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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6 

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6:
  smack: Add a new '-CIPSO' option to the network address label configuration
  netlabel: Cleanup the Smack/NetLabel code to fix incoming TCP connections
  lsm: Remove the socket_post_accept() hook
  selinux: Remove the "compat_net" compatibility code
  netlabel: Label incoming TCP connections correctly in SELinux
  lsm: Relocate the IPv4 security_inet_conn_request() hooks
  TOMOYO: Fix a typo.
  smack: convert smack to standard linux lists
This commit is contained in:
Linus Torvalds 2009-03-28 17:30:42 -07:00
Родитель 795e2fe0a3 4303154e86
Коммит 7541bba880
22 изменённых файлов: 787 добавлений и 741 удалений
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42
Documentation/Smack.txt
Просмотреть файл

@ -184,14 +184,16 @@ length. Single character labels using special characters, that being anything
other than a letter or digit, are reserved for use by the Smack development
team. Smack labels are unstructured, case sensitive, and the only operation
ever performed on them is comparison for equality. Smack labels cannot
contain unprintable characters or the "/" (slash) character.
contain unprintable characters or the "/" (slash) character. Smack labels
cannot begin with a '-', which is reserved for special options.
There are some predefined labels:
_ Pronounced "floor", a single underscore character.
^ Pronounced "hat", a single circumflex character.
* Pronounced "star", a single asterisk character.
? Pronounced "huh", a single question mark character.
_ Pronounced "floor", a single underscore character.
^ Pronounced "hat", a single circumflex character.
* Pronounced "star", a single asterisk character.
? Pronounced "huh", a single question mark character.
@ Pronounced "Internet", a single at sign character.
Every task on a Smack system is assigned a label. System tasks, such as
init(8) and systems daemons, are run with the floor ("_") label. User tasks
@ -412,6 +414,36 @@ sockets.
A privileged program may set this to match the label of another
task with which it hopes to communicate.
Smack Netlabel Exceptions
You will often find that your labeled application has to talk to the outside,
unlabeled world. To do this there's a special file /smack/netlabel where you can
add some exceptions in the form of :
@IP1 LABEL1 or
@IP2/MASK LABEL2
It means that your application will have unlabeled access to @IP1 if it has
write access on LABEL1, and access to the subnet @IP2/MASK if it has write
access on LABEL2.
Entries in the /smack/netlabel file are matched by longest mask first, like in
classless IPv4 routing.
A special label '@' and an option '-CIPSO' can be used there :
@ means Internet, any application with any label has access to it
-CIPSO means standard CIPSO networking
If you don't know what CIPSO is and don't plan to use it, you can just do :
echo 127.0.0.1 -CIPSO > /smack/netlabel
echo 0.0.0.0/0 @ > /smack/netlabel
If you use CIPSO on your 192.168.0.0/16 local network and need also unlabeled
Internet access, you can have :
echo 127.0.0.1 -CIPSO > /smack/netlabel
echo 192.168.0.0/16 -CIPSO > /smack/netlabel
echo 0.0.0.0/0 @ > /smack/netlabel
Writing Applications for Smack
There are three sorts of applications that will run on a Smack system. How an

11
Documentation/feature-removal-schedule.txt
Просмотреть файл

@ -356,17 +356,6 @@ Who: Hans de Goede <hdegoede@redhat.com>
---------------------------
What: SELinux "compat_net" functionality
When: 2.6.30 at the earliest
Why: In 2.6.18 the Secmark concept was introduced to replace the "compat_net"
network access control functionality of SELinux. Secmark offers both
better performance and greater flexibility than the "compat_net"
mechanism. Now that the major Linux distributions have moved to
Secmark, it is time to deprecate the older mechanism and start the
process of removing the old code.
Who: Paul Moore <paul.moore@hp.com>
---------------------------
What: sysfs ui for changing p4-clockmod parameters
When: September 2009
Why: See commits 129f8ae9b1b5be94517da76009ea956e89104ce8 and

9
Documentation/kernel-parameters.txt
Просмотреть файл

@ -2030,15 +2030,6 @@ and is between 256 and 4096 characters. It is defined in the file
If enabled at boot time, /selinux/disable can be used
later to disable prior to initial policy load.
selinux_compat_net =
[SELINUX] Set initial selinux_compat_net flag value.
Format: { "0" | "1" }
0 -- use new secmark-based packet controls
1 -- use legacy packet controls
Default value is 0 (preferred).
Value can be changed at runtime via
/selinux/compat_net.
serialnumber [BUGS=X86-32]
shapers= [NET]

13
include/linux/security.h
Просмотреть файл

@ -880,11 +880,6 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
* @sock contains the listening socket structure.
* @newsock contains the newly created server socket for connection.
* Return 0 if permission is granted.
* @socket_post_accept:
* This hook allows a security module to copy security
* information into the newly created socket's inode.
* @sock contains the listening socket structure.
* @newsock contains the newly created server socket for connection.
* @socket_sendmsg:
* Check permission before transmitting a message to another socket.
* @sock contains the socket structure.
@ -1554,8 +1549,6 @@ struct security_operations {
struct sockaddr *address, int addrlen);
int (*socket_listen) (struct socket *sock, int backlog);
int (*socket_accept) (struct socket *sock, struct socket *newsock);
void (*socket_post_accept) (struct socket *sock,
struct socket *newsock);
int (*socket_sendmsg) (struct socket *sock,
struct msghdr *msg, int size);
int (*socket_recvmsg) (struct socket *sock,
@ -2537,7 +2530,6 @@ int security_socket_bind(struct socket *sock, struct sockaddr *address, int addr
int security_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen);
int security_socket_listen(struct socket *sock, int backlog);
int security_socket_accept(struct socket *sock, struct socket *newsock);
void security_socket_post_accept(struct socket *sock, struct socket *newsock);
int security_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size);
int security_socket_recvmsg(struct socket *sock, struct msghdr *msg,
int size, int flags);
@ -2616,11 +2608,6 @@ static inline int security_socket_accept(struct socket *sock,
return 0;
}
static inline void security_socket_post_accept(struct socket *sock,
struct socket *newsock)
{
}
static inline int security_socket_sendmsg(struct socket *sock,
struct msghdr *msg, int size)
{

17
include/net/cipso_ipv4.h
Просмотреть файл

@ -40,6 +40,7 @@
#include <linux/net.h>
#include <linux/skbuff.h>
#include <net/netlabel.h>
#include <net/request_sock.h>
#include <asm/atomic.h>
/* known doi values */
@ -215,6 +216,10 @@ int cipso_v4_sock_setattr(struct sock *sk,
const struct netlbl_lsm_secattr *secattr);
void cipso_v4_sock_delattr(struct sock *sk);
int cipso_v4_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr);
int cipso_v4_req_setattr(struct request_sock *req,
const struct cipso_v4_doi *doi_def,
const struct netlbl_lsm_secattr *secattr);
void cipso_v4_req_delattr(struct request_sock *req);
int cipso_v4_skbuff_setattr(struct sk_buff *skb,
const struct cipso_v4_doi *doi_def,
const struct netlbl_lsm_secattr *secattr);
@ -247,6 +252,18 @@ static inline int cipso_v4_sock_getattr(struct sock *sk,
return -ENOSYS;
}
static inline int cipso_v4_req_setattr(struct request_sock *req,
const struct cipso_v4_doi *doi_def,
const struct netlbl_lsm_secattr *secattr)
{
return -ENOSYS;
}
static inline void cipso_v4_req_delattr(struct request_sock *req)
{
return;
}
static inline int cipso_v4_skbuff_setattr(struct sk_buff *skb,
const struct cipso_v4_doi *doi_def,
const struct netlbl_lsm_secattr *secattr)

17
include/net/netlabel.h
Просмотреть файл

@ -36,6 +36,7 @@
#include <linux/in.h>
#include <linux/in6.h>
#include <net/netlink.h>
#include <net/request_sock.h>
#include <asm/atomic.h>
struct cipso_v4_doi;
@ -406,6 +407,7 @@ int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
*/
int netlbl_enabled(void);
int netlbl_sock_setattr(struct sock *sk,
u16 family,
const struct netlbl_lsm_secattr *secattr);
void netlbl_sock_delattr(struct sock *sk);
int netlbl_sock_getattr(struct sock *sk,
@ -413,6 +415,9 @@ int netlbl_sock_getattr(struct sock *sk,
int netlbl_conn_setattr(struct sock *sk,
struct sockaddr *addr,
const struct netlbl_lsm_secattr *secattr);
int netlbl_req_setattr(struct request_sock *req,
const struct netlbl_lsm_secattr *secattr);
void netlbl_req_delattr(struct request_sock *req);
int netlbl_skbuff_setattr(struct sk_buff *skb,
u16 family,
const struct netlbl_lsm_secattr *secattr);
@ -519,7 +524,8 @@ static inline int netlbl_enabled(void)
return 0;
}
static inline int netlbl_sock_setattr(struct sock *sk,
const struct netlbl_lsm_secattr *secattr)
u16 family,
const struct netlbl_lsm_secattr *secattr)
{
return -ENOSYS;
}
@ -537,6 +543,15 @@ static inline int netlbl_conn_setattr(struct sock *sk,
{
return -ENOSYS;
}
static inline int netlbl_req_setattr(struct request_sock *req,
const struct netlbl_lsm_secattr *secattr)
{
return -ENOSYS;
}
static inline void netlbl_req_delattr(struct request_sock *req)
{
return;
}
static inline int netlbl_skbuff_setattr(struct sk_buff *skb,
u16 family,
const struct netlbl_lsm_secattr *secattr)

