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1 /*-
2  * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3  * All rights reserved.
4  *
5  * This software was developed for the FreeBSD Project by ThinkSec AS and
6  * Network Associates Laboratories, the Security Research Division of
7  * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
8  * ("CBOSS"), as part of the 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  * $P4: //depot/projects/openpam/include/security/openpam.h#28 $
35  */
36
37 #ifndef _SECURITY_OPENPAM_H_INCLUDED
38 #define _SECURITY_OPENPAM_H_INCLUDED
39
40 /*
41  * Annoying but necessary header pollution
42  */
43 #include <stdarg.h>
44
45 #ifdef __cplusplus
46 extern "C" {
47 #endif
48
49 struct passwd;
50
51 /*
52  * API extensions
53  */
54 int
55 openpam_borrow_cred(pam_handle_t *_pamh,
56         const struct passwd *_pwd);
57
58 void
59 openpam_free_data(pam_handle_t *_pamh,
60         void *_data,
61         int _status);
62
63 void
64 openpam_free_envlist(char **_envlist);
65
66 const char *
67 openpam_get_option(pam_handle_t *_pamh,
68         const char *_option);
69
70 int
71 openpam_restore_cred(pam_handle_t *_pamh);
72
73 int
74 openpam_set_option(pam_handle_t *_pamh,
75         const char *_option,
76         const char *_value);
77
78 int
79 pam_error(pam_handle_t *_pamh,
80         const char *_fmt,
81         ...);
82
83 int
84 pam_get_authtok(pam_handle_t *_pamh,
85         int _item,
86         const char **_authtok,
87         const char *_prompt);
88
89 int
90 pam_info(pam_handle_t *_pamh,
91         const char *_fmt,
92         ...);
93
94 int
95 pam_prompt(pam_handle_t *_pamh,
96         int _style,
97         char **_resp,
98         const char *_fmt,
99         ...);
100
101 int
102 pam_setenv(pam_handle_t *_pamh,
103         const char *_name,
104         const char *_value,
105         int _overwrite);
106
107 int
108 pam_vinfo(pam_handle_t *_pamh,
109         const char *_fmt,
110         va_list _ap);
111
112 int
113 pam_verror(pam_handle_t *_pamh,
114         const char *_fmt,
115         va_list _ap);
116
117 int
118 pam_vprompt(pam_handle_t *_pamh,
119         int _style,
120         char **_resp,
121         const char *_fmt,
122         va_list _ap);
123
124 /*
125  * Read cooked lines.
126  * Checking for _IOFBF is a fairly reliable way to detect the presence
127  * of <stdio.h>, as SUSv3 requires it to be defined there.
128  */
129 #ifdef _IOFBF
130 char *
131 openpam_readline(FILE *_f,
132         int *_lineno,
133         size_t *_lenp);
134 #endif
135
136 /*
137  * Log levels
138  */
139 enum {
140         PAM_LOG_DEBUG,
141         PAM_LOG_VERBOSE,
142         PAM_LOG_NOTICE,
143         PAM_LOG_ERROR
144 };
145
146 /*
147  * Log to syslog
148  */
149 void
150 _openpam_log(int _level,
151         const char *_func,
152         const char *_fmt,
153         ...)
154 #if defined(__GNUC__)
155         __attribute__((__format__(__printf__, 3, 4)))
156 #endif
157         ;
158
159 #if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
160 #define openpam_log(lvl, ...) \
161         _openpam_log((lvl), __func__, __VA_ARGS__)
162 #elif defined(__GNUC__) && (__GNUC__ >= 3)
163 #define openpam_log(lvl, ...) \
164         _openpam_log((lvl), __func__, __VA_ARGS__)
165 #elif defined(__GNUC__) && (__GNUC__ >= 2) && (__GNUC_MINOR__ >= 95)
166 #define openpam_log(lvl, fmt...) \
167         _openpam_log((lvl), __func__, ##fmt)
168 #elif defined(__GNUC__) && defined(__FUNCTION__)
169 #define openpam_log(lvl, fmt...) \
170         _openpam_log((lvl), __FUNCTION__, ##fmt)
171 #else
172 void
173 openpam_log(int _level,
174         const char *_format,
175         ...);
176 #endif
177
178 /*
179  * Generic conversation function
180  */
181 struct pam_message;
182 struct pam_response;
183 int openpam_ttyconv(int _n,
184         const struct pam_message **_msg,
185         struct pam_response **_resp,
186         void *_data);
187
188 extern int openpam_ttyconv_timeout;
189
190 /*
191  * Null conversation function
192  */
193 int openpam_nullconv(int _n,
194         const struct pam_message **_msg,
195         struct pam_response **_resp,
196         void *_data);
197
198 /*
199  * PAM primitives
200  */
201 enum {
202         PAM_SM_AUTHENTICATE,
203         PAM_SM_SETCRED,
204         PAM_SM_ACCT_MGMT,
205         PAM_SM_OPEN_SESSION,
206         PAM_SM_CLOSE_SESSION,
207         PAM_SM_CHAUTHTOK,
208         /* keep this last */
209         PAM_NUM_PRIMITIVES
210 };
211
212 /*
213  * Dummy service module function
214  */
215 #define PAM_SM_DUMMY(type)                                              \
216 PAM_EXTERN int                                                          \
217 pam_sm_##type(pam_handle_t *pamh, int flags,                            \
218     int argc, const char *argv[])                                       \
219 {                                                                       \
220         return (PAM_IGNORE);                                            \
221 }
222
223 /*
224  * PAM service module functions match this typedef
225  */
226 struct pam_handle;
227 typedef int (*pam_func_t)(struct pam_handle *, int, int, const char **);
228
229 /*
230  * A struct that describes a module.
