summaryrefslogtreecommitdiff
path: root/source3/client/mount.cifs.c
blob: 7ab17a2b0284845fb8968098f7122732a10921b3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
#define _GNU_SOURCE

#include <stdlib.h>
#include <unistd.h>
#include <pwd.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <getopt.h>
#include <errno.h>
#include <netdb.h>
#include <string.h>
#include <mntent.h>

#define MOUNT_CIFS_VERSION "1"

extern char *getusername(void);

char * thisprogram;
int verboseflag = 0;
static int got_password = 0;
static int got_user = 0;
static int got_domain = 0;
static int got_ip = 0;
static int got_unc = 0;
static int got_uid = 0;
static int got_gid = 0;
static char * user_name = NULL;
char * mountpassword = NULL;


/* BB finish BB

        cifs_umount
        open nofollow - avoid symlink exposure? 
        get owner of dir see if matches self or if root
        call system(umount argv) etc.
                
BB end finish BB */

void mount_cifs_usage()
{
	printf("\nUsage:  %s remotetarget dir\n", thisprogram);
	printf("\nMount the remotetarget, specified as either a UNC name or ");
	printf(" CIFS URL, to the local directory, dir.\n");

	exit(1);
}

/* caller frees username if necessary */
char * getusername() {
	char *username = NULL;
	struct passwd *password = getpwuid(getuid());

	if (password) {
		username = password->pw_name;
	}
	return username;
}

char * parse_cifs_url(unc_name)
{
	printf("\ncifs url %s\n",unc_name);
}

int parse_options(char * options)
{
	char * data;
	char * value = 0;

	if (!options)
		return 1;

	while ((data = strsep(&options, ",")) != NULL) {
		if (!*data)
			continue;
		if ((value = strchr(data, '=')) != NULL) {
			*value++ = '\0';
		}
		if (strncmp(data, "user", 4) == 0) {
			if (!value || !*value) {
				printf("invalid or missing username\n");
				return 1;	/* needs_arg; */
			}
			if (strnlen(value, 260) < 260) {
				got_user=1;
				/* BB add check for format user%pass */
				/* if(strchr(username%passw) got_password = 1) */
			} else {
				printf("username too long\n");
				return 1;
			}
	} else if (strncmp(data, "pass", 4) == 0) {
		if (!value || !*value) {
			if(got_password) {
				printf("password specified twice, ignoring second\n");
			} else
				got_password = 1;
		} else if (strnlen(value, 17) < 17) {
			got_password = 1;
		} else {
			printf("password too long\n");
			return 1;
		}
	} else if (strncmp(data, "ip", 2) == 0) {
		if (!value || !*value) {
			printf("target ip address argument missing");
		} else if (strnlen(value, 35) < 35) {
			got_ip = 1;
		} else {
			printf("ip address too long\n");
			return 1;
		}
	} else if ((strncmp(data, "unc", 3) == 0)
		   || (strncmp(data, "target", 6) == 0)
		   || (strncmp(data, "path", 4) == 0)) {
		if (!value || !*value) {
			printf("invalid path to network resource\n");
			return 1;  /* needs_arg; */
		} else if(strnlen(value,5) < 5) {
			printf("UNC name too short");
		}

		if (strnlen(value, 300) < 300) {
			got_unc = 1;
			if (strncmp(value, "//", 2) == 0) {
				if(got_unc)
					printf("unc name specified twice, ignoring second\n");
				else
					got_unc = 1;
			} else if (strncmp(value, "\\\\", 2) != 0) {	                   
				printf("UNC Path does not begin with // or \\\\ \n");
				return 1;
			} else {
				if(got_unc)
					printf("unc name specified twice, ignoring second\n");
				else
					got_unc = 1;
			}
		} else {
			printf("CIFS: UNC name too long\n");
			return 1;
		}
	} else if ((strncmp(data, "domain", 3) == 0)
		   || (strncmp(data, "workgroup", 5) == 0)) {
		if (!value || !*value) {
			printf("CIFS: invalid domain name\n");
			return 1;	/* needs_arg; */
		}
		if (strnlen(value, 65) < 65) {
			got_domain = 1;
		} else {
			printf("domain name too long\n");
			return 1;
		}
	} else if (strncmp(data, "uid", 3) == 0) {
		if (value && *value) {
			got_uid = 1;
		}
	} else if (strncmp(data, "gid", 3) == 0) {
		if (value && *value) {
			got_gid = 1;
		}
       /* fmask and dmask synonyms for people used to smbfs syntax */
	} else if (strcmp(data, "file_mode") == 0 || strcmp(data, "fmask")==0) {
		if (!value || !*value) {
			printf ("Option '%s' requires a numerical argument\n", data);
			return 1;
		}

