/*
* EAP peer: EAP-TLS/PEAP/TTLS/FAST common functions
* Copyright (c) 2004-2013, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
#include "crypto/sha1.h"
#include "crypto/tls.h"
#include "eap_i.h"
#include "eap_tls_common.h"
#include "eap_config.h"
static struct wpabuf * eap_tls_msg_alloc(EapType type, size_t payload_len,
u8 code, u8 identifier)
{
if (type == EAP_UNAUTH_TLS_TYPE)
return eap_msg_alloc(EAP_VENDOR_UNAUTH_TLS,
EAP_VENDOR_TYPE_UNAUTH_TLS, payload_len,
code, identifier);
if (type == EAP_WFA_UNAUTH_TLS_TYPE)
return eap_msg_alloc(EAP_VENDOR_WFA_NEW,
EAP_VENDOR_WFA_UNAUTH_TLS, payload_len,
code, identifier);
return eap_msg_alloc(EAP_VENDOR_IETF, type, payload_len, code,
identifier);
}
static int eap_tls_check_blob(struct eap_sm *sm, const char **name,
const u8 **data, size_t *data_len)
{
const struct wpa_config_blob *blob;
if (*name == NULL || os_strncmp(*name, "blob://", 7) != 0)
return 0;
blob = eap_get_config_blob(sm, *name + 7);
if (blob == NULL) {
wpa_printf(MSG_ERROR, "%s: Named configuration blob '%s' not "
"found", __func__, *name + 7);
return -1;
}
*name = NULL;
*data = blob->data;
*data_len = blob->len;
return 0;
}
static void eap_tls_params_flags(struct tls_connection_params *params,
const char *txt)
{
if (txt == NULL)
return;
if (os_strstr(txt, "tls_allow_md5=1"))
params->flags |= TLS_CONN_ALLOW_SIGN_RSA_MD5;
if (os_strstr(txt, "tls_disable_time_checks=1"))
params->flags |= TLS_CONN_DISABLE_TIME_CHECKS;
if (os_strstr(txt, "tls_disable_session_ticket=1"))
params->flags |= TLS_CONN_DISABLE_SESSION_TICKET;
if (os_strstr(txt, "tls_disable_session_ticket=0"))
params->flags &= ~TLS_CONN_DISABLE_SESSION_TICKET;
if (os_strstr(txt, "tls_disable_tlsv1_0=1"))
params->flags |= TLS_CONN_DISABLE_TLSv1_0;
if (os_strstr(txt, "tls_disable_tlsv1_0=0"))
params->flags &= ~TLS_CONN_DISABLE_TLSv1_0;
if (os_strstr(txt, "tls_disable_tlsv1_1=1"))
params->flags |= TLS_CONN_DISABLE_TLSv1_1;
if (os_strstr(txt, "tls_disable_tlsv1_1=0"))
params->flags &= ~TLS_CONN_DISABLE_TLSv1_1;
if (os_strstr(txt, "tls_disable_tlsv1_2=1"))
params->flags |= TLS_CONN_DISABLE_TLSv1_2;
if (os_strstr(txt, "tls_disable_tlsv1_2=0"))
params->flags &= ~TLS_CONN_DISABLE_TLSv1_2;
if (os_strstr(txt, "tls_disable_tlsv1_3=1"))
params->flags |= TLS_CONN_DISABLE_TLSv1_3;
if (os_strstr(txt, "tls_disable_tlsv1_3=0"))
params->flags &= ~TLS_CONN_DISABLE_TLSv1_3;
if (os_strstr(txt, "tls_ext_cert_check=1"))
params->flags |= TLS_CONN_EXT_CERT_CHECK;
if (os_strstr(txt, "tls_ext_cert_check=0"))
params->flags &= ~TLS_CONN_EXT_CERT_CHECK;
if (os_strstr(txt, "tls_suiteb=1"))
params->flags |= TLS_CONN_SUITEB;
if (os_strstr(txt, "tls_suiteb=0"))
params->flags &= ~TLS_CONN_SUITEB;
if (os_strstr(txt, "tls_suiteb_no_ecdh=1"))
params->flags |= TLS_CONN_SUITEB_NO_ECDH;
if (os_strstr(txt, "tls_suiteb_no_ecdh=0"))
params->flags &= ~TLS_CONN_SUITEB_NO_ECDH;
}
static void eap_tls_params_from_conf1(struct tls_connection_params *params,
struct eap_peer_config *config)
{
params->ca_cert = (char *) config->ca_cert;
params->ca_path = (char *) config->ca_path;
params->client_cert = (char *) config->client_cert;
params->private_key = (char *) config->private_key;
params->private_key_passwd = (char *) config->private_key_passwd;
params->dh_file = (char *) config->dh_file;
params->subject_match = (char *) config->subject_match;
params->altsubject_match = (char *) config->altsubject_match;
params->suffix_match = config->domain_suffix_match;
params->domain_match = config->domain_match;
params->engine = config->engine;
params->engine_id = config->engine_id;
params->pin = config->pin;
params->key_id = config->key_id;
params->cert_id = config->cert_id;
params->ca_cert_id = config->ca_cert_id;
eap_tls_params_flags(params, config->phase1);
}
static void eap_tls_params_from_conf2(struct tls_connection_params *params,
struct eap_peer_config *config)
{
params->ca_cert = (char *) config->ca_cert2;
