1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
/*
* Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "krb5_locl.h"
static krb5_error_code
copy_hostname(krb5_context context,
const char *orig_hostname,
char **new_hostname)
{
*new_hostname = strdup (orig_hostname);
if (*new_hostname == NULL) {
krb5_set_error_message(context, ENOMEM,
N_("malloc: out of memory", ""));
return ENOMEM;
}
strlwr (*new_hostname);
return 0;
}
/**
* krb5_expand_hostname() tries to make orig_hostname into a more
* canonical one in the newly allocated space returned in
* new_hostname.
* @param context a Keberos context
* @param orig_hostname hostname to canonicalise.
* @param new_hostname output hostname, caller must free hostname with
* krb5_xfree().
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_support
*/
krb5_error_code KRB5_LIB_FUNCTION
krb5_expand_hostname (krb5_context context,
const char *orig_hostname,
char **new_hostname)
{
struct addrinfo *ai, *a, hints;
int error;
if ((context->flags & KRB5_CTX_F_DNS_CANONICALIZE_HOSTNAME) == 0)
return copy_hostname (context, orig_hostname, new_hostname);
memset (&hints, 0, sizeof(hints));
hints.ai_flags = AI_CANONNAME;
error = getaddrinfo (orig_hostname, NULL, &hints, &ai);
if (error)
return copy_hostname (context, orig_hostname, new_hostname);
for (a = ai; a != NULL; a = a->ai_next) {
if (a->ai_canonname != NULL) {
*new_hostname = strdup (a->ai_canonname);
freeaddrinfo (ai);
if (*new_hostname == NULL) {
krb5_set_error_message(context, ENOMEM,
N_("malloc: out of memory", ""));
return ENOMEM;
} else {
return 0;
}
}
}
freeaddrinfo (ai);
return copy_hostname (context, orig_hostname, new_hostname);
}
/*
* handle the case of the hostname being unresolvable and thus identical
*/
static krb5_error_code
vanilla_hostname (krb5_context context,
const char *orig_hostname,
char **new_hostname,
char ***realms)
{
krb5_error_code ret;
ret = copy_hostname (context, orig_hostname, new_hostname);
if (ret)
return ret;
strlwr (*new_hostname);
ret = krb5_get_host_realm (context, *new_hostname, realms);
if (ret) {
free (*new_hostname);
return ret;
}
return 0;
}
/**
* krb5_expand_hostname_realms() expands orig_hostname to a name we
* believe to be a hostname in newly allocated space in new_hostname
* and return the realms new_hostname is believed to belong to in
* realms.
*
* @param context a Keberos context
* @param orig_hostname hostname to canonicalise.
* @param new_hostname output hostname, caller must free hostname with
* krb5_xfree().
* @param realms output possible realms, is an array that is terminated
* with NULL. Caller must free with krb5_free_host_realm().
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_support
*/
krb5_error_code KRB5_LIB_FUNCTION
krb5_expand_hostname_realms (krb5_context context,
const char *orig_hostname,
char **new_hostname,
char ***realms)
{
struct addrinfo *ai, *a, hints;
int error;
krb5_error_code ret = 0;
if ((context->flags & KRB5_CTX_F_DNS_CANONICALIZE_HOSTNAME) == 0)
return vanilla_hostname (context, orig_hostname, new_hostname,
realms);
memset (&hints, 0, sizeof(hints));
hints.ai_flags = AI_CANONNAME;
error = getaddrinfo (orig_hostname, NULL, &hints, &ai);
if (error)
return vanilla_hostname (context, orig_hostname, new_hostname,
realms);
for (a = ai; a != NULL; a = a->ai_next) {
if (a->ai_canonname != NULL) {
ret = copy_hostname (context, a->ai_canonname, new_hostname);
if (ret) {
freeaddrinfo (ai);
return ret;
}
strlwr (*new_hostname);
ret = krb5_get_host_realm (context, *new_hostname, realms);
if (ret == 0) {
freeaddrinfo (ai);
return 0;
}
free (*new_hostname);
}
}
freeaddrinfo(ai);
return vanilla_hostname (context, orig_hostname, new_hostname, realms);
}
|
