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 1541 : copy_hostname(krb5_context context,
38 : const char *orig_hostname,
39 : char **new_hostname)
40 : {
41 1541 : *new_hostname = strdup (orig_hostname);
42 1541 : if (*new_hostname == NULL) {
43 0 : krb5_set_error_message(context, ENOMEM,
44 0 : N_("malloc: out of memory", ""));
45 0 : return ENOMEM;
46 : }
47 1541 : strlwr (*new_hostname);
48 1541 : return 0;
49 : }
50 :
51 : /**
52 : * krb5_expand_hostname() tries to make orig_hostname into a more
53 : * canonical one in the newly allocated space returned in
54 : * new_hostname.
55 :
56 : * @param context a Keberos context
57 : * @param orig_hostname hostname to canonicalise.
58 : * @param new_hostname output hostname, caller must free hostname with
59 : * krb5_xfree().
60 : *
61 : * @return Return an error code or 0, see krb5_get_error_message().
62 : *
63 : * @ingroup krb5_support
64 : */
65 :
66 : KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
67 0 : krb5_expand_hostname (krb5_context context,
68 : const char *orig_hostname,
69 : char **new_hostname)
70 : {
71 : struct addrinfo *ai, *a, hints;
72 : int error;
73 :
74 0 : if ((context->flags & KRB5_CTX_F_DNS_CANONICALIZE_HOSTNAME) == 0)
75 0 : return copy_hostname (context, orig_hostname, new_hostname);
76 :
77 0 : memset (&hints, 0, sizeof(hints));
78 0 : hints.ai_flags = AI_CANONNAME;
79 :
80 0 : error = getaddrinfo (orig_hostname, NULL, &hints, &ai);
81 0 : if (error)
82 0 : return copy_hostname (context, orig_hostname, new_hostname);
83 0 : for (a = ai; a != NULL; a = a->ai_next) {
84 0 : if (a->ai_canonname != NULL) {
85 0 : *new_hostname = strdup (a->ai_canonname);
86 0 : freeaddrinfo (ai);
87 0 : if (*new_hostname == NULL) {
88 0 : krb5_set_error_message(context, ENOMEM,
89 0 : N_("malloc: out of memory", ""));
90 0 : return ENOMEM;
91 : } else {
92 0 : return 0;
93 : }
94 : }
95 : }
96 0 : freeaddrinfo (ai);
97 0 : return copy_hostname (context, orig_hostname, new_hostname);
98 : }
99 :
100 : /*
101 : * handle the case of the hostname being unresolvable and thus identical
102 : */
103 :
104 : static krb5_error_code
105 1541 : vanilla_hostname (krb5_context context,
106 : const char *orig_hostname,
107 : char **new_hostname,
108 : char ***realms)
109 : {
110 : krb5_error_code ret;
111 :
112 1541 : ret = copy_hostname (context, orig_hostname, new_hostname);
113 1541 : if (ret)
114 0 : return ret;
115 1541 : strlwr (*new_hostname);
116 :
117 1541 : ret = krb5_get_host_realm (context, *new_hostname, realms);
118 1541 : if (ret) {
119 0 : free (*new_hostname);
120 0 : return ret;
121 : }
122 1541 : return 0;
123 : }
124 :
125 : /**
126 : * krb5_expand_hostname_realms() expands orig_hostname to a name we
127 : * believe to be a hostname in newly allocated space in new_hostname
128 : * and return the realms new_hostname is believed to belong to in
129 : * realms.
130 : *
131 : * @param context a Keberos context
132 : * @param orig_hostname hostname to canonicalise.
133 : * @param new_hostname output hostname, caller must free hostname with
134 : * krb5_xfree().
135 : * @param realms output possible realms, is an array that is terminated
136 : * with NULL. Caller must free with krb5_free_host_realm().
137 : *
138 : * @return Return an error code or 0, see krb5_get_error_message().
139 : *
140 : * @ingroup krb5_support
141 : */
142 :
143 : KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
144 1541 : krb5_expand_hostname_realms (krb5_context context,
145 : const char *orig_hostname,
146 : char **new_hostname,
147 : char ***realms)
148 : {
149 : struct addrinfo *ai, *a, hints;
150 : int error;
151 1541 : krb5_error_code ret = 0;
152 :
153 1541 : if ((context->flags & KRB5_CTX_F_DNS_CANONICALIZE_HOSTNAME) == 0)
154 1541 : return vanilla_hostname (context, orig_hostname, new_hostname,
155 : realms);
156 :
157 0 : memset (&hints, 0, sizeof(hints));
158 0 : hints.ai_flags = AI_CANONNAME;
159 :
160 0 : error = getaddrinfo (orig_hostname, NULL, &hints, &ai);
161 0 : if (error)
162 0 : return vanilla_hostname (context, orig_hostname, new_hostname,
163 : realms);
164 :
165 0 : for (a = ai; a != NULL; a = a->ai_next) {
166 0 : if (a->ai_canonname != NULL) {
167 0 : ret = copy_hostname (context, a->ai_canonname, new_hostname);
168 0 : if (ret) {
169 0 : freeaddrinfo (ai);
170 0 : return ret;
171 : }
172 0 : strlwr (*new_hostname);
173 0 : ret = krb5_get_host_realm (context, *new_hostname, realms);
174 0 : if (ret == 0) {
175 0 : freeaddrinfo (ai);
176 0 : return 0;
177 : }
178 0 : free (*new_hostname);
179 : }
180 : }
181 0 : freeaddrinfo(ai);
182 0 : return vanilla_hostname (context, orig_hostname, new_hostname, realms);
183 : }
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