auth/gensec/gensec_util.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Generic Authentication Interface
   5
   6    Copyright (C) Andrew Tridgell 2003
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2006
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "auth/gensec/gensec.h"
  25 #include "auth/common_auth.h"
  26
  27 NTSTATUS gensec_generate_session_info_pac(TALLOC_CTX *mem_ctx,
  28                                           struct gensec_security *gensec_security,
  29                                           struct smb_krb5_context *smb_krb5_context,
  30                                           DATA_BLOB *pac_blob,
  31                                           const char *principal_string,
  32                                           const struct tsocket_address *remote_address,
  33                                           struct auth_session_info **session_info)
  34 {
  35         uint32_t session_info_flags = 0;
  36
  37         if (gensec_security->want_features & GENSEC_FEATURE_UNIX_TOKEN) {
  38                 session_info_flags |= AUTH_SESSION_INFO_UNIX_TOKEN;
  39         }
  40
  41         session_info_flags |= AUTH_SESSION_INFO_DEFAULT_GROUPS;
  42
  43         if (!pac_blob) {
  44                 if (!gensec_setting_bool(gensec_security->settings, "gensec", "require_pac", false)) {
  45                         DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access\n",
  46                                   principal_string));
  47                         return NT_STATUS_ACCESS_DENIED;
  48                 }
  49                 DEBUG(1, ("Unable to find PAC for %s, resorting to local user lookup\n",
  50                           principal_string));
  51         }
  52
  53         if (gensec_security->auth_context && gensec_security->auth_context->generate_session_info_pac) {
  54                 return gensec_security->auth_context->generate_session_info_pac(gensec_security->auth_context,
  55                                                                                 mem_ctx,
  56                                                                                 smb_krb5_context,
  57                                                                                 pac_blob,
  58                                                                                 principal_string,
  59                                                                                 remote_address,
  60                                                                                 session_info_flags,
  61                                                                                 session_info);
  62         } else {
  63                 DEBUG(0, ("Cannot generate a session_info without the auth_context\n"));
  64                 return NT_STATUS_INTERNAL_ERROR;
  65         }
  66 }
  67
  68 /*
  69  * These functions are for use in the deprecated
  70  * gensec_socket code (public because SPNEGO must
  71  * use them for recursion)
  72  */
  73 _PUBLIC_ NTSTATUS gensec_wrap_packets(struct gensec_security *gensec_security,
  74                              TALLOC_CTX *mem_ctx,
  75                              const DATA_BLOB *in,
  76                              DATA_BLOB *out,
  77                              size_t *len_processed)
  78 {
  79         if (!gensec_security->ops->wrap_packets) {
  80                 NTSTATUS nt_status;
  81                 size_t max_input_size;
  82                 DATA_BLOB unwrapped, wrapped;
  83                 max_input_size = gensec_max_input_size(gensec_security);
  84                 unwrapped = data_blob_const(in->data, MIN(max_input_size, (size_t)in->length));
  85
  86                 nt_status = gensec_wrap(gensec_security,
  87                                         mem_ctx,
  88                                         &unwrapped, &wrapped);
  89                 if (!NT_STATUS_IS_OK(nt_status)) {
  90                         return nt_status;
  91                 }
  92
  93                 *out = data_blob_talloc(mem_ctx, NULL, 4);
  94                 if (!out->data) {
  95                         return NT_STATUS_NO_MEMORY;
  96                 }
  97                 RSIVAL(out->data, 0, wrapped.length);
  98
  99                 if (!data_blob_append(mem_ctx, out, wrapped.data, wrapped.length)) {
 100                         return NT_STATUS_NO_MEMORY;
 101                 }
 102                 *len_processed = unwrapped.length;
 103                 return NT_STATUS_OK;
 104         }
 105         return gensec_security->ops->wrap_packets(gensec_security, mem_ctx, in, out,
 106                                                   len_processed);
 107 }
 108
 109 /*
 110  * These functions are for use in the deprecated
 111  * gensec_socket code (public because SPNEGO must
 112  * use them for recursion)
 113  */
 114 NTSTATUS gensec_unwrap_packets(struct gensec_security *gensec_security,
 115                                         TALLOC_CTX *mem_ctx,
 116                                         const DATA_BLOB *in,
 117                                         DATA_BLOB *out,
 118                                         size_t *len_processed)
 119 {
 120         if (!gensec_security->ops->unwrap_packets) {
 121                 DATA_BLOB wrapped;
 122                 NTSTATUS nt_status;
 123                 size_t packet_size;
 124                 if (in->length < 4) {
 125                         /* Missing the header we already had! */
 126                         DEBUG(0, ("Asked to unwrap packet of bogus length!  How did we get the short packet?!\n"));
 127                         return NT_STATUS_INVALID_PARAMETER;
 128                 }
 129
 130                 packet_size = RIVAL(in->data, 0);
 131
 132                 wrapped = data_blob_const(in->data + 4, packet_size);
 133
 134                 if (wrapped.length > (in->length - 4)) {
 135                         DEBUG(0, ("Asked to unwrap packed of bogus length %d > %d!  How did we get this?!\n",
 136                                   (int)wrapped.length, (int)(in->length - 4)));
 137                         return NT_STATUS_INTERNAL_ERROR;
 138                 }
 139
 140                 nt_status = gensec_unwrap(gensec_security,
 141                                           mem_ctx,
 142                                           &wrapped, out);
 143                 if (!NT_STATUS_IS_OK(nt_status)) {
 144                         return nt_status;
 145                 }
 146
 147                 *len_processed = packet_size + 4;
 148                 return nt_status;
 149         }
 150         return gensec_security->ops->unwrap_packets(gensec_security, mem_ctx, in, out,
 151                                                     len_processed);
 152 }
 153
 154 /*
 155  * These functions are for use in the deprecated
 156  * gensec_socket code (public because SPNEGO must
 157  * use them for recursion)
 158  */
 159 NTSTATUS gensec_packet_full_request(struct gensec_security *gensec_security,
 160                                     DATA_BLOB blob, size_t *size)
 161 {
 162         if (gensec_security->ops->packet_full_request) {
 163                 return gensec_security->ops->packet_full_request(gensec_security,
 164                                                                  blob, size);
 165         }
 166         if (gensec_security->ops->unwrap_packets) {
 167                 if (blob.length) {
 168                         *size = blob.length;
 169                         return NT_STATUS_OK;
 170                 }
 171                 return STATUS_MORE_ENTRIES;
 172         }
 173
 174         if (blob.length < 4) {
 175                 return STATUS_MORE_ENTRIES;
 176         }
 177         *size = 4 + RIVAL(blob.data, 0);
 178         if (*size > blob.length) {
 179                 return STATUS_MORE_ENTRIES;
 180         }
 181         return NT_STATUS_OK;
 182 }