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-rw-r--r--src/charon/plugins/eap_sim/eap_sim.c1149
1 files changed, 0 insertions, 1149 deletions
diff --git a/src/charon/plugins/eap_sim/eap_sim.c b/src/charon/plugins/eap_sim/eap_sim.c
deleted file mode 100644
index 2dd6e534b..000000000
--- a/src/charon/plugins/eap_sim/eap_sim.c
+++ /dev/null
@@ -1,1149 +0,0 @@
-/*
- * 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 "eap_sim.h"
-
-#include <dlfcn.h>
-
-#include <daemon.h>
-#include <library.h>
-
-#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",
- "SIM_NOTIFICATION",
- "SIM_13",
- "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",
- "AT_RAND",
- "AT_AUTN",
- "AT_RES",
- "AT_AUTS",
- "AT_5",
- "AT_PADDING",
- "AT_NONCE_MT",
- "AT_8",
- "AT_9",
- "AT_PERMANENT_ID_REQ",
- "AT_MAC",
- "AT_NOTIFICATION",
- "AT_ANY_ID_REQ",
- "AT_IDENTITY",
- "AT_VERSION_LIST",
- "AT_SELECTED_VERSION",
- "AT_FULLAUTH_ID_REQ",
- "AT_18",
- "AT_COUNTER",
- "AT_COUNTER_TOO_SMALL",
- "AT_NONCE_S",
- "AT_CLIENT_ERROR_CODE");
-ENUM_NEXT(sim_attribute_names, AT_IV, AT_RESULT_IND, AT_CLIENT_ERROR_CODE,
- "AT_IV",
- "AT_ENCR_DATA",
- "AT_131",
- "AT_NEXT_PSEUDONYM",
- "AT_NEXT_REAUTH_ID",
- "AT_CHECKCODE",
- "AT_RESULT_IND");
-ENUM_END(sim_attribute_names, AT_RESULT_IND);
-
-
-typedef struct private_eap_sim_t private_eap_sim_t;
-
-/**
- * Private data of an eap_sim_t object.
- */
-struct private_eap_sim_t {
-
- /**
- * Public authenticator_t interface.
- */
- eap_sim_t public;
-
- /**
- * ID of ourself
- */
- identification_t *peer;
-
- /**
- * hashing function
- */
- hasher_t *hasher;
-
- /**
- * prf
- */
- prf_t *prf;
-
- /**
- * MAC function
- */
- signer_t *signer;
-
- /**
- * how many times we try to authenticate
- */
- 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;
-
- /**
- * version list received from server
- */
- chunk_t version_list;
-
- /**
- * Nonce value used in AT_NONCE_MT
- */
- chunk_t nonce;
-
- /**
- * concatenated SRES values
- */
- chunk_t sreses;
-
- /**
- * k_encr key derived from MK
- */
- chunk_t k_encr;
-
- /**
- * k_auth key derived from MK, used for AT_MAC verification
- */
- chunk_t k_auth;
-
- /**
- * MSK, used for EAP-SIM based IKEv2 authentication
- */
- chunk_t msk;
-
- /**
- * EMSK, extended MSK for further uses
- */
- chunk_t emsk;
-};
-
-/** length of the AT_NONCE_MT nonce value */
-#define NONCE_LEN 16
-/** length of the AT_MAC value */
-#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 */
-#define KAUTH_LEN 16
-/** length of the MSK */
-#define MSK_LEN 64
-/** 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};
-char client_error_insufficient_buf[] = {0x00, 0x03};
-char client_error_notfresh_buf[] = {0x00, 0x04};
-chunk_t client_error_general = chunk_from_buf(client_error_general_buf);
-chunk_t client_error_unsupported = chunk_from_buf(client_error_unsupported_buf);
-chunk_t client_error_insufficient = chunk_from_buf(client_error_insufficient_buf);
-chunk_t client_error_notfresh = chunk_from_buf(client_error_notfresh_buf);
-
-/**
- * Read EAP and EAP-SIM header, return SIM type
- */
-static sim_subtype_t read_header(chunk_t *message)
-{
- sim_subtype_t type;
-
- if (message->len < 8)
- {
- *message = chunk_empty;
- return 0;
- }
- type = *(message->ptr + 5);
- *message = chunk_skip(*message, 8);
- return type;
-}
-
-/**
- * read the next attribute from the chunk data
- */
-static sim_attribute_t read_attribute(chunk_t *message, chunk_t *data)
-{
- sim_attribute_t attribute;
- size_t length;
-
- DBG3(DBG_IKE, "reading attribute from %B", message);
-
- if (message->len < 2)
- {
- return AT_END;
- }
- attribute = *message->ptr++;
- length = *message->ptr++ * 4 - 2;
- message->len -= 2;
- DBG3(DBG_IKE, "found attribute %N with length %d",
- sim_attribute_names, attribute, length);
-
- if (length > message->len)
- {
- return AT_END;
- }
- data->len = length;
- data->ptr = message->ptr;
- *message = chunk_skip(*message, length);
- return attribute;
-}
-
-/**
- * Build an EAP-SIM payload using a variable length attribute list.
