1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org> 4 * Copyright (C) 2018 Samsung Electronics Co., Ltd. 5 */ 6 7 #include <linux/kernel.h> 8 #include <linux/xattr.h> 9 #include <linux/fs.h> 10 #include <linux/unicode.h> 11 12 #include "misc.h" 13 #include "smb_common.h" 14 #include "connection.h" 15 #include "vfs.h" 16 17 #include "mgmt/share_config.h" 18 19 /** 20 * match_pattern() - compare a string with a pattern which might include 21 * wildcard '*' and '?' 22 * TODO : implement consideration about DOS_DOT, DOS_QM and DOS_STAR 23 * 24 * @str: string to compare with a pattern 25 * @len: string length 26 * @pattern: pattern string which might include wildcard '*' and '?' 27 * 28 * Return: 0 if pattern matched with the string, otherwise non zero value 29 */ 30 int match_pattern(const char *str, size_t len, const char *pattern) 31 { 32 const char *s = str; 33 const char *p = pattern; 34 bool star = false; 35 36 while (*s && len) { 37 switch (*p) { 38 case '?': 39 s++; 40 len--; 41 p++; 42 break; 43 case '*': 44 star = true; 45 str = s; 46 if (!*++p) 47 return true; 48 pattern = p; 49 break; 50 default: 51 if (tolower(*s) == tolower(*p)) { 52 s++; 53 len--; 54 p++; 55 } else { 56 if (!star) 57 return false; 58 str++; 59 s = str; 60 p = pattern; 61 } 62 break; 63 } 64 } 65 66 if (*p == '*') 67 ++p; 68 return !*p; 69 } 70 71 /* 72 * is_char_allowed() - check for valid character 73 * @ch: input character to be checked 74 * 75 * Return: 1 if char is allowed, otherwise 0 76 */ 77 static inline int is_char_allowed(char ch) 78 { 79 /* check for control chars, wildcards etc. */ 80 if (!(ch & 0x80) && 81 (ch <= 0x1f || 82 ch == '?' || ch == '"' || ch == '<' || 83 ch == '>' || ch == '|' || ch == '*')) 84 return 0; 85 86 return 1; 87 } 88 89 int ksmbd_validate_filename(char *filename) 90 { 91 while (*filename) { 92 char c = *filename; 93 94 filename++; 95 if (!is_char_allowed(c)) { 96 ksmbd_debug(VFS, "File name validation failed: 0x%x\n", c); 97 return -ENOENT; 98 } 99 } 100 101 return 0; 102 } 103 104 static int ksmbd_validate_stream_name(char *stream_name) 105 { 106 while (*stream_name) { 107 char c = *stream_name; 108 109 stream_name++; 110 if (c == '/' || c == ':' || c == '\\') { 111 pr_err("Stream name validation failed: %c\n", c); 112 return -ENOENT; 113 } 114 } 115 116 return 0; 117 } 118 119 int parse_stream_name(char *filename, char **stream_name, int *s_type) 120 { 121 char *stream_type; 122 char *s_name; 123 int rc = 0; 124 bool has_stream_type = false; 125 126 *stream_name = NULL; 127 s_name = filename; 128 filename = strsep(&s_name, ":"); 129 ksmbd_debug(SMB, "filename : %s, streams : %s\n", filename, s_name); 130 if (strchr(s_name, ':')) { 131 stream_type = s_name; 132 s_name = strsep(&stream_type, ":"); 133 134 rc = ksmbd_validate_stream_name(s_name); 135 if (rc < 0) { 136 rc = -ENOENT; 137 goto out; 138 } 139 140 ksmbd_debug(SMB, "stream name : %s, stream type : %s\n", s_name, 141 stream_type); 142 if (!strncasecmp("$data", stream_type, 5)) { 143 *s_type = DATA_STREAM; 144 has_stream_type = true; 145 } else if (!strncasecmp("$index_allocation", stream_type, 17)) { 146 *s_type = DIR_STREAM; 147 has_stream_type = true; 148 } else { 149 rc = -ENOENT; 150 } 151 } 152 153 if (has_stream_type && !s_name[0] && *s_type == DATA_STREAM) 154 goto out; 155 156 *stream_name = s_name; 157 out: 158 return rc; 159 } 160 161 /** 162 * convert_to_nt_pathname() - extract and return windows path string 163 * whose share directory prefix was removed from file path 164 * @share: ksmbd_share_config pointer 165 * @path: path to report 166 * 167 * Return : windows path string or error 168 */ 169 170 char *convert_to_nt_pathname(struct ksmbd_share_config *share, 171 const struct path *path) 172 { 173 char *pathname, *ab_pathname, *nt_pathname; 174 int share_path_len = share->path_sz; 175 size_t ab_pathname_len; 176 int prefix; 177 178 pathname = kmalloc(PATH_MAX, KSMBD_DEFAULT_GFP); 179 if (!pathname) 180 return ERR_PTR(-EACCES); 181 182 ab_pathname = d_path(path, pathname, PATH_MAX); 183 if (IS_ERR(ab_pathname)) { 184 nt_pathname = ERR_PTR(-EACCES); 185 goto free_pathname; 186 } 187 188 if (strncmp(ab_pathname, share->path, share_path_len)) { 189 nt_pathname = ERR_PTR(-EACCES); 190 goto free_pathname; 191 } 192 193 ab_pathname_len = strlen(&ab_pathname[share_path_len]); 194 prefix = ab_pathname[share_path_len] == '\0' ? 