+++ /dev/null
-/*
- * hostapd / EAP-SIM database/authenticator gateway
- * Copyright (c) 2005-2007, Jouni Malinen <j@w1.fi>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Alternatively, this software may be distributed under the terms of BSD
- * license.
- *
- * See README and COPYING for more details.
- *
- * This is an example implementation of the EAP-SIM/AKA database/authentication
- * gateway interface that is using an external program as an SS7 gateway to
- * GSM/UMTS authentication center (HLR/AuC). hlr_auc_gw is an example
- * implementation of such a gateway program. This eap_sim_db.c takes care of
- * EAP-SIM/AKA pseudonyms and re-auth identities. It can be used with different
- * gateway implementations for HLR/AuC access. Alternatively, it can also be
- * completely replaced if the in-memory database of pseudonyms/re-auth
- * identities is not suitable for some cases.
- */
-
-#include "includes.h"
-#include <sys/un.h>
-
-#include "common.h"
-#include "eap_common/eap_sim_common.h"
-#include "eap_server/eap_sim_db.h"
-#include "eloop.h"
-
-struct eap_sim_pseudonym {
- struct eap_sim_pseudonym *next;
- u8 *identity;
- size_t identity_len;
- char *pseudonym;
-};
-
-struct eap_sim_db_pending {
- struct eap_sim_db_pending *next;
- u8 imsi[20];
- size_t imsi_len;
- enum { PENDING, SUCCESS, FAILURE } state;
- void *cb_session_ctx;
- struct os_time timestamp;
- int aka;
- union {
- struct {
- u8 kc[EAP_SIM_MAX_CHAL][EAP_SIM_KC_LEN];
- u8 sres[EAP_SIM_MAX_CHAL][EAP_SIM_SRES_LEN];
- u8 rand[EAP_SIM_MAX_CHAL][GSM_RAND_LEN];
- int num_chal;
- } sim;
- struct {
- u8 rand[EAP_AKA_RAND_LEN];
- u8 autn[EAP_AKA_AUTN_LEN];
- u8 ik[EAP_AKA_IK_LEN];
- u8 ck[EAP_AKA_CK_LEN];
- u8 res[EAP_AKA_RES_MAX_LEN];
- size_t res_len;
- } aka;
- } u;
-};
-
-struct eap_sim_db_data {
- int sock;
- char *fname;
- char *local_sock;
- void (*get_complete_cb)(void *ctx, void *session_ctx);
- void *ctx;
- struct eap_sim_pseudonym *pseudonyms;
- struct eap_sim_reauth *reauths;
- struct eap_sim_db_pending *pending;
-};
-
-
-static struct eap_sim_db_pending *
-eap_sim_db_get_pending(struct eap_sim_db_data *data, const u8 *imsi,
- size_t imsi_len, int aka)
-{
- struct eap_sim_db_pending *entry, *prev = NULL;
-
- entry = data->pending;
- while (entry) {
- if (entry->aka == aka && entry->imsi_len == imsi_len &&
- os_memcmp(entry->imsi, imsi, imsi_len) == 0) {
- if (prev)
- prev->next = entry->next;
- else
- data->pending = entry->next;
- break;
- }
- prev = entry;
- entry = entry->next;
- }
- return entry;
-}
-
-
-static void eap_sim_db_add_pending(struct eap_sim_db_data *data,
- struct eap_sim_db_pending *entry)
-{
- entry->next = data->pending;
- data->pending = entry;
-}
-
-
-static void eap_sim_db_sim_resp_auth(struct eap_sim_db_data *data,
- const char *imsi, char *buf)
-{
- char *start, *end, *pos;
- struct eap_sim_db_pending *entry;
- int num_chal;
-
- /*
- * SIM-RESP-AUTH <IMSI> Kc(i):SRES(i):RAND(i) ...
- * SIM-RESP-AUTH <IMSI> FAILURE
- * (IMSI = ASCII string, Kc/SRES/RAND = hex string)
- */
-
- entry = eap_sim_db_get_pending(data, (u8 *) imsi, os_strlen(imsi), 0);
- if (entry == NULL) {
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: No pending entry for the "
- "received message found");
- return;
- }
-
- start = buf;
- if (os_strncmp(start, "FAILURE", 7) == 0) {
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: External server reported "
- "failure");
- entry->state = FAILURE;
- eap_sim_db_add_pending(data, entry);
- data->get_complete_cb(data->ctx, entry->cb_session_ctx);
- return;
- }
-
- num_chal = 0;
- while (num_chal < EAP_SIM_MAX_CHAL) {
- end = os_strchr(start, ' ');
- if (end)
- *end = '\0';
-
- pos = os_strchr(start, ':');
- if (pos == NULL)
- goto parse_fail;
- *pos = '\0';
- if (hexstr2bin(start, entry->u.sim.kc[num_chal],
- EAP_SIM_KC_LEN))
- goto parse_fail;
-
- start = pos + 1;
- pos = os_strchr(start, ':');
- if (pos == NULL)
- goto parse_fail;
- *pos = '\0';
- if (hexstr2bin(start, entry->u.sim.sres[num_chal],
- EAP_SIM_SRES_LEN))
- goto parse_fail;
-
- start = pos + 1;
- if (hexstr2bin(start, entry->u.sim.rand[num_chal],
- GSM_RAND_LEN))
- goto parse_fail;
-
- num_chal++;
- if (end == NULL)
- break;
- else
- start = end + 1;
- }
- entry->u.sim.num_chal = num_chal;
-
- entry->state = SUCCESS;
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: Authentication data parsed "
- "successfully - callback");
- eap_sim_db_add_pending(data, entry);
- data->get_complete_cb(data->ctx, entry->cb_session_ctx);
- return;
-
-parse_fail:
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: Failed to parse response string");
- os_free(entry);
-}
-
-
-static void eap_sim_db_aka_resp_auth(struct eap_sim_db_data *data,
