+++ /dev/null
-/*
- * RADIUS message processing
- * Copyright (c) 2002-2009, 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.
- */
-
-#include "utils/includes.h"
-
-#include "utils/common.h"
-#include "utils/wpabuf.h"
-#include "crypto/md5.h"
-#include "crypto/crypto.h"
-#include "radius.h"
-
-
-/**
- * struct radius_msg - RADIUS message structure for new and parsed messages
- */
-struct radius_msg {
- /**
- * buf - Allocated buffer for RADIUS message
- */
- struct wpabuf *buf;
-
- /**
- * hdr - Pointer to the RADIUS header in buf
- */
- struct radius_hdr *hdr;
-
- /**
- * attr_pos - Array of indexes to attributes
- *
- * The values are number of bytes from buf to the beginning of
- * struct radius_attr_hdr.
- */
- size_t *attr_pos;
-
- /**
- * attr_size - Total size of the attribute pointer array
- */
- size_t attr_size;
-
- /**
- * attr_used - Total number of attributes in the array
- */
- size_t attr_used;
-};
-
-
-struct radius_hdr * radius_msg_get_hdr(struct radius_msg *msg)
-{
- return msg->hdr;
-}
-
-
-struct wpabuf * radius_msg_get_buf(struct radius_msg *msg)
-{
- return msg->buf;
-}
-
-
-static struct radius_attr_hdr *
-radius_get_attr_hdr(struct radius_msg *msg, int idx)
-{
- return (struct radius_attr_hdr *)
- (wpabuf_mhead_u8(msg->buf) + msg->attr_pos[idx]);
-}
-
-
-static void radius_msg_set_hdr(struct radius_msg *msg, u8 code, u8 identifier)
-{
- msg->hdr->code = code;
- msg->hdr->identifier = identifier;
-}
-
-
-static int radius_msg_initialize(struct radius_msg *msg)
-{
- msg->attr_pos =
- os_zalloc(RADIUS_DEFAULT_ATTR_COUNT * sizeof(*msg->attr_pos));
- if (msg->attr_pos == NULL)
- return -1;
-
- msg->attr_size = RADIUS_DEFAULT_ATTR_COUNT;
- msg->attr_used = 0;
-
- return 0;
-}
-
-
-/**
- * radius_msg_new - Create a new RADIUS message
- * @code: Code for RADIUS header
- * @identifier: Identifier for RADIUS header
- * Returns: Context for RADIUS message or %NULL on failure
- *
- * The caller is responsible for freeing the returned data with
- * radius_msg_free().
- */
-struct radius_msg * radius_msg_new(u8 code, u8 identifier)
-{
- struct radius_msg *msg;
-
- msg = os_zalloc(sizeof(*msg));
- if (msg == NULL)
- return NULL;
-
- msg->buf = wpabuf_alloc(RADIUS_DEFAULT_MSG_SIZE);
- if (msg->buf == NULL || radius_msg_initialize(msg)) {
- radius_msg_free(msg);
- return NULL;
- }
- msg->hdr = wpabuf_put(msg->buf, sizeof(struct radius_hdr));
-
- radius_msg_set_hdr(msg, code, identifier);
-
- return msg;
-}
-
-
-/**
- * radius_msg_free - Free a RADIUS message
- * @msg: RADIUS message from radius_msg_new() or radius_msg_parse()
- */
-void radius_msg_free(struct radius_msg *msg)
-{
- if (msg == NULL)
- return;
-
- wpabuf_free(msg->buf);
- os_free(msg->attr_pos);
- os_free(msg);
-}
-
-
-static const char *radius_code_string(u8 code)
-{
- switch (code) {
- case RADIUS_CODE_ACCESS_REQUEST: return "Access-Request";
- case RADIUS_CODE_ACCESS_ACCEPT: return "Access-Accept";
- case RADIUS_CODE_ACCESS_REJECT: return "Access-Reject";
- case RADIUS_CODE_ACCOUNTING_REQUEST: return "Accounting-Request";
- case RADIUS_CODE_ACCOUNTING_RESPONSE: return "Accounting-Response";
- case RADIUS_CODE_ACCESS_CHALLENGE: return "Access-Challenge";
- case RADIUS_CODE_STATUS_SERVER: return "Status-Server";
- case RADIUS_CODE_STATUS_CLIENT: return "Status-Client";
- case RADIUS_CODE_RESERVED: return "Reserved";
- default: return "?Unknown?";
- }
-}
-
-
-struct radius_attr_type {
- u8 type;
- char *name;
- enum {
- RADIUS_ATTR_UNDIST, RADIUS_ATTR_TEXT, RADIUS_ATTR_IP,
- RADIUS_ATTR_HEXDUMP, RADIUS_ATTR_INT32, RADIUS_ATTR_IPV6
- } data_type;
-};
-
-static struct radius_attr_type radius_attrs[] =
-{
- { RADIUS_ATTR_USER_NAME, "User-Name", RADIUS_ATTR_TEXT },
- { RADIUS_ATTR_USER_PASSWORD, "User-Password", RADIUS_ATTR_UNDIST },
- { RADIUS_ATTR_NAS_IP_ADDRESS, "NAS-IP-Address", RADIUS_ATTR_IP },
- { RADIUS_ATTR_NAS_PORT, "NAS-Port", RADIUS_ATTR_INT32 },