params->ca_path = (char *) config->ca_path2;
params->client_cert = (char *) config->client_cert2;
params->private_key = (char *) config->private_key2;
params->private_key_passwd = (char *) config->private_key2_passwd;
params->dh_file = (char *) config->dh_file2;
params->subject_match = (char *) config->subject_match2;
params->altsubject_match = (char *) config->altsubject_match2;
params->suffix_match = config->domain_suffix_match2;
params->domain_match = config->domain_match2;
params->engine = config->engine2;
params->engine_id = config->engine2_id;
params->pin = config->pin2;
params->key_id = config->key2_id;
params->cert_id = config->cert2_id;
params->ca_cert_id = config->ca_cert2_id;
eap_tls_params_flags(params, config->phase2);
}
static int eap_tls_params_from_conf(struct eap_sm *sm,
struct eap_ssl_data *data,
struct tls_connection_params *params,
struct eap_peer_config *config, int phase2)
{
os_memset(params, 0, sizeof(*params));
if (sm->workaround && data->eap_type != EAP_TYPE_FAST) {
/*
* Some deployed authentication servers seem to be unable to
* handle the TLS Session Ticket extension (they are supposed
* to ignore unrecognized TLS extensions, but end up rejecting
* the ClientHello instead). As a workaround, disable use of
* TLS Sesson Ticket extension for EAP-TLS, EAP-PEAP, and
* EAP-TTLS (EAP-FAST uses session ticket, so any server that
* supports EAP-FAST does not need this workaround).
*/
params->flags |= TLS_CONN_DISABLE_SESSION_TICKET;
}
if (data->eap_type == EAP_TYPE_FAST ||
data->eap_type == EAP_TYPE_TTLS ||
data->eap_type == EAP_TYPE_PEAP) {
/* The current EAP peer implementation is not yet ready for the
* TLS v1.3 changes, so disable this by default for now. */
params->flags |= TLS_CONN_DISABLE_TLSv1_3;
}
if (data->eap_type == EAP_TYPE_TLS) {
/* While the current EAP-TLS implementation is more or less
* complete for TLS v1.3, there has been no interoperability
* testing with other implementations, so disable for by default
* for now until there has been chance to confirm that no
* significant interoperability issues show up with TLS version
* update.
*/
params->flags |= TLS_CONN_DISABLE_TLSv1_3;
}
if (phase2) {
wpa_printf(MSG_DEBUG, "TLS: using phase2 config options");
eap_tls_params_from_conf2(params, config);
} else {
wpa_printf(MSG_DEBUG, "TLS: using phase1 config options");
eap_tls_params_from_conf1(params, config);
if (data->eap_type == EAP_TYPE_FAST)
params->flags |= TLS_CONN_EAP_FAST;
}
/*
* Use blob data, if available. Otherwise, leave reference to external
* file as-is.
*/
if (eap_tls_check_blob(sm, ¶ms->ca_cert, ¶ms->ca_cert_blob,
¶ms->ca_cert_blob_len) ||
eap_tls_check_blob(sm, ¶ms->client_cert,
¶ms->client_cert_blob,
¶ms->client_cert_blob_len) ||
eap_tls_check_blob(sm, ¶ms->private_key,
¶ms->private_key_blob,
¶ms->private_key_blob_len) ||
eap_tls_check_blob(sm, ¶ms->dh_file, ¶ms->dh_blob,
¶ms->dh_blob_len)) {
wpa_printf(MSG_INFO, "SSL: Failed to get configuration blobs");
return -1;
}
params->openssl_ciphers = config->openssl_ciphers;
sm->ext_cert_check = !!(params->flags & TLS_CONN_EXT_CERT_CHECK);
return 0;
}
static int eap_tls_init_connection(struct eap_sm *sm,
struct eap_ssl_data *data,
struct eap_peer_config *config,
struct tls_connection_params *params)
{
int res;
if (config->ocsp)
params->flags |= TLS_CONN_REQUEST_OCSP;
if (config->ocsp >= 2)
params->flags |= TLS_CONN_REQUIRE_OCSP;
if (config->ocsp == 3)
params->flags |= TLS_CONN_REQUIRE_OCSP_ALL;
data->conn = tls_connection_init(data->ssl_ctx);
if (data->conn == NULL) {
wpa_printf(MSG_INFO, "SSL: Failed to initialize new TLS "
"connection");
return -1;
}
res = tls_connection_set_params(data->ssl_ctx, data->conn, params);
if (res == TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN) {
/*
* At this point with the pkcs11 engine the PIN is wrong. We
* reset the PIN in the configuration to be sure to not use it
* again and the calling function must request a new one.
