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-rw-r--r--src/charon/Makefile.am7
-rw-r--r--src/charon/sa/authenticators/eap/eap_sim.c482
-rw-r--r--src/charon/sa/authenticators/eap/eap_sim.h89
-rw-r--r--src/charon/sa/authenticators/eap/sim/eap_sim_file.c288
-rw-r--r--testing/tests/ikev2/rw-eap-sim-rsa/description.txt7
-rw-r--r--testing/tests/ikev2/rw-eap-sim-rsa/evaltest.dat10
-rwxr-xr-xtesting/tests/ikev2/rw-eap-sim-rsa/hosts/carol/etc/ipsec.conf23
-rw-r--r--testing/tests/ikev2/rw-eap-sim-rsa/hosts/carol/etc/ipsec.d/triplets.dat3
-rwxr-xr-xtesting/tests/ikev2/rw-eap-sim-rsa/hosts/moon/etc/ipsec.conf24
-rw-r--r--testing/tests/ikev2/rw-eap-sim-rsa/hosts/moon/etc/ipsec.d/triplets.dat3
-rw-r--r--testing/tests/ikev2/rw-eap-sim-rsa/posttest.dat4
-rw-r--r--testing/tests/ikev2/rw-eap-sim-rsa/pretest.dat9
-rw-r--r--testing/tests/ikev2/rw-eap-sim-rsa/test.conf21
13 files changed, 829 insertions, 141 deletions
diff --git a/src/charon/Makefile.am b/src/charon/Makefile.am
index 9111191b6..1d7022336 100644
--- a/src/charon/Makefile.am
+++ b/src/charon/Makefile.am
@@ -104,7 +104,8 @@ endif
INCLUDES = -I${linuxdir} -I$(top_srcdir)/src/libstrongswan -I$(top_srcdir)/src/charon -I$(top_srcdir)/src/stroke
AM_CFLAGS = -rdynamic -DIPSEC_CONFDIR=\"${confdir}\" -DIPSEC_DIR=\"${ipsecdir}\" -DIPSEC_PIDDIR=\"${piddir}\" \
- -DIPSEC_EAPDIR=\"${eapdir}\" -DIPSEC_BACKENDDIR=\"${backenddir}\" -DIPSEC_INTERFACEDIR=\"${interfacedir}\"
+ -DIPSEC_EAPDIR=\"${eapdir}\" -DIPSEC_BACKENDDIR=\"${backenddir}\" -DIPSEC_INTERFACEDIR=\"${interfacedir}\" \
+ -DSIM_READER_LIB=\"${simreader}\"
charon_LDADD = $(top_builddir)/src/libstrongswan/libstrongswan.la -lgmp -lpthread -lm -ldl
if USE_LIBCURL
@@ -126,6 +127,10 @@ if USE_EAP_SIM
eap_LTLIBRARIES += libcharon-eapsim.la
libcharon_eapsim_la_SOURCES = sa/authenticators/eap/eap_sim.h sa/authenticators/eap/eap_sim.c
libcharon_eapsim_la_LDFLAGS = -module
+
+ plugin_LTLIBRARIES = libcharon-eapsim-file.la
+ libcharon_eapsim_file_la_SOURCES = sa/authenticators/eap/sim/eap_sim_file.c
+ libcharon_eapsim_file_la_LDFLAGS = -module
endif
if USE_EAP_MD5
diff --git a/src/charon/sa/authenticators/eap/eap_sim.c b/src/charon/sa/authenticators/eap/eap_sim.c
index c9eb5ce8f..90898fb46 100644
--- a/src/charon/sa/authenticators/eap/eap_sim.c
+++ b/src/charon/sa/authenticators/eap/eap_sim.c
@@ -29,6 +29,21 @@
#define MAX_TRIES 3
+/* number of triplets for one authentication */
+#define TRIPLET_COUNT 3
+
+typedef enum sim_subtype_t sim_subtype_t;
+
+/**
+ * Subtypes of SIM messages
+ */
+enum sim_subtype_t {
+ SIM_START = 10,
+ SIM_CHALLENGE = 11,
+ SIM_NOTIFICATION = 12,
+ SIM_CLIENT_ERROR = 14,
+};
+
ENUM(sim_subtype_names, SIM_START, SIM_CLIENT_ERROR,
"SIM_START",
"SIM_CHALLENGE",
@@ -37,6 +52,40 @@ ENUM(sim_subtype_names, SIM_START, SIM_CLIENT_ERROR,
"SIM_CLIENT_ERROR",
);
+typedef enum sim_attribute_t sim_attribute_t;
+
+/**
+ * Attributes in SIM messages
+ */
+enum sim_attribute_t {
+ /** defines the end of attribute list */
+ AT_END = -1,
+ AT_RAND = 1,
+ AT_AUTN = 2,
+ AT_RES = 3,
+ AT_AUTS = 4,
+ AT_PADDING = 6,
+ AT_NONCE_MT = 7,
+ AT_PERMANENT_ID_REQ = 10,
+ AT_MAC = 11,
+ AT_NOTIFICATION = 12,
+ AT_ANY_ID_REQ = 13,
+ AT_IDENTITY = 14,
+ AT_VERSION_LIST = 15,
+ AT_SELECTED_VERSION = 16,
+ AT_FULLAUTH_ID_REQ = 17,
+ AT_COUNTER = 19,
+ AT_COUNTER_TOO_SMALL = 20,
+ AT_NONCE_S = 21,
+ AT_CLIENT_ERROR_CODE = 22,
+ AT_IV = 129,
+ AT_ENCR_DATA = 130,
+ AT_NEXT_PSEUDONYM = 132,
+ AT_NEXT_REAUTH_ID = 133,
+ AT_CHECKCODE = 134,
+ AT_RESULT_IND = 135,
+};
+
ENUM_BEGIN(sim_attribute_names, AT_END, AT_CLIENT_ERROR_CODE,
"AT_END",
"AT_0",
@@ -96,6 +145,11 @@ struct private_eap_sim_t {
sim_algo_t alg;
/**
+ * libraries get_triplet() function returning a triplet
+ */
+ sim_get_triplet_t get_triplet;
+
+ /**
* handle of the loaded library
*/
void *handle;
@@ -106,6 +160,16 @@ struct private_eap_sim_t {
int tries;
/**
+ * unique EAP identifier
+ */
+ u_int8_t identifier;
+
+ /**
+ * EAP message type this role sends
+ */
+ u_int8_t type;
+
+ /**
* version this implementation uses
*/
chunk_t version;
@@ -121,6 +185,11 @@ struct private_eap_sim_t {
