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EXT PW: Add support for password parameter from external storage

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This allows the password parameter for EAP methods to be fetched
from an external storage.

Following example can be used for developer testing:

ext_password_backend=test:pw1=password|pw2=testing

network={
    key_mgmt=WPA-EAP
    eap=TTLS
    identity="user"
    password=ext:pw1
    ca_cert="ca.pem"
    phase2="auth=PAP"
}

Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2012-08-03 21:47:31 +03:00
parent 9173b16fd1
commit 0ebb23e340
9 changed files with 107 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
src/eap_peer/eap.c
View File

@ -20,6 +20,7 @@
#include "common.h"
#include "pcsc_funcs.h"
#include "state_machine.h"
#include "ext_password.h"
#include "crypto/crypto.h"
#include "crypto/tls.h"
#include "common/wpa_ctrl.h"
@ -93,6 +94,9 @@ static void eap_notify_status(struct eap_sm *sm, const char *status,
static void eap_deinit_prev_method(struct eap_sm *sm, const char *txt)
{
ext_password_free(sm->ext_pw_buf);
sm->ext_pw_buf = NULL;
if (sm->m == NULL || sm->eap_method_priv == NULL)
return;
@ -1915,6 +1919,27 @@ const u8 * eap_get_config_identity(struct eap_sm *sm, size_t *len)
}
static int eap_get_ext_password(struct eap_sm *sm,
struct eap_peer_config *config)
{
char *name;
if (config->password == NULL)
return -1;
name = os_zalloc(config->password_len + 1);
if (name == NULL)
return -1;
os_memcpy(name, config->password, config->password_len);
ext_password_free(sm->ext_pw_buf);
sm->ext_pw_buf = ext_password_get(sm->ext_pw, name);
os_free(name);
return sm->ext_pw_buf == NULL ? -1 : 0;
}
/**
* eap_get_config_password - Get password from the network configuration
* @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
@ -1926,6 +1951,14 @@ const u8 * eap_get_config_password(struct eap_sm *sm, size_t *len)
struct eap_peer_config *config = eap_get_config(sm);
if (config == NULL)
return NULL;
if (config->flags & EAP_CONFIG_FLAGS_EXT_PASSWORD) {
if (eap_get_ext_password(sm, config) < 0)
return NULL;
*len = wpabuf_len(sm->ext_pw_buf);
return wpabuf_head(sm->ext_pw_buf);
}
*len = config->password_len;
return config->password;
}
@ -1945,6 +1978,14 @@ const u8 * eap_get_config_password2(struct eap_sm *sm, size_t *len, int *hash)
struct eap_peer_config *config = eap_get_config(sm);
if (config == NULL)
return NULL;
if (config->flags & EAP_CONFIG_FLAGS_EXT_PASSWORD) {
if (eap_get_ext_password(sm, config) < 0)
return NULL;
*len = wpabuf_len(sm->ext_pw_buf);
return wpabuf_head(sm->ext_pw_buf);
}
*len = config->password_len;
if (hash)
*hash = !!(config->flags & EAP_CONFIG_FLAGS_PASSWORD_NTHASH);
@ -2256,3 +2297,11 @@ int eap_is_wps_pin_enrollee(struct eap_peer_config *conf)
return 1;
}
void eap_sm_set_ext_pw_ctx(struct eap_sm *sm, struct ext_password_data *ext)
{
ext_password_free(sm->ext_pw_buf);
sm->ext_pw_buf = NULL;
sm->ext_pw = ext;
}

3
src/eap_peer/eap.h
View File

@ -306,6 +306,9 @@ void eap_invalidate_cached_session(struct eap_sm *sm);
int eap_is_wps_pbc_enrollee(struct eap_peer_config *conf);
int eap_is_wps_pin_enrollee(struct eap_peer_config *conf);
struct ext_password_data;
void eap_sm_set_ext_pw_ctx(struct eap_sm *sm, struct ext_password_data *ext);
#endif /* IEEE8021X_EAPOL */
#endif /* EAP_H */

3
src/eap_peer/eap_config.h
View File

@ -619,6 +619,7 @@ struct eap_peer_config {
int fragment_size;
#define EAP_CONFIG_FLAGS_PASSWORD_NTHASH BIT(0)
#define EAP_CONFIG_FLAGS_EXT_PASSWORD BIT(1)
/**
* flags - Network configuration flags (bitfield)
*
@ -626,6 +627,8 @@ struct eap_peer_config {
* for the network parameters.
* bit 0 = password is represented as a 16-byte NtPasswordHash value
* instead of plaintext password
* bit 1 = password is stored in external storage; the value in the
* password field is the name of that external entry
*/
u32 flags;
};

3
src/eap_peer/eap_i.h
View File

@ -330,6 +330,9 @@ struct eap_sm {
struct wps_context *wps;
int prev_failure;
struct ext_password_data *ext_pw;
struct wpabuf *ext_pw_buf;
};
const u8 * eap_get_config_identity(struct eap_sm *sm, size_t *len);

4
src/eap_peer/eap_mschapv2.c
View File

@ -304,7 +304,9 @@ static void eap_mschapv2_password_changed(struct eap_sm *sm,
"EAP-MSCHAPV2: Password changed successfully");
data->prev_error = 0;
os_free(config->password);
if (config->flags & EAP_CONFIG_FLAGS_PASSWORD_NTHASH) {
if (config->flags & EAP_CONFIG_FLAGS_EXT_PASSWORD) {
/* TODO: update external storage */
} else if (config->flags & EAP_CONFIG_FLAGS_PASSWORD_NTHASH) {
config->password = os_malloc(16);
config->password_len = 16;
if (config->password) {

