src/afs/UKERNEL/osi_groups.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  * afs_xsetgroups (asserts FALSE)
  12  * setpag (aliased to use_setpag in sysincludes.h)
  13  */
  14 #include <afsconfig.h>
  15 #include "afs/param.h"
  16
  17
  18 #include "afs/sysincludes.h"
  19 #include "afsincludes.h"
  20 #include "afs/afs_stats.h"      /* statistics */
  21 #include "afs/afs_prototypes.h"
  22
  23 int
  24 afs_xsetgroups(void)
  25 {
  26     usr_assert(0);
  27     return 0;
  28 }
  29
  30 static int
  31 afs_getgroups(afs_ucred_t *cred, gid_t * gidset)
  32 {
  33     int ngrps, savengrps;
  34     gid_t *gp;
  35
  36     AFS_STATCNT(afs_getgroups);
  37
  38     gidset[0] = gidset[1] = 0;
  39     savengrps = ngrps = cred->cr_ngroups;
  40     gp = cred->cr_groups;
  41     while (ngrps--)
  42         *gidset++ = *gp++;
  43     return savengrps;
  44 }
  45
  46
  47
  48 static int
  49 afs_setgroups(afs_ucred_t **cred, int ngroups, gid_t * gidset,
  50               int change_parent)
  51 {
  52     gid_t *gp;
  53
  54     AFS_STATCNT(afs_setgroups);
  55
  56     if (ngroups > NGROUPS_MAX)
  57         return EINVAL;
  58     if (!change_parent)
  59         *cred = (afs_ucred_t *)crcopy(*cred);
  60     (*cred)->cr_ngroups = ngroups;
  61     gp = (*cred)->cr_groups;
  62     while (ngroups--)
  63         *gp++ = *gidset++;
  64     return (0);
  65 }
  66
  67 int
  68 usr_setpag(struct usr_ucred **cred, afs_uint32 pagvalue, afs_uint32 * newpag,
  69            int change_parent)
  70 {
  71     gid_t *gidset;
  72     int ngroups, code;
  73     int j;
  74
  75     AFS_STATCNT(setpag);
  76
  77     gidset = osi_AllocSmallSpace(AFS_SMALLOCSIZ);
  78     ngroups = afs_getgroups(*cred, gidset);
  79
  80     if (afs_get_pag_from_groups(gidset[0], gidset[1]) == NOPAG) {
  81         /* We will have to shift grouplist to make room for pag */
  82         if ((sizeof gidset[0]) * (ngroups + 2) > AFS_SMALLOCSIZ) {
  83             osi_FreeSmallSpace((char *)gidset);
  84             return (E2BIG);
  85         }
  86         for (j = ngroups - 1; j >= 0; j--) {
  87             gidset[j + 2] = gidset[j];
  88         }
  89         ngroups += 2;
  90     }
  91     *newpag = (pagvalue == -1 ? genpag() : pagvalue);
  92     afs_get_groups_from_pag(*newpag, &gidset[0], &gidset[1]);
  93     if ((code = afs_setgroups(cred, ngroups, gidset, change_parent))) {
  94         osi_FreeSmallSpace((char *)gidset);
  95         return (code);
  96     }
  97     osi_FreeSmallSpace((char *)gidset);
  98
  99     return 0;
 100 }