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![Atte Heikkilä](/assets/img/avatar_default.png)
Share config response may contain the share name without casefolding as it is known to the user space daemon. When it is present, casefold and compare it to the share name the share config request was made with. If they differ, we have a share config which is incompatible with the way share config caching is done. This is the case when CONFIG_UNICODE is not set, the share name contains non-ASCII characters, and those non- ASCII characters do not match those in the share name known to user space. In other words, when CONFIG_UNICODE is not set, UTF-8 share names now work but are only case-insensitive in the ASCII range. Signed-off-by: Atte Heikkilä <atteh.mailbox@gmail.com> Acked-by: Tom Talpey <tom@talpey.com> Acked-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com>
381 lines
7.9 KiB
C
381 lines
7.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
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* Copyright (C) 2018 Samsung Electronics Co., Ltd.
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*/
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#include <linux/kernel.h>
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#include <linux/xattr.h>
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#include <linux/fs.h>
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#include <linux/unicode.h>
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#include "misc.h"
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#include "smb_common.h"
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#include "connection.h"
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#include "vfs.h"
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#include "mgmt/share_config.h"
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/**
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* match_pattern() - compare a string with a pattern which might include
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* wildcard '*' and '?'
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* TODO : implement consideration about DOS_DOT, DOS_QM and DOS_STAR
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*
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* @str: string to compare with a pattern
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* @len: string length
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* @pattern: pattern string which might include wildcard '*' and '?'
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*
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* Return: 0 if pattern matched with the string, otherwise non zero value
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*/
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int match_pattern(const char *str, size_t len, const char *pattern)
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{
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const char *s = str;
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const char *p = pattern;
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bool star = false;
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while (*s && len) {
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switch (*p) {
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case '?':
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s++;
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len--;
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p++;
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break;
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case '*':
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star = true;
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str = s;
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if (!*++p)
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return true;
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pattern = p;
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break;
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default:
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if (tolower(*s) == tolower(*p)) {
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s++;
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len--;
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p++;
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} else {
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if (!star)
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return false;
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str++;
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s = str;
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p = pattern;
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}
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break;
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}
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}
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if (*p == '*')
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++p;
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return !*p;
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}
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/*
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* is_char_allowed() - check for valid character
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* @ch: input character to be checked
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*
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* Return: 1 if char is allowed, otherwise 0
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*/
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static inline int is_char_allowed(char ch)
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{
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/* check for control chars, wildcards etc. */
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if (!(ch & 0x80) &&
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(ch <= 0x1f ||
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ch == '?' || ch == '"' || ch == '<' ||
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ch == '>' || ch == '|' || ch == '*'))
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return 0;
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return 1;
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}
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int ksmbd_validate_filename(char *filename)
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{
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while (*filename) {
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char c = *filename;
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filename++;
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if (!is_char_allowed(c)) {
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ksmbd_debug(VFS, "File name validation failed: 0x%x\n", c);
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return -ENOENT;
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}
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}
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return 0;
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}
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static int ksmbd_validate_stream_name(char *stream_name)
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{
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while (*stream_name) {
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char c = *stream_name;
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stream_name++;
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if (c == '/' || c == ':' || c == '\\') {
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pr_err("Stream name validation failed: %c\n", c);
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return -ENOENT;
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}
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}
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return 0;
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}
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int parse_stream_name(char *filename, char **stream_name, int *s_type)
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{
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char *stream_type;
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char *s_name;
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int rc = 0;
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s_name = filename;
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filename = strsep(&s_name, ":");
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ksmbd_debug(SMB, "filename : %s, streams : %s\n", filename, s_name);
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if (strchr(s_name, ':')) {
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stream_type = s_name;
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s_name = strsep(&stream_type, ":");
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rc = ksmbd_validate_stream_name(s_name);
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if (rc < 0) {
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rc = -ENOENT;
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goto out;
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}
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ksmbd_debug(SMB, "stream name : %s, stream type : %s\n", s_name,
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stream_type);
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if (!strncasecmp("$data", stream_type, 5))
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*s_type = DATA_STREAM;
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else if (!strncasecmp("$index_allocation", stream_type, 17))
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*s_type = DIR_STREAM;
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else
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rc = -ENOENT;
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}
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*stream_name = s_name;
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out:
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return rc;
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}
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/**
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* convert_to_nt_pathname() - extract and return windows path string
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* whose share directory prefix was removed from file path
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* @share: ksmbd_share_config pointer
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* @path: path to report
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*
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* Return : windows path string or error
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*/
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char *convert_to_nt_pathname(struct ksmbd_share_config *share,
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const struct path *path)
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{
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char *pathname, *ab_pathname, *nt_pathname;
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int share_path_len = share->path_sz;
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pathname = kmalloc(PATH_MAX, GFP_KERNEL);
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if (!pathname)
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return ERR_PTR(-EACCES);
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ab_pathname = d_path(path, pathname, PATH_MAX);
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if (IS_ERR(ab_pathname)) {
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nt_pathname = ERR_PTR(-EACCES);
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goto free_pathname;
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}
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if (strncmp(ab_pathname, share->path, share_path_len)) {
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nt_pathname = ERR_PTR(-EACCES);
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goto free_pathname;
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}
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nt_pathname = kzalloc(strlen(&ab_pathname[share_path_len]) + 2, GFP_KERNEL);
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if (!nt_pathname) {
