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Merge branch 'smack-for-3.20-rebased' of git://git.gitorious.org/smack-next/kernel into next

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This commit is contained in:
James Morris 2015-01-22 13:22:23 +11:00
commit 9d5a5f65fc
5 changed files with 267 additions and 52 deletions
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12
security/smack/Kconfig
View File

@ -28,3 +28,15 @@ config SECURITY_SMACK_BRINGUP
access rule set once the behavior is well understood.
This is a superior mechanism to the oft abused
"permissive" mode of other systems.
If you are unsure how to answer this question, answer N.
config SECURITY_SMACK_NETFILTER
bool "Packet marking using secmarks for netfilter"
depends on SECURITY_SMACK
depends on NETWORK_SECMARK
depends on NETFILTER
default n
help
This enables security marking of network packets using
Smack labels.
If you are unsure how to answer this question, answer N.

1
security/smack/Makefile
View File

@ -5,3 +5,4 @@
obj-$(CONFIG_SECURITY_SMACK) := smack.o
smack-y := smack_lsm.o smack_access.o smackfs.o
smack-$(CONFIG_NETFILTER) += smack_netfilter.o

11
security/smack/smack.h
View File

@ -248,6 +248,7 @@ struct smack_known *smk_find_entry(const char *);
/*
* Shared data.
*/
extern int smack_enabled;
extern int smack_cipso_direct;
extern int smack_cipso_mapped;
extern struct smack_known *smack_net_ambient;
@ -298,6 +299,16 @@ static inline struct smack_known *smk_of_task(const struct task_smack *tsp)
return tsp->smk_task;
}
static inline struct smack_known *smk_of_task_struct(const struct task_struct *t)
{
struct smack_known *skp;
rcu_read_lock();
skp = smk_of_task(__task_cred(t)->security);
rcu_read_unlock();
return skp;
}
/*
* Present a pointer to the forked smack label entry in an task blob.
*/

199
security/smack/smack_lsm.c
View File

@ -43,8 +43,6 @@
#include <linux/binfmts.h>
#include "smack.h"
#define task_security(task) (task_cred_xxx((task), security))
#define TRANS_TRUE "TRUE"
#define TRANS_TRUE_SIZE 4
@ -52,8 +50,11 @@
#define SMK_RECEIVING 1
#define SMK_SENDING 2
#if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
LIST_HEAD(smk_ipv6_port_list);
#endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */
static struct kmem_cache *smack_inode_cache;
int smack_enabled;
#ifdef CONFIG_SECURITY_SMACK_BRINGUP
static void smk_bu_mode(int mode, char *s)
@ -120,7 +121,7 @@ static int smk_bu_current(char *note, struct smack_known *oskp,
static int smk_bu_task(struct task_struct *otp, int mode, int rc)
{
struct task_smack *tsp = current_security();
struct task_smack *otsp = task_security(otp);
struct smack_known *smk_task = smk_of_task_struct(otp);
char acc[SMK_NUM_ACCESS_TYPE + 1];
if (rc <= 0)
@ -128,7 +129,7 @@ static int smk_bu_task(struct task_struct *otp, int mode, int rc)
smk_bu_mode(mode, acc);
pr_info("Smack Bringup: (%s %s %s) %s to %s\n",
tsp->smk_task->smk_known, otsp->smk_task->smk_known, acc,
tsp->smk_task->smk_known, smk_task->smk_known, acc,
current->comm, otp->comm);
return 0;
}
@ -160,7 +161,7 @@ static int smk_bu_file(struct file *file, int mode, int rc)
{
struct task_smack *tsp = current_security();
struct smack_known *sskp = tsp->smk_task;
struct inode *inode = file->f_inode;
struct inode *inode = file_inode(file);
char acc[SMK_NUM_ACCESS_TYPE + 1];
if (rc <= 0)
@ -168,7 +169,7 @@ static int smk_bu_file(struct file *file, int mode, int rc)
smk_bu_mode(mode, acc);
pr_info("Smack Bringup: (%s %s %s) file=(%s %ld %pD) %s\n",
sskp->smk_known, (char *)file->f_security, acc,
sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
inode->i_sb->s_id, inode->i_ino, file,
current->comm);
return 0;
@ -202,6 +203,7 @@ static int smk_bu_credfile(const struct cred *cred, struct file *file,
/**
* smk_fetch - Fetch the smack label from a file.
