ypclnt_passwd.c revision 116393 
1234285Sdim/*-
2234285Sdim * Copyright (c) 2002 Networks Associates Technology, Inc.
3234285Sdim * All rights reserved.
4234285Sdim *
5234285Sdim * This software was developed for the FreeBSD Project by ThinkSec AS and
6234285Sdim * NAI Labs, the Security Research Division of Network Associates, Inc.
7234285Sdim * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
8234285Sdim * DARPA CHATS research program.
9234285Sdim *
10234285Sdim * Redistribution and use in source and binary forms, with or without
11234285Sdim * modification, are permitted provided that the following conditions
12234285Sdim * are met:
13234285Sdim * 1. Redistributions of source code must retain the above copyright
14234285Sdim *    notice, this list of conditions and the following disclaimer.
15234285Sdim * 2. Redistributions in binary form must reproduce the above copyright
16234285Sdim *    notice, this list of conditions and the following disclaimer in the
17234285Sdim *    documentation and/or other materials provided with the distribution.
18234285Sdim * 3. The name of the author may not be used to endorse or promote
19234285Sdim *    products derived from this software without specific prior written
20234285Sdim *    permission.
21234285Sdim *
22234285Sdim * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23234285Sdim * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24234285Sdim * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25234285Sdim * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26234285Sdim * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * $FreeBSD: head/lib/libypclnt/ypclnt_passwd.c 116393 2003-06-15 10:36:53Z mbr $
35 */
36
37#include <sys/types.h>
38#include <sys/socket.h>
39#include <netinet/in.h>
40
41#include <err.h>
42#include <errno.h>
43#include <netconfig.h>
44#include <netdb.h>
45#include <pwd.h>
46#include <stdlib.h>
47#include <string.h>
48#include <unistd.h>
49
50#include <rpcsvc/ypclnt.h>
51#include <rpcsvc/yppasswd.h>
52
53#include "ypclnt.h"
54#include "yppasswd_private.h"
55
56static int yppasswd_remote(ypclnt_t *, const struct passwd *, const char *);
57static int yppasswd_local(ypclnt_t *, const struct passwd *);
58
59/*
60 * Determines the availability of rpc.yppasswdd.  Returns -1 for not
61 * available (or unable to determine), 0 for available, 1 for available in
62 * master mode.
63 */
64int
65ypclnt_havepasswdd(ypclnt_t *ypclnt)
66{
67	struct netconfig *nc = NULL;
68	void *localhandle = 0;
69	CLIENT *clnt = NULL;
70	int ret;
71
72	/* check if rpc.yppasswdd is running */
73	if (getrpcport(ypclnt->server, YPPASSWDPROG,
74		YPPASSWDPROC_UPDATE, IPPROTO_UDP) == 0) {
75		ypclnt_error(ypclnt, __func__, "no rpc.yppasswdd on server");
76		return (-1);
77	}
78
79	/* if we're not root, use remote method */
80	if (getuid() != 0)
81		return (0);
82
83	/* try to connect to rpc.yppasswdd */
84	localhandle = setnetconfig();
85	while ((nc = getnetconfig(localhandle)) != NULL) {
86		if (nc->nc_protofmly != NULL &&
87			strcmp(nc->nc_protofmly, NC_LOOPBACK) == 0)
88				break;
89	}
90	if (nc == NULL) {
91		ypclnt_error(ypclnt, __func__,
92		    "getnetconfig: %s", nc_sperror());
93		ret = 0;
94		goto done;
95	}
96	if ((clnt = clnt_tp_create(NULL, MASTER_YPPASSWDPROG,
97	    MASTER_YPPASSWDVERS, nc)) == NULL) {
98		ypclnt_error(ypclnt, __func__,
99		    "failed to connect to rpc.yppasswdd: %s",
100		    clnt_spcreateerror(ypclnt->server));
101		ret = 0;
102		goto done;
103	} else
104		ret = 1;
105
106done:
107	if (clnt != NULL) {
108		clnt_destroy(clnt);
109	}
110	endnetconfig(localhandle);
111	return (ret);
112}
113
114/*
115 * Updates the NIS user information for the specified user.