- const char *imsi, char *buf)
-{
- char *start, *end;
- struct eap_sim_db_pending *entry;
-
- /*
- * AKA-RESP-AUTH <IMSI> <RAND> <AUTN> <IK> <CK> <RES>
- * AKA-RESP-AUTH <IMSI> FAILURE
- * (IMSI = ASCII string, RAND/AUTN/IK/CK/RES = hex string)
- */
-
- entry = eap_sim_db_get_pending(data, (u8 *) imsi, os_strlen(imsi), 1);
- if (entry == NULL) {
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: No pending entry for the "
- "received message found");
- return;
- }
-
- start = buf;
- if (os_strncmp(start, "FAILURE", 7) == 0) {
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: External server reported "
- "failure");
- entry->state = FAILURE;
- eap_sim_db_add_pending(data, entry);
- data->get_complete_cb(data->ctx, entry->cb_session_ctx);
- return;
- }
-
- end = os_strchr(start, ' ');
- if (end == NULL)
- goto parse_fail;
- *end = '\0';
- if (hexstr2bin(start, entry->u.aka.rand, EAP_AKA_RAND_LEN))
- goto parse_fail;
-
- start = end + 1;
- end = os_strchr(start, ' ');
- if (end == NULL)
- goto parse_fail;
- *end = '\0';
- if (hexstr2bin(start, entry->u.aka.autn, EAP_AKA_AUTN_LEN))
- goto parse_fail;
-
- start = end + 1;
- end = os_strchr(start, ' ');
- if (end == NULL)
- goto parse_fail;
- *end = '\0';
- if (hexstr2bin(start, entry->u.aka.ik, EAP_AKA_IK_LEN))
- goto parse_fail;
-
- start = end + 1;
- end = os_strchr(start, ' ');
- if (end == NULL)
- goto parse_fail;
- *end = '\0';
- if (hexstr2bin(start, entry->u.aka.ck, EAP_AKA_CK_LEN))
- goto parse_fail;
-
- start = end + 1;
- end = os_strchr(start, ' ');
- if (end)
- *end = '\0';
- else {
- end = start;
- while (*end)
- end++;
- }
- entry->u.aka.res_len = (end - start) / 2;
- if (entry->u.aka.res_len > EAP_AKA_RES_MAX_LEN) {
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: Too long RES");
- entry->u.aka.res_len = 0;
- goto parse_fail;
- }
- if (hexstr2bin(start, entry->u.aka.res, entry->u.aka.res_len))
- goto parse_fail;
-
- entry->state = SUCCESS;
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: Authentication data parsed "
- "successfully - callback");
- eap_sim_db_add_pending(data, entry);
- data->get_complete_cb(data->ctx, entry->cb_session_ctx);
- return;
-
-parse_fail:
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: Failed to parse response string");
- os_free(entry);
-}
-
-
-static void eap_sim_db_receive(int sock, void *eloop_ctx, void *sock_ctx)
-{
- struct eap_sim_db_data *data = eloop_ctx;
- char buf[1000], *pos, *cmd, *imsi;
- int res;
-
- res = recv(sock, buf, sizeof(buf), 0);
- if (res < 0)
- return;
- wpa_hexdump_ascii_key(MSG_MSGDUMP, "EAP-SIM DB: Received from an "
- "external source", (u8 *) buf, res);
- if (res == 0)
- return;
- if (res >= (int) sizeof(buf))
- res = sizeof(buf) - 1;
- buf[res] = '\0';
-
- if (data->get_complete_cb == NULL) {
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: No get_complete_cb "
- "registered");
- return;
- }
-
- /* <cmd> <IMSI> ... */
-
- cmd = buf;
- pos = os_strchr(cmd, ' ');
- if (pos == NULL)
- goto parse_fail;
- *pos = '\0';
- imsi = pos + 1;
- pos = os_strchr(imsi, ' ');
- if (pos == NULL)
- goto parse_fail;
- *pos = '\0';
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: External response=%s for IMSI %s",
- cmd, imsi);
-
- if (os_strcmp(cmd, "SIM-RESP-AUTH") == 0)
- eap_sim_db_sim_resp_auth(data, imsi, pos + 1);
- else if (os_strcmp(cmd, "AKA-RESP-AUTH") == 0)
- eap_sim_db_aka_resp_auth(data, imsi, pos + 1);
- else
- wpa_printf(MSG_INFO, "EAP-SIM DB: Unknown external response "
- "'%s'", cmd);
- return;
-
-parse_fail:
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: Failed to parse response string");
-}
-
-
-static int eap_sim_db_open_socket(struct eap_sim_db_data *data)
-{
- struct sockaddr_un addr;
- static int counter = 0;
-
- if (os_strncmp(data->fname, "unix:", 5) != 0)
- return -1;
-
- data->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
- if (data->sock < 0) {
- perror("socket(eap_sim_db)");
- return -1;
- }
-
- os_memset(&addr, 0, sizeof(addr));
- addr.sun_family = AF_UNIX;
- os_snprintf(addr.sun_path, sizeof(addr.sun_path),
- "/tmp/eap_sim_db_%d-%d", getpid(), counter++);
- data->local_sock = os_strdup(addr.sun_path);
- if (bind(data->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
- perror("bind(eap_sim_db)");
- close(data->sock);
- data->sock = -1;
- return -1;
- }
-
- os_memset(&addr, 0, sizeof(addr));
- addr.sun_family = AF_UNIX;
- os_strlcpy(addr.sun_path, data->fname + 5, sizeof(addr.sun_path));
- if (connect(data->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
- perror("connect(eap_sim_db)");
- wpa_hexdump_ascii(MSG_INFO, "HLR/AuC GW socket",
- (u8 *) addr.sun_path,
- os_strlen(addr.sun_path));
