1/* 2 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation, version 2. 7 * 8 * Authors: 9 * Casey Schaufler <casey@schaufler-ca.com> 10 * Ahmed S. Darwish <darwish.07@gmail.com> 11 * 12 * Special thanks to the authors of selinuxfs. 13 * 14 * Karl MacMillan <kmacmillan@tresys.com> 15 * James Morris <jmorris@redhat.com> 16 * 17 */ 18 19#include <linux/kernel.h> 20#include <linux/vmalloc.h> 21#include <linux/security.h> 22#include <linux/mutex.h> 23#include <linux/slab.h> 24#include <net/net_namespace.h> 25#include <net/cipso_ipv4.h> 26#include <linux/seq_file.h> 27#include <linux/ctype.h> 28#include <linux/audit.h> 29#include <linux/magic.h> 30#include "smack.h" 31 32/* 33 * smackfs pseudo filesystem. 34 */ 35 36enum smk_inos { 37 SMK_ROOT_INO = 2, 38 SMK_LOAD = 3, /* load policy */ 39 SMK_CIPSO = 4, /* load label -> CIPSO mapping */ 40 SMK_DOI = 5, /* CIPSO DOI */ 41 SMK_DIRECT = 6, /* CIPSO level indicating direct label */ 42 SMK_AMBIENT = 7, /* internet ambient label */ 43 SMK_NETLBLADDR = 8, /* single label hosts */ 44 SMK_ONLYCAP = 9, /* the only "capable" label */ 45 SMK_LOGGING = 10, /* logging */ 46 SMK_LOAD_SELF = 11, /* task specific rules */ 47 SMK_ACCESSES = 12, /* access policy */ 48 SMK_MAPPED = 13, /* CIPSO level indicating mapped label */ 49 SMK_LOAD2 = 14, /* load policy with long labels */ 50 SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */ 51 SMK_ACCESS2 = 16, /* make an access check with long labels */ 52 SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */ 53 SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */ 54 SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */ 55 SMK_SYSLOG = 20, /* change syslog label) */ 56 SMK_PTRACE = 21, /* set ptrace rule */ 57#ifdef CONFIG_SECURITY_SMACK_BRINGUP 58 SMK_UNCONFINED = 22, /* define an unconfined label */ 59#endif 60}; 61 62/* 63 * List locks 64 */ 65static DEFINE_MUTEX(smack_cipso_lock); 66static DEFINE_MUTEX(smack_ambient_lock); 67static DEFINE_MUTEX(smk_netlbladdr_lock); 68 69/* 70 * This is the "ambient" label for network traffic. 71 * If it isn't somehow marked, use this. 72 * It can be reset via smackfs/ambient 73 */ 74struct smack_known *smack_net_ambient; 75 76/* 77 * This is the level in a CIPSO header that indicates a 78 * smack label is contained directly in the category set. 79 * It can be reset via smackfs/direct 80 */ 81int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT; 82 83/* 84 * This is the level in a CIPSO header that indicates a 85 * secid is contained directly in the category set. 86 * It can be reset via smackfs/mapped 87 */ 88int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT; 89 90/* 91 * Unless a process is running with this label even 92 * having CAP_MAC_OVERRIDE isn't enough to grant 93 * privilege to violate MAC policy. If no label is 94 * designated (the NULL case) capabilities apply to 95 * everyone. It is expected that the hat (^) label 96 * will be used if any label is used. 97 */ 98struct smack_known *smack_onlycap; 99 100#ifdef CONFIG_SECURITY_SMACK_BRINGUP 101/* 102 * Allow one label to be unconfined. This is for 103 * debugging and application bring-up purposes only. 104 * It is bad and wrong, but everyone seems to expect 105 * to have it. 106 */ 107struct smack_known *smack_unconfined; 108#endif 109 110/* 111 * If this value is set restrict syslog use to the label specified. 112 * It can be reset via smackfs/syslog 113 */ 114struct smack_known *smack_syslog_label; 115 116/* 117 * Ptrace current rule 118 * SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based) 119 * SMACK_PTRACE_EXACT labels must match, but can be overriden with 120 * CAP_SYS_PTRACE 121 * SMACK_PTRACE_DRACONIAN lables must match, CAP_SYS_PTRACE has no effect 122 */ 123int smack_ptrace_rule = SMACK_PTRACE_DEFAULT; 124 125/* 126 * Certain IP addresses may be designated as single label hosts. 127 * Packets are sent there unlabeled, but only from tasks that 128 * can write to the specified label. 129 */ 130 131LIST_HEAD(smk_netlbladdr_list); 132 133/* 134 * Rule lists are maintained for each label. 135 * This master list is just for reading /smack/load and /smack/load2. 136 */ 137struct smack_master_list { 138 struct list_head list; 139 struct smack_rule *smk_rule; 140}; 141 142LIST_HEAD(smack_rule_list); 143 144struct smack_parsed_rule { 145 struct smack_known *smk_subject; 146 struct smack_known *smk_object; 147 int smk_access1; 148 int smk_access2; 149}; 150 151static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; 152 153struct smack_known smack_cipso_option = { 154 .smk_known = SMACK_CIPSO_OPTION, 155 .smk_secid = 0, 156}; 157 158/* 159 * Values for parsing cipso rules 160 * SMK_DIGITLEN: Length of a digit field in a rule. 161 * SMK_CIPSOMIN: Minimum possible cipso rule length. 162 * SMK_CIPSOMAX: Maximum possible cipso rule length. 163 */ 164#define SMK_DIGITLEN 4 165#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) 166#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) 167 168/* 169 * Values for parsing MAC rules 170 * SMK_ACCESS: Maximum possible combination of access permissions 171 * SMK_ACCESSLEN: Maximum length for a rule access field 172 * SMK_LOADLEN: Smack rule length 173 */ 174#define SMK_OACCESS "rwxa" 175#define SMK_ACCESS "rwxatl" 176#define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1) 177#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) 178#define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN) 179#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) 180 181/* 182 * Stricly for CIPSO level manipulation. 183 * Set the category bit number in a smack label sized buffer. 184 */ 185static inline void smack_catset_bit(unsigned int cat, char *catsetp) 186{ 187 if (cat == 0 || cat > (SMK_CIPSOLEN * 8)) 188 return; 189 190 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8); 191} 192 193/** 194 * smk_netlabel_audit_set - fill a netlbl_audit struct 195 * @nap: structure to fill 196 */ 197static void smk_netlabel_audit_set(struct netlbl_audit *nap) 198{ 199 struct smack_known *skp = smk_of_current(); 200 201 nap->loginuid = audit_get_loginuid(current); 202 nap->sessionid = audit_get_sessionid(current); 203 nap->secid = skp->smk_secid; 204} 205 206/* 207 * Value for parsing single label host rules 208 * "1.2.3.4 X" 209 */ 210#define SMK_NETLBLADDRMIN 9 211 212/** 213 * smk_set_access - add a rule to the rule list or replace an old rule 214 * @srp: the rule to add or replace 215 * @rule_list: the list of rules 216 * @rule_lock: the rule list lock 217 * @global: if non-zero, indicates a global rule 218 * 219 * Looks through the current subject/object/access list for 220 * the subject/object pair and replaces the access that was 221 * there. If the pair isn't found add it with the specified 222 * access. 223 * 224 * Returns 0 if nothing goes wrong or -ENOMEM if it fails 225 * during the allocation of the new pair to add. 226 */ 227static int smk_set_access(struct smack_parsed_rule *srp, 228 struct list_head *rule_list, 229 struct mutex *rule_lock, int global) 230{ 231 struct smack_rule *sp; 232 struct smack_master_list *smlp; 233 int found = 0; 234 int rc = 0; 235 236 mutex_lock(rule_lock); 237 238 /* 239 * Because the object label is less likely to match 240 * than the subject label check it first 241 */ 242 list_for_each_entry_rcu(sp, rule_list, list) { 243 if (sp->smk_object == srp->smk_object && 244 sp->smk_subject == srp->smk_subject) { 245 found = 1; 246 sp->smk_access |= srp->smk_access1; 247 sp->smk_access &= ~srp->smk_access2; 248 break; 249 } 250 } 251 252 if (found == 0) { 253 sp = kzalloc(sizeof(*sp), GFP_KERNEL); 254 if (sp == NULL) { 255 rc = -ENOMEM; 256 goto out; 257 } 258 259 sp->smk_subject = srp->smk_subject; 260 sp->smk_object = srp->smk_object; 261 sp->smk_access = srp->smk_access1 & ~srp->smk_access2; 262 263 list_add_rcu(&sp->list, rule_list); 264 /* 265 * If this is a global as opposed to self and a new rule 266 * it needs to get added for reporting. 267 */ 268 if (global) { 269 smlp = kzalloc(sizeof(*smlp), GFP_KERNEL); 270 if (smlp != NULL) { 271 smlp->smk_rule = sp; 272 list_add_rcu(&smlp->list, &smack_rule_list); 273 } else 274 rc = -ENOMEM; 275 } 276 } 277 278out: 279 mutex_unlock(rule_lock); 280 return rc; 281} 282 283/** 284 * smk_perm_from_str - parse smack accesses from a text string 285 * @string: a text string that contains a Smack accesses code 286 * 287 * Returns an integer with respective bits set for specified accesses. 