linux-stable/net/netlabel/netlabel_calipso.c
Thomas Gleixner 1ccea77e2a treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13
Based on 2 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this program if not see http www gnu org licenses

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details [based]
  [from] [clk] [highbank] [c] you should have received a copy of the
  gnu general public license along with this program if not see http
  www gnu org licenses

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 355 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Jilayne Lovejoy <opensource@jilayne.com>
Reviewed-by: Steve Winslow <swinslow@gmail.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190519154041.837383322@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-21 11:28:45 +02:00

730 lines
19 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* NetLabel CALIPSO/IPv6 Support
*
* This file defines the CALIPSO/IPv6 functions for the NetLabel system. The
* NetLabel system manages static and dynamic label mappings for network
* protocols such as CIPSO and CALIPSO.
*
* Authors: Paul Moore <paul@paul-moore.com>
* Huw Davies <huw@codeweavers.com>
*/
/* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
* (c) Copyright Huw Davies <huw@codeweavers.com>, 2015
*/
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/audit.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <net/netlink.h>
#include <net/genetlink.h>
#include <net/netlabel.h>
#include <net/calipso.h>
#include <linux/atomic.h>
#include "netlabel_user.h"
#include "netlabel_calipso.h"
#include "netlabel_mgmt.h"
#include "netlabel_domainhash.h"
/* Argument struct for calipso_doi_walk() */
struct netlbl_calipso_doiwalk_arg {
struct netlink_callback *nl_cb;
struct sk_buff *skb;
u32 seq;
};
/* Argument struct for netlbl_domhsh_walk() */
struct netlbl_domhsh_walk_arg {
struct netlbl_audit *audit_info;
u32 doi;
};
/* NetLabel Generic NETLINK CALIPSO family */
static struct genl_family netlbl_calipso_gnl_family;
/* NetLabel Netlink attribute policy */
static const struct nla_policy calipso_genl_policy[NLBL_CALIPSO_A_MAX + 1] = {
[NLBL_CALIPSO_A_DOI] = { .type = NLA_U32 },
[NLBL_CALIPSO_A_MTYPE] = { .type = NLA_U32 },
};
/* NetLabel Command Handlers
*/
/**
* netlbl_calipso_add_pass - Adds a CALIPSO pass DOI definition
* @info: the Generic NETLINK info block
* @audit_info: NetLabel audit information
*
* Description:
* Create a new CALIPSO_MAP_PASS DOI definition based on the given ADD message
* and add it to the CALIPSO engine. Return zero on success and non-zero on
* error.
*
*/
static int netlbl_calipso_add_pass(struct genl_info *info,
struct netlbl_audit *audit_info)
{
int ret_val;
struct calipso_doi *doi_def = NULL;
doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
if (!doi_def)
return -ENOMEM;
doi_def->type = CALIPSO_MAP_PASS;
doi_def->doi = nla_get_u32(info->attrs[NLBL_CALIPSO_A_DOI]);
ret_val = calipso_doi_add(doi_def, audit_info);
if (ret_val != 0)
calipso_doi_free(doi_def);
return ret_val;
}
/**
* netlbl_calipso_add - Handle an ADD message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Create a new DOI definition based on the given ADD message and add it to the
* CALIPSO engine. Returns zero on success, negative values on failure.
*
*/
static int netlbl_calipso_add(struct sk_buff *skb, struct genl_info *info)
{
int ret_val = -EINVAL;
struct netlbl_audit audit_info;
if (!info->attrs[NLBL_CALIPSO_A_DOI] ||
!info->attrs[NLBL_CALIPSO_A_MTYPE])
return -EINVAL;
netlbl_netlink_auditinfo(skb, &audit_info);
switch (nla_get_u32(info->attrs[NLBL_CALIPSO_A_MTYPE])) {
case CALIPSO_MAP_PASS:
ret_val = netlbl_calipso_add_pass(info, &audit_info);
break;
}
if (ret_val == 0)
atomic_inc(&netlabel_mgmt_protocount);
return ret_val;
}
/**
* netlbl_calipso_list - Handle a LIST message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated LIST message and respond accordingly.
* Returns zero on success and negative values on error.
