cifsd: add server-side procedures for SMB3

This adds smb3 engine, NTLM/NTLMv2/Kerberos authentication, oplock/lease
cache mechanism for cifsd.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com>
Acked-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

1 files changed, 293 insertions, 0 deletions

diff --git a/fs/cifsd/misc.c b/fs/cifsd/misc.c
new file mode 100644
index 000000000000..9e689c33f7bb
--- /dev/null
+++ b/fs/cifsd/misc.c
@@ -0,0 +1,293 @@
+// 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/version.h>
+#include <linux/xattr.h>
+#include <linux/fs.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
+ *
+ * @string:	string to compare with a pattern
+ * @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, const char *pattern)
+{
+	const char *s = str;
+	const char *p = pattern;
+	bool star = false;
+
+	while (*s) {
+		switch (*p) {
+		case '?':
+			s++;
+			p++;
+			break;
+		case '*':
+			star = true;
+			str = s;
+			if (!*++p)
+				return true;
+			pattern = p;
+			break;
+		default:
+			if (tolower(*s) == tolower(*p)) {
+				s++;
+				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 == '\\') {
+			ksmbd_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
+ * @filename : unix filename
+ * @sharepath: share path string
+ *
+ * Return : windows path string or error
+ */
+
+char *convert_to_nt_pathname(char *filename, char *sharepath)
+{
+	char *ab_pathname;
+	int len, name_len;
+
+	name_len = strlen(filename);
+	ab_pathname = kmalloc(name_len, GFP_KERNEL);
+	if (!ab_pathname)
+		return NULL;
+
+	ab_pathname[0] = '\\';
+	ab_pathname[1] = '\0';
+
+	len = strlen(sharepath);
+	if (!strncmp(filename, sharepath, len) && name_len != len) {
+		strscpy(ab_pathname, &filename[len], name_len);
+		ksmbd_conv_path_to_windows(ab_pathname);
+	}
+
+	return ab_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, '/', '\\');
+}
+
+/**
+ * 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 *extract_sharename(char *treename)
+{
+	char *name = treename;
+	char *dst;
+	char *pos = strrchr(name, '\\');
+
+	if (pos)
+		name = (pos + 1);
+
+	/* caller has to free the memory */
+	dst = kstrdup(name, GFP_KERNEL);
+	if (!dst)
+		return ERR_PTR(-ENOMEM);
+	return dst;
+}
+
+/**
+ * convert_to_unix_name() - convert windows name to unix format
+ * @path:	name to be converted
+ * @tid:	tree id of mathing share
+ *
+ * Return:	converted name on success, otherwise NULL
+ */
+char *convert_to_unix_name(struct ksmbd_share_config *share, 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;
+}