- * The variable argument takes a sim_attribute_t followed by its data in a chunk.
- */
-static eap_payload_t *build_payload(private_eap_sim_t *this, u_int8_t identifier,
- sim_subtype_t type, ...)
-{
- chunk_t message = chunk_alloca(512);
- chunk_t pos = message;
- eap_payload_t *payload;
- va_list args;
- sim_attribute_t attr;
- u_int8_t *mac_pos = NULL;
- chunk_t mac_data = chunk_empty;
-
- /* write EAP header, skip length bytes */
- *pos.ptr++ = this->type;
- *pos.ptr++ = identifier;
- pos.ptr += 2;
- pos.len -= 4;
- /* write SIM header with type and subtype, zero reserved bytes */
- *pos.ptr++ = EAP_SIM;
- *pos.ptr++ = type;
- *pos.ptr++ = 0;
- *pos.ptr++ = 0;
- pos.len -= 4;
-
- va_start(args, type);
- while ((attr = va_arg(args, sim_attribute_t)) != AT_END)
- {
- chunk_t data = va_arg(args, chunk_t);
-
- DBG3(DBG_IKE, "building %N %B", sim_attribute_names, attr, &data);
-
- /* write attribute header */
- *pos.ptr++ = attr;
- pos.len--;
-
- switch (attr)
- {
- case AT_CLIENT_ERROR_CODE:
- case AT_SELECTED_VERSION:
- {
- *pos.ptr = data.len/4 + 1;
- pos = chunk_skip(pos, 1);
- memcpy(pos.ptr, data.ptr, data.len);
- pos = chunk_skip(pos, data.len);
- break;
- }
- case AT_IDENTITY:
- case AT_VERSION_LIST:
- {
- u_int16_t act_len = data.len;
- /* align up to four byte */
- if (data.len % 4)
- {
- chunk_t tmp = chunk_alloca((data.len/4)*4 + 4);
- memset(tmp.ptr, 0, tmp.len);
- memcpy(tmp.ptr, data.ptr, data.len);
- data = tmp;
- }
- *pos.ptr = data.len/4 + 1;
- pos = chunk_skip(pos, 1);
- /* actual length in bytes */
- *(u_int16_t*)pos.ptr = htons(act_len);
- pos = chunk_skip(pos, sizeof(u_int16_t));
- memcpy(pos.ptr, data.ptr, data.len);
- pos = chunk_skip(pos, data.len);
- break;
- }
- case AT_NONCE_MT:
- {
- *pos.ptr = data.len/4 + 1;
- pos = chunk_skip(pos, 1);
- memset(pos.ptr, 0, 2);
- pos = chunk_skip(pos, 2);
- memcpy(pos.ptr, data.ptr, data.len);
- pos = chunk_skip(pos, data.len);
- break;
- }
- case AT_MAC:
- {
- *pos.ptr++ = 5; pos.len--;
- *pos.ptr++ = 0; pos.len--;
- *pos.ptr++ = 0; pos.len--;
- mac_pos = pos.ptr;
- memset(mac_pos, 0, MAC_LEN);
- pos = chunk_skip(pos, MAC_LEN);
- mac_data = data;
- break;
- }
- case AT_RAND:
- {
- *pos.ptr++ = data.len/4 + 1; pos.len--;
- *pos.ptr++ = 0; pos.len--;
- *pos.ptr++ = 0; pos.len--;
- memcpy(pos.ptr, data.ptr, data.len);
- pos = chunk_skip(pos, data.len);
- break;
- }
- default:
- DBG1(DBG_IKE, "no rule to build EAP_SIM attribute %N, skipped",
- sim_attribute_names, attr);
- break;
- }
- }
- va_end(args);
-
- /* calculate message length, write into header */
- message.len = pos.ptr - message.ptr;
- *(u_int16_t*)(message.ptr + 2) = htons(message.len);
-
- /* create MAC if AT_MAC attribte was included. Append supplied va_arg
- * chunk mac_data to "to-sign" chunk */
- if (mac_pos)
- {
- this->signer->set_key(this->signer, this->k_auth);
- mac_data = chunk_cata("cc", message, mac_data);
- this->signer->get_signature(this->signer, mac_data, mac_pos);
- DBG3(DBG_IKE, "AT_MAC signature of %B\n is %b",
- &mac_data, mac_pos, MAC_LEN);
- }
-
- payload = eap_payload_create_data(message);
-
- DBG3(DBG_IKE, "created EAP message %B", &message);
- return payload;
-}
