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-rw-r--r--src/crypto/ms_funcs.c128
1 files changed, 89 insertions, 39 deletions
diff --git a/src/crypto/ms_funcs.c b/src/crypto/ms_funcs.c
index dae15ab915fe7..b2bbab2b5c320 100644
--- a/src/crypto/ms_funcs.c
+++ b/src/crypto/ms_funcs.c
@@ -1,15 +1,9 @@
/*
* WPA Supplicant / shared MSCHAPV2 helper functions / RFC 2433 / RFC 2759
- * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2004-2012, 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 software may be distributed under the terms of the BSD license.
+ * See README for more details.
*/
#include "includes.h"
@@ -19,6 +13,60 @@
#include "ms_funcs.h"
#include "crypto.h"
+/**
+ * utf8_to_ucs2 - Convert UTF-8 string to UCS-2 encoding
+ * @utf8_string: UTF-8 string (IN)
+ * @utf8_string_len: Length of utf8_string (IN)
+ * @ucs2_buffer: UCS-2 buffer (OUT)
+ * @ucs2_buffer_size: Length of UCS-2 buffer (IN)
+ * @ucs2_string_size: Number of 2-byte words in the resulting UCS-2 string
+ * Returns: 0 on success, -1 on failure
+ */
+static int utf8_to_ucs2(const u8 *utf8_string, size_t utf8_string_len,
+ u8 *ucs2_buffer, size_t ucs2_buffer_size,
+ size_t *ucs2_string_size)
+{
+ size_t i, j;
+
+ for (i = 0, j = 0; i < utf8_string_len; i++) {
+ u8 c = utf8_string[i];
+ if (j >= ucs2_buffer_size) {
+ /* input too long */
+ return -1;
+ }
+ if (c <= 0x7F) {
+ WPA_PUT_LE16(ucs2_buffer + j, c);
+ j += 2;
+ } else if (i == utf8_string_len - 1 ||
+ j >= ucs2_buffer_size - 1) {
+ /* incomplete surrogate */
+ return -1;
+ } else {
+ u8 c2 = utf8_string[++i];
+ if ((c & 0xE0) == 0xC0) {
+ /* two-byte encoding */
+ WPA_PUT_LE16(ucs2_buffer + j,
+ ((c & 0x1F) << 6) | (c2 & 0x3F));
+ j += 2;
+ } else if (i == utf8_string_len ||
+ j >= ucs2_buffer_size - 1) {
+ /* incomplete surrogate */
+ return -1;
+ } else {
+ /* three-byte encoding */
+ u8 c3 = utf8_string[++i];
+ WPA_PUT_LE16(ucs2_buffer + j,
+ ((c & 0xF) << 12) |
+ ((c2 & 0x3F) << 6) | (c3 & 0x3F));
+ }
+ }
+ }
+
+ if (ucs2_string_size)
+ *ucs2_string_size = j / 2;
+ return 0;
+}
+
/**
* challenge_hash - ChallengeHash() - RFC 2759, Sect. 8.2
@@ -53,7 +101,7 @@ static int challenge_hash(const u8 *peer_challenge, const u8 *auth_challenge,
/**
* nt_password_hash - NtPasswordHash() - RFC 2759, Sect. 8.3
- * @password: 0-to-256-unicode-char Password (IN; ASCII)
+ * @password: 0-to-256-unicode-char Password (IN; UTF-8)
* @password_len: Length of password
* @password_hash: 16-octet PasswordHash (OUT)
* Returns: 0 on success, -1 on failure
@@ -62,18 +110,13 @@ int nt_password_hash(const u8 *password, size_t password_len,
u8 *password_hash)
{
u8 buf[512], *pos;
- size_t i, len;
+ size_t len, max_len;
- if (password_len > 256)
- password_len = 256;
-
- /* Convert password into unicode */
- for (i = 0; i < password_len; i++) {
- buf[2 * i] = password[i];
- buf[2 * i + 1] = 0;
- }
+ max_len = sizeof(buf);
+ if (utf8_to_ucs2(password, password_len, buf, max_len, &len) < 0)
+ return -1;
- len = password_len * 2;
+ len *= 2;
pos = buf;
return md4_vector(1, (const u8 **) &pos, &len, password_hash);
}
@@ -117,7 +160,7 @@ void challenge_response(const u8 *challenge, const u8 *password_hash,
* @peer_challenge: 16-octet PeerChallenge (IN)
* @username: 0-to-256-char UserName (IN)
* @username_len: Length of username
- * @password: 0-to-256-unicode-char Password (IN; ASCII)
+ * @password: 0-to-256-unicode-char Password (IN; UTF-8)
* @password_len: Length of password
* @response: 24-octet Response (OUT)
* Returns: 0 on success, -1 on failure
@@ -130,8 +173,9 @@ int generate_nt_response(const u8 *auth_challenge, const u8 *peer_challenge,
u8 challenge[8];
u8 password_hash[16];
- challenge_hash(peer_challenge, auth_challenge, username, username_len,
- challenge);
+ if (challenge_hash(peer_challenge, auth_challenge, username,
+ username_len, challenge))
+ return -1;
if (nt_password_hash(password, password_len, password_hash))
