1 files changed, 232 insertions, 0 deletions
diff --git a/src/auths/call_radius.c b/src/auths/call_radius.c
new file mode 100644
index 0000000..9d10b34
--- /dev/null
+++ b/src/auths/call_radius.c
@@ -0,0 +1,232 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Copyright (c) The Exim Maintainers 2020 */
+/* Copyright (c) University of Cambridge 1995 - 2016 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+/* This file was originally supplied by Ian Kirk. The libradius support came
+from Alex Kiernan. */
+
+/* ugly hack to work around redefinition of ENV by radiusclient.h and
+ * db.h: define _DB_H_ so the db.h include thinks it's already included,
+ * we can get away with it like this, since this file doesn't use any db
+ * functions. */
+#ifndef _DB_H_
+# define _DB_H_ 1
+# define _DB_EXT_PROT_IN_ 1
+# define DB void
+#endif
+
+#include "../exim.h"
+
+/* This module contains functions that call the Radius authentication
+mechanism.
+
+We can't just compile this code and allow the library mechanism to omit the
+functions if they are not wanted, because we need to have the Radius headers
+available for compiling. Therefore, compile these functions only if
+RADIUS_CONFIG_FILE is defined. However, some compilers don't like compiling
+empty modules, so keep them happy with a dummy when skipping the rest. Make it
+reference itself to stop picky compilers complaining that it is unused, and put
+in a dummy argument to stop even pickier compilers complaining about infinite
+loops. Then use a mutually-recursive pair as gcc is just getting stupid. */
+
+#ifndef RADIUS_CONFIG_FILE
+static void dummy(int x);
+static void dummy2(int x) { dummy(x-1); }
+static void dummy(int x) { dummy2(x-1); }
+#else  /* RADIUS_CONFIG_FILE */
+
+
+/* Two different Radius libraries are supported. The default is radiusclient,
+using its original API. At release 0.4.0 the API changed. */
+
+#ifdef RADIUS_LIB_RADLIB
+  #include <radlib.h>
+#else
+  #if !defined(RADIUS_LIB_RADIUSCLIENT) && !defined(RADIUS_LIB_RADIUSCLIENTNEW)
+  # define RADIUS_LIB_RADIUSCLIENT
+  #endif
+
+  #ifdef RADIUS_LIB_RADIUSCLIENTNEW
+  # include <freeradius-client.h>
+  #else
+  # include <radiusclient.h>
+  #endif
+#endif
+
+
+
+/*************************************************
+*              Perform RADIUS authentication     *
+*************************************************/
+
+/* This function calls the Radius authentication mechanism, passing over one or
+more data strings.
+
+Arguments:
+  s        a colon-separated list of strings
+  errptr   where to point an error message
+
+Returns:   OK if authentication succeeded
+           FAIL if authentication failed
+           ERROR some other error condition
+*/
+
+int
+auth_call_radius(const uschar *s, uschar **errptr)
+{
+uschar *user;
+const uschar *radius_args = s;
+int result;
+int sep = 0;
+
+#ifdef RADIUS_LIB_RADLIB
+  struct rad_handle *h;
+#else
+  #ifdef RADIUS_LIB_RADIUSCLIENTNEW
+    rc_handle *h;
+  #endif
+  VALUE_PAIR *send = NULL;
+  VALUE_PAIR *received;
+  unsigned int service = PW_AUTHENTICATE_ONLY;
+  char msg[4096];
+#endif
+
+
+if (!(user = string_nextinlist(&radius_args, &sep, NULL, 0))) user = US"";
+
+DEBUG(D_auth) debug_printf("Running RADIUS authentication for user \"%s\" "
+               "and \"%s\"\n", user, radius_args);
+
+*errptr = NULL;
+
+
