Where do I get the pieces?
by Charles Woodward
Where can I get the RHEL4 2.6.9 kernel, the SNARE kernel patch, and the SNARE binary?
Can you send me a link to each?
I assume all of these pieces must match.
Charles
-----Original Message-----
From: linux-audit-bounces(a)redhat.com on behalf of David Woodhouse
Sent: Thu 4/21/2005 8:18 PM
To: Linux Audit Discussion
Cc:
Subject: Re: Kernel patching question
On Wed, 2005-04-20 at 15:54 -0400, Charles Woodward wrote:
> Must the kernel-2.6.7-1.494.2.2SNARE096b.i686 be placed on a Fedora
> Core 2 version 2.6.7 OS only?
I know nothing of the 2.6.7 kernel of which you speak. The kernels we're
currently testing are 2.6.9-based kernels from RHEL4.
--
dwmw2
--
Linux-audit mailing list
Linux-audit(a)redhat.com
http://www.redhat.com/mailman/listinfo/linux-audit
19 years, 8 months
Kernel patching question
by Charles Woodward
Must the kernel-2.6.7-1.494.2.2SNARE096b.i686 be placed on a Fedora Core 2 version 2.6.7 OS only?
19 years, 8 months
audit-0.6.12 released
by Steve Grubb
Hello,
I've just released a new version of the audit daemon. It can be downloaded
from http://people.redhat.com/sgrubb/audit The Changelog is:
- Fixed bug where elf type wasn't being set when given numerically
- Added autrace program (similar to strace)
- Fixed bug when logs = 2 and ROTATE is the action, only 1 log resulted
This release features a new program autrace. It works similar to strace. You
give it a program to execute with parameters and it: clears the audit rules,
generates a rule to audit all syscalls for that program, and executes the
program. When the program ends, it clears the rules.
-Steve
19 years, 8 months
[PATCH] very important fix for RH auditfs.7 patch
by Timothy R. Chavez
So this is just a fix to the already patched kernel. I'll come up with a new
patch against the entire RH 2.6.9 tree momentarily. When patching by hand I
forgot to include the function that initializes the auditfs caches.
--- audit.c~orig 2005-04-20 14:52:30.000000000 +0000
+++ audit.c 2005-04-20 14:52:16.000000000 +0000
@@ -574,6 +574,7 @@ int __init audit_init(void)
audit_initialized = 1;
audit_enabled = audit_default;
+ audit_filesystem_init();
audit_log(NULL, "initialized");
return 0;
}
-tim
19 years, 8 months
audit.22 kernel.
by David Woodhouse
Has the AVC part of Stephen's audit_log_task_info() patch, because AIUI
that's what we need to avoid the dcache_lock deadlock.
Has auditfs patch #7, and a version of jamesm's patch which Steve
forwarded this morning.
It's uploading _very_ slowly, but will hopefully be there in a few
hours.
--
dwmw2
19 years, 8 months
audit 0.6.11 released
by Steve Grubb
Hello,
I've just released a new version of the audit daemon. It can be downloaded
from http://people.redhat.com/sgrubb/audit The Changelog is:
- Check log file size on start up
- Added priority_boost config item
- Reworked arch support
- Reworked how run level is changed
- Make allowances for ECONNREFUSED.
The program was not checking the logfile size on startup which could make it
add a record before deciding to perform the log file size action.
In order to help solve the lost records problem, I've added a priority boost
option to auditd.conf. The default is 3. you should probably check
you /etc/auditd.conf file to see that you have the new option.
The arch support has been reworked. Thanks to Debbie Velarde for helping
gather the syscall tables. Please give this feature a try. I think it should
be working (except for "both"). Please report any bugs with this soon and
I'll release a 0.6.12 to fix any problems.
The way that the run level is changed was reworked to make SE Linux policy
better. It was invoking system() now it does execve().
People that are rolling their own kernels and not including the audit system
were being stopped from logging by pam. I made an exception that if
ECONNREFUSED is detected during sendto, they are using a modified kernel and
we'll bypass logging. ECONNREFUSED means the kernel isn't listening on the
audit netlink socket....so I think this exception is safe.
Please give it some testing and report any problems.
-Steve
19 years, 8 months
[RFC][PATCH 1/3] (#7) updated file system auditing patches
by Timothy R. Chavez
Ok,
So I got some time and diffed some new patches. This is a second attempt
since the first one stalled due to size and hasn't been taken care of by the
administrator.
[PATCH 1/3]
Bottom of this message. Patch against the SRPM for audit.20 (which is a
replacement for linux-2.6.9-auditfs-1.patch & linux-2.6.9-auditfs-2.patch)
[PATCH 2/3]
Patch against linux-2.6.12-rc2-mm1.
[PATCH 3/3]
User space patch against audit-0.6.10.
CHANGES/UPDATES:
There was a new structure added called "audit_transport" which is used to
transport audit_watch data to and from the kernel. The audit_watch struct is
now separate for kernel and user. Respective handling for this structure was
added to the user space auditctl tool and kernel.
A new listing feature was added which builds on the existing listing feature
for rules per Mr. Grubb's suggestions. To do this, a "master watchlist" was
added with its own lock (which is possibly unnecessary) and the audit_wentry
field was outfitted with another hlist_node for this list. When a list is
requested, watches will be sent back to user space with the path that was
used to add them, the device they were added on, and whether or not they are
reachable from the current namespace / file system. Whenever we add / remove
a watch, the list is requested.
A bug was discovered by Loulwa that allowed one to add a watch to a file,
hardlink to it, access the hardlink first, and subvert the audit subsystem.
This was due to the strategy of lazy updates of the "watched" file system
object (Which I think Stephen even pointed out before). So now updates are
done ASAP on watch inserts.
