summaryrefslogtreecommitdiffstats
path: root/security/smack
diff options
context:
space:
mode:
Diffstat (limited to 'security/smack')
-rw-r--r--security/smack/smack.h110
-rw-r--r--security/smack/smack_access.c43
-rw-r--r--security/smack/smack_lsm.c684
-rw-r--r--security/smack/smackfs.c53
4 files changed, 610 insertions, 280 deletions
diff --git a/security/smack/smack.h b/security/smack/smack.h
index 8ad30955e15..339614c76e6 100644
--- a/security/smack/smack.h
+++ b/security/smack/smack.h
@@ -29,6 +29,38 @@
#define SMK_LONGLABEL 256
/*
+ * This is the repository for labels seen so that it is
+ * not necessary to keep allocating tiny chuncks of memory
+ * and so that they can be shared.
+ *
+ * Labels are never modified in place. Anytime a label
+ * is imported (e.g. xattrset on a file) the list is checked
+ * for it and it is added if it doesn't exist. The address
+ * is passed out in either case. Entries are added, but
+ * never deleted.
+ *
+ * Since labels are hanging around anyway it doesn't
+ * hurt to maintain a secid for those awkward situations
+ * where kernel components that ought to use LSM independent
+ * interfaces don't. The secid should go away when all of
+ * these components have been repaired.
+ *
+ * The cipso value associated with the label gets stored here, too.
+ *
+ * Keep the access rules for this subject label here so that
+ * the entire set of rules does not need to be examined every
+ * time.
+ */
+struct smack_known {
+ struct list_head list;
+ char *smk_known;
+ u32 smk_secid;
+ struct netlbl_lsm_secattr smk_netlabel; /* on wire labels */
+ struct list_head smk_rules; /* access rules */
+ struct mutex smk_rules_lock; /* lock for rules */
+};
+
+/*
* Maximum number of bytes for the levels in a CIPSO IP option.
* Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
* bigger than can be used, and 24 is the next lower multiple
@@ -46,25 +78,25 @@ struct superblock_smack {
};
struct socket_smack {
- char *smk_out; /* outbound label */
- char *smk_in; /* inbound label */
- char *smk_packet; /* TCP peer label */
+ struct smack_known *smk_out; /* outbound label */
+ char *smk_in; /* inbound label */
+ char *smk_packet; /* TCP peer label */
};
/*
* Inode smack data
*/
struct inode_smack {
- char *smk_inode; /* label of the fso */
- char *smk_task; /* label of the task */
- char *smk_mmap; /* label of the mmap domain */
- struct mutex smk_lock; /* initialization lock */
- int smk_flags; /* smack inode flags */
+ char *smk_inode; /* label of the fso */
+ struct smack_known *smk_task; /* label of the task */
+ struct smack_known *smk_mmap; /* label of the mmap domain */
+ struct mutex smk_lock; /* initialization lock */
+ int smk_flags; /* smack inode flags */
};
struct task_smack {
- char *smk_task; /* label for access control */
- char *smk_forked; /* label when forked */
+ struct smack_known *smk_task; /* label for access control */
+ struct smack_known *smk_forked; /* label when forked */
struct list_head smk_rules; /* per task access rules */
struct mutex smk_rules_lock; /* lock for the rules */
};
@@ -78,7 +110,7 @@ struct task_smack {
*/
struct smack_rule {
struct list_head list;
- char *smk_subject;
+ struct smack_known *smk_subject;
char *smk_object;
int smk_access;
};
@@ -94,35 +126,14 @@ struct smk_netlbladdr {
};
/*
- * This is the repository for labels seen so that it is
- * not necessary to keep allocating tiny chuncks of memory
- * and so that they can be shared.
- *
- * Labels are never modified in place. Anytime a label
- * is imported (e.g. xattrset on a file) the list is checked
- * for it and it is added if it doesn't exist. The address
- * is passed out in either case. Entries are added, but
- * never deleted.
- *
- * Since labels are hanging around anyway it doesn't
- * hurt to maintain a secid for those awkward situations
- * where kernel components that ought to use LSM independent
- * interfaces don't. The secid should go away when all of
- * these components have been repaired.
- *
- * The cipso value associated with the label gets stored here, too.
- *
- * Keep the access rules for this subject label here so that
- * the entire set of rules does not need to be examined every
- * time.
+ * An entry in the table identifying ports.
*/
-struct smack_known {
- struct list_head list;
- char *smk_known;
- u32 smk_secid;
- struct netlbl_lsm_secattr smk_netlabel; /* on wire labels */
- struct list_head smk_rules; /* access rules */
- struct mutex smk_rules_lock; /* lock for rules */
+struct smk_port_label {
+ struct list_head list;
+ struct sock *smk_sock; /* socket initialized on */
+ unsigned short smk_port; /* the port number */
+ char *smk_in; /* incoming label */
+ struct smack_known *smk_out; /* outgoing label */
};
/*
@@ -132,6 +143,7 @@ struct smack_known {
#define SMK_FSFLOOR "smackfsfloor="
#define SMK_FSHAT "smackfshat="
#define SMK_FSROOT "smackfsroot="
+#define SMK_FSTRANS "smackfstransmute="
#define SMACK_CIPSO_OPTION "-CIPSO"
@@ -203,9 +215,9 @@ struct inode_smack *new_inode_smack(char *);
* These functions are in smack_access.c
*/
int smk_access_entry(char *, char *, struct list_head *);
-int smk_access(char *, char *, int, struct smk_audit_info *);
+int smk_access(struct smack_known *, char *, int, struct smk_audit_info *);
int smk_curacc(char *, u32, struct smk_audit_info *);
-char *smack_from_secid(const u32);
+struct smack_known *smack_from_secid(const u32);
char *smk_parse_smack(const char *string, int len);
int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int);
char *smk_import(const char *, int);
@@ -218,7 +230,7 @@ u32 smack_to_secid(const char *);
*/
extern int smack_cipso_direct;
extern int smack_cipso_mapped;
-extern char *smack_net_ambient;
+extern struct smack_known *smack_net_ambient;
extern char *smack_onlycap;
extern const char *smack_cipso_option;
@@ -254,17 +266,17 @@ static inline char *smk_of_inode(const struct inode *isp)
}
/*
- * Present a pointer to the smack label in an task blob.
+ * Present a pointer to the smack label entry in an task blob.
*/
-static inline char *smk_of_task(const struct task_smack *tsp)
+static inline struct smack_known *smk_of_task(const struct task_smack *tsp)
{
return tsp->smk_task;
}
/*
- * Present a pointer to the forked smack label in an task blob.
+ * Present a pointer to the forked smack label entry in an task blob.
*/
-static inline char *smk_of_forked(const struct task_smack *tsp)
+static inline struct smack_known *smk_of_forked(const struct task_smack *tsp)
{
return tsp->smk_forked;
}
@@ -272,7 +284,7 @@ static inline char *smk_of_forked(const struct task_smack *tsp)
/*
* Present a pointer to the smack label in the current task blob.
*/
-static inline char *smk_of_current(void)
+static inline struct smack_known *smk_of_current(void)
{
return smk_of_task(current_security());
}
@@ -283,9 +295,11 @@ static inline char *smk_of_current(void)
*/
static inline int smack_privileged(int cap)
{
+ struct smack_known *skp = smk_of_current();
+
if (!capable(cap))
return 0;
- if (smack_onlycap == NULL || smack_onlycap == smk_of_current())
+ if (smack_onlycap == NULL || smack_onlycap == skp->smk_known)
return 1;
return 0;
}
diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c
index 2e397a88d41..6a0377f3862 100644
--- a/security/smack/smack_access.c
+++ b/security/smack/smack_access.c
@@ -93,7 +93,7 @@ int smk_access_entry(char *subject_label, char *object_label,
list_for_each_entry_rcu(srp, rule_list, list) {
if (srp->smk_object == object_label &&
- srp->smk_subject == subject_label) {
+ srp->smk_subject->smk_known == subject_label) {
may = srp->smk_access;
break;
}
@@ -104,7 +104,7 @@ int smk_access_entry(char *subject_label, char *object_label,
/**
* smk_access - determine if a subject has a specific access to an object
- * @subject_label: a pointer to the subject's Smack label
+ * @subject_known: a pointer to the subject's Smack label entry
* @object_label: a pointer to the object's Smack label
* @request: the access requested, in "MAY" format
* @a : a pointer to the audit data
@@ -115,10 +115,9 @@ int smk_access_entry(char *subject_label, char *object_label,
*
* Smack labels are shared on smack_list
*/
-int smk_access(char *subject_label, char *object_label, int request,
- struct smk_audit_info *a)
+int smk_access(struct smack_known *subject_known, char *object_label,
+ int request, struct smk_audit_info *a)
{
- struct smack_known *skp;
int may = MAY_NOT;
int rc = 0;
@@ -127,7 +126,7 @@ int smk_access(char *subject_label, char *object_label, int request,
*
* A star subject can't access any object.
