1 files changed, 217 insertions, 0 deletions

diff --git a/security/apparmor/include/file.h b/security/apparmor/include/file.h
new file mode 100644
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+++ b/security/apparmor/include/file.h
@@ -0,0 +1,217 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor file mediation function definitions.
+ *
+ * Copyright (C) 1998-2008 Novell/SUSE
+ * Copyright 2009-2010 Canonical Ltd.
+ *
+ * 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, version 2 of the
+ * License.
+ */
+
+#ifndef __AA_FILE_H
+#define __AA_FILE_H
+
+#include <linux/path.h>
+
+#include "domain.h"
+#include "match.h"
+
+struct aa_profile;
+
+/*
+ * We use MAY_EXEC, MAY_WRITE, MAY_READ, MAY_APPEND and the following flags
+ * for profile permissions
+ */
+#define AA_MAY_CREATE                  0x0010
+#define AA_MAY_DELETE                  0x0020
+#define AA_MAY_META_WRITE              0x0040
+#define AA_MAY_META_READ               0x0080
+
+#define AA_MAY_CHMOD                   0x0100
+#define AA_MAY_CHOWN                   0x0200
+#define AA_MAY_LOCK                    0x0400
+#define AA_EXEC_MMAP                   0x0800
+
+#define AA_MAY_LINK                     0x1000
+#define AA_LINK_SUBSET                  AA_MAY_LOCK     /* overlaid */
+#define AA_MAY_ONEXEC                   0x40000000      /* exec allows onexec */
+#define AA_MAY_CHANGE_PROFILE           0x80000000
+#define AA_MAY_CHANGEHAT                0x80000000      /* ctrl auditing only */
+
+#define AA_AUDIT_FILE_MASK      (MAY_READ | MAY_WRITE | MAY_EXEC | MAY_APPEND |\
+                                 AA_MAY_CREATE | AA_MAY_DELETE |        \
+                                 AA_MAY_META_READ | AA_MAY_META_WRITE | \
+                                 AA_MAY_CHMOD | AA_MAY_CHOWN | AA_MAY_LOCK | \
+                                 AA_EXEC_MMAP | AA_MAY_LINK)
+
+/*
+ * The xindex is broken into 3 parts
+ * - index - an index into either the exec name table or the variable table
+ * - exec type - which determines how the executable name and index are used
+ * - flags - which modify how the destination name is applied
+ */
+#define AA_X_INDEX_MASK         0x03ff
+
+#define AA_X_TYPE_MASK          0x0c00
+#define AA_X_TYPE_SHIFT         10
+#define AA_X_NONE               0x0000
+#define AA_X_NAME               0x0400  /* use executable name px */
+#define AA_X_TABLE              0x0800  /* use a specified name ->n# */
+
+#define AA_X_UNSAFE             0x1000
+#define AA_X_CHILD              0x2000  /* make >AA_X_NONE apply to children */
+#define AA_X_INHERIT            0x4000
+#define AA_X_UNCONFINED         0x8000
+
+/* AA_SECURE_X_NEEDED - is passed in the bprm->unsafe field */
+#define AA_SECURE_X_NEEDED      0x8000
+
+/* need to make conditional which ones are being set */
+struct path_cond {
+        uid_t uid;
+        umode_t mode;
+};
+
+/* struct file_perms - file permission
+ * @allow: mask of permissions that are allowed
+ * @audit: mask of permissions to force an audit message for
+ * @quiet: mask of permissions to quiet audit messages for
+ * @kill: mask of permissions that when matched will kill the task
+ * @xindex: exec transition index if @allow contains MAY_EXEC
+ *
+ * The @audit and @queit mask should be mutually exclusive.
+ */
+struct file_perms {
+        u32 allow;
+        u32 audit;
+        u32 quiet;
+        u32 kill;
+        u16 xindex;
+};
+
+extern struct file_perms nullperms;
+
+#define COMBINED_PERM_MASK(X) ((X).allow | (X).audit | (X).quiet | (X).kill)
+
+/* FIXME: split perms from dfa and match this to description
+ *        also add delegation info.
