[PATCH] Rework of IPC auditing

1) The audit_ipc_perms() function has been split into two different
functions:
        - audit_ipc_obj()
        - audit_ipc_set_perm()

There's a key shift here...  The audit_ipc_obj() collects the uid, gid,
mode, and SElinux context label of the current ipc object.  This
audit_ipc_obj() hook is now found in several places.  Most notably, it
is hooked in ipcperms(), which is called in various places around the
ipc code permforming a MAC check.  Additionally there are several places
where *checkid() is used to validate that an operation is being
performed on a valid object while not necessarily having a nearby
ipcperms() call.  In these locations, audit_ipc_obj() is called to
ensure that the information is captured by the audit system.

The audit_set_new_perm() function is called any time the permissions on
the ipc object changes.  In this case, the NEW permissions are recorded
(and note that an audit_ipc_obj() call exists just a few lines before
each instance).

2) Support for an AUDIT_IPC_SET_PERM audit message type.  This allows
for separate auxiliary audit records for normal operations on an IPC
object and permissions changes.  Note that the same struct
audit_aux_data_ipcctl is used and populated, however there are separate
audit_log_format statements based on the type of the message.  Finally,
the AUDIT_IPC block of code in audit_free_aux() was extended to handle
aux messages of this new type.  No more mem leaks I hope ;-)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

6 files changed, 98 insertions, 11 deletions

diff --git a/include/linux/audit.h b/include/linux/audit.h
index d5c40823e166..b74c148f14e3 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -83,6 +83,7 @@
 #define AUDIT_CONFIG_CHANGE     1305    /* Audit system configuration change */
 #define AUDIT_SOCKADDR          1306    /* sockaddr copied as syscall arg */
 #define AUDIT_CWD               1307    /* Current working directory */
+#define AUDIT_IPC_SET_PERM      1311    /* IPC new permissions record type */
 
 #define AUDIT_AVC               1400    /* SE Linux avc denial or grant */
 #define AUDIT_SELINUX_ERR       1401    /* Internal SE Linux Errors */
@@ -319,7 +320,8 @@ extern void auditsc_get_stamp(struct audit_context *ctx,
                               struct timespec *t, unsigned int *serial);
 extern int  audit_set_loginuid(struct task_struct *task, uid_t loginuid);
 extern uid_t audit_get_loginuid(struct audit_context *ctx);
-extern int audit_ipc_perms(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode, struct kern_ipc_perm *ipcp);
+extern int audit_ipc_obj(struct kern_ipc_perm *ipcp);
+extern int audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode, struct kern_ipc_perm *ipcp);
 extern int audit_socketcall(int nargs, unsigned long *args);
 extern int audit_sockaddr(int len, void *addr);
 extern int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt);
@@ -338,7 +340,8 @@ extern int audit_set_macxattr(const char *name);
 #define audit_inode_child(d,i,p) do { ; } while (0)
 #define auditsc_get_stamp(c,t,s) do { BUG(); } while (0)
 #define audit_get_loginuid(c) ({ -1; })
-#define audit_ipc_perms(q,u,g,m,i) ({ 0; })
+#define audit_ipc_obj(i) ({ 0; })
+#define audit_ipc_set_perm(q,u,g,m,i) ({ 0; })
 #define audit_socketcall(n,a) ({ 0; })
 #define audit_sockaddr(len, addr) ({ 0; })
 #define audit_avc_path(dentry, mnt) ({ 0; })
diff --git a/ipc/msg.c b/ipc/msg.c
index 48a7f17a7236..7d1340ccb16b 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -13,6 +13,9 @@
  * mostly rewritten, threaded and wake-one semantics added
  * MSGMAX limit removed, sysctl's added
  * (c) 1999 Manfred Spraul <manfred@colorfullife.com>
+ *
+ * support for audit of ipc object properties and permission changes
+ * Dustin Kirkland <dustin.kirkland@us.ibm.com>
  */
 
