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ie: Provide a utility to build WPA IE

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Build WPA IE based on vendor specific data.
This commit is contained in:
Ravi kumar Veeramally 2015-03-16 13:03:02 +02:00 committed by Denis Kenzior
parent 50c7346d19
commit b9007cbc9a
2 changed files with 128 additions and 25 deletions
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152
src/ie.c
View File

@ -512,37 +512,40 @@ int ie_parse_rsne_from_data(const uint8_t *data, size_t len,
return ie_parse_rsne(&iter, info);
}
/* 802.11, Section 8.4.2.27.2 */
static bool ie_build_cipher_suite(uint8_t *data,
/*
* 802.11, Section 8.4.2.27.2
* 802.11i, Section 7.3.2.25.1 and WPA_80211_v3_1 Section 2.1
*/
static bool ie_build_cipher_suite(uint8_t *data, const uint8_t *oui,
const enum ie_rsn_cipher_suite suite)
{
switch (suite) {
case IE_RSN_CIPHER_SUITE_USE_GROUP_CIPHER:
memcpy(data, ieee_oui, 3);
memcpy(data, oui, 3);
data[3] = 0;
return true;
case IE_RSN_CIPHER_SUITE_WEP40:
memcpy(data, ieee_oui, 3);
memcpy(data, oui, 3);
data[3] = 1;
return true;
case IE_RSN_CIPHER_SUITE_TKIP:
memcpy(data, ieee_oui, 3);
memcpy(data, oui, 3);
data[3] = 2;
return true;
case IE_RSN_CIPHER_SUITE_CCMP:
memcpy(data, ieee_oui, 3);
memcpy(data, oui, 3);
data[3] = 4;
return true;
case IE_RSN_CIPHER_SUITE_WEP104:
memcpy(data, ieee_oui, 3);
memcpy(data, oui, 3);
data[3] = 5;
return true;
case IE_RSN_CIPHER_SUITE_BIP:
memcpy(data, ieee_oui, 3);
memcpy(data, oui, 3);
data[3] = 6;
return true;
case IE_RSN_CIPHER_SUITE_NO_GROUP_TRAFFIC:
memcpy(data, ieee_oui, 3);
memcpy(data, oui, 3);
data[3] = 7;
return true;
}
@ -550,46 +553,48 @@ static bool ie_build_cipher_suite(uint8_t *data,
return false;
}
/* 802.11, Section 8.4.2.27.2 */
static bool ie_build_akm_suite(uint8_t *data,
/*
* 802.11, Section 8.4.2.27.2
* 802.11i, Section 7.3.2.25.2 and WPA_80211_v3_1 Section 2.1
*/
static bool ie_build_akm_suite(uint8_t *data, const uint8_t *oui,
enum ie_rsn_akm_suite suite)
{
switch (suite) {
case IE_RSN_AKM_SUITE_8021X:
memcpy(data, ieee_oui, 3);
memcpy(data, oui, 3);
data[3] = 1;
return true;
case IE_RSN_AKM_SUITE_PSK:
memcpy(data, ieee_oui, 3);
memcpy(data, oui, 3);
data[3] = 2;
return true;
case IE_RSN_AKM_SUITE_FT_OVER_8021X:
memcpy(data, ieee_oui, 3);
memcpy(data, oui, 3);
data[3] = 3;
return true;
case IE_RSN_AKM_SUITE_FT_USING_PSK:
memcpy(data, ieee_oui, 3);
memcpy(data, oui, 3);
data[3] = 4;
return true;
case IE_RSN_AKM_SUITE_8021X_SHA256:
memcpy(data, ieee_oui, 3);
memcpy(data, oui, 3);
data[3] = 5;
return true;
case IE_RSN_AKM_SUITE_PSK_SHA256:
memcpy(data, ieee_oui, 3);
memcpy(data, oui, 3);
data[3] = 6;
return true;
case IE_RSN_AKM_SUITE_TDLS:
memcpy(data, ieee_oui, 3);
memcpy(data, oui, 3);
data[3] = 7;
return true;
case IE_RSN_AKM_SUITE_SAE_SHA256:
memcpy(data, ieee_oui, 3);
memcpy(data, oui, 3);
data[3] = 8;
return true;
case IE_RSN_AKM_SUITE_FT_OVER_SAE_SHA256:
memcpy(data, ieee_oui, 3);
memcpy(data, oui, 3);
data[3] = 9;
return true;
}
@ -629,7 +634,7 @@ bool ie_build_rsne(const struct ie_rsn_info *info, uint8_t *to)
pos += 2;
/* Group Data Cipher Suite */
if (!ie_build_cipher_suite(to + pos, info->group_cipher))
if (!ie_build_cipher_suite(to + pos, ieee_oui, info->group_cipher))
