/* * RADIUS authentication server * Copyright (c) 2005-2009, Jouni Malinen * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Alternatively, this software may be distributed under the terms of BSD * license. * * See README and COPYING for more details. */ #include "includes.h" #include #include "common.h" #include "radius.h" #include "eloop.h" #include "eap_server/eap.h" #include "radius_server.h" /** * RADIUS_SESSION_TIMEOUT - Session timeout in seconds */ #define RADIUS_SESSION_TIMEOUT 60 /** * RADIUS_MAX_SESSION - Maximum number of active sessions */ #define RADIUS_MAX_SESSION 100 /** * RADIUS_MAX_MSG_LEN - Maximum message length for incoming RADIUS messages */ #define RADIUS_MAX_MSG_LEN 3000 static struct eapol_callbacks radius_server_eapol_cb; struct radius_client; struct radius_server_data; /** * struct radius_server_counters - RADIUS server statistics counters */ struct radius_server_counters { u32 access_requests; u32 invalid_requests; u32 dup_access_requests; u32 access_accepts; u32 access_rejects; u32 access_challenges; u32 malformed_access_requests; u32 bad_authenticators; u32 packets_dropped; u32 unknown_types; }; /** * struct radius_session - Internal RADIUS server data for a session */ struct radius_session { struct radius_session *next; struct radius_client *client; struct radius_server_data *server; unsigned int sess_id; struct eap_sm *eap; struct eap_eapol_interface *eap_if; struct radius_msg *last_msg; char *last_from_addr; int last_from_port; struct sockaddr_storage last_from; socklen_t last_fromlen; u8 last_identifier; struct radius_msg *last_reply; u8 last_authenticator[16]; }; /** * struct radius_client - Internal RADIUS server data for a client */ struct radius_client { struct radius_client *next; struct in_addr addr; struct in_addr mask; #ifdef CONFIG_IPV6 struct in6_addr addr6; struct in6_addr mask6; #endif /* CONFIG_IPV6 */ char *shared_secret; int shared_secret_len; struct radius_session *sessions; struct radius_server_counters counters; }; /** * struct radius_server_data - Internal RADIUS server data */ struct radius_server_data { /** * auth_sock - Socket for RADIUS authentication messages */ int auth_sock; /** * clients - List of authorized RADIUS clients */ struct radius_client *clients; /** * next_sess_id - Next session identifier */ unsigned int next_sess_id; /** * conf_ctx - Context pointer for callbacks * * This is used as the ctx argument in get_eap_user() calls. */ void *conf_ctx; /** * num_sess - Number of active sessions */ int num_sess; /** * eap_sim_db_priv - EAP-SIM/AKA database context * * This is passed to the EAP-SIM/AKA server implementation as a * callback context. */ void *eap_sim_db_priv; /** * ssl_ctx - TLS context * * This is passed to the EAP server implementation as a callback * context for TLS operations. */ void *ssl_ctx; /** * pac_opaque_encr_key - PAC-Opaque encryption key for EAP-FAST * * This parameter is used to set a key for EAP-FAST to encrypt the * PAC-Opaque data. It can be set to %NULL if EAP-FAST is not used. If * set, must point to a 16-octet key. */ u8 *pac_opaque_encr_key; /** * eap_fast_a_id - EAP-FAST authority identity (A-ID) * * If EAP-FAST is not used, this can be set to %NULL. In theory, this * is a variable length field, but due to some existing implementations * requiring A-ID to be 16 octets in length, it is recommended to use * that length for the field to provide interoperability with deployed * peer implementations. */ u8 *eap_fast_a_id; /** * eap_fast_a_id_len - Length of eap_fast_a_id buffer in octets */ size_t eap_fast_a_id_len; /** * eap_fast_a_id_info - EAP-FAST authority identifier information * * This A-ID-Info contains a user-friendly name for the A-ID. For * example, this could be the enterprise and server names in * human-readable format. This field is encoded as UTF-8. If EAP-FAST * is not used, this can be set to %NULL. */ char *eap_fast_a_id_info; /** * eap_fast_prov - EAP-FAST provisioning modes * * 0 = provisioning disabled, 1 = only anonymous provisioning allowed, * 2 = only authenticated provisioning allowed, 3 = both provisioning * modes allowed. */ int eap_fast_prov; /** * pac_key_lifetime - EAP-FAST PAC-Key lifetime in seconds * * This is the hard limit on how long a provisioned PAC-Key can be * used. */ int pac_key_lifetime; /** * pac_key_refresh_time - EAP-FAST PAC-Key refresh time in seconds * * This is a soft limit on the PAC-Key. The server will automatically * generate a new