*/
- if (subject_label == smack_known_star.smk_known) {
+ if (subject_known == &smack_known_star) {
rc = -EACCES;
goto out_audit;
}
@@ -137,7 +136,7 @@ int smk_access(char *subject_label, char *object_label, int request,
* An internet subject can access any object.
*/
if (object_label == smack_known_web.smk_known ||
- subject_label == smack_known_web.smk_known)
+ subject_known == &smack_known_web)
goto out_audit;
/*
* A star object can be accessed by any subject.
@@ -148,7 +147,7 @@ int smk_access(char *subject_label, char *object_label, int request,
* An object can be accessed in any way by a subject
* with the same label.
*/
- if (subject_label == object_label)
+ if (subject_known->smk_known == object_label)
goto out_audit;
/*
* A hat subject can read any object.
@@ -157,7 +156,7 @@ int smk_access(char *subject_label, char *object_label, int request,
if ((request & MAY_ANYREAD) == request) {
if (object_label == smack_known_floor.smk_known)
goto out_audit;
- if (subject_label == smack_known_hat.smk_known)
+ if (subject_known == &smack_known_hat)
goto out_audit;
}
/*
@@ -167,9 +166,9 @@ int smk_access(char *subject_label, char *object_label, int request,
* good. A negative response from smk_access_entry()
* indicates there is no entry for this pair.
*/
- skp = smk_find_entry(subject_label);
rcu_read_lock();
- may = smk_access_entry(subject_label, object_label, &skp->smk_rules);
+ may = smk_access_entry(subject_known->smk_known, object_label,
+ &subject_known->smk_rules);
rcu_read_unlock();
if (may > 0 && (request & may) == request)
@@ -179,7 +178,8 @@ int smk_access(char *subject_label, char *object_label, int request,
out_audit:
#ifdef CONFIG_AUDIT
if (a)
- smack_log(subject_label, object_label, request, rc, a);
+ smack_log(subject_known->smk_known, object_label, request,
+ rc, a);
#endif
return rc;
}
@@ -198,20 +198,21 @@ out_audit:
int smk_curacc(char *obj_label, u32 mode, struct smk_audit_info *a)
{
struct task_smack *tsp = current_security();
- char *sp = smk_of_task(tsp);
+ struct smack_known *skp = smk_of_task(tsp);
int may;
int rc;
/*
* Check the global rule list
*/
- rc = smk_access(sp, obj_label, mode, NULL);
+ rc = smk_access(skp, obj_label, mode, NULL);
if (rc == 0) {
/*
* If there is an entry in the task's rule list
* it can further restrict access.
*/
- may = smk_access_entry(sp, obj_label, &tsp->smk_rules);
+ may = smk_access_entry(skp->smk_known, obj_label,
+ &tsp->smk_rules);
if (may < 0)
goto out_audit;
if ((mode & may) == mode)
@@ -228,7 +229,7 @@ int smk_curacc(char *obj_label, u32 mode, struct smk_audit_info *a)
out_audit:
#ifdef CONFIG_AUDIT
if (a)
- smack_log(sp, obj_label, mode, rc, a);
+ smack_log(skp->smk_known, obj_label, mode, rc, a);
#endif
return rc;
}
@@ -402,6 +403,8 @@ int smk_netlbl_mls(int level, char *catset, struct netlbl_lsm_secattr *sap,
sap->flags |= NETLBL_SECATTR_MLS_CAT;
sap->attr.mls.lvl = level;
sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
+ if (!sap->attr.mls.cat)
+ return -ENOMEM;
sap->attr.mls.cat->startbit = 0;
for (cat = 1, cp = catset, byte = 0; byte < len; cp++, byte++)
@@ -513,10 +516,10 @@ char *smk_import(const char *string, int len)
* smack_from_secid - find the Smack label associated with a secid
* @secid: an integer that might be associated with a Smack label
*
- * Returns a pointer to the appropriate Smack label if there is one,
+ * Returns a pointer to the appropriate Smack label entry if there is one,
* otherwise a pointer to the invalid Smack label.
*/
-char *smack_from_secid(const u32 secid)
+struct smack_known *smack_from_secid(const u32 secid)
{
struct smack_known *skp;
@@ -524,7 +527,7 @@ char *smack_from_secid(const u32 secid)
list_for_each_entry_rcu(skp, &smack_known_list, list) {
if (skp->smk_secid == secid) {
rcu_read_unlock();
- return skp->smk_known;
+ return skp;
}
}
@@ -533,7 +536,7 @@ char *smack_from_secid(const u32 secid)
* of a secid that is not on the list.
*/
rcu_read_unlock();
- return smack_known_invalid.smk_known;
+ return &smack_known_invalid;
}
/**
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index d52c780bdb7..6a083303501 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -27,10 +27,13 @@
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/udp.h>
+#include <linux/dccp.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/pipe_fs_i.h>
#include <net/cipso_ipv4.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
#include <linux/audit.h>
#include <linux/magic.h>
#include <linux/dcache.h>
@@ -45,6 +48,12 @@
#define TRANS_TRUE "TRUE"
#define TRANS_TRUE_SIZE 4
+#define SMK_CONNECTING 0
+#define SMK_RECEIVING 1
+#define SMK_SENDING 2
+
+LIST_HEAD(smk_ipv6_port_list);
+
/**
* smk_fetch - Fetch the smack label from a file.
* @ip: a pointer to the inode
@@ -53,11 +62,12 @@
* Returns a pointer to the master list entry for the Smack label
* or NULL if there was no label to fetch.
*/
-static char *smk_fetch(const char *name, struct inode *ip, struct dentry *dp)
+static struct smack_known *smk_fetch(const char *name, struct inode *ip,
+ struct dentry *dp)
{
int rc;
char *buffer;
- char *result = NULL;
+ struct smack_known *skp = NULL;
if (ip->i_op->getxattr == NULL)
return NULL;
@@ -68,11 +78,11 @@ static char *smk_fetch(const char *name, struct inode *ip, struct dentry *dp)
rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL);
if (rc > 0)
- result = smk_import(buffer, rc);
+ skp = smk_import_entry(buffer, rc);
kfree(buffer);
- return result;
+ return skp;
}
/**
@@ -102,7 +112,8 @@ struct inode_smack *new_inode_smack(char *smack)
*
* Returns the new blob or NULL if there's no memory available
*/
-static struct task_smack *new_task_smack(char *task, char *forked, gfp_t gfp)
+static struct task_smack *new_task_smack(struct smack_known *task,
+ struct smack_known *forked, gfp_t gfp)
{
struct task_smack *tsp;
@@ -164,17 +175,17 @@ static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
{
int rc;
struct smk_audit_info ad;
- char *tsp;
+ struct smack_known *skp;
rc = cap_ptrace_access_check(ctp, mode);
if (rc != 0)
return rc;
- tsp = smk_of_task(task_security(ctp));
+ skp = smk_of_task(task_security(ctp));
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
smk_ad_setfield_u_tsk(&ad, ctp);
- rc = smk_curacc(tsp, MAY_READWRITE, &ad);
+ rc = smk_curacc(skp->smk_known, MAY_READWRITE, &ad);
return rc;
}
@@ -190,17 +201,17 @@ static int smack_ptrace_traceme(struct task_struct *ptp)
{
int rc;
struct smk_audit_info ad;
- char *tsp;
+ struct smack_known *skp;
rc = cap_ptrace_traceme(ptp);
if (rc != 0)
return rc;
- tsp = smk_of_task(task_security(ptp));
+ skp = smk_of_task(task_security(ptp));
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
smk_ad_setfield_u_tsk(&ad, ptp);
- rc = smk_curacc(tsp, MAY_READWRITE, &ad);
+ rc = smk_curacc(skp->smk_known, MAY_READWRITE, &ad);
return rc;
}
@@ -215,12 +226,12 @@ static int smack_ptrace_traceme(struct task_struct *ptp)
static int smack_syslog(int typefrom_file)
{
int rc = 0;
- char *sp = smk_of_current();
+ struct smack_known *skp = smk_of_current();
if (smack_privileged(CAP_MAC_OVERRIDE))
return 0;
- if (sp != smack_known_floor.smk_known)
+ if (skp != &smack_known_floor)
rc = -EACCES;
return rc;
@@ -250,8 +261,9 @@ static int smack_sb_alloc_security(struct super_block *sb)
sbsp->smk_default = smack_known_floor.smk_known;
sbsp->smk_floor = smack_known_floor.smk_known;
sbsp->smk_hat = smack_known_hat.smk_known;
- sbsp->smk_initialized = 0;
-
+ /*
+ * smk_initialized will be zero from kzalloc.