130
net/ipv4/cipso_ipv4.c
Просмотреть файл

@ -1942,23 +1942,85 @@ socket_setattr_failure:
}
/**
* cipso_v4_sock_delattr - Delete the CIPSO option from a socket
* @sk: the socket
* cipso_v4_req_setattr - Add a CIPSO option to a connection request socket
* @req: the connection request socket
* @doi_def: the CIPSO DOI to use
* @secattr: the specific security attributes of the socket
*
* Description:
* Removes the CIPSO option from a socket, if present.
* Set the CIPSO 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.
*
*/
void cipso_v4_sock_delattr(struct sock *sk)
int cipso_v4_req_setattr(struct request_sock *req,
const struct cipso_v4_doi *doi_def,
const struct netlbl_lsm_secattr *secattr)
{
u8 hdr_delta;
struct ip_options *opt;
struct inet_sock *sk_inet;
int ret_val = -EPERM;
unsigned char *buf = NULL;
u32 buf_len;
u32 opt_len;
struct ip_options *opt = NULL;
struct inet_request_sock *req_inet;
sk_inet = inet_sk(sk);
opt = sk_inet->opt;
if (opt == NULL || opt->cipso == 0)
return;
/* We allocate the maximum CIPSO option size here so we are probably
* being a little wasteful, but it makes our life _much_ easier later
* on and after all we are only talking about 40 bytes. */
buf_len = CIPSO_V4_OPT_LEN_MAX;
buf = kmalloc(buf_len, GFP_ATOMIC);
if (buf == NULL) {
ret_val = -ENOMEM;
goto req_setattr_failure;
}
ret_val = cipso_v4_genopt(buf, buf_len, doi_def, secattr);
if (ret_val < 0)
goto req_setattr_failure;
buf_len = ret_val;
/* We can't use ip_options_get() directly because it makes a call to
* ip_options_get_alloc() which allocates memory with GFP_KERNEL and
* we won't always have CAP_NET_RAW even though we _always_ want to
* set the IPOPT_CIPSO option. */
opt_len = (buf_len + 3) & ~3;
opt = kzalloc(sizeof(*opt) + opt_len, GFP_ATOMIC);
if (opt == NULL) {
ret_val = -ENOMEM;
goto req_setattr_failure;
}
memcpy(opt->__data, buf, buf_len);
opt->optlen = opt_len;
opt->cipso = sizeof(struct iphdr);
kfree(buf);
buf = NULL;
req_inet = inet_rsk(req);
opt = xchg(&req_inet->opt, opt);
kfree(opt);
return 0;
req_setattr_failure:
kfree(buf);
kfree(opt);
return ret_val;
}
/**
* cipso_v4_delopt - Delete the CIPSO option from a set of IP options
* @opt_ptr: IP option pointer
*
* Description:
* Deletes the CIPSO IP option from a set of IP options and makes the necessary
* adjustments to the IP option structure. Returns zero on success, negative
* values on failure.
*
*/
int cipso_v4_delopt(struct ip_options **opt_ptr)
{
int hdr_delta = 0;
struct ip_options *opt = *opt_ptr;
if (opt->srr || opt->rr || opt->ts || opt->router_alert) {
u8 cipso_len;
@ -2003,11 +2065,34 @@ void cipso_v4_sock_delattr(struct sock *sk)
} else {
/* only the cipso option was present on the socket so we can
* remove the entire option struct */
sk_inet->opt = NULL;
*opt_ptr = NULL;
hdr_delta = opt->optlen;
kfree(opt);
}
return hdr_delta;
}
/**
* cipso_v4_sock_delattr - Delete the CIPSO option from a socket
* @sk: the socket
*
* Description:
* Removes the CIPSO option from a socket, if present.
*
*/
void cipso_v4_sock_delattr(struct sock *sk)
{
int hdr_delta;
struct ip_options *opt;
struct inet_sock *sk_inet;
sk_inet = inet_sk(sk);
opt = sk_inet->opt;
if (opt == NULL || opt->cipso == 0)
return;
hdr_delta = cipso_v4_delopt(&sk_inet->opt);
if (sk_inet->is_icsk && hdr_delta > 0) {
struct inet_connection_sock *sk_conn = inet_csk(sk);
sk_conn->icsk_ext_hdr_len -= hdr_delta;
@ -2015,6 +2100,27 @@ void cipso_v4_sock_delattr(struct sock *sk)
}
}
/**
* cipso_v4_req_delattr - Delete the CIPSO option from a request socket
* @reg: the request socket
*
* Description:
* Removes the CIPSO option from a request socket, if present.
*
*/
void cipso_v4_req_delattr(struct request_sock *req)
{
struct ip_options *opt;
struct inet_request_sock *req_inet;
req_inet = inet_rsk(req);
opt = req_inet->opt;
if (opt == NULL || opt->cipso == 0)
return;
cipso_v4_delopt(&req_inet->opt);
}
/**
* cipso_v4_getattr - Helper function for the cipso_v4_*_getattr functions
* @cipso: the CIPSO v4 option

9
net/ipv4/syncookies.c
Просмотреть файл

@ -288,10 +288,6 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
if (!req)
goto out;
if (security_inet_conn_request(sk, skb, req)) {
reqsk_free(req);
goto out;
}
ireq = inet_rsk(req);
treq = tcp_rsk(req);
treq->rcv_isn = ntohl(th->seq) - 1;
@ -322,6 +318,11 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
}
}
if (security_inet_conn_request(sk, skb, req)) {
reqsk_free(req);
goto out;
}
req->expires = 0UL;
req->retrans = 0;

7
net/ipv4/tcp_ipv4.c
Просмотреть файл

@ -1230,14 +1230,15 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
tcp_openreq_init(req, &tmp_opt, skb);
if (security_inet_conn_request(sk, skb, req))
goto drop_and_free;
ireq = inet_rsk(req);
ireq->loc_addr = daddr;
ireq->rmt_addr = saddr;
ireq->no_srccheck = inet_sk(sk)->transparent;
ireq->opt = tcp_v4_save_options(sk, skb);
if (security_inet_conn_request(sk, skb, req))
goto drop_and_free;
if (!want_cookie)
TCP_ECN_create_request(req, tcp_hdr(skb));

165
net/netlabel/netlabel_kapi.c
Просмотреть файл

@ -619,8 +619,9 @@ int netlbl_enabled(void)
}
/**
* netlbl_socket_setattr - Label a socket using the correct protocol
* netlbl_sock_setattr - Label a socket using the correct protocol
* @sk: the socket to label
* @family: protocol family
* @secattr: the security attributes
*
* Description:
@ -633,29 +634,45 @@ int netlbl_enabled(void)
*
*/
int netlbl_sock_setattr(struct sock *sk,
u16 family,
const struct netlbl_lsm_secattr *secattr)
{
int ret_val = -ENOENT;
int ret_val;
struct netlbl_dom_map *dom_entry;
rcu_read_lock();
dom_entry = netlbl_domhsh_getentry(secattr->domain);
if (dom_entry == NULL)
if (dom_entry == NULL) {
ret_val = -ENOENT;
goto socket_setattr_return;
switch (dom_entry->type) {
case NETLBL_NLTYPE_ADDRSELECT:
ret_val = -EDESTADDRREQ;
}
switch (family) {
case AF_INET:
switch (dom_entry->type) {
case NETLBL_NLTYPE_ADDRSELECT:
ret_val = -EDESTADDRREQ;
break;
case NETLBL_NLTYPE_CIPSOV4:
ret_val = cipso_v4_sock_setattr(sk,
dom_entry->type_def.cipsov4,
secattr);
break;
case NETLBL_NLTYPE_UNLABELED:
ret_val = 0;
break;
default:
ret_val = -ENOENT;
}
break;
case NETLBL_NLTYPE_CIPSOV4:
ret_val = cipso_v4_sock_setattr(sk,
dom_entry->type_def.cipsov4,
secattr);
break;
case NETLBL_NLTYPE_UNLABELED:
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
case AF_INET6:
/* since we don't support any IPv6 labeling protocols right
* now we can optimize everything away until we do */
ret_val = 0;
break;
#endif /* IPv6 */
default:
ret_val = -ENOENT;
ret_val = -EPROTONOSUPPORT;
}
socket_setattr_return:
@ -689,9 +706,25 @@ void netlbl_sock_delattr(struct sock *sk)
* on failure.
*
*/
int netlbl_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
int netlbl_sock_getattr(struct sock *sk,
struct netlbl_lsm_secattr *secattr)
{
return cipso_v4_sock_getattr(sk, secattr);
int ret_val;
switch (sk->sk_family) {
case AF_INET:
ret_val = cipso_v4_sock_getattr(sk, secattr);
break;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
case AF_INET6:
ret_val = -ENOMSG;
break;
#endif /* IPv6 */
default:
ret_val = -EPROTONOSUPPORT;
}
return ret_val;
}
/**
@ -748,7 +781,7 @@ int netlbl_conn_setattr(struct sock *sk,
break;
#endif /* IPv6 */
default:
ret_val = 0;
ret_val = -EPROTONOSUPPORT;
}
conn_setattr_return:
@ -756,6 +789,90 @@ conn_setattr_return:
return ret_val;
}
/**
* netlbl_req_setattr - Label a request socket using the correct protocol
* @req: the request socket to label
* @secattr: the security attributes
*
* Description:
* Attach the correct label to the given socket using the security attributes
* specified in @secattr. Returns zero on success, negative values on failure.
*
*/
int netlbl_req_setattr(struct request_sock *req,
const struct netlbl_lsm_secattr *secattr)
{
int ret_val;
struct netlbl_dom_map *dom_entry;
struct netlbl_domaddr4_map *af4_entry;
u32 proto_type;
struct cipso_v4_doi *proto_cv4;
rcu_read_lock();
dom_entry = netlbl_domhsh_getentry(secattr->domain);
if (dom_entry == NULL) {
ret_val = -ENOENT;
goto req_setattr_return;
}
switch (req->rsk_ops->family) {
case AF_INET:
if (dom_entry->type == NETLBL_NLTYPE_ADDRSELECT) {
struct inet_request_sock *req_inet = inet_rsk(req);
af4_entry = netlbl_domhsh_getentry_af4(secattr->domain,
req_inet->rmt_addr);
if (af4_entry == NULL) {
ret_val = -ENOENT;
goto req_setattr_return;
}
proto_type = af4_entry->type;
proto_cv4 = af4_entry->type_def.cipsov4;
} else {
proto_type = dom_entry->type;
proto_cv4 = dom_entry->type_def.cipsov4;
}
switch (proto_type) {
case NETLBL_NLTYPE_CIPSOV4:
ret_val = cipso_v4_req_setattr(req, proto_cv4, secattr);
break;
case NETLBL_NLTYPE_UNLABELED:
/* just delete the protocols we support for right now
* but we could remove other protocols if needed */
cipso_v4_req_delattr(req);
ret_val = 0;
break;
default:
ret_val = -ENOENT;
}
break;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
case AF_INET6:
/* since we don't support any IPv6 labeling protocols right
* now we can optimize everything away until we do */
ret_val = 0;
break;
#endif /* IPv6 */
default:
ret_val = -EPROTONOSUPPORT;
}
req_setattr_return:
rcu_read_unlock();
return ret_val;
}
/**
* netlbl_req_delattr - Delete all the NetLabel labels on a socket
* @req: the socket
*
* Description:
* Remove all the NetLabel labeling from @req.
*
*/
void netlbl_req_delattr(struct request_sock *req)
{
cipso_v4_req_delattr(req);
}
/**
* netlbl_skbuff_setattr - Label a packet using the correct protocol
* @skb: the packet
@ -808,7 +925,7 @@ int netlbl_skbuff_setattr(struct sk_buff *skb,
break;
#endif /* IPv6 */
default:
ret_val = 0;
ret_val = -EPROTONOSUPPORT;
}
skbuff_setattr_return:
@ -833,9 +950,17 @@ int netlbl_skbuff_getattr(const struct sk_buff *skb,
u16 family,
struct netlbl_lsm_secattr *secattr)
{
if (CIPSO_V4_OPTEXIST(skb) &&
cipso_v4_skbuff_getattr(skb, secattr) == 0)
return 0;
switch (family) {
case AF_INET:
if (CIPSO_V4_OPTEXIST(skb) &&
cipso_v4_skbuff_getattr(skb, secattr) == 0)
return 0;
break;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
case AF_INET6:
break;
#endif /* IPv6 */
}
return netlbl_unlabel_getattr(skb, family, secattr);
}

