src/core/sip-sec-sspi.c

   1 /**
   2  * @file sip-sec-sspi.c
   3  *
   4  * pidgin-sipe
   5  *
   6  * Copyright (C) 2009 pier11 <pier11@operamail.com>
   7  *
   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 2 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, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24 #include <stdio.h>
  25 #include <windows.h>
  26 #include <rpc.h>
  27 #include <security.h>
  28
  29 #include <glib.h>
  30
  31 #include "sip-sec.h"
  32 #include "sip-sec-mech.h"
  33 #include "sip-sec-sspi.h"
  34 #include "sipe-backend.h"
  35
  36 /* Mechanism names */
  37 #define SSPI_MECH_NTLM      "NTLM"
  38 #define SSPI_MECH_KERBEROS  "Kerberos"
  39 #define SSPI_MECH_NEGOTIATE "Negotiate"
  40
  41 #define ISC_REQ_IDENTIFY               0x00002000
  42
  43 typedef struct _context_sspi {
  44         struct sip_sec_context common;
  45         CredHandle* cred_sspi;
  46         CtxtHandle* ctx_sspi;
  47         /** Kerberos or NTLM */
  48         const char *mech;
  49 } *context_sspi;
  50
  51 static int
  52 sip_sec_get_interval_from_now_sec(TimeStamp timestamp);
  53
  54 void
  55 sip_sec_sspi_print_error(const char *func,
  56                          SECURITY_STATUS ret);
  57
  58 /** internal method */
  59 static void
  60 sip_sec_destroy_sspi_context(context_sspi context)
  61 {
  62         if (context->ctx_sspi)
  63                 DeleteSecurityContext(context->ctx_sspi);
  64         if (context->cred_sspi)
  65                 FreeCredentialsHandle(context->cred_sspi);
  66 }
  67
  68 /* sip-sec-mech.h API implementation for SSPI - Kerberos and NTLM */
  69
  70 static sip_uint32
  71 sip_sec_acquire_cred__sspi(SipSecContext context,
  72                            const char *domain,
  73                            const char *username,
  74                            const char *password)
  75 {
  76         SECURITY_STATUS ret;
  77         TimeStamp expiry;
  78         SEC_WINNT_AUTH_IDENTITY auth_identity;
  79         context_sspi ctx = (context_sspi)context;
  80         CredHandle *cred_handle;
  81
  82         if (username) {
  83                 if (!password) {
  84                         return SIP_SEC_E_INTERNAL_ERROR;
  85                 }
  86
  87                 memset(&auth_identity, 0, sizeof(auth_identity));
  88                 auth_identity.Flags = SEC_WINNT_AUTH_IDENTITY_ANSI;
  89
  90                 if ( domain && (strlen(domain) > 0) ) {
  91                         auth_identity.Domain = (unsigned char*)domain;
  92                         auth_identity.DomainLength = strlen(domain);
  93                 }
  94
  95                 auth_identity.User = (unsigned char*)username;
  96                 auth_identity.UserLength = strlen(username);
  97
  98                 auth_identity.Password = (unsigned char*)password;
  99                 auth_identity.PasswordLength = strlen(password);
 100         }
 101
 102         cred_handle = g_malloc0(sizeof(CredHandle));
 103
 104         ret = AcquireCredentialsHandle( NULL,
 105                                         (SEC_CHAR *)ctx->mech,
 106                                         SECPKG_CRED_OUTBOUND,
 107                                         NULL,
 108                                         (context->sso || !username) ? NULL : &auth_identity,
 109                                         NULL,
 110                                         NULL,
 111                                         cred_handle,
 112                                         &expiry
 113                                         );
 114
 115         if (ret != SEC_E_OK) {
 116                 sip_sec_sspi_print_error("sip_sec_acquire_cred__sspi: AcquireCredentialsHandle", ret);
 117                 ctx->cred_sspi = NULL;
 118                 return SIP_SEC_E_INTERNAL_ERROR;
 119         } else {
 120                 ctx->cred_sspi = cred_handle;
 121                 return SIP_SEC_E_OK;
 122         }
 123 }
 124
 125 static sip_uint32
 126 sip_sec_init_sec_context__sspi(SipSecContext context,
 127                                SipSecBuffer in_buff,
 128                                SipSecBuffer *out_buff,
 129                                const char *service_name)
 130 {
 131         TimeStamp expiry;
 132         SecBufferDesc input_desc, output_desc;
 133         SecBuffer in_token, out_token;
 134         SECURITY_STATUS ret;
 135         ULONG req_flags;
 136         ULONG ret_flags;
 137         context_sspi ctx = (context_sspi)context;
 138         CtxtHandle* out_context = g_malloc0(sizeof(CtxtHandle));
 139
 140         SIPE_DEBUG_INFO_NOFORMAT("sip_sec_init_sec_context__sspi: in use");