- close(data->sock);
- data->sock = -1;
- return -1;
- }
-
- eloop_register_read_sock(data->sock, eap_sim_db_receive, data, NULL);
-
- return 0;
-}
-
-
-static void eap_sim_db_close_socket(struct eap_sim_db_data *data)
-{
- if (data->sock >= 0) {
- eloop_unregister_read_sock(data->sock);
- close(data->sock);
- data->sock = -1;
- }
- if (data->local_sock) {
- unlink(data->local_sock);
- os_free(data->local_sock);
- data->local_sock = NULL;
- }
-}
-
-
-/**
- * eap_sim_db_init - Initialize EAP-SIM DB / authentication gateway interface
- * @config: Configuration data (e.g., file name)
- * @get_complete_cb: Callback function for reporting availability of triplets
- * @ctx: Context pointer for get_complete_cb
- * Returns: Pointer to a private data structure or %NULL on failure
- */
-void * eap_sim_db_init(const char *config,
- void (*get_complete_cb)(void *ctx, void *session_ctx),
- void *ctx)
-{
- struct eap_sim_db_data *data;
-
- data = os_zalloc(sizeof(*data));
- if (data == NULL)
- return NULL;
-
- data->sock = -1;
- data->get_complete_cb = get_complete_cb;
- data->ctx = ctx;
- data->fname = os_strdup(config);
- if (data->fname == NULL)
- goto fail;
-
- if (os_strncmp(data->fname, "unix:", 5) == 0) {
- if (eap_sim_db_open_socket(data))
- goto fail;
- }
-
- return data;
-
-fail:
- eap_sim_db_close_socket(data);
- os_free(data->fname);
- os_free(data);
- return NULL;
-}
-
-
-static void eap_sim_db_free_pseudonym(struct eap_sim_pseudonym *p)
-{
- os_free(p->identity);
- os_free(p->pseudonym);
- os_free(p);
-}
-
-
-static void eap_sim_db_free_reauth(struct eap_sim_reauth *r)
-{
- os_free(r->identity);
- os_free(r->reauth_id);
- os_free(r);
-}
-
-
-/**
- * eap_sim_db_deinit - Deinitialize EAP-SIM DB/authentication gw interface
- * @priv: Private data pointer from eap_sim_db_init()
- */
-void eap_sim_db_deinit(void *priv)
-{
- struct eap_sim_db_data *data = priv;
- struct eap_sim_pseudonym *p, *prev;
- struct eap_sim_reauth *r, *prevr;
- struct eap_sim_db_pending *pending, *prev_pending;
-
- eap_sim_db_close_socket(data);
- os_free(data->fname);
-
- p = data->pseudonyms;
- while (p) {
- prev = p;
- p = p->next;
- eap_sim_db_free_pseudonym(prev);
- }
-
- r = data->reauths;
- while (r) {
- prevr = r;
- r = r->next;
- eap_sim_db_free_reauth(prevr);
- }
-
- pending = data->pending;
- while (pending) {
- prev_pending = pending;
- pending = pending->next;
- os_free(prev_pending);
- }
-
- os_free(data);
-}
-
-
-static int eap_sim_db_send(struct eap_sim_db_data *data, const char *msg,
- size_t len)
-{
- int _errno = 0;
-
- if (send(data->sock, msg, len, 0) < 0) {
- _errno = errno;
- perror("send[EAP-SIM DB UNIX]");
- }
-
- if (_errno == ENOTCONN || _errno == EDESTADDRREQ || _errno == EINVAL ||
- _errno == ECONNREFUSED) {
- /* Try to reconnect */
- eap_sim_db_close_socket(data);
- if (eap_sim_db_open_socket(data) < 0)
- return -1;
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: Reconnected to the "
- "external server");
- if (send(data->sock, msg, len, 0) < 0) {
- perror("send[EAP-SIM DB UNIX]");
- return -1;
- }
- }
-
- return 0;
-}
-
-
-static void eap_sim_db_expire_pending(struct eap_sim_db_data *data)
-{
- /* TODO: add limit for maximum length for pending list; remove latest
- * (i.e., last) entry from the list if the limit is reached; could also
- * use timeout to expire pending entries */
-}
-
-
-/**
- * eap_sim_db_get_gsm_triplets - Get GSM triplets
- * @priv: Private data pointer from eap_sim_db_init()
- * @identity: User name identity
- * @identity_len: Length of identity in bytes
- * @max_chal: Maximum number of triplets
- * @_rand: Buffer for RAND values
- * @kc: Buffer for Kc values
- * @sres: Buffer for SRES values
- * @cb_session_ctx: Session callback context for get_complete_cb()
- * Returns: Number of triplets received (has to be less than or equal to
- * max_chal), -1 (EAP_SIM_DB_FAILURE) on error (e.g., user not found), or
- * -2 (EAP_SIM_DB_PENDING) if results are not yet available. In this case, the
- * callback function registered with eap_sim_db_init() will be called once the
- * results become available.
- *
- * In most cases, the user name is '1' | IMSI, i.e., 1 followed by the IMSI in
- * ASCII format.
- *
- * When using an external server for GSM triplets, this function can always
- * start a request and return EAP_SIM_DB_PENDING immediately if authentication
- * triplets are not available. Once the triplets are received, callback
- * function registered with eap_sim_db_init() is called to notify EAP state
- * machine to reprocess the message. This eap_sim_db_get_gsm_triplets()
- * function will then be called again and the newly received triplets will then
- * be given to the caller.