2
net/socket.c
Просмотреть файл

@ -1536,8 +1536,6 @@ SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
fd_install(newfd, newfile);
err = newfd;
security_socket_post_accept(sock, newsock);
out_put:
fput_light(sock->file, fput_needed);
out:

5
security/capability.c
Просмотреть файл

@ -620,10 +620,6 @@ static int cap_socket_accept(struct socket *sock, struct socket *newsock)
return 0;
}
static void cap_socket_post_accept(struct socket *sock, struct socket *newsock)
{
}
static int cap_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size)
{
return 0;
@ -1014,7 +1010,6 @@ void security_fixup_ops(struct security_operations *ops)
set_to_cap_if_null(ops, socket_connect);
set_to_cap_if_null(ops, socket_listen);
set_to_cap_if_null(ops, socket_accept);
set_to_cap_if_null(ops, socket_post_accept);
set_to_cap_if_null(ops, socket_sendmsg);
set_to_cap_if_null(ops, socket_recvmsg);
set_to_cap_if_null(ops, socket_getsockname);

5
security/security.c
Просмотреть файл

@ -1007,11 +1007,6 @@ int security_socket_accept(struct socket *sock, struct socket *newsock)
return security_ops->socket_accept(sock, newsock);
}
void security_socket_post_accept(struct socket *sock, struct socket *newsock)
{
security_ops->socket_post_accept(sock, newsock);
}
int security_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size)
{
return security_ops->socket_sendmsg(sock, msg, size);

207
security/selinux/hooks.c
Просмотреть файл

@ -93,7 +93,6 @@
extern unsigned int policydb_loaded_version;
extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
extern int selinux_compat_net;
extern struct security_operations *security_ops;
/* SECMARK reference count */
@ -311,7 +310,7 @@ static int sk_alloc_security(struct sock *sk, int family, gfp_t priority)
ssec->sid = SECINITSID_UNLABELED;
sk->sk_security = ssec;
selinux_netlbl_sk_security_reset(ssec, family);
selinux_netlbl_sk_security_reset(ssec);
return 0;
}
@ -2945,7 +2944,6 @@ static void selinux_inode_getsecid(const struct inode *inode, u32 *secid)
static int selinux_revalidate_file_permission(struct file *file, int mask)
{
const struct cred *cred = current_cred();
int rc;
struct inode *inode = file->f_path.dentry->d_inode;
if (!mask) {
@ -2957,29 +2955,15 @@ static int selinux_revalidate_file_permission(struct file *file, int mask)
if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE))
mask |= MAY_APPEND;
rc = file_has_perm(cred, file,
file_mask_to_av(inode->i_mode, mask));
if (rc)
return rc;
return selinux_netlbl_inode_permission(inode, mask);
return file_has_perm(cred, file,
file_mask_to_av(inode->i_mode, mask));
}
static int selinux_file_permission(struct file *file, int mask)
{
struct inode *inode = file->f_path.dentry->d_inode;
struct file_security_struct *fsec = file->f_security;
struct inode_security_struct *isec = inode->i_security;
u32 sid = current_sid();
if (!mask) {
if (!mask)
/* No permission to check. Existence test. */
return 0;
}
if (sid == fsec->sid && fsec->isid == isec->sid
&& fsec->pseqno == avc_policy_seqno())
return selinux_netlbl_inode_permission(inode, mask);
return selinux_revalidate_file_permission(file, mask);
}
@ -3723,7 +3707,7 @@ static int selinux_socket_post_create(struct socket *sock, int family,
sksec = sock->sk->sk_security;
sksec->sid = isec->sid;
sksec->sclass = isec->sclass;
err = selinux_netlbl_socket_post_create(sock);
err = selinux_netlbl_socket_post_create(sock->sk, family);
}
return err;
@ -3914,13 +3898,7 @@ static int selinux_socket_accept(struct socket *sock, struct socket *newsock)
static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg,
int size)
{
int rc;
rc = socket_has_perm(current, sock, SOCKET__WRITE);
if (rc)
return rc;
return selinux_netlbl_inode_permission(SOCK_INODE(sock), MAY_WRITE);
return socket_has_perm(current, sock, SOCKET__WRITE);
}
static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg,
@ -4040,72 +4018,6 @@ static int selinux_inet_sys_rcv_skb(int ifindex, char *addrp, u16 family,
SECCLASS_NODE, NODE__RECVFROM, ad);
}
static int selinux_sock_rcv_skb_iptables_compat(struct sock *sk,
struct sk_buff *skb,
struct avc_audit_data *ad,
u16 family,
char *addrp)
{
int err;
struct sk_security_struct *sksec = sk->sk_security;
u16 sk_class;
u32 netif_perm, node_perm, recv_perm;
u32 port_sid, node_sid, if_sid, sk_sid;
sk_sid = sksec->sid;
sk_class = sksec->sclass;
switch (sk_class) {
case SECCLASS_UDP_SOCKET:
netif_perm = NETIF__UDP_RECV;
node_perm = NODE__UDP_RECV;
recv_perm = UDP_SOCKET__RECV_MSG;
break;
case SECCLASS_TCP_SOCKET:
netif_perm = NETIF__TCP_RECV;
node_perm = NODE__TCP_RECV;
recv_perm = TCP_SOCKET__RECV_MSG;
break;
case SECCLASS_DCCP_SOCKET:
netif_perm = NETIF__DCCP_RECV;
node_perm = NODE__DCCP_RECV;
recv_perm = DCCP_SOCKET__RECV_MSG;
break;
default:
netif_perm = NETIF__RAWIP_RECV;
node_perm = NODE__RAWIP_RECV;
recv_perm = 0;
break;
}
err = sel_netif_sid(skb->iif, &if_sid);
if (err)
return err;
err = avc_has_perm(sk_sid, if_sid, SECCLASS_NETIF, netif_perm, ad);
if (err)
return err;
err = sel_netnode_sid(addrp, family, &node_sid);
if (err)
return err;
err = avc_has_perm(sk_sid, node_sid, SECCLASS_NODE, node_perm, ad);
if (err)
return err;
if (!recv_perm)
return 0;
err = sel_netport_sid(sk->sk_protocol,
ntohs(ad->u.net.sport), &port_sid);
if (unlikely(err)) {
printk(KERN_WARNING
"SELinux: failure in"
" selinux_sock_rcv_skb_iptables_compat(),"
" network port label not found\n");
return err;
}
return avc_has_perm(sk_sid, port_sid, sk_class, recv_perm, ad);
}
static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
u16 family)
{
@ -4123,14 +4035,12 @@ static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
if (err)
return err;
if (selinux_compat_net)
err = selinux_sock_rcv_skb_iptables_compat(sk, skb, &ad,
family, addrp);
else if (selinux_secmark_enabled())
if (selinux_secmark_enabled()) {
err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET,
PACKET__RECV, &ad);
if (err)
return err;
if (err)
return err;
}
if (selinux_policycap_netpeer) {
err = selinux_skb_peerlbl_sid(skb, family, &peer_sid);
@ -4172,7 +4082,7 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
* to the selinux_sock_rcv_skb_compat() function to deal with the
* special handling. We do this in an attempt to keep this function
* as fast and as clean as possible. */
if (selinux_compat_net || !selinux_policycap_netpeer)
if (!selinux_policycap_netpeer)
return selinux_sock_rcv_skb_compat(sk, skb, family);
secmark_active = selinux_secmark_enabled();
@ -4304,7 +4214,7 @@ static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk)
newssec->peer_sid = ssec->peer_sid;
newssec->sclass = ssec->sclass;
selinux_netlbl_sk_security_reset(newssec, newsk->sk_family);
selinux_netlbl_sk_security_reset(newssec);
}
static void selinux_sk_getsecid(struct sock *sk, u32 *secid)
@ -4348,16 +4258,15 @@ static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb,
if (peersid == SECSID_NULL) {
req->secid = sksec->sid;
req->peer_secid = SECSID_NULL;
return 0;
} else {
err = security_sid_mls_copy(sksec->sid, peersid, &newsid);
if (err)
return err;
req->secid = newsid;
req->peer_secid = peersid;
}
err = security_sid_mls_copy(sksec->sid, peersid, &newsid);
if (err)
return err;
req->secid = newsid;
req->peer_secid = peersid;
return 0;
return selinux_netlbl_inet_conn_request(req, family);
}
static void selinux_inet_csk_clone(struct sock *newsk,
@ -4374,7 +4283,7 @@ static void selinux_inet_csk_clone(struct sock *newsk,
/* We don't need to take any sort of lock here as we are the only
* thread with access to newsksec */
selinux_netlbl_sk_security_reset(newsksec, req->rsk_ops->family);
selinux_netlbl_inet_csk_clone(newsk, req->rsk_ops->family);
}
static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb)
@ -4387,8 +4296,6 @@ static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb)
family = PF_INET;
selinux_skb_peerlbl_sid(skb, family, &sksec->peer_sid);
selinux_netlbl_inet_conn_established(sk, family);
}
static void selinux_req_classify_flow(const struct request_sock *req,
@ -4540,71 +4447,6 @@ static unsigned int selinux_ipv4_output(unsigned int hooknum,
return selinux_ip_output(skb, PF_INET);
}
static int selinux_ip_postroute_iptables_compat(struct sock *sk,
int ifindex,
struct avc_audit_data *ad,
u16 family, char *addrp)
{
int err;
struct sk_security_struct *sksec = sk->sk_security;
u16 sk_class;
u32 netif_perm, node_perm, send_perm;
u32 port_sid, node_sid, if_sid, sk_sid;
sk_sid = sksec->sid;
sk_class = sksec->sclass;
switch (sk_class) {
case SECCLASS_UDP_SOCKET:
netif_perm = NETIF__UDP_SEND;
node_perm = NODE__UDP_SEND;
send_perm = UDP_SOCKET__SEND_MSG;
break;
case SECCLASS_TCP_SOCKET:
netif_perm = NETIF__TCP_SEND;
node_perm = NODE__TCP_SEND;
send_perm = TCP_SOCKET__SEND_MSG;
break;
case SECCLASS_DCCP_SOCKET:
netif_perm = NETIF__DCCP_SEND;
node_perm = NODE__DCCP_SEND;
send_perm = DCCP_SOCKET__SEND_MSG;
break;
default:
netif_perm = NETIF__RAWIP_SEND;
node_perm = NODE__RAWIP_SEND;
send_perm = 0;
break;
}
err = sel_netif_sid(ifindex, &if_sid);
if (err)
return err;
err = avc_has_perm(sk_sid, if_sid, SECCLASS_NETIF, netif_perm, ad);
return err;
err = sel_netnode_sid(addrp, family, &node_sid);
if (err)
return err;
err = avc_has_perm(sk_sid, node_sid, SECCLASS_NODE, node_perm, ad);
if (err)
return err;
if (send_perm != 0)
return 0;
err = sel_netport_sid(sk->sk_protocol,
ntohs(ad->u.net.dport), &port_sid);
if (unlikely(err)) {
printk(KERN_WARNING
"SELinux: failure in"
" selinux_ip_postroute_iptables_compat(),"
" network port label not found\n");
return err;
}
return avc_has_perm(sk_sid, port_sid, sk_class, send_perm, ad);
}
static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb,
int ifindex,
u16 family)
@ -4625,15 +4467,10 @@ static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb,
if (selinux_parse_skb(skb, &ad, &addrp, 0, &proto))
return NF_DROP;
if (selinux_compat_net) {
if (selinux_ip_postroute_iptables_compat(skb->sk, ifindex,
&ad, family, addrp))
return NF_DROP;
} else if (selinux_secmark_enabled()) {
if (selinux_secmark_enabled())
if (avc_has_perm(sksec->sid, skb->secmark,
SECCLASS_PACKET, PACKET__SEND, &ad))
return NF_DROP;
}
if (selinux_policycap_netpeer)
if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto))
@ -4657,7 +4494,7 @@ static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex,
* to the selinux_ip_postroute_compat() function to deal with the
* special handling. We do this in an attempt to keep this function
* as fast and as clean as possible. */
if (selinux_compat_net || !selinux_policycap_netpeer)
if (!selinux_policycap_netpeer)
return selinux_ip_postroute_compat(skb, ifindex, family);
#ifdef CONFIG_XFRM
/* If skb->dst->xfrm is non-NULL then the packet is undergoing an IPsec