*
*/
static int netlbl_calipso_list(struct sk_buff *skb, struct genl_info *info)
{
int ret_val;
struct sk_buff *ans_skb = NULL;
void *data;
u32 doi;
struct calipso_doi *doi_def;
if (!info->attrs[NLBL_CALIPSO_A_DOI]) {
ret_val = -EINVAL;
goto list_failure;
}
doi = nla_get_u32(info->attrs[NLBL_CALIPSO_A_DOI]);
doi_def = calipso_doi_getdef(doi);
if (!doi_def) {
ret_val = -EINVAL;
goto list_failure;
}
ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!ans_skb) {
ret_val = -ENOMEM;
goto list_failure_put;
}
data = genlmsg_put_reply(ans_skb, info, &netlbl_calipso_gnl_family,
0, NLBL_CALIPSO_C_LIST);
if (!data) {
ret_val = -ENOMEM;
goto list_failure_put;
}
ret_val = nla_put_u32(ans_skb, NLBL_CALIPSO_A_MTYPE, doi_def->type);
if (ret_val != 0)
goto list_failure_put;
calipso_doi_putdef(doi_def);
genlmsg_end(ans_skb, data);
return genlmsg_reply(ans_skb, info);
list_failure_put:
calipso_doi_putdef(doi_def);
list_failure:
kfree_skb(ans_skb);
return ret_val;
}
/**
* netlbl_calipso_listall_cb - calipso_doi_walk() callback for LISTALL
* @doi_def: the CALIPSO DOI definition
* @arg: the netlbl_calipso_doiwalk_arg structure
*
* Description:
* This function is designed to be used as a callback to the
* calipso_doi_walk() function for use in generating a response for a LISTALL
* message. Returns the size of the message on success, negative values on
* failure.
*
*/
static int netlbl_calipso_listall_cb(struct calipso_doi *doi_def, void *arg)
{
int ret_val = -ENOMEM;
struct netlbl_calipso_doiwalk_arg *cb_arg = arg;
void *data;
data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).portid,
cb_arg->seq, &netlbl_calipso_gnl_family,
NLM_F_MULTI, NLBL_CALIPSO_C_LISTALL);
if (!data)
goto listall_cb_failure;
ret_val = nla_put_u32(cb_arg->skb, NLBL_CALIPSO_A_DOI, doi_def->doi);
if (ret_val != 0)
goto listall_cb_failure;
ret_val = nla_put_u32(cb_arg->skb,
NLBL_CALIPSO_A_MTYPE,
doi_def->type);
if (ret_val != 0)
goto listall_cb_failure;
genlmsg_end(cb_arg->skb, data);
return 0;
listall_cb_failure:
genlmsg_cancel(cb_arg->skb, data);
return ret_val;
}
/**
* netlbl_calipso_listall - Handle a LISTALL message
* @skb: the NETLINK buffer
* @cb: the NETLINK callback
*
* Description:
* Process a user generated LISTALL message and respond accordingly. Returns
* zero on success and negative values on error.
*
*/
static int netlbl_calipso_listall(struct sk_buff *skb,
struct netlink_callback *cb)
{
struct netlbl_calipso_doiwalk_arg cb_arg;
u32 doi_skip = cb->args[0];
cb_arg.nl_cb = cb;
cb_arg.skb = skb;
cb_arg.seq = cb->nlh->nlmsg_seq;
calipso_doi_walk(&doi_skip, netlbl_calipso_listall_cb, &cb_arg);
cb->args[0] = doi_skip;
return skb->len;
}
/**
* netlbl_calipso_remove_cb - netlbl_calipso_remove() callback for REMOVE
* @entry: LSM domain mapping entry
* @arg: the netlbl_domhsh_walk_arg structure
*
* Description:
* This function is intended for use by netlbl_calipso_remove() as the callback
* for the netlbl_domhsh_walk() function; it removes LSM domain map entries
* which are associated with the CALIPSO DOI specified in @arg. Returns zero on
* success, negative values on failure.