- { RADIUS_ATTR_FRAMED_MTU, "Framed-MTU", RADIUS_ATTR_INT32 },
- { RADIUS_ATTR_REPLY_MESSAGE, "Reply-Message", RADIUS_ATTR_TEXT },
- { RADIUS_ATTR_STATE, "State", RADIUS_ATTR_UNDIST },
- { RADIUS_ATTR_CLASS, "Class", RADIUS_ATTR_UNDIST },
- { RADIUS_ATTR_VENDOR_SPECIFIC, "Vendor-Specific", RADIUS_ATTR_UNDIST },
- { RADIUS_ATTR_SESSION_TIMEOUT, "Session-Timeout", RADIUS_ATTR_INT32 },
- { RADIUS_ATTR_IDLE_TIMEOUT, "Idle-Timeout", RADIUS_ATTR_INT32 },
- { RADIUS_ATTR_TERMINATION_ACTION, "Termination-Action",
- RADIUS_ATTR_INT32 },
- { RADIUS_ATTR_CALLED_STATION_ID, "Called-Station-Id",
- RADIUS_ATTR_TEXT },
- { RADIUS_ATTR_CALLING_STATION_ID, "Calling-Station-Id",
- RADIUS_ATTR_TEXT },
- { RADIUS_ATTR_NAS_IDENTIFIER, "NAS-Identifier", RADIUS_ATTR_TEXT },
- { RADIUS_ATTR_PROXY_STATE, "Proxy-State", RADIUS_ATTR_UNDIST },
- { RADIUS_ATTR_ACCT_STATUS_TYPE, "Acct-Status-Type",
- RADIUS_ATTR_INT32 },
- { RADIUS_ATTR_ACCT_DELAY_TIME, "Acct-Delay-Time", RADIUS_ATTR_INT32 },
- { RADIUS_ATTR_ACCT_INPUT_OCTETS, "Acct-Input-Octets",
- RADIUS_ATTR_INT32 },
- { RADIUS_ATTR_ACCT_OUTPUT_OCTETS, "Acct-Output-Octets",
- RADIUS_ATTR_INT32 },
- { RADIUS_ATTR_ACCT_SESSION_ID, "Acct-Session-Id", RADIUS_ATTR_TEXT },
- { RADIUS_ATTR_ACCT_AUTHENTIC, "Acct-Authentic", RADIUS_ATTR_INT32 },
- { RADIUS_ATTR_ACCT_SESSION_TIME, "Acct-Session-Time",
- RADIUS_ATTR_INT32 },
- { RADIUS_ATTR_ACCT_INPUT_PACKETS, "Acct-Input-Packets",
- RADIUS_ATTR_INT32 },
- { RADIUS_ATTR_ACCT_OUTPUT_PACKETS, "Acct-Output-Packets",
- RADIUS_ATTR_INT32 },
- { RADIUS_ATTR_ACCT_TERMINATE_CAUSE, "Acct-Terminate-Cause",
- RADIUS_ATTR_INT32 },
- { RADIUS_ATTR_ACCT_MULTI_SESSION_ID, "Acct-Multi-Session-Id",
- RADIUS_ATTR_TEXT },
- { RADIUS_ATTR_ACCT_LINK_COUNT, "Acct-Link-Count", RADIUS_ATTR_INT32 },
- { RADIUS_ATTR_ACCT_INPUT_GIGAWORDS, "Acct-Input-Gigawords",
- RADIUS_ATTR_INT32 },
- { RADIUS_ATTR_ACCT_OUTPUT_GIGAWORDS, "Acct-Output-Gigawords",
- RADIUS_ATTR_INT32 },
- { RADIUS_ATTR_EVENT_TIMESTAMP, "Event-Timestamp",
- RADIUS_ATTR_INT32 },
- { RADIUS_ATTR_NAS_PORT_TYPE, "NAS-Port-Type", RADIUS_ATTR_INT32 },
- { RADIUS_ATTR_TUNNEL_TYPE, "Tunnel-Type", RADIUS_ATTR_HEXDUMP },
- { RADIUS_ATTR_TUNNEL_MEDIUM_TYPE, "Tunnel-Medium-Type",
- RADIUS_ATTR_HEXDUMP },
- { RADIUS_ATTR_CONNECT_INFO, "Connect-Info", RADIUS_ATTR_TEXT },
- { RADIUS_ATTR_EAP_MESSAGE, "EAP-Message", RADIUS_ATTR_UNDIST },
- { RADIUS_ATTR_MESSAGE_AUTHENTICATOR, "Message-Authenticator",
- RADIUS_ATTR_UNDIST },
- { RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID, "Tunnel-Private-Group-Id",
- RADIUS_ATTR_HEXDUMP },
- { RADIUS_ATTR_ACCT_INTERIM_INTERVAL, "Acct-Interim-Interval",
- RADIUS_ATTR_INT32 },
- { RADIUS_ATTR_CHARGEABLE_USER_IDENTITY, "Chargable-User-Identity",
- RADIUS_ATTR_TEXT },
- { RADIUS_ATTR_NAS_IPV6_ADDRESS, "NAS-IPv6-Address", RADIUS_ATTR_IPV6 },
-};
-#define RADIUS_ATTRS (sizeof(radius_attrs) / sizeof(radius_attrs[0]))
-
-
-static struct radius_attr_type *radius_get_attr_type(u8 type)
-{
- size_t i;
-
- for (i = 0; i < RADIUS_ATTRS; i++) {
- if (type == radius_attrs[i].type)
- return &radius_attrs[i];
- }
-
- return NULL;
-}
-
-
-static void print_char(char c)
-{
- if (c >= 32 && c < 127)
- printf("%c", c);
- else
- printf("<%02x>", c);
-}
-
-
-static void radius_msg_dump_attr(struct radius_attr_hdr *hdr)
-{
- struct radius_attr_type *attr;
- int i, len;
- unsigned char *pos;
-
- attr = radius_get_attr_type(hdr->type);
-
- printf(" Attribute %d (%s) length=%d\n",
- hdr->type, attr ? attr->name : "?Unknown?", hdr->length);
-
- if (attr == NULL)
- return;
-
- len = hdr->length - sizeof(struct radius_attr_hdr);
- pos = (unsigned char *) (hdr + 1);
-
- switch (attr->data_type) {
- case RADIUS_ATTR_TEXT:
- printf(" Value: '");
- for (i = 0; i < len; i++)
- print_char(pos[i]);
- printf("'\n");
- break;
-
- case RADIUS_ATTR_IP:
- if (len == 4) {
- struct in_addr addr;
- os_memcpy(&addr, pos, 4);
