1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 
23 /*
24  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
25  * Use is subject to license terms.
26  */
27 
28 #pragma ident	"%Z%%M%	%I%	%E% SMI"
29 
30 #include "mt.h"
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <sys/types.h>
34 #include <nss_dbdefs.h>
35 #include <string.h>
36 #include <strings.h>
37 #include <sys/systeminfo.h>
38 #include <thread.h>
39 #include <synch.h>
40 #include <nsswitch.h>
41 #include <prof_attr.h>
42 #include <exec_attr.h>
43 
44 /* externs from libc */
45 extern void _nss_db_state_destr(struct nss_db_state *);
46 
47 /* externs from parse.c */
48 extern char *_strtok_escape(char *, char *, char **);
49 extern char *_strdup_null(char *);
50 /* extern from getprofattr.c */
51 extern int str2profattr(const char *, int, void *, char *, int);
52 
53 char *_exec_wild_id(char *, const char *);
54 execstr_t *_dup_execstr(execstr_t *);
55 void _free_execstr(execstr_t *);
56 
57 static char *_nsw_search_path = NULL;
58 
59 /*
60  * Unsynchronized, but it affects only efficiency, not correctness
61  */
62 
63 static DEFINE_NSS_DB_ROOT(exec_root);
64 static DEFINE_NSS_GETENT(context);
65 
66 void
67 _nss_initf_execattr(nss_db_params_t *p)
68 {
69 	p->name = NSS_DBNAM_EXECATTR;
70 	p->config_name    = NSS_DBNAM_PROFATTR; /* use config for "prof_attr" */
71 }
72 
73 void
74 _nsw_initf_execattr(nss_db_params_t *p)
75 {
76 	p->name = NSS_DBNAM_EXECATTR;
77 	p->flags |= NSS_USE_DEFAULT_CONFIG;
78 	p->default_config = _nsw_search_path;
79 }
80 
81 void
82 _nsw_initf_profattr(nss_db_params_t *p)
83 {
84 	p->name = NSS_DBNAM_PROFATTR;
85 	p->flags |= NSS_USE_DEFAULT_CONFIG;
86 	p->default_config = _nsw_search_path;
87 }
88 
89 /*
90  * Return values: 0 = success, 1 = parse error, 2 = erange ... The structure
91  * pointer passed in is a structure in the caller's space wherein the field
92  * pointers would be set to areas in the buffer if need be. instring and buffer
93  * should be separate areas.
94  */
95 int
96 str2execattr(const char *instr, int lenstr, void *ent, char *buffer, int buflen)
97 {
98 	char		*last = NULL;
99 	char		*sep = KV_TOKEN_DELIMIT;
100 	execstr_t	*exec = (execstr_t *)ent;
101 
102 	if (exec == NULL)
103 		return (NSS_STR_PARSE_PARSE);
104 
105 	if ((instr >= buffer && (buffer + buflen) > instr) ||
106 	    (buffer >= instr && (instr + lenstr) > buffer))
107 		return (NSS_STR_PARSE_PARSE);
108 	if (lenstr >= buflen)
109 		return (NSS_STR_PARSE_ERANGE);
110 	(void) strncpy(buffer, instr, buflen);
111 	/*
112 	 * Remove newline that nis (yp_match) puts at the
113 	 * end of the entry it retrieves from the map.
114 	 */
115 	if (buffer[lenstr] == '\n') {
116 		buffer[lenstr] = '\0';
117 	}
118 
119 	exec->name = _strtok_escape(buffer, sep, &last);
120 	exec->policy = _strtok_escape(NULL, sep, &last);
121 	exec->type = _strtok_escape(NULL, sep, &last);
122 	exec->res1 = _strtok_escape(NULL, sep, &last);
123 	exec->res2 = _strtok_escape(NULL, sep, &last);
124 	exec->id = _strtok_escape(NULL, sep, &last);
125 	exec->attr = _strtok_escape(NULL, sep, &last);
126 	exec->next = NULL;
127 
128 	return (NSS_STR_PARSE_SUCCESS);
129 }
130 
131 
132 void
133 _setexecattr(void)
134 {
135 	nss_setent(&exec_root, _nss_initf_execattr, &context);
136 }
137 
138 
139 void
140 _endexecattr(void)
141 {
142 	nss_endent(&exec_root, _nss_initf_execattr, &context);
143 	nss_delete(&exec_root);
144 }
145 
146 
147 execstr_t *
148 _getexecattr(execstr_t *result, char *buffer, int buflen, int *errnop)
149 {
150 	nss_status_t    res;
151 	nss_XbyY_args_t arg;
152 