chunk_t nonce;
/**
+ * concatenated SRES values
+ */
+ chunk_t sreses;
+
+ /**
* k_encr key derived from MK
*/
chunk_t k_encr;
@@ -147,6 +216,10 @@ struct private_eap_sim_t {
#define MAC_LEN 16
/** length of the AT_RAND value */
#define RAND_LEN 16
+/** length of Kc */
+#define KC_LEN 8
+/** length of SRES */
+#define SRES_LEN 4
/** length of the k_encr key */
#define KENCR_LEN 16
/** length of the k_auth key */
@@ -156,6 +229,7 @@ struct private_eap_sim_t {
/** length of the EMSK */
#define EMSK_LEN 64
+static char version[] = {0x00,0x01};
/* client error codes used in AT_CLIENT_ERROR_CODE */
char client_error_general_buf[] = {0x00, 0x01};
char client_error_unsupported_buf[] = {0x00, 0x02};
@@ -229,7 +303,7 @@ static eap_payload_t *build_payload(private_eap_sim_t *this, u_int8_t identifier
chunk_t mac_data = chunk_empty;
/* write EAP header, skip length bytes */
- *pos.ptr++ = EAP_RESPONSE;
+ *pos.ptr++ = this->type;
*pos.ptr++ = identifier;
pos.ptr += 2;
pos.len -= 4;
@@ -263,6 +337,7 @@ static eap_payload_t *build_payload(private_eap_sim_t *this, u_int8_t identifier
break;
}
case AT_IDENTITY:
+ case AT_VERSION_LIST:
{
u_int16_t act_len = data.len;
/* align up to four byte */
@@ -346,8 +421,8 @@ static eap_payload_t *build_payload(private_eap_sim_t *this, u_int8_t identifier
/**
* process an EAP-SIM/Request/Start message
*/
-static status_t process_start(private_eap_sim_t *this, eap_payload_t *in,
- eap_payload_t **out)
+static status_t peer_process_start(private_eap_sim_t *this, eap_payload_t *in,
+ eap_payload_t **out)
{
chunk_t message, data;
sim_attribute_t attribute, include_id = AT_END;
@@ -440,18 +515,56 @@ static status_t process_start(private_eap_sim_t *this, eap_payload_t *in,
}
/**
+ * derive EAP keys from kc
+ */
+static void derive_keys(private_eap_sim_t *this, chunk_t kcs)
+{
+ chunk_t tmp, mk;
+ hasher_t *hasher;
+ prf_t *prf;
+ int i;
+
+ /* build MK = SHA1(Identity|n*Kc|NONCE_MT|Version List|Selected Version) */
+ tmp = chunk_cata("ccccc", this->peer->get_encoding(this->peer), kcs,
+ this->nonce, this->version_list, this->version);
+ hasher = hasher_create(HASH_SHA1);
+ mk = chunk_alloca(hasher->get_hash_size(hasher));
+ hasher->get_hash(hasher, tmp, mk.ptr);
+ hasher->destroy(hasher);
+ DBG3(DBG_IKE, "MK = SHA1(%B\n) = %B", &tmp, &mk);
+
+ /* K_encr | K_auth | MSK | EMSK = prf() | prf() | prf() | prf()
+ * FIPS PRF has 320 bit block size, we need 160 byte for keys
+ * => run prf four times */
+ prf = prf_create(PRF_FIPS_SHA1_160);
+ prf->set_key(prf, mk);
+ tmp = chunk_alloca(prf->get_block_size(prf) * 4);
+ for (i = 0; i < 4; i++)
+ {
+ prf->get_bytes(prf, chunk_empty, tmp.ptr + tmp.len / 4 * i);
+ }
+ prf->destroy(prf);
+ chunk_free(&this->k_encr);
+ chunk_free(&this->k_auth);
+ chunk_free(&this->msk);
+ chunk_free(&this->emsk);
+ chunk_split(tmp, "aaaa", KENCR_LEN, &this->k_encr, KAUTH_LEN, &this->k_auth,
+ MSK_LEN, &this->msk, EMSK_LEN, &this->emsk);
+ DBG3(DBG_IKE, "K_encr %B\nK_auth %B\nMSK %B\nEMSK %B",
+ &this->k_encr, &this->k_auth, &this->msk, &this->emsk);
+}
+
+/**
* process an EAP-SIM/Request/Challenge message
*/
-static status_t process_challenge(private_eap_sim_t *this, eap_payload_t *in,
- eap_payload_t **out)
+static status_t peer_process_challenge(private_eap_sim_t *this,
+ eap_payload_t *in, eap_payload_t **out)
{
- chunk_t message, data, tmp, kcs, kc, sreses, sres, mk;
+ chunk_t message, data, tmp, kcs, kc, sreses, sres;
sim_attribute_t attribute;
- u_int8_t identifier, i;
+ u_int8_t identifier;
chunk_t mac = chunk_empty, rands = chunk_empty;
signer_t *signer;
- hasher_t *hasher;
- prf_t *prf;
if (this->tries-- <= 0)
{
@@ -541,7 +654,7 @@ static status_t process_challenge(private_eap_sim_t *this, eap_payload_t *in,
if (this->alg(rands.ptr, RAND_LEN, sres.ptr, &sres_len, kc.ptr, &kc_len))
{
- DBG1(DBG_IKE, "unable to get triplets from SIM");
+ DBG1(DBG_IKE, "unable to get EAP-SIM triplet");
*out = build_payload(this, identifier, SIM_CLIENT_ERROR,
AT_CLIENT_ERROR_CODE, client_error_general,
AT_END);