- */
-int eap_sim_db_get_gsm_triplets(void *priv, const u8 *identity,
- size_t identity_len, int max_chal,
- u8 *_rand, u8 *kc, u8 *sres,
- void *cb_session_ctx)
-{
- struct eap_sim_db_data *data = priv;
- struct eap_sim_db_pending *entry;
- int len, ret;
- size_t i;
- char msg[40];
-
- if (identity_len < 2 || identity[0] != EAP_SIM_PERMANENT_PREFIX) {
- wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM DB: unexpected identity",
- identity, identity_len);
- return EAP_SIM_DB_FAILURE;
- }
- identity++;
- identity_len--;
- for (i = 0; i < identity_len; i++) {
- if (identity[i] == '@') {
- identity_len = i;
- break;
- }
- }
- if (identity_len + 1 > sizeof(entry->imsi)) {
- wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM DB: unexpected identity",
- identity, identity_len);
- return EAP_SIM_DB_FAILURE;
- }
- wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM DB: Get GSM triplets for IMSI",
- identity, identity_len);
-
- entry = eap_sim_db_get_pending(data, identity, identity_len, 0);
- if (entry) {
- int num_chal;
- if (entry->state == FAILURE) {
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: Pending entry -> "
- "failure");
- os_free(entry);
- return EAP_SIM_DB_FAILURE;
- }
-
- if (entry->state == PENDING) {
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: Pending entry -> "
- "still pending");
- eap_sim_db_add_pending(data, entry);
- return EAP_SIM_DB_PENDING;
- }
-
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: Pending entry -> "
- "%d challenges", entry->u.sim.num_chal);
- num_chal = entry->u.sim.num_chal;
- if (num_chal > max_chal)
- num_chal = max_chal;
- os_memcpy(_rand, entry->u.sim.rand, num_chal * GSM_RAND_LEN);
- os_memcpy(sres, entry->u.sim.sres,
- num_chal * EAP_SIM_SRES_LEN);
- os_memcpy(kc, entry->u.sim.kc, num_chal * EAP_SIM_KC_LEN);
- os_free(entry);
- return num_chal;
- }
-
- if (data->sock < 0) {
- if (eap_sim_db_open_socket(data) < 0)
- return EAP_SIM_DB_FAILURE;
- }
-
- len = os_snprintf(msg, sizeof(msg), "SIM-REQ-AUTH ");
- if (len < 0 || len + identity_len >= sizeof(msg))
- return EAP_SIM_DB_FAILURE;
- os_memcpy(msg + len, identity, identity_len);
- len += identity_len;
- ret = os_snprintf(msg + len, sizeof(msg) - len, " %d", max_chal);
- if (ret < 0 || (size_t) ret >= sizeof(msg) - len)
- return EAP_SIM_DB_FAILURE;
- len += ret;
-
- wpa_hexdump(MSG_DEBUG, "EAP-SIM DB: requesting SIM authentication "
- "data for IMSI", identity, identity_len);
- if (eap_sim_db_send(data, msg, len) < 0)
- return EAP_SIM_DB_FAILURE;
-
- entry = os_zalloc(sizeof(*entry));
- if (entry == NULL)
- return EAP_SIM_DB_FAILURE;
-
- os_get_time(&entry->timestamp);
- os_memcpy(entry->imsi, identity, identity_len);
- entry->imsi_len = identity_len;
- entry->cb_session_ctx = cb_session_ctx;
- entry->state = PENDING;
- eap_sim_db_add_pending(data, entry);
- eap_sim_db_expire_pending(data);
-
- return EAP_SIM_DB_PENDING;
-}
-
-
-static struct eap_sim_pseudonym *
-eap_sim_db_get_pseudonym(struct eap_sim_db_data *data, const u8 *identity,
- size_t identity_len)
-{
- char *pseudonym;
- size_t len;
- struct eap_sim_pseudonym *p;
-
- if (identity_len == 0 ||
- (identity[0] != EAP_SIM_PSEUDONYM_PREFIX &&
- identity[0] != EAP_AKA_PSEUDONYM_PREFIX))
- return NULL;
-
- /* Remove possible realm from identity */
- len = 0;
- while (len < identity_len) {
- if (identity[len] == '@')
- break;
- len++;
- }
-
- pseudonym = os_malloc(len + 1);
- if (pseudonym == NULL)
- return NULL;
- os_memcpy(pseudonym, identity, len);
- pseudonym[len] = '\0';
-
- p = data->pseudonyms;
- while (p) {
- if (os_strcmp(p->pseudonym, pseudonym) == 0)
- break;
- p = p->next;
- }
-
- os_free(pseudonym);
-
- return p;
-}
-
-
-static struct eap_sim_pseudonym *
-eap_sim_db_get_pseudonym_id(struct eap_sim_db_data *data, const u8 *identity,
- size_t identity_len)
-{
- struct eap_sim_pseudonym *p;
-
- if (identity_len == 0 ||
- (identity[0] != EAP_SIM_PERMANENT_PREFIX &&
- identity[0] != EAP_AKA_PERMANENT_PREFIX))
- return NULL;
-
- p = data->pseudonyms;
- while (p) {
- if (identity_len == p->identity_len &&
- os_memcmp(p->identity, identity, identity_len) == 0)
- break;
- p = p->next;
- }
-
- return p;
-}
-
-
-static struct eap_sim_reauth *
-eap_sim_db_get_reauth(struct eap_sim_db_data *data, const u8 *identity,
- size_t identity_len)
-{
- char *reauth_id;
- size_t len;
- struct eap_sim_reauth *r;
-
- if (identity_len == 0 ||
- (identity[0] != EAP_SIM_REAUTH_ID_PREFIX &&
- identity[0] != EAP_AKA_REAUTH_ID_PREFIX))
