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
33 static char sccsid[] = "@(#)update.c 1.2 91/03/11 Copyr 1986 Sun Micro";
34 #endif
35 #endif
36
37 /*
38 * Copyright (C) 1986, 1989, Sun Microsystems, Inc.
39 */
40
41 /*
42 * Administrative tool to add a new user to the publickey database
43 */
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD$");
46
47 #include <sys/types.h>
48 #include <sys/time.h>
49 #include <sys/resource.h>
50
51 #include <rpc/rpc.h>
52 #include <rpc/key_prot.h>
53
54 #ifdef YP
55 #include <sys/wait.h>
56 #include <rpcsvc/yp_prot.h>
57 #include <rpcsvc/ypclnt.h>
58 #include <netdb.h>
59 #endif /* YP */
60
61 #include <pwd.h>
62 #include <stdio.h>
63 #include <stdlib.h>
64 #include <string.h>
65 #include <unistd.h>
66
67 #include "extern.h"
68
69 #ifdef YP
70 static char SHELL[] = "/bin/sh";
71 static char YPDBPATH[]="/var/yp"; /* This is defined but not used! */
72 static char UPDATEFILE[] = "updaters";
73
74 static int _openchild(char *, FILE **, FILE **);
75 static char *basename(char *path);
76
77 /*
78 * Determine if requester is allowed to update the given map,
79 * and update it if so. Returns the yp status, which is zero
80 * if there is no access violation.
81 */
82 int
mapupdate(char * requester,char * mapname,u_int op,u_int keylen,char * key,u_int datalen,char * data)83 mapupdate(char *requester, char *mapname, u_int op, u_int keylen,
84 char *key, u_int datalen, char *data)
85 {
86 char updater[MAXMAPNAMELEN + 40];
87 FILE *childargs;
88 FILE *childrslt;
89 #ifdef WEXITSTATUS
90 int status;
91 #else
92 union wait status;
93 #endif
94 pid_t pid;
95 u_int yperrno;
96
97
98 #ifdef DEBUG
99 printf("%s %s\n", key, data);
100 #endif
101 (void)sprintf(updater, "make -s -f %s/%s %s", YPDBPATH, /* !!! */
102 UPDATEFILE, mapname);
103 pid = _openchild(updater, &childargs, &childrslt);
104 if (pid < 0) {
105 return (YPERR_YPERR);
106 }
107
108 /*
109 * Write to child
110 */
111 (void)fprintf(childargs, "%s\n", requester);
112 (void)fprintf(childargs, "%u\n", op);
113 (void)fprintf(childargs, "%u\n", keylen);
114 (void)fwrite(key, (int)keylen, 1, childargs);
115 (void)fprintf(childargs, "\n");
116 (void)fprintf(childargs, "%u\n", datalen);
117 (void)fwrite(data, (int)datalen, 1, childargs);
118 (void)fprintf(childargs, "\n");
119 (void)fclose(childargs);
120
121 /*
122 * Read from child
123 */
124 (void)fscanf(childrslt, "%d", &yperrno);
125 (void)fclose(childrslt);
126
127 (void)wait(&status);
128 #ifdef WEXITSTATUS
129 if (WEXITSTATUS(status) != 0) {
130 #else
131 if (status.w_retcode != 0) {
132 #endif
133 return (YPERR_YPERR);
134 }
135 return (yperrno);
136 }
137
138 /*
139 * returns pid, or -1 for failure
140 */
141 static pid_t
142 _openchild(char *command, FILE **fto, FILE **ffrom)
143 {
144 int i;
145 pid_t pid;
146 int pdto[2];
147 int pdfrom[2];
148 char *com;
149 struct rlimit rl;
150
151 if (pipe(pdto) < 0) {
152 goto error1;
153 }
154 if (pipe(pdfrom) < 0) {
155 goto error2;
156 }
157 switch (pid = fork()) {
158 case -1:
159 goto error3;
160
161 case 0:
162 /*
163 * child: read from pdto[0], write into pdfrom[1]
164 */
165 (void)close(0);
166 (void)dup(pdto[0]);
167 (void)close(1);
168 (void)dup(pdfrom[1]);
169 getrlimit(RLIMIT_NOFILE, &rl);
170 for (i = rl.rlim_max - 1; i >= 3; i--) {