- printf(" Value: %s\n", inet_ntoa(addr));
- } else
- printf(" Invalid IP address length %d\n", len);
- break;
-
-#ifdef CONFIG_IPV6
- case RADIUS_ATTR_IPV6:
- if (len == 16) {
- char buf[128];
- const char *atxt;
- struct in6_addr *addr = (struct in6_addr *) pos;
- atxt = inet_ntop(AF_INET6, addr, buf, sizeof(buf));
- printf(" Value: %s\n", atxt ? atxt : "?");
- } else
- printf(" Invalid IPv6 address length %d\n", len);
- break;
-#endif /* CONFIG_IPV6 */
-
- case RADIUS_ATTR_HEXDUMP:
- case RADIUS_ATTR_UNDIST:
- printf(" Value:");
- for (i = 0; i < len; i++)
- printf(" %02x", pos[i]);
- printf("\n");
- break;
-
- case RADIUS_ATTR_INT32:
- if (len == 4)
- printf(" Value: %u\n", WPA_GET_BE32(pos));
- else
- printf(" Invalid INT32 length %d\n", len);
- break;
-
- default:
- break;
- }
-}
-
-
-void radius_msg_dump(struct radius_msg *msg)
-{
- size_t i;
-
- printf("RADIUS message: code=%d (%s) identifier=%d length=%d\n",
- msg->hdr->code, radius_code_string(msg->hdr->code),
- msg->hdr->identifier, ntohs(msg->hdr->length));
-
- for (i = 0; i < msg->attr_used; i++) {
- struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
- radius_msg_dump_attr(attr);
- }
-}
-
-
-int radius_msg_finish(struct radius_msg *msg, const u8 *secret,
- size_t secret_len)
-{
- if (secret) {
- u8 auth[MD5_MAC_LEN];
- struct radius_attr_hdr *attr;
-
- os_memset(auth, 0, MD5_MAC_LEN);
- attr = radius_msg_add_attr(msg,
- RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
- auth, MD5_MAC_LEN);
- if (attr == NULL) {
- wpa_printf(MSG_WARNING, "RADIUS: Could not add "
- "Message-Authenticator");
- return -1;
- }
- msg->hdr->length = htons(wpabuf_len(msg->buf));
- hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
- wpabuf_len(msg->buf), (u8 *) (attr + 1));
- } else
- msg->hdr->length = htons(wpabuf_len(msg->buf));
-
- if (wpabuf_len(msg->buf) > 0xffff) {
- wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
- (unsigned long) wpabuf_len(msg->buf));
- return -1;
- }
- return 0;
-}
-
-
-int radius_msg_finish_srv(struct radius_msg *msg, const u8 *secret,
- size_t secret_len, const u8 *req_authenticator)
-{
- u8 auth[MD5_MAC_LEN];
- struct radius_attr_hdr *attr;
- const u8 *addr[4];
- size_t len[4];
-
- os_memset(auth, 0, MD5_MAC_LEN);
- attr = radius_msg_add_attr(msg, RADIUS_ATTR_MESSAGE_AUTHENTICATOR,
- auth, MD5_MAC_LEN);
- if (attr == NULL) {
- printf("WARNING: Could not add Message-Authenticator\n");
- return -1;
- }
- msg->hdr->length = htons(wpabuf_len(msg->buf));
- os_memcpy(msg->hdr->authenticator, req_authenticator,
- sizeof(msg->hdr->authenticator));
- hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
- wpabuf_len(msg->buf), (u8 *) (attr + 1));
-
- /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
- addr[0] = (u8 *) msg->hdr;
- len[0] = 1 + 1 + 2;
- addr[1] = req_authenticator;
- len[1] = MD5_MAC_LEN;
- addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
- len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
- addr[3] = secret;
- len[3] = secret_len;
- md5_vector(4, addr, len, msg->hdr->authenticator);
-
- if (wpabuf_len(msg->buf) > 0xffff) {
- wpa_printf(MSG_WARNING, "RADIUS: Too long message (%lu)",
- (unsigned long) wpabuf_len(msg->buf));
- return -1;
- }
- return 0;
-}
-
-
-void radius_msg_finish_acct(struct radius_msg *msg, const u8 *secret,
- size_t secret_len)
-{
- const u8 *addr[2];
- size_t len[2];
-
- msg->hdr->length = htons(wpabuf_len(msg->buf));
- os_memset(msg->hdr->authenticator, 0, MD5_MAC_LEN);
- addr[0] = wpabuf_head(msg->buf);
- len[0] = wpabuf_len(msg->buf);
- addr[1] = secret;
- len[1] = secret_len;
- md5_vector(2, addr, len, msg->hdr->authenticator);
-
- if (wpabuf_len(msg->buf) > 0xffff) {
- wpa_printf(MSG_WARNING, "RADIUS: Too long messages (%lu)",
- (unsigned long) wpabuf_len(msg->buf));
- }
-}
-
-
-static int radius_msg_add_attr_to_array(struct radius_msg *msg,
- struct radius_attr_hdr *attr)