+/* Authenticate using the radiusclient library */
+
+#ifndef RADIUS_LIB_RADLIB
+
+rc_openlog("exim");
+
+#ifdef RADIUS_LIB_RADIUSCLIENT
+if (rc_read_config(RADIUS_CONFIG_FILE) != 0)
+  *errptr = string_sprintf("RADIUS: can't open %s", RADIUS_CONFIG_FILE);
+
+else if (rc_read_dictionary(rc_conf_str("dictionary")) != 0)
+  *errptr = US"RADIUS: can't read dictionary";
+
+else if (!rc_avpair_add(&send, PW_USER_NAME, user, 0))
+  *errptr = US"RADIUS: add user name failed";
+
+else if (!rc_avpair_add(&send, PW_USER_PASSWORD, CS radius_args, 0))
+  *errptr = US"RADIUS: add password failed");
+
+else if (!rc_avpair_add(&send, PW_SERVICE_TYPE, &service, 0))
+  *errptr = US"RADIUS: add service type failed";
+
+#else  /* RADIUS_LIB_RADIUSCLIENT unset => RADIUS_LIB_RADIUSCLIENT2 */
+
+if (!(h = rc_read_config(RADIUS_CONFIG_FILE)))
+  *errptr = string_sprintf("RADIUS: can't open %s", RADIUS_CONFIG_FILE);
+
+else if (rc_read_dictionary(h, rc_conf_str(h, "dictionary")) != 0)
+  *errptr = US"RADIUS: can't read dictionary";
+
+else if (!rc_avpair_add(h, &send, PW_USER_NAME, user, Ustrlen(user), 0))
+  *errptr = US"RADIUS: add user name failed";
+
+else if (!rc_avpair_add(h, &send, PW_USER_PASSWORD, CS radius_args,
+    Ustrlen(radius_args), 0))
+  *errptr = US"RADIUS: add password failed";
+
+else if (!rc_avpair_add(h, &send, PW_SERVICE_TYPE, &service, 0, 0))
+  *errptr = US"RADIUS: add service type failed";
+
+#endif  /* RADIUS_LIB_RADIUSCLIENT */
+
+if (*errptr)
+  {
+  DEBUG(D_auth) debug_printf("%s\n", *errptr);
+  return ERROR;
+  }
+
+#ifdef RADIUS_LIB_RADIUSCLIENT
+result = rc_auth(0, send, &received, msg);
+#else
+result = rc_auth(h, 0, send, &received, msg);
+#endif
+
+DEBUG(D_auth) debug_printf("RADIUS code returned %d\n", result);
+
+switch (result)
+  {
+  case OK_RC:
+    return OK;
+
+  case REJECT_RC:
+  case ERROR_RC:
+    return FAIL;
+
+  case TIMEOUT_RC:
+    *errptr = US"RADIUS: timed out";
+    return ERROR;
+
+  case BADRESP_RC:
+  default:
+    *errptr = string_sprintf("RADIUS: unexpected response (%d)", result);
+    return ERROR;
+  }
+
+#else  /* RADIUS_LIB_RADLIB is set */
+
+/* Authenticate using the libradius library */
+
+if (!(h = rad_auth_open()))
+  {
+  *errptr = string_sprintf("RADIUS: can't initialise libradius");
+  return ERROR;
+  }
+if (rad_config(h, RADIUS_CONFIG_FILE) != 0 ||
+    rad_create_request(h, RAD_ACCESS_REQUEST) != 0 ||
+    rad_put_string(h, RAD_USER_NAME, CS user) != 0 ||
+    rad_put_string(h, RAD_USER_PASSWORD, CS radius_args) != 0 ||
+    rad_put_int(h, RAD_SERVICE_TYPE, RAD_AUTHENTICATE_ONLY) != 0 ||
+    rad_put_string(h, RAD_NAS_IDENTIFIER, CS primary_hostname) != 0)
+  {
+  *errptr = string_sprintf("RADIUS: %s", rad_strerror(h));
+  result = ERROR;
+  }
+else
+  switch (result = rad_send_request(h))
+    {
+    case RAD_ACCESS_ACCEPT:
+      result = OK;
+      break;
+
+    case RAD_ACCESS_REJECT:
+      result = FAIL;
+      break;
+
+    case -1:
+      *errptr = string_sprintf("RADIUS: %s", rad_strerror(h));
+      result = ERROR;
+      break;
+
+    default:
+      *errptr = string_sprintf("RADIUS: unexpected response (%d)", result);
+      result= ERROR;
+      break;
+    }
+
+if (*errptr) DEBUG(D_auth) debug_printf("%s\n", *errptr);
+rad_close(h);
+return result;
+
+#endif  /* RADIUS_LIB_RADLIB */
+}
+
+#endif  /* RADIUS_CONFIG_FILE */
+
+/* End of call_radius.c */