*/
wpa_printf(MSG_INFO,
"TLS: Bad PIN provided, requesting a new one");
os_free(config->pin);
config->pin = NULL;
eap_sm_request_pin(sm);
sm->ignore = TRUE;
} else if (res == TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED) {
wpa_printf(MSG_INFO, "TLS: Failed to initialize engine");
} else if (res == TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED) {
wpa_printf(MSG_INFO, "TLS: Failed to load private key");
sm->ignore = TRUE;
}
if (res) {
wpa_printf(MSG_INFO, "TLS: Failed to set TLS connection "
"parameters");
tls_connection_deinit(data->ssl_ctx, data->conn);
data->conn = NULL;
return -1;
}
return 0;
}
/**
* eap_peer_tls_ssl_init - Initialize shared TLS functionality
* @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
* @data: Data for TLS processing
* @config: Pointer to the network configuration
* @eap_type: EAP method used in Phase 1 (EAP_TYPE_TLS/PEAP/TTLS/FAST)
* Returns: 0 on success, -1 on failure
*
* This function is used to initialize shared TLS functionality for EAP-TLS,
* EAP-PEAP, EAP-TTLS, and EAP-FAST.
*/
int eap_peer_tls_ssl_init(struct eap_sm *sm, struct eap_ssl_data *data,
struct eap_peer_config *config, u8 eap_type)
{
struct tls_connection_params params;
if (config == NULL)
return -1;
data->eap = sm;
data->eap_type = eap_type;
data->phase2 = sm->init_phase2;
data->ssl_ctx = sm->init_phase2 && sm->ssl_ctx2 ? sm->ssl_ctx2 :
sm->ssl_ctx;
if (eap_tls_params_from_conf(sm, data, ¶ms, config, data->phase2) <
0)
return -1;
if (eap_tls_init_connection(sm, data, config, ¶ms) < 0)
return -1;
data->tls_out_limit = config->fragment_size;
if (data->phase2) {
/* Limit the fragment size in the inner TLS authentication
* since the outer authentication with EAP-PEAP does not yet
* support fragmentation */
if (data->tls_out_limit > 100)
data->tls_out_limit -= 100;
}
if (config->phase1 &&
os_strstr(config->phase1, "include_tls_length=1")) {
wpa_printf(MSG_DEBUG, "TLS: Include TLS Message Length in "
"unfragmented packets");
data->include_tls_length = 1;
}
return 0;
}
/**
* eap_peer_tls_ssl_deinit - Deinitialize shared TLS functionality
* @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
* @data: Data for TLS processing
*
* This function deinitializes shared TLS functionality that was initialized
* with eap_peer_tls_ssl_init().
*/
void eap_peer_tls_ssl_deinit(struct eap_sm *sm, struct eap_ssl_data *data)
{
tls_connection_deinit(data->ssl_ctx, data->conn);
eap_peer_tls_reset_input(data);
eap_peer_tls_reset_output(data);
}
/**
* eap_peer_tls_derive_key - Derive a key based on TLS session data
* @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
* @data: Data for TLS processing
* @label: Label string for deriving the keys, e.g., "client EAP encryption"
* @len: Length of the key material to generate (usually 64 for MSK)
* Returns: Pointer to allocated key on success or %NULL on failure
*
* This function uses TLS-PRF to generate pseudo-random data based on the TLS
* session data (client/server random and master key). Each key type may use a
* different label to bind the key usage into the generated material.
*
* The caller is responsible for freeing the returned buffer.
*/
u8 * eap_peer_tls_derive_key(struct eap_sm *sm, struct eap_ssl_data *data,
const char *label, size_t len)
{
u8 *out;
out = os_malloc(len);
if (out == NULL)
return NULL;
if (tls_connection_export_key(data->ssl_ctx, data->conn, label, out,
len)) {
os_free(out);
return NULL;
}
return out;
}
/**
* eap_peer_tls_derive_session_id - Derive a Session-Id based on TLS data
* @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
* @data: Data for TLS processing
* @eap_type: EAP method used in Phase 1 (EAP_TYPE_TLS/PEAP/TTLS/FAST)
* @len: Pointer to length of the session ID generated
* Returns: Pointer to allocated Session-Id on success or %NULL on failure
*
* This function derive the Session-Id based on the TLS session data
* (client/server random and method type).
*
* The caller is responsible for freeing the returned buffer.