288 */ 289static int smk_perm_from_str(const char *string) 290{ 291 int perm = 0; 292 const char *cp; 293 294 for (cp = string; ; cp++) 295 switch (*cp) { 296 case '-': 297 break; 298 case 'r': 299 case 'R': 300 perm |= MAY_READ; 301 break; 302 case 'w': 303 case 'W': 304 perm |= MAY_WRITE; 305 break; 306 case 'x': 307 case 'X': 308 perm |= MAY_EXEC; 309 break; 310 case 'a': 311 case 'A': 312 perm |= MAY_APPEND; 313 break; 314 case 't': 315 case 'T': 316 perm |= MAY_TRANSMUTE; 317 break; 318 case 'l': 319 case 'L': 320 perm |= MAY_LOCK; 321 break; 322 case 'b': 323 case 'B': 324 perm |= MAY_BRINGUP; 325 break; 326 default: 327 return perm; 328 } 329} 330 331/** 332 * smk_fill_rule - Fill Smack rule from strings 333 * @subject: subject label string 334 * @object: object label string 335 * @access1: access string 336 * @access2: string with permissions to be removed 337 * @rule: Smack rule 338 * @import: if non-zero, import labels 339 * @len: label length limit 340 * 341 * Returns 0 on success, -EINVAL on failure and -ENOENT when either subject 342 * or object is missing. 343 */ 344static int smk_fill_rule(const char *subject, const char *object, 345 const char *access1, const char *access2, 346 struct smack_parsed_rule *rule, int import, 347 int len) 348{ 349 const char *cp; 350 struct smack_known *skp; 351 352 if (import) { 353 rule->smk_subject = smk_import_entry(subject, len); 354 if (rule->smk_subject == NULL) 355 return -EINVAL; 356 357 rule->smk_object = smk_import_entry(object, len); 358 if (rule->smk_object == NULL) 359 return -EINVAL; 360 } else { 361 cp = smk_parse_smack(subject, len); 362 if (cp == NULL) 363 return -EINVAL; 364 skp = smk_find_entry(cp); 365 kfree(cp); 366 if (skp == NULL) 367 return -ENOENT; 368 rule->smk_subject = skp; 369 370 cp = smk_parse_smack(object, len); 371 if (cp == NULL) 372 return -EINVAL; 373 skp = smk_find_entry(cp); 374 kfree(cp); 375 if (skp == NULL) 376 return -ENOENT; 377 rule->smk_object = skp; 378 } 379 380 rule->smk_access1 = smk_perm_from_str(access1); 381 if (access2) 382 rule->smk_access2 = smk_perm_from_str(access2); 383 else 384 rule->smk_access2 = ~rule->smk_access1; 385 386 return 0; 387} 388 389/** 390 * smk_parse_rule - parse Smack rule from load string 391 * @data: string to be parsed whose size is SMK_LOADLEN 392 * @rule: Smack rule 393 * @import: if non-zero, import labels 394 * 395 * Returns 0 on success, -1 on errors. 396 */ 397static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule, 398 int import) 399{ 400 int rc; 401 402 rc = smk_fill_rule(data, data + SMK_LABELLEN, 403 data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule, 404 import, SMK_LABELLEN); 405 return rc; 406} 407 408/** 409 * smk_parse_long_rule - parse Smack rule from rule string 410 * @data: string to be parsed, null terminated 411 * @rule: Will be filled with Smack parsed rule 412 * @import: if non-zero, import labels 413 * @tokens: numer of substrings expected in data 414 * 415 * Returns number of processed bytes on success, -1 on failure. 416 */ 417static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule, 418 int import, int tokens) 419{ 420 ssize_t cnt = 0; 421 char *tok[4]; 422 int rc; 423 int i; 424 425 /* 426 * Parsing the rule in-place, filling all white-spaces with '\0' 427 */ 428 for (i = 0; i < tokens; ++i) { 429 while (isspace(data[cnt])) 430 data[cnt++] = '\0'; 431 432 if (data[cnt] == '\0') 433 /* Unexpected end of data */ 434 return -1; 435 436 tok[i] = data + cnt; 437 438 while (data[cnt] && !isspace(data[cnt])) 439 ++cnt; 440 } 441 while (isspace(data[cnt])) 442 data[cnt++] = '\0'; 443 444 while (i < 4) 445 tok[i++] = NULL; 446 447 rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0); 448 return rc == 0 ? cnt : rc; 449} 450 451#define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */ 452#define SMK_LONG_FMT 1 /* Variable long label format */ 453#define SMK_CHANGE_FMT 2 /* Rule modification format */ 454/** 455 * smk_write_rules_list - write() for any /smack rule file 456 * @file: file pointer, not actually used 457 * @buf: where to get the data from 458 * @count: bytes sent 459 * @ppos: where to start - must be 0 460 * @rule_list: the list of rules to write to 461 * @rule_lock: lock for the rule list 462 * @format: /smack/load or /smack/load2 or /smack/change-rule format. 463 * 464 * Get one smack access rule from above. 465 * The format for SMK_LONG_FMT is: 466 * "subject<whitespace>object<whitespace>access[<whitespace>...]" 467 * The format for SMK_FIXED24_FMT is exactly: 468 * "subject object rwxat" 469 * The format for SMK_CHANGE_FMT is: 470 * "subject<whitespace>object<whitespace> 471 * acc_enable<whitespace>acc_disable[<whitespace>...]" 472 */ 473static ssize_t smk_write_rules_list(struct file *file, const char __user *buf, 474 size_t count, loff_t *ppos, 475 struct list_head *rule_list, 476 struct mutex *rule_lock, int format) 477{ 478 struct smack_parsed_rule rule; 479 char *data; 480 int rc; 481 int trunc = 0; 482 int tokens; 483 ssize_t cnt = 0; 484 485 /* 486 * No partial writes. 487 * Enough data must be present. 488 */ 489 if (*ppos != 0) 490 return -EINVAL; 491 492 if (format == SMK_FIXED24_FMT) { 493 /* 494 * Minor hack for backward compatibility 495 */ 496 if (count < SMK_OLOADLEN || count > SMK_LOADLEN) 497 return -EINVAL; 498 } else { 499 if (count >= PAGE_SIZE) { 500 count = PAGE_SIZE - 1; 501 trunc = 1; 502 } 503 } 504 505 data = kmalloc(count + 1, GFP_KERNEL); 506 if (data == NULL) 507 return -ENOMEM; 508 509 if (copy_from_user(data, buf, count) != 0) { 510 rc = -EFAULT; 511 goto out; 512 } 513 514 /* 515 * In case of parsing only part of user buf, 516 * avoid having partial rule at the data buffer 517 */ 518 if (trunc) { 519 while (count > 0 && (data[count - 1] != '\n')) 520 --count; 521 if (count == 0) { 522 rc = -EINVAL; 523 goto out; 524 } 525 } 526 527 data[count] = '\0'; 528 tokens = (format == SMK_CHANGE_FMT ? 4 : 3); 529 while (cnt < count) { 530 if (format == SMK_FIXED24_FMT) { 531 rc = smk_parse_rule(data, &rule, 1); 532 if (rc != 0) { 533 rc = -EINVAL; 534 goto out; 535 } 536 cnt = count; 537 } else { 538 rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens); 539 if (rc <= 0) { 540 rc = -EINVAL; 541 goto out; 542 } 543 cnt += rc; 544 } 545 546 if (rule_list == NULL) 547 rc = smk_set_access(&rule, &rule.smk_subject->smk_rules, 548 &rule.smk_subject->smk_rules_lock, 1); 549 else 550 rc = smk_set_access(&rule, rule_list, rule_lock, 0); 551 552 if (rc) 553 goto out; 554 } 555 556 rc = cnt; 557out: 558 kfree(data); 559 return rc; 560} 561 562/* 563 * Core logic for smackfs seq list operations. 564 */ 565 566static void *smk_seq_start(struct seq_file *s, loff_t *pos, 567 struct list_head *head) 568{ 569 struct list_head *list; 570 571 /* 572 * This is 0 the first time through. 573 */ 574 if (s->index == 0) 575 s->private = head; 576 577 if (s->private == NULL) 578 return NULL; 579 580 list = s->private; 581 if (list_empty(list)) 582 return NULL; 583 584 if (s->index == 0) 585 return list->next; 586 return list; 587} 588 589static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos, 590 struct list_head *head) 591{ 592 struct list_head *list = v; 593 594 if (list_is_last(list, head)) { 595 s->private = NULL; 596 return NULL; 597 } 598 s->private = list->next; 599 return list->next; 600} 601 602static void smk_seq_stop(struct seq_file *s, void *v) 603{ 604 /* No-op */ 605} 606 607static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max) 608{ 609 /* 610 * Don't show any rules with label names too long for 611 * interface file (/smack/load or /smack/load2) 612 * because you should expect to be able to write 613 * anything you read back. 614 */ 615 if (strlen(srp->smk_subject->smk_known) >= max || 616 strlen(srp->smk_object->smk_known) >= max) 617 return; 618 619 if (srp->smk_access == 0) 620 return; 621 622 seq_printf(s, "%s %s", 623 srp->smk_subject->smk_known, 624 srp->smk_object->smk_known); 625 626 seq_putc(s, ' '); 627 628 if (srp->smk_access & MAY_READ) 629 seq_putc(s, 'r'); 630 if (srp->smk_access & MAY_WRITE) 631 seq_putc(s, 'w'); 632 if (srp->smk_access & MAY_EXEC) 633 seq_putc(s, 'x'); 634 if (srp->smk_access & MAY_APPEND) 635 seq_putc(s, 'a'); 636 if (srp->smk_access & MAY_TRANSMUTE) 637 seq_putc(s, 't'); 638 if (srp->smk_access & MAY_LOCK) 639 seq_putc(s, 'l'); 640 if (srp->smk_access & MAY_BRINGUP) 641 seq_putc(s, 'b'); 642 643 seq_putc(s, '\n'); 644} 645 646/* 647 * Seq_file read operations for /smack/load 648 */ 649 650static void *load2_seq_start(struct seq_file *s, loff_t *pos) 651{ 652 return smk_seq_start(s, pos, &smack_rule_list); 653} 654 655static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos) 656{ 657 return smk_seq_next(s, v, pos, &smack_rule_list); 658} 659 660static int load_seq_show(struct seq_file *s, void *v) 661{ 662 struct list_head *list = v; 663 struct smack_master_list *smlp = 664 list_entry(list, struct smack_master_list, list); 665 666 smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN); 667 668 return 0; 669} 670 671static const struct seq_operations load_seq_ops = { 672 .start = load2_seq_start, 673 .next = load2_seq_next, 674 .show = load_seq_show, 675 .stop = smk_seq_stop, 676}; 677 678/** 679 * smk_open_load - open() for /smack/load 680 * @inode: inode structure representing file 681 * @file: "load" file pointer 682 * 683 * For reading, use load_seq_* seq_file reading operations. 