*
* This file contains the smack hook function implementations.
*
- * Author:
+ * Authors:
* Casey Schaufler <casey@schaufler-ca.com>
+ * Jarkko Sakkinen <ext-jarkko.2.sakkinen@nokia.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>
+ * Copyright (C) 2010 Nokia 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,
#define task_security(task) (task_cred_xxx((task), security))
+#define TRANS_TRUE "TRUE"
+#define TRANS_TRUE_SIZE 4
+
/**
* smk_fetch - Fetch the smack label from a file.
* @ip: a pointer to the inode
* 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(struct inode *ip, struct dentry *dp)
+static char *smk_fetch(const char *name, struct inode *ip, struct dentry *dp)
{
int rc;
char in[SMK_LABELLEN];
if (ip->i_op->getxattr == NULL)
return NULL;
- rc = ip->i_op->getxattr(dp, XATTR_NAME_SMACK, in, SMK_LABELLEN);
+ rc = ip->i_op->getxattr(dp, name, in, SMK_LABELLEN);
if (rc < 0)
return NULL;
if (rc != 0)
return rc;
- sp = current_security();
- tsp = task_security(ctp);
+ sp = smk_of_current();
+ tsp = smk_of_task(task_security(ctp));
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
smk_ad_setfield_u_tsk(&ad, ctp);
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
smk_ad_setfield_u_tsk(&ad, ptp);
- sp = current_security();
- tsp = task_security(ptp);
+ sp = smk_of_current();
+ tsp = smk_of_task(task_security(ptp));
/* we won't log here, because rc can be overriden */
rc = smk_access(tsp, sp, MAY_READWRITE, NULL);
if (rc != 0 && has_capability(ptp, CAP_MAC_OVERRIDE))
static int smack_syslog(int typefrom_file)
{
int rc = 0;
- char *sp = current_security();
+ char *sp = smk_of_current();
if (capable(CAP_MAC_OVERRIDE))
return 0;
return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
}
+/*
+ * BPRM hooks
+ */
+
+static int smack_bprm_set_creds(struct linux_binprm *bprm)
+{
+ struct task_smack *tsp = bprm->cred->security;
+ struct inode_smack *isp;
+ struct dentry *dp;
+ int rc;
+
+ rc = cap_bprm_set_creds(bprm);
+ if (rc != 0)
+ return rc;
+
+ if (bprm->cred_prepared)
+ return 0;
+
+ if (bprm->file == NULL || bprm->file->f_dentry == NULL)
+ return 0;
+
+ dp = bprm->file->f_dentry;
+
+ if (dp->d_inode == NULL)
+ return 0;
+
+ isp = dp->d_inode->i_security;
+
+ if (isp->smk_task != NULL)
+ tsp->smk_task = isp->smk_task;
+
+ return 0;
+}
+
/*
* Inode hooks
*/
*/
static int smack_inode_alloc_security(struct inode *inode)
{
- inode->i_security = new_inode_smack(current_security());
+ inode->i_security = new_inode_smack(smk_of_current());
if (inode->i_security == NULL)
return -ENOMEM;
return 0;
char **name, void **value, size_t *len)
{
char *isp = smk_of_inode(inode);
+ char *dsp = smk_of_inode(dir);
+ u32 may;
if (name) {
*name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL);
}
if (value) {
+ may = smk_access_entry(smk_of_current(), dsp);
+
+ /*
+ * If the access rule allows transmutation and
+ * the directory requests transmutation then
+ * by all means transmute.
