src/uss/uss_acl.c

   1 /*
   2  * Copyright 2000, International Business Machines Corporation and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 /*
  11  *      Implementation of the ACL and quota-related operations used
  12  *      by the AFS user account facility.
  13  */
  14
  15 /*
  16  * --------------------- Required definitions ---------------------
  17  */
  18 #include <afsconfig.h>
  19 #include <afs/param.h>
  20
  21 #include <roken.h>
  22
  23 #undef VIRTUE
  24 #undef VICE
  25 #include <afs/afsint.h>
  26 #include <afs/prs_fs.h>
  27 #include <afs/com_err.h>
  28 #include <afs/afs_consts.h>
  29 #include <rx/xdr.h>
  30
  31 #include "uss_acl.h"
  32 #include "uss_common.h"
  33 #include "uss_fs.h"
  34
  35 #define MAXNAME 100
  36
  37 #undef USS_ACL_DB
  38
  39 struct Acl {
  40     int nplus;
  41     int nminus;
  42     struct AclEntry *pluslist;
  43     struct AclEntry *minuslist;
  44 };
  45
  46 struct AclEntry {
  47     struct AclEntry *next;
  48     char name[MAXNAME];
  49     afs_int32 rights;
  50 };
  51
  52 static int PruneList(struct AclEntry **a_aclPP);
  53
  54
  55 /*------------------------------------------------------------------------
  56  * static foldcmp
  57  *
  58  * Description:
  59  *      String comparison with case-folding.
  60  *
  61  * Arguments:
  62  *      a_str1 : First string.
  63  *      a_str2 : Second string.
  64  *
  65  * Returns:
  66  *      0 if the two strings match,
  67  *      1 otherwise.
  68  *
  69  * Environment:
  70  *      Nothing interesting.
  71  *
  72  * Side Effects:
  73  *      As advertised.
  74  *------------------------------------------------------------------------*/
  75
  76 static int
  77 foldcmp(char *a_str1, char *a_str2)
  78 {                               /*foldcmp */
  79
  80     char t, u;
  81
  82     while (1) {
  83         t = *a_str1++;
  84         u = *a_str2++;
  85         if (t >= 'A' && t <= 'Z')
  86             t += 0x20;
  87         if (u >= 'A' && u <= 'Z')
  88             u += 0x20;
  89         if (t != u)
  90             return (1);         /*Difference */
  91         if (t == 0)
  92             return (0);         /*Match */
  93     }
  94 }                               /*foldcmp */
  95
  96
  97 /*------------------------------------------------------------------------
  98  * static Convert
  99  *
 100  * Description:
 101  *      Convert rights as expressed in a character string to an integer
 102  *      with the appropriate bits set.
 103  *
 104  * Arguments:
 105  *      a_rights : String version of access rights.
 106  *
 107  * Returns:
 108  *      Translated rights.
 109  *
 110  * Environment:
 111  *      Nothing interesting.
 112  *
 113  * Side Effects:
 114  *      Exits the program if a badly-formatted rights string is
 115  *      passed in.
