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apparmor: refactor path name lookup and permission checks around labels
Signed-off-by: John Johansen <john.johansen@canonical.com>
This commit is contained in:
John Johansen
parent
98c3d18232
commit
aebd873e8d
@ -152,6 +152,39 @@ int aa_audit_file(struct aa_profile *profile, struct aa_perms *perms,
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return aa_audit(type, profile, &sa, file_audit_cb);
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}
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/**
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* is_deleted - test if a file has been completely unlinked
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* @dentry: dentry of file to test for deletion (NOT NULL)
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*
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* Returns: %1 if deleted else %0
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*/
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static inline bool is_deleted(struct dentry *dentry)
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{
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if (d_unlinked(dentry) && d_backing_inode(dentry)->i_nlink == 0)
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return 1;
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return 0;
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}
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static int path_name(const char *op, struct aa_label *label,
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const struct path *path, int flags, char *buffer,
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const char **name, struct path_cond *cond, u32 request)
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{
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struct aa_profile *profile;
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const char *info = NULL;
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int error;
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error = aa_path_name(path, flags, buffer, name, &info,
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labels_profile(label)->disconnected);
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if (error) {
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fn_for_each_confined(label, profile,
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aa_audit_file(profile, &nullperms, op, request, *name,
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NULL, NULL, cond->uid, info, error));
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return error;
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}
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return 0;
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}
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/**
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* map_old_perms - map old file perms layout to the new layout
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* @old: permission set in old mapping
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@ -249,23 +282,46 @@ unsigned int aa_str_perms(struct aa_dfa *dfa, unsigned int start,
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return state;
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}
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/**
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* is_deleted - test if a file has been completely unlinked
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* @dentry: dentry of file to test for deletion (NOT NULL)
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*
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* Returns: %1 if deleted else %0
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*/
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static inline bool is_deleted(struct dentry *dentry)
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int __aa_path_perm(const char *op, struct aa_profile *profile, const char *name,
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u32 request, struct path_cond *cond, int flags,
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struct aa_perms *perms)
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{
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if (d_unlinked(dentry) && d_backing_inode(dentry)->i_nlink == 0)
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return 1;
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return 0;
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int e = 0;
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if (profile_unconfined(profile))
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return 0;
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aa_str_perms(profile->file.dfa, profile->file.start, name, cond, perms);
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if (request & ~perms->allow)
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e = -EACCES;
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return aa_audit_file(profile, perms, op, request, name, NULL, NULL,
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cond->uid, NULL, e);
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}
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static int profile_path_perm(const char *op, struct aa_profile *profile,
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const struct path *path, char *buffer, u32 request,
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struct path_cond *cond, int flags,
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struct aa_perms *perms)
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{
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const char *name;
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int error;
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if (profile_unconfined(profile))
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return 0;
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error = path_name(op, &profile->label, path,
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flags | profile->path_flags, buffer, &name, cond,
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request);
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if (error)
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return error;
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return __aa_path_perm(op, profile, name, request, cond, flags,
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perms);
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}
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/**
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* aa_path_perm - do permissions check & audit for @path
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* @op: operation being checked
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* @profile: profile being enforced (NOT NULL)
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* @label: profile being enforced (NOT NULL)
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* @path: path to check permissions of (NOT NULL)
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* @flags: any additional path flags beyond what the profile specifies
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* @request: requested permissions
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@ -273,36 +329,22 @@ static inline bool is_deleted(struct dentry *dentry)
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*
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* Returns: %0 else error if access denied or other error
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*/
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int aa_path_perm(const char *op, struct aa_profile *profile,
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int aa_path_perm(const char *op, struct aa_label *label,
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const struct path *path, int flags, u32 request,
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struct path_cond *cond)
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{
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char *buffer = NULL;
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struct aa_perms perms = {};
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const char *name, *info = NULL;
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struct aa_profile *profile;
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char *buffer = NULL;
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int error;
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flags |= profile->path_flags | (S_ISDIR(cond->mode) ? PATH_IS_DIR : 0);
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flags |= PATH_DELEGATE_DELETED | (S_ISDIR(cond->mode) ? PATH_IS_DIR :
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0);
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get_buffers(buffer);
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error = aa_path_name(path, flags, buffer, &name, &info,
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profile->disconnected);
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if (error) {
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if (error == -ENOENT && is_deleted(path->dentry)) {
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/* Access to open files that are deleted are
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* give a pass (implicit delegation)
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*/
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error = 0;
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info = NULL;
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perms.allow = request;
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}
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} else {
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aa_str_perms(profile->file.dfa, profile->file.start, name, cond,
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&perms);
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if (request & ~perms.allow)
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error = -EACCES;
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}
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error = aa_audit_file(profile, &perms, op, request, name, NULL, NULL,
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cond->uid, info, error);
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error = fn_for_each_confined(label, profile,
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profile_path_perm(op, profile, path, buffer, request,
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cond, flags, &perms));
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put_buffers(buffer);
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return error;
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@ -482,7 +524,7 @@ int aa_file_perm(const char *op, struct aa_label *label, struct file *file,
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/* TODO: label cross check */
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if (file->f_path.mnt && path_mediated_fs(file->f_path.dentry))
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error = aa_path_perm(op, labels_profile(label), &file->f_path,
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error = aa_path_perm(op, label, &file->f_path,
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PATH_DELEGATE_DELETED, request, &cond);
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done:
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@ -190,7 +190,10 @@ unsigned int aa_str_perms(struct aa_dfa *dfa, unsigned int start,
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const char *name, struct path_cond *cond,
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struct aa_perms *perms);
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int aa_path_perm(const char *op, struct aa_profile *profile,
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int __aa_path_perm(const char *op, struct aa_profile *profile,
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const char *name, u32 request, struct path_cond *cond,
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int flags, struct aa_perms *perms);
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int aa_path_perm(const char *op, struct aa_label *label,
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const struct path *path, int flags, u32 request,
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struct path_cond *cond);
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@ -196,8 +196,7 @@ static int common_perm(const char *op, const struct path *path, u32 mask,
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label = __begin_current_label_crit_section();
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if (!unconfined(label))
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error = aa_path_perm(op, labels_profile(label), path, 0, mask,
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cond);
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error = aa_path_perm(op, label, path, 0, mask, cond);
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__end_current_label_crit_section(label);
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return error;
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@ -359,15 +358,12 @@ static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_d
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d_backing_inode(old_dentry)->i_mode
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};
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error = aa_path_perm(OP_RENAME_SRC, labels_profile(label),
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&old_path, 0,
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error = aa_path_perm(OP_RENAME_SRC, label, &old_path, 0,
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MAY_READ | AA_MAY_GETATTR | MAY_WRITE |
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AA_MAY_SETATTR | AA_MAY_DELETE,
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&cond);
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if (!error)
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error = aa_path_perm(OP_RENAME_DEST,
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labels_profile(label),
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&new_path,
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error = aa_path_perm(OP_RENAME_DEST, label, &new_path,
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0, MAY_WRITE | AA_MAY_SETATTR |
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AA_MAY_CREATE, &cond);
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@ -416,8 +412,7 @@ static int apparmor_file_open(struct file *file, const struct cred *cred)
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struct inode *inode = file_inode(file);
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struct path_cond cond = { inode->i_uid, inode->i_mode };
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error = aa_path_perm(OP_OPEN, labels_profile(label),
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&file->f_path, 0,
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error = aa_path_perm(OP_OPEN, label, &file->f_path, 0,
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aa_map_file_to_perms(file), &cond);
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/* todo cache full allowed permissions set and state */
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fctx->allow = aa_map_file_to_perms(file);
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