return false;
pos += 4;
@ -647,7 +652,7 @@ bool ie_build_rsne(const struct ie_rsn_info *info, uint8_t *to)
if (pos + 4 > 242)
return false;
if (!ie_build_cipher_suite(to + pos, suite))
if (!ie_build_cipher_suite(to + pos, ieee_oui, suite))
return false;
pos += 4;
@ -672,7 +677,7 @@ bool ie_build_rsne(const struct ie_rsn_info *info, uint8_t *to)
if (pos + 4 > 248)
return false;
if (!ie_build_akm_suite(to + pos, akm_suite))
if (!ie_build_akm_suite(to + pos, ieee_oui, akm_suite))
return false;
pos += 4;
@ -752,7 +757,7 @@ bool ie_build_rsne(const struct ie_rsn_info *info, uint8_t *to)
goto done;
/* Group Management Cipher Suite */
if (!ie_build_cipher_suite(to, info->group_management_cipher))
if (!ie_build_cipher_suite(to, ieee_oui, info->group_management_cipher))
return false;
pos += 4;
@ -1001,3 +1006,100 @@ int ie_parse_wpa_from_data(const uint8_t *data, size_t len,
return ie_parse_wpa(&iter, info);
}
/*
* Generate an WPA IE based on the information found in info.
* The to array must be minimum of 19 bytes in size
*/
bool ie_build_wpa(const struct ie_rsn_info *info, uint8_t *to)
{
/* These are the only valid pairwise suites */
static enum ie_rsn_cipher_suite pairwise_suites[] = {
IE_RSN_CIPHER_SUITE_CCMP,
IE_RSN_CIPHER_SUITE_TKIP,
IE_RSN_CIPHER_SUITE_WEP104,
IE_RSN_CIPHER_SUITE_WEP40,
/* TODO: not sure about USE_GROUP_CIPHER,*/
};
/* These are the only valid AKM suites */
static enum ie_rsn_akm_suite akm_suites[] = {
IE_RSN_AKM_SUITE_8021X,
IE_RSN_AKM_SUITE_PSK,
};
unsigned int pos;
unsigned int i;
uint8_t *countptr;
uint16_t count;
/*
* 802.11i, Section 7.3.2.25.1
* Use of CCMP as the group cipher suite with TKIP as the
* pairwise cipher suite shall not be supported.
*/
if (info->group_cipher & IE_RSN_CIPHER_SUITE_CCMP &&
info->pairwise_ciphers & IE_RSN_CIPHER_SUITE_TKIP)
return false;
to[0] = IE_TYPE_VENDOR_SPECIFIC;
/* Vendor OUI and Type */
pos = 2;
memcpy(to + pos, microsoft_oui, 3);
pos += 3;
to[pos] = 1; /* OUI type 1 means WPA element */
pos++;
/* Version field, always 1 */
l_put_le16(1, to + pos);
pos += 2;
/* Group Data Cipher Suite */
if (!ie_build_cipher_suite(to + pos, microsoft_oui,
info->group_cipher))
return false;
pos += 4;
/* Save position for Pairwise Cipher Suite Count field */
countptr = to + pos;
pos += 2;
for (i = 0, count = 0; i < L_ARRAY_SIZE(pairwise_suites); i++) {
enum ie_rsn_cipher_suite suite = pairwise_suites[i];
if (!(info->pairwise_ciphers & suite))
continue;
if (!ie_build_cipher_suite(to + pos, microsoft_oui, suite))
return false;
pos += 4;
count += 1;
}
l_put_le16(count, countptr);
/* Save position for AKM Suite Count field */
countptr = to + pos;
pos += 2;
for (i = 0, count = 0; i < L_ARRAY_SIZE(akm_suites); i++) {
enum ie_rsn_akm_suite suite = akm_suites[i];
if (!(info->akm_suites & suite))
continue;
if (!ie_build_akm_suite(to + pos, microsoft_oui, suite))
return false;
pos += 4;
count += 1;
}
l_put_le16(count, countptr);
to[1] = pos - 2;
return true;
}

1
src/ie.h
View File

@ -269,3 +269,4 @@ int ie_parse_wpa(struct ie_tlv_iter *iter, struct ie_rsn_info *out_info);
int ie_parse_wpa_from_data(const uint8_t *data, size_t len,
struct ie_rsn_info *info);
bool is_ie_wpa_ie(const uint8_t *data, uint8_t len);
bool ie_build_wpa(const struct ie_rsn_info *info, uint8_t *to);