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/types.h>
32
33#include <assert.h>
34#include <nsswitch.h>
35#include <pwd.h>
36#include <stdlib.h>
37#include <string.h>
38
39#include "../debug.h"
40#include "passwd.h"
41
42static int passwd_marshal_func(struct passwd *, char *, size_t *);
43static int passwd_lookup_func(const char *, size_t, char **, size_t *);
44static void *passwd_mp_init_func(void);
45static int passwd_mp_lookup_func(char **, size_t *, void *);
46static void passwd_mp_destroy_func(void *mdata);
47
48static int
49passwd_marshal_func(struct passwd *pwd, char *buffer, size_t *buffer_size)
50{
51	char		*p;
52	struct passwd	new_pwd;
53	size_t		desired_size, size;
54
55	TRACE_IN(passwd_marshal_func);
56	desired_size = sizeof(struct passwd) + sizeof(char *) +
57		strlen(pwd->pw_name) + 1;
58	if (pwd->pw_passwd != NULL)
59		desired_size += strlen(pwd->pw_passwd) + 1;
60	if (pwd->pw_class != NULL)
61		desired_size += strlen(pwd->pw_class) + 1;
62	if (pwd->pw_gecos != NULL)
63		desired_size += strlen(pwd->pw_gecos) + 1;
64	if (pwd->pw_dir != NULL)
65		desired_size += strlen(pwd->pw_dir) + 1;
66	if (pwd->pw_shell != NULL)
67		desired_size += strlen(pwd->pw_shell) + 1;
68
69	if ((*buffer_size < desired_size) || (buffer == NULL)) {
70		*buffer_size = desired_size;
71		TRACE_OUT(passwd_marshal_func);
72		return (NS_RETURN);
73	}
74
75	memcpy(&new_pwd, pwd, sizeof(struct passwd));
76	memset(buffer, 0, desired_size);
77
78	*buffer_size = desired_size;
79	p = buffer + sizeof(struct passwd) + sizeof(char *);
80	memcpy(buffer + sizeof(struct passwd), &p, sizeof(char *));
81
82	if (new_pwd.pw_name != NULL) {
83		size = strlen(new_pwd.pw_name);
84		memcpy(p, new_pwd.pw_name, size);
85		new_pwd.pw_name = p;
86		p += size + 1;
87	}
88
89	if (new_pwd.pw_passwd != NULL) {
90		size = strlen(new_pwd.pw_passwd);
91		memcpy(p, new_pwd.pw_passwd, size);
92		new_pwd.pw_passwd = p;
93		p += size + 1;
94	}
95
96	if (new_pwd.pw_class != NULL) {
97		size = strlen(new_pwd.pw_class);
98		memcpy(p, new_pwd.pw_class, size);
99		new_pwd.pw_class = p;
100		p += size + 1;
101	}
102
103	if (new_pwd.pw_gecos != NULL) {
104		size = strlen(new_pwd.pw_gecos);
105		memcpy(p, new_pwd.pw_gecos, size);
106		new_pwd.pw_gecos = p;
107		p += size + 1;
108	}
109
110	if (new_pwd.pw_dir != NULL) {
111		size = strlen(new_pwd.pw_dir);
112		memcpy(p, new_pwd.pw_dir, size);
113		new_pwd.pw_dir = p;
114		p += size + 1;
115	}
116
117	if (new_pwd.pw_shell != NULL) {
118		size = strlen(new_pwd.pw_shell);
119		memcpy(p, new_pwd.pw_shell, size);
120		new_pwd.pw_shell = p;
121		p += size + 1;
122	}
123
124	memcpy(buffer, &new_pwd, sizeof(struct passwd));
125	TRACE_OUT(passwd_marshal_func);
126	return (NS_SUCCESS);
127}
128
129static int
130passwd_lookup_func(const char *key, size_t key_size, char **buffer,
131	size_t *buffer_size)
132{
133	enum nss_lookup_type lookup_type;
134	char	*login;
135	size_t	size;
136	uid_t	uid;
137
138	struct passwd *result;
139
140	TRACE_IN(passwd_lookup_func);
141	assert(buffer != NULL);
142	assert(buffer_size != NULL);
143
144	if (key_size < sizeof(enum nss_lookup_type)) {
