lib/gssapi/ntlm/accept_sec_context.c

   1 /*
   2  * Copyright (c) 2006 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "ntlm.h"
  35
  36 /*
  37  *
  38  */
  39
  40 OM_uint32
  41 _gss_ntlm_allocate_ctx(OM_uint32 *minor_status, ntlm_ctx *ctx)
  42 {
  43     OM_uint32 maj_stat;
  44     struct ntlm_server_interface *ns_interface = NULL;
  45
  46 #ifdef DIGEST
  47     ns_interface = &ntlmsspi_kdc_digest;
  48 #endif
  49     if (ns_interface == NULL)
  50         return GSS_S_FAILURE;
  51
  52     *ctx = calloc(1, sizeof(**ctx));
  53
  54     (*ctx)->server = ns_interface;
  55
  56     maj_stat = (*(*ctx)->server->nsi_init)(minor_status, &(*ctx)->ictx);
  57     if (maj_stat != GSS_S_COMPLETE)
  58         return maj_stat;
  59
  60     return GSS_S_COMPLETE;
  61 }
  62
  63 /*
  64  *
  65  */
  66
  67 OM_uint32 GSSAPI_CALLCONV
  68 _gss_ntlm_accept_sec_context
  69 (OM_uint32 * minor_status,
  70  gss_ctx_id_t * context_handle,
  71  gss_const_cred_id_t acceptor_cred_handle,
  72  const gss_buffer_t input_token_buffer,
  73  const gss_channel_bindings_t input_chan_bindings,
  74  gss_name_t * src_name,
  75  gss_OID * mech_type,
  76  gss_buffer_t output_token,
  77  OM_uint32 * ret_flags,
  78  OM_uint32 * time_rec,
  79  gss_cred_id_t * delegated_cred_handle
  80     )
  81 {
  82     krb5_error_code ret;
  83     struct ntlm_buf data;
  84     OM_uint32 junk;
  85     ntlm_ctx ctx;
  86
  87     output_token->value = NULL;
  88     output_token->length = 0;
  89
  90     *minor_status = 0;
  91
  92     if (context_handle == NULL)
  93         return GSS_S_FAILURE;
  94
  95     if (input_token_buffer == GSS_C_NO_BUFFER)
  96         return GSS_S_FAILURE;
  97
  98     if (src_name)
  99         *src_name = GSS_C_NO_NAME;
 100     if (mech_type)
 101         *mech_type = GSS_C_NO_OID;
 102     if (ret_flags)
 103         *ret_flags = 0;
 104     if (time_rec)
 105         *time_rec = 0;
 106     if (delegated_cred_handle)
 107         *delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 108
 109     if (*context_handle == GSS_C_NO_CONTEXT) {
 110         struct ntlm_type1 type1;
 111         OM_uint32 major_status;
 112         OM_uint32 retflags;
 113         struct ntlm_buf out;
 114
 115         major_status = _gss_ntlm_allocate_ctx(minor_status, &ctx);
 116         if (major_status)
 117             return major_status;
 118         *context_handle = (gss_ctx_id_t)ctx;
 119
 120         /* check if the mechs is allowed by remote service */
 121         major_status = (*ctx->server->nsi_probe)(minor_status, ctx->ictx, NULL);
 122         if (major_status) {
 123             _gss_ntlm_delete_sec_context(minor_status, context_handle, NULL);
 124             return major_status;
 125         }
 126
 127         data.data = input_token_buffer->value;
 128         data.length = input_token_buffer->length;
 129
 130         ret = heim_ntlm_decode_type1(&data, &type1);
 131         if (ret) {
 132             _gss_ntlm_delete_sec_context(minor_status, context_handle, NULL);
 133             *minor_status = ret;
 134             return GSS_S_FAILURE;
 135         }
 136
 137         if ((type1.flags & NTLM_NEG_UNICODE) == 0) {
 138             heim_ntlm_free_type1(&type1);
 139             _gss_ntlm_delete_sec_context(minor_status, context_handle, NULL);
 140             *minor_status = EINVAL;
 141             return GSS_S_FAILURE;
 142         }
 143
 144         if (type1.flags & NTLM_NEG_SIGN)
 145             ctx->gssflags |= GSS_C_CONF_FLAG;
 146         if (type1.flags & NTLM_NEG_SIGN)
 147             ctx->gssflags |= GSS_C_INTEG_FLAG;
 148
 149         major_status = (*ctx->server->nsi_type2)(minor_status,
 150                                                  ctx->ictx,
 151                                                  type1.flags,
 152                                                  type1.hostname,
 153                                                  type1.domain,
 154                                                  &retflags,
 155                                                  &out);
 156         heim_ntlm_free_type1(&type1);
 157         if (major_status != GSS_S_COMPLETE) {
 158             OM_uint32 gunk;