-tim
diff -Nurp linux-2.6.12-rc2-mm1~orig/fs/dcache.c linux-2.6.12-rc2-mm1~audit/fs/dcache.c
--- linux-2.6.12-rc2-mm1~orig/fs/dcache.c 2005-04-11 14:14:36.000000000 +0000
+++ linux-2.6.12-rc2-mm1~audit/fs/dcache.c 2005-04-05 18:16:04.000000000 +0000
@@ -32,6 +32,7 @@
#include <linux/seqlock.h>
#include <linux/swap.h>
#include <linux/bootmem.h>
+#include <linux/audit.h>
/* #define DCACHE_DEBUG 1 */
@@ -97,6 +98,7 @@ static inline void dentry_iput(struct de
{
struct inode *inode = dentry->d_inode;
if (inode) {
+ audit_attach_watch(dentry, 1);
dentry->d_inode = NULL;
list_del_init(&dentry->d_alias);
spin_unlock(&dentry->d_lock);
@@ -802,6 +804,7 @@ void d_instantiate(struct dentry *entry,
if (inode)
list_add(&entry->d_alias, &inode->i_dentry);
entry->d_inode = inode;
+ audit_attach_watch(entry, 0);
spin_unlock(&dcache_lock);
security_d_instantiate(entry, inode);
}
@@ -978,6 +981,7 @@ struct dentry *d_splice_alias(struct ino
new = __d_find_alias(inode, 1);
if (new) {
BUG_ON(!(new->d_flags & DCACHE_DISCONNECTED));
+ audit_attach_watch(new, 0);
spin_unlock(&dcache_lock);
security_d_instantiate(new, inode);
d_rehash(dentry);
@@ -987,6 +991,7 @@ struct dentry *d_splice_alias(struct ino
/* d_instantiate takes dcache_lock, so we do it by hand */
list_add(&dentry->d_alias, &inode->i_dentry);
dentry->d_inode = inode;
+ audit_attach_watch(dentry, 0);
spin_unlock(&dcache_lock);
security_d_instantiate(dentry, inode);
d_rehash(dentry);
@@ -1090,6 +1095,7 @@ struct dentry * __d_lookup(struct dentry
if (!d_unhashed(dentry)) {
atomic_inc(&dentry->d_count);
found = dentry;
+ audit_attach_watch(found, 0);
}
spin_unlock(&dentry->d_lock);
break;
@@ -1299,6 +1305,8 @@ void d_move(struct dentry * dentry, stru
spin_lock(&target->d_lock);
}
+ audit_attach_watch(dentry, 1);
+
/* Move the dentry to the target hash queue, if on different bucket */
if (dentry->d_flags & DCACHE_UNHASHED)
goto already_unhashed;
@@ -1332,6 +1340,7 @@ already_unhashed:
list_add(&target->d_child, &target->d_parent->d_subdirs);
}
+ audit_attach_watch(dentry, 0);
list_add(&dentry->d_child, &dentry->d_parent->d_subdirs);
spin_unlock(&target->d_lock);
spin_unlock(&dentry->d_lock);
diff -Nurp linux-2.6.12-rc2-mm1~orig/fs/inode.c linux-2.6.12-rc2-mm1~audit/fs/inode.c
--- linux-2.6.12-rc2-mm1~orig/fs/inode.c 2005-04-11 14:14:37.000000000 +0000
+++ linux-2.6.12-rc2-mm1~audit/fs/inode.c 2005-04-05 18:16:04.000000000 +0000
@@ -22,6 +22,7 @@
#include <linux/cdev.h>
#include <linux/bootmem.h>
#include <linux/inotify.h>
+#include <linux/audit.h>
/*
* This is needed for the following functions:
@@ -140,9 +141,11 @@ static struct inode *alloc_inode(struct
inode->i_bdev = NULL;
inode->i_cdev = NULL;
inode->i_rdev = 0;
+ inode->i_audit = NULL;
inode->i_security = NULL;
inode->dirtied_when = 0;
- if (security_inode_alloc(inode)) {
+ if (audit_inode_alloc(inode) || security_inode_alloc(inode)) {
+ audit_inode_free(inode);
if (inode->i_sb->s_op->destroy_inode)
inode->i_sb->s_op->destroy_inode(inode);
else
@@ -180,6 +183,7 @@ void destroy_inode(struct inode *inode)
{
if (inode_has_buffers(inode))
BUG();
+ audit_inode_free(inode);
security_inode_free(inode);
if (inode->i_sb->s_op->destroy_inode)
inode->i_sb->s_op->destroy_inode(inode);
diff -Nurp linux-2.6.12-rc2-mm1~orig/fs/namei.c linux-2.6.12-rc2-mm1~audit/fs/namei.c
--- linux-2.6.12-rc2-mm1~orig/fs/namei.c 2005-04-11 14:14:36.000000000 +0000
+++ linux-2.6.12-rc2-mm1~audit/fs/namei.c 2005-04-05 18:16:04.000000000 +0000
@@ -225,6 +225,8 @@ int permission(struct inode *inode, int
{
int retval, submask;
+ audit_notify_watch(inode, mask);
+
if (mask & MAY_WRITE) {
umode_t mode = inode->i_mode;
@@ -358,6 +360,8 @@ static inline int exec_permission_lite(s
if (inode->i_op && inode->i_op->permission)
return -EAGAIN;
+ audit_notify_watch(inode, MAY_EXEC);
+
if (current->fsuid == inode->i_uid)
mode >>= 6;
else if (in_group_p(inode->i_gid))
@@ -1172,6 +1176,8 @@ static inline int may_delete(struct inod
BUG_ON(victim->d_parent->d_inode != dir);
+ audit_notify_watch(victim->d_inode, MAY_WRITE);
+
error = permission(dir,MAY_WRITE | MAY_EXEC, NULL);
if (error)
return error;
@@ -1296,6 +1302,7 @@ int vfs_create(struct inode *dir, struct
DQUOT_INIT(dir);
error = dir->i_op->create(dir, dentry, mode, nd);
if (!error) {
+ audit_notify_watch(dentry->d_inode, MAY_WRITE);
fsnotify_create(dir, dentry->d_name.name);
security_inode_post_create(dir, dentry, mode);
}
@@ -1601,6 +1608,7 @@ int vfs_mknod(struct inode *dir, struct
DQUOT_INIT(dir);
error = dir->i_op->mknod(dir, dentry, mode, dev);
if (!error) {
+ audit_notify_watch(dentry->d_inode, MAY_WRITE);
fsnotify_create(dir, dentry->d_name.name);
security_inode_post_mknod(dir, dentry, mode, dev);
}
@@ -1674,6 +1682,7 @@ int vfs_mkdir(struct inode *dir, struct
DQUOT_INIT(dir);
error = dir->i_op->mkdir(dir, dentry, mode);
if (!error) {
+ audit_notify_watch(dentry->d_inode, MAY_WRITE);
fsnotify_mkdir(dir, dentry->d_name.name);
security_inode_post_mkdir(dir,dentry, mode);
}
@@ -1915,6 +1924,7 @@ int vfs_symlink(struct inode *dir, struc
DQUOT_INIT(dir);
error = dir->i_op->symlink(dir, dentry, oldname);
if (!error) {
+ audit_notify_watch(dentry->d_inode, MAY_WRITE);
fsnotify_create(dir, dentry->d_name.name);
security_inode_post_symlink(dir, dentry, oldname);
}
@@ -1988,6 +1998,7 @@ int vfs_link(struct dentry *old_dentry,
error = dir->i_op->link(old_dentry, dir, new_dentry);
up(&old_dentry->d_inode->i_sem);
if (!error) {
+ audit_notify_watch(new_dentry->d_inode, MAY_WRITE);
fsnotify_create(dir, new_dentry->d_name.name);
security_inode_post_link(old_dentry, dir, new_dentry);
}
@@ -2111,6 +2122,7 @@ int vfs_rename_dir(struct inode *old_dir
}
if (!error) {
d_move(old_dentry,new_dentry);
+ audit_notify_watch(old_dentry->d_inode, MAY_WRITE);
security_inode_post_rename(old_dir, old_dentry,
new_dir, new_dentry);
}
@@ -2139,6 +2151,7 @@ int vfs_rename_other(struct inode *old_d