		if (value[0] != '0') {
			printf ("WARNING: '%s' not expressed in octal.\n", data);
		}

		if (strcmp (data, "fmask") == 0) {
			printf ("WARNING: CIFS mount option 'fmask' is deprecated. Use 'file_mode' instead.\n");
			data = "file_mode";
                }
        } else if (strcmp(data, "dir_mode") == 0 || strcmp(data, "dmask")==0) {
                if (!value || !*value) {
                        printf ("Option '%s' requires a numerical argument\n", data);
                        return 1;
                }

                if (value[0] != '0') {
                        printf ("WARNING: '%s' not expressed in octal.\n", data);
                }

                if (strcmp (data, "dmask") == 0) {
                        printf ("WARNING: CIFS mount option 'dmask' is deprecated. Use 'dir_mode' instead.\n");
                        data = "dir_mode";
                }
	} /* else if (strnicmp(data, "port", 4) == 0) {
		if (value && *value) {
			vol->port =
				simple_strtoul(value, &value, 0);
		}
	} else if (strnicmp(data, "rsize", 5) == 0) {
		if (value && *value) {
			vol->rsize =
				simple_strtoul(value, &value, 0);
		}
	} else if (strnicmp(data, "wsize", 5) == 0) {
		if (value && *value) {
			vol->wsize =
				simple_strtoul(value, &value, 0);
		}
	} else if (strnicmp(data, "version", 3) == 0) {
		
	} else if (strnicmp(data, "rw", 2) == 0) {
		
	} else
		printf("CIFS: Unknown mount option %s\n",data); */
	}
	return 0;
}

/* Note that caller frees the returned buffer if necessary */
char * parse_server(char * unc_name)
{
	int length = strnlen(unc_name,1024);
	char * share;
	char * ipaddress_string = NULL;
	struct hostent * host_entry;
	struct in_addr server_ipaddr;
	int rc,j;
	char temp[64];

	if(length > 1023) {
		printf("mount error: UNC name too long");
		return 0;
	}
	if (strncasecmp("cifs://",unc_name,7) == 0)
		return parse_cifs_url(unc_name+7);
	if (strncasecmp("smb://",unc_name,6) == 0) {
		return parse_cifs_url(unc_name+6);
	}

	if(length < 3) {
		/* BB add code to find DFS root here */
		printf("\nMounting the DFS root for domain not implemented yet");
		return 0;
	} else {
		/* BB add support for \\\\ not just // */
		if(strncmp(unc_name,"//",2) && strncmp(unc_name,"\\\\",2)) {
			printf("mount error: improperly formatted UNC name.");
			printf(" %s does not begin with \\\\ or //\n",unc_name);
			return 0;
		} else {
			unc_name[0] = '\\';
			unc_name[0] = '/';
			unc_name[1] = '/';
			unc_name += 2;
			if ((share = strchr(unc_name, '/')) || 
				(share = strchr(unc_name,'\\'))) {
				*share = 0;  /* temporarily terminate the string */
				share += 1;
				host_entry = gethostbyname(unc_name);
				*(share - 1) = '/'; /* put the slash back */
/*				rc = getipnodebyname(unc_name, AF_INET, AT_ADDRCONFIG ,&rc);*/
				if(host_entry == NULL) {
					printf("mount error: could not find target server. TCP name %s not found ", unc_name);
					printf(" rc = %d\n",rc);
					return 0;
				}
				else {
					/* BB should we pass an alternate version of the share name as Unicode */
					/* BB what about ipv6? BB */
					/* BB add retries with alternate servers in list */

					memcpy(&server_ipaddr.s_addr, host_entry->h_addr, 4);

					ipaddress_string = inet_ntoa(server_ipaddr);                                                                                     
					if(ipaddress_string == NULL) {
						printf("mount error: could not get valid ip address for target server\n");
						return 0;
					}
					return ipaddress_string; 
				}
			} else {
				/* BB add code to find DFS root (send null path on get DFS Referral to specified server here */
				printf("Mounting the DFS root for a particular server not implemented yet\n");
				return 0;
			}
		}
	}
}