 159             _gss_ntlm_delete_sec_context(&gunk, context_handle, NULL);
 160             return major_status;
 161         }
 162
 163         output_token->value = malloc(out.length);
 164         if (output_token->value == NULL && out.length != 0) {
 165             OM_uint32 gunk;
 166             _gss_ntlm_delete_sec_context(&gunk, context_handle, NULL);
 167             *minor_status = ENOMEM;
 168             return GSS_S_FAILURE;
 169         }
 170         memcpy(output_token->value, out.data, out.length);
 171         output_token->length = out.length;
 172
 173         ctx->flags = retflags;
 174
 175         return GSS_S_CONTINUE_NEEDED;
 176     } else {
 177         OM_uint32 maj_stat;
 178         struct ntlm_type3 type3;
 179         struct ntlm_buf session;
 180
 181         ctx = (ntlm_ctx)*context_handle;
 182
 183         data.data = input_token_buffer->value;
 184         data.length = input_token_buffer->length;
 185
 186         ret = heim_ntlm_decode_type3(&data, 1, &type3);
 187         if (ret) {
 188             _gss_ntlm_delete_sec_context(minor_status, context_handle, NULL);
 189             *minor_status = ret;
 190             return GSS_S_FAILURE;
 191         }
 192
 193         maj_stat = (*ctx->server->nsi_type3)(minor_status,
 194                                              ctx->ictx,
 195                                              &type3,
 196                                              &session);
 197         if (maj_stat) {
 198             heim_ntlm_free_type3(&type3);
 199             _gss_ntlm_delete_sec_context(minor_status, context_handle, NULL);
 200             return maj_stat;
 201         }
 202
 203         if (src_name) {
 204             ntlm_name n = calloc(1, sizeof(*n));
 205             if (n) {
 206                 n->user = strdup(type3.username);
 207                 n->domain = strdup(type3.targetname);
 208             }
 209             if (n == NULL || n->user == NULL || n->domain == NULL) {
 210                 gss_name_t tempn =  (gss_name_t)n;
 211                 _gss_ntlm_release_name(&junk, &tempn);
 212                 heim_ntlm_free_type3(&type3);
 213                 _gss_ntlm_delete_sec_context(minor_status,
 214                                              context_handle, NULL);
 215                 return maj_stat;
 216             }
 217             *src_name = (gss_name_t)n;
 218         }
 219
 220         heim_ntlm_free_type3(&type3);
 221
 222         ret = krb5_data_copy(&ctx->sessionkey,
 223                              session.data, session.length);
 224         if (ret) {
 225             if (src_name)
 226                 _gss_ntlm_release_name(&junk, src_name);
 227             _gss_ntlm_delete_sec_context(minor_status, context_handle, NULL);
 228             *minor_status = ret;
 229             return GSS_S_FAILURE;
 230         }
 231
 232         if (session.length != 0) {
 233
 234             ctx->status |= STATUS_SESSIONKEY;
 235
 236             if (ctx->flags & NTLM_NEG_NTLM2_SESSION) {
 237                 _gss_ntlm_set_key(&ctx->u.v2.send, 1,
 238                                   (ctx->flags & NTLM_NEG_KEYEX),
 239                                   ctx->sessionkey.data,
 240                                   ctx->sessionkey.length);
 241                 _gss_ntlm_set_key(&ctx->u.v2.recv, 0,
 242                                   (ctx->flags & NTLM_NEG_KEYEX),
 243                                   ctx->sessionkey.data,
 244                                   ctx->sessionkey.length);
 245             } else {
 246                 RC4_set_key(&ctx->u.v1.crypto_send.key,
 247                             ctx->sessionkey.length,
 248                             ctx->sessionkey.data);
 249                 RC4_set_key(&ctx->u.v1.crypto_recv.key,
 250                             ctx->sessionkey.length,
 251                             ctx->sessionkey.data);
 252             }
 253         }
 254
 255         if (mech_type)
 256             *mech_type = GSS_NTLM_MECHANISM;
 257         if (time_rec)
 258             *time_rec = GSS_C_INDEFINITE;
 259
 260         ctx->status |= STATUS_OPEN;
 261
 262         if (ret_flags)
 263             *ret_flags = ctx->gssflags;
 264
 265         return GSS_S_COMPLETE;
 266     }
 267 }