*/
u8 * eap_peer_tls_derive_session_id(struct eap_sm *sm,
struct eap_ssl_data *data, u8 eap_type,
size_t *len)
{
struct tls_random keys;
u8 *out;
if (eap_type == EAP_TYPE_TLS && data->tls_v13) {
*len = 64;
return eap_peer_tls_derive_key(sm, data,
"EXPORTER_EAP_TLS_Session-Id",
64);
}
if (tls_connection_get_random(sm->ssl_ctx, data->conn, &keys) ||
keys.client_random == NULL || keys.server_random == NULL)
return NULL;
*len = 1 + keys.client_random_len + keys.server_random_len;
out = os_malloc(*len);
if (out == NULL)
return NULL;
/* Session-Id = EAP type || client.random || server.random */
out[0] = eap_type;
os_memcpy(out + 1, keys.client_random, keys.client_random_len);
os_memcpy(out + 1 + keys.client_random_len, keys.server_random,
keys.server_random_len);
return out;
}
/**
* eap_peer_tls_reassemble_fragment - Reassemble a received fragment
* @data: Data for TLS processing
* @in_data: Next incoming TLS segment
* Returns: 0 on success, 1 if more data is needed for the full message, or
* -1 on error
*/
static int eap_peer_tls_reassemble_fragment(struct eap_ssl_data *data,
const struct wpabuf *in_data)
{
size_t tls_in_len, in_len;
tls_in_len = data->tls_in ? wpabuf_len(data->tls_in) : 0;
in_len = in_data ? wpabuf_len(in_data) : 0;
if (tls_in_len + in_len == 0) {
/* No message data received?! */
wpa_printf(MSG_WARNING, "SSL: Invalid reassembly state: "
"tls_in_left=%lu tls_in_len=%lu in_len=%lu",
(unsigned long) data->tls_in_left,
(unsigned long) tls_in_len,
(unsigned long) in_len);
eap_peer_tls_reset_input(data);
return -1;
}
if (tls_in_len + in_len > 65536) {
/*
* Limit length to avoid rogue servers from causing large
* memory allocations.
*/
wpa_printf(MSG_INFO, "SSL: Too long TLS fragment (size over "
"64 kB)");
eap_peer_tls_reset_input(data);
return -1;
}
if (in_len > data->tls_in_left) {
/* Sender is doing something odd - reject message */
wpa_printf(MSG_INFO, "SSL: more data than TLS message length "
"indicated");
eap_peer_tls_reset_input(data);
return -1;
}
if (wpabuf_resize(&data->tls_in, in_len) < 0) {
wpa_printf(MSG_INFO, "SSL: Could not allocate memory for TLS "
"data");
eap_peer_tls_reset_input(data);
return -1;
}
if (in_data)
wpabuf_put_buf(data->tls_in, in_data);
data->tls_in_left -= in_len;
if (data->tls_in_left > 0) {
wpa_printf(MSG_DEBUG, "SSL: Need %lu bytes more input "
"data", (unsigned long) data->tls_in_left);
return 1;
}
return 0;
}
/**
* eap_peer_tls_data_reassemble - Reassemble TLS data
* @data: Data for TLS processing
* @in_data: Next incoming TLS segment
* @need_more_input: Variable for returning whether more input data is needed
* to reassemble this TLS packet
* Returns: Pointer to output data, %NULL on error or when more data is needed
* for the full message (in which case, *need_more_input is also set to 1).
*
* This function reassembles TLS fragments. Caller must not free the returned
* data buffer since an internal pointer to it is maintained.
*/
static const struct wpabuf * eap_peer_tls_data_reassemble(
struct eap_ssl_data *data, const struct wpabuf *in_data,
int *need_more_input)
{
*need_more_input = 0;
if (data->tls_in_left > wpabuf_len(in_data) || data->tls_in) {
/* Message has fragments */
int res = eap_peer_tls_reassemble_fragment(data, in_data);
if (res) {
if (res == 1)
*need_more_input = 1;
return NULL;
}
/* Message is now fully reassembled. */
} else {
/* No fragments in this message, so just make a copy of it. */
data->tls_in_left = 0;
data->tls_in = wpabuf_dup(in_data);
if (data->tls_in == NULL)
return NULL;
}
return data->tls_in;
}
/**
* eap_tls_process_input - Process incoming TLS message
* @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
* @data: Data for TLS processing
* @in_data: Message received from the server
* @out_data: Buffer for returning a pointer to application data (if available)
* Returns: 0 on success, 1 if more input data is needed, 2 if application data
* is available, -1 on failure
*/
static int eap_tls_process_input(struct eap_sm *sm, struct eap_ssl_data *data,
const struct wpabuf *in_data,
struct wpabuf **out_data)
{
const struct wpabuf *msg;
int need_more_input;
struct wpabuf *appl_data;
msg = eap_peer_tls_data_reassemble(data, in_data, &need_more_input);
if (msg == NULL)
return need_more_input ? 1 : -1;
/* Full TLS message reassembled - continue handshake processing */
if (data->tls_out) {
/* This should not happen.. */
wpa_printf(MSG_INFO, "SSL: eap_tls_process_input - pending "
"tls_out data even though tls_out_len = 0");
wpabuf_free(data->tls_out);