153 	NSS_XbyY_INIT(&arg, result, buffer, buflen, str2execattr);
154 	res = nss_getent(&exec_root, _nss_initf_execattr, &context, &arg);
155 	arg.status = res;
156 	*errnop = arg.h_errno;
157 
158 	return ((execstr_t *)NSS_XbyY_FINI(&arg));
159 }
160 
161 execstr_t *
162 _getexecprof(char *name,
163     char *type,
164     char *id,
165     int search_flag,
166     execstr_t *result,
167     char *buffer,
168     int buflen,
169     int *errnop)
170 {
171 	int		getby_flag;
172 	char		policy_buf[BUFSIZ];
173 	const char	*empty = NULL;
174 	nss_status_t	res = NSS_NOTFOUND;
175 	nss_XbyY_args_t	arg;
176 	_priv_execattr	_priv_exec;
177 	static mutex_t	_nsw_exec_lock = DEFAULTMUTEX;
178 
179 	NSS_XbyY_INIT(&arg, result, buffer, buflen, str2execattr);
180 
181 	_priv_exec.name = (name == NULL) ? empty : (const char *)name;
182 	_priv_exec.type = (type == NULL) ? empty : (const char *)type;
183 	_priv_exec.id = (id == NULL) ? empty : (const char *)id;
184 #ifdef SI_SECPOLICY
185 	if (sysinfo(SI_SECPOLICY, policy_buf, BUFSIZ) == -1)
186 #endif	/* SI_SECPOLICY */
187 	(void) strncpy(policy_buf, DEFAULT_POLICY, BUFSIZ);
188 
189 retry_policy:
190 	_priv_exec.policy = policy_buf;
191 	_priv_exec.search_flag = search_flag;
192 	_priv_exec.head_exec = NULL;
193 	_priv_exec.prev_exec = NULL;
194 
195 	if ((name != NULL) && (id != NULL)) {
196 		getby_flag = NSS_DBOP_EXECATTR_BYNAMEID;
197 	} else if (name != NULL) {
198 		getby_flag = NSS_DBOP_EXECATTR_BYNAME;
199 	} else if (id != NULL) {
200 		getby_flag = NSS_DBOP_EXECATTR_BYID;
201 	}
202 
203 	arg.key.attrp = &(_priv_exec);
204 
205 	switch (getby_flag) {
206 	case NSS_DBOP_EXECATTR_BYID:
207 		res = nss_search(&exec_root, _nss_initf_execattr, getby_flag,
208 		    &arg);
209 		break;
210 	case NSS_DBOP_EXECATTR_BYNAMEID:
211 	case NSS_DBOP_EXECATTR_BYNAME:
212 		{
213 			char			pbuf[NSS_BUFLEN_PROFATTR];
214 			profstr_t		prof;
215 			nss_status_t		pres;
216 			nss_XbyY_args_t		parg;
217 			enum __nsw_parse_err	pserr;
218 			struct __nsw_lookup	*lookups = NULL;
219 			struct __nsw_switchconfig *conf = NULL;
220 
221 			if (conf = __nsw_getconfig(NSS_DBNAM_PROFATTR, &pserr))
222 				if ((lookups = conf->lookups) == NULL)
223 					goto out;
224 			NSS_XbyY_INIT(&parg, &prof, pbuf, NSS_BUFLEN_PROFATTR,
225 			    str2profattr);
226 			parg.key.name = name;
227 			do {
228 				/*
229 				 * search the exec_attr entry only in the scope
230 				 * that we find the profile in.
231 				 * if conf = NULL, search in local files only,
232 				 * as we were not able to read nsswitch.conf.
233 				 */
234 				DEFINE_NSS_DB_ROOT(prof_root);
235 				if (mutex_lock(&_nsw_exec_lock) != 0)
236 					goto out;
237 				_nsw_search_path = (conf == NULL)
238 				    ? NSS_FILES_ONLY
239 				    : lookups->service_name;
240 				pres = nss_search(&prof_root,
241 				    _nsw_initf_profattr,
242 				    NSS_DBOP_PROFATTR_BYNAME, &parg);
243 				if (pres == NSS_SUCCESS) {
244 					DEFINE_NSS_DB_ROOT(pexec_root);
245 					res = nss_search(&pexec_root,
246 					    _nsw_initf_execattr, getby_flag,
247 					    &arg);
248 					_nss_db_state_destr(pexec_root.s);
249 				}
250 				_nss_db_state_destr(prof_root.s);
251 				(void) mutex_unlock(&_nsw_exec_lock);
252 				if ((pres == NSS_SUCCESS) || (conf == NULL))
253 					break;
254 			} while (lookups && (lookups = lookups->next));
255 		}
256 		break;
257 	default:
258 		break;
259 	}
260 
261 out:
262 	/*
263 	 * If we can't find an entry for the current default policy
264 	 * fall back to the old "suser" policy.  The nameservice is
265 	 * shared between different OS releases.
