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[PATCH] log more info for directory entry change events
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@hp.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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@ -1127,7 +1127,7 @@ out:
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if (likely(retval == 0)) {
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if (unlikely(current->audit_context && nd && nd->dentry &&
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nd->dentry->d_inode))
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audit_inode(name, nd->dentry->d_inode, flags);
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audit_inode(name, nd->dentry->d_inode);
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}
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out_fail:
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return retval;
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@ -633,7 +633,7 @@ asmlinkage long sys_fchmod(unsigned int fd, mode_t mode)
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dentry = file->f_dentry;
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inode = dentry->d_inode;
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audit_inode(NULL, inode, 0);
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audit_inode(NULL, inode);
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err = -EROFS;
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if (IS_RDONLY(inode))
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@ -786,7 +786,7 @@ asmlinkage long sys_fchown(unsigned int fd, uid_t user, gid_t group)
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if (file) {
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struct dentry * dentry;
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dentry = file->f_dentry;
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audit_inode(NULL, dentry->d_inode, 0);
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audit_inode(NULL, dentry->d_inode);
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error = chown_common(dentry, user, group);
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fput(file);
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}
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@ -242,7 +242,7 @@ sys_fsetxattr(int fd, char __user *name, void __user *value,
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if (!f)
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return error;
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dentry = f->f_dentry;
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audit_inode(NULL, dentry->d_inode, 0);
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audit_inode(NULL, dentry->d_inode);
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error = setxattr(dentry, name, value, size, flags);
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fput(f);
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return error;
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@ -469,7 +469,7 @@ sys_fremovexattr(int fd, char __user *name)
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if (!f)
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return error;
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dentry = f->f_dentry;
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audit_inode(NULL, dentry->d_inode, 0);
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audit_inode(NULL, dentry->d_inode);
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error = removexattr(dentry, name);
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fput(f);
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return error;
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@ -310,7 +310,7 @@ extern void audit_syscall_entry(int arch,
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extern void audit_syscall_exit(int failed, long return_code);
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extern void __audit_getname(const char *name);
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extern void audit_putname(const char *name);
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extern void __audit_inode(const char *name, const struct inode *inode, unsigned flags);
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extern void __audit_inode(const char *name, const struct inode *inode);
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extern void __audit_inode_child(const char *dname, const struct inode *inode,
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unsigned long pino);
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static inline void audit_getname(const char *name)
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@ -318,10 +318,9 @@ static inline void audit_getname(const char *name)
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if (unlikely(current->audit_context))
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__audit_getname(name);
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}
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static inline void audit_inode(const char *name, const struct inode *inode,
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unsigned flags) {
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static inline void audit_inode(const char *name, const struct inode *inode) {
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if (unlikely(current->audit_context))
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__audit_inode(name, inode, flags);
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__audit_inode(name, inode);
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}
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static inline void audit_inode_child(const char *dname,
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const struct inode *inode,
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@ -398,9 +397,9 @@ static inline int audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
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#define audit_syscall_exit(f,r) do { ; } while (0)
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#define audit_getname(n) do { ; } while (0)
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#define audit_putname(n) do { ; } while (0)
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#define __audit_inode(n,i,f) do { ; } while (0)
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#define __audit_inode(n,i) do { ; } while (0)
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#define __audit_inode_child(d,i,p) do { ; } while (0)
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#define audit_inode(n,i,f) do { ; } while (0)
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#define audit_inode(n,i) do { ; } while (0)
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#define audit_inode_child(d,i,p) do { ; } while (0)
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#define auditsc_get_stamp(c,t,s) do { BUG(); } while (0)
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#define audit_get_loginuid(c) ({ -1; })
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@ -435,6 +434,9 @@ extern void audit_log_hex(struct audit_buffer *ab,
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size_t len);
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extern const char * audit_log_untrustedstring(struct audit_buffer *ab,
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const char *string);
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extern const char * audit_log_n_untrustedstring(struct audit_buffer *ab,
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size_t n,
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const char *string);
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extern void audit_log_d_path(struct audit_buffer *ab,
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const char *prefix,
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struct dentry *dentry,
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@ -452,6 +454,7 @@ extern int audit_receive_filter(int type, int pid, int uid, int seq,
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#define audit_log_end(b) do { ; } while (0)
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#define audit_log_hex(a,b,l) do { ; } while (0)
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#define audit_log_untrustedstring(a,s) do { ; } while (0)
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#define audit_log_n_untrustedstring(a,n,s) do { ; } while (0)
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#define audit_log_d_path(b,p,d,v) do { ; } while (0)
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#endif
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#endif
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@ -67,8 +67,7 @@ static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
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if (source) {
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inotify_inode_queue_event(source, IN_MOVE_SELF, 0, NULL, NULL);
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}
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audit_inode_child(old_name, source, old_dir->i_ino);
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audit_inode_child(new_name, target, new_dir->i_ino);
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audit_inode_child(new_name, source, new_dir->i_ino);
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}
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/*
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@ -1051,20 +1051,53 @@ void audit_log_hex(struct audit_buffer *ab, const unsigned char *buf,
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skb_put(skb, len << 1); /* new string is twice the old string */
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}
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/*
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* Format a string of no more than slen characters into the audit buffer,
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* enclosed in quote marks.
