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
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
|
/* Authors: Rob Crittenden <rcritten@redhat.com>
*
* Copyright (C) 2009 Red Hat
* see file 'COPYING' for use and warranty information
*
* This program is free software you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <krb5.h>
#include <popt.h>
#include <errno.h>
#include "ipa-client-common.h"
#include "config.h"
int
remove_principal(krb5_context context, krb5_keytab ktid, const char *principal, int debug)
{
krb5_error_code krberr;
krb5_keytab_entry entry, entry2;
int rval = 0;
int removed = 0;
memset(&entry, 0, sizeof(entry));
krberr = krb5_parse_name(context, principal, &entry.principal);
if (krberr) {
fprintf(stderr, _("Unable to parse principal name\n"));
if (debug)
fprintf(stderr, _("krb5_parse_name %d: %s\n"),
krberr, error_message(krberr));
rval = 4;
goto done;
}
/* Loop through the keytab and remove all entries with this principal name
* irrespective of the encryption type. A failure to find one after the
* first means we're done.
*/
fprintf(stderr, _("Removing principal %s\n"), principal);
while (1) {
memset(&entry2, 0, sizeof(entry2));
krberr = krb5_kt_get_entry(context, ktid,
entry.principal,
0,
0,
&entry2);
if (krberr) {
if (removed > 0)
/* not found but we've removed some, we're done */
break;
if (krberr == ENOENT) {
fprintf(stderr, _("Failed to open keytab\n"));
rval = 3;
goto done;
}
fprintf(stderr, _("principal not found\n"));
if (debug)
fprintf(stderr, _("krb5_kt_get_entry %d: %s\n"),
krberr, error_message(krberr));
rval = 5;
break;
}
krberr = krb5_kt_remove_entry(context, ktid, &entry2);
if (krberr) {
fprintf(stderr, _("Unable to remove entry\n"));
if (debug) {
fprintf(stdout, _("kvno %d\n"), entry2.vno);
fprintf(stderr, _("krb5_kt_remove_entry %d: %s\n"),
krberr, error_message(krberr));
}
rval = 6;
break;
}
krb5_free_keytab_entry_contents(context, &entry2);
removed++;
}
if (entry2.principal)
krb5_free_keytab_entry_contents(context, &entry2);
done:
return rval;
}
int
remove_realm(krb5_context context, krb5_keytab ktid, const char *realm, int debug)
{
krb5_error_code krberr;
krb5_keytab_entry entry;
krb5_kt_cursor kt_cursor;
char * entry_princ_s = NULL;
int rval = 0;
krberr = krb5_kt_start_seq_get(context, ktid, &kt_cursor);
memset(&entry, 0, sizeof(entry));
while (krb5_kt_next_entry(context, ktid, &entry, &kt_cursor) == 0) {
krberr = krb5_unparse_name(context, entry.principal, &entry_princ_s);
if (krberr) {
fprintf(stderr, _("Unable to parse principal\n"));
if (debug) {
fprintf(stderr, _("krb5_unparse_name %d: %s\n"),
krberr, error_message(krberr));
}
rval = 4;
goto done;
}
/* keytab entries are locked when looping. Temporarily suspend
* the looping. */
krb5_kt_end_seq_get(context, ktid, &kt_cursor);
if (strstr(entry_princ_s, realm) != NULL) {
rval = remove_principal(context, ktid, entry_princ_s, debug);
if (rval != 0)
goto done;
/* Have to reset the cursor */
krberr = krb5_kt_start_seq_get(context, ktid, &kt_cursor);
}
}
done:
return rval;
}
int
main(int argc, const char **argv)
{
krb5_context context;
krb5_error_code krberr;
krb5_keytab ktid;
krb5_kt_cursor cursor;
char * ktname = NULL;
char * atrealm = NULL;
poptContext pc;
static const char *keytab = NULL;
static const char *principal = NULL;
static const char *realm = NULL;
int debug = 0;
int ret, rval = 0;
struct poptOption options[] = {
{ "debug", 'd', POPT_ARG_NONE, &debug, 0,
_("Print debugging information"), _("Debugging output") },
{ "principal", 'p', POPT_ARG_STRING, &principal, 0,
_("The principal to get a keytab for (ex: ftp/ftp.example.com@EXAMPLE.COM)"),
_("Kerberos Service Principal Name") },
{ "keytab", 'k', POPT_ARG_STRING, &keytab, 0,
_("File were to store the keytab information"), _("Keytab File Name") },
{ "realm", 'r', POPT_ARG_STRING, &realm, 0,
_("Remove all principals in this realm"), _("Realm name") },
POPT_AUTOHELP
POPT_TABLEEND
};
ret = init_gettext();
if (ret) {
exit(1);
}
memset(&ktid, 0, sizeof(ktid));
krberr = krb5_init_context(&context);
if (krberr) {
fprintf(stderr, _("Kerberos context initialization failed\n"));
exit(1);
}
pc = poptGetContext("ipa-rmkeytab", argc, (const char **)argv, options, 0);
ret = poptGetNextOpt(pc);
if (ret != -1 || (!principal && !realm) || !keytab) {
poptPrintUsage(pc, stderr, 0);
rval = 1;
goto cleanup;
}
ret = asprintf(&ktname, "WRFILE:%s", keytab);
if (ret == -1) {
rval = 2;
goto cleanup;
}
/* The remove_realm function just does a substring match. Ensure that
* the string we pass in looks like a realm.
*/
if (realm) {
if (realm[0] != '@') {
ret = asprintf(&atrealm, "@%s", realm);
if (ret == -1) {
rval = 2;
goto cleanup;
}
} else {
atrealm = strdup(realm);
if (NULL == atrealm) {
rval = 2;
goto cleanup;
}
}
}
krberr = krb5_kt_resolve(context, ktname, &ktid);
if (krberr) {
fprintf(stderr, _("Failed to open keytab '%s': %s\n"), keytab,
error_message(krberr));
rval = 3;
goto cleanup;
}
krberr = krb5_kt_start_seq_get(context, ktid, &cursor);
if (krberr) {
fprintf(stderr, _("Failed to open keytab '%s': %s\n"), keytab,
error_message(krberr));
rval = 3;
goto cleanup;
}
krb5_kt_end_seq_get(context, ktid, &cursor);
if (principal)
rval = remove_principal(context, ktid, principal, debug);
else if (realm)
rval = remove_realm(context, ktid, atrealm, debug);
cleanup:
if (rval == 0 || rval > 3) {
krberr = krb5_kt_close(context, ktid);
if (krberr) {
fprintf(stderr, _("Closing keytab failed\n"));
if (debug)
fprintf(stderr, _("krb5_kt_close %d: %s\n"),
krberr, error_message(krberr));
}
}
krb5_free_context(context);
poptFreeContext(pc);
free(atrealm);
free(ktname);
return rval;
}
|