-{
- if (msg->attr_used >= msg->attr_size) {
- size_t *nattr_pos;
- int nlen = msg->attr_size * 2;
-
- nattr_pos = os_realloc(msg->attr_pos,
- nlen * sizeof(*msg->attr_pos));
- if (nattr_pos == NULL)
- return -1;
-
- msg->attr_pos = nattr_pos;
- msg->attr_size = nlen;
- }
-
- msg->attr_pos[msg->attr_used++] =
- (unsigned char *) attr - wpabuf_head_u8(msg->buf);
-
- return 0;
-}
-
-
-struct radius_attr_hdr *radius_msg_add_attr(struct radius_msg *msg, u8 type,
- const u8 *data, size_t data_len)
-{
- size_t buf_needed;
- struct radius_attr_hdr *attr;
-
- if (data_len > RADIUS_MAX_ATTR_LEN) {
- printf("radius_msg_add_attr: too long attribute (%lu bytes)\n",
- (unsigned long) data_len);
- return NULL;
- }
-
- buf_needed = sizeof(*attr) + data_len;
-
- if (wpabuf_tailroom(msg->buf) < buf_needed) {
- /* allocate more space for message buffer */
- if (wpabuf_resize(&msg->buf, buf_needed) < 0)
- return NULL;
- msg->hdr = wpabuf_mhead(msg->buf);
- }
-
- attr = wpabuf_put(msg->buf, sizeof(struct radius_attr_hdr));
- attr->type = type;
- attr->length = sizeof(*attr) + data_len;
- wpabuf_put_data(msg->buf, data, data_len);
-
- if (radius_msg_add_attr_to_array(msg, attr))
- return NULL;
-
- return attr;
-}
-
-
-/**
- * radius_msg_parse - Parse a RADIUS message
- * @data: RADIUS message to be parsed
- * @len: Length of data buffer in octets
- * Returns: Parsed RADIUS message or %NULL on failure
- *
- * This parses a RADIUS message and makes a copy of its data. The caller is
- * responsible for freeing the returned data with radius_msg_free().
- */
-struct radius_msg * radius_msg_parse(const u8 *data, size_t len)
-{
- struct radius_msg *msg;
- struct radius_hdr *hdr;
- struct radius_attr_hdr *attr;
- size_t msg_len;
- unsigned char *pos, *end;
-
- if (data == NULL || len < sizeof(*hdr))
- return NULL;
-
- hdr = (struct radius_hdr *) data;
-
- msg_len = ntohs(hdr->length);
- if (msg_len < sizeof(*hdr) || msg_len > len) {
- wpa_printf(MSG_INFO, "RADIUS: Invalid message length");
- return NULL;
- }
-
- if (msg_len < len) {
- wpa_printf(MSG_DEBUG, "RADIUS: Ignored %lu extra bytes after "
- "RADIUS message", (unsigned long) len - msg_len);
- }
-
- msg = os_zalloc(sizeof(*msg));
- if (msg == NULL)
- return NULL;
-
- msg->buf = wpabuf_alloc_copy(data, msg_len);
- if (msg->buf == NULL || radius_msg_initialize(msg)) {
- radius_msg_free(msg);
- return NULL;
- }
- msg->hdr = wpabuf_mhead(msg->buf);
-
- /* parse attributes */
- pos = wpabuf_mhead_u8(msg->buf) + sizeof(struct radius_hdr);
- end = wpabuf_mhead_u8(msg->buf) + wpabuf_len(msg->buf);
- while (pos < end) {
- if ((size_t) (end - pos) < sizeof(*attr))
- goto fail;
-
- attr = (struct radius_attr_hdr *) pos;
-
- if (pos + attr->length > end || attr->length < sizeof(*attr))
- goto fail;
-
- /* TODO: check that attr->length is suitable for attr->type */
-
- if (radius_msg_add_attr_to_array(msg, attr))
- goto fail;
-
- pos += attr->length;
- }
-
- return msg;
-
- fail:
- radius_msg_free(msg);
- return NULL;
-}
-
-
-int radius_msg_add_eap(struct radius_msg *msg, const u8 *data, size_t data_len)
-{
- const u8 *pos = data;
- size_t left = data_len;
-
- while (left > 0) {
- int len;
- if (left > RADIUS_MAX_ATTR_LEN)
- len = RADIUS_MAX_ATTR_LEN;
- else
- len = left;
-
- if (!radius_msg_add_attr(msg, RADIUS_ATTR_EAP_MESSAGE,
- pos, len))
- return 0;
-
- pos += len;
- left -= len;
- }
-
- return 1;
-}
-
-
-u8 *radius_msg_get_eap(struct radius_msg *msg, size_t *eap_len)
-{
- u8 *eap, *pos;
- size_t len, i;
- struct radius_attr_hdr *attr;
-
- if (msg == NULL)
- return NULL;
-
- len = 0;
- for (i = 0; i < msg->attr_used; i++) {
- attr = radius_get_attr_hdr(msg, i);
- if (attr->type == RADIUS_ATTR_EAP_MESSAGE)
- len += attr->length - sizeof(struct radius_attr_hdr);
- }
-
- if (len == 0)
- return NULL;
-
- eap = os_malloc(len);
- if (eap == NULL)
- return NULL;
-
- pos = eap;
