J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2004-2007 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| 13 | * accompanied this code). |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License version |
| 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | * |
| 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | #include <stdio.h> |
| 25 | #include <windows.h> |
| 26 | #include <malloc.h> |
| 27 | #include <string.h> |
| 28 | |
| 29 | /* |
| 30 | * Simple Windows utility to remove all non-owner access to a given |
| 31 | * file - suitable for NT/2000/XP only. |
| 32 | */ |
| 33 | |
| 34 | |
| 35 | /* |
| 36 | * Access mask to represent any file access |
| 37 | */ |
| 38 | #define ANY_ACCESS (FILE_GENERIC_READ | FILE_GENERIC_WRITE | FILE_GENERIC_EXECUTE) |
| 39 | |
| 40 | |
| 41 | /* |
| 42 | * Print error message to stderr |
| 43 | */ |
| 44 | static void printLastError(const char* msg) { |
| 45 | int len; |
| 46 | char buf[128]; |
| 47 | DWORD errval; |
| 48 | |
| 49 | buf[0] = '\0'; |
| 50 | len = sizeof(buf); |
| 51 | |
| 52 | errval = GetLastError(); |
| 53 | if (errval != 0) { |
| 54 | int n = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, |
| 55 | NULL, errval, |
| 56 | 0, buf, len, NULL); |
| 57 | if (n > 3) { |
| 58 | /* Drop final '.', CR, LF */ |
| 59 | if (buf[n - 1] == '\n') n--; |
| 60 | if (buf[n - 1] == '\r') n--; |
| 61 | if (buf[n - 1] == '.') n--; |
| 62 | buf[n] = '\0'; |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | if (strlen(buf) > 0) { |
| 67 | fprintf(stderr, "revokeall %s: %s\n", msg, buf); |
| 68 | } else { |
| 69 | fprintf(stderr, "revokeall %s\n", msg); |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | |
| 74 | |
| 75 | /* |
| 76 | * Return a string that includes all the components of a given SID. |
| 77 | * See here for a description of the SID components :- |
| 78 | * http://msdn.microsoft.com/library/default.asp?url=/library/en-us/security/security/sid_components.asp |
| 79 | */ |
| 80 | static char *getTextualSid(SID* sid) { |
| 81 | SID_IDENTIFIER_AUTHORITY* sia; |
| 82 | DWORD i, count; |
| 83 | DWORD len; |
| 84 | char* name; |
| 85 | |
| 86 | /* |
| 87 | * Get the identifier authority and the number of sub-authorities |
| 88 | */ |
| 89 | sia = GetSidIdentifierAuthority(sid); |
| 90 | count = *GetSidSubAuthorityCount(sid); |
| 91 | |
| 92 | /* |
| 93 | * Allocate buffer for the string - buffer is :- |
| 94 | * S-SID_REVISION- + identifierAuthority- + subauthorities- + NULL |
| 95 | */ |
| 96 | len=(15 + 12 + (12 * count) + 1) * sizeof(char); |
| 97 | name = (char*)malloc(len); |
| 98 | if (name == NULL) { |
| 99 | return NULL; |
| 100 | } |
| 101 | |
| 102 | // S-SID_REVISION |
| 103 | sprintf(name, "S-%lu-", SID_REVISION ); |
| 104 | |
| 105 | // Identifier authority |
| 106 | if ((sia->Value[0] != 0) || (sia->Value[1] != 0)) |
| 107 | { |
| 108 | sprintf(name + strlen(name), "0x%02hx%02hx%02hx%02hx%02hx%02hx", |
| 109 | (USHORT)sia->Value[0], |
| 110 | (USHORT)sia->Value[1], |
| 111 | (USHORT)sia->Value[2], |
| 112 | (USHORT)sia->Value[3], |
| 113 | (USHORT)sia->Value[4], |
| 114 | (USHORT)sia->Value[5]); |
| 115 | } |
| 116 | else |
| 117 | { |
| 118 | sprintf(name + strlen(name), "%lu", |
| 119 | (ULONG)(sia->Value[5] ) + |
| 120 | (ULONG)(sia->Value[4] << 8) + |
| 121 | (ULONG)(sia->Value[3] << 16) + |
| 122 | (ULONG)(sia->Value[2] << 24) ); |
| 123 | } |
| 124 | |