116 */
117int
118ypclnt_passwd(ypclnt_t *ypclnt, const struct passwd *pwd, const char *passwd)
119{
120	switch (ypclnt_havepasswdd(ypclnt)) {
121	case 0:
122		YPCLNT_DEBUG("using remote update method");
123		return (yppasswd_remote(ypclnt, pwd, passwd));
124	case 1:
125		YPCLNT_DEBUG("using local update method");
126		return (yppasswd_local(ypclnt, pwd));
127	default:
128		YPCLNT_DEBUG("no rpc.yppasswdd");
129		return (-1);
130	}
131}
132
133/*
134 * yppasswd_remote and yppasswd_local are quite similar but still
135 * sufficiently different that merging them into one makes the code
136 * significantly less readable, IMHO, so we keep them separate.
137 */
138
139static int
140yppasswd_local(ypclnt_t *ypclnt, const struct passwd *pwd)
141{
142	struct master_yppasswd yppwd;
143	struct rpc_err rpcerr;
144	struct netconfig *nc = NULL;
145	void *localhandle = 0;
146	CLIENT *clnt = NULL;
147	int ret, *result;
148
149	/* fill the master_yppasswd structure */
150	memset(&yppwd, 0, sizeof yppwd);
151	yppwd.newpw.pw_uid = pwd->pw_uid;
152	yppwd.newpw.pw_gid = pwd->pw_gid;
153	yppwd.newpw.pw_change = pwd->pw_change;
154	yppwd.newpw.pw_expire = pwd->pw_expire;
155	yppwd.newpw.pw_fields = pwd->pw_fields;
156	yppwd.oldpass = strdup("");
157	yppwd.domain = strdup(ypclnt->domain);
158	if ((yppwd.newpw.pw_name = strdup(pwd->pw_name)) == NULL ||
159	    (yppwd.newpw.pw_passwd = strdup(pwd->pw_passwd)) == NULL ||
160	    (yppwd.newpw.pw_class = strdup(pwd->pw_class)) == NULL ||
161	    (yppwd.newpw.pw_gecos = strdup(pwd->pw_gecos)) == NULL ||
162	    (yppwd.newpw.pw_dir = strdup(pwd->pw_dir)) == NULL ||
163	    (yppwd.newpw.pw_shell = strdup(pwd->pw_shell)) == NULL) {
164		ypclnt_error(ypclnt, __func__, strerror(errno));
165		ret = -1;
166		goto done;
167	}
168
169	/* connect to rpc.yppasswdd */
170	localhandle = setnetconfig();
171	while ((nc = getnetconfig(localhandle)) != NULL) {
172		if (nc->nc_protofmly != NULL &&
173		    strcmp(nc->nc_protofmly, NC_LOOPBACK) == 0)
174			break;
175	}
176	if (nc == NULL) {
177		ypclnt_error(ypclnt, __func__,
178		    "getnetconfig: %s", nc_sperror());
179		ret = -1;
180		goto done;
181	}
182	if ((clnt = clnt_tp_create(NULL, MASTER_YPPASSWDPROG,
183	    MASTER_YPPASSWDVERS, nc)) == NULL) {
184		ypclnt_error(ypclnt, __func__,
185		    "failed to connect to rpc.yppasswdd: %s",
186		    clnt_spcreateerror(ypclnt->server));
187		ret = -1;
188		goto done;
189	}
190	clnt->cl_auth = authunix_create_default();
191
192	/* request the update */
193	result = yppasswdproc_update_master_1(&yppwd, clnt);
194
195	/* check for RPC errors */
196	clnt_geterr(clnt, &rpcerr);
197	if (rpcerr.re_status != RPC_SUCCESS) {
198		ypclnt_error(ypclnt, __func__,
199		    "NIS password update failed: %s",
200		    clnt_sperror(clnt, ypclnt->server));
201		ret = -1;
202		goto done;
203	}
204
205	/* check the result of the update */
206	if (result == NULL || *result != 0) {
207		ypclnt_error(ypclnt, __func__,
208		    "NIS password update failed");
209		/* XXX how do we get more details? */
210		ret = -1;
