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
59uid_t real_uid, eff_uid;
60#endif
61
62extern char *__progname;
63
64static int smblib_initialized;
65
66struct rcfile *smb_rc;
67
68int
69smb_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 */
102void
103smb_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
138char *
139smb_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 */
158int
159smb_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
179void *
180smb_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
212char *
213smb_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		sprintf(dst, "%02x", ch);
236		dst += 2;
237	}
238	*dst = 0;
239	return dp;
240}
241
242int
243smb_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 (isascii(ch))
266		    ch = (isupper(ch) ? ('A' + (ch - 'A' + 13) % 26) :
267			  islower(ch) ? ('a' + (ch - 'a' + 13) % 26) : ch);
268		*dst++ = ch;
269	}
270	*dst = 0;
271	return 0;
272}
273
274
275#ifdef APPLE
276static int
277safe_execv(char *args[])
278{
279	int	     pid;
280	union wait      status;
281
282	pid = fork();
283	if (pid == 0) {
284		(void)execv(args[0], args);
285		errx(EX_OSERR, "%s: execv %s failed, %s\n", __progname,
286		     args[0], strerror(errno));
287	}
288	if (pid == -1) {
289		fprintf(stderr, "%s: fork failed, %s\n", __progname,
290			strerror(errno));
291		return (1);
292	}
293	if (wait4(pid, (int *)&status, 0, NULL) != pid) {
294		fprintf(stderr, "%s: BUG executing %s command\n", __progname,
295			args[0]);
296		return (1);
297	} else if (!WIFEXITED(status)) {
298		fprintf(stderr, "%s: %s command aborted by signal %d\n",
299			__progname, args[0], WTERMSIG(status));
300		return (1);
301	} else if (WEXITSTATUS(status)) {
302		fprintf(stderr, "%s: %s command failed, exit status %d: %s\n",
303			__progname, args[0], WEXITSTATUS(status),
304			strerror(WEXITSTATUS(status)));
305		return (1);
306	}
307	return (0);
308}
309
310
311void
312dropsuid()
313{
314	/* drop setuid root privs asap */
315	eff_uid = geteuid();
316	real_uid = getuid();
317	seteuid(real_uid);
318	return;
319}
320
321
322static int
323kextisloaded(char * kextname)
324{
325	mach_port_t kernel_port;
326	kmod_info_t *k, *loaded_modules = 0;
327	int err, loaded_count = 0;
328
329	/* on error return not loaded - to make loadsmbvfs fail */
330
331	err = task_for_pid(mach_task_self(), 0, &kernel_port);
332	if (err) {
333		fprintf(stderr, "%s: %s: %s\n", __progname,
334			"unable to get kernel task port",
335			mach_error_string(err));
336		return (0);
337	}
338	err = kmod_get_info(kernel_port, (void *)&loaded_modules,
339			    &loaded_count); /* never freed */
340	if (err) {
341		fprintf(stderr, "%s: %s: %s\n", __progname,
342			"kmod_get_info() failed",
343			mach_error_string(err));
344		return (0);
345	}
346	for (k = loaded_modules; k; k = k->next ? k+1 : 0)
347		if (!strcmp(k->name, kextname))
348			return (1);
349	return (0);
350}
351
352
353#define KEXTLOAD_COMMAND	"/sbin/kextload"
354#define FS_KEXT_DIR		"/System/Library/Extensions/smbfs.kext"
355#define FULL_KEXTNAME		"com.apple.filesystems.smbfs"
356
357
358int
359loadsmbvfs()
360{
361	const char *kextargs[] = {KEXTLOAD_COMMAND, FS_KEXT_DIR, NULL};
362	int error = 0;
363
364	/*
365	 * temporarily revert to root (required for kextload)
366	 */
367	seteuid(eff_uid);
368	if (!kextisloaded(FULL_KEXTNAME)) {
369		error = safe_execv(kextargs);
370		if (!error)
371			error = !kextisloaded(FULL_KEXTNAME);
372	}
373	seteuid(real_uid); /* and back to real user */
374	return (error);
375}
376#endif /* APPLE */
377