PAC-Key when this number of seconds (or fewer) of the * lifetime remains. */ int pac_key_refresh_time; /** * eap_sim_aka_result_ind - EAP-SIM/AKA protected success indication * * This controls whether the protected success/failure indication * (AT_RESULT_IND) is used with EAP-SIM and EAP-AKA. */ int eap_sim_aka_result_ind; /** * tnc - Trusted Network Connect (TNC) * * This controls whether TNC is enabled and will be required before the * peer is allowed to connect. Note: This is only used with EAP-TTLS * and EAP-FAST. If any other EAP method is enabled, the peer will be * allowed to connect without TNC. */ int tnc; /** * wps - Wi-Fi Protected Setup context * * If WPS is used with an external RADIUS server (which is quite * unlikely configuration), this is used to provide a pointer to WPS * context data. Normally, this can be set to %NULL. */ struct wps_context *wps; /** * ipv6 - Whether to enable IPv6 support in the RADIUS server */ int ipv6; /** * start_time - Timestamp of server start */ struct os_time start_time; /** * counters - Statistics counters for server operations * * These counters are the sum over all clients. */ struct radius_server_counters counters; /** * get_eap_user - Callback for fetching EAP user information * @ctx: Context data from conf_ctx * @identity: User identity * @identity_len: identity buffer length in octets * @phase2: Whether this is for Phase 2 identity * @user: Data structure for filling in the user information * Returns: 0 on success, -1 on failure * * This is used to fetch information from user database. The callback * will fill in information about allowed EAP methods and the user * password. The password field will be an allocated copy of the * password data and RADIUS server will free it after use. */ int (*get_eap_user)(void *ctx, const u8 *identity, size_t identity_len, int phase2, struct eap_user *user); /** * eap_req_id_text - Optional data for EAP-Request/Identity * * This can be used to configure an optional, displayable message that * will be sent in EAP-Request/Identity. This string can contain an * ASCII-0 character (nul) to separate network infromation per RFC * 4284. The actual string length is explicit provided in * eap_req_id_text_len since nul character will not be used as a string * terminator. */ char *eap_req_id_text; /** * eap_req_id_text_len - Length of eap_req_id_text buffer in octets */ size_t eap_req_id_text_len; }; extern int wpa_debug_level; #define RADIUS_DEBUG(args...) \ wpa_printf(MSG_DEBUG, "RADIUS SRV: " args) #define RADIUS_ERROR(args...) \ wpa_printf(MSG_ERROR, "RADIUS SRV: " args) #define RADIUS_DUMP(args...) \ wpa_hexdump(MSG_MSGDUMP, "RADIUS SRV: " args) #define RADIUS_DUMP_ASCII(args...) \ wpa_hexdump_ascii(MSG_MSGDUMP, "RADIUS SRV: " args) static void radius_server_session_timeout(void *eloop_ctx, void *timeout_ctx); static void radius_server_session_remove_timeout(void *eloop_ctx, void *timeout_ctx); static struct radius_client * radius_server_get_client(struct radius_server_data *data, struct in_addr *addr, int ipv6) { struct radius_client *client = data->clients; while (client) { #ifdef CONFIG_IPV6 if (ipv6) { struct in6_addr *addr6; int i; addr6 = (struct in6_addr *) addr; for (i = 0; i < 16; i++) { if ((addr6->s6_addr[i] & client->mask6.s6_addr[i]) != (client->addr6.s6_addr[i] & client->mask6.s6_addr[i])) { i = 17; break; } } if (i == 16) { break; } } #endif /* CONFIG_IPV6 */ if (!ipv6 && (client->addr.s_addr & client->mask.s_addr) == (addr->s_addr & client->mask.s_addr)) { break; } client = client->next; } return client; } static struct radius_session * radius_server_get_session(struct radius_client *client, unsigned int sess_id) { struct radius_session *sess = client->sessions; while (sess) { if (sess->sess_id == sess_id) { break; } sess = sess->next; } return sess; } static void radius_server_session_free(struct radius_server_data *data, struct radius_session *sess) { eloop_cancel_timeout(radius_server_session_timeout, data, sess); eloop_cancel_timeout(radius_server_session_remove_timeout, data, sess); eap_server_sm_deinit(sess->eap); radius_msg_free(sess->last_msg); os_free(sess->last_from_addr); radius_msg_free(sess->last_reply); os_free(sess); data->num_sess--; } static void radius_server_session_remove(struct radius_server_data *data, struct radius_session *sess) { struct radius_client *client = sess->client; struct radius_session *session, *prev; eloop_cancel_timeout(radius_server_session_remove_timeout, data, sess); prev = NULL; session = client->sessions; while (session) { if (session == sess) { if (prev == NULL) { client->sessions = sess->next; } else { prev->next = sess->next; } radius_server_session_free(data, sess); break; } prev = session; session = session->next; } } static void radius_server_session_remove_timeout(void *eloop_ctx, void *timeout_ctx) { struct radius_server_data *data = eloop_ctx; struct radius_session *sess = timeout_ctx; RADIUS_DEBUG("Removing completed session 0x%x", sess->sess_id); radius_server_session_remove(data, sess); } static void radius_server_session_timeout(void *eloop_ctx, void *timeout_ctx) { struct radius_server_data *data = eloop_ctx; struct radius_session *sess = timeout_ctx; RADIUS_DEBUG("Timing out authentication session 0x%x", sess->sess_id); radius_server_session_remove(data, sess); } static struct radius_session * radius_server_new_session(struct radius_server_data *data, struct radius_client *client) { struct radius_session *sess; if (data->num_sess >= RADIUS_MAX_SESSION) { RADIUS_DEBUG("Maximum number of existing session - no room " "for a new session"); return NULL; } sess = os_zalloc(sizeof(*sess)); if (sess == NULL) return NULL; sess->server = data; sess->client = client; sess->sess_id = data->next_sess_id++; sess->next = client->sessions; client->sessions = sess; eloop_register_timeout(RADIUS_SESSION_TIMEOUT, 0, radius_server_session_timeout, data, sess); data->num_sess++; return sess; } static struct radius_session * radius_server_get_new_session(struct radius_server_data *data, struct radius_client *client, struct radius_msg *msg) { u8 *user; size_t user_len; int res; struct radius_session *sess; struct eap_config eap_conf; RADIUS_DEBUG("Creating a new session"); user = os_malloc(256); if (user == NULL) { return NULL; } res = radius_msg_get_attr(msg, RADIUS_ATTR_USER_NAME, user, 256); if (res < 0 || res > 256) { RADIUS_DEBUG("Could not get User-Name"); os_free(user); return NULL; } user_len = res; RADIUS_DUMP_ASCII("User-Name", user, user_len); res = data->get_eap_user(data->conf_ctx, user, user_len, 0, NULL); os_free(user); if (res == 0) { RADIUS_DEBUG("Matching user entry found"); sess = radius_server_new_session(data, client); if (sess == NULL) { RADIUS_DEBUG("Failed to create a new session"); return NULL; } } else { RADIUS_DEBUG("User-Name not found from user database"); return NULL; } os_memset(&eap_conf, 0, sizeof(eap_conf)); eap_conf.ssl_ctx = data->ssl_ctx; eap_conf.eap_sim_db_priv = data->eap_sim_db_priv; eap_conf.backend_auth = TRUE; eap_conf.eap_server = 1; eap_conf.pac_opaque_encr_key = data->pac_opaque_encr_key; eap_conf.eap_fast_a_id = data->eap_fast_a_id; eap_conf.eap_fast_a_id_len = data->eap_fast_a_id_len; eap_conf.eap_fast_a_id_info = data->eap_fast_a_id_info; eap_conf.eap_fast_prov = data->eap_fast_prov; eap_conf.pac_key_lifetime = data->pac_key_lifetime; eap_conf.pac_key_refresh_time = data->pac_key_refresh_time; eap_conf.eap_sim_aka_result_ind = data->eap_sim_aka_result_ind; eap_conf.tnc = data->tnc; eap_conf.wps = data->wps; sess->eap = eap_server_sm_init(sess, &radius_server_eapol_cb, &eap_conf); if (sess->eap == NULL) { RADIUS_DEBUG("Failed to initialize EAP state machine for the " "new session"); radius_server_session_free(data, sess); return NULL; } sess->eap_if = eap_get_interface(sess->eap); sess->eap_if->eapRestart = TRUE; sess->eap_if->portEnabled = TRUE; RADIUS_DEBUG("New session 0x%x initialized", sess->sess_id); return sess; } static struct radius_msg * radius_server_encapsulate_eap(struct radius_server_data *data, struct radius_client *client, struct radius_session *sess, struct radius_msg *request) { struct radius_msg *msg; int code; unsigned int sess_id; struct radius_hdr *hdr = radius_msg_get_hdr(request); if (sess->eap_if->eapFail) { sess->eap_if->eapFail = FALSE; code = RADIUS_CODE_ACCESS_REJECT; } else if (sess->eap_if->eapSuccess) { sess->eap_if->eapSuccess = FALSE; code = RADIUS_CODE_ACCESS_ACCEPT; } else { sess->eap_if->eapReq = FALSE; code = RADIUS_CODE_ACCESS_CHALLENGE; } msg = radius_msg_new(code, hdr->identifier); if (msg == NULL) { RADIUS_DEBUG("Failed to allocate reply message"); return NULL; } sess_id = htonl(sess->sess_id); if (code == RADIUS_CODE_ACCESS_CHALLENGE && !radius_msg_add_attr(msg, RADIUS_ATTR_STATE, (u8 *) &sess_id, sizeof(sess_id))) { RADIUS_DEBUG("Failed to add State attribute"); } if (sess->eap_if->eapReqData && !radius_msg_add_eap(msg, wpabuf_head(sess->eap_if->eapReqData), wpabuf_len(sess->eap_if->eapReqData))) { RADIUS_DEBUG("Failed to add EAP-Message attribute"); } if (code == RADIUS_CODE_ACCESS_ACCEPT && sess->eap_if->eapKeyData) { int len; if (sess->eap_if->eapKeyDataLen > 64) { len = 32; } else { len = sess->eap_if->eapKeyDataLen / 2; } if (!radius_msg_add_mppe_keys(msg, hdr->authenticator, (u8 *) client->shared_secret, client->shared_secret_len, sess->eap_if->eapKeyData + len, len, sess->eap_if->eapKeyData, len)) { RADIUS_DEBUG("Failed to add MPPE key attributes"); } } if (radius_msg_copy_attr(msg, request, RADIUS_ATTR_PROXY_STATE) < 0) { RADIUS_DEBUG("Failed to copy Proxy-State attribute(s)"); radius_msg_free(msg); return NULL; } if (radius_msg_finish_srv(msg, (u8 *) client->shared_secret, client->shared_secret_len, hdr->authenticator) < 0) { RADIUS_DEBUG("Failed to add Message-Authenticator attribute"); } return msg; } static int radius_server_reject(struct radius_server_data *data, struct radius_client *client, struct radius_msg *request, struct sockaddr *from, socklen_t fromlen, const char *from_addr, int from_port) { struct radius_msg *msg; int ret = 0; struct eap_hdr eapfail; struct wpabuf *buf; struct radius_hdr *hdr = radius_msg_get_hdr(request); RADIUS_DEBUG("Reject invalid request from %s:%d", from_addr, from_port); msg = radius_msg_new(RADIUS_CODE_ACCESS_REJECT, hdr->identifier); if (msg == NULL) { return -1; } os_memset(&eapfail, 0, sizeof(eapfail)); eapfail.code = EAP_CODE_FAILURE; eapfail.identifier = 0; eapfail.length = host_to_be16(sizeof(eapfail)); if (!radius_msg_add_eap(msg, (u8 *) &eapfail, sizeof(eapfail))) { RADIUS_DEBUG("Failed to add EAP-Message attribute"); } if (radius_msg_copy_attr(msg, request, RADIUS_ATTR_PROXY_STATE) < 0) { RADIUS_DEBUG("Failed to copy Proxy-State attribute(s)"); radius_msg_free(msg); return -1; } if (radius_msg_finish_srv(msg, (u8 *) client->shared_secret, client->shared_secret_len, hdr->authenticator) < 0) { RADIUS_DEBUG("Failed to add Message-Authenticator attribute"); } if (wpa_debug_level <= MSG_MSGDUMP) { radius_msg_dump(msg); } data->counters.access_rejects++; client->counters.access_rejects++; buf = radius_msg_get_buf(msg); if (sendto(data->auth_sock, wpabuf_head(buf), wpabuf_len(buf), 0, (struct sockaddr *) from, sizeof(*from)) < 0) { perror("sendto[RADIUS SRV]"); ret = -1; } radius_msg_free(msg); return ret; } static int radius_server_request(struct radius_server_data *data, struct radius_msg *msg, struct sockaddr *from, socklen_t fromlen, struct radius_client *client, const char *from_addr, int from_port, struct radius_session *force_sess) { u8 *eap = NULL; size_t eap_len; int res, state_included = 0; u8 statebuf[4]; unsigned int state; struct radius_session *sess; struct radius_msg *reply; int is_complete = 0; if (force_sess) sess = force_sess; else { res = radius_msg_get_attr(msg, RADIUS_ATTR_STATE, statebuf, sizeof(statebuf)); state_included = res >= 0; if (res == sizeof(statebuf)) { state = WPA_GET_BE32(statebuf); sess = radius_server_get_session(client, state); } else { sess = NULL; } } if (sess) { RADIUS_DEBUG("Request for session 0x%x", sess->sess_id); } else if (state_included) { RADIUS_DEBUG("State attribute included but no session found"); radius_server_reject(data, client, msg, from, fromlen, from_addr, from_port); return -1; } else { sess = radius_server_get_new_session(data, client, msg); if (sess == NULL) { RADIUS_DEBUG("Could not create a new session"); radius_server_reject(data, client, msg, from, fromlen, from_addr, from_port); return -1; } } if (sess->last_from_port == from_port && sess->last_identifier == radius_msg_get_hdr(msg)->identifier && os_memcmp(sess->last_authenticator, radius_msg_get_hdr(msg)->authenticator, 16) == 0) { RADIUS_DEBUG("Duplicate message from %s", from_addr); data->counters.dup_access_requests++; client->counters.dup_access_requests++; if (sess->last_reply) { struct wpabuf *buf; buf = radius_msg_get_buf(sess->last_reply); res = sendto(data->auth_sock, wpabuf_head(buf), wpabuf_len(buf), 0, (struct sockaddr *) from, fromlen); if (res < 0) { perror("sendto[RADIUS SRV]"); } return 0; } RADIUS_DEBUG("No previous reply available for duplicate " "message"); return -1; } eap = radius_msg_get_eap(msg, &eap_len); if (eap == NULL) { RADIUS_DEBUG("No EAP-Message in RADIUS packet from %s", from_addr); data->counters.packets_dropped++; client->counters.packets_dropped++; return -1; } RADIUS_DUMP("Received EAP data", eap, eap_len); /* FIX: if Code is