- for (i = 0; i < msg->attr_used; i++) {
- attr = radius_get_attr_hdr(msg, i);
- if (attr->type == RADIUS_ATTR_EAP_MESSAGE) {
- int flen = attr->length - sizeof(*attr);
- os_memcpy(pos, attr + 1, flen);
- pos += flen;
- }
- }
-
- if (eap_len)
- *eap_len = len;
-
- return eap;
-}
-
-
-int radius_msg_verify_msg_auth(struct radius_msg *msg, const u8 *secret,
- size_t secret_len, const u8 *req_auth)
-{
- u8 auth[MD5_MAC_LEN], orig[MD5_MAC_LEN];
- u8 orig_authenticator[16];
- struct radius_attr_hdr *attr = NULL, *tmp;
- size_t i;
-
- for (i = 0; i < msg->attr_used; i++) {
- tmp = radius_get_attr_hdr(msg, i);
- if (tmp->type == RADIUS_ATTR_MESSAGE_AUTHENTICATOR) {
- if (attr != NULL) {
- printf("Multiple Message-Authenticator "
- "attributes in RADIUS message\n");
- return 1;
- }
- attr = tmp;
- }
- }
-
- if (attr == NULL) {
- printf("No Message-Authenticator attribute found\n");
- return 1;
- }
-
- os_memcpy(orig, attr + 1, MD5_MAC_LEN);
- os_memset(attr + 1, 0, MD5_MAC_LEN);
- if (req_auth) {
- os_memcpy(orig_authenticator, msg->hdr->authenticator,
- sizeof(orig_authenticator));
- os_memcpy(msg->hdr->authenticator, req_auth,
- sizeof(msg->hdr->authenticator));
- }
- hmac_md5(secret, secret_len, wpabuf_head(msg->buf),
- wpabuf_len(msg->buf), auth);
- os_memcpy(attr + 1, orig, MD5_MAC_LEN);
- if (req_auth) {
- os_memcpy(msg->hdr->authenticator, orig_authenticator,
- sizeof(orig_authenticator));
- }
-
- if (os_memcmp(orig, auth, MD5_MAC_LEN) != 0) {
- printf("Invalid Message-Authenticator!\n");
- return 1;
- }
-
- return 0;
-}
-
-
-int radius_msg_verify(struct radius_msg *msg, const u8 *secret,
- size_t secret_len, struct radius_msg *sent_msg, int auth)
-{
- const u8 *addr[4];
- size_t len[4];
- u8 hash[MD5_MAC_LEN];
-
- if (sent_msg == NULL) {
- printf("No matching Access-Request message found\n");
- return 1;
- }
-
- if (auth &&
- radius_msg_verify_msg_auth(msg, secret, secret_len,
- sent_msg->hdr->authenticator)) {
- return 1;
- }
-
- /* ResponseAuth = MD5(Code+ID+Length+RequestAuth+Attributes+Secret) */
- addr[0] = (u8 *) msg->hdr;
- len[0] = 1 + 1 + 2;
- addr[1] = sent_msg->hdr->authenticator;
- len[1] = MD5_MAC_LEN;
- addr[2] = wpabuf_head_u8(msg->buf) + sizeof(struct radius_hdr);
- len[2] = wpabuf_len(msg->buf) - sizeof(struct radius_hdr);
- addr[3] = secret;
- len[3] = secret_len;
- md5_vector(4, addr, len, hash);
- if (os_memcmp(hash, msg->hdr->authenticator, MD5_MAC_LEN) != 0) {
- printf("Response Authenticator invalid!\n");
- return 1;
- }
-
- return 0;
-}
-
-
-int radius_msg_copy_attr(struct radius_msg *dst, struct radius_msg *src,
- u8 type)
-{
- struct radius_attr_hdr *attr;
- size_t i;
- int count = 0;
-
- for (i = 0; i < src->attr_used; i++) {
- attr = radius_get_attr_hdr(src, i);
- if (attr->type == type) {
- if (!radius_msg_add_attr(dst, type, (u8 *) (attr + 1),
- attr->length - sizeof(*attr)))
- return -1;
- count++;
- }
- }
-
- return count;
-}
-
-
-/* Create Request Authenticator. The value should be unique over the lifetime
- * of the shared secret between authenticator and authentication server.
- * Use one-way MD5 hash calculated from current timestamp and some data given
- * by the caller. */
-void radius_msg_make_authenticator(struct radius_msg *msg,
- const u8 *data, size_t len)
-{
- struct os_time tv;
- long int l;
- const u8 *addr[3];
- size_t elen[3];
-
- os_get_time(&tv);
- l = os_random();
- addr[0] = (u8 *) &tv;
- elen[0] = sizeof(tv);
- addr[1] = data;
- elen[1] = len;
- addr[2] = (u8 *) &l;
- elen[2] = sizeof(l);
- md5_vector(3, addr, elen, msg->hdr->authenticator);
-}
-
-
-/* Get Vendor-specific RADIUS Attribute from a parsed RADIUS message.
- * Returns the Attribute payload and sets alen to indicate the length of the
- * payload if a vendor attribute with subtype is found, otherwise returns NULL.
- * The returned payload is allocated with os_malloc() and caller must free it
- * by calling os_free().
