// SPDX-License-Identifier: GPL-2.0
|
/*
|
* security/tomoyo/network.c
|
*
|
* Copyright (C) 2005-2011 NTT DATA CORPORATION
|
*/
|
|
#include "common.h"
|
#include <linux/slab.h>
|
|
/* Structure for holding inet domain socket's address. */
|
struct tomoyo_inet_addr_info {
|
__be16 port; /* In network byte order. */
|
const __be32 *address; /* In network byte order. */
|
bool is_ipv6;
|
};
|
|
/* Structure for holding unix domain socket's address. */
|
struct tomoyo_unix_addr_info {
|
u8 *addr; /* This may not be '\0' terminated string. */
|
unsigned int addr_len;
|
};
|
|
/* Structure for holding socket address. */
|
struct tomoyo_addr_info {
|
u8 protocol;
|
u8 operation;
|
struct tomoyo_inet_addr_info inet;
|
struct tomoyo_unix_addr_info unix0;
|
};
|
|
/* String table for socket's protocols. */
|
const char * const tomoyo_proto_keyword[TOMOYO_SOCK_MAX] = {
|
[SOCK_STREAM] = "stream",
|
[SOCK_DGRAM] = "dgram",
|
[SOCK_RAW] = "raw",
|
[SOCK_SEQPACKET] = "seqpacket",
|
[0] = " ", /* Dummy for avoiding NULL pointer dereference. */
|
[4] = " ", /* Dummy for avoiding NULL pointer dereference. */
|
};
|
|
/**
|
* tomoyo_parse_ipaddr_union - Parse an IP address.
|
*
|
* @param: Pointer to "struct tomoyo_acl_param".
|
* @ptr: Pointer to "struct tomoyo_ipaddr_union".
|
*
|
* Returns true on success, false otherwise.
|
*/
|
bool tomoyo_parse_ipaddr_union(struct tomoyo_acl_param *param,
|
struct tomoyo_ipaddr_union *ptr)
|
{
|
u8 * const min = ptr->ip[0].in6_u.u6_addr8;
|
u8 * const max = ptr->ip[1].in6_u.u6_addr8;
|
char *address = tomoyo_read_token(param);
|
const char *end;
|
|
if (!strchr(address, ':') &&
|
in4_pton(address, -1, min, '-', &end) > 0) {
|
ptr->is_ipv6 = false;
|
if (!*end)
|
ptr->ip[1].s6_addr32[0] = ptr->ip[0].s6_addr32[0];
|
else if (*end++ != '-' ||
|
in4_pton(end, -1, max, '\0', &end) <= 0 || *end)
|
return false;
|
return true;
|
}
|
if (in6_pton(address, -1, min, '-', &end) > 0) {
|
ptr->is_ipv6 = true;
|
if (!*end)
|
memmove(max, min, sizeof(u16) * 8);
|
else if (*end++ != '-' ||
|
in6_pton(end, -1, max, '\0', &end) <= 0 || *end)
|
return false;
|
return true;
|
}
|
return false;
|
}
|
|
/**
|
* tomoyo_print_ipv4 - Print an IPv4 address.
|
*
|
* @buffer: Buffer to write to.
|
* @buffer_len: Size of @buffer.
|
* @min_ip: Pointer to __be32.
|
* @max_ip: Pointer to __be32.
|
*
|
* Returns nothing.
|
*/
|
static void tomoyo_print_ipv4(char *buffer, const unsigned int buffer_len,
|
const __be32 *min_ip, const __be32 *max_ip)
|
{
|
snprintf(buffer, buffer_len, "%pI4%c%pI4", min_ip,
|
*min_ip == *max_ip ? '\0' : '-', max_ip);
|
}
|
|
/**
|
* tomoyo_print_ipv6 - Print an IPv6 address.
|
*
|
* @buffer: Buffer to write to.
|
* @buffer_len: Size of @buffer.
|
* @min_ip: Pointer to "struct in6_addr".
|
* @max_ip: Pointer to "struct in6_addr".
|
*
|
* Returns nothing.
|
*/
|
static void tomoyo_print_ipv6(char *buffer, const unsigned int buffer_len,
|
const struct in6_addr *min_ip,
|
const struct in6_addr *max_ip)
|
{
|
snprintf(buffer, buffer_len, "%pI6c%c%pI6c", min_ip,
|
!memcmp(min_ip, max_ip, 16) ? '\0' : '-', max_ip);
|
}
|
|
/**
|
* tomoyo_print_ip - Print an IP address.