+ */
sb->s_security = sbsp;
return 0;
@@ -295,6 +307,8 @@ static int smack_sb_copy_data(char *orig, char *smackopts)
dp = smackopts;
else if (strstr(cp, SMK_FSROOT) == cp)
dp = smackopts;
+ else if (strstr(cp, SMK_FSTRANS) == cp)
+ dp = smackopts;
else
dp = otheropts;
@@ -330,8 +344,9 @@ static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
char *op;
char *commap;
char *nsp;
+ int transmute = 0;
- if (sp->smk_initialized != 0)
+ if (sp->smk_initialized)
return 0;
sp->smk_initialized = 1;
@@ -362,6 +377,13 @@ static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
nsp = smk_import(op, 0);
if (nsp != NULL)
sp->smk_root = nsp;
+ } else if (strncmp(op, SMK_FSTRANS, strlen(SMK_FSTRANS)) == 0) {
+ op += strlen(SMK_FSTRANS);
+ nsp = smk_import(op, 0);
+ if (nsp != NULL) {
+ sp->smk_root = nsp;
+ transmute = 1;
+ }
}
}
@@ -369,11 +391,15 @@ static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
* Initialize the root inode.
*/
isp = inode->i_security;
- if (isp == NULL)
+ if (inode->i_security == NULL) {
inode->i_security = new_inode_smack(sp->smk_root);
- else
+ isp = inode->i_security;
+ } else
isp->smk_inode = sp->smk_root;
+ if (transmute)
+ isp->smk_flags |= SMK_INODE_TRANSMUTE;
+
return 0;
}
@@ -524,7 +550,9 @@ static int smack_bprm_secureexec(struct linux_binprm *bprm)
*/
static int smack_inode_alloc_security(struct inode *inode)
{
- inode->i_security = new_inode_smack(smk_of_current());
+ struct smack_known *skp = smk_of_current();
+
+ inode->i_security = new_inode_smack(skp->smk_known);
if (inode->i_security == NULL)
return -ENOMEM;
return 0;
@@ -557,9 +585,8 @@ static int smack_inode_init_security(struct inode *inode, struct inode *dir,
const struct qstr *qstr, char **name,
void **value, size_t *len)
{
- struct smack_known *skp;
struct inode_smack *issp = inode->i_security;
- char *csp = smk_of_current();
+ struct smack_known *skp = smk_of_current();
char *isp = smk_of_inode(inode);
char *dsp = smk_of_inode(dir);
int may;
@@ -571,9 +598,8 @@ static int smack_inode_init_security(struct inode *inode, struct inode *dir,
}
if (value) {
- skp = smk_find_entry(csp);
rcu_read_lock();
- may = smk_access_entry(csp, dsp, &skp->smk_rules);
+ may = smk_access_entry(skp->smk_known, dsp, &skp->smk_rules);
rcu_read_unlock();
/*
@@ -862,29 +888,31 @@ static int smack_inode_setxattr(struct dentry *dentry, const char *name,
static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
- char *nsp;
+ struct smack_known *skp;
struct inode_smack *isp = dentry->d_inode->i_security;
+ if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
+ isp->smk_flags |= SMK_INODE_TRANSMUTE;
+ return;
+ }
+
+ skp = smk_import_entry(value, size);
if (strcmp(name, XATTR_NAME_SMACK) == 0) {
- nsp = smk_import(value, size);
- if (nsp != NULL)
- isp->smk_inode = nsp;
+ if (skp != NULL)
+ isp->smk_inode = skp->smk_known;
else
isp->smk_inode = smack_known_invalid.smk_known;
} else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
- nsp = smk_import(value, size);
- if (nsp != NULL)
- isp->smk_task = nsp;
+ if (skp != NULL)
+ isp->smk_task = skp;
else
- isp->smk_task = smack_known_invalid.smk_known;
+ isp->smk_task = &smack_known_invalid;
} else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
- nsp = smk_import(value, size);
- if (nsp != NULL)
- isp->smk_mmap = nsp;
+ if (skp != NULL)
+ isp->smk_mmap = skp;
else
- isp->smk_mmap = smack_known_invalid.smk_known;
- } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
- isp->smk_flags |= SMK_INODE_TRANSMUTE;
+ isp->smk_mmap = &smack_known_invalid;
+ }
return;
}
@@ -990,7 +1018,7 @@ static int smack_inode_getsecurity(const struct inode *inode,
if (strcmp(name, XATTR_SMACK_IPIN) == 0)
isp = ssp->smk_in;
else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
- isp = ssp->smk_out;
+ isp = ssp->smk_out->smk_known;
else
return -EOPNOTSUPP;
@@ -1070,7 +1098,9 @@ static int smack_file_permission(struct file *file, int mask)
*/
static int smack_file_alloc_security(struct file *file)
{
- file->f_security = smk_of_current();
+ struct smack_known *skp = smk_of_current();
+
+ file->f_security = skp->smk_known;
return 0;
}
@@ -1181,10 +1211,9 @@ static int smack_mmap_file(struct file *file,
unsigned long flags)
{
struct smack_known *skp;
+ struct smack_known *mkp;
struct smack_rule *srp;
struct task_smack *tsp;
- char *sp;
- char *msmack;
char *osmack;
struct inode_smack *isp;
int may;
@@ -1198,11 +1227,10 @@ static int smack_mmap_file(struct file *file,
isp = file_inode(file)->i_security;
if (isp->smk_mmap == NULL)
return 0;
- msmack = isp->smk_mmap;
+ mkp = isp->smk_mmap;
tsp = current_security();
- sp = smk_of_current();
- skp = smk_find_entry(sp);
+ skp = smk_of_current();
rc = 0;
rcu_read_lock();
@@ -1216,13 +1244,13 @@ static int smack_mmap_file(struct file *file,
/*
* Matching labels always allows access.
*/
- if (msmack == osmack)
+ if (mkp->smk_known == osmack)
continue;
/*
* If there is a matching local rule take
* that into account as well.
*/
- may = smk_access_entry(srp->smk_subject, osmack,
+ may = smk_access_entry(srp->smk_subject->smk_known, osmack,
&tsp->smk_rules);
if (may == -ENOENT)
may = srp->smk_access;
@@ -1240,8 +1268,8 @@ static int smack_mmap_file(struct file *file,
* If there isn't one a SMACK64MMAP subject
* can't have as much access as current.