- */
-static u8 *radius_msg_get_vendor_attr(struct radius_msg *msg, u32 vendor,
- u8 subtype, size_t *alen)
-{
- u8 *data, *pos;
- size_t i, len;
-
- if (msg == NULL)
- return NULL;
-
- for (i = 0; i < msg->attr_used; i++) {
- struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
- size_t left;
- u32 vendor_id;
- struct radius_attr_vendor *vhdr;
-
- if (attr->type != RADIUS_ATTR_VENDOR_SPECIFIC)
- continue;
-
- left = attr->length - sizeof(*attr);
- if (left < 4)
- continue;
-
- pos = (u8 *) (attr + 1);
-
- os_memcpy(&vendor_id, pos, 4);
- pos += 4;
- left -= 4;
-
- if (ntohl(vendor_id) != vendor)
- continue;
-
- while (left >= sizeof(*vhdr)) {
- vhdr = (struct radius_attr_vendor *) pos;
- if (vhdr->vendor_length > left ||
- vhdr->vendor_length < sizeof(*vhdr)) {
- left = 0;
- break;
- }
- if (vhdr->vendor_type != subtype) {
- pos += vhdr->vendor_length;
- left -= vhdr->vendor_length;
- continue;
- }
-
- len = vhdr->vendor_length - sizeof(*vhdr);
- data = os_malloc(len);
- if (data == NULL)
- return NULL;
- os_memcpy(data, pos + sizeof(*vhdr), len);
- if (alen)
- *alen = len;
- return data;
- }
- }
-
- return NULL;
-}
-
-
-static u8 * decrypt_ms_key(const u8 *key, size_t len,
- const u8 *req_authenticator,
- const u8 *secret, size_t secret_len, size_t *reslen)
-{
- u8 *plain, *ppos, *res;
- const u8 *pos;
- size_t left, plen;
- u8 hash[MD5_MAC_LEN];
- int i, first = 1;
- const u8 *addr[3];
- size_t elen[3];
-
- /* key: 16-bit salt followed by encrypted key info */
-
- if (len < 2 + 16)
- return NULL;
-
- pos = key + 2;
- left = len - 2;
- if (left % 16) {
- printf("Invalid ms key len %lu\n", (unsigned long) left);
- return NULL;
- }
-
- plen = left;
- ppos = plain = os_malloc(plen);
- if (plain == NULL)
- return NULL;
- plain[0] = 0;
-
- while (left > 0) {
- /* b(1) = MD5(Secret + Request-Authenticator + Salt)
- * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
-
- addr[0] = secret;
- elen[0] = secret_len;
- if (first) {
- addr[1] = req_authenticator;
- elen[1] = MD5_MAC_LEN;
- addr[2] = key;
- elen[2] = 2; /* Salt */
- } else {
- addr[1] = pos - MD5_MAC_LEN;
- elen[1] = MD5_MAC_LEN;
- }
- md5_vector(first ? 3 : 2, addr, elen, hash);
- first = 0;
-
- for (i = 0; i < MD5_MAC_LEN; i++)
- *ppos++ = *pos++ ^ hash[i];
- left -= MD5_MAC_LEN;
- }
-
- if (plain[0] == 0 || plain[0] > plen - 1) {
- printf("Failed to decrypt MPPE key\n");
- os_free(plain);
- return NULL;
- }
-
- res = os_malloc(plain[0]);
- if (res == NULL) {
- os_free(plain);
- return NULL;
- }
- os_memcpy(res, plain + 1, plain[0]);
- if (reslen)
- *reslen = plain[0];
- os_free(plain);
- return res;
-}
-
-
-static void encrypt_ms_key(const u8 *key, size_t key_len, u16 salt,
- const u8 *req_authenticator,
- const u8 *secret, size_t secret_len,
- u8 *ebuf, size_t *elen)
-{
- int i, len, first = 1;
- u8 hash[MD5_MAC_LEN], saltbuf[2], *pos;
- const u8 *addr[3];
- size_t _len[3];
-
- WPA_PUT_BE16(saltbuf, salt);
-
- len = 1 + key_len;
- if (len & 0x0f) {
- len = (len & 0xf0) + 16;
- }
- os_memset(ebuf, 0, len);
- ebuf[0] = key_len;
- os_memcpy(ebuf + 1, key, key_len);
-
- *elen = len;
-
- pos = ebuf;
- while (len > 0) {
- /* b(1) = MD5(Secret + Request-Authenticator + Salt)
- * b(i) = MD5(Secret + c(i - 1)) for i > 1 */
- addr[0] = secret;
- _len[0] = secret_len;
- if (first) {
- addr[1] = req_authenticator;
- _len[1] = MD5_MAC_LEN;
- addr[2] = saltbuf;
- _len[2] = sizeof(saltbuf);
- } else {
- addr[1] = pos - MD5_MAC_LEN;
- _len[1] = MD5_MAC_LEN;
- }
- md5_vector(first ? 3 : 2, addr, _len, hash);
- first = 0;
-
- for (i = 0; i < MD5_MAC_LEN; i++)
- *pos++ ^= hash[i];
-
- len -= MD5_MAC_LEN;
- }
-}
-
-
-struct radius_ms_mppe_keys *
-radius_msg_get_ms_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
- const u8 *secret, size_t secret_len)
-{
- u8 *key;
- size_t keylen;
- struct radius_ms_mppe_keys *keys;
-
- if (msg == NULL || sent_msg == NULL)
- return NULL;
-
- keys = os_zalloc(sizeof(*keys));
- if (keys == NULL)
- return NULL;
-