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*/
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static void audit_log_n_string(struct audit_buffer *ab, size_t slen,
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const char *string)
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{
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int avail, new_len;
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unsigned char *ptr;
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struct sk_buff *skb;
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BUG_ON(!ab->skb);
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skb = ab->skb;
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avail = skb_tailroom(skb);
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new_len = slen + 3; /* enclosing quotes + null terminator */
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if (new_len > avail) {
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avail = audit_expand(ab, new_len);
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if (!avail)
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return;
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}
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ptr = skb->tail;
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*ptr++ = '"';
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memcpy(ptr, string, slen);
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ptr += slen;
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*ptr++ = '"';
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*ptr = 0;
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skb_put(skb, slen + 2); /* don't include null terminator */
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}
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/**
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* audit_log_unstrustedstring - log a string that may contain random characters
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* audit_log_n_unstrustedstring - log a string that may contain random characters
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* @ab: audit_buffer
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* @len: lenth of string (not including trailing null)
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* @string: string to be logged
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*
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* This code will escape a string that is passed to it if the string
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* contains a control character, unprintable character, double quote mark,
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* or a space. Unescaped strings will start and end with a double quote mark.
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* Strings that are escaped are printed in hex (2 digits per char).
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*
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* The caller specifies the number of characters in the string to log, which may
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* or may not be the entire string.
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*/
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const char *audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
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const char *audit_log_n_untrustedstring(struct audit_buffer *ab, size_t len,
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const char *string)
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{
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const unsigned char *p = string;
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size_t len = strlen(string);
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while (*p) {
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if (*p == '"' || *p < 0x21 || *p > 0x7f) {
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@ -1073,10 +1106,23 @@ const char *audit_log_untrustedstring(struct audit_buffer *ab, const char *strin
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}
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p++;
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}
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audit_log_format(ab, "\"%s\"", string);
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audit_log_n_string(ab, len, string);
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return p + 1;
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}
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/**
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* audit_log_unstrustedstring - log a string that may contain random characters
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* @ab: audit_buffer
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* @string: string to be logged
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*
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* Same as audit_log_n_unstrustedstring(), except that strlen is used to
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* determine string length.
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*/
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const char *audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
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{
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return audit_log_n_untrustedstring(ab, strlen(string), string);
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}
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/* This is a helper-function to print the escaped d_path */
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void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
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struct dentry *dentry, struct vfsmount *vfsmnt)
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@ -104,7 +104,8 @@ static inline int audit_hash_ino(u32 ino)
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}
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extern int audit_comparator(const u32 left, const u32 op, const u32 right);
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extern int audit_compare_dname_path(const char *dname, const char *path);
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extern int audit_compare_dname_path(const char *dname, const char *path,
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int *dirlen);
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extern struct sk_buff * audit_make_reply(int pid, int seq, int type,
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int done, int multi,
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void *payload, int size);
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@ -787,7 +787,7 @@ static void audit_update_watch(struct audit_parent *parent,
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mutex_lock(&audit_filter_mutex);
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list_for_each_entry_safe(owatch, nextw, &parent->watches, wlist) {
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if (audit_compare_dname_path(dname, owatch->path))
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if (audit_compare_dname_path(dname, owatch->path, NULL))
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continue;
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/* If the update involves invalidating rules, do the inode-based
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@ -1387,7 +1387,8 @@ int audit_comparator(const u32 left, const u32 op, const u32 right)
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/* Compare given dentry name with last component in given path,
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* return of 0 indicates a match. */
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int audit_compare_dname_path(const char *dname, const char *path)
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int audit_compare_dname_path(const char *dname, const char *path,
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int *dirlen)
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{
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int dlen, plen;
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const char *p;
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@ -1416,6 +1417,9 @@ int audit_compare_dname_path(const char *dname, const char *path)
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p++;
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}
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/* return length of path's directory component */
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if (dirlen)
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*dirlen = p - path;
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return strncmp(p, dname, dlen);
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}
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117
kernel/auditsc.c
117
kernel/auditsc.c
@ -82,6 +82,9 @@ extern int audit_enabled;
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* path_lookup. */
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#define AUDIT_NAMES_RESERVED 7
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/* Indicates that audit should log the full pathname. */
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#define AUDIT_NAME_FULL -1
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/* When fs/namei.c:getname() is called, we store the pointer in name and
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* we don't let putname() free it (instead we free all of the saved
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* pointers at syscall exit time).