@@ -554,34 +667,7 @@ static status_t process_challenge(private_eap_sim_t *this, eap_payload_t *in,
rands = chunk_skip(rands, RAND_LEN);
}
- /* build MK = SHA1(Identity|n*Kc|NONCE_MT|Version List|Selected Version) */
- tmp = chunk_cata("ccccc", this->peer->get_encoding(this->peer), kcs,
- this->nonce, this->version_list, this->version);
- hasher = hasher_create(HASH_SHA1);
- mk = chunk_alloca(hasher->get_hash_size(hasher));
- hasher->get_hash(hasher, tmp, mk.ptr);
- hasher->destroy(hasher);
- DBG3(DBG_IKE, "MK = SHA1(%B\n) = %B", &tmp, &mk);
-
- /* K_encr | K_auth | MSK | EMSK = prf() | prf() | prf() | prf()
- * FIPS PRF has 320 bit block size, we need 160 byte for keys
- * => run prf four times */
- prf = prf_create(PRF_FIPS_SHA1_160);
- prf->set_key(prf, mk);
- tmp = chunk_alloca(prf->get_block_size(prf) * 4);
- for (i = 0; i < 4; i++)
- {
- prf->get_bytes(prf, chunk_empty, tmp.ptr + tmp.len / 4 * i);
- }
- prf->destroy(prf);
- chunk_free(&this->k_encr);
- chunk_free(&this->k_auth);
- chunk_free(&this->msk);
- chunk_free(&this->emsk);
- chunk_split(tmp, "aaaa", KENCR_LEN, &this->k_encr, KAUTH_LEN, &this->k_auth,
- MSK_LEN, &this->msk, EMSK_LEN, &this->emsk);
- DBG3(DBG_IKE, "K_encr %B\nK_auth %B\nMSK %B\nEMSK %B",
- &this->k_encr, &this->k_auth, &this->msk, &this->emsk);
+ derive_keys(this, kcs);
/* verify AT_MAC attribute, signature is over "EAP packet | NONCE_MT" */
signer = signer_create(AUTH_HMAC_SHA1_128);
@@ -606,10 +692,144 @@ static status_t process_challenge(private_eap_sim_t *this, eap_payload_t *in,
}
/**
+ * process an EAP-SIM/Response/Challenge message
+ */
+static status_t server_process_challenge(private_eap_sim_t *this,
+ eap_payload_t *in, eap_payload_t **out)
+{
+ chunk_t message, data;
+ sim_attribute_t attribute;
+ chunk_t mac = chunk_empty, tmp;
+ signer_t *signer;
+
+ message = in->get_data(in);
+ read_header(&message);
+
+ while ((attribute = read_attribute(&message, &data)) != AT_END)
+ {
+ switch (attribute)
+ {
+ case AT_MAC:
+ /* MAC has two reserved bytes */
+ if (data.len == MAC_LEN + 2)
+ { /* clone and zero MAC for verification */
+ mac = chunk_clonea(chunk_skip(data, 2));
+ memset(data.ptr, 0, data.len);
+ }
+ break;
+ default:
+ DBG1(DBG_IKE, "ignoring EAP_SIM attribute %N",
+ sim_attribute_names, attribute);
+ break;
+ }
+ }
+ if (!mac.ptr)
+ {
+ DBG1(DBG_IKE, "no valid AT_MAC attribute received");
+ return FAILED;
+ }
+ /* verify AT_MAC attribute, signature is over "EAP packet | n*SRES" */
+ signer = signer_create(AUTH_HMAC_SHA1_128);
+ signer->set_key(signer, this->k_auth);
+ tmp = chunk_cata("cc", in->get_data(in), this->sreses);
+ if (!signer->verify_signature(signer, tmp, mac))
+ {
+ DBG1(DBG_IKE, "AT_MAC verification failed");
+ signer->destroy(signer);
+ return FAILED;
+ }
+ signer->destroy(signer);
+ return SUCCESS;
+}
+
+/**
+ * process an EAP-SIM/Response/Start message
+ */
+static status_t server_process_start(private_eap_sim_t *this,
+ eap_payload_t *in, eap_payload_t **out)
+{
+ chunk_t message, data;
+ sim_attribute_t attribute;
+ bool supported = FALSE;
+ chunk_t rands, rand, kcs, kc, sreses, sres;
+ char id[64];
+ int len, i, rand_len, kc_len, sres_len;
+
+ message = in->get_data(in);
+ read_header(&message);
+
+ while ((attribute = read_attribute(&message, &data)) != AT_END)
+ {
+ switch (attribute)
+ {
+ case AT_NONCE_MT:
+ if (data.len == NONCE_LEN + 2)
+ {
+ this->nonce = chunk_clone(chunk_skip(data, 2));
+ }
+ break;
+ case AT_SELECTED_VERSION:
+ if (chunk_equals(data, this->version))
+ {
+ supported = TRUE;
+ }
+ break;
+ default:
+ DBG1(DBG_IKE, "ignoring EAP_SIM attribute %N",
+ sim_attribute_names, attribute);
+ break;
+ }
+ }
+ if (!supported || !this->nonce.ptr)
+ {
+ DBG1(DBG_IKE, "received incomplete EAP-SIM/Response/Start");
+ return FAILED;
+ }
+ len = snprintf(id, sizeof(id), "%D", this->peer);
+ if (len > sizeof(id) || len < 0)
+ {
+ return FAILED;
+ }
+
+ /* read triplets from provider */
+ rand = rands = chunk_alloca(RAND_LEN * TRIPLET_COUNT);
+ kc = kcs = chunk_alloca(KC_LEN * TRIPLET_COUNT);
+ sres = sreses = chunk_alloca(SRES_LEN * TRIPLET_COUNT);
+ rands.len = 0;
+ kcs.len = 0;
