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-rw-r--r--fs/ksmbd/ndr.c348
1 files changed, 348 insertions, 0 deletions
diff --git a/fs/ksmbd/ndr.c b/fs/ksmbd/ndr.c
new file mode 100644
index 000000000000..46cc01475d38
--- /dev/null
+++ b/fs/ksmbd/ndr.c
@@ -0,0 +1,348 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2021 Samsung Electronics Co., Ltd.
+ * Author(s): Namjae Jeon <linkinjeon@kernel.org>
+ */
+
+#include <linux/fs.h>
+
+#include "glob.h"
+#include "ndr.h"
+
+#define PAYLOAD_HEAD(d) ((d)->data + (d)->offset)
+
+#define KSMBD_ALIGN_MASK(x, mask) (((x) + (mask)) & ~(mask))
+
+#define KSMBD_ALIGN(x, a) \
+ ({ \
+ typeof(x) ret = (x); \
+ if (((x) & ((typeof(x))(a) - 1)) != 0) \
+ ret = KSMBD_ALIGN_MASK(x, (typeof(x))(a) - 1); \
+ ret; \
+ })
+
+static void align_offset(struct ndr *ndr, int n)
+{
+ ndr->offset = KSMBD_ALIGN(ndr->offset, n);
+}
+
+static int try_to_realloc_ndr_blob(struct ndr *n, size_t sz)
+{
+ char *data;
+
+ data = krealloc(n->data, n->offset + sz + 1024, GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ n->data = data;
+ n->length += 1024;
+ memset(n->data + n->offset, 0, 1024);
+ return 0;
+}
+
+static void ndr_write_int16(struct ndr *n, __u16 value)
+{
+ if (n->length <= n->offset + sizeof(value))
+ try_to_realloc_ndr_blob(n, sizeof(value));
+
+ *(__le16 *)PAYLOAD_HEAD(n) = cpu_to_le16(value);
+ n->offset += sizeof(value);
+}
+
+static void ndr_write_int32(struct ndr *n, __u32 value)
+{
+ if (n->length <= n->offset + sizeof(value))
+ try_to_realloc_ndr_blob(n, sizeof(value));
+
+ *(__le32 *)PAYLOAD_HEAD(n) = cpu_to_le32(value);
+ n->offset += sizeof(value);
+}
+
+static void ndr_write_int64(struct ndr *n, __u64 value)
+{
+ if (n->length <= n->offset + sizeof(value))
+ try_to_realloc_ndr_blob(n, sizeof(value));
+
+ *(__le64 *)PAYLOAD_HEAD(n) = cpu_to_le64(value);
+ n->offset += sizeof(value);
+}
+
+static int ndr_write_bytes(struct ndr *n, void *value, size_t sz)
+{
+ if (n->length <= n->offset + sz)
+ try_to_realloc_ndr_blob(n, sz);
+
+ memcpy(PAYLOAD_HEAD(n), value, sz);
+ n->offset += sz;
+ return 0;
+}
+
+static int ndr_write_string(struct ndr *n, void *value, size_t sz)
+{
+ if (n->length <= n->offset + sz)
+ try_to_realloc_ndr_blob(n, sz);
+
+ strncpy(PAYLOAD_HEAD(n), value, sz);
+ sz++;
+ n->offset += sz;
+ align_offset(n, 2);
+ return 0;
+}
+
+static int ndr_read_string(struct ndr *n, void *value, size_t sz)
+{
+ int len = strnlen(PAYLOAD_HEAD(n), sz);
+
+ memcpy(value, PAYLOAD_HEAD(n), len);
+ len++;
+ n->offset += len;
+ align_offset(n, 2);
+ return 0;
+}
+
+static int ndr_read_bytes(struct ndr *n, void *value, size_t sz)
+{
+ memcpy(value, PAYLOAD_HEAD(n), sz);
+ n->offset += sz;
+ return 0;
+}
+
+static __u16 ndr_read_int16(struct ndr *n)