*/
- skp = smk_find_entry(msmack);
- mmay = smk_access_entry(msmack, osmack, &skp->smk_rules);
+ mmay = smk_access_entry(mkp->smk_known, osmack,
+ &mkp->smk_rules);
if (mmay == -ENOENT) {
rc = -EACCES;
break;
@@ -1250,7 +1278,8 @@ static int smack_mmap_file(struct file *file,
* If there is a local entry it modifies the
* potential access, too.
*/
- tmay = smk_access_entry(msmack, osmack, &tsp->smk_rules);
+ tmay = smk_access_entry(mkp->smk_known, osmack,
+ &tsp->smk_rules);
if (tmay != -ENOENT)
mmay &= tmay;
@@ -1279,7 +1308,9 @@ static int smack_mmap_file(struct file *file,
*/
static int smack_file_set_fowner(struct file *file)
{
- file->f_security = smk_of_current();
+ struct smack_known *skp = smk_of_current();
+
+ file->f_security = skp->smk_known;
return 0;
}
@@ -1297,9 +1328,10 @@ static int smack_file_set_fowner(struct file *file)
static int smack_file_send_sigiotask(struct task_struct *tsk,
struct fown_struct *fown, int signum)
{
+ struct smack_known *skp;
+ struct smack_known *tkp = smk_of_task(tsk->cred->security);
struct file *file;
int rc;
- char *tsp = smk_of_task(tsk->cred->security);
struct smk_audit_info ad;
/*
@@ -1308,13 +1340,14 @@ static int smack_file_send_sigiotask(struct task_struct *tsk,
file = container_of(fown, struct file, f_owner);
/* we don't log here as rc can be overriden */
- rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL);
+ skp = smk_find_entry(file->f_security);
+ rc = smk_access(skp, tkp->smk_known, MAY_WRITE, NULL);
if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
rc = 0;
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
smk_ad_setfield_u_tsk(&ad, tsk);
- smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad);
+ smack_log(file->f_security, tkp->smk_known, MAY_WRITE, rc, &ad);
return rc;
}
@@ -1469,12 +1502,12 @@ static void smack_cred_transfer(struct cred *new, const struct cred *old)
static int smack_kernel_act_as(struct cred *new, u32 secid)
{
struct task_smack *new_tsp = new->security;
- char *smack = smack_from_secid(secid);
+ struct smack_known *skp = smack_from_secid(secid);
- if (smack == NULL)
+ if (skp == NULL)
return -EINVAL;
- new_tsp->smk_task = smack;
+ new_tsp->smk_task = skp;
return 0;
}
@@ -1492,8 +1525,8 @@ static int smack_kernel_create_files_as(struct cred *new,
struct inode_smack *isp = inode->i_security;
struct task_smack *tsp = new->security;
- tsp->smk_forked = isp->smk_inode;
- tsp->smk_task = isp->smk_inode;
+ tsp->smk_forked = smk_find_entry(isp->smk_inode);
+ tsp->smk_task = tsp->smk_forked;
return 0;
}
@@ -1509,10 +1542,11 @@ 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));
smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
smk_ad_setfield_u_tsk(&ad, p);
- return smk_curacc(smk_of_task(task_security(p)), access, &ad);
+ return smk_curacc(skp->smk_known, access, &ad);
}
/**
@@ -1558,7 +1592,9 @@ static int smack_task_getsid(struct task_struct *p)
*/
static void smack_task_getsecid(struct task_struct *p, u32 *secid)
{
- *secid = smack_to_secid(smk_of_task(task_security(p)));
+ struct smack_known *skp = smk_of_task(task_security(p));
+
+ *secid = skp->smk_secid;
}
/**
@@ -1662,6 +1698,8 @@ static int smack_task_kill(struct task_struct *p, struct siginfo *info,
int sig, u32 secid)
{
struct smk_audit_info ad;
+ struct smack_known *skp;
+ struct smack_known *tkp = smk_of_task(task_security(p));
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
smk_ad_setfield_u_tsk(&ad, p);
@@ -1670,15 +1708,14 @@ static int smack_task_kill(struct task_struct *p, struct siginfo *info,
* can write the receiver.
*/
if (secid == 0)
- return smk_curacc(smk_of_task(task_security(p)), MAY_WRITE,
- &ad);
+ return smk_curacc(tkp->smk_known, MAY_WRITE, &ad);
/*
* If the secid isn't 0 we're dealing with some USB IO
* specific behavior. This is not clean. For one thing
* we can't take privilege into account.
*/
- return smk_access(smack_from_secid(secid),
- smk_of_task(task_security(p)), MAY_WRITE, &ad);
+ skp = smack_from_secid(secid);
+ return smk_access(skp, tkp->smk_known, MAY_WRITE, &ad);
}
/**
@@ -1710,7 +1747,9 @@ 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;
- isp->smk_inode = smk_of_task(task_security(p));
+ struct smack_known *skp = smk_of_task(task_security(p));
+
+ isp->smk_inode = skp->smk_known;
}
/*
@@ -1729,15 +1768,15 @@ static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
*/
static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
{
- char *csp = smk_of_current();
+ struct smack_known *skp = smk_of_current();
struct socket_smack *ssp;
ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
if (ssp == NULL)
return -ENOMEM;
- ssp->smk_in = csp;
- ssp->smk_out = csp;
+ ssp->smk_in = skp->smk_known;
+ ssp->smk_out = skp;
ssp->smk_packet = NULL;
sk->sk_security = ssp;
@@ -1824,7 +1863,7 @@ static int smack_netlabel(struct sock *sk, int labeled)
labeled == SMACK_UNLABELED_SOCKET)
netlbl_sock_delattr(sk);
else {
- skp = smk_find_entry(ssp->smk_out);
+ skp = ssp->smk_out;
rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
}
@@ -1847,6 +1886,7 @@ static int smack_netlabel(struct sock *sk, int labeled)
*/
static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
{
+ struct smack_known *skp;
int rc;
int sk_lbl;
char *hostsp;
@@ -1865,7 +1905,8 @@ static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
#endif
sk_lbl = SMACK_UNLABELED_SOCKET;
- rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad);
+ skp = ssp->smk_out;
+ rc = smk_access(skp, hostsp, MAY_WRITE, &ad);
} else {
sk_lbl = SMACK_CIPSO_SOCKET;
rc = 0;
@@ -1878,6 +1919,155 @@ static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
}
/**
+ * smk_ipv6_port_label - Smack port access table management
+ * @sock: socket
+ * @address: address
+ *
+ * Create or update the port list entry
+ */
+static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
+{
+ struct sock *sk = sock->sk;
+ struct sockaddr_in6 *addr6;
+ struct socket_smack *ssp = sock->sk->sk_security;
+ struct smk_port_label *spp;
+ unsigned short port = 0;
+
+ if (address == NULL) {
+ /*
+ * This operation is changing the Smack information
+ * on the bound socket. Take the changes to the port
+ * as well.
+ */
+ list_for_each_entry(spp, &smk_ipv6_port_list, list) {
+ if (sk != spp->smk_sock)
+ continue;
+ spp->smk_in = ssp->smk_in;
+ spp->smk_out = ssp->smk_out;
+ return;
+ }
+ /*
+ * A NULL address is only used for updating existing
+ * bound entries. If there isn't one, it's OK.
+ */
+ return;
+ }
+
+ addr6 = (struct sockaddr_in6 *)address;
+ port = ntohs(addr6->sin6_port);
+ /*
+ * This is a special case that is safely ignored.
+ */
+ if (port == 0)
+ return;
+
+ /*
+ * Look for an existing port list entry.
+ * This is an indication that a port is getting reused.
+ */
+ list_for_each_entry(spp, &smk_ipv6_port_list, list) {
+ if (spp->smk_port != port)
+ continue;
+ spp->smk_port = port;
+ spp->smk_sock = sk;
+ spp->smk_in = ssp->smk_in;
+ spp->smk_out = ssp->smk_out;
+ return;
+ }
+
+ /*
+ * A new port entry is required.