/* The following d_move() should become unconditional */
if (!(old_dir->i_sb->s_type->fs_flags & FS_ODD_RENAME))
d_move(old_dentry, new_dentry);
+ audit_notify_watch(old_dentry->d_inode, MAY_WRITE);
security_inode_post_rename(old_dir, old_dentry, new_dir, new_dentry);
}
if (target)
diff -Nurp linux-2.6.12-rc2-mm1~orig/include/linux/audit.h linux-2.6.12-rc2-mm1~audit/include/linux/audit.h
--- linux-2.6.12-rc2-mm1~orig/include/linux/audit.h 2005-04-11 14:15:03.000000000 +0000
+++ linux-2.6.12-rc2-mm1~audit/include/linux/audit.h 2005-04-11 14:16:25.000000000 +0000
@@ -24,18 +24,27 @@
#ifndef _LINUX_AUDIT_H_
#define _LINUX_AUDIT_H_
+#ifdef __KERNEL__
#include <linux/sched.h>
#include <linux/elf.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <asm/atomic.h>
+#endif
+
/* Request and reply types */
-#define AUDIT_GET 1000 /* Get status */
-#define AUDIT_SET 1001 /* Set status (enable/disable/auditd) */
-#define AUDIT_LIST 1002 /* List filtering rules */
-#define AUDIT_ADD 1003 /* Add filtering rule */
-#define AUDIT_DEL 1004 /* Delete filtering rule */
-#define AUDIT_USER 1005 /* Send a message from user-space */
-#define AUDIT_LOGIN 1006 /* Define the login id and informaiton */
-#define AUDIT_KERNEL 2000 /* Asynchronous audit record. NOT A REQUEST. */
+#define AUDIT_GET 1000 /* Get status */
+#define AUDIT_SET 1001 /* Set status (enable/disable/auditd) */
+#define AUDIT_LIST 1002 /* List filtering rules */
+#define AUDIT_ADD 1003 /* Add filtering rule */
+#define AUDIT_DEL 1004 /* Delete filtering rule */
+#define AUDIT_USER 1005 /* Send a message from user-space */
+#define AUDIT_LOGIN 1006 /* Define the login id and informaiton */
+#define AUDIT_WATCH_INS 1007 /* Insert file/dir watch entry */
+#define AUDIT_WATCH_REM 1008 /* Remove file/dir watch entry */
+#define AUDIT_WATCH_LIST 1009 /* List all watches */
+#define AUDIT_KERNEL 2000 /* Asynchronous audit record. NOT A REQUEST. */
/* Rule flags */
#define AUDIT_PER_TASK 0x01 /* Apply rule at task creation (not syscall) */
@@ -132,6 +141,9 @@
#define AUDIT_ARCH_V850 (EM_V850|__AUDIT_ARCH_LE)
#define AUDIT_ARCH_X86_64 (EM_X86_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
+/* 32 byte max key size */
+#define AUDIT_FILTERKEY_MAX 32
+
#ifndef __KERNEL__
struct audit_message {
struct nlmsghdr nlh;
@@ -159,8 +171,41 @@ struct audit_rule { /* for AUDIT_LIST,
__u32 values[AUDIT_MAX_FIELDS];
};
+/* Structure to transport watch data to and from the kernel */
+
+struct audit_transport {
+ __u32 dev;
+ __u32 perms;
+ __u32 valid;
+ __u32 pathlen;
+ __u32 fklen;
+ char buf[0];
+};
+
#ifdef __KERNEL__
+struct audit_data {
+ struct audit_wentry *wentry;
+ struct hlist_head watchlist;
+ rwlock_t lock;
+};
+
+struct audit_watch {
+ dev_t dev; /* Superblock device */
+ __u32 perms; /* Permissions filtering */
+ char *name; /* Watch point beneath parent */
+ char *path; /* Insertion path */
+ char *filterkey; /* An arbitrary filtering key */
+};
+
+struct audit_wentry {
+ struct hlist_node w_node;
+ struct hlist_node w_master;
+ struct audit_watch *w_watch;
+ atomic_t w_count;
+
+};
+
struct audit_buffer;
struct audit_context;
struct inode;
@@ -190,16 +235,40 @@ extern void audit_get_stamp(struct audit
extern int audit_set_loginuid(struct audit_context *ctx, 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);
+extern int audit_notify_watch(struct inode *inode, int mask);
#else
#define audit_alloc(t) ({ 0; })
#define audit_free(t) do { ; } while (0)
#define audit_syscall_entry(t,ta,a,b,c,d,e) do { ; } while (0)
#define audit_syscall_exit(t,f,r) do { ; } while (0)
+#define audit_receive_filter(t,p,u,s,d) ({ -EOPNOTSUPP; })
#define audit_getname(n) do { ; } while (0)
#define audit_putname(n) do { ; } while (0)
#define audit_inode(n,i) do { ; } while (0)
#define audit_get_loginuid(c) ({ -1; })
#define audit_ipc_perms(q,u,g,m) ({ 0; })
+#define audit_notify_watch(i,m) ({ 0; })
+#endif
+
+#ifdef CONFIG_AUDITFILESYSTEM
+extern int audit_list_watches(int pid, int seq);
+extern int audit_receive_watch(int type, int pid, int uid, int seq,
+ struct audit_transport *req);
+extern int audit_filesystem_init(void);
+extern int audit_inode_alloc(struct inode *inode);
+extern void audit_inode_free(struct inode *inode);
+extern void audit_attach_watch(struct dentry *dentry, int remove);
+extern void audit_wentry_put(struct audit_wentry *wentry);
+extern struct audit_wentry *audit_wentry_get(struct audit_wentry *wentry);
+#else
+#define audit_list_watches(p,s) ({ -EOPNOTSUPP; })
+#define audit_receive_watch(t,p,u,s,r) ({ -EOPNOTSUPP; })
+#define audit_filesystem_init() ({ 0; })
+#define audit_inode_alloc(i) ({ 0; })
+#define audit_inode_free(i) do { ; } while(0)
+#define audit_attach_watch(d,r) do { ; } while (0)
+#define audit_wentry_put(w) do { ; } while(0)
+#define audit_wentry_get(w) ({ 0; })
#endif
#ifdef CONFIG_AUDIT
diff -Nurp linux-2.6.12-rc2-mm1~orig/include/linux/fs.h linux-2.6.12-rc2-mm1~audit/include/linux/fs.h
--- linux-2.6.12-rc2-mm1~orig/include/linux/fs.h 2005-04-11 14:15:02.000000000 +0000
+++ linux-2.6.12-rc2-mm1~audit/include/linux/fs.h 2005-04-05 21:11:48.000000000 +0000
@@ -214,6 +214,7 @@ extern int dir_notify_enable;
#include <linux/prio_tree.h>
#include <linux/init.h>
#include <linux/sched.h>
+#include <linux/audit.h>
#include <asm/atomic.h>
#include <asm/semaphore.h>
@@ -477,6 +478,7 @@ struct inode {
struct semaphore inotify_sem; /* protects the watches list */
#endif
+ struct audit_data *i_audit;
unsigned long i_state;
unsigned long dirtied_when; /* jiffies of first dirtying */
diff -Nurp linux-2.6.12-rc2-mm1~orig/init/Kconfig linux-2.6.12-rc2-mm1~audit/init/Kconfig
--- linux-2.6.12-rc2-mm1~orig/init/Kconfig 2005-04-11 14:15:38.000000000 +0000
+++ linux-2.6.12-rc2-mm1~audit/init/Kconfig 2005-04-05 18:16:26.000000000 +0000
@@ -198,6 +198,16 @@ config AUDITSYSCALL
can be used independently or with another kernel subsystem,
such as SELinux.