 141
 142         input_desc.cBuffers = 1;
 143         input_desc.pBuffers = &in_token;
 144         input_desc.ulVersion = SECBUFFER_VERSION;
 145
 146         /* input token */
 147         in_token.BufferType = SECBUFFER_TOKEN;
 148         in_token.cbBuffer = in_buff.length;
 149         in_token.pvBuffer = in_buff.value;
 150
 151         output_desc.cBuffers = 1;
 152         output_desc.pBuffers = &out_token;
 153         output_desc.ulVersion = SECBUFFER_VERSION;
 154
 155         /* to hold output token */
 156         out_token.BufferType = SECBUFFER_TOKEN;
 157         out_token.cbBuffer = 0;
 158         out_token.pvBuffer = NULL;
 159
 160         req_flags = (ISC_REQ_ALLOCATE_MEMORY |
 161                      ISC_REQ_INTEGRITY |
 162                      ISC_REQ_IDENTIFY);
 163
 164         if (ctx->mech && !strcmp(ctx->mech, SSPI_MECH_NTLM) &&
 165             !context->is_connection_based)
 166         {
 167                 req_flags |= (ISC_REQ_DATAGRAM);
 168         }
 169
 170         ret = InitializeSecurityContext(ctx->cred_sspi,
 171                                         ctx->ctx_sspi,
 172                                         (SEC_CHAR *)service_name,
 173                                         req_flags,
 174                                         0,
 175                                         SECURITY_NATIVE_DREP,
 176                                         &input_desc,
 177                                         0,
 178                                         out_context,
 179                                         &output_desc,
 180                                         &ret_flags,
 181                                         &expiry
 182                                         );
 183
 184         if (ret != SEC_E_OK && ret != SEC_I_CONTINUE_NEEDED) {
 185                 sip_sec_destroy_sspi_context(ctx);
 186                 sip_sec_sspi_print_error("sip_sec_init_sec_context__sspi: InitializeSecurityContext", ret);
 187                 return SIP_SEC_E_INTERNAL_ERROR;
 188         }
 189
 190         out_buff->length = out_token.cbBuffer;
 191         out_buff->value = NULL;
 192         if (out_token.cbBuffer) {
 193                 out_buff->value = g_malloc0(out_token.cbBuffer);
 194                 memmove(out_buff->value, out_token.pvBuffer, out_token.cbBuffer);
 195                 FreeContextBuffer(out_token.pvBuffer);
 196         }
 197
 198         ctx->ctx_sspi = out_context;
 199         if (ctx->mech && !strcmp(ctx->mech, SSPI_MECH_KERBEROS)) {
 200                 context->expires = sip_sec_get_interval_from_now_sec(expiry);
 201         }
 202
 203         if (ret == SEC_I_CONTINUE_NEEDED) {
 204                 return SIP_SEC_I_CONTINUE_NEEDED;
 205         } else  {
 206                 return SIP_SEC_E_OK;
 207         }
 208 }
 209
 210 static void
 211 sip_sec_destroy_sec_context__sspi(SipSecContext context)
 212 {
 213         sip_sec_destroy_sspi_context((context_sspi)context);
 214         g_free(context);
 215 }
 216
 217 /**
 218  * @param message a NULL terminated string to sign
 219  *
 220  */
 221 static sip_uint32
 222 sip_sec_make_signature__sspi(SipSecContext context,
 223                              const char *message,
 224                              SipSecBuffer *signature)
 225 {
 226         SecBufferDesc buffs_desc;
 227         SecBuffer buffs[2];
 228         SECURITY_STATUS ret;
 229         SecPkgContext_Sizes context_sizes;
 230         unsigned char *signature_buff;
 231         size_t signature_buff_length;
 232         context_sspi ctx = (context_sspi) context;
 233
 234         ret = QueryContextAttributes(ctx->ctx_sspi,
 235                                         SECPKG_ATTR_SIZES,
 236                                         &context_sizes);
 237
 238         if (ret != SEC_E_OK) {
 239                 sip_sec_sspi_print_error("sip_sec_make_signature__sspi: QueryContextAttributes", ret);
 240                 return SIP_SEC_E_INTERNAL_ERROR;
 241         }
 242
 243         signature_buff_length = context_sizes.cbMaxSignature;
 244         signature_buff = g_malloc0(signature_buff_length);
 245
 246         buffs_desc.cBuffers = 2;
 247         buffs_desc.pBuffers = buffs;
 248         buffs_desc.ulVersion = SECBUFFER_VERSION;
 249
 250         /* message to sign */
 251         buffs[0].BufferType = SECBUFFER_DATA;
 252         buffs[0].cbBuffer = strlen(message);
 253         buffs[0].pvBuffer = (PVOID)message;
 254
 255         /* to hold signature */
 256         buffs[1].BufferType = SECBUFFER_TOKEN;
 257         buffs[1].cbBuffer = signature_buff_length;
 258         buffs[1].pvBuffer = signature_buff;