* @name: type of the label (attribute)
* @ip: a pointer to the inode
* @dp: a pointer to the dentry
*
@ -254,7 +256,9 @@ struct inode_smack *new_inode_smack(struct smack_known *skp)
/**
* new_task_smack - allocate a task security blob
* @smack: a pointer to the Smack label to use in the blob
* @task: a pointer to the Smack label for the running task
* @forked: a pointer to the Smack label for the forked task
* @gfp: type of the memory for the allocation
*
* Returns the new blob or NULL if there's no memory available
*/
@ -277,8 +281,9 @@ static struct task_smack *new_task_smack(struct smack_known *task,
/**
* smk_copy_rules - copy a rule set
* @nhead - new rules header pointer
* @ohead - old rules header pointer
* @nhead: new rules header pointer
* @ohead: old rules header pointer
* @gfp: type of the memory for the allocation
*
* Returns 0 on success, -ENOMEM on error
*/
@ -345,7 +350,8 @@ static int smk_ptrace_rule_check(struct task_struct *tracer,
saip = &ad;
}
tsp = task_security(tracer);
rcu_read_lock();
tsp = __task_cred(tracer)->security;
tracer_known = smk_of_task(tsp);
if ((mode & PTRACE_MODE_ATTACH) &&
@ -365,11 +371,14 @@ static int smk_ptrace_rule_check(struct task_struct *tracer,
tracee_known->smk_known,
0, rc, saip);
rcu_read_unlock();
return rc;
}
/* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip);
rcu_read_unlock();
return rc;
}
@ -396,7 +405,7 @@ static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
if (rc != 0)
return rc;
skp = smk_of_task(task_security(ctp));
skp = smk_of_task_struct(ctp);
rc = smk_ptrace_rule_check(current, skp, mode, __func__);
return rc;
@ -796,7 +805,7 @@ static int smack_inode_init_security(struct inode *inode, struct inode *dir,
if (name)
*name = XATTR_SMACK_SUFFIX;
if (value) {
if (value && len) {
rcu_read_lock();
may = smk_access_entry(skp->smk_known, dsp->smk_known,
&skp->smk_rules);
@ -817,10 +826,9 @@ static int smack_inode_init_security(struct inode *inode, struct inode *dir,
*value = kstrdup(isp->smk_known, GFP_NOFS);
if (*value == NULL)
return -ENOMEM;
}
if (len)
*len = strlen(isp->smk_known);
}
return 0;
}
@ -1344,6 +1352,9 @@ static int smack_file_permission(struct file *file, int mask)
* The security blob for a file is a pointer to the master
* label list, so no allocation is done.
*
* f_security is the owner security information. It
* isn't used on file access checks, it's for send_sigio.
*
* Returns 0
*/
static int smack_file_alloc_security(struct file *file)
@ -1381,17 +1392,18 @@ static int smack_file_ioctl(struct file *file, unsigned int cmd,
{
int rc = 0;
struct smk_audit_info ad;
struct inode *inode = file_inode(file);
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, file->f_path);
if (_IOC_DIR(cmd) & _IOC_WRITE) {
rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
rc = smk_bu_file(file, MAY_WRITE, rc);
}
if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) {
rc = smk_curacc(file->f_security, MAY_READ, &ad);
rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
rc = smk_bu_file(file, MAY_READ, rc);
}
@ -1409,10 +1421,11 @@ static int smack_file_lock(struct file *file, unsigned int cmd)
{
struct smk_audit_info ad;
int rc;
struct inode *inode = file_inode(file);
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, file->f_path);
rc = smk_curacc(file->f_security, MAY_LOCK, &ad);
rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
rc = smk_bu_file(file, MAY_LOCK, rc);
return rc;
}
@ -1434,7 +1447,7 @@ static int smack_file_fcntl(struct file *file, unsigned int cmd,
{
struct smk_audit_info ad;
int rc = 0;
struct inode *inode = file_inode(file);
switch (cmd) {
case F_GETLK:
@ -1443,14 +1456,14 @@ static int smack_file_fcntl(struct file *file, unsigned int cmd,
case F_SETLKW:
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, file->f_path);
rc = smk_curacc(file->f_security, MAY_LOCK, &ad);
rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
rc = smk_bu_file(file, MAY_LOCK, rc);
break;
case F_SETOWN:
case F_SETSIG:
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, file->f_path);
rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
rc = smk_bu_file(file, MAY_WRITE, rc);
break;
default:
@ -1568,14 +1581,10 @@ static int smack_mmap_file(struct file *file,
* smack_file_set_fowner - set the file security blob value
* @file: object in question
*
* Returns 0
* Further research may be required on this one.