29
security/selinux/include/netlabel.h
Просмотреть файл

@ -32,6 +32,7 @@
#include <linux/net.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/request_sock.h>
#include "avc.h"
#include "objsec.h"
@ -42,8 +43,7 @@ void selinux_netlbl_cache_invalidate(void);
void selinux_netlbl_err(struct sk_buff *skb, int error, int gateway);
void selinux_netlbl_sk_security_free(struct sk_security_struct *ssec);
void selinux_netlbl_sk_security_reset(struct sk_security_struct *ssec,
int family);
void selinux_netlbl_sk_security_reset(struct sk_security_struct *ssec);
int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
u16 family,
@ -53,9 +53,9 @@ int selinux_netlbl_skbuff_setsid(struct sk_buff *skb,
u16 family,
u32 sid);
void selinux_netlbl_inet_conn_established(struct sock *sk, u16 family);
int selinux_netlbl_socket_post_create(struct socket *sock);
int selinux_netlbl_inode_permission(struct inode *inode, int mask);
int selinux_netlbl_inet_conn_request(struct request_sock *req, u16 family);
void selinux_netlbl_inet_csk_clone(struct sock *sk, u16 family);
int selinux_netlbl_socket_post_create(struct sock *sk, u16 family);
int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
struct sk_buff *skb,
u16 family,
@ -85,8 +85,7 @@ static inline void selinux_netlbl_sk_security_free(
}
static inline void selinux_netlbl_sk_security_reset(
struct sk_security_struct *ssec,
int family)
struct sk_security_struct *ssec)
{
return;
}
@ -113,17 +112,17 @@ static inline int selinux_netlbl_conn_setsid(struct sock *sk,
return 0;
}
static inline void selinux_netlbl_inet_conn_established(struct sock *sk,
u16 family)
{
return;
}
static inline int selinux_netlbl_socket_post_create(struct socket *sock)
static inline int selinux_netlbl_inet_conn_request(struct request_sock *req,
u16 family)
{
return 0;
}
static inline int selinux_netlbl_inode_permission(struct inode *inode,
int mask)
static inline void selinux_netlbl_inet_csk_clone(struct sock *sk, u16 family)
{
return;
}
static inline int selinux_netlbl_socket_post_create(struct sock *sk,
u16 family)
{
return 0;
}

