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-rw-r--r--security/selinux/hooks.c15
-rw-r--r--security/selinux/include/security.h8
-rw-r--r--security/selinux/ss/avtab.h22
-rw-r--r--security/selinux/ss/policydb.c130
-rw-r--r--security/selinux/ss/policydb.h14
-rw-r--r--security/selinux/ss/services.c45
6 files changed, 197 insertions, 37 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 099bbd07732..6ae19fd28be 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1301,10 +1301,8 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
/* Try to obtain a transition SID. */
isec->sclass = inode_mode_to_security_class(inode->i_mode);
- rc = security_transition_sid(isec->task_sid,
- sbsec->sid,
- isec->sclass,
- &sid);
+ rc = security_transition_sid(isec->task_sid, sbsec->sid,
+ isec->sclass, NULL, &sid);
if (rc)
goto out_unlock;
isec->sid = sid;
@@ -1579,7 +1577,7 @@ static int may_create(struct inode *dir,
return rc;
if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) {
- rc = security_transition_sid(sid, dsec->sid, tclass, &newsid);
+ rc = security_transition_sid(sid, dsec->sid, tclass, NULL, &newsid);
if (rc)
return rc;
}
@@ -2061,7 +2059,8 @@ static int selinux_bprm_set_creds(struct linux_binprm *bprm)
} else {
/* Check for a default transition on this program. */
rc = security_transition_sid(old_tsec->sid, isec->sid,
- SECCLASS_PROCESS, &new_tsec->sid);
+ SECCLASS_PROCESS, NULL,
+ &new_tsec->sid);
if (rc)
return rc;
}
@@ -2532,7 +2531,7 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
else if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) {
rc = security_transition_sid(sid, dsec->sid,
inode_mode_to_security_class(inode->i_mode),
- &newsid);
+ qstr, &newsid);
if (rc) {
printk(KERN_WARNING "%s: "
"security_transition_sid failed, rc=%d (dev=%s "
@@ -4845,7 +4844,7 @@ static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
* message queue this message will be stored in
*/
rc = security_transition_sid(sid, isec->sid, SECCLASS_MSG,
- &msec->sid);
+ NULL, &msec->sid);
if (rc)
return rc;
}
diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h
index 671273eb111..348eb00cb66 100644
--- a/security/selinux/include/security.h
+++ b/security/selinux/include/security.h
@@ -8,6 +8,7 @@
#ifndef _SELINUX_SECURITY_H_
#define _SELINUX_SECURITY_H_
+#include <linux/dcache.h>
#include <linux/magic.h>
#include <linux/types.h>
#include "flask.h"
@@ -28,13 +29,14 @@
#define POLICYDB_VERSION_POLCAP 22
#define POLICYDB_VERSION_PERMISSIVE 23
#define POLICYDB_VERSION_BOUNDARY 24
+#define POLICYDB_VERSION_FILENAME_TRANS 25
/* Range of policy versions we understand*/
#define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE
#ifdef CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX
#define POLICYDB_VERSION_MAX CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX_VALUE
#else
-#define POLICYDB_VERSION_MAX POLICYDB_VERSION_BOUNDARY
+#define POLICYDB_VERSION_MAX POLICYDB_VERSION_FILENAME_TRANS
#endif
/* Mask for just the mount related flags */
@@ -106,8 +108,8 @@ void security_compute_av(u32 ssid, u32 tsid,
void security_compute_av_user(u32 ssid, u32 tsid,
u16 tclass, struct av_decision *avd);
-int security_transition_sid(u32 ssid, u32 tsid,
- u16 tclass, u32 *out_sid);
+int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
+ const struct qstr *qstr, u32 *out_sid);
int security_transition_sid_user(u32 ssid, u32 tsid,
u16 tclass, u32 *out_sid);
diff --git a/security/selinux/ss/avtab.h b/security/selinux/ss/avtab.h
index 3417f9cc1cb..63ce2f9e441 100644
--- a/security/selinux/ss/avtab.h
+++ b/security/selinux/ss/avtab.h
@@ -14,7 +14,7 @@
*
* Copyright (C) 2003 Tresys Technology, LLC
* This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
+ * it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 2.