- return NULL;
-
- /* Remove possible realm from identity */
- len = 0;
- while (len < identity_len) {
- if (identity[len] == '@')
- break;
- len++;
- }
-
- reauth_id = os_malloc(len + 1);
- if (reauth_id == NULL)
- return NULL;
- os_memcpy(reauth_id, identity, len);
- reauth_id[len] = '\0';
-
- r = data->reauths;
- while (r) {
- if (os_strcmp(r->reauth_id, reauth_id) == 0)
- break;
- r = r->next;
- }
-
- os_free(reauth_id);
-
- return r;
-}
-
-
-static struct eap_sim_reauth *
-eap_sim_db_get_reauth_id(struct eap_sim_db_data *data, const u8 *identity,
- size_t identity_len)
-{
- struct eap_sim_pseudonym *p;
- struct eap_sim_reauth *r;
-
- if (identity_len == 0)
- return NULL;
-
- p = eap_sim_db_get_pseudonym(data, identity, identity_len);
- if (p == NULL)
- p = eap_sim_db_get_pseudonym_id(data, identity, identity_len);
- if (p) {
- identity = p->identity;
- identity_len = p->identity_len;
- }
-
- r = data->reauths;
- while (r) {
- if (identity_len == r->identity_len &&
- os_memcmp(r->identity, identity, identity_len) == 0)
- break;
- r = r->next;
- }
-
- return r;
-}
-
-
-/**
- * eap_sim_db_identity_known - Verify whether the given identity is known
- * @priv: Private data pointer from eap_sim_db_init()
- * @identity: User name identity
- * @identity_len: Length of identity in bytes
- * Returns: 0 if the user is found or -1 on failure
- *
- * In most cases, the user name is ['0','1'] | IMSI, i.e., 1 followed by the
- * IMSI in ASCII format, ['2','3'] | pseudonym, or ['4','5'] | reauth_id.
- */
-int eap_sim_db_identity_known(void *priv, const u8 *identity,
- size_t identity_len)
-{
- struct eap_sim_db_data *data = priv;
-
- if (identity == NULL || identity_len < 2)
- return -1;
-
- if (identity[0] == EAP_SIM_PSEUDONYM_PREFIX ||
- identity[0] == EAP_AKA_PSEUDONYM_PREFIX) {
- struct eap_sim_pseudonym *p =
- eap_sim_db_get_pseudonym(data, identity, identity_len);
- return p ? 0 : -1;
- }
-
- if (identity[0] == EAP_SIM_REAUTH_ID_PREFIX ||
- identity[0] == EAP_AKA_REAUTH_ID_PREFIX) {
- struct eap_sim_reauth *r =
- eap_sim_db_get_reauth(data, identity, identity_len);
- return r ? 0 : -1;
- }
-
- if (identity[0] != EAP_SIM_PERMANENT_PREFIX &&
- identity[0] != EAP_AKA_PERMANENT_PREFIX) {
- /* Unknown identity prefix */
- return -1;
- }
-
- /* TODO: Should consider asking HLR/AuC gateway whether this permanent
- * identity is known. If it is, EAP-SIM/AKA can skip identity request.
- * In case of EAP-AKA, this would reduce number of needed round-trips.
- * Ideally, this would be done with one wait, i.e., just request
- * authentication data and store it for the next use. This would then
- * need to use similar pending-request functionality as the normal
- * request for authentication data at later phase.
- */
- return -1;
-}
-
-
-static char * eap_sim_db_get_next(struct eap_sim_db_data *data, char prefix)
-{
- char *id, *pos, *end;
- u8 buf[10];
-
- if (os_get_random(buf, sizeof(buf)))
- return NULL;
- id = os_malloc(sizeof(buf) * 2 + 2);
- if (id == NULL)
- return NULL;
-
- pos = id;
- end = id + sizeof(buf) * 2 + 2;
- *pos++ = prefix;
- pos += wpa_snprintf_hex(pos, end - pos, buf, sizeof(buf));
-
- return id;
-}
-
-
-/**
- * eap_sim_db_get_next_pseudonym - EAP-SIM DB: Get next pseudonym
- * @priv: Private data pointer from eap_sim_db_init()
- * @aka: Using EAP-AKA instead of EAP-SIM
- * Returns: Next pseudonym (allocated string) or %NULL on failure
- *
- * This function is used to generate a pseudonym for EAP-SIM. The returned
- * pseudonym is not added to database at this point; it will need to be added
- * with eap_sim_db_add_pseudonym() once the authentication has been completed
- * successfully. Caller is responsible for freeing the returned buffer.
- */
-char * eap_sim_db_get_next_pseudonym(void *priv, int aka)
-{
- struct eap_sim_db_data *data = priv;
- return eap_sim_db_get_next(data, aka ? EAP_AKA_PSEUDONYM_PREFIX :
- EAP_SIM_PSEUDONYM_PREFIX);
-}
-
-
-/**
- * eap_sim_db_get_next_reauth_id - EAP-SIM DB: Get next reauth_id
- * @priv: Private data pointer from eap_sim_db_init()
- * @aka: Using EAP-AKA instead of EAP-SIM
- * Returns: Next reauth_id (allocated string) or %NULL on failure
- *
- * This function is used to generate a fast re-authentication identity for
- * EAP-SIM. The returned reauth_id is not added to database at this point; it
- * will need to be added with eap_sim_db_add_reauth() once the authentication
- * has been completed successfully. Caller is responsible for freeing the
- * returned buffer.
