1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2012 The FreeBSD Foundation
5 *
6 * This software was developed by Edward Tomasz Napierala under sponsorship
7 * from the FreeBSD Foundation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #include <ctype.h>
32 #include <string.h>
33
34 #include "libiscsiutil.h"
35
36 #define MAX_NAME_LEN 223
37
38 char *
checked_strdup(const char * s)39 checked_strdup(const char *s)
40 {
41 char *c;
42
43 c = strdup(s);
44 if (c == NULL)
45 log_err(1, "strdup");
46 return (c);
47 }
48
49 bool
valid_iscsi_name(const char * name,void (* warn_fn)(const char *,...))50 valid_iscsi_name(const char *name, void (*warn_fn)(const char *, ...))
51 {
52 int i;
53
54 if (strlen(name) >= MAX_NAME_LEN) {
55 warn_fn("overlong name for target \"%s\"; max length allowed "
56 "by iSCSI specification is %d characters",
57 name, MAX_NAME_LEN);
58 return (false);
59 }
60
61 /*
62 * In the cases below, we don't return an error, just in case the admin
63 * was right, and we're wrong.
64 */
65 if (strncasecmp(name, "iqn.", strlen("iqn.")) == 0) {
66 for (i = strlen("iqn."); name[i] != '\0'; i++) {
67 /*
68 * XXX: We should verify UTF-8 normalisation, as defined
69 * by 3.2.6.2: iSCSI Name Encoding.
70 */
71 if (isalnum(name[i]))
72 continue;
73 if (name[i] == '-' || name[i] == '.' || name[i] == ':')
74 continue;
75 warn_fn("invalid character \"%c\" in target name "
76 "\"%s\"; allowed characters are letters, digits, "
77 "'-', '.', and ':'", name[i], name);
78 break;
79 }
80 /*
81 * XXX: Check more stuff: valid date and a valid reversed domain.
82 */
83 } else if (strncasecmp(name, "eui.", strlen("eui.")) == 0) {
84 if (strlen(name) != strlen("eui.") + 16)
85 warn_fn("invalid target name \"%s\"; the \"eui.\" "
86 "should be followed by exactly 16 hexadecimal "
87 "digits", name);
88 for (i = strlen("eui."); name[i] != '\0'; i++) {
89 if (!isxdigit(name[i])) {
90 warn_fn("invalid character \"%c\" in target "
91 "name \"%s\"; allowed characters are 1-9 "
92 "and A-F", name[i], name);
93 break;
94 }
95 }
96 } else if (strncasecmp(name, "naa.", strlen("naa.")) == 0) {
97 if (strlen(name) > strlen("naa.") + 32)
98 warn_fn("invalid target name \"%s\"; the \"naa.\" "
99 "should be followed by at most 32 hexadecimal "
100 "digits", name);
101 for (i = strlen("naa."); name[i] != '\0'; i++) {
102 if (!isxdigit(name[i])) {
103 warn_fn("invalid character \"%c\" in target "
104 "name \"%s\"; allowed characters are 1-9 "
105 "and A-F", name[i], name);
106 break;
107 }
108 }
109 } else {
110 warn_fn("invalid target name \"%s\"; should start with "
111 "either \"iqn.\", \"eui.\", or \"naa.\"",
112 name);
113 }
114 return (true);
115 }
116