Bug Summary

File:client/ipa-rmkeytab.c
Warning:line 138, column 13
Value stored to 'krberr' is never read

Annotated Source Code

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clang -cc1 -triple x86_64-unknown-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name ipa-rmkeytab.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model static -mthread-model posix -mframe-pointer=all -fmath-errno -fno-rounding-math -masm-verbose -mconstructor-aliases -munwind-tables -target-cpu x86-64 -dwarf-column-info -fno-split-dwarf-inlining -debugger-tuning=gdb -resource-dir /usr/lib64/clang/10.0.0 -D HAVE_CONFIG_H -I . -I .. -I . -I ../util -I ../asn1 -D PREFIX="/usr/local" -D BINDIR="/usr/local/bin" -D LIBDIR="/usr/local/lib" -D LIBEXECDIR="/usr/local/libexec" -D DATADIR="/usr/local/share" -D LOCALEDIR="/usr/local/share/locale" -D IPACONFFILE="/usr/local/etc/ipa/default.conf" -I /usr/include/nspr4 -I /usr/include/nss3 -I /usr/include/nspr4 -D __STDC_WANT_LIB_EXT1__=1 -D _DEFAULT_SOURCE=1 -D _POSIX_C_SOURCE=200809L -internal-isystem /usr/local/include -internal-isystem /usr/lib64/clang/10.0.0/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -fdebug-compilation-dir /home/heimes/redhat/freeipa/client -ferror-limit 19 -fmessage-length 0 -fgnuc-version=4.2.1 -fobjc-runtime=gcc -fdiagnostics-show-option -analyzer-output=html -faddrsig -o /home/heimes/redhat/freeipa/report/2020-06-05-101548-295465-1 -x c ipa-rmkeytab.c
1/* Authors: Rob Crittenden <rcritten@redhat.com>
2 *
3 * Copyright (C) 2009 Red Hat
4 * see file 'COPYING' for use and warranty information
5 *
6 * This program is free software you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20#define _GNU_SOURCE
21#include <stdlib.h>
22#include <stdbool.h>
23#include <stdio.h>
24#include <string.h>
25#include <krb5.h>
26#include <popt.h>
27#include <errno(*__errno_location ()).h>
28
29#include "ipa-client-common.h"
30#include "config.h"
31
32int
33remove_principal(krb5_context context, krb5_keytab ktid, const char *principal, int debug)
34{
35 krb5_error_code krberr;
36 krb5_keytab_entry entry, entry2;
37 int rval = 0;
38 int removed = 0;
39
40 memset(&entry, 0, sizeof(entry));
41 krberr = krb5_parse_name(context, principal, &entry.principal);
42 if (krberr) {
43 fprintf(stderrstderr, _("Unable to parse principal name\n")gettext("Unable to parse principal name\n"));
44 if (debug)
45 fprintf(stderrstderr, _("krb5_parse_name %1$d: %2$s\n")gettext("krb5_parse_name %1$d: %2$s\n"),
46 krberr, error_message(krberr));
47 rval = 4;
48 goto done;
49 }
50
51 /* Loop through the keytab and remove all entries with this principal name
52 * irrespective of the encryption type. A failure to find one after the
53 * first means we're done.