- key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
- RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY,
- &keylen);
- if (key) {
- keys->send = decrypt_ms_key(key, keylen,
- sent_msg->hdr->authenticator,
- secret, secret_len,
- &keys->send_len);
- os_free(key);
- }
-
- key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_MICROSOFT,
- RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY,
- &keylen);
- if (key) {
- keys->recv = decrypt_ms_key(key, keylen,
- sent_msg->hdr->authenticator,
- secret, secret_len,
- &keys->recv_len);
- os_free(key);
- }
-
- return keys;
-}
-
-
-struct radius_ms_mppe_keys *
-radius_msg_get_cisco_keys(struct radius_msg *msg, struct radius_msg *sent_msg,
- const u8 *secret, size_t secret_len)
-{
- u8 *key;
- size_t keylen;
- struct radius_ms_mppe_keys *keys;
-
- if (msg == NULL || sent_msg == NULL)
- return NULL;
-
- keys = os_zalloc(sizeof(*keys));
- if (keys == NULL)
- return NULL;
-
- key = radius_msg_get_vendor_attr(msg, RADIUS_VENDOR_ID_CISCO,
- RADIUS_CISCO_AV_PAIR, &keylen);
- if (key && keylen == 51 &&
- os_memcmp(key, "leap:session-key=", 17) == 0) {
- keys->recv = decrypt_ms_key(key + 17, keylen - 17,
- sent_msg->hdr->authenticator,
- secret, secret_len,
- &keys->recv_len);
- }
- os_free(key);
-
- return keys;
-}
-
-
-int radius_msg_add_mppe_keys(struct radius_msg *msg,
- const u8 *req_authenticator,
- const u8 *secret, size_t secret_len,
- const u8 *send_key, size_t send_key_len,
- const u8 *recv_key, size_t recv_key_len)
-{
- struct radius_attr_hdr *attr;
- u32 vendor_id = htonl(RADIUS_VENDOR_ID_MICROSOFT);
- u8 *buf;
- struct radius_attr_vendor *vhdr;
- u8 *pos;
- size_t elen;
- int hlen;
- u16 salt;
-
- hlen = sizeof(vendor_id) + sizeof(*vhdr) + 2;
-
- /* MS-MPPE-Send-Key */
- buf = os_malloc(hlen + send_key_len + 16);
- if (buf == NULL) {
- return 0;
- }
- pos = buf;
- os_memcpy(pos, &vendor_id, sizeof(vendor_id));
- pos += sizeof(vendor_id);
- vhdr = (struct radius_attr_vendor *) pos;
- vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY;
- pos = (u8 *) (vhdr + 1);
- salt = os_random() | 0x8000;
- WPA_PUT_BE16(pos, salt);
- pos += 2;
- encrypt_ms_key(send_key, send_key_len, salt, req_authenticator, secret,
- secret_len, pos, &elen);
- vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
-
- attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
- buf, hlen + elen);
- os_free(buf);
- if (attr == NULL) {
- return 0;
- }
-
- /* MS-MPPE-Recv-Key */
- buf = os_malloc(hlen + send_key_len + 16);
- if (buf == NULL) {
- return 0;
- }
- pos = buf;
- os_memcpy(pos, &vendor_id, sizeof(vendor_id));
- pos += sizeof(vendor_id);
- vhdr = (struct radius_attr_vendor *) pos;
- vhdr->vendor_type = RADIUS_VENDOR_ATTR_MS_MPPE_RECV_KEY;
- pos = (u8 *) (vhdr + 1);
- salt ^= 1;
- WPA_PUT_BE16(pos, salt);
- pos += 2;
- encrypt_ms_key(recv_key, recv_key_len, salt, req_authenticator, secret,
- secret_len, pos, &elen);
- vhdr->vendor_length = hlen + elen - sizeof(vendor_id);
-
- attr = radius_msg_add_attr(msg, RADIUS_ATTR_VENDOR_SPECIFIC,
- buf, hlen + elen);
- os_free(buf);
- if (attr == NULL) {
- return 0;
- }
-
- return 1;
-}
-
-
-/* Add User-Password attribute to a RADIUS message and encrypt it as specified
- * in RFC 2865, Chap. 5.2 */
-struct radius_attr_hdr *
-radius_msg_add_attr_user_password(struct radius_msg *msg,
- const u8 *data, size_t data_len,
- const u8 *secret, size_t secret_len)
-{
- u8 buf[128];
- int padlen, i;
- size_t buf_len, pos;
- const u8 *addr[2];
- size_t len[2];
- u8 hash[16];
-
- if (data_len > 128)
- return NULL;
-
- os_memcpy(buf, data, data_len);
- buf_len = data_len;
-
- padlen = data_len % 16;
- if (padlen) {
- padlen = 16 - padlen;
- os_memset(buf + data_len, 0, padlen);
- buf_len += padlen;
- }
-
- addr[0] = secret;
- len[0] = secret_len;
- addr[1] = msg->hdr->authenticator;
- len[1] = 16;
- md5_vector(2, addr, len, hash);
-
- for (i = 0; i < 16; i++)
- buf[i] ^= hash[i];
- pos = 16;
-
- while (pos < buf_len) {
- addr[0] = secret;
- len[0] = secret_len;
