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 #include <glib.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <stdio.h>
  28 #include "debug.h"
  29 /* #include "util.h" */
  30 #include "sip-sec.h"
  31 #include "sip-sec-mech.h"
  32
  33 #include "sip-sec-ntlm.h"
  34 #ifndef _WIN32
  35 #define sip_sec_create_context__NTLM            sip_sec_create_context__ntlm
  36 #define sip_sec_create_context__Negotiate       sip_sec_create_context__NONE
  37
  38 #ifdef USE_KERBEROS
  39 #include "sip-sec-krb5.h"
  40 #define sip_sec_create_context__Kerberos        sip_sec_create_context__krb5
  41 #else
  42 #define sip_sec_create_context__Kerberos        sip_sec_create_context__NONE
  43 #endif
  44
  45 #else /* _WIN32 */
  46 #ifdef USE_KERBEROS
  47 #include "sip-sec-sspi.h"
  48 #define sip_sec_create_context__NTLM            sip_sec_create_context__sspi
  49 #define sip_sec_create_context__Negotiate       sip_sec_create_context__sspi
  50 #define sip_sec_create_context__Kerberos        sip_sec_create_context__sspi
  51 #else /* USE_KERBEROS */
  52 #define sip_sec_create_context__NTLM            sip_sec_create_context__ntlm
  53 #define sip_sec_create_context__Negotiate       sip_sec_create_context__NONE
  54 #define sip_sec_create_context__Kerberos        sip_sec_create_context__NONE
  55 #endif /* USE_KERBEROS */
  56
  57 #endif /* _WIN32 */
  58
  59 gchar *purple_base64_encode(const guchar *data, gsize len);
  60 guchar *purple_base64_decode(const char *str, gsize *ret_len);
  61
  62 /* @TODO: copy&paste stinks. Find a better solution! */
  63 size_t
  64 hex_str_to_buff(const char *hex_str, guint8 **buff);
  65 char *
  66 buff_to_hex_str(const guint8 *buff, const size_t buff_len);
  67
  68 /* Dummy initialization hook */
  69 static SipSecContext
  70 sip_sec_create_context__NONE(SIPE_UNUSED_PARAMETER SipSecAuthType type)
  71 {
  72         return(NULL);
  73 }
  74
  75 /* sip_sec API methods */
  76 SipSecContext
  77 sip_sec_create_context(SipSecAuthType type,
  78                        const int  sso,
  79                        int is_connection_based,
  80                        const char *domain,
  81                        const char *username,
  82                        const char *password)
  83 {
  84         SipSecContext context = NULL;
  85
  86         /* Map authentication type to module initialization hook & name */
  87         static sip_sec_create_context_func const auth_to_hook[] = {
  88                 sip_sec_create_context__NONE,      /* AUTH_TYPE_UNSET     */
  89                 sip_sec_create_context__NONE,      /* AUTH_TYPE_DIGEST    */
  90                 sip_sec_create_context__NTLM,      /* AUTH_TYPE_NTLM      */
  91                 sip_sec_create_context__Kerberos,  /* AUTH_TYPE_KERBEROS  */
  92                 sip_sec_create_context__Negotiate, /* AUTH_TYPE_NEGOTIATE */
  93         };
  94
  95         context = (*(auth_to_hook[type]))(type);
  96         if (context) {
  97                 sip_uint32 ret;
  98
  99                 context->sso = sso;
 100                 context->is_connection_based = is_connection_based;
 101
 102                 ret = (*context->acquire_cred_func)(context, domain, username, password);
 103                 if (ret != SIP_SEC_E_OK) {
 104                         purple_debug_info("sipe", "ERROR: sip_sec_init_context failed to acquire credentials.\n");
 105                         (*context->destroy_context_func)(context);
 106                         context = NULL;
 107                 }
 108         }
 109
 110         return(context);
 111 }
 112
 113 unsigned long
 114 sip_sec_init_context_step(SipSecContext context,
 115                           const char *target,
 116                           const char *input_toked_base64,
 117                           char **output_toked_base64,
 118                           int *expires)
 119 {
 120         sip_uint32 ret = SIP_SEC_E_INTERNAL_ERROR;
 121
 122         if (context) {
 123                 SipSecBuffer in_buff  = {0, NULL};
 124                 SipSecBuffer out_buff = {0, NULL};
 125                 char *tmp;
 126
 127                 /* Not NULL for NTLM Type 2 */
 128                 if (input_toked_base64) {
 129                         in_buff.value = purple_base64_decode(input_toked_base64, &(in_buff.length));
 130
 131                         tmp = sip_sec_ntlm_message_describe(in_buff);
 132                         if (tmp) {
 133                                 purple_debug_info("sipe", "sip_sec_init_context_step: Challenge message is:\n%s", tmp);
 134                         }
 135                         g_free(tmp);
 136                 }
 137