Request, Success, or Failure, send Access-Reject; * RFC3579 Sect. 2.6.2. * Include EAP-Response/Nak with no preferred method if * code == request. * If code is not 1-4, discard the packet silently. * Or is this already done by the EAP state machine? */ wpabuf_free(sess->eap_if->eapRespData); sess->eap_if->eapRespData = wpabuf_alloc_ext_data(eap, eap_len); if (sess->eap_if->eapRespData == NULL) os_free(eap); eap = NULL; sess->eap_if->eapResp = TRUE; eap_server_sm_step(sess->eap); if ((sess->eap_if->eapReq || sess->eap_if->eapSuccess || sess->eap_if->eapFail) && sess->eap_if->eapReqData) { RADIUS_DUMP("EAP data from the state machine", wpabuf_head(sess->eap_if->eapReqData), wpabuf_len(sess->eap_if->eapReqData)); } else if (sess->eap_if->eapFail) { RADIUS_DEBUG("No EAP data from the state machine, but eapFail " "set"); } else if (eap_sm_method_pending(sess->eap)) { radius_msg_free(sess->last_msg); sess->last_msg = msg; sess->last_from_port = from_port; os_free(sess->last_from_addr); sess->last_from_addr = os_strdup(from_addr); sess->last_fromlen = fromlen; os_memcpy(&sess->last_from, from, fromlen); return -2; } else { RADIUS_DEBUG("No EAP data from the state machine - ignore this" " Access-Request silently (assuming it was a " "duplicate)"); data->counters.packets_dropped++; client->counters.packets_dropped++; return -1; } if (sess->eap_if->eapSuccess || sess->eap_if->eapFail) is_complete = 1; reply = radius_server_encapsulate_eap(data, client, sess, msg); if (reply) { struct wpabuf *buf; struct radius_hdr *hdr; RADIUS_DEBUG("Reply to %s:%d", from_addr, from_port); if (wpa_debug_level <= MSG_MSGDUMP) { radius_msg_dump(reply); } switch (radius_msg_get_hdr(reply)->code) { case RADIUS_CODE_ACCESS_ACCEPT: data->counters.access_accepts++; client->counters.access_accepts++; break; case RADIUS_CODE_ACCESS_REJECT: data->counters.access_rejects++; client->counters.access_rejects++; break; case RADIUS_CODE_ACCESS_CHALLENGE: data->counters.access_challenges++; client->counters.access_challenges++; break; } buf = radius_msg_get_buf(reply); res = sendto(data->auth_sock, wpabuf_head(buf), wpabuf_len(buf), 0, (struct sockaddr *) from, fromlen); if (res < 0) { perror("sendto[RADIUS SRV]"); } radius_msg_free(sess->last_reply); sess->last_reply = reply; sess->last_from_port = from_port; hdr = radius_msg_get_hdr(msg); sess->last_identifier = hdr->identifier; os_memcpy(sess->last_authenticator, hdr->authenticator, 16); } else { data->counters.packets_dropped++; client->counters.packets_dropped++; } if (is_complete) { RADIUS_DEBUG("Removing completed session 0x%x after timeout", sess->sess_id); eloop_cancel_timeout(radius_server_session_remove_timeout, data, sess); eloop_register_timeout(10, 0, radius_server_session_remove_timeout, data, sess); } return 0; } static void radius_server_receive_auth(int sock, void *eloop_ctx, void *sock_ctx) { struct radius_server_data *data = eloop_ctx; u8 *buf = NULL; union { struct sockaddr_storage ss; struct sockaddr_in sin; #ifdef CONFIG_IPV6 struct sockaddr_in6 sin6; #endif /* CONFIG_IPV6 */ } from; socklen_t fromlen; int len; struct radius_client *client = NULL; struct radius_msg *msg = NULL; char abuf[50]; int from_port = 0; buf = os_malloc(RADIUS_MAX_MSG_LEN); if (buf == NULL) { goto fail; } fromlen = sizeof(from); len = recvfrom(sock, buf, RADIUS_MAX_MSG_LEN, 0, (struct sockaddr *) &from.ss, &fromlen); if (len < 0) { perror("recvfrom[radius_server]"); goto fail; } #ifdef CONFIG_IPV6 if (data->ipv6) { if (inet_ntop(AF_INET6, &from.sin6.sin6_addr, abuf, sizeof(abuf)) == NULL) abuf[0] = '\0'; from_port = ntohs(from.sin6.sin6_port); RADIUS_DEBUG("Received %d bytes from %s:%d", len, abuf, from_port); client = radius_server_get_client(data, (struct in_addr *) &from.sin6.sin6_addr, 1); } #endif /* CONFIG_IPV6 */ if (!data->ipv6) { os_strlcpy(abuf, inet_ntoa(from.sin.sin_addr), sizeof(abuf)); from_port = ntohs(from.sin.sin_port); RADIUS_DEBUG("Received %d bytes from %s:%d", len, abuf, from_port); client = radius_server_get_client(data, &from.sin.sin_addr, 0); } RADIUS_DUMP("Received data", buf, len); if (client == NULL) { RADIUS_DEBUG("Unknown client %s - packet ignored", abuf); data->counters.invalid_requests++; goto fail; } msg = radius_msg_parse(buf, len); if (msg == NULL) { RADIUS_DEBUG("Parsing incoming RADIUS frame failed"); data->counters.malformed_access_requests++; client->counters.malformed_access_requests++; goto fail; } os_free(buf); buf = NULL; if (wpa_debug_level <= MSG_MSGDUMP) { radius_msg_dump(msg); } if (radius_msg_get_hdr(msg)->code != RADIUS_CODE_ACCESS_REQUEST) { RADIUS_DEBUG("Unexpected RADIUS code %d", radius_msg_get_hdr(msg)->code); data->counters.unknown_types++; client->counters.unknown_types++; goto fail; } data->counters.access_requests++; client->counters.access_requests++; if (radius_msg_verify_msg_auth(msg, (u8 *) client->shared_secret, client->shared_secret_len, NULL)) { RADIUS_DEBUG("Invalid Message-Authenticator from %s", abuf); data->counters.bad_authenticators++; client->counters.bad_authenticators++; goto fail; } if (radius_server_request(data, msg, (struct sockaddr *) &from, fromlen, client, abuf, from_port, NULL) == -2) return; /* msg was stored with the session */ fail: radius_msg_free(msg); os_free(buf); } static int radius_server_disable_pmtu_discovery(int s) { int r = -1; #if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT) /* Turn off Path MTU discovery on IPv4/UDP sockets. */ int action = IP_PMTUDISC_DONT; r = setsockopt(s, IPPROTO_IP, IP_MTU_DISCOVER, &action, sizeof(action)); if (r == -1) wpa_printf(MSG_ERROR, "Failed to set IP_MTU_DISCOVER: " "%s", strerror(errno)); #endif return r; } static int radius_server_open_socket(int port) { int s; struct sockaddr_in addr; s = socket(PF_INET, SOCK_DGRAM, 0); if (s < 0) { perror("socket"); return -1; } radius_server_disable_pmtu_discovery(s); os_memset(&addr, 0, sizeof(addr)); addr.sin_family = AF_INET; addr.sin_port = htons(port); if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) { perror("bind"); close(s); return -1; } return s; } #ifdef CONFIG_IPV6 static int radius_server_open_socket6(int port) { int s; struct sockaddr_in6 addr; s = socket(PF_INET6, SOCK_DGRAM, 0); if (s < 0) { perror("socket[IPv6]"); return -1; } os_memset(&addr, 0, sizeof(addr)); addr.sin6_family = AF_INET6; os_memcpy(&addr.sin6_addr, &in6addr_any, sizeof(in6addr_any)); addr.sin6_port = htons(port); if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) { perror("bind"); close(s); return -1; } return s; } #endif /* CONFIG_IPV6 */ static void radius_server_free_sessions(struct radius_server_data *data, struct radius_session *sessions) { struct radius_session *session, *prev; session = sessions; while (session) { prev = session; session = session->next; radius_server_session_free(data, prev); } } static void radius_server_free_clients(struct radius_server_data *data, struct radius_client *clients) { struct radius_client *client, *prev; client = clients; while (client) { prev = client; client = client->next; radius_server_free_sessions(data, prev->sessions); os_free(prev->shared_secret); os_free(prev); } } static struct radius_client * radius_server_read_clients(const char *client_file, int ipv6) { FILE *f; const int buf_size = 1024; char *buf, *pos; struct radius_client *clients, *tail, *entry; int line = 0, mask, failed = 0, i; struct in_addr addr; #ifdef CONFIG_IPV6 struct in6_addr addr6; #endif /* CONFIG_IPV6 */ unsigned int val; f = fopen(client_file, "r"); if (f == NULL) { RADIUS_ERROR("Could not open client file '%s'", client_file); return NULL; } buf = os_malloc(buf_size); if (buf == NULL) { fclose(f); return NULL; } clients = tail = NULL; while (fgets(buf, buf_size, f)) { /* Configuration file format: * 192.168.1.0/24 secret * 192.168.1.2 secret * fe80::211:22ff:fe33:4455/64 secretipv6 */ line++; buf[buf_size - 1] = '\0'; pos = buf; while (*pos != '\0' && *pos != '\n') pos++; if (*pos == '\n') *pos = '\0'; if (*buf == '\0' || *buf == '#') continue; pos = buf; while ((*pos >= '0' && *pos <= '9') || *pos == '.' || (*pos >= 'a' && *pos <= 'f') || *pos == ':' || (*pos >= 'A' && *pos <= 'F')) { pos++; } if (*pos == '\0') { failed = 1; break; } if (*pos == '/') { char *end; *pos++ = '\0'; mask = strtol(pos, &end, 10); if ((pos == end) || (mask < 0 || mask > (ipv6 ? 128 : 32))) { failed = 1; break; } pos = end; } else { mask = ipv6 ? 