192
security/selinux/netlabel.c
Просмотреть файл

@ -99,41 +99,6 @@ static struct netlbl_lsm_secattr *selinux_netlbl_sock_genattr(struct sock *sk)
return secattr;
}
/**
* selinux_netlbl_sock_setsid - Label a socket using the NetLabel mechanism
* @sk: the socket to label
*
* Description:
* Attempt to label a socket using the NetLabel mechanism. Returns zero values
* on success, negative values on failure.
*
*/
static int selinux_netlbl_sock_setsid(struct sock *sk)
{
int rc;
struct sk_security_struct *sksec = sk->sk_security;
struct netlbl_lsm_secattr *secattr;
if (sksec->nlbl_state != NLBL_REQUIRE)
return 0;
secattr = selinux_netlbl_sock_genattr(sk);
if (secattr == NULL)
return -ENOMEM;
rc = netlbl_sock_setattr(sk, secattr);
switch (rc) {
case 0:
sksec->nlbl_state = NLBL_LABELED;
break;
case -EDESTADDRREQ:
sksec->nlbl_state = NLBL_REQSKB;
rc = 0;
break;
}
return rc;
}
/**
* selinux_netlbl_cache_invalidate - Invalidate the NetLabel cache
*
@ -188,13 +153,9 @@ void selinux_netlbl_sk_security_free(struct sk_security_struct *ssec)
* The caller is responsibile for all the NetLabel sk_security_struct locking.
*
*/
void selinux_netlbl_sk_security_reset(struct sk_security_struct *ssec,
int family)
void selinux_netlbl_sk_security_reset(struct sk_security_struct *ssec)
{
if (family == PF_INET)
ssec->nlbl_state = NLBL_REQUIRE;
else
ssec->nlbl_state = NLBL_UNSET;
ssec->nlbl_state = NLBL_UNSET;
}
/**
@ -281,127 +242,86 @@ skbuff_setsid_return:
}
/**
* selinux_netlbl_inet_conn_established - Netlabel the newly accepted connection
* @sk: the new connection
* selinux_netlbl_inet_conn_request - Label an incoming stream connection
* @req: incoming connection request socket
*
* Description:
* A new connection has been established on @sk so make sure it is labeled
* correctly with the NetLabel susbsystem.
* A new incoming connection request is represented by @req, we need to label
* the new request_sock here and the stack will ensure the on-the-wire label
* will get preserved when a full sock is created once the connection handshake
* is complete. Returns zero on success, negative values on failure.
*
*/
void selinux_netlbl_inet_conn_established(struct sock *sk, u16 family)
int selinux_netlbl_inet_conn_request(struct request_sock *req, u16 family)
{
int rc;
struct netlbl_lsm_secattr secattr;
if (family != PF_INET)
return 0;
netlbl_secattr_init(&secattr);
rc = security_netlbl_sid_to_secattr(req->secid, &secattr);
if (rc != 0)
goto inet_conn_request_return;
rc = netlbl_req_setattr(req, &secattr);
inet_conn_request_return:
netlbl_secattr_destroy(&secattr);
return rc;
}
/**
* selinux_netlbl_inet_csk_clone - Initialize the newly created sock
* @sk: the new sock
*
* Description:
* A new connection has been established using @sk, we've already labeled the
* socket via the request_sock struct in selinux_netlbl_inet_conn_request() but
* we need to set the NetLabel state here since we now have a sock structure.
*
*/
void selinux_netlbl_inet_csk_clone(struct sock *sk, u16 family)
{
struct sk_security_struct *sksec = sk->sk_security;
struct netlbl_lsm_secattr *secattr;
struct inet_sock *sk_inet = inet_sk(sk);
struct sockaddr_in addr;
if (sksec->nlbl_state != NLBL_REQUIRE)
return;
secattr = selinux_netlbl_sock_genattr(sk);
if (secattr == NULL)
return;
rc = netlbl_sock_setattr(sk, secattr);
switch (rc) {
case 0:
if (family == PF_INET)
sksec->nlbl_state = NLBL_LABELED;
break;
case -EDESTADDRREQ:
/* no PF_INET6 support yet because we don't support any IPv6
* labeling protocols */
if (family != PF_INET) {
sksec->nlbl_state = NLBL_UNSET;
return;
}
addr.sin_family = family;
addr.sin_addr.s_addr = sk_inet->daddr;
if (netlbl_conn_setattr(sk, (struct sockaddr *)&addr,
secattr) != 0) {
/* we failed to label the connected socket (could be
* for a variety of reasons, the actual "why" isn't
* important here) so we have to go to our backup plan,
* labeling the packets individually in the netfilter
* local output hook. this is okay but we need to
* adjust the MSS of the connection to take into
* account any labeling overhead, since we don't know
* the exact overhead at this point we'll use the worst
* case value which is 40 bytes for IPv4 */
struct inet_connection_sock *sk_conn = inet_csk(sk);
sk_conn->icsk_ext_hdr_len += 40 -
(sk_inet->opt ? sk_inet->opt->optlen : 0);
sk_conn->icsk_sync_mss(sk, sk_conn->icsk_pmtu_cookie);
sksec->nlbl_state = NLBL_REQSKB;
} else
sksec->nlbl_state = NLBL_CONNLABELED;
break;
default:
/* note that we are failing to label the socket which could be
* a bad thing since it means traffic could leave the system
* without the desired labeling, however, all is not lost as
* we have a check in selinux_netlbl_inode_permission() to
* pick up the pieces that we might drop here because we can't
* return an error code */
break;
}
else
sksec->nlbl_state = NLBL_UNSET;
}
/**
* selinux_netlbl_socket_post_create - Label a socket using NetLabel
* @sock: the socket to label
* @family: protocol family
*
* Description:
* Attempt to label a socket using the NetLabel mechanism using the given
* SID. Returns zero values on success, negative values on failure.
*
*/
int selinux_netlbl_socket_post_create(struct socket *sock)
{
return selinux_netlbl_sock_setsid(sock->sk);
}
/**
* selinux_netlbl_inode_permission - Verify the socket is NetLabel labeled
* @inode: the file descriptor's inode
* @mask: the permission mask
*
* Description:
* Looks at a file's inode and if it is marked as a socket protected by
* NetLabel then verify that the socket has been labeled, if not try to label
* the socket now with the inode's SID. Returns zero on success, negative
* values on failure.
*
*/
int selinux_netlbl_inode_permission(struct inode *inode, int mask)
int selinux_netlbl_socket_post_create(struct sock *sk, u16 family)
{
int rc;
struct sock *sk;
struct socket *sock;
struct sk_security_struct *sksec;
struct sk_security_struct *sksec = sk->sk_security;
struct netlbl_lsm_secattr *secattr;
if (!S_ISSOCK(inode->i_mode) ||
((mask & (MAY_WRITE | MAY_APPEND)) == 0))
return 0;
sock = SOCKET_I(inode);
sk = sock->sk;
if (sk == NULL)
return 0;
sksec = sk->sk_security;
if (sksec == NULL || sksec->nlbl_state != NLBL_REQUIRE)
if (family != PF_INET)
return 0;
local_bh_disable();
bh_lock_sock_nested(sk);
if (likely(sksec->nlbl_state == NLBL_REQUIRE))
rc = selinux_netlbl_sock_setsid(sk);
else
secattr = selinux_netlbl_sock_genattr(sk);
if (secattr == NULL)
return -ENOMEM;
rc = netlbl_sock_setattr(sk, family, secattr);
switch (rc) {
case 0:
sksec->nlbl_state = NLBL_LABELED;
break;
case -EDESTADDRREQ:
sksec->nlbl_state = NLBL_REQSKB;
rc = 0;
bh_unlock_sock(sk);
local_bh_enable();
break;
}
return rc;
}

68
security/selinux/selinuxfs.c
Просмотреть файл

@ -47,8 +47,6 @@ static char *policycap_names[] = {
unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
int selinux_compat_net = 0;
static int __init checkreqprot_setup(char *str)
{
unsigned long checkreqprot;
@ -58,16 +56,6 @@ static int __init checkreqprot_setup(char *str)
}
__setup("checkreqprot=", checkreqprot_setup);
static int __init selinux_compat_net_setup(char *str)
{
unsigned long compat_net;
if (!strict_strtoul(str, 0, &compat_net))
selinux_compat_net = compat_net ? 1 : 0;
return 1;
}
__setup("selinux_compat_net=", selinux_compat_net_setup);
static DEFINE_MUTEX(sel_mutex);
/* global data for booleans */
@ -450,61 +438,6 @@ static const struct file_operations sel_checkreqprot_ops = {
.write = sel_write_checkreqprot,
};
static ssize_t sel_read_compat_net(struct file *filp, char __user *buf,
size_t count, loff_t *ppos)
{
char tmpbuf[TMPBUFLEN];
ssize_t length;
length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net);
return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
}
static ssize_t sel_write_compat_net(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
char *page;
ssize_t length;
int new_value;
length = task_has_security(current, SECURITY__LOAD_POLICY);
if (length)
return length;
if (count >= PAGE_SIZE)
return -ENOMEM;
if (*ppos != 0) {
/* No partial writes. */
return -EINVAL;
}
page = (char *)get_zeroed_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
length = -EFAULT;
if (copy_from_user(page, buf, count))
goto out;
length = -EINVAL;
if (sscanf(page, "%d", &new_value) != 1)
goto out;
if (new_value) {
printk(KERN_NOTICE
"SELinux: compat_net is deprecated, please use secmark"
" instead\n");
selinux_compat_net = 1;
} else
selinux_compat_net = 0;
length = count;
out:
free_page((unsigned long) page);
return length;
}
static const struct file_operations sel_compat_net_ops = {
.read = sel_read_compat_net,
.write = sel_write_compat_net,
};
/*
* Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
*/
@ -1665,7 +1598,6 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent)
[SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
[SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
[SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
[SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
[SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
[SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
/* last one */ {""}

32
security/smack/smack.h
Просмотреть файл

@ -18,6 +18,8 @@
#include <linux/security.h>
#include <linux/in.h>
#include <net/netlabel.h>
#include <linux/list.h>
#include <linux/rculist.h>
/*
* Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
@ -40,7 +42,6 @@ struct superblock_smack {
struct socket_smack {
char *smk_out; /* outbound label */
char *smk_in; /* inbound label */
int smk_labeled; /* label scheme */
char smk_packet[SMK_LABELLEN]; /* TCP peer label */
};
@ -59,17 +60,10 @@ struct inode_smack {
* A label access rule.
*/
struct smack_rule {
char *smk_subject;
char *smk_object;
int smk_access;
};
/*
* An entry in the table of permitted label accesses.
*/
struct smk_list_entry {
struct smk_list_entry *smk_next;
struct smack_rule smk_rule;
struct list_head list;
char *smk_subject;
char *smk_object;
int smk_access;
};
/*
@ -85,7 +79,7 @@ struct smack_cipso {
* An entry in the table identifying hosts.
*/
struct smk_netlbladdr {
struct smk_netlbladdr *smk_next;
struct list_head list;
struct sockaddr_in smk_host; /* network address */
struct in_addr smk_mask; /* network mask */
char *smk_label; /* label */
@ -113,7 +107,7 @@ struct smk_netlbladdr {
* the cipso direct mapping in used internally.
*/
struct smack_known {
struct smack_known *smk_next;
struct list_head list;
char smk_known[SMK_LABELLEN];
u32 smk_secid;
struct smack_cipso *smk_cipso;
@ -138,6 +132,8 @@ struct smack_known {
#define XATTR_NAME_SMACKIPIN XATTR_SECURITY_PREFIX XATTR_SMACK_IPIN
#define XATTR_NAME_SMACKIPOUT XATTR_SECURITY_PREFIX XATTR_SMACK_IPOUT
#define SMACK_CIPSO_OPTION "-CIPSO"
/*
* How communications on this socket are treated.
* Usually it's determined by the underlying netlabel code
@ -205,8 +201,8 @@ u32 smack_to_secid(const char *);
extern int smack_cipso_direct;
extern char *smack_net_ambient;
extern char *smack_onlycap;
extern const char *smack_cipso_option;
extern struct smack_known *smack_known;
extern struct smack_known smack_known_floor;
extern struct smack_known smack_known_hat;
extern struct smack_known smack_known_huh;
@ -214,8 +210,10 @@ extern struct smack_known smack_known_invalid;
extern struct smack_known smack_known_star;
extern struct smack_known smack_known_web;
extern struct smk_list_entry *smack_list;
extern struct smk_netlbladdr *smack_netlbladdrs;
extern struct list_head smack_known_list;
extern struct list_head smack_rule_list;
extern struct list_head smk_netlbladdr_list;
extern struct security_operations smack_ops;
/*

