1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2 /* lib/krb5/os/sn2princ.c */
4 * Copyright 1991,2002 by the Massachusetts Institute of Technology.
7 * Export of this software from the United States of America may
8 * require a specific license from the United States Government.
9 * It is the responsibility of any person or organization contemplating
10 * export to obtain such a license before exporting.
12 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
13 * distribute this software and its documentation for any purpose and
14 * without fee is hereby granted, provided that the above copyright
15 * notice appear in all copies and that both that copyright notice and
16 * this permission notice appear in supporting documentation, and that
17 * the name of M.I.T. not be used in advertising or publicity pertaining
18 * to distribution of the software without specific, written prior
19 * permission. Furthermore if you modify this software you must label
20 * your software as modified software and not distribute it in such a
21 * fashion that it might be confused with the original M.I.T. software.
22 * M.I.T. makes no representations about the suitability of
23 * this software for any purpose. It is provided "as is" without express
24 * or implied warranty.
27 /* Convert a hostname and service name to a principal in the "standard"
32 #include "fake-addrinfo.h"
34 #ifdef HAVE_SYS_PARAM_H
35 #include <sys/param.h>
38 #if !defined(DEFAULT_RDNS_LOOKUP)
39 #define DEFAULT_RDNS_LOOKUP 1
43 maybe_use_reverse_dns (krb5_context context, int defalt)
49 code = profile_get_string(context->profile, KRB5_CONF_LIBDEFAULTS,
50 KRB5_CONF_RDNS, 0, 0, &value);
57 use_rdns = _krb5_conf_boolean(value);
58 profile_release_string(value);
63 krb5_error_code KRB5_CALLCONV
64 krb5_sname_to_principal(krb5_context context, const char *hostname, const char *sname, krb5_int32 type, krb5_principal *ret_princ)
66 char **hrealms, *realm, *remote_host;
67 krb5_error_code retval;
69 char localname[MAXHOSTNAMELEN];
71 TRACE_SNAME_TO_PRINCIPAL(context, hostname, sname, type);
73 if ((type == KRB5_NT_UNKNOWN) ||
74 (type == KRB5_NT_SRV_HST)) {
76 /* if hostname is NULL, use local hostname */
78 if (gethostname(localname, MAXHOSTNAMELEN))
83 /* if sname is NULL, use "host" */
87 /* copy the hostname into non-volatile storage */
89 if (type == KRB5_NT_SRV_HST) {
90 struct addrinfo *ai = NULL, hints;
92 char hnamebuf[NI_MAXHOST];
94 /* Note that the old code would accept numeric addresses,
95 and if the gethostbyaddr step could convert them to
96 real hostnames, you could actually get reasonable
97 results. If the mapping failed, you'd get dotted
98 triples as realm names. *sigh*
100 The latter has been fixed in hst_realm.c, but we should
101 keep supporting numeric addresses if they do have
102 hostnames associated. */
104 memset(&hints, 0, sizeof(hints));
105 hints.ai_flags = AI_CANONNAME;
106 err = getaddrinfo(hostname, 0, &hints, &ai);
108 TRACE_SNAME_TO_PRINCIPAL_NOCANON(context, hostname);
110 remote_host = strdup((ai && ai->ai_canonname) ? ai->ai_canonname : hostname);
116 TRACE_SNAME_TO_PRINCIPAL_CANON(context, remote_host);
117 if ((!err) && maybe_use_reverse_dns(context, DEFAULT_RDNS_LOOKUP)) {
119 * Do a reverse resolution to get the full name, just in
120 * case there's some funny business going on. If there
121 * isn't an in-addr record, give up.
123 /* XXX: This is *so* bogus. There are several cases where
124 this won't get us the canonical name of the host, but
125 this is what we've trained people to expect. We'll
126 probably fix it at some point, but let's try to
127 preserve the current behavior and only shake things up
128 once when it comes time to fix this lossage. */
129 err = getnameinfo(ai->ai_addr, ai->ai_addrlen,
130 hnamebuf, sizeof(hnamebuf), 0, 0, NI_NAMEREQD);
134 remote_host = strdup(hnamebuf);
140 } else /* type == KRB5_NT_UNKNOWN */ {
141 remote_host = strdup(hostname);
145 TRACE_SNAME_TO_PRINCIPAL_RDNS(context, remote_host);
147 if (type == KRB5_NT_SRV_HST)
148 for (cp = remote_host; *cp; cp++)
149 if (isupper((unsigned char) (*cp)))
150 *cp = tolower((unsigned char) (*cp));
153 * Windows NT5's broken resolver gratuitously tacks on a
154 * trailing period to the hostname (at least it does in
155 * Beta2). Find and remove it.
157 if (remote_host[0]) {
158 cp = remote_host + strlen(remote_host)-1;
164 if ((retval = krb5_get_host_realm(context, remote_host, &hrealms))) {
172 return KRB5_ERR_HOST_REALM_UNKNOWN;
176 retval = krb5_build_principal(context, ret_princ, strlen(realm),
177 realm, sname, remote_host,
180 krb5_princ_type(context, *ret_princ) = type;
182 TRACE_SNAME_TO_PRINCIPAL_RETURN(context, *ret_princ);
186 krb5_free_host_realm(context, hrealms);
189 return KRB5_SNAME_UNSUPP_NAMETYPE;