1 : 0; 195 nt_pathname = kmalloc(prefix + ab_pathname_len + 1, KSMBD_DEFAULT_GFP); 196 if (!nt_pathname) { 197 nt_pathname = ERR_PTR(-ENOMEM); 198 goto free_pathname; 199 } 200 201 if (prefix) 202 *nt_pathname = '/'; 203 memcpy(nt_pathname + prefix, &ab_pathname[share_path_len], 204 ab_pathname_len + 1); 205 206 ksmbd_conv_path_to_windows(nt_pathname); 207 208 free_pathname: 209 kfree(pathname); 210 return nt_pathname; 211 } 212 213 int get_nlink(struct kstat *st) 214 { 215 int nlink; 216 217 nlink = st->nlink; 218 if (S_ISDIR(st->mode)) 219 nlink--; 220 221 return nlink; 222 } 223 224 void ksmbd_conv_path_to_unix(char *path) 225 { 226 strreplace(path, '\\', '/'); 227 } 228 229 void ksmbd_strip_last_slash(char *path) 230 { 231 int len = strlen(path); 232 233 while (len && path[len - 1] == '/') { 234 path[len - 1] = '\0'; 235 len--; 236 } 237 } 238 239 void ksmbd_conv_path_to_windows(char *path) 240 { 241 strreplace(path, '/', '\\'); 242 } 243 244 char *ksmbd_casefold_sharename(struct unicode_map *um, const char *name) 245 { 246 char *cf_name; 247 int cf_len; 248 249 cf_name = kzalloc(KSMBD_REQ_MAX_SHARE_NAME, KSMBD_DEFAULT_GFP); 250 if (!cf_name) 251 return ERR_PTR(-ENOMEM); 252 253 if (IS_ENABLED(CONFIG_UNICODE) && um) { 254 const struct qstr q_name = {.name = name, .len = strlen(name)}; 255 256 cf_len = utf8_casefold(um, &q_name, cf_name, 257 KSMBD_REQ_MAX_SHARE_NAME); 258 if (cf_len < 0) 259 goto out_ascii; 260 261 return cf_name; 262 } 263 264 out_ascii: 265 cf_len = strscpy(cf_name, name, KSMBD_REQ_MAX_SHARE_NAME); 266 if (cf_len < 0) { 267 kfree(cf_name); 268 return ERR_PTR(-E2BIG); 269 } 270 271 for (; *cf_name; ++cf_name) 272 *cf_name = isascii(*cf_name) ? tolower(*cf_name) : *cf_name; 273 return cf_name - cf_len; 274 } 275 276 /** 277 * ksmbd_extract_sharename() - get share name from tree connect request 278 * @um: pointer to a unicode_map structure for character encoding handling 279 * @treename: buffer containing tree name and share name 280 * 281 * Return: share name on success, otherwise error 282 */ 283 char *ksmbd_extract_sharename(struct unicode_map *um, const char *treename) 284 { 285 const char *name = treename, *pos = strrchr(name, '\\'); 286 287 if (pos) 288 name = (pos + 1); 289 290 /* caller has to free the memory */ 291 return ksmbd_casefold_sharename(um, name); 292 } 293 294 char *ksmbd_convert_dir_info_name(struct ksmbd_dir_info *d_info, 295 const struct nls_table *local_nls, 296 int *conv_len) 297 { 298 char *conv; 299 int sz = min(4 * d_info->name_len, PATH_MAX); 300 301 if (!sz) 302 return NULL; 303 304 conv = kmalloc(sz, KSMBD_DEFAULT_GFP); 305 if (!conv) 306 return NULL; 307 308 /* XXX */ 309 *conv_len = smbConvertToUTF16((__le16 *)conv, d_info->name, 310 d_info->name_len, local_nls, 0); 311 *conv_len *= 2; 312 313 /* We allocate buffer twice bigger than needed. */ 314 conv[*conv_len] = 0x00; 315 conv[*conv_len + 1] = 0x00; 316 return conv; 317 } 318 319 /* 320 * Convert the NT UTC (based 1601-01-01, in hundred nanosecond units) 321 * into Unix UTC (based 1970-01-01, in seconds). 322 */ 323 struct timespec64 ksmbd_NTtimeToUnix(__le64 ntutc) 324 { 325 struct timespec64 ts; 326 327 /* Subtract the NTFS time offset, then convert to 1s intervals. */ 328 s64 t = le64_to_cpu(ntutc) - NTFS_TIME_OFFSET; 329 u64 abs_t; 330 331 /* 332 * Unfortunately can not use normal 64 bit division on 32 bit arch, but 333 * the alternative, do_div, does not work with negative numbers so have 334 * to special case them 335 */ 336 if (t < 0) { 337 abs_t = -t; 338 ts.tv_nsec = do_div(abs_t, 10000000) * 100; 339 ts.tv_nsec = -ts.tv_nsec; 340 ts.tv_sec = -abs_t; 341 } else { 342 abs_t = t; 343 ts.tv_nsec = do_div(abs_t, 10000000) * 100; 344 ts.tv_sec = abs_t; 345 } 346 347 return ts; 348 } 349 350 /* Convert the Unix UTC into NT UTC. */ 351 inline u64 ksmbd_UnixTimeToNT(struct timespec64 t) 352 { 353 /* Convert to 100ns intervals and then add the NTFS time offset. */ 354 return (u64)t.tv_sec * 10000000 + t.tv_nsec / 100 + NTFS_TIME_OFFSET; 355 } 356 357 inline long long ksmbd_systime(void) 358 { 359 struct timespec64 ts; 360 361 ktime_get_real_ts64(&ts); 362 return ksmbd_UnixTimeToNT(ts); 363 } 364