src/core/sip-sec.c

   1 /**
   2  * @file sip-sec.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 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif
  27
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <stdio.h>
  31 #include <time.h>
  32
  33 #include <glib.h>
  34
  35 #include "debug.h"
  36 #include "util.h"
  37
  38 #include "sip-sec.h"
  39 #include "sipe-core-api.h"
  40 #include "sipe-utils.h"
  41
  42 #include "sip-sec-mech.h"
  43 #include "sip-sec-ntlm.h"
  44 #ifndef _WIN32
  45 #define sip_sec_create_context__NTLM            sip_sec_create_context__ntlm
  46 #define sip_sec_create_context__Negotiate       sip_sec_create_context__NONE
  47
  48 #ifdef HAVE_KERBEROS
  49 #include "sip-sec-krb5.h"
  50 #define sip_sec_create_context__Kerberos        sip_sec_create_context__krb5
  51 #else
  52 #define sip_sec_create_context__Kerberos        sip_sec_create_context__NONE
  53 #endif
  54
  55 #else /* _WIN32 */
  56 #ifdef HAVE_KERBEROS
  57 #include "sip-sec-sspi.h"
  58 #define sip_sec_create_context__NTLM            sip_sec_create_context__sspi
  59 #define sip_sec_create_context__Negotiate       sip_sec_create_context__sspi
  60 #define sip_sec_create_context__Kerberos        sip_sec_create_context__sspi
  61 #else /* HAVE_KERBEROS */
  62 #define sip_sec_create_context__NTLM            sip_sec_create_context__ntlm
  63 #define sip_sec_create_context__Negotiate       sip_sec_create_context__NONE
  64 #define sip_sec_create_context__Kerberos        sip_sec_create_context__NONE
  65 #endif /* HAVE_KERBEROS */
  66
  67 #endif /* _WIN32 */
  68
  69 /* Dummy initialization hook */
  70 static SipSecContext
  71 sip_sec_create_context__NONE(SIPE_UNUSED_PARAMETER SipSecAuthType type)
  72 {
  73         return(NULL);
  74 }
  75
  76 /* sip_sec API methods */
  77 SipSecContext
  78 sip_sec_create_context(SipSecAuthType type,
  79                        const int  sso,
  80                        int is_connection_based,
  81                        const char *domain,
  82                        const char *username,
  83                        const char *password)
  84 {
  85         SipSecContext context = NULL;
  86
  87         /* Map authentication type to module initialization hook & name */
  88         static sip_sec_create_context_func const auth_to_hook[] = {
  89                 sip_sec_create_context__NONE,      /* AUTH_TYPE_UNSET     */
  90                 sip_sec_create_context__NONE,      /* AUTH_TYPE_DIGEST    */
  91                 sip_sec_create_context__NTLM,      /* AUTH_TYPE_NTLM      */
  92                 sip_sec_create_context__Kerberos,  /* AUTH_TYPE_KERBEROS  */
  93                 sip_sec_create_context__Negotiate, /* AUTH_TYPE_NEGOTIATE */
  94         };
  95
  96         context = (*(auth_to_hook[type]))(type);
  97         if (context) {
  98                 sip_uint32 ret;
  99
 100                 context->sso = sso;
 101                 context->is_connection_based = is_connection_based;
 102
 103                 ret = (*context->acquire_cred_func)(context, domain, username, password);
 104                 if (ret != SIP_SEC_E_OK) {
 105                         purple_debug_info("sipe", "ERROR: sip_sec_init_context failed to acquire credentials.\n");
 106                         (*context->destroy_context_func)(context);
 107                         context = NULL;
 108                 }
 109         }
 110
 111         return(context);
 112 }
 113
 114 unsigned long
 115 sip_sec_init_context_step(SipSecContext context,
 116                           const char *target,
 117                           const char *input_toked_base64,
 118                           char **output_toked_base64,
 119                           int *expires)
 120 {
 121         sip_uint32 ret = SIP_SEC_E_INTERNAL_ERROR;
 122
 123         if (context) {
 124                 SipSecBuffer in_buff  = {0, NULL};
 125                 SipSecBuffer out_buff = {0, NULL};
 126                 char *tmp;
 127
 128                 /* Not NULL for NTLM Type 2 */
 129                 if (input_toked_base64) {
 130                         in_buff.value = purple_base64_decode(input_toked_base64, &(in_buff.length));
 131
 132                         tmp = sip_sec_ntlm_message_describe(in_buff);
 133                         if (tmp) {
 134                                 purple_debug_info("sipe", "sip_sec_init_context_step: Challenge message is:\n%s", tmp);
 135                         }
 136                         g_free(tmp);
 137                 }
 138
 139                 ret = (*context->init_context_func)(context, in_buff, &out_buff, target);
 140
 141                 if (input_toked_base64)
 142                         g_free(in_buff.value);