145		TRACE_OUT(passwd_lookup_func);
146		return (NS_UNAVAIL);
147	}
148	memcpy(&lookup_type, key, sizeof(enum nss_lookup_type));
149
150	switch (lookup_type) {
151	case nss_lt_name:
152		size = key_size - sizeof(enum nss_lookup_type)	+ 1;
153		login = calloc(1, size);
154		assert(login != NULL);
155		memcpy(login, key + sizeof(enum nss_lookup_type), size - 1);
156		break;
157	case nss_lt_id:
158		if (key_size < sizeof(enum nss_lookup_type) +
159			sizeof(uid_t)) {
160			TRACE_OUT(passwd_lookup_func);
161			return (NS_UNAVAIL);
162		}
163
164		memcpy(&uid, key + sizeof(enum nss_lookup_type), sizeof(uid_t));
165		break;
166	default:
167		TRACE_OUT(passwd_lookup_func);
168		return (NS_UNAVAIL);
169	}
170
171	switch (lookup_type) {
172	case nss_lt_name:
173		result = getpwnam(login);
174		free(login);
175		break;
176	case nss_lt_id:
177		result = getpwuid(uid);
178		break;
179	default:
180		/* SHOULD NOT BE REACHED */
181		break;
182	}
183
184	if (result != NULL) {
185		passwd_marshal_func(result, NULL, buffer_size);
186		*buffer = malloc(*buffer_size);
187		assert(*buffer != NULL);
188		passwd_marshal_func(result, *buffer, buffer_size);
189	}
190
191	TRACE_OUT(passwd_lookup_func);
192	return (result == NULL ? NS_NOTFOUND : NS_SUCCESS);
193}
194
195static void *
196passwd_mp_init_func(void)
197{
198	TRACE_IN(passwd_mp_init_func);
199	setpwent();
200	TRACE_OUT(passwd_mp_init_func);
201
202	return (NULL);
203}
204
205static int
206passwd_mp_lookup_func(char **buffer, size_t *buffer_size, void *mdata)
207{
208	struct passwd	*result;
209
210	TRACE_IN(passwd_mp_lookup_func);
211	result = getpwent();
212	if (result != NULL) {
213		passwd_marshal_func(result, NULL, buffer_size);
214		*buffer = malloc(*buffer_size);
215		assert(*buffer != NULL);
216		passwd_marshal_func(result, *buffer, buffer_size);
217	}
218
219	TRACE_OUT(passwd_mp_lookup_func);
220	return (result == NULL ? NS_NOTFOUND : NS_SUCCESS);
221}
222
223static void
224passwd_mp_destroy_func(void *mdata)
225{
226	TRACE_IN(passwd_mp_destroy_func);
227	TRACE_OUT(passwd_mp_destroy_func);
228}
229
230struct agent *
231init_passwd_agent(void)
232{
233	struct common_agent	*retval;
234
235	TRACE_IN(init_passwd_agent);
236	retval = calloc(1, sizeof(*retval));
237	assert(retval != NULL);
238
239	retval->parent.name = strdup("passwd");
240	assert(retval->parent.name != NULL);
241
242	retval->parent.type = COMMON_AGENT;
243	retval->lookup_func = passwd_lookup_func;
244
245	TRACE_OUT(init_passwd_agent);
246	return ((struct agent *)retval);
247}
248
249struct agent *
250init_passwd_mp_agent(void)
251{
252	struct multipart_agent	*retval;
253
254	TRACE_IN(init_passwd_mp_agent);
255	retval = calloc(1,
256		sizeof(*retval));
257	assert(retval != NULL);
258
259	retval->parent.name = strdup("passwd");
260	retval->parent.type = MULTIPART_AGENT;
261	retval->mp_init_func = passwd_mp_init_func;
262	retval->mp_lookup_func = passwd_mp_lookup_func;
263	retval->mp_destroy_func = passwd_mp_destroy_func;
264	assert(retval->parent.name != NULL);
265
266	TRACE_OUT(init_passwd_mp_agent);
267	return ((struct agent *)retval);
268}
269