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This EAP type uses a vendor specific expanded EAP header to encapsulate EAP-TLS with a configuration where the EAP server does not authenticate the EAP peer. In other words, this method includes only server authentication. The peer is configured with only the ca_cert parameter (similarly to other TLS-based EAP methods). This method can be used for cases where the network provides free access to anyone, but use of RSN with a securely derived unique PMK for each station is desired. The expanded EAP header uses the hostapd/wpa_supplicant vendor code 39068 and vendor type 1 to identify the UNAUTH-TLS method. Signed-hostap: Jouni Malinen <j@w1.fi>
129 lines
3.6 KiB
C
129 lines
3.6 KiB
C
/*
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* EAP peer: EAP-TLS/PEAP/TTLS/FAST common functions
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* Copyright (c) 2004-2009, 2012, Jouni Malinen <j@w1.fi>
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#ifndef EAP_TLS_COMMON_H
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#define EAP_TLS_COMMON_H
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/**
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* struct eap_ssl_data - TLS data for EAP methods
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*/
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struct eap_ssl_data {
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/**
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* conn - TLS connection context data from tls_connection_init()
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*/
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struct tls_connection *conn;
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/**
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* tls_out - TLS message to be sent out in fragments
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*/
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struct wpabuf *tls_out;
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/**
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* tls_out_pos - The current position in the outgoing TLS message
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*/
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size_t tls_out_pos;
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/**
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* tls_out_limit - Maximum fragment size for outgoing TLS messages
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*/
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size_t tls_out_limit;
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/**
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* tls_in - Received TLS message buffer for re-assembly
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*/
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struct wpabuf *tls_in;
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/**
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* tls_in_left - Number of remaining bytes in the incoming TLS message
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*/
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size_t tls_in_left;
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/**
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* tls_in_total - Total number of bytes in the incoming TLS message
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*/
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size_t tls_in_total;
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/**
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* phase2 - Whether this TLS connection is used in EAP phase 2 (tunnel)
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*/
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int phase2;
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/**
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* include_tls_length - Whether the TLS length field is included even
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* if the TLS data is not fragmented
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*/
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int include_tls_length;
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/**
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* eap - EAP state machine allocated with eap_peer_sm_init()
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*/
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struct eap_sm *eap;
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/**
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* ssl_ctx - TLS library context to use for the connection
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*/
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void *ssl_ctx;
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/**
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* eap_type - EAP method used in Phase 1 (EAP_TYPE_TLS/PEAP/TTLS/FAST)
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*/
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u8 eap_type;
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};
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/* EAP TLS Flags */
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#define EAP_TLS_FLAGS_LENGTH_INCLUDED 0x80
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#define EAP_TLS_FLAGS_MORE_FRAGMENTS 0x40
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#define EAP_TLS_FLAGS_START 0x20
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#define EAP_TLS_VERSION_MASK 0x07
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/* could be up to 128 bytes, but only the first 64 bytes are used */
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#define EAP_TLS_KEY_LEN 64
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/* dummy type used as a flag for UNAUTH-TLS */
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#define EAP_UNAUTH_TLS_TYPE 255
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int eap_peer_tls_ssl_init(struct eap_sm *sm, struct eap_ssl_data *data,
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struct eap_peer_config *config, u8 eap_type);
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void eap_peer_tls_ssl_deinit(struct eap_sm *sm, struct eap_ssl_data *data);
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u8 * eap_peer_tls_derive_key(struct eap_sm *sm, struct eap_ssl_data *data,
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const char *label, size_t len);
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int eap_peer_tls_process_helper(struct eap_sm *sm, struct eap_ssl_data *data,
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EapType eap_type, int peap_version,
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u8 id, const u8 *in_data, size_t in_len,
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struct wpabuf **out_data);
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struct wpabuf * eap_peer_tls_build_ack(u8 id, EapType eap_type,
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int peap_version);
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int eap_peer_tls_reauth_init(struct eap_sm *sm, struct eap_ssl_data *data);
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int eap_peer_tls_status(struct eap_sm *sm, struct eap_ssl_data *data,
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char *buf, size_t buflen, int verbose);
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const u8 * eap_peer_tls_process_init(struct eap_sm *sm,
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struct eap_ssl_data *data,
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EapType eap_type,
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struct eap_method_ret *ret,
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const struct wpabuf *reqData,
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size_t *len, u8 *flags);
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void eap_peer_tls_reset_input(struct eap_ssl_data *data);
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void eap_peer_tls_reset_output(struct eap_ssl_data *data);
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int eap_peer_tls_decrypt(struct eap_sm *sm, struct eap_ssl_data *data,
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const struct wpabuf *in_data,
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struct wpabuf **in_decrypted);
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int eap_peer_tls_encrypt(struct eap_sm *sm, struct eap_ssl_data *data,
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EapType eap_type, int peap_version, u8 id,
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const struct wpabuf *in_data,
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struct wpabuf **out_data);
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int eap_peer_select_phase2_methods(struct eap_peer_config *config,
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const char *prefix,
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struct eap_method_type **types,
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size_t *num_types);
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int eap_peer_tls_phase2_nak(struct eap_method_type *types, size_t num_types,
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struct eap_hdr *hdr, struct wpabuf **resp);
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#endif /* EAP_TLS_COMMON_H */
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