linux/security/tomoyo/network.c
Greg Kroah-Hartman b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-02 11:10:55 +01:00

773 lines
21 KiB
C

// 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 = *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;
*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 = *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;
*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;
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->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 uaccess_kernel();
}
/**
* 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, &addr_len, 0);
if (error)
return 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);
}