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
39#include <sys/types.h>
40#include <sys/time.h>
41#include <sys/resource.h>
42
43#include <rpc/rpc.h>
44#include <rpc/key_prot.h>
45
46#ifdef YP
47#include <sys/wait.h>
48#include <rpcsvc/yp_prot.h>
49#include <rpcsvc/ypclnt.h>
50#include <netdb.h>
51#endif	/* YP */
52
53#include <pwd.h>
54#include <stdio.h>
55#include <stdlib.h>
56#include <string.h>
57#include <unistd.h>
58
59#include "extern.h"
60
61#ifdef YP
62static char SHELL[] = "/bin/sh";
63static char YPDBPATH[]="/var/yp";	/* This is defined but not used! */
64static char UPDATEFILE[] = "updaters";
65
66static int _openchild(char *, FILE **, FILE **);
67static char *basename(char *path);
68
69/*
70 * Determine if requester is allowed to update the given map,
71 * and update it if so. Returns the yp status, which is zero
72 * if there is no access violation.
73 */
74int
75mapupdate(char *requester, char *mapname, u_int op, u_int keylen,
76    char *key, u_int datalen, char *data)
77{
78	char updater[MAXMAPNAMELEN + 40];
79	FILE *childargs;
80	FILE *childrslt;
81#ifdef WEXITSTATUS
82	int status;
83#else
84	union wait status;
85#endif
86	pid_t pid;
87	u_int yperrno;
88
89
90#ifdef DEBUG
91	printf("%s %s\n", key, data);
92#endif
93	(void)sprintf(updater, "make -s -f %s/%s %s", YPDBPATH, /* !!! */
94					UPDATEFILE, mapname);
95	pid = _openchild(updater, &childargs, &childrslt);
96	if (pid < 0) {
97		return (YPERR_YPERR);
98	}
99
100	/*
101	 * Write to child
102	 */
103	(void)fprintf(childargs, "%s\n", requester);
104	(void)fprintf(childargs, "%u\n", op);
105	(void)fprintf(childargs, "%u\n", keylen);
106	(void)fwrite(key, (int)keylen, 1, childargs);
107	(void)fprintf(childargs, "\n");
108	(void)fprintf(childargs, "%u\n", datalen);
109	(void)fwrite(data, (int)datalen, 1, childargs);
110	(void)fprintf(childargs, "\n");
111	(void)fclose(childargs);
112
113	/*
114	 * Read from child
115	 */
116	(void)fscanf(childrslt, "%d", &yperrno);
117	(void)fclose(childrslt);
118
119	(void)wait(&status);
120#ifdef WEXITSTATUS
121	if (WEXITSTATUS(status) != 0) {
122#else
123	if (status.w_retcode != 0) {
124#endif
125		return (YPERR_YPERR);
126	}
127	return (yperrno);
128}
129
130/*
131 * returns pid, or -1 for failure
132 */
133static pid_t
134_openchild(char *command, FILE **fto, FILE **ffrom)
135{
136	int i;
137	pid_t pid;
138	int pdto[2];
139	int pdfrom[2];
140	char *com;
141	struct rlimit rl;
142
143	if (pipe(pdto) < 0) {
144		goto error1;
145	}
146	if (pipe(pdfrom) < 0) {
147		goto error2;
148	}
149	switch (pid = fork()) {
150	case -1:
151		goto error3;
152
153	case 0:
154		/*
155		 * child: read from pdto[0], write into pdfrom[1]
156		 */
157		(void)close(0);
158		(void)dup(pdto[0]);
159		(void)close(1);
160		(void)dup(pdfrom[1]);
161		getrlimit(RLIMIT_NOFILE, &rl);
162		for (i = rl.rlim_max - 1; i >= 3; i--) {
163			(void) close(i);
164		}
165		com = malloc((unsigned) strlen(command) + 6);
166		if (com == NULL) {
167			_exit(~0);
168		}
169		(void)sprintf(com, "exec %s", command);
170		execl(SHELL, basename(SHELL), "-c", com, (char *)NULL);
171		_exit(~0);
172
173	default:
174		/*
175		 * parent: write into pdto[1], read from pdfrom[0]
176		 */
177		*fto = fdopen(pdto[1], "w");
178		(void)close(pdto[0]);
179		*ffrom = fdopen(pdfrom[0], "r");
180		(void)close(pdfrom[1]);
181		break;
182	}
183	return (pid);
184
185	/*
186	 * error cleanup and return
187	 */
188error3:
189	(void)close(pdfrom[0]);
190	(void)close(pdfrom[1]);
191error2:
192	(void)close(pdto[0]);
193	(void)close(pdto[1]);
194error1:
195	return (-1);
196}
197
198static char *
199basename(char *path)
200{
201	char *p;
202
203	p = strrchr(path, '/');
204	if (p == NULL) {
205		return (path);
206	} else {
207		return (p + 1);
208	}
209}
210
211#else /* YP */
212
213#define	ERR_ACCESS	1
214#define	ERR_MALLOC	2
215#define	ERR_READ	3
216#define	ERR_WRITE	4
217#define	ERR_DBASE	5
218#define	ERR_KEY		6
219
220static int match(char *, char *);
221
222/*
223 * Determine if requester is allowed to update the given map,
224 * and update it if so. Returns the status, which is zero
225 * if there is no access violation. This function updates
226 * the local file and then shuts up.
227 */
228int
229localupdate(char *name, char *filename, u_int op, u_int keylen __unused,
230    char *key, u_int datalen __unused, char *data)
231{
232	char line[256];
233	FILE *rf;
234	FILE *wf;
235	char *tmpname;
236	int err;
237
238	/*
239	 * Check permission
240	 */
241	if (strcmp(name, key) != 0) {
242		return (ERR_ACCESS);
243	}
244	if (strcmp(name, "nobody") == 0) {
245		/*
246		 * Can't change "nobody"s key.
247		 */
248		return (ERR_ACCESS);
249	}
250
251	/*
252	 * Open files
253	 */
254	tmpname = malloc(strlen(filename) + 4);
255	if (tmpname == NULL) {
256		return (ERR_MALLOC);
257	}
258	sprintf(tmpname, "%s.tmp", filename);
259	rf = fopen(filename, "r");
260	if (rf == NULL) {
261		err = ERR_READ;
262		goto cleanup;
263	}
264	wf = fopen(tmpname, "w");
265	if (wf == NULL) {
266		fclose(rf);
267		err = ERR_WRITE;
268		goto cleanup;
269	}
270	err = -1;
271	while (fgets(line, sizeof (line), rf)) {
272		if (err < 0 && match(line, name)) {
273			switch (op) {
274			case YPOP_INSERT:
275				err = ERR_KEY;
276				break;
277			case YPOP_STORE:
278			case YPOP_CHANGE:
279				fprintf(wf, "%s %s\n", key, data);
280				err = 0;
281				break;
282			case YPOP_DELETE:
283				/* do nothing */
284				err = 0;
285				break;
286			}
287		} else {
288			fputs(line, wf);
289		}
290	}
291	if (err < 0) {
292		switch (op) {
293		case YPOP_CHANGE:
294		case YPOP_DELETE:
295			err = ERR_KEY;
296			break;
297		case YPOP_INSERT:
298		case YPOP_STORE:
299			err = 0;
300			fprintf(wf, "%s %s\n", key, data);
301			break;
302		}
303	}
304	fclose(wf);
305	fclose(rf);
306	if (err == 0) {
307		if (rename(tmpname, filename) < 0) {
308			err = ERR_DBASE;
309			goto cleanup;
310		}
311	} else {
312		if (unlink(tmpname) < 0) {
313			err = ERR_DBASE;
314			goto cleanup;
315		}
316	}
317
318cleanup:
319	free(tmpname);
320	return (err);
321}
322
323static int
324match(char *line, char *name)
325{
326	int len;
327
328	len = strlen(name);
329	return (strncmp(line, name, len) == 0 &&
330		(line[len] == ' ' || line[len] == '\t'));
331}
332#endif /* !YP */
333