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@ -89,8 +92,9 @@ extern int audit_enabled;
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* Further, in fs/namei.c:path_lookup() we store the inode and device. */
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struct audit_names {
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const char *name;
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int name_len; /* number of name's characters to log */
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unsigned name_put; /* call __putname() for this name */
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unsigned long ino;
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unsigned long pino;
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dev_t dev;
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umode_t mode;
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uid_t uid;
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@ -296,12 +300,10 @@ static int audit_filter_rules(struct task_struct *tsk,
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break;
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case AUDIT_INODE:
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if (name)
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result = (name->ino == f->val ||
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name->pino == f->val);
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result = (name->ino == f->val);
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else if (ctx) {
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for (j = 0; j < ctx->name_count; j++) {
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if (audit_comparator(ctx->names[j].ino, f->op, f->val) ||
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audit_comparator(ctx->names[j].pino, f->op, f->val)) {
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if (audit_comparator(ctx->names[j].ino, f->op, f->val)) {
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++result;
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break;
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}
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@ -311,8 +313,7 @@ static int audit_filter_rules(struct task_struct *tsk,
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case AUDIT_WATCH:
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if (name && rule->watch->ino != (unsigned long)-1)
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result = (name->dev == rule->watch->dev &&
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(name->ino == rule->watch->ino ||
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name->pino == rule->watch->ino));
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name->ino == rule->watch->ino);
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break;
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case AUDIT_LOGINUID:
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result = 0;
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@ -526,7 +527,7 @@ static inline void audit_free_names(struct audit_context *context)
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#endif
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for (i = 0; i < context->name_count; i++) {
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if (context->names[i].name)
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if (context->names[i].name && context->names[i].name_put)
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__putname(context->names[i].name);
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}
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context->name_count = 0;
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@ -850,8 +851,7 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
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}
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}
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for (i = 0; i < context->name_count; i++) {
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unsigned long ino = context->names[i].ino;
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unsigned long pino = context->names[i].pino;
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struct audit_names *n = &context->names[i];
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ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH);
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if (!ab)
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@ -859,33 +859,47 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
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audit_log_format(ab, "item=%d", i);
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if (n->name) {
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switch(n->name_len) {
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case AUDIT_NAME_FULL:
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/* log the full path */
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audit_log_format(ab, " name=");
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if (context->names[i].name)
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audit_log_untrustedstring(ab, context->names[i].name);
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else
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audit_log_format(ab, "(null)");
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audit_log_untrustedstring(ab, n->name);
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break;
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case 0:
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/* name was specified as a relative path and the
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* directory component is the cwd */
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audit_log_d_path(ab, " name=", context->pwd,
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context->pwdmnt);
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break;
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default:
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/* log the name's directory component */
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audit_log_format(ab, " name=");
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audit_log_n_untrustedstring(ab, n->name_len,
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n->name);
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}
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} else
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audit_log_format(ab, " name=(null)");
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if (pino != (unsigned long)-1)
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audit_log_format(ab, " parent=%lu", pino);
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if (ino != (unsigned long)-1)
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audit_log_format(ab, " inode=%lu", ino);
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if ((pino != (unsigned long)-1) || (ino != (unsigned long)-1))
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audit_log_format(ab, " dev=%02x:%02x mode=%#o"
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if (n->ino != (unsigned long)-1) {
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audit_log_format(ab, " inode=%lu"
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" dev=%02x:%02x mode=%#o"
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" ouid=%u ogid=%u rdev=%02x:%02x",
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MAJOR(context->names[i].dev),
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MINOR(context->names[i].dev),
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context->names[i].mode,
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context->names[i].uid,
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context->names[i].gid,
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MAJOR(context->names[i].rdev),
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MINOR(context->names[i].rdev));
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if (context->names[i].osid != 0) {
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n->ino,
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MAJOR(n->dev),
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MINOR(n->dev),
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n->mode,
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n->uid,
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n->gid,
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MAJOR(n->rdev),
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MINOR(n->rdev));
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}
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if (n->osid != 0) {
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char *ctx = NULL;
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u32 len;
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if (selinux_ctxid_to_string(
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context->names[i].osid, &ctx, &len)) {
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audit_log_format(ab, " osid=%u",
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context->names[i].osid);
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n->osid, &ctx, &len)) {
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audit_log_format(ab, " osid=%u", n->osid);
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call_panic = 2;
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} else
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audit_log_format(ab, " obj=%s", ctx);
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@ -1075,6 +1089,8 @@ void __audit_getname(const char *name)
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}
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BUG_ON(context->name_count >= AUDIT_NAMES);
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context->names[context->name_count].name = name;
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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, const struct inode *inode)
|
||||
* 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 @@ void __audit_inode(const char *name, const struct inode *inode, unsigned flags)
|
||||
++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 *dname, const struct inode *inode,
|
||||
{
|
||||
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;
|
||||
}
|
||||
|
||||
/**
|
||||
|
Loading…
Reference in New Issue
Block a user