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 #if __FreeBSD_version > 400000
78 error = sysctlbyname("net.smb.version", &kv, &kvlen, NULL, 0);
79 if (error) {
80 warnx("%s: can't find kernel module\n", __FUNCTION__);
81 return error;
82 }
83 if (NSMB_VERSION != kv) {
84 warnx("%s: kernel module version(%d) don't match library(%d).\n", __FUNCTION__, kv, NSMB_VERSION);
85 return EINVAL;
86 }
87 #endif
88 if ((error = nls_setlocale("")) != 0) {
89 warnx("%s: can't initialise locale\n", __FUNCTION__);
90 return error;
91 }
92 smblib_initialized++;
93 return 0;
94 }
95
96 /*
97 * Print a (descriptive) error message
98 * error values:
99 * 0 - no specific error code available;
100 * 1..32767 - system error
101 */
102 void
smb_error(const char * fmt,int error,...)103 smb_error(const char *fmt, int error,...) {
104 va_list ap;
105 const char *cp;
106 int errtype = error & SMB_ERRTYPE_MASK;
107
108 fprintf(stderr, "%s: ", __progname);
109 va_start(ap, error);
110 vfprintf(stderr, fmt, ap);
111 va_end(ap);
112 if (error == -1)
113 error = errno;
114 else
115 error &= ~SMB_ERRTYPE_MASK;
116 switch (errtype) {
117 case SMB_SYS_ERROR:
118 if (error)
119 fprintf(stderr, ": syserr = %s\n", strerror(error));
120 else
121 fprintf(stderr, "\n");
122 break;
123 case SMB_RAP_ERROR:
124 fprintf(stderr, ": raperr = %d (0x%04x)\n", error, error);
125 break;
126 case SMB_NB_ERROR:
127 cp = nb_strerror(error);
128 if (cp == NULL)
129 fprintf(stderr, ": nberr = unknown (0x%04x)\n", error);
130 else
131 fprintf(stderr, ": nberr = %s\n", cp);
132 break;
133 default:
134 fprintf(stderr, "\n");
135 }
136 }
137
138 char *
smb_printb(char * dest,int flags,const struct smb_bitname * bnp)139 smb_printb(char *dest, int flags, const struct smb_bitname *bnp) {
140 int first = 1;
141
142 strcpy(dest, "<");
143 for(; bnp->bn_bit; bnp++) {
144 if (flags & bnp->bn_bit) {
145 strcat(dest, bnp->bn_name);
146 first = 0;
147 }
148 if (!first && (flags & bnp[1].bn_bit))
149 strcat(dest, "|");
150 }
151 strcat(dest, ">");
152 return dest;
153 }
154
155 /*
156 * first read ~/.smbrc, next try to merge SMB_CFG_FILE
157 */
158 int
smb_open_rcfile(void)159 smb_open_rcfile(void)
160 {
161 char *home, *fn;
162 int error;
163
164 home = getenv("HOME");
165 if (home) {
166 fn = malloc(strlen(home) + 20);
167 sprintf(fn, "%s/.nsmbrc", home);
168 error = rc_open(fn, "r", &smb_rc);
169 free(fn);
170 }
171 error = rc_merge(SMB_CFG_FILE, &smb_rc);
172 if (smb_rc == NULL) {
173 printf("Warning: no cfg file(s) found.\n");
174 return ENOENT;
175 }
176 return 0;
177 }
178
179 void *
smb_dumptree(void)180 smb_dumptree(void)
181 {
182 size_t len;
183 void *p;
184 int error;
185
186 #ifdef APPLE
187 seteuid(eff_uid); /* restore setuid root briefly */
188 #endif
189 error = sysctlbyname("net.smb.treedump", NULL, &len, NULL, 0);
190 #ifdef APPLE
191 seteuid(real_uid); /* and back to real user */
192 #endif
193 if (error)
194 return NULL;
195 p = malloc(len);
196 if (p == NULL)
197 return NULL;
198 #ifdef APPLE
199 seteuid(eff_uid); /* restore setuid root briefly */
200 #endif
201 error = sysctlbyname("net.smb.treedump", p, &len, NULL, 0);
202 #ifdef APPLE
203 seteuid(real_uid); /* and back to real user */
204 #endif
205 if (error) {
206 free(p);
207 return NULL;
208 }
209 return p;
210 }
211
212 char *
smb_simplecrypt(char * dst,const char * src)213 smb_simplecrypt(char *dst, const char *src)
214 {
215 int ch, pos;
216 char *dp;
217
218 if (dst == NULL) {
219 dst = malloc(4 + 2 * strlen(src));
220 if (dst == NULL)
221 return NULL;
222 }
223 dp = dst;
224 *dst++ = '$';
225 *dst++ = '$';
226 *dst++ = '1';
227 pos = 27;
228 while (*src) {
229 ch = *src++;