|
*
|
* @buf: Buffer to write to.
|
* @size: Size of @buf.
|
* @ptr: Pointer to "struct ipaddr_union".
|
*
|
* Returns nothing.
|
*/
|
void tomoyo_print_ip(char *buf, const unsigned int size,
|
const struct tomoyo_ipaddr_union *ptr)
|
{
|
if (ptr->is_ipv6)
|
tomoyo_print_ipv6(buf, size, &ptr->ip[0], &ptr->ip[1]);
|
else
|
tomoyo_print_ipv4(buf, size, &ptr->ip[0].s6_addr32[0],
|
&ptr->ip[1].s6_addr32[0]);
|
}
|
|
/*
|
* Mapping table from "enum tomoyo_network_acl_index" to
|
* "enum tomoyo_mac_index" for inet domain socket.
|
*/
|
static const u8 tomoyo_inet2mac
|
[TOMOYO_SOCK_MAX][TOMOYO_MAX_NETWORK_OPERATION] = {
|
[SOCK_STREAM] = {
|
[TOMOYO_NETWORK_BIND] = TOMOYO_MAC_NETWORK_INET_STREAM_BIND,
|
[TOMOYO_NETWORK_LISTEN] =
|
TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN,
|
[TOMOYO_NETWORK_CONNECT] =
|
TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT,
|
},
|
[SOCK_DGRAM] = {
|
[TOMOYO_NETWORK_BIND] = TOMOYO_MAC_NETWORK_INET_DGRAM_BIND,
|
[TOMOYO_NETWORK_SEND] = TOMOYO_MAC_NETWORK_INET_DGRAM_SEND,
|
},
|
[SOCK_RAW] = {
|
[TOMOYO_NETWORK_BIND] = TOMOYO_MAC_NETWORK_INET_RAW_BIND,
|
[TOMOYO_NETWORK_SEND] = TOMOYO_MAC_NETWORK_INET_RAW_SEND,
|
},
|
};
|
|
/*
|
* Mapping table from "enum tomoyo_network_acl_index" to
|
* "enum tomoyo_mac_index" for unix domain socket.
|
*/
|
static const u8 tomoyo_unix2mac
|
[TOMOYO_SOCK_MAX][TOMOYO_MAX_NETWORK_OPERATION] = {
|
[SOCK_STREAM] = {
|
[TOMOYO_NETWORK_BIND] = TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND,
|
[TOMOYO_NETWORK_LISTEN] =
|
TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN,
|
[TOMOYO_NETWORK_CONNECT] =
|
TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT,
|
},
|
[SOCK_DGRAM] = {
|
[TOMOYO_NETWORK_BIND] = TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND,
|
[TOMOYO_NETWORK_SEND] = TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND,
|
},
|
[SOCK_SEQPACKET] = {
|
[TOMOYO_NETWORK_BIND] =
|
TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND,
|
[TOMOYO_NETWORK_LISTEN] =
|
TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN,
|
[TOMOYO_NETWORK_CONNECT] =
|
TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT,
|
},
|
};
|
|
/**
|
* tomoyo_same_inet_acl - Check for duplicated "struct tomoyo_inet_acl" entry.
|
*
|
* @a: Pointer to "struct tomoyo_acl_info".
|
* @b: Pointer to "struct tomoyo_acl_info".
|
*
|
* Returns true if @a == @b except permission bits, false otherwise.
|
*/
|
static bool tomoyo_same_inet_acl(const struct tomoyo_acl_info *a,
|
const struct tomoyo_acl_info *b)
|
{
|
const struct tomoyo_inet_acl *p1 = container_of(a, typeof(*p1), head);
|
const struct tomoyo_inet_acl *p2 = container_of(b, typeof(*p2), head);
|
|
return p1->protocol == p2->protocol &&
|
tomoyo_same_ipaddr_union(&p1->address, &p2->address) &&
|
tomoyo_same_number_union(&p1->port, &p2->port);
|
}
|
|
/**
|
* tomoyo_same_unix_acl - Check for duplicated "struct tomoyo_unix_acl" entry.
|
*
|
* @a: Pointer to "struct tomoyo_acl_info".
|
* @b: Pointer to "struct tomoyo_acl_info".
|
*
|
* Returns true if @a == @b except permission bits, false otherwise.