266 	 */
267 	if (res == NSS_NOTFOUND && strcmp(policy_buf, DEFAULT_POLICY) == 0) {
268 		(void) strlcpy(policy_buf, SUSER_POLICY, BUFSIZ);
269 		goto retry_policy;
270 	}
271 
272 	arg.status = res;
273 	*errnop = res;
274 	return ((execstr_t *)NSS_XbyY_FINI(&arg));
275 }
276 
277 
278 int
279 _doexeclist(nss_XbyY_args_t *argp)
280 {
281 	int		status = 1;
282 	_priv_execattr	*_priv_exec = (_priv_execattr *)(argp->key.attrp);
283 	execstr_t	*exec = (execstr_t *)((argp->buf.result));
284 
285 	if (_priv_exec->head_exec == NULL) {
286 		if (_priv_exec->head_exec = _dup_execstr(exec))
287 			_priv_exec->prev_exec = _priv_exec->head_exec;
288 		else
289 			status = 0;
290 	} else {
291 		if (_priv_exec->prev_exec->next = _dup_execstr(exec))
292 			_priv_exec->prev_exec = _priv_exec->prev_exec->next;
293 		else
294 			status = 0;
295 	}
296 	(void) memset(argp->buf.buffer, NULL, argp->buf.buflen);
297 
298 	return (status);
299 
300 }
301 
302 
303 /*
304  * Converts id to a wildcard string. e.g.:
305  *   For type = KV_COMMAND: /usr/ccs/bin/what ---> /usr/ccs/bin/\* ---> \*
306  *   For type = KV_ACTION: Dtfile;*;*;*;0 ---> *;*;*;*;*
307  *
308  * Returns NULL if id is already a wild-card.
309  */
310 char *
311 _exec_wild_id(char *id, const char *type)
312 {
313 	char	c_id = '/';
314 	char	*pchar = NULL;
315 
316 	if ((id == NULL) || (type == NULL))
317 		return (NULL);
318 
319 	if (strcmp(type, KV_ACTION) == 0) {
320 		return ((strcmp(id, KV_ACTION_WILDCARD) == 0) ? NULL :
321 		    KV_ACTION_WILDCARD);
322 	} else if (strcmp(type, KV_COMMAND) == 0) {
323 		if ((pchar = rindex(id, c_id)) == NULL)
324 			/*
325 			 * id = \*
326 			 */
327 			return (NULL);
328 		else if (*(++pchar) == KV_WILDCHAR)
329 			/*
330 			 * id = /usr/ccs/bin/\*
331 			 */
332 			return (pchar);
333 		/*
334 		 * id = /usr/ccs/bin/what
335 		 */
336 		(void) strcpy(pchar, KV_WILDCARD);
337 		return (id);
338 	}
339 
340 	return (NULL);
341 
342 }
343 
344 
345 execstr_t *
346 _dup_execstr(execstr_t *old_exec)
347 {
348 	execstr_t *new_exec = NULL;
349 
350 	if (old_exec == NULL)
351 		return (NULL);
352 	if ((new_exec = malloc(sizeof (execstr_t))) != NULL) {
353 		new_exec->name = _strdup_null(old_exec->name);
354 		new_exec->type = _strdup_null(old_exec->type);
355 		new_exec->policy = _strdup_null(old_exec->policy);
356 		new_exec->res1 = _strdup_null(old_exec->res1);
357 		new_exec->res2 = _strdup_null(old_exec->res2);
358 		new_exec->id = _strdup_null(old_exec->id);
359 		new_exec->attr = _strdup_null(old_exec->attr);
360 		new_exec->next = old_exec->next;
361 	}
362 	return (new_exec);
363 }
364 
365 void
366 _free_execstr(execstr_t *exec)
367 {
368 	if (exec != NULL) {
369 		free(exec->name);
370 		free(exec->type);
371 		free(exec->policy);
372 		free(exec->res1);
373 		free(exec->res2);
374 		free(exec->id);
375 		free(exec->attr);
376 		_free_execstr(exec->next);
377 		free(exec);
378 	}
379 }
380 
381 void
382 _exec_cleanup(nss_status_t res, nss_XbyY_args_t *argp)
383 {
384 	_priv_execattr	*_priv_exec = (_priv_execattr *)(argp->key.attrp);
385 
386 	if (res == NSS_SUCCESS) {
387 		if (_priv_exec->head_exec != NULL) {
388 			argp->buf.result = _priv_exec->head_exec;
389 			argp->returnval = argp->buf.result;
390 		}
391 	} else {
392 		if (_priv_exec->head_exec != NULL)
393 			_free_execstr(_priv_exec->head_exec);
394 		argp->returnval = NULL;
395 	}
396 }
397