+ */
+ if (((may & MAY_TRANSMUTE) != 0) && smk_inode_transmutable(dir))
+ isp = dsp;
+
*value = kstrdup(isp, GFP_KERNEL);
if (*value == NULL)
return -ENOMEM;
if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
- strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
+ strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
+ strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
if (!capable(CAP_MAC_ADMIN))
rc = -EPERM;
/*
if (size == 0 || size >= SMK_LABELLEN ||
smk_import(value, size) == NULL)
rc = -EINVAL;
+ } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
+ if (!capable(CAP_MAC_ADMIN))
+ rc = -EPERM;
+ if (size != TRANS_TRUE_SIZE ||
+ strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
+ rc = -EINVAL;
} else
rc = cap_inode_setxattr(dentry, name, value, size, flags);
static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
- struct inode_smack *isp;
char *nsp;
+ struct inode_smack *isp = dentry->d_inode->i_security;
- /*
- * Not SMACK
- */
- if (strcmp(name, XATTR_NAME_SMACK))
- return;
-
- isp = dentry->d_inode->i_security;
-
- /*
- * No locking is done here. This is a pointer
- * assignment.
- */
- nsp = smk_import(value, size);
- if (nsp != NULL)
- isp->smk_inode = nsp;
- else
- isp->smk_inode = smack_known_invalid.smk_known;
+ if (strcmp(name, XATTR_NAME_SMACK) == 0) {
+ nsp = smk_import(value, size);
+ if (nsp != NULL)
+ isp->smk_inode = nsp;
+ 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;
+ else
+ isp->smk_task = smack_known_invalid.smk_known;
+ } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
+ isp->smk_flags |= SMK_INODE_TRANSMUTE;
return;
}
*/
static int smack_inode_removexattr(struct dentry *dentry, const char *name)
{
+ struct inode_smack *isp;
struct smk_audit_info ad;
int rc = 0;
if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
- strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
+ strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
+ strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
+ strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
if (!capable(CAP_MAC_ADMIN))
rc = -EPERM;
} else
if (rc == 0)
rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
+ if (rc == 0) {
+ isp = dentry->d_inode->i_security;
+ isp->smk_task = NULL;
+ }
+
return rc;
}
*/
static int smack_file_alloc_security(struct file *file)
{
- file->f_security = current_security();
+ file->f_security = smk_of_current();
return 0;
}
*/
static int smack_file_set_fowner(struct file *file)
{
- file->f_security = current_security();
+ file->f_security = smk_of_current();
return 0;
}
{
struct file *file;
int rc;
- char *tsp = tsk->cred->security;
+ char *tsp = smk_of_task(tsk->cred->security);
struct smk_audit_info ad;
/*
*/
static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
{
- cred->security = NULL;
+ cred->security = kzalloc(sizeof(struct task_smack), gfp);
+ if (cred->security == NULL)
+ return -ENOMEM;
return 0;
}
*/
static void smack_cred_free(struct cred *cred)
{
- cred->security = NULL;
+ kfree(cred->security);
}
/**
static int smack_cred_prepare(struct cred *new, const struct cred *old,
gfp_t gfp)
{
- new->security = old->security;
+ struct task_smack *old_tsp = old->security;
+ struct task_smack *new_tsp;
+
+ new_tsp = kzalloc(sizeof(struct task_smack), gfp);
+ if (new_tsp == NULL)
+ return -ENOMEM;
+
+ new_tsp->smk_task = old_tsp->smk_task;
+ new_tsp->smk_forked = old_tsp->smk_task;
+ new->security = new_tsp;
return 0;
}
*/
static void smack_cred_transfer(struct cred *new, const struct cred *old)
{
- new->security = old->security;
+ struct task_smack *old_tsp = old->security;
+ struct task_smack *new_tsp = new->security;
+
+ new_tsp->smk_task = old_tsp->smk_task;
+ new_tsp->smk_forked = old_tsp->smk_task;
}
/**
*/
static int smack_kernel_act_as(struct cred *new, u32 secid)
{
+ struct task_smack *new_tsp = new->security;
char *smack = smack_from_secid(secid);
if (smack == NULL)
return -EINVAL;
- new->security = smack;
+ new_tsp->smk_task = smack;
return 0;
}
struct inode *inode)
{
struct inode_smack *isp = inode->i_security;
+ struct task_smack *tsp = new->security;
- new->security = isp->smk_inode;
+ tsp->smk_forked = isp->smk_inode;
+ tsp->smk_task = isp->smk_inode;
return 0;
}
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
smk_ad_setfield_u_tsk(&ad, p);
- return smk_curacc(task_security(p), access, &ad);
+ return smk_curacc(smk_of_task(task_security(p)), access, &ad);
}
/**
*/
static void smack_task_getsecid(struct task_struct *p, u32 *secid)
{
- *secid = smack_to_secid(task_security(p));
+ *secid = smack_to_secid(smk_of_task(task_security(p)));
}
/**
* can write the receiver.