|
*/
|
static bool tomoyo_same_unix_acl(const struct tomoyo_acl_info *a,
|
const struct tomoyo_acl_info *b)
|
{
|
const struct tomoyo_unix_acl *p1 = container_of(a, typeof(*p1), head);
|
const struct tomoyo_unix_acl *p2 = container_of(b, typeof(*p2), head);
|
|
return p1->protocol == p2->protocol &&
|
tomoyo_same_name_union(&p1->name, &p2->name);
|
}
|
|
/**
|
* tomoyo_merge_inet_acl - Merge duplicated "struct tomoyo_inet_acl" entry.
|
*
|
* @a: Pointer to "struct tomoyo_acl_info".
|
* @b: Pointer to "struct tomoyo_acl_info".
|
* @is_delete: True for @a &= ~@b, false for @a |= @b.
|
*
|
* Returns true if @a is empty, false otherwise.
|
*/
|
static bool tomoyo_merge_inet_acl(struct tomoyo_acl_info *a,
|
struct tomoyo_acl_info *b,
|
const bool is_delete)
|
{
|
u8 * const a_perm =
|
&container_of(a, struct tomoyo_inet_acl, head)->perm;
|
u8 perm = READ_ONCE(*a_perm);
|
const u8 b_perm = container_of(b, struct tomoyo_inet_acl, head)->perm;
|
|
if (is_delete)
|
perm &= ~b_perm;
|
else
|
perm |= b_perm;
|
WRITE_ONCE(*a_perm, perm);
|
return !perm;
|
}
|
|
/**
|
* tomoyo_merge_unix_acl - Merge duplicated "struct tomoyo_unix_acl" entry.
|
*
|
* @a: Pointer to "struct tomoyo_acl_info".
|
* @b: Pointer to "struct tomoyo_acl_info".
|
* @is_delete: True for @a &= ~@b, false for @a |= @b.
|
*
|
* Returns true if @a is empty, false otherwise.
|
*/
|
static bool tomoyo_merge_unix_acl(struct tomoyo_acl_info *a,
|
struct tomoyo_acl_info *b,
|
const bool is_delete)
|
{
|
u8 * const a_perm =
|
&container_of(a, struct tomoyo_unix_acl, head)->perm;
|
u8 perm = READ_ONCE(*a_perm);
|
const u8 b_perm = container_of(b, struct tomoyo_unix_acl, head)->perm;
|
|
if (is_delete)
|
perm &= ~b_perm;
|
else
|
perm |= b_perm;
|
WRITE_ONCE(*a_perm, perm);
|
return !perm;
|
}
|
|
/**
|
* tomoyo_write_inet_network - Write "struct tomoyo_inet_acl" list.
|
*
|
* @param: Pointer to "struct tomoyo_acl_param".
|
*
|
* Returns 0 on success, negative value otherwise.
|
*
|
* Caller holds tomoyo_read_lock().
|
*/
|
int tomoyo_write_inet_network(struct tomoyo_acl_param *param)
|
{
|
struct tomoyo_inet_acl e = { .head.type = TOMOYO_TYPE_INET_ACL };
|
int error = -EINVAL;
|
u8 type;
|
const char *protocol = tomoyo_read_token(param);
|
const char *operation = tomoyo_read_token(param);
|
|
for (e.protocol = 0; e.protocol < TOMOYO_SOCK_MAX; e.protocol++)
|
if (!strcmp(protocol, tomoyo_proto_keyword[e.protocol]))
|
break;
|
for (type = 0; type < TOMOYO_MAX_NETWORK_OPERATION; type++)
|
if (tomoyo_permstr(operation, tomoyo_socket_keyword[type]))
|
e.perm |= 1 << type;
|
if (e.protocol == TOMOYO_SOCK_MAX || !e.perm)
|
return -EINVAL;
|
if (param->data[0] == '@') {
|
param->data++;
|
e.address.group =
|
tomoyo_get_group(param, TOMOYO_ADDRESS_GROUP);
|
if (!e.address.group)
|
return -ENOMEM;
|
} else {
|
if (!tomoyo_parse_ipaddr_union(param, &e.address))
|
goto out;
|
}
|
if (!tomoyo_parse_number_union(param, &e.port) ||
|
e.port.values[1] > 65535)
|
goto out;
|
error = tomoyo_update_domain(&e.head, sizeof(e), param,
|
tomoyo_same_inet_acl,
|
tomoyo_merge_inet_acl);
|
out:
|
tomoyo_put_group(e.address.group);
|
tomoyo_put_number_union(&e.port);
|
return error;
|
}
|
|
/**
|
* tomoyo_write_unix_network - Write "struct tomoyo_unix_acl" list.
