group.c

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/*
 * security/tomoyo/group.c
 *
 * Copyright (C) 2005-2011  NTT DATA CORPORATION
 */

#include <linux/slab.h>
#include "common.h"

static bool tomoyo_same_path_group(const struct tomoyo_acl_head *a,
                   const struct tomoyo_acl_head *b)
{
    return container_of(a, struct tomoyo_path_group, head)->member_name ==
        container_of(b, struct tomoyo_path_group, head)->member_name;
}

static bool tomoyo_same_number_group(const struct tomoyo_acl_head *a,
                     const struct tomoyo_acl_head *b)
{
    return !memcmp(&container_of(a, struct tomoyo_number_group, head)
               ->number,
               &container_of(b, struct tomoyo_number_group, head)
               ->number,
               sizeof(container_of(a, struct tomoyo_number_group, head)
                  ->number));
}

static bool tomoyo_same_address_group(const struct tomoyo_acl_head *a,
                      const struct tomoyo_acl_head *b)
{
    const struct tomoyo_address_group *p1 = container_of(a, typeof(*p1),
                                 head);
    const struct tomoyo_address_group *p2 = container_of(b, typeof(*p2),
                                 head);

    return tomoyo_same_ipaddr_union(&p1->address, &p2->address);
}

int tomoyo_write_group(struct tomoyo_acl_param *param, const u8 type)
{
    struct tomoyo_group *group = tomoyo_get_group(param, type);
    int error = -EINVAL;
    if (!group)
        return -ENOMEM;
    param->list = &group->member_list;
    if (type == TOMOYO_PATH_GROUP) {
        struct tomoyo_path_group e = { };
        e.member_name = tomoyo_get_name(tomoyo_read_token(param));
        if (!e.member_name) {
            error = -ENOMEM;
            goto out;
        }
        error = tomoyo_update_policy(&e.head, sizeof(e), param,
                      tomoyo_same_path_group);
        tomoyo_put_name(e.member_name);
    } else if (type == TOMOYO_NUMBER_GROUP) {
        struct tomoyo_number_group e = { };
        if (param->data[0] == '@' ||
            !tomoyo_parse_number_union(param, &e.number))
            goto out;
        error = tomoyo_update_policy(&e.head, sizeof(e), param,
                      tomoyo_same_number_group);
        /*
         * tomoyo_put_number_union() is not needed because
         * param->data[0] != '@'.
         */
    } else {
        struct tomoyo_address_group e = { };

        if (param->data[0] == '@' ||
            !tomoyo_parse_ipaddr_union(param, &e.address))
            goto out;
        error = tomoyo_update_policy(&e.head, sizeof(e), param,
                         tomoyo_same_address_group);
    }
out:
    tomoyo_put_group(group);
    return error;
}

const struct tomoyo_path_info *
tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
              const struct tomoyo_group *group)
{
    struct tomoyo_path_group *member;
    list_for_each_entry_rcu(member, &group->member_list, head.list) {
        if (member->head.is_deleted)
            continue;
        if (!tomoyo_path_matches_pattern(pathname, member->member_name))
            continue;
        return member->member_name;
    }
    return NULL;
}

bool tomoyo_number_matches_group(const unsigned long min,
                 const unsigned long max,
                 const struct tomoyo_group *group)
{
    struct tomoyo_number_group *member;
    bool matched = false;
    list_for_each_entry_rcu(member, &group->member_list, head.list) {
        if (member->head.is_deleted)
            continue;
        if (min > member->number.values[1] ||
            max < member->number.values[0])
            continue;
        matched = true;
        break;
    }
    return matched;
}

bool tomoyo_address_matches_group(const bool is_ipv6, const __be32 *address,
                  const struct tomoyo_group *group)
{
    struct tomoyo_address_group *member;
    bool matched = false;
    const u8 size = is_ipv6 ? 16 : 4;

    list_for_each_entry_rcu(member, &group->member_list, head.list) {
        if (member->head.is_deleted)
            continue;
        if (member->address.is_ipv6 != is_ipv6)
            continue;
        if (memcmp(&member->address.ip[0], address, size) > 0 ||
            memcmp(address, &member->address.ip[1], size) > 0)
            continue;
        matched = true;
        break;
    }
    return matched;
}