src/core/sip-sec-sspi.c

   1 /**
   2  * @file sip-sec-sspi.c
   3  *
   4  * pidgin-sipe
   5  *
   6  * Copyright (C) 2011-12 SIPE Project <http://sipe.sourceforge.net/>
   7  * Copyright (C) 2009 pier11 <pier11@operamail.com>
   8  *
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24
  25 #include <stdio.h>
  26 #include <windows.h>
  27 #include <rpc.h>
  28 #ifndef SECURITY_WIN32
  29 #define SECURITY_WIN32 1
  30 #endif
  31 #include <security.h>
  32
  33 #include <glib.h>
  34
  35 #include "sip-sec.h"
  36 #include "sip-sec-mech.h"
  37 #include "sip-sec-sspi.h"
  38 #include "sipe-backend.h"
  39 #include "sipe-core.h"
  40
  41 /* Mechanism names */
  42 #define SSPI_MECH_NTLM      "NTLM"
  43 #define SSPI_MECH_KERBEROS  "Kerberos"
  44 #define SSPI_MECH_NEGOTIATE "Negotiate"
  45 #define SSPI_MECH_TLS_DSK   "Schannel" /* SSL/TLS provider, is this correct? */
  46
  47 #ifndef ISC_REQ_IDENTIFY
  48 #define ISC_REQ_IDENTIFY               0x00002000
  49 #endif
  50
  51 typedef struct _context_sspi {
  52         struct sip_sec_context common;
  53         CredHandle* cred_sspi;
  54         CtxtHandle* ctx_sspi;
  55         /** Kerberos or NTLM */
  56         const char *mech;
  57 } *context_sspi;
  58
  59 static int
  60 sip_sec_get_interval_from_now_sec(TimeStamp timestamp);
  61
  62 void
  63 sip_sec_sspi_print_error(const char *func,
  64                          SECURITY_STATUS ret);
  65
  66 /** internal method */
  67 static void
  68 sip_sec_destroy_sspi_context(context_sspi context)
  69 {
  70         if (context->ctx_sspi)
  71                 DeleteSecurityContext(context->ctx_sspi);
  72         if (context->cred_sspi)
  73                 FreeCredentialsHandle(context->cred_sspi);
  74 }
  75
  76 /* sip-sec-mech.h API implementation for SSPI - Kerberos and NTLM */
  77
  78 static sip_uint32
  79 sip_sec_acquire_cred__sspi(SipSecContext context,
  80                            const char *domain,
  81                            const char *username,
  82                            const char *password)
  83 {
  84         SECURITY_STATUS ret;
  85         TimeStamp expiry;
  86         SEC_WINNT_AUTH_IDENTITY auth_identity;
  87         context_sspi ctx = (context_sspi)context;
  88
  89         if (username) {
  90                 if (!password) {
  91                         return SIP_SEC_E_INTERNAL_ERROR;
  92                 }
  93
  94                 memset(&auth_identity, 0, sizeof(auth_identity));
  95                 auth_identity.Flags = SEC_WINNT_AUTH_IDENTITY_ANSI;
  96
  97                 if ( domain && (strlen(domain) > 0) ) {
  98                         auth_identity.Domain = (unsigned char*)domain;
  99                         auth_identity.DomainLength = strlen(domain);
 100                 }
 101
 102                 auth_identity.User = (unsigned char*)username;
 103                 auth_identity.UserLength = strlen(username);
 104
 105                 auth_identity.Password = (unsigned char*)password;
 106                 auth_identity.PasswordLength = strlen(password);
 107         }
 108
 109         ctx->cred_sspi = g_malloc0(sizeof(CredHandle));
 110
 111         /* @TODO: this does not work for "Schannel" (TLS-DSK) as it expects
 112                   a SCHANNEL_CRED datastructure, pointing to the private key
 113                   and the client certificate */
 114         ret = AcquireCredentialsHandleA(NULL,
 115                                         (SEC_CHAR *)ctx->mech,
 116                                         SECPKG_CRED_OUTBOUND,
 117                                         NULL,
