source4/lib/policy/gp_manage.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  Group Policy Object Support
   4  *  Copyright (C) Wilco Baan Hofman 2010
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19 #include "includes.h"
  20 #include "../libcli/security/dom_sid.h"
  21 #include "../libcli/security/security_descriptor.h"
  22 #include "../librpc/ndr/libndr.h"
  23 #include "../lib/util/charset/charset.h"
  24 #include "param/param.h"
  25 #include "lib/policy/policy.h"
  26
  27 static uint32_t gp_ads_to_dir_access_mask(uint32_t access_mask)
  28 {
  29         uint32_t fs_mask;
  30
  31         /* Copy the standard access mask */
  32         fs_mask = access_mask & 0x001F0000;
  33
  34         /* When READ_PROP and LIST_CONTENTS are set, read access is granted on the GPT */
  35         if (access_mask & SEC_ADS_READ_PROP && access_mask & SEC_ADS_LIST) {
  36                 fs_mask |= SEC_STD_SYNCHRONIZE | SEC_DIR_LIST | SEC_DIR_READ_ATTRIBUTE |
  37                                 SEC_DIR_READ_EA | SEC_DIR_TRAVERSE;
  38         }
  39
  40         /* When WRITE_PROP is set, full write access is granted on the GPT */
  41         if (access_mask & SEC_ADS_WRITE_PROP) {
  42                 fs_mask |= SEC_STD_SYNCHRONIZE | SEC_DIR_WRITE_ATTRIBUTE |
  43                                 SEC_DIR_WRITE_EA | SEC_DIR_ADD_FILE |
  44                                 SEC_DIR_ADD_SUBDIR;
  45         }
  46
  47         /* Map CREATE_CHILD to add file and add subdir */
  48         if (access_mask & SEC_ADS_CREATE_CHILD)
  49                 fs_mask |= SEC_DIR_ADD_FILE | SEC_DIR_ADD_SUBDIR;
  50
  51         /* Map ADS delete child to dir delete child */
  52         if (access_mask & SEC_ADS_DELETE_CHILD)
  53                 fs_mask |= SEC_DIR_DELETE_CHILD;
  54
  55         return fs_mask;
  56 }
  57
  58 NTSTATUS gp_create_gpt_security_descriptor (TALLOC_CTX *mem_ctx, struct security_descriptor *ds_sd, struct security_descriptor **ret)
  59 {
  60         struct security_descriptor *fs_sd;
  61         NTSTATUS status;
  62         uint32_t i;
  63
  64         /* Allocate the file system security descriptor */
  65         fs_sd = talloc(mem_ctx, struct security_descriptor);
  66         NT_STATUS_HAVE_NO_MEMORY(fs_sd);
  67
  68         /* Copy the basic information from the directory server security descriptor */
  69         fs_sd->owner_sid = talloc_memdup(fs_sd, ds_sd->owner_sid, sizeof(struct dom_sid));
  70         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(fs_sd->owner_sid, fs_sd);
  71
  72         fs_sd->group_sid = talloc_memdup(fs_sd, ds_sd->group_sid, sizeof(struct dom_sid));
  73         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(fs_sd->group_sid, fs_sd);
  74
  75         fs_sd->type = ds_sd->type;
  76         fs_sd->revision = ds_sd->revision;
  77
  78         /* Copy the sacl */
  79         fs_sd->sacl = security_acl_dup(fs_sd, ds_sd->sacl);
  80         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(fs_sd->sacl, fs_sd);
  81
  82         /* Copy the dacl */
  83         fs_sd->dacl = talloc_zero(fs_sd, struct security_acl);
  84         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(fs_sd->dacl, fs_sd);
  85
  86         for (i = 0; i < ds_sd->dacl->num_aces; i++) {
  87                 char *trustee = dom_sid_string(fs_sd, &ds_sd->dacl->aces[i].trustee);
  88                 struct security_ace *ace;
  89
  90                 /* Don't add the allow for SID_BUILTIN_PREW2K */
  91                 if (!(ds_sd->dacl->aces[i].type & SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT) &&
  92                                 strcmp(trustee, SID_BUILTIN_PREW2K) == 0) {
  93                         talloc_free(trustee);
  94                         continue;
  95                 }
  96
  97                 /* Copy the ace from the directory server security descriptor */
  98                 ace = talloc_memdup(fs_sd, &ds_sd->dacl->aces[i], sizeof(struct security_ace));
  99                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(ace, fs_sd);
 100
 101                 /* Set specific inheritance flags for within the GPO */