+config AUDITFILESYSTEM
+ bool "Enable file system auditing support"
+ depends on AUDITSYSCALL
+ default n
+ help
+ Enable file system auditing for regular files and directories.
+ When a targeted file or directory is accessed, an audit record
+ is generated describing the inode accessed, how it was accessed,
+ and by whom (ie: pid and system call).
+
config HOTPLUG
bool "Support for hot-pluggable devices" if !ARCH_S390
default ARCH_S390
diff -Nurp linux-2.6.12-rc2-mm1~orig/kernel/Makefile linux-2.6.12-rc2-mm1~audit/kernel/Makefile
--- linux-2.6.12-rc2-mm1~orig/kernel/Makefile 2005-04-11 14:15:35.000000000 +0000
+++ linux-2.6.12-rc2-mm1~audit/kernel/Makefile 2005-04-05 18:21:20.000000000 +0000
@@ -25,6 +25,7 @@ obj-$(CONFIG_IKCONFIG_PROC) += configs.o
obj-$(CONFIG_STOP_MACHINE) += stop_machine.o
obj-$(CONFIG_AUDIT) += audit.o
obj-$(CONFIG_AUDITSYSCALL) += auditsc.o
+obj-$(CONFIG_AUDITFILESYSTEM) += auditfs.o
obj-$(CONFIG_KPROBES) += kprobes.o
obj-$(CONFIG_SYSFS) += ksysfs.o
obj-$(CONFIG_DETECT_SOFTLOCKUP) += softlockup.o
diff -Nurp linux-2.6.12-rc2-mm1~orig/kernel/audit.c linux-2.6.12-rc2-mm1~audit/kernel/audit.c
--- linux-2.6.12-rc2-mm1~orig/kernel/audit.c 2005-04-11 14:15:36.000000000 +0000
+++ linux-2.6.12-rc2-mm1~audit/kernel/audit.c 2005-04-08 16:12:29.000000000 +0000
@@ -322,6 +322,9 @@ static int audit_netlink_ok(kernel_cap_t
case AUDIT_SET:
case AUDIT_ADD:
case AUDIT_DEL:
+ case AUDIT_WATCH_INS:
+ case AUDIT_WATCH_REM:
+ case AUDIT_WATCH_LIST:
if (!cap_raised(eff_cap, CAP_AUDIT_CONTROL))
err = -EPERM;
break;
@@ -409,12 +412,18 @@ static int audit_receive_msg(struct sk_b
return -EINVAL;
/* fallthrough */
case AUDIT_LIST:
-#ifdef CONFIG_AUDITSYSCALL
err = audit_receive_filter(nlh->nlmsg_type, NETLINK_CB(skb).pid,
uid, seq, data);
-#else
- err = -EOPNOTSUPP;
-#endif
+ case AUDIT_WATCH_LIST:
+ err = audit_list_watches(NETLINK_CB(skb).pid, seq);
+ break;
+ case AUDIT_WATCH_INS:
+ case AUDIT_WATCH_REM:
+ if (nlh->nlmsg_len < sizeof(struct audit_transport))
+ return -EINVAL;
+ err = audit_receive_watch(nlh->nlmsg_type,
+ NETLINK_CB(skb).pid,
+ uid, seq, data);
break;
default:
err = -EINVAL;
@@ -560,6 +569,7 @@ static int __init audit_init(void)
audit_initialized = 1;
audit_enabled = audit_default;
+ audit_filesystem_init();
audit_log(NULL, "initialized");
return 0;
}
diff -Nurp linux-2.6.12-rc2-mm1~orig/kernel/auditfs.c linux-2.6.12-rc2-mm1~audit/kernel/auditfs.c
--- linux-2.6.12-rc2-mm1~orig/kernel/auditfs.c 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.12-rc2-mm1~audit/kernel/auditfs.c 2005-04-12 10:26:35.000000000 +0000
@@ -0,0 +1,560 @@
+/* auditfs.c -- Filesystem auditing support -*- linux-c -*-
+ * Implements filesystem auditing support, depends on kernel/auditsc.c
+ *
+ * Copyright 2005 International Business Machines Corp. (IBM)
+ * All Rights Reserved.
+ *
+ * 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
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307 USA
+ *
+ * Written by Timothy R. Chavez <chavezt(a)us.ibm.com>
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/namei.h>
+#include <linux/mount.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/audit.h>
+#include <asm/uaccess.h>
+
+kmem_cache_t *audit_watch_cache;
+kmem_cache_t *audit_wentry_cache;
+
+spinlock_t audit_master_watchlist_lock;
+HLIST_HEAD(audit_master_watchlist);
+
+
+/* Private Interface */
+
+static inline struct audit_wentry *audit_wentry_fetch(const char *name,
+ struct audit_data *data)
+{
+ struct audit_wentry *wentry, *ret = NULL;
+ struct hlist_node *pos;
+
+ hlist_for_each_entry(wentry, pos, &data->watchlist, w_node)
+ if(!strcmp(wentry->w_watch->name, name)) {
+ ret = audit_wentry_get(wentry);
+ break;
+ }
+
+ return ret;
+}
+
+static inline struct audit_wentry *audit_wentry_fetch_lock(const char *name,
+ struct audit_data *data)
+{
+ struct audit_wentry *ret = NULL;
+
+ if (name && data) {
+ read_lock(&data->lock);
+ ret = audit_wentry_fetch(name, data);
+ read_unlock(&data->lock);
+ }
+
+ return ret;
+}
+
+static inline struct audit_watch *audit_watch_alloc(void)
+{
+ struct audit_watch *watch;
+
+ watch = kmem_cache_alloc(audit_watch_cache, GFP_KERNEL);
+ if (watch) {
+ watch->name = NULL;
+ watch->filterkey = NULL;
+ watch->perms = 0;
+ }
+
+ return watch;
+}
+
+static inline void audit_watch_free(struct audit_watch *watch)
+{
+ if (watch) {
+ kfree(watch->name);
+ kfree(watch->filterkey);
+ kmem_cache_free(audit_watch_cache, watch);
+ }
+}
+
+static inline struct audit_watch *audit_create_watch(const char *path,
+ const char *name,
+ const char *filterkey,
+ __u32 perms, dev_t dev)
+{
+ struct audit_watch *err = NULL;
+ struct audit_watch *watch = NULL;
+
+ err = ERR_PTR(-ENOMEM);
+ watch = audit_watch_alloc();
+ if (watch) {
+ watch->path = kmalloc(strlen(path)+1, GFP_KERNEL);
+ if (!watch->path)
+ goto audit_create_watch_fail;
+ strcpy(watch->path, path);
+ watch->name = kmalloc(strlen(name)+1, GFP_KERNEL);
+ if (!watch->name)
+ goto audit_create_watch_fail;
+ strcpy(watch->name, name);
+
+ if (filterkey) {
+ watch->filterkey = kmalloc(strlen(filterkey)+1,
+ GFP_KERNEL);
+ if (!watch->filterkey)
+ goto audit_create_watch_fail;
+ strcpy(watch->filterkey, filterkey);
+ }
+
+ watch->dev = dev;
+ watch->perms = perms;
+
+ goto audit_create_watch_exit;
+ }
+
+
+audit_create_watch_fail:
+ audit_watch_free(watch);
+ watch = err;
+audit_create_watch_exit:
+ return watch;
+}
+
+static inline struct audit_wentry *audit_wentry_alloc(void)
+{
+ struct audit_wentry *wentry;
+
+ wentry = kmem_cache_alloc(audit_wentry_cache, GFP_KERNEL);
+ if (wentry) {
+ atomic_set(&wentry->w_count, 1);
+ wentry->w_watch = NULL;
+ }
+
+ return wentry;
+}
+
+static inline void audit_wentry_free(struct audit_wentry *wentry)
+{
+ if (wentry) {
+ audit_watch_free(wentry->w_watch);
+ kmem_cache_free(audit_wentry_cache, wentry);
+ }
+}
+
+static inline void audit_master_insert(struct audit_wentry *wentry)
+{
+ wentry = audit_wentry_get(wentry);
+ if (wentry) {
+ spin_lock(&audit_master_watchlist_lock);
+ hlist_add_head(&wentry->w_master, &audit_master_watchlist);
+ spin_unlock(&audit_master_watchlist_lock);
+ }
+}
+
+/*
+ * Remove entry from the master watchlist. To ensure synchronized removal
+ * from both the directory watchlist and master watchlist, watchlist_lock
+ * should first be held so that audit_master_remove cannot be called on
+ * the same wentry.
