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-rw-r--r--fs/smb/server/misc.c381
1 files changed, 381 insertions, 0 deletions
diff --git a/fs/smb/server/misc.c b/fs/smb/server/misc.c
new file mode 100644
index 000000000000..9e8afaa686e3
--- /dev/null
+++ b/fs/smb/server/misc.c
@@ -0,0 +1,381 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
+ * Copyright (C) 2018 Samsung Electronics Co., Ltd.
+ */
+
+#include <linux/kernel.h>
+#include <linux/xattr.h>
+#include <linux/fs.h>
+#include <linux/unicode.h>
+
+#include "misc.h"
+#include "smb_common.h"
+#include "connection.h"
+#include "vfs.h"
+
+#include "mgmt/share_config.h"
+
+/**
+ * match_pattern() - compare a string with a pattern which might include
+ * wildcard '*' and '?'
+ * TODO : implement consideration about DOS_DOT, DOS_QM and DOS_STAR
+ *
+ * @str: string to compare with a pattern
+ * @len: string length
+ * @pattern: pattern string which might include wildcard '*' and '?'
+ *
+ * Return: 0 if pattern matched with the string, otherwise non zero value
+ */
+int match_pattern(const char *str, size_t len, const char *pattern)
+{
+ const char *s = str;
+ const char *p = pattern;
+ bool star = false;
+
+ while (*s && len) {
+ switch (*p) {
+ case '?':
+ s++;
+ len--;
+ p++;
+ break;
+ case '*':
+ star = true;
+ str = s;
+ if (!*++p)
+ return true;
+ pattern = p;
+ break;
+ default:
+ if (tolower(*s) == tolower(*p)) {
+ s++;
+ len--;
+ p++;
+ } else {
+ if (!star)
+ return false;
+ str++;
+ s = str;
+ p = pattern;
+ }
+ break;
+ }
+ }
+
+ if (*p == '*')
+ ++p;
+ return !*p;
+}
+
+/*
+ * is_char_allowed() - check for valid character
+ * @ch: input character to be checked
+ *
+ * Return: 1 if char is allowed, otherwise 0
+ */
+static inline int is_char_allowed(char ch)
+{
+ /* check for control chars, wildcards etc. */
+ if (!(ch & 0x80) &&
+ (ch <= 0x1f ||
+ ch == '?' || ch == '"' || ch == '<' ||
+ ch == '>' || ch == '|' || ch == '*'))
+ return 0;
+
+ return 1;
+}
+
+int ksmbd_validate_filename(char *filename)
+{
+ while (*filename) {
+ char c = *filename;
+
+ filename++;
+ if (!is_char_allowed(c)) {
+ ksmbd_debug(VFS, "File name validation failed: 0x%x\n", c);
+ return -ENOENT;
+ }
+ }
+
+ return 0;
+}
+
+static int ksmbd_validate_stream_name(char *stream_name)
+{
+ while (*stream_name) {
+ char c = *stream_name;
+
+ stream_name++;
+ if (c == '/' || c == ':' || c == '\\') {
+ pr_err("Stream name validation failed: %c\n", c);
+ return -ENOENT;
+ }
+ }
+
+ return 0;
+}
+
+int parse_stream_name(char *filename, char **stream_name, int *s_type)
+{
+ char *stream_type;
+ char *s_name;
+ int rc = 0;
+
+ s_name = filename;
+ filename = strsep(&s_name, ":");
+ ksmbd_debug(SMB, "filename : %s, streams : %s\n", filename, s_name);
+ if (strchr(s_name, ':')) {
+ stream_type = s_name;
+ s_name = strsep(&stream_type, ":");
+
+ rc = ksmbd_validate_stream_name(s_name);