- */
-char * eap_sim_db_get_next_reauth_id(void *priv, int aka)
-{
- struct eap_sim_db_data *data = priv;
- return eap_sim_db_get_next(data, aka ? EAP_AKA_REAUTH_ID_PREFIX :
- EAP_SIM_REAUTH_ID_PREFIX);
-}
-
-
-/**
- * eap_sim_db_add_pseudonym - EAP-SIM DB: Add new pseudonym
- * @priv: Private data pointer from eap_sim_db_init()
- * @identity: Identity of the user (may be permanent identity or pseudonym)
- * @identity_len: Length of identity
- * @pseudonym: Pseudonym for this user. This needs to be an allocated buffer,
- * e.g., return value from eap_sim_db_get_next_pseudonym(). Caller must not
- * free it.
- * Returns: 0 on success, -1 on failure
- *
- * This function adds a new pseudonym for EAP-SIM user. EAP-SIM DB is
- * responsible of freeing pseudonym buffer once it is not needed anymore.
- */
-int eap_sim_db_add_pseudonym(void *priv, const u8 *identity,
- size_t identity_len, char *pseudonym)
-{
- struct eap_sim_db_data *data = priv;
- struct eap_sim_pseudonym *p;
- wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM DB: Add pseudonym for identity",
- identity, identity_len);
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: Pseudonym: %s", pseudonym);
-
- /* TODO: could store last two pseudonyms */
- p = eap_sim_db_get_pseudonym(data, identity, identity_len);
- if (p == NULL)
- p = eap_sim_db_get_pseudonym_id(data, identity, identity_len);
-
- if (p) {
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: Replacing previous "
- "pseudonym: %s", p->pseudonym);
- os_free(p->pseudonym);
- p->pseudonym = pseudonym;
- return 0;
- }
-
- p = os_zalloc(sizeof(*p));
- if (p == NULL) {
- os_free(pseudonym);
- return -1;
- }
-
- p->next = data->pseudonyms;
- p->identity = os_malloc(identity_len);
- if (p->identity == NULL) {
- os_free(p);
- os_free(pseudonym);
- return -1;
- }
- os_memcpy(p->identity, identity, identity_len);
- p->identity_len = identity_len;
- p->pseudonym = pseudonym;
- data->pseudonyms = p;
-
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: Added new pseudonym entry");
- return 0;
-}
-
-
-static struct eap_sim_reauth *
-eap_sim_db_add_reauth_data(struct eap_sim_db_data *data, const u8 *identity,
- size_t identity_len, char *reauth_id, u16 counter)
-{
- struct eap_sim_reauth *r;
-
- wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM DB: Add reauth_id for identity",
- identity, identity_len);
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: reauth_id: %s", reauth_id);
-
- r = eap_sim_db_get_reauth(data, identity, identity_len);
- if (r == NULL)
- r = eap_sim_db_get_reauth_id(data, identity, identity_len);
-
- if (r) {
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: Replacing previous "
- "reauth_id: %s", r->reauth_id);
- os_free(r->reauth_id);
- r->reauth_id = reauth_id;
- } else {
- r = os_zalloc(sizeof(*r));
- if (r == NULL) {
- os_free(reauth_id);
- return NULL;
- }
-
- r->next = data->reauths;
- r->identity = os_malloc(identity_len);
- if (r->identity == NULL) {
- os_free(r);
- os_free(reauth_id);
- return NULL;
- }
- os_memcpy(r->identity, identity, identity_len);
- r->identity_len = identity_len;
- r->reauth_id = reauth_id;
- data->reauths = r;
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: Added new reauth entry");
- }
-
- r->counter = counter;
-
- return r;
-}
-
-
-/**
- * eap_sim_db_add_reauth - EAP-SIM DB: Add new re-authentication entry
- * @priv: Private data pointer from eap_sim_db_init()
- * @identity: Identity of the user (may be permanent identity or pseudonym)
- * @identity_len: Length of identity
- * @reauth_id: reauth_id for this user. This needs to be an allocated buffer,
- * e.g., return value from eap_sim_db_get_next_reauth_id(). Caller must not
- * free it.
- * @counter: AT_COUNTER value for fast re-authentication
- * @mk: 16-byte MK from the previous full authentication or %NULL
- * Returns: 0 on success, -1 on failure
- *
- * This function adds a new re-authentication entry for an EAP-SIM user.
- * EAP-SIM DB is responsible of freeing reauth_id buffer once it is not needed
- * anymore.
- */
-int eap_sim_db_add_reauth(void *priv, const u8 *identity,
- size_t identity_len, char *reauth_id, u16 counter,
- const u8 *mk)
-{
- struct eap_sim_db_data *data = priv;
- struct eap_sim_reauth *r;
-
- r = eap_sim_db_add_reauth_data(data, identity, identity_len, reauth_id,
- counter);
- if (r == NULL)
- return -1;
-
- os_memcpy(r->mk, mk, EAP_SIM_MK_LEN);
- r->aka_prime = 0;
-
- return 0;
-}
-
-
-#ifdef EAP_SERVER_AKA_PRIME
-/**
- * eap_sim_db_add_reauth_prime - EAP-AKA' DB: Add new re-authentication entry
- * @priv: Private data pointer from eap_sim_db_init()
- * @identity: Identity of the user (may be permanent identity or pseudonym)
- * @identity_len: Length of identity
- * @reauth_id: reauth_id for this user. This needs to be an allocated buffer,
- * e.g., return value from eap_sim_db_get_next_reauth_id(). Caller must not
- * free it.