-
-/**
- * process an EAP-SIM/Request/Start message
- */
-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;
- u_int8_t identifier;
-
- identifier = in->get_identifier(in);
- message = in->get_data(in);
- read_header(&message);
-
- while ((attribute = read_attribute(&message, &data)) != AT_END)
- {
- switch (attribute)
- {
- case AT_VERSION_LIST:
- {
- /* check if server supports our implementation */
- bool found = FALSE;
- if (data.len > 2)
- {
- /* read actual length first */
- data.len = min(data.len, ntohs(*(u_int16_t*)data.ptr) + 2);
- data = chunk_skip(data, 2);
- chunk_free(&this->version_list);
- this->version_list = chunk_clone(data);
- while (data.len >= this->version.len)
- {
- if (memeq(data.ptr, this->version.ptr, this->version.len))
- {
- found = TRUE;
- break;
- }
- data = chunk_skip(data, this->version.len);
- }
- }
- if (!found)
- {
- DBG1(DBG_IKE, "server does not support EAP_SIM "
- "version number %#B", &this->version);
- *out = build_payload(this, identifier, SIM_CLIENT_ERROR,
- AT_CLIENT_ERROR_CODE, client_error_unsupported,
- AT_END);
- return NEED_MORE;
- }
- break;
- }
- case AT_PERMANENT_ID_REQ:
- case AT_FULLAUTH_ID_REQ:
- case AT_ANY_ID_REQ:
- /* only include AT_IDENTITY if requested */
- include_id = AT_IDENTITY;
- break;
- case AT_NOTIFICATION:
- {
- u_int16_t code = 0;
- if (data.len == 2)
- {
- code = ntohs(*(u_int16_t*)data.ptr);
- }
- if (code <= 32767) /* no success bit */
- {
- DBG1(DBG_IKE, "received %N error %d",
- sim_attribute_names, attribute, code);
- *out = build_payload(this,
- in->get_identifier(in), SIM_CLIENT_ERROR,
- AT_CLIENT_ERROR_CODE, client_error_general,
- AT_END);
- return NEED_MORE;
- }
- else
- {
- DBG1(DBG_IKE, "received %N code %d",
- sim_attribute_names, attribute, code);
- }
- break;
- }
- default:
- DBG1(DBG_IKE, "ignoring EAP_SIM attribute %N",
- sim_attribute_names, attribute);
- break;
- }
- }
-
- /* build payload. If "include_id" is AT_END, AT_IDENTITY is ommited */
- *out = build_payload(this, identifier, SIM_START,
- AT_SELECTED_VERSION, this->version,
- AT_NONCE_MT, this->nonce,
- include_id, this->peer->get_encoding(this->peer),
- AT_END);
- return NEED_MORE;
-}
-
-/**
- * derive EAP keys from kc
- */
-static void derive_keys(private_eap_sim_t *this, chunk_t kcs)
-{
- chunk_t tmp, mk;
- 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);
- mk = chunk_alloca(this->hasher->get_hash_size(this->hasher));
- this->hasher->get_hash(this->hasher, tmp, mk.ptr);
- 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 */
- this->prf->set_key(this->prf, mk);
- tmp = chunk_alloca(this->prf->get_block_size(this->prf) * 4);
- for (i = 0; i < 4; i++)
- {
- this->prf->get_bytes(this->prf, chunk_empty, tmp.ptr + tmp.len / 4 * i);
- }
- 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);
-}
-
-/**
- * Read a triplet from the SIM card
- */
-static bool get_card_triplet(private_eap_sim_t *this,
- char *rand, char *sres, char *kc)
-{
- enumerator_t *enumerator;
- sim_card_t *card = NULL, *current;
- id_match_t match, best = ID_MATCH_NONE;
- bool success = FALSE;
-
- /* find the best matching SIM */
- enumerator = charon->sim->create_card_enumerator(charon->sim);
