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DEFINITIONS
This source file includes following definitions.
- get_env_user
- _krb5_get_default_principal_local
- krb5_get_default_principal
1 /*
2 * Copyright (c) 1997 - 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 RCSID("$Id$");
37
38 /*
39 * Try to find out what's a reasonable default principal.
40 */
41
42 static const char*
43 get_env_user(void)
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44 {
45 const char *user = getenv("USER");
46 if(user == NULL)
47 user = getenv("LOGNAME");
48 if(user == NULL)
49 user = getenv("USERNAME");
50 return user;
51 }
52
53 /*
54 * Will only use operating-system dependant operation to get the
55 * default principal, for use of functions that in ccache layer to
56 * avoid recursive calls.
57 */
58
59 krb5_error_code
60 _krb5_get_default_principal_local (krb5_context context,
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61 krb5_principal *princ)
62 {
63 krb5_error_code ret;
64 const char *user;
65 uid_t uid;
66
67 *princ = NULL;
68
69 uid = getuid();
70 if(uid == 0) {
71 user = getlogin();
72 if(user == NULL)
73 user = get_env_user();
74 if(user != NULL && strcmp(user, "root") != 0)
75 ret = krb5_make_principal(context, princ, NULL, user, "root", NULL);
76 else
77 ret = krb5_make_principal(context, princ, NULL, "root", NULL);
78 } else {
79 struct passwd *pw = getpwuid(uid);
80 if(pw != NULL)
81 user = pw->pw_name;
82 else {
83 user = get_env_user();
84 if(user == NULL)
85 user = getlogin();
86 }
87 if(user == NULL) {
88 krb5_set_error_message(context, ENOTTY,
89 N_("unable to figure out current "
90 "principal", ""));
91 return ENOTTY; /* XXX */
92 }
93 ret = krb5_make_principal(context, princ, NULL, user, NULL);
94 }
95 return ret;
96 }
97
98 krb5_error_code KRB5_LIB_FUNCTION
99 krb5_get_default_principal (krb5_context context,
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100 krb5_principal *princ)
101 {
102 krb5_error_code ret;
103 krb5_ccache id;
104
105 *princ = NULL;
106
107 ret = krb5_cc_default (context, &id);
108 if (ret == 0) {
109 ret = krb5_cc_get_principal (context, id, princ);
110 krb5_cc_close (context, id);
111 if (ret == 0)
112 return 0;
113 }
114
115 return _krb5_get_default_principal_local(context, princ);
116 }