 102                 ace->flags |= SEC_ACE_FLAG_OBJECT_INHERIT | SEC_ACE_FLAG_CONTAINER_INHERIT;
 103                 if (strcmp(trustee, SID_CREATOR_OWNER) == 0) {
 104                         ace->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
 105                 }
 106
 107                 /* Get a directory access mask from the assigned access mask on the LDAP object */
 108                 ace->access_mask = gp_ads_to_dir_access_mask(ace->access_mask);
 109
 110                 /* Add the ace to the security descriptor DACL */
 111                 status = security_descriptor_dacl_add(fs_sd, ace);
 112                 if (!NT_STATUS_IS_OK(status)) {
 113                         DEBUG(0, ("Failed to add a dacl to file system security descriptor\n"));
 114                         return status;
 115                 }
 116
 117                 /* Clean up the allocated data in this iteration */
 118                 talloc_free(trustee);
 119         }
 120
 121         *ret = fs_sd;
 122         return NT_STATUS_OK;
 123 }
 124
 125
 126 NTSTATUS gp_create_gpo (struct gp_context *gp_ctx, const char *display_name, struct gp_object **ret)
 127 {
 128         struct GUID guid_struct;
 129         char *guid_str;
 130         char *name;
 131         struct security_descriptor *sd;
 132         TALLOC_CTX *mem_ctx;
 133         struct gp_object *gpo;
 134         NTSTATUS status;
 135
 136         /* Create a forked memory context, as a base for everything here */
 137         mem_ctx = talloc_new(gp_ctx);
 138         NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
 139
 140         /* Create the gpo struct to return later */
 141         gpo = talloc(gp_ctx, struct gp_object);
 142         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(gpo, mem_ctx);
 143
 144         /* Generate a GUID */
 145         guid_struct = GUID_random();
 146         guid_str = GUID_string2(mem_ctx, &guid_struct);
 147         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(guid_str, mem_ctx);
 148         name = strupper_talloc(mem_ctx, guid_str);
 149         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(name, mem_ctx);
 150
 151         /* Prepare the GPO struct */
 152         gpo->dn = NULL;
 153         gpo->name = name;
 154         gpo->flags = 0;
 155         gpo->version = 0;
 156         gpo->display_name = talloc_strdup(gpo, display_name);
 157         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(gpo->display_name, mem_ctx);
 158
 159         gpo->file_sys_path = talloc_asprintf(gpo, "\\\\%s\\sysvol\\%s\\Policies\\%s", lpcfg_dnsdomain(gp_ctx->lp_ctx), lpcfg_dnsdomain(gp_ctx->lp_ctx), name);
 160         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(gpo->file_sys_path, mem_ctx);
 161
 162         /* Create the GPT */
 163         status = gp_create_gpt(gp_ctx, name, gpo->file_sys_path);
 164         if (!NT_STATUS_IS_OK(status)) {
 165                 DEBUG(0, ("Failed to create GPT\n"));
 166                 talloc_free(mem_ctx);
 167                 return status;
 168         }
 169
 170
 171         /* Create the LDAP GPO, including CN=User and CN=Machine */
 172         status = gp_create_ldap_gpo(gp_ctx, gpo);
 173         if (!NT_STATUS_IS_OK(status)) {
 174                 DEBUG(0, ("Failed to create LDAP group policy object\n"));
 175                 talloc_free(mem_ctx);
 176                 return status;
 177         }
 178
 179         /* Get the new security descriptor */
 180         status = gp_get_gpo_info(gp_ctx, gpo->dn, &gpo);
 181         if (!NT_STATUS_IS_OK(status)) {
 182                 DEBUG(0, ("Failed to fetch LDAP group policy object\n"));
 183                 talloc_free(mem_ctx);
 184                 return status;
 185         }
 186
 187         /* Create matching file and DS security descriptors */
 188         status = gp_create_gpt_security_descriptor(mem_ctx, gpo->security_descriptor, &sd);
 189         if (!NT_STATUS_IS_OK(status)) {
 190                 DEBUG(0, ("Failed to convert ADS security descriptor to filesystem security descriptor\n"));
 191                 talloc_free(mem_ctx);
 192                 return status;
 193         }
 194