+ */
+
+static inline void audit_master_remove(struct audit_wentry *wentry)
+{
+ if (wentry) {
+ spin_lock(&audit_master_watchlist_lock);
+ hlist_del_init(&wentry->w_master);
+ audit_wentry_put(wentry);
+ spin_unlock(&audit_master_watchlist_lock);
+ }
+}
+
+
+/* The only time the new wentry gets updated is when it is inaccessible
+ * (out of the list).
+ */
+static inline int audit_create_wentry(const char *path,
+ const char *name,
+ const char *filterkey,
+ __u32 perms, dev_t dev,
+ struct audit_data *data)
+{
+ int ret;
+ struct audit_wentry *wentry = NULL;
+ struct audit_wentry *new = NULL;
+
+ ret = -ENOMEM;
+ new = audit_wentry_alloc();
+ if (!new)
+ goto audit_create_wentry_fail;
+
+ new->w_watch = audit_create_watch(path, name, filterkey, perms, dev);
+ if (IS_ERR(new->w_watch)) {
+ ret = PTR_ERR(new->w_watch);
+ new->w_watch = NULL;
+ goto audit_create_wentry_fail;
+ }
+
+ ret = 0;
+ write_lock(&data->lock);
+ wentry = audit_wentry_fetch(name, data);
+ if (!wentry) {
+ audit_master_insert(new);
+ hlist_add_head(&new->w_node, &data->watchlist);
+ write_unlock(&data->lock);
+ goto audit_create_wentry_exit;
+ }
+ audit_wentry_put(wentry);
+ write_unlock(&data->lock);
+
+ ret = -EEXIST;
+
+audit_create_wentry_fail:
+ audit_wentry_put(new);
+audit_create_wentry_exit:
+ return ret;
+}
+
+/* Caller must hold watchlist_lock */
+
+static inline void audit_destroy_wentry(struct audit_wentry *wentry)
+{
+ if (wentry) {
+ audit_master_remove(wentry);
+ hlist_del_init(&wentry->w_node);
+ audit_wentry_put(wentry);
+ }
+}
+
+
+/* Caller must hold data->lock */
+
+static inline void audit_drain_watchlist(struct audit_data *data)
+{
+ struct audit_wentry *wentry;
+ struct hlist_node *pos, *buf;
+
+ hlist_for_each_entry_safe(wentry, pos, buf, &data->watchlist, w_node)
+ audit_destroy_wentry(wentry);
+}
+
+static inline struct audit_data *audit_data_alloc(void)
+{
+ struct audit_data *data;
+
+ data = kmalloc(sizeof(struct audit_data), GFP_KERNEL);
+ if (data) {
+ data->wentry = NULL;
+ INIT_HLIST_HEAD(&data->watchlist);
+ data->lock = RW_LOCK_UNLOCKED;
+ }
+
+ return data;
+}
+
+static inline void audit_data_free(struct audit_data *data)
+{
+ if (data) {
+ write_lock(&data->lock);
+ audit_drain_watchlist(data);
+ audit_wentry_put(data->wentry);
+ write_unlock(&data->lock);
+ kfree(data);
+ }
+}
+
+static inline int audit_insert_watch(char *path, char *filterkey, __u32 perms)
+{
+ int ret;
+ struct nameidata nd;
+
+ ret = path_lookup(path, LOOKUP_PARENT|LOOKUP_FOLLOW, &nd);
+ if (ret < 0)
+ goto audit_insert_watch_exit;
+
+ ret = -EPERM;
+ if (nd.last_type != LAST_NORM || !nd.last.name)
+ goto audit_insert_watch_release;
+
+ ret = audit_create_wentry(path, nd.last.name, filterkey, perms,
+ nd.dentry->d_inode->i_sb->s_dev,
+ nd.dentry->d_inode->i_audit);
+ /* __d_lookup will attach the audit data, if nd.last.name exists. */
+ d_lookup(nd.dentry, &nd.last);
+
+audit_insert_watch_release:
+ path_release(&nd);
+audit_insert_watch_exit:
+ return ret;
+}
+
+static inline int audit_remove_watch(char *path)
+{
+ int ret;
+ struct nameidata nd;
+ struct audit_data *data;
+ struct audit_wentry *wentry;
+
+ ret = path_lookup(path, LOOKUP_PARENT|LOOKUP_FOLLOW, &nd);
+ if (ret < 0)
+ goto audit_remove_watch_exit;
+
+ ret = -EPERM;
+ if (nd.last_type != LAST_NORM || !nd.last.name)
+ goto audit_remove_watch_release;
+
+ data = nd.dentry->d_inode->i_audit;
+
+ write_lock(&data->lock);
+ wentry = audit_wentry_fetch(nd.last.name, data);
+ if (!wentry) {
+ write_unlock(&data->lock);
+ goto audit_remove_watch_release;
+ }
+ audit_destroy_wentry(wentry);
+ audit_wentry_put(wentry);
+ write_unlock(&data->lock);
+
+ ret = 0;
+
+audit_remove_watch_release:
+ path_release(&nd);
+audit_remove_watch_exit:
+ return ret;
+}
+
+struct audit_wentry *audit_wentry_get(struct audit_wentry *wentry)
+{
+ if (wentry) {
+ BUG_ON(!atomic_read(&wentry->w_count));
+ atomic_inc(&wentry->w_count);
+ }
+
+ return wentry;
+}
+
+void audit_wentry_put(struct audit_wentry *wentry)
+{
+ if (wentry && atomic_dec_and_test(&wentry->w_count))
+ audit_wentry_free(wentry);
+}
+
+/*
+ * Hook appears in fs/dcache.c:
+ * d_move(),
+ * d_delete(),
+ * d_instantiate(),
+ * d_splice_alias()
+ * __d_lookup()
+ */
+void audit_attach_watch(struct dentry *dentry, int remove)
+{
+ struct audit_wentry *wentry;
+ struct audit_data *data, *parent;
+
+ if (!dentry || !dentry->d_inode)
+ return;
+
+ if (!dentry->d_parent || !dentry->d_parent->d_inode)
+ return;
+
+ data = dentry->d_inode->i_audit;
+ parent = dentry->d_parent->d_inode->i_audit;
+
+ wentry = audit_wentry_fetch_lock(dentry->d_name.name, parent);
+
+ write_lock(&data->lock);
+ /* FIXME: long watchlist == too much spinning? */
+ if (remove) {
+ audit_drain_watchlist(data);
+ if (wentry && data->wentry) {
+ if (!strcmp(wentry->w_watch->name,