+ */
+ spp = kzalloc(sizeof(*spp), GFP_KERNEL);
+ if (spp == NULL)
+ return;
+
+ spp->smk_port = port;
+ spp->smk_sock = sk;
+ spp->smk_in = ssp->smk_in;
+ spp->smk_out = ssp->smk_out;
+
+ list_add(&spp->list, &smk_ipv6_port_list);
+ return;
+}
+
+/**
+ * smk_ipv6_port_check - check Smack port access
+ * @sock: socket
+ * @address: address
+ *
+ * Create or update the port list entry
+ */
+static int smk_ipv6_port_check(struct sock *sk, struct sockaddr *address,
+ int act)
+{
+ __be16 *bep;
+ __be32 *be32p;
+ struct sockaddr_in6 *addr6;
+ struct smk_port_label *spp;
+ struct socket_smack *ssp = sk->sk_security;
+ struct smack_known *skp;
+ unsigned short port = 0;
+ char *object;
+ struct smk_audit_info ad;
+#ifdef CONFIG_AUDIT
+ struct lsm_network_audit net;
+#endif
+
+ if (act == SMK_RECEIVING) {
+ skp = smack_net_ambient;
+ object = ssp->smk_in;
+ } else {
+ skp = ssp->smk_out;
+ object = smack_net_ambient->smk_known;
+ }
+
+ /*
+ * Get the IP address and port from the address.
+ */
+ addr6 = (struct sockaddr_in6 *)address;
+ port = ntohs(addr6->sin6_port);
+ bep = (__be16 *)(&addr6->sin6_addr);
+ be32p = (__be32 *)(&addr6->sin6_addr);
+
+ /*
+ * It's remote, so port lookup does no good.
+ */
+ if (be32p[0] || be32p[1] || be32p[2] || bep[6] || ntohs(bep[7]) != 1)
+ goto auditout;
+
+ /*
+ * It's local so the send check has to have passed.
+ */
+ if (act == SMK_RECEIVING) {
+ skp = &smack_known_web;
+ goto auditout;
+ }
+
+ list_for_each_entry(spp, &smk_ipv6_port_list, list) {
+ if (spp->smk_port != port)
+ continue;
+ object = spp->smk_in;
+ if (act == SMK_CONNECTING)
+ ssp->smk_packet = spp->smk_out->smk_known;
+ break;
+ }
+
+auditout:
+
+#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->dport = port;
+ if (act == SMK_RECEIVING)
+ ad.a.u.net->v6info.saddr = addr6->sin6_addr;
+ else
+ ad.a.u.net->v6info.daddr = addr6->sin6_addr;
+#endif
+ return smk_access(skp, object, MAY_WRITE, &ad);
+}
+
+/**
* smack_inode_setsecurity - set smack xattrs
* @inode: the object
* @name: attribute name
@@ -1892,7 +2082,7 @@ static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
static int smack_inode_setsecurity(struct inode *inode, const char *name,
const void *value, size_t size, int flags)
{
- char *sp;
+ struct smack_known *skp;
struct inode_smack *nsp = inode->i_security;
struct socket_smack *ssp;
struct socket *sock;
@@ -1901,12 +2091,12 @@ static int smack_inode_setsecurity(struct inode *inode, const char *name,
if (value == NULL || size > SMK_LONGLABEL || size == 0)
return -EACCES;
- sp = smk_import(value, size);
- if (sp == NULL)
+ skp = smk_import_entry(value, size);
+ if (skp == NULL)
return -EINVAL;
if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
- nsp->smk_inode = sp;
+ nsp->smk_inode = skp->smk_known;
nsp->smk_flags |= SMK_INODE_INSTANT;
return 0;
}
@@ -1923,10 +2113,10 @@ static int smack_inode_setsecurity(struct inode *inode, const char *name,
ssp = sock->sk->sk_security;
if (strcmp(name, XATTR_SMACK_IPIN) == 0)
- ssp->smk_in = sp;
+ ssp->smk_in = skp->smk_known;
else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
- ssp->smk_out = sp;
- if (sock->sk->sk_family != PF_UNIX) {
+ ssp->smk_out = skp;
+ if (sock->sk->sk_family == PF_INET) {
rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
if (rc != 0)
printk(KERN_WARNING
@@ -1936,6 +2126,9 @@ static int smack_inode_setsecurity(struct inode *inode, const char *name,
} else
return -EOPNOTSUPP;
+ if (sock->sk->sk_family == PF_INET6)
+ smk_ipv6_port_label(sock, NULL);
+
return 0;
}
@@ -1963,6 +2156,25 @@ static int smack_socket_post_create(struct socket *sock, int family,
}
/**
+ * smack_socket_bind - record port binding information.
+ * @sock: the socket
+ * @address: the port address
+ * @addrlen: size of the address
+ *
+ * Records the label bound to a port.
+ *
+ * Returns 0
+ */
+static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
+ int addrlen)
+{
+ if (sock->sk != NULL && sock->sk->sk_family == PF_INET6)
+ smk_ipv6_port_label(sock, address);
+
+ return 0;
+}
+
+/**
* smack_socket_connect - connect access check
* @sock: the socket
* @sap: the other end
@@ -1975,12 +2187,24 @@ static int smack_socket_post_create(struct socket *sock, int family,
static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
int addrlen)
{
- if (sock->sk == NULL || sock->sk->sk_family != PF_INET)
+ int rc = 0;
+
+ if (sock->sk == NULL)
return 0;
- if (addrlen < sizeof(struct sockaddr_in))
- return -EINVAL;
- return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
+ switch (sock->sk->sk_family) {
+ case PF_INET:
+ if (addrlen < sizeof(struct sockaddr_in))
+ return -EINVAL;
+ rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
+ break;
+ case PF_INET6:
+ if (addrlen < sizeof(struct sockaddr_in6))
+ return -EINVAL;
+ rc = smk_ipv6_port_check(sock->sk, sap, SMK_CONNECTING);
+ break;
+ }
+ return rc;
}
/**
@@ -2011,7 +2235,9 @@ static int smack_flags_to_may(int flags)
*/
static int smack_msg_msg_alloc_security(struct msg_msg *msg)
{
- msg->security = smk_of_current();
+ struct smack_known *skp = smk_of_current();
+
+ msg->security = skp->smk_known;
return 0;
}
@@ -2046,8 +2272,9 @@ static char *smack_of_shm(struct shmid_kernel *shp)
static int smack_shm_alloc_security(struct shmid_kernel *shp)
{
struct kern_ipc_perm *isp = &shp->shm_perm;
+ struct smack_known *skp = smk_of_current();
- isp->security = smk_of_current();
+ isp->security = skp->smk_known;
return 0;
}
@@ -2169,8 +2396,9 @@ static char *smack_of_sem(struct sem_array *sma)
static int smack_sem_alloc_security(struct sem_array *sma)
{
struct kern_ipc_perm *isp = &sma->sem_perm;
+ struct smack_known *skp = smk_of_current();
- isp->security = smk_of_current();
+ isp->security = skp->smk_known;
return 0;
}
@@ -2287,8 +2515,9 @@ static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
static int smack_msg_queue_alloc_security(struct msg_queue *msq)
{
struct kern_ipc_perm *kisp = &msq->q_perm;
+ struct smack_known *skp = smk_of_current();
- kisp->security = smk_of_current();
+ kisp->security = skp->smk_known;
return 0;
}
@@ -2460,8 +2689,8 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
struct super_block *sbp;
struct superblock_smack *sbsp;
struct inode_smack *isp;
- char *csp = smk_of_current();
- char *fetched;
+ struct smack_known *skp;
+ struct smack_known *ckp = smk_of_current();
char *final;
char trattr[TRANS_TRUE_SIZE];
int transflag = 0;
@@ -2528,7 +2757,7 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
* Programs that change smack have to treat the
* pty with respect.
*/
- final = csp;
+ final = ckp->smk_known;
break;
case SOCKFS_MAGIC:
/*
@@ -2583,9 +2812,9 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
* Get the dentry for xattr.