*
*/
static int netlbl_calipso_remove_cb(struct netlbl_dom_map *entry, void *arg)
{
struct netlbl_domhsh_walk_arg *cb_arg = arg;
if (entry->def.type == NETLBL_NLTYPE_CALIPSO &&
entry->def.calipso->doi == cb_arg->doi)
return netlbl_domhsh_remove_entry(entry, cb_arg->audit_info);
return 0;
}
/**
* netlbl_calipso_remove - Handle a REMOVE message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated REMOVE message and respond accordingly. Returns
* zero on success, negative values on failure.
*
*/
static int netlbl_calipso_remove(struct sk_buff *skb, struct genl_info *info)
{
int ret_val = -EINVAL;
struct netlbl_domhsh_walk_arg cb_arg;
struct netlbl_audit audit_info;
u32 skip_bkt = 0;
u32 skip_chain = 0;
if (!info->attrs[NLBL_CALIPSO_A_DOI])
return -EINVAL;
netlbl_netlink_auditinfo(skb, &audit_info);
cb_arg.doi = nla_get_u32(info->attrs[NLBL_CALIPSO_A_DOI]);
cb_arg.audit_info = &audit_info;
ret_val = netlbl_domhsh_walk(&skip_bkt, &skip_chain,
netlbl_calipso_remove_cb, &cb_arg);
if (ret_val == 0 || ret_val == -ENOENT) {
ret_val = calipso_doi_remove(cb_arg.doi, &audit_info);
if (ret_val == 0)
atomic_dec(&netlabel_mgmt_protocount);
}
return ret_val;
}
/* NetLabel Generic NETLINK Command Definitions
*/
static const struct genl_ops netlbl_calipso_ops[] = {
{
.cmd = NLBL_CALIPSO_C_ADD,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_ADMIN_PERM,
.doit = netlbl_calipso_add,
.dumpit = NULL,
},
{
.cmd = NLBL_CALIPSO_C_REMOVE,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_ADMIN_PERM,
.doit = netlbl_calipso_remove,
.dumpit = NULL,
},
{
.cmd = NLBL_CALIPSO_C_LIST,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = 0,
.doit = netlbl_calipso_list,
.dumpit = NULL,
},
{
.cmd = NLBL_CALIPSO_C_LISTALL,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = 0,
.doit = NULL,
.dumpit = netlbl_calipso_listall,
},
};
static struct genl_family netlbl_calipso_gnl_family __ro_after_init = {
.hdrsize = 0,
.name = NETLBL_NLTYPE_CALIPSO_NAME,
.version = NETLBL_PROTO_VERSION,
.maxattr = NLBL_CALIPSO_A_MAX,
.policy = calipso_genl_policy,
.module = THIS_MODULE,
.ops = netlbl_calipso_ops,
.n_ops = ARRAY_SIZE(netlbl_calipso_ops),
};
/* NetLabel Generic NETLINK Protocol Functions
*/
/**
* netlbl_calipso_genl_init - Register the CALIPSO NetLabel component
*
* Description:
* Register the CALIPSO packet NetLabel component with the Generic NETLINK
* mechanism. Returns zero on success, negative values on failure.
*
*/
int __init netlbl_calipso_genl_init(void)
{
return genl_register_family(&netlbl_calipso_gnl_family);
}
static const struct netlbl_calipso_ops *calipso_ops;
/**
* netlbl_calipso_ops_register - Register the CALIPSO operations
*
* Description:
* Register the CALIPSO packet engine operations.
*
*/
const struct netlbl_calipso_ops *
netlbl_calipso_ops_register(const struct netlbl_calipso_ops *ops)
{
return xchg(&calipso_ops, ops);
}
EXPORT_SYMBOL(netlbl_calipso_ops_register);
static const struct netlbl_calipso_ops *netlbl_calipso_ops_get(void)
{
return READ_ONCE(calipso_ops);
}
/**
* calipso_doi_add - Add a new DOI to the CALIPSO protocol engine
* @doi_def: the DOI structure
* @audit_info: NetLabel audit information
*
* Description:
* The caller defines a new DOI for use by the CALIPSO engine and calls this
* function to add it to the list of acceptable domains. The caller must
* ensure that the mapping table specified in @doi_def->map meets all of the
* requirements of the mapping type (see calipso.h for details). Returns
* zero on success and non-zero on failure.
