src/core/sip-sec-sspi.c

   1 /**
   2  * @file sip-sec-sspi.c
   3  *
   4  * pidgin-sipe
   5  *
   6  * Copyright (C) 2011 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 #ifdef HAVE_CONFIG_H
  29 /* This should not affect Makefile.mingw builds, as it doesn't use config.h */
  30 #ifndef SECURITY_WIN32
  31 #define SECURITY_WIN32 1
  32 #endif
  33 #endif
  34 #include <security.h>
  35
  36 #include <glib.h>
  37
  38 #include "sip-sec.h"
  39 #include "sip-sec-mech.h"
  40 #include "sip-sec-sspi.h"
  41 #include "sipe-backend.h"
  42
  43 /* Mechanism names */
  44 #define SSPI_MECH_NTLM      "NTLM"
  45 #define SSPI_MECH_KERBEROS  "Kerberos"
  46 #define SSPI_MECH_NEGOTIATE "Negotiate"
  47
  48 #ifndef ISC_REQ_IDENTIFY
  49 #define ISC_REQ_IDENTIFY               0x00002000
  50 #endif
  51
  52 typedef struct _context_sspi {
  53         struct sip_sec_context common;
  54         CredHandle* cred_sspi;
  55         CtxtHandle* ctx_sspi;
  56         /** Kerberos or NTLM */
  57         const char *mech;
  58 } *context_sspi;
  59
  60 static int
  61 sip_sec_get_interval_from_now_sec(TimeStamp timestamp);
  62
  63 void
  64 sip_sec_sspi_print_error(const char *func,
  65                          SECURITY_STATUS ret);
  66
  67 /** internal method */
  68 static void
  69 sip_sec_destroy_sspi_context(context_sspi context)
  70 {
  71         if (context->ctx_sspi)
  72                 DeleteSecurityContext(context->ctx_sspi);
  73         if (context->cred_sspi)
  74                 FreeCredentialsHandle(context->cred_sspi);
  75 }
  76
  77 /* sip-sec-mech.h API implementation for SSPI - Kerberos and NTLM */
  78
  79 static sip_uint32
  80 sip_sec_acquire_cred__sspi(SipSecContext context,
  81                            const char *domain,
  82                            const char *username,
  83                            const char *password)
  84 {
  85         SECURITY_STATUS ret;
  86         TimeStamp expiry;
  87         SEC_WINNT_AUTH_IDENTITY auth_identity;
  88         context_sspi ctx = (context_sspi)context;
  89         CredHandle *cred_handle;
  90
  91         if (username) {
  92                 if (!password) {
  93                         return SIP_SEC_E_INTERNAL_ERROR;
  94                 }
  95
  96                 memset(&auth_identity, 0, sizeof(auth_identity));
  97                 auth_identity.Flags = SEC_WINNT_AUTH_IDENTITY_ANSI;
  98
  99                 if ( domain && (strlen(domain) > 0) ) {
 100                         auth_identity.Domain = (unsigned char*)domain;
 101                         auth_identity.DomainLength = strlen(domain);
 102                 }
 103
 104                 auth_identity.User = (unsigned char*)username;
 105                 auth_identity.UserLength = strlen(username);
 106
 107                 auth_identity.Password = (unsigned char*)password;
 108                 auth_identity.PasswordLength = strlen(password);
 109         }
 110
 111         cred_handle = g_malloc0(sizeof(CredHandle));
 112
 113         ret = AcquireCredentialsHandle( NULL,
 114                                         (SEC_CHAR *)ctx->mech,
 115                                         SECPKG_CRED_OUTBOUND,
 116                                         NULL,
 117                                         (context->sso || !username) ? NULL : &auth_identity,
 118                                         NULL,
 119                                         NULL,
 120                                         cred_handle,
 121                                         &expiry
 122                                         );
 123
 124         if (ret != SEC_E_OK) {
 125                 sip_sec_sspi_print_error("sip_sec_acquire_cred__sspi: AcquireCredentialsHandle", ret);
 126                 ctx->cred_sspi = NULL;
 127                 return SIP_SEC_E_INTERNAL_ERROR;
 128         } else {