66
security/smack/smack_access.c
Просмотреть файл

@ -16,48 +16,42 @@
#include "smack.h"
struct smack_known smack_known_huh = {
.smk_next = NULL,
.smk_known = "?",
.smk_secid = 2,
.smk_cipso = NULL,
};
struct smack_known smack_known_hat = {
.smk_next = &smack_known_huh,
.smk_known = "^",
.smk_secid = 3,
.smk_cipso = NULL,
};
struct smack_known smack_known_star = {
.smk_next = &smack_known_hat,
.smk_known = "*",
.smk_secid = 4,
.smk_cipso = NULL,
};
struct smack_known smack_known_floor = {
.smk_next = &smack_known_star,
.smk_known = "_",
.smk_secid = 5,
.smk_cipso = NULL,
};
struct smack_known smack_known_invalid = {
.smk_next = &smack_known_floor,
.smk_known = "",
.smk_secid = 6,
.smk_cipso = NULL,
};
struct smack_known smack_known_web = {
.smk_next = &smack_known_invalid,
.smk_known = "@",
.smk_secid = 7,
.smk_cipso = NULL,
};
struct smack_known *smack_known = &smack_known_web;
LIST_HEAD(smack_known_list);
/*
* The initial value needs to be bigger than any of the
@ -87,7 +81,6 @@ static u32 smack_next_secid = 10;
int smk_access(char *subject_label, char *object_label, int request)
{
u32 may = MAY_NOT;
struct smk_list_entry *sp;
struct smack_rule *srp;
/*
@ -139,9 +132,8 @@ int smk_access(char *subject_label, char *object_label, int request)
* access (e.g. read is included in readwrite) it's
* good.
*/
for (sp = smack_list; sp != NULL; sp = sp->smk_next) {
srp = &sp->smk_rule;
rcu_read_lock();
list_for_each_entry_rcu(srp, &smack_rule_list, list) {
if (srp->smk_subject == subject_label ||
strcmp(srp->smk_subject, subject_label) == 0) {
if (srp->smk_object == object_label ||
@ -151,6 +143,7 @@ int smk_access(char *subject_label, char *object_label, int request)
}
}
}
rcu_read_unlock();
/*
* This is a bit map operation.
*/
@ -228,14 +221,17 @@ struct smack_known *smk_import_entry(const char *string, int len)
mutex_lock(&smack_known_lock);
for (skp = smack_known; skp != NULL; skp = skp->smk_next)
if (strncmp(skp->smk_known, smack, SMK_MAXLEN) == 0)
found = 0;
list_for_each_entry_rcu(skp, &smack_known_list, list) {
if (strncmp(skp->smk_known, smack, SMK_MAXLEN) == 0) {
found = 1;
break;
}
}
if (skp == NULL) {
if (found == 0) {
skp = kzalloc(sizeof(struct smack_known), GFP_KERNEL);
if (skp != NULL) {
skp->smk_next = smack_known;
strncpy(skp->smk_known, smack, SMK_MAXLEN);
skp->smk_secid = smack_next_secid++;
skp->smk_cipso = NULL;
@ -244,8 +240,7 @@ struct smack_known *smk_import_entry(const char *string, int len)
* Make sure that the entry is actually
* filled before putting it on the list.
*/
smp_mb();
smack_known = skp;
list_add_rcu(&skp->list, &smack_known_list);
}
}
@ -266,6 +261,9 @@ char *smk_import(const char *string, int len)
{
struct smack_known *skp;
/* labels cannot begin with a '-' */
if (string[0] == '-')
return NULL;
skp = smk_import_entry(string, len);
if (skp == NULL)
return NULL;
@ -283,14 +281,19 @@ char *smack_from_secid(const u32 secid)
{
struct smack_known *skp;
for (skp = smack_known; skp != NULL; skp = skp->smk_next)
if (skp->smk_secid == secid)
rcu_read_lock();
list_for_each_entry_rcu(skp, &smack_known_list, list) {
if (skp->smk_secid == secid) {
rcu_read_unlock();
return skp->smk_known;
}
}
/*
* If we got this far someone asked for the translation
* of a secid that is not on the list.
*/
rcu_read_unlock();
return smack_known_invalid.smk_known;
}
@ -305,9 +308,14 @@ u32 smack_to_secid(const char *smack)
{
struct smack_known *skp;
for (skp = smack_known; skp != NULL; skp = skp->smk_next)
if (strncmp(skp->smk_known, smack, SMK_MAXLEN) == 0)
rcu_read_lock();
list_for_each_entry_rcu(skp, &smack_known_list, list) {
if (strncmp(skp->smk_known, smack, SMK_MAXLEN) == 0) {
rcu_read_unlock();
return skp->smk_secid;
}
}
rcu_read_unlock();
return 0;
}
@ -332,7 +340,8 @@ void smack_from_cipso(u32 level, char *cp, char *result)
struct smack_known *kp;
char *final = NULL;
for (kp = smack_known; final == NULL && kp != NULL; kp = kp->smk_next) {
rcu_read_lock();
list_for_each_entry(kp, &smack_known_list, list) {
if (kp->smk_cipso == NULL)
continue;
@ -344,6 +353,7 @@ void smack_from_cipso(u32 level, char *cp, char *result)
spin_unlock_bh(&kp->smk_cipsolock);
}
rcu_read_unlock();
if (final == NULL)
final = smack_known_huh.smk_known;
strncpy(result, final, SMK_MAXLEN);
@ -360,13 +370,19 @@ void smack_from_cipso(u32 level, char *cp, char *result)
int smack_to_cipso(const char *smack, struct smack_cipso *cp)
{
struct smack_known *kp;
int found = 0;
for (kp = smack_known; kp != NULL; kp = kp->smk_next)
rcu_read_lock();
list_for_each_entry_rcu(kp, &smack_known_list, list) {
if (kp->smk_known == smack ||
strcmp(kp->smk_known, smack) == 0)
strcmp(kp->smk_known, smack) == 0) {
found = 1;
break;
}
}
rcu_read_unlock();
if (kp == NULL || kp->smk_cipso == NULL)
if (found == 0 || kp->smk_cipso == NULL)
return -ENOENT;
memcpy(cp, kp->smk_cipso, sizeof(struct smack_cipso));