+{
+ __u16 ret;
+
+ ret = le16_to_cpu(*(__le16 *)PAYLOAD_HEAD(n));
+ n->offset += sizeof(__u16);
+ return ret;
+}
+
+static __u32 ndr_read_int32(struct ndr *n)
+{
+ __u32 ret;
+
+ ret = le32_to_cpu(*(__le32 *)PAYLOAD_HEAD(n));
+ n->offset += sizeof(__u32);
+ return ret;
+}
+
+static __u64 ndr_read_int64(struct ndr *n)
+{
+ __u64 ret;
+
+ ret = le64_to_cpu(*(__le64 *)PAYLOAD_HEAD(n));
+ n->offset += sizeof(__u64);
+ return ret;
+}
+
+int ndr_encode_dos_attr(struct ndr *n, struct xattr_dos_attrib *da)
+{
+ char hex_attr[12] = {0};
+
+ n->offset = 0;
+ n->length = 1024;
+ n->data = kzalloc(n->length, GFP_KERNEL);
+ if (!n->data)
+ return -ENOMEM;
+
+ if (da->version == 3) {
+ snprintf(hex_attr, 10, "0x%x", da->attr);
+ ndr_write_string(n, hex_attr, strlen(hex_attr));
+ } else {
+ ndr_write_string(n, "", strlen(""));
+ }
+ ndr_write_int16(n, da->version);
+ ndr_write_int32(n, da->version);
+
+ ndr_write_int32(n, da->flags);
+ ndr_write_int32(n, da->attr);
+ if (da->version == 3) {
+ ndr_write_int32(n, da->ea_size);
+ ndr_write_int64(n, da->size);
+ ndr_write_int64(n, da->alloc_size);
+ } else {
+ ndr_write_int64(n, da->itime);
+ }
+ ndr_write_int64(n, da->create_time);
+ if (da->version == 3)
+ ndr_write_int64(n, da->change_time);
+ return 0;
+}
+
+int ndr_decode_dos_attr(struct ndr *n, struct xattr_dos_attrib *da)
+{
+ char hex_attr[12] = {0};
+ int version2;
+
+ n->offset = 0;
+ ndr_read_string(n, hex_attr, n->length - n->offset);
+ da->version = ndr_read_int16(n);
+
+ if (da->version != 3 && da->version != 4) {
+ pr_err("v%d version is not supported\n", da->version);
+ return -EINVAL;
+ }
+
+ version2 = ndr_read_int32(n);
+ if (da->version != version2) {
+ pr_err("ndr version mismatched(version: %d, version2: %d)\n",
+ da->version, version2);
+ return -EINVAL;
+ }
+
+ ndr_read_int32(n);
+ da->attr = ndr_read_int32(n);
+ if (da->version == 4) {
+ da->itime = ndr_read_int64(n);
+ da->create_time = ndr_read_int64(n);
+ } else {
+ ndr_read_int32(n);
+ ndr_read_int64(n);
+ ndr_read_int64(n);
+ da->create_time = ndr_read_int64(n);
+ ndr_read_int64(n);
+ }
+
+ return 0;
+}
+
+static int ndr_encode_posix_acl_entry(struct ndr *n, struct xattr_smb_acl *acl)
+{
+ int i;
+
+ ndr_write_int32(n, acl->count);
+ align_offset(n, 8);
+ ndr_write_int32(n, acl->count);
+ ndr_write_int32(n, 0);
+
+ for (i = 0; i < acl->count; i++) {
+ align_offset(n, 8);
+ ndr_write_int16(n, acl->entries[i].type);
+ ndr_write_int16(n, acl->entries[i].type);
+
+ if (acl->entries[i].type == SMB_ACL_USER) {
+ align_offset(n, 8);
+ ndr_write_int64(n, acl->entries[i].uid);
+ } else if (acl->entries[i].type == SMB_ACL_GROUP) {
+ align_offset(n, 8);
+ ndr_write_int64(n, acl->entries[i].gid);
+ }
+
+ /* push permission */