 129                 ctx->cred_sspi = cred_handle;
 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 = InitializeSecurityContext(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
 193         if (ret != SEC_E_OK && ret != SEC_I_CONTINUE_NEEDED) {
 194                 sip_sec_destroy_sspi_context(ctx);
 195                 sip_sec_sspi_print_error("sip_sec_init_sec_context__sspi: InitializeSecurityContext", ret);
 196                 return SIP_SEC_E_INTERNAL_ERROR;
 197         }
 198
 199         out_buff->length = out_token.cbBuffer;
 200         out_buff->value = NULL;
 201         if (out_token.cbBuffer) {
 202                 out_buff->value = g_malloc0(out_token.cbBuffer);
 203                 memmove(out_buff->value, out_token.pvBuffer, out_token.cbBuffer);
 204                 FreeContextBuffer(out_token.pvBuffer);
 205         }
 206
 207         ctx->ctx_sspi = out_context;
 208         if (ctx->mech && !strcmp(ctx->mech, SSPI_MECH_KERBEROS)) {
 209                 context->expires = sip_sec_get_interval_from_now_sec(expiry);
 210         }
 211
 212         if (ret == SEC_I_CONTINUE_NEEDED) {
 213                 return SIP_SEC_I_CONTINUE_NEEDED;
 214         } else  {
 215                 return SIP_SEC_E_OK;
 216         }
 217 }
 218
 219 static void
 220 sip_sec_destroy_sec_context__sspi(SipSecContext context)
 221 {
 222         sip_sec_destroy_sspi_context((context_sspi)context);
 223         g_free(context);
 224 }
 225
 226 /**
 227  * @param message a NULL terminated string to sign
 228  *
 229  */
 230 static sip_uint32
 231 sip_sec_make_signature__sspi(SipSecContext context,
 232                              const char *message,
 233                              SipSecBuffer *signature)
 234 {
 235         SecBufferDesc buffs_desc;
 236         SecBuffer buffs[2];
 237         SECURITY_STATUS ret;
 238         SecPkgContext_Sizes context_sizes;
 239         unsigned char *signature_buff;
 240         size_t signature_buff_length;
 241         context_sspi ctx = (context_sspi) context;
 242
 243         ret = QueryContextAttributes(ctx->ctx_sspi,
 244                                         SECPKG_ATTR_SIZES,
 245                                         &context_sizes);
 246
 247         if (ret != SEC_E_OK) {
 248                 sip_sec_sspi_print_error("sip_sec_make_signature__sspi: QueryContextAttributes", ret);
 249                 return SIP_SEC_E_INTERNAL_ERROR;
 250         }
 251
 252         signature_buff_length = context_sizes.cbMaxSignature;
 253         signature_buff = g_malloc0(signature_buff_length);
 254
 255         buffs_desc.cBuffers = 2;
 256         buffs_desc.pBuffers = buffs;
 257         buffs_desc.ulVersion = SECBUFFER_VERSION;
 258
 259         /* message to sign */
 260         buffs[0].BufferType = SECBUFFER_DATA;
 261         buffs[0].cbBuffer = strlen(message);
 262         buffs[0].pvBuffer = (PVOID)message;
 263
 264         /* to hold signature */
 265         buffs[1].BufferType = SECBUFFER_TOKEN;
 266         buffs[1].cbBuffer = signature_buff_length;
 267         buffs[1].pvBuffer = signature_buff;
 268
 269         ret = MakeSignature(ctx->ctx_sspi,
 270                             (ULONG)0,
 271                             &buffs_desc,
 272                             100);
 273         if (ret != SEC_E_OK) {
 274                 sip_sec_sspi_print_error("sip_sec_make_signature__sspi: MakeSignature", ret);
 275                 g_free(signature_buff);
 276                 return SIP_SEC_E_INTERNAL_ERROR;
 277         }
 278
 279         signature->value = signature_buff;
 280         signature->length = buffs[1].cbBuffer;
 281
 282         return SIP_SEC_E_OK;
 283 }
 284
 285 /**
 286  * @param message a NULL terminated string to check signature of
 287  * @return SIP_SEC_E_OK on success
 288  */
 289 static sip_uint32
 290 sip_sec_verify_signature__sspi(SipSecContext context,