*/
dp = dget(opt_dentry);
- fetched = smk_fetch(XATTR_NAME_SMACK, inode, dp);
- if (fetched != NULL)
- final = fetched;
+ skp = smk_fetch(XATTR_NAME_SMACK, inode, dp);
+ if (skp != NULL)
+ final = skp->smk_known;
/*
* Transmuting directory
@@ -2625,7 +2854,7 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
}
if (final == NULL)
- isp->smk_inode = csp;
+ isp->smk_inode = ckp->smk_known;
else
isp->smk_inode = final;
@@ -2648,13 +2877,14 @@ unlockandout:
*/
static int smack_getprocattr(struct task_struct *p, char *name, char **value)
{
+ struct smack_known *skp = smk_of_task(task_security(p));
char *cp;
int slen;
if (strcmp(name, "current") != 0)
return -EINVAL;
- cp = kstrdup(smk_of_task(task_security(p)), GFP_KERNEL);
+ cp = kstrdup(skp->smk_known, GFP_KERNEL);
if (cp == NULL)
return -ENOMEM;
@@ -2680,7 +2910,7 @@ static int smack_setprocattr(struct task_struct *p, char *name,
{
struct task_smack *tsp;
struct cred *new;
- char *newsmack;
+ struct smack_known *skp;
/*
* Changing another process' Smack value is too dangerous
@@ -2698,14 +2928,14 @@ static int smack_setprocattr(struct task_struct *p, char *name,
if (strcmp(name, "current") != 0)
return -EINVAL;
- newsmack = smk_import(value, size);
- if (newsmack == NULL)
+ skp = smk_import_entry(value, size);
+ if (skp == NULL)
return -EINVAL;
/*
* No process is ever allowed the web ("@") label.
*/
- if (newsmack == smack_known_web.smk_known)
+ if (skp == &smack_known_web)
return -EPERM;
new = prepare_creds();
@@ -2713,7 +2943,7 @@ static int smack_setprocattr(struct task_struct *p, char *name,
return -ENOMEM;
tsp = new->security;
- tsp->smk_task = newsmack;
+ tsp->smk_task = skp;
commit_creds(new);
return size;
@@ -2731,6 +2961,7 @@ static int smack_setprocattr(struct task_struct *p, char *name,
static int smack_unix_stream_connect(struct sock *sock,
struct sock *other, struct sock *newsk)
{
+ struct smack_known *skp;
struct socket_smack *ssp = sock->sk_security;
struct socket_smack *osp = other->sk_security;
struct socket_smack *nsp = newsk->sk_security;
@@ -2744,15 +2975,17 @@ static int smack_unix_stream_connect(struct sock *sock,
smk_ad_setfield_u_net_sk(&ad, other);
#endif
- if (!smack_privileged(CAP_MAC_OVERRIDE))
- rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
+ if (!smack_privileged(CAP_MAC_OVERRIDE)) {
+ skp = ssp->smk_out;
+ rc = smk_access(skp, osp->smk_in, MAY_WRITE, &ad);
+ }
/*
* Cross reference the peer labels for SO_PEERSEC.
*/
if (rc == 0) {
- nsp->smk_packet = ssp->smk_out;
- ssp->smk_packet = osp->smk_out;
+ nsp->smk_packet = ssp->smk_out->smk_known;
+ ssp->smk_packet = osp->smk_out->smk_known;
}
return rc;
@@ -2770,8 +3003,8 @@ static int smack_unix_may_send(struct socket *sock, struct socket *other)
{
struct socket_smack *ssp = sock->sk->sk_security;
struct socket_smack *osp = other->sk->sk_security;
+ struct smack_known *skp;
struct smk_audit_info ad;
- int rc = 0;
#ifdef CONFIG_AUDIT
struct lsm_network_audit net;
@@ -2780,10 +3013,11 @@ static int smack_unix_may_send(struct socket *sock, struct socket *other)
smk_ad_setfield_u_net_sk(&ad, other->sk);
#endif
- if (!smack_privileged(CAP_MAC_OVERRIDE))
- rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
+ if (smack_privileged(CAP_MAC_OVERRIDE))
+ return 0;
- return rc;
+ skp = ssp->smk_out;
+ return smk_access(skp, osp->smk_in, MAY_WRITE, &ad);
}
/**
@@ -2792,22 +3026,32 @@ static int smack_unix_may_send(struct socket *sock, struct socket *other)
* @msg: the message
* @size: the size of the message
*
- * Return 0 if the current subject can write to the destination
- * host. This is only a question if the destination is a single
- * label host.
+ * Return 0 if the current subject can write to the destination host.
+ * For IPv4 this is only a question if the destination is a single label host.
+ * For IPv6 this is a check against the label of the port.
*/
static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
int size)
{
struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
+ struct sockaddr *sap = (struct sockaddr *) msg->msg_name;
+ int rc = 0;
/*
* Perfectly reasonable for this to be NULL
*/
- if (sip == NULL || sip->sin_family != AF_INET)
+ if (sip == NULL)
return 0;
- return smack_netlabel_send(sock->sk, sip);
+ switch (sip->sin_family) {
+ case AF_INET:
+ rc = smack_netlabel_send(sock->sk, sip);
+ break;
+ case AF_INET6:
+ rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
+ break;
+ }
+ return rc;
}
/**
@@ -2815,13 +3059,12 @@ static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
* @sap: netlabel secattr
* @ssp: socket security information
*
- * Returns a pointer to a Smack label found on the label list.
+ * Returns a pointer to a Smack label entry found on the label list.
*/
-static char *smack_from_secattr(struct netlbl_lsm_secattr *sap,
- struct socket_smack *ssp)
+static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
+ struct socket_smack *ssp)
{
- struct smack_known *kp;
- char *sp;
+ struct smack_known *skp;
int found = 0;
if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
@@ -2836,11 +3079,11 @@ static char *smack_from_secattr(struct netlbl_lsm_secattr *sap,
* ambient value.
*/
rcu_read_lock();
- list_for_each_entry(kp, &smack_known_list, list) {
- if (sap->attr.mls.lvl != kp->smk_netlabel.attr.mls.lvl)
+ list_for_each_entry(skp, &smack_known_list, list) {
+ if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
continue;
if (memcmp(sap->attr.mls.cat,
- kp->smk_netlabel.attr.mls.cat,
+ skp->smk_netlabel.attr.mls.cat,
SMK_CIPSOLEN) != 0)
continue;
found = 1;
@@ -2849,17 +3092,17 @@ static char *smack_from_secattr(struct netlbl_lsm_secattr *sap,
rcu_read_unlock();
if (found)
- return kp->smk_known;
+ return skp;
if (ssp != NULL && ssp->smk_in == smack_known_star.smk_known)
- return smack_known_web.smk_known;
- return smack_known_star.smk_known;
+ return &smack_known_web;
+ return &smack_known_star;
}
if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
/*
* Looks like a fallback, which gives us a secid.
*/
- sp = smack_from_secid(sap->attr.secid);
+ skp = smack_from_secid(sap->attr.secid);
/*
* This has got to be a bug because it is
* impossible to specify a fallback without
@@ -2867,8 +3110,8 @@ static char *smack_from_secattr(struct netlbl_lsm_secattr *sap,
* it has a secid, and the only way to get a
* secid is from a fallback.