+ if (rc < 0) {
+ rc = -ENOENT;
+ goto out;
+ }
+
+ ksmbd_debug(SMB, "stream name : %s, stream type : %s\n", s_name,
+ stream_type);
+ if (!strncasecmp("$data", stream_type, 5))
+ *s_type = DATA_STREAM;
+ else if (!strncasecmp("$index_allocation", stream_type, 17))
+ *s_type = DIR_STREAM;
+ else
+ rc = -ENOENT;
+ }
+
+ *stream_name = s_name;
+out:
+ return rc;
+}
+
+/**
+ * convert_to_nt_pathname() - extract and return windows path string
+ * whose share directory prefix was removed from file path
+ * @share: ksmbd_share_config pointer
+ * @path: path to report
+ *
+ * Return : windows path string or error
+ */
+
+char *convert_to_nt_pathname(struct ksmbd_share_config *share,
+ const struct path *path)
+{
+ char *pathname, *ab_pathname, *nt_pathname;
+ int share_path_len = share->path_sz;
+
+ pathname = kmalloc(PATH_MAX, GFP_KERNEL);
+ if (!pathname)
+ return ERR_PTR(-EACCES);
+
+ ab_pathname = d_path(path, pathname, PATH_MAX);
+ if (IS_ERR(ab_pathname)) {
+ nt_pathname = ERR_PTR(-EACCES);
+ goto free_pathname;
+ }
+
+ if (strncmp(ab_pathname, share->path, share_path_len)) {
+ nt_pathname = ERR_PTR(-EACCES);
+ goto free_pathname;
+ }
+
+ nt_pathname = kzalloc(strlen(&ab_pathname[share_path_len]) + 2, GFP_KERNEL);
+ if (!nt_pathname) {
+ nt_pathname = ERR_PTR(-ENOMEM);
+ goto free_pathname;
+ }
+ if (ab_pathname[share_path_len] == '\0')
+ strcpy(nt_pathname, "/");
+ strcat(nt_pathname, &ab_pathname[share_path_len]);
+
+ ksmbd_conv_path_to_windows(nt_pathname);
+
+free_pathname:
+ kfree(pathname);
+ return nt_pathname;
+}
+
+int get_nlink(struct kstat *st)
+{
+ int nlink;
+
+ nlink = st->nlink;
+ if (S_ISDIR(st->mode))
+ nlink--;
+
+ return nlink;
+}
+
+void ksmbd_conv_path_to_unix(char *path)
+{
+ strreplace(path, '\\', '/');
+}
+
+void ksmbd_strip_last_slash(char *path)
+{
+ int len = strlen(path);
+
+ while (len && path[len - 1] == '/') {
+ path[len - 1] = '\0';
+ len--;
+ }
+}
+
+void ksmbd_conv_path_to_windows(char *path)
+{
+ strreplace(path, '/', '\\');
+}
+
+char *ksmbd_casefold_sharename(struct unicode_map *um, const char *name)
+{
+ char *cf_name;
+ int cf_len;
+
+ cf_name = kzalloc(KSMBD_REQ_MAX_SHARE_NAME, GFP_KERNEL);
+ if (!cf_name)
+ return ERR_PTR(-ENOMEM);
+
+ if (IS_ENABLED(CONFIG_UNICODE) && um) {
+ const struct qstr q_name = {.name = name, .len = strlen(name)};
+
+ cf_len = utf8_casefold(um, &q_name, cf_name,
+ KSMBD_REQ_MAX_SHARE_NAME);
+ if (cf_len < 0)
+ goto out_ascii;
+
+ return cf_name;
+ }
+
+out_ascii:
+ cf_len = strscpy(cf_name, name, KSMBD_REQ_MAX_SHARE_NAME);
+ if (cf_len < 0) {
+ kfree(cf_name);
+ return ERR_PTR(-E2BIG);
+ }
+
+ for (; *cf_name; ++cf_name)
+ *cf_name = isascii(*cf_name) ? tolower(*cf_name) : *cf_name;
+ return cf_name - cf_len;
+}
+
+/**
+ * ksmbd_extract_sharename() - get share name from tree connect request
+ * @treename: buffer containing tree name and share name
