1 /*
2 * Copyright (c) 2000, Boris Popov
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Boris Popov.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * $Id: subr.c,v 1.12 2001/08/22 03:31:37 bp Exp $
33 */
34
35 #include <sys/param.h>
36 #include <sys/types.h>
37 #include <sys/errno.h>
38 #include <sys/sysctl.h>
39 #include <sys/syscall.h>
40 #include <unistd.h>
41 #include <ctype.h>
42 #include <string.h>
43 #include <stdio.h>
44 #include <stdlib.h>
45 #include <stdarg.h>
46 #include <err.h>
47
48 #include <netsmb/netbios.h>
49 #include <netsmb/smb_lib.h>
50 #include <netsmb/nb_lib.h>
51 #include <cflib.h>
52
53 #ifdef APPLE
54 #include <sysexits.h>
55 #include <sys/wait.h>
56 #include <mach/mach.h>
57 #include <mach/mach_error.h>
58
59 uid_t real_uid, eff_uid;
60 #endif
61
62 extern char *__progname;
63
64 static int smblib_initialized;
65
66 struct rcfile *smb_rc;
67
68 int
smb_lib_init(void)69 smb_lib_init(void)
70 {
71 int error;
72 int kv;
73 size_t kvlen = sizeof(kv);
74
75 if (smblib_initialized)
76 return 0;
77 error = sysctlbyname("net.smb.version", &kv, &kvlen, NULL, 0);
78 if (error) {
79 warnx("%s: can't find kernel module\n", __FUNCTION__);
80 return error;
81 }
82 if (NSMB_VERSION != kv) {
83 warnx("%s: kernel module version(%d) don't match library(%d).\n", __FUNCTION__, kv, NSMB_VERSION);
84 return EINVAL;
85 }
86 if ((error = nls_setlocale("")) != 0) {
87 warnx("%s: can't initialise locale\n", __FUNCTION__);
88 return error;
89 }
90 smblib_initialized++;
91 return 0;
92 }
93
94 /*
95 * Print a (descriptive) error message
96 * error values:
97 * 0 - no specific error code available;
98 * 1..32767 - system error
99 */
100 void
smb_error(const char * fmt,int error,...)101 smb_error(const char *fmt, int error,...) {
102 va_list ap;
103 const char *cp;
104 int errtype = error & SMB_ERRTYPE_MASK;
105
106 fprintf(stderr, "%s: ", __progname);
107 va_start(ap, error);
108 vfprintf(stderr, fmt, ap);
109 va_end(ap);
110 if (error == -1)
111 error = errno;
112 else
113 error &= ~SMB_ERRTYPE_MASK;
114 switch (errtype) {
115 case SMB_SYS_ERROR:
116 if (error)
117 fprintf(stderr, ": syserr = %s\n", strerror(error));
118 else
119 fprintf(stderr, "\n");
120 break;
121 case SMB_RAP_ERROR:
122 fprintf(stderr, ": raperr = %d (0x%04x)\n", error, error);
123 break;
124 case SMB_NB_ERROR:
125 cp = nb_strerror(error);
126 if (cp == NULL)
127 fprintf(stderr, ": nberr = unknown (0x%04x)\n", error);
128 else
129 fprintf(stderr, ": nberr = %s\n", cp);
130 break;
131 default:
132 fprintf(stderr, "\n");
133 }
134 }
135
136 char *
smb_printb(char * dest,int flags,const struct smb_bitname * bnp)137 smb_printb(char *dest, int flags, const struct smb_bitname *bnp) {
138 int first = 1;
139
140 strcpy(dest, "<");
141 for(; bnp->bn_bit; bnp++) {
142 if (flags & bnp->bn_bit) {
143 strcat(dest, bnp->bn_name);
144 first = 0;
145 }
146 if (!first && (flags & bnp[1].bn_bit))
147 strcat(dest, "|");
148 }
149 strcat(dest, ">");
150 return dest;
151 }
152
153 /*
154 * first read ~/.smbrc, next try to merge SMB_CFG_FILE
155 */
156 int
smb_open_rcfile(void)157 smb_open_rcfile(void)
158 {
159 char *home, *fn;
160 int error;
161
162 home = getenv("HOME");
163 if (home) {
164 fn = malloc(strlen(home) + 20);
165 sprintf(fn, "%s/.nsmbrc", home);
166 error = rc_open(fn, "r", &smb_rc);
167 free(fn);
168 }
169 error = rc_merge(SMB_CFG_FILE, &smb_rc);
170 if (smb_rc == NULL) {
171 printf("Warning: no cfg file(s) found.\n");
172 return ENOENT;
173 }
174 return 0;
175 }
176
177 void *
smb_dumptree(void)178 smb_dumptree(void)
179 {
180 size_t len;
181 void *p;
182 int error;
183
184 #ifdef APPLE
185 seteuid(eff_uid); /* restore setuid root briefly */
186 #endif
187 error = sysctlbyname("net.smb.treedump", NULL, &len, NULL, 0);
188 #ifdef APPLE
189 seteuid(real_uid); /* and back to real user */
190 #endif
191 if (error)
192 return NULL;
193 p = malloc(len);
194 if (p == NULL)
195 return NULL;
196 #ifdef APPLE
197 seteuid(eff_uid); /* restore setuid root briefly */
198 #endif
199 error = sysctlbyname("net.smb.treedump", p, &len, NULL, 0);
200 #ifdef APPLE
201 seteuid(real_uid); /* and back to real user */