*/
if (secid == 0)
- return smk_curacc(task_security(p), MAY_WRITE, &ad);
+ return smk_curacc(smk_of_task(task_security(p)), 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), task_security(p),
- MAY_WRITE, &ad);
+ return smk_access(smack_from_secid(secid),
+ smk_of_task(task_security(p)), MAY_WRITE, &ad);
}
/**
static int smack_task_wait(struct task_struct *p)
{
struct smk_audit_info ad;
- char *sp = current_security();
- char *tsp = task_security(p);
+ char *sp = smk_of_current();
+ char *tsp = smk_of_forked(task_security(p));
int rc;
/* we don't log here, we can be overriden */
- rc = smk_access(sp, tsp, MAY_WRITE, NULL);
+ rc = smk_access(tsp, sp, MAY_WRITE, NULL);
if (rc == 0)
goto out_log;
out_log:
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
smk_ad_setfield_u_tsk(&ad, p);
- smack_log(sp, tsp, MAY_WRITE, rc, &ad);
+ smack_log(tsp, sp, MAY_WRITE, rc, &ad);
return rc;
}
static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
{
struct inode_smack *isp = inode->i_security;
- isp->smk_inode = task_security(p);
+ isp->smk_inode = smk_of_task(task_security(p));
}
/*
*/
static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
{
- char *csp = current_security();
+ char *csp = smk_of_current();
struct socket_smack *ssp;
ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
ssp->smk_in = sp;
else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
ssp->smk_out = sp;
- rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
- if (rc != 0)
- printk(KERN_WARNING "Smack: \"%s\" netlbl error %d.\n",
- __func__, -rc);
+ if (sock->sk->sk_family != PF_UNIX) {
+ rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
+ if (rc != 0)
+ printk(KERN_WARNING
+ "Smack: \"%s\" netlbl error %d.\n",
+ __func__, -rc);
+ }
} else
return -EOPNOTSUPP;
*/
static int smack_msg_msg_alloc_security(struct msg_msg *msg)
{
- msg->security = current_security();
+ msg->security = smk_of_current();
return 0;
}
{
struct kern_ipc_perm *isp = &shp->shm_perm;
- isp->security = current_security();
+ isp->security = smk_of_current();
return 0;
}
{
struct kern_ipc_perm *isp = &sma->sem_perm;
- isp->security = current_security();
+ isp->security = smk_of_current();
return 0;
}
{
struct kern_ipc_perm *kisp = &msq->q_perm;
- kisp->security = current_security();
+ kisp->security = smk_of_current();
return 0;
}
struct super_block *sbp;
struct superblock_smack *sbsp;
struct inode_smack *isp;
- char *csp = current_security();
+ char *csp = smk_of_current();
char *fetched;
char *final;
+ char trattr[TRANS_TRUE_SIZE];
+ int transflag = 0;
struct dentry *dp;
if (inode == NULL)
break;
case SOCKFS_MAGIC:
/*
- * Casey says sockets get the smack of the task.
+ * Socket access is controlled by the socket
+ * structures associated with the task involved.
*/
- final = csp;
+ final = smack_known_star.smk_known;
break;
case PROC_SUPER_MAGIC:
/*
/*
* This isn't an understood special case.
* Get the value from the xattr.
- *
+ */
+
+ /*
+ * UNIX domain sockets use lower level socket data.
+ */
+ if (S_ISSOCK(inode->i_mode)) {
+ final = smack_known_star.smk_known;
+ break;
+ }
+ /*
* No xattr support means, alas, no SMACK label.
* Use the aforeapplied default.