 195         /* Set the security descriptor on the filesystem for this GPO */
 196         status = gp_set_gpt_security_descriptor(gp_ctx, gpo, sd);
 197         if (!NT_STATUS_IS_OK(status)) {
 198                 DEBUG(0, ("Failed to set security descriptor (ACL) on the file system\n"));
 199                 talloc_free(mem_ctx);
 200                 return status;
 201         }
 202
 203         talloc_free(mem_ctx);
 204
 205         *ret = gpo;
 206         return NT_STATUS_OK;
 207 }
 208
 209 NTSTATUS gp_set_acl (struct gp_context *gp_ctx, const char *dn_str, const struct security_descriptor *sd)
 210 {
 211         TALLOC_CTX *mem_ctx;
 212         struct security_descriptor *fs_sd;
 213         struct gp_object *gpo;
 214         NTSTATUS status;
 215
 216         /* Create a forked memory context, as a base for everything here */
 217         mem_ctx = talloc_new(gp_ctx);
 218         NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
 219
 220         /* Set the ACL on LDAP database */
 221         status = gp_set_ads_acl(gp_ctx, dn_str, sd);
 222         if (!NT_STATUS_IS_OK(status)) {
 223                 DEBUG(0, ("Failed to set ACL on ADS\n"));
 224                 talloc_free(mem_ctx);
 225                 return status;
 226         }
 227
 228         /* Get the group policy object information, for filesystem location and merged sd */
 229         status = gp_get_gpo_info(gp_ctx, dn_str, &gpo);
 230         if (!NT_STATUS_IS_OK(status)) {
 231                 DEBUG(0, ("Failed to set ACL on ADS\n"));
 232                 talloc_free(mem_ctx);
 233                 return status;
 234         }
 235
 236         /* Create matching file and DS security descriptors */
 237         status = gp_create_gpt_security_descriptor(mem_ctx, gpo->security_descriptor, &fs_sd);
 238         if (!NT_STATUS_IS_OK(status)) {
 239                 DEBUG(0, ("Failed to convert ADS security descriptor to filesystem security descriptor\n"));
 240                 talloc_free(mem_ctx);
 241                 return status;
 242         }
 243
 244         /* Set the security descriptor on the filesystem for this GPO */
 245         status = gp_set_gpt_security_descriptor(gp_ctx, gpo, fs_sd);
 246         if (!NT_STATUS_IS_OK(status)) {
 247                 DEBUG(0, ("Failed to set security descriptor (ACL) on the file system\n"));
 248                 talloc_free(mem_ctx);
 249                 return status;
 250         }
 251
 252         talloc_free(mem_ctx);
 253         return NT_STATUS_OK;
 254 }
 255
 256 NTSTATUS gp_push_gpo (struct gp_context *gp_ctx, const char *local_path, struct gp_object *gpo)
 257 {
 258         NTSTATUS status;
 259         TALLOC_CTX *mem_ctx;
 260         struct gp_ini_context *ini;
 261         char *filename;
 262
 263         mem_ctx = talloc_new(gp_ctx);
 264         NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
 265
 266         /* Get version from ini file */
 267         /* FIXME: The local file system may be case sensitive */
 268         filename = talloc_asprintf(mem_ctx, "%s/%s", local_path, "GPT.INI");
 269         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(filename, mem_ctx);
 270         status = gp_parse_ini(mem_ctx, gp_ctx, local_path, &ini);
 271         if (!NT_STATUS_IS_OK(status)) {
 272                 DEBUG(0, ("Failed to parse GPT.INI.\n"));
 273                 talloc_free(mem_ctx);
 274                 return status;
 275         }
 276
 277         /* Push the GPT to the remote sysvol */
 278         status = gp_push_gpt(gp_ctx, local_path, gpo->file_sys_path);
 279         if (!NT_STATUS_IS_OK(status)) {
 280                 DEBUG(0, ("Failed to push GPT to DC's sysvol share.\n"));
 281                 talloc_free(mem_ctx);
 282                 return status;
 283         }
 284
 285         /* Write version to LDAP */
 286         status = gp_set_ldap_gpo(gp_ctx, gpo);
 287         if (!NT_STATUS_IS_OK(status)) {
 288                 DEBUG(0, ("Failed to set GPO options in DC's LDAP.\n"));
 289                 talloc_free(mem_ctx);
 290                 return status;
 291         }
 292
 293         talloc_free(mem_ctx);
 294         return NT_STATUS_OK;
 295 }