*
* Updated: Yuichi Nakamura <ynakam@hitachisoft.jp>
@@ -27,16 +27,16 @@ struct avtab_key {
u16 source_type; /* source type */
u16 target_type; /* target type */
u16 target_class; /* target object class */
-#define AVTAB_ALLOWED 1
-#define AVTAB_AUDITALLOW 2
-#define AVTAB_AUDITDENY 4
-#define AVTAB_AV (AVTAB_ALLOWED | AVTAB_AUDITALLOW | AVTAB_AUDITDENY)
-#define AVTAB_TRANSITION 16
-#define AVTAB_MEMBER 32
-#define AVTAB_CHANGE 64
-#define AVTAB_TYPE (AVTAB_TRANSITION | AVTAB_MEMBER | AVTAB_CHANGE)
-#define AVTAB_ENABLED_OLD 0x80000000 /* reserved for used in cond_avtab */
-#define AVTAB_ENABLED 0x8000 /* reserved for used in cond_avtab */
+#define AVTAB_ALLOWED 0x0001
+#define AVTAB_AUDITALLOW 0x0002
+#define AVTAB_AUDITDENY 0x0004
+#define AVTAB_AV (AVTAB_ALLOWED | AVTAB_AUDITALLOW | AVTAB_AUDITDENY)
+#define AVTAB_TRANSITION 0x0010
+#define AVTAB_MEMBER 0x0020
+#define AVTAB_CHANGE 0x0040
+#define AVTAB_TYPE (AVTAB_TRANSITION | AVTAB_MEMBER | AVTAB_CHANGE)
+#define AVTAB_ENABLED_OLD 0x80000000 /* reserved for used in cond_avtab */
+#define AVTAB_ENABLED 0x8000 /* reserved for used in cond_avtab */
u16 specified; /* what field is specified */
};
diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c
index be9de387283..159c8180676 100644
--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -123,6 +123,11 @@ static struct policydb_compat_info policydb_compat[] = {
.sym_num = SYM_NUM,
.ocon_num = OCON_NUM,
},
+ {
+ .version = POLICYDB_VERSION_FILENAME_TRANS,
+ .sym_num = SYM_NUM,
+ .ocon_num = OCON_NUM,
+ },
};
static struct policydb_compat_info *policydb_lookup_compat(int version)
@@ -704,6 +709,7 @@ void policydb_destroy(struct policydb *p)
int i;
struct role_allow *ra, *lra = NULL;
struct role_trans *tr, *ltr = NULL;
+ struct filename_trans *ft, *nft;
for (i = 0; i < SYM_NUM; i++) {
cond_resched();
@@ -781,6 +787,15 @@ void policydb_destroy(struct policydb *p)
}
flex_array_free(p->type_attr_map_array);
}
+
+ ft = p->filename_trans;
+ while (ft) {
+ nft = ft->next;
+ kfree(ft->name);
+ kfree(ft);
+ ft = nft;
+ }
+
ebitmap_destroy(&p->policycaps);
ebitmap_destroy(&p->permissive_map);
@@ -1788,6 +1803,76 @@ out:
return rc;
}
+static int filename_trans_read(struct policydb *p, void *fp)
+{
+ struct filename_trans *ft, *last;
+ u32 nel, len;
+ char *name;
+ __le32 buf[4];
+ int rc, i;
+
+ if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
+ return 0;
+
+ rc = next_entry(buf, fp, sizeof(u32));
+ if (rc)
+ goto out;
+ nel = le32_to_cpu(buf[0]);
+
+ printk(KERN_ERR "%s: nel=%d\n", __func__, nel);
+
+ last = p->filename_trans;
+ while (last && last->next)
+ last = last->next;
+
+ for (i = 0; i < nel; i++) {
+ rc = -ENOMEM;
+ ft = kzalloc(sizeof(*ft), GFP_KERNEL);
+ if (!ft)
+ goto out;
+
+ /* add it to the tail of the list */
+ if (!last)
+ p->filename_trans = ft;
+ else
+ last->next = ft;
+ last = ft;
+
+ /* length of the path component string */
+ rc = next_entry(buf, fp, sizeof(u32));
+ if (rc)
+ goto out;
+ len = le32_to_cpu(buf[0]);
+
+ rc = -ENOMEM;
+ name = kmalloc(len + 1, GFP_KERNEL);
+ if (!name)
+ goto out;
+
+ ft->name = name;
+
+ /* path component string */
+ rc = next_entry(name, fp, len);
+ if (rc)
+ goto out;
+ name[len] = 0;
+
+ printk(KERN_ERR "%s: ft=%p ft->name=%p ft->name=%s\n", __func__, ft, ft->name, ft->name);
+
+ rc = next_entry(buf, fp, sizeof(u32) * 4);
+ if (rc)
+ goto out;
+
+ ft->stype = le32_to_cpu(buf[0]);
+ ft->ttype = le32_to_cpu(buf[1]);
+ ft->tclass = le32_to_cpu(buf[2]);
+ ft->otype = le32_to_cpu(buf[3]);
+ }
+ rc = 0;
+out:
+ return rc;
+}
+
static int genfs_read(struct policydb *p, void *fp)
{
int i, j, rc;
@@ -2251,6 +2336,10 @@ int policydb_read(struct policydb *p, void *fp)
lra = ra;
}
+ rc = filename_trans_read(p, fp);
+ if (rc)
+ goto bad;
+
rc = policydb_index(p);
if (rc)
goto bad;
@@ -3025,6 +3114,43 @@ static int range_write(struct policydb *p, void *fp)
return 0;
}
+static int filename_trans_write(struct policydb *p, void *fp)
+{
+ struct filename_trans *ft;
+ u32 len, nel = 0;
+ __le32 buf[4];
+ int rc;
+
+ for (ft = p->filename_trans; ft; ft = ft->next)
+ nel++;
+
+ buf[0] = cpu_to_le32(nel);
+ rc = put_entry(buf, sizeof(u32), 1, fp);
+ if (rc)
+ return rc;
+
+ for (ft = p->filename_trans; ft; ft = ft->next) {
+ len = strlen(ft->name);
+ buf[0] = cpu_to_le32(len);