+ sreses.len = 0;
+ for (i = 0; i < TRIPLET_COUNT; i++)
+ {
+ rand_len = RAND_LEN;
+ kc_len = KC_LEN;
+ sres_len = SRES_LEN;
+ if (this->get_triplet(id, rand.ptr, &rand_len, sres.ptr, &sres_len,
+ kc.ptr, &kc_len))
+ {
+ DBG1(DBG_IKE, "getting EAP-SIM triplet %d failed", i);
+ return FAILED;
+ }
+ rands.len += rand_len;
+ kcs.len += kc_len;
+ sreses.len += sres_len;
+ rand = chunk_skip(rand, rand_len);
+ kc = chunk_skip(kc, kc_len);
+ sres = chunk_skip(sres, sres_len);
+ }
+ derive_keys(this, kcs);
+
+ /* build MAC over "EAP packet | NONCE_MT" */
+ *out = build_payload(this, this->identifier++, SIM_CHALLENGE, AT_RAND,
+ rands, AT_MAC, this->nonce, AT_END);
+ this->sreses = chunk_clone(sreses);
+ return NEED_MORE;
+}
+
+/**
* process an EAP-SIM/Request/Notification message
*/
-static status_t process_notification(private_eap_sim_t *this, eap_payload_t *in,
- eap_payload_t **out)
+static status_t peer_process_notification(private_eap_sim_t *this,
+ eap_payload_t *in, eap_payload_t **out)
{
chunk_t message, data;
sim_attribute_t attribute;
@@ -656,12 +876,44 @@ static status_t process_notification(private_eap_sim_t *this, eap_payload_t *in,
return NEED_MORE;
}
+/**
+ * Process a client error
+ */
+static status_t server_process_client_error(private_eap_sim_t *this,
+ eap_payload_t *in, eap_payload_t **out)
+{
+ chunk_t message, data;
+ sim_attribute_t attribute;
+
+ message = in->get_data(in);
+ read_header(&message);
+
+ while ((attribute = read_attribute(&message, &data)) != AT_END)
+ {
+ if (attribute == AT_CLIENT_ERROR_CODE)
+ {
+ u_int16_t code = 0;
+ if (data.len == 2)
+ {
+ code = ntohs(*(u_int16_t*)data.ptr);
+ }
+ DBG1(DBG_IKE, "received %N error %d",
+ sim_attribute_names, attribute, code);
+ }
+ else
+ {
+ DBG1(DBG_IKE, "ignoring EAP_SIM attribute %N",
+ sim_attribute_names, attribute);
+ }
+ }
+ return FAILED;
+}
/**
* Implementation of eap_method_t.process for the peer
*/
-static status_t process(private_eap_sim_t *this,
- eap_payload_t *in, eap_payload_t **out)
+static status_t peer_process(private_eap_sim_t *this,
+ eap_payload_t *in, eap_payload_t **out)
{
sim_subtype_t type;
chunk_t message;
@@ -672,11 +924,11 @@ static status_t process(private_eap_sim_t *this,
switch (type)
{
case SIM_START:
- return process_start(this, in, out);
+ return peer_process_start(this, in, out);
case SIM_CHALLENGE:
- return process_challenge(this, in, out);
+ return peer_process_challenge(this, in, out);
case SIM_NOTIFICATION:
- return process_notification(this, in, out);
+ return peer_process_notification(this, in, out);
default:
DBG1(DBG_IKE, "unable to process EAP_SIM subtype %N",
sim_subtype_names, type);
@@ -687,15 +939,55 @@ static status_t process(private_eap_sim_t *this,
}
/**
+ * Implementation of eap_method_t.process for the server
+ */
+static status_t server_process(private_eap_sim_t *this,
+ eap_payload_t *in, eap_payload_t **out)
+{
+ sim_subtype_t type;
+ chunk_t message;
+
+ message = in->get_data(in);
+ type = read_header(&message);
+
+ switch (type)
+ {
+ case SIM_START:
+ return server_process_start(this, in, out);
+ case SIM_CHALLENGE:
+ return server_process_challenge(this, in, out);
+ case SIM_CLIENT_ERROR:
+ return server_process_client_error(this, in, out);
+ default:
+ DBG1(DBG_IKE, "unable to process EAP_SIM subtype %N",
+ sim_subtype_names, type);
+ return FAILED;
+ }
+}
+
+/**
* Implementation of eap_method_t.initiate for the peer
*/
-static status_t initiate(private_eap_sim_t *this, eap_payload_t **out)
+static status_t peer_initiate(private_eap_sim_t *this, eap_payload_t **out)
{
/* peer never initiates */
return FAILED;
}
/**
+ * Implementation of eap_method_t.initiate for the server
+ */
+static status_t server_initiate(private_eap_sim_t *this, eap_payload_t **out)
+{
+ /* version_list to derive MK, no padding */
+ this->version_list = chunk_clone(this->version);
+ /* build_payloads adds padding itself */
+ *out = build_payload(this, this->identifier++, SIM_START,
+ AT_VERSION_LIST, this->version, AT_END);
+ return NEED_MORE;
+}
+
+/**
* Implementation of eap_method_t.get_type.