231  */
232 typedef struct pam_module pam_module_t;
233 struct pam_module {
234         char            *path;
235         pam_func_t       func[PAM_NUM_PRIMITIVES];
236         void            *dlh;
237         int              refcount;
238         pam_module_t    *prev;
239         pam_module_t    *next;
240 };
241
242 /*
243  * Source-code compatibility with Linux-PAM modules
244  */
245 #if defined(PAM_SM_AUTH) || defined(PAM_SM_ACCOUNT) || \
246         defined(PAM_SM_SESSION) || defined(PAM_SM_PASSWORD)
247 #define LINUX_PAM_MODULE
248 #endif
249 #if defined(LINUX_PAM_MODULE) && !defined(PAM_SM_AUTH)
250 #define _PAM_SM_AUTHENTICATE    0
251 #define _PAM_SM_SETCRED         0
252 #else
253 #undef PAM_SM_AUTH
254 #define PAM_SM_AUTH
255 #define _PAM_SM_AUTHENTICATE    pam_sm_authenticate
256 #define _PAM_SM_SETCRED         pam_sm_setcred
257 #endif
258 #if defined(LINUX_PAM_MODULE) && !defined(PAM_SM_ACCOUNT)
259 #define _PAM_SM_ACCT_MGMT       0
260 #else
261 #undef PAM_SM_ACCOUNT
262 #define PAM_SM_ACCOUNT
263 #define _PAM_SM_ACCT_MGMT       pam_sm_acct_mgmt
264 #endif
265 #if defined(LINUX_PAM_MODULE) && !defined(PAM_SM_SESSION)
266 #define _PAM_SM_OPEN_SESSION    0
267 #define _PAM_SM_CLOSE_SESSION   0
268 #else
269 #undef PAM_SM_SESSION
270 #define PAM_SM_SESSION
271 #define _PAM_SM_OPEN_SESSION    pam_sm_open_session
272 #define _PAM_SM_CLOSE_SESSION   pam_sm_close_session
273 #endif
274 #if defined(LINUX_PAM_MODULE) && !defined(PAM_SM_PASSWORD)
275 #define _PAM_SM_CHAUTHTOK       0
276 #else
277 #undef PAM_SM_PASSWORD
278 #define PAM_SM_PASSWORD
279 #define _PAM_SM_CHAUTHTOK       pam_sm_chauthtok
280 #endif
281
282 /*
283  * Infrastructure for static modules using GCC linker sets.
284  * You are not expected to understand this.
285  */
286 #if defined(__FreeBSD__)
287 #define PAM_SOEXT ".so"
288 #else
289 #ifndef NO_STATIC_MODULES
290 #define NO_STATIC_MODULES
291 #endif
292 #endif
293 #if defined(__GNUC__) && !defined(__PIC__) && !defined(NO_STATIC_MODULES)
294 /* gcc, static linking */
295 #include <sys/cdefs.h>
296 #include <linker_set.h>
297 #define OPENPAM_STATIC_MODULES
298 #define PAM_EXTERN static
299 #define PAM_MODULE_ENTRY(name)                                          \
300 static char _pam_name[] = name PAM_SOEXT;                               \
301 static struct pam_module _pam_module = { _pam_name, {                   \
302     _PAM_SM_AUTHENTICATE, _PAM_SM_SETCRED, _PAM_SM_ACCT_MGMT,           \
303     _PAM_SM_OPEN_SESSION, _PAM_SM_CLOSE_SESSION, _PAM_SM_CHAUTHTOK },   \
304     NULL, 0, NULL, NULL };                                              \
305 DATA_SET(_openpam_static_modules, _pam_module)
306 #else
307 /* normal case */
308 #define PAM_EXTERN
309 #define PAM_MODULE_ENTRY(name)
310 #endif
311
312 #ifdef __cplusplus
313 }
314 #endif
315
316 #endif