+ data->wentry->w_watch->name)) {
+ audit_wentry_put(data->wentry);
+ dentry->d_inode->i_audit->wentry = NULL;
+ }
+ }
+ } else if (!data->wentry || hlist_unhashed(&data->wentry->w_node)) {
+ audit_wentry_put(data->wentry);
+ dentry->d_inode->i_audit->wentry = audit_wentry_get(wentry);
+ }
+ audit_wentry_put(wentry);
+ write_unlock(&data->lock);
+}
+
+int audit_send_watch(int pid, int seq, struct audit_watch *watch)
+{
+ int ret;
+ void *memblk;
+ unsigned int offset;
+ unsigned int total;
+ struct audit_data *data;
+ struct audit_wentry *wentry;
+ struct audit_transport req;
+ struct nameidata nd;
+
+ req.valid = 0;
+ req.dev = watch->dev;
+ req.perms = watch->perms;
+ req.pathlen = strlen(watch->path) + 1;
+ req.fklen = strlen(watch->filterkey) + 1;
+
+ ret = -ENOMEM;
+ total = sizeof(req) + req.pathlen + req.fklen;
+ memblk = kmalloc(total, GFP_KERNEL);
+ if (!memblk)
+ goto audit_send_watch_exit;
+
+ /* See if path to watch is valid */
+ ret = path_lookup(watch->path, LOOKUP_PARENT|LOOKUP_FOLLOW, &nd);
+ if (!ret) {
+ data = nd.dentry->d_inode->i_audit;
+ wentry = audit_wentry_fetch_lock(watch->name, data);
+ if (wentry && nd.dentry->d_inode->i_sb->s_dev == watch->dev) {
+ req.valid = 1;
+ audit_wentry_put(wentry);
+ }
+ path_release(&nd);
+ }
+
+ /* Payload */
+ memcpy(memblk, &req, sizeof(req));
+ offset = total - req.fklen;
+ memcpy(memblk + offset, watch->filterkey, req.fklen);
+ offset = offset - req.pathlen;
+ memcpy(memblk + offset, watch->path, req.pathlen);
+
+ audit_send_reply(pid, seq, AUDIT_WATCH_LIST, 0, 1, memblk, total);
+
+ kfree(memblk);
+
+audit_send_watch_exit:
+ return ret;
+}
+
+int audit_list_watches(int pid, int seq)
+{
+ int ret = 0;
+ struct audit_wentry *wentry;
+ struct hlist_node *pos;
+
+ spin_lock(&audit_master_watchlist_lock);
+ hlist_for_each_entry(wentry, pos, &audit_master_watchlist, w_master) {
+ ret = audit_send_watch(pid, seq, wentry->w_watch);
+ if (ret < 0)
+ break;
+ }
+ spin_unlock(&audit_master_watchlist_lock);
+
+ audit_send_reply(pid, seq, AUDIT_WATCH_LIST, 1, 1, NULL, 0);
+
+ return ret;
+}
+
+int audit_receive_watch(int type, int pid, int uid, int seq,
+ struct audit_transport *req)
+{
+ int ret = 0;
+ char *path = NULL;
+ char *filterkey = NULL;
+
+ ret = -ENOMEM;
+ path = kmalloc(req->pathlen, GFP_KERNEL);
+ if (!path)
+ goto audit_receive_watch_exit;
+ strncpy(path, req->buf, req->pathlen);
+
+ if (req->fklen) {
+ filterkey = kmalloc(req->fklen, GFP_KERNEL);
+ if (!filterkey)
+ goto audit_receive_watch_exit;
+ }
+ strncpy(filterkey, req->buf+req->pathlen, req->fklen);
+
+ ret = -EINVAL;
+ if (!path || strlen(path) + 1 > PATH_MAX)
+ goto audit_receive_watch_exit;
+
+ /* Includes terminating '\0' */
+ if (req->fklen > AUDIT_FILTERKEY_MAX)
+ goto audit_receive_watch_exit;
+
+ if (req->perms > (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND))
+ goto audit_receive_watch_exit;
+
+ switch (type) {
+ case AUDIT_WATCH_INS:
+ ret = audit_insert_watch(path, filterkey, req->perms);
+ break;
+ case AUDIT_WATCH_REM:
+ ret = audit_remove_watch(path);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+audit_receive_watch_exit:
+ kfree(path);
+ kfree(filterkey);
+ return ret;
+}
+
+int audit_inode_alloc(struct inode *inode)
+{
+ if (inode) {
+ inode->i_audit = audit_data_alloc();
+ if (!inode->i_audit)
+ return ENOMEM;
+ }
+
+ return 0;
+}
+
+void audit_inode_free(struct inode *inode)
+{
+ if (inode)
+ audit_data_free(inode->i_audit);
+}
+
+int audit_filesystem_init()
+{
+ int ret = 0;
+
+ audit_watch_cache =
+ kmem_cache_create("audit_watch_cache",
+ sizeof(struct audit_watch), 0, 0, NULL, NULL);
+ if (!audit_watch_cache)
+ goto audit_filesystem_init_fail;
+
+ audit_wentry_cache =
+ kmem_cache_create("audit_wentry_cache",
+ sizeof(struct audit_wentry), 0, 0, NULL, NULL);
+ if (!audit_wentry_cache)
+ goto audit_filesystem_init_fail;
+
+ goto audit_filesystem_init_exit;
+
+audit_filesystem_init_fail:
+ ret = -ENOMEM;
+ kmem_cache_destroy(audit_watch_cache);
+ kmem_cache_destroy(audit_wentry_cache);
+audit_filesystem_init_exit:
+ return ret;
+
+}
diff -Nurp linux-2.6.12-rc2-mm1~orig/kernel/auditsc.c linux-2.6.12-rc2-mm1~audit/kernel/auditsc.c
--- linux-2.6.12-rc2-mm1~orig/kernel/auditsc.c 2005-04-11 14:15:36.000000000 +0000
+++ linux-2.6.12-rc2-mm1~audit/kernel/auditsc.c 2005-04-08 16:12:23.000000000 +0000
@@ -102,6 +102,7 @@ struct audit_aux_data {
};
#define AUDIT_AUX_IPCPERM 0
+#define AUDIT_AUX_WATCH 1
struct audit_aux_data_ipcctl {
struct audit_aux_data d;
@@ -112,6 +113,16 @@ struct audit_aux_data_ipcctl {
mode_t mode;
};
+struct audit_aux_data_watched {
+ struct audit_aux_data link;
+ struct audit_wentry *wentry;
+ unsigned long ino;
+ int mask;
+ uid_t uid;
+ gid_t gid;
+ dev_t dev;
+ dev_t rdev;
+};
/* The per-task audit context. */
struct audit_context {