static struct option longopts[] = {
	{ "all", 0, 0, 'a' },
	{ "help", 0, 0, 'h' },
	{ "read-only", 0, 0, 'r' },
	{ "ro", 0, 0, 'r' },
	{ "verbose", 0, 0, 'v' },
	{ "version", 0, 0, 'V' },
	{ "read-write", 0, 0, 'w' },
	{ "rw", 0, 0, 'w' },
	{ "options", 1, 0, 'o' },
	{ "types", 1, 0, 't' },
	{ "replace", 0, 0, 129 },
	{ "after", 0, 0, 130 },
	{ "before", 0, 0, 131 },
	{ "over", 0, 0, 132 },
	{ "move", 0, 0, 133 },
	{ "rsize",1, 0, 136 },
	{ "wsize",1, 0, 137 },
	{ "uid", 1, 0, 138},
	{ "gid", 1, 0, 139},
	{ "uuid",1,0,'U' },
	{ "user",1,0,140},
	{ "username",1,0,140},
	{ "dom",1,0,141},
	{ "domain",1,0,141},
	{ "password",1,0,142},
	{ NULL, 0, 0, 0 }
};

int main(int argc, char ** argv)
{
	int c;
	int flags = MS_MANDLOCK | MS_MGC_VAL;
	char * orgoptions = NULL;
	char * share_name = NULL;
	char * domain_name = NULL;
	char * ipaddr = NULL;
	char * uuid = NULL;
	char * mountpoint;
	char * options;
	char * temp;
	int rc,i;
	int rsize = 0;
	int wsize = 0;
	int nomtab = 0;
	int uid = 0;
	int gid = 0;
	int optlen = 0;
	struct stat statbuf;
	struct utsname sysinfo;
	struct mntent mountent;
	FILE * pmntfile;

	/* setlocale(LC_ALL, "");
	bindtextdomain(PACKAGE, LOCALEDIR);
	textdomain(PACKAGE); */

	if(argc && argv) {
		thisprogram = argv[0];
	}
	if(thisprogram == NULL)
		thisprogram = "mount.cifs";

	uname(&sysinfo);
	/* BB add workstation name and domain and pass down */
/*#ifdef _GNU_SOURCE
	printf(" node: %s machine: %s\n", sysinfo.nodename,sysinfo.machine);
#endif*/
	if(argc < 3)
		mount_cifs_usage();
	share_name = argv[1];
	mountpoint = argv[2];
	/* add sharename in opts string as unc= parm */

	while ((c = getopt_long (argc, argv, "afFhilL:no:O:rsU:vVwt:",
			 longopts, NULL)) != -1) {
		switch (c) {
/*	case 'a':	       
		++mount_all;
		break;
	case 'f':	       
		++fake;
		break;
	case 'F':
		++optfork;
		break; */
		case 'h':	 /* help */
			mount_cifs_usage ();
			break;
/*	case 'i':
		external_allowed = 0;
		break;
	case 'l':
		list_with_volumelabel = 1;
		break;
	case 'L':
		volumelabel = optarg;
		break; */
	case 'n':
		++nomtab;
		break;
	case 'o':
		if (orgoptions) {
			orgoptions = strcat(orgoptions, ",");
			orgoptions = strcat(orgoptions,optarg);
		} else
			orgoptions = strdup(optarg);
		break;

/*	case 'O':
		if (test_opts)
			test_opts = xstrconcat3(test_opts, ",", optarg);
		else
			test_opts = xstrdup(optarg);
		break;*/
		case 'r':  /* mount readonly */
			flags |= MS_RDONLY;
			break;
		case 'U':
			uuid = optarg;
			break;
		case 'v':
			++verboseflag;
			break;
/*	case 'V':	   
		printf ("mount: %s\n", version);
		exit (0);*/
		case 'w':
			flags &= ~MS_RDONLY;
			break;
/*	case 0:
		break;

	case 128: 
		mounttype = MS_BIND;
		break;
	case 129: 
		mounttype = MS_REPLACE;
		break;
	case 130: 
		mounttype = MS_AFTER;
		break;
	case 131: 
		mounttype = MS_BEFORE;
		break;
	case 132: 
		mounttype = MS_OVER;
		break;
	case 133: 
		mounttype = MS_MOVE;
		break;
	case 135:
		mounttype = (MS_BIND | MS_REC);
		break; */
		case 136:
			rsize = atoi(optarg) ;
			break;
		case 137:
			wsize = atoi(optarg);
			break;
		case 138:
			uid = atoi(optarg);
			break;
		case 139:
			gid = atoi(optarg);
			break;
		case 140:
			got_user = 1;
			user_name = optarg;
			break;
		case 141:
			domain_name = optarg;
			break;
		case 142:
			got_password = 1;
			 mountpassword = optarg;
			break;
		case '?':
		default:
			mount_cifs_usage ();
		}
	}