| 125 | // finally, the sub-authorities |
| 126 | for (i=0 ; i<count; i++) { |
| 127 | sprintf(name + strlen(name), "-%lu", |
| 128 | *GetSidSubAuthority(sid, i) ); |
| 129 | } |
| 130 | |
| 131 | return name; |
| 132 | } |
| 133 | |
| 134 | /* |
| 135 | * Returns a string to represent the given security identifier (SID). |
| 136 | * If the account is known to the local computer then the account |
| 137 | * domain is returned. The format will be \\name or domain\\name depending |
| 138 | * on if the computer belongs to a domain. |
| 139 | * If the account name is not known then the textual representation of |
| 140 | * SID is returned -- eg: S-1-5-21-2818032319-470147023-1036452850-13037. |
| 141 | */ |
| 142 | static char *getSIDString(SID* sid) { |
| 143 | char domain[255]; |
| 144 | char name[255]; |
| 145 | DWORD domainLen = sizeof(domain); |
| 146 | DWORD nameLen = sizeof(name); |
| 147 | SID_NAME_USE use; |
| 148 | |
| 149 | if(!IsValidSid(sid)) { |
| 150 | return strdup("<Invalid SID>"); |
| 151 | } |
| 152 | |
| 153 | if (LookupAccountSid(NULL, sid, name, &nameLen, domain, &domainLen, &use)) { |
| 154 | int len = strlen(name) + strlen(domain) + 3; |
| 155 | char* s = (char*)malloc(len); |
| 156 | if (s != NULL) { |
| 157 | strcpy(s, domain); |
| 158 | strcat(s, "\\\\"); |
| 159 | strcat(s, name); |
| 160 | } |
| 161 | return s; |
| 162 | } else { |
| 163 | return getTextualSid(sid); |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | |
| 168 | |
| 169 | /* |
| 170 | * Returns 1 if the specified file is on a file system that supports |
| 171 | * persistent ACLs (On NTFS file systems returns true, on FAT32 file systems |
| 172 | * returns false), otherwise 0. Returns -1 if error. |
| 173 | */ |
| 174 | static int isSecuritySupported(const char* path) { |
| 175 | char* root; |
| 176 | char* p; |
| 177 | BOOL res; |
| 178 | DWORD dwMaxComponentLength; |
| 179 | DWORD dwFlags; |
| 180 | char fsName[128]; |
| 181 | DWORD fsNameLength; |
| 182 | |
| 183 | /* |
| 184 | * Get root directory. For UNCs the slash after the share name is required. |
| 185 | */ |
| 186 | root = strdup(path); |
| 187 | if (*root == '\\') { |
| 188 | /* |
| 189 | * \\server\share\file ==> \\server\share\ |
| 190 | */ |
| 191 | int slashskip = 3; |
| 192 | p = root; |
| 193 | while ((*p == '\\') && (slashskip > 0)) { |
| 194 | char* p2; |
| 195 | p++; |
| 196 | p2 = strchr(p, '\\'); |
| 197 | if ((p2 == NULL) || (*p2 != '\\')) { |
| 198 | free(root); |
| 199 | fprintf(stderr, "Malformed UNC"); |
| 200 | return -1; |
| 201 | } |
| 202 | p = p2; |
| 203 | slashskip--; |
| 204 | } |
| 205 | if (slashskip != 0) { |
| 206 | free(root); |
| 207 | fprintf(stderr, "Malformed UNC"); |
| 208 | return -1; |
| 209 | } |
| 210 | p++; |
| 211 | *p = '\0'; |
| 212 | |
| 213 | } else { |
| 214 | p = strchr(root, '\\'); |
| 215 | |
| 216 | /* |
| 217 | * Relative path so use current directory |
| 218 | */ |
| 219 | if (p == NULL) { |
| 220 | free(root); |
| 221 | root = malloc(255); |
| 222 | if (GetCurrentDirectory(255, root) == 0) { |
| 223 | printLastError("GetCurrentDirectory failed"); |
| 224 | return -1; |
| 225 | } |
| 226 | p = strchr(root, '\\'); |
| 227 | if (p == NULL) { |
| 228 | fprintf(stderr, "GetCurrentDirectory doesn't include drive letter!!!!\n"); |
| 229 | return -1; |
| 230 | } |
| 231 | } |
| 232 | p++; |
| 233 | *p = '\0'; |
| 234 | } |
| 235 | |
| 236 | /* |
