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/*
32 * Copyright (C) 1986, 1989, Sun Microsystems, Inc.
33 */
34
35/*
36 * Administrative tool to add a new user to the publickey database
37 */
38#include <stdio.h>
39#include <stdlib.h>
40#include <unistd.h>
41#include <rpc/rpc.h>
42#include <rpc/key_prot.h>
43#ifdef YP
44#include <rpcsvc/yp_prot.h>
45#include <rpcsvc/ypclnt.h>
46#include <sys/wait.h>
47#include <netdb.h>
48#endif	/* YP */
49#include <pwd.h>
50#include <string.h>
51#include <sys/resource.h>
52#include "ypupdated_extern.h"
53
54#ifdef YP
55#define	MAXMAPNAMELEN 256
56#else
57#define	YPOP_CHANGE 1			/* change, do not add */
58#define	YPOP_INSERT 2			/* add, do not change */
59#define	YPOP_DELETE 3			/* delete this entry */
60#define	YPOP_STORE  4			/* add, or change */
61#endif
62
63#ifdef YP
64static char SHELL[] = "/bin/sh";
65static char YPDBPATH[]="/var/yp";	/* This is defined but not used! */
66static char PKMAP[] = "publickey.byname";
67static char UPDATEFILE[] = "updaters";
68static char PKFILE[] = "/etc/publickey";
69#endif	/* YP */
70
71#ifdef YP
72static int _openchild(char *, FILE **, FILE **);
73
74/*
75 * Determine if requester is allowed to update the given map,
76 * and update it if so. Returns the yp status, which is zero
77 * if there is no access violation.
78 */
79int
80mapupdate(char *requester, char *mapname, u_int op, u_int keylen, char *key,
81    u_int datalen, char *data)
82{
83	char updater[MAXMAPNAMELEN + 40];
84	FILE *childargs;
85	FILE *childrslt;
86#ifdef WEXITSTATUS
87	int status;
88#else
89	union wait status;
90#endif
91	pid_t pid;
92	u_int yperrno;
93
94
95#ifdef DEBUG
96	printf("%s %s\n", key, data);
97#endif
98	(void)sprintf(updater, "make -s -f %s/%s %s", YPDBPATH, /* !!! */
99					UPDATEFILE, mapname);
100	pid = _openchild(updater, &childargs, &childrslt);
101	if (pid < 0) {
102		return (YPERR_YPERR);
103	}
104
105	/*
106	 * Write to child
107	 */
108	(void)fprintf(childargs, "%s\n", requester);
109	(void)fprintf(childargs, "%u\n", op);
110	(void)fprintf(childargs, "%u\n", keylen);
111	(void)fwrite(key, (int)keylen, 1, childargs);
112	(void)fprintf(childargs, "\n");
113	(void)fprintf(childargs, "%u\n", datalen);
114	(void)fwrite(data, (int)datalen, 1, childargs);
115	(void)fprintf(childargs, "\n");
116	(void)fclose(childargs);
117
118	/*
119	 * Read from child
120	 */
121	(void)fscanf(childrslt, "%d", &yperrno);
122	(void)fclose(childrslt);
123
124	(void)wait(&status);
125#ifdef WEXITSTATUS
126	if (WEXITSTATUS(status) != 0)
127#else
128	if (status.w_retcode != 0)
129#endif
130		return (YPERR_YPERR);
131	return (yperrno);
132}
133
134/*
135 * returns pid, or -1 for failure
136 */
137static int
138_openchild(char *command, FILE **fto, FILE **ffrom)
139{
140	int i;
141	pid_t pid;
142	int pdto[2];
143	int pdfrom[2];
144	char *com;
145	struct rlimit rl;
146
147	if (pipe(pdto) < 0) {
148		goto error1;
149	}
150	if (pipe(pdfrom) < 0) {
151		goto error2;
152	}
153	switch (pid = fork()) {
154	case -1:
155		goto error3;
156
157	case 0:
158		/*
159		 * child: read from pdto[0], write into pdfrom[1]
160		 */
161		(void)close(0);
162		(void)dup(pdto[0]);
163		(void)close(1);
164		(void)dup(pdfrom[1]);
165		getrlimit(RLIMIT_NOFILE, &rl);
166		for (i = rl.rlim_max - 1; i >= 3; i--) {
