (member->address.is_ipv6 != is_ipv6)
0201             continue;
0202         if (memcmp(&member->address.ip[0], address, size) > 0 ||
0203             memcmp(address, &member->address.ip[1], size) > 0)
0204             continue;
0205         matched = true;
0206         break;
0207     }
0208     return matched;
0209 }