WPA_ASSERT(data->tls_out == NULL);
}
appl_data = NULL;
data->tls_out = tls_connection_handshake(data->ssl_ctx, data->conn,
msg, &appl_data);
eap_peer_tls_reset_input(data);
if (appl_data &&
tls_connection_established(data->ssl_ctx, data->conn) &&
!tls_connection_get_failed(data->ssl_ctx, data->conn)) {
wpa_hexdump_buf_key(MSG_MSGDUMP, "SSL: Application data",
appl_data);
*out_data = appl_data;
return 2;
}
wpabuf_free(appl_data);
return 0;
}
/**
* eap_tls_process_output - Process outgoing TLS message
* @data: Data for TLS processing
* @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
* @peap_version: Version number for EAP-PEAP/TTLS
* @id: EAP identifier for the response
* @ret: Return value to use on success
* @out_data: Buffer for returning the allocated output buffer
* Returns: ret (0 or 1) on success, -1 on failure
*/
static int eap_tls_process_output(struct eap_ssl_data *data, EapType eap_type,
int peap_version, u8 id, int ret,
struct wpabuf **out_data)
{
size_t len;
u8 *flags;
int more_fragments, length_included;
if (data->tls_out == NULL)
return -1;
len = wpabuf_len(data->tls_out) - data->tls_out_pos;
wpa_printf(MSG_DEBUG, "SSL: %lu bytes left to be sent out (of total "
"%lu bytes)",
(unsigned long) len,
(unsigned long) wpabuf_len(data->tls_out));
/*
* Limit outgoing message to the configured maximum size. Fragment
* message if needed.
*/
if (len > data->tls_out_limit) {
more_fragments = 1;
len = data->tls_out_limit;
wpa_printf(MSG_DEBUG, "SSL: sending %lu bytes, more fragments "
"will follow", (unsigned long) len);
} else
more_fragments = 0;
length_included = data->tls_out_pos == 0 &&
(wpabuf_len(data->tls_out) > data->tls_out_limit ||
data->include_tls_length);
if (!length_included &&
eap_type == EAP_TYPE_PEAP && peap_version == 0 &&
!tls_connection_established(data->eap->ssl_ctx, data->conn)) {
/*
* Windows Server 2008 NPS really wants to have the TLS Message
* length included in phase 0 even for unfragmented frames or
* it will get very confused with Compound MAC calculation and
* Outer TLVs.
*/
length_included = 1;
}
*out_data = eap_tls_msg_alloc(eap_type, 1 + length_included * 4 + len,
EAP_CODE_RESPONSE, id);
if (*out_data == NULL)
return -1;
flags = wpabuf_put(*out_data, 1);
*flags = peap_version;
if (more_fragments)
*flags |= EAP_TLS_FLAGS_MORE_FRAGMENTS;
if (length_included) {
*flags |= EAP_TLS_FLAGS_LENGTH_INCLUDED;
wpabuf_put_be32(*out_data, wpabuf_len(data->tls_out));
}
wpabuf_put_data(*out_data,
wpabuf_head_u8(data->tls_out) + data->tls_out_pos,
len);
data->tls_out_pos += len;
if (!more_fragments)
eap_peer_tls_reset_output(data);
return ret;
}
/**
* eap_peer_tls_process_helper - Process TLS handshake message
* @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
* @data: Data for TLS processing
* @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
* @peap_version: Version number for EAP-PEAP/TTLS
* @id: EAP identifier for the response
* @in_data: Message received from the server
* @out_data: Buffer for returning a pointer to the response message
* Returns: 0 on success, 1 if more input data is needed, 2 if application data
* is available, or -1 on failure
*
* This function can be used to process TLS handshake messages. It reassembles
* the received fragments and uses a TLS library to process the messages. The
* response data from the TLS library is fragmented to suitable output messages
* that the caller can send out.
*
* out_data is used to return the response message if the return value of this
* function is 0, 2, or -1. In case of failure, the message is likely a TLS
* alarm message. The caller is responsible for freeing the allocated buffer if
* *out_data is not %NULL.
*
* This function is called for each received TLS message during the TLS
* handshake after eap_peer_tls_process_init() call and possible processing of
* TLS Flags field. Once the handshake has been completed, i.e., when
* tls_connection_established() returns 1, EAP method specific decrypting of
* the tunneled data is used.
*/
int eap_peer_tls_process_helper(struct eap_sm *sm, struct eap_ssl_data *data,
EapType eap_type, int peap_version,
u8 id, const struct wpabuf *in_data,
struct wpabuf **out_data)
{
int ret = 0;
*out_data = NULL;
if (data->tls_out && wpabuf_len(data->tls_out) > 0 &&
wpabuf_len(in_data) > 0) {
wpa_printf(MSG_DEBUG, "SSL: Received non-ACK when output "
"fragments are waiting to be sent out");
return -1;
}
if (data->tls_out == NULL || wpabuf_len(data->tls_out) == 0) {
/*
* No more data to send out - expect to receive more data from
* the AS.
