update.c revision 90297 
1/*
2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
3 * unrestricted use provided that this legend is included on all tape
4 * media and as a part of the software program in whole or part.  Users
5 * may copy or modify Sun RPC without charge, but are not authorized
6 * to license or distribute it to anyone else except as part of a product or
7 * program developed by the user or with the express written consent of
8 * Sun Microsystems, Inc.
9 *
10 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
11 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
12 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
13 *
14 * Sun RPC is provided with no support and without any obligation on the
15 * part of Sun Microsystems, Inc. to assist in its use, correction,
16 * modification or enhancement.
17 *
18 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
19 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
20 * OR ANY PART THEREOF.
21 *
22 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
23 * or profits or other special, indirect and consequential damages, even if
24 * Sun has been advised of the possibility of such damages.
25 *
26 * Sun Microsystems, Inc.
27 * 2550 Garcia Avenue
28 * Mountain View, California  94043
29 */
30
31#ifndef lint
32#if 0
33static	char sccsid[] = "@(#)update.c 1.2 91/03/11 Copyr 1986 Sun Micro";
34#endif
35static const char rcsid[] =
36  "$FreeBSD: head/usr.sbin/rpc.ypupdated/update.c 90297 2002-02-06 13:30:31Z des $";
37#endif /* not lint */
38
39/*
40 * Copyright (C) 1986, 1989, Sun Microsystems, Inc.
41 */
42
43/*
44 * Administrative tool to add a new user to the publickey database
45 */
46#include <stdio.h>
47#include <stdlib.h>
48#include <unistd.h>
49#include <rpc/rpc.h>
50#include <rpc/key_prot.h>
51#ifdef YP
52#include <rpcsvc/yp_prot.h>
53#include <rpcsvc/ypclnt.h>
54#include <sys/wait.h>
55#include <netdb.h>
56#endif	/* YP */
57#include <pwd.h>
58#include <string.h>
59#include <sys/resource.h>
60#include <stdlib.h>
61#include "ypupdated_extern.h"
62
63#ifdef YP
64#define	MAXMAPNAMELEN 256
65#else
66#define	YPOP_CHANGE 1			/* change, do not add */
67#define	YPOP_INSERT 2			/* add, do not change */
68#define	YPOP_DELETE 3			/* delete this entry */
69#define	YPOP_STORE  4			/* add, or change */
70#endif
71
72#ifdef YP
73static char SHELL[] = "/bin/sh";
74static char YPDBPATH[]="/var/yp";	/* This is defined but not used! */
75static char PKMAP[] = "publickey.byname";
76static char UPDATEFILE[] = "updaters";
77static char PKFILE[] = "/etc/publickey";
78#endif	/* YP */
79
80#ifdef YP
81static int _openchild(char *, FILE **, FILE **);
82
83/*
84 * Determine if requester is allowed to update the given map,
85 * and update it if so. Returns the yp status, which is zero
86 * if there is no access violation.
87 */
88mapupdate(requester, mapname, op, keylen, key, datalen, data)
89	char *requester;
90	char *mapname;
91	u_int op;
92	u_int keylen;
93	char *key;
94	u_int datalen;
95	char *data;
96{
97	char updater[MAXMAPNAMELEN + 40];
98	FILE *childargs;
99	FILE *childrslt;
100#ifdef WEXITSTATUS
101	int status;
102#else
103	union wait status;
104#endif
105	pid_t pid;
106	u_int yperrno;
107
108
109#ifdef DEBUG
110	printf("%s %s\n", key, data);
111#endif
112	(void)sprintf(updater, "make -s -f %s/%s %s", YPDBPATH, /* !!! */
113					UPDATEFILE, mapname);
114	pid = _openchild(updater, &childargs, &childrslt);
115	if (pid < 0) {
116		return (YPERR_YPERR);
117	}
118
119	/*
120	 * Write to child
121	 */
122	(void)fprintf(childargs, "%s\n", requester);
123	(void)fprintf(childargs, "%u\n", op);
124	(void)fprintf(childargs, "%u\n", keylen);
125	(void)fwrite(key, (int)keylen, 1, childargs);
126	(void)fprintf(childargs, "\n");
127	(void)fprintf(childargs, "%u\n", datalen);
128	(void)fwrite(data, (int)datalen, 1, childargs);
129	(void)fprintf(childargs, "\n");
130	(void)fclose(childargs);
131
132	/*
133	 * Read from child
134	 */
135	(void)fscanf(childrslt, "%d", &yperrno);
136	(void)fclose(childrslt);
137
138	(void)wait(&status);
139#ifdef WEXITSTATUS
140	if (WEXITSTATUS(status) != 0) {
141#else
142	if (status.w_retcode != 0) {
143#endif
144		return (YPERR_YPERR);
145	}
146	return (yperrno);
147}