10
src/eapol_supp/eapol_supp_sm.c
View File

@ -1,6 +1,6 @@
/*
* EAPOL supplicant state machines
* Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
* Copyright (c) 2004-2012, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
@ -1946,3 +1946,11 @@ void eapol_sm_deinit(struct eapol_sm *sm)
os_free(sm->ctx);
os_free(sm);
}
void eapol_sm_set_ext_pw_ctx(struct eapol_sm *sm,
struct ext_password_data *ext)
{
if (sm && sm->eap)
eap_sm_set_ext_pw_ctx(sm->eap, ext);
}

9
src/eapol_supp/eapol_supp_sm.h
View File

@ -1,6 +1,6 @@
/*
* EAPOL supplicant state machines
* Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
* Copyright (c) 2004-2012, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
@ -243,6 +243,7 @@ struct eapol_ctx {
struct eap_peer_config;
struct ext_password_data;
#ifdef IEEE8021X_EAPOL
struct eapol_sm *eapol_sm_init(struct eapol_ctx *ctx);
@ -275,6 +276,8 @@ void eapol_sm_request_reauth(struct eapol_sm *sm);
void eapol_sm_notify_lower_layer_success(struct eapol_sm *sm, int in_eapol_sm);
void eapol_sm_invalidate_cached_session(struct eapol_sm *sm);
const char * eapol_sm_get_method_name(struct eapol_sm *sm);
void eapol_sm_set_ext_pw_ctx(struct eapol_sm *sm,
struct ext_password_data *ext);
#else /* IEEE8021X_EAPOL */
static inline struct eapol_sm *eapol_sm_init(struct eapol_ctx *ctx)
{
@ -366,6 +369,10 @@ static inline const char * eapol_sm_get_method_name(struct eapol_sm *sm)
{
return NULL;
}
static inline void eapol_sm_set_ext_pw_ctx(struct eapol_sm *sm,
struct ext_password_data *ext)
{
}
#endif /* IEEE8021X_EAPOL */
#endif /* EAPOL_SUPP_SM_H */

27
wpa_supplicant/config.c
View File

@ -1192,6 +1192,20 @@ static int wpa_config_parse_password(const struct parse_data *data,
return 0;
}
#ifdef CONFIG_EXT_PASSWORD
if (os_strncmp(value, "ext:", 4) == 0) {
char *name = os_strdup(value + 4);
if (name == NULL)
return -1;
os_free(ssid->eap.password);
ssid->eap.password = (u8 *) name;
ssid->eap.password_len = os_strlen(name);
ssid->eap.flags &= ~EAP_CONFIG_FLAGS_PASSWORD_NTHASH;
ssid->eap.flags |= EAP_CONFIG_FLAGS_EXT_PASSWORD;
return 0;
}
#endif /* CONFIG_EXT_PASSWORD */
if (os_strncmp(value, "hash:", 5) != 0) {
char *tmp;
size_t res_len;
@ -1209,6 +1223,7 @@ static int wpa_config_parse_password(const struct parse_data *data,
ssid->eap.password = (u8 *) tmp;
ssid->eap.password_len = res_len;
ssid->eap.flags &= ~EAP_CONFIG_FLAGS_PASSWORD_NTHASH;
ssid->eap.flags &= ~EAP_CONFIG_FLAGS_EXT_PASSWORD;
return 0;
}
@ -1237,6 +1252,7 @@ static int wpa_config_parse_password(const struct parse_data *data,
ssid->eap.password = hash;
ssid->eap.password_len = 16;
ssid->eap.flags |= EAP_CONFIG_FLAGS_PASSWORD_NTHASH;
ssid->eap.flags &= ~EAP_CONFIG_FLAGS_EXT_PASSWORD;
return 0;
}
@ -1250,6 +1266,17 @@ static char * wpa_config_write_password(const struct parse_data *data,
if (ssid->eap.password == NULL)
return NULL;
#ifdef CONFIG_EXT_PASSWORD
if (ssid->eap.flags & EAP_CONFIG_FLAGS_EXT_PASSWORD) {
buf = os_zalloc(4 + ssid->eap.password_len + 1);
if (buf == NULL)
return NULL;
os_memcpy(buf, "ext:", 4);
os_memcpy(buf + 4, ssid->eap.password, ssid->eap.password_len);
return buf;
}
#endif /* CONFIG_EXT_PASSWORD */
if (!(ssid->eap.flags & EAP_CONFIG_FLAGS_PASSWORD_NTHASH)) {
return wpa_config_write_string(
ssid->eap.password, ssid->eap.password_len);

3
wpa_supplicant/wpa_supplicant.conf
View File

@ -578,7 +578,8 @@ fast_reauth=1
# MSCHAP (EAP-MSCHAPv2, EAP-TTLS/MSCHAPv2, EAP-TTLS/MSCHAP, LEAP).
# EAP-PSK (128-bit PSK), EAP-PAX (128-bit PSK), and EAP-SAKE (256-bit
# PSK) is also configured using this field. For EAP-GPSK, this is a
# variable length PSK.
# variable length PSK. ext:<name of external password field> format can
# be used to indicate that the password is stored in external storage.
# ca_cert: File path to CA certificate file (PEM/DER). This file can have one
# or more trusted CA certificates. If ca_cert and ca_path are not
# included, server certificate will not be verified. This is insecure and