- while (enumerator->enumerate(enumerator, &current))
- {
- match = this->peer->matches(this->peer, current->get_imsi(current));
- if (match > best)
- {
- card = current;
- best = match;
- break;
- }
- }
- if (card)
- {
- success = card->get_triplet(card, rand, sres, kc);
- }
- enumerator->destroy(enumerator);
- if (!card)
- {
- DBG1(DBG_IKE, "no SIM card found matching '%Y'", this->peer);
- }
- return success;
-}
-
-/**
- * process an EAP-SIM/Request/Challenge message
- */
-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;
- sim_attribute_t attribute;
- u_int8_t identifier;
- chunk_t mac = chunk_empty, rands = chunk_empty;
-
- if (this->tries-- <= 0)
- {
- /* give up without notification. This hack is required as some buggy
- * server implementations won't respect our client-error. */
- return FAILED;
- }
-
- identifier = in->get_identifier(in);
- message = in->get_data(in);
- read_header(&message);
-
- while ((attribute = read_attribute(&message, &data)) != AT_END)
- {
- switch (attribute)
- {
- case AT_RAND:
- {
- rands = chunk_skip(data, 2);
- break;
- }
- case AT_MAC:
- {
- /* backup MAC, zero it inline for later verification */
- data = chunk_skip(data, 2);
- mac = chunk_clonea(data);
- memset(data.ptr, 0, data.len);
- break;
- }
- case AT_NOTIFICATION:
- {
- u_int16_t code = 0;
- if (data.len == 2)
- {
- code = ntohs(*(u_int16_t*)data.ptr);
- }
- if (code <= 32767) /* no success bit */
- {
- DBG1(DBG_IKE, "received %N error %d",
- sim_attribute_names, attribute, code);
- *out = build_payload(this,
- in->get_identifier(in), SIM_CLIENT_ERROR,
- AT_CLIENT_ERROR_CODE, client_error_general,
- AT_END);
- return NEED_MORE;
- }
- else
- {
- DBG1(DBG_IKE, "received %N code %d",
- sim_attribute_names, attribute, code);
- }
- break;
- }
- default:
- DBG1(DBG_IKE, "ignoring EAP_SIM attribute %N",
- sim_attribute_names, attribute);
- break;
- }
- }
-
- /* excepting two or three RAND, each 16 bytes. We require two valid
- * and different RANDs */
- if ((rands.len != 2 * RAND_LEN && rands.len != 3 * RAND_LEN) ||
- memeq(rands.ptr, rands.ptr + RAND_LEN, RAND_LEN))
- {
- DBG1(DBG_IKE, "no valid AT_RAND received");
- *out = build_payload(this, identifier, SIM_CLIENT_ERROR,
- AT_CLIENT_ERROR_CODE, client_error_insufficient,
- AT_END);
- return NEED_MORE;
- }
- if (mac.len != MAC_LEN)
- {
- DBG1(DBG_IKE, "no valid AT_MAC received");
- *out = build_payload(this, identifier, SIM_CLIENT_ERROR,
- AT_CLIENT_ERROR_CODE, client_error_general,
- AT_END);
- return NEED_MORE;
- }
-
- /* get two or three KCs/SRESes from SIM using RANDs */
- kcs = kc = chunk_alloca(rands.len / 2);
- sreses = sres = chunk_alloca(rands.len / 4);
- while (rands.len >= RAND_LEN)
- {
- if (!get_card_triplet(this, rands.ptr, sres.ptr, kc.ptr))
- {
- 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);
- return NEED_MORE;
- }
- DBG3(DBG_IKE, "got triplet for RAND %b\n Kc %b\n SRES %b",
- rands.ptr, RAND_LEN, sres.ptr, SRES_LEN, kc.ptr, KC_LEN);
- kc = chunk_skip(kc, KC_LEN);
- sres = chunk_skip(sres, SRES_LEN);
- rands = chunk_skip(rands, RAND_LEN);
- }
-
- derive_keys(this, kcs);
-
- /* verify AT_MAC attribute, signature is over "EAP packet | NONCE_MT" */