 259
 260         ret = MakeSignature(ctx->ctx_sspi,
 261                             (ULONG)0,
 262                             &buffs_desc,
 263                             100);
 264         if (ret != SEC_E_OK) {
 265                 sip_sec_sspi_print_error("sip_sec_make_signature__sspi: MakeSignature", ret);
 266                 g_free(signature_buff);
 267                 return SIP_SEC_E_INTERNAL_ERROR;
 268         }
 269
 270         signature->value = signature_buff;
 271         signature->length = buffs[1].cbBuffer;
 272
 273         return SIP_SEC_E_OK;
 274 }
 275
 276 /**
 277  * @param message a NULL terminated string to check signature of
 278  * @return SIP_SEC_E_OK on success
 279  */
 280 static sip_uint32
 281 sip_sec_verify_signature__sspi(SipSecContext context,
 282                                const char *message,
 283                                SipSecBuffer signature)
 284 {
 285         SecBufferDesc buffs_desc;
 286         SecBuffer buffs[2];
 287         SECURITY_STATUS ret;
 288
 289         buffs_desc.cBuffers = 2;
 290         buffs_desc.pBuffers = buffs;
 291         buffs_desc.ulVersion = SECBUFFER_VERSION;
 292
 293         /* message to sign */
 294         buffs[0].BufferType = SECBUFFER_DATA;
 295         buffs[0].cbBuffer = strlen(message);
 296         buffs[0].pvBuffer = (PVOID)message;
 297
 298         /* signature to check */
 299         buffs[1].BufferType = SECBUFFER_TOKEN;
 300         buffs[1].cbBuffer = signature.length;
 301         buffs[1].pvBuffer = signature.value;
 302
 303         ret = VerifySignature(((context_sspi)context)->ctx_sspi,
 304                               &buffs_desc,
 305                               0,
 306                               0);
 307
 308         if (ret != SEC_E_OK) {
 309                 sip_sec_sspi_print_error("sip_sec_verify_signature__sspi: VerifySignature", ret);
 310                 return SIP_SEC_E_INTERNAL_ERROR;
 311         }
 312
 313         return SIP_SEC_E_OK;
 314 }
 315
 316 SipSecContext
 317 sip_sec_create_context__sspi(guint type)
 318 {
 319         context_sspi context = g_malloc0(sizeof(struct _context_sspi));
 320         if (!context) return(NULL);
 321
 322         context->common.acquire_cred_func     = sip_sec_acquire_cred__sspi;
 323         context->common.init_context_func     = sip_sec_init_sec_context__sspi;
 324         context->common.destroy_context_func  = sip_sec_destroy_sec_context__sspi;
 325         context->common.make_signature_func   = sip_sec_make_signature__sspi;
 326         context->common.verify_signature_func = sip_sec_verify_signature__sspi;
 327         context->mech = (type == AUTH_TYPE_NTLM) ? SSPI_MECH_NTLM :
 328                         ((type == AUTH_TYPE_KERBEROS) ? SSPI_MECH_KERBEROS : SSPI_MECH_NEGOTIATE);
 329
 330         return((SipSecContext) context);
 331 }
 332
 333 /* Utility Functions */
 334
 335 /**
 336  * Returns interval in seconds from now till provided value
 337  */
 338 static int
 339 sip_sec_get_interval_from_now_sec(TimeStamp timestamp)
 340 {
 341         SYSTEMTIME stNow;
 342         FILETIME ftNow;
 343         ULARGE_INTEGER uliNow, uliTo;
 344
 345         GetLocalTime(&stNow);
 346         SystemTimeToFileTime(&stNow, &ftNow);
 347
 348         uliNow.LowPart = ftNow.dwLowDateTime;
 349         uliNow.HighPart = ftNow.dwHighDateTime;
 350
 351         uliTo.LowPart = timestamp.LowPart;
 352         uliTo.HighPart = timestamp.HighPart;
 353
 354         return (int)((uliTo.QuadPart - uliNow.QuadPart)/10/1000/1000);
 355 }
 356
 357 void
 358 sip_sec_sspi_print_error(const char *func,
 359                          SECURITY_STATUS ret)
 360 {
 361         char *error_message;
 362         static char *buff;
 363         int buff_length;
 364
 365         buff_length = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM |
 366                                     FORMAT_MESSAGE_ALLOCATE_BUFFER |
 367                                     FORMAT_MESSAGE_IGNORE_INSERTS,
 368                                     0,
 369                                     ret,
 370                                     0,
 371                                     (LPTSTR)&buff,
 372                                     16384,
 373                                     0);
 374         error_message = g_strndup(buff, buff_length);
 375         LocalFree(buff);
 376
 377         printf("SSPI ERROR [%d] in %s: %s", (int)ret, func, error_message);
 378         g_free(error_message);
 379 }
 380
 381
 382 /*
 383   Local Variables:
 384   mode: c
 385   c-file-style: "bsd"
 386   indent-tabs-mode: t
 387   tab-width: 8
 388   End:
 389 */