 116  *------------------------------------------------------------------------*/
 117
 118 static afs_int32
 119 Convert(char *a_rights)
 120 {                               /*Convert */
 121
 122     int i, len;
 123     afs_int32 mode;
 124     char tc;
 125
 126     if (!strcmp(a_rights, "read"))
 127         return (PRSFS_READ | PRSFS_LOOKUP);
 128
 129     if (!strcmp(a_rights, "write"))
 130         return (PRSFS_READ | PRSFS_LOOKUP | PRSFS_INSERT | PRSFS_DELETE |
 131                 PRSFS_WRITE | PRSFS_LOCK);
 132
 133     if (!strcmp(a_rights, "mail"))
 134         return (PRSFS_INSERT | PRSFS_LOCK | PRSFS_LOOKUP);
 135
 136     if (!strcmp(a_rights, "all"))
 137         return (PRSFS_READ | PRSFS_LOOKUP | PRSFS_INSERT | PRSFS_DELETE |
 138                 PRSFS_WRITE | PRSFS_LOCK | PRSFS_ADMINISTER);
 139
 140     if (!strcmp(a_rights, "none"))
 141         return (0);
 142
 143     len = strlen(a_rights);
 144     mode = 0;
 145     for (i = 0; i < len; i++) {
 146         tc = *a_rights++;
 147         if (tc == 'r')
 148             mode |= PRSFS_READ;
 149         else if (tc == 'l')
 150             mode |= PRSFS_LOOKUP;
 151         else if (tc == 'i')
 152             mode |= PRSFS_INSERT;
 153         else if (tc == 'd')
 154             mode |= PRSFS_DELETE;
 155         else if (tc == 'w')
 156             mode |= PRSFS_WRITE;
 157         else if (tc == 'k')
 158             mode |= PRSFS_LOCK;
 159         else if (tc == 'a')
 160             mode |= PRSFS_ADMINISTER;
 161         else {
 162             printf("%s: Bogus rights character '%c'.\n", uss_whoami, tc);
 163             exit(1);
 164         }
 165     }
 166     return (mode);
 167
 168 }                               /*Convert */
 169
 170
 171 /*------------------------------------------------------------------------
 172  * static FindList
 173  *
 174  * Description:
 175  *      Find the entry with the given name in the passed-in ACL.
 176  *
 177  * Arguments:
 178  *      a_alist : Internalized ACL to look through.
 179  *      a_name  : Name to find.
 180  *
 181  * Returns:
 182  *      Ptr to the ACL entry found, or null pointer if none.
 183  *
 184  * Environment:
 185  *      Nothing interesting.
 186  *
 187  * Side Effects:
 188  *      As advertised.
 189  *------------------------------------------------------------------------*/
 190
 191 static struct AclEntry *
 192 FindList(struct AclEntry *a_alist, char *a_name)
 193 {                               /*FindList */
 194
 195     while (a_alist) {
 196         if (!foldcmp(a_alist->name, a_name))
 197             return (a_alist);
 198         a_alist = a_alist->next;
 199     }
 200     return (0);
 201
 202 }                               /*FindList */
 203
 204
 205 /*------------------------------------------------------------------------
 206  * static ChangeList
 207  *
 208  * Description:
 209  *      Set the rights for the named entry to the given value, creating
 210  *      an entry if one does not yet exist.
 211  *
 212  * Arguments:
 213  *      a_al     : Ptr to the internalized ACL.
 214  *      a_plus   : Positive or negative rights?
 215  *      a_name   : Name to look for.
 216  *      a_rights : Rights to set.
 217  *
 218  * Returns:
 219  *      0 if the two strings match,
 220  *      1 otherwise.
 221  *
 222  * Environment:
 223  *      Nothing interesting.
 224  *
 225  * Side Effects:
 226  *      As advertised.
 227  *------------------------------------------------------------------------*/
 228
 229 static void
 230 ChangeList(struct Acl *a_al, afs_int32 a_plus, char *a_name,
 231            afs_int32 a_rights)
 232 {                               /*ChangeList */
 233
 234     struct AclEntry *tlist;
 235
 236     tlist = (a_plus ? a_al->pluslist : a_al->minuslist);
 237     tlist = FindList(tlist, a_name);
 238     if (tlist) {
 239         /*
 240          * Found the item already in the list.
 241          */
 242         tlist->rights = a_rights;
 243         if (a_plus)
 244             a_al->nplus -= PruneList(&a_al->pluslist);
 245         else
 246             a_al->nminus -= PruneList(&a_al->minuslist);
 247         return;
 248     }
 249
 250     /*
 251      * Otherwise, we make a new item and plug in the new data.
