1/*-
2 * Copyright (c) 2002 Networks Associates Technology, Inc.
3 * All rights reserved.
4 *
5 * This software was developed for the FreeBSD Project by ThinkSec AS and
6 * NAI Labs, the Security Research Division of Network Associates, Inc.
7 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
8 * DARPA CHATS research program.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote
19 *    products derived from this software without specific prior written
20 *    permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * 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 * $FreeBSD$
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		return (yppasswd_remote(ypclnt, pwd, passwd));
123	case 1:
124		return (yppasswd_local(ypclnt, pwd));
125	default:
126		return (-1);
127	}
128}
129
130/*
131 * yppasswd_remote and yppasswd_local are quite similar but still
132 * sufficiently different that merging them into one makes the code
133 * significantly less readable, IMHO, so we keep them separate.
134 */
135
136static int
137yppasswd_local(ypclnt_t *ypclnt, const struct passwd *pwd)
138{
139	struct master_yppasswd yppwd;
140	struct rpc_err rpcerr;
141	struct netconfig *nc = NULL;
142	void *localhandle = 0;
143	CLIENT *clnt = NULL;
144	int ret, *result;
145
146	/* fill the master_yppasswd structure */
147	memset(&yppwd, 0, sizeof yppwd);
148	yppwd.newpw.pw_uid = pwd->pw_uid;
149	yppwd.newpw.pw_gid = pwd->pw_gid;
150	yppwd.newpw.pw_change = pwd->pw_change;
151	yppwd.newpw.pw_expire = pwd->pw_expire;
152	yppwd.newpw.pw_fields = pwd->pw_fields;
153	yppwd.oldpass = strdup("");
154	yppwd.domain = strdup(ypclnt->domain);
155	if ((yppwd.newpw.pw_name = strdup(pwd->pw_name)) == NULL ||
156	    (yppwd.newpw.pw_passwd = strdup(pwd->pw_passwd)) == NULL ||
157	    (yppwd.newpw.pw_class = strdup(pwd->pw_class)) == NULL ||
158	    (yppwd.newpw.pw_gecos = strdup(pwd->pw_gecos)) == NULL ||
159	    (yppwd.newpw.pw_dir = strdup(pwd->pw_dir)) == NULL ||
160	    (yppwd.newpw.pw_shell = strdup(pwd->pw_shell)) == NULL) {
161		ypclnt_error(ypclnt, __func__, strerror(errno));
162		ret = -1;
163		goto done;
164	}
165
166	/* connect to rpc.yppasswdd */
167	localhandle = setnetconfig();
168	while ((nc = getnetconfig(localhandle)) != NULL) {
169		if (nc->nc_protofmly != NULL &&
170		    strcmp(nc->nc_protofmly, NC_LOOPBACK) == 0)
171			break;
172	}
173	if (nc == NULL) {
174		ypclnt_error(ypclnt, __func__,
175		    "getnetconfig: %s", nc_sperror());
176		ret = -1;
177		goto done;
178	}
179	if ((clnt = clnt_tp_create(NULL, MASTER_YPPASSWDPROG,
180	    MASTER_YPPASSWDVERS, nc)) == NULL) {
181		ypclnt_error(ypclnt, __func__,
182		    "failed to connect to rpc.yppasswdd: %s",
183		    clnt_spcreateerror(ypclnt->server));
184		ret = -1;
185		goto done;
186	}
187	clnt->cl_auth = authunix_create_default();
188
189	/* request the update */
190	result = yppasswdproc_update_master_1(&yppwd, clnt);
191
192	/* check for RPC errors */
193	clnt_geterr(clnt, &rpcerr);
194	if (rpcerr.re_status != RPC_SUCCESS) {
195		ypclnt_error(ypclnt, __func__,
196		    "NIS password update failed: %s",
197		    clnt_sperror(clnt, ypclnt->server));
198		ret = -1;
199		goto done;
200	}
201
202	/* check the result of the update */
