[linux-block.git] / fs / cifsd / ndr.c

// 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) {
		ksmbd_err("v%d version is not supported\n", da->version);
		return -EINVAL;
	}

	version2 = ndr_read_int32(n);
	if (da->version != version2) {
		ksmbd_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) {
		ksmbd_err("v%d version is not supported\n", acl->version);
		return -EINVAL;
	}

	version2 = ndr_read_int32(n);
	if (acl->version != version2) {
		ksmbd_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)) {
		ksmbd_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;
}
Commit	Line	Data
e2f34481 NJ	1	// SPDX-License-Identifier: GPL-2.0-or-later
	2	/*
	3	* Copyright (C) 2021 Samsung Electronics Co., Ltd.
	4	* Author(s): Namjae Jeon <linkinjeon@kernel.org>
	5	*/
	6
	7	#include <linux/fs.h>
	8
	9	#include "glob.h"
	10	#include "ndr.h"
	11
	12	#define PAYLOAD_HEAD(d) ((d)->data + (d)->offset)
	13
	14	#define KSMBD_ALIGN_MASK(x, mask) (((x) + (mask)) & ~(mask))
	15
	16	#define KSMBD_ALIGN(x, a) \
	17	({ \
	18	typeof(x) ret = (x); \
	19	if (((x) & ((typeof(x))(a) - 1)) != 0) \
	20	ret = KSMBD_ALIGN_MASK(x, (typeof(x))(a) - 1); \
	21	ret; \
	22	})
	23
	24	static void align_offset(struct ndr *ndr, int n)
	25	{
	26	ndr->offset = KSMBD_ALIGN(ndr->offset, n);
	27	}
	28
	29	static int try_to_realloc_ndr_blob(struct ndr *n, size_t sz)
	30	{
	31	char *data;
	32
	33	data = krealloc(n->data, n->offset + sz + 1024, GFP_KERNEL);
	34	if (!data)
	35	return -ENOMEM;
	36
	37	n->data = data;
	38	n->length += 1024;
	39	memset(n->data + n->offset, 0, 1024);
	40	return 0;
	41	}
	42
	43	static void ndr_write_int16(struct ndr *n, __u16 value)
	44	{
	45	if (n->length <= n->offset + sizeof(value))
	46	try_to_realloc_ndr_blob(n, sizeof(value));
	47
	48	(__le16 )PAYLOAD_HEAD(n) = cpu_to_le16(value);
	49	n->offset += sizeof(value);
	50	}
	51
	52	static void ndr_write_int32(struct ndr *n, __u32 value)
	53	{
	54	if (n->length <= n->offset + sizeof(value))
	55	try_to_realloc_ndr_blob(n, sizeof(value));
	56
	57	(__le32 )PAYLOAD_HEAD(n) = cpu_to_le32(value);
	58	n->offset += sizeof(value);
	59	}
	60
	61	static void ndr_write_int64(struct ndr *n, __u64 value)
	62	{
	63	if (n->length <= n->offset + sizeof(value))
	64	try_to_realloc_ndr_blob(n, sizeof(value));
65
66	(__le64 )PAYLOAD_HEAD(n) = cpu_to_le64(value);
67	n->offset += sizeof(value);
68	}
69
70	static int ndr_write_bytes(struct ndr n, void value, size_t sz)
71	{
72	if (n->length <= n->offset + sz)
73	try_to_realloc_ndr_blob(n, sz);
74
75	memcpy(PAYLOAD_HEAD(n), value, sz);
76	n->offset += sz;
77	return 0;
78	}
79
80	static int ndr_write_string(struct ndr n, void value, size_t sz)
81	{
82	if (n->length <= n->offset + sz)
83	try_to_realloc_ndr_blob(n, sz);
84
85	strncpy(PAYLOAD_HEAD(n), value, sz);
86	sz++;
87	n->offset += sz;
88	align_offset(n, 2);
89	return 0;
90	}
91
92	static int ndr_read_string(struct ndr n, void value, size_t sz)
93	{
94	int len = strnlen(PAYLOAD_HEAD(n), sz);
95
96	memcpy(value, PAYLOAD_HEAD(n), len);
97	len++;
98	n->offset += len;
99	align_offset(n, 2);
100	return 0;