684 */ 685static int smk_open_load(struct inode *inode, struct file *file) 686{ 687 return seq_open(file, &load_seq_ops); 688} 689 690/** 691 * smk_write_load - write() for /smack/load 692 * @file: file pointer, not actually used 693 * @buf: where to get the data from 694 * @count: bytes sent 695 * @ppos: where to start - must be 0 696 * 697 */ 698static ssize_t smk_write_load(struct file *file, const char __user *buf, 699 size_t count, loff_t *ppos) 700{ 701 /* 702 * Must have privilege. 703 * No partial writes. 704 * Enough data must be present. 705 */ 706 if (!smack_privileged(CAP_MAC_ADMIN)) 707 return -EPERM; 708 709 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, 710 SMK_FIXED24_FMT); 711} 712 713static const struct file_operations smk_load_ops = { 714 .open = smk_open_load, 715 .read = seq_read, 716 .llseek = seq_lseek, 717 .write = smk_write_load, 718 .release = seq_release, 719}; 720 721/** 722 * smk_cipso_doi - initialize the CIPSO domain 723 */ 724static void smk_cipso_doi(void) 725{ 726 int rc; 727 struct cipso_v4_doi *doip; 728 struct netlbl_audit nai; 729 730 smk_netlabel_audit_set(&nai); 731 732 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai); 733 if (rc != 0) 734 printk(KERN_WARNING "%s:%d remove rc = %d\n", 735 __func__, __LINE__, rc); 736 737 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); 738 if (doip == NULL) 739 panic("smack: Failed to initialize cipso DOI.\n"); 740 doip->map.std = NULL; 741 doip->doi = smk_cipso_doi_value; 742 doip->type = CIPSO_V4_MAP_PASS; 743 doip->tags[0] = CIPSO_V4_TAG_RBITMAP; 744 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) 745 doip->tags[rc] = CIPSO_V4_TAG_INVALID; 746 747 rc = netlbl_cfg_cipsov4_add(doip, &nai); 748 if (rc != 0) { 749 printk(KERN_WARNING "%s:%d cipso add rc = %d\n", 750 __func__, __LINE__, rc); 751 kfree(doip); 752 return; 753 } 754 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai); 755 if (rc != 0) { 756 printk(KERN_WARNING "%s:%d map add rc = %d\n", 757 __func__, __LINE__, rc); 758 kfree(doip); 759 return; 760 } 761} 762 763/** 764 * smk_unlbl_ambient - initialize the unlabeled domain 765 * @oldambient: previous domain string 766 */ 767static void smk_unlbl_ambient(char *oldambient) 768{ 769 int rc; 770 struct netlbl_audit nai; 771 772 smk_netlabel_audit_set(&nai); 773 774 if (oldambient != NULL) { 775 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai); 776 if (rc != 0) 777 printk(KERN_WARNING "%s:%d remove rc = %d\n", 778 __func__, __LINE__, rc); 779 } 780 if (smack_net_ambient == NULL) 781 smack_net_ambient = &smack_known_floor; 782 783 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET, 784 NULL, NULL, &nai); 785 if (rc != 0) 786 printk(KERN_WARNING "%s:%d add rc = %d\n", 787 __func__, __LINE__, rc); 788} 789 790/* 791 * Seq_file read operations for /smack/cipso 792 */ 793 794static void *cipso_seq_start(struct seq_file *s, loff_t *pos) 795{ 796 return smk_seq_start(s, pos, &smack_known_list); 797} 798 799static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) 800{ 801 return smk_seq_next(s, v, pos, &smack_known_list); 802} 803 804/* 805 * Print cipso labels in format: 806 * label level[/cat[,cat]] 807 */ 808static int cipso_seq_show(struct seq_file *s, void *v) 809{ 810 struct list_head *list = v; 811 struct smack_known *skp = 812 list_entry(list, struct smack_known, list); 813 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat; 814 char sep = '/'; 815 int i; 816 817 /* 818 * Don't show a label that could not have been set using 819 * /smack/cipso. This is in support of the notion that 820 * anything read from /smack/cipso ought to be writeable 821 * to /smack/cipso. 822 * 823 * /smack/cipso2 should be used instead. 824 */ 825 if (strlen(skp->smk_known) >= SMK_LABELLEN) 826 return 0; 827 828 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); 829 830 for (i = netlbl_catmap_walk(cmp, 0); i >= 0; 831 i = netlbl_catmap_walk(cmp, i + 1)) { 832 seq_printf(s, "%c%d", sep, i); 833 sep = ','; 834 } 835 836 seq_putc(s, '\n'); 837 838 return 0; 839} 840 841static const struct seq_operations cipso_seq_ops = { 842 .start = cipso_seq_start, 843 .next = cipso_seq_next, 844 .show = cipso_seq_show, 845 .stop = smk_seq_stop, 846}; 847 848/** 849 * smk_open_cipso - open() for /smack/cipso 850 * @inode: inode structure representing file 851 * @file: "cipso" file pointer 852 * 853 * Connect our cipso_seq_* operations with /smack/cipso 854 * file_operations 855 */ 856static int smk_open_cipso(struct inode *inode, struct file *file) 857{ 858 return seq_open(file, &cipso_seq_ops); 859} 860 861/** 862 * smk_set_cipso - do the work for write() for cipso and cipso2 863 * @file: file pointer, not actually used 864 * @buf: where to get the data from 865 * @count: bytes sent 866 * @ppos: where to start 867 * @format: /smack/cipso or /smack/cipso2 868 * 869 * Accepts only one cipso rule per write call. 870 * Returns number of bytes written or error code, as appropriate 871 */ 872static ssize_t smk_set_cipso(struct file *file, const char __user *buf, 873 size_t count, loff_t *ppos, int format) 874{ 875 struct smack_known *skp; 876 struct netlbl_lsm_secattr ncats; 877 char mapcatset[SMK_CIPSOLEN]; 878 int maplevel; 879 unsigned int cat; 880 int catlen; 881 ssize_t rc = -EINVAL; 882 char *data = NULL; 883 char *rule; 884 int ret; 885 int i; 886 887 /* 888 * Must have privilege. 889 * No partial writes. 890 * Enough data must be present. 891 */ 892 if (!smack_privileged(CAP_MAC_ADMIN)) 893 return -EPERM; 894 if (*ppos != 0) 895 return -EINVAL; 896 if (format == SMK_FIXED24_FMT && 897 (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)) 898 return -EINVAL; 899 900 data = kzalloc(count + 1, GFP_KERNEL); 901 if (data == NULL) 902 return -ENOMEM; 903 904 if (copy_from_user(data, buf, count) != 0) { 905 rc = -EFAULT; 906 goto unlockedout; 907 } 908 909 data[count] = '\0'; 910 rule = data; 911 /* 912 * Only allow one writer at a time. Writes should be 913 * quite rare and small in any case. 914 */ 915 mutex_lock(&smack_cipso_lock); 916 917 skp = smk_import_entry(rule, 0); 918 if (skp == NULL) 919 goto out; 920 921 if (format == SMK_FIXED24_FMT) 922 rule += SMK_LABELLEN; 923 else 924 rule += strlen(skp->smk_known) + 1; 925 926 ret = sscanf(rule, "%d", &maplevel); 927 if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) 928 goto out; 929 930 rule += SMK_DIGITLEN; 931 ret = sscanf(rule, "%d", &catlen); 932 if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) 933 goto out; 934 935 if (format == SMK_FIXED24_FMT && 936 count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) 937 goto out; 938 939 memset(mapcatset, 0, sizeof(mapcatset)); 940 941 for (i = 0; i < catlen; i++) { 942 rule += SMK_DIGITLEN; 943 ret = sscanf(rule, "%u", &cat); 944 if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM) 945 goto out; 946 947 smack_catset_bit(cat, mapcatset); 948 } 949 950 rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN); 951 if (rc >= 0) { 952 netlbl_catmap_free(skp->smk_netlabel.attr.mls.cat); 953 skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat; 954 skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl; 955 rc = count; 956 } 957 958out: 959 mutex_unlock(&smack_cipso_lock); 960unlockedout: 961 kfree(data); 962 return rc; 963} 964 965/** 966 * smk_write_cipso - write() for /smack/cipso 967 * @file: file pointer, not actually used 968 * @buf: where to get the data from 969 * @count: bytes sent 970 * @ppos: where to start 971 * 972 * Accepts only one cipso rule per write call. 973 * Returns number of bytes written or error code, as appropriate 974 */ 975static ssize_t smk_write_cipso(struct file *file, const char __user *buf, 976 size_t count, loff_t *ppos) 977{ 978 return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT); 979} 980 981static const struct file_operations smk_cipso_ops = { 982 .open = smk_open_cipso, 983 .read = seq_read, 984 .llseek = seq_lseek, 985 .write = smk_write_cipso, 986 .release = seq_release, 987}; 988 989/* 990 * Seq_file read operations for /smack/cipso2 991 */ 992 