 118                                         (context->sso || !username) ? NULL : &auth_identity,
 119                                         NULL,
 120                                         NULL,
 121                                         ctx->cred_sspi,
 122                                         &expiry);
 123
 124         if (ret != SEC_E_OK) {
 125                 sip_sec_sspi_print_error("sip_sec_acquire_cred__sspi: AcquireCredentialsHandleA", ret);
 126                 g_free(ctx->cred_sspi);
 127                 ctx->cred_sspi = NULL;
 128                 return SIP_SEC_E_INTERNAL_ERROR;
 129         } else {
 130                 return SIP_SEC_E_OK;
 131         }
 132 }
 133
 134 static sip_uint32
 135 sip_sec_init_sec_context__sspi(SipSecContext context,
 136                                SipSecBuffer in_buff,
 137                                SipSecBuffer *out_buff,
 138                                const char *service_name)
 139 {
 140         TimeStamp expiry;
 141         SecBufferDesc input_desc, output_desc;
 142         SecBuffer in_token, out_token;
 143         SECURITY_STATUS ret;
 144         ULONG req_flags;
 145         ULONG ret_flags;
 146         context_sspi ctx = (context_sspi)context;
 147         CtxtHandle* out_context = g_malloc0(sizeof(CtxtHandle));
 148
 149         SIPE_DEBUG_INFO_NOFORMAT("sip_sec_init_sec_context__sspi: in use");
 150
 151         input_desc.cBuffers = 1;
 152         input_desc.pBuffers = &in_token;
 153         input_desc.ulVersion = SECBUFFER_VERSION;
 154
 155         /* input token */
 156         in_token.BufferType = SECBUFFER_TOKEN;
 157         in_token.cbBuffer = in_buff.length;
 158         in_token.pvBuffer = in_buff.value;
 159
 160         output_desc.cBuffers = 1;
 161         output_desc.pBuffers = &out_token;
 162         output_desc.ulVersion = SECBUFFER_VERSION;
 163
 164         /* to hold output token */
 165         out_token.BufferType = SECBUFFER_TOKEN;
 166         out_token.cbBuffer = 0;
 167         out_token.pvBuffer = NULL;
 168
 169         req_flags = (ISC_REQ_ALLOCATE_MEMORY |
 170                      ISC_REQ_INTEGRITY |
 171                      ISC_REQ_IDENTIFY);
 172
 173         if (ctx->mech && !strcmp(ctx->mech, SSPI_MECH_NTLM) &&
 174             !context->is_connection_based)
 175         {
 176                 req_flags |= (ISC_REQ_DATAGRAM);
 177         }
 178
 179         ret = InitializeSecurityContextA(ctx->cred_sspi,
 180                                          ctx->ctx_sspi,
 181                                          (SEC_CHAR *)service_name,
 182                                          req_flags,
 183                                          0,
 184                                          SECURITY_NATIVE_DREP,
 185                                          &input_desc,
 186                                          0,
 187                                          out_context,
 188                                          &output_desc,
 189                                          &ret_flags,
 190                                          &expiry);
 191
 192         if (ret != SEC_E_OK && ret != SEC_I_CONTINUE_NEEDED) {
 193                 sip_sec_destroy_sspi_context(ctx);
 194                 sip_sec_sspi_print_error("sip_sec_init_sec_context__sspi: InitializeSecurityContextA", ret);
 195                 return SIP_SEC_E_INTERNAL_ERROR;
 196         }
 197
 198         out_buff->length = out_token.cbBuffer;
 199         out_buff->value = NULL;
 200         if (out_token.cbBuffer) {
 201                 out_buff->value = g_malloc0(out_token.cbBuffer);
 202                 memmove(out_buff->value, out_token.pvBuffer, out_token.cbBuffer);