*/
- BUG_ON(sp == NULL);
- return sp;
+ BUG_ON(skp == NULL);
+ return skp;
}
/*
* Without guidance regarding the smack value
@@ -2878,6 +3121,54 @@ static char *smack_from_secattr(struct netlbl_lsm_secattr *sap,
return smack_net_ambient;
}
+static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr *sap)
+{
+ struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap;
+ u8 nexthdr;
+ int offset;
+ int proto = -EINVAL;
+ struct ipv6hdr _ipv6h;
+ struct ipv6hdr *ip6;
+ __be16 frag_off;
+ struct tcphdr _tcph, *th;
+ struct udphdr _udph, *uh;
+ struct dccp_hdr _dccph, *dh;
+
+ sip->sin6_port = 0;
+
+ offset = skb_network_offset(skb);
+ ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
+ if (ip6 == NULL)
+ return -EINVAL;
+ sip->sin6_addr = ip6->saddr;
+
+ nexthdr = ip6->nexthdr;
+ offset += sizeof(_ipv6h);
+ offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
+ if (offset < 0)
+ return -EINVAL;
+
+ proto = nexthdr;
+ switch (proto) {
+ case IPPROTO_TCP:
+ th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
+ if (th != NULL)
+ sip->sin6_port = th->source;
+ break;
+ case IPPROTO_UDP:
+ uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
+ if (uh != NULL)
+ sip->sin6_port = uh->source;
+ break;
+ case IPPROTO_DCCP:
+ dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
+ if (dh != NULL)
+ sip->sin6_port = dh->dccph_sport;
+ break;
+ }
+ return proto;
+}
+
/**
* smack_socket_sock_rcv_skb - Smack packet delivery access check
* @sk: socket
@@ -2889,43 +3180,52 @@ 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;
- char *csp;
- int rc;
+ struct smack_known *skp;
+ struct sockaddr sadd;
+ int rc = 0;
struct smk_audit_info ad;
#ifdef CONFIG_AUDIT
struct lsm_network_audit net;
#endif
- if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
- return 0;
-
- /*
- * Translate what netlabel gave us.
- */
- netlbl_secattr_init(&secattr);
+ switch (sk->sk_family) {
+ case PF_INET:
+ /*
+ * Translate what netlabel gave us.
+ */
+ netlbl_secattr_init(&secattr);
- rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
- if (rc == 0)
- csp = smack_from_secattr(&secattr, ssp);
- else
- csp = smack_net_ambient;
+ rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
+ if (rc == 0)
+ skp = smack_from_secattr(&secattr, ssp);
+ else
+ skp = smack_net_ambient;
- netlbl_secattr_destroy(&secattr);
+ netlbl_secattr_destroy(&secattr);
#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;
- ipv4_skb_to_auditdata(skb, &ad.a, NULL);
+ 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;
+ ipv4_skb_to_auditdata(skb, &ad.a, NULL);
#endif
- /*
- * Receiving a packet requires that the other end
- * be able to write here. Read access is not required.
- * This is the simplist possible security model
- * for networking.
- */
- rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad);
- if (rc != 0)
- netlbl_skbuff_err(skb, rc, 0);
+ /*
+ * Receiving a packet requires that the other end
+ * be able to write here. Read access is not required.
+ * This is the simplist possible security model
+ * for networking.
+ */
+ rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
+ if (rc != 0)
+ netlbl_skbuff_err(skb, rc, 0);
+ break;
+ 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);
+ else
+ rc = 0;
+ break;
+ }
return rc;
}
@@ -2979,7 +3279,7 @@ static int smack_socket_getpeersec_dgram(struct socket *sock,
{
struct netlbl_lsm_secattr secattr;
struct socket_smack *ssp = NULL;
- char *sp;
+ struct smack_known *skp;
int family = PF_UNSPEC;
u32 s = 0; /* 0 is the invalid secid */
int rc;
@@ -2995,7 +3295,7 @@ static int smack_socket_getpeersec_dgram(struct socket *sock,
if (family == PF_UNIX) {
ssp = sock->sk->sk_security;
- s = smack_to_secid(ssp->smk_out);
+ s = ssp->smk_out->smk_secid;
} else if (family == PF_INET || family == PF_INET6) {
/*
* Translate what netlabel gave us.
@@ -3005,8 +3305,8 @@ static int smack_socket_getpeersec_dgram(struct socket *sock,
netlbl_secattr_init(&secattr);
rc = netlbl_skbuff_getattr(skb, family, &secattr);
if (rc == 0) {
- sp = smack_from_secattr(&secattr, ssp);
- s = smack_to_secid(sp);
+ skp = smack_from_secattr(&secattr, ssp);
+ s = skp->smk_secid;
}
netlbl_secattr_destroy(&secattr);
}
@@ -3027,13 +3327,15 @@ static int smack_socket_getpeersec_dgram(struct socket *sock,
static void smack_sock_graft(struct sock *sk, struct socket *parent)
{
struct socket_smack *ssp;
+ struct smack_known *skp = smk_of_current();
if (sk == NULL ||
(sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
return;
ssp = sk->sk_security;
- ssp->smk_in = ssp->smk_out = smk_of_current();
+ ssp->smk_in = skp->smk_known;
+ ssp->smk_out = skp;
/* cssp->smk_packet is already set in smack_inet_csk_clone() */
}
@@ -3055,7 +3357,6 @@ static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
struct netlbl_lsm_secattr secattr;
struct sockaddr_in addr;
struct iphdr *hdr;
- char *sp;
char *hsp;
int rc;
struct smk_audit_info ad;
@@ -3063,16 +3364,24 @@ static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
struct lsm_network_audit net;
#endif
- /* handle mapped IPv4 packets arriving via IPv6 sockets */
- if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
- family = PF_INET;
+ if (family == PF_INET6) {
+ /*
+ * Handle mapped IPv4 packets arriving
+ * via IPv6 sockets. Don't set up netlabel
+ * processing on IPv6.
+ */
+ if (skb->protocol == htons(ETH_P_IP))
+ family = PF_INET;
+ else
+ return 0;
+ }
netlbl_secattr_init(&secattr);
rc = netlbl_skbuff_getattr(skb, family, &secattr);
if (rc == 0)
- sp = smack_from_secattr(&secattr, ssp);
+ skp = smack_from_secattr(&secattr, ssp);
else
- sp = smack_known_huh.smk_known;
+ skp = &smack_known_huh;
netlbl_secattr_destroy(&secattr);
#ifdef CONFIG_AUDIT
@@ -3085,7 +3394,7 @@ static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
* Receiving a packet requires that the other end be able to write
* here. Read access is not required.
*/
- rc = smk_access(sp, ssp->smk_in, MAY_WRITE, &ad);
+ rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
if (rc != 0)
return rc;
@@ -3093,7 +3402,7 @@ static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
* 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(sp);
+ req->peer_secid = skp->smk_secid;
/*
* We need to decide if we want to label the incoming connection here
@@ -3106,10 +3415,9 @@ static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
hsp = smack_host_label(&addr);
rcu_read_unlock();
- if (hsp == NULL) {
- skp = smk_find_entry(sp);
+ if (hsp == NULL)
rc = netlbl_req_setattr(req, &skp->smk_netlabel);
- } else
+ else
netlbl_req_delattr(req);
return rc;
@@ -3126,10 +3434,12 @@ static void smack_inet_csk_clone(struct sock *sk,
const struct request_sock *req)
{
struct socket_smack *ssp = sk->sk_security;
+ struct smack_known *skp;
- if (req->peer_secid != 0)
- ssp->smk_packet = smack_from_secid(req->peer_secid);
- else
+ if (req->peer_secid != 0) {
+ skp = smack_from_secid(req->peer_secid);
+ ssp->smk_packet = skp->smk_known;
+ } else
ssp->smk_packet = NULL;
}
@@ -3155,7 +3465,9 @@ static void smack_inet_csk_clone(struct sock *sk,
static int smack_key_alloc(struct key *key, const struct cred *cred,
unsigned long flags)
{
- key->security = smk_of_task(cred->security);
+ struct smack_known *skp = smk_of_task(cred->security);
+
+ key->security = skp->smk_known;
return 0;
}
@@ -3184,7 +3496,7 @@ static int smack_key_permission(key_ref_t key_ref,
{
struct key *keyp;
struct smk_audit_info ad;
- char *tsp = smk_of_task(cred->security);
+ struct smack_known *tkp = smk_of_task(cred->security);
keyp = key_ref_to_ptr(key_ref);
if (keyp == NULL)
@@ -3198,15 +3510,14 @@ static int smack_key_permission(key_ref_t key_ref,
/*
* This should not occur
*/
- if (tsp == NULL)
+ if (tkp == NULL)
return -EACCES;
#ifdef CONFIG_AUDIT
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
ad.a.u.key_struct.key = keyp->serial;
ad.a.u.key_struct.key_desc = keyp->description;
#endif
- return smk_access(tsp, keyp->security,
- MAY_READWRITE, &ad);
+ return smk_access(tkp, keyp->security, MAY_READWRITE, &ad);
}
#endif /* CONFIG_KEYS */
@@ -3288,7 +3599,7 @@ static int smack_audit_rule_known(struct audit_krule *krule)
static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
struct audit_context *actx)
{
- char *smack;
+ struct smack_known *skp;
char *rule = vrule;
if (!rule) {
@@ -3300,7 +3611,7 @@ static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
return 0;
- smack = smack_from_secid(secid);
+ skp = smack_from_secid(secid);
/*
* No need to do string comparisons. If a match occurs,
@@ -3308,9 +3619,9 @@ static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
* label.