 252      */
 253     tlist = malloc(sizeof(struct AclEntry));
 254     strcpy(tlist->name, a_name);
 255     tlist->rights = a_rights;
 256     if (a_plus) {
 257         tlist->next = a_al->pluslist;
 258         a_al->pluslist = tlist;
 259         a_al->nplus++;
 260         if (a_rights == 0)
 261             a_al->nplus -= PruneList(&a_al->pluslist);
 262     } else {
 263         tlist->next = a_al->minuslist;
 264         a_al->minuslist = tlist;
 265         a_al->nminus++;
 266         if (a_rights == 0)
 267             a_al->nminus -= PruneList(&a_al->minuslist);
 268     }
 269 }                               /*ChangeList */
 270
 271
 272 /*------------------------------------------------------------------------
 273  * static PruneList
 274  *
 275  * Description:
 276  *      Remove all entries whose rights fields are set to zero.
 277  *
 278  * Arguments:
 279  *      a_aclPP : Ptr to the location of the ACL to purne.
 280  *
 281  * Returns:
 282  *      Number of entries pruned off.
 283  *
 284  * Environment:
 285  *      Nothing interesting.
 286  *
 287  * Side Effects:
 288  *      As advertised.
 289  *------------------------------------------------------------------------*/
 290
 291 static int
 292 PruneList(struct AclEntry **a_aclPP)
 293 {                               /*PruneList */
 294
 295     struct AclEntry **lPP;
 296     struct AclEntry *tP, *nP;
 297     afs_int32 ctr;
 298
 299     ctr = 0;
 300     lPP = a_aclPP;
 301     for (tP = *a_aclPP; tP; tP = nP) {
 302         if (tP->rights == 0) {
 303             *lPP = tP->next;
 304             nP = tP->next;
 305             free(tP);
 306             ctr++;
 307         } else {
 308             nP = tP->next;
 309             lPP = &tP->next;
 310         }
 311     }
 312
 313     return (ctr);
 314
 315 }                               /*PruneList */
 316
 317
 318 /*------------------------------------------------------------------------
 319  * static SkipLine
 320  *
 321  * Description:
 322  *      Skip chars until we eat a newline.
 323  *
 324  * Arguments:
 325  *      a_str : String to process.
 326  *
 327  * Returns:
 328  *      Ptr to the first char past the newline.
 329  *
 330  * Environment:
 331  *      Nothing interesting.
 332  *
 333  * Side Effects:
 334  *      As advertised.
 335  *------------------------------------------------------------------------*/
 336
 337 static char *
 338 SkipLine(char *a_str)
 339 {                               /*SkipLine */
 340
 341     while (*a_str != '\n')
 342         a_str++;
 343     a_str++;
 344     return (a_str);
 345
 346 }                               /*SkipLine */
 347
 348
 349 /*------------------------------------------------------------------------
 350  * static EmptyAcl
 351  *
 352  * Description:
 353  *      Create an empty internalized ACL.
 354  *
 355  * Arguments:
 356  *      None.
 357  *
 358  * Returns:
 359  *      Ptr to an initialized and empty internalized ACL.
 360  *
 361  * Environment:
 362  *      Nothing interesting.
 363  *
 364  * Side Effects:
 365  *      As advertised.
 366  *------------------------------------------------------------------------*/
 367
 368 static struct Acl *
 369 EmptyAcl(void)
 370 {                               /*EmptyAcl */
 371
 372     struct Acl *tp;
 373
 374     tp = malloc(sizeof(struct Acl));
 375     tp->nplus = tp->nminus = 0;
 376     tp->pluslist = tp->minuslist = 0;
 377     return (tp);
 378
 379 }                               /*EmptyAcl */
 380
 381
 382 /*------------------------------------------------------------------------
 383  * static ParseAcl
 384  *
 385  * Description:
 386  *      Given an externalized ACL (i.e., in string format), convert it
 387  *      into its internalized form.
 388  *
 389  * Arguments:
 390  *      a_str : Ptr to Externalized ACL.
 391  *
 392  * Returns:
 393  *      Ptr to the equivalent internalized ACL.
 394  *
 395  * Environment:
 396  *      Nothing interesting.
 397  *
 398  * Side Effects:
 399  *      As advertised.