101	}
102
103	static int ndr_read_bytes(struct ndr n, void value, size_t sz)
104	{
105	memcpy(value, PAYLOAD_HEAD(n), sz);
106	n->offset += sz;
107	return 0;
108	}
109
110	static __u16 ndr_read_int16(struct ndr *n)
111	{
112	__u16 ret;
113
114	ret = le16_to_cpu((__le16 )PAYLOAD_HEAD(n));
115	n->offset += sizeof(__u16);
116	return ret;
117	}
118
119	static __u32 ndr_read_int32(struct ndr *n)
120	{
121	__u32 ret;
122
123	ret = le32_to_cpu((__le32 )PAYLOAD_HEAD(n));
124	n->offset += sizeof(__u32);
125	return ret;
126	}
127
128	static __u64 ndr_read_int64(struct ndr *n)
129	{
130	__u64 ret;
131
132	ret = le64_to_cpu((__le64 )PAYLOAD_HEAD(n));
133	n->offset += sizeof(__u64);
134	return ret;
135	}
136
137	int ndr_encode_dos_attr(struct ndr n, struct xattr_dos_attrib da)
138	{
139	char hex_attr[12] = {0};
140
141	n->offset = 0;
142	n->length = 1024;
143	n->data = kzalloc(n->length, GFP_KERNEL);
144	if (!n->data)
145	return -ENOMEM;
146
147	if (da->version == 3) {
148	snprintf(hex_attr, 10, "0x%x", da->attr);
149	ndr_write_string(n, hex_attr, strlen(hex_attr));
150	} else {
151	ndr_write_string(n, "", strlen(""));
152	}
153	ndr_write_int16(n, da->version);
154	ndr_write_int32(n, da->version);
155
156	ndr_write_int32(n, da->flags);
157	ndr_write_int32(n, da->attr);
158	if (da->version == 3) {
159	ndr_write_int32(n, da->ea_size);
160	ndr_write_int64(n, da->size);
161	ndr_write_int64(n, da->alloc_size);
162	} else
163	ndr_write_int64(n, da->itime);
164	ndr_write_int64(n, da->create_time);
165	if (da->version == 3)
166	ndr_write_int64(n, da->change_time);
167	return 0;
168	}
169
170	int ndr_decode_dos_attr(struct ndr n, struct xattr_dos_attrib da)
171	{
172	char hex_attr[12] = {0};
173	int version2;
174
175	n->offset = 0;
176	ndr_read_string(n, hex_attr, n->length - n->offset);
177	da->version = ndr_read_int16(n);
178
179	if (da->version != 3 && da->version != 4) {
180	ksmbd_err("v%d version is not supported\n", da->version);
181	return -EINVAL;
182	}
183
184	version2 = ndr_read_int32(n);
185	if (da->version != version2) {
186	ksmbd_err("ndr version mismatched(version: %d, version2: %d)\n",
187	da->version, version2);
188	return -EINVAL;
189	}
190
191	ndr_read_int32(n);
192	da->attr = ndr_read_int32(n);
193	if (da->version == 4) {
194	da->itime = ndr_read_int64(n);
195	da->create_time = ndr_read_int64(n);
196	} else {
197	ndr_read_int32(n);
198	ndr_read_int64(n);
199	ndr_read_int64(n);
200	da->create_time = ndr_read_int64(n);
201	ndr_read_int64(n);
202	}
203
204	return 0;
205	}
206
207	static int ndr_encode_posix_acl_entry(struct ndr n, struct xattr_smb_acl acl)
208	{
209	int i;
210
211	ndr_write_int32(n, acl->count);
212	align_offset(n, 8);
213	ndr_write_int32(n, acl->count);
214	ndr_write_int32(n, 0);
215
216	for (i = 0; i < acl->count; i++) {
217	align_offset(n, 8);
218	ndr_write_int16(n, acl->entries[i].type);
219	ndr_write_int16(n, acl->entries[i].type);
220
221	if (acl->entries[i].type == SMB_ACL_USER) {
222	align_offset(n, 8);
223	ndr_write_int64(n, acl->entries[i].uid);
224	} else if (acl->entries[i].type == SMB_ACL_GROUP) {