148
149/*
150 * returns pid, or -1 for failure
151 */
152static
153_openchild(command, fto, ffrom)
154	char *command;
155	FILE **fto;
156	FILE **ffrom;
157{
158	int i;
159	pid_t pid;
160	int pdto[2];
161	int pdfrom[2];
162	char *com;
163	struct rlimit rl;
164
165	if (pipe(pdto) < 0) {
166		goto error1;
167	}
168	if (pipe(pdfrom) < 0) {
169		goto error2;
170	}
171#ifdef VFORK
172	switch (pid = vfork()) {
173#else
174	switch (pid = fork()) {
175#endif
176	case -1:
177		goto error3;
178
179	case 0:
180		/*
181		 * child: read from pdto[0], write into pdfrom[1]
182		 */
183		(void)close(0);
184		(void)dup(pdto[0]);
185		(void)close(1);
186		(void)dup(pdfrom[1]);
187		getrlimit(RLIMIT_NOFILE, &rl);
188		for (i = rl.rlim_max - 1; i >= 3; i--) {
189			(void) close(i);
190		}
191		com = malloc((unsigned) strlen(command) + 6);
192		if (com == NULL) {
193			_exit(~0);
194		}
195		(void)sprintf(com, "exec %s", command);
196		execl(SHELL, basename(SHELL), "-c", com, (char *)NULL);
197		_exit(~0);
198
199	default:
200		/*
201		 * parent: write into pdto[1], read from pdfrom[0]
202		 */
203		*fto = fdopen(pdto[1], "w");
204		(void)close(pdto[0]);
205		*ffrom = fdopen(pdfrom[0], "r");
206		(void)close(pdfrom[1]);
207		break;
208	}
209	return (pid);
210
211	/*
212	 * error cleanup and return
213	 */
214error3:
215	(void)close(pdfrom[0]);
216	(void)close(pdfrom[1]);
217error2:
218	(void)close(pdto[0]);
219	(void)close(pdto[1]);
220error1:
221	return (-1);
222}
223
224static char *
225basename(path)
226	char *path;
227{
228	char *p;
229
230	p = strrchr(path, '/');
231	if (p == NULL) {
232		return (path);
233	} else {
234		return (p + 1);
235	}
236}
237
238#else /* YP */
239
240#ifdef foo
241#define	ERR_ACCESS	1
242#define	ERR_MALLOC	2
243#define	ERR_READ	3
244#define	ERR_WRITE	4
245#define	ERR_DBASE	5
246#define	ERR_KEY		6
247extern char *malloc();
248#endif
249
250static int match(char *, char *);
251
252/*
253 * Determine if requester is allowed to update the given map,
254 * and update it if so. Returns the status, which is zero
255 * if there is no access violation. This function updates
256 * the local file and then shuts up.
257 */
258int
259localupdate(name, filename, op, keylen, key, datalen, data)
260	char *name;	/* Name of the requestor */
261	char *filename;
262	u_int op;
263	u_int keylen;	/* Not used */
264	char *key;
265	u_int datalen;	/* Not used */
266	char *data;
267{
268	char line[256];
269	FILE *rf;
270	FILE *wf;
271	char *tmpname;
272	int err;
273
274	/*
275	 * Check permission
276	 */
277	if (strcmp(name, key) != 0) {
278		return (ERR_ACCESS);
279	}
280	if (strcmp(name, "nobody") == 0) {
281		/*
282		 * Can't change "nobody"s key.
283		 */
284		return (ERR_ACCESS);
285	}
286
287	/*
288	 * Open files
289	 */
290	tmpname = malloc(strlen(filename) + 4);
291	if (tmpname == NULL) {
292		return (ERR_MALLOC);
293	}
294	sprintf(tmpname, "%s.tmp", filename);
295	rf = fopen(filename, "r");
296	if (rf == NULL) {
297		return (ERR_READ);
298	}
299	wf = fopen(tmpname, "w");
300	if (wf == NULL) {
301		return (ERR_WRITE);
302	}
303	err = -1;
304	while (fgets(line, sizeof (line), rf)) {
305		if (err < 0 && match(line, name)) {
306			switch (op) {
307			case YPOP_INSERT:
308				err = ERR_KEY;
309				break;
310			case YPOP_STORE:
311			case YPOP_CHANGE:
312				fprintf(wf, "%s %s\n", key, data);
313				err = 0;
314				break;
315			case YPOP_DELETE:
316				/* do nothing */
317				err = 0;
318				break;
319			}
320		} else {
321			fputs(line, wf);
322		}
323	}
324	if (err < 0) {
325		switch (op) {
326		case YPOP_CHANGE:
327		case YPOP_DELETE:
328			err = ERR_KEY;
329			break;
330		case YPOP_INSERT:
331		case YPOP_STORE:
332			err = 0;
333			fprintf(wf, "%s %s\n", key, data);
334			break;
335		}
336	}
337	fclose(wf);
338	fclose(rf);
339	if (err == 0) {
340		if (rename(tmpname, filename) < 0) {
341			return (ERR_DBASE);
342		}
343	} else {
344		if (unlink(tmpname) < 0) {
345			return (ERR_DBASE);
346		}
347	}
348	return (err);
349}
350
351static int
352match(line, name)
353	char *line;
354	char *name;
355{
356	int len;
357
358	len = strlen(name);
359	return (strncmp(line, name, len) == 0 &&
360		(line[len] == ' ' || line[len] == '\t'));
361}
362#endif /* !YP */
363
364