return -1;
challenge_response(challenge, password_hash, response);
@@ -217,15 +261,16 @@ int generate_authenticator_response_pwhash(
if (sha1_vector(3, addr1, len1, response))
return -1;
- challenge_hash(peer_challenge, auth_challenge, username, username_len,
- challenge);
+ if (challenge_hash(peer_challenge, auth_challenge, username,
+ username_len, challenge))
+ return -1;
return sha1_vector(3, addr2, len2, response);
}
/**
* generate_authenticator_response - GenerateAuthenticatorResponse() - RFC 2759, Sect. 8.7
- * @password: 0-to-256-unicode-char Password (IN; ASCII)
+ * @password: 0-to-256-unicode-char Password (IN; UTF-8)
* @password_len: Length of password
* @nt_response: 24-octet NT-Response (IN)
* @peer_challenge: 16-octet PeerChallenge (IN)
@@ -254,7 +299,7 @@ int generate_authenticator_response(const u8 *password, size_t password_len,
/**
* nt_challenge_response - NtChallengeResponse() - RFC 2433, Sect. A.5
* @challenge: 8-octet Challenge (IN)
- * @password: 0-to-256-unicode-char Password (IN; ASCII)
+ * @password: 0-to-256-unicode-char Password (IN; UTF-8)
* @password_len: Length of password
* @response: 24-octet Response (OUT)
* Returns: 0 on success, -1 on failure
@@ -375,7 +420,7 @@ int get_asymetric_start_key(const u8 *master_key, u8 *session_key,
/**
* encrypt_pw_block_with_password_hash - EncryptPwBlockWithPasswordHash() - RFC 2759, Sect. 8.10
- * @password: 0-to-256-unicode-char Password (IN; ASCII)
+ * @password: 0-to-256-unicode-char Password (IN; UTF-8)
* @password_len: Length of password
* @password_hash: 16-octet PasswordHash (IN)
* @pw_block: 516-byte PwBlock (OUT)
@@ -385,18 +430,23 @@ int encrypt_pw_block_with_password_hash(
const u8 *password, size_t password_len,
const u8 *password_hash, u8 *pw_block)
{
- size_t i, offset;
+ size_t ucs2_len, offset;
u8 *pos;
- if (password_len > 256)
+ os_memset(pw_block, 0, PWBLOCK_LEN);
+
+ if (utf8_to_ucs2(password, password_len, pw_block, 512, &ucs2_len) < 0)
return -1;
- os_memset(pw_block, 0, PWBLOCK_LEN);
- offset = (256 - password_len) * 2;
- if (os_get_random(pw_block, offset) < 0)
+ if (ucs2_len > 256)
return -1;
- for (i = 0; i < password_len; i++)
- pw_block[offset + i * 2] = password[i];
+
+ offset = (256 - ucs2_len) * 2;
+ if (offset != 0) {
+ os_memmove(pw_block + offset, pw_block, ucs2_len * 2);
+ if (os_get_random(pw_block, offset) < 0)
+ return -1;
+ }
/*
* PasswordLength is 4 octets, but since the maximum password length is
* 256, only first two (in little endian byte order) can be non-zero.
@@ -410,9 +460,9 @@ int encrypt_pw_block_with_password_hash(
/**
* new_password_encrypted_with_old_nt_password_hash - NewPasswordEncryptedWithOldNtPasswordHash() - RFC 2759, Sect. 8.9
- * @new_password: 0-to-256-unicode-char NewPassword (IN; ASCII)
+ * @new_password: 0-to-256-unicode-char NewPassword (IN; UTF-8)
* @new_password_len: Length of new_password
- * @old_password: 0-to-256-unicode-char OldPassword (IN; ASCII)
+ * @old_password: 0-to-256-unicode-char OldPassword (IN; UTF-8)
* @old_password_len: Length of old_password
* @encrypted_pw_block: 516-octet EncryptedPwBlock (OUT)
* Returns: 0 on success, -1 on failure
@@ -450,9 +500,9 @@ void nt_password_hash_encrypted_with_block(const u8 *password_hash,
/**
* old_nt_password_hash_encrypted_with_new_nt_password_hash - OldNtPasswordHashEncryptedWithNewNtPasswordHash() - RFC 2759, Sect. 8.12
- * @new_password: 0-to-256-unicode-char NewPassword (IN; ASCII)
+ * @new_password: 0-to-256-unicode-char NewPassword (IN; UTF-8)
* @new_password_len: Length of new_password
- * @old_password: 0-to-256-unicode-char OldPassword (IN; ASCII)
+ * @old_password: 0-to-256-unicode-char OldPassword (IN; UTF-8)
* @old_password_len: Length of old_password
* @encrypted_password_hash: 16-octet EncryptedPasswordHash (OUT)
* Returns: 0 on success, -1 on failure
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-22 11:16:20 +0000