282
security/smack/smack_lsm.c
Просмотреть файл

@ -7,6 +7,8 @@
* Casey Schaufler <casey@schaufler-ca.com>
*
* Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
* Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
* Paul Moore <paul.moore@hp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2,
@ -20,6 +22,7 @@
#include <linux/ext2_fs.h>
#include <linux/kd.h>
#include <asm/ioctls.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/mutex.h>
@ -606,6 +609,9 @@ static int smack_inode_setxattr(struct dentry *dentry, const char *name,
strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
if (!capable(CAP_MAC_ADMIN))
rc = -EPERM;
/* a label cannot be void and cannot begin with '-' */
if (size == 0 || (size > 0 && ((char *)value)[0] == '-'))
rc = -EINVAL;
} else
rc = cap_inode_setxattr(dentry, name, value, size, flags);
@ -1275,7 +1281,6 @@ static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
ssp->smk_in = csp;
ssp->smk_out = csp;
ssp->smk_labeled = SMACK_CIPSO_SOCKET;
ssp->smk_packet[0] = '\0';
sk->sk_security = ssp;
@ -1294,6 +1299,43 @@ static void smack_sk_free_security(struct sock *sk)
kfree(sk->sk_security);
}
/**
* smack_host_label - check host based restrictions
* @sip: the object end
*
* looks for host based access restrictions
*
* This version will only be appropriate for really small sets of single label
* hosts. The caller is responsible for ensuring that the RCU read lock is
* taken before calling this function.
*
* Returns the label of the far end or NULL if it's not special.
*/
static char *smack_host_label(struct sockaddr_in *sip)
{
struct smk_netlbladdr *snp;
struct in_addr *siap = &sip->sin_addr;
if (siap->s_addr == 0)
return NULL;
list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list)
/*
* we break after finding the first match because
* the list is sorted from longest to shortest mask
* so we have found the most specific match
*/
if ((&snp->smk_host.sin_addr)->s_addr ==
(siap->s_addr & (&snp->smk_mask)->s_addr)) {
/* we have found the special CIPSO option */
if (snp->smk_label == smack_cipso_option)
return NULL;
return snp->smk_label;
}
return NULL;
}
/**
* smack_set_catset - convert a capset to netlabel mls categories
* @catset: the Smack categories
@ -1365,11 +1407,10 @@ static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp)
*/
static int smack_netlabel(struct sock *sk, int labeled)
{
struct socket_smack *ssp;
struct socket_smack *ssp = sk->sk_security;
struct netlbl_lsm_secattr secattr;
int rc = 0;
ssp = sk->sk_security;
/*
* Usually the netlabel code will handle changing the
* packet labeling based on the label.
@ -1387,26 +1428,50 @@ static int smack_netlabel(struct sock *sk, int labeled)
else {
netlbl_secattr_init(&secattr);
smack_to_secattr(ssp->smk_out, &secattr);
rc = netlbl_sock_setattr(sk, &secattr);
rc = netlbl_sock_setattr(sk, sk->sk_family, &secattr);
netlbl_secattr_destroy(&secattr);
}
bh_unlock_sock(sk);
local_bh_enable();
/*
* Remember the label scheme used so that it is not
* necessary to do the netlabel setting if it has not
* changed the next time through.
*
* The -EDESTADDRREQ case is an indication that there's
* a single level host involved.
*/
if (rc == 0)
ssp->smk_labeled = labeled;
return rc;
}
/**
* smack_netlbel_send - Set the secattr on a socket and perform access checks
* @sk: the socket
* @sap: the destination address
*
* Set the correct secattr for the given socket based on the destination
* address and perform any outbound access checks needed.
*
* Returns 0 on success or an error code.
*
*/
static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
{
int rc;
int sk_lbl;
char *hostsp;
struct socket_smack *ssp = sk->sk_security;
rcu_read_lock();
hostsp = smack_host_label(sap);
if (hostsp != NULL) {
sk_lbl = SMACK_UNLABELED_SOCKET;
rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE);
} else {
sk_lbl = SMACK_CIPSO_SOCKET;
rc = 0;
}
rcu_read_unlock();
if (rc != 0)
return rc;
return smack_netlabel(sk, sk_lbl);
}
/**
* smack_inode_setsecurity - set smack xattrs
* @inode: the object
@ -1428,7 +1493,7 @@ static int smack_inode_setsecurity(struct inode *inode, const char *name,
struct socket *sock;
int rc = 0;
if (value == NULL || size > SMK_LABELLEN)
if (value == NULL || size > SMK_LABELLEN || size == 0)
return -EACCES;
sp = smk_import(value, size);
@ -1488,41 +1553,6 @@ static int smack_socket_post_create(struct socket *sock, int family,
return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
}
/**
* smack_host_label - check host based restrictions
* @sip: the object end
*
* looks for host based access restrictions
*
* This version will only be appropriate for really small
* sets of single label hosts.
*
* Returns the label of the far end or NULL if it's not special.
*/
static char *smack_host_label(struct sockaddr_in *sip)
{
struct smk_netlbladdr *snp;
struct in_addr *siap = &sip->sin_addr;
if (siap->s_addr == 0)
return NULL;
for (snp = smack_netlbladdrs; snp != NULL; snp = snp->smk_next) {
/*
* we break after finding the first match because
* the list is sorted from longest to shortest mask
* so we have found the most specific match
*/
if ((&snp->smk_host.sin_addr)->s_addr ==
(siap->s_addr & (&snp->smk_mask)->s_addr)) {
return snp->smk_label;
}
}
return NULL;
}
/**
* smack_socket_connect - connect access check
* @sock: the socket
@ -1536,30 +1566,12 @@ static char *smack_host_label(struct sockaddr_in *sip)
static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
int addrlen)
{
struct socket_smack *ssp = sock->sk->sk_security;
char *hostsp;
int rc;
if (sock->sk == NULL || sock->sk->sk_family != PF_INET)
return 0;
if (addrlen < sizeof(struct sockaddr_in))
return -EINVAL;
hostsp = smack_host_label((struct sockaddr_in *)sap);
if (hostsp == NULL) {
if (ssp->smk_labeled != SMACK_CIPSO_SOCKET)
return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
return 0;
}
rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE);
if (rc != 0)
return rc;
if (ssp->smk_labeled != SMACK_UNLABELED_SOCKET)
return smack_netlabel(sock->sk, SMACK_UNLABELED_SOCKET);
return 0;
return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
}
/**
@ -2260,9 +2272,6 @@ static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
int size)
{
struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
struct socket_smack *ssp = sock->sk->sk_security;
char *hostsp;
int rc;
/*
* Perfectly reasonable for this to be NULL
@ -2270,22 +2279,7 @@ static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
if (sip == NULL || sip->sin_family != PF_INET)
return 0;
hostsp = smack_host_label(sip);
if (hostsp == NULL) {
if (ssp->smk_labeled != SMACK_CIPSO_SOCKET)
return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
return 0;
}
rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE);
if (rc != 0)
return rc;
if (ssp->smk_labeled != SMACK_UNLABELED_SOCKET)
return smack_netlabel(sock->sk, SMACK_UNLABELED_SOCKET);
return 0;
return smack_netlabel_send(sock->sk, sip);
}
@ -2490,31 +2484,24 @@ static int smack_socket_getpeersec_dgram(struct socket *sock,
}
/**
* smack_sock_graft - graft access state between two sockets
* @sk: fresh sock
* @parent: donor socket
* smack_sock_graft - Initialize a newly created socket with an existing sock
* @sk: child sock
* @parent: parent socket
*
* Sets the netlabel socket state on sk from parent
* Set the smk_{in,out} state of an existing sock based on the process that
* is creating the new socket.
*/
static void smack_sock_graft(struct sock *sk, struct socket *parent)
{
struct socket_smack *ssp;
int rc;
if (sk == NULL)
return;
if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
if (sk == NULL ||
(sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
return;
ssp = sk->sk_security;
ssp->smk_in = ssp->smk_out = current_security();
ssp->smk_packet[0] = '\0';
rc = smack_netlabel(sk, SMACK_CIPSO_SOCKET);
if (rc != 0)
printk(KERN_WARNING "Smack: \"%s\" netlbl error %d.\n",
__func__, -rc);
/* cssp->smk_packet is already set in smack_inet_csk_clone() */
}
/**
@ -2529,35 +2516,82 @@ static void smack_sock_graft(struct sock *sk, struct socket *parent)
static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
struct request_sock *req)
{
struct netlbl_lsm_secattr skb_secattr;
u16 family = sk->sk_family;
struct socket_smack *ssp = sk->sk_security;
struct netlbl_lsm_secattr secattr;
struct sockaddr_in addr;
struct iphdr *hdr;
char smack[SMK_LABELLEN];
int rc;
if (skb == NULL)
return -EACCES;
/* handle mapped IPv4 packets arriving via IPv6 sockets */
if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
family = PF_INET;
netlbl_secattr_init(&skb_secattr);
rc = netlbl_skbuff_getattr(skb, sk->sk_family, &skb_secattr);
netlbl_secattr_init(&secattr);
rc = netlbl_skbuff_getattr(skb, family, &secattr);
if (rc == 0)
smack_from_secattr(&skb_secattr, smack);
smack_from_secattr(&secattr, smack);
else
strncpy(smack, smack_known_huh.smk_known, SMK_MAXLEN);
netlbl_secattr_destroy(&skb_secattr);
netlbl_secattr_destroy(&secattr);
/*
* Receiving a packet requires that the other end
* be able to write here. Read access is not required.
*
* If the request is successful save the peer's label
* so that SO_PEERCRED can report it.
* Receiving a packet requires that the other end be able to write
* here. Read access is not required.
*/
rc = smk_access(smack, ssp->smk_in, MAY_WRITE);
if (rc == 0)
strncpy(ssp->smk_packet, smack, SMK_MAXLEN);
if (rc != 0)
return rc;
/*
* Save the peer's label in the request_sock so we can later setup
* smk_packet in the child socket so that SO_PEERCRED can report it.
*/
req->peer_secid = smack_to_secid(smack);
/*
* We need to decide if we want to label the incoming connection here
* if we do we only need to label the request_sock and the stack will
* propogate the wire-label to the sock when it is created.
*/
hdr = ip_hdr(skb);
addr.sin_addr.s_addr = hdr->saddr;
rcu_read_lock();
if (smack_host_label(&addr) == NULL) {
rcu_read_unlock();
netlbl_secattr_init(&secattr);
smack_to_secattr(smack, &secattr);
rc = netlbl_req_setattr(req, &secattr);
netlbl_secattr_destroy(&secattr);
} else {
rcu_read_unlock();
netlbl_req_delattr(req);
}
return rc;
}
/**
* smack_inet_csk_clone - Copy the connection information to the new socket
* @sk: the new socket
* @req: the connection's request_sock
*
* Transfer the connection's peer label to the newly created socket.
*/
static void smack_inet_csk_clone(struct sock *sk,
const struct request_sock *req)
{
struct socket_smack *ssp = sk->sk_security;
char *smack;
if (req->peer_secid != 0) {
smack = smack_from_secid(req->peer_secid);
strncpy(ssp->smk_packet, smack, SMK_MAXLEN);
} else
ssp->smk_packet[0] = '\0';
}
/*
* Key management security hooks
*
@ -2909,6 +2943,7 @@ struct security_operations smack_ops = {
.sk_free_security = smack_sk_free_security,
.sock_graft = smack_sock_graft,
.inet_conn_request = smack_inet_conn_request,
.inet_csk_clone = smack_inet_csk_clone,
/* key management security hooks */
#ifdef CONFIG_KEYS
@ -2930,6 +2965,17 @@ struct security_operations smack_ops = {
.release_secctx = smack_release_secctx,
};
static __init void init_smack_know_list(void)
{
list_add(&smack_known_huh.list, &smack_known_list);
list_add(&smack_known_hat.list, &smack_known_list);
list_add(&smack_known_star.list, &smack_known_list);
list_add(&smack_known_floor.list, &smack_known_list);
list_add(&smack_known_invalid.list, &smack_known_list);
list_add(&smack_known_web.list, &smack_known_list);
}
/**
* smack_init - initialize the smack system
*
@ -2950,6 +2996,8 @@ static __init int smack_init(void)
cred = (struct cred *) current->cred;
cred->security = &smack_known_floor.smk_known;
/* initilize the smack_know_list */
init_smack_know_list();
/*
* Initialize locks
*/