 203                 FreeContextBuffer(out_token.pvBuffer);
 204         }
 205
 206         ctx->ctx_sspi = out_context;
 207         if (ctx->mech && !strcmp(ctx->mech, SSPI_MECH_KERBEROS)) {
 208                 context->expires = sip_sec_get_interval_from_now_sec(expiry);
 209         }
 210
 211         if (ret == SEC_I_CONTINUE_NEEDED) {
 212                 return SIP_SEC_I_CONTINUE_NEEDED;
 213         } else  {
 214                 return SIP_SEC_E_OK;
 215         }
 216 }
 217
 218 static void
 219 sip_sec_destroy_sec_context__sspi(SipSecContext context)
 220 {
 221         sip_sec_destroy_sspi_context((context_sspi)context);
 222         g_free(context);
 223 }
 224
 225 /**
 226  * @param message a NULL terminated string to sign
 227  *
 228  */
 229 static sip_uint32
 230 sip_sec_make_signature__sspi(SipSecContext context,
 231                              const char *message,
 232                              SipSecBuffer *signature)
 233 {
 234         SecBufferDesc buffs_desc;
 235         SecBuffer buffs[2];
 236         SECURITY_STATUS ret;
 237         SecPkgContext_Sizes context_sizes;
 238         unsigned char *signature_buff;
 239         size_t signature_buff_length;
 240         context_sspi ctx = (context_sspi) context;
 241
 242         ret = QueryContextAttributes(ctx->ctx_sspi,
 243                                         SECPKG_ATTR_SIZES,
 244                                         &context_sizes);
 245
 246         if (ret != SEC_E_OK) {
 247                 sip_sec_sspi_print_error("sip_sec_make_signature__sspi: QueryContextAttributes", ret);
 248                 return SIP_SEC_E_INTERNAL_ERROR;
 249         }
 250
 251         signature_buff_length = context_sizes.cbMaxSignature;
 252         signature_buff = g_malloc0(signature_buff_length);
 253
 254         buffs_desc.cBuffers = 2;
 255         buffs_desc.pBuffers = buffs;
 256         buffs_desc.ulVersion = SECBUFFER_VERSION;
 257
 258         /* message to sign */
 259         buffs[0].BufferType = SECBUFFER_DATA;
 260         buffs[0].cbBuffer = strlen(message);
 261         buffs[0].pvBuffer = (PVOID)message;
 262
 263         /* to hold signature */
 264         buffs[1].BufferType = SECBUFFER_TOKEN;
 265         buffs[1].cbBuffer = signature_buff_length;
 266         buffs[1].pvBuffer = signature_buff;
 267
 268         ret = MakeSignature(ctx->ctx_sspi,
 269                             (ULONG)0,
 270                             &buffs_desc,
 271                             100);
 272         if (ret != SEC_E_OK) {
 273                 sip_sec_sspi_print_error("sip_sec_make_signature__sspi: MakeSignature", ret);
 274                 g_free(signature_buff);
 275                 return SIP_SEC_E_INTERNAL_ERROR;
 276         }
 277
 278         signature->value = signature_buff;
 279         signature->length = buffs[1].cbBuffer;
 280
 281         return SIP_SEC_E_OK;
 282 }
 283
 284 /**
 285  * @param message a NULL terminated string to check signature of
 286  * @return SIP_SEC_E_OK on success
 287  */
 288 static sip_uint32
 289 sip_sec_verify_signature__sspi(SipSecContext context,
 290                                const char *message,
 291                                SipSecBuffer signature)
 292 {
 293         SecBufferDesc buffs_desc;
 294         SecBuffer buffs[2];
 295         SECURITY_STATUS ret;
 296
 297         buffs_desc.cBuffers = 2;
 298         buffs_desc.pBuffers = buffs;
 299         buffs_desc.ulVersion = SECBUFFER_VERSION;
 300
 301         /* message to sign */
 302         buffs[0].BufferType = SECBUFFER_DATA;
