// 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 <[email protected]>
* Huw Davies <[email protected]>
*/
/* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
* (c) Copyright Huw Davies <[email protected]>, 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 },
};
static const struct netlbl_calipso_ops *calipso_ops;
/**
* netlbl_calipso_ops_register - Register the CALIPSO operations
* @ops: ops to register
*
* 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);
}
/* 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;
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
if (!info->attrs[NLBL_CALIPSO_A_DOI] ||
!info->attrs[NLBL_CALIPSO_A_MTYPE])
return -EINVAL;
if (!ops)
return -EOPNOTSUPP;
netlbl_netlink_auditinfo(&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(&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_small_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,
.small_ops = netlbl_calipso_ops,
.n_small_ops = ARRAY_SIZE(netlbl_calipso_ops),
.resv_start_op = NLBL_CALIPSO_C_LISTALL + 1,
};
/* 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);
}
/**
* 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_info: NetLabel audit information
*
* 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
* @req: 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;
}
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