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nt_pathname = ERR_PTR(-ENOMEM);
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goto free_pathname;
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}
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if (ab_pathname[share_path_len] == '\0')
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strcpy(nt_pathname, "/");
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strcat(nt_pathname, &ab_pathname[share_path_len]);
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ksmbd_conv_path_to_windows(nt_pathname);
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free_pathname:
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kfree(pathname);
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return nt_pathname;
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}
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int get_nlink(struct kstat *st)
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{
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int nlink;
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nlink = st->nlink;
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if (S_ISDIR(st->mode))
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nlink--;
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return nlink;
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}
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void ksmbd_conv_path_to_unix(char *path)
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{
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strreplace(path, '\\', '/');
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}
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void ksmbd_strip_last_slash(char *path)
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{
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int len = strlen(path);
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while (len && path[len - 1] == '/') {
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path[len - 1] = '\0';
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len--;
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}
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}
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void ksmbd_conv_path_to_windows(char *path)
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{
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strreplace(path, '/', '\\');
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}
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char *ksmbd_casefold_sharename(struct unicode_map *um, const char *name)
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{
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char *cf_name;
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int cf_len;
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cf_name = kzalloc(KSMBD_REQ_MAX_SHARE_NAME, GFP_KERNEL);
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if (!cf_name)
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return ERR_PTR(-ENOMEM);
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if (IS_ENABLED(CONFIG_UNICODE) && um) {
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const struct qstr q_name = {.name = name, .len = strlen(name)};
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cf_len = utf8_casefold(um, &q_name, cf_name,
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KSMBD_REQ_MAX_SHARE_NAME);
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if (cf_len < 0)
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goto out_ascii;
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return cf_name;
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}
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out_ascii:
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cf_len = strscpy(cf_name, name, KSMBD_REQ_MAX_SHARE_NAME);
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if (cf_len < 0) {
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kfree(cf_name);
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return ERR_PTR(-E2BIG);
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}
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for (; *cf_name; ++cf_name)
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*cf_name = isascii(*cf_name) ? tolower(*cf_name) : *cf_name;
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return cf_name - cf_len;
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}
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/**
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* ksmbd_extract_sharename() - get share name from tree connect request
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* @treename: buffer containing tree name and share name
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*
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* Return: share name on success, otherwise error
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*/
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char *ksmbd_extract_sharename(struct unicode_map *um, const char *treename)
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{
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const char *name = treename, *pos = strrchr(name, '\\');
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if (pos)
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name = (pos + 1);
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/* caller has to free the memory */
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return ksmbd_casefold_sharename(um, name);
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}
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/**
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* convert_to_unix_name() - convert windows name to unix format
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* @share: ksmbd_share_config pointer
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* @name: file name that is relative to share
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*
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* Return: converted name on success, otherwise NULL
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*/
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char *convert_to_unix_name(struct ksmbd_share_config *share, const char *name)
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{
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int no_slash = 0, name_len, path_len;
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char *new_name;
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if (name[0] == '/')
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name++;
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path_len = share->path_sz;
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name_len = strlen(name);
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new_name = kmalloc(path_len + name_len + 2, GFP_KERNEL);
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if (!new_name)
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return new_name;
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memcpy(new_name, share->path, path_len);
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if (new_name[path_len - 1] != '/') {
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new_name[path_len] = '/';
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no_slash = 1;
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}
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memcpy(new_name + path_len + no_slash, name, name_len);
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path_len += name_len + no_slash;
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new_name[path_len] = 0x00;
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return new_name;
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}
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char *ksmbd_convert_dir_info_name(struct ksmbd_dir_info *d_info,
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const struct nls_table *local_nls,
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int *conv_len)
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{
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char *conv;
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int sz = min(4 * d_info->name_len, PATH_MAX);
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if (!sz)
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return NULL;
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conv = kmalloc(sz, GFP_KERNEL);
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if (!conv)
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return NULL;
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/* XXX */
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*conv_len = smbConvertToUTF16((__le16 *)conv, d_info->name,
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d_info->name_len, local_nls, 0);
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*conv_len *= 2;
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/* We allocate buffer twice bigger than needed. */
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conv[*conv_len] = 0x00;
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conv[*conv_len + 1] = 0x00;
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return conv;
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}
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/*
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* Convert the NT UTC (based 1601-01-01, in hundred nanosecond units)
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* into Unix UTC (based 1970-01-01, in seconds).
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*/
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struct timespec64 ksmbd_NTtimeToUnix(__le64 ntutc)
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{
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struct timespec64 ts;
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/* Subtract the NTFS time offset, then convert to 1s intervals. */
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s64 t = le64_to_cpu(ntutc) - NTFS_TIME_OFFSET;
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u64 abs_t;
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/*
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* Unfortunately can not use normal 64 bit division on 32 bit arch, but
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* the alternative, do_div, does not work with negative numbers so have
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* to special case them
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*/
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if (t < 0) {
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abs_t = -t;
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ts.tv_nsec = do_div(abs_t, 10000000) * 100;
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ts.tv_nsec = -ts.tv_nsec;
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ts.tv_sec = -abs_t;
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} else {
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abs_t = t;
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ts.tv_nsec = do_div(abs_t, 10000000) * 100;
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ts.tv_sec = abs_t;
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}
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return ts;
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}
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/* Convert the Unix UTC into NT UTC. */
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inline u64 ksmbd_UnixTimeToNT(struct timespec64 t)
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{
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/* Convert to 100ns intervals and then add the NTFS time offset. */
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return (u64)t.tv_sec * 10000000 + t.tv_nsec / 100 + NTFS_TIME_OFFSET;
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}
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inline long long ksmbd_systime(void)
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{
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struct timespec64 ts;
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ktime_get_real_ts64(&ts);
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return ksmbd_UnixTimeToNT(ts);
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}
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