| /* |
| * 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; |
| } |