[PATCH] log more info for directory entry change events
Amy Griffis
amy.griffis at hp.com
Fri Jun 9 03:19:31 UTC 2006
When an audit event involves changes to a directory entry, include
a PATH record for the directory itself. A few other notable changes:
- fixed audit_inode_child() hooks in fsnotify_move()
- removed unused flags arg from audit_inode()
- added audit log routines for logging a portion of a string
Here's some sample output.
before patch:
type=SYSCALL msg=audit(1149821605.320:26): arch=40000003 syscall=39 success=yes exit=0 a0=bf8d3c7c a1=1ff a2=804e1b8 a3=bf8d3c7c items=1 ppid=739 pid=800 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=ttyS0 comm="mkdir" exe="/bin/mkdir" subj=root:system_r:unconfined_t:s0-s0:c0.c255
type=CWD msg=audit(1149821605.320:26): cwd="/root"
type=PATH msg=audit(1149821605.320:26): item=0 name="foo" parent=164068 inode=164010 dev=03:00 mode=040755 ouid=0 ogid=0 rdev=00:00 obj=root:object_r:user_home_t:s0
after patch:
type=SYSCALL msg=audit(1149822032.332:24): arch=40000003 syscall=39 success=yes exit=0 a0=bfdd9c7c a1=1ff a2=804e1b8 a3=bfdd9c7c items=2 ppid=714 pid=777 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=ttyS0 comm="mkdir" exe="/bin/mkdir" subj=root:system_r:unconfined_t:s0-s0:c0.c255
type=CWD msg=audit(1149822032.332:24): cwd="/root"
type=PATH msg=audit(1149822032.332:24): item=0 name="/root" inode=164068 dev=03:00 mode=040750 ouid=0 ogid=0 rdev=00:00 obj=root:object_r:user_home_dir_t:s0
type=PATH msg=audit(1149822032.332:24): item=1 name="foo" inode=164010 dev=03:00 mode=040755 ouid=0 ogid=0 rdev=00:00 obj=root:object_r:user_home_t:s0
Signed-off-by: Amy Griffis <amy.griffis at hp.com>
---
fs/namei.c | 2 -
fs/open.c | 4 +
fs/xattr.c | 4 +
include/linux/audit.h | 15 +++---
include/linux/fsnotify.h | 3 -
kernel/audit.c | 54 +++++++++++++++++++-
kernel/audit.h | 3 +
kernel/auditfilter.c | 8 ++-
kernel/auditsc.c | 123 ++++++++++++++++++++++++++--------------------
9 files changed, 142 insertions(+), 74 deletions(-)
4080b3bfb911fc9501a7256ed59da3c159ced915
diff --git a/fs/namei.c b/fs/namei.c
index 96723ae..6c5ae0d 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1125,7 +1125,7 @@ out:
if (likely(retval == 0)) {
if (unlikely(current->audit_context && nd && nd->dentry &&
nd->dentry->d_inode))
- audit_inode(name, nd->dentry->d_inode, flags);
+ audit_inode(name, nd->dentry->d_inode);
}
return retval;
diff --git a/fs/open.c b/fs/open.c
index 317b7c7..4f178ac 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -633,7 +633,7 @@ asmlinkage long sys_fchmod(unsigned int
dentry = file->f_dentry;
inode = dentry->d_inode;
- audit_inode(NULL, inode, 0);
+ audit_inode(NULL, inode);
err = -EROFS;
if (IS_RDONLY(inode))
@@ -786,7 +786,7 @@ asmlinkage long sys_fchown(unsigned int
if (file) {
struct dentry * dentry;
dentry = file->f_dentry;
- audit_inode(NULL, dentry->d_inode, 0);
+ audit_inode(NULL, dentry->d_inode);
error = chown_common(dentry, user, group);
fput(file);
}
diff --git a/fs/xattr.c b/fs/xattr.c
index e416190..c32f15b 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -242,7 +242,7 @@ sys_fsetxattr(int fd, char __user *name,
if (!f)
return error;
dentry = f->f_dentry;
- audit_inode(NULL, dentry->d_inode, 0);
+ audit_inode(NULL, dentry->d_inode);
error = setxattr(dentry, name, value, size, flags);
fput(f);
return error;
@@ -469,7 +469,7 @@ sys_fremovexattr(int fd, char __user *na