128 : 32; *pos++ = '\0'; } if (!ipv6 && inet_aton(buf, &addr) == 0) { failed = 1; break; } #ifdef CONFIG_IPV6 if (ipv6 && inet_pton(AF_INET6, buf, &addr6) <= 0) { if (inet_pton(AF_INET, buf, &addr) <= 0) { failed = 1; break; } /* Convert IPv4 address to IPv6 */ if (mask <= 32) mask += (128 - 32); os_memset(addr6.s6_addr, 0, 10); addr6.s6_addr[10] = 0xff; addr6.s6_addr[11] = 0xff; os_memcpy(addr6.s6_addr + 12, (char *) &addr.s_addr, 4); } #endif /* CONFIG_IPV6 */ while (*pos == ' ' || *pos == '\t') { pos++; } if (*pos == '\0') { failed = 1; break; } entry = os_zalloc(sizeof(*entry)); if (entry == NULL) { failed = 1; break; } entry->shared_secret = os_strdup(pos); if (entry->shared_secret == NULL) { failed = 1; os_free(entry); break; } entry->shared_secret_len = os_strlen(entry->shared_secret); entry->addr.s_addr = addr.s_addr; if (!ipv6) { val = 0; for (i = 0; i < mask; i++) val |= 1 << (31 - i); entry->mask.s_addr = htonl(val); } #ifdef CONFIG_IPV6 if (ipv6) { int offset = mask / 8; os_memcpy(entry->addr6.s6_addr, addr6.s6_addr, 16); os_memset(entry->mask6.s6_addr, 0xff, offset); val = 0; for (i = 0; i < (mask % 8); i++) val |= 1 << (7 - i); if (offset < 16) entry->mask6.s6_addr[offset] = val; } #endif /* CONFIG_IPV6 */ if (tail == NULL) { clients = tail = entry; } else { tail->next = entry; tail = entry; } } if (failed) { RADIUS_ERROR("Invalid line %d in '%s'", line, client_file); radius_server_free_clients(NULL, clients); clients = NULL; } os_free(buf); fclose(f); return clients; } /** * radius_server_init - Initialize RADIUS server * @conf: Configuration for the RADIUS server * Returns: Pointer to private RADIUS server context or %NULL on failure * * This initializes a RADIUS server instance and returns a context pointer that * will be used in other calls to the RADIUS server module. The server can be * deinitialize by calling radius_server_deinit(). */ struct radius_server_data * radius_server_init(struct radius_server_conf *conf) { struct radius_server_data *data; #ifndef CONFIG_IPV6 if (conf->ipv6) { fprintf(stderr, "RADIUS server compiled without IPv6 " "support.\n"); return NULL; } #endif /* CONFIG_IPV6 */ data = os_zalloc(sizeof(*data)); if (data == NULL) return NULL; os_get_time(&data->start_time); data->conf_ctx = conf->conf_ctx; data->eap_sim_db_priv = conf->eap_sim_db_priv; data->ssl_ctx = conf->ssl_ctx; data->ipv6 = conf->ipv6; if (conf->pac_opaque_encr_key) { data->pac_opaque_encr_key = os_malloc(16); os_memcpy(data->pac_opaque_encr_key, conf->pac_opaque_encr_key, 16); } if (conf->eap_fast_a_id) { data->eap_fast_a_id = os_malloc(conf->eap_fast_a_id_len); if (data->eap_fast_a_id) { os_memcpy(data->eap_fast_a_id, conf->eap_fast_a_id, conf->eap_fast_a_id_len); data->eap_fast_a_id_len = conf->eap_fast_a_id_len; } } if (conf->eap_fast_a_id_info) data->eap_fast_a_id_info = os_strdup(conf->eap_fast_a_id_info); data->eap_fast_prov = conf->eap_fast_prov; data->pac_key_lifetime = conf->pac_key_lifetime; data->pac_key_refresh_time = conf->pac_key_refresh_time; data->get_eap_user = conf->get_eap_user; data->eap_sim_aka_result_ind = conf->eap_sim_aka_result_ind; data->tnc = conf->tnc; data->wps = conf->wps; if (conf->eap_req_id_text) { data->eap_req_id_text = os_malloc(conf->eap_req_id_text_len); if (data->eap_req_id_text) { os_memcpy(data->eap_req_id_text, conf->eap_req_id_text, conf->eap_req_id_text_len); data->eap_req_id_text_len = conf->eap_req_id_text_len; } } data->clients = radius_server_read_clients(conf->client_file, conf->ipv6); if (data->clients == NULL) { printf("No RADIUS clients configured.\n"); radius_server_deinit(data); return NULL; } #ifdef CONFIG_IPV6 if (conf->ipv6) data->auth_sock = radius_server_open_socket6(conf->auth_port); else #endif /* CONFIG_IPV6 */ data->auth_sock = radius_server_open_socket(conf->auth_port); if (data->auth_sock < 0) { printf("Failed to open UDP socket for RADIUS authentication " "server\n"); radius_server_deinit(data); return NULL; } if (eloop_register_read_sock(data->auth_sock, radius_server_receive_auth, data, NULL)) { radius_server_deinit(data); return NULL; } return data; } /** * radius_server_deinit - Deinitialize RADIUS server * @data: RADIUS server context from radius_server_init() */ void radius_server_deinit(struct radius_server_data *data) { if (data == NULL) return; if (data->auth_sock >= 0) { eloop_unregister_read_sock(data->auth_sock); close(data->auth_sock); } radius_server_free_clients(data, data->clients); os_free(data->pac_opaque_encr_key); os_free(data->eap_fast_a_id); os_free(data->eap_fast_a_id_info); os_free(data->eap_req_id_text); os_free(data); } /** * radius_server_get_mib - Get RADIUS server MIB information * @data: RADIUS server context from radius_server_init() * @buf: Buffer for returning the MIB data in text format * @buflen: buf length in octets * Returns: Number of octets written into buf */ int radius_server_get_mib(struct radius_server_data *data, char *buf, size_t buflen) { int ret, uptime; unsigned int idx; char *end, *pos; struct os_time now; struct