Line data Source code
1 : /*
2 : * Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan
3 : * (Royal Institute of Technology, Stockholm, Sweden).
4 : * All rights reserved.
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 : *
10 : * 1. Redistributions of source code must retain the above copyright
11 : * notice, this list of conditions and the following disclaimer.
12 : *
13 : * 2. Redistributions in binary form must reproduce the above copyright
14 : * notice, this list of conditions and the following disclaimer in the
15 : * documentation and/or other materials provided with the distribution.
16 : *
17 : * 3. Neither the name of the Institute nor the names of its contributors
18 : * may be used to endorse or promote products derived from this software
19 : * without specific prior written permission.
20 : *
21 : * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 : * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 : * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 : * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 : * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 : * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 : * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 : * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 : * SUCH DAMAGE.
32 : */
33 :
34 : #include "krb5_locl.h"
35 :
36 : static krb5_error_code
37 1316 : copy_hostname(krb5_context context,
38 : const char *orig_hostname,
39 : char **new_hostname)
40 : {
41 1316 : *new_hostname = strdup (orig_hostname);
42 1316 : if (*new_hostname == NULL)
43 0 : return krb5_enomem(context);
44 1316 : strlwr (*new_hostname);
45 1316 : return 0;
46 : }
47 :
48 : /**
49 : * krb5_expand_hostname() tries to make orig_hostname into a more
50 : * canonical one in the newly allocated space returned in
51 : * new_hostname.
52 :
53 : * @param context a Keberos context
54 : * @param orig_hostname hostname to canonicalise.
55 : * @param new_hostname output hostname, caller must free hostname with
56 : * krb5_xfree().
57 : *
58 : * @return Return an error code or 0, see krb5_get_error_message().
59 : *
60 : * @ingroup krb5_support
61 : */
62 :
63 : KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
64 0 : krb5_expand_hostname (krb5_context context,
65 : const char *orig_hostname,
66 : char **new_hostname)
67 : {
68 0 : struct addrinfo *ai, *a, hints;
69 0 : int error;
70 :
71 0 : if ((context->flags & KRB5_CTX_F_DNS_CANONICALIZE_HOSTNAME) == 0)
72 0 : return copy_hostname (context, orig_hostname, new_hostname);
73 :
74 0 : memset (&hints, 0, sizeof(hints));
75 0 : hints.ai_flags = AI_CANONNAME;
76 :
77 0 : error = getaddrinfo (orig_hostname, NULL, &hints, &ai);
78 0 : if (error)
79 0 : return copy_hostname (context, orig_hostname, new_hostname);
80 0 : for (a = ai; a != NULL; a = a->ai_next) {
81 0 : if (a->ai_canonname != NULL) {
82 0 : *new_hostname = strdup (a->ai_canonname);
83 0 : freeaddrinfo (ai);
84 0 : if (*new_hostname == NULL)
85 0 : return krb5_enomem(context);
86 : else
87 0 : return 0;
88 : }
89 : }
90 0 : freeaddrinfo (ai);
91 0 : return copy_hostname (context, orig_hostname, new_hostname);
92 : }
93 :
94 : /*
95 : * handle the case of the hostname being unresolvable and thus identical
96 : */
97 :
98 : static krb5_error_code
99 1316 : vanilla_hostname (krb5_context context,
100 : const char *orig_hostname,
101 : char **new_hostname,
102 : char ***realms)
103 : {
104 0 : krb5_error_code ret;
105 :
106 1316 : ret = copy_hostname (context, orig_hostname, new_hostname);
107 1316 : if (ret)
108 0 : return ret;
109 1316 : strlwr (*new_hostname);
110 :
111 1316 : ret = krb5_get_host_realm (context, *new_hostname, realms);
112 1316 : if (ret) {
113 0 : free (*new_hostname);
114 0 : return ret;
115 : }
116 1316 : return 0;
117 : }
118 :
119 : /**
120 : * krb5_expand_hostname_realms() expands orig_hostname to a name we
121 : * believe to be a hostname in newly allocated space in new_hostname
122 : * and return the realms new_hostname is believed to belong to in
123 : * realms.
124 : *
125 : * @param context a Keberos context
126 : * @param orig_hostname hostname to canonicalise.
127 : * @param new_hostname output hostname, caller must free hostname with
128 : * krb5_xfree().
129 : * @param realms output possible realms, is an array that is terminated
130 : * with NULL. Caller must free with krb5_free_host_realm().
131 : *
132 : * @return Return an error code or 0, see krb5_get_error_message().
133 : *
134 : * @ingroup krb5_support
135 : */
136 :
137 : KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
138 1316 : krb5_expand_hostname_realms (krb5_context context,
139 : const char *orig_hostname,
140 : char **new_hostname,
141 : char ***realms)
142 : {
143 0 : struct addrinfo *ai, *a, hints;
144 0 : int error;
145 1316 : krb5_error_code ret = 0;
146 :
147 1316 : if ((context->flags & KRB5_CTX_F_DNS_CANONICALIZE_HOSTNAME) == 0)
148 1316 : return vanilla_hostname (context, orig_hostname, new_hostname,
149 : realms);
150 :
151 0 : memset (&hints, 0, sizeof(hints));
152 0 : hints.ai_flags = AI_CANONNAME;
153 :
154 0 : error = getaddrinfo (orig_hostname, NULL, &hints, &ai);
155 0 : if (error)
156 0 : return vanilla_hostname (context, orig_hostname, new_hostname,
157 : realms);
158 :
159 0 : for (a = ai; a != NULL; a = a->ai_next) {
160 0 : if (a->ai_canonname != NULL) {
161 0 : ret = copy_hostname (context, a->ai_canonname, new_hostname);
162 0 : if (ret) {
163 0 : freeaddrinfo (ai);
164 0 : return ret;
165 : }
166 0 : strlwr (*new_hostname);
167 0 : ret = krb5_get_host_realm (context, *new_hostname, realms);
168 0 : if (ret == 0) {
169 0 : freeaddrinfo (ai);
170 0 : return 0;
171 : }
172 0 : free (*new_hostname);
173 : }
174 : }
175 0 : freeaddrinfo(ai);
176 0 : return vanilla_hostname (context, orig_hostname, new_hostname, realms);
177 : }
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