 143
 144                 if (ret == SIP_SEC_E_OK || ret == SIP_SEC_I_CONTINUE_NEEDED) {
 145                         *output_toked_base64 = purple_base64_encode(out_buff.value, out_buff.length);
 146
 147                         if (out_buff.length > 0 && out_buff.value) {
 148                                 tmp = sip_sec_ntlm_message_describe(out_buff);
 149                                 if (tmp) {
 150                                         purple_debug_info("sipe", "sip_sec_init_context_step: Negotiate or Authenticate message is:\n%s", tmp);
 151                                 }
 152                                 g_free(tmp);
 153                         }
 154
 155                         g_free(out_buff.value);
 156                 }
 157
 158                 if (expires) {
 159                         *expires = context->expires;
 160                 }
 161         }
 162
 163         return ret;
 164 }
 165
 166 char *
 167 sip_sec_init_context(SipSecContext *context,
 168                      int *expires,
 169                      SipSecAuthType type,
 170                      const int  sso,
 171                      const char *domain,
 172                      const char *username,
 173                      const char *password,
 174                      const char *target,
 175                      const char *input_toked_base64)
 176 {
 177         sip_uint32 ret;
 178         char *output_toked_base64 = NULL;
 179         int exp;
 180
 181         *context = sip_sec_create_context(type,
 182                                           sso,
 183                                           0, /* Connectionless for SIP */
 184                                           domain,
 185                                           username,
 186                                           password);
 187         if (!*context) {
 188                 purple_debug_info("sipe", "ERROR: sip_sec_init_context: failed sip_sec_create_context()\n");
 189                 return NULL;
 190         }
 191
 192         ret = sip_sec_init_context_step(*context,
 193                                         target,
 194                                         NULL,
 195                                         &output_toked_base64,
 196                                         &exp);
 197
 198         /* for NTLM type 3 */
 199         if (ret == SIP_SEC_I_CONTINUE_NEEDED) {
 200                 g_free(output_toked_base64);
 201                 ret = sip_sec_init_context_step(*context,
 202                                                 target,
 203                                                 input_toked_base64,
 204                                                 &output_toked_base64,
 205                                                 &exp);
 206         }
 207
 208         if (expires) {
 209                 *expires = exp;
 210         }
 211
 212         return output_toked_base64;
 213 }
 214
 215 void
 216 sip_sec_destroy_context(SipSecContext context)
 217 {
 218         if (context) (*context->destroy_context_func)(context);
 219 }
 220
 221 char * sip_sec_make_signature(SipSecContext context, const char *message)
 222 {
 223         SipSecBuffer signature;
 224         char *signature_hex;
 225
 226         if(((*context->make_signature_func)(context, message, &signature)) != SIP_SEC_E_OK) {
 227                 purple_debug_info("sipe", "ERROR: sip_sec_make_signature failed. Unable to sign message!\n");
 228                 return NULL;
 229         }
 230         signature_hex = buff_to_hex_str(signature.value, signature.length);
 231         g_free(signature.value);
 232         return signature_hex;
 233 }
 234
 235 int sip_sec_verify_signature(SipSecContext context, const char *message, const char *signature_hex)
 236 {
 237         SipSecBuffer signature;
 238         sip_uint32 res;
 239
 240         purple_debug_info("sipe", "sip_sec_verify_signature: message is:%s signature to verify is:%s\n",
 241                           message ? message : "", signature_hex ? signature_hex : "");
 242
 243         if (!message || !signature_hex) return SIP_SEC_E_INTERNAL_ERROR;
 244
 245         signature.length = hex_str_to_buff(signature_hex, &signature.value);
 246         res = (*context->verify_signature_func)(context, message, signature);
 247         g_free(signature.value);
 248         return res;
 249 }
 250
 251 /* Initialize & Destroy */
 252 void sip_sec_init(void)
 253 {
 254         sip_sec_init__ntlm();
 255 }
 256
 257 void sip_sec_destroy(void)
 258 {
 259         sip_sec_destroy__ntlm();
 260 }
 261
 262 /*
 263   Local Variables:
 264   mode: c
 265   c-file-style: "bsd"
 266   indent-tabs-mode: t
 267   tab-width: 8
 268   End:
 269 */