*/
int res = eap_tls_process_input(sm, data, in_data, out_data);
char buf[20];
if (res) {
/*
* Input processing failed (res = -1) or more data is
* needed (res = 1).
*/
return res;
}
/*
* The incoming message has been reassembled and processed. The
* response was allocated into data->tls_out buffer.
*/
if (tls_get_version(data->ssl_ctx, data->conn,
buf, sizeof(buf)) == 0) {
wpa_printf(MSG_DEBUG, "SSL: Using TLS version %s", buf);
data->tls_v13 = os_strcmp(buf, "TLSv1.3") == 0;
}
}
if (data->tls_out == NULL) {
/*
* No outgoing fragments remaining from the previous message
* and no new message generated. This indicates an error in TLS
* processing.
*/
eap_peer_tls_reset_output(data);
return -1;
}
if (tls_connection_get_failed(data->ssl_ctx, data->conn)) {
/* TLS processing has failed - return error */
wpa_printf(MSG_DEBUG, "SSL: Failed - tls_out available to "
"report error (len=%u)",
(unsigned int) wpabuf_len(data->tls_out));
ret = -1;
/* TODO: clean pin if engine used? */
if (wpabuf_len(data->tls_out) == 0) {
wpabuf_free(data->tls_out);
data->tls_out = NULL;
return -1;
}
}
if (wpabuf_len(data->tls_out) == 0) {
/*
* TLS negotiation should now be complete since all other cases
* needing more data should have been caught above based on
* the TLS Message Length field.
*/
wpa_printf(MSG_DEBUG, "SSL: No data to be sent out");
wpabuf_free(data->tls_out);
data->tls_out = NULL;
return 1;
}
/* Send the pending message (in fragments, if needed). */
return eap_tls_process_output(data, eap_type, peap_version, id, ret,
out_data);
}
/**
* eap_peer_tls_build_ack - Build a TLS ACK frame
* @id: EAP identifier for the response
* @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
* @peap_version: Version number for EAP-PEAP/TTLS
* Returns: Pointer to the allocated ACK frame or %NULL on failure
*/
struct wpabuf * eap_peer_tls_build_ack(u8 id, EapType eap_type,
int peap_version)
{
struct wpabuf *resp;
resp = eap_tls_msg_alloc(eap_type, 1, EAP_CODE_RESPONSE, id);
if (resp == NULL)
return NULL;
wpa_printf(MSG_DEBUG, "SSL: Building ACK (type=%d id=%d ver=%d)",
(int) eap_type, id, peap_version);
wpabuf_put_u8(resp, peap_version); /* Flags */
return resp;
}
/**
* eap_peer_tls_reauth_init - Re-initialize shared TLS for session resumption
* @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
* @data: Data for TLS processing
* Returns: 0 on success, -1 on failure
*/
int eap_peer_tls_reauth_init(struct eap_sm *sm, struct eap_ssl_data *data)
{
eap_peer_tls_reset_input(data);
eap_peer_tls_reset_output(data);
return tls_connection_shutdown(data->ssl_ctx, data->conn);
}
/**
* eap_peer_tls_status - Get TLS status
* @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
* @data: Data for TLS processing
* @buf: Buffer for status information
* @buflen: Maximum buffer length
* @verbose: Whether to include verbose status information
* Returns: Number of bytes written to buf.
*/
int eap_peer_tls_status(struct eap_sm *sm, struct eap_ssl_data *data,
char *buf, size_t buflen, int verbose)
{
char version[20], name[128];
int len = 0, ret;
if (tls_get_version(data->ssl_ctx, data->conn, version,
sizeof(version)) < 0)
version[0] = '\0';
if (tls_get_cipher(data->ssl_ctx, data->conn, name, sizeof(name)) < 0)
name[0] = '\0';
ret = os_snprintf(buf + len, buflen - len,
"eap_tls_version=%s\n"
"EAP TLS cipher=%s\n"
"tls_session_reused=%d\n",
version, name,
tls_connection_resumed(data->ssl_ctx, data->conn));
if (os_snprintf_error(buflen - len, ret))
return len;
len += ret;
return len;
}
/**
* eap_peer_tls_process_init - Initial validation/processing of EAP requests
* @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
* @data: Data for TLS processing
* @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
* @ret: Return values from EAP request validation and processing
* @reqData: EAP request to be processed (eapReqData)
* @len: Buffer for returning length of the remaining payload
* @flags: Buffer for returning TLS flags
* Returns: Pointer to payload after TLS flags and length or %NULL on failure
*
* This function validates the EAP header and processes the optional TLS
* Message Length field. If this is the first fragment of a TLS message, the
* TLS reassembly code is initialized to receive the indicated number of bytes.