if (!f)
return error;
dentry = f->f_dentry;
- audit_inode(NULL, dentry->d_inode, 0);
+ audit_inode(NULL, dentry->d_inode);
error = removexattr(dentry, name);
fput(f);
return error;
diff --git a/include/linux/audit.h b/include/linux/audit.h
index c783275..295defe 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -310,7 +310,7 @@ extern void audit_syscall_entry(int arch
extern void audit_syscall_exit(int failed, long return_code);
extern void __audit_getname(const char *name);
extern void audit_putname(const char *name);
-extern void __audit_inode(const char *name, const struct inode *inode, unsigned flags);
+extern void __audit_inode(const char *name, const struct inode *inode);
extern void __audit_inode_child(const char *dname, const struct inode *inode,
unsigned long pino);
static inline void audit_getname(const char *name)
@@ -318,10 +318,9 @@ static inline void audit_getname(const c
if (unlikely(current->audit_context))
__audit_getname(name);
}
-static inline void audit_inode(const char *name, const struct inode *inode,
- unsigned flags) {
+static inline void audit_inode(const char *name, const struct inode *inode) {
if (unlikely(current->audit_context))
- __audit_inode(name, inode, flags);
+ __audit_inode(name, inode);
}
static inline void audit_inode_child(const char *dname,
const struct inode *inode,
@@ -398,9 +397,9 @@ #define audit_syscall_entry(ta,a,b,c,d,e
#define audit_syscall_exit(f,r) do { ; } while (0)
#define audit_getname(n) do { ; } while (0)
#define audit_putname(n) do { ; } while (0)
-#define __audit_inode(n,i,f) do { ; } while (0)
+#define __audit_inode(n,i) do { ; } while (0)
#define __audit_inode_child(d,i,p) do { ; } while (0)
-#define audit_inode(n,i,f) do { ; } while (0)
+#define audit_inode(n,i) do { ; } while (0)
#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; })
@@ -435,6 +434,9 @@ extern void audit_log_hex(struct au
size_t len);
extern const char * audit_log_untrustedstring(struct audit_buffer *ab,
const char *string);
+extern const char * audit_log_n_untrustedstring(struct audit_buffer *ab,
+ unsigned n,
+ const char *string);
extern void audit_log_d_path(struct audit_buffer *ab,
const char *prefix,
struct dentry *dentry,
@@ -452,6 +454,7 @@ #define audit_log_format(b,f,...) do { ;
#define audit_log_end(b) do { ; } while (0)
#define audit_log_hex(a,b,l) do { ; } while (0)
#define audit_log_untrustedstring(a,s) do { ; } while (0)
+#define audit_log_n_untrustedstring(a,n,s) do { ; } while (0)
#define audit_log_d_path(b,p,d,v) do { ; } while (0)
#endif
#endif
diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
index a9d3044..cc5dec7 100644
--- a/include/linux/fsnotify.h
+++ b/include/linux/fsnotify.h
@@ -67,8 +67,7 @@ static inline void fsnotify_move(struct
if (source) {
inotify_inode_queue_event(source, IN_MOVE_SELF, 0, NULL, NULL);
}
- audit_inode_child(old_name, source, old_dir->i_ino);
- audit_inode_child(new_name, target, new_dir->i_ino);
+ audit_inode_child(new_name, source, new_dir->i_ino);
}
/*
diff --git a/kernel/audit.c b/kernel/audit.c
index 0fbf1c1..7dfac70 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1051,20 +1051,53 @@ void audit_log_hex(struct audit_buffer *
skb_put(skb, len << 1); /* new string is twice the old string */
}
+/*
+ * Format a string of no more than slen characters into the audit buffer,
+ * enclosed in quote marks.