|
*
|
* @param: Pointer to "struct tomoyo_acl_param".
|
*
|
* Returns 0 on success, negative value otherwise.
|
*/
|
int tomoyo_write_unix_network(struct tomoyo_acl_param *param)
|
{
|
struct tomoyo_unix_acl e = { .head.type = TOMOYO_TYPE_UNIX_ACL };
|
int error;
|
u8 type;
|
const char *protocol = tomoyo_read_token(param);
|
const char *operation = tomoyo_read_token(param);
|
|
for (e.protocol = 0; e.protocol < TOMOYO_SOCK_MAX; e.protocol++)
|
if (!strcmp(protocol, tomoyo_proto_keyword[e.protocol]))
|
break;
|
for (type = 0; type < TOMOYO_MAX_NETWORK_OPERATION; type++)
|
if (tomoyo_permstr(operation, tomoyo_socket_keyword[type]))
|
e.perm |= 1 << type;
|
if (e.protocol == TOMOYO_SOCK_MAX || !e.perm)
|
return -EINVAL;
|
if (!tomoyo_parse_name_union(param, &e.name))
|
return -EINVAL;
|
error = tomoyo_update_domain(&e.head, sizeof(e), param,
|
tomoyo_same_unix_acl,
|
tomoyo_merge_unix_acl);
|
tomoyo_put_name_union(&e.name);
|
return error;
|
}
|
|
/**
|
* tomoyo_audit_net_log - Audit network log.
|
*
|
* @r: Pointer to "struct tomoyo_request_info".
|
* @family: Name of socket family ("inet" or "unix").
|
* @protocol: Name of protocol in @family.
|
* @operation: Name of socket operation.
|
* @address: Name of address.
|
*
|
* Returns 0 on success, negative value otherwise.
|
*/
|
static int tomoyo_audit_net_log(struct tomoyo_request_info *r,
|
const char *family, const u8 protocol,
|
const u8 operation, const char *address)
|
{
|
return tomoyo_supervisor(r, "network %s %s %s %s\n", family,
|
tomoyo_proto_keyword[protocol],
|
tomoyo_socket_keyword[operation], address);
|
}
|
|
/**
|
* tomoyo_audit_inet_log - Audit INET network log.
|
*
|
* @r: Pointer to "struct tomoyo_request_info".
|
*
|
* Returns 0 on success, negative value otherwise.
|
*/
|
static int tomoyo_audit_inet_log(struct tomoyo_request_info *r)
|
{
|
char buf[128];
|
int len;
|
const __be32 *address = r->param.inet_network.address;
|
|
if (r->param.inet_network.is_ipv6)
|
tomoyo_print_ipv6(buf, sizeof(buf), (const struct in6_addr *)
|
address, (const struct in6_addr *) address);
|
else
|
tomoyo_print_ipv4(buf, sizeof(buf), address, address);
|
len = strlen(buf);
|
snprintf(buf + len, sizeof(buf) - len, " %u",
|
r->param.inet_network.port);
|
return tomoyo_audit_net_log(r, "inet", r->param.inet_network.protocol,
|
r->param.inet_network.operation, buf);
|
}
|
|
/**
|
* tomoyo_audit_unix_log - Audit UNIX network log.
|
*
|
* @r: Pointer to "struct tomoyo_request_info".
|
*
|
* Returns 0 on success, negative value otherwise.
|
*/
|
static int tomoyo_audit_unix_log(struct tomoyo_request_info *r)
|
{
|
return tomoyo_audit_net_log(r, "unix", r->param.unix_network.protocol,
|
r->param.unix_network.operation,
|
r->param.unix_network.address->name);
|
}
|
|
/**
|
* tomoyo_check_inet_acl - Check permission for inet domain socket operation.
|
*
|
* @r: Pointer to "struct tomoyo_request_info".
|
* @ptr: Pointer to "struct tomoyo_acl_info".
|
*
|
* Returns true if granted, false otherwise.