+ *
+ * Return: share name on success, otherwise error
+ */
+char *ksmbd_extract_sharename(struct unicode_map *um, const char *treename)
+{
+ const char *name = treename, *pos = strrchr(name, '\\');
+
+ if (pos)
+ name = (pos + 1);
+
+ /* caller has to free the memory */
+ return ksmbd_casefold_sharename(um, name);
+}
+
+/**
+ * convert_to_unix_name() - convert windows name to unix format
+ * @share: ksmbd_share_config pointer
+ * @name: file name that is relative to share
+ *
+ * Return: converted name on success, otherwise NULL
+ */
+char *convert_to_unix_name(struct ksmbd_share_config *share, const char *name)
+{
+ int no_slash = 0, name_len, path_len;
+ char *new_name;
+
+ if (name[0] == '/')
+ name++;
+
+ path_len = share->path_sz;
+ name_len = strlen(name);
+ new_name = kmalloc(path_len + name_len + 2, GFP_KERNEL);
+ if (!new_name)
+ return new_name;
+
+ memcpy(new_name, share->path, path_len);
+ if (new_name[path_len - 1] != '/') {
+ new_name[path_len] = '/';
+ no_slash = 1;
+ }
+
+ memcpy(new_name + path_len + no_slash, name, name_len);
+ path_len += name_len + no_slash;
+ new_name[path_len] = 0x00;
+ return new_name;
+}
+
+char *ksmbd_convert_dir_info_name(struct ksmbd_dir_info *d_info,
+ const struct nls_table *local_nls,
+ int *conv_len)
+{
+ char *conv;
+ int sz = min(4 * d_info->name_len, PATH_MAX);
+
+ if (!sz)
+ return NULL;
+
+ conv = kmalloc(sz, GFP_KERNEL);
+ if (!conv)
+ return NULL;
+
+ /* XXX */
+ *conv_len = smbConvertToUTF16((__le16 *)conv, d_info->name,
+ d_info->name_len, local_nls, 0);
+ *conv_len *= 2;
+
+ /* We allocate buffer twice bigger than needed. */
+ conv[*conv_len] = 0x00;
+ conv[*conv_len + 1] = 0x00;
+ return conv;
+}
+
+/*
+ * Convert the NT UTC (based 1601-01-01, in hundred nanosecond units)
+ * into Unix UTC (based 1970-01-01, in seconds).
+ */
+struct timespec64 ksmbd_NTtimeToUnix(__le64 ntutc)
+{
+ struct timespec64 ts;
+
+ /* Subtract the NTFS time offset, then convert to 1s intervals. */
+ s64 t = le64_to_cpu(ntutc) - NTFS_TIME_OFFSET;
+ u64 abs_t;
+
+ /*
+ * Unfortunately can not use normal 64 bit division on 32 bit arch, but
+ * the alternative, do_div, does not work with negative numbers so have
+ * to special case them
+ */
+ if (t < 0) {
+ abs_t = -t;
+ ts.tv_nsec = do_div(abs_t, 10000000) * 100;
+ ts.tv_nsec = -ts.tv_nsec;
+ ts.tv_sec = -abs_t;
+ } else {
+ abs_t = t;
+ ts.tv_nsec = do_div(abs_t, 10000000) * 100;
+ ts.tv_sec = abs_t;
+ }
+
+ return ts;
+}
+
+/* Convert the Unix UTC into NT UTC. */
+inline u64 ksmbd_UnixTimeToNT(struct timespec64 t)
+{
+ /* Convert to 100ns intervals and then add the NTFS time offset. */
+ return (u64)t.tv_sec * 10000000 + t.tv_nsec / 100 + NTFS_TIME_OFFSET;
+}
+
+inline long long ksmbd_systime(void)
+{
+ struct timespec64 ts;
+
+ ktime_get_real_ts64(&ts);
+ return ksmbd_UnixTimeToNT(ts);
+}