- * @counter: AT_COUNTER value for fast re-authentication
- * @k_encr: K_encr from the previous full authentication
- * @k_aut: K_aut from the previous full authentication
- * @k_re: 32-byte K_re from the previous full authentication
- * Returns: 0 on success, -1 on failure
- *
- * This function adds a new re-authentication entry for an EAP-AKA' user.
- * EAP-SIM DB is responsible of freeing reauth_id buffer once it is not needed
- * anymore.
- */
-int eap_sim_db_add_reauth_prime(void *priv, const u8 *identity,
- size_t identity_len, char *reauth_id,
- u16 counter, const u8 *k_encr, const u8 *k_aut,
- const u8 *k_re)
-{
- struct eap_sim_db_data *data = priv;
- struct eap_sim_reauth *r;
-
- r = eap_sim_db_add_reauth_data(data, identity, identity_len, reauth_id,
- counter);
- if (r == NULL)
- return -1;
-
- r->aka_prime = 1;
- os_memcpy(r->k_encr, k_encr, EAP_SIM_K_ENCR_LEN);
- os_memcpy(r->k_aut, k_aut, EAP_AKA_PRIME_K_AUT_LEN);
- os_memcpy(r->k_re, k_re, EAP_AKA_PRIME_K_RE_LEN);
-
- return 0;
-}
-#endif /* EAP_SERVER_AKA_PRIME */
-
-
-/**
- * eap_sim_db_get_permanent - EAP-SIM DB: Get permanent identity
- * @priv: Private data pointer from eap_sim_db_init()
- * @identity: Identity of the user (may be permanent identity or pseudonym)
- * @identity_len: Length of identity
- * @len: Buffer for length of the returned permanent identity
- * Returns: Pointer to the permanent identity, or %NULL if not found
- */
-const u8 * eap_sim_db_get_permanent(void *priv, const u8 *identity,
- size_t identity_len, size_t *len)
-{
- struct eap_sim_db_data *data = priv;
- struct eap_sim_pseudonym *p;
-
- if (identity == NULL)
- return NULL;
-
- p = eap_sim_db_get_pseudonym(data, identity, identity_len);
- if (p == NULL)
- p = eap_sim_db_get_pseudonym_id(data, identity, identity_len);
- if (p == NULL)
- return NULL;
-
- *len = p->identity_len;
- return p->identity;
-}
-
-
-/**
- * eap_sim_db_get_reauth_entry - EAP-SIM DB: Get re-authentication entry
- * @priv: Private data pointer from eap_sim_db_init()
- * @identity: Identity of the user (may be permanent identity, pseudonym, or
- * reauth_id)
- * @identity_len: Length of identity
- * Returns: Pointer to the re-auth entry, or %NULL if not found
- */
-struct eap_sim_reauth *
-eap_sim_db_get_reauth_entry(void *priv, const u8 *identity,
- size_t identity_len)
-{
- struct eap_sim_db_data *data = priv;
- struct eap_sim_reauth *r;
-
- if (identity == NULL)
- return NULL;
- r = eap_sim_db_get_reauth(data, identity, identity_len);
- if (r == NULL)
- r = eap_sim_db_get_reauth_id(data, identity, identity_len);
- return r;
-}
-
-
-/**
- * eap_sim_db_remove_reauth - EAP-SIM DB: Remove re-authentication entry
- * @priv: Private data pointer from eap_sim_db_init()
- * @reauth: Pointer to re-authentication entry from
- * eap_sim_db_get_reauth_entry()
- */
-void eap_sim_db_remove_reauth(void *priv, struct eap_sim_reauth *reauth)
-{
- struct eap_sim_db_data *data = priv;
- struct eap_sim_reauth *r, *prev = NULL;
- r = data->reauths;
- while (r) {
- if (r == reauth) {
- if (prev)
- prev->next = r->next;
- else
- data->reauths = r->next;
- eap_sim_db_free_reauth(r);
- return;
- }
- prev = r;
- r = r->next;
- }
-}
-
-
-/**
- * eap_sim_db_get_aka_auth - Get AKA authentication values
- * @priv: Private data pointer from eap_sim_db_init()
- * @identity: User name identity
- * @identity_len: Length of identity in bytes
- * @_rand: Buffer for RAND value
- * @autn: Buffer for AUTN value
- * @ik: Buffer for IK value
- * @ck: Buffer for CK value
- * @res: Buffer for RES value
- * @res_len: Buffer for RES length
- * @cb_session_ctx: Session callback context for get_complete_cb()
- * Returns: 0 on success, -1 (EAP_SIM_DB_FAILURE) on error (e.g., user not
- * found), or -2 (EAP_SIM_DB_PENDING) if results are not yet available. In this
- * case, the callback function registered with eap_sim_db_init() will be
- * called once the results become available.
- *
- * In most cases, the user name is '0' | IMSI, i.e., 0 followed by the IMSI in
- * ASCII format.
- *
- * When using an external server for AKA authentication, this function can
- * always start a request and return EAP_SIM_DB_PENDING immediately if
- * authentication triplets are not available. Once the authentication data are
- * received, callback function registered with eap_sim_db_init() is called to
- * notify EAP state machine to reprocess the message. This
- * eap_sim_db_get_aka_auth() function will then be called again and the newly
- * received triplets will then be given to the caller.