*/
static eap_type_t get_type(private_eap_sim_t *this, u_int32_t *vendor)
@@ -732,6 +1024,7 @@ static void destroy(private_eap_sim_t *this)
{
dlclose(this->handle);
chunk_free(&this->nonce);
+ chunk_free(&this->sreses);
chunk_free(&this->version_list);
chunk_free(&this->k_auth);
chunk_free(&this->k_encr);
@@ -748,60 +1041,85 @@ eap_sim_t *eap_create(eap_role_t role,
{
private_eap_sim_t *this;
randomizer_t *randomizer;
- static char version[] = {0x00,0x01};
-
- if (role != EAP_PEER)
- {
- return NULL;
- }
- this = malloc_thing(private_eap_sim_t);
+ void *symbol;
+ char *name;
+
+ this = malloc_thing(private_eap_sim_t);
+ this->alg = NULL;
+ this->get_triplet = NULL;
+ this->nonce = chunk_empty;
+ this->sreses = chunk_empty;
+ this->peer = peer;
+ this->tries = MAX_TRIES;
+ this->version.ptr = version;
+ this->version.len = sizeof(version);
+ this->version_list = chunk_empty;
+ this->k_auth = chunk_empty;
+ this->k_encr = chunk_empty;
+ this->msk = chunk_empty;
+ this->emsk = chunk_empty;
+ this->identifier = random();
this->handle = dlopen(SIM_READER_LIB, RTLD_LAZY);
if (this->handle == NULL)
{
- DBG1(DBG_IKE, "unable to open SIM reader '%s'", SIM_READER_LIB);
+ DBG1(DBG_IKE, "unable to open SIM reader '%s'", SIM_READER_LIB);
free(this);
return NULL;
}
- this->alg = dlsym(this->handle, SIM_READER_ALG);
- if (this->alg == NULL)
+ switch (role)
{
- DBG1(DBG_IKE, "unable to open SIM reader function '%s' in '%s'",
- SIM_READER_ALG, SIM_READER_LIB);
+ case EAP_PEER:
+ name = SIM_READER_ALG;
+ break;
+ case EAP_SERVER:
+ name = SIM_READER_GET_TRIPLET;
+ break;
+ default:
+ free(this);
+ return NULL;
+ }
+ symbol = dlsym(this->handle, name);
+ if (symbol == NULL)
+ {
+ DBG1(DBG_IKE, "unable to open SIM function '%s' in '%s'",
+ name, SIM_READER_LIB);
dlclose(this->handle);
free(this);
return NULL;
}
-
- randomizer = randomizer_create();
- if (randomizer->allocate_pseudo_random_bytes(randomizer, NONCE_LEN,
- &this->nonce))
+ switch (role)
{
- DBG1(DBG_IKE, "unable to generate NONCE for EAP_SIM");
- randomizer->destroy(randomizer);
- free(this);
- return NULL;
+ case EAP_SERVER:
+ this->public.eap_method_interface.initiate = (status_t(*)(eap_method_t*,eap_payload_t**))server_initiate;
+ this->public.eap_method_interface.process = (status_t(*)(eap_method_t*,eap_payload_t*,eap_payload_t**))server_process;
+ this->get_triplet = symbol;
+ this->type = EAP_REQUEST;
+ break;
+ case EAP_PEER:
+ this->public.eap_method_interface.initiate = (status_t(*)(eap_method_t*,eap_payload_t**))peer_initiate;
+ this->public.eap_method_interface.process = (status_t(*)(eap_method_t*,eap_payload_t*,eap_payload_t**))peer_process;
+ this->alg = symbol;
+ this->type = EAP_RESPONSE;
+ randomizer = randomizer_create();
+ if (randomizer->allocate_pseudo_random_bytes(randomizer, NONCE_LEN,
+ &this->nonce))
+ {
+ DBG1(DBG_IKE, "unable to generate NONCE for EAP_SIM");
+ randomizer->destroy(randomizer);
+ free(this);
+ return NULL;
+ }
+ randomizer->destroy(randomizer);
+ break;
+ default:
+ free(this);
+ return NULL;
}
- randomizer->destroy(randomizer);
-
- /* public functions */
- this->public.eap_method_interface.initiate = (status_t(*)(eap_method_t*,eap_payload_t**))initiate;
- this->public.eap_method_interface.process = (status_t(*)(eap_method_t*,eap_payload_t*,eap_payload_t**))process;
this->public.eap_method_interface.get_type = (eap_type_t(*)(eap_method_t*,u_int32_t*))get_type;
this->public.eap_method_interface.is_mutual = (bool(*)(eap_method_t*))is_mutual;
this->public.eap_method_interface.get_msk = (status_t(*)(eap_method_t*,chunk_t*))get_msk;
this->public.eap_method_interface.destroy = (void(*)(eap_method_t*))destroy;
- /* private data */
- this->peer = peer;
- this->tries = MAX_TRIES;
- this->version.ptr = version;
- this->version.len = sizeof(version);
- this->version_list = chunk_empty;
- this->k_auth = chunk_empty;
- this->k_encr = chunk_empty;
- this->msk = chunk_empty;
- this->emsk = chunk_empty;
-
return &this->public;
}
diff --git a/src/charon/sa/authenticators/eap/eap_sim.h b/src/charon/sa/authenticators/eap/eap_sim.h
index 10640babe..d50cf7397 100644
--- a/src/charon/sa/authenticators/eap/eap_sim.h
+++ b/src/charon/sa/authenticators/eap/eap_sim.h
@@ -24,59 +24,13 @@
#define EAP_SIM_H_
typedef struct eap_sim_t eap_sim_t;
-typedef enum sim_subtype_t sim_subtype_t;
-typedef enum sim_attribute_t sim_attribute_t;
#include <sa/authenticators/eap/eap_method.h>
-/**
- * Subtypes of SIM messages
- */
-enum sim_subtype_t {
- SIM_START = 10,
- SIM_CHALLENGE = 11,
- SIM_NOTIFICATION = 12,
- SIM_CLIENT_ERROR = 14,
-};
-
-/**
- * enum names for sim_subtype_t
- */
-extern enum_name_t *sim_subtype_names;
-
-enum sim_attribute_t {
- /** defines the end of attribute list */
- AT_END = -1,
- AT_RAND = 1,
- AT_AUTN = 2,
- AT_RES = 3,
- AT_AUTS = 4,
- AT_PADDING = 6,
- AT_NONCE_MT = 7,
- AT_PERMANENT_ID_REQ = 10,
- AT_MAC = 11,
- AT_NOTIFICATION = 12,
- AT_ANY_ID_REQ = 13,
- AT_IDENTITY = 14,
- AT_VERSION_LIST = 15,
- AT_SELECTED_VERSION = 16,
- AT_FULLAUTH_ID_REQ = 17,
- AT_COUNTER = 19,
- AT_COUNTER_TOO_SMALL = 20,
- AT_NONCE_S = 21,
- AT_CLIENT_ERROR_CODE = 22,
- AT_IV = 129,
- AT_ENCR_DATA = 130,
- AT_NEXT_PSEUDONYM = 132,
- AT_NEXT_REAUTH_ID = 133,
- AT_CHECKCODE = 134,
- AT_RESULT_IND = 135,
-};
-
-/**
- * enum names for sim_subtype_t
- */
-extern enum_name_t *sim_attribute_names;
+/** the library containing with the triplet functions */
+#ifndef SIM_READER_LIB
+#error SIM_READER_LIB not specified, use --with-sim-reader option
+#endif /* SIM_READER_LIB */
/**
* @brief Cardreaders SIM function.