993/* 994 * Print cipso labels in format: 995 * label level[/cat[,cat]] 996 */ 997static int cipso2_seq_show(struct seq_file *s, void *v) 998{ 999 struct list_head *list = v; 1000 struct smack_known *skp = 1001 list_entry(list, struct smack_known, list); 1002 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat; 1003 char sep = '/'; 1004 int i; 1005 1006 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); 1007 1008 for (i = netlbl_catmap_walk(cmp, 0); i >= 0; 1009 i = netlbl_catmap_walk(cmp, i + 1)) { 1010 seq_printf(s, "%c%d", sep, i); 1011 sep = ','; 1012 } 1013 1014 seq_putc(s, '\n'); 1015 1016 return 0; 1017} 1018 1019static const struct seq_operations cipso2_seq_ops = { 1020 .start = cipso_seq_start, 1021 .next = cipso_seq_next, 1022 .show = cipso2_seq_show, 1023 .stop = smk_seq_stop, 1024}; 1025 1026/** 1027 * smk_open_cipso2 - open() for /smack/cipso2 1028 * @inode: inode structure representing file 1029 * @file: "cipso2" file pointer 1030 * 1031 * Connect our cipso_seq_* operations with /smack/cipso2 1032 * file_operations 1033 */ 1034static int smk_open_cipso2(struct inode *inode, struct file *file) 1035{ 1036 return seq_open(file, &cipso2_seq_ops); 1037} 1038 1039/** 1040 * smk_write_cipso2 - write() for /smack/cipso2 1041 * @file: file pointer, not actually used 1042 * @buf: where to get the data from 1043 * @count: bytes sent 1044 * @ppos: where to start 1045 * 1046 * Accepts only one cipso rule per write call. 1047 * Returns number of bytes written or error code, as appropriate 1048 */ 1049static ssize_t smk_write_cipso2(struct file *file, const char __user *buf, 1050 size_t count, loff_t *ppos) 1051{ 1052 return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT); 1053} 1054 1055static const struct file_operations smk_cipso2_ops = { 1056 .open = smk_open_cipso2, 1057 .read = seq_read, 1058 .llseek = seq_lseek, 1059 .write = smk_write_cipso2, 1060 .release = seq_release, 1061}; 1062 1063/* 1064 * Seq_file read operations for /smack/netlabel 1065 */ 1066 1067static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos) 1068{ 1069 return smk_seq_start(s, pos, &smk_netlbladdr_list); 1070} 1071 1072static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos) 1073{ 1074 return smk_seq_next(s, v, pos, &smk_netlbladdr_list); 1075} 1076#define BEBITS (sizeof(__be32) * 8) 1077 1078/* 1079 * Print host/label pairs 1080 */ 1081static int netlbladdr_seq_show(struct seq_file *s, void *v) 1082{ 1083 struct list_head *list = v; 1084 struct smk_netlbladdr *skp = 1085 list_entry(list, struct smk_netlbladdr, list); 1086 unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr; 1087 int maskn; 1088 u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr); 1089 1090 for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++); 1091 1092 seq_printf(s, "%u.%u.%u.%u/%d %s\n", 1093 hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label->smk_known); 1094 1095 return 0; 1096} 1097 1098static const struct seq_operations netlbladdr_seq_ops = { 1099 .start = netlbladdr_seq_start, 1100 .next = netlbladdr_seq_next, 1101 .show = netlbladdr_seq_show, 1102 .stop = smk_seq_stop, 1103}; 1104 1105/** 1106 * smk_open_netlbladdr - open() for /smack/netlabel 1107 * @inode: inode structure representing file 1108 * @file: "netlabel" file pointer 1109 * 1110 * Connect our netlbladdr_seq_* operations with /smack/netlabel 1111 * file_operations 1112 */ 1113static int smk_open_netlbladdr(struct inode *inode, struct file *file) 1114{ 1115 return seq_open(file, &netlbladdr_seq_ops); 1116} 1117 1118/** 1119 * smk_netlbladdr_insert 1120 * @new : netlabel to insert 1121 * 1122 * This helper insert netlabel in the smack_netlbladdrs list 1123 * sorted by netmask length (longest to smallest) 1124 * locked by &smk_netlbladdr_lock in smk_write_netlbladdr 1125 * 1126 */ 1127static void smk_netlbladdr_insert(struct smk_netlbladdr *new) 1128{ 1129 struct smk_netlbladdr *m, *m_next; 1130 1131 if (list_empty(&smk_netlbladdr_list)) { 1132 list_add_rcu(&new->list, &smk_netlbladdr_list); 1133 return; 1134 } 1135 1136 m = list_entry_rcu(smk_netlbladdr_list.next, 1137 struct smk_netlbladdr, list); 1138 1139 /* the comparison '>' is a bit hacky, but works */ 1140 if (new->smk_mask.s_addr > m->smk_mask.s_addr) { 1141 list_add_rcu(&new->list, &smk_netlbladdr_list); 1142 return; 1143 } 1144 1145 list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) { 1146 if (list_is_last(&m->list, &smk_netlbladdr_list)) { 1147 list_add_rcu(&new->list, &m->list); 1148 return; 1149 } 1150 m_next = list_entry_rcu(m->list.next, 1151 struct smk_netlbladdr, list); 1152 if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) { 1153 list_add_rcu(&new->list, &m->list); 1154 return; 1155 } 1156 } 1157} 1158 1159 1160/** 1161 * smk_write_netlbladdr - write() for /smack/netlabel 1162 * @file: file pointer, not actually used 1163 * @buf: where to get the data from 1164 * @count: bytes sent 1165 * @ppos: where to start 1166 * 1167 * Accepts only one netlbladdr per write call. 1168 * Returns number of bytes written or error code, as appropriate 1169 */ 1170static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf, 1171 size_t count, loff_t *ppos) 1172{ 1173 struct smk_netlbladdr *snp; 1174 struct sockaddr_in newname; 1175 char *smack; 1176 struct smack_known *skp; 1177 char *data; 1178 char *host = (char *)&newname.sin_addr.s_addr; 1179 int rc; 1180 struct netlbl_audit audit_info; 1181 struct in_addr mask; 1182 unsigned int m; 1183 int found; 1184 u32 mask_bits = (1<<31); 1185 __be32 nsa; 1186 u32 temp_mask; 1187 1188 /* 1189 * Must have privilege. 1190 * No partial writes. 1191 * Enough data must be present. 1192 * "<addr/mask, as a.b.c.d/e><space><label>" 1193 * "<addr, as a.b.c.d><space><label>" 1194 */ 1195 if (!smack_privileged(CAP_MAC_ADMIN)) 1196 return -EPERM; 1197 if (*ppos != 0) 1198 return -EINVAL; 1199 if (count < SMK_NETLBLADDRMIN) 1200 return -EINVAL; 1201 1202 data = kzalloc(count + 1, GFP_KERNEL); 1203 if (data == NULL) 1204 return -ENOMEM; 1205 1206 if (copy_from_user(data, buf, count) != 0) { 1207 rc = -EFAULT; 1208 goto free_data_out; 1209 } 1210 1211 smack = kzalloc(count + 1, GFP_KERNEL); 1212 if (smack == NULL) { 1213 rc = -ENOMEM; 1214 goto free_data_out; 1215 } 1216 1217 data[count] = '\0'; 1218 1219 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s", 1220 &host[0], &host[1], &host[2], &host[3], &m, smack); 1221 if (rc != 6) { 1222 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s", 1223 &host[0], &host[1], &host[2], &host[3], smack); 1224 if (rc != 5) { 1225 rc = -EINVAL; 1226 goto free_out; 1227 } 1228 m = BEBITS; 1229 } 1230 if (m > BEBITS) { 1231 rc = -EINVAL; 1232 goto free_out; 1233 } 1234 1235 /* 1236 * If smack begins with '-', it is an option, don't import it 1237 */ 1238 if (smack[0] != '-') { 1239 skp = smk_import_entry(smack, 0); 1240 if (skp == NULL) { 1241 rc = -EINVAL; 1242 goto free_out; 1243 } 1244 } else { 1245 /* check known options */ 1246 if (strcmp(smack, smack_cipso_option.smk_known) == 0) 1247 skp = &smack_cipso_option; 1248 else { 1249 rc = -EINVAL; 1250 goto free_out; 1251 } 1252 } 1253 1254 for (temp_mask = 0; m > 0; m--) { 1255 temp_mask |= mask_bits; 1256 mask_bits >>= 1; 1257 } 1258 mask.s_addr = cpu_to_be32(temp_mask); 1259 1260 newname.sin_addr.s_addr &= mask.s_addr; 1261 /* 1262 * Only allow one writer at a time. Writes should be 1263 * quite rare and small in any case. 1264 */ 1265 mutex_lock(&smk_netlbladdr_lock); 1266 1267 nsa = newname.sin_addr.s_addr; 1268 /* try to find if the prefix is already in the list */ 1269 found = 0; 1270 list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) { 1271 if (snp->smk_host.sin_addr.s_addr == nsa && 1272 snp->smk_mask.s_addr == mask.s_addr) { 1273 found = 1; 1274 break; 1275 } 1276 } 1277 smk_netlabel_audit_set(&audit_info); 1278 1279 if (found == 0) { 1280 snp = kzalloc(sizeof(*snp), GFP_KERNEL); 1281 if (snp == NULL) 1282 rc = -ENOMEM; 1283 else { 1284 rc = 0; 1285 snp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr; 1286 snp->smk_mask.s_addr = mask.s_addr; 1287 snp->smk_label = skp; 1288 smk_netlbladdr_insert(snp); 1289 } 1290 } else { 1291 /* we delete the unlabeled entry, only if the previous label 1292 * wasn't the special CIPSO option */ 1293 if (snp->smk_label != &smack_cipso_option) 1294 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, 1295 &snp->smk_host.sin_addr, &snp->smk_mask, 1296 PF_INET, &audit_info); 1297 else 1298 rc = 0; 1299 snp->smk_label = skp; 1300 } 1301 1302 /* 1303 * Now tell netlabel about the single label nature of 1304 * this host so that incoming packets get labeled. 