*/
static void smack_file_set_fowner(struct file *file)
{
struct smack_known *skp = smk_of_current();
file->f_security = skp;
file->f_security = smk_of_current();
}
/**
@ -1627,6 +1636,7 @@ static int smack_file_receive(struct file *file)
int rc;
int may = 0;
struct smk_audit_info ad;
struct inode *inode = file_inode(file);
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, file->f_path);
@ -1638,7 +1648,7 @@ static int smack_file_receive(struct file *file)
if (file->f_mode & FMODE_WRITE)
may |= MAY_WRITE;
rc = smk_curacc(file->f_security, may, &ad);
rc = smk_curacc(smk_of_inode(inode), may, &ad);
rc = smk_bu_file(file, may, rc);
return rc;
}
@ -1658,21 +1668,17 @@ static int smack_file_receive(struct file *file)
static int smack_file_open(struct file *file, const struct cred *cred)
{
struct task_smack *tsp = cred->security;
struct inode_smack *isp = file_inode(file)->i_security;
struct inode *inode = file_inode(file);
struct smk_audit_info ad;
int rc;
if (smack_privileged(CAP_MAC_OVERRIDE)) {
file->f_security = isp->smk_inode;
if (smack_privileged(CAP_MAC_OVERRIDE))
return 0;
}
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, file->f_path);
rc = smk_access(tsp->smk_task, isp->smk_inode, MAY_READ, &ad);
rc = smk_access(tsp->smk_task, smk_of_inode(inode), MAY_READ, &ad);
rc = smk_bu_credfile(cred, file, MAY_READ, rc);
if (rc == 0)
file->f_security = isp->smk_inode;
return rc;
}
@ -1826,7 +1832,7 @@ static int smk_curacc_on_task(struct task_struct *p, int access,
const char *caller)
{
struct smk_audit_info ad;
struct smack_known *skp = smk_of_task(task_security(p));
struct smack_known *skp = smk_of_task_struct(p);
int rc;
smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
@ -1879,7 +1885,7 @@ static int smack_task_getsid(struct task_struct *p)
*/
static void smack_task_getsecid(struct task_struct *p, u32 *secid)
{
struct smack_known *skp = smk_of_task(task_security(p));
struct smack_known *skp = smk_of_task_struct(p);
*secid = skp->smk_secid;
}
@ -1986,7 +1992,7 @@ static int smack_task_kill(struct task_struct *p, struct siginfo *info,
{
struct smk_audit_info ad;
struct smack_known *skp;
struct smack_known *tkp = smk_of_task(task_security(p));
struct smack_known *tkp = smk_of_task_struct(p);
int rc;
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
@ -2040,7 +2046,7 @@ static int smack_task_wait(struct task_struct *p)
static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
{
struct inode_smack *isp = inode->i_security;
struct smack_known *skp = smk_of_task(task_security(p));
struct smack_known *skp = smk_of_task_struct(p);
isp->smk_inode = skp;
}
@ -2212,6 +2218,7 @@ static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
return smack_netlabel(sk, sk_lbl);
}
#if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
/**
* smk_ipv6_port_label - Smack port access table management
* @sock: socket
@ -2361,6 +2368,7 @@ auditout:
rc = smk_bu_note("IPv6 port check", skp, object, MAY_WRITE, rc);
return rc;
}
#endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */
/**
* smack_inode_setsecurity - set smack xattrs
@ -2421,8 +2429,10 @@ static int smack_inode_setsecurity(struct inode *inode, const char *name,
} else
return -EOPNOTSUPP;
#if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
if (sock->sk->sk_family == PF_INET6)
smk_ipv6_port_label(sock, NULL);
#endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */
return 0;
}
@ -2450,6 +2460,7 @@ static int smack_socket_post_create(struct socket *sock, int family,
return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
}
#ifndef CONFIG_SECURITY_SMACK_NETFILTER
/**
* smack_socket_bind - record port binding information.