@@ -665,6 +676,24 @@ static void audit_log_exit(struct audit_
audit_log_format(ab,
" qbytes=%lx uid=%d gid=%d mode=%x",
axi->qbytes, axi->uid, axi->gid, axi->mode);
+ break;
+ }
+
+ case AUDIT_AUX_WATCH: {
+ struct audit_aux_data_watched *axi = (void *)aux;
+ audit_log_format(ab, " name=");
+ audit_log_untrustedstring(ab, axi->wentry->w_watch->name);
+ audit_log_format(ab,
+ " filterkey=%s perm=%u perm_mask=%d"
+ " inode=%lu inode_uid=%d inode_gid=%d"
+ " inode_dev=%02x:%02x inode_rdev=%02x:%02x",
+ axi->wentry->w_watch->filterkey,
+ axi->wentry->w_watch->perms,
+ axi->mask, axi->ino, axi->uid, axi->gid,
+ MAJOR(axi->dev), MINOR(axi->dev),
+ MAJOR(axi->rdev), MINOR(axi->rdev));
+ audit_wentry_put(axi->wentry);
+ break;
}
}
audit_log_end(ab);
@@ -1024,3 +1053,52 @@ int audit_ipc_perms(unsigned long qbytes
context->aux = (void *)ax;
return 0;
}
+
+int audit_notify_watch(struct inode *inode, int mask)
+{
+ int ret = 0;
+ struct audit_context *context = current->audit_context;
+ struct audit_aux_data_watched *ax;
+ struct audit_wentry *wentry = NULL;
+
+ if (likely(!context))
+ goto audit_notify_watch_fail;
+
+ if (!inode)
+ goto audit_notify_watch_fail;
+
+ wentry = audit_wentry_get(inode->i_audit->wentry);
+ if (!wentry)
+ goto audit_notify_watch_fail;
+
+ if (mask && (wentry->w_watch->perms && !(wentry->w_watch->perms&mask)))
+ goto audit_notify_watch_fail;
+
+ ret = -ENOMEM;
+ ax = kmalloc(sizeof(*ax), GFP_KERNEL);
+ if (!ax)
+ goto audit_notify_watch_fail;
+
+ ret = 0;
+ if (context->in_syscall && !context->auditable)
+ context->auditable = 1;
+
+ ax->wentry = wentry;
+ ax->mask = mask;
+ ax->ino = inode->i_ino;
+ ax->uid = inode->i_uid;
+ ax->gid = inode->i_gid;
+ ax->dev = inode->i_sb->s_dev;
+ ax->rdev = inode->i_rdev;
+
+ ax->link.type = AUDIT_AUX_WATCH;
+ ax->link.next = context->aux;
+ context->aux = (void *)ax;
+
+ goto audit_notify_watch_exit;
+
+audit_notify_watch_fail:
+ audit_wentry_put(wentry);
+audit_notify_watch_exit:
+ return ret;
+}
diff -Nurp linux-2.6.12-rc2-mm1~orig/security/selinux/nlmsgtab.c linux-2.6.12-rc2-mm1~audit/security/selinux/nlmsgtab.c
--- linux-2.6.12-rc2-mm1~orig/security/selinux/nlmsgtab.c 2005-04-11 14:15:36.000000000 +0000
+++ linux-2.6.12-rc2-mm1~audit/security/selinux/nlmsgtab.c 2005-04-05 22:58:51.000000000 +0000
@@ -98,6 +98,9 @@ static struct nlmsg_perm nlmsg_audit_per
{ AUDIT_DEL, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
{ AUDIT_USER, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
{ AUDIT_LOGIN, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
+ { AUDIT_WATCH_INS, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
+ { AUDIT_WATCH_REM, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
+ { AUDIT_WATCH_LIST, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
};
19 years, 8 months
Fwd: [PATCH] SELinux: add finer grained permissions to Netlink audit processing
by Steve Grubb
Just so everyone knows...
---------- Forwarded Message ----------
Subject: [PATCH] SELinux: add finer grained permissions to Netlink audit
processing
Date: Tuesday 19 April 2005 11:29
From: James Morris <jmorris(a)redhat.com>
To: Andrew Morton <akpm(a)osdl.org>
Cc: linux-kernel(a)vger.kernel.org, Stephen Smalley <sds(a)epoch.ncsc.mil>, Steve
Grubb <sgrubb(a)redhat.com>
This patch provides finer grained permissions for the audit family of
Netlink sockets under SELinux.
1. We need a way to differentiate between privileged and unprivileged
reads of kernel data maintained by the audit subsystem. The AUDIT_GET
operation is unprivileged: it returns the current status of the audit
subsystem (e.g. whether it's enabled etc.). The AUDIT_LIST operation
however returns a list of the current audit ruleset, which is considered
privileged by the audit folk. To deal with this, a new SELinux permission
has been implemented and applied to the operation: nlmsg_readpriv, which
can be allocated to appropriately privileged domains. Unprivileged
domains would only be allocated nlmsg_read.
2. There is a requirement for certain domains to generate audit events
from userspace. These events need to be collected by the kernel, collated
and transmitted sequentially back to the audit daemon. An example is user
level login, an auditable event under CAPP, where login-related domains
generate AUDIT_USER messages via PAM which are relayed back to auditd via
the kernel. To prevent handing out nlmsg_write permissions to such
domains, a new permission has been added, nlmsg_relay, which is intended
for this type of purpose: data is passed via the kernel back to userspace
but no privileged information is written to the kernel.
Also, AUDIT_LOGIN messages are now valid only for kernel->user messaging,
so this value has been removed from the SELinux nlmsgtab (which is only
used to check user->kernel messages).
Please apply.