1305 * but only if we didn't get the special CIPSO option 1306 */ 1307 if (rc == 0 && skp != &smack_cipso_option) 1308 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, 1309 &snp->smk_host.sin_addr, &snp->smk_mask, PF_INET, 1310 snp->smk_label->smk_secid, &audit_info); 1311 1312 if (rc == 0) 1313 rc = count; 1314 1315 mutex_unlock(&smk_netlbladdr_lock); 1316 1317free_out: 1318 kfree(smack); 1319free_data_out: 1320 kfree(data); 1321 1322 return rc; 1323} 1324 1325static const struct file_operations smk_netlbladdr_ops = { 1326 .open = smk_open_netlbladdr, 1327 .read = seq_read, 1328 .llseek = seq_lseek, 1329 .write = smk_write_netlbladdr, 1330 .release = seq_release, 1331}; 1332 1333/** 1334 * smk_read_doi - read() for /smack/doi 1335 * @filp: file pointer, not actually used 1336 * @buf: where to put the result 1337 * @count: maximum to send along 1338 * @ppos: where to start 1339 * 1340 * Returns number of bytes read or error code, as appropriate 1341 */ 1342static ssize_t smk_read_doi(struct file *filp, char __user *buf, 1343 size_t count, loff_t *ppos) 1344{ 1345 char temp[80]; 1346 ssize_t rc; 1347 1348 if (*ppos != 0) 1349 return 0; 1350 1351 sprintf(temp, "%d", smk_cipso_doi_value); 1352 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); 1353 1354 return rc; 1355} 1356 1357/** 1358 * smk_write_doi - write() for /smack/doi 1359 * @file: file pointer, not actually used 1360 * @buf: where to get the data from 1361 * @count: bytes sent 1362 * @ppos: where to start 1363 * 1364 * Returns number of bytes written or error code, as appropriate 1365 */ 1366static ssize_t smk_write_doi(struct file *file, const char __user *buf, 1367 size_t count, loff_t *ppos) 1368{ 1369 char temp[80]; 1370 int i; 1371 1372 if (!smack_privileged(CAP_MAC_ADMIN)) 1373 return -EPERM; 1374 1375 if (count >= sizeof(temp) || count == 0) 1376 return -EINVAL; 1377 1378 if (copy_from_user(temp, buf, count) != 0) 1379 return -EFAULT; 1380 1381 temp[count] = '\0'; 1382 1383 if (sscanf(temp, "%d", &i) != 1) 1384 return -EINVAL; 1385 1386 smk_cipso_doi_value = i; 1387 1388 smk_cipso_doi(); 1389 1390 return count; 1391} 1392 1393static const struct file_operations smk_doi_ops = { 1394 .read = smk_read_doi, 1395 .write = smk_write_doi, 1396 .llseek = default_llseek, 1397}; 1398 1399/** 1400 * smk_read_direct - read() for /smack/direct 1401 * @filp: file pointer, not actually used 1402 * @buf: where to put the result 1403 * @count: maximum to send along 1404 * @ppos: where to start 1405 * 1406 * Returns number of bytes read or error code, as appropriate 1407 */ 1408static ssize_t smk_read_direct(struct file *filp, char __user *buf, 1409 size_t count, loff_t *ppos) 1410{ 1411 char temp[80]; 1412 ssize_t rc; 1413 1414 if (*ppos != 0) 1415 return 0; 1416 1417 sprintf(temp, "%d", smack_cipso_direct); 1418 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); 1419 1420 return rc; 1421} 1422 1423/** 1424 * smk_write_direct - write() for /smack/direct 1425 * @file: file pointer, not actually used 1426 * @buf: where to get the data from 1427 * @count: bytes sent 1428 * @ppos: where to start 1429 * 1430 * Returns number of bytes written or error code, as appropriate 1431 */ 1432static ssize_t smk_write_direct(struct file *file, const char __user *buf, 1433 size_t count, loff_t *ppos) 1434{ 1435 struct smack_known *skp; 1436 char temp[80]; 1437 int i; 1438 1439 if (!smack_privileged(CAP_MAC_ADMIN)) 1440 return -EPERM; 1441 1442 if (count >= sizeof(temp) || count == 0) 1443 return -EINVAL; 1444 1445 if (copy_from_user(temp, buf, count) != 0) 1446 return -EFAULT; 1447 1448 temp[count] = '\0'; 1449 1450 if (sscanf(temp, "%d", &i) != 1) 1451 return -EINVAL; 1452 1453 /* 1454 * Don't do anything if the value hasn't actually changed. 1455 * If it is changing reset the level on entries that were 1456 * set up to be direct when they were created. 1457 */ 1458 if (smack_cipso_direct != i) { 1459 mutex_lock(&smack_known_lock); 1460 list_for_each_entry_rcu(skp, &smack_known_list, list) 1461 if (skp->smk_netlabel.attr.mls.lvl == 1462 smack_cipso_direct) 1463 skp->smk_netlabel.attr.mls.lvl = i; 1464 smack_cipso_direct = i; 1465 mutex_unlock(&smack_known_lock); 1466 } 1467 1468 return count; 1469} 1470 1471static const struct file_operations smk_direct_ops = { 1472 .read = smk_read_direct, 1473 .write = smk_write_direct, 1474 .llseek = default_llseek, 1475}; 1476 1477/** 1478 * smk_read_mapped - read() for /smack/mapped 1479 * @filp: file pointer, not actually used 1480 * @buf: where to put the result 1481 * @count: maximum to send along 1482 * @ppos: where to start 1483 * 1484 * Returns number of bytes read or error code, as appropriate 1485 */ 1486static ssize_t smk_read_mapped(struct file *filp, char __user *buf, 1487 size_t count, loff_t *ppos) 1488{ 1489 char temp[80]; 1490 ssize_t rc; 1491 1492 if (*ppos != 0) 1493 return 0; 1494 1495 sprintf(temp, "%d", smack_cipso_mapped); 1496 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); 1497 1498 return rc; 1499} 1500 1501/** 1502 * smk_write_mapped - write() for /smack/mapped 1503 * @file: file pointer, not actually used 1504 * @buf: where to get the data from 1505 * @count: bytes sent 1506 * @ppos: where to start 1507 * 1508 * Returns number of bytes written or error code, as appropriate 1509 */ 1510static ssize_t smk_write_mapped(struct file *file, const char __user *buf, 1511 size_t count, loff_t *ppos) 1512{ 1513 struct smack_known *skp; 1514 char temp[80]; 1515 int i; 1516 1517 if (!smack_privileged(CAP_MAC_ADMIN)) 1518 return -EPERM; 1519 1520 if (count >= sizeof(temp) || count == 0) 1521 return -EINVAL; 1522 1523 if (copy_from_user(temp, buf, count) != 0) 1524 return -EFAULT; 1525 1526 temp[count] = '\0'; 1527 1528 if (sscanf(temp, "%d", &i) != 1) 1529 return -EINVAL; 1530 1531 /* 1532 * Don't do anything if the value hasn't actually changed. 1533 * If it is changing reset the level on entries that were 1534 * set up to be mapped when they were created. 1535 */ 1536 if (smack_cipso_mapped != i) { 1537 mutex_lock(&smack_known_lock); 1538 list_for_each_entry_rcu(skp, &smack_known_list, list) 1539 if (skp->smk_netlabel.attr.mls.lvl == 1540 smack_cipso_mapped) 1541 skp->smk_netlabel.attr.mls.lvl = i; 1542 smack_cipso_mapped = i; 1543 mutex_unlock(&smack_known_lock); 1544 } 1545 1546 return count; 1547} 1548 1549static const struct file_operations smk_mapped_ops = { 1550 .read = smk_read_mapped, 1551 .write = smk_write_mapped, 1552 .llseek = default_llseek, 1553}; 1554 1555/** 1556 * smk_read_ambient - read() for /smack/ambient 1557 * @filp: file pointer, not actually used 1558 * @buf: where to put the result 1559 * @cn: maximum to send along 1560 * @ppos: where to start 1561 * 1562 * Returns number of bytes read or error code, as appropriate 1563 */ 1564static ssize_t smk_read_ambient(struct file *filp, char __user *buf, 1565 size_t cn, loff_t *ppos) 1566{ 1567 ssize_t rc; 1568 int asize; 1569 1570 if (*ppos != 0) 1571 return 0; 1572 /* 1573 * Being careful to avoid a problem in the case where 1574 * smack_net_ambient gets changed in midstream. 1575 */ 1576 mutex_lock(&smack_ambient_lock); 1577 1578 asize = strlen(smack_net_ambient->smk_known) + 1; 1579 1580 if (cn >= asize) 1581 rc = simple_read_from_buffer(buf, cn, ppos, 1582 smack_net_ambient->smk_known, 1583 asize); 1584 else 1585 rc = -EINVAL; 1586 1587 mutex_unlock(&smack_ambient_lock); 1588 1589 return rc; 1590} 1591 1592/** 1593 * smk_write_ambient - write() for /smack/ambient 1594 * @file: file pointer, not actually used 1595 * @buf: where to get the data from 1596 * @count: bytes sent 1597 * @ppos: where to start 1598 * 1599 * Returns number of bytes written or error code, as appropriate 1600 */ 1601static ssize_t smk_write_ambient(struct file *file, const char __user *buf, 1602 size_t count, loff_t *ppos) 1603{ 1604 struct smack_known *skp; 1605 char *oldambient; 1606 char *data; 1607 int rc = count; 1608 1609 if (!smack_privileged(CAP_MAC_ADMIN)) 1610 return -EPERM; 1611 1612 data = kzalloc(count + 1, GFP_KERNEL); 1613 if (data == NULL) 1614 return -ENOMEM; 1615 1616 if (copy_from_user(data, buf, count) != 0) { 1617 rc = -EFAULT; 1618 goto out; 1619 } 1620 1621 skp = smk_import_entry(data, count); 1622 if (skp == NULL) { 1623 rc = -EINVAL; 1624 goto out; 1625 } 1626 1627 mutex_lock(&smack_ambient_lock); 1628 1629 oldambient = smack_net_ambient->smk_known; 1630 smack_net_ambient = skp; 1631 smk_unlbl_ambient(oldambient); 1632 1633 mutex_unlock(&smack_ambient_lock); 1634 1635out: 1636 kfree(data); 1637 return rc; 1638} 1639 1640static const struct file_operations smk_ambient_ops = { 1641 .read = smk_read_ambient, 1642 .write = smk_write_ambient, 1643 .llseek = default_llseek, 1644}; 1645 1646/** 1647 * smk_read_onlycap - read() for smackfs/onlycap 1648 * @filp: file pointer, not actually used 1649 * @buf: where to put the result 1650 * @cn: maximum to send along 1651 * @ppos: where to start 1652 * 1653 * Returns number of bytes read or error code, as appropriate 1654 */ 1655static ssize_t smk_read_onlycap(struct file *filp, char __user *buf, 1656 size_t cn, loff_t *ppos) 1657{ 1658 char *smack = ""; 1659 ssize_t rc = -EINVAL; 1660 int asize; 1661 1662 if (*ppos != 0) 1663 return 0; 1664 1665 if (smack_onlycap != NULL) 1666 smack = smack_onlycap->smk_known; 1667 1668 asize = strlen(smack) + 1; 1669 1670 if (cn >= asize) 1671 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); 1672 1673 return rc; 1674} 1675 1676/** 1677 * smk_write_onlycap - write() for smackfs/onlycap 1678 * @file: file pointer, not actually used 1679 * @buf: where to get the data from 1680 * @count: bytes sent 1681 * @ppos: where to start 1682 * 1683 * Returns number of bytes written or error code, as appropriate 1684 */ 1685static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, 1686 size_t count, loff_t *ppos) 1687{ 1688 char *data; 1689 struct smack_known *skp = smk_of_task(current->cred->security); 1690 int rc = count; 1691 1692 if (!smack_privileged(CAP_MAC_ADMIN)) 1693 return -EPERM; 1694 1695 /* 1696 * This can be done using smk_access() but is done 1697 * explicitly for clarity. The smk_access() implementation 1698 * would use smk_access(smack_onlycap, MAY_WRITE) 1699 */ 1700 if (smack_onlycap != NULL && smack_onlycap != skp) 1701 return -EPERM; 1702 1703 data = kzalloc(count + 1, GFP_KERNEL); 1704 if (data == NULL) 1705 return -ENOMEM; 1706 1707 /* 1708 * Should the null string be passed in unset the onlycap value. 1709 * This seems like something to be careful with as usually 1710 * smk_import only expects to return NULL for errors. It 1711 * is usually the case that a nullstring or "\n" would be 1712 * bad to pass to smk_import but in fact this is useful here. 1713 * 1714 * smk_import will also reject a label beginning with '-', 1715 * so "-usecapabilities" will also work. 1716 */ 1717 if (copy_from_user(data, buf, count) != 0) 1718 rc = -EFAULT; 1719 else 1720 smack_onlycap = smk_import_entry(data, count); 1721 1722 kfree(data); 1723 return rc; 1724} 1725 1726static const struct file_operations smk_onlycap_ops = { 1727 .read = smk_read_onlycap, 1728 .write = smk_write_onlycap, 1729 .llseek = default_llseek, 1730}; 1731 1732#ifdef CONFIG_SECURITY_SMACK_BRINGUP 1733/** 1734 * smk_read_unconfined - read() for smackfs/unconfined 1735 * @filp: file pointer, not actually used 1736 * @buf: where to put the result 1737 * @cn: maximum to send along 1738 * @ppos: where to start 1739 * 1740 * Returns number of bytes read or error code, as appropriate 1741 */ 1742static ssize_t smk_read_unconfined(struct file *filp, char __user *buf, 1743 size_t cn, loff_t *ppos) 1744{ 1745 char *smack = ""; 1746 ssize_t rc = -EINVAL; 1747 int asize; 1748 1749 if (*ppos != 0) 1750 return 0; 1751 1752 if (smack_unconfined != NULL) 1753 smack = smack_unconfined->smk_known; 1754 1755 asize = strlen(smack) + 1; 1756 1757 if (cn >= asize) 1758 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); 1759 1760 return rc; 1761} 1762 1763/** 1764 * smk_write_unconfined - write() for smackfs/unconfined 1765 * @file: file pointer, not actually used 1766 * @buf: where to get the data from 1767 * @count: bytes sent 1768 * @ppos: where to start 1769 * 1770 * Returns number of bytes written or error code, as appropriate 1771 */ 1772static ssize_t smk_write_unconfined(struct file *file, const char __user *buf, 1773 size_t count, loff_t *ppos) 1774{ 1775 char *data; 1776 int rc = count; 1777 1778 if (!smack_privileged(CAP_MAC_ADMIN)) 1779 return -EPERM; 1780 1781 data = kzalloc(count + 1, GFP_KERNEL); 1782 if (data == NULL) 1783 return -ENOMEM; 1784 1785 /* 1786 * Should the null string be passed in unset the unconfined value. 1787 * This seems like something to be careful with as usually 1788 * smk_import only expects to return NULL for errors. It 1789 * is usually the case that a nullstring or "\n" would be 1790 * bad to pass to smk_import but in fact this is useful here. 1791 * 1792 * smk_import will also reject a label beginning with '-', 1793 * so "-confine" will also work. 1794 */ 1795 if (copy_from_user(data, buf, count) != 0) 1796 rc = -EFAULT; 1797 else 1798 smack_unconfined = smk_import_entry(data, count); 1799 1800 kfree(data); 1801 return rc; 1802} 1803 1804static const struct file_operations smk_unconfined_ops = { 1805 .read = smk_read_unconfined, 1806 .write = smk_write_unconfined, 1807 .llseek = default_llseek, 1808}; 1809#endif /* CONFIG_SECURITY_SMACK_BRINGUP */ 1810 1811/** 1812 * smk_read_logging - read() for /smack/logging 1813 * @filp: file pointer, not actually used 1814 * @buf: where to put the result 1815 * @cn: maximum to send along 1816 * @ppos: where to start 1817 * 1818 * Returns number of bytes read or error code, as appropriate 1819 */ 1820static ssize_t smk_read_logging(struct file *filp, char __user *buf, 1821 size_t count, loff_t *ppos) 1822{ 1823 char temp[32]; 1824 ssize_t rc; 1825 1826 if (*ppos != 0) 1827 return 0; 1828 1829 sprintf(temp, "%d\n", log_policy); 1830 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); 1831 return rc; 1832} 1833 1834/** 1835 * smk_write_logging - write() for /smack/logging 1836 * @file: file pointer, not actually used 1837 * @buf: where to get the data from 1838 * @count: bytes sent 1839 * @ppos: where to start 1840 * 1841 * Returns number of bytes written or error code, as appropriate 1842 */ 1843static ssize_t smk_write_logging(struct file *file, const char __user *buf, 1844 size_t count, loff_t *ppos) 1845{ 1846 char temp[32]; 1847 int i; 1848 1849 if (!smack_privileged(CAP_MAC_ADMIN)) 1850 return -EPERM; 1851 1852 if (count >= sizeof(temp) || count == 0) 1853 return -EINVAL; 1854 1855 if (copy_from_user(temp, buf, count) != 0) 1856 return -EFAULT; 1857 1858 temp[count] = '\0'; 1859 1860 if (sscanf(temp, "%d", &i) != 1) 1861 return -EINVAL; 1862 if (i < 0 || i > 3) 1863 return -EINVAL; 1864 log_policy = i; 1865 return count; 1866} 1867 1868 1869 1870static const struct file_operations smk_logging_ops = { 1871 .read = smk_read_logging, 1872 .write = smk_write_logging, 1873 .llseek = default_llseek, 1874}; 1875 1876/* 1877 * Seq_file read operations for /smack/load-self 1878 */ 1879 1880static void *load_self_seq_start(struct seq_file *s, loff_t *pos) 1881{ 1882 struct task_smack *tsp = current_security(); 1883 1884 return smk_seq_start(s, pos, &tsp->smk_rules); 1885} 1886 1887static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos) 1888{ 1889 struct task_smack *tsp = current_security(); 1890 1891 return smk_seq_next(s, v, pos, &tsp->smk_rules); 1892} 1893 1894static int load_self_seq_show(struct seq_file *s, void *v) 1895{ 1896 struct list_head *list = v; 1897 struct smack_rule *srp = 1898 list_entry(list, struct smack_rule, list); 1899 1900 smk_rule_show(s, srp, SMK_LABELLEN); 1901 1902 return 0; 1903} 1904 1905static const struct seq_operations load_self_seq_ops = { 1906 .start = load_self_seq_start, 1907 .next = load_self_seq_next, 1908 .show = load_self_seq_show, 1909 .stop = smk_seq_stop, 1910}; 1911 1912 1913/** 1914 * smk_open_load_self - open() for /smack/load-self2 1915 * @inode: inode structure representing file 1916 * @file: "load" file pointer 1917 * 1918 * For reading, use load_seq_* seq_file reading operations. 