*
* EAP-TLS, EAP-PEAP, EAP-TTLS, and EAP-FAST methods are expected to use this
* function as the first step in processing received messages. They will need
* to process the flags (apart from Message Length Included) that are returned
* through the flags pointer and the message payload that will be returned (and
* the length is returned through the len pointer). Return values (ret) are set
* for continuation of EAP method processing. The caller is responsible for
* setting these to indicate completion (either success or failure) based on
* the authentication result.
*/
const u8 * eap_peer_tls_process_init(struct eap_sm *sm,
struct eap_ssl_data *data,
EapType eap_type,
struct eap_method_ret *ret,
const struct wpabuf *reqData,
size_t *len, u8 *flags)
{
const u8 *pos;
size_t left;
unsigned int tls_msg_len;
if (tls_get_errors(data->ssl_ctx)) {
wpa_printf(MSG_INFO, "SSL: TLS errors detected");
ret->ignore = TRUE;
return NULL;
}
if (eap_type == EAP_UNAUTH_TLS_TYPE)
pos = eap_hdr_validate(EAP_VENDOR_UNAUTH_TLS,
EAP_VENDOR_TYPE_UNAUTH_TLS, reqData,
&left);
else if (eap_type == EAP_WFA_UNAUTH_TLS_TYPE)
pos = eap_hdr_validate(EAP_VENDOR_WFA_NEW,
EAP_VENDOR_WFA_UNAUTH_TLS, reqData,
&left);
else
pos = eap_hdr_validate(EAP_VENDOR_IETF, eap_type, reqData,
&left);
if (pos == NULL) {
ret->ignore = TRUE;
return NULL;
}
if (left == 0) {
wpa_printf(MSG_DEBUG, "SSL: Invalid TLS message: no Flags "
"octet included");
if (!sm->workaround) {
ret->ignore = TRUE;
return NULL;
}
wpa_printf(MSG_DEBUG, "SSL: Workaround - assume no Flags "
"indicates ACK frame");
*flags = 0;
} else {
*flags = *pos++;
left--;
}
wpa_printf(MSG_DEBUG, "SSL: Received packet(len=%lu) - "
"Flags 0x%02x", (unsigned long) wpabuf_len(reqData),
*flags);
if (*flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) {
if (left < 4) {
wpa_printf(MSG_INFO, "SSL: Short frame with TLS "
"length");
ret->ignore = TRUE;
return NULL;
}
tls_msg_len = WPA_GET_BE32(pos);
wpa_printf(MSG_DEBUG, "SSL: TLS Message Length: %d",
tls_msg_len);
if (data->tls_in_left == 0) {
data->tls_in_total = tls_msg_len;
data->tls_in_left = tls_msg_len;
wpabuf_free(data->tls_in);
data->tls_in = NULL;
}
pos += 4;
left -= 4;
if (left > tls_msg_len) {
wpa_printf(MSG_INFO, "SSL: TLS Message Length (%d "
"bytes) smaller than this fragment (%d "
"bytes)", (int) tls_msg_len, (int) left);
ret->ignore = TRUE;
return NULL;
}
}
ret->ignore = FALSE;
ret->methodState = METHOD_MAY_CONT;
ret->decision = DECISION_FAIL;
ret->allowNotifications = TRUE;
*len = left;
return pos;
}
/**
* eap_peer_tls_reset_input - Reset input buffers
* @data: Data for TLS processing
*
* This function frees any allocated memory for input buffers and resets input
* state.
*/
void eap_peer_tls_reset_input(struct eap_ssl_data *data)
{
data->tls_in_left = data->tls_in_total = 0;
wpabuf_free(data->tls_in);
data->tls_in = NULL;
}
/**
* eap_peer_tls_reset_output - Reset output buffers
* @data: Data for TLS processing
*
* This function frees any allocated memory for output buffers and resets
* output state.
