src/src/auths/call_radius.c

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2016 */
   6 /* See the file NOTICE for conditions of use and distribution. */
   7
   8 /* This file was originally supplied by Ian Kirk. The libradius support came
   9 from Alex Kiernan. */
  10
  11 /* ugly hack to work around redefinition of ENV by radiusclient.h and
  12  * db.h: define _DB_H_ so the db.h include thinks it's already included,
  13  * we can get away with it like this, since this file doesn't use any db
  14  * functions. */
  15 #ifndef _DB_H_
  16 # define _DB_H_ 1
  17 # define _DB_EXT_PROT_IN_ 1
  18 # define DB void
  19 #endif
  20
  21 #include "../exim.h"
  22
  23 /* This module contains functions that call the Radius authentication
  24 mechanism.
  25
  26 We can't just compile this code and allow the library mechanism to omit the
  27 functions if they are not wanted, because we need to have the Radius headers
  28 available for compiling. Therefore, compile these functions only if
  29 RADIUS_CONFIG_FILE is defined. However, some compilers don't like compiling
  30 empty modules, so keep them happy with a dummy when skipping the rest. Make it
  31 reference itself to stop picky compilers complaining that it is unused, and put
  32 in a dummy argument to stop even pickier compilers complaining about infinite
  33 loops. Then use a mutually-recursive pair as gcc is just getting stupid. */
  34
  35 #ifndef RADIUS_CONFIG_FILE
  36 static void dummy(int x);
  37 static void dummy2(int x) { dummy(x-1); }
  38 static void dummy(int x) { dummy2(x-1); }
  39 #else  /* RADIUS_CONFIG_FILE */
  40
  41
  42 /* Two different Radius libraries are supported. The default is radiusclient,
  43 using its original API. At release 0.4.0 the API changed. */
  44
  45 #ifdef RADIUS_LIB_RADLIB
  46   #include <radlib.h>
  47 #else
  48   #if !defined(RADIUS_LIB_RADIUSCLIENT) && !defined(RADIUS_LIB_RADIUSCLIENTNEW)
  49   # define RADIUS_LIB_RADIUSCLIENT
  50   #endif
  51
  52   #ifdef RADIUS_LIB_RADIUSCLIENTNEW
  53   # include <freeradius-client.h>
  54   #else
  55   # include <radiusclient.h>
  56   #endif
  57 #endif
  58
  59
  60
  61 /*************************************************
  62 *              Perform RADIUS authentication     *
  63 *************************************************/
  64
  65 /* This function calls the Radius authentication mechanism, passing over one or
  66 more data strings.
  67
  68 Arguments:
  69   s        a colon-separated list of strings
  70   errptr   where to point an error message
  71
  72 Returns:   OK if authentication succeeded
  73            FAIL if authentication failed
  74            ERROR some other error condition
  75 */
  76
  77 int
  78 auth_call_radius(const uschar *s, uschar **errptr)
  79 {
  80 uschar *user;
  81 const uschar *radius_args = s;
  82 int result;
  83 int sep = 0;
  84
  85 #ifdef RADIUS_LIB_RADLIB
  86   struct rad_handle *h;
  87 #else
  88   #ifdef RADIUS_LIB_RADIUSCLIENTNEW
  89     rc_handle *h;
  90   #endif
  91   VALUE_PAIR *send = NULL;
  92   VALUE_PAIR *received;
  93   unsigned int service = PW_AUTHENTICATE_ONLY;
  94   char msg[4096];
  95 #endif
  96
  97
  98 user = string_nextinlist(&radius_args, &sep, big_buffer, big_buffer_size);
  99 if (user == NULL) user = US"";
 100
 101 DEBUG(D_auth) debug_printf("Running RADIUS authentication for user \"%s\" "
 102                "and \"%s\"\n", user, radius_args);
 103
 104 *errptr = NULL;
 105
 106
 107 /* Authenticate using the radiusclient library */
 108
 109 #ifndef RADIUS_LIB_RADLIB
 110
 111 rc_openlog("exim");
 112
 113 #ifdef RADIUS_LIB_RADIUSCLIENT
 114 if (rc_read_config(RADIUS_CONFIG_FILE) != 0)
 115   *errptr = string_sprintf("RADIUS: can't open %s", RADIUS_CONFIG_FILE);