 303         buffs[0].cbBuffer = strlen(message);
 304         buffs[0].pvBuffer = (PVOID)message;
 305
 306         /* signature to check */
 307         buffs[1].BufferType = SECBUFFER_TOKEN;
 308         buffs[1].cbBuffer = signature.length;
 309         buffs[1].pvBuffer = signature.value;
 310
 311         ret = VerifySignature(((context_sspi)context)->ctx_sspi,
 312                               &buffs_desc,
 313                               0,
 314                               0);
 315
 316         if (ret != SEC_E_OK) {
 317                 sip_sec_sspi_print_error("sip_sec_verify_signature__sspi: VerifySignature", ret);
 318                 return SIP_SEC_E_INTERNAL_ERROR;
 319         }
 320
 321         return SIP_SEC_E_OK;
 322 }
 323
 324 SipSecContext
 325 sip_sec_create_context__sspi(guint type)
 326 {
 327         context_sspi context = g_malloc0(sizeof(struct _context_sspi));
 328         if (!context) return(NULL);
 329
 330         context->common.acquire_cred_func     = sip_sec_acquire_cred__sspi;
 331         context->common.init_context_func     = sip_sec_init_sec_context__sspi;
 332         context->common.destroy_context_func  = sip_sec_destroy_sec_context__sspi;
 333         context->common.make_signature_func   = sip_sec_make_signature__sspi;
 334         context->common.verify_signature_func = sip_sec_verify_signature__sspi;
 335         context->mech = (type == SIPE_AUTHENTICATION_TYPE_NTLM) ? SSPI_MECH_NTLM :
 336                         ((type == SIPE_AUTHENTICATION_TYPE_KERBEROS) ? SSPI_MECH_KERBEROS :
 337                          ((type == SIPE_AUTHENTICATION_TYPE_NEGOTIATE) ? SSPI_MECH_NEGOTIATE : SSPI_MECH_TLS_DSK));
 338
 339         return((SipSecContext) context);
 340 }
 341
 342 gboolean sip_sec_password__sspi(void)
 343 {
 344         /* SSPI supports Single-Sign On */
 345         return(FALSE);
 346 }
 347
 348 /* Utility Functions */
 349
 350 /**
 351  * Returns interval in seconds from now till provided value
 352  */
 353 static int
 354 sip_sec_get_interval_from_now_sec(TimeStamp timestamp)
 355 {
 356         SYSTEMTIME stNow;
 357         FILETIME ftNow;
 358         ULARGE_INTEGER uliNow, uliTo;
 359
 360         GetLocalTime(&stNow);
 361         SystemTimeToFileTime(&stNow, &ftNow);
 362
 363         uliNow.LowPart = ftNow.dwLowDateTime;
 364         uliNow.HighPart = ftNow.dwHighDateTime;
 365
 366         uliTo.LowPart = timestamp.LowPart;
 367         uliTo.HighPart = timestamp.HighPart;
 368
 369         return (int)((uliTo.QuadPart - uliNow.QuadPart)/10/1000/1000);
 370 }
 371
 372 void
 373 sip_sec_sspi_print_error(const char *func,
 374                          SECURITY_STATUS ret)
 375 {
 376         char *error_message;
 377         static char *buff;
 378         int buff_length;
 379
 380         buff_length = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM |
 381                                     FORMAT_MESSAGE_ALLOCATE_BUFFER |
 382                                     FORMAT_MESSAGE_IGNORE_INSERTS,
 383                                     0,
 384                                     ret,
 385                                     0,
 386                                     (LPTSTR)&buff,
 387                                     16384,
 388                                     0);
 389         error_message = g_strndup(buff, buff_length);
 390         LocalFree(buff);
 391
 392         printf("SSPI ERROR [%d] in %s: %s", (int)ret, func, error_message);
 393         g_free(error_message);
 394 }
 395
 396
 397 /*
 398   Local Variables:
 399   mode: c
 400   c-file-style: "bsd"
 401   indent-tabs-mode: t
 402   tab-width: 8
 403   End:
 404 */