183d3924cf
If the uuid configuration parameter is not set, wpa_supplicant generates an UUID automatically to allow WPS operations to proceed. This was previously always using an UUID generated from the MAC address. This commit adds an option to use a random UUID instead. The type of the automatically generated UUID is set with the auto_uuid parameter: 0 = based on MAC address (default; old behavior), 1 = random UUID. Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
96 lines
1.8 KiB
C
96 lines
1.8 KiB
C
/*
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* Universally Unique IDentifier (UUID)
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* Copyright (c) 2008, Jouni Malinen <j@w1.fi>
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#include "includes.h"
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#include "common.h"
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#include "crypto/sha256.h"
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#include "uuid.h"
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int uuid_str2bin(const char *str, u8 *bin)
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{
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const char *pos;
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u8 *opos;
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pos = str;
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opos = bin;
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if (hexstr2bin(pos, opos, 4))
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return -1;
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pos += 8;
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opos += 4;
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if (*pos++ != '-' || hexstr2bin(pos, opos, 2))
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return -1;
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pos += 4;
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opos += 2;
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if (*pos++ != '-' || hexstr2bin(pos, opos, 2))
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return -1;
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pos += 4;
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opos += 2;
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if (*pos++ != '-' || hexstr2bin(pos, opos, 2))
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return -1;
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pos += 4;
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opos += 2;
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if (*pos++ != '-' || hexstr2bin(pos, opos, 6))
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return -1;
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return 0;
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}
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int uuid_bin2str(const u8 *bin, char *str, size_t max_len)
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{
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int len;
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len = os_snprintf(str, max_len, "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
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"%02x%02x-%02x%02x%02x%02x%02x%02x",
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bin[0], bin[1], bin[2], bin[3],
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bin[4], bin[5], bin[6], bin[7],
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bin[8], bin[9], bin[10], bin[11],
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bin[12], bin[13], bin[14], bin[15]);
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if (os_snprintf_error(max_len, len))
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return -1;
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return 0;
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}
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int is_nil_uuid(const u8 *uuid)
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{
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int i;
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for (i = 0; i < UUID_LEN; i++)
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if (uuid[i])
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return 0;
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return 1;
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}
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int uuid_random(u8 *uuid)
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{
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struct os_time t;
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u8 hash[SHA256_MAC_LEN];
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/* Use HMAC-SHA256 and timestamp as context to avoid exposing direct
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* os_get_random() output in the UUID field. */
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os_get_time(&t);
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if (os_get_random(uuid, UUID_LEN) < 0 ||
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hmac_sha256(uuid, UUID_LEN, (const u8 *) &t, sizeof(t), hash) < 0)
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return -1;
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os_memcpy(uuid, hash, UUID_LEN);
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/* Version: 4 = random */
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uuid[6] = (4 << 4) | (uuid[6] & 0x0f);
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/* Variant specified in RFC 4122 */
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uuid[8] = 0x80 | (uuid[8] & 0x3f);
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return 0;
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}
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