|
*/
|
static bool tomoyo_check_inet_acl(struct tomoyo_request_info *r,
|
const struct tomoyo_acl_info *ptr)
|
{
|
const struct tomoyo_inet_acl *acl =
|
container_of(ptr, typeof(*acl), head);
|
const u8 size = r->param.inet_network.is_ipv6 ? 16 : 4;
|
|
if (!(acl->perm & (1 << r->param.inet_network.operation)) ||
|
!tomoyo_compare_number_union(r->param.inet_network.port,
|
&acl->port))
|
return false;
|
if (acl->address.group)
|
return tomoyo_address_matches_group
|
(r->param.inet_network.is_ipv6,
|
r->param.inet_network.address, acl->address.group);
|
return acl->address.is_ipv6 == r->param.inet_network.is_ipv6 &&
|
memcmp(&acl->address.ip[0],
|
r->param.inet_network.address, size) <= 0 &&
|
memcmp(r->param.inet_network.address,
|
&acl->address.ip[1], size) <= 0;
|
}
|
|
/**
|
* tomoyo_check_unix_acl - Check permission for unix domain socket operation.
|
*
|
* @r: Pointer to "struct tomoyo_request_info".
|
* @ptr: Pointer to "struct tomoyo_acl_info".
|
*
|
* Returns true if granted, false otherwise.
|
*/
|
static bool tomoyo_check_unix_acl(struct tomoyo_request_info *r,
|
const struct tomoyo_acl_info *ptr)
|
{
|
const struct tomoyo_unix_acl *acl =
|
container_of(ptr, typeof(*acl), head);
|
|
return (acl->perm & (1 << r->param.unix_network.operation)) &&
|
tomoyo_compare_name_union(r->param.unix_network.address,
|
&acl->name);
|
}
|
|
/**
|
* tomoyo_inet_entry - Check permission for INET network operation.
|
*
|
* @address: Pointer to "struct tomoyo_addr_info".
|
*
|
* Returns 0 on success, negative value otherwise.
|
*/
|
static int tomoyo_inet_entry(const struct tomoyo_addr_info *address)
|
{
|
const int idx = tomoyo_read_lock();
|
struct tomoyo_request_info r;
|
int error = 0;
|
const u8 type = tomoyo_inet2mac[address->protocol][address->operation];
|
|
if (type && tomoyo_init_request_info(&r, NULL, type)
|
!= TOMOYO_CONFIG_DISABLED) {
|
r.param_type = TOMOYO_TYPE_INET_ACL;
|
r.param.inet_network.protocol = address->protocol;
|
r.param.inet_network.operation = address->operation;
|
r.param.inet_network.is_ipv6 = address->inet.is_ipv6;
|
r.param.inet_network.address = address->inet.address;
|
r.param.inet_network.port = ntohs(address->inet.port);
|
do {
|
tomoyo_check_acl(&r, tomoyo_check_inet_acl);
|
error = tomoyo_audit_inet_log(&r);
|
} while (error == TOMOYO_RETRY_REQUEST);
|
}
|
tomoyo_read_unlock(idx);
|
return error;
|
}
|
|
/**
|
* tomoyo_check_inet_address - Check permission for inet domain socket's operation.
|
*
|
* @addr: Pointer to "struct sockaddr".
|
* @addr_len: Size of @addr.
|
* @port: Port number.
|
* @address: Pointer to "struct tomoyo_addr_info".
|
*
|
* Returns 0 on success, negative value otherwise.
|
*/
|
static int tomoyo_check_inet_address(const struct sockaddr *addr,
|
const unsigned int addr_len,
|
const u16 port,
|
struct tomoyo_addr_info *address)
|
{
|
struct tomoyo_inet_addr_info *i = &address->inet;
|
|
if (addr_len < offsetofend(struct sockaddr, sa_family))
|
return 0;
|
switch (addr->sa_family) {
|
case AF_INET6:
|
if (addr_len < SIN6_LEN_RFC2133)
|
goto skip;
|
i->is_ipv6 = true;
|
i->address = (__be32 *)
|
((struct sockaddr_in6 *) addr)->sin6_addr.s6_addr;
|
i->port = ((struct sockaddr_in6 *) addr)->sin6_port;
|
break;
|
case AF_INET:
|
if (addr_len < sizeof(struct sockaddr_in))
|
goto skip;
|
i->is_ipv6 = false;
|
i->address = (__be32 *)
|
&((struct sockaddr_in *) addr)->sin_addr;
|
i->port = ((struct sockaddr_in *) addr)->sin_port;
|
break;
|
default:
|
goto skip;
|
}
|
if (address->protocol == SOCK_RAW)
|
i->port = htons(port);
|
return tomoyo_inet_entry(address);
|
skip:
|
return 0;
|
}
|
|
/**
|
* tomoyo_unix_entry - Check permission for UNIX network operation.