167			(void) close(i);
168		}
169		com = malloc((unsigned) strlen(command) + 6);
170		if (com == NULL) {
171			_exit(~0);
172		}
173		(void)sprintf(com, "exec %s", command);
174		execl(SHELL, basename(SHELL), "-c", com, (char *)NULL);
175		_exit(~0);
176
177	default:
178		/*
179		 * parent: write into pdto[1], read from pdfrom[0]
180		 */
181		*fto = fdopen(pdto[1], "w");
182		(void)close(pdto[0]);
183		*ffrom = fdopen(pdfrom[0], "r");
184		(void)close(pdfrom[1]);
185		break;
186	}
187	return (pid);
188
189	/*
190	 * error cleanup and return
191	 */
192error3:
193	(void)close(pdfrom[0]);
194	(void)close(pdfrom[1]);
195error2:
196	(void)close(pdto[0]);
197	(void)close(pdto[1]);
198error1:
199	return (-1);
200}
201
202static char *
203basename(char *path)
204{
205	char *p;
206
207	p = strrchr(path, '/');
208	if (p == NULL) {
209		return (path);
210	} else {
211		return (p + 1);
212	}
213}
214
215#else /* YP */
216
217static int match(char *, char *);
218
219/*
220 * Determine if requester is allowed to update the given map,
221 * and update it if so. Returns the status, which is zero
222 * if there is no access violation. This function updates
223 * the local file and then shuts up.
224 */
225int
226localupdate(char *name, char *filename, u_int op, u_int keylen __unused,
227    char *key, u_int datalen __unused, char *data)
228{
229	char line[256];
230	FILE *rf;
231	FILE *wf;
232	char *tmpname;
233	int err;
234
235	/*
236	 * Check permission
237	 */
238	if (strcmp(name, key) != 0) {
239		return (ERR_ACCESS);
240	}
241	if (strcmp(name, "nobody") == 0) {
242		/*
243		 * Can't change "nobody"s key.
244		 */
245		return (ERR_ACCESS);
246	}
247
248	/*
249	 * Open files
250	 */
251	tmpname = malloc(strlen(filename) + 4);
252	if (tmpname == NULL) {
253		return (ERR_MALLOC);
254	}
255	sprintf(tmpname, "%s.tmp", filename);
256	rf = fopen(filename, "r");
257	if (rf == NULL) {
258		err = ERR_READ;
259		goto cleanup;
260	}
261	wf = fopen(tmpname, "w");
262	if (wf == NULL) {
263		fclose(rf);
264		err = ERR_WRITE;
265		goto cleanup;
266	}
267	err = -1;
268	while (fgets(line, sizeof (line), rf)) {
269		if (err < 0 && match(line, name)) {
270			switch (op) {
271			case YPOP_INSERT:
272				err = ERR_KEY;
273				break;
274			case YPOP_STORE:
275			case YPOP_CHANGE:
276				fprintf(wf, "%s %s\n", key, data);
277				err = 0;
278				break;
279			case YPOP_DELETE:
280				/* do nothing */
281				err = 0;
282				break;
283			}
284		} else {
285			fputs(line, wf);
286		}
287	}
288	if (err < 0) {
289		switch (op) {
290		case YPOP_CHANGE:
291		case YPOP_DELETE:
292			err = ERR_KEY;
293			break;
294		case YPOP_INSERT:
295		case YPOP_STORE:
296			err = 0;
297			fprintf(wf, "%s %s\n", key, data);
298			break;
299		}
300	}
301	fclose(wf);
302	fclose(rf);
303	if (err == 0) {
304		if (rename(tmpname, filename) < 0) {
305			err = ERR_DBASE;
306			goto cleanup;
307		}
308	} else {
309		if (unlink(tmpname) < 0) {
310			err = ERR_DBASE;
311			goto cleanup;
312		}
313	}
314cleanup:
315	free(tmpname);
316	return (err);
317}
318
319static int
320match(char *line, char *name)
321{
322	int len;
323
324	len = strlen(name);
325	return (strncmp(line, name, len) == 0 &&
326		(line[len] == ' ' || line[len] == '\t'));
327}
328#endif /* !YP */
329