* @sock: the socket
@ -2463,11 +2474,14 @@ static int smack_socket_post_create(struct socket *sock, int family,
static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
int addrlen)
{
#if IS_ENABLED(CONFIG_IPV6)
if (sock->sk != NULL && sock->sk->sk_family == PF_INET6)
smk_ipv6_port_label(sock, address);
#endif
return 0;
}
#endif /* !CONFIG_SECURITY_SMACK_NETFILTER */
/**
* smack_socket_connect - connect access check
@ -2496,8 +2510,10 @@ static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
case PF_INET6:
if (addrlen < sizeof(struct sockaddr_in6))
return -EINVAL;
#if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
rc = smk_ipv6_port_check(sock->sk, (struct sockaddr_in6 *)sap,
SMK_CONNECTING);
#endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */
break;
}
return rc;
@ -3033,7 +3049,8 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
* of the superblock.
*/
if (opt_dentry->d_parent == opt_dentry) {
if (sbp->s_magic == CGROUP_SUPER_MAGIC) {
switch (sbp->s_magic) {
case CGROUP_SUPER_MAGIC:
/*
* The cgroup filesystem is never mounted,
* so there's no opportunity to set the mount
@ -3041,8 +3058,19 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
*/
sbsp->smk_root = &smack_known_star;
sbsp->smk_default = &smack_known_star;
isp->smk_inode = sbsp->smk_root;
break;
case TMPFS_MAGIC:
/*
* What about shmem/tmpfs anonymous files with dentry
* obtained from d_alloc_pseudo()?
*/
isp->smk_inode = smk_of_current();
break;
default:
isp->smk_inode = sbsp->smk_root;
break;
}
isp->smk_inode = sbsp->smk_root;
isp->smk_flags |= SMK_INODE_INSTANT;
goto unlockandout;
}
@ -3200,7 +3228,7 @@ unlockandout:
*/
static int smack_getprocattr(struct task_struct *p, char *name, char **value)
{
struct smack_known *skp = smk_of_task(task_security(p));
struct smack_known *skp = smk_of_task_struct(p);
char *cp;
int slen;
@ -3297,7 +3325,7 @@ static int smack_unix_stream_connect(struct sock *sock,
if (!smack_privileged(CAP_MAC_OVERRIDE)) {
skp = ssp->smk_out;
okp = osp->smk_out;
okp = osp->smk_in;
#ifdef CONFIG_AUDIT
smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
smk_ad_setfield_u_net_sk(&ad, other);
@ -3305,7 +3333,9 @@ static int smack_unix_stream_connect(struct sock *sock,
rc = smk_access(skp, okp, MAY_WRITE, &ad);
rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc);
if (rc == 0) {
rc = smk_access(okp, skp, MAY_WRITE, NULL);
okp = osp->smk_out;
skp = ssp->smk_in;
rc = smk_access(okp, skp, MAY_WRITE, &ad);
rc = smk_bu_note("UDS connect", okp, skp,
MAY_WRITE, rc);
}
@ -3366,7 +3396,9 @@ static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
int size)
{
struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
#if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name;
#endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */
int rc = 0;
/*
@ -3380,7 +3412,9 @@ static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
rc = smack_netlabel_send(sock->sk, sip);
break;
case AF_INET6:
#if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
#endif /* CONFIG_IPV6 && !CONFIG_SECURITY_SMACK_NETFILTER */
break;
}
return rc;
@ -3471,6 +3505,7 @@ static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
return smack_net_ambient;
}
#if IS_ENABLED(CONFIG_IPV6)
static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
{
u8 nexthdr;
@ -3517,6 +3552,7 @@ static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
}
return proto;
}
#endif /* CONFIG_IPV6 */
/**
* smack_socket_sock_rcv_skb - Smack packet delivery access check
@ -3529,15 +3565,30 @@ static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
struct netlbl_lsm_secattr secattr;
struct socket_smack *ssp = sk->sk_security;
struct smack_known *skp;
struct sockaddr_in6 sadd;
struct smack_known *skp = NULL;
int rc = 0;
struct smk_audit_info ad;
#ifdef CONFIG_AUDIT
struct lsm_network_audit net;
#endif
#if IS_ENABLED(CONFIG_IPV6)
struct sockaddr_in6 sadd;
int proto;
#endif /* CONFIG_IPV6 */
switch (sk->sk_family) {
case PF_INET:
#ifdef CONFIG_SECURITY_SMACK_NETFILTER
/*
* If there is a secmark use it rather than the CIPSO label.