203	if (result == NULL || *result != 0) {
204		ypclnt_error(ypclnt, __func__,
205		    "NIS password update failed");
206		/* XXX how do we get more details? */
207		ret = -1;
208		goto done;
209	}
210
211	ypclnt_error(ypclnt, NULL, NULL);
212	ret = 0;
213
214 done:
215	if (clnt != NULL) {
216		auth_destroy(clnt->cl_auth);
217		clnt_destroy(clnt);
218	}
219	endnetconfig(localhandle);
220	free(yppwd.newpw.pw_name);
221	if (yppwd.newpw.pw_passwd != NULL) {
222		memset(yppwd.newpw.pw_passwd, 0, strlen(yppwd.newpw.pw_passwd));
223		free(yppwd.newpw.pw_passwd);
224	}
225	free(yppwd.newpw.pw_class);
226	free(yppwd.newpw.pw_gecos);
227	free(yppwd.newpw.pw_dir);
228	free(yppwd.newpw.pw_shell);
229	if (yppwd.oldpass != NULL) {
230		memset(yppwd.oldpass, 0, strlen(yppwd.oldpass));
231		free(yppwd.oldpass);
232	}
233	return (ret);
234}
235
236static int
237yppasswd_remote(ypclnt_t *ypclnt, const struct passwd *pwd, const char *passwd)
238{
239	struct yppasswd yppwd;
240	struct rpc_err rpcerr;
241	CLIENT *clnt = NULL;
242	int ret, *result;
243
244	/* fill the yppasswd structure */
245	memset(&yppwd, 0, sizeof yppwd);
246	yppwd.newpw.pw_uid = pwd->pw_uid;
247	yppwd.newpw.pw_gid = pwd->pw_gid;
248	if ((yppwd.newpw.pw_name = strdup(pwd->pw_name)) == NULL ||
249	    (yppwd.newpw.pw_passwd = strdup(pwd->pw_passwd)) == NULL ||
250	    (yppwd.newpw.pw_gecos = strdup(pwd->pw_gecos)) == NULL ||
251	    (yppwd.newpw.pw_dir = strdup(pwd->pw_dir)) == NULL ||
252	    (yppwd.newpw.pw_shell = strdup(pwd->pw_shell)) == NULL ||
253	    (yppwd.oldpass = strdup(passwd ? passwd : "")) == NULL) {
254		ypclnt_error(ypclnt, __func__, strerror(errno));
255		ret = -1;
256		goto done;
257	}
258
259	/* connect to rpc.yppasswdd */
260	clnt = clnt_create(ypclnt->server, YPPASSWDPROG, YPPASSWDVERS, "udp");
261	if (clnt == NULL) {
262		ypclnt_error(ypclnt, __func__,
263		    "failed to connect to rpc.yppasswdd: %s",
264		    clnt_spcreateerror(ypclnt->server));
265		ret = -1;
266		goto done;
267	}
268	clnt->cl_auth = authunix_create_default();
269
270	/* request the update */
271	result = yppasswdproc_update_1(&yppwd, clnt);
272
273	/* check for RPC errors */
274	clnt_geterr(clnt, &rpcerr);
275	if (rpcerr.re_status != RPC_SUCCESS) {
276		ypclnt_error(ypclnt, __func__,
277		    "NIS password update failed: %s",
278		    clnt_sperror(clnt, ypclnt->server));
279		ret = -1;
280		goto done;
281	}
282
283	/* check the result of the update */
284	if (result == NULL || *result != 0) {
285		ypclnt_error(ypclnt, __func__,
286		    "NIS password update failed");
287		/* XXX how do we get more details? */
288		ret = -1;
289		goto done;
290	}
291
292	ypclnt_error(ypclnt, NULL, NULL);
293	ret = 0;
294
295 done:
296	if (clnt != NULL) {
297		auth_destroy(clnt->cl_auth);
298		clnt_destroy(clnt);
299	}
300	free(yppwd.newpw.pw_name);
301	if (yppwd.newpw.pw_passwd != NULL) {
302		memset(yppwd.newpw.pw_passwd, 0, strlen(yppwd.newpw.pw_passwd));
303		free(yppwd.newpw.pw_passwd);
304	}
305	free(yppwd.newpw.pw_gecos);
306	free(yppwd.newpw.pw_dir);
307	free(yppwd.newpw.pw_shell);
308	if (yppwd.oldpass != NULL) {
309		memset(yppwd.oldpass, 0, strlen(yppwd.oldpass));
310		free(yppwd.oldpass);
311	}
312	return (ret);
313}
314