- addr[1] = &buf[pos - 16];
- len[1] = 16;
- md5_vector(2, addr, len, hash);
-
- for (i = 0; i < 16; i++)
- buf[pos + i] ^= hash[i];
-
- pos += 16;
- }
-
- return radius_msg_add_attr(msg, RADIUS_ATTR_USER_PASSWORD,
- buf, buf_len);
-}
-
-
-int radius_msg_get_attr(struct radius_msg *msg, u8 type, u8 *buf, size_t len)
-{
- struct radius_attr_hdr *attr = NULL, *tmp;
- size_t i, dlen;
-
- for (i = 0; i < msg->attr_used; i++) {
- tmp = radius_get_attr_hdr(msg, i);
- if (tmp->type == type) {
- attr = tmp;
- break;
- }
- }
-
- if (!attr)
- return -1;
-
- dlen = attr->length - sizeof(*attr);
- if (buf)
- os_memcpy(buf, (attr + 1), dlen > len ? len : dlen);
- return dlen;
-}
-
-
-int radius_msg_get_attr_ptr(struct radius_msg *msg, u8 type, u8 **buf,
- size_t *len, const u8 *start)
-{
- size_t i;
- struct radius_attr_hdr *attr = NULL, *tmp;
-
- for (i = 0; i < msg->attr_used; i++) {
- tmp = radius_get_attr_hdr(msg, i);
- if (tmp->type == type &&
- (start == NULL || (u8 *) tmp > start)) {
- attr = tmp;
- break;
- }
- }
-
- if (!attr)
- return -1;
-
- *buf = (u8 *) (attr + 1);
- *len = attr->length - sizeof(*attr);
- return 0;
-}
-
-
-int radius_msg_count_attr(struct radius_msg *msg, u8 type, int min_len)
-{
- size_t i;
- int count;
-
- for (count = 0, i = 0; i < msg->attr_used; i++) {
- struct radius_attr_hdr *attr = radius_get_attr_hdr(msg, i);
- if (attr->type == type &&
- attr->length >= sizeof(struct radius_attr_hdr) + min_len)
- count++;
- }
-
- return count;
-}
-
-
-struct radius_tunnel_attrs {
- int tag_used;
- int type; /* Tunnel-Type */
- int medium_type; /* Tunnel-Medium-Type */
- int vlanid;
-};
-
-
-/**
- * radius_msg_get_vlanid - Parse RADIUS attributes for VLAN tunnel information
- * @msg: RADIUS message
- * Returns: VLAN ID for the first tunnel configuration of -1 if none is found
- */
-int radius_msg_get_vlanid(struct radius_msg *msg)
-{
- struct radius_tunnel_attrs tunnel[RADIUS_TUNNEL_TAGS], *tun;
- size_t i;
- struct radius_attr_hdr *attr = NULL;
- const u8 *data;
- char buf[10];
- size_t dlen;
-
- os_memset(&tunnel, 0, sizeof(tunnel));
-
- for (i = 0; i < msg->attr_used; i++) {
- attr = radius_get_attr_hdr(msg, i);
- data = (const u8 *) (attr + 1);
- dlen = attr->length - sizeof(*attr);
- if (attr->length < 3)
- continue;
- if (data[0] >= RADIUS_TUNNEL_TAGS)
- tun = &tunnel[0];
- else
- tun = &tunnel[data[0]];
-
- switch (attr->type) {
- case RADIUS_ATTR_TUNNEL_TYPE:
- if (attr->length != 6)
- break;
- tun->tag_used++;
- tun->type = WPA_GET_BE24(data + 1);
- break;
- case RADIUS_ATTR_TUNNEL_MEDIUM_TYPE:
- if (attr->length != 6)
- break;
- tun->tag_used++;
- tun->medium_type = WPA_GET_BE24(data + 1);
- break;
- case RADIUS_ATTR_TUNNEL_PRIVATE_GROUP_ID:
- if (data[0] < RADIUS_TUNNEL_TAGS) {
- data++;
- dlen--;
- }
- if (dlen >= sizeof(buf))
- break;
- os_memcpy(buf, data, dlen);
- buf[dlen] = '\0';
- tun->tag_used++;
- tun->vlanid = atoi(buf);
- break;
- }
- }
-
- for (i = 0; i < RADIUS_TUNNEL_TAGS; i++) {
- tun = &tunnel[i];
- if (tun->tag_used &&
- tun->type == RADIUS_TUNNEL_TYPE_VLAN &&
- tun->medium_type == RADIUS_TUNNEL_MEDIUM_TYPE_802 &&
- tun->vlanid > 0)
- return tun->vlanid;
- }
-
- return -1;
-}
-
-
-void radius_free_class(struct radius_class_data *c)
-{
- size_t i;
- if (c == NULL)
- return;
- for (i = 0; i < c->count; i++)
- os_free(c->attr[i].data);
- os_free(c->attr);
- c->attr = NULL;
- c->count = 0;
-}
-
-
-int radius_copy_class(struct radius_class_data *dst,
- const struct radius_class_data *src)
-{
- size_t i;
-
- if (src->attr == NULL)
- return 0;
-
- dst->attr = os_zalloc(src->count * sizeof(struct radius_attr_data));
- if (dst->attr == NULL)
- return -1;
-
- dst->count = 0;
-
- for (i = 0; i < src->count; i++) {
- dst->attr[i].data = os_malloc(src->attr[i].len);
- if (dst->attr[i].data == NULL)
- break;
- dst->count++;
- os_memcpy(dst->attr[i].data, src->attr[i].data,
- src->attr[i].len);
- dst->attr[i].len = src->attr[i].len;
- }
-
- return 0;
-}
projects / mech_eap.git / blobdiff