- this->signer->set_key(this->signer, this->k_auth);
- tmp = chunk_cata("cc", in->get_data(in), this->nonce);
- if (!this->signer->verify_signature(this->signer, tmp, mac))
- {
- DBG1(DBG_IKE, "AT_MAC verification failed");
- *out = build_payload(this, identifier, SIM_CLIENT_ERROR,
- AT_CLIENT_ERROR_CODE, client_error_general,
- AT_END);
- return NEED_MORE;
- }
-
- /* build response, AT_MAC is built over "EAP packet | n*SRES" */
- *out = build_payload(this, identifier, SIM_CHALLENGE,
- AT_MAC, sreses,
- AT_END);
- return NEED_MORE;
-}
-
-/**
- * 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;
-
- 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" */
- this->signer->set_key(this->signer, this->k_auth);
- tmp = chunk_cata("cc", in->get_data(in), this->sreses);
- if (!this->signer->verify_signature(this->signer, tmp, mac))
- {
- DBG1(DBG_IKE, "AT_MAC verification failed");
- return FAILED;
- }
- return SUCCESS;
-}
-
-/**
- * Fetch a triplet from a provider
- */
-static bool get_provider_triplet(private_eap_sim_t *this,
- char *rand, char *sres, char *kc)
-{
- enumerator_t *enumerator;
- sim_provider_t *provider;
- int tried = 0;
-
- enumerator = charon->sim->create_provider_enumerator(charon->sim);
- while (enumerator->enumerate(enumerator, &provider))
- {
- if (provider->get_triplet(provider, this->peer, rand, sres, kc))
- {
- enumerator->destroy(enumerator);
- return TRUE;
- }
- tried++;
- }
- enumerator->destroy(enumerator);
- DBG1(DBG_IKE, "tried %d SIM providers, but none had a triplet for '%Y'",
- tried, this->peer);
- return FALSE;
-}
-
-/**
- * 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;
- int i;
-
- 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;
- }
-
- /* 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++)
- {
- if (!get_provider_triplet(this, rand.ptr, sres.ptr, kc.ptr))
- {
- DBG1(DBG_IKE, "getting EAP-SIM triplet %d failed", i);
- return FAILED;
- }
- rands.len += RAND_LEN;
- sreses.len += SRES_LEN;
- kcs.len += KC_LEN;
- rand = chunk_skip(rand, RAND_LEN);
- sres = chunk_skip(sres, SRES_LEN);
- kc = chunk_skip(kc, KC_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 peer_process_notification(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)
- {
- switch (attribute)
- {
- case AT_NOTIFICATION:
- {
- u_int16_t code = 0;
- if (data.len == 2)
- {
- code = ntohs(*(u_int16_t*)data.ptr);
- }
- if (code <= 32767) /* no success bit */
- {
- DBG1(DBG_IKE, "received %N error %d",
- sim_attribute_names, attribute, code);
- *out = build_payload(this,
- in->get_identifier(in), SIM_CLIENT_ERROR,
- AT_CLIENT_ERROR_CODE, client_error_general,
- AT_END);
- return NEED_MORE;
- }
- else
- {
- DBG1(DBG_IKE, "received %N code %d",
- sim_attribute_names, attribute, code);
- }
- break;
- }
- default:
- DBG1(DBG_IKE, "ignoring EAP_SIM attribute %N",
- sim_attribute_names, attribute);
- break;
- }
- }
- /* reply with empty notification */
- *out = build_payload(this, in->get_identifier(in), SIM_NOTIFICATION, AT_END);
- 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 peer_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 peer_process_start(this, in, out);