*/
void eap_peer_tls_reset_output(struct eap_ssl_data *data)
{
data->tls_out_pos = 0;
wpabuf_free(data->tls_out);
data->tls_out = NULL;
}
/**
* eap_peer_tls_decrypt - Decrypt received phase 2 TLS message
* @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
* @data: Data for TLS processing
* @in_data: Message received from the server
* @in_decrypted: Buffer for returning a pointer to the decrypted message
* Returns: 0 on success, 1 if more input data is needed, or -1 on failure
*/
int eap_peer_tls_decrypt(struct eap_sm *sm, struct eap_ssl_data *data,
const struct wpabuf *in_data,
struct wpabuf **in_decrypted)
{
const struct wpabuf *msg;
int need_more_input;
msg = eap_peer_tls_data_reassemble(data, in_data, &need_more_input);
if (msg == NULL)
return need_more_input ? 1 : -1;
*in_decrypted = tls_connection_decrypt(data->ssl_ctx, data->conn, msg);
eap_peer_tls_reset_input(data);
if (*in_decrypted == NULL) {
wpa_printf(MSG_INFO, "SSL: Failed to decrypt Phase 2 data");
return -1;
}
return 0;
}
/**
* eap_peer_tls_encrypt - Encrypt phase 2 TLS message
* @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
* @data: Data for TLS processing
* @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
* @peap_version: Version number for EAP-PEAP/TTLS
* @id: EAP identifier for the response
* @in_data: Plaintext phase 2 data to encrypt or %NULL to continue fragments
* @out_data: Buffer for returning a pointer to the encrypted response message
* Returns: 0 on success, -1 on failure
*/
int eap_peer_tls_encrypt(struct eap_sm *sm, struct eap_ssl_data *data,
EapType eap_type, int peap_version, u8 id,
const struct wpabuf *in_data,
struct wpabuf **out_data)
{
if (in_data) {
eap_peer_tls_reset_output(data);
data->tls_out = tls_connection_encrypt(data->ssl_ctx,
data->conn, in_data);
if (data->tls_out == NULL) {
wpa_printf(MSG_INFO, "SSL: Failed to encrypt Phase 2 "
"data (in_len=%lu)",
(unsigned long) wpabuf_len(in_data));
eap_peer_tls_reset_output(data);
return -1;
}
}
return eap_tls_process_output(data, eap_type, peap_version, id, 0,
out_data);
}
/**
* eap_peer_select_phase2_methods - Select phase 2 EAP method
* @config: Pointer to the network configuration
* @prefix: 'phase2' configuration prefix, e.g., "auth="
* @types: Buffer for returning allocated list of allowed EAP methods
* @num_types: Buffer for returning number of allocated EAP methods
* Returns: 0 on success, -1 on failure
*
* This function is used to parse EAP method list and select allowed methods
* for Phase2 authentication.
*/
int eap_peer_select_phase2_methods(struct eap_peer_config *config,
const char *prefix,
struct eap_method_type **types,
size_t *num_types)
{
char *start, *pos, *buf;
struct eap_method_type *methods = NULL, *_methods;
u32 method;
size_t num_methods = 0, prefix_len;
if (config == NULL || config->phase2 == NULL)
goto get_defaults;
start = buf = os_strdup(config->phase2);
if (buf == NULL)
return -1;
prefix_len = os_strlen(prefix);
while (start && *start != '\0') {
int vendor;
pos = os_strstr(start, prefix);
if (pos == NULL)
break;
if (start != pos && *(pos - 1) != ' ') {
start = pos + prefix_len;
continue;
}
start = pos + prefix_len;
pos = os_strchr(start, ' ');
if (pos)
*pos++ = '\0';
method = eap_get_phase2_type(start, &vendor);
if (vendor == EAP_VENDOR_IETF && method == EAP_TYPE_NONE) {
wpa_printf(MSG_ERROR, "TLS: Unsupported Phase2 EAP "
"method '%s'", start);
os_free(methods);
os_free(buf);
return -1;
} else {
num_methods++;
_methods = os_realloc_array(methods, num_methods,
sizeof(*methods));
if (_methods == NULL) {
os_free(methods);
os_free(buf);
return -1;
}
methods = _methods;
methods[num_methods - 1].vendor = vendor;
methods[num_methods - 1].method = method;
}
start = pos;
}
os_free(buf);
get_defaults:
if (methods == NULL)
methods = eap_get_phase2_types(config, &num_methods);
if (methods == NULL) {
wpa_printf(MSG_ERROR, "TLS: No Phase2 EAP methods available");
return -1;
}
wpa_hexdump(MSG_DEBUG, "TLS: Phase2 EAP types",
(u8 *) methods,
num_methods * sizeof(struct eap_method_type));
*types = methods;
*num_types = num_methods;
return 0;
}
/**
* eap_peer_tls_phase2_nak - Generate EAP-Nak for Phase 2
* @types: Buffer for returning allocated list of allowed EAP methods
* @num_types: Buffer for returning number of allocated EAP methods
* @hdr: EAP-Request header (and the following EAP type octet)
* @resp: Buffer for returning the EAP-Nak message
* Returns: 0 on success, -1 on failure
*/
int eap_peer_tls_phase2_nak(struct eap_method_type *types, size_t num_types,
struct eap_hdr *hdr, struct wpabuf **resp)
{
u8 *pos = (u8 *) (hdr + 1);
size_t i;
/* TODO: add support for expanded Nak */
wpa_printf(MSG_DEBUG, "TLS: Phase 2 Request: Nak type=%d", *pos);
wpa_hexdump(MSG_DEBUG, "TLS: Allowed Phase2 EAP types",
(u8 *) types, num_types * sizeof(struct eap_method_type));
*resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_NAK, num_types,
EAP_CODE_RESPONSE, hdr->identifier);
if (*resp == NULL)
return -1;
for (i = 0; i < num_types; i++) {
if (types[i].vendor == EAP_VENDOR_IETF &&
types[i].method < 256)
wpabuf_put_u8(*resp, types[i].method);
}
eap_update_len(*resp);
return 0;
}