* It would be curious if the label of the task
* Get the dentry for xattr.
*/
dp = dget(opt_dentry);
- fetched = smk_fetch(inode, dp);
- if (fetched != NULL)
+ fetched = smk_fetch(XATTR_NAME_SMACK, inode, dp);
+ if (fetched != NULL) {
final = fetched;
+ if (S_ISDIR(inode->i_mode)) {
+ trattr[0] = '\0';
+ inode->i_op->getxattr(dp,
+ XATTR_NAME_SMACKTRANSMUTE,
+ trattr, TRANS_TRUE_SIZE);
+ if (strncmp(trattr, TRANS_TRUE,
+ TRANS_TRUE_SIZE) == 0)
+ transflag = SMK_INODE_TRANSMUTE;
+ }
+ }
+ isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
+
dput(dp);
break;
}
else
isp->smk_inode = final;
- isp->smk_flags |= SMK_INODE_INSTANT;
+ isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
unlockandout:
mutex_unlock(&isp->smk_lock);
if (strcmp(name, "current") != 0)
return -EINVAL;
- cp = kstrdup(task_security(p), GFP_KERNEL);
+ cp = kstrdup(smk_of_task(task_security(p)), GFP_KERNEL);
if (cp == NULL)
return -ENOMEM;
static int smack_setprocattr(struct task_struct *p, char *name,
void *value, size_t size)
{
+ struct task_smack *tsp;
+ struct task_smack *oldtsp;
struct cred *new;
char *newsmack;
if (newsmack == smack_known_web.smk_known)
return -EPERM;
+ oldtsp = p->cred->security;
new = prepare_creds();
if (new == NULL)
return -ENOMEM;
- new->security = newsmack;
+ tsp = kzalloc(sizeof(struct task_smack), GFP_KERNEL);
+ if (tsp == NULL) {
+ kfree(new);
+ return -ENOMEM;
+ }
+ tsp->smk_task = newsmack;
+ tsp->smk_forked = oldtsp->smk_forked;
+ new->security = tsp;
commit_creds(new);
return size;
}
/**
* smack_unix_stream_connect - Smack access on UDS
- * @sock: one socket
- * @other: the other socket
+ * @sock: one sock
+ * @other: the other sock
* @newsk: unused
*
* Return 0 if a subject with the smack of sock could access
* an object with the smack of other, otherwise an error code
*/
-static int smack_unix_stream_connect(struct socket *sock,
- struct socket *other, struct sock *newsk)
+static int smack_unix_stream_connect(struct sock *sock,
+ struct sock *other, struct sock *newsk)
{
- struct inode *sp = SOCK_INODE(sock);
- struct inode *op = SOCK_INODE(other);
+ struct socket_smack *ssp = sock->sk_security;
+ struct socket_smack *osp = other->sk_security;
struct smk_audit_info ad;
+ int rc = 0;
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
- smk_ad_setfield_u_net_sk(&ad, other->sk);
- return smk_access(smk_of_inode(sp), smk_of_inode(op),
- MAY_READWRITE, &ad);
+ smk_ad_setfield_u_net_sk(&ad, other);
+
+ if (!capable(CAP_MAC_OVERRIDE))
+ rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
+
+ return rc;
}
/**
*/
static int smack_unix_may_send(struct socket *sock, struct socket *other)
{
- struct inode *sp = SOCK_INODE(sock);
- struct inode *op = SOCK_INODE(other);
+ struct socket_smack *ssp = sock->sk->sk_security;
+ struct socket_smack *osp = other->sk->sk_security;
struct smk_audit_info ad;
+ int rc = 0;
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
smk_ad_setfield_u_net_sk(&ad, other->sk);
- return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_WRITE, &ad);
+
+ if (!capable(CAP_MAC_OVERRIDE))
+ rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
+
+ return rc;
}
/**
/**
* smack_socket_getpeersec_dgram - pull in packet label
- * @sock: the socket
+ * @sock: the peer socket
* @skb: packet data
* @secid: pointer to where to put the secid of the packet
*
{
struct netlbl_lsm_secattr secattr;
- struct sock *sk;
+ struct socket_smack *sp;
char smack[SMK_LABELLEN];
- int family = PF_INET;
- u32 s;
+ int family = PF_UNSPEC;
+ u32 s = 0; /* 0 is the invalid secid */
int rc;
- /*
- * Only works for families with packets.