 400  *------------------------------------------------------------------------*/
 401
 402 static struct Acl *
 403 ParseAcl(char *a_str)
 404 {                               /*ParseAcl */
 405
 406     int nplus, nminus, i, trights;
 407     char tname[MAXNAME];
 408     struct AclEntry *first, *last, *tl;
 409     struct Acl *ta;
 410
 411     /*
 412      * Pull out the number of positive & negative entries in the externalized
 413      * ACL.
 414      */
 415     sscanf(a_str, "%d", &nplus);
 416     a_str = SkipLine(a_str);
 417     sscanf(a_str, "%d", &nminus);
 418     a_str = SkipLine(a_str);
 419
 420     /*
 421      * Allocate and initialize the first entry.
 422      */
 423     ta = malloc(sizeof(struct Acl));
 424     ta->nplus = nplus;
 425     ta->nminus = nminus;
 426
 427     /*
 428      * Translate the positive entries.
 429      */
 430     last = 0;
 431     first = 0;
 432     for (i = 0; i < nplus; i++) {
 433         sscanf(a_str, "%100s %d", tname, &trights);
 434         a_str = SkipLine(a_str);
 435         tl = malloc(sizeof(struct AclEntry));
 436         if (!first)
 437             first = tl;
 438         strcpy(tl->name, tname);
 439         tl->rights = trights;
 440         tl->next = 0;
 441         if (last)
 442             last->next = tl;
 443         last = tl;
 444     }
 445     ta->pluslist = first;
 446
 447     /*
 448      * Translate the negative entries.
 449      */
 450     last = 0;
 451     first = 0;
 452     for (i = 0; i < nminus; i++) {
 453         sscanf(a_str, "%100s %d", tname, &trights);
 454         a_str = SkipLine(a_str);
 455         tl = malloc(sizeof(struct AclEntry));
 456         if (!first)
 457             first = tl;
 458         strcpy(tl->name, tname);
 459         tl->rights = trights;
 460         tl->next = 0;
 461         if (last)
 462             last->next = tl;
 463         last = tl;
 464     }
 465     ta->minuslist = first;
 466
 467     return (ta);
 468
 469 }                               /*ParseAcl */
 470
 471
 472 /*------------------------------------------------------------------------
 473  * static AclToString
 474  *
 475  * Description:
 476  *      Given an internalized ACL, convert it to its externalized form,
 477  *      namely a character string.
 478  *
 479  * Arguments:
 480  *      a_acl : Internalized ACL to externalize.
 481  *
 482  * Returns:
 483  *      Ptr to the externalized version.
 484  *
 485  * Environment:
 486  *      Nothing interesting.
 487  *
 488  * Side Effects:
 489  *      As advertised.
 490  *------------------------------------------------------------------------*/
 491
 492 static char *
 493 AclToString(struct Acl *a_acl)
 494 {                               /*AclToString */
 495
 496     static char mydata[AFS_PIOCTL_MAXSIZE];
 497     char tstring[AFS_PIOCTL_MAXSIZE];
 498     struct AclEntry *tp;
 499
 500     /*
 501      * Print out the number of positive & negative entries on one line.
 502      */
 503     sprintf(mydata, "%d\n%d\n", a_acl->nplus, a_acl->nminus);
 504
 505     /*
 506      * Externalize the positive list.
 507      */
 508     for (tp = a_acl->pluslist; tp; tp = tp->next) {
 509         sprintf(tstring, "%s %d\n", tp->name, tp->rights);
 510         strcat(mydata, tstring);
 511     }
 512
 513     /*
 514      * Externalize the negative list.
 515      */
 516     for (tp = a_acl->minuslist; tp; tp = tp->next) {
 517         sprintf(tstring, "%s %d\n", tp->name, tp->rights);
 518         strcat(mydata, tstring);
 519     }
 520     return (mydata);
 521
 522 }                               /*AclToString */
 523
 524
 525 /*------------------------------------------------------------------------
 526  * static uss_acl_SetAccess
 527  *
 528  * Environment:
 529  *      ACL comes in as a single string, prefixed with the pathname to
 530  *      which the ACL is applied.  The a_clear argument, if set, causes
 531  *      us to act like sac instead of sa.