- case SIM_CHALLENGE:
- return peer_process_challenge(this, in, out);
- case SIM_NOTIFICATION:
- return peer_process_notification(this, in, out);
- default:
- DBG1(DBG_IKE, "unable to process EAP_SIM subtype %N",
- sim_subtype_names, type);
- *out = build_payload(this, in->get_identifier(in), SIM_CLIENT_ERROR,
- AT_CLIENT_ERROR_CODE, client_error_general, AT_END);
- return NEED_MORE;
- }
-}
-
-/**
- * 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 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)
-{
- *vendor = 0;
- return EAP_SIM;
-}
-
-/**
- * Implementation of eap_method_t.get_msk.
- */
-static status_t get_msk(private_eap_sim_t *this, chunk_t *msk)
-{
- if (this->msk.ptr)
- {
- *msk = this->msk;
- return SUCCESS;
- }
- return FAILED;
-}
-
-/**
- * Implementation of eap_method_t.is_mutual.
- */
-static bool is_mutual(private_eap_sim_t *this)
-{
- return TRUE;
-}
-
-/**
- * Implementation of eap_method_t.destroy.
- */
-static void destroy(private_eap_sim_t *this)
-{
- this->peer->destroy(this->peer);
- DESTROY_IF(this->hasher);
- DESTROY_IF(this->prf);
- DESTROY_IF(this->signer);
- chunk_free(&this->nonce);
- chunk_free(&this->sreses);
- chunk_free(&this->version_list);
- chunk_free(&this->k_auth);
- chunk_free(&this->k_encr);
- chunk_free(&this->msk);
- chunk_free(&this->emsk);
- free(this);
-}
-
-/**
- * Generic constructor for both roles
- */
-eap_sim_t *eap_sim_create_generic(eap_role_t role, identification_t *server,
- identification_t *peer)
-{
- private_eap_sim_t *this = malloc_thing(private_eap_sim_t);
- rng_t *rng;
-
- this->nonce = chunk_empty;
- this->sreses = chunk_empty;
- this->peer = peer->clone(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;
- /* generate a non-zero identifier */
- do {
- this->identifier = random();
- } while (!this->identifier);
-
- switch (role)
- {
- 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->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->type = EAP_RESPONSE;
- rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK);
- if (!rng)
- {
- DBG1(DBG_IKE, "unable to generate NONCE for EAP_SIM");
- free(this);
- return NULL;
- }
- rng->allocate_bytes(rng, NONCE_LEN, &this->nonce);
- rng->destroy(rng);
- break;
- default:
- free(this);
- return NULL;
- }
- 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;
-
- this->hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
- this->prf = lib->crypto->create_prf(lib->crypto, PRF_FIPS_SHA1_160);
- this->signer = lib->crypto->create_signer(lib->crypto, AUTH_HMAC_SHA1_128);
- if (!this->hasher || !this->prf || !this->signer)
- {
- DBG1(DBG_IKE, "initiating EAP-SIM failed, FIPS-PRF/SHA1 not supported");
- destroy(this);
- return NULL;
- }
- return &this->public;
-}
-
-/*
- * Described in header.
- */
-eap_sim_t *eap_sim_create_server(identification_t *server,
- identification_t *peer)
-{
- return eap_sim_create_generic(EAP_SERVER, server, peer);
-}
-
-/*
- * Described in header.
- */
-eap_sim_t *eap_sim_create_peer(identification_t *server,
- identification_t *peer)
-{
- return eap_sim_create_generic(EAP_PEER, server, peer);
-}
-
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 22:22:32 +0000