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