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