@@ -93,24 +47,42 @@ typedef int (*sim_algo_t)(const unsigned char *rand, int rand_length,
unsigned char *sres, int *sres_length,
unsigned char *kc, int *kc_length);
-#ifndef SIM_READER_LIB
-/** the library containing the cardreader with the SIM function */
-#error SIM_READER_LIB not specified, use --with-sim-reader option
-#endif /* SIM_READER_LIB */
-
#ifndef SIM_READER_ALG
/** the SIM_READER_LIB's algorithm, uses sim_algo_t signature */
#define SIM_READER_ALG "sim_run_alg"
#endif /* SIM_READER_ALG */
+/**
+ * @brief Function to get a SIM triplet.
+ *
+ * @param identity identity (imsi) to get a triplet for
+ * @param rand buffer to get RAND
+ * @param rand_length size of buffer in rand, returns bytes written to RAND
+ * @param sres buffer to get SRES
+ * @param sres_length size of buffer in sres, returns bytes written to SRES
+ * @param kc buffer to get Kc
+ * @param kc_length size of buffer in Kc, returns bytes written to Kc
+ * @return zero on success
+ */
+typedef int (*sim_get_triplet_t)(char *identity,
+ unsigned char *rand, int *rand_length,
+ unsigned char *sres, int *sres_length,
+ unsigned char *kc, int *kc_length);
+
+#ifndef SIM_READER_GET_TRIPLET
+/** the SIM_READER_LIB's get-triplet function, uses sim_get_triplet_t signature */
+#define SIM_READER_GET_TRIPLET "sim_get_triplet"
+#endif /* SIM_READER_GET_TRIPLET */
/**
* @brief Implementation of the eap_method_t interface using EAP-SIM.
*
* This EAP-SIM client implementation uses another pluggable library to
- * access the SIM card. This module is specified using the SIM_READER_LIB
- * definition. The function to run the algorithm has the sim_algo_t type and
- * is named as SIM_READER_ALG is defined.
+ * access the SIM card/triplet provider. This module is specified using the
+ * SIM_READER_LIB definition. It has to privde a sim_run_alg() function to
+ * calculate a triplet (client), and/or a sim_get_triplet() function to get
+ * a triplet (server). These functions are named to the SIM_READER_ALG and
+ * the SIM_READER_GET_TRIPLET definitions.
*
* @b Constructors:
* - eap_create() of this module
@@ -129,6 +101,7 @@ struct eap_sim_t {
/**
* @brief Creates the EAP method EAP-SIM.
*
+ * @param role role of the module, client/server
* @param server ID of the EAP server
* @param peer ID of the EAP client
* @return eap_sim_t object
diff --git a/src/charon/sa/authenticators/eap/sim/eap_sim_file.c b/src/charon/sa/authenticators/eap/sim/eap_sim_file.c
new file mode 100644
index 000000000..2ab45a578
--- /dev/null
+++ b/src/charon/sa/authenticators/eap/sim/eap_sim_file.c
@@ -0,0 +1,288 @@
+/**
+ * @file eap_sim.h
+ *
+ * @brief Interface of eap_sim_t.
+ *
+ */
+
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ */
+
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+
+#include <daemon.h>
+
+#define IMSI_LEN 64
+#define RAND_LEN 16
+#define SRES_LEN 4
+#define KC_LEN 8
+
+typedef struct triplet_t triplet_t;
+
+struct triplet_t {
+ unsigned char imsi[IMSI_LEN];
+ unsigned char rand[RAND_LEN];
+ unsigned char sres[SRES_LEN];
+ unsigned char kc[KC_LEN];
+};
+
+static triplet_t *triplets = NULL;
+static int triplet_count = 0;
+
+#define TRIPLET_FILE IPSEC_CONFDIR "/ipsec.d/triplets.dat"
+
+/**
+ * convert a single HEX char to its integer value
+ */
+static int hexchr(char chr)
+{
+ switch (chr)
+ {
+ case '0'...'9':
+ return chr - '0';
+ case 'A'...'F':
+ return 10 + chr - 'A';
+ case 'a'...'f':
+ return 10 + chr - 'a';
+ }
+ return 0;
+}
+
+/**
+ * convert a HEX string into a char array bin, limited by array length len
+ */
+static void hex2bin(char *hex, unsigned char *bin, size_t len)
+{
+ char *pos;
+ int i, even = 1;
+
+ pos = hex - 1;
+ /* find the end, as we convert bottom up */
+ while (TRUE)
+ {
+ switch (*(pos+1))
+ {
+ case '0'...'9':
+ case 'A'...'F':
+ case 'a'...'f':
+ pos++;
+ continue;
+ }
+ break;
+ }
+ /* convert two hex chars into a single bin byte */
+ for (i = 0; pos >= hex && i < len; pos--)
+ {
+ if (even)
+ {
+ bin[len - 1 - i] = hexchr(*pos);
+ }
+ else
+ {
+ bin[len - 1 - i] |= 16 * hexchr(*pos);
+ i++;
+ }
+ even = !even;
+ }
+}
+
+/**
+ * free up allocated triplets
+ */
+static void __attribute__ ((destructor)) free_triplets()
+{
+ free(triplets);
+}
+
+/**