54 */
55 fprintf(stderrstderr, _("Removing principal %s\n")gettext("Removing principal %s\n"), principal);
56 while (1) {
57 memset(&entry2, 0, sizeof(entry2));
58 krberr = krb5_kt_get_entry(context, ktid,
59 entry.principal,
60 0,
61 0,
62 &entry2);
63 if (krberr) {
64 if (removed > 0)
65 /* not found but we've removed some, we're done */
66 break;
67 if (krberr == ENOENT2) {
68 fprintf(stderrstderr, _("Failed to open keytab\n")gettext("Failed to open keytab\n"));
69 rval = 3;
70 goto done;
71 }
72 fprintf(stderrstderr, _("principal not found\n")gettext("principal not found\n"));
73 if (debug)
74 fprintf(stderrstderr, _("krb5_kt_get_entry %1$d: %2$s\n")gettext("krb5_kt_get_entry %1$d: %2$s\n"),
75 krberr, error_message(krberr));
76 rval = 5;
77 break;
78 }
79
80 krberr = krb5_kt_remove_entry(context, ktid, &entry2);
81 if (krberr) {
82 fprintf(stderrstderr, _("Unable to remove entry\n")gettext("Unable to remove entry\n"));
83 if (debug) {
84 fprintf(stdoutstdout, _("kvno %d\n")gettext("kvno %d\n"), entry2.vno);
85 fprintf(stderrstderr, _("krb5_kt_remove_entry %1$d: %2$s\n")gettext("krb5_kt_remove_entry %1$d: %2$s\n"),
86 krberr, error_message(krberr));
87 }
88 rval = 6;
89 break;
90 }
91
92 krb5_free_keytab_entry_contents(context, &entry2);
93 removed++;
94 }
95
96 if (entry2.principal)
97 krb5_free_keytab_entry_contents(context, &entry2);
98
99done:
100
101 return rval;
102}
103
104int
105remove_realm(krb5_context context, krb5_keytab ktid, const char *realm, int debug)
106{
107 krb5_error_code krberr;
108 krb5_keytab_entry entry;
109 krb5_kt_cursor kt_cursor;
110 char * entry_princ_s = NULL((void*)0);
111 int rval = 0;
112 bool_Bool realm_found = false0;
113
114 krberr = krb5_kt_start_seq_get(context, ktid, &kt_cursor);
115 memset(&entry, 0, sizeof(entry));
116 while (krb5_kt_next_entry(context, ktid, &entry, &kt_cursor) == 0) {
117 krberr = krb5_unparse_name(context, entry.principal, &entry_princ_s);
118 if (krberr) {
119 fprintf(stderrstderr, _("Unable to parse principal\n")gettext("Unable to parse principal\n"));
120 if (debug) {
121 fprintf(stderrstderr, _("krb5_unparse_name %1$d: %2$s\n")gettext("krb5_unparse_name %1$d: %2$s\n"),
122 krberr, error_message(krberr));
123 }
124 rval = 4;
125 goto done;
126 }
127
128 /* keytab entries are locked when looping. Temporarily suspend
129 * the looping. */
130 krb5_kt_end_seq_get(context, ktid, &kt_cursor);
131
132 if (strstr(entry_princ_s, realm) != NULL((void*)0)) {
133 realm_found = true1;
134 rval = remove_principal(context, ktid, entry_princ_s, debug);
135 if (rval != 0)
136 goto done;
137 /* Have to reset the cursor */
138 krberr = krb5_kt_start_seq_get(context, ktid, &kt_cursor);
Value stored to 'krberr' is never read
139 }
140 }
141
142 if (!realm_found) {
143 fprintf(stderrstderr, _("realm not found\n")gettext("realm not found\n"));
144 return 5;
145 }
146
147done:
148
149 return rval;
150}
151
152int
153main(int argc, const char **argv)
154{
155 krb5_context context;
156 krb5_error_code krberr;
157 krb5_keytab ktid;
158 krb5_kt_cursor cursor;
159 char * ktname = NULL((void*)0);
160 char * atrealm = NULL((void*)0);
161 poptContext pc;
162 static const char *keytab = NULL((void*)0);
163 static const char *principal = NULL((void*)0);
164 static const char *realm = NULL((void*)0);
165 int debug = 0;
166 int ret, rval = 0;
167 struct poptOption options[] = {
168 { "debug", 'd', POPT_ARG_NONE0U, &debug, 0,
