1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2008, 2009 Edward Tomasz Napierała <trasz@FreeBSD.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <stdio.h> 32 #include <stdlib.h> 33 #include <unistd.h> 34 #include <errno.h> 35 #include <assert.h> 36 #include <string.h> 37 #include <pwd.h> 38 #include <grp.h> 39 #include <ctype.h> 40 #include <err.h> 41 #include <sys/syscall.h> 42 #include <sys/types.h> 43 #include <sys/acl.h> 44 45 #include "acl_support.h" 46 47 #define MAX_ENTRY_LENGTH 512 48 49 /* 50 * Parse the tag field of ACL entry passed as "str". If qualifier 51 * needs to follow, then the variable referenced by "need_qualifier" 52 * is set to 1, otherwise it's set to 0. 53 */ 54 static int 55 parse_tag(const char *str, acl_entry_t entry, int *need_qualifier) 56 { 57 58 assert(need_qualifier != NULL); 59 *need_qualifier = 0; 60 61 if (strcmp(str, "owner@") == 0) 62 return (acl_set_tag_type(entry, ACL_USER_OBJ)); 63 if (strcmp(str, "group@") == 0) 64 return (acl_set_tag_type(entry, ACL_GROUP_OBJ)); 65 if (strcmp(str, "everyone@") == 0) 66 return (acl_set_tag_type(entry, ACL_EVERYONE)); 67 68 *need_qualifier = 1; 69 70 if (strcmp(str, "user") == 0 || strcmp(str, "u") == 0) 71 return (acl_set_tag_type(entry, ACL_USER)); 72 if (strcmp(str, "group") == 0 || strcmp(str, "g") == 0) 73 return (acl_set_tag_type(entry, ACL_GROUP)); 74 75 warnx("malformed ACL: invalid \"tag\" field"); 76 77 return (-1); 78 } 79 80 /* 81 * Parse the qualifier field of ACL entry passed as "str". 82 * If user or group name cannot be resolved, then the variable 83 * referenced by "need_qualifier" is set to 1; it will be checked 84 * later to figure out whether the appended_id is required. 85 */ 86 static int 87 parse_qualifier(char *str, acl_entry_t entry, int *need_qualifier) 88 { 89 int qualifier_length, error; 90 uid_t id; 91 acl_tag_t tag; 92 93 assert(need_qualifier != NULL); 94 *need_qualifier = 0; 95 96 qualifier_length = strlen(str); 97 98 if (qualifier_length == 0) { 99 warnx("malformed ACL: empty \"qualifier\" field"); 100 return (-1); 101 } 102 103 error = acl_get_tag_type(entry, &tag); 104 if (error) 105 return (error); 106 107 error = _acl_name_to_id(tag, str, &id); 108 if (error) { 109 *need_qualifier = 1; 110 return (0); 111 } 112 113 return (acl_set_qualifier(entry, &id)); 114 } 115 116 static int 117 parse_access_mask(char *str, acl_entry_t entry) 118 { 119 int error; 120 acl_perm_t perm; 121 122 error = _nfs4_parse_access_mask(str, &perm); 123 if (error) 124 return (error); 125 126 error = acl_set_permset(entry, &perm); 127 128 return (error); 129 } 130 131 static int 132 parse_flags(char *str, acl_entry_t entry) 133 { 134 int error; 135 acl_flag_t flags; 136 137 error = _nfs4_parse_flags(str, &flags); 138 if (error) 139 return (error); 140 141 error = acl_set_flagset_np(entry, &flags); 142 143 return (error); 144 } 145 146 static int 147 parse_entry_type(const char *str, acl_entry_t entry) 148 { 149 150 if (strcmp(str, "allow") == 0) 151 return (acl_set_entry_type_np(entry, ACL_ENTRY_TYPE_ALLOW)); 152 if (strcmp(str, "deny") == 0) 153 return (acl_set_entry_type_np(entry, ACL_ENTRY_TYPE_DENY)); 154 if (strcmp(str, "audit") == 0) 155 return (acl_set_entry_type_np(entry, ACL_ENTRY_TYPE_AUDIT)); 156 if (strcmp(str, "alarm") == 0) 157 return (acl_set_entry_type_np(entry, ACL_ENTRY_TYPE_ALARM)); 158 159 warnx("malformed ACL: invalid \"type\" field"); 160 161 return (-1); 162 } 163 164 static int 165 parse_appended_id(char *str, acl_entry_t entry) 166 { 167 int qualifier_length; 168 char *end; 169 id_t id; 170 171 qualifier_length = strlen(str); 172 if (qualifier_length == 0) { 173 warnx("malformed ACL: \"appended id\" field present, " 174 "but empty"); 175 return (-1); 176 } 177 178 id = strtod(str, &end); 179 if (end - str != qualifier_length) { 180 warnx("malformed ACL: appended id is not a number"); 181 return (-1); 182 } 183 184 return (acl_set_qualifier(entry, &id)); 185 } 186 187 static int 188 number_of_colons(const char *str) 189 { 190 int count = 0; 191 192 while (*str != '\0') { 193 if (*str == ':') 194 count++; 195 196 str++; 197 } 198 199 return (count); 200 } 201 202 int 203 _nfs4_acl_entry_from_text(acl_t aclp, char *str) 204 { 205 int error, need_qualifier; 206 acl_entry_t entry; 207 char *field, *qualifier_field; 208 209 error = acl_create_entry(&aclp, &entry); 210 if (error) 211 return (error); 212 213 assert(_entry_brand(entry) == ACL_BRAND_NFS4); 214 215 if (str == NULL) 216 goto truncated_entry; 217 field = strsep(&str, ":"); 218 219 field = string_skip_whitespace(field); 220 if ((*field == '\0') && (!str)) { 221 /* 222 * Is an entirely comment line, skip to next 223 * comma. 224 */ 225 return (0); 226 } 227 228 error = parse_tag(field, entry, &need_qualifier); 229 if (error) 230 goto malformed_field; 231 232 if (need_qualifier) { 233 if (str == NULL) 234 goto truncated_entry; 235 qualifier_field = field = strsep(&str, ":"); 236 error = parse_qualifier(field, entry, &need_qualifier); 237 if (error) 238 goto malformed_field; 239 } 240 241 if (str == NULL) 242 goto truncated_entry; 243 field = strsep(&str, ":"); 244 error = parse_access_mask(field, entry); 245 if (error) 246 goto malformed_field; 247 248 if (str == NULL) 249 goto truncated_entry; 250 /* Do we have "flags" field? */ 251 if (number_of_colons(str) > 0) { 252 field = strsep(&str, ":"); 253 error = parse_flags(field, entry); 254 if (error) 255 goto malformed_field; 256 } 257 258 if (str == NULL) 259 goto truncated_entry; 260 field = strsep(&str, ":"); 261 error = parse_entry_type(field, entry); 262 if (error) 263 goto malformed_field; 264 265 if (need_qualifier) { 266 if (str == NULL) { 267 warnx("malformed ACL: unknown user or group name " 268 "\"%s\"", qualifier_field); 269 goto truncated_entry; 270 } 271 272 error = parse_appended_id(str, entry); 273 if (error) 274 goto malformed_field; 275 } 276 277 return (0); 278 279 truncated_entry: 280 malformed_field: 281 acl_delete_entry(aclp, entry); 282 errno = EINVAL; 283 return (-1); 284 } 285