| 237 | * Get the volume information - this gives us the file system file and |
| 238 | * also tells us if the file system supports persistent ACLs. |
| 239 | */ |
| 240 | fsNameLength = sizeof(fsName)-1; |
| 241 | res = GetVolumeInformation(root, |
| 242 | NULL, // address of name of the volume, can be NULL |
| 243 | 0, // length of volume name |
| 244 | NULL, // address of volume serial number, can be NULL |
| 245 | &dwMaxComponentLength, |
| 246 | &dwFlags, |
| 247 | fsName, |
| 248 | fsNameLength); |
| 249 | if (res == 0) { |
| 250 | printLastError("GetVolumeInformation failed"); |
| 251 | free(root); |
| 252 | return -1; |
| 253 | } |
| 254 | |
| 255 | free(root); |
| 256 | return (dwFlags & FS_PERSISTENT_ACLS) ? 1 : 0; |
| 257 | } |
| 258 | |
| 259 | |
| 260 | /* |
| 261 | * Returns the security descriptor for a file. |
| 262 | */ |
| 263 | static SECURITY_DESCRIPTOR* getFileSecurityDescriptor(const char* path) { |
| 264 | SECURITY_DESCRIPTOR* sd; |
| 265 | DWORD len = 0; |
| 266 | SECURITY_INFORMATION info = |
| 267 | OWNER_SECURITY_INFORMATION | DACL_SECURITY_INFORMATION; |
| 268 | |
| 269 | GetFileSecurity(path, info , 0, 0, &len); |
| 270 | if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) { |
| 271 | printLastError("GetFileSecurity failed"); |
| 272 | return NULL; |
| 273 | } |
| 274 | sd = (SECURITY_DESCRIPTOR *)malloc(len); |
| 275 | if (sd == NULL) { |
| 276 | fprintf(stderr, "Out of memory"); |
| 277 | } else { |
| 278 | if (!GetFileSecurity(path, info, sd, len, &len)) { |
| 279 | printLastError("GetFileSecurity failed"); |
| 280 | free(sd); |
| 281 | return NULL; |
| 282 | } |
| 283 | } |
| 284 | return sd; |
| 285 | } |
| 286 | |
| 287 | |
| 288 | /* |
| 289 | * Revoke all access to the specific file |
| 290 | */ |
| 291 | static int revokeAll(const char* path) { |
| 292 | SECURITY_DESCRIPTOR* sd; |
| 293 | SID* owner; |
| 294 | ACL *acl; |
| 295 | BOOL defaulted, present; |
| 296 | ACL_SIZE_INFORMATION acl_size_info; |
| 297 | DWORD i, count; |
| 298 | char* str; |
| 299 | |
| 300 | /* |
| 301 | * Get security descriptor for file; From security descriptor get the |
| 302 | * owner SID, and the DACL. |
| 303 | */ |
| 304 | sd = getFileSecurityDescriptor(path); |
| 305 | if (sd == NULL) { |
| 306 | return -1; /* error already reported */ |
| 307 | } |
| 308 | if (!GetSecurityDescriptorOwner(sd, &owner, &defaulted)) { |
| 309 | printLastError("GetSecurityDescriptorOwner failed"); |
| 310 | return -1; |
| 311 | } |
| 312 | str = getSIDString(owner); |
| 313 | if (str != NULL) { |
| 314 | printf("owner: %s\n", str); |
| 315 | free(str); |
| 316 | } |
| 317 | if (!GetSecurityDescriptorDacl(sd, &present, &acl, &defaulted)) { |
| 318 | printLastError("GetSecurityDescriptorDacl failed"); |
| 319 | return -1; |
| 320 | } |
| 321 | if (!present) { |
| 322 | fprintf(stderr, "Security descriptor does not contain a DACL"); |
| 323 | return -1; |
| 324 | } |
| 325 | |
| 326 | /* |
| 327 | * If DACL is NULL there is no access to the file - we are done |
| 328 | */ |
| 329 | if (acl == NULL) { |
| 330 | return 1; |
| 331 | } |
| 332 | |
| 333 | /* |
| 334 | * Iterate over the ACEs. For each "allow" type check that the SID |
| 335 | * matches the owner - if not we remove the ACE from the ACL |
| 336 | */ |
| 337 | if (!GetAclInformation(acl, (void *) &acl_size_info, sizeof(acl_size_info), |
| 338 | AclSizeInformation)) { |
| 339 | printLastError("GetAclInformation failed"); |
| 340 | return -1; |
| 341 | } |
| 342 | count = acl_size_info.AceCount; |
| 343 | i = 0; |
| 344 | while (count > 0) { |
| 345 | void* ace; |
| 346 | ACCESS_ALLOWED_ACE *access; |
| 347 | SID* sid; |
| 348 | BOOL deleted; |
| 349 | |
| 350 | if (!GetAce(acl, i, &ace)) { |
| 351 | printLastError("GetAce failed"); |
| 352 | return -1; |
| 353 | } |
| 354 | if (((ACCESS_ALLOWED_ACE *)ace)->Header.AceType != ACCESS_ALLOWED_ACE_TYPE) { |
| 355 | continue; |
| 356 | } |
| 357 | access = (ACCESS_ALLOWED_ACE *)ace; |
| 358 | sid = (SID *) &access->SidStart; |
| 359 | |
| 360 | |
| 361 | deleted = FALSE; |
| 362 | if (!EqualSid(owner, sid)) { |
| 363 | /* |
| 364 | * If the ACE allows any access then the file then we |
| 365 | * delete it. |
| 366 | */ |
| 367 | if (access->Mask & ANY_ACCESS) { |
| 368 | str = getSIDString(sid); |
| 369 | if (str != NULL) { |
| 370 | printf("remove ALLOW %s\n", str); |
| 371 | free(str); |
| 372 | } |
| 373 | if (DeleteAce(acl, i) == 0) { |
| 374 | printLastError("DeleteAce failed"); |
| 375 | return -1; |
| 376 | } |
| 377 | deleted = TRUE; |
| 378 | } |
| 379 | } |
| 380 | |
| 381 | if (!deleted) { |
| 382 | str = getSIDString(sid); |
| 383 | if (str != NULL) { |
| 384 | printf("ALLOW %s (access mask=%x)\n", str, access->Mask); |
| 385 | free(str); |
| 386 | } |
| 387 | |
| 388 | /* onto the next ACE */ |
| 389 | i++; |
| 390 | } |
| 391 | count--; |
| 392 | } |
| 393 | |
| 394 | /* |
| 395 | * No changes - only owner has access |
| 396 | */ |
| 397 | if (i == acl_size_info.AceCount) { |
| 398 | printf("No changes.\n"); |
| 399 | return 1; |
| 400 | } |
| 401 | |
| 402 | /* |
| 403 | * Create security descriptor and set its DACL to the version |
| 404 | * that we just edited |
| 405 | */ |
| 406 | if (!InitializeSecurityDescriptor(sd, SECURITY_DESCRIPTOR_REVISION)) { |
| 407 | printLastError("InitializeSecurityDescriptor failed"); |
| 408 | return -1; |
| 409 | } |
| 410 | if (!SetSecurityDescriptorDacl(sd, present, acl, defaulted)) { |
| 411 | printLastError("SetSecurityDescriptorDacl failed"); |
| 412 | return -1; |
| 413 | } |
| 414 | if (!SetFileSecurity(path, DACL_SECURITY_INFORMATION, sd)) { |
| 415 | printLastError("SetFileSecurity failed"); |
| 416 | return -1; |
| 417 | } |
| 418 | |
| 419 | printf("File updated.\n"); |
| 420 | |
| 421 | return 1; |
| 422 | } |
| 423 | |
| 424 | /* |
| 425 | * Convert slashes in the pathname to backslashes if needed. |
| 426 | */ |
| 427 | static char* convert_path(const char* p) { |
| 428 | int i = 0; |
| 429 | char* path = strdup(p); |
| 430 | while (p[i] != '\0') { |
| 431 | if (p[i] == '/') { |
| 432 | path[i] = '\\'; |
| 433 | } |
| 434 | i++; |
| 435 | } |
| 436 | return path; |
| 437 | } |
| 438 | |
| 439 | /* |
| 440 | * Usage: revokeall file |
| 441 | */ |
| 442 | int main( int argc, char *argv[]) |
| 443 | { |
| 444 | int rc; |
| 445 | const char* path; |
| 446 | |
| 447 | if (argc != 2) { |
| 448 | fprintf(stderr, "Usage: %s file\n", argv[0]); |
| 449 | return -1; |
| 450 | } |
| 451 | path = convert_path(argv[1]); |
| 452 | printf("Revoking all non-owner access to %s\n", path); |
| 453 | rc = isSecuritySupported(path); |
| 454 | if (rc != 1) { |
| 455 | if (rc == 0) { |
| 456 | printf("File security not supported on this file system\n"); |
| 457 | } |
| 458 | return rc; |
| 459 | } else { |
| 460 | return revokeAll(path); |
| 461 | } |
| 462 | } |