 138                 ret = (*context->init_context_func)(context, in_buff, &out_buff, target);
 139
 140                 if (input_toked_base64)
 141                         g_free(in_buff.value);
 142
 143                 if (ret == SIP_SEC_E_OK || ret == SIP_SEC_I_CONTINUE_NEEDED) {
 144                         *output_toked_base64 = purple_base64_encode(out_buff.value, out_buff.length);
 145
 146                         if (out_buff.length > 0 && out_buff.value) {
 147                                 tmp = sip_sec_ntlm_message_describe(out_buff);
 148                                 if (tmp) {
 149                                         purple_debug_info("sipe", "sip_sec_init_context_step: Negotiate or Authenticate message is:\n%s", tmp);
 150                                 }
 151                                 g_free(tmp);
 152                         }
 153
 154                         g_free(out_buff.value);
 155                 }
 156
 157                 if (expires) {
 158                         *expires = context->expires;
 159                 }
 160         }
 161
 162         return ret;
 163 }
 164
 165 char *
 166 sip_sec_init_context(SipSecContext *context,
 167                      int *expires,
 168                      SipSecAuthType type,
 169                      const int  sso,
 170                      const char *domain,
 171                      const char *username,
 172                      const char *password,
 173                      const char *target,
 174                      const char *input_toked_base64)
 175 {
 176         sip_uint32 ret;
 177         char *output_toked_base64 = NULL;
 178         int exp;
 179
 180         *context = sip_sec_create_context(type,
 181                                           sso,
 182                                           0, /* Connectionless for SIP */
 183                                           domain,
 184                                           username,
 185                                           password);
 186         if (!*context) return NULL;
 187
 188         ret = sip_sec_init_context_step(*context,
 189                                         target,
 190                                         NULL,
 191                                         &output_toked_base64,
 192                                         &exp);
 193
 194         /* for NTLM type 3 */
 195         if (ret == SIP_SEC_I_CONTINUE_NEEDED) {
 196                 g_free(output_toked_base64);
 197                 ret = sip_sec_init_context_step(*context,
 198                                                 target,
 199                                                 input_toked_base64,
 200                                                 &output_toked_base64,
 201                                                 &exp);
 202         }
 203
 204         if (expires) {
 205                 *expires = exp;
 206         }
 207
 208         return output_toked_base64;
 209 }
 210
 211 void
 212 sip_sec_destroy_context(SipSecContext context)
 213 {
 214         if (context) (*context->destroy_context_func)(context);
 215 }
 216
 217 char * sip_sec_make_signature(SipSecContext context, const char *message)
 218 {
 219         SipSecBuffer signature;
 220         char *signature_hex;
 221
 222         if(((*context->make_signature_func)(context, message, &signature)) != SIP_SEC_E_OK) {
 223                 purple_debug_info("sipe", "ERROR: sip_sec_make_signature failed. Unable to sign message!\n");
 224                 return NULL;
 225         }
 226         signature_hex = buff_to_hex_str(signature.value, signature.length);
 227         g_free(signature.value);
 228         return signature_hex;
 229 }
 230
 231 int sip_sec_verify_signature(SipSecContext context, const char *message, const char *signature_hex)
 232 {
 233         SipSecBuffer signature;
 234         sip_uint32 res;
 235
 236         purple_debug_info("sipe", "sip_sec_verify_signature: message is:%s signature to verify is:%s\n",
 237                           message ? message : "", signature_hex ? signature_hex : "");
 238
 239         if (!message || !signature_hex) return SIP_SEC_E_INTERNAL_ERROR;
 240
 241         signature.length = hex_str_to_buff(signature_hex, &signature.value);
 242         res = (*context->verify_signature_func)(context, message, signature);
 243         g_free(signature.value);
 244         return res;
 245 }
 246
 247 /* Initialize & Destroy */
 248 void sip_sec_init(void)
 249 {
 250         sip_sec_init__ntlm();
 251 }
 252
 253 void sip_sec_destroy(void)
 254 {
 255         sip_sec_destroy__ntlm();
 256 }
 257
 258 /*
 259   Local Variables:
 260   mode: c
 261   c-file-style: "bsd"
 262   indent-tabs-mode: t
 263   tab-width: 8
 264   End:
 265 */