202 #endif
203 if (error) {
204 free(p);
205 return NULL;
206 }
207 return p;
208 }
209
210 char *
smb_simplecrypt(char * dst,const char * src)211 smb_simplecrypt(char *dst, const char *src)
212 {
213 int ch, pos;
214 char *dp;
215
216 if (dst == NULL) {
217 dst = malloc(4 + 2 * strlen(src));
218 if (dst == NULL)
219 return NULL;
220 }
221 dp = dst;
222 *dst++ = '$';
223 *dst++ = '$';
224 *dst++ = '1';
225 pos = 27;
226 while (*src) {
227 ch = *src++;
228 if (isascii(ch))
229 ch = (isupper(ch) ? ('A' + (ch - 'A' + 13) % 26) :
230 islower(ch) ? ('a' + (ch - 'a' + 13) % 26) : ch);
231 ch ^= pos;
232 pos += 13;
233 if (pos > 256)
234 pos -= 256;
235 sprintf(dst, "%02x", ch);
236 dst += 2;
237 }
238 *dst = 0;
239 return dp;
240 }
241
242 int
smb_simpledecrypt(char * dst,const char * src)243 smb_simpledecrypt(char *dst, const char *src)
244 {
245 char *ep, hexval[3];
246 int len, ch, pos;
247
248 if (strncmp(src, "$$1", 3) != 0)
249 return EINVAL;
250 src += 3;
251 len = strlen(src);
252 if (len & 1)
253 return EINVAL;
254 len /= 2;
255 hexval[2] = 0;
256 pos = 27;
257 while (len--) {
258 hexval[0] = *src++;
259 hexval[1] = *src++;
260 ch = strtoul(hexval, &ep, 16);
261 if (*ep != 0)
262 return EINVAL;
263 ch ^= pos;
264 pos += 13;
265 if (pos > 256)
266 pos -= 256;
267 if (isascii(ch))
268 ch = (isupper(ch) ? ('A' + (ch - 'A' + 13) % 26) :
269 islower(ch) ? ('a' + (ch - 'a' + 13) % 26) : ch);
270 *dst++ = ch;
271 }
272 *dst = 0;
273 return 0;
274 }
275
276
277 #ifdef APPLE
278 static int
safe_execv(char * args[])279 safe_execv(char *args[])
280 {
281 int pid;
282 union wait status;
283
284 pid = fork();
285 if (pid == 0) {
286 (void)execv(args[0], args);
287 errx(EX_OSERR, "%s: execv %s failed, %s\n", __progname,
288 args[0], strerror(errno));
289 }
290 if (pid == -1) {
291 fprintf(stderr, "%s: fork failed, %s\n", __progname,
292 strerror(errno));
293 return (1);
294 }
295 if (wait4(pid, (int *)&status, 0, NULL) != pid) {
296 fprintf(stderr, "%s: BUG executing %s command\n", __progname,
297 args[0]);
298 return (1);
299 } else if (!WIFEXITED(status)) {
300 fprintf(stderr, "%s: %s command aborted by signal %d\n",
301 __progname, args[0], WTERMSIG(status));
302 return (1);
303 } else if (WEXITSTATUS(status)) {
304 fprintf(stderr, "%s: %s command failed, exit status %d: %s\n",
305 __progname, args[0], WEXITSTATUS(status),
306 strerror(WEXITSTATUS(status)));
307 return (1);
308 }
309 return (0);
310 }
311
312
313 void
dropsuid()314 dropsuid()
315 {
316 /* drop setuid root privs asap */
317 eff_uid = geteuid();
318 real_uid = getuid();
319 seteuid(real_uid);
320 return;
321 }
322
323
324 static int
kextisloaded(char * kextname)325 kextisloaded(char * kextname)
326 {
327 mach_port_t kernel_port;
328 kmod_info_t *k, *loaded_modules = 0;
329 int err, loaded_count = 0;
330
331 /* on error return not loaded - to make loadsmbvfs fail */
332
333 err = task_for_pid(mach_task_self(), 0, &kernel_port);
334 if (err) {
335 fprintf(stderr, "%s: %s: %s\n", __progname,
336 "unable to get kernel task port",
337 mach_error_string(err));
338 return (0);
339 }
340 err = kmod_get_info(kernel_port, (void *)&loaded_modules,
341 &loaded_count); /* never freed */
342 if (err) {
343 fprintf(stderr, "%s: %s: %s\n", __progname,
344 "kmod_get_info() failed",
345 mach_error_string(err));
346 return (0);
347 }
348 for (k = loaded_modules; k; k = k->next ? k+1 : 0)
349 if (!strcmp(k->name, kextname))
350 return (1);
351 return (0);
352 }
353
354
355 #define KEXTLOAD_COMMAND "/sbin/kextload"
356 #define FS_KEXT_DIR "/System/Library/Extensions/smbfs.kext"
357 #define FULL_KEXTNAME "com.apple.filesystems.smbfs"
358
359
360 int
loadsmbvfs()361 loadsmbvfs()
362 {
363 const char *kextargs[] = {KEXTLOAD_COMMAND, FS_KEXT_DIR, NULL};
364 int error = 0;
365
366 /*
367 * temporarily revert to root (required for kextload)
368 */
369 seteuid(eff_uid);
370 if (!kextisloaded(FULL_KEXTNAME)) {
371 error = safe_execv(kextargs);
372 if (!error)
373 error = !kextisloaded(FULL_KEXTNAME);
374 }
375 seteuid(real_uid); /* and back to real user */
376 return (error);
377 }
378 #endif /* APPLE */
379