radius_client *cli; /* RFC 2619 - RADIUS Authentication Server MIB */ if (data == NULL || buflen == 0) return 0; pos = buf; end = buf + buflen; os_get_time(&now); uptime = (now.sec - data->start_time.sec) * 100 + ((now.usec - data->start_time.usec) / 10000) % 100; ret = os_snprintf(pos, end - pos, "RADIUS-AUTH-SERVER-MIB\n" "radiusAuthServIdent=hostapd\n" "radiusAuthServUpTime=%d\n" "radiusAuthServResetTime=0\n" "radiusAuthServConfigReset=4\n", uptime); if (ret < 0 || ret >= end - pos) { *pos = '\0'; return pos - buf; } pos += ret; ret = os_snprintf(pos, end - pos, "radiusAuthServTotalAccessRequests=%u\n" "radiusAuthServTotalInvalidRequests=%u\n" "radiusAuthServTotalDupAccessRequests=%u\n" "radiusAuthServTotalAccessAccepts=%u\n" "radiusAuthServTotalAccessRejects=%u\n" "radiusAuthServTotalAccessChallenges=%u\n" "radiusAuthServTotalMalformedAccessRequests=%u\n" "radiusAuthServTotalBadAuthenticators=%u\n" "radiusAuthServTotalPacketsDropped=%u\n" "radiusAuthServTotalUnknownTypes=%u\n", data->counters.access_requests, data->counters.invalid_requests, data->counters.dup_access_requests, data->counters.access_accepts, data->counters.access_rejects, data->counters.access_challenges, data->counters.malformed_access_requests, data->counters.bad_authenticators, data->counters.packets_dropped, data->counters.unknown_types); if (ret < 0 || ret >= end - pos) { *pos = '\0'; return pos - buf; } pos += ret; for (cli = data->clients, idx = 0; cli; cli = cli->next, idx++) { char abuf[50], mbuf[50]; #ifdef CONFIG_IPV6 if (data->ipv6) { if (inet_ntop(AF_INET6, &cli->addr6, abuf, sizeof(abuf)) == NULL) abuf[0] = '\0'; if (inet_ntop(AF_INET6, &cli->mask6, abuf, sizeof(mbuf)) == NULL) mbuf[0] = '\0'; } #endif /* CONFIG_IPV6 */ if (!data->ipv6) { os_strlcpy(abuf, inet_ntoa(cli->addr), sizeof(abuf)); os_strlcpy(mbuf, inet_ntoa(cli->mask), sizeof(mbuf)); } ret = os_snprintf(pos, end - pos, "radiusAuthClientIndex=%u\n" "radiusAuthClientAddress=%s/%s\n" "radiusAuthServAccessRequests=%u\n" "radiusAuthServDupAccessRequests=%u\n" "radiusAuthServAccessAccepts=%u\n" "radiusAuthServAccessRejects=%u\n" "radiusAuthServAccessChallenges=%u\n" "radiusAuthServMalformedAccessRequests=%u\n" "radiusAuthServBadAuthenticators=%u\n" "radiusAuthServPacketsDropped=%u\n" "radiusAuthServUnknownTypes=%u\n", idx, abuf, mbuf, cli->counters.access_requests, cli->counters.dup_access_requests, cli->counters.access_accepts, cli->counters.access_rejects, cli->counters.access_challenges, cli->counters.malformed_access_requests, cli->counters.bad_authenticators, cli->counters.packets_dropped, cli->counters.unknown_types); if (ret < 0 || ret >= end - pos) { *pos = '\0'; return pos - buf; } pos += ret; } return pos - buf; } static int radius_server_get_eap_user(void *ctx, const u8 *identity, size_t identity_len, int phase2, struct eap_user *user) { struct radius_session *sess = ctx; struct radius_server_data *data = sess->server; return data->get_eap_user(data->conf_ctx, identity, identity_len, phase2, user); } static const char * radius_server_get_eap_req_id_text(void *ctx, size_t *len) { struct radius_session *sess = ctx; struct radius_server_data *data = sess->server; *len = data->eap_req_id_text_len; return data->eap_req_id_text; } static struct eapol_callbacks radius_server_eapol_cb = { .get_eap_user = radius_server_get_eap_user, .get_eap_req_id_text = radius_server_get_eap_req_id_text, }; /** * radius_server_eap_pending_cb - Pending EAP data notification * @data: RADIUS server context from radius_server_init() * @ctx: Pending EAP context pointer * * This function is used to notify EAP server module that a pending operation * has been completed and processing of the EAP session can proceed. */ void radius_server_eap_pending_cb(struct radius_server_data *data, void *ctx) { struct radius_client *cli; struct radius_session *s, *sess = NULL; struct radius_msg *msg; if (data == NULL) return; for (cli = data->clients; cli; cli = cli->next) { for (s = cli->sessions; s; s = s->next) { if (s->eap == ctx && s->last_msg) { sess = s; break; } if (sess) break; } if (sess) break; } if (sess == NULL) { RADIUS_DEBUG("No session matched callback ctx"); return; } msg = sess->last_msg; sess->last_msg = NULL; eap_sm_pending_cb(sess->eap); if (radius_server_request(data, msg, (struct sockaddr *) &sess->last_from, sess->last_fromlen, cli, sess->last_from_addr, sess->last_from_port, sess) == -2) return; /* msg was stored with the session */ radius_msg_free(msg); }