source: openpam/trunk/lib/openpam_dispatch.c @ 32

Last change on this file since 32 was 32, checked in by Dag-Erling Smørgrav, 16 years ago

Add support for static linking. Also rename a handful of constants
to reduce the chance of every running into a naming conflict.

Sponsored by: DARPA, NAI Labs

  • Property svn:keywords set to Id LastChangedRevision HeadURL LastChangedDate LastChangedBy
File size: 5.5 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 32 2002-02-04 23:22:40Z 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        /* fail if the chain is empty */
91        if (chain == NULL)
92                return (PAM_SYSTEM_ERR);
93
94        /* execute */
95        for (err = fail = 0; chain != NULL; chain = chain->next) {
96                if (chain->module->func[primitive] == NULL) {
97                        openpam_log(PAM_LOG_ERROR, "%s: no %s()",
98                            chain->module->path, _pam_sm_func_name[primitive]);
99                        r = PAM_SYMBOL_ERR;
100                } else {
101                        pamh->current = chain;
102                        r = (chain->module->func[primitive])(pamh, flags,
103                            chain->optc, (const char **)chain->optv);
104                        pamh->current = NULL;
105                        openpam_log(PAM_LOG_DEBUG, "%s: %s(): %s",
106                            chain->module->path, _pam_sm_func_name[primitive],
107                            pam_strerror(pamh, r));
108                }
109
110                if (r == PAM_IGNORE)
111                        continue;
112                if (r == PAM_SUCCESS) {
113                        /*
114                         * For pam_setcred(), treat "sufficient" as
115                         * "optional".
116                         *
117                         * Note that Solaris libpam does not terminate
118                         * the chain here if a required module has
119                         * previously failed.  I'm not sure why.
120                         */
121                        if (chain->flag == PAM_SUFFICIENT &&
122                            primitive != PAM_SM_SETCRED)
123                                break;
124                }
125
126                _openpam_check_error_code(primitive, r);
127
128                /*
129                 * Record the return code from the first module to
130                 * fail.  If a required module fails, record the
131                 * return code from the first required module to fail.
132                 */
133                if (err == 0)
134                        err = r;
135                if (chain->flag == PAM_REQUIRED && !fail) {
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                        fail = 1;
146                        break;
147                }
148        }
149
150        return (fail ? err : PAM_SUCCESS);
151}
152
153#if !defined(OPENPAM_RELAX_CHECKS)
154static void
155_openpam_check_error_code(int primitive, int r)
156{
157        /* common error codes */
158        if (r == PAM_SERVICE_ERR ||
159            r == PAM_BUF_ERR ||
160            r == PAM_BUF_ERR ||
161            r == PAM_CONV_ERR ||
162            r == PAM_PERM_DENIED)
163                return;
164
165        /* specific error codes */
166        switch (primitive) {
167        case PAM_SM_AUTHENTICATE:
168                if (r == PAM_AUTH_ERR ||
169                    r == PAM_CRED_INSUFFICIENT ||
170                    r == PAM_AUTHINFO_UNAVAIL ||
171                    r == PAM_USER_UNKNOWN ||
172                    r == PAM_MAXTRIES)
173                        return;
174                break;
175        case PAM_SM_SETCRED:
176                if (r == PAM_CRED_UNAVAIL ||
177                    r == PAM_CRED_EXPIRED ||
178                    r == PAM_USER_UNKNOWN ||
179                    r == PAM_CRED_ERR)
180                        return;
181                break;
182        case PAM_SM_ACCT_MGMT:
183                if (r == PAM_USER_UNKNOWN ||
184                    r == PAM_AUTH_ERR ||
185                    r == PAM_NEW_AUTHTOK_REQD ||
186                    r == PAM_ACCT_EXPIRED)
187                        return;
188                break;
189        case PAM_SM_OPEN_SESSION:
190        case PAM_SM_CLOSE_SESSION:
191                if (r == PAM_SESSION_ERR)
192                        return;
193                break;
194        case PAM_SM_CHAUTHTOK:
195                if (r == PAM_PERM_DENIED ||
196                    r == PAM_AUTHTOK_ERR ||
197                    r == PAM_AUTHTOK_RECOVERY_ERR ||
198                    r == PAM_AUTHTOK_LOCK_BUSY ||
199                    r == PAM_AUTHTOK_DISABLE_AGING)
200                        return;
201                break;
202        }
203
204        openpam_log(PAM_LOG_ERROR, "%s(): unexpected return value %d",
205            _pam_sm_func_name[primitive], r);
206}
207#endif /* !defined(OPENPAM_RELAX_CHECKS) */
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