 532  *
 533  * Side Effects:
 534  *      As advertised.
 535  *------------------------------------------------------------------------*/
 536
 537 afs_int32
 538 uss_acl_SetAccess(char *a_access, int a_clear, int a_negative)
 539 {                               /*uss_acl_SetAccess */
 540
 541     afs_int32 code;
 542 #ifdef USS_ACL_DB
 543     static char rn[] = "uss_acl_SetAccess";
 544 #endif
 545     struct Acl *ta;
 546     char *externalizedACL;
 547     int plusp;
 548     afs_int32 rights;
 549     char tmp_str[AFS_PIOCTL_MAXSIZE];
 550     char path_field[AFS_PIOCTL_MAXSIZE], user_field[64], rights_field[64], *tp;
 551     int overflow;
 552
 553     plusp = !a_negative;
 554
 555     /*
 556      * Pull out the pathname from our argument.
 557      */
 558     tp = uss_common_FieldCp(path_field, a_access, ' ', sizeof(path_field),
 559                             &overflow);
 560     if (overflow) {
 561         fprintf(stderr, "%s: * Pathname field too long (max is %" AFS_SIZET_FMT " chars)\n",
 562                 uss_whoami, sizeof(path_field));
 563         return (-1);
 564     }
 565
 566     /*
 567      * Ask the Cache Manager to give us the externalized ACL for the
 568      * given directory.
 569      */
 570     code = uss_fs_GetACL(path_field, tmp_str, AFS_PIOCTL_MAXSIZE);
 571     if (code) {
 572         afs_com_err(uss_whoami, code, "while getting access list for %s",
 573                 path_field);
 574 #ifdef USS_ACL_DB
 575         printf("%s: Error code from uss_fs_GetACL %d, errno %d\n", rn, code,
 576                errno);
 577 #endif /* USS_ACL_DB */
 578         return (code);
 579     }
 580 #ifdef USS_ACL_DB
 581     else
 582         printf("%s: ACL for pathname '%s' is: '%s'\n", rn, path_field,
 583                tmp_str);
 584 #endif /* USS_ACL_DB */
 585
 586     /*
 587      * Generate the proper internalized ACL.
 588      */
 589     if (a_clear)
 590         ta = EmptyAcl();
 591     else
 592         ta = ParseAcl(tmp_str);
 593
 594     /*
 595      * For each given entry, pull out the information and alter the
 596      * internalized ACL to reflect it.
 597      */
 598     while (*tp != '\0') {
 599         tp = uss_common_FieldCp(user_field, tp, ' ', 64, &overflow);
 600         if (overflow) {
 601             fprintf(stderr, "%s: * User field too long (max is 64 chars)\n",
 602                     uss_whoami);
 603             return (-1);
 604         }
 605         if (*tp == '\0') {
 606             printf("%s: Missing second half of user/access pair.\n",
 607                    uss_whoami);
 608             return (1);
 609         }
 610         tp = uss_common_FieldCp(rights_field, tp, ' ', 64, &overflow);
 611         if (overflow) {
 612             fprintf(stderr, "%s: * Rights field too long (max is 64 chars)\n",
 613                     uss_whoami);
 614             return (-1);
 615         }
 616         rights = Convert(rights_field);
 617         ChangeList(ta, plusp, user_field, rights);
 618     }
 619
 620     /*
 621      * Externalize the fully-processed internal ACL, then pass it back
 622      * to the Cache Manager.
 623      */
 624     externalizedACL = AclToString(ta);
 625     code =
 626         uss_fs_SetACL(path_field, externalizedACL,
 627                       strlen(externalizedACL) + 1);
 628     if (code) {
 629 #ifdef USS_ACL_DB
 630         printf("%s: uss_fs_SetACL() failed, code is %d, errno is %d\n", rn,
 631                code, errno);
 632 #endif /* USS_ACL_DB */
 633         if (errno == EINVAL) {
 634             printf("Can't set ACL for directory '%s' to '%s'\n", path_field,
 635                    externalizedACL);
 636             printf("Invalid argument, possible reasons include:\n");
 637             printf("\t1. File not in AFS, or\n");
 638             printf("\t2. Too many users on the ACL, or\n");
 639             printf("\t3. Non-existent user or group on ACL.\n");
 640             return (code);
 641         } else {
 642             afs_com_err(uss_whoami, code, "while setting the access list");
 643             return (code);
 644         }
 645     }
 646     return (0);
 647
 648 }                               /*uss_acl_SetAccess */
 649
 650
 651 /*------------------------------------------------------------------------
 652  * static us_acl_SetDiskQuota
 653  *
 654  * Environment:
 655  *      Nothing interesting.