	/* canonicalize the path in argv[1]? */

	/* BB save off path and pop after mount returns */
	if(chdir(mountpoint)) {
		printf("mount error: can not change directory into mount target %s\n",mountpoint);
	}

	if(stat (mountpoint, &statbuf)) {
		printf("mount error: mount point %s does not exist\n",mountpoint);
		return -1;
	}

	if (S_ISDIR(statbuf.st_mode) == 0) {
		printf("mount error: mount point %s is not a directory\n",mountpoint);
		return -1;
	}

	if((getuid() != 0) && (geteuid() == 0)) {
		if((statbuf.st_uid == getuid()) && (S_IRWXU == statbuf.st_mode & S_IRWXU)) {
			printf("setuid mount allowed\n");
		} else {
			printf("mount error: permission denied, not superuser and cifs.mount not installed SUID\n"); 
			return -1;
		}
	}

	ipaddr = parse_server(share_name);
/*	if(share_name == NULL)
		return 1; */
	if (parse_options(strdup(orgoptions)))
		return 1;

	if(got_user == 0)
		user_name = getusername();
       
/*	check username for user%password format */

	if(got_password == 0) {
		if (getenv("PASSWD")) {
			mountpassword = malloc(33);
			if(mountpassword) {
				strncpy(mountpassword,getenv("PASSWD"),32);
				got_password = 1;
			}
/*		} else if (getenv("PASSWD_FD") || getenv("PASSWD_FILE")) {
			get_password_file();
			got_password = 1;*/ /* BB add missing function */
		} else {
			mountpassword = getpass("Password: "); /* BB obsolete */
			got_password = 1;
		}
	}
	/* FIXME launch daemon (handles dfs name resolution and credential change) 
	   remember to clear parms and overwrite password field before launching */
	if(orgoptions) {
		optlen = strlen(orgoptions);
	} else
		optlen = 0;
	if(share_name)
		optlen += strlen(share_name) + 4;
	if(user_name)
		optlen += strlen(user_name) + 6;
	if(ipaddr)
		optlen += strlen(ipaddr) + 4;
	if(mountpassword)
		optlen += strlen(mountpassword) + 6;
	options = malloc(optlen + 10);

	options[0] = 0;
	strncat(options,"unc=",4);
	strcat(options,share_name);
	/* scan backwards and reverse direction of slash */
	temp = strrchr(options, '/');
	if(temp > options + 6)
		*temp = '\\';
	if(ipaddr) {
		strncat(options,",ip=",4);
		strcat(options,ipaddr);
	} 
	if(user_name) {
		strncat(options,",user=",6);
		strcat(options,user_name);
	} 
	if(mountpassword) {
		strncat(options,",pass=",6);
		strcat(options,mountpassword);
	}
	strncat(options,",ver=",5);
	strcat(options,MOUNT_CIFS_VERSION);

	if(orgoptions) {
		strcat(options,",");
		strcat(options,orgoptions);
	}
	/* printf("\noptions %s \n",options);*/
	if(mount(share_name, mountpoint, "cifs", flags, options)) {
	/* remember to kill daemon on error */
		switch (errno) {
		case 0:
			printf("mount failed but no error number set\n");
			return 0;
		case ENODEV:
			printf("mount error: cifs filesystem not supported by the system\n");
			break;
		default:
			printf("mount error %d = %s\n",errno,strerror(errno));
		}
		printf("Refer to the mount.cifs(8) manual page (e.g.man mount.cifs)\n");
		return -1;
	} else {
		pmntfile = setmntent(MOUNTED, "a+");
		if(pmntfile) {
			mountent.mnt_fsname = share_name;
			mountent.mnt_dir = mountpoint; 
			mountent.mnt_type = "cifs"; 
			mountent.mnt_opts = "";
			mountent.mnt_freq = 0;
			mountent.mnt_passno = 0;
			rc = addmntent(pmntfile,&mountent);
			endmntent(pmntfile);
		} else {
		    printf("could not update mount table\n");
		}
	}
	return 0;
}