+ */
+static inline u16 dfa_map_xindex(u16 mask)
+{
+        u16 old_index = (mask >> 10) & 0xf;
+        u16 index = 0;
+
+        if (mask & 0x100)
+                index |= AA_X_UNSAFE;
+        if (mask & 0x200)
+                index |= AA_X_INHERIT;
+        if (mask & 0x80)
+                index |= AA_X_UNCONFINED;
+
+        if (old_index == 1) {
+                index |= AA_X_UNCONFINED;
+        } else if (old_index == 2) {
+                index |= AA_X_NAME;
+        } else if (old_index == 3) {
+                index |= AA_X_NAME | AA_X_CHILD;
+        } else {
+                index |= AA_X_TABLE;
+                index |= old_index - 4;
+        }
+
+        return index;
+}
+
+/*
+ * map old dfa inline permissions to new format
+ */
+#define dfa_user_allow(dfa, state) (((ACCEPT_TABLE(dfa)[state]) & 0x7f) | \
+                                    ((ACCEPT_TABLE(dfa)[state]) & 0x80000000))
+#define dfa_user_audit(dfa, state) ((ACCEPT_TABLE2(dfa)[state]) & 0x7f)
+#define dfa_user_quiet(dfa, state) (((ACCEPT_TABLE2(dfa)[state]) >> 7) & 0x7f)
+#define dfa_user_xindex(dfa, state) \
+        (dfa_map_xindex(ACCEPT_TABLE(dfa)[state] & 0x3fff))
+
+#define dfa_other_allow(dfa, state) ((((ACCEPT_TABLE(dfa)[state]) >> 14) & \
+                                      0x7f) |                           \
+                                     ((ACCEPT_TABLE(dfa)[state]) & 0x80000000))
+#define dfa_other_audit(dfa, state) (((ACCEPT_TABLE2(dfa)[state]) >> 14) & 0x7f)
+#define dfa_other_quiet(dfa, state) \
+        ((((ACCEPT_TABLE2(dfa)[state]) >> 7) >> 14) & 0x7f)
+#define dfa_other_xindex(dfa, state) \
+        dfa_map_xindex((ACCEPT_TABLE(dfa)[state] >> 14) & 0x3fff)
+
+int aa_audit_file(struct aa_profile *profile, struct file_perms *perms,
+                  gfp_t gfp, int op, u32 request, const char *name,
+                  const char *target, uid_t ouid, const char *info, int error);
+
+/**
+ * struct aa_file_rules - components used for file rule permissions
+ * @dfa: dfa to match path names and conditionals against
+ * @perms: permission table indexed by the matched state accept entry of @dfa
+ * @trans: transition table for indexed by named x transitions
+ *
+ * File permission are determined by matching a path against @dfa and then
+ * then using the value of the accept entry for the matching state as
+ * an index into @perms.  If a named exec transition is required it is
+ * looked up in the transition table.
+ */
+struct aa_file_rules {
+        unsigned int start;
+        struct aa_dfa *dfa;
+        /* struct perms perms; */
+        struct aa_domain trans;
+        /* TODO: add delegate table */
+};
+
+unsigned int aa_str_perms(struct aa_dfa *dfa, unsigned int start,
+                          const char *name, struct path_cond *cond,
+                          struct file_perms *perms);
+
+int aa_path_perm(int op, struct aa_profile *profile, struct path *path,
+                 int flags, u32 request, struct path_cond *cond);
+
+int aa_path_link(struct aa_profile *profile, struct dentry *old_dentry,
+                 struct path *new_dir, struct dentry *new_dentry);
+
+int aa_file_perm(int op, struct aa_profile *profile, struct file *file,
+                 u32 request);
+
+static inline void aa_free_file_rules(struct aa_file_rules *rules)
+{
+        aa_put_dfa(rules->dfa);
+        aa_free_domain_entries(&rules->trans);
+}
+
+#define ACC_FMODE(x) (("\000\004\002\006"[(x)&O_ACCMODE]) | (((x) << 1) & 0x40))
+
+/* from namei.c */
+#define MAP_OPEN_FLAGS(x) ((((x) + 1) & O_ACCMODE) ? (x) + 1 : (x))
+
+/**
+ * aa_map_file_perms - map file flags to AppArmor permissions
+ * @file: open file to map flags to AppArmor permissions
+ *
+ * Returns: apparmor permission set for the file
+ */
+static inline u32 aa_map_file_to_perms(struct file *file)
+{
+        int flags = MAP_OPEN_FLAGS(file->f_flags);
+        u32 perms = ACC_FMODE(file->f_mode);
+
+        if ((flags & O_APPEND) && (perms & MAY_WRITE))
+                perms = (perms & ~MAY_WRITE) | MAY_APPEND;
+        /* trunc implies write permission */
+        if (flags & O_TRUNC)
+                perms |= MAY_WRITE;
+        if (flags & O_CREAT)
+                perms |= AA_MAY_CREATE;
+
+        return perms;
+}
+
+#endif /* __AA_FILE_H */