+ rc = put_entry(buf, sizeof(u32), 1, fp);
+ if (rc)
+ return rc;
+
+ rc = put_entry(ft->name, sizeof(char), len, fp);
+ if (rc)
+ return rc;
+
+ buf[0] = ft->stype;
+ buf[1] = ft->ttype;
+ buf[2] = ft->tclass;
+ buf[3] = ft->otype;
+
+ rc = put_entry(buf, sizeof(u32), 4, fp);
+ if (rc)
+ return rc;
+ }
+ return 0;
+}
/*
* Write the configuration data in a policy database
* structure to a policy database binary representation
@@ -3135,6 +3261,10 @@ int policydb_write(struct policydb *p, void *fp)
if (rc)
return rc;
+ rc = filename_trans_write(p, fp);
+ if (rc)
+ return rc;
+
rc = ocontext_write(p, info, fp);
if (rc)
return rc;
diff --git a/security/selinux/ss/policydb.h b/security/selinux/ss/policydb.h
index 4e3ab9d0b31..732ea4a6868 100644
--- a/security/selinux/ss/policydb.h
+++ b/security/selinux/ss/policydb.h
@@ -77,6 +77,15 @@ struct role_trans {
struct role_trans *next;
};
+struct filename_trans {
+ struct filename_trans *next;
+ u32 stype; /* current process */
+ u32 ttype; /* parent dir context */
+ u16 tclass; /* class of new object */
+ const char *name; /* last path component */
+ u32 otype; /* expected of new object */
+};
+
struct role_allow {
u32 role; /* current role */
u32 new_role; /* new role */
@@ -217,6 +226,9 @@ struct policydb {
/* role transitions */
struct role_trans *role_tr;
+ /* file transitions with the last path component */
+ struct filename_trans *filename_trans;
+
/* bools indexed by (value - 1) */
struct cond_bool_datum **bool_val_to_struct;
/* type enforcement conditional access vectors and transitions */
@@ -302,7 +314,7 @@ static inline int next_entry(void *buf, struct policy_file *fp, size_t bytes)
return 0;
}
-static inline int put_entry(void *buf, size_t bytes, int num, struct policy_file *fp)
+static inline int put_entry(const void *buf, size_t bytes, int num, struct policy_file *fp)
{
size_t len = bytes * num;
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index a03cfaf0ee0..2e36e03c21f 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -1343,10 +1343,27 @@ out:
return -EACCES;
}
+static void filename_compute_type(struct policydb *p, struct context *newcontext,
+ u32 scon, u32 tcon, u16 tclass,
+ const struct qstr *qstr)
+{
+ struct filename_trans *ft;
+ for (ft = p->filename_trans; ft; ft = ft->next) {
+ if (ft->stype == scon &&
+ ft->ttype == tcon &&
+ ft->tclass == tclass &&
+ !strcmp(ft->name, qstr->name)) {
+ newcontext->type = ft->otype;
+ return;
+ }
+ }
+}
+
static int security_compute_sid(u32 ssid,
u32 tsid,
u16 orig_tclass,
u32 specified,
+ const struct qstr *qstr,
u32 *out_sid,
bool kern)
{
@@ -1442,6 +1459,11 @@ static int security_compute_sid(u32 ssid,
newcontext.type = avdatum->data;
}
+ /* if we have a qstr this is a file trans check so check those rules */
+ if (qstr)
+ filename_compute_type(&policydb, &newcontext, scontext->type,
+ tcontext->type, tclass, qstr);
+
/* Check for class-specific changes. */
if (tclass == policydb.process_class) {
if (specified & AVTAB_TRANSITION) {
@@ -1495,22 +1517,17 @@ out:
* if insufficient memory is available, or %0 if the new SID was
* computed successfully.
*/
-int security_transition_sid(u32 ssid,
- u32 tsid,
- u16 tclass,
- u32 *out_sid)
+int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
+ const struct qstr *qstr, u32 *out_sid)
{
return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION,
- out_sid, true);
+ qstr, out_sid, true);
}
-int security_transition_sid_user(u32 ssid,
- u32 tsid,
- u16 tclass,
- u32 *out_sid)
+int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid)
{
return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION,
- out_sid, false);
+ NULL, out_sid, false);
}
/**
@@ -1531,8 +1548,8 @@ int security_member_sid(u32 ssid,
u16 tclass,
u32 *out_sid)
{
- return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid,
- false);
+ return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, NULL,
+ out_sid, false);
}
/**
@@ -1553,8 +1570,8 @@ int security_change_sid(u32 ssid,
u16 tclass,
u32 *out_sid)
{
- return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid,
- false);
+ return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, NULL,
+ out_sid, false);
}
/* Clone the SID into the new SID table. */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-18 01:02:20 +0000