* If there is no secmark fall back to CIPSO.
* The secmark is assumed to reflect policy better.
*/
if (skb && skb->secmark != 0) {
skp = smack_from_secid(skb->secmark);
goto access_check;
}
#endif /* CONFIG_SECURITY_SMACK_NETFILTER */
/*
* Translate what netlabel gave us.
*/
@ -3551,6 +3602,9 @@ static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
netlbl_secattr_destroy(&secattr);
#ifdef CONFIG_SECURITY_SMACK_NETFILTER
access_check:
#endif
#ifdef CONFIG_AUDIT
smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
ad.a.u.net->family = sk->sk_family;
@ -3569,14 +3623,32 @@ static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
if (rc != 0)
netlbl_skbuff_err(skb, rc, 0);
break;
#if IS_ENABLED(CONFIG_IPV6)
case PF_INET6:
rc = smk_skb_to_addr_ipv6(skb, &sadd);
if (rc == IPPROTO_UDP || rc == IPPROTO_TCP)
rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
proto = smk_skb_to_addr_ipv6(skb, &sadd);
if (proto != IPPROTO_UDP && proto != IPPROTO_TCP)
break;
#ifdef CONFIG_SECURITY_SMACK_NETFILTER
if (skb && skb->secmark != 0)
skp = smack_from_secid(skb->secmark);
else
rc = 0;
skp = smack_net_ambient;
#ifdef CONFIG_AUDIT
smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
ad.a.u.net->family = sk->sk_family;
ad.a.u.net->netif = skb->skb_iif;
ipv6_skb_to_auditdata(skb, &ad.a, NULL);
#endif /* CONFIG_AUDIT */
rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in,
MAY_WRITE, rc);
#else /* CONFIG_SECURITY_SMACK_NETFILTER */
rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
#endif /* CONFIG_SECURITY_SMACK_NETFILTER */
break;
#endif /* CONFIG_IPV6 */
}
return rc;
}
@ -3638,16 +3710,25 @@ static int smack_socket_getpeersec_dgram(struct socket *sock,
if (skb != NULL) {
if (skb->protocol == htons(ETH_P_IP))
family = PF_INET;
#if IS_ENABLED(CONFIG_IPV6)
else if (skb->protocol == htons(ETH_P_IPV6))
family = PF_INET6;
#endif /* CONFIG_IPV6 */
}
if (family == PF_UNSPEC && sock != NULL)
family = sock->sk->sk_family;
if (family == PF_UNIX) {
switch (family) {
case PF_UNIX:
ssp = sock->sk->sk_security;
s = ssp->smk_out->smk_secid;
} else if (family == PF_INET || family == PF_INET6) {
break;
case PF_INET:
#ifdef CONFIG_SECURITY_SMACK_NETFILTER
s = skb->secmark;
if (s != 0)
break;
#endif
/*
* Translate what netlabel gave us.