1919 */ 1920static int smk_open_load_self(struct inode *inode, struct file *file) 1921{ 1922 return seq_open(file, &load_self_seq_ops); 1923} 1924 1925/** 1926 * smk_write_load_self - write() for /smack/load-self 1927 * @file: file pointer, not actually used 1928 * @buf: where to get the data from 1929 * @count: bytes sent 1930 * @ppos: where to start - must be 0 1931 * 1932 */ 1933static ssize_t smk_write_load_self(struct file *file, const char __user *buf, 1934 size_t count, loff_t *ppos) 1935{ 1936 struct task_smack *tsp = current_security(); 1937 1938 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, 1939 &tsp->smk_rules_lock, SMK_FIXED24_FMT); 1940} 1941 1942static const struct file_operations smk_load_self_ops = { 1943 .open = smk_open_load_self, 1944 .read = seq_read, 1945 .llseek = seq_lseek, 1946 .write = smk_write_load_self, 1947 .release = seq_release, 1948}; 1949 1950/** 1951 * smk_user_access - handle access check transaction 1952 * @file: file pointer 1953 * @buf: data from user space 1954 * @count: bytes sent 1955 * @ppos: where to start - must be 0 1956 */ 1957static ssize_t smk_user_access(struct file *file, const char __user *buf, 1958 size_t count, loff_t *ppos, int format) 1959{ 1960 struct smack_parsed_rule rule; 1961 char *data; 1962 int res; 1963 1964 data = simple_transaction_get(file, buf, count); 1965 if (IS_ERR(data)) 1966 return PTR_ERR(data); 1967 1968 if (format == SMK_FIXED24_FMT) { 1969 if (count < SMK_LOADLEN) 1970 return -EINVAL; 1971 res = smk_parse_rule(data, &rule, 0); 1972 } else { 1973 /* 1974 * simple_transaction_get() returns null-terminated data 1975 */ 1976 res = smk_parse_long_rule(data, &rule, 0, 3); 1977 } 1978 1979 if (res >= 0) 1980 res = smk_access(rule.smk_subject, rule.smk_object, 1981 rule.smk_access1, NULL); 1982 else if (res != -ENOENT) 1983 return -EINVAL; 1984 1985 /* 1986 * smk_access() can return a value > 0 in the "bringup" case. 1987 */ 1988 data[0] = res >= 0 ? '1' : '0'; 1989 data[1] = '\0'; 1990 1991 simple_transaction_set(file, 2); 1992 1993 if (format == SMK_FIXED24_FMT) 1994 return SMK_LOADLEN; 1995 return count; 1996} 1997 1998/** 1999 * smk_write_access - handle access check transaction 2000 * @file: file pointer 2001 * @buf: data from user space 2002 * @count: bytes sent 2003 * @ppos: where to start - must be 0 2004 */ 2005static ssize_t smk_write_access(struct file *file, const char __user *buf, 2006 size_t count, loff_t *ppos) 2007{ 2008 return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT); 2009} 2010 2011static const struct file_operations smk_access_ops = { 2012 .write = smk_write_access, 2013 .read = simple_transaction_read, 2014 .release = simple_transaction_release, 2015 .llseek = generic_file_llseek, 2016}; 2017 2018 2019/* 2020 * Seq_file read operations for /smack/load2 2021 */ 2022 2023static int load2_seq_show(struct seq_file *s, void *v) 2024{ 2025 struct list_head *list = v; 2026 struct smack_master_list *smlp = 2027 list_entry(list, struct smack_master_list, list); 2028 2029 smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL); 2030 2031 return 0; 2032} 2033 2034static const struct seq_operations load2_seq_ops = { 2035 .start = load2_seq_start, 2036 .next = load2_seq_next, 2037 .show = load2_seq_show, 2038 .stop = smk_seq_stop, 2039}; 2040 2041/** 2042 * smk_open_load2 - open() for /smack/load2 2043 * @inode: inode structure representing file 2044 * @file: "load2" file pointer 2045 * 2046 * For reading, use load2_seq_* seq_file reading operations. 2047 */ 2048static int smk_open_load2(struct inode *inode, struct file *file) 2049{ 2050 return seq_open(file, &load2_seq_ops); 2051} 2052 2053/** 2054 * smk_write_load2 - write() for /smack/load2 2055 * @file: file pointer, not actually used 2056 * @buf: where to get the data from 2057 * @count: bytes sent 2058 * @ppos: where to start - must be 0 2059 * 2060 */ 2061static ssize_t smk_write_load2(struct file *file, const char __user *buf, 2062 size_t count, loff_t *ppos) 2063{ 2064 /* 2065 * Must have privilege. 2066 */ 2067 if (!smack_privileged(CAP_MAC_ADMIN)) 2068 return -EPERM; 2069 2070 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, 2071 SMK_LONG_FMT); 2072} 2073 2074static const struct file_operations smk_load2_ops = { 2075 .open = smk_open_load2, 2076 .read = seq_read, 2077 .llseek = seq_lseek, 2078 .write = smk_write_load2, 2079 .release = seq_release, 2080}; 2081 2082/* 2083 * Seq_file read operations for /smack/load-self2 2084 */ 2085 2086static void *load_self2_seq_start(struct seq_file *s, loff_t *pos) 2087{ 2088 struct task_smack *tsp = current_security(); 2089 2090 return smk_seq_start(s, pos, &tsp->smk_rules); 2091} 2092 2093static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos) 2094{ 2095 struct task_smack *tsp = current_security(); 2096 2097 return smk_seq_next(s, v, pos, &tsp->smk_rules); 2098} 2099 2100static int load_self2_seq_show(struct seq_file *s, void *v) 2101{ 2102 struct list_head *list = v; 2103 struct smack_rule *srp = 2104 list_entry(list, struct smack_rule, list); 2105 2106 smk_rule_show(s, srp, SMK_LONGLABEL); 2107 2108 return 0; 2109} 2110 2111static const struct seq_operations load_self2_seq_ops = { 2112 .start = load_self2_seq_start, 2113 .next = load_self2_seq_next, 2114 .show = load_self2_seq_show, 2115 .stop = smk_seq_stop, 2116}; 2117 2118/** 2119 * smk_open_load_self2 - open() for /smack/load-self2 2120 * @inode: inode structure representing file 2121 * @file: "load" file pointer 2122 * 2123 * For reading, use load_seq_* seq_file reading operations. 2124 */ 2125static int smk_open_load_self2(struct inode *inode, struct file *file) 2126{ 2127 return seq_open(file, &load_self2_seq_ops); 2128} 2129 2130/** 2131 * smk_write_load_self2 - write() for /smack/load-self2 2132 * @file: file pointer, not actually used 2133 * @buf: where to get the data from 2134 * @count: bytes sent 2135 * @ppos: where to start - must be 0 2136 * 2137 */ 2138static ssize_t smk_write_load_self2(struct file *file, const char __user *buf, 2139 size_t count, loff_t *ppos) 2140{ 2141 struct task_smack *tsp = current_security(); 2142 2143 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, 2144 &tsp->smk_rules_lock, SMK_LONG_FMT); 2145} 2146 2147static const struct file_operations smk_load_self2_ops = { 2148 .open = smk_open_load_self2, 2149 .read = seq_read, 2150 .llseek = seq_lseek, 2151 .write = smk_write_load_self2, 2152 .release = seq_release, 2153}; 2154 2155/** 2156 * smk_write_access2 - handle access check transaction 2157 * @file: file pointer 2158 * @buf: data from user space 2159 * @count: bytes sent 2160 * @ppos: where to start - must be 0 2161 */ 2162static ssize_t smk_write_access2(struct file *file, const char __user *buf, 2163 size_t count, loff_t *ppos) 2164{ 2165 return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT); 2166} 2167 2168static const struct file_operations smk_access2_ops = { 2169 .write = smk_write_access2, 2170 .read = simple_transaction_read, 2171 .release = simple_transaction_release, 2172 .llseek = generic_file_llseek, 2173}; 2174 2175/** 2176 * smk_write_revoke_subj - write() for /smack/revoke-subject 2177 * @file: file pointer 2178 * @buf: data from user space 2179 * @count: bytes sent 2180 * @ppos: where to start - must be 0 2181 */ 2182static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf, 2183 size_t count, loff_t *ppos) 2184{ 2185 char *data = NULL; 2186 const char *cp = NULL; 2187 struct smack_known *skp; 2188 struct smack_rule *sp; 2189 struct list_head *rule_list; 2190 struct mutex *rule_lock; 2191 int rc = count; 2192 2193 if (*ppos != 0) 2194 return -EINVAL; 2195 2196 if (!smack_privileged(CAP_MAC_ADMIN)) 2197 return -EPERM; 2198 2199 if (count == 0 || count > SMK_LONGLABEL) 2200 return -EINVAL; 2201 2202 data = kzalloc(count, GFP_KERNEL); 2203 if (data == NULL) 2204 return -ENOMEM; 2205 2206 if (copy_from_user(data, buf, count) != 0) { 2207 rc = -EFAULT; 2208 goto free_out; 2209 } 2210 2211 cp = smk_parse_smack(data, count); 2212 if (cp == NULL) { 2213 rc = -EINVAL; 2214 goto free_out; 2215 } 2216 2217 skp = smk_find_entry(cp); 2218 if (skp == NULL) 2219 goto free_out; 2220 2221 rule_list = &skp->smk_rules; 2222 rule_lock = &skp->smk_rules_lock; 2223 2224 mutex_lock(rule_lock); 2225 2226 list_for_each_entry_rcu(sp, rule_list, list) 2227 sp->smk_access = 0; 2228 2229 mutex_unlock(rule_lock); 2230 2231free_out: 2232 kfree(data); 2233 kfree(cp); 2234 return rc; 2235} 2236 2237static const struct file_operations smk_revoke_subj_ops = { 2238 .write = smk_write_revoke_subj, 2239 .read = simple_transaction_read, 2240 .release = simple_transaction_release, 2241 .llseek = generic_file_llseek, 2242}; 2243 2244/** 2245 * smk_init_sysfs - initialize /sys/fs/smackfs 2246 * 2247 */ 2248static int smk_init_sysfs(void) 2249{ 2250 int err; 2251 err = sysfs_create_mount_point(fs_kobj, "smackfs"); 2252 if (err) 2253 return err; 2254 return 0; 2255} 2256 2257/** 2258 * smk_write_change_rule - write() for /smack/change-rule 2259 * @file: file pointer 2260 * @buf: data from user space 2261 * @count: bytes sent 2262 * @ppos: where to start - must be 0 2263 */ 2264static ssize_t smk_write_change_rule(struct file *file, const char __user *buf, 2265 size_t count, loff_t *ppos) 2266{ 2267 /* 2268 * Must have privilege. 