Signed-off-by: James Morris <jmorris(a)redhat.com>
Signed-off-by: Stephen Smalley <sds(a)tycho.nsa.gov>
---
security/selinux/include/av_perm_to_string.h | 2 ++
security/selinux/include/av_permissions.h | 2 ++
security/selinux/nlmsgtab.c | 13 ++++++-------
3 files changed, 10 insertions(+), 7 deletions(-)
diff -purN -X dontdiff
linux-2.6.12-rc2-mm3.o/security/selinux/include/av_permissions.h
linux-2.6.12-rc2-mm3.w1/security/selinux/include/av_permissions.h ---
linux-2.6.12-rc2-mm3.o/security/selinux/include/av_permissions.h 2005-04-14
21:02:39.000000000 -0400 +++
linux-2.6.12-rc2-mm3.w1/security/selinux/include/av_permissions.h 2005-04-15
15:32:36.000000000 -0400 @@ -840,6 +840,8 @@
#define NETLINK_AUDIT_SOCKET__NLMSG_READ 0x00400000UL
#define NETLINK_AUDIT_SOCKET__NLMSG_WRITE 0x00800000UL
+#define NETLINK_AUDIT_SOCKET__NLMSG_RELAY 0x01000000UL
+#define NETLINK_AUDIT_SOCKET__NLMSG_READPRIV 0x02000000UL
#define NETLINK_IP6FW_SOCKET__IOCTL 0x00000001UL
#define NETLINK_IP6FW_SOCKET__READ 0x00000002UL
diff -purN -X dontdiff
linux-2.6.12-rc2-mm3.o/security/selinux/include/av_perm_to_string.h
linux-2.6.12-rc2-mm3.w1/security/selinux/include/av_perm_to_string.h ---
linux-2.6.12-rc2-mm3.o/security/selinux/include/av_perm_to_string.h 2005-04-
14 21:02:39.000000000 -0400 +++
linux-2.6.12-rc2-mm3.w1/security/selinux/include/av_perm_to_string.h 2005-04
-15 15:32:00.000000000 -0400 @@ -220,6 +220,8 @@
S_(SECCLASS_NETLINK_XFRM_SOCKET, NETLINK_XFRM_SOCKET__NLMSG_WRITE,
"nlmsg_write") S_(SECCLASS_NETLINK_AUDIT_SOCKET,
NETLINK_AUDIT_SOCKET__NLMSG_READ, "nlmsg_read")
S_(SECCLASS_NETLINK_AUDIT_SOCKET, NETLINK_AUDIT_SOCKET__NLMSG_WRITE,
"nlmsg_write") + S_(SECCLASS_NETLINK_AUDIT_SOCKET,
NETLINK_AUDIT_SOCKET__NLMSG_RELAY, "nlmsg_relay") +
S_(SECCLASS_NETLINK_AUDIT_SOCKET, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV,
"nlmsg_readpriv") S_(SECCLASS_NETLINK_IP6FW_SOCKET,
NETLINK_IP6FW_SOCKET__NLMSG_READ, "nlmsg_read")
S_(SECCLASS_NETLINK_IP6FW_SOCKET, NETLINK_IP6FW_SOCKET__NLMSG_WRITE,
"nlmsg_write") S_(SECCLASS_DBUS, DBUS__ACQUIRE_SVC, "acquire_svc")
diff -purN -X dontdiff linux-2.6.12-rc2-mm3.o/security/selinux/nlmsgtab.c
linux-2.6.12-rc2-mm3.w1/security/selinux/nlmsgtab.c ---
linux-2.6.12-rc2-mm3.o/security/selinux/nlmsgtab.c 2005-04-14
21:02:39.000000000 -0400 +++
linux-2.6.12-rc2-mm3.w1/security/selinux/nlmsgtab.c 2005-04-15
16:42:33.000000000 -0400 @@ -91,13 +91,12 @@ static struct nlmsg_perm
nlmsg_xfrm_perm
static struct nlmsg_perm nlmsg_audit_perms[] =
{
- { AUDIT_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ },
- { AUDIT_SET, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
- { AUDIT_LIST, NETLINK_AUDIT_SOCKET__NLMSG_READ },
- { AUDIT_ADD, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
- { AUDIT_DEL, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
- { AUDIT_USER, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
- { AUDIT_LOGIN, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
+ { AUDIT_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ },
+ { AUDIT_SET, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
+ { AUDIT_LIST, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
+ { AUDIT_ADD, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
+ { AUDIT_DEL, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
+ { AUDIT_USER, NETLINK_AUDIT_SOCKET__NLMSG_RELAY },
};
-------------------------------------------------------
19 years, 8 months
RE: dcache_lock deadlock due to auditing
by Stephen Smalley
On Thu, 2005-04-14 at 12:06 -0400, Karl MacMillan wrote:
> Just to be clear, this decision is really to continue the movement away from avc
> messages being a complete source for audit message related to SELinux to both
> avc and syscall auditing being required to get a full picture. My sense is that
> this is the direction that things must go in for technical and political
> reasons, though I have to say that my preference would be (for what it's worth)
> for SELinux avc audit messages to be complete, self-contained, and be triggered
> even with DAC permissions deny access.
The SELinux avc audit messages will remain complete as far as having all
the information you need to tie it back to policy or generate policy
rules, i.e. the security contexts and class information. The auxiliary
audit information (pid, exe, path, port, ipaddr, etc) has always just
been to help track down the causes of denials. As far as being
triggered for DAC denials, that just isn't an option, as the LSM hooks
are placed after the DAC checks in most cases and won't be reached for
DAC denials. That avoids filling the logs with MAC denials that would
have been denied due to DAC anyway (which is quite common due to
application and library probing of the environment) and doesn't leak
information (since both the DAC denial and the MAC denial yield the same
error code). But if your real concern is capturing the relevant
security contexts upon a DAC denial, we can support that; SELinux
already provides hook functions for copying the contexts of processes
and files to buffers to support the /proc/pid/attr and xattr APIs, so
that audit framework can call those hooks and save that information for
processing by audit_log_exit upon DAC denials as well.
> At this point, my only real concern is that it be easier for users to get this
> information and I simply don't know enough about the audit infrastructure to
> know whether this will be the case or not. What kind of configuration will be
> required to get the additional syscall audit messages?
Boot your kernel with audit=1 or run auditctl -e 1 at any time. That
enables syscall auditing. Then, every time SELinux generates an audit
message via avc_audit, a syscall audit record will also be written at
syscall exit, and they can be tied together based on the
timestamp/serial number in the prefix.
--
Stephen Smalley <sds(a)tycho.nsa.gov>
National Security Agency
19 years, 8 months
RE: dcache_lock deadlock due to auditing
by Stephen Smalley
On Thu, 2005-04-14 at 13:35 -0700, Steve G wrote:
> >I'm guessing the security context obtained from the SELinux hooks are
> >is represented by a sid. Is this true?
>
> Yes. This patch is already part of the audit subsystem code and on its way
> upstream.
I didn't see the original posting, but the security_getprocattr (->
selinux_getprocattr) and security_inode_getsecurity (->
selinux_inode_getsecurity) hooks copy security contexts into buffers
supplied by the caller. That is what I was referring to. The pathname
lookup code would need to be modified to invoke
security_inode_getsecurity(), possibly from audit_inode() by passing the
inode structure to it, and copy the context into the auxiliary item list
on the current audit context for display upon audit_log_exit. And
audit_log_exit could be modified to call security_getprocattr to get the
current process context and display it. I don't believe anyone has done
that yet. There has been a patch to log the exe and comm information
for the current task upon audit_log_exit, but that is different.
--
Stephen Smalley <sds(a)tycho.nsa.gov>
National Security Agency
19 years, 8 months