+ * read the triplets from the file, using freeradius triplet file syntax:
+ * http://www.freeradius.org/radiusd/doc/rlm_sim_triplets
+ */
+static void __attribute__ ((constructor)) read_triplets()
+{
+ char line[512], *data[4], *pos;
+ FILE *file;
+ int i, nr = 0;
+ triplet_t *triplet;
+
+ file = fopen(TRIPLET_FILE, "r");
+ if (file == NULL)
+ {
+ DBG1(DBG_CFG, "opening triplet file %s failed: %s",
+ TRIPLET_FILE, strerror(errno));
+ return;
+ }
+
+ if (triplets)
+ {
+ free(triplets);
+ triplets = NULL;
+ triplet_count = 0;
+ }
+
+ /* read line by line */
+ while (fgets(line, sizeof(line), file))
+ {
+ nr++;
+ /* skip comments, empty lines */
+ switch (line[0])
+ {
+ case '\n':
+ case '\r':
+ case '#':
+ case '\0':
+ continue;
+ default:
+ break;
+ }
+ /* read comma separated values */
+ pos = line;
+ for (i = 0; i < 4; i++)
+ {
+ data[i] = pos;
+ pos = strchr(pos, ',');
+ if (pos)
+ {
+ *pos = '\0';
+ pos++;
+ }
+ else if (i != 3)
+ {
+ DBG1(DBG_CFG, "error in triplet file, line %d", nr);
+ fclose(file);
+ return;
+ }
+ }
+ /* allocate new triplet */
+ triplet_count++;
+ triplets = realloc(triplets, triplet_count * sizeof(triplet_t));
+ triplet = &triplets[triplet_count - 1];
+ memset(triplet, 0, sizeof(triplet_t));
+
+ /* convert/copy triplet data */
+ for (i = 0; i < IMSI_LEN - 1; i++)
+ {
+ switch (data[0][i])
+ {
+ case '\n':
+ case '\r':
+ case '\0':
+ break;
+ default:
+ triplet->imsi[i] = data[0][i];
+ continue;
+ }
+ break;
+ }
+ hex2bin(data[1], triplet->rand, RAND_LEN);
+ hex2bin(data[2], triplet->sres, SRES_LEN);
+ hex2bin(data[3], triplet->kc, KC_LEN);
+
+ DBG4(DBG_CFG, "triplet: imsi %b\nrand %b\nsres %b\nkc %b",
+ triplet->imsi, IMSI_LEN, triplet->rand, RAND_LEN,
+ triplet->sres, SRES_LEN, triplet->kc, KC_LEN);
+ }
+ fclose(file);
+ DBG2(DBG_CFG, "read %d triplets from %s", triplet_count, TRIPLET_FILE);
+}
+
+/**
+ * Run the sim algorithm, see eap_sim.h
+ */
+int sim_run_alg(const unsigned char *rand, int rand_length,
+ unsigned char *sres, int *sres_length,
+ unsigned char *kc, int *kc_length)
+{
+ int current;
+
+ if (rand_length != RAND_LEN ||
+ *sres_length < SRES_LEN ||
+ *kc_length < KC_LEN)
+ {
+ return 1;
+ }
+
+ for (current = 0; current < triplet_count; current++)
+ {
+ if (memcmp(triplets[current].rand, rand, RAND_LEN) == 0)
+ {
+ memcpy(sres, triplets[current].sres, SRES_LEN);
+ memcpy(kc, triplets[current].kc, KC_LEN);
+ *sres_length = SRES_LEN;
+ *kc_length = KC_LEN;
+ return 0;
+ }
+ }
+ return 2;
+}
+
+/**
+ * Get a single triplet, see_eap_sim.h
+ */
+int sim_get_triplet(char *imsi,
+ unsigned char *rand, int *rand_length,
+ unsigned char *sres, int *sres_length,
+ unsigned char *kc, int *kc_length)
+{
+ int current;
+ triplet_t *triplet;
+ static int skip = -1;
+
+ DBG2(DBG_CFG, "getting triplet for %s", imsi);
+
+ if (*rand_length < RAND_LEN ||
+ *sres_length < SRES_LEN ||
+ *kc_length < KC_LEN)
+ {
+ return 1;
+ }
+ if (triplet_count == 0)
+ {
+ return 2;
+ }
+ for (current = 0; current < triplet_count; current++)
+ {
+ triplet = &triplets[current];
+
+ if (streq(imsi, triplet->imsi))
+ {
+ /* skip triplet if already used */
+ if (skip >= current)
+ {
+ continue;
+ }
+ *rand_length = RAND_LEN;
+ *sres_length = SRES_LEN;
+ *kc_length = KC_LEN;
+ memcpy(rand, triplet->rand, RAND_LEN);
+ memcpy(sres, triplet->sres, SRES_LEN);
+ memcpy(kc, triplet->kc, KC_LEN);
+ /* remember used triplet */
+ skip = current;
+ return 0;
+ }
+ }
+ if (skip > -1)
+ {
+ /* no triplet left, reuse triplets */
+ skip = -1;
+ return sim_get_triplet(imsi, rand, rand_length,
+ sres, sres_length, kc, kc_length);
+ }
+ return 2;
+}
+
diff --git a/testing/tests/ikev2/rw-eap-sim-rsa/description.txt b/testing/tests/ikev2/rw-eap-sim-rsa/description.txt
new file mode 100644
index 000000000..5fc75e1b1
--- /dev/null
+++ b/testing/tests/ikev2/rw-eap-sim-rsa/description.txt
@@ -0,0 +1,7 @@
+The roadwarrior <b>carol</b> sets up a connection to gateway <b>moon</b>.
+<b>carol</b> uses the <i>Extensible Authentication Protocol</i>
+in association with a GSM <i>Subscriber Identity Module</i> (<b>EAP-SIM</b>)
+to authenticate against the gateway. In this scenario triplets from the file
+<b>/etc/ipsec.d/triplets.dat</b> are used instead of a physical SIM card.