+ */
+static void audit_log_n_string(struct audit_buffer *ab, size_t slen,
+ const char *string)
+{
+ int avail, new_len;
+ unsigned char *ptr;
+ struct sk_buff *skb;
+
+ BUG_ON(!ab->skb);
+ skb = ab->skb;
+ avail = skb_tailroom(skb);
+ new_len = slen + 3; /* enclosing quotes + null terminator */
+ if (new_len > avail) {
+ avail = audit_expand(ab, new_len);
+ if (!avail)
+ return;
+ }
+ ptr = skb->tail;
+ *ptr++ = '"';
+ memcpy(ptr, string, slen);
+ ptr += slen;
+ *ptr++ = '"';
+ *ptr = 0;
+ skb_put(skb, slen + 2); /* don't include null terminator */
+}
+
/**
- * audit_log_unstrustedstring - log a string that may contain random characters
+ * audit_log_n_unstrustedstring - log a string that may contain random characters
* @ab: audit_buffer
+ * @len: lenth of string (not including trailing null)
* @string: string to be logged
*
* This code will escape a string that is passed to it if the string
* contains a control character, unprintable character, double quote mark,
* or a space. Unescaped strings will start and end with a double quote mark.
* Strings that are escaped are printed in hex (2 digits per char).
+ *
+ * The caller specifies the number of characters in the string to log, which may
+ * or may not be the entire string.
*/
-const char *audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
+const char *audit_log_n_untrustedstring(struct audit_buffer *ab, size_t len,
+ const char *string)
{
const unsigned char *p = string;
- size_t len = strlen(string);
while (*p) {
if (*p == '"' || *p < 0x21 || *p > 0x7f) {
@@ -1073,10 +1106,23 @@ const char *audit_log_untrustedstring(st
}
p++;
}
- audit_log_format(ab, "\"%s\"", string);
+ audit_log_n_string(ab, len, string);
return p + 1;
}
+/**
+ * audit_log_unstrustedstring - log a string that may contain random characters
+ * @ab: audit_buffer
+ * @string: string to be logged
+ *
+ * Same as audit_log_n_unstrustedstring(), except that strlen is used to
+ * determine string length.
+ */
+const char *audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
+{
+ return audit_log_n_untrustedstring(ab, strlen(string), string);
+}
+
/* This is a helper-function to print the escaped d_path */
void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
struct dentry *dentry, struct vfsmount *vfsmnt)
diff --git a/kernel/audit.h b/kernel/audit.h
index 58fa44c..8323e41 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -104,7 +104,8 @@ static inline int audit_hash_ino(u32 ino
}
extern int audit_comparator(const u32 left, const u32 op, const u32 right);
-extern int audit_compare_dname_path(const char *dname, const char *path);
+extern int audit_compare_dname_path(const char *dname, const char *path,
+ int *dirlen);
extern struct sk_buff * audit_make_reply(int pid, int seq, int type,
int done, int multi,
void *payload, int size);
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 461f404..30015fd 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -787,7 +787,7 @@ static inline void audit_update_watch(st
mutex_lock(&audit_filter_mutex);
list_for_each_entry_safe(owatch, nextw, &parent->watches, wlist) {
- if (audit_compare_dname_path(dname, owatch->path))
+ if (audit_compare_dname_path(dname, owatch->path, NULL))
continue;
/* If the update involves invalidating rules, do the inode-based
@@ -1387,7 +1387,8 @@ int audit_comparator(const u32 left, con
/* Compare given dentry name with last component in given path,
* return of 0 indicates a match. */
-int audit_compare_dname_path(const char *dname, const char *path)
+int audit_compare_dname_path(const char *dname, const char *path,
+ int *dirlen)
{
int dlen, plen;
const char *p;
@@ -1416,6 +1417,9 @@ int audit_compare_dname_path(const char
p++;
}
+ /* return length of path's directory component */
+ if (dirlen)
+ *dirlen = p - path;
return strncmp(p, dname, dlen);
}
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 8503401..ba8520d 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -82,6 +82,9 @@ #define AUDIT_NAMES 20
* path_lookup. */
#define AUDIT_NAMES_RESERVED 7
+/* Indicates that audit should log the full pathname. */
+#define AUDIT_NAME_FULL -1
+
/* When fs/namei.c:getname() is called, we store the pointer in name and
* we don't let putname() free it (instead we free all of the saved
* pointers at syscall exit time).