*
*/
int calipso_doi_add(struct calipso_doi *doi_def,
struct netlbl_audit *audit_info)
{
int ret_val = -ENOMSG;
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
if (ops)
ret_val = ops->doi_add(doi_def, audit_info);
return ret_val;
}
/**
* calipso_doi_free - Frees a DOI definition
* @doi_def: the DOI definition
*
* Description:
* This function frees all of the memory associated with a DOI definition.
*
*/
void calipso_doi_free(struct calipso_doi *doi_def)
{
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
if (ops)
ops->doi_free(doi_def);
}
/**
* calipso_doi_remove - Remove an existing DOI from the CALIPSO protocol engine
* @doi: the DOI value
* @audit_secid: the LSM secid to use in the audit message
*
* Description:
* Removes a DOI definition from the CALIPSO engine. The NetLabel routines will
* be called to release their own LSM domain mappings as well as our own
* domain list. Returns zero on success and negative values on failure.
*
*/
int calipso_doi_remove(u32 doi, struct netlbl_audit *audit_info)
{
int ret_val = -ENOMSG;
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
if (ops)
ret_val = ops->doi_remove(doi, audit_info);
return ret_val;
}
/**
* calipso_doi_getdef - Returns a reference to a valid DOI definition
* @doi: the DOI value
*
* Description:
* Searches for a valid DOI definition and if one is found it is returned to
* the caller. Otherwise NULL is returned. The caller must ensure that
* calipso_doi_putdef() is called when the caller is done.
*
*/
struct calipso_doi *calipso_doi_getdef(u32 doi)
{
struct calipso_doi *ret_val = NULL;
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
if (ops)
ret_val = ops->doi_getdef(doi);
return ret_val;
}
/**
* calipso_doi_putdef - Releases a reference for the given DOI definition
* @doi_def: the DOI definition
*
* Description:
* Releases a DOI definition reference obtained from calipso_doi_getdef().
*
*/
void calipso_doi_putdef(struct calipso_doi *doi_def)
{
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
if (ops)
ops->doi_putdef(doi_def);
}
/**
* calipso_doi_walk - Iterate through the DOI definitions
* @skip_cnt: skip past this number of DOI definitions, updated
* @callback: callback for each DOI definition
* @cb_arg: argument for the callback function
*
* Description:
* Iterate over the DOI definition list, skipping the first @skip_cnt entries.
* For each entry call @callback, if @callback returns a negative value stop
* 'walking' through the list and return. Updates the value in @skip_cnt upon
* return. Returns zero on success, negative values on failure.
*
*/
int calipso_doi_walk(u32 *skip_cnt,
int (*callback)(struct calipso_doi *doi_def, void *arg),
void *cb_arg)
{
int ret_val = -ENOMSG;
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
if (ops)
ret_val = ops->doi_walk(skip_cnt, callback, cb_arg);
return ret_val;
}
/**
* calipso_sock_getattr - Get the security attributes from a sock
* @sk: the sock
* @secattr: the security attributes
*
* Description:
* Query @sk to see if there is a CALIPSO option attached to the sock and if
* there is return the CALIPSO security attributes in @secattr. This function
* requires that @sk be locked, or privately held, but it does not do any
* locking itself. Returns zero on success and negative values on failure.
*
*/
int calipso_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
{
int ret_val = -ENOMSG;
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
if (ops)
ret_val = ops->sock_getattr(sk, secattr);
return ret_val;
}
/**
* calipso_sock_setattr - Add a CALIPSO option to a socket
* @sk: the socket
* @doi_def: the CALIPSO DOI to use
* @secattr: the specific security attributes of the socket
*
* Description:
* Set the CALIPSO option on the given socket using the DOI definition and
* security attributes passed to the function. This function requires
* exclusive access to @sk, which means it either needs to be in the
* process of being created or locked. Returns zero on success and negative
* values on failure.
*
*/
int calipso_sock_setattr(struct sock *sk,
const struct calipso_doi *doi_def,
const struct netlbl_lsm_secattr *secattr)
{
int ret_val = -ENOMSG;
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
if (ops)
ret_val = ops->sock_setattr(sk, doi_def, secattr);
return ret_val;
}
/**
* calipso_sock_delattr - Delete the CALIPSO option from a socket
* @sk: the socket
*
* Description:
* Removes the CALIPSO option from a socket, if present.