230 if (isascii(ch))
231 ch = (isupper(ch) ? ('A' + (ch - 'A' + 13) % 26) :
232 islower(ch) ? ('a' + (ch - 'a' + 13) % 26) : ch);
233 ch ^= pos;
234 pos += 13;
235 if (pos > 256)
236 pos -= 256;
237 sprintf(dst, "%02x", ch);
238 dst += 2;
239 }
240 *dst = 0;
241 return dp;
242 }
243
244 int
smb_simpledecrypt(char * dst,const char * src)245 smb_simpledecrypt(char *dst, const char *src)
246 {
247 char *ep, hexval[3];
248 int len, ch, pos;
249
250 if (strncmp(src, "$$1", 3) != 0)
251 return EINVAL;
252 src += 3;
253 len = strlen(src);
254 if (len & 1)
255 return EINVAL;
256 len /= 2;
257 hexval[2] = 0;
258 pos = 27;
259 while (len--) {
260 hexval[0] = *src++;
261 hexval[1] = *src++;
262 ch = strtoul(hexval, &ep, 16);
263 if (*ep != 0)
264 return EINVAL;
265 ch ^= pos;
266 pos += 13;
267 if (pos > 256)
268 pos -= 256;
269 if (isascii(ch))
270 ch = (isupper(ch) ? ('A' + (ch - 'A' + 13) % 26) :
271 islower(ch) ? ('a' + (ch - 'a' + 13) % 26) : ch);
272 *dst++ = ch;
273 }
274 *dst = 0;
275 return 0;
276 }
277
278
279 #ifdef APPLE
280 static int
safe_execv(char * args[])281 safe_execv(char *args[])
282 {
283 int pid;
284 union wait status;
285
286 pid = fork();
287 if (pid == 0) {
288 (void)execv(args[0], args);
289 errx(EX_OSERR, "%s: execv %s failed, %s\n", __progname,
290 args[0], strerror(errno));
291 }
292 if (pid == -1) {
293 fprintf(stderr, "%s: fork failed, %s\n", __progname,
294 strerror(errno));
295 return (1);
296 }
297 if (wait4(pid, (int *)&status, 0, NULL) != pid) {
298 fprintf(stderr, "%s: BUG executing %s command\n", __progname,
299 args[0]);
300 return (1);
301 } else if (!WIFEXITED(status)) {
302 fprintf(stderr, "%s: %s command aborted by signal %d\n",
303 __progname, args[0], WTERMSIG(status));
304 return (1);
305 } else if (WEXITSTATUS(status)) {
306 fprintf(stderr, "%s: %s command failed, exit status %d: %s\n",
307 __progname, args[0], WEXITSTATUS(status),
308 strerror(WEXITSTATUS(status)));
309 return (1);
310 }
311 return (0);
312 }
313
314
315 void
dropsuid()316 dropsuid()
317 {
318 /* drop setuid root privs asap */
319 eff_uid = geteuid();
320 real_uid = getuid();
321 seteuid(real_uid);
322 return;
323 }
324
325
326 static int
kextisloaded(char * kextname)327 kextisloaded(char * kextname)
328 {
329 mach_port_t kernel_port;
330 kmod_info_t *k, *loaded_modules = 0;
331 int err, loaded_count = 0;
332
333 /* on error return not loaded - to make loadsmbvfs fail */
334
335 err = task_for_pid(mach_task_self(), 0, &kernel_port);
336 if (err) {
337 fprintf(stderr, "%s: %s: %s\n", __progname,
338 "unable to get kernel task port",
339 mach_error_string(err));
340 return (0);
341 }
342 err = kmod_get_info(kernel_port, (void *)&loaded_modules,
343 &loaded_count); /* never freed */
344 if (err) {
345 fprintf(stderr, "%s: %s: %s\n", __progname,
346 "kmod_get_info() failed",
347 mach_error_string(err));
348 return (0);
349 }
350 for (k = loaded_modules; k; k = k->next ? k+1 : 0)
351 if (!strcmp(k->name, kextname))
352 return (1);
353 return (0);
354 }
355
356
357 #define KEXTLOAD_COMMAND "/sbin/kextload"
358 #define FS_KEXT_DIR "/System/Library/Extensions/smbfs.kext"
359 #define FULL_KEXTNAME "com.apple.filesystems.smbfs"
360
361
362 int
loadsmbvfs()363 loadsmbvfs()
364 {
365 const char *kextargs[] = {KEXTLOAD_COMMAND, FS_KEXT_DIR, NULL};
366 int error = 0;
367
368 /*
369 * temporarily revert to root (required for kextload)
370 */
371 seteuid(eff_uid);
372 if (!kextisloaded(FULL_KEXTNAME)) {
373 error = safe_execv(kextargs);
374 if (!error)
375 error = !kextisloaded(FULL_KEXTNAME);
376 }
377 seteuid(real_uid); /* and back to real user */
378 return (error);
379 }
380 #endif /* APPLE */
381