@@ -89,8 +92,9 @@ #define AUDIT_NAMES_RESERVED 7
* Further, in fs/namei.c:path_lookup() we store the inode and device. */
struct audit_names {
const char *name;
+ int name_len; /* number of name's characters to log */
+ unsigned name_put; /* call __putname() for this name */
unsigned long ino;
- unsigned long pino;
dev_t dev;
umode_t mode;
uid_t uid;
@@ -296,12 +300,10 @@ static int audit_filter_rules(struct tas
break;
case AUDIT_INODE:
if (name)
- result = (name->ino == f->val ||
- name->pino == f->val);
+ result = (name->ino == f->val);
else if (ctx) {
for (j = 0; j < ctx->name_count; j++) {
- if (audit_comparator(ctx->names[j].ino, f->op, f->val) ||
- audit_comparator(ctx->names[j].pino, f->op, f->val)) {
+ if (audit_comparator(ctx->names[j].ino, f->op, f->val)) {
++result;
break;
}
@@ -311,8 +313,7 @@ static int audit_filter_rules(struct tas
case AUDIT_WATCH:
if (name && rule->watch->ino != (unsigned long)-1)
result = (name->dev == rule->watch->dev &&
- (name->ino == rule->watch->ino ||
- name->pino == rule->watch->ino));
+ name->ino == rule->watch->ino);
break;
case AUDIT_LOGINUID:
result = 0;
@@ -526,7 +527,7 @@ #if AUDIT_DEBUG
#endif
for (i = 0; i < context->name_count; i++) {
- if (context->names[i].name)
+ if (context->names[i].name && context->names[i].name_put)
__putname(context->names[i].name);
}
context->name_count = 0;
@@ -850,8 +851,7 @@ static void audit_log_exit(struct audit_
}
}
for (i = 0; i < context->name_count; i++) {
- unsigned long ino = context->names[i].ino;
- unsigned long pino = context->names[i].pino;
+ struct audit_names *n = &context->names[i];
ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH);
if (!ab)
@@ -859,33 +859,47 @@ static void audit_log_exit(struct audit_
audit_log_format(ab, "item=%d", i);
- audit_log_format(ab, " name=");
- if (context->names[i].name)
- audit_log_untrustedstring(ab, context->names[i].name);
- else
- audit_log_format(ab, "(null)");
-
- if (pino != (unsigned long)-1)
- audit_log_format(ab, " parent=%lu", pino);
- if (ino != (unsigned long)-1)
- audit_log_format(ab, " inode=%lu", ino);
- if ((pino != (unsigned long)-1) || (ino != (unsigned long)-1))
- audit_log_format(ab, " dev=%02x:%02x mode=%#o"
- " ouid=%u ogid=%u rdev=%02x:%02x",
- MAJOR(context->names[i].dev),
- MINOR(context->names[i].dev),
- context->names[i].mode,
- context->names[i].uid,
- context->names[i].gid,
- MAJOR(context->names[i].rdev),
- MINOR(context->names[i].rdev));
- if (context->names[i].osid != 0) {
+ if (n->name) {
+ switch(n->name_len) {
+ case AUDIT_NAME_FULL:
+ /* log the full path */
+ audit_log_format(ab, " name=");
+ audit_log_untrustedstring(ab, n->name);
+ break;
+ case 0:
+ /* name was specified as a relative path and the
+ * directory component is the cwd */
+ audit_log_d_path(ab, "name=", context->pwd,
+ context->pwdmnt);
+ break;
+ default:
+ /* log the name's directory component */
+ audit_log_format(ab, " name=");
+ audit_log_n_untrustedstring(ab, n->name_len,
+ n->name);
+ }
+ } else
+ audit_log_format(ab, "name=(null)");
+
+ if (n->ino != (unsigned long)-1) {
+ audit_log_format(ab, " inode=%lu"
+ " dev=%02x:%02x mode=%#o"
+ " ouid=%u ogid=%u rdev=%02x:%02x",
+ n->ino,
+ MAJOR(n->dev),
+ MINOR(n->dev),
+ n->mode,
+ n->uid,
+ n->gid,
+ MAJOR(n->rdev),
+ MINOR(n->rdev));
+ }
+ if (n->osid != 0) {
char *ctx = NULL;
u32 len;
if (selinux_ctxid_to_string(