*/
if (op == Audit_equal)
- return (rule == smack);
+ return (rule == skp->smk_known);
if (op == Audit_not_equal)
- return (rule != smack);
+ return (rule != skp->smk_known);
return 0;
}
@@ -3338,11 +3649,11 @@ static void smack_audit_rule_free(void *vrule)
*/
static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
{
- char *sp = smack_from_secid(secid);
+ struct smack_known *skp = smack_from_secid(secid);
if (secdata)
- *secdata = sp;
- *seclen = strlen(sp);
+ *secdata = skp->smk_known;
+ *seclen = strlen(skp->smk_known);
return 0;
}
@@ -3498,6 +3809,7 @@ struct security_operations smack_ops = {
.unix_may_send = smack_unix_may_send,
.socket_post_create = smack_socket_post_create,
+ .socket_bind = smack_socket_bind,
.socket_connect = smack_socket_connect,
.socket_sendmsg = smack_socket_sendmsg,
.socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
@@ -3577,8 +3889,8 @@ static __init int smack_init(void)
if (!security_module_enable(&smack_ops))
return 0;
- tsp = new_task_smack(smack_known_floor.smk_known,
- smack_known_floor.smk_known, GFP_KERNEL);
+ tsp = new_task_smack(&smack_known_floor, &smack_known_floor,
+ GFP_KERNEL);
if (tsp == NULL)
return -ENOMEM;
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index 53a08b85bda..ab167037b2d 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -66,7 +66,7 @@ static DEFINE_MUTEX(smk_netlbladdr_lock);
* If it isn't somehow marked, use this.
* It can be reset via smackfs/ambient
*/
-char *smack_net_ambient;
+struct smack_known *smack_net_ambient;
/*
* This is the level in a CIPSO header that indicates a
@@ -112,7 +112,7 @@ struct smack_master_list {
LIST_HEAD(smack_rule_list);
struct smack_parsed_rule {
- char *smk_subject;
+ struct smack_known *smk_subject;
char *smk_object;
int smk_access1;
int smk_access2;
@@ -163,9 +163,11 @@ static inline void smack_catset_bit(unsigned int cat, char *catsetp)
*/
static void smk_netlabel_audit_set(struct netlbl_audit *nap)
{
+ struct smack_known *skp = smk_of_current();
+
nap->loginuid = audit_get_loginuid(current);
nap->sessionid = audit_get_sessionid(current);
- nap->secid = smack_to_secid(smk_of_current());
+ nap->secid = skp->smk_secid;
}
/*
@@ -306,7 +308,7 @@ static int smk_fill_rule(const char *subject, const char *object,
struct smack_known *skp;
if (import) {
- rule->smk_subject = smk_import(subject, len);
+ rule->smk_subject = smk_import_entry(subject, len);
if (rule->smk_subject == NULL)
return -1;
@@ -321,7 +323,7 @@ static int smk_fill_rule(const char *subject, const char *object,
kfree(cp);
if (skp == NULL)
return -1;
- rule->smk_subject = skp->smk_known;
+ rule->smk_subject = skp;
cp = smk_parse_smack(object, len);
if (cp == NULL)
@@ -445,7 +447,6 @@ static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
struct list_head *rule_list,
struct mutex *rule_lock, int format)
{
- struct smack_known *skp;
struct smack_parsed_rule *rule;
char *data;
int datalen;
@@ -505,12 +506,10 @@ static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
goto out_free_rule;
}
-
if (rule_list == NULL) {
load = 1;
- skp = smk_find_entry(rule->smk_subject);
- rule_list = &skp->smk_rules;
- rule_lock = &skp->smk_rules_lock;
+ rule_list = &rule->smk_subject->smk_rules;
+ rule_lock = &rule->smk_subject->smk_rules_lock;
}
rc = smk_set_access(rule, rule_list, rule_lock, load);
@@ -579,13 +578,14 @@ static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
* because you should expect to be able to write
* anything you read back.
*/
- if (strlen(srp->smk_subject) >= max || strlen(srp->smk_object) >= max)
+ if (strlen(srp->smk_subject->smk_known) >= max ||
+ strlen(srp->smk_object) >= max)
return;
if (srp->smk_access == 0)
return;
- seq_printf(s, "%s %s", srp->smk_subject, srp->smk_object);
+ seq_printf(s, "%s %s", srp->smk_subject->smk_known, srp->smk_object);
seq_putc(s, ' ');
@@ -738,9 +738,9 @@ static void smk_unlbl_ambient(char *oldambient)
__func__, __LINE__, rc);
}
if (smack_net_ambient == NULL)
- smack_net_ambient = smack_known_floor.smk_known;
+ smack_net_ambient = &smack_known_floor;
- rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, PF_INET,
+ rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET,
NULL, NULL, &nai);
if (rc != 0)
printk(KERN_WARNING "%s:%d add rc = %d\n",
@@ -881,7 +881,7 @@ static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
if (format == SMK_FIXED24_FMT)
rule += SMK_LABELLEN;
else
- rule += strlen(skp->smk_known);
+ rule += strlen(skp->smk_known) + 1;
ret = sscanf(rule, "%d", &maplevel);
if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
@@ -1535,11 +1535,12 @@ static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
*/
mutex_lock(&smack_ambient_lock);
- asize = strlen(smack_net_ambient) + 1;
+ asize = strlen(smack_net_ambient->smk_known) + 1;
if (cn >= asize)
rc = simple_read_from_buffer(buf, cn, ppos,
- smack_net_ambient, asize);
+ smack_net_ambient->smk_known,
+ asize);
else
rc = -EINVAL;
@@ -1560,8 +1561,8 @@ static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
+ struct smack_known *skp;
char *oldambient;
- char *smack = NULL;
char *data;
int rc = count;
@@ -1577,16 +1578,16 @@ static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
goto out;
}
- smack = smk_import(data, count);
- if (smack == NULL) {
+ skp = smk_import_entry(data, count);
+ if (skp == NULL) {
rc = -EINVAL;
goto out;
}
mutex_lock(&smack_ambient_lock);
- oldambient = smack_net_ambient;
- smack_net_ambient = smack;
+ oldambient = smack_net_ambient->smk_known;
+ smack_net_ambient = skp;
smk_unlbl_ambient(oldambient);
mutex_unlock(&smack_ambient_lock);
@@ -1645,7 +1646,7 @@ static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
char *data;
- char *sp = smk_of_task(current->cred->security);
+ struct smack_known *skp = smk_of_task(current->cred->security);
int rc = count;
if (!smack_privileged(CAP_MAC_ADMIN))
@@ -1656,7 +1657,7 @@ static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
* explicitly for clarity. The smk_access() implementation
* would use smk_access(smack_onlycap, MAY_WRITE)
*/
- if (smack_onlycap != NULL && smack_onlycap != sp)
+ if (smack_onlycap != NULL && smack_onlycap != skp->smk_known)
return -EPERM;
data = kzalloc(count, GFP_KERNEL);
@@ -1866,8 +1867,8 @@ static ssize_t smk_user_access(struct file *file, const char __user *buf,
if (res)
return -EINVAL;
- res = smk_access(rule.smk_subject, rule.smk_object, rule.smk_access1,
- NULL);
+ res = smk_access(rule.smk_subject, rule.smk_object,
+ rule.smk_access1, NULL);
data[0] = res == 0 ? '1' : '0';
data[1] = '\0';
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-02 04:00:23 +0000