169 _("Print debugging information")gettext("Print debugging information"), _("Debugging output")gettext("Debugging output") },
170 { "principal", 'p', POPT_ARG_STRING1U, &principal, 0,
171 _("The principal to remove from the keytab (ex: ftp/ftp.example.com@EXAMPLE.COM)")gettext("The principal to remove from the keytab (ex: ftp/ftp.example.com@EXAMPLE.COM)"
),
172 _("Kerberos Service Principal Name")gettext("Kerberos Service Principal Name") },
173 { "keytab", 'k', POPT_ARG_STRING1U, &keytab, 0,
174 _("The keytab file to remove the principcal(s) from")gettext("The keytab file to remove the principcal(s) from"), _("Keytab File Name")gettext("Keytab File Name") },
175 { "realm", 'r', POPT_ARG_STRING1U, &realm, 0,
176 _("Remove all principals in this realm")gettext("Remove all principals in this realm"), _("Realm name")gettext("Realm name") },
177 POPT_AUTOHELP{ ((void*)0), '\0', 4U, poptHelpOptions, 0, "Help options:", (
(void*)0) },
178 POPT_TABLEEND{ ((void*)0), '\0', 0, ((void*)0), 0, ((void*)0), ((void*)0) }
179 };
180
181 ret = init_gettext();
182 if (ret) {
183 fprintf(stderrstderr, "Failed to load translations\n");
184 }
185
186 memset(&ktid, 0, sizeof(ktid));
187
188 krberr = krb5_init_context(&context);
189 if (krberr) {
190 fprintf(stderrstderr, _("Kerberos context initialization failed\n")gettext("Kerberos context initialization failed\n"));
191 exit(1);
192 }
193
194 pc = poptGetContext("ipa-rmkeytab", argc, (const char **)argv, options, 0);
195 ret = poptGetNextOpt(pc);
196 if (ret != -1 || (!principal && !realm) || !keytab) {
197 poptPrintUsage(pc, stderrstderr, 0);
198 rval = 1;
199 goto cleanup;
200 }
201
202 ret = asprintf(&ktname, "WRFILE:%s", keytab);
203 if (ret == -1) {
204 rval = 2;
205 goto cleanup;
206 }
207
208 /* The remove_realm function just does a substring match. Ensure that
209 * the string we pass in looks like a realm.
210 */
211 if (realm) {
212 if (realm[0] != '@') {
213 ret = asprintf(&atrealm, "@%s", realm);
214 if (ret == -1) {
215 rval = 2;
216 goto cleanup;
217 }
218 } else {
219 atrealm = strdup(realm);
220
221 if (NULL((void*)0) == atrealm) {
222 rval = 2;
223 goto cleanup;
224 }
225 }
226 }
227
228 krberr = krb5_kt_resolve(context, ktname, &ktid);
229 if (krberr) {
230 fprintf(stderrstderr, _("Failed to open keytab '%1$s': %2$s\n")gettext("Failed to open keytab '%1$s': %2$s\n"), keytab,
231 error_message(krberr));
232 rval = 3;
233 goto cleanup;
234 }
235 krberr = krb5_kt_start_seq_get(context, ktid, &cursor);
236 if (krberr) {
237 fprintf(stderrstderr, _("Failed to open keytab '%1$s': %2$s\n")gettext("Failed to open keytab '%1$s': %2$s\n"), keytab,
238 error_message(krberr));
239 rval = 3;
240 goto cleanup;
241 }
242 krb5_kt_end_seq_get(context, ktid, &cursor);
243
244 if (principal)
245 rval = remove_principal(context, ktid, principal, debug);
246 else if (realm)
247 rval = remove_realm(context, ktid, atrealm, debug);
248
249cleanup:
250 if (rval == 0 || rval > 3) {
251 krberr = krb5_kt_close(context, ktid);
252 if (krberr) {
253 fprintf(stderrstderr, _("Closing keytab failed\n")gettext("Closing keytab failed\n"));
254 if (debug)
255 fprintf(stderrstderr, _("krb5_kt_close %1$d: %2$s\n")gettext("krb5_kt_close %1$d: %2$s\n"),
256 krberr, error_message(krberr));
257 }
258 }
259
260 krb5_free_context(context);
261
262 poptFreeContext(pc);
263
264 free(atrealm);
265 free(ktname);
266
267 return rval;
268}