|
*
|
* @address: Pointer to "struct tomoyo_addr_info".
|
*
|
* Returns 0 on success, negative value otherwise.
|
*/
|
static int tomoyo_unix_entry(const struct tomoyo_addr_info *address)
|
{
|
const int idx = tomoyo_read_lock();
|
struct tomoyo_request_info r;
|
int error = 0;
|
const u8 type = tomoyo_unix2mac[address->protocol][address->operation];
|
|
if (type && tomoyo_init_request_info(&r, NULL, type)
|
!= TOMOYO_CONFIG_DISABLED) {
|
char *buf = address->unix0.addr;
|
int len = address->unix0.addr_len - sizeof(sa_family_t);
|
|
if (len <= 0) {
|
buf = "anonymous";
|
len = 9;
|
} else if (buf[0]) {
|
len = strnlen(buf, len);
|
}
|
buf = tomoyo_encode2(buf, len);
|
if (buf) {
|
struct tomoyo_path_info addr;
|
|
addr.name = buf;
|
tomoyo_fill_path_info(&addr);
|
r.param_type = TOMOYO_TYPE_UNIX_ACL;
|
r.param.unix_network.protocol = address->protocol;
|
r.param.unix_network.operation = address->operation;
|
r.param.unix_network.address = &addr;
|
do {
|
tomoyo_check_acl(&r, tomoyo_check_unix_acl);
|
error = tomoyo_audit_unix_log(&r);
|
} while (error == TOMOYO_RETRY_REQUEST);
|
kfree(buf);
|
} else
|
error = -ENOMEM;
|
}
|
tomoyo_read_unlock(idx);
|
return error;
|
}
|
|
/**
|
* tomoyo_check_unix_address - Check permission for unix domain socket's operation.
|
*
|
* @addr: Pointer to "struct sockaddr".
|
* @addr_len: Size of @addr.
|
* @address: Pointer to "struct tomoyo_addr_info".
|
*
|
* Returns 0 on success, negative value otherwise.
|
*/
|
static int tomoyo_check_unix_address(struct sockaddr *addr,
|
const unsigned int addr_len,
|
struct tomoyo_addr_info *address)
|
{
|
struct tomoyo_unix_addr_info *u = &address->unix0;
|
|
if (addr_len < offsetofend(struct sockaddr, sa_family))
|
return 0;
|
if (addr->sa_family != AF_UNIX)
|
return 0;
|
u->addr = ((struct sockaddr_un *) addr)->sun_path;
|
u->addr_len = addr_len;
|
return tomoyo_unix_entry(address);
|
}
|
|
/**
|
* tomoyo_kernel_service - Check whether I'm kernel service or not.
|
*
|
* Returns true if I'm kernel service, false otherwise.
|
*/
|
static bool tomoyo_kernel_service(void)
|
{
|
/* Nothing to do if I am a kernel service. */
|
return (current->flags & (PF_KTHREAD | PF_IO_WORKER)) == PF_KTHREAD;
|
}
|
|
/**
|
* tomoyo_sock_family - Get socket's family.
|
*
|
* @sk: Pointer to "struct sock".
|
*
|
* Returns one of PF_INET, PF_INET6, PF_UNIX or 0.
|
*/
|
static u8 tomoyo_sock_family(struct sock *sk)
|
{
|
u8 family;
|
|
if (tomoyo_kernel_service())
|
return 0;
|
family = sk->sk_family;
|
switch (family) {
|
case PF_INET:
|
case PF_INET6:
|
case PF_UNIX:
|
return family;
|
default:
|
return 0;
|
}
|
}
|
|
/**
|
* tomoyo_socket_listen_permission - Check permission for listening a socket.
|
*
|
* @sock: Pointer to "struct socket".
|
*
|
* Returns 0 on success, negative value otherwise.