 656  *
 657  * Side Effects:
 658  *      As advertised.
 659  *------------------------------------------------------------------------*/
 660
 661 afs_int32
 662 uss_acl_SetDiskQuota(char *a_path, int a_q)
 663 {                               /*uss_acl_SetDiskQuota */
 664
 665     afs_int32 code;
 666 #ifdef USS_ACL_DB
 667     static char rn[] = "uss_acl_SetDiskQuota";
 668 #endif
 669     uss_VolumeStatus_t *status;
 670     char *input;
 671     char tmp_str[AFS_PIOCTL_MAXSIZE];
 672
 673     if (uss_verbose)
 674         fprintf(stderr,
 675                 "Setting disk quota on volume mounted at '%s' to %d blocks\n",
 676                 a_path, a_q);
 677
 678     status = (uss_VolumeStatus_t *) tmp_str;
 679     status->MinQuota = status->MaxQuota = -1;
 680     status->MaxQuota = a_q;
 681
 682     input = (char *)status + sizeof(*status);
 683     *(input++) = '\0';
 684     *(input++) = '\0';
 685     *(input++) = '\0';
 686
 687     code = uss_fs_SetVolStat(a_path, tmp_str, sizeof(*status) + 3);
 688     if (code) {
 689         afs_com_err(uss_whoami, code, "while setting disk quota");
 690 #ifdef USS_ACL_DB
 691         printf("%s: uss_fs_SetVolStat() error code: %d, errno is %d\n", rn,
 692                code, errno);
 693 #endif /* USS_ACL_DB */
 694         return (code);
 695     }
 696
 697     return (0);
 698
 699 }                               /*uss_acl_SetDiskQuota */
 700
 701
 702 /*-----------------------------------------------------------------------
 703  * EXPORTED uss_acl_CleanUp
 704  *
 705  * Environment:
 706  *      The uss_currentDir variable contains directories touched by the
 707  *      given operation.
 708  *
 709  * Side Effects:
 710  *      As advertised.
 711  *------------------------------------------------------------------------*/
 712
 713 afs_int32
 714 uss_acl_CleanUp(void)
 715 {                               /*uss_acl_CleanUp */
 716
 717     struct uss_subdir *t, *old_t = NULL;
 718     char tmp_str[uss_MAX_SIZE];
 719
 720     /*
 721      * Restore the ACL for each directory created for our caller to its
 722      * original setting.  The uss_AccountCreator's access was (potentially)
 723      * amplified to full rights - any excess ability must now be removed.
 724      */
 725     for (t = uss_currentDir; t != NULL; t = t->previous) {
 726         sprintf(tmp_str, "%s %s", t->path, t->finalACL);
 727         if (uss_verbose)
 728             fprintf(stderr, "Setting ACL: '%s'\n", tmp_str);
 729         if (!uss_DryRun)
 730             uss_acl_SetAccess(tmp_str, 1, 0);
 731         else
 732             fprintf(stderr, "\t[Dry run: uss_acl_SetAccess(%s) on '%s']\n",
 733                     tmp_str, t->path);
 734         free(t->path);
 735         if (old_t)
 736             free(old_t);
 737         old_t = t;
 738     }                           /*Remove caller from user directory ACL */
 739
 740     if (old_t)
 741         free(old_t);
 742
 743     /*
 744      * Return successfully.
 745      */
 746     return (0);
 747
 748 }                               /*uss_acl_CleanUp */