218
security/smack/smackfs.c
Просмотреть файл

@ -80,10 +80,14 @@ char *smack_onlycap;
* Packets are sent there unlabeled, but only from tasks that
* can write to the specified label.
*/
struct smk_netlbladdr *smack_netlbladdrs;
LIST_HEAD(smk_netlbladdr_list);
LIST_HEAD(smack_rule_list);
static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
struct smk_list_entry *smack_list;
const char *smack_cipso_option = SMACK_CIPSO_OPTION;
#define SEQ_READ_FINISHED 1
@ -134,24 +138,27 @@ static void *load_seq_start(struct seq_file *s, loff_t *pos)
{
if (*pos == SEQ_READ_FINISHED)
return NULL;
return smack_list;
if (list_empty(&smack_rule_list))
return NULL;
return smack_rule_list.next;
}
static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
struct smk_list_entry *skp = ((struct smk_list_entry *) v)->smk_next;
struct list_head *list = v;
if (skp == NULL)
if (list_is_last(list, &smack_rule_list)) {
*pos = SEQ_READ_FINISHED;
return skp;
return NULL;
}
return list->next;
}
static int load_seq_show(struct seq_file *s, void *v)
{
struct smk_list_entry *slp = (struct smk_list_entry *) v;
struct smack_rule *srp = &slp->smk_rule;
struct list_head *list = v;
struct smack_rule *srp =
list_entry(list, struct smack_rule, list);
seq_printf(s, "%s %s", (char *)srp->smk_subject,
(char *)srp->smk_object);
@ -212,32 +219,23 @@ static int smk_open_load(struct inode *inode, struct file *file)
*/
static int smk_set_access(struct smack_rule *srp)
{
struct smk_list_entry *sp;
struct smk_list_entry *newp;
struct smack_rule *sp;
int ret = 0;
int found;
mutex_lock(&smack_list_lock);
for (sp = smack_list; sp != NULL; sp = sp->smk_next)
if (sp->smk_rule.smk_subject == srp->smk_subject &&
sp->smk_rule.smk_object == srp->smk_object) {
sp->smk_rule.smk_access = srp->smk_access;
found = 0;
list_for_each_entry_rcu(sp, &smack_rule_list, list) {
if (sp->smk_subject == srp->smk_subject &&
sp->smk_object == srp->smk_object) {
found = 1;
sp->smk_access = srp->smk_access;
break;
}
if (sp == NULL) {
newp = kzalloc(sizeof(struct smk_list_entry), GFP_KERNEL);
if (newp == NULL) {
ret = -ENOMEM;
goto out;
}
newp->smk_rule = *srp;
newp->smk_next = smack_list;
smack_list = newp;
}
if (found == 0)
list_add_rcu(&srp->list, &smack_rule_list);
out:
mutex_unlock(&smack_list_lock);
return ret;
@ -261,7 +259,7 @@ out:
static ssize_t smk_write_load(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct smack_rule rule;
struct smack_rule *rule;
char *data;
int rc = -EINVAL;
@ -272,9 +270,8 @@ static ssize_t smk_write_load(struct file *file, const char __user *buf,
*/
if (!capable(CAP_MAC_ADMIN))
return -EPERM;
if (*ppos != 0)
return -EINVAL;
if (count != SMK_LOADLEN)
if (*ppos != 0 || count != SMK_LOADLEN)
return -EINVAL;
data = kzalloc(count, GFP_KERNEL);
@ -286,25 +283,31 @@ static ssize_t smk_write_load(struct file *file, const char __user *buf,
goto out;
}
rule.smk_subject = smk_import(data, 0);
if (rule.smk_subject == NULL)
rule = kzalloc(sizeof(*rule), GFP_KERNEL);
if (rule == NULL) {
rc = -ENOMEM;
goto out;
}
rule.smk_object = smk_import(data + SMK_LABELLEN, 0);
if (rule.smk_object == NULL)
goto out;
rule->smk_subject = smk_import(data, 0);
if (rule->smk_subject == NULL)
goto out_free_rule;
rule.smk_access = 0;
rule->smk_object = smk_import(data + SMK_LABELLEN, 0);
if (rule->smk_object == NULL)
goto out_free_rule;
rule->smk_access = 0;
switch (data[SMK_LABELLEN + SMK_LABELLEN]) {
case '-':
break;
case 'r':
case 'R':
rule.smk_access |= MAY_READ;
rule->smk_access |= MAY_READ;
break;
default:
goto out;
goto out_free_rule;
}
switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) {
@ -312,10 +315,10 @@ static ssize_t smk_write_load(struct file *file, const char __user *buf,
break;
case 'w':
case 'W':
rule.smk_access |= MAY_WRITE;
rule->smk_access |= MAY_WRITE;
break;
default:
goto out;
goto out_free_rule;
}
switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) {
@ -323,10 +326,10 @@ static ssize_t smk_write_load(struct file *file, const char __user *buf,
break;
case 'x':
case 'X':
rule.smk_access |= MAY_EXEC;
rule->smk_access |= MAY_EXEC;
break;
default:
goto out;
goto out_free_rule;
}
switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) {
@ -334,17 +337,20 @@ static ssize_t smk_write_load(struct file *file, const char __user *buf,
break;
case 'a':
case 'A':
rule.smk_access |= MAY_APPEND;
rule->smk_access |= MAY_APPEND;
break;
default:
goto out;
goto out_free_rule;
}
rc = smk_set_access(&rule);
rc = smk_set_access(rule);
if (!rc)
rc = count;
goto out;
out_free_rule:
kfree(rule);
out:
kfree(data);
return rc;
@ -433,24 +439,26 @@ static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
{
if (*pos == SEQ_READ_FINISHED)
return NULL;
if (list_empty(&smack_known_list))
return NULL;
return smack_known;
return smack_known_list.next;
}
static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
struct smack_known *skp = ((struct smack_known *) v)->smk_next;
struct list_head *list = v;
/*
* Omit labels with no associated cipso value
* labels with no associated cipso value wont be printed
* in cipso_seq_show
*/
while (skp != NULL && !skp->smk_cipso)
skp = skp->smk_next;
if (skp == NULL)
if (list_is_last(list, &smack_known_list)) {
*pos = SEQ_READ_FINISHED;
return NULL;
}
return skp;
return list->next;
}
/*
@ -459,7 +467,9 @@ static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
*/
static int cipso_seq_show(struct seq_file *s, void *v)
{
struct smack_known *skp = (struct smack_known *) v;
struct list_head *list = v;
struct smack_known *skp =
list_entry(list, struct smack_known, list);
struct smack_cipso *scp = skp->smk_cipso;
char *cbp;
char sep = '/';
@ -558,6 +568,11 @@ static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
goto unlockedout;
}
/* labels cannot begin with a '-' */
if (data[0] == '-') {
rc = -EINVAL;
goto unlockedout;
}
data[count] = '\0';
rule = data;
/*
@ -638,18 +653,21 @@ static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos)
{
if (*pos == SEQ_READ_FINISHED)
return NULL;
return smack_netlbladdrs;
if (list_empty(&smk_netlbladdr_list))
return NULL;
return smk_netlbladdr_list.next;
}
static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
struct smk_netlbladdr *skp = ((struct smk_netlbladdr *) v)->smk_next;
struct list_head *list = v;
if (skp == NULL)
if (list_is_last(list, &smk_netlbladdr_list)) {
*pos = SEQ_READ_FINISHED;
return NULL;
}
return skp;
return list->next;
}
#define BEBITS (sizeof(__be32) * 8)
@ -658,7 +676,9 @@ static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos)
*/
static int netlbladdr_seq_show(struct seq_file *s, void *v)
{
struct smk_netlbladdr *skp = (struct smk_netlbladdr *) v;
struct list_head *list = v;
struct smk_netlbladdr *skp =
list_entry(list, struct smk_netlbladdr, list);
unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr;
int maskn;
u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr);
@ -702,30 +722,36 @@ static int smk_open_netlbladdr(struct inode *inode, struct file *file)
*
* This helper insert netlabel in the smack_netlbladdrs list
* sorted by netmask length (longest to smallest)
* locked by &smk_netlbladdr_lock in smk_write_netlbladdr
*
*/
static void smk_netlbladdr_insert(struct smk_netlbladdr *new)
{
struct smk_netlbladdr *m;
struct smk_netlbladdr *m, *m_next;
if (smack_netlbladdrs == NULL) {
smack_netlbladdrs = new;
if (list_empty(&smk_netlbladdr_list)) {
list_add_rcu(&new->list, &smk_netlbladdr_list);
return;
}
m = list_entry(rcu_dereference(smk_netlbladdr_list.next),
struct smk_netlbladdr, list);
/* the comparison '>' is a bit hacky, but works */
if (new->smk_mask.s_addr > smack_netlbladdrs->smk_mask.s_addr) {
new->smk_next = smack_netlbladdrs;
smack_netlbladdrs = new;
if (new->smk_mask.s_addr > m->smk_mask.s_addr) {
list_add_rcu(&new->list, &smk_netlbladdr_list);
return;
}
for (m = smack_netlbladdrs; m != NULL; m = m->smk_next) {
if (m->smk_next == NULL) {
m->smk_next = new;
list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) {
if (list_is_last(&m->list, &smk_netlbladdr_list)) {
list_add_rcu(&new->list, &m->list);
return;
}
if (new->smk_mask.s_addr > m->smk_next->smk_mask.s_addr) {
new->smk_next = m->smk_next;
m->smk_next = new;
m_next = list_entry(rcu_dereference(m->list.next),
struct smk_netlbladdr, list);
if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) {
list_add_rcu(&new->list, &m->list);
return;
}
}
@ -755,6 +781,7 @@ static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
struct netlbl_audit audit_info;
struct in_addr mask;
unsigned int m;
int found;
u32 mask_bits = (1<<31);
__be32 nsa;
u32 temp_mask;
@ -789,9 +816,18 @@ static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
if (m > BEBITS)
return -EINVAL;
sp = smk_import(smack, 0);
if (sp == NULL)
return -EINVAL;
/* if smack begins with '-', its an option, don't import it */
if (smack[0] != '-') {
sp = smk_import(smack, 0);
if (sp == NULL)
return -EINVAL;
} else {
/* check known options */
if (strcmp(smack, smack_cipso_option) == 0)
sp = (char *)smack_cipso_option;
else
return -EINVAL;
}
for (temp_mask = 0; m > 0; m--) {
temp_mask |= mask_bits;
@ -808,14 +844,17 @@ static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
nsa = newname.sin_addr.s_addr;
/* try to find if the prefix is already in the list */
for (skp = smack_netlbladdrs; skp != NULL; skp = skp->smk_next)
found = 0;
list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) {
if (skp->smk_host.sin_addr.s_addr == nsa &&
skp->smk_mask.s_addr == mask.s_addr)
skp->smk_mask.s_addr == mask.s_addr) {
found = 1;
break;
}
}
smk_netlabel_audit_set(&audit_info);
if (skp == NULL) {
if (found == 0) {
skp = kzalloc(sizeof(*skp), GFP_KERNEL);
if (skp == NULL)
rc = -ENOMEM;
@ -827,18 +866,23 @@ static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
smk_netlbladdr_insert(skp);
}
} else {
rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
&skp->smk_host.sin_addr, &skp->smk_mask,
PF_INET, &audit_info);
/* we delete the unlabeled entry, only if the previous label
* wasnt the special CIPSO option */
if (skp->smk_label != smack_cipso_option)
rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
&skp->smk_host.sin_addr, &skp->smk_mask,
PF_INET, &audit_info);
else
rc = 0;
skp->smk_label = sp;
}
/*
* Now tell netlabel about the single label nature of
* this host so that incoming packets get labeled.
* but only if we didn't get the special CIPSO option
*/
if (rc == 0)
if (rc == 0 && sp != smack_cipso_option)
rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
&skp->smk_host.sin_addr, &skp->smk_mask, PF_INET,
smack_to_secid(skp->smk_label), &audit_info);

2
security/tomoyo/common.h
Просмотреть файл

@ -55,7 +55,7 @@ struct tomoyo_path_info {
struct tomoyo_path_info_with_data {
/* Keep "head" first, for this pointer is passed to tomoyo_free(). */
struct tomoyo_path_info head;
char bariier1[16]; /* Safeguard for overrun. */
char barrier1[16]; /* Safeguard for overrun. */
char body[TOMOYO_MAX_PATHNAME_LEN];
char barrier2[16]; /* Safeguard for overrun. */
};