*/
@ -3660,6 +3741,14 @@ static int smack_socket_getpeersec_dgram(struct socket *sock,
s = skp->smk_secid;
}
netlbl_secattr_destroy(&secattr);
break;
#if IS_ENABLED(CONFIG_IPV6)
case PF_INET6:
#ifdef CONFIG_SECURITY_SMACK_NETFILTER
s = skb->secmark;
#endif /* CONFIG_SECURITY_SMACK_NETFILTER */
break;
#endif /* CONFIG_IPV6 */
}
*secid = s;
if (s == 0)
@ -3715,6 +3804,7 @@ static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
struct lsm_network_audit net;
#endif
#if IS_ENABLED(CONFIG_IPV6)
if (family == PF_INET6) {
/*
* Handle mapped IPv4 packets arriving
@ -3726,6 +3816,7 @@ static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
else
return 0;
}
#endif /* CONFIG_IPV6 */
netlbl_secattr_init(&secattr);
rc = netlbl_skbuff_getattr(skb, family, &secattr);
@ -3834,11 +3925,11 @@ static void smack_key_free(struct key *key)
key->security = NULL;
}
/*
/**
* smack_key_permission - Smack access on a key
* @key_ref: gets to the object
* @cred: the credentials to use
* @perm: unused
* @perm: requested key permissions
*
* Return 0 if the task has read and write to the object,
* an error code otherwise
@ -4184,7 +4275,9 @@ struct security_operations smack_ops = {
.unix_may_send = smack_unix_may_send,
.socket_post_create = smack_socket_post_create,
#ifndef CONFIG_SECURITY_SMACK_NETFILTER
.socket_bind = smack_socket_bind,
#endif /* CONFIG_SECURITY_SMACK_NETFILTER */
.socket_connect = smack_socket_connect,
.socket_sendmsg = smack_socket_sendmsg,
.socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
@ -4265,6 +4358,8 @@ static __init int smack_init(void)
if (!security_module_enable(&smack_ops))
return 0;
smack_enabled = 1;
smack_inode_cache = KMEM_CACHE(inode_smack, 0);
if (!smack_inode_cache)
return -ENOMEM;

96
security/smack/smack_netfilter.c Normal file
View File

@ -0,0 +1,96 @@
/*
* Simplified MAC Kernel (smack) security module
*
* This file contains the Smack netfilter implementation
*
* Author:
* Casey Schaufler <casey@schaufler-ca.com>
*
* Copyright (C) 2014 Casey Schaufler <casey@schaufler-ca.com>
* Copyright (C) 2014 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2,
* as published by the Free Software Foundation.
*/
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6.h>
#include <linux/netdevice.h>
#include "smack.h"
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
static unsigned int smack_ipv6_output(const struct nf_hook_ops *ops,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
struct socket_smack *ssp;
struct smack_known *skp;
if (skb && skb->sk && skb->sk->sk_security) {
ssp = skb->sk->sk_security;
skp = ssp->smk_out;
skb->secmark = skp->smk_secid;
}
return NF_ACCEPT;
}
#endif /* IPV6 */
static unsigned int smack_ipv4_output(const struct nf_hook_ops *ops,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
struct socket_smack *ssp;
struct smack_known *skp;
if (skb && skb->sk && skb->sk->sk_security) {
ssp = skb->sk->sk_security;
skp = ssp->smk_out;
skb->secmark = skp->smk_secid;
}
return NF_ACCEPT;
}
static struct nf_hook_ops smack_nf_ops[] = {
{
.hook = smack_ipv4_output,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP_PRI_SELINUX_FIRST,
},
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
{
.hook = smack_ipv6_output,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP6_PRI_SELINUX_FIRST,
},
#endif /* IPV6 */
};
static int __init smack_nf_ip_init(void)
{
int err;
if (smack_enabled == 0)
return 0;
printk(KERN_DEBUG "Smack: Registering netfilter hooks\n");
err = nf_register_hooks(smack_nf_ops, ARRAY_SIZE(smack_nf_ops));
if (err)
pr_info("Smack: nf_register_hooks: error %d\n", err);
return 0;
}
__initcall(smack_nf_ip_init);