- context->names[i].osid, &ctx, &len)) {
- audit_log_format(ab, " osid=%u",
- context->names[i].osid);
+ n->osid, &ctx, &len)) {
+ audit_log_format(ab, " osid=%u", n->osid);
call_panic = 2;
} else
audit_log_format(ab, " obj=%s", ctx);
@@ -1075,6 +1089,8 @@ #endif
}
BUG_ON(context->name_count >= AUDIT_NAMES);
context->names[context->name_count].name = name;
+ context->names[context->name_count].name_len = AUDIT_NAME_FULL;
+ context->names[context->name_count].name_put = 1;
context->names[context->name_count].ino = (unsigned long)-1;
++context->name_count;
if (!context->pwd) {
@@ -1141,11 +1157,10 @@ static void audit_inode_context(int idx,
* audit_inode - store the inode and device from a lookup
* @name: name being audited
* @inode: inode being audited
- * @flags: lookup flags (as used in path_lookup())
*
* Called from fs/namei.c:path_lookup().
*/
-void __audit_inode(const char *name, const struct inode *inode, unsigned flags)
+void __audit_inode(const char *name, const struct inode *inode)
{
int idx;
struct audit_context *context = current->audit_context;
@@ -1171,20 +1186,13 @@ #if AUDIT_DEBUG
++context->ino_count;
#endif
}
+ context->names[idx].ino = inode->i_ino;
context->names[idx].dev = inode->i_sb->s_dev;
context->names[idx].mode = inode->i_mode;
context->names[idx].uid = inode->i_uid;
context->names[idx].gid = inode->i_gid;
context->names[idx].rdev = inode->i_rdev;
audit_inode_context(idx, inode);
- if ((flags & LOOKUP_PARENT) && (strcmp(name, "/") != 0) &&
- (strcmp(name, ".") != 0)) {
- context->names[idx].ino = (unsigned long)-1;
- context->names[idx].pino = inode->i_ino;
- } else {
- context->names[idx].ino = inode->i_ino;
- context->names[idx].pino = (unsigned long)-1;
- }
}
/**
@@ -1206,34 +1214,40 @@ void __audit_inode_child(const char *dna
{
int idx;
struct audit_context *context = current->audit_context;
+ const char *found_name = NULL;
+ int dirlen = 0;
if (!context->in_syscall)
return;
/* determine matching parent */
if (!dname)
- goto no_match;
+ goto update_context;
for (idx = 0; idx < context->name_count; idx++)
- if (context->names[idx].pino == pino) {
+ if (context->names[idx].ino == pino) {
const char *name = context->names[idx].name;
if (!name)
continue;
- if (audit_compare_dname_path(dname, name) == 0)
- goto update_context;
+ if (audit_compare_dname_path(dname, name, &dirlen) == 0) {
+ context->names[idx].name_len = dirlen;
+ found_name = name;
+ break;
+ }
}
-no_match:
- /* catch-all in case match not found */
+update_context:
idx = context->name_count++;
- context->names[idx].name = NULL;
- context->names[idx].pino = pino;
#if AUDIT_DEBUG
context->ino_count++;
#endif
+ /* Re-use the name belonging to the slot for a matching parent directory.
+ * All names for this context are relinquished in audit_free_names() */
+ context->names[idx].name = found_name;
+ context->names[idx].name_len = AUDIT_NAME_FULL;
+ context->names[idx].name_put = 0; /* don't call __putname() */
-update_context:
if (inode) {
context->names[idx].ino = inode->i_ino;
context->names[idx].dev = inode->i_sb->s_dev;
@@ -1242,7 +1256,8 @@ update_context:
context->names[idx].gid = inode->i_gid;
context->names[idx].rdev = inode->i_rdev;
audit_inode_context(idx, inode);
- }
+ } else
+ context->names[idx].ino = (unsigned long)-1;
}
/**
--
1.3.0
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