225	align_offset(n, 8);
226	ndr_write_int64(n, acl->entries[i].gid);
227	}
228
229	/* push permission */
230	ndr_write_int32(n, acl->entries[i].perm);
231	}
232
233	return 0;
234	}
235
236	int ndr_encode_posix_acl(struct ndr n, struct inode inode,
237	struct xattr_smb_acl acl, struct xattr_smb_acl def_acl)
238	{
239	int ref_id = 0x00020000;
240
241	n->offset = 0;
242	n->length = 1024;
243	n->data = kzalloc(n->length, GFP_KERNEL);
244	if (!n->data)
245	return -ENOMEM;
246
247	if (acl) {
248	/* ACL ACCESS */
249	ndr_write_int32(n, ref_id);
250	ref_id += 4;
251	} else
252	ndr_write_int32(n, 0);
253
254	if (def_acl) {
255	/* DEFAULT ACL ACCESS */
256	ndr_write_int32(n, ref_id);
257	ref_id += 4;
258	} else
259	ndr_write_int32(n, 0);
260
261	ndr_write_int64(n, from_kuid(&init_user_ns, inode->i_uid));
262	ndr_write_int64(n, from_kgid(&init_user_ns, inode->i_gid));
263	ndr_write_int32(n, inode->i_mode);
264
265	if (acl) {
266	ndr_encode_posix_acl_entry(n, acl);
267	if (def_acl)
268	ndr_encode_posix_acl_entry(n, def_acl);
269	}
270	return 0;
271	}
272
273	int ndr_encode_v4_ntacl(struct ndr n, struct xattr_ntacl acl)
274	{
275	int ref_id = 0x00020004;
276
277	n->offset = 0;
278	n->length = 2048;
279	n->data = kzalloc(n->length, GFP_KERNEL);
280	if (!n->data)
281	return -ENOMEM;
282
283	ndr_write_int16(n, acl->version);
284	ndr_write_int32(n, acl->version);
285	ndr_write_int16(n, 2);
286	ndr_write_int32(n, ref_id);
287
288	/* push hash type and hash 64bytes */
289	ndr_write_int16(n, acl->hash_type);
290	ndr_write_bytes(n, acl->hash, XATTR_SD_HASH_SIZE);
291	ndr_write_bytes(n, acl->desc, acl->desc_len);
292	ndr_write_int64(n, acl->current_time);
293	ndr_write_bytes(n, acl->posix_acl_hash, XATTR_SD_HASH_SIZE);
294
295	/* push ndr for security descriptor */
296	ndr_write_bytes(n, acl->sd_buf, acl->sd_size);
297
298	return 0;
299	}
300
301	int ndr_decode_v4_ntacl(struct ndr n, struct xattr_ntacl acl)
302	{
303	int version2;
304
305	n->offset = 0;
306	acl->version = ndr_read_int16(n);
307	if (acl->version != 4) {
308	ksmbd_err("v%d version is not supported\n", acl->version);
309	return -EINVAL;
310	}
311
312	version2 = ndr_read_int32(n);
313	if (acl->version != version2) {
314	ksmbd_err("ndr version mismatched(version: %d, version2: %d)\n",
315	acl->version, version2);
316	return -EINVAL;
317	}
318
319	/* Read Level */
320	ndr_read_int16(n);
321	/* Read Ref Id */
322	ndr_read_int32(n);
323	acl->hash_type = ndr_read_int16(n);
324	ndr_read_bytes(n, acl->hash, XATTR_SD_HASH_SIZE);
325
326	ndr_read_bytes(n, acl->desc, 10);
327	if (strncmp(acl->desc, "posix_acl", 9)) {
1e853b93	328	ksmbd_err("Invalid acl description : %s\n", acl->desc);
e2f34481 NJ	329	return -EINVAL;
	330	}
	331
	332	/* Read Time */
	333	ndr_read_int64(n);
	334	/* Read Posix ACL hash */
	335	ndr_read_bytes(n, acl->posix_acl_hash, XATTR_SD_HASH_SIZE);
	336	acl->sd_size = n->length - n->offset;
	337	acl->sd_buf = kzalloc(acl->sd_size, GFP_KERNEL);
	338	if (!acl->sd_buf)
	339	return -ENOMEM;
	340
	341	ndr_read_bytes(n, acl->sd_buf, acl->sd_size);
	342
	343	return 0;
	344	}