 #include <linux/capability.h>
@@ -447,6 +450,11 @@ asmlinkage long sys_msgctl (int msqid, int cmd, struct msqid_ds __user *buf)
         if (msg_checkid(msq,msqid))
                 goto out_unlock_up;
         ipcp = &msq->q_perm;
+
+        err = audit_ipc_obj(ipcp);
+        if (err)
+                goto out_unlock_up;
+
         err = -EPERM;
         if (current->euid != ipcp->cuid && 
             current->euid != ipcp->uid && !capable(CAP_SYS_ADMIN))
@@ -460,7 +468,8 @@ asmlinkage long sys_msgctl (int msqid, int cmd, struct msqid_ds __user *buf)
         switch (cmd) {
         case IPC_SET:
         {
-                if ((err = audit_ipc_perms(setbuf.qbytes, setbuf.uid, setbuf.gid, setbuf.mode, ipcp)))
+                err = audit_ipc_set_perm(setbuf.qbytes, setbuf.uid, setbuf.gid, setbuf.mode, ipcp);
+                if (err)
                         goto out_unlock_up;
 
                 err = -EPERM;
diff --git a/ipc/sem.c b/ipc/sem.c
index 642659cd596b..7919f8ece6ba 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -61,6 +61,9 @@
  * (c) 2001 Red Hat Inc <alan@redhat.com>
  * Lockless wakeup
  * (c) 2003 Manfred Spraul <manfred@colorfullife.com>
+ *
+ * support for audit of ipc object properties and permission changes
+ * Dustin Kirkland <dustin.kirkland@us.ibm.com>
  */
 
 #include <linux/config.h>
@@ -820,6 +823,11 @@ static int semctl_down(int semid, int semnum, int cmd, int version, union semun
                 goto out_unlock;
         }       
         ipcp = &sma->sem_perm;
+
+        err = audit_ipc_obj(ipcp);
+        if (err)
+                goto out_unlock;
+
         if (current->euid != ipcp->cuid && 
             current->euid != ipcp->uid && !capable(CAP_SYS_ADMIN)) {
                 err=-EPERM;
@@ -836,7 +844,8 @@ static int semctl_down(int semid, int semnum, int cmd, int version, union semun
                 err = 0;
                 break;
         case IPC_SET:
-                if ((err = audit_ipc_perms(0, setbuf.uid, setbuf.gid, setbuf.mode, ipcp)))
+                err = audit_ipc_set_perm(0, setbuf.uid, setbuf.gid, setbuf.mode, ipcp);
+                if (err)
                         goto out_unlock;
                 ipcp->uid = setbuf.uid;
                 ipcp->gid = setbuf.gid;
diff --git a/ipc/shm.c b/ipc/shm.c
index 1c2faf62bc73..809896851902 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -13,6 +13,8 @@
  * Shared /dev/zero support, Kanoj Sarcar <kanoj@sgi.com>
  * Move the mm functionality over to mm/shmem.c, Christoph Rohland <cr@sap.com>
  *
+ * support for audit of ipc object properties and permission changes
+ * Dustin Kirkland <dustin.kirkland@us.ibm.com>
  */
 
 #include <linux/config.h>
@@ -542,6 +544,10 @@ asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf)
                 if(err)
                         goto out_unlock;
 
+                err = audit_ipc_obj(&(shp->shm_perm));
+                if (err)
+                        goto out_unlock;
+
                 if (!capable(CAP_IPC_LOCK)) {
                         err = -EPERM;
                         if (current->euid != shp->shm_perm.uid &&
@@ -594,6 +600,10 @@ asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf)
                 if(err)
                         goto out_unlock_up;
 
+                err = audit_ipc_obj(&(shp->shm_perm));
+                if (err)
+                        goto out_unlock_up;
+
                 if (current->euid != shp->shm_perm.uid &&
                     current->euid != shp->shm_perm.cuid && 
                     !capable(CAP_SYS_ADMIN)) {
@@ -627,12 +637,15 @@ asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf)
                 err=-EINVAL;
                 if(shp==NULL)
                         goto out_up;
-                if ((err = audit_ipc_perms(0, setbuf.uid, setbuf.gid,
-                                        setbuf.mode, &(shp->shm_perm))))
-                        goto out_unlock_up;
                 err = shm_checkid(shp,shmid);
                 if(err)
                         goto out_unlock_up;
+                err = audit_ipc_obj(&(shp->shm_perm));
+                if (err)
+                        goto out_unlock_up;
+                err = audit_ipc_set_perm(0, setbuf.uid, setbuf.gid, setbuf.mode, &(shp->shm_perm));
+                if (err)
+                        goto out_unlock_up;
                 err=-EPERM;
                 if (current->euid != shp->shm_perm.uid &&
                     current->euid != shp->shm_perm.cuid && 
diff --git a/ipc/util.c b/ipc/util.c
index b3dcfad3b4f7..8193299f45f6 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -10,6 +10,8 @@
  *            Manfred Spraul <manfred@colorfullife.com>
  * Oct 2002 - One lock per IPC id. RCU ipc_free for lock-free grow_ary().
  *            Mingming Cao <cmm@us.ibm.com>
+ * Mar 2006 - support for audit of ipc object properties
+ *            Dustin Kirkland <dustin.kirkland@us.ibm.com>
  */
 