 291                                const char *message,
 292                                SipSecBuffer signature)
 293 {
 294         SecBufferDesc buffs_desc;
 295         SecBuffer buffs[2];
 296         SECURITY_STATUS ret;
 297
 298         buffs_desc.cBuffers = 2;
 299         buffs_desc.pBuffers = buffs;
 300         buffs_desc.ulVersion = SECBUFFER_VERSION;
 301
 302         /* message to sign */
 303         buffs[0].BufferType = SECBUFFER_DATA;
 304         buffs[0].cbBuffer = strlen(message);
 305         buffs[0].pvBuffer = (PVOID)message;
 306
 307         /* signature to check */
 308         buffs[1].BufferType = SECBUFFER_TOKEN;
 309         buffs[1].cbBuffer = signature.length;
 310         buffs[1].pvBuffer = signature.value;
 311
 312         ret = VerifySignature(((context_sspi)context)->ctx_sspi,
 313                               &buffs_desc,
 314                               0,
 315                               0);
 316
 317         if (ret != SEC_E_OK) {
 318                 sip_sec_sspi_print_error("sip_sec_verify_signature__sspi: VerifySignature", ret);
 319                 return SIP_SEC_E_INTERNAL_ERROR;
 320         }
 321
 322         return SIP_SEC_E_OK;
 323 }
 324
 325 SipSecContext
 326 sip_sec_create_context__sspi(guint type)
 327 {
 328         context_sspi context = g_malloc0(sizeof(struct _context_sspi));
 329         if (!context) return(NULL);
 330
 331         context->common.acquire_cred_func     = sip_sec_acquire_cred__sspi;
 332         context->common.init_context_func     = sip_sec_init_sec_context__sspi;
 333         context->common.destroy_context_func  = sip_sec_destroy_sec_context__sspi;
 334         context->common.make_signature_func   = sip_sec_make_signature__sspi;
 335         context->common.verify_signature_func = sip_sec_verify_signature__sspi;
 336         context->mech = (type == AUTH_TYPE_NTLM) ? SSPI_MECH_NTLM :
 337                         ((type == AUTH_TYPE_KERBEROS) ? SSPI_MECH_KERBEROS : SSPI_MECH_NEGOTIATE);
 338
 339         return((SipSecContext) context);
 340 }
 341
 342 /* Utility Functions */
 343
 344 /**
 345  * Returns interval in seconds from now till provided value
 346  */
 347 static int
 348 sip_sec_get_interval_from_now_sec(TimeStamp timestamp)
 349 {
 350         SYSTEMTIME stNow;
 351         FILETIME ftNow;
 352         ULARGE_INTEGER uliNow, uliTo;
 353
 354         GetLocalTime(&stNow);
 355         SystemTimeToFileTime(&stNow, &ftNow);
 356
 357         uliNow.LowPart = ftNow.dwLowDateTime;
 358         uliNow.HighPart = ftNow.dwHighDateTime;
 359
 360         uliTo.LowPart = timestamp.LowPart;
 361         uliTo.HighPart = timestamp.HighPart;
 362
 363         return (int)((uliTo.QuadPart - uliNow.QuadPart)/10/1000/1000);
 364 }
 365
 366 void
 367 sip_sec_sspi_print_error(const char *func,
 368                          SECURITY_STATUS ret)
 369 {
 370         char *error_message;
 371         static char *buff;
 372         int buff_length;
 373
 374         buff_length = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM |
 375                                     FORMAT_MESSAGE_ALLOCATE_BUFFER |
 376                                     FORMAT_MESSAGE_IGNORE_INSERTS,
 377                                     0,
 378                                     ret,
 379                                     0,
 380                                     (LPTSTR)&buff,
 381                                     16384,
 382                                     0);
 383         error_message = g_strndup(buff, buff_length);
 384         LocalFree(buff);
 385
 386         printf("SSPI ERROR [%d] in %s: %s", (int)ret, func, error_message);
 387         g_free(error_message);
 388 }
 389
 390
 391 /*
 392   Local Variables:
 393   mode: c
 394   c-file-style: "bsd"
 395   indent-tabs-mode: t
 396   tab-width: 8
 397   End:
 398 */