 116
 117 else if (rc_read_dictionary(rc_conf_str("dictionary")) != 0)
 118   *errptr = string_sprintf("RADIUS: can't read dictionary");
 119
 120 else if (rc_avpair_add(&send, PW_USER_NAME, user, 0) == NULL)
 121   *errptr = string_sprintf("RADIUS: add user name failed\n");
 122
 123 else if (rc_avpair_add(&send, PW_USER_PASSWORD, CS radius_args, 0) == NULL)
 124   *errptr = string_sprintf("RADIUS: add password failed\n");
 125
 126 else if (rc_avpair_add(&send, PW_SERVICE_TYPE, &service, 0) == NULL)
 127   *errptr = string_sprintf("RADIUS: add service type failed\n");
 128
 129 #else  /* RADIUS_LIB_RADIUSCLIENT unset => RADIUS_LIB_RADIUSCLIENT2 */
 130
 131 if ((h = rc_read_config(RADIUS_CONFIG_FILE)) == NULL)
 132   *errptr = string_sprintf("RADIUS: can't open %s", RADIUS_CONFIG_FILE);
 133
 134 else if (rc_read_dictionary(h, rc_conf_str(h, "dictionary")) != 0)
 135   *errptr = string_sprintf("RADIUS: can't read dictionary");
 136
 137 else if (rc_avpair_add(h, &send, PW_USER_NAME, user, Ustrlen(user), 0) == NULL)
 138   *errptr = string_sprintf("RADIUS: add user name failed\n");
 139
 140 else if (rc_avpair_add(h, &send, PW_USER_PASSWORD, CS radius_args,
 141     Ustrlen(radius_args), 0) == NULL)
 142   *errptr = string_sprintf("RADIUS: add password failed\n");
 143
 144 else if (rc_avpair_add(h, &send, PW_SERVICE_TYPE, &service, 0, 0) == NULL)
 145   *errptr = string_sprintf("RADIUS: add service type failed\n");
 146
 147 #endif  /* RADIUS_LIB_RADIUSCLIENT */
 148
 149 if (*errptr != NULL)
 150   {
 151   DEBUG(D_auth) debug_printf("%s\n", *errptr);
 152   return ERROR;
 153   }
 154
 155 #ifdef RADIUS_LIB_RADIUSCLIENT
 156 result = rc_auth(0, send, &received, msg);
 157 #else
 158 result = rc_auth(h, 0, send, &received, msg);
 159 #endif
 160
 161 DEBUG(D_auth) debug_printf("RADIUS code returned %d\n", result);
 162
 163 switch (result)
 164   {
 165   case OK_RC:
 166   return OK;
 167
 168   case ERROR_RC:
 169   return FAIL;
 170
 171   case TIMEOUT_RC:
 172   *errptr = US"RADIUS: timed out";
 173   return ERROR;
 174
 175   default:
 176   case BADRESP_RC:
 177   *errptr = string_sprintf("RADIUS: unexpected response (%d)", result);
 178   return ERROR;
 179   }
 180
 181 #else  /* RADIUS_LIB_RADLIB is set */
 182
 183 /* Authenticate using the libradius library */
 184
 185 h = rad_auth_open();
 186 if (h == NULL)
 187   {
 188   *errptr = string_sprintf("RADIUS: can't initialise libradius");
 189   return ERROR;
 190   }
 191 if (rad_config(h, RADIUS_CONFIG_FILE) != 0 ||
 192     rad_create_request(h, RAD_ACCESS_REQUEST) != 0 ||
 193     rad_put_string(h, RAD_USER_NAME, CS user) != 0 ||
 194     rad_put_string(h, RAD_USER_PASSWORD, CS radius_args) != 0 ||
 195     rad_put_int(h, RAD_SERVICE_TYPE, RAD_AUTHENTICATE_ONLY) != 0 ||
 196     rad_put_string(h, RAD_NAS_IDENTIFIER, CS primary_hostname) != 0)
 197   {
 198   *errptr = string_sprintf("RADIUS: %s", rad_strerror(h));
 199   result = ERROR;
 200   }
 201 else
 202   {
 203   result = rad_send_request(h);
 204
 205   switch(result)
 206     {
 207     case RAD_ACCESS_ACCEPT:
 208     result = OK;
 209     break;
 210
 211     case RAD_ACCESS_REJECT:
 212     result = FAIL;
 213     break;
 214
 215     case -1:
 216     *errptr = string_sprintf("RADIUS: %s", rad_strerror(h));
 217     result = ERROR;
 218     break;
 219
 220     default:
 221     *errptr = string_sprintf("RADIUS: unexpected response (%d)", result);
 222     result= ERROR;
 223     break;
 224     }
 225   }
 226
 227 if (*errptr != NULL) DEBUG(D_auth) debug_printf("%s\n", *errptr);
 228 rad_close(h);
 229 return result;
 230
 231 #endif  /* RADIUS_LIB_RADLIB */
 232 }
 233
 234 #endif  /* RADIUS_CONFIG_FILE */
 235
 236 /* End of call_radius.c */