 #include <linux/config.h>
@@ -27,6 +29,7 @@
 #include <linux/workqueue.h>
 #include <linux/seq_file.h>
 #include <linux/proc_fs.h>
+#include <linux/audit.h>
 
 #include <asm/unistd.h>
 
@@ -464,8 +467,10 @@ void ipc_rcu_putref(void *ptr)
  
 int ipcperms (struct kern_ipc_perm *ipcp, short flag)
 {       /* flag will most probably be 0 or S_...UGO from <linux/stat.h> */
-        int requested_mode, granted_mode;
+        int requested_mode, granted_mode, err;
 
+        if (unlikely((err = audit_ipc_obj(ipcp))))
+                return err;
         requested_mode = (flag >> 6) | (flag >> 3) | flag;
         granted_mode = ipcp->mode;
         if (current->euid == ipcp->cuid || current->euid == ipcp->uid)
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index d94e0404113c..a300736ee037 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -646,6 +646,25 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
                         }
                         break; }
 
+                case AUDIT_IPC_SET_PERM: {
+                        struct audit_aux_data_ipcctl *axi = (void *)aux;
+                        audit_log_format(ab,
+                                " new qbytes=%lx new iuid=%u new igid=%u new mode=%x",
+                                axi->qbytes, axi->uid, axi->gid, axi->mode);
+                        if (axi->osid != 0) {
+                                char *ctx = NULL;
+                                u32 len;
+                                if (selinux_ctxid_to_string(
+                                                axi->osid, &ctx, &len)) {
+                                        audit_log_format(ab, " osid=%u",
+                                                        axi->osid);
+                                        call_panic = 1;
+                                } else
+                                        audit_log_format(ab, " obj=%s", ctx);
+                                kfree(ctx);
+                        }
+                        break; }
+
                 case AUDIT_SOCKETCALL: {
                         int i;
                         struct audit_aux_data_socketcall *axs = (void *)aux;
@@ -1148,7 +1167,36 @@ uid_t audit_get_loginuid(struct audit_context *ctx)
 }
 
 /**
- * audit_ipc_perms - record audit data for ipc
+ * audit_ipc_obj - record audit data for ipc object
+ * @ipcp: ipc permissions
+ *
+ * Returns 0 for success or NULL context or < 0 on error.
+ */
+int audit_ipc_obj(struct kern_ipc_perm *ipcp)
+{
+        struct audit_aux_data_ipcctl *ax;
+        struct audit_context *context = current->audit_context;
+
+        if (likely(!context))
+                return 0;
+
+        ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
+        if (!ax)
+                return -ENOMEM;
+
+        ax->uid = ipcp->uid;
+        ax->gid = ipcp->gid;
+        ax->mode = ipcp->mode;
+        selinux_get_ipc_sid(ipcp, &ax->osid);
+
+        ax->d.type = AUDIT_IPC;
+        ax->d.next = context->aux;
+        context->aux = (void *)ax;
+        return 0;
+}
+
+/**
+ * audit_ipc_set_perm - record audit data for new ipc permissions
  * @qbytes: msgq bytes
  * @uid: msgq user id
  * @gid: msgq group id
@@ -1156,7 +1204,7 @@ uid_t audit_get_loginuid(struct audit_context *ctx)
  *
  * Returns 0 for success or NULL context or < 0 on error.
  */
-int audit_ipc_perms(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode, struct kern_ipc_perm *ipcp)
+int audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode, struct kern_ipc_perm *ipcp)
 {
         struct audit_aux_data_ipcctl *ax;
         struct audit_context *context = current->audit_context;
@@ -1174,7 +1222,7 @@ int audit_ipc_perms(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode, str
         ax->mode = mode;
         selinux_get_ipc_sid(ipcp, &ax->osid);
 
-        ax->d.type = AUDIT_IPC;
+        ax->d.type = AUDIT_IPC_SET_PERM;
         ax->d.next = context->aux;
         context->aux = (void *)ax;
         return 0;