211		goto done;
212	}
213
214	ypclnt_error(ypclnt, NULL, NULL);
215	ret = 0;
216
217 done:
218	if (clnt != NULL) {
219		auth_destroy(clnt->cl_auth);
220		clnt_destroy(clnt);
221	}
222	endnetconfig(localhandle);
223	free(yppwd.newpw.pw_name);
224	if (yppwd.newpw.pw_passwd != NULL) {
225		memset(yppwd.newpw.pw_passwd, 0, strlen(yppwd.newpw.pw_passwd));
226		free(yppwd.newpw.pw_passwd);
227	}
228	free(yppwd.newpw.pw_class);
229	free(yppwd.newpw.pw_gecos);
230	free(yppwd.newpw.pw_dir);
231	free(yppwd.newpw.pw_shell);
232	if (yppwd.oldpass != NULL) {
233		memset(yppwd.oldpass, 0, strlen(yppwd.oldpass));
234		free(yppwd.oldpass);
235	}
236	return (ret);
237}
238
239static int
240yppasswd_remote(ypclnt_t *ypclnt, const struct passwd *pwd, const char *passwd)
241{
242	struct yppasswd yppwd;
243	struct rpc_err rpcerr;
244	CLIENT *clnt = NULL;
245	int ret, *result;
246
247	/* fill the yppasswd structure */
248	memset(&yppwd, 0, sizeof yppwd);
249	yppwd.newpw.pw_uid = pwd->pw_uid;
250	yppwd.newpw.pw_gid = pwd->pw_gid;
251	if ((yppwd.newpw.pw_name = strdup(pwd->pw_name)) == NULL ||
252	    (yppwd.newpw.pw_passwd = strdup(pwd->pw_passwd)) == NULL ||
253	    (yppwd.newpw.pw_gecos = strdup(pwd->pw_gecos)) == NULL ||
254	    (yppwd.newpw.pw_dir = strdup(pwd->pw_dir)) == NULL ||
255	    (yppwd.newpw.pw_shell = strdup(pwd->pw_shell)) == NULL ||
256	    (yppwd.oldpass = strdup(passwd ? passwd : "")) == NULL) {
257		ypclnt_error(ypclnt, __func__, strerror(errno));
258		ret = -1;
259		goto done;
260	}
261
262	/* connect to rpc.yppasswdd */
263	clnt = clnt_create(ypclnt->server, YPPASSWDPROG, YPPASSWDVERS, "udp");
264	if (clnt == NULL) {
265		ypclnt_error(ypclnt, __func__,
266		    "failed to connect to rpc.yppasswdd: %s",
267		    clnt_spcreateerror(ypclnt->server));
268		ret = -1;
269		goto done;
270	}
271	clnt->cl_auth = authunix_create_default();
272
273	/* request the update */
274	result = yppasswdproc_update_1(&yppwd, clnt);
275
276	/* check for RPC errors */
277	clnt_geterr(clnt, &rpcerr);
278	if (rpcerr.re_status != RPC_SUCCESS) {
279		ypclnt_error(ypclnt, __func__,
280		    "NIS password update failed: %s",
281		    clnt_sperror(clnt, ypclnt->server));
282		ret = -1;
283		goto done;
284	}
285
286	/* check the result of the update */
287	if (result == NULL || *result != 0) {
288		ypclnt_error(ypclnt, __func__,
289		    "NIS password update failed");
290		/* XXX how do we get more details? */
291		ret = -1;
292		goto done;
293	}
294
295	ypclnt_error(ypclnt, NULL, NULL);
296	ret = 0;
297
298 done:
299	if (clnt != NULL) {
300		auth_destroy(clnt->cl_auth);
301		clnt_destroy(clnt);
302	}
303	free(yppwd.newpw.pw_name);
304	if (yppwd.newpw.pw_passwd != NULL) {
305		memset(yppwd.newpw.pw_passwd, 0, strlen(yppwd.newpw.pw_passwd));
306		free(yppwd.newpw.pw_passwd);
307	}
308	free(yppwd.newpw.pw_gecos);
309	free(yppwd.newpw.pw_dir);
310	free(yppwd.newpw.pw_shell);
311	if (yppwd.oldpass != NULL) {
312		memset(yppwd.oldpass, 0, strlen(yppwd.oldpass));
313		free(yppwd.oldpass);
314	}
315	return (ret);
316}
317