171 (void) close(i);
172 }
173 com = malloc((unsigned) strlen(command) + 6);
174 if (com == NULL) {
175 _exit(~0);
176 }
177 (void)sprintf(com, "exec %s", command);
178 execl(SHELL, basename(SHELL), "-c", com, (char *)NULL);
179 _exit(~0);
180
181 default:
182 /*
183 * parent: write into pdto[1], read from pdfrom[0]
184 */
185 *fto = fdopen(pdto[1], "w");
186 (void)close(pdto[0]);
187 *ffrom = fdopen(pdfrom[0], "r");
188 (void)close(pdfrom[1]);
189 break;
190 }
191 return (pid);
192
193 /*
194 * error cleanup and return
195 */
196 error3:
197 (void)close(pdfrom[0]);
198 (void)close(pdfrom[1]);
199 error2:
200 (void)close(pdto[0]);
201 (void)close(pdto[1]);
202 error1:
203 return (-1);
204 }
205
206 static char *
207 basename(char *path)
208 {
209 char *p;
210
211 p = strrchr(path, '/');
212 if (p == NULL) {
213 return (path);
214 } else {
215 return (p + 1);
216 }
217 }
218
219 #else /* YP */
220
221 #define ERR_ACCESS 1
222 #define ERR_MALLOC 2
223 #define ERR_READ 3
224 #define ERR_WRITE 4
225 #define ERR_DBASE 5
226 #define ERR_KEY 6
227
228 static int match(char *, char *);
229
230 /*
231 * Determine if requester is allowed to update the given map,
232 * and update it if so. Returns the status, which is zero
233 * if there is no access violation. This function updates
234 * the local file and then shuts up.
235 */
236 int
237 localupdate(char *name, char *filename, u_int op, u_int keylen __unused,
238 char *key, u_int datalen __unused, char *data)
239 {
240 char line[256];
241 FILE *rf;
242 FILE *wf;
243 char *tmpname;
244 int err;
245
246 /*
247 * Check permission
248 */
249 if (strcmp(name, key) != 0) {
250 return (ERR_ACCESS);
251 }
252 if (strcmp(name, "nobody") == 0) {
253 /*
254 * Can't change "nobody"s key.
255 */
256 return (ERR_ACCESS);
257 }
258
259 /*
260 * Open files
261 */
262 tmpname = malloc(strlen(filename) + 4);
263 if (tmpname == NULL) {
264 return (ERR_MALLOC);
265 }
266 sprintf(tmpname, "%s.tmp", filename);
267 rf = fopen(filename, "r");
268 if (rf == NULL) {
269 err = ERR_READ;
270 goto cleanup;
271 }
272 wf = fopen(tmpname, "w");
273 if (wf == NULL) {
274 fclose(rf);
275 err = ERR_WRITE;
276 goto cleanup;
277 }
278 err = -1;
279 while (fgets(line, sizeof (line), rf)) {
280 if (err < 0 && match(line, name)) {
281 switch (op) {
282 case YPOP_INSERT:
283 err = ERR_KEY;
284 break;
285 case YPOP_STORE:
286 case YPOP_CHANGE:
287 fprintf(wf, "%s %s\n", key, data);
288 err = 0;
289 break;
290 case YPOP_DELETE:
291 /* do nothing */
292 err = 0;
293 break;
294 }
295 } else {
296 fputs(line, wf);
297 }
298 }
299 if (err < 0) {
300 switch (op) {
301 case YPOP_CHANGE:
302 case YPOP_DELETE:
303 err = ERR_KEY;
304 break;
305 case YPOP_INSERT:
306 case YPOP_STORE:
307 err = 0;
308 fprintf(wf, "%s %s\n", key, data);
309 break;
310 }
311 }
312 fclose(wf);
313 fclose(rf);
314 if (err == 0) {
315 if (rename(tmpname, filename) < 0) {
316 err = ERR_DBASE;
317 goto cleanup;
318 }
319 } else {
320 if (unlink(tmpname) < 0) {
321 err = ERR_DBASE;
322 goto cleanup;
323 }
324 }
325
326 cleanup:
327 free(tmpname);
328 return (err);
329 }
330
331 static int
332 match(char *line, char *name)
333 {
334 int len;
335
336 len = strlen(name);
337 return (strncmp(line, name, len) == 0 &&
338 (line[len] == ' ' || line[len] == '\t'));
339 }
340 #endif /* !YP */
341