*
*/
void calipso_sock_delattr(struct sock *sk)
{
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
if (ops)
ops->sock_delattr(sk);
}
/**
* calipso_req_setattr - Add a CALIPSO option to a connection request socket
* @req: the connection request socket
* @doi_def: the CALIPSO DOI to use
* @secattr: the specific security attributes of the socket
*
* Description:
* Set the CALIPSO option on the given socket using the DOI definition and
* security attributes passed to the function. Returns zero on success and
* negative values on failure.
*
*/
int calipso_req_setattr(struct request_sock *req,
const struct calipso_doi *doi_def,
const struct netlbl_lsm_secattr *secattr)
{
int ret_val = -ENOMSG;
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
if (ops)
ret_val = ops->req_setattr(req, doi_def, secattr);
return ret_val;
}
/**
* calipso_req_delattr - Delete the CALIPSO option from a request socket
* @reg: the request socket
*
* Description:
* Removes the CALIPSO option from a request socket, if present.
*
*/
void calipso_req_delattr(struct request_sock *req)
{
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
if (ops)
ops->req_delattr(req);
}
/**
* calipso_optptr - Find the CALIPSO option in the packet
* @skb: the packet
*
* Description:
* Parse the packet's IP header looking for a CALIPSO option. Returns a pointer
* to the start of the CALIPSO option on success, NULL if one if not found.
*
*/
unsigned char *calipso_optptr(const struct sk_buff *skb)
{
unsigned char *ret_val = NULL;
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
if (ops)
ret_val = ops->skbuff_optptr(skb);
return ret_val;
}
/**
* calipso_getattr - Get the security attributes from a memory block.
* @calipso: the CALIPSO option
* @secattr: the security attributes
*
* Description:
* Inspect @calipso and return the security attributes in @secattr.
* Returns zero on success and negative values on failure.
*
*/
int calipso_getattr(const unsigned char *calipso,
struct netlbl_lsm_secattr *secattr)
{
int ret_val = -ENOMSG;
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
if (ops)
ret_val = ops->opt_getattr(calipso, secattr);
return ret_val;
}
/**
* calipso_skbuff_setattr - Set the CALIPSO option on a packet
* @skb: the packet
* @doi_def: the CALIPSO DOI to use
* @secattr: the security attributes
*
* Description:
* Set the CALIPSO option on the given packet based on the security attributes.
* Returns a pointer to the IP header on success and NULL on failure.
*
*/
int calipso_skbuff_setattr(struct sk_buff *skb,
const struct calipso_doi *doi_def,
const struct netlbl_lsm_secattr *secattr)
{
int ret_val = -ENOMSG;
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
if (ops)
ret_val = ops->skbuff_setattr(skb, doi_def, secattr);
return ret_val;
}
/**
* calipso_skbuff_delattr - Delete any CALIPSO options from a packet
* @skb: the packet
*
* Description:
* Removes any and all CALIPSO options from the given packet. Returns zero on
* success, negative values on failure.
*
*/
int calipso_skbuff_delattr(struct sk_buff *skb)
{
int ret_val = -ENOMSG;
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
if (ops)
ret_val = ops->skbuff_delattr(skb);
return ret_val;
}
/**
* calipso_cache_invalidate - Invalidates the current CALIPSO cache
*
* Description:
* Invalidates and frees any entries in the CALIPSO cache. Returns zero on
* success and negative values on failure.
*
*/
void calipso_cache_invalidate(void)
{
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
if (ops)
ops->cache_invalidate();
}
/**
* calipso_cache_add - Add an entry to the CALIPSO cache
* @calipso_ptr: the CALIPSO option
* @secattr: the packet's security attributes
*
* Description:
* Add a new entry into the CALIPSO label mapping cache.
* Returns zero on success, negative values on failure.
*
*/
int calipso_cache_add(const unsigned char *calipso_ptr,
const struct netlbl_lsm_secattr *secattr)
{
int ret_val = -ENOMSG;
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
if (ops)
ret_val = ops->cache_add(calipso_ptr, secattr);
return ret_val;
}