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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
42 static int passwd_marshal_func(struct passwd *, char *, size_t *);
43 static int passwd_lookup_func(const char *, size_t, char **, size_t *);
44 static void *passwd_mp_init_func(void);
45 static int passwd_mp_lookup_func(char **, size_t *, void *);
46 static void passwd_mp_destroy_func(void *mdata);
47
48 static int
49 passwd_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
129 static int
130 passwd_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
195 static void *
196 passwd_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
205 static int
206 passwd_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
223 static void
224 passwd_mp_destroy_func(void *mdata)
225 {
226         TRACE_IN(passwd_mp_destroy_func);
227         TRACE_OUT(passwd_mp_destroy_func);
228 }
229
230 struct agent *
231 init_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
249 struct agent *
250 init_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 }