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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/*
* Copyright (c) 1997 - 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 "kadm5_locl.h"
RCSID("$Id$");
static struct units acl_units[] = {
{ "all", KADM5_PRIV_ALL },
{ "change-password",KADM5_PRIV_CPW },
{ "cpw", KADM5_PRIV_CPW },
{ "list", KADM5_PRIV_LIST },
{ "delete", KADM5_PRIV_DELETE },
{ "modify", KADM5_PRIV_MODIFY },
{ "add", KADM5_PRIV_ADD },
{ "get", KADM5_PRIV_GET },
{ "get-keys", KADM5_PRIV_GET_KEYS },
{ NULL, 0 }
};
kadm5_ret_t
_kadm5_string_to_privs(const char *s, uint32_t* privs)
{
int flags;
flags = parse_flags(s, acl_units, 0);
if(flags < 0)
return KADM5_FAILURE;
*privs = flags;
return 0;
}
kadm5_ret_t
_kadm5_privs_to_string(uint32_t privs, char *string, size_t len)
{
if(privs == 0)
strlcpy(string, "none", len);
else
unparse_flags(privs, acl_units + 1, string, len);
return 0;
}
/*
* retrieve the right for the current caller on `princ' (NULL means all)
* and store them in `ret_flags'
* return 0 or an error.
*/
static kadm5_ret_t
fetch_acl (kadm5_server_context *context,
krb5_const_principal princ,
unsigned *ret_flags)
{
FILE *f;
krb5_error_code ret = 0;
char buf[256];
*ret_flags = 0;
/* no acl file -> no rights */
f = fopen(context->config.acl_file, "r");
if (f == NULL)
return 0;
while(fgets(buf, sizeof(buf), f) != NULL) {
char *foo = NULL, *p;
krb5_principal this_princ;
unsigned flags = 0;
p = strtok_r(buf, " \t\n", &foo);
if(p == NULL)
continue;
if (*p == '#') /* comment */
continue;
ret = krb5_parse_name(context->context, p, &this_princ);
if(ret)
break;
if(!krb5_principal_compare(context->context,
context->caller, this_princ)) {
krb5_free_principal(context->context, this_princ);
continue;
}
krb5_free_principal(context->context, this_princ);
p = strtok_r(NULL, " \t\n", &foo);
if(p == NULL)
continue;
ret = _kadm5_string_to_privs(p, &flags);
if (ret)
break;
p = strtok_r(NULL, " \t\n", &foo);
if (p == NULL) {
*ret_flags = flags;
break;
}
if (princ != NULL) {
krb5_principal pattern_princ;
krb5_boolean match;
ret = krb5_parse_name (context->context, p, &pattern_princ);
if (ret)
break;
match = krb5_principal_match (context->context,
princ, pattern_princ);
krb5_free_principal (context->context, pattern_princ);
if (match) {
*ret_flags = flags;
break;
}
}
}
fclose(f);
return ret;
}
/*
* set global acl flags in `context' for the current caller.
* return 0 on success or an error
*/
kadm5_ret_t
_kadm5_acl_init(kadm5_server_context *context)
{
krb5_principal princ;
krb5_error_code ret;
ret = krb5_parse_name(context->context, KADM5_ADMIN_SERVICE, &princ);
if (ret)
return ret;
ret = krb5_principal_compare(context->context, context->caller, princ);
krb5_free_principal(context->context, princ);
if(ret != 0) {
context->acl_flags = KADM5_PRIV_ALL;
return 0;
}
return fetch_acl (context, NULL, &context->acl_flags);
}
/*
* check if `flags' allows `op'
* return 0 if OK or an error
*/
static kadm5_ret_t
check_flags (unsigned op,
unsigned flags)
{
unsigned res = ~flags & op;
if(res & KADM5_PRIV_GET)
return KADM5_AUTH_GET;
if(res & KADM5_PRIV_GET_KEYS)
return KADM5_AUTH_GET_KEYS;
if(res & KADM5_PRIV_ADD)
return KADM5_AUTH_ADD;
if(res & KADM5_PRIV_MODIFY)
return KADM5_AUTH_MODIFY;
if(res & KADM5_PRIV_DELETE)
return KADM5_AUTH_DELETE;
if(res & KADM5_PRIV_CPW)
return KADM5_AUTH_CHANGEPW;
if(res & KADM5_PRIV_LIST)
return KADM5_AUTH_LIST;
if(res)
return KADM5_AUTH_INSUFFICIENT;
return 0;
}
/*
* return 0 if the current caller in `context' is allowed to perform
* `op' on `princ' and otherwise an error
* princ == NULL if it's not relevant.
*/
kadm5_ret_t
_kadm5_acl_check_permission(kadm5_server_context *context,
unsigned op,
krb5_const_principal princ)
{
kadm5_ret_t ret;
unsigned princ_flags;
ret = check_flags (op, context->acl_flags);
if (ret == 0)
return ret;
ret = fetch_acl (context, princ, &princ_flags);
if (ret)
return ret;
return check_flags (op, princ_flags);
}
|