+Gateway <b>moon</b> additionaly uses an <b>RSA signature</b> to authenticate
+itself against <b>carol</b>.
diff --git a/testing/tests/ikev2/rw-eap-sim-rsa/evaltest.dat b/testing/tests/ikev2/rw-eap-sim-rsa/evaltest.dat
new file mode 100644
index 000000000..194434a1e
--- /dev/null
+++ b/testing/tests/ikev2/rw-eap-sim-rsa/evaltest.dat
@@ -0,0 +1,10 @@
+carol::cat /var/log/daemon.log::authentication of 'moon.strongswan.org' with RSA signature successful::YES
+carol::cat /var/log/daemon.log::authentication of 'moon.strongswan.org' with EAP successful::YES
+moon::cat /var/log/daemon.log::authentication of 'carol@strongswan.org' with EAP successful::YES
+moon::ipsec statusall::rw-eapsim.*ESTABLISHED::YES
+carol::ipsec statusall::home.*ESTABLISHED::YES
+carol::ping -c 1 PH_IP_ALICE::64 bytes from PH_IP_ALICE: icmp_seq=1::YES
+moon::tcpdump::IP carol.strongswan.org > moon.strongswan.org: ESP::YES
+moon::tcpdump::IP moon.strongswan.org > carol.strongswan.org: ESP::YES
+
+
diff --git a/testing/tests/ikev2/rw-eap-sim-rsa/hosts/carol/etc/ipsec.conf b/testing/tests/ikev2/rw-eap-sim-rsa/hosts/carol/etc/ipsec.conf
new file mode 100755
index 000000000..c2fe02639
--- /dev/null
+++ b/testing/tests/ikev2/rw-eap-sim-rsa/hosts/carol/etc/ipsec.conf
@@ -0,0 +1,23 @@
+# /etc/ipsec.conf - strongSwan IPsec configuration file
+
+config setup
+ plutostart=no
+
+conn %default
+ ikelifetime=60m
+ keylife=20m
+ rekeymargin=3m
+ keyingtries=1
+ keyexchange=ikev2
+ authby=eap
+
+conn home
+ left=PH_IP_CAROL
+ leftnexthop=%direct
+ leftid=carol@strongswan.org
+ leftfirewall=yes
+ right=PH_IP_MOON
+ rightid=@moon.strongswan.org
+ rightsubnet=10.1.0.0/16
+ rightsendcert=never
+ auto=add
diff --git a/testing/tests/ikev2/rw-eap-sim-rsa/hosts/carol/etc/ipsec.d/triplets.dat b/testing/tests/ikev2/rw-eap-sim-rsa/hosts/carol/etc/ipsec.d/triplets.dat
new file mode 100644
index 000000000..759585439
--- /dev/null
+++ b/testing/tests/ikev2/rw-eap-sim-rsa/hosts/carol/etc/ipsec.d/triplets.dat
@@ -0,0 +1,3 @@
+moon.strongswan.org,100,210,310
+moon.strongswan.org,200,220,320
+moon.strongswan.org,300,230,330
diff --git a/testing/tests/ikev2/rw-eap-sim-rsa/hosts/moon/etc/ipsec.conf b/testing/tests/ikev2/rw-eap-sim-rsa/hosts/moon/etc/ipsec.conf
new file mode 100755
index 000000000..3f88b2ade
--- /dev/null
+++ b/testing/tests/ikev2/rw-eap-sim-rsa/hosts/moon/etc/ipsec.conf
@@ -0,0 +1,24 @@
+# /etc/ipsec.conf - strongSwan IPsec configuration file
+
+config setup
+ strictcrlpolicy=no
+ plutostart=no
+
+conn %default
+ ikelifetime=60m
+ keylife=20m
+ rekeymargin=3m
+ keyingtries=1
+ keyexchange=ikev2
+
+conn rw-eapsim
+ authby=rsasig
+ eap=sim
+ left=PH_IP_MOON
+ leftsubnet=10.1.0.0/16
+ leftid=@moon.strongswan.org
+ leftcert=moonCert.pem
+ leftfirewall=yes
+ rightid=*@strongswan.org
+ right=%any
+ auto=add
diff --git a/testing/tests/ikev2/rw-eap-sim-rsa/hosts/moon/etc/ipsec.d/triplets.dat b/testing/tests/ikev2/rw-eap-sim-rsa/hosts/moon/etc/ipsec.d/triplets.dat
new file mode 100644
index 000000000..b15a1dd72
--- /dev/null
+++ b/testing/tests/ikev2/rw-eap-sim-rsa/hosts/moon/etc/ipsec.d/triplets.dat
@@ -0,0 +1,3 @@
+carol@strongswan.org,100,210,310
+carol@strongswan.org,200,220,320
+carol@strongswan.org,300,230,330
diff --git a/testing/tests/ikev2/rw-eap-sim-rsa/posttest.dat b/testing/tests/ikev2/rw-eap-sim-rsa/posttest.dat
new file mode 100644
index 000000000..94a400606
--- /dev/null
+++ b/testing/tests/ikev2/rw-eap-sim-rsa/posttest.dat
@@ -0,0 +1,4 @@
+moon::ipsec stop
+carol::ipsec stop
+moon::/etc/init.d/iptables stop 2> /dev/null
+carol::/etc/init.d/iptables stop 2> /dev/null
diff --git a/testing/tests/ikev2/rw-eap-sim-rsa/pretest.dat b/testing/tests/ikev2/rw-eap-sim-rsa/pretest.dat
new file mode 100644
index 000000000..23c7a62b2
--- /dev/null
+++ b/testing/tests/ikev2/rw-eap-sim-rsa/pretest.dat
@@ -0,0 +1,9 @@
+moon::/etc/init.d/iptables start 2> /dev/null
+carol::/etc/init.d/iptables start 2> /dev/null
+moon::cat /etc/ipsec.d/triplets.dat
+carol::cat /etc/ipsec.d/triplets.dat
+moon::ipsec start
+carol::ipsec start
+carol::sleep 1
+carol::ipsec up home
+carol::sleep 1
diff --git a/testing/tests/ikev2/rw-eap-sim-rsa/test.conf b/testing/tests/ikev2/rw-eap-sim-rsa/test.conf
new file mode 100644
index 000000000..2bd21499b
--- /dev/null
+++ b/testing/tests/ikev2/rw-eap-sim-rsa/test.conf
@@ -0,0 +1,21 @@
+#!/bin/bash
+#
+# This configuration file provides information on the
+# UML instances used for this test
+
+# All UML instances that are required for this test
+#
+UMLHOSTS="alice carol moon"
+
+# Corresponding block diagram
+#
+DIAGRAM="a-m-c.png"
+
+# UML instances on which tcpdump is to be started
+#
+TCPDUMPHOSTS="moon"
+
+# UML instances on which IPsec is started
+# Used for IPsec logging purposes
+#
+IPSECHOSTS="moon carol"
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-07 07:17:12 +0000