1/*-
2 * Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD$");
30
31#include <sys/param.h>
32
33#include <assert.h>
34#include <grp.h>
35#include <nsswitch.h>
36#include <stdlib.h>
37#include <string.h>
38
39#include "../debug.h"
40#include "group.h"
41
42static int group_marshal_func(struct group *, char *, size_t *);
43static int group_lookup_func(const char *, size_t, char **, size_t *);
44static void *group_mp_init_func(void);
45static int group_mp_lookup_func(char **, size_t *, void *);
46static void group_mp_destroy_func(void *);
47
48static int
49group_marshal_func(struct group *grp, char *buffer, size_t *buffer_size)
50{
51	struct group new_grp;
52	size_t desired_size, size, mem_size;
53	char *p, **mem;
54
55	TRACE_IN(group_marshal_func);
56	desired_size = ALIGNBYTES + sizeof(struct group) + sizeof(char *);
57
58	if (grp->gr_name != NULL)
59		desired_size += strlen(grp->gr_name) + 1;
60	if (grp->gr_passwd != NULL)
61		desired_size += strlen(grp->gr_passwd) + 1;
62
63	if (grp->gr_mem != NULL) {
64		mem_size = 0;
65		for (mem = grp->gr_mem; *mem; ++mem) {
66			desired_size += strlen(*mem) + 1;
67			++mem_size;
68		}
69
70		desired_size += ALIGNBYTES + (mem_size + 1) * sizeof(char *);
71	}
72
73	if ((desired_size > *buffer_size) || (buffer == NULL)) {
74		*buffer_size = desired_size;
75		TRACE_OUT(group_marshal_func);
76		return (NS_RETURN);
77	}
78
79	memcpy(&new_grp, grp, sizeof(struct group));
80	memset(buffer, 0, desired_size);
81
82	*buffer_size = desired_size;
83	p = buffer + sizeof(struct group) + sizeof(char *);
84	memcpy(buffer + sizeof(struct group), &p, sizeof(char *));
85	p = (char *)ALIGN(p);
86
87	if (new_grp.gr_name != NULL) {
88		size = strlen(new_grp.gr_name);
89		memcpy(p, new_grp.gr_name, size);
90		new_grp.gr_name = p;
91		p += size + 1;
92	}
93
94	if (new_grp.gr_passwd != NULL) {
95		size = strlen(new_grp.gr_passwd);
96		memcpy(p, new_grp.gr_passwd, size);
97		new_grp.gr_passwd = p;
98		p += size + 1;
99	}
100
101	if (new_grp.gr_mem != NULL) {
102		p = (char *)ALIGN(p);
103		memcpy(p, new_grp.gr_mem, sizeof(char *) * mem_size);
104		new_grp.gr_mem = (char **)p;
105		p += sizeof(char *) * (mem_size + 1);
106
107		for (mem = new_grp.gr_mem; *mem; ++mem) {
108			size = strlen(*mem);
109			memcpy(p, *mem, size);
110			*mem = p;
111			p += size + 1;
112		}
113	}
114
115	memcpy(buffer, &new_grp, sizeof(struct group));
116	TRACE_OUT(group_marshal_func);
117	return (NS_SUCCESS);
118}
119
120static int
121group_lookup_func(const char *key, size_t key_size, char **buffer,
122	size_t *buffer_size)
123{
124	enum nss_lookup_type lookup_type;
125	char	*name;
126	size_t	size;
127	gid_t	gid;
128
129	struct group *result;
130
131	TRACE_IN(group_lookup_func);
132	assert(buffer != NULL);
133	assert(buffer_size != NULL);
134
135	if (key_size < sizeof(enum nss_lookup_type)) {
136		TRACE_OUT(group_lookup_func);
137		return (NS_UNAVAIL);
138	}
139	memcpy(&lookup_type, key, sizeof(enum nss_lookup_type));
140
141	switch (lookup_type) {
142	case nss_lt_name:
143		size = key_size - sizeof(enum nss_lookup_type)	+ 1;
144		name = calloc(1, size);
145		assert(name != NULL);
146		memcpy(name, key + sizeof(enum nss_lookup_type), size - 1);
147		break;
148	case nss_lt_id:
149		if (key_size < sizeof(enum nss_lookup_type) +
150			sizeof(gid_t)) {
151			TRACE_OUT(passwd_lookup_func);
152			return (NS_UNAVAIL);
153		}
154
155		memcpy(&gid, key + sizeof(enum nss_lookup_type), sizeof(gid_t));
156		break;
157	default:
158		TRACE_OUT(group_lookup_func);
159		return (NS_UNAVAIL);
160	}
161
162	switch (lookup_type) {
163	case nss_lt_name:
164		TRACE_STR(name);
165		result = getgrnam(name);
166		free(name);
167		break;
168	case nss_lt_id:
169		result = getgrgid(gid);
170		break;
171	default:
172		/* SHOULD NOT BE REACHED */
173		break;
174	}
175
176	if (result != NULL) {
177		group_marshal_func(result, NULL, buffer_size);
178		*buffer = malloc(*buffer_size);
179		assert(*buffer != NULL);
180		group_marshal_func(result, *buffer, buffer_size);
181	}
182
183	TRACE_OUT(group_lookup_func);
184	return (result == NULL ? NS_NOTFOUND : NS_SUCCESS);
185}
186
187static void *
188group_mp_init_func(void)
189{
190	TRACE_IN(group_mp_init_func);
191	setgrent();
192	TRACE_OUT(group_mp_init_func);
193
194	return (NULL);
195}
196
197static int
198group_mp_lookup_func(char **buffer, size_t *buffer_size, void *mdata)
199{
200	struct group *result;
201
202	TRACE_IN(group_mp_lookup_func);
203	result = getgrent();
204	if (result != NULL) {
205		group_marshal_func(result, NULL, buffer_size);
206		*buffer = malloc(*buffer_size);
207		assert(*buffer != NULL);
208		group_marshal_func(result, *buffer, buffer_size);
209	}
210
211	TRACE_OUT(group_mp_lookup_func);
212	return (result == NULL ? NS_NOTFOUND : NS_SUCCESS);
213}
214
215static void
216group_mp_destroy_func(void *mdata)
217{
218	TRACE_IN(group_mp_destroy_func);
219	TRACE_OUT(group_mp_destroy_func);
220}
221
222struct agent *
223init_group_agent(void)
224{
225	struct common_agent	*retval;
226
227	TRACE_IN(init_group_agent);
228	retval = calloc(1, sizeof(*retval));
229	assert(retval != NULL);
230
231	retval->parent.name = strdup("group");
232	assert(retval->parent.name != NULL);
233
234	retval->parent.type = COMMON_AGENT;
235	retval->lookup_func = group_lookup_func;
236
237	TRACE_OUT(init_group_agent);
238	return ((struct agent *)retval);
239}
240
241struct agent *
242init_group_mp_agent(void)
243{
244	struct multipart_agent	*retval;
245
246	TRACE_IN(init_group_mp_agent);
247	retval = calloc(1,
248		sizeof(*retval));
249	assert(retval != NULL);
250
251	retval->parent.name = strdup("group");
252	retval->parent.type = MULTIPART_AGENT;
253	retval->mp_init_func = group_mp_init_func;
254	retval->mp_lookup_func = group_mp_lookup_func;
255	retval->mp_destroy_func = group_mp_destroy_func;
256	assert(retval->parent.name != NULL);
257
258	TRACE_OUT(init_group_mp_agent);
259	return ((struct agent *)retval);
260}
261