- */
- if (sock != NULL) {
- sk = sock->sk;
- if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
- return 0;
- family = sk->sk_family;
+ if (skb != NULL) {
+ if (skb->protocol == htons(ETH_P_IP))
+ family = PF_INET;
+ else if (skb->protocol == htons(ETH_P_IPV6))
+ family = PF_INET6;
}
- /*
- * Translate what netlabel gave us.
- */
- netlbl_secattr_init(&secattr);
- rc = netlbl_skbuff_getattr(skb, family, &secattr);
- if (rc == 0)
- smack_from_secattr(&secattr, smack);
- netlbl_secattr_destroy(&secattr);
+ if (family == PF_UNSPEC && sock != NULL)
+ family = sock->sk->sk_family;
- /*
- * Give up if we couldn't get anything
- */
- if (rc != 0)
- return rc;
-
- s = smack_to_secid(smack);
+ if (family == PF_UNIX) {
+ sp = sock->sk->sk_security;
+ s = smack_to_secid(sp->smk_out);
+ } else if (family == PF_INET || family == PF_INET6) {
+ /*
+ * Translate what netlabel gave us.
+ */
+ netlbl_secattr_init(&secattr);
+ rc = netlbl_skbuff_getattr(skb, family, &secattr);
+ if (rc == 0) {
+ smack_from_secattr(&secattr, smack);
+ s = smack_to_secid(smack);
+ }
+ netlbl_secattr_destroy(&secattr);
+ }
+ *secid = s;
if (s == 0)
return -EINVAL;
-
- *secid = s;
return 0;
}
return;
ssp = sk->sk_security;
- ssp->smk_in = ssp->smk_out = current_security();
+ ssp->smk_in = ssp->smk_out = smk_of_current();
/* cssp->smk_packet is already set in smack_inet_csk_clone() */
}
static int smack_key_alloc(struct key *key, const struct cred *cred,
unsigned long flags)
{
- key->security = cred->security;
+ key->security = smk_of_task(cred->security);
return 0;
}
{
struct key *keyp;
struct smk_audit_info ad;
+ char *tsp = smk_of_task(cred->security);
keyp = key_ref_to_ptr(key_ref);
if (keyp == NULL)
/*
* This should not occur
*/
- if (cred->security == NULL)
+ if (tsp == 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(cred->security, keyp->security,
+ return smk_access(tsp, keyp->security,
MAY_READWRITE, &ad);
}
#endif /* CONFIG_KEYS */
.sb_mount = smack_sb_mount,
.sb_umount = smack_sb_umount,
+ .bprm_set_creds = smack_bprm_set_creds,
+
.inode_alloc_security = smack_inode_alloc_security,
.inode_free_security = smack_inode_free_security,
.inode_init_security = smack_inode_init_security,
static __init int smack_init(void)
{
struct cred *cred;
+ struct task_smack *tsp;
- if (!security_module_enable(&smack_ops))
+ tsp = kzalloc(sizeof(struct task_smack), GFP_KERNEL);
+ if (tsp == NULL)
+ return -ENOMEM;
+
+ if (!security_module_enable(&smack_ops)) {
+ kfree(tsp);
return 0;
+ }
printk(KERN_INFO "Smack: Initializing.\n");
* Set the security state for the initial task.
*/
cred = (struct cred *) current->cred;
- cred->security = &smack_known_floor.smk_known;
+ tsp->smk_forked = smack_known_floor.smk_known;
+ tsp->smk_task = smack_known_floor.smk_known;
+ cred->security = tsp;
/* initialize the smack_know_list */
init_smack_know_list();
projects / mv-sheeva.git / blobdiff