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