+ ndr_write_int32(n, acl->entries[i].perm);
+ }
+
+ return 0;
+}
+
+int ndr_encode_posix_acl(struct ndr *n, struct inode *inode,
+ struct xattr_smb_acl *acl,
+ struct xattr_smb_acl *def_acl)
+{
+ int ref_id = 0x00020000;
+
+ n->offset = 0;
+ n->length = 1024;
+ n->data = kzalloc(n->length, GFP_KERNEL);
+ if (!n->data)
+ return -ENOMEM;
+
+ if (acl) {
+ /* ACL ACCESS */
+ ndr_write_int32(n, ref_id);
+ ref_id += 4;
+ } else {
+ ndr_write_int32(n, 0);
+ }
+
+ if (def_acl) {
+ /* DEFAULT ACL ACCESS */
+ ndr_write_int32(n, ref_id);
+ ref_id += 4;
+ } else {
+ ndr_write_int32(n, 0);
+ }
+
+ ndr_write_int64(n, from_kuid(&init_user_ns, inode->i_uid));
+ ndr_write_int64(n, from_kgid(&init_user_ns, inode->i_gid));
+ ndr_write_int32(n, inode->i_mode);
+
+ if (acl) {
+ ndr_encode_posix_acl_entry(n, acl);
+ if (def_acl)
+ ndr_encode_posix_acl_entry(n, def_acl);
+ }
+ return 0;
+}
+
+int ndr_encode_v4_ntacl(struct ndr *n, struct xattr_ntacl *acl)
+{
+ int ref_id = 0x00020004;
+
+ n->offset = 0;
+ n->length = 2048;
+ n->data = kzalloc(n->length, GFP_KERNEL);
+ if (!n->data)
+ return -ENOMEM;
+
+ ndr_write_int16(n, acl->version);
+ ndr_write_int32(n, acl->version);
+ ndr_write_int16(n, 2);
+ ndr_write_int32(n, ref_id);
+
+ /* push hash type and hash 64bytes */
+ ndr_write_int16(n, acl->hash_type);
+ ndr_write_bytes(n, acl->hash, XATTR_SD_HASH_SIZE);
+ ndr_write_bytes(n, acl->desc, acl->desc_len);
+ ndr_write_int64(n, acl->current_time);
+ ndr_write_bytes(n, acl->posix_acl_hash, XATTR_SD_HASH_SIZE);
+
+ /* push ndr for security descriptor */
+ ndr_write_bytes(n, acl->sd_buf, acl->sd_size);
+
+ return 0;
+}
+
+int ndr_decode_v4_ntacl(struct ndr *n, struct xattr_ntacl *acl)
+{
+ int version2;
+
+ n->offset = 0;
+ acl->version = ndr_read_int16(n);
+ if (acl->version != 4) {
+ pr_err("v%d version is not supported\n", acl->version);
+ return -EINVAL;
+ }
+
+ version2 = ndr_read_int32(n);
+ if (acl->version != version2) {
+ pr_err("ndr version mismatched(version: %d, version2: %d)\n",
+ acl->version, version2);
+ return -EINVAL;
+ }
+
+ /* Read Level */
+ ndr_read_int16(n);
+ /* Read Ref Id */
+ ndr_read_int32(n);
+ acl->hash_type = ndr_read_int16(n);
+ ndr_read_bytes(n, acl->hash, XATTR_SD_HASH_SIZE);
+
+ ndr_read_bytes(n, acl->desc, 10);
+ if (strncmp(acl->desc, "posix_acl", 9)) {
+ pr_err("Invalid acl description : %s\n", acl->desc);
+ return -EINVAL;
+ }
+
+ /* Read Time */
+ ndr_read_int64(n);
+ /* Read Posix ACL hash */
+ ndr_read_bytes(n, acl->posix_acl_hash, XATTR_SD_HASH_SIZE);
+ acl->sd_size = n->length - n->offset;
+ acl->sd_buf = kzalloc(acl->sd_size, GFP_KERNEL);
+ if (!acl->sd_buf)
+ return -ENOMEM;
+
+ ndr_read_bytes(n, acl->sd_buf, acl->sd_size);
+
+ return 0;
+}
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