- */
-int eap_sim_db_get_aka_auth(void *priv, const u8 *identity,
- size_t identity_len, u8 *_rand, u8 *autn, u8 *ik,
- u8 *ck, u8 *res, size_t *res_len,
- void *cb_session_ctx)
-{
- struct eap_sim_db_data *data = priv;
- struct eap_sim_db_pending *entry;
- int len;
- size_t i;
- char msg[40];
-
- if (identity_len < 2 || identity == NULL ||
- identity[0] != EAP_AKA_PERMANENT_PREFIX) {
- wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM DB: unexpected identity",
- identity, identity_len);
- return EAP_SIM_DB_FAILURE;
- }
- identity++;
- identity_len--;
- for (i = 0; i < identity_len; i++) {
- if (identity[i] == '@') {
- identity_len = i;
- break;
- }
- }
- if (identity_len + 1 > sizeof(entry->imsi)) {
- wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM DB: unexpected identity",
- identity, identity_len);
- return EAP_SIM_DB_FAILURE;
- }
- wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM DB: Get AKA auth for IMSI",
- identity, identity_len);
-
- entry = eap_sim_db_get_pending(data, identity, identity_len, 1);
- if (entry) {
- if (entry->state == FAILURE) {
- os_free(entry);
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: Failure");
- return EAP_SIM_DB_FAILURE;
- }
-
- if (entry->state == PENDING) {
- eap_sim_db_add_pending(data, entry);
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: Pending");
- return EAP_SIM_DB_PENDING;
- }
-
- wpa_printf(MSG_DEBUG, "EAP-SIM DB: Returning successfully "
- "received authentication data");
- os_memcpy(_rand, entry->u.aka.rand, EAP_AKA_RAND_LEN);
- os_memcpy(autn, entry->u.aka.autn, EAP_AKA_AUTN_LEN);
- os_memcpy(ik, entry->u.aka.ik, EAP_AKA_IK_LEN);
- os_memcpy(ck, entry->u.aka.ck, EAP_AKA_CK_LEN);
- os_memcpy(res, entry->u.aka.res, EAP_AKA_RES_MAX_LEN);
- *res_len = entry->u.aka.res_len;
- os_free(entry);
- return 0;
- }
-
- if (data->sock < 0) {
- if (eap_sim_db_open_socket(data) < 0)
- return EAP_SIM_DB_FAILURE;
- }
-
- len = os_snprintf(msg, sizeof(msg), "AKA-REQ-AUTH ");
- if (len < 0 || len + identity_len >= sizeof(msg))
- return EAP_SIM_DB_FAILURE;
- os_memcpy(msg + len, identity, identity_len);
- len += identity_len;
-
- wpa_hexdump(MSG_DEBUG, "EAP-SIM DB: requesting AKA authentication "
- "data for IMSI", identity, identity_len);
- if (eap_sim_db_send(data, msg, len) < 0)
- return EAP_SIM_DB_FAILURE;
-
- entry = os_zalloc(sizeof(*entry));
- if (entry == NULL)
- return EAP_SIM_DB_FAILURE;
-
- os_get_time(&entry->timestamp);
- entry->aka = 1;
- os_memcpy(entry->imsi, identity, identity_len);
- entry->imsi_len = identity_len;
- entry->cb_session_ctx = cb_session_ctx;
- entry->state = PENDING;
- eap_sim_db_add_pending(data, entry);
- eap_sim_db_expire_pending(data);
-
- return EAP_SIM_DB_PENDING;
-}
-
-
-/**
- * eap_sim_db_resynchronize - Resynchronize AKA AUTN
- * @priv: Private data pointer from eap_sim_db_init()
- * @identity: User name identity
- * @identity_len: Length of identity in bytes
- * @auts: AUTS value from the peer
- * @_rand: RAND value used in the rejected message
- * Returns: 0 on success, -1 on failure
- *
- * This function is called when the peer reports synchronization failure in the
- * AUTN value by sending AUTS. The AUTS and RAND values should be sent to
- * HLR/AuC to allow it to resynchronize with the peer. After this,
- * eap_sim_db_get_aka_auth() will be called again to to fetch updated
- * RAND/AUTN values for the next challenge.
- */
-int eap_sim_db_resynchronize(void *priv, const u8 *identity,
- size_t identity_len, const u8 *auts,
- const u8 *_rand)
-{
- struct eap_sim_db_data *data = priv;
- size_t i;
-
- if (identity_len < 2 || identity == NULL ||
- identity[0] != EAP_AKA_PERMANENT_PREFIX) {
- wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM DB: unexpected identity",
- identity, identity_len);
- return -1;
- }
- identity++;
- identity_len--;
- for (i = 0; i < identity_len; i++) {
- if (identity[i] == '@') {
- identity_len = i;
- break;
- }
- }
- if (identity_len > 20) {
- wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM DB: unexpected identity",
- identity, identity_len);
- return -1;
- }
-
- if (data->sock >= 0) {
- char msg[100];
- int len, ret;
-
- len = os_snprintf(msg, sizeof(msg), "AKA-AUTS ");
- if (len < 0 || len + identity_len >= sizeof(msg))
- return -1;
- os_memcpy(msg + len, identity, identity_len);
- len += identity_len;
-
- ret = os_snprintf(msg + len, sizeof(msg) - len, " ");
- if (ret < 0 || (size_t) ret >= sizeof(msg) - len)
- return -1;
- len += ret;
- len += wpa_snprintf_hex(msg + len, sizeof(msg) - len,
- auts, EAP_AKA_AUTS_LEN);
- ret = os_snprintf(msg + len, sizeof(msg) - len, " ");
- if (ret < 0 || (size_t) ret >= sizeof(msg) - len)
- return -1;
- len += ret;
- len += wpa_snprintf_hex(msg + len, sizeof(msg) - len,
- _rand, EAP_AKA_RAND_LEN);
- wpa_hexdump(MSG_DEBUG, "EAP-SIM DB: reporting AKA AUTS for "
- "IMSI", identity, identity_len);
- if (eap_sim_db_send(data, msg, len) < 0)
- return -1;
- }
-
- return 0;
-}
projects / mech_eap.git / blobdiff