source: openpam/trunk/lib/openpam_dispatch.c @ 62

Last change on this file since 62 was 56, checked in by Dag-Erling Smørgrav, 19 years ago

Add a missing 'continue' in the code for the PAM_SUCCESS case.
Add more debugging log messages.

Sponsored by: DARPA, NAI Labs

  • Property svn:keywords set to Id LastChangedRevision HeadURL LastChangedDate LastChangedBy
File size: 5.8 KB
Line 
1/*-
2 * Copyright (c) 2002 Networks Associates Technologies, Inc.
3 * All rights reserved.
4 *
5 * This software was developed for the FreeBSD Project by ThinkSec AS and
6 * NAI Labs, the Security Research Division of Network Associates, Inc.
7 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
8 * DARPA CHATS research program.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote
19 *    products derived from this software without specific prior written
20 *    permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * $Id: openpam_dispatch.c 56 2002-02-13 02:16:03Z des $
35 */
36
37#include <sys/param.h>
38
39#include <security/pam_appl.h>
40
41#include "openpam_impl.h"
42
43#if !defined(OPENPAM_RELAX_CHECKS)
44static void _openpam_check_error_code(int, int);
45#else
46#define _openpam_check_error_code(a, b)
47#endif /* !defined(OPENPAM_RELAX_CHECKS) */
48
49/*
50 * Execute a module chain
51 */
52
53int
54openpam_dispatch(pam_handle_t *pamh,
55        int primitive,
56        int flags)
57{
58        pam_chain_t *chain;
59        int err, fail, r;
60
61        if (pamh == NULL)
62                return (PAM_SYSTEM_ERR);
63
64        /* prevent recursion */
65        if (pamh->current != NULL) {
66                openpam_log(PAM_LOG_ERROR, "indirect recursion");
67                return (PAM_ABORT);
68        }
69
70        /* pick a chain */
71        switch (primitive) {
72        case PAM_SM_AUTHENTICATE:
73        case PAM_SM_SETCRED:
74                chain = pamh->chains[PAM_AUTH];
75                break;
76        case PAM_SM_ACCT_MGMT:
77                chain = pamh->chains[PAM_ACCOUNT];
78                break;
79        case PAM_SM_OPEN_SESSION:
80        case PAM_SM_CLOSE_SESSION:
81                chain = pamh->chains[PAM_SESSION];
82                break;
83        case PAM_SM_CHAUTHTOK:
84                chain = pamh->chains[PAM_PASSWORD];
85                break;
86        default:
87                return (PAM_SYSTEM_ERR);
88        }
89
90        /* execute */
91        for (err = fail = 0; chain != NULL; chain = chain->next) {
92                openpam_log(PAM_LOG_DEBUG, "calling %s() in %s",
93                    _pam_sm_func_name[primitive], chain->module->path);
94                if (chain->module->func[primitive] == NULL) {
95                        openpam_log(PAM_LOG_ERROR, "%s: no %s()",
96                            chain->module->path, _pam_sm_func_name[primitive]);
97                        continue;
98                } else {
99                        pamh->current = chain;
100                        r = (chain->module->func[primitive])(pamh, flags,
101                            chain->optc, (const char **)chain->optv);
102                        pamh->current = NULL;
103                        openpam_log(PAM_LOG_DEBUG, "%s: %s(): %s",
104                            chain->module->path, _pam_sm_func_name[primitive],
105                            pam_strerror(pamh, r));
106                }
107
108                if (r == PAM_IGNORE)
109                        continue;
110                if (r == PAM_SUCCESS) {
111                        /*
112                         * For pam_setcred(), treat "sufficient" as
113                         * "optional".
114                         *
115                         * Note that Solaris libpam does not terminate
116                         * the chain here if a required module has
117                         * previously failed.  I'm not sure why.
118                         */
119                        if (chain->flag == PAM_SUFFICIENT &&
120                            primitive != PAM_SM_SETCRED)
121                                break;
122                        continue;
123                }
124
125                _openpam_check_error_code(primitive, r);
126
127                /*
128                 * Record the return code from the first module to
129                 * fail.  If a required module fails, record the
130                 * return code from the first required module to fail.
131                 */
132                if (err == 0)
133                        err = r;
134                if (chain->flag == PAM_REQUIRED && !fail) {
135                        openpam_log(PAM_LOG_DEBUG, "required module failed");
136                        fail = 1;
137                        err = r;
138                }
139
140                /*
141                 * If a requisite module fails, terminate the chain
142                 * immediately.
143                 */
144                if (chain->flag == PAM_REQUISITE) {
145                        openpam_log(PAM_LOG_DEBUG, "requisite module failed");
146                        fail = 1;
147                        break;
148                }
149        }
150
151        if (!fail)
152                err = PAM_SUCCESS;
153        openpam_log(PAM_LOG_DEBUG, "returning: %s", pam_strerror(pamh, err));
154        return (err);
155}
156
157#if !defined(OPENPAM_RELAX_CHECKS)
158static void
159_openpam_check_error_code(int primitive, int r)
160{
161        /* common error codes */
162        if (r == PAM_SUCCESS ||
163            r == PAM_SERVICE_ERR ||
164            r == PAM_BUF_ERR ||
165            r == PAM_CONV_ERR ||
166            r == PAM_PERM_DENIED ||
167            r == PAM_ABORT)
168                return;
169
170        /* specific error codes */
171        switch (primitive) {
172        case PAM_SM_AUTHENTICATE:
173                if (r == PAM_AUTH_ERR ||
174                    r == PAM_CRED_INSUFFICIENT ||
175                    r == PAM_AUTHINFO_UNAVAIL ||
176                    r == PAM_USER_UNKNOWN ||
177                    r == PAM_MAXTRIES)
178                        return;
179                break;
180        case PAM_SM_SETCRED:
181                if (r == PAM_CRED_UNAVAIL ||
182                    r == PAM_CRED_EXPIRED ||
183                    r == PAM_USER_UNKNOWN ||
184                    r == PAM_CRED_ERR)
185                        return;
186                break;
187        case PAM_SM_ACCT_MGMT:
188                if (r == PAM_USER_UNKNOWN ||
189                    r == PAM_AUTH_ERR ||
190                    r == PAM_NEW_AUTHTOK_REQD ||
191                    r == PAM_ACCT_EXPIRED)
192                        return;
193                break;
194        case PAM_SM_OPEN_SESSION:
195        case PAM_SM_CLOSE_SESSION:
196                if (r == PAM_SESSION_ERR)
197                        return;
198                break;
199        case PAM_SM_CHAUTHTOK:
200                if (r == PAM_PERM_DENIED ||
201                    r == PAM_AUTHTOK_ERR ||
202                    r == PAM_AUTHTOK_RECOVERY_ERR ||
203                    r == PAM_AUTHTOK_LOCK_BUSY ||
204                    r == PAM_AUTHTOK_DISABLE_AGING)
205                        return;
206                break;
207        }
208
209        openpam_log(PAM_LOG_ERROR, "%s(): unexpected return value %d",
210            _pam_sm_func_name[primitive], r);
211}
212#endif /* !defined(OPENPAM_RELAX_CHECKS) */
Note: See TracBrowser for help on using the repository browser.