|
*/
|
int tomoyo_socket_listen_permission(struct socket *sock)
|
{
|
struct tomoyo_addr_info address;
|
const u8 family = tomoyo_sock_family(sock->sk);
|
const unsigned int type = sock->type;
|
struct sockaddr_storage addr;
|
int addr_len;
|
|
if (!family || (type != SOCK_STREAM && type != SOCK_SEQPACKET))
|
return 0;
|
{
|
const int error = sock->ops->getname(sock, (struct sockaddr *)
|
&addr, 0);
|
|
if (error < 0)
|
return error;
|
addr_len = error;
|
}
|
address.protocol = type;
|
address.operation = TOMOYO_NETWORK_LISTEN;
|
if (family == PF_UNIX)
|
return tomoyo_check_unix_address((struct sockaddr *) &addr,
|
addr_len, &address);
|
return tomoyo_check_inet_address((struct sockaddr *) &addr, addr_len,
|
0, &address);
|
}
|
|
/**
|
* tomoyo_socket_connect_permission - Check permission for setting the remote address of a socket.
|
*
|
* @sock: Pointer to "struct socket".
|
* @addr: Pointer to "struct sockaddr".
|
* @addr_len: Size of @addr.
|
*
|
* Returns 0 on success, negative value otherwise.
|
*/
|
int tomoyo_socket_connect_permission(struct socket *sock,
|
struct sockaddr *addr, int addr_len)
|
{
|
struct tomoyo_addr_info address;
|
const u8 family = tomoyo_sock_family(sock->sk);
|
const unsigned int type = sock->type;
|
|
if (!family)
|
return 0;
|
address.protocol = type;
|
switch (type) {
|
case SOCK_DGRAM:
|
case SOCK_RAW:
|
address.operation = TOMOYO_NETWORK_SEND;
|
break;
|
case SOCK_STREAM:
|
case SOCK_SEQPACKET:
|
address.operation = TOMOYO_NETWORK_CONNECT;
|
break;
|
default:
|
return 0;
|
}
|
if (family == PF_UNIX)
|
return tomoyo_check_unix_address(addr, addr_len, &address);
|
return tomoyo_check_inet_address(addr, addr_len, sock->sk->sk_protocol,
|
&address);
|
}
|
|
/**
|
* tomoyo_socket_bind_permission - Check permission for setting the local address of a socket.
|
*
|
* @sock: Pointer to "struct socket".
|
* @addr: Pointer to "struct sockaddr".
|
* @addr_len: Size of @addr.
|
*
|
* Returns 0 on success, negative value otherwise.
|
*/
|
int tomoyo_socket_bind_permission(struct socket *sock, struct sockaddr *addr,
|
int addr_len)
|
{
|
struct tomoyo_addr_info address;
|
const u8 family = tomoyo_sock_family(sock->sk);
|
const unsigned int type = sock->type;
|
|
if (!family)
|
return 0;
|
switch (type) {
|
case SOCK_STREAM:
|
case SOCK_DGRAM:
|
case SOCK_RAW:
|
case SOCK_SEQPACKET:
|
address.protocol = type;
|
address.operation = TOMOYO_NETWORK_BIND;
|
break;
|
default:
|
return 0;
|
}
|
if (family == PF_UNIX)
|
return tomoyo_check_unix_address(addr, addr_len, &address);
|
return tomoyo_check_inet_address(addr, addr_len, sock->sk->sk_protocol,
|
&address);
|
}
|
|
/**
|
* tomoyo_socket_sendmsg_permission - Check permission for sending a datagram.
|
*
|
* @sock: Pointer to "struct socket".
|
* @msg: Pointer to "struct msghdr".
|
* @size: Unused.
|
*
|
* Returns 0 on success, negative value otherwise.
|
*/
|
int tomoyo_socket_sendmsg_permission(struct socket *sock, struct msghdr *msg,
|
int size)
|
{
|
struct tomoyo_addr_info address;
|
const u8 family = tomoyo_sock_family(sock->sk);
|
const unsigned int type = sock->type;
|
|
if (!msg->msg_name || !family ||
|
(type != SOCK_DGRAM && type != SOCK_RAW))
|
return 0;
|
address.protocol = type;
|
address.operation = TOMOYO_NETWORK_SEND;
|
if (family == PF_UNIX)
|
return tomoyo_check_unix_address((struct sockaddr *)
|
msg->msg_name,
|
msg->msg_namelen, &address);
|
return tomoyo_check_inet_address((struct sockaddr *) msg->msg_name,
|
msg->msg_namelen,
|
sock->sk->sk_protocol, &address);
|
}
|
