+/*************************************************
+* Exim - an Internet mail transport agent *
+*************************************************/
+
+/* Copyright (c) The Exim Maintainers 2020 - 2022 */
+/* Copyright (c) University of Cambridge 1995 - 2016 */
+/* See the file NOTICE for conditions of use and distribution. */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+/* This file was originally supplied by Ian Kirk. The libradius support came
+from Alex Kiernan. */
+
+#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
+# define ENV FREERADIUSCLIENT_ENV /* Avoid clash with Berkeley DB */
+# 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
+*/
+
+static 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 */
+}
+
+
+
+/******************************************************************************/
+/* Module API */
+
+static void * rad_functions[] = {
+ [RADIUS_AUTH_CALL] = auth_call_radius,
+};
+
+misc_module_info rad_module_info =
+{
+ .name = US"radius",
+# ifdef DYNLOOKUP
+ .dyn_magic = MISC_MODULE_MAGIC,
+# endif
+
+ .functions = rad_functions,
+ .functions_count = nelem(rad_functions),
+};
+
+#endif /* RADIUS_CONFIG_FILE */
+
+/* End of call_radius.c */
git://git.exim.org / exim.git / commitdiff