2269 */ 2270 if (!smack_privileged(CAP_MAC_ADMIN)) 2271 return -EPERM; 2272 2273 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, 2274 SMK_CHANGE_FMT); 2275} 2276 2277static const struct file_operations smk_change_rule_ops = { 2278 .write = smk_write_change_rule, 2279 .read = simple_transaction_read, 2280 .release = simple_transaction_release, 2281 .llseek = generic_file_llseek, 2282}; 2283 2284/** 2285 * smk_read_syslog - read() for smackfs/syslog 2286 * @filp: file pointer, not actually used 2287 * @buf: where to put the result 2288 * @cn: maximum to send along 2289 * @ppos: where to start 2290 * 2291 * Returns number of bytes read or error code, as appropriate 2292 */ 2293static ssize_t smk_read_syslog(struct file *filp, char __user *buf, 2294 size_t cn, loff_t *ppos) 2295{ 2296 struct smack_known *skp; 2297 ssize_t rc = -EINVAL; 2298 int asize; 2299 2300 if (*ppos != 0) 2301 return 0; 2302 2303 if (smack_syslog_label == NULL) 2304 skp = &smack_known_star; 2305 else 2306 skp = smack_syslog_label; 2307 2308 asize = strlen(skp->smk_known) + 1; 2309 2310 if (cn >= asize) 2311 rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known, 2312 asize); 2313 2314 return rc; 2315} 2316 2317/** 2318 * smk_write_syslog - write() for smackfs/syslog 2319 * @file: file pointer, not actually used 2320 * @buf: where to get the data from 2321 * @count: bytes sent 2322 * @ppos: where to start 2323 * 2324 * Returns number of bytes written or error code, as appropriate 2325 */ 2326static ssize_t smk_write_syslog(struct file *file, const char __user *buf, 2327 size_t count, loff_t *ppos) 2328{ 2329 char *data; 2330 struct smack_known *skp; 2331 int rc = count; 2332 2333 if (!smack_privileged(CAP_MAC_ADMIN)) 2334 return -EPERM; 2335 2336 data = kzalloc(count + 1, GFP_KERNEL); 2337 if (data == NULL) 2338 return -ENOMEM; 2339 2340 if (copy_from_user(data, buf, count) != 0) 2341 rc = -EFAULT; 2342 else { 2343 skp = smk_import_entry(data, count); 2344 if (skp == NULL) 2345 rc = -EINVAL; 2346 else 2347 smack_syslog_label = smk_import_entry(data, count); 2348 } 2349 2350 kfree(data); 2351 return rc; 2352} 2353 2354static const struct file_operations smk_syslog_ops = { 2355 .read = smk_read_syslog, 2356 .write = smk_write_syslog, 2357 .llseek = default_llseek, 2358}; 2359 2360 2361/** 2362 * smk_read_ptrace - read() for /smack/ptrace 2363 * @filp: file pointer, not actually used 2364 * @buf: where to put the result 2365 * @count: maximum to send along 2366 * @ppos: where to start 2367 * 2368 * Returns number of bytes read or error code, as appropriate 2369 */ 2370static ssize_t smk_read_ptrace(struct file *filp, char __user *buf, 2371 size_t count, loff_t *ppos) 2372{ 2373 char temp[32]; 2374 ssize_t rc; 2375 2376 if (*ppos != 0) 2377 return 0; 2378 2379 sprintf(temp, "%d\n", smack_ptrace_rule); 2380 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); 2381 return rc; 2382} 2383 2384/** 2385 * smk_write_ptrace - write() for /smack/ptrace 2386 * @file: file pointer 2387 * @buf: data from user space 2388 * @count: bytes sent 2389 * @ppos: where to start - must be 0 2390 */ 2391static ssize_t smk_write_ptrace(struct file *file, const char __user *buf, 2392 size_t count, loff_t *ppos) 2393{ 2394 char temp[32]; 2395 int i; 2396 2397 if (!smack_privileged(CAP_MAC_ADMIN)) 2398 return -EPERM; 2399 2400 if (*ppos != 0 || count >= sizeof(temp) || count == 0) 2401 return -EINVAL; 2402 2403 if (copy_from_user(temp, buf, count) != 0) 2404 return -EFAULT; 2405 2406 temp[count] = '\0'; 2407 2408 if (sscanf(temp, "%d", &i) != 1) 2409 return -EINVAL; 2410 if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX) 2411 return -EINVAL; 2412 smack_ptrace_rule = i; 2413 2414 return count; 2415} 2416 2417static const struct file_operations smk_ptrace_ops = { 2418 .write = smk_write_ptrace, 2419 .read = smk_read_ptrace, 2420 .llseek = default_llseek, 2421}; 2422 2423/** 2424 * smk_fill_super - fill the smackfs superblock 2425 * @sb: the empty superblock 2426 * @data: unused 2427 * @silent: unused 2428 * 2429 * Fill in the well known entries for the smack filesystem 2430 * 2431 * Returns 0 on success, an error code on failure 2432 */ 2433static int smk_fill_super(struct super_block *sb, void *data, int silent) 2434{ 2435 int rc; 2436 struct inode *root_inode; 2437 2438 static struct tree_descr smack_files[] = { 2439 [SMK_LOAD] = { 2440 "load", &smk_load_ops, S_IRUGO|S_IWUSR}, 2441 [SMK_CIPSO] = { 2442 "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, 2443 [SMK_DOI] = { 2444 "doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, 2445 [SMK_DIRECT] = { 2446 "direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, 2447 [SMK_AMBIENT] = { 2448 "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, 2449 [SMK_NETLBLADDR] = { 2450 "netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR}, 2451 [SMK_ONLYCAP] = { 2452 "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR}, 2453 [SMK_LOGGING] = { 2454 "logging", &smk_logging_ops, S_IRUGO|S_IWUSR}, 2455 [SMK_LOAD_SELF] = { 2456 "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO}, 2457 [SMK_ACCESSES] = { 2458 "access", &smk_access_ops, S_IRUGO|S_IWUGO}, 2459 [SMK_MAPPED] = { 2460 "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR}, 2461 [SMK_LOAD2] = { 2462 "load2", &smk_load2_ops, S_IRUGO|S_IWUSR}, 2463 [SMK_LOAD_SELF2] = { 2464 "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO}, 2465 [SMK_ACCESS2] = { 2466 "access2", &smk_access2_ops, S_IRUGO|S_IWUGO}, 2467 [SMK_CIPSO2] = { 2468 "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR}, 2469 [SMK_REVOKE_SUBJ] = { 2470 "revoke-subject", &smk_revoke_subj_ops, 2471 S_IRUGO|S_IWUSR}, 2472 [SMK_CHANGE_RULE] = { 2473 "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR}, 2474 [SMK_SYSLOG] = { 2475 "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR}, 2476 [SMK_PTRACE] = { 2477 "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR}, 2478#ifdef CONFIG_SECURITY_SMACK_BRINGUP 2479 [SMK_UNCONFINED] = { 2480 "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR}, 2481#endif 2482 /* last one */ 2483 {""} 2484 }; 2485 2486 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); 2487 if (rc != 0) { 2488 printk(KERN_ERR "%s failed %d while creating inodes\n", 2489 __func__, rc); 2490 return rc; 2491 } 2492 2493 root_inode = d_inode(sb->s_root); 2494 2495 return 0; 2496} 2497 2498/** 2499 * smk_mount - get the smackfs superblock 2500 * @fs_type: passed along without comment 2501 * @flags: passed along without comment 2502 * @dev_name: passed along without comment 2503 * @data: passed along without comment 2504 * 2505 * Just passes everything along. 2506 * 2507 * Returns what the lower level code does. 2508 */ 2509static struct dentry *smk_mount(struct file_system_type *fs_type, 2510 int flags, const char *dev_name, void *data) 2511{ 2512 return mount_single(fs_type, flags, data, smk_fill_super); 2513} 2514 2515static struct file_system_type smk_fs_type = { 2516 .name = "smackfs", 2517 .mount = smk_mount, 2518 .kill_sb = kill_litter_super, 2519}; 2520 2521static struct vfsmount *smackfs_mount; 2522 2523static int __init smk_preset_netlabel(struct smack_known *skp) 2524{ 2525 skp->smk_netlabel.domain = skp->smk_known; 2526 skp->smk_netlabel.flags = 2527 NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; 2528 return smk_netlbl_mls(smack_cipso_direct, skp->smk_known, 2529 &skp->smk_netlabel, strlen(skp->smk_known)); 2530} 2531 2532/** 2533 * init_smk_fs - get the smackfs superblock 2534 * 2535 * register the smackfs 2536 * 2537 * Do not register smackfs if Smack wasn't enabled 2538 * on boot. We can not put this method normally under the 2539 * smack_init() code path since the security subsystem get 2540 * initialized before the vfs caches. 2541 * 2542 * Returns true if we were not chosen on boot or if 2543 * we were chosen and filesystem registration succeeded. 2544 */ 2545static int __init init_smk_fs(void) 2546{ 2547 int err; 2548 int rc; 2549 2550 if (!security_module_enable(&smack_ops)) 2551 return 0; 2552 2553 err = smk_init_sysfs(); 2554 if (err) 2555 printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n"); 2556 2557 err = register_filesystem(&smk_fs_type); 2558 if (!err) { 2559 smackfs_mount = kern_mount(&smk_fs_type); 2560 if (IS_ERR(smackfs_mount)) { 2561 printk(KERN_ERR "smackfs: could not mount!\n"); 2562 err = PTR_ERR(smackfs_mount); 2563 smackfs_mount = NULL; 2564 } 2565 } 2566 2567 smk_cipso_doi(); 2568 smk_unlbl_ambient(NULL); 2569 2570 rc = smk_preset_netlabel(&smack_known_floor); 2571 if (err == 0 && rc < 0) 2572 err = rc; 2573 rc = smk_preset_netlabel(&smack_known_hat); 2574 if (err == 0 && rc < 0) 2575 err = rc; 2576 rc = smk_preset_netlabel(&smack_known_huh); 2577 if (err == 0 && rc < 0) 2578 err = rc; 2579 rc = smk_preset_netlabel(&smack_known_invalid); 2580 if (err == 0 && rc < 0) 2581 err = rc; 2582 rc = smk_preset_netlabel(&smack_known_star); 2583 if (err == 0 && rc < 0) 2584 err = rc; 2585 rc = smk_preset_netlabel(&smack_known_web); 2586 if (err == 0 && rc < 0) 2587 err = rc; 2588 2589 return err; 2590} 2591 2592__initcall(init_smk_fs); 2593