passwd.c revision 184186 
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: head/usr.sbin/nscd/agents/passwd.c 184186 2008-10-23 00:15:00Z delphij $");
30
31#include <sys/types.h>
32#include <assert.h>
33#include <nsswitch.h>
34#include <pwd.h>
35#include <string.h>
36#include <stdlib.h>
37#include "../debug.h"
38#include "passwd.h"
39
40static int passwd_marshal_func(struct passwd *, char *, size_t *);
41static int passwd_lookup_func(const char *, size_t, char **, size_t *);
42static void *passwd_mp_init_func();
43static int passwd_mp_lookup_func(char **, size_t *, void *);
44static void passwd_mp_destroy_func(void *mdata);
45
46static int
47passwd_marshal_func(struct passwd *pwd, char *buffer, size_t *buffer_size)
48{
49	char		*p;
50	struct passwd	new_pwd;
51	size_t		desired_size, size;
52
53	TRACE_IN(passwd_marshal_func);
54	desired_size = sizeof(struct passwd) + sizeof(char *) +
55		strlen(pwd->pw_name) + 1;
56	if (pwd->pw_passwd != NULL)
57		desired_size += strlen(pwd->pw_passwd) + 1;
58	if (pwd->pw_class != NULL)
59		desired_size += strlen(pwd->pw_class) + 1;
60	if (pwd->pw_gecos != NULL)
61		desired_size += strlen(pwd->pw_gecos) + 1;
62	if (pwd->pw_dir != NULL)
63		desired_size += strlen(pwd->pw_dir) + 1;
64	if (pwd->pw_shell != NULL)
65		desired_size += strlen(pwd->pw_shell) + 1;
66
67	if ((*buffer_size < desired_size) || (buffer == NULL)) {
68		*buffer_size = desired_size;
69		TRACE_OUT(passwd_marshal_func);
70		return (NS_RETURN);
71	}
72
73	memcpy(&new_pwd, pwd, sizeof(struct passwd));
74	memset(buffer, 0, desired_size);
75
76	*buffer_size = desired_size;
77	p = buffer + sizeof(struct passwd) + sizeof(char *);
78	memcpy(buffer + sizeof(struct passwd), &p, sizeof(char *));
79
80	if (new_pwd.pw_name != NULL) {
81		size = strlen(new_pwd.pw_name);
82		memcpy(p, new_pwd.pw_name, size);
83		new_pwd.pw_name = p;
84		p += size + 1;
85	}
86
87	if (new_pwd.pw_passwd != NULL) {
88		size = strlen(new_pwd.pw_passwd);
89		memcpy(p, new_pwd.pw_passwd, size);
90		new_pwd.pw_passwd = p;
91		p += size + 1;
92	}
93
94	if (new_pwd.pw_class != NULL) {
95		size = strlen(new_pwd.pw_class);
96		memcpy(p, new_pwd.pw_class, size);
97		new_pwd.pw_class = p;
98		p += size + 1;
99	}
100
101	if (new_pwd.pw_gecos != NULL) {
102		size = strlen(new_pwd.pw_gecos);
103		memcpy(p, new_pwd.pw_gecos, size);
104		new_pwd.pw_gecos = p;
105		p += size + 1;
106	}
107
108	if (new_pwd.pw_dir != NULL) {
109		size = strlen(new_pwd.pw_dir);
110		memcpy(p, new_pwd.pw_dir, size);
111		new_pwd.pw_dir = p;
112		p += size + 1;
113	}
114
115	if (new_pwd.pw_shell != NULL) {
116		size = strlen(new_pwd.pw_shell);
117		memcpy(p, new_pwd.pw_shell, size);
118		new_pwd.pw_shell = p;
119		p += size + 1;
120	}
121
122	memcpy(buffer, &new_pwd, sizeof(struct passwd));
123	TRACE_OUT(passwd_marshal_func);
124	return (NS_SUCCESS);
125}
126
127static int
128passwd_lookup_func(const char *key, size_t key_size, char **buffer,
129	size_t *buffer_size)
130{
131	enum nss_lookup_type lookup_type;
132	char	*login;
133	size_t	size;
134	uid_t	uid;
135
136	struct passwd *result;
137
138	TRACE_IN(passwd_lookup_func);
139	assert(buffer != NULL);
140	assert(buffer_size != NULL);
141
142	if (key_size < sizeof(enum nss_lookup_type)) {
143		TRACE_OUT(passwd_lookup_func);
144		return (NS_UNAVAIL);
145	}
146	memcpy(&lookup_type, key, sizeof(enum nss_lookup_type));
147
148	switch (lookup_type) {
149	case nss_lt_name:
150		size = key_size - sizeof(enum nss_lookup_type)	+ 1;
151		login = (char *)calloc(1, size);
152		assert(login != NULL);
153		memcpy(login, key + sizeof(enum nss_lookup_type), size - 1);
154		break;
155	case nss_lt_id:
156		if (key_size < sizeof(enum nss_lookup_type) +
157			sizeof(uid_t)) {
158			TRACE_OUT(passwd_lookup_func);
159			return (NS_UNAVAIL);
160		}
161
162		memcpy(&uid, key + sizeof(enum nss_lookup_type), sizeof(uid_t));
163		break;
164	default:
165		TRACE_OUT(passwd_lookup_func);
166		return (NS_UNAVAIL);
167	}
168
169	switch (lookup_type) {
170	case nss_lt_name:
171		result = getpwnam(login);
172		free(login);
173		break;
174	case nss_lt_id:
175		result = getpwuid(uid);
176		break;
177	default:
178		/* SHOULD NOT BE REACHED */
179		break;
180	}
181
182	if (result != NULL) {
183		passwd_marshal_func(result, NULL, buffer_size);
184		*buffer = (char *)malloc(*buffer_size);
185		assert(*buffer != NULL);
186		passwd_marshal_func(result, *buffer, buffer_size);
187	}
188
189	TRACE_OUT(passwd_lookup_func);
190	return (result == NULL ? NS_NOTFOUND : NS_SUCCESS);
191}
192
193static void *
194passwd_mp_init_func()
195{
196	TRACE_IN(passwd_mp_init_func);
197	setpwent();
198	TRACE_OUT(passwd_mp_init_func);
199
200	return (NULL);
201}
202
203static int
204passwd_mp_lookup_func(char **buffer, size_t *buffer_size, void *mdata)
205{
206	struct passwd	*result;
207
208	TRACE_IN(passwd_mp_lookup_func);
209	result = getpwent();
210	if (result != NULL) {
211		passwd_marshal_func(result, NULL, buffer_size);
212		*buffer = (char *)malloc(*buffer_size);
213		assert(*buffer != NULL);
214		passwd_marshal_func(result, *buffer, buffer_size);
215	}
216
217	TRACE_OUT(passwd_mp_lookup_func);
218	return (result == NULL ? NS_NOTFOUND : NS_SUCCESS);
219}
220
221static void
222passwd_mp_destroy_func(void *mdata)
223{
224	TRACE_IN(passwd_mp_destroy_func);
225	TRACE_OUT(passwd_mp_destroy_func);
226}
227
228struct agent *
229init_passwd_agent()
230{
231	struct common_agent	*retval;
232
233	TRACE_IN(init_passwd_agent);
234	retval = (struct common_agent *)calloc(1, sizeof(struct common_agent));
235	assert(retval != NULL);
236
237	retval->parent.name = strdup("passwd");
238	assert(retval->parent.name != NULL);
239
240	retval->parent.type = COMMON_AGENT;
241	retval->lookup_func = passwd_lookup_func;
242
243	TRACE_OUT(init_passwd_agent);
244	return ((struct agent *)retval);
245}
246
247struct agent *
248init_passwd_mp_agent()
249{
250	struct multipart_agent	*retval;
251
252	TRACE_IN(init_passwd_mp_agent);
253	retval = (struct multipart_agent *)calloc(1,
254		sizeof(struct multipart_agent));
255	assert(retval != NULL);
256
257	retval->parent.name = strdup("passwd");
258	retval->parent.type = MULTIPART_AGENT;
259	retval->mp_init_func = passwd_mp_init_func;
260	retval->mp_lookup_func = passwd_mp_lookup_func;
261	retval->mp_destroy_func = passwd_mp_destroy_func;
262	assert(retval->parent.name != NULL);
263
264	TRACE_OUT(init_passwd_mp_agent);
265	return ((struct agent *)retval);
266}
267