1 /*- 2 * Copyright (c) 2008, 2009 Edward Tomasz Napierała <trasz@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <stdio.h> 31 #include <stdlib.h> 32 #include <string.h> 33 #include <assert.h> 34 #include <err.h> 35 #include <sys/acl.h> 36 #include "acl_support.h" 37 38 struct flagnames_struct { 39 uint32_t flag; 40 const char *name; 41 char letter; 42 }; 43 44 struct flagnames_struct a_flags[] = 45 {{ ACL_ENTRY_FILE_INHERIT, "file_inherit", 'f'}, 46 { ACL_ENTRY_DIRECTORY_INHERIT, "dir_inherit", 'd'}, 47 { ACL_ENTRY_INHERIT_ONLY, "inherit_only", 'i'}, 48 { ACL_ENTRY_NO_PROPAGATE_INHERIT, "no_propagate", 'n'}, 49 { ACL_ENTRY_SUCCESSFUL_ACCESS, "successfull_access", 'S'}, 50 { ACL_ENTRY_FAILED_ACCESS, "failed_access", 'F'}, 51 { ACL_ENTRY_INHERITED, "inherited", 'I' }, 52 /* 53 * There is no ACE_IDENTIFIER_GROUP here - SunOS does not show it 54 * in the "flags" field. There is no ACE_OWNER, ACE_GROUP or 55 * ACE_EVERYONE either, for obvious reasons. 56 */ 57 { 0, 0, 0}}; 58 59 struct flagnames_struct a_access_masks[] = 60 {{ ACL_READ_DATA, "read_data", 'r'}, 61 { ACL_WRITE_DATA, "write_data", 'w'}, 62 { ACL_EXECUTE, "execute", 'x'}, 63 { ACL_APPEND_DATA, "append_data", 'p'}, 64 { ACL_DELETE_CHILD, "delete_child", 'D'}, 65 { ACL_DELETE, "delete", 'd'}, 66 { ACL_READ_ATTRIBUTES, "read_attributes", 'a'}, 67 { ACL_WRITE_ATTRIBUTES, "write_attributes", 'A'}, 68 { ACL_READ_NAMED_ATTRS, "read_xattr", 'R'}, 69 { ACL_WRITE_NAMED_ATTRS, "write_xattr", 'W'}, 70 { ACL_READ_ACL, "read_acl", 'c'}, 71 { ACL_WRITE_ACL, "write_acl", 'C'}, 72 { ACL_WRITE_OWNER, "write_owner", 'o'}, 73 { ACL_SYNCHRONIZE, "synchronize", 's'}, 74 { ACL_FULL_SET, "full_set", '\0'}, 75 { ACL_MODIFY_SET, "modify_set", '\0'}, 76 { ACL_READ_SET, "read_set", '\0'}, 77 { ACL_WRITE_SET, "write_set", '\0'}, 78 { 0, 0, 0}}; 79 80 static const char * 81 format_flag(uint32_t *var, const struct flagnames_struct *flags) 82 { 83 84 for (; flags->name != NULL; flags++) { 85 if ((flags->flag & *var) == 0) 86 continue; 87 88 *var &= ~flags->flag; 89 return (flags->name); 90 } 91 92 return (NULL); 93 } 94 95 static int 96 format_flags_verbose(char *str, size_t size, uint32_t var, 97 const struct flagnames_struct *flags) 98 { 99 size_t off = 0; 100 const char *tmp; 101 102 while ((tmp = format_flag(&var, flags)) != NULL) { 103 off += snprintf(str + off, size - off, "%s/", tmp); 104 assert (off < size); 105 } 106 107 /* If there were any flags added... */ 108 if (off > 0) { 109 off--; 110 /* ... then remove the last slash. */ 111 assert(str[off] == '/'); 112 } 113 114 str[off] = '\0'; 115 116 return (0); 117 } 118 119 static int 120 format_flags_compact(char *str, size_t size, uint32_t var, 121 const struct flagnames_struct *flags) 122 { 123 size_t i; 124 125 for (i = 0; flags[i].letter != '\0'; i++) { 126 assert(i < size); 127 if ((flags[i].flag & var) == 0) 128 str[i] = '-'; 129 else 130 str[i] = flags[i].letter; 131 } 132 133 str[i] = '\0'; 134 135 return (0); 136 } 137 138 static int 139 parse_flags_verbose(const char *strp, uint32_t *var, 140 const struct flagnames_struct *flags, const char *flags_name, 141 int *try_compact) 142 { 143 int i, found, ever_found = 0; 144 char *str, *flag; 145 146 str = strdup(strp); 147 *try_compact = 0; 148 *var = 0; 149 150 while (str != NULL) { 151 flag = strsep(&str, "/:"); 152 153 found = 0; 154 for (i = 0; flags[i].name != NULL; i++) { 155 if (strcmp(flags[i].name, flag) == 0) { 156 *var |= flags[i].flag; 157 found = 1; 158 ever_found = 1; 159 } 160 } 161 162 if (!found) { 163 if (ever_found) 164 warnx("malformed ACL: \"%s\" field contains " 165 "invalid flag \"%s\"", flags_name, flag); 166 else 167 *try_compact = 1; 168 free(str); 169 return (-1); 170 } 171 } 172 173 free(str); 174 return (0); 175 } 176 177 static int 178 parse_flags_compact(const char *str, uint32_t *var, 179 const struct flagnames_struct *flags, const char *flags_name) 180 { 181 int i, j, found; 182 183 *var = 0; 184 185 for (i = 0;; i++) { 186 if (str[i] == '\0') 187 return (0); 188 189 /* Ignore minus signs. */ 190 if (str[i] == '-') 191 continue; 192 193 found = 0; 194 195 for (j = 0; flags[j].name != NULL; j++) { 196 if (flags[j].letter == str[i]) { 197 *var |= flags[j].flag; 198 found = 1; 199 break; 200 } 201 } 202 203 if (!found) { 204 warnx("malformed ACL: \"%s\" field contains " 205 "invalid flag \"%c\"", flags_name, str[i]); 206 return (-1); 207 } 208 } 209 } 210 211 int 212 _nfs4_format_flags(char *str, size_t size, acl_flag_t var, int verbose) 213 { 214 215 if (verbose) 216 return (format_flags_verbose(str, size, var, a_flags)); 217 218 return (format_flags_compact(str, size, var, a_flags)); 219 } 220 221 int 222 _nfs4_format_access_mask(char *str, size_t size, acl_perm_t var, int verbose) 223 { 224 225 if (verbose) 226 return (format_flags_verbose(str, size, var, a_access_masks)); 227 228 return (format_flags_compact(str, size, var, a_access_masks)); 229 } 230 231 int 232 _nfs4_parse_flags(const char *str, acl_flag_t *flags) 233 { 234 int error, try_compact; 235 int tmpflags; 236 237 error = parse_flags_verbose(str, &tmpflags, a_flags, "flags", &try_compact); 238 if (error && try_compact) 239 error = parse_flags_compact(str, &tmpflags, a_flags, "flags"); 240 241 *flags = tmpflags; 242 243 return (error); 244 } 245 246 int 247 _nfs4_parse_access_mask(const char *str, acl_perm_t *perms) 248 { 249 int error, try_compact; 250 int tmpperms; 251 252 error = parse_flags_verbose(str, &tmpperms, a_access_masks, 253 "access permissions", &try_compact); 254 if (error && try_compact) 255 error = parse_flags_